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https://github.com/FFmpeg/FFmpeg.git
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3a18d3fa04
At the beginning, the value is not initialized. Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
98 lines
3.0 KiB
C
98 lines
3.0 KiB
C
/*
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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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typedef struct IVFEncContext {
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unsigned frame_cnt;
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uint64_t last_pts, sum_delta_pts;
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} IVFEncContext;
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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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AVIOContext *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 ||
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!(ctx->codec_id == AV_CODEC_ID_VP8 || ctx->codec_id == AV_CODEC_ID_VP9)) {
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av_log(s, AV_LOG_ERROR, "Currently only VP8 and VP9 are supported!\n");
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return AVERROR(EINVAL);
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}
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avio_write(pb, "DKIF", 4);
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avio_wl16(pb, 0); // version
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avio_wl16(pb, 32); // header length
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avio_wl32(pb, ctx->codec_tag ? ctx->codec_tag : ctx->codec_id == AV_CODEC_ID_VP9 ? AV_RL32("VP90") : AV_RL32("VP80"));
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avio_wl16(pb, ctx->width);
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avio_wl16(pb, ctx->height);
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avio_wl32(pb, s->streams[0]->time_base.den);
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avio_wl32(pb, s->streams[0]->time_base.num);
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avio_wl64(pb, 0xFFFFFFFFFFFFFFFFULL);
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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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AVIOContext *pb = s->pb;
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IVFEncContext *ctx = s->priv_data;
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avio_wl32(pb, pkt->size);
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avio_wl64(pb, pkt->pts);
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avio_write(pb, pkt->data, pkt->size);
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if (ctx->frame_cnt)
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ctx->sum_delta_pts += pkt->pts - ctx->last_pts;
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ctx->frame_cnt++;
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ctx->last_pts = pkt->pts;
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return 0;
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}
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static int ivf_write_trailer(AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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if (pb->seekable) {
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IVFEncContext *ctx = s->priv_data;
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size_t end = avio_tell(pb);
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avio_seek(pb, 24, SEEK_SET);
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avio_wl64(pb, ctx->frame_cnt * ctx->sum_delta_pts / (ctx->frame_cnt - 1));
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avio_seek(pb, end, SEEK_SET);
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}
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return 0;
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}
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AVOutputFormat ff_ivf_muxer = {
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.priv_data_size = sizeof(IVFEncContext),
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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 = AV_CODEC_ID_NONE,
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.video_codec = AV_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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.write_trailer = ivf_write_trailer,
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};
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