diff mbox series

[FFmpeg-devel,v4,03/10] avcodec: add bitstream parser for H266/VVC

Message ID 20221115103624.48778-4-thomas.ff@spin-digital.com
State New
Headers show
Series Add support for H266/VVC | expand

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andriy/make_x86 success Make finished
andriy/make_fate_x86 success Make fate finished

Commit Message

Thomas Siedel Nov. 15, 2022, 10:36 a.m. UTC
Add nal parser ff_vvc_parser to parse vvc elementary bitstreams.

Signed-off-by: Thomas Siedel <thomas.ff@spin-digital.com>
---
 configure                |   3 +
 libavcodec/Makefile      |   2 +
 libavcodec/h2645_parse.c |  71 ++++-
 libavcodec/parsers.c     |   1 +
 libavcodec/vvc_parser.c  | 601 +++++++++++++++++++++++++++++++++++++++
 5 files changed, 677 insertions(+), 1 deletion(-)
 create mode 100644 libavcodec/vvc_parser.c
diff mbox series

Patch

diff --git a/configure b/configure
index e6470dc03b..bd11b67949 100755
--- a/configure
+++ b/configure
@@ -2447,6 +2447,7 @@  CONFIG_EXTRA="
     cbs_av1
     cbs_h264
     cbs_h265
+    cbs_h266
     cbs_jpeg
     cbs_mpeg2
     cbs_vp9
@@ -2727,6 +2728,7 @@  threads_if_any="$THREADS_LIST"
 cbs_av1_select="cbs"
 cbs_h264_select="cbs"
 cbs_h265_select="cbs"
+cbs_h266_select="cbs"
 cbs_jpeg_select="cbs"
 cbs_mpeg2_select="cbs"
 cbs_vp9_select="cbs"
@@ -3272,6 +3274,7 @@  hevc_parser_select="hevcparse"
 mpegaudio_parser_select="mpegaudioheader"
 mpeg4video_parser_select="h263dsp mpegvideodec qpeldsp"
 vc1_parser_select="vc1dsp"
+vvc_parser_select="cbs_h266"
 
 # bitstream_filters
 aac_adtstoasc_bsf_select="adts_header mpeg4audio"
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 94dc75a1b2..8eea3bf243 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -76,6 +76,7 @@  OBJS-$(CONFIG_CBS)                     += cbs.o cbs_bsf.o
 OBJS-$(CONFIG_CBS_AV1)                 += cbs_av1.o
 OBJS-$(CONFIG_CBS_H264)                += cbs_h2645.o cbs_sei.o h2645_parse.o
 OBJS-$(CONFIG_CBS_H265)                += cbs_h2645.o cbs_sei.o h2645_parse.o
+OBJS-$(CONFIG_CBS_H266)                += cbs_h2645.o cbs_sei.o h2645_parse.o
 OBJS-$(CONFIG_CBS_JPEG)                += cbs_jpeg.o
 OBJS-$(CONFIG_CBS_MPEG2)               += cbs_mpeg2.o
 OBJS-$(CONFIG_CBS_VP9)                 += cbs_vp9.o
@@ -1175,6 +1176,7 @@  OBJS-$(CONFIG_VC1_PARSER)              += vc1_parser.o vc1.o vc1data.o  \
 OBJS-$(CONFIG_VP3_PARSER)              += vp3_parser.o
 OBJS-$(CONFIG_VP8_PARSER)              += vp8_parser.o
 OBJS-$(CONFIG_VP9_PARSER)              += vp9_parser.o
+OBJS-$(CONFIG_VVC_PARSER)              += vvc_parser.o
 OBJS-$(CONFIG_WEBP_PARSER)             += webp_parser.o
 OBJS-$(CONFIG_XBM_PARSER)              += xbm_parser.o
 OBJS-$(CONFIG_XMA_PARSER)              += xma_parser.o
diff --git a/libavcodec/h2645_parse.c b/libavcodec/h2645_parse.c
index 90944177c7..9fbeee3edd 100644
--- a/libavcodec/h2645_parse.c
+++ b/libavcodec/h2645_parse.c
