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);
127 zeroes = av_log2(value + 1);
128 v = value - (1 << zeroes) + 1;
129 put_bits(pbc, zeroes + 1, 1);
130 put_bits(pbc, zeroes, v);
133 if (ctx->trace_enable) {
137 for (j = 0; j < zeroes; j++)
140 for (j = 0; j < zeroes; j++)
141 bits[i++] = (v >> (zeroes - j - 1) & 1) ? '1' : '0';
143 ff_cbs_trace_syntax_element(ctx, position, name, NULL,
150 static int cbs_av1_read_leb128(CodedBitstreamContext *ctx, GetBitContext *gbc,
151 const char *name, uint64_t *write_to)
154 int position, err, i;
156 if (ctx->trace_enable)
157 position = get_bits_count(gbc);
160 for (i = 0; i < 8; i++) {
161 int subscript[2] = { 1, i };
163 err = ff_cbs_read_unsigned(ctx, gbc, 8, "leb128_byte[i]", subscript,
168 value |= (uint64_t)(byte & 0x7f) << (i * 7);
173 if (ctx->trace_enable)
174 ff_cbs_trace_syntax_element(ctx, position, name, NULL, "", value);
180 static int cbs_av1_write_leb128(CodedBitstreamContext *ctx, PutBitContext *pbc,
181 const char *name, uint64_t value)
183 int position, err, len, i;
186 len = (av_log2(value) + 7) / 7;
188 if (ctx->trace_enable)
189 position = put_bits_count(pbc);
191 for (i = 0; i < len; i++) {
192 int subscript[2] = { 1, i };
194 byte = value >> (7 * i) & 0x7f;
198 err = ff_cbs_write_unsigned(ctx, pbc, 8, "leb128_byte[i]", subscript,
204 if (ctx->trace_enable)
205 ff_cbs_trace_syntax_element(ctx, position, name, NULL, "", value);
210 static int cbs_av1_read_ns(CodedBitstreamContext *ctx, GetBitContext *gbc,
211 uint32_t n, const char *name,
212 const int *subscripts, uint32_t *write_to)
214 uint32_t w, m, v, extra_bit, value;
219 if (ctx->trace_enable)
220 position = get_bits_count(gbc);
225 if (get_bits_left(gbc) < w) {
226 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid non-symmetric value at "
227 "%s: bitstream ended.\n", name);
228 return AVERROR_INVALIDDATA;
232 v = get_bits(gbc, w - 1);
239 extra_bit = get_bits1(gbc);
240 value = (v << 1) - m + extra_bit;
243 if (ctx->trace_enable) {
246 for (i = 0; i < w - 1; i++)
247 bits[i] = (v >> i & 1) ? '1' : '0';
249 bits[i++] = extra_bit ? '1' : '0';
252 ff_cbs_trace_syntax_element(ctx, position,
253 name, subscripts, bits, value);
260 static int cbs_av1_write_ns(CodedBitstreamContext *ctx, PutBitContext *pbc,
261 uint32_t n, const char *name,
262 const int *subscripts, uint32_t value)
264 uint32_t w, m, v, extra_bit;
268 av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
269 "%"PRIu32", but must be in [0,%"PRIu32"].\n",
271 return AVERROR_INVALIDDATA;
274 if (ctx->trace_enable)
275 position = put_bits_count(pbc);
280 if (put_bits_left(pbc) < w)
281 return AVERROR(ENOSPC);
285 put_bits(pbc, w - 1, v);
287 v = m + ((value - m) >> 1);
288 extra_bit = (value - m) & 1;
289 put_bits(pbc, w - 1, v);
290 put_bits(pbc, 1, extra_bit);
293 if (ctx->trace_enable) {
296 for (i = 0; i < w - 1; i++)
297 bits[i] = (v >> i & 1) ? '1' : '0';
299 bits[i++] = extra_bit ? '1' : '0';
302 ff_cbs_trace_syntax_element(ctx, position,
303 name, subscripts, bits, value);
