diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 450781886d..4045c002b7 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -73,6 +73,7 @@ OBJS-$(CONFIG_CBS)                     += cbs.o
 OBJS-$(CONFIG_CBS_AV1)                 += cbs_av1.o
 OBJS-$(CONFIG_CBS_H264)                += cbs_h2645.o h2645_parse.o
 OBJS-$(CONFIG_CBS_H265)                += cbs_h2645.o h2645_parse.o
+OBJS-$(CONFIG_CBS_H266)                += cbs_h2645.o h2645_parse.o
 OBJS-$(CONFIG_CBS_JPEG)                += cbs_jpeg.o
 OBJS-$(CONFIG_CBS_MPEG2)               += cbs_mpeg2.o
 OBJS-$(CONFIG_CBS_VP9)                 += cbs_vp9.o
diff --git a/libavcodec/cbs.c b/libavcodec/cbs.c
index f98531e131..2b4f3b2bea 100644
--- a/libavcodec/cbs.c
+++ b/libavcodec/cbs.c
@@ -38,6 +38,9 @@ static const CodedBitstreamType *cbs_type_table[] = {
 #if CONFIG_CBS_H265
     &ff_cbs_type_h265,
 #endif
+#if CONFIG_CBS_H266
+    &ff_cbs_type_h266,
+#endif
 #if CONFIG_CBS_JPEG
     &ff_cbs_type_jpeg,
 #endif
@@ -59,6 +62,9 @@ const enum AVCodecID ff_cbs_all_codec_ids[] = {
 #if CONFIG_CBS_H265
     AV_CODEC_ID_H265,
 #endif
+#if CONFIG_CBS_H266
+    AV_CODEC_ID_H266,
+#endif
 #if CONFIG_CBS_JPEG
     AV_CODEC_ID_MJPEG,
 #endif
diff --git a/libavcodec/cbs_h2645.c b/libavcodec/cbs_h2645.c
index 434322492c..0b884c1ed0 100644
--- a/libavcodec/cbs_h2645.c
+++ b/libavcodec/cbs_h2645.c
@@ -24,11 +24,13 @@
 #include "cbs_internal.h"
 #include "cbs_h264.h"
 #include "cbs_h265.h"
+#include "cbs_h266.h"
 #include "h264.h"
 #include "h264_sei.h"
 #include "h2645_parse.h"
 #include "hevc.h"
 #include "hevc_sei.h"
+#include "h266.h"
 
 
 static int cbs_read_ue_golomb(CodedBitstreamContext *ctx, GetBitContext *gbc,
@@ -256,6 +258,7 @@ static int cbs_h265_payload_extension_present(GetBitContext *gbc, uint32_t paylo
 #define FUNC_NAME(rw, codec, name) cbs_ ## codec ## _ ## rw ## _ ## name
 #define FUNC_H264(rw, name) FUNC_NAME(rw, h264, name)
 #define FUNC_H265(rw, name) FUNC_NAME(rw, h265, name)
+#define FUNC_H266(rw, name) FUNC_NAME(rw, h266, name)
 
 #define SUBSCRIPTS(subs, ...) (subs > 0 ? ((int[subs + 1]){ subs, __VA_ARGS__ }) : NULL)
 
@@ -364,6 +367,10 @@ static int cbs_h2645_read_more_rbsp_data(GetBitContext *gbc)
 #include "cbs_h265_syntax_template.c"
 #undef FUNC
 
+#define FUNC(name) FUNC_H266(READWRITE, name)
+#include "cbs_h266_syntax_template.c"
+#undef FUNC
+
 #undef READ
 #undef READWRITE
 #undef RWContext
@@ -679,6 +686,9 @@ cbs_h2645_replace_ps(4, PPS, pps, pic_parameter_set_id)
 cbs_h2645_replace_ps(5, VPS, vps, vps_video_parameter_set_id)
 cbs_h2645_replace_ps(5, SPS, sps, sps_seq_parameter_set_id)
 cbs_h2645_replace_ps(5, PPS, pps, pps_pic_parameter_set_id)
+cbs_h2645_replace_ps(6, VPS, vps, vps_video_parameter_set_id)
+cbs_h2645_replace_ps(6, SPS, sps, sps_seq_parameter_set_id)
+cbs_h2645_replace_ps(6, PPS, pps, pps_pic_parameter_set_id)
 
 static int cbs_h264_read_nal_unit(CodedBitstreamContext *ctx,
                                   CodedBitstreamUnit *unit)
@@ -920,6 +930,117 @@ static int cbs_h265_read_nal_unit(CodedBitstreamContext *ctx,
     return 0;
 }
 
+static int cbs_h266_read_nal_unit(CodedBitstreamContext *ctx,
+                                  CodedBitstreamUnit *unit)
+{
+    GetBitContext gbc;
+    int err;
+
+    err = init_get_bits(&gbc, unit->data, 8 * unit->data_size);
+    if (err < 0)
+        return err;
+
+    err = ff_cbs_alloc_unit_content2(ctx, unit);
+    if (err < 0)
+        return err;
+
+    switch (unit->type) {
+    case H266_NAL_VPS:
+        {
+            H266RawVPS *vps = unit->content;
+
+            err = cbs_h266_read_vps(ctx, &gbc, vps);
+            if (err < 0)
+                return err;
+
+            err = cbs_h266_replace_vps(ctx, unit);
+            if (err < 0)
+                return err;
+        }
+        break;
+    case H266_NAL_SPS:
+        {
+            H266RawSPS *sps = unit->content;
+
+            err = cbs_h266_read_sps(ctx, &gbc, sps);
+            if (err < 0)
+                return err;
+
+            err = cbs_h266_replace_sps(ctx, unit);
+            if (err < 0)
+                return err;
+        }
+        break;
+
+    case H266_NAL_PPS:
+        {
+            H266RawPPS *pps = unit->content;
+
+            err = cbs_h266_read_pps(ctx, &gbc, pps);
+            if (err < 0)
+                return err;
+
+            err = cbs_h266_replace_pps(ctx, unit);
+            if (err < 0)
+                return err;
+        }
+        break;
+
+    case H266_NAL_TRAIL:
+    case H266_NAL_STSA:
+    case H266_NAL_RADL:
+    case H266_NAL_IDR_W_RADL:
+    case H266_NAL_IDR_N_LP:
+    case H266_NAL_CRA_NUT:
+    case H266_NAL_GDR_NUT:
+        {
+            H266RawSlice *slice = unit->content;
+            int pos, len;
+
+            err = cbs_h266_read_slice_header(ctx, &gbc, &slice->header);
+            if (err < 0)
+                return err;
+
+            if (!cbs_h2645_read_more_rbsp_data(&gbc))
+                return AVERROR_INVALIDDATA;
+
+            pos = get_bits_count(&gbc);
+            len = unit->data_size;
+
+            slice->data_size = len - pos / 8;
+            slice->data_ref  = av_buffer_ref(unit->data_ref);
+            if (!slice->data_ref)
+                return AVERROR(ENOMEM);
+            slice->data = unit->data + pos / 8;
+            slice->data_bit_start = pos % 8;
+        }
+        break;
+
+    case H266_NAL_AUD:
+        {
+            err = cbs_h266_read_aud(ctx, &gbc, unit->content);
+            if (err < 0)
+                return err;
+        }
+        break;
+
+    case H266_NAL_PREFIX_SEI:
+    case H266_NAL_SUFFIX_SEI:
+        {
+            err = cbs_h266_read_sei(ctx, &gbc, unit->content,
+                                    unit->type == H266_NAL_PREFIX_SEI);
+
+            if (err < 0)
+                return err;
+        }
+        break;
+
+    default:
+        return AVERROR(ENOSYS);
+    }
+    return 0;
+}
+
 static int cbs_h2645_write_slice_data(CodedBitstreamContext *ctx,
                                       PutBitContext *pbc, const uint8_t *data,
                                       size_t data_size, int data_bit_start)
@@ -1207,6 +1328,120 @@ static int cbs_h265_write_nal_unit(CodedBitstreamContext *ctx,
     return 0;
 }
 
+static int cbs_h266_write_nal_unit(CodedBitstreamContext *ctx,
+                                   CodedBitstreamUnit *unit,
+                                   PutBitContext *pbc)
+{
+    printf("TODO: cbs_h266_write_nal_unit");
+#if 0
+    int err;
+
+    switch (unit->type) {
+    case HEVC_NAL_VPS:
+        {
+            H265RawVPS *vps = unit->content;
+
+            err = cbs_h265_write_vps(ctx, pbc, vps);
+            if (err < 0)
+                return err;
+
+            err = cbs_h265_replace_vps(ctx, unit);
+            if (err < 0)
+                return err;
+        }
+        break;
+
+    case HEVC_NAL_SPS:
+        {
+            H265RawSPS *sps = unit->content;
+
+            err = cbs_h265_write_sps(ctx, pbc, sps);
+            if (err < 0)
+                return err;
+
+            err = cbs_h265_replace_sps(ctx, unit);
+            if (err < 0)
+                return err;
+        }
+        break;
+
+    case HEVC_NAL_PPS:
+        {
+            H265RawPPS *pps = unit->content;
+
+            err = cbs_h265_write_pps(ctx, pbc, pps);
+            if (err < 0)
+                return err;
+
+            err = cbs_h265_replace_pps(ctx, unit);
+            if (err < 0)
+                return err;
+        }
+        break;
+
+    case HEVC_NAL_TRAIL_N:
+    case HEVC_NAL_TRAIL_R:
+    case HEVC_NAL_TSA_N:
+    case HEVC_NAL_TSA_R:
+    case HEVC_NAL_STSA_N:
+    case HEVC_NAL_STSA_R:
+    case HEVC_NAL_RADL_N:
+    case HEVC_NAL_RADL_R:
+    case HEVC_NAL_RASL_N:
+    case HEVC_NAL_RASL_R:
+    case HEVC_NAL_BLA_W_LP:
+    case HEVC_NAL_BLA_W_RADL:
+    case HEVC_NAL_BLA_N_LP:
+    case HEVC_NAL_IDR_W_RADL:
+    case HEVC_NAL_IDR_N_LP:
+    case HEVC_NAL_CRA_NUT:
+        {
+            H265RawSlice *slice = unit->content;
+
+            err = cbs_h265_write_slice_segment_header(ctx, pbc, &slice->header);
+            if (err < 0)
+                return err;
+
+            if (slice->data) {
+                err = cbs_h2645_write_slice_data(ctx, pbc, slice->data,
+                                                 slice->data_size,
+                                                 slice->data_bit_start);
+                if (err < 0)
+                    return err;
+            } else {
+                // No slice data - that was just the header.
+            }
+        }
+        break;
+
+    case HEVC_NAL_AUD:
+        {
+            err = cbs_h265_write_aud(ctx, pbc, unit->content);
+            if (err < 0)
+                return err;
+        }
+        break;
+
+    case HEVC_NAL_SEI_PREFIX:
+    case HEVC_NAL_SEI_SUFFIX:
+        {
+            err = cbs_h265_write_sei(ctx, pbc, unit->content,
+                                     unit->type == HEVC_NAL_SEI_PREFIX);
+
+            if (err < 0)
+                return err;
+        }
+        break;
+
+    default:
+        av_log(ctx->log_ctx, AV_LOG_ERROR, "Write unimplemented for "
+               "NAL unit type %"PRIu32".\n", unit->type);
+        return AVERROR_PATCHWELCOME;
+    }
+#endif
+    return 0;
+}
+
 static int cbs_h2645_assemble_fragment(CodedBitstreamContext *ctx,
                                        CodedBitstreamFragment *frag)
 {
@@ -1362,6 +1597,43 @@ static void cbs_h265_close(CodedBitstreamContext *ctx)
         av_buffer_unref(&h265->pps_ref[i]);
 }
 
+static void cbs_h266_flush(CodedBitstreamContext *ctx)
+{
+    CodedBitstreamH266Context *h266 = ctx->priv_data;
+
+    for (int i = 0; i < FF_ARRAY_ELEMS(h266->vps); i++) {
+        av_buffer_unref(&h266->vps_ref[i]);
+        h266->vps[i] = NULL;
+    }
+    for (int i = 0; i < FF_ARRAY_ELEMS(h266->sps); i++) {
+        av_buffer_unref(&h266->sps_ref[i]);
+        h266->sps[i] = NULL;
+    }
+    for (int i = 0; i < FF_ARRAY_ELEMS(h266->pps); i++) {
+        av_buffer_unref(&h266->pps_ref[i]);
+        h266->pps[i] = NULL;
+    }
+
+    h266->active_vps = NULL;
+    h266->active_sps = NULL;
+    h266->active_pps = NULL;
+}
+
+static void cbs_h266_close(CodedBitstreamContext *ctx)
+{
+    CodedBitstreamH266Context *h266 = ctx->priv_data;
+    int i;
+
+    ff_h2645_packet_uninit(&h266->common.read_packet);
+
+    for (i = 0; i < FF_ARRAY_ELEMS(h266->vps); i++)
+        av_buffer_unref(&h266->vps_ref[i]);
+    for (i = 0; i < FF_ARRAY_ELEMS(h266->sps); i++)
+        av_buffer_unref(&h266->sps_ref[i]);
+    for (i = 0; i < FF_ARRAY_ELEMS(h266->pps); i++)
+        av_buffer_unref(&h266->pps_ref[i]);
+}
+
 static void cbs_h264_free_sei_payload(H264RawSEIPayload *payload)
 {
     switch (payload->payload_type) {
@@ -1506,6 +1778,55 @@ static const CodedBitstreamUnitTypeDescriptor cbs_h265_unit_types[] = {
     CBS_UNIT_TYPE_END_OF_LIST
 };
 
+static void cbs_h266_free_sei(void *opaque, uint8_t *content)
+{
+}
+
+static const CodedBitstreamUnitTypeDescriptor cbs_h266_unit_types[] = {
+    CBS_UNIT_TYPE_INTERNAL_REF(H266_NAL_VPS, H266RawVPS, extension_data.data),
+    CBS_UNIT_TYPE_INTERNAL_REF(H266_NAL_SPS, H266RawSPS, extension_data.data),
+    CBS_UNIT_TYPE_INTERNAL_REF(H266_NAL_PPS, H266RawPPS, extension_data.data),
+
+    CBS_UNIT_TYPE_POD(H266_NAL_AUD, H266RawAUD),
+
+    {
+        // Slices of non-IRAP pictures.
+        .nb_unit_types         = CBS_UNIT_TYPE_RANGE,
+        .unit_type_range_start = H266_NAL_TRAIL,
+        .unit_type_range_end   = H266_NAL_RASL,
+
+        .content_type   = CBS_CONTENT_TYPE_INTERNAL_REFS,
+        .content_size   = sizeof(H266RawSlice),
+        .nb_ref_offsets = 1,
+        .ref_offsets    = { offsetof(H266RawSlice, data) },
+    },
+
+    {
+        // Slices of IRAP pictures.
+        .nb_unit_types         = CBS_UNIT_TYPE_RANGE,
+        .unit_type_range_start = H266_NAL_IDR_W_RADL,
+        .unit_type_range_end   = H266_NAL_GDR_NUT,
+
+        .content_type   = CBS_CONTENT_TYPE_INTERNAL_REFS,
+        .content_size   = sizeof(H266RawSlice),
+        .nb_ref_offsets = 1,
+        .ref_offsets    = { offsetof(H266RawSlice, data) },
+    },
+
+    {
+        .nb_unit_types  = 2,
+        .unit_types     = {
+            H266_NAL_PREFIX_SEI,
+            H266_NAL_SUFFIX_SEI
+        },
+        .content_type   = CBS_CONTENT_TYPE_COMPLEX,
+        .content_size   = sizeof(H266RawSEI),
+        .content_free   = &cbs_h266_free_sei,
+    },
+
+    CBS_UNIT_TYPE_END_OF_LIST
+};
+
 const CodedBitstreamType ff_cbs_type_h264 = {
     .codec_id          = AV_CODEC_ID_H264,
 
@@ -1538,6 +1859,22 @@ const CodedBitstreamType ff_cbs_type_h265 = {
     .close             = &cbs_h265_close,
 };
 
+const CodedBitstreamType ff_cbs_type_h266 = {
+    .codec_id          = AV_CODEC_ID_VVC,
+
+    .priv_data_size    = sizeof(CodedBitstreamH266Context),
+
+    .unit_types        = cbs_h266_unit_types,
+
+    .split_fragment    = &cbs_h2645_split_fragment,
+    .read_unit         = &cbs_h266_read_nal_unit,
+    .write_unit        = &cbs_h266_write_nal_unit,
+    .assemble_fragment = &cbs_h2645_assemble_fragment,
+
+    .flush             = &cbs_h266_flush,
+    .close             = &cbs_h266_close,
+};
+
 int ff_cbs_h264_add_sei_message(CodedBitstreamFragment *au,
                                 H264RawSEIPayload *payload)
 {
diff --git a/libavcodec/cbs_h266.h b/libavcodec/cbs_h266.h
new file mode 100644
index 0000000000..91d6ef4f9e
--- /dev/null
+++ b/libavcodec/cbs_h266.h
@@ -0,0 +1,711 @@
+/*
+ * 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_CBS_H266_H
+#define AVCODEC_CBS_H266_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "cbs_h2645.h"
+#include "h266.h"
+
+enum {
+    // This limit is arbitrary - it is sufficient for one message of each
+    // type plus some repeats, and will therefore easily cover all sane
+    // streams.  However, it is possible to make technically-valid streams
+    // for which it will fail (for example, by including a large number of
+    // user-data-unregistered messages).
