lavc: Add coded bitstream read/write support for H.265

(cherry picked from commit 867381b8b51fa21fa2b8f071f508f3d39cc9c1f0)
(cherry picked from commit f763489364416bb6866adc4f4a96012dd2ca1bd0)
(cherry picked from commit 067a9ddeb8feff1f724856f0054930c55219f76b)

8 files changed, 2458 insertions, 3 deletions

diff --git a/configure b/configure
index 07c25e3dfa..e5bfbaabf2 100755
--- a/configure
+++ b/configure
@@ -2152,6 +2152,7 @@ CONFIG_EXTRA="
     cabac
     cbs
     cbs_h264
+    cbs_h265
     dirac_parse
     dvprofile
     exif
@@ -2406,6 +2407,7 @@ threads_if_any="$THREADS_LIST"
 
 # subsystems
 cbs_h264_select="cbs golomb"
+cbs_h265_select="cbs golomb"
 dct_select="rdft"
 dirac_parse_select="golomb"
 error_resilience_select="me_cmp"
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 245a44c7d5..39b7dd1e2f 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -61,6 +61,7 @@ OBJS-$(CONFIG_BSWAPDSP)                += bswapdsp.o
 OBJS-$(CONFIG_CABAC)                   += cabac.o
 OBJS-$(CONFIG_CBS)                     += cbs.o
 OBJS-$(CONFIG_CBS_H264)                += cbs_h2645.o h2645_parse.o
+OBJS-$(CONFIG_CBS_H265)                += cbs_h2645.o h2645_parse.o
 OBJS-$(CONFIG_CRYSTALHD)               += crystalhd.o
 OBJS-$(CONFIG_DCT)                     += dct.o dct32_fixed.o dct32_float.o
 OBJS-$(CONFIG_ERROR_RESILIENCE)        += error_resilience.o
diff --git a/libavcodec/cbs.c b/libavcodec/cbs.c
index f489d9806f..d7eb3033c4 100644
--- a/libavcodec/cbs.c
+++ b/libavcodec/cbs.c
@@ -31,6 +31,9 @@ static const CodedBitstreamType *cbs_type_table[] = {
 #if CONFIG_CBS_H264
     &ff_cbs_type_h264,
 #endif
+#if CONFIG_CBS_H265
+    &ff_cbs_type_h265,
+#endif
 };
 
 int ff_cbs_init(CodedBitstreamContext **ctx_ptr,
diff --git a/libavcodec/cbs.h b/libavcodec/cbs.h
index a64430667b..a367fd0bf6 100644
--- a/libavcodec/cbs.h
+++ b/libavcodec/cbs.h
@@ -44,6 +44,7 @@ struct CodedBitstreamType;
  * The codec-specific type of a bitstream unit.
  *
  * H.264 / AVC: nal_unit_type
+ * H.265 / HEVC: nal_unit_type
  */
 typedef uint32_t CodedBitstreamUnitType;
 
diff --git a/libavcodec/cbs_h2645.c b/libavcodec/cbs_h2645.c
index f03fd3ce72..bd2b5cbbf2 100644
--- a/libavcodec/cbs_h2645.c
+++ b/libavcodec/cbs_h2645.c
@@ -23,10 +23,12 @@
 #include "cbs.h"
 #include "cbs_internal.h"
 #include "cbs_h264.h"
+#include "cbs_h265.h"
 #include "golomb.h"
 #include "h264.h"
 #include "h264_sei.h"
 #include "h2645_parse.h"
+#include "hevc.h"
 
 
 static int cbs_read_ue_golomb(CodedBitstreamContext *ctx, GetBitContext *gbc,
@@ -235,6 +237,7 @@ static int cbs_write_se_golomb(CodedBitstreamContext *ctx, PutBitContext *pbc,
 
 #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 READ
@@ -297,6 +300,10 @@ static int cbs_h2645_read_more_rbsp_data(GetBitContext *gbc)
 #include "cbs_h264_syntax_template.c"
 #undef FUNC
 
+#define FUNC(name) FUNC_H265(READWRITE, name)
+#include "cbs_h265_syntax_template.c"
+#undef FUNC
+
 #undef READ
 #undef READWRITE
 #undef RWContext
@@ -366,6 +373,10 @@ static int cbs_h2645_read_more_rbsp_data(GetBitContext *gbc)
 #include "cbs_h264_syntax_template.c"
 #undef FUNC
 
+#define FUNC(name) FUNC_H265(READWRITE, name)
+#include "cbs_h265_syntax_template.c"
+#undef FUNC
+
 #undef WRITE
 #undef READWRITE
 #undef RWContext
@@ -426,6 +437,40 @@ static void cbs_h264_free_nal_unit(CodedBitstreamUnit *unit)
     av_freep(&unit->content);
 }
 
+static void cbs_h265_free_nal_unit(CodedBitstreamUnit *unit)
+{
+    switch (unit->type) {
+    case HEVC_NAL_VPS:
+        av_freep(&((H265RawVPS*)unit->content)->extension_data.data);
+        break;
+    case HEVC_NAL_SPS:
+        av_freep(&((H265RawSPS*)unit->content)->extension_data.data);
+        break;
+    case HEVC_NAL_PPS:
+        av_freep(&((H265RawPPS*)unit->content)->extension_data.data);
+        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:
+        av_freep(&((H265RawSlice*)unit->content)->data);
+        break;
+    }
+    av_freep(&unit->content);
+}
+
 static int cbs_h2645_fragment_add_nals(CodedBitstreamContext *ctx,
                                        CodedBitstreamFragment *frag,
                                        const H2645Packet *packet)
@@ -547,6 +592,58 @@ static int cbs_h2645_split_fragment(CodedBitstreamContext *ctx,
                    "header.\n", bytestream2_get_bytes_left(&gbc));
         }
 
+    } else if (header && frag->data[0] && codec_id == AV_CODEC_ID_HEVC) {
+        // HVCC header.
+        size_t size, start, end;
+        int i, j, nb_arrays, nal_unit_type, nb_nals, version;
+
+        priv->mp4 = 1;
+
+        bytestream2_init(&gbc, frag->data, frag->data_size);
+
+        if (bytestream2_get_bytes_left(&gbc) < 23)
+            return AVERROR_INVALIDDATA;
+
+        version = bytestream2_get_byte(&gbc);
+        if (version != 1) {
+            av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid HVCC header: "
+                   "first byte %u.", version);
+            return AVERROR_INVALIDDATA;
+        }
+
+        bytestream2_skip(&gbc, 20);
+        priv->nal_length_size = (bytestream2_get_byte(&gbc) & 3) + 1;
+
+        nb_arrays = bytestream2_get_byte(&gbc);
+        for (i = 0; i < nb_arrays; i++) {
+            nal_unit_type = bytestream2_get_byte(&gbc) & 0x3f;
+            nb_nals = bytestream2_get_be16(&gbc);
+
+            start = bytestream2_tell(&gbc);
+            for (j = 0; j < nb_nals; j++) {
+                if (bytestream2_get_bytes_left(&gbc) < 2)
+                    return AVERROR_INVALIDDATA;
+                size = bytestream2_get_be16(&gbc);
+                if (bytestream2_get_bytes_left(&gbc) < size)
+                    return AVERROR_INVALIDDATA;
+                bytestream2_skip(&gbc, size);
+            }
+            end = bytestream2_tell(&gbc);
+
+            err = ff_h2645_packet_split(&priv->read_packet,
+                                        frag->data + start, end - start,
+                                        ctx->log_ctx, 1, 2, AV_CODEC_ID_HEVC, 1);
+            if (err < 0) {
+                av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to split "
+                       "HVCC array %d (%d NAL units of type %d).\n",
+                       i, nb_nals, nal_unit_type);
+                return err;
+            }
+            err = cbs_h2645_fragment_add_nals(ctx, frag, &priv->read_packet);
+            if (err < 0)
+                return err;
+        }
+
     } else {
         // Annex B, or later MP4 with already-known parameters.
 
@@ -587,6 +684,9 @@ static int cbs_h26 ## h26n ## _replace_ ## ps_var(CodedBitstreamContext *ctx, \
 
 cbs_h2645_replace_ps(4, SPS, sps, seq_parameter_set_id)
 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)
 
 static int cbs_h264_read_nal_unit(CodedBitstreamContext *ctx,
                                   CodedBitstreamUnit *unit)
@@ -738,6 +838,153 @@ static int cbs_h264_read_nal_unit(CodedBitstreamContext *ctx,
     return 0;
 }
 
+static int cbs_h265_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;
+
+    switch (unit->type) {
+    case HEVC_NAL_VPS:
+        {
+            H265RawVPS *vps;
+
+            vps = av_mallocz(sizeof(*vps));
+            if (!vps)
+                return AVERROR(ENOMEM);
+            err = cbs_h265_read_vps(ctx, &gbc, vps);
+            if (err >= 0)
+                err = cbs_h265_replace_vps(ctx, vps);
+            if (err < 0) {
+                av_free(vps);
+                return err;
+            }
+
+            unit->content = vps;
+        }
+        break;
+    case HEVC_NAL_SPS:
+        {
+            H265RawSPS *sps;
+
+            sps = av_mallocz(sizeof(*sps));
+            if (!sps)
+                return AVERROR(ENOMEM);
+            err = cbs_h265_read_sps(ctx, &gbc, sps);
+            if (err >= 0)
+                err = cbs_h265_replace_sps(ctx, sps);
+            if (err < 0) {
+                av_free(sps);
+                return err;
+            }
+
+            unit->content = sps;
+        }
+        break;
+
+    case HEVC_NAL_PPS:
+        {
+            H265RawPPS *pps;
+
+            pps = av_mallocz(sizeof(*pps));
+            if (!pps)
+                return AVERROR(ENOMEM);
+            err = cbs_h265_read_pps(ctx, &gbc, pps);
+            if (err >= 0)
+                err = cbs_h265_replace_pps(ctx, pps);
+            if (err < 0) {
+                av_free(pps);
+                return err;
+            }
+
+            unit->content = pps;
+        }
+        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;
+            int pos, len;
+
+            slice = av_mallocz(sizeof(*slice));
+            if (!slice)
+                return AVERROR(ENOMEM);
+            err = cbs_h265_read_slice_segment_header(ctx, &gbc, &slice->header);
+            if (err < 0) {
+                av_free(slice);
+                return err;
+            }
+
+            pos = get_bits_count(&gbc);
+            len = unit->data_size;
+            if (!unit->data[len - 1]) {
+                int z;
+                for (z = 0; z < len && !unit->data[len - z - 1]; z++);
+                av_log(ctx->log_ctx, AV_LOG_DEBUG, "Deleted %d trailing zeroes "
+                       "from slice data.\n", z);
+                len -= z;
+            }
+
+            slice->data_size = len - pos / 8;
+            slice->data = av_malloc(slice->data_size +
+                                    AV_INPUT_BUFFER_PADDING_SIZE);
+            if (!slice->data) {
+                av_free(slice);
+                return AVERROR(ENOMEM);
+            }
+            memcpy(slice->data,
+                   unit->data + pos / 8, slice->data_size);
+            memset(slice->data + slice->data_size, 0,
+                   AV_INPUT_BUFFER_PADDING_SIZE);
+            slice->data_bit_start = pos % 8;
+
+            unit->content = slice;
+        }
+        break;
+
+    case HEVC_NAL_AUD:
+        {
+            H265RawAUD *aud;
+
+            aud = av_mallocz(sizeof(*aud));
+            if (!aud)
+                return AVERROR(ENOMEM);
+            err = cbs_h265_read_aud(ctx, &gbc, aud);
+            if (err < 0) {
+                av_free(aud);
+                return err;
+            }
+
+            unit->content = aud;
+        }
+        break;
+
+    default:
+        return AVERROR(ENOSYS);
+    }
+
+    return 0;
+}
+
 static int cbs_h264_write_nal_unit(CodedBitstreamContext *ctx,
                                    CodedBitstreamUnit *unit,
                                    PutBitContext *pbc)
@@ -850,6 +1097,127 @@ static int cbs_h264_write_nal_unit(CodedBitstreamContext *ctx,
     return 0;
 }
 
+static int cbs_h265_write_nal_unit(CodedBitstreamContext *ctx,
+                                   CodedBitstreamUnit *unit,
+                                   PutBitContext *pbc)
+{
+    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, vps);
+            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, sps);
+            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, pps);
+            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;
+            GetBitContext gbc;
+            int bits_left, end, zeroes;
+
+            err = cbs_h265_write_slice_segment_header(ctx, pbc, &slice->header);
+            if (err < 0)
+                return err;
+
+            if (slice->data) {
+                if (slice->data_size * 8 + 8 > put_bits_left(pbc))
+                    return AVERROR(ENOSPC);
+
+                init_get_bits(&gbc, slice->data, slice->data_size * 8);
+                skip_bits_long(&gbc, slice->data_bit_start);
+
+                // Copy in two-byte blocks, but stop before copying the
+                // rbsp_stop_one_bit in the final byte.
+                while (get_bits_left(&gbc) > 23)
+                    put_bits(pbc, 16, get_bits(&gbc, 16));
+
+                bits_left = get_bits_left(&gbc);
+                end = get_bits(&gbc, bits_left);
+
+                // rbsp_stop_one_bit must be present here.
+                av_assert0(end);
+                zeroes = ff_ctz(end);
+                if (bits_left > zeroes + 1)
+                    put_bits(pbc, bits_left - zeroes - 1,
+                             end >> (zeroes + 1));
+                put_bits(pbc, 1, 1);
+                while (put_bits_count(pbc) % 8 != 0)
+                    put_bits(pbc, 1, 0);
+            } 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;
+
+    default:
+        av_log(ctx->log_ctx, AV_LOG_ERROR, "Write unimplemented for "
+               "NAL unit type %"PRIu32".\n", unit->type);
+        return AVERROR_PATCHWELCOME;
+    }
+
+    return 0;
+}
+
 static int cbs_h2645_write_nal_unit(CodedBitstreamContext *ctx,
                                     CodedBitstreamUnit *unit)
 {
@@ -874,7 +1242,10 @@ static int cbs_h2645_write_nal_unit(CodedBitstreamContext *ctx,
 
     init_put_bits(&pbc, priv->write_buffer, priv->write_buffer_size);
 
