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      1 /*
      2  * Copyright (C) 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.cts.verifier.audio.audiolib;
     18 
     19 /**
     20  * An interface for objects which provide streamed audio data to a StreamPlayer instance.
     21  */
     22 public interface AudioFiller {
     23     /**
     24      * Reset a stream to the beginning.
     25      */
     26     public void reset();
     27 
     28     /**
     29      * Process a request for audio data.
     30      * @param buffer The buffer to be filled.
     31      * @param numFrames The number of frames of audio to provide.
     32      * @param numChans The number of channels (in the buffer) required by the player.
     33      * @return The number of frames actually generated. If this value is less than that
     34      * requested, it may be interpreted by the player as the end of playback.
     35      */
     36     public int fill(float[] buffer, int numFrames, int numChans);
     37 }
     38