//Creates and saves the NAL PPS (one per file)
void CJOCh264encoder::create_pps ()
{
add4bytesnoemulationprevention (0x000001); // NAL header
addbits (0x0,1); // forbidden_bit
addbits (0x3,2); // nal_ref_idc
addbits (0x8,5); // nal_unit_type : 8 ( PPS )
addexpgolombunsigned(0); // pic_parameter_set_id
addexpgolombunsigned(0); // seq_parameter_set_id
addbits (0x0,1); // entropy_coding_mode_flag
addbits (0x0,1); // bottom_field_pic_order_in frame_present_flag
addexpgolombunsigned(0); // nun_slices_groups_minus1
addexpgolombunsigned(0); // num_ref_idx10_default_active_minus
addexpgolombunsigned(0); // num_ref_idx11_default_active_minus
addbits (0x0,1); // weighted_pred_flag
addbits (0x0,2); // weighted_bipred_idc
addexpgolombsigned(0); // pic_init_qp_minus26
addexpgolombsigned(0); // pic_init_qs_minus26
addexpgolombsigned(0); // chroma_qp_index_offset
addbits (0x0,1); //deblocking_filter_present_flag
addbits (0x0,1); // constrained_intra_pred_flag
addbits (0x0,1); //redundant_pic_ent_present_flag
addbits(0x1,1); // rbsp stop bit
dobytealign();
}
void CJOCh264bitstream::addexpgolombsigned (long lval)
{
//it implements a signed exp golomb coding
unsigned long lvalint = abs(lval) * 2 - 1;
if (lval <= 0)
lvalint = 2 * abs(lval);
addexpgolombunsigned(lvalint);
}
//Creates and saves the NAL SLICE (one per frame)
void CJOCh264encoder::create_slice_header(unsigned long lFrameNum)
{
add4bytesnoemulationprevention (0x000001); // NAL header
addbits (0x0,1); // forbidden_bit
addbits (0x3,2); // nal_ref_idc
addbits (0x5,5); // nal_unit_type : 5 ( Coded slice of an IDR picture )
addexpgolombunsigned(0); // first_mb_in_slice
addexpgolombunsigned(7); // slice_type
addexpgolombunsigned(0); // pic_param_set_id
unsigned char cFrameNum = lFrameNum % 16; //(2⁴)
addbits (cFrameNum,4); // frame_num ( numbits = v = log2_max_frame_num_minus4 + 4)
unsigned long lidr_pic_id = lFrameNum % 512;
//idr_pic_flag = 1
addexpgolombunsigned(lidr_pic_id); // idr_pic_id
addbits(0x0,4); // pic_order_cnt_lsb (numbits = v = log2_max_fpic_order_cnt_lsb_minus4 + 4)
addbits(0x0,1); //no_output_of_prior_pics_flag
addbits(0x0,1); //long_term_reference_flag
addexpgolombsigned(0); //slice_qp_delta
//Probably NOT byte aligned!!!
}
//Creates and saves the NAL SPS (including VUI) (one per file)
void CJOCh264encoder::create_sps (int nImW, int nImH, int nMbW, int nMbH, int nFps, int nSARw, int nSARh)
{
add4bytesnoemulationprevention (0x000001); // NAL header
addbits (0x0,1); // forbidden_bit
addbits (0x3,2); // nal_ref_idc
addbits (0x7,5); // nal_unit_type : 7 ( SPS )
addbits (0x42,8); // profile_idc = baseline ( 0x42 )
addbits (0x0,1); // constraint_set0_flag
addbits (0x0,1); // constraint_set1_flag
addbits (0x0,1); // constraint_set2_flag
addbits (0x0,1); // constraint_set3_flag
addbits (0x0,1); // constraint_set4_flag
addbits (0x0,1); // constraint_set5_flag
addbits (0x0,2); // reserved_zero_2bits /* equal to 0 */
addbits (0x0a,8); // level_idc: 3.1 (0x0a)
addexpgolombunsigned(0); // seq_parameter_set_id
addexpgolombunsigned(0); // log2_max_frame_num_minus4
addexpgolombunsigned(0); // pic_order_cnt_type
addexpgolombunsigned(0); // log2_max_pic_order_cnt_lsb_minus4
addexpgolombunsigned(0); // max_num_refs_frames
addbits(0x0,1); // gaps_in_frame_num_value_allowed_flag
int nWinMbs = nImW / nMbW;
addexpgolombunsigned(nWinMbs-1); // pic_width_in_mbs_minus_1
int nHinMbs = nImH / nMbH;
addexpgolombunsigned(nHinMbs-1); // pic_height_in_map_units_minus_1
addbits(0x1,1); // frame_mbs_only_flag
addbits(0x0,1); // direct_8x8_interfernce
addbits(0x0,1); // frame_cropping_flag
addbits(0x1,1); // vui_parameter_present
//VUI parameters (AR, timming)
addbits(0x1,1); //aspect_ratio_info_present_flag
addbits(0xFF,8); //aspect_ratio_idc = Extended_SAR
//AR
addbits(nSARw, 16); //sar_width
addbits(nSARh, 16); //sar_height
addbits(0x0,1); //overscan_info_present_flag
addbits(0x0,1); //video_signal_type_present_flag
addbits(0x0,1); //chroma_loc_info_present_flag
addbits(0x1,1); //timing_info_present_flag
unsigned int nnum_units_in_tick = TIME_SCALE_IN_HZ / (2*nFps);
addbits(nnum_units_in_tick,32); //num_units_in_tick
addbits(TIME_SCALE_IN_HZ,32); //time_scale
addbits(0x1,1); //fixed_frame_rate_flag
addbits(0x0,1); //nal_hrd_parameters_present_flag
addbits(0x0,1); //vcl_hrd_parameters_present_flag
addbits(0x0,1); //pic_struct_present_flag
addbits(0x0,1); //bitstream_restriction_flag
//END VUI
addbits(0x0,1); // frame_mbs_only_flag
addbits(0x1,1); // rbsp stop bit
dobytealign();
}
//Creates and saves the macroblock header(one per macroblock)
void CJOCh264encoder::create_macroblock_header ()
{
addexpgolombunsigned(25); // mb_type (I_PCM)
}