/*
  * Copyright (c) 2003 Fabrice Bellard
  *

  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or

  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either

  * version 2.1 of the License, or (at your option) any later version.

  *

  * FFmpeg is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public

  * License along with FFmpeg; if not, write to the Free Software

  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  */

 /**
  * @file
  * simple media player based on the FFmpeg libraries
  */
 

 #include "config.h"

 #include <inttypes.h>

 #include <math.h>
 #include <limits.h>

 #include <signal.h>

 #include <stdint.h>
 

 #include "libavutil/avstring.h"

 #include "libavutil/eval.h"

 #include "libavutil/mathematics.h"

 #include "libavutil/pixdesc.h"

 #include "libavutil/imgutils.h"

 #include "libavutil/dict.h"

 #include "libavutil/parseutils.h"
 #include "libavutil/samplefmt.h"

 #include "libavutil/avassert.h"

 #include "libavutil/time.h"

 #include "libavformat/avformat.h"
 #include "libavdevice/avdevice.h"
 #include "libswscale/swscale.h"

 #include "libavutil/opt.h"

 #include "libavcodec/avfft.h"

 #include "libswresample/swresample.h"

 #if CONFIG_AVFILTER

 # include "libavfilter/avcodec.h"

 # include "libavfilter/avfilter.h"

 # include "libavfilter/buffersink.h"

 # include "libavfilter/buffersrc.h"

 #endif
 

 #include <SDL.h>
 #include <SDL_thread.h>
 

 #include "cmdutils.h"

 #include <assert.h>
 

 const char program_name[] = "ffplay";

 const int program_birth_year = 2003;

 #define MAX_QUEUE_SIZE (15 * 1024 * 1024)

 #define MIN_FRAMES 25

 #define EXTERNAL_CLOCK_MIN_FRAMES 2
 #define EXTERNAL_CLOCK_MAX_FRAMES 10

 /* Minimum SDL audio buffer size, in samples. */

 #define SDL_AUDIO_MIN_BUFFER_SIZE 512
 /* Calculate actual buffer size keeping in mind not cause too frequent audio callbacks */

 #define SDL_AUDIO_MAX_CALLBACKS_PER_SEC 30

 /* no AV sync correction is done if below the minimum AV sync threshold */

 #define AV_SYNC_THRESHOLD_MIN 0.04

 /* AV sync correction is done if above the maximum AV sync threshold */
 #define AV_SYNC_THRESHOLD_MAX 0.1
 /* If a frame duration is longer than this, it will not be duplicated to compensate AV sync */
 #define AV_SYNC_FRAMEDUP_THRESHOLD 0.1

 /* no AV correction is done if too big error */
 #define AV_NOSYNC_THRESHOLD 10.0
 
 /* maximum audio speed change to get correct sync */
 #define SAMPLE_CORRECTION_PERCENT_MAX 10
 

 /* external clock speed adjustment constants for realtime sources based on buffer fullness */
 #define EXTERNAL_CLOCK_SPEED_MIN  0.900
 #define EXTERNAL_CLOCK_SPEED_MAX  1.010
 #define EXTERNAL_CLOCK_SPEED_STEP 0.001
 

 /* we use about AUDIO_DIFF_AVG_NB A-V differences to make the average */
 #define AUDIO_DIFF_AVG_NB   20
 

 /* polls for possible required screen refresh at least this often, should be less than 1/fps */
 #define REFRESH_RATE 0.01
 

 /* NOTE: the size must be big enough to compensate the hardware audio buffersize size */

 /* TODO: We assume that a decoded and resampled frame fits into this buffer */
 #define SAMPLE_ARRAY_SIZE (8 * 65536)

 #define CURSOR_HIDE_DELAY 1000000
 

 static unsigned sws_flags = SWS_BICUBIC;

 typedef struct MyAVPacketList {
     AVPacket pkt;
     struct MyAVPacketList *next;
     int serial;
 } MyAVPacketList;
 

 typedef struct PacketQueue {

     MyAVPacketList *first_pkt, *last_pkt;

     int nb_packets;
     int size;
     int abort_request;

     int serial;

     SDL_mutex *mutex;
     SDL_cond *cond;
 } PacketQueue;
 

 #define VIDEO_PICTURE_QUEUE_SIZE 3

 #define SUBPICTURE_QUEUE_SIZE 16

 #define SAMPLE_QUEUE_SIZE 9
 #define FRAME_QUEUE_SIZE FFMAX(SAMPLE_QUEUE_SIZE, FFMAX(VIDEO_PICTURE_QUEUE_SIZE, SUBPICTURE_QUEUE_SIZE))

 typedef struct AudioParams {
     int freq;
     int channels;

     int64_t channel_layout;

     enum AVSampleFormat fmt;

     int frame_size;
     int bytes_per_sec;

 } AudioParams;
 

 typedef struct Clock {
     double pts;           /* clock base */
     double pts_drift;     /* clock base minus time at which we updated the clock */
     double last_updated;
     double speed;
     int serial;           /* clock is based on a packet with this serial */
     int paused;
     int *queue_serial;    /* pointer to the current packet queue serial, used for obsolete clock detection */
 } Clock;
 

 /* Common struct for handling all types of decoded data and allocated render buffers. */
 typedef struct Frame {
     AVFrame *frame;
     AVSubtitle sub;
     int serial;
     double pts;           /* presentation timestamp for the frame */
     double duration;      /* estimated duration of the frame */
     int64_t pos;          /* byte position of the frame in the input file */
     SDL_Overlay *bmp;
     int allocated;
     int reallocate;
     int width;
     int height;
     AVRational sar;
 } Frame;
 
 typedef struct FrameQueue {
     Frame queue[FRAME_QUEUE_SIZE];
     int rindex;
     int windex;
     int size;
     int max_size;
     int keep_last;
     int rindex_shown;
     SDL_mutex *mutex;
     SDL_cond *cond;
     PacketQueue *pktq;
 } FrameQueue;
 

 enum {
     AV_SYNC_AUDIO_MASTER, /* default choice */
     AV_SYNC_VIDEO_MASTER,

     AV_SYNC_EXTERNAL_CLOCK, /* synchronize to an external clock */

 };
 

 typedef struct Decoder {
     AVPacket pkt;
     AVPacket pkt_temp;
     PacketQueue *queue;
     AVCodecContext *avctx;
     int pkt_serial;
     int finished;
     int packet_pending;
     SDL_cond *empty_queue_cond;

     int64_t start_pts;
     AVRational start_pts_tb;
     int64_t next_pts;
     AVRational next_pts_tb;

     SDL_Thread *decoder_tid;

 } Decoder;
 

 typedef struct VideoState {

     SDL_Thread *read_tid;

     AVInputFormat *iformat;

     int abort_request;

     int force_refresh;

     int paused;

     int last_paused;

     int queue_attachments_req;

     int seek_req;

     int seek_flags;

     int64_t seek_pos;

     int64_t seek_rel;

     int read_pause_return;

     AVFormatContext *ic;

     int realtime;

     Clock audclk;
     Clock vidclk;
     Clock extclk;
 

     FrameQueue pictq;
     FrameQueue subpq;

     FrameQueue sampq;

     Decoder auddec;
     Decoder viddec;
     Decoder subdec;
 

     int viddec_width;
     int viddec_height;
 

     int audio_stream;

     int av_sync_type;

     double audio_clock;

     int audio_clock_serial;

     double audio_diff_cum; /* used for AV difference average computation */
     double audio_diff_avg_coef;
     double audio_diff_threshold;
     int audio_diff_avg_count;

     AVStream *audio_st;
     PacketQueue audioq;
     int audio_hw_buf_size;

     uint8_t silence_buf[SDL_AUDIO_MIN_BUFFER_SIZE];

     uint8_t *audio_buf;

     uint8_t *audio_buf1;

     unsigned int audio_buf_size; /* in bytes */

     unsigned int audio_buf1_size;

     int audio_buf_index; /* in bytes */

     int audio_write_buf_size;

     struct AudioParams audio_src;

 #if CONFIG_AVFILTER
     struct AudioParams audio_filter_src;
 #endif

     struct AudioParams audio_tgt;

     struct SwrContext *swr_ctx;

     int frame_drops_early;
     int frame_drops_late;

     enum ShowMode {

         SHOW_MODE_NONE = -1, SHOW_MODE_VIDEO = 0, SHOW_MODE_WAVES, SHOW_MODE_RDFT, SHOW_MODE_NB

     } show_mode;

     int16_t sample_array[SAMPLE_ARRAY_SIZE];
     int sample_array_index;

     int last_i_start;

     RDFTContext *rdft;

     int rdft_bits;

     FFTSample *rdft_data;

     int xpos;

     double last_vis_time;

     int subtitle_stream;
     AVStream *subtitle_st;
     PacketQueue subtitleq;

     double frame_timer;

     double frame_last_returned_time;
     double frame_last_filter_delay;

     int video_stream;
     AVStream *video_st;
     PacketQueue videoq;

     double max_frame_duration;      // maximum duration of a frame - above this, we consider the jump a timestamp discontinuity

 #if !CONFIG_AVFILTER

     struct SwsContext *img_convert_ctx;

 #endif

     struct SwsContext *sub_convert_ctx;

     SDL_Rect last_display_rect;

     int eof;

     char filename[1024];
     int width, height, xleft, ytop;

     int step;

 #if CONFIG_AVFILTER

     int vfilter_idx;

     AVFilterContext *in_video_filter;   // the first filter in the video chain
     AVFilterContext *out_video_filter;  // the last filter in the video chain

     AVFilterContext *in_audio_filter;   // the first filter in the audio chain
     AVFilterContext *out_audio_filter;  // the last filter in the audio chain
     AVFilterGraph *agraph;              // audio filter graph

 #endif

     int last_video_stream, last_audio_stream, last_subtitle_stream;

 
     SDL_cond *continue_read_thread;

 } VideoState;
 
 /* options specified by the user */
 static AVInputFormat *file_iformat;
 static const char *input_filename;

 static const char *window_title;

 static int fs_screen_width;
 static int fs_screen_height;

 static int default_width  = 640;
 static int default_height = 480;

 static int screen_width  = 0;

 static int screen_height = 0;

 static int audio_disable;
 static int video_disable;

 static int subtitle_disable;

 static const char* wanted_stream_spec[AVMEDIA_TYPE_NB] = {0};

 static int seek_by_bytes = -1;

 static int display_disable;

 static int show_status = 1;

 static int av_sync_type = AV_SYNC_AUDIO_MASTER;

 static int64_t start_time = AV_NOPTS_VALUE;

 static int64_t duration = AV_NOPTS_VALUE;

 static int fast = 0;

 static int genpts = 0;

 static int lowres = 0;

 static int decoder_reorder_pts = -1;

 static int autoexit;

 static int exit_on_keydown;
 static int exit_on_mousedown;

 static int loop = 1;

 static int framedrop = -1;

 static int infinite_buffer = -1;

 static enum ShowMode show_mode = SHOW_MODE_NONE;

 static const char *audio_codec_name;
 static const char *subtitle_codec_name;
 static const char *video_codec_name;

 double rdftspeed = 0.02;

 static int64_t cursor_last_shown;
 static int cursor_hidden = 0;

 #if CONFIG_AVFILTER

 static const char **vfilters_list = NULL;
 static int nb_vfilters = 0;

 static char *afilters = NULL;

 #endif

 static int autorotate = 1;

 
 /* current context */
 static int is_full_screen;

 static int64_t audio_callback_time;

 static AVPacket flush_pkt;

 #define FF_ALLOC_EVENT   (SDL_USEREVENT)

 #define FF_QUIT_EVENT    (SDL_USEREVENT + 2)

 static SDL_Surface *screen;

 #if CONFIG_AVFILTER
 static int opt_add_vfilter(void *optctx, const char *opt, const char *arg)
 {
     GROW_ARRAY(vfilters_list, nb_vfilters);
     vfilters_list[nb_vfilters - 1] = arg;
     return 0;
 }
 #endif
 

 static inline
 int cmp_audio_fmts(enum AVSampleFormat fmt1, int64_t channel_count1,
                    enum AVSampleFormat fmt2, int64_t channel_count2)
 {
     /* If channel count == 1, planar and non-planar formats are the same */
     if (channel_count1 == 1 && channel_count2 == 1)
         return av_get_packed_sample_fmt(fmt1) != av_get_packed_sample_fmt(fmt2);
     else
         return channel_count1 != channel_count2 || fmt1 != fmt2;
 }
 
 static inline
 int64_t get_valid_channel_layout(int64_t channel_layout, int channels)
 {
     if (channel_layout && av_get_channel_layout_nb_channels(channel_layout) == channels)
         return channel_layout;
     else
         return 0;
 }
 

 static void free_picture(Frame *vp);
 

 static int packet_queue_put_private(PacketQueue *q, AVPacket *pkt)

 {

     MyAVPacketList *pkt1;

     if (q->abort_request)
        return -1;

     pkt1 = av_malloc(sizeof(MyAVPacketList));

     if (!pkt1)
         return -1;
     pkt1->pkt = *pkt;
     pkt1->next = NULL;

     if (pkt == &flush_pkt)
         q->serial++;
     pkt1->serial = q->serial;

 
     if (!q->last_pkt)
         q->first_pkt = pkt1;
     else
         q->last_pkt->next = pkt1;
     q->last_pkt = pkt1;
     q->nb_packets++;
     q->size += pkt1->pkt.size + sizeof(*pkt1);
     /* XXX: should duplicate packet data in DV case */
     SDL_CondSignal(q->cond);

     return 0;
 }
 
 static int packet_queue_put(PacketQueue *q, AVPacket *pkt)
 {
     int ret;

     /* duplicate the packet */
     if (pkt != &flush_pkt && av_dup_packet(pkt) < 0)
         return -1;
 
     SDL_LockMutex(q->mutex);
     ret = packet_queue_put_private(q, pkt);

     SDL_UnlockMutex(q->mutex);

 
     if (pkt != &flush_pkt && ret < 0)
         av_free_packet(pkt);
 
     return ret;

 }

 static int packet_queue_put_nullpacket(PacketQueue *q, int stream_index)
 {
     AVPacket pkt1, *pkt = &pkt1;
     av_init_packet(pkt);
     pkt->data = NULL;
     pkt->size = 0;
     pkt->stream_index = stream_index;
     return packet_queue_put(q, pkt);
 }
 

 /* packet queue handling */
 static void packet_queue_init(PacketQueue *q)
 {
     memset(q, 0, sizeof(PacketQueue));
     q->mutex = SDL_CreateMutex();
     q->cond = SDL_CreateCond();

     q->abort_request = 1;

 }
 

 static void packet_queue_flush(PacketQueue *q)

 {

     MyAVPacketList *pkt, *pkt1;

     SDL_LockMutex(q->mutex);

     for (pkt = q->first_pkt; pkt; pkt = pkt1) {

         pkt1 = pkt->next;
         av_free_packet(&pkt->pkt);

         av_freep(&pkt);

     }

     q->last_pkt = NULL;
     q->first_pkt = NULL;
     q->nb_packets = 0;
     q->size = 0;

     SDL_UnlockMutex(q->mutex);

 }
 

 static void packet_queue_destroy(PacketQueue *q)

 {
     packet_queue_flush(q);

     SDL_DestroyMutex(q->mutex);
     SDL_DestroyCond(q->cond);
 }
 
 static void packet_queue_abort(PacketQueue *q)
 {
     SDL_LockMutex(q->mutex);
 
     q->abort_request = 1;

     SDL_CondSignal(q->cond);
 
     SDL_UnlockMutex(q->mutex);
 }
 

 static void packet_queue_start(PacketQueue *q)
 {
     SDL_LockMutex(q->mutex);
     q->abort_request = 0;
     packet_queue_put_private(q, &flush_pkt);
     SDL_UnlockMutex(q->mutex);
 }
 

