/* * 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 "libavutil/intmath.h" #include "libavutil/mem.h" #include "libavutil/refstruct.h" #include "bytestream.h" #include "cbs.h" #include "cbs_internal.h" #include "cbs_h2645.h" #include "cbs_h266.h" #include "cbs_sei.h" #include "get_bits.h" #define HEADER(name) do { \ ff_cbs_trace_header(ctx, name); \ } while (0) #define CHECK(call) do { \ err = (call); \ if (err < 0) \ return err; \ } while (0) #define FUNC_NAME2(rw, codec, name) cbs_ ## codec ## _ ## rw ## _ ## name #define FUNC_NAME1(rw, codec, name) FUNC_NAME2(rw, codec, name) #define FUNC_H266(name) FUNC_NAME1(READWRITE, h266, name) #define FUNC_NAME2_EXPORT(rw, codec, name) ff_cbs_ ## codec ## _ ## rw ## _ ## name #define FUNC_NAME1_EXPORT(rw, codec, name) FUNC_NAME2_EXPORT(rw, codec, name) #define FUNC_SEI(name) FUNC_NAME1_EXPORT(READWRITE, sei, name) #define SEI_FUNC(name, args) \ static int FUNC_H266(name) args; \ static int FUNC_H266(name ## _internal)(CodedBitstreamContext *ctx, \ RWContext *rw, void *cur, \ SEIMessageState *state) \ { \ return FUNC_H266(name)(ctx, rw, cur, state); \ } \ static int FUNC_H266(name) args #define SUBSCRIPTS(subs, ...) (subs > 0 ? ((int[subs + 1]){ subs, __VA_ARGS__ }) : NULL) #define u(width, name, range_min, range_max) \ xu(width, name, current->name, range_min, range_max, 0, ) #define flag(name) ub(1, name) #define ue(name, range_min, range_max) \ xue(name, current->name, range_min, range_max, 0, ) #define i(width, name, range_min, range_max) \ xi(width, name, current->name, range_min, range_max, 0, ) #define ib(width, name) \ xi(width, name, current->name, MIN_INT_BITS(width), MAX_INT_BITS(width), 0, ) #define se(name, range_min, range_max) \ xse(name, current->name, range_min, range_max, 0, ) #define us(width, name, range_min, range_max, subs, ...) \ xu(width, name, current->name, range_min, range_max, subs, __VA_ARGS__) #define ubs(width, name, subs, ...) \ xu(width, name, current->name, 0, MAX_UINT_BITS(width), subs, __VA_ARGS__) #define flags(name, subs, ...) \ xu(1, name, current->name, 0, 1, subs, __VA_ARGS__) #define ues(name, range_min, range_max, subs, ...) \ xue(name, current->name, range_min, range_max, subs, __VA_ARGS__) #define is(width, name, range_min, range_max, subs, ...) \ xi(width, name, current->name, range_min, range_max, subs, __VA_ARGS__) #define ibs(width, name, subs, ...) \ xi(width, name, current->name, MIN_INT_BITS(width), MAX_INT_BITS(width), subs, __VA_ARGS__) #define ses(name, range_min, range_max, subs, ...) \ xse(name, current->name, range_min, range_max, subs, __VA_ARGS__) #define fixed(width, name, value) do { \ av_unused uint32_t fixed_value = value; \ xu(width, name, fixed_value, value, value, 0, ); \ } while (0) #define READ #define READWRITE read #define RWContext GetBitContext #define ub(width, name) do { \ uint32_t value; \ CHECK(ff_cbs_read_simple_unsigned(ctx, rw, width, #name, \ &value)); \ current->name = value; \ } while (0) #define xu(width, name, var, range_min, range_max, subs, ...) do { \ uint32_t value; \ CHECK(ff_cbs_read_unsigned(ctx, rw, width, #name, \ SUBSCRIPTS(subs, __VA_ARGS__), \ &value, range_min, range_max)); \ var = value; \ } while (0) #define xue(name, var, range_min, range_max, subs, ...) do { \ uint32_t value; \ CHECK(ff_cbs_read_ue_golomb(ctx, rw, #name, \ SUBSCRIPTS(subs, __VA_ARGS__), \ &value, range_min, range_max)); \ var = value; \ } while (0) #define xi(width, name, var, range_min, range_max, subs, ...) do { \ int32_t value; \ CHECK(ff_cbs_read_signed(ctx, rw, width, #name, \ SUBSCRIPTS(subs, __VA_ARGS__), \ &value, range_min, range_max)); \ var = value; \ } while (0) #define xse(name, var, range_min, range_max, subs, ...) do { \ int32_t value; \ CHECK(ff_cbs_read_se_golomb(ctx, rw, #name, \ SUBSCRIPTS(subs, __VA_ARGS__), \ &value, range_min, range_max)); \ var = value; \ } while (0) #define infer(name, value) do { \ current->name = value; \ } while (0) #define more_rbsp_data(var) ((var) = ff_cbs_h2645_read_more_rbsp_data(rw)) #define bit_position(rw) (get_bits_count(rw)) #define byte_alignment(rw) (get_bits_count(rw) % 8) #define allocate(name, size) do { \ name ## _ref = av_buffer_allocz(size + \ AV_INPUT_BUFFER_PADDING_SIZE); \ if (!name ## _ref) \ return AVERROR(ENOMEM); \ name = name ## _ref->data; \ } while (0) #define FUNC(name) FUNC_H266(name) #include "cbs_h266_syntax_template.c" #undef FUNC #undef READ #undef READWRITE #undef RWContext #undef ub #undef xu #undef xi #undef xue #undef xse #undef infer #undef more_rbsp_data #undef bit_position #undef byte_alignment #undef allocate #undef allocate_struct #define WRITE #define READWRITE write #define RWContext PutBitContext #define ub(width, name) do { \ uint32_t value = current->name; \ CHECK(ff_cbs_write_simple_unsigned(ctx, rw, width, #name, \ value)); \ } while (0) #define xu(width, name, var, range_min, range_max, subs, ...) do { \ uint32_t value = var; \ CHECK(ff_cbs_write_unsigned(ctx, rw, width, #name, \ SUBSCRIPTS(subs, __VA_ARGS__), \ value, range_min, range_max)); \ } while (0) #define xue(name, var, range_min, range_max, subs, ...) do { \ uint32_t value = var; \ CHECK(ff_cbs_write_ue_golomb(ctx, rw, #name, \ SUBSCRIPTS(subs, __VA_ARGS__), \ value, range_min, range_max)); \ } while (0) #define xi(width, name, var, range_min, range_max, subs, ...) do { \ int32_t value = var; \ CHECK(ff_cbs_write_signed(ctx, rw, width, #name, \ SUBSCRIPTS(subs, __VA_ARGS__), \ value, range_min, range_max)); \ } while (0) #define xse(name, var, range_min, range_max, subs, ...) do { \ int32_t value = var; \ CHECK(ff_cbs_write_se_golomb(ctx, rw, #name, \ SUBSCRIPTS(subs, __VA_ARGS__), \ value, range_min, range_max)); \ } while (0) #define infer(name, value) do { \ if (current->name != (value)) { \ av_log(ctx->log_ctx, AV_LOG_ERROR, \ "%s does not match inferred value: " \ "%"PRId64", but should be %"PRId64".\n", \ #name, (int64_t)current->name, (int64_t)(value)); \ return AVERROR_INVALIDDATA; \ } \ } while (0) #define more_rbsp_data(var) (var) #define bit_position(rw) (put_bits_count(rw)) #define byte_alignment(rw) (put_bits_count(rw) % 8) #define allocate(name, size) do { \ if (!name) { \ av_log(ctx->log_ctx, AV_LOG_ERROR, "%s must be set " \ "for writing.