/*
  * Adobe Filmstrip muxer
  * Copyright (c) 2010 Peter Ross
  *
  * 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

  * Adobe Filmstrip muxer
  */
 
 #include "libavutil/intreadwrite.h"
 #include "avformat.h"
 
 #define RAND_TAG MKBETAG('R','a','n','d')
 
 typedef struct {
     int nb_frames;
 } FilmstripMuxContext;
 
 static int write_header(AVFormatContext *s)
 {

     if (s->streams[0]->codec->pix_fmt != AV_PIX_FMT_RGBA) {
         av_log(s, AV_LOG_ERROR, "only AV_PIX_FMT_RGBA is supported\n");

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

     avio_write(s->pb, pkt->data, pkt->size);

     film->nb_frames++;
     return 0;
 }
 
 static int write_trailer(AVFormatContext *s)
 {
     FilmstripMuxContext *film = s->priv_data;

     AVIOContext *pb = s->pb;

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

     avio_wb32(pb, RAND_TAG);
     avio_wb32(pb, film->nb_frames);
     avio_wb16(pb, 0);  // packing method
     avio_wb16(pb, 0);  // reserved
     avio_wb16(pb, st->codec->width);
     avio_wb16(pb, st->codec->height);
     avio_wb16(pb, 0);  // leading

     avio_wb16(pb, st->codec->time_base.den / st->codec->time_base.num);

     for (i = 0; i < 16; i++)

         avio_w8(pb, 0x00);  // reserved

     return 0;
 }
 

 AVOutputFormat ff_filmstrip_muxer = {

     .name              = "filmstrip",
     .long_name         = NULL_IF_CONFIG_SMALL("Adobe Filmstrip"),
     .extensions        = "flm",
     .priv_data_size    = sizeof(FilmstripMuxContext),

     .audio_codec       = AV_CODEC_ID_NONE,
     .video_codec       = AV_CODEC_ID_RAWVIDEO,

     .write_header      = write_header,
     .write_packet      = write_packet,
     .write_trailer     = write_trailer,

 };