309 static int cbs_av1_read_increment(CodedBitstreamContext *ctx, GetBitContext *gbc,
310 uint32_t range_min, uint32_t range_max,
311 const char *name, uint32_t *write_to)
317 av_assert0(range_min <= range_max && range_max - range_min < sizeof(bits) - 1);
318 if (ctx->trace_enable)
319 position = get_bits_count(gbc);
321 for (i = 0, value = range_min; value < range_max;) {
322 if (get_bits_left(gbc) < 1) {
323 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid increment value at "
324 "%s: bitstream ended.\n", name);
325 return AVERROR_INVALIDDATA;
327 if (get_bits1(gbc)) {
336 if (ctx->trace_enable) {
338 ff_cbs_trace_syntax_element(ctx, position,
339 name, NULL, bits, value);
346 static int cbs_av1_write_increment(CodedBitstreamContext *ctx, PutBitContext *pbc,
347 uint32_t range_min, uint32_t range_max,
348 const char *name, uint32_t value)
352 av_assert0(range_min <= range_max && range_max - range_min < 32);
353 if (value < range_min || value > range_max) {
354 av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
355 "%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
356 name, value, range_min, range_max);
357 return AVERROR_INVALIDDATA;
360 if (value == range_max)
361 len = range_max - range_min;
363 len = value - range_min + 1;
364 if (put_bits_left(pbc) < len)
365 return AVERROR(ENOSPC);
367 if (ctx->trace_enable) {
370 for (i = 0; i < len; i++) {
371 if (range_min + i == value)
377 ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc),
378 name, NULL, bits, value);
382 put_bits(pbc, len, (1 << len) - 1 - (value != range_max));
387 static int cbs_av1_read_subexp(CodedBitstreamContext *ctx, GetBitContext *gbc,
388 uint32_t range_max, const char *name,
389 const int *subscripts, uint32_t *write_to)
393 uint32_t max_len, len, range_offset, range_bits;
395 if (ctx->trace_enable)
396 position = get_bits_count(gbc);
398 av_assert0(range_max > 0);
399 max_len = av_log2(range_max - 1) - 3;
401 err = cbs_av1_read_increment(ctx, gbc, 0, max_len,
402 "subexp_more_bits", &len);
407 range_bits = 2 + len;
408 range_offset = 1 << range_bits;
415 err = ff_cbs_read_unsigned(ctx, gbc, range_bits,
416 "subexp_bits", NULL, &value,
417 0, MAX_UINT_BITS(range_bits));
422 err = cbs_av1_read_ns(ctx, gbc, range_max - range_offset,
423 "subexp_final_bits", NULL, &value);
427 value += range_offset;
429 if (ctx->trace_enable)
430 ff_cbs_trace_syntax_element(ctx, position,
431 name, subscripts, "", value);
437 static int cbs_av1_write_subexp(CodedBitstreamContext *ctx, PutBitContext *pbc,
438 uint32_t range_max, const char *name,
439 const int *subscripts, uint32_t value)
442 uint32_t max_len, len, range_offset, range_bits;
444 if (value > range_max) {
445 av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
446 "%"PRIu32", but must be in [0,%"PRIu32"].\n",
447 name, value, range_max);
448 return AVERROR_INVALIDDATA;
451 if (ctx->trace_enable)
452 position = put_bits_count(pbc);
454 av_assert0(range_max > 0);
455 max_len = av_log2(range_max - 1) - 3;
462 range_bits = av_log2(value);
463 len = range_bits - 2;
465 // The top bin is combined with the one below it.
