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mpeg2.syntax
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__predefined
{
picture_start_code = __const, __bit_length (32), 0x100;
slice_start_code = __const, __bit_length (32), 0x101 through 0x1af;
reserved_B0 = __const, __bit_length (32), 0x1b0;
reserved_B1 = __const, __bit_length (32), 0x1b1;
user_data_start_code = __const, __bit_length (32), 0x1b2;
sequence_header_code = __const, __bit_length (32), 0x1b3;
sequence_error_code = __const, __bit_length (32), 0x1b4;
extension_start_code = __const, __bit_length (32), 0x1b5;
reserved_B6 = __const, __bit_length (32), 0x1b6;
sequence_end_code = __const, __bit_length (32), 0x1b7;
group_start_code = __const, __bit_length (32), 0x1b8;
system_start_codes = __const, __bit_length (32), 0x1b9 through 0x1ff;
next_start_code = __no_print;
bytealigned = __no_print;
nextbits = __no_print;
slice = __no_print;
/*picture_data = __no_print;*/
f_code = __array_data_type_byte, __array_size (2, 2);
vertical_size = 0/*__vertical_size ()*/;
}
__vertical_size ()
{
if (__stream_defined ("sequence_extension"))
return (sequence_header.vertical_size_value +
(sequence_extension.vertical_size_extension*1024*4))
else
return (sequence_header.vertical_size_value)
}
start_parser()
{
video_sequence ()
}
next_start_code() {
while ( !bytealigned() )
mpeg2_bitsdesc (zero_bit, 1, "0")
while ( nextbits() != "0000 0000 0000 0000 0000 0001" )
mpeg2_bitsdesc (zero_byte, 8, "0000 0000")
}
video_sequence() {
next_start_code()
sequence_header()
if ( nextbits() == extension_start_code ) {
sequence_extension()
do {
extension_and_user_data( 0 )
do {
if (nextbits() == group_start_code) {
group_of_pictures_header()
extension_and_user_data( 1 )
}
picture_header()
picture_coding_extension()
extension_and_user_data( 2 )
picture_data()
} while ( (nextbits() == picture_start_code) ||
(nextbits() == group_start_code) )
if ( nextbits() != sequence_end_code ) {
sequence_header()
sequence_extension()
}
} while ( nextbits() != sequence_end_code )
} else {
}
mpeg2_bitsdesc (sequence_end_code, 32, bslbf)
}
sequence_header() {
mpeg2_bitsdesc (sequence_header_code, 32, bslbf)
mpeg2_bitsdesc (horizontal_size_value, 12, uimsbf)
mpeg2_bitsdesc (vertical_size_value, 12, uimsbf)
mpeg2_bitsdesc (aspect_ratio_information, 4, uimsbf)
mpeg2_bitsdesc (frame_rate_code, 4, uimsbf)
mpeg2_bitsdesc (bit_rate_value, 18, uimsbf)
mpeg2_bitsdesc (marker_bit, 1, bslbf)
mpeg2_bitsdesc (vbv_buffer_size_value, 10, uimsbf)
mpeg2_bitsdesc (constrained_parameters_flag, 1, bslbf)
mpeg2_bitsdesc (load_intra_quantiser_matrix, 1, uimsbf)
if ( load_intra_quantiser_matrix )
mpeg2_bitsdesc (intra_quantiser_matrix[64], 8*64, uimsbf)
mpeg2_bitsdesc (load_non_intra_quantiser_matrix, 1, uimsbf)
if ( load_non_intra_quantiser_matrix )
mpeg2_bitsdesc (non_intra_quantiser_matrix[64], 8*64, uimsbf)
next_start_code()
}
extension_and_user_data( i ) {
