59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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struct wavfile
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{
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char id[4]; // should always contain "RIFF"
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int totallength; // total file length minus 8
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char wavefmt[8]; // should be "WAVEfmt "
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int format; // 16 for PCM format
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short pcm; // 1 for PCM format
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short channels; // channels
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int frequency; // sampling frequency
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int bytes_per_second;
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short bytes_by_capture;
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short bits_per_sample;
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char data[4]; // should always contain "data"
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int bytes_in_data;
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};
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int main(int argc, char *argv[]) {
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char *filename=argv[1];
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FILE *wav = fopen(filename,"rb");
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struct wavfile header;
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if ( wav == NULL ) {
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fprintf(stderr,"Can't open input file %s", filename);
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exit(1);
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}
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// read header
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if ( fread(&header,sizeof(header),1,wav) < 1 )
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{
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fprintf(stderr,"Can't read file header\n");
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exit(1);
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}
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if ( header.id[0] != 'R'
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|| header.id[1] != 'I'
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|| header.id[2] != 'F'
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|| header.id[3] != 'F' ) {
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fprintf(stderr,"ERROR: Not wav format\n");
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exit(1);
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}
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fprintf(stderr,"wav format\n");
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// read data
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long sum=0;
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short value=0;
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while( fread(&value,sizeof(value),1,wav) ) {
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// fprintf(stderr,"%d\n", value);
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if (value<0) { value=-value; }
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sum += value;
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}
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printf("%ld\n",sum);
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exit(0);
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}
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