 /* return < 0 if aborted, 0 if no packet and > 0 if packet.  */

 static int packet_queue_get(PacketQueue *q, AVPacket *pkt, int block, int *serial)

 {

     MyAVPacketList *pkt1;

     int ret;
 
     SDL_LockMutex(q->mutex);
 

     for (;;) {

         if (q->abort_request) {
             ret = -1;
             break;
         }

         pkt1 = q->first_pkt;
         if (pkt1) {
             q->first_pkt = pkt1->next;
             if (!q->first_pkt)
                 q->last_pkt = NULL;
             q->nb_packets--;

             q->size -= pkt1->pkt.size + sizeof(*pkt1);

             *pkt = pkt1->pkt;

             if (serial)
                 *serial = pkt1->serial;

             av_free(pkt1);
             ret = 1;
             break;
         } else if (!block) {
             ret = 0;
             break;
         } else {
             SDL_CondWait(q->cond, q->mutex);
         }
     }
     SDL_UnlockMutex(q->mutex);
     return ret;
 }
 

 static void decoder_init(Decoder *d, AVCodecContext *avctx, PacketQueue *queue, SDL_cond *empty_queue_cond) {
     memset(d, 0, sizeof(Decoder));
     d->avctx = avctx;
     d->queue = queue;
     d->empty_queue_cond = empty_queue_cond;

     d->start_pts = AV_NOPTS_VALUE;

 }
 

 static int decoder_decode_frame(Decoder *d, AVFrame *frame, AVSubtitle *sub) {

     int got_frame = 0;
 
     do {
         int ret = -1;
 
         if (d->queue->abort_request)
             return -1;
 
         if (!d->packet_pending || d->queue->serial != d->pkt_serial) {
             AVPacket pkt;
             do {
                 if (d->queue->nb_packets == 0)
                     SDL_CondSignal(d->empty_queue_cond);
                 if (packet_queue_get(d->queue, &pkt, 1, &d->pkt_serial) < 0)
                     return -1;
                 if (pkt.data == flush_pkt.data) {
                     avcodec_flush_buffers(d->avctx);
                     d->finished = 0;

                     d->next_pts = d->start_pts;
                     d->next_pts_tb = d->start_pts_tb;

                 }
             } while (pkt.data == flush_pkt.data || d->queue->serial != d->pkt_serial);
             av_free_packet(&d->pkt);
             d->pkt_temp = d->pkt = pkt;
             d->packet_pending = 1;
         }
 
         switch (d->avctx->codec_type) {
             case AVMEDIA_TYPE_VIDEO:

                 ret = avcodec_decode_video2(d->avctx, frame, &got_frame, &d->pkt_temp);
                 if (got_frame) {
                     if (decoder_reorder_pts == -1) {
                         frame->pts = av_frame_get_best_effort_timestamp(frame);
                     } else if (decoder_reorder_pts) {
                         frame->pts = frame->pkt_pts;
                     } else {
                         frame->pts = frame->pkt_dts;
                     }
                 }

                 break;
             case AVMEDIA_TYPE_AUDIO:

                 ret = avcodec_decode_audio4(d->avctx, frame, &got_frame, &d->pkt_temp);
                 if (got_frame) {
                     AVRational tb = (AVRational){1, frame->sample_rate};
                     if (frame->pts != AV_NOPTS_VALUE)
                         frame->pts = av_rescale_q(frame->pts, d->avctx->time_base, tb);
                     else if (frame->pkt_pts != AV_NOPTS_VALUE)

                         frame->pts = av_rescale_q(frame->pkt_pts, av_codec_get_pkt_timebase(d->avctx), tb);

                     else if (d->next_pts != AV_NOPTS_VALUE)
                         frame->pts = av_rescale_q(d->next_pts, d->next_pts_tb, tb);
                     if (frame->pts != AV_NOPTS_VALUE) {
                         d->next_pts = frame->pts + frame->nb_samples;
                         d->next_pts_tb = tb;
                     }
                 }

                 break;
             case AVMEDIA_TYPE_SUBTITLE:

                 ret = avcodec_decode_subtitle2(d->avctx, sub, &got_frame, &d->pkt_temp);

                 break;
         }
 
         if (ret < 0) {
             d->packet_pending = 0;
         } else {
             d->pkt_temp.dts =
             d->pkt_temp.pts = AV_NOPTS_VALUE;
             if (d->pkt_temp.data) {
                 if (d->avctx->codec_type != AVMEDIA_TYPE_AUDIO)
                     ret = d->pkt_temp.size;
                 d->pkt_temp.data += ret;
                 d->pkt_temp.size -= ret;
                 if (d->pkt_temp.size <= 0)
                     d->packet_pending = 0;
             } else {
                 if (!got_frame) {
                     d->packet_pending = 0;
                     d->finished = d->pkt_serial;
                 }
             }
         }
     } while (!got_frame && !d->finished);
 
     return got_frame;
 }
 
 static void decoder_destroy(Decoder *d) {
     av_free_packet(&d->pkt);
 }
 

 static void frame_queue_unref_item(Frame *vp)
 {
     av_frame_unref(vp->frame);
     avsubtitle_free(&vp->sub);
 }
 
 static int frame_queue_init(FrameQueue *f, PacketQueue *pktq, int max_size, int keep_last)
 {
     int i;
     memset(f, 0, sizeof(FrameQueue));
     if (!(f->mutex = SDL_CreateMutex()))
         return AVERROR(ENOMEM);
     if (!(f->cond = SDL_CreateCond()))
         return AVERROR(ENOMEM);
     f->pktq = pktq;
     f->max_size = FFMIN(max_size, FRAME_QUEUE_SIZE);
     f->keep_last = !!keep_last;
     for (i = 0; i < f->max_size; i++)
         if (!(f->queue[i].frame = av_frame_alloc()))
             return AVERROR(ENOMEM);
     return 0;
 }
 
 static void frame_queue_destory(FrameQueue *f)
 {
     int i;
     for (i = 0; i < f->max_size; i++) {
         Frame *vp = &f->queue[i];
         frame_queue_unref_item(vp);
         av_frame_free(&vp->frame);
         free_picture(vp);
     }
     SDL_DestroyMutex(f->mutex);
     SDL_DestroyCond(f->cond);
 }
 
 static void frame_queue_signal(FrameQueue *f)
 {
     SDL_LockMutex(f->mutex);
     SDL_CondSignal(f->cond);
     SDL_UnlockMutex(f->mutex);
 }
 
 static Frame *frame_queue_peek(FrameQueue *f)
 {
     return &f->queue[(f->rindex + f->rindex_shown) % f->max_size];
 }
 
 static Frame *frame_queue_peek_next(FrameQueue *f)
 {
     return &f->queue[(f->rindex + f->rindex_shown + 1) % f->max_size];
 }
 
 static Frame *frame_queue_peek_last(FrameQueue *f)
 {
     return &f->queue[f->rindex];
 }
 
 static Frame *frame_queue_peek_writable(FrameQueue *f)
 {
     /* wait until we have space to put a new frame */
     SDL_LockMutex(f->mutex);
     while (f->size >= f->max_size &&
            !f->pktq->abort_request) {
         SDL_CondWait(f->cond, f->mutex);
     }
     SDL_UnlockMutex(f->mutex);
 
     if (f->pktq->abort_request)
         return NULL;
 
     return &f->queue[f->windex];
 }
 

 static Frame *frame_queue_peek_readable(FrameQueue *f)
 {
     /* wait until we have a readable a new frame */
     SDL_LockMutex(f->mutex);
     while (f->size - f->rindex_shown <= 0 &&
            !f->pktq->abort_request) {
         SDL_CondWait(f->cond, f->mutex);
     }
     SDL_UnlockMutex(f->mutex);
 
     if (f->pktq->abort_request)
         return NULL;
 
     return &f->queue[(f->rindex + f->rindex_shown) % f->max_size];
 }
 

 static void frame_queue_push(FrameQueue *f)
 {
     if (++f->windex == f->max_size)
         f->windex = 0;
     SDL_LockMutex(f->mutex);
     f->size++;

     SDL_CondSignal(f->cond);

     SDL_UnlockMutex(f->mutex);
 }
 
 static void frame_queue_next(FrameQueue *f)
 {
     if (f->keep_last && !f->rindex_shown) {
         f->rindex_shown = 1;
         return;
     }
     frame_queue_unref_item(&f->queue[f->rindex]);
     if (++f->rindex == f->max_size)
         f->rindex = 0;
     SDL_LockMutex(f->mutex);
     f->size--;
     SDL_CondSignal(f->cond);
     SDL_UnlockMutex(f->mutex);
 }
 
 /* jump back to the previous frame if available by resetting rindex_shown */
 static int frame_queue_prev(FrameQueue *f)
 {
     int ret = f->rindex_shown;
     f->rindex_shown = 0;
     return ret;
 }
 
 /* return the number of undisplayed frames in the queue */
 static int frame_queue_nb_remaining(FrameQueue *f)
 {
     return f->size - f->rindex_shown;
 }
 

 /* return last shown position */
 static int64_t frame_queue_last_pos(FrameQueue *f)
 {
     Frame *fp = &f->queue[f->rindex];
     if (f->rindex_shown && fp->serial == f->pktq->serial)
         return fp->pos;
     else
         return -1;
 }
 

 static void decoder_abort(Decoder *d, FrameQueue *fq)
 {
     packet_queue_abort(d->queue);
     frame_queue_signal(fq);
     SDL_WaitThread(d->decoder_tid, NULL);
     d->decoder_tid = NULL;
     packet_queue_flush(d->queue);
 }
 

 static inline void fill_rectangle(SDL_Surface *screen,

                                   int x, int y, int w, int h, int color, int update)

 {
     SDL_Rect rect;
     rect.x = x;
     rect.y = y;
     rect.w = w;
     rect.h = h;
     SDL_FillRect(screen, &rect, color);

     if (update && w > 0 && h > 0)
         SDL_UpdateRect(screen, x, y, w, h);

 }
 

 /* draw only the border of a rectangle */
 static void fill_border(int xleft, int ytop, int width, int height, int x, int y, int w, int h, int color, int update)
 {
     int w1, w2, h1, h2;
 
     /* fill the background */
     w1 = x;
     if (w1 < 0)
         w1 = 0;
     w2 = width - (x + w);
     if (w2 < 0)
         w2 = 0;
     h1 = y;
     if (h1 < 0)
         h1 = 0;
     h2 = height - (y + h);
     if (h2 < 0)
         h2 = 0;
     fill_rectangle(screen,
                    xleft, ytop,
                    w1, height,
                    color, update);
     fill_rectangle(screen,
                    xleft + width - w2, ytop,
                    w2, height,
                    color, update);
     fill_rectangle(screen,
                    xleft + w1, ytop,
                    width - w1 - w2, h1,
                    color, update);
     fill_rectangle(screen,
                    xleft + w1, ytop + height - h2,
                    width - w1 - w2, h2,
                    color, update);
 }
 

 #define ALPHA_BLEND(a, oldp, newp, s)\
 ((((oldp << s) * (255 - (a))) + (newp * (a))) / (255 << s))
 
 
 
 #define BPP 1
 

 static void blend_subrect(AVPicture *dst, const AVSubtitleRect *rect, int imgw, int imgh)

 {

     int x, y, Y, U, V, A;

     uint8_t *lum, *cb, *cr;

     int dstx, dsty, dstw, dsth;

     const AVPicture *src = &rect->pict;

     dstw = av_clip(rect->w, 0, imgw);
     dsth = av_clip(rect->h, 0, imgh);
     dstx = av_clip(rect->x, 0, imgw - dstw);
     dsty = av_clip(rect->y, 0, imgh - dsth);

     lum = dst->data[0] + dstx + dsty * dst->linesize[0];
     cb  = dst->data[1] + dstx/2 + (dsty >> 1) * dst->linesize[1];
     cr  = dst->data[2] + dstx/2 + (dsty >> 1) * dst->linesize[2];
 
     for (y = 0; y<dsth; y++) {
         for (x = 0; x<dstw; x++) {
             Y = src->data[0][x + y*src->linesize[0]];
             A = src->data[3][x + y*src->linesize[3]];
             lum[0] = ALPHA_BLEND(A, lum[0], Y, 0);

             lum++;
         }

         lum += dst->linesize[0] - dstw;

     }
 

     for (y = 0; y<dsth/2; y++) {
         for (x = 0; x<dstw/2; x++) {
             U = src->data[1][x + y*src->linesize[1]];
             V = src->data[2][x + y*src->linesize[2]];
             A = src->data[3][2*x     +  2*y   *src->linesize[3]]
               + src->data[3][2*x + 1 +  2*y   *src->linesize[3]]
               + src->data[3][2*x + 1 + (2*y+1)*src->linesize[3]]
               + src->data[3][2*x     + (2*y+1)*src->linesize[3]];
             cb[0] = ALPHA_BLEND(A>>2, cb[0], U, 0);
             cr[0] = ALPHA_BLEND(A>>2, cr[0], V, 0);

             cb++;
             cr++;
         }

         cb += dst->linesize[1] - dstw/2;
         cr += dst->linesize[2] - dstw/2;

     }
 }
 

 static void free_picture(Frame *vp)

 {
      if (vp->bmp) {
          SDL_FreeYUVOverlay(vp->bmp);
          vp->bmp = NULL;
      }
 }
 

 static void calculate_display_rect(SDL_Rect *rect,
                                    int scr_xleft, int scr_ytop, int scr_width, int scr_height,
                                    int pic_width, int pic_height, AVRational pic_sar)

 {
     float aspect_ratio;
     int width, height, x, y;
 

     if (pic_sar.num == 0)

         aspect_ratio = 0;
     else

         aspect_ratio = av_q2d(pic_sar);

 
     if (aspect_ratio <= 0.0)
         aspect_ratio = 1.0;

     aspect_ratio *= (float)pic_width / (float)pic_height;

 
     /* XXX: we suppose the screen has a 1.0 pixel ratio */
     height = scr_height;
     width = ((int)rint(height * aspect_ratio)) & ~1;
     if (width > scr_width) {
         width = scr_width;
         height = ((int)rint(width / aspect_ratio)) & ~1;
     }
     x = (scr_width - width) / 2;
     y = (scr_height - height) / 2;
     rect->x = scr_xleft + x;
     rect->y = scr_ytop  + y;
     rect->w = FFMAX(width,  1);
     rect->h = FFMAX(height, 1);
 }
 

 static void video_image_display(VideoState *is)
 {

     Frame *vp;
     Frame *sp;

     AVPicture pict;

     SDL_Rect rect;

     int i;

     vp = frame_queue_peek(&is->pictq);

     if (vp->bmp) {

         if (is->subtitle_st) {

             if (frame_queue_nb_remaining(&is->subpq) > 0) {
                 sp = frame_queue_peek(&is->subpq);

                 if (vp->pts >= sp->pts + ((float) sp->sub.start_display_time / 1000)) {

                     SDL_LockYUVOverlay (vp->bmp);
 
                     pict.data[0] = vp->bmp->pixels[0];
                     pict.data[1] = vp->bmp->pixels[2];
                     pict.data[2] = vp->bmp->pixels[1];
 
                     pict.linesize[0] = vp->bmp->pitches[0];
                     pict.linesize[1] = vp->bmp->pitches[2];
                     pict.linesize[2] = vp->bmp->pitches[1];
 
                     for (i = 0; i < sp->sub.num_rects; i++)

                         blend_subrect(&pict, sp->sub.rects[i],

                                       vp->bmp->w, vp->bmp->h);

 
                     SDL_UnlockYUVOverlay (vp->bmp);
                 }
             }
         }
 

         calculate_display_rect(&rect, is->xleft, is->ytop, is->width, is->height, vp->width, vp->height, vp->sar);