@@ -27,6 +27,7 @@ 
 #include "libavutil/mem.h"
 
 #include "bytestream.h"
+#include "vvc.h"
 #include "hevc.h"
 #include "h264.h"
 #include "h2645_parse.h"
@@ -145,6 +146,47 @@  nsc:
     return si;
 }
 
+static const char *const vvc_nal_type_name[32] = {
+    "TRAIL_NUT", // VVC_TRAIL_NUT
+    "STSA_NUT", // VVC_STSA_NUT
+    "RADL_NUT", // VVC_RADL_NUT
+    "RASL_NUT", // VVC_RASL_NUT
+    "RSV_VCL_4", // VVC_RSV_VCL_4
+    "RSV_VCL_5", // VVC_RSV_VCL_5
+    "RSV_VCL_6", // VVC_RSV_VCL_6
+    "IDR_W_RADL", // VVC_IDR_W_RADL
+    "IDR_N_LP", // VVC_IDR_N_LP
+    "CRA_NUT", // VVC_CRA_NUT
+    "GDR_NUT", // VVC_GDR_NUT
+    "RSV_IRAP_11", // VVC_RSV_IRAP_11
+    "OPI_NUT", // VVC_OPI_NUT
+    "DCI_NUT", // VVC_DCI_NUT
+    "VPS_NUT", // VVC_VPS_NUT
+    "SPS_NUT", // VVC_SPS_NUT
+    "PPS_NUT", // VVC_PPS_NUT
+    "PREFIX_APS_NUT",// VVC_PREFIX_APS_NUT
+    "SUFFIX_APS_NUT",// VVC_SUFFIX_APS_NUT
+    "PH_NUT", // VVC_PH_NUT
+    "AUD_NUT", // VVC_AUD_NUT
+    "EOS_NUT", // VVC_EOS_NUT
+    "EOB_NUT", // VVC_EOB_NUT
+    "PREFIX_SEI_NUT",// VVC_PREFIX_SEI_NUT
+    "SUFFIX_SEI_NUT",// VVC_SUFFIX_SEI_NUT
+    "FD_NUT", // VVC_FD_NUT
+    "RSV_NVCL_26", // VVC_RSV_NVCL_26
+    "RSV_NVCL_27", // VVC_RSV_NVCL_27
+    "UNSPEC_28", // VVC_UNSPEC_28
+    "UNSPEC_29", // VVC_UNSPEC_29
+    "UNSPEC_30", // VVC_UNSPEC_30
+    "UNSPEC_31", // VVC_UNSPEC_31
+};
+
+static const char *vvc_nal_unit_name(int nal_type)
+{
+    av_assert0(nal_type >= 0 && nal_type < 32);
+    return vvc_nal_type_name[nal_type];
+}
+
 static const char *const hevc_nal_type_name[64] = {
     "TRAIL_N", // HEVC_NAL_TRAIL_N
     "TRAIL_R", // HEVC_NAL_TRAIL_R
@@ -293,6 +335,31 @@  static int get_bit_length(H2645NAL *nal, int min_size, int skip_trailing_zeros)
  * @return AVERROR_INVALIDDATA if the packet is not a valid NAL unit,
  * 0 otherwise
  */
+static int vvc_parse_nal_header(H2645NAL *nal, void *logctx)
+{
+    GetBitContext *gb = &nal->gb;
+
+    if (get_bits1(gb) != 0)     //forbidden_zero_bit
+        return AVERROR_INVALIDDATA;
+
+    skip_bits1(gb);             //nuh_reserved_zero_bit
+
+    nal->nuh_layer_id = get_bits(gb, 6);
+    nal->type = get_bits(gb, 5);
+    nal->temporal_id = get_bits(gb, 3) - 1;
+    if (nal->temporal_id < 0)
+        return AVERROR_INVALIDDATA;
+
+    if ((nal->type >= VVC_IDR_W_RADL && nal->type <= VVC_RSV_IRAP_11) && nal->temporal_id)
+        return AVERROR_INVALIDDATA;
+
+    av_log(logctx, AV_LOG_DEBUG,
+      "nal_unit_type: %d(%s), nuh_layer_id: %d, temporal_id: %d\n",
+           nal->type, vvc_nal_unit_name(nal->type), nal->nuh_layer_id, nal->temporal_id);
+
+    return 0;
+}
+
 static int hevc_parse_nal_header(H2645NAL *nal, void *logctx)
 {
     GetBitContext *gb = &nal->gb;
@@ -509,7 +576,9 @@  int ff_h2645_packet_split(H2645Packet *pkt, const uint8_t *buf, int length,
         /* Reset type in case it contains a stale value from a previously parsed NAL */