+    H266_MAX_SEI_PAYLOADS = 64,
+};
+
+typedef struct H266RawNALUnitHeader {
+    uint8_t nuh_layer_id;
+    uint8_t nal_unit_type;
+    uint8_t nuh_temporal_id_plus1;
+} H266RawNALUnitHeader;
+
+typedef struct H266GeneralConstraintsInfo {
+    uint8_t gci_present_flag;
+} H266GeneralConstraintsInfo;
+
+typedef struct H266RawProfileTierLevel {
+    uint8_t general_profile_idc;
+    uint8_t general_tier_flag;
+    uint8_t general_level_idc;
+    uint8_t ptl_frame_only_constraint_flag;
+    uint8_t ptl_multilayer_enabled_flag;
+    H266GeneralConstraintsInfo general_constraints_info;
+    uint8_t ptl_sublayer_level_present_flag[H266_MAX_SUB_LAYERS - 1];
+    uint8_t sublayer_level_idc[H266_MAX_SUB_LAYERS - 1];
+    uint8_t ptl_num_sub_profiles;
+    uint32_t general_sub_profile_idc[256];
+} H266RawProfileTierLevel;
+
+typedef struct H266RawExtensionData {
+    uint8_t     *data;
+    AVBufferRef *data_ref;
+    size_t       bit_length;
+} H266RawExtensionData;
+
+typedef struct H266DpbParameters {
+    uint8_t dpb_max_dec_pic_buffering_minus1[H266_MAX_SUB_LAYERS];
+    uint8_t dpb_max_num_reorder_pics[H266_MAX_SUB_LAYERS];
+    uint8_t dpb_max_latency_increase_plus1[H266_MAX_SUB_LAYERS];
+} H266DpbParameters;
+
+typedef struct H266RawVPS {
+    H266RawNALUnitHeader nal_unit_header;
+
+    uint8_t vps_video_parameter_set_id;
+
+    uint8_t vps_max_layers_minus1;
+    uint8_t vps_max_sublayers_minus1;
+    /*TODO add more*/
+    H266RawExtensionData extension_data;
+} H266RawVPS;
+//
+typedef struct H266RefPicListStruct {
+    uint8_t num_ref_entries;
+    uint8_t ltrp_in_header_flag;
+    uint8_t inter_layer_ref_pic_flag[H266_MAX_DPB_SIZE + 13];
+    uint8_t st_ref_pic_flag[H266_MAX_DPB_SIZE + 13];
+    uint8_t abs_delta_poc_st[H266_MAX_DPB_SIZE + 13];
+    uint8_t strp_entry_sign_flag[H266_MAX_DPB_SIZE + 13];
+    uint8_t rpls_poc_lsb_lt[H266_MAX_DPB_SIZE + 13];
+    uint8_t ilrp_idx[H266_MAX_DPB_SIZE + 13];
+
+    //calculated values;
+    uint8_t num_ltrp_entries;
+} H266RefPicListStruct;
+
+typedef struct H266RefPicLists {
+    uint8_t rpl_sps_flag[2];
+    uint8_t rpl_idx[2];
+    H266RefPicListStruct rpl_ref_list[2];
+    uint16_t poc_lsb_lt[2][H266_MAX_DPB_SIZE + 13];
+    uint8_t delta_poc_msb_cycle_present_flag[2][H266_MAX_DPB_SIZE + 13];
+    uint16_t delta_poc_msb_cycle_lt[2][H266_MAX_DPB_SIZE + 13];
+} H266RefPicLists;
+
+typedef struct H266RawGeneralTimingHrdParameters {
+    uint32_t num_units_in_tick;
+    uint32_t time_scale;
+    uint8_t general_nal_hrd_params_present_flag;
+    uint8_t general_vcl_hrd_params_present_flag;
+    uint8_t general_same_pic_timing_in_all_ols_flag;
+    uint8_t general_du_hrd_params_present_flag;
+    uint8_t tick_divisor_minus2;
+    uint8_t bit_rate_scale;
+    uint8_t cpb_size_scale;
+    uint8_t cpb_size_du_scale;
+    uint8_t hrd_cpb_cnt_minus1;
+} H266RawGeneralTimingHrdParameters;
+
+typedef struct H266RawSubLayerHRDParameters {
+    uint32_t bit_rate_value_minus1[H266_MAX_CPB_CNT];
+    uint32_t cpb_size_value_minus1[H266_MAX_CPB_CNT];
+    uint32_t cpb_size_du_value_minus1[H266_MAX_CPB_CNT];
+    uint32_t bit_rate_du_value_minus1[H266_MAX_CPB_CNT];
+    uint8_t cbr_flag[H266_MAX_CPB_CNT];
+} H266RawSubLayerHRDParameters;
+
+typedef struct H266RawOlsTimingHrdParameters {
+    uint8_t fixed_pic_rate_general_flag[H266_MAX_SUB_LAYERS];
+    uint8_t fixed_pic_rate_within_cvs_flag[H266_MAX_SUB_LAYERS];
+    uint16_t elemental_duration_in_tc_minus1[H266_MAX_SUB_LAYERS];
+    uint8_t low_delay_hrd_flag[H266_MAX_SUB_LAYERS];
+    H266RawSubLayerHRDParameters nal_sub_layer_hrd_parameters[H266_MAX_SUB_LAYERS];
+    H266RawSubLayerHRDParameters vcl_sub_layer_hrd_parameters[H266_MAX_SUB_LAYERS];
+} H266RawOlsTimingHrdParameters;
+
+typedef struct H266RawVUI {
+    uint8_t vui_progressive_source_flag;
+    uint8_t vui_interlaced_source_flag;
+    uint8_t vui_non_packed_constraint_flag;
+    uint8_t vui_non_projected_constraint_flag;
+
+    uint8_t vui_aspect_ratio_info_present_flag;
+    uint8_t vui_aspect_ratio_constant_flag;
+    uint8_t vui_aspect_ratio_idc;
+
+    uint16_t vui_sar_width;
+    uint16_t vui_sar_height;;
+
+    uint8_t vui_overscan_info_present_flag;
+    uint8_t vui_overscan_appropriate_flag;
+
+    uint8_t vui_colour_description_present_flag;
+    uint8_t vui_colour_primaries;
+
+    uint8_t vui_transfer_characteristics;
+    uint8_t vui_matrix_coeffs;
+    uint8_t vui_full_range_flag;
+
+    uint8_t vui_chroma_loc_info_present_flag;
+    uint8_t vui_chroma_sample_loc_type_frame;
+    uint8_t vui_chroma_sample_loc_type_top_field;
+    uint8_t vui_chroma_sample_loc_type_bottom_field;
+} H266RawVUI;
+
+typedef struct H266RawSPS {
+    H266RawNALUnitHeader nal_unit_header;
+
+    uint8_t sps_seq_parameter_set_id;
+    uint8_t sps_video_parameter_set_id;
+    uint8_t sps_max_sublayers_minus1;
+    uint8_t sps_chroma_format_idc;
+    uint8_t sps_log2_ctu_size_minus5;
+    uint8_t sps_ptl_dpb_hrd_params_present_flag;
+    H266RawProfileTierLevel profile_tier_level;
+    uint8_t sps_gdr_enabled_flag;
+    uint8_t sps_ref_pic_resampling_enabled_flag;
+    uint8_t sps_res_change_in_clvs_allowed_flag;
+
+    uint16_t sps_pic_width_max_in_luma_samples;
+    uint16_t sps_pic_height_max_in_luma_samples;
+
+    uint8_t sps_conformance_window_flag;
+    uint16_t sps_conf_win_left_offset;
+    uint16_t sps_conf_win_right_offset;
+    uint16_t sps_conf_win_top_offset;
+    uint16_t sps_conf_win_bottom_offset;
+
+    uint8_t sps_subpic_info_present_flag;
+    uint8_t sps_num_subpics_minus1;
+    uint8_t sps_independent_subpics_flag;
+    uint8_t sps_subpic_same_size_flag;
+    uint8_t sps_subpic_id_len_minus1;
+    uint8_t sps_subpic_id_mapping_explicitly_signalled_flag;
+    uint8_t sps_subpic_id_mapping_present_flag;
+
+
+    uint8_t sps_bitdepth_minus8;
+    uint8_t sps_entropy_coding_sync_enabled_flag;
+    uint8_t sps_entry_point_offsets_present_flag;
+
+    uint8_t sps_log2_max_pic_order_cnt_lsb_minus4;
+    uint8_t sps_poc_msb_cycle_flag;
+    uint8_t sps_poc_msb_cycle_len_minus1;
+
+    uint8_t sps_num_extra_ph_bytes;
+    uint8_t sps_extra_ph_bit_present_flag[16];
+    uint8_t num_extra_ph_bits;
+
+    uint8_t sps_num_extra_sh_bytes;
+    uint8_t sps_extra_sh_bit_present_flag[16];
+    uint8_t num_extra_sh_bits;
+
+    uint8_t sps_sublayer_dpb_params_flag;
+    H266DpbParameters sps_dpb_params;
+
+    uint8_t sps_log2_min_luma_coding_block_size_minus2;
+    uint8_t sps_partition_constraints_override_enabled_flag;
+    uint8_t sps_log2_diff_min_qt_min_cb_intra_slice_luma;
+    uint8_t sps_max_mtt_hierarchy_depth_intra_slice_luma;
+    uint8_t sps_log2_diff_max_bt_min_qt_intra_slice_luma;
+    uint8_t sps_log2_diff_max_tt_min_qt_intra_slice_luma;
+
+    uint8_t sps_qtbtt_dual_tree_intra_flag;
+    uint8_t sps_log2_diff_min_qt_min_cb_intra_slice_chroma;
+    uint8_t sps_max_mtt_hierarchy_depth_intra_slice_chroma;
+    uint8_t sps_log2_diff_max_bt_min_qt_intra_slice_chroma;
+    uint8_t sps_log2_diff_max_tt_min_qt_intra_slice_chroma;
+
+    uint8_t sps_log2_diff_min_qt_min_cb_inter_slice;
+    uint8_t sps_max_mtt_hierarchy_depth_inter_slice;
+    uint8_t sps_log2_diff_max_bt_min_qt_inter_slice;
+    uint8_t sps_log2_diff_max_tt_min_qt_inter_slice;
+
+    uint8_t sps_max_luma_transform_size_64_flag;
+
+    uint8_t sps_transform_skip_enabled_flag;
+    uint8_t sps_log2_transform_skip_max_size_minus2;
+    uint8_t sps_bdpcm_enabled_flag;
+
+    uint8_t sps_mts_enabled_flag;
+    uint8_t sps_explicit_mts_intra_enabled_flag;
+    uint8_t sps_explicit_mts_inter_enabled_flag;
+
+    uint8_t sps_lfnst_enabled_flag;
+
+    uint8_t sps_joint_cbcr_enabled_flag;
+    uint8_t sps_same_qp_table_for_chroma_flag;
+
+    int8_t sps_qp_table_start_minus26[H266_MAX_PLANES];
+    uint8_t sps_num_points_in_qp_table_minus1[H266_MAX_PLANES];
+    uint8_t sps_delta_qp_in_val_minus1[H266_MAX_PLANES][H266_MAX_POINTS_IN_QP_TABLE];
+    uint8_t sps_delta_qp_diff_val[H266_MAX_PLANES][H266_MAX_POINTS_IN_QP_TABLE];
+
+    uint8_t sps_sao_enabled_flag;
+    uint8_t sps_alf_enabled_flag;
+    uint8_t sps_ccalf_enabled_flag;
+    uint8_t sps_lmcs_enabled_flag;
+    uint8_t sps_weighted_pred_flag;
+    uint8_t sps_weighted_bipred_flag;
+    uint8_t sps_long_term_ref_pics_flag;
+    uint8_t sps_inter_layer_prediction_enabled_flag;
+    uint8_t sps_idr_rpl_present_flag;
+    uint8_t sps_rpl1_same_as_rpl0_flag;
+
+    uint8_t sps_num_ref_pic_lists[2];
+    H266RefPicListStruct sps_ref_pic_list_struct[2][H266_MAX_REF_PIC_LISTS];
+
+    uint8_t sps_ref_wraparound_enabled_flag;
+    uint8_t sps_temporal_mvp_enabled_flag;
+    uint8_t sps_sbtmvp_enabled_flag;
+    uint8_t sps_amvr_enabled_flag;
+    uint8_t sps_bdof_enabled_flag;
+    uint8_t sps_bdof_control_present_in_ph_flag;
+    uint8_t sps_smvd_enabled_flag;
+    uint8_t sps_dmvr_enabled_flag;
+    uint8_t sps_dmvr_control_present_in_ph_flag;
+    uint8_t sps_mmvd_enabled_flag;
+    uint8_t sps_mmvd_fullpel_only_enabled_flag;
+    uint8_t sps_six_minus_max_num_merge_cand;
+    uint8_t sps_sbt_enabled_flag;
+    uint8_t sps_affine_enabled_flag;
+    uint8_t sps_five_minus_max_num_subblock_merge_cand;
+    uint8_t sps_6param_affine_enabled_flag;
+    uint8_t sps_affine_amvr_enabled_flag;
+    uint8_t sps_affine_prof_enabled_flag;
+    uint8_t sps_prof_control_present_in_ph_flag;
+    uint8_t sps_bcw_enabled_flag;
+    uint8_t sps_ciip_enabled_flag;
+    uint8_t sps_gpm_enabled_flag;
+    uint8_t sps_max_num_merge_cand_minus_max_num_gpm_cand;
+    uint8_t sps_log2_parallel_merge_level_minus2;
+    uint8_t sps_isp_enabled_flag;
+    uint8_t sps_mrl_enabled_flag;
+    uint8_t sps_mip_enabled_flag;
+    uint8_t sps_cclm_enabled_flag;
+    uint8_t sps_chroma_horizontal_collocated_flag;
+    uint8_t sps_chroma_vertical_collocated_flag;
+    uint8_t sps_palette_enabled_flag;
+    uint8_t sps_act_enabled_flag;
+    uint8_t sps_min_qp_prime_ts;
+    uint8_t sps_ibc_enabled_flag;
+    uint8_t sps_six_minus_max_num_ibc_merge_cand;
+    uint8_t sps_ladf_enabled_flag;
+    uint8_t sps_num_ladf_intervals_minus2;
+    int8_t sps_ladf_lowest_interval_qp_offset;
+    int8_t sps_ladf_qp_offset[4];
+    uint8_t sps_ladf_delta_threshold_minus1[4];
+
+    uint8_t sps_explicit_scaling_list_enabled_flag;
+    uint8_t sps_scaling_matrix_for_lfnst_disabled_flag;
+    uint8_t sps_scaling_matrix_for_alternative_colour_space_disabled_flag;
+    uint8_t sps_scaling_matrix_designated_colour_space_flag;
+    uint8_t sps_dep_quant_enabled_flag;
+    uint8_t sps_sign_data_hiding_enabled_flag;
+
+    uint8_t sps_virtual_boundaries_enabled_flag;
+    uint8_t sps_virtual_boundaries_present_flag;
+    uint8_t sps_num_ver_virtual_boundaries;
+    uint16_t sps_virtual_boundary_pos_x_minus1[3];
+    uint8_t sps_num_hor_virtual_boundaries;
+    uint16_t sps_virtual_boundary_pos_y_minus1[3];
+
+    uint8_t sps_timing_hrd_params_present_flag;
+    uint8_t sps_sublayer_cpb_params_present_flag;
+    H266RawGeneralTimingHrdParameters sps_general_timing_hrd_parameters;
+    H266RawOlsTimingHrdParameters sps_ols_timing_hrd_parameters;
+
+    uint8_t sps_field_seq_flag;
+    uint8_t sps_vui_parameters_present_flag;
+    uint16_t sps_vui_payload_size_minus1;
+    H266RawVUI vui;
+
+    uint8_t sps_extension_flag;
+
+    H266RawExtensionData extension_data;
+
+    //caculated values
+    uint8_t qp_bd_offset;
+    uint8_t min_cb_log2_size_y;
+} H266RawSPS;
+
+typedef struct H266RawPPS {
+    H266RawNALUnitHeader nal_unit_header;
+
+    uint8_t pps_pic_parameter_set_id;
+    uint8_t pps_seq_parameter_set_id;
+    uint8_t pps_mixed_nalu_types_in_pic_flag;
+    uint16_t pps_pic_width_in_luma_samples;
+    uint16_t pps_pic_height_in_luma_samples;
+
+    uint8_t pps_conformance_window_flag;
