diff options
author | Michael Goddard <michael.goddard@nokia.com> | 2012-04-10 21:33:00 +1000 |
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committer | Qt by Nokia <qt-info@nokia.com> | 2012-04-11 03:32:00 +0200 |
commit | e057fd9e8a68aa7ab5cbe3cfd8d6f9f787107dcd (patch) | |
tree | c2a30e599652a3195b77841ba241157e45701941 /src/multimedia/audio/qaudiodecoder.cpp | |
parent | 8484b0ff9c40fe70cdfc17bf74b0a5be93d674de (diff) |
Move QAudioDecoder to public.
To get better feedback between alpha & beta.
Change-Id: I3620825fb9c2bb9de69951cf1d583b191d62cb0d
Reviewed-by: Jonas Rabbe <jonas.rabbe@nokia.com>
Diffstat (limited to 'src/multimedia/audio/qaudiodecoder.cpp')
-rw-r--r-- | src/multimedia/audio/qaudiodecoder.cpp | 547 |
1 files changed, 547 insertions, 0 deletions
diff --git a/src/multimedia/audio/qaudiodecoder.cpp b/src/multimedia/audio/qaudiodecoder.cpp new file mode 100644 index 000000000..1253deb8c --- /dev/null +++ b/src/multimedia/audio/qaudiodecoder.cpp @@ -0,0 +1,547 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** This file is part of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** This file may be used under the terms of the GNU Lesser General Public +** License version 2.1 as published by the Free Software Foundation and +** appearing in the file LICENSE.LGPL included in the packaging of this +** file. Please review the following information to ensure the GNU Lesser +** General Public License version 2.1 requirements will be met: +** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU General +** Public License version 3.0 as published by the Free Software Foundation +** and appearing in the file LICENSE.GPL included in the packaging of this +** file. Please review the following information to ensure the GNU General +** Public License version 3.0 requirements will be met: +** http://www.gnu.org/copyleft/gpl.html. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qaudiodecoder.h" + +#include "qmediaobject_p.h" +#include <qmediaservice.h> +#include "qaudiodecodercontrol.h" +#include <private/qmediaserviceprovider_p.h> + +#include <QtCore/qcoreevent.h> +#include <QtCore/qmetaobject.h> +#include <QtCore/qtimer.h> +#include <QtCore/qdebug.h> +#include <QtCore/qpointer.h> + +QT_BEGIN_NAMESPACE + +/*! + \class QAudioDecoder + \brief The QAudioDecoder class allows decoding audio. + \inmodule QtMultimedia + \ingroup multimedia + \ingroup multimedia_audio + + \preliminary + + The QAudioDecoder class is a high level class for decoding local + audio media files. It is similar to the QMediaPlayer class except + that audio is provided back through this API rather than routed + directly to audio hardware, and playlists and network and streaming + based media is not supported. + + \sa QAudioBuffer +*/ + +namespace +{ +class AudioDecoderRegisterMetaTypes +{ +public: + AudioDecoderRegisterMetaTypes() + { + qRegisterMetaType<QAudioDecoder::State>("QAudioDecoder::State"); + qRegisterMetaType<QAudioDecoder::Error>("QAudioDecoder::Error"); + } +} _registerPlayerMetaTypes; +} + +class QAudioDecoderPrivate : public QMediaObjectPrivate +{ + Q_DECLARE_NON_CONST_PUBLIC(QAudioDecoder) + +public: + QAudioDecoderPrivate() + : provider(0) + , control(0) + , state(QAudioDecoder::StoppedState) + , error(QAudioDecoder::NoError) + {} + + QMediaServiceProvider *provider; + QAudioDecoderControl *control; + QAudioDecoder::State state; + QAudioDecoder::Error error; + QString errorString; + + void _q_stateChanged(QAudioDecoder::State state); + void _q_error(int error, const QString &errorString); +}; + +void QAudioDecoderPrivate::_q_stateChanged(QAudioDecoder::State ps) +{ + Q_Q(QAudioDecoder); + + if (ps != state) { + state = ps; + + emit q->stateChanged(ps); + } +} + +void QAudioDecoderPrivate::_q_error(int error, const QString &errorString) +{ + Q_Q(QAudioDecoder); + + this->error = QAudioDecoder::Error(error); + this->errorString = errorString; + + emit q->error(this->error); +} + +/*! + Construct an QAudioDecoder instance + parented to \a parent. +*/ +QAudioDecoder::QAudioDecoder(QObject *parent) + : QMediaObject(*new QAudioDecoderPrivate, + parent, + QMediaServiceProvider::defaultServiceProvider()->requestService(Q_MEDIASERVICE_AUDIODECODER)) +{ + Q_D(QAudioDecoder); + + d->provider = QMediaServiceProvider::defaultServiceProvider(); + if (d->service == 0) { + d->error = ServiceMissingError; + } else { + d->control = qobject_cast<QAudioDecoderControl*>(d->service->requestControl(QAudioDecoderControl_iid)); + if (d->control != 