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)
196 if (ctx->trace_enable)
197 position = get_bits_count(gbc);
199 if (get_bits_left(gbc) < width + 1) {
200 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid signed value at "
201 "%s: bitstream ended.\n", name);
202 return AVERROR_INVALIDDATA;
205 magnitude = get_bits(gbc, width);
206 sign = get_bits1(gbc);
207 value = sign ? -(int32_t)magnitude : magnitude;
209 if (ctx->trace_enable) {
212 for (i = 0; i < width; i++)
213 bits[i] = magnitude >> (width - i - 1) & 1 ? '1' : '0';
214 bits[i] = sign ? '1' : '0';
217 ff_cbs_trace_syntax_element(ctx, position,
218 name, subscripts, bits, value);
225 static int cbs_av1_write_su(CodedBitstreamContext *ctx, PutBitContext *pbc,
226 int width, const char *name,
227 const int *subscripts, int32_t value)
232 if (put_bits_left(pbc) < width + 1)
233 return AVERROR(ENOSPC);
236 magnitude = sign ? -value : value;
238 if (ctx->trace_enable) {
241 for (i = 0; i < width; i++)
242 bits[i] = magnitude >> (width - i - 1) & 1 ? '1' : '0';
243 bits[i] = sign ? '1' : '0';
246 ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc),
247 name, subscripts, bits, value);
250 put_bits(pbc, width, magnitude);
251 put_bits(pbc, 1, sign);
256 static int cbs_av1_read_ns(CodedBitstreamContext *ctx, GetBitContext *gbc,
257 uint32_t n, const char *name,
258 const int *subscripts, uint32_t *write_to)
260 uint32_t w, m, v, extra_bit, value;
265 if (ctx->trace_enable)
266 position = get_bits_count(gbc);
271 if (get_bits_left(gbc) < w) {
272 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid non-symmetric value at "
273 "%s: bitstream ended.\n", name);
274 return AVERROR_INVALIDDATA;
278 v = get_bits(gbc, w - 1);
285 extra_bit = get_bits1(gbc);
286 value = (v << 1) - m + extra_bit;
289 if (ctx->trace_enable) {
292 for (i = 0; i < w - 1; i++)
293 bits[i] = (v >> i & 1) ? '1' : '0';
295 bits[i++] = extra_bit ? '1' : '0';
298 ff_cbs_trace_syntax_element(ctx, position,
299 name, subscripts, bits, value);
306 static int cbs_av1_write_ns(CodedBitstreamContext *ctx, PutBitContext *pbc,
307 uint32_t n, const char *name,
308 const int *subscripts, uint32_t value)
310 uint32_t w, m, v, extra_bit;
314 av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
315 "%"PRIu32", but must be in [0,%"PRIu32"].\n",
317 return AVERROR_INVALIDDATA;
320 if (ctx->trace_enable)
321 position = put_bits_count(pbc);
326 if (put_bits_left(pbc) < w)
327 return AVERROR(ENOSPC);
331 put_bits(pbc, w - 1, v);
333 v = m + ((value - m) >> 1);
334 extra_bit = (value - m) & 1;
335 put_bits(pbc, w - 1, v);
336 put_bits(pbc, 1, extra_bit);
339 if (ctx->trace_enable) {
342 for (i = 0; i < w - 1; i++)
343 bits[i] = (v >> i & 1) ? '1' : '0';
345 bits[i++] = extra_bit ? '1' : '0';
348 ff_cbs_trace_syntax_element(ctx, position,
349 name, subscripts, bits, value);
355 static int cbs_av1_read_increment(CodedBitstreamContext *ctx, GetBitContext *gbc,
356 uint32_t range_min, uint32_t range_max,
357 const char *name, uint32_t *write_to)
363 av_assert0(range_min <= range_max && range_max - range_min < sizeof(bits) - 1);
364 if (ctx->trace_enable)
365 position = get_bits_count(gbc);
367 for (i = 0, value = range_min; value < range_max;) {
368 if (get_bits_left(gbc) < 1) {
369 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid increment value at "
370 "%s: bitstream ended.\n", name);
371 return AVERROR_INVALIDDATA;
373 if (get_bits1(gbc)) {
382 if (ctx->trace_enable) {
384 ff_cbs_trace_syntax_element(ctx, position,
