content: /*
   * Copyright (C) 2020 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.amr;
  
  import static com.google.android.exoplayer2.extractor.amr.AmrExtractor.amrSignatureNb;
  import static com.google.android.exoplayer2.extractor.amr.AmrExtractor.amrSignatureWb;
  import static com.google.android.exoplayer2.extractor.amr.AmrExtractor.frameSizeBytesByTypeNb;
  import static com.google.android.exoplayer2.extractor.amr.AmrExtractor.frameSizeBytesByTypeWb;
  import static com.google.common.truth.Truth.assertThat;
  import static junit.framework.Assert.fail;
  
  import androidx.test.ext.junit.runners.AndroidJUnit4;
  import com.google.android.exoplayer2.ParserException;
  import com.google.android.exoplayer2.extractor.Extractor;
  import com.google.android.exoplayer2.extractor.PositionHolder;
  import com.google.android.exoplayer2.testutil.ExtractorAsserts;
  import com.google.android.exoplayer2.testutil.FakeExtractorInput;
  import com.google.android.exoplayer2.testutil.FakeExtractorOutput;
  import com.google.android.exoplayer2.util.Util;
  import java.io.IOException;
  import java.util.Random;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  
  /**
   * Tests for {@link AmrExtractor} that test specific behaviours and don't need to be parameterized.
   *
   * <p>For parameterized tests using {@link ExtractorAsserts} see {@link
   * AmrExtractorParameterizedTest}.
   */
  @RunWith(AndroidJUnit4.class)
  public final class AmrExtractorNonParameterizedTest {
  
    private static final Random RANDOM = new Random(1234);
  
    @Test
    public void sniff_nonAmrSignature_returnFalse() throws IOException {
      AmrExtractor amrExtractor = setupAmrExtractorWithOutput();
      FakeExtractorInput input = fakeExtractorInputWithData(Util.getUtf8Bytes("0#!AMR\n123"));
  
      boolean result = amrExtractor.sniff(input);
      assertThat(result).isFalse();
    }
  
    @Test
    public void read_nonAmrSignature_throwParserException() throws IOException {
      AmrExtractor amrExtractor = setupAmrExtractorWithOutput();
      FakeExtractorInput input = fakeExtractorInputWithData(Util.getUtf8Bytes("0#!AMR-WB\n"));
  
      try {
        amrExtractor.read(input, new PositionHolder());
        fail();
      } catch (ParserException e) {
        // expected
      }
    }
  
    @Test
    public void read_amrNb_returnParserException_forInvalidFrameType() throws IOException {
      AmrExtractor amrExtractor = setupAmrExtractorWithOutput();
  
      // Frame type 12-14 for narrow band is reserved for future usage.
      byte[] amrFrame = newNarrowBandAmrFrameWithType(12);
      byte[] data = joinData(amrSignatureNb(), amrFrame);
      FakeExtractorInput input = fakeExtractorInputWithData(data);
  
      try {
        amrExtractor.read(input, new PositionHolder());
        fail();
      } catch (ParserException e) {
        // expected
      }
    }
  
    @Test
    public void read_amrWb_returnParserException_forInvalidFrameType() throws IOException {
      AmrExtractor amrExtractor = setupAmrExtractorWithOutput();
  
      // Frame type 10-13 for wide band is reserved for future usage.
      byte[] amrFrame = newWideBandAmrFrameWithType(13);
      byte[] data = joinData(amrSignatureWb(), amrFrame);
      FakeExtractorInput input = fakeExtractorInputWithData(data);
  
      try {
        amrExtractor.read(input, new PositionHolder());
        fail();
      } catch (ParserException e) {
        // expected
      }
    }
  
    @Test
    public void read_amrNb_returnEndOfInput_ifInputEncountersEoF() throws IOException {
      AmrExtractor amrExtractor = setupAmrExtractorWithOutput();
  
      byte[] amrFrame = newNarrowBandAmrFrameWithType(3);
      byte[] data = joinData(amrSignatureNb(), amrFrame);
      FakeExtractorInput input = fakeExtractorInputWithData(data);
  
