squeezelite-esp32/components/spotify/cspot/bell/main/audio-sinks/unix/PortAudioSink.cpp

#include "PortAudioSink.h"

PortAudioSink::PortAudioSink()
{
    Pa_Initialize();
	this->setParams(44100, 2, 16);
}

bool PortAudioSink::setParams(uint32_t sampleRate, uint8_t channelCount, uint8_t bitDepth) {
	if (stream) {
		Pa_StopStream(stream);
	}
    PaStreamParameters outputParameters;
    outputParameters.device = Pa_GetDefaultOutputDevice();
    if (outputParameters.device == paNoDevice) {
        printf("PortAudio: Default audio device not found!\n");
        // exit(0);
    }
        printf("PortAudio: Default audio device not found!\n");

    outputParameters.channelCount = channelCount;
	switch (bitDepth) {
		case 32:
			outputParameters.sampleFormat = paInt32;
			break;
		case 24:
			outputParameters.sampleFormat = paInt24;
			break;
		case 16:
			outputParameters.sampleFormat = paInt16;
			break;
		case 8:
			outputParameters.sampleFormat = paInt8;
			break;
		default:
			outputParameters.sampleFormat = paInt16;
			break;
	}
    outputParameters.suggestedLatency = 0.050;
    outputParameters.hostApiSpecificStreamInfo = NULL;

    PaError err = Pa_OpenStream(
        &stream,
        NULL,
        &outputParameters,
		sampleRate,
        4096 / (channelCount * bitDepth / 8),
        paClipOff,
        NULL, // blocking api
        NULL
    );
    Pa_StartStream(stream);
	return !err;
}

PortAudioSink::~PortAudioSink()
{
    Pa_StopStream(stream);
    Pa_Terminate();
}

void PortAudioSink::feedPCMFrames(const uint8_t *buffer, size_t bytes)
{
    Pa_WriteStream(stream, buffer, bytes / 4);
}