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)
33 int position, zeroes, i, j;
36 if (ctx->trace_enable)
37 position = get_bits_count(gbc);
41 if (get_bits_left(gbc) < zeroes + 1) {
42 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid uvlc code at "
43 "%s: bitstream ended.\n", name);
44 return AVERROR_INVALIDDATA;
57 value = MAX_UINT_BITS(32);
59 value = get_bits_long(gbc, zeroes);
61 for (j = 0; j < zeroes; j++)
62 bits[i++] = (value >> (zeroes - j - 1) & 1) ? '1' : '0';
64 value += (1 << zeroes) - 1;
67 if (ctx->trace_enable) {
69 ff_cbs_trace_syntax_element(ctx, position, name, NULL,
73 if (value < range_min || value > range_max) {
74 av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
75 "%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
76 name, value, range_min, range_max);
77 return AVERROR_INVALIDDATA;
84 static int cbs_av1_write_uvlc(CodedBitstreamContext *ctx, PutBitContext *pbc,
85 const char *name, uint32_t value,
86 uint32_t range_min, uint32_t range_max)
91 if (value < range_min || value > range_max) {
92 av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
93 "%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
94 name, value, range_min, range_max);
95 return AVERROR_INVALIDDATA;
98 if (ctx->trace_enable)
99 position = put_bits_count(pbc);
105 zeroes = av_log2(value + 1);
106 v = value - (1 << zeroes) + 1;
107 put_bits(pbc, zeroes + 1, 1);
108 put_bits(pbc, zeroes, v);
111 if (ctx->trace_enable) {
115 for (j = 0; j < zeroes; j++)
118 for (j = 0; j < zeroes; j++)
119 bits[i++] = (v >> (zeroes - j - 1) & 1) ? '1' : '0';
121 ff_cbs_trace_syntax_element(ctx, position, name, NULL,
128 static int cbs_av1_read_leb128(CodedBitstreamContext *ctx, GetBitContext *gbc,
129 const char *name, uint64_t *write_to)
132 int position, err, i;
134 if (ctx->trace_enable)
135 position = get_bits_count(gbc);
138 for (i = 0; i < 8; i++) {
139 int subscript[2] = { 1, i };
141 err = ff_cbs_read_unsigned(ctx, gbc, 8, "leb128_byte[i]", subscript,
146 value |= (uint64_t)(byte & 0x7f) << (i * 7);
151 if (ctx->trace_enable)
152 ff_cbs_trace_syntax_element(ctx, position, name, NULL, "", value);
158 static int cbs_av1_write_leb128(CodedBitstreamContext *ctx, PutBitContext *pbc,
159 const char *name, uint64_t value)
161 int position, err, len, i;
164 len = (av_log2(value) + 7) / 7;
166 if (ctx->trace_enable)
167 position = put_bits_count(pbc);
169 for (i = 0; i < len; i++) {
170 int subscript[2] = { 1, i };
172 byte = value >> (7 * i) & 0x7f;
176 err = ff_cbs_write_unsigned(ctx, pbc, 8, "leb128_byte[i]", subscript,
182 if (ctx->trace_enable)
183 ff_cbs_trace_syntax_element(ctx, position, name, NULL, "", value);
188 static int cbs_av1_read_su(CodedBitstreamContext *ctx, GetBitContext *gbc,
189 int width, const char *name,
190 const int *subscripts, int32_t *write_to)
195 if (ctx->trace_enable)
196 position = get_bits_count(gbc);
198 if (get_bits_left(gbc) < width) {
199 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid signed value at "
200 "%s: bitstream ended.\n", name);
201 return AVERROR_INVALIDDATA;
204 value = get_sbits(gbc, width);
206 if (ctx->trace_enable) {
209 for (i = 0; i < width; i++)
210 bits[i] = value & (1 << (width - i - 1)) ? '1' : '0';
213 ff_cbs_trace_syntax_element(ctx, position,
214 name, subscripts, bits, value);
221 static int cbs_av1_write_su(CodedBitstreamContext *ctx, PutBitContext *pbc,
222 int width, const char *name,
223 const int *subscripts, int32_t value)
225 if (put_bits_left(pbc) < width)
226 return AVERROR(ENOSPC);