         SDL_DisplayYUVOverlay(vp->bmp, &rect);

 
         if (rect.x != is->last_display_rect.x || rect.y != is->last_display_rect.y || rect.w != is->last_display_rect.w || rect.h != is->last_display_rect.h || is->force_refresh) {
             int bgcolor = SDL_MapRGB(screen->format, 0x00, 0x00, 0x00);
             fill_border(is->xleft, is->ytop, is->width, is->height, rect.x, rect.y, rect.w, rect.h, bgcolor, 1);
             is->last_display_rect = rect;
         }

     }
 }
 
 static inline int compute_mod(int a, int b)
 {

     return a < 0 ? a%b + b : a%b;

 }
 
 static void video_audio_display(VideoState *s)
 {
     int i, i_start, x, y1, y, ys, delay, n, nb_display_channels;
     int ch, channels, h, h2, bgcolor, fgcolor;

     int64_t time_diff;

     int rdft_bits, nb_freq;
 

     for (rdft_bits = 1; (1 << rdft_bits) < 2 * s->height; rdft_bits++)

         ;

     nb_freq = 1 << (rdft_bits - 1);

     /* compute display index : center on currently output samples */

     channels = s->audio_tgt.channels;

     nb_display_channels = channels;

     if (!s->paused) {

         int data_used= s->show_mode == SHOW_MODE_WAVES ? s->width : (2*nb_freq);

         n = 2 * channels;

         delay = s->audio_write_buf_size;

         delay /= n;

         /* to be more precise, we take into account the time spent since
            the last buffer computation */
         if (audio_callback_time) {

             time_diff = av_gettime_relative() - audio_callback_time;

             delay -= (time_diff * s->audio_tgt.freq) / 1000000;

         }

         delay += 2 * data_used;

         if (delay < data_used)
             delay = data_used;

 
         i_start= x = compute_mod(s->sample_array_index - delay * channels, SAMPLE_ARRAY_SIZE);

         if (s->show_mode == SHOW_MODE_WAVES) {

             h = INT_MIN;
             for (i = 0; i < 1000; i += channels) {
                 int idx = (SAMPLE_ARRAY_SIZE + x - i) % SAMPLE_ARRAY_SIZE;
                 int a = s->sample_array[idx];
                 int b = s->sample_array[(idx + 4 * channels) % SAMPLE_ARRAY_SIZE];
                 int c = s->sample_array[(idx + 5 * channels) % SAMPLE_ARRAY_SIZE];
                 int d = s->sample_array[(idx + 9 * channels) % SAMPLE_ARRAY_SIZE];
                 int score = a - d;
                 if (h < score && (b ^ c) < 0) {
                     h = score;
                     i_start = idx;

                 }

             }
         }
 

         s->last_i_start = i_start;
     } else {
         i_start = s->last_i_start;

     }
 
     bgcolor = SDL_MapRGB(screen->format, 0x00, 0x00, 0x00);

     if (s->show_mode == SHOW_MODE_WAVES) {

         fill_rectangle(screen,
                        s->xleft, s->ytop, s->width, s->height,

                        bgcolor, 0);

 
         fgcolor = SDL_MapRGB(screen->format, 0xff, 0xff, 0xff);
 
         /* total height for one channel */
         h = s->height / nb_display_channels;
         /* graph height / 2 */
         h2 = (h * 9) / 20;

         for (ch = 0; ch < nb_display_channels; ch++) {

             i = i_start + ch;
             y1 = s->ytop + ch * h + (h / 2); /* position of center line */

             for (x = 0; x < s->width; x++) {

                 y = (s->sample_array[i] * h2) >> 15;
                 if (y < 0) {
                     y = -y;
                     ys = y1 - y;
                 } else {
                     ys = y1;
                 }
                 fill_rectangle(screen,
                                s->xleft + x, ys, 1, y,

                                fgcolor, 0);

                 i += channels;
                 if (i >= SAMPLE_ARRAY_SIZE)
                     i -= SAMPLE_ARRAY_SIZE;

             }
         }
 

         fgcolor = SDL_MapRGB(screen->format, 0x00, 0x00, 0xff);

         for (ch = 1; ch < nb_display_channels; ch++) {

             y = s->ytop + ch * h;
             fill_rectangle(screen,
                            s->xleft, y, s->width, 1,

                            fgcolor, 0);

         }
         SDL_UpdateRect(screen, s->xleft, s->ytop, s->width, s->height);

     } else {

         nb_display_channels= FFMIN(nb_display_channels, 2);

         if (rdft_bits != s->rdft_bits) {

             av_rdft_end(s->rdft);

             av_free(s->rdft_data);

             s->rdft = av_rdft_init(rdft_bits, DFT_R2C);

             s->rdft_bits = rdft_bits;

             s->rdft_data = av_malloc_array(nb_freq, 4 *sizeof(*s->rdft_data));

         }

         if (!s->rdft || !s->rdft_data){
             av_log(NULL, AV_LOG_ERROR, "Failed to allocate buffers for RDFT, switching to waves display\n");
             s->show_mode = SHOW_MODE_WAVES;
         } else {

             FFTSample *data[2];

             for (ch = 0; ch < nb_display_channels; ch++) {
                 data[ch] = s->rdft_data + 2 * nb_freq * ch;

                 i = i_start + ch;

                 for (x = 0; x < 2 * nb_freq; x++) {
                     double w = (x-nb_freq) * (1.0 / nb_freq);
                     data[ch][x] = s->sample_array[i] * (1.0 - w * w);

                     i += channels;
                     if (i >= SAMPLE_ARRAY_SIZE)
                         i -= SAMPLE_ARRAY_SIZE;
                 }

                 av_rdft_calc(s->rdft, data[ch]);

             }

             /* Least efficient way to do this, we should of course
              * directly access it but it is more than fast enough. */

             for (y = 0; y < s->height; y++) {
                 double w = 1 / sqrt(nb_freq);
                 int a = sqrt(w * sqrt(data[0][2 * y + 0] * data[0][2 * y + 0] + data[0][2 * y + 1] * data[0][2 * y + 1]));
                 int b = (nb_display_channels == 2 ) ? sqrt(w * sqrt(data[1][2 * y + 0] * data[1][2 * y + 0]
                        + data[1][2 * y + 1] * data[1][2 * y + 1])) : a;
                 a = FFMIN(a, 255);
                 b = FFMIN(b, 255);
                 fgcolor = SDL_MapRGB(screen->format, a, b, (a + b) / 2);

 
                 fill_rectangle(screen,
                             s->xpos, s->height-y, 1, 1,

                             fgcolor, 0);

             }
         }
         SDL_UpdateRect(screen, s->xpos, s->ytop, 1, s->height);

         if (!s->paused)
             s->xpos++;

         if (s->xpos >= s->width)

             s->xpos= s->xleft;
     }

 }
 

 static void stream_close(VideoState *is)
 {
     /* XXX: use a special url_shutdown call to abort parse cleanly */
     is->abort_request = 1;
     SDL_WaitThread(is->read_tid, NULL);

     packet_queue_destroy(&is->videoq);
     packet_queue_destroy(&is->audioq);
     packet_queue_destroy(&is->subtitleq);

 
     /* free all pictures */

     frame_queue_destory(&is->pictq);

     frame_queue_destory(&is->sampq);

     frame_queue_destory(&is->subpq);

     SDL_DestroyCond(is->continue_read_thread);

 #if !CONFIG_AVFILTER

     sws_freeContext(is->img_convert_ctx);

 #endif

     sws_freeContext(is->sub_convert_ctx);

     av_free(is);
 }
 

 static void do_exit(VideoState *is)

 {

     if (is) {
         stream_close(is);

     }

     av_lockmgr_register(NULL);

     uninit_opts();
 #if CONFIG_AVFILTER

     av_freep(&vfilters_list);

 #endif

     avformat_network_deinit();

     if (show_status)
         printf("\n");
     SDL_Quit();

     av_log(NULL, AV_LOG_QUIET, "%s", "");

     exit(0);
 }
 

 static void sigterm_handler(int sig)
 {
     exit(123);
 }
 

 static void set_default_window_size(int width, int height, AVRational sar)

 {
     SDL_Rect rect;

     calculate_display_rect(&rect, 0, 0, INT_MAX, height, width, height, sar);

     default_width  = rect.w;
     default_height = rect.h;
 }
 

 static int video_open(VideoState *is, int force_set_video_mode, Frame *vp)

 {
     int flags = SDL_HWSURFACE | SDL_ASYNCBLIT | SDL_HWACCEL;

     int w,h;
 

     if (is_full_screen) flags |= SDL_FULLSCREEN;
     else                flags |= SDL_RESIZABLE;

     if (vp && vp->width)

         set_default_window_size(vp->width, vp->height, vp->sar);

     if (is_full_screen && fs_screen_width) {
         w = fs_screen_width;
         h = fs_screen_height;

     } else if (!is_full_screen && screen_width) {

         w = screen_width;
         h = screen_height;

     } else {

         w = default_width;
         h = default_height;

     }

     w = FFMIN(16383, w);

     if (screen && is->width == screen->w && screen->w == w

        && is->height== screen->h && screen->h == h && !force_set_video_mode)

         return 0;

     screen = SDL_SetVideoMode(w, h, 0, flags);
     if (!screen) {

         av_log(NULL, AV_LOG_FATAL, "SDL: could not set video mode - exiting\n");

         do_exit(is);

     }

     if (!window_title)
         window_title = input_filename;
     SDL_WM_SetCaption(window_title, window_title);

     is->width  = screen->w;

     is->height = screen->h;
 
     return 0;
 }

 /* display the current picture, if any */
 static void video_display(VideoState *is)
 {

     if (!screen)

         video_open(is, 0, NULL);

     if (is->audio_st && is->show_mode != SHOW_MODE_VIDEO)

         video_audio_display(is);
     else if (is->video_st)
         video_image_display(is);
 }
 

 static double get_clock(Clock *c)

 {

     if (*c->queue_serial != c->serial)

         return NAN;

     if (c->paused) {
         return c->pts;

     } else {

         double time = av_gettime_relative() / 1000000.0;

         return c->pts_drift + time - (time - c->last_updated) * (1.0 - c->speed);

     }
 }
 

 static void set_clock_at(Clock *c, double pts, int serial, double time)

 {

     c->pts = pts;
     c->last_updated = time;
     c->pts_drift = c->pts - time;
     c->serial = serial;

 }
 

 static void set_clock(Clock *c, double pts, int serial)

 {

     double time = av_gettime_relative() / 1000000.0;

     set_clock_at(c, pts, serial, time);
 }
 
 static void set_clock_speed(Clock *c, double speed)
 {
     set_clock(c, get_clock(c), c->serial);
     c->speed = speed;
 }
 
 static void init_clock(Clock *c, int *queue_serial)
 {
     c->speed = 1.0;
     c->paused = 0;
     c->queue_serial = queue_serial;
     set_clock(c, NAN, -1);
 }
 
 static void sync_clock_to_slave(Clock *c, Clock *slave)
 {
     double clock = get_clock(c);
     double slave_clock = get_clock(slave);
     if (!isnan(slave_clock) && (isnan(clock) || fabs(clock - slave_clock) > AV_NOSYNC_THRESHOLD))
         set_clock(c, slave_clock, slave->serial);

 }
 

 static int get_master_sync_type(VideoState *is) {

     if (is->av_sync_type == AV_SYNC_VIDEO_MASTER) {
         if (is->video_st)

             return AV_SYNC_VIDEO_MASTER;

         else

             return AV_SYNC_AUDIO_MASTER;

     } else if (is->av_sync_type == AV_SYNC_AUDIO_MASTER) {
         if (is->audio_st)

             return AV_SYNC_AUDIO_MASTER;

         else

             return AV_SYNC_EXTERNAL_CLOCK;

     } else {

         return AV_SYNC_EXTERNAL_CLOCK;
     }
 }
 
 /* get the current master clock value */
 static double get_master_clock(VideoState *is)
 {
     double val;
 
     switch (get_master_sync_type(is)) {
         case AV_SYNC_VIDEO_MASTER:

             val = get_clock(&is->vidclk);

             break;
         case AV_SYNC_AUDIO_MASTER:

             val = get_clock(&is->audclk);

             break;
         default:

             val = get_clock(&is->extclk);

             break;

     }

     return val;
 }
 

 static void check_external_clock_speed(VideoState *is) {

    if (is->video_stream >= 0 && is->videoq.nb_packets <= EXTERNAL_CLOCK_MIN_FRAMES ||
        is->audio_stream >= 0 && is->audioq.nb_packets <= EXTERNAL_CLOCK_MIN_FRAMES) {

        set_clock_speed(&is->extclk, FFMAX(EXTERNAL_CLOCK_SPEED_MIN, is->extclk.speed - EXTERNAL_CLOCK_SPEED_STEP));

    } else if ((is->video_stream < 0 || is->videoq.nb_packets > EXTERNAL_CLOCK_MAX_FRAMES) &&
               (is->audio_stream < 0 || is->audioq.nb_packets > EXTERNAL_CLOCK_MAX_FRAMES)) {

        set_clock_speed(&is->extclk, FFMIN(EXTERNAL_CLOCK_SPEED_MAX, is->extclk.speed + EXTERNAL_CLOCK_SPEED_STEP));

    } else {

        double speed = is->extclk.speed;

        if (speed != 1.0)

            set_clock_speed(&is->extclk, speed + EXTERNAL_CLOCK_SPEED_STEP * (1.0 - speed) / fabs(1.0 - speed));

    }
 }
 

 /* seek in the stream */

 static void stream_seek(VideoState *is, int64_t pos, int64_t rel, int seek_by_bytes)

 {

     if (!is->seek_req) {
         is->seek_pos = pos;

         is->seek_rel = rel;

         is->seek_flags &= ~AVSEEK_FLAG_BYTE;

         if (seek_by_bytes)
             is->seek_flags |= AVSEEK_FLAG_BYTE;

         is->seek_req = 1;

         SDL_CondSignal(is->continue_read_thread);

     }

 }
 
 /* pause or resume the video */

 static void stream_toggle_pause(VideoState *is)

 {

     if (is->paused) {

         is->frame_timer += av_gettime_relative() / 1000000.0 - is->vidclk.last_updated;

         if (is->read_pause_return != AVERROR(ENOSYS)) {

             is->vidclk.paused = 0;

         }

         set_clock(&is->vidclk, get_clock(&is->vidclk), is->vidclk.serial);

     }

     set_clock(&is->extclk, get_clock(&is->extclk), is->extclk.serial);
     is->paused = is->audclk.paused = is->vidclk.paused = is->extclk.paused = !is->paused;

 }
 

 static void toggle_pause(VideoState *is)
 {
     stream_toggle_pause(is);
     is->step = 0;
 }
 
 static void step_to_next_frame(VideoState *is)
 {
     /* if the stream is paused unpause it, then step */
     if (is->paused)
         stream_toggle_pause(is);
     is->step = 1;
 }
 

 static double compute_target_delay(double delay, VideoState *is)

 {

     double sync_threshold, diff = 0;

 
     /* update delay to follow master synchronisation source */

     if (get_master_sync_type(is) != AV_SYNC_VIDEO_MASTER) {

         /* if video is slave, we try to correct big delays by
            duplicating or deleting a frame */

         diff = get_clock(&is->vidclk) - get_master_clock(is);

