| 1 | /* |
| 2 | * ATRAC3+ compatible decoder |
| 3 | * |
| 4 | * Copyright (c) 2010-2013 Maxim Poliakovski |
| 5 | * |
| 6 | * This file is part of FFmpeg. |
| 7 | * |
| 8 | * FFmpeg is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU Lesser General Public |
| 10 | * License as published by the Free Software Foundation; either |
| 11 | * version 2.1 of the License, or (at your option) any later version. |
| 12 | * |
| 13 | * FFmpeg is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | * Lesser General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU Lesser General Public |
| 19 | * License along with FFmpeg; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 21 | */ |
| 22 | |
| 23 | /** |
| 24 | * @file |
| 25 | * Bitstream parser for ATRAC3+ decoder. |
| 26 | */ |
| 27 | |
| 28 | #include "libavutil/avassert.h" |
| 29 | #include "avcodec.h" |
| 30 | #include "get_bits.h" |
| 31 | #include "atrac3plus.h" |
| 32 | #include "atrac3plus_data.h" |
| 33 | |
| 34 | static VLC_TYPE tables_data[154276][2]; |
| 35 | static VLC wl_vlc_tabs[4]; |
| 36 | static VLC sf_vlc_tabs[8]; |
| 37 | static VLC ct_vlc_tabs[4]; |
| 38 | static VLC spec_vlc_tabs[112]; |
| 39 | static VLC gain_vlc_tabs[11]; |
| 40 | static VLC tone_vlc_tabs[7]; |
| 41 | |
| 42 | #define GET_DELTA(gb, delta_bits) \ |
| 43 | ((delta_bits) ? get_bits((gb), (delta_bits)) : 0) |
| 44 | |
| 45 | /** |
| 46 | * Generate canonical VLC table from given descriptor. |
| 47 | * |
| 48 | * @param[in] cb ptr to codebook descriptor |
| 49 | * @param[in] xlat ptr to translation table or NULL |
| 50 | * @param[in,out] tab_offset starting offset to the generated vlc table |
| 51 | * @param[out] out_vlc ptr to vlc table to be generated |
| 52 | */ |
| 53 | static av_cold void build_canonical_huff(const uint8_t *cb, const uint8_t *xlat, |
| 54 | int *tab_offset, VLC *out_vlc) |
| 55 | { |
| 56 | int i, b; |
| 57 | uint16_t codes[256]; |
| 58 | uint8_t bits[256]; |
| 59 | unsigned code = 0; |
| 60 | int index = 0; |
| 61 | int min_len = *cb++; // get shortest codeword length |
| 62 | int max_len = *cb++; // get longest codeword length |
| 63 | |
| 64 | for (b = min_len; b <= max_len; b++) { |
| 65 | for (i = *cb++; i > 0; i--) { |
| 66 | av_assert0(index < 256); |
| 67 | bits[index] = b; |
| 68 | codes[index] = code++; |
| 69 | index++; |
| 70 | } |
| 71 | code <<= 1; |
| 72 | } |
| 73 | |
| 74 | out_vlc->table = &tables_data[*tab_offset]; |
| 75 | out_vlc->table_allocated = 1 << max_len; |
| 76 | |
| 77 | ff_init_vlc_sparse(out_vlc, max_len, index, bits, 1, 1, codes, 2, 2, |
| 78 | xlat, 1, 1, INIT_VLC_USE_NEW_STATIC); |
| 79 | |
| 80 | *tab_offset += 1 << max_len; |
| 81 | } |
| 82 | |
| 83 | av_cold void ff_atrac3p_init_vlcs(void) |
| 84 | { |
| 85 | int i, wl_vlc_offs, ct_vlc_offs, sf_vlc_offs, tab_offset; |
| 86 | |
| 87 | static const int wl_nb_bits[4] = { 2, 3, 5, 5 }; |
| 88 | static const int wl_nb_codes[4] = { 3, 5, 8, 8 }; |
| 89 | static const uint8_t * const wl_bits[4] = { |
| 90 | atrac3p_wl_huff_bits1, atrac3p_wl_huff_bits2, |
| 91 | atrac3p_wl_huff_bits3, atrac3p_wl_huff_bits4 |
| 92 | }; |
| 93 | static const uint8_t * const wl_codes[4] = { |
| 94 | atrac3p_wl_huff_code1, atrac3p_wl_huff_code2, |
| 95 | atrac3p_wl_huff_code3, atrac3p_wl_huff_code4 |
| 96 | }; |
| 97 | static const uint8_t * const wl_xlats[4] = { |
| 98 | atrac3p_wl_huff_xlat1, atrac3p_wl_huff_xlat2, NULL, NULL |
| 99 | }; |
| 100 | |
| 101 | static const int ct_nb_bits[4] = { 3, 4, 4, 4 }; |
| 102 | static const int ct_nb_codes[4] = { 4, 8, 8, 8 }; |
| 103 | static const uint8_t * const ct_bits[4] = { |
| 104 | atrac3p_ct_huff_bits1, atrac3p_ct_huff_bits2, |
| 105 | atrac3p_ct_huff_bits2, atrac3p_ct_huff_bits3 |
| 106 | }; |
| 107 | static const uint8_t * const ct_codes[4] = { |
| 108 | atrac3p_ct_huff_code1, atrac3p_ct_huff_code2, |
| 109 | atrac3p_ct_huff_code2, atrac3p_ct_huff_code3 |
| 110 | }; |
| 111 | static const uint8_t * const ct_xlats[4] = { |
| 112 | NULL, NULL, atrac3p_ct_huff_xlat1, NULL |
| 113 | }; |
| 114 | |
| 115 | static const int sf_nb_bits[8] = { 9, 9, 9, 9, 6, 6, 7, 7 }; |
| 116 | static const int sf_nb_codes[8] = { 64, 64, 64, 64, 16, 16, 16, 16 }; |
| 117 | static const uint8_t * const sf_bits[8] = { |
| 118 | atrac3p_sf_huff_bits1, atrac3p_sf_huff_bits1, atrac3p_sf_huff_bits2, |
| 119 | atrac3p_sf_huff_bits3, atrac3p_sf_huff_bits4, atrac3p_sf_huff_bits4, |
| 120 | atrac3p_sf_huff_bits5, atrac3p_sf_huff_bits6 |
| 121 | }; |
| 122 | static const uint16_t * const sf_codes[8] = { |
| 123 | atrac3p_sf_huff_code1, atrac3p_sf_huff_code1, atrac3p_sf_huff_code2, |
| 124 | atrac3p_sf_huff_code3, atrac3p_sf_huff_code4, atrac3p_sf_huff_code4, |
| 125 | atrac3p_sf_huff_code5, atrac3p_sf_huff_code6 |
| 126 | }; |
| 127 | static const uint8_t * const sf_xlats[8] = { |
| 128 | atrac3p_sf_huff_xlat1, atrac3p_sf_huff_xlat2, NULL, NULL, |
| 129 | atrac3p_sf_huff_xlat4, atrac3p_sf_huff_xlat5, NULL, NULL |
| 130 | }; |
| 131 | |
| 132 | static const uint8_t * const gain_cbs[11] = { |
| 133 | atrac3p_huff_gain_npoints1_cb, atrac3p_huff_gain_npoints1_cb, |
| 134 | atrac3p_huff_gain_lev1_cb, atrac3p_huff_gain_lev2_cb, |
| 135 | atrac3p_huff_gain_lev3_cb, atrac3p_huff_gain_lev4_cb, |
| 136 | atrac3p_huff_gain_loc3_cb, atrac3p_huff_gain_loc1_cb, |
| 137 | atrac3p_huff_gain_loc4_cb, atrac3p_huff_gain_loc2_cb, |
| 138 | atrac3p_huff_gain_loc5_cb |
| 139 | }; |
| 140 | static const uint8_t * const gain_xlats[11] = { |
| 141 | NULL, atrac3p_huff_gain_npoints2_xlat, atrac3p_huff_gain_lev1_xlat, |
| 142 | atrac3p_huff_gain_lev2_xlat, atrac3p_huff_gain_lev3_xlat, |
| 143 | atrac3p_huff_gain_lev4_xlat, atrac3p_huff_gain_loc3_xlat, |
| 144 | atrac3p_huff_gain_loc1_xlat, atrac3p_huff_gain_loc4_xlat, |
| 145 | atrac3p_huff_gain_loc2_xlat, atrac3p_huff_gain_loc5_xlat |
| 146 | }; |
| 147 | |
| 148 | static const uint8_t * const tone_cbs[7] = { |
| 149 | atrac3p_huff_tonebands_cb, atrac3p_huff_numwavs1_cb, |
| 150 | atrac3p_huff_numwavs2_cb, atrac3p_huff_wav_ampsf1_cb, |
| 151 | atrac3p_huff_wav_ampsf2_cb, atrac3p_huff_wav_ampsf3_cb, |
| 152 | atrac3p_huff_freq_cb |
| 153 | }; |
| 154 | static const uint8_t * const tone_xlats[7] = { |
| 155 | NULL, NULL, atrac3p_huff_numwavs2_xlat, atrac3p_huff_wav_ampsf1_xlat, |
| 156 | atrac3p_huff_wav_ampsf2_xlat, atrac3p_huff_wav_ampsf3_xlat, |
| 157 | atrac3p_huff_freq_xlat |
| 158 | }; |
| 159 | |
| 160 | for (i = 0, wl_vlc_offs = 0, ct_vlc_offs = 2508; i < 4; i++) { |
| 161 | wl_vlc_tabs[i].table = &tables_data[wl_vlc_offs]; |
| 162 | wl_vlc_tabs[i].table_allocated = 1 << wl_nb_bits[i]; |
| 163 | ct_vlc_tabs[i].table = &tables_data[ct_vlc_offs]; |
| 164 | ct_vlc_tabs[i].table_allocated = 1 << ct_nb_bits[i]; |
| 165 | |
| 166 | ff_init_vlc_sparse(&wl_vlc_tabs[i], wl_nb_bits[i], wl_nb_codes[i], |
| 167 | wl_bits[i], 1, 1, |
| 168 | wl_codes[i], 1, 1, |
| 169 | wl_xlats[i], 1, 1, |
| 170 | INIT_VLC_USE_NEW_STATIC); |
| 171 | |
| 172 | ff_init_vlc_sparse(&ct_vlc_tabs[i], ct_nb_bits[i], ct_nb_codes[i], |
| 173 | ct_bits[i], 1, 1, |
| 174 | ct_codes[i], 1, 1, |
| 175 | ct_xlats[i], 1, 1, |
| 176 | INIT_VLC_USE_NEW_STATIC); |
| 177 | |
| 178 | wl_vlc_offs += wl_vlc_tabs[i].table_allocated; |
| 179 | ct_vlc_offs += ct_vlc_tabs[i].table_allocated; |
| 180 | } |
| 181 | |
| 182 | for (i = 0, sf_vlc_offs = 76; i < 8; i++) { |
| 183 | sf_vlc_tabs[i].table = &tables_data[sf_vlc_offs]; |
| 184 | sf_vlc_tabs[i].table_allocated = 1 << sf_nb_bits[i]; |
| 185 | |
| 186 | ff_init_vlc_sparse(&sf_vlc_tabs[i], sf_nb_bits[i], sf_nb_codes[i], |
| 187 | sf_bits[i], 1, 1, |
| 188 | sf_codes[i], 2, 2, |
| 189 | sf_xlats[i], 1, 1, |
| 190 | INIT_VLC_USE_NEW_STATIC); |
| 191 | sf_vlc_offs += sf_vlc_tabs[i].table_allocated; |
| 192 | } |
| 193 | |
| 194 | tab_offset = 2564; |
| 195 | |
| 196 | /* build huffman tables for spectrum decoding */ |
| 197 | for (i = 0; i < 112; i++) { |
| 198 | if (atrac3p_spectra_tabs[i].cb) |
| 199 | build_canonical_huff(atrac3p_spectra_tabs[i].cb, |
| 200 | atrac3p_spectra_tabs[i].xlat, |
| 201 | &tab_offset, &spec_vlc_tabs[i]); |
| 202 | else |
| 203 | spec_vlc_tabs[i].table = 0; |
| 204 | } |
| 205 | |
| 206 | /* build huffman tables for gain data decoding */ |
| 207 | for (i = 0; i < 11; i++) |
| 208 | build_canonical_huff(gain_cbs[i], gain_xlats[i], &tab_offset, &gain_vlc_tabs[i]); |
| 209 | |
| 210 | /* build huffman tables for tone decoding */ |
| 211 | for (i = 0; i < 7; i++) |
| 212 | build_canonical_huff(tone_cbs[i], tone_xlats[i], &tab_offset, &tone_vlc_tabs[i]); |
| 213 | } |
| 214 | |
| 215 | /** |
| 216 | * Decode number of coded quantization units. |
| 217 | * |
| 218 | * @param[in] gb the GetBit context |
| 219 | * @param[in,out] chan ptr to the channel parameters |
| 220 | * @param[in,out] ctx ptr to the channel unit context |
| 221 | * @param[in] avctx ptr to the AVCodecContext |
| 222 | * @return result code: 0 = OK, otherwise - error code |
| 223 | */ |
| 224 | static int num_coded_units(GetBitContext *gb, Atrac3pChanParams *chan, |
| 225 | Atrac3pChanUnitCtx *ctx, AVCodecContext *avctx) |