466 av_assert0(len == max_len + 1);
470 range_offset = 1 << range_bits;
473 err = cbs_av1_write_increment(ctx, pbc, 0, max_len,
474 "subexp_more_bits", len);
479 err = ff_cbs_write_unsigned(ctx, pbc, range_bits,
481 value - range_offset,
482 0, MAX_UINT_BITS(range_bits));
487 err = cbs_av1_write_ns(ctx, pbc, range_max - range_offset,
488 "subexp_final_bits", NULL,
489 value - range_offset);
494 if (ctx->trace_enable)
495 ff_cbs_trace_syntax_element(ctx, position,
496 name, subscripts, "", value);
502 static int cbs_av1_tile_log2(int blksize, int target)
505 for (k = 0; (blksize << k) < target; k++);
509 static int cbs_av1_get_relative_dist(const AV1RawSequenceHeader *seq,
510 unsigned int a, unsigned int b)
512 unsigned int diff, m;
513 if (!seq->enable_order_hint)
516 m = 1 << seq->order_hint_bits_minus_1;
517 diff = (diff & (m - 1)) - (diff & m);
521 static size_t cbs_av1_get_payload_bytes_left(GetBitContext *gbc)
523 GetBitContext tmp = *gbc;
525 for (int i = 0; get_bits_left(&tmp) >= 8; i++) {
526 if (get_bits(&tmp, 8))
533 #define HEADER(name) do { \
534 ff_cbs_trace_header(ctx, name); \
537 #define CHECK(call) do { \
543 #define FUNC_NAME(rw, codec, name) cbs_ ## codec ## _ ## rw ## _ ## name
544 #define FUNC_AV1(rw, name) FUNC_NAME(rw, av1, name)
545 #define FUNC(name) FUNC_AV1(READWRITE, name)
547 #define SUBSCRIPTS(subs, ...) (subs > 0 ? ((int[subs + 1]){ subs, __VA_ARGS__ }) : NULL)
549 #define fb(width, name) \
550 xf(width, name, current->name, 0, MAX_UINT_BITS(width), 0)
551 #define fc(width, name, range_min, range_max) \
552 xf(width, name, current->name, range_min, range_max, 0)
553 #define flag(name) fb(1, name)
554 #define su(width, name) \
555 xsu(width, name, current->name, 0)
557 #define fbs(width, name, subs, ...) \
558 xf(width, name, current->name, 0, MAX_UINT_BITS(width), subs, __VA_ARGS__)
559 #define fcs(width, name, range_min, range_max, subs, ...) \
560 xf(width, name, current->name, range_min, range_max, subs, __VA_ARGS__)
561 #define flags(name, subs, ...) \
562 xf(1, name, current->name, 0, 1, subs, __VA_ARGS__)
563 #define sus(width, name, subs, ...) \
564 xsu(width, name, current->name, subs, __VA_ARGS__)
566 #define fixed(width, name, value) do { \
567 av_unused uint32_t fixed_value = value; \
568 xf(width, name, fixed_value, value, value, 0); \
573 #define READWRITE read
574 #define RWContext GetBitContext
576 #define xf(width, name, var, range_min, range_max, subs, ...) do { \
578 CHECK(ff_cbs_read_unsigned(ctx, rw, width, #name, \
579 SUBSCRIPTS(subs, __VA_ARGS__), \
580 &value, range_min, range_max)); \
584 #define xsu(width, name, var, subs, ...) do { \
586 CHECK(ff_cbs_read_signed(ctx, rw, width, #name, \
587 SUBSCRIPTS(subs, __VA_ARGS__), &value, \
588 MIN_INT_BITS(width), \
589 MAX_INT_BITS(width))); \
593 #define uvlc(name, range_min, range_max) do { \
595 CHECK(cbs_av1_read_uvlc(ctx, rw, #name, \
596 &value, range_min, range_max)); \
597 current->name = value; \
600 #define ns(max_value, name, subs, ...) do { \
602 CHECK(cbs_av1_read_ns(ctx, rw, max_value, #name, \
603 SUBSCRIPTS(subs, __VA_ARGS__), &value)); \
604 current->name = value; \
607 #define increment(name, min, max) do { \
609 CHECK(cbs_av1_read_increment(ctx, rw, min, max, #name, &value)); \
610 current->name = value; \
613 #define subexp(name, max, subs, ...) do { \
615 CHECK(cbs_av1_read_subexp(ctx, rw, max, #name, \
616 SUBSCRIPTS(subs, __VA_ARGS__), &value)); \
617 current->name = value; \
620 #define delta_q(name) do { \
621 uint8_t delta_coded; \
623 xf(1, name.delta_coded, delta_coded, 0, 1, 0); \
625 xsu(1 + 6, name.delta_q, delta_q, 0); \
628 current->name = delta_q; \
631 #define leb128(name) do { \
633 CHECK(cbs_av1_read_leb128(ctx, rw, #name, &value)); \
634 current->name = value; \
637 #define infer(name, value) do { \
