Created by the British Broadcasting Corporation.
Compresses a sequence of frames/fields from a stream. More...
#include <seq_compress.h>
Public Member Functions | |
SequenceCompressor (StreamPicInput *pin, EncoderParams &encp, DiracByteStream &dirac_byte_stream) | |
Constructor. | |
virtual | ~SequenceCompressor () |
Destructor. | |
virtual bool | LoadNextFrame ()=0 |
Load data. | |
const EncPicture * | CompressNextPicture () |
Compress the next picture in sequence. | |
virtual void | SetPicTypeAndRefs (PictureParams &pparams)=0 |
Set up the appropriate prediction parameters for a picture. | |
const EncPicture * | GetPictureEncoded () |
Return a pointer to the most recent picture encoded. | |
DiracByteStats | EndSequence () |
bool | Finished () |
Determine if compression is complete. | |
void | SignalEOS () |
Signal end of sequence. | |
int | PTSOffset () |
The delay required for correct timestamps. |
Protected Member Functions | |
void | SetMotionParameters () |
Set up the motion block parameters. | |
virtual int | CodedToDisplay (const int pnum)=0 |
Uses the GOP parameters to convert picture numbers in coded order to display order. | |
void | MakeSequenceReport () |
Make a report to screen on the coding results for the whole sequence. | |
virtual void | CleanBuffers () |
Remove unwanted pictures from picture buffers. | |
virtual void | UpdateCBRModel (EncPicture &my_picture, const PictureByteIO *picture_byteio)=0 |
Update the CBR model based on the data we've compressed. | |
void | UpdateIntraPicCBRModel (const PictureParams &, const bool is_a_cut) |
Update the parameters to be used in advance of coding an intra frame. | |
bool | CanEncode () |
Returns true if the encoder can encode a picture. |
Protected Attributes | |
bool | m_all_done |
Completion flag, returned via the Finished method. | |
bool | m_just_finished |
Flag indicating whether we've just finished. | |
OLBParams * | m_basic_olb_params0 |
A class to hold the basic block parameters. | |
OLBParams * | m_basic_olb_params1 |
A class to hold the basic block parameters. | |
const OLBParams * | m_basic_olb_params2 |
A class to hold the basic block parameters. | |
OLBParams * | m_intra_olbp |
A class to hold block parameters to use when there are lots of intra blocks. | |
SourceParams & | m_srcparams |
The parameters of the input source. | |
EncoderParams & | m_encparams |
The parameters used for encoding. | |
PicturePredParams & | m_predparams |
The parameters used for ME/MC. | |
int | m_L1_sep |
The L1 separation currently in use. | |
PictureParams | m_pparams |
Generic picture parameters for initialising pictures. | |
StreamPicInput * | m_pic_in |
Pointer pointing at the picture input. | |
EncQueue | m_enc_pbuffer |
A picture buffer used for local storage of pictures whilst pending re-ordering or being used for reference. | |
int | m_current_display_pnum |
The number of the current picture to be coded, in display order. | |
int | m_current_code_pnum |
The number of the current picture to be coded, in coded order. | |
int | m_show_pnum |
The number of the picture which should be output for concurrent display or storage. | |
int | m_last_picture_read |
The index, in display order, of the last picture read. | |
int | m_gop_start_num |
The picture number of the last GOP start. | |
int | m_delay |
A delay so that we don't display what we haven't coded. | |
QualityMonitor | m_qmonitor |
A class for monitoring the quality of pictures and adjusting parameters appropriately. | |
RateController * | m_ratecontrol |
A class for monitoring and controlling bit rate. | |
PictureCompressor | m_pcoder |
A class to hold the picture compressor object. | |
DiracByteStream & | m_dirac_byte_stream |
Output destination for compressed data in bitstream format. | |
bool | m_eos_signalled |
Flag to check if End of Sequence has been signalled by the end user. |
Private Member Functions | |
SequenceCompressor (const SequenceCompressor &cpy) | |
Copy constructor is private and body-less. | |
SequenceCompressor & | operator= (const SequenceCompressor &rhs) |
Assignment = is private and body-less. |
This class compresses a sequence of frames/fields, frame by frame. or field by field. It currently uses GOP parameters set in the encoder parameters in order to define the temporal prediction structure. A version to incorporate non-GOP structures is TBC.
This is an abstract class.
dirac::SequenceCompressor::SequenceCompressor | ( | StreamPicInput * | pin, |
EncoderParams & | encp, | ||
DiracByteStream & | dirac_byte_stream ) |
Creates a sequence compressor, and prepares to begin compressing with the first picture.Sets up picture padding in the picture input if necesary
pin | an input stream containing a sequence of frames |
encp | parameters for the encoding process |
dirac_byte_stream | Output destination for compressed data |
Referenced by operator=(), and SequenceCompressor().
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Destructor. Must delete IO objects created by constructor.
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Copy constructor is private and body-less. This class should not be copied.
References SequenceCompressor().
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Uses the GOP parameters to convert picture numbers in coded order to display order. Pure virtual function. The child class will have to define it.
pnum | the picture number in coded order |
Implemented in dirac::FieldSequenceCompressor, and dirac::FrameSequenceCompressor.
const EncPicture * dirac::SequenceCompressor::CompressNextPicture | ( | ) |
This function codes the next picture in coding order and returns the next picture in display order. In general these will differ, and because of re-ordering there is a delay which needs to be imposed. This creates problems at the start and at the end of the sequence which must be dealt with. At the start we just keep outputting picture 0. At the end you will need to loop for longer to get all the pictures out. It's up to the calling function to do something with the decoded pictures as they come out – write them to screen or to file, for example. . If coding is fast enough the compressed version could be watched real-time (with suitable buffering in the calling function to account for encode-time variations).
NOTE: LoadNextFrame must be called atleast once before invoking this method.
DiracByteStats dirac::SequenceCompressor::EndSequence | ( | ) |
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Indicates whether or not the last picture in the sequence has been compressed.
References m_all_done.
const EncPicture * dirac::SequenceCompressor::GetPictureEncoded | ( | ) |
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Load one picture of data into the Sequence Compressor. Sets m_all_done to true if no more data is available to be loaded. Input can be frame or field. So the child class will have to implement this function.
Implemented in dirac::FieldSequenceCompressor, and dirac::FrameSequenceCompressor.
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Assignment = is private and body-less. This class should not be assigned..
References SequenceCompressor().
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References m_delay.
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Implemented in dirac::FieldSequenceCompressor, and dirac::FrameSequenceCompressor.
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References m_eos_signalled.
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Implemented in dirac::FieldSequenceCompressor, and dirac::FrameSequenceCompressor.
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Referenced by Finished().
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Referenced by PTSOffset().
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Referenced by SignalEOS().
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Flag which is false if we've been all-done for more than one picture, true otherwise (so that we can take actions on finishing once only).
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© 2004 British Broadcasting Corporation.
Dirac code licensed under the Mozilla Public License (MPL) Version 1.1.
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