FFmpeg: libavformat/framecrcenc.c Source File

FFmpeg
framecrcenc.c
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1 /*
2  * frame CRC encoder (for codec/format testing)
3  * Copyright (c) 2002 Fabrice Bellard
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include <inttypes.h>
23 
24 #include "libavutil/adler32.h"
25 #include "libavutil/avstring.h"
26 
27 #include "libavcodec/codec_id.h"
28 #include "libavcodec/codec_par.h"
29 #include "libavcodec/packet.h"
30 
31 #include "avformat.h"
32 #include "internal.h"
33 #include "mux.h"
34 
35  static int framecrc_write_header(struct AVFormatContext *s)
36 {
37  int i;
38  for (i = 0; i < s->nb_streams; i++) {
39  AVStream *st = s->streams[i];
40  AVCodecParameters *par = st->codecpar;
41  if (par->extradata) {
42  uint32_t crc = av_adler32_update(0, par->extradata, par->extradata_size);
43  avio_printf(s->pb, "#extradata %d: %8d, 0x%08"PRIx32"\n",
44  i, par->extradata_size, crc);
45  }
46  }
47 
48  return ff_framehash_write_header(s);
49 }
50 
51  static int framecrc_write_packet(struct AVFormatContext *s, AVPacket *pkt)
52 {
53  uint32_t crc = av_adler32_update(0, pkt->data, pkt->size);
54  char buf[256];
55 
56  snprintf(buf, sizeof(buf), "%d, %10"PRId64", %10"PRId64", %8"PRId64", %8d, 0x%08"PRIx32,
57  pkt->stream_index, pkt->dts, pkt->pts, pkt->duration, pkt->size, crc);
58  if (pkt->flags != AV_PKT_FLAG_KEY)
59  av_strlcatf(buf, sizeof(buf), ", F=0x%0X", pkt->flags);
60  if (pkt->side_data_elems) {
61  av_strlcatf(buf, sizeof(buf), ", S=%d", pkt->side_data_elems);
62 
63  for (int i = 0; i < pkt->side_data_elems; i++) {
64  av_strlcatf(buf, sizeof(buf), ", %8"SIZE_SPECIFIER,
65  pkt->side_data[i].size);
66  }
67  }
68  av_strlcatf(buf, sizeof(buf), "\n");
69  avio_write(s->pb, buf, strlen(buf));
70  return 0;
71 }
72 
73  const FFOutputFormat ff_framecrc_muxer = {
74  .p.name = "framecrc",
75  .p.long_name = NULL_IF_CONFIG_SMALL("framecrc testing"),
76  .p.audio_codec = AV_CODEC_ID_PCM_S16LE,
77  .p.video_codec = AV_CODEC_ID_RAWVIDEO,
78  .write_header = framecrc_write_header,
79  .write_packet = framecrc_write_packet,
80  .p.flags = AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT |
81  AVFMT_TS_NEGATIVE,
82 };
AV_CODEC_ID_PCM_S16LE
@ AV_CODEC_ID_PCM_S16LE
Definition: codec_id.h:326
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:76
AVOutputFormat::name
const char * name
Definition: avformat.h:508
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:54
AVFMT_VARIABLE_FPS
#define AVFMT_VARIABLE_FPS
Format allows variable fps.
Definition: avformat.h:482
AV_CODEC_ID_RAWVIDEO
@ AV_CODEC_ID_RAWVIDEO
Definition: codec_id.h:65
AVPacket::data
uint8_t * data
Definition: packet.h:374
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:392
av_strlcatf
size_t av_strlcatf(char *dst, size_t size, const char *fmt,...)
Definition: avstring.c:104
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:429
FFOutputFormat::p
AVOutputFormat p
The public AVOutputFormat.
Definition: mux.h:34
AVPacketSideData::size
size_t size
Definition: packet.h:317
pkt
AVPacket * pkt
Definition: movenc.c:59
codec_id.h
framecrc_write_packet
static int framecrc_write_packet(struct AVFormatContext *s, AVPacket *pkt)
Definition: framecrcenc.c:51
s
#define s(width, name)
Definition: cbs_vp9.c:256
AVFormatContext
Format I/O context.
Definition: avformat.h:1104
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:861
framecrc_write_header
static int framecrc_write_header(struct AVFormatContext *s)
Definition: framecrcenc.c:35
FFOutputFormat
Definition: mux.h:30
adler32.h
av_adler32_update
AVAdler av_adler32_update(AVAdler adler, const uint8_t *buf, size_t len)
Calculate the Adler32 checksum of a buffer.
Definition: adler32.c:44
AVCodecParameters::extradata_size
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:80
AVPacket::size
int size
Definition: packet.h:375
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:115
AVPacket::dts
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed.
Definition: packet.h:373
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:222
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:380
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:367
packet.h
AVFMT_TS_NEGATIVE
#define AVFMT_TS_NEGATIVE
Format allows muxing negative timestamps.
Definition: avformat.h:492
AVFMT_TS_NONSTRICT
#define AVFMT_TS_NONSTRICT
Format does not require strictly increasing timestamps, but they must still be monotonic.
Definition: avformat.h:489
AVStream
Stream structure.
Definition: avformat.h:838
ff_framecrc_muxer
const FFOutputFormat ff_framecrc_muxer
Definition: framecrcenc.c:73
avformat.h
AVPacket::side_data
AVPacketSideData * side_data
Additional packet data that can be provided by the container.
Definition: packet.h:385
SIZE_SPECIFIER
#define SIZE_SPECIFIER
Definition: internal.h:150
avio_printf
int avio_printf(AVIOContext *s, const char *fmt,...) av_printf_format(2
Writes a formatted string to the context.
AVPacket::stream_index
int stream_index
Definition: packet.h:376
codec_par.h
AVPacket
This structure stores compressed data.
Definition: packet.h:351
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
avstring.h
snprintf
#define snprintf
Definition: snprintf.h:34
AVPacket::side_data_elems
int side_data_elems
Definition: packet.h:386
mux.h
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