+    uint16_t pps_conf_win_left_offset;
+    uint16_t pps_conf_win_right_offset;
+    uint16_t pps_conf_win_top_offset;
+    uint16_t pps_conf_win_bottom_offset;
+
+    uint8_t pps_scaling_window_explicit_signalling_flag;
+    int16_t pps_scaling_win_left_offset;
+    int16_t pps_scaling_win_right_offset;
+    int16_t pps_scaling_win_top_offset;
+    int16_t pps_scaling_win_bottom_offset;
+
+    uint8_t pps_output_flag_present_flag;
+    uint8_t pps_no_pic_partition_flag;
+    uint8_t pps_subpic_id_mapping_present_flag;
+    /* TODO: pps_subpic_id[ i ] */
+    uint8_t pps_log2_ctu_size_minus5;
+    uint8_t pps_num_exp_tile_columns_minus1;
+    uint8_t pps_num_exp_tile_rows_minus1;
+    uint16_t pps_tile_column_width_minus1[H266_MAX_TILE_COLUMNS];
+    uint16_t pps_tile_row_height_minus1[H266_MAX_TILE_ROWS];
+
+    uint8_t pps_loop_filter_across_tiles_enabled_flag;
+    uint8_t pps_rect_slice_flag;
+    uint8_t pps_single_slice_per_subpic_flag;
+    uint16_t pps_num_slices_in_pic_minus1;
+    uint8_t pps_tile_idx_delta_present_flag;
+
+    /* TODO:
+    uint16_t pps_slice_width_in_tiles_minus1[H266_MAX_TILE_COLUMNS];
+    uint16_t pps_slice_height_in_tiles_minus1[H266_MAX_TILE_ROWS];
+    */
+    uint8_t pps_loop_filter_across_slices_enabled_flag;
+    uint8_t pps_cabac_init_present_flag;
+    uint8_t pps_num_ref_idx_default_active_minus1[2];
+    uint8_t pps_rpl1_idx_present_flag;
+    uint8_t pps_weighted_pred_flag;
+    uint8_t pps_weighted_bipred_flag;
+    uint8_t pps_ref_wraparound_enabled_flag;
+    uint8_t pps_pic_width_minus_wraparound_offset;
+    int8_t pps_init_qp_minus26;
+    uint8_t pps_cu_qp_delta_enabled_flag;
+    uint8_t pps_chroma_tool_offsets_present_flag;
+    uint8_t pps_cb_qp_offset;
+    uint8_t pps_cr_qp_offset;
+    uint8_t pps_joint_cbcr_qp_offset_present_flag;
+    uint8_t pps_joint_cbcr_qp_offset_value;
+    uint8_t pps_slice_chroma_qp_offsets_present_flag;
+    uint8_t pps_cu_chroma_qp_offset_list_enabled_flag;
+    uint8_t pps_chroma_qp_offset_list_len_minus1;
+    uint8_t pps_cb_qp_offset_list[6];
+    uint8_t pps_cr_qp_offset_list[6];
+    uint8_t pps_joint_cbcr_qp_offset_list[6];
+    uint8_t pps_deblocking_filter_control_present_flag;
+    uint8_t pps_deblocking_filter_override_enabled_flag;
+    uint8_t pps_deblocking_filter_disabled_flag;
+    uint8_t pps_dbf_info_in_ph_flag;
+
+    uint8_t pps_luma_beta_offset_div2;
+    uint8_t pps_luma_tc_offset_div2;
+    uint8_t pps_cb_beta_offset_div2;
+    uint8_t pps_cb_tc_offset_div2;
+    uint8_t pps_cr_beta_offset_div2;
+    uint8_t pps_cr_tc_offset_div2;
+
+    uint8_t pps_rpl_info_in_ph_flag;
+    uint8_t pps_sao_info_in_ph_flag;
+    uint8_t pps_alf_info_in_ph_flag;
+    uint8_t pps_wp_info_in_ph_flag;
+    uint8_t pps_qp_delta_info_in_ph_flag;
+
+    uint8_t pps_picture_header_extension_present_flag;
+    uint8_t pps_slice_header_extension_present_flag;
+    uint8_t pps_extension_flag;
+    H266RawExtensionData extension_data;
+
+    //calculated value;
+    uint16_t num_tile_columns;
+    uint16_t num_tile_rows;
+    uint16_t num_tiles_in_pic;
+} H266RawPPS;
+
+typedef struct H266RawAUD {
+    H266RawNALUnitHeader nal_unit_header;
+    uint8_t aud_irap_or_gdr_flag;
+    uint8_t aud_pic_type;
+} H266RawAUD;
+
+typedef struct  H266RawPH {
+    uint8_t  ph_gdr_or_irap_pic_flag;
+    uint8_t  ph_non_ref_pic_flag;
+    uint8_t  ph_gdr_pic_flag;
+    uint8_t  ph_inter_slice_allowed_flag;
+    uint8_t  ph_intra_slice_allowed_flag;
+    uint8_t  ph_pic_parameter_set_id;
+    uint16_t ph_pic_order_cnt_lsb;
+    uint8_t  ph_recovery_poc_cnt;
+    uint8_t  ph_extra_bit[16];
+    uint8_t  ph_poc_msb_cycle_present_flag;
+    uint8_t  ph_poc_msb_cycle_val;
+    uint8_t  ph_alf_enabled_flag;
+    uint8_t  ph_num_alf_aps_ids_luma;
+    //uint8_t ph_alf_aps_id_luma[i]
+    uint8_t  ph_alf_cb_enabled_flag;
+    uint8_t  ph_alf_cr_enabled_flag;
+    uint8_t  ph_alf_aps_id_chroma;
+    uint8_t  ph_alf_cc_cb_enabled_flag;
+    uint8_t  ph_alf_cc_cb_aps_id;
+    uint8_t  ph_alf_cc_cr_enabled_flag;
+    uint8_t  ph_alf_cc_cr_aps_id;
+    uint8_t  ph_lmcs_enabled_flag;
+    uint8_t  ph_lmcs_aps_id;
+    uint8_t  ph_chroma_residual_scale_flag;
+    uint8_t  ph_explicit_scaling_list_enabled_flag;
+    uint8_t  ph_scaling_list_aps_id;
+    uint8_t  ph_virtual_boundaries_present_flag;
+    uint8_t  ph_num_ver_virtual_boundaries;
+    //ph_virtual_boundary_pos_x_minus1[ i ]
+    //ph_num_hor_virtual_boundaries
+    //ph_virtual_boundary_pos_y_minus1[ i ]
+
+    uint8_t ph_pic_output_flag;
+    H266RefPicLists ph_ref_pic_lists;
+
+    uint8_t ph_partition_constraints_override_flag;
+
+    uint8_t ph_log2_diff_min_qt_min_cb_intra_slice_luma;
+    uint8_t ph_max_mtt_hierarchy_depth_intra_slice_luma;
+    uint8_t ph_log2_diff_max_bt_min_qt_intra_slice_luma;
+    uint8_t ph_log2_diff_max_tt_min_qt_intra_slice_luma;
+    uint8_t ph_log2_diff_min_qt_min_cb_intra_slice_chroma;
+
+    uint8_t ph_max_mtt_hierarchy_depth_intra_slice_chroma;
+    uint8_t ph_log2_diff_max_bt_min_qt_intra_slice_chroma;
+    uint8_t ph_log2_diff_max_tt_min_qt_intra_slice_chroma;
+
+    uint8_t ph_cu_qp_delta_subdiv_intra_slice;
+    uint8_t ph_cu_chroma_qp_offset_subdiv_intra_slice;
+
+    uint8_t ph_log2_diff_min_qt_min_cb_inter_slice;
+    uint8_t ph_max_mtt_hierarchy_depth_inter_slice;
+    uint8_t ph_log2_diff_max_bt_min_qt_inter_slice;
+    uint8_t ph_log2_diff_max_tt_min_qt_inter_slice;
+    uint8_t ph_cu_qp_delta_subdiv_inter_slice;
+    uint8_t ph_cu_chroma_qp_offset_subdiv_inter_slice;
+
+    uint8_t ph_temporal_mvp_enabled_flag;
+    uint8_t ph_collocated_from_l0_flag;
+    uint8_t ph_collocated_ref_idx;
+    uint8_t ph_mmvd_fullpel_only_flag;
+    uint8_t ph_mvd_l1_zero_flag;
+    uint8_t ph_bdof_disabled_flag;
+    uint8_t ph_dmvr_disabled_flag;
+    uint8_t ph_prof_disabled_flag;
+    //pred_weight_table( );
+    uint8_t ph_qp_delta;
+    uint8_t ph_joint_cbcr_sign_flag;
+    uint8_t ph_sao_luma_enabled_flag;
+    uint8_t ph_sao_chroma_enabled_flag;
+    uint8_t ph_deblocking_params_present_flag;
+    uint8_t ph_deblocking_filter_disabled_flag;
+    uint8_t ph_luma_beta_offset_div2;
+    uint8_t ph_luma_tc_offset_div2;
+    uint8_t ph_cb_beta_offset_div2;
+    uint8_t ph_cb_tc_offset_div2;
+    uint8_t ph_cr_beta_offset_div2;
+    uint8_t ph_cr_tc_offset_div2;
+    uint8_t ph_extension_length;
+} H266RawPH;
+
+typedef struct  H266RawSliceHeader {
+    H266RawNALUnitHeader nal_unit_header;
+    uint8_t sh_picture_header_in_slice_header_flag;
+    H266RawPH sh_picture_header;
+
+    uint16_t sh_subpic_id;
+    uint16_t sh_slice_address;
+    uint8_t  sh_extra_bit[16];
+    uint8_t  sh_num_tiles_in_slice_minus1;
+    uint8_t  sh_slice_type;
+    uint8_t  sh_no_output_of_prior_pics_flag;
+
+    uint8_t  sh_alf_enabled_flag;
+    uint8_t  sh_num_alf_aps_ids_luma;
+    uint8_t  sh_alf_aps_id_luma[8];
+    uint8_t  sh_alf_cb_enabled_flag;
+    uint8_t  sh_alf_cr_enabled_flag;
+    uint8_t  sh_alf_aps_id_chroma;
+    uint8_t  sh_alf_cc_cb_enabled_flag;
+    uint8_t  sh_alf_cc_cb_aps_id;
+    uint8_t  sh_alf_cc_cr_enabled_flag;
+    uint8_t  sh_alf_cc_cr_aps_id;
+
+    uint8_t  sh_lmcs_used_flag;
+    uint8_t  sh_explicit_scaling_list_used_flag;
+
+    H266RefPicLists sh_ref_pic_lists;
+
+    uint8_t sh_num_ref_idx_active_override_flag;
+    uint8_t sh_num_ref_idx_active_minus1[2];
+    uint8_t sh_cabac_init_flag;
+    uint8_t sh_collocated_from_l0_flag;
+    uint8_t sh_collocated_ref_idx;
+
+    int8_t  sh_qp_delta;
+    int8_t  sh_cb_qp_offset;
+    int8_t  sh_cr_qp_offset;
+    int8_t  sh_joint_cbcr_qp_offset;
+    uint8_t sh_cu_chroma_qp_offset_enabled_flag;
+
+    uint8_t sh_sao_luma_used_flag;
+    uint8_t sh_sao_chroma_used_flag;
+
+    uint8_t sh_deblocking_params_present_flag;
+    uint8_t sh_deblocking_filter_disabled_flag;
+    int8_t  sh_luma_beta_offset_div2;
+    int8_t  sh_luma_tc_offset_div2;
+    int8_t  sh_cb_beta_offset_div2;
+    int8_t  sh_cb_tc_offset_div2;
+    int8_t  sh_cr_beta_offset_div2;
+    int8_t  sh_cr_tc_offset_div2;
+    uint8_t sh_dep_quant_used_flag;
+
+    uint8_t  sh_sign_data_hiding_used_flag;
+    uint8_t  sh_ts_residual_coding_disabled_flag;
+    uint16_t sh_slice_header_extension_length;
+
+    uint8_t  sh_entry_offset_len_minus1;
+    uint32_t sh_entry_point_offset_minus1[H266_MAX_ENTRY_POINT_OFFSETS];
+
+    //calclatecd values;
+    uint16_t num_entry_point_offsets;
+} H266RawSliceHeader;
+
+
+typedef struct H266RawSlice {
+    H266RawSliceHeader header;
+
+    uint8_t     *data;
+    AVBufferRef *data_ref;
+    size_t       data_size;
+    int          data_bit_start;
+} H266RawSlice;
+
+
+typedef struct H266RawSEIBufferingPeriod {
+    uint8_t  bp_seq_parameter_set_id;
+} H266RawSEIBufferingPeriod;
+
+typedef struct H266RawSEIPicTiming {
+} H266RawSEIPicTiming;
+
+typedef struct H266RawSEIPanScanRect {
+} H266RawSEIPanScanRect;
+
+typedef struct H266RawSEIUserDataRegistered {
+
+} H266RawSEIUserDataRegistered;
+
+typedef struct H266RawSEIUserDataUnregistered {
+} H266RawSEIUserDataUnregistered;
+
+typedef struct H266RawSEIRecoveryPoint {
+} H266RawSEIRecoveryPoint;
+
+typedef struct H266RawSEIDisplayOrientation {
+} H266RawSEIDisplayOrientation;
+
+typedef struct H266RawSEIActiveParameterSets {
+} H266RawSEIActiveParameterSets;
+
+typedef struct H266RawSEIDecodedPictureHash {
+} H266RawSEIDecodedPictureHash;
+
+typedef struct H266RawSEITimeCode {
+} H266RawSEITimeCode;
+
+typedef struct H266RawSEIMasteringDisplayColourVolume {
+} H266RawSEIMasteringDisplayColourVolume;
+
+typedef struct H266RawSEIContentLightLevelInfo {
+    uint16_t max_content_light_level;
+    uint16_t max_pic_average_light_level;
+} H266RawSEIContentLightLevelInfo;
+
+typedef struct H266RawSEIAlternativeTransferCharacteristics {
+    uint8_t preferred_transfer_characteristics;
+} H266RawSEIAlternativeTransferCharacteristics;
+
+typedef struct H266RawSEIAlphaChannelInfo {
+    uint8_t  alpha_channel_cancel_flag;
+    uint8_t  alpha_channel_use_idc;
+    uint8_t  alpha_channel_bit_depth_minus8;
+    uint16_t alpha_transparent_value;
+    uint16_t alpha_opaque_value;
+    uint8_t  alpha_channel_incr_flag;
+    uint8_t  alpha_channel_clip_flag;
+    uint8_t  alpha_channel_clip_type_flag;
+} H266RawSEIAlphaChannelInfo;
+
+typedef struct H266RawSEIPayload {
+    uint32_t payload_type;
+    uint32_t payload_size;
+    union {
+        H266RawSEIBufferingPeriod buffering_period;
+        H266RawSEIPicTiming pic_timing;
+        H266RawSEIPanScanRect pan_scan_rect;
+        H266RawSEIUserDataRegistered user_data_registered;
+        H266RawSEIUserDataUnregistered user_data_unregistered;
+        H266RawSEIRecoveryPoint recovery_point;
+        H266RawSEIDisplayOrientation display_orientation;
+        H266RawSEIActiveParameterSets active_parameter_sets;
+        H266RawSEIDecodedPictureHash decoded_picture_hash;
+        H266RawSEITimeCode time_code;
+        H266RawSEIMasteringDisplayColourVolume mastering_display;
+        H266RawSEIContentLightLevelInfo content_light_level;
+        H266RawSEIAlternativeTransferCharacteristics
+            alternative_transfer_characteristics;
+        H266RawSEIAlphaChannelInfo alpha_channel_info;
+        struct {
+            uint8_t     *data;
+            AVBufferRef *data_ref;
+            size_t       data_length;
+        } other;
+    } payload;
+    H266RawExtensionData extension_data;
+} H266RawSEIPayload;
+
+typedef struct H266RawSEI {
+    H266RawNALUnitHeader nal_unit_header;
+
+    H266RawSEIPayload payload[H266_MAX_SEI_PAYLOADS];
+    uint8_t payload_count;
+} H266RawSEI;
+
+typedef struct CodedBitstreamH266Context {
+    // Reader/writer context in common with the H.264 implementation.
