2 * This file is part of FFmpeg.
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 #include "libavutil/avassert.h"
20 #include "libavutil/pixfmt.h"
23 #include "cbs_internal.h"
28 static int cbs_av1_read_uvlc(CodedBitstreamContext *ctx, GetBitContext *gbc,
29 const char *name, uint32_t *write_to,
30 uint32_t range_min, uint32_t range_max)
32 uint32_t zeroes, bits_value, value;
35 if (ctx->trace_enable)
36 position = get_bits_count(gbc);
40 if (get_bits_left(gbc) < 1) {
41 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid uvlc code at "
42 "%s: bitstream ended.\n", name);
43 return AVERROR_INVALIDDATA;
52 value = MAX_UINT_BITS(32);
54 if (get_bits_left(gbc) < zeroes) {
55 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid uvlc code at "
56 "%s: bitstream ended.\n", name);
57 return AVERROR_INVALIDDATA;
60 bits_value = get_bits_long(gbc, zeroes);
61 value = bits_value + (UINT32_C(1) << zeroes) - 1;
64 if (ctx->trace_enable) {
70 k = FFMIN(zeroes - 32, 32);
71 for (i = 0; i < k; i++)
74 ff_cbs_trace_syntax_element(ctx, position, name,
81 for (i = 0; i < zeroes; i++)
86 for (j = 0; j < zeroes; j++)
87 bits[i++] = (bits_value >> (zeroes - j - 1) & 1) ? '1' : '0';
91 ff_cbs_trace_syntax_element(ctx, position, name,
95 if (value < range_min || value > range_max) {
96 av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
97 "%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
98 name, value, range_min, range_max);
99 return AVERROR_INVALIDDATA;
106 static int cbs_av1_write_uvlc(CodedBitstreamContext *ctx, PutBitContext *pbc,
107 const char *name, uint32_t value,
108 uint32_t range_min, uint32_t range_max)
111 int position, zeroes;
113 if (value < range_min || value > range_max) {
114 av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
115 "%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
116 name, value, range_min, range_max);
117 return AVERROR_INVALIDDATA;
120 if (ctx->trace_enable)
121 position = put_bits_count(pbc);
123 zeroes = av_log2(value + 1);
124 v = value - (1U << zeroes) + 1;
125 put_bits(pbc, zeroes, 0);
127 put_bits(pbc, zeroes, v);
129 if (ctx->trace_enable) {
133 for (j = 0; j < zeroes; j++)
136 for (j = 0; j < zeroes; j++)
137 bits[i++] = (v >> (zeroes - j - 1) & 1) ? '1' : '0';
139 ff_cbs_trace_syntax_element(ctx, position, name, NULL,
146 static int cbs_av1_read_leb128(CodedBitstreamContext *ctx, GetBitContext *gbc,
147 const char *name, uint64_t *write_to)
150 int position, err, i;
152 if (ctx->trace_enable)
153 position = get_bits_count(gbc);
156 for (i = 0; i < 8; i++) {
157 int subscript[2] = { 1, i };
159 err = ff_cbs_read_unsigned(ctx, gbc, 8, "leb128_byte[i]", subscript,
164 value |= (uint64_t)(byte & 0x7f) << (i * 7);
169 if (value > UINT32_MAX)
170 return AVERROR_INVALIDDATA;
172 if (ctx->trace_enable)
173 ff_cbs_trace_syntax_element(ctx, position, name, NULL, "", value);
179 static int cbs_av1_write_leb128(CodedBitstreamContext *ctx, PutBitContext *pbc,
180 const char *name, uint64_t value)
182 int position, err, len, i;
185 len = (av_log2(value) + 7) / 7;
187 if (ctx->trace_enable)
