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
  23 typedef struct RCVContext {
  24     int frames;
  25 } RCVContext;
  26
  27 static int vc1test_write_header(AVFormatContext *s)
  28 {
  29     AVCodecContext *avc = s->streams[0]->codec;
  30     ByteIOContext *pb = s->pb;
  31
  32     if (avc->codec_id != CODEC_ID_WMV3) {
  33         av_log(s, AV_LOG_ERROR, "Only WMV3 is accepted!\n");
  34         return -1;
  35     }
  36     put_le24(pb, 0); //frames count will be here
  37     put_byte(pb, 0xC5);
  38     put_le32(pb, 4);
  39     put_buffer(pb, avc->extradata, 4);
  40     put_le32(pb, avc->height);
  41     put_le32(pb, avc->width);
  42     put_le32(pb, 0xC);
  43     put_le24(pb, 0); // hrd_buffer
  44     put_byte(pb, 0x80); // level|cbr|res1
  45     put_le32(pb, 0); // hrd_rate
  46     if (s->streams[0]->r_frame_rate.den && s->streams[0]->r_frame_rate.num == 1)
  47         put_le32(pb, s->streams[0]->r_frame_rate.den);
  48     else
  49         put_le32(pb, 0xFFFFFFFF); //variable framerate
  50
  51     return 0;
  52 }
  53
  54 static int vc1test_write_packet(AVFormatContext *s, AVPacket *pkt)
  55 {
  56     RCVContext *ctx = s->priv_data;
  57     ByteIOContext *pb = s->pb;
  58
  59     if (!pkt->size)
  60         return 0;
  61     put_le32(pb, pkt->size | ((pkt->flags & PKT_FLAG_KEY) ? 0x80000000 : 0));
  62     put_le32(pb, pkt->pts);
  63     put_buffer(pb, pkt->data, pkt->size);
  64     put_flush_packet(pb);
  65     ctx->frames++;
  66
  67     return 0;
  68 }
  69
  70 static int vc1test_write_trailer(AVFormatContext *s)
  71 {
  72     RCVContext *ctx = s->priv_data;
  73     ByteIOContext *pb = s->pb;
  74
  75     if (!url_is_streamed(s->pb)) {
  76         url_fseek(pb, 0, SEEK_SET);
  77         put_le24(pb, ctx->frames);
  78         put_flush_packet(pb);
  79     }
  80     return 0;
  81 }
  82
  83 AVOutputFormat vc1t_muxer = {
  84     "rcv",
  85     NULL_IF_CONFIG_SMALL("VC-1 test bitstream"),
  86     "",
  87     "rcv",
  88     sizeof(RCVContext),
  89     CODEC_ID_NONE,
  90     CODEC_ID_WMV3,
  91     vc1test_write_header,
  92     vc1test_write_packet,
  93     vc1test_write_trailer,
  94 };