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link管理  ›  AudioTrack | Android Developers
audio
https://www.dre.vanderbilt.edu/~schmidt/android/android-4.0/out/target/common/docs/doc-comment-check/reference/android/media/AudioTrack.html
魁梧的硬币
6 月前
  • AudioManager.OnAudioFocusChangeListener
  • AudioRecord.OnRecordPositionUpdateListener
  • AudioTrack.OnPlaybackPositionUpdateListener
  • JetPlayer.OnJetEventListener
  • MediaPlayer.OnBufferingUpdateListener
  • MediaPlayer.OnCompletionListener
  • MediaPlayer.OnErrorListener
  • MediaPlayer.OnInfoListener
  • MediaPlayer.OnPreparedListener
  • MediaPlayer.OnSeekCompleteListener
  • MediaPlayer.OnVideoSizeChangedListener
  • MediaRecorder.OnErrorListener
  • MediaRecorder.OnInfoListener
  • MediaScannerConnection.MediaScannerConnectionClient
  • MediaScannerConnection.OnScanCompletedListener
  • SoundPool.OnLoadCompleteListener

  • Classes

  • AsyncPlayer
  • AudioFormat
  • AudioManager
  • AudioRecord
  • AudioTrack
  • CamcorderProfile
  • CameraProfile
  • ExifInterface
  • FaceDetector
  • FaceDetector.Face
  • JetPlayer
  • MediaMetadataRetriever
  • MediaPlayer
  • MediaRecorder
  • MediaRecorder.AudioEncoder
  • MediaRecorder.AudioSource
  • MediaRecorder.OutputFormat
  • MediaRecorder.VideoEncoder
  • MediaRecorder.VideoSource
  • MediaScannerConnection
  • Ringtone
  • RingtoneManager
  • SoundPool
  • ThumbnailUtils
  • ToneGenerator

    • Class Overview

    The AudioTrack class manages and plays a single audio resource for Java applications. It allows to stream PCM audio buffers to the audio hardware for playback. This is achieved by "pushing" the data to the AudioTrack object using one of the write(byte[], int, int) and write(short[], int, int) methods.

    An AudioTrack instance can operate under two modes: static or streaming.
    In Streaming mode, the application writes a continuous stream of data to the AudioTrack, using one of the write() methods. These are blocking and return when the data has been transferred from the Java layer to the native layer and queued for playback. The streaming mode is most useful when playing blocks of audio data that for instance are:

  • too big to fit in memory because of the duration of the sound to play,
  • too big to fit in memory because of the characteristics of the audio data (high sampling rate, bits per sample ...)
  • received or generated while previously queued audio is playing.
    • The static mode is to be chosen when dealing with short sounds that fit in memory and that need to be played with the smallest latency possible. AudioTrack instances in static mode can play the sound without the need to transfer the audio data from Java to native layer each time the sound is to be played. The static mode will therefore be preferred for UI and game sounds that are played often, and with the smallest overhead possible.

    Upon creation, an AudioTrack object initializes its associated audio buffer. The size of this buffer, specified during the construction, determines how long an AudioTrack can play before running out of data.
    For an AudioTrack using the static mode, this size is the maximum size of the sound that can be played from it.
    For the streaming mode, data will be written to the hardware in chunks of sizes inferior to the total buffer size. interface AudioTrack.OnPlaybackPositionUpdateListener Interface definition for a callback to be invoked when the playback head position of an AudioTrack has reached a notification marker or has increased by a certain period. MODE_STATIC Creation mode where audio data is transferred from Java to the native layer only once before the audio starts playing. STATE_NO_STATIC_DATA State of a successfully initialized AudioTrack that uses static data, but that hasn't received that data yet. AudioTrack (int streamType, int sampleRateInHz, int channelConfig, int audioFormat, int bufferSizeInBytes, int mode)

