gecko/content/media/wave/nsWaveDecoder.h

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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: */
2012-05-21 04:12:37 -07:00
/* 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(nsWaveDecoder_h_)
#define nsWaveDecoder_h_
#include "nsBuiltinDecoder.h"
/**
* The decoder implementation is currently limited to Linear PCM encoded
* audio data with one or two channels of 8- or 16-bit samples at sample
* rates from 100 Hz to 96 kHz. The number of channels is limited by what
* the audio backend (sydneyaudio via nsAudioStream) currently supports. The
* supported sample rate is artificially limited to arbitrarily selected sane
* values. Support for additional channels (and other new features) would
* require extending nsWaveDecoder to support parsing the newer
* WAVE_FORMAT_EXTENSIBLE chunk format.
**/
class nsWaveDecoder : public nsBuiltinDecoder
{
public:
virtual nsMediaDecoder* Clone() {
if (!nsHTMLMediaElement::IsWaveEnabled()) {
return nullptr;
}
return new nsWaveDecoder();
}
virtual nsDecoderStateMachine* CreateStateMachine();
};
#endif