      // Read 1st frame, which will put the input at EoF.
      amrExtractor.read(input, new PositionHolder());
  
      int result = amrExtractor.read(input, new PositionHolder());
      assertThat(result).isEqualTo(Extractor.RESULT_END_OF_INPUT);
    }
  
    @Test
    public void read_amrWb_returnEndOfInput_ifInputEncountersEoF() throws IOException {
      AmrExtractor amrExtractor = setupAmrExtractorWithOutput();
  
      byte[] amrFrame = newWideBandAmrFrameWithType(5);
      byte[] data = joinData(amrSignatureWb(), amrFrame);
      FakeExtractorInput input = fakeExtractorInputWithData(data);
  
      // Read 1st frame, which will put the input at EoF.
      amrExtractor.read(input, new PositionHolder());
  
      int result = amrExtractor.read(input, new PositionHolder());
      assertThat(result).isEqualTo(Extractor.RESULT_END_OF_INPUT);
    }
  
    @Test
    public void read_amrNb_returnParserException_forInvalidFrameHeader() throws IOException {
      AmrExtractor amrExtractor = setupAmrExtractorWithOutput();
  
      byte[] invalidHeaderFrame = newNarrowBandAmrFrameWithType(4);
  
      // The padding bits are at bit-1 positions in the following pattern: 1000 0011
      // Padding bits must be 0.
      invalidHeaderFrame[0] = (byte) (invalidHeaderFrame[0] | 0b01111101);
  
      byte[] data = joinData(amrSignatureNb(), invalidHeaderFrame);
      FakeExtractorInput input = fakeExtractorInputWithData(data);
  
      try {
        amrExtractor.read(input, new PositionHolder());
        fail();
      } catch (ParserException e) {
        // expected
      }
    }
  
    @Test
    public void read_amrWb_returnParserException_forInvalidFrameHeader() throws IOException {
      AmrExtractor amrExtractor = setupAmrExtractorWithOutput();
  
      byte[] invalidHeaderFrame = newWideBandAmrFrameWithType(6);
  
      // The padding bits are at bit-1 positions in the following pattern: 1000 0011
      // Padding bits must be 0.
      invalidHeaderFrame[0] = (byte) (invalidHeaderFrame[0] | 0b01111110);
  
      byte[] data = joinData(amrSignatureWb(), invalidHeaderFrame);
      FakeExtractorInput input = fakeExtractorInputWithData(data);
  
      try {
        amrExtractor.read(input, new PositionHolder());
        fail();
      } catch (ParserException e) {
        // expected
      }
    }
  
    private byte[] newWideBandAmrFrameWithType(int frameType) {
      byte frameHeader = (byte) ((frameType << 3) & 0b01111100);
      int frameContentInBytes = frameSizeBytesByTypeWb(frameType) - 1;
  
      return joinData(new byte[] {frameHeader}, randomBytesArrayWithLength(frameContentInBytes));
    }
  
    private byte[] newNarrowBandAmrFrameWithType(int frameType) {
      byte frameHeader = (byte) ((frameType << 3) & 0b01111100);
      int frameContentInBytes = frameSizeBytesByTypeNb(frameType) - 1;
  
      return joinData(new byte[] {frameHeader}, randomBytesArrayWithLength(frameContentInBytes));
    }
  
    private static byte[] randomBytesArrayWithLength(int length) {
      byte[] result = new byte[length];
      RANDOM.nextBytes(result);
      return result;
    }
  
    private static byte[] joinData(byte[]... byteArrays) {
      int totalLength = 0;
      for (byte[] byteArray : byteArrays) {
        totalLength += byteArray.length;
      }
      byte[] result = new byte[totalLength];
      int offset = 0;
      for (byte[] byteArray : byteArrays) {
        System.arraycopy(byteArray, /* srcPos= */ 0, result, offset, byteArray.length);
        offset += byteArray.length;
      }
      return result;
    }
  
    private static AmrExtractor setupAmrExtractorWithOutput() {
      AmrExtractor amrExtractor = new AmrExtractor();
      FakeExtractorOutput output = new FakeExtractorOutput();
      amrExtractor.init(output);
      return amrExtractor;
    }
  
    private static FakeExtractorInput fakeExtractorInputWithData(byte[] data) {
      return new FakeExtractorInput.Builder().setData(data).build();
    }
  }
  