avcodec/evc_parser: Added parser implementation for EVC format

- 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>

7 files changed, 1519 insertions, 0 deletions

diff --git a/configure b/configure
index 4ac7cc6c0b..c9a86e9f8e 100755
--- a/configure
+++ b/configure
@@ -2483,6 +2483,7 @@ CONFIG_EXTRA="
     dnn
     dovi_rpu
     dvprofile
+    evcparse
     exif
     faandct
     faanidct
@@ -3321,6 +3322,7 @@ av1_amf_encoder_deps="amf"
 # parsers
 aac_parser_select="adts_header mpeg4audio"
 av1_parser_select="cbs_av1"
+evc_parser_select="golomb evcparse"
 h264_parser_select="golomb h264dsp h264parse h264_sei"
 hevc_parser_select="hevcparse hevc_sei"
 mpegaudio_parser_select="mpegaudioheader"
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 2efab60d7d..a28919992a 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -84,6 +84,7 @@ OBJS-$(CONFIG_DCT)                     += dct.o dct32_fixed.o dct32_float.o
 OBJS-$(CONFIG_DEFLATE_WRAPPER)         += zlib_wrapper.o
 OBJS-$(CONFIG_DOVI_RPU)                += dovi_rpu.o
 OBJS-$(CONFIG_ERROR_RESILIENCE)        += error_resilience.o
+OBJS-$(CONFIG_EVCPARSE)                += evc_parse.o
 OBJS-$(CONFIG_EXIF)                    += exif.o tiff_common.o
 OBJS-$(CONFIG_FAANDCT)                 += faandct.o
 OBJS-$(CONFIG_FAANIDCT)                += faanidct.o
@@ -1168,6 +1169,7 @@ 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
diff --git a/libavcodec/evc.h b/libavcodec/evc.h
new file mode 100644
index 0000000000..d1fdb4fac6
--- /dev/null
+++ b/libavcodec/evc.h
@@ -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
diff --git a/libavcodec/evc_parse.c b/libavcodec/evc_parse.c
new file mode 100644
index 0000000000..f69d7ffb6b
--- /dev/null
+++ b/libavcodec/evc_parse.c
@@ -0,0 +1,767 @@
+/*
+ * 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 "golomb.h"
+#include "parser.h"
+#include "evc.h"
+#include "evc_parse.h"
+
+#define EXTENDED_SAR            255
+
+#define NUM_CHROMA_FORMATS      4   // @see ISO_IEC_23094-1 section 6.2 table 2
+
+static const enum AVPixelFormat pix_fmts_8bit[NUM_CHROMA_FORMATS] = {
+    AV_PIX_FMT_GRAY8, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P
+};
+
+static const enum AVPixelFormat pix_fmts_9bit[NUM_CHROMA_FORMATS] = {
+    AV_PIX_FMT_GRAY9, AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9
+};
+
+static const enum AVPixelFormat pix_fmts_10bit[NUM_CHROMA_FORMATS] = {
+    AV_PIX_FMT_GRAY10, AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10
+};
+
+static const enum AVPixelFormat pix_fmts_12bit[NUM_CHROMA_FORMATS] = {
+    AV_PIX_FMT_GRAY12, AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12
+};
+
+static const enum AVPixelFormat pix_fmts_14bit[NUM_CHROMA_FORMATS] = {
+    AV_PIX_FMT_GRAY14, AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14
+};
+
+static const enum AVPixelFormat pix_fmts_16bit[NUM_CHROMA_FORMATS] = {
+    AV_PIX_FMT_GRAY16, AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16
+};
+
+// nuh_temporal_id specifies a temporal identifier for the NAL unit
+int ff_evc_get_temporal_id(const uint8_t *bits, int bits_size, void *logctx)
+{
+    int temporal_id = 0;
+    uint16_t t = 0;
+
+    if (bits_size < EVC_NALU_HEADER_SIZE) {
+        av_log(logctx, AV_LOG_ERROR, "Can't read NAL unit header\n");
+        return 0;
+    }
+
+    // forbidden_zero_bit
+    if ((bits[0] & 0x80) != 0)
+        return -1;
+
+    t = AV_RB16(bits);
+
+    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)
+EVCParserSPS *ff_evc_parse_sps(EVCParserContext *ctx, const uint8_t *bs, int bs_size)
+{
+    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;
+
+    if(!ctx->sps[sps_seq_parameter_set_id]) {
+        if((ctx->sps[sps_seq_parameter_set_id] = av_malloc(sizeof(EVCParserSPS))) == NULL)
+            return NULL;
+    }
+
+    sps = ctx->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
+//
+EVCParserPPS *ff_evc_parse_pps(EVCParserContext *ctx, const uint8_t *bs, int bs_size)