+    CodedBitstreamH2645Context common;
+
+    // All currently available parameter sets.  These are updated when
+    // any parameter set NAL unit is read/written with this context.
+    AVBufferRef *vps_ref[H266_MAX_VPS_COUNT];
+    AVBufferRef *sps_ref[H266_MAX_SPS_COUNT];
+    AVBufferRef *pps_ref[H266_MAX_PPS_COUNT];
+    H266RawVPS *vps[H266_MAX_VPS_COUNT];
+    H266RawSPS *sps[H266_MAX_SPS_COUNT];
+    H266RawPPS *pps[H266_MAX_PPS_COUNT];
+    H266RawPH ph;
+
+    // The currently active parameter sets.  These are updated when any
+    // NAL unit refers to the relevant parameter set.  These pointers
+    // must also be present in the arrays above.
+    const H266RawVPS *active_vps;
+    const H266RawSPS *active_sps;
+    const H266RawPPS *active_pps;
+    const H266RawPH *active_ph;
+} CodedBitstreamH266Context;
+
+
+#endif /* AVCODEC_CBS_H266_H */
diff --git a/libavcodec/cbs_h266_syntax_template.c b/libavcodec/cbs_h266_syntax_template.c
new file mode 100644
index 0000000000..19fb1f8c27
--- /dev/null
+++ b/libavcodec/cbs_h266_syntax_template.c
@@ -0,0 +1,1493 @@
+/*
+ * 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
+ */
+
+static int FUNC(rbsp_trailing_bits)(CodedBitstreamContext *ctx, RWContext *rw)
+{
+    int err;
+
+    fixed(1, rbsp_stop_one_bit, 1);
+    while (byte_alignment(rw) != 0)
+        fixed(1, rbsp_alignment_zero_bit, 0);
+    return 0;
+}
+
+static int FUNC(nal_unit_header)(CodedBitstreamContext *ctx, RWContext *rw,
+                                 H266RawNALUnitHeader *current,
+                                 int expected_nal_unit_type)
+{
+    int err;
+
+    fixed(1, forbidden_zero_bit, 0);
+    fixed(1, nuh_reserved_zero_bit, 0);
+
+    u(6, nuh_layer_id,          0, 55);
+
+    if (expected_nal_unit_type >= 0)
+        u(5, nal_unit_type, expected_nal_unit_type,
+                            expected_nal_unit_type);
+    else
+        ub(5, nal_unit_type);
+
+    u(3, nuh_temporal_id_plus1, 1,  7);
+    return 0;
+}
+
+static int FUNC(byte_alignment)(CodedBitstreamContext *ctx, RWContext *rw)
+{
+    int err;
+
+    fixed(1, alignment_bit_equal_to_one, 1);
+    while (byte_alignment(rw) != 0)
+        fixed(1, alignment_bit_equal_to_zero, 0);
+    return 0;
+}
+
+static int FUNC(general_constraints_info)(CodedBitstreamContext *ctx, RWContext *rw,
+                                    H266GeneralConstraintsInfo *current)
+{
+    int err;
+
+    flag(gci_present_flag);
+    if (current->gci_present_flag) {
+        return AVERROR_PATCHWELCOME;
+    }
+    while (byte_alignment(rw))
+        fixed(1, bit_equal_to_zero, 0);
+    return 0;
+}
+
+static int FUNC(profile_tier_level)(CodedBitstreamContext *ctx, RWContext *rw,
+                                    H266RawProfileTierLevel *current,
+                                    int profile_tire_present_flag,
+                                    int max_num_sub_layers_minus1)
+{
+    int err, i;
+
+    if (profile_tire_present_flag) {
+        ub(7, general_profile_idc);
+        flag(general_tier_flag);
+    }
+    ub(8, general_level_idc);
+    flag(ptl_frame_only_constraint_flag);
+    flag(ptl_multilayer_enabled_flag);
+    if (profile_tire_present_flag) {
+        CHECK(FUNC(general_constraints_info)(ctx, rw, &current->general_constraints_info));
+    }
+    for( i = max_num_sub_layers_minus1 - 1; i >= 0; i--)
+        flags(ptl_sublayer_level_present_flag[i], 1, i);
+    while (byte_alignment(rw))
+        fixed(1, ptl_reserved_zero_bit, 0);
+    for( i = max_num_sub_layers_minus1 - 1; i >= 0; i-- )
+        if(current->ptl_sublayer_level_present_flag[i])
+            ubs(8, sublayer_level_idc[i], 1, i);
+    if (profile_tire_present_flag) {
+        ub(8, ptl_num_sub_profiles);
+        for( i = 0; i < current->ptl_num_sub_profiles; i++ )
+            ubs(32, general_sub_profile_idc[i], 1, i);
+    }
+    return 0;
+}
+
+static int FUNC(vui_parameters)(CodedBitstreamContext *ctx, RWContext *rw,
+                                H266RawVUI *current)
+{
+    int err;
+
+    flag(vui_progressive_source_flag);
+    flag(vui_interlaced_source_flag);
+    flag(vui_non_packed_constraint_flag);
+    flag(vui_non_projected_constraint_flag);
+    flag(vui_aspect_ratio_info_present_flag);
+    if(current->vui_aspect_ratio_info_present_flag ) {
+        flag(vui_aspect_ratio_constant_flag);
+        ub(8, vui_aspect_ratio_idc);
+        if(current->vui_aspect_ratio_idc == 255 ) {
+            ub(16, vui_sar_width);
+            ub(16, vui_sar_height);
+        }
+    } else {
+        infer(vui_aspect_ratio_constant_flag, 0);
+        infer(vui_aspect_ratio_idc, 0);
+
+    }
+    flag(vui_overscan_info_present_flag);
+    if (current->vui_overscan_info_present_flag)
+        flag(vui_overscan_appropriate_flag);
+    flag(vui_colour_description_present_flag);
+    if(current->vui_colour_description_present_flag ) {
+        ub(8, vui_colour_primaries);
+        ub(8, vui_transfer_characteristics);
+        ub(8, vui_matrix_coeffs);
+        flag(vui_full_range_flag);
+    } else {
+        infer(vui_colour_primaries, 2);
+        infer(vui_transfer_characteristics, 2);
+        infer(vui_matrix_coeffs, 2);
+        infer(vui_full_range_flag, 0);
+    }
+    flag(vui_chroma_loc_info_present_flag);
+    if(current->vui_chroma_loc_info_present_flag ) {
+        if(current->vui_progressive_source_flag && !current->vui_interlaced_source_flag) {
+            ue(vui_chroma_sample_loc_type_frame, 0, 6);
+        }
+        else {
+            ue(vui_chroma_sample_loc_type_top_field, 0, 6);
+            ue(vui_chroma_sample_loc_type_bottom_field,  0, 6);
+        }
+    }
+
+    return 0;
+}
+
+static int FUNC(vui_payload)(CodedBitstreamContext *ctx, RWContext *rw,
+                                H266RawVUI *current, uint16_t vui_payload_size)
+{
+    int err;
+
+#ifdef READ
+    int start_pos, end_pos, left;
+
+    start_pos = get_bits_count(rw);
+    CHECK(FUNC(vui_parameters)(ctx, rw, current));
+    end_pos = get_bits_count(rw);
+
+    left = vui_payload_size * 8 - (end_pos - start_pos);
+    skip_bits(rw, left);
+#else
+    return AVERROR_PATCHWELCOME;
+#endif
+
+
+    return 0;
+}
+
+static int FUNC(vps)(CodedBitstreamContext *ctx, RWContext *rw,
+                     H266RawVPS *current)
+{
+    HEADER("Video Parameter Set");
+    av_log(ctx->log_ctx, AV_LOG_ERROR, "vps is not supported yet\n");
+
+    return AVERROR_PATCHWELCOME;
+}
+
+static int FUNC(dpb_parameters)(CodedBitstreamContext *ctx, RWContext *rw,
+                     H266DpbParameters *current, uint8_t max_sublayers_minus1, uint8_t sublayer_info_flag)
+{
+    int err, i;
+    for(i = ( sublayer_info_flag ? 0 : max_sublayers_minus1 ); i <= max_sublayers_minus1; i++ ) {
+        ues(dpb_max_dec_pic_buffering_minus1[i], 0, H266_MAX_DPB_SIZE - 1, 1, i);
+        ues(dpb_max_num_reorder_pics[i], 0, current->dpb_max_dec_pic_buffering_minus1[i], 1, i);
+        ues(dpb_max_latency_increase_plus1[i],  0, UINT32_MAX - 1, 1, i);
+    }
+    return 0;
+}
+
+static int FUNC(ref_pic_list_struct)(CodedBitstreamContext *ctx, RWContext *rw,
+                     H266RefPicListStruct *current, uint8_t list_idx, uint8_t rpls_idx,
+                     const H266RawSPS* const sps)
+{
+
+    int err, i, j;
+    ue(num_ref_entries, 0, H266_MAX_DPB_SIZE + 13);
+    if(sps->sps_long_term_ref_pics_flag && rpls_idx < sps->sps_num_ref_pic_lists[list_idx] && current->num_ref_entries > 0)
+        flag(ltrp_in_header_flag);
+    if (sps->sps_long_term_ref_pics_flag && rpls_idx == sps->sps_num_ref_pic_lists[list_idx])
+        infer(ltrp_in_header_flag, 1);
+    current->num_ltrp_entries = 0;
+    for( i = 0, j = 0; i < current->num_ref_entries; i++) {
+        if(sps->sps_inter_layer_prediction_enabled_flag )
+            flags(inter_layer_ref_pic_flag[i], 1, i);
+        else
+            infer(inter_layer_ref_pic_flag[i], 0);
+
+        if(!current->inter_layer_ref_pic_flag[i] ) {
+            if(sps->sps_long_term_ref_pics_flag )
+                flags(st_ref_pic_flag[i],  1, i);
+            else
+                infer(st_ref_pic_flag[i], 1);
+            if(current->st_ref_pic_flag[i]) {
+                int abs_delta_poc_st;
+                ues(abs_delta_poc_st[i], 0, MAX_UINT_BITS(15), 1, i);
+                if( (sps->sps_weighted_pred_flag || sps->sps_weighted_bipred_flag ) && i != 0 )
+                    abs_delta_poc_st = current->abs_delta_poc_st[i];
+                else
+                    abs_delta_poc_st = current->abs_delta_poc_st[i] + 1;
+                if (abs_delta_poc_st > 0)
+                    flags(strp_entry_sign_flag[i], 1, i);
+            } else {
+                if(!current->ltrp_in_header_flag) {
+                    ubs(sps->sps_log2_max_pic_order_cnt_lsb_minus4 + 4, rpls_poc_lsb_lt[j], 1, j);
+                    j++;
+                }
+                current->num_ltrp_entries++;
+            }
+        } else {
+            //todo: check range when vps parser is ready.
+            ues(ilrp_idx[i], 0, MAX_UINT_BITS(8), 1, i);
+        }
+
+    }
+    return 0;
+}
+
+static int FUNC(ref_pic_lists)(CodedBitstreamContext *ctx, RWContext *rw,
+                H266RefPicLists *current)
+{
+    CodedBitstreamH266Context *h266 = ctx->priv_data;
+    const H266RawSPS *sps = h266->active_sps;
+    const H266RawPPS *pps = h266->active_pps;
+    const H266RefPicListStruct* ref_list;
+    int err, i, j;
+    for (i = 0; i < 2; i++) {
+        if (sps->sps_num_ref_pic_lists[i] > 0 && (i == 0 || (i == 1 && pps->pps_rpl1_idx_present_flag))) {
+            flags(rpl_sps_flag[i], 1, i);
+        } else {
+            if (!sps->sps_num_ref_pic_lists[i]) {
+                infer(rpl_sps_flag[i], 0);
+            } else {
+                if (!pps->pps_rpl1_idx_present_flag && i == 1)
+                    infer(rpl_sps_flag[1], current->rpl_sps_flag[0]);
+            }
+        }
+        if (current->rpl_sps_flag[i]) {
+            if(sps->sps_num_ref_pic_lists[i] > 1 && (i == 0 || ( i == 1 && pps->pps_rpl1_idx_present_flag))) {
+                us(ceil(log2(sps->sps_num_ref_pic_lists[i])), rpl_idx[i], 0, sps->sps_num_ref_pic_lists[i] - 1, 1, i);
+            } else if (sps->sps_num_ref_pic_lists[i] == 1) {
+                infer(rpl_idx[i], 0);
+            } else if (i == 1 && !pps->pps_rpl1_idx_present_flag){
+                infer(rpl_idx[1], current->rpl_idx[0]);
+            } else {
+                //how to handle this? or never happpend?
+                av_log(ctx->log_ctx, AV_LOG_ERROR, "can't infer the rpl_idx[i]\n");
+                return AVERROR_PATCHWELCOME;
+            }
+            memcpy(&current->rpl_ref_list[i], &sps->sps_ref_pic_list_struct[i][current->rpl_idx[i]], sizeof(current->rpl_ref_list[i]));
+        } else {
+            CHECK(FUNC(ref_pic_list_struct)(ctx, rw, &current->rpl_ref_list[i], i, sps->sps_num_ref_pic_lists[i], sps));
+        }
+        ref_list = &current->rpl_ref_list[i];
+
+        for( j = 0; j < ref_list->num_ltrp_entries; j++ ) {
+            if(ref_list->ltrp_in_header_flag)
+                ubs(sps->sps_log2_max_pic_order_cnt_lsb_minus4 + 4, poc_lsb_lt[i][j], 2, i, j);
+            flags(delta_poc_msb_cycle_present_flag[i][j], 2, i, j);
+            if(current->delta_poc_msb_cycle_present_flag[i][j])
+                ues(delta_poc_msb_cycle_lt[i][j], 0, MAX_UINT_BITS(32 - sps->sps_log2_max_pic_order_cnt_lsb_minus4 - 4), 2, i, j);
+        }
+    }
+    return 0;
+
+}
+
+static int FUNC(general_timing_hrd_parameters)(CodedBitstreamContext *ctx, RWContext *rw,
+                     H266RawGeneralTimingHrdParameters *current)
+{
+    int err;
+    ub(32, num_units_in_tick);
+    u(32, time_scale, 1, MAX_UINT_BITS(32));
+    flag(general_nal_hrd_params_present_flag);
+    flag(general_vcl_hrd_params_present_flag);
+
+    if(current->general_nal_hrd_params_present_flag || current->general_vcl_hrd_params_present_flag ) {
+        flag(general_same_pic_timing_in_all_ols_flag);
+        flag(general_du_hrd_params_present_flag);
+        if(current->general_du_hrd_params_present_flag)
+            ub(8, tick_divisor_minus2);
+        ub(4, bit_rate_scale);
+        ub(4, cpb_size_scale);
+        if(current->general_du_hrd_params_present_flag)
+            ub(4, cpb_size_du_scale);
+        ue(hrd_cpb_cnt_minus1, 0, 31);
+    } else {
+        //infer general_same_pic_timing_in_all_ols_flag?
