pktdumper.c
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1 /*
2  * Copyright (c) 2005 Francois Revol
3  *
4  * This file is part of Libav.
5  *
6  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include <limits.h>
22 #include <fcntl.h>
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <string.h>
26 #include <unistd.h>
27 #include "libavformat/avformat.h"
28 
29 #define PKTFILESUFF "_%08"PRId64"_%02d_%010"PRId64"_%06d_%c.bin"
30 
31 #undef strcat
32 
33 static int usage(int ret)
34 {
35  fprintf(stderr, "dump (up to maxpkts) AVPackets as they are demuxed by libavformat.\n");
36  fprintf(stderr, "each packet is dumped in its own file named like `basename file.ext`_$PKTNUM_$STREAMINDEX_$STAMP_$SIZE_$FLAGS.bin\n");
37  fprintf(stderr, "pktdumper [-nw] file [maxpkts]\n");
38  fprintf(stderr, "-n\twrite No file at all, only demux.\n");
39  fprintf(stderr, "-w\tWait at end of processing instead of quitting.\n");
40  return ret;
41 }
42 
43 int main(int argc, char **argv)
44 {
45  char fntemplate[PATH_MAX];
46  char pktfilename[PATH_MAX];
47  AVFormatContext *fctx = NULL;
48  AVPacket pkt;
49  int64_t pktnum = 0;
50  int64_t maxpkts = 0;
51  int donotquit = 0;
52  int nowrite = 0;
53  int err;
54 
55  if ((argc > 1) && !strncmp(argv[1], "-", 1)) {
56  if (strchr(argv[1], 'w'))
57  donotquit = 1;
58  if (strchr(argv[1], 'n'))
59  nowrite = 1;
60  argv++;
61  argc--;
62  }
63  if (argc < 2)
64  return usage(1);
65  if (argc > 2)
66  maxpkts = atoi(argv[2]);
67  strncpy(fntemplate, argv[1], PATH_MAX-1);
68  if (strrchr(argv[1], '/'))
69  strncpy(fntemplate, strrchr(argv[1], '/')+1, PATH_MAX-1);
70  if (strrchr(fntemplate, '.'))
71  *strrchr(fntemplate, '.') = '\0';
72  if (strchr(fntemplate, '%')) {
73  fprintf(stderr, "can't use filenames containing '%%'\n");
74  return usage(1);
75  }
76  if (strlen(fntemplate) + sizeof(PKTFILESUFF) >= PATH_MAX-1) {
77  fprintf(stderr, "filename too long\n");
78  return usage(1);
79  }
80  strcat(fntemplate, PKTFILESUFF);
81  printf("FNTEMPLATE: '%s'\n", fntemplate);
82 
83  // register all file formats
85 
86  err = avformat_open_input(&fctx, argv[1], NULL, NULL);
87  if (err < 0) {
88  fprintf(stderr, "cannot open input: error %d\n", err);
89  return 1;
90  }
91 
92  err = avformat_find_stream_info(fctx, NULL);
93  if (err < 0) {
94  fprintf(stderr, "avformat_find_stream_info: error %d\n", err);
95  return 1;
96  }
97 
98  av_init_packet(&pkt);
99 
100  while ((err = av_read_frame(fctx, &pkt)) >= 0) {
101  int fd;
102  snprintf(pktfilename, PATH_MAX-1, fntemplate, pktnum, pkt.stream_index, pkt.pts, pkt.size, (pkt.flags & AV_PKT_FLAG_KEY)?'K':'_');
103  printf(PKTFILESUFF"\n", pktnum, pkt.stream_index, pkt.pts, pkt.size, (pkt.flags & AV_PKT_FLAG_KEY)?'K':'_');
104  //printf("open(\"%s\")\n", pktfilename);
105  if (!nowrite) {
106  fd = open(pktfilename, O_WRONLY|O_CREAT, 0644);
107  err = write(fd, pkt.data, pkt.size);
108  if (err < 0) {
109  fprintf(stderr, "write: error %d\n", err);
110  return 1;
111  }
112  close(fd);
113  }
114  av_free_packet(&pkt);
115  pktnum++;
116  if (maxpkts && (pktnum >= maxpkts))
117  break;
118  }
119 
120  avformat_close_input(&fctx);
121 
122  while (donotquit)
123  sleep(60);
124 
125  return 0;
126 }
int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: utils.c:606
int size
Definition: avcodec.h:909
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:954
#define strncpy
Definition: internal.h:147
Format I/O context.
Definition: avformat.h:863
void av_init_packet(AVPacket *pkt)
Initialize optional fields of a packet with default values.
Definition: avpacket.c:46
static int usage(int ret)
Definition: pktdumper.c:33
uint8_t * data
Definition: avcodec.h:908
void av_free_packet(AVPacket *pkt)
Free a packet.
Definition: avpacket.c:151
#define strcat
Definition: internal.h:145
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:914
NULL
Definition: eval.c:50
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:327
int main(int argc, char **argv)
Definition: pktdumper.c:43
#define printf
Definition: internal.h:151
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
Definition: utils.c:1264
#define PKTFILESUFF
Definition: pktdumper.c:29
Main libavformat public API header.
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
Read packets of a media file to get stream information.
Definition: utils.c:2293
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:2752
#define fprintf
Definition: internal.h:153
int stream_index
Definition: avcodec.h:910
void av_register_all(void)
Initialize libavformat and register all the muxers, demuxers and protocols.
Definition: allformats.c:40
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:901