安卓系统音频源的设置

    /**
     * Defines the audio source.
     * An audio source defines both a default physical source of audio signal, and a recording
     * configuration. These constants are for instance used
     * in {@link MediaRecorder#setAudioSource(int)} or
     * {@link AudioRecord.Builder#setAudioSource(int)}.
     */
    public final class AudioSource {

        private AudioSource() {}

        /** @hide */
        public final static int AUDIO_SOURCE_INVALID = -1;

      /* Do not change these values without updating their counterparts
       * in system/media/audio/include/system/audio.h!
       */

        /** Default audio source **/
        public static final int DEFAULT = 0;

        /** Microphone audio source */
        public static final int MIC = 1;

        /** Voice call uplink (Tx) audio source.
         * <p>
         * Capturing from <code>VOICE_UPLINK</code> source requires the
         * {@link android.Manifest.permission#CAPTURE_AUDIO_OUTPUT} permission.
         * This permission is reserved for use by system components and is not available to
         * third-party applications.
         * </p>
         */
        public static final int VOICE_UPLINK = 2;

        /** Voice call downlink (Rx) audio source.
         * <p>
         * Capturing from <code>VOICE_DOWNLINK</code> source requires the
         * {@link android.Manifest.permission#CAPTURE_AUDIO_OUTPUT} permission.
         * This permission is reserved for use by system components and is not available to
         * third-party applications.
         * </p>
         */
        public static final int VOICE_DOWNLINK = 3;

        /** Voice call uplink + downlink audio source
         * <p>
         * Capturing from <code>VOICE_CALL</code> source requires the
         * {@link android.Manifest.permission#CAPTURE_AUDIO_OUTPUT} permission.
         * This permission is reserved for use by system components and is not available to
         * third-party applications.
         * </p>
         */
        public static final int VOICE_CALL = 4;

        /** Microphone audio source tuned for video recording, with the same orientation
         *  as the camera if available. */
        public static final int CAMCORDER = 5;

        /** Microphone audio source tuned for voice recognition. */
        public static final int VOICE_RECOGNITION = 6;

        /** Microphone audio source tuned for voice communications such as VoIP. It
         *  will for instance take advantage of echo cancellation or automatic gain control
         *  if available.
         */
        public static final int VOICE_COMMUNICATION = 7;

        /**
         * Audio source for a submix of audio streams to be presented remotely.
         * <p>
         * An application can use this audio source to capture a mix of audio streams
         * that should be transmitted to a remote receiver such as a Wifi display.
         * While recording is active, these audio streams are redirected to the remote
         * submix instead of being played on the device speaker or headset.
         * </p><p>
         * Certain streams are excluded from the remote submix, including
         * {@link AudioManager#STREAM_RING}, {@link AudioManager#STREAM_ALARM},
         * and {@link AudioManager#STREAM_NOTIFICATION}.  These streams will continue
         * to be presented locally as usual.
         * </p><p>
         * Capturing the remote submix audio requires the
         * {@link android.Manifest.permission#CAPTURE_AUDIO_OUTPUT} permission.
         * This permission is reserved for use by system components and is not available to
         * third-party applications.
         * </p>
         */
        public static final int REMOTE_SUBMIX = 8;

        /** Microphone audio source tuned for unprocessed (raw) sound if available, behaves like
         *  {@link #DEFAULT} otherwise. */
        public static final int UNPROCESSED = 9;

        /**
         * Audio source for capturing broadcast radio tuner output.
         * @hide
         */
        @SystemApi
        public static final int RADIO_TUNER = 1998;

        /**
         * Audio source for preemptible, low-priority software hotword detection
         * It presents the same gain and pre processing tuning as {@link #VOICE_RECOGNITION}.
         * <p>
         * An application should use this audio source when it wishes to do
         * always-on software hotword detection, while gracefully giving in to any other application
         * that might want to read from the microphone.
         * </p>
         * This is a hidden audio source.
         * @hide
         */
        @SystemApi
        public static final int HOTWORD = 1999;
    }

    // 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:
            return false;
        default:
            return true;
        }
    }

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