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FFmpeg/libavcodec/cbs.c
Andreas Rheinhardt 3e9b8d14e5 avcodec/cbs: Use RefStruct-API for unit content 
This avoids allocations and error checks etc. as well
as duplicate pointer lists in the CodedBitstreamFooContexts.
It also avoids casting const away for use as opaque,
as the RefStruct API supports const opaques.

The fact that some of the units are not refcounted
(i.e. they are sometimes part of an encoding context
like VAAPIEncodeH264Context) meant that CodedBitstreamUnit
still contains two pointers, one to the content
and another ownership pointer, replacing the AVBufferRef* pointer.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2023-10-07 22:35:05 +02:00

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/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <string.h>
#include "config.h"
#include "libavutil/avassert.h"
#include "libavutil/buffer.h"
#include "libavutil/common.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "cbs.h"
#include "cbs_internal.h"
#include "refstruct.h"
static const CodedBitstreamType *const cbs_type_table[] = {
#if CONFIG_CBS_AV1
&ff_cbs_type_av1,
#endif
#if CONFIG_CBS_H264
&ff_cbs_type_h264,
#endif
#if CONFIG_CBS_H265
&ff_cbs_type_h265,
#endif
#if CONFIG_CBS_H266
&ff_cbs_type_h266,
#endif
#if CONFIG_CBS_JPEG
&ff_cbs_type_jpeg,
#endif
#if CONFIG_CBS_MPEG2
&ff_cbs_type_mpeg2,
#endif
#if CONFIG_CBS_VP9
&ff_cbs_type_vp9,
#endif
};
const enum AVCodecID ff_cbs_all_codec_ids[] = {
#if CONFIG_CBS_AV1
AV_CODEC_ID_AV1,
#endif
#if CONFIG_CBS_H264
AV_CODEC_ID_H264,
#endif
#if CONFIG_CBS_H265
AV_CODEC_ID_H265,
#endif
#if CONFIG_CBS_H266
AV_CODEC_ID_H266,
#endif
#if CONFIG_CBS_JPEG
AV_CODEC_ID_MJPEG,
#endif
#if CONFIG_CBS_MPEG2
AV_CODEC_ID_MPEG2VIDEO,
#endif
#if CONFIG_CBS_VP9
AV_CODEC_ID_VP9,
#endif
AV_CODEC_ID_NONE
};
av_cold int ff_cbs_init(CodedBitstreamContext **ctx_ptr,
enum AVCodecID codec_id, void *log_ctx)
{
CodedBitstreamContext *ctx;
const CodedBitstreamType *type;
int i;
type = NULL;
for (i = 0; i < FF_ARRAY_ELEMS(cbs_type_table); i++) {
if (cbs_type_table[i]->codec_id == codec_id) {
type = cbs_type_table[i];
break;
}
}
if (!type)
return AVERROR(EINVAL);
ctx = av_mallocz(sizeof(*ctx));
if (!ctx)
return AVERROR(ENOMEM);
ctx->log_ctx = log_ctx;
ctx->codec = type; /* Must be before any error */
if (type->priv_data_size) {
ctx->priv_data = av_mallocz(ctx->codec->priv_data_size);
if (!ctx->priv_data) {
av_freep(&ctx);
return AVERROR(ENOMEM);
}
if (type->priv_class) {
*(const AVClass **)ctx->priv_data = type->priv_class;
av_opt_set_defaults(ctx->priv_data);
}
}
ctx->decompose_unit_types = NULL;
ctx->trace_enable = 0;
ctx->trace_level = AV_LOG_TRACE;
ctx->trace_context = ctx;
*ctx_ptr = ctx;
return 0;
}
av_cold void ff_cbs_flush(CodedBitstreamContext *ctx)
{
if (ctx->codec->flush)
ctx->codec->flush(ctx);
}
av_cold void ff_cbs_close(CodedBitstreamContext **ctx_ptr)
{
CodedBitstreamContext *ctx = *ctx_ptr;
if (!ctx)
return;
if (ctx->codec->close)
ctx->codec->close(ctx);
av_freep(&ctx->write_buffer);
if (ctx->codec->priv_class && ctx->priv_data)
av_opt_free(ctx->priv_data);
av_freep(&ctx->priv_data);
av_freep(ctx_ptr);
}
static void cbs_unit_uninit(CodedBitstreamUnit *unit)
{
ff_refstruct_unref(&unit->content_ref);
unit->content = NULL;
av_buffer_unref(&unit->data_ref);
unit->data = NULL;
unit->data_size = 0;
unit->data_bit_padding = 0;
}
void ff_cbs_fragment_reset(CodedBitstreamFragment *frag)
{
int i;