-    err = cbs_h264_write_nal_unit(ctx, unit, &pbc);
+    if (codec_id == AV_CODEC_ID_H264)
+        err = cbs_h264_write_nal_unit(ctx, unit, &pbc);
+    else
+        err = cbs_h265_write_nal_unit(ctx, unit, &pbc);
 
     if (err == AVERROR(ENOSPC)) {
         // Overflow.
@@ -940,8 +1311,13 @@ static int cbs_h2645_assemble_fragment(CodedBitstreamContext *ctx,
                 frag->data_bit_padding = unit->data_bit_padding;
         }
 
-        if (unit->type == H264_NAL_SPS ||
-            unit->type == H264_NAL_PPS ||
+        if ((ctx->codec->codec_id == AV_CODEC_ID_H264 &&
+             (unit->type == H264_NAL_SPS ||
+              unit->type == H264_NAL_PPS)) ||
+            (ctx->codec->codec_id == AV_CODEC_ID_HEVC &&
+             (unit->type == HEVC_NAL_VPS ||
+              unit->type == HEVC_NAL_SPS ||
+              unit->type == HEVC_NAL_PPS)) ||
             i == 0 /* (Assume this is the start of an access unit.) */) {
             // zero_byte
             data[dp++] = 0;
@@ -995,6 +1371,23 @@ static void cbs_h264_close(CodedBitstreamContext *ctx)
         av_freep(&h264->pps[i]);
 }
 
+static void cbs_h265_close(CodedBitstreamContext *ctx)
+{
+    CodedBitstreamH265Context *h265 = ctx->priv_data;
+    int i;
+
+    ff_h2645_packet_uninit(&h265->common.read_packet);
+
+    av_freep(&h265->common.write_buffer);
+
+    for (i = 0; i < FF_ARRAY_ELEMS(h265->vps); i++)
+        av_freep(&h265->vps[i]);
+    for (i = 0; i < FF_ARRAY_ELEMS(h265->sps); i++)
+        av_freep(&h265->sps[i]);
+    for (i = 0; i < FF_ARRAY_ELEMS(h265->pps); i++)
+        av_freep(&h265->pps[i]);
+}
+
 const CodedBitstreamType ff_cbs_type_h264 = {
     .codec_id          = AV_CODEC_ID_H264,
 
