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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 */
#if !defined(OpusParser_h_)
# define OpusParser_h_
# include "nsTArray.h"
# include "nsString.h"
namespace mozilla {
class 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.
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