for (i = 0; i < frag->nb_units; i++)
cbs_unit_uninit(&frag->units[i]);
frag->nb_units = 0;
av_buffer_unref(&frag->data_ref);
frag->data = NULL;
frag->data_size = 0;
frag->data_bit_padding = 0;
}
av_cold void ff_cbs_fragment_free(CodedBitstreamFragment *frag)
{
ff_cbs_fragment_reset(frag);
av_freep(&frag->units);
frag->nb_units_allocated = 0;
}
static int cbs_read_fragment_content(CodedBitstreamContext *ctx,
CodedBitstreamFragment *frag)
{
int err, i, j;
for (i = 0; i < frag->nb_units; i++) {
CodedBitstreamUnit *unit = &frag->units[i];
if (ctx->decompose_unit_types) {
for (j = 0; j < ctx->nb_decompose_unit_types; j++) {
if (ctx->decompose_unit_types[j] == unit->type)
break;
}
if (j >= ctx->nb_decompose_unit_types)
continue;
}
ff_refstruct_unref(&unit->content_ref);
unit->content = NULL;
av_assert0(unit->data && unit->data_ref);
err = ctx->codec->read_unit(ctx, unit);
if (err == AVERROR(ENOSYS)) {
av_log(ctx->log_ctx, AV_LOG_VERBOSE,
"Decomposition unimplemented for unit %d "
"(type %"PRIu32").\n", i, unit->type);
} else if (err == AVERROR(EAGAIN)) {
av_log(ctx->log_ctx, AV_LOG_VERBOSE,
"Skipping decomposition of unit %d "
"(type %"PRIu32").\n", i, unit->type);
ff_refstruct_unref(&unit->content_ref);
unit->content = NULL;
} else if (err < 0) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to read unit %d "
"(type %"PRIu32").\n", i, unit->type);
return err;
}
}
return 0;
}
static int cbs_fill_fragment_data(CodedBitstreamFragment *frag,
const uint8_t *data, size_t size)
{
av_assert0(!frag->data && !frag->data_ref);
frag->data_ref =
av_buffer_alloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!frag->data_ref)
return AVERROR(ENOMEM);
frag->data = frag->data_ref->data;
frag->data_size = size;
memcpy(frag->data, data, size);
memset(frag->data + size, 0,
AV_INPUT_BUFFER_PADDING_SIZE);
return 0;
}
static int cbs_read_data(CodedBitstreamContext *ctx,
CodedBitstreamFragment *frag,
AVBufferRef *buf,
const uint8_t *data, size_t size,
int header)
{
int err;
if (buf) {
frag->data_ref = av_buffer_ref(buf);
if (!frag->data_ref)
return AVERROR(ENOMEM);
frag->data = (uint8_t *)data;
frag->data_size = size;
} else {
err = cbs_fill_fragment_data(frag, data, size);
if (err < 0)
return err;
}
err = ctx->codec->split_fragment(ctx, frag, header);
if (err < 0)
return err;
return cbs_read_fragment_content(ctx, frag);
}
int ff_cbs_read_extradata(CodedBitstreamContext *ctx,
CodedBitstreamFragment *frag,
const AVCodecParameters *par)
{
return cbs_read_data(ctx, frag, NULL,
par->extradata,
par->extradata_size, 1);
}
int ff_cbs_read_extradata_from_codec(CodedBitstreamContext *ctx,
CodedBitstreamFragment *frag,
const AVCodecContext *avctx)
{
return cbs_read_data(ctx, frag, NULL,
avctx->extradata,
avctx->extradata_size, 1);
}
int ff_cbs_read_packet(CodedBitstreamContext *ctx,
CodedBitstreamFragment *frag,
const AVPacket *pkt)
{
return cbs_read_data(ctx, frag, pkt->buf,
pkt->data, pkt->size, 0);
}
int ff_cbs_read_packet_side_data(CodedBitstreamContext *ctx,
CodedBitstreamFragment *frag,
const AVPacket *pkt)
{
size_t side_data_size;
const uint8_t *side_data =
av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
&side_data_size);
return cbs_read_data(ctx, frag, NULL,
side_data, side_data_size, 1);
}
int ff_cbs_read(CodedBitstreamContext *ctx,
CodedBitstreamFragment *frag,
const uint8_t *data, size_t size)
{
return cbs_read_data(ctx, frag, NULL,
data, size, 0);
}
/**
* Allocate a new internal data buffer of the given size in the unit.