228 if (ctx->trace_enable) {
231 for (i = 0; i < width; i++)
232 bits[i] = value & (1 << (width - i - 1)) ? '1' : '0';
235 ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc),
236 name, subscripts, bits, value);
239 put_sbits(pbc, width, value);
244 static int cbs_av1_read_ns(CodedBitstreamContext *ctx, GetBitContext *gbc,
245 uint32_t n, const char *name,
246 const int *subscripts, uint32_t *write_to)
248 uint32_t w, m, v, extra_bit, value;
253 if (ctx->trace_enable)
254 position = get_bits_count(gbc);
259 if (get_bits_left(gbc) < w) {
260 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid non-symmetric value at "
261 "%s: bitstream ended.\n", name);
262 return AVERROR_INVALIDDATA;
266 v = get_bits(gbc, w - 1);
273 extra_bit = get_bits1(gbc);
274 value = (v << 1) - m + extra_bit;
277 if (ctx->trace_enable) {
280 for (i = 0; i < w - 1; i++)
281 bits[i] = (v >> i & 1) ? '1' : '0';
283 bits[i++] = extra_bit ? '1' : '0';
286 ff_cbs_trace_syntax_element(ctx, position,
287 name, subscripts, bits, value);
294 static int cbs_av1_write_ns(CodedBitstreamContext *ctx, PutBitContext *pbc,
295 uint32_t n, const char *name,
296 const int *subscripts, uint32_t value)
298 uint32_t w, m, v, extra_bit;
302 av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
303 "%"PRIu32", but must be in [0,%"PRIu32"].\n",
305 return AVERROR_INVALIDDATA;
308 if (ctx->trace_enable)
309 position = put_bits_count(pbc);
314 if (put_bits_left(pbc) < w)
315 return AVERROR(ENOSPC);
319 put_bits(pbc, w - 1, v);
321 v = m + ((value - m) >> 1);
322 extra_bit = (value - m) & 1;
323 put_bits(pbc, w - 1, v);
324 put_bits(pbc, 1, extra_bit);
327 if (ctx->trace_enable) {
330 for (i = 0; i < w - 1; i++)
331 bits[i] = (v >> i & 1) ? '1' : '0';
333 bits[i++] = extra_bit ? '1' : '0';
336 ff_cbs_trace_syntax_element(ctx, position,
337 name, subscripts, bits, value);
343 static int cbs_av1_read_increment(CodedBitstreamContext *ctx, GetBitContext *gbc,
344 uint32_t range_min, uint32_t range_max,
345 const char *name, uint32_t *write_to)
351 av_assert0(range_min <= range_max && range_max - range_min < sizeof(bits) - 1);
352 if (ctx->trace_enable)
353 position = get_bits_count(gbc);
355 for (i = 0, value = range_min; value < range_max;) {
356 if (get_bits_left(gbc) < 1) {
357 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid increment value at "
358 "%s: bitstream ended.\n", name);
359 return AVERROR_INVALIDDATA;
361 if (get_bits1(gbc)) {
370 if (ctx->trace_enable) {
372 ff_cbs_trace_syntax_element(ctx, position,
373 name, NULL, bits, value);
380 static int cbs_av1_write_increment(CodedBitstreamContext *ctx, PutBitContext *pbc,
381 uint32_t range_min, uint32_t range_max,
382 const char *name, uint32_t value)
386 av_assert0(range_min <= range_max && range_max - range_min < 32);
387 if (value < range_min || value > range_max) {
388 av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
389 "%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
390 name, value, range_min, range_max);
391 return AVERROR_INVALIDDATA;
394 if (value == range_max)
395 len = range_max - range_min;
397 len = value - range_min + 1;
398 if (put_bits_left(pbc) < len)
399 return AVERROR(ENOSPC);
401 if (ctx->trace_enable) {
404 for (i = 0; i < len; i++) {
405 if (range_min + i == value)
411 ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc),
412 name, NULL, bits, value);
416 put_bits(pbc, len, (1 << len) - 1 - (value != range_max));
421 static int cbs_av1_read_subexp(CodedBitstreamContext *ctx, GetBitContext *gbc,
