Quelle atsc_a53.h Sprache: C

/*
* 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
*/

#ifndef AVCODEC_ATSC_A53_H
#define AVCODEC_ATSC_A53_H

#include <stddef.h>
#include <stdint.h>

#include "libavutil/buffer.h"
#include "libavutil/frame.h"

/**
* Check AVFrame for A53 side data and allocate and fill SEI message with A53 info
*
* @param frame      Raw frame to get A53 side data from
* @param prefix_len Number of bytes to allocate before SEI message
* @param data       Pointer to a variable to store allocated memory
*                   Upon return the variable will hold NULL on error or if frame has no A53 info.
*                   Otherwise it will point to prefix_len uninitialized bytes followed by
*                   *sei_size SEI message
* @param sei_size   Pointer to a variable to store generated SEI message length
* @return           Zero on success, negative error code on failure
*/
int ff_alloc_a53_sei(const AVFrame *frame, size_t prefix_len,
                     void **data, size_t *sei_size);

/**
* Parse a data array for ATSC A53 Part 4 Closed Captions and store them in an AVBufferRef.
*
* @param pbuf Pointer to an AVBufferRef to append the closed captions. *pbuf may be NULL, in
*             which case a new buffer will be allocated and put in it.
* @param data The data array containing the raw A53 data.
* @param size Size of the data array in bytes.
*
* @return Number of closed captions parsed on success, negative error code on failure.
*         If no Closed Captions are parsed, *pbuf is untouched.
*/
int ff_parse_a53_cc(AVBufferRef **pbuf, const uint8_t *data, int size);

#endif /* AVCODEC_ATSC_A53_H */

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