+{
+    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;
+
+    if(!ctx->pps[pps_pic_parameter_set_id]) {
+        if((ctx->pps[pps_pic_parameter_set_id] = av_malloc(sizeof(EVCParserSPS))) == NULL)
+            return NULL;
+    }
+
+    pps = ctx->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)
+EVCParserSliceHeader *ff_evc_parse_slice_header(EVCParserContext *ctx, const uint8_t *bs, int bs_size)
+{
+    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;
+
+    if(!ctx->slice_header[slice_pic_parameter_set_id]) {
+        if((ctx->slice_header[slice_pic_parameter_set_id] = av_malloc(sizeof(EVCParserSliceHeader))) == NULL)
+            return NULL;
+    }
+
+    sh = ctx->slice_header[slice_pic_parameter_set_id];
+
+    pps = ctx->pps[slice_pic_parameter_set_id];
+    if(!pps)
+        return NULL;
+
+    sps = ctx->sps[slice_pic_parameter_set_id];
+    if(!sps)
+        return NULL;
+
+    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 (ctx->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 (ctx->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;
+}
+
+int ff_evc_parse_nal_unit(EVCParserContext *ctx, const uint8_t *buf, int buf_size, void *logctx)
+{
+    int nalu_type, nalu_size;
+    int tid;
+    const uint8_t *data = buf;
+    int data_size = buf_size;
+
+    // ctx->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
+    ctx->key_frame = -1;
+
+    nalu_size = buf_size;
+    if (nalu_size <= 0) {
+        av_log(logctx, 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 = evc_get_nalu_type(data, data_size, logctx);
+    if (nalu_type < EVC_NOIDR_NUT || nalu_type > EVC_UNSPEC_NUT62) {
+        av_log(logctx, AV_LOG_ERROR, "Invalid NAL unit type: (%d)\n", nalu_type);
+        return AVERROR_INVALIDDATA;
+    }
+    ctx->nalu_type = nalu_type;
+
+    tid = ff_evc_get_temporal_id(data, data_size, logctx);
+    if (tid < 0) {
+        av_log(logctx, AV_LOG_ERROR, "Invalid temporial id: (%d)\n", tid);
+        return AVERROR_INVALIDDATA;
+    }
+    ctx->nuh_temporal_id = tid;
+
+    data += EVC_NALU_HEADER_SIZE;
+    data_size -= EVC_NALU_HEADER_SIZE;
+
+    switch(nalu_type) {
+    case EVC_SPS_NUT: {
+        EVCParserSPS *sps;
+        int SubGopLength;
+        int bit_depth;
+
+        sps = ff_evc_parse_sps(ctx, data, nalu_size);
+        if (!sps) {
+            av_log(logctx, AV_LOG_ERROR, "SPS parsing error\n");
+            return AVERROR_INVALIDDATA;
+        }
+
+        ctx->coded_width         = sps->pic_width_in_luma_samples;
+        ctx->coded_height        = sps->pic_height_in_luma_samples;
+
+        if(sps->picture_cropping_flag) {
+            ctx->width           = sps->pic_width_in_luma_samples  - sps->picture_crop_left_offset - sps->picture_crop_right_offset;
+            ctx->height          = sps->pic_height_in_luma_samples - sps->picture_crop_top_offset  - sps->picture_crop_bottom_offset;
+        } else {
+            ctx->width           = sps->pic_width_in_luma_samples;
+            ctx->height          = sps->pic_height_in_luma_samples;
+        }
+
+        SubGopLength = (int)pow(2.0, sps->log2_sub_gop_length);
+        ctx->gop_size = SubGopLength;
+
+        ctx->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) ctx->profile = FF_PROFILE_EVC_MAIN;
+        else ctx->profile = FF_PROFILE_EVC_BASELINE;
+
+        if (sps->vui_parameters_present_flag) {
+            if (sps->vui_parameters.timing_info_present_flag) {
+                int64_t num = sps->vui_parameters.num_units_in_tick;
+                int64_t den = sps->vui_parameters.time_scale;
+                if (num != 0 && den != 0)
+                    av_reduce(&ctx->framerate.den, &ctx->framerate.num, num, den, 1 << 30);
+            }
+        }
+
+        bit_depth = sps->bit_depth_chroma_minus8 + 8;
+        ctx->format = AV_PIX_FMT_NONE;
+
+        switch (bit_depth) {
+        case 8:
+            ctx->format = pix_fmts_8bit[sps->chroma_format_idc];
