gecko/content/media/ogg/nsOggReader.h

140 lines
5.2 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: */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla code.
*
* The Initial Developer of the Original Code is the Mozilla Corporation.
* Portions created by the Initial Developer are Copyright (C) 2007
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Chris Double <chris.double@double.co.nz>
* Chris Pearce <chris@pearce.org.nz>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#if !defined(nsOggReader_h_)
#define nsOggReader_h_
#include <ogg/ogg.h>
#include <theora/theoradec.h>
#include <vorbis/codec.h>
#include "nsBuiltinDecoderReader.h"
#include "nsOggCodecState.h"
class nsMediaDecoder;
class nsOggReader : public nsBuiltinDecoderReader
{
public:
nsOggReader(nsBuiltinDecoder* aDecoder);
~nsOggReader();
virtual nsresult Init();
virtual nsresult ResetDecode();
virtual PRBool DecodeAudioData();
// If the Theora granulepos has not been captured, it may read several packets
// until one with a granulepos has been captured, to ensure that all packets
// read have valid time info.
virtual PRBool DecodeVideoFrame(PRBool &aKeyframeSkip,
PRInt64 aTimeThreshold);
virtual VideoData* FindStartTime(PRInt64 aOffset,
PRInt64& aOutStartTime);
virtual PRInt64 FindEndTime(PRInt64 aEndOffset);
virtual PRBool HasAudio()
{
mozilla::MonitorAutoEnter mon(mMonitor);
return mVorbisState != 0 && mVorbisState->mActive;
}
virtual PRBool HasVideo()
{
mozilla::MonitorAutoEnter mon(mMonitor);
return mTheoraState != 0 && mTheoraState->mActive;
}
virtual nsresult ReadMetadata();
virtual nsresult Seek(PRInt64 aTime, PRInt64 aStartTime, PRInt64 aEndTime);
private:
// Decodes one packet of Vorbis data, storing the resulting chunks of
// PCM samples in aChunks.
nsresult DecodeVorbis(nsTArray<SoundData*>& aChunks,
ogg_packet* aPacket);
// May return NS_ERROR_OUT_OF_MEMORY.
nsresult DecodeTheora(nsTArray<VideoData*>& aFrames,
ogg_packet* aPacket);
// Read a page of data from the Ogg file. Returns the offset of the start
// of the page, or -1 if the page read failed.
PRInt64 ReadOggPage(ogg_page* aPage);
// Read a packet for an Ogg bitstream/codec state. Returns PR_TRUE on
// success, or PR_FALSE if the read failed.
PRBool ReadOggPacket(nsOggCodecState* aCodecState, ogg_packet* aPacket);
// Performs a seek bisection to move the media stream's read cursor to the
// last ogg page boundary which has end time before aTarget ms on both the
// Theora and Vorbis bitstreams. Limits its search to data inside aRange;
// i.e. it will only read inside of the aRange's start and end offsets.
// aFuzz is the number of ms of leniency we'll allow; we'll terminate the
// seek when we land in the range (aTime - aFuzz, aTime) ms.
nsresult SeekBisection(PRInt64 aTarget,
const ByteRange& aRange,
PRUint32 aFuzz);
private:
// Maps Ogg serialnos to nsOggStreams.
nsClassHashtable<nsUint32HashKey, nsOggCodecState> mCodecStates;
// Decode state of the Theora bitstream we're decoding, if we have video.
nsTheoraState* mTheoraState;
// Decode state of the Vorbis bitstream we're decoding, if we have audio.
nsVorbisState* mVorbisState;
// Ogg decoding state.
ogg_sync_state mOggState;
// The offset of the end of the last page we've read, or the start of
// the page we're about to read.
PRInt64 mPageOffset;
// Number of milliseconds of data video/audio data held in a frame.
PRUint32 mCallbackPeriod;
// The granulepos of the last decoded Theora frame.
PRInt64 mTheoraGranulepos;
// The granulepos of the last decoded Vorbis sample.
PRInt64 mVorbisGranulepos;
};
#endif