    Class constructor.
    AudioTrack (int streamType, int sampleRateInHz, int channelConfig, int audioFormat, int bufferSizeInBytes, int mode, int sessionId)
    Class constructor with audio session.
    getMinBufferSize (int sampleRateInHz, int channelConfig, int audioFormat)
    Returns the minimum buffer size required for the successful creation of an AudioTrack object to be created in the MODE_STREAM mode.
    reloadStaticData ()
    Notifies the native resource to reuse the audio data already loaded in the native layer.
    setAuxEffectSendLevel (float level)
    Sets the send level of the audio track to the attached auxiliary effect setPlaybackPositionUpdateListener ( AudioTrack.OnPlaybackPositionUpdateListener listener)
    Sets the listener the AudioTrack notifies when a previously set marker is reached or for each periodic playback head position update.
    setPlaybackPositionUpdateListener ( AudioTrack.OnPlaybackPositionUpdateListener listener, Handler handler)
    Sets the listener the AudioTrack notifies when a previously set marker is reached or for each periodic playback head position update.
    wait (long millis, int nanos)
    Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
    wait (long millis)
    Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
    the type of the audio stream. See STREAM_VOICE_CALL , STREAM_SYSTEM , STREAM_RING , STREAM_MUSIC and STREAM_ALARM sampleRateInHz the sample rate expressed in Hertz. Examples of rates are (but not limited to) 44100, 22050 and 11025. channelConfig describes the configuration of the audio channels. See CHANNEL_OUT_MONO and CHANNEL_OUT_STEREO audioFormat the format in which the audio data is represented. See ENCODING_PCM_16BIT and ENCODING_PCM_8BIT bufferSizeInBytes the total size (in bytes) of the buffer where audio data is read from for playback. If using the AudioTrack in streaming mode, you can write data into this buffer in smaller chunks than this size. If using the AudioTrack in static mode, this is the maximum size of the sound that will be played for this instance. See getMinBufferSize(int, int, int) to determine the minimum required buffer size for the successful creation of an AudioTrack instance in streaming mode. Using values smaller than getMinBufferSize() will result in an initialization failure. streaming or static buffer. See MODE_STATIC and MODE_STREAM

    Class constructor with audio session. Use this constructor when the AudioTrack must be attached to a particular audio session. The primary use of the audio session ID is to associate audio effects to a particular instance of AudioTrack: if an audio session ID is provided when creating an AudioEffect, this effect will be applied only to audio tracks and media players in the same session and not to the output mix. When an AudioTrack is created without specifying a session, it will create its own session which can be retreived by calling the getAudioSessionId() method. If a session ID is provided, this AudioTrack will share effects attached to this session with all other media players or audio tracks in the same session.

    Parameters
    streamType the type of the audio stream. See STREAM_VOICE_CALL , STREAM_SYSTEM , STREAM_RING , STREAM_MUSIC and STREAM_ALARM sampleRateInHz the sample rate expressed in Hertz. Examples of rates are (but not limited to) 44100, 22050 and 11025. channelConfig describes the configuration of the audio channels. See CHANNEL_OUT_MONO and CHANNEL_OUT_STEREO audioFormat the format in which the audio data is represented. See ENCODING_PCM_16BIT and ENCODING_PCM_8BIT bufferSizeInBytes the total size (in bytes) of the buffer where audio data is read from for playback. If using the AudioTrack in streaming mode, you can write data into this buffer in smaller chunks than this size. If using the AudioTrack in static mode, this is the maximum size of the sound that will be played for this instance. See getMinBufferSize(int, int, int) to determine the minimum required buffer size for the successful creation of an AudioTrack instance in streaming mode. Using values smaller than getMinBufferSize() will result in an initialization failure. streaming or static buffer. See MODE_STATIC and MODE_STREAM sessionId Id of audio session the AudioTrack must be attached to

    Attaches an auxiliary effect to the audio track. A typical auxiliary effect is a reverberation effect which can be applied on any sound source that directs a certain amount of its energy to this effect. This amount is defined by setAuxEffectSendLevel().

    After creating an auxiliary effect (e.g. EnvironmentalReverb ), retrieve its ID with getId() and use it when calling this method to attach the audio track to the effect.

    To detach the effect from the audio track, call this method with a null effect id.

    Parameters
    effectId system wide unique id of the effect to attach

    Returns the maximum valid volume value. Volume values set above this one will be clamped at this value.

    Returns
    • the maximum volume expressed as a linear attenuation.

      Returns the minimum buffer size required for the successful creation of an AudioTrack object to be created in the MODE_STREAM mode. Note that this size doesn't guarantee a smooth playback under load, and higher values should be chosen according to the expected frequency at which the buffer will be refilled with additional data to play.

      Parameters
      sampleRateInHz the sample rate expressed in Hertz. channelConfig describes the configuration of the audio channels. See CHANNEL_OUT_MONO and CHANNEL_OUT_STEREO audioFormat the format in which the audio data is represented. See ENCODING_PCM_16BIT and ENCODING_PCM_8BIT
      Returns
      • ERROR_BAD_VALUE if an invalid parameter was passed, or ERROR if the implementation was unable to query the hardware for its output properties, or the minimum buffer size expressed in bytes.

