libavformat/hevc.h

   1 /*
   2  * Copyright (c) 2014 Tim Walker <tdskywalker@gmail.com>
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 /**
  22  * @file
  23  * internal header for HEVC (de)muxer utilities
  24  */
  25
  26 #ifndef AVFORMAT_HEVC_H
  27 #define AVFORMAT_HEVC_H
  28
  29 #include <stdint.h>
  30 #include "avio.h"
  31
  32 /**
  33  * Writes Annex B formatted HEVC NAL units to the provided AVIOContext.
  34  *
  35  * The NAL units are converted to an MP4-compatible format (start code prefixes
  36  * are replaced by 4-byte size fields, as per ISO/IEC 14496-15).
  37  *
  38  * If filter_ps is non-zero, any HEVC parameter sets found in the input will be
  39  * discarded, and *ps_count will be set to the number of discarded PS NAL units.
  40  *
  41  * @param pb address of the AVIOContext where the data shall be written
  42  * @param buf_in address of the buffer holding the input data
  43  * @param size size (in bytes) of the input buffer
  44  * @param filter_ps whether to write parameter set NAL units to the output (0)
  45  *        or to discard them (non-zero)
  46  * @param ps_count address of the variable where the number of discarded
  47  *        parameter set NAL units shall be written, may be NULL
  48  * @return the amount (in bytes) of data written in case of success, a negative
  49  *         value corresponding to an AVERROR code in case of failure
  50  */
  51 int ff_hevc_annexb2mp4(AVIOContext *pb, const uint8_t *buf_in,
  52                        int size, int filter_ps, int *ps_count);
  53
  54 /**
  55  * Writes Annex B formatted HEVC NAL units to a data buffer.
  56  *
  57  * The NAL units are converted to an MP4-compatible format (start code prefixes
  58  * are replaced by 4-byte size fields, as per ISO/IEC 14496-15).
  59  *
  60  * If filter_ps is non-zero, any HEVC parameter sets found in the input will be
  61  * discarded, and *ps_count will be set to the number of discarded PS NAL units.
  62  *
  63  * On success, *size holds the size (in bytes) of the output data buffer.
  64  *
  65  * @param buf_in address of the buffer holding the input data
  66  * @param size address of the variable holding the size (in bytes) of the input
  67  *        buffer (on input) and of the output buffer (on success)
  68  * @param buf_out on success, address of the variable holding the address of
  69  *        the output buffer
  70  * @param filter_ps whether to write parameter set NAL units to the output (0)
  71  *        or to discard them (non-zero)
  72  * @param ps_count address of the variable where the number of discarded
  73  *        parameter set NAL units shall be written, may be NULL
  74  * @return 0 in case of success, a negative value corresponding to an AVERROR
  75  *         code in case of failure
  76  * @note *buf_out will be treated as uninitialized on input and won't be freed.
  77  */
  78 int ff_hevc_annexb2mp4_buf(const uint8_t *buf_in, uint8_t **buf_out,
  79                            int *size, int filter_ps, int *ps_count);
  80
  81 /**
  82  * Writes HEVC extradata (parameter sets, declarative SEI NAL units) to the
  83  * provided AVIOContext.
  84  *
  85  * If the extradata is Annex B format, it gets converted to hvcC format before
  86  * writing.
  87  *
  88  * @param pb address of the AVIOContext where the hvcC shall be written
  89  * @param data address of the buffer holding the data needed to write the hvcC
  90  * @param size size (in bytes) of the data buffer
  91  * @param ps_array_completeness whether all parameter sets are in the hvcC (1)
  92  *        or there may be additional parameter sets in the bitstream (0)
  93  * @return >=0 in case of success, a negative value corresponding to an AVERROR
  94  *         code in case of failure
  95  */
  96 int ff_isom_write_hvcc(AVIOContext *pb, const uint8_t *data,
  97                        int size, int ps_array_completeness);
  98
  99 #endif /* AVFORMAT_HEVC_H */