text: /*
   * 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 */
  