 
         /* skip or repeat frame. We take into account the
            delay to compute the threshold. I still don't know
            if it is the best guess */

         sync_threshold = FFMAX(AV_SYNC_THRESHOLD_MIN, FFMIN(AV_SYNC_THRESHOLD_MAX, delay));
         if (!isnan(diff) && fabs(diff) < is->max_frame_duration) {

             if (diff <= -sync_threshold)

                 delay = FFMAX(0, delay + diff);
             else if (diff >= sync_threshold && delay > AV_SYNC_FRAMEDUP_THRESHOLD)
                 delay = delay + diff;

             else if (diff >= sync_threshold)
                 delay = 2 * delay;
         }
     }

     av_log(NULL, AV_LOG_TRACE, "video: delay=%0.3f A-V=%f\n",

             delay, -diff);
 
     return delay;
 }
 

 static double vp_duration(VideoState *is, Frame *vp, Frame *nextvp) {

     if (vp->serial == nextvp->serial) {
         double duration = nextvp->pts - vp->pts;
         if (isnan(duration) || duration <= 0 || duration > is->max_frame_duration)
             return vp->duration;
         else
             return duration;
     } else {
         return 0.0;
     }
 }
 

 static void update_video_pts(VideoState *is, double pts, int64_t pos, int serial) {

     /* update current video pts */

     set_clock(&is->vidclk, pts, serial);
     sync_clock_to_slave(&is->extclk, &is->vidclk);

 }
 

 /* called to display each frame */

 static void video_refresh(void *opaque, double *remaining_time)

 {
     VideoState *is = opaque;

     double time;

     Frame *sp, *sp2;

     if (!is->paused && get_master_sync_type(is) == AV_SYNC_EXTERNAL_CLOCK && is->realtime)
         check_external_clock_speed(is);
 

     if (!display_disable && is->show_mode != SHOW_MODE_VIDEO && is->audio_st) {

         time = av_gettime_relative() / 1000000.0;

         if (is->force_refresh || is->last_vis_time + rdftspeed < time) {
             video_display(is);
             is->last_vis_time = time;
         }
         *remaining_time = FFMIN(*remaining_time, is->last_vis_time + rdftspeed - time);
     }

     if (is->video_st) {

         int redisplay = 0;

         if (is->force_refresh)

             redisplay = frame_queue_prev(&is->pictq);

 retry:

         if (frame_queue_nb_remaining(&is->pictq) == 0) {

             // nothing to do, no picture to display in the queue

         } else {

             double last_duration, duration, delay;

             Frame *vp, *lastvp;

             /* dequeue the picture */

             lastvp = frame_queue_peek_last(&is->pictq);
             vp = frame_queue_peek(&is->pictq);

             if (vp->serial != is->videoq.serial) {

                 frame_queue_next(&is->pictq);

                 redisplay = 0;

                 goto retry;
             }
 

             if (lastvp->serial != vp->serial && !redisplay)

                 is->frame_timer = av_gettime_relative() / 1000000.0;

             if (is->paused)
                 goto display;
 

             /* compute nominal last_duration */

             last_duration = vp_duration(is, lastvp, vp);

             if (redisplay)
                 delay = 0.0;
             else

                 delay = compute_target_delay(last_duration, is);

             time= av_gettime_relative()/1000000.0;

             if (time < is->frame_timer + delay && !redisplay) {

                 *remaining_time = FFMIN(is->frame_timer + delay - time, *remaining_time);

                 return;

             }

             is->frame_timer += delay;
             if (delay > 0 && time - is->frame_timer > AV_SYNC_THRESHOLD_MAX)
                 is->frame_timer = time;

             SDL_LockMutex(is->pictq.mutex);

             if (!redisplay && !isnan(vp->pts))

                 update_video_pts(is, vp->pts, vp->pos, vp->serial);

             SDL_UnlockMutex(is->pictq.mutex);

             if (frame_queue_nb_remaining(&is->pictq) > 1) {
                 Frame *nextvp = frame_queue_peek_next(&is->pictq);

                 duration = vp_duration(is, vp, nextvp);

                 if(!is->step && (redisplay || framedrop>0 || (framedrop && get_master_sync_type(is) != AV_SYNC_VIDEO_MASTER)) && time > is->frame_timer + duration){
                     if (!redisplay)
                         is->frame_drops_late++;

                     frame_queue_next(&is->pictq);

                     redisplay = 0;

                     goto retry;
                 }
             }

             if (is->subtitle_st) {

                     while (frame_queue_nb_remaining(&is->subpq) > 0) {
                         sp = frame_queue_peek(&is->subpq);

                         if (frame_queue_nb_remaining(&is->subpq) > 1)
                             sp2 = frame_queue_peek_next(&is->subpq);

                         else
                             sp2 = NULL;
 

                         if (sp->serial != is->subtitleq.serial
                                 || (is->vidclk.pts > (sp->pts + ((float) sp->sub.end_display_time / 1000)))

                                 || (sp2 && is->vidclk.pts > (sp2->pts + ((float) sp2->sub.start_display_time / 1000))))

                         {

                             frame_queue_next(&is->subpq);

                         } else {
                             break;

                         }
                     }
             }
 

 display:

             /* display picture */

             if (!display_disable && is->show_mode == SHOW_MODE_VIDEO)

                 video_display(is);

             frame_queue_next(&is->pictq);

 
             if (is->step && !is->paused)
                 stream_toggle_pause(is);

         }
     }

     is->force_refresh = 0;

     if (show_status) {
         static int64_t last_time;
         int64_t cur_time;

         int aqsize, vqsize, sqsize;

         double av_diff;

         cur_time = av_gettime_relative();

         if (!last_time || (cur_time - last_time) >= 30000) {

             aqsize = 0;
             vqsize = 0;

             sqsize = 0;

             if (is->audio_st)
                 aqsize = is->audioq.size;
             if (is->video_st)
                 vqsize = is->videoq.size;

             if (is->subtitle_st)
                 sqsize = is->subtitleq.size;

             av_diff = 0;
             if (is->audio_st && is->video_st)

                 av_diff = get_clock(&is->audclk) - get_clock(&is->vidclk);

             else if (is->video_st)
                 av_diff = get_master_clock(is) - get_clock(&is->vidclk);
             else if (is->audio_st)
                 av_diff = get_master_clock(is) - get_clock(&is->audclk);

             av_log(NULL, AV_LOG_INFO,
                    "%7.2f %s:%7.3f fd=%4d aq=%5dKB vq=%5dKB sq=%5dB f=%"PRId64"/%"PRId64"   \r",

                    get_master_clock(is),

                    (is->audio_st && is->video_st) ? "A-V" : (is->video_st ? "M-V" : (is->audio_st ? "M-A" : "   ")),

                    av_diff,

                    is->frame_drops_early + is->frame_drops_late,

                    aqsize / 1024,
                    vqsize / 1024,
                    sqsize,
                    is->video_st ? is->video_st->codec->pts_correction_num_faulty_dts : 0,
                    is->video_st ? is->video_st->codec->pts_correction_num_faulty_pts : 0);

             fflush(stdout);
             last_time = cur_time;
         }
     }
 }
 
 /* allocate a picture (needs to do that in main thread to avoid
    potential locking problems */

 static void alloc_picture(VideoState *is)

 {

     Frame *vp;

     int64_t bufferdiff;

     vp = &is->pictq.queue[is->pictq.windex];

     free_picture(vp);

     video_open(is, 0, vp);

     vp->bmp = SDL_CreateYUVOverlay(vp->width, vp->height,

                                    SDL_YV12_OVERLAY,

                                    screen);

     bufferdiff = vp->bmp ? FFMAX(vp->bmp->pixels[0], vp->bmp->pixels[1]) - FFMIN(vp->bmp->pixels[0], vp->bmp->pixels[1]) : 0;

     if (!vp->bmp || vp->bmp->pitches[0] < vp->width || bufferdiff < (int64_t)vp->height * vp->bmp->pitches[0]) {

         /* SDL allocates a buffer smaller than requested if the video
          * overlay hardware is unable to support the requested size. */

         av_log(NULL, AV_LOG_FATAL,
                "Error: the video system does not support an image\n"

                         "size of %dx%d pixels. Try using -lowres or -vf \"scale=w:h\"\n"

                         "to reduce the image size.\n", vp->width, vp->height );

         do_exit(is);

     }

     SDL_LockMutex(is->pictq.mutex);

     vp->allocated = 1;

     SDL_CondSignal(is->pictq.cond);
     SDL_UnlockMutex(is->pictq.mutex);

 }
 

 static void duplicate_right_border_pixels(SDL_Overlay *bmp) {
     int i, width, height;
     Uint8 *p, *maxp;
     for (i = 0; i < 3; i++) {
         width  = bmp->w;
         height = bmp->h;
         if (i > 0) {
             width  >>= 1;
             height >>= 1;
         }
         if (bmp->pitches[i] > width) {
             maxp = bmp->pixels[i] + bmp->pitches[i] * height - 1;
             for (p = bmp->pixels[i] + width - 1; p < maxp; p += bmp->pitches[i])
                 *(p+1) = *p;
         }
     }
 }
 

 static int queue_picture(VideoState *is, AVFrame *src_frame, double pts, double duration, int64_t pos, int serial)

 {

     Frame *vp;

 
 #if defined(DEBUG_SYNC) && 0

     printf("frame_type=%c pts=%0.3f\n",
            av_get_picture_type_char(src_frame->pict_type), pts);

 #endif

     if (!(vp = frame_queue_peek_writable(&is->pictq)))

         return -1;
 

     vp->sar = src_frame->sample_aspect_ratio;

     /* alloc or resize hardware picture buffer */

     if (!vp->bmp || vp->reallocate || !vp->allocated ||

         vp->width  != src_frame->width ||
         vp->height != src_frame->height) {

         SDL_Event event;
 

         vp->allocated  = 0;

         vp->reallocate = 0;

         vp->width = src_frame->width;
         vp->height = src_frame->height;

 
         /* the allocation must be done in the main thread to avoid

            locking problems. */

         event.type = FF_ALLOC_EVENT;

         event.user.data1 = is;

         SDL_PushEvent(&event);

         /* wait until the picture is allocated */

         SDL_LockMutex(is->pictq.mutex);

         while (!vp->allocated && !is->videoq.abort_request) {

             SDL_CondWait(is->pictq.cond, is->pictq.mutex);

         }

         /* if the queue is aborted, we have to pop the pending ALLOC event or wait for the allocation to complete */
         if (is->videoq.abort_request && SDL_PeepEvents(&event, 1, SDL_GETEVENT, SDL_EVENTMASK(FF_ALLOC_EVENT)) != 1) {

             while (!vp->allocated && !is->abort_request) {

                 SDL_CondWait(is->pictq.cond, is->pictq.mutex);

             }
         }

         SDL_UnlockMutex(is->pictq.mutex);

 
         if (is->videoq.abort_request)
             return -1;
     }
 

     /* if the frame is not skipped, then display it */

     if (vp->bmp) {

         AVPicture pict = { { 0 } };

         /* get a pointer on the bitmap */
         SDL_LockYUVOverlay (vp->bmp);
 
         pict.data[0] = vp->bmp->pixels[0];
         pict.data[1] = vp->bmp->pixels[2];
         pict.data[2] = vp->bmp->pixels[1];
 
         pict.linesize[0] = vp->bmp->pitches[0];
         pict.linesize[1] = vp->bmp->pitches[2];
         pict.linesize[2] = vp->bmp->pitches[1];

 
 #if CONFIG_AVFILTER

         // FIXME use direct rendering

         av_picture_copy(&pict, (AVPicture *)src_frame,

                         src_frame->format, vp->width, vp->height);

 #else

         {
             AVDictionaryEntry *e = av_dict_get(sws_dict, "sws_flags", NULL, 0);
             if (e) {
                 const AVClass *class = sws_get_class();
                 const AVOption    *o = av_opt_find(&class, "sws_flags", NULL, 0,
                                                    AV_OPT_SEARCH_FAKE_OBJ);
                 int ret = av_opt_eval_flags(&class, o, e->value, &sws_flags);
                 if (ret < 0)
                     exit(1);
             }
         }
 

         is->img_convert_ctx = sws_getCachedContext(is->img_convert_ctx,

             vp->width, vp->height, src_frame->format, vp->width, vp->height,

             AV_PIX_FMT_YUV420P, sws_flags, NULL, NULL, NULL);

         if (!is->img_convert_ctx) {

             av_log(NULL, AV_LOG_FATAL, "Cannot initialize the conversion context\n");

             exit(1);
         }

         sws_scale(is->img_convert_ctx, src_frame->data, src_frame->linesize,

                   0, vp->height, pict.data, pict.linesize);
 #endif

         /* workaround SDL PITCH_WORKAROUND */
         duplicate_right_border_pixels(vp->bmp);

         /* update the bitmap content */
         SDL_UnlockYUVOverlay(vp->bmp);
 

         vp->pts = pts;

         vp->duration = duration;

         vp->pos = pos;

         vp->serial = serial;

 
         /* now we can update the picture count */

         frame_queue_push(&is->pictq);

     }

     return 0;
 }
 

 static int get_video_frame(VideoState *is, AVFrame *frame)

 {

     int got_picture;

     if ((got_picture = decoder_decode_frame(&is->viddec, frame, NULL)) < 0)

         return -1;

     if (got_picture) {

         double dpts = NAN;

         if (frame->pts != AV_NOPTS_VALUE)
             dpts = av_q2d(is->video_st->time_base) * frame->pts;

         frame->sample_aspect_ratio = av_guess_sample_aspect_ratio(is->ic, is->video_st, frame);
 

         is->viddec_width  = frame->width;
         is->viddec_height = frame->height;
 

         if (framedrop>0 || (framedrop && get_master_sync_type(is) != AV_SYNC_VIDEO_MASTER)) {

             if (frame->pts != AV_NOPTS_VALUE) {
                 double diff = dpts - get_master_clock(is);
                 if (!isnan(diff) && fabs(diff) < AV_NOSYNC_THRESHOLD &&
                     diff - is->frame_last_filter_delay < 0 &&

                     is->viddec.pkt_serial == is->vidclk.serial &&

                     is->videoq.nb_packets) {

                     is->frame_drops_early++;

                     av_frame_unref(frame);

                     got_picture = 0;

                 }
             }
         }

     }

 
     return got_picture;

 }
 
 #if CONFIG_AVFILTER

 static int configure_filtergraph(AVFilterGraph *graph, const char *filtergraph,
                                  AVFilterContext *source_ctx, AVFilterContext *sink_ctx)
 {

     int ret, i;
     int nb_filters = graph->nb_filters;

     AVFilterInOut *outputs = NULL, *inputs = NULL;
 
     if (filtergraph) {
         outputs = avfilter_inout_alloc();
         inputs  = avfilter_inout_alloc();
         if (!outputs || !inputs) {
             ret = AVERROR(ENOMEM);
             goto fail;
         }
 
         outputs->name       = av_strdup("in");
         outputs->filter_ctx = source_ctx;
         outputs->pad_idx    = 0;
         outputs->next       = NULL;
 
         inputs->name        = av_strdup("out");
         inputs->filter_ctx  = sink_ctx;
         inputs->pad_idx     = 0;
         inputs->next        = NULL;
 

         if ((ret = avfilter_graph_parse_ptr(graph, filtergraph, &inputs, &outputs, NULL)) < 0)

             goto fail;
     } else {
         if ((ret = avfilter_link(source_ctx, 0, sink_ctx, 0)) < 0)
             goto fail;
     }
 

     /* Reorder the filters to ensure that inputs of the custom filters are merged first */
     for (i = 0; i < graph->nb_filters - nb_filters; i++)
         FFSWAP(AVFilterContext*, graph->filters[i], graph->filters[i + nb_filters]);
 

     ret = avfilter_graph_config(graph, NULL);

 fail:
     avfilter_inout_free(&outputs);
     avfilter_inout_free(&inputs);
     return ret;
 }
 

 static int configure_video_filters(AVFilterGraph *graph, VideoState *is, const char *vfilters, AVFrame *frame)

 {

     static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE };

     char sws_flags_str[512] = "";

     char buffersrc_args[256];

     int ret;

