67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
#include <stdio.h>
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#include <string.h>
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#define WAV_HEADER_SIZE 64
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#define WAV_FORMAT_FLOAT 0xFFFE
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typedef struct {
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int sampleRate;
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int nChannels;
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long nSamples;
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int aFmt;
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} WavInfo;
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FILE* AuChannelOpen (const char* filename, WavInfo* info)
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{
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unsigned char header[12];
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unsigned char data[WAV_HEADER_SIZE];
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FILE *handle;
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unsigned int chunksize;
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if (!strcmp(filename,"-"))
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handle = stdin;
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else
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handle = fopen(filename, "rb");
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if(!handle) return NULL;
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if(fread(header, 1, 12, handle) != 12) return NULL;
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info->nSamples = (header[4] | (header[5] << 8) | (header[6] << 16) | (header[7] << 24)) + 8;
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while (memcmp(header, "data", 4) != 0){
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if(fread(header, 1, 8, handle) != 8) return NULL;
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chunksize = (header[4] | (header[5] << 8) | (header[6] << 16) | (header[7] << 24));
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//fprintf(stderr, "%c%c%c%c %d", header[0], header[1], header[2], header[3], chunksize);
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if(!memcmp(header, "fmt ", 4)) {
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if(chunksize > WAV_HEADER_SIZE) return NULL;
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if(fread(data, 1, chunksize, handle) != chunksize) return NULL;
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info->aFmt = data[0] | data[1] << 8;
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info->nChannels = data[2] | data[3] << 8;
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info->sampleRate = data[4] | data[5] << 8 | data[6] << 12 | data[7] << 16;
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} else if(memcmp(header, "data", 4) != 0) {
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if(fseek(handle, chunksize, SEEK_CUR) != 0) return NULL;
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}
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}
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return handle;
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}
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void AuChannelClose (FILE *audioChannel)
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{
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fclose(audioChannel);
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}
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size_t AuChannelReadShort(FILE *audioChannel, short *samples, int nSamples, int *readed)
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{
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*readed = fread(samples, 2, nSamples, audioChannel);
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return *readed <= 0;
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}
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size_t AuChannelReadFloat(FILE *audioChannel, float *samples, int nSamples, int *readed)
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{
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*readed = fread(samples, 4, nSamples, audioChannel);
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return *readed <= 0;
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}
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