+        infer(general_du_hrd_params_present_flag, 0);
+    }
+    return 0;
+}
+
+static int FUNC(sublayer_hrd_parameters)(CodedBitstreamContext *ctx, RWContext *rw,
+                     H266RawSubLayerHRDParameters* current, int sublayer_id, const H266RawGeneralTimingHrdParameters* const general)
+{
+    int err, i;
+    for (i = 0; i <= general->hrd_cpb_cnt_minus1; i++) {
+        ues(bit_rate_value_minus1[i], 0, UINT32_MAX - 1, 2, sublayer_id, i);
+        ues(cpb_size_value_minus1[i], 0, UINT32_MAX - 1, 2, sublayer_id, i);
+        if (general->general_du_hrd_params_present_flag) {
+            ues(cpb_size_du_value_minus1[i], 0, UINT32_MAX - 1, 2, sublayer_id, i);
+            ues(bit_rate_du_value_minus1[i], 0, UINT32_MAX - 1, 2, sublayer_id, i);
+        }
+        flags(cbr_flag[i], 2, sublayer_id, i);
+    }
+    return 0;
+}
+
+static int FUNC(ols_timing_hrd_parameters)(CodedBitstreamContext *ctx, RWContext *rw,
+                     H266RawOlsTimingHrdParameters* current, uint8_t first_sublayer, uint8_t max_sublayers_minus1, const H266RawGeneralTimingHrdParameters * general)
+{
+    int err, i;
+    for( i = first_sublayer; i <= max_sublayers_minus1; i++ ) {
+        flags(fixed_pic_rate_general_flag[i], 1, i);
+        if (!current->fixed_pic_rate_general_flag[i])
+            flags(fixed_pic_rate_within_cvs_flag[i], 1, i);
+        else
+            infer(fixed_pic_rate_within_cvs_flag[i], 1);
+        if(current->fixed_pic_rate_within_cvs_flag[i]) {
+            ues(elemental_duration_in_tc_minus1[i], 0, 2047, 1, i);
+            infer(low_delay_hrd_flag[i], 0);
+        } else if((general->general_nal_hrd_params_present_flag || general->general_vcl_hrd_params_present_flag)
+            && general->hrd_cpb_cnt_minus1 == 0 ) {
+            flags(low_delay_hrd_flag[i], 1, i);
+        } else {
+            infer(low_delay_hrd_flag[i], 0);
+        }
+        if(general->general_nal_hrd_params_present_flag)
+            CHECK(FUNC(sublayer_hrd_parameters)(ctx, rw, &current->nal_sub_layer_hrd_parameters[i], i, general));
+        if(general->general_vcl_hrd_params_present_flag)
+            CHECK(FUNC(sublayer_hrd_parameters)(ctx, rw, &current->nal_sub_layer_hrd_parameters[i], i, general));
+    }
+    return 0;
+}
+
+static uint8_t get_extra_bits(const uint8_t* present_flags, uint8_t extra_bytes)
+{
+    uint8_t num_extra_bits = 0;
+    int i;
+    for (i = 0; i < extra_bytes * 8; i++) {
+        if (present_flags[i])
+            num_extra_bits++;
+    }
+    return num_extra_bits;
+}
+
+static int FUNC(sps)(CodedBitstreamContext *ctx, RWContext *rw,
+                     H266RawSPS *current)
+{
+    CodedBitstreamH266Context *h266 = ctx->priv_data;
+    const H266RawVPS *vps;
+    int err, i, j;
+    unsigned int ctb_log2_size_y, min_cb_log2_size_y,
+                 min_qt_log2_size_intra_y, min_qt_log2_size_inter_y,
+                 ctb_size_y, max_num_merge_cand;
+
+    HEADER("Sequence Parameter Set");
+
+    CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header, H266_NAL_SPS));
+
+    ub(4, sps_seq_parameter_set_id);
+    ub(4, sps_video_parameter_set_id);
+    h266->active_vps = vps = h266->vps[current->sps_video_parameter_set_id];
+
+    u(3, sps_max_sublayers_minus1, 0, H266_MAX_SUB_LAYERS - 1);
+    u(2, sps_chroma_format_idc, 0, 3);
+    u(2, sps_log2_ctu_size_minus5, 0, 3);
+    ctb_log2_size_y = current->sps_log2_ctu_size_minus5 + 5;
+    ctb_size_y = 1 << ctb_log2_size_y;
+
+    flag(sps_ptl_dpb_hrd_params_present_flag);
+    if (current->sps_ptl_dpb_hrd_params_present_flag) {
+        CHECK(FUNC(profile_tier_level)(ctx, rw, &current->profile_tier_level,
+                                    1, current->sps_max_sublayers_minus1));
+    }
+    flag(sps_gdr_enabled_flag);
+    flag(sps_ref_pic_resampling_enabled_flag);
+    if(current->sps_ref_pic_resampling_enabled_flag)
+        flag(sps_res_change_in_clvs_allowed_flag);
+    else
+        infer(sps_res_change_in_clvs_allowed_flag, 0);
+
+    ue(sps_pic_width_max_in_luma_samples,  1, H266_MAX_WIDTH);
+    ue(sps_pic_height_max_in_luma_samples, 1, H266_MAX_HEIGHT);
+
+    flag(sps_conformance_window_flag);
+    if (current->sps_conformance_window_flag) {
+        ue(sps_conf_win_left_offset,    0, current->sps_pic_width_max_in_luma_samples);
+        ue(sps_conf_win_right_offset,   0, current->sps_pic_width_max_in_luma_samples);
+        ue(sps_conf_win_top_offset,     0, current->sps_pic_height_max_in_luma_samples);
+        ue(sps_conf_win_bottom_offset,   0, current->sps_pic_height_max_in_luma_samples);
+    } else {
+        infer(sps_conf_win_left_offset,     0);
+        infer(sps_conf_win_right_offset,    0);
+        infer(sps_conf_win_top_offset,      0);
+        infer(sps_conf_win_bottom_offset,    0);
+    }
+    flag(sps_subpic_info_present_flag);
+    if (current->sps_subpic_info_present_flag) {
+        av_log(ctx->log_ctx, AV_LOG_ERROR, "subpic is not supported yet\n");
+        return AVERROR_PATCHWELCOME;
+    } else {
+        infer(sps_num_subpics_minus1, 0);
+        infer(sps_independent_subpics_flag, 1);
+        infer(sps_subpic_same_size_flag, 0);
+        //?sps_subpic_id_len_minus1;
+        infer(sps_subpic_id_mapping_explicitly_signalled_flag, 0);
+
+    }
+
+    ue(sps_bitdepth_minus8,   0, 2);
+    current->qp_bd_offset = 6 * current->sps_bitdepth_minus8;
+
+    flag(sps_entropy_coding_sync_enabled_flag);
+    flag(sps_entry_point_offsets_present_flag);
+
+    u(4, sps_log2_max_pic_order_cnt_lsb_minus4, 0, 12);
+    flag(sps_poc_msb_cycle_flag);
+    if (current->sps_poc_msb_cycle_flag)
+        ue(sps_poc_msb_cycle_len_minus1, 0, 32 - current->sps_log2_max_pic_order_cnt_lsb_minus4 - 5);
+
+    u(2, sps_num_extra_ph_bytes, 0, 2);
+    for (i = 0; i < (current->sps_num_extra_ph_bytes * 8 ); i++) {
+        flags(sps_extra_ph_bit_present_flag[i], 1, i);
+    }
+    current->num_extra_ph_bits = get_extra_bits(current->sps_extra_ph_bit_present_flag, current->sps_num_extra_ph_bytes);
+
+    u(2, sps_num_extra_sh_bytes, 0, 0);
+    for (i = 0; i < (current->sps_num_extra_sh_bytes * 8 ); i++) {
+        flags(sps_extra_sh_bit_present_flag[i], 1, i);
+    }
+    current->num_extra_sh_bits = get_extra_bits(current->sps_extra_sh_bit_present_flag, current->sps_num_extra_sh_bytes);
+
+    if (current->sps_ptl_dpb_hrd_params_present_flag) {
+        if (current->sps_max_sublayers_minus1 > 0)
+            flag(sps_sublayer_dpb_params_flag);
+        else
+            infer(sps_sublayer_dpb_params_flag, 0);
+        CHECK(FUNC(dpb_parameters)(ctx, rw, &current->sps_dpb_params, current->sps_max_sublayers_minus1,
+                                current->sps_sublayer_dpb_params_flag));
+    }
+
+    ue(sps_log2_min_luma_coding_block_size_minus2, 0, FFMIN(4, current->sps_log2_ctu_size_minus5 + 3));
+    min_cb_log2_size_y = current->min_cb_log2_size_y = current->sps_log2_min_luma_coding_block_size_minus2 + 2;
+
+    flag(sps_partition_constraints_override_enabled_flag);
+
+    ue(sps_log2_diff_min_qt_min_cb_intra_slice_luma, 0, FFMIN(6, ctb_log2_size_y) - min_cb_log2_size_y);
+    min_qt_log2_size_intra_y = current->sps_log2_diff_min_qt_min_cb_intra_slice_luma + min_cb_log2_size_y;
+
+    ue(sps_max_mtt_hierarchy_depth_intra_slice_luma, 0, 2 * (ctb_log2_size_y - min_cb_log2_size_y));
+
+    if (current->sps_max_mtt_hierarchy_depth_intra_slice_luma) {
+        ue(sps_log2_diff_max_bt_min_qt_intra_slice_luma, 0, ctb_log2_size_y - min_qt_log2_size_intra_y);
+        ue(sps_log2_diff_max_tt_min_qt_intra_slice_luma, 0, FFMIN(6, ctb_log2_size_y) - min_qt_log2_size_intra_y);
+    } else {
+        infer(sps_log2_diff_max_bt_min_qt_intra_slice_luma, 0);
+        infer(sps_log2_diff_max_tt_min_qt_intra_slice_luma, 0);
+    }
+
+    if (current->sps_chroma_format_idc) {
+        flag(sps_qtbtt_dual_tree_intra_flag);
+    } else {
+        infer(sps_qtbtt_dual_tree_intra_flag, 0);
+    }
+
+    if(current->sps_qtbtt_dual_tree_intra_flag) {
+        ue(sps_log2_diff_min_qt_min_cb_intra_slice_chroma, 0, FFMIN(6, ctb_log2_size_y) - min_cb_log2_size_y);
+        ue(sps_max_mtt_hierarchy_depth_intra_slice_chroma, 0, 2 * (ctb_log2_size_y - min_cb_log2_size_y));
+        if(current->sps_max_mtt_hierarchy_depth_intra_slice_chroma) {
+            unsigned int min_qt_log2_size_intra_c = current->sps_log2_diff_min_qt_min_cb_intra_slice_chroma + min_cb_log2_size_y;
+            ue(sps_log2_diff_max_bt_min_qt_intra_slice_chroma, 0, FFMIN(6, ctb_log2_size_y) - min_qt_log2_size_intra_c);
+            ue(sps_log2_diff_max_tt_min_qt_intra_slice_chroma, 0, FFMIN(6, ctb_log2_size_y) - min_qt_log2_size_intra_c);
+        }
+    } else {
+        infer(sps_log2_diff_min_qt_min_cb_intra_slice_chroma, 0);
+        infer(sps_max_mtt_hierarchy_depth_intra_slice_chroma, 0);
+    }
+    if (!current->sps_max_mtt_hierarchy_depth_intra_slice_chroma) {
+        infer(sps_log2_diff_max_bt_min_qt_intra_slice_chroma, 0);
+        infer(sps_log2_diff_max_tt_min_qt_intra_slice_chroma, 0);
+    }
+
+    ue(sps_log2_diff_min_qt_min_cb_inter_slice, 0, FFMIN(6, ctb_log2_size_y) - min_cb_log2_size_y);
+    min_qt_log2_size_inter_y = current->sps_log2_diff_min_qt_min_cb_inter_slice + min_cb_log2_size_y;
+
+    ue(sps_max_mtt_hierarchy_depth_inter_slice, 0, 2 * (ctb_log2_size_y - min_cb_log2_size_y));
+    if(current->sps_max_mtt_hierarchy_depth_inter_slice) {
+        ue(sps_log2_diff_max_bt_min_qt_inter_slice, 0, ctb_log2_size_y - min_qt_log2_size_inter_y);
+        ue(sps_log2_diff_max_tt_min_qt_inter_slice, 0, FFMIN(6, ctb_log2_size_y) - min_qt_log2_size_inter_y);
+    } else {
+        infer(sps_log2_diff_max_bt_min_qt_inter_slice, 0);
+        infer(sps_log2_diff_max_tt_min_qt_inter_slice, 0);
+    }
+
+    if (ctb_size_y > 32)
+        flag(sps_max_luma_transform_size_64_flag);
+    else
+        infer(sps_max_luma_transform_size_64_flag, 0);
+
+    flag(sps_transform_skip_enabled_flag);
+    if (current->sps_transform_skip_enabled_flag) {
+        ue(sps_log2_transform_skip_max_size_minus2, 0, 3);
+        flag(sps_bdpcm_enabled_flag);
+    }
+
+    flag(sps_mts_enabled_flag);
+    if (current->sps_mts_enabled_flag) {
+        flag(sps_explicit_mts_intra_enabled_flag);
+        flag(sps_explicit_mts_inter_enabled_flag);
+    } else {
+        infer(sps_explicit_mts_intra_enabled_flag, 0);
+        infer(sps_explicit_mts_inter_enabled_flag, 0);
+    }
+
+    flag(sps_lfnst_enabled_flag);
+
+    if (current->sps_chroma_format_idc) {
+        uint8_t num_qp_tables;
+        flag(sps_joint_cbcr_enabled_flag);
+        flag(sps_same_qp_table_for_chroma_flag);
+        num_qp_tables = current->sps_same_qp_table_for_chroma_flag ? 1 : ( current->sps_joint_cbcr_enabled_flag ? 3 : 2 );
+        for( i = 0; i < num_qp_tables; i++ ) {
+            ses(sps_qp_table_start_minus26[i], -26 - current->qp_bd_offset, 36, 1, i);
+            ues(sps_num_points_in_qp_table_minus1[i], 0, 36 - current->sps_qp_table_start_minus26[i], 1, i);
+            for( j = 0; j <= current->sps_num_points_in_qp_table_minus1[ i ]; j++ ) {
+                ues(sps_delta_qp_in_val_minus1[i][j], 0, MAX_UINT_BITS(8), 2, i, j);
+                ues(sps_delta_qp_diff_val[i][j], 0, MAX_UINT_BITS(8), 2, i, j);
+            }
+        }
+    } else {
+        infer(sps_joint_cbcr_enabled_flag, 0);
+        infer(sps_same_qp_table_for_chroma_flag, 0);
+    }
+
+    flag(sps_sao_enabled_flag);
+    flag(sps_alf_enabled_flag);
+    if(current->sps_alf_enabled_flag && current->sps_chroma_format_idc)
+        flag(sps_ccalf_enabled_flag);
+    else
+        infer(sps_ccalf_enabled_flag, 0);
+    flag(sps_lmcs_enabled_flag);
+    flag(sps_weighted_pred_flag);
+    flag(sps_weighted_bipred_flag);
+    flag(sps_long_term_ref_pics_flag);
+    if(current->sps_video_parameter_set_id > 0)
+        flag(sps_inter_layer_prediction_enabled_flag);
+    else
+        infer(sps_inter_layer_prediction_enabled_flag, 0);
+    flag(sps_idr_rpl_present_flag);
+    flag(sps_rpl1_same_as_rpl0_flag);
+
+    for (i = 0; i < (current->sps_rpl1_same_as_rpl0_flag ? 1 : 2); i++) {
+        ues(sps_num_ref_pic_lists[i], 0, H266_MAX_REF_PIC_LISTS, 1, i);
+        for( j = 0; j < current->sps_num_ref_pic_lists[i]; j++)
+            CHECK(FUNC(ref_pic_list_struct)(ctx, rw, &current->sps_ref_pic_list_struct[i][j], i, j, current));
+    }
+
+    flag(sps_ref_wraparound_enabled_flag);
+
+    flag(sps_temporal_mvp_enabled_flag);
+    if(current->sps_temporal_mvp_enabled_flag )
+        flag(sps_sbtmvp_enabled_flag);
+    else
+        infer(sps_sbtmvp_enabled_flag, 0);
+
+    flag(sps_amvr_enabled_flag);
+    flag(sps_bdof_enabled_flag);
+    if(current->sps_bdof_enabled_flag)
+        flag(sps_bdof_control_present_in_ph_flag);
+    else
+        infer(sps_bdof_control_present_in_ph_flag, 0);
+
+    flag(sps_smvd_enabled_flag);
+    flag(sps_dmvr_enabled_flag);
+    if(current->sps_dmvr_enabled_flag)
+        flag(sps_dmvr_control_present_in_ph_flag);
+    else
+        infer(sps_dmvr_control_present_in_ph_flag, 0);
+
+    flag(sps_mmvd_enabled_flag);
+    if(current->sps_mmvd_enabled_flag)
+        flag(sps_mmvd_fullpel_only_enabled_flag);
+    else
+        infer(sps_mmvd_fullpel_only_enabled_flag, 0);
+
+    ue(sps_six_minus_max_num_merge_cand, 0, 5);
+    max_num_merge_cand = 6 - current->sps_six_minus_max_num_merge_cand;
+
+    flag(sps_sbt_enabled_flag);
+
+    flag(sps_affine_enabled_flag);
+    if(current->sps_affine_enabled_flag ) {
+        ue(sps_five_minus_max_num_subblock_merge_cand, 0, 5 - current->sps_sbtmvp_enabled_flag);
+        flag(sps_6param_affine_enabled_flag);
+        if(current->sps_amvr_enabled_flag)
+            flag(sps_affine_amvr_enabled_flag);
+        else
+            infer(sps_affine_amvr_enabled_flag, 0);
+        flag(sps_affine_prof_enabled_flag);
+        if(current->sps_affine_prof_enabled_flag)