385 name, NULL, bits, value);
392 static int cbs_av1_write_increment(CodedBitstreamContext *ctx, PutBitContext *pbc,
393 uint32_t range_min, uint32_t range_max,
394 const char *name, uint32_t value)
398 av_assert0(range_min <= range_max && range_max - range_min < 32);
399 if (value < range_min || value > range_max) {
400 av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
401 "%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
402 name, value, range_min, range_max);
403 return AVERROR_INVALIDDATA;
406 if (value == range_max)
407 len = range_max - range_min;
409 len = value - range_min + 1;
410 if (put_bits_left(pbc) < len)
411 return AVERROR(ENOSPC);
413 if (ctx->trace_enable) {
416 for (i = 0; i < len; i++) {
417 if (range_min + i == value)
423 ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc),
424 name, NULL, bits, value);
428 put_bits(pbc, len, (1 << len) - 1 - (value != range_max));
433 static int cbs_av1_read_subexp(CodedBitstreamContext *ctx, GetBitContext *gbc,
434 uint32_t range_max, const char *name,
435 const int *subscripts, uint32_t *write_to)
439 uint32_t max_len, len, range_offset, range_bits;
441 if (ctx->trace_enable)
442 position = get_bits_count(gbc);
444 av_assert0(range_max > 0);
445 max_len = av_log2(range_max - 1) - 3;
447 err = cbs_av1_read_increment(ctx, gbc, 0, max_len,
448 "subexp_more_bits", &len);
453 range_bits = 2 + len;
454 range_offset = 1 << range_bits;
461 err = ff_cbs_read_unsigned(ctx, gbc, range_bits,
462 "subexp_bits", NULL, &value,
463 0, MAX_UINT_BITS(range_bits));
468 err = cbs_av1_read_ns(ctx, gbc, range_max - range_offset,
469 "subexp_final_bits", NULL, &value);
473 value += range_offset;
475 if (ctx->trace_enable)
476 ff_cbs_trace_syntax_element(ctx, position,
477 name, subscripts, "", value);
483 static int cbs_av1_write_subexp(CodedBitstreamContext *ctx, PutBitContext *pbc,
484 uint32_t range_max, const char *name,
485 const int *subscripts, uint32_t value)
488 uint32_t max_len, len, range_offset, range_bits;
490 if (value > range_max) {
491 av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
492 "%"PRIu32", but must be in [0,%"PRIu32"].\n",
493 name, value, range_max);
494 return AVERROR_INVALIDDATA;
497 if (ctx->trace_enable)
498 position = put_bits_count(pbc);
500 av_assert0(range_max > 0);
501 max_len = av_log2(range_max - 1) - 3;
508 range_bits = av_log2(value);
509 len = range_bits - 2;
511 // The top bin is combined with the one below it.
512 av_assert0(len == max_len + 1);
516 range_offset = 1 << range_bits;
519 err = cbs_av1_write_increment(ctx, pbc, 0, max_len,
520 "subexp_more_bits", len);
525 err = ff_cbs_write_unsigned(ctx, pbc, range_bits,
527 value - range_offset,
528 0, MAX_UINT_BITS(range_bits));
533 err = cbs_av1_write_ns(ctx, pbc, range_max - range_offset,
534 "subexp_final_bits", NULL,
535 value - range_offset);
540 if (ctx->trace_enable)
541 ff_cbs_trace_syntax_element(ctx, position,
542 name, subscripts, "", value);
548 static int cbs_av1_tile_log2(int blksize, int target)
551 for (k = 0; (blksize << k) < target; k++);
555 static int cbs_av1_get_relative_dist(const AV1RawSequenceHeader *seq,
556 unsigned int a, unsigned int b)
558 unsigned int diff, m;
559 if (!seq->enable_order_hint)
562 m = 1 << seq->order_hint_bits_minus_1;
563 diff = (diff & (m - 1)) - (diff & m);
568 #define HEADER(name) do { \
569 ff_cbs_trace_header(ctx, name); \
572 #define CHECK(call) do { \
578 #define FUNC_NAME(rw, codec, name) cbs_ ## codec ## _ ## rw ## _ ## name