     AVFilterContext *filt_src = NULL, *filt_out = NULL, *last_filter = NULL;

     AVCodecContext *codec = is->video_st->codec;

     AVRational fr = av_guess_frame_rate(is->ic, is->video_st, NULL);

     AVDictionaryEntry *e = NULL;
 
     while ((e = av_dict_get(sws_dict, "", e, AV_DICT_IGNORE_SUFFIX))) {
         if (!strcmp(e->key, "sws_flags")) {
             av_strlcatf(sws_flags_str, sizeof(sws_flags_str), "%s=%s:", "flags", e->value);
         } else
             av_strlcatf(sws_flags_str, sizeof(sws_flags_str), "%s=%s:", e->key, e->value);
     }
     if (strlen(sws_flags_str))
         sws_flags_str[strlen(sws_flags_str)-1] = '\0';

     graph->scale_sws_opts = av_strdup(sws_flags_str);

     snprintf(buffersrc_args, sizeof(buffersrc_args),
              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d",

              frame->width, frame->height, frame->format,

              is->video_st->time_base.num, is->video_st->time_base.den,

              codec->sample_aspect_ratio.num, FFMAX(codec->sample_aspect_ratio.den, 1));

     if (fr.num && fr.den)
         av_strlcatf(buffersrc_args, sizeof(buffersrc_args), ":frame_rate=%d/%d", fr.num, fr.den);

 
     if ((ret = avfilter_graph_create_filter(&filt_src,
                                             avfilter_get_by_name("buffer"),

                                             "ffplay_buffer", buffersrc_args, NULL,

                                             graph)) < 0)

         goto fail;

     ret = avfilter_graph_create_filter(&filt_out,

                                        avfilter_get_by_name("buffersink"),

                                        "ffplay_buffersink", NULL, NULL, graph);

     if (ret < 0)

         goto fail;

     if ((ret = av_opt_set_int_list(filt_out, "pix_fmts", pix_fmts,  AV_PIX_FMT_NONE, AV_OPT_SEARCH_CHILDREN)) < 0)
         goto fail;
 

     last_filter = filt_out;
 
 /* Note: this macro adds a filter before the lastly added filter, so the
  * processing order of the filters is in reverse */

 #define INSERT_FILT(name, arg) do {                                          \
     AVFilterContext *filt_ctx;                                               \
                                                                              \
     ret = avfilter_graph_create_filter(&filt_ctx,                            \
                                        avfilter_get_by_name(name),           \
                                        "ffplay_" name, arg, NULL, graph);    \
     if (ret < 0)                                                             \
         goto fail;                                                           \
                                                                              \
     ret = avfilter_link(filt_ctx, 0, last_filter, 0);                        \
     if (ret < 0)                                                             \
         goto fail;                                                           \
                                                                              \
     last_filter = filt_ctx;                                                  \

 } while (0)
 

     /* SDL YUV code is not handling odd width/height for some driver
      * combinations, therefore we crop the picture to an even width/height. */

     INSERT_FILT("crop", "floor(in_w/2)*2:floor(in_h/2)*2");
 
     if (autorotate) {

         double theta  = get_rotation(is->video_st);

 
         if (fabs(theta - 90) < 1.0) {
             INSERT_FILT("transpose", "clock");
         } else if (fabs(theta - 180) < 1.0) {
             INSERT_FILT("hflip", NULL);
             INSERT_FILT("vflip", NULL);
         } else if (fabs(theta - 270) < 1.0) {
             INSERT_FILT("transpose", "cclock");
         } else if (fabs(theta) > 1.0) {
             char rotate_buf[64];
             snprintf(rotate_buf, sizeof(rotate_buf), "%f*PI/180", theta);
             INSERT_FILT("rotate", rotate_buf);

         }
     }

     if ((ret = configure_filtergraph(graph, vfilters, filt_src, last_filter)) < 0)

         goto fail;

     is->in_video_filter  = filt_src;

     is->out_video_filter = filt_out;

 fail:

     return ret;
 }
 

 static int configure_audio_filters(VideoState *is, const char *afilters, int force_output_format)
 {

     static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE };

     int sample_rates[2] = { 0, -1 };
     int64_t channel_layouts[2] = { 0, -1 };
     int channels[2] = { 0, -1 };
     AVFilterContext *filt_asrc = NULL, *filt_asink = NULL;

     char aresample_swr_opts[512] = "";
     AVDictionaryEntry *e = NULL;

     char asrc_args[256];
     int ret;
 
     avfilter_graph_free(&is->agraph);
     if (!(is->agraph = avfilter_graph_alloc()))
         return AVERROR(ENOMEM);
 

     while ((e = av_dict_get(swr_opts, "", e, AV_DICT_IGNORE_SUFFIX)))
         av_strlcatf(aresample_swr_opts, sizeof(aresample_swr_opts), "%s=%s:", e->key, e->value);
     if (strlen(aresample_swr_opts))
         aresample_swr_opts[strlen(aresample_swr_opts)-1] = '\0';
     av_opt_set(is->agraph, "aresample_swr_opts", aresample_swr_opts, 0);
 

     ret = snprintf(asrc_args, sizeof(asrc_args),

                    "sample_rate=%d:sample_fmt=%s:channels=%d:time_base=%d/%d",

                    is->audio_filter_src.freq, av_get_sample_fmt_name(is->audio_filter_src.fmt),

                    is->audio_filter_src.channels,
                    1, is->audio_filter_src.freq);

     if (is->audio_filter_src.channel_layout)
         snprintf(asrc_args + ret, sizeof(asrc_args) - ret,
                  ":channel_layout=0x%"PRIx64,  is->audio_filter_src.channel_layout);
 
     ret = avfilter_graph_create_filter(&filt_asrc,
                                        avfilter_get_by_name("abuffer"), "ffplay_abuffer",
                                        asrc_args, NULL, is->agraph);
     if (ret < 0)
         goto end;
 

 
     ret = avfilter_graph_create_filter(&filt_asink,
                                        avfilter_get_by_name("abuffersink"), "ffplay_abuffersink",
                                        NULL, NULL, is->agraph);
     if (ret < 0)
         goto end;
 
     if ((ret = av_opt_set_int_list(filt_asink, "sample_fmts", sample_fmts,  AV_SAMPLE_FMT_NONE, AV_OPT_SEARCH_CHILDREN)) < 0)
         goto end;
     if ((ret = av_opt_set_int(filt_asink, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)

         goto end;
 
     if (force_output_format) {
         channel_layouts[0] = is->audio_tgt.channel_layout;

         channels       [0] = is->audio_tgt.channels;
         sample_rates   [0] = is->audio_tgt.freq;
         if ((ret = av_opt_set_int(filt_asink, "all_channel_counts", 0, AV_OPT_SEARCH_CHILDREN)) < 0)
             goto end;
         if ((ret = av_opt_set_int_list(filt_asink, "channel_layouts", channel_layouts,  -1, AV_OPT_SEARCH_CHILDREN)) < 0)
             goto end;
         if ((ret = av_opt_set_int_list(filt_asink, "channel_counts" , channels       ,  -1, AV_OPT_SEARCH_CHILDREN)) < 0)
             goto end;
         if ((ret = av_opt_set_int_list(filt_asink, "sample_rates"   , sample_rates   ,  -1, AV_OPT_SEARCH_CHILDREN)) < 0)
             goto end;

     }
 
 
     if ((ret = configure_filtergraph(is->agraph, afilters, filt_asrc, filt_asink)) < 0)
         goto end;
 
     is->in_audio_filter  = filt_asrc;
     is->out_audio_filter = filt_asink;
 
 end:
     if (ret < 0)
         avfilter_graph_free(&is->agraph);
     return ret;
 }

 #endif  /* CONFIG_AVFILTER */
 

 static int audio_thread(void *arg)
 {
     VideoState *is = arg;
     AVFrame *frame = av_frame_alloc();
     Frame *af;
 #if CONFIG_AVFILTER
     int last_serial = -1;
     int64_t dec_channel_layout;
     int reconfigure;
 #endif
     int got_frame = 0;
     AVRational tb;
     int ret = 0;
 
     if (!frame)
         return AVERROR(ENOMEM);
 
     do {
         if ((got_frame = decoder_decode_frame(&is->auddec, frame, NULL)) < 0)
             goto the_end;
 
         if (got_frame) {
                 tb = (AVRational){1, frame->sample_rate};
 
 #if CONFIG_AVFILTER
                 dec_channel_layout = get_valid_channel_layout(frame->channel_layout, av_frame_get_channels(frame));
 
                 reconfigure =
                     cmp_audio_fmts(is->audio_filter_src.fmt, is->audio_filter_src.channels,
                                    frame->format, av_frame_get_channels(frame))    ||
                     is->audio_filter_src.channel_layout != dec_channel_layout ||
                     is->audio_filter_src.freq           != frame->sample_rate ||
                     is->auddec.pkt_serial               != last_serial;
 
                 if (reconfigure) {
                     char buf1[1024], buf2[1024];
                     av_get_channel_layout_string(buf1, sizeof(buf1), -1, is->audio_filter_src.channel_layout);
                     av_get_channel_layout_string(buf2, sizeof(buf2), -1, dec_channel_layout);
                     av_log(NULL, AV_LOG_DEBUG,
                            "Audio frame changed from rate:%d ch:%d fmt:%s layout:%s serial:%d to rate:%d ch:%d fmt:%s layout:%s serial:%d\n",
                            is->audio_filter_src.freq, is->audio_filter_src.channels, av_get_sample_fmt_name(is->audio_filter_src.fmt), buf1, last_serial,
                            frame->sample_rate, av_frame_get_channels(frame), av_get_sample_fmt_name(frame->format), buf2, is->auddec.pkt_serial);
 
                     is->audio_filter_src.fmt            = frame->format;
                     is->audio_filter_src.channels       = av_frame_get_channels(frame);
                     is->audio_filter_src.channel_layout = dec_channel_layout;
                     is->audio_filter_src.freq           = frame->sample_rate;
                     last_serial                         = is->auddec.pkt_serial;
 
                     if ((ret = configure_audio_filters(is, afilters, 1)) < 0)
                         goto the_end;
                 }
 
             if ((ret = av_buffersrc_add_frame(is->in_audio_filter, frame)) < 0)
                 goto the_end;
 
             while ((ret = av_buffersink_get_frame_flags(is->out_audio_filter, frame, 0)) >= 0) {
                 tb = is->out_audio_filter->inputs[0]->time_base;
 #endif
                 if (!(af = frame_queue_peek_writable(&is->sampq)))
                     goto the_end;
 
                 af->pts = (frame->pts == AV_NOPTS_VALUE) ? NAN : frame->pts * av_q2d(tb);
                 af->pos = av_frame_get_pkt_pos(frame);
                 af->serial = is->auddec.pkt_serial;
                 af->duration = av_q2d((AVRational){frame->nb_samples, frame->sample_rate});
 
                 av_frame_move_ref(af->frame, frame);
                 frame_queue_push(&is->sampq);
 
 #if CONFIG_AVFILTER
                 if (is->audioq.serial != is->auddec.pkt_serial)
                     break;
             }
             if (ret == AVERROR_EOF)
                 is->auddec.finished = is->auddec.pkt_serial;
 #endif
         }
     } while (ret >= 0 || ret == AVERROR(EAGAIN) || ret == AVERROR_EOF);
  the_end:
 #if CONFIG_AVFILTER
     avfilter_graph_free(&is->agraph);
 #endif
     av_frame_free(&frame);
     return ret;
 }
 

 static void decoder_start(Decoder *d, int (*fn)(void *), void *arg)
 {
     packet_queue_start(d->queue);
     d->decoder_tid = SDL_CreateThread(fn, arg);
 }
 

 static int video_thread(void *arg)
 {
     VideoState *is = arg;

     AVFrame *frame = av_frame_alloc();

     double pts;

     double duration;

     int ret;

     AVRational tb = is->video_st->time_base;

     AVRational frame_rate = av_guess_frame_rate(is->ic, is->video_st, NULL);

 
 #if CONFIG_AVFILTER
     AVFilterGraph *graph = avfilter_graph_alloc();

     AVFilterContext *filt_out = NULL, *filt_in = NULL;

     int last_w = 0;
     int last_h = 0;

     enum AVPixelFormat last_format = -2;

     int last_serial = -1;

     int last_vfilter_idx = 0;

     if (!graph) {
         av_frame_free(&frame);

         return AVERROR(ENOMEM);

     }

 #endif
 

     if (!frame) {
 #if CONFIG_AVFILTER
         avfilter_graph_free(&graph);
 #endif

         return AVERROR(ENOMEM);

     }

     for (;;) {

         ret = get_video_frame(is, frame);

         if (ret < 0)
             goto the_end;
         if (!ret)
             continue;
 

 #if CONFIG_AVFILTER

         if (   last_w != frame->width
             || last_h != frame->height

             || last_format != frame->format

             || last_serial != is->viddec.pkt_serial

             || last_vfilter_idx != is->vfilter_idx) {

             av_log(NULL, AV_LOG_DEBUG,

                    "Video frame changed from size:%dx%d format:%s serial:%d to size:%dx%d format:%s serial:%d\n",
                    last_w, last_h,
                    (const char *)av_x_if_null(av_get_pix_fmt_name(last_format), "none"), last_serial,
                    frame->width, frame->height,

                    (const char *)av_x_if_null(av_get_pix_fmt_name(frame->format), "none"), is->viddec.pkt_serial);

             avfilter_graph_free(&graph);
             graph = avfilter_graph_alloc();

             if ((ret = configure_video_filters(graph, is, vfilters_list ? vfilters_list[is->vfilter_idx] : NULL, frame)) < 0) {

                 SDL_Event event;
                 event.type = FF_QUIT_EVENT;
                 event.user.data1 = is;
                 SDL_PushEvent(&event);

                 goto the_end;

             }

             filt_in  = is->in_video_filter;

             filt_out = is->out_video_filter;

             last_w = frame->width;
             last_h = frame->height;
             last_format = frame->format;

             last_serial = is->viddec.pkt_serial;

             last_vfilter_idx = is->vfilter_idx;

             frame_rate = filt_out->inputs[0]->frame_rate;

         }

         ret = av_buffersrc_add_frame(filt_in, frame);
         if (ret < 0)
             goto the_end;

         while (ret >= 0) {

             is->frame_last_returned_time = av_gettime_relative() / 1000000.0;

             ret = av_buffersink_get_frame_flags(filt_out, frame, 0);

             if (ret < 0) {

                 if (ret == AVERROR_EOF)

                     is->viddec.finished = is->viddec.pkt_serial;

                 ret = 0;
                 break;
             }
 

             is->frame_last_filter_delay = av_gettime_relative() / 1000000.0 - is->frame_last_returned_time;

             if (fabs(is->frame_last_filter_delay) > AV_NOSYNC_THRESHOLD / 10.0)
                 is->frame_last_filter_delay = 0;

             tb = filt_out->inputs[0]->time_base;
 #endif

             duration = (frame_rate.num && frame_rate.den ? av_q2d((AVRational){frame_rate.den, frame_rate.num}) : 0);

             pts = (frame->pts == AV_NOPTS_VALUE) ? NAN : frame->pts * av_q2d(tb);

             ret = queue_picture(is, frame, pts, duration, av_frame_get_pkt_pos(frame), is->viddec.pkt_serial);

             av_frame_unref(frame);

 #if CONFIG_AVFILTER

         }

 #endif

         if (ret < 0)
             goto the_end;

     }
  the_end:

 #if CONFIG_AVFILTER

     avfilter_graph_free(&graph);

 #endif

     av_frame_free(&frame);

     return 0;
 }
 

 static int subtitle_thread(void *arg)
 {
     VideoState *is = arg;

