Last active
June 14, 2023 08:46
-
-
Save figgis/fd509a02d4b1aa89f6ef to your computer and use it in GitHub Desktop.
H.265/HEVC bitstream parser
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| #!/usr/bin/env python | |
| """ | |
| - ae(v): context-adaptive arithmetic entropy-coded syntax element. The parsing process for this descriptor is | |
| specified in clause 9.3. | |
| - b(8): byte having any pattern of bit string (8 bits). The parsing process | |
| for this descriptor is specified by the return value of the function | |
| read_bits( 8 ). | |
| - f(n): fixed-pattern bit string using n bits written (from left to right) | |
| with the left bit first. The parsing process for this descriptor is specified | |
| by the return value of the function read_bits( n ). | |
| - se(v): signed integer 0-th order Exp-Golomb-coded syntax element with the left bit first. The parsing process | |
| for this descriptor is specified in clause 9.2. | |
| - u(n): unsigned integer using n bits. When n is "v" in the syntax table, the number of bits varies in a manner | |
| dependent on the value of other syntax elements. The parsing process for this descriptor is specified by the | |
| return value of the function read_bits( n ) interpreted as a binary representation of an unsigned integer with | |
| most significant bit written first. | |
| - ue(v): unsigned integer 0-th order Exp-Golomb-coded syntax element with the left bit first. The parsing | |
| process for this descriptor is specified in clause 9.2. | |
| """ | |
| import sys | |
| import os | |
| import re | |
| from bitstring import BitArray, BitStream | |
| class NalUnitType: | |
| """ | |
| Table 7-1 - NAL unit type codes and NAL unit type classes | |
| copypaste from source/Lib/TLibCommon/CommonDef.h | |
| """ | |
| NAL_UNIT_CODED_SLICE_TRAIL_N = 0 | |
| NAL_UNIT_CODED_SLICE_TRAIL_R = 1 | |
| NAL_UNIT_CODED_SLICE_TSA_N = 2 | |
| NAL_UNIT_CODED_SLICE_TSA_R = 3 | |
| NAL_UNIT_CODED_SLICE_STSA_N = 4 | |
| NAL_UNIT_CODED_SLICE_STSA_R = 5 | |
| NAL_UNIT_CODED_SLICE_RADL_N = 6 | |
| NAL_UNIT_CODED_SLICE_RADL_R = 7 | |
| NAL_UNIT_CODED_SLICE_RASL_N = 8 | |
| NAL_UNIT_CODED_SLICE_RASL_R = 9 | |
| NAL_UNIT_RESERVED_VCL_N10 = 10 | |
| NAL_UNIT_RESERVED_VCL_R11 = 11 | |
| NAL_UNIT_RESERVED_VCL_N12 = 12 | |
| NAL_UNIT_RESERVED_VCL_R13 = 13 | |
| NAL_UNIT_RESERVED_VCL_N14 = 14 | |
| NAL_UNIT_RESERVED_VCL_R15 = 15 | |
| NAL_UNIT_CODED_SLICE_BLA_W_LP = 16 | |
| NAL_UNIT_CODED_SLICE_BLA_W_RADL = 17 | |
| NAL_UNIT_CODED_SLICE_BLA_N_LP = 18 | |
| NAL_UNIT_CODED_SLICE_IDR_W_RADL = 19 | |
| NAL_UNIT_CODED_SLICE_IDR_N_LP = 20 | |
| NAL_UNIT_CODED_SLICE_CRA = 21 | |
| NAL_UNIT_RESERVED_IRAP_VCL22 = 22 | |
| NAL_UNIT_RESERVED_IRAP_VCL23 = 23 | |
| NAL_UNIT_RESERVED_VCL24 = 24 | |
| NAL_UNIT_RESERVED_VCL25 = 25 | |
| NAL_UNIT_RESERVED_VCL26 = 26 | |
| NAL_UNIT_RESERVED_VCL27 = 27 | |
| NAL_UNIT_RESERVED_VCL28 = 28 | |
| NAL_UNIT_RESERVED_VCL29 = 29 | |
| NAL_UNIT_RESERVED_VCL30 = 30 | |
| NAL_UNIT_RESERVED_VCL31 = 31 | |
| NAL_UNIT_VPS = 32 | |
| NAL_UNIT_SPS = 33 | |
| NAL_UNIT_PPS = 34 | |
| NAL_UNIT_ACCESS_UNIT_DELIMITER = 35 | |
| NAL_UNIT_EOS = 36 | |
| NAL_UNIT_EOB = 37 | |
| NAL_UNIT_FILLER_DATA = 38 | |
| NAL_UNIT_PREFIX_SEI = 39 | |
| NAL_UNIT_SUFFIX_SEI = 40 | |
| NAL_UNIT_RESERVED_NVCL41 = 41 | |
| NAL_UNIT_RESERVED_NVCL42 = 42 | |
| NAL_UNIT_RESERVED_NVCL43 = 43 | |
| NAL_UNIT_RESERVED_NVCL44 = 44 | |
| NAL_UNIT_RESERVED_NVCL45 = 45 | |
| NAL_UNIT_RESERVED_NVCL46 = 46 | |
| NAL_UNIT_RESERVED_NVCL47 = 47 | |
