modules/codec/hxxx_helper.h

   1 /*****************************************************************************
   2  * hxxx_helper.h: AnnexB / avcC helper for dumb decoders
   3  *****************************************************************************
   4  * Copyright (C) 2017 VLC authors and VideoLAN
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU Lesser General Public License as published by
   8  * the Free Software Foundation; either version 2.1 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program 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
  14  * GNU Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  19  *****************************************************************************/
  20
  21 #ifdef HAVE_CONFIG_H
  22 # include "config.h"
  23 #endif
  24
  25 #include <vlc_block.h>
  26 #include <vlc_fourcc.h>
  27
  28 #include "../packetizer/h264_nal.h"
  29 #include "../packetizer/hevc_nal.h"
  30
  31 struct hxxx_helper_nal
  32 {
  33     block_t *b;
  34     union {
  35         h264_sequence_parameter_set_t   *h264_sps;
  36         h264_picture_parameter_set_t    *h264_pps;
  37     };
  38 };
  39
  40 struct hxxx_helper
  41 {
  42     vlc_object_t *p_obj; /* for logs */
  43     vlc_fourcc_t i_codec;
  44     bool b_need_xvcC; /* Need avcC or hvcC */
  45
  46     bool b_is_xvcC;
  47     uint8_t i_nal_length_size;
  48     union {
  49         struct {
  50             struct hxxx_helper_nal sps_list[H264_SPS_ID_MAX + 1];
  51             struct hxxx_helper_nal pps_list[H264_PPS_ID_MAX + 1];
  52             uint8_t i_current_sps;
  53             uint8_t i_sps_count;
  54             uint8_t i_pps_count;
  55         } h264;
  56         struct {
  57             /* TODO: handle VPS/SPS/PPS */
  58             void *p_annexb_config_nal;
  59             size_t i_annexb_config_nal;
  60         } hevc;
  61     };
  62
  63     /* Process the block: do the AnnexB <-> xvcC conversion if needed. If
  64      * p_config_changed is not NULL, parse nals to detect a SPS/PPS or a video
  65      * size change. */
  66     block_t * (*pf_process_block)(struct hxxx_helper *hh, block_t *p_block,
  67                                   bool *p_config_changed);
  68 };
  69
  70 void hxxx_helper_init(struct hxxx_helper *hh, vlc_object_t *p_obj,
  71                       vlc_fourcc_t i_codec, bool b_need_xvcC);
  72 void hxxx_helper_clean(struct hxxx_helper *hh);
  73
  74 int hxxx_helper_set_extra(struct hxxx_helper *hh, const void *p_extra,
  75                           size_t i_extra);
  76
  77 block_t *h264_helper_get_annexb_config(struct hxxx_helper *hh);
  78
  79 block_t *h264_helper_get_avcc_config(struct hxxx_helper *hh);
  80
  81 int h264_helper_get_current_picture_size(struct hxxx_helper *hh,
  82                                          unsigned *p_w, unsigned *p_h,
  83                                          unsigned *p_vw, unsigned *p_vh);
  84
  85 int h264_helper_get_current_sar(struct hxxx_helper *hh, int *p_num, int *p_den);
  86
  87 int h264_helper_get_current_dpb_values(struct hxxx_helper *hh,
  88                                        uint8_t *p_depth, unsigned *pi_delay);