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iec13818-2.cc
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iec13818-2.cc
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/*
* iec13818-2.cc
* Copyright (C) 2007 Dan Streetman <ddstreet@ieee.org>
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <string>
using std::string;
#include "hdvframe.h"
#include "iec13818-2.h"
///////////////
// Video Stream
Video::Video()
{
picture = new Picture( this );
sequenceHeader = new SequenceHeader( this );
sequenceExtension = new SequenceExtension( this );
sequenceDisplayExtension = new SequenceDisplayExtension( this );
quantMatrixExtension = new QuantMatrixExtension( this );
copyrightExtension = new CopyrightExtension( this );
sequenceScalableExtension = new SequenceScalableExtension( this );
pictureDisplayExtension = new PictureDisplayExtension( this );
pictureCodingExtension = new PictureCodingExtension( this );
pictureSpatialScalableExtension = new PictureSpatialScalableExtension( this );
pictureTemporalScalableExtension = new PictureTemporalScalableExtension( this );
userData = new UserData( this );
group = new Group( this );
slice = new Slice( this );
Clear();
}
Video::~Video()
{
delete picture;
delete sequenceHeader;
delete sequenceExtension;
delete sequenceDisplayExtension;
delete quantMatrixExtension;
delete copyrightExtension;
delete sequenceScalableExtension;
delete pictureDisplayExtension;
delete pictureCodingExtension;
delete pictureSpatialScalableExtension;
delete pictureTemporalScalableExtension;
delete userData;
delete group;
delete slice;
}
void Video::AddPacket( HDVPacket *packet )
{
if ( offset > 0 && packet->payload_unit_start_indicator() )
{
if ( lastSection == slice )
DEBUG_RAW( d_hdv_video, "*%d", sliceCount );
DEBUG_RAW( d_hdv_video, "]" );
isComplete = true;
}
else
{
pes.AddData( packet->payload(), packet->PayloadLength() );
ProcessPacket();
}
}
void Video::Clear()
{
pes.Clear();
currentSection = 0;
lastSection = 0;
sliceCount = 0;
offset = 0;
sectionStart = 0;
width = 0;
height = 0;
frameRate = 0;
isTimeCodeSet = false;
hasGOP = false;
repeat_first_field = -1;
top_field_first = -1;
picture_structure = -1;
progressive_sequence = -1;
scalable_mode = -1;
isComplete = false;
}
unsigned char *Video::GetBuffer() { return &pes.GetBuffer()[pes.GetPacketDataOffset()]; }
unsigned char Video::GetData( int pos )
{
if ( pos < pes.GetPacketDataLength() )
return pes.PES_packet_data_byte( pos );
else
return 0;
}
int Video::GetLength()
{
return pes.GetPacketDataLength();
}
bool Video::IsComplete()
{
return isComplete;
}
void Video::ProcessPacket()
{
while ( ( offset + 4 ) < GetLength() )
{
int currentLen = GetLength() - offset;
if ( !currentSection )
{
const char *dstr = NULL;
bool restart = false;
if ( START_CODE_PREFIX( offset ) )
{
int start_code = GetData( offset + 3 );
int extension_code;
switch ( start_code )
{
case SEQUENCE_HEADER_CODE_VALUE:
dstr = "H";
currentSection = sequenceHeader;
break;
case PICTURE_START_CODE_VALUE:
dstr = "P";
currentSection = picture;
break;
case EXTENSION_START_CODE_VALUE:
extension_code = GetBits( ( offset + 4 ) * 8, 4 );
switch ( extension_code )
{
