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ffmpeg/libavcodec/cbs_sei.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h 
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

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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 "libavutil/mem.h"
#include "cbs.h"
#include "cbs_internal.h"
#include "cbs_h264.h"
#include "cbs_h265.h"
#include "cbs_h266.h"
#include "cbs_sei.h"
#include "refstruct.h"
static void cbs_free_user_data_registered(FFRefStructOpaque unused, void *obj)
{
SEIRawUserDataRegistered *udr = obj;
ff_refstruct_unref(&udr->data);
}
static void cbs_free_user_data_unregistered(FFRefStructOpaque unused, void *obj)
{
SEIRawUserDataUnregistered *udu = obj;
ff_refstruct_unref(&udu->data);
}
int ff_cbs_sei_alloc_message_payload(SEIRawMessage *message,
const SEIMessageTypeDescriptor *desc)
{
void (*free_func)(FFRefStructOpaque, void*);
unsigned flags = 0;
av_assert0(message->payload == NULL &&
message->payload_ref == NULL);
message->payload_type = desc->type;
if (desc->type == SEI_TYPE_USER_DATA_REGISTERED_ITU_T_T35)
free_func = &cbs_free_user_data_registered;
else if (desc->type == SEI_TYPE_USER_DATA_UNREGISTERED)
free_func = &cbs_free_user_data_unregistered;
else {
free_func = NULL;
flags = FF_REFSTRUCT_FLAG_NO_ZEROING;
}
message->payload_ref = ff_refstruct_alloc_ext(desc->size, flags,
NULL, free_func);
if (!message->payload_ref)
return AVERROR(ENOMEM);
message->payload = message->payload_ref;
return 0;
}
int ff_cbs_sei_list_add(SEIRawMessageList *list)
{
void *ptr;
int old_count = list->nb_messages_allocated;
av_assert0(list->nb_messages <= old_count);
if (list->nb_messages + 1 > old_count) {
int new_count = 2 * old_count + 1;
ptr = av_realloc_array(list->messages,
new_count, sizeof(*list->messages));
if (!ptr)
return AVERROR(ENOMEM);
list->messages = ptr;
list->nb_messages_allocated = new_count;
// Zero the newly-added entries.
memset(list->messages + old_count, 0,
(new_count - old_count) * sizeof(*list->messages));
}
++list->nb_messages;
return 0;
}
void ff_cbs_sei_free_message_list(SEIRawMessageList *list)
{
for (int i = 0; i < list->nb_messages; i++) {
SEIRawMessage *message = &list->messages[i];
ff_refstruct_unref(&message->payload_ref);
ff_refstruct_unref(&message->extension_data);
}
av_free(list->messages);
}
static int cbs_sei_get_unit(CodedBitstreamContext *ctx,
CodedBitstreamFragment *au,
int prefix,
CodedBitstreamUnit **sei_unit)
{
CodedBitstreamUnit *unit;
int sei_type, highest_vcl_type, err, i, position;
switch (ctx->codec->codec_id) {
case AV_CODEC_ID_H264:
// (We can ignore auxiliary slices because we only have prefix
// SEI in H.264 and an auxiliary picture must always follow a
// primary picture.)
highest_vcl_type = H264_NAL_IDR_SLICE;
if (prefix)
sei_type = H264_NAL_SEI;
else
return AVERROR(EINVAL);
break;
case AV_CODEC_ID_H265:
highest_vcl_type = HEVC_NAL_RSV_VCL31;
if (prefix)
sei_type = HEVC_NAL_SEI_PREFIX;
else
sei_type = HEVC_NAL_SEI_SUFFIX;
break;
case AV_CODEC_ID_H266:
highest_vcl_type = VVC_RSV_IRAP_11;
if (prefix)
sei_type = VVC_PREFIX_SEI_NUT;
else
sei_type = VVC_SUFFIX_SEI_NUT;
break;
default:
return AVERROR(EINVAL);
}
// Find an existing SEI NAL unit of the right type.
unit = NULL;
for (i = 0; i < au->nb_units; i++) {
if (au->units[i].type == sei_type) {
unit = &au->units[i];
break;
}
}
if (unit) {
*sei_unit = unit;
return 0;
}
// Need to add a new SEI NAL unit ...
if (prefix) {
// ... before the first VCL NAL unit.
for (i = 0; i < au->nb_units; i++) {
if (au->units[i].type < highest_vcl_type)
break;
}
position = i;
} else {
// ... after the last VCL NAL unit.
for (i = au->nb_units - 1; i >= 0; i--) {
if (au->units[i].type < highest_vcl_type)
break;
}
if (i < 0) {
// No VCL units; just put it at the end.