@@ -1008,3 +1401,17 @@ const CodedBitstreamType ff_cbs_type_h264 = {
     .free_unit         = &cbs_h264_free_nal_unit,
     .close             = &cbs_h264_close,
 };
+
+const CodedBitstreamType ff_cbs_type_h265 = {
+    .codec_id          = AV_CODEC_ID_HEVC,
+
+    .priv_data_size    = sizeof(CodedBitstreamH265Context),
+
+    .split_fragment    = &cbs_h2645_split_fragment,
+    .read_unit         = &cbs_h265_read_nal_unit,
+    .write_unit        = &cbs_h2645_write_nal_unit,
+    .assemble_fragment = &cbs_h2645_assemble_fragment,
+
+    .free_unit         = &cbs_h265_free_nal_unit,
+    .close             = &cbs_h265_close,
+};
diff --git a/libavcodec/cbs_h265.h b/libavcodec/cbs_h265.h
new file mode 100644
index 0000000000..b4777cf6be
--- /dev/null
+++ b/libavcodec/cbs_h265.h
@@ -0,0 +1,537 @@
+/*
+ * 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_H265_H
+#define AVCODEC_CBS_H265_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "cbs_h2645.h"
+#include "hevc.h"
+
+
+typedef struct H265RawNALUnitHeader {
+    uint8_t forbidden_zero_bit;
+    uint8_t nal_unit_type;
+    uint8_t nuh_layer_id;
+    uint8_t nuh_temporal_id_plus1;
+} H265RawNALUnitHeader;
+
+typedef struct H265RawProfileTierLevel {
+    uint8_t general_profile_space;
+    uint8_t general_tier_flag;
+    uint8_t general_profile_idc;
+
+    uint8_t general_profile_compatibility_flag[32];
+
+    uint8_t general_progressive_source_flag;
+    uint8_t general_interlaced_source_flag;
+    uint8_t general_non_packed_constraint_flag;
+    uint8_t general_frame_only_constraint_flag;
+
+    uint8_t general_max_12bit_constraint_flag;
+    uint8_t general_max_10bit_constraint_flag;
+    uint8_t general_max_8bit_constraint_flag;
+    uint8_t general_max_422chroma_constraint_flag;
+    uint8_t general_max_420chroma_constraint_flag;
+    uint8_t general_max_monochrome_constraint_flag;
+    uint8_t general_intra_constraint_flag;
+    uint8_t general_one_picture_only_constraint_flag;
+    uint8_t general_lower_bit_rate_constraint_flag;
+    uint8_t general_max_14bit_constraint_flag;
+
+    uint8_t general_inbld_flag;
+
+    uint8_t general_level_idc;
+
+    uint8_t sub_layer_profile_present_flag[HEVC_MAX_SUB_LAYERS];
+    uint8_t sub_layer_level_present_flag[HEVC_MAX_SUB_LAYERS];
+
+    // TODO: much of that again for each sub-layer.
+} H265RawProfileTierLevel;
+
+typedef struct H265RawSubLayerHRDParameters {
+    uint32_t bit_rate_value_minus1[HEVC_MAX_CPB_CNT];
+    uint32_t cpb_size_value_minus1[HEVC_MAX_CPB_CNT];
+    uint32_t cpb_size_du_value_minus1[HEVC_MAX_CPB_CNT];
+    uint32_t bit_rate_du_value_minus1[HEVC_MAX_CPB_CNT];
+    uint8_t cbr_flag[HEVC_MAX_CPB_CNT];
+} H265RawSubLayerHRDParameters;
+
+typedef struct H265RawHRDParameters {
+    uint8_t nal_hrd_parameters_present_flag;
+    uint8_t vcl_hrd_parameters_present_flag;
+
+    uint8_t sub_pic_hrd_params_present_flag;
+    uint8_t tick_divisor_minus2;
+    uint8_t du_cpb_removal_delay_increment_length_minus1;
+    uint8_t sub_pic_cpb_params_in_pic_timing_sei_flag;
+    uint8_t dpb_output_delay_du_length_minus1;
+
+    uint8_t bit_rate_scale;
+    uint8_t cpb_size_scale;
+    uint8_t cpb_size_du_scale;
+
+    uint8_t initial_cpb_removal_delay_length_minus1;
+    uint8_t au_cpb_removal_delay_length_minus1;
+    uint8_t dpb_output_delay_length_minus1;
+
+    uint8_t fixed_pic_rate_general_flag[HEVC_MAX_SUB_LAYERS];
+    uint8_t fixed_pic_rate_within_cvs_flag[HEVC_MAX_SUB_LAYERS];
+    uint16_t elemental_duration_in_tc_minus1[HEVC_MAX_SUB_LAYERS];
+    uint8_t low_delay_hrd_flag[HEVC_MAX_SUB_LAYERS];
+    uint8_t cpb_cnt_minus1[HEVC_MAX_SUB_LAYERS];
+    H265RawSubLayerHRDParameters nal_sub_layer_hrd_parameters[HEVC_MAX_SUB_LAYERS];
+    H265RawSubLayerHRDParameters vcl_sub_layer_hrd_parameters[HEVC_MAX_SUB_LAYERS];
+} H265RawHRDParameters;
+
+typedef struct H265RawVUI {
+    uint8_t aspect_ratio_info_present_flag;
+    uint8_t aspect_ratio_idc;
+    uint16_t sar_width;
+    uint16_t sar_height;
+
+    uint8_t overscan_info_present_flag;
+    uint8_t overscan_appropriate_flag;
+
+    uint8_t video_signal_type_present_flag;
+    uint8_t video_format;
+    uint8_t video_full_range_flag;
+    uint8_t colour_description_present_flag;
+    uint8_t colour_primaries;
+    uint8_t transfer_characteristics;
+    uint8_t matrix_coefficients;
+
+    uint8_t chroma_loc_info_present_flag;
+    uint8_t chroma_sample_loc_type_top_field;
+    uint8_t chroma_sample_loc_type_bottom_field;
+
+    uint8_t neutral_chroma_indication_flag;
+    uint8_t field_seq_flag;
+    uint8_t frame_field_info_present_flag;
+
+    uint8_t default_display_window_flag;
+    uint16_t def_disp_win_left_offset;
+    uint16_t def_disp_win_right_offset;
+    uint16_t def_disp_win_top_offset;
+    uint16_t def_disp_win_bottom_offset;
+
+    uint8_t vui_timing_info_present_flag;
+    uint32_t vui_num_units_in_tick;
+    uint32_t vui_time_scale;
+    uint8_t vui_poc_proportional_to_timing_flag;
+    uint32_t vui_num_ticks_poc_diff_one_minus1;
+    uint8_t vui_hrd_parameters_present_flag;
+    H265RawHRDParameters hrd_parameters;
+
+    uint8_t bitstream_restriction_flag;
+    uint8_t tiles_fixed_structure_flag;
+    uint8_t motion_vectors_over_pic_boundaries_flag;
+    uint8_t restricted_ref_pic_lists_flag;
+    uint16_t min_spatial_segmentation_idc;
+    uint8_t max_bytes_per_pic_denom;
+    uint8_t max_bits_per_min_cu_denom;
+    uint8_t log2_max_mv_length_horizontal;
+    uint8_t log2_max_mv_length_vertical;
+} H265RawVUI;
+
+typedef struct H265RawPSExtensionData {
+    uint8_t *data;
+    size_t bit_length;
+} H265RawPSExtensionData;
+
+typedef struct H265RawVPS {
+    H265RawNALUnitHeader nal_unit_header;
+
+    uint8_t vps_video_parameter_set_id;
+
+    uint8_t vps_base_layer_internal_flag;
+    uint8_t vps_base_layer_available_flag;
+    uint8_t vps_max_layers_minus1;
+    uint8_t vps_max_sub_layers_minus1;
+    uint8_t vps_temporal_id_nesting_flag;
+
+    H265RawProfileTierLevel profile_tier_level;
+
+    uint8_t vps_sub_layer_ordering_info_present_flag;
+    uint8_t vps_max_dec_pic_buffering_minus1[HEVC_MAX_SUB_LAYERS];
+    uint8_t vps_max_num_reorder_pics[HEVC_MAX_SUB_LAYERS];
+    uint32_t vps_max_latency_increase_plus1[HEVC_MAX_SUB_LAYERS];
+
+    uint8_t vps_max_layer_id;
+    uint16_t vps_num_layer_sets_minus1;
+    uint8_t layer_id_included_flag[HEVC_MAX_LAYER_SETS][HEVC_MAX_LAYERS];
+
+    uint8_t vps_timing_info_present_flag;
+    uint32_t vps_num_units_in_tick;
+    uint32_t vps_time_scale;
+    uint8_t vps_poc_proportional_to_timing_flag;
+    uint32_t vps_num_ticks_poc_diff_one_minus1;
+    uint16_t vps_num_hrd_parameters;
+    uint16_t hrd_layer_set_idx[HEVC_MAX_LAYER_SETS];
+    uint8_t cprms_present_flag[HEVC_MAX_LAYER_SETS];
+    H265RawHRDParameters hrd_parameters[HEVC_MAX_LAYER_SETS];
+
+    uint8_t vps_extension_flag;
+    H265RawPSExtensionData extension_data;
+} H265RawVPS;
+
+typedef struct H265RawSTRefPicSet {
+    uint8_t inter_ref_pic_set_prediction_flag;
+
+    uint8_t delta_idx_minus1;
+    uint8_t delta_rps_sign;
+    uint16_t abs_delta_rps_minus1;
+
+    uint8_t used_by_curr_pic_flag[HEVC_MAX_REFS];
+    uint8_t use_delta_flag[HEVC_MAX_REFS];
+
+    uint8_t num_negative_pics;
+    uint8_t num_positive_pics;
+    uint16_t delta_poc_s0_minus1[HEVC_MAX_REFS];
+    uint8_t used_by_curr_pic_s0_flag[HEVC_MAX_REFS];
+    uint16_t delta_poc_s1_minus1[HEVC_MAX_REFS];
+    uint8_t used_by_curr_pic_s1_flag[HEVC_MAX_REFS];
+} H265RawSTRefPicSet;
+
+typedef struct H265RawScalingList {
+    uint8_t scaling_list_pred_mode_flag[4][6];
+    uint8_t scaling_list_pred_matrix_id_delta[4][6];
+    int16_t scaling_list_dc_coef_minus8[4][6];
+    int8_t scaling_list_delta_coeff[4][6][64];
+} H265RawScalingList;
+
+typedef struct H265RawSPS {
+    H265RawNALUnitHeader nal_unit_header;
+
+    uint8_t sps_video_parameter_set_id;
+
+    uint8_t sps_max_sub_layers_minus1;
+    uint8_t sps_temporal_id_nesting_flag;
+
+    H265RawProfileTierLevel profile_tier_level;
+
+    uint8_t sps_seq_parameter_set_id;
+
+    uint8_t chroma_format_idc;
+    uint8_t separate_colour_plane_flag;
+
+    uint16_t pic_width_in_luma_samples;
+    uint16_t pic_height_in_luma_samples;
+
+    uint8_t conformance_window_flag;
+    uint16_t conf_win_left_offset;
+    uint16_t conf_win_right_offset;
+    uint16_t conf_win_top_offset;
+    uint16_t conf_win_bottom_offset;
+
+    uint8_t bit_depth_luma_minus8;
+    uint8_t bit_depth_chroma_minus8;
+
+    uint8_t log2_max_pic_order_cnt_lsb_minus4;
+
+    uint8_t sps_sub_layer_ordering_info_present_flag;
+    uint8_t sps_max_dec_pic_buffering_minus1[HEVC_MAX_SUB_LAYERS];
+    uint8_t sps_max_num_reorder_pics[HEVC_MAX_SUB_LAYERS];
+    uint32_t sps_max_latency_increase_plus1[HEVC_MAX_SUB_LAYERS];
+
+    uint8_t log2_min_luma_coding_block_size_minus3;
+    uint8_t log2_diff_max_min_luma_coding_block_size;
+    uint8_t log2_min_luma_transform_block_size_minus2;
+    uint8_t log2_diff_max_min_luma_transform_block_size;
+    uint8_t max_transform_hierarchy_depth_inter;
+    uint8_t max_transform_hierarchy_depth_intra;
+
+    uint8_t scaling_list_enabled_flag;
+    uint8_t sps_scaling_list_data_present_flag;
+    H265RawScalingList scaling_list;
+
+    uint8_t amp_enabled_flag;
+    uint8_t sample_adaptive_offset_enabled_flag;
+
+    uint8_t pcm_enabled_flag;
+    uint8_t pcm_sample_bit_depth_luma_minus1;
+    uint8_t pcm_sample_bit_depth_chroma_minus1;
+    uint8_t log2_min_pcm_luma_coding_block_size_minus3;
+    uint8_t log2_diff_max_min_pcm_luma_coding_block_size;
+    uint8_t pcm_loop_filter_disabled_flag;
+
+    uint8_t num_short_term_ref_pic_sets;
+    H265RawSTRefPicSet st_ref_pic_set[HEVC_MAX_SHORT_TERM_REF_PIC_SETS];
+
+    uint8_t long_term_ref_pics_present_flag;
+    uint8_t num_long_term_ref_pics_sps;
+    uint16_t lt_ref_pic_poc_lsb_sps[HEVC_MAX_LONG_TERM_REF_PICS];
+    uint8_t used_by_curr_pic_lt_sps_flag[HEVC_MAX_LONG_TERM_REF_PICS];
+
+    uint8_t sps_temporal_mvp_enabled_flag;
+    uint8_t strong_intra_smoothing_enabled_flag;
+
+    uint8_t vui_parameters_present_flag;
+    H265RawVUI vui;
+
+    uint8_t sps_extension_present_flag;
+    uint8_t sps_range_extension_flag;
+    uint8_t sps_multilayer_extension_flag;
+    uint8_t sps_3d_extension_flag;
+    uint8_t sps_scc_extension_flag;
+    uint8_t sps_extension_4bits;
+
+    H265RawPSExtensionData extension_data;
+
+    // Range extension.
+    uint8_t transform_skip_rotation_enabled_flag;
+    uint8_t transform_skip_context_enabled_flag;
+    uint8_t implicit_rdpcm_enabled_flag;
+    uint8_t explicit_rdpcm_enabled_flag;
+    uint8_t extended_precision_processing_flag;
+    uint8_t intra_smoothing_disabled_flag;
+    uint8_t high_precision_offsets_enabled_flag;
+    uint8_t persistent_rice_adaptation_enabled_flag;
+    uint8_t cabac_bypass_alignment_enabled_flag;
+
+    // Screen content coding extension.
+    uint8_t sps_curr_pic_ref_enabled_flag;
+    uint8_t palette_mode_enabled_flag;
+    uint8_t palette_max_size;
+    uint8_t delta_palette_max_predictor_size;
+    uint8_t sps_palette_predictor_initializer_present_flag;
+    uint8_t sps_num_palette_predictor_initializer_minus1;
+    uint16_t sps_palette_predictor_initializers[3][128];
+
+    uint8_t motion_vector_resolution_control_idc;
+    uint8_t intra_boundary_filtering_disable_flag;
+} H265RawSPS;
+
+typedef struct H265RawPPS {
+    H265RawNALUnitHeader nal_unit_header;
+
+    uint8_t pps_pic_parameter_set_id;
+    uint8_t pps_seq_parameter_set_id;
+
+    uint8_t dependent_slice_segments_enabled_flag;
+    uint8_t output_flag_present_flag;
+    uint8_t num_extra_slice_header_bits;
+    uint8_t sign_data_hiding_enabled_flag;
+    uint8_t cabac_init_present_flag;
+
+    uint8_t num_ref_idx_l0_default_active_minus1;
+    uint8_t num_ref_idx_l1_default_active_minus1;
+
+    int8_t init_qp_minus26;
+
+    uint8_t constrained_intra_pred_flag;
+    uint8_t transform_skip_enabled_flag;
+    uint8_t cu_qp_delta_enabled_flag;
+    uint8_t diff_cu_qp_delta_depth;
+
+    int8_t pps_cb_qp_offset;
+    int8_t pps_cr_qp_offset;
+    uint8_t pps_slice_chroma_qp_offsets_present_flag;
+
+    uint8_t weighted_pred_flag;
+    uint8_t weighted_bipred_flag;
+
+    uint8_t transquant_bypass_enabled_flag;
+    uint8_t tiles_enabled_flag;
+    uint8_t entropy_coding_sync_enabled_flag;
+
+    uint8_t num_tile_columns_minus1;
+    uint8_t num_tile_rows_minus1;
+    uint8_t uniform_spacing_flag;
+    uint16_t column_width_minus1[HEVC_MAX_TILE_COLUMNS];
+    uint16_t row_height_minus1[HEVC_MAX_TILE_ROWS];
+    uint8_t loop_filter_across_tiles_enabled_flag;
+
+    uint8_t pps_loop_filter_across_slices_enabled_flag;
+    uint8_t deblocking_filter_control_present_flag;
+    uint8_t deblocking_filter_override_enabled_flag;
+    uint8_t pps_deblocking_filter_disabled_flag;
+    int8_t pps_beta_offset_div2;
+    int8_t pps_tc_offset_div2;
+
+    uint8_t pps_scaling_list_data_present_flag;
+    H265RawScalingList scaling_list;
+
+    uint8_t lists_modification_present_flag;
+    uint8_t log2_parallel_merge_level_minus2;
