diff options
Diffstat (limited to 'src/multimedia/alsa/qalsaaudiosink.cpp')
| -rw-r--r-- | src/multimedia/alsa/qalsaaudiosink.cpp | 698 |
1 files changed, 698 insertions, 0 deletions
diff --git a/src/multimedia/alsa/qalsaaudiosink.cpp b/src/multimedia/alsa/qalsaaudiosink.cpp new file mode 100644 index 000000000..e515219a2 --- /dev/null +++ b/src/multimedia/alsa/qalsaaudiosink.cpp @@ -0,0 +1,698 @@ +// Copyright (C) 2016 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only + +// +// W A R N I N G +// ------------- +// +// This file is not part of the Qt API. It exists for the convenience +// of other Qt classes. This header file may change from version to +// version without notice, or even be removed. +// +// INTERNAL USE ONLY: Do NOT use for any other purpose. +// + +#include <QtCore/qcoreapplication.h> +#include <QtCore/qvarlengtharray.h> +#include <QtMultimedia/private/qaudiohelpers_p.h> +#include "qalsaaudiosink_p.h" +#include "qalsaaudiodevice_p.h" +#include <QLoggingCategory> + +QT_BEGIN_NAMESPACE + +static Q_LOGGING_CATEGORY(lcAlsaOutput, "qt.multimedia.alsa.output") +//#define DEBUG_AUDIO 1 + +QAlsaAudioSink::QAlsaAudioSink(const QByteArray &device, QObject *parent) + : QPlatformAudioSink(parent) +{ + m_device = device; + + timer = new QTimer(this); + connect(timer, &QTimer::timeout, this, &QAlsaAudioSink::userFeed); +} + +QAlsaAudioSink::~QAlsaAudioSink() +{ + close(); + disconnect(timer, &QTimer::timeout, this, &QAlsaAudioSink::userFeed); + QCoreApplication::processEvents(); + delete timer; +} + +void QAlsaAudioSink::setVolume(qreal vol) +{ + m_volume = vol; +} + +qreal QAlsaAudioSink::volume() const +{ + return m_volume; +} + +QAudio::Error QAlsaAudioSink::error() const +{ + return errorState; +} + +QAudio::State QAlsaAudioSink::state() const +{ + return deviceState; +} + +int QAlsaAudioSink::xrun_recovery(int err) +{ + int count = 0; + bool reset = false; + + // ESTRPIPE is not available in all OSes where ALSA is available + int estrpipe = EIO; +#ifdef ESTRPIPE + estrpipe = ESTRPIPE; +#endif + + if(err == -EPIPE) { + errorState = QAudio::UnderrunError; + emit errorChanged(errorState); + err = snd_pcm_prepare(handle); + if(err < 0) + reset = true; + + } else if ((err == -estrpipe)||(err == -EIO)) { + errorState = QAudio::IOError; + emit errorChanged(errorState); + while((err = snd_pcm_resume(handle)) == -EAGAIN){ + usleep(100); + count++; + if(count > 5) { + reset = true; + break; + } + } + if(err < 0) { + err = snd_pcm_prepare(handle); + if(err < 0) + reset = true; + } + } + if(reset) { + close(); + open(); + snd_pcm_prepare(handle); + return 0; + } + return err; +} + +int QAlsaAudioSink::setFormat() +{ + snd_pcm_format_t pcmformat = SND_PCM_FORMAT_UNKNOWN; + + switch (settings.sampleFormat()) { + case QAudioFormat::UInt8: + pcmformat = SND_PCM_FORMAT_U8; + break; + case QAudioFormat::Int16: + if constexpr (QSysInfo::ByteOrder == QSysInfo::BigEndian) + pcmformat = SND_PCM_FORMAT_S16_BE; + else + pcmformat = SND_PCM_FORMAT_S16_LE; + break; + case QAudioFormat::Int32: + if constexpr (QSysInfo::ByteOrder == QSysInfo::BigEndian) + pcmformat = SND_PCM_FORMAT_S32_BE; + else + pcmformat = SND_PCM_FORMAT_S32_LE; + break; + case QAudioFormat::Float: + if constexpr (QSysInfo::ByteOrder == QSysInfo::BigEndian) + pcmformat = SND_PCM_FORMAT_FLOAT_BE; + else + pcmformat = SND_PCM_FORMAT_FLOAT_LE; + break; + default: + break; + } + + return pcmformat != SND_PCM_FORMAT_UNKNOWN + ? snd_pcm_hw_params_set_format( handle, hwparams, pcmformat) + : -1; +} + +void QAlsaAudioSink::start(QIODevice* device) +{ + if(deviceState != QAudio::StoppedState) + deviceState = QAudio::StoppedState; + + errorState = QAudio::NoError; + + // Handle change of mode + if(audioSource && !pullMode) { + delete audioSource; + audioSource = 0; + } + + close(); + + pullMode = true; + audioSource = device; + + connect(audioSource, &QIODevice::readyRead, timer, [this] { + if (!timer->isActive()) { + timer->start(period_time / 1000); + } + }); + deviceState = QAudio::ActiveState; + + open(); + + emit stateChanged(deviceState); +} + +QIODevice* QAlsaAudioSink::start() +{ + if(deviceState != QAudio::StoppedState) + deviceState = QAudio::StoppedState; + + errorState = QAudio::NoError; + + // Handle change of mode + if(audioSource && !pullMode) { + delete audioSource; + audioSource = 0; + } + + close(); + + audioSource = new AlsaOutputPrivate(this); + audioSource->open(QIODevice::WriteOnly|QIODevice::Unbuffered); + pullMode = false; + + deviceState = QAudio::IdleState; + + open(); + + emit stateChanged(deviceState); + + return audioSource; +} + +void QAlsaAudioSink::stop() +{ + if(deviceState == QAudio::StoppedState) + return; + errorState = QAudio::NoError; + deviceState = QAudio::StoppedState; + close(); + emit stateChanged(deviceState); +} + +bool QAlsaAudioSink::open() +{ + if(opened) + return true; + +#ifdef DEBUG_AUDIO + QTime now(QTime::currentTime()); + qDebug()<<now.second()<<"s "<<now.msec()<<"ms :open()"; +#endif + elapsedTimeOffset = 0; + + int dir; + int err = 0; + int count=0; + unsigned int sampleRate = settings.sampleRate(); + + if (!settings.isValid()) { + qWarning("QAudioSink: open error, invalid format."); + } else if (settings.sampleRate() <= 0) { + qWarning("QAudioSink: open error, invalid sample rate (%d).", + settings.sampleRate()); + } else { + err = -1; + } + + if (err == 0) { + errorState = QAudio::OpenError; + deviceState = QAudio::StoppedState; + emit errorChanged(errorState); + return false; + } + + // Step 1: try and open the device + while((count < 5) && (err < 0)) { + err=snd_pcm_open(&handle, m_device.constData(),SND_PCM_STREAM_PLAYBACK,0); + if(err < 0) + count++; + } + if (( err < 0)||(handle == 0)) { + errorState = QAudio::OpenError; + emit errorChanged(errorState); + deviceState = QAudio::StoppedState; + return false; + } + snd_pcm_nonblock( handle, 0 ); + + // Step 2: Set the desired HW parameters. + snd_pcm_hw_params_alloca( &hwparams ); + + bool fatal = false; + QString errMessage; + unsigned int chunks = 8; + + err = snd_pcm_hw_params_any( handle, hwparams ); + if ( err < 0 ) { + fatal = true; + errMessage = QString::fromLatin1("QAudioSink: snd_pcm_hw_params_any: err = %1").arg(err); + } + if ( !fatal ) { + err = snd_pcm_hw_params_set_rate_resample( handle, hwparams, 1 ); + if ( err < 0 ) { + fatal = true; + errMessage = QString::fromLatin1("QAudioSink: snd_pcm_hw_params_set_rate_resample: err = %1").arg(err); + } + } + if ( !fatal ) { + err = snd_pcm_hw_params_set_access( handle, hwparams, access ); + if ( err < 0 ) { + fatal = true; + errMessage = QString::fromLatin1("QAudioSink: snd_pcm_hw_params_set_access: err = %1").arg(err); + } + } + if ( !fatal ) { + err = setFormat(); + if ( err < 0 ) { + fatal = true; + errMessage = QString::fromLatin1("QAudioSink: snd_pcm_hw_params_set_format: err = %1").arg(err); + } + } + if ( !fatal ) { + err = snd_pcm_hw_params_set_channels( handle, hwparams, (unsigned int)settings.channelCount() ); + if ( err < 0 ) { + fatal = true; + errMessage = QString::fromLatin1("QAudioSink: snd_pcm_hw_params_set_channels: err = %1").arg(err); + } + } + if ( !fatal ) { + err = snd_pcm_hw_params_set_rate_near( handle, hwparams, &sampleRate, 0 ); + if ( err < 0 ) { + fatal = true; + errMessage = QString::fromLatin1("QAudioSink: snd_pcm_hw_params_set_rate_near: err = %1").arg(err); + } + } + if ( !fatal ) { + unsigned int maxBufferTime = 0; + unsigned int minBufferTime = 0; + unsigned int maxPeriodTime = 0; + unsigned int minPeriodTime = 0; + + err = snd_pcm_hw_params_get_buffer_time_max(hwparams, &maxBufferTime, &dir); + if ( err >= 0) + err = snd_pcm_hw_params_get_buffer_time_min(hwparams, &minBufferTime, &dir); + if ( err >= 0) + err = snd_pcm_hw_params_get_period_time_max(hwparams, &maxPeriodTime, &dir); + if ( err >= 0) + err = snd_pcm_hw_params_get_period_time_min(hwparams, &minPeriodTime, &dir); + + if ( err < 0 ) { + fatal = true; + errMessage = QString::fromLatin1("QAudioSink: buffer/period min and max: err = %1").arg(err); + } else { + static unsigned user_buffer_time = qEnvironmentVariableIntValue("QT_ALSA_OUTPUT_BUFFER_TIME"); + static unsigned user_period_time = qEnvironmentVariableIntValue("QT_ALSA_OUTPUT_PERIOD_TIME"); + const bool outOfRange = maxBufferTime < buffer_time || buffer_time < minBufferTime || maxPeriodTime < period_time || minPeriodTime > period_time; + if (outOfRange || user_period_time || user_buffer_time) { + period_time = user_period_time ? user_period_time : minPeriodTime; + if (!user_buffer_time) { + chunks = maxBufferTime / period_time; + buffer_time = period_time * chunks; + } else { + buffer_time = user_buffer_time; + chunks = buffer_time / period_time; + } + } + qCDebug(lcAlsaOutput) << "buffer time: [" << minBufferTime << "-" << maxBufferTime << "] =" << buffer_time; + qCDebug(lcAlsaOutput) << "period time: [" << minPeriodTime << "-" << maxPeriodTime << "] =" << period_time; + qCDebug(lcAlsaOutput) << "chunks =" << chunks; + } + } + if ( !fatal ) { + err = snd_pcm_hw_params_set_buffer_time_near(handle, hwparams, &buffer_time, &dir); + if ( err < 0 ) { + fatal = true; + errMessage = QString::fromLatin1("QAudioSink: snd_pcm_hw_params_set_buffer_time_near: err = %1").arg(err); + } + } + if ( !fatal ) { + err = snd_pcm_hw_params_set_period_time_near(handle, hwparams, &period_time, &dir); + if ( err < 0 ) { + fatal = true; + errMessage = QString::fromLatin1("QAudioSink: snd_pcm_hw_params_set_period_time_near: err = %1").arg(err); + } + } + if ( !fatal ) { + err = snd_pcm_hw_params_set_periods_near(handle, hwparams, &chunks, &dir); + if ( err < 0 ) { + fatal = true; + errMessage = QString::fromLatin1("QAudioSink: snd_pcm_hw_params_set_periods_near: err = %1").arg(err); + } + } + if ( !fatal ) { + err = snd_pcm_hw_params(handle, hwparams); + if ( err < 0 ) { + fatal = true; + errMessage = QString::fromLatin1("QAudioSink: snd_pcm_hw_params: err = %1").arg(err); + } + } + if( err < 0) { + qWarning()<<errMessage; + errorState = QAudio::OpenError; + emit errorChanged(errorState); + deviceState = QAudio::StoppedState; + return false; + } + snd_pcm_hw_params_get_buffer_size(hwparams,&buffer_frames); + buffer_size = snd_pcm_frames_to_bytes(handle,buffer_frames); + snd_pcm_hw_params_get_period_size(hwparams,&period_frames, &dir); + period_size = snd_pcm_frames_to_bytes(handle,period_frames); + snd_pcm_hw_params_get_buffer_time(hwparams,&buffer_time, &dir); + snd_pcm_hw_params_get_period_time(hwparams,&period_time, &dir); + + // Step 3: Set the desired SW parameters. + snd_pcm_sw_params_t *swparams; + snd_pcm_sw_params_alloca(&swparams); + snd_pcm_sw_params_current(handle, swparams); + snd_pcm_sw_params_set_start_threshold(handle,swparams,period_frames); + snd_pcm_sw_params_set_stop_threshold(handle,swparams,buffer_frames); + snd_pcm_sw_params_set_avail_min(handle, swparams,period_frames); + snd_pcm_sw_params(handle, swparams); + + // Step 