188 position = put_bits_count(pbc);
190 for (i = 0; i < len; i++) {
191 int subscript[2] = { 1, i };
193 byte = value >> (7 * i) & 0x7f;
197 err = ff_cbs_write_unsigned(ctx, pbc, 8, "leb128_byte[i]", subscript,
203 if (ctx->trace_enable)
204 ff_cbs_trace_syntax_element(ctx, position, name, NULL, "", value);
209 static int cbs_av1_read_ns(CodedBitstreamContext *ctx, GetBitContext *gbc,
210 uint32_t n, const char *name,
211 const int *subscripts, uint32_t *write_to)
213 uint32_t m, v, extra_bit, value;
218 if (ctx->trace_enable)
219 position = get_bits_count(gbc);
224 if (get_bits_left(gbc) < w) {
225 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid non-symmetric value at "
226 "%s: bitstream ended.\n", name);
227 return AVERROR_INVALIDDATA;
231 v = get_bits(gbc, w - 1);
238 extra_bit = get_bits1(gbc);
239 value = (v << 1) - m + extra_bit;
242 if (ctx->trace_enable) {
245 for (i = 0; i < w - 1; i++)
246 bits[i] = (v >> i & 1) ? '1' : '0';
248 bits[i++] = extra_bit ? '1' : '0';
251 ff_cbs_trace_syntax_element(ctx, position,
252 name, subscripts, bits, value);
259 static int cbs_av1_write_ns(CodedBitstreamContext *ctx, PutBitContext *pbc,
260 uint32_t n, const char *name,
261 const int *subscripts, uint32_t value)
263 uint32_t w, m, v, extra_bit;
267 av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
268 "%"PRIu32", but must be in [0,%"PRIu32"].\n",
270 return AVERROR_INVALIDDATA;
273 if (ctx->trace_enable)
274 position = put_bits_count(pbc);
279 if (put_bits_left(pbc) < w)
280 return AVERROR(ENOSPC);
284 put_bits(pbc, w - 1, v);
286 v = m + ((value - m) >> 1);
287 extra_bit = (value - m) & 1;
288 put_bits(pbc, w - 1, v);
289 put_bits(pbc, 1, extra_bit);
292 if (ctx->trace_enable) {
295 for (i = 0; i < w - 1; i++)
296 bits[i] = (v >> i & 1) ? '1' : '0';
298 bits[i++] = extra_bit ? '1' : '0';
301 ff_cbs_trace_syntax_element(ctx, position,
302 name, subscripts, bits, value);
308 static int cbs_av1_read_increment(CodedBitstreamContext *ctx, GetBitContext *gbc,
309 uint32_t range_min, uint32_t range_max,
310 const char *name, uint32_t *write_to)
316 av_assert0(range_min <= range_max && range_max - range_min < sizeof(bits) - 1);
317 if (ctx->trace_enable)
318 position = get_bits_count(gbc);
320 for (i = 0, value = range_min; value < range_max;) {
321 if (get_bits_left(gbc) < 1) {
322 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid increment value at "
323 "%s: bitstream ended.\n", name);
324 return AVERROR_INVALIDDATA;
326 if (get_bits1(gbc)) {
335 if (ctx->trace_enable) {
337 ff_cbs_trace_syntax_element(ctx, position,
338 name, NULL, bits, value);
345 static int cbs_av1_write_increment(CodedBitstreamContext *ctx, PutBitContext *pbc,
346 uint32_t range_min, uint32_t range_max,
347 const char *name, uint32_t value)
351 av_assert0(range_min <= range_max && range_max - range_min < 32);
352 if (value < range_min || value > range_max) {
353 av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
354 "%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
355 name, value, range_min, range_max);
356 return AVERROR_INVALIDDATA;
