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boo/lib/audiodev/PulseAudio.cpp

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#include "lib/audiodev/AudioVoiceEngine.hpp"
#include "lib/audiodev/LinuxMidi.hpp"
#include <logvisor/logvisor.hpp>
#include <pulse/pulseaudio.h>
#include <unistd.h>
namespace boo {
static logvisor::Module Log("boo::PulseAudio");
logvisor::Module ALSALog("boo::ALSA");
static const uint64_t StereoChans = (1 << PA_CHANNEL_POSITION_FRONT_LEFT) | (1 << PA_CHANNEL_POSITION_FRONT_RIGHT);
static const uint64_t QuadChans = (1 << PA_CHANNEL_POSITION_FRONT_LEFT) | (1 << PA_CHANNEL_POSITION_FRONT_RIGHT) |
(1 << PA_CHANNEL_POSITION_REAR_LEFT) | (1 << PA_CHANNEL_POSITION_REAR_RIGHT);
static const uint64_t S51Chans = (1 << PA_CHANNEL_POSITION_FRONT_LEFT) | (1 << PA_CHANNEL_POSITION_FRONT_RIGHT) |
(1 << PA_CHANNEL_POSITION_REAR_LEFT) | (1 << PA_CHANNEL_POSITION_REAR_RIGHT) |
(1 << PA_CHANNEL_POSITION_FRONT_CENTER) | (1 << PA_CHANNEL_POSITION_LFE);
static const uint64_t S71Chans = (1 << PA_CHANNEL_POSITION_FRONT_LEFT) | (1 << PA_CHANNEL_POSITION_FRONT_RIGHT) |
(1 << PA_CHANNEL_POSITION_REAR_LEFT) | (1 << PA_CHANNEL_POSITION_REAR_RIGHT) |
(1 << PA_CHANNEL_POSITION_FRONT_CENTER) | (1 << PA_CHANNEL_POSITION_LFE) |
(1 << PA_CHANNEL_POSITION_SIDE_LEFT) | (1 << PA_CHANNEL_POSITION_SIDE_RIGHT);
struct PulseAudioVoiceEngine : LinuxMidi {
pa_mainloop* m_mainloop = nullptr;
pa_context* m_ctx = nullptr;
pa_stream* m_stream = nullptr;
std::string m_sinkName;
bool m_handleMove = false;
pa_sample_spec m_sampleSpec = {};
pa_channel_map m_chanMap = {};
int _paWaitReady() {
int retval = 0;
while (pa_context_get_state(m_ctx) < PA_CONTEXT_READY)
pa_mainloop_iterate(m_mainloop, 1, &retval);
return retval;
}
int _paStreamWaitReady() {
int retval = 0;
while (pa_stream_get_state(m_stream) < PA_STREAM_READY)
pa_mainloop_iterate(m_mainloop, 1, &retval);
return retval;
}
int _paIterate(pa_operation* op) const {
int retval = 0;
while (pa_operation_get_state(op) == PA_OPERATION_RUNNING)
pa_mainloop_iterate(m_mainloop, 1, &retval);
return retval;
}
bool _setupSink() {
if (m_stream) {
pa_stream_disconnect(m_stream);
pa_stream_unref(m_stream);
m_stream = nullptr;
}
pa_operation* op;
m_sampleSpec.format = PA_SAMPLE_INVALID;
op = pa_context_get_sink_info_by_name(m_ctx, m_sinkName.c_str(), pa_sink_info_cb_t(_getSinkInfoReply), this);
_paIterate(op);
pa_operation_unref(op);
if (m_sampleSpec.format == PA_SAMPLE_INVALID) {
Log.report(logvisor::Error, FMT_STRING("Unable to setup audio stream"));
goto err;
}
m_5msFrames = m_sampleSpec.rate * 5 / 1000;
m_mixInfo.m_sampleRate = m_sampleSpec.rate;
m_mixInfo.m_sampleFormat = SOXR_FLOAT32;
m_mixInfo.m_bitsPerSample = 32;
m_mixInfo.m_periodFrames = m_5msFrames;
if (!(m_stream = pa_stream_new(m_ctx, "master", &m_sampleSpec, &m_chanMap))) {
Log.report(logvisor::Error, FMT_STRING("Unable to pa_stream_new(): {}"), pa_strerror(pa_context_errno(m_ctx)));
goto err;
}
pa_buffer_attr bufAttr;
bufAttr.minreq = uint32_t(m_5msFrames * m_sampleSpec.channels * sizeof(float));
bufAttr.maxlength = bufAttr.minreq * 24;
bufAttr.tlength = bufAttr.maxlength;
bufAttr.prebuf = UINT32_MAX;
bufAttr.fragsize = UINT32_MAX;
if (pa_stream_connect_playback(m_stream, m_sinkName.c_str(), &bufAttr,
pa_stream_flags_t(PA_STREAM_START_UNMUTED | PA_STREAM_EARLY_REQUESTS), nullptr,
nullptr)) {
Log.report(logvisor::Error, FMT_STRING("Unable to pa_stream_connect_playback()"));
goto err;
}
pa_stream_set_moved_callback(m_stream, pa_stream_notify_cb_t(_streamMoved), this);
_paStreamWaitReady();
_resetSampleRate();
return true;
err:
if (m_stream) {