| NAL_UNIT_UNSPECIFIED_48 = 48 | |
| NAL_UNIT_UNSPECIFIED_49 = 49 | |
| NAL_UNIT_UNSPECIFIED_50 = 50 | |
| NAL_UNIT_UNSPECIFIED_51 = 51 | |
| NAL_UNIT_UNSPECIFIED_52 = 52 | |
| NAL_UNIT_UNSPECIFIED_53 = 53 | |
| NAL_UNIT_UNSPECIFIED_54 = 54 | |
| NAL_UNIT_UNSPECIFIED_55 = 55 | |
| NAL_UNIT_UNSPECIFIED_56 = 56 | |
| NAL_UNIT_UNSPECIFIED_57 = 57 | |
| NAL_UNIT_UNSPECIFIED_58 = 58 | |
| NAL_UNIT_UNSPECIFIED_59 = 59 | |
| NAL_UNIT_UNSPECIFIED_60 = 60 | |
| NAL_UNIT_UNSPECIFIED_61 = 61 | |
| NAL_UNIT_UNSPECIFIED_62 = 62 | |
| NAL_UNIT_UNSPECIFIED_63 = 63 | |
| NAL_UNIT_INVALID = 64 | |
| class slice_segment_header(object): | |
| def __init__(self, s): | |
| """ | |
| 7.3.6.1 General slice segment header syntax | |
| """ | |
| pass | |
| def show(self): | |
| pass | |
| class slice_segment_data(object): | |
| def __init__(self, s): | |
| """ | |
| """ | |
| pass | |
| def show(self): | |
| pass | |
| class rbsp_slice_segment_trailing_bits(object): | |
| def __init__(self, s): | |
| """ | |
| """ | |
| pass | |
| def show(self): | |
| pass | |
| class hrd_parameters(object): | |
| def __init__(self, s, commonInfPresentFlag, maxNumSubLayersMinus1): | |
| """ | |
| E.2.2 HRD parameters syntax | |
| """ | |
| self.t='\t\t' | |
| if commonInfPresentFlag: | |
| self.nal_hrd_parameters_present_flag = s.read('uint:1') | |
| self.vcl_hrd_parameters_present_flag = s.read('uint:1') | |
| if self.nal_hrd_parameters_present_flag or self.vcl_hrd_parameters_present_flag: | |
| self.sub_pic_hrd_params_present_flag = s.read('uint:1') | |
| if self.sub_pic_hrd_params_present_flag: | |
| self.tick_divisor_minus2 = s.read('uint:8') | |
| self.du_cpb_removal_delay_increment_length_minus1 = s.read('uint:5') | |
| self.sub_pic_cpb_params_in_pic_timing_sei_flag = s.read('uint:1') | |
| self.dpb_output_delay_du_length_minus1 = s.read('uint:5') | |
| self.bit_rate_scale = s.read('uint:4') | |
| self.cpb_size_scale = s.read('uint:4') | |
| if self.sub_pic_hrd_params_present_flag: | |
| self.icpb_size_du_scale = s.read('uint:4') | |
| self.initial_cpb_removal_delay_length_minus1 = s.read('uint:5') | |
| self.au_cpb_removal_delay_length_minus1 = s.read('uint:5') | |
| self.dpb_output_delay_length_minus1 = s.read('uint:5') | |
| for i in range(maxNumSubLayersMinus1 + 1): | |
| self.fixed_pic_rate_general_flag[ i ] = s.read('uint:1') | |
| if not self.fixed_pic_rate_general_flag[i]: | |
| self.fixed_pic_rate_within_cvs_flag[i] = s.read('uint:1') | |
| if self.fixed_pic_rate_within_cvs_flag[i]: | |
| self.elemental_duration_in_tc_minus1[i] = s.read('ue') | |
| else: | |
| self.low_delay_hrd_flag[i] = s.read('uint:1') | |
| if not self.low_delay_hrd_flag[i]: | |
| self.cpb_cnt_minus1[i] = s.read('ue') | |
| if self.nal_hrd_parameters_present_flag: | |
| sub_layer_hrd_parameters(s, i) | |
| if self.vcl_hrd_parameters_present_flag: | |
| self.sub_layer_hrd_parameters(s,i) | |
| def show(self): | |
| """ | |
| """ | |
| attrs = vars(self) | |
| print self.t,'hrd parameters' | |
| print self.t,'==============' | |
| for k, v in attrs.iteritems(): | |
| print k, v | |
| class slice_segment_layer_rbsp(object): | |
| def __init__(self, s): | |
| """ | |
| Interpret next bits in BitString s as an ... | |
| 7.3.2.9 Slice segment layer RBSP syntax | |
| """ | |
| self.t = '\t' | |
| slice_segment_header(s).show() | |
| slice_segment_data(s).show() | |
| rbsp_slice_segment_trailing_bits(s) | |
| def show(self): | |
| pass | |
| class video_parameter_set_rbsp(object): | |
| def __init__(self, s): | |
| """ | |
