| /* |
| * Copyright (c) 2015 The WebRTC project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| package org.webrtc.audio; |
| |
| import android.annotation.TargetApi; |
| import android.content.Context; |
| import android.media.AudioFormat; |
| import android.media.AudioManager; |
| import android.media.AudioRecord; |
| import android.media.MediaRecorder.AudioSource; |
| import android.os.Process; |
| import java.lang.System; |
| import java.nio.ByteBuffer; |
| import java.util.Arrays; |
| import java.util.concurrent.TimeUnit; |
| import javax.annotation.Nullable; |
| import org.webrtc.CalledByNative; |
| import org.webrtc.Logging; |
| import org.webrtc.ThreadUtils; |
| import org.webrtc.audio.JavaAudioDeviceModule.AudioRecordErrorCallback; |
| import org.webrtc.audio.JavaAudioDeviceModule.AudioRecordStartErrorCode; |
| import org.webrtc.audio.JavaAudioDeviceModule.SamplesReadyCallback; |
| |
| class WebRtcAudioRecord { |
| private static final String TAG = "WebRtcAudioRecordExternal"; |
| |
| // Default audio data format is PCM 16 bit per sample. |
| // Guaranteed to be supported by all devices. |
| private static final int BITS_PER_SAMPLE = 16; |
| |
| // Requested size of each recorded buffer provided to the client. |
| private static final int CALLBACK_BUFFER_SIZE_MS = 10; |
| |
| // Average number of callbacks per second. |
| private static final int BUFFERS_PER_SECOND = 1000 / CALLBACK_BUFFER_SIZE_MS; |
| |
| // We ask for a native buffer size of BUFFER_SIZE_FACTOR * (minimum required |
| // buffer size). The extra space is allocated to guard against glitches under |
| // high load. |
| private static final int BUFFER_SIZE_FACTOR = 2; |
| |
| // The AudioRecordJavaThread is allowed to wait for successful call to join() |
| // but the wait times out afther this amount of time. |
| private static final long AUDIO_RECORD_THREAD_JOIN_TIMEOUT_MS = 2000; |
| |
| public static final int DEFAULT_AUDIO_SOURCE = AudioSource.VOICE_COMMUNICATION; |
| |
| private final Context context; |
| private final AudioManager audioManager; |
| private final int audioSource; |
| |
| private long nativeAudioRecord; |
| |
| private final WebRtcAudioEffects effects = new WebRtcAudioEffects(); |
| |
| private @Nullable ByteBuffer byteBuffer; |
| |
| private @Nullable AudioRecord audioRecord; |
| private @Nullable AudioRecordThread audioThread; |
| |
| private volatile boolean microphoneMute; |
| private byte[] emptyBytes; |
| |
| private final @Nullable AudioRecordErrorCallback errorCallback; |
| private final @Nullable SamplesReadyCallback audioSamplesReadyCallback; |
| private final boolean isAcousticEchoCancelerSupported; |
| private final boolean isNoiseSuppressorSupported; |
| |
| /** |
| * Audio thread which keeps calling ByteBuffer.read() waiting for audio |
| * to be recorded. Feeds recorded data to the native counterpart as a |
| * periodic sequence of callbacks using DataIsRecorded(). |
| * This thread uses a Process.THREAD_PRIORITY_URGENT_AUDIO priority. |
| */ |
| private class AudioRecordThread extends Thread { |
| private volatile boolean keepAlive = true; |
| |
| public AudioRecordThread(String name) { |
| super(name); |
| } |
| |
| @Override |
| public void run() { |
| Process.setThreadPriority(Process.THREAD_PRIORITY_URGENT_AUDIO); |
| Logging.d(TAG, "AudioRecordThread" + WebRtcAudioUtils.getThreadInfo()); |
| assertTrue(audioRecord.getRecordingState() == AudioRecord.RECORDSTATE_RECORDING); |
| |
| long lastTime = System.nanoTime(); |
| while (keepAlive) { |
