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/***
This file is part of snapcast
Copyright (C) 2014-2023 Johannes Pohl
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
***/
// prototype/interface header file
#include "coreaudio_player.hpp"
// local headers
#include "common/aixlog.hpp"
// 3rd party headers
#include <CoreAudio/CoreAudio.h>
namespace player
{
#define NUM_BUFFERS 2
static constexpr auto LOG_TAG = "CoreAudioPlayer";
// http://stackoverflow.com/questions/4863811/how-to-use-audioqueue-to-play-a-sound-for-mac-osx-in-c
// https://gist.github.com/andormade/1360885
void callback(void* custom_data, AudioQueueRef queue, AudioQueueBufferRef buffer)
{
CoreAudioPlayer* player = static_cast<CoreAudioPlayer*>(custom_data);
player->playerCallback(queue, buffer);
}
CoreAudioPlayer::CoreAudioPlayer(boost::asio::io_context& io_context, const ClientSettings::Player& settings, std::shared_ptr<Stream> stream)
: Player(io_context, settings, stream), ms_(100), pubStream_(stream)
{
}
CoreAudioPlayer::~CoreAudioPlayer()
{
}
/// TODO: experimental. No output device can be configured yet.
std::vector<PcmDevice> CoreAudioPlayer::pcm_list()
{
UInt32 propsize;
AudioObjectPropertyAddress theAddress = {kAudioHardwarePropertyDevices, kAudioObjectPropertyScopeGlobal, kAudioObjectPropertyElementMaster};
AudioObjectGetPropertyDataSize(kAudioObjectSystemObject, &theAddress, 0, NULL, &propsize);
int nDevices = propsize / sizeof(AudioDeviceID);
AudioDeviceID* devids = new AudioDeviceID[nDevices];
AudioObjectGetPropertyData(kAudioObjectSystemObject, &theAddress, 0, NULL, &propsize, devids);
std::vector<PcmDevice> result;
for (int i = 0; i < nDevices; ++i)
{
if (devids[i] == kAudioDeviceUnknown)
continue;
UInt32 propSize;
AudioObjectPropertyAddress theAddress = {kAudioDevicePropertyStreamConfiguration, kAudioDevicePropertyScopeOutput, 0};
if (AudioObjectGetPropertyDataSize(devids[i], &theAddress, 0, NULL, &propSize))
continue;
AudioBufferList* buflist = new AudioBufferList[propSize];
if (AudioObjectGetPropertyData(devids[i], &theAddress, 0, NULL, &propSize, buflist))
continue;
int channels = 0;
for (UInt32 i = 0; i < buflist->mNumberBuffers; ++i)
channels += buflist->mBuffers[i].mNumberChannels;
delete[] buflist;
if (channels == 0)
continue;
UInt32 maxlen = 1024;
char buf[1024];
theAddress = {kAudioDevicePropertyDeviceName, kAudioDevicePropertyScopeOutput, 0};
AudioObjectGetPropertyData(devids[i], &theAddress, 0, NULL, &maxlen, buf);
LOG(DEBUG, LOG_TAG) << "device: " << i << ", name: " << buf << ", channels: " << channels << "\n";
result.push_back(PcmDevice(i, buf));
}
delete[] devids;
return result;
}
void CoreAudioPlayer::playerCallback(AudioQueueRef queue, AudioQueueBufferRef bufferRef)
{
/// Estimate the playout delay by checking the number of frames left in the buffer
/// and add ms_ (= complete buffer size). Based on trying.
