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     2 **

     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

     4 ** All rights reserved.

     5 ** Contact: Nokia Corporation (qt-info@nokia.com)

     6 **

     7 ** This file is part of the QtMultimedia module of the Qt Toolkit.

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     9 ** $QT_BEGIN_LICENSE:LGPL$

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    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

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    38 ** $QT_END_LICENSE$

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    40 ****************************************************************************/

    41 

    42 //

    43 //  W A R N I N G

    44 //  -------------

    45 //

    46 // This file is not part of the Qt API.  It exists for the convenience

    47 // of other Qt classes.  This header file may change from version to

    48 // version without notice, or even be removed.

    49 //

    50 // We mean it.

    51 //

    52 

    53 #ifndef QAUDIOOUTPUTALSA_H

    54 #define QAUDIOOUTPUTALSA_H

    55 

    56 #include <alsa/asoundlib.h>

    57 

    58 #include <QtCore/qfile.h>

    59 #include <QtCore/qdebug.h>

    60 #include <QtCore/qtimer.h>

    61 #include <QtCore/qstring.h>

    62 #include <QtCore/qstringlist.h>

    63 #include <QtCore/qdatetime.h>

    64 

    65 #include <QtMultimedia/qaudio.h>

    66 #include <QtMultimedia/qaudiodeviceinfo.h>

    67 #include <QtMultimedia/qaudioengine.h>

    68 

    69 QT_BEGIN_NAMESPACE

    70 

    71 class OutputPrivate;

    72 

    73 class QAudioOutputPrivate : public QAbstractAudioOutput

    74 {

    75     friend class OutputPrivate;

    76     Q_OBJECT

    77 public:

    78     QAudioOutputPrivate(const QByteArray &device, const QAudioFormat& audioFormat);

    79     ~QAudioOutputPrivate();

    80 

    81     qint64 write( const char *data, qint64 len );

    82 

    83     QIODevice* start(QIODevice* device = 0);

    84     void stop();

    85     void reset();

    86     void suspend();

    87     void resume();

    88     int bytesFree() const;

    89     int periodSize() const;

    90     void setBufferSize(int value);

    91     int bufferSize() const;

    92     void setNotifyInterval(int milliSeconds);

    93     int notifyInterval() const;

    94     qint64 totalTime() const;

    95     qint64 clock() const;

    96     QAudio::Error error() const;

    97     QAudio::State state() const;

    98     QAudioFormat format() const;

    99 

   100     QIODevice* audioSource;

   101     QAudioFormat settings;

   102     QAudio::Error errorState;

   103     QAudio::State deviceState;

   104 

   105 private slots:

   106     void userFeed();

   107     void feedback();

   108     void updateAvailable();

   109     bool deviceReady();

   110 

   111 signals:

   112     void processMore();

   113 

   114 private:

   115     bool opened;

   116     bool pullMode;

   117     bool resuming;

   118     int buffer_size;

   119     int period_size;

   120     int intervalTime;

   121     qint64 totalTimeValue;

   122     unsigned int buffer_time;

   123     unsigned int period_time;

   124     snd_pcm_uframes_t buffer_frames;

   125     snd_pcm_uframes_t period_frames;

   126     static void async_callback(snd_async_handler_t *ahandler);

   127     int xrun_recovery(int err);

   128 

   129     int setFormat();

   130     bool open();

   131     void close();

   132 

   133     QTimer* timer;

   134     QByteArray m_device;

   135     int bytesAvailable;

   136     QTime timeStamp;

   137     QTime clockStamp;

   138     qint64 elapsedTimeOffset;

   139     char* audioBuffer;

   140     snd_pcm_t* handle;

   141     snd_async_handler_t* ahandler;

   142     snd_pcm_access_t access;

   143     snd_pcm_format_t pcmformat;

   144     snd_timestamp_t* timestamp;

   145     snd_pcm_hw_params_t *hwparams;

   146 };

   147 

   148 class OutputPrivate : public QIODevice

   149 {

   150     friend class QAudioOutputPrivate;

   151     Q_OBJECT

   152 public:

   153     OutputPrivate(QAudioOutputPrivate* audio);

   154     ~OutputPrivate();

   155 

   156     qint64 readData( char* data, qint64 len);

   157     qint64 writeData(const char* data, qint64 len);

   158 

   159 private:

   160     QAudioOutputPrivate *audioDevice;

   161 };

   162 

   163 QT_END_NAMESPACE

   164 

   165 #endif