use sequence parameters as audio output parameters

app/audio/audiomanager.cpp

@@ -90,22 +90,63 @@ void AudioManager::SetOutputDevice(const QAudioDeviceInfo &info)
 
   StopOutput();
 
-  QAudioFormat format;
-  format.setSampleRate(48000);
-  format.setChannelCount(2);
-  format.setSampleSize(32);
-  format.setCodec("audio/pcm");
-  format.setByteOrder(QAudioFormat::LittleEndian);
-  format.setSampleType(QAudioFormat::Float);
-
-  output_ = std::unique_ptr<QAudioOutput>(new QAudioOutput(info, format, this));
-  connect(output_.get(), SIGNAL(notify()), this, SLOT(OutputNotified()));
   output_device_info_ = info;
 
+  if (output_params_.is_valid()) {
+    QAudioFormat format;
+    format.setSampleRate(output_params_.sample_rate());
+    format.setChannelCount(output_params_.channel_count());
+    format.setCodec("audio/pcm");
+    format.setByteOrder(QAudioFormat::LittleEndian);
+
+    switch (output_params_.format()) {
+    case SAMPLE_FMT_U8:
+      format.setSampleSize(8);
+      format.setSampleType(QAudioFormat::UnSignedInt);
+      break;
+    case SAMPLE_FMT_S16:
+      format.setSampleSize(16);
+      format.setSampleType(QAudioFormat::SignedInt);
+      break;
+    case SAMPLE_FMT_S32:
+      format.setSampleSize(32);
+      format.setSampleType(QAudioFormat::SignedInt);
+      break;
+    case SAMPLE_FMT_S64:
+      format.setSampleSize(64);
+      format.setSampleType(QAudioFormat::SignedInt);
+      break;
+    case SAMPLE_FMT_FLT:
+      format.setSampleSize(32);
+      format.setSampleType(QAudioFormat::Float);
+      break;
+    case SAMPLE_FMT_DBL:
+      format.setSampleSize(64);
+      format.setSampleType(QAudioFormat::Float);
+      break;
+    case SAMPLE_FMT_COUNT:
+    case SAMPLE_FMT_INVALID:
+      Q_ASSERT(false);
+    }
+
+    output_ = std::unique_ptr<QAudioOutput>(new QAudioOutput(info, format, this));
+    connect(output_.get(), SIGNAL(notify()), this, SLOT(OutputNotified()));
+  }
+
   // Un-comment this to get debug information about what the audio output is doing
   //connect(output_.get(), SIGNAL(stateChanged(QAudio::State)), this, SLOT(OutputStateChanged(QAudio::State)));
 }
 
+void AudioManager::SetOutputParams(const AudioRenderingParams &params)
+{
+  if (output_params_ != params) {
+    output_params_ = params;
+
+    // Refresh output device
+    SetOutputDevice(output_device_info_);
+  }
+}
+
 void AudioManager::SetInputDevice(const QAudioDeviceInfo &info)
 {
   input_ = std::unique_ptr<QAudioInput>(new QAudioInput(info, QAudioFormat(), this));

app/audio/audiomanager.h

@@ -27,6 +27,7 @@
 #include <QThread>
 
 #include "audiohybriddevice.h"
+#include "render/audioparams.h"
 
 /**
  * @brief A thread for refreshing the total list of devices on the system
@@ -86,6 +87,8 @@ public:
 
   void SetOutputDevice(const QAudioDeviceInfo& info);
 
+  void SetOutputParams(const AudioRenderingParams& params);
+
   void SetInputDevice(const QAudioDeviceInfo& info);
 
   const QList<QAudioDeviceInfo>& ListInputDevices();
@@ -109,6 +112,7 @@ private:
 
   std::unique_ptr<QAudioOutput> output_;
   QAudioDeviceInfo output_device_info_;
+  AudioRenderingParams output_params_;
 
   std::unique_ptr<QAudioInput> input_;
   QAudioDeviceInfo input_device_info_;

app/render/audioparams.cpp

@@ -48,6 +48,20 @@ const SampleFormat &AudioRenderingParams::format() const
   return format_;
 }
 
+bool AudioRenderingParams::operator==(const AudioRenderingParams &other)
+{
+  return (format() == other.format()
+          && sample_rate() == other.sample_rate()
+          && channel_layout() == other.channel_layout());
+}
+
+bool AudioRenderingParams::operator!=(const AudioRenderingParams &other)
+{
+  return (format() != other.format()
+          || sample_rate() != other.sample_rate()
+          || channel_layout() != other.channel_layout());
+}
+
 int AudioRenderingParams::time_to_bytes(const rational &time) const
 {
   Q_ASSERT(is_valid());

app/render/audioparams.h

@@ -38,6 +38,9 @@ public:
 
   const SampleFormat& format() const;
 
+  bool operator==(const AudioRenderingParams& other);
+  bool operator!=(const AudioRenderingParams& other);
+
 private:
   SampleFormat format_;
 };

app/widget/viewer/viewer.cpp

@@ -210,6 +210,7 @@ void ViewerWidget::PlayInternal(int speed)
   QIODevice* audio_src = audio_renderer_->GetAudioPullDevice();
   if (audio_src != nullptr && audio_src->open(QIODevice::ReadOnly)) {
     audio_src->seek(audio_renderer_->params().time_to_bytes(GetTime()));
+    AudioManager::instance()->SetOutputParams(audio_renderer_->params());
     AudioManager::instance()->StartOutput(audio_src);
   }
 
@@ -235,6 +236,7 @@ void ViewerWidget::PushScrubbedAudio()
       // Push audio
       audio_src->seek(audio_renderer_->params().time_to_bytes(GetTime()));
       QByteArray frame_audio = audio_src->read(size_of_sample);
+      AudioManager::instance()->SetOutputParams(audio_renderer_->params());
       AudioManager::instance()->PushToOutput(frame_audio);
 
       audio_src->close();