pa_stream_disconnect(m_stream);
pa_stream_unref(m_stream);
m_stream = nullptr;
}
return false;
}
PulseAudioVoiceEngine(const char* uniqueName, const char* friendlyName) {
if (!(m_mainloop = pa_mainloop_new())) {
Log.report(logvisor::Error, FMT_STRING("Unable to pa_mainloop_new()"));
return;
}
pa_mainloop_api* mlApi = pa_mainloop_get_api(m_mainloop);
pa_proplist* propList = pa_proplist_new();
pa_proplist_sets(propList, PA_PROP_APPLICATION_ICON_NAME, uniqueName);
pa_proplist_sets(propList, PA_PROP_APPLICATION_PROCESS_ID, fmt::format(FMT_STRING("{}"), int(getpid())).c_str());
if (!(m_ctx = pa_context_new_with_proplist(mlApi, friendlyName, propList))) {
Log.report(logvisor::Error, FMT_STRING("Unable to pa_context_new_with_proplist()"));
pa_mainloop_free(m_mainloop);
m_mainloop = nullptr;
return;
}
pa_proplist_free(propList);
pa_operation* op;
if (pa_context_connect(m_ctx, nullptr, PA_CONTEXT_NOFLAGS, nullptr)) {
Log.report(logvisor::Error, FMT_STRING("Unable to pa_context_connect()"));
goto err;
}
_paWaitReady();
op = pa_context_get_server_info(m_ctx, pa_server_info_cb_t(_getServerInfoReply), this);
_paIterate(op);
pa_operation_unref(op);
if (!_setupSink())
goto err;
return;
err:
pa_context_disconnect(m_ctx);
pa_context_unref(m_ctx);
m_ctx = nullptr;
pa_mainloop_free(m_mainloop);
m_mainloop = nullptr;
}
~PulseAudioVoiceEngine() override {
if (m_stream) {
pa_stream_disconnect(m_stream);
pa_stream_unref(m_stream);
}
if (m_ctx) {
pa_context_disconnect(m_ctx);
pa_context_unref(m_ctx);
}
if (m_mainloop) {
pa_mainloop_free(m_mainloop);
}
}
static void _streamMoved(pa_stream* p, PulseAudioVoiceEngine* userdata) {
userdata->m_sinkName = pa_stream_get_device_name(p);
userdata->m_handleMove = true;
}
static void _getServerInfoReply(pa_context* c, const pa_server_info* i, PulseAudioVoiceEngine* userdata) {
userdata->m_sinkName = i->default_sink_name;
}
void _parseAudioChannelSet(const pa_channel_map* chm) {
m_chanMap = *chm;
ChannelMap& chmapOut = m_mixInfo.m_channelMap;
m_mixInfo.m_channels = AudioChannelSet::Unknown;
uint64_t chBits = 0;
chmapOut.m_channelCount = chm->channels;
for (unsigned c = 0; c < chm->channels; ++c) {
chBits |= 1 << chm->map[c];
switch (chm->map[c]) {
case PA_CHANNEL_POSITION_FRONT_LEFT:
chmapOut.m_channels[c] = AudioChannel::FrontLeft;
break;
case PA_CHANNEL_POSITION_FRONT_RIGHT:
chmapOut.m_channels[c] = AudioChannel::FrontRight;
break;
case PA_CHANNEL_POSITION_REAR_LEFT:
chmapOut.m_channels[c] = AudioChannel::RearLeft;
break;
case PA_CHANNEL_POSITION_REAR_RIGHT:
chmapOut.m_channels[c] = AudioChannel::RearRight;
break;
case PA_CHANNEL_POSITION_FRONT_CENTER:
chmapOut.m_channels[c] = AudioChannel::FrontCenter;
break;
case PA_CHANNEL_POSITION_LFE:
chmapOut.m_channels[c] = AudioChannel::LFE;
break;
case PA_CHANNEL_POSITION_SIDE_LEFT:
chmapOut.m_channels[c] = AudioChannel::SideLeft;
break;
case PA_CHANNEL_POSITION_SIDE_RIGHT:
chmapOut.m_channels[c] = AudioChannel::SideRight;
break;
default:
chmapOut.m_channels[c] = AudioChannel::Unknown;
break;
}
}
static const std::array<AudioChannelSet, 4> testSets = {
{AudioChannelSet::Surround71, AudioChannelSet::Surround51, AudioChannelSet::Quad, AudioChannelSet::Stereo}};
for (AudioChannelSet set : testSets) {
switch (set) {
case AudioChannelSet::Stereo: {
if ((chBits & StereoChans) == StereoChans) {
m_mixInfo.m_channels = AudioChannelSet::Stereo;
return;
}
break;
}
case AudioChannelSet::Quad: {
if ((chBits & QuadChans) == QuadChans) {
m_mixInfo.m_channels = AudioChannelSet::Quad;
return;
}
break;
}
case AudioChannelSet::Surround51: {
if ((chBits & S51Chans) == S51Chans) {
m_mixInfo.m_channels = AudioChannelSet::Surround51;
