android官方文档
一般使用流程 1 2 3 4 5 6 7 8 9 10 11 MediaRecorder recorder = new MediaRecorder(); recorder.setAudioSource(MediaRecorder.AudioSource.MIC); recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); recorder.setOutputFile(PATH_NAME); recorder.prepare(); recorder.start(); // 录制已经开始了 ... recorder.stop(); recorder.reset(); // 重置，这时可以重新设置AudioSource recorder.release(); // 释放资源 流程状态图 常见内部类或接口 AudioSource 可选音频源 DEFAULT 默认音频源 MIC 麦克风 VOICE_CALL 打电话 CAMCORDER 相机录像时的音频源 VOICE_COMMUNICATION 语音通话，VoIP，带音频去回声，增益 VideoSource 可选视频源 DEFAULT 系统预设默认 CAMERA 从相机获取视频 SURFACE 从surface中获取 OutputFormat 输出格式 DEFAULT 系统预设默认 THREE_GPP 3GP，视频 MEPG_4 mp4，视频 RAW_AMR AMR_NB AMR_WB AAC_ADIF AAC_ADTS OUTPUT_FORMAT_RTP_AVP MPEG_2_TS WEBM HEIF OGG AudioEncoder 可选音频编码常量 DEFAULT AMR_NB AMR_WB AAC HE_AAC AAC_ELD VORBIS OPUS VideoEncoder 可选视频编码常量 DEFAULT H263 H264 MPEG_4_SP VP8 HEVC(H265) VP9 DOLBY_VISION AV1 OnErrorListener 错误回调接口 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 /* * 未指定的MediaRecorder错误 */ public static final int MEDIA_RECORDER_ERROR_UNKNOWN=1; /** * 媒体服务器死亡。在这种情况下，应用程序必须释放MediaRecorder对象并实例化一个新对象 */ public static final int MEDIA_ERROR_SERVER_DIED = 100; public interface OnErrorListener { /** * 在录制时发生错误的时候调用 * * @param mr 遇到错误的MediaRecorder对象 * @param what 错误类型 * <ul> * <li>{@link #MEDIA_RECORDER_ERROR_UNKNOWN} * <li>{@link #MEDIA_ERROR_SERVER_DIED} * </ul> * @param extra 特定错误类型的错误代码 */ void onError(MediaRecorder mr, int what, int extra); } OnInfoListener 录制信息回调接口 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 //未指定的信息类型 public static final int MEDIA_RECORDER_INFO_UNKNOWN = 1; //达到最大录制时间提示 public static final int MEDIA_RECORDER_INFO_MAX_DURATION_REACHED = 800; //达到最大录制文件大小提示 public static final int MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED = 801; public interface OnInfoListener { /** * 录制过程中提示或警告回调该接口 * * @param mr 触发提示或警告的MediaRecorder * @param what 发生的提示或警告类型 * <ul> * <li>{@link #MEDIA_RECORDER_INFO_UNKNOWN} * <li>{@link #MEDIA_RECORDER_INFO_MAX_DURATION_REACHED} * <li>{@link #MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED} * </ul> * @param extra 特定提示或警告类型的代码 */ void onInfo(MediaRecorder mr, int what, int extra); } 常见方法 视频相关 getSurface():Surface 1 2 3 4 5 6 7 8 9 /** * 获取在使用surface视频源时的surface * * 只能在prepare方法之后调用. 在调用start方法之前surface中渲染的帧数据将被丢弃 * * @throws IllegalStateException 在调用prepare方法之前，stop方法之后，或者未设置surface视频源调用该方法抛出该异常 * @see android.media.MediaRecorder.VideoSource */ public native Surface getSurface(); setInputSurface(Surface):void 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 /** * 当配置使用SURFACE视频源时，这个方法为录制器设置一个持续更新的surface * 只能在prepare方法之前调用 * @param surface a persistent input surface created by * {@link MediaCodec#createPersistentInputSurface} * @throws IllegalStateException if it is called after {@link #prepare} and before * {@link #stop}. * @throws IllegalArgumentException if the surface was not created by * {@link MediaCodec#createPersistentInputSurface}. * @see MediaCodec#createPersistentInputSurface * @see MediaRecorder.VideoSource */ public void setInputSurface(@NonNull Surface surface) { if (!(surface instanceof MediaCodec.PersistentSurface)) { throw new IllegalArgumentException("not a PersistentSurface"); } native_setInputSurface(surface); } setPreviewDisplay(Surface):void 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 /** * 设置一个surface用来显示当前录制中的视频。需要在prepare方法之前调用 * Sets a Surface to show a preview of recorded media (video). Calls this * before prepare() to make sure that the desirable preview display is * set. If {@link #setCamera(Camera)} is used and the surface has been * already set to the camera, application do not need to call this. If * this is called with non-null surface, the preview surface of the camera * will be replaced by the new surface. If this method is called with null * surface or not called at all, media recorder will not change the preview * surface of the camera. * * @param sv the Surface to use for the preview * @see android.hardware.Camera#setPreviewDisplay(android.view.SurfaceHolder) */ public void setPreviewDisplay(Surface sv) { mSurface = sv; } isSystemOnlyAudioSource(int):boolean 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 // TODO make AudioSource static (API change) and move this method inside the AudioSource class /** * @hide * @param source An audio source to test * @return true if the source is only visible to system components */ public static boolean isSystemOnlyAudioSource(int source) { switch(source) { case AudioSource.DEFAULT: case AudioSource.MIC: case AudioSource.VOICE_UPLINK: case AudioSource.VOICE_DOWNLINK: case AudioSource.VOICE_CALL: case AudioSource.CAMCORDER: case AudioSource.VOICE_RECOGNITION: case AudioSource.VOICE_COMMUNICATION: //case REMOTE_SUBMIX: considered "system" as it requires system permissions case AudioSource.UNPROCESSED: case AudioSource.VOICE_PERFORMANCE: return false; default: return true; } } isValidAudioSource(int):boolean 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 /** * @hide * @param source An audio source to test * @return true if the source is a valid one */ public static boolean isValidAudioSource(int source) { switch(source) { case AudioSource.MIC: case