static boolByte _readWaveFileInfo(const char *filename, SampleSourcePcmData extraData)
{
int chunkOffset = 0;
RiffChunk chunk = newRiffChunk();
boolByte dataChunkFound = false;
char format[4];
size_t itemsRead;
unsigned int audioFormat;
unsigned int byteRate;
unsigned int expectedByteRate;
unsigned int blockAlign;
unsigned int expectedBlockAlign;
if (riffChunkReadNext(chunk, extraData->fileHandle, false)) {
if (!riffChunkIsIdEqualTo(chunk, "RIFF")) {
logFileError(filename, "Invalid RIFF chunk descriptor");
freeRiffChunk(chunk);
return false;
}
// The WAVE file format has two sub-chunks, with the size of both calculated in the size field. Before
// either of the subchunks, there are an extra 4 bytes which indicate the format type. We need to read
// that before either of the subchunks can be parsed.
itemsRead = fread(format, sizeof(byte), 4, extraData->fileHandle);
if (itemsRead != 4 || strncmp(format, "WAVE", 4)) {
logFileError(filename, "Invalid format description");
freeRiffChunk(chunk);
return false;
}
} else {
logFileError(filename, "No chunks following descriptor");
freeRiffChunk(chunk);
return false;
}
if (riffChunkReadNext(chunk, extraData->fileHandle, true)) {
if (!riffChunkIsIdEqualTo(chunk, "fmt ")) {
logError(filename, "Invalid format chunk header");
freeRiffChunk(chunk);
return false;
}
audioFormat = convertByteArrayToUnsignedShort(chunk->data + chunkOffset);
chunkOffset += 2;
if (audioFormat != 1) {
logError("WAVE file with audio format %d is not supported", audioFormat);
freeRiffChunk(chunk);
return false;
}
extraData->numChannels = convertByteArrayToUnsignedShort(chunk->data + chunkOffset);
chunkOffset += 2;
setNumChannels(extraData->numChannels);
extraData->sampleRate = convertByteArrayToUnsignedInt(chunk->data + chunkOffset);
chunkOffset += 4;
setSampleRate(extraData->sampleRate);
byteRate = convertByteArrayToUnsignedInt(chunk->data + chunkOffset);
chunkOffset += 4;
blockAlign = convertByteArrayToUnsignedShort(chunk->data + chunkOffset);
chunkOffset += 2;
extraData->bitDepth = (BitDepth) convertByteArrayToUnsignedShort(chunk->data + chunkOffset);
if (extraData->bitDepth != kBitDepth16Bit) {
logUnsupportedFeature("Non-16-bit files with internal WAVE file support (build with audiofile instead!)");
freeRiffChunk(chunk);
return false;
}
expectedByteRate = (unsigned int)(extraData->sampleRate) *
extraData->numChannels * extraData->bitDepth / 8;
if (expectedByteRate != byteRate) {
logWarn("Possibly invalid bitrate %d, expected %d", byteRate, expectedByteRate);
}
expectedBlockAlign = (unsigned int)(extraData->numChannels * extraData->bitDepth / 8);
if (expectedBlockAlign != blockAlign) {
logWarn("Possibly invalid block align %d, expected %d", blockAlign, expectedBlockAlign);
}
} else {
logFileError(filename, "WAVE file has no chunks following format");
freeRiffChunk(chunk);
return false;
}
// We don't need the format data anymore, so free and re-alloc the chunk to avoid a small memory leak
freeRiffChunk(chunk);
chunk = newRiffChunk();
// FFMpeg (and possibly other programs) have extra sections between the fmt and data chunks. They
// can be safely ignored. We just need to find the data chunk. See also:
// http://forum.videohelp.com/threads/359689-ffmpeg-Override-Set-ISFT-Metadata
while (!dataChunkFound) {
if (riffChunkReadNext(chunk, extraData->fileHandle, false)) {
if (riffChunkIsIdEqualTo(chunk, "data")) {
logDebug("WAVE file has %d bytes", chunk->size);
dataChunkFound = true;
} else {
fseek(extraData->fileHandle, (long) chunk->size, SEEK_CUR);
}
} else {
break;
}
}
if (!dataChunkFound) {
logFileError(filename, "Could not find a data chunk. Possibly malformed WAVE file.");
freeRiffChunk(chunk);
return false;
}
freeRiffChunk(chunk);
return true;
}
static boolByte _readWaveFileInfo(const char* filename, SampleSourcePcmData extraData) {
int chunkOffset = 0;
RiffChunk chunk = newRiffChunk();
char format[4];
size_t itemsRead;
unsigned int audioFormat;
unsigned int byteRate;
unsigned int expectedByteRate;
unsigned int blockAlign;
unsigned int expectedBlockAlign;
if(riffChunkReadNext(chunk, extraData->fileHandle, false)) {
if(!riffChunkIsIdEqualTo(chunk, "RIFF")) {
logFileError(filename, "Invalid RIFF chunk descriptor");
freeRiffChunk(chunk);
return false;
}
// The WAVE file format has two sub-chunks, with the size of both calculated in the size field. Before
// either of the subchunks, there are an extra 4 bytes which indicate the format type. We need to read
// that before either of the subchunks can be parsed.
