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|
/*****************************************************************
|
| AP4 - File Writer
|
| Copyright 2002-2008 Axiomatic Systems, LLC
|
|
| This file is part of Bento4/AP4 (MP4 Atom Processing Library).
|
| Unless you have obtained Bento4 under a difference license,
| this version of Bento4 is Bento4|GPL.
| Bento4|GPL is free software; you can redistribute it and/or modify
| it under the terms of the GNU General Public License as published by
| the Free Software Foundation; either version 2, or (at your option)
| any later version.
|
| Bento4|GPL is distributed in the hope that it will be useful,
| but WITHOUT ANY WARRANTY; without even the implied warranty of
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
| GNU General Public License for more details.
|
| You should have received a copy of the GNU General Public License
| along with Bento4|GPL; see the file COPYING. If not, write to the
| Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
| 02111-1307, USA.
|
****************************************************************/
#ifndef _AP4_LINEAR_READER_H_
#define _AP4_LINEAR_READER_H_
/*----------------------------------------------------------------------
| includes
+---------------------------------------------------------------------*/
#include "Ap4Types.h"
#include "Ap4Array.h"
#include "Ap4Movie.h"
#include "Ap4Sample.h"
#include "Ap4Protection.h"
/*----------------------------------------------------------------------
| class references
+---------------------------------------------------------------------*/
class AP4_Track;
class AP4_MovieFragment;
/*----------------------------------------------------------------------
| constants
+---------------------------------------------------------------------*/
const unsigned int AP4_LINEAR_READER_INITIALIZED = 1;
const unsigned int AP4_LINEAR_READER_FLAG_EOS = 2;
const unsigned int AP4_LINEAR_READER_DEFAULT_BUFFER_SIZE = 16*1024*1024;
/*----------------------------------------------------------------------
| AP4_LinearReader
+---------------------------------------------------------------------*/
class AP4_LinearReader {
public:
AP4_LinearReader(AP4_Movie& movie, AP4_ByteStream* fragment_stream = NULL, AP4_Size max_buffer=AP4_LINEAR_READER_DEFAULT_BUFFER_SIZE);
virtual ~AP4_LinearReader();
AP4_Result EnableTrack(AP4_UI32 track_id);
/**
* Read the next sample in storage order, from any track.
* track_id is updated to reflect the track from which the sample was read.
*/
AP4_Result ReadNextSample(AP4_Sample& sample,
AP4_DataBuffer& sample_data,
AP4_UI32& track_id);
/**
* Get the next sample in storage order, without reading the sample data,
* from any track. track_id is updated to reflect the track from which the
* sample was read.
*/
AP4_Result GetNextSample(AP4_Sample& sample, AP4_UI32& track_id);
/**
* Read the next sample in storage order from a specific track.
