From 54c2620bdb256022cdd11dd6639ca91cb982ffe2 Mon Sep 17 00:00:00 2001 From: XuGuangxin Date: Mon, 24 Aug 2015 07:46:27 +0300 Subject: [PATCH] codecparsers: h265: Fix tile row and column parsing 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 --- gst-libs/gst/codecparsers/gsth265parser.c | 58 +++++++++++++++++++++---------- gst-libs/gst/codecparsers/gsth265parser.h | 3 ++ 2 files changed, 43 insertions(+), 18 deletions(-) diff --git a/gst-libs/gst/codecparsers/gsth265parser.c b/gst-libs/gst/codecparsers/gsth265parser.c index 5a5f157..9bbcecb 100644 --- a/gst-libs/gst/codecparsers/gsth265parser.c +++ b/gst-libs/gst/codecparsers/gsth265parser.c @@ -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) { diff --git a/gst-libs/gst/codecparsers/gsth265parser.h b/gst-libs/gst/codecparsers/gsth265parser.h index c9cce69..80cc270 100644 --- a/gst-libs/gst/codecparsers/gsth265parser.h +++ b/gst-libs/gst/codecparsers/gsth265parser.h @@ -827,6 +827,9 @@ struct _GstH265PPS guint8 pps_extension_flag; + /* calculated values */ + guint32 PicWidthInCtbsY; + guint32 PicHeightInCtbsY; gboolean valid; }; -- 2.7.4