private static void ReadHRDParameters(BitStreamReader bitReader, ref HRDParameters hrd)
{
hrd = new HRDParameters();
hrd.cpb_cnt_minus1 = bitReader.ReadUE();
hrd.bit_rate_scale = (int)bitReader.ReadNBit(4);
hrd.cpb_size_scale = (int)bitReader.ReadNBit(4);
hrd.bit_rate_value_minus1 = new int[hrd.cpb_cnt_minus1 + 1];
hrd.cpb_size_value_minus1 = new int[hrd.cpb_cnt_minus1 + 1];
hrd.cbr_flag = new bool[hrd.cpb_cnt_minus1 + 1];
for (int SchedSelIdx = 0; SchedSelIdx <= hrd.cpb_cnt_minus1; SchedSelIdx++)
{
hrd.bit_rate_value_minus1[SchedSelIdx] = bitReader.ReadUE();
hrd.cpb_size_value_minus1[SchedSelIdx] = bitReader.ReadUE();
hrd.cbr_flag[SchedSelIdx] = bitReader.ReadBool();
}
hrd.initial_cpb_removal_delay_length_minus1 = (int)bitReader.ReadNBit(5);
hrd.cpb_removal_delay_length_minus1 = (int)bitReader.ReadNBit(5);
hrd.dpb_output_delay_length_minus1 = (int)bitReader.ReadNBit(5);
hrd.time_offset_length = (int)bitReader.ReadNBit(5);
}
private static void ReadVUIParameters(BitStreamReader bitReader, ref VUIParameters vuip)
{
vuip = new VUIParameters();
vuip.aspect_ratio_info_present_flag = bitReader.ReadBool();
if (vuip.aspect_ratio_info_present_flag)
{
vuip.aspect_ratio = bitReader.ReadNBit(8);
if (vuip.aspect_ratio == 255) //Extended SAR
{
vuip.sar_width = bitReader.ReadNBit(16);
vuip.sar_height = bitReader.ReadNBit(16);
}
}
vuip.overscan_info_present_flag = bitReader.ReadBool();
if (vuip.overscan_info_present_flag)
{
vuip.overscan_appropriate_flag = bitReader.ReadBool();
}
vuip.video_signal_type_present_flag = bitReader.ReadBool();
if (vuip.video_signal_type_present_flag)
{
vuip.video_format = bitReader.ReadNBit(3);
vuip.video_full_range_flag = bitReader.ReadBool();
vuip.colour_description_present_flag = bitReader.ReadBool();
if (vuip.colour_description_present_flag)
{
vuip.colour_primaries = bitReader.ReadNBit(8);
vuip.transfer_characteristics = bitReader.ReadNBit(8);
vuip.matrix_coefficients = bitReader.ReadNBit(8);
}
}
vuip.chroma_loc_info_present_flag = bitReader.ReadBool();
if (vuip.chroma_loc_info_present_flag)
{
vuip.chroma_sample_loc_type_top_field = bitReader.ReadUE();
vuip.chroma_sample_loc_type_bottom_field = bitReader.ReadUE();
}
vuip.timing_info_present_flag = bitReader.ReadBool();
if (vuip.timing_info_present_flag)
{
vuip.num_units_in_tick = bitReader.ReadNBit(32);
vuip.time_scale = bitReader.ReadNBit(32);
vuip.fixed_frame_rate_flag = bitReader.ReadBool();
}
bool nal_hrd_parameters_present_flag = bitReader.ReadBool();
if (nal_hrd_parameters_present_flag)
{
ReadHRDParameters(bitReader, ref vuip.nalHRDParams);
}
bool vcl_hrd_parameters_present_flag = bitReader.ReadBool();
if (vcl_hrd_parameters_present_flag)
{
ReadHRDParameters(bitReader, ref vuip.vclHRDParams);
}
if (nal_hrd_parameters_present_flag || vcl_hrd_parameters_present_flag)
{
vuip.low_delay_hrd_flag = bitReader.ReadBool();
}
vuip.pic_struct_present_flag = bitReader.ReadBool();
bool bitstream_restriction_flag = bitReader.ReadBool();
if (bitstream_restriction_flag)
{
vuip.bitstreamRestriction = new VUIParameters.BitstreamRestriction();
vuip.bitstreamRestriction.motion_vectors_over_pic_boundaries_flag = bitReader.ReadBool();
