107 lines
3 KiB
C
107 lines
3 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h> // for memcmp
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#include <stdint.h> // for int16_t and int32_t
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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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int32_t totallength; // total file length minus 8
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char wavefmt[8]; // should be "WAVEfmt "
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int32_t format; // 16 for PCM format
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int16_t pcm; // 1 for PCM format
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int16_t channels; // channels
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int32_t frequency; // sampling frequency
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int32_t bytes_per_second;
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int16_t bytes_by_capture;
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int16_t bits_per_sample;
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char data[4]; // should always contain "data"
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int32_t bytes_in_data;
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} __attribute__((__packed__));
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int is_big_endian(void) {
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union {
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uint32_t i;
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char c[4];
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} bint = {0x01000000};
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return bint.c[0]==1;
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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\n", 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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fprintf(stderr,"Can't read input file header %s\n", filename);
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exit(1);
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}
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// if wav file isn't the same endianness than the current environment
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// we quit
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if ( is_big_endian() ) {
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if ( memcmp( header.id,"RIFX", 4) != 0 ) {
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fprintf(stderr,"ERROR: %s is not a big endian wav file\n", filename);
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exit(1);
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}
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} else {
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if ( memcmp( header.id,"RIFF", 4) != 0 ) {
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fprintf(stderr,"ERROR: %s is not a little endian wav file\n", filename);
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exit(1);
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}
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}
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if ( memcmp( header.wavefmt, "WAVEfmt ", 8) != 0
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|| memcmp( header.data, "data", 4) != 0
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) {
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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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if (header.format != 16) {
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fprintf(stderr,"\nERROR: not 16 bit wav format.");
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exit(1);
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}
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fprintf(stderr,"format: %d bits", header.format);
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if (header.format == 16) {
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fprintf(stderr,", PCM");
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} else {
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fprintf(stderr,", not PCM (%d)", header.format);
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}
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if (header.pcm == 1) {
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fprintf(stderr, " uncompressed" );
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} else {
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fprintf(stderr, " compressed" );
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}
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fprintf(stderr,", channel %d", header.pcm);
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fprintf(stderr,", freq %d", header.frequency );
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fprintf(stderr,", %d bytes per sec", header.bytes_per_second );
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fprintf(stderr,", %d bytes by capture", header.bytes_by_capture );
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fprintf(stderr,", %d bits per sample", header.bytes_by_capture );
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fprintf(stderr,"\n" );
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if ( memcmp( header.data, "data", 4) != 0 ) {
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fprintf(stderr,"ERROR: Prrroblem?\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 long sum=0;
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int16_t value;
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int i=0;
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fprintf(stderr,"---\n", value);
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while( fread(&value,sizeof(value),1,wav) ) {
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if (value<0) { value=-value; }
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sum += value;
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}
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printf("%lld\n",sum);
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exit(0);
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}
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