+            break;
+        case 9:
+            ctx->format = pix_fmts_9bit[sps->chroma_format_idc];
+            break;
+        case 10:
+            ctx->format = pix_fmts_10bit[sps->chroma_format_idc];
+            break;
+        case 12:
+            ctx->format = pix_fmts_12bit[sps->chroma_format_idc];
+            break;
+        case 14:
+            ctx->format = pix_fmts_14bit[sps->chroma_format_idc];
+            break;
+        case 16:
+            ctx->format = pix_fmts_16bit[sps->chroma_format_idc];
+            break;
+        }
+        av_assert0(ctx->format != AV_PIX_FMT_NONE);
+
+        break;
+    }
+    case EVC_PPS_NUT: {
+        EVCParserPPS *pps;
+
+        pps = ff_evc_parse_pps(ctx, data, nalu_size);
+        if (!pps) {
+            av_log(logctx, AV_LOG_ERROR, "PPS parsing error\n");
+            return AVERROR_INVALIDDATA;
+        }
+        break;
+    }
+    case EVC_SEI_NUT:   // Supplemental Enhancement Information
+    case EVC_APS_NUT:   // Adaptation parameter set
+    case EVC_FD_NUT:    // Filler data
+        break;
+    case EVC_IDR_NUT:   // Coded slice of a IDR or non-IDR picture
+    case EVC_NOIDR_NUT: {
+        EVCParserSliceHeader *sh;
+        EVCParserSPS *sps;
+        int slice_pic_parameter_set_id;
+
+        sh = ff_evc_parse_slice_header(ctx, data, nalu_size);
+        if (!sh) {
+            av_log(logctx, AV_LOG_ERROR, "Slice header parsing error\n");
+            return AVERROR_INVALIDDATA;
+        }
+
+        switch (sh->slice_type) {
+        case EVC_SLICE_TYPE_B: {
+            ctx->pict_type =  AV_PICTURE_TYPE_B;
+            break;
+        }
+        case EVC_SLICE_TYPE_P: {
+            ctx->pict_type =  AV_PICTURE_TYPE_P;
+            break;
+        }
+        case EVC_SLICE_TYPE_I: {
+            ctx->pict_type =  AV_PICTURE_TYPE_I;
+            break;
+        }
+        default: {
+            ctx->pict_type =  AV_PICTURE_TYPE_NONE;
+        }
+        }
+
+        ctx->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 = ctx->sps[slice_pic_parameter_set_id];
+
+        if (sps && sps->sps_pocs_flag) {
+
+            int PicOrderCntMsb = 0;
+            ctx->poc.prevPicOrderCntVal = ctx->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 = ctx->poc.PicOrderCntVal & (MaxPicOrderCntLsb - 1);
+                int prevPicOrderCntMsb = ctx->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;
+            }
+            ctx->poc.PicOrderCntVal = PicOrderCntMsb + sh->slice_pic_order_cnt_lsb;
+
+        } else {
+            if (nalu_type == EVC_IDR_NUT) {
+                ctx->poc.PicOrderCntVal = 0;
+                ctx->poc.DocOffset = -1;
+            } else {
+                int SubGopLength = (int)pow(2.0, sps->log2_sub_gop_length);
+                if (tid == 0) {
+                    ctx->poc.PicOrderCntVal = ctx->poc.prevPicOrderCntVal + SubGopLength;
+                    ctx->poc.DocOffset = 0;
+                    ctx->poc.prevPicOrderCntVal = ctx->poc.PicOrderCntVal;
+                } else {
+                    int ExpectedTemporalId;
+                    int PocOffset;
+                    int prevDocOffset = ctx->poc.DocOffset;
+
+                    ctx->poc.DocOffset = (prevDocOffset + 1) % SubGopLength;
+                    if (ctx->poc.DocOffset == 0) {
+                        ctx->poc.prevPicOrderCntVal += SubGopLength;
+                        ExpectedTemporalId = 0;
+                    } else
+                        ExpectedTemporalId = 1 + (int)log2(ctx->poc.DocOffset);
+                    while (tid != ExpectedTemporalId) {
+                        ctx->poc.DocOffset = (ctx->poc.DocOffset + 1) % SubGopLength;
+                        if (ctx->poc.DocOffset == 0)
+                            ExpectedTemporalId = 0;
+                        else
+                            ExpectedTemporalId = 1 + (int)log2(ctx->poc.DocOffset);
+                    }
