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Diffstat (limited to 'src/multimedia/audio/qaudioinput.cpp')
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diff --git a/src/multimedia/audio/qaudioinput.cpp b/src/multimedia/audio/qaudioinput.cpp new file mode 100644 index 0000000..3676f64 --- /dev/null +++ b/src/multimedia/audio/qaudioinput.cpp @@ -0,0 +1,432 @@ +/**************************************************************************** +** +** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtMultimedia module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** GNU Lesser General Public License Usage +** Alternatively, 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. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + + +#include <QtMultimedia/qaudio.h> +#include <QtMultimedia/qaudiodeviceinfo.h> +#include <QtMultimedia/qaudioengine.h> +#include <QtMultimedia/qaudioinput.h> + +#include "qaudiodevicefactory_p.h" + +QT_BEGIN_NAMESPACE + +/*! + \class QAudioInput + \brief The QAudioInput class provides an interface for receiving audio data from an audio input device. + + \inmodule QtMultimedia + \ingroup multimedia + \since 4.6 + + You can construct an audio input with the system's + \l{QAudioDeviceInfo::defaultInputDevice()}{default audio input + device}. It is also possible to create QAudioInput with a + specific QAudioDeviceInfo. When you create the audio input, you + should also send in the QAudioFormat to be used for the recording + (see the QAudioFormat class description for details). + + To record to a file: + + QAudioInput lets you record audio with an audio input device. The + default constructor of this class will use the systems default + audio device, but you can also specify a QAudioDeviceInfo for a + specific device. You also need to pass in the QAudioFormat in + which you wish to record. + + Starting up the QAudioInput is simply a matter of calling start() + with a QIODevice opened for writing. For instance, to record to a + file, you can: + + \code + QFile outputFile; // class member. + QAudioInput* audio; // class member. + \endcode + + \code + { + outputFile.setFileName("/tmp/test.raw"); + outputFile.open( QIODevice::WriteOnly | QIODevice::Truncate ); + + QAudioFormat format; + // set up the format you want, eg. + format.setFrequency(8000); + format.setChannels(1); + format.setSampleSize(8); + format.setCodec("audio/pcm"); + format.setByteOrder(QAudioFormat::LittleEndian); + format.setSampleType(QAudioFormat::UnSignedInt); + + QAudioDeviceInfo info = QAudioDeviceInfo::defaultInputDevice(); + if (!info.isFormatSupported(format)) { + qWarning()<<"default format not supported try to use nearest"; + format = info.nearestFormat(format); + } + + audio = new QAudioInput(format, this); + QTimer::singleShot(3000, this, SLOT(stopRecording())); + audio->start(&outputFile); + // Records audio for 3000ms + } + \endcode + + This will start recording if the format specified is supported by + the input device (you can check this with + QAudioDeviceInfo::isFormatSupported(). In case there are any + snags, use the error() function to check what went wrong. We stop + recording in the \c stopRecording() slot. + + \code + void stopRecording() + { + audio->stop(); + outputFile->close(); + delete audio; + } + \endcode + + At any point in time, QAudioInput will be in one of four states: + active, suspended, stopped, or idle. These states are specified by + the QAudio::State enum. You can request a state change directly through + suspend(), resume(), stop(), reset(), and start(). The current + state is reported by state(). QAudioOutput will also signal you + when the state changes (stateChanged()). + + QAudioInput provides several ways of measuring the time that has + passed since the start() of the recording. The \c processedUSecs() + function returns the length of the stream in microseconds written, + i.e., it leaves out the times the audio input was suspended or idle. + The elapsedUSecs() function returns the time elapsed since start() was called regardless of + which states the QAudioInput has been in. + + If an error should occur, you can fetch its reason with error(). + The possible error reasons are described by the QAudio::Error + enum. The QAudioInput will enter the \l{QAudio::}{StoppedState} when + an error is encountered. Connect to the stateChanged() signal to + handle the error: + + \snippet doc/src/snippets/audio/main.cpp 0 + + \sa QAudioOutput, QAudioDeviceInfo + + \section1 Symbian Platform Security Requirements + + On Symbian, processes which use this class must have the + \c UserEnvironment platform security capability. If the client + process lacks this capability, calls to either overload of start() + will fail. + This failure is indicated by the QAudioInput object setting + its error() value to \l{QAudio::OpenError} and then emitting a + \l{stateChanged()}{stateChanged}(\l{QAudio::StoppedState}) signal. + + Platform security capabilities are added via the + \l{qmake-variable-reference.html#target-capability}{TARGET.CAPABILITY} + qmake variable. +*/ + +/*! + Construct a new audio input and attach it to \a parent. + The default audio input device is used with the output + \a format parameters. +*/ + +QAudioInput::QAudioInput(const QAudioFormat &format, QObject *parent): + QObject(parent) +{ + d = QAudioDeviceFactory::createDefaultInputDevice(format); + connect(d, SIGNAL(notify()), SIGNAL(notify())); + connect(d, SIGNAL(stateChanged(QAudio::State)), SIGNAL(stateChanged(QAudio::State))); +} + +/*! + Construct a new audio input and attach it to \a parent. + The device referenced by \a audioDevice is used with the input + \a format parameters. +*/ + +QAudioInput::QAudioInput(const QAudioDeviceInfo &audioDevice, const QAudioFormat &format, QObject *parent): + QObject(parent) +{ + d = QAudioDeviceFactory::createInputDevice(audioDevice, format); + connect(d, SIGNAL(notify()), SIGNAL(notify())); + connect(d, SIGNAL(stateChanged(QAudio::State)), SIGNAL(stateChanged(QAudio::State))); +} + +/*! + Destroy this audio input. +*/ + +QAudioInput::~QAudioInput() +{ + delete d; +} + +/*! + Uses the \a device as the QIODevice to transfer data. + Passing a QIODevice allows the data to be transfered without any extra code. + All that is required is to open the QIODevice. + + If able to successfully get audio data from the systems audio device the + state() is set to either QAudio::ActiveState or QAudio::IdleState, + error() is set to QAudio::NoError and the stateChanged() signal is emitted. + + If a problem occurs during this process the error() is set to QAudio::OpenError, + state() is set to QAudio::StoppedState and stateChanged() signal is emitted. + + \l{QAudioInput#Symbian Platform Security Requirements} + + \sa QIODevice +*/ + +void QAudioInput::start(QIODevice* device) +{ + d->start(device); +} + +/*! + Returns a pointer to the QIODevice being used to handle the data + transfer. This QIODevice can be used to read() audio data + directly. + + If able to access the systems audio device the state() is set to + QAudio::IdleState, error() is set to QAudio::NoError + and the stateChanged() signal is emitted. + + If a problem occurs during this process the error() is set to QAudio::OpenError, + state() is set to QAudio::StoppedState and stateChanged() signal is emitted. + + \l{QAudioInput#Symbian Platform Security Requirements} + + \sa QIODevice +*/ + +QIODevice* QAudioInput::start() +{ + return d->start(0); +} + +/*! + Returns the QAudioFormat being used. +*/ + +QAudioFormat QAudioInput::format() const +{ + return d->format(); +} + +/*! + Stops the audio input, detaching from the system resource. + + Sets error() to QAudio::NoError, state() to QAudio::StoppedState and + emit stateChanged() signal. +*/ + +void QAudioInput::stop() +{ + d->stop(); +} + +/*! + Drops all audio data in the buffers, resets buffers to zero. +*/ + +void QAudioInput::reset() +{ + d->reset(); +} + +/*! + Stops processing audio data, preserving buffered audio data. + + Sets error() to QAudio::NoError, state() to QAudio::SuspendedState and + emit stateChanged() signal. +*/ + +void QAudioInput::suspend() +{ + d->suspend(); +} + +/*! + Resumes processing audio data after a suspend(). + + Sets error() to QAudio::NoError. + Sets state() to QAudio::ActiveState if you previously called start(QIODevice*). + Sets state() to QAudio::IdleState if you previously called start(). + emits stateChanged() signal. +*/ + +void QAudioInput::resume() +{ + d->resume(); +} + +/*! + Sets the audio buffer size to \a value milliseconds. + + Note: This function can be called anytime before start(), calls to this + are ignored after start(). It should not be assumed that the buffer size + set is the actual buffer size used, calling bufferSize() anytime after start() + will return the actual buffer size being used. + +*/ + +void QAudioInput::setBufferSize(int value) +{ + d->setBufferSize(value); +} + +/*! + Returns the audio buffer size in milliseconds. + + If called before start(), returns platform default value. + If called before start() but setBufferSize() was called prior, returns value set by setBufferSize(). + If called after start(), returns the actual buffer size being used. This may not be what was set previously + by setBufferSize(). + +*/ + +int QAudioInput::bufferSize() const +{ + return d->bufferSize(); +} + +/*! + Returns the amount of audio data available to read in bytes. + + NOTE: returned value is only valid while in QAudio::ActiveState or QAudio::IdleState + state, otherwise returns zero. +*/ + +int QAudioInput::bytesReady() const +{ + /* + -If not ActiveState|IdleState, return 0 + -return amount of audio data available to read + */ + return d->bytesReady(); +} + +/*! + Returns the period size in bytes. + + Note: This is the recommended read size in bytes. +*/ + +int QAudioInput::periodSize() const +{ + return d->periodSize(); +} + +/*! + Sets the interval for notify() signal to be emitted. + This is based on the \a ms of audio data processed + not on actual real-time. + The minimum resolution of the timer is platform specific and values + should be checked with notifyInterval() to confirm actual value + being used. +*/ + +void QAudioInput::setNotifyInterval(int ms) +{ + d->setNotifyInterval(ms); +} + +/*! + Returns the notify interval in milliseconds. +*/ + +int QAudioInput::notifyInterval() const +{ + return d->notifyInterval(); +} + +/*! + Returns the amount of audio data processed since start() + was called in microseconds. +*/ + +qint64 QAudioInput::processedUSecs() const +{ + return d->processedUSecs(); +} + +/*! + Returns the microseconds since start() was called, including time in Idle and + Suspend states. +*/ + +qint64 QAudioInput::elapsedUSecs() const +{ + return d->elapsedUSecs(); +} + +/*! + Returns the error state. +*/ + +QAudio::Error QAudioInput::error() const +{ + return d->error(); +} + +/*! + Returns the state of audio processing. +*/ + +QAudio::State QAudioInput::state() const +{ + return d->state(); +} + +/*! + \fn QAudioInput::stateChanged(QAudio::State state) + This signal is emitted when the device \a state has changed. +*/ + +/*! + \fn QAudioInput::notify() + This signal is emitted when x ms of audio data has been processed + the interval set by setNotifyInterval(x). +*/ + +QT_END_NAMESPACE + |