FFmpeg: libavformat/framehash.c Source File

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libavformat

framehash.c

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1 /*

2 * Common functions for the frame{crc,md5} muxers

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 */

21 #include "libavutil/channel_layout.h"

22 #include "internal.h"

23 #include "version.h"

25 int ff_framehash_write_header(AVFormatContext *s)

26 {

27 int i;

29 if (s->nb_streams && !(s->flags & AVFMT_FLAG_BITEXACT))

30 avio_printf(s->pb, "#software: %s\n", LIBAVFORMAT_IDENT);

31 for (i = 0; i < s->nb_streams; i++) {

32 AVStream *st = s->streams[i];

33 AVCodecParameters *avctx = st->codecpar;

34 char buf[256] = { 0 };

35 avio_printf(s->pb, "#tb %d: %d/%d\n", i, st->time_base.num, st->time_base.den);

36 avio_printf(s->pb, "#media_type %d: %s\n", i, av_get_media_type_string(avctx->codec_type));

37 avio_printf(s->pb, "#codec_id %d: %s\n", i, avcodec_get_name(avctx->codec_id));

38 switch (avctx->codec_type) {

39 case AVMEDIA_TYPE_AUDIO: {

40 int ret = av_channel_layout_describe(&avctx->ch_layout, buf, sizeof(buf));

41 if (ret < 0)

42 return ret;

43 avio_printf(s->pb, "#sample_rate %d: %d\n", i,avctx->sample_rate);

44 avio_printf(s->pb, "#channel_layout_name %d: %s\n", i, buf);

45 break;

46 }

47 case AVMEDIA_TYPE_VIDEO:

48 avio_printf(s->pb, "#dimensions %d: %dx%d\n", i, avctx->width, avctx->height);

49 avio_printf(s->pb, "#sar %d: %d/%d\n", i, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);

50 break;

51 }

52 }

53 return 0;

54 }

LIBAVFORMAT_IDENT

#define LIBAVFORMAT_IDENT

Definition: version.h:45

AVCodecParameters::codec_type

enum AVMediaType codec_type

General type of the encoded data.

Definition: codec_par.h:51

AVCodecParameters

This struct describes the properties of an encoded stream.

Definition: codec_par.h:47

AVRational::num

int num

Numerator.

Definition: rational.h:59

av_channel_layout_describe

int av_channel_layout_describe(const AVChannelLayout *channel_layout, char *buf, size_t buf_size)

Get a human-readable string describing the channel layout properties.

Definition: channel_layout.c:648

#define s(width, name)

Definition: cbs_vp9.c:198

AVMEDIA_TYPE_AUDIO

@ AVMEDIA_TYPE_AUDIO

Definition: avutil.h:202

AVCodecParameters::width

int width

Video only.

Definition: codec_par.h:134

AVFormatContext

Format I/O context.

Definition: avformat.h:1287

internal.h

AVStream::codecpar

AVCodecParameters * codecpar

Codec parameters associated with this stream.

Definition: avformat.h:771

AVStream::time_base

AVRational time_base

This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.

Definition: avformat.h:787

AVCodecParameters::ch_layout

AVChannelLayout ch_layout

Audio only.

Definition: codec_par.h:180

AVCodecParameters::sample_rate

int sample_rate

Audio only.

Definition: codec_par.h:184

AVStream::sample_aspect_ratio

AVRational sample_aspect_ratio

sample aspect ratio (0 if unknown)

Definition: avformat.h:826

avcodec_get_name

const char * avcodec_get_name(enum AVCodecID id)

Get the name of a codec.

Definition: utils.c:409

#define i(width, name, range_min, range_max)

Definition: cbs_h2645.c:256

AVCodecParameters::height

int height

Definition: codec_par.h:135

version.h

ret

Definition: filter_design.txt:187

AVFMT_FLAG_BITEXACT

#define AVFMT_FLAG_BITEXACT

When muxing, try to avoid writing any random/volatile data to the output.

Definition: avformat.h:1455

AVStream

Stream structure.

Definition: avformat.h:748

avio_printf

int avio_printf(AVIOContext *s, const char *fmt,...) av_printf_format(2

Writes a formatted string to the context.

av_get_media_type_string

const char * av_get_media_type_string(enum AVMediaType media_type)

Return a string describing the media_type enum, NULL if media_type is unknown.

Definition: utils.c:28

channel_layout.h

AVRational::den

int den

Denominator.

Definition: rational.h:60

AVMEDIA_TYPE_VIDEO

@ AVMEDIA_TYPE_VIDEO

Definition: avutil.h:201

AVCodecParameters::codec_id

enum AVCodecID codec_id

Specific type of the encoded data (the codec used).

Definition: codec_par.h:55

ff_framehash_write_header

int ff_framehash_write_header(AVFormatContext *s)

Set the timebase for each stream from the corresponding codec timebase and print it.

Definition: framehash.c:25

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