void H264VideoStreamParser
::analyze_seq_parameter_set_data(unsigned& num_units_in_tick, unsigned& time_scale, unsigned& fixed_frame_rate_flag) {
num_units_in_tick = time_scale = fixed_frame_rate_flag = 0; // default values
// Begin by making a copy of the NAL unit data, removing any 'emulation prevention' bytes:
u_int8_t sps[SPS_MAX_SIZE];
unsigned spsSize;
removeEmulationBytes(sps, sizeof sps, spsSize);
BitVector bv(sps, 0, 8*spsSize);
bv.skipBits(8); // forbidden_zero_bit; nal_ref_idc; nal_unit_type
unsigned profile_idc = bv.getBits(8);
DEBUG_PRINT(profile_idc);
unsigned constraint_setN_flag = bv.getBits(8); // also "reserved_zero_2bits" at end
DEBUG_PRINT(constraint_setN_flag);
unsigned level_idc = bv.getBits(8);
DEBUG_PRINT(level_idc);
unsigned seq_parameter_set_id = bv.get_expGolomb();
DEBUG_PRINT(seq_parameter_set_id);
if (profile_idc == 100 || profile_idc == 110 || profile_idc == 122 || profile_idc == 244 || profile_idc == 44 || profile_idc == 83 || profile_idc == 86 || profile_idc == 118 || profile_idc == 128 ) {
DEBUG_TAB;
unsigned chroma_format_idc = bv.get_expGolomb();
DEBUG_PRINT(chroma_format_idc);
if (chroma_format_idc == 3) {
DEBUG_TAB;
separate_colour_plane_flag = bv.get1BitBoolean();
DEBUG_PRINT(separate_colour_plane_flag);
}
(void)bv.get_expGolomb(); // bit_depth_luma_minus8
(void)bv.get_expGolomb(); // bit_depth_chroma_minus8
bv.skipBits(1); // qpprime_y_zero_transform_bypass_flag
unsigned seq_scaling_matrix_present_flag = bv.get1Bit();
DEBUG_PRINT(seq_scaling_matrix_present_flag);
if (seq_scaling_matrix_present_flag) {
for (int i = 0; i < ((chroma_format_idc != 3) ? 8 : 12); ++i) {
DEBUG_TAB;
DEBUG_PRINT(i);
unsigned seq_scaling_list_present_flag = bv.get1Bit();
DEBUG_PRINT(seq_scaling_list_present_flag);
if (seq_scaling_list_present_flag) {
DEBUG_TAB;
unsigned sizeOfScalingList = i < 6 ? 16 : 64;
unsigned lastScale = 8;
unsigned nextScale = 8;
for (unsigned j = 0; j < sizeOfScalingList; ++j) {
DEBUG_TAB;
DEBUG_PRINT(j);
DEBUG_PRINT(nextScale);
if (nextScale != 0) {
DEBUG_TAB;
unsigned delta_scale = bv.get_expGolomb();
DEBUG_PRINT(delta_scale);
nextScale = (lastScale + delta_scale + 256) % 256;
}
lastScale = (nextScale == 0) ? lastScale : nextScale;
DEBUG_PRINT(lastScale);
}
}
}
}
}
unsigned log2_max_frame_num_minus4 = bv.get_expGolomb();
DEBUG_PRINT(log2_max_frame_num_minus4);
log2_max_frame_num = log2_max_frame_num_minus4 + 4;
unsigned pic_order_cnt_type = bv.get_expGolomb();
DEBUG_PRINT(pic_order_cnt_type);
if (pic_order_cnt_type == 0) {
DEBUG_TAB;
unsigned log2_max_pic_order_cnt_lsb_minus4 = bv.get_expGolomb();
DEBUG_PRINT(log2_max_pic_order_cnt_lsb_minus4);
} else if (pic_order_cnt_type == 1) {
DEBUG_TAB;
bv.skipBits(1); // delta_pic_order_always_zero_flag
(void)bv.get_expGolomb(); // offset_for_non_ref_pic
(void)bv.get_expGolomb(); // offset_for_top_to_bottom_field
unsigned num_ref_frames_in_pic_order_cnt_cycle = bv.get_expGolomb();
