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    41 

    42 #ifndef SYMBIANAUDIOUTILS_H

    43 #define SYMBIANAUDIOUTILS_H

    44 

    45 #include <QtCore/qnamespace.h>

    46 #include <QtMultimedia/qaudioformat.h>

    47 #include <QtMultimedia/qaudio.h>

    48 #include <sounddevice.h>

    49 #include "symbianaudio.h"

    50 

    51 QT_BEGIN_NAMESPACE

    52 

    53 namespace SymbianAudio {

    54 

    55 /*

    56  * Helper class for querying DevSound codec / format support

    57  */

    58 class DevSoundCapabilities {

    59 public:

    60     DevSoundCapabilities(CMMFDevSound &devsound, QAudio::Mode mode);

    61     ~DevSoundCapabilities();

    62 

    63     const RArray<TFourCC>& fourCC() const   { return m_fourCC; }

    64     const TMMFCapabilities& caps() const    { return m_caps; }

    65 

    66 private:

    67     void constructL(CMMFDevSound &devsound, QAudio::Mode mode);

    68 

    69 private:

    70     RArray<TFourCC> m_fourCC;

    71     TMMFCapabilities m_caps;

    72 };

    73 

    74 namespace Utils {

    75 

    76 /**

    77  * Convert native audio capabilities to QAudio lists.

    78  */

    79 void capabilitiesNativeToQt(const DevSoundCapabilities &caps,

    80                             QList<int> &frequencies,

    81                             QList<int> &channels,

    82                             QList<int> &sampleSizes,

    83                             QList<QAudioFormat::Endian> &byteOrders,

    84                             QList<QAudioFormat::SampleType> &sampleTypes);

    85 

    86 /**

    87  * Check whether format is supported.

    88  */

    89 bool isFormatSupported(const QAudioFormat &format,

    90                        const DevSoundCapabilities &caps);

    91 

    92 /**

    93  * Convert QAudioFormat to native format types.

    94  *

    95  * Note that, despite the name, DevSound uses TMMFCapabilities to specify

    96  * single formats as well as capabilities.

    97  *

    98  * Note that this function does not modify outputFormat.iBufferSize.

    99  */

   100 bool formatQtToNative(const QAudioFormat &inputFormat,

   101                       TUint32 &outputFourCC,

   102                       TMMFCapabilities &outputFormat);

   103 

   104 /**

   105  * Convert internal states to QAudio states.

   106  */

   107 QAudio::State stateNativeToQt(State nativeState,

   108                               QAudio::State initializingState);

   109 

   110 /**

   111  * Convert data length to number of samples.

   112  */

   113 qint64 bytesToSamples(const QAudioFormat &format, qint64 length);

   114 

   115 /**

   116  * Convert number of samples to data length.

   117  */

   118 qint64 samplesToBytes(const QAudioFormat &format, qint64 samples);

   119 

   120 } // namespace Utils

   121 } // namespace SymbianAudio

   122 

   123 QT_END_NAMESPACE

   124 

   125 #endif