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glyphs-juke/src/AudioDevice.cc

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#define MINIAUDIO_IMPLEMENTATION
#include "AudioDevice.h"
#include "common.h"
gj::AudioDevice::AudioDevice() {
ma_device_config config = ma_device_config_init(ma_device_type_playback);
config.playback.format = kFormat;
config.playback.channels = kChannel;
config.sampleRate = kSampleRate;
config.dataCallback = Callback_;
config.pUserData = this;
if (ma_device_init(nullptr, &config, &ma_) != MA_SUCCESS) {
Abort("AudioDevice error");
}
ma_device_start(&ma_);
}
gj::AudioDevice::~AudioDevice() {
ma_device_stop(&ma_);
ma_device_uninit(&ma_);
/* the worker thread has been exited so no lock is necessary anymore */
if (playing_) {
ma_decoder_uninit(&dec_);
}
}
void gj::AudioDevice::PlayMusic(const std::string& path, double offset) {
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std::lock_guard _(mtx_);
if (playing_) {
ma_decoder_uninit(&dec_);
}
ma_decoder_config config = ma_decoder_config_init(kFormat, kChannel, kSampleRate);
if (ma_decoder_init_file(path.c_str(), &config, &dec_) != MA_SUCCESS) {
Abort("AudioDevice decoder error: "+path);
}
const uint64_t offset_frame = static_cast<uint64_t>(kSampleRate * offset);
if (ma_decoder_seek_to_pcm_frame(&dec_, offset_frame) != MA_SUCCESS) {
Abort("decoder seek failure");
}
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playing_ = true;
}
void gj::AudioDevice::StopMusic() {
std::lock_guard _(mtx_);
if (!playing_) return;
ma_decoder_uninit(&dec_);
playing_ = false;
}
void gj::AudioDevice::Callback_(ma_device* ma, void* out, const void* in, ma_uint32 framecnt) {
AudioDevice* dev = reinterpret_cast<AudioDevice*>(ma->pUserData);
std::lock_guard _(dev->mtx_);
const double amp = dev->amp_.load();
const double lpf = dev->lpf_coe_.load();
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float* dst = reinterpret_cast<float*>(out);
size_t wrote = 0;
if (dev->playing_) {
const ma_uint64 n = ma_decoder_read_pcm_frames(&dev->dec_, dst, framecnt);
if (n < framecnt) {
dev->playing_ = false;
ma_decoder_uninit(&dev->dec_);
}
wrote += n;
}
for (size_t i = 0; i < static_cast<size_t>(framecnt)*kChannel; ++i) {
dst[i] = static_cast<float>(dst[i]*amp);
dst[i] = static_cast<float>(dev->lpf_prev_*lpf + dst[i]*(1-lpf));
dev->lpf_prev_ = dst[i];
}
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dev->time_.fetch_add(framecnt);
}