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
23 #include "libavutil/avassert.h"
24 #include "libavutil/buffer.h"
25 #include "libavutil/common.h"
28 #include "cbs_internal.h"
31 static const CodedBitstreamType *cbs_type_table[] = {
52 const enum AVCodecID ff_cbs_all_codec_ids[] = {
66 AV_CODEC_ID_MPEG2VIDEO,
74 int ff_cbs_init(CodedBitstreamContext **ctx_ptr,
75 enum AVCodecID codec_id, void *log_ctx)
77 CodedBitstreamContext *ctx;
78 const CodedBitstreamType *type;
82 for (i = 0; i < FF_ARRAY_ELEMS(cbs_type_table); i++) {
83 if (cbs_type_table[i]->codec_id == codec_id) {
84 type = cbs_type_table[i];
89 return AVERROR(EINVAL);
91 ctx = av_mallocz(sizeof(*ctx));
93 return AVERROR(ENOMEM);
95 ctx->log_ctx = log_ctx;
98 if (type->priv_data_size) {
99 ctx->priv_data = av_mallocz(ctx->codec->priv_data_size);
100 if (!ctx->priv_data) {
102 return AVERROR(ENOMEM);
106 ctx->decompose_unit_types = NULL;
108 ctx->trace_enable = 0;
109 ctx->trace_level = AV_LOG_TRACE;
115 void ff_cbs_flush(CodedBitstreamContext *ctx)
117 if (ctx->codec && ctx->codec->flush)
118 ctx->codec->flush(ctx);
121 void ff_cbs_close(CodedBitstreamContext **ctx_ptr)
123 CodedBitstreamContext *ctx = *ctx_ptr;
128 if (ctx->codec && ctx->codec->close)
129 ctx->codec->close(ctx);
131 av_freep(&ctx->write_buffer);
132 av_freep(&ctx->priv_data);
136 static void cbs_unit_uninit(CodedBitstreamUnit *unit)
138 av_buffer_unref(&unit->content_ref);
139 unit->content = NULL;
141 av_buffer_unref(&unit->data_ref);
144 unit->data_bit_padding = 0;
147 void ff_cbs_fragment_reset(CodedBitstreamFragment *frag)
151 for (i = 0; i < frag->nb_units; i++)
152 cbs_unit_uninit(&frag->units[i]);
155 av_buffer_unref(&frag->data_ref);
158 frag->data_bit_padding = 0;
161 void ff_cbs_fragment_free(CodedBitstreamFragment *frag)
163 ff_cbs_fragment_reset(frag);
165 av_freep(&frag->units);
166 frag->nb_units_allocated = 0;
169 static int cbs_read_fragment_content(CodedBitstreamContext *ctx,
170 CodedBitstreamFragment *frag)
174 for (i = 0; i < frag->nb_units; i++) {
175 CodedBitstreamUnit *unit = &frag->units[i];
177 if (ctx->decompose_unit_types) {
178 for (j = 0; j < ctx->nb_decompose_unit_types; j++) {
179 if (ctx->decompose_unit_types[j] == unit->type)
182 if (j >= ctx->nb_decompose_unit_types)
186 av_buffer_unref(&unit->content_ref);
187 unit->content = NULL;
189 av_assert0(unit->data && unit->data_ref);
191 err = ctx->codec->read_unit(ctx, unit);
192 if (err == AVERROR(ENOSYS)) {
193 av_log(ctx->log_ctx, AV_LOG_VERBOSE,
194 "Decomposition unimplemented for unit %d "
195 "(type %"PRIu32").\n", i, unit->type);
196 } else if (err < 0) {
197 av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to read unit %d "
198 "(type %"PRIu32").\n", i, unit->type);
206 static int cbs_fill_fragment_data(CodedBitstreamFragment *frag,
207 const uint8_t *data, size_t size)
209 av_assert0(!frag->data && !frag->data_ref);
212 av_buffer_alloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
214 return AVERROR(ENOMEM);
216 frag->data = frag->data_ref->data;
217 frag->data_size = size;
219 memcpy(frag->data, data, size);
220 memset(frag->data + size, 0,
221 AV_INPUT_BUFFER_PADDING_SIZE);
226 int ff_cbs_read_extradata(CodedBitstreamContext *ctx,
227 CodedBitstreamFragment *frag,
228 const AVCodecParameters *par)
232 err = cbs_fill_fragment_data(frag, par->extradata,
