sound.cpp

Trolltech公司发布的图形界面操作系统。可在qt-embedded-2.3.7平台上编译为嵌入式图形界面操作系统。

/**********************************************************************
** Copyright (C) 2000-2002 Trolltech AS.  All rights reserved.
**
** This file is part of the Qtopia Environment.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact [e-mail] if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/

#include <qtopia/resource.h>
#include <qtopia/sound.h>
#ifdef QWS
#include <qtopia/qcopenvelope_qws.h>
#endif

#include <qsound.h>
#include <qfile.h>

#ifndef QT_NO_SOUND
static int WAVsoundDuration(const QString& filename)
{
    // bad solution

    // most of this is copied from qsoundqss.cpp

    QFile input(filename);
    if ( !input.open(IO_ReadOnly) )
	return 0;

    struct QRiffChunk {
	char id[4];
	Q_UINT32 size;
	char data[4/*size*/];
    } chunk;

    struct {
        Q_INT16 formatTag;
        Q_INT16 channels;
        Q_INT32 samplesPerSec;
        Q_INT32 avgBytesPerSec;
        Q_INT16 blockAlign;
        Q_INT16 wBitsPerSample;
    } chunkdata;

    int total = 0;

    while(1) {
	// Keep reading chunks...
	const int n = sizeof(chunk)-sizeof(chunk.data);
	if ( input.readBlock((char*)&chunk,n) != n )
	    break;
	if ( qstrncmp(chunk.id,"data",4) == 0 ) { // No tr
	    total += chunkdata.avgBytesPerSec ?
		chunk.size * 1000 / chunkdata.avgBytesPerSec : 0;
//qDebug("%d bytes of PCM (%dms)", chunk.size,chunkdata.avgBytesPerSec ?  chunk.size * 1000 / chunkdata.avgBytesPerSec : 0);
	    input.at(input.at()+chunk.size-4);
	} else if ( qstrncmp(chunk.id,"RIFF",4) == 0 ) {
	    char d[4];
	    if ( input.readBlock(d,4) != 4 )
		return 0;
	    if ( qstrncmp(d,"WAVE",4) != 0 ) {
		// skip
//qDebug("skip %.4s RIFF chunk",d);
		if ( chunk.size < 10000000 )
		    (void)input.at(input.at()+chunk.size-4);
	    }
	} else if ( qstrncmp(chunk.id,"fmt ",4) == 0 ) {
	    if ( input.readBlock((char*)&chunkdata,sizeof(chunkdata)) != sizeof(chunkdata) )
		return 0;
#define WAVE_FORMAT_PCM 1
	    if ( chunkdata.formatTag != WAVE_FORMAT_PCM ) {
		//qDebug("WAV file: UNSUPPORTED FORMAT %d",chunkdata.formatTag);
		return 0;
	    }
	} else {
//qDebug("skip %.4s chunk",chunk.id);
	    // ignored chunk
	    if ( chunk.size < 10000000 )
		(void)input.at(input.at()+chunk.size);
	}
    }

//qDebug("%dms",total);
    return total;
}

class SoundData : public QSound {
public:
    SoundData(const QString& name) :
	QSound(Resource::findSound(name)),
	filename(Resource::findSound(name))
    {
    }

    void playLoop()
    {
	// needs server support

	int ms = WAVsoundDuration(filename);
	if ( ms )
	    startTimer(ms > 50 ? ms-50 : 0); // 50 for latency
	play();
    }

    void timerEvent(QTimerEvent*)
    {
	play();
    }

private:
    QString filename;
};
#endif

/*! Opens a wave sound file \a name for playing */
Sound::Sound(const QString& name)
{
#ifndef QT_NO_SOUND
    d = new SoundData(name);
#endif
}

/*! Destroys the sound */
Sound::~Sound()
{
#ifndef QT_NO_SOUND
    delete d;
#endif
}

/*! Play the sound once */
void Sound::play()
{
#ifndef QT_NO_SOUND
    d->killTimers();
    d->play();
#endif
}

/*! Play the sound, repeatedly until stop() is called */
void Sound::playLoop()
{
#ifndef QT_NO_SOUND
    d->killTimers();
    d->playLoop();
#endif
}

/*! Do not repeat the sound after it finishes. This will end a playLoop() */
void Sound::stop()
{
#ifndef QT_NO_SOUND
    d->killTimers();
#endif
}

/*! Sounds the audible system alarm. This is used for applications such
  as Calendar when it needs to alarm the user of an event.
*/
void Sound::soundAlarm()
{
#ifdef QT_QWS_CUSTOM
# ifndef QT_NO_COP
    QCopEnvelope( "QPE/TaskBar", "soundAlarm()" );
# endif
#else
# ifndef QT_NO_SOUND
    QSound::play(Resource::findSound("alarm")); // No tr
# endif
#endif
}

/*! \class Sound
  \brief The Sound class plays WAVE sound files and can invoke the audible alarm.

  The Sound class is constructed with the .wav music file name. The Sound
  class retrieves the sound file from the shared Resource class. This class
  ties together QSound and the available sound resources.

  To sound an audible system alarm, call the static method soundAlarm()

  \ingroup qtopiaemb
*/