| int bytesRead = audioRecord.read(byteBuffer, byteBuffer.capacity()); |
| if (bytesRead == byteBuffer.capacity()) { |
| if (microphoneMute) { |
| byteBuffer.clear(); |
| byteBuffer.put(emptyBytes); |
| } |
| // It's possible we've been shut down during the read, and stopRecording() tried and |
| // failed to join this thread. To be a bit safer, try to avoid calling any native methods |
| // in case they've been unregistered after stopRecording() returned. |
| if (keepAlive) { |
| nativeDataIsRecorded(nativeAudioRecord, bytesRead); |
| } |
| if (audioSamplesReadyCallback != null) { |
| // Copy the entire byte buffer array. The start of the byteBuffer is not necessarily |
| // at index 0. |
| byte[] data = Arrays.copyOfRange(byteBuffer.array(), byteBuffer.arrayOffset(), |
| byteBuffer.capacity() + byteBuffer.arrayOffset()); |
| audioSamplesReadyCallback.onWebRtcAudioRecordSamplesReady( |
| new JavaAudioDeviceModule.AudioSamples(audioRecord.getAudioFormat(), |
| audioRecord.getChannelCount(), audioRecord.getSampleRate(), data)); |
| } |
| } else { |
| String errorMessage = "AudioRecord.read failed: " + bytesRead; |
| Logging.e(TAG, errorMessage); |
| if (bytesRead == AudioRecord.ERROR_INVALID_OPERATION) { |
| keepAlive = false; |
| reportWebRtcAudioRecordError(errorMessage); |
| } |
| } |
| } |
| |
| try { |
| if (audioRecord != null) { |
| audioRecord.stop(); |
| } |
| } catch (IllegalStateException e) { |
| Logging.e(TAG, "AudioRecord.stop failed: " + e.getMessage()); |
| } |
| } |
| |
| // Stops the inner thread loop and also calls AudioRecord.stop(). |
| // Does not block the calling thread. |
| public void stopThread() { |
| Logging.d(TAG, "stopThread"); |
| keepAlive = false; |
| } |
| } |
| |
| @CalledByNative |
| WebRtcAudioRecord(Context context, AudioManager audioManager) { |
| this(context, audioManager, DEFAULT_AUDIO_SOURCE, null /* errorCallback */, |
| null /* audioSamplesReadyCallback */, WebRtcAudioEffects.isAcousticEchoCancelerSupported(), |
| WebRtcAudioEffects.isNoiseSuppressorSupported()); |
| } |
| |
| public WebRtcAudioRecord(Context context, AudioManager audioManager, int audioSource, |
| @Nullable AudioRecordErrorCallback errorCallback, |
| @Nullable SamplesReadyCallback audioSamplesReadyCallback, |
| boolean isAcousticEchoCancelerSupported, boolean isNoiseSuppressorSupported) { |
| if (isAcousticEchoCancelerSupported && !WebRtcAudioEffects.isAcousticEchoCancelerSupported()) { |
| throw new IllegalArgumentException("HW AEC not supported"); |
| } |
| if (isNoiseSuppressorSupported && !WebRtcAudioEffects.isNoiseSuppressorSupported()) { |
| throw new IllegalArgumentException("HW NS not supported"); |
| } |
| this.context = context; |
| this.audioManager = audioManager; |
| this.audioSource = audioSource; |
| this.errorCallback = errorCallback; |
| this.audioSamplesReadyCallback = audioSamplesReadyCallback; |
| this.isAcousticEchoCancelerSupported = isAcousticEchoCancelerSupported; |
| this.isNoiseSuppressorSupported = isNoiseSuppressorSupported; |
| } |
| |
| @CalledByNative |
| public void setNativeAudioRecord(long nativeAudioRecord) { |
| this.nativeAudioRecord = nativeAudioRecord; |
| } |
| |
| @CalledByNative |
| boolean isAcousticEchoCancelerSupported() { |
| return isAcousticEchoCancelerSupported; |
| } |
| |
| @CalledByNative |
| boolean isNoiseSuppressorSupported() { |
| return isNoiseSuppressorSupported; |
| } |
| |
| @CalledByNative |
| private boolean enableBuiltInAEC(boolean enable) { |
| Logging.d(TAG, "enableBuiltInAEC(" + enable + ")"); |