422 uint32_t range_max, const char *name,
423 const int *subscripts, uint32_t *write_to)
427 uint32_t max_len, len, range_offset, range_bits;
429 if (ctx->trace_enable)
430 position = get_bits_count(gbc);
432 av_assert0(range_max > 0);
433 max_len = av_log2(range_max - 1) - 3;
435 err = cbs_av1_read_increment(ctx, gbc, 0, max_len,
436 "subexp_more_bits", &len);
441 range_bits = 2 + len;
442 range_offset = 1 << range_bits;
449 err = ff_cbs_read_unsigned(ctx, gbc, range_bits,
450 "subexp_bits", NULL, &value,
451 0, MAX_UINT_BITS(range_bits));
456 err = cbs_av1_read_ns(ctx, gbc, range_max - range_offset,
457 "subexp_final_bits", NULL, &value);
461 value += range_offset;
463 if (ctx->trace_enable)
464 ff_cbs_trace_syntax_element(ctx, position,
465 name, subscripts, "", value);
471 static int cbs_av1_write_subexp(CodedBitstreamContext *ctx, PutBitContext *pbc,
472 uint32_t range_max, const char *name,
473 const int *subscripts, uint32_t value)
476 uint32_t max_len, len, range_offset, range_bits;
478 if (value > range_max) {
479 av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
480 "%"PRIu32", but must be in [0,%"PRIu32"].\n",
481 name, value, range_max);
482 return AVERROR_INVALIDDATA;
485 if (ctx->trace_enable)
486 position = put_bits_count(pbc);
488 av_assert0(range_max > 0);
489 max_len = av_log2(range_max - 1) - 3;
496 range_bits = av_log2(value);
497 len = range_bits - 2;
499 // The top bin is combined with the one below it.
500 av_assert0(len == max_len + 1);
504 range_offset = 1 << range_bits;
507 err = cbs_av1_write_increment(ctx, pbc, 0, max_len,
508 "subexp_more_bits", len);
513 err = ff_cbs_write_unsigned(ctx, pbc, range_bits,
515 value - range_offset,
516 0, MAX_UINT_BITS(range_bits));
521 err = cbs_av1_write_ns(ctx, pbc, range_max - range_offset,
522 "subexp_final_bits", NULL,
523 value - range_offset);
528 if (ctx->trace_enable)
529 ff_cbs_trace_syntax_element(ctx, position,
530 name, subscripts, "", value);
536 static int cbs_av1_tile_log2(int blksize, int target)
539 for (k = 0; (blksize << k) < target; k++);
543 static int cbs_av1_get_relative_dist(const AV1RawSequenceHeader *seq,
544 unsigned int a, unsigned int b)
546 unsigned int diff, m;
547 if (!seq->enable_order_hint)
550 m = 1 << seq->order_hint_bits_minus_1;
551 diff = (diff & (m - 1)) - (diff & m);
556 #define HEADER(name) do { \
557 ff_cbs_trace_header(ctx, name); \
560 #define CHECK(call) do { \
566 #define FUNC_NAME(rw, codec, name) cbs_ ## codec ## _ ## rw ## _ ## name
567 #define FUNC_AV1(rw, name) FUNC_NAME(rw, av1, name)
568 #define FUNC(name) FUNC_AV1(READWRITE, name)
570 #define SUBSCRIPTS(subs, ...) (subs > 0 ? ((int[subs + 1]){ subs, __VA_ARGS__ }) : NULL)
572 #define fb(width, name) \
573 xf(width, name, current->name, 0, MAX_UINT_BITS(width), 0)
574 #define fc(width, name, range_min, range_max) \
575 xf(width, name, current->name, range_min, range_max, 0)
576 #define flag(name) fb(1, name)
577 #define su(width, name) \
578 xsu(width, name, current->name, 0)
580 #define fbs(width, name, subs, ...) \
581 xf(width, name, current->name, 0, MAX_UINT_BITS(width), subs, __VA_ARGS__)
582 #define fcs(width, name, range_min, range_max, subs, ...) \
583 xf(width, name, current->name, range_min, range_max, subs, __VA_ARGS__)
584 #define flags(name, subs, ...) \
585 xf(1, name, current->name, 0, 1, subs, __VA_ARGS__)
586 #define sus(width, name, subs, ...) \
587 xsu(width, name, current->name, subs, __VA_ARGS__)
589 #define fixed(width, name, value) do { \
590 av_unused uint32_t fixed_value = value; \
