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    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 "qaudio.h"

    66 #include "qaudiodeviceinfo.h"

    67 #include "qaudiosystem.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);

    79     ~QAudioOutputPrivate();

    80 

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

    82 

    83     void start(QIODevice* device);

    84     QIODevice* start();

    85     void stop();

    86     void reset();

    87     void suspend();

    88     void resume();

    89     int bytesFree() const;

    90     int periodSize() const;

    91     void setBufferSize(int value);

    92     int bufferSize() const;

    93     void setNotifyInterval(int milliSeconds);

    94     int notifyInterval() const;

    95     qint64 processedUSecs() const;

    96     qint64 elapsedUSecs() const;

    97     QAudio::Error error() const;

    98     QAudio::State state() const;

    99     void setFormat(const QAudioFormat& fmt);

   100     QAudioFormat format() const;

   101 

   102     QIODevice* audioSource;

   103     QAudioFormat settings;

   104     QAudio::Error errorState;

   105     QAudio::State deviceState;

   106 

   107 private slots:

   108     void userFeed();

   109     void feedback();

   110     void updateAvailable();

   111     bool deviceReady();

   112 

   113 signals:

   114     void processMore();

   115 

   116 private:

   117     bool opened;

   118     bool pullMode;

   119     bool resuming;

   120     int buffer_size;

   121     int period_size;

   122     int intervalTime;

   123     qint64 totalTimeValue;

   124     unsigned int buffer_time;

   125     unsigned int period_time;

   126     snd_pcm_uframes_t buffer_frames;

   127     snd_pcm_uframes_t period_frames;

   128     static void async_callback(snd_async_handler_t *ahandler);

   129     int xrun_recovery(int err);

   130 

   131     int setFormat();

   132     bool open();

   133     void close();

   134 

   135     QTimer* timer;

   136     QByteArray m_device;

   137     int bytesAvailable;

   138     QTime timeStamp;

   139     QTime clockStamp;

   140     qint64 elapsedTimeOffset;

   141     char* audioBuffer;

   142     snd_pcm_t* handle;

   143     snd_async_handler_t* ahandler;

   144     snd_pcm_access_t access;

   145     snd_pcm_format_t pcmformat;

   146     snd_timestamp_t* timestamp;

   147     snd_pcm_hw_params_t *hwparams;

   148 };

   149 

   150 class OutputPrivate : public QIODevice

   151 {

   152     friend class QAudioOutputPrivate;

   153     Q_OBJECT

   154 public:

   155     OutputPrivate(QAudioOutputPrivate* audio);

   156     ~OutputPrivate();

   157 

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

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

   160 

   161 private:

   162     QAudioOutputPrivate *audioDevice;

   163 };

   164 

   165 QT_END_NAMESPACE

   166 

   167 #endif