359 if (value == range_max)
360 len = range_max - range_min;
362 len = value - range_min + 1;
363 if (put_bits_left(pbc) < len)
364 return AVERROR(ENOSPC);
366 if (ctx->trace_enable) {
369 for (i = 0; i < len; i++) {
370 if (range_min + i == value)
376 ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc),
377 name, NULL, bits, value);
381 put_bits(pbc, len, (1 << len) - 1 - (value != range_max));
386 static int cbs_av1_read_subexp(CodedBitstreamContext *ctx, GetBitContext *gbc,
387 uint32_t range_max, const char *name,
388 const int *subscripts, uint32_t *write_to)
392 uint32_t max_len, len, range_offset, range_bits;
394 if (ctx->trace_enable)
395 position = get_bits_count(gbc);
397 av_assert0(range_max > 0);
398 max_len = av_log2(range_max - 1) - 3;
400 err = cbs_av1_read_increment(ctx, gbc, 0, max_len,
401 "subexp_more_bits", &len);
406 range_bits = 2 + len;
407 range_offset = 1 << range_bits;
414 err = ff_cbs_read_unsigned(ctx, gbc, range_bits,
415 "subexp_bits", NULL, &value,
416 0, MAX_UINT_BITS(range_bits));
421 err = cbs_av1_read_ns(ctx, gbc, range_max - range_offset,
422 "subexp_final_bits", NULL, &value);
426 value += range_offset;
428 if (ctx->trace_enable)
429 ff_cbs_trace_syntax_element(ctx, position,
430 name, subscripts, "", value);
436 static int cbs_av1_write_subexp(CodedBitstreamContext *ctx, PutBitContext *pbc,
437 uint32_t range_max, const char *name,
438 const int *subscripts, uint32_t value)
441 uint32_t max_len, len, range_offset, range_bits;
443 if (value > range_max) {
444 av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
445 "%"PRIu32", but must be in [0,%"PRIu32"].\n",
446 name, value, range_max);
447 return AVERROR_INVALIDDATA;
450 if (ctx->trace_enable)
451 position = put_bits_count(pbc);
453 av_assert0(range_max > 0);
454 max_len = av_log2(range_max - 1) - 3;
461 range_bits = av_log2(value);
462 len = range_bits - 2;
464 // The top bin is combined with the one below it.
465 av_assert0(len == max_len + 1);
469 range_offset = 1 << range_bits;
472 err = cbs_av1_write_increment(ctx, pbc, 0, max_len,
473 "subexp_more_bits", len);
478 err = ff_cbs_write_unsigned(ctx, pbc, range_bits,
480 value - range_offset,
481 0, MAX_UINT_BITS(range_bits));
486 err = cbs_av1_write_ns(ctx, pbc, range_max - range_offset,
487 "subexp_final_bits", NULL,
488 value - range_offset);
493 if (ctx->trace_enable)
494 ff_cbs_trace_syntax_element(ctx, position,
495 name, subscripts, "", value);
501 static int cbs_av1_tile_log2(int blksize, int target)
504 for (k = 0; (blksize << k) < target; k++);
508 static int cbs_av1_get_relative_dist(const AV1RawSequenceHeader *seq,
509 unsigned int a, unsigned int b)
511 unsigned int diff, m;
512 if (!seq->enable_order_hint)
515 m = 1 << seq->order_hint_bits_minus_1;
516 diff = (diff & (m - 1)) - (diff & m);
520 static size_t cbs_av1_get_payload_bytes_left(GetBitContext *gbc)
522 GetBitContext tmp = *gbc;
524 for (int i = 0; get_bits_left(&tmp) >= 8; i++) {
525 if (get_bits(&tmp, 8))
532 #define HEADER(name) do { \
533 ff_cbs_trace_header(ctx, name); \
536 #define CHECK(call) do { \