233 par->extradata_size);
237 err = ctx->codec->split_fragment(ctx, frag, 1);
241 return cbs_read_fragment_content(ctx, frag);
244 int ff_cbs_read_packet(CodedBitstreamContext *ctx,
245 CodedBitstreamFragment *frag,
251 frag->data_ref = av_buffer_ref(pkt->buf);
253 return AVERROR(ENOMEM);
255 frag->data = pkt->data;
256 frag->data_size = pkt->size;
259 err = cbs_fill_fragment_data(frag, pkt->data, pkt->size);
264 err = ctx->codec->split_fragment(ctx, frag, 0);
268 return cbs_read_fragment_content(ctx, frag);
271 int ff_cbs_read(CodedBitstreamContext *ctx,
272 CodedBitstreamFragment *frag,
273 const uint8_t *data, size_t size)
277 err = cbs_fill_fragment_data(frag, data, size);
281 err = ctx->codec->split_fragment(ctx, frag, 0);
285 return cbs_read_fragment_content(ctx, frag);
288 static int cbs_write_unit_data(CodedBitstreamContext *ctx,
289 CodedBitstreamUnit *unit)
294 if (!ctx->write_buffer) {
295 // Initial write buffer size is 1MB.
296 ctx->write_buffer_size = 1024 * 1024;
298 reallocate_and_try_again:
299 ret = av_reallocp(&ctx->write_buffer, ctx->write_buffer_size);
301 av_log(ctx->log_ctx, AV_LOG_ERROR, "Unable to allocate a "
302 "sufficiently large write buffer (last attempt "
303 "%"SIZE_SPECIFIER" bytes).\n", ctx->write_buffer_size);
308 init_put_bits(&pbc, ctx->write_buffer, ctx->write_buffer_size);
310 ret = ctx->codec->write_unit(ctx, unit, &pbc);
312 if (ret == AVERROR(ENOSPC)) {
314 if (ctx->write_buffer_size == INT_MAX / 8)
315 return AVERROR(ENOMEM);
316 ctx->write_buffer_size = FFMIN(2 * ctx->write_buffer_size, INT_MAX / 8);
317 goto reallocate_and_try_again;
319 // Write failed for some other reason.
323 // Overflow but we didn't notice.
324 av_assert0(put_bits_count(&pbc) <= 8 * ctx->write_buffer_size);
326 if (put_bits_count(&pbc) % 8)
327 unit->data_bit_padding = 8 - put_bits_count(&pbc) % 8;
329 unit->data_bit_padding = 0;
331 flush_put_bits(&pbc);
333 ret = ff_cbs_alloc_unit_data(unit, put_bits_count(&pbc) / 8);
337 memcpy(unit->data, ctx->write_buffer, unit->data_size);
342 int ff_cbs_write_fragment_data(CodedBitstreamContext *ctx,
343 CodedBitstreamFragment *frag)
347 for (i = 0; i < frag->nb_units; i++) {
348 CodedBitstreamUnit *unit = &frag->units[i];
353 av_buffer_unref(&unit->data_ref);
356 err = cbs_write_unit_data(ctx, unit);
358 av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to write unit %d "
359 "(type %"PRIu32").\n", i, unit->type);
362 av_assert0(unit->data && unit->data_ref);
365 av_buffer_unref(&frag->data_ref);
368 err = ctx->codec->assemble_fragment(ctx, frag);
370 av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to assemble fragment.\n");
373 av_assert0(frag->data && frag->data_ref);
378 int ff_cbs_write_extradata(CodedBitstreamContext *ctx,
379 AVCodecParameters *par,
380 CodedBitstreamFragment *frag)
384 err = ff_cbs_write_fragment_data(ctx, frag);
388 av_freep(&par->extradata);
390 par->extradata = av_malloc(frag->data_size +
391 AV_INPUT_BUFFER_PADDING_SIZE);
393 return AVERROR(ENOMEM);
395 memcpy(par->extradata, frag->data, frag->data_size);
396 memset(par->extradata + frag->data_size, 0,
397 AV_INPUT_BUFFER_PADDING_SIZE);
398 par->extradata_size = frag->data_size;
403 int ff_cbs_write_packet(CodedBitstreamContext *ctx,
405 CodedBitstreamFragment *frag)
410 err = ff_cbs_write_fragment_data(ctx, frag);
