void ParseScalingList(H264Bitstream r, int sizeOfScalingList)
{
var lastScale = 8;
var nextScale = 8;
for (var j = 0; j < sizeOfScalingList; ++j)
{
if (0 != nextScale)
{
var delta_scale = r.ReadSe();
nextScale = (lastScale + delta_scale + 256) & 0xff;
var useDefaultScalingMatrixFlag = (0 == j && 0 == nextScale);
}
var scalingList = 0 == nextScale ? lastScale : nextScale;
lastScale = scalingList;
}
}
void ReadScalingList(H264Bitstream r, int sizeOfScalingList)
{
var lastScale = 8;
var nextScale = 8;
for (var j = 0; j < sizeOfScalingList; j++)
{
if (nextScale != 0)
{
var delta_scale = r.ReadSe();
nextScale = (lastScale + delta_scale + 256) % 256;
var useDefaultScalingMatrixFlag = (j == 0 && nextScale == 0);
}
var scalingList_j = (nextScale == 0) ? lastScale : nextScale;
lastScale = scalingList_j;
}
}
public void ReadSps(H264Bitstream r)
{
_ppsSeqParameterSetId = null;
uint profile_idc;
uint constraint_sets;
uint level_idc;
uint width;
uint height;
var forbidden_zero_bit = r.ReadBits(1);
var nal_ref_idc = r.ReadBits(2);
var nal_unit_type = r.ReadBits(5);
profile_idc = r.ReadBits(8);
constraint_sets = r.ReadBits(8);
level_idc = r.ReadBits(8);
var seq_parameter_set_id = r.ReadUe();
_seqParameterSetId = seq_parameter_set_id;
if (Array.BinarySearch(ProfileIdcHasChromaFormat, profile_idc) >= 0)
{
var chroma_format_idc = r.ReadUe();
_chromaFormatIdc = chroma_format_idc;
if (3 == chroma_format_idc)
{
var separate_colour_plane_flag = r.ReadBits(1);
_separateColourPlaneFlag = separate_colour_plane_flag;
}
var bit_depth_luma_minus8 = r.ReadUe();
var bit_depth_chroma_minus8 = r.ReadUe();
var qpprime_y_zero_transform_bypass_flag = r.ReadBits(1);
var seq_scaling_matrix_present_flag = r.ReadBits(1);
if (0 != seq_scaling_matrix_present_flag)
{
for (var i = 0; i < (3 != chroma_format_idc ? 8 : 12); ++i)
{
var seq_scaling_list_present_flag = r.ReadBits(1);
if (0 != seq_scaling_list_present_flag)
ParseScalingList(r, i < 6 ? 16 : 64);
}
}
}
var log2_max_frame_num_minus4 = r.ReadUe();
_log2MaxFrameNumMinus4 = log2_max_frame_num_minus4;
var pic_order_cnt_type = r.ReadUe();
_picOrderCntType = pic_order_cnt_type;
if (0 == pic_order_cnt_type)
{
var log2_max_pic_order_cnt_lsb_minus4 = r.ReadUe();
}
else if (1 == pic_order_cnt_type)
{
var delta_pic_order_always_zero_flag = r.ReadBits(1);
_deltaPicOrderAlwaysZeroFlag = delta_pic_order_always_zero_flag;
var offset_for_non_ref_pic = r.ReadSe();
var offset_for_top_to_bottom_field = r.ReadSe();
var num_ref_frames_in_pic_order_cnt_cycle = r.ReadUe();
for (var i = 0; i < num_ref_frames_in_pic_order_cnt_cycle; ++i)
{
var offset_for_ref_frame = r.ReadSe();
}
}
var max_num_ref_frames = r.ReadUe();
var gaps_in_frame_num_value_allowed_flag = r.ReadBits(1);
var pic_width_in_mbs_minus1 = r.ReadUe();
var pic_height_in_map_units_minus1 = r.ReadUe();
var frame_mbs_only_flag = r.ReadBits(1);
_frameMbsOnlyFlag = frame_mbs_only_flag;
if (0 == frame_mbs_only_flag)
{
var mb_adaptive_frame_field_flag = r.ReadBits(1);
}
var direct_8x8_inference_flag = r.ReadBits(1);
var frame_cropping_flag = r.ReadBits(1);
width = ((pic_width_in_mbs_minus1 + 1) * 16);
height = ((2 - frame_mbs_only_flag) * (pic_height_in_map_units_minus1 + 1) * 16);
if (0 != frame_cropping_flag)
{
var frame_crop_left_offset = r.ReadUe();
var frame_crop_right_offset = r.ReadUe();
var frame_crop_top_offset = r.ReadUe();
var frame_crop_bottom_offset = r.ReadUe();
width = width - frame_crop_left_offset * 2 - frame_crop_right_offset * 2;
height = height - (frame_crop_top_offset * 2) - (frame_crop_bottom_offset * 2);
}
var vui_parameters_present_flag = r.ReadBits(1);
if (0 != vui_parameters_present_flag)
{
ReadVuiParameters(r);
}
Height = (int)height;
Width = (int)width;
var profileName = ProfileName(profile_idc, constraint_sets);
Name = String.Format("H.264 \"{0}\" profile, level {1} {2}x{3}",