542 #define FUNC_NAME(rw, codec, name) cbs_ ## codec ## _ ## rw ## _ ## name
543 #define FUNC_AV1(rw, name) FUNC_NAME(rw, av1, name)
544 #define FUNC(name) FUNC_AV1(READWRITE, name)
546 #define SUBSCRIPTS(subs, ...) (subs > 0 ? ((int[subs + 1]){ subs, __VA_ARGS__ }) : NULL)
548 #define fb(width, name) \
549 xf(width, name, current->name, 0, MAX_UINT_BITS(width), 0, )
550 #define fc(width, name, range_min, range_max) \
551 xf(width, name, current->name, range_min, range_max, 0, )
552 #define flag(name) fb(1, name)
553 #define su(width, name) \
554 xsu(width, name, current->name, 0, )
556 #define fbs(width, name, subs, ...) \
557 xf(width, name, current->name, 0, MAX_UINT_BITS(width), subs, __VA_ARGS__)
558 #define fcs(width, name, range_min, range_max, subs, ...) \
559 xf(width, name, current->name, range_min, range_max, subs, __VA_ARGS__)
560 #define flags(name, subs, ...) \
561 xf(1, name, current->name, 0, 1, subs, __VA_ARGS__)
562 #define sus(width, name, subs, ...) \
563 xsu(width, name, current->name, subs, __VA_ARGS__)
565 #define fixed(width, name, value) do { \
566 av_unused uint32_t fixed_value = value; \
567 xf(width, name, fixed_value, value, value, 0, ); \
572 #define READWRITE read
573 #define RWContext GetBitContext
575 #define xf(width, name, var, range_min, range_max, subs, ...) do { \
577 CHECK(ff_cbs_read_unsigned(ctx, rw, width, #name, \
578 SUBSCRIPTS(subs, __VA_ARGS__), \
579 &value, range_min, range_max)); \
583 #define xsu(width, name, var, subs, ...) do { \
585 CHECK(ff_cbs_read_signed(ctx, rw, width, #name, \
586 SUBSCRIPTS(subs, __VA_ARGS__), &value, \
587 MIN_INT_BITS(width), \
588 MAX_INT_BITS(width))); \
592 #define uvlc(name, range_min, range_max) do { \
594 CHECK(cbs_av1_read_uvlc(ctx, rw, #name, \
595 &value, range_min, range_max)); \
596 current->name = value; \
599 #define ns(max_value, name, subs, ...) do { \
601 CHECK(cbs_av1_read_ns(ctx, rw, max_value, #name, \
602 SUBSCRIPTS(subs, __VA_ARGS__), &value)); \
603 current->name = value; \
606 #define increment(name, min, max) do { \
608 CHECK(cbs_av1_read_increment(ctx, rw, min, max, #name, &value)); \
609 current->name = value; \
612 #define subexp(name, max, subs, ...) do { \
614 CHECK(cbs_av1_read_subexp(ctx, rw, max, #name, \
615 SUBSCRIPTS(subs, __VA_ARGS__), &value)); \
616 current->name = value; \
619 #define delta_q(name) do { \
620 uint8_t delta_coded; \
622 xf(1, name.delta_coded, delta_coded, 0, 1, 0, ); \
624 xsu(1 + 6, name.delta_q, delta_q, 0, ); \
627 current->name = delta_q; \
630 #define leb128(name) do { \
632 CHECK(cbs_av1_read_leb128(ctx, rw, #name, &value)); \
633 current->name = value; \
636 #define infer(name, value) do { \
637 current->name = value; \
640 #define byte_alignment(rw) (get_bits_count(rw) % 8)
642 #include "cbs_av1_syntax_template.c"
656 #undef byte_alignment
660 #define READWRITE write
661 #define RWContext PutBitContext
663 #define xf(width, name, var, range_min, range_max, subs, ...) do { \
664 CHECK(ff_cbs_write_unsigned(ctx, rw, width, #name, \
665 SUBSCRIPTS(subs, __VA_ARGS__), \
666 var, range_min, range_max)); \