414 buf = av_buffer_ref(frag->data_ref);
416 return AVERROR(ENOMEM);
418 av_buffer_unref(&pkt->buf);
421 pkt->data = frag->data;
422 pkt->size = frag->data_size;
428 void ff_cbs_trace_header(CodedBitstreamContext *ctx,
431 if (!ctx->trace_enable)
434 av_log(ctx->log_ctx, ctx->trace_level, "%s\n", name);
437 void ff_cbs_trace_syntax_element(CodedBitstreamContext *ctx, int position,
438 const char *str, const int *subscripts,
439 const char *bits, int64_t value)
442 size_t name_len, bits_len;
443 int pad, subs, i, j, k, n;
445 if (!ctx->trace_enable)
448 av_assert0(value >= INT_MIN && value <= UINT32_MAX);
450 subs = subscripts ? subscripts[0] : 0;
452 for (i = j = 0; str[i];) {
456 k = snprintf(name + j, sizeof(name) - j, "[%d", subscripts[n]);
457 av_assert0(k > 0 && j + k < sizeof(name));
459 for (++i; str[i] && str[i] != ']'; i++);
460 av_assert0(str[i] == ']');
462 while (str[i] && str[i] != ']')
463 name[j++] = str[i++];
464 av_assert0(str[i] == ']');
467 av_assert0(j + 1 < sizeof(name));
468 name[j++] = str[i++];
471 av_assert0(j + 1 < sizeof(name));
473 av_assert0(n == subs);
475 name_len = strlen(name);
476 bits_len = strlen(bits);
478 if (name_len + bits_len > 60)
483 av_log(ctx->log_ctx, ctx->trace_level, "%-10d %s%*s = %"PRId64"\n",
484 position, name, pad, bits, value);
487 int ff_cbs_read_unsigned(CodedBitstreamContext *ctx, GetBitContext *gbc,
488 int width, const char *name,
489 const int *subscripts, uint32_t *write_to,
490 uint32_t range_min, uint32_t range_max)
495 av_assert0(width > 0 && width <= 32);
497 if (get_bits_left(gbc) < width) {
498 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid value at "
499 "%s: bitstream ended.\n", name);
500 return AVERROR_INVALIDDATA;
503 if (ctx->trace_enable)
504 position = get_bits_count(gbc);
506 value = get_bits_long(gbc, width);
508 if (ctx->trace_enable) {
511 for (i = 0; i < width; i++)
512 bits[i] = value >> (width - i - 1) & 1 ? '1' : '0';
515 ff_cbs_trace_syntax_element(ctx, position, name, subscripts,
519 if (value < range_min || value > range_max) {
520 av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
521 "%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
522 name, value, range_min, range_max);
523 return AVERROR_INVALIDDATA;
530 int ff_cbs_write_unsigned(CodedBitstreamContext *ctx, PutBitContext *pbc,
531 int width, const char *name,
532 const int *subscripts, uint32_t value,
533 uint32_t range_min, uint32_t range_max)
535 av_assert0(width > 0 && width <= 32);
537 if (value < range_min || value > range_max) {
538 av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
539 "%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
540 name, value, range_min, range_max);
541 return AVERROR_INVALIDDATA;
544 if (put_bits_left(pbc) < width)
545 return AVERROR(ENOSPC);
547 if (ctx->trace_enable) {
550 for (i = 0; i < width; i++)
551 bits[i] = value >> (width - i - 1) & 1 ? '1' : '0';
554 ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc),
555 name, subscripts, bits, value);
559 put_bits(pbc, width, value);
561 put_bits32(pbc, value);
566 int ff_cbs_read_signed(CodedBitstreamContext *ctx, GetBitContext *gbc,
567 int width, const char *name,
568 const int *subscripts, int32_t *write_to,
569 int32_t range_min, int32_t range_max)
574 av_assert0(width > 0 && width <= 32);
576 if (get_bits_left(gbc) < width) {
