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https://github.com/FFmpeg/FFmpeg.git
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d3807467b2
There is no change in the encoded bitstream, but this ensures that the written field length is consistent with the reference implementation. Unused bytes are zeroed out for backwards compatibility. Signed-off-by: Raphaël Zumer <rzumer@tebako.net>
128 lines
4.1 KiB
C
128 lines
4.1 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 "internal.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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AVCodecParameters *par;
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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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par = s->streams[0]->codecpar;
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if (par->codec_type != AVMEDIA_TYPE_VIDEO ||
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!(par->codec_id == AV_CODEC_ID_AV1 ||
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par->codec_id == AV_CODEC_ID_VP8 ||
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par->codec_id == AV_CODEC_ID_VP9)) {
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av_log(s, AV_LOG_ERROR, "Currently only VP8, VP9 and AV1 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,
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par->codec_id == AV_CODEC_ID_VP9 ? AV_RL32("VP90") :
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par->codec_id == AV_CODEC_ID_VP8 ? AV_RL32("VP80") : AV_RL32("AV01"));
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avio_wl16(pb, par->width);
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avio_wl16(pb, par->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); // length is overwritten at the end of muxing
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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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IVFEncContext *ctx = s->priv_data;
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if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && ctx->frame_cnt > 1) {
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size_t end = avio_tell(pb);
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avio_seek(pb, 24, SEEK_SET);
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// overwrite the "length" field (duration)
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avio_wl32(pb, ctx->frame_cnt * ctx->sum_delta_pts / (ctx->frame_cnt - 1));
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avio_wl32(pb, 0); // zero out unused bytes
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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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static int ivf_check_bitstream(struct AVFormatContext *s, const AVPacket *pkt)
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{
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int ret = 1;
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AVStream *st = s->streams[pkt->stream_index];
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if (st->codecpar->codec_id == AV_CODEC_ID_VP9)
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ret = ff_stream_add_bitstream_filter(st, "vp9_superframe", NULL);
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else if (st->codecpar->codec_id == AV_CODEC_ID_AV1)
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ret = ff_stream_add_bitstream_filter(st, "av1_metadata", "td=insert");
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return ret;
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}
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static const AVCodecTag codec_ivf_tags[] = {
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{ AV_CODEC_ID_VP8, MKTAG('V', 'P', '8', '0') },
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{ AV_CODEC_ID_VP9, MKTAG('V', 'P', '9', '0') },
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{ AV_CODEC_ID_AV1, MKTAG('A', 'V', '0', '1') },
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{ AV_CODEC_ID_NONE, 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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.check_bitstream = ivf_check_bitstream,
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.codec_tag = (const AVCodecTag* const []){ codec_ivf_tags, 0 },
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};
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