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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
* 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 <stddef.h>
#include <stdint.h>
#include "libavutil/buffer.h"
#include "cbs.h"
#include "sei.h"
typedef struct SEIRawFillerPayload {
uint32_t payload_size;
} SEIRawFillerPayload;
typedef struct SEIRawUserDataRegistered {
uint8_t itu_t_t35_country_code;
uint8_t itu_t_t35_country_code_extension_byte;
uint8_t *data;
AVBufferRef *data_ref;
size_t data_length;
} SEIRawUserDataRegistered;
typedef struct SEIRawUserDataUnregistered {
uint8_t uuid_iso_iec_11578[16];
uint8_t *data;
AVBufferRef *data_ref;
size_t data_length;
} SEIRawUserDataUnregistered;
typedef struct SEIRawMasteringDisplayColourVolume {
uint16_t display_primaries_x[3];
uint16_t display_primaries_y[3];
uint16_t white_point_x;
uint16_t white_point_y;
uint32_t max_display_mastering_luminance;
uint32_t min_display_mastering_luminance;
} SEIRawMasteringDisplayColourVolume;
typedef struct SEIRawContentLightLevelInfo {
uint16_t max_content_light_level;
uint16_t max_pic_average_light_level;
} SEIRawContentLightLevelInfo;
typedef struct SEIRawAlternativeTransferCharacteristics {
uint8_t preferred_transfer_characteristics;
} SEIRawAlternativeTransferCharacteristics;
typedef struct SEIRawMessage {
uint32_t payload_type;
uint32_t payload_size;
void *payload;
AVBufferRef *payload_ref;
uint8_t *extension_data;
AVBufferRef *extension_data_ref;
size_t extension_bit_length;
} SEIRawMessage;
typedef struct SEIRawMessageList {
SEIRawMessage *messages;
int nb_messages;
int nb_messages_allocated;
} SEIRawMessageList;
typedef struct SEIMessageState {
// The type of the payload being written.
uint32_t payload_type;
// When reading, contains the size of the payload to allow finding the
// end of variable-length fields (such as user_data_payload_byte[]).
// (When writing, the size will be derived from the total number of
// bytes actually written.)
uint32_t payload_size;
// When writing, indicates that payload extension data is present so
// all extended fields must be written. May be updated by the writer
// to indicate that extended fields have been written, so the extension
// end bits must be written too.
uint8_t extension_present;
} SEIMessageState;
struct GetBitContext;
struct PutBitContext;
typedef int (*SEIMessageReadFunction)(CodedBitstreamContext *ctx,
struct GetBitContext *rw,
void *current,
SEIMessageState *sei);
typedef int (*SEIMessageWriteFunction)(CodedBitstreamContext *ctx,
struct PutBitContext *rw,
void *current,
SEIMessageState *sei);
typedef struct SEIMessageTypeDescriptor {
// Payload type for the message. (-1 in this field ends a list.)
int type;
// Valid in a prefix SEI NAL unit (always for H.264).
uint8_t prefix;
// Valid in a suffix SEI NAL unit (never for H.264).
uint8_t suffix;
// Size of the decomposed structure.
size_t size;
// Read bitstream into SEI message.
SEIMessageReadFunction read;
// Write bitstream from SEI message.
SEIMessageWriteFunction write;
} SEIMessageTypeDescriptor;
// Macro for the read/write pair. The clumsy cast is needed because the
// current pointer is typed in all of the read/write functions but has to
// be void here to fit all cases.
#define SEI_MESSAGE_RW(codec, name) \
.read = (SEIMessageReadFunction) cbs_ ## codec ## _read_ ## name, \
.write = (SEIMessageWriteFunction)cbs_ ## codec ## _write_ ## name
// End-of-list sentinel element.
#define SEI_MESSAGE_TYPE_END { .type = -1 }
* Find the type descriptor for the given payload type.
* Returns NULL if the payload type is not known.
const SEIMessageTypeDescriptor *ff_cbs_sei_find_type(CodedBitstreamContext *ctx,
int payload_type);
* Allocate a new payload for the given SEI message.
int ff_cbs_sei_alloc_message_payload(SEIRawMessage *message,
const SEIMessageTypeDescriptor *desc);
* Allocate a new empty SEI message in a message list.
* The new message is in place nb_messages - 1.
int ff_cbs_sei_list_add(SEIRawMessageList *list);
* Free all SEI messages in a message list.
void ff_cbs_sei_free_message_list(SEIRawMessageList *list);
* Add an SEI message to an access unit.
* Will add to an existing SEI NAL unit, or create a new one for the
* message if there is no suitable existing one.
* Takes a new reference to payload_buf, if set. If payload_buf is
* NULL then the new message will not be reference counted.
int ff_cbs_sei_add_message(CodedBitstreamContext *ctx,
CodedBitstreamFragment *au,
int prefix,
uint32_t payload_type,
void *payload_data,
AVBufferRef *payload_buf);
* Iterate over messages with the given payload type in an access unit.
* Set message to NULL in the first call. Returns 0 while more messages
* are available, AVERROR(ENOENT) when all messages have been found.
int ff_cbs_sei_find_message(CodedBitstreamContext *ctx,
CodedBitstreamFragment *au,
uint32_t payload_type,
SEIRawMessage **message);
* Delete all messages with the given payload type from an access unit.
void ff_cbs_sei_delete_message_type(CodedBitstreamContext *ctx,
CodedBitstreamFragment *au,
uint32_t payload_type);
#endif /* AVCODEC_CBS_SEI_H */