+
+    uint8_t slice_segment_header_extension_present_flag;
+
+    uint8_t pps_extension_present_flag;
+    uint8_t pps_range_extension_flag;
+    uint8_t pps_multilayer_extension_flag;
+    uint8_t pps_3d_extension_flag;
+    uint8_t pps_scc_extension_flag;
+    uint8_t pps_extension_4bits;
+
+    H265RawPSExtensionData extension_data;
+
+    // Range extension.
+    uint8_t log2_max_transform_skip_block_size_minus2;
+    uint8_t cross_component_prediction_enabled_flag;
+    uint8_t chroma_qp_offset_list_enabled_flag;
+    uint8_t diff_cu_chroma_qp_offset_depth;
+    uint8_t chroma_qp_offset_list_len_minus1;
+    int8_t cb_qp_offset_list[6];
+    int8_t cr_qp_offset_list[6];
+    uint8_t log2_sao_offset_scale_luma;
+    uint8_t log2_sao_offset_scale_chroma;
+
+    // Screen content coding extension.
+    uint8_t pps_curr_pic_ref_enabled_flag;
+    uint8_t residual_adaptive_colour_transform_enabled_flag;
+    uint8_t pps_slice_act_qp_offsets_present_flag;
+    int8_t pps_act_y_qp_offset_plus5;
+    int8_t pps_act_cb_qp_offset_plus5;
+    int8_t pps_act_cr_qp_offset_plus3;
+
+    uint8_t pps_palette_predictor_initializer_present_flag;
+    uint8_t pps_num_palette_predictor_initializer;
+    uint8_t monochrome_palette_flag;
+    uint8_t luma_bit_depth_entry_minus8;
+    uint8_t chroma_bit_depth_entry_minus8;
+    uint16_t pps_palette_predictor_initializers[3][128];
+} H265RawPPS;
+
+typedef struct H265RawAUD {
+    H265RawNALUnitHeader nal_unit_header;
+
+    uint8_t pic_type;
+} H265RawAUD;
+
+typedef struct  H265RawSliceHeader {
+    H265RawNALUnitHeader nal_unit_header;
+
+    uint8_t first_slice_segment_in_pic_flag;
+    uint8_t no_output_of_prior_pics_flag;
+    uint8_t slice_pic_parameter_set_id;
+
+    uint8_t dependent_slice_segment_flag;
+    uint16_t slice_segment_address;
+
+    uint8_t slice_reserved_flag[8];
+    uint8_t slice_type;
+
+    uint8_t pic_output_flag;
+    uint8_t colour_plane_id;
+
+    uint16_t slice_pic_order_cnt_lsb;
+
+    uint8_t short_term_ref_pic_set_sps_flag;
+    H265RawSTRefPicSet short_term_ref_pic_set;
+    uint8_t short_term_ref_pic_set_idx;
+
+    uint8_t num_long_term_sps;
+    uint8_t num_long_term_pics;
+    uint8_t lt_idx_sps[HEVC_MAX_REFS];
+    uint8_t poc_lsb_lt[HEVC_MAX_REFS];
+    uint8_t used_by_curr_pic_lt_flag[HEVC_MAX_REFS];
+    uint8_t delta_poc_msb_present_flag[HEVC_MAX_REFS];
+    uint32_t delta_poc_msb_cycle_lt[HEVC_MAX_REFS];
+
+    uint8_t slice_temporal_mvp_enabled_flag;
+
+    uint8_t slice_sao_luma_flag;
+    uint8_t slice_sao_chroma_flag;
+
+    uint8_t num_ref_idx_active_override_flag;
+    uint8_t num_ref_idx_l0_active_minus1;
+    uint8_t num_ref_idx_l1_active_minus1;
+
+    uint8_t ref_pic_list_modification_flag_l0;
+    uint8_t list_entry_l0[HEVC_MAX_REFS];
+    uint8_t ref_pic_list_modification_flag_l1;
+    uint8_t list_entry_l1[HEVC_MAX_REFS];
+
+    uint8_t mvd_l1_zero_flag;
+    uint8_t cabac_init_flag;
+    uint8_t collocated_from_l0_flag;
+    uint8_t collocated_ref_idx;
+
+    uint8_t luma_log2_weight_denom;
+    int8_t delta_chroma_log2_weight_denom;
+    uint8_t luma_weight_l0_flag[HEVC_MAX_REFS];
+    uint8_t chroma_weight_l0_flag[HEVC_MAX_REFS];
+    int8_t delta_luma_weight_l0[HEVC_MAX_REFS];
+    int16_t luma_offset_l0[HEVC_MAX_REFS];
+    int8_t delta_chroma_weight_l0[HEVC_MAX_REFS][2];
+    int16_t chroma_offset_l0[HEVC_MAX_REFS][2];
+    uint8_t luma_weight_l1_flag[HEVC_MAX_REFS];
+    uint8_t chroma_weight_l1_flag[HEVC_MAX_REFS];
+    int8_t delta_luma_weight_l1[HEVC_MAX_REFS];
+    int16_t luma_offset_l1[HEVC_MAX_REFS];
+    int8_t delta_chroma_weight_l1[HEVC_MAX_REFS][2];
+    int16_t chroma_offset_l1[HEVC_MAX_REFS][2];
+
+    uint8_t five_minus_max_num_merge_cand;
+    uint8_t use_integer_mv_flag;
+
+    int8_t slice_qp_delta;
+    int8_t slice_cb_qp_offset;
+    int8_t slice_cr_qp_offset;
+    int8_t slice_act_y_qp_offset;
+    int8_t slice_act_cb_qp_offset;
+    int8_t slice_act_cr_qp_offset;
+    uint8_t cu_chroma_qp_offset_enabled_flag;
+
+    uint8_t deblocking_filter_override_flag;
+    uint8_t slice_deblocking_filter_disabled_flag;
+    int8_t slice_beta_offset_div2;
+    int8_t slice_tc_offset_div2;
+    uint8_t slice_loop_filter_across_slices_enabled_flag;
+
+    uint16_t num_entry_point_offsets;
+    uint8_t offset_len_minus1;
+    uint32_t entry_point_offset_minus1[HEVC_MAX_ENTRY_POINT_OFFSETS];
+
+    uint16_t slice_segment_header_extension_length;
+    uint8_t slice_segment_header_extension_data_byte[256];
+} H265RawSliceHeader;
+
+
+typedef struct H265RawSlice {
+    H265RawSliceHeader header;
+
+    uint8_t *data;
+    size_t   data_size;
+    int      data_bit_start;
+} H265RawSlice;
+
+
+typedef struct CodedBitstreamH265Context {
+    // 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.
+    H265RawVPS *vps[HEVC_MAX_VPS_COUNT];
+    H265RawSPS *sps[HEVC_MAX_SPS_COUNT];
+    H265RawPPS *pps[HEVC_MAX_PPS_COUNT];
+
+    // 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 H265RawVPS *active_vps;
+    const H265RawSPS *active_sps;
+    const H265RawPPS *active_pps;
+} CodedBitstreamH265Context;
+
+
+#endif /* AVCODEC_CBS_H265_H */
diff --git a/libavcodec/cbs_h265_syntax_template.c b/libavcodec/cbs_h265_syntax_template.c
new file mode 100644
index 0000000000..dae7f2dd46
--- /dev/null
+++ b/libavcodec/cbs_h265_syntax_template.c
@@ -0,0 +1,1503 @@
+/*
+ * 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;
+    av_unused int one = 1, zero = 0;
+    xu(1, rbsp_stop_one_bit, one, 1, 1);
+    while (byte_alignment(rw) != 0)
+        xu(1, rbsp_alignment_zero_bit, zero, 0, 0);
+
+    return 0;
+}
+
+static int FUNC(nal_unit_header)(CodedBitstreamContext *ctx, RWContext *rw,
+                                 H265RawNALUnitHeader *current,
+                                 int expected_nal_unit_type)
+{
+    int err;
+
+    u(1, forbidden_zero_bit, 0, 0);
+
+    if (expected_nal_unit_type >= 0)
+        u(6, nal_unit_type, expected_nal_unit_type,
+                            expected_nal_unit_type);
+    else
+        u(6, nal_unit_type, 0, 63);
+
+    u(6, nuh_layer_id,          0, 62);
+    u(3, nuh_temporal_id_plus1, 1,  7);
+
+    return 0;
+}
+
+static int FUNC(byte_alignment)(CodedBitstreamContext *ctx, RWContext *rw)
+{
+    int err;
+    av_unused int one = 1, zero = 0;
+    xu(1, alignment_bit_equal_to_one, one, 1, 1);
+    while (byte_alignment(rw) != 0)
+        xu(1, alignment_bit_equal_to_zero, zero, 0, 0);
+
+    return 0;
+}
+
+static int FUNC(extension_data)(CodedBitstreamContext *ctx, RWContext *rw,
+                                H265RawPSExtensionData *current)
+{
+    int err;
+    size_t k;
+#ifdef READ
+    GetBitContext start;
+    uint8_t bit;
+    start = *rw;
+    for (k = 0; cbs_h2645_read_more_rbsp_data(rw); k++)
+        skip_bits(rw, 1);
+    current->bit_length = k;
+    if (k > 0) {
+        *rw = start;
+        allocate(current->data, (current->bit_length + 7) / 8);
+        for (k = 0; k < current->bit_length; k++) {
+            xu(1, extension_data, bit, 0, 1);
+            current->data[k / 8] |= bit << (7 - k % 8);
+        }
+    }
+#else
+    for (k = 0; k < current->bit_length; k++)
+        xu(1, extension_data, current->data[k / 8] >> (7 - k % 8), 0, 1);
+#endif
+    return 0;
+}
+
+static int FUNC(profile_tier_level)(CodedBitstreamContext *ctx, RWContext *rw,
+                                    H265RawProfileTierLevel *current,
+                                    int profile_present_flag,
+                                    int max_num_sub_layers_minus1)
+{
+    av_unused unsigned int zero = 0;
+    int err, i, j;
+
+    if (profile_present_flag) {
+        u(2, general_profile_space, 0, 0);
+        flag(general_tier_flag);
+        u(5, general_profile_idc, 0, 31);
+
+        for (j = 0; j < 32; j++)
+            flag(general_profile_compatibility_flag[j]);
+
+        flag(general_progressive_source_flag);
+        flag(general_interlaced_source_flag);
+        flag(general_non_packed_constraint_flag);
+        flag(general_frame_only_constraint_flag);
+
+#define profile_compatible(x) (current->general_profile_idc == (x) || \
+                               current->general_profile_compatibility_flag[x])
+        if (profile_compatible(4) || profile_compatible(5) ||
+            profile_compatible(6) || profile_compatible(7) ||
+            profile_compatible(8) || profile_compatible(9) ||
+            profile_compatible(10)) {
+            flag(general_max_12bit_constraint_flag);
+            flag(general_max_10bit_constraint_flag);
+            flag(general_max_8bit_constraint_flag);
+            flag(general_max_422chroma_constraint_flag);
+            flag(general_max_420chroma_constraint_flag);
+            flag(general_max_monochrome_constraint_flag);
+            flag(general_intra_constraint_flag);
+            flag(general_one_picture_only_constraint_flag);
+            flag(general_lower_bit_rate_constraint_flag);
+
+            if (profile_compatible(5) || profile_compatible(9) ||
+                profile_compatible(10)) {
+                flag(general_max_14bit_constraint_flag);
+                xu(24, general_reserved_zero_33bits, zero, 0, 0);
+                xu(9, general_reserved_zero_33bits, zero, 0, 0);
+            } else {
+                xu(24, general_reserved_zero_34bits, zero, 0, 0);
+                xu(10, general_reserved_zero_34bits, zero, 0, 0);
+            }
+        } else {
+            xu(24, general_reserved_zero_43bits, zero, 0, 0);
+            xu(19, general_reserved_zero_43bits, zero, 0, 0);
+        }
+
+        if (profile_compatible(1) || profile_compatible(2) ||
+            profile_compatible(3) || profile_compatible(4) ||
+            profile_compatible(5) || profile_compatible(9)) {
+            flag(general_inbld_flag);
+        } else {
+            xu(1, general_reserved_zero_bit, zero, 0, 0);
+        }
+#undef profile_compatible
+    }
+
+    u(8, general_level_idc, 0, 255);
+
+    for (i = 0; i < max_num_sub_layers_minus1; i++) {
+        flag(sub_layer_profile_present_flag[i]);
+        flag(sub_layer_level_present_flag[i]);
+    }
+
+    if (max_num_sub_layers_minus1 > 0) {
+        for (i = max_num_sub_layers_minus1; i < 8; i++) {
+            av_unused int zero = 0;
+            xu(2, reserved_zero_2bits, zero, 0, 0);
+        }
+    }
+
+    for (i = 0; i < max_num_sub_layers_minus1; i++) {
+        if (current->sub_layer_profile_present_flag[i])
+            return AVERROR_PATCHWELCOME;
+        if (current->sub_layer_level_present_flag[i])
+            return AVERROR_PATCHWELCOME;
+    }
+
+    return 0;
+}
+
+static int FUNC(sub_layer_hrd_parameters)(CodedBitstreamContext *ctx, RWContext *rw,
+                                          H265RawHRDParameters *hrd,
+                                          int nal, int sub_layer_id)
+{
+    H265RawSubLayerHRDParameters *current;
+    int err, i;
+
+    if (nal)
+        current = &hrd->nal_sub_layer_hrd_parameters[sub_layer_id];
+    else
+        current = &hrd->vcl_sub_layer_hrd_parameters[sub_layer_id];
+
+    for (i = 0; i <= hrd->cpb_cnt_minus1[sub_layer_id]; i++) {
+        ue(bit_rate_value_minus1[i], 0, UINT32_MAX - 1);
+        ue(cpb_size_value_minus1[i], 0, UINT32_MAX - 1);
+        if (hrd->sub_pic_hrd_params_present_flag) {
+            ue(cpb_size_du_value_minus1[i], 0, UINT32_MAX - 1);
+            ue(bit_rate_du_value_minus1[i], 0, UINT32_MAX - 1);
+        }
+        flag(cbr_flag[i]);
+    }
+
+    return 0;
+}
+
+static int FUNC(hrd_parameters)(CodedBitstreamContext *ctx, RWContext *rw,
+                                H265RawHRDParameters *current, int common_inf_present_flag,
+                                int max_num_sub_layers_minus1)
+{
+    int err, i;
+
+    if (common_inf_present_flag) {
+        flag(nal_hrd_parameters_present_flag);
+        flag(vcl_hrd_parameters_present_flag);
+
+        if (current->nal_hrd_parameters_present_flag ||
+            current->vcl_hrd_parameters_present_flag) {
+            flag(sub_pic_hrd_params_present_flag);
+            if (current->sub_pic_hrd_params_present_flag) {
+                u(8, tick_divisor_minus2, 0, 255);
+                u(5, du_cpb_removal_delay_increment_length_minus1, 0, 31);
+                flag(sub_pic_cpb_params_in_pic_timing_sei_flag);
+                u(5, dpb_output_delay_du_length_minus1, 0, 31);
+            }
+
+            u(4, bit_rate_scale, 0, 15);
+            u(4, cpb_size_scale, 0, 15);
+            if (current->sub_pic_hrd_params_present_flag)
+                u(4, cpb_size_du_scale, 0, 15);
+
+            u(5, initial_cpb_removal_delay_length_minus1, 0, 31);
+            u(5, au_cpb_removal_delay_length_minus1,      0, 31);
+            u(5, dpb_output_delay_length_minus1,          0, 31);
+        } else {
+            infer(sub_pic_hrd_params_present_flag, 0);
+
+            infer(initial_cpb_removal_delay_length_minus1, 23);
+            infer(au_cpb_removal_delay_length_minus1,      23);
+            infer(dpb_output_delay_length_minus1,          23);