638 current->name = value; \
641 #define byte_alignment(rw) (get_bits_count(rw) % 8)
643 #include "cbs_av1_syntax_template.c"
657 #undef byte_alignment
661 #define READWRITE write
662 #define RWContext PutBitContext
664 #define xf(width, name, var, range_min, range_max, subs, ...) do { \
665 CHECK(ff_cbs_write_unsigned(ctx, rw, width, #name, \
666 SUBSCRIPTS(subs, __VA_ARGS__), \
667 var, range_min, range_max)); \
670 #define xsu(width, name, var, subs, ...) do { \
671 CHECK(ff_cbs_write_signed(ctx, rw, width, #name, \
672 SUBSCRIPTS(subs, __VA_ARGS__), var, \
673 MIN_INT_BITS(width), \
674 MAX_INT_BITS(width))); \
677 #define uvlc(name, range_min, range_max) do { \
678 CHECK(cbs_av1_write_uvlc(ctx, rw, #name, current->name, \
679 range_min, range_max)); \
682 #define ns(max_value, name, subs, ...) do { \
683 CHECK(cbs_av1_write_ns(ctx, rw, max_value, #name, \
684 SUBSCRIPTS(subs, __VA_ARGS__), \
688 #define increment(name, min, max) do { \
689 CHECK(cbs_av1_write_increment(ctx, rw, min, max, #name, \
693 #define subexp(name, max, subs, ...) do { \
694 CHECK(cbs_av1_write_subexp(ctx, rw, max, #name, \
695 SUBSCRIPTS(subs, __VA_ARGS__), \
699 #define delta_q(name) do { \
700 xf(1, name.delta_coded, current->name != 0, 0, 1, 0); \
702 xsu(1 + 6, name.delta_q, current->name, 0); \
705 #define leb128(name) do { \
706 CHECK(cbs_av1_write_leb128(ctx, rw, #name, current->name)); \
709 #define infer(name, value) do { \
710 if (current->name != (value)) { \
711 av_log(ctx->log_ctx, AV_LOG_WARNING, "Warning: " \
712 "%s does not match inferred value: " \
713 "%"PRId64", but should be %"PRId64".\n", \
714 #name, (int64_t)current->name, (int64_t)(value)); \
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 (get_bits_left(&gbc) < 8) {
772 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid OBU: fragment "
773 "too short (%"SIZE_SPECIFIER" bytes).\n", size);
774 err = AVERROR_INVALIDDATA;
778 if (header.obu_has_size_field) {
779 err = cbs_av1_read_leb128(ctx, &gbc, "obu_size", &obu_size);
783 obu_size = size - 1 - header.obu_extension_flag;
785 pos = get_bits_count(&gbc);
786 av_assert0(pos % 8 == 0 && pos / 8 <= size);
788 obu_length = pos / 8 + obu_size;
790 if (size < obu_length) {
791 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid OBU length: "
792 "%"PRIu64", but only %"SIZE_SPECIFIER" bytes remaining in fragment.\n",
794 err = AVERROR_INVALIDDATA;
798 err = ff_cbs_insert_unit_data(ctx, frag, -1, header.obu_type,
799 data, obu_length, frag->data_ref);
809 ctx->trace_enable = trace;
813 static void cbs_av1_free_tile_data(AV1RawTileData *td)
815 av_buffer_unref(&td->data_ref);
818 static void cbs_av1_free_padding(AV1RawPadding *pd)
820 av_buffer_unref(&pd->payload_ref);
823 static void cbs_av1_free_metadata(AV1RawMetadata *md)
825 switch (md->metadata_type) {
826 case AV1_METADATA_TYPE_ITUT_T35:
827 av_buffer_unref(&md->metadata.itut_t35.payload_ref);
832 static void cbs_av1_free_obu(void *opaque, uint8_t *content)
834 AV1RawOBU *obu = (AV1RawOBU*)content;
836 switch (obu->header.obu_type) {
837 case AV1_OBU_TILE_GROUP:
838 cbs_av1_free_tile_data(&obu->obu.tile_group.tile_data);
841 cbs_av1_free_tile_data(&obu->obu.frame.tile_group.tile_data);
843 case AV1_OBU_TILE_LIST:
844 cbs_av1_free_tile_data(&obu->obu.tile_list.tile_data);
846 case AV1_OBU_METADATA:
847 cbs_av1_free_metadata(&obu->obu.metadata);
849 case AV1_OBU_PADDING:
850 cbs_av1_free_padding(&obu->obu.padding);
857 static int cbs_av1_ref_tile_data(CodedBitstreamContext *ctx,
858 CodedBitstreamUnit *unit,
864 pos = get_bits_count(gbc);
865 if (pos >= 8 * unit->data_size) {
866 av_log(ctx->log_ctx, AV_LOG_ERROR, "Bitstream ended before "
867 "any data in tile group (%d bits read).\n", pos);
868 return AVERROR_INVALIDDATA;
870 // Must be byte-aligned at this point.