591 xf(width, name, fixed_value, value, value, 0); \
596 #define READWRITE read
597 #define RWContext GetBitContext
599 #define xf(width, name, var, range_min, range_max, subs, ...) do { \
600 uint32_t value = range_min; \
601 CHECK(ff_cbs_read_unsigned(ctx, rw, width, #name, \
602 SUBSCRIPTS(subs, __VA_ARGS__), \
603 &value, range_min, range_max)); \
607 #define xsu(width, name, var, subs, ...) do { \
609 CHECK(cbs_av1_read_su(ctx, rw, width, #name, \
610 SUBSCRIPTS(subs, __VA_ARGS__), &value)); \
614 #define uvlc(name, range_min, range_max) do { \
615 uint32_t value = range_min; \
616 CHECK(cbs_av1_read_uvlc(ctx, rw, #name, \
617 &value, range_min, range_max)); \
618 current->name = value; \
621 #define ns(max_value, name, subs, ...) do { \
622 uint32_t value = 0; \
623 CHECK(cbs_av1_read_ns(ctx, rw, max_value, #name, \
624 SUBSCRIPTS(subs, __VA_ARGS__), &value)); \
625 current->name = value; \
628 #define increment(name, min, max) do { \
629 uint32_t value = 0; \
630 CHECK(cbs_av1_read_increment(ctx, rw, min, max, #name, &value)); \
631 current->name = value; \
634 #define subexp(name, max, subs, ...) do { \
635 uint32_t value = 0; \
636 CHECK(cbs_av1_read_subexp(ctx, rw, max, #name, \
637 SUBSCRIPTS(subs, __VA_ARGS__), &value)); \
638 current->name = value; \
641 #define delta_q(name) do { \
642 uint8_t delta_coded; \
644 xf(1, name.delta_coded, delta_coded, 0, 1, 0); \
646 xsu(1 + 6, name.delta_q, delta_q, 0); \
649 current->name = delta_q; \
652 #define leb128(name) do { \
653 uint64_t value = 0; \
654 CHECK(cbs_av1_read_leb128(ctx, rw, #name, &value)); \
655 current->name = value; \
658 #define infer(name, value) do { \
659 current->name = value; \
662 #define byte_alignment(rw) (get_bits_count(rw) % 8)
664 #include "cbs_av1_syntax_template.c"
679 #undef byte_alignment
683 #define READWRITE write
684 #define RWContext PutBitContext
686 #define xf(width, name, var, range_min, range_max, subs, ...) do { \
687 CHECK(ff_cbs_write_unsigned(ctx, rw, width, #name, \
688 SUBSCRIPTS(subs, __VA_ARGS__), \
689 var, range_min, range_max)); \
692 #define xsu(width, name, var, subs, ...) do { \
693 CHECK(cbs_av1_write_su(ctx, rw, width, #name, \
694 SUBSCRIPTS(subs, __VA_ARGS__), var)); \
697 #define uvlc(name, range_min, range_max) do { \
698 CHECK(cbs_av1_write_uvlc(ctx, rw, #name, current->name, \
699 range_min, range_max)); \
702 #define ns(max_value, name, subs, ...) do { \
703 CHECK(cbs_av1_write_ns(ctx, rw, max_value, #name, \
704 SUBSCRIPTS(subs, __VA_ARGS__), \
708 #define increment(name, min, max) do { \
709 CHECK(cbs_av1_write_increment(ctx, rw, min, max, #name, \
713 #define subexp(name, max, subs, ...) do { \
714 CHECK(cbs_av1_write_subexp(ctx, rw, max, #name, \
715 SUBSCRIPTS(subs, __VA_ARGS__), \
719 #define delta_q(name) do { \
720 xf(1, name.delta_coded, current->name != 0, 0, 1, 0); \
722 xsu(1 + 6, name.delta_q, current->name, 0); \
725 #define leb128(name) do { \
726 CHECK(cbs_av1_write_leb128(ctx, rw, #name, current->name)); \
729 #define infer(name, value) do { \
730 if (current->name != (value)) { \
731 av_log(ctx->log_ctx, AV_LOG_WARNING, "Warning: " \
732 "%s does not match inferred value: " \
733 "%"PRId64", but should be %"PRId64".\n", \
734 #name, (int64_t)current->name, (int64_t)(value)); \
738 #define byte_alignment(rw) (put_bits_count(rw) % 8)
740 #include "cbs_av1_syntax_template.c"
754 #undef byte_alignment
757 static int cbs_av1_split_fragment(CodedBitstreamContext *ctx,
758 CodedBitstreamFragment *frag,
767 // Don't include this parsing in trace output.