     Frame *sp;

     int got_subtitle;

     double pts;

     int i;

     for (;;) {

         if (!(sp = frame_queue_peek_writable(&is->subpq)))

             return 0;

         if ((got_subtitle = decoder_decode_frame(&is->subdec, NULL, &sp->sub)) < 0)

             break;
 

         pts = 0;
 
         if (got_subtitle && sp->sub.format == 0) {

             if (sp->sub.pts != AV_NOPTS_VALUE)
                 pts = sp->sub.pts / (double)AV_TIME_BASE;

             sp->pts = pts;

             sp->serial = is->subdec.pkt_serial;

             for (i = 0; i < sp->sub.num_rects; i++)
             {

                 int in_w = sp->sub.rects[i]->w;
                 int in_h = sp->sub.rects[i]->h;
                 int subw = is->subdec.avctx->width  ? is->subdec.avctx->width  : is->viddec_width;
                 int subh = is->subdec.avctx->height ? is->subdec.avctx->height : is->viddec_height;
                 int out_w = is->viddec_width  ? in_w * is->viddec_width  / subw : in_w;
                 int out_h = is->viddec_height ? in_h * is->viddec_height / subh : in_h;
                 AVPicture newpic;
 
                 //can not use avpicture_alloc as it is not compatible with avsubtitle_free()
                 av_image_fill_linesizes(newpic.linesize, AV_PIX_FMT_YUVA420P, out_w);
                 newpic.data[0] = av_malloc(newpic.linesize[0] * out_h);
                 newpic.data[3] = av_malloc(newpic.linesize[3] * out_h);
                 newpic.data[1] = av_malloc(newpic.linesize[1] * ((out_h+1)/2));
                 newpic.data[2] = av_malloc(newpic.linesize[2] * ((out_h+1)/2));
 
                 is->sub_convert_ctx = sws_getCachedContext(is->sub_convert_ctx,
                     in_w, in_h, AV_PIX_FMT_PAL8, out_w, out_h,
                     AV_PIX_FMT_YUVA420P, sws_flags, NULL, NULL, NULL);
                 if (!is->sub_convert_ctx || !newpic.data[0] || !newpic.data[3] ||
                     !newpic.data[1] || !newpic.data[2]
                 ) {
                     av_log(NULL, AV_LOG_FATAL, "Cannot initialize the sub conversion context\n");
                     exit(1);

                 }

                 sws_scale(is->sub_convert_ctx,
                           (void*)sp->sub.rects[i]->pict.data, sp->sub.rects[i]->pict.linesize,
                           0, in_h, newpic.data, newpic.linesize);
 
                 av_free(sp->sub.rects[i]->pict.data[0]);
                 av_free(sp->sub.rects[i]->pict.data[1]);
                 sp->sub.rects[i]->pict = newpic;
                 sp->sub.rects[i]->w = out_w;
                 sp->sub.rects[i]->h = out_h;
                 sp->sub.rects[i]->x = sp->sub.rects[i]->x * out_w / in_w;
                 sp->sub.rects[i]->y = sp->sub.rects[i]->y * out_h / in_h;

             }
 
             /* now we can update the picture count */

             frame_queue_push(&is->subpq);

         } else if (got_subtitle) {
             avsubtitle_free(&sp->sub);

         }
     }
     return 0;
 }
 

 /* copy samples for viewing in editor window */
 static void update_sample_display(VideoState *is, short *samples, int samples_size)
 {

     int size, len;

 
     size = samples_size / sizeof(short);
     while (size > 0) {
         len = SAMPLE_ARRAY_SIZE - is->sample_array_index;
         if (len > size)
             len = size;
         memcpy(is->sample_array + is->sample_array_index, samples, len * sizeof(short));
         samples += len;
         is->sample_array_index += len;
         if (is->sample_array_index >= SAMPLE_ARRAY_SIZE)
             is->sample_array_index = 0;
         size -= len;
     }
 }
 

 /* return the wanted number of samples to get better sync if sync_type is video
  * or external master clock */
 static int synchronize_audio(VideoState *is, int nb_samples)

 {

     int wanted_nb_samples = nb_samples;

 
     /* if not master, then we try to remove or add samples to correct the clock */

     if (get_master_sync_type(is) != AV_SYNC_AUDIO_MASTER) {

         double diff, avg_diff;

         int min_nb_samples, max_nb_samples;

         diff = get_clock(&is->audclk) - get_master_clock(is);

         if (!isnan(diff) && fabs(diff) < AV_NOSYNC_THRESHOLD) {

             is->audio_diff_cum = diff + is->audio_diff_avg_coef * is->audio_diff_cum;
             if (is->audio_diff_avg_count < AUDIO_DIFF_AVG_NB) {
                 /* not enough measures to have a correct estimate */
                 is->audio_diff_avg_count++;
             } else {
                 /* estimate the A-V difference */
                 avg_diff = is->audio_diff_cum * (1.0 - is->audio_diff_avg_coef);
 
                 if (fabs(avg_diff) >= is->audio_diff_threshold) {

                     wanted_nb_samples = nb_samples + (int)(diff * is->audio_src.freq);

                     min_nb_samples = ((nb_samples * (100 - SAMPLE_CORRECTION_PERCENT_MAX) / 100));
                     max_nb_samples = ((nb_samples * (100 + SAMPLE_CORRECTION_PERCENT_MAX) / 100));

                     wanted_nb_samples = av_clip(wanted_nb_samples, min_nb_samples, max_nb_samples);

                 }

                 av_log(NULL, AV_LOG_TRACE, "diff=%f adiff=%f sample_diff=%d apts=%0.3f %f\n",

                         diff, avg_diff, wanted_nb_samples - nb_samples,

                         is->audio_clock, is->audio_diff_threshold);

             }

         } else {
             /* too big difference : may be initial PTS errors, so
                reset A-V filter */
             is->audio_diff_avg_count = 0;

             is->audio_diff_cum       = 0;

         }
     }
 

     return wanted_nb_samples;

 }
 

 /**
  * Decode one audio frame and return its uncompressed size.
  *
  * The processed audio frame is decoded, converted if required, and
  * stored in is->audio_buf, with size in bytes given by the return
  * value.
  */

 static int audio_decode_frame(VideoState *is)

 {

     int data_size, resampled_data_size;

     int64_t dec_channel_layout;

     av_unused double audio_clock0;

     int wanted_nb_samples;

     Frame *af;

     if (is->paused)
         return -1;
 
     do {

 #if defined(_WIN32)
         while (frame_queue_nb_remaining(&is->sampq) == 0) {
             if ((av_gettime_relative() - audio_callback_time) > 1000000LL * is->audio_hw_buf_size / is->audio_tgt.bytes_per_sec / 2)
                 return -1;
             av_usleep (1000);
         }
 #endif

         if (!(af = frame_queue_peek_readable(&is->sampq)))
             return -1;
         frame_queue_next(&is->sampq);
     } while (af->serial != is->audioq.serial);
 
     data_size = av_samples_get_buffer_size(NULL, av_frame_get_channels(af->frame),
                                            af->frame->nb_samples,
                                            af->frame->format, 1);
 
     dec_channel_layout =
         (af->frame->channel_layout && av_frame_get_channels(af->frame) == av_get_channel_layout_nb_channels(af->frame->channel_layout)) ?
         af->frame->channel_layout : av_get_default_channel_layout(av_frame_get_channels(af->frame));
     wanted_nb_samples = synchronize_audio(is, af->frame->nb_samples);
 
     if (af->frame->format        != is->audio_src.fmt            ||
         dec_channel_layout       != is->audio_src.channel_layout ||
         af->frame->sample_rate   != is->audio_src.freq           ||
         (wanted_nb_samples       != af->frame->nb_samples && !is->swr_ctx)) {
         swr_free(&is->swr_ctx);
         is->swr_ctx = swr_alloc_set_opts(NULL,
                                          is->audio_tgt.channel_layout, is->audio_tgt.fmt, is->audio_tgt.freq,
                                          dec_channel_layout,           af->frame->format, af->frame->sample_rate,
                                          0, NULL);
         if (!is->swr_ctx || swr_init(is->swr_ctx) < 0) {
             av_log(NULL, AV_LOG_ERROR,
                    "Cannot create sample rate converter for conversion of %d Hz %s %d channels to %d Hz %s %d channels!\n",
                     af->frame->sample_rate, av_get_sample_fmt_name(af->frame->format), av_frame_get_channels(af->frame),
                     is->audio_tgt.freq, av_get_sample_fmt_name(is->audio_tgt.fmt), is->audio_tgt.channels);
             swr_free(&is->swr_ctx);

             return -1;

         }
         is->audio_src.channel_layout = dec_channel_layout;
         is->audio_src.channels       = av_frame_get_channels(af->frame);
         is->audio_src.freq = af->frame->sample_rate;
         is->audio_src.fmt = af->frame->format;
     }

     if (is->swr_ctx) {
         const uint8_t **in = (const uint8_t **)af->frame->extended_data;
         uint8_t **out = &is->audio_buf1;
         int out_count = (int64_t)wanted_nb_samples * is->audio_tgt.freq / af->frame->sample_rate + 256;
         int out_size  = av_samples_get_buffer_size(NULL, is->audio_tgt.channels, out_count, is->audio_tgt.fmt, 0);
         int len2;
         if (out_size < 0) {
             av_log(NULL, AV_LOG_ERROR, "av_samples_get_buffer_size() failed\n");
             return -1;
         }
         if (wanted_nb_samples != af->frame->nb_samples) {
             if (swr_set_compensation(is->swr_ctx, (wanted_nb_samples - af->frame->nb_samples) * is->audio_tgt.freq / af->frame->sample_rate,
                                         wanted_nb_samples * is->audio_tgt.freq / af->frame->sample_rate) < 0) {
                 av_log(NULL, AV_LOG_ERROR, "swr_set_compensation() failed\n");

                 return -1;

             }

         }
         av_fast_malloc(&is->audio_buf1, &is->audio_buf1_size, out_size);
         if (!is->audio_buf1)
             return AVERROR(ENOMEM);
         len2 = swr_convert(is->swr_ctx, out, out_count, in, af->frame->nb_samples);
         if (len2 < 0) {
             av_log(NULL, AV_LOG_ERROR, "swr_convert() failed\n");
             return -1;
         }
         if (len2 == out_count) {
             av_log(NULL, AV_LOG_WARNING, "audio buffer is probably too small\n");
             if (swr_init(is->swr_ctx) < 0)
                 swr_free(&is->swr_ctx);
         }
         is->audio_buf = is->audio_buf1;
         resampled_data_size = len2 * is->audio_tgt.channels * av_get_bytes_per_sample(is->audio_tgt.fmt);
     } else {
         is->audio_buf = af->frame->data[0];
         resampled_data_size = data_size;
     }

     audio_clock0 = is->audio_clock;
     /* update the audio clock with the pts */
     if (!isnan(af->pts))
         is->audio_clock = af->pts + (double) af->frame->nb_samples / af->frame->sample_rate;
     else
         is->audio_clock = NAN;
     is->audio_clock_serial = af->serial;

 #ifdef DEBUG

     {
         static double last_clock;
         printf("audio: delay=%0.3f clock=%0.3f clock0=%0.3f\n",
                is->audio_clock - last_clock,
                is->audio_clock, audio_clock0);
         last_clock = is->audio_clock;

     }

 #endif
     return resampled_data_size;

 }
 
 /* prepare a new audio buffer */

 static void sdl_audio_callback(void *opaque, Uint8 *stream, int len)

 {
     VideoState *is = opaque;
     int audio_size, len1;
 

     audio_callback_time = av_gettime_relative();

     while (len > 0) {
         if (is->audio_buf_index >= is->audio_buf_size) {

            audio_size = audio_decode_frame(is);

            if (audio_size < 0) {
                 /* if error, just output silence */

                is->audio_buf      = is->silence_buf;

                is->audio_buf_size = sizeof(is->silence_buf) / is->audio_tgt.frame_size * is->audio_tgt.frame_size;

            } else {

                if (is->show_mode != SHOW_MODE_VIDEO)

                    update_sample_display(is, (int16_t *)is->audio_buf, audio_size);
                is->audio_buf_size = audio_size;
            }
            is->audio_buf_index = 0;
         }
         len1 = is->audio_buf_size - is->audio_buf_index;
         if (len1 > len)
             len1 = len;
         memcpy(stream, (uint8_t *)is->audio_buf + is->audio_buf_index, len1);
         len -= len1;
         stream += len1;
         is->audio_buf_index += len1;
     }

     is->audio_write_buf_size = is->audio_buf_size - is->audio_buf_index;
     /* Let's assume the audio driver that is used by SDL has two periods. */

     if (!isnan(is->audio_clock)) {

         set_clock_at(&is->audclk, is->audio_clock - (double)(2 * is->audio_hw_buf_size + is->audio_write_buf_size) / is->audio_tgt.bytes_per_sec, is->audio_clock_serial, audio_callback_time / 1000000.0);

         sync_clock_to_slave(&is->extclk, &is->audclk);
     }

 }
 

 static int audio_open(void *opaque, int64_t wanted_channel_layout, int wanted_nb_channels, int wanted_sample_rate, struct AudioParams *audio_hw_params)

 {
     SDL_AudioSpec wanted_spec, spec;
     const char *env;

     static const int next_nb_channels[] = {0, 0, 1, 6, 2, 6, 4, 6};

     static const int next_sample_rates[] = {0, 44100, 48000, 96000, 192000};
     int next_sample_rate_idx = FF_ARRAY_ELEMS(next_sample_rates) - 1;

 
     env = SDL_getenv("SDL_AUDIO_CHANNELS");

     if (env) {

         wanted_nb_channels = atoi(env);

         wanted_channel_layout = av_get_default_channel_layout(wanted_nb_channels);
     }
     if (!wanted_channel_layout || wanted_nb_channels != av_get_channel_layout_nb_channels(wanted_channel_layout)) {
         wanted_channel_layout = av_get_default_channel_layout(wanted_nb_channels);

         wanted_channel_layout &= ~AV_CH_LAYOUT_STEREO_DOWNMIX;
     }

     wanted_nb_channels = av_get_channel_layout_nb_channels(wanted_channel_layout);
     wanted_spec.channels = wanted_nb_channels;

     wanted_spec.freq = wanted_sample_rate;

     if (wanted_spec.freq <= 0 || wanted_spec.channels <= 0) {

         av_log(NULL, AV_LOG_ERROR, "Invalid sample rate or channel count!\n");

         return -1;
     }

     while (next_sample_rate_idx && next_sample_rates[next_sample_rate_idx] >= wanted_spec.freq)
         next_sample_rate_idx--;

     wanted_spec.format = AUDIO_S16SYS;
     wanted_spec.silence = 0;

     wanted_spec.samples = FFMAX(SDL_AUDIO_MIN_BUFFER_SIZE, 2 << av_log2(wanted_spec.freq / SDL_AUDIO_MAX_CALLBACKS_PER_SEC));

     wanted_spec.callback = sdl_audio_callback;

     wanted_spec.userdata = opaque;

     while (SDL_OpenAudio(&wanted_spec, &spec) < 0) {

         av_log(NULL, AV_LOG_WARNING, "SDL_OpenAudio (%d channels, %d Hz): %s\n",
                wanted_spec.channels, wanted_spec.freq, SDL_GetError());

         wanted_spec.channels = next_nb_channels[FFMIN(7, wanted_spec.channels)];
         if (!wanted_spec.channels) {

             wanted_spec.freq = next_sample_rates[next_sample_rate_idx--];
             wanted_spec.channels = wanted_nb_channels;
             if (!wanted_spec.freq) {
                 av_log(NULL, AV_LOG_ERROR,
                        "No more combinations to try, audio open failed\n");
                 return -1;
             }

         }
         wanted_channel_layout = av_get_default_channel_layout(wanted_spec.channels);

