Added waveform data support (4545f735) · Commits · e / os / android_frameworks_base

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

+17 −1

Original line number	Diff line number	Diff line
		@@ -48,6 +48,8 @@ public class AudioTrack {

		// The audio waveform filename
		private String mAudioWaveformFilename;
		// The audio waveform data
		private WaveformData mWaveformData;

		/**
		* An object of this type cannot be instantiated by using the default
		@@ -103,6 +105,7 @@ public class AudioTrack {

		// The audio waveform file is generated later
		mAudioWaveformFilename = null;
		mWaveformData = null;
		}

		/**
		@@ -161,6 +164,11 @@ public class AudioTrack {
		mDuckedTrackVolume = duckedTrackVolume;

		mAudioWaveformFilename = audioWaveformFilename;
		if (audioWaveformFilename != null) {
		mWaveformData = new WaveformData(audioWaveformFilename);
		} else {
		mWaveformData = null;
		}
		}

		/**
		@@ -416,6 +424,7 @@ public class AudioTrack {
		throws IOException {
		// TODO: Set mAudioWaveformFilename at the end once the extract is
		// complete
		mWaveformData = new WaveformData(mAudioWaveformFilename);
		}

		/**
		@@ -431,10 +440,17 @@ public class AudioTrack {
		*
		* @return the name of the file, null if the file does not exist
		*/
		public String getAudioWaveformFilename() {
		String getAudioWaveformFilename() {
		return mAudioWaveformFilename;
		}

		/**
		* @return The waveform data
		*/
		public WaveformData getWaveformData() {
		return mWaveformData;
		}

		/*
		* {@inheritDoc}
		*/

media/java/android/media/videoeditor/MediaVideoItem.java

+16 −1

Original line number	Diff line number	Diff line
		@@ -46,6 +46,8 @@ public class MediaVideoItem extends MediaItem {
		private int mVolumePercentage;
		private boolean mMuted;
		private String mAudioWaveformFilename;
		// The audio waveform data
		private WaveformData mWaveformData;

		/**
		* An object of this type cannot be instantiated with a default constructor
		@@ -115,6 +117,11 @@ public class MediaVideoItem extends MediaItem {
		mVolumePercentage = volumePercent;
		mMuted = muted;
		mAudioWaveformFilename = audioWaveformFilename;
		if (audioWaveformFilename != null) {
		mWaveformData = new WaveformData(audioWaveformFilename);
		} else {
		mWaveformData = null;
		}
		}

		/**
		@@ -286,6 +293,7 @@ public class MediaVideoItem extends MediaItem {
		public void extractAudioWaveform(ExtractAudioWaveformProgressListener listener)
		throws IOException {
		// TODO: Set mAudioWaveformFilename at the end once the export is complete
		mWaveformData = new WaveformData(mAudioWaveformFilename);
		}

		/**
		@@ -299,10 +307,17 @@ public class MediaVideoItem extends MediaItem {
		* @return the name of the file, null if the file has not been computed or
		* if there is no Audio track in the mediaItem
		*/
		public String getAudioWaveformFilename() {
		String getAudioWaveformFilename() {
		return mAudioWaveformFilename;
		}

		/**
		* @return The waveform data
		*/
		public WaveformData getWaveformData() {
		return mWaveformData;
		}

		/**
		* Set volume of the Audio track of this mediaItem
		*

media/java/android/media/videoeditor/WaveformData.java

0 → 100644

+78 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2010 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		package android.media.videoeditor;

		/**
		* Class which describes the waveform data of an audio track. The gain values
		* represent the average gain for an audio frame. For audio codecs which do
		* not operate on a per frame bases (eg. ALAW, ULAW) a reasonable audio frame
		* duration will be assumed (eg. 50ms).
		* {@hide}
		*/
		public class WaveformData {
		// Instance variables
		final int mFrameDurationMs;
		final int mFramesCount;
		final short[] mGains;

		/**
		* This constructor shall not be used
		*/
		@SuppressWarnings("unused")
		private WaveformData() {
		mFrameDurationMs = 0;
		mFramesCount = 0;
		mGains = null;
		}

		/**
		* Constructor
		*
		* @param audioWaveformFilename The name of the audio waveform file
		*/
		WaveformData(String audioWaveformFilename) {
		// TODO: Read these values from the file
		mFrameDurationMs = 20;
		mFramesCount = 300000 / mFrameDurationMs;
		mGains = new short[mFramesCount];
		for (int i = 0; i < mFramesCount; i++) {
		mGains[i] = (short)((i * 5) % 256);
		}
		}

		/**
		* @return The duration of a frame in milliseconds
		*/
		public int getFrameDuration() {
		return mFrameDurationMs;
		}

		/**
		* @return The number of frames within the waveform data
		*/
		public int getFramesCount() {
		return mFramesCount;
		}

		/**
		* @return The array of frame gains. The size of the array is the frames
		* count. The values of the frame gains range from 0 to 256.
		*/
		public short[] getFrameGains() {
		return mGains;
		}
		}