itemsRead = fread(format, sizeof(byte), 4, extraData->fileHandle);
if(itemsRead != 4 || strncmp(format, "WAVE", 4)) {
logFileError(filename, "Invalid format description");
freeRiffChunk(chunk);
return false;
}
}
else {
logFileError(filename, "No chunks following descriptor");
freeRiffChunk(chunk);
return false;
}
if(riffChunkReadNext(chunk, extraData->fileHandle, true)) {
if(!riffChunkIsIdEqualTo(chunk, "fmt ")) {
logError(filename, "Invalid format chunk header");
freeRiffChunk(chunk);
return false;
}
audioFormat = convertByteArrayToUnsignedShort(chunk->data + chunkOffset);
chunkOffset += 2;
if(audioFormat != 1) {
logUnsupportedFeature("Compressed WAVE files");
freeRiffChunk(chunk);
return false;
}
extraData->numChannels = convertByteArrayToUnsignedShort(chunk->data + chunkOffset);
chunkOffset += 2;
setNumChannels(extraData->numChannels);
extraData->sampleRate = convertByteArrayToUnsignedInt(chunk->data + chunkOffset);
chunkOffset += 4;
setSampleRate(extraData->sampleRate);
byteRate = convertByteArrayToUnsignedInt(chunk->data + chunkOffset);
chunkOffset += 4;
blockAlign = convertByteArrayToUnsignedShort(chunk->data + chunkOffset);
chunkOffset += 2;
extraData->bitsPerSample = convertByteArrayToUnsignedShort(chunk->data + chunkOffset);
if(extraData->bitsPerSample > 16) {
logUnsupportedFeature("Bitrates greater than 16");
freeRiffChunk(chunk);
return false;
}
else if(extraData->bitsPerSample < 16) {
logUnsupportedFeature("Bitrates lower than 16");
freeRiffChunk(chunk);
return false;
}
expectedByteRate = extraData->sampleRate * extraData->numChannels * extraData->bitsPerSample / 8;
if(expectedByteRate != byteRate) {
logWarn("Possibly invalid bitrate %d, expected %d", byteRate, expectedByteRate);
}
expectedBlockAlign = extraData->numChannels * extraData->bitsPerSample / 8;
if(expectedBlockAlign != blockAlign) {
logWarn("Possibly invalid block align %d, expected %d", blockAlign, expectedBlockAlign);
}
}
else {
logFileError(filename, "WAVE file has no chunks following format");
freeRiffChunk(chunk);
return false;
}
// We don't need the format data anymore, so free and re-alloc the chunk to avoid a small memory leak
freeRiffChunk(chunk);
chunk = newRiffChunk();
if(riffChunkReadNext(chunk, extraData->fileHandle, false)) {
if(!riffChunkIsIdEqualTo(chunk, "data")) {
logFileError(filename, "WAVE file has invalid data chunk header");
freeRiffChunk(chunk);
return false;
}
logDebug("WAVE file has %d bytes", chunk->size);
}
freeRiffChunk(chunk);
return true;
}