| 226 | { |
| 227 | chan->fill_mode = get_bits(gb, 2); |
| 228 | if (!chan->fill_mode) { |
| 229 | chan->num_coded_vals = ctx->num_quant_units; |
| 230 | } else { |
| 231 | chan->num_coded_vals = get_bits(gb, 5); |
| 232 | if (chan->num_coded_vals > ctx->num_quant_units) { |
| 233 | av_log(avctx, AV_LOG_ERROR, |
| 234 | "Invalid number of transmitted units!\n"); |
| 235 | return AVERROR_INVALIDDATA; |
| 236 | } |
| 237 | |
| 238 | if (chan->fill_mode == 3) |
| 239 | chan->split_point = get_bits(gb, 2) + (chan->ch_num << 1) + 1; |
| 240 | } |
| 241 | |
| 242 | return 0; |
| 243 | } |
| 244 | |
| 245 | /** |
| 246 | * Add weighting coefficients to the decoded word-length information. |
| 247 | * |
| 248 | * @param[in,out] ctx ptr to the channel unit context |
| 249 | * @param[in,out] chan ptr to the channel parameters |
| 250 | * @param[in] wtab_idx index of the table of weights |
| 251 | * @param[in] avctx ptr to the AVCodecContext |
| 252 | * @return result code: 0 = OK, otherwise - error code |
| 253 | */ |
| 254 | static int add_wordlen_weights(Atrac3pChanUnitCtx *ctx, |
| 255 | Atrac3pChanParams *chan, int wtab_idx, |
| 256 | AVCodecContext *avctx) |
| 257 | { |
| 258 | int i; |
| 259 | const int8_t *weights_tab = |
| 260 | &atrac3p_wl_weights[chan->ch_num * 3 + wtab_idx - 1][0]; |
| 261 | |
| 262 | for (i = 0; i < ctx->num_quant_units; i++) { |
| 263 | chan->qu_wordlen[i] += weights_tab[i]; |
| 264 | if (chan->qu_wordlen[i] < 0 || chan->qu_wordlen[i] > 7) { |
| 265 | av_log(avctx, AV_LOG_ERROR, |
| 266 | "WL index out of range: pos=%d, val=%d!\n", |
| 267 | i, chan->qu_wordlen[i]); |
| 268 | return AVERROR_INVALIDDATA; |
| 269 | } |
| 270 | } |
| 271 | |
| 272 | return 0; |
| 273 | } |
| 274 | |
| 275 | /** |
| 276 | * Subtract weighting coefficients from decoded scalefactors. |
| 277 | * |
| 278 | * @param[in,out] ctx ptr to the channel unit context |
| 279 | * @param[in,out] chan ptr to the channel parameters |
| 280 | * @param[in] wtab_idx index of table of weights |
| 281 | * @param[in] avctx ptr to the AVCodecContext |
| 282 | * @return result code: 0 = OK, otherwise - error code |
| 283 | */ |
| 284 | static int subtract_sf_weights(Atrac3pChanUnitCtx *ctx, |
| 285 | Atrac3pChanParams *chan, int wtab_idx, |
| 286 | AVCodecContext *avctx) |
| 287 | { |
| 288 | int i; |
| 289 | const int8_t *weights_tab = &atrac3p_sf_weights[wtab_idx - 1][0]; |
| 290 | |
| 291 | for (i = 0; i < ctx->used_quant_units; i++) { |
| 292 | chan->qu_sf_idx[i] -= weights_tab[i]; |
| 293 | if (chan->qu_sf_idx[i] < 0 || chan->qu_sf_idx[i] > 63) { |
| 294 | av_log(avctx, AV_LOG_ERROR, |
| 295 | "SF index out of range: pos=%d, val=%d!\n", |
| 296 | i, chan->qu_sf_idx[i]); |
| 297 | return AVERROR_INVALIDDATA; |
| 298 | } |
| 299 | } |
| 300 | |
| 301 | return 0; |
| 302 | } |
| 303 | |
| 304 | /** |
| 305 | * Unpack vector quantization tables. |
| 306 | * |
| 307 | * @param[in] start_val start value for the unpacked table |
| 308 | * @param[in] shape_vec ptr to table to unpack |
| 309 | * @param[out] dst ptr to output array |
| 310 | * @param[in] num_values number of values to unpack |
| 311 | */ |
| 312 | static inline void unpack_vq_shape(int start_val, const int8_t *shape_vec, |
| 313 | int *dst, int num_values) |
| 314 | { |
| 315 | int i; |
| 316 | |
| 317 | if (num_values) { |
| 318 | dst[0] = dst[1] = dst[2] = start_val; |
| 319 | for (i = 3; i < num_values; i++) |
| 320 | dst[i] = start_val - shape_vec[atrac3p_qu_num_to_seg[i] - 1]; |
| 321 | } |
| 322 | } |
| 323 | |
| 324 | #define UNPACK_SF_VQ_SHAPE(gb, dst, num_vals) \ |
| 325 | start_val = get_bits((gb), 6); \ |
| 326 | unpack_vq_shape(start_val, &atrac3p_sf_shapes[get_bits((gb), 6)][0], \ |
| 327 | (dst), (num_vals)) |
| 328 | |
| 329 | /** |
| 330 | * Decode word length for each quantization unit of a channel. |
| 331 | * |
| 332 | * @param[in] gb the GetBit context |
| 333 | * @param[in,out] ctx ptr to the channel unit context |
| 334 | * @param[in] ch_num channel to process |
| 335 | * @param[in] avctx ptr to the AVCodecContext |
| 336 | * @return result code: 0 = OK, otherwise - error code |
| 337 | */ |
| 338 | static int decode_channel_wordlen(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| 339 | int ch_num, AVCodecContext *avctx) |
| 340 | { |
| 341 | int i, weight_idx = 0, delta, diff, pos, delta_bits, min_val, flag, |
| 342 | ret, start_val; |
| 343 | VLC *vlc_tab; |
| 344 | Atrac3pChanParams *chan = &ctx->channels[ch_num]; |
| 345 | Atrac3pChanParams *ref_chan = &ctx->channels[0]; |
| 346 | |
| 347 | chan->fill_mode = 0; |
| 348 | |
| 349 | switch (get_bits(gb, 2)) { /* switch according to coding mode */ |
| 350 | case 0: /* coded using constant number of bits */ |
| 351 | for (i = 0; i < ctx->num_quant_units; i++) |
| 352 | chan->qu_wordlen[i] = get_bits(gb, 3); |
| 353 | break; |
| 354 | case 1: |
| 355 | if (ch_num) { |
| 356 | if ((ret = num_coded_units(gb, chan, ctx, avctx)) < 0) |
| 357 | return ret; |
| 358 | |
| 359 | if (chan->num_coded_vals) { |
| 360 | vlc_tab = &wl_vlc_tabs[get_bits(gb, 2)]; |
| 361 | |
| 362 | for (i = 0; i < chan->num_coded_vals; i++) { |
| 363 | delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1); |
| 364 | chan->qu_wordlen[i] = (ref_chan->qu_wordlen[i] + delta) & 7; |
| 365 | } |
| 366 | } |
| 367 | } else { |
| 368 | weight_idx = get_bits(gb, 2); |
| 369 | if ((ret = num_coded_units(gb, chan, ctx, avctx)) < 0) |
| 370 | return ret; |
| 371 | |
| 372 | if (chan->num_coded_vals) { |
| 373 | pos = get_bits(gb, 5); |
| 374 | if (pos > chan->num_coded_vals) { |
| 375 | av_log(avctx, AV_LOG_ERROR, |
| 376 | "WL mode 1: invalid position!\n"); |
| 377 | return AVERROR_INVALIDDATA; |
| 378 | } |
| 379 | |
| 380 | delta_bits = get_bits(gb, 2); |
| 381 | min_val = get_bits(gb, 3); |
| 382 | |
| 383 | for (i = 0; i < pos; i++) |
| 384 | chan->qu_wordlen[i] = get_bits(gb, 3); |
| 385 | |
| 386 | for (i = pos; i < chan->num_coded_vals; i++) |
| 387 | chan->qu_wordlen[i] = (min_val + GET_DELTA(gb, delta_bits)) & 7; |
| 388 | } |
| 389 | } |
| 390 | break; |
| 391 | case 2: |
| 392 | if ((ret = num_coded_units(gb, chan, ctx, avctx)) < 0) |
| 393 | return ret; |
| 394 | |
| 395 | if (ch_num && chan->num_coded_vals) { |
| 396 | vlc_tab = &wl_vlc_tabs[get_bits(gb, 2)]; |
| 397 | delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1); |
| 398 | chan->qu_wordlen[0] = (ref_chan->qu_wordlen[0] + delta) & 7; |
| 399 | |
| 400 | for (i = 1; i < chan->num_coded_vals; i++) { |
| 401 | diff = ref_chan->qu_wordlen[i] - ref_chan->qu_wordlen[i - 1]; |
| 402 | delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1); |
| 403 | chan->qu_wordlen[i] = (chan->qu_wordlen[i - 1] + diff + delta) & 7; |
| 404 | } |
| 405 | } else if (chan->num_coded_vals) { |
| 406 | flag = get_bits(gb, 1); |
| 407 | vlc_tab = &wl_vlc_tabs[get_bits(gb, 1)]; |
| 408 | |
| 409 | start_val = get_bits(gb, 3); |
| 410 | unpack_vq_shape(start_val, |
| 411 | &atrac3p_wl_shapes[start_val][get_bits(gb, 4)][0], |
| 412 | chan->qu_wordlen, chan->num_coded_vals); |
| 413 | |
| 414 | if (!flag) { |
| 415 | for (i = 0; i < chan->num_coded_vals; i++) { |
| 416 | delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1); |
| 417 | chan->qu_wordlen[i] = (chan->qu_wordlen[i] + delta) & 7; |
| 418 | } |
| 419 | } else { |
| 420 | for (i = 0; i < (chan->num_coded_vals & - 2); i += 2) |
| 421 | if (!get_bits1(gb)) { |
| 422 | chan->qu_wordlen[i] = (chan->qu_wordlen[i] + |
| 423 | get_vlc2(gb, vlc_tab->table, |
| 424 | vlc_tab->bits, 1)) & 7; |
| 425 | chan->qu_wordlen[i + 1] = (chan->qu_wordlen[i + 1] + |
| 426 | get_vlc2(gb, vlc_tab->table, |
| 427 | vlc_tab->bits, 1)) & 7; |
| 428 | } |
| 429 | |
| 430 | if (chan->num_coded_vals & 1) |
| 431 | chan->qu_wordlen[i] = (chan->qu_wordlen[i] + |
| 432 | get_vlc2(gb, vlc_tab->table, |
| 433 | vlc_tab->bits, 1)) & 7; |
| 434 | } |
| 435 | } |
| 436 | break; |
| 437 | case 3: |
| 438 | weight_idx = get_bits(gb, 2); |
| 439 | if ((ret = num_coded_units(gb, chan, ctx, avctx)) < 0) |
| 440 | return ret; |
| 441 | |
| 442 | if (chan->num_coded_vals) { |
| 443 | vlc_tab = &wl_vlc_tabs[get_bits(gb, 2)]; |
| 444 | |
| 445 | /* first coefficient is coded directly */ |
| 446 | chan->qu_wordlen[0] = get_bits(gb, 3); |
| 447 | |
| 448 | for (i = 1; i < chan->num_coded_vals; i++) { |
| 449 | delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1); |
| 450 | chan->qu_wordlen[i] = (chan->qu_wordlen[i - 1] + delta) & 7; |
| 451 | } |
| 452 | } |
| 453 | break; |
| 454 | } |
| 455 | |
| 456 | if (chan->fill_mode == 2) { |
| 457 | for (i = chan->num_coded_vals; i < ctx->num_quant_units; i++) |
| 458 | chan->qu_wordlen[i] = ch_num ? get_bits1(gb) : 1; |
| 459 | } else if (chan->fill_mode == 3) { |
| 460 | pos = ch_num ? chan->num_coded_vals + chan->split_point |
| 461 | : ctx->num_quant_units - chan->split_point; |
| 462 | for (i = chan->num_coded_vals; i < pos; i++) |
| 463 | chan->qu_wordlen[i] = 1; |
| 464 | } |
| 465 | |
| 466 | if (weight_idx) |