         nal->type = 0;
 
-        if (codec_id == AV_CODEC_ID_HEVC)
+        if (codec_id == AV_CODEC_ID_VVC)
+            ret = vvc_parse_nal_header(nal, logctx);
+        else if (codec_id == AV_CODEC_ID_HEVC)
             ret = hevc_parse_nal_header(nal, logctx);
         else
             ret = h264_parse_nal_header(nal, logctx);
diff --git a/libavcodec/parsers.c b/libavcodec/parsers.c
index d355808018..e5b01b7a59 100644
--- a/libavcodec/parsers.c
+++ b/libavcodec/parsers.c
@@ -74,6 +74,7 @@  extern const AVCodecParser ff_vorbis_parser;
 extern const AVCodecParser ff_vp3_parser;
 extern const AVCodecParser ff_vp8_parser;
 extern const AVCodecParser ff_vp9_parser;
+extern const AVCodecParser ff_vvc_parser;
 extern const AVCodecParser ff_webp_parser;
 extern const AVCodecParser ff_xbm_parser;
 extern const AVCodecParser ff_xma_parser;
diff --git a/libavcodec/vvc_parser.c b/libavcodec/vvc_parser.c
new file mode 100644
index 0000000000..81f27a23aa
--- /dev/null
+++ b/libavcodec/vvc_parser.c
@@ -0,0 +1,601 @@ 
+/*
+ * VVC parser
+ *
+ * Copyright (C) 2021 Nuo Mi <nuomi2021@gmail.com>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "cbs.h"
+#include "cbs_h266.h"
+#include "internal.h"
+#include "parser.h"
+#include "decode.h"
+
+#define START_CODE 0x000001 ///< start_code_prefix_one_3bytes
+
+#define IS_SLICE(nut) (nut <= VVC_RASL_NUT || (nut >= VVC_IDR_W_RADL && nut <= VVC_GDR_NUT))
+#define IS_PH(nut)    (nut == VVC_PH_NUT)
+#define IS_IDR(nut)   (nut == VVC_IDR_W_RADL || nut == VVC_IDR_N_LP)
+
+
+typedef struct PuInfo {
+    AVBufferRef *sps_ref;
+    AVBufferRef *pps_ref;
+    AVBufferRef *slice_ref;
+    AVBufferRef *ph_ref;
+
+    const H266RawPPS *pps;
+    const H266RawSPS *sps;
+    const H266RawPH *ph;
+    const H266RawSlice *slice;
+    int pic_type;
+} PuInfo;
+
+typedef struct AuDetector {
+    uint8_t prev_layer_id;
+    int prev_tid0_poc;
+    int prev_poc;
+} AuDetector;
+
+typedef struct VVCParserContext {
+    ParseContext pc;
+    CodedBitstreamContext *cbc;
+
+    CodedBitstreamFragment picture_unit;
+
+    PuInfo   au_info;
+    AVPacket au;
+    AVPacket last_au;
+
+    AuDetector au_detector;
+
+    int parsed_extradata;
+} VVCParserContext;
+
+static const enum AVPixelFormat pix_fmts_8bit[] = {
+    AV_PIX_FMT_GRAY8, AV_PIX_FMT_YUV420P,
+    AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P
+};
+
+static const enum AVPixelFormat pix_fmts_10bit[] = {
+    AV_PIX_FMT_GRAY10, AV_PIX_FMT_YUV420P10,
+    AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10
+};
+
+static int get_format(const H266RawSPS *sps)
+{
+    switch (sps->sps_bitdepth_minus8) {
+    case 0:
+        return pix_fmts_8bit[sps->sps_chroma_format_idc];
+    case 2:
+        return pix_fmts_10bit[sps->sps_chroma_format_idc];
+    }
+    return AV_PIX_FMT_NONE;
+}
+
+/**
+ * Find the end of the current frame in the bitstream.