| return effects.setAEC(enable); |
| } |
| |
| @CalledByNative |
| private boolean enableBuiltInNS(boolean enable) { |
| Logging.d(TAG, "enableBuiltInNS(" + enable + ")"); |
| return effects.setNS(enable); |
| } |
| |
| @CalledByNative |
| private int initRecording(int sampleRate, int channels) { |
| Logging.d(TAG, "initRecording(sampleRate=" + sampleRate + ", channels=" + channels + ")"); |
| if (audioRecord != null) { |
| reportWebRtcAudioRecordInitError("InitRecording called twice without StopRecording."); |
| return -1; |
| } |
| final int bytesPerFrame = channels * (BITS_PER_SAMPLE / 8); |
| final int framesPerBuffer = sampleRate / BUFFERS_PER_SECOND; |
| byteBuffer = ByteBuffer.allocateDirect(bytesPerFrame * framesPerBuffer); |
| if (!(byteBuffer.hasArray())) { |
| reportWebRtcAudioRecordInitError("ByteBuffer does not have backing array."); |
| return -1; |
| } |
| Logging.d(TAG, "byteBuffer.capacity: " + byteBuffer.capacity()); |
| emptyBytes = new byte[byteBuffer.capacity()]; |
| // Rather than passing the ByteBuffer with every callback (requiring |
| // the potentially expensive GetDirectBufferAddress) we simply have the |
| // the native class cache the address to the memory once. |
| nativeCacheDirectBufferAddress(nativeAudioRecord, byteBuffer); |
| |
| // Get the minimum buffer size required for the successful creation of |
| // an AudioRecord object, in byte units. |
| // Note that this size doesn't guarantee a smooth recording under load. |
| final int channelConfig = channelCountToConfiguration(channels); |
| int minBufferSize = |
| AudioRecord.getMinBufferSize(sampleRate, channelConfig, AudioFormat.ENCODING_PCM_16BIT); |
| if (minBufferSize == AudioRecord.ERROR || minBufferSize == AudioRecord.ERROR_BAD_VALUE) { |
| reportWebRtcAudioRecordInitError("AudioRecord.getMinBufferSize failed: " + minBufferSize); |
| return -1; |
| } |
| Logging.d(TAG, "AudioRecord.getMinBufferSize: " + minBufferSize); |
| |
| // Use a larger buffer size than the minimum required when creating the |
| // AudioRecord instance to ensure smooth recording under load. It has been |
| // verified that it does not increase the actual recording latency. |
| int bufferSizeInBytes = Math.max(BUFFER_SIZE_FACTOR * minBufferSize, byteBuffer.capacity()); |
| Logging.d(TAG, "bufferSizeInBytes: " + bufferSizeInBytes); |
| try { |
| audioRecord = new AudioRecord(audioSource, sampleRate, channelConfig, |
| AudioFormat.ENCODING_PCM_16BIT, bufferSizeInBytes); |
| } catch (IllegalArgumentException e) { |
| reportWebRtcAudioRecordInitError("AudioRecord ctor error: " + e.getMessage()); |
| releaseAudioResources(); |
| return -1; |
| } |
| if (audioRecord == null || audioRecord.getState() != AudioRecord.STATE_INITIALIZED) { |
| reportWebRtcAudioRecordInitError("Failed to create a new AudioRecord instance"); |
| releaseAudioResources(); |
| return -1; |
| } |
| effects.enable(audioRecord.getAudioSessionId()); |
| logMainParameters(); |
| logMainParametersExtended(); |
| return framesPerBuffer; |
| } |
| |
| @CalledByNative |
| private boolean startRecording() { |
| Logging.d(TAG, "startRecording"); |
| assertTrue(audioRecord != null); |
| assertTrue(audioThread == null); |
| try { |
| audioRecord.startRecording(); |
| } catch (IllegalStateException e) { |
| reportWebRtcAudioRecordStartError(AudioRecordStartErrorCode.AUDIO_RECORD_START_EXCEPTION, |
| "AudioRecord.startRecording failed: " + e.getMessage()); |
| return false; |
| } |
| if (audioRecord.getRecordingState() != AudioRecord.RECORDSTATE_RECORDING) { |
