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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] input_url output_url\n", argv0);
  30.     return ret;
  31. }
  32.  
  33. int main(int argc, char **argv)
  34. {
  35.     int bps = 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.  
  42.     av_register_all();
  43.     avformat_network_init();
  44.  
  45.     for (i = 1; i < argc; i++) {
  46.         if (!strcmp(argv[i], "-b")) {
  47.             bps = atoi(argv[i + 1]);
  48.             i++;
  49.         } else if (!input_url) {
  50.             input_url = argv[i];
  51.         } else if (!output_url) {
  52.             output_url = argv[i];
  53.         } else {
  54.             return usage(argv[0], 1);
  55.         }
  56.     }
  57.     if (!output_url)
  58.         return usage(argv[0], 1);
  59.  
  60.     ret = avio_open2(&input, input_url, AVIO_FLAG_READ, NULL, NULL);
  61.     if (ret) {
  62.         av_strerror(ret, errbuf, sizeof(errbuf));
  63.         fprintf(stderr, "Unable to open %s: %s\n", input_url, errbuf);
  64.         return 1;
  65.     }
  66.     ret = avio_open2(&output, output_url, AVIO_FLAG_WRITE, NULL, NULL);
  67.     if (ret) {
  68.         av_strerror(ret, errbuf, sizeof(errbuf));
  69.         fprintf(stderr, "Unable to open %s: %s\n", output_url, errbuf);
  70.         goto fail;
  71.     }
  72.  
  73.     start_time = av_gettime();
  74.     while (1) {
  75.         uint8_t buf[1024];
  76.         int n;
  77.         n = avio_read(input, buf, sizeof(buf));
  78.         if (n <= 0)
  79.             break;
  80.         avio_write(output, buf, n);
  81.         stream_pos += n;
  82.         if (bps) {
  83.             avio_flush(output);
  84.             while ((av_gettime() - start_time) * bps / AV_TIME_BASE < stream_pos)
  85.                 av_usleep(50 * 1000);
  86.         }
  87.     }
  88.  
  89.     avio_flush(output);
  90.     avio_close(output);
  91.  
  92. fail:
  93.     avio_close(input);
  94.     avformat_network_deinit();
  95.     return ret ? 1 : 0;
  96. }
  97.