Function LoadSample

TombEngine/Sound/sound.cpp:86–165

}

bool LoadSample(char* pointer, int compSize, int uncompSize, int index)
{
	if (index >= SOUND_MAX_SAMPLES)
	{
		TENLog("Sample index " + std::to_string(index) + " is larger than max. amount of samples", LogLevel::Warning);
		return 0;
	}

	if (pointer == nullptr || compSize <= 0)
	{
		TENLog("Sample size or memory address is incorrect for index " + std::to_string(index), LogLevel::Warning);
		return 0;
	}

	// Load and uncompress sample to 32-bit float format.
	HSAMPLE sample = BASS_SampleLoad(true, pointer, 0, compSize, 1, SOUND_SAMPLE_FLAGS);

	if (!sample)
	{
		TENLog("Error loading sample " + std::to_string(index), LogLevel::Error);
		return false;
	}

	// Paranoid (c) TeslaRus
	// Try to free sample before allocating new one.
	Sound_FreeSample(index);

	BASS_SAMPLE info;
	BASS_SampleGetInfo(sample, &info);
	int finalLength = info.length + 44;	// uncompSize is invalid after 16->32 bit conversion

	if (info.freq != 22050 || info.chans != 1)
	{
		TENLog("Wrong sample parameters, must be 22050 Hz Mono", LogLevel::Error);
		return false;
	}

	// Generate RIFF/WAV header to simplify loading sample data to stream. In case if RIFF/WAV header
	// exists, stream could be completely created just by calling BASS_StreamCreateFile().
	char* uncompBuffer = new char[finalLength];
	ZeroMemory(uncompBuffer, finalLength);
	memcpy(uncompBuffer, "RIFF\0\0\0\0WAVEfmt \20\0\0\0", 20);
	memcpy(uncompBuffer + 36, "data\0\0\0\0", 8);

	WAVEFORMATEX *wf = (WAVEFORMATEX*)(uncompBuffer + 20);

	wf->wFormatTag = 3;
	wf->nChannels = info.chans;
	wf->wBitsPerSample = 32;
	wf->nSamplesPerSec = info.freq;
	wf->nBlockAlign = wf->nChannels * wf->wBitsPerSample / 8;
	wf->nAvgBytesPerSec = wf->nSamplesPerSec * wf->nBlockAlign;

	// Copy raw PCM data from temporary sample buffer to actual buffer which will be used by engine.
	BASS_SampleGetData(sample, uncompBuffer + 44);
	BASS_SampleFree(sample);

	// Cut off trailing silence from samples to prevent gaps in looped playback