/*
  * Image format
  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
  * Copyright (c) 2004 Michael Niedermayer
  *

  * 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
  */
 
 #include "libavutil/intreadwrite.h"

 #include "libavutil/avassert.h"

 #include "libavutil/avstring.h"
 #include "libavutil/log.h"

 #include "libavutil/opt.h"

 #include "libavutil/pixdesc.h"

 #include "libavutil/time_internal.h"

 #include "avformat.h"
 #include "avio_internal.h"
 #include "internal.h"
 

 typedef struct VideoMuxData {

     const AVClass *class;  /**< Class for private options. */

     int img_number;
     int is_pipe;

     int split_planes;       /**< use independent file for each Y, U, V plane */

     char path[1024];

     int update;

     int use_strftime;

     const char *muxer;

 } VideoMuxData;
 
 static int write_header(AVFormatContext *s)
 {
     VideoMuxData *img = s->priv_data;

     AVStream *st = s->streams[0];

     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(st->codec->pix_fmt);

 
     av_strlcpy(img->path, s->filename, sizeof(img->path));
 
     /* find format */
     if (s->oformat->flags & AVFMT_NOFILE)
         img->is_pipe = 0;
     else
         img->is_pipe = 1;
 

     if (st->codec->codec_id == AV_CODEC_ID_GIF) {
         img->muxer = "gif";
     } else if (st->codec->codec_id == AV_CODEC_ID_RAWVIDEO) {
         const char *str = strrchr(img->path, '.');

         img->split_planes =     str
                              && !av_strcasecmp(str + 1, "y")
                              && s->nb_streams == 1
                              && desc
                              &&(desc->flags & AV_PIX_FMT_FLAG_PLANAR)
                              && desc->nb_components >= 3;

     }

     return 0;
 }
 
 static int write_packet(AVFormatContext *s, AVPacket *pkt)
 {
     VideoMuxData *img = s->priv_data;

     AVIOContext *pb[4];

     char filename[1024];

     AVCodecContext *codec = s->streams[pkt->stream_index]->codec;

     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(codec->pix_fmt);

     int i;
 
     if (!img->is_pipe) {

         if (img->update) {
             av_strlcpy(filename, img->path, sizeof(filename));

         } else if (img->use_strftime) {
             time_t now0;

             struct tm *tm, tmpbuf;

             time(&now0);

             tm = localtime_r(&now0, &tmpbuf);

             if (!strftime(filename, sizeof(filename), img->path, tm)) {
                 av_log(s, AV_LOG_ERROR, "Could not get frame filename with strftime\n");
                 return AVERROR(EINVAL);
             }

         } else if (av_get_frame_filename(filename, sizeof(filename), img->path, img->img_number) < 0 &&
                    img->img_number > 1) {

             av_log(s, AV_LOG_ERROR,

                    "Could not get frame filename number %d from pattern '%s' (either set updatefirst or use a pattern like %%03d within the filename pattern)\n",

                    img->img_number, img->path);

             return AVERROR(EINVAL);

         }

         for (i = 0; i < 4; i++) {

             if (avio_open2(&pb[i], filename, AVIO_FLAG_WRITE,
                            &s->interrupt_callback, NULL) < 0) {

                 av_log(s, AV_LOG_ERROR, "Could not open file : %s\n", filename);

                 return AVERROR(EIO);
             }
 

             if (!img->split_planes || i+1 >= desc->nb_components)

                 break;

             filename[strlen(filename) - 1] = "UVAx"[i];

         }
     } else {
         pb[0] = s->pb;
     }
 

     if (img->split_planes) {

         int ysize = codec->width * codec->height;

         int usize = FF_CEIL_RSHIFT(codec->width, desc->log2_chroma_w) * FF_CEIL_RSHIFT(codec->height, desc->log2_chroma_h);

         if (desc->comp[0].depth_minus1 >= 8) {
             ysize *= 2;
             usize *= 2;
         }

         avio_write(pb[0], pkt->data                , ysize);

         avio_write(pb[1], pkt->data + ysize        , usize);
         avio_write(pb[2], pkt->data + ysize + usize, usize);

         avio_closep(&pb[1]);
         avio_closep(&pb[2]);

         if (desc->nb_components > 3) {
             avio_write(pb[3], pkt->data + ysize + 2*usize, ysize);

             avio_closep(&pb[3]);