| Interpret next bits in BitString s as an VPS | |
| 7.3.2.1 Video parameter set RBSP syntax | |
| """ | |
| self.t = '\t' | |
| self.vps_video_parameter_set_id = s.read('uint:4') | |
| self.vps_reserved_three_2bits = s.read('uint:2') | |
| self.vps_max_layers_minus1 = s.read('uint:6') | |
| self.vps_max_sub_layers_minus1 = s.read('uint:3') | |
| self.vps_temporal_id_nesting_flag = s.read('uint:1') | |
| self.vps_reserved_0xffff_16bits = s.read('uint:16') | |
| self.ptl = profile_tier_level(s, self.vps_max_sub_layers_minus1) | |
| self.vps_sub_layer_ordering_info_present_flag = s.read('uint:1') | |
| i = 0 if self.vps_sub_layer_ordering_info_present_flag else self.vps_max_sub_layers_minus1 | |
| self.vps_max_dec_pic_buffering_minus1 = [] | |
| self.vps_max_num_reorder_pics = [] | |
| self.vps_max_latency_increase_plus1 = [] | |
| for n in range(self.vps_max_sub_layers_minus1 + 1): | |
| self.vps_max_dec_pic_buffering_minus1.append(s.read('ue')) | |
| self.vps_max_num_reorder_pics.append(s.read('ue')) | |
| self.vps_max_latency_increase_plus1.append(s.read('ue')) | |
| self.vps_max_layer_id = s.read('uint:1') | |
| self.vps_num_layer_sets_minus1 = s.read('uint:1') | |
| for i in range(self.vps_num_layer_sets_minus1 + 1): | |
| for j in range(self.vps_max_layer_id + 1): | |
| #layer_id_included_flag[ i ][ j ] | |
| s.read('uint:1') | |
| self.vps_timing_info_present_flag = s.read('uint:1') | |
| if self.vps_timing_info_present_flag: | |
| self.vps_num_units_in_tick = s.read('uint:1') | |
| self.vps_time_scale = s.read('uint:1') | |
| self.vps_poc_proportional_to_timing_flag = s.read('uint:1') | |
| if self.vps_poc_proportional_to_timing_flag: | |
| self.vps_num_ticks_poc_diff_one_minus1 = s.read('uint:1') | |
| self.vps_num_hrd_parameters = s.read('uint:1') | |
| self.hrd_layer_set_idx = [] | |
| self.cprms_present_flag = [] | |
| for i in range(self.vps_num_hrd_parameters): | |
| self.hrd_layer_set_idx.append(s.read('ue')) | |
| if i > 0: | |
| cprms_present_flag.append(s.read('uint:1')) | |
| self.hrdp = hrd_parameters(cprms_present_flag[i], self.vps_max_sub_layers_minus1) | |
| self.vps_extension_flag = s.read('uint:1') | |
| # if self.vps_extension_flag: | |
| # while( more_rbsp_data( ) ) | |
| # vps_extension_data_flag | |
| # rbsp_trailing_bits( ) | |
| def show(self): | |
| print self.t,'Video parameter Set RBSP' | |
| print self.t,'========================' | |
| print self.t,'vps_video_parameter_set_id', self.vps_video_parameter_set_id | |
| print self.t,'vps_reserved_three_2bits', self.vps_reserved_three_2bits | |
| print self.t,'vps_max_layers_minus1', self.vps_max_layers_minus1 | |
| print self.t,'vps_max_sub_layers_minus1', self.vps_max_sub_layers_minus1 | |
| print self.t,'vps_temporal_id_nesting_flag', self.vps_temporal_id_nesting_flag | |
| print self.t,'vps_reserved_0xffff_16bits', self.vps_reserved_0xffff_16bits | |
| self.ptl.show() | |
| print self.t, 'vps_sub_layer_ordering_info_present_flag', self.vps_sub_layer_ordering_info_present_flag | |
| for n in range(self.vps_max_sub_layers_minus1 + 1): | |
| print self.t, 'vps_max_dec_pic_buffering_minus1', self.vps_max_dec_pic_buffering_minus1 | |
| print self.t, 'vps_max_num_reorder_pics', self.vps_max_num_reorder_pics | |
| print self.t, 'vps_max_latency_increase_plus1', self.vps_max_latency_increase_plus1 | |
| print self.t, 'vps_max_layer_id', self.vps_max_layer_id | |
| print self.t, 'vps_num_layer_sets_minus1', self.vps_num_layer_sets_minus1 | |
| for i in range(self.vps_num_layer_sets_minus1 + 1): | |
