libavformat/vc1testenc.c

   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 #include "mux.h"
  24
  25 typedef struct RCVContext {
  26     int frames;
  27 } RCVContext;
  28
  29 static int vc1test_write_header(AVFormatContext *s)
  30 {
  31     AVCodecParameters *par = s->streams[0]->codecpar;
  32     AVIOContext *pb = s->pb;
  33
  34     avio_wl24(pb, 0); //frames count will be here
  35     avio_w8(pb, 0xC5);
  36     avio_wl32(pb, 4);
  37     avio_write(pb, par->extradata, 4);
  38     avio_wl32(pb, par->height);
  39     avio_wl32(pb, par->width);
  40     avio_wl32(pb, 0xC);
  41     avio_wl24(pb, 0); // hrd_buffer
  42     avio_w8(pb, 0x80); // level|cbr|res1
  43     avio_wl32(pb, 0); // hrd_rate
  44     if (s->streams[0]->avg_frame_rate.den && s->streams[0]->avg_frame_rate.num == 1)
  45         avio_wl32(pb, s->streams[0]->avg_frame_rate.den);
  46     else
  47         avio_wl32(pb, 0xFFFFFFFF); //variable framerate
  48     avpriv_set_pts_info(s->streams[0], 32, 1, 1000);
  49
  50     return 0;
  51 }
  52
  53 static int vc1test_write_packet(AVFormatContext *s, AVPacket *pkt)
  54 {
  55     RCVContext *ctx = s->priv_data;
  56     AVIOContext *pb = s->pb;
  57
  58     if (!pkt->size)
  59         return 0;
  60     avio_wl32(pb, pkt->size | ((pkt->flags & AV_PKT_FLAG_KEY) ? 0x80000000 : 0));
  61     avio_wl32(pb, pkt->pts);
  62     avio_write(pb, pkt->data, pkt->size);
  63     ctx->frames++;
  64
  65     return 0;
  66 }
  67
  68 static int vc1test_write_trailer(AVFormatContext *s)
  69 {
  70     RCVContext *ctx = s->priv_data;
  71     AVIOContext *pb = s->pb;
  72
  73     if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
  74         avio_seek(pb, 0, SEEK_SET);
  75         avio_wl24(pb, ctx->frames);
  76     }
  77     return 0;
  78 }
  79
  80 const FFOutputFormat ff_vc1t_muxer = {
  81     .p.name            = "vc1test",
  82     .p.long_name       = NULL_IF_CONFIG_SMALL("VC-1 test bitstream"),
  83     .p.extensions      = "rcv",
  84     .priv_data_size    = sizeof(RCVContext),
  85     .p.audio_codec     = AV_CODEC_ID_NONE,
  86     .p.video_codec     = AV_CODEC_ID_WMV3,
  87     .p.subtitle_codec  = AV_CODEC_ID_NONE,
  88     .write_header      = vc1test_write_header,
  89     .write_packet      = vc1test_write_packet,
  90     .write_trailer     = vc1test_write_trailer,
  91     .flags_internal    = FF_OFMT_FLAG_MAX_ONE_OF_EACH |
  92                          FF_OFMT_FLAG_ONLY_DEFAULT_CODECS,
  93 };