*
* The data buffer will have input padding.
*/
static int cbs_alloc_unit_data(CodedBitstreamUnit *unit,
size_t size)
{
av_assert0(!unit->data && !unit->data_ref);
unit->data_ref = av_buffer_alloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!unit->data_ref)
return AVERROR(ENOMEM);
unit->data = unit->data_ref->data;
unit->data_size = size;
memset(unit->data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
return 0;
}
static int cbs_write_unit_data(CodedBitstreamContext *ctx,
CodedBitstreamUnit *unit)
{
PutBitContext pbc;
int ret;
if (!ctx->write_buffer) {
// Initial write buffer size is 1MB.
ctx->write_buffer_size = 1024 * 1024;
reallocate_and_try_again:
ret = av_reallocp(&ctx->write_buffer, ctx->write_buffer_size);
if (ret < 0) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Unable to allocate a "
"sufficiently large write buffer (last attempt "
"%"SIZE_SPECIFIER" bytes).\n", ctx->write_buffer_size);
return ret;
}
}
init_put_bits(&pbc, ctx->write_buffer, ctx->write_buffer_size);
ret = ctx->codec->write_unit(ctx, unit, &pbc);
if (ret < 0) {
if (ret == AVERROR(ENOSPC)) {
// Overflow.
if (ctx->write_buffer_size == INT_MAX / 8)
return AVERROR(ENOMEM);
ctx->write_buffer_size = FFMIN(2 * ctx->write_buffer_size, INT_MAX / 8);
goto reallocate_and_try_again;
}
// Write failed for some other reason.
return ret;
}
// Overflow but we didn't notice.
av_assert0(put_bits_count(&pbc) <= 8 * ctx->write_buffer_size);
if (put_bits_count(&pbc) % 8)
unit->data_bit_padding = 8 - put_bits_count(&pbc) % 8;
else
unit->data_bit_padding = 0;
flush_put_bits(&pbc);
ret = cbs_alloc_unit_data(unit, put_bytes_output(&pbc));
if (ret < 0)
return ret;
memcpy(unit->data, ctx->write_buffer, unit->data_size);
return 0;
}
int ff_cbs_write_fragment_data(CodedBitstreamContext *ctx,
CodedBitstreamFragment *frag)
{
int err, i;
for (i = 0; i < frag->nb_units; i++) {
CodedBitstreamUnit *unit = &frag->units[i];
if (!unit->content)
continue;
av_buffer_unref(&unit->data_ref);
unit->data = NULL;
err = cbs_write_unit_data(ctx, unit);
if (err < 0) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to write unit %d "
"(type %"PRIu32").\n", i, unit->type);
return err;
}
av_assert0(unit->data && unit->data_ref);
}
av_buffer_unref(&frag->data_ref);
frag->data = NULL;
err = ctx->codec->assemble_fragment(ctx, frag);
if (err < 0) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to assemble fragment.\n");
return err;
}
av_assert0(frag->data && frag->data_ref);
return 0;
}
int ff_cbs_write_extradata(CodedBitstreamContext *ctx,
AVCodecParameters *par,
CodedBitstreamFragment *frag)
{
int err;
