/*
  * Copyright (c) 2012 Georg Lippitsch <georg.lippitsch@gmx.at>
  *
  * 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
  * libiec61883 interface
  */
 
 #include <sys/poll.h>
 #include <libraw1394/raw1394.h>
 #include <libavc1394/avc1394.h>
 #include <libavc1394/rom1394.h>
 #include <libiec61883/iec61883.h>
 #include "libavformat/dv.h"
 #include "libavformat/mpegts.h"
 #include "libavutil/opt.h"
 #include "avdevice.h"
 
 #define THREADS HAVE_PTHREADS
 
 #if THREADS
 #include <pthread.h>
 #endif
 
 #define MOTDCT_SPEC_ID      0x00005068
 #define IEC61883_AUTO       0
 #define IEC61883_DV         1
 #define IEC61883_HDV        2
 
 /**
  * For DV, one packet corresponds exactly to one frame.
  * For HDV, these are MPEG2 transport stream packets.
  * The queue is implemented as linked list.
  */
 typedef struct DVPacket {
     uint8_t *buf;                       ///< actual buffer data
     int len;                            ///< size of buffer allocated
     struct DVPacket *next;              ///< next DVPacket
 } DVPacket;
 
 struct iec61883_data {
     AVClass *class;
     raw1394handle_t raw1394;            ///< handle for libraw1394
     iec61883_dv_fb_t iec61883_dv;       ///< handle for libiec61883 when used with DV
     iec61883_mpeg2_t iec61883_mpeg2;    ///< handle for libiec61883 when used with HDV
 
     DVDemuxContext *dv_demux;           ///< generic DV muxing/demuxing context
     MpegTSContext *mpeg_demux;          ///< generic HDV muxing/demuxing context
 
     DVPacket *queue_first;              ///< first element of packet queue
     DVPacket *queue_last;               ///< last element of packet queue
 

     char *device_guid;                  ///< to select one of multiple DV devices
 

     int packets;                        ///< Number of packets queued
     int max_packets;                    ///< Max. number of packets in queue
 
     int bandwidth;                      ///< returned by libiec61883
     int channel;                        ///< returned by libiec61883
     int input_port;                     ///< returned by libiec61883
     int type;                           ///< Stream type, to distinguish DV/HDV
     int node;                           ///< returned by libiec61883
     int output_port;                    ///< returned by libiec61883
     int thread_loop;                    ///< Condition for thread while-loop
     int receiving;                      ///< True as soon data from device available
     int receive_error;                  ///< Set in receive task in case of error
     int eof;                            ///< True as soon as no more data available
 
     struct pollfd raw1394_poll;         ///< to poll for new data from libraw1394
 
     /** Parse function for DV/HDV differs, so this is set before packets arrive */
     int (*parse_queue)(struct iec61883_data *dv, AVPacket *pkt);
 
 #if THREADS
     pthread_t receive_task_thread;
     pthread_mutex_t mutex;
     pthread_cond_t cond;
 #endif
 };
 
 static int iec61883_callback(unsigned char *data, int length,
                              int complete, void *callback_data)
 {
     struct iec61883_data *dv = callback_data;
     DVPacket *packet;
     int ret;
 

 #if THREADS

     pthread_mutex_lock(&dv->mutex);
 #endif
 
     if (dv->packets >= dv->max_packets) {
         av_log(NULL, AV_LOG_ERROR, "DV packet queue overrun, dropping.\n");
         ret = 0;
         goto exit;
     }
 
     packet = av_mallocz(sizeof(*packet));
     if (!packet) {
         ret = -1;
         goto exit;
     }
 
     packet->buf = av_malloc(length);
     if (!packet->buf) {
         ret = -1;
         goto exit;
     }
     packet->len = length;
 
     memcpy(packet->buf, data, length);
 
     if (dv->queue_first) {
         dv->queue_last->next = packet;
         dv->queue_last = packet;
     } else {
         dv->queue_first = packet;
         dv->queue_last = packet;
     }
     dv->packets++;
 
     ret = 0;
 
 exit:

 #if THREADS

     pthread_cond_broadcast(&dv->cond);

     pthread_mutex_unlock(&dv->mutex);
 #endif
     return ret;
 }
 
 static void *iec61883_receive_task(void *opaque)
 {
     struct iec61883_data *dv = (struct iec61883_data *)opaque;
     int result;
 