669 #define xsu(width, name, var, subs, ...) do { \
670 CHECK(ff_cbs_write_signed(ctx, rw, width, #name, \
671 SUBSCRIPTS(subs, __VA_ARGS__), var, \
672 MIN_INT_BITS(width), \
673 MAX_INT_BITS(width))); \
676 #define uvlc(name, range_min, range_max) do { \
677 CHECK(cbs_av1_write_uvlc(ctx, rw, #name, current->name, \
678 range_min, range_max)); \
681 #define ns(max_value, name, subs, ...) do { \
682 CHECK(cbs_av1_write_ns(ctx, rw, max_value, #name, \
683 SUBSCRIPTS(subs, __VA_ARGS__), \
687 #define increment(name, min, max) do { \
688 CHECK(cbs_av1_write_increment(ctx, rw, min, max, #name, \
692 #define subexp(name, max, subs, ...) do { \
693 CHECK(cbs_av1_write_subexp(ctx, rw, max, #name, \
694 SUBSCRIPTS(subs, __VA_ARGS__), \
698 #define delta_q(name) do { \
699 xf(1, name.delta_coded, current->name != 0, 0, 1, 0, ); \
701 xsu(1 + 6, name.delta_q, current->name, 0, ); \
704 #define leb128(name) do { \
705 CHECK(cbs_av1_write_leb128(ctx, rw, #name, current->name)); \
708 #define infer(name, value) do { \
709 if (current->name != (value)) { \
710 av_log(ctx->log_ctx, AV_LOG_ERROR, \
711 "%s does not match inferred value: " \
712 "%"PRId64", but should be %"PRId64".\n", \
713 #name, (int64_t)current->name, (int64_t)(value)); \
714 return AVERROR_INVALIDDATA; \
718 #define byte_alignment(rw) (put_bits_count(rw) % 8)
720 #include "cbs_av1_syntax_template.c"
734 #undef byte_alignment
737 static int cbs_av1_split_fragment(CodedBitstreamContext *ctx,
738 CodedBitstreamFragment *frag,
747 // Don't include this parsing in trace output.
748 trace = ctx->trace_enable;
749 ctx->trace_enable = 0;
752 size = frag->data_size;
754 if (INT_MAX / 8 < size) {
755 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid fragment: "
756 "too large (%"SIZE_SPECIFIER" bytes).\n", size);
757 err = AVERROR_INVALIDDATA;
762 AV1RawOBUHeader header;
765 init_get_bits(&gbc, data, 8 * size);
767 err = cbs_av1_read_obu_header(ctx, &gbc, &header);
771 if (header.obu_has_size_field) {
772 if (get_bits_left(&gbc) < 8) {
773 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid OBU: fragment "
774 "too short (%"SIZE_SPECIFIER" bytes).\n", size);
775 err = AVERROR_INVALIDDATA;
778 err = cbs_av1_read_leb128(ctx, &gbc, "obu_size", &obu_size);
782 obu_size = size - 1 - header.obu_extension_flag;
784 pos = get_bits_count(&gbc);
785 av_assert0(pos % 8 == 0 && pos / 8 <= size);
787 obu_length = pos / 8 + obu_size;
789 if (size < obu_length) {
790 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid OBU length: "
791 "%"PRIu64", but only %"SIZE_SPECIFIER" bytes remaining in fragment.\n",
793 err = AVERROR_INVALIDDATA;
797 err = ff_cbs_insert_unit_data(frag, -1, header.obu_type,
798 data, obu_length, frag->data_ref);
808 ctx->trace_enable = trace;
812 static int cbs_av1_ref_tile_data(CodedBitstreamContext *ctx,
813 CodedBitstreamUnit *unit,
819 pos = get_bits_count(gbc);
820 if (pos >= 8 * unit->data_size) {
821 av_log(ctx->log_ctx, AV_LOG_ERROR, "Bitstream ended before "
822 "any data in tile group (%d bits read).\n", pos);
823 return AVERROR_INVALIDDATA;
825 // Must be byte-aligned at this point.