+ * @return the position of the first byte of the next frame, or END_NOT_FOUND
+ */
+static int find_frame_end(AVCodecParserContext *s, const uint8_t *buf,
+                          int buf_size)
+{
+    VVCParserContext *ctx = s->priv_data;
+    ParseContext *pc = &ctx->pc;
+    int i;
+
+    for (i = 0; i < buf_size; i++) {
+        int nut;
+
+        pc->state64 = (pc->state64 << 8) | buf[i];
+
+        if (((pc->state64 >> 3 * 8) & 0xFFFFFF) != START_CODE)
+            continue;
+
+        nut = (pc->state64 >> (8 + 3)) & 0x1F;
+        // 7.4.2.4.3 and 7.4.2.4.4
+        if ((nut >= VVC_OPI_NUT && nut <= VVC_PREFIX_APS_NUT &&
+             nut != VVC_PH_NUT) || nut == VVC_AUD_NUT
+            || (nut == VVC_PREFIX_SEI_NUT && !pc->frame_start_found)
+            || nut == VVC_RSV_NVCL_26 || nut == VVC_UNSPEC_28
+            || nut == VVC_UNSPEC_29) {
+            if (pc->frame_start_found) {
+                pc->frame_start_found = 0;
+                return i - 5;
+            }
+        } else if (nut == VVC_PH_NUT || IS_SLICE(nut)) {
+            int sh_picture_header_in_slice_header_flag = buf[i] >> 7;
+
+            if (nut == VVC_PH_NUT || sh_picture_header_in_slice_header_flag) {
+                if (!pc->frame_start_found) {
+                    pc->frame_start_found = 1;
+                } else {        // First slice of next frame found
+                    pc->frame_start_found = 0;
+                    return i - 5;
+                }
+            }
+        }
+    }
+    return END_NOT_FOUND;
+}
+
+static int get_pict_type(const CodedBitstreamFragment *pu)
+{
+    int has_p = 0;
+    for (int i = 0; i < pu->nb_units; i++) {
+        CodedBitstreamUnit *unit = &pu->units[i];
+        if (IS_SLICE(unit->type)) {
+            const H266RawSlice *slice = unit->content;
+            uint8_t type = slice->header.sh_slice_type;
+            if (type == VVC_SLICE_TYPE_B) {
+                return AV_PICTURE_TYPE_B;
+            }
+            if (type == VVC_SLICE_TYPE_P) {
+                has_p = 1;
+            }
+        }
+    }
+    return has_p ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I;
+}
+
+static void pu_info_unref(PuInfo *info)
+{
+    av_buffer_unref(&info->slice_ref);
+    av_buffer_unref(&info->ph_ref);
+    av_buffer_unref(&info->pps_ref);
+    av_buffer_unref(&info->sps_ref);
+    info->slice = NULL;
+    info->ph = NULL;
+    info->pps = NULL;
+    info->sps = NULL;
+    info->pic_type = AV_PICTURE_TYPE_NONE;
+}
+
+static int pu_info_ref(PuInfo *dest, const PuInfo *src)
+{
+    pu_info_unref(dest);
+    dest->sps_ref = av_buffer_ref(src->sps_ref);
+    dest->pps_ref = av_buffer_ref(src->pps_ref);
+    if (src->ph_ref)
+        dest->ph_ref = av_buffer_ref(src->ph_ref);
+    dest->slice_ref = av_buffer_ref(src->slice_ref);
+    if (!dest->sps_ref || !dest->pps_ref || (src->ph_ref && !dest->ph_ref)
+        || !dest->slice_ref) {
+        pu_info_unref(dest);
+        return AVERROR(ENOMEM);
+    }
+
+    dest->sps = src->sps;
+    dest->pps = src->pps;
+    dest->ph = src->ph;
+    dest->slice = src->slice;
+    dest->pic_type = src->pic_type;
+    return 0;
+}
+
+static int set_parser_ctx(AVCodecParserContext *s, AVCodecContext *avctx,
+                          const PuInfo *pu)
+{
+    int ret, num = 0, den = 0;
+    static const uint8_t h266_sub_width_c[] = {