AudioTimeStamp timestamp;
AudioQueueGetCurrentTime(queue, timeLine_, ×tamp, NULL);
size_t bufferedFrames = (frames_ - ((uint64_t)timestamp.mSampleTime % frames_)) % frames_;
size_t bufferedMs = bufferedFrames * 1000 / pubStream_->getFormat().rate() + (ms_ * (NUM_BUFFERS - 1));
/// 15ms DAC delay. Based on trying.
bufferedMs += 15;
// LOG(INFO, LOG_TAG) << "buffered: " << bufferedFrames << ", ms: " << bufferedMs << ", mSampleTime: " << timestamp.mSampleTime << "\n";
/// TODO: sometimes this bufferedMS or AudioTimeStamp wraps around 1s (i.e. we're 1s out of sync (behind)) and recovers later on
chronos::usec delay(bufferedMs * 1000);
char* buffer = (char*)bufferRef->mAudioData;
if (!pubStream_->getPlayerChunkOrSilence(buffer, delay, frames_))
{
if (chronos::getTickCount() - lastChunkTick > 5000)
{
LOG(NOTICE, LOG_TAG) << "No chunk received for 5000ms. Closing Audio Queue.\n";
uninitAudioQueue(queue);
return;
}
// LOG(INFO, LOG_TAG) << "Failed to get chunk. Playing silence.\n";
}
else
{
lastChunkTick = chronos::getTickCount();
adjustVolume(buffer, frames_);
}
// OSStatus status =
AudioQueueEnqueueBuffer(queue, bufferRef, 0, NULL);
if (!active_)
{
uninitAudioQueue(queue);
}
}
bool CoreAudioPlayer::needsThread() const
{
return true;
}
void CoreAudioPlayer::worker()
{
while (active_)
{
if (pubStream_->waitForChunk(std::chrono::milliseconds(100)))
{
try
{
initAudioQueue();
}
catch (const std::exception& e)
{
LOG(ERROR, LOG_TAG) << "Exception in worker: " << e.what() << "\n";
chronos::sleep(100);
}
}
chronos::sleep(100);
}
}
void CoreAudioPlayer::initAudioQueue()
{
const SampleFormat& sampleFormat = pubStream_->getFormat();
AudioStreamBasicDescription format;
format.mSampleRate = sampleFormat.rate();
format.mFormatID = kAudioFormatLinearPCM;
format.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger; // | kAudioFormatFlagIsPacked;
format.mBitsPerChannel = sampleFormat.bits();
format.mChannelsPerFrame = sampleFormat.channels();
format.mBytesPerFrame = sampleFormat.frameSize();
format.mFramesPerPacket = 1;
format.mBytesPerPacket = format.mBytesPerFrame * format.mFramesPerPacket;
format.mReserved = 0;
AudioQueueRef queue;
AudioQueueNewOutput(&format, callback, this, CFRunLoopGetCurrent(), kCFRunLoopCommonModes, 0, &queue);
AudioQueueCreateTimeline(queue, &timeLine_);
// Apple recommends this as buffer size:
// https://developer.apple.com/library/content/documentation/MusicAudio/Conceptual/CoreAudioOverview/CoreAudioEssentials/CoreAudioEssentials.html
// static const int maxBufferSize = 0x10000; // limit maximum size to 64K
// static const int minBufferSize = 0x4000; // limit minimum size to 16K
//
// For 100ms @ 48000:16:2 we have 19.2K
// frames: 4800, ms: 100, buffer size: 19200
frames_ = (sampleFormat.rate() * ms_) / 1000;
ms_ = frames_ * 1000 / sampleFormat.rate();
buff_size_ = frames_ * sampleFormat.frameSize();
LOG(INFO, LOG_TAG) << "frames: " << frames_ << ", ms: " << ms_ << ", buffer size: " << buff_size_ << "\n";
AudioQueueBufferRef buffers[NUM_BUFFERS];
for (int i = 0; i < NUM_BUFFERS; i++)
{
AudioQueueAllocateBuffer(queue, buff_size_, &buffers[i]);
buffers[i]->mAudioDataByteSize = buff_size_;
callback(this, queue, buffers[i]);
}
LOG(DEBUG, LOG_TAG) << "CoreAudioPlayer::worker\n";
AudioQueueCreateTimeline(queue, &timeLine_);
AudioQueueStart(queue, NULL);
CFRunLoopRun();
}
void CoreAudioPlayer::uninitAudioQueue(AudioQueueRef queue)
{
AudioQueueStop(queue, false);
AudioQueueDispose(queue, false);
pubStream_->clearChunks();
CFRunLoopStop(CFRunLoopGetCurrent());
}
} // namespace player
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