0) { + connect(d->control, SIGNAL(stateChanged(QAudioDecoder::State)), SLOT(_q_stateChanged(QAudioDecoder::State))); + connect(d->control, SIGNAL(error(int,QString)), SLOT(_q_error(int,QString))); + + connect(d->control, SIGNAL(formatChanged(QAudioFormat)), SIGNAL(formatChanged(QAudioFormat))); + connect(d->control, SIGNAL(sourceChanged()), SIGNAL(sourceChanged())); + connect(d->control, SIGNAL(bufferReady()), this, SIGNAL(bufferReady())); + connect(d->control ,SIGNAL(bufferAvailableChanged(bool)), this, SIGNAL(bufferAvailableChanged(bool))); + connect(d->control ,SIGNAL(finished()), this, SIGNAL(finished())); + connect(d->control ,SIGNAL(positionChanged(qint64)), this, SIGNAL(positionChanged(qint64))); + connect(d->control ,SIGNAL(durationChanged(qint64)), this, SIGNAL(durationChanged(qint64))); + } + } +} + + +/*! + Destroys the audio decoder object. +*/ +QAudioDecoder::~QAudioDecoder() +{ + Q_D(QAudioDecoder); + + if (d->service) { + if (d->control) + d->service->releaseControl(d->control); + + d->provider->releaseService(d->service); + } +} + +QAudioDecoder::State QAudioDecoder::state() const +{ + return d_func()->state; +} + +/*! + Returns the current error state. +*/ + +QAudioDecoder::Error QAudioDecoder::error() const +{ + return d_func()->error; +} + +QString QAudioDecoder::errorString() const +{ + return d_func()->errorString; +} + +/*! + Starts decoding the audio resource. + + As data gets decoded, the \l bufferReady() signal will be emitted + when enough data has been decoded. Calling \l read() will then return + an audio buffer without blocking. + + Alternatively, if you wish to block until enough data has been decoded, + you can call read() at any time to block until a buffer is ready. + + \sa read() +*/ +void QAudioDecoder::start() +{ + Q_D(QAudioDecoder); + + if (d->control == 0) { + QMetaObject::invokeMethod(this, "_q_error", Qt::QueuedConnection, + Q_ARG(int, QAudioDecoder::ServiceMissingError), + Q_ARG(QString, tr("The QAudioDecoder object does not have a valid service"))); + return; + } + + // Reset error conditions + d->error = NoError; + d->errorString.clear(); + + d->control->start(); +} + +/*! + Stop decoding audio. Calling \l start() again will resume decoding from the beginning. +*/ +void QAudioDecoder::stop() +{ + Q_D(QAudioDecoder); + + if (d->control != 0) + d->control->stop(); +} + +/*! + Returns the current file name to decode. + If \l setSourceDevice was called, this will + be empty. +*/ +QString QAudioDecoder::sourceFilename() const +{ + Q_D(const QAudioDecoder); + if (d->control) + return d->control->sourceFilename(); + return QString(); +} + +/*! + Sets the current audio file name to \a fileName. + + When this property is set any current decoding is stopped, + and any audio buffers are discarded. + + You can only specify either a source filename or + a source QIODevice. Setting one will unset the other. +*/ +void QAudioDecoder::setSourceFilename(const QString &fileName) +{ + Q_D(QAudioDecoder); + + if (d->control != 0) + d_func()->control->setSourceFilename(fileName); +} + +/*! + Returns the current source QIODevice, if one was set. + If \l setSourceFilename() was called, this will be 0. +*/ +QIODevice *QAudioDecoder::sourceDevice() const +{ + Q_D(const QAudioDecoder); + if (d->control) + return d->control->sourceDevice(); + return 0; +} + +/*! + Sets the current audio QIODevice to \a device. + + When this property is set any current decoding is stopped, + and any audio buffers are discarded. + + You can only specify either a source filename or + a source QIODevice. Setting one will unset the other. +*/ +void QAudioDecoder::setSourceDevice(QIODevice *device) +{ + Q_D(QAudioDecoder); + + if (d->control != 0) + d_func()->control->setSourceDevice(device); +} + +/*! + Returns the current audio format of the decoded stream. + + Any buffers returned should have this format. + + \sa setAudioFormat(), formatChanged() +*/ +QAudioFormat QAudioDecoder::audioFormat() const +{ + Q_D(const QAudioDecoder); + if (d->control) + return d->control->audioFormat(); + return QAudioFormat(); +} + +/*! + Set the desired audio format for decoded samples to \a format. + + This property can only be set while the decoder is stopped. + Setting this property at other times will be ignored. + + If the decoder does not support this format, \l error() will + be set to \c FormatError. + + If you do not specify a format, the format of the decoded + audio itself will be used. Otherwise, some format conversion + will be applied. + + If you wish to reset the decoded format to that of the original + audio file, you can specify an invalid \a format. +*/ +void QAudioDecoder::setAudioFormat(const QAudioFormat &format) +{ + Q_D(QAudioDecoder); + + if (state() != QAudioDecoder::StoppedState) + return; + + if (d->control != 0) + d_func()->control->setAudioFormat(format); +} + +/*! + \internal +*/ + +bool QAudioDecoder::bind(QObject *obj) +{ + return QMediaObject::bind(obj); +} + +/*! + \internal +*/ + +void QAudioDecoder::unbind(QObject *obj) +{ + QMediaObject::unbind(obj); +} + +/*! + Returns the level of support an audio decoder has for a \a mimeType and a set of \a codecs. +*/ +QtMultimedia::SupportEstimate QAudioDecoder::hasSupport(const QString &mimeType, + const QStringList& codecs) +{ + return QMediaServiceProvider::defaultServiceProvider()->hasSupport(QByteArray(Q_MEDIASERVICE_AUDIODECODER), + mimeType, + codecs); +} + +/*! + \fn QAudioDecoder::bufferAvailable() const + + Returns true if a buffer is available to be read, + and false otherwise. If there is no buffer available, calling + the \l read() function may block until a buffer is available or + the end of the media is reached +*/ +bool QAudioDecoder::bufferAvailable() const +{ + Q_D(const QAudioDecoder); + if (d->control) + return d->control->bufferAvailable(); + return false; +} + +/*! + Returns position (in milliseconds) of the last buffer read from + the decoder or -1 if no buffers have been read. +*/ + +qint64 QAudioDecoder::position() const +{ + Q_D(const QAudioDecoder); + if (d->control) + return d->control->position(); + return -1; +} + +/*! + Returns total duration (in milliseconds) of the audio stream or -1 + if not available. +*/ + +qint64 QAudioDecoder::duration() const +{ + Q_D(const QAudioDecoder); + if (d->control) + return d->control->duration(); + return -1; +} + +/*! + Read a buffer from the decoder. Returns invalid buffer on failure. +*/ + +QAudioBuffer QAudioDecoder::read() const +{ + Q_D(const QAudioDecoder); + + if (d->control) { + return d->control->read(); + } else { + return QAudioBuffer(); + } +} + +// Enums +/*! + \enum QAudioDecoder::State + + Defines the current state of a media player. + + \value DecodingState The audio player is currently decoding media. + \value StoppedState The decoder is not decoding. Decoding will + start at the start of the media. +*/ + +/*! + \enum QAudioDecoder::Error + + Defines a media player error condition. + + \value NoError No error has occurred. + \value ResourceError A media resource couldn't be resolved. + \value FormatError The format of a media resource isn't supported. + \value AccessDeniedError There are not the appropriate permissions to play a media resource. + \value ServiceMissingError A valid playback service was not found, playback cannot proceed. +*/ + +// Signals +/*! + \fn QAudioDecoder::error(QAudioDecoder::Error error) + + Signals that an \a error condition has occurred. + + \sa errorString() +*/ + +/*! + \fn void QAudioDecoder::stateChanged(State state) + + Signal the \a state of the decoder object has changed. +*/ + +/*! + \fn void QAudioDecoder::sourceChanged() + + Signals that the current source of the decoder has changed. + + \sa sourceFilename(), sourceDevice() +*/ + +/*! + \fn void QAudioDecoder::formatChanged(const QAudioFormat &format) + + Signals that the current audio format of the decoder has changed to \a format. + + \sa audioFormat(), setAudioFormat() +*/ + +/*! + \fn void QAudioDecoder::bufferReady() + + Signals that a new decoded audio buffer is available to be read. + + \sa read(), bufferAvailable() +*/ + +/*! + \fn void QAudioDecoder::bufferAvailableChanged(bool available) + + Signals the availability (if \a available is true) of a new buffer. + + If \a available is false, there are no buffers available. + + \sa bufferAvailable(), bufferReady() +*/ + +/*! + \fn void QAudioDecoder::finished() + + Signals that the decoding has finished successfully. + If decoding fails, error signal is emitted instead. + + \sa start(), stop(), error() +*/ + +/*! + \fn void QAudioDecoder::positionChanged(qint64 position) + + Signals that the current \a position of the decoder has changed. + + \sa durationChanged() +*/ + +/*! + \fn void QAudioDecoder::durationChanged(qint64 duration) + + Signals that the estimated \a duration of the decoded data has changed. + + \sa positionChanged() +*/ + + +// Properties +/*! + \property QAudioDecoder::state + \brief the audio decoder's playback state. + + By default this property is QAudioDecoder::Stopped + + \sa start(), stop() +*/ + +/*! + \property QAudioDecoder::error + \brief a string describing the last error condition. + + \sa error() +*/ + +/*! + \property QAudioDecoder::sourceFilename + \brief the active filename being decoded by the decoder object. +*/ + +#include "moc_qaudiodecoder.cpp" +QT_END_NAMESPACE + |