871 av_assert0(pos % 8 == 0);
873 td->data_ref = av_buffer_ref(unit->data_ref);
875 return AVERROR(ENOMEM);
877 td->data = unit->data + pos / 8;
878 td->data_size = unit->data_size - pos / 8;
883 static int cbs_av1_read_unit(CodedBitstreamContext *ctx,
884 CodedBitstreamUnit *unit)
886 CodedBitstreamAV1Context *priv = ctx->priv_data;
889 int err, start_pos, end_pos;
891 err = ff_cbs_alloc_unit_content(ctx, unit, sizeof(*obu),
897 err = init_get_bits(&gbc, unit->data, 8 * unit->data_size);
901 err = cbs_av1_read_obu_header(ctx, &gbc, &obu->header);
904 av_assert0(obu->header.obu_type == unit->type);
906 if (obu->header.obu_has_size_field) {
908 err = cbs_av1_read_leb128(ctx, &gbc, "obu_size", &obu_size);
911 obu->obu_size = obu_size;
913 if (unit->data_size < 1 + obu->header.obu_extension_flag) {
914 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid OBU length: "
915 "unit too short (%"SIZE_SPECIFIER").\n", unit->data_size);
916 return AVERROR_INVALIDDATA;
918 obu->obu_size = unit->data_size - 1 - obu->header.obu_extension_flag;
921 start_pos = get_bits_count(&gbc);
923 if (obu->header.obu_extension_flag) {
924 priv->temporal_id = obu->header.temporal_id;
925 priv->spatial_id = obu->header.spatial_id;
927 if (obu->header.obu_type != AV1_OBU_SEQUENCE_HEADER &&
928 obu->header.obu_type != AV1_OBU_TEMPORAL_DELIMITER &&
929 priv->operating_point_idc) {
930 int in_temporal_layer =
931 (priv->operating_point_idc >> priv->temporal_id ) & 1;
932 int in_spatial_layer =
933 (priv->operating_point_idc >> (priv->spatial_id + 8)) & 1;
934 if (!in_temporal_layer || !in_spatial_layer) {
935 // Decoding will drop this OBU at this operating point.
939 priv->temporal_id = 0;
940 priv->spatial_id = 0;
943 switch (obu->header.obu_type) {
944 case AV1_OBU_SEQUENCE_HEADER:
946 err = cbs_av1_read_sequence_header_obu(ctx, &gbc,
947 &obu->obu.sequence_header);
951 av_buffer_unref(&priv->sequence_header_ref);
952 priv->sequence_header = NULL;
954 priv->sequence_header_ref = av_buffer_ref(unit->content_ref);
955 if (!priv->sequence_header_ref)
956 return AVERROR(ENOMEM);
957 priv->sequence_header = &obu->obu.sequence_header;
960 case AV1_OBU_TEMPORAL_DELIMITER:
962 err = cbs_av1_read_temporal_delimiter_obu(ctx, &gbc);
967 case AV1_OBU_FRAME_HEADER:
968 case AV1_OBU_REDUNDANT_FRAME_HEADER:
970 err = cbs_av1_read_frame_header_obu(ctx, &gbc,
971 &obu->obu.frame_header,
972 obu->header.obu_type ==
973 AV1_OBU_REDUNDANT_FRAME_HEADER,
979 case AV1_OBU_TILE_GROUP:
981 err = cbs_av1_read_tile_group_obu(ctx, &gbc,
982 &obu->obu.tile_group);
986 err = cbs_av1_ref_tile_data(ctx, unit, &gbc,
987 &obu->obu.tile_group.tile_data);
994 err = cbs_av1_read_frame_obu(ctx, &gbc, &obu->obu.frame,
999 err = cbs_av1_ref_tile_data(ctx, unit, &gbc,
1000 &obu->obu.frame.tile_group.tile_data);
1005 case AV1_OBU_TILE_LIST:
1007 err = cbs_av1_read_tile_list_obu(ctx, &gbc,
1008 &obu->obu.tile_list);