+        1, 2, 2, 1
+    };
+    static const uint8_t h266_sub_height_c[] = {
+        1, 2, 1, 1
+    };
+    const H266RawSPS *sps = pu->sps;
+    const H266RawPPS *pps = pu->pps;
+    //const H266RawPH  *ph  = pu->ph;
+    const H266RawNALUnitHeader *nal = &pu->slice->header.nal_unit_header;
+
+    /* set some sane default values */
+    s->pict_type         = AV_PICTURE_TYPE_I;
+    s->key_frame         = 0;
+    s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
+
+    s->key_frame = nal->nal_unit_type == VVC_IDR_W_RADL ||
+                   nal->nal_unit_type == VVC_IDR_N_LP ||
+                   nal->nal_unit_type == VVC_CRA_NUT ||
+                   nal->nal_unit_type == VVC_GDR_NUT;
+
+    s->coded_width  = pps->pps_pic_width_in_luma_samples;
+    s->coded_height = pps->pps_pic_height_in_luma_samples;
+    s->width = pps->pps_pic_width_in_luma_samples -
+        (pps->pps_conf_win_left_offset + pps->pps_conf_win_right_offset) *
+        h266_sub_width_c[sps->sps_chroma_format_idc];
+    s->height = pps->pps_pic_height_in_luma_samples -
+        (pps->pps_conf_win_top_offset + pps->pps_conf_win_bottom_offset) *
+        h266_sub_height_c[sps->sps_chroma_format_idc];;
+    s->pict_type = pu->pic_type;
+    s->format = get_format(sps);
+
+    avctx->profile = sps->profile_tier_level.general_profile_idc;
+    avctx->level = sps->profile_tier_level.general_level_idc;
+
+    avctx->colorspace = (enum AVColorSpace) sps->vui.vui_matrix_coeffs;
+    avctx->color_primaries = (enum AVColorPrimaries) sps->vui.vui_colour_primaries;
+    avctx->color_trc = (enum AVColorTransferCharacteristic) sps->vui.vui_transfer_characteristics;
+    avctx->color_range =
+        sps->vui.vui_full_range_flag ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG;
+
+    if (s->width != avctx->width || s->height != avctx->height) {
+        ret = ff_set_dimensions(avctx, s->width, s->height);
+        if (ret < 0)
+            return ret;
+    }
+    avctx->pix_fmt = s->format;
+    avctx->has_b_frames = (sps->sps_max_sublayers_minus1 + 1) > 2 ? 2 :
+                           sps->sps_max_sublayers_minus1;
+    avctx->max_b_frames = sps->sps_max_sublayers_minus1;
+
+    if (sps->sps_ptl_dpb_hrd_params_present_flag &&
+        sps->sps_timing_hrd_params_present_flag) {
+        num = sps->sps_general_timing_hrd_parameters.num_units_in_tick;
+        den = sps->sps_general_timing_hrd_parameters.time_scale;
+    } else {
+        return 1;
+    }
+    if (num != 0 && den != 0)
+        av_reduce(&avctx->framerate.den, &avctx->framerate.num,
+                  num, den, 1 << 30);
+
+    if (avctx->framerate.num)
+        avctx->time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational) {
+                                             avctx->ticks_per_frame, 1} ));
+
+    return 1;
+}
+
+static int set_ctx(AVCodecParserContext *s, AVCodecContext *avctx,
+                   const PuInfo *next_pu)
+{
+    VVCParserContext *ctx = s->priv_data;
+    int ret;
+    if (ctx->au_info.slice) {
+        if ((ret = set_parser_ctx(s, avctx, &ctx->au_info)) < 0)
+            return ret;
+    }
+    ret = pu_info_ref(&ctx->au_info, next_pu);
+    return ret;
+}
+
+//8.3.1 Decoding process for picture order count.
+//VTM did not follow the spec, and it's much simpler than spec.
+//We follow the VTM.
