[FFmpeg-devel] [PATCH v6 01/11] avcodec: add enum types for H266/VVC

[Thomas Siedel <thomas.ff@spin-digital.com>]

From: Nuo Mi <nuomi2021@gmail.com>

Add types as nal unit types, slice types and vvc typedefs needed
for parsing vvc high-level syntax.
---
 libavcodec/h266.h | 142 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 142 insertions(+)
 create mode 100644 libavcodec/h266.h

diff --git a/libavcodec/h266.h b/libavcodec/h266.h
new file mode 100644
index 0000000000..697592cf50
--- /dev/null
+++ b/libavcodec/h266.h
@@ -0,0 +1,142 @@
+/*
+ * H.266 / VVC shared code
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_H266_H
+#define AVCODEC_H266_H
+
+/**
+ * Table 5 – NAL unit type codes and NAL unit type classes
+ * in T-REC-H.266-202008
+ */
+enum VVCNALUnitType {
+    VVC_TRAIL_NUT      = 0,
+    VVC_STSA_NUT       = 1,
+    VVC_RADL_NUT       = 2,
+    VVC_RASL_NUT       = 3,
+    VVC_RSV_VCL_4      = 4,
+    VVC_RSV_VCL_5      = 5,
+    VVC_RSV_VCL_6      = 6,
+    VVC_IDR_W_RADL     = 7,
+    VVC_IDR_N_LP       = 8,
+    VVC_CRA_NUT        = 9,
+    VVC_GDR_NUT        = 10,
+    VVC_RSV_IRAP_11    = 11,
+    VVC_OPI_NUT        = 12,
+    VVC_DCI_NUT        = 13,
+    VVC_VPS_NUT        = 14,
+    VVC_SPS_NUT        = 15,
+    VVC_PPS_NUT        = 16,
+    VVC_PREFIX_APS_NUT = 17,
+    VVC_SUFFIX_APS_NUT = 18,
+    VVC_PH_NUT         = 19,
+    VVC_AUD_NUT        = 20,
+    VVC_EOS_NUT        = 21,
+    VVC_EOB_NUT        = 22,
+    VVC_PREFIX_SEI_NUT = 23,
+    VVC_SUFFIX_SEI_NUT = 24,
+    VVC_FD_NUT         = 25,
+    VVC_RSV_NVCL_26    = 26,
+    VVC_RSV_NVCL_27    = 27,
+    VVC_UNSPEC_28      = 28,
+    VVC_UNSPEC_29      = 29,
+    VVC_UNSPEC_30      = 30,
+    VVC_UNSPEC_31      = 31,
+};
+
+enum VVCSliceType {
+    VVC_SLICE_TYPE_B = 0,
+    VVC_SLICE_TYPE_P = 1,
+    VVC_SLICE_TYPE_I = 2,
+};
+
+enum {
+    //6.2 we can have 3 sample arrays
+    VVC_MAX_SAMPLE_ARRAYS = 3,
+
+    //7.4.3.3 vps_max_layers_minus1 is u(6)
+    VVC_MAX_LAYERS = 64,
+
+    //7.4.3.3 The value of vps_max_sublayers_minus1 shall be in the range of 0 to 6, inclusive
+    VVC_MAX_SUBLAYERS = 7,
+
+    //7.4.3.3 vps_num_ptls_minus1 is u(8)
+    VVC_MAX_PTLS = 256,
+
+    //7.4.3.3 vps_num_output_layer_sets_minus2 is u(8)
+    VVC_MAX_TOTAL_NUM_OLSS = 257,
+
+    // 7.3.2.3: vps_video_parameter_set_id is u(4).
+    VVC_MAX_VPS_COUNT = 16,
+    // 7.3.2.4: sps_seq_parameter_set_id is u(4)
+    VVC_MAX_SPS_COUNT = 16,
+    // 7.3.2.5: pps_pic_parameter_set_id is u(6)
+    VVC_MAX_PPS_COUNT = 64,
+
+    // 7.4.4.1: ptl_num_sub_profiles is u(8)
+    VVC_MAX_SUB_PROFILES = 256,
+
+    // A.4.2: according to (1577), MaxDpbSize is bounded above by 2 * maxDpbPicBuf(8)
+    VVC_MAX_DPB_SIZE = 16,
+
+    //7.4.3.4 sps_num_ref_pic_lists in range [0, 64]
+    VVC_MAX_REF_PIC_LISTS = 64,
+
+    //7.4.11 num_ref_entries in range [0, MaxDpbSize + 13]
+    VVC_MAX_REF_ENTRIES = VVC_MAX_DPB_SIZE + 13,
+
+    //7.4.3.3 sps_num_points_in_qp_table_minus1[i] in range [0, 36 − sps_qp_table_start_minus26[i]],
+    //sps_qp_table_start_minus26[i] in range [sps_qp_table_start_minus26[i] −26 − QpBdOffset, 36]
+    //for 10 bitsQpBdOffset is 12, so sps_num_points_in_qp_table_minus1[i] in range [0, 74]
+    VVC_MAX_POINTS_IN_QP_TABLE = 75,
+
+    // 7.4.6.1: hrd_cpb_cnt_minus1 is in [0, 31].
+    VVC_MAX_CPB_CNT = 32,
+
+    // A.4.1: the highest level allows a MaxLumaPs of 35 651 584.
+    VVC_MAX_LUMA_PS = 35651584,
+
+    // A.4.1: pic_width_in_luma_samples and pic_height_in_luma_samples are
+    // constrained to be not greater than sqrt(MaxLumaPs * 8).  Hence height/
+    // width are bounded above by sqrt(8 * 35651584) = 16888.2 samples.
+    VVC_MAX_WIDTH  = 16888,
+    VVC_MAX_HEIGHT = 16888,
+
+    // A.4.1: table A.1 allows at most 440 tiles per au for any level.
+    VVC_MAX_TILES_PER_AU = 440,
+    // A.4.1: table A.1 did not define max tile rows.
+    // in worest a case, we can have 1x440 tiles picture.
+    VVC_MAX_TILE_ROWS    = VVC_MAX_TILES_PER_AU,
+    // A.4.1: table A.1 allows at most 20 tile columns for any level.
+    VVC_MAX_TILE_COLUMNS = 20,
+
+    // A.4.1 table A.1 allows at most 600 slice for any level.
+    VVC_MAX_SLICES = 600,
+
+    // 7.4.8: in the worst case (!pps_no_pic_partition_flag and
+    // sps_entropy_coding_sync_enabled_flag are both true), entry points can be
+    // placed at the beginning of every Ctb row in every tile, giving an
+    // upper bound of (num_tile_columns_minus1 + 1) * PicHeightInCtbsY - 1.
+    // Only a stream with very high resolution and perverse parameters could
+    // get near that, though, so set a lower limit here with the maximum
+    // possible value for 8K video (at most 135 32x32 Ctb rows).
+    VVC_MAX_ENTRY_POINTS = VVC_MAX_TILE_COLUMNS * 135,
+};
+
+#endif /* AVCODEC_H266_H */
-- 
2.25.1

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