| for j in range(self.vps_max_layer_id + 1): | |
| #layer_id_included_flag[ i ][ j ] | |
| pass | |
| print self.t, 'vps_timing_info_present_flag', self.vps_timing_info_present_flag | |
| if self.vps_timing_info_present_flag: | |
| print self.t, 'vps_num_units_in_tick', self.vps_num_units_in_tick | |
| print self.t, 'vps_time_scale', self.vps_time_scale | |
| print self.t, 'vps_poc_proportional_to_timing_flag', self.vps_poc_proportional_to_timing_flag | |
| if self.vps_poc_proportional_to_timing_flag: | |
| print self.t, 'vps_num_ticks_poc_diff_one_minus1', self.vps_num_ticks_poc_diff_one_minus1 | |
| print self.t, 'vps_num_hrd_parameters', self.vps_num_hrd_parameters | |
| for i in range(self.vps_num_hrd_parameters): | |
| self.hrd_layer_set_idx.append(s.read('ue')) | |
| if i > 0: | |
| cprms_present_flag.append(s.read('uint:1')) | |
| self.hrdp.show() | |
| print self.t, 'vps_extension_flag', self.vps_extension_flag | |
| class profile_tier_level(object): | |
| def __init__(self, s, maxNumSubLayersMinus1): | |
| """ | |
| Interpret next bits in BitString s as an profile_tier_level | |
| 7.3.3 Profile, tier and level syntax | |
| """ | |
| self.t = '\t\t' | |
| self.general_profile_space = s.read('uint:2') | |
| self.general_tier_flag = s.read('uint:1') | |
| self.general_profile_idc = s.read('uint:5') | |
| self.general_profile_compatibility_flag = [s.read('uint:1') for _ in range(32)] | |
| self.general_progressive_source_flag = s.read('uint:1') | |
| self.general_interlaced_source_flag = s.read('uint:1') | |
| self.general_non_packed_constraint_flag = s.read('uint:1') | |
| self.general_frame_only_constraint_flag = s.read('uint:1') | |
| self.general_reserved_zero_44bits = s.read('uint:44') | |
| self.general_level_idc = s.read('uint:8') | |
| self.sub_layer_profile_present_flag = [] | |
| self.sub_layer_level_present_flag = [] | |
| for i in range(maxNumSubLayersMinus1): | |
| self.sub_layer_profile_present_flag.append(s.read('uint:1')) | |
| self.sub_layer_level_present_flag.append(s.read('uint:1')) | |
| def show(self): | |
| print self.t,'Profile Tier Level' | |
| print self.t,'==================' | |
| print self.t,'general_profile_space', self.general_profile_space | |
| print self.t,'general_tier_flag', self.general_tier_flag | |
| print self.t,'general_profile_idc', self.general_profile_idc | |
| for i in range(32): | |
| print "{}{}[{:2d}] {}".format(self.t, 'general_profile_compatibility_flag', i, self.general_profile_compatibility_flag[i]) | |
| print self.t,'general_progressive_source_flag', self.general_progressive_source_flag | |
| print self.t,'general_interlaced_source_flag', self.general_interlaced_source_flag | |
| print self.t,'general_non_packed_constraint_flag', self.general_non_packed_constraint_flag | |
| print self.t,'general_frame_only_constraint_flag', self.general_frame_only_constraint_flag | |
| print self.t,'general_reserved_zero_44bits', self.general_reserved_zero_44bits | |
| # print self.t,"{0:b}".format(self.general_reserved_zero_44bits) | |
| print self.t,'general_level_idc', self.general_level_idc | |
| print self.t,'sub_layer_profile_present_flag', self.sub_layer_profile_present_flag | |
| print self.t,'sub_layer_level_present_flag', self.sub_layer_level_present_flag | |
| class seq_parameter_set_rbsp(object): | |
| def __init__(self, s): | |
| """ | |
| Interpret next bits in BitString s as an SPS | |
| 7.3.2.2 Sequence parameter set RBSP syntax | |
| """ | |
| self.t = '\t' | |
| self.sps_video_parameter_set_id = s.read('uint:4') | |
