FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
aviocat.c
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2012 Martin Storsjo
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 <stdio.h>
22 #include <stdlib.h>
23 
24 #include "libavutil/time.h"
25 #include "libavformat/avformat.h"
26 
27 static int usage(const char *argv0, int ret)
28 {
29  fprintf(stderr, "%s [-b bytespersec] [-d duration] input_url output_url\n", argv0);
30  return ret;
31 }
32 
33 int main(int argc, char **argv)
34 {
35  int bps = 0, duration = 0, ret, i;
36  const char *input_url = NULL, *output_url = NULL;
37  int64_t stream_pos = 0;
38  int64_t start_time;
39  char errbuf[50];
40  AVIOContext *input, *output;
41 
44 
45  for (i = 1; i < argc; i++) {
46  if (!strcmp(argv[i], "-b") && i + 1 < argc) {
47  bps = atoi(argv[i + 1]);
48  i++;
49  } else if (!strcmp(argv[i], "-d") && i + 1 < argc) {
50  duration = atoi(argv[i + 1]);
51  i++;
52  } else if (!input_url) {
53  input_url = argv[i];
54  } else if (!output_url) {
55  output_url = argv[i];
56  } else {
57  return usage(argv[0], 1);
58  }
59  }
60  if (!output_url)
61  return usage(argv[0], 1);
62 
63  ret = avio_open2(&input, input_url, AVIO_FLAG_READ, NULL, NULL);
64  if (ret) {
65  av_strerror(ret, errbuf, sizeof(errbuf));
66  fprintf(stderr, "Unable to open %s: %s\n", input_url, errbuf);
67  return 1;
68  }
69  if (duration && !bps) {
70  int64_t size = avio_size(input);
71  if (size < 0) {
72  av_strerror(ret, errbuf, sizeof(errbuf));
73  fprintf(stderr, "Unable to get size of %s: %s\n", input_url, errbuf);
74  goto fail;
75  }
76  bps = size / duration;
77  }
78  ret = avio_open2(&output, output_url, AVIO_FLAG_WRITE, NULL, NULL);
79  if (ret) {
80  av_strerror(ret, errbuf, sizeof(errbuf));
81  fprintf(stderr, "Unable to open %s: %s\n", output_url, errbuf);
82  goto fail;
83  }
84 
85  start_time = av_gettime_relative();
86  while (1) {
87  uint8_t buf[1024];
88  int n;
89  n = avio_read(input, buf, sizeof(buf));
90  if (n <= 0)
91  break;
92  avio_write(output, buf, n);
93  stream_pos += n;
94  if (bps) {
95  avio_flush(output);
96  while ((av_gettime_relative() - start_time) * bps / AV_TIME_BASE < stream_pos)
97  av_usleep(50 * 1000);
98  }
99  }
100 
101  avio_flush(output);
102  avio_close(output);
103 
104 fail:
105  avio_close(input);
107  return ret ? 1 : 0;
108 }
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:147
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:309
#define AVIO_FLAG_READ
read-only
Definition: avio.h:606
#define AVIO_FLAG_WRITE
write-only
Definition: avio.h:607
int av_usleep(unsigned usec)
Sleep for a period of time.
Definition: time.c:76
int main(int argc, char **argv)
Definition: aviocat.c:33
static int64_t start_time
Definition: ffplay.c:329
uint8_t
int64_t duration
Definition: movenc.c:63
int avformat_network_init(void)
Do global initialization of network components.
Definition: utils.c:4660
ptrdiff_t size
Definition: opengl_enc.c:101
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:204
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:604
int avio_close(AVIOContext *s)
Close the resource accessed by the AVIOContext s and free it.
Definition: aviobuf.c:1069
#define fail()
Definition: checkasm.h:82
int void avio_flush(AVIOContext *s)
Force flushing of buffered data.
Definition: aviobuf.c:224
#define AV_TIME_BASE
Internal time base represented as integer.
Definition: avutil.h:248
int n
Definition: avisynth_c.h:684
int avformat_network_deinit(void)
Undo the initialization done by avformat_network_init.
Definition: utils.c:4673
void * buf
Definition: avisynth_c.h:690
int avio_open2(AVIOContext **s, const char *url, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options)
Create and initialize a AVIOContext for accessing the resource indicated by url.
Definition: aviobuf.c:1057
static int usage(const char *argv0, int ret)
Definition: aviocat.c:27
int64_t av_gettime_relative(void)
Get the current time in microseconds since some unspecified starting point.
Definition: time.c:56
int av_strerror(int errnum, char *errbuf, size_t errbuf_size)
Put a description of the AVERROR code errnum in errbuf.
Definition: error.c:105
Main libavformat public API header.
unsigned bps
Definition: movenc.c:1383
void av_register_all(void)
Initialize libavformat and register all the muxers, demuxers and protocols.
Definition: allformats.c:44