244 lines
8.6 KiB
C
244 lines
8.6 KiB
C
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/*
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*
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* @APPLE_LICENSE_HEADER_START@
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*
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* Copyright (c) 1999-2008 Apple Inc. All Rights Reserved.
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this
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* file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_LICENSE_HEADER_END@
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*
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*/
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//
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// QTHintTrack:
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// The central point of control for a hint track in a QTFile.
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#ifndef QTHintTrack_H
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#define QTHintTrack_H
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//
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// Includes
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#include "QTTrack.h"
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#include "QTAtom_hinf.h"
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#include "QTAtom_tref.h"
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#include "RTPMetaInfoPacket.h"
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#include "MyAssert.h"
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//
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// External classes
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class QTFile;
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class QTAtom_stsc_SampleTableControlBlock;
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class QTAtom_stts_SampleTableControlBlock;
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class QTHintTrackRTPHeaderData {
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public:
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UInt16 rtpHeaderBits;
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UInt16 rtpSequenceNumber;
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SInt32 relativePacketTransmissionTime;
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UInt16 hintFlags;
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UInt16 dataEntryCount;
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UInt32 tlvSize;
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SInt32 tlvTimestampOffset; //'rtpo' TLV which is the timestamp offset for this packet
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};
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//
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// Class state cookie
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class QTHintTrack_HintTrackControlBlock {
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public:
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//
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// Constructor and destructor.
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QTHintTrack_HintTrackControlBlock(QTFile_FileControlBlock * FCB = NULL);
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virtual ~QTHintTrack_HintTrackControlBlock(void);
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//
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// If you are moving around randomly (seeking), you should call this to reset
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// caches
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void Reset();
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//
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// If you want this HTCB to build RTP Meta Info packets,
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// tell it which fields to add, and also which IDs to assign, by passing
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// in an array of RTPMetaInfoPacket::kNumFields size, with all the right info
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void SetupRTPMetaInfo(RTPMetaInfoPacket::FieldID* inFieldArray, Bool16 isVideo)
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{ Assert(fRTPMetaInfoFieldArray == NULL); fRTPMetaInfoFieldArray = inFieldArray;
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fIsVideo = isVideo;
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}
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//
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// File control block
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QTFile_FileControlBlock *fFCB;
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//
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// Sample Table control blocks
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QTAtom_stsc_SampleTableControlBlock fstscSTCB;
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QTAtom_stts_SampleTableControlBlock fsttsSTCB;
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//
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// Sample cache
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UInt32 fCachedSampleNumber;
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char * fCachedSample;
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UInt32 fCachedSampleSize, fCachedSampleLength;
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//
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// Sample (description) cache
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UInt32 fCachedHintTrackSampleNumber, fCachedHintTrackSampleOffset;
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char * fCachedHintTrackSample;
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UInt32 fCachedHintTrackSampleLength;
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UInt32 fCachedHintTrackBufferLength;
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UInt16 fLastPacketNumberFetched; // for optimizing Getting a packet from a cached sample
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char* fPointerToNextPacket; // after we get one, we point the next at this...
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//
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// To support RTP-Meta-Info payload
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RTPMetaInfoPacket::FieldID* fRTPMetaInfoFieldArray;
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UInt32 fSyncSampleCursor; // Where are we in the sync sample table?
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Bool16 fIsVideo; // so that we know what to do with the frame type field
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UInt64 fCurrentPacketNumber;
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UInt64 fCurrentPacketPosition;
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SInt32 fMediaTrackRefIndex;
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QTAtom_stsc_SampleTableControlBlock * fMediaTrackSTSC_STCB;
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};
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//
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// QTHintTrack class
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class QTHintTrack : public QTTrack {
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public:
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//
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// Constructors and destructor.
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QTHintTrack(QTFile * File, QTFile::AtomTOCEntry * trakAtom,
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Bool16 Debug = false, Bool16 DeepDebug = false);
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virtual ~QTHintTrack(void);
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//
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// Initialization functions.
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virtual ErrorCode Initialize(void);
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Bool16 IsHintTrackInitialized() { return fHintTrackInitialized; }
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//
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// Accessors.
