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codecparsers: h265: Fix tile row and column parsing

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Section 6.5.1:  Coding tree block raster and tile scanning conversion process
Follow the equations 6-3 and 6-4

This will provide correct offset_max in slice_header for parsing
num_entry_point_offsets.

https://bugzilla.gnome.org/show_bug.cgi?id=754024

Signed-off-by: Sreerenj Balachandran <sreerenj.balachandran@intel.com>
This commit is contained in:
XuGuangxin 2015-08-24 07:46:27 +03:00 committed by Sebastian Dröge
parent 22456ce032
commit 54c2620bdb
2 changed files with 43 additions and 18 deletions
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58
gst-libs/gst/codecparsers/gsth265parser.c
View file

@ -1795,6 +1795,7 @@ gst_h265_parse_pps (GstH265Parser * parser, GstH265NalUnit * nalu,
GstH265SPS *sps;
gint sps_id;
gint qp_bd_offset;
guint32 CtbSizeY, MinCbLog2SizeY, CtbLog2SizeY;
guint8 i;
INITIALIZE_DEBUG_CATEGORY;
@ -1815,6 +1816,14 @@ gst_h265_parse_pps (GstH265Parser * parser, GstH265NalUnit * nalu,
pps->sps = sps;
qp_bd_offset = 6 * sps->bit_depth_luma_minus8;
MinCbLog2SizeY = sps->log2_min_luma_coding_block_size_minus3 + 3;
CtbLog2SizeY = MinCbLog2SizeY + sps->log2_diff_max_min_luma_coding_block_size;
CtbSizeY = 1 << CtbLog2SizeY;
pps->PicHeightInCtbsY =
ceil ((gdouble) sps->pic_height_in_luma_samples / (gdouble) CtbSizeY);
pps->PicWidthInCtbsY =
ceil ((gdouble) sps->pic_width_in_luma_samples / (gdouble) CtbSizeY);
/* set default values for fields that might not be present in the bitstream
and have valid defaults */
pps->diff_cu_qp_delta_depth = 0;
@ -1860,12 +1869,36 @@ gst_h265_parse_pps (GstH265Parser * parser, GstH265NalUnit * nalu,
READ_UE_ALLOWED (&nr, pps->num_tile_rows_minus1, 0, 21);
READ_UINT8 (&nr, pps->uniform_spacing_flag, 1);
if (!pps->uniform_spacing_flag) {
for (i = 0; i < pps->num_tile_columns_minus1; i++)
/* 6.5.1, 6-4, 6-5, 7.4.3.3.1 */
if (pps->uniform_spacing_flag) {
guint8 num_col = pps->num_tile_columns_minus1 + 1;
guint8 num_row = pps->num_tile_rows_minus1 + 1;
for (i = 0; i < num_col; i++) {
pps->column_width_minus1[i] =
((i + 1) * pps->PicWidthInCtbsY / num_col
- i * pps->PicWidthInCtbsY / num_col) - 1;
}
for (i = 0; i < num_row; i++) {
pps->row_height_minus1[i] =
((i + 1) * pps->PicHeightInCtbsY / num_row
- i * pps->PicHeightInCtbsY / num_row) - 1;
}
} else {
pps->column_width_minus1[pps->num_tile_columns_minus1] =
pps->PicWidthInCtbsY - 1;
for (i = 0; i < pps->num_tile_columns_minus1; i++) {
READ_UE (&nr, pps->column_width_minus1[i]);
pps->column_width_minus1[pps->num_tile_columns_minus1] -=
(pps->column_width_minus1[i] + 1);
}
for (i = 0; i < pps->num_tile_rows_minus1; i++)
pps->row_height_minus1[pps->num_tile_rows_minus1] =
pps->PicHeightInCtbsY - 1;
for (i = 0; i < pps->num_tile_rows_minus1; i++) {
READ_UE (&nr, pps->row_height_minus1[i]);
pps->row_height_minus1[pps->num_tile_rows_minus1] -=
(pps->row_height_minus1[i] + 1);
}
}
READ_UINT8 (&nr, pps->loop_filter_across_tiles_enabled_flag, 1);
}
@ -1956,11 +1989,6 @@ gst_h265_parser_parse_slice_hdr (GstH265Parser * parser,
GstH265ShortTermRefPicSet *stRPS = NULL;
guint32 UsedByCurrPicLt[16];
guint32 PicSizeInCtbsY;
guint32 PicWidthInCtbsY;
guint32 PicHeightInCtbsY;
guint32 CtbSizeY;
guint32 MinCbLog2SizeY;
guint32 CtbLog2SizeY;
gint NumPocTotalCurr = 0;
if (!nalu->size) {
@ -1996,14 +2024,7 @@ gst_h265_parser_parse_slice_hdr (GstH265Parser * parser,
return GST_H265_PARSER_BROKEN_LINK;
}
MinCbLog2SizeY = sps->log2_min_luma_coding_block_size_minus3 + 3;
CtbLog2SizeY = MinCbLog2SizeY + sps->log2_diff_max_min_luma_coding_block_size;
CtbSizeY = 1 << CtbLog2SizeY;
PicHeightInCtbsY =
ceil ((gdouble) sps->pic_height_in_luma_samples / (gdouble) CtbSizeY);
PicWidthInCtbsY =
ceil ((gdouble) sps->pic_width_in_luma_samples / (gdouble) CtbSizeY);
PicSizeInCtbsY = PicWidthInCtbsY * PicHeightInCtbsY;
PicSizeInCtbsY = pps->PicWidthInCtbsY * pps->PicHeightInCtbsY;
/* set default values for fields that might not be present in the bitstream
* and have valid defaults */
slice->dependent_slice_segment_flag = 0;
@ -2211,13 +2232,14 @@ gst_h265_parser_parse_slice_hdr (GstH265Parser * parser,
guint32 offset_max;
if (!pps->tiles_enabled_flag && pps->entropy_coding_sync_enabled_flag)
offset_max = PicHeightInCtbsY - 1;
offset_max = pps->PicHeightInCtbsY - 1;
else if (pps->tiles_enabled_flag && !pps->entropy_coding_sync_enabled_flag)
offset_max =
(pps->num_tile_columns_minus1 + 1) * (pps->num_tile_rows_minus1 + 1) -
1;
else
offset_max = (pps->num_tile_columns_minus1 + 1) * PicHeightInCtbsY - 1;
offset_max =
(pps->num_tile_columns_minus1 + 1) * pps->PicHeightInCtbsY - 1;
READ_UE_MAX (&nr, slice->num_entry_point_offsets, offset_max);
if (slice->num_entry_point_offsets > 0) {

3
gst-libs/gst/codecparsers/gsth265parser.h
View file

@ -827,6 +827,9 @@ struct _GstH265PPS
guint8 pps_extension_flag;
/* calculated values */
guint32 PicWidthInCtbsY;
guint32 PicHeightInCtbsY;
gboolean valid;
};