vp9: add superframe merging bitstream filter.
[libav.git] / libavformat / ivfenc.c
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1/*
2 * Copyright (c) 2010 Reimar Döffinger
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20#include "avformat.h"
2e6636aa 21#include "internal.h"
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22#include "libavutil/intreadwrite.h"
23
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24typedef struct IVFEncContext {
25 unsigned frame_cnt;
26 uint64_t last_pts, sum_delta_pts;
27} IVFEncContext;
28
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29static int ivf_write_header(AVFormatContext *s)
30{
31 AVCodecContext *ctx;
ae628ec1 32 AVIOContext *pb = s->pb;
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33
34 if (s->nb_streams != 1) {
35 av_log(s, AV_LOG_ERROR, "Format supports only exactly one video stream\n");
36 return AVERROR(EINVAL);
37 }
38 ctx = s->streams[0]->codec;
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39 if (ctx->codec_type != AVMEDIA_TYPE_VIDEO ||
40 !(ctx->codec_id == AV_CODEC_ID_VP8 || ctx->codec_id == AV_CODEC_ID_VP9)) {
41 av_log(s, AV_LOG_ERROR, "Currently only VP8 and VP9 are supported!\n");
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42 return AVERROR(EINVAL);
43 }
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44 avio_write(pb, "DKIF", 4);
45 avio_wl16(pb, 0); // version
46 avio_wl16(pb, 32); // header length
2db24cf7 47 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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48 avio_wl16(pb, ctx->width);
49 avio_wl16(pb, ctx->height);
50 avio_wl32(pb, s->streams[0]->time_base.den);
51 avio_wl32(pb, s->streams[0]->time_base.num);
3a18d3fa 52 avio_wl64(pb, 0xFFFFFFFFFFFFFFFFULL);
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53
54 return 0;
55}
56
57static int ivf_write_packet(AVFormatContext *s, AVPacket *pkt)
58{
ae628ec1 59 AVIOContext *pb = s->pb;
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60 IVFEncContext *ctx = s->priv_data;
61
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62 avio_wl32(pb, pkt->size);
63 avio_wl64(pb, pkt->pts);
64 avio_write(pb, pkt->data, pkt->size);
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65 if (ctx->frame_cnt)
66 ctx->sum_delta_pts += pkt->pts - ctx->last_pts;
67 ctx->frame_cnt++;
68 ctx->last_pts = pkt->pts;
69
70 return 0;
71}
72
73static int ivf_write_trailer(AVFormatContext *s)
74{
75 AVIOContext *pb = s->pb;
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76 IVFEncContext *ctx = s->priv_data;
77
78 if (pb->seekable && ctx->frame_cnt > 1) {
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79 size_t end = avio_tell(pb);
80
81 avio_seek(pb, 24, SEEK_SET);
82 avio_wl64(pb, ctx->frame_cnt * ctx->sum_delta_pts / (ctx->frame_cnt - 1));
83 avio_seek(pb, end, SEEK_SET);
84 }
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85
86 return 0;
87}
88
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89static int ivf_check_bitstream(struct AVFormatContext *s, const AVPacket *pkt)
90{
91 int ret = 1;
92 AVStream *st = s->streams[pkt->stream_index];
93
94 if (st->codec->codec_id == AV_CODEC_ID_VP9)
95 ret = ff_stream_add_bitstream_filter(st, "vp9_superframe", NULL);
96
97 return ret;
98}
99
c6610a21 100AVOutputFormat ff_ivf_muxer = {
3a18d3fa 101 .priv_data_size = sizeof(IVFEncContext),
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102 .name = "ivf",
103 .long_name = NULL_IF_CONFIG_SMALL("On2 IVF"),
104 .extensions = "ivf",
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105 .audio_codec = AV_CODEC_ID_NONE,
106 .video_codec = AV_CODEC_ID_VP8,
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107 .write_header = ivf_write_header,
108 .write_packet = ivf_write_packet,
3a18d3fa 109 .write_trailer = ivf_write_trailer,
2e6636aa 110 .check_bitstream = ivf_check_bitstream,
326851b9 111};