768 trace = ctx->trace_enable;
769 ctx->trace_enable = 0;
772 size = frag->data_size;
774 if (INT_MAX / 8 < size) {
775 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid fragment: "
776 "too large (%zu bytes).\n", size);
777 err = AVERROR_INVALIDDATA;
782 AV1RawOBUHeader header;
785 init_get_bits(&gbc, data, 8 * size);
787 err = cbs_av1_read_obu_header(ctx, &gbc, &header);
791 if (get_bits_left(&gbc) < 8) {
792 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid OBU: fragment "
793 "too short (%zu bytes).\n", size);
794 err = AVERROR_INVALIDDATA;
798 if (header.obu_has_size_field) {
799 err = cbs_av1_read_leb128(ctx, &gbc, "obu_size", &obu_size);
803 obu_size = size - 1 - header.obu_extension_flag;
805 pos = get_bits_count(&gbc);
806 av_assert0(pos % 8 == 0 && pos / 8 <= size);
808 obu_length = pos / 8 + obu_size;
810 if (size < obu_length) {
811 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid OBU length: "
812 "%"PRIu64", but only %zu bytes remaining in fragment.\n",
814 err = AVERROR_INVALIDDATA;
818 err = ff_cbs_insert_unit_data(ctx, frag, -1, header.obu_type,
819 data, obu_length, frag->data_ref);
829 ctx->trace_enable = trace;
833 static void cbs_av1_free_tile_data(AV1RawTileData *td)
835 av_buffer_unref(&td->data_ref);
838 static void cbs_av1_free_metadata(AV1RawMetadata *md)
840 switch (md->metadata_type) {
841 case AV1_METADATA_TYPE_ITUT_T35:
842 av_buffer_unref(&md->metadata.itut_t35.payload_ref);
847 static void cbs_av1_free_obu(void *unit, uint8_t *content)
849 AV1RawOBU *obu = (AV1RawOBU*)content;
851 switch (obu->header.obu_type) {
852 case AV1_OBU_TILE_GROUP:
853 cbs_av1_free_tile_data(&obu->obu.tile_group.tile_data);
856 cbs_av1_free_tile_data(&obu->obu.frame.tile_group.tile_data);
858 case AV1_OBU_TILE_LIST:
859 cbs_av1_free_tile_data(&obu->obu.tile_list.tile_data);
861 case AV1_OBU_METADATA:
862 cbs_av1_free_metadata(&obu->obu.metadata);
869 static int cbs_av1_ref_tile_data(CodedBitstreamContext *ctx,
870 CodedBitstreamUnit *unit,
876 pos = get_bits_count(gbc);
877 if (pos >= 8 * unit->data_size) {
878 av_log(ctx->log_ctx, AV_LOG_ERROR, "Bitstream ended before "
879 "any data in tile group (%d bits read).\n", pos);
880 return AVERROR_INVALIDDATA;
882 // Must be byte-aligned at this point.