DEBUG_PRINT(num_ref_frames_in_pic_order_cnt_cycle);
for (unsigned i = 0; i < num_ref_frames_in_pic_order_cnt_cycle; ++i) {
(void)bv.get_expGolomb(); // offset_for_ref_frame[i]
}
}
unsigned max_num_ref_frames = bv.get_expGolomb();
DEBUG_PRINT(max_num_ref_frames);
unsigned gaps_in_frame_num_value_allowed_flag = bv.get1Bit();
DEBUG_PRINT(gaps_in_frame_num_value_allowed_flag);
unsigned pic_width_in_mbs_minus1 = bv.get_expGolomb();
DEBUG_PRINT(pic_width_in_mbs_minus1);
unsigned pic_height_in_map_units_minus1 = bv.get_expGolomb();
DEBUG_PRINT(pic_height_in_map_units_minus1);
frame_mbs_only_flag = bv.get1BitBoolean();
DEBUG_PRINT(frame_mbs_only_flag);
if (!frame_mbs_only_flag) {
bv.skipBits(1); // mb_adaptive_frame_field_flag
}
bv.skipBits(1); // direct_8x8_inference_flag
unsigned frame_cropping_flag = bv.get1Bit();
DEBUG_PRINT(frame_cropping_flag);
if (frame_cropping_flag) {
(void)bv.get_expGolomb(); // frame_crop_left_offset
(void)bv.get_expGolomb(); // frame_crop_right_offset
(void)bv.get_expGolomb(); // frame_crop_top_offset
(void)bv.get_expGolomb(); // frame_crop_bottom_offset
}
unsigned vui_parameters_present_flag = bv.get1Bit();
DEBUG_PRINT(vui_parameters_present_flag);
if (vui_parameters_present_flag) {
DEBUG_TAB;
analyze_vui_parameters(bv,num_units_in_tick, time_scale, fixed_frame_rate_flag);
}
}
void H264or5VideoStreamParser
::analyze_seq_parameter_set_data(unsigned& num_units_in_tick, unsigned& time_scale) {
num_units_in_tick = time_scale = 0; // default values
// Begin by making a copy of the NAL unit data, removing any 'emulation prevention' bytes:
u_int8_t sps[SPS_MAX_SIZE];
unsigned spsSize;
removeEmulationBytes(sps, sizeof sps, spsSize);
BitVector bv(sps, 0, 8*spsSize);
if (fHNumber == 264) {
bv.skipBits(8); // forbidden_zero_bit; nal_ref_idc; nal_unit_type
unsigned profile_idc = bv.getBits(8);
DEBUG_PRINT(profile_idc);
unsigned constraint_setN_flag = bv.getBits(8); // also "reserved_zero_2bits" at end
DEBUG_PRINT(constraint_setN_flag);
unsigned level_idc = bv.getBits(8);
DEBUG_PRINT(level_idc);
unsigned seq_parameter_set_id = bv.get_expGolomb();
DEBUG_PRINT(seq_parameter_set_id);
if (profile_idc == 100 || profile_idc == 110 || profile_idc == 122 || profile_idc == 244 || profile_idc == 44 || profile_idc == 83 || profile_idc == 86 || profile_idc == 118 || profile_idc == 128 ) {
DEBUG_TAB;
unsigned chroma_format_idc = bv.get_expGolomb();
DEBUG_PRINT(chroma_format_idc);
if (chroma_format_idc == 3) {
DEBUG_TAB;
Boolean separate_colour_plane_flag = bv.get1BitBoolean();
DEBUG_PRINT(separate_colour_plane_flag);
}
(void)bv.get_expGolomb(); // bit_depth_luma_minus8
(void)bv.get_expGolomb(); // bit_depth_chroma_minus8
bv.skipBits(1); // qpprime_y_zero_transform_bypass_flag
Boolean seq_scaling_matrix_present_flag = bv.get1BitBoolean();
DEBUG_PRINT(seq_scaling_matrix_present_flag);
if (seq_scaling_matrix_present_flag) {
for (int i = 0; i < ((chroma_format_idc != 3) ? 8 : 12); ++i) {
