content: /*
   * Copyright 2022 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.extractor.avi;
  
  import com.google.android.exoplayer2.C;
  import com.google.android.exoplayer2.util.Log;
  import com.google.android.exoplayer2.util.ParsableByteArray;
  import com.google.android.exoplayer2.util.Util;
  
  /** Parses and holds information from the AVISTREAMHEADER structure. */
  /* package */ final class AviStreamHeaderChunk implements AviChunk {
    private static final String TAG = "AviStreamHeaderChunk";
  
    public static AviStreamHeaderChunk parseFrom(ParsableByteArray body) {
      int streamType = body.readLittleEndianInt();
      body.skipBytes(12); // fccHandler (4 bytes), dwFlags (4 bytes), wPriority (2 bytes),
      // wLanguage (2 bytes).
      int initialFrames = body.readLittleEndianInt();
      int scale = body.readLittleEndianInt();
      int rate = body.readLittleEndianInt();
      body.skipBytes(4); // dwStart (4 bytes).
      int length = body.readLittleEndianInt();
      int suggestedBufferSize = body.readLittleEndianInt();
      body.skipBytes(8); // dwQuality (4 bytes), dwSampleSize (4 bytes).
      return new AviStreamHeaderChunk(
          streamType, initialFrames, scale, rate, length, suggestedBufferSize);
    }
  
    public final int streamType;
    public final int initialFrames;
    public final int scale;
    public final int rate;
    public final int length;
    public final int suggestedBufferSize;
  
    private AviStreamHeaderChunk(
        int streamType, int initialFrames, int scale, int rate, int length, int suggestedBufferSize) {
      this.streamType = streamType;
      this.initialFrames = initialFrames;
      this.scale = scale;
      this.rate = rate;
      this.length = length;
      this.suggestedBufferSize = suggestedBufferSize;
    }
  
    @Override
    public int getType() {
      return AviExtractor.FOURCC_strh;
    }
  
    public @C.TrackType int getTrackType() {
      switch (streamType) {
        case AviExtractor.FOURCC_auds:
          return C.TRACK_TYPE_AUDIO;
        case AviExtractor.FOURCC_vids:
          return C.TRACK_TYPE_VIDEO;
        case AviExtractor.FOURCC_txts:
          return C.TRACK_TYPE_TEXT;
        default:
          Log.w(TAG, "Found unsupported streamType fourCC: " + Integer.toHexString(streamType));
          return C.TRACK_TYPE_UNKNOWN;
      }
    }
  
    public float getFrameRate() {
      return rate / (float) scale;
    }
  
    public long getDurationUs() {
      return Util.scaleLargeTimestamp(
          /* timestamp= */ length,
          /* multiplier= */ C.MICROS_PER_SECOND * scale,
          /* divisor= */ rate);
    }
  }
  