| 1 | /* |
| 2 | * IMC compatible decoder |
| 3 | * Copyright (c) 2002-2004 Maxim Poliakovski |
| 4 | * Copyright (c) 2006 Benjamin Larsson |
| 5 | * Copyright (c) 2006 Konstantin Shishkov |
| 6 | * |
| 7 | * This file is part of FFmpeg. |
| 8 | * |
| 9 | * FFmpeg is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU Lesser General Public |
| 11 | * License as published by the Free Software Foundation; either |
| 12 | * version 2.1 of the License, or (at your option) any later version. |
| 13 | * |
| 14 | * FFmpeg is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | * Lesser General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Lesser General Public |
| 20 | * License along with FFmpeg; if not, write to the Free Software |
| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 22 | */ |
| 23 | |
| 24 | /** |
| 25 | * @file |
| 26 | * IMC - Intel Music Coder |
| 27 | * A mdct based codec using a 256 points large transform |
| 28 | * divided into 32 bands with some mix of scale factors. |
| 29 | * Only mono is supported. |
| 30 | * |
| 31 | */ |
| 32 | |
| 33 | |
| 34 | #include <math.h> |
| 35 | #include <stddef.h> |
| 36 | #include <stdio.h> |
| 37 | |
| 38 | #include "libavutil/channel_layout.h" |
| 39 | #include "libavutil/float_dsp.h" |
| 40 | #include "libavutil/internal.h" |
| 41 | #include "libavutil/libm.h" |
| 42 | #include "avcodec.h" |
| 43 | #include "bswapdsp.h" |
| 44 | #include "get_bits.h" |
| 45 | #include "fft.h" |
| 46 | #include "internal.h" |
| 47 | #include "sinewin.h" |
| 48 | |
| 49 | #include "imcdata.h" |
| 50 | |
| 51 | #define IMC_BLOCK_SIZE 64 |
| 52 | #define IMC_FRAME_ID 0x21 |
| 53 | #define BANDS 32 |
| 54 | #define COEFFS 256 |
| 55 | |
| 56 | typedef struct IMCChannel { |
| 57 | float old_floor[BANDS]; |
| 58 | float flcoeffs1[BANDS]; |
| 59 | float flcoeffs2[BANDS]; |
| 60 | float flcoeffs3[BANDS]; |
| 61 | float flcoeffs4[BANDS]; |
| 62 | float flcoeffs5[BANDS]; |
| 63 | float flcoeffs6[BANDS]; |
| 64 | float CWdecoded[COEFFS]; |
| 65 | |
| 66 | int bandWidthT[BANDS]; ///< codewords per band |
| 67 | int bitsBandT[BANDS]; ///< how many bits per codeword in band |
| 68 | int CWlengthT[COEFFS]; ///< how many bits in each codeword |
| 69 | int levlCoeffBuf[BANDS]; |
| 70 | int bandFlagsBuf[BANDS]; ///< flags for each band |
| 71 | int sumLenArr[BANDS]; ///< bits for all coeffs in band |
| 72 | int skipFlagRaw[BANDS]; ///< skip flags are stored in raw form or not |
| 73 | int skipFlagBits[BANDS]; ///< bits used to code skip flags |
| 74 | int skipFlagCount[BANDS]; ///< skipped coeffients per band |
| 75 | int skipFlags[COEFFS]; ///< skip coefficient decoding or not |
| 76 | int codewords[COEFFS]; ///< raw codewords read from bitstream |
| 77 | |
| 78 | float last_fft_im[COEFFS]; |
| 79 | |
| 80 | int decoder_reset; |
| 81 | } IMCChannel; |
| 82 | |
| 83 | typedef struct { |
| 84 | IMCChannel chctx[2]; |
| 85 | |
| 86 | /** MDCT tables */ |
| 87 | //@{ |
| 88 | float mdct_sine_window[COEFFS]; |
