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 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 
25 static int framecrc_write_packet(struct AVFormatContext *s, AVPacket *pkt)
26 {
27  uint32_t crc = av_adler32_update(0, pkt->data, pkt->size);
28  char buf[256];
29 
30  snprintf(buf, sizeof(buf), "%d, %"PRId64", %d, 0x%08x\n", pkt->stream_index, pkt->dts, pkt->size, crc);
31  avio_write(s->pb, buf, strlen(buf));
32  avio_flush(s->pb);
33  return 0;
34 }
35 
37  .name = "framecrc",
38  .long_name = NULL_IF_CONFIG_SMALL("framecrc testing format"),
39  .extensions = "",
40  .audio_codec = CODEC_ID_PCM_S16LE,
41  .video_codec = CODEC_ID_RAWVIDEO,
42  .write_packet = framecrc_write_packet,
43  .flags = AVFMT_VARIABLE_FPS,
44 };
int size
Definition: avcodec.h:909
Format I/O context.
Definition: avformat.h:863
static int framecrc_write_packet(struct AVFormatContext *s, AVPacket *pkt)
Definition: framecrcenc.c:25
uint8_t * data
Definition: avcodec.h:908
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:190
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:191
int void avio_flush(AVIOContext *s)
Definition: aviobuf.c:205
const char * name
Definition: avformat.h:390
AVIOContext * pb
Definition: avformat.h:896
Main libavformat public API header.
AVOutputFormat ff_framecrc_muxer
Definition: framecrcenc.c:36
#define AVFMT_VARIABLE_FPS
Format allows variable fps.
Definition: avformat.h:378
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:907
int stream_index
Definition: avcodec.h:910