579 #define FUNC_AV1(rw, name) FUNC_NAME(rw, av1, name)
580 #define FUNC(name) FUNC_AV1(READWRITE, name)
582 #define SUBSCRIPTS(subs, ...) (subs > 0 ? ((int[subs + 1]){ subs, __VA_ARGS__ }) : NULL)
584 #define fb(width, name) \
585 xf(width, name, current->name, 0, MAX_UINT_BITS(width), 0)
586 #define fc(width, name, range_min, range_max) \
587 xf(width, name, current->name, range_min, range_max, 0)
588 #define flag(name) fb(1, name)
589 #define su(width, name) \
590 xsu(width, name, current->name, 0)
592 #define fbs(width, name, subs, ...) \
593 xf(width, name, current->name, 0, MAX_UINT_BITS(width), subs, __VA_ARGS__)
594 #define fcs(width, name, range_min, range_max, subs, ...) \
595 xf(width, name, current->name, range_min, range_max, subs, __VA_ARGS__)
596 #define flags(name, subs, ...) \
597 xf(1, name, current->name, 0, 1, subs, __VA_ARGS__)
598 #define sus(width, name, subs, ...) \
599 xsu(width, name, current->name, subs, __VA_ARGS__)
601 #define fixed(width, name, value) do { \
602 av_unused uint32_t fixed_value = value; \
603 xf(width, name, fixed_value, value, value, 0); \
608 #define READWRITE read
609 #define RWContext GetBitContext
611 #define xf(width, name, var, range_min, range_max, subs, ...) do { \
612 uint32_t value = range_min; \
613 CHECK(ff_cbs_read_unsigned(ctx, rw, width, #name, \
614 SUBSCRIPTS(subs, __VA_ARGS__), \
615 &value, range_min, range_max)); \
619 #define xsu(width, name, var, subs, ...) do { \
621 CHECK(cbs_av1_read_su(ctx, rw, width, #name, \
622 SUBSCRIPTS(subs, __VA_ARGS__), &value)); \
626 #define uvlc(name, range_min, range_max) do { \
627 uint32_t value = range_min; \
628 CHECK(cbs_av1_read_uvlc(ctx, rw, #name, \
629 &value, range_min, range_max)); \
630 current->name = value; \
633 #define ns(max_value, name, subs, ...) do { \
634 uint32_t value = 0; \
635 CHECK(cbs_av1_read_ns(ctx, rw, max_value, #name, \
636 SUBSCRIPTS(subs, __VA_ARGS__), &value)); \
637 current->name = value; \
640 #define increment(name, min, max) do { \
641 uint32_t value = 0; \
642 CHECK(cbs_av1_read_increment(ctx, rw, min, max, #name, &value)); \
643 current->name = value; \
646 #define subexp(name, max, subs, ...) do { \
647 uint32_t value = 0; \
648 CHECK(cbs_av1_read_subexp(ctx, rw, max, #name, \
649 SUBSCRIPTS(subs, __VA_ARGS__), &value)); \
650 current->name = value; \
653 #define delta_q(name) do { \
654 uint8_t delta_coded; \
656 xf(1, name.delta_coded, delta_coded, 0, 1, 0); \
658 xsu(1 + 6, name.delta_q, delta_q, 0); \
661 current->name = delta_q; \
664 #define leb128(name) do { \
665 uint64_t value = 0; \
666 CHECK(cbs_av1_read_leb128(ctx, rw, #name, &value)); \
667 current->name = value; \
670 #define infer(name, value) do { \
671 current->name = value; \
674 #define byte_alignment(rw) (get_bits_count(rw) % 8)
676 #include "cbs_av1_syntax_template.c"
691 #undef byte_alignment
695 #define READWRITE write
696 #define RWContext PutBitContext
698 #define xf(width, name, var, range_min, range_max, subs, ...) do { \
699 CHECK(ff_cbs_write_unsigned(ctx, rw, width, #name, \
700 SUBSCRIPTS(subs, __VA_ARGS__), \
701 var, range_min, range_max)); \
704 #define xsu(width, name, var, subs, ...) do { \
705 CHECK(cbs_av1_write_su(ctx, rw, width, #name, \
706 SUBSCRIPTS(subs, __VA_ARGS__), var)); \
709 #define uvlc(name, range_min, range_max) do { \
710 CHECK(cbs_av1_write_uvlc(ctx, rw, #name, current->name, \
711 range_min, range_max)); \
714 #define ns(max_value, name, subs, ...) do { \
