mirror of https://git.ffmpeg.org/ffmpeg.git
202 lines
6.9 KiB
C
202 lines
6.9 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_CBS_SEI_H
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#define AVCODEC_CBS_SEI_H
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#include <stddef.h>
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#include <stdint.h>
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#include "cbs.h"
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#include "sei.h"
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typedef struct SEIRawFillerPayload {
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uint32_t payload_size;
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} SEIRawFillerPayload;
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typedef struct SEIRawUserDataRegistered {
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uint8_t itu_t_t35_country_code;
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uint8_t itu_t_t35_country_code_extension_byte;
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uint8_t *data; ///< RefStruct reference
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size_t data_length;
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} SEIRawUserDataRegistered;
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typedef struct SEIRawUserDataUnregistered {
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uint8_t uuid_iso_iec_11578[16];
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uint8_t *data; ///< RefStruct reference
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size_t data_length;
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} SEIRawUserDataUnregistered;
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typedef struct SEIRawMasteringDisplayColourVolume {
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uint16_t display_primaries_x[3];
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uint16_t display_primaries_y[3];
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uint16_t white_point_x;
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uint16_t white_point_y;
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uint32_t max_display_mastering_luminance;
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uint32_t min_display_mastering_luminance;
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} SEIRawMasteringDisplayColourVolume;
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typedef struct SEIRawContentLightLevelInfo {
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uint16_t max_content_light_level;
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uint16_t max_pic_average_light_level;
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} SEIRawContentLightLevelInfo;
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typedef struct SEIRawAlternativeTransferCharacteristics {
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uint8_t preferred_transfer_characteristics;
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} SEIRawAlternativeTransferCharacteristics;
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typedef struct SEIRawAmbientViewingEnvironment {
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uint32_t ambient_illuminance;
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uint16_t ambient_light_x;
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uint16_t ambient_light_y;
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} SEIRawAmbientViewingEnvironment;
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typedef struct SEIRawMessage {
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uint32_t payload_type;
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uint32_t payload_size;
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void *payload;
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void *payload_ref; ///< RefStruct reference
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uint8_t *extension_data; ///< RefStruct reference
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size_t extension_bit_length;
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} SEIRawMessage;
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typedef struct SEIRawMessageList {
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SEIRawMessage *messages;
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int nb_messages;
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int nb_messages_allocated;
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} SEIRawMessageList;
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typedef struct SEIMessageState {
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// The type of the payload being written.
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uint32_t payload_type;
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// When reading, contains the size of the payload to allow finding the
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// end of variable-length fields (such as user_data_payload_byte[]).
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// (When writing, the size will be derived from the total number of
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// bytes actually written.)
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uint32_t payload_size;
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// When writing, indicates that payload extension data is present so
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// all extended fields must be written. May be updated by the writer
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// to indicate that extended fields have been written, so the extension
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// end bits must be written too.
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uint8_t extension_present;
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} SEIMessageState;
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struct GetBitContext;
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struct PutBitContext;
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typedef int (*SEIMessageReadFunction)(CodedBitstreamContext *ctx,
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struct GetBitContext *rw,
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void *current,
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SEIMessageState *sei);
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typedef int (*SEIMessageWriteFunction)(CodedBitstreamContext *ctx,
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struct PutBitContext *rw,
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void *current,
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SEIMessageState *sei);
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typedef struct SEIMessageTypeDescriptor {
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// Payload type for the message. (-1 in this field ends a list.)
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int type;
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// Valid in a prefix SEI NAL unit (always for H.264).
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uint8_t prefix;
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// Valid in a suffix SEI NAL unit (never for H.264).
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uint8_t suffix;
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// Size of the decomposed structure.
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size_t size;
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// Read bitstream into SEI message.
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SEIMessageReadFunction read;
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// Write bitstream from SEI message.
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SEIMessageWriteFunction write;
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} SEIMessageTypeDescriptor;
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// Macro for the read/write pair. The clumsy cast is needed because the
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// current pointer is typed in all of the read/write functions but has to
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// be void here to fit all cases.
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#define SEI_MESSAGE_RW(codec, name) \
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.read = (SEIMessageReadFunction) cbs_ ## codec ## _read_ ## name, \
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.write = (SEIMessageWriteFunction)cbs_ ## codec ## _write_ ## name
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// End-of-list sentinel element.
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#define SEI_MESSAGE_TYPE_END { .type = -1 }
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/**
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* Find the type descriptor for the given payload type.
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*
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* Returns NULL if the payload type is not known.
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*/
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const SEIMessageTypeDescriptor *ff_cbs_sei_find_type(CodedBitstreamContext *ctx,
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int payload_type);
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/**
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* Allocate a new payload for the given SEI message.
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*/
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int ff_cbs_sei_alloc_message_payload(SEIRawMessage *message,
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const SEIMessageTypeDescriptor *desc);
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/**
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* Allocate a new empty SEI message in a message list.
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*
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* The new message is in place nb_messages - 1.
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*/
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int ff_cbs_sei_list_add(SEIRawMessageList *list);
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/**
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* Free all SEI messages in a message list.
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*/
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void ff_cbs_sei_free_message_list(SEIRawMessageList *list);
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/**
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* Add an SEI message to an access unit.
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*
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* Will add to an existing SEI NAL unit, or create a new one for the
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* message if there is no suitable existing one.
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*
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* If set, payload_ref must be a RefStruct reference backing payload_data.
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* This function creates a new reference to payload_ref in this case.
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* If payload_ref is NULL, the new message will not be reference counted.
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*/
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int ff_cbs_sei_add_message(CodedBitstreamContext *ctx,
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CodedBitstreamFragment *au,
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int prefix,
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uint32_t payload_type,
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void *payload_data,
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void *payload_ref);
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/**
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* Iterate over messages with the given payload type in an access unit.
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*
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* Set message to NULL in the first call. Returns 0 while more messages
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* are available, AVERROR(ENOENT) when all messages have been found.
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*/
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int ff_cbs_sei_find_message(CodedBitstreamContext *ctx,
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CodedBitstreamFragment *au,
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uint32_t payload_type,
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SEIRawMessage **message);
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/**
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* Delete all messages with the given payload type from an access unit.
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*/
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void ff_cbs_sei_delete_message_type(CodedBitstreamContext *ctx,
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CodedBitstreamFragment *au,
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uint32_t payload_type);
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#endif /* AVCODEC_CBS_SEI_H */
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