826 av_assert0(pos % 8 == 0);
828 td->data_ref = av_buffer_ref(unit->data_ref);
830 return AVERROR(ENOMEM);
832 td->data = unit->data + pos / 8;
833 td->data_size = unit->data_size - pos / 8;
838 static int cbs_av1_read_unit(CodedBitstreamContext *ctx,
839 CodedBitstreamUnit *unit)
841 CodedBitstreamAV1Context *priv = ctx->priv_data;
844 int err, start_pos, end_pos;
846 err = ff_cbs_alloc_unit_content2(ctx, unit);
851 err = init_get_bits(&gbc, unit->data, 8 * unit->data_size);
855 err = cbs_av1_read_obu_header(ctx, &gbc, &obu->header);
858 av_assert0(obu->header.obu_type == unit->type);
860 if (obu->header.obu_has_size_field) {
862 err = cbs_av1_read_leb128(ctx, &gbc, "obu_size", &obu_size);
865 obu->obu_size = obu_size;
867 if (unit->data_size < 1 + obu->header.obu_extension_flag) {
868 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid OBU length: "
869 "unit too short (%"SIZE_SPECIFIER").\n", unit->data_size);
870 return AVERROR_INVALIDDATA;
872 obu->obu_size = unit->data_size - 1 - obu->header.obu_extension_flag;
875 start_pos = get_bits_count(&gbc);
877 if (obu->header.obu_extension_flag) {
878 if (obu->header.obu_type != AV1_OBU_SEQUENCE_HEADER &&
879 obu->header.obu_type != AV1_OBU_TEMPORAL_DELIMITER &&
880 priv->operating_point_idc) {
881 int in_temporal_layer =
882 (priv->operating_point_idc >> priv->temporal_id ) & 1;
883 int in_spatial_layer =
884 (priv->operating_point_idc >> (priv->spatial_id + 8)) & 1;
885 if (!in_temporal_layer || !in_spatial_layer) {
886 // Decoding will drop this OBU at this operating point.
891 switch (obu->header.obu_type) {
892 case AV1_OBU_SEQUENCE_HEADER:
894 err = cbs_av1_read_sequence_header_obu(ctx, &gbc,
895 &obu->obu.sequence_header);
899 av_buffer_unref(&priv->sequence_header_ref);
900 priv->sequence_header = NULL;
902 priv->sequence_header_ref = av_buffer_ref(unit->content_ref);
903 if (!priv->sequence_header_ref)
904 return AVERROR(ENOMEM);
905 priv->sequence_header = &obu->obu.sequence_header;
908 case AV1_OBU_TEMPORAL_DELIMITER:
910 err = cbs_av1_read_temporal_delimiter_obu(ctx, &gbc);
915 case AV1_OBU_FRAME_HEADER:
916 case AV1_OBU_REDUNDANT_FRAME_HEADER:
918 err = cbs_av1_read_frame_header_obu(ctx, &gbc,
919 &obu->obu.frame_header,
920 obu->header.obu_type ==
921 AV1_OBU_REDUNDANT_FRAME_HEADER,
927 case AV1_OBU_TILE_GROUP:
929 err = cbs_av1_read_tile_group_obu(ctx, &gbc,
930 &obu->obu.tile_group);
934 err = cbs_av1_ref_tile_data(ctx, unit, &gbc,
935 &obu->obu.tile_group.tile_data);
942 err = cbs_av1_read_frame_obu(ctx, &gbc, &obu->obu.frame,
947 err = cbs_av1_ref_tile_data(ctx, unit, &gbc,
948 &obu->obu.frame.tile_group.tile_data);
953 case AV1_OBU_TILE_LIST:
955 err = cbs_av1_read_tile_list_obu(ctx, &gbc,
956 &obu->obu.tile_list);
960 err = cbs_av1_ref_tile_data(ctx, unit, &gbc,
961 &obu->obu.tile_list.tile_data);
966 case AV1_OBU_METADATA:
968 err = cbs_av1_read_metadata_obu(ctx, &gbc, &obu->obu.metadata);
973 case AV1_OBU_PADDING:
975 err = cbs_av1_read_padding_obu(ctx, &gbc, &obu->obu.padding);
981 return AVERROR(ENOSYS);
984 end_pos = get_bits_count(&gbc);
985 av_assert0(end_pos <= unit->data_size * 8);
987 if (obu->obu_size > 0 &&
988 obu->header.obu_type != AV1_OBU_TILE_GROUP &&
989 obu->header.obu_type != AV1_OBU_TILE_LIST &&
990 obu->header.obu_type != AV1_OBU_FRAME) {
991 int nb_bits = obu->obu_size * 8 + start_pos - end_pos;
994 return AVERROR_INVALIDDATA;
996 err = cbs_av1_read_trailing_bits(ctx, &gbc, nb_bits);
1004 static int cbs_av1_write_obu(CodedBitstreamContext *ctx,
1005 CodedBitstreamUnit *unit,
1008 CodedBitstreamAV1Context *priv = ctx->priv_data;
1009 AV1RawOBU *obu = unit->content;
1010 PutBitContext pbc_tmp;
1013 int err, start_pos, end_pos, data_pos;
1015 // OBUs in the normal bitstream format must contain a size field
1016 // in every OBU (in annex B it is optional, but we don't support
1018 obu->header.obu_has_size_field = 1;
1020 err = cbs_av1_write_obu_header(ctx, pbc, &obu->header);
1024 if (obu->header.obu_has_size_field) {
1026 // Add space for the size field to fill later.
