@@ -1146,6 +1146,7 @@ OBJS-$(CONFIG_DVAUDIO_PARSER) += dvaudio_parser.o
OBJS-$(CONFIG_DVBSUB_PARSER) += dvbsub_parser.o
OBJS-$(CONFIG_DVD_NAV_PARSER) += dvd_nav_parser.o
OBJS-$(CONFIG_DVDSUB_PARSER) += dvdsub_parser.o
+OBJS-$(CONFIG_EVC_PARSER) += evc_parser.o
OBJS-$(CONFIG_FLAC_PARSER) += flac_parser.o flacdata.o flac.o
OBJS-$(CONFIG_FTR_PARSER) += ftr_parser.o
OBJS-$(CONFIG_G723_1_PARSER) += g723_1_parser.o
new file mode 100644
@@ -0,0 +1,155 @@
+/*
+ * EVC definitions and enums
+ * Copyright (c) 2022 Dawid Kozinski <d.kozinski@samsung.com>
+ *
+ * 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_EVC_H
+#define AVCODEC_EVC_H
+
+// The length field that indicates the length in bytes of the following NAL unit is configured to be of 4 bytes
+#define EVC_NALU_LENGTH_PREFIX_SIZE (4) /* byte */
+#define EVC_NALU_HEADER_SIZE (2) /* byte */
+
+/**
+ * @see ISO_IEC_23094-1_2020, 7.4.2.2 NAL unit header semantic
+ * Table 4 - NAL unit type codes and NAL unit type classes
+ */
+enum EVCNALUnitType {
+ EVC_NOIDR_NUT = 0, /* Coded slice of a non-IDR picture */
+ EVC_IDR_NUT = 1, /* Coded slice of an IDR picture */
+ EVC_RSV_VCL_NUT02 = 2,
+ EVC_RSV_VCL_NUT03 = 3,
+ EVC_RSV_VCL_NUT04 = 4,
+ EVC_RSV_VCL_NUT05 = 5,
+ EVC_RSV_VCL_NUT06 = 6,
+ EVC_RSV_VCL_NUT07 = 7,
+ EVC_RSV_VCL_NUT08 = 8,
+ EVC_RSV_VCL_NUT09 = 9,
+ EVC_RSV_VCL_NUT10 = 10,
+ EVC_RSV_VCL_NUT11 = 11,
+ EVC_RSV_VCL_NUT12 = 12,
+ EVC_RSV_VCL_NUT13 = 13,
+ EVC_RSV_VCL_NUT14 = 14,
+ EVC_RSV_VCL_NUT15 = 15,
+ EVC_RSV_VCL_NUT16 = 16,
+ EVC_RSV_VCL_NUT17 = 17,
+ EVC_RSV_VCL_NUT18 = 18,
+ EVC_RSV_VCL_NUT19 = 19,
+ EVC_RSV_VCL_NUT20 = 20,
+ EVC_RSV_VCL_NUT21 = 21,
+ EVC_RSV_VCL_NUT22 = 22,
+ EVC_RSV_VCL_NUT23 = 23,
+ EVC_SPS_NUT = 24, /* Sequence parameter set */
+ EVC_PPS_NUT = 25, /* Picture paremeter set */
+ EVC_APS_NUT = 26, /* Adaptation parameter set */
+ EVC_FD_NUT = 27, /* Filler data */
+ EVC_SEI_NUT = 28, /* Supplemental enhancement information */
+ EVC_RSV_NONVCL29 = 29,
+ EVC_RSV_NONVCL30 = 30,
+ EVC_RSV_NONVCL31 = 31,
+ EVC_RSV_NONVCL32 = 32,
+ EVC_RSV_NONVCL33 = 33,
+ EVC_RSV_NONVCL34 = 34,
+ EVC_RSV_NONVCL35 = 35,
+ EVC_RSV_NONVCL36 = 36,
+ EVC_RSV_NONVCL37 = 37,
+ EVC_RSV_NONVCL38 = 38,
+ EVC_RSV_NONVCL39 = 39,
+ EVC_RSV_NONVCL40 = 40,
+ EVC_RSV_NONVCL41 = 41,
+ EVC_RSV_NONVCL42 = 42,
+ EVC_RSV_NONVCL43 = 43,
+ EVC_RSV_NONVCL44 = 44,
+ EVC_RSV_NONVCL45 = 45,
+ EVC_RSV_NONVCL46 = 46,
+ EVC_RSV_NONVCL47 = 47,
+ EVC_RSV_NONVCL48 = 48,
+ EVC_RSV_NONVCL49 = 49,
+ EVC_RSV_NONVCL50 = 50,
+ EVC_RSV_NONVCL51 = 51,
+ EVC_RSV_NONVCL52 = 52,
+ EVC_RSV_NONVCL53 = 53,
+ EVC_RSV_NONVCL54 = 54,
+ EVC_RSV_NONVCL55 = 55,
+ EVC_UNSPEC_NUT56 = 56,
+ EVC_UNSPEC_NUT57 = 57,
+ EVC_UNSPEC_NUT58 = 58,
+ EVC_UNSPEC_NUT59 = 59,
+ EVC_UNSPEC_NUT60 = 60,
+ EVC_UNSPEC_NUT61 = 61,
+ EVC_UNSPEC_NUT62 = 62
+};
+
+// slice type
+// @see ISO_IEC_23094-1_2020 7.4.5 Slice header semantics
+//
+enum EVCSliceType {
+ EVC_SLICE_TYPE_B = 0,
+ EVC_SLICE_TYPE_P = 1,
+ EVC_SLICE_TYPE_I = 2
+};
+
+enum {
+ // 7.4.3.2: aps_video_parameter_set_id is u(4).
+ EVC_MAX_APS_COUNT = 32,
+
+ // 7.4.3.1: sps_seq_parameter_set_id is in [0, 15].
+ EVC_MAX_SPS_COUNT = 16,
+
+ // 7.4.3.2: pps_pic_parameter_set_id is in [0, 63].
+ EVC_MAX_PPS_COUNT = 64,
+
+ // 7.4.5: slice header slice_pic_parameter_set_id in [0, 63]
+ EVC_MAX_SH_COUNT = 64,
+
+ // E.3.2: cpb_cnt_minus1[i] is in [0, 31].
+ EVC_MAX_CPB_CNT = 32,
+
+ // A.4.1: in table A.1 the highest level allows a MaxLumaPs of 35 651 584.
+ EVC_MAX_LUMA_PS = 35651584,
+
+ EVC_MAX_NUM_REF_PICS = 21,
+
+ EVC_MAX_NUM_RPLS = 32,
+
+ // 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.
+ EVC_MAX_WIDTH = 16888,
+ EVC_MAX_HEIGHT = 16888,
+
+ // A.4.1: table A.1 allows at most 22 tile rows for any level.
+ EVC_MAX_TILE_ROWS = 22,
+ // A.4.1: table A.1 allows at most 20 tile columns for any level.
+ EVC_MAX_TILE_COLUMNS = 20,
+
+ // A.4.1: table A.1 allows at most 600 slice segments for any level.
+ EVC_MAX_SLICE_SEGMENTS = 600,
+
+ // 7.4.7.1: in the worst case (tiles_enabled_flag and
+ // entropy_coding_sync_enabled_flag are both set), 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 4K video (at most 135 16x16 Ctb rows).