715 CHECK(cbs_av1_write_ns(ctx, rw, max_value, #name, \
716 SUBSCRIPTS(subs, __VA_ARGS__), \
720 #define increment(name, min, max) do { \
721 CHECK(cbs_av1_write_increment(ctx, rw, min, max, #name, \
725 #define subexp(name, max, subs, ...) do { \
726 CHECK(cbs_av1_write_subexp(ctx, rw, max, #name, \
727 SUBSCRIPTS(subs, __VA_ARGS__), \
731 #define delta_q(name) do { \
732 xf(1, name.delta_coded, current->name != 0, 0, 1, 0); \
734 xsu(1 + 6, name.delta_q, current->name, 0); \
737 #define leb128(name) do { \
738 CHECK(cbs_av1_write_leb128(ctx, rw, #name, current->name)); \
741 #define infer(name, value) do { \
742 if (current->name != (value)) { \
743 av_log(ctx->log_ctx, AV_LOG_WARNING, "Warning: " \
744 "%s does not match inferred value: " \
745 "%"PRId64", but should be %"PRId64".\n", \
746 #name, (int64_t)current->name, (int64_t)(value)); \
750 #define byte_alignment(rw) (put_bits_count(rw) % 8)
752 #include "cbs_av1_syntax_template.c"
766 #undef byte_alignment
769 static int cbs_av1_split_fragment(CodedBitstreamContext *ctx,
770 CodedBitstreamFragment *frag,
779 // Don't include this parsing in trace output.
780 trace = ctx->trace_enable;
781 ctx->trace_enable = 0;
784 size = frag->data_size;
786 if (INT_MAX / 8 < size) {
787 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid fragment: "
788 "too large (%zu bytes).\n", size);
789 err = AVERROR_INVALIDDATA;
794 AV1RawOBUHeader header;
797 init_get_bits(&gbc, data, 8 * size);
799 err = cbs_av1_read_obu_header(ctx, &gbc, &header);
803 if (!header.obu_has_size_field) {
804 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid OBU for raw "
805 "stream: size field must be present.\n");
806 err = AVERROR_INVALIDDATA;
810 if (get_bits_left(&gbc) < 8) {
811 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid OBU: fragment "
812 "too short (%zu bytes).\n", size);
813 err = AVERROR_INVALIDDATA;
817 err = cbs_av1_read_leb128(ctx, &gbc, "obu_size", &obu_size);
821 pos = get_bits_count(&gbc);
822 av_assert0(pos % 8 == 0 && pos / 8 <= size);
824 obu_length = pos / 8 + obu_size;
826 if (size < obu_length) {
827 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid OBU length: "
828 "%"PRIu64", but only %zu bytes remaining in fragment.\n",
830 err = AVERROR_INVALIDDATA;
834 err = ff_cbs_insert_unit_data(ctx, frag, -1, header.obu_type,
835 data, obu_length, frag->data_ref);
845 ctx->trace_enable = trace;
849 static void cbs_av1_free_tile_data(AV1RawTileData *td)
851 av_buffer_unref(&td->data_ref);
854 static void cbs_av1_free_metadata(AV1RawMetadata *md)
856 switch (md->metadata_type) {
857 case AV1_METADATA_TYPE_ITUT_T35:
858 av_buffer_unref(&md->metadata.itut_t35.payload_ref);
863 static void cbs_av1_free_obu(void *unit, uint8_t *content)
865 AV1RawOBU *obu = (AV1RawOBU*)content;
867 switch (obu->header.obu_type) {
868 case AV1_OBU_TILE_GROUP:
869 cbs_av1_free_tile_data(&obu->obu.tile_group.tile_data);
872 cbs_av1_free_tile_data(&obu->obu.frame.tile_group.tile_data);
874 case AV1_OBU_TILE_LIST:
875 cbs_av1_free_tile_data(&obu->obu.tile_list.tile_data);
877 case AV1_OBU_METADATA:
878 cbs_av1_free_metadata(&obu->obu.metadata);
885 static int cbs_av1_ref_tile_data(CodedBitstreamContext *ctx,
886 CodedBitstreamUnit *unit,
892 pos = get_bits_count(gbc);
893 if (pos >= 8 * unit->data_size) {
894 av_log(ctx->log_ctx, AV_LOG_ERROR, "Bitstream ended before "
895 "any data in tile group (%d bits read).\n", pos);
896 return AVERROR_INVALIDDATA;
898 // Must be byte-aligned at this point.