1032 start_pos = put_bits_count(pbc);
1034 switch (obu->header.obu_type) {
1035 case AV1_OBU_SEQUENCE_HEADER:
1037 err = cbs_av1_write_sequence_header_obu(ctx, pbc,
1038 &obu->obu.sequence_header);
1042 av_buffer_unref(&priv->sequence_header_ref);
1043 priv->sequence_header = NULL;
1045 priv->sequence_header_ref = av_buffer_ref(unit->content_ref);
1046 if (!priv->sequence_header_ref)
1047 return AVERROR(ENOMEM);
1048 priv->sequence_header = &obu->obu.sequence_header;
1051 case AV1_OBU_TEMPORAL_DELIMITER:
1053 err = cbs_av1_write_temporal_delimiter_obu(ctx, pbc);
1058 case AV1_OBU_FRAME_HEADER:
1059 case AV1_OBU_REDUNDANT_FRAME_HEADER:
1061 err = cbs_av1_write_frame_header_obu(ctx, pbc,
1062 &obu->obu.frame_header,
1063 obu->header.obu_type ==
1064 AV1_OBU_REDUNDANT_FRAME_HEADER,
1070 case AV1_OBU_TILE_GROUP:
1072 err = cbs_av1_write_tile_group_obu(ctx, pbc,
1073 &obu->obu.tile_group);
1077 td = &obu->obu.tile_group.tile_data;
1082 err = cbs_av1_write_frame_obu(ctx, pbc, &obu->obu.frame, NULL);
1086 td = &obu->obu.frame.tile_group.tile_data;
1089 case AV1_OBU_TILE_LIST:
1091 err = cbs_av1_write_tile_list_obu(ctx, pbc, &obu->obu.tile_list);
1095 td = &obu->obu.tile_list.tile_data;
1098 case AV1_OBU_METADATA:
1100 err = cbs_av1_write_metadata_obu(ctx, pbc, &obu->obu.metadata);
1105 case AV1_OBU_PADDING:
1107 err = cbs_av1_write_padding_obu(ctx, pbc, &obu->obu.padding);
1113 return AVERROR(ENOSYS);
1116 end_pos = put_bits_count(pbc);
1117 header_size = (end_pos - start_pos + 7) / 8;
1119 obu->obu_size = header_size + td->data_size;
1120 } else if (header_size > 0) {
1121 // Add trailing bits and recalculate.
1122 err = cbs_av1_write_trailing_bits(ctx, pbc, 8 - end_pos % 8);
1125 end_pos = put_bits_count(pbc);
1126 obu->obu_size = header_size = (end_pos - start_pos + 7) / 8;
1132 end_pos = put_bits_count(pbc);
1133 // Must now be byte-aligned.
1134 av_assert0(end_pos % 8 == 0);
1135 flush_put_bits(pbc);
1140 err = cbs_av1_write_leb128(ctx, pbc, "obu_size", obu->obu_size);
1144 data_pos = put_bits_count(pbc) / 8;
1145 flush_put_bits(pbc);
1146 av_assert0(data_pos <= start_pos);
1148 if (8 * obu->obu_size > put_bits_left(pbc))
1149 return AVERROR(ENOSPC);
1151 if (obu->obu_size > 0) {
1152 memmove(pbc->buf + data_pos,
1153 pbc->buf + start_pos, header_size);
1154 skip_put_bytes(pbc, header_size);
1157 memcpy(pbc->buf + data_pos + header_size,
1158 td->data, td->data_size);
1159 skip_put_bytes(pbc, td->data_size);
1163 // OBU data must be byte-aligned.