+ HEVC_MAX_ENTRY_POINT_OFFSETS = EVC_MAX_TILE_COLUMNS * 135,
+};
+
+#endif // AVCODEC_EVC_H
new file mode 100644
@@ -0,0 +1,1417 @@
+/*
+ * EVC format parser
+ *
+ * Copyright (C) 2021 Dawid Kozinski <d.kozinski@samsung.com>
+ *
+ * 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
+ */
+
+#include <stdint.h>
+
+#include "libavutil/common.h"
+#include "parser.h"
+#include "golomb.h"
+#include "evc.h"
+
+#define EVC_MAX_QP_TABLE_SIZE 58
+
+#define EXTENDED_SAR 255
+#define NUM_CPB 32
+
+// rpl structure
+typedef struct RefPicListStruct {
+ int poc;
+ int tid;
+ int ref_pic_num;
+ int ref_pic_active_num;
+ int ref_pics[EVC_MAX_NUM_REF_PICS];
+ char pic_type;
+
+} RefPicListStruct;
+
+// chromaQP table structure to be signalled in SPS
+typedef struct ChromaQpTable
+{
+ int chroma_qp_table_present_flag; // u(1)
+ int same_qp_table_for_chroma; // u(1)
+ int global_offset_flag; // u(1)
+ int num_points_in_qp_table_minus1[2]; // ue(v)
+ int delta_qp_in_val_minus1[2][EVC_MAX_QP_TABLE_SIZE]; // u(6)
+ int delta_qp_out_val[2][EVC_MAX_QP_TABLE_SIZE]; // se(v)
+} ChromaQpTable;
+
+// Hypothetical Reference Decoder (HRD) parameters, part of VUI
+typedef struct HRDParameters
+{
+ int cpb_cnt_minus1; // ue(v)
+ int bit_rate_scale; // u(4)
+ int cpb_size_scale; // u(4)
+ int bit_rate_value_minus1[NUM_CPB]; // ue(v)
+ int cpb_size_value_minus1[NUM_CPB]; // ue(v)
+ int cbr_flag[NUM_CPB]; // u(1)
+ int initial_cpb_removal_delay_length_minus1; // u(5)
+ int cpb_removal_delay_length_minus1; // u(5)
+ int dpb_output_delay_length_minus1; // u(5)
+ int time_offset_length; // u(5)
+} HRDParameters;
+
+// video usability information (VUI) part of SPS
+typedef struct VUIParameters
+{
+ int aspect_ratio_info_present_flag; // u(1)
+ int aspect_ratio_idc; // u(8)
+ int sar_width; // u(16)
+ int sar_height; // u(16)
+ int overscan_info_present_flag; // u(1)
+ int overscan_appropriate_flag; // u(1)
+ int video_signal_type_present_flag; // u(1)
+ int video_format; // u(3)
+ int video_full_range_flag; // u(1)
+ int colour_description_present_flag; // u(1)
+ int colour_primaries; // u(8)
+ int transfer_characteristics; // u(8)
+ int matrix_coefficients; // u(8)
+ int chroma_loc_info_present_flag; // u(1)
+ int chroma_sample_loc_type_top_field; // ue(v)
+ int chroma_sample_loc_type_bottom_field; // ue(v)
+ int neutral_chroma_indication_flag; // u(1)
+ int field_seq_flag; // u(1)
+ int timing_info_present_flag; // u(1)
+ int num_units_in_tick; // u(32)
+ int time_scale; // u(32)
+ int fixed_pic_rate_flag; // u(1)
+ int nal_hrd_parameters_present_flag; // u(1)
+ int vcl_hrd_parameters_present_flag; // u(1)
+ int low_delay_hrd_flag; // u(1)
+ int pic_struct_present_flag; // u(1)
+ int bitstream_restriction_flag; // u(1)
+ int motion_vectors_over_pic_boundaries_flag; // u(1)
+ int max_bytes_per_pic_denom; // ue(v)
+ int max_bits_per_mb_denom; // ue(v)
+ int log2_max_mv_length_horizontal; // ue(v)
+ int log2_max_mv_length_vertical; // ue(v)
+ int num_reorder_pics; // ue(v)
+ int max_dec_pic_buffering; // ue(v)
+
+ HRDParameters hrd_parameters;
+} VUIParameters;
+
+// The sturcture reflects SPS RBSP(raw byte sequence payload) layout
+// @see ISO_IEC_23094-1 section 7.3.2.1
+//
+// The following descriptors specify the parsing process of each element
+// u(n) - unsigned integer using n bits
+// ue(v) - unsigned integer 0-th order Exp_Golomb-coded syntax element with the left bit first
+typedef struct EVCParserSPS {
+ int sps_seq_parameter_set_id; // ue(v)
+ int profile_idc; // u(8)
+ int level_idc; // u(8)
+ int toolset_idc_h; // u(32)
+ int toolset_idc_l; // u(32)
+ int chroma_format_idc; // ue(v)
+ int pic_width_in_luma_samples; // ue(v)
+ int pic_height_in_luma_samples; // ue(v)
+ int bit_depth_luma_minus8; // ue(v)
+ int bit_depth_chroma_minus8; // ue(v)
+
+ int sps_btt_flag; // u(1)
+ int log2_ctu_size_minus5; // ue(v)
+ int log2_min_cb_size_minus2; // ue(v)
+ int log2_diff_ctu_max_14_cb_size; // ue(v)
+ int log2_diff_ctu_max_tt_cb_size; // ue(v)
+ int log2_diff_min_cb_min_tt_cb_size_minus2; // ue(v)
+
+ int sps_suco_flag; // u(1)
+ int log2_diff_ctu_size_max_suco_cb_size; // ue(v)
+ int log2_diff_max_suco_min_suco_cb_size; // ue(v)
+
+ int sps_admvp_flag; // u(1)
+ int sps_affine_flag; // u(1)
+ int sps_amvr_flag; // u(1)
+ int sps_dmvr_flag; // u(1)
+ int sps_mmvd_flag; // u(1)
+ int sps_hmvp_flag; // u(1)
+
+ int sps_eipd_flag; // u(1)
+ int sps_ibc_flag; // u(1)
+ int log2_max_ibc_cand_size_minus2; // ue(v)
+
+ int sps_cm_init_flag; // u(1)
+ int sps_adcc_flag; // u(1)
+
+ int sps_iqt_flag; // u(1)
+ int sps_ats_flag; // u(1)
+
+ int sps_addb_flag; // u(1)
+ int sps_alf_flag; // u(1)
+ int sps_htdf_flag; // u(1)
+ int sps_rpl_flag; // u(1)
+ int sps_pocs_flag; // u(1)
+ int sps_dquant_flag; // u(1)
+ int sps_dra_flag; // u(1)
+
+ int log2_max_pic_order_cnt_lsb_minus4; // ue(v)
+ int log2_sub_gop_length; // ue(v)
+ int log2_ref_pic_gap_length; // ue(v)
+
+ int max_num_tid0_ref_pics; // ue(v)
+
+ int sps_max_dec_pic_buffering_minus1; // ue(v)
+ int long_term_ref_pic_flag; // u(1)
+ int rpl1_same_as_rpl0_flag; // u(1)
+ int num_ref_pic_list_in_sps[2]; // ue(v)
+ struct RefPicListStruct rpls[2][EVC_MAX_NUM_RPLS];
+
+ int picture_cropping_flag; // u(1)
+ int picture_crop_left_offset; // ue(v)
+ int picture_crop_right_offset; // ue(v)
+ int picture_crop_top_offset; // ue(v)
+ int picture_crop_bottom_offset; // ue(v)
+
+ struct ChromaQpTable chroma_qp_table_struct;
+
+ int vui_parameters_present_flag; // u(1)
+
+ struct VUIParameters vui_parameters;
+
+} EVCParserSPS;
+
+typedef struct EVCParserPPS {
+ int pps_pic_parameter_set_id; // ue(v)
+ int pps_seq_parameter_set_id; // ue(v)
+ int num_ref_idx_default_active_minus1[2]; // ue(v)
+ int additional_lt_poc_lsb_len; // ue(v)
+ int rpl1_idx_present_flag; // u(1)
+ int single_tile_in_pic_flag; // u(1)
+ int num_tile_columns_minus1; // ue(v)
+ int num_tile_rows_minus1; // ue(v)
+ int uniform_tile_spacing_flag; // u(1)
+ int tile_column_width_minus1[EVC_MAX_TILE_ROWS]; // ue(v)
+ int tile_row_height_minus1[EVC_MAX_TILE_COLUMNS]; // ue(v)
+ int loop_filter_across_tiles_enabled_flag; // u(1)
+ int tile_offset_len_minus1; // ue(v)
+ int tile_id_len_minus1; // ue(v)
+ int explicit_tile_id_flag; // u(1)
+ int tile_id_val[EVC_MAX_TILE_ROWS][EVC_MAX_TILE_COLUMNS]; // u(v)
+ int pic_dra_enabled_flag; // u(1)
+ int pic_dra_aps_id; // u(5)
+ int arbitrary_slice_present_flag; // u(1)
+ int constrained_intra_pred_flag; // u(1)
+ int cu_qp_delta_enabled_flag; // u(1)
+ int log2_cu_qp_delta_area_minus6; // ue(v)
+
+} EVCParserPPS;
+
+// The sturcture reflects Slice Header RBSP(raw byte sequence payload) layout
+// @see ISO_IEC_23094-1 section 7.3.2.6
+//
+// The following descriptors specify the parsing process of each element
+// u(n) - unsigned integer using n bits
+// ue(v) - unsigned integer 0-th order Exp_Golomb-coded syntax element with the left bit first
+// u(n) - unsigned integer using n bits.
+// When n is "v" in the syntax table, the number of bits varies in a manner dependent on the value of other syntax elements.
+typedef struct EVCParserSliceHeader {
+ int slice_pic_parameter_set_id; // ue(v)
+ int single_tile_in_slice_flag; // u(1)
+ int first_tile_id; // u(v)
+ int arbitrary_slice_flag; // u(1)
+ int last_tile_id; // u(v)
+ int num_remaining_tiles_in_slice_minus1; // ue(v)
+ int delta_tile_id_minus1[EVC_MAX_TILE_ROWS * EVC_MAX_TILE_COLUMNS]; // ue(v)
+
+ int slice_type; // ue(v)
+ int no_output_of_prior_pics_flag; // u(1)
+ int mmvd_group_enable_flag; // u(1)
+ int slice_alf_enabled_flag; // u(1)
+
+ int slice_alf_luma_aps_id; // u(5)
+ int slice_alf_map_flag; // u(1)
+ int slice_alf_chroma_idc; // u(2)
+ int slice_alf_chroma_aps_id; // u(5)
+ int slice_alf_chroma_map_flag; // u(1)
+ int slice_alf_chroma2_aps_id; // u(5)
+ int slice_alf_chroma2_map_flag; // u(1)
+ int slice_pic_order_cnt_lsb; // u(v)
+
+ // @note
+ // Currently the structure does not reflect the entire Slice Header RBSP layout.