| self.sps_max_sub_layers_minus1 = s.read('uint:1') | |
| self.sps_temporal_id_nesting_flag = s.read('uint:1') | |
| self.ptl = profile_tier_level(s, self.sps_max_sub_layers_minus1) | |
| def show(self): | |
| print self.t,'Sequence Parameter Set RBSP' | |
| print self.t,'===========================' | |
| print self.t,'sps_video_parameter_set_id', self.sps_video_parameter_set_id | |
| print self.t,'sps_max_sub_layers_minus1', self.sps_max_sub_layers_minus1 | |
| print self.t,'sps_temporal_id_nesting_flag', self.sps_temporal_id_nesting_flag | |
| self.ptl.show() | |
| class pic_parameter_set_rbsp(object): | |
| def __init__(self, s): | |
| """ | |
| Interpret next bits in BitString s as an PPS | |
| 7.3.2.3 Picture parameter set RBSP syntax | |
| """ | |
| self.t='\t' | |
| self.pps_pic_parameter_set_id = s.read('ue') | |
| self.pps_seq_parameter_set_id = s.read('ue') | |
| self.dependent_slice_segments_enabled_flag = s.read('uint:1') | |
| self.output_flag_present_flag = s.read('uint:1') | |
| self.num_extra_slice_header_bits = s.read('uint:3') | |
| self.sign_data_hiding_enabled_flag = s.read('uint:1') | |
| self.cabac_init_present_flag = s.read('uint:1') | |
| self.num_ref_idx_l0_default_active_minus1 = s.read('ue') | |
| self.num_ref_idx_l1_default_active_minus1 = s.read('ue') | |
| self.init_qp_minus26 = s.read('se') | |
| self.constrained_intra_pred_flag = s.read('uint:1') | |
| self.transform_skip_enabled_flag = s.read('uint:1') | |
| self.cu_qp_delta_enabled_flag = s.read('uint:1') | |
| if self.cu_qp_delta_enabled_flag: | |
| self.diff_cu_qp_delta_depth = s.read('ue') | |
| self.pps_cb_qp_offset = s.read('se') | |
| self.pps_cr_qp_offset = s.read('se') | |
| self.pps_slice_chroma_qp_offsets_present_flag = s.read('uint:1') | |
| self.weighted_pred_flag = s.read('uint:1') | |
| self.weighted_bipred_flag = s.read('uint:1') | |
| self.transquant_bypass_enabled_flag = s.read('uint:1') | |
| self.tiles_enabled_flag = s.read('uint:1') | |
| self.entropy_coding_sync_enabled_flag = s.read('uint:1') | |
| if self.tiles_enabled_flag: | |
| self.num_tile_columns_minus1 = s.read('ue') | |
| self.num_tile_rows_minus1 = s.read('ue') | |
| self.uniform_spacing_flag = s.read('uint:1') | |
| if not self.uniform_spacing_flag: | |
| self.column_width_minus1 = [s.read('ue') for _ in range(self.num_tile_columns_minus1)] | |
| self.row_height_minus1 = [s.read('ue') for _ in range(self.num_tile_rows_minus1)] | |
| self.loop_filter_across_tiles_enabled_flagi = s.read('uint:1') | |
| self.pps_loop_filter_across_slices_enabled_flag = s.read('uint:1') | |
| self.deblocking_filter_control_present_flag = s.read('uint:1') | |
| if self.deblocking_filter_control_present_flag: | |
| self.deblocking_filter_override_enabled_flag = s.read('uint:1') | |
| self.pps_deblocking_filter_disabled_flag = s.read('uint:1') | |
| if not self.pps_deblocking_filter_disabled_flag: | |
| self.pps_beta_offset_div2 = s.read('se') | |
| self.pps_tc_offset_div2 = s.read('se') | |
| self.pps_scaling_list_data_present_flag = s.read('uint:1') | |
| if self.pps_scaling_list_data_present_flag: | |
| scaling_list_data(s) | |
| self.lists_modification_present_flag = s.read('uint:1') | |
| self.log2_parallel_merge_level_minus2 = s.read('ue') | |
| self.slice_segment_header_extension_present_flag = s.read('uint:1') | |
| self.pps_extension_flag = s.read('uint:1') | |
| # if self.pps_extension_flag: | |
| # while more_rbsp_data(): | |
| # self.pps_extension_data_flag = s.read('uint:1') | |