position = au->nb_units;
} else {
position = i + 1;
}
}
err = ff_cbs_insert_unit_content(au, position, sei_type,
NULL, NULL);
if (err < 0)
return err;
unit = &au->units[position];
unit->type = sei_type;
err = ff_cbs_alloc_unit_content(ctx, unit);
if (err < 0)
return err;
switch (ctx->codec->codec_id) {
case AV_CODEC_ID_H264:
{
H264RawSEI sei = {
.nal_unit_header = {
.nal_ref_idc = 0,
.nal_unit_type = sei_type,
},
};
memcpy(unit->content, &sei, sizeof(sei));
}
break;
case AV_CODEC_ID_H265:
{
H265RawSEI sei = {
.nal_unit_header = {
.nal_unit_type = sei_type,
.nuh_layer_id = 0,
.nuh_temporal_id_plus1 = 1,
},
};
memcpy(unit->content, &sei, sizeof(sei));
}
break;
case AV_CODEC_ID_H266:
{
H266RawSEI sei = {
.nal_unit_header = {
.nal_unit_type = sei_type,
.nuh_layer_id = 0,
.nuh_temporal_id_plus1 = 1,
},
};
memcpy(unit->content, &sei, sizeof(sei));
}
break;
default:
av_assert0(0);
}
*sei_unit = unit;
return 0;
}
static int cbs_sei_get_message_list(CodedBitstreamContext *ctx,
CodedBitstreamUnit *unit,
SEIRawMessageList **list)
{
switch (ctx->codec->codec_id) {
case AV_CODEC_ID_H264:
{
H264RawSEI *sei = unit->content;
if (unit->type != H264_NAL_SEI)
return AVERROR(EINVAL);
*list = &sei->message_list;
}
break;
case AV_CODEC_ID_H265:
{
H265RawSEI *sei = unit->content;
if (unit->type != HEVC_NAL_SEI_PREFIX &&
unit->type != HEVC_NAL_SEI_SUFFIX)
return AVERROR(EINVAL);
*list = &sei->message_list;
}
break;
case AV_CODEC_ID_H266:
{
H266RawSEI *sei = unit->content;
if (unit->type != VVC_PREFIX_SEI_NUT &&
unit->type != VVC_SUFFIX_SEI_NUT)
return AVERROR(EINVAL);
*list = &sei->message_list;
}
break;
default:
return AVERROR(EINVAL);
}
return 0;
}
int ff_cbs_sei_add_message(CodedBitstreamContext *ctx,
CodedBitstreamFragment *au,
int prefix,
uint32_t payload_type,
void *payload_data,
void *payload_ref)
{
const SEIMessageTypeDescriptor *desc;
CodedBitstreamUnit *unit;
SEIRawMessageList *list;
SEIRawMessage *message;
int err;
desc = ff_cbs_sei_find_type(ctx, payload_type);
if (!desc)
return AVERROR(EINVAL);
// Find an existing SEI unit or make a new one to add to.
err = cbs_sei_get_unit(ctx, au, prefix, &unit);
if (err < 0)
return err;
// Find the message list inside the codec-dependent unit.
err = cbs_sei_get_message_list(ctx, unit, &list);
if (err < 0)
return err;
// Add a new message to the message list.
err = ff_cbs_sei_list_add(list);
if (err < 0)
return err;
if (payload_ref) {
/* The following just increments payload_ref's refcount,
* so that payload_ref is now owned by us. */
payload_ref = ff_refstruct_ref(payload_ref);
}
message = &list->messages[list->nb_messages - 1];
message->payload_type = payload_type;
message->payload = payload_data;
message->payload_ref = payload_ref;
return 0;
}
int ff_cbs_sei_find_message(CodedBitstreamContext *ctx,
CodedBitstreamFragment *au,
uint32_t payload_type,
SEIRawMessage **iter)
{
int err, i, j, found;
found = 0;
for (i = 0; i < au->nb_units; i++) {
CodedBitstreamUnit *unit = &au->units[i];
SEIRawMessageList *list;
err = cbs_sei_get_message_list(ctx, unit, &list);
if (err < 0)
continue;
for (j = 0; j < list->nb_messages; j++) {
SEIRawMessage *message = &list->messages[j];
if (message->payload_type == payload_type) {
if (!*iter || found) {
*iter = message;
return 0;
}
if (message == *iter)
found = 1;
}
}
}
return AVERROR(ENOENT);
}
static void cbs_sei_delete_message(SEIRawMessageList *list,
int position)
{
SEIRawMessage *message;
av_assert0(0 <= position && position < list->nb_messages);
message = &list->messages[position];
ff_refstruct_unref(&message->payload_ref);
ff_refstruct_unref(&message->extension_data);
--list->nb_messages;
if (list->nb_messages > 0) {
memmove(list->messages + position,
list->messages + position + 1,
(list->nb_messages - position) * sizeof(*list->messages));
}
}
void ff_cbs_sei_delete_message_type(CodedBitstreamContext *ctx,
CodedBitstreamFragment *au,
uint32_t payload_type)
{
int err, i, j;
for (i = 0; i < au->nb_units; i++) {
CodedBitstreamUnit *unit = &au->units[i];
SEIRawMessageList *list;
err = cbs_sei_get_message_list(ctx, unit, &list);
if (err < 0)
continue;
for (j = list->nb_messages - 1; j >= 0; j--) {
if (list->messages[j].payload_type == payload_type)
cbs_sei_delete_message(list, j);
}
}
}
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