85cc8cb9
 Hu Chunming
ๅ็ไปฃ็
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#include "H265ParseSPS.h"
bool ParseSequenceParameterSet(int8* data, int size, vc_params_t& params)
{
if (size < 20) { return false; }
NALBitstream bs(data, size);
// seq_parameter_set_rbsp()
bs.GetWord(4);// sps_video_parameter_set_id
int sps_max_sub_layers_minus1 = bs.GetWord(3); // "The value of sps_max_sub_layers_minus1 shall be in the range of 0 to 6, inclusive."
if (sps_max_sub_layers_minus1 > 6) {return false;}
bs.GetWord(1);
// sps_temporal_id_nesting_flag
// profile_tier_level( sps_max_sub_layers_minus1 )
{
bs.GetWord(2);// general_profile_space
bs.GetWord(1);// general_tier_flag
params.profile = bs.GetWord(5);// general_profile_idc
bs.GetWord(32);// general_profile_compatibility_flag[32]
bs.GetWord(1);// general_progressive_source_flag
bs.GetWord(1);// general_interlaced_source_flag
bs.GetWord(1);// general_non_packed_constraint_flag
bs.GetWord(1);// general_frame_only_constraint_flag
bs.GetWord(44);// general_reserved_zero_44bits
params.level = bs.GetWord(8);// general_level_idc
uint8 sub_layer_profile_present_flag[6] = {0};
uint8 sub_layer_level_present_flag[6] = {0};
for(int i = 0; i < sps_max_sub_layers_minus1; i++)
{
sub_layer_profile_present_flag[i]= bs.GetWord(1);
sub_layer_level_present_flag[i]= bs.GetWord(1);
}
if (sps_max_sub_layers_minus1 > 0)
{
for (int i = sps_max_sub_layers_minus1; i < 8; i++)
{
uint8 reserved_zero_2bits = bs.GetWord(2);
}
}
for (int i = 0; i < sps_max_sub_layers_minus1; i++)
{
if (sub_layer_profile_present_flag[i])
{
bs.GetWord(2);// sub_layer_profile_space[i]
bs.GetWord(1);// sub_layer_tier_flag[i]
bs.GetWord(5);// sub_layer_profile_idc[i]
bs.GetWord(32);// sub_layer_profile_compatibility_flag[i][32]
bs.GetWord(1);// sub_layer_progressive_source_flag[i]
bs.GetWord(1);// sub_layer_interlaced_source_flag[i]
bs.GetWord(1);// sub_layer_non_packed_constraint_flag[i]
bs.GetWord(1);// sub_layer_frame_only_constraint_flag[i]
bs.GetWord(44);// sub_layer_reserved_zero_44bits[i]
}
if (sub_layer_level_present_flag[i])
{
bs.GetWord(8);// sub_layer_level_idc[i]
}
}
}
uint32 sps_seq_parameter_set_id= bs.GetUE(); // "The value of sps_seq_parameter_set_id shall be in the range of 0 to 15, inclusive."
if (sps_seq_parameter_set_id > 15)
{
return false;
}
uint32 chroma_format_idc = bs.GetUE(); // "The value of chroma_format_idc shall be in the range of 0 to 3, inclusive."
if (sps_seq_parameter_set_id > 3)
{
return false;
}
if (chroma_format_idc == 3)
{
bs.GetWord(1);// separate_colour_plane_flag
}
params.width = bs.GetUE(); // pic_width_in_luma_samples
params.height = bs.GetUE(); // pic_height_in_luma_samples
if (bs.GetWord(1))
{// conformance_window_flag
bs.GetUE();
// conf_win_left_offset
bs.GetUE();
// conf_win_right_offset
bs.GetUE();
// conf_win_top_offset
bs.GetUE();
// conf_win_bottom_offset
}
uint32 bit_depth_luma_minus8= bs.GetUE();
uint32 bit_depth_chroma_minus8= bs.GetUE();
if (bit_depth_luma_minus8 != bit_depth_chroma_minus8)
{
return false;
}
return true;
}
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