return;
}
break;
}
case AudioChannelSet::Surround71: {
if ((chBits & S71Chans) == S71Chans) {
m_mixInfo.m_channels = AudioChannelSet::Surround71;
return;
}
break;
}
default:
break;
}
}
}
static void _getSinkInfoReply(pa_context* c, const pa_sink_info* i, int eol, PulseAudioVoiceEngine* userdata) {
if (!i)
return;
userdata->m_sampleSpec.format = PA_SAMPLE_FLOAT32;
userdata->m_sampleSpec.rate = i->sample_spec.rate;
userdata->m_sampleSpec.channels = i->sample_spec.channels;
userdata->_parseAudioChannelSet(&i->channel_map);
}
mutable std::vector<std::pair<std::string, std::string>> m_sinks;
static void _getSinkInfoListReply(pa_context* c, const pa_sink_info* i, int eol, PulseAudioVoiceEngine* userdata) {
if (i)
userdata->m_sinks.push_back(std::make_pair(i->name, i->description));
}
std::vector<std::pair<std::string, std::string>> enumerateAudioOutputs() const override {
pa_operation* op = pa_context_get_sink_info_list(m_ctx, pa_sink_info_cb_t(_getSinkInfoListReply), (void*)this);
_paIterate(op);
pa_operation_unref(op);
std::vector<std::pair<std::string, std::string>> ret;
ret.swap(m_sinks);
return ret;
}
std::string getCurrentAudioOutput() const override { return m_sinkName; }
bool m_sinkOk = false;
static void _checkAudioSinkReply(pa_context* c, const pa_sink_info* i, int eol, PulseAudioVoiceEngine* userdata) {
if (i)
userdata->m_sinkOk = true;
}
bool setCurrentAudioOutput(const char* name) override {
m_sinkOk = false;
pa_operation* op;
op = pa_context_get_sink_info_by_name(m_ctx, name, pa_sink_info_cb_t(_checkAudioSinkReply), this);
_paIterate(op);
pa_operation_unref(op);
if (m_sinkOk) {
m_sinkName = name;
return _setupSink();
}
return false;
}
void _doIterate() {
int retval;
pa_mainloop_iterate(m_mainloop, 1, &retval);
if (m_handleMove) {
m_handleMove = false;
_setupSink();
}
}
void pumpAndMixVoices() override {
if (!m_stream) {
/* Dummy pump mode - use failsafe defaults for 1/60sec of samples */
m_mixInfo.m_sampleRate = 32000.0;
m_mixInfo.m_sampleFormat = SOXR_FLOAT32_I;
m_mixInfo.m_bitsPerSample = 32;
m_5msFrames = 32000 / 60;
m_mixInfo.m_periodFrames = m_5msFrames;
m_mixInfo.m_channels = AudioChannelSet::Stereo;
m_mixInfo.m_channelMap.m_channelCount = 2;
m_mixInfo.m_channelMap.m_channels[0] = AudioChannel::FrontLeft;
m_mixInfo.m_channelMap.m_channels[1] = AudioChannel::FrontRight;
_pumpAndMixVoices(m_5msFrames, (float*)nullptr);
return;
}
size_t writableSz = pa_stream_writable_size(m_stream);
size_t frameSz = m_mixInfo.m_channelMap.m_channelCount * sizeof(float);
size_t writableFrames = writableSz / frameSz;
size_t writablePeriods = writableFrames / m_mixInfo.m_periodFrames;
if (!writablePeriods) {
_doIterate();
return;
}
void* data = nullptr;
size_t periodSz = m_mixInfo.m_periodFrames * frameSz;
size_t nbytes = writablePeriods * periodSz;
if (pa_stream_begin_write(m_stream, &data, &nbytes)) {
pa_stream_state_t st = pa_stream_get_state(m_stream);
Log.report(logvisor::Error, FMT_STRING("Unable to pa_stream_begin_write(): {} {}"),
pa_strerror(pa_context_errno(m_ctx)), st);
_doIterate();
return;
}
writablePeriods = nbytes / periodSz;
_pumpAndMixVoices(m_mixInfo.m_periodFrames * writablePeriods, reinterpret_cast<float*>(data));
if (pa_stream_write(m_stream, data, nbytes, nullptr, 0, PA_SEEK_RELATIVE))
Log.report(logvisor::Error, FMT_STRING("Unable to pa_stream_write()"));
_doIterate();
}
};
std::unique_ptr<IAudioVoiceEngine> NewAudioVoiceEngine(const char* uniqueName, const char* friendlyName) {
return std::make_unique<PulseAudioVoiceEngine>(uniqueName, friendlyName);
}
} // namespace boo
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