+ // It contains only the fields that are necessary to read from the NAL unit all the values
+ // necessary for the correct initialization of the AVCodecContext structure.
+
+ // @note
+ // If necessary, add the missing fields to the structure to reflect
+ // the contents of the entire NAL unit of the SPS type
+
+} EVCParserSliceHeader;
+
+// picture order count of the current picture
+typedef struct EVCParserPoc {
+ int PicOrderCntVal; // current picture order count value
+ int prevPicOrderCntVal; // the picture order count of the previous Tid0 picture
+ int DocOffset; // the decoding order count of the previous picture
+} EVCParserPoc;
+
+typedef struct EVCParserContext {
+ ParseContext pc;
+ EVCParserSPS sps[EVC_MAX_SPS_COUNT];
+ EVCParserPPS pps[EVC_MAX_PPS_COUNT];
+ EVCParserSliceHeader slice_header[EVC_MAX_PPS_COUNT];
+
+ int to_read; // number of bytes of NAL Unit that do not fit into the current input data chunk and must be read from the new chunk(s)
+ int bytes_read; // number of bytes of the current Access Unit that already has been read
+
+ int incomplete_nalu_prefix_read; // the flag is set to 1 when the current input data chunk contains an incomplete NAL unit prefix
+ int incomplete_nalu_read; // the flag is set to 1 when the current input data chunk contains an incomplete NAL unit (more input data is needed to read complete NAL unit)
+
+ int nuh_temporal_id; // the value of TemporalId (shall be the same for all VCL NAL units of an Access Unit)
+
+ int nalu_prefix_assembled; // the flag is set to when NALU prefix has been assembled from last chunk and current chunk of incoming data
+ int nalu_type; // the current NALU type
+ int nalu_size; // the current NALU size
+ int time_base;
+
+ EVCParserPoc poc;
+
+ int parsed_extradata;
+
+} EVCParserContext;
+
+static int get_nalu_type(const uint8_t *bits, int bits_size, AVCodecContext *avctx)
+{
+ int unit_type_plus1 = 0;
+
+ if (bits_size >= EVC_NALU_HEADER_SIZE) {
+ unsigned char *p = (unsigned char *)bits;
+ // forbidden_zero_bit
+ if ((p[0] & 0x80) != 0)
+ return -1;
+
+ // nal_unit_type
+ unit_type_plus1 = (p[0] >> 1) & 0x3F;
+ }
+
+ return unit_type_plus1 - 1;
+}
+
+static uint32_t read_nal_unit_length(const uint8_t *bits, int bits_size, AVCodecContext *avctx)
+{
+ uint32_t nalu_len = 0;
+
+ if (bits_size >= EVC_NALU_LENGTH_PREFIX_SIZE) {
+
+ int t = 0;
+ unsigned char *p = (unsigned char *)bits;
+
+ for (int i = 0; i < EVC_NALU_LENGTH_PREFIX_SIZE; i++)
+ t = (t << 8) | p[i];
+
+ nalu_len = t;
+ if (nalu_len == 0)
+ return 0;
+ }
+
+ return nalu_len;
+}
+
+// nuh_temporal_id specifies a temporal identifier for the NAL unit
+static int get_temporal_id(const uint8_t *bits, int bits_size, AVCodecContext *avctx)
+{
+ int temporal_id = 0;
+ short t = 0;
+
+ if (bits_size >= EVC_NALU_HEADER_SIZE) {
+ unsigned char *p = (unsigned char *)bits;
+ // forbidden_zero_bit
+ if ((p[0] & 0x80) != 0)
+ return -1;
+
+ for (int i = 0; i < EVC_NALU_HEADER_SIZE; i++)
+ t = (t << 8) | p[i];
+
+ temporal_id = (t >> 6) & 0x0007;
+ }
+
+ return temporal_id;
+}
+
+// @see ISO_IEC_23094-1 (7.3.7 Reference picture list structure syntax)
+static int ref_pic_list_struct(GetBitContext* gb, RefPicListStruct* rpl)
+{
+ uint32_t delta_poc_st, strp_entry_sign_flag = 0;
+ rpl->ref_pic_num = get_ue_golomb(gb);
+ if (rpl->ref_pic_num > 0)
+ {
+ delta_poc_st = get_ue_golomb(gb);
+
+ rpl->ref_pics[0] = delta_poc_st;
+ if (rpl->ref_pics[0] != 0)
+ {
+ strp_entry_sign_flag = get_bits(gb, 1);
+
+ rpl->ref_pics[0] *= 1 - (strp_entry_sign_flag << 1);
+ }
+ }
+
+ for (int i = 1; i < rpl->ref_pic_num; ++i)
+ {
+ delta_poc_st = get_ue_golomb(gb);
+ if (delta_poc_st != 0) {
+ strp_entry_sign_flag = get_bits(gb, 1);
+ }
+ rpl->ref_pics[i] = rpl->ref_pics[i - 1] + delta_poc_st * (1 - (strp_entry_sign_flag << 1));
+ }
+
+ return 0;
+}
+
+// @see ISO_IEC_23094-1 (E.2.2 HRD parameters syntax)
+static int hrd_parameters(GetBitContext* gb, HRDParameters* hrd) {
+ hrd->cpb_cnt_minus1 = get_ue_golomb(gb);
+ hrd->bit_rate_scale = get_bits(gb, 4);
+ hrd->cpb_size_scale = get_bits(gb, 4);
+ for (int SchedSelIdx = 0; SchedSelIdx <= hrd->cpb_cnt_minus1; SchedSelIdx++)
+ {
+ hrd->bit_rate_value_minus1[SchedSelIdx] = get_ue_golomb(gb);
+ hrd->cpb_size_value_minus1[SchedSelIdx] = get_ue_golomb(gb);
+ hrd->cbr_flag[SchedSelIdx] = get_bits(gb, 1);
+ }
+ hrd->initial_cpb_removal_delay_length_minus1 = get_bits(gb, 5);
+ hrd->cpb_removal_delay_length_minus1 = get_bits(gb, 5);
+ hrd->cpb_removal_delay_length_minus1 = get_bits(gb, 5);
+ hrd->time_offset_length = get_bits(gb, 5);
+
+ return 0;
+}
+
+// @see ISO_IEC_23094-1 (E.2.1 VUI parameters syntax)
+static int vui_parameters(GetBitContext* gb, VUIParameters* vui) {
+ vui->aspect_ratio_info_present_flag = get_bits(gb, 1);
+ if (vui->aspect_ratio_info_present_flag)
+ {
+ vui->aspect_ratio_idc = get_bits(gb, 8);
+ if (vui->aspect_ratio_idc == EXTENDED_SAR)
+ {
+ vui->sar_width = get_bits(gb, 16);
+ vui->sar_height = get_bits(gb, 16);
+ }
+ }
+ vui->overscan_info_present_flag = get_bits(gb, 1);
+ if (vui->overscan_info_present_flag)
+ {
+ vui->overscan_appropriate_flag = get_bits(gb, 1);
+ }
+ vui->video_signal_type_present_flag = get_bits(gb, 1);
+ if (vui->video_signal_type_present_flag)
+ {
+ vui->video_format = get_bits(gb, 3);
+ vui->video_full_range_flag = get_bits(gb, 1);
+ vui->colour_description_present_flag = get_bits(gb, 1);
+ if (vui->colour_description_present_flag)
+ {
+ vui->colour_primaries = get_bits(gb, 8);
+ vui->transfer_characteristics = get_bits(gb, 8);
+ vui->matrix_coefficients = get_bits(gb, 8);
+ }
+ }
+ vui->chroma_loc_info_present_flag = get_bits(gb, 1);
+ if (vui->chroma_loc_info_present_flag)
+ {
+ vui->chroma_sample_loc_type_top_field = get_ue_golomb(gb);
+ vui->chroma_sample_loc_type_bottom_field = get_ue_golomb(gb);
+ }
+ vui->neutral_chroma_indication_flag = get_bits(gb, 1);
+
+ vui->field_seq_flag = get_bits(gb, 1);
+
+ vui->timing_info_present_flag = get_bits(gb, 1);
+ if (vui->timing_info_present_flag)
+ {
+ vui->num_units_in_tick = get_bits(gb, 32);
+ vui->time_scale = get_bits(gb, 32);
+ vui->fixed_pic_rate_flag = get_bits(gb, 1);
+ }
