1 files changed, 48 insertions, 0 deletions
diff --git a/dom/media/ogg/OpusParser.h b/dom/media/ogg/OpusParser.h
new file mode 100644
index 0000000000..fc2fc5094d
--- /dev/null
+++ b/dom/media/ogg/OpusParser.h
@@ -0,0 +1,48 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#if !defined(OpusParser_h_)
+#  define OpusParser_h_
+
+#  include "nsTArray.h"
+#  include "nsString.h"
+
+namespace mozilla {
+
+class OpusParser {
+ public:
+  OpusParser();
+
+  bool DecodeHeader(unsigned char* aData, size_t aLength);
+  bool DecodeTags(unsigned char* aData, size_t aLength);
+  static bool IsValidMapping2ChannelsCount(uint8_t aChannels);
+
+  // Various fields from the Ogg Opus header.
+  int mRate;              // Sample rate the decoder uses (always 48 kHz).
+  uint32_t mNominalRate;  // Original sample rate of the data (informational).
+  int mChannels;          // Number of channels the stream encodes.
+  uint16_t mPreSkip;      // Number of samples to strip after decoder reset.
+#  ifdef MOZ_SAMPLE_TYPE_FLOAT32
+  float mGain;  // Gain to apply to decoder output.
+#  else
+  int32_t mGain_Q16;  // Gain to apply to the decoder output.
+#  endif
+  int mChannelMapping;  // Channel mapping family.
+  int mStreams;         // Number of packed streams in each packet.
+  int mCoupledStreams;  // Number of packed coupled streams in each packet.
+  unsigned char mMappingTable[255];  // Channel mapping table.
+
+  // Granule position (end sample) of the last decoded Opus packet. This is
+  // used to calculate the amount we should trim from the last packet.
+  int64_t mPrevPacketGranulepos;
+
+  nsTArray<nsCString> mTags;  // Unparsed comment strings from the header.
+
+  nsCString mVendorString;  // Encoder vendor string from the header.
+};
+
+}  // namespace mozilla
+
+#endif