err = ff_cbs_write_fragment_data(ctx, frag);
if (err < 0)
return err;
av_freep(&par->extradata);
par->extradata_size = 0;
if (!frag->data_size)
return 0;
par->extradata = av_malloc(frag->data_size +
AV_INPUT_BUFFER_PADDING_SIZE);
if (!par->extradata)
return AVERROR(ENOMEM);
memcpy(par->extradata, frag->data, frag->data_size);
memset(par->extradata + frag->data_size, 0,
AV_INPUT_BUFFER_PADDING_SIZE);
par->extradata_size = frag->data_size;
return 0;
}
int ff_cbs_write_packet(CodedBitstreamContext *ctx,
AVPacket *pkt,
CodedBitstreamFragment *frag)
{
AVBufferRef *buf;
int err;
err = ff_cbs_write_fragment_data(ctx, frag);
if (err < 0)
return err;
buf = av_buffer_ref(frag->data_ref);
if (!buf)
return AVERROR(ENOMEM);
av_buffer_unref(&pkt->buf);
pkt->buf = buf;
pkt->data = frag->data;
pkt->size = frag->data_size;
return 0;
}
void ff_cbs_trace_header(CodedBitstreamContext *ctx,
const char *name)
{
if (!ctx->trace_enable)
return;
av_log(ctx->log_ctx, ctx->trace_level, "%s\n", name);
}
void ff_cbs_trace_read_log(void *trace_context,
GetBitContext *gbc, int length,
const char *str, const int *subscripts,
int64_t value)
{
CodedBitstreamContext *ctx = trace_context;
char name[256];
char bits[256];
size_t name_len, bits_len;
int pad, subs, i, j, k, n;
int position;
av_assert0(value >= INT_MIN && value <= UINT32_MAX);
position = get_bits_count(gbc);
av_assert0(length < 256);
for (i = 0; i < length; i++)
bits[i] = get_bits1(gbc) ? '1' : '0';
bits[length] = 0;
subs = subscripts ? subscripts[0] : 0;
n = 0;
for (i = j = 0; str[i];) {
if (str[i] == '[') {
if (n < subs) {
++n;
k = snprintf(name + j, sizeof(name) - j, "[%d", subscripts[n]);
av_assert0(k > 0 && j + k < sizeof(name));
j += k;
for (++i; str[i] && str[i] != ']'; i++);
av_assert0(str[i] == ']');
} else {
while (str[i] && str[i] != ']')
name[j++] = str[i++];
av_assert0(str[i] == ']');
}
} else {
av_assert0(j + 1 < sizeof(name));
name[j++] = str[i++];
}
}
av_assert0(j + 1 < sizeof(name));
name[j] = 0;
av_assert0(n == subs);
name_len = strlen(name);
bits_len = length;
if (name_len + bits_len > 60)
pad = bits_len + 2;
else
pad = 61 - name_len;
av_log(ctx->log_ctx, ctx->trace_level, "%-10d %s%*s = %"PRId64"\n",
position, name, pad, bits, value);
}
void ff_cbs_trace_write_log(void *trace_context,
PutBitContext *pbc, int length,
const char *str, const int *subscripts,
int64_t value)
{
CodedBitstreamContext *ctx = trace_context;
// Ensure that the syntax element is written to the output buffer,
// make a GetBitContext pointed at the start position, then call the
// read log function which can read the bits back to log them.