1012 err = cbs_av1_ref_tile_data(ctx, unit, &gbc,
1013 &obu->obu.tile_list.tile_data);
1018 case AV1_OBU_METADATA:
1020 err = cbs_av1_read_metadata_obu(ctx, &gbc, &obu->obu.metadata);
1025 case AV1_OBU_PADDING:
1027 err = cbs_av1_read_padding_obu(ctx, &gbc, &obu->obu.padding);
1033 return AVERROR(ENOSYS);
1036 end_pos = get_bits_count(&gbc);
1037 av_assert0(end_pos <= unit->data_size * 8);
1039 if (obu->obu_size > 0 &&
1040 obu->header.obu_type != AV1_OBU_TILE_GROUP &&
1041 obu->header.obu_type != AV1_OBU_FRAME) {
1042 int nb_bits = obu->obu_size * 8 + start_pos - end_pos;
1045 return AVERROR_INVALIDDATA;
1047 err = cbs_av1_read_trailing_bits(ctx, &gbc, nb_bits);
1055 static int cbs_av1_write_obu(CodedBitstreamContext *ctx,
1056 CodedBitstreamUnit *unit,
1059 CodedBitstreamAV1Context *priv = ctx->priv_data;
1060 AV1RawOBU *obu = unit->content;
1061 PutBitContext pbc_tmp;
1064 int err, start_pos, end_pos, data_pos;
1066 // OBUs in the normal bitstream format must contain a size field
1067 // in every OBU (in annex B it is optional, but we don't support
1069 obu->header.obu_has_size_field = 1;
1071 err = cbs_av1_write_obu_header(ctx, pbc, &obu->header);
1075 if (obu->header.obu_has_size_field) {
1077 // Add space for the size field to fill later.
1083 start_pos = put_bits_count(pbc);
1085 switch (obu->header.obu_type) {
1086 case AV1_OBU_SEQUENCE_HEADER:
1088 err = cbs_av1_write_sequence_header_obu(ctx, pbc,
1089 &obu->obu.sequence_header);
1093 av_buffer_unref(&priv->sequence_header_ref);
1094 priv->sequence_header = NULL;
1096 priv->sequence_header_ref = av_buffer_ref(unit->content_ref);
1097 if (!priv->sequence_header_ref)
1098 return AVERROR(ENOMEM);
1099 priv->sequence_header = &obu->obu.sequence_header;
1102 case AV1_OBU_TEMPORAL_DELIMITER:
1104 err = cbs_av1_write_temporal_delimiter_obu(ctx, pbc);
1109 case AV1_OBU_FRAME_HEADER:
1110 case AV1_OBU_REDUNDANT_FRAME_HEADER:
1112 err = cbs_av1_write_frame_header_obu(ctx, pbc,
1113 &obu->obu.frame_header,
1114 obu->header.obu_type ==
1115 AV1_OBU_REDUNDANT_FRAME_HEADER,
1121 case AV1_OBU_TILE_GROUP:
1123 err = cbs_av1_write_tile_group_obu(ctx, pbc,
1124 &obu->obu.tile_group);
1128 td = &obu->obu.tile_group.tile_data;
1133 err = cbs_av1_write_frame_obu(ctx, pbc, &obu->obu.frame, NULL);
1137 td = &obu->obu.frame.tile_group.tile_data;
1140 case AV1_OBU_TILE_LIST:
1142 err = cbs_av1_write_tile_list_obu(ctx, pbc, &obu->obu.tile_list);
1146 td = &obu->obu.tile_list.tile_data;
1149 case AV1_OBU_METADATA:
1151 err = cbs_av1_write_metadata_obu(ctx, pbc, &obu->obu.metadata);
1156 case AV1_OBU_PADDING:
1158 err = cbs_av1_write_padding_obu(ctx, pbc, &obu->obu.padding);
1164 return AVERROR(ENOSYS);
1167 end_pos = put_bits_count(pbc);
1168 header_size = (end_pos - start_pos + 7) / 8;
1170 obu->obu_size = header_size + td->data_size;
1171 } else if (header_size > 0) {
1172 // Add trailing bits and recalculate.
