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_VLC_H 20 #define AVCODEC_VLC_H 21 22 #include <stdint.h> 23 24 #define VLC_TYPE int16_t 25 26 typedef struct VLC { 27 int bits; 28 VLC_TYPE (*table)[2]; ///< code, bits 29 int table_size, table_allocated; 30 } VLC; 31 32 typedef struct RL_VLC_ELEM { 33 int16_t level; 34 int8_t len; 35 uint8_t run; 36 } RL_VLC_ELEM; 37 38 #define init_vlc(vlc, nb_bits, nb_codes, \ 39 bits, bits_wrap, bits_size, \ 40 codes, codes_wrap, codes_size, \ 41 flags) \ 42 ff_init_vlc_sparse(vlc, nb_bits, nb_codes, \ 43 bits, bits_wrap, bits_size, \ 44 codes, codes_wrap, codes_size, \ 45 NULL, 0, 0, flags) 46 47 int ff_init_vlc_sparse(VLC *vlc, int nb_bits, int nb_codes, 48 const void *bits, int bits_wrap, int bits_size, 49 const void *codes, int codes_wrap, int codes_size, 50 const void *symbols, int symbols_wrap, int symbols_size, 51 int flags); 52 void ff_free_vlc(VLC *vlc); 53 54 #define INIT_VLC_LE 2 55 #define INIT_VLC_USE_NEW_STATIC 4 56 57 #define INIT_VLC_SPARSE_STATIC(vlc, bits, a, b, c, d, e, f, g, h, i, j, static_size) \ 58 do { \ 59 static VLC_TYPE table[static_size][2]; \ 60 (vlc)->table = table; \ 61 (vlc)->table_allocated = static_size; \ 62 ff_init_vlc_sparse(vlc, bits, a, b, c, d, e, f, g, h, i, j, \ 63 INIT_VLC_USE_NEW_STATIC); \ 64 } while (0) 65 66 #define INIT_LE_VLC_SPARSE_STATIC(vlc, bits, a, b, c, d, e, f, g, h, i, j, static_size) \ 67 do { \ 68 static VLC_TYPE table[static_size][2]; \ 69 (vlc)->table = table; \ 70 (vlc)->table_allocated = static_size; \ 71 ff_init_vlc_sparse(vlc, bits, a, b, c, d, e, f, g, h, i, j, \ 72 INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE); \ 73 } while (0) 74 75 #define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size) \ 76 INIT_VLC_SPARSE_STATIC(vlc, bits, a, b, c, d, e, f, g, NULL, 0, 0, static_size) 77 78 #define INIT_LE_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size) \ 79 INIT_LE_VLC_SPARSE_STATIC(vlc, bits, a, b, c, d, e, f, g, NULL, 0, 0, static_size) 80 81 #endif /* AVCODEC_VLC_H */ 82