gecko-dev/dom/media/wave/WaveDecoder.h

40 строки
1.3 KiB
C++

/* -*- 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(WaveDecoder_h_)
#define WaveDecoder_h_
#include "MediaDecoder.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 (via AudioStream) 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 WaveDecoder to support parsing the newer
* WAVE_FORMAT_EXTENSIBLE chunk format.
**/
namespace mozilla {
class WaveDecoder : public MediaDecoder
{
public:
explicit WaveDecoder(MediaDecoderOwner* aOwner) : MediaDecoder(aOwner) {}
virtual MediaDecoder* Clone(MediaDecoderOwner* aOwner) {
if (!IsWaveEnabled()) {
return nullptr;
}
return new WaveDecoder(aOwner);
}
virtual MediaDecoderStateMachine* CreateStateMachine();
};
} // namespace mozilla
#endif