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aviocat.c
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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] [-oi <options>] [-oo <options>] input_url output_url\n", argv0);
30  fprintf(stderr, "<options>: AVOptions expressed as key=value, :-separated\n");
31  return ret;
32 }
33 
34 int main(int argc, char **argv)
35 {
36  int bps = 0, duration = 0, ret, i;
37  const char *input_url = NULL, *output_url = NULL;
38  int64_t stream_pos = 0;
39  int64_t start_time;
40  char errbuf[50];
41  AVIOContext *input, *output;
42  AVDictionary *in_opts = NULL;
43  AVDictionary *out_opts = NULL;
44 
47 
48  for (i = 1; i < argc; i++) {
49  if (!strcmp(argv[i], "-b") && i + 1 < argc) {
50  bps = atoi(argv[i + 1]);
51  i++;
52  } else if (!strcmp(argv[i], "-d") && i + 1 < argc) {
53  duration = atoi(argv[i + 1]);
54  i++;
55  } else if (!strcmp(argv[i], "-oi") && i + 1 < argc) {
56  if (av_dict_parse_string(&in_opts, argv[i + 1], "=", ":", 0) < 0) {
57  fprintf(stderr, "Cannot parse option string %s\n",
58  argv[i + 1]);
59  return usage(argv[0], 1);
60  }
61  i++;
62  } else if (!strcmp(argv[i], "-oo") && i + 1 < argc) {
63  if (av_dict_parse_string(&out_opts, argv[i + 1], "=", ":", 0) < 0) {
64  fprintf(stderr, "Cannot parse option string %s\n",
65  argv[i + 1]);
66  return usage(argv[0], 1);
67  }
68  i++;
69  } else if (!input_url) {
70  input_url = argv[i];
71  } else if (!output_url) {
72  output_url = argv[i];
73  } else {
74  return usage(argv[0], 1);
75  }
76  }
77  if (!output_url)
78  return usage(argv[0], 1);
79 
80  ret = avio_open2(&input, input_url, AVIO_FLAG_READ, NULL, &in_opts);
81  if (ret) {
82  av_strerror(ret, errbuf, sizeof(errbuf));
83  fprintf(stderr, "Unable to open %s: %s\n", input_url, errbuf);
84  return 1;
85  }
86  if (duration && !bps) {
87  int64_t size = avio_size(input);
88  if (size < 0) {
89  av_strerror(ret, errbuf, sizeof(errbuf));
90  fprintf(stderr, "Unable to get size of %s: %s\n", input_url, errbuf);
91  goto fail;
92  }
93  bps = size / duration;
94  }
95  ret = avio_open2(&output, output_url, AVIO_FLAG_WRITE, NULL, &out_opts);
96  if (ret) {
97  av_strerror(ret, errbuf, sizeof(errbuf));
98  fprintf(stderr, "Unable to open %s: %s\n", output_url, errbuf);
99  goto fail;
100  }
101 
102  start_time = av_gettime_relative();
103  while (1) {
104  uint8_t buf[1024];
105  int n;
106  n = avio_read(input, buf, sizeof(buf));
107  if (n <= 0)
108  break;
109  avio_write(output, buf, n);
110  stream_pos += n;
111  if (bps) {
112  avio_flush(output);
113  while ((av_gettime_relative() - start_time) * bps / AV_TIME_BASE < stream_pos)
114  av_usleep(50 * 1000);
115  }
116  }
117 
118  avio_flush(output);
119  avio_close(output);
120 
121 fail:
122  av_dict_free(&in_opts);
123  av_dict_free(&out_opts);
124  avio_close(input);
126  return ret ? 1 : 0;
127 }
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:329
#define AVIO_FLAG_READ
read-only
Definition: avio.h:643
#define AVIO_FLAG_WRITE
write-only
Definition: avio.h:644
int av_usleep(unsigned usec)
Sleep for a period of time.
Definition: time.c:84
int main(int argc, char **argv)
Definition: aviocat.c:34
static int64_t start_time
Definition: ffplay.c:327
uint8_t
int64_t duration
Definition: movenc.c:63
int avformat_network_init(void)
Do global initialization of network components.
Definition: utils.c:4850
ptrdiff_t size
Definition: opengl_enc.c:101
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:211
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:632
int avio_close(AVIOContext *s)
Close the resource accessed by the AVIOContext s and free it.
Definition: aviobuf.c:1107
void av_dict_free(AVDictionary **pm)
Free all the memory allocated for an AVDictionary struct and all keys and values. ...
Definition: dict.c:203
#define fail()
Definition: checkasm.h:98
int void avio_flush(AVIOContext *s)
Force flushing of buffered data.
Definition: aviobuf.c:231
#define AV_TIME_BASE
Internal time base represented as integer.
Definition: avutil.h:254
int n
Definition: avisynth_c.h:684
int av_dict_parse_string(AVDictionary **pm, const char *str, const char *key_val_sep, const char *pairs_sep, int flags)
Parse the key/value pairs list and add the parsed entries to a dictionary.
Definition: dict.c:180
int avformat_network_deinit(void)
Undo the initialization done by avformat_network_init.
Definition: utils.c:4863
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:1095
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:1408
void av_register_all(void)
Initialize libavformat and register all the muxers, demuxers and protocols.
Definition: allformats.c:387