GetBitContext gbc;
int position;
if (length > 0) {
PutBitContext flush;
flush = *pbc;
flush_put_bits(&flush);
}
position = put_bits_count(pbc);
av_assert0(position >= length);
init_get_bits(&gbc, pbc->buf, position);
skip_bits_long(&gbc, position - length);
ff_cbs_trace_read_log(ctx, &gbc, length, str, subscripts, value);
}
static av_always_inline int cbs_read_unsigned(CodedBitstreamContext *ctx,
GetBitContext *gbc,
int width, const char *name,
const int *subscripts,
uint32_t *write_to,
uint32_t range_min,
uint32_t range_max)
{
uint32_t value;
CBS_TRACE_READ_START();
av_assert0(width > 0 && width <= 32);
if (get_bits_left(gbc) < width) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid value at "
"%s: bitstream ended.\n", name);
return AVERROR_INVALIDDATA;
}
value = get_bits_long(gbc, width);
CBS_TRACE_READ_END();
if (value < range_min || value > range_max) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
"%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
name, value, range_min, range_max);
return AVERROR_INVALIDDATA;
}
*write_to = value;
return 0;
}
int ff_cbs_read_unsigned(CodedBitstreamContext *ctx, GetBitContext *gbc,
int width, const char *name,
const int *subscripts, uint32_t *write_to,
uint32_t range_min, uint32_t range_max)
{
return cbs_read_unsigned(ctx, gbc, width, name, subscripts,
write_to, range_min, range_max);
}
int ff_cbs_read_simple_unsigned(CodedBitstreamContext *ctx, GetBitContext *gbc,
int width, const char *name, uint32_t *write_to)
{
return cbs_read_unsigned(ctx, gbc, width, name, NULL,
write_to, 0, UINT32_MAX);
}
int ff_cbs_write_unsigned(CodedBitstreamContext *ctx, PutBitContext *pbc,
int width, const char *name,
const int *subscripts, uint32_t value,
uint32_t range_min, uint32_t range_max)
{
CBS_TRACE_WRITE_START();
av_assert0(width > 0 && width <= 32);
if (value < range_min || value > range_max) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
"%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
name, value, range_min, range_max);
return AVERROR_INVALIDDATA;
}
if (put_bits_left(pbc) < width)
return AVERROR(ENOSPC);
if (width < 32)
put_bits(pbc, width, value);
else
put_bits32(pbc, value);
CBS_TRACE_WRITE_END();
return 0;
}
int ff_cbs_write_simple_unsigned(CodedBitstreamContext *ctx, PutBitContext *pbc,
int width, const char *name, uint32_t value)
{
return ff_cbs_write_unsigned(ctx, pbc, width, name, NULL,
value, 0, MAX_UINT_BITS(width));
}
int ff_cbs_read_signed(CodedBitstreamContext *ctx, GetBitContext *gbc,
int width, const char *name,
const int *subscripts, int32_t *write_to,
int32_t range_min, int32_t range_max)
{
int32_t value;
CBS_TRACE_READ_START();
av_assert0(width > 0 && width <= 32);
if (get_bits_left(gbc) < width) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid value at "
"%s: bitstream ended.\n", name);
return AVERROR_INVALIDDATA;
}
value = get_sbits_long(gbc, width);
CBS_TRACE_READ_END();
if (value < range_min || value > range_max) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
"%"PRId32", but must be in [%"PRId32",%"PRId32"].\n",
name, value, range_min, range_max);
return AVERROR_INVALIDDATA;
}
*write_to = value;
return 0;
}
int ff_cbs_write_signed(CodedBitstreamContext *ctx, PutBitContext *pbc,
int width, const char *name,
const int *subscripts, int32_t value,
int32_t range_min, int32_t range_max)
{
CBS_TRACE_WRITE_START();
av_assert0(width > 0 && width <= 32);
if (value < range_min || value > range_max) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
"%"PRId32", but must be in [%"PRId32",%"PRId32"].\n",
name, value, range_min, range_max);
return AVERROR_INVALIDDATA;
}
if (put_bits_left(pbc) < width)
return AVERROR(ENOSPC);
if (width < 32)
put_sbits(pbc, width, value);
else
put_bits32(pbc, value);
CBS_TRACE_WRITE_END();
return 0;
}
static int cbs_insert_unit(CodedBitstreamFragment *frag,
int position)
{
CodedBitstreamUnit *units;
if (frag->nb_units < frag->nb_units_allocated) {
units = frag->units;
if (position < frag->nb_units)
memmove(units + position + 1, units + position,
(frag->nb_units - position) * sizeof(*units));
} else {
units = av_malloc_array(frag->nb_units*2 + 1, sizeof(*units));
if (!units)
return AVERROR(ENOMEM);
frag->nb_units_allocated = 2*frag->nb_units_allocated + 1;
if (position > 0)
memcpy(units, frag->units, position * sizeof(*units));
if (position < frag->nb_units)
memcpy(units + position + 1, frag->units + position,
(frag->nb_units - position) * sizeof(*units));
}
memset(units + position, 0, sizeof(*units));
if (units != frag->units) {
av_free(frag->units);
frag->units = units;
}
++frag->nb_units;
return 0;
}
int ff_cbs_insert_unit_content(CodedBitstreamFragment *frag,
int position,
CodedBitstreamUnitType type,
void *content,
void *content_ref)
{
CodedBitstreamUnit *unit;
int err;
if (position == -1)
position = frag->nb_units;
av_assert0(position >= 0 && position <= frag->nb_units);
err = cbs_insert_unit(frag, position);
if (err < 0)
return err;
if (content_ref) {
// Create our own reference out of the user-supplied one.