+static void get_slice_poc(VVCParserContext *s, int *poc,
+                          const H266RawSPS *sps,
+                          const H266RawPH *ph,
+                          const H266RawSliceHeader *slice, void *log_ctx)
+{
+    int poc_msb, max_poc_lsb, poc_lsb;
+    AuDetector *d = &s->au_detector;
+    max_poc_lsb = 1 << (sps->sps_log2_max_pic_order_cnt_lsb_minus4 + 4);
+    poc_lsb = ph->ph_pic_order_cnt_lsb;
+    if (IS_IDR(slice->nal_unit_header.nal_unit_type)) {
+        if (ph->ph_poc_msb_cycle_present_flag)
+            poc_msb = ph->ph_poc_msb_cycle_val * max_poc_lsb;
+        else
+            poc_msb = 0;
+    } else {
+        int prev_poc = d->prev_tid0_poc;
+        int prev_poc_lsb = prev_poc & (max_poc_lsb - 1);
+        int prev_poc_msb = prev_poc - prev_poc_lsb;
+        if (ph->ph_poc_msb_cycle_present_flag) {
+            poc_msb = ph->ph_poc_msb_cycle_val * max_poc_lsb;
+        } else {
+            if ((poc_lsb < prev_poc_lsb) && ((prev_poc_lsb - poc_lsb) >=
+                (max_poc_lsb / 2)))
+                poc_msb = prev_poc_msb + max_poc_lsb;
+            else if ((poc_lsb > prev_poc_lsb) && ((poc_lsb - prev_poc_lsb) >
+                     (max_poc_lsb / 2)))
+                poc_msb = prev_poc_msb - max_poc_lsb;
+            else
+                poc_msb = prev_poc_msb;
+        }
+    }
+
+    *poc = poc_msb + poc_lsb;
+}
+
+static void au_detector_init(AuDetector *d)
+{
+    d->prev_layer_id = UINT8_MAX;
+    d->prev_poc = INT_MAX;
+    d->prev_tid0_poc = INT_MAX;
+}
+
+static int is_au_start(VVCParserContext *s, const PuInfo *pu, void *log_ctx)
+{
+    //7.4.2.4.3
+    AuDetector *d = &s->au_detector;
+    const H266RawSPS *sps = pu->sps;
+    const H266RawNALUnitHeader *nal = &pu->slice->header.nal_unit_header;
+    const H266RawPH *ph = pu->ph;
+    const H266RawSlice *slice = pu->slice;
+    int ret, poc, nut;
+
+    get_slice_poc(s, &poc, sps, ph, &slice->header, log_ctx);
+
+    ret = (nal->nuh_layer_id <= d->prev_layer_id) || (poc != d->prev_poc);
+
+    nut = nal->nal_unit_type;
+    d->prev_layer_id = nal->nuh_layer_id;
+    d->prev_poc = poc;
+    if (nal->nuh_temporal_id_plus1 == 1 &&
+        !ph->ph_non_ref_pic_flag && nut != VVC_RADL_NUT
+        && nut != VVC_RASL_NUT) {
+        d->prev_tid0_poc = poc;
+    }
+    return ret;
+}
+
+static int get_pu_info(PuInfo *info, const CodedBitstreamH266Context *h266,
+                       const CodedBitstreamFragment *pu, void *logctx)
+{
+    const H266RawNALUnitHeader *nal;
+    int ret;
+
+    memset(info, 0, sizeof(*info));
+    for (int i = 0; i < pu->nb_units; i++) {
+        nal = pu->units[i].content;
+        if (!nal)
+            continue;
+        if (IS_PH(nal->nal_unit_type)) {
+            info->ph = pu->units[i].content;
+            info->ph_ref = pu->units[i].content_ref;
+        } else if (IS_SLICE(nal->nal_unit_type)) {
+            info->slice = pu->units[i].content;
+            info->slice_ref = pu->units[i].content_ref;
+            if (info->slice->header.sh_picture_header_in_slice_header_flag)
+                info->ph = &info->slice->header.sh_picture_header;
+            if (!info->ph) {
+                av_log(logctx, AV_LOG_ERROR,