case SEQUENCE_EXTENSION_ID_VALUE:
dstr = "SE";
currentSection = sequenceExtension;
break;
case SEQUENCE_DISPLAY_EXTENSION_ID_VALUE:
dstr = "SDE";
currentSection = sequenceDisplayExtension;
break;
case QUANT_MATRIX_EXTENSION_ID_VALUE:
dstr = "QME";
currentSection = quantMatrixExtension;
break;
case COPYRIGHT_EXTENSION_ID_VALUE:
dstr = "CE";
currentSection = copyrightExtension;
break;
case SEQUENCE_SCALABLE_EXTENSION_ID_VALUE:
dstr = "SSE";
currentSection = sequenceScalableExtension;
break;
case PICTURE_DISPLAY_EXTENSION_ID_VALUE:
dstr = "PDE";
currentSection = pictureDisplayExtension;
break;
case PICTURE_CODING_EXTENSION_ID_VALUE:
dstr = "PCE";
currentSection = pictureCodingExtension;
break;
case PICTURE_SPATIAL_SCALABLE_EXTENSION_ID_VALUE:
dstr = "PSSE";
currentSection = pictureSpatialScalableExtension;
break;
case PICTURE_TEMPORAL_SCALABLE_EXTENSION_ID_VALUE:
dstr = "PTSE";
currentSection = pictureTemporalScalableExtension;
break;
default:
DEBUG( d_hdv_video, "Unknown Extension %x", extension_code );
offset++;
restart = true;
break;
}
break;
case USER_DATA_START_CODE_VALUE:
dstr = "U";
currentSection = userData;
break;
case GROUP_START_CODE_VALUE:
dstr = "G";
currentSection = group;
break;
case SEQUENCE_END_CODE_VALUE:
dstr = "END";
offset += 4;
restart = true;
break;
default:
if ( SLICE_START_CODE_MIN <= start_code && start_code <= SLICE_START_CODE_MAX )
{
if ( lastSection == slice )
{
sliceCount++;
}
else
{
dstr = "S";
sliceCount = 1;
}
currentSection = slice;
}
else
{
DEBUG( d_hdv_video, "Unknown Start Code %x", start_code );
offset++;
restart = true;
}
break;
}
}
else
{
DEBUG_RAW( d_hdv_video, "%02x ", GetData(offset) );
offset++;
restart = true;
}
if ( dstr )
{
if ( lastSection == slice && currentSection != slice )
DEBUG_RAW( d_hdv_video, "*%d]", sliceCount );
DEBUG_RAW( d_hdv_video, "[%s", dstr );
if ( restart )
DEBUG_RAW( d_hdv_video, "]" );
}
if ( restart )
continue;
currentSection->Clear();
currentSection->SetOffset( offset );
sectionStart = offset;
}
currentSection->AddLength( currentLen );
if ( currentSection->IsComplete() )
{
if ( currentSection != slice )
DEBUG_RAW( d_hdv_video, "]" );
if ( currentSection == sequenceHeader )
{
width = sequenceHeader->horizontal_size_value();
height = sequenceHeader->vertical_size_value();
frameRate = FRAMERATE_LOOKUP( sequenceHeader->frame_rate_code() );
}
else if ( currentSection == pictureCodingExtension )
{
repeat_first_field = pictureCodingExtension->repeat_first_field() ? 1 : 0;
top_field_first = pictureCodingExtension->top_field_first() ? 1 : 0;
picture_structure = pictureCodingExtension->picture_structure();
}
else if ( currentSection == group )
{
timeCode.hour = group->time_code_hours();
timeCode.min = group->time_code_minutes();
timeCode.sec = group->time_code_seconds();
timeCode.frame = group->time_code_pictures();
isTimeCodeSet = true;
hasGOP = true;
}
else if ( currentSection == sequenceExtension )
progressive_sequence = sequenceExtension->progressive_sequence() ? 1 : 0;
else if ( currentSection == sequenceScalableExtension )
scalable_mode = sequenceScalableExtension->scalable_mode();
currentLen = currentSection->GetCompleteLength() - ( offset - sectionStart );