content_ref = ff_refstruct_ref(content_ref);
}
unit = &frag->units[position];
unit->type = type;
unit->content = content;
unit->content_ref = content_ref;
return 0;
}
static int cbs_insert_unit_data(CodedBitstreamFragment *frag,
CodedBitstreamUnitType type,
uint8_t *data, size_t data_size,
AVBufferRef *data_buf,
int position)
{
CodedBitstreamUnit *unit;
AVBufferRef *data_ref;
int err;
av_assert0(position >= 0 && position <= frag->nb_units);
if (data_buf)
data_ref = av_buffer_ref(data_buf);
else
data_ref = av_buffer_create(data, data_size, NULL, NULL, 0);
if (!data_ref) {
if (!data_buf)
av_free(data);
return AVERROR(ENOMEM);
}
err = cbs_insert_unit(frag, position);
if (err < 0) {
av_buffer_unref(&data_ref);
return err;
}
unit = &frag->units[position];
unit->type = type;
unit->data = data;
unit->data_size = data_size;
unit->data_ref = data_ref;
return 0;
}
int ff_cbs_append_unit_data(CodedBitstreamFragment *frag,
CodedBitstreamUnitType type,
uint8_t *data, size_t data_size,
AVBufferRef *data_buf)
{
return cbs_insert_unit_data(frag, type,
data, data_size, data_buf,
frag->nb_units);
}
void ff_cbs_delete_unit(CodedBitstreamFragment *frag,
int position)
{
av_assert0(0 <= position && position < frag->nb_units
&& "Unit to be deleted not in fragment.");
cbs_unit_uninit(&frag->units[position]);
--frag->nb_units;
if (frag->nb_units > 0)
memmove(frag->units + position,
frag->units + position + 1,
(frag->nb_units - position) * sizeof(*frag->units));
}
static void cbs_default_free_unit_content(FFRefStructOpaque opaque, void *content)
{
const CodedBitstreamUnitTypeDescriptor *desc = opaque.c;
for (int i = 0; i < desc->type.ref.nb_offsets; i++) {
void **ptr = (void**)((char*)content + desc->type.ref.offsets[i]);
av_buffer_unref((AVBufferRef**)(ptr + 1));
}
}
static const CodedBitstreamUnitTypeDescriptor
*cbs_find_unit_type_desc(CodedBitstreamContext *ctx,
CodedBitstreamUnit *unit)
{
const CodedBitstreamUnitTypeDescriptor *desc;
int i, j;
if (!ctx->codec->unit_types)
return NULL;
for (i = 0;; i++) {
desc = &ctx->codec->unit_types[i];
if (desc->nb_unit_types == 0)
break;
if (desc->nb_unit_types == CBS_UNIT_TYPE_RANGE) {
if (unit->type >= desc->unit_type.range.start &&
unit->type <= desc->unit_type.range.end)
return desc;
} else {
for (j = 0; j < desc->nb_unit_types; j++) {
if (desc->unit_type.list[j] == unit->type)
return desc;
}
}
}
return NULL;
}
static void *cbs_alloc_content(const CodedBitstreamUnitTypeDescriptor *desc)
{
return ff_refstruct_alloc_ext_c(desc->content_size, 0,
(FFRefStructOpaque){ .c = desc },
desc->content_type == CBS_CONTENT_TYPE_COMPLEX
? desc->type.complex.content_free
: cbs_default_free_unit_content);
}
int ff_cbs_alloc_unit_content(CodedBitstreamContext *ctx,
CodedBitstreamUnit *unit)
{
const CodedBitstreamUnitTypeDescriptor *desc;
av_assert0(!unit->content && !unit->content_ref);
desc = cbs_find_unit_type_desc(ctx, unit);
if (!desc)
return AVERROR(ENOSYS);
unit->content_ref = cbs_alloc_content(desc);
if (!unit->content_ref)
return AVERROR(ENOMEM);
unit->content = unit->content_ref;
return 0;
}
