LibAudio: Added playback control features to audio server

LibAudio now supports pausing playback, clearing the buffer queue,
retrieving the played samples since the last clear and retrieving
the currently playing shared buffer id

Libraries/LibAudio/AClientConnection.cpp

@@ -46,3 +46,23 @@ int AClientConnection::get_remaining_samples()
 {
     return send_sync<AudioServer::GetRemainingSamples>()->remaining_samples();
 }
+
+int AClientConnection::get_played_samples()
+{
+    return send_sync<AudioServer::GetPlayedSamples>()->played_samples();
+}
+
+void AClientConnection::set_paused(bool paused)
+{
+    send_sync<AudioServer::SetPaused>(paused);
+}
+
+void AClientConnection::clear_buffer(bool paused)
+{
+    send_sync<AudioServer::ClearBuffer>(paused);
+}
+
+int AClientConnection::get_playing_buffer()
+{
+    return send_sync<AudioServer::GetPlayingBuffer>()->buffer_id();
+}

Libraries/LibAudio/AClientConnection.h

@@ -18,4 +18,9 @@ public:
     void set_main_mix_volume(int);
 
     int get_remaining_samples();
+    int get_played_samples();
+    int get_playing_buffer();
+
+    void set_paused(bool paused);
+    void clear_buffer(bool paused = false);
 };

Libraries/LibAudio/AWavLoader.cpp

@@ -31,6 +31,20 @@ RefPtr<ABuffer> AWavLoader::get_more_samples(size_t max_bytes_to_read_from_input
     return buffer;
 }
 
+void AWavLoader::seek(const int position)
+{
+    if (position < 0 || position > m_total_samples)
+        return;
+
+    m_loaded_samples = position;
+    m_file->seek(position * m_num_channels * (m_bits_per_sample / 8));
+}
+
+void AWavLoader::reset()
+{
+    seek(0);
+}
+
 bool AWavLoader::parse_header()
 {
     CIODeviceStreamReader stream(*m_file);
@@ -80,7 +94,7 @@ bool AWavLoader::parse_header()
 
     u16 audio_format;
     stream >> audio_format;
-    CHECK_OK("Audio format"); // incomplete read check
+    CHECK_OK("Audio format");     // incomplete read check
     ok = ok && audio_format == 1; // WAVE_FORMAT_PCM
     ASSERT(audio_format == 1);
     CHECK_OK("Audio format"); // value check
@@ -161,7 +175,7 @@ bool AResampleHelper::read_sample(float& next_l, float& next_r)
     return false;
 }
 
-template <typename SampleReader>
+template<typename SampleReader>
 static void read_samples_from_stream(BufferStream& stream, SampleReader read_sample, Vector<ASample>& samples, AResampleHelper& resampler, int num_channels)
 {
     float norm_l = 0;
@@ -169,7 +183,7 @@ static void read_samples_from_stream(BufferStream& stream, SampleReader read_sam
 
     switch (num_channels) {
     case 1:
-        for(;;) {
+        for (;;) {
             while (resampler.read_sample(norm_l, norm_r)) {
                 samples.append(ASample(norm_l));
             }
@@ -182,7 +196,7 @@ static void read_samples_from_stream(BufferStream& stream, SampleReader read_sam
         }
         break;
     case 2:
-        for(;;) {
+        for (;;) {
             while (resampler.read_sample(norm_l, norm_r)) {
                 samples.append(ASample(norm_l, norm_r));
             }
@@ -238,8 +252,7 @@ RefPtr<ABuffer> ABuffer::from_pcm_data(ByteBuffer& data, AResampleHelper& resamp
 {
     BufferStream stream(data);
     Vector<ASample> fdata;
-    fdata.ensure_capacity(data.size() * 2);
-
+    fdata.ensure_capacity(data.size() / (bits_per_sample / 8));
 #ifdef AWAVLOADER_DEBUG
     dbg() << "Reading " << bits_per_sample << " bits and " << num_channels << " channels, total bytes: " << data.size();
 #endif

Libraries/LibAudio/AWavLoader.h

@@ -22,6 +22,9 @@ public:
 
     RefPtr<ABuffer> get_more_samples(size_t max_bytes_to_read_from_input = 128 * KB);
 
+    void reset();
+    void seek(const int position);
+
     int loaded_samples() const { return m_loaded_samples; }
     int total_samples() const { return m_total_samples; }
     u32 sample_rate() const { return m_sample_rate; }