[QSoundBuffer] Replace isReady() with state() states

The two-state "isReady" is not enough for checking if loading was
already requested.
This also makes it abvious we're accepting load() after error.

Change-Id: I8181f99e8b36be484ec791862941b5b2ec78eb1f
Reviewed-by: Yoann Lopes <yoann.lopes@theqtcompany.com>

src/imports/audioengine/qaudioengine_openal_p.cpp

@@ -58,7 +58,7 @@ StaticSoundBufferAL::StaticSoundBufferAL(QObject *parent, const QUrl &url, QSamp
       m_ref(1),
       m_url(url),
       m_alBuffer(0),
-      m_isReady(false),
+      m_state(Creating),
       m_sample(0),
       m_sampleLoader(sampleLoader)
 {
@@ -79,10 +79,19 @@ StaticSoundBufferAL::~StaticSoundBufferAL()
     }
 }
 
+QSoundBuffer::State StaticSoundBufferAL::state() const
+{
+    return m_state;
+}
+
 void StaticSoundBufferAL::load()
 {
-    if (m_sample)
+    if (m_state == Loading || m_state == Ready)
         return;
+
+    m_state = Loading;
+    emit stateChanged(m_state);
+
     m_sample = m_sampleLoader->requestSample(m_url);
     connect(m_sample, SIGNAL(error()), this, SLOT(decoderError()));
     connect(m_sample, SIGNAL(ready()), this, SLOT(sampleReady()));
@@ -98,11 +107,6 @@ void StaticSoundBufferAL::load()
     }
 }
 
-bool StaticSoundBufferAL::isReady() const
-{
-    return m_isReady;
-}
-
 void StaticSoundBufferAL::bindToSource(ALuint alSource)
 {
     Q_ASSERT(m_alBuffer != 0);
@@ -162,7 +166,8 @@ void StaticSoundBufferAL::sampleReady()
     m_sample->release();
     m_sample = 0;
 
-    m_isReady = true;
+    m_state = Ready;
+    emit stateChanged(m_state);
     emit ready();
 }
 
@@ -176,6 +181,8 @@ void StaticSoundBufferAL::decoderError()
     m_sample->release();
     m_sample = 0;
 
+    m_state = Error;
+    emit stateChanged(m_state);
     emit error();
 }
 

src/imports/audioengine/qaudioengine_openal_p.h

@@ -74,8 +74,9 @@ public:
     StaticSoundBufferAL(QObject *parent, const QUrl &url, QSampleCache *sampleLoader);
     ~StaticSoundBufferAL();
 
+    State state() const Q_DECL_OVERRIDE;
+
     void load() Q_DECL_OVERRIDE;
-    bool isReady() const Q_DECL_OVERRIDE;
 
     void bindToSource(ALuint alSource) Q_DECL_OVERRIDE;
     void unbindFromSource(ALuint alSource) Q_DECL_OVERRIDE;
@@ -92,7 +93,7 @@ private:
     long m_ref;
     QUrl m_url;
     ALuint m_alBuffer;
-    bool m_isReady;
+    State m_state;
     QSample *m_sample;
     QSampleCache *m_sampleLoader;
 };

src/imports/audioengine/qdeclarative_audiosample_p.cpp

@@ -153,7 +153,7 @@ bool QDeclarativeAudioSample::isLoaded() const
 {
     if (!m_soundBuffer)
         return false;
-    return m_soundBuffer->isReady();
+    return m_soundBuffer->state() == QSoundBuffer::Ready;
 }
 
 /*!
@@ -163,13 +163,12 @@ bool QDeclarativeAudioSample::isLoaded() const
 */
 void QDeclarativeAudioSample::load()
 {
-    if (isLoaded())
-        return;
     if (!m_soundBuffer) {
         m_preloaded = true;
         return;
     }
-    m_soundBuffer->load();
+    if (m_soundBuffer->state() != QSoundBuffer::Loading && m_soundBuffer->state() != QSoundBuffer::Ready)
+        m_soundBuffer->load();
 }
 
 void QDeclarativeAudioSample::setPreloaded(bool preloaded)
@@ -218,7 +217,7 @@ void QDeclarativeAudioSample::init()
     } else {
         m_soundBuffer =
             qobject_cast<QDeclarativeAudioEngine*>(parent())->engine()->getStaticSoundBuffer(m_url);
-        if (m_soundBuffer->isReady()) {
+        if (m_soundBuffer->state() == QSoundBuffer::Ready) {
             emit loadedChanged();
         } else {
             connect(m_soundBuffer, SIGNAL(ready()), this, SIGNAL(loadedChanged()));

src/imports/audioengine/qsoundbuffer_p.h

@@ -41,11 +41,22 @@ QT_BEGIN_NAMESPACE
 class QSoundBuffer : public QObject
 {
     Q_OBJECT
+
 public:
-    virtual bool isReady() const = 0;
+    enum State
+    {
+        Creating,
+        Loading,
+        Error,
+        Ready
+    };
+
+    virtual State state() const = 0;
+
     virtual void load() = 0;
 
 Q_SIGNALS:
+    void stateChanged(State state);
     void ready();
     void error();
 

src/imports/audioengine/qsoundinstance_p.cpp

@@ -144,7 +144,7 @@ void QSoundInstance::prepareNewVariation()
     detach();
 
     m_bindBuffer = playVar->sampleObject()->soundBuffer();
-    if (m_bindBuffer->isReady()) {
+    if (m_bindBuffer->state() == QSoundBuffer::Ready) {
         Q_ASSERT(m_soundSource);
         m_soundSource->bindBuffer(m_bindBuffer);
         m_isReady = true;

src/imports/audioengine/qsoundsource_openal_p.cpp

@@ -85,7 +85,7 @@ void QSoundSourcePrivate::release()
 void QSoundSourcePrivate::bindBuffer(QSoundBuffer* soundBuffer)
 {
     unbindBuffer();
-    Q_ASSERT(soundBuffer->isReady());
+    Q_ASSERT(soundBuffer->state() == QSoundBuffer::Ready);
     m_bindBuffer = qobject_cast<QSoundBufferPrivateAL*>(soundBuffer);
     m_bindBuffer->bindToSource(m_alSource);
     m_isReady = true;