Android音频系统之AudioTrack(一)_这里调用了native_setup来创建一个本地audiotrack对象

/*cts/tests/tests/media/src/android/media/cts*/

    public voidtestSetStereoVolumeMax()  throwsException {

        final String TEST_NAME= "testSetStereoVolumeMax";

        final int TEST_SR =22050;

        final int TEST_CONF =AudioFormat.CHANNEL_CONFIGURATION_STEREO;

        final int TEST_FORMAT= AudioFormat.ENCODING_PCM_16BIT;

        final int TEST_MODE =AudioTrack.MODE_STREAM;

        final intTEST_STREAM_TYPE = AudioManager.STREAM_MUSIC;

        // --------initialization --------------

                                /*Step1.*/

        int  minBuffSize = AudioTrack.getMinBufferSize(TEST_SR, TEST_CONF, TEST_FORMAT);

         /*Step 2.*/

        AudioTrack  track = newAudioTrack(TEST_STREAM_TYPE, TEST_SR, TEST_CONF,

                                                                                                                                                 TEST_FORMAT, 2 * minBuffSize,TEST_MODE);

        byte data[] = newbyte[minBuffSize];

        // -------- test--------------

        track.write(data, OFFSET_DEFAULT, data.length);

        track.write(data, OFFSET_DEFAULT, data.length);

        track.play();

        float maxVol =AudioTrack.getMaxVolume();

        assertTrue(TEST_NAME, track.setStereoVolume(maxVol, maxVol) == AudioTrack.SUCCESS);

        // -------- tear down--------------

        track.release();

    }