     }
     if (spec.format != AUDIO_S16SYS) {

         av_log(NULL, AV_LOG_ERROR,
                "SDL advised audio format %d is not supported!\n", spec.format);

         return -1;
     }
     if (spec.channels != wanted_spec.channels) {
         wanted_channel_layout = av_get_default_channel_layout(spec.channels);
         if (!wanted_channel_layout) {

             av_log(NULL, AV_LOG_ERROR,
                    "SDL advised channel count %d is not supported!\n", spec.channels);

             return -1;
         }
     }
 

     audio_hw_params->fmt = AV_SAMPLE_FMT_S16;
     audio_hw_params->freq = spec.freq;
     audio_hw_params->channel_layout = wanted_channel_layout;
     audio_hw_params->channels =  spec.channels;

     audio_hw_params->frame_size = av_samples_get_buffer_size(NULL, audio_hw_params->channels, 1, audio_hw_params->fmt, 1);
     audio_hw_params->bytes_per_sec = av_samples_get_buffer_size(NULL, audio_hw_params->channels, audio_hw_params->freq, audio_hw_params->fmt, 1);
     if (audio_hw_params->bytes_per_sec <= 0 || audio_hw_params->frame_size <= 0) {
         av_log(NULL, AV_LOG_ERROR, "av_samples_get_buffer_size failed\n");
         return -1;
     }

     return spec.size;

 }
 

 /* open a given stream. Return 0 if OK */
 static int stream_component_open(VideoState *is, int stream_index)
 {
     AVFormatContext *ic = is->ic;

     AVCodecContext *avctx;

     AVCodec *codec;

     const char *forced_codec_name = NULL;

     AVDictionary *opts;
     AVDictionaryEntry *t = NULL;

     int sample_rate, nb_channels;
     int64_t channel_layout;

     int ret = 0;

     int stream_lowres = lowres;

 
     if (stream_index < 0 || stream_index >= ic->nb_streams)
         return -1;

     avctx = ic->streams[stream_index]->codec;

     codec = avcodec_find_decoder(avctx->codec_id);

     switch(avctx->codec_type){

         case AVMEDIA_TYPE_AUDIO   : is->last_audio_stream    = stream_index; forced_codec_name =    audio_codec_name; break;
         case AVMEDIA_TYPE_SUBTITLE: is->last_subtitle_stream = stream_index; forced_codec_name = subtitle_codec_name; break;
         case AVMEDIA_TYPE_VIDEO   : is->last_video_stream    = stream_index; forced_codec_name =    video_codec_name; break;

     }

     if (forced_codec_name)
         codec = avcodec_find_decoder_by_name(forced_codec_name);
     if (!codec) {

         if (forced_codec_name) av_log(NULL, AV_LOG_WARNING,
                                       "No codec could be found with name '%s'\n", forced_codec_name);
         else                   av_log(NULL, AV_LOG_WARNING,
                                       "No codec could be found with id %d\n", avctx->codec_id);

         return -1;

     }

     avctx->codec_id = codec->id;

     if(stream_lowres > av_codec_get_max_lowres(codec)){

         av_log(avctx, AV_LOG_WARNING, "The maximum value for lowres supported by the decoder is %d\n",

                 av_codec_get_max_lowres(codec));

         stream_lowres = av_codec_get_max_lowres(codec);

     }

     av_codec_set_lowres(avctx, stream_lowres);

 #if FF_API_EMU_EDGE

     if(stream_lowres) avctx->flags |= CODEC_FLAG_EMU_EDGE;

 #endif

     if (fast)
         avctx->flags2 |= AV_CODEC_FLAG2_FAST;

 #if FF_API_EMU_EDGE

     if(codec->capabilities & AV_CODEC_CAP_DR1)

         avctx->flags |= CODEC_FLAG_EMU_EDGE;

 #endif

     opts = filter_codec_opts(codec_opts, avctx->codec_id, ic, ic->streams[stream_index], codec);

     if (!av_dict_get(opts, "threads", NULL, 0))
         av_dict_set(&opts, "threads", "auto", 0);

     if (stream_lowres)

         av_dict_set_int(&opts, "lowres", stream_lowres, 0);

     if (avctx->codec_type == AVMEDIA_TYPE_VIDEO || avctx->codec_type == AVMEDIA_TYPE_AUDIO)

         av_dict_set(&opts, "refcounted_frames", "1", 0);

     if ((ret = avcodec_open2(avctx, codec, &opts)) < 0) {
         goto fail;
     }

     if ((t = av_dict_get(opts, "", NULL, AV_DICT_IGNORE_SUFFIX))) {
         av_log(NULL, AV_LOG_ERROR, "Option %s not found.\n", t->key);

         ret =  AVERROR_OPTION_NOT_FOUND;
         goto fail;

     }

     is->eof = 0;

     ic->streams[stream_index]->discard = AVDISCARD_DEFAULT;

     switch (avctx->codec_type) {

     case AVMEDIA_TYPE_AUDIO:

 #if CONFIG_AVFILTER
         {
             AVFilterLink *link;
 
             is->audio_filter_src.freq           = avctx->sample_rate;
             is->audio_filter_src.channels       = avctx->channels;
             is->audio_filter_src.channel_layout = get_valid_channel_layout(avctx->channel_layout, avctx->channels);
             is->audio_filter_src.fmt            = avctx->sample_fmt;
             if ((ret = configure_audio_filters(is, afilters, 0)) < 0)

                 goto fail;

             link = is->out_audio_filter->inputs[0];
             sample_rate    = link->sample_rate;
             nb_channels    = link->channels;
             channel_layout = link->channel_layout;
         }
 #else
         sample_rate    = avctx->sample_rate;
         nb_channels    = avctx->channels;
         channel_layout = avctx->channel_layout;
 #endif
 

         /* prepare audio output */

         if ((ret = audio_open(is, channel_layout, nb_channels, sample_rate, &is->audio_tgt)) < 0)

             goto fail;

         is->audio_hw_buf_size = ret;
         is->audio_src = is->audio_tgt;

         is->audio_buf_size  = 0;

         is->audio_buf_index = 0;

 
         /* init averaging filter */

         is->audio_diff_avg_coef  = exp(log(0.01) / AUDIO_DIFF_AVG_NB);

         is->audio_diff_avg_count = 0;
         /* since we do not have a precise anough audio fifo fullness,
            we correct audio sync only if larger than this threshold */

         is->audio_diff_threshold = (double)(is->audio_hw_buf_size) / is->audio_tgt.bytes_per_sec;

         is->audio_stream = stream_index;
         is->audio_st = ic->streams[stream_index];
 

         decoder_init(&is->auddec, avctx, &is->audioq, is->continue_read_thread);

         if ((is->ic->iformat->flags & (AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK)) && !is->ic->iformat->read_seek) {
             is->auddec.start_pts = is->audio_st->start_time;
             is->auddec.start_pts_tb = is->audio_st->time_base;
         }

         decoder_start(&is->auddec, audio_thread, is);

         SDL_PauseAudio(0);

         break;

     case AVMEDIA_TYPE_VIDEO:

         is->video_stream = stream_index;
         is->video_st = ic->streams[stream_index];
 

         is->viddec_width  = avctx->width;
         is->viddec_height = avctx->height;
 

         decoder_init(&is->viddec, avctx, &is->videoq, is->continue_read_thread);

         decoder_start(&is->viddec, video_thread, is);

         is->queue_attachments_req = 1;

         break;

     case AVMEDIA_TYPE_SUBTITLE:

         is->subtitle_stream = stream_index;
         is->subtitle_st = ic->streams[stream_index];

         decoder_init(&is->subdec, avctx, &is->subtitleq, is->continue_read_thread);

         decoder_start(&is->subdec, subtitle_thread, is);

         break;

     default:
         break;
     }

 
 fail:
     av_dict_free(&opts);
 
     return ret;

 }
 
 static void stream_component_close(VideoState *is, int stream_index)
 {
     AVFormatContext *ic = is->ic;

     AVCodecContext *avctx;

     if (stream_index < 0 || stream_index >= ic->nb_streams)
         return;

     avctx = ic->streams[stream_index]->codec;

     switch (avctx->codec_type) {

     case AVMEDIA_TYPE_AUDIO:

         decoder_abort(&is->auddec, &is->sampq);

         SDL_CloseAudio();

         decoder_destroy(&is->auddec);

         swr_free(&is->swr_ctx);

         av_freep(&is->audio_buf1);

         is->audio_buf1_size = 0;

         is->audio_buf = NULL;

 
         if (is->rdft) {
             av_rdft_end(is->rdft);
             av_freep(&is->rdft_data);

             is->rdft = NULL;
             is->rdft_bits = 0;

         }

         break;

     case AVMEDIA_TYPE_VIDEO:

         decoder_abort(&is->viddec, &is->pictq);

         decoder_destroy(&is->viddec);

         break;

     case AVMEDIA_TYPE_SUBTITLE:

         decoder_abort(&is->subdec, &is->subpq);

         decoder_destroy(&is->subdec);

         break;

     default:
         break;
     }
 

     ic->streams[stream_index]->discard = AVDISCARD_ALL;

     avcodec_close(avctx);

     switch (avctx->codec_type) {

     case AVMEDIA_TYPE_AUDIO:

         is->audio_st = NULL;
         is->audio_stream = -1;
         break;

     case AVMEDIA_TYPE_VIDEO:

         is->video_st = NULL;
         is->video_stream = -1;
         break;

     case AVMEDIA_TYPE_SUBTITLE:

         is->subtitle_st = NULL;
         is->subtitle_stream = -1;
         break;

     default:
         break;
     }
 }
 

 static int decode_interrupt_cb(void *ctx)

 {

     VideoState *is = ctx;
     return is->abort_request;

 }

 static int is_realtime(AVFormatContext *s)
 {
     if(   !strcmp(s->iformat->name, "rtp")
        || !strcmp(s->iformat->name, "rtsp")
        || !strcmp(s->iformat->name, "sdp")
     )
         return 1;
 
     if(s->pb && (   !strncmp(s->filename, "rtp:", 4)
                  || !strncmp(s->filename, "udp:", 4)
                 )
     )
         return 1;
     return 0;
 }
 

 /* this thread gets the stream from the disk or the network */

 static int read_thread(void *arg)

 {
     VideoState *is = arg;

     AVFormatContext *ic = NULL;

     int err, i, ret;

     int st_index[AVMEDIA_TYPE_NB];

     AVPacket pkt1, *pkt = &pkt1;

     int64_t stream_start_time;

     int pkt_in_play_range = 0;

     AVDictionaryEntry *t;

     AVDictionary **opts;
     int orig_nb_streams;

     SDL_mutex *wait_mutex = SDL_CreateMutex();

     int scan_all_pmts_set = 0;

     int64_t pkt_ts;

     memset(st_index, -1, sizeof(st_index));

     is->last_video_stream = is->video_stream = -1;
     is->last_audio_stream = is->audio_stream = -1;
     is->last_subtitle_stream = is->subtitle_stream = -1;

     is->eof = 0;

     ic = avformat_alloc_context();

     if (!ic) {
         av_log(NULL, AV_LOG_FATAL, "Could not allocate context.\n");
         ret = AVERROR(ENOMEM);
         goto fail;
     }

     ic->interrupt_callback.callback = decode_interrupt_cb;

     ic->interrupt_callback.opaque = is;

     if (!av_dict_get(format_opts, "scan_all_pmts", NULL, AV_DICT_MATCH_CASE)) {
         av_dict_set(&format_opts, "scan_all_pmts", "1", AV_DICT_DONT_OVERWRITE);
         scan_all_pmts_set = 1;
     }

     err = avformat_open_input(&ic, is->filename, is->iformat, &format_opts);

     if (err < 0) {
         print_error(is->filename, err);
         ret = -1;
         goto fail;
     }

     if (scan_all_pmts_set)
         av_dict_set(&format_opts, "scan_all_pmts", NULL, AV_DICT_MATCH_CASE);
 

     if ((t = av_dict_get(format_opts, "", NULL, AV_DICT_IGNORE_SUFFIX))) {
         av_log(NULL, AV_LOG_ERROR, "Option %s not found.\n", t->key);
         ret = AVERROR_OPTION_NOT_FOUND;
         goto fail;
     }

     is->ic = ic;

     if (genpts)

         ic->flags |= AVFMT_FLAG_GENPTS;
 

     av_format_inject_global_side_data(ic);
 

     opts = setup_find_stream_info_opts(ic, codec_opts);

     orig_nb_streams = ic->nb_streams;

     err = avformat_find_stream_info(ic, opts);

 
     for (i = 0; i < orig_nb_streams; i++)
         av_dict_free(&opts[i]);
     av_freep(&opts);
 

     if (err < 0) {

         av_log(NULL, AV_LOG_WARNING,
                "%s: could not find codec parameters\n", is->filename);

         ret = -1;
         goto fail;
     }

     if (ic->pb)

         ic->pb->eof_reached = 0; // FIXME hack, ffplay maybe should not use avio_feof() to test for the end

     if (seek_by_bytes < 0)

         seek_by_bytes = !!(ic->iformat->flags & AVFMT_TS_DISCONT) && strcmp("ogg", ic->iformat->name);

     is->max_frame_duration = (ic->iformat->flags & AVFMT_TS_DISCONT) ? 10.0 : 3600.0;
 

     if (!window_title && (t = av_dict_get(ic->metadata, "title", NULL, 0)))
         window_title = av_asprintf("%s - %s", t->value, input_filename);
 

     /* if seeking requested, we execute it */
     if (start_time != AV_NOPTS_VALUE) {
         int64_t timestamp;
 
         timestamp = start_time;
         /* add the stream start time */
         if (ic->start_time != AV_NOPTS_VALUE)
             timestamp += ic->start_time;

         ret = avformat_seek_file(ic, -1, INT64_MIN, timestamp, INT64_MAX, 0);

         if (ret < 0) {

             av_log(NULL, AV_LOG_WARNING, "%s: could not seek to position %0.3f\n",

                     is->filename, (double)timestamp / AV_TIME_BASE);
         }
     }
 

     is->realtime = is_realtime(ic);
 

     if (show_status)
         av_dump_format(ic, 0, is->filename, 0);
 

     for (i = 0; i < ic->nb_streams; i++) {
         AVStream *st = ic->streams[i];
         enum AVMediaType type = st->codec->codec_type;
         st->discard = AVDISCARD_ALL;
         if (wanted_stream_spec[type] && st_index[type] == -1)
             if (avformat_match_stream_specifier(ic, st, wanted_stream_spec[type]) > 0)
                 st_index[type] = i;
     }
     for (i = 0; i < AVMEDIA_TYPE_NB; i++) {
         if (wanted_stream_spec[i] && st_index[i] == -1) {
             av_log(NULL, AV_LOG_ERROR, "Stream specifier %s does not match any %s stream\n", wanted_stream_spec[i], av_get_media_type_string(i));
             st_index[i] = INT_MAX;
         }
     }
 

     if (!video_disable)

         st_index[AVMEDIA_TYPE_VIDEO] =
             av_find_best_stream(ic, AVMEDIA_TYPE_VIDEO,

                                 st_index[AVMEDIA_TYPE_VIDEO], -1, NULL, 0);

     if (!audio_disable)

         st_index[AVMEDIA_TYPE_AUDIO] =
             av_find_best_stream(ic, AVMEDIA_TYPE_AUDIO,

                                 st_index[AVMEDIA_TYPE_AUDIO],

                                 st_index[AVMEDIA_TYPE_VIDEO],
                                 NULL, 0);

     if (!video_disable && !subtitle_disable)

         st_index[AVMEDIA_TYPE_SUBTITLE] =
             av_find_best_stream(ic, AVMEDIA_TYPE_SUBTITLE,