1173 err = cbs_av1_write_trailing_bits(ctx, pbc, 8 - end_pos % 8);
1176 end_pos = put_bits_count(pbc);
1177 obu->obu_size = header_size = (end_pos - start_pos + 7) / 8;
1183 end_pos = put_bits_count(pbc);
1184 // Must now be byte-aligned.
1185 av_assert0(end_pos % 8 == 0);
1186 flush_put_bits(pbc);
1191 err = cbs_av1_write_leb128(ctx, pbc, "obu_size", obu->obu_size);
1195 data_pos = put_bits_count(pbc) / 8;
1196 flush_put_bits(pbc);
1197 av_assert0(data_pos <= start_pos);
1199 if (8 * obu->obu_size > put_bits_left(pbc))
1200 return AVERROR(ENOSPC);
1202 if (obu->obu_size > 0) {
1203 memmove(priv->write_buffer + data_pos,
1204 priv->write_buffer + start_pos, header_size);
1205 skip_put_bytes(pbc, header_size);
1208 memcpy(priv->write_buffer + data_pos + header_size,
1209 td->data, td->data_size);
1210 skip_put_bytes(pbc, td->data_size);
1217 static int cbs_av1_write_unit(CodedBitstreamContext *ctx,
1218 CodedBitstreamUnit *unit)
1220 CodedBitstreamAV1Context *priv = ctx->priv_data;
1224 if (!priv->write_buffer) {
1225 // Initial write buffer size is 1MB.
1226 priv->write_buffer_size = 1024 * 1024;
1228 reallocate_and_try_again:
1229 err = av_reallocp(&priv->write_buffer, priv->write_buffer_size);
1231 av_log(ctx->log_ctx, AV_LOG_ERROR, "Unable to allocate a "
1232 "sufficiently large write buffer (last attempt "
1233 "%"SIZE_SPECIFIER" bytes).\n", priv->write_buffer_size);
1238 init_put_bits(&pbc, priv->write_buffer, priv->write_buffer_size);
1240 err = cbs_av1_write_obu(ctx, unit, &pbc);
1241 if (err == AVERROR(ENOSPC)) {
1243 priv->write_buffer_size *= 2;
1244 goto reallocate_and_try_again;
1249 // Overflow but we didn't notice.
1250 av_assert0(put_bits_count(&pbc) <= 8 * priv->write_buffer_size);
1252 // OBU data must be byte-aligned.
1253 av_assert0(put_bits_count(&pbc) % 8 == 0);
1255 unit->data_size = put_bits_count(&pbc) / 8;
1256 flush_put_bits(&pbc);
1258 err = ff_cbs_alloc_unit_data(ctx, unit, unit->data_size);
1262 memcpy(unit->data, priv->write_buffer, unit->data_size);
1267 static int cbs_av1_assemble_fragment(CodedBitstreamContext *ctx,
1268 CodedBitstreamFragment *frag)
1274 for (i = 0; i < frag->nb_units; i++)
1275 size += frag->units[i].data_size;
1277 frag->data_ref = av_buffer_alloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
1278 if (!frag->data_ref)
1279 return AVERROR(ENOMEM);
1280 frag->data = frag->data_ref->data;
1281 memset(frag->data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
1284 for (i = 0; i < frag->nb_units; i++) {
1285 memcpy(frag->data + pos, frag->units[i].data,
1286 frag->units[i].data_size);
1287 pos += frag->units[i].data_size;
1289 av_assert0(pos == size);
1290 frag->data_size = size;
1295 static void cbs_av1_close(CodedBitstreamContext *ctx)
1297 CodedBitstreamAV1Context *priv = ctx->priv_data;
1299 av_buffer_unref(&priv->sequence_header_ref);
1300 av_buffer_unref(&priv->frame_header_ref);
1302 av_freep(&priv->write_buffer);
1305 const CodedBitstreamType ff_cbs_type_av1 = {
1306 .codec_id = AV_CODEC_ID_AV1,
1308 .priv_data_size = sizeof(CodedBitstreamAV1Context),
1310 .split_fragment = &cbs_av1_split_fragment,
1311 .read_unit = &cbs_av1_read_unit,
1312 .write_unit = &cbs_av1_write_unit,
1313 .assemble_fragment = &cbs_av1_assemble_fragment,
1315 .close = &cbs_av1_close,