| package org.sflphone.service; |
| |
| import android.annotation.TargetApi; |
| import android.content.Context; |
| import android.media.AudioManager; |
| import android.os.Build; |
| import android.util.Log; |
| |
| /** |
| * This class illustrates how to query OpenSL config parameters on Jelly Bean MR1 while maintaining |
| * backward compatibility with older versions of Android. The trick is to place the new API calls in |
| * an inner class that will only be loaded if we're running on JB MR1 or later. |
| */ |
| public abstract class OpenSlParams { |
| |
| /** |
| * @return The recommended sample rate in Hz. |
| */ |
| public abstract int getSampleRate(); |
| |
| /** |
| * @return The recommended buffer size in frames. |
| */ |
| public abstract int getBufferSize(); |
| |
| /** |
| * @param context, e.g., the current activity. |
| * @return OpenSlParams instance for the given context. |
| */ |
| public static OpenSlParams createInstance(Context context) { |
| return (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) |
| ? new JellyBeanMr1OpenSlParams(context) |
| : new DefaultOpenSlParams(); |
| } |
| |
| private OpenSlParams() { |
| // Not meant to be instantiated except here. |
| } |
| |
| // Implementation for Jelly Bean MR1 or later. |
| @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1) |
| private static class JellyBeanMr1OpenSlParams extends OpenSlParams { |
| |
| private final int sampleRate; |
| private final int bufferSize; |
| |
| private JellyBeanMr1OpenSlParams(Context context) { |
| AudioManager am = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE); |
| // Provide default values in case config lookup fails. |
| int sr = 44100; |
| int bs = 64; |
| try { |
| // If possible, query the native sample rate and buffer size. |
| sr = Integer.parseInt(am.getProperty(AudioManager.PROPERTY_OUTPUT_SAMPLE_RATE)); |
| bs = Integer.parseInt(am.getProperty(AudioManager.PROPERTY_OUTPUT_FRAMES_PER_BUFFER)); |
| } catch (NumberFormatException e) { |
| Log.w(getClass().getName(), "Failed to read native OpenSL config: " + e); |
| } |
| sampleRate = sr; |
| bufferSize = bs; |
| } |
| |
| @Override |
| public int getSampleRate() { |
| return sampleRate; |
| } |
| |
| @Override |
| public int getBufferSize() { |
| return bufferSize; |
| } |
| }; |
| |
| // Default factory for Jelly Bean or older. |
| private static class DefaultOpenSlParams extends OpenSlParams { |
| @Override |
| public int getSampleRate() { |
| return 44100; |
| } |
| |
| @Override |
| public int getBufferSize() { |
| return 64; |
| } |
| }; |
| } |