+                       "can't find picture header in picture unit.\n");
+                ret = AVERROR_INVALIDDATA;
+                goto error;
+            }
+            break;
+        }
+    }
+    if (!info->slice) {
+        av_log(logctx, AV_LOG_ERROR, "can't find slice in picture unit.\n");
+        ret = AVERROR_INVALIDDATA;
+        goto error;
+    }
+    info->pps = h266->pps[info->ph->ph_pic_parameter_set_id];
+    if (!info->pps) {
+        av_log(logctx, AV_LOG_ERROR, "PPS id %d is not avaliable.\n",
+               info->ph->ph_pic_parameter_set_id);
+        ret = AVERROR_INVALIDDATA;
+        goto error;
+    }
+    info->pps_ref = h266->pps_ref[info->ph->ph_pic_parameter_set_id];
+    info->sps = h266->sps[info->pps->pps_seq_parameter_set_id];
+    if (!info->sps) {
+        av_log(logctx, AV_LOG_ERROR, "SPS id %d is not avaliable.\n",
+               info->pps->pps_seq_parameter_set_id);
+        ret = AVERROR_INVALIDDATA;
+        goto error;
+    }
+    info->sps_ref = h266->sps_ref[info->pps->pps_seq_parameter_set_id];
+    info->pic_type = get_pict_type(pu);
+    return 0;
+  error:
+    memset(info, 0, sizeof(*info));
+    return ret;
+}
+
+static int append_au(AVPacket *pkt, const uint8_t *buf, int buf_size)
+{
+    int offset = pkt->size;
+    int ret;
+    if ((ret = av_grow_packet(pkt, buf_size)) < 0)
+        goto end;
+    memcpy(pkt->data + offset, buf, buf_size);
+  end:
+    return ret;
+}
+
+/**
+ * Parse NAL units of found picture and decode some basic information.
+ *
+ * @param s parser context.
+ * @param avctx codec context.
+ * @param buf buffer with field/frame data.
+ * @param buf_size size of the buffer.
+ * @return < 0 for error, == 0 for a complete au, > 0 is not a completed au.
+ */
+static int parse_nal_units(AVCodecParserContext *s, const uint8_t *buf,
+                           int buf_size, AVCodecContext *avctx)
+{
+    VVCParserContext *ctx = s->priv_data;
+    const CodedBitstreamH266Context *h266 = ctx->cbc->priv_data;
+
+    CodedBitstreamFragment *pu = &ctx->picture_unit;
+    int ret;
+    PuInfo info;
+
+    if (!buf_size) {
+        if (ctx->au.size) {
+            if ((ret = av_packet_ref(&ctx->last_au, &ctx->au)) < 0)
+                goto end;
+            av_packet_unref(&ctx->au);
+            return 0;
+        }
+        return 1;
+    }
+
+    if ((ret = ff_cbs_read(ctx->cbc, pu, buf, buf_size)) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "Failed to parse picture unit.\n");
+        goto end;
+    }
+    if ((ret = get_pu_info(&info, h266, pu, avctx)) < 0)
+        goto end;
+    if (is_au_start(ctx, &info, avctx)) {
+        if ((ret = set_ctx(s, avctx, &info)) < 0)
+            goto end;
+        if ((ret = av_packet_ref(&ctx->last_au, &ctx->au)) < 0)
+            goto end;
+        av_packet_unref(&ctx->au);
+    } else {
+        ret = 1; //not a completed au
+    }
+    if (append_au(&ctx->au, buf, buf_size) < 0)
+        ret = AVERROR(ENOMEM);
+  end:
+    ff_cbs_fragment_reset(pu);
+    return ret;
+}
+
+/**
+ * Combine PU to AU
+ *
+ * @param s parser context.
+ * @param avctx codec context.
+ * @param buf buffer to a PU.
+ * @param buf_size size of the buffer.
+ * @return < 0 for error, == 0 a complete au, > 0 not a completed au.