+ vui->nal_hrd_parameters_present_flag = get_bits(gb, 1);
+ if (vui->nal_hrd_parameters_present_flag)
+ {
+ hrd_parameters(gb, &vui->hrd_parameters);
+ }
+ vui->vcl_hrd_parameters_present_flag = get_bits(gb, 1);
+ if (vui->vcl_hrd_parameters_present_flag)
+ {
+ hrd_parameters(gb, &vui->hrd_parameters);
+ }
+ if (vui->nal_hrd_parameters_present_flag || vui->vcl_hrd_parameters_present_flag)
+ {
+ vui->low_delay_hrd_flag = get_bits(gb, 1);
+ }
+ vui->pic_struct_present_flag = get_bits(gb, 1);
+ vui->bitstream_restriction_flag = get_bits(gb, 1);
+ if (vui->bitstream_restriction_flag) {
+ vui->motion_vectors_over_pic_boundaries_flag = get_bits(gb, 1);
+ vui->max_bytes_per_pic_denom = get_ue_golomb(gb);
+ vui->max_bits_per_mb_denom = get_ue_golomb(gb);
+ vui->log2_max_mv_length_horizontal = get_ue_golomb(gb);
+ vui->log2_max_mv_length_vertical = get_ue_golomb(gb);
+ vui->num_reorder_pics = get_ue_golomb(gb);
+ vui->max_dec_pic_buffering = get_ue_golomb(gb);
+ }
+
+ return 0;
+}
+
+// @see ISO_IEC_23094-1 (7.3.2.1 SPS RBSP syntax)
+static EVCParserSPS *parse_sps(const uint8_t *bs, int bs_size, EVCParserContext *ev)
+{
+ GetBitContext gb;
+ EVCParserSPS *sps;
+ int sps_seq_parameter_set_id;
+
+ if (init_get_bits8(&gb, bs, bs_size) < 0)
+ return NULL;
+
+ sps_seq_parameter_set_id = get_ue_golomb(&gb);
+
+ if (sps_seq_parameter_set_id >= EVC_MAX_SPS_COUNT)
+ return NULL;
+
+ sps = &ev->sps[sps_seq_parameter_set_id];
+ sps->sps_seq_parameter_set_id = sps_seq_parameter_set_id;
+
+ // the Baseline profile is indicated by profile_idc eqal to 0
+ // the Main profile is indicated by profile_idc eqal to 1
+ sps->profile_idc = get_bits(&gb, 8);
+
+ sps->level_idc = get_bits(&gb, 8);
+
+ skip_bits_long(&gb, 32); /* skip toolset_idc_h */
+ skip_bits_long(&gb, 32); /* skip toolset_idc_l */
+
+ // 0 - monochrome
+ // 1 - 4:2:0
+ // 2 - 4:2:2
+ // 3 - 4:4:4
+ sps->chroma_format_idc = get_ue_golomb(&gb);
+
+ sps->pic_width_in_luma_samples = get_ue_golomb(&gb);
+ sps->pic_height_in_luma_samples = get_ue_golomb(&gb);
+
+ sps->bit_depth_luma_minus8 = get_ue_golomb(&gb);
+ sps->bit_depth_chroma_minus8 = get_ue_golomb(&gb);
+
+ sps->sps_btt_flag = get_bits(&gb, 1);
+ if (sps->sps_btt_flag) {
+ sps->log2_ctu_size_minus5 = get_ue_golomb(&gb);
+ sps->log2_min_cb_size_minus2 = get_ue_golomb(&gb);
+ sps->log2_diff_ctu_max_14_cb_size = get_ue_golomb(&gb);
+ sps->log2_diff_ctu_max_tt_cb_size = get_ue_golomb(&gb);
+ sps->log2_diff_min_cb_min_tt_cb_size_minus2 = get_ue_golomb(&gb);
+ }
+
+ sps->sps_suco_flag = get_bits(&gb, 1);
+ if (sps->sps_suco_flag) {
+ sps->log2_diff_ctu_size_max_suco_cb_size = get_ue_golomb(&gb);
+ sps->log2_diff_max_suco_min_suco_cb_size = get_ue_golomb(&gb);
+ }
+
+ sps->sps_admvp_flag = get_bits(&gb, 1);
+ if (sps->sps_admvp_flag) {
+ sps->sps_affine_flag = get_bits(&gb, 1);
+ sps->sps_amvr_flag = get_bits(&gb, 1);
+ sps->sps_dmvr_flag = get_bits(&gb, 1);
+ sps->sps_mmvd_flag = get_bits(&gb, 1);
+ sps->sps_hmvp_flag = get_bits(&gb, 1);
+ }
+
+ sps->sps_eipd_flag = get_bits(&gb, 1);
+ if (sps->sps_eipd_flag) {
+ sps->sps_ibc_flag = get_bits(&gb, 1);
+ if (sps->sps_ibc_flag)
+ sps->log2_max_ibc_cand_size_minus2 = get_ue_golomb(&gb);
+ }
+
+ sps->sps_cm_init_flag = get_bits(&gb, 1);
+ if (sps->sps_cm_init_flag)
+ sps->sps_adcc_flag = get_bits(&gb, 1);
+
+ sps->sps_iqt_flag = get_bits(&gb, 1);
+ if (sps->sps_iqt_flag)
+ sps->sps_ats_flag = get_bits(&gb, 1);
+
+ sps->sps_addb_flag = get_bits(&gb, 1);
+ sps->sps_alf_flag = get_bits(&gb, 1);
+ sps->sps_htdf_flag = get_bits(&gb, 1);
+ sps->sps_rpl_flag = get_bits(&gb, 1);
+ sps->sps_pocs_flag = get_bits(&gb, 1);
+ sps->sps_dquant_flag = get_bits(&gb, 1);
+ sps->sps_dra_flag = get_bits(&gb, 1);
+
+ if (sps->sps_pocs_flag)
+ sps->log2_max_pic_order_cnt_lsb_minus4 = get_ue_golomb(&gb);
+
+ if (!sps->sps_pocs_flag || !sps->sps_rpl_flag) {
+ sps->log2_sub_gop_length = get_ue_golomb(&gb);
+ if (sps->log2_sub_gop_length == 0)
+ sps->log2_ref_pic_gap_length = get_ue_golomb(&gb);
+ }
+
+ if (!sps->sps_rpl_flag) {
+ sps->max_num_tid0_ref_pics = get_ue_golomb(&gb);
+ } else {
+ sps->sps_max_dec_pic_buffering_minus1 = get_ue_golomb(&gb);
+ sps->long_term_ref_pic_flag = get_bits(&gb, 1);
+ sps->rpl1_same_as_rpl0_flag = get_bits(&gb, 1);
+ sps->num_ref_pic_list_in_sps[0] = get_ue_golomb(&gb);
+
+ for (int i = 0; i < sps->num_ref_pic_list_in_sps[0]; ++i)
+ ref_pic_list_struct(&gb, &sps->rpls[0][i]);
+
+ if (!sps->rpl1_same_as_rpl0_flag)
+ {
+ sps->num_ref_pic_list_in_sps[1] = get_ue_golomb(&gb);
+ for (int i = 0; i < sps->num_ref_pic_list_in_sps[1]; ++i)
+ ref_pic_list_struct(&gb, &sps->rpls[1][i]);
+ }
+ }
+
+ sps->picture_cropping_flag = get_bits(&gb, 1);
+
+ if (sps->picture_cropping_flag) {
+ sps->picture_crop_left_offset = get_ue_golomb(&gb);
+ sps->picture_crop_right_offset = get_ue_golomb(&gb);
+ sps->picture_crop_top_offset = get_ue_golomb(&gb);
+ sps->picture_crop_bottom_offset = get_ue_golomb(&gb);
+ }
+
+ if (sps->chroma_format_idc != 0)
+ {
+ sps->chroma_qp_table_struct.chroma_qp_table_present_flag = get_bits(&gb, 1);
+
+ if (sps->chroma_qp_table_struct.chroma_qp_table_present_flag)
+ {
+ sps->chroma_qp_table_struct.same_qp_table_for_chroma = get_bits(&gb, 1);
+ sps->chroma_qp_table_struct.global_offset_flag = get_bits(&gb, 1);
+ for (int i = 0; i < (sps->chroma_qp_table_struct.same_qp_table_for_chroma ? 1 : 2); i++)
+ {
+ sps->chroma_qp_table_struct.num_points_in_qp_table_minus1[i] = get_ue_golomb(&gb);;
+ for (int j = 0; j <= sps->chroma_qp_table_struct.num_points_in_qp_table_minus1[i]; j++)
+ {
+ sps->chroma_qp_table_struct.delta_qp_in_val_minus1[i][j] = get_bits(&gb, 6);
+ sps->chroma_qp_table_struct.delta_qp_out_val[i][j] = get_se_golomb(&gb);
+ }
+ }
+ }
+ }
+
+ sps->vui_parameters_present_flag = get_bits(&gb, 1);
+ if (sps->vui_parameters_present_flag)
+ vui_parameters(&gb, &(sps->vui_parameters));
+
+ // @note
+ // If necessary, add the missing fields to the EVCParserSPS structure
+ // and then extend parser implementation
+
+ return sps;
+}
+
+// @see ISO_IEC_23094-1 (7.3.2.2 SPS RBSP syntax)
+//
+// @note
+// The current implementation of parse_sps function doesn't handle VUI parameters parsing.