 #if THREADS

     while (dv->thread_loop)
 #endif
     {
         while ((result = poll(&dv->raw1394_poll, 1, 200)) < 0) {
             if (!(errno == EAGAIN || errno == EINTR)) {
                 av_log(NULL, AV_LOG_ERROR, "Raw1394 poll error occurred.\n");
                 dv->receive_error = AVERROR(EIO);
                 return NULL;
             }
         }
         if (result > 0 && ((dv->raw1394_poll.revents & POLLIN)
                            || (dv->raw1394_poll.revents & POLLPRI))) {
             dv->receiving = 1;
             raw1394_loop_iterate(dv->raw1394);
         } else if (dv->receiving) {
             av_log(NULL, AV_LOG_ERROR, "No more input data available\n");

 #if THREADS

             pthread_mutex_lock(&dv->mutex);
             dv->eof = 1;

             pthread_cond_broadcast(&dv->cond);

             pthread_mutex_unlock(&dv->mutex);
 #else
             dv->eof = 1;
 #endif
             return NULL;
         }
     }
 
     return NULL;
 }
 
 static int iec61883_parse_queue_dv(struct iec61883_data *dv, AVPacket *pkt)
 {
     DVPacket *packet;
     int size;
 
     size = avpriv_dv_get_packet(dv->dv_demux, pkt);
     if (size > 0)
         return size;
 
     packet = dv->queue_first;
     if (!packet)
         return -1;
 
     size = avpriv_dv_produce_packet(dv->dv_demux, pkt,
                                     packet->buf, packet->len, -1);
     pkt->destruct = av_destruct_packet;
     dv->queue_first = packet->next;
     av_free(packet);
     dv->packets--;
 
     if (size > 0)
         return size;
 
     return -1;
 }
 
 static int iec61883_parse_queue_hdv(struct iec61883_data *dv, AVPacket *pkt)
 {
     DVPacket *packet;
     int size;
 
     while (dv->queue_first) {
         packet = dv->queue_first;

         size = avpriv_mpegts_parse_packet(dv->mpeg_demux, pkt, packet->buf,
                                           packet->len);

         dv->queue_first = packet->next;

         av_freep(&packet->buf);
         av_freep(&packet);

         dv->packets--;
 
         if (size > 0)
             return size;
     }
 
     return -1;
 }
 
 static int iec61883_read_header(AVFormatContext *context)
 {
     struct iec61883_data *dv = context->priv_data;
     struct raw1394_portinfo pinf[16];
     rom1394_directory rom_dir;
     char *endptr;
     int inport;
     int nb_ports;
     int port = -1;
     int response;
     int i, j = 0;

     uint64_t guid = 0;

 
     dv->input_port = -1;
     dv->output_port = -1;
     dv->channel = -1;
 
     dv->raw1394 = raw1394_new_handle();
 
     if (!dv->raw1394) {
         av_log(context, AV_LOG_ERROR, "Failed to open IEEE1394 interface.\n");
         return AVERROR(EIO);
     }
 
     if ((nb_ports = raw1394_get_port_info(dv->raw1394, pinf, 16)) < 0) {
         av_log(context, AV_LOG_ERROR, "Failed to get number of IEEE1394 ports.\n");
         goto fail;
     }
 
     inport = strtol(context->filename, &endptr, 10);
     if (endptr != context->filename && *endptr == '\0') {
         av_log(context, AV_LOG_INFO, "Selecting IEEE1394 port: %d\n", inport);
         j = inport;
         nb_ports = inport + 1;
     } else if (strcmp(context->filename, "auto")) {
         av_log(context, AV_LOG_ERROR, "Invalid input \"%s\", you should specify "
                "\"auto\" for auto-detection, or the port number.\n", context->filename);
         goto fail;
     }
 

     if (dv->device_guid) {
         if (sscanf(dv->device_guid, "%llx", (long long unsigned int *)&guid) != 1) {
             av_log(context, AV_LOG_INFO, "Invalid dvguid parameter: %s\n",
                    dv->device_guid);
             goto fail;
         }
     }

 
     for (; j < nb_ports && port==-1; ++j) {

         raw1394_destroy_handle(dv->raw1394);
 
         if (!(dv->raw1394 = raw1394_new_handle_on_port(j))) {

             av_log(context, AV_LOG_ERROR, "Failed setting IEEE1394 port.\n");
             goto fail;
         }

         for (i=0; i<raw1394_get_nodecount(dv->raw1394); ++i) {

 
             /* Select device explicitly by GUID */
 
             if (guid > 1) {
                 if (guid == rom1394_get_guid(dv->raw1394, i)) {
                     dv->node = i;
                     port = j;
                     break;
                 }
             } else {
 