+                    PocOffset = (int)(SubGopLength * ((2.0 * ctx->poc.DocOffset + 1) / (int)pow(2.0, tid) - 2));
+                    ctx->poc.PicOrderCntVal = ctx->poc.prevPicOrderCntVal + PocOffset;
+                }
+            }
+        }
+
+        ctx->output_picture_number = ctx->poc.PicOrderCntVal;
+        ctx->key_frame = (nalu_type == EVC_IDR_NUT) ? 1 : 0;
+
+        break;
+    }
+    }
+
+    return 0;
+}
+
diff --git a/libavcodec/evc_parse.h b/libavcodec/evc_parse.h
new file mode 100644
index 0000000000..d74a3b5159
--- /dev/null
+++ b/libavcodec/evc_parse.h
@@ -0,0 +1,357 @@
+/*
+ * 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
+ */
+
+/**
+ * @file
+ * EVC decoder/parser shared code
+ */
+
+#ifndef AVCODEC_EVC_PARSE_H
+#define AVCODEC_EVC_PARSE_H
+
+#define EVC_MAX_QP_TABLE_SIZE   58
+#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];
+
+    EVCParserPoc poc;
+
+    int nuh_temporal_id;            // the value of TemporalId (shall be the same for all VCL NAL units of an Access Unit)
+    int nalu_type;                  // the current NALU type
+
+    // Dimensions of the decoded video intended for presentation.
+    int width;
+    int height;
+
+    // Dimensions of the coded video.
+    int coded_width;
+    int coded_height;
+
+    // The format of the coded data, corresponds to enum AVPixelFormat
+    int format;
+
+    // AV_PICTURE_TYPE_I, EVC_SLICE_TYPE_P, AV_PICTURE_TYPE_B
+    int pict_type;
+
+    // Set by parser to 1 for key frames and 0 for non-key frames
+    int key_frame;
+
+    // Picture number incremented in presentation or output order.
+    // This corresponds to EVCEVCParserPoc::PicOrderCntVal
+    int output_picture_number;
+
+    // profile
+    // 0: FF_PROFILE_EVC_BASELINE
+    // 1: FF_PROFILE_EVC_MAIN
+    int profile;
+
+    // Framerate value in the compressed bitstream
+    AVRational framerate;
+
+    // Number of pictures in a group of pictures
+    int gop_size;
+
+    // Number of frames the decoded output will be delayed relative to the encoded input
+    int delay;
+
+    int parsed_extradata;
+
+} EVCParserContext;
+
+static inline int evc_get_nalu_type(const uint8_t *bits, int bits_size, void *logctx)
+{
+    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) {
+            av_log(logctx, AV_LOG_ERROR, "Invalid NAL unit header\n");
+            return -1;
+        }
+
+        // nal_unit_type
+        unit_type_plus1 = (p[0] >> 1) & 0x3F;
+    }
+
+    return unit_type_plus1 - 1;
+}
+
+static inline uint32_t evc_read_nal_unit_length(const uint8_t *bits, int bits_size, void *logctx)
+{
+    uint32_t nalu_len = 0;
+
+    if (bits_size < EVC_NALU_LENGTH_PREFIX_SIZE) {
+        av_log(logctx, AV_LOG_ERROR, "Can't read NAL unit length\n");
+        return 0;
+    }
+
+    nalu_len = AV_RB32(bits);
+
+    return nalu_len;
+}
+
+// nuh_temporal_id specifies a temporal identifier for the NAL unit
+int ff_evc_get_temporal_id(const uint8_t *bits, int bits_size, void *logctx);
+
+// @see ISO_IEC_23094-1 (7.3.2.1 SPS RBSP syntax)
+EVCParserSPS *ff_evc_parse_sps(EVCParserContext *ctx, const uint8_t *bs, int bs_size);
+
+// @see ISO_IEC_23094-1 (7.3.2.2 SPS RBSP syntax)
+EVCParserPPS *ff_evc_parse_pps(EVCParserContext *ctx, const uint8_t *bs, int bs_size);
+
+// @see ISO_IEC_23094-1 (7.3.2.6 Slice layer RBSP syntax)
+EVCParserSliceHeader *ff_evc_parse_slice_header(EVCParserContext *ctx, const uint8_t *bs, int bs_size);
+
+int ff_evc_parse_nal_unit(EVCParserContext *ctx, const uint8_t *buf, int buf_size, void *logctx);
+
+#endif /* AVCODEC_EVC_PARSE_H */
diff --git a/libavcodec/evc_parser.c b/libavcodec/evc_parser.c
new file mode 100644
index 0000000000..7528fb13db
--- /dev/null
+++ b/libavcodec/evc_parser.c
@@ -0,0 +1,235 @@
+/*
+ * 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 "parser.h"
+#include "bytestream.h"
+#include "evc.h"
+#include "evc_parse.h"
+
+/**
+ * Parse NAL units of found picture and decode some basic information.