899 av_assert0(pos % 8 == 0);
901 td->data_ref = av_buffer_ref(unit->data_ref);
903 return AVERROR(ENOMEM);
905 td->data = unit->data + pos / 8;
906 td->data_size = unit->data_size - pos / 8;
911 static int cbs_av1_read_unit(CodedBitstreamContext *ctx,
912 CodedBitstreamUnit *unit)
914 CodedBitstreamAV1Context *priv = ctx->priv_data;
917 int err, start_pos, end_pos;
919 err = ff_cbs_alloc_unit_content(ctx, unit, sizeof(*obu),
925 err = init_get_bits(&gbc, unit->data, 8 * unit->data_size);
929 err = cbs_av1_read_obu_header(ctx, &gbc, &obu->header);
932 av_assert0(obu->header.obu_type == unit->type);
934 if (obu->header.obu_has_size_field) {
936 err = cbs_av1_read_leb128(ctx, &gbc, "obu_size", &obu_size);
939 obu->obu_size = obu_size;
941 if (unit->data_size < 1 + obu->header.obu_extension_flag) {
942 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid OBU length: "
943 "unit too short (%zu).\n", unit->data_size);
944 return AVERROR_INVALIDDATA;
946 obu->obu_size = unit->data_size - 1 - obu->header.obu_extension_flag;
949 start_pos = get_bits_count(&gbc);
951 if (obu->header.obu_extension_flag) {
952 priv->temporal_id = obu->header.temporal_id;
953 priv->spatial_id = obu->header.temporal_id;
955 if (obu->header.obu_type != AV1_OBU_SEQUENCE_HEADER &&
956 obu->header.obu_type != AV1_OBU_TEMPORAL_DELIMITER &&
957 priv->operating_point_idc) {
958 int in_temporal_layer =
959 (priv->operating_point_idc >> priv->temporal_id ) & 1;
960 int in_spatial_layer =
961 (priv->operating_point_idc >> (priv->spatial_id + 8)) & 1;
962 if (!in_temporal_layer || !in_spatial_layer) {
963 // Decoding will drop this OBU at this operating point.
967 priv->temporal_id = 0;
968 priv->spatial_id = 0;
971 switch (obu->header.obu_type) {
972 case AV1_OBU_SEQUENCE_HEADER:
974 err = cbs_av1_read_sequence_header_obu(ctx, &gbc,
975 &obu->obu.sequence_header);
979 av_buffer_unref(&priv->sequence_header_ref);
980 priv->sequence_header = NULL;
982 priv->sequence_header_ref = av_buffer_ref(unit->content_ref);
983 if (!priv->sequence_header_ref)
984 return AVERROR(ENOMEM);
985 priv->sequence_header = &obu->obu.sequence_header;
988 case AV1_OBU_TEMPORAL_DELIMITER:
990 err = cbs_av1_read_temporal_delimiter_obu(ctx, &gbc);
995 case AV1_OBU_FRAME_HEADER:
996 case AV1_OBU_REDUNDANT_FRAME_HEADER:
998 err = cbs_av1_read_frame_header_obu(ctx, &gbc,
999 &obu->obu.frame_header);
1004 case AV1_OBU_TILE_GROUP:
1006 err = cbs_av1_read_tile_group_obu(ctx, &gbc,
1007 &obu->obu.tile_group);
1011 err = cbs_av1_ref_tile_data(ctx, unit, &gbc,
1012 &obu->obu.tile_group.tile_data);
1019 err = cbs_av1_read_frame_obu(ctx, &gbc, &obu->obu.frame);
1023 err = cbs_av1_ref_tile_data(ctx, unit, &gbc,
1024 &obu->obu.frame.tile_group.tile_data);
