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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"
21 #include "libavutil/intreadwrite.h"
22 
23 typedef struct IVFEncContext {
24  unsigned frame_cnt;
27 
29 {
30  AVCodecContext *ctx;
31  AVIOContext *pb = s->pb;
32 
33  if (s->nb_streams != 1) {
34  av_log(s, AV_LOG_ERROR, "Format supports only exactly one video stream\n");
35  return AVERROR(EINVAL);
36  }
37  ctx = s->streams[0]->codec;
38  if (ctx->codec_type != AVMEDIA_TYPE_VIDEO ||
39  !(ctx->codec_id == AV_CODEC_ID_VP8 || ctx->codec_id == AV_CODEC_ID_VP9)) {
40  av_log(s, AV_LOG_ERROR, "Currently only VP8 and VP9 are supported!\n");
41  return AVERROR(EINVAL);
42  }
43  avio_write(pb, "DKIF", 4);
44  avio_wl16(pb, 0); // version
45  avio_wl16(pb, 32); // header length
46  avio_wl32(pb, ctx->codec_tag ? ctx->codec_tag : ctx->codec_id == AV_CODEC_ID_VP9 ? AV_RL32("VP90") : AV_RL32("VP80"));
47  avio_wl16(pb, ctx->width);
48  avio_wl16(pb, ctx->height);
49  avio_wl32(pb, s->streams[0]->time_base.den);
50  avio_wl32(pb, s->streams[0]->time_base.num);
51  avio_wl64(pb, 0xFFFFFFFFFFFFFFFFULL);
52 
53  return 0;
54 }
55 
57 {
58  AVIOContext *pb = s->pb;
59  IVFEncContext *ctx = s->priv_data;
60 
61  avio_wl32(pb, pkt->size);
62  avio_wl64(pb, pkt->pts);
63  avio_write(pb, pkt->data, pkt->size);
64  if (ctx->frame_cnt)
65  ctx->sum_delta_pts += pkt->pts - ctx->last_pts;
66  ctx->frame_cnt++;
67  ctx->last_pts = pkt->pts;
68 
69  return 0;
70 }
71 
73 {
74  AVIOContext *pb = s->pb;
75  if (pb->seekable) {
76  IVFEncContext *ctx = s->priv_data;
77  size_t end = avio_tell(pb);
78 
79  avio_seek(pb, 24, SEEK_SET);
80  avio_wl64(pb, ctx->frame_cnt * ctx->sum_delta_pts / (ctx->frame_cnt - 1));
81  avio_seek(pb, end, SEEK_SET);
82  }
83 
84  return 0;
85 }
86 
88  .priv_data_size = sizeof(IVFEncContext),
89  .name = "ivf",
90  .long_name = NULL_IF_CONFIG_SMALL("On2 IVF"),
91  .extensions = "ivf",
92  .audio_codec = AV_CODEC_ID_NONE,
93  .video_codec = AV_CODEC_ID_VP8,
94  .write_header = ivf_write_header,
95  .write_packet = ivf_write_packet,
96  .write_trailer = ivf_write_trailer,
97 };
void avio_wl16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:417
const char * s
Definition: avisynth_c.h:631
Bytestream IO Context.
Definition: avio.h:111
static int ivf_write_header(AVFormatContext *s)
Definition: ivfenc.c:28
int num
numerator
Definition: rational.h:44
int size
Definition: avcodec.h:1423
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:204
AVOutputFormat ff_ivf_muxer
Definition: ivfenc.c:87
static AVPacket pkt
static int ivf_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: ivfenc.c:56
Format I/O context.
Definition: avformat.h:1272
void avio_wl32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:319
int priv_data_size
size of private data so that it can be allocated in the wrapper
Definition: avformat.h:554
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1340
uint8_t * data
Definition: avcodec.h:1422
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:390
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:178
#define av_log(a,...)
void avio_wl64(AVIOContext *s, uint64_t val)
Definition: aviobuf.c:405
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:175
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:861
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1328
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:160
int width
picture width / height.
Definition: avcodec.h:1680
static int ivf_write_trailer(AVFormatContext *s)
Definition: ivfenc.c:72
uint64_t sum_delta_pts
Definition: ivfenc.c:25
enum AVMediaType codec_type
Definition: avcodec.h:1509
enum AVCodecID codec_id
Definition: avcodec.h:1518
AVIOContext * pb
I/O context.
Definition: avformat.h:1314
main external API structure.
Definition: avcodec.h:1501
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1533
unsigned frame_cnt
Definition: ivfenc.c:24
Main libavformat public API header.
int den
denominator
Definition: rational.h:45
uint64_t last_pts
Definition: ivfenc.c:25
void * priv_data
Format private data.
Definition: avformat.h:1300
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:884
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1399
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1415
const char * name
Definition: opengl_enc.c:103