while ( ( nextbits()== extension_start_code ) ||
( nextbits()== user_data_start_code ) ) {
if ( ( i != 1) && ( nextbits()== extension_start_code ) )
extension_data( i )
if ( nextbits()== user_data_start_code )
user_data()
}
}
extension_data( i ) {
while ( nextbits()== extension_start_code ) {
mpeg2_bitsdesc (extension_start_code, 32, bslbf)
if (i == 0) {
if ( nextbits()== “Sequence Display Extension ID” )
sequence_display_extension()
else
sequence_scalable_extension()
}
/* NOTE - i never takes the value 1 because extension_data()
never follows a group_of_pictures_header() */
if (i == 2) {
if ( nextbits() == “Quant Matrix Extension ID” )
quant_matrix_extension()
else if ( nextbits() == “Copyright Extension ID” )
copyright_extension()
else if ( nextbits() == “Picture Display Extension ID” )
picture_display_extension()
else if ( nextbits()
== “Picture Spatial Scalable Extension ID” )
picture_spatial_scalable_extension()
else
picture_temporal_scalable_extension()
}
}
}
user_data() {
mpeg2_bitsdesc (user_data_start_code, 32, bslbf)
while( nextbits() != "0000 0000 0000 0000 0000 0001" ) {
mpeg2_bitsdesc (user_data, 8, uimsbf)
}
next_start_code()
}
sequence_extension() {
mpeg2_bitsdesc (extension_start_code, 32, bslbf)
mpeg2_bitsdesc (extension_start_code_identifier, 4, uimsbf)
mpeg2_bitsdesc (profile_and_level_indication, 8, uimsbf)
mpeg2_bitsdesc (progressive_sequence, 1, uimsbf)
mpeg2_bitsdesc (chroma_format, 2, uimsbf)
mpeg2_bitsdesc (horizontal_size_extension, 2, uimsbf)
mpeg2_bitsdesc (vertical_size_extension, 2, uimsbf)
mpeg2_bitsdesc (bit_rate_extension, 12, uimsbf)
mpeg2_bitsdesc (marker_bit, 1, bslbf)
mpeg2_bitsdesc (vbv_buffer_size_extension, 8, uimsbf)
mpeg2_bitsdesc (low_delay, 1, uimsbf)
mpeg2_bitsdesc (frame_rate_extension_n, 2, uimsbf)
mpeg2_bitsdesc (frame_rate_extension_d, 5, uimsbf)
next_start_code()
}
sequence_display_extension() {
mpeg2_bitsdesc (extension_start_code_identifier, 4, uimsbf)
mpeg2_bitsdesc (video_format, 3, uimsbf)
mpeg2_bitsdesc (colour_description, 1, uimsbf)
if ( colour_description ) {
mpeg2_bitsdesc (colour_primaries, 8, uimsbf)
mpeg2_bitsdesc (transfer_characteristics, 8, uimsbf)
mpeg2_bitsdesc (matrix_coefficients, 8, uimsbf)
}
mpeg2_bitsdesc (display_horizontal_size, 14, uimsbf)
mpeg2_bitsdesc (marker_bit, 1, bslbf)
mpeg2_bitsdesc (display_vertical_size, 14, uimsbf)
next_start_code()
}
sequence_scalable_extension() {
mpeg2_bitsdesc (extension_start_code_identifier, 4, uimsbf)
mpeg2_bitsdesc (scalable_mode, 2, uimsbf)
mpeg2_bitsdesc (layer_id, 4, uimsbf)
if (scalable_mode == “spatial scalability”) {
mpeg2_bitsdesc (lower_layer_prediction_horizontal_size, 14, uimsbf)
mpeg2_bitsdesc (marker_bit, 1, bslbf)
mpeg2_bitsdesc (lower_layer_prediction_vertical_size, 14, uimsbf)
mpeg2_bitsdesc (horizontal_subsampling_factor_m, 5, uimsbf)
mpeg2_bitsdesc (horizontal_subsampling_factor_n, 5, uimsbf)
mpeg2_bitsdesc (vertical_subsampling_factor_m, 5, uimsbf)
