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ffmpeg / libavformat / vc1testenc.c @ f59d8ff8

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/*
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 * VC-1 test bitstreams format muxer.
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 * Copyright (c) 2008 Konstantin Shishkov
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "avformat.h"
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typedef struct RCVContext {
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    int frames;
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} RCVContext;
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static int vc1test_write_header(AVFormatContext *s)
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{
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    AVCodecContext *avc = s->streams[0]->codec;
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    AVIOContext *pb = s->pb;
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    if (avc->codec_id != CODEC_ID_WMV3) {
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        av_log(s, AV_LOG_ERROR, "Only WMV3 is accepted!\n");
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        return -1;
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    }
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    avio_wl24(pb, 0); //frames count will be here
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    avio_w8(pb, 0xC5);
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    avio_wl32(pb, 4);
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    avio_write(pb, avc->extradata, 4);
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    avio_wl32(pb, avc->height);
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    avio_wl32(pb, avc->width);
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    avio_wl32(pb, 0xC);
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    avio_wl24(pb, 0); // hrd_buffer
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    avio_w8(pb, 0x80); // level|cbr|res1
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    avio_wl32(pb, 0); // hrd_rate
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    if (s->streams[0]->r_frame_rate.den && s->streams[0]->r_frame_rate.num == 1)
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        avio_wl32(pb, s->streams[0]->r_frame_rate.den);
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    else
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        avio_wl32(pb, 0xFFFFFFFF); //variable framerate
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    av_set_pts_info(s->streams[0], 32, 1, 1000);
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    return 0;
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}
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static int vc1test_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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    RCVContext *ctx = s->priv_data;
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    AVIOContext *pb = s->pb;
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    if (!pkt->size)
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        return 0;
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    avio_wl32(pb, pkt->size | ((pkt->flags & AV_PKT_FLAG_KEY) ? 0x80000000 : 0));
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    avio_wl32(pb, pkt->pts);
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    avio_write(pb, pkt->data, pkt->size);
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    put_flush_packet(pb);
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    ctx->frames++;
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    return 0;
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}
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static int vc1test_write_trailer(AVFormatContext *s)
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{
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    RCVContext *ctx = s->priv_data;
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    AVIOContext *pb = s->pb;
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    if (!url_is_streamed(s->pb)) {
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        avio_seek(pb, 0, SEEK_SET);
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        avio_wl24(pb, ctx->frames);
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        put_flush_packet(pb);
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    }
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    return 0;
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}
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AVOutputFormat ff_vc1t_muxer = {
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    "rcv",
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    NULL_IF_CONFIG_SMALL("VC-1 test bitstream"),
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    "",
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    "rcv",
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    sizeof(RCVContext),
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    CODEC_ID_NONE,
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    CODEC_ID_WMV3,
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    vc1test_write_header,
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    vc1test_write_packet,
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    vc1test_write_trailer,
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};