| # rbsp_trailing_bits() | |
| def show(self): | |
| print self.t,'Picture Parameter Set RBSP' | |
| print self.t,'==========================' | |
| print self.t,'pps_pic_parameter_set_id', self.pps_pic_parameter_set_id | |
| print self.t,'pps_seq_parameter_set_id', self.pps_seq_parameter_set_id | |
| print self.t,'dependent_slice_segments_enabled_flag', self.dependent_slice_segments_enabled_flag | |
| print self.t,'output_flag_present_flag', self.output_flag_present_flag | |
| print self.t,'num_extra_slice_header_bits', self.num_extra_slice_header_bits | |
| print self.t,'sign_data_hiding_enabled_flag', self.sign_data_hiding_enabled_flag | |
| print self.t,'cabac_init_present_flag', self.cabac_init_present_flag | |
| print self.t,'num_ref_idx_l0_default_active_minus1', self.num_ref_idx_l0_default_active_minus1 | |
| print self.t,'num_ref_idx_l1_default_active_minus1', self.num_ref_idx_l1_default_active_minus1 | |
| print self.t,'init_qp_minus26', self.init_qp_minus26 | |
| print self.t,'constrained_intra_pred_flag', self.constrained_intra_pred_flag | |
| print self.t,'transform_skip_enabled_flag', self.transform_skip_enabled_flag | |
| print self.t,'cu_qp_delta_enabled_flag', self.cu_qp_delta_enabled_flag | |
| if self.cu_qp_delta_enabled_flag: | |
| print self.t,'diff_cu_qp_delta_depth', self.diff_cu_qp_delta_depth | |
| print self.t,'pps_cb_qp_offset', self.pps_cb_qp_offset | |
| print self.t,'pps_cr_qp_offset', self.pps_cr_qp_offset | |
| print self.t,'pps_slice_chroma_qp_offsets_present_flag', self.pps_slice_chroma_qp_offsets_present_flag | |
| print self.t,'weighted_pred_flag', self.weighted_pred_flag | |
| print self.t,'weighted_bipred_flag', self.weighted_bipred_flag | |
| print self.t,'transquant_bypass_enabled_flag', self.transquant_bypass_enabled_flag | |
| print self.t,'tiles_enabled_flag', self.tiles_enabled_flag | |
| print self.t,'entropy_coding_sync_enabled_flag', self.entropy_coding_sync_enabled_flag | |
| if self.tiles_enabled_flag: | |
| print self.t, 'num_tile_columns_minus1', self.num_tile_columns_minus1 | |
| print self.t, 'num_tile_rows_minus1', self.num_tile_rows_minus1 | |
| print self.t, 'uniform_spacing_flag', self.uniform_spacing_flag | |
| if not self.uniform_spacing_flag: | |
| print self.t, 'column_width_minus1', self.column_width_minus1 | |
| print self.t, 'row_height_minus1', self.row_height_minus1 | |
| print self.t, 'loop_filter_across_tiles_enabled_flagi', self.loop_filter_across_tiles_enabled_flagi | |
| print self.t, 'pps_loop_filter_across_slices_enabled_flag', self.pps_loop_filter_across_slices_enabled_flag | |
| print self.t, 'deblocking_filter_control_present_flag', self.deblocking_filter_control_present_flag | |
| if self.deblocking_filter_control_present_flag: | |
| print self.t, 'deblocking_filter_override_enabled_flag', self.deblocking_filter_override_enabled_flag | |
| print self.t, 'pps_deblocking_filter_disabled_flag', self.pps_deblocking_filter_disabled_flag | |
| if not self.pps_deblocking_filter_disabled_flag: | |
| print self.t, 'pps_beta_offset_div2', self.pps_beta_offset_div2 | |
| print self.t, 'pps_tc_offset_div2', self.pps_tc_offset_div2 | |
| print self.t, 'pps_scaling_list_data_present_flag', self.pps_scaling_list_data_present_flag | |
| if self.pps_scaling_list_data_present_flag: | |
| scaling_list_data(s) | |
| print self.t, 'lists_modification_present_flag', self.lists_modification_present_flag | |
| print self.t, 'log2_parallel_merge_level_minus2', self.log2_parallel_merge_level_minus2 | |