AudioSource.VOICE_UPLINK: case AudioSource.VOICE_DOWNLINK: case AudioSource.VOICE_CALL: case AudioSource.CAMCORDER: case AudioSource.VOICE_RECOGNITION: case AudioSource.VOICE_COMMUNICATION: case AudioSource.REMOTE_SUBMIX: case AudioSource.UNPROCESSED: case AudioSource.VOICE_PERFORMANCE: case AudioSource.ECHO_REFERENCE: case AudioSource.RADIO_TUNER: case AudioSource.HOTWORD: case AudioSource.ULTRASOUND: return true; default: return false; } } setVideoSource(int):void 1 2 3 4 5 6 7 8 9 10 11 12 /** * Sets the video source to be used for recording. If this method is not * called, the output file will not contain an video track. The source needs * to be specified before setting recording-parameters or encoders. Call * this only before setOutputFormat(). * * @param video_source the video source to use * @throws IllegalStateException if it is called after setOutputFormat() * @see android.media.MediaRecorder.VideoSource */ public native void setVideoSource(int video_source) throws IllegalStateException; setProfile(CamcorderProfile):void 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 /** * Uses the settings from a CamcorderProfile object for recording. This method should * be called after the video AND audio sources are set, and before setOutputFile(). * If a time lapse CamcorderProfile is used, audio related source or recording * parameters are ignored. * * @param profile the CamcorderProfile to use * @see android.media.CamcorderProfile */ public void setProfile(CamcorderProfile profile) { setOutputFormat(profile.fileFormat); setVideoFrameRate(profile.videoFrameRate); setVideoSize(profile.videoFrameWidth, profile.videoFrameHeight); setVideoEncodingBitRate(profile.videoBitRate); setVideoEncoder(profile.videoCodec); if (profile.quality >= CamcorderProfile.QUALITY_TIME_LAPSE_LOW && profile.quality <= CamcorderProfile.QUALITY_TIME_LAPSE_QVGA) { // Nothing needs to be done. Call to setCaptureRate() enables // time lapse video recording. } else { setAudioEncodingBitRate(profile.audioBitRate); setAudioChannels(profile.audioChannels); setAudioSamplingRate(profile.audioSampleRate); setAudioEncoder(profile.audioCodec); } } setVideoProfile(VideoProfile):void 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 /** * Uses the settings from a VideoProfile object for recording. * <p> * This method should be called after the video AND audio sources are set, and before * setOutputFile(). * <p> * This method can be used instead of {@link #setProfile} when using EncoderProfiles. * * @param profile the VideoProfile to use * @see android.media.EncoderProfiles * @see android.media.CamcorderProfile#getAll */ public void setVideoProfile(@NonNull EncoderProfiles.VideoProfile profile) { setVideoFrameRate(profile.getFrameRate()); setVideoSize(profile.getWidth(), profile.getHeight()); setVideoEncodingBitRate(profile.getBitrate()); setVideoEncoder(profile.getCodec()); if (profile.getProfile() >= 0) { setVideoEncodingProfileLevel(profile.getProfile(), 0 /* level */); } } setCaptureRate(double):void 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 /** * Set video frame capture rate. This can be used to set a different video frame capture * rate than the recorded video's playback rate. This method also sets the recording mode * to time lapse. In time lapse video recording, only video is recorded. Audio related * parameters are ignored when a time lapse recording session starts, if an application * sets them. * * @param fps Rate at which frames should be captured in frames per second. * The fps can go as low as desired. However the fastest fps will be limited by the hardware. * For resolutions that can be captured by the video camera, the fastest fps can be computed using * {@link android.hardware.Camera.Parameters#getPreviewFpsRange(int[])}. For higher * resolutions the fastest fps may be more restrictive. * Note that the recorder cannot guarantee that frames will be captured at the * given rate due to camera/encoder limitations. However it tries to be as close as * possible. */ public void setCaptureRate(double fps) { // Make sure that time lapse is enabled when this method is called. setParameter("time-lapse-enable=1"); setParameter("time-lapse-fps=" + fps); } setOrientationHint(int):void 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 /** * Sets the orientation hint for output video playback. * This method should be called before prepare(). This method will not * trigger the source video frame to rotate during video recording, but to * add a composition matrix containing the rotation angle in the output * video if the output format is OutputFormat.THREE_GPP or * OutputFormat.MPEG_4 so that a video player can choose the proper * orientation for playback. Note that some video players may choose * to ignore the compostion matrix in a video during playback. * * @param degrees the angle to be rotated clockwise in degrees. * The supported angles are 0, 90, 180, and 270 degrees. * @throws IllegalArgumentException if the angle is not supported. * */ public void setOrientationHint(int degrees) { if (degrees != 0 && degrees != 90 && degrees != 180 && degrees != 270) { throw new IllegalArgumentException("Unsupported angle: " + degrees); } setParameter("video-param-rotation-angle-degrees=" + degrees); } setVideoSize(int,int):void 1 2 3 4 5 6 7 8 9 10 11 12 /** * Sets the width and height of the video to be captured. Must be called * after setVideoSource(). Call this after setOutputFormat() but before * prepare(). * * @param width the width of the video to be captured * @param height the height of the video to be captured * @throws IllegalStateException if it is called after * prepare() or before setOutputFormat() */ public native void setVideoSize(int width, int height) throws IllegalStateException; setVideoFrameRate(int):void 1 2 3 4 5 6 7 8 9 10 11 12 13 14 /** * Sets the frame rate of the video to be captured. Must be called * after setVideoSource(). Call this after setOutputFormat() but before * prepare(). * * @param rate the number of frames per second of video to capture * @throws IllegalStateException if it is called after * prepare() or before setOutputFormat(). * * NOTE: On some devices that have auto-frame rate, this sets the * maximum frame rate, not a constant frame rate. Actual frame rate * will vary according to lighting conditions. */ public native void setVideoFrameRate(int rate) throws IllegalStateException; setVideoEncoder(int):void 1 2 3 4 5 6 7 8 9 10 11 12 /** * Sets the video encoder to be used for recording. If this method is not * called, the output file will not contain an video track. Call this after * setOutputFormat() and before prepare(). * * @param video_encoder the video encoder to use. * @throws IllegalStateException if it is called before * setOutputFormat() or after prepare() * @see android.media.MediaRecorder.VideoEncoder */ public native void setVideoEncoder(@VideoEncoderValues int video_encoder) throws IllegalStateException; setVideoEncodingBitRate(int):void 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 /** * Sets the video encoding bit rate for recording. Call this method before prepare(). * Prepare() may perform additional checks on the parameter to make sure whether the * specified bit rate is applicable, and sometimes the passed bitRate will be * clipped internally to ensure the video recording can proceed smoothly based on * the capabilities of the platform. * * <p> * NB: the actual bitrate and other encoding characteristics may be affected by * the minimum quality floor behavior introduced in * {@link android.os.Build.VERSION_CODES#S}. More detail on how and where this * impacts video encoding can be found in the * {@link MediaCodec} page and looking for "quality floor" (near the top of the page). * * @param bitRate the video encoding bit rate in bits per second. */ public void setVideoEncodingBitRate(int bitRate) { if (bitRate <= 0) { throw new IllegalArgumentException("Video encoding bit rate is not positive"); } setParameter("video-param-encoding-bitrate=" + bitRate); } setVideoEncodingProfileLevel(int,int):void 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 /** * Sets the desired video encoding profile and level for recording. The profile and level * must be valid for the video encoder set by {@link #setVideoEncoder}. This method can * called before or after {@link #setVideoEncoder} but it must be called before {@link #prepare}. * {@code prepare()} may perform additional checks on the parameter to make sure that the specified * profile and level are applicable, and sometimes the passed profile or level will be * discarded due to codec capablity or to ensure the video recording can proceed smoothly * based on the capabilities of the platform. <br>Application can also use the * {@link MediaCodecInfo.CodecCapabilities#profileLevels} to query applicable combination of profile * and level for the corresponding format. Note that the requested profile/level may not be supported by * the codec that is actually being used by this MediaRecorder instance. * @param profile declared in {@link MediaCodecInfo.CodecProfileLevel}. * @param level declared in {@link MediaCodecInfo.CodecProfileLevel}. * @throws IllegalArgumentException when an invalid profile or level value is used. */ public void setVideoEncodingProfileLevel(int profile, int level) { if (profile < 0) { throw new IllegalArgumentException("Video encoding profile is not positive"); } if (level < 0) { throw new IllegalArgumentException("Video encoding level is not positive"); } setParameter("video-param-encoder-profile=" + profile); setParameter("video-param-encoder-level=" + level); } 音频相关 setAudioSource(int):void 1 2 3 4 5 6 7 8 9 10 11 12 /** * Sets the audio source to be used for recording. If this method is not * called, the output file will not contain an audio track. The source needs * to be specified before setting recording-parameters or encoders. Call * this only before setOutputFormat(). * * @param audioSource the audio source to use * @throws IllegalStateException if it is called after setOutputFormat() * @see android.media.MediaRecorder.AudioSource */ public native void setAudioSource(@Source int audioSource) throws IllegalStateException; getAudioSourceMax():int 1 2 3 4 5 6 7 /** * Gets the maximum value for audio sources. * @see android.media.MediaRecorder.AudioSource */ public static final int getAudioSourceMax() { return