raw.cpp

Enc 压 缩 wav文件为 A16格式的 文件

// $Revision: 1.1.1.1 $

#include "wavestream.h"
#include "raw.h"

uint flength(FILE *stream);

int  craw::start_read()
{
   info->length = ::flength(info->pf)/2;
   info->ch     = 1;
   info->fs     = 8000;
   info->bits   = 16;
   info->offset = 0x8000;     // offset
   info->read_write = 0; // read
   info->types  = 1;     // LSB first

   return 0; // normal return
}

int  craw::start_write(uint format)
{
    return 0;
}

void craw::end_read()
{
}

void craw::end_write()
{
}

#ifdef _TEST_

#ifdef _OSTREAM_

void help()
{
  printf(" useage %wav [options] \n");
  printf(" options:\n");
  printf(" -o filename : assign output file \n");
  printf(" -f fs       : assign sample frequency\n");
  printf(" -b bits     : assign bits per sample (8/16)\n");
  printf(" -s          : stereo mode\n");
  printf(" -h          : show this message\n");
  exit(0);
}

int main(int argc,char **argv)
{
   int 		fs,ch,bits;
   char 	*fname;
   int		sample;

   argc--;
   argv++;

   fs = 8000; ch = 1; bits = 16;
   fname = "out.wav";

   while (argc > 0) {
        if( argv[0][0] == '-' ) {
            switch(argv[0][1]) {
            case 'f' : fs = atoi(argv[1]);
 		       argc--; argv++;
                       break;
            case 's' : ch = 2;
                       break;
            case 'm' : ch = 1;
                       break;
            case 'b' : bits = atoi(argv[1]);
                       bits = (bits>8) ? 16 : 8;
		       argc--; argv++;
                       break;
            case 'o' : fname = argv[1];
		       argc--; argv++;
		       break;
            case 'h' : help();

            default  :
		       printf("unkown opiton %s !\n",argv[0]);
                       help();
            }
        }
        argc--;
        argv++;
   }
   
   wavestream os(fname,fs);

   os.setChannels(ch);
   os.setBitsPerSample(bits);

   os.start_write(RIFF);

   while(scanf("%d",&sample) != EOF) {
     os.write((void*)&sample,1);
   };

   os.end_write();

   return 0;
}
#else

int main(int argc,char **argv)
{
   short sample;
   if(argc<2) return 0;

   wavestream is(argv[1]);
   is.start_read();
   
   while(is.read(&sample,1)){
     printf("%d\n",sample);
   }
}

#endif

#endif