DEBUG_TAB;
DEBUG_PRINT(i);
Boolean seq_scaling_list_present_flag = bv.get1BitBoolean();
DEBUG_PRINT(seq_scaling_list_present_flag);
if (seq_scaling_list_present_flag) {
DEBUG_TAB;
unsigned sizeOfScalingList = i < 6 ? 16 : 64;
unsigned lastScale = 8;
unsigned nextScale = 8;
for (unsigned j = 0; j < sizeOfScalingList; ++j) {
DEBUG_TAB;
DEBUG_PRINT(j);
DEBUG_PRINT(nextScale);
if (nextScale != 0) {
DEBUG_TAB;
unsigned delta_scale = bv.get_expGolomb();
DEBUG_PRINT(delta_scale);
nextScale = (lastScale + delta_scale + 256) % 256;
}
lastScale = (nextScale == 0) ? lastScale : nextScale;
DEBUG_PRINT(lastScale);
}
}
}
}
}
unsigned log2_max_frame_num_minus4 = bv.get_expGolomb();
DEBUG_PRINT(log2_max_frame_num_minus4);
unsigned pic_order_cnt_type = bv.get_expGolomb();
DEBUG_PRINT(pic_order_cnt_type);
if (pic_order_cnt_type == 0) {
DEBUG_TAB;
unsigned log2_max_pic_order_cnt_lsb_minus4 = bv.get_expGolomb();
DEBUG_PRINT(log2_max_pic_order_cnt_lsb_minus4);
} else if (pic_order_cnt_type == 1) {
DEBUG_TAB;
bv.skipBits(1); // delta_pic_order_always_zero_flag
(void)bv.get_expGolomb(); // offset_for_non_ref_pic
(void)bv.get_expGolomb(); // offset_for_top_to_bottom_field
unsigned num_ref_frames_in_pic_order_cnt_cycle = bv.get_expGolomb();
DEBUG_PRINT(num_ref_frames_in_pic_order_cnt_cycle);
for (unsigned i = 0; i < num_ref_frames_in_pic_order_cnt_cycle; ++i) {
(void)bv.get_expGolomb(); // offset_for_ref_frame[i]
}
}
unsigned max_num_ref_frames = bv.get_expGolomb();
DEBUG_PRINT(max_num_ref_frames);
Boolean gaps_in_frame_num_value_allowed_flag = bv.get1BitBoolean();
DEBUG_PRINT(gaps_in_frame_num_value_allowed_flag);
unsigned pic_width_in_mbs_minus1 = bv.get_expGolomb();
DEBUG_PRINT(pic_width_in_mbs_minus1);
unsigned pic_height_in_map_units_minus1 = bv.get_expGolomb();
DEBUG_PRINT(pic_height_in_map_units_minus1);
Boolean frame_mbs_only_flag = bv.get1BitBoolean();
DEBUG_PRINT(frame_mbs_only_flag);
if (!frame_mbs_only_flag) {
bv.skipBits(1); // mb_adaptive_frame_field_flag
}
bv.skipBits(1); // direct_8x8_inference_flag
Boolean frame_cropping_flag = bv.get1BitBoolean();
DEBUG_PRINT(frame_cropping_flag);
if (frame_cropping_flag) {
(void)bv.get_expGolomb(); // frame_crop_left_offset
(void)bv.get_expGolomb(); // frame_crop_right_offset
(void)bv.get_expGolomb(); // frame_crop_top_offset
(void)bv.get_expGolomb(); // frame_crop_bottom_offset
}
Boolean vui_parameters_present_flag = bv.get1BitBoolean();
DEBUG_PRINT(vui_parameters_present_flag);
if (vui_parameters_present_flag) {
DEBUG_TAB;
analyze_vui_parameters(bv, num_units_in_tick, time_scale);
}
} else { // 265
unsigned i;
bv.skipBits(16); // nal_unit_header
bv.skipBits(4); // sps_video_parameter_set_id
unsigned sps_max_sub_layers_minus1 = bv.getBits(3);
DEBUG_PRINT(sps_max_sub_layers_minus1);
bv.skipBits(1); // sps_temporal_id_nesting_flag
profile_tier_level(bv, sps_max_sub_layers_minus1);