+        }
+    }
+
+    for (i = 0; i <= max_num_sub_layers_minus1; i++) {
+        flag(fixed_pic_rate_general_flag[i]);
+
+        if (!current->fixed_pic_rate_general_flag[i])
+            flag(fixed_pic_rate_within_cvs_flag[i]);
+        else
+            infer(fixed_pic_rate_within_cvs_flag[i], 1);
+
+        if (current->fixed_pic_rate_within_cvs_flag[i]) {
+            ue(elemental_duration_in_tc_minus1[i], 0, 2047);
+            infer(low_delay_hrd_flag[i], 0);
+        } else
+            flag(low_delay_hrd_flag[i]);
+
+        if (!current->low_delay_hrd_flag[i])
+            ue(cpb_cnt_minus1[i], 0, 31);
+        else
+            infer(cpb_cnt_minus1[i], 0);
+
+        if (current->nal_hrd_parameters_present_flag)
+            CHECK(FUNC(sub_layer_hrd_parameters)(ctx, rw, current, 0, i));
+        if (current->vcl_hrd_parameters_present_flag)
+            CHECK(FUNC(sub_layer_hrd_parameters)(ctx, rw, current, 1, i));
+    }
+
+    return 0;
+}
+
+static int FUNC(vui_parameters)(CodedBitstreamContext *ctx, RWContext *rw,
+                                H265RawVUI *current, const H265RawSPS *sps)
+{
+    int err;
+
+    flag(aspect_ratio_info_present_flag);
+    if (current->aspect_ratio_info_present_flag) {
+        u(8, aspect_ratio_idc, 0, 255);
+        if (current->aspect_ratio_idc == 255) {
+            u(16, sar_width,  0, 65535);
+            u(16, sar_height, 0, 65535);
+        }
+    } else {
+        infer(aspect_ratio_idc, 0);
+    }
+
+    flag(overscan_info_present_flag);
+    if (current->overscan_info_present_flag)
+        flag(overscan_appropriate_flag);
+
+    flag(video_signal_type_present_flag);
+    if (current->video_signal_type_present_flag) {
+        u(3, video_format, 0, 7);
+        flag(video_full_range_flag);
+        flag(colour_description_present_flag);
+        if (current->colour_description_present_flag) {
+            u(8, colour_primaries,         0, 255);
+            u(8, transfer_characteristics, 0, 255);
+            u(8, matrix_coefficients,      0, 255);
+        } else {
+            infer(colour_primaries,         2);
+            infer(transfer_characteristics, 2);
+            infer(matrix_coefficients,      2);
+        }
+    } else {
+        infer(video_format,             5);
+        infer(video_full_range_flag,    0);
+        infer(colour_primaries,         2);
+        infer(transfer_characteristics, 2);
+        infer(matrix_coefficients,      2);
+    }
+
+    flag(chroma_loc_info_present_flag);
+    if (current->chroma_loc_info_present_flag) {
+        ue(chroma_sample_loc_type_top_field,    0, 5);
+        ue(chroma_sample_loc_type_bottom_field, 0, 5);
+    } else {
+        infer(chroma_sample_loc_type_top_field,    0);
+        infer(chroma_sample_loc_type_bottom_field, 0);
+    }
+
+    flag(neutral_chroma_indication_flag);
+    flag(field_seq_flag);
+    flag(frame_field_info_present_flag);
+
+    flag(default_display_window_flag);
+    if (current->default_display_window_flag) {
+        ue(def_disp_win_left_offset,   0, 16384);
+        ue(def_disp_win_right_offset,  0, 16384);
+        ue(def_disp_win_top_offset,    0, 16384);
+        ue(def_disp_win_bottom_offset, 0, 16384);
+    }
+
+    flag(vui_timing_info_present_flag);
+    if (current->vui_timing_info_present_flag) {
+        u(32, vui_num_units_in_tick, 1, UINT32_MAX);
+        u(32, vui_time_scale,        1, UINT32_MAX);
+        flag(vui_poc_proportional_to_timing_flag);
+        if (current->vui_poc_proportional_to_timing_flag)
+            ue(vui_num_ticks_poc_diff_one_minus1, 0, UINT32_MAX - 1);
+
+        flag(vui_hrd_parameters_present_flag);
+        if (current->vui_hrd_parameters_present_flag) {
+            CHECK(FUNC(hrd_parameters)(ctx, rw, &current->hrd_parameters,
+                                       1, sps->sps_max_sub_layers_minus1));
+        }
+    }
+
+    flag(bitstream_restriction_flag);
+    if (current->bitstream_restriction_flag) {
+        flag(tiles_fixed_structure_flag);
+        flag(motion_vectors_over_pic_boundaries_flag);
+        flag(restricted_ref_pic_lists_flag);
+        ue(min_spatial_segmentation_idc,  0, 4095);
+        ue(max_bytes_per_pic_denom,       0, 16);
+        ue(max_bits_per_min_cu_denom,     0, 16);
+        ue(log2_max_mv_length_horizontal, 0, 16);
+        ue(log2_max_mv_length_vertical,   0, 16);
+    } else {
+        infer(tiles_fixed_structure_flag,    0);
+        infer(motion_vectors_over_pic_boundaries_flag, 1);
+        infer(min_spatial_segmentation_idc,  0);
+        infer(max_bytes_per_pic_denom,       2);
+        infer(max_bits_per_min_cu_denom,     1);
+        infer(log2_max_mv_length_horizontal, 15);
+        infer(log2_max_mv_length_vertical,   15);
+    }
+
+    return 0;
+}
+
+static int FUNC(vps)(CodedBitstreamContext *ctx, RWContext *rw,
+                     H265RawVPS *current)
+{
+    int err, i, j;
+
+    HEADER("Video Parameter Set");
+
+    CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header, HEVC_NAL_VPS));
+
+    u(4, vps_video_parameter_set_id, 0, 15);
+
+    flag(vps_base_layer_internal_flag);
+    flag(vps_base_layer_available_flag);
+    u(6, vps_max_layers_minus1,     0, HEVC_MAX_LAYERS - 1);
+    u(3, vps_max_sub_layers_minus1, 0, HEVC_MAX_SUB_LAYERS - 1);
+    flag(vps_temporal_id_nesting_flag);
+
+    if (current->vps_max_sub_layers_minus1 == 0 &&
+        current->vps_temporal_id_nesting_flag != 1) {
+        av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid stream: "
+               "vps_temporal_id_nesting_flag must be 1 if "
+               "vps_max_sub_layers_minus1 is 0.\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    {
+        av_unused uint16_t ffff = 0xffff;
+        xu(16, vps_reserved_0xffff_16bits, ffff, 0xffff, 0xffff);
+    }
+
+    CHECK(FUNC(profile_tier_level)(ctx, rw, &current->profile_tier_level,
+                                   1, current->vps_max_sub_layers_minus1));
+
+    flag(vps_sub_layer_ordering_info_present_flag);
+    for (i = (current->vps_sub_layer_ordering_info_present_flag ?
+              0 : current->vps_max_sub_layers_minus1);
+         i <= current->vps_max_sub_layers_minus1; i++) {
+        ue(vps_max_dec_pic_buffering_minus1[i], 0, HEVC_MAX_DPB_SIZE - 1);
+        ue(vps_max_num_reorder_pics[i],         0, current->vps_max_dec_pic_buffering_minus1[i]);
+        ue(vps_max_latency_increase_plus1[i],   0, UINT32_MAX - 1);
+    }
+    if (!current->vps_sub_layer_ordering_info_present_flag) {
+        for (i = 0; i < current->vps_max_sub_layers_minus1; i++) {
+            infer(vps_max_dec_pic_buffering_minus1[i],
+                  current->vps_max_dec_pic_buffering_minus1[current->vps_max_sub_layers_minus1]);
+            infer(vps_max_num_reorder_pics[i],
+                  current->vps_max_num_reorder_pics[current->vps_max_sub_layers_minus1]);
+            infer(vps_max_latency_increase_plus1[i],
+                  current->vps_max_latency_increase_plus1[current->vps_max_sub_layers_minus1]);
+        }
+    }
+
+    u(6, vps_max_layer_id,        0, HEVC_MAX_LAYERS - 1);
+    ue(vps_num_layer_sets_minus1, 0, HEVC_MAX_LAYER_SETS - 1);
+    for (i = 1; i <= current->vps_num_layer_sets_minus1; i++) {
+        for (j = 0; j <= current->vps_max_layer_id; j++)
+            flag(layer_id_included_flag[i][j]);
+    }
+    for (j = 0; j <= current->vps_max_layer_id; j++)
+        infer(layer_id_included_flag[0][j], j == 0);
+
+    flag(vps_timing_info_present_flag);
+    if (current->vps_timing_info_present_flag) {
+        u(32, vps_num_units_in_tick, 1, UINT32_MAX);
+        u(32, vps_time_scale,        1, UINT32_MAX);
+        flag(vps_poc_proportional_to_timing_flag);
+        if (current->vps_poc_proportional_to_timing_flag)
+            ue(vps_num_ticks_poc_diff_one_minus1, 0, UINT32_MAX - 1);
+        ue(vps_num_hrd_parameters, 0, current->vps_num_layer_sets_minus1 + 1);
+        for (i = 0; i < current->vps_num_hrd_parameters; i++) {
+            ue(hrd_layer_set_idx[i],
+               current->vps_base_layer_internal_flag ? 0 : 1,
+               current->vps_num_layer_sets_minus1);
+            if (i > 0)
+                flag(cprms_present_flag[i]);
+            else
+                infer(cprms_present_flag[0], 1);
+
+            CHECK(FUNC(hrd_parameters)(ctx, rw, &current->hrd_parameters[i],
+                                       current->cprms_present_flag[i],
+                                       current->vps_max_sub_layers_minus1));
+        }
+    }
+
+    flag(vps_extension_flag);
+    if (current->vps_extension_flag)
+        CHECK(FUNC(extension_data)(ctx, rw, &current->extension_data));
+
+    CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
+
+    return 0;
+}
+
+static int FUNC(st_ref_pic_set)(CodedBitstreamContext *ctx, RWContext *rw,
+                                H265RawSTRefPicSet *current, int st_rps_idx,
+                                const H265RawSPS *sps)
+{
+    int err, i, j;
+
+    if (st_rps_idx != 0)
+        flag(inter_ref_pic_set_prediction_flag);
+    else
+        infer(inter_ref_pic_set_prediction_flag, 0);
+
+    if (current->inter_ref_pic_set_prediction_flag) {
+        unsigned int ref_rps_idx, num_delta_pocs;
+        const H265RawSTRefPicSet *ref;
+        int delta_rps, d_poc;
+        int ref_delta_poc_s0[HEVC_MAX_REFS], ref_delta_poc_s1[HEVC_MAX_REFS];
+        int delta_poc_s0[HEVC_MAX_REFS], delta_poc_s1[HEVC_MAX_REFS];
+        uint8_t used_by_curr_pic_s0[HEVC_MAX_REFS],
+                used_by_curr_pic_s1[HEVC_MAX_REFS];
+
+        if (st_rps_idx == sps->num_short_term_ref_pic_sets)
+            ue(delta_idx_minus1, 0, st_rps_idx - 1);
+        else
+            infer(delta_idx_minus1, 0);
+
+        ref_rps_idx = st_rps_idx - (current->delta_idx_minus1 + 1);
+        ref = &sps->st_ref_pic_set[ref_rps_idx];
+        num_delta_pocs = ref->num_negative_pics + ref->num_positive_pics;
+
+        flag(delta_rps_sign);
+        ue(abs_delta_rps_minus1, 0, INT16_MAX);
+        delta_rps = (1 - 2 * current->delta_rps_sign) *
+            (current->abs_delta_rps_minus1 + 1);
+
+        for (j = 0; j <= num_delta_pocs; j++) {
+            flag(used_by_curr_pic_flag[j]);
+            if (!current->used_by_curr_pic_flag[j])
+                flag(use_delta_flag[j]);
+            else
+                infer(use_delta_flag[j], 1);
+        }
+
+        // Since the stored form of an RPS here is actually the delta-step
+        // form used when inter_ref_pic_set_prediction_flag is not set, we
+        // need to reconstruct that here in order to be able to refer to
+        // the RPS later (which is required for parsing, because we don't
+        // even know what syntax elements appear without it).  Therefore,
+        // this code takes the delta-step form of the reference set, turns
+        // it into the delta-array form, applies the prediction process of
+        // 7.4.8, converts the result back to the delta-step form, and
+        // stores that as the current set for future use.  Note that the
+        // inferences here mean that writers using prediction will need
+        // to fill in the delta-step values correctly as well - since the
+        // whole RPS prediction process is somewhat overly sophisticated,
+        // this hopefully forms a useful check for them to ensure their
+        // predicted form actually matches what was intended rather than
+        // an onerous additional requirement.
+
+        d_poc = 0;
+        for (i = 0; i < ref->num_negative_pics; i++) {
+            d_poc -= ref->delta_poc_s0_minus1[i] + 1;
+            ref_delta_poc_s0[i] = d_poc;
+        }
+        d_poc = 0;
+        for (i = 0; i < ref->num_positive_pics; i++) {
+            d_poc += ref->delta_poc_s1_minus1[i] + 1;
+            ref_delta_poc_s1[i] = d_poc;
+        }
+
+        i = 0;
+        for (j = ref->num_positive_pics - 1; j >= 0; j--) {
+            d_poc = ref_delta_poc_s1[j] + delta_rps;
+            if (d_poc < 0 && current->use_delta_flag[ref->num_negative_pics + j]) {
+                delta_poc_s0[i] = d_poc;
+                used_by_curr_pic_s0[i++] =
+                    current->used_by_curr_pic_flag[ref->num_negative_pics + j];
+            }
+        }
+        if (delta_rps < 0 && current->use_delta_flag[num_delta_pocs]) {
+            delta_poc_s0[i] = delta_rps;
+            used_by_curr_pic_s0[i++] =
+                current->used_by_curr_pic_flag[num_delta_pocs];
+        }
+        for (j = 0; j < ref->num_negative_pics; j++) {
+            d_poc = ref_delta_poc_s0[j] + delta_rps;
+            if (d_poc < 0 && current->use_delta_flag[j]) {
+                delta_poc_s0[i] = d_poc;
+                used_by_curr_pic_s0[i++] = current->used_by_curr_pic_flag[j];
+            }
+        }
+
+        infer(num_negative_pics, i);
+        for (i = 0; i < current->num_negative_pics; i++) {
+            infer(delta_poc_s0_minus1[i],
+                  -(delta_poc_s0[i] - (i == 0 ? 0 : delta_poc_s0[i - 1])) - 1);