lastSection = currentSection;
currentSection = 0;
}
offset += currentLen;
}
}
///////////////
// VideoSection
VideoSection::VideoSection( Video *v )
{
video = v;
}
VideoSection::~VideoSection()
{
}
void VideoSection::Clear()
{
offset = 0;
length = 0;
}
void VideoSection::SetOffset( int o ) { offset = o; }
void VideoSection::AddLength( int l ) { length += l; }
bool VideoSection::IsComplete() { return GetCompleteLength() > 0; }
unsigned char VideoSection::GetData( int pos ) { return video->GetData( pos + offset ); }
//////////
// Picture
Picture::Picture( Video *v ) : VideoSection( v )
{
}
Picture::~Picture()
{
}
int Picture::GetCompleteLength()
{
int blen = length * 8;
int bits = 61;
if ( blen < bits )
return -1;
if ( picture_coding_type() == 2 )
bits += 4;
else if ( picture_coding_type() == 3 )
bits += 8;
if ( blen < bits )
return -1;
while ( GetBits( bits, 1 ) )
{
bits += 9;
if ( blen < bits )
return -1;
}
return TOBYTES( bits );
}
void Picture::Dump()
{
DEBUG( d_hdv_video, "Picture section" );
}
unsigned int Picture::picture_start_code() { return GetBits( 0, 32 ); }
unsigned short Picture::temporal_reference() { return GetBits( 32, 10 ); }
unsigned char Picture::picture_coding_type() { return GetBits( 42, 3 ); }
unsigned short Picture::vbv_delay() { return GetBits( 45, 16 ); }
bool Picture::full_pel_forward_vector()
{
if ( picture_coding_type() == 2 || picture_coding_type() == 3 )
return GetBits( 61, 1 );
else
return 0;
}
unsigned char Picture::forward_f_code()
{
if ( picture_coding_type() == 2 || picture_coding_type() == 3 )
return GetBits( 62, 3 );
else
return 0;
}
bool Picture::full_pel_backward_vector()
{
if ( picture_coding_type() == 3 )
return GetBits( 65, 1 );
else
return 0;
}
unsigned char Picture::backward_f_code()
{
if ( picture_coding_type() == 3 )
return GetBits( 66, 3 );
else
return 0;
}
unsigned char Picture::extra_information_picture( int n )
{
int bits = 61;
int i = 0;
if ( picture_coding_type() == 2 )
bits += 4;
else if ( picture_coding_type() == 3 )
bits += 8;
while ( GetBits( bits, 1 ) )
{
if ( n == i )
return GetBits( bits + 1, 8 );
bits += 9;
i++;
}
return 0;
}
//////////////////
// Sequence Header
SequenceHeader::SequenceHeader( Video *v ) : VideoSection( v )
{
}
SequenceHeader::~SequenceHeader()
{
}
int SequenceHeader::GetCompleteLength()
{
int blen = length * 8;
int bits = 95;
if ( blen < bits )
return -1;
if ( load_intra_quantiser_matrix() )
bits += 512;
bits += 1;
if ( blen < bits )
return -1;
if ( load_non_intra_quantiser_matrix() )
bits += 512;
if ( blen < bits )
return -1;
return TOBYTES( bits );
}
void SequenceHeader::Dump()
{
DEBUG( d_hdv_video, "SequenceHeader section H %d V %d aspect %d rate %d bitrate %d",
horizontal_size_value(), vertical_size_value(), aspect_ratio_information(), frame_rate_code(), bit_rate_value() );
}
unsigned int SequenceHeader::sequence_header_code() { return GetBits( 0, 32 ); }
unsigned short SequenceHeader::horizontal_size_value() { return GetBits( 32, 12 ); }
unsigned short SequenceHeader::vertical_size_value() { return GetBits( 44, 12 ); }
unsigned char SequenceHeader::aspect_ratio_information() { return GetBits( 56, 4 ); }
