media/ffvpx/libavcodec/atsc_a53.h

   1 /*
   2  * This file is part of FFmpeg.
   3  *
   4  * FFmpeg is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * FFmpeg is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with FFmpeg; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 #ifndef AVCODEC_ATSC_A53_H
  20 #define AVCODEC_ATSC_A53_H
  21
  22 #include <stddef.h>
  23 #include <stdint.h>
  24
  25 #include "libavutil/buffer.h"
  26 #include "libavutil/frame.h"
  27
  28 /**
  29  * Check AVFrame for A53 side data and allocate and fill SEI message with A53 info
  30  *
  31  * @param frame      Raw frame to get A53 side data from
  32  * @param prefix_len Number of bytes to allocate before SEI message
  33  * @param data       Pointer to a variable to store allocated memory
  34  *                   Upon return the variable will hold NULL on error or if frame has no A53 info.
  35  *                   Otherwise it will point to prefix_len uninitialized bytes followed by
  36  *                   *sei_size SEI message
  37  * @param sei_size   Pointer to a variable to store generated SEI message length
  38  * @return           Zero on success, negative error code on failure
  39  */
  40 int ff_alloc_a53_sei(const AVFrame *frame, size_t prefix_len,
  41                      void **data, size_t *sei_size);
  42
  43 /**
  44  * Parse a data array for ATSC A53 Part 4 Closed Captions and store them in an AVBufferRef.
  45  *
  46  * @param pbuf Pointer to an AVBufferRef to append the closed captions. *pbuf may be NULL, in
  47  *             which case a new buffer will be allocated and put in it.
  48  * @param data The data array containing the raw A53 data.
  49  * @param size Size of the data array in bytes.
  50  *
  51  * @return Number of closed captions parsed on success, negative error code on failure.
  52  *         If no Closed Captions are parsed, *pbuf is untouched.
  53  */
  54 int ff_parse_a53_cc(AVBufferRef **pbuf, const uint8_t *data, int size);
  55
  56 #endif /* AVCODEC_ATSC_A53_H */