577 av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid value at "
578 "%s: bitstream ended.\n", name);
579 return AVERROR_INVALIDDATA;
582 if (ctx->trace_enable)
583 position = get_bits_count(gbc);
585 value = get_sbits_long(gbc, width);
587 if (ctx->trace_enable) {
590 for (i = 0; i < width; i++)
591 bits[i] = value & (1U << (width - i - 1)) ? '1' : '0';
594 ff_cbs_trace_syntax_element(ctx, position, name, subscripts,
598 if (value < range_min || value > range_max) {
599 av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
600 "%"PRId32", but must be in [%"PRId32",%"PRId32"].\n",
601 name, value, range_min, range_max);
602 return AVERROR_INVALIDDATA;
609 int ff_cbs_write_signed(CodedBitstreamContext *ctx, PutBitContext *pbc,
610 int width, const char *name,
611 const int *subscripts, int32_t value,
612 int32_t range_min, int32_t range_max)
614 av_assert0(width > 0 && width <= 32);
616 if (value < range_min || value > range_max) {
617 av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
618 "%"PRId32", but must be in [%"PRId32",%"PRId32"].\n",
619 name, value, range_min, range_max);
620 return AVERROR_INVALIDDATA;
623 if (put_bits_left(pbc) < width)
624 return AVERROR(ENOSPC);
626 if (ctx->trace_enable) {
629 for (i = 0; i < width; i++)
630 bits[i] = value & (1U << (width - i - 1)) ? '1' : '0';
633 ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc),
634 name, subscripts, bits, value);
638 put_sbits(pbc, width, value);
640 put_bits32(pbc, value);
646 int ff_cbs_alloc_unit_content(CodedBitstreamUnit *unit,
648 void (*free)(void *opaque, uint8_t *data))
650 av_assert0(!unit->content && !unit->content_ref);
652 unit->content = av_mallocz(size);
654 return AVERROR(ENOMEM);
656 unit->content_ref = av_buffer_create(unit->content, size,
658 if (!unit->content_ref) {
659 av_freep(&unit->content);
660 return AVERROR(ENOMEM);
666 int ff_cbs_alloc_unit_data(CodedBitstreamUnit *unit,
669 av_assert0(!unit->data && !unit->data_ref);
671 unit->data_ref = av_buffer_alloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
673 return AVERROR(ENOMEM);
675 unit->data = unit->data_ref->data;
676 unit->data_size = size;
678 memset(unit->data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
683 static int cbs_insert_unit(CodedBitstreamFragment *frag,
686 CodedBitstreamUnit *units;
688 if (frag->nb_units < frag->nb_units_allocated) {
691 if (position < frag->nb_units)
692 memmove(units + position + 1, units + position,
693 (frag->nb_units - position) * sizeof(*units));
695 units = av_malloc_array(frag->nb_units*2 + 1, sizeof(*units));
697 return AVERROR(ENOMEM);
699 frag->nb_units_allocated = 2*frag->nb_units_allocated + 1;
702 memcpy(units, frag->units, position * sizeof(*units));
704 if (position < frag->nb_units)
705 memcpy(units + position + 1, frag->units + position,
706 (frag->nb_units - position) * sizeof(*units));
709 memset(units + position, 0, sizeof(*units));
711 if (units != frag->units) {
712 av_free(frag->units);
721 int ff_cbs_insert_unit_content(CodedBitstreamFragment *frag,
723 CodedBitstreamUnitType type,
725 AVBufferRef *content_buf)
727 CodedBitstreamUnit *unit;
728 AVBufferRef *content_ref;
732 position = frag->nb_units;
733 av_assert0(position >= 0 && position <= frag->nb_units);
736 content_ref = av_buffer_ref(content_buf);
738 return AVERROR(ENOMEM);
743 err = cbs_insert_unit(frag, position);