| 467 | return add_wordlen_weights(ctx, chan, weight_idx, avctx); |
| 468 | |
| 469 | return 0; |
| 470 | } |
| 471 | |
| 472 | /** |
| 473 | * Decode scale factor indexes for each quant unit of a channel. |
| 474 | * |
| 475 | * @param[in] gb the GetBit context |
| 476 | * @param[in,out] ctx ptr to the channel unit context |
| 477 | * @param[in] ch_num channel to process |
| 478 | * @param[in] avctx ptr to the AVCodecContext |
| 479 | * @return result code: 0 = OK, otherwise - error code |
| 480 | */ |
| 481 | static int decode_channel_sf_idx(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| 482 | int ch_num, AVCodecContext *avctx) |
| 483 | { |
| 484 | int i, weight_idx = 0, delta, diff, num_long_vals, |
| 485 | delta_bits, min_val, vlc_sel, start_val; |
| 486 | VLC *vlc_tab; |
| 487 | Atrac3pChanParams *chan = &ctx->channels[ch_num]; |
| 488 | Atrac3pChanParams *ref_chan = &ctx->channels[0]; |
| 489 | |
| 490 | switch (get_bits(gb, 2)) { /* switch according to coding mode */ |
| 491 | case 0: /* coded using constant number of bits */ |
| 492 | for (i = 0; i < ctx->used_quant_units; i++) |
| 493 | chan->qu_sf_idx[i] = get_bits(gb, 6); |
| 494 | break; |
| 495 | case 1: |
| 496 | if (ch_num) { |
| 497 | vlc_tab = &sf_vlc_tabs[get_bits(gb, 2)]; |
| 498 | |
| 499 | for (i = 0; i < ctx->used_quant_units; i++) { |
| 500 | delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1); |
| 501 | chan->qu_sf_idx[i] = (ref_chan->qu_sf_idx[i] + delta) & 0x3F; |
| 502 | } |
| 503 | } else { |
| 504 | weight_idx = get_bits(gb, 2); |
| 505 | if (weight_idx == 3) { |
| 506 | UNPACK_SF_VQ_SHAPE(gb, chan->qu_sf_idx, ctx->used_quant_units); |
| 507 | |
| 508 | num_long_vals = get_bits(gb, 5); |
| 509 | delta_bits = get_bits(gb, 2); |
| 510 | min_val = get_bits(gb, 4) - 7; |
| 511 | |
| 512 | for (i = 0; i < num_long_vals; i++) |
| 513 | chan->qu_sf_idx[i] = (chan->qu_sf_idx[i] + |
| 514 | get_bits(gb, 4) - 7) & 0x3F; |
| 515 | |
| 516 | /* all others are: min_val + delta */ |
| 517 | for (i = num_long_vals; i < ctx->used_quant_units; i++) |
| 518 | chan->qu_sf_idx[i] = (chan->qu_sf_idx[i] + min_val + |
| 519 | GET_DELTA(gb, delta_bits)) & 0x3F; |
| 520 | } else { |
| 521 | num_long_vals = get_bits(gb, 5); |
| 522 | delta_bits = get_bits(gb, 3); |
| 523 | min_val = get_bits(gb, 6); |
| 524 | if (num_long_vals > ctx->used_quant_units || delta_bits == 7) { |
| 525 | av_log(avctx, AV_LOG_ERROR, |
| 526 | "SF mode 1: invalid parameters!\n"); |
| 527 | return AVERROR_INVALIDDATA; |
| 528 | } |
| 529 | |
| 530 | /* read full-precision SF indexes */ |
| 531 | for (i = 0; i < num_long_vals; i++) |
| 532 | chan->qu_sf_idx[i] = get_bits(gb, 6); |
| 533 | |
| 534 | /* all others are: min_val + delta */ |
| 535 | for (i = num_long_vals; i < ctx->used_quant_units; i++) |
| 536 | chan->qu_sf_idx[i] = (min_val + |
| 537 | GET_DELTA(gb, delta_bits)) & 0x3F; |
| 538 | } |
| 539 | } |
| 540 | break; |
| 541 | case 2: |
| 542 | if (ch_num) { |
| 543 | vlc_tab = &sf_vlc_tabs[get_bits(gb, 2)]; |
| 544 | |
| 545 | delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1); |
| 546 | chan->qu_sf_idx[0] = (ref_chan->qu_sf_idx[0] + delta) & 0x3F; |
| 547 | |
| 548 | for (i = 1; i < ctx->used_quant_units; i++) { |
| 549 | diff = ref_chan->qu_sf_idx[i] - ref_chan->qu_sf_idx[i - 1]; |
| 550 | delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1); |
| 551 | chan->qu_sf_idx[i] = (chan->qu_sf_idx[i - 1] + diff + delta) & 0x3F; |
| 552 | } |
| 553 | } else { |
| 554 | vlc_tab = &sf_vlc_tabs[get_bits(gb, 2) + 4]; |
| 555 | |
| 556 | UNPACK_SF_VQ_SHAPE(gb, chan->qu_sf_idx, ctx->used_quant_units); |
| 557 | |
| 558 | for (i = 0; i < ctx->used_quant_units; i++) { |
| 559 | delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1); |
| 560 | chan->qu_sf_idx[i] = (chan->qu_sf_idx[i] + |
| 561 | sign_extend(delta, 4)) & 0x3F; |
| 562 | } |
| 563 | } |
| 564 | break; |
| 565 | case 3: |
| 566 | if (ch_num) { |
| 567 | /* copy coefficients from reference channel */ |
| 568 | for (i = 0; i < ctx->used_quant_units; i++) |
| 569 | chan->qu_sf_idx[i] = ref_chan->qu_sf_idx[i]; |
| 570 | } else { |
| 571 | weight_idx = get_bits(gb, 2); |
| 572 | vlc_sel = get_bits(gb, 2); |
| 573 | vlc_tab = &sf_vlc_tabs[vlc_sel]; |
| 574 | |
| 575 | if (weight_idx == 3) { |
| 576 | vlc_tab = &sf_vlc_tabs[vlc_sel + 4]; |
| 577 | |
| 578 | UNPACK_SF_VQ_SHAPE(gb, chan->qu_sf_idx, ctx->used_quant_units); |
| 579 | |
| 580 | diff = (get_bits(gb, 4) + 56) & 0x3F; |
| 581 | chan->qu_sf_idx[0] = (chan->qu_sf_idx[0] + diff) & 0x3F; |
| 582 | |
| 583 | for (i = 1; i < ctx->used_quant_units; i++) { |
| 584 | delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1); |
| 585 | diff = (diff + sign_extend(delta, 4)) & 0x3F; |
| 586 | chan->qu_sf_idx[i] = (diff + chan->qu_sf_idx[i]) & 0x3F; |
| 587 | } |
| 588 | } else { |
| 589 | /* 1st coefficient is coded directly */ |
| 590 | chan->qu_sf_idx[0] = get_bits(gb, 6); |
| 591 | |
| 592 | for (i = 1; i < ctx->used_quant_units; i++) { |
| 593 | delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1); |
| 594 | chan->qu_sf_idx[i] = (chan->qu_sf_idx[i - 1] + delta) & 0x3F; |
| 595 | } |
| 596 | } |
| 597 | } |
| 598 | break; |
| 599 | } |
| 600 | |
| 601 | if (weight_idx && weight_idx < 3) |
| 602 | return subtract_sf_weights(ctx, chan, weight_idx, avctx); |
| 603 | |
| 604 | return 0; |
| 605 | } |
| 606 | |
| 607 | /** |
| 608 | * Decode word length information for each channel. |
| 609 | * |
| 610 | * @param[in] gb the GetBit context |
| 611 | * @param[in,out] ctx ptr to the channel unit context |
| 612 | * @param[in] num_channels number of channels to process |
| 613 | * @param[in] avctx ptr to the AVCodecContext |
| 614 | * @return result code: 0 = OK, otherwise - error code |
| 615 | */ |
| 616 | static int decode_quant_wordlen(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| 617 | int num_channels, AVCodecContext *avctx) |
| 618 | { |
| 619 | int ch_num, i, ret; |
| 620 | |
| 621 | for (ch_num = 0; ch_num < num_channels; ch_num++) { |
| 622 | memset(ctx->channels[ch_num].qu_wordlen, 0, |
| 623 | sizeof(ctx->channels[ch_num].qu_wordlen)); |
| 624 | |
| 625 | if ((ret = decode_channel_wordlen(gb, ctx, ch_num, avctx)) < 0) |
| 626 | return ret; |
| 627 | } |
| 628 | |
| 629 | /* scan for last non-zero coeff in both channels and |
| 630 | * set number of quant units having coded spectrum */ |
| 631 | for (i = ctx->num_quant_units - 1; i >= 0; i--) |
| 632 | if (ctx->channels[0].qu_wordlen[i] || |
| 633 | (num_channels == 2 && ctx->channels[1].qu_wordlen[i])) |
| 634 | break; |
| 635 | ctx->used_quant_units = i + 1; |
| 636 | |
| 637 | return 0; |
| 638 | } |
| 639 | |
| 640 | /** |
| 641 | * Decode scale factor indexes for each channel. |
| 642 | * |
| 643 | * @param[in] gb the GetBit context |
| 644 | * @param[in,out] ctx ptr to the channel unit context |
| 645 | * @param[in] num_channels number of channels to process |
| 646 | * @param[in] avctx ptr to the AVCodecContext |
| 647 | * @return result code: 0 = OK, otherwise - error code |
| 648 | */ |
| 649 | static int decode_scale_factors(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| 650 | int num_channels, AVCodecContext *avctx) |
| 651 | { |
| 652 | int ch_num, ret; |
| 653 | |
| 654 | if (!ctx->used_quant_units) |
| 655 | return 0; |
| 656 | |
| 657 | for (ch_num = 0; ch_num < num_channels; ch_num++) { |
| 658 | memset(ctx->channels[ch_num].qu_sf_idx, 0, |
| 659 | sizeof(ctx->channels[ch_num].qu_sf_idx)); |
| 660 | |
| 661 | if ((ret = decode_channel_sf_idx(gb, ctx, ch_num, avctx)) < 0) |
| 662 | return ret; |
| 663 | } |
| 664 | |
| 665 | return 0; |
| 666 | } |
| 667 | |
| 668 | /** |
| 669 | * Decode number of code table values. |
| 670 | * |
| 671 | * @param[in] gb the GetBit context |
| 672 | * @param[in,out] ctx ptr to the channel unit context |
| 673 | * @param[in] avctx ptr to the AVCodecContext |
| 674 | * @return result code: 0 = OK, otherwise - error code |
| 675 | */ |
| 676 | static int get_num_ct_values(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| 677 | AVCodecContext *avctx) |
| 678 | { |
| 679 | int num_coded_vals; |
| 680 | |
| 681 | if (get_bits1(gb)) { |
| 682 | num_coded_vals = get_bits(gb, 5); |
| 683 | if (num_coded_vals > ctx->used_quant_units) { |
| 684 | av_log(avctx, AV_LOG_ERROR, |
| 685 | "Invalid number of code table indexes: %d!\n", num_coded_vals); |
| 686 | return AVERROR_INVALIDDATA; |
| 687 | } |
| 688 | return num_coded_vals; |
| 689 | } else |
| 690 | return ctx->used_quant_units; |
| 691 | } |
| 692 | |
| 693 | #define DEC_CT_IDX_COMMON(OP) \ |
| 694 | num_vals = get_num_ct_values(gb, ctx, avctx); \ |
| 695 | if (num_vals < 0) \ |
| 696 | return num_vals; \ |
| 697 | \ |
| 698 | for (i = 0; i < num_vals; i++) { \ |
| 699 | if (chan->qu_wordlen[i]) { \ |
| 700 | chan->qu_tab_idx[i] = OP; \ |
| 701 | } else if (ch_num && ref_chan->qu_wordlen[i]) \ |
| 702 | /* get clone master flag */ \ |
| 703 | chan->qu_tab_idx[i] = get_bits1(gb); \ |
| 704 | } |
| 705 | |
| 706 | #define CODING_DIRECT get_bits(gb, num_bits) |
