snatch/snatch2wav.c

   1 /*
   2  *
   3  *  snatch2wav.c
   4  *
   5  *      Copyright (C) 2001 Monty
   6  *
   7  *  This file is part of snatch2wav, a component of the "MJPEG tools"
   8  *  suite of open source tools for MJPEG and MPEG processing.
   9  *
  10  *  snatch2wav is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2, or (at your option)
  13  *  any later version.
  14  *
  15  *  snatch2wav is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *  GNU General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License
  21  *  along with GNU Make; see the file COPYING.  If not, write to
  22  *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  23  *
  24  *
  25  */
  26
  27 /* Snatch files can consist of multiple depths, rates and channels.
  28    This resamples the given input files to the first rate/number of
  29    channels it sees (or user selected format). */
  30
  31 #include <unistd.h>
  32 #include <stdlib.h>
  33 #include <stdio.h>
  34
  35 extern long       audbuf_rate;
  36 extern int        audbuf_channels;
  37 extern long long  audbuf_samples;
  38
  39 extern long long samplesin;
  40 extern long long samplesout;
  41 extern long long samplesmissing;
  42 extern long long samplesdiscarded;
  43
  44 extern double vidin_fps;
  45 extern double vidout_fps;
  46 extern int video_timeahead;
  47
  48 int snatch_iterator(FILE *in,FILE *out,int process_a,int process_v);
  49
  50 static void usage(FILE *f){
  51   fprintf(f,
  52           "snatch2wav 20011115\n\n"
  53           "USAGE: snatch2wav [options] < infile { > outfile, | nextutil }\n\n"
  54           "OPTIONS:\n"
  55           "  -b <N>    : skip first <N> seconds of input file\n"
  56           "  -c <N>    : convert to <N> output channels\n"
  57           "  -h        : this information to stdout\n"
  58           "  -n <N>    : output only up to the last frame beginning \n"
  59           "              before <N> seconds elapsed from start of file\n"
  60           "              (if preceeding or without -b) or from start of\n"
  61           "              output (following -b)\n"
  62           "  -q        : operate quietly\n"
  63           "  -r <N>    : resample to output rate <N>\n\n");
  64 }
  65
  66 const char *optstring = "b:c:hn:qr:";
  67
  68 extern double begin_time;
  69 extern double end_time;
  70
  71 int main(int argc,char *argv[]){
  72   int done=0;
  73   int noisy =1;
  74   int c;
  75
  76   video_timeahead=2; /* absolute minimum for sync to work */
  77   vidin_fps=30;     /* not critical in audio, but must still be set */
  78   vidout_fps=30;     /* not critical in audio, but must still be set */
  79
  80   while((c=getopt(argc,argv,optstring))!=EOF){
  81     switch(c){
  82     case 'b':
  83       begin_time=atof(optarg);
  84       break;
  85     case 'c':
  86       audbuf_channels=atoi(optarg);
  87       if(audbuf_channels<1)audbuf_channels=1;
  88       if(audbuf_channels>2)audbuf_channels=2;
  89       break;
  90     case 'h':
  91       usage(stdout);
  92       return(0);
  93     case 'n':
  94       end_time=begin_time+atof(optarg);
  95       break;
  96     case 'q':
  97       noisy=0;
  98       break;
  99     case 'r':
 100       audbuf_rate=atol(optarg);
 101       if(audbuf_rate<4000)audbuf_rate=4000;
 102       if(audbuf_rate>48000)audbuf_rate=48000;
 103       break;
 104     default:
 105       usage(stderr);
 106       exit(1);
 107     }
 108   }
 109
 110   while(!done){
 111     done=snatch_iterator(stdin,stdout,1,0);
 112
 113     if(noisy && audbuf_rate){
 114       long seconds=samplesout/audbuf_rate;
 115       long minutes=seconds/60;
 116       long hours;
 117
 118       seconds-=minutes*60;
 119       hours=minutes/60;
 120       minutes-=hours*60;
 121
 122       fprintf(stderr,"\rSamples %ld->%ld dropped:%ld missing:%ld  %ld:%02ld:%02ld",
 123               (long)samplesin,(long)samplesout,(long)samplesdiscarded,(long)samplesmissing,
 124               hours,minutes,seconds);
 125     }
 126   }
 127
 128   if(noisy)fprintf(stderr,"\n");
 129   return(0);
 130 }
 131
 132
 133
 134