Method writeAudio

platform/sdl/kdspaudio.cpp:287–319

}

U32 KDspAudioSdl::writeAudio(U8* data, U32 len) {
	U32 bytesPerSecond = want.freq * want.channels * bytesPerSampleWant();
	U32 delay = bytesPerSecond / 8;

	if (!KSystem::soundEnabled) {
		static U32 timeSinceLastWrite;

		U32 elapsedTime = KSystem::getMilliesSinceStart() - timeSinceLastWrite;
		U32 bytesToRemove = bytesPerSecond * elapsedTime / 1000;
		
		bytesToRemove = std::min((U32)this->audioBuffer.size(), bytesToRemove);
		this->audioBuffer.erase(this->audioBuffer.begin(), this->audioBuffer.begin() + bytesToRemove);

		if (this->audioBuffer.size() > delay) {
			return -K_EWOULDBLOCK;
		}
		U32 blockSize = bytesPerSampleWant() * want.channels;
		len = std::min(len, ((delay - (U32)this->audioBuffer.size()) & ~(blockSize - 1)));
		audioBuffer.insert(this->audioBuffer.end(), data, data + len);
		timeSinceLastWrite = KSystem::getMilliesSinceStart();
		return len;
	}
	SDL_LockAudio();
	if (this->audioBuffer.size() > delay) {
		SDL_UnlockAudio();
		return -K_EWOULDBLOCK;
	}
	U32 blockSize = bytesPerSampleWant() * want.channels;
	len = std::min(len, ((delay - (U32)this->audioBuffer.size()) & ~(blockSize - 1)));
	audioBuffer.insert(this->audioBuffer.end(), data, data + len);
	SDL_UnlockAudio();
	return len;	
}

static U32 nextId = 0;
BOXEDWINE_MUTEX KDspAudio::mutex;