| 89 | float post_cos[COEFFS]; |
| 90 | float post_sin[COEFFS]; |
| 91 | float pre_coef1[COEFFS]; |
| 92 | float pre_coef2[COEFFS]; |
| 93 | //@} |
| 94 | |
| 95 | float sqrt_tab[30]; |
| 96 | GetBitContext gb; |
| 97 | |
| 98 | BswapDSPContext bdsp; |
| 99 | AVFloatDSPContext fdsp; |
| 100 | FFTContext fft; |
| 101 | DECLARE_ALIGNED(32, FFTComplex, samples)[COEFFS / 2]; |
| 102 | float *out_samples; |
| 103 | |
| 104 | int coef0_pos; |
| 105 | |
| 106 | int8_t cyclTab[32], cyclTab2[32]; |
| 107 | float weights1[31], weights2[31]; |
| 108 | } IMCContext; |
| 109 | |
| 110 | static VLC huffman_vlc[4][4]; |
| 111 | |
| 112 | #define VLC_TABLES_SIZE 9512 |
| 113 | |
| 114 | static const int vlc_offsets[17] = { |
| 115 | 0, 640, 1156, 1732, 2308, 2852, 3396, 3924, |
| 116 | 4452, 5220, 5860, 6628, 7268, 7908, 8424, 8936, VLC_TABLES_SIZE |
| 117 | }; |
| 118 | |
| 119 | static VLC_TYPE vlc_tables[VLC_TABLES_SIZE][2]; |
| 120 | |
| 121 | static inline double freq2bark(double freq) |
| 122 | { |
| 123 | return 3.5 * atan((freq / 7500.0) * (freq / 7500.0)) + 13.0 * atan(freq * 0.00076); |
| 124 | } |
| 125 | |
| 126 | static av_cold void iac_generate_tabs(IMCContext *q, int sampling_rate) |
| 127 | { |
| 128 | double freqmin[32], freqmid[32], freqmax[32]; |
| 129 | double scale = sampling_rate / (256.0 * 2.0 * 2.0); |
| 130 | double nyquist_freq = sampling_rate * 0.5; |
| 131 | double freq, bark, prev_bark = 0, tf, tb; |
| 132 | int i, j; |
| 133 | |
| 134 | for (i = 0; i < 32; i++) { |
| 135 | freq = (band_tab[i] + band_tab[i + 1] - 1) * scale; |
| 136 | bark = freq2bark(freq); |
| 137 | |
| 138 | if (i > 0) { |
| 139 | tb = bark - prev_bark; |
| 140 | q->weights1[i - 1] = pow(10.0, -1.0 * tb); |
| 141 | q->weights2[i - 1] = pow(10.0, -2.7 * tb); |
| 142 | } |
| 143 | prev_bark = bark; |
| 144 | |
| 145 | freqmid[i] = freq; |
| 146 | |
| 147 | tf = freq; |
| 148 | while (tf < nyquist_freq) { |
| 149 | tf += 0.5; |
| 150 | tb = freq2bark(tf); |
| 151 | if (tb > bark + 0.5) |
| 152 | break; |
| 153 | } |
| 154 | freqmax[i] = tf; |
| 155 | |
| 156 | tf = freq; |
| 157 | while (tf > 0.0) { |
| 158 | tf -= 0.5; |
| 159 | tb = freq2bark(tf); |
| 160 | if (tb <= bark - 0.5) |
| 161 | break; |
| 162 | } |
| 163 | freqmin[i] = tf; |
| 164 | } |
| 165 | |
| 166 | for (i = 0; i < 32; i++) { |
| 167 | freq = freqmax[i]; |
| 168 | for (j = 31; j > 0 && freq <= freqmid[j]; j--); |
| 169 | q->cyclTab[i] = j + 1; |
| 170 | |
| 171 | freq = freqmin[i]; |
| 172 | for (j = 0; j < 32 && freq >= freqmid[j]; j++); |
| 173 | q->cyclTab2[i] = j - 1; |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | static av_cold int imc_decode_init(AVCodecContext *avctx) |
| 178 | { |
| 179 | int i, j, ret; |
| 180 | IMCContext *q = avctx->priv_data; |
| 181 | double r1, r2; |
| 182 | |
| 183 | if (avctx->codec_id == AV_CODEC_ID_IAC && avctx->sample_rate > 96000) { |
| 184 | av_log(avctx, AV_LOG_ERROR, |
| 185 | "Strange sample rate of %i, file likely corrupt or " |