static int cbs_clone_noncomplex_unit_content(void **clonep,
const CodedBitstreamUnit *unit,
const CodedBitstreamUnitTypeDescriptor *desc)
{
const uint8_t *src;
uint8_t *copy;
int err, i;
av_assert0(unit->content);
src = unit->content;
copy = cbs_alloc_content(desc);
if (!copy)
return AVERROR(ENOMEM);
memcpy(copy, src, desc->content_size);
for (int i = 0; i < desc->type.ref.nb_offsets; i++) {
void **ptr = (void**)(copy + desc->type.ref.offsets[i]);
/* Zero all the AVBufferRefs as they are owned by src. */
*(ptr + 1) = NULL;
}
for (i = 0; i < desc->type.ref.nb_offsets; i++) {
const uint8_t *const *src_ptr = (const uint8_t* const*)(src + desc->type.ref.offsets[i]);
const AVBufferRef *src_buf = *(AVBufferRef**)(src_ptr + 1);
uint8_t **copy_ptr = (uint8_t**)(copy + desc->type.ref.offsets[i]);
AVBufferRef **copy_buf = (AVBufferRef**)(copy_ptr + 1);
if (!*src_ptr) {
av_assert0(!src_buf);
continue;
}
if (!src_buf) {
// We can't handle a non-refcounted pointer here - we don't
// have enough information to handle whatever structure lies
// at the other end of it.
err = AVERROR(EINVAL);
goto fail;
}
*copy_buf = av_buffer_ref(src_buf);
if (!*copy_buf) {
err = AVERROR(ENOMEM);
goto fail;
}
}
*clonep = copy;
return 0;
fail:
ff_refstruct_unref(&copy);
return err;
}
/*
* On success, unit->content and unit->content_ref are updated with
* the new content; unit is untouched on failure.
* Any old content_ref is simply overwritten and not freed.
*/
static int cbs_clone_unit_content(CodedBitstreamContext *ctx,
CodedBitstreamUnit *unit)
{
const CodedBitstreamUnitTypeDescriptor *desc;
void *new_content;
int err;
desc = cbs_find_unit_type_desc(ctx, unit);
if (!desc)
return AVERROR(ENOSYS);
switch (desc->content_type) {
case CBS_CONTENT_TYPE_INTERNAL_REFS:
err = cbs_clone_noncomplex_unit_content(&new_content, unit, desc);
break;
case CBS_CONTENT_TYPE_COMPLEX:
if (!desc->type.complex.content_clone)
return AVERROR_PATCHWELCOME;
err = desc->type.complex.content_clone(&new_content, unit);
break;
default:
av_assert0(0 && "Invalid content type.");
}
if (err < 0)
return err;
unit->content_ref = new_content;
unit->content = new_content;
return 0;
}
int ff_cbs_make_unit_refcounted(CodedBitstreamContext *ctx,
CodedBitstreamUnit *unit)
{
av_assert0(unit->content);
if (unit->content_ref)
return 0;
return cbs_clone_unit_content(ctx, unit);
}
int ff_cbs_make_unit_writable(CodedBitstreamContext *ctx,
CodedBitstreamUnit *unit)
{
void *ref = unit->content_ref;
int err;
av_assert0(unit->content);
if (ref && ff_refstruct_exclusive(ref))
return 0;
err = cbs_clone_unit_content(ctx, unit);
if (err < 0)
return err;
ff_refstruct_unref(&ref);
return 0;
}
void ff_cbs_discard_units(CodedBitstreamContext *ctx,
CodedBitstreamFragment *frag,
enum AVDiscard skip,
int flags)
{
if (!ctx->codec->discarded_unit)
return;
for (int i = frag->nb_units - 1; i >= 0; i--) {
if (ctx->codec->discarded_unit(ctx, &frag->units[i], skip)) {
// discard all units
if (!(flags & DISCARD_FLAG_KEEP_NON_VCL)) {
ff_cbs_fragment_free(frag);
return;
}
ff_cbs_delete_unit(frag, i);
}
}
}
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