*/
AP4_Result ReadNextSample(AP4_UI32 track_id,
AP4_Sample& sample,
AP4_DataBuffer& sample_data);
AP4_Result SetSampleIndex(AP4_UI32 track_id, AP4_UI32 sample_index);
AP4_Result SeekTo(AP4_UI32 time_ms, AP4_UI32* actual_time_ms = 0);
AP4_Result SeekSample(AP4_UI32 track_id, AP4_UI64 ts, AP4_Ordinal &sample_index, bool preceedingSync);
// accessors
AP4_Size GetBufferFullness() { return m_BufferFullness; }
// classes
class SampleReader {
public:
virtual ~SampleReader() {}
virtual AP4_Result ReadSampleData(AP4_Sample& sample, AP4_DataBuffer& sample_data) = 0;
};
protected:
class SampleBuffer {
public:
SampleBuffer(AP4_Sample* sample) : m_Sample(sample) {}
~SampleBuffer() { delete m_Sample; }
AP4_Sample* m_Sample;
AP4_DataBuffer m_Data;
};
class Tracker {
public:
Tracker(AP4_Track* track) :
m_Eos(false),
m_Track(track),
m_SampleTable(NULL),
m_SampleTableIsOwned(false),
m_NextSample(NULL),
m_NextSampleIndex(0),
m_NextDts(0),
m_Reader(NULL) {
m_SeekPoint.m_Pending = false;
m_SeekPoint.m_Time = 0;
m_SeekPoint.m_MoofOffset = 0;
m_SeekPoint.m_TrafNumber = 0;
m_SeekPoint.m_TrunNumber = 0;
m_SeekPoint.m_SampleNumber = 0;
}
Tracker(const Tracker& other) :
m_Eos(other.m_Eos),
m_Track(other.m_Track),
m_SampleTable(other.m_SampleTable),
m_SampleTableIsOwned(false),
m_NextSample(NULL),
m_NextSampleIndex(other.m_NextSampleIndex),
m_NextDts(other.m_NextDts),
m_Reader(other.m_Reader) {
m_SeekPoint = other.m_SeekPoint;
} // don't copy samples
~Tracker();
bool m_Eos;
AP4_Track* m_Track;
AP4_SampleTable* m_SampleTable;
bool m_SampleTableIsOwned;
AP4_Sample* m_NextSample;
AP4_Ordinal m_NextSampleIndex;
AP4_UI64 m_NextDts;
AP4_List<SampleBuffer> m_Samples;
SampleReader* m_Reader;
struct {
bool m_Pending;
AP4_UI64 m_Time;
AP4_Position m_MoofOffset;
unsigned int m_TrafNumber;
unsigned int m_TrunNumber;
unsigned int m_SampleNumber;
} m_SeekPoint;
};
// methods that can be overridden
virtual AP4_Result ProcessTrack(AP4_Track* track);
virtual AP4_Result ProcessMoof(AP4_ContainerAtom* moof,
AP4_Position moof_offset,
AP4_Position mdat_payload_offset,
AP4_UI64 mdat_payload_size);
// methods
Tracker* FindTracker(AP4_UI32 track_id);
AP4_Result Advance(bool read_data = true);
AP4_Result AdvanceFragment();
bool PopSample(Tracker* tracker, AP4_Sample& sample, AP4_DataBuffer* sample_data);
AP4_Result ReadNextSample(AP4_Sample& sample,
AP4_DataBuffer* sample_data,
AP4_UI32& track_id);
AP4_Result GetSample(AP4_UI32 track_id, AP4_Sample &sample, AP4_Ordinal sample_index);
void FlushQueue(Tracker* tracker);
void FlushQueues();
void Reset();
// members
AP4_Movie& m_Movie;
bool m_HasFragments;
AP4_MovieFragment* m_Fragment;
AP4_ByteStream* m_FragmentStream;
AP4_Position m_NextFragmentPosition;
AP4_Array<Tracker*> m_Trackers;
AP4_Size m_BufferFullness;
AP4_Size m_BufferFullnessPeak;
AP4_Size m_MaxBufferFullness;
AP4_ContainerAtom* m_Mfra;
};
/*----------------------------------------------------------------------
| AP4_DecryptingSampleReader
+---------------------------------------------------------------------*/
class AP4_DecryptingSampleReader : public AP4_LinearReader::SampleReader
{
public:
AP4_DecryptingSampleReader(AP4_SampleDecrypter* decrypter, bool transfer_ownership) :
m_DecrypterIsOwned(transfer_ownership),
m_Decrypter(decrypter) {}
virtual ~AP4_DecryptingSampleReader() {
if (m_DecrypterIsOwned) delete m_Decrypter;
}
virtual AP4_Result ReadSampleData(AP4_Sample& sample, AP4_DataBuffer& sample_data);
bool m_DecrypterIsOwned;
AP4_DataBuffer m_DataBuffer;
AP4_SampleDecrypter* m_Decrypter;
};
#endif // _AP4_LINEAR_READER_H_
|