| print self.t, 'slice_segment_header_extension_present_flag', self.slice_segment_header_extension_present_flag | |
| print self.t, 'pps_extension_flag', self.pps_extension_flag | |
| class nal_unit_header(object): | |
| def __init__(self, s): | |
| """ | |
| Interpret next bits in BitString s as a nal_unit | |
| """ | |
| self.forbidden_zero_bit = s.read('uint:1') | |
| self.nal_unit_type = s.read('uint:6') | |
| self.nuh_layer_id = s.read('uint:6') | |
| self.nuh_temporal_id_plus1 = s.read('uint:3') | |
| def show(self): | |
| print 'forbidden_zero_bit', self.forbidden_zero_bit | |
| print 'nal_unit_type', self.nal_unit_type | |
| print 'nuh_layer_id', self.nuh_layer_id | |
| print 'nuh_temporal_id_plus1', self.nuh_temporal_id_plus1 | |
| def read_nal_unit(s, i, NumBytesInNalUnit): | |
| """ | |
| Table 7-1 - NAL unit type codes and NAL unit type classes | |
| """ | |
| # Advance pointer and skip 24 bits, i.e. 0x000001 | |
| s.pos = i + 24 | |
| n = nal_unit_header(s) | |
| n.show() | |
| # 7.3.1.1 | |
| # Convert NAL data (Annex B format) to RBSP data | |
| NumBytesInRbsp = 0 | |
| rbsp_byte = BitStream() | |
| for i in xrange(NumBytesInNalUnit): | |
| if (i+2) < NumBytesInNalUnit and s.peek('bits:24') == '0x000003': | |
| rbsp_byte.append(s.read('bits:8')) | |
| rbsp_byte.append(s.read('bits:8')) | |
| # emulation_prevention_three_byte | |
| s.read('bits:8') | |
| else: | |
| rbsp_byte.append(s.read('bits:8')) | |
| NumBytesInRbsp = len(rbsp_byte) | |
| s = rbsp_byte | |
| nal_unit_type = n.nal_unit_type | |
| if nal_unit_type == NalUnitType.NAL_UNIT_CODED_SLICE_TRAIL_N or \ | |
| nal_unit_type == NalUnitType.NAL_UNIT_CODED_SLICE_TRAIL_R: | |
| # Coded slice segment of a non-TSA, non-STSA trailing picture | |
| slice_segment_layer_rbsp(s).show() | |
| elif nal_unit_type == NalUnitType.NAL_UNIT_CODED_SLICE_TSA_N or \ | |
| nal_unit_type == NalUnitType.NAL_UNIT_CODED_SLICE_TSA_R: | |
| # Coded slice segment of a TSA picture | |
| slice_segment_layer_rbsp(s) | |
| elif nal_unit_type == NalUnitType.NAL_UNIT_CODED_SLICE_STSA_N or \ | |
| nal_unit_type == NalUnitType.NAL_UNIT_CODED_SLICE_STSA_R: | |
| # Coded slice segment of an STSA picture | |
| slice_segment_layer_rbsp(s).show() | |
| elif nal_unit_type == NalUnitType.NAL_UNIT_CODED_SLICE_RADL_N or \ | |
| nal_unit_type == NalUnitType.NAL_UNIT_CODED_SLICE_RADL_R: | |
| # Coded slice segment of a RADL picture | |
| slice_segment_layer_rbsp(s).show() | |
| elif nal_unit_type == NalUnitType.NAL_UNIT_CODED_SLICE_RASL_N or \ | |
| nal_unit_type == NalUnitType.NAL_UNIT_CODED_SLICE_RASL_R: | |
| # Coded slice segment of a RADL picture | |
| slice_segment_layer_rbsp(s).show() | |
| elif nal_unit_type == NalUnitType.NAL_UNIT_RESERVED_VCL_N10 or \ | |
| nal_unit_type == NalUnitType.NAL_UNIT_RESERVED_VCL_N12 or \ | |
| nal_unit_type == NalUnitType.NAL_UNIT_RESERVED_VCL_N14: | |
| # Reserved non-IRAP sub-layer non-reference VCL NAL unit types | |
| pass | |
| elif nal_unit_type == NalUnitType.NAL_UNIT_RESERVED_VCL_R11 or \ | |
| nal_unit_type == NalUnitType.NAL_UNIT_RESERVED_VCL_R13 or \ | |
| nal_unit_type == NalUnitType.NAL_UNIT_RESERVED_VCL_R15: | |
| # Reserved non-IRAP sub-layer reference VCL NAL unit types | |
| pass | |
| elif nal_unit_type == NalUnitType.NAL_UNIT_CODED_SLICE_BLA_W_LP or \ | |
| nal_unit_type == NalUnitType.NAL_UNIT_CODED_SLICE_BLA_W_RADL or \ | |
| nal_unit_type == NalUnitType.NAL_UNIT_CODED_SLICE_BLA_N_LP: | |
| # Coded slice segment of a BLA picture | |
| slice_segment_layer_rbsp(s).show() | |
