content: /*
   * Copyright 2021 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.google.android.exoplayer2.transformer;
  
  import androidx.annotation.Nullable;
  import com.google.android.exoplayer2.decoder.DecoderInputBuffer;
  
  /**
   * Pipeline for processing {@link DecoderInputBuffer DecoderInputBuffers}.
   *
   * <p>This pipeline can be used to implement transformations of audio or video samples.
   */
  /* package */ interface SamplePipeline {
  
    /** Returns a buffer if the pipeline is ready to accept input, and {@code null} otherwise. */
    @Nullable
    DecoderInputBuffer dequeueInputBuffer() throws TransformationException;
  
    /**
     * Informs the pipeline that its input buffer contains new input.
     *
     * <p>Should be called after filling the input buffer from {@link #dequeueInputBuffer()} with new
     * input.
     */
    void queueInputBuffer() throws TransformationException;
  
    /**
     * Processes the input data and returns whether it may be possible to process more data by calling
     * this method again.
     */
    boolean processData() throws TransformationException;
  
    /** Returns whether the pipeline has ended. */
    boolean isEnded();
  
    /** Releases all resources held by the pipeline. */
    void release();
  }
  