unsigned char SequenceHeader::frame_rate_code() { return GetBits( 60, 4 ); }
unsigned int SequenceHeader::bit_rate_value() { return GetBits( 64, 18 ); }
unsigned short SequenceHeader::vbv_buffer_size_value() { return GetBits( 83, 10 ); }
bool SequenceHeader::constrained_parameters_flag() { return GetBits( 93, 1 ); }
bool SequenceHeader::load_intra_quantiser_matrix() { return GetBits( 94, 1 ); }
unsigned char SequenceHeader::intra_quantiser_matrix( unsigned int n )
{
if ( load_intra_quantiser_matrix() && n < 64 )
return GetBits( 95 + ( n * 8 ), 8 );
else
return 0;
}
bool SequenceHeader::load_non_intra_quantiser_matrix()
{
return load_intra_quantiser_matrix() ? GetBits( 607, 1 ) : GetBits( 95, 1 );
}
unsigned char SequenceHeader::non_intra_quantiser_matrix( unsigned int n )
{
if ( load_non_intra_quantiser_matrix() && n < 64 )
return load_intra_quantiser_matrix() ? GetBits( 608 + ( n * 8 ), 8 ) : GetBits( 96 + ( n * 8 ), 8 );
else
return 0;
}
////////////////////
// SequenceExtension
SequenceExtension::SequenceExtension( Video *v ) : VideoSection( v )
{
}
SequenceExtension::~SequenceExtension()
{
}
int SequenceExtension::GetCompleteLength()
{
int blen = length * 8;
int bits = 80;
if ( blen < bits )
return -1;
return TOBYTES( bits );
}
void SequenceExtension::Dump()
{
DEBUG( d_hdv_video, "SequenceExtension section" );
}
unsigned int SequenceExtension::extension_start_code() { return GetBits( 0, 32 ); }
unsigned char SequenceExtension::extension_start_code_identifier() { return GetBits( 32, 4 ); }
unsigned char SequenceExtension::profile_and_level_indication() { return GetBits( 36, 8 ); }
bool SequenceExtension::progressive_sequence() { return GetBits( 44, 1 ); }
unsigned char SequenceExtension::chroma_format() { return GetBits( 45, 2 ); }
unsigned char SequenceExtension::horizontal_size_extension() { return GetBits( 47, 2 ); }
unsigned char SequenceExtension::vertical_size_extension() { return GetBits( 49, 2 ); }
unsigned short SequenceExtension::bit_rate_extension() { return GetBits( 51, 12 ); }
unsigned char SequenceExtension::vbv_buffer_size_extension() { return GetBits( 64, 8 ); }
bool SequenceExtension::low_delay() { return GetBits( 72, 1 ); }
unsigned char SequenceExtension::frame_rate_extension_n() { return GetBits( 73, 2 ); }
unsigned char SequenceExtension::frame_rate_extension_d() { return GetBits( 75, 5 ); }
///////////////////////////
// SequenceDisplayExtension
SequenceDisplayExtension::SequenceDisplayExtension( Video *v ) : VideoSection( v )
{
}
SequenceDisplayExtension::~SequenceDisplayExtension()
{
}
int SequenceDisplayExtension::GetCompleteLength()
{
int blen = length * 8;
int bits = 40;
if ( blen < bits )
return -1;
if ( colour_description() )
bits += 24;
if ( blen < bits )
return -1;
bits += 29;
if ( blen < bits )
return -1;
return TOBYTES( bits );
}
void SequenceDisplayExtension::Dump()
{
DEBUG( d_hdv_video, "SequenceDisplayExtension section" );
}
unsigned int SequenceDisplayExtension::extension_start_code() { return GetBits( 0, 32 ); }
unsigned char SequenceDisplayExtension::extension_start_code_identifier() { return GetBits( 32, 4 ); }
unsigned char SequenceDisplayExtension::video_format() { return GetBits( 36, 3 ); }