                 /* Select first AV/C tape recorder player node */
 
                 if (rom1394_get_directory(dv->raw1394, i, &rom_dir) < 0)
                     continue;
                 if (((rom1394_get_node_type(&rom_dir) == ROM1394_NODE_TYPE_AVC) &&
                      avc1394_check_subunit_type(dv->raw1394, i, AVC1394_SUBUNIT_TYPE_VCR)) ||
                     (rom_dir.unit_spec_id == MOTDCT_SPEC_ID)) {
                     rom1394_free_directory(&rom_dir);
                     dv->node = i;
                     port = j;
                     break;
                 }

                 rom1394_free_directory(&rom_dir);
             }
         }
     }
 
     if (port == -1) {
         av_log(context, AV_LOG_ERROR, "No AV/C devices found.\n");
         goto fail;
     }
 

     /* Provide bus sanity for multiple connections */
 
     iec61883_cmp_normalize_output(dv->raw1394, 0xffc0 | dv->node);
 

     /* Find out if device is DV or HDV */
 
     if (dv->type == IEC61883_AUTO) {
         response = avc1394_transaction(dv->raw1394, dv->node,
                                        AVC1394_CTYPE_STATUS |
                                        AVC1394_SUBUNIT_TYPE_TAPE_RECORDER |
                                        AVC1394_SUBUNIT_ID_0 |
                                        AVC1394_VCR_COMMAND_OUTPUT_SIGNAL_MODE |
                                        0xFF, 2);
         response = AVC1394_GET_OPERAND0(response);
         dv->type = (response == 0x10 || response == 0x90 || response == 0x1A || response == 0x9A) ?
             IEC61883_HDV : IEC61883_DV;
     }
 
     /* Connect to device, and do initialization */
 
     dv->channel = iec61883_cmp_connect(dv->raw1394, dv->node, &dv->output_port,
                                        raw1394_get_local_id(dv->raw1394),
                                        &dv->input_port, &dv->bandwidth);
 
     if (dv->channel < 0)
         dv->channel = 63;
 
     if (!dv->max_packets)
         dv->max_packets = 100;
 

     if (CONFIG_MPEGTS_DEMUXER && dv->type == IEC61883_HDV) {

 
         /* Init HDV receive */
 
         avformat_new_stream(context, NULL);
 

         dv->mpeg_demux = avpriv_mpegts_parse_open(context);

         if (!dv->mpeg_demux)
             goto fail;
 
         dv->parse_queue = iec61883_parse_queue_hdv;
 
         dv->iec61883_mpeg2 = iec61883_mpeg2_recv_init(dv->raw1394,
                                                       (iec61883_mpeg2_recv_t)iec61883_callback,
                                                       dv);
 
         dv->max_packets *= 766;
     } else {
 
         /* Init DV receive */
 
         dv->dv_demux = avpriv_dv_init_demux(context);
         if (!dv->dv_demux)
             goto fail;
 
         dv->parse_queue = iec61883_parse_queue_dv;
 
         dv->iec61883_dv = iec61883_dv_fb_init(dv->raw1394, iec61883_callback, dv);
     }
 
     dv->raw1394_poll.fd = raw1394_get_fd(dv->raw1394);
     dv->raw1394_poll.events = POLLIN | POLLERR | POLLHUP | POLLPRI;
 
     /* Actually start receiving */
 
     if (dv->type == IEC61883_HDV)
         iec61883_mpeg2_recv_start(dv->iec61883_mpeg2, dv->channel);
     else
         iec61883_dv_fb_start(dv->iec61883_dv, dv->channel);
 
 #if THREADS
     dv->thread_loop = 1;

     if (pthread_mutex_init(&dv->mutex, NULL))
         goto fail;
     if (pthread_cond_init(&dv->cond, NULL))
         goto fail;
     if (pthread_create(&dv->receive_task_thread, NULL, iec61883_receive_task, dv))
         goto fail;