+// If it will be needed, parse_sps function could be extended to handle VUI parameters parsing
+// to initialize fields of the AVCodecContex i.e. color_primaries, color_trc,color_range
+//
+static EVCParserPPS *parse_pps(const uint8_t *bs, int bs_size, EVCParserContext *ev)
+{
+ GetBitContext gb;
+ EVCParserPPS *pps;
+
+ int pps_pic_parameter_set_id;
+
+ if (init_get_bits8(&gb, bs, bs_size) < 0)
+ return NULL;
+
+ pps_pic_parameter_set_id = get_ue_golomb(&gb);
+ if (pps_pic_parameter_set_id > EVC_MAX_PPS_COUNT)
+ return NULL;
+
+ pps = &ev->pps[pps_pic_parameter_set_id];
+
+ pps->pps_pic_parameter_set_id = pps_pic_parameter_set_id;
+
+ pps->pps_seq_parameter_set_id = get_ue_golomb(&gb);
+ if (pps->pps_seq_parameter_set_id >= EVC_MAX_SPS_COUNT)
+ return NULL;
+
+ pps->num_ref_idx_default_active_minus1[0] = get_ue_golomb(&gb);
+ pps->num_ref_idx_default_active_minus1[1] = get_ue_golomb(&gb);
+ pps->additional_lt_poc_lsb_len = get_ue_golomb(&gb);
+ pps->rpl1_idx_present_flag = get_bits(&gb, 1);
+ pps->single_tile_in_pic_flag = get_bits(&gb, 1);
+
+ if (!pps->single_tile_in_pic_flag) {
+ pps->num_tile_columns_minus1 = get_ue_golomb(&gb);
+ pps->num_tile_rows_minus1 = get_ue_golomb(&gb);
+ pps->uniform_tile_spacing_flag = get_bits(&gb, 1);
+
+ if (!pps->uniform_tile_spacing_flag) {
+ for (int i = 0; i < pps->num_tile_columns_minus1; i++)
+ pps->tile_column_width_minus1[i] = get_ue_golomb(&gb);
+
+ for (int i = 0; i < pps->num_tile_rows_minus1; i++)
+ pps->tile_row_height_minus1[i] = get_ue_golomb(&gb);
+ }
+ pps->loop_filter_across_tiles_enabled_flag = get_bits(&gb, 1);
+ pps->tile_offset_len_minus1 = get_ue_golomb(&gb);
+ }
+
+ pps->tile_id_len_minus1 = get_ue_golomb(&gb);
+ pps->explicit_tile_id_flag = get_bits(&gb, 1);
+
+ if (pps->explicit_tile_id_flag) {
+ for (int i = 0; i <= pps->num_tile_rows_minus1; i++) {
+ for (int j = 0; j <= pps->num_tile_columns_minus1; j++)
+ pps->tile_id_val[i][j] = get_bits(&gb, pps->tile_id_len_minus1 + 1);
+ }
+ }
+
+ pps->pic_dra_enabled_flag = 0;
+ pps->pic_dra_enabled_flag = get_bits(&gb, 1);
+
+ if (pps->pic_dra_enabled_flag)
+ pps->pic_dra_aps_id = get_bits(&gb, 5);
+
+ pps->arbitrary_slice_present_flag = get_bits(&gb, 1);
+ pps->constrained_intra_pred_flag = get_bits(&gb, 1);
+ pps->cu_qp_delta_enabled_flag = get_bits(&gb, 1);
+
+ if (pps->cu_qp_delta_enabled_flag)
+ pps->log2_cu_qp_delta_area_minus6 = get_ue_golomb(&gb);
+
+ return pps;
+}
+
+// @see ISO_IEC_23094-1 (7.3.2.6 Slice layer RBSP syntax)
+static EVCParserSliceHeader *parse_slice_header(const uint8_t *bs, int bs_size, EVCParserContext *ev)
+{
+ GetBitContext gb;
+ EVCParserSliceHeader *sh;
+ EVCParserPPS *pps;
+ EVCParserSPS *sps;
+
+ int num_tiles_in_slice = 0;
+ int slice_pic_parameter_set_id;
+
+ if (init_get_bits8(&gb, bs, bs_size) < 0)
+ return NULL;
+
+ slice_pic_parameter_set_id = get_ue_golomb(&gb);
+
+ if (slice_pic_parameter_set_id < 0 || slice_pic_parameter_set_id >= EVC_MAX_PPS_COUNT)
+ return NULL;
+
+ sh = &ev->slice_header[slice_pic_parameter_set_id];
+ pps = &ev->pps[slice_pic_parameter_set_id];
+ sps = &ev->sps[slice_pic_parameter_set_id];
+
+ sh->slice_pic_parameter_set_id = slice_pic_parameter_set_id;
+
+ if (!pps->single_tile_in_pic_flag) {
+ sh->single_tile_in_slice_flag = get_bits(&gb, 1);
+ sh->first_tile_id = get_bits(&gb, pps->tile_id_len_minus1 + 1);
+ } else
+ sh->single_tile_in_slice_flag = 1;
+
+ if (!sh->single_tile_in_slice_flag) {
+ if (pps->arbitrary_slice_present_flag)
+ sh->arbitrary_slice_flag = get_bits(&gb, 1);
+
+ if (!sh->arbitrary_slice_flag)
+ sh->last_tile_id = get_bits(&gb, pps->tile_id_len_minus1 + 1);
+ else {
+ sh->num_remaining_tiles_in_slice_minus1 = get_ue_golomb(&gb);
+ num_tiles_in_slice = sh->num_remaining_tiles_in_slice_minus1 + 2;
+ for (int i = 0; i < num_tiles_in_slice - 1; ++i)
+ sh->delta_tile_id_minus1[i] = get_ue_golomb(&gb);
+ }
+ }
+
+ sh->slice_type = get_ue_golomb(&gb);
+
+ if (ev->nalu_type == EVC_IDR_NUT)
+ sh->no_output_of_prior_pics_flag = get_bits(&gb, 1);
+
+ if (sps->sps_mmvd_flag && ((sh->slice_type == EVC_SLICE_TYPE_B) || (sh->slice_type == EVC_SLICE_TYPE_P)))
+ sh->mmvd_group_enable_flag = get_bits(&gb, 1);
+ else
+ sh->mmvd_group_enable_flag = 0;
+
+ if (sps->sps_alf_flag) {
+ int ChromaArrayType = sps->chroma_format_idc;
+
+ sh->slice_alf_enabled_flag = get_bits(&gb, 1);
+
+ if (sh->slice_alf_enabled_flag) {
+ sh->slice_alf_luma_aps_id = get_bits(&gb, 5);
+ sh->slice_alf_map_flag = get_bits(&gb, 1);
+ sh->slice_alf_chroma_idc = get_bits(&gb, 2);
+
+ if ((ChromaArrayType == 1 || ChromaArrayType == 2) && sh->slice_alf_chroma_idc > 0)
+ sh->slice_alf_chroma_aps_id = get_bits(&gb, 5);
+ }
+ if (ChromaArrayType == 3) {
+ int sliceChromaAlfEnabledFlag = 0;
+ int sliceChroma2AlfEnabledFlag = 0;
+
+ if (sh->slice_alf_chroma_idc == 1) { // @see ISO_IEC_23094-1 (7.4.5)
+ sliceChromaAlfEnabledFlag = 1;
+ sliceChroma2AlfEnabledFlag = 0;
+ } else if (sh->slice_alf_chroma_idc == 2) {
+ sliceChromaAlfEnabledFlag = 0;
+ sliceChroma2AlfEnabledFlag = 1;
+ } else if (sh->slice_alf_chroma_idc == 3) {
+ sliceChromaAlfEnabledFlag = 1;
+ sliceChroma2AlfEnabledFlag = 1;
+ } else {
+ sliceChromaAlfEnabledFlag = 0;
+ sliceChroma2AlfEnabledFlag = 0;
+ }
+
+ if (!sh->slice_alf_enabled_flag)
+ sh->slice_alf_chroma_idc = get_bits(&gb, 2);
+
+ if (sliceChromaAlfEnabledFlag) {
+ sh->slice_alf_chroma_aps_id = get_bits(&gb, 5);
+ sh->slice_alf_chroma_map_flag = get_bits(&gb, 1);
+ }
+
+ if (sliceChroma2AlfEnabledFlag) {
+ sh->slice_alf_chroma2_aps_id = get_bits(&gb, 5);
+ sh->slice_alf_chroma2_map_flag = get_bits(&gb, 1);
+ }
+ }
+ }
+
+ if (ev->nalu_type != EVC_IDR_NUT) {
+ if (sps->sps_pocs_flag)
+ sh->slice_pic_order_cnt_lsb = get_bits(&gb, sps->log2_max_pic_order_cnt_lsb_minus4 + 4);
+ }
+
+ // @note
+ // If necessary, add the missing fields to the EVCParserSliceHeader structure
+ // and then extend parser implementation
+
+ return sh;
+}
+
+/**
+ *
+ * Parse NAL unit
+ *
+ * @param s parser context
+ * @param buf buffer with field/frame data
+ * @param buf_size size of the buffer
+ * @param avctx codec context
+ */
+static int parse_nal_unit(AVCodecParserContext *s, const uint8_t *buf,
+ int buf_size, AVCodecContext *avctx)
+{
+ EVCParserContext *ev = s->priv_data;
+ int nalu_type, nalu_size;
+ int tid;
+ const uint8_t *data = buf;
+ int data_size = buf_size;
+
+ s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
+ s->key_frame = -1;
+
+
+ nalu_size = buf_size;
+ if (nalu_size <= 0) {
+ av_log(avctx, AV_LOG_ERROR, "Invalid NAL unit size: (%d)\n", nalu_size);
+ return AVERROR_INVALIDDATA;
+ }
+