bool SequenceDisplayExtension::colour_description() { return GetBits( 39, 1 ); }
unsigned char SequenceDisplayExtension::colour_primaries() { return colour_description() ? GetBits( 40, 8 ) : 0; }
unsigned char SequenceDisplayExtension::transfer_characteristics() { return colour_description() ? GetBits( 48, 8 ) : 0; }
unsigned char SequenceDisplayExtension::matrix_coefficients() { return colour_description() ? GetBits( 56, 8 ) : 0; }
unsigned short SequenceDisplayExtension::display_horizontal_size()
{
return colour_description() ? GetBits( 64, 14 ) : GetBits( 40, 14 );
}
bool SequenceDisplayExtension::marker_bit()
{
return colour_description() ? GetBits( 78, 1 ) : GetBits( 54, 1 );
}
unsigned short SequenceDisplayExtension::display_vertical_size()
{
return colour_description() ? GetBits( 79, 14 ) : GetBits( 55, 14 );
}
///////////////////////
// QuantMatrixExtension
QuantMatrixExtension::QuantMatrixExtension( Video *v ) : VideoSection( v )
{
}
QuantMatrixExtension::~QuantMatrixExtension()
{
}
int QuantMatrixExtension::GetCompleteLength()
{
int blen = length * 8;
int bits = 37;
if ( blen < bits )
return -1;
if ( load_intra_quantiser_matrix() )
bits += 512;
bits += 1;
if ( blen < bits )
return -1;
if ( load_non_intra_quantiser_matrix() )
bits += 512;
bits += 1;
if ( blen < bits )
return -1;
if ( load_chroma_intra_quantiser_matrix() )
bits += 512;
bits += 1;
if ( blen < bits )
return -1;
if ( load_chroma_non_intra_quantiser_matrix() )
bits += 512;
if ( blen < bits )
return -1;
return TOBYTES( bits );
}
void QuantMatrixExtension::Dump()
{
DEBUG( d_hdv_video, "QuantMatrixExtension section" );
}
unsigned int QuantMatrixExtension::extension_start_code() { return GetBits( 0, 32 ); }
unsigned char QuantMatrixExtension::extension_start_code_identifier() { return GetBits( 32, 4 ); }
bool QuantMatrixExtension::load_intra_quantiser_matrix() { return GetBits( 36, 1 ); }
unsigned char QuantMatrixExtension::intra_quantiser_matrix( unsigned int n )
{
int pos = 37;
if ( load_intra_quantiser_matrix() && n < 64 )
return GetBits( pos + ( 8 * n ), 8 );
else
return 0;
}
bool QuantMatrixExtension::load_non_intra_quantiser_matrix()
{
int pos = 37;
if ( load_intra_quantiser_matrix() )
pos += 512;
return GetBits( pos, 1 );
}
unsigned char QuantMatrixExtension::non_intra_quantiser_matrix( unsigned int n )
{
int pos = 38;
if ( load_intra_quantiser_matrix() )
pos += 512;
if ( load_non_intra_quantiser_matrix() && n < 64 )
return GetBits( pos + ( 8 * n ), 8 );
else
return 0;
}
bool QuantMatrixExtension::load_chroma_intra_quantiser_matrix()
{
int pos = 38;
if ( load_intra_quantiser_matrix() )
pos += 512;
if ( load_non_intra_quantiser_matrix() )
pos += 512;
return GetBits( pos, 1 );
}
unsigned char QuantMatrixExtension::chroma_intra_quantiser_matrix( unsigned int n )
{
int pos = 39;
if ( load_intra_quantiser_matrix() )
pos += 512;
if ( load_non_intra_quantiser_matrix() )
pos += 512;
if ( load_chroma_intra_quantiser_matrix() && n < 64 )
return GetBits( pos + ( 8 * n ), 8 );
else
return 0;
}
bool QuantMatrixExtension::load_chroma_non_intra_quantiser_matrix()
{
int pos = 39;
if ( load_intra_quantiser_matrix() )
pos += 512;
if ( load_non_intra_quantiser_matrix() )
