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boo/lib/audiodev/PulseAudio.cpp

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#include "AudioVoiceEngine.hpp"
#include "logvisor/logvisor.hpp"
#include "boo/boo.hpp"
#include "LinuxMidi.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;
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)
{
int retval = 0;
while (pa_operation_get_state(op) == PA_OPERATION_RUNNING)
pa_mainloop_iterate(m_mainloop, 1, &retval);
return retval;
}
PulseAudioVoiceEngine()
{
if (!(m_mainloop = pa_mainloop_new()))
{
Log.report(logvisor::Error, "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, APP->getUniqueName().data());
char pidStr[16];
snprintf(pidStr, 16, "%d", int(getpid()));
pa_proplist_sets(propList, PA_PROP_APPLICATION_PROCESS_ID, pidStr);
if (!(m_ctx = pa_context_new_with_proplist(mlApi, APP->getFriendlyName().data(), propList)))
{
Log.report(logvisor::Error, "Unable to pa_context_new_with_proplist()");
pa_mainloop_free(m_mainloop);
m_mainloop = nullptr;
return;
}
pa_operation* op;
size_t periodSz;
if (pa_context_connect(m_ctx, nullptr, PA_CONTEXT_NOFLAGS, nullptr))
{
Log.report(logvisor::Error, "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);
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, "Unable to setup audio stream");
goto err;
}
m_5msFrames = m_sampleSpec.rate * 5 / 1000;
periodSz = m_5msFrames * 4;
m_mixInfo.m_sampleRate = m_sampleSpec.rate;
m_mixInfo.m_sampleFormat = SOXR_FLOAT32;
m_mixInfo.m_bitsPerSample = 32;
m_mixInfo.m_periodFrames = periodSz;
if (!(m_stream = pa_stream_new(m_ctx, "master", &m_sampleSpec, &m_chanMap)))
{
Log.report(logvisor::Error, "Unable to pa_stream_new(): %s", pa_strerror(pa_context_errno(m_ctx)));
goto err;
}
pa_buffer_attr bufAttr;
bufAttr.minreq = uint32_t(periodSz * m_sampleSpec.channels * sizeof(float));
bufAttr.maxlength = bufAttr.minreq * 6;
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, "Unable to pa_stream_connect_playback()");
goto err;
}
_paStreamWaitReady();
return;
err:
if (m_stream)
{
pa_stream_disconnect(m_stream);
pa_stream_unref(m_stream);
m_stream = nullptr;
}
pa_context_disconnect(m_ctx);
pa_context_unref(m_ctx);
m_ctx = nullptr;
pa_mainloop_free(m_mainloop);
m_mainloop = nullptr;
}
~PulseAudioVoiceEngine()
{
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 _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);
}
std::vector<float> m_finalFlt;
void pumpAndMixVoices()
{
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;
if (m_finalFlt.size() < m_5msFrames * 2)
m_finalFlt.resize(m_5msFrames * 2);
_pumpAndMixVoices(m_5msFrames, m_finalFlt.data());
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;
int retval;
if (!writablePeriods)
{
pa_mainloop_iterate(m_mainloop, 1, &retval);
return;
}
void* data;
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, "Unable to pa_stream_begin_write(): %s %d",
pa_strerror(pa_context_errno(m_ctx)), st);
pa_mainloop_iterate(m_mainloop, 1, &retval);
return;
}
writablePeriods = nbytes / periodSz;
size_t periodSamples = m_mixInfo.m_periodFrames * m_mixInfo.m_channelMap.m_channelCount;
for (int p=0 ; p<writablePeriods ; ++p)
_pumpAndMixVoices(m_mixInfo.m_periodFrames, reinterpret_cast<float*>(data) + p * periodSamples);
if (pa_stream_write(m_stream, data, nbytes, nullptr, 0, PA_SEEK_RELATIVE))
Log.report(logvisor::Error, "Unable to pa_stream_write()");
pa_mainloop_iterate(m_mainloop, 1, &retval);
}
};
std::unique_ptr<IAudioVoiceEngine> NewAudioVoiceEngine()
{
return std::make_unique<PulseAudioVoiceEngine>();
}
}
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