| 707 | |
| 708 | #define CODING_VLC get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1) |
| 709 | |
| 710 | #define CODING_VLC_DELTA \ |
| 711 | (!i) ? CODING_VLC \ |
| 712 | : (pred + get_vlc2(gb, delta_vlc->table, \ |
| 713 | delta_vlc->bits, 1)) & mask; \ |
| 714 | pred = chan->qu_tab_idx[i] |
| 715 | |
| 716 | #define CODING_VLC_DIFF \ |
| 717 | (ref_chan->qu_tab_idx[i] + \ |
| 718 | get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1)) & mask |
| 719 | |
| 720 | /** |
| 721 | * Decode code table indexes for each quant unit of a channel. |
| 722 | * |
| 723 | * @param[in] gb the GetBit context |
| 724 | * @param[in,out] ctx ptr to the channel unit context |
| 725 | * @param[in] ch_num channel to process |
| 726 | * @param[in] avctx ptr to the AVCodecContext |
| 727 | * @return result code: 0 = OK, otherwise - error code |
| 728 | */ |
| 729 | static int decode_channel_code_tab(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| 730 | int ch_num, AVCodecContext *avctx) |
| 731 | { |
| 732 | int i, num_vals, num_bits, pred; |
| 733 | int mask = ctx->use_full_table ? 7 : 3; /* mask for modular arithmetic */ |
| 734 | VLC *vlc_tab, *delta_vlc; |
| 735 | Atrac3pChanParams *chan = &ctx->channels[ch_num]; |
| 736 | Atrac3pChanParams *ref_chan = &ctx->channels[0]; |
| 737 | |
| 738 | chan->table_type = get_bits1(gb); |
| 739 | |
| 740 | switch (get_bits(gb, 2)) { /* switch according to coding mode */ |
| 741 | case 0: /* directly coded */ |
| 742 | num_bits = ctx->use_full_table + 2; |
| 743 | DEC_CT_IDX_COMMON(CODING_DIRECT); |
| 744 | break; |
| 745 | case 1: /* entropy-coded */ |
| 746 | vlc_tab = ctx->use_full_table ? &ct_vlc_tabs[1] |
| 747 | : ct_vlc_tabs; |
| 748 | DEC_CT_IDX_COMMON(CODING_VLC); |
| 749 | break; |
| 750 | case 2: /* entropy-coded delta */ |
| 751 | if (ctx->use_full_table) { |
| 752 | vlc_tab = &ct_vlc_tabs[1]; |
| 753 | delta_vlc = &ct_vlc_tabs[2]; |
| 754 | } else { |
| 755 | vlc_tab = ct_vlc_tabs; |
| 756 | delta_vlc = ct_vlc_tabs; |
| 757 | } |
| 758 | pred = 0; |
| 759 | DEC_CT_IDX_COMMON(CODING_VLC_DELTA); |
| 760 | break; |
| 761 | case 3: /* entropy-coded difference to master */ |
| 762 | if (ch_num) { |
| 763 | vlc_tab = ctx->use_full_table ? &ct_vlc_tabs[3] |
| 764 | : ct_vlc_tabs; |
| 765 | DEC_CT_IDX_COMMON(CODING_VLC_DIFF); |
| 766 | } |
| 767 | break; |
| 768 | } |
| 769 | |
| 770 | return 0; |
| 771 | } |
| 772 | |
| 773 | /** |
| 774 | * Decode code table indexes for each channel. |
| 775 | * |
| 776 | * @param[in] gb the GetBit context |
| 777 | * @param[in,out] ctx ptr to the channel unit context |
| 778 | * @param[in] num_channels number of channels to process |
| 779 | * @param[in] avctx ptr to the AVCodecContext |
| 780 | * @return result code: 0 = OK, otherwise - error code |
| 781 | */ |
| 782 | static int decode_code_table_indexes(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| 783 | int num_channels, AVCodecContext *avctx) |
| 784 | { |
| 785 | int ch_num, ret; |
| 786 | |
| 787 | if (!ctx->used_quant_units) |
| 788 | return 0; |
| 789 | |
| 790 | ctx->use_full_table = get_bits1(gb); |
| 791 | |
| 792 | for (ch_num = 0; ch_num < num_channels; ch_num++) { |
| 793 | memset(ctx->channels[ch_num].qu_tab_idx, 0, |
| 794 | sizeof(ctx->channels[ch_num].qu_tab_idx)); |
| 795 | |
| 796 | if ((ret = decode_channel_code_tab(gb, ctx, ch_num, avctx)) < 0) |
| 797 | return ret; |
| 798 | } |
| 799 | |
| 800 | return 0; |
| 801 | } |
| 802 | |
| 803 | /** |
| 804 | * Decode huffman-coded spectral lines for a given quant unit. |
| 805 | * |
| 806 | * This is a generalized version for all known coding modes. |
| 807 | * Its speed can be improved by creating separate functions for each mode. |
| 808 | * |
| 809 | * @param[in] gb the GetBit context |
| 810 | * @param[in] tab code table telling how to decode spectral lines |
| 811 | * @param[in] vlc_tab ptr to the huffman table associated with the code table |
| 812 | * @param[out] out pointer to buffer where decoded data should be stored |
| 813 | * @param[in] num_specs number of spectral lines to decode |
| 814 | */ |
| 815 | static void decode_qu_spectra(GetBitContext *gb, const Atrac3pSpecCodeTab *tab, |
| 816 | VLC *vlc_tab, int16_t *out, const int num_specs) |
| 817 | { |
| 818 | int i, j, pos, cf; |
| 819 | int group_size = tab->group_size; |
| 820 | int num_coeffs = tab->num_coeffs; |
| 821 | int bits = tab->bits; |
| 822 | int is_signed = tab->is_signed; |
| 823 | unsigned val, mask = (1 << bits) - 1; |
| 824 | |
| 825 | for (pos = 0; pos < num_specs;) { |
| 826 | if (group_size == 1 || get_bits1(gb)) { |
| 827 | for (j = 0; j < group_size; j++) { |
| 828 | val = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1); |
| 829 | |
| 830 | for (i = 0; i < num_coeffs; i++) { |
| 831 | cf = val & mask; |
| 832 | if (is_signed) |
| 833 | cf = sign_extend(cf, bits); |
| 834 | else if (cf && get_bits1(gb)) |
| 835 | cf = -cf; |
| 836 | |
| 837 | out[pos++] = cf; |
| 838 | val >>= bits; |
| 839 | } |
| 840 | } |
| 841 | } else /* group skipped */ |
| 842 | pos += group_size * num_coeffs; |
| 843 | } |
| 844 | } |
| 845 | |
| 846 | /** |
| 847 | * Decode huffman-coded IMDCT spectrum for all channels. |
| 848 | * |
| 849 | * @param[in] gb the GetBit context |
| 850 | * @param[in,out] ctx ptr to the channel unit context |
| 851 | * @param[in] num_channels number of channels to process |
| 852 | * @param[in] avctx ptr to the AVCodecContext |
| 853 | */ |
| 854 | static void decode_spectrum(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| 855 | int num_channels, AVCodecContext *avctx) |
| 856 | { |
| 857 | int i, ch_num, qu, wordlen, codetab, tab_index, num_specs; |
| 858 | const Atrac3pSpecCodeTab *tab; |
| 859 | Atrac3pChanParams *chan; |
| 860 | |
| 861 | for (ch_num = 0; ch_num < num_channels; ch_num++) { |
| 862 | chan = &ctx->channels[ch_num]; |
| 863 | |
| 864 | memset(chan->spectrum, 0, sizeof(chan->spectrum)); |
| 865 | |
| 866 | /* set power compensation level to disabled */ |
| 867 | memset(chan->power_levs, ATRAC3P_POWER_COMP_OFF, sizeof(chan->power_levs)); |
| 868 | |
| 869 | for (qu = 0; qu < ctx->used_quant_units; qu++) { |
| 870 | num_specs = ff_atrac3p_qu_to_spec_pos[qu + 1] - |
| 871 | ff_atrac3p_qu_to_spec_pos[qu]; |
| 872 | |
| 873 | wordlen = chan->qu_wordlen[qu]; |
| 874 | codetab = chan->qu_tab_idx[qu]; |
| 875 | if (wordlen) { |
| 876 | if (!ctx->use_full_table) |
| 877 | codetab = atrac3p_ct_restricted_to_full[chan->table_type][wordlen - 1][codetab]; |
| 878 | |
| 879 | tab_index = (chan->table_type * 8 + codetab) * 7 + wordlen - 1; |
| 880 | tab = &atrac3p_spectra_tabs[tab_index]; |
| 881 | |
| 882 | /* this allows reusing VLC tables */ |
| 883 | if (tab->redirect >= 0) |
| 884 | tab_index = tab->redirect; |
| 885 | |
| 886 | decode_qu_spectra(gb, tab, &spec_vlc_tabs[tab_index], |
| 887 | &chan->spectrum[ff_atrac3p_qu_to_spec_pos[qu]], |
| 888 | num_specs); |
| 889 | } else if (ch_num && ctx->channels[0].qu_wordlen[qu] && !codetab) { |
| 890 | /* copy coefficients from master */ |
| 891 | memcpy(&chan->spectrum[ff_atrac3p_qu_to_spec_pos[qu]], |
| 892 | &ctx->channels[0].spectrum[ff_atrac3p_qu_to_spec_pos[qu]], |
| 893 | num_specs * |
| 894 | sizeof(chan->spectrum[ff_atrac3p_qu_to_spec_pos[qu]])); |
| 895 | chan->qu_wordlen[qu] = ctx->channels[0].qu_wordlen[qu]; |
| 896 | } |
| 897 | } |
| 898 | |
| 899 | /* Power compensation levels only present in the bitstream |
| 900 | * if there are more than 2 quant units. The lowest two units |
| 901 | * correspond to the frequencies 0...351 Hz, whose shouldn't |
| 902 | * be affected by the power compensation. */ |
| 903 | if (ctx->used_quant_units > 2) { |
| 904 | num_specs = atrac3p_subband_to_num_powgrps[ctx->num_coded_subbands - 1]; |
| 905 | for (i = 0; i < num_specs; i++) |
| 906 | chan->power_levs[i] = get_bits(gb, 4); |
| 907 | } |
| 908 | } |
| 909 | } |
| 910 | |
| 911 | /** |
| 912 | * Retrieve specified amount of flag bits from the input bitstream. |
| 913 | * The data can be shortened in the case of the following two common conditions: |
| 914 | * if all bits are zero then only one signal bit = 0 will be stored, |
| 915 | * if all bits are ones then two signal bits = 1,0 will be stored. |
| 916 | * Otherwise, all necessary bits will be directly stored |
| 917 | * prefixed by two signal bits = 1,1. |
| 918 | * |
| 919 | * @param[in] gb ptr to the GetBitContext |
| 920 | * @param[out] out where to place decoded flags |
| 921 | * @param[in] num_flags number of flags to process |
| 922 | * @return: 0 = all flag bits are zero, 1 = there is at least one non-zero flag bit |
| 923 | */ |
| 924 | static int get_subband_flags(GetBitContext *gb, uint8_t *out, int num_flags) |
| 925 | { |
| 926 | int i, result; |
| 927 | |
| 928 | memset(out, 0, num_flags); |
| 929 | |
| 930 | result = get_bits1(gb); |
| 931 | if (result) { |
| 932 | if (get_bits1(gb)) |
| 933 | for (i = 0; i < num_flags; i++) |
| 934 | out[i] = get_bits1(gb); |
| 935 | else |
| 936 | memset(out, 1, num_flags); |