+            flag(sps_prof_control_present_in_ph_flag);
+        else
+            infer(sps_prof_control_present_in_ph_flag, 0);
+    } else {
+        infer(sps_five_minus_max_num_subblock_merge_cand, 0);
+        infer(sps_6param_affine_enabled_flag, 0);
+        infer(sps_affine_amvr_enabled_flag, 0);
+        infer(sps_affine_prof_enabled_flag, 0);
+        infer(sps_prof_control_present_in_ph_flag, 0);
+    }
+
+    flag(sps_bcw_enabled_flag);
+    flag(sps_ciip_enabled_flag);
+
+    if (max_num_merge_cand >= 2) {
+        flag(sps_gpm_enabled_flag);
+        if (current->sps_gpm_enabled_flag && max_num_merge_cand >= 3)
+            ue(sps_max_num_merge_cand_minus_max_num_gpm_cand,  0, max_num_merge_cand - 2);
+    } else {
+        infer(sps_gpm_enabled_flag, 0);
+    }
+
+    ue(sps_log2_parallel_merge_level_minus2, 0, ctb_log2_size_y - 2);
+
+    flag(sps_isp_enabled_flag);
+    flag(sps_mrl_enabled_flag);
+    flag(sps_mip_enabled_flag);
+
+    if(current->sps_chroma_format_idc)
+        flag(sps_cclm_enabled_flag);
+    else
+        infer(sps_cclm_enabled_flag, 0);
+    if(current->sps_chroma_format_idc == 1 ) {
+        flag(sps_chroma_horizontal_collocated_flag);
+        flag(sps_chroma_vertical_collocated_flag);
+    } else {
+        infer(sps_chroma_horizontal_collocated_flag, 1);
+        infer(sps_chroma_vertical_collocated_flag, 1);
+    }
+
+    flag(sps_palette_enabled_flag);
+    if(current->sps_chroma_format_idc == 3 && !current->sps_max_luma_transform_size_64_flag)
+        flag(sps_act_enabled_flag);
+    else
+        infer(sps_act_enabled_flag, 0);
+    if(current->sps_transform_skip_enabled_flag || current->sps_palette_enabled_flag)
+        ue(sps_min_qp_prime_ts, 0, 8);
+
+    flag(sps_ibc_enabled_flag);
+    if (current->sps_ibc_enabled_flag) {
+        ue(sps_six_minus_max_num_ibc_merge_cand, 0, 5);
+    }
+
+    flag(sps_ladf_enabled_flag);
+    if (current->sps_ladf_enabled_flag) {
+        ub(2, sps_num_ladf_intervals_minus2);
+        se(sps_ladf_lowest_interval_qp_offset, -63, 63);
+        for( i = 0; i < current->sps_num_ladf_intervals_minus2 + 1; i++ ) {
+            ses(sps_ladf_qp_offset[i], -63, 63, 1, i);
+            ues(sps_ladf_delta_threshold_minus1[i], 0, (2 << ( 8 + current->sps_bitdepth_minus8)) - 3, 1, i);
+        }
+    }
+
+    flag(sps_explicit_scaling_list_enabled_flag);
+    if(current->sps_lfnst_enabled_flag && current->sps_explicit_scaling_list_enabled_flag)
+        flag(sps_scaling_matrix_for_lfnst_disabled_flag);
+
+    if(current->sps_act_enabled_flag && current->sps_explicit_scaling_list_enabled_flag)
+        flag(sps_scaling_matrix_for_alternative_colour_space_disabled_flag);
+    else
+        infer(sps_scaling_matrix_for_alternative_colour_space_disabled_flag, 0);
+    if(current->sps_scaling_matrix_for_alternative_colour_space_disabled_flag)
+        flag(sps_scaling_matrix_designated_colour_space_flag);
+
+    flag(sps_dep_quant_enabled_flag);
+    flag(sps_sign_data_hiding_enabled_flag);
+
+    flag(sps_virtual_boundaries_enabled_flag);
+    if(current->sps_virtual_boundaries_enabled_flag) {
+        flag(sps_virtual_boundaries_present_flag);
+        if(current->sps_virtual_boundaries_present_flag) {
+            ue(sps_num_ver_virtual_boundaries, 0, current->sps_pic_width_max_in_luma_samples <= 8 ? 0 : 3);
+            for( i = 0; i < current->sps_num_ver_virtual_boundaries; i++ )
+                ues(sps_virtual_boundary_pos_x_minus1[i], 0, (current->sps_pic_width_max_in_luma_samples + 7) / 8 - 2, 1, i);
+            ue(sps_num_hor_virtual_boundaries, 0, current->sps_pic_height_max_in_luma_samples <= 8 ? 0 : 3);
+            for( i = 0; i < current->sps_num_hor_virtual_boundaries; i++ )
+                ues(sps_virtual_boundary_pos_y_minus1[i], 0, (current->sps_pic_height_max_in_luma_samples + 7) / 8 - 2, 1, i);
+        }
+    } else {
+        infer(sps_virtual_boundaries_present_flag, 0);
+        infer(sps_num_ver_virtual_boundaries, 0);
+        infer(sps_num_hor_virtual_boundaries, 0);
+    }
+
+    if(current->sps_ptl_dpb_hrd_params_present_flag) {
+        flag(sps_timing_hrd_params_present_flag);
+        if (current->sps_timing_hrd_params_present_flag) {
+            uint8_t first_sublayer;
+            CHECK(FUNC(general_timing_hrd_parameters)(ctx, rw, &current->sps_general_timing_hrd_parameters));
+            if(current->sps_max_sublayers_minus1 > 0)
+                flag(sps_sublayer_cpb_params_present_flag);
+            else
+                infer(sps_sublayer_cpb_params_present_flag, 0);
+            first_sublayer = current->sps_sublayer_cpb_params_present_flag ? 0 : current->sps_max_sublayers_minus1;
+            CHECK(FUNC(ols_timing_hrd_parameters)(ctx, rw, &current->sps_ols_timing_hrd_parameters, first_sublayer, current->sps_max_sublayers_minus1, &current->sps_general_timing_hrd_parameters));
+        }
+    }
+
+    flag(sps_field_seq_flag);
+    flag(sps_vui_parameters_present_flag);
+    if (current->sps_vui_parameters_present_flag) {
+        ue(sps_vui_payload_size_minus1, 0, 1023);
+        while (!byte_alignment(rw))
+            fixed(1, sps_vui_alignment_zero_bit, 0);
+        CHECK(FUNC(vui_payload)(ctx, rw, &current->vui, current->sps_vui_payload_size_minus1 + 1));
+    }
+
+    flag(sps_extension_flag);
+    if (current->sps_extension_flag) {
+        return AVERROR_PATCHWELCOME;
+    }
+    CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
+
+    return 0;
+}
+
+static const uint8_t h266_sub_width_c[] = {
+    1, 2, 2, 1
+};
+
+static const uint8_t h266_sub_height_c[] = {
+    1, 2, 1, 1
+};
+
+static int get_num_tile(const uint16_t* pps_tile_size_minus1, uint16_t num_exp_tile_minus1, unsigned int pic_size_in_ctbs_y, unsigned int exp_tile_size)
+{
+    uint16_t uniform_size = pps_tile_size_minus1[num_exp_tile_minus1] + 1;
+    unsigned int left = pic_size_in_ctbs_y - exp_tile_size;
+    return num_exp_tile_minus1 + 1 + (left + uniform_size - 1) / uniform_size;
+}
+
+static int FUNC(pps)(CodedBitstreamContext *ctx, RWContext *rw,
+                     H266RawPPS *current)
+{
+
+    CodedBitstreamH266Context *h266 = ctx->priv_data;
+    const H266RawSPS *sps;
+    int err, i;
+    unsigned int min_cb_size_y, divisor, ctb_size_y,
+            pic_width_in_ctbs_y, pic_height_in_ctbs_y;
+    uint8_t sub_width_c, sub_height_c;
+
+    HEADER("Picture Parameter Set");
+
+    CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header, H266_NAL_PPS));
+
+    ub(6, pps_pic_parameter_set_id);
+    ub(4, pps_seq_parameter_set_id);
+    sps = h266->sps[current->pps_seq_parameter_set_id];
+    if (!sps) {
+        av_log(ctx->log_ctx, AV_LOG_ERROR, "SPS id %d not available.\n",
+               current->pps_seq_parameter_set_id);
+        return AVERROR_INVALIDDATA;
+    }
+    h266->active_sps = sps;
+
+    flag(pps_mixed_nalu_types_in_pic_flag);
+    ue(pps_pic_width_in_luma_samples, 1, sps->sps_pic_width_max_in_luma_samples);
+    ue(pps_pic_height_in_luma_samples, 1, sps->sps_pic_height_max_in_luma_samples);
+
+    min_cb_size_y = 1 << (sps->sps_log2_min_luma_coding_block_size_minus2 + 2);
+    divisor = FFMAX(min_cb_size_y, 8);
+    if (current->pps_pic_width_in_luma_samples  % divisor ||
+        current->pps_pic_height_in_luma_samples % divisor) {
+        av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid dimensions: %ux%u not divisible "
+               "by %u, MinCbSizeY = %u.\n", current->pps_pic_width_in_luma_samples,
+               current->pps_pic_height_in_luma_samples, divisor, min_cb_size_y);
+        return AVERROR_INVALIDDATA;
+    }
+    if (!sps->sps_res_change_in_clvs_allowed_flag &&
+        (current->pps_pic_width_in_luma_samples != sps->sps_pic_width_max_in_luma_samples ||
+        current->pps_pic_height_in_luma_samples != sps->sps_pic_height_max_in_luma_samples)) {
+        av_log(ctx->log_ctx, AV_LOG_ERROR, "Resoltuion change is not allowed, in max resolution (%ux%u) mismatched with pps(%ux%u).\n",
+            sps->sps_pic_width_max_in_luma_samples,
+            sps->sps_pic_height_max_in_luma_samples,
+            current->pps_pic_width_in_luma_samples,
+            current->pps_pic_height_in_luma_samples);
+        return AVERROR_INVALIDDATA;
+    }
+
+    ctb_size_y = 1 << (sps->sps_log2_ctu_size_minus5 + 5);
+    if (sps->sps_ref_wraparound_enabled_flag) {
+        if ((ctb_size_y / min_cb_size_y + 1) > (current->pps_pic_width_in_luma_samples / min_cb_size_y - 1)) {
+            av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid width(%u), ctb_size_y = %u, min_cb_size_y = %u.\n",
+                current->pps_pic_width_in_luma_samples,
+                ctb_size_y, min_cb_size_y);
+            return AVERROR_INVALIDDATA;
+        }
+    }
+
+    flag(pps_conformance_window_flag);
+    if (current->pps_pic_width_in_luma_samples == sps->sps_pic_width_max_in_luma_samples &&
+        current->pps_pic_height_in_luma_samples == sps->sps_pic_height_max_in_luma_samples &&
+        current->pps_conformance_window_flag) {
+        av_log(ctx->log_ctx, AV_LOG_ERROR, "Conformance window flag should not true.\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    sub_width_c = h266_sub_width_c[sps->sps_chroma_format_idc];
+    sub_height_c = h266_sub_height_c[sps->sps_chroma_format_idc];
+    if (current->pps_conformance_window_flag) {
+        ue(pps_conf_win_left_offset, 0, current->pps_pic_width_in_luma_samples);
+        ue(pps_conf_win_right_offset, 0, current->pps_pic_width_in_luma_samples);
+        ue(pps_conf_win_top_offset, 0, current->pps_pic_height_in_luma_samples);
+        ue(pps_conf_win_bottom_offset, 0, current->pps_pic_height_in_luma_samples);
+        if (sub_width_c * (current->pps_conf_win_left_offset + current->pps_conf_win_right_offset) >= current->pps_pic_width_in_luma_samples ||
+            sub_height_c * (current->pps_conf_win_top_offset + current->pps_conf_win_bottom_offset) >= current->pps_pic_height_in_luma_samples) {
+            av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid pps conformance window: (%u, %u, %u, %u), resolution is %ux%u, sub wxh is %ux%u.\n",
+                current->pps_conf_win_left_offset, current->pps_conf_win_right_offset,
+                current->pps_conf_win_top_offset, current->pps_conf_win_bottom_offset,
+                current->pps_pic_width_in_luma_samples, current->pps_pic_height_in_luma_samples,
+                sub_width_c, sub_height_c);
+            return AVERROR_INVALIDDATA;
+        }
+    } else {
+        if (current->pps_pic_width_in_luma_samples == sps->sps_pic_width_max_in_luma_samples &&
+            current->pps_pic_height_in_luma_samples == sps->sps_pic_height_max_in_luma_samples) {
+            infer(pps_conf_win_left_offset, sps->sps_conf_win_left_offset);
+            infer(pps_conf_win_right_offset, sps->sps_conf_win_right_offset);
+            infer(pps_conf_win_top_offset, sps->sps_conf_win_top_offset);
+            infer(pps_conf_win_bottom_offset, sps->sps_conf_win_bottom_offset);
+        } else {
+            infer(pps_conf_win_left_offset, 0);
+            infer(pps_conf_win_right_offset, 0);
+            infer(pps_conf_win_top_offset, 0);
+            infer(pps_conf_win_bottom_offset, 0);
+        }
+
+    }
+
+    flag(pps_scaling_window_explicit_signalling_flag);
+    if (!sps->sps_ref_pic_resampling_enabled_flag && current->pps_scaling_window_explicit_signalling_flag) {
+        av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid data: sps_ref_pic_resampling_enabled_flag is false, but pps_scaling_window_explicit_signalling_flag is true.\n");
+        return AVERROR_INVALIDDATA;
+    }
+    if (current->pps_scaling_window_explicit_signalling_flag) {
+        se(pps_scaling_win_left_offset, -current->pps_pic_width_in_luma_samples * 15 / sub_width_c, current->pps_pic_width_in_luma_samples /  sub_width_c);
+        se(pps_scaling_win_right_offset, -current->pps_pic_width_in_luma_samples * 15 / sub_width_c, current->pps_pic_width_in_luma_samples /  sub_width_c);
+        se(pps_scaling_win_top_offset, -current->pps_pic_height_in_luma_samples * 15 / sub_height_c, current->pps_pic_height_in_luma_samples /  sub_height_c);
+        se(pps_scaling_win_bottom_offset, -current->pps_pic_height_in_luma_samples * 15 /sub_height_c, current->pps_pic_height_in_luma_samples /  sub_height_c);
+    } else {
+        infer(pps_scaling_win_left_offset, current->pps_conf_win_left_offset);
+        infer(pps_scaling_win_right_offset, current->pps_conf_win_right_offset);
+        infer(pps_scaling_win_top_offset, current->pps_conf_win_top_offset);
+        infer(pps_scaling_win_bottom_offset, current->pps_conf_win_bottom_offset);
+    }
+
+    flag(pps_output_flag_present_flag);
+    flag(pps_no_pic_partition_flag);
+    flag(pps_subpic_id_mapping_present_flag);
+
+    if(current->pps_subpic_id_mapping_present_flag ) {
+        av_log(ctx->log_ctx, AV_LOG_ERROR, "pps_subpic_id_mapping_present_flag is not supported.\n");
+        return AVERROR_PATCHWELCOME;
+    }
+
+    if(!current->pps_no_pic_partition_flag ) {
+        unsigned int exp_tile_width = 0, exp_tile_height = 0;
+        pic_width_in_ctbs_y = ceil(current->pps_pic_width_in_luma_samples / (double)ctb_size_y);
+        pic_height_in_ctbs_y = ceil(current->pps_pic_height_in_luma_samples / (double)ctb_size_y);
+        u(2, pps_log2_ctu_size_minus5, sps->sps_log2_ctu_size_minus5, sps->sps_log2_ctu_size_minus5);
+
+        ue(pps_num_exp_tile_columns_minus1, 0, FFMIN(pic_width_in_ctbs_y - 1, H266_MAX_TILE_COLUMNS));
+        ue(pps_num_exp_tile_rows_minus1, 0, FFMIN(pic_height_in_ctbs_y - 1, H266_MAX_TILE_ROWS));
+
+        for( i = 0; i <= current->pps_num_exp_tile_columns_minus1; i++ ) {
+            ues(pps_tile_column_width_minus1[i], 0, pic_width_in_ctbs_y - 1, 1, i);
+            exp_tile_width += current->pps_tile_column_width_minus1[i] + 1;