mpeg2_bitsdesc (vertical_subsampling_factor_n, 5, uimsbf)
}
if ( scalable_mode == “temporal scalability” ) {
mpeg2_bitsdesc (picture_mux_enable, 1, uimsbf)
if ( picture_mux_enable )
mpeg2_bitsdesc (mux_to_progressive_sequence, 1, uimsbf)
mpeg2_bitsdesc (picture_mux_order, 3, uimsbf)
mpeg2_bitsdesc (picture_mux_factor, 3, uimsbf)
}
next_start_code()
}
group_of_pictures_header() {
mpeg2_bitsdesc (group_start_code, 32, bslbf)
mpeg2_bitsdesc (time_code, 25, bslbf)
mpeg2_bitsdesc (closed_gop, 1, uimsbf)
mpeg2_bitsdesc (broken_link, 1, uimsbf)
next_start_code()
}
picture_header() {
mpeg2_bitsdesc (picture_start_code, 32, bslbf)
mpeg2_bitsdesc (temporal_reference, 10, uimsbf)
mpeg2_bitsdesc (picture_coding_type, 3, uimsbf)
mpeg2_bitsdesc (vbv_delay, 16, uimsbf)
if ( picture_coding_type == 2 || picture_coding_type == 3) {
mpeg2_bitsdesc (full_pel_forward_vector, 1, bslbf)
mpeg2_bitsdesc (forward_f_code, 3, bslbf)
}
if ( picture_coding_type == 3 ) {
mpeg2_bitsdesc (full_pel_backward_vector, 1, bslbf)
mpeg2_bitsdesc (backward_f_code, 3, bslbf)
}
while ( nextbits() == "1" ) {
mpeg2_bitsdesc (extra_bit_picture, 1, uimsbf)
mpeg2_bitsdesc (extra_information_picture, 8, uimsbf)
}
mpeg2_bitsdesc (extra_bit_picture, 1, uimsbf)
next_start_code()
}
picture_coding_extension() {
mpeg2_bitsdesc (extension_start_code, 32, bslbf)
mpeg2_bitsdesc (extension_start_code_identifier, 4, uimsbf)
mpeg2_bitsdesc (f_code[0][0], 4, uimsbf)
mpeg2_bitsdesc (f_code[0][1], 4, uimsbf)
mpeg2_bitsdesc (f_code[1][0], 4, uimsbf)
mpeg2_bitsdesc (f_code[1][1], 4, uimsbf)
mpeg2_bitsdesc (intra_dc_precision, 2, uimsbf)
mpeg2_bitsdesc (picture_structure, 2, uimsbf)
mpeg2_bitsdesc (top_field_first, 1, uimsbf)
mpeg2_bitsdesc (frame_pred_frame_dct, 1, uimsbf)
mpeg2_bitsdesc (concealment_motion_vectors, 1, uimsbf)
mpeg2_bitsdesc (q_scale_type, 1, uimsbf)
mpeg2_bitsdesc (intra_vlc_format, 1, uimsbf)
mpeg2_bitsdesc (alternate_scan, 1, uimsbf)
mpeg2_bitsdesc (repeat_first_field, 1, uimsbf)
mpeg2_bitsdesc (chroma_420_type, 1, uimsbf)
mpeg2_bitsdesc (progressive_frame, 1, uimsbf)
mpeg2_bitsdesc (composite_display_flag, 1, uimsbf)
if ( composite_display_flag ) {
mpeg2_bitsdesc (v_axis, 1, uimsbf)
mpeg2_bitsdesc (field_sequence, 3, uimsbf)
mpeg2_bitsdesc (sub_carrier, 1, uimsbf)
mpeg2_bitsdesc (burst_amplitude, 7, uimsbf)
mpeg2_bitsdesc (sub_carrier_phase, 8, uimsbf)
}
next_start_code()
}
quant_matrix_extension() {
mpeg2_bitsdesc (extension_start_code_identifier, 4, uimsbf)
mpeg2_bitsdesc (load_intra_quantiser_matrix, 1, uimsbf)
if ( load_intra_quantiser_matrix )
mpeg2_bitsdesc (intra_quantiser_matrix[64], 8 * 64, uimsbf)
mpeg2_bitsdesc (load_non_intra_quantiser_matrix, 1, uimsbf)
if ( load_non_intra_quantiser_matrix )
mpeg2_bitsdesc (non_intra_quantiser_matrix[64], 8 * 64, uimsbf)
mpeg2_bitsdesc (load_chroma_intra_quantiser_matrix, 1, uimsbf)
if ( load_chroma_intra_quantiser_matrix )
