void CJOCh264bitstream::add4bytesnoemulationprevention (unsigned int nVal, bool bDoAlign)
{
//Used to add NAL header stream
//Remember: NAL header is byte oriented
if (bDoAlign == true)
dobytealign();
if ((m_nLastbitinbuffer % 8) != 0)
throw "Error: Save to file must be byte aligned";
while (m_nLastbitinbuffer != 0)
savebufferbyte();
unsigned char cbyte = (nVal & 0xFF000000)>>24;
fwrite(&cbyte, 1, 1, m_pOutFile);
cbyte = (nVal & 0x00FF0000)>>16;
fwrite(&cbyte, 1, 1, m_pOutFile);
cbyte = (nVal & 0x0000FF00)>>8;
fwrite(&cbyte, 1, 1, m_pOutFile);
cbyte = (nVal & 0x000000FF);
fwrite(&cbyte, 1, 1, m_pOutFile);
}
//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::close()
{
//Flush the data in stream buffer
dobytealign();
while (m_nLastbitinbuffer != 0)
savebufferbyte();
}
//Codifies & save the video frame (it only uses 16x16 intra PCM -> NO COMPRESSION!)
void CJOCh264encoder::CodeAndSaveFrame()
{
//The slice header is not byte aligned, so the first macroblock header is not byte aligned
create_slice_header (m_lNumFramesAdded);
//Loop over macroblock size
unsigned int y,x;
for (y = 0; y < m_frame.nYheight / m_frame.nYmbheight; y++)
{
for (x = 0; x < m_frame.nYwidth / m_frame.nYmbwidth; x++)
{
create_macroblock(y, x);
}
}
create_slice_footer();
dobytealign();
m_lNumFramesAdded++;
}
//Creates & saves a macroblock (coded INTRA 16x16)
void CJOCh264encoder::create_macroblock(unsigned int nYpos, unsigned int nXpos)
{
unsigned int x,y;
create_macroblock_header();
dobytealign();
//Y
unsigned int nYsize = m_frame.nYwidth * m_frame.nYheight;
for(y = nYpos * m_frame.nYmbheight; y < (nYpos+1) * m_frame.nYmbheight; y++)
{
for (x = nXpos * m_frame.nYmbwidth; x < (nXpos+1) * m_frame.nYmbwidth; x++)
{
addbyte (m_frame.yuv420pframe.pYCbCr[(y * m_frame.nYwidth + x)]);
}
}
//Cb
unsigned int nCsize = m_frame.nCwidth * m_frame.nCheight;
for(y = nYpos * m_frame.nCmbheight; y < (nYpos+1) * m_frame.nCmbheight; y++)
{
for (x = nXpos * m_frame.nCmbwidth; x < (nXpos+1) * m_frame.nCmbwidth; x++)
{
addbyte(m_frame.yuv420pframe.pYCbCr[nYsize + (y * m_frame.nCwidth + x)]);
}
}
//Cr
for(y = nYpos * m_frame.nCmbheight; y < (nYpos+1) * m_frame.nCmbheight; y++)
{
for (x = nXpos * m_frame.nCmbwidth; x < (nXpos+1) * m_frame.nCmbwidth; x++)
{
addbyte(m_frame.yuv420pframe.pYCbCr[nYsize + nCsize + (y * m_frame.nCwidth + x)]);
}
}
}
//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();
}