AudioSource.VOICE_PERFORMANCE; } setAudioProfile(AudioProfile):void 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 /** * Uses the settings from an AudioProfile for recording. * <p> * This method should be called after the video AND audio sources are set, and before * setOutputFile(). * <p> * This method can be used instead of {@link #setProfile} when using EncoderProfiles. * * @param profile the AudioProfile to use * @see android.media.EncoderProfiles * @see android.media.CamcorderProfile#getAll */ public void setAudioProfile(@NonNull EncoderProfiles.AudioProfile profile) { setAudioEncodingBitRate(profile.getBitrate()); setAudioChannels(profile.getChannels()); setAudioSamplingRate(profile.getSampleRate()); setAudioEncoder(profile.getCodec()); } setAudioEncoder(int):void 1 2 3 4 5 6 7 8 9 10 11 12 /** * Sets the audio encoder to be used for recording. If this method is not * called, the output file will not contain an audio track. Call this after * setOutputFormat() but before prepare(). * * @param audio_encoder the audio encoder to use. * @throws IllegalStateException if it is called before * setOutputFormat() or after prepare(). * @see android.media.MediaRecorder.AudioEncoder */ public native void setAudioEncoder(@AudioEncoderValues int audio_encoder) throws IllegalStateException; setAudioSamplingRate(int):void 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 /** * Sets the audio sampling rate for recording. Call this method before prepare(). * Prepare() may perform additional checks on the parameter to make sure whether * the specified audio sampling rate is applicable. The sampling rate really depends * on the format for the audio recording, as well as the capabilities of the platform. * For instance, the sampling rate supported by AAC audio coding standard ranges * from 8 to 96 kHz, the sampling rate supported by AMRNB is 8kHz, and the sampling * rate supported by AMRWB is 16kHz. Please consult with the related audio coding * standard for the supported audio sampling rate. * * @param samplingRate the sampling rate for audio in samples per second. */ public void setAudioSamplingRate(int samplingRate) { if (samplingRate <= 0) { throw new IllegalArgumentException("Audio sampling rate is not positive"); } setParameter("audio-param-sampling-rate=" + samplingRate); } setAudioChannels(int):void 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 /** * Sets the number of audio channels for recording. Call this method before prepare(). * Prepare() may perform additional checks on the parameter to make sure whether the * specified number of audio channels are applicable. * * @param numChannels the number of audio channels. Usually it is either 1 (mono) or 2 * (stereo). */ public void setAudioChannels(int numChannels) { if (numChannels <= 0) { throw new IllegalArgumentException("Number of channels is not positive"); } mChannelCount = numChannels; setParameter("audio-param-number-of-channels=" + numChannels); } setAudioEncodingBitRate(int):void 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 /** * Sets the audio encoding bit rate for recording. Call this method before prepare(). * Prepare() may perform additional checks on the parameter to make sure whether the * specified bit rate is applicable, and sometimes the passed bitRate will be clipped * internally to ensure the audio recording can proceed smoothly based on the * capabilities of the platform. * * @param bitRate the audio encoding bit rate in bits per second. */ public void setAudioEncodingBitRate(int bitRate) { if (bitRate <= 0) { throw new IllegalArgumentException("Audio encoding bit rate is not positive"); } setParameter("audio-param-encoding-bitrate=" + bitRate); } setPreferredDevice(AudioDeviceInfo):boolean [AudioRouting] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 /** * Specifies an audio device (via an {@link AudioDeviceInfo} object) to route * the input from this MediaRecorder. * @param deviceInfo The {@link AudioDeviceInfo} specifying the audio source. * If deviceInfo is null, default routing is restored. * @return true if succesful, false if the specified {@link AudioDeviceInfo} is non-null and * does not correspond to a valid audio input device. */ @Override public boolean setPreferredDevice(AudioDeviceInfo deviceInfo) { if (deviceInfo != null && !deviceInfo.isSource()) { return false; } int preferredDeviceId = deviceInfo != null ? deviceInfo.getId() : 0; boolean status = native_setInputDevice(preferredDeviceId); if (status == true) { synchronized (this) { mPreferredDevice = deviceInfo; } } return status; } getPreferredDevice():AudioDeviceInfo [AudioRouting] 1 2 3 4 5 6 7 8 9 10 /** * Returns the selected input device specified by {@link #setPreferredDevice}. Note that this * is not guaranteed to correspond to the actual device being used for recording. */ @Override public AudioDeviceInfo getPreferredDevice() { synchronized (this) { return mPreferredDevice; } } getRoutedDevice():AudioDeviceInfo [AudioRouting] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 /** * Returns an {@link AudioDeviceInfo} identifying the current routing of this MediaRecorder * Note: The query is only valid if the MediaRecorder is