745 av_buffer_unref(&content_ref);
749 unit = &frag->units[position];
751 unit->content = content;
752 unit->content_ref = content_ref;
757 int ff_cbs_insert_unit_data(CodedBitstreamFragment *frag,
759 CodedBitstreamUnitType type,
760 uint8_t *data, size_t data_size,
761 AVBufferRef *data_buf)
763 CodedBitstreamUnit *unit;
764 AVBufferRef *data_ref;
768 position = frag->nb_units;
769 av_assert0(position >= 0 && position <= frag->nb_units);
772 data_ref = av_buffer_ref(data_buf);
774 data_ref = av_buffer_create(data, data_size, NULL, NULL, 0);
778 return AVERROR(ENOMEM);
781 err = cbs_insert_unit(frag, position);
783 av_buffer_unref(&data_ref);
787 unit = &frag->units[position];
790 unit->data_size = data_size;
791 unit->data_ref = data_ref;
796 void ff_cbs_delete_unit(CodedBitstreamFragment *frag,
799 av_assert0(0 <= position && position < frag->nb_units
800 && "Unit to be deleted not in fragment.");
802 cbs_unit_uninit(&frag->units[position]);
806 if (frag->nb_units > 0)
807 memmove(frag->units + position,
808 frag->units + position + 1,
809 (frag->nb_units - position) * sizeof(*frag->units));
812 static void cbs_default_free_unit_content(void *opaque, uint8_t *data)
814 const CodedBitstreamUnitTypeDescriptor *desc = opaque;
815 if (desc->content_type == CBS_CONTENT_TYPE_INTERNAL_REFS) {
817 for (i = 0; i < desc->nb_ref_offsets; i++) {
818 void **ptr = (void**)(data + desc->ref_offsets[i]);
819 av_buffer_unref((AVBufferRef**)(ptr + 1));
825 static const CodedBitstreamUnitTypeDescriptor
826 *cbs_find_unit_type_desc(CodedBitstreamContext *ctx,
827 CodedBitstreamUnit *unit)
829 const CodedBitstreamUnitTypeDescriptor *desc;
832 if (!ctx->codec->unit_types)
836 desc = &ctx->codec->unit_types[i];
837 if (desc->nb_unit_types == 0)
839 if (desc->nb_unit_types == CBS_UNIT_TYPE_RANGE) {
840 if (unit->type >= desc->unit_type_range_start &&
841 unit->type <= desc->unit_type_range_end)
844 for (j = 0; j < desc->nb_unit_types; j++) {
845 if (desc->unit_types[j] == unit->type)
853 int ff_cbs_alloc_unit_content2(CodedBitstreamContext *ctx,
854 CodedBitstreamUnit *unit)
856 const CodedBitstreamUnitTypeDescriptor *desc;
858 av_assert0(!unit->content && !unit->content_ref);
860 desc = cbs_find_unit_type_desc(ctx, unit);
862 return AVERROR(ENOSYS);
864 unit->content = av_mallocz(desc->content_size);
866 return AVERROR(ENOMEM);
869 av_buffer_create(unit->content, desc->content_size,
870 desc->content_free ? desc->content_free
871 : cbs_default_free_unit_content,
873 if (!unit->content_ref) {
874 av_freep(&unit->content);
875 return AVERROR(ENOMEM);
881 static int cbs_clone_unit_content(AVBufferRef **clone_ref,
882 CodedBitstreamUnit *unit,
883 const CodedBitstreamUnitTypeDescriptor *desc)
886 uint8_t **src_ptr, **copy_ptr;
887 AVBufferRef **src_buf, **copy_buf;
890 av_assert0(unit->content);
893 copy = av_memdup(src, desc->content_size);
895 return AVERROR(ENOMEM);
897 for (i = 0; i < desc->nb_ref_offsets; i++) {
898 src_ptr = (uint8_t**)(src + desc->ref_offsets[i]);
899 src_buf = (AVBufferRef**)(src_ptr + 1);
900 copy_ptr = (uint8_t**)(copy + desc->ref_offsets[i]);
901 copy_buf = (AVBufferRef**)(copy_ptr + 1);
904 av_assert0(!*src_buf);
908 // We can't handle a non-refcounted pointer here - we don't
909 // have enough information to handle whatever structure lies
910 // at the other end of it.