+        }
+        current->num_tile_columns = get_num_tile(current->pps_tile_column_width_minus1, current->pps_num_exp_tile_columns_minus1, pic_width_in_ctbs_y, exp_tile_width);
+
+        for( i = 0; i <= current->pps_num_exp_tile_rows_minus1; i++ ) {
+            ues(pps_tile_row_height_minus1[i], 0, pic_height_in_ctbs_y - 1, 1, i);
+            exp_tile_height += current->pps_tile_row_height_minus1[i] + 1;
+        }
+        current->num_tile_rows = get_num_tile(current->pps_tile_row_height_minus1, current->pps_num_exp_tile_rows_minus1, pic_height_in_ctbs_y, exp_tile_height);
+
+        current->num_tiles_in_pic = current->num_tile_columns * current->num_tile_rows;
+        if (current->num_tiles_in_pic > 1) {
+            flag(pps_loop_filter_across_tiles_enabled_flag);
+            flag(pps_rect_slice_flag);
+        } else {
+            infer(pps_loop_filter_across_tiles_enabled_flag, 0);
+            infer(pps_rect_slice_flag, 1);
+        }
+        if(current->pps_rect_slice_flag)
+            flag(pps_single_slice_per_subpic_flag);
+        else
+            infer(pps_single_slice_per_subpic_flag, 1);
+        if(current->pps_rect_slice_flag && !current->pps_single_slice_per_subpic_flag) {
+            ue(pps_num_slices_in_pic_minus1, 0, H266_MAX_SLICES);
+            if(current->pps_num_slices_in_pic_minus1 > 1 )
+                flag(pps_tile_idx_delta_present_flag);
+            else
+                infer(pps_tile_idx_delta_present_flag, 0);
+            return AVERROR_PATCHWELCOME;
+        }
+        if( !current->pps_rect_slice_flag || current->pps_single_slice_per_subpic_flag || current->pps_num_slices_in_pic_minus1 > 0 )
+            flag(pps_loop_filter_across_slices_enabled_flag);
+        else
+            infer(pps_loop_filter_across_slices_enabled_flag, 0);
+    } else {
+        infer(pps_num_exp_tile_columns_minus1, 0);
+        infer(pps_num_exp_tile_rows_minus1, 0);
+        infer(num_tile_columns, 1);
+        infer(num_tile_rows, 1);
+        infer(num_tiles_in_pic, 1);
+   }
+    flag(pps_cabac_init_present_flag);
+    for( i = 0; i < 2; i++ )
+        ues(pps_num_ref_idx_default_active_minus1[i], 0, 14, 1, i);
+    flag(pps_rpl1_idx_present_flag);
+    flag(pps_weighted_pred_flag);
+    flag(pps_weighted_bipred_flag);
+    flag(pps_ref_wraparound_enabled_flag);
+    if(current->pps_ref_wraparound_enabled_flag)
+        ue(pps_pic_width_minus_wraparound_offset, 0, (current->pps_pic_width_in_luma_samples / min_cb_size_y) - (ctb_size_y / min_cb_size_y) - 2);
+
+    se(pps_init_qp_minus26, -(26 + sps->qp_bd_offset), 37);
+    flag(pps_cu_qp_delta_enabled_flag);
+    flag(pps_chroma_tool_offsets_present_flag);
+    if(current->pps_chroma_tool_offsets_present_flag) {
+        se(pps_cb_qp_offset, -12, 12);
+        se(pps_cr_qp_offset, -12, 12);
+        flag(pps_joint_cbcr_qp_offset_present_flag);
+        if (current->pps_joint_cbcr_qp_offset_present_flag)
+            se(pps_joint_cbcr_qp_offset_value, -12, 12);
+        else
+            infer(pps_joint_cbcr_qp_offset_value, 0);
+        flag(pps_slice_chroma_qp_offsets_present_flag);
+        flag(pps_cu_chroma_qp_offset_list_enabled_flag);
+        if (current->pps_cu_chroma_qp_offset_list_enabled_flag) {
+            return AVERROR_PATCHWELCOME;
+        }
+    } else {
+        infer(pps_cb_qp_offset, 0);
+        infer(pps_cr_qp_offset, 0);
+        infer(pps_joint_cbcr_qp_offset_present_flag, 0);
+        infer(pps_joint_cbcr_qp_offset_value, 0);
+        infer(pps_slice_chroma_qp_offsets_present_flag, 0);
+        infer(pps_cu_chroma_qp_offset_list_enabled_flag, 0);
+    }
+    flag(pps_deblocking_filter_control_present_flag);
+    if (current->pps_deblocking_filter_control_present_flag) {
+        return AVERROR_PATCHWELCOME;
+    }
+    if(!current->pps_no_pic_partition_flag) {
+        return AVERROR_PATCHWELCOME;
+    }
+    flag(pps_picture_header_extension_present_flag);
+    flag(pps_slice_header_extension_present_flag);
+    flag(pps_extension_flag);
+    if(current->pps_extension_flag) {
+        return AVERROR_PATCHWELCOME;
+    }
+    CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
+    return 0;
+}
+
+static int FUNC(aud)(CodedBitstreamContext *ctx, RWContext *rw,
+                     H266RawAUD *current)
+{
+    int err;
+
+    HEADER("Access Unit Delimiter");
+
+    CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header, HEVC_NAL_AUD));
+
+    flag(aud_irap_or_gdr_flag);
+    ub(3, aud_pic_type);
+
+    CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
+    return 0;
+}
+
+static int FUNC(picture_header)(CodedBitstreamContext *ctx, RWContext *rw,
+                                      H266RawPH *current)
+{
+    CodedBitstreamH266Context *h266 = ctx->priv_data;
+    const H266RawSPS *sps;
+    const H266RawPPS *pps;
+    int err, i;
+    unsigned int ctb_log2_size_y, min_cb_log2_size_y,
+        min_qt_log2_size_intra_y, min_qt_log2_size_inter_y;
+
+    flag(ph_gdr_or_irap_pic_flag);
+    flag(ph_non_ref_pic_flag);
+    if(current->ph_gdr_or_irap_pic_flag)
+        flag(ph_gdr_pic_flag);
+    else
+        infer(ph_gdr_pic_flag, 0);
+    flag(ph_inter_slice_allowed_flag);
+    if (current->ph_inter_slice_allowed_flag)
+        flag(ph_intra_slice_allowed_flag);
+    else
+        infer(ph_intra_slice_allowed_flag, 1);
+    ue(ph_pic_parameter_set_id, 0, 63);
+    pps = h266->pps[current->ph_pic_parameter_set_id];
+    if (!pps) {
+        av_log(ctx->log_ctx, AV_LOG_ERROR, "PPS id %d not available.\n",
+               pps->pps_seq_parameter_set_id);
+        return AVERROR_INVALIDDATA;
+    }
+    sps = h266->sps[pps->pps_seq_parameter_set_id];
+    if (!pps) {
+        av_log(ctx->log_ctx, AV_LOG_ERROR, "sps id %d not available.\n",
+               pps->pps_seq_parameter_set_id);
+        return AVERROR_INVALIDDATA;
+    }
+    h266->active_sps = sps;
+    h266->active_pps = pps;
+
+    ub(sps->sps_log2_max_pic_order_cnt_lsb_minus4 + 4, ph_pic_order_cnt_lsb);
+    if(current->ph_gdr_pic_flag)
+        ub(sps->sps_log2_max_pic_order_cnt_lsb_minus4 + 4, ph_recovery_poc_cnt);
+
+    for( i = 0; i < sps->num_extra_sh_bits; i++) {
+        flags(ph_extra_bit[i], 1, i);
+    }
+    if(sps->sps_poc_msb_cycle_flag) {
+        return AVERROR_PATCHWELCOME;
+    }
+    if(sps->sps_alf_enabled_flag && pps->pps_alf_info_in_ph_flag) {
+        return AVERROR_PATCHWELCOME;
+    }
+    if(sps->sps_lmcs_enabled_flag) {
+        flag(ph_lmcs_enabled_flag);
+        if (current->ph_lmcs_enabled_flag) {
+            ub(2, ph_lmcs_aps_id);
+            if(sps->sps_chroma_format_idc != 0 )
+                flag(ph_chroma_residual_scale_flag);
+            else
+                infer(ph_chroma_residual_scale_flag, 0);
+        }
+    } else {
+        infer(ph_lmcs_enabled_flag, 0);
+        infer(ph_chroma_residual_scale_flag, 0);
+    }
+
+    if(sps->sps_explicit_scaling_list_enabled_flag) {
+        return AVERROR_PATCHWELCOME;
+    }
+    if(sps->sps_virtual_boundaries_enabled_flag && !sps->sps_virtual_boundaries_present_flag) {
+        return AVERROR_PATCHWELCOME;
+    }
+    if(pps->pps_output_flag_present_flag && !current->ph_non_ref_pic_flag)
+        flag(ph_pic_output_flag);
+    else
+        infer(ph_pic_output_flag, 1);
+    if(pps->pps_rpl_info_in_ph_flag) {
+        CHECK(FUNC(ref_pic_lists)(ctx, rw, &current->ph_ref_pic_lists));
+    }
+    if(sps->sps_partition_constraints_override_enabled_flag)
+        flag(ph_partition_constraints_override_flag);
+    else
+        infer(ph_partition_constraints_override_flag, 0);
+
+    ctb_log2_size_y = sps->sps_log2_ctu_size_minus5 + 5;
+    min_cb_log2_size_y = sps->min_cb_log2_size_y;
+    if(current->ph_intra_slice_allowed_flag) {
+        if(current->ph_partition_constraints_override_flag ) {
+            ue(ph_log2_diff_min_qt_min_cb_intra_slice_luma, 0, FFMIN(6, ctb_log2_size_y) - min_cb_log2_size_y);
+            ue(ph_max_mtt_hierarchy_depth_intra_slice_luma, 0, 2 * (ctb_log2_size_y - min_cb_log2_size_y));
+            if (current->ph_max_mtt_hierarchy_depth_intra_slice_luma) {
+                ue(ph_log2_diff_max_bt_min_qt_intra_slice_luma, 0, ctb_log2_size_y - min_qt_log2_size_intra_y);
+                ue(ph_log2_diff_max_tt_min_qt_intra_slice_luma, 0, FFMIN(6, ctb_log2_size_y) - min_qt_log2_size_intra_y);
+            } else {
+                infer(ph_log2_diff_max_bt_min_qt_intra_slice_luma, sps->sps_log2_diff_max_bt_min_qt_intra_slice_luma);
+                infer(ph_log2_diff_max_tt_min_qt_intra_slice_luma, sps->sps_log2_diff_max_tt_min_qt_intra_slice_luma);
+            }
+            if (sps->sps_qtbtt_dual_tree_intra_flag ) {
+                ue(ph_log2_diff_min_qt_min_cb_intra_slice_chroma, 0, FFMIN(6, ctb_log2_size_y) - min_cb_log2_size_y);
+                ue(ph_max_mtt_hierarchy_depth_intra_slice_chroma, 0, 2 * (ctb_log2_size_y - min_cb_log2_size_y));
+                if(sps->sps_max_mtt_hierarchy_depth_intra_slice_chroma) {
+                    unsigned int min_qt_log2_size_intra_c = sps->sps_log2_diff_min_qt_min_cb_intra_slice_chroma + min_cb_log2_size_y;
+                    ue(ph_log2_diff_max_bt_min_qt_intra_slice_chroma, 0, FFMIN(6, ctb_log2_size_y) - min_qt_log2_size_intra_c);
+                    ue(ph_log2_diff_max_tt_min_qt_intra_slice_chroma, 0, FFMIN(6, ctb_log2_size_y) - min_qt_log2_size_intra_c);
+                } else {
+                    infer(ph_log2_diff_max_bt_min_qt_intra_slice_chroma, sps->sps_log2_diff_max_bt_min_qt_intra_slice_chroma);
+                    infer(ph_log2_diff_max_tt_min_qt_intra_slice_chroma, sps->sps_log2_diff_max_tt_min_qt_intra_slice_chroma);
+                }
+            }
+        } else {
+            infer(ph_log2_diff_min_qt_min_cb_intra_slice_luma, sps->sps_log2_diff_min_qt_min_cb_intra_slice_luma);
+            infer(ph_max_mtt_hierarchy_depth_intra_slice_luma, sps->sps_max_mtt_hierarchy_depth_intra_slice_luma);
+            infer(ph_log2_diff_max_bt_min_qt_intra_slice_luma, sps->sps_log2_diff_max_bt_min_qt_intra_slice_luma);
+            infer(ph_log2_diff_max_tt_min_qt_intra_slice_luma, sps->sps_log2_diff_max_tt_min_qt_intra_slice_luma);
+            infer(ph_log2_diff_min_qt_min_cb_intra_slice_chroma, sps->sps_log2_diff_min_qt_min_cb_intra_slice_chroma);
+            infer(ph_max_mtt_hierarchy_depth_intra_slice_chroma, sps->sps_max_mtt_hierarchy_depth_intra_slice_chroma);
+            infer(ph_log2_diff_max_bt_min_qt_intra_slice_chroma, sps->sps_log2_diff_max_bt_min_qt_intra_slice_chroma);
+            infer(ph_log2_diff_max_tt_min_qt_intra_slice_chroma, sps->sps_log2_diff_max_tt_min_qt_intra_slice_chroma);
+        }
+
+        min_qt_log2_size_intra_y = current->ph_log2_diff_min_qt_min_cb_intra_slice_luma + ctb_log2_size_y;
+        if(pps->pps_cu_qp_delta_enabled_flag)
+            ue(ph_cu_qp_delta_subdiv_intra_slice, 0,  2 * ( ctb_log2_size_y - min_qt_log2_size_intra_y + current->ph_max_mtt_hierarchy_depth_intra_slice_luma ));
+        else
+            infer(ph_cu_qp_delta_subdiv_intra_slice, 0);
+
+        if(pps->pps_cu_chroma_qp_offset_list_enabled_flag)
+            ue(ph_cu_chroma_qp_offset_subdiv_intra_slice, 0, 2 * (ctb_log2_size_y - min_qt_log2_size_intra_y + current->ph_max_mtt_hierarchy_depth_intra_slice_luma ));
+        else
+            infer(ph_cu_chroma_qp_offset_subdiv_intra_slice, 0);
+    }
+    if(current->ph_inter_slice_allowed_flag) {
+        if(current->ph_partition_constraints_override_flag) {
+            ue(ph_log2_diff_min_qt_min_cb_inter_slice, 0, FFMIN(6, ctb_log2_size_y) - min_cb_log2_size_y);
+            min_qt_log2_size_inter_y = current->ph_log2_diff_min_qt_min_cb_inter_slice + ctb_log2_size_y;
+            ue(ph_max_mtt_hierarchy_depth_inter_slice, 0, 2 * (ctb_log2_size_y - min_cb_log2_size_y));
+            if(current->ph_max_mtt_hierarchy_depth_inter_slice) {
+                ue(ph_log2_diff_max_bt_min_qt_inter_slice, 0, ctb_log2_size_y - min_qt_log2_size_inter_y);
+                ue(ph_log2_diff_max_tt_min_qt_inter_slice, 0, FFMIN(6, ctb_log2_size_y) - min_qt_log2_size_inter_y);
+            }
+        } else {
+            infer(ph_log2_diff_min_qt_min_cb_inter_slice, sps->sps_log2_diff_min_qt_min_cb_inter_slice);
+            min_qt_log2_size_inter_y = current->ph_log2_diff_min_qt_min_cb_inter_slice + ctb_log2_size_y;
+            infer(ph_max_mtt_hierarchy_depth_inter_slice, sps->sps_max_mtt_hierarchy_depth_inter_slice);
+            infer(ph_log2_diff_max_bt_min_qt_inter_slice, sps->sps_log2_diff_max_bt_min_qt_inter_slice);
+            infer(ph_log2_diff_max_tt_min_qt_inter_slice, sps->sps_log2_diff_max_tt_min_qt_inter_slice);
+        }
+
+        if (pps->pps_cu_qp_delta_enabled_flag)
+            ue(ph_cu_qp_delta_subdiv_inter_slice,  0, 2 * ( ctb_log2_size_y - min_qt_log2_size_inter_y + current->ph_max_mtt_hierarchy_depth_inter_slice));
+        else
+            infer(ph_cu_qp_delta_subdiv_inter_slice, 0);
+
+        if(pps->pps_cu_chroma_qp_offset_list_enabled_flag)
+            ue(ph_cu_chroma_qp_offset_subdiv_inter_slice, 0, 2 * (ctb_log2_size_y - min_qt_log2_size_inter_y + current->ph_max_mtt_hierarchy_depth_inter_slice));
+        else
+            infer(ph_cu_chroma_qp_offset_subdiv_inter_slice, 0);
+        if (sps->sps_temporal_mvp_enabled_flag) {
+            flag(ph_temporal_mvp_enabled_flag);
+            if (current->ph_temporal_mvp_enabled_flag && pps->pps_rpl_info_in_ph_flag) {
+                if (current->ph_ref_pic_lists.rpl_ref_list[1].num_ref_entries > 0)
+                    flag(ph_collocated_from_l0_flag);
+                else
+                    infer(ph_collocated_from_l0_flag, 1);
+                if ((current->ph_collocated_from_l0_flag &&
+                    current->ph_ref_pic_lists.rpl_ref_list[0].num_ref_entries > 1) ||
