Function ConvertAudio

framework/sound/sdlraw_backend.cpp:36–82

'samples' must already be large enough to contain the full output size

// 'samples' must already be large enough to contain the full output size
static bool ConvertAudio(AudioFormat input_format, SDL_AudioSpec &output_spec, int input_size_bytes,
                         std::vector<unsigned char> &samples)
{
	SDL_AudioCVT cvt;
	SDL_AudioFormat sdl_input_format;
	switch (input_format.format)
	{
		case AudioFormat::SampleFormat::PCM_SINT16:
			sdl_input_format = AUDIO_S16LSB;
			break;
		case AudioFormat::SampleFormat::PCM_UINT8:
			sdl_input_format = AUDIO_U8;
			break;
		default:
			LogWarning("Unknown input sample format");
			return false;
	}

	int ret =
	    SDL_BuildAudioCVT(&cvt, sdl_input_format, input_format.channels, input_format.frequency,
	                      output_spec.format, output_spec.channels, output_spec.freq);
	if (ret < 0)
	{
		LogWarning("Failed to build AudioCVT");
		return false;
	}
	else if (ret == 0)
	{
		// No conversion needed
		return true;
	}
	else
	{
		cvt.len = input_size_bytes;
		size_t neededSize = std::max(1, cvt.len_mult) * cvt.len;
		if (samples.size() < neededSize)
		{
			LogInfo("Expanding sample output buffer from %zu to %zu bytes", samples.size(),
			        neededSize);
			samples.resize(neededSize);
		}
		cvt.buf = (Uint8 *)samples.data();
		SDL_ConvertAudio(&cvt);
		samples.resize(cvt.len_cvt);
		return true;
	}
}

class SDLSampleData : public BackendSampleData
{