4: Prepare audio + if(audioBuffer == 0) + audioBuffer = new char[snd_pcm_frames_to_bytes(handle,buffer_frames)]; + snd_pcm_prepare( handle ); + snd_pcm_start(handle); + + // Step 5: Setup timer + bytesAvailable = bytesFree(); + + // Step 6: Start audio processing + timer->start(period_time/1000); + + elapsedTimeOffset = 0; + errorState = QAudio::NoError; + totalTimeValue = 0; + opened = true; + + return true; +} + +void QAlsaAudioSink::close() +{ + timer->stop(); + + if ( handle ) { + snd_pcm_drain( handle ); + snd_pcm_close( handle ); + handle = 0; + delete [] audioBuffer; + audioBuffer=0; + } + if(!pullMode && audioSource) { + delete audioSource; + audioSource = 0; + } + opened = false; +} + +qsizetype QAlsaAudioSink::bytesFree() const +{ + if(resuming) + return period_size; + + if(deviceState != QAudio::ActiveState && deviceState != QAudio::IdleState) + return 0; + + int frames = snd_pcm_avail_update(handle); + if (frames == -EPIPE) { + // Try and handle buffer underrun + int err = snd_pcm_recover(handle, frames, 0); + if (err < 0) + return 0; + else + frames = snd_pcm_avail_update(handle); + } else if (frames < 0) { + return 0; + } + + if ((int)frames > (int)buffer_frames) + frames = buffer_frames; + + return snd_pcm_frames_to_bytes(handle, frames); +} + +qint64 QAlsaAudioSink::write( const char *data, qint64 len ) +{ + // Write out some audio data + if ( !handle ) + return 0; +#ifdef DEBUG_AUDIO + qDebug()<<"frames to write out = "<< + snd_pcm_bytes_to_frames( handle, (int)len )<<" ("<<len<<") bytes"; +#endif + int frames, err; + int space = bytesFree(); + + if (!space) + return 0; + + if (len < space) + space = len; + + frames = snd_pcm_bytes_to_frames(handle, space); + + if (m_volume < 1.0f) { + QVarLengthArray<char, 4096> out(space); + QAudioHelperInternal::qMultiplySamples(m_volume, settings, data, out.data(), space); + err = snd_pcm_writei(handle, out.constData(), frames); + } else { + err = snd_pcm_writei(handle, data, frames); + } + + if(err > 0) { + totalTimeValue += err; + resuming = false; + errorState = QAudio::NoError; + if (deviceState != QAudio::ActiveState) { + deviceState = QAudio::ActiveState; + emit stateChanged(deviceState); + } + return snd_pcm_frames_to_bytes( handle, err ); + } else + err = xrun_recovery(err); + + if(err < 0) { + close(); + errorState = QAudio::FatalError; + emit errorChanged(errorState); + deviceState = QAudio::StoppedState; + emit stateChanged(deviceState); + } + return 0; +} + +void QAlsaAudioSink::setBufferSize(qsizetype value) +{ + if(deviceState == QAudio::StoppedState) + buffer_size = value; +} + +qsizetype QAlsaAudioSink::bufferSize() const +{ + return buffer_size; +} + +qint64 QAlsaAudioSink::processedUSecs() const +{ + return qint64(1000000) * totalTimeValue / settings.sampleRate(); +} + +void QAlsaAudioSink::resume() +{ + if(deviceState == QAudio::SuspendedState) { + int err = 0; + + if(handle) { + err = snd_pcm_prepare( handle ); + if(err < 0) + xrun_recovery(err); + + err = snd_pcm_start(handle); + if(err < 0) + xrun_recovery(err); + + bytesAvailable = (int)snd_pcm_frames_to_bytes(handle, buffer_frames); + } + resuming = true; + + deviceState = suspendedInState; + errorState = QAudio::NoError; + timer->start(period_time/1000); + emit stateChanged(deviceState); + } +} + +void QAlsaAudioSink::setFormat(const QAudioFormat& fmt) +{ + settings = fmt; +} + +QAudioFormat QAlsaAudioSink::format() const +{ + return