+                    (!current->ph_collocated_from_l0_flag &&
+                    current->ph_ref_pic_lists.rpl_ref_list[1].num_ref_entries > 1)) {
+                    unsigned int idx = current->ph_collocated_from_l0_flag ? 0 : 1;
+                    ue(ph_collocated_ref_idx, 0,  current->ph_ref_pic_lists.rpl_ref_list[idx].num_ref_entries - 1);
+                } else {
+                    infer(ph_collocated_ref_idx, 0);
+                }
+            }
+            if(sps->sps_mmvd_fullpel_only_enabled_flag)
+                flag(ph_mmvd_fullpel_only_flag);
+            else
+                infer(ph_mmvd_fullpel_only_flag, 0);
+            if (!pps->pps_rpl_info_in_ph_flag || current->ph_ref_pic_lists.rpl_ref_list[1].num_ref_entries > 0) {
+                flag(ph_mvd_l1_zero_flag);
+                if (sps->sps_bdof_control_present_in_ph_flag) {
+                    flag(ph_bdof_disabled_flag);
+                } else {
+                    if (!sps->sps_bdof_control_present_in_ph_flag)
+                        infer(ph_bdof_disabled_flag, 1 - sps->sps_bdof_enabled_flag);
+                    else
+                        infer(ph_bdof_disabled_flag, 1);
+                }
+                if (sps->sps_dmvr_control_present_in_ph_flag) {
+                    flag(ph_dmvr_disabled_flag);
+                } else {
+                    if (!sps->sps_dmvr_control_present_in_ph_flag)
+                        infer(ph_dmvr_disabled_flag, 1 - sps->sps_dmvr_enabled_flag);
+                    else
+                        infer(ph_dmvr_disabled_flag, 1);
+                }
+            } else {
+                infer(ph_mvd_l1_zero_flag, 1);
+            }
+            if (sps->sps_prof_control_present_in_ph_flag)
+                flag(ph_prof_disabled_flag);
+            else
+                infer(ph_prof_disabled_flag, !sps->sps_affine_prof_enabled_flag);
+            if((pps->pps_weighted_pred_flag || pps->pps_weighted_bipred_flag) &&
+                pps->pps_wp_info_in_ph_flag) {
+                return AVERROR_PATCHWELCOME;
+            }
+        }
+    }
+
+    if (pps->pps_qp_delta_info_in_ph_flag)
+        se(ph_qp_delta, -sps->qp_bd_offset - (26 + pps->pps_init_qp_minus26), 63 - (26 + pps->pps_init_qp_minus26));
+
+    if (sps->sps_joint_cbcr_enabled_flag)
+        flag(ph_joint_cbcr_sign_flag);
+    else
+        infer(ph_joint_cbcr_sign_flag, 0);
+    if (sps->sps_sao_enabled_flag && pps->pps_sao_info_in_ph_flag ) {
+        flag(ph_sao_luma_enabled_flag);
+        if (sps->sps_chroma_format_idc)
+            flag(ph_sao_chroma_enabled_flag);
+        else
+            infer(ph_sao_chroma_enabled_flag, 0);
+    } else {
+        infer(ph_sao_luma_enabled_flag, 0);
+        infer(ph_sao_chroma_enabled_flag, 0);
+    }
+
+    if(pps->pps_dbf_info_in_ph_flag) {
+        return AVERROR_PATCHWELCOME;
+    }
+    if(pps->pps_picture_header_extension_present_flag) {
+        return AVERROR_PATCHWELCOME;
+    }
+    h266->active_ph = current;
+    return 0;
+}
+
+static int FUNC(slice_header)(CodedBitstreamContext *ctx, RWContext *rw,
+                                      H266RawSliceHeader *current)
+{
+    CodedBitstreamH266Context *h266 = ctx->priv_data;
+    const H266RawSPS *sps;
+    const H266RawPPS *pps;
+    const H266RawPH  *ph;
+    const H266RefPicLists* ref_pic_lists;
+    int err, i;
+    uint8_t nal_unit_type;
+
+    HEADER("Slice Header");
+
+    CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header, -1));
+
+    flag(sh_picture_header_in_slice_header_flag);
+    if (current->sh_picture_header_in_slice_header_flag){
+        CHECK(FUNC(picture_header)(ctx, rw, &h266->ph));
+    }
+    sps = h266->active_sps;
+    pps = h266->active_pps;
+    ph  = &h266->ph;
+
+    if (!sps || !pps) {
+        av_log(ctx->log_ctx, AV_LOG_ERROR, "no sps(%p) or pps(%p).\n", sps, pps);
+        return AVERROR_INVALIDDATA;
+    }
+
+    if(sps->sps_subpic_info_present_flag)
+        ub(sps->sps_subpic_id_len_minus1 + 1, sh_subpic_id);
+    if (pps->pps_rect_slice_flag)
+        return AVERROR_PATCHWELCOME;
+    if((!pps->pps_rect_slice_flag && pps->num_tiles_in_pic > 1)) {
+        unsigned int bits, max;
+        if (!pps->pps_rect_slice_flag) {
+            bits = ceil(log2(pps->num_tiles_in_pic));
+            max = pps->num_tiles_in_pic - 1;
+        } else {
+            return AVERROR_PATCHWELCOME;
+        }
+        u(bits, sh_slice_address, 0, max);
+    } else {
+        infer(sh_slice_address, 0);
+    }
+
+    for (i = 0; i < sps->num_extra_sh_bits; i++) {
+        flags(sh_extra_bit[i], 1, i);
+    }
+
+    if (!pps->pps_rect_slice_flag && pps->num_tiles_in_pic - current->sh_slice_address > 1)
+        ue(sh_num_tiles_in_slice_minus1, 0, pps->num_tiles_in_pic - 1);
+    else
+        infer(sh_num_tiles_in_slice_minus1, 0);
+
+    if (ph->ph_inter_slice_allowed_flag)
+        ue(sh_slice_type, 0, 2);
+    else
+        infer(sh_slice_type, 2);
+
+    nal_unit_type = current->nal_unit_header.nal_unit_type;
+    if (nal_unit_type == H266_NAL_IDR_W_RADL ||
+        nal_unit_type == H266_NAL_IDR_N_LP ||
+        nal_unit_type == H266_NAL_CRA_NUT ||
+        nal_unit_type == H266_NAL_GDR_NUT)
+        flag(sh_no_output_of_prior_pics_flag);
+    if(sps->sps_alf_enabled_flag && !pps->pps_alf_info_in_ph_flag) {
+        flag(sh_alf_enabled_flag);
+        if (current->sh_alf_enabled_flag) {
+            ub(3, sh_num_alf_aps_ids_luma);
+            for (i = 0; i < current->sh_num_alf_aps_ids_luma; i++ )
+                ubs(3, sh_alf_aps_id_luma[i], 1, i);
+            if (sps->sps_chroma_format_idc != 0) {
+                flag(sh_alf_cb_enabled_flag);
+                flag(sh_alf_cr_enabled_flag);
+            } else {
+                infer(sh_alf_cb_enabled_flag, ph->ph_alf_cb_enabled_flag);
+                infer(sh_alf_cr_enabled_flag, ph->ph_alf_cr_enabled_flag);
+            }
+            if(current->sh_alf_cb_enabled_flag || current->sh_alf_cr_enabled_flag)
+                ub(3, sh_alf_aps_id_chroma);
+            else
+                infer(sh_alf_aps_id_chroma, ph->ph_alf_aps_id_chroma);
+            if(sps->sps_ccalf_enabled_flag ) {
+                flag(sh_alf_cc_cb_enabled_flag);
+                if(current->sh_alf_cc_cb_enabled_flag)
+                    ub(3, sh_alf_cc_cb_aps_id);
+                else
+                    infer(sh_alf_cc_cb_aps_id, ph->ph_alf_cc_cb_aps_id);
+                flag(sh_alf_cc_cr_enabled_flag);
+                if(current->sh_alf_cc_cr_enabled_flag)
+                    ub(3, sh_alf_cc_cr_aps_id);
+                else
+                    infer(sh_alf_cc_cr_aps_id, ph->ph_alf_cc_cr_aps_id);
+            } else {
+                infer(sh_alf_cc_cb_enabled_flag, ph->ph_alf_cc_cb_enabled_flag);
+                infer(sh_alf_cc_cr_enabled_flag, ph->ph_alf_cc_cr_enabled_flag);
+                infer(sh_alf_cc_cb_aps_id, ph->ph_alf_cc_cb_aps_id);
+                infer(sh_alf_cc_cr_aps_id, ph->ph_alf_cc_cr_aps_id);
+            }
+        }
+    } else {
+        infer(sh_alf_enabled_flag, 0);
+    }
+
+    if (ph->ph_lmcs_enabled_flag && !current->sh_picture_header_in_slice_header_flag )
+        flag(sh_lmcs_used_flag);
+    else
+        infer(sh_lmcs_used_flag, 0);
+
+    if (ph->ph_explicit_scaling_list_enabled_flag && !current->sh_picture_header_in_slice_header_flag)
+        flag(sh_explicit_scaling_list_used_flag);
+    else
+        infer(sh_explicit_scaling_list_used_flag, 0);
+
+    if(!pps->pps_rpl_info_in_ph_flag &&
+        ((nal_unit_type != H266_NAL_IDR_W_RADL && nal_unit_type != H266_NAL_IDR_N_LP) ||
+            sps->sps_idr_rpl_present_flag)) {
+            CHECK(FUNC(ref_pic_lists)(ctx, rw, &current->sh_ref_pic_lists));
+        ref_pic_lists = &current->sh_ref_pic_lists;
+    } else {
+        ref_pic_lists = &h266->ph.ph_ref_pic_lists;
+    }
+    if ((current->sh_slice_type != H266_SLICE_I && ref_pic_lists->rpl_ref_list[0].num_ref_entries > 1) ||
+        (current->sh_slice_type == H266_SLICE_B && ref_pic_lists->rpl_ref_list[1].num_ref_entries > 1)) {
+        flag(sh_num_ref_idx_active_override_flag);
+        if (current->sh_num_ref_idx_active_override_flag) {
+            for( i = 0; i < (current->sh_slice_type == H266_SLICE_B ? 2: 1 ); i++ )
+                if(ref_pic_lists->rpl_ref_list[i].num_ref_entries > 1)
+                    ues(sh_num_ref_idx_active_minus1[i], 0, 14, 1, i);
+                else
+                    infer(sh_num_ref_idx_active_minus1[i], 0);
+        }
+    } else {
+        infer(sh_num_ref_idx_active_override_flag, 1);
+    }
+    if (current->sh_slice_type != H266_SLICE_I) {
+        if (pps->pps_cabac_init_present_flag)
+            flag(sh_cabac_init_flag);
+        else
+            infer(sh_cabac_init_flag, 0);
+        if (ph->ph_temporal_mvp_enabled_flag && !pps->pps_rpl_info_in_ph_flag) {
+            if (current->sh_slice_type == H266_SLICE_B)
+                flag(sh_collocated_from_l0_flag);
+            else
+                infer(sh_collocated_from_l0_flag, 1);
+            if((current->sh_collocated_from_l0_flag && ref_pic_lists->rpl_ref_list[0].num_ref_entries > 1) ||
+                (!current->sh_collocated_from_l0_flag && ref_pic_lists->rpl_ref_list[0].num_ref_entries > 1)) {
+                unsigned int idx = current->sh_collocated_from_l0_flag ? 0 : 1;
+                ue(sh_collocated_ref_idx, 0,  ref_pic_lists->rpl_ref_list[idx].num_ref_entries - 1);
+            } else {
+                infer(sh_collocated_ref_idx, 0);
+            }
+            if(!pps->pps_wp_info_in_ph_flag &&
+                ((pps->pps_weighted_pred_flag && current->sh_slice_type == H266_SLICE_P) ||
+                (pps->pps_weighted_bipred_flag && current->sh_slice_type == H266_SLICE_B)))
+                return AVERROR_PATCHWELCOME;
+        }
+
+    }
+    if(!pps->pps_qp_delta_info_in_ph_flag )
+        se(sh_qp_delta, -sps->qp_bd_offset - (26 + pps->pps_init_qp_minus26), 63 - (26 + pps->pps_init_qp_minus26));
+    if(pps->pps_slice_chroma_qp_offsets_present_flag) {
+        return AVERROR_PATCHWELCOME;
+    }
+    if(pps->pps_cu_chroma_qp_offset_list_enabled_flag)
+        flag(sh_cu_chroma_qp_offset_enabled_flag);
+    else
+        infer(sh_cu_chroma_qp_offset_enabled_flag, 0);
+    if (sps->sps_sao_enabled_flag && !pps->pps_sao_info_in_ph_flag) {
+        flag(sh_sao_luma_used_flag);
+        if (sps->sps_chroma_format_idc != 0)
+            flag(sh_sao_chroma_used_flag);
+        else
+            infer(sh_sao_chroma_used_flag, ph->ph_sao_chroma_enabled_flag);
+    } else {
+        infer(sh_sao_luma_used_flag, ph->ph_sao_luma_enabled_flag);
+        infer(sh_sao_chroma_used_flag, ph->ph_sao_chroma_enabled_flag);
+    }
+
+    if(pps->pps_deblocking_filter_override_enabled_flag && !pps->pps_dbf_info_in_ph_flag )
+        flag(sh_deblocking_params_present_flag);
+    else
+        infer(sh_deblocking_params_present_flag, 0);
+    if (current->sh_deblocking_params_present_flag) {
+        return AVERROR_PATCHWELCOME;
+    }
+
+    if(sps->sps_dep_quant_enabled_flag)
+        flag(sh_dep_quant_used_flag);
+    else
+        infer(sh_dep_quant_used_flag, 0);
+
+    if(sps->sps_sign_data_hiding_enabled_flag && !current->sh_dep_quant_used_flag)
+        flag(sh_sign_data_hiding_used_flag);
+    else
+        infer(sh_sign_data_hiding_used_flag, 0);
+
+    if(sps->sps_transform_skip_enabled_flag && !current->sh_dep_quant_used_flag && !current->sh_sign_data_hiding_used_flag)
+        flag(sh_ts_residual_coding_disabled_flag);
+    else
+        infer(sh_ts_residual_coding_disabled_flag, 0);
+    if(pps->pps_slice_header_extension_present_flag) {
+        return AVERROR_PATCHWELCOME;
+    }
+    if(sps->sps_entry_point_offsets_present_flag)  {
+        unsigned int num_entry_points = 0;
+        if (pps->pps_rect_slice_flag) {
+            return AVERROR_PATCHWELCOME;
+        } else {
+            unsigned int tile_idx;
+            for (tile_idx = current->sh_slice_address; tile_idx <= current->sh_slice_address + current->sh_num_tiles_in_slice_minus1; tile_idx++) {
+                unsigned int tile_y, height;
+                tile_y = tile_idx / pps->num_tile_rows;
+                height = pps->pps_tile_row_height_minus1[FFMIN(tile_y, pps->pps_num_exp_tile_rows_minus1)] + 1;
+                num_entry_points += (sps->sps_entropy_coding_sync_enabled_flag ? height : 1);
+            }
+            num_entry_points--;
+        }
+        infer(num_entry_point_offsets, num_entry_points);
+        if (num_entry_points > H266_MAX_ENTRY_POINT_OFFSETS) {
+            av_log(ctx->log_ctx, AV_LOG_ERROR, "Too many entry points: "
+               "%"PRIu16".\n", current->num_entry_point_offsets);
+            return AVERROR_PATCHWELCOME;
+        }
+        if (num_entry_points > 0) {
+            ue(sh_entry_offset_len_minus1, 0, 31);
+            for (i = 0; i < num_entry_points; i++) {
+                ubs(current->sh_entry_offset_len_minus1, sh_entry_point_offset_minus1[i], 1, i);
+            }
+        }
+    }
+    CHECK(FUNC(byte_alignment)(ctx, rw));
+
+    return 0;
+}
+
+static int FUNC(sei)(CodedBitstreamContext *ctx, RWContext *rw,
+                     H266RawSEI *current, int prefix)
+{
+    return 0;
+}
diff --git a/libavcodec/cbs_internal.h b/libavcodec/cbs_internal.h
index faa847aad3..fadbbd702e 100644
--- a/libavcodec/cbs_internal.h
+++ b/libavcodec/cbs_internal.h
@@ -198,6 +198,7 @@ int ff_cbs_write_signed(CodedBitstreamContext *ctx, PutBitContext *pbc,
 extern const CodedBitstreamType ff_cbs_type_av1;
 extern const CodedBitstreamType ff_cbs_type_h264;
 extern const CodedBitstreamType ff_cbs_type_h265;
+extern const CodedBitstreamType ff_cbs_type_h266;
 extern const CodedBitstreamType ff_cbs_type_jpeg;
 extern const CodedBitstreamType ff_cbs_type_mpeg2;
 extern const CodedBitstreamType ff_cbs_type_vp9;
