path: root/libavformat/ivfenc.c (plain)
blob: fdc0ee03e1640c663aafe7e9e6915d31e3859e34

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"
21	#include "internal.h"
22	#include "libavutil/intreadwrite.h"
23
24	typedef struct IVFEncContext {
25	unsigned frame_cnt;
26	uint64_t last_pts, sum_delta_pts;
27	} IVFEncContext;
28
29	static int ivf_write_header(AVFormatContext *s)
30	{
31	AVCodecParameters *par;
32	AVIOContext *pb = s->pb;
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	par = s->streams[0]->codecpar;
39	if (par->codec_type != AVMEDIA_TYPE_VIDEO ||
40	!(par->codec_id == AV_CODEC_ID_VP8 || par->codec_id == AV_CODEC_ID_VP9)) {
41	av_log(s, AV_LOG_ERROR, "Currently only VP8 and VP9 are supported!\n");
42	return AVERROR(EINVAL);
43	}
44	avio_write(pb, "DKIF", 4);
45	avio_wl16(pb, 0); // version
46	avio_wl16(pb, 32); // header length
47	avio_wl32(pb, par->codec_tag ? par->codec_tag : par->codec_id == AV_CODEC_ID_VP9 ? AV_RL32("VP90") : AV_RL32("VP80"));
48	avio_wl16(pb, par->width);
49	avio_wl16(pb, par->height);
50	avio_wl32(pb, s->streams[0]->time_base.den);
51	avio_wl32(pb, s->streams[0]->time_base.num);
52	avio_wl64(pb, 0xFFFFFFFFFFFFFFFFULL);
53
54	return 0;
55	}
56
57	static int ivf_write_packet(AVFormatContext *s, AVPacket *pkt)
58	{
59	AVIOContext *pb = s->pb;
60	IVFEncContext *ctx = s->priv_data;
61
62	avio_wl32(pb, pkt->size);
63	avio_wl64(pb, pkt->pts);
64	avio_write(pb, pkt->data, pkt->size);
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
73	static int ivf_write_trailer(AVFormatContext *s)
74	{
75	AVIOContext *pb = s->pb;
76	IVFEncContext *ctx = s->priv_data;
77
78	if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && ctx->frame_cnt > 1) {
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	}
85
86	return 0;
87	}
88
89	static 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->codecpar->codec_id == AV_CODEC_ID_VP9)
95	ret = ff_stream_add_bitstream_filter(st, "vp9_superframe", NULL);
96
97	return ret;
98	}
99
100	static const AVCodecTag codec_ivf_tags[] = {
101	{ AV_CODEC_ID_VP8, MKTAG('V', 'P', '8', '0') },
102	{ AV_CODEC_ID_VP9, MKTAG('V', 'P', '9', '0') },
103	{ AV_CODEC_ID_NONE, 0 }
104	};
105
106	AVOutputFormat ff_ivf_muxer = {
107	.priv_data_size = sizeof(IVFEncContext),
108	.name = "ivf",
109	.long_name = NULL_IF_CONFIG_SMALL("On2 IVF"),
110	.extensions = "ivf",
111	.audio_codec = AV_CODEC_ID_NONE,
112	.video_codec = AV_CODEC_ID_VP8,
113	.write_header = ivf_write_header,
114	.write_packet = ivf_write_packet,
115	.write_trailer = ivf_write_trailer,
116	.check_bitstream = ivf_check_bitstream,
117	.codec_tag = (const AVCodecTag* const []){ codec_ivf_tags, 0 },
118	};
119