+ // @see ISO_IEC_23094-1_2020, 7.4.2.2 NAL unit header semantic (Table 4 - NAL unit type codes and NAL unit type classes)
+ // @see enum EVCNALUnitType in evc.h
+ nalu_type = get_nalu_type(data, data_size, avctx);
+ if (nalu_type < EVC_NOIDR_NUT || nalu_type > EVC_UNSPEC_NUT62) {
+ av_log(avctx, AV_LOG_ERROR, "Invalid NAL unit type: (%d)\n", nalu_type);
+ return AVERROR_INVALIDDATA;
+ }
+ ev->nalu_type = nalu_type;
+
+ tid = get_temporal_id(data, data_size, avctx);
+ if (tid < 0) {
+ av_log(avctx, AV_LOG_ERROR, "Invalid temporial id: (%d)\n", tid);
+ return AVERROR_INVALIDDATA;
+ }
+ ev->nuh_temporal_id = tid;
+
+ if (data_size < nalu_size) {
+ av_log(avctx, AV_LOG_ERROR, "NAL unit does not fit in the data buffer\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ data += EVC_NALU_HEADER_SIZE;
+ data_size -= EVC_NALU_HEADER_SIZE;
+
+ if (nalu_type == EVC_SPS_NUT) {
+ EVCParserSPS *sps;
+ int SubGopLength;
+
+ sps = parse_sps(data, nalu_size, ev);
+ if (!sps) {
+ av_log(avctx, AV_LOG_ERROR, "SPS parsing error\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ s->coded_width = sps->pic_width_in_luma_samples;
+ s->coded_height = sps->pic_height_in_luma_samples;
+ s->width = sps->pic_width_in_luma_samples - sps->picture_crop_left_offset - sps->picture_crop_right_offset;
+ s->height = sps->pic_height_in_luma_samples - sps->picture_crop_top_offset - sps->picture_crop_bottom_offset;
+
+ SubGopLength = (int)pow(2.0, sps->log2_sub_gop_length);
+ avctx->gop_size = SubGopLength;
+
+ avctx->delay = (sps->sps_max_dec_pic_buffering_minus1)?sps->sps_max_dec_pic_buffering_minus1-1:SubGopLength+sps->max_num_tid0_ref_pics-1;
+
+ if (sps->profile_idc == 1) avctx->profile = FF_PROFILE_EVC_MAIN;
+ else avctx->profile = FF_PROFILE_EVC_BASELINE;
+
+ ev->time_base = avctx->time_base.den;
+
+ switch (sps->chroma_format_idc) {
+ case 0: /* YCBCR400_10LE */
+ av_log(avctx, AV_LOG_ERROR, "YCBCR400_10LE: Not supported chroma format\n");
+ s->format = AV_PIX_FMT_GRAY10LE;
+ return -1;
+ case 1: /* YCBCR420_10LE */
+ s->format = AV_PIX_FMT_YUV420P10LE;
+ break;
+ case 2: /* YCBCR422_10LE */
+ av_log(avctx, AV_LOG_ERROR, "YCBCR422_10LE: Not supported chroma format\n");
+ s->format = AV_PIX_FMT_YUV422P10LE;
+ return -1;
+ case 3: /* YCBCR444_10LE */
+ av_log(avctx, AV_LOG_ERROR, "YCBCR444_10LE: Not supported chroma format\n");
+ s->format = AV_PIX_FMT_YUV444P10LE;
+ return -1;
+ default:
+ s->format = AV_PIX_FMT_NONE;
+ av_log(avctx, AV_LOG_ERROR, "Unknown supported chroma format\n");
+ return -1;
+ }
+ } else if (nalu_type == EVC_PPS_NUT) {
+ EVCParserPPS *pps;
+
+ pps = parse_pps(data, nalu_size, ev);
+ if (!pps) {
+ av_log(avctx, AV_LOG_ERROR, "PPS parsing error\n");
+ return AVERROR_INVALIDDATA;
+ }
+ } else if (nalu_type == EVC_SEI_NUT) // Supplemental Enhancement Information
+ return 0;
+ else if (nalu_type == EVC_APS_NUT) // Adaptation parameter set
+ return 0;
+ else if (nalu_type == EVC_FD_NUT) /* Filler data */
+ return 0;
+ else if (nalu_type == EVC_IDR_NUT || nalu_type == EVC_NOIDR_NUT) { // Coded slice of a IDR or non-IDR picture
+ EVCParserSliceHeader *sh;
+ EVCParserSPS *sps;
+ int slice_pic_parameter_set_id;
+
+ sh = parse_slice_header(data, nalu_size, ev);
+ if (!sh) {
+ av_log(avctx, AV_LOG_ERROR, "Slice header parsing error\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ switch (sh->slice_type) {
+ case EVC_SLICE_TYPE_B: {
+ s->pict_type = AV_PICTURE_TYPE_B;
+ break;
+ }
+ case EVC_SLICE_TYPE_P: {
+ s->pict_type = AV_PICTURE_TYPE_P;
+ break;
+ }
+ case EVC_SLICE_TYPE_I: {
+ s->pict_type = AV_PICTURE_TYPE_I;
+ break;
+ }
+ default: {
+ s->pict_type = AV_PICTURE_TYPE_NONE;
+ }
+ }
+
+ s->key_frame = (nalu_type == EVC_IDR_NUT) ? 1 : 0;
+
+ // POC (picture order count of the current picture) derivation
+ // @see ISO/IEC 23094-1:2020(E) 8.3.1 Decoding process for picture order count
+ slice_pic_parameter_set_id = sh->slice_pic_parameter_set_id;
+ sps = &ev->sps[slice_pic_parameter_set_id];
+
+ if (sps->sps_pocs_flag) {
+
+ int PicOrderCntMsb = 0;
+ ev->poc.prevPicOrderCntVal = ev->poc.PicOrderCntVal;
+
+ if (nalu_type == EVC_IDR_NUT)
+ PicOrderCntMsb = 0;
+ else {
+ int MaxPicOrderCntLsb = 1 << (sps->log2_max_pic_order_cnt_lsb_minus4 + 4);
+
+ int prevPicOrderCntLsb = ev->poc.PicOrderCntVal & (MaxPicOrderCntLsb - 1);
+ int prevPicOrderCntMsb = ev->poc.PicOrderCntVal - prevPicOrderCntLsb;
+
+
+ if ((sh->slice_pic_order_cnt_lsb < prevPicOrderCntLsb) &&
+ ((prevPicOrderCntLsb - sh->slice_pic_order_cnt_lsb) >= (MaxPicOrderCntLsb / 2)))
+
+ PicOrderCntMsb = prevPicOrderCntMsb + MaxPicOrderCntLsb;
+
+ else if ((sh->slice_pic_order_cnt_lsb > prevPicOrderCntLsb) &&
+ ((sh->slice_pic_order_cnt_lsb - prevPicOrderCntLsb) > (MaxPicOrderCntLsb / 2)))
+
+ PicOrderCntMsb = prevPicOrderCntMsb - MaxPicOrderCntLsb;
+
+ else
+ PicOrderCntMsb = prevPicOrderCntMsb;
+ }
+ ev->poc.PicOrderCntVal = PicOrderCntMsb + sh->slice_pic_order_cnt_lsb;
+
+ } else {
+ if (nalu_type == EVC_IDR_NUT) {
+ ev->poc.PicOrderCntVal = 0;
+ ev->poc.DocOffset = -1;
+ } else {
+ int SubGopLength = (int)pow(2.0, sps->log2_sub_gop_length);
+ if (tid == 0) {
+ ev->poc.PicOrderCntVal = ev->poc.prevPicOrderCntVal + SubGopLength;
+ ev->poc.DocOffset = 0;
+ ev->poc.prevPicOrderCntVal = ev->poc.PicOrderCntVal;
+ } else {
+ int ExpectedTemporalId;
+ int PocOffset;
+ int prevDocOffset = ev->poc.DocOffset;
+
+ ev->poc.DocOffset = (prevDocOffset + 1) % SubGopLength;
+ if (ev->poc.DocOffset == 0) {
+ ev->poc.prevPicOrderCntVal += SubGopLength;
+ ExpectedTemporalId = 0;
+ } else
+ ExpectedTemporalId = 1 + (int)log2(ev->poc.DocOffset);
+ while (tid != ExpectedTemporalId) {
+ ev->poc.DocOffset = (ev->poc.DocOffset + 1) % SubGopLength;
+ if (ev->poc.DocOffset == 0)
+ ExpectedTemporalId = 0;
+ else
+ ExpectedTemporalId = 1 + (int)log2(ev->poc.DocOffset);
+ }
+ PocOffset = (int)(SubGopLength * ((2.0 * ev->poc.DocOffset + 1) / (int)pow(2.0, tid) - 2));
+ ev->poc.PicOrderCntVal = ev->poc.prevPicOrderCntVal + PocOffset;
+ }
+ }
+ }
+
+ s->output_picture_number = ev->poc.PicOrderCntVal;
+ s->key_frame = (nalu_type == EVC_IDR_NUT) ? 1 : 0;
+
+ return 0;
+ }
+ data += (nalu_size - EVC_NALU_HEADER_SIZE);
+ data_size -= (nalu_size - EVC_NALU_HEADER_SIZE);
+
+ return 0;
+}
+
+/**
+ * @brief Reconstruct NAL Unit from incomplete data
+ *
+ * @param[in] s parser context
+ * @param[in] data pointer to the buffer containg new data for current NALU prefix
+ * @param[in] data_size amount of bytes to read from the input buffer
+ * @param[out] nalu_prefix assembled NALU length
+ * @param[in ] avctx codec context
+ *
+ * Assemble the NALU prefix storing NALU length if it has been split between 2 subsequent buffers (input chunks) incoming to the parser.