+            infer(used_by_curr_pic_s0_flag[i], used_by_curr_pic_s0[i]);
+        }
+
+        i = 0;
+        for (j = ref->num_negative_pics - 1; j >= 0; j--) {
+            d_poc = ref_delta_poc_s0[j] + delta_rps;
+            if (d_poc > 0 && current->use_delta_flag[j]) {
+                delta_poc_s1[i] = d_poc;
+                used_by_curr_pic_s1[i++] = current->used_by_curr_pic_flag[j];
+            }
+        }
+        if (delta_rps > 0 && current->use_delta_flag[num_delta_pocs]) {
+            delta_poc_s1[i] = delta_rps;
+            used_by_curr_pic_s1[i++] =
+                current->used_by_curr_pic_flag[num_delta_pocs];
+        }
+        for (j = 0; j < ref->num_positive_pics; j++) {
+            d_poc = ref_delta_poc_s1[j] + delta_rps;
+            if (d_poc > 0 && current->use_delta_flag[ref->num_negative_pics + j]) {
+                delta_poc_s1[i] = d_poc;
+                used_by_curr_pic_s1[i++] =
+                    current->used_by_curr_pic_flag[ref->num_negative_pics + j];
+            }
+        }
+
+        infer(num_positive_pics, i);
+        for (i = 0; i < current->num_positive_pics; i++) {
+            infer(delta_poc_s1_minus1[i],
+                  delta_poc_s1[i] - (i == 0 ? 0 : delta_poc_s1[i - 1]) - 1);
+            infer(used_by_curr_pic_s1_flag[i], used_by_curr_pic_s1[i]);
+        }
+
+    } else {
+        ue(num_negative_pics, 0, 15);
+        ue(num_positive_pics, 0, 15 - current->num_negative_pics);
+
+        for (i = 0; i < current->num_negative_pics; i++) {
+            ue(delta_poc_s0_minus1[i], 0, INT16_MAX);
+            flag(used_by_curr_pic_s0_flag[i]);
+        }
+
+        for (i = 0; i < current->num_positive_pics; i++) {
+            ue(delta_poc_s1_minus1[i], 0, INT16_MAX);
+            flag(used_by_curr_pic_s1_flag[i]);
+        }
+    }
+
+    return 0;
+}
+
+static int FUNC(scaling_list_data)(CodedBitstreamContext *ctx, RWContext *rw,
+                                   H265RawScalingList *current)
+{
+    int sizeId, matrixId;
+    int err, n, i;
+
+    for (sizeId = 0; sizeId < 4; sizeId++) {
+        for (matrixId = 0; matrixId < 6; matrixId += (sizeId == 3 ? 3 : 1)) {
+            flag(scaling_list_pred_mode_flag[sizeId][matrixId]);
+            if (!current->scaling_list_pred_mode_flag[sizeId][matrixId]) {
+                ue(scaling_list_pred_matrix_id_delta[sizeId][matrixId],
+                   0, sizeId == 3 ? matrixId / 3 : matrixId);
+            } else {
+                n = FFMIN(64, 1 << (4 + (sizeId << 1)));
+                if (sizeId > 1)
+                    se(scaling_list_dc_coef_minus8[sizeId - 2][matrixId], -7, +247);
+                for (i = 0; i < n; i++) {
+                    xse(scaling_list_delta_coeff,
+                        current->scaling_list_delta_coeff[sizeId][matrixId][i],
+                        -128, +127);
+                }
+            }
+        }
+    }
+
+    return 0;
+}
+
+static int FUNC(sps_range_extension)(CodedBitstreamContext *ctx, RWContext *rw,
+                                     H265RawSPS *current)
+{
+    int err;
+
+    flag(transform_skip_rotation_enabled_flag);
+    flag(transform_skip_context_enabled_flag);
+    flag(implicit_rdpcm_enabled_flag);
+    flag(explicit_rdpcm_enabled_flag);
+    flag(extended_precision_processing_flag);
+    flag(intra_smoothing_disabled_flag);
+    flag(high_precision_offsets_enabled_flag);
+    flag(persistent_rice_adaptation_enabled_flag);
+    flag(cabac_bypass_alignment_enabled_flag);
+
+    return 0;
+}
+
+static int FUNC(sps_scc_extension)(CodedBitstreamContext *ctx, RWContext *rw,
+                                   H265RawSPS *current)
+{
+    int err, comp, i;
+
+    flag(sps_curr_pic_ref_enabled_flag);
+
+    flag(palette_mode_enabled_flag);
+    if (current->palette_mode_enabled_flag) {
+        ue(palette_max_size, 0, 64);
+        ue(delta_palette_max_predictor_size, 0, 128);
+
+        flag(sps_palette_predictor_initializer_present_flag);
+        if (current->sps_palette_predictor_initializer_present_flag) {
+            ue(sps_num_palette_predictor_initializer_minus1, 0, 128);
+            for (comp = 0; comp < (current->chroma_format_idc ? 3 : 1); comp++) {
+                int bit_depth = comp == 0 ? current->bit_depth_luma_minus8 + 8
+                                          : current->bit_depth_chroma_minus8 + 8;
+                for (i = 0; i <= current->sps_num_palette_predictor_initializer_minus1; i++)
+                    u(bit_depth, sps_palette_predictor_initializers[comp][i],
+                      0, (1 << bit_depth) - 1);
+            }
+        }
+    }
+
+    u(2, motion_vector_resolution_control_idc, 0, 2);
+    flag(intra_boundary_filtering_disable_flag);
+
+    return 0;
+}
+
+static int FUNC(sps)(CodedBitstreamContext *ctx, RWContext *rw,
+                     H265RawSPS *current)
+{
+    CodedBitstreamH265Context *h265 = ctx->priv_data;
+    const H265RawVPS *vps;
+    int err, i;
+    unsigned int min_cb_log2_size_y, ctb_log2_size_y,
+                 min_cb_size_y,   min_tb_log2_size_y;
+
+    HEADER("Sequence Parameter Set");
+
+    CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header, HEVC_NAL_SPS));
+
+    u(4, sps_video_parameter_set_id, 0, 15);
+    h265->active_vps = vps = h265->vps[current->sps_video_parameter_set_id];
+
+    u(3, sps_max_sub_layers_minus1, 0, HEVC_MAX_SUB_LAYERS - 1);
+    flag(sps_temporal_id_nesting_flag);
+    if (vps) {
+        if (vps->vps_max_sub_layers_minus1 > current->sps_max_sub_layers_minus1) {
+            av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid stream: "
+                   "sps_max_sub_layers_minus1 (%d) must be less than or equal to "
+                   "vps_max_sub_layers_minus1 (%d).\n",
+                   vps->vps_max_sub_layers_minus1,
+                   current->sps_max_sub_layers_minus1);
+            return AVERROR_INVALIDDATA;
+        }
+        if (vps->vps_temporal_id_nesting_flag &&
+            !current->sps_temporal_id_nesting_flag) {
+            av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid stream: "
+                   "sps_temporal_id_nesting_flag must be 1 if "
+                   "vps_temporal_id_nesting_flag is 1.\n");
+            return AVERROR_INVALIDDATA;
+        }
+    }
+
+    CHECK(FUNC(profile_tier_level)(ctx, rw, &current->profile_tier_level,
+                                   1, current->sps_max_sub_layers_minus1));
+
+    ue(sps_seq_parameter_set_id, 0, 15);
+
+    ue(chroma_format_idc, 0, 3);
+    if (current->chroma_format_idc == 3)
+        flag(separate_colour_plane_flag);
+    else
+        infer(separate_colour_plane_flag, 0);
+
+    ue(pic_width_in_luma_samples,  1, HEVC_MAX_WIDTH);
+    ue(pic_height_in_luma_samples, 1, HEVC_MAX_HEIGHT);
+
+    flag(conformance_window_flag);
+    if (current->conformance_window_flag) {
+        ue(conf_win_left_offset,   0, current->pic_width_in_luma_samples);
+        ue(conf_win_right_offset,  0, current->pic_width_in_luma_samples);
+        ue(conf_win_top_offset,    0, current->pic_height_in_luma_samples);
+        ue(conf_win_bottom_offset, 0, current->pic_height_in_luma_samples);
+    } else {
+        infer(conf_win_left_offset,   0);
+        infer(conf_win_right_offset,  0);
+        infer(conf_win_top_offset,    0);
+        infer(conf_win_bottom_offset, 0);
+    }
+
+    ue(bit_depth_luma_minus8,   0, 8);
+    ue(bit_depth_chroma_minus8, 0, 8);
+
+    ue(log2_max_pic_order_cnt_lsb_minus4, 0, 12);
+
+    flag(sps_sub_layer_ordering_info_present_flag);
+    for (i = (current->sps_sub_layer_ordering_info_present_flag ?
+              0 : current->sps_max_sub_layers_minus1);
+         i <= current->sps_max_sub_layers_minus1; i++) {
+        ue(sps_max_dec_pic_buffering_minus1[i], 0, HEVC_MAX_DPB_SIZE - 1);
+        ue(sps_max_num_reorder_pics[i],         0, current->sps_max_dec_pic_buffering_minus1[i]);
+        ue(sps_max_latency_increase_plus1[i],   0, UINT32_MAX - 1);
+    }
+    if (!current->sps_sub_layer_ordering_info_present_flag) {
+        for (i = 0; i < current->sps_max_sub_layers_minus1; i++) {
+            infer(sps_max_dec_pic_buffering_minus1[i],
+                  current->sps_max_dec_pic_buffering_minus1[current->sps_max_sub_layers_minus1]);
+            infer(sps_max_num_reorder_pics[i],
+                  current->sps_max_num_reorder_pics[current->sps_max_sub_layers_minus1]);
+            infer(sps_max_latency_increase_plus1[i],
+                  current->sps_max_latency_increase_plus1[current->sps_max_sub_layers_minus1]);
+        }
+    }
+
+    ue(log2_min_luma_coding_block_size_minus3,   0, 3);
+    min_cb_log2_size_y = current->log2_min_luma_coding_block_size_minus3 + 3;
+
+    ue(log2_diff_max_min_luma_coding_block_size, 0, 3);
+    ctb_log2_size_y = min_cb_log2_size_y +
+        current->log2_diff_max_min_luma_coding_block_size;
+
+    min_cb_size_y = 1 << min_cb_log2_size_y;
+    if (current->pic_width_in_luma_samples  % min_cb_size_y ||
+        current->pic_height_in_luma_samples % min_cb_size_y) {
+        av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid dimensions: %ux%u not divisible "
+               "by MinCbSizeY = %u.\n", current->pic_width_in_luma_samples,
+               current->pic_height_in_luma_samples, min_cb_size_y);
+        return AVERROR_INVALIDDATA;
+    }
+
+    ue(log2_min_luma_transform_block_size_minus2, 0, min_cb_log2_size_y - 3);
+    min_tb_log2_size_y = current->log2_min_luma_transform_block_size_minus2 + 2;
+
+    ue(log2_diff_max_min_luma_transform_block_size,
+       0, FFMIN(ctb_log2_size_y, 5) - min_tb_log2_size_y);
+
+    ue(max_transform_hierarchy_depth_inter,
+       0, ctb_log2_size_y - min_tb_log2_size_y);
+    ue(max_transform_hierarchy_depth_intra,
+       0, ctb_log2_size_y - min_tb_log2_size_y);
+
+    flag(scaling_list_enabled_flag);
+    if (current->scaling_list_enabled_flag) {
+        flag(sps_scaling_list_data_present_flag);
+        if (current->sps_scaling_list_data_present_flag)
+            CHECK(FUNC(scaling_list_data)(ctx, rw, &current->scaling_list));
+    } else {
+        infer(sps_scaling_list_data_present_flag, 0);
+    }
+
+    flag(amp_enabled_flag);
+    flag(sample_adaptive_offset_enabled_flag);
+
+    flag(pcm_enabled_flag);
+    if (current->pcm_enabled_flag) {
+        u(4, pcm_sample_bit_depth_luma_minus1,
+          0, current->bit_depth_luma_minus8 + 8 - 1);
+        u(4, pcm_sample_bit_depth_chroma_minus1,
+          0, current->bit_depth_chroma_minus8 + 8 - 1);
+
+        ue(log2_min_pcm_luma_coding_block_size_minus3,
+           FFMIN(min_cb_log2_size_y, 5) - 3, FFMIN(ctb_log2_size_y, 5) - 3);
+        ue(log2_diff_max_min_pcm_luma_coding_block_size,
+           0, FFMIN(ctb_log2_size_y, 5) - (current->log2_min_pcm_luma_coding_block_size_minus3 + 3));
+
+        flag(pcm_loop_filter_disabled_flag);
+    }
+
+    ue(num_short_term_ref_pic_sets, 0, HEVC_MAX_SHORT_TERM_REF_PIC_SETS);
+    for (i = 0; i < current->num_short_term_ref_pic_sets; i++)
+        CHECK(FUNC(st_ref_pic_set)(ctx, rw, &current->st_ref_pic_set[i], i, current));
+
+    flag(long_term_ref_pics_present_flag);
+    if (current->long_term_ref_pics_present_flag) {
+        ue(num_long_term_ref_pics_sps, 0, HEVC_MAX_LONG_TERM_REF_PICS);
+        for (i = 0; i < current->num_long_term_ref_pics_sps; i++) {
+            u(current->log2_max_pic_order_cnt_lsb_minus4 + 4,
+              lt_ref_pic_poc_lsb_sps[i],
+              0, (1 << (current->log2_max_pic_order_cnt_lsb_minus4 + 4)) - 1);
+            flag(used_by_curr_pic_lt_sps_flag[i]);
+        }
+    }
+
+    flag(sps_temporal_mvp_enabled_flag);
+    flag(strong_intra_smoothing_enabled_flag);
+
+    flag(vui_parameters_present_flag);
+    if (current->vui_parameters_present_flag)
+        CHECK(FUNC(vui_parameters)(ctx, rw, &current->vui, current));
+
+    flag(sps_extension_present_flag);
+    if (current->sps_extension_present_flag) {
+        flag(sps_range_extension_flag);
+        flag(sps_multilayer_extension_flag);
+        flag(sps_3d_extension_flag);
+        flag(sps_scc_extension_flag);
+        u(4, sps_extension_4bits, 0, (1 << 4) - 1);
+    }
+
+    if (current->sps_range_extension_flag)
+        CHECK(FUNC(sps_range_extension)(ctx, rw, current));
+    if (current->sps_multilayer_extension_flag)
+        return AVERROR_PATCHWELCOME;
+    if (current->sps_3d_extension_flag)
+        return AVERROR_PATCHWELCOME;
+    if (current->sps_scc_extension_flag)
+        CHECK(FUNC(sps_scc_extension)(ctx, rw, current));
+    if (current->sps_extension_4bits)
+        CHECK(FUNC(extension_data)(ctx, rw, &current->extension_data));
+
+    CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
+
+    return 0;
+}
+
+static int FUNC(pps_range_extension)(CodedBitstreamContext *ctx, RWContext *rw,
+                                     H265RawPPS *current)
+{
+    CodedBitstreamH265Context *h265 = ctx->priv_data;
+    const H265RawSPS *sps = h265->active_sps;
+    int err, i;
+
+    if (current->transform_skip_enabled_flag)