pos += 512;
if ( load_chroma_intra_quantiser_matrix() )
pos += 512;
return GetBits( pos, 1 );
}
unsigned char QuantMatrixExtension::chroma_non_intra_quantiser_matrix( unsigned int n )
{
int pos = 40;
if ( load_intra_quantiser_matrix() )
pos += 512;
if ( load_non_intra_quantiser_matrix() )
pos += 512;
if ( load_chroma_intra_quantiser_matrix() )
pos += 512;
if ( load_chroma_non_intra_quantiser_matrix() && n < 64 )
return GetBits( pos + ( 8 * n ), 8 );
else
return 0;
}
/////////////////////
// CopyrightExtension
CopyrightExtension::CopyrightExtension( Video *v ) : VideoSection( v )
{
}
CopyrightExtension::~CopyrightExtension()
{
}
int CopyrightExtension::GetCompleteLength()
{
int blen = length * 8;
int bits = 110;
if ( blen < bits )
return -1;
return TOBYTES( bits );
}
void CopyrightExtension::Dump()
{
DEBUG( d_hdv_video, "CopyrightExtension section" );
}
unsigned int CopyrightExtension::extension_start_code() { return GetBits( 0, 32 ); }
unsigned char CopyrightExtension::extension_start_code_identifier() { return GetBits( 32, 4 ); }
bool CopyrightExtension::copyright_flag() { return GetBits( 36, 1 ); }
unsigned char CopyrightExtension::copyright_identifier() { return GetBits( 37, 8 ); }
bool CopyrightExtension::original_or_copy() { return GetBits( 45, 1 ); }
unsigned int CopyrightExtension::copyright_number_1() { return GetBits( 54, 20 ); }
unsigned int CopyrightExtension::copyright_number_2() { return GetBits( 65, 22 ); }
unsigned int CopyrightExtension::copyright_number_3() { return GetBits( 88, 22 ); }
////////////////////////////
// SequenceScalableExtension
SequenceScalableExtension::SequenceScalableExtension( Video *v ) : VideoSection( v )
{
}
SequenceScalableExtension::~SequenceScalableExtension()
{
}
int SequenceScalableExtension::GetCompleteLength()
{
int blen = length * 8;
int bits = 42;
if ( blen < bits )
return -1;
if ( scalable_mode() == SPATIAL_SCALABILITY )
{
bits += 48;
}
else if ( scalable_mode() == TEMPORAL_SCALABILITY )
{
bits += 1;
if ( blen < bits )
return -1;
if ( picture_mux_enable() )
bits += 1;
bits += 6;
}
if ( blen < bits )
return -1;
return TOBYTES( bits );
}
void SequenceScalableExtension::Dump()
{
DEBUG( d_hdv_video, "SequenceScalableExtension section" );
}
unsigned int SequenceScalableExtension::extension_start_code() { return GetBits( 0, 32 ); }
unsigned char SequenceScalableExtension::extension_start_code_identifier() { return GetBits( 32, 4 ); }
unsigned char SequenceScalableExtension::scalable_mode() { return GetBits( 36, 2 ); }
unsigned char SequenceScalableExtension::layer_id() { return GetBits( 38, 4 ); }
unsigned short SequenceScalableExtension::lower_layer_prediction_horizontal_size()
{
return scalable_mode() == SPATIAL_SCALABILITY ? GetBits( 42, 14 ) : 0;
}
unsigned short SequenceScalableExtension::lower_layer_prediction_vertical_size()
{
return scalable_mode() == SPATIAL_SCALABILITY ? GetBits( 57, 14 ) : 0;
}
unsigned char SequenceScalableExtension::horizontal_subsampling_factor_m()
{
return scalable_mode() == SPATIAL_SCALABILITY ? GetBits( 71, 5 ) : 0;
}
unsigned char SequenceScalableExtension::horizontal_subsampling_factor_n()
{
return scalable_mode() == SPATIAL_SCALABILITY ? GetBits( 76, 5 ) : 0;