| 937 | } |
| 938 | |
| 939 | return result; |
| 940 | } |
| 941 | |
| 942 | /** |
| 943 | * Decode mdct window shape flags for all channels. |
| 944 | * |
| 945 | * @param[in] gb the GetBit context |
| 946 | * @param[in,out] ctx ptr to the channel unit context |
| 947 | * @param[in] num_channels number of channels to process |
| 948 | */ |
| 949 | static void decode_window_shape(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| 950 | int num_channels) |
| 951 | { |
| 952 | int ch_num; |
| 953 | |
| 954 | for (ch_num = 0; ch_num < num_channels; ch_num++) |
| 955 | get_subband_flags(gb, ctx->channels[ch_num].wnd_shape, |
| 956 | ctx->num_subbands); |
| 957 | } |
| 958 | |
| 959 | /** |
| 960 | * Decode number of gain control points. |
| 961 | * |
| 962 | * @param[in] gb the GetBit context |
| 963 | * @param[in,out] ctx ptr to the channel unit context |
| 964 | * @param[in] ch_num channel to process |
| 965 | * @param[in] coded_subbands number of subbands to process |
| 966 | * @return result code: 0 = OK, otherwise - error code |
| 967 | */ |
| 968 | static int decode_gainc_npoints(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| 969 | int ch_num, int coded_subbands) |
| 970 | { |
| 971 | int i, delta, delta_bits, min_val; |
| 972 | Atrac3pChanParams *chan = &ctx->channels[ch_num]; |
| 973 | Atrac3pChanParams *ref_chan = &ctx->channels[0]; |
| 974 | |
| 975 | switch (get_bits(gb, 2)) { /* switch according to coding mode */ |
| 976 | case 0: /* fixed-length coding */ |
| 977 | for (i = 0; i < coded_subbands; i++) |
| 978 | chan->gain_data[i].num_points = get_bits(gb, 3); |
| 979 | break; |
| 980 | case 1: /* variable-length coding */ |
| 981 | for (i = 0; i < coded_subbands; i++) |
| 982 | chan->gain_data[i].num_points = |
| 983 | get_vlc2(gb, gain_vlc_tabs[0].table, |
| 984 | gain_vlc_tabs[0].bits, 1); |
| 985 | break; |
| 986 | case 2: |
| 987 | if (ch_num) { /* VLC modulo delta to master channel */ |
| 988 | for (i = 0; i < coded_subbands; i++) { |
| 989 | delta = get_vlc2(gb, gain_vlc_tabs[1].table, |
| 990 | gain_vlc_tabs[1].bits, 1); |
| 991 | chan->gain_data[i].num_points = |
| 992 | (ref_chan->gain_data[i].num_points + delta) & 7; |
| 993 | } |
| 994 | } else { /* VLC modulo delta to previous */ |
| 995 | chan->gain_data[0].num_points = |
| 996 | get_vlc2(gb, gain_vlc_tabs[0].table, |
| 997 | gain_vlc_tabs[0].bits, 1); |
| 998 | |
| 999 | for (i = 1; i < coded_subbands; i++) { |
| 1000 | delta = get_vlc2(gb, gain_vlc_tabs[1].table, |
| 1001 | gain_vlc_tabs[1].bits, 1); |
| 1002 | chan->gain_data[i].num_points = |
| 1003 | (chan->gain_data[i - 1].num_points + delta) & 7; |
| 1004 | } |
| 1005 | } |
| 1006 | break; |
| 1007 | case 3: |
| 1008 | if (ch_num) { /* copy data from master channel */ |
| 1009 | for (i = 0; i < coded_subbands; i++) |
| 1010 | chan->gain_data[i].num_points = |
| 1011 | ref_chan->gain_data[i].num_points; |
| 1012 | } else { /* shorter delta to min */ |
| 1013 | delta_bits = get_bits(gb, 2); |
| 1014 | min_val = get_bits(gb, 3); |
| 1015 | |
| 1016 | for (i = 0; i < coded_subbands; i++) { |
| 1017 | chan->gain_data[i].num_points = min_val + GET_DELTA(gb, delta_bits); |
| 1018 | if (chan->gain_data[i].num_points > 7) |
| 1019 | return AVERROR_INVALIDDATA; |
| 1020 | } |
| 1021 | } |
| 1022 | } |
| 1023 | |
| 1024 | return 0; |
| 1025 | } |
| 1026 | |
| 1027 | /** |
| 1028 | * Implements coding mode 3 (slave) for gain compensation levels. |
| 1029 | * |
| 1030 | * @param[out] dst ptr to the output array |
| 1031 | * @param[in] ref ptr to the reference channel |
| 1032 | */ |
| 1033 | static inline void gainc_level_mode3s(AtracGainInfo *dst, AtracGainInfo *ref) |
| 1034 | { |
| 1035 | int i; |
| 1036 | |
| 1037 | for (i = 0; i < dst->num_points; i++) |
| 1038 | dst->lev_code[i] = (i >= ref->num_points) ? 7 : ref->lev_code[i]; |
| 1039 | } |
| 1040 | |
| 1041 | /** |
| 1042 | * Implements coding mode 1 (master) for gain compensation levels. |
| 1043 | * |
| 1044 | * @param[in] gb the GetBit context |
| 1045 | * @param[in] ctx ptr to the channel unit context |
| 1046 | * @param[out] dst ptr to the output array |
| 1047 | */ |
| 1048 | static inline void gainc_level_mode1m(GetBitContext *gb, |
| 1049 | Atrac3pChanUnitCtx *ctx, |
| 1050 | AtracGainInfo *dst) |
| 1051 | { |
| 1052 | int i, delta; |
| 1053 | |
| 1054 | if (dst->num_points > 0) |
| 1055 | dst->lev_code[0] = get_vlc2(gb, gain_vlc_tabs[2].table, |
| 1056 | gain_vlc_tabs[2].bits, 1); |
| 1057 | |
| 1058 | for (i = 1; i < dst->num_points; i++) { |
| 1059 | delta = get_vlc2(gb, gain_vlc_tabs[3].table, |
| 1060 | gain_vlc_tabs[3].bits, 1); |
| 1061 | dst->lev_code[i] = (dst->lev_code[i - 1] + delta) & 0xF; |
| 1062 | } |
| 1063 | } |
| 1064 | |
| 1065 | /** |
| 1066 | * Decode level code for each gain control point. |
| 1067 | * |
| 1068 | * @param[in] gb the GetBit context |
| 1069 | * @param[in,out] ctx ptr to the channel unit context |
| 1070 | * @param[in] ch_num channel to process |
| 1071 | * @param[in] coded_subbands number of subbands to process |
| 1072 | * @return result code: 0 = OK, otherwise - error code |
| 1073 | */ |
| 1074 | static int decode_gainc_levels(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| 1075 | int ch_num, int coded_subbands) |
| 1076 | { |
| 1077 | int sb, i, delta, delta_bits, min_val, pred; |
| 1078 | Atrac3pChanParams *chan = &ctx->channels[ch_num]; |
| 1079 | Atrac3pChanParams *ref_chan = &ctx->channels[0]; |
| 1080 | |
| 1081 | switch (get_bits(gb, 2)) { /* switch according to coding mode */ |
| 1082 | case 0: /* fixed-length coding */ |
| 1083 | for (sb = 0; sb < coded_subbands; sb++) |
| 1084 | for (i = 0; i < chan->gain_data[sb].num_points; i++) |
| 1085 | chan->gain_data[sb].lev_code[i] = get_bits(gb, 4); |
| 1086 | break; |
| 1087 | case 1: |
| 1088 | if (ch_num) { /* VLC modulo delta to master channel */ |
| 1089 | for (sb = 0; sb < coded_subbands; sb++) |
| 1090 | for (i = 0; i < chan->gain_data[sb].num_points; i++) { |
| 1091 | delta = get_vlc2(gb, gain_vlc_tabs[5].table, |
| 1092 | gain_vlc_tabs[5].bits, 1); |
| 1093 | pred = (i >= ref_chan->gain_data[sb].num_points) |
| 1094 | ? 7 : ref_chan->gain_data[sb].lev_code[i]; |
| 1095 | chan->gain_data[sb].lev_code[i] = (pred + delta) & 0xF; |
| 1096 | } |
| 1097 | } else { /* VLC modulo delta to previous */ |
| 1098 | for (sb = 0; sb < coded_subbands; sb++) |
| 1099 | gainc_level_mode1m(gb, ctx, &chan->gain_data[sb]); |
| 1100 | } |
| 1101 | break; |
| 1102 | case 2: |
| 1103 | if (ch_num) { /* VLC modulo delta to previous or clone master */ |
| 1104 | for (sb = 0; sb < coded_subbands; sb++) |
| 1105 | if (chan->gain_data[sb].num_points > 0) { |
| 1106 | if (get_bits1(gb)) |
| 1107 | gainc_level_mode1m(gb, ctx, &chan->gain_data[sb]); |
| 1108 | else |
| 1109 | gainc_level_mode3s(&chan->gain_data[sb], |
| 1110 | &ref_chan->gain_data[sb]); |
| 1111 | } |
| 1112 | } else { /* VLC modulo delta to lev_codes of previous subband */ |
| 1113 | if (chan->gain_data[0].num_points > 0) |
| 1114 | gainc_level_mode1m(gb, ctx, &chan->gain_data[0]); |
| 1115 | |
| 1116 | for (sb = 1; sb < coded_subbands; sb++) |
| 1117 | for (i = 0; i < chan->gain_data[sb].num_points; i++) { |
| 1118 | delta = get_vlc2(gb, gain_vlc_tabs[4].table, |
| 1119 | gain_vlc_tabs[4].bits, 1); |
| 1120 | pred = (i >= chan->gain_data[sb - 1].num_points) |
| 1121 | ? 7 : chan->gain_data[sb - 1].lev_code[i]; |
| 1122 | chan->gain_data[sb].lev_code[i] = (pred + delta) & 0xF; |
| 1123 | } |
| 1124 | } |
| 1125 | break; |
| 1126 | case 3: |
| 1127 | if (ch_num) { /* clone master */ |
| 1128 | for (sb = 0; sb < coded_subbands; sb++) |
| 1129 | gainc_level_mode3s(&chan->gain_data[sb], |
| 1130 | &ref_chan->gain_data[sb]); |
| 1131 | } else { /* shorter delta to min */ |
| 1132 | delta_bits = get_bits(gb, 2); |
| 1133 | min_val = get_bits(gb, 4); |
| 1134 | |
| 1135 | for (sb = 0; sb < coded_subbands; sb++) |
| 1136 | for (i = 0; i < chan->gain_data[sb].num_points; i++) { |
| 1137 | chan->gain_data[sb].lev_code[i] = min_val + GET_DELTA(gb, delta_bits); |
| 1138 | if (chan->gain_data[sb].lev_code[i] > 15) |
| 1139 | return AVERROR_INVALIDDATA; |
| 1140 | } |
| 1141 | } |
| 1142 | break; |
| 1143 | } |
| 1144 | |
| 1145 | return 0; |
| 1146 | } |
| 1147 | |
| 1148 | /** |
| 1149 | * Implements coding mode 0 for gain compensation locations. |
| 1150 | * |
| 1151 | * @param[in] gb the GetBit context |
| 1152 | * @param[in] ctx ptr to the channel unit context |
| 1153 | * @param[out] dst ptr to the output array |
| 1154 | * @param[in] pos position of the value to be processed |
| 1155 | */ |
| 1156 | static inline void gainc_loc_mode0(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| 1157 | AtracGainInfo *dst, int pos) |
| 1158 | { |
| 1159 | int delta_bits; |
| 1160 | |
| 1161 | if (!pos || dst->loc_code[pos - 1] < 15) |
| 1162 | dst->loc_code[pos] = get_bits(gb, 5); |
| 1163 | else if (dst->loc_code[pos - 1] >= 30) |
| 1164 | dst->loc_code[pos] = 31; |
| 1165 | else { |
