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ffmpeg / libavformat / ivfenc.c @ b2ed95ec

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/*
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 * Copyright (c) 2010 Reimar Döffinger
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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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#include "libavutil/intreadwrite.h"
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static int ivf_write_header(AVFormatContext *s)
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{
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    AVCodecContext *ctx;
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    ByteIOContext *pb = s->pb;
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    if (s->nb_streams != 1) {
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        av_log(s, AV_LOG_ERROR, "Format supports only exactly one video stream\n");
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        return AVERROR(EINVAL);
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    }
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    ctx = s->streams[0]->codec;
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    if (ctx->codec_type != AVMEDIA_TYPE_VIDEO || ctx->codec_id != CODEC_ID_VP8) {
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        av_log(s, AV_LOG_ERROR, "Currently only VP8 is supported!\n");
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        return AVERROR(EINVAL);
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    }
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    put_buffer(pb, "DKIF", 4);
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    put_le16(pb, 0); // version
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    put_le16(pb, 32); // header length
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    put_le32(pb, ctx->codec_tag ? ctx->codec_tag : AV_RL32("VP80"));
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    put_le16(pb, ctx->width);
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    put_le16(pb, ctx->height);
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    put_le32(pb, s->streams[0]->time_base.den);
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    put_le32(pb, s->streams[0]->time_base.num);
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    put_le64(pb, s->streams[0]->duration); // TODO: duration or number of frames?!?
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    return 0;
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}
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static int ivf_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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    ByteIOContext *pb = s->pb;
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    put_le32(pb, pkt->size);
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    put_le64(pb, pkt->pts);
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    put_buffer(pb, pkt->data, pkt->size);
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    put_flush_packet(pb);
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    return 0;
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}
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AVOutputFormat ff_ivf_muxer = {
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    .name = "ivf",
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    .long_name = NULL_IF_CONFIG_SMALL("On2 IVF"),
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    .extensions = "ivf",
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    .audio_codec = CODEC_ID_NONE,
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    .video_codec = CODEC_ID_VP8,
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    .write_header = ivf_write_header,
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    .write_packet = ivf_write_packet,
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};