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 #include "avformat.h"
27 #include "internal.h"
28 
29  static int framecrc_write_header(struct AVFormatContext *s)
30 {
31  int i;
32  for (i = 0; i < s->nb_streams; i++) {
33  AVStream *st = s->streams[i];
34  AVCodecParameters *par = st->codecpar;
35  if (par->extradata) {
36  uint32_t crc = av_adler32_update(0, par->extradata, par->extradata_size);
37  avio_printf(s->pb, "#extradata %d: %8d, 0x%08"PRIx32"\n",
38  i, par->extradata_size, crc);
39  }
40  }
41 
42  return ff_framehash_write_header(s);
43 }
44 
45  static int framecrc_write_packet(struct AVFormatContext *s, AVPacket *pkt)
46 {
47  uint32_t crc = av_adler32_update(0, pkt->data, pkt->size);
48  char buf[256];
49 
50  snprintf(buf, sizeof(buf), "%d, %10"PRId64", %10"PRId64", %8"PRId64", %8d, 0x%08"PRIx32,
51  pkt->stream_index, pkt->dts, pkt->pts, pkt->duration, pkt->size, crc);
52  if (pkt->flags != AV_PKT_FLAG_KEY)
53  av_strlcatf(buf, sizeof(buf), ", F=0x%0X", pkt->flags);
54  if (pkt->side_data_elems) {
55  int i, j;
56  av_strlcatf(buf, sizeof(buf), ", S=%d", pkt->side_data_elems);
57 
58  for (i=0; i<pkt->side_data_elems; i++) {
59  uint32_t side_data_crc = 0;
60  if (HAVE_BIGENDIAN && AV_PKT_DATA_PALETTE == pkt->side_data[i].type) {
61  for (j=0; j<pkt->side_data[i].size; j++) {
62  side_data_crc = av_adler32_update(side_data_crc,
63  pkt->side_data[i].data + (j^3),
64  1);
65  }
66  } else {
67  side_data_crc = av_adler32_update(0,
68  pkt->side_data[i].data,
69  pkt->side_data[i].size);
70  }
71  av_strlcatf(buf, sizeof(buf), ", %8d, 0x%08"PRIx32, pkt->side_data[i].size, side_data_crc);
72  }
73  }
74  av_strlcatf(buf, sizeof(buf), "\n");
75  avio_write(s->pb, buf, strlen(buf));
76  return 0;
77 }
78 
79  AVOutputFormat ff_framecrc_muxer = {
80  .name = "framecrc",
81  .long_name = NULL_IF_CONFIG_SMALL("framecrc testing"),
82  .audio_codec = AV_CODEC_ID_PCM_S16LE,
83  .video_codec = AV_CODEC_ID_RAWVIDEO,
84  .write_header = framecrc_write_header,
85  .write_packet = framecrc_write_packet,
86  .flags = AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT |
87  AVFMT_TS_NEGATIVE,
88 };
s
const char * s
Definition: avisynth_c.h:768
framecrc_write_header
static int framecrc_write_header(struct AVFormatContext *s)
Definition: framecrcenc.c:29
AVPacket::size
int size
Definition: avcodec.h:1431
pkt
static AVPacket pkt
Definition: demuxing_decoding.c:54
AVFMT_TS_NONSTRICT
#define AVFMT_TS_NONSTRICT
Format does not require strictly increasing timestamps, but they must still be monotonic.
Definition: avformat.h:479
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3876
AVFormatContext
Format I/O context.
Definition: avformat.h:1342
framecrc_write_packet
static int framecrc_write_packet(struct AVFormatContext *s, AVPacket *pkt)
Definition: framecrcenc.c:45
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1448
av_adler32_update
unsigned long av_adler32_update(unsigned long adler, const uint8_t *buf, unsigned int len)
Calculate the Adler32 checksum of a buffer.
Definition: adler32.c:44
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1410
AVPacket::data
uint8_t * data
Definition: avcodec.h:1430
AVPacketSideData::data
uint8_t * data
Definition: avcodec.h:1374
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:218
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1462
AV_PKT_DATA_PALETTE
An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE bytes worth of palette...
Definition: avcodec.h:1149
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:186
AVPacketSideData::type
enum AVPacketSideDataType type
Definition: avcodec.h:1376
AVPacket::side_data_elems
int side_data_elems
Definition: avcodec.h:1442
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1436
AVCodecParameters::extradata_size
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3902
AVFormatContext::nb_streams
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1398
AVOutputFormat::name
const char * name
Definition: avformat.h:507
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:23
AVStream
Stream structure.
Definition: avformat.h:873
adler32.h
Public header for Adler-32 hash function implementation.
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1384
buf
void * buf
Definition: avisynth_c.h:690
av_strlcatf
size_t av_strlcatf(char *dst, size_t size, const char *fmt,...)
Definition: avstring.c:101
snprintf
#define snprintf
Definition: snprintf.h:34
avformat.h
Main libavformat public API header.
AVPacket::side_data
AVPacketSideData * side_data
Additional packet data that can be provided by the container.
Definition: avcodec.h:1441
ff_framecrc_muxer
AVOutputFormat ff_framecrc_muxer
Definition: framecrcenc.c:79
AV_CODEC_ID_PCM_S16LE
Definition: avcodec.h:452
AVFMT_VARIABLE_FPS
#define AVFMT_VARIABLE_FPS
Format allows variable fps.
Definition: avformat.h:472
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3898
AVPacket::dts
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1429
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1020
AV_CODEC_ID_RAWVIDEO
Definition: avcodec.h:231
AVPacket::stream_index
int stream_index
Definition: avcodec.h:1432
AVFMT_TS_NEGATIVE
#define AVFMT_TS_NEGATIVE
Format allows muxing negative timestamps.
Definition: avformat.h:484
AVPacket
This structure stores compressed data.
Definition: avcodec.h:1407
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1423
avio_printf
int avio_printf(AVIOContext *s, const char *fmt,...) av_printf_format(2
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