currently recording. * If the recorder is not recording, the returned device can be null or correspond to previously * selected device when the recorder was last active. */ @Override public AudioDeviceInfo getRoutedDevice() { int deviceId = native_getRoutedDeviceId(); if (deviceId == 0) { return null; } return AudioManager.getDeviceForPortId(deviceId, AudioManager.GET_DEVICES_INPUTS); } add/removeOnRoutingChangedListener(OnRoutingChangedListener):void [AudioRouting] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 /** * Adds an {@link AudioRouting.OnRoutingChangedListener} to receive notifications of routing * changes on this MediaRecorder. * @param listener The {@link AudioRouting.OnRoutingChangedListener} interface to receive * notifications of rerouting events. * @param handler Specifies the {@link Handler} object for the thread on which to execute * the callback. If <code>null</code>, the handler on the main looper will be used. */ @Override public void addOnRoutingChangedListener(AudioRouting.OnRoutingChangedListener listener, Handler handler) { synchronized (mRoutingChangeListeners) { if (listener != null && !mRoutingChangeListeners.containsKey(listener)) { enableNativeRoutingCallbacksLocked(true); mRoutingChangeListeners.put( listener, new NativeRoutingEventHandlerDelegate(this, listener, handler != null ? handler : mEventHandler)); } } } /** * Removes an {@link AudioRouting.OnRoutingChangedListener} which has been previously added * to receive rerouting notifications. * @param listener The previously added {@link AudioRouting.OnRoutingChangedListener} interface * to remove. */ @Override public void removeOnRoutingChangedListener(AudioRouting.OnRoutingChangedListener listener) { synchronized (mRoutingChangeListeners) { if (mRoutingChangeListeners.containsKey(listener)) { mRoutingChangeListeners.remove(listener); enableNativeRoutingCallbacksLocked(false); } } } getActiveMicrophones():List 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 //-------------------------------------------------------------------------- // Microphone information //-------------------- /** * Return A lists of {@link MicrophoneInfo} representing the active microphones. * By querying channel mapping for each active microphone, developer can know how * the microphone is used by each channels or a capture stream. * * @return a lists of {@link MicrophoneInfo} representing the active microphones * @throws IOException if an error occurs */ public List<MicrophoneInfo> getActiveMicrophones() throws IOException { ArrayList<MicrophoneInfo> activeMicrophones = new ArrayList<>(); int status = native_getActiveMicrophones(activeMicrophones); if (status != AudioManager.SUCCESS) { if (status != AudioManager.ERROR_INVALID_OPERATION) { Log.e(TAG, "getActiveMicrophones failed:" + status); } Log.i(TAG, "getActiveMicrophones failed, fallback on routed device info"); } AudioManager.setPortIdForMicrophones(activeMicrophones); // Use routed device when there is not information returned by hal. if (activeMicrophones.size() == 0) { AudioDeviceInfo device = getRoutedDevice(); if (device != null) { MicrophoneInfo microphone = AudioManager.microphoneInfoFromAudioDeviceInfo(device); ArrayList<Pair<Integer, Integer>> channelMapping = new ArrayList<>(); for (int i = 0; i < mChannelCount; i++) { channelMapping.add(new Pair(i, MicrophoneInfo.CHANNEL_MAPPING_DIRECT)); } microphone.setChannelMapping(channelMapping); activeMicrophones.add(microphone); } } return activeMicrophones; } setPreferredMicrophoneDirection(int):boolean [MicrophoneDirection] 1 2 3 4 5 6 7 8 9 10 11 12 //-------------------------------------------------------------------------- // MicrophoneDirection //-------------------- /** * Specifies the logical microphone (for processing). * * @param direction Direction constant. * @return true if sucessful. */ public boolean setPreferredMicrophoneDirection(@DirectionMode int direction) { return native_setPreferredMicrophoneDirection(direction) == 0; } setPreferredMicrophoneFieldDimension(float):boolean [MicrophoneDirection] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 /** * Specifies the zoom factor (i.e. the field dimension) for the selected microphone * (for processing). The selected microphone is determined by the use-case for the stream. * * @param zoom the desired field dimension of microphone capture. Range is from -1 (wide angle), * though 0 (no zoom) to 1 (maximum zoom). * @return true if sucessful. */ public boolean setPreferredMicrophoneFieldDimension( @FloatRange(from = -1.0, to = 1.0) float zoom) { Preconditions.checkArgument( zoom >= -1 && zoom <= 1, "Argument must fall between -1 & 1 (inclusive)"); return native_setPreferredMicrophoneFieldDimension(zoom) == 0; } register/unregisterAudioRecordingCallback([Executor],AudioRecordingCallback):void [AudioRecordingMonitor] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 /** * Register a callback to be notified of audio capture changes via a * {@link AudioManager.AudioRecordingCallback}. A callback is received when the capture path * configuration changes (pre-processing, format, sampling rate...) or capture is * silenced/unsilenced by the system. * @param executor {@link