| elif nal_unit_type == NalUnitType.NAL_UNIT_CODED_SLICE_IDR_W_RADL or \ | |
| nal_unit_type == NalUnitType.NAL_UNIT_CODED_SLICE_IDR_N_LP: | |
| # Coded slice segment of an IDR picture | |
| slice_segment_layer_rbsp(s).show() | |
| elif nal_unit_type == NalUnitType.NAL_UNIT_CODED_SLICE_CRA: | |
| # Coded slice segment of a CRA picture | |
| slice_segment_layer_rbsp(s).show() | |
| elif nal_unit_type == NalUnitType.NAL_UNIT_RESERVED_IRAP_VCL22 or \ | |
| nal_unit_type == NalUnitType.NAL_UNIT_RESERVED_IRAP_VCL23: | |
| # Reserved IRAP VCL NAL unit types | |
| pass | |
| elif nal_unit_type == NalUnitType.NAL_UNIT_RESERVED_VCL24 or \ | |
| nal_unit_type == NalUnitType.NAL_UNIT_RESERVED_VCL25 or \ | |
| nal_unit_type == NalUnitType.NAL_UNIT_RESERVED_VCL26 or \ | |
| nal_unit_type == NalUnitType.NAL_UNIT_RESERVED_VCL27 or \ | |
| nal_unit_type == NalUnitType.NAL_UNIT_RESERVED_VCL28 or \ | |
| nal_unit_type == NalUnitType.NAL_UNIT_RESERVED_VCL29 or \ | |
| nal_unit_type == NalUnitType.NAL_UNIT_RESERVED_VCL30 or \ | |
| nal_unit_type == NalUnitType.NAL_UNIT_RESERVED_VCL31: | |
| #Reserved non-IRAP VCL NAL unit types | |
| pass | |
| elif nal_unit_type == NalUnitType.NAL_UNIT_VPS: | |
| # Video parameter set | |
| video_parameter_set_rbsp(s).show() | |
| elif nal_unit_type == NalUnitType.NAL_UNIT_SPS: | |
| # Sequence parameter set | |
| seq_parameter_set_rbsp(s).show() | |
| elif nal_unit_type == NalUnitType.NAL_UNIT_PPS: | |
| # Picture parameter set | |
| pic_parameter_set_rbsp(s).show() | |
| def main(): | |
| """ | |
| """ | |
| F = 'bqmall.bin' | |
| s = BitStream(filename=F) | |
| nals = list(s.findall('0x000001', bytealigned=True)) | |
| size = [y - x for x,y in zip(nals,nals[1:])] | |
| for i, n in zip(nals, size): | |
| print "!! Found NAL @ offset {0:d} ({0:#x})".format((i+24)/8) | |
| read_nal_unit(s, i, n/8) # bits to bytes | |
| if __name__ == "__main__": | |
| main() |
Thank you for sharing the code!
I think there is a wrong parsing process at line 341:
sps_max_sub_layers_minus1 is parsed by u(3).
I corrected it in my fork
Useful! but there is one missing.
Where is the definition of "scaling_list_data" ?
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
AAAAAUABDAH//wFgAAADALAAAAMAAAMAP6oCQAAAAAFCAQEBYAAAAwCwAAADAAADAD+gBQIBaWNq pJMvkAAAAAFEAcDy8DyQAAAAAUQBwPLwPJAAAAABRAHA8vA8kA==leads to
!! Found NAL @ offset 4 (0x4)
forbidden_zero_bit 0
nal_unit_type 32
...
Video parameter Set RBSP
========================
...
Profile Tier Level
==================
general_profile_space 0
general_tier_flag 0
general_profile_idc 1
general_profile_compatibility_flag[ 0] 0
general_profile_compatibility_flag[ 1] 1
general_profile_compatibility_flag[ 2] 1
...
general_progressive_source_flag 1
general_interlaced_source_flag 0
general_non_packed_constraint_flag 1
general_frame_only_constraint_flag 1
general_reserved_zero_44bits 0
general_level_idc 63
...
!! Found NAL @ offset 32 (0x20)
forbidden_zero_bit 0
nal_unit_type 33
...
...
Profile Tier Level
==================
general_profile_space 1
general_tier_flag 0
general_profile_idc 0
general_profile_compatibility_flag[ 0] 0
general_profile_compatibility_flag[ 1] 1
general_profile_compatibility_flag[ 2] 0
general_profile_compatibility_flag[ 3] 1
general_profile_compatibility_flag[ 4] 1
general_profile_compatibility_flag[ 5] 0
...
general_progressive_source_flag 0
general_interlaced_source_flag 0
general_non_packed_constraint_flag 1
general_frame_only_constraint_flag 0
! general_reserved_zero_44bits 13194139533312
! general_level_idc 15