| reportWebRtcAudioRecordStartError(AudioRecordStartErrorCode.AUDIO_RECORD_START_STATE_MISMATCH, |
| "AudioRecord.startRecording failed - incorrect state :" |
| + audioRecord.getRecordingState()); |
| return false; |
| } |
| audioThread = new AudioRecordThread("AudioRecordJavaThread"); |
| audioThread.start(); |
| return true; |
| } |
| |
| @CalledByNative |
| private boolean stopRecording() { |
| Logging.d(TAG, "stopRecording"); |
| assertTrue(audioThread != null); |
| audioThread.stopThread(); |
| if (!ThreadUtils.joinUninterruptibly(audioThread, AUDIO_RECORD_THREAD_JOIN_TIMEOUT_MS)) { |
| Logging.e(TAG, "Join of AudioRecordJavaThread timed out"); |
| WebRtcAudioUtils.logAudioState(TAG, context, audioManager); |
| } |
| audioThread = null; |
| effects.release(); |
| releaseAudioResources(); |
| return true; |
| } |
| |
| private void logMainParameters() { |
| Logging.d(TAG, |
| "AudioRecord: " |
| + "session ID: " + audioRecord.getAudioSessionId() + ", " |
| + "channels: " + audioRecord.getChannelCount() + ", " |
| + "sample rate: " + audioRecord.getSampleRate()); |
| } |
| |
| @TargetApi(23) |
| private void logMainParametersExtended() { |
| if (WebRtcAudioUtils.runningOnMarshmallowOrHigher()) { |
| Logging.d(TAG, |
| "AudioRecord: " |
| // The frame count of the native AudioRecord buffer. |
| + "buffer size in frames: " + audioRecord.getBufferSizeInFrames()); |
| } |
| } |
| |
| // Helper method which throws an exception when an assertion has failed. |
| private static void assertTrue(boolean condition) { |
| if (!condition) { |
| throw new AssertionError("Expected condition to be true"); |
| } |
| } |
| |
| private int channelCountToConfiguration(int channels) { |
| return (channels == 1 ? AudioFormat.CHANNEL_IN_MONO : AudioFormat.CHANNEL_IN_STEREO); |
| } |
| |
| private native void nativeCacheDirectBufferAddress( |
| long nativeAudioRecordJni, ByteBuffer byteBuffer); |
| private native void nativeDataIsRecorded(long nativeAudioRecordJni, int bytes); |
| |
| // Sets all recorded samples to zero if |mute| is true, i.e., ensures that |
| // the microphone is muted. |
| public void setMicrophoneMute(boolean mute) { |
| Logging.w(TAG, "setMicrophoneMute(" + mute + ")"); |
| microphoneMute = mute; |
| } |
| |
| // Releases the native AudioRecord resources. |
| private void releaseAudioResources() { |
| Logging.d(TAG, "releaseAudioResources"); |
| if (audioRecord != null) { |
| audioRecord.release(); |
| audioRecord = null; |
| } |
| } |
| |
| private void reportWebRtcAudioRecordInitError(String errorMessage) { |
| Logging.e(TAG, "Init recording error: " + errorMessage); |
| WebRtcAudioUtils.logAudioState(TAG, context, audioManager); |
| if (errorCallback != null) { |
| errorCallback.onWebRtcAudioRecordInitError(errorMessage); |
| } |
| } |
| |
| private void reportWebRtcAudioRecordStartError( |
| AudioRecordStartErrorCode errorCode, String errorMessage) { |
| Logging.e(TAG, "Start recording error: " + errorCode + ". " + errorMessage); |
| WebRtcAudioUtils.logAudioState(TAG, context, audioManager); |
| if (errorCallback != null) { |
| errorCallback.onWebRtcAudioRecordStartError(errorCode, errorMessage); |
| } |
| } |
| |
| private void reportWebRtcAudioRecordError(String errorMessage) { |
| Logging.e(TAG, "Run-time recording error: " + errorMessage); |
| WebRtcAudioUtils.logAudioState(TAG, context, audioManager); |
| if (errorCallback != null) { |
| errorCallback.onWebRtcAudioRecordError(errorMessage); |
| } |
| } |
| } |