1164 av_assert0(put_bits_count(pbc) % 8 == 0);
1169 static int cbs_av1_assemble_fragment(CodedBitstreamContext *ctx,
1170 CodedBitstreamFragment *frag)
1176 for (i = 0; i < frag->nb_units; i++)
1177 size += frag->units[i].data_size;
1179 frag->data_ref = av_buffer_alloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
1180 if (!frag->data_ref)
1181 return AVERROR(ENOMEM);
1182 frag->data = frag->data_ref->data;
1183 memset(frag->data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
1186 for (i = 0; i < frag->nb_units; i++) {
1187 memcpy(frag->data + pos, frag->units[i].data,
1188 frag->units[i].data_size);
1189 pos += frag->units[i].data_size;
1191 av_assert0(pos == size);
1192 frag->data_size = size;
1197 static void cbs_av1_close(CodedBitstreamContext *ctx)
1199 CodedBitstreamAV1Context *priv = ctx->priv_data;
1201 av_buffer_unref(&priv->sequence_header_ref);
1202 av_buffer_unref(&priv->frame_header_ref);
1205 static void cbs_av1_free_metadata(void *unit, uint8_t *content)
1207 AV1RawOBU *obu = (AV1RawOBU*)content;
1210 av_assert0(obu->header.obu_type == AV1_OBU_METADATA);
1211 md = &obu->obu.metadata;
1213 switch (md->metadata_type) {
1214 case AV1_METADATA_TYPE_ITUT_T35:
1215 av_buffer_unref(&md->metadata.itut_t35.payload_ref);
1220 static const CodedBitstreamUnitTypeDescriptor cbs_av1_unit_types[] = {
1221 CBS_UNIT_TYPE_POD(AV1_OBU_SEQUENCE_HEADER, AV1RawOBU),
1222 CBS_UNIT_TYPE_POD(AV1_OBU_TEMPORAL_DELIMITER, AV1RawOBU),
1223 CBS_UNIT_TYPE_POD(AV1_OBU_FRAME_HEADER, AV1RawOBU),
1224 CBS_UNIT_TYPE_POD(AV1_OBU_REDUNDANT_FRAME_HEADER, AV1RawOBU),
1226 CBS_UNIT_TYPE_INTERNAL_REF(AV1_OBU_TILE_GROUP, AV1RawOBU,
1227 obu.tile_group.tile_data.data),
1228 CBS_UNIT_TYPE_INTERNAL_REF(AV1_OBU_FRAME, AV1RawOBU,
1229 obu.frame.tile_group.tile_data.data),
1230 CBS_UNIT_TYPE_INTERNAL_REF(AV1_OBU_TILE_LIST, AV1RawOBU,
1231 obu.tile_list.tile_data.data),
1232 CBS_UNIT_TYPE_INTERNAL_REF(AV1_OBU_PADDING, AV1RawOBU,
1233 obu.padding.payload),
1235 CBS_UNIT_TYPE_COMPLEX(AV1_OBU_METADATA, AV1RawOBU,
1236 &cbs_av1_free_metadata),
1238 CBS_UNIT_TYPE_END_OF_LIST
1241 const CodedBitstreamType ff_cbs_type_av1 = {
1242 .codec_id = AV_CODEC_ID_AV1,
1244 .priv_data_size = sizeof(CodedBitstreamAV1Context),
1246 .unit_types = cbs_av1_unit_types,
1248 .split_fragment = &cbs_av1_split_fragment,
1249 .read_unit = &cbs_av1_read_unit,
1250 .write_unit = &cbs_av1_write_obu,
1251 .assemble_fragment = &cbs_av1_assemble_fragment,
1253 .close = &cbs_av1_close,