                                 st_index[AVMEDIA_TYPE_SUBTITLE],

                                 (st_index[AVMEDIA_TYPE_AUDIO] >= 0 ?
                                  st_index[AVMEDIA_TYPE_AUDIO] :
                                  st_index[AVMEDIA_TYPE_VIDEO]),
                                 NULL, 0);

     is->show_mode = show_mode;

     if (st_index[AVMEDIA_TYPE_VIDEO] >= 0) {
         AVStream *st = ic->streams[st_index[AVMEDIA_TYPE_VIDEO]];
         AVCodecContext *avctx = st->codec;

         AVRational sar = av_guess_sample_aspect_ratio(ic, st, NULL);
         if (avctx->width)
             set_default_window_size(avctx->width, avctx->height, sar);

     }

     /* open the streams */

     if (st_index[AVMEDIA_TYPE_AUDIO] >= 0) {
         stream_component_open(is, st_index[AVMEDIA_TYPE_AUDIO]);

     }
 

     ret = -1;

     if (st_index[AVMEDIA_TYPE_VIDEO] >= 0) {

         ret = stream_component_open(is, st_index[AVMEDIA_TYPE_VIDEO]);

     }

     if (is->show_mode == SHOW_MODE_NONE)
         is->show_mode = ret >= 0 ? SHOW_MODE_VIDEO : SHOW_MODE_RDFT;

     if (st_index[AVMEDIA_TYPE_SUBTITLE] >= 0) {
         stream_component_open(is, st_index[AVMEDIA_TYPE_SUBTITLE]);

     }
 

     if (is->video_stream < 0 && is->audio_stream < 0) {

         av_log(NULL, AV_LOG_FATAL, "Failed to open file '%s' or configure filtergraph\n",
                is->filename);

         ret = -1;

         goto fail;
     }
 

     if (infinite_buffer < 0 && is->realtime)

         infinite_buffer = 1;
 

     for (;;) {

         if (is->abort_request)
             break;

         if (is->paused != is->last_paused) {
             is->last_paused = is->paused;

             if (is->paused)

                 is->read_pause_return = av_read_pause(ic);

             else
                 av_read_play(ic);

         }

 #if CONFIG_RTSP_DEMUXER || CONFIG_MMSH_PROTOCOL
         if (is->paused &&
                 (!strcmp(ic->iformat->name, "rtsp") ||

                  (ic->pb && !strncmp(input_filename, "mmsh:", 5)))) {

             /* wait 10 ms to avoid trying to get another packet */
             /* XXX: horrible */
             SDL_Delay(10);
             continue;
         }

 #endif

         if (is->seek_req) {

             int64_t seek_target = is->seek_pos;
             int64_t seek_min    = is->seek_rel > 0 ? seek_target - is->seek_rel + 2: INT64_MIN;
             int64_t seek_max    = is->seek_rel < 0 ? seek_target - is->seek_rel - 2: INT64_MAX;
 // FIXME the +-2 is due to rounding being not done in the correct direction in generation

 //      of the seek_pos/seek_rel variables

             ret = avformat_seek_file(is->ic, -1, seek_min, seek_target, seek_max, is->seek_flags);

             if (ret < 0) {

                 av_log(NULL, AV_LOG_ERROR,
                        "%s: error while seeking\n", is->ic->filename);

             } else {

                 if (is->audio_stream >= 0) {
                     packet_queue_flush(&is->audioq);

                     packet_queue_put(&is->audioq, &flush_pkt);

                 }

                 if (is->subtitle_stream >= 0) {
                     packet_queue_flush(&is->subtitleq);

                     packet_queue_put(&is->subtitleq, &flush_pkt);

                 }

                 if (is->video_stream >= 0) {
                     packet_queue_flush(&is->videoq);

                     packet_queue_put(&is->videoq, &flush_pkt);

                 }

                 if (is->seek_flags & AVSEEK_FLAG_BYTE) {

                    set_clock(&is->extclk, NAN, 0);

                 } else {

                    set_clock(&is->extclk, seek_target / (double)AV_TIME_BASE, 0);

                 }

             }
             is->seek_req = 0;

             is->queue_attachments_req = 1;

             is->eof = 0;

             if (is->paused)
                 step_to_next_frame(is);

         }

         if (is->queue_attachments_req) {

             if (is->video_st && is->video_st->disposition & AV_DISPOSITION_ATTACHED_PIC) {
                 AVPacket copy;
                 if ((ret = av_copy_packet(&copy, &is->video_st->attached_pic)) < 0)
                     goto fail;
                 packet_queue_put(&is->videoq, &copy);

                 packet_queue_put_nullpacket(&is->videoq, is->video_stream);

             }

             is->queue_attachments_req = 0;

         }

         /* if the queue are full, no need to read more */

         if (infinite_buffer<1 &&

               (is->audioq.size + is->videoq.size + is->subtitleq.size > MAX_QUEUE_SIZE

             || (   (is->audioq   .nb_packets > MIN_FRAMES || is->audio_stream < 0 || is->audioq.abort_request)

                 && (is->videoq   .nb_packets > MIN_FRAMES || is->video_stream < 0 || is->videoq.abort_request
                     || (is->video_st->disposition & AV_DISPOSITION_ATTACHED_PIC))

                 && (is->subtitleq.nb_packets > MIN_FRAMES || is->subtitle_stream < 0 || is->subtitleq.abort_request)))) {

             /* wait 10 ms */

             SDL_LockMutex(wait_mutex);
             SDL_CondWaitTimeout(is->continue_read_thread, wait_mutex, 10);
             SDL_UnlockMutex(wait_mutex);

             continue;
         }

         if (!is->paused &&

             (!is->audio_st || (is->auddec.finished == is->audioq.serial && frame_queue_nb_remaining(&is->sampq) == 0)) &&

             (!is->video_st || (is->viddec.finished == is->videoq.serial && frame_queue_nb_remaining(&is->pictq) == 0))) {

             if (loop != 1 && (!loop || --loop)) {
                 stream_seek(is, start_time != AV_NOPTS_VALUE ? start_time : 0, 0, 0);
             } else if (autoexit) {
                 ret = AVERROR_EOF;
                 goto fail;
             }
         }

         ret = av_read_frame(ic, pkt);

         if (ret < 0) {

             if ((ret == AVERROR_EOF || avio_feof(ic->pb)) && !is->eof) {

                 if (is->video_stream >= 0)
                     packet_queue_put_nullpacket(&is->videoq, is->video_stream);
                 if (is->audio_stream >= 0)
                     packet_queue_put_nullpacket(&is->audioq, is->audio_stream);
                 if (is->subtitle_stream >= 0)
                     packet_queue_put_nullpacket(&is->subtitleq, is->subtitle_stream);

                 is->eof = 1;

             }

             if (ic->pb && ic->pb->error)

                 break;

             SDL_LockMutex(wait_mutex);
             SDL_CondWaitTimeout(is->continue_read_thread, wait_mutex, 10);
             SDL_UnlockMutex(wait_mutex);

             continue;

         } else {

             is->eof = 0;

         }

         /* check if packet is in play range specified by user, then queue, otherwise discard */

         stream_start_time = ic->streams[pkt->stream_index]->start_time;

         pkt_ts = pkt->pts == AV_NOPTS_VALUE ? pkt->dts : pkt->pts;

         pkt_in_play_range = duration == AV_NOPTS_VALUE ||

                 (pkt_ts - (stream_start_time != AV_NOPTS_VALUE ? stream_start_time : 0)) *

                 av_q2d(ic->streams[pkt->stream_index]->time_base) -

                 (double)(start_time != AV_NOPTS_VALUE ? start_time : 0) / 1000000
                 <= ((double)duration / 1000000);

         if (pkt->stream_index == is->audio_stream && pkt_in_play_range) {

             packet_queue_put(&is->audioq, pkt);

         } else if (pkt->stream_index == is->video_stream && pkt_in_play_range
                    && !(is->video_st->disposition & AV_DISPOSITION_ATTACHED_PIC)) {

             packet_queue_put(&is->videoq, pkt);

         } else if (pkt->stream_index == is->subtitle_stream && pkt_in_play_range) {

             packet_queue_put(&is->subtitleq, pkt);

         } else {
             av_free_packet(pkt);
         }
     }
     /* wait until the end */
     while (!is->abort_request) {
         SDL_Delay(100);
     }
 

     ret = 0;

  fail:
     /* close each stream */
     if (is->audio_stream >= 0)
         stream_component_close(is, is->audio_stream);
     if (is->video_stream >= 0)
         stream_component_close(is, is->video_stream);

     if (is->subtitle_stream >= 0)
         stream_component_close(is, is->subtitle_stream);

     if (ic) {
         avformat_close_input(&ic);
         is->ic = NULL;

     }

     if (ret != 0) {
         SDL_Event event;

         event.type = FF_QUIT_EVENT;
         event.user.data1 = is;
         SDL_PushEvent(&event);
     }

     SDL_DestroyMutex(wait_mutex);

     return 0;
 }
 

 static VideoState *stream_open(const char *filename, AVInputFormat *iformat)

 {
     VideoState *is;
 
     is = av_mallocz(sizeof(VideoState));
     if (!is)
         return NULL;

     av_strlcpy(is->filename, filename, sizeof(is->filename));

     is->iformat = iformat;

     is->ytop    = 0;
     is->xleft   = 0;

 
     /* start video display */

     if (frame_queue_init(&is->pictq, &is->videoq, VIDEO_PICTURE_QUEUE_SIZE, 1) < 0)
         goto fail;
     if (frame_queue_init(&is->subpq, &is->subtitleq, SUBPICTURE_QUEUE_SIZE, 0) < 0)
         goto fail;

     if (frame_queue_init(&is->sampq, &is->audioq, SAMPLE_QUEUE_SIZE, 1) < 0)
         goto fail;

     packet_queue_init(&is->videoq);
     packet_queue_init(&is->audioq);
     packet_queue_init(&is->subtitleq);
 

     is->continue_read_thread = SDL_CreateCond();
 

     init_clock(&is->vidclk, &is->videoq.serial);
     init_clock(&is->audclk, &is->audioq.serial);
     init_clock(&is->extclk, &is->extclk.serial);

     is->audio_clock_serial = -1;

     is->av_sync_type = av_sync_type;

     is->read_tid     = SDL_CreateThread(read_thread, is);

     if (!is->read_tid) {

 fail:
         stream_close(is);

         return NULL;
     }
     return is;
 }
 

 static void stream_cycle_channel(VideoState *is, int codec_type)

 {
     AVFormatContext *ic = is->ic;
     int start_index, stream_index;

     int old_index;

     AVStream *st;

     AVProgram *p = NULL;
     int nb_streams = is->ic->nb_streams;

     if (codec_type == AVMEDIA_TYPE_VIDEO) {
         start_index = is->last_video_stream;
         old_index = is->video_stream;
     } else if (codec_type == AVMEDIA_TYPE_AUDIO) {
         start_index = is->last_audio_stream;
         old_index = is->audio_stream;
     } else {
         start_index = is->last_subtitle_stream;
         old_index = is->subtitle_stream;
     }

     stream_index = start_index;

 
     if (codec_type != AVMEDIA_TYPE_VIDEO && is->video_stream != -1) {
         p = av_find_program_from_stream(ic, NULL, is->video_stream);
         if (p) {
             nb_streams = p->nb_stream_indexes;
             for (start_index = 0; start_index < nb_streams; start_index++)
                 if (p->stream_index[start_index] == stream_index)
                     break;
             if (start_index == nb_streams)
                 start_index = -1;
             stream_index = start_index;
         }
     }
 

     for (;;) {

         if (++stream_index >= nb_streams)

         {

             if (codec_type == AVMEDIA_TYPE_SUBTITLE)

             {
                 stream_index = -1;

                 is->last_subtitle_stream = -1;

                 goto the_end;

             }
             if (start_index == -1)
                 return;
             stream_index = 0;

         }

         if (stream_index == start_index)
             return;

         st = is->ic->streams[p ? p->stream_index[stream_index] : stream_index];

         if (st->codec->codec_type == codec_type) {

             /* check that parameters are OK */

             switch (codec_type) {

             case AVMEDIA_TYPE_AUDIO:

                 if (st->codec->sample_rate != 0 &&
                     st->codec->channels != 0)

                     goto the_end;
                 break;

             case AVMEDIA_TYPE_VIDEO:
             case AVMEDIA_TYPE_SUBTITLE:

                 goto the_end;
             default:
                 break;
             }
         }
     }
  the_end:

     if (p && stream_index != -1)
         stream_index = p->stream_index[stream_index];

     av_log(NULL, AV_LOG_INFO, "Switch %s stream from #%d to #%d\n",
            av_get_media_type_string(codec_type),
            old_index,
            stream_index);
 

     stream_component_close(is, old_index);

     stream_component_open(is, stream_index);
 }
 
 

 static void toggle_full_screen(VideoState *is)

 {

 #if defined(__APPLE__) && SDL_VERSION_ATLEAST(1, 2, 14)

     /* OS X needs to reallocate the SDL overlays */

     int i;
     for (i = 0; i < VIDEO_PICTURE_QUEUE_SIZE; i++)

         is->pictq.queue[i].reallocate = 1;

 #endif

     is_full_screen = !is_full_screen;

     video_open(is, 1, NULL);

 }
 

 static void toggle_audio_display(VideoState *is)

 {

     int bgcolor = SDL_MapRGB(screen->format, 0x00, 0x00, 0x00);

     int next = is->show_mode;
     do {
         next = (next + 1) % SHOW_MODE_NB;
     } while (next != is->show_mode && (next == SHOW_MODE_VIDEO && !is->video_st || next != SHOW_MODE_VIDEO && !is->audio_st));
     if (is->show_mode != next) {
         fill_rectangle(screen,
                     is->xleft, is->ytop, is->width, is->height,
                     bgcolor, 1);
         is->force_refresh = 1;
         is->show_mode = next;
     }

 }
 

 static void refresh_loop_wait_event(VideoState *is, SDL_Event *event) {

     double remaining_time = 0.0;
     SDL_PumpEvents();
     while (!SDL_PeepEvents(event, 1, SDL_GETEVENT, SDL_ALLEVENTS)) {

         if (!cursor_hidden && av_gettime_relative() - cursor_last_shown > CURSOR_HIDE_DELAY) {

             SDL_ShowCursor(0);
             cursor_hidden = 1;
         }

         if (remaining_time > 0.0)
             av_usleep((int64_t)(remaining_time * 1000000.0));

         remaining_time = REFRESH_RATE;
         if (is->show_mode != SHOW_MODE_NONE && (!is->paused || is->force_refresh))
             video_refresh(is, &remaining_time);
         SDL_PumpEvents();

     }

 }
 

 static void seek_chapter(VideoState *is, int incr)
 {
     int64_t pos = get_master_clock(is) * AV_TIME_BASE;
     int i;
 
     if (!is->ic->nb_chapters)
         return;
 
     /* find the current chapter */
     for (i = 0; i < is->ic->nb_chapters; i++) {
         AVChapter *ch = is->ic->chapters[i];
         if (av_compare_ts(pos, AV_TIME_BASE_Q, ch->start, ch->time_base) < 0) {
             i--;
             break;
         }
     }
 
     i += incr;
     i = FFMAX(i, 0);
     if (i >= is->ic->nb_chapters)
         return;
 
     av_log(NULL, AV_LOG_VERBOSE, "Seeking to chapter %d.\n", i);
     stream_seek(is, av_rescale_q(is->ic->chapters[i]->start, is->ic->chapters[i]->time_base,
                                  AV_TIME_BASE_Q), 0, 0);
 }
 

 /* handle an event sent by the GUI */

 static void event_loop(VideoState *cur_stream)

 {
     SDL_Event event;

     double incr, pos, frac;

     for (;;) {

         double x;

         refresh_loop_wait_event(cur_stream, &event);

         switch (event.type) {