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 /* -*- 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 <stdint.h>

 #include <opus/opus.h>

 #include "opus/opus_multistream.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);

   // 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