| 1166 | delta_bits = av_log2(30 - dst->loc_code[pos - 1]) + 1; |
| 1167 | dst->loc_code[pos] = dst->loc_code[pos - 1] + |
| 1168 | get_bits(gb, delta_bits) + 1; |
| 1169 | } |
| 1170 | } |
| 1171 | |
| 1172 | /** |
| 1173 | * Implements coding mode 1 for gain compensation locations. |
| 1174 | * |
| 1175 | * @param[in] gb the GetBit context |
| 1176 | * @param[in] ctx ptr to the channel unit context |
| 1177 | * @param[out] dst ptr to the output array |
| 1178 | */ |
| 1179 | static inline void gainc_loc_mode1(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| 1180 | AtracGainInfo *dst) |
| 1181 | { |
| 1182 | int i; |
| 1183 | VLC *tab; |
| 1184 | |
| 1185 | if (dst->num_points > 0) { |
| 1186 | /* 1st coefficient is stored directly */ |
| 1187 | dst->loc_code[0] = get_bits(gb, 5); |
| 1188 | |
| 1189 | for (i = 1; i < dst->num_points; i++) { |
| 1190 | /* switch VLC according to the curve direction |
| 1191 | * (ascending/descending) */ |
| 1192 | tab = (dst->lev_code[i] <= dst->lev_code[i - 1]) |
| 1193 | ? &gain_vlc_tabs[7] |
| 1194 | : &gain_vlc_tabs[9]; |
| 1195 | dst->loc_code[i] = dst->loc_code[i - 1] + |
| 1196 | get_vlc2(gb, tab->table, tab->bits, 1); |
| 1197 | } |
| 1198 | } |
| 1199 | } |
| 1200 | |
| 1201 | /** |
| 1202 | * Decode location code for each gain control point. |
| 1203 | * |
| 1204 | * @param[in] gb the GetBit context |
| 1205 | * @param[in,out] ctx ptr to the channel unit context |
| 1206 | * @param[in] ch_num channel to process |
| 1207 | * @param[in] coded_subbands number of subbands to process |
| 1208 | * @param[in] avctx ptr to the AVCodecContext |
| 1209 | * @return result code: 0 = OK, otherwise - error code |
| 1210 | */ |
| 1211 | static int decode_gainc_loc_codes(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| 1212 | int ch_num, int coded_subbands, |
| 1213 | AVCodecContext *avctx) |
| 1214 | { |
| 1215 | int sb, i, delta, delta_bits, min_val, pred, more_than_ref; |
| 1216 | AtracGainInfo *dst, *ref; |
| 1217 | VLC *tab; |
| 1218 | Atrac3pChanParams *chan = &ctx->channels[ch_num]; |
| 1219 | Atrac3pChanParams *ref_chan = &ctx->channels[0]; |
| 1220 | |
| 1221 | switch (get_bits(gb, 2)) { /* switch according to coding mode */ |
| 1222 | case 0: /* sequence of numbers in ascending order */ |
| 1223 | for (sb = 0; sb < coded_subbands; sb++) |
| 1224 | for (i = 0; i < chan->gain_data[sb].num_points; i++) |
| 1225 | gainc_loc_mode0(gb, ctx, &chan->gain_data[sb], i); |
| 1226 | break; |
| 1227 | case 1: |
| 1228 | if (ch_num) { |
| 1229 | for (sb = 0; sb < coded_subbands; sb++) { |
| 1230 | if (chan->gain_data[sb].num_points <= 0) |
| 1231 | continue; |
| 1232 | dst = &chan->gain_data[sb]; |
| 1233 | ref = &ref_chan->gain_data[sb]; |
| 1234 | |
| 1235 | /* 1st value is vlc-coded modulo delta to master */ |
| 1236 | delta = get_vlc2(gb, gain_vlc_tabs[10].table, |
| 1237 | gain_vlc_tabs[10].bits, 1); |
| 1238 | pred = ref->num_points > 0 ? ref->loc_code[0] : 0; |
| 1239 | dst->loc_code[0] = (pred + delta) & 0x1F; |
| 1240 | |
| 1241 | for (i = 1; i < dst->num_points; i++) { |
| 1242 | more_than_ref = i >= ref->num_points; |
| 1243 | if (dst->lev_code[i] > dst->lev_code[i - 1]) { |
| 1244 | /* ascending curve */ |
| 1245 | if (more_than_ref) { |
| 1246 | delta = |
| 1247 | get_vlc2(gb, gain_vlc_tabs[9].table, |
| 1248 | gain_vlc_tabs[9].bits, 1); |
| 1249 | dst->loc_code[i] = dst->loc_code[i - 1] + delta; |
| 1250 | } else { |
| 1251 | if (get_bits1(gb)) |
| 1252 | gainc_loc_mode0(gb, ctx, dst, i); // direct coding |
| 1253 | else |
| 1254 | dst->loc_code[i] = ref->loc_code[i]; // clone master |
| 1255 | } |
| 1256 | } else { /* descending curve */ |
| 1257 | tab = more_than_ref ? &gain_vlc_tabs[7] |
| 1258 | : &gain_vlc_tabs[10]; |
| 1259 | delta = get_vlc2(gb, tab->table, tab->bits, 1); |
| 1260 | if (more_than_ref) |
| 1261 | dst->loc_code[i] = dst->loc_code[i - 1] + delta; |
| 1262 | else |
| 1263 | dst->loc_code[i] = (ref->loc_code[i] + delta) & 0x1F; |
| 1264 | } |
| 1265 | } |
| 1266 | } |
| 1267 | } else /* VLC delta to previous */ |
| 1268 | for (sb = 0; sb < coded_subbands; sb++) |
| 1269 | gainc_loc_mode1(gb, ctx, &chan->gain_data[sb]); |
| 1270 | break; |
| 1271 | case 2: |
| 1272 | if (ch_num) { |
| 1273 | for (sb = 0; sb < coded_subbands; sb++) { |
| 1274 | if (chan->gain_data[sb].num_points <= 0) |
| 1275 | continue; |
| 1276 | dst = &chan->gain_data[sb]; |
| 1277 | ref = &ref_chan->gain_data[sb]; |
| 1278 | if (dst->num_points > ref->num_points || get_bits1(gb)) |
| 1279 | gainc_loc_mode1(gb, ctx, dst); |
| 1280 | else /* clone master for the whole subband */ |
| 1281 | for (i = 0; i < chan->gain_data[sb].num_points; i++) |
| 1282 | dst->loc_code[i] = ref->loc_code[i]; |
| 1283 | } |
| 1284 | } else { |
| 1285 | /* data for the first subband is coded directly */ |
| 1286 | for (i = 0; i < chan->gain_data[0].num_points; i++) |
| 1287 | gainc_loc_mode0(gb, ctx, &chan->gain_data[0], i); |
| 1288 | |
| 1289 | for (sb = 1; sb < coded_subbands; sb++) { |
| 1290 | if (chan->gain_data[sb].num_points <= 0) |
| 1291 | continue; |
| 1292 | dst = &chan->gain_data[sb]; |
| 1293 | |
| 1294 | /* 1st value is vlc-coded modulo delta to the corresponding |
| 1295 | * value of the previous subband if any or zero */ |
| 1296 | delta = get_vlc2(gb, gain_vlc_tabs[6].table, |
| 1297 | gain_vlc_tabs[6].bits, 1); |
| 1298 | pred = dst[-1].num_points > 0 |
| 1299 | ? dst[-1].loc_code[0] : 0; |
| 1300 | dst->loc_code[0] = (pred + delta) & 0x1F; |
| 1301 | |
| 1302 | for (i = 1; i < dst->num_points; i++) { |
| 1303 | more_than_ref = i >= dst[-1].num_points; |
| 1304 | /* Select VLC table according to curve direction and |
| 1305 | * presence of prediction. */ |
| 1306 | tab = &gain_vlc_tabs[(dst->lev_code[i] > dst->lev_code[i - 1]) * |
| 1307 | 2 + more_than_ref + 6]; |
| 1308 | delta = get_vlc2(gb, tab->table, tab->bits, 1); |
| 1309 | if (more_than_ref) |
| 1310 | dst->loc_code[i] = dst->loc_code[i - 1] + delta; |
| 1311 | else |
| 1312 | dst->loc_code[i] = (dst[-1].loc_code[i] + delta) & 0x1F; |
| 1313 | } |
| 1314 | } |
| 1315 | } |
| 1316 | break; |
| 1317 | case 3: |
| 1318 | if (ch_num) { /* clone master or direct or direct coding */ |
| 1319 | for (sb = 0; sb < coded_subbands; sb++) |
| 1320 | for (i = 0; i < chan->gain_data[sb].num_points; i++) { |
| 1321 | if (i >= ref_chan->gain_data[sb].num_points) |
| 1322 | gainc_loc_mode0(gb, ctx, &chan->gain_data[sb], i); |
| 1323 | else |
| 1324 | chan->gain_data[sb].loc_code[i] = |
| 1325 | ref_chan->gain_data[sb].loc_code[i]; |
| 1326 | } |
| 1327 | } else { /* shorter delta to min */ |
| 1328 | delta_bits = get_bits(gb, 2) + 1; |
| 1329 | min_val = get_bits(gb, 5); |
| 1330 | |
| 1331 | for (sb = 0; sb < coded_subbands; sb++) |
| 1332 | for (i = 0; i < chan->gain_data[sb].num_points; i++) |
| 1333 | chan->gain_data[sb].loc_code[i] = min_val + i + |
| 1334 | get_bits(gb, delta_bits); |
| 1335 | } |
| 1336 | break; |
| 1337 | } |
| 1338 | |
| 1339 | /* Validate decoded information */ |
| 1340 | for (sb = 0; sb < coded_subbands; sb++) { |
| 1341 | dst = &chan->gain_data[sb]; |
| 1342 | for (i = 0; i < chan->gain_data[sb].num_points; i++) { |
| 1343 | if (dst->loc_code[i] < 0 || dst->loc_code[i] > 31 || |
| 1344 | (i && dst->loc_code[i] <= dst->loc_code[i - 1])) { |
| 1345 | av_log(avctx, AV_LOG_ERROR, |
| 1346 | "Invalid gain location: ch=%d, sb=%d, pos=%d, val=%d\n", |
| 1347 | ch_num, sb, i, dst->loc_code[i]); |
| 1348 | return AVERROR_INVALIDDATA; |
| 1349 | } |
| 1350 | } |
| 1351 | } |
| 1352 | |
| 1353 | return 0; |
| 1354 | } |
| 1355 | |
| 1356 | /** |
| 1357 | * Decode gain control data for all channels. |
| 1358 | * |
| 1359 | * @param[in] gb the GetBit context |
| 1360 | * @param[in,out] ctx ptr to the channel unit context |
| 1361 | * @param[in] num_channels number of channels to process |
| 1362 | * @param[in] avctx ptr to the AVCodecContext |
| 1363 | * @return result code: 0 = OK, otherwise - error code |
| 1364 | */ |
| 1365 | static int decode_gainc_data(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| 1366 | int num_channels, AVCodecContext *avctx) |
| 1367 | { |
| 1368 | int ch_num, coded_subbands, sb, ret; |
| 1369 | |
| 1370 | for (ch_num = 0; ch_num < num_channels; ch_num++) { |
| 1371 | memset(ctx->channels[ch_num].gain_data, 0, |
| 1372 | sizeof(*ctx->channels[ch_num].gain_data) * ATRAC3P_SUBBANDS); |
| 1373 | |
| 1374 | if (get_bits1(gb)) { /* gain control data present? */ |
| 1375 | coded_subbands = get_bits(gb, 4) + 1; |
| 1376 | if (get_bits1(gb)) /* is high band gain data replication on? */ |
| 1377 | ctx->channels[ch_num].num_gain_subbands = get_bits(gb, 4) + 1; |
| 1378 | else |
| 1379 | ctx->channels[ch_num].num_gain_subbands = coded_subbands; |
| 1380 | |
| 1381 | if ((ret = decode_gainc_npoints(gb, ctx, ch_num, coded_subbands)) < 0 || |
| 1382 | (ret = decode_gainc_levels(gb, ctx, ch_num, coded_subbands)) < 0 || |
| 1383 | (ret = decode_gainc_loc_codes(gb, ctx, ch_num, coded_subbands, avctx)) < 0) |
| 1384 | return ret; |
| 1385 | |
