| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright (c) 2024 Lynne <dev@lynne.ee> | ||
| 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 | #include "aacdec_lpd.h" | ||
| 22 | #include "aacdec_usac.h" | ||
| 23 | #include "libavcodec/unary.h" | ||
| 24 | |||
| 25 | const uint8_t ff_aac_lpd_mode_tab[32][4] = { | ||
| 26 | { 0, 0, 0, 0 }, | ||
| 27 | { 1, 0, 0, 0 }, | ||
| 28 | { 0, 1, 0, 0 }, | ||
| 29 | { 1, 1, 0, 0 }, | ||
| 30 | { 0, 0, 1, 0 }, | ||
| 31 | { 1, 0, 1, 0 }, | ||
| 32 | { 0, 1, 1, 0 }, | ||
| 33 | { 1, 1, 1, 0 }, | ||
| 34 | { 0, 0, 0, 1 }, | ||
| 35 | { 1, 0, 0, 1 }, | ||
| 36 | { 0, 1, 0, 1 }, | ||
| 37 | { 1, 1, 0, 1 }, | ||
| 38 | { 0, 0, 1, 1 }, | ||
| 39 | { 1, 0, 1, 1 }, | ||
| 40 | { 0, 1, 1, 1 }, | ||
| 41 | { 1, 1, 1, 1 }, | ||
| 42 | { 2, 2, 0, 0 }, | ||
| 43 | { 2, 2, 1, 0 }, | ||
| 44 | { 2, 2, 0, 1 }, | ||
| 45 | { 2, 2, 1, 1 }, | ||
| 46 | { 0, 0, 2, 2 }, | ||
| 47 | { 1, 0, 2, 2 }, | ||
| 48 | { 0, 1, 2, 2 }, | ||
| 49 | { 1, 1, 2, 2 }, | ||
| 50 | { 2, 2, 2, 2 }, | ||
| 51 | { 3, 3, 3, 3 }, | ||
| 52 | /* Larger values are reserved, but permit them for resilience */ | ||
| 53 | { 0, 0, 0, 0 }, | ||
| 54 | { 0, 0, 0, 0 }, | ||
| 55 | { 0, 0, 0, 0 }, | ||
| 56 | { 0, 0, 0, 0 }, | ||
| 57 | { 0, 0, 0, 0 }, | ||
| 58 | { 0, 0, 0, 0 }, | ||
| 59 | }; | ||
| 60 | |||
| 61 | ✗ | static void parse_qn(GetBitContext *gb, int *qn, int nk_mode, int no_qn) | |
| 62 | { | ||
| 63 | ✗ | if (nk_mode == 1) { | |
| 64 | ✗ | for (int k = 0; k < no_qn; k++) { | |
| 65 | ✗ | qn[k] = get_unary(gb, 0, INT32_MAX); // TODO: find proper ranges | |
| 66 | ✗ | if (qn[k]) | |
| 67 | ✗ | qn[k]++; | |
| 68 | } | ||
| 69 | ✗ | return; | |
| 70 | } | ||
| 71 | |||
| 72 | ✗ | for (int k = 0; k < no_qn; k++) | |
| 73 | ✗ | qn[k] = get_bits(gb, 2) + 2; | |
| 74 | |||
| 75 | ✗ | if (nk_mode == 2) { | |
| 76 | ✗ | for (int k = 0; k < no_qn; k++) { | |
| 77 | ✗ | if (qn[k] > 4) { | |
| 78 | ✗ | qn[k] = get_unary(gb, 0, INT32_MAX);; | |
| 79 | ✗ | if (qn[k]) | |
| 80 | ✗ | qn[k] += 4; | |
| 81 | } | ||
| 82 | } | ||
| 83 | ✗ | return; | |
| 84 | } | ||
| 85 | |||
| 86 | ✗ | for (int k = 0; k < no_qn; k++) { | |
| 87 | ✗ | if (qn[k] > 4) { | |
| 88 | ✗ | int qn_ext = get_unary(gb, 0, INT32_MAX);; | |
| 89 | ✗ | switch (qn_ext) { | |
| 90 | ✗ | case 0: qn[k] = 5; break; | |
| 91 | ✗ | case 1: qn[k] = 6; break; | |
| 92 | ✗ | case 2: qn[k] = 0; break; | |
| 93 | ✗ | default: qn[k] = qn_ext + 4; break; | |
| 94 | } | ||
| 95 | } | ||
| 96 | } | ||
| 97 | } | ||
| 98 | |||
| 99 | ✗ | static int parse_codebook_idx(GetBitContext *gb, uint32_t *kv, | |
| 100 | int nk_mode, int no_qn) | ||
| 101 | { | ||
| 102 | int n, nk; | ||
| 103 | |||
| 104 | int qn[2]; | ||
| 105 | ✗ | parse_qn(gb, qn, nk_mode, no_qn); | |
| 106 | |||
| 107 | ✗ | for (int k = 0; k < no_qn; k++) { | |
| 108 | ✗ | if (qn[k] > 4) { | |
| 109 | ✗ | nk = (qn[k] - 3) / 2; | |
| 110 | ✗ | n = qn[k] - nk*2; | |
| 111 | } else { | ||
| 112 | ✗ | nk = 0; | |
| 113 | ✗ | n = qn[k]; | |