mpeg2_bitsdesc (chroma_intra_quantiser_matrix[64], 8 * 64, uimsbf)
mpeg2_bitsdesc (load_chroma_non_intra_quantiser_matrix, 1, uimsbf)
if ( load_chroma_non_intra_quantiser_matrix )
mpeg2_bitsdesc (chroma_non_intra_quantiser_matrix[64], 8 * 64, uimsbf)
next_start_code()
}
picture_display_extension() {
mpeg2_bitsdesc (extension_start_code_identifier, 4, uimsbf)
for ( i=0; i<number_of_frame_centre_offsets; i++ ) {
mpeg2_bitsdesc (frame_centre_horizontal_offset, 16, simsbf)
mpeg2_bitsdesc (marker_bit, 1, bslbf)
mpeg2_bitsdesc (frame_centre_vertical_offset, 16, simsbf)
mpeg2_bitsdesc (marker_bit, 1, bslbf)
}
next_start_code()
}
picture_temporal_scalable_extension() {
mpeg2_bitsdesc (extension_start_code_identifier, 4, uimsbf)
mpeg2_bitsdesc (reference_select_code, 2, uimsbf)
mpeg2_bitsdesc (forward_temporal_reference, 10, uimsbf)
mpeg2_bitsdesc (marker_bit, 1, bslbf)
mpeg2_bitsdesc (backward_temporal_reference, 10, uimsbf)
next_start_code()
}
picture_spatial_scalable_extension() {
mpeg2_bitsdesc (extension_start_code_identifier, 4, uimsbf)
mpeg2_bitsdesc (lower_layer_temporal_reference, 10, uimsbf)
mpeg2_bitsdesc (marker_bit, 1, bslbf)
mpeg2_bitsdesc (lower_layer_horizontal_offset, 15, simsbf)
mpeg2_bitsdesc (marker_bit, 1, bslbf)
mpeg2_bitsdesc (lower_layer_vertical_offset, 15, simsbf)
mpeg2_bitsdesc (spatial_temporal_weight_code_table_index, 2, uimsbf)
mpeg2_bitsdesc (lower_layer_progressive_frame, 1, uimsbf)
mpeg2_bitsdesc (lower_layer_deinterlaced_field_select, 1, uimsbf)
next_start_code()
}
copyright_extension() {
mpeg2_bitsdesc (extension_start_code_identifier, 4, uimsbf)
mpeg2_bitsdesc (copyright_flag, 1, bslbf)
mpeg2_bitsdesc (copyright_identifier, 8, uimsbf)
mpeg2_bitsdesc (original_or_copy, 1, bslbf)
mpeg2_bitsdesc (reserved, 7, uimsbf)
mpeg2_bitsdesc (marker_bit, 1, bslbf)
mpeg2_bitsdesc (copyright_number_1, 20, uimsbf)
mpeg2_bitsdesc (marker_bit, 1, bslbf)
mpeg2_bitsdesc (copyright_number_2, 22, uimsbf)
mpeg2_bitsdesc (marker_bit, 1, bslbf)
mpeg2_bitsdesc (copyright_number_3, 22, uimsbf)
next_start_code()
}
picture_data() {
do {
slice()
} while ( nextbits() == slice_start_code )
next_start_code()
}
slice() {
mpeg2_bitsdesc (slice_start_code, 32, bslbf)
if (vertical_size > 2800)
mpeg2_bitsdesc (slice_vertical_position_extension, 3, uimsbf)
if (__stream_defined ("sequence_scalable_extension")) {
if (scalable_mode == “data partitioning” )
mpeg2_bitsdesc (priority_breakpoint, 7, uimsbf)
}
mpeg2_bitsdesc (quantiser_scale_code, 5, uimsbf)
if ( nextbits() == "1" ) {
mpeg2_bitsdesc (intra_slice_flag, 1, bslbf)
mpeg2_bitsdesc (intra_slice, 1, uimsbf)
mpeg2_bitsdesc (reserved_bits, 7, uimsbf)
while ( nextbits() == "1" ) {
mpeg2_bitsdesc (extra_bit_slice, 1, uimsbf)
mpeg2_bitsdesc (extra_information_slice, 8, uimsbf)
}
}
mpeg2_bitsdesc (extra_bit_slice, 1, uimsbf)
do {
next_start_code()
} while ( nextbits() != "000 0000 0000 0000 0000 0000" )
next_start_code()