| 1386 | if (coded_subbands > 0) { /* propagate gain data if requested */ |
| 1387 | for (sb = coded_subbands; sb < ctx->channels[ch_num].num_gain_subbands; sb++) |
| 1388 | ctx->channels[ch_num].gain_data[sb] = |
| 1389 | ctx->channels[ch_num].gain_data[sb - 1]; |
| 1390 | } |
| 1391 | } else { |
| 1392 | ctx->channels[ch_num].num_gain_subbands = 0; |
| 1393 | } |
| 1394 | } |
| 1395 | |
| 1396 | return 0; |
| 1397 | } |
| 1398 | |
| 1399 | /** |
| 1400 | * Decode envelope for all tones of a channel. |
| 1401 | * |
| 1402 | * @param[in] gb the GetBit context |
| 1403 | * @param[in,out] ctx ptr to the channel unit context |
| 1404 | * @param[in] ch_num channel to process |
| 1405 | * @param[in] band_has_tones ptr to an array of per-band-flags: |
| 1406 | * 1 - tone data present |
| 1407 | */ |
| 1408 | static void decode_tones_envelope(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| 1409 | int ch_num, int band_has_tones[]) |
| 1410 | { |
| 1411 | int sb; |
| 1412 | Atrac3pWavesData *dst = ctx->channels[ch_num].tones_info; |
| 1413 | Atrac3pWavesData *ref = ctx->channels[0].tones_info; |
| 1414 | |
| 1415 | if (!ch_num || !get_bits1(gb)) { /* mode 0: fixed-length coding */ |
| 1416 | for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) { |
| 1417 | if (!band_has_tones[sb]) |
| 1418 | continue; |
| 1419 | dst[sb].pend_env.has_start_point = get_bits1(gb); |
| 1420 | dst[sb].pend_env.start_pos = dst[sb].pend_env.has_start_point |
| 1421 | ? get_bits(gb, 5) : -1; |
| 1422 | dst[sb].pend_env.has_stop_point = get_bits1(gb); |
| 1423 | dst[sb].pend_env.stop_pos = dst[sb].pend_env.has_stop_point |
| 1424 | ? get_bits(gb, 5) : 32; |
| 1425 | } |
| 1426 | } else { /* mode 1(slave only): copy master */ |
| 1427 | for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) { |
| 1428 | if (!band_has_tones[sb]) |
| 1429 | continue; |
| 1430 | dst[sb].pend_env.has_start_point = ref[sb].pend_env.has_start_point; |
| 1431 | dst[sb].pend_env.has_stop_point = ref[sb].pend_env.has_stop_point; |
| 1432 | dst[sb].pend_env.start_pos = ref[sb].pend_env.start_pos; |
| 1433 | dst[sb].pend_env.stop_pos = ref[sb].pend_env.stop_pos; |
| 1434 | } |
| 1435 | } |
| 1436 | } |
| 1437 | |
| 1438 | /** |
| 1439 | * Decode number of tones for each subband of a channel. |
| 1440 | * |
| 1441 | * @param[in] gb the GetBit context |
| 1442 | * @param[in,out] ctx ptr to the channel unit context |
| 1443 | * @param[in] ch_num channel to process |
| 1444 | * @param[in] band_has_tones ptr to an array of per-band-flags: |
| 1445 | * 1 - tone data present |
| 1446 | * @param[in] avctx ptr to the AVCodecContext |
| 1447 | * @return result code: 0 = OK, otherwise - error code |
| 1448 | */ |
| 1449 | static int decode_band_numwavs(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| 1450 | int ch_num, int band_has_tones[], |
| 1451 | AVCodecContext *avctx) |
| 1452 | { |
| 1453 | int mode, sb, delta; |
| 1454 | Atrac3pWavesData *dst = ctx->channels[ch_num].tones_info; |
| 1455 | Atrac3pWavesData *ref = ctx->channels[0].tones_info; |
| 1456 | |
| 1457 | mode = get_bits(gb, ch_num + 1); |
| 1458 | switch (mode) { |
| 1459 | case 0: /** fixed-length coding */ |
| 1460 | for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) |
| 1461 | if (band_has_tones[sb]) |
| 1462 | dst[sb].num_wavs = get_bits(gb, 4); |
| 1463 | break; |
| 1464 | case 1: /** variable-length coding */ |
| 1465 | for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) |
| 1466 | if (band_has_tones[sb]) |
| 1467 | dst[sb].num_wavs = |
| 1468 | get_vlc2(gb, tone_vlc_tabs[1].table, |
| 1469 | tone_vlc_tabs[1].bits, 1); |
| 1470 | break; |
| 1471 | case 2: /** VLC modulo delta to master (slave only) */ |
| 1472 | for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) |
| 1473 | if (band_has_tones[sb]) { |
| 1474 | delta = get_vlc2(gb, tone_vlc_tabs[2].table, |
| 1475 | tone_vlc_tabs[2].bits, 1); |
| 1476 | delta = sign_extend(delta, 3); |
| 1477 | dst[sb].num_wavs = (ref[sb].num_wavs + delta) & 0xF; |
| 1478 | } |
| 1479 | break; |
| 1480 | case 3: /** copy master (slave only) */ |
| 1481 | for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) |
| 1482 | if (band_has_tones[sb]) |
| 1483 | dst[sb].num_wavs = ref[sb].num_wavs; |
| 1484 | break; |
| 1485 | } |
| 1486 | |
| 1487 | /** initialize start tone index for each subband */ |
| 1488 | for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) |
| 1489 | if (band_has_tones[sb]) { |
| 1490 | if (ctx->waves_info->tones_index + dst[sb].num_wavs > 48) { |
| 1491 | av_log(avctx, AV_LOG_ERROR, |
| 1492 | "Too many tones: %d (max. 48), frame: %d!\n", |
| 1493 | ctx->waves_info->tones_index + dst[sb].num_wavs, |
| 1494 | avctx->frame_number); |
| 1495 | return AVERROR_INVALIDDATA; |
| 1496 | } |
| 1497 | dst[sb].start_index = ctx->waves_info->tones_index; |
| 1498 | ctx->waves_info->tones_index += dst[sb].num_wavs; |
| 1499 | } |
| 1500 | |
| 1501 | return 0; |
| 1502 | } |
| 1503 | |
| 1504 | /** |
| 1505 | * Decode frequency information for each subband of a channel. |
| 1506 | * |
| 1507 | * @param[in] gb the GetBit context |
| 1508 | * @param[in,out] ctx ptr to the channel unit context |
| 1509 | * @param[in] ch_num channel to process |
| 1510 | * @param[in] band_has_tones ptr to an array of per-band-flags: |
| 1511 | * 1 - tone data present |
| 1512 | */ |
| 1513 | static void decode_tones_frequency(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| 1514 | int ch_num, int band_has_tones[]) |
| 1515 | { |
| 1516 | int sb, i, direction, nbits, pred, delta; |
| 1517 | Atrac3pWaveParam *iwav, *owav; |
| 1518 | Atrac3pWavesData *dst = ctx->channels[ch_num].tones_info; |
| 1519 | Atrac3pWavesData *ref = ctx->channels[0].tones_info; |
| 1520 | |
| 1521 | if (!ch_num || !get_bits1(gb)) { /* mode 0: fixed-length coding */ |
| 1522 | for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) { |
| 1523 | if (!band_has_tones[sb] || !dst[sb].num_wavs) |
| 1524 | continue; |
| 1525 | iwav = &ctx->waves_info->waves[dst[sb].start_index]; |
| 1526 | direction = (dst[sb].num_wavs > 1) ? get_bits1(gb) : 0; |
| 1527 | if (direction) { /** packed numbers in descending order */ |
| 1528 | if (dst[sb].num_wavs) |
| 1529 | iwav[dst[sb].num_wavs - 1].freq_index = get_bits(gb, 10); |
| 1530 | for (i = dst[sb].num_wavs - 2; i >= 0 ; i--) { |
| 1531 | nbits = av_log2(iwav[i+1].freq_index) + 1; |
| 1532 | iwav[i].freq_index = get_bits(gb, nbits); |
| 1533 | } |
| 1534 | } else { /** packed numbers in ascending order */ |
| 1535 | for (i = 0; i < dst[sb].num_wavs; i++) { |
| 1536 | if (!i || iwav[i - 1].freq_index < 512) |
| 1537 | iwav[i].freq_index = get_bits(gb, 10); |
| 1538 | else { |
| 1539 | nbits = av_log2(1023 - iwav[i - 1].freq_index) + 1; |
| 1540 | iwav[i].freq_index = get_bits(gb, nbits) + |
| 1541 | 1024 - (1 << nbits); |
| 1542 | } |
| 1543 | } |
| 1544 | } |
| 1545 | } |
| 1546 | } else { /* mode 1: VLC modulo delta to master (slave only) */ |
| 1547 | for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) { |
| 1548 | if (!band_has_tones[sb] || !dst[sb].num_wavs) |
| 1549 | continue; |
| 1550 | iwav = &ctx->waves_info->waves[ref[sb].start_index]; |
| 1551 | owav = &ctx->waves_info->waves[dst[sb].start_index]; |
| 1552 | for (i = 0; i < dst[sb].num_wavs; i++) { |
| 1553 | delta = get_vlc2(gb, tone_vlc_tabs[6].table, |
| 1554 | tone_vlc_tabs[6].bits, 1); |
| 1555 | delta = sign_extend(delta, 8); |
| 1556 | pred = (i < ref[sb].num_wavs) ? iwav[i].freq_index : |
| 1557 | (ref[sb].num_wavs ? iwav[ref[sb].num_wavs - 1].freq_index : 0); |
| 1558 | owav[i].freq_index = (pred + delta) & 0x3FF; |
| 1559 | } |
| 1560 | } |
| 1561 | } |
| 1562 | } |
| 1563 | |
| 1564 | /** |
| 1565 | * Decode amplitude information for each subband of a channel. |
| 1566 | * |
| 1567 | * @param[in] gb the GetBit context |
| 1568 | * @param[in,out] ctx ptr to the channel unit context |
| 1569 | * @param[in] ch_num channel to process |
| 1570 | * @param[in] band_has_tones ptr to an array of per-band-flags: |
| 1571 | * 1 - tone data present |
| 1572 | */ |
| 1573 | static void decode_tones_amplitude(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| 1574 | int ch_num, int band_has_tones[]) |
| 1575 | { |
| 1576 | int mode, sb, j, i, diff, maxdiff, fi, delta, pred; |
| 1577 | Atrac3pWaveParam *wsrc, *wref; |
| 1578 | int refwaves[48]; |
| 1579 | Atrac3pWavesData *dst = ctx->channels[ch_num].tones_info; |
| 1580 | Atrac3pWavesData *ref = ctx->channels[0].tones_info; |
| 1581 | |
| 1582 | if (ch_num) { |
| 1583 | for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) { |
| 1584 | if (!band_has_tones[sb] || !dst[sb].num_wavs) |
| 1585 | continue; |
| 1586 | wsrc = &ctx->waves_info->waves[dst[sb].start_index]; |
| 1587 | wref = &ctx->waves_info->waves[ref[sb].start_index]; |
| 1588 | for (j = 0; j < dst[sb].num_wavs; j++) { |
| 1589 | for (i = 0, fi = 0, maxdiff = 1024; i < ref[sb].num_wavs; i++) { |
| 1590 | diff = FFABS(wsrc[j].freq_index - wref[i].freq_index); |
| 1591 | if (diff < maxdiff) { |
| 1592 | maxdiff = diff; |