(void)bv.get_expGolomb(); // sps_seq_parameter_set_id
unsigned chroma_format_idc = bv.get_expGolomb();
DEBUG_PRINT(chroma_format_idc);
if (chroma_format_idc == 3) bv.skipBits(1); // separate_colour_plane_flag
unsigned pic_width_in_luma_samples = bv.get_expGolomb();
DEBUG_PRINT(pic_width_in_luma_samples);
unsigned pic_height_in_luma_samples = bv.get_expGolomb();
DEBUG_PRINT(pic_height_in_luma_samples);
Boolean conformance_window_flag = bv.get1BitBoolean();
DEBUG_PRINT(conformance_window_flag);
if (conformance_window_flag) {
DEBUG_TAB;
unsigned conf_win_left_offset = bv.get_expGolomb();
DEBUG_PRINT(conf_win_left_offset);
unsigned conf_win_right_offset = bv.get_expGolomb();
DEBUG_PRINT(conf_win_right_offset);
unsigned conf_win_top_offset = bv.get_expGolomb();
DEBUG_PRINT(conf_win_top_offset);
unsigned conf_win_bottom_offset = bv.get_expGolomb();
DEBUG_PRINT(conf_win_bottom_offset);
}
(void)bv.get_expGolomb(); // bit_depth_luma_minus8
(void)bv.get_expGolomb(); // bit_depth_chroma_minus8
unsigned log2_max_pic_order_cnt_lsb_minus4 = bv.get_expGolomb();
Boolean sps_sub_layer_ordering_info_present_flag = bv.get1BitBoolean();
DEBUG_PRINT(sps_sub_layer_ordering_info_present_flag);
for (i = (sps_sub_layer_ordering_info_present_flag ? 0 : sps_max_sub_layers_minus1);
i <= sps_max_sub_layers_minus1; ++i) {
(void)bv.get_expGolomb(); // sps_max_dec_pic_buffering_minus1[i]
(void)bv.get_expGolomb(); // sps_max_num_reorder_pics[i]
(void)bv.get_expGolomb(); // sps_max_latency_increase[i]
}
(void)bv.get_expGolomb(); // log2_min_luma_coding_block_size_minus3
(void)bv.get_expGolomb(); // log2_diff_max_min_luma_coding_block_size
(void)bv.get_expGolomb(); // log2_min_transform_block_size_minus2
(void)bv.get_expGolomb(); // log2_diff_max_min_transform_block_size
(void)bv.get_expGolomb(); // max_transform_hierarchy_depth_inter
(void)bv.get_expGolomb(); // max_transform_hierarchy_depth_intra
Boolean scaling_list_enabled_flag = bv.get1BitBoolean();
DEBUG_PRINT(scaling_list_enabled_flag);
if (scaling_list_enabled_flag) {
DEBUG_TAB;
Boolean sps_scaling_list_data_present_flag = bv.get1BitBoolean();
DEBUG_PRINT(sps_scaling_list_data_present_flag);
if (sps_scaling_list_data_present_flag) {
// scaling_list_data()
DEBUG_TAB;
for (unsigned sizeId = 0; sizeId < 4; ++sizeId) {
DEBUG_PRINT(sizeId);
for (unsigned matrixId = 0; matrixId < (sizeId == 3 ? 2 : 6); ++matrixId) {
DEBUG_TAB;
DEBUG_PRINT(matrixId);
Boolean scaling_list_pred_mode_flag = bv.get1BitBoolean();
DEBUG_PRINT(scaling_list_pred_mode_flag);
if (!scaling_list_pred_mode_flag) {
(void)bv.get_expGolomb(); // scaling_list_pred_matrix_id_delta[sizeId][matrixId]
} else {
unsigned const c = 1 << (4+(sizeId<<1));
unsigned coefNum = c < 64 ? c : 64;
if (sizeId > 1) {
(void)bv.get_expGolomb(); // scaling_list_dc_coef_minus8[sizeId][matrixId]
}
for (i = 0; i < coefNum; ++i) {
(void)bv.get_expGolomb(); // scaling_list_delta_coef
}
}
}
}
}
}