+ * This is the case when the buffer size is not enough for the buffer to store the whole NAL unit prefix.
+ * In this case, we have to get part of the prefix from the previous buffer and assemble it with the rest from the current buffer.
+ * Then we'll be able to read NAL unit size.
+ */
+static int evc_assemble_nalu_prefix(AVCodecParserContext *s, const uint8_t *data, int data_size,
+ uint8_t *nalu_prefix, AVCodecContext *avctx)
+{
+ EVCParserContext *ctx = s->priv_data;
+ ParseContext *pc = &ctx->pc;
+
+ // 1. pc->buffer contains previously read bytes of NALU prefix
+ // 2. buf contains the rest of NAL unit prefix bytes
+ //
+ // ~~~~~~~
+ // EXAMPLE
+ // ~~~~~~~
+ //
+ // In the following example we assumed that the number of already read NAL Unit prefix bytes is equal 1
+ //
+ // ----------
+ // pc->buffer -> conatins already read bytes
+ // ----------
+ // __ pc->index == 1
+ // |
+ // V
+ // -------------------------------------------------------
+ // | 0 | 1 | 2 | 3 | 4 | ... | N |
+ // -------------------------------------------------------
+ // | 0x00 | 0xXX | 0xXX | 0xXX | 0xXX | ... | 0xXX |
+ // -------------------------------------------------------
+ // | PREF | | | | | ... | |
+ // -------------------------------------------------------
+ //
+ // ----------
+ // buf -> contains newly read bytes
+ // ----------
+ // -------------------------------------------------------
+ // | 0 | 1 | 2 | 3 | 4 | ... | N |
+ // -------------------------------------------------------
+ // | 0x00 | 0x00 | 0x3C | 0xXX | 0xXX | ... | 0xXX |
+ // -------------------------------------------------------
+ // | PREF | PREF | PREF | | | ... | |
+ // -------------------------------------------------------
+ //
+ // ----------
+ // nalu_prefix
+ // ----------
+ // ---------------------------------
+ // | 0 | 1 | 2 | 3 |
+ // ---------------------------------
+ // | 0x00 | 0x00 | 0x00 | 0x3C |
+ // ---------------------------------
+ // | NALU LENGTH |
+ // ---------------------------------
+ // NAL Unit lenght = 60 (0x0000003C)
+ //
+
+ for (int i = 0; i < EVC_NALU_LENGTH_PREFIX_SIZE; i++) {
+ if (i < pc->index)
+ nalu_prefix[i] = pc->buffer[i];
+ else
+ nalu_prefix[i] = data[i - pc->index];
+ }
+
+ return 0;
+}
+
+/**
+ * @brief Reconstruct NALU from incomplete data
+ * Assemble NALU if it is split between multiple buffers
+ *
+ * This is the case when buffer size is not enough for the buffer to store NAL unit.
+ * In this case, we have to get parts of the NALU from the previous buffers stored in pc->buffer and assemble it with the rest from the current buffer.
+ *
+ * @param[in] s parser context
+ * @param[in] data pointer to the buffer containg new data for current NALU
+ * @param[in] data_size amount of bytes to read from the input buffer
+ * @param[out] nalu pointer to the memory block for storing assembled NALU
+ * @param[in] nalu_size assembled NALU length
+ * @param[in ] avctx codec context
+ */
+static int evc_assemble_nalu(AVCodecParserContext *s, const uint8_t *data, int data_size,
+ uint8_t *nalu, int nalu_size,
+ AVCodecContext *avctx)
+{
+ EVCParserContext *ctx = s->priv_data;
+ ParseContext *pc = &ctx->pc;
+
+ // 1. pc->buffer contains previously read bytes of the current NALU and previous NALUs that belongs to the current Access Unit.
+ //
+ // - prevoiusly read bytes are data that came with the previous incoming data chunks
+ //
+ // - pc->buffer contains bytes of the current NALU that have been already read while processing previous chunks of incoming data
+ // and already read bytes of previous NALUs belonging to the same Access Unit.
+ //
+ // - The ctx->bytes_read is the index of the first element of the current NALU int the pc->buffer.
+ // - The pc->index is the index of the element located right next to the last element of the current NALU in the pc->buffer.
+ // - The elements of pc->buffer located before ctx->bytes_read index contain previously read NALUs of the current Access Unit.
+ //
+ // 2. buf contains the rest of the NAL unit bytestime_base
+ //
+ // - ctx->to_read number of bytes to read from buf (the index of the element right next to the last element to read)
+ //
+ // ~~~~~~~
+ // EXAMPLE
+ // ~~~~~~~
+ //
+ // In the following example we assumed that the number of already read NAL Unit bytes is equal 1024-2
+ //
+ // ----------
+ // pc->buffer -> conatins already read bytes from prevois incoming data chunks
+ // ----------
+ // __ctx->bytes_read == 2 __ pc->index == 1024
+ // | |
+ // V V
+ // -------------------------------------------------------------------------------
+ // | 0 | 1 | 2 | 3 | 4 | 5 | 6 | ... | 1023 | 1024 |
+ // -------------------------------------------------------------------------------
+ // | 0x00 | 0x01 | 0x02 | 0x03 | 0x04 | 0x05 | 0x06 | ... | 0xA0 | 0xA1 |
+ // -------------------------------------------------------------------------------
+ // | | | NALU | NALU | NALU | NALU | NALU | ... | NALU | |
+ // -------------------------------------------------------------------------------
+ //
+ // ----------
+ // buf -> contains newly read bytes
+ // ----------
+ // __ctx->to_read == 3 (index of the element right next to last one)
+ // |
+ // V
+ // -------------------------------------------------------
+ // | 0 | 1 | 2 | 3 | 4 | ... | 1023 |
+ // -------------------------------------------------------
+ // | 0xB0 | 0xB1 | 0xB2 | 0xB3 | 0xB4 | ... | 0xFF |
+ // -------------------------------------------------------
+ // | NALU | NALU | NALU | | | ... | |
+ // -------------------------------------------------------
+ //
+ // ----------
+ // nalu (nalu size 1025)
+ // ----------
+ //
+ // ----------------------------------------------------------------------------
+ // | 0 | 1 | 2 | 3 | 4 | ... | 1021 | 1022 | 1023 | 1024 |
+ // ----------------------------------------------------------------------------
+ // | 0x02 | 0x03 | 0x04 | 0x05 | 0x06 | ... | 0xA0 | 0xB0 | 0xB1 | 0xB3 |
+ // ----------------------------------------------------------------------------
+
+ uint8_t *prev_data = pc->buffer + ctx->bytes_read;
+ int prev_data_size = pc->index - ctx->bytes_read;
+
+ memcpy(nalu, prev_data, prev_data_size);
+ memcpy(nalu + prev_data_size, data, data_size);
+
+ return 0;
+}
+
+static int end_of_access_unit_found(AVCodecParserContext *s, AVCodecContext *avctx)
+{
+ EVCParserContext *ctx = s->priv_data;
+
+ if (avctx->profile == 0) { // BASELINE profile
+ if (ctx->nalu_type == EVC_NOIDR_NUT || ctx->nalu_type == EVC_IDR_NUT)
+ return 1;
+ } else { // MAIN profile
+ EVCParserContext *ev = s->priv_data;
+ if (ctx->nalu_type == EVC_NOIDR_NUT) {
+ if (ev->poc.PicOrderCntVal != ev->poc.prevPicOrderCntVal)
+ return 1;
+ } else if (ctx->nalu_type == EVC_IDR_NUT)
+ return 1;
+ }
+ return 0;
+}
+
+/**
+ * Find the end of the current frame in the bitstream.
