FFmpeg: libavformat/ivfenc.c Source File
Go to the documentation of this file. 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 */
24
29
31 {
33
34 if (
s->nb_streams != 1) {
37 }
38 par =
s->streams[0]->codecpar;
45 }
46
55 }
56
57 return 0;
58 }
59
61 {
64
75 avio_wl64(pb, 0xFFFFFFFFFFFFFFFFULL);
// length is overwritten at the end of muxing
76
77 return 0;
78 }
79
81 {
84
93
94 return 0;
95 }
96
98 {
101
103 (
ctx->frame_cnt > 1 || (
ctx->frame_cnt == 1 &&
ctx->last_pkt_duration))) {
105
107 // overwrite the "length" field (duration)
109 ctx->sum_delta_pts +
ctx->last_pkt_duration :
110 ctx->frame_cnt *
ctx->sum_delta_pts / (
ctx->frame_cnt - 1));
111 avio_wl32(pb, 0);
// zero out unused bytes
113 }
114
115 return 0;
116 }
117
123 };
124
128 .p.extensions = "ivf",
137 };
static int ivf_write_trailer(AVFormatContext *s)
static int ivf_init(AVFormatContext *s)
Filter the word "frame" indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
enum AVMediaType codec_type
General type of the encoded data.
This struct describes the properties of an encoded stream.
static const AVCodecTag codec_ivf_tags[]
void avio_wl64(AVIOContext *s, uint64_t val)
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
void avio_wl16(AVIOContext *s, unsigned int val)
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
int(* init)(AVBSFContext *ctx)
uint64_t last_pkt_duration
static int write_trailer(AVFormatContext *s1)
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
static int ivf_write_header(AVFormatContext *s)
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
void avio_wl32(AVIOContext *s, unsigned int val)
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
static int write_packet(Muxer *mux, OutputStream *ost, AVPacket *pkt)
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
static int ivf_write_packet(AVFormatContext *s, AVPacket *pkt)
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
This structure stores compressed data.
#define MKTAG(a, b, c, d)
static void write_header(FFV1Context *f)
const FFOutputFormat ff_ivf_muxer
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