Executor} to handle the callbacks. * @param cb non-null callback to register */ public void registerAudioRecordingCallback(@NonNull @CallbackExecutor Executor executor, @NonNull AudioManager.AudioRecordingCallback cb) { mRecordingInfoImpl.registerAudioRecordingCallback(executor, cb); } /** * Unregister an audio recording callback previously registered with * {@link #registerAudioRecordingCallback(Executor, AudioManager.AudioRecordingCallback)}. * @param cb non-null callback to unregister */ public void unregisterAudioRecordingCallback(@NonNull AudioManager.AudioRecordingCallback cb) { mRecordingInfoImpl.unregisterAudioRecordingCallback(cb); } getActiveRecordingConfiguration():AudioRecordingConfiguration [AudioRecordingMonitor] 1 2 3 4 5 6 7 8 9 /** * Returns the current active audio recording for this audio recorder. * @return a valid {@link AudioRecordingConfiguration} if this recorder is active * or null otherwise. * @see AudioRecordingConfiguration */ public @Nullable AudioRecordingConfiguration getActiveRecordingConfiguration() { return mRecordingInfoImpl.getActiveRecordingConfiguration(); } 其他 setPrivacySensitive(boolean):void 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 /** * Indicates that this capture request is privacy sensitive and that * any concurrent capture is not permitted. * <p> * The default is not privacy sensitive except when the audio source set with * {@link #setAudioSource(int)} is {@link AudioSource#VOICE_COMMUNICATION} or * {@link AudioSource#CAMCORDER}. * <p> * Always takes precedence over default from audio source when set explicitly. * <p> * Using this API is only permitted when the audio source is one of: * <ul> * <li>{@link AudioSource#MIC}</li> * <li>{@link AudioSource#CAMCORDER}</li> * <li>{@link AudioSource#VOICE_RECOGNITION}</li> * <li>{@link AudioSource#VOICE_COMMUNICATION}</li> * <li>{@link AudioSource#UNPROCESSED}</li> * <li>{@link AudioSource#VOICE_PERFORMANCE}</li> * </ul> * Invoking {@link #prepare()} will throw an IOException if this * condition is not met. * <p> * Must be called after {@link #setAudioSource(int)} and before {@link #setOutputFormat(int)}. * @param privacySensitive True if capture from this MediaRecorder must be marked as privacy * sensitive, false otherwise. * @throws IllegalStateException if called before {@link #setAudioSource(int)} * or after {@link #setOutputFormat(int)} */ public native void setPrivacySensitive(boolean privacySensitive); isPrivacySensitive():boolean 1 2 3 4 5 6 7 8 9 /** * Returns whether this MediaRecorder is marked as privacy sensitive or not with * regard to audio capture. * <p> * See {@link #setPrivacySensitive(boolean)} * <p> * @return true if privacy sensitive, false otherwise */ public native boolean isPrivacySensitive(); setLocation(float,float):void 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 /** * Set and store the geodata (latitude and longitude) in the output file. * This method should be called before prepare(). The geodata is * stored in udta box if the output format is OutputFormat.THREE_GPP * or OutputFormat.MPEG_4, and is ignored for other output formats. * The geodata is stored according to ISO-6709 standard. * * @param latitude latitude in degrees. Its value must be in the * range [-90, 90]. * @param longitude longitude in degrees. Its value must be in the * range [-180, 180]. * * @throws IllegalArgumentException if the given latitude or * longitude is out of range. * */ public void setLocation(float latitude, float longitude) { int latitudex10000 = (int) (latitude * 10000 + 0.5); int longitudex10000 = (int) (longitude * 10000 + 0.5); if (latitudex10000 > 900000 || latitudex10000 < -900000) { String msg = "Latitude: " + latitude + " out of range."; throw new IllegalArgumentException(msg); } if (longitudex10000 > 1800000 || longitudex10000 < -1800000) { String msg = "Longitude: " + longitude + " out of range"; throw new IllegalArgumentException(msg); } setParameter("param-geotag-latitude=" + latitudex10000); setParameter("param-geotag-longitude=" + longitudex10000); } setOutputFormat(int):void 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 /** * Sets the format of the output file produced during recording. Call this * after setAudioSource()/setVideoSource() but before prepare(). * * <p>It is recommended to always use 3GP format when using the H.263 * video encoder and AMR audio encoder. Using an MPEG-4 container format * may confuse some desktop players.</p> * * @param output_format the output format to use. The output format * needs to be specified before setting recording-parameters or encoders. * @throws IllegalStateException if it is called after prepare() or before * setAudioSource()/setVideoSource(). * @see android.media.MediaRecorder.OutputFormat */ public native void setOutputFormat(@OutputFormatValues int output_format) throws IllegalStateException; setMaxDuration(int):void 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 /** * Sets the maximum duration (in ms) of the recording session. * Call this after setOutputFormat() but before prepare(). * After recording reaches the specified duration, a notification * will be sent to the {@link android.media.MediaRecorder.OnInfoListener} * with a "what" code of {@link #MEDIA_RECORDER_INFO_MAX_DURATION_REACHED} * and recording will be stopped. Stopping happens asynchronously, there * is no guarantee that the recorder will have stopped by the time the * listener is notified. * * <p>When using MPEG-4 container ({@link #setOutputFormat(int)} with * {@link OutputFormat#MPEG_4}), it is recommended to set maximum duration that fits the use * case. Setting a larger than required duration may result in a larger than needed output file * because of space reserved for MOOV box expecting large movie data in this recording session. * Unused space of MOOV box is turned into FREE box in the output file.