+        ue(log2_max_transform_skip_block_size_minus2, 0, 3);
+    flag(cross_component_prediction_enabled_flag);
+
+    flag(chroma_qp_offset_list_enabled_flag);
+    if (current->chroma_qp_offset_list_enabled_flag) {
+        ue(diff_cu_chroma_qp_offset_depth,
+           0, sps->log2_diff_max_min_luma_coding_block_size);
+        ue(chroma_qp_offset_list_len_minus1, 0, 5);
+        for (i = 0; i <= current->chroma_qp_offset_list_len_minus1; i++) {
+            se(cb_qp_offset_list[i], -12, +12);
+            se(cr_qp_offset_list[i], -12, +12);
+        }
+    }
+
+    ue(log2_sao_offset_scale_luma,   0, FFMAX(0, sps->bit_depth_luma_minus8   - 2));
+    ue(log2_sao_offset_scale_chroma, 0, FFMAX(0, sps->bit_depth_chroma_minus8 - 2));
+
+    return 0;
+}
+
+static int FUNC(pps_scc_extension)(CodedBitstreamContext *ctx, RWContext *rw,
+                                   H265RawPPS *current)
+{
+    int err, comp, i;
+
+    flag(pps_curr_pic_ref_enabled_flag);
+
+    flag(residual_adaptive_colour_transform_enabled_flag);
+    if (current->residual_adaptive_colour_transform_enabled_flag) {
+        flag(pps_slice_act_qp_offsets_present_flag);
+        se(pps_act_y_qp_offset_plus5,  -7, +17);
+        se(pps_act_cb_qp_offset_plus5, -7, +17);
+        se(pps_act_cr_qp_offset_plus3, -9, +15);
+    } else {
+        infer(pps_slice_act_qp_offsets_present_flag, 0);
+        infer(pps_act_y_qp_offset_plus5,  0);
+        infer(pps_act_cb_qp_offset_plus5, 0);
+        infer(pps_act_cr_qp_offset_plus3, 0);
+    }
+
+    flag(pps_palette_predictor_initializer_present_flag);
+    if (current->pps_palette_predictor_initializer_present_flag) {
+        ue(pps_num_palette_predictor_initializer, 0, 128);
+        if (current->pps_num_palette_predictor_initializer > 0) {
+            flag(monochrome_palette_flag);
+            ue(luma_bit_depth_entry_minus8, 0, 8);
+            if (!current->monochrome_palette_flag)
+                ue(chroma_bit_depth_entry_minus8, 0, 8);
+            for (comp = 0; comp < (current->monochrome_palette_flag ? 1 : 3); comp++) {
+                int bit_depth = comp == 0 ? current->luma_bit_depth_entry_minus8 + 8
+                                          : current->chroma_bit_depth_entry_minus8 + 8;
+                for (i = 0; i < current->pps_num_palette_predictor_initializer; i++)
+                    u(bit_depth, pps_palette_predictor_initializers[comp][i],
+                      0, (1 << bit_depth) - 1);
+            }
+        }
+    }
+
+    return 0;
+}
+
+static int FUNC(pps)(CodedBitstreamContext *ctx, RWContext *rw,
+                     H265RawPPS *current)
+{
+    CodedBitstreamH265Context *h265 = ctx->priv_data;
+    const H265RawSPS *sps;
+    int err, i;
+
+    HEADER("Picture Parameter Set");
+
+    CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header, HEVC_NAL_PPS));
+
+    ue(pps_pic_parameter_set_id, 0, 63);
+    ue(pps_seq_parameter_set_id, 0, 15);
+    sps = h265->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;
+    }
+    h265->active_sps = sps;
+
+    flag(dependent_slice_segments_enabled_flag);
+    flag(output_flag_present_flag);
+    u(3, num_extra_slice_header_bits, 0, 7);
+    flag(sign_data_hiding_enabled_flag);
+    flag(cabac_init_present_flag);
+
+    ue(num_ref_idx_l0_default_active_minus1, 0, 14);
+    ue(num_ref_idx_l1_default_active_minus1, 0, 14);
+
+    se(init_qp_minus26, -(26 + 6 * sps->bit_depth_luma_minus8), +25);
+
+    flag(constrained_intra_pred_flag);
+    flag(transform_skip_enabled_flag);
+    flag(cu_qp_delta_enabled_flag);
+    if (current->cu_qp_delta_enabled_flag)
+        ue(diff_cu_qp_delta_depth,
+           0, sps->log2_diff_max_min_luma_coding_block_size);
+    else
+        infer(diff_cu_qp_delta_depth, 0);
+
+    se(pps_cb_qp_offset, -12, +12);
+    se(pps_cr_qp_offset, -12, +12);
+    flag(pps_slice_chroma_qp_offsets_present_flag);
+
+    flag(weighted_pred_flag);
+    flag(weighted_bipred_flag);
+
+    flag(transquant_bypass_enabled_flag);
+    flag(tiles_enabled_flag);
+    flag(entropy_coding_sync_enabled_flag);
+
+    if (current->tiles_enabled_flag) {
+        ue(num_tile_columns_minus1, 0, HEVC_MAX_TILE_COLUMNS);
+        ue(num_tile_rows_minus1,    0, HEVC_MAX_TILE_ROWS);
+        flag(uniform_spacing_flag);
+        if (!current->uniform_spacing_flag) {
+            for (i = 0; i < current->num_tile_columns_minus1; i++)
+                ue(column_width_minus1[i], 0, sps->pic_width_in_luma_samples);
+            for (i = 0; i < current->num_tile_rows_minus1; i++)
+                ue(row_height_minus1[i],   0, sps->pic_height_in_luma_samples);
+        }
+        flag(loop_filter_across_tiles_enabled_flag);
+    } else {
+        infer(num_tile_columns_minus1, 0);
+        infer(num_tile_rows_minus1,    0);
+    }
+
+    flag(pps_loop_filter_across_slices_enabled_flag);
+    flag(deblocking_filter_control_present_flag);
+    if (current->deblocking_filter_control_present_flag) {
+        flag(deblocking_filter_override_enabled_flag);
+        flag(pps_deblocking_filter_disabled_flag);
+        if (!current->pps_deblocking_filter_disabled_flag) {
+            se(pps_beta_offset_div2, -6, +6);
+            se(pps_tc_offset_div2,   -6, +6);
+        } else {
+            infer(pps_beta_offset_div2, 0);
+            infer(pps_tc_offset_div2,   0);
+        }
+    } else {
+        infer(deblocking_filter_override_enabled_flag, 0);
+        infer(pps_deblocking_filter_disabled_flag,     0);
+        infer(pps_beta_offset_div2, 0);
+        infer(pps_tc_offset_div2,   0);
+    }
+
+    flag(pps_scaling_list_data_present_flag);
+    if (current->pps_scaling_list_data_present_flag)
+        CHECK(FUNC(scaling_list_data)(ctx, rw, &current->scaling_list));
+
+    flag(lists_modification_present_flag);
+
+    ue(log2_parallel_merge_level_minus2,
+       0, (sps->log2_min_luma_coding_block_size_minus3 + 3 +
+           sps->log2_diff_max_min_luma_coding_block_size - 2));
+
+    flag(slice_segment_header_extension_present_flag);
+
+    flag(pps_extension_present_flag);
+    if (current->pps_extension_present_flag) {
+        flag(pps_range_extension_flag);
+        flag(pps_multilayer_extension_flag);
+        flag(pps_3d_extension_flag);
+        flag(pps_scc_extension_flag);
+        u(4, pps_extension_4bits, 0, (1 << 4) - 1);
+    }
+    if (current->pps_range_extension_flag)
+        CHECK(FUNC(pps_range_extension)(ctx, rw, current));
+    if (current->pps_multilayer_extension_flag)
+        return AVERROR_PATCHWELCOME;
+    if (current->pps_3d_extension_flag)
+        return AVERROR_PATCHWELCOME;
+    if (current->pps_scc_extension_flag)
+        CHECK(FUNC(pps_scc_extension)(ctx, rw, current));
+    if (current->pps_extension_4bits)
+        CHECK(FUNC(extension_data)(ctx, rw, &current->extension_data));
+
+    CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
+
+    return 0;
+}
+
+static int FUNC(aud)(CodedBitstreamContext *ctx, RWContext *rw,
+                     H265RawAUD *current)
+{
+    int err;
+
+    HEADER("Access Unit Delimiter");
+
+    CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header, HEVC_NAL_AUD));
+
+    u(3, pic_type, 0, 2);
+
+    CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
+
+    return 0;
+}
+
+static int FUNC(ref_pic_lists_modification)(CodedBitstreamContext *ctx, RWContext *rw,
+                                            H265RawSliceHeader *current,
+                                            unsigned int num_pic_total_curr)
+{
+    unsigned int entry_size;
+    int err, i;
+
+    entry_size = av_log2(num_pic_total_curr - 1) + 1;
+
+    flag(ref_pic_list_modification_flag_l0);
+    if (current->ref_pic_list_modification_flag_l0) {
+        for (i = 0; i <= current->num_ref_idx_l0_active_minus1; i++)
+            u(entry_size, list_entry_l0[i], 0, num_pic_total_curr - 1);
+    }
+
+    if (current->slice_type == HEVC_SLICE_B) {
+        flag(ref_pic_list_modification_flag_l1);
+        if (current->ref_pic_list_modification_flag_l1) {
+            for (i = 0; i <= current->num_ref_idx_l1_active_minus1; i++)
+                u(entry_size, list_entry_l1[i], 0, num_pic_total_curr - 1);
+        }
+    }
+
+    return 0;
+}
+
+static int FUNC(pred_weight_table)(CodedBitstreamContext *ctx, RWContext *rw,
+                                   H265RawSliceHeader *current)
+{
+    CodedBitstreamH265Context *h265 = ctx->priv_data;
+    const H265RawSPS *sps = h265->active_sps;
+    int err, i, j;
+    int chroma = !sps->separate_colour_plane_flag &&
+                  sps->chroma_format_idc != 0;
+
+    ue(luma_log2_weight_denom, 0, 7);
+    if (chroma)
+        se(delta_chroma_log2_weight_denom, -7, 7);
+    else
+        infer(delta_chroma_log2_weight_denom, 0);
+
+    for (i = 0; i <= current->num_ref_idx_l0_active_minus1; i++) {
+        if (1 /* is not same POC and same layer_id */)
+            flag(luma_weight_l0_flag[i]);
+        else
+            infer(luma_weight_l0_flag[i], 0);
+    }
+    if (chroma) {
+        for (i = 0; i <= current->num_ref_idx_l0_active_minus1; i++) {
+            if (1 /* is not same POC and same layer_id */)
+                flag(chroma_weight_l0_flag[i]);
+            else
+                infer(chroma_weight_l0_flag[i], 0);
+        }
+    }
+
+    for (i = 0; i <= current->num_ref_idx_l0_active_minus1; i++) {
+        if (current->luma_weight_l0_flag[i]) {
+            se(delta_luma_weight_l0[i], -128, +127);
+            se(luma_offset_l0[i],
+               -(1 << (sps->bit_depth_luma_minus8 + 8 - 1)),
+               ((1 << (sps->bit_depth_luma_minus8 + 8 - 1)) - 1));
+        } else {
+            infer(delta_luma_weight_l0[i], 0);
+            infer(luma_offset_l0[i],       0);
+        }
+        if (current->chroma_weight_l0_flag[i]) {
+            for (j = 0; j < 2; j++) {
+                se(delta_chroma_weight_l0[i][j], -128, +127);
+                se(chroma_offset_l0[i][j],
+                   -(4 << (sps->bit_depth_chroma_minus8 + 8 - 1)),
+                   ((4 << (sps->bit_depth_chroma_minus8 + 8 - 1)) - 1));
+            }
+        } else {
+            for (j = 0; j < 2; j++) {
+                infer(delta_chroma_weight_l0[i][j], 0);
+                infer(chroma_offset_l0[i][j],       0);
+            }
+        }
+    }
+
+    if (current->slice_type == HEVC_SLICE_B) {
+        for (i = 0; i <= current->num_ref_idx_l1_active_minus1; i++) {
+            if (1 /* RefPicList1[i] is not CurrPic, nor is it in a different layer */)
+                flag(luma_weight_l1_flag[i]);
+            else
+                infer(luma_weight_l1_flag[i], 0);
+        }
+        if (chroma) {
+            for (i = 0; i <= current->num_ref_idx_l1_active_minus1; i++) {
+                if (1 /* RefPicList1[i] is not CurrPic, nor is it in a different layer */)
+                    flag(chroma_weight_l1_flag[i]);
+                else
+                    infer(chroma_weight_l1_flag[i], 0);
+            }
+        }
+
+        for (i = 0; i <= current->num_ref_idx_l1_active_minus1; i++) {
+            if (current->luma_weight_l1_flag[i]) {
+                se(delta_luma_weight_l1[i], -128, +127);
+                se(luma_offset_l1[i],
+                   -(1 << (sps->bit_depth_luma_minus8 + 8 - 1)),
+                   ((1 << (sps->bit_depth_luma_minus8 + 8 - 1)) - 1));
+            } else {
+                infer(delta_luma_weight_l1[i], 0);
+                infer(luma_offset_l1[i],       0);
+            }
+            if (current->chroma_weight_l1_flag[i]) {
+                for (j = 0; j < 2; j++) {
+                    se(delta_chroma_weight_l1[i][j], -128, +127);
+                    se(chroma_offset_l1[i][j],
+                       -(4 << (sps->bit_depth_chroma_minus8 + 8 - 1)),
+                       ((4 << (sps->bit_depth_chroma_minus8 + 8 - 1)) - 1));
+                }
+            } else {
+                for (j = 0; j < 2; j++) {
+                    infer(delta_chroma_weight_l1[i][j], 0);
+                    infer(chroma_offset_l1[i][j],       0);
+                }
+            }
+        }
+    }
+
+    return 0;
+}
+
+static int FUNC(slice_segment_header)(CodedBitstreamContext *ctx, RWContext *rw,
+                                      H265RawSliceHeader *current)
+{
+    CodedBitstreamH265Context *h265 = ctx->priv_data;
+    const H265RawSPS *sps;
+    const H265RawPPS *pps;
+    unsigned int min_cb_log2_size_y, ctb_log2_size_y, ctb_size_y;
+    unsigned int pic_width_in_ctbs_y, pic_height_in_ctbs_y, pic_size_in_ctbs_y;
+    unsigned int num_pic_total_curr = 0;
+    int err, i;
+
+    HEADER("Slice Segment Header");
+
+    CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header, -1));
+
+    flag(first_slice_segment_in_pic_flag);
+
+    if (current->nal_unit_header.nal_unit_type >= HEVC_NAL_BLA_W_LP &&
+        current->nal_unit_header.nal_unit_type <= HEVC_NAL_IRAP_VCL23)
+        flag(no_output_of_prior_pics_flag);
+
+    ue(slice_pic_parameter_set_id, 0, 63);
+