\n", #name); \ return AVERROR_INVALIDDATA; \ } \ } while (0) #define FUNC(name) FUNC_H266(name) #include "cbs_h266_syntax_template.c" #undef FUNC #undef WRITE #undef READWRITE #undef RWContext #undef ub #undef xu #undef xi #undef xue #undef xse #undef u #undef i #undef flag #undef ue #undef se #undef infer #undef more_rbsp_data #undef bit_position #undef byte_alignment #undef allocate static int cbs_h266_split_fragment(CodedBitstreamContext *ctx, CodedBitstreamFragment *frag, int header) { enum AVCodecID codec_id = ctx->codec->codec_id; CodedBitstreamH266Context *priv = ctx->priv_data; CodedBitstreamH2645Context *h2645 = &priv->common; GetByteContext gbc; int err; av_assert0(frag->data && frag->nb_units == 0); if (frag->data_size == 0) return 0; if(header && frag->data[0]) { // VVCC header. int ptl_present_flag, num_arrays; int b, i, j; h2645->mp4 = 1; bytestream2_init(&gbc, frag->data, frag->data_size); b = bytestream2_get_byte(&gbc); h2645->nal_length_size = ((b >> 1) & 3) + 1; ptl_present_flag = b & 1; if(ptl_present_flag) { int num_sublayers, num_bytes_constraint_info, num_sub_profiles; num_sublayers = (bytestream2_get_be16u(&gbc) >> 4) & 7; bytestream2_skip(&gbc, 1); // begin VvcPTLRecord(num_sublayers); num_bytes_constraint_info = bytestream2_get_byte(&gbc) & 0x3f; bytestream2_skip(&gbc, 2 + num_bytes_constraint_info); if(num_sublayers > 1) { int count_present_flags = 0; b = bytestream2_get_byte(&gbc); for(i = num_sublayers - 2; i >= 0; i--) { if((b >> (7 - (num_sublayers - 2 - i))) & 0x01) count_present_flags++; } bytestream2_skip(&gbc, count_present_flags); } num_sub_profiles = bytestream2_get_byte(&gbc); bytestream2_skip(&gbc, num_sub_profiles * 4); // end VvcPTLRecord(num_sublayers); bytestream2_skip(&gbc, 3 * 2); } num_arrays = bytestream2_get_byte(&gbc); for(j = 0; j < num_arrays; j++) { size_t start, end, size; int nal_unit_type = bytestream2_get_byte(&gbc) & 0x1f; unsigned int num_nalus = 1; if(nal_unit_type != VVC_DCI_NUT && nal_unit_type != VVC_OPI_NUT) num_nalus = bytestream2_get_be16(&gbc); start = bytestream2_tell(&gbc); for(i = 0; i < num_nalus; i++) { 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(&h2645->read_packet, frag->data + start, end - start, ctx->log_ctx, 2, AV_CODEC_ID_VVC, H2645_FLAG_IS_NALFF | H2645_FLAG_SMALL_PADDING | H2645_FLAG_USE_REF); if (err < 0) { av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to split " "VVCC array %d (%d NAL units of type %d).\n", i, num_nalus, nal_unit_type); return err; } err = ff_cbs_h2645_fragment_add_nals(ctx, frag, &h2645->read_packet); if (err < 0) return err; } } else { int flags = (H2645_FLAG_IS_NALFF * !!h2645->mp4) | H2645_FLAG_SMALL_PADDING | H2645_FLAG_USE_REF; // Annex B, or later MP4 with already-known parameters. err = ff_h2645_packet_split(&h2645->read_packet, frag->data, frag->data_size, ctx->log_ctx, h2645->nal_length_size, codec_id, flags); if (err < 0) return err; err = ff_cbs_h2645_fragment_add_nals(ctx, frag, &h2645->read_packet); if (err < 0) return err; } return 0; } #define cbs_h266_replace_ps(ps_name, ps_var, id_element) \ static int cbs_h266_replace_ ## ps_var(CodedBitstreamContext *ctx, \ CodedBitstreamUnit *unit) \ { \ CodedBitstreamH266Context *priv = ctx->priv_data; \ H266Raw ## ps_name *ps_var = unit->content; \ unsigned int id = ps_var->id_element; \ int err = ff_cbs_make_unit_refcounted(ctx, unit); \ if (err < 0) \ return err; \ av_assert0(unit->content_ref); \ av_refstruct_replace(&priv->ps_var[id], unit->content_ref); \ return 0; \ } cbs_h266_replace_ps(VPS, vps, vps_video_parameter_set_id) cbs_h266_replace_ps(PPS, pps, pps_pic_parameter_set_id) static int cbs_h266_replace_sps(CodedBitstreamContext *ctx, CodedBitstreamUnit *unit) { CodedBitstreamH266Context *priv = ctx->priv_data; H266RawSPS *sps = unit->content; unsigned int id = sps->sps_seq_parameter_set_id; int err = ff_cbs_make_unit_refcounted(ctx, unit); if (err < 0) return err; av_assert0(unit->content_ref); if (priv->sps[id] && memcmp(priv->sps[id], unit->content_ref, sizeof(*priv->sps[id]))) { for (unsigned int i = 0; i < VVC_MAX_PPS_COUNT; i++) { if (priv->pps[i] && priv->pps[i]->pps_seq_parameter_set_id == id) av_refstruct_unref(&priv->pps[i]); } } av_refstruct_replace(&priv->sps[id], unit->content_ref); return 0; } static int cbs_h266_replace_ph(CodedBitstreamContext *ctx, CodedBitstreamUnit *unit, H266RawPictureHeader *ph) { CodedBitstreamH266Context *h266 = ctx->priv_data; int err; err = ff_cbs_make_unit_refcounted(ctx, unit); if (err < 0) return err; av_assert0(unit->content_ref); av_refstruct_replace(&h266->ph_ref, unit->content_ref); h266->ph = ph; return 0; } static int cbs_h266_read_nal_unit(CodedBitstreamContext *ctx, CodedBitstreamUnit *unit) { GetBitContext gbc; int err; CodedBitstreamH266Context *h266 = ctx->priv_data; err = init_get_bits8(&gbc, unit->data, unit->data_size); if (err < 0) return err; err = ff_cbs_alloc_unit_content(ctx, unit); if (err < 0) return err; switch (unit->type) { case VVC_DCI_NUT: { err = cbs_h266_read_dci(ctx, &gbc, unit->content); if (err < 0) return err; } break; case VVC_OPI_NUT: { err = cbs_h266_read_opi(ctx, &gbc, unit->content); if (err < 0) return err; } break; case VVC_VPS_NUT: { H266RawVPS *vps = unit->content; err = cbs_h266_read_vps(ctx, &gbc, vps); if (err < 0) return err; err = cbs_h266_replace_vps(ctx, unit); if (err < 0) return err; } break; case VVC_SPS_NUT: { H266RawSPS *sps = unit->content; err = cbs_h266_read_sps(ctx, &gbc, sps); if (err < 0) return err; err = cbs_h266_replace_sps(ctx, unit); if (err < 0) return err; } break; case VVC_PPS_NUT: { H266RawPPS *pps = unit->content; err = cbs_h266_read_pps(ctx, &gbc, pps); if (err < 0) return err; err = cbs_h266_replace_pps(ctx, unit); if (err < 0) return err; } break; case VVC_PREFIX_APS_NUT: case VVC_SUFFIX_APS_NUT: { err = cbs_h266_read_aps(ctx, &gbc, unit->content, unit->type == VVC_PREFIX_APS_NUT); if (err < 0) return err; } break; case VVC_PH_NUT: { H266RawPH *ph = unit->content; err = cbs_h266_read_ph(ctx, &gbc, ph); if (err < 0) return err; err = cbs_h266_replace_ph(ctx, unit, &ph->ph_picture_header); if (err < 0) return err; } break; case VVC_TRAIL_NUT: case VVC_STSA_NUT: case VVC_RADL_NUT: case VVC_RASL_NUT: case VVC_IDR_W_RADL: case VVC_IDR_N_LP: case VVC_CRA_NUT: case