+ *
+ * @param s codec parser context
+ * @param avctx codec context
+ * @param buf buffer with field/frame data
+ * @param buf_size size of the buffer
+ */
+static int parse_nal_units(AVCodecParserContext *s, AVCodecContext *avctx, const uint8_t *buf, int buf_size)
+{
+    EVCParserContext *ctx = s->priv_data;
+    const uint8_t *data = buf;
+    int data_size = buf_size;
+    int bytes_read = 0;
+    int nalu_size = 0;
+
+    while (data_size > 0) {
+
+        // Buffer size is not enough for buffer to store NAL unit 4-bytes prefix (length)
+        if (data_size < EVC_NALU_LENGTH_PREFIX_SIZE)
+            return AVERROR_INVALIDDATA;
+
+        nalu_size = evc_read_nal_unit_length(data, data_size, avctx);
+
+        bytes_read += EVC_NALU_LENGTH_PREFIX_SIZE;
+
+        data += EVC_NALU_LENGTH_PREFIX_SIZE;
+        data_size -= EVC_NALU_LENGTH_PREFIX_SIZE;
+
+        if (data_size < nalu_size)
+            return AVERROR_INVALIDDATA;
+
+        if (ff_evc_parse_nal_unit(ctx, data, nalu_size, avctx) != 0) {
+            av_log(avctx, AV_LOG_ERROR, "Parsing of NAL unit failed\n");
+            return AVERROR_INVALIDDATA;
+        }
+
+        if(ctx->nalu_type == EVC_SPS_NUT) {
+
+            s->coded_width         = ctx->coded_width;
+            s->coded_height        = ctx->coded_height;
+            s->width               = ctx->width;
+            s->height              = ctx->height;
+
+            s->format              = ctx->format;
+
+            avctx->gop_size        = ctx->gop_size;
+            avctx->delay           = ctx->delay;
+            avctx->profile         = ctx->profile;
+
+        } else if(ctx->nalu_type == EVC_NOIDR_NUT || ctx->nalu_type == EVC_IDR_NUT) {
+
+            s->pict_type = ctx->pict_type;
+            s->key_frame = ctx->key_frame;
+            s->output_picture_number = ctx->output_picture_number;
+
+        }
+
+        data += nalu_size;
+        data_size -= nalu_size;
+    }
+    return 0;
+}
+
+// Decoding nal units from evcC (EVCDecoderConfigurationRecord)
+// @see @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.2
+static int decode_extradata(EVCParserContext *ctx, const uint8_t *data, int size, void *logctx)
+{
+    int ret = 0;
+    GetByteContext gb;
+
+    bytestream2_init(&gb, data, size);
+
+    if (!data || size <= 0)
+        return -1;
+
+    // extradata is encoded as evcC format.
+    if (data[0] == 1) {
+        int num_of_arrays;  // indicates the number of arrays of NAL units of the indicated type(s)
+
+        int nalu_length_field_size; // indicates the length in bytes of the NALUnitLenght field in EVC video stream sample in the stream
+        // The value of this field shall be one of 0, 1, or 3 corresponding to a length encoded with 1, 2, or 4 bytes, respectively.
+
+        if (bytestream2_get_bytes_left(&gb) < 18) {
+            av_log(logctx, AV_LOG_ERROR, "evcC %d too short\n", size);
+            return AVERROR_INVALIDDATA;
+        }
+
+        bytestream2_skip(&gb, 16);
+
+        // @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.3
+        // LengthSizeMinusOne plus 1 indicates the length in bytes of the NALUnitLength field in a EVC video stream sample in the stream to which this configuration record applies. For example, a size of one byte is indicated with a value of 0.
+        // The value of this field shall be one of 0, 1, or 3 corresponding to a length encoded with 1, 2, or 4 bytes, respectively.
