371 lines
8.8 KiB
C++
371 lines
8.8 KiB
C++
/*******************************************************************************
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* Copyright 2009-2016 Jörg Müller
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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******************************************************************************/
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#include "PulseAudioDevice.h"
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#include "PulseAudioLibrary.h"
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#include "devices/DeviceManager.h"
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#include "devices/IDeviceFactory.h"
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#include "Exception.h"
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#include "IReader.h"
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AUD_NAMESPACE_BEGIN
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PulseAudioDevice::PulseAudioSynchronizer::PulseAudioSynchronizer(PulseAudioDevice *device) :
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m_device(device)
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{
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}
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double PulseAudioDevice::PulseAudioSynchronizer::getPosition(std::shared_ptr<IHandle> handle)
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{
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pa_usec_t latency;
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int negative;
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AUD_pa_stream_get_latency(m_device->m_stream, &latency, &negative);
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double delay = m_device->m_ring_buffer.getReadSize() / (AUD_SAMPLE_SIZE(m_device->m_specs) * m_device->m_specs.rate) + latency * 1.0e-6;
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return handle->getPosition() - delay;
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}
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void PulseAudioDevice::updateRingBuffer()
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{
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unsigned int samplesize = AUD_DEVICE_SAMPLE_SIZE(m_specs);
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std::unique_lock<std::mutex> lock(m_mixingLock);
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Buffer buffer;
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while(m_valid)
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{
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{
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std::lock_guard<ILockable> device_lock(*this);
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if(m_playback)
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{
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size_t size = m_ring_buffer.getWriteSize();
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size_t sample_count = size / samplesize;
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if(sample_count > 0)
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{
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size = sample_count * samplesize;
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buffer.assureSize(size);
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mix(reinterpret_cast<data_t*>(buffer.getBuffer()), sample_count);
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m_ring_buffer.write(reinterpret_cast<data_t*>(buffer.getBuffer()), size);
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}
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}
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else
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{
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if(m_ring_buffer.getReadSize() == 0)
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{
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AUD_pa_threaded_mainloop_lock(m_mainloop);
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AUD_pa_stream_cork(m_stream, 1, nullptr, nullptr);
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AUD_pa_stream_flush(m_stream, nullptr, nullptr);
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AUD_pa_threaded_mainloop_unlock(m_mainloop);
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}
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}
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}
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m_mixingCondition.wait(lock);
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}
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}
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void PulseAudioDevice::PulseAudio_state_callback(pa_context *context, void *data)
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{
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PulseAudioDevice* device = (PulseAudioDevice*)data;
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device->m_state = AUD_pa_context_get_state(context);
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AUD_pa_threaded_mainloop_signal(device->m_mainloop, 0);
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}
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void PulseAudioDevice::PulseAudio_request(pa_stream *stream, size_t total_bytes, void *data)
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{
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PulseAudioDevice* device = (PulseAudioDevice*)data;
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data_t* buffer;
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size_t sample_size = AUD_DEVICE_SAMPLE_SIZE(device->m_specs);
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while(total_bytes > 0)
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{
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size_t num_bytes = total_bytes;
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AUD_pa_stream_begin_write(stream, reinterpret_cast<void**>(&buffer), &num_bytes);
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size_t readsamples = device->m_ring_buffer.getReadSize();
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readsamples = std::min(readsamples, size_t(num_bytes)) / sample_size;
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device->m_ring_buffer.read(buffer, readsamples * sample_size);
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if(readsamples * sample_size < num_bytes)
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std::memset(buffer + readsamples * sample_size, 0, num_bytes - readsamples * sample_size);
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if(device->m_mixingLock.try_lock())
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{
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device->m_mixingCondition.notify_all();
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device->m_mixingLock.unlock();
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}
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AUD_pa_stream_write(stream, reinterpret_cast<void*>(buffer), num_bytes, nullptr, 0, PA_SEEK_RELATIVE);
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total_bytes -= num_bytes;
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}
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}
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void PulseAudioDevice::playing(bool playing)
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{
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std::lock_guard<ILockable> lock(*this);
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m_playback = playing;
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if(playing)
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{
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AUD_pa_threaded_mainloop_lock(m_mainloop);
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AUD_pa_stream_cork(m_stream, 0, nullptr, nullptr);
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AUD_pa_threaded_mainloop_unlock(m_mainloop);
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}
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}
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PulseAudioDevice::PulseAudioDevice(const std::string &name, DeviceSpecs specs, int buffersize) :
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m_synchronizer(this),
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m_playback(false),
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m_state(PA_CONTEXT_UNCONNECTED),
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m_valid(true),
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m_underflows(0)
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{
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m_mainloop = AUD_pa_threaded_mainloop_new();
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AUD_pa_threaded_mainloop_lock(m_mainloop);
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m_context = AUD_pa_context_new(AUD_pa_threaded_mainloop_get_api(m_mainloop), name.c_str());
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if(!m_context)
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{
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AUD_pa_threaded_mainloop_unlock(m_mainloop);
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AUD_pa_threaded_mainloop_free(m_mainloop);
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AUD_THROW(DeviceException, "Could not connect to PulseAudio.");
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}
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AUD_pa_context_set_state_callback(m_context, PulseAudio_state_callback, this);
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AUD_pa_context_connect(m_context, nullptr, PA_CONTEXT_NOFLAGS, nullptr);
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AUD_pa_threaded_mainloop_start(m_mainloop);
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while(m_state != PA_CONTEXT_READY)
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{
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switch(m_state)
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{
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case PA_CONTEXT_FAILED:
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case PA_CONTEXT_TERMINATED:
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AUD_pa_threaded_mainloop_unlock(m_mainloop);
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AUD_pa_threaded_mainloop_stop(m_mainloop);
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AUD_pa_context_disconnect(m_context);
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AUD_pa_context_unref(m_context);
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AUD_pa_threaded_mainloop_free(m_mainloop);
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AUD_THROW(DeviceException, "Could not connect to PulseAudio.");
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break;