VVC_GDR_NUT: { H266RawSlice *slice = unit->content; int pos, len; err = cbs_h266_read_slice_header(ctx, &gbc, &slice->header); if (err < 0) return err; if (!ff_cbs_h2645_read_more_rbsp_data(&gbc)) return AVERROR_INVALIDDATA; pos = get_bits_count(&gbc); len = unit->data_size; if (slice->header.sh_picture_header_in_slice_header_flag) { err = cbs_h266_replace_ph(ctx, unit, &slice->header.sh_picture_header); if (err < 0) return err; slice->ph_ref = NULL; } else { slice->ph_ref = av_refstruct_ref(h266->ph_ref); } slice->ph = h266->ph; slice->pps = av_refstruct_ref(h266->pps[slice->ph->ph_pic_parameter_set_id]); slice->sps = av_refstruct_ref(h266->sps[slice->pps->pps_seq_parameter_set_id]); slice->header_size = pos / 8; slice->data_size = len - pos / 8; slice->data_ref = av_buffer_ref(unit->data_ref); if (!slice->data_ref) return AVERROR(ENOMEM); slice->data = unit->data + pos / 8; slice->data_bit_start = pos % 8; } break; case VVC_AUD_NUT: { err = cbs_h266_read_aud(ctx, &gbc, unit->content); if (err < 0) return err; } break; case VVC_PREFIX_SEI_NUT: case VVC_SUFFIX_SEI_NUT: { err = cbs_h266_read_sei(ctx, &gbc, unit->content, unit->type == VVC_PREFIX_SEI_NUT); if (err < 0) return err; } break; default: return AVERROR(ENOSYS); } return 0; } static int cbs_h266_write_nal_unit(CodedBitstreamContext *ctx, CodedBitstreamUnit *unit, PutBitContext *pbc) { int err; switch (unit->type) { case VVC_DCI_NUT: { H266RawDCI *dci = unit->content; err = cbs_h266_write_dci(ctx, pbc, dci); if (err < 0) return err; } break; case VVC_OPI_NUT: { H266RawOPI *opi = unit->content; err = cbs_h266_write_opi(ctx, pbc, opi); if (err < 0) return err; } break; case VVC_VPS_NUT: { H266RawVPS *vps = unit->content; err = cbs_h266_write_vps(ctx, pbc, vps); if (err < 0) return err; err = cbs_h266_replace_vps(ctx, unit); if (err < 0) return err; } break; case VVC_SPS_NUT: { H266RawSPS *sps = unit->content; err = cbs_h266_write_sps(ctx, pbc, sps); if (err < 0) return err; err = cbs_h266_replace_sps(ctx, unit); if (err < 0) return err; } break; case VVC_PPS_NUT: { H266RawPPS *pps = unit->content; err = cbs_h266_write_pps(ctx, pbc, pps); if (err < 0) return err; err = cbs_h266_replace_pps(ctx, unit); if (err < 0) return err; } break; case VVC_PREFIX_APS_NUT: case VVC_SUFFIX_APS_NUT: { err = cbs_h266_write_aps(ctx, pbc, unit->content, unit->type == VVC_PREFIX_APS_NUT); if (err < 0) return err; } break; case VVC_PH_NUT: { H266RawPH *ph = unit->content; err = cbs_h266_write_ph(ctx, pbc, ph); if (err < 0) return err; err = cbs_h266_replace_ph(ctx, unit, &ph->ph_picture_header); if (err < 0) return err; } break; case VVC_TRAIL_NUT: case VVC_STSA_NUT: case VVC_RADL_NUT: case VVC_RASL_NUT: case VVC_IDR_W_RADL: case VVC_IDR_N_LP: case VVC_CRA_NUT: case VVC_GDR_NUT: { H266RawSlice *slice = unit->content; err = cbs_h266_write_slice_header(ctx, pbc, &slice->header); if (err < 0) return err; if (slice->header.sh_picture_header_in_slice_header_flag) { err = cbs_h266_replace_ph(ctx, unit, &slice->header.sh_picture_header); if (err < 0) return err; } if (slice->data) { err = ff_cbs_h2645_write_slice_data(ctx, pbc, slice->data, slice->data_size, slice->data_bit_start); if (err < 0) return err; } else { // No slice data - that was just the header. } } break; case VVC_AUD_NUT: { err = cbs_h266_write_aud(ctx, pbc, unit->content); if (err < 0) return err; } break; case VVC_PREFIX_SEI_NUT: case VVC_SUFFIX_SEI_NUT: { err = cbs_h266_write_sei(ctx, pbc, unit->content, unit->type == VVC_PREFIX_SEI_NUT); 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 av_cold void cbs_h266_flush(CodedBitstreamContext *ctx) { CodedBitstreamH266Context *h266 = ctx->priv_data; for (int i = 0; i < FF_ARRAY_ELEMS(h266->vps); i++) av_refstruct_unref(&h266->vps[i]); for (int i = 0; i < FF_ARRAY_ELEMS(h266->sps); i++) av_refstruct_unref(&h266->sps[i]); for (int i = 0; i < FF_ARRAY_ELEMS(h266->pps); i++) av_refstruct_unref(&h266->pps[i]); av_refstruct_unref(&h266->ph_ref); } static av_cold void cbs_h266_close(CodedBitstreamContext *ctx) { CodedBitstreamH266Context *h266 = ctx->priv_data; cbs_h266_flush(ctx); ff_h2645_packet_uninit(&h266->common.read_packet); } static void cbs_h266_free_slice(AVRefStructOpaque unused, void *content) { H266RawSlice *slice = content; av_buffer_unref(&slice->data_ref); av_refstruct_unref(&slice->sps); av_refstruct_unref(&slice->pps); av_refstruct_unref(&slice->ph_ref); } static void cbs_h266_free_sei(AVRefStructOpaque unused, void *content) { H266RawSEI *sei = content; ff_cbs_sei_free_message_list(&sei->message_list); } static CodedBitstreamUnitTypeDescriptor cbs_h266_unit_types[] = { CBS_UNIT_TYPE_INTERNAL_REF(VVC_DCI_NUT, H266RawDCI, extension_data.data), CBS_UNIT_TYPE_INTERNAL_REF(VVC_OPI_NUT, H266RawOPI, extension_data.data), CBS_UNIT_TYPE_INTERNAL_REF(VVC_VPS_NUT, H266RawVPS, extension_data.data), { .nb_unit_types = 1, .unit_type.list[0] = VVC_SPS_NUT, .content_type = CBS_CONTENT_TYPE_INTERNAL_REFS, .content_size = sizeof(H266RawSPS), .type.ref = { .nb_offsets = 2, .offsets = { offsetof(H266RawSPS, extension_data.data), offsetof(H266RawSPS, vui.extension_data.data) } }, }, CBS_UNIT_TYPE_INTERNAL_REF(VVC_PPS_NUT, H266RawPPS, extension_data.data), CBS_UNIT_TYPE_INTERNAL_REF(VVC_PREFIX_APS_NUT, H266RawAPS, extension_data.data), CBS_UNIT_TYPE_INTERNAL_REF(VVC_SUFFIX_APS_NUT, H266RawAPS, extension_data.data), CBS_UNIT_TYPE_POD(VVC_PH_NUT , H266RawPH), CBS_UNIT_TYPE_POD(VVC_AUD_NUT, H266RawAUD), CBS_UNIT_TYPES_COMPLEX((VVC_TRAIL_NUT, VVC_STSA_NUT, VVC_RADL_NUT), H266RawSlice, cbs_h266_free_slice), CBS_UNIT_TYPES_COMPLEX((VVC_RASL_NUT, VVC_IDR_W_RADL, VVC_IDR_N_LP), H266RawSlice, cbs_h266_free_slice), CBS_UNIT_TYPES_COMPLEX((VVC_CRA_NUT, VVC_GDR_NUT), H266RawSlice, cbs_h266_free_slice), CBS_UNIT_TYPES_COMPLEX((VVC_PREFIX_SEI_NUT, VVC_SUFFIX_SEI_NUT), H266RawSEI, cbs_h266_free_sei), CBS_UNIT_TYPE_END_OF_LIST }; const CodedBitstreamType ff_cbs_type_h266 = { .codec_id = AV_CODEC_ID_VVC, .priv_data_size = sizeof(CodedBitstreamH266Context), .unit_types = cbs_h266_unit_types, .split_fragment = &cbs_h266_split_fragment, .read_unit = &cbs_h266_read_nal_unit, .write_unit = &cbs_h266_write_nal_unit, .assemble_fragment = &ff_cbs_h2645_assemble_fragment, .flush = &cbs_h266_flush, .close = &cbs_h266_close, };