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ErrorCode GetSDPFileLength(int * Length);
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char * GetSDPFile(int * Length);
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inline UInt64 GetTotalRTPBytes(void) { return fHintInfoAtom ? fHintInfoAtom->GetTotalRTPBytes() : 0; }
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inline UInt64 GetTotalRTPPackets(void) { return fHintInfoAtom ? fHintInfoAtom->GetTotalRTPPackets() : 0; }
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inline UInt32 GetFirstRTPTimestamp(void) { return fFirstRTPTimestamp; }
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inline void SetAllowInvalidHintRefs(Bool16 inAllowInvalidHintRefs) { fAllowInvalidHintRefs = inAllowInvalidHintRefs; }
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//
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// Sample functions
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Bool16 GetSamplePtr(UInt32 SampleNumber, char ** Buffer, UInt32 * Length,
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QTHintTrack_HintTrackControlBlock * HTCB);
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//
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// Packet functions
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inline UInt32 GetRTPTimescale(void) { return fRTPTimescale; }
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inline UInt32 GetRTPTimestampRandomOffset(void) { return fTimestampRandomOffset; }
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inline UInt16 GetRTPSequenceNumberRandomOffset(void) { return fSequenceNumberRandomOffset; }
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ErrorCode GetNumPackets(UInt32 SampleNumber, UInt16 * NumPackets,
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QTHintTrack_HintTrackControlBlock * HTCB = NULL);
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//
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// This function will build an RTP-Meta-Info packet if the last argument
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// is non-NULL. Some caveats apply to maximize performance of this operation:
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//
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// 1. If the "md" (media data) field is desired, please put it at the end.
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//
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// 2. If you want to use compressed fields, pass in the field ID in the first
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// byte of the TwoCharConst. Also set the high bit to indicate that this
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// is a compressed field ID.
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//
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// Supported fields: tt, md, ft, pp, pn, sq
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ErrorCode GetPacket(UInt32 SampleNumber, UInt16 PacketNumber,
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char * Buffer, UInt32 * Length,
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Float64 * TransmitTime,
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Bool16 dropBFrames,
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Bool16 dropRepeatPackets = false,
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UInt32 SSRC = 0,
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QTHintTrack_HintTrackControlBlock * HTCB = NULL);
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inline ErrorCode GetSampleData( QTHintTrack_HintTrackControlBlock * htcb, char **buffPtr, char **ppPacketBufOut, UInt32 sampleNumber, UInt16 packetNumber, UInt32 buffOutLen );
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//
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// Debugging functions.
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virtual void DumpTrack(void);
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// only reliable after all of the packets have been played
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// any hint packet may reference another media track and we don't know until all have been played.
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inline SInt16 GetHintTrackType(void) { return fHintType; }
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protected:
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enum
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{
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kRepeatPacketMask = 0x0001,
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kBFrameBitMask = 0x0002
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};
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enum
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{
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kUnknown = 0,
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kOptimized = -1,
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kUnoptimized = 1
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};
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enum
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{
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kMaxHintTrackRefs = 1024
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};
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//
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// Protected member variables.
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QTAtom_hinf *fHintInfoAtom;
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QTAtom_tref *fHintTrackReferenceAtom;
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QTTrack **fTrackRefs;
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UInt32 fMaxPacketSize;
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UInt32 fRTPTimescale, fFirstRTPTimestamp;
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UInt32 fTimestampRandomOffset;
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UInt16 fSequenceNumberRandomOffset;
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Bool16 fHintTrackInitialized;
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SInt16 fHintType;
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Float64 fFirstTransmitTime;
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Bool16 fAllowInvalidHintRefs;
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//
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// Used by GetPacket for RTP-Meta-Info payload stuff
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void WriteMetaInfoField( RTPMetaInfoPacket::FieldIndex inFieldIndex,
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RTPMetaInfoPacket::FieldID inFieldID,
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void* inFieldData, UInt32 inFieldLen, char** ioBuffer);
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inline QTTrack::ErrorCode GetSamplePacketPtr( char ** samplePacketPtr, UInt32 sampleNumber, UInt16 packetNumber, QTHintTrackRTPHeaderData &hdrData, QTHintTrack_HintTrackControlBlock & htcb);
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inline void GetSamplePacketHeaderVars( char *samplePacketPtr,char *maxBuffPtr, QTHintTrackRTPHeaderData &hdrData );
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};
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#endif // QTHintTrack_H
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