FFmpeg
pktdumper.c
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1 /*
2  * Copyright (c) 2005 Francois Revol
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "config.h"
22 #include <limits.h>
23 #include <fcntl.h>
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #if HAVE_UNISTD_H
28 #include <unistd.h>
29 #endif
30 #if HAVE_IO_H
31 #include <io.h>
32 #endif
33 
34 #include "libavutil/avstring.h"
35 #include "libavutil/time.h"
36 #include "libavformat/avformat.h"
37 
38 #define FILENAME_BUF_SIZE 4096
39 #define PKTFILESUFF "_%08" PRId64 "_%02d_%010" PRId64 "_%06d_%c.bin"
40 
41 static int usage(int ret)
42 {
43  fprintf(stderr, "Dump (up to maxpkts) AVPackets as they are demuxed by libavformat.\n");
44  fprintf(stderr, "Each packet is dumped in its own file named like\n");
45  fprintf(stderr, "$(basename file.ext)_$PKTNUM_$STREAMINDEX_$STAMP_$SIZE_$FLAGS.bin\n");
46  fprintf(stderr, "pktdumper [-nw] file [maxpkts]\n");
47  fprintf(stderr, "-n\twrite No file at all, only demux.\n");
48  fprintf(stderr, "-w\tWait at end of processing instead of quitting.\n");
49  return ret;
50 }
51 
52 int main(int argc, char **argv)
53 {
54  char fntemplate[FILENAME_BUF_SIZE];
55  char pktfilename[FILENAME_BUF_SIZE];
56  AVFormatContext *fctx = NULL;
57  AVPacket pkt;
58  int64_t pktnum = 0;
59  int64_t maxpkts = 0;
60  int donotquit = 0;
61  int nowrite = 0;
62  int err;
63 
64  if ((argc > 1) && !strncmp(argv[1], "-", 1)) {
65  if (strchr(argv[1], 'w'))
66  donotquit = 1;
67  if (strchr(argv[1], 'n'))
68  nowrite = 1;
69  argv++;
70  argc--;
71  }
72  if (argc < 2)
73  return usage(1);
74  if (argc > 2)
75  maxpkts = atoi(argv[2]);
76  av_strlcpy(fntemplate, argv[1], sizeof(fntemplate));
77  if (strrchr(argv[1], '/'))
78  av_strlcpy(fntemplate, strrchr(argv[1], '/') + 1, sizeof(fntemplate));
79  if (strrchr(fntemplate, '.'))
80  *strrchr(fntemplate, '.') = '\0';
81  if (strchr(fntemplate, '%')) {
82  fprintf(stderr, "cannot use filenames containing '%%'\n");
83  return usage(1);
84  }
85  if (strlen(fntemplate) + sizeof(PKTFILESUFF) >= sizeof(fntemplate) - 1) {
86  fprintf(stderr, "filename too long\n");
87  return usage(1);
88  }
89  strcat(fntemplate, PKTFILESUFF);
90  printf("FNTEMPLATE: '%s'\n", fntemplate);
91 
92  err = avformat_open_input(&fctx, argv[1], NULL, NULL);
93  if (err < 0) {
94  fprintf(stderr, "cannot open input: error %d\n", err);
95  return 1;
96  }
97 
98  err = avformat_find_stream_info(fctx, NULL);
99  if (err < 0) {
100  fprintf(stderr, "avformat_find_stream_info: error %d\n", err);
101  return 1;
102  }
103 
104  av_init_packet(&pkt);
105 
106  while ((err = av_read_frame(fctx, &pkt)) >= 0) {
107  int fd;
108  snprintf(pktfilename, sizeof(pktfilename), fntemplate, pktnum,
109  pkt.stream_index, pkt.pts, pkt.size,
110  (pkt.flags & AV_PKT_FLAG_KEY) ? 'K' : '_');
111  printf(PKTFILESUFF "\n", pktnum, pkt.stream_index, pkt.pts, pkt.size,
112  (pkt.flags & AV_PKT_FLAG_KEY) ? 'K' : '_');
113  if (!nowrite) {
114  fd = open(pktfilename, O_WRONLY | O_CREAT, 0644);
115  err = write(fd, pkt.data, pkt.size);
116  if (err < 0) {
117  fprintf(stderr, "write: error %d\n", err);
118  return 1;
119  }
120  close(fd);
121  }
122  av_packet_unref(&pkt);
123  pktnum++;
124  if (maxpkts && (pktnum >= maxpkts))
125  break;
126  }
127 
128  avformat_close_input(&fctx);
129 
130  while (donotquit)
131  av_usleep(60 * 1000000);
132 
133  return 0;
134 }
#define NULL
Definition: coverity.c:32
int size
Definition: avcodec.h:1534
int avformat_open_input(AVFormatContext **ps, const char *url, ff_const59 AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: utils.c:537
int av_usleep(unsigned usec)
Sleep for a period of time.
Definition: time.c:84
static AVPacket pkt
Format I/O context.
Definition: avformat.h:1353
static int usage(int ret)
Definition: pktdumper.c:41
uint8_t * data
Definition: avcodec.h:1533
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1565
size_t av_strlcpy(char *dst, const char *src, size_t size)
Copy the string src to dst, but no more than size - 1 bytes, and null-terminate dst.
Definition: avstring.c:83
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1539
#define FILENAME_BUF_SIZE
Definition: pktdumper.c:38
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:600
int main(int argc, char **argv)
Definition: pktdumper.c:52
#define snprintf
Definition: snprintf.h:34
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
Definition: utils.c:1777
#define PKTFILESUFF
Definition: pktdumper.c:39
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:3617
void av_init_packet(AVPacket *pkt)
Initialize optional fields of a packet with default values.
Definition: avpacket.c:33
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:4496
printf("static const uint8_t my_array[100] = {\n")
int stream_index
Definition: avcodec.h:1535
This structure stores compressed data.
Definition: avcodec.h:1510
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1526