+        nalu_length_field_size = (bytestream2_get_byte(&gb) & 3) + 1;
+        if( nalu_length_field_size != 1 &&
+            nalu_length_field_size != 2 &&
+            nalu_length_field_size != 4 ) {
+            av_log(logctx, AV_LOG_ERROR, "The length in bytes of the NALUnitLenght field in a EVC video stream has unsupported value of %d\n", nalu_length_field_size);
+            return AVERROR_INVALIDDATA;
+        }
+
+        num_of_arrays = bytestream2_get_byte(&gb);
+
+        /* Decode nal units from evcC. */
+        for (int i = 0; i < num_of_arrays; i++) {
+
+            // @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.3
+            // NAL_unit_type indicates the type of the NAL units in the following array (which shall be all of that type);
+            // - it takes a value as defined in ISO/IEC 23094-1;
+            // - it is restricted to take one of the values indicating a SPS, PPS, APS, or SEI NAL unit.
+            int nal_unit_type = bytestream2_get_byte(&gb) & 0x3f;
+            int num_nalus  = bytestream2_get_be16(&gb);
+
+            for (int j = 0; j < num_nalus; j++) {
+
+                int nal_unit_length = bytestream2_get_be16(&gb);
+
+                if (bytestream2_get_bytes_left(&gb) < nal_unit_length) {
+                    av_log(logctx, AV_LOG_ERROR, "Invalid NAL unit size in extradata.\n");
+                    return AVERROR_INVALIDDATA;
+                }
+
+                if( nal_unit_type == EVC_SPS_NUT ||
+                    nal_unit_type == EVC_PPS_NUT ||
+                    nal_unit_type == EVC_APS_NUT ||
+                    nal_unit_type == EVC_SEI_NUT ) {
+                    if (ff_evc_parse_nal_unit(ctx, gb.buffer, nal_unit_length, logctx) != 0) {
+                        av_log(logctx, AV_LOG_ERROR, "Parsing of NAL unit failed\n");
+                        return AVERROR_INVALIDDATA;
+                    }
+                }
+
+                bytestream2_skip(&gb, nal_unit_length);
+            }
+        }
+    } else
+        return -1;
+
+    return ret;
+}
+
+static int evc_parse(AVCodecParserContext *s, AVCodecContext *avctx,
+                     const uint8_t **poutbuf, int *poutbuf_size,
+                     const uint8_t *buf, int buf_size)
+{
+    int next;
+    int ret;
+    EVCParserContext *ctx = s->priv_data;
+
+    if (avctx->extradata && !ctx->parsed_extradata) {
+        decode_extradata(ctx, avctx->extradata, avctx->extradata_size, avctx);
+        ctx->parsed_extradata = 1;
+    }
+
+    next = buf_size;
+
+    ret = parse_nal_units(s, avctx, buf, buf_size);
+    if(ret < 0) {
+        *poutbuf      = NULL;
+        *poutbuf_size = 0;
+        return buf_size;
+    }
+
+    s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
+
+    // poutbuf contains just one Access Unit
+    *poutbuf      = buf;
+    *poutbuf_size = buf_size;
+
+    return next;
+}
+
+static int evc_parser_init(AVCodecParserContext *s)
+{
+    EVCParserContext *ctx = s->priv_data;
+
+    memset(ctx->sps, 0, sizeof(EVCParserSPS *)*EVC_MAX_SPS_COUNT);
+    memset(ctx->pps, 0, sizeof(EVCParserPPS *)*EVC_MAX_PPS_COUNT);
+    memset(ctx->slice_header, 0, sizeof(EVCParserSliceHeader *)*EVC_MAX_PPS_COUNT);
+
+    return 0;
+}
+
+static void evc_parser_close(AVCodecParserContext *s)
+{
+    EVCParserContext *ctx = s->priv_data;
+
+    for(int i = 0; i < EVC_MAX_SPS_COUNT; i++) {
+        EVCParserSPS *sps = ctx->sps[i];
+        av_freep(&sps);
+    }
+
+    for(int i = 0; i < EVC_MAX_PPS_COUNT; i++) {
+        EVCParserPPS *pps = ctx->pps[i];
+        EVCParserSliceHeader *sh = ctx->slice_header[i];
+
+        av_freep(&pps);
+        av_freep(&sh);
+    }
+}
+
+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   = evc_parser_close,
+};
diff --git a/libavcodec/parsers.c b/libavcodec/parsers.c
index d355808018..2c077ec3ae 100644
--- a/libavcodec/parsers.c
+++ b/libavcodec/parsers.c
@@ -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;