1029 case AV1_OBU_TILE_LIST:
1031 err = cbs_av1_read_tile_list_obu(ctx, &gbc,
1032 &obu->obu.tile_list);
1036 err = cbs_av1_ref_tile_data(ctx, unit, &gbc,
1037 &obu->obu.tile_list.tile_data);
1042 case AV1_OBU_METADATA:
1044 err = cbs_av1_read_metadata_obu(ctx, &gbc, &obu->obu.metadata);
1049 case AV1_OBU_PADDING:
1051 return AVERROR(ENOSYS);
1054 end_pos = get_bits_count(&gbc);
1055 av_assert0(end_pos <= unit->data_size * 8);
1057 if (obu->obu_size > 0 &&
1058 obu->header.obu_type != AV1_OBU_TILE_GROUP &&
1059 obu->header.obu_type != AV1_OBU_FRAME) {
1060 err = cbs_av1_read_trailing_bits(ctx, &gbc,
1061 obu->obu_size * 8 + start_pos - end_pos);
1069 static int cbs_av1_write_obu(CodedBitstreamContext *ctx,
1070 CodedBitstreamUnit *unit,
1073 CodedBitstreamAV1Context *priv = ctx->priv_data;
1074 AV1RawOBU *obu = unit->content;
1075 PutBitContext pbc_tmp;
1078 int err, start_pos, end_pos, data_pos;
1080 // OBUs in the normal bitstream format must contain a size field
1081 // in every OBU (in annex B it is optional, but we don't support
1083 obu->header.obu_has_size_field = 1;
1085 err = cbs_av1_write_obu_header(ctx, pbc, &obu->header);
1089 if (obu->header.obu_has_size_field) {
1091 // Add space for the size field to fill later.
1097 start_pos = put_bits_count(pbc);
1099 switch (obu->header.obu_type) {
1100 case AV1_OBU_SEQUENCE_HEADER:
1102 err = cbs_av1_write_sequence_header_obu(ctx, pbc,
1103 &obu->obu.sequence_header);
1107 av_buffer_unref(&priv->sequence_header_ref);
1108 priv->sequence_header = NULL;
1110 priv->sequence_header_ref = av_buffer_ref(unit->content_ref);
1111 if (!priv->sequence_header_ref)
1112 return AVERROR(ENOMEM);
1113 priv->sequence_header = &obu->obu.sequence_header;
1116 case AV1_OBU_TEMPORAL_DELIMITER:
1118 err = cbs_av1_write_temporal_delimiter_obu(ctx, pbc);
1123 case AV1_OBU_FRAME_HEADER:
1124 case AV1_OBU_REDUNDANT_FRAME_HEADER:
1126 err = cbs_av1_write_frame_header_obu(ctx, pbc,
1127 &obu->obu.frame_header);
1132 case AV1_OBU_TILE_GROUP:
1134 err = cbs_av1_write_tile_group_obu(ctx, pbc,
1135 &obu->obu.tile_group);
1139 td = &obu->obu.tile_group.tile_data;
1144 err = cbs_av1_write_frame_obu(ctx, pbc, &obu->obu.frame);
1148 td = &obu->obu.frame.tile_group.tile_data;
1151 case AV1_OBU_TILE_LIST:
1153 err = cbs_av1_write_tile_list_obu(ctx, pbc, &obu->obu.tile_list);
1157 td = &obu->obu.tile_list.tile_data;
1160 case AV1_OBU_METADATA:
1162 err = cbs_av1_write_metadata_obu(ctx, pbc, &obu->obu.metadata);
1167 case AV1_OBU_PADDING:
1169 return AVERROR(ENOSYS);
1172 end_pos = put_bits_count(pbc);
1173 header_size = (end_pos - start_pos + 7) / 8;
1175 obu->obu_size = header_size + td->data_size;
1176 } else if (header_size > 0) {
1177 // Add trailing bits and recalculate.