| 1593 | fi = i; |
| 1594 | } |
| 1595 | } |
| 1596 | |
| 1597 | if (maxdiff < 8) |
| 1598 | refwaves[dst[sb].start_index + j] = fi + ref[sb].start_index; |
| 1599 | else if (j < ref[sb].num_wavs) |
| 1600 | refwaves[dst[sb].start_index + j] = j + ref[sb].start_index; |
| 1601 | else |
| 1602 | refwaves[dst[sb].start_index + j] = -1; |
| 1603 | } |
| 1604 | } |
| 1605 | } |
| 1606 | |
| 1607 | mode = get_bits(gb, ch_num + 1); |
| 1608 | |
| 1609 | switch (mode) { |
| 1610 | case 0: /** fixed-length coding */ |
| 1611 | for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) { |
| 1612 | if (!band_has_tones[sb] || !dst[sb].num_wavs) |
| 1613 | continue; |
| 1614 | if (ctx->waves_info->amplitude_mode) |
| 1615 | for (i = 0; i < dst[sb].num_wavs; i++) |
| 1616 | ctx->waves_info->waves[dst[sb].start_index + i].amp_sf = get_bits(gb, 6); |
| 1617 | else |
| 1618 | ctx->waves_info->waves[dst[sb].start_index].amp_sf = get_bits(gb, 6); |
| 1619 | } |
| 1620 | break; |
| 1621 | case 1: /** min + VLC delta */ |
| 1622 | for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) { |
| 1623 | if (!band_has_tones[sb] || !dst[sb].num_wavs) |
| 1624 | continue; |
| 1625 | if (ctx->waves_info->amplitude_mode) |
| 1626 | for (i = 0; i < dst[sb].num_wavs; i++) |
| 1627 | ctx->waves_info->waves[dst[sb].start_index + i].amp_sf = |
| 1628 | get_vlc2(gb, tone_vlc_tabs[3].table, |
| 1629 | tone_vlc_tabs[3].bits, 1) + 20; |
| 1630 | else |
| 1631 | ctx->waves_info->waves[dst[sb].start_index].amp_sf = |
| 1632 | get_vlc2(gb, tone_vlc_tabs[4].table, |
| 1633 | tone_vlc_tabs[4].bits, 1) + 24; |
| 1634 | } |
| 1635 | break; |
| 1636 | case 2: /** VLC modulo delta to master (slave only) */ |
| 1637 | for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) { |
| 1638 | if (!band_has_tones[sb] || !dst[sb].num_wavs) |
| 1639 | continue; |
| 1640 | for (i = 0; i < dst[sb].num_wavs; i++) { |
| 1641 | delta = get_vlc2(gb, tone_vlc_tabs[5].table, |
| 1642 | tone_vlc_tabs[5].bits, 1); |
| 1643 | delta = sign_extend(delta, 5); |
| 1644 | pred = refwaves[dst[sb].start_index + i] >= 0 ? |
| 1645 | ctx->waves_info->waves[refwaves[dst[sb].start_index + i]].amp_sf : 34; |
| 1646 | ctx->waves_info->waves[dst[sb].start_index + i].amp_sf = (pred + delta) & 0x3F; |
| 1647 | } |
| 1648 | } |
| 1649 | break; |
| 1650 | case 3: /** clone master (slave only) */ |
| 1651 | for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) { |
| 1652 | if (!band_has_tones[sb]) |
| 1653 | continue; |
| 1654 | for (i = 0; i < dst[sb].num_wavs; i++) |
| 1655 | ctx->waves_info->waves[dst[sb].start_index + i].amp_sf = |
| 1656 | refwaves[dst[sb].start_index + i] >= 0 |
| 1657 | ? ctx->waves_info->waves[refwaves[dst[sb].start_index + i]].amp_sf |
| 1658 | : 32; |
| 1659 | } |
| 1660 | break; |
| 1661 | } |
| 1662 | } |
| 1663 | |
| 1664 | /** |
| 1665 | * Decode phase information for each subband of a channel. |
| 1666 | * |
| 1667 | * @param[in] gb the GetBit context |
| 1668 | * @param[in,out] ctx ptr to the channel unit context |
| 1669 | * @param[in] ch_num channel to process |
| 1670 | * @param[in] band_has_tones ptr to an array of per-band-flags: |
| 1671 | * 1 - tone data present |
| 1672 | */ |
| 1673 | static void decode_tones_phase(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| 1674 | int ch_num, int band_has_tones[]) |
| 1675 | { |
| 1676 | int sb, i; |
| 1677 | Atrac3pWaveParam *wparam; |
| 1678 | Atrac3pWavesData *dst = ctx->channels[ch_num].tones_info; |
| 1679 | |
| 1680 | for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) { |
| 1681 | if (!band_has_tones[sb]) |
| 1682 | continue; |
| 1683 | wparam = &ctx->waves_info->waves[dst[sb].start_index]; |
| 1684 | for (i = 0; i < dst[sb].num_wavs; i++) |
| 1685 | wparam[i].phase_index = get_bits(gb, 5); |
| 1686 | } |
| 1687 | } |
| 1688 | |
| 1689 | /** |
| 1690 | * Decode tones info for all channels. |
| 1691 | * |
| 1692 | * @param[in] gb the GetBit context |
| 1693 | * @param[in,out] ctx ptr to the channel unit context |
| 1694 | * @param[in] num_channels number of channels to process |
| 1695 | * @param[in] avctx ptr to the AVCodecContext |
| 1696 | * @return result code: 0 = OK, otherwise - error code |
| 1697 | */ |
| 1698 | static int decode_tones_info(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| 1699 | int num_channels, AVCodecContext *avctx) |
| 1700 | { |
| 1701 | int ch_num, i, ret; |
| 1702 | int band_has_tones[16]; |
| 1703 | |
| 1704 | for (ch_num = 0; ch_num < num_channels; ch_num++) |
| 1705 | memset(ctx->channels[ch_num].tones_info, 0, |
| 1706 | sizeof(*ctx->channels[ch_num].tones_info) * ATRAC3P_SUBBANDS); |
| 1707 | |
| 1708 | ctx->waves_info->tones_present = get_bits1(gb); |
| 1709 | if (!ctx->waves_info->tones_present) |
| 1710 | return 0; |
| 1711 | |
| 1712 | memset(ctx->waves_info->waves, 0, sizeof(ctx->waves_info->waves)); |
| 1713 | |
| 1714 | ctx->waves_info->amplitude_mode = get_bits1(gb); |
| 1715 | if (!ctx->waves_info->amplitude_mode) { |
| 1716 | avpriv_report_missing_feature(avctx, "GHA amplitude mode 0"); |
| 1717 | return AVERROR_PATCHWELCOME; |
| 1718 | } |
| 1719 | |
| 1720 | ctx->waves_info->num_tone_bands = |
| 1721 | get_vlc2(gb, tone_vlc_tabs[0].table, |
| 1722 | tone_vlc_tabs[0].bits, 1) + 1; |
| 1723 | |
| 1724 | if (num_channels == 2) { |
| 1725 | get_subband_flags(gb, ctx->waves_info->tone_sharing, ctx->waves_info->num_tone_bands); |
| 1726 | get_subband_flags(gb, ctx->waves_info->tone_master, ctx->waves_info->num_tone_bands); |
| 1727 | if (get_subband_flags(gb, ctx->waves_info->phase_shift, |
| 1728 | ctx->waves_info->num_tone_bands)) { |
| 1729 | avpriv_report_missing_feature(avctx, "GHA Phase shifting"); |
| 1730 | return AVERROR_PATCHWELCOME; |
| 1731 | } |
| 1732 | } |
| 1733 | |
| 1734 | ctx->waves_info->tones_index = 0; |
| 1735 | |
| 1736 | for (ch_num = 0; ch_num < num_channels; ch_num++) { |
| 1737 | for (i = 0; i < ctx->waves_info->num_tone_bands; i++) |
| 1738 | band_has_tones[i] = !ch_num ? 1 : !ctx->waves_info->tone_sharing[i]; |
| 1739 | |
| 1740 | decode_tones_envelope(gb, ctx, ch_num, band_has_tones); |
| 1741 | if ((ret = decode_band_numwavs(gb, ctx, ch_num, band_has_tones, |
| 1742 | avctx)) < 0) |
| 1743 | return ret; |
| 1744 | |
| 1745 | decode_tones_frequency(gb, ctx, ch_num, band_has_tones); |
| 1746 | decode_tones_amplitude(gb, ctx, ch_num, band_has_tones); |
| 1747 | decode_tones_phase(gb, ctx, ch_num, band_has_tones); |
| 1748 | } |
| 1749 | |
| 1750 | if (num_channels == 2) { |
| 1751 | for (i = 0; i < ctx->waves_info->num_tone_bands; i++) { |
| 1752 | if (ctx->waves_info->tone_sharing[i]) |
| 1753 | ctx->channels[1].tones_info[i] = ctx->channels[0].tones_info[i]; |
| 1754 | |
| 1755 | if (ctx->waves_info->tone_master[i]) |
| 1756 | FFSWAP(Atrac3pWavesData, ctx->channels[0].tones_info[i], |
| 1757 | ctx->channels[1].tones_info[i]); |
| 1758 | } |
| 1759 | } |
| 1760 | |
| 1761 | return 0; |
| 1762 | } |
| 1763 | |
| 1764 | int ff_atrac3p_decode_channel_unit(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| 1765 | int num_channels, AVCodecContext *avctx) |
| 1766 | { |
| 1767 | int ret; |
| 1768 | |
| 1769 | /* parse sound header */ |
| 1770 | ctx->num_quant_units = get_bits(gb, 5) + 1; |
| 1771 | if (ctx->num_quant_units > 28 && ctx->num_quant_units < 32) { |
| 1772 | av_log(avctx, AV_LOG_ERROR, |
| 1773 | "Invalid number of quantization units: %d!\n", |
| 1774 | ctx->num_quant_units); |
| 1775 | return AVERROR_INVALIDDATA; |
| 1776 | } |
| 1777 | |
| 1778 | ctx->mute_flag = get_bits1(gb); |
| 1779 | |
| 1780 | /* decode various sound parameters */ |
| 1781 | if ((ret = decode_quant_wordlen(gb, ctx, num_channels, avctx)) < 0) |
| 1782 | return ret; |
| 1783 | |
| 1784 | ctx->num_subbands = atrac3p_qu_to_subband[ctx->num_quant_units - 1] + 1; |
| 1785 | ctx->num_coded_subbands = ctx->used_quant_units |
| 1786 | ? atrac3p_qu_to_subband[ctx->used_quant_units - 1] + 1 |
| 1787 | : 0; |
| 1788 | |
| 1789 | if ((ret = decode_scale_factors(gb, ctx, num_channels, avctx)) < 0) |
| 1790 | return ret; |
| 1791 | |
| 1792 | if ((ret = decode_code_table_indexes(gb, ctx, num_channels, avctx)) < 0) |
| 1793 | return ret; |
| 1794 | |
| 1795 | decode_spectrum(gb, ctx, num_channels, avctx); |
| 1796 | |
| 1797 | if (num_channels == 2) { |
| 1798 | get_subband_flags(gb, ctx->swap_channels, ctx->num_coded_subbands); |
| 1799 | get_subband_flags(gb, ctx->negate_coeffs, ctx->num_coded_subbands); |
| 1800 | } |
| 1801 | |
| 1802 | decode_window_shape(gb, ctx, num_channels); |
| 1803 | |
| 1804 | if ((ret = decode_gainc_data(gb, ctx, num_channels, avctx)) < 0) |
| 1805 | return ret; |
| 1806 | |
| 1807 | if ((ret = decode_tones_info(gb, ctx, num_channels, avctx)) < 0) |
| 1808 | return ret; |
| 1809 | |
| 1810 | /* decode global noise info */ |
| 1811 | ctx->noise_present = get_bits1(gb); |
| 1812 | if (ctx->noise_present) { |
| 1813 | ctx->noise_level_index = get_bits(gb, 4); |
| 1814 | ctx->noise_table_index = get_bits(gb, 4); |
| 1815 | } |
| 1816 | |
| 1817 | return 0; |
| 1818 | } |