content/media/ogg/OpusParser.h
author Jan Gerber <j@mailb.org>
Fri, 22 Nov 2013 14:06:00 -0800
changeset 174048 8c2dbfc2463f05723bde9100ecb87a3b2b84fea3
child 174059 357c5de8547b92b11761fd6b67abc8014dcc3f51
permissions -rw-r--r--
Bug 938686 - Refactor Opus header parsing so it can be reused. r=kinetik We want to be able to use the same header parser for both the WebM and Ogg readers.

/* -*- 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"

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