vuip.bitstreamRestriction.max_bytes_per_pic_denom = bitReader.ReadUE();
vuip.bitstreamRestriction.max_bits_per_mb_denom = bitReader.ReadUE();
vuip.bitstreamRestriction.log2_max_mv_length_horizontal = bitReader.ReadUE();
vuip.bitstreamRestriction.log2_max_mv_length_vertical = bitReader.ReadUE();
vuip.bitstreamRestriction.num_reorder_frames = bitReader.ReadUE();
vuip.bitstreamRestriction.max_dec_frame_buffering = bitReader.ReadUE();
}
}
public static SeqParameterSet Read(byte[] NALData)
{
BitStreamReader bitReader = new BitStreamReader(NALData);
SeqParameterSet sps = new SeqParameterSet();
sps.profile_idc = bitReader.ReadNBit(8);
sps.constraint_set_0_flag = bitReader.ReadBool();
sps.constraint_set_1_flag = bitReader.ReadBool();
sps.constraint_set_2_flag = bitReader.ReadBool();
sps.constraint_set_3_flag = bitReader.ReadBool();
bitReader.ReadNBit(4); //reserved_zero_4bits
sps.level_idc = bitReader.ReadNBit(8);
sps.seq_parameter_set_id = bitReader.ReadUE();
sps.chroma_format_idc = ChromaFormat.Yuv420;
if (sps.profile_idc == 100 || sps.profile_idc == 110 || sps.profile_idc == 122 || sps.profile_idc == 244 || sps.profile_idc == 44)
{
sps.chroma_format_idc = (ChromaFormat)bitReader.ReadUE();
if (sps.chroma_format_idc == ChromaFormat.Yuv444)
{
sps.residual_color_transform_flag = bitReader.ReadBool();
}
sps.bit_depth_luma_minus8 = bitReader.ReadUE();
sps.bit_depth_chroma_minus8 = bitReader.ReadUE();
sps.qpprime_y_zero_transform_bypass_flag = bitReader.ReadBool();
bool seqScalingMatrixPresent = bitReader.ReadBool();
if (seqScalingMatrixPresent)
{
ReadScalingListMatrix(bitReader, ref sps.scalingMatrix);
}
}
sps.log2_max_frame_num_minus4 = bitReader.ReadUE();
sps.pic_order_cnt_type = bitReader.ReadUE();
if (sps.pic_order_cnt_type == 0)
{
sps.log2_max_pic_order_cnt_lsb_minus4 = bitReader.ReadUE();
}
else if (sps.pic_order_cnt_type == 1)
{
sps.delta_pic_order_always_zero_flag = bitReader.ReadBool();
sps.offset_for_non_ref_pic = bitReader.ReadSE();
sps.offset_for_top_to_bottom_field = bitReader.ReadSE();
sps.num_ref_frames_in_pic_order_cnt_cycle = bitReader.ReadUE();
sps.offsetForRefFrame = new int[sps.num_ref_frames_in_pic_order_cnt_cycle];
for (int i = 0; i < sps.num_ref_frames_in_pic_order_cnt_cycle; i++)
{
sps.offsetForRefFrame[i] = bitReader.ReadSE();
}
}
sps.num_ref_frames = bitReader.ReadUE();
sps.gaps_in_frame_num_value_allowed_flag = bitReader.ReadBool();
sps.pic_width_in_mbs_minus1 = bitReader.ReadUE();
sps.pic_height_in_map_units_minus1 = bitReader.ReadUE();
sps.frame_mbs_only_flag = bitReader.ReadBool();
if (!sps.frame_mbs_only_flag)
{
sps.mb_adaptive_frame_field_flag = bitReader.ReadBool();
}
sps.direct_8x8_inference_flag = bitReader.ReadBool();
sps.frame_cropping_flag = bitReader.ReadBool();
if (sps.frame_cropping_flag)
{
sps.frame_crop_left_offset = bitReader.ReadUE();
sps.frame_crop_right_offset = bitReader.ReadUE();
sps.frame_crop_top_offset = bitReader.ReadUE();
sps.frame_crop_bottom_offset = bitReader.ReadUE();
}
bool vui_parameters_present_flag = bitReader.ReadBool();
if (vui_parameters_present_flag)
{
ReadVUIParameters(bitReader, ref sps.vuiParams);
}
return(sps);
}
