143 lines
3.6 KiB
C++
143 lines
3.6 KiB
C++
#include "wav.h"
|
|
|
|
#include <sstream>
|
|
#include <string>
|
|
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
typedef struct {
|
|
FILE* fd;
|
|
WavChunkHeader currChunk;
|
|
long currChunkDataPos;
|
|
} WavContext;
|
|
|
|
static bool wav_next_chunk(WavContext* context) {
|
|
if(fseek(context->fd, context->currChunkDataPos + (memcmp(context->currChunk.chunkId, "RIFF", 4) == 0 ? 4 : context->currChunk.chunkSize), SEEK_SET) != 0) {
|
|
return false;
|
|
}
|
|
|
|
if(fread(&context->currChunk, 1, sizeof(WavChunkHeader), context->fd) != sizeof(WavChunkHeader)) {
|
|
return false;
|
|
}
|
|
|
|
context->currChunkDataPos = ftell(context->fd);
|
|
return true;
|
|
}
|
|
|
|
static bool wav_read_chunk_data(WavContext* context, void* data, size_t maxSize) {
|
|
if(fseek(context->fd, context->currChunkDataPos, SEEK_SET) != 0) {
|
|
return false;
|
|
}
|
|
|
|
size_t size = context->currChunk.chunkSize < maxSize ? context->currChunk.chunkSize : maxSize;
|
|
if(fread(data, 1, size, context->fd) != size) {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
WAV* wav_read(FILE* fd) {
|
|
WAV* wav = (WAV*) calloc(1, sizeof(WAV));
|
|
if(wav == NULL) {
|
|
printf("ERROR: Could not allocate memory for WAV data.\n");
|
|
return NULL;
|
|
}
|
|
|
|
std::string error = "";
|
|
bool riff = false;
|
|
bool fmt = false;
|
|
bool data = false;
|
|
|
|
WavContext context;
|
|
memset(&context, 0, sizeof(context));
|
|
context.fd = fd;
|
|
|
|
while(error.empty() && (!riff || !fmt || !data) && wav_next_chunk(&context)) {
|
|
if(memcmp(context.currChunk.chunkId, "RIFF", 4) == 0) {
|
|
riff = true;
|
|
|
|
char format[4];
|
|
if(wav_read_chunk_data(&context, format, sizeof(format))) {
|
|
if(memcmp(format, "WAVE", sizeof(format)) != 0) {
|
|
error = "ERROR: RIFF file is not of WAVE format";
|
|
}
|
|
} else {
|
|
error = "ERROR: Failed to read RIFF chunk data";
|
|
}
|
|
} else if(memcmp(context.currChunk.chunkId, "fmt ", 4) == 0) {
|
|
fmt = true;
|
|
|
|
if(!wav_read_chunk_data(&context, &wav->format, sizeof(WavFormatChunk))) {
|
|
error = "ERROR: Failed to read fmt chunk data";
|
|
}
|
|
} else if(memcmp(context.currChunk.chunkId, "data", 4) == 0) {
|
|
data = true;
|
|
|
|
wav->data.size = context.currChunk.chunkSize;
|
|
wav->data.data = (u8*) malloc(wav->data.size);
|
|
if(wav->data.data != NULL) {
|
|
if(!wav_read_chunk_data(&context, wav->data.data, wav->data.size)) {
|
|
error = "ERROR: Failed to read data chunk data";
|
|
}
|
|
} else {
|
|
error = "ERROR: Could not allocate memory for WAV samples";
|
|
}
|
|
}
|
|
}
|
|
|
|
if(error.empty() && (!riff || !fmt || !data)) {
|
|
std::stringstream stream;
|
|
stream << "ERROR: Missing one or more WAV chunks: ";
|
|
|
|
if(!riff) {
|
|
stream << "RIFF";
|
|
}
|
|
|
|
if(!fmt) {
|
|
if(!riff) {
|
|
stream << ", ";
|
|
}
|
|
|
|
stream << "fmt";
|
|
}
|
|
|
|
if(!data) {
|
|
if(!riff || !fmt) {
|
|
stream << ", ";
|
|
}
|
|
|
|
stream << "data";
|
|
}
|
|
|
|
error = stream.str();
|
|
}
|
|
|
|
if(!error.empty()) {
|
|
wav_free(wav);
|
|
|
|
if(errno != 0) {
|
|
perror(error.c_str());
|
|
} else {
|
|
printf("%s.\n", error.c_str());
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
return wav;
|
|
}
|
|
|
|
void wav_free(WAV* wav) {
|
|
if(wav != NULL) {
|
|
if(wav->data.data != NULL) {
|
|
free(wav->data.data);
|
|
wav->data.data = NULL;
|
|
}
|
|
|
|
free(wav);
|
|
}
|
|
}
|