Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* vim:set ts=2 sw=2 sts=2 et cindent: */
       3             : /* This Source Code Form is subject to the terms of the Mozilla Public
       4             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       5             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       6             : #if !defined(OpusParser_h_)
       7             : #define OpusParser_h_
       8             : 
       9             : #include "nsTArray.h"
      10             : #include "nsString.h"
      11             : 
      12             : namespace mozilla {
      13             : 
      14           0 : class OpusParser
      15             : {
      16             : public:
      17             :   OpusParser();
      18             : 
      19             :   bool DecodeHeader(unsigned char* aData, size_t aLength);
      20             :   bool DecodeTags(unsigned char* aData, size_t aLength);
      21             : 
      22             :   // Various fields from the Ogg Opus header.
      23             :   int mRate;        // Sample rate the decoder uses (always 48 kHz).
      24             :   uint32_t mNominalRate; // Original sample rate of the data (informational).
      25             :   int mChannels;    // Number of channels the stream encodes.
      26             :   uint16_t mPreSkip; // Number of samples to strip after decoder reset.
      27             : #ifdef MOZ_SAMPLE_TYPE_FLOAT32
      28             :   float mGain;      // Gain to apply to decoder output.
      29             : #else
      30             :   int32_t mGain_Q16; // Gain to apply to the decoder output.
      31             : #endif
      32             :   int mChannelMapping; // Channel mapping family.
      33             :   int mStreams;     // Number of packed streams in each packet.
      34             :   int mCoupledStreams; // Number of packed coupled streams in each packet.
      35             :   unsigned char mMappingTable[255]; // Channel mapping table.
      36             : 
      37             :   // Granule position (end sample) of the last decoded Opus packet. This is
      38             :   // used to calculate the amount we should trim from the last packet.
      39             :   int64_t mPrevPacketGranulepos;
      40             : 
      41             :   nsTArray<nsCString> mTags; // Unparsed comment strings from the header.
      42             : 
      43             :   nsCString mVendorString;   // Encoder vendor string from the header.
      44             : };
      45             : 
      46             : } // namespace mozilla
      47             : 
      48             : #endif