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122 lines
4.3 KiB
C++
122 lines
4.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla code.
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*
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* The Initial Developer of the Original Code is the Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Matthew Gregan <kinetik@flim.org>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#if !defined(nsWaveReader_h_)
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#define nsWaveReader_h_
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#include "nsBuiltinDecoderReader.h"
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class nsBuiltinDecoder;
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class nsTimeRanges;
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class nsWaveReader : public nsBuiltinDecoderReader
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{
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public:
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nsWaveReader(nsBuiltinDecoder* aDecoder);
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~nsWaveReader();
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virtual nsresult Init(nsBuiltinDecoderReader* aCloneDonor);
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virtual bool DecodeAudioData();
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virtual bool DecodeVideoFrame(bool &aKeyframeSkip,
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PRInt64 aTimeThreshold);
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virtual bool HasAudio()
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{
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return true;
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}
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virtual bool HasVideo()
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{
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return false;
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}
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virtual nsresult ReadMetadata(nsVideoInfo* aInfo);
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virtual nsresult Seek(PRInt64 aTime, PRInt64 aStartTime, PRInt64 aEndTime, PRInt64 aCurrentTime);
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virtual nsresult GetBuffered(nsTimeRanges* aBuffered, PRInt64 aStartTime);
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private:
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bool ReadAll(char* aBuf, PRInt64 aSize, PRInt64* aBytesRead = nsnull);
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bool LoadRIFFChunk();
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bool ScanForwardUntil(PRUint32 aWantedChunk, PRUint32* aChunkSize);
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bool LoadFormatChunk();
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bool FindDataOffset();
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// Returns the number of seconds that aBytes represents based on the
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// current audio parameters. e.g. 176400 bytes is 1 second at 16-bit
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// stereo 44.1kHz. The time is rounded to the nearest microsecond.
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double BytesToTime(PRInt64 aBytes) const;
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// Returns the number of bytes that aTime represents based on the current
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// audio parameters. e.g. 1 second is 176400 bytes at 16-bit stereo
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// 44.1kHz.
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PRInt64 TimeToBytes(double aTime) const;
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// Rounds aBytes down to the nearest complete audio frame. Assumes
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// beginning of byte range is already frame aligned by caller.
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PRInt64 RoundDownToFrame(PRInt64 aBytes) const;
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PRInt64 GetDataLength();
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PRInt64 GetPosition();
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/*
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Metadata extracted from the WAVE header. Used to initialize the audio
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stream, and for byte<->time domain conversions.
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*/
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// Number of samples per second. Limited to range [100, 96000] in LoadFormatChunk.
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PRUint32 mSampleRate;
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// Number of channels. Limited to range [1, 2] in LoadFormatChunk.
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PRUint32 mChannels;
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// Size of a single audio frame, which includes a sample for each channel
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// (interleaved).
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PRUint32 mFrameSize;
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// The sample format of the PCM data.
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nsAudioStream::SampleFormat mSampleFormat;
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// Size of PCM data stored in the WAVE as reported by the data chunk in
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// the media.
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PRInt64 mWaveLength;
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// Start offset of the PCM data in the media stream. Extends mWaveLength
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// bytes.
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PRInt64 mWavePCMOffset;
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};
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#endif
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