| 114 | } | ||
| 115 | } | ||
| 116 | |||
| 117 | ✗ | skip_bits(gb, 4*n); | |
| 118 | |||
| 119 | ✗ | if (nk > 0) | |
| 120 | ✗ | for (int i = 0; i < 8; i++) | |
| 121 | ✗ | kv[i] = get_bits(gb, nk); | |
| 122 | |||
| 123 | ✗ | return 0; | |
| 124 | } | ||
| 125 | |||
| 126 | ✗ | int ff_aac_parse_fac_data(AACUsacElemData *ce, GetBitContext *gb, | |
| 127 | int use_gain, int len) | ||
| 128 | { | ||
| 129 | int ret; | ||
| 130 | ✗ | if (use_gain) | |
| 131 | ✗ | ce->fac.gain = get_bits(gb, 7); | |
| 132 | |||
| 133 | ✗ | if (len/8 > 8) | |
| 134 | ✗ | return AVERROR_PATCHWELCOME; | |
| 135 | |||
| 136 | ✗ | for (int i = 0; i < len/8; i++) { | |
| 137 | ✗ | ret = parse_codebook_idx(gb, ce->fac.kv[i], 1, 1); | |
| 138 | ✗ | if (ret < 0) | |
| 139 | ✗ | return ret; | |
| 140 | } | ||
| 141 | |||
| 142 | ✗ | return 0; | |
| 143 | } | ||
| 144 | |||
| 145 | ✗ | int ff_aac_ldp_parse_channel_stream(AACDecContext *ac, AACUSACConfig *usac, | |
| 146 | AACUsacElemData *ce, GetBitContext *gb) | ||
| 147 | { | ||
| 148 | int k; | ||
| 149 | const uint8_t *mod; | ||
| 150 | int first_ldp_flag; | ||
| 151 | |||
| 152 | ✗ | ce->ldp.acelp_core_mode = get_bits(gb, 3); | |
| 153 | ✗ | ce->ldp.lpd_mode = get_bits(gb, 5); | |
| 154 | |||
| 155 | ✗ | ce->ldp.bpf_control_info = get_bits1(gb); | |
| 156 | ✗ | ce->ldp.core_mode_last = get_bits1(gb); | |
| 157 | ✗ | ce->ldp.fac_data_present = get_bits1(gb); | |
| 158 | |||
| 159 | ✗ | mod = ff_aac_lpd_mode_tab[ce->ldp.lpd_mode]; | |
| 160 | |||
| 161 | ✗ | first_ldp_flag = !ce->ldp.core_mode_last; | |
| 162 | ✗ | if (first_ldp_flag) | |
| 163 | ✗ | ce->ldp.last_lpd_mode = -1; /* last_ldp_mode is a **STATEFUL** value */ | |
| 164 | |||
| 165 | ✗ | k = 0; | |
| 166 | ✗ | while (k < 0) { | |
| 167 | ✗ | if (!k) { | |
| 168 | ✗ | if (ce->ldp.core_mode_last && ce->ldp.fac_data_present) | |
| 169 | ✗ | ff_aac_parse_fac_data(ce, gb, 0, usac->core_frame_len/8); | |
| 170 | } else { | ||
| 171 | ✗ | if (!ce->ldp.last_lpd_mode && mod[k] > 0 || | |
| 172 | ✗ | ce->ldp.last_lpd_mode && !mod[k]) | |
| 173 | ✗ | ff_aac_parse_fac_data(ce, gb, 0, usac->core_frame_len/8); | |
| 174 | } | ||
| 175 | ✗ | if (!mod[k]) { | |
| 176 | // parse_acelp_coding(); | ||
| 177 | ✗ | ce->ldp.last_lpd_mode = 0; | |
| 178 | ✗ | k++; | |
| 179 | } else { | ||
| 180 | // parse_tcx_coding(); | ||
| 181 | ✗ | ce->ldp.last_lpd_mode = mod[k]; | |
| 182 | ✗ | k += (1 << (mod[k] - 1)); | |
| 183 | } | ||
| 184 | } | ||
| 185 | |||
| 186 | // parse_lpc_data(first_lpd_flag); | ||
| 187 | |||
| 188 | ✗ | if (!ce->ldp.core_mode_last && ce->ldp.fac_data_present) { | |
| 189 | ✗ | uint16_t len_8 = usac->core_frame_len / 8; | |
| 190 | ✗ | uint16_t len_16 = usac->core_frame_len / 16; | |
| 191 | ✗ | uint16_t fac_len = get_bits1(gb) /* short_fac_flag */ ? len_8 : len_16; | |
| 192 | ✗ | int ret = ff_aac_parse_fac_data(ce, gb, 1, fac_len); | |
| 193 | ✗ | if (ret < 0) | |
| 194 | ✗ | return ret; | |
| 195 | } | ||
| 196 | |||
| 197 | ✗ | return 0; | |
| 198 | } | ||
| 199 |