 #endif
 
     return 0;
 
 fail:
     raw1394_destroy_handle(dv->raw1394);
     return AVERROR(EIO);
 }
 
 static int iec61883_read_packet(AVFormatContext *context, AVPacket *pkt)
 {
     struct iec61883_data *dv = context->priv_data;
     int size;
 
     /**
      * Try to parse frames from queue
      */
 

 #if THREADS

     pthread_mutex_lock(&dv->mutex);
     while ((size = dv->parse_queue(dv, pkt)) == -1)
         if (!dv->eof)
             pthread_cond_wait(&dv->cond, &dv->mutex);
         else
             break;
     pthread_mutex_unlock(&dv->mutex);
 #else
     int result;
     while ((size = dv->parse_queue(dv, pkt)) == -1) {
         iec61883_receive_task((void *)dv);
         if (dv->receive_error)
             return dv->receive_error;
     }
 #endif
 
     return size;
 }
 
 static int iec61883_close(AVFormatContext *context)
 {
     struct iec61883_data *dv = context->priv_data;
 
 #if THREADS
     dv->thread_loop = 0;
     pthread_join(dv->receive_task_thread, NULL);
     pthread_cond_destroy(&dv->cond);
     pthread_mutex_destroy(&dv->mutex);
 #endif
 

     if (CONFIG_MPEGTS_DEMUXER && dv->type == IEC61883_HDV) {

         iec61883_mpeg2_recv_stop(dv->iec61883_mpeg2);
         iec61883_mpeg2_close(dv->iec61883_mpeg2);

         avpriv_mpegts_parse_close(dv->mpeg_demux);

     } else {
         iec61883_dv_fb_stop(dv->iec61883_dv);
         iec61883_dv_fb_close(dv->iec61883_dv);
     }
     while (dv->queue_first) {
         DVPacket *packet = dv->queue_first;
         dv->queue_first = packet->next;

         av_freep(&packet->buf);
         av_freep(&packet);

     }
 
     iec61883_cmp_disconnect(dv->raw1394, dv->node, dv->output_port,
                             raw1394_get_local_id(dv->raw1394),
                             dv->input_port, dv->channel, dv->bandwidth);
 
     raw1394_destroy_handle(dv->raw1394);
 
     return 0;
 }
 
 static const AVOption options[] = {

     { "dvtype", "override autodetection of DV/HDV", offsetof(struct iec61883_data, type), AV_OPT_TYPE_INT, {.i64 = IEC61883_AUTO}, IEC61883_AUTO, IEC61883_HDV, AV_OPT_FLAG_DECODING_PARAM, "dvtype" },

     { "auto",   "auto detect DV/HDV", 0, AV_OPT_TYPE_CONST, {.i64 = IEC61883_AUTO}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "dvtype" },
     { "dv",     "force device being treated as DV device", 0, AV_OPT_TYPE_CONST, {.i64 = IEC61883_DV},   0, 0, AV_OPT_FLAG_DECODING_PARAM, "dvtype" },
     { "hdv" ,   "force device being treated as HDV device", 0, AV_OPT_TYPE_CONST, {.i64 = IEC61883_HDV},  0, 0, AV_OPT_FLAG_DECODING_PARAM, "dvtype" },

     { "dvbuffer", "set queue buffer size (in packets)", offsetof(struct iec61883_data, max_packets), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },

     { "dvguid", "select one of multiple DV devices by its GUID", offsetof(struct iec61883_data, device_guid), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM },

     { NULL },
 };
 
 static const AVClass iec61883_class = {
     .class_name = "iec61883 indev",
     .item_name  = av_default_item_name,
     .option     = options,
     .version    = LIBAVUTIL_VERSION_INT,

     .category   = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,

 };
 
 AVInputFormat ff_iec61883_demuxer = {
     .name           = "iec61883",
     .long_name      = NULL_IF_CONFIG_SMALL("libiec61883 (new DV1394) A/V input device"),
     .priv_data_size = sizeof(struct iec61883_data),
     .read_header    = iec61883_read_header,
     .read_packet    = iec61883_read_packet,
     .read_close     = iec61883_close,
     .flags          = AVFMT_NOFILE,
     .priv_class     = &iec61883_class,
 };