bv.skipBits(2); // amp_enabled_flag, sample_adaptive_offset_enabled_flag
Boolean pcm_enabled_flag = bv.get1BitBoolean();
DEBUG_PRINT(pcm_enabled_flag);
if (pcm_enabled_flag) {
bv.skipBits(8); // pcm_sample_bit_depth_luma_minus1, pcm_sample_bit_depth_chroma_minus1
(void)bv.get_expGolomb(); // log2_min_pcm_luma_coding_block_size_minus3
(void)bv.get_expGolomb(); // log2_diff_max_min_pcm_luma_coding_block_size
bv.skipBits(1); // pcm_loop_filter_disabled_flag
}
unsigned num_short_term_ref_pic_sets = bv.get_expGolomb();
DEBUG_PRINT(num_short_term_ref_pic_sets);
unsigned num_negative_pics = 0, prev_num_negative_pics = 0;
unsigned num_positive_pics = 0, prev_num_positive_pics = 0;
for (i = 0; i < num_short_term_ref_pic_sets; ++i) {
// short_term_ref_pic_set(i):
DEBUG_TAB;
DEBUG_PRINT(i);
Boolean inter_ref_pic_set_prediction_flag = False;
if (i != 0) {
inter_ref_pic_set_prediction_flag = bv.get1BitBoolean();
}
DEBUG_PRINT(inter_ref_pic_set_prediction_flag);
if (inter_ref_pic_set_prediction_flag) {
DEBUG_TAB;
if (i == num_short_term_ref_pic_sets) {
// This can't happen here, but it's in the spec, so we include it for completeness
(void)bv.get_expGolomb(); // delta_idx_minus1
}
bv.skipBits(1); // delta_rps_sign
(void)bv.get_expGolomb(); // abs_delta_rps_minus1
unsigned NumDeltaPocs = prev_num_negative_pics + prev_num_positive_pics; // correct???
for (unsigned j = 0; j < NumDeltaPocs; ++j) {
DEBUG_PRINT(j);
Boolean used_by_curr_pic_flag = bv.get1BitBoolean();
DEBUG_PRINT(used_by_curr_pic_flag);
if (!used_by_curr_pic_flag) bv.skipBits(1); // use_delta_flag[j]
}
} else {
prev_num_negative_pics = num_negative_pics;
num_negative_pics = bv.get_expGolomb();
DEBUG_PRINT(num_negative_pics);
prev_num_positive_pics = num_positive_pics;
num_positive_pics = bv.get_expGolomb();
DEBUG_PRINT(num_positive_pics);
unsigned k;
for (k = 0; k < num_negative_pics; ++k) {
(void)bv.get_expGolomb(); // delta_poc_s0_minus1[k]
bv.skipBits(1); // used_by_curr_pic_s0_flag[k]
}
for (k = 0; k < num_positive_pics; ++k) {
(void)bv.get_expGolomb(); // delta_poc_s1_minus1[k]
bv.skipBits(1); // used_by_curr_pic_s1_flag[k]
}
}
}
Boolean long_term_ref_pics_present_flag = bv.get1BitBoolean();
DEBUG_PRINT(long_term_ref_pics_present_flag);
if (long_term_ref_pics_present_flag) {
DEBUG_TAB;
unsigned num_long_term_ref_pics_sps = bv.get_expGolomb();
DEBUG_PRINT(num_long_term_ref_pics_sps);
for (i = 0; i < num_long_term_ref_pics_sps; ++i) {
bv.skipBits(log2_max_pic_order_cnt_lsb_minus4); // lt_ref_pic_poc_lsb_sps[i]
bv.skipBits(1); // used_by_curr_pic_lt_sps_flag[1]
}
}
bv.skipBits(2); // sps_temporal_mvp_enabled_flag, strong_intra_smoothing_enabled_flag
Boolean vui_parameters_present_flag = bv.get1BitBoolean();
DEBUG_PRINT(vui_parameters_present_flag);
if (vui_parameters_present_flag) {
DEBUG_TAB;
analyze_vui_parameters(bv, num_units_in_tick, time_scale);
}
Boolean sps_extension_flag = bv.get1BitBoolean();
DEBUG_PRINT(sps_extension_flag);
}
}