1178 err = cbs_av1_write_trailing_bits(ctx, pbc, 8 - end_pos % 8);
1181 end_pos = put_bits_count(pbc);
1182 obu->obu_size = (end_pos - start_pos + 7) / 8;
1188 end_pos = put_bits_count(pbc);
1189 // Must now be byte-aligned.
1190 av_assert0(end_pos % 8 == 0);
1191 flush_put_bits(pbc);
1196 err = cbs_av1_write_leb128(ctx, pbc, "obu_size", obu->obu_size);
1200 data_pos = put_bits_count(pbc) / 8;
1201 flush_put_bits(pbc);
1202 av_assert0(data_pos <= start_pos);
1204 if (8 * obu->obu_size > put_bits_left(pbc))
1205 return AVERROR(ENOSPC);
1207 if (obu->obu_size > 0) {
1208 memmove(priv->write_buffer + data_pos,
1209 priv->write_buffer + start_pos, header_size);
1210 skip_put_bytes(pbc, header_size);
1213 memcpy(priv->write_buffer + data_pos + header_size,
1214 td->data, td->data_size);
1215 skip_put_bytes(pbc, td->data_size);
1222 static int cbs_av1_write_unit(CodedBitstreamContext *ctx,
1223 CodedBitstreamUnit *unit)
1225 CodedBitstreamAV1Context *priv = ctx->priv_data;
1229 if (!priv->write_buffer) {
1230 // Initial write buffer size is 1MB.
1231 priv->write_buffer_size = 1024 * 1024;
1233 reallocate_and_try_again:
1234 err = av_reallocp(&priv->write_buffer, priv->write_buffer_size);
1236 av_log(ctx->log_ctx, AV_LOG_ERROR, "Unable to allocate a "
1237 "sufficiently large write buffer (last attempt "
1238 "%zu bytes).\n", priv->write_buffer_size);
1243 init_put_bits(&pbc, priv->write_buffer, priv->write_buffer_size);
1245 err = cbs_av1_write_obu(ctx, unit, &pbc);
1246 if (err == AVERROR(ENOSPC)) {
1248 priv->write_buffer_size *= 2;
1249 goto reallocate_and_try_again;
1254 // Overflow but we didn't notice.
1255 av_assert0(put_bits_count(&pbc) <= 8 * priv->write_buffer_size);
1257 // OBU data must be byte-aligned.
1258 av_assert0(put_bits_count(&pbc) % 8 == 0);
1260 unit->data_size = put_bits_count(&pbc) / 8;
1261 flush_put_bits(&pbc);
1263 err = ff_cbs_alloc_unit_data(ctx, unit, unit->data_size);
1267 memcpy(unit->data, priv->write_buffer, unit->data_size);
1272 static int cbs_av1_assemble_fragment(CodedBitstreamContext *ctx,
1273 CodedBitstreamFragment *frag)
1279 for (i = 0; i < frag->nb_units; i++)
1280 size += frag->units[i].data_size;
1282 frag->data_ref = av_buffer_alloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
1283 if (!frag->data_ref)
1284 return AVERROR(ENOMEM);
1285 frag->data = frag->data_ref->data;
1286 memset(frag->data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
1289 for (i = 0; i < frag->nb_units; i++) {
1290 memcpy(frag->data + pos, frag->units[i].data,
1291 frag->units[i].data_size);
1292 pos += frag->units[i].data_size;
1294 av_assert0(pos == size);
1295 frag->data_size = size;
1300 static void cbs_av1_close(CodedBitstreamContext *ctx)
1302 CodedBitstreamAV1Context *priv = ctx->priv_data;
1304 av_buffer_unref(&priv->sequence_header_ref);
1306 av_freep(&priv->write_buffer);
1309 const CodedBitstreamType ff_cbs_type_av1 = {
1310 .codec_id = AV_CODEC_ID_AV1,
1312 .priv_data_size = sizeof(CodedBitstreamAV1Context),
1314 .split_fragment = &cbs_av1_split_fragment,
1315 .read_unit = &cbs_av1_read_unit,
1316 .write_unit = &cbs_av1_write_unit,
1317 .assemble_fragment = &cbs_av1_assemble_fragment,
1319 .close = &cbs_av1_close,