+    pps = h265->pps[current->slice_pic_parameter_set_id];
+    if (!pps) {
+        av_log(ctx->log_ctx, AV_LOG_ERROR, "PPS id %d not available.\n",
+               current->slice_pic_parameter_set_id);
+        return AVERROR_INVALIDDATA;
+    }
+    h265->active_pps = pps;
+
+    sps = h265->sps[pps->pps_seq_parameter_set_id];
+    if (!sps) {
+        av_log(ctx->log_ctx, AV_LOG_ERROR, "SPS id %d not available.\n",
+               pps->pps_seq_parameter_set_id);
+        return AVERROR_INVALIDDATA;
+    }
+    h265->active_sps = sps;
+
+    min_cb_log2_size_y = sps->log2_min_luma_coding_block_size_minus3 + 3;
+    ctb_log2_size_y = min_cb_log2_size_y + sps->log2_diff_max_min_luma_coding_block_size;
+    ctb_size_y = 1 << ctb_log2_size_y;
+    pic_width_in_ctbs_y =
+        (sps->pic_width_in_luma_samples + ctb_size_y - 1) / ctb_size_y;
+    pic_height_in_ctbs_y =
+        (sps->pic_height_in_luma_samples + ctb_size_y - 1) / ctb_size_y;
+    pic_size_in_ctbs_y = pic_width_in_ctbs_y * pic_height_in_ctbs_y;
+
+    if (!current->first_slice_segment_in_pic_flag) {
+        unsigned int address_size = av_log2(pic_size_in_ctbs_y - 1) + 1;
+        if (pps->dependent_slice_segments_enabled_flag)
+            flag(dependent_slice_segment_flag);
+        else
+            infer(dependent_slice_segment_flag, 0);
+        u(address_size, slice_segment_address, 0, pic_size_in_ctbs_y - 1);
+    } else {
+        infer(dependent_slice_segment_flag, 0);
+    }
+
+    if (!current->dependent_slice_segment_flag) {
+        for (i = 0; i < pps->num_extra_slice_header_bits; i++)
+            flag(slice_reserved_flag[i]);
+
+        ue(slice_type, 0, 2);
+
+        if (pps->output_flag_present_flag)
+            flag(pic_output_flag);
+
+        if (sps->separate_colour_plane_flag)
+            u(2, colour_plane_id, 0, 2);
+
+        if (current->nal_unit_header.nal_unit_type != HEVC_NAL_IDR_W_RADL &&
+            current->nal_unit_header.nal_unit_type != HEVC_NAL_IDR_N_LP) {
+            const H265RawSTRefPicSet *rps;
+
+            u(sps->log2_max_pic_order_cnt_lsb_minus4 + 4, slice_pic_order_cnt_lsb,
+              0, (1 << (sps->log2_max_pic_order_cnt_lsb_minus4 + 4)) - 1);
+
+            flag(short_term_ref_pic_set_sps_flag);
+            if (!current->short_term_ref_pic_set_sps_flag) {
+                CHECK(FUNC(st_ref_pic_set)(ctx, rw, &current->short_term_ref_pic_set,
+                                           sps->num_short_term_ref_pic_sets, sps));
+                rps = &current->short_term_ref_pic_set;
+            } else if (sps->num_short_term_ref_pic_sets > 1) {
+                unsigned int idx_size = av_log2(sps->num_short_term_ref_pic_sets - 1) + 1;
+                u(idx_size, short_term_ref_pic_set_idx,
+                  0, sps->num_short_term_ref_pic_sets - 1);
+                rps = &sps->st_ref_pic_set[current->short_term_ref_pic_set_idx];
+            } else {
+                infer(short_term_ref_pic_set_idx, 0);
+                rps = &sps->st_ref_pic_set[0];
+            }
+
+            num_pic_total_curr = 0;
+            for (i = 0; i < rps->num_negative_pics; i++)
+                if (rps->used_by_curr_pic_s0_flag[i])
+                    ++num_pic_total_curr;
+            for (i = 0; i < rps->num_positive_pics; i++)
+                if (rps->used_by_curr_pic_s1_flag[i])
+                    ++num_pic_total_curr;
+
+            if (sps->long_term_ref_pics_present_flag) {
+                unsigned int idx_size;
+
+                if (sps->num_long_term_ref_pics_sps > 0) {
+                    ue(num_long_term_sps, 0, sps->num_long_term_ref_pics_sps);
+                    idx_size = av_log2(sps->num_long_term_ref_pics_sps - 1) + 1;
+                } else {
+                    infer(num_long_term_sps, 0);
+                    idx_size = 0;
+                }
+                ue(num_long_term_pics, 0, HEVC_MAX_LONG_TERM_REF_PICS);
+
+                for (i = 0; i < current->num_long_term_sps +
+                                current->num_long_term_pics; i++) {
+                    if (i < current->num_long_term_sps) {
+                        if (sps->num_long_term_ref_pics_sps > 1)
+                            u(idx_size, lt_idx_sps[i],
+                              0, sps->num_long_term_ref_pics_sps - 1);
+                        if (sps->used_by_curr_pic_lt_sps_flag[current->lt_idx_sps[i]])
+                            ++num_pic_total_curr;
+                    } else {
+                        u(sps->log2_max_pic_order_cnt_lsb_minus4 + 4, poc_lsb_lt[i],
+                          0, (1 << (sps->log2_max_pic_order_cnt_lsb_minus4 + 4)) - 1);
+                        flag(used_by_curr_pic_lt_flag[i]);
+                        if (current->used_by_curr_pic_lt_flag[i])
+                            ++num_pic_total_curr;
+                    }
+                    flag(delta_poc_msb_present_flag[i]);
+                    if (current->delta_poc_msb_present_flag[i])
+                        ue(delta_poc_msb_cycle_lt[i], 0, UINT32_MAX - 1);
+                    else
+                        infer(delta_poc_msb_cycle_lt[i], 0);
+                }
+            }
+
+            if (sps->sps_temporal_mvp_enabled_flag)
+                flag(slice_temporal_mvp_enabled_flag);
+            else
+                infer(slice_temporal_mvp_enabled_flag, 0);
+
+            if (pps->pps_curr_pic_ref_enabled_flag)
+                ++num_pic_total_curr;
+        }
+
+        if (sps->sample_adaptive_offset_enabled_flag) {
+            flag(slice_sao_luma_flag);
+            if (!sps->separate_colour_plane_flag && sps->chroma_format_idc != 0)
+                flag(slice_sao_chroma_flag);
+            else
+                infer(slice_sao_chroma_flag, 0);
+        } else {
+            infer(slice_sao_luma_flag,   0);
+            infer(slice_sao_chroma_flag, 0);
+        }
+
+        if (current->slice_type == HEVC_SLICE_P ||
+            current->slice_type == HEVC_SLICE_B) {
+            flag(num_ref_idx_active_override_flag);
+            if (current->num_ref_idx_active_override_flag) {
+                ue(num_ref_idx_l0_active_minus1, 0, 14);
+                if (current->slice_type == HEVC_SLICE_B)
+                    ue(num_ref_idx_l1_active_minus1, 0, 14);
+                else
+                    infer(num_ref_idx_l1_active_minus1, pps->num_ref_idx_l1_default_active_minus1);
+            } else {
+                infer(num_ref_idx_l0_active_minus1, pps->num_ref_idx_l0_default_active_minus1);
+                infer(num_ref_idx_l1_active_minus1, pps->num_ref_idx_l1_default_active_minus1);
+            }
+
+            if (pps->lists_modification_present_flag && num_pic_total_curr > 1)
+                CHECK(FUNC(ref_pic_lists_modification)(ctx, rw, current,
+                                                       num_pic_total_curr));
+
+            if (current->slice_type == HEVC_SLICE_B)
+                flag(mvd_l1_zero_flag);
+            if (pps->cabac_init_present_flag)
+                flag(cabac_init_flag);
+            else
+                infer(cabac_init_flag, 0);
+            if (current->slice_temporal_mvp_enabled_flag) {
+                if (current->slice_type == HEVC_SLICE_B)
+                    flag(collocated_from_l0_flag);
+                else
+                    infer(collocated_from_l0_flag, 1);
+                if (current->collocated_from_l0_flag) {
+                    if (current->num_ref_idx_l0_active_minus1 > 0)
+                        ue(collocated_ref_idx, 0, current->num_ref_idx_l0_active_minus1);
+                    else
+                        infer(collocated_ref_idx, 0);
+                } else {
+                    if (current->num_ref_idx_l1_active_minus1 > 0)
+                        ue(collocated_ref_idx, 0, current->num_ref_idx_l1_active_minus1);
+                    else
+                        infer(collocated_ref_idx, 0);
+                }
+            }
+
+            if ((pps->weighted_pred_flag   && current->slice_type == HEVC_SLICE_P) ||
+                (pps->weighted_bipred_flag && current->slice_type == HEVC_SLICE_B))
+                CHECK(FUNC(pred_weight_table)(ctx, rw, current));
+
+            ue(five_minus_max_num_merge_cand, 0, 4);
+            if (sps->motion_vector_resolution_control_idc == 2)
+                flag(use_integer_mv_flag);
+            else
+                infer(use_integer_mv_flag, sps->motion_vector_resolution_control_idc);
+        }
+
+        se(slice_qp_delta,
+           - 6 * sps->bit_depth_luma_minus8 - (pps->init_qp_minus26 + 26),
+           + 51 - (pps->init_qp_minus26 + 26));
+        if (pps->pps_slice_chroma_qp_offsets_present_flag) {
+            se(slice_cb_qp_offset, -12, +12);
+            se(slice_cr_qp_offset, -12, +12);
+        } else {
+            infer(slice_cb_qp_offset, 0);
+            infer(slice_cr_qp_offset, 0);
+        }
+        if (pps->pps_slice_act_qp_offsets_present_flag) {
+            se(slice_act_y_qp_offset,
+               -12 - (pps->pps_act_y_qp_offset_plus5 - 5),
+               +12 - (pps->pps_act_y_qp_offset_plus5 - 5));
+            se(slice_act_cb_qp_offset,
+               -12 - (pps->pps_act_cb_qp_offset_plus5 - 5),
+               +12 - (pps->pps_act_cb_qp_offset_plus5 - 5));
+            se(slice_act_cr_qp_offset,
+               -12 - (pps->pps_act_cr_qp_offset_plus3 - 3),
+               +12 - (pps->pps_act_cr_qp_offset_plus3 - 3));
+        } else {
+            infer(slice_act_y_qp_offset,  0);
+            infer(slice_act_cb_qp_offset, 0);
+            infer(slice_act_cr_qp_offset, 0);
+        }
+        if (pps->chroma_qp_offset_list_enabled_flag)
+            flag(cu_chroma_qp_offset_enabled_flag);
+        else
+            infer(cu_chroma_qp_offset_enabled_flag, 0);
+
+        if (pps->deblocking_filter_override_enabled_flag)
+            flag(deblocking_filter_override_flag);
+        else
+            infer(deblocking_filter_override_flag, 0);
+        if (current->deblocking_filter_override_flag) {
+            flag(slice_deblocking_filter_disabled_flag);
+            if (!current->slice_deblocking_filter_disabled_flag) {
+                se(slice_beta_offset_div2, -6, +6);
+                se(slice_tc_offset_div2,   -6, +6);
+            } else {
+                infer(slice_beta_offset_div2, pps->pps_beta_offset_div2);
+                infer(slice_tc_offset_div2,   pps->pps_tc_offset_div2);
+            }
+        } else {
+            infer(slice_deblocking_filter_disabled_flag,
+                  pps->pps_deblocking_filter_disabled_flag);
+            infer(slice_beta_offset_div2, pps->pps_beta_offset_div2);
+            infer(slice_tc_offset_div2,   pps->pps_tc_offset_div2);
+        }
+        if (pps->pps_loop_filter_across_slices_enabled_flag &&
+            (current->slice_sao_luma_flag || current->slice_sao_chroma_flag ||
+             !current->slice_deblocking_filter_disabled_flag))
+            flag(slice_loop_filter_across_slices_enabled_flag);
+        else
+            infer(slice_loop_filter_across_slices_enabled_flag,
+                  pps->pps_loop_filter_across_slices_enabled_flag);
+    }
+
+    if (pps->tiles_enabled_flag || pps->entropy_coding_sync_enabled_flag) {
+        unsigned int num_entry_point_offsets_limit;
+        if (!pps->tiles_enabled_flag && pps->entropy_coding_sync_enabled_flag)
+            num_entry_point_offsets_limit = pic_height_in_ctbs_y - 1;
+        else if (pps->tiles_enabled_flag && !pps->entropy_coding_sync_enabled_flag)
+            num_entry_point_offsets_limit =
+                (pps->num_tile_columns_minus1 + 1) * (pps->num_tile_rows_minus1 + 1);
+        else
+            num_entry_point_offsets_limit =
+                (pps->num_tile_columns_minus1 + 1) * pic_height_in_ctbs_y - 1;
+        ue(num_entry_point_offsets, 0, num_entry_point_offsets_limit);
+
+        if (current->num_entry_point_offsets > HEVC_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 (current->num_entry_point_offsets > 0) {
+            ue(offset_len_minus1, 0, 31);
+            for (i = 0; i < current->num_entry_point_offsets; i++)
+                u(current->offset_len_minus1 + 1, entry_point_offset_minus1[i],
+                  0, (1 << (current->offset_len_minus1 + 1)) - 1);
+        }
+    }
+
+    if (pps->slice_segment_header_extension_present_flag) {
+        ue(slice_segment_header_extension_length, 0, 256);
+        for (i = 0; i < current->slice_segment_header_extension_length; i++)
+            u(8, slice_segment_header_extension_data_byte[i], 0x00, 0xff);
+    }
+
+    CHECK(FUNC(byte_alignment)(ctx, rw));
+
+    return 0;
+}
diff --git a/libavcodec/cbs_internal.h b/libavcodec/cbs_internal.h
index 2d417d4a40..f8263bef0a 100644
--- a/libavcodec/cbs_internal.h
+++ b/libavcodec/cbs_internal.h
@@ -84,6 +84,7 @@ int ff_cbs_write_unsigned(CodedBitstreamContext *ctx, PutBitContext *pbc,
 
 
 extern const CodedBitstreamType ff_cbs_type_h264;
+extern const CodedBitstreamType ff_cbs_type_h265;
 
 
 #endif /* AVCODEC_CBS_INTERNAL_H */