Added audio track playback API (52ac301e) · Commits · e / os / android_frameworks_base

media/java/android/media/videoeditor/AudioTrack.java

+173 −1

Original line number	Diff line number	Diff line
		@@ -18,12 +18,17 @@ package android.media.videoeditor;

		import java.io.IOException;

		import android.util.Log;

		/**
		* This class allows to handle an audio track. This audio file is mixed with the
		* audio samples of the MediaItems.
		* {@hide}
		*/
		public class AudioTrack {
		// Logging
		private static final String TAG = "AudioTrack";

		// Instance variables
		private final String mUniqueId;
		private final String mFilename;
		@@ -47,6 +52,129 @@ public class AudioTrack {

		// The audio waveform filename
		private String mAudioWaveformFilename;
		private PlaybackThread mPlaybackThread;

		/**
		* This listener interface is used by the AudioTrack to emit playback
		* progress notifications.
		*/
		public interface PlaybackProgressListener {
		/**
		* This method notifies the listener of the current time position while
		* playing an audio track
		*
		* @param audioTrack The audio track
		* @param timeMs The current playback position (expressed in milliseconds
		* since the beginning of the audio track).
		* @param end true if the end of the audio track was reached
		*/
		public void onProgress(AudioTrack audioTrack, long timeMs, boolean end);
		}

		/**
		* The playback thread
		*/
		private class PlaybackThread extends Thread {
		// Instance variables
		private final PlaybackProgressListener mListener;
		private final long mFromMs, mToMs;
		private boolean mRun;
		private final boolean mLoop;
		private long mPositionMs;

		/**
		* Constructor
		*
		* @param fromMs The time (relative to the beginning of the audio track)
		* at which the playback will start
		* @param toMs The time (relative to the beginning of the audio track) at
		* which the playback will stop. Use -1 to play to the end of
		* the audio track
		* @param loop true if the playback should be looped once it reaches the
		* end
		* @param listener The listener which will be notified of the playback
		* progress
		*/
		public PlaybackThread(long fromMs, long toMs, boolean loop,
		PlaybackProgressListener listener) {
		mPositionMs = mFromMs = fromMs;
		if (toMs < 0) {
		mToMs = mDurationMs;
		} else {
		mToMs = toMs;
		}
		mLoop = loop;
		mListener = listener;
		mRun = true;
		}

		/*
		* {@inheritDoc}
		*/
		@Override
		public void run() {
		if (Log.isLoggable(TAG, Log.DEBUG)) {
		Log.d(TAG, "===> PlaybackThread.run enter");
		}

		while (mRun) {
		try {
		sleep(100);
		} catch (InterruptedException ex) {
		break;
		}

		mPositionMs += 100;

		if (mPositionMs >= mToMs) {
		if (!mLoop) {
		if (mListener != null) {
		mListener.onProgress(AudioTrack.this, mPositionMs, true);
		}
		if (Log.isLoggable(TAG, Log.DEBUG)) {
		Log.d(TAG, "PlaybackThread.run playback complete");
		}
		break;
		} else {
		// Fire a notification for the end of the clip
		if (mListener != null) {
		mListener.onProgress(AudioTrack.this, mToMs, false);
		}

		// Rewind
		mPositionMs = mFromMs;
		if (mListener != null) {
		mListener.onProgress(AudioTrack.this, mPositionMs, false);
		}
		if (Log.isLoggable(TAG, Log.DEBUG)) {
		Log.d(TAG, "PlaybackThread.run playback complete");
		}
		}
		} else {
		if (mListener != null) {
		mListener.onProgress(AudioTrack.this, mPositionMs, false);
		}
		}
		}
		if (Log.isLoggable(TAG, Log.DEBUG)) {
		Log.d(TAG, "===> PlaybackThread.run exit");
		}
		}

		/**
		* Stop the playback
		*
		* @return The stop position
		*/
		public long stopPlayback() {
		mRun = false;
		try {
		join();
		} catch (InterruptedException ex) {
		}
		return mPositionMs;
		}
		};

		/**
		* An object of this type cannot be instantiated by using the default
		@@ -99,7 +227,7 @@ public class AudioTrack {
		}

		/**
		* @return The id of the media item
		* @return The id of the audio track
		*/
		public String getId() {
		return mUniqueId;
		@@ -311,6 +439,50 @@ public class AudioTrack {
		return mDuckingLowVolume;
		}

		/**
		* Start the playback of this audio track. This method does not block (does
		* not wait for the playback to complete).
		*
		* @param fromMs The time (relative to the beginning of the audio track) at
		* which the playback will start
		* @param toMs The time (relative to the beginning of the audio track) at
		* which the playback will stop. Use -1 to play to the end of the
		* audio track
		* @param loop true if the playback should be looped once it reaches the end
		* @param listener The listener which will be notified of the playback
		* progress
		* @throws IllegalArgumentException if fromMs or toMs is beyond the playback
		* duration
		* @throws IllegalStateException if a playback, preview or an export is
		* already in progress
		*/
		public void startPlayback(long fromMs, long toMs, boolean loop,
		PlaybackProgressListener listener) {
		if (fromMs >= mDurationMs) {
		return;
		}
		mPlaybackThread = new PlaybackThread(fromMs, toMs, loop, listener);
		mPlaybackThread.start();
		}

		/**
		* Stop the audio track playback. This method blocks until the ongoing
		* playback is stopped.
		*
		* @return The accurate current time when stop is effective expressed in
		* milliseconds
		*/
		public long stopPlayback() {
		final long stopTimeMs;
		if (mPlaybackThread != null) {
		stopTimeMs = mPlaybackThread.stopPlayback();
		mPlaybackThread = null;
		} else {
		stopTimeMs = 0;
		}
		return stopTimeMs;
		}

		/**
		* This API allows to generate a file containing the sample volume levels of
		* this audio track object. This function may take significant time and is

media/java/android/media/videoeditor/VideoEditorTestImpl.java

+5 −8

Original line number	Diff line number	Diff line
		@@ -537,16 +537,13 @@ public class VideoEditorTestImpl implements VideoEditor {
		* {@inheritDoc}
		*/
		public AudioTrack getAudioTrack(String audioTrackId) {
		if (mPreviewThread != null) {
		throw new IllegalStateException("Previewing is in progress");
		for (AudioTrack at : mAudioTracks) {
		if (at.getId().equals(audioTrackId)) {
		return at;
		}

		final AudioTrack audioTrack = getAudioTrack(audioTrackId);
		if (audioTrack != null) {
		mAudioTracks.remove(audioTrack);
		}

		return audioTrack;
		return null;
		}

		/*