settings; +} + +void QAlsaAudioSink::suspend() +{ + if(deviceState == QAudio::ActiveState || deviceState == QAudio::IdleState || resuming) { + suspendedInState = deviceState; + snd_pcm_drain(handle); + timer->stop(); + deviceState = QAudio::SuspendedState; + errorState = QAudio::NoError; + emit stateChanged(deviceState); + } +} + +void QAlsaAudioSink::userFeed() +{ + if(deviceState == QAudio::StoppedState || deviceState == QAudio::SuspendedState) + return; +#ifdef DEBUG_AUDIO + QTime now(QTime::currentTime()); + qDebug()<<now.second()<<"s "<<now.msec()<<"ms :userFeed() OUT"; +#endif + if(deviceState == QAudio::IdleState) + bytesAvailable = bytesFree(); + + deviceReady(); +} + +bool QAlsaAudioSink::deviceReady() +{ + if(pullMode) { + int l = 0; + int chunks = bytesAvailable/period_size; + if(chunks==0) { + bytesAvailable = bytesFree(); + return false; + } +#ifdef DEBUG_AUDIO + qDebug()<<"deviceReady() avail="<<bytesAvailable<<" bytes, period size="<<period_size<<" bytes"; + qDebug()<<"deviceReady() no. of chunks that can fit ="<<chunks<<", chunks in bytes ="<<period_size*chunks; +#endif + int input = period_frames*chunks; + if(input > (int)buffer_frames) + input = buffer_frames; + l = audioSource->read(audioBuffer,snd_pcm_frames_to_bytes(handle, input)); + + // reading can take a while and stream may have been stopped + if (!handle) + return false; + + if(l > 0) { + // Got some data to output + if (deviceState != QAudio::ActiveState && deviceState != QAudio::IdleState) + return true; + qint64 bytesWritten = write(audioBuffer,l); + if (bytesWritten != l) + audioSource->seek(audioSource->pos()-(l-bytesWritten)); + bytesAvailable = bytesFree(); + + } else if(l == 0) { + // Did not get any data to output + timer->stop(); + snd_pcm_drain(handle); + bytesAvailable = bytesFree(); + if(bytesAvailable > snd_pcm_frames_to_bytes(handle, buffer_frames-period_frames)) { + // Underrun + if (deviceState != QAudio::IdleState) { + errorState = audioSource->atEnd() ? QAudio::NoError : QAudio::UnderrunError; + emit errorChanged(errorState); + deviceState = QAudio::IdleState; + emit stateChanged(deviceState); + } + } + + } else if(l < 0) { + close(); + deviceState = QAudio::StoppedState; + errorState = QAudio::IOError; + emit errorChanged(errorState); + emit stateChanged(deviceState); + } + } else { + bytesAvailable = bytesFree(); + if(bytesAvailable > snd_pcm_frames_to_bytes(handle, buffer_frames-period_frames)) { + // Underrun + if (deviceState != QAudio::IdleState) { + errorState = QAudio::UnderrunError; + emit errorChanged(errorState); + deviceState = QAudio::IdleState; + emit stateChanged(deviceState); + } + } + } + + if(deviceState != QAudio::ActiveState) + return true; + + return true; +} + +void QAlsaAudioSink::reset() +{ + if(handle) + snd_pcm_reset(handle); + + stop(); +} + +AlsaOutputPrivate::AlsaOutputPrivate(QAlsaAudioSink* audio) +{ + audioDevice = qobject_cast<QAlsaAudioSink*>(audio); +} + +AlsaOutputPrivate::~AlsaOutputPrivate() {} + +qint64 AlsaOutputPrivate::readData( char* data, qint64 len) +{ + Q_UNUSED(data); + Q_UNUSED(len); + + return 0; +} + +qint64 AlsaOutputPrivate::writeData(const char* data, qint64 len) +{ + int retry = 0; + qint64 written = 0; + if((audioDevice->deviceState == QAudio::ActiveState) + ||(audioDevice->deviceState == QAudio::IdleState)) { + while(written < len) { + int chunk = audioDevice->write(data+written,(len-written)); + if(chunk <= 0) + retry++; + written+=chunk; + if(retry > 10) + return written; + } + } + return written; + +} + +QT_END_NAMESPACE + +#include "moc_qalsaaudiosink_p.cpp" |