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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 
46 
47  for (i = 1; i < argc; i++) {
48  if (!strcmp(argv[i], "-b") && i + 1 < argc) {
49  bps = atoi(argv[i + 1]);
50  i++;
51  } else if (!strcmp(argv[i], "-d") && i + 1 < argc) {
52  duration = atoi(argv[i + 1]);
53  i++;
54  } else if (!strcmp(argv[i], "-oi") && i + 1 < argc) {
55  if (av_dict_parse_string(&in_opts, argv[i + 1], "=", ":", 0) < 0) {
56  fprintf(stderr, "Cannot parse option string %s\n",
57  argv[i + 1]);
58  return usage(argv[0], 1);
59  }
60  i++;
61  } else if (!strcmp(argv[i], "-oo") && i + 1 < argc) {
62  if (av_dict_parse_string(&out_opts, argv[i + 1], "=", ":", 0) < 0) {
63  fprintf(stderr, "Cannot parse option string %s\n",
64  argv[i + 1]);
65  return usage(argv[0], 1);
66  }
67  i++;
68  } else if (!input_url) {
69  input_url = argv[i];
70  } else if (!output_url) {
71  output_url = argv[i];
72  } else {
73  return usage(argv[0], 1);
74  }
75  }
76  if (!output_url)
77  return usage(argv[0], 1);
78 
79  ret = avio_open2(&input, input_url, AVIO_FLAG_READ, NULL, &in_opts);
80  if (ret) {
81  av_strerror(ret, errbuf, sizeof(errbuf));
82  fprintf(stderr, "Unable to open %s: %s\n", input_url, errbuf);
83  return 1;
84  }
85  if (duration && !bps) {
86  int64_t size = avio_size(input);
87  if (size < 0) {
88  av_strerror(ret, errbuf, sizeof(errbuf));
89  fprintf(stderr, "Unable to get size of %s: %s\n", input_url, errbuf);
90  goto fail;
91  }
92  bps = size / duration;
93  }
94  ret = avio_open2(&output, output_url, AVIO_FLAG_WRITE, NULL, &out_opts);
95  if (ret) {
96  av_strerror(ret, errbuf, sizeof(errbuf));
97  fprintf(stderr, "Unable to open %s: %s\n", output_url, errbuf);
98  goto fail;
99  }
100 
101  start_time = av_gettime_relative();
102  while (1) {
103  uint8_t buf[1024];
104  int n;
105  n = avio_read(input, buf, sizeof(buf));
106  if (n <= 0)
107  break;
108  avio_write(output, buf, n);
109  if (output->error) {
110  av_strerror(output->error, errbuf, sizeof(errbuf));
111  fprintf(stderr, "Unable to write %s: %s\n", output_url, errbuf);
112  break;
113  }
114  stream_pos += n;
115  if (bps) {
116  avio_flush(output);
117  while ((av_gettime_relative() - start_time) * bps / AV_TIME_BASE < stream_pos)
118  av_usleep(50 * 1000);
119  }
120  }
121 
122  avio_flush(output);
123  avio_close(output);
124 
125 fail:
126  av_dict_free(&in_opts);
127  av_dict_free(&out_opts);
128  avio_close(input);
130  return ret ? 1 : 0;
131 }
#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:336
#define AVIO_FLAG_READ
read-only
Definition: avio.h:654
#define AVIO_FLAG_WRITE
write-only
Definition: avio.h:655
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 libraries.
Definition: utils.c:4938
ptrdiff_t size
Definition: opengl_enc.c:101
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:218
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:648
int avio_close(AVIOContext *s)
Close the resource accessed by the AVIOContext s and free it.
Definition: aviobuf.c:1190
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:117
int void avio_flush(AVIOContext *s)
Force flushing of buffered data.
Definition: aviobuf.c:238
#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:4950
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:1178
static int usage(const char *argv0, int ret)
Definition: aviocat.c:27
int error
contains the error code or 0 if no error happened
Definition: avio.h:245
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:1456