883 av_assert0(pos % 8 == 0);
885 td->data_ref = av_buffer_ref(unit->data_ref);
887 return AVERROR(ENOMEM);
889 td->data = unit->data + pos / 8;
890 td->data_size = unit->data_size - pos / 8;
895 static int cbs_av1_read_unit(CodedBitstreamContext *ctx,
896 CodedBitstreamUnit *unit)
898 CodedBitstreamAV1Context *priv = ctx->priv_data;
901 int err, start_pos, end_pos;
903 err = ff_cbs_alloc_unit_content(ctx, unit, sizeof(*obu),
909 err = init_get_bits(&gbc, unit->data, 8 * unit->data_size);
913 err = cbs_av1_read_obu_header(ctx, &gbc, &obu->header);
916 av_assert0(obu->header.obu_type == unit->type);
918 if (obu->header.obu_has_size_field) {
920 err = cbs_av1_read_leb128(ctx, &gbc, "obu_size", &obu_size);
923 obu->obu_size = obu_size;
925 if (unit->data_size < 1 + obu->header.obu_extension_flag) {
926 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid OBU length: "
927 "unit too short (%zu).\n", unit->data_size);
928 return AVERROR_INVALIDDATA;
930 obu->obu_size = unit->data_size - 1 - obu->header.obu_extension_flag;
933 start_pos = get_bits_count(&gbc);
935 if (obu->header.obu_extension_flag) {
936 priv->temporal_id = obu->header.temporal_id;
937 priv->spatial_id = obu->header.temporal_id;
939 if (obu->header.obu_type != AV1_OBU_SEQUENCE_HEADER &&
940 obu->header.obu_type != AV1_OBU_TEMPORAL_DELIMITER &&
941 priv->operating_point_idc) {
942 int in_temporal_layer =
943 (priv->operating_point_idc >> priv->temporal_id ) & 1;
944 int in_spatial_layer =
945 (priv->operating_point_idc >> (priv->spatial_id + 8)) & 1;
946 if (!in_temporal_layer || !in_spatial_layer) {
947 // Decoding will drop this OBU at this operating point.
951 priv->temporal_id = 0;
952 priv->spatial_id = 0;
955 switch (obu->header.obu_type) {
956 case AV1_OBU_SEQUENCE_HEADER:
958 err = cbs_av1_read_sequence_header_obu(ctx, &gbc,
959 &obu->obu.sequence_header);
963 av_buffer_unref(&priv->sequence_header_ref);
964 priv->sequence_header = NULL;
966 priv->sequence_header_ref = av_buffer_ref(unit->content_ref);
967 if (!priv->sequence_header_ref)
968 return AVERROR(ENOMEM);
969 priv->sequence_header = &obu->obu.sequence_header;
972 case AV1_OBU_TEMPORAL_DELIMITER:
974 err = cbs_av1_read_temporal_delimiter_obu(ctx, &gbc);
979 case AV1_OBU_FRAME_HEADER:
980 case AV1_OBU_REDUNDANT_FRAME_HEADER:
982 err = cbs_av1_read_frame_header_obu(ctx, &gbc,
983 &obu->obu.frame_header,
984 obu->header.obu_type ==
985 AV1_OBU_REDUNDANT_FRAME_HEADER,
991 case AV1_OBU_TILE_GROUP:
993 err = cbs_av1_read_tile_group_obu(ctx, &gbc,
994 &obu->obu.tile_group);
998 err = cbs_av1_ref_tile_data(ctx, unit, &gbc,
999 &obu->obu.tile_group.tile_data);
1006 err = cbs_av1_read_frame_obu(ctx, &gbc, &obu->obu.frame,
1011 err = cbs_av1_ref_tile_data(ctx, unit, &gbc,
1012 &obu->obu.frame.tile_group.tile_data);
1017 case AV1_OBU_TILE_LIST:
1019 err = cbs_av1_read_tile_list_obu(ctx, &gbc,
1020 &obu->obu.tile_list);
1024 err = cbs_av1_ref_tile_data(ctx, unit, &gbc,