profileName, level_idc / 10.0, width, height);
}
public void ReadPps(H264Bitstream r)
{
_slicePicParameterSetId = null;
var forbidden_zero_bit = r.ReadBits(1);
var nal_ref_idc = r.ReadBits(2);
var nal_unit_type = r.ReadBits(5);
var pic_parameter_set_id = r.ReadUe();
_picParameterSetId = pic_parameter_set_id;
var seq_parameter_set_id = r.ReadUe();
_ppsSeqParameterSetId = seq_parameter_set_id;
var entropy_coding_mode_flag = r.ReadBits(1);
var bottom_field_pic_order_in_frame_present_flag = r.ReadBits(1);
_bottomFieldPicOrderInFramePresentFlag = bottom_field_pic_order_in_frame_present_flag;
var num_slice_groups_minus1 = r.ReadUe();
if (num_slice_groups_minus1 > 0)
{
var slice_group_map_type = r.ReadUe();
if (0 == slice_group_map_type)
{
for (var iGroup = 0; iGroup <= num_slice_groups_minus1; iGroup++)
{
var run_length_minus1_iGroup = r.ReadUe();
}
}
else if (2 == slice_group_map_type)
{
for (var iGroup = 0; iGroup < num_slice_groups_minus1; iGroup++)
{
var top_left_iGroup = r.ReadUe();
var bottom_right_iGroup = r.ReadUe();
}
}
else if (3 == slice_group_map_type || 4 == slice_group_map_type || 5 == slice_group_map_type)
{
var slice_group_change_direction_flag = r.ReadBits(1);
var slice_group_change_rate_minus1 = r.ReadUe();
}
else if (6 == slice_group_map_type)
{
var nsgBits = GetBitSize(num_slice_groups_minus1);
var pic_size_in_map_units_minus1 = r.ReadUe();
for (var i = 0; i <= pic_size_in_map_units_minus1; i++)
{
var slice_group_id_i = r.ReadBits(nsgBits);
}
}
}
var num_ref_idx_l0_default_active_minus1 = r.ReadUe();
var num_ref_idx_l1_default_active_minus1 = r.ReadUe();
var weighted_pred_flag = r.ReadBits(1);
var weighted_bipred_idc = r.ReadBits(2);
var pic_init_qp_minus26 /* relative to 26 */ = r.ReadSe();
var pic_init_qs_minus26 /* relative to 26 */ = r.ReadSe();
var chroma_qp_index_offset = r.ReadSe();
var deblocking_filter_control_present_flag = r.ReadBits(1);
var constrained_intra_pred_flag = r.ReadBits(1);
var redundant_pic_cnt_present_flag = r.ReadBits(1);
_redundantPicCntPresentFlag = redundant_pic_cnt_present_flag;
if (more_rbsp_data(r))
{
var transform_8x8_mode_flag = r.ReadBits(1);
var pic_scaling_matrix_present_flag = r.ReadBits(1);
if (0 != pic_scaling_matrix_present_flag)
{
for (var i = 0; i < 6 + ((_chromaFormatIdc != 3) ? 2 : 6) * transform_8x8_mode_flag; i++)
{
var pic_scaling_list_present_flag_i = r.ReadBits(1);
if (0 != pic_scaling_list_present_flag_i)
{
if (i < 6)
{
ReadScalingList(r, 16);
//scaling_list(ScalingList4x4[i], 16, UseDefaultScalingMatrix4x4Flag[i]);
}
else
{
ReadScalingList(r, 64);
//scaling_list(ScalingList8x8[i - 6], 64, UseDefaultScalingMatrix8x8Flag[i - 6]);
}
}
}
}
var second_chroma_qp_index_offset = r.ReadSe();
}
}
public void ReadSliceHeader(H264Bitstream r, bool IdrPicFlag)
{
var first_mb_in_slice = r.ReadUe();
var slice_type = r.ReadUe();
var pic_parameter_set_id = r.ReadUe();
_slicePicParameterSetId = pic_parameter_set_id;
if (_separateColourPlaneFlag == 1)
{
var colour_plane_id = r.ReadBits(2);
}
var frame_num = r.ReadBits((int)(_log2MaxFrameNumMinus4 ?? 0) + 4);
uint field_pic_flag = 0;
if (0 == _frameMbsOnlyFlag)
{
field_pic_flag = r.ReadBits(1);
if (0 != field_pic_flag)
{
var bottom_field_flag = r.ReadBits(1);
}
}
_fieldPicFlag = 0 != field_pic_flag;
if (IdrPicFlag)
{
var idr_pic_id = r.ReadUe();
if (_picOrderCntType == 0)
{
var pic_order_cnt_lsb = r.ReadBits((int)(_log2MaxFrameNumMinus4 ?? 0) + 4);
if (0 != _bottomFieldPicOrderInFramePresentFlag && 0 == field_pic_flag)
{
var delta_pic_order_cnt_bottom = r.ReadSe();
}
}
if (_picOrderCntType == 1 && 0 == _deltaPicOrderAlwaysZeroFlag)
{
var delta_pic_order_cnt_0 = r.ReadSe();
if (0 != _bottomFieldPicOrderInFramePresentFlag && 0 == field_pic_flag)
{
var delta_pic_order_cnt_1 = r.ReadSe();
}
}
if (0 != _redundantPicCntPresentFlag)
{
var redundant_pic_cnt = r.ReadUe();
}
}
}
