public static ScalingList Read(BitStreamReader bitReader, int sizeOfScalingList)
{
ScalingList sl = new ScalingList();
sl.scalingList = new int[sizeOfScalingList];
int lastScale = 8;
int nextScale = 8;
for (int j = 0; j < sizeOfScalingList; j++)
{
if (nextScale != 0)
{
int deltaScale = bitReader.ReadSE();
nextScale = (lastScale + deltaScale + 256) % 256;
sl.useDefaultScalingMatrixFlag = (j == 0 && nextScale == 0);
}
sl.scalingList[j] = nextScale == 0 ? lastScale : nextScale;
lastScale = sl.scalingList[j];
}
return(sl);
}
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);
}
