1 files changed, 91 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/audio/WavUtil.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/audio/WavUtil.java
new file mode 100644
index 0000000000..d1245761aa
--- /dev/null
+++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/audio/WavUtil.java
@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2018 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 org.mozilla.thirdparty.com.google.android.exoplayer2.audio;
+
+import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.Format;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Util;
+
+/** Utilities for handling WAVE files. */
+public final class WavUtil {
+
+  /** Four character code for "RIFF". */
+  public static final int RIFF_FOURCC = 0x52494646;
+  /** Four character code for "WAVE". */
+  public static final int WAVE_FOURCC = 0x57415645;
+  /** Four character code for "fmt ". */
+  public static final int FMT_FOURCC = 0x666d7420;
+  /** Four character code for "data". */
+  public static final int DATA_FOURCC = 0x64617461;
+
+  /** WAVE type value for integer PCM audio data. */
+  public static final int TYPE_PCM = 0x0001;
+  /** WAVE type value for float PCM audio data. */
+  public static final int TYPE_FLOAT = 0x0003;
+  /** WAVE type value for 8-bit ITU-T G.711 A-law audio data. */
+  public static final int TYPE_ALAW = 0x0006;
+  /** WAVE type value for 8-bit ITU-T G.711 mu-law audio data. */
+  public static final int TYPE_MLAW = 0x0007;
+  /** WAVE type value for IMA ADPCM audio data. */
+  public static final int TYPE_IMA_ADPCM = 0x0011;
+  /** WAVE type value for extended WAVE format. */
+  public static final int TYPE_WAVE_FORMAT_EXTENSIBLE = 0xFFFE;
+
+  /**
+   * Returns the WAVE format type value for the given {@link C.PcmEncoding}.
+   *
+   * @param pcmEncoding The {@link C.PcmEncoding} value.
+   * @return The corresponding WAVE format type.
+   * @throws IllegalArgumentException If {@code pcmEncoding} is not a {@link C.PcmEncoding}, or if
+   *     it's {@link C#ENCODING_INVALID} or {@link Format#NO_VALUE}.
+   */
+  public static int getTypeForPcmEncoding(@C.PcmEncoding int pcmEncoding) {
+    switch (pcmEncoding) {
+      case C.ENCODING_PCM_8BIT:
+      case C.ENCODING_PCM_16BIT:
+      case C.ENCODING_PCM_24BIT:
+      case C.ENCODING_PCM_32BIT:
+        return TYPE_PCM;
+      case C.ENCODING_PCM_FLOAT:
+        return TYPE_FLOAT;
+      case C.ENCODING_PCM_16BIT_BIG_ENDIAN: // Not TYPE_PCM, because TYPE_PCM is little endian.
+      case C.ENCODING_INVALID:
+      case Format.NO_VALUE:
+      default:
+        throw new IllegalArgumentException();
+    }
+  }
+
+  /**
+   * Returns the {@link C.PcmEncoding} for the given WAVE format type value, or {@link
+   * C#ENCODING_INVALID} if the type is not a known PCM type.
+   */
+  public static @C.PcmEncoding int getPcmEncodingForType(int type, int bitsPerSample) {
+    switch (type) {
+      case TYPE_PCM:
+      case TYPE_WAVE_FORMAT_EXTENSIBLE:
+        return Util.getPcmEncoding(bitsPerSample);
+      case TYPE_FLOAT:
+        return bitsPerSample == 32 ? C.ENCODING_PCM_FLOAT : C.ENCODING_INVALID;
+      default:
+        return C.ENCODING_INVALID;
+    }
+  }
+
+  private WavUtil() {
+    // Prevent instantiation.
+  }
+}