         }

     } else if (img->muxer) {
         int ret;
         AVStream *st;
         AVPacket pkt2 = {0};
         AVFormatContext *fmt = NULL;
 
         av_assert0(!img->split_planes);
 
         ret = avformat_alloc_output_context2(&fmt, NULL, img->muxer, s->filename);
         if (ret < 0)
             return ret;
         st = avformat_new_stream(fmt, NULL);
         if (!st) {
             avformat_free_context(fmt);
             return AVERROR(ENOMEM);
         }
         st->id = pkt->stream_index;
 
         fmt->pb = pb[0];
         if ((ret = av_copy_packet(&pkt2, pkt))                            < 0 ||
             (ret = av_dup_packet(&pkt2))                                  < 0 ||
             (ret = avcodec_copy_context(st->codec, s->streams[0]->codec)) < 0 ||
             (ret = avformat_write_header(fmt, NULL))                      < 0 ||
             (ret = av_interleaved_write_frame(fmt, &pkt2))                < 0 ||
             (ret = av_write_trailer(fmt))                                 < 0) {
             av_free_packet(&pkt2);
             avformat_free_context(fmt);
             return ret;
         }
         av_free_packet(&pkt2);
         avformat_free_context(fmt);

     } else {

         avio_write(pb[0], pkt->data, pkt->size);
     }
     avio_flush(pb[0]);
     if (!img->is_pipe) {

         avio_closep(&pb[0]);

     }
 
     img->img_number++;
     return 0;
 }
 

 #define OFFSET(x) offsetof(VideoMuxData, x)
 #define ENC AV_OPT_FLAG_ENCODING_PARAM
 static const AVOption muxoptions[] = {

     { "updatefirst",  "continuously overwrite one file", OFFSET(update),  AV_OPT_TYPE_INT, { .i64 = 0 }, 0,       1, ENC },

     { "update",       "continuously overwrite one file", OFFSET(update),  AV_OPT_TYPE_INT, { .i64 = 0 }, 0,       1, ENC },

     { "start_number", "set first number in the sequence", OFFSET(img_number), AV_OPT_TYPE_INT,  { .i64 = 1 }, 0, INT_MAX, ENC },

     { "strftime",     "use strftime for filename", OFFSET(use_strftime), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, ENC },

     { NULL },
 };
 

 #if CONFIG_IMAGE2_MUXER

 static const AVClass img2mux_class = {
     .class_name = "image2 muxer",
     .item_name  = av_default_item_name,
     .option     = muxoptions,
     .version    = LIBAVUTIL_VERSION_INT,
 };

 AVOutputFormat ff_image2_muxer = {
     .name           = "image2",
     .long_name      = NULL_IF_CONFIG_SMALL("image2 sequence"),

     .extensions     = "bmp,dpx,jls,jpeg,jpg,ljpg,pam,pbm,pcx,pgm,pgmyuv,png,"

                       "ppm,sgi,tga,tif,tiff,jp2,j2c,j2k,xwd,sun,ras,rs,im1,im8,im24,"

                       "sunras,xbm,xface,pix,y",

     .priv_data_size = sizeof(VideoMuxData),

     .video_codec    = AV_CODEC_ID_MJPEG,

     .write_header   = write_header,
     .write_packet   = write_packet,

     .flags          = AVFMT_NOTIMESTAMPS | AVFMT_NODIMENSIONS | AVFMT_NOFILE,
     .priv_class     = &img2mux_class,

 };
 #endif
 #if CONFIG_IMAGE2PIPE_MUXER
 AVOutputFormat ff_image2pipe_muxer = {
     .name           = "image2pipe",
     .long_name      = NULL_IF_CONFIG_SMALL("piped image2 sequence"),
     .priv_data_size = sizeof(VideoMuxData),

     .video_codec    = AV_CODEC_ID_MJPEG,

     .write_header   = write_header,
     .write_packet   = write_packet,
     .flags          = AVFMT_NOTIMESTAMPS | AVFMT_NODIMENSIONS
 };
 #endif