+ */
+static int combine_au(AVCodecParserContext *s, AVCodecContext *avctx,
+                      const uint8_t **buf, int *buf_size)
+{
+    VVCParserContext *ctx = s->priv_data;
+    int ret;
+
+    ctx->cbc->log_ctx = avctx;
+
+    av_packet_unref(&ctx->last_au);
+    ret = parse_nal_units(s, *buf, *buf_size, avctx);
+    if (ret == 0) {
+        if (ctx->last_au.size) {
+            *buf = ctx->last_au.data;
+            *buf_size = ctx->last_au.size;
+        } else {
+            ret = 1; //no output
+        }
+    }
+    ctx->cbc->log_ctx = NULL;
+    return ret;
+}
+
+static int vvc_parser_parse(AVCodecParserContext *s, AVCodecContext *avctx,
+                            const uint8_t **poutbuf, int *poutbuf_size,
+                            const uint8_t *buf, int buf_size)
+{
+    int next, ret;
+    VVCParserContext *ctx = s->priv_data;
+    ParseContext *pc = &ctx->pc;
+    CodedBitstreamFragment *pu = &ctx->picture_unit;
+
+    int is_dummy_buf = !buf_size;
+    int flush = !buf_size;
+    const uint8_t *dummy_buf = buf;
+
+    if (avctx->extradata_size && !ctx->parsed_extradata) {
+        ctx->parsed_extradata = 1;
+
+        ret = ff_cbs_read_extradata_from_codec(ctx->cbc, pu, avctx);
+        if (ret < 0)
+            av_log(avctx, AV_LOG_WARNING, "Failed to parse extradata.\n");
+
+        ff_cbs_fragment_reset(pu);
+    }
+
+    if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
+        next = buf_size;
+    } else {
+        next = find_frame_end(s, buf, buf_size);
+        if (ff_combine_frame(pc, next, &buf, &buf_size) < 0)
+            goto no_out;
+    }
+
+    is_dummy_buf &= (dummy_buf == buf);
+
+    if (!is_dummy_buf) {
+        ret = combine_au(s, avctx, &buf, &buf_size);
+        if (ret > 0 && flush) {
+            buf_size = 0;
+            ret = combine_au(s, avctx, &buf, &buf_size);
+        }
+        if (ret != 0) {
+            buf_size = next;
+            goto no_out;
+        }
+    }
+
+    *poutbuf = buf;
+    *poutbuf_size = buf_size;
+    return next;
+  no_out:
+    *poutbuf = NULL;
+    *poutbuf_size = 0;
+    return buf_size;
+}
+
+static const CodedBitstreamUnitType decompose_unit_types[] = {
+    VVC_TRAIL_NUT,
+    VVC_STSA_NUT,
+    VVC_RADL_NUT,
+    VVC_RASL_NUT,
+    VVC_IDR_W_RADL,
+    VVC_IDR_N_LP,
+    VVC_CRA_NUT,
+    VVC_GDR_NUT,
+    VVC_VPS_NUT,
+    VVC_SPS_NUT,
+    VVC_PPS_NUT,
+    VVC_PH_NUT,
+    VVC_AUD_NUT,
+};
+
+static av_cold int vvc_parser_init(AVCodecParserContext *s)
+{
+    VVCParserContext *ctx = s->priv_data;
+    int ret;
+
+    ret = ff_cbs_init(&ctx->cbc, AV_CODEC_ID_VVC, NULL);
+    if (ret < 0)
+        return ret;
+    au_detector_init(&ctx->au_detector);
+
+    ctx->cbc->decompose_unit_types    = decompose_unit_types;
+    ctx->cbc->nb_decompose_unit_types = FF_ARRAY_ELEMS(decompose_unit_types);
+
+    return ret;
+}
+
+static void vvc_parser_close(AVCodecParserContext *s)
+{
+    VVCParserContext *ctx = s->priv_data;
+
+    pu_info_unref(&ctx->au_info);
+    av_packet_unref(&ctx->au);
+    av_packet_unref(&ctx->last_au);
+    ff_cbs_fragment_free(&ctx->picture_unit);
+
+    ff_cbs_close(&ctx->cbc);
+    av_freep(&ctx->pc.buffer);
+}
+
+AVCodecParser ff_vvc_parser = {
+    .codec_ids      = { AV_CODEC_ID_VVC },
+    .priv_data_size = sizeof(VVCParserContext),
+    .parser_init    = vvc_parser_init,
+    .parser_close   = vvc_parser_close,
+    .parser_parse   = vvc_parser_parse,
+};