1025 &obu->obu.tile_list.tile_data);
1030 case AV1_OBU_METADATA:
1032 err = cbs_av1_read_metadata_obu(ctx, &gbc, &obu->obu.metadata);
1037 case AV1_OBU_PADDING:
1039 return AVERROR(ENOSYS);
1042 end_pos = get_bits_count(&gbc);
1043 av_assert0(end_pos <= unit->data_size * 8);
1045 if (obu->obu_size > 0 &&
1046 obu->header.obu_type != AV1_OBU_TILE_GROUP &&
1047 obu->header.obu_type != AV1_OBU_FRAME) {
1048 err = cbs_av1_read_trailing_bits(ctx, &gbc,
1049 obu->obu_size * 8 + start_pos - end_pos);
1057 static int cbs_av1_write_obu(CodedBitstreamContext *ctx,
1058 CodedBitstreamUnit *unit,
1061 CodedBitstreamAV1Context *priv = ctx->priv_data;
1062 AV1RawOBU *obu = unit->content;
1063 PutBitContext pbc_tmp;
1066 int err, start_pos, end_pos, data_pos;
1068 // OBUs in the normal bitstream format must contain a size field
1069 // in every OBU (in annex B it is optional, but we don't support
1071 obu->header.obu_has_size_field = 1;
1073 err = cbs_av1_write_obu_header(ctx, pbc, &obu->header);
1077 if (obu->header.obu_has_size_field) {
1079 // Add space for the size field to fill later.
1085 start_pos = put_bits_count(pbc);
1087 switch (obu->header.obu_type) {
1088 case AV1_OBU_SEQUENCE_HEADER:
1090 err = cbs_av1_write_sequence_header_obu(ctx, pbc,
1091 &obu->obu.sequence_header);
1095 av_buffer_unref(&priv->sequence_header_ref);
1096 priv->sequence_header = NULL;
1098 priv->sequence_header_ref = av_buffer_ref(unit->content_ref);
1099 if (!priv->sequence_header_ref)
1100 return AVERROR(ENOMEM);
1101 priv->sequence_header = &obu->obu.sequence_header;
1104 case AV1_OBU_TEMPORAL_DELIMITER:
1106 err = cbs_av1_write_temporal_delimiter_obu(ctx, pbc);
1111 case AV1_OBU_FRAME_HEADER:
1112 case AV1_OBU_REDUNDANT_FRAME_HEADER:
1114 err = cbs_av1_write_frame_header_obu(ctx, pbc,
1115 &obu->obu.frame_header,
1116 obu->header.obu_type ==
1117 AV1_OBU_REDUNDANT_FRAME_HEADER,
1123 case AV1_OBU_TILE_GROUP:
1125 err = cbs_av1_write_tile_group_obu(ctx, pbc,
1126 &obu->obu.tile_group);
1130 td = &obu->obu.tile_group.tile_data;
1135 err = cbs_av1_write_frame_obu(ctx, pbc, &obu->obu.frame, NULL);
1139 td = &obu->obu.frame.tile_group.tile_data;
1142 case AV1_OBU_TILE_LIST:
1144 err = cbs_av1_write_tile_list_obu(ctx, pbc, &obu->obu.tile_list);
1148 td = &obu->obu.tile_list.tile_data;
1151 case AV1_OBU_METADATA:
1153 err = cbs_av1_write_metadata_obu(ctx, pbc, &obu->obu.metadata);
1158 case AV1_OBU_PADDING:
1160 return AVERROR(ENOSYS);
1163 end_pos = put_bits_count(pbc);
1164 header_size = (end_pos - start_pos + 7) / 8;
1166 obu->obu_size = header_size + td->data_size;
1167 } else if (header_size > 0) {
1168 // Add trailing bits and recalculate.
1169 err = cbs_av1_write_trailing_bits(ctx, pbc, 8 - end_pos % 8);
1172 end_pos = put_bits_count(pbc);
1173 obu->obu_size = header_size = (end_pos - start_pos + 7) / 8;
1179 end_pos = put_bits_count(pbc);
1180 // Must now be byte-aligned.