}
macroblock() {
while ( nextbits() == "0000 0001 000" )
mpeg2_bitsdesc (macroblock_escape, 11, bslbf)
mpeg2_bitsdesc (macroblock_address_increment, 1-11, vlclbf)
macroblock_modes()
if ( macroblock_quant )
mpeg2_bitsdesc (quantiser_scale_code, 5, uimsbf)
if ( macroblock_motion_forward ||
( macroblock_intra && concealment_motion_vectors) )
motion_vectors( 0 )
if ( macroblock_motion_backward )
motion_vectors( 1 )
if ( macroblock_intra && concealment_motion_vectors)
mpeg2_bitsdesc (marker_bit, 1, bslbf)
if ( macroblock_pattern )
coded_block_pattern()
for ( i=0; i<block_count; i++ ) {
block( i )
}
}
macroblock_modes() {
mpeg2_bitsdesc (macroblock_type, 1-9, vlclbf)
if ( ( spatial_temporal_weight_code_flag == 1 ) &&
( spatial_temporal_weight_code_table_index != "00") ) {
mpeg2_bitsdesc (spatial_temporal_weight_code, 2, uimsbf)
}
if ( macroblock_motion_forward ||
macroblock_motion_backward ) {
if ( picture_structure == "frame" ) {
if ( frame_pred_frame_dct == 0 )
mpeg2_bitsdesc (frame_motion_type, 2, uimsbf)
} else {
mpeg2_bitsdesc (field_motion_type, 2, uimsbf)
}
}
if ( ( picture_structure == “Frame picture” ) &&
( frame_pred_frame_dct == 0 ) &&
( macroblock_intra || macoblock_pattern) ){
mpeg2_bitsdesc (dct_type, 1, uimsbf)
}
}
motion_vectors ( s ) {
if ( motion_vector_count == 1 ) {
if (( mv_format == field ) && ( dmv != 1))
mpeg2_bitsdesc (motion_vertical_field_select[0][s], 1, uimsbf)
motion_vector( 0, s )
} else {
mpeg2_bitsdesc (motion_vertical_field_select[0][s], 1, uimsbf)
motion_vector( 0, s )
mpeg2_bitsdesc (motion_vertical_field_select[1][s], 1, uimsbf)
motion_vector(1, s )
}
}
motion_vector ( r, s ) {
mpeg2_bitsdesc (motion_code[r][s][0], 1-11, vlclbf)
if ( ( f_code[s][0] != 1) && ( motion_code[r][s][0] != 0 ) )
mpeg2_bitsdesc (motion_residual[r][s][0], 1-8, uimsbf)
if (dmv == 1)
mpeg2_bitsdesc (dmvector[0], 1-2, vlclbf)
mpeg2_bitsdesc (motion_code[r][s][1], 1-11, vlclbf)
if ( ( f_code[s][1] != 1) && ( motion_code[r][s][1] != 0 ) )
mpeg2_bitsdesc (motion_residual[r][s][1], 1-8, uimsbf)
if (dmv == 1)
mpeg2_bitsdesc (dmvector[1], 1-2, vlclbf)
}
coded_block_pattern () {
mpeg2_bitsdesc (coded_block_pattern_420, 3-9, vlclbf)
if ( chroma_format == 4:2:2 )
mpeg2_bitsdesc (coded_block_pattern_1, 2, uimsbf)
if ( chroma_format == 4:4:4 )
mpeg2_bitsdesc (coded_block_pattern_2, 6, uimsbf)
}
block( i ) {
if ( pattern_code[i] ) {
if ( macroblock_intra ) {
if ( i<4 ) {
mpeg2_bitsdesc (dct_dc_size_luminance, 2-9, vlclbf)
if(dct_dc_size_luminance != 0)
mpeg2_bitsdesc (dct_dc_differential, 1-11, uimsbf)
} else {
mpeg2_bitsdesc (dct_dc_size_chrominance, 2-10, vlclbf)
if(dct_dc_size_chrominance !=0)
mpeg2_bitsdesc (dct_dc_differential, 1-11, uimsbf)
}
} else {
mpeg2_bitsdesc (first_dct_coefficient, 2-24, uimsbf)
}
while ( nextbits() != end_of_block )
mpeg2_bitsdesc (subsequent_dct_coefficient, 3-24, uimsbf)
mpeg2_bitsdesc (end_of_block, 2 or 4, vlclbf)
}
}