content: /*
   * Copyright (C) 2017 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.android.server.usb.descriptors;
  
  import com.android.server.usb.descriptors.report.ReportCanvas;
  
  /**
   * @hide
   * An audio class-specific Format II interface.
   * see Frmts10.pdf section 2.3
   */
  public final class Usb10ASFormatII extends UsbASFormat {
      private static final String TAG = "Usb10ASFormatII";
  
      private int mMaxBitRate; // 4:2 Indicates the maximum number of bits per second this
                              // interface can handle. Expressed in kbits/s.
      private int mSamplesPerFrame;   // 6:2 Indicates the number of PCM audio samples contained
                                      // in one encoded audio frame.
      private byte mSamFreqType;  // Indicates how the sampling frequency can be programmed:
                                  // 0: Continuous sampling frequency
                                  // 1..255: The number of discrete sampling frequencies supported
                                  // by the isochronous data endpoint of the AudioStreaming
                                  // interface (ns)
      private int[] mSampleRates; // if mSamFreqType == 0, there will be 2 values:
                                  // the min & max rates. otherwise mSamFreqType rates.
                                  // All 3-byte values. All rates in Hz
  
      public Usb10ASFormatII(int length, byte type, byte subtype, byte formatType, int subclass) {
          super(length, type, subtype, formatType, subclass);
      }
  
      public int getMaxBitRate() {
          return mMaxBitRate;
      }
  
      public int getSamplesPerFrame() {
          return mSamplesPerFrame;
      }
  
      public byte getSamFreqType() {
          return mSamFreqType;
      }
  
      public int[] getSampleRates() {
          return mSampleRates;
      }
  
      @Override
      public int parseRawDescriptors(ByteStream stream) {
          mMaxBitRate = stream.unpackUsbShort();
          mSamplesPerFrame = stream.unpackUsbShort();
          mSamFreqType = stream.getByte();
          int numFreqs = mSamFreqType == 0 ? 2 : mSamFreqType;
          mSampleRates = new int[numFreqs];
          for (int index = 0; index < numFreqs; index++) {
              mSampleRates[index] = stream.unpackUsbTriple();
          }
  
          return mLength;
      }
  
      @Override
      public void report(ReportCanvas canvas) {
          super.report(canvas);
  
          canvas.openList();
          canvas.writeListItem("Max Bit Rate: " + getMaxBitRate());
          canvas.writeListItem("Samples Per Frame: " + getMaxBitRate());
          byte sampleFreqType = getSamFreqType();
          int[] sampleRates = getSampleRates();
          canvas.writeListItem("Sample Freq Type: " + sampleFreqType);
          canvas.openList();
          if (sampleFreqType == 0) {
              canvas.writeListItem("min: " + sampleRates[0]);
              canvas.writeListItem("max: " + sampleRates[1]);
          } else {
              for (int index = 0; index < sampleFreqType; index++) {
                  canvas.writeListItem("" + sampleRates[index]);
              }
          }
          canvas.closeList();
  
          canvas.closeList();
      }
  
  }
  