1181 av_assert0(end_pos % 8 == 0);
1182 flush_put_bits(pbc);
1187 err = cbs_av1_write_leb128(ctx, pbc, "obu_size", obu->obu_size);
1191 data_pos = put_bits_count(pbc) / 8;
1192 flush_put_bits(pbc);
1193 av_assert0(data_pos <= start_pos);
1195 if (8 * obu->obu_size > put_bits_left(pbc))
1196 return AVERROR(ENOSPC);
1198 if (obu->obu_size > 0) {
1199 memmove(priv->write_buffer + data_pos,
1200 priv->write_buffer + start_pos, header_size);
1201 skip_put_bytes(pbc, header_size);
1204 memcpy(priv->write_buffer + data_pos + header_size,
1205 td->data, td->data_size);
1206 skip_put_bytes(pbc, td->data_size);
1213 static int cbs_av1_write_unit(CodedBitstreamContext *ctx,
1214 CodedBitstreamUnit *unit)
1216 CodedBitstreamAV1Context *priv = ctx->priv_data;
1220 if (!priv->write_buffer) {
1221 // Initial write buffer size is 1MB.
1222 priv->write_buffer_size = 1024 * 1024;
1224 reallocate_and_try_again:
1225 err = av_reallocp(&priv->write_buffer, priv->write_buffer_size);
1227 av_log(ctx->log_ctx, AV_LOG_ERROR, "Unable to allocate a "
1228 "sufficiently large write buffer (last attempt "
1229 "%zu bytes).\n", priv->write_buffer_size);
1234 init_put_bits(&pbc, priv->write_buffer, priv->write_buffer_size);
1236 err = cbs_av1_write_obu(ctx, unit, &pbc);
1237 if (err == AVERROR(ENOSPC)) {
1239 priv->write_buffer_size *= 2;
1240 goto reallocate_and_try_again;
1245 // Overflow but we didn't notice.
1246 av_assert0(put_bits_count(&pbc) <= 8 * priv->write_buffer_size);
1248 // OBU data must be byte-aligned.
1249 av_assert0(put_bits_count(&pbc) % 8 == 0);
1251 unit->data_size = put_bits_count(&pbc) / 8;
1252 flush_put_bits(&pbc);
1254 err = ff_cbs_alloc_unit_data(ctx, unit, unit->data_size);
1258 memcpy(unit->data, priv->write_buffer, unit->data_size);
1263 static int cbs_av1_assemble_fragment(CodedBitstreamContext *ctx,
1264 CodedBitstreamFragment *frag)
1270 for (i = 0; i < frag->nb_units; i++)
1271 size += frag->units[i].data_size;
1273 frag->data_ref = av_buffer_alloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
1274 if (!frag->data_ref)
1275 return AVERROR(ENOMEM);
1276 frag->data = frag->data_ref->data;
1277 memset(frag->data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
1280 for (i = 0; i < frag->nb_units; i++) {
1281 memcpy(frag->data + pos, frag->units[i].data,
1282 frag->units[i].data_size);
1283 pos += frag->units[i].data_size;
1285 av_assert0(pos == size);
1286 frag->data_size = size;
1291 static void cbs_av1_close(CodedBitstreamContext *ctx)
1293 CodedBitstreamAV1Context *priv = ctx->priv_data;
1295 av_buffer_unref(&priv->sequence_header_ref);
1296 av_buffer_unref(&priv->frame_header_ref);
1298 av_freep(&priv->write_buffer);
1301 const CodedBitstreamType ff_cbs_type_av1 = {
1302 .codec_id = AV_CODEC_ID_AV1,
1304 .priv_data_size = sizeof(CodedBitstreamAV1Context),
1306 .split_fragment = &cbs_av1_split_fragment,
1307 .read_unit = &cbs_av1_read_unit,
1308 .write_unit = &cbs_av1_write_unit,
1309 .assemble_fragment = &cbs_av1_assemble_fragment,
1311 .close = &cbs_av1_close,