}
unsigned char SequenceScalableExtension::vertical_subsampling_factor_m()
{
return scalable_mode() == SPATIAL_SCALABILITY ? GetBits( 81, 5 ) : 0;
}
unsigned char SequenceScalableExtension::vertical_subsampling_factor_n()
{
return scalable_mode() == SPATIAL_SCALABILITY ? GetBits( 86, 5 ) : 0;
}
bool SequenceScalableExtension::picture_mux_enable()
{
return scalable_mode() == TEMPORAL_SCALABILITY ? GetBits( 42, 1 ) : 0;
}
bool SequenceScalableExtension::mux_to_progressive_sequence()
{
if ( scalable_mode() == TEMPORAL_SCALABILITY )
return picture_mux_enable() ? GetBits( 43, 1 ) : 0;
else
return 0;
}
unsigned char SequenceScalableExtension::picture_mux_order()
{
if ( scalable_mode() == TEMPORAL_SCALABILITY )
return picture_mux_enable() ? GetBits( 44, 3 ) : GetBits( 43, 3 );
else
return 0;
}
unsigned char SequenceScalableExtension::picture_mux_factor()
{
if ( scalable_mode() == TEMPORAL_SCALABILITY )
return picture_mux_enable() ? GetBits( 47, 3 ) : GetBits( 46, 3 );
else
return 0;
}
//////////////////////////
// PictureDisplayExtension
PictureDisplayExtension::PictureDisplayExtension( Video *v ) : VideoSection( v )
{
}
PictureDisplayExtension::~PictureDisplayExtension()
{
}
int PictureDisplayExtension::GetCompleteLength()
{
int blen = length * 8;
int bits = 36;
if ( blen < bits )
return -1;
bits += 34 * number_of_frame_centre_offsets();
if ( blen < bits )
return -1;
return TOBYTES( bits );
}
void PictureDisplayExtension::Dump()
{
DEBUG( d_hdv_video, "PictureDisplayExtension section" );
}
unsigned int PictureDisplayExtension::extension_start_code() { return GetBits( 0, 32 ); }
unsigned char PictureDisplayExtension::extension_start_code_identifier() { return GetBits( 32, 4 ); }
unsigned short PictureDisplayExtension::frame_centre_horizontal_offset( unsigned int n )
{
if ( n < number_of_frame_centre_offsets() )
return GetBits( 36 + ( n * 34 ), 16 );
else
return 0;
}
unsigned short PictureDisplayExtension::frame_centre_vertical_offset( unsigned int n )
{
if ( n < number_of_frame_centre_offsets() )
return GetBits( 53 + ( n * 34 ), 16 );
else
return 0;
}
unsigned char PictureDisplayExtension::number_of_frame_centre_offsets()
{
// These should be set in the stream before this, but if not return the minimum.
if ( video->progressive_sequence < 0 || video->repeat_first_field < 0 ||
video->top_field_first < 0 || video->picture_structure < 0 )
return 1;
bool picture_structure_is_field = video->picture_structure == PICTURE_STRUCTURE_TOP_FIELD ||
video->picture_structure == PICTURE_STRUCTURE_BOTTOM_FIELD;
// Straight from the spec. Ick.
if ( video->progressive_sequence == 1 ) {
if ( video->repeat_first_field == 1 ) {
if ( video->top_field_first == 1 )
return 3;
else
return 2;
} else {
return 1;
}
} else {
if ( picture_structure_is_field ) {
return 1;
} else {
if ( video->repeat_first_field == 1 )
return 3;
else
return 2;
}
}
}
/////////////////////////
// PictureCodingExtension
PictureCodingExtension::PictureCodingExtension( Video *v ) : VideoSection( v )
{
}
PictureCodingExtension::~PictureCodingExtension()
{
}
int PictureCodingExtension::GetCompleteLength()
{
int blen = length * 8;
int bits = 66;