</p> * * @param max_duration_ms the maximum duration in ms (if zero or negative, disables the duration limit) * */ public native void setMaxDuration(int max_duration_ms) throws IllegalArgumentException; setMaxFileSize(long):void 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 /** * Sets the maximum filesize (in bytes) of the recording session. * Call this after setOutputFormat() but before prepare(). * After recording reaches the specified filesize, a notification * will be sent to the {@link android.media.MediaRecorder.OnInfoListener} * with a "what" code of {@link #MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED} * and recording will be stopped. Stopping happens asynchronously, there * is no guarantee that the recorder will have stopped by the time the * listener is notified. * * <p>When using MPEG-4 container ({@link #setOutputFormat(int)} with * {@link OutputFormat#MPEG_4}), it is recommended to set maximum filesize that fits the use * case. Setting a larger than required filesize may result in a larger than needed output file * because of space reserved for MOOV box expecting large movie data in this recording session. * Unused space of MOOV box is turned into FREE box in the output file.</p> * * @param max_filesize_bytes the maximum filesize in bytes (if zero or negative, disables the limit) * */ public native void setMaxFileSize(long max_filesize_bytes) throws IllegalArgumentException; setOutputFile(FileDescriptor/FIle):void 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 /** * Pass in the file descriptor of the file to be written. Call this after * setOutputFormat() but before prepare(). * * @param fd an open file descriptor to be written into. * @throws IllegalStateException if it is called before * setOutputFormat() or after prepare() */ public void setOutputFile(FileDescriptor fd) throws IllegalStateException { mPath = null; mFile = null; mFd = fd; } /** * Pass in the file object to be written. Call this after setOutputFormat() but before prepare(). * File should be seekable. After setting the next output file, application should not use the * file until {@link #stop}. Application is responsible for cleaning up unused files after * {@link #stop} is called. * * @param file the file object to be written into. */ public void setOutputFile(File file) { mPath = null; mFd = null; mFile = file; } setNextOutputFile(File):void 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 /** * Sets the next output file descriptor to be used when the maximum filesize is reached * on the prior output {@link #setOutputFile} or {@link #setNextOutputFile}). File descriptor * must be seekable and writable. After setting the next output file, application should not * use the file referenced by this file descriptor until {@link #stop}. It is the application's * responsibility to close the file descriptor. It is safe to do so as soon as this call returns. * Application must call this after receiving on the * {@link android.media.MediaRecorder.OnInfoListener} a "what" code of * {@link #MEDIA_RECORDER_INFO_MAX_FILESIZE_APPROACHING} and before receiving a "what" code of * {@link #MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED}. The file is not used until switching to * that output. Application will receive{@link #MEDIA_RECORDER_INFO_NEXT_OUTPUT_FILE_STARTED} * when the next output file is used. Application will not be able to set a new output file if * the previous one has not been used. Application is responsible for cleaning up unused files * after {@link #stop} is called. * * @param fd an open file descriptor to be written into. * @throws IllegalStateException if it is called before prepare(). * @throws IOException if setNextOutputFile fails otherwise. */ public void setNextOutputFile(FileDescriptor fd) throws IOException { _setNextOutputFile(fd); } prepare():void 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 /** * Prepares the recorder to begin capturing and encoding data. This method * must be called after setting up the desired audio and video sources, * encoders, file format, etc., but before start(). * * @throws IllegalStateException if it is called after * start() or before setOutputFormat(). * @throws IOException if prepare fails otherwise. */ public void prepare() throws IllegalStateException, IOException { if (mPath != null) { RandomAccessFile file = new RandomAccessFile(mPath, "rw"); try { _setOutputFile(file.getFD()); } finally { file.close(); } } else if (mFd != null) { _setOutputFile(mFd); } else if (mFile != null) { RandomAccessFile file = new RandomAccessFile(mFile, "rw"); try { _setOutputFile(file.getFD()); } finally { file.close(); } } else { throw new IOException("No valid output file"); } _prepare(); } start():void 1 2 3 4 5 6 7 8 9 10 11 12 13 14 /** * Begins capturing and encoding data to the file specified with * setOutputFile(). Call this after prepare(). * * <p>Since API level 13, if applications set a camera via * {@link #setCamera(Camera)}, the apps can use the camera after this method * call. The apps do not need to lock the camera again. However, if this * method fails, the apps should still lock the camera back. The apps should * not start another recording session during recording. * * @throws IllegalStateException if it is called before * prepare() or when the camera is already in use by another app. */ public native void start() throws IllegalStateException; stop():void 1 2 3 4 5 6 7 8 9 10 11 12 13 /** * Stops recording. Call this after start(). Once recording is stopped, * you will have to configure it again as if it has just been constructed. * Note that a RuntimeException is intentionally thrown to the * application, if no valid audio/video data has been received when stop() * is called. This happens if stop() is called immediately after * start(). The failure lets the application take action accordingly to * clean up the output file (delete the output file, for instance), since * the output file is not properly constructed when this happens. * * @throws IllegalStateException if it is called before start() */ public native void stop() throws IllegalStateException; pause():void 1 2 3 4 5 6 7 8 9 10 11 12 13 /** * Pauses recording. Call this after start(). You may resume recording * with resume() without reconfiguration, as opposed to stop(). It does * nothing if the recording is already paused. * * When the recording is paused and resumed, the resulting output would * be as if nothing happend during paused period, immediately switching * to the resumed scene. * * @throws IllegalStateException if it is called before start() or after * stop() */ public native void pause() throws IllegalStateException; resume():void 1 2 3 4 5 6 7 8 9 /** * Resumes recording. Call this after start(). It does nothing if the * recording is not paused. * * @throws IllegalStateException if it is called before start() or after * stop() * @see android.media.MediaRecorder#pause */ public native void resume() throws IllegalStateException; reset():void 1 2 3 4 5 6 7 8 9 10 11 /** * Restarts the MediaRecorder to its idle state. After calling * this method, you will have to configure it again as if it had just been * constructed. */ public void reset() { native_reset(); // make sure none of the listeners get called anymore mEventHandler.removeCallbacksAndMessages(null); } getMaxAmplitude():int 1 2 3 4 5 6 7 8 9 10 /** * Returns the maximum absolute amplitude that was sampled since the last * call to this method. Call this only after the setAudioSource(). * * @return the maximum absolute amplitude measured since the last call, or * 0 when called for the first time * @throws IllegalStateException if it is called before * the audio source has been set. */ public native int getMaxAmplitude() throws IllegalStateException; setOnErrorListener(OnErrorListener):void 1 2 3 4 5 6 7 8 9 10 /** * Register a callback to be invoked when an error occurs while * recording. * * @param l the callback that will be run */ public void setOnErrorListener(OnErrorListener l) { mOnErrorListener = l; } setOnInfoListener(OnInfoListener):void 1 2 3 4 5 6 7 8 9 10 /** * Register a callback to be invoked when an informational event occurs while * recording. * * @param listener the callback that will be run */ public void setOnInfoListener(OnInfoListener listener) { mOnInfoListener = listener; } getPortedId():int 1 2 3 4 5 6 7 8 9 10 11 12 //--------------------------------------------------------- // Implementation of AudioRecordingMonitorClient interface //-------------------- /** * @hide */ public int getPortId() { if (mNativeContext == 0) { return 0; } return native_getPortId(); } release():void 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 /** * Releases resources associated with this MediaRecorder object. * It is good practice to call this method when you're done * using the MediaRecorder. In particular, whenever an Activity * of an application is paused (its onPause() method is called), * or stopped (its onStop() method is called), this method should be * invoked to release the MediaRecorder object, unless the application * has a special need to keep the object around. In addition to * unnecessary resources (such as memory and instances of codecs) * being held, failure to call this method immediately if a * MediaRecorder object is no longer needed may also lead to * continuous battery consumption for mobile devices, and recording * failure for other applications if no multiple instances of the * same codec are supported on a device. Even if multiple instances * of the same codec are supported, some performance degradation * may be expected when unnecessary multiple instances are used * at the same time. */ public native void release();