Libav
framecrcenc.c
Go to the documentation of this file.
1 /*
2  * frame CRC encoder (for codec/format testing)
3  * Copyright (c) 2002 Fabrice Bellard
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/adler32.h"
23 #include "avformat.h"
24 #include "internal.h"
25 
26 static int framecrc_write_packet(struct AVFormatContext *s, AVPacket *pkt)
27 {
28  uint32_t crc = av_adler32_update(0, pkt->data, pkt->size);
29  char buf[256];
30 
31  snprintf(buf, sizeof(buf), "%d, %10"PRId64", %10"PRId64", %8d, %8d, 0x%08x\n",
32  pkt->stream_index, pkt->dts, pkt->pts, pkt->duration, pkt->size, crc);
33  avio_write(s->pb, buf, strlen(buf));
34  return 0;
35 }
36 
38  .name = "framecrc",
39  .long_name = NULL_IF_CONFIG_SMALL("framecrc testing"),
40  .extensions = "",
41  .audio_codec = AV_CODEC_ID_PCM_S16LE,
42  .video_codec = AV_CODEC_ID_RAWVIDEO,
43  .write_header = ff_framehash_write_header,
44  .write_packet = framecrc_write_packet,
47 };
int size
Definition: avcodec.h:974
#define AVFMT_TS_NONSTRICT
Format does not require strictly increasing timestamps, but they must still be monotonic.
Definition: avformat.h:417
Format I/O context.
Definition: avformat.h:871
static int framecrc_write_packet(struct AVFormatContext *s, AVPacket *pkt)
Definition: framecrcenc.c:26
uint8_t * data
Definition: avcodec.h:973
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:33
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:165
int duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:995
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:142
const char * name
Definition: avformat.h:437
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
AVIOContext * pb
I/O context.
Definition: avformat.h:913
Main libavformat public API header.
AVOutputFormat ff_framecrc_muxer
Definition: framecrcenc.c:37
#define AVFMT_VARIABLE_FPS
Format allows variable fps.
Definition: avformat.h:410
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:972
int stream_index
Definition: avcodec.h:975
#define AVFMT_TS_NEGATIVE
Format allows muxing negative timestamps.
Definition: avformat.h:422
This structure stores compressed data.
Definition: avcodec.h:950
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:966