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default:
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AUD_pa_threaded_mainloop_wait(m_mainloop);
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break;
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}
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}
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if(specs.channels == CHANNELS_INVALID)
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specs.channels = CHANNELS_STEREO;
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if(specs.format == FORMAT_INVALID)
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specs.format = FORMAT_FLOAT32;
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if(specs.rate == RATE_INVALID)
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specs.rate = RATE_48000;
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m_specs = specs;
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pa_sample_spec sample_spec;
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sample_spec.channels = specs.channels;
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sample_spec.format = PA_SAMPLE_FLOAT32;
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sample_spec.rate = specs.rate;
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switch(m_specs.format)
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{
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case FORMAT_U8:
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sample_spec.format = PA_SAMPLE_U8;
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break;
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case FORMAT_S16:
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sample_spec.format = PA_SAMPLE_S16NE;
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break;
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case FORMAT_S24:
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sample_spec.format = PA_SAMPLE_S24NE;
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break;
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case FORMAT_S32:
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sample_spec.format = PA_SAMPLE_S32NE;
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break;
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case FORMAT_FLOAT32:
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sample_spec.format = PA_SAMPLE_FLOAT32;
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break;
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case FORMAT_FLOAT64:
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m_specs.format = FORMAT_FLOAT32;
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break;
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default:
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break;
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}
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m_stream = AUD_pa_stream_new(m_context, "Playback", &sample_spec, nullptr);
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if(!m_stream)
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{
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AUD_pa_threaded_mainloop_unlock(m_mainloop);
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AUD_pa_threaded_mainloop_stop(m_mainloop);
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AUD_pa_context_disconnect(m_context);
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AUD_pa_context_unref(m_context);
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AUD_pa_threaded_mainloop_free(m_mainloop);
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AUD_THROW(DeviceException, "Could not create PulseAudio stream.");
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}
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AUD_pa_stream_set_write_callback(m_stream, PulseAudio_request, this);
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buffersize *= AUD_DEVICE_SAMPLE_SIZE(m_specs);
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m_buffersize = buffersize;
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pa_buffer_attr buffer_attr;
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buffer_attr.fragsize = -1U;
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buffer_attr.maxlength = -1U;
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buffer_attr.minreq = -1U;
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buffer_attr.prebuf = -1U;
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buffer_attr.tlength = buffersize;
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m_ring_buffer.resize(buffersize);
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if(AUD_pa_stream_connect_playback(m_stream, nullptr, &buffer_attr, static_cast<pa_stream_flags_t>(PA_STREAM_INTERPOLATE_TIMING | PA_STREAM_ADJUST_LATENCY | PA_STREAM_AUTO_TIMING_UPDATE), nullptr, nullptr) < 0)
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{
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AUD_pa_threaded_mainloop_unlock(m_mainloop);
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AUD_pa_threaded_mainloop_stop(m_mainloop);
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AUD_pa_context_disconnect(m_context);
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AUD_pa_context_unref(m_context);
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AUD_pa_threaded_mainloop_free(m_mainloop);
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AUD_THROW(DeviceException, "Could not connect PulseAudio stream.");
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}
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AUD_pa_threaded_mainloop_unlock(m_mainloop);
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create();
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m_mixingThread = std::thread(&PulseAudioDevice::updateRingBuffer, this);
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}
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PulseAudioDevice::~PulseAudioDevice()
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{
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m_valid = false;
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m_mixingLock.lock();
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m_mixingCondition.notify_all();
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m_mixingLock.unlock();
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m_mixingThread.join();
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AUD_pa_threaded_mainloop_stop(m_mainloop);
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AUD_pa_context_disconnect(m_context);
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AUD_pa_context_unref(m_context);
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AUD_pa_threaded_mainloop_free(m_mainloop);
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destroy();
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}
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ISynchronizer *PulseAudioDevice::getSynchronizer()
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{
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return &m_synchronizer;
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}
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class PulseAudioDeviceFactory : public IDeviceFactory
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{
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private:
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DeviceSpecs m_specs;
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int m_buffersize;
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std::string m_name;
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public:
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PulseAudioDeviceFactory() :
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m_buffersize(AUD_DEFAULT_BUFFER_SIZE),
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m_name("Audaspace")
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{
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m_specs.format = FORMAT_FLOAT32;
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m_specs.channels = CHANNELS_STEREO;
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m_specs.rate = RATE_48000;
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}
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virtual std::shared_ptr<IDevice> openDevice()
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{
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return std::shared_ptr<IDevice>(new PulseAudioDevice(m_name, m_specs, m_buffersize));
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}
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virtual int getPriority()
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{
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return 1 << 15;
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}
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virtual void setSpecs(DeviceSpecs specs)
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{
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m_specs = specs;
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}
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virtual void setBufferSize(int buffersize)
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{
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m_buffersize = buffersize;
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}
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virtual void setName(const std::string &name)
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{
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m_name = name;
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}
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};
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void PulseAudioDevice::registerPlugin()
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{
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if(loadPulseAudio())
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DeviceManager::registerDevice("PulseAudio", std::shared_ptr<IDeviceFactory>(new PulseAudioDeviceFactory));
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}
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#ifdef PULSEAUDIO_PLUGIN
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extern "C" AUD_PLUGIN_API void registerPlugin()
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{
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PulseAudioDevice::registerPlugin();
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}
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extern "C" AUD_PLUGIN_API const char* getName()
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{
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return "PulseAudio";
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}
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#endif
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AUD_NAMESPACE_END
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