+ * The end of frame is the end of Access Unit.
+ *
+ * @param s parser context
+ * @param buf buffer with field/frame data
+ * @param buf_size size of the buffer
+ * @param avctx codex context
+ *
+ * @return the position of the first byte of the next frame, or END_NOT_FOUND
+ */
+static int evc_find_frame_end(AVCodecParserContext *s, const uint8_t *buf,
+ int buf_size, AVCodecContext *avctx)
+{
+ EVCParserContext *ctx = s->priv_data;
+
+ const uint8_t *data = buf;
+ int data_size = buf_size;
+
+ while (data_size > 0) {
+
+ if (ctx->to_read == 0) {
+ // Nothing must be read and appended to the data from previous chunks.
+ // The previous chunk of data provided the complete NALU prefix or provided the complete NALU.
+
+ if (ctx->nalu_prefix_assembled) // NALU prefix has been assembled from previous and current chunks of incoming data
+ ctx->nalu_prefix_assembled = 0;
+ else { // Buffer size is not enough for buffer to store NAL unit 4-bytes prefix (length)
+ if (data_size < EVC_NALU_LENGTH_PREFIX_SIZE) {
+ ctx->to_read = EVC_NALU_LENGTH_PREFIX_SIZE - data_size;
+ ctx->incomplete_nalu_prefix_read = 1;
+ return END_NOT_FOUND;
+ }
+
+ ctx->nalu_size = read_nal_unit_length(data, data_size, avctx);
+ ctx->bytes_read += EVC_NALU_LENGTH_PREFIX_SIZE;
+
+ data += EVC_NALU_LENGTH_PREFIX_SIZE;
+ data_size -= EVC_NALU_LENGTH_PREFIX_SIZE;
+ }
+
+ if (data_size < ctx->nalu_size) {
+
+ ctx->to_read = ctx->nalu_size - data_size;
+ ctx->incomplete_nalu_read = 1;
+ return END_NOT_FOUND;
+ }
+
+ // the entire NALU can be read
+ if (parse_nal_unit(s, data, ctx->nalu_size, avctx) != 0) {
+ av_log(avctx, AV_LOG_ERROR, "Parsing of NAL unit failed\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ data += ctx->nalu_size;
+ data_size -= ctx->nalu_size;
+
+ ctx->bytes_read += ctx->nalu_size;
+
+ if (end_of_access_unit_found(s, avctx)) {
+
+ // parser should return buffer that contains complete AU
+ int read_bytes = ctx->bytes_read;
+ ctx->bytes_read = 0;
+ return read_bytes;
+ }
+
+ // go to the next iteration
+ continue;
+
+ } else {
+ // The previous chunk of input data did not contain the complete valid NALU prefix or did not contain the complete NALU.
+ //
+ // Missing data must be read from the current data chunk and merged with the data from the previous data chunk
+ // to assemble a complete NALU or complete NALU prefix.
+ //
+ // The data from the previous data chunk are stored in pc->buf
+
+ if (ctx->to_read < data_size) {
+
+ if (ctx->incomplete_nalu_prefix_read == 1) {
+
+ uint8_t nalu_prefix[EVC_NALU_LENGTH_PREFIX_SIZE];
+ evc_assemble_nalu_prefix(s, data, data_size, nalu_prefix, avctx);
+
+ ctx->nalu_size = read_nal_unit_length(nalu_prefix, EVC_NALU_LENGTH_PREFIX_SIZE, avctx);
+
+ // update variable storing amout of read bytes for teh current AU
+ ctx->bytes_read += ctx->to_read;
+
+ // update data pointer and data size
+ data += ctx->to_read;
+ data_size -= ctx->to_read;
+
+ // reset variable storing amount of bytes to read from the new data chunk
+ ctx->to_read = 0;
+
+ ctx->incomplete_nalu_prefix_read = 0;
+ ctx->nalu_prefix_assembled = 1;
+
+ continue;
+ }
+ if (ctx->incomplete_nalu_read == 1) {
+
+ uint8_t *nalu = (uint8_t *)av_malloc(ctx->nalu_size);
+
+ // assemble NAL unit using data from previous data chunks (pc->buffer) and the current one (data)
+ evc_assemble_nalu(s, data, ctx->to_read, nalu, ctx->nalu_size, avctx);
+
+ if (parse_nal_unit(s, nalu, ctx->nalu_size, avctx) != 0) {
+ av_log(avctx, AV_LOG_ERROR, "Parsing of NAL unit failed\n");
+ return AVERROR_INVALIDDATA;
+ }
+ av_free(nalu);
+
+ // update variable storing amout of read bytes for teh current AU
+ ctx->bytes_read += ctx->nalu_size;
+
+ // update data pointer and data size
+ data += ctx->to_read;
+ data_size -= ctx->to_read;
+
+ ctx->incomplete_nalu_read = 0;
+
+ if (end_of_access_unit_found(s, avctx)) {
+
+ // parser should return buffer that contains complete AU
+ int read_bytes = ctx->to_read;
+
+ ctx->to_read = 0;
+ ctx->bytes_read = 0;
+
+ return read_bytes;
+ }
+
+ // reset variable storing amount of bytes to read from the new data chunk
+ ctx->to_read = 0;
+
+ continue;
+ }
+ } else {
+ // needed more input data to assemble complete valid NAL Unit
+ ctx->to_read = ctx->to_read - data_size;
+ return END_NOT_FOUND;
+ }
+ }
+ }
+
+ return END_NOT_FOUND;
+}
+
+static int evc_parse(AVCodecParserContext *s, AVCodecContext *avctx,
+ const uint8_t **poutbuf, int *poutbuf_size,
+ const uint8_t *buf, int buf_size)
+{
+ int next;
+ EVCParserContext *ev = s->priv_data;
+ ParseContext *pc = &ev->pc;
+
+ if (s->flags & PARSER_FLAG_COMPLETE_FRAMES)
+ next = buf_size;
+ else {
+ next = evc_find_frame_end(s, buf, buf_size, avctx);
+ if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
+ *poutbuf = NULL;
+ *poutbuf_size = 0;
+ return buf_size;
+ }
+ }
+
+ // poutbuf contains just one Access Unit
+ *poutbuf = buf;
+ *poutbuf_size = buf_size;
+
+ return next;
+}
+
+static int evc_parser_init(AVCodecParserContext *s)
+{
+ EVCParserContext *ev = s->priv_data;
+ ev->incomplete_nalu_prefix_read = 0;
+
+ return 0;
+}
+
+const AVCodecParser ff_evc_parser = {
+ .codec_ids = { AV_CODEC_ID_EVC },
+ .priv_data_size = sizeof(EVCParserContext),
+ .parser_init = evc_parser_init,
+ .parser_parse = evc_parse,
+ .parser_close = ff_parse_close,
+};
@@ -41,6 +41,7 @@ extern const AVCodecParser ff_dvaudio_parser;
extern const AVCodecParser ff_dvbsub_parser;
extern const AVCodecParser ff_dvdsub_parser;
extern const AVCodecParser ff_dvd_nav_parser;
+extern const AVCodecParser ff_evc_parser;
extern const AVCodecParser ff_flac_parser;
extern const AVCodecParser ff_ftr_parser;
extern const AVCodecParser ff_g723_1_parser;
- Added constants definitions for EVC parser - Provided NAL units parsing following ISO_IEC_23094-1 - EVC parser registration Signed-off-by: Dawid Kozinski <d.kozinski@samsung.com> --- libavcodec/Makefile | 1 + libavcodec/evc.h | 155 +++++ libavcodec/evc_parser.c | 1417 +++++++++++++++++++++++++++++++++++++++ libavcodec/parsers.c | 1 + 4 files changed, 1574 insertions(+) create mode 100644 libavcodec/evc.h create mode 100644 libavcodec/evc_parser.c