        Returns the minimum valid volume value. Volume values set under this one will be clamped at this value.

        Returns
        • the minimum volume expressed as a linear attenuation.

          Returns the state of the AudioTrack instance. This is useful after the AudioTrack instance has been created to check if it was initialized properly. This ensures that the appropriate hardware resources have been acquired.

          See Also
          • STATE_INITIALIZED
          • STATE_NO_STATIC_DATA
          • STATE_UNINITIALIZED

            • Returns the type of audio stream this AudioTrack is configured for. Compare the result against STREAM_VOICE_CALL , STREAM_SYSTEM , STREAM_RING , STREAM_MUSIC or STREAM_ALARM

            Notifies the native resource to reuse the audio data already loaded in the native layer. This call is only valid with AudioTrack instances that don't use the streaming model.

            Returns
            • error code or success, see SUCCESS , ERROR_BAD_VALUE , ERROR_INVALID_OPERATION

              Sets the send level of the audio track to the attached auxiliary effect . The level value range is 0 to 1.0.

              By default the send level is 0, so even if an effect is attached to the player this method must be called for the effect to be applied.

              Note that the passed level value is a raw scalar. UI controls should be scaled logarithmically: the gain applied by audio framework ranges from -72dB to 0dB, so an appropriate conversion from linear UI input x to level is: x == 0 -> level = 0 0 < x <= R -> level = 10^(72*(x-R)/20/R)

              Parameters
              level send level scalar

              Sets the playback head position. The track must be stopped for the position to be changed.

              Parameters
              positionInFrames playback head position expressed in frames

              Sets the listener the AudioTrack notifies when a previously set marker is reached or for each periodic playback head position update. Notifications will be received in the same thread as the one in which the AudioTrack instance was created.

              Sets the listener the AudioTrack notifies when a previously set marker is reached or for each periodic playback head position update. Use this method to receive AudioTrack events in the Handler associated with another thread than the one in which you created the AudioTrack instance.

              Parameters
              handler the Handler that will receive the event notification messages.

              Sets the playback sample rate for this track. This sets the sampling rate at which the audio data will be consumed and played back, not the original sampling rate of the content. Setting it to half the sample rate of the content will cause the playback to last twice as long, but will also result in a negative pitch shift. The valid sample rate range if from 1Hz to twice the value returned by getNativeOutputSampleRate(int) .

              Parameters
              sampleRateInHz the sample rate expressed in Hz

              Sets the specified left/right output volume values on the AudioTrack. Values are clamped to the ( getMinVolume() , getMaxVolume() ) interval if outside this range.

              Parameters
              leftVolume output attenuation for the left channel. A value of 0.0f is silence, a value of 1.0f is no attenuation. rightVolume output attenuation for the right channel
              Returns
              • the number of shorts that were written or ERROR_INVALID_OPERATION if the object wasn't properly initialized, or ERROR_BAD_VALUE if the parameters don't resolve to valid data and indexes.
                Returns
                • the number of bytes that were written or ERROR_INVALID_OPERATION if the object wasn't properly initialized, or ERROR_BAD_VALUE if the parameters don't resolve to valid data and indexes.

                  Called before the object's memory is reclaimed by the VM. This can only happen once the garbage collector has detected that the object is no longer reachable by any thread of the running application. The method can be used to free system resources or perform other cleanup before the object is garbage collected. The default implementation of the method is empty, which is also expected by the VM, but subclasses can override finalize() as required. Uncaught exceptions which are thrown during the execution of this method cause it to terminate immediately but are otherwise ignored. Note that the VM does guarantee that finalize() is called at most once for any object, but it doesn't guarantee when (if at all) finalize() will be called. For example, object B's finalize() can delay the execution of object A's finalize() method and therefore it can delay the reclamation of A's memory. To be safe, use a ReferenceQueue , because it provides more control over the way the VM deals with references during garbage collection.

                  Sets the initialization state of the instance. To be used in an AudioTrack subclass constructor to set a subclass-specific post-initialization state.

                  Parameters
                  state the state of the AudioTrack instance Except as noted, this content is licensed under Apache 2.0 . For details and restrictions, see the Content License . Android 2.3 r1 - 12 Nov 2011 9:28
     
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