911 err = AVERROR(EINVAL);
915 // src_ptr is required to point somewhere inside src_buf. If it
916 // doesn't, there is a bug somewhere.
917 av_assert0(*src_ptr >= (*src_buf)->data &&
918 *src_ptr < (*src_buf)->data + (*src_buf)->size);
920 *copy_buf = av_buffer_ref(*src_buf);
922 err = AVERROR(ENOMEM);
925 *copy_ptr = (*copy_buf)->data + (*src_ptr - (*src_buf)->data);
928 *clone_ref = av_buffer_create(copy, desc->content_size,
929 desc->content_free ? desc->content_free :
930 cbs_default_free_unit_content,
933 err = AVERROR(ENOMEM);
940 for (--i; i >= 0; i--)
941 av_buffer_unref((AVBufferRef**)(copy + desc->ref_offsets[i]));
947 int ff_cbs_make_unit_refcounted(CodedBitstreamContext *ctx,
948 CodedBitstreamUnit *unit)
950 const CodedBitstreamUnitTypeDescriptor *desc;
954 av_assert0(unit->content);
955 if (unit->content_ref) {
956 // Already refcounted, nothing to do.
960 desc = cbs_find_unit_type_desc(ctx, unit);
962 return AVERROR(ENOSYS);
964 switch (desc->content_type) {
965 case CBS_CONTENT_TYPE_POD:
966 ref = av_buffer_alloc(desc->content_size);
968 return AVERROR(ENOMEM);
969 memcpy(ref->data, unit->content, desc->content_size);
973 case CBS_CONTENT_TYPE_INTERNAL_REFS:
974 err = cbs_clone_unit_content(&ref, unit, desc);
977 case CBS_CONTENT_TYPE_COMPLEX:
978 if (!desc->content_clone)
979 return AVERROR_PATCHWELCOME;
980 err = desc->content_clone(&ref, unit);
984 av_assert0(0 && "Invalid content type.");
990 unit->content_ref = ref;
991 unit->content = ref->data;
995 int ff_cbs_make_unit_writable(CodedBitstreamContext *ctx,
996 CodedBitstreamUnit *unit)
998 const CodedBitstreamUnitTypeDescriptor *desc;
1002 // This can only be applied to refcounted units.
1003 err = ff_cbs_make_unit_refcounted(ctx, unit);
1006 av_assert0(unit->content && unit->content_ref);
1008 if (av_buffer_is_writable(unit->content_ref))
1011 desc = cbs_find_unit_type_desc(ctx, unit);
1013 return AVERROR(ENOSYS);
1015 switch (desc->content_type) {
1016 case CBS_CONTENT_TYPE_POD:
1017 err = av_buffer_make_writable(&unit->content_ref);
1020 case CBS_CONTENT_TYPE_INTERNAL_REFS:
1021 err = cbs_clone_unit_content(&ref, unit, desc);
1024 case CBS_CONTENT_TYPE_COMPLEX:
1025 if (!desc->content_clone)
1026 return AVERROR_PATCHWELCOME;
1027 err = desc->content_clone(&ref, unit);
1031 av_assert0(0 && "Invalid content type.");
1036 if (desc->content_type != CBS_CONTENT_TYPE_POD) {
1037 av_buffer_unref(&unit->content_ref);
1038 unit->content_ref = ref;
1040 unit->content = unit->content_ref->data;