Changeset 846 for trunk/demos/spectrum/app/engine.h

Timestamp:

May 5, 2011, 5:36:53 AM (14 years ago)

Author:

Dmitry A. Kuminov

Message:

trunk: Merged in qt 4.7.2 sources from branches/vendor/nokia/qt.

Location:

trunk

Files:

• . (modified) (1 prop)
• demos/spectrum/app/engine.h (modified) (13 diffs)

trunk/demos/spectrum/app/engine.h

@@ -1 +1 @@
 /****************************************************************************
 **
-** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
@@ -66 +66 @@
 
 class FrequencySpectrum;
-
 QT_FORWARD_DECLARE_CLASS(QAudioInput)
 QT_FORWARD_DECLARE_CLASS(QAudioOutput)
@@ -93 +92 @@
 
     /**
-     * \return Reference to internal audio buffer
-     * \note This reference is valid for the lifetime of the Engine
-     */
-    const QByteArray& buffer() const    { return m_buffer; }
-
-    /**
      * \return Current audio format
      * \note May be QAudioFormat() if engine is not initialized
@@ -131 +124 @@
     /**
      * Position of the audio input device.
-     * \return Position in microseconds.
+     * \return Position in bytes.
      */
     qint64 recordPosition() const   { return m_recordPosition; }
@@ -149 +142 @@
     /**
      * Position of the audio output device.
-     * \return Position in microseconds.
+     * \return Position in bytes.
      */
     qint64 playPosition() const     { return m_playPosition; }
@@ -155 +148 @@
     /**
      * Length of the internal engine buffer.
-     * \return Buffer length in microseconds.
-     */
-    qint64 bufferDuration() const;
+     * \return Buffer length in bytes.
+     */
+    qint64 bufferLength() const;
 
     /**
      * Amount of data held in the buffer.
-     * \return Data duration in microseconds.
-     */
-    qint64 dataDuration() const;
-
-    /**
-     * Returns the size of the underlying audio buffer in bytes.
-     * This should be an approximation of the capture latency.
-     */
-    qint64 audioBufferLength() const;
+     * \return Data length in bytes.
+     */
+    qint64 dataLength() const       { return m_dataLength; }
 
     /**
@@ -205 +192 @@
      * \param duration Duration in microseconds
      */
-    void bufferDurationChanged(qint64 duration);
+    void bufferLengthChanged(qint64 duration);
 
     /**
      * Amount of data in buffer has changed.
-     * \param duration Duration of data in microseconds
-     */
-    void dataDurationChanged(qint64 duration);
+     * \param Length of data in bytes
+     */
+    void dataLengthChanged(qint64 duration);
 
     /**
      * Position of the audio input device has changed.
-     * \param position Position in microseconds
+     * \param position Position in bytes
      */
     void recordPositionChanged(qint64 position);
@@ -221 +208 @@
     /**
      * Position of the audio output device has changed.
-     * \param position Position in microseconds
+     * \param position Position in bytes
      */
     void playPositionChanged(qint64 position);
@@ -229 +216 @@
      * \param rmsLevel RMS level in range 0.0 - 1.0
      * \param peakLevel Peak level in range 0.0 - 1.0
-     * \param numSamples Number of audio samples analysed
+     * \param numSamples Number of audio samples analyzed
      */
     void levelChanged(qreal rmsLevel, qreal peakLevel, int numSamples);
@@ -235 +222 @@
     /**
      * Spectrum has changed.
-     * \param position Position of start of window in microseconds
-     * \param length   Length of window in microseconds
+     * \param position Position of start of window in bytes
+     * \param length   Length of window in bytes
      * \param spectrum Resulting frequency spectrum
      */
     void spectrumChanged(qint64 position, qint64 length, const FrequencySpectrum &spectrum);
+
+    /**
+     * Buffer containing audio data has changed.
+     * \param position Position of start of buffer in bytes
+     * \param buffer   Buffer
+     */
+    void bufferChanged(qint64 position, qint64 length, const QByteArray &buffer);
 
 private slots:
@@ -248 +242 @@
 
 private:
+    void resetAudioDevices();
     bool initialize();
     bool selectFormat();
@@ -277 +272 @@
     SweptTone           m_tone;
 
-    QFile*              m_file;
-    WavFile             m_wavFile;
+    WavFile*            m_file;
+    // We need a second file handle via which to read data into m_buffer
+    // for analysis
+    WavFile*            m_analysisFile;
 
     QAudioFormat        m_format;
@@ -295 +292 @@
 
     QByteArray          m_buffer;
+    qint64              m_bufferPosition;
+    qint64              m_bufferLength;
     qint64              m_dataLength;
 
+    int                 m_levelBufferLength;
     qreal               m_rmsLevel;
     qreal               m_peakLevel;
 
-    int                 m_spectrumLengthBytes;
+    int                 m_spectrumBufferLength;
     QByteArray          m_spectrumBuffer;
     SpectrumAnalyser    m_spectrumAnalyser;