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  1. /*
  2.  * VC-1 test bitstreams format muxer.
  3.  * Copyright (c) 2008 Konstantin Shishkov
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21. #include "avformat.h"
  22. #include "internal.h"
  23.  
  24. typedef struct RCVContext {
  25.     int frames;
  26. } RCVContext;
  27.  
  28. static int vc1test_write_header(AVFormatContext *s)
  29. {
  30.     AVCodecContext *avc = s->streams[0]->codec;
  31.     AVIOContext *pb = s->pb;
  32.  
  33.     if (avc->codec_id != AV_CODEC_ID_WMV3) {
  34.         av_log(s, AV_LOG_ERROR, "Only WMV3 is accepted!\n");
  35.         return -1;
  36.     }
  37.     avio_wl24(pb, 0); //frames count will be here
  38.     avio_w8(pb, 0xC5);
  39.     avio_wl32(pb, 4);
  40.     avio_write(pb, avc->extradata, 4);
  41.     avio_wl32(pb, avc->height);
  42.     avio_wl32(pb, avc->width);
  43.     avio_wl32(pb, 0xC);
  44.     avio_wl24(pb, 0); // hrd_buffer
  45.     avio_w8(pb, 0x80); // level|cbr|res1
  46.     avio_wl32(pb, 0); // hrd_rate
  47.     if (s->streams[0]->avg_frame_rate.den && s->streams[0]->avg_frame_rate.num == 1)
  48.         avio_wl32(pb, s->streams[0]->avg_frame_rate.den);
  49.     else
  50.         avio_wl32(pb, 0xFFFFFFFF); //variable framerate
  51.     avpriv_set_pts_info(s->streams[0], 32, 1, 1000);
  52.  
  53.     return 0;
  54. }
  55.  
  56. static int vc1test_write_packet(AVFormatContext *s, AVPacket *pkt)
  57. {
  58.     RCVContext *ctx = s->priv_data;
  59.     AVIOContext *pb = s->pb;
  60.  
  61.     if (!pkt->size)
  62.         return 0;
  63.     avio_wl32(pb, pkt->size | ((pkt->flags & AV_PKT_FLAG_KEY) ? 0x80000000 : 0));
  64.     avio_wl32(pb, pkt->pts);
  65.     avio_write(pb, pkt->data, pkt->size);
  66.     ctx->frames++;
  67.  
  68.     return 0;
  69. }
  70.  
  71. static int vc1test_write_trailer(AVFormatContext *s)
  72. {
  73.     RCVContext *ctx = s->priv_data;
  74.     AVIOContext *pb = s->pb;
  75.  
  76.     if (s->pb->seekable) {
  77.         avio_seek(pb, 0, SEEK_SET);
  78.         avio_wl24(pb, ctx->frames);
  79.         avio_flush(pb);
  80.     }
  81.     return 0;
  82. }
  83.  
  84. AVOutputFormat ff_vc1t_muxer = {
  85.     .name              = "vc1test",
  86.     .long_name         = NULL_IF_CONFIG_SMALL("VC-1 test bitstream"),
  87.     .extensions        = "rcv",
  88.     .priv_data_size    = sizeof(RCVContext),
  89.     .audio_codec       = AV_CODEC_ID_NONE,
  90.     .video_codec       = AV_CODEC_ID_WMV3,
  91.     .write_header      = vc1test_write_header,
  92.     .write_packet      = vc1test_write_packet,
  93.     .write_trailer     = vc1test_write_trailer,
  94. };
  95.