| 186 | "needing a new table derivation method.\n", |
| 187 | avctx->sample_rate); |
| 188 | return AVERROR_PATCHWELCOME; |
| 189 | } |
| 190 | |
| 191 | if (avctx->codec_id == AV_CODEC_ID_IMC) |
| 192 | avctx->channels = 1; |
| 193 | |
| 194 | if (avctx->channels > 2) { |
| 195 | avpriv_request_sample(avctx, "Number of channels > 2"); |
| 196 | return AVERROR_PATCHWELCOME; |
| 197 | } |
| 198 | |
| 199 | for (j = 0; j < avctx->channels; j++) { |
| 200 | q->chctx[j].decoder_reset = 1; |
| 201 | |
| 202 | for (i = 0; i < BANDS; i++) |
| 203 | q->chctx[j].old_floor[i] = 1.0; |
| 204 | |
| 205 | for (i = 0; i < COEFFS / 2; i++) |
| 206 | q->chctx[j].last_fft_im[i] = 0; |
| 207 | } |
| 208 | |
| 209 | /* Build mdct window, a simple sine window normalized with sqrt(2) */ |
| 210 | ff_sine_window_init(q->mdct_sine_window, COEFFS); |
| 211 | for (i = 0; i < COEFFS; i++) |
| 212 | q->mdct_sine_window[i] *= sqrt(2.0); |
| 213 | for (i = 0; i < COEFFS / 2; i++) { |
| 214 | q->post_cos[i] = (1.0f / 32768) * cos(i / 256.0 * M_PI); |
| 215 | q->post_sin[i] = (1.0f / 32768) * sin(i / 256.0 * M_PI); |
| 216 | |
| 217 | r1 = sin((i * 4.0 + 1.0) / 1024.0 * M_PI); |
| 218 | r2 = cos((i * 4.0 + 1.0) / 1024.0 * M_PI); |
| 219 | |
| 220 | if (i & 0x1) { |
| 221 | q->pre_coef1[i] = (r1 + r2) * sqrt(2.0); |
| 222 | q->pre_coef2[i] = -(r1 - r2) * sqrt(2.0); |
| 223 | } else { |
| 224 | q->pre_coef1[i] = -(r1 + r2) * sqrt(2.0); |
| 225 | q->pre_coef2[i] = (r1 - r2) * sqrt(2.0); |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | /* Generate a square root table */ |
| 230 | |
| 231 | for (i = 0; i < 30; i++) |
| 232 | q->sqrt_tab[i] = sqrt(i); |
| 233 | |
| 234 | /* initialize the VLC tables */ |
| 235 | for (i = 0; i < 4 ; i++) { |
| 236 | for (j = 0; j < 4; j++) { |
| 237 | huffman_vlc[i][j].table = &vlc_tables[vlc_offsets[i * 4 + j]]; |
| 238 | huffman_vlc[i][j].table_allocated = vlc_offsets[i * 4 + j + 1] - vlc_offsets[i * 4 + j]; |
| 239 | init_vlc(&huffman_vlc[i][j], 9, imc_huffman_sizes[i], |
| 240 | imc_huffman_lens[i][j], 1, 1, |
| 241 | imc_huffman_bits[i][j], 2, 2, INIT_VLC_USE_NEW_STATIC); |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | if (avctx->codec_id == AV_CODEC_ID_IAC) { |
| 246 | iac_generate_tabs(q, avctx->sample_rate); |
| 247 | } else { |
| 248 | memcpy(q->cyclTab, cyclTab, sizeof(cyclTab)); |
| 249 | memcpy(q->cyclTab2, cyclTab2, sizeof(cyclTab2)); |
| 250 | memcpy(q->weights1, imc_weights1, sizeof(imc_weights1)); |
| 251 | memcpy(q->weights2, imc_weights2, sizeof(imc_weights2)); |
| 252 | } |
| 253 | |
| 254 | if ((ret = ff_fft_init(&q->fft, 7, 1))) { |
| 255 | av_log(avctx, AV_LOG_INFO, "FFT init failed\n"); |
| 256 | return ret; |
| 257 | } |
| 258 | ff_bswapdsp_init(&q->bdsp); |
| 259 | avpriv_float_dsp_init(&q->fdsp, avctx->flags & CODEC_FLAG_BITEXACT); |
| 260 | avctx->sample_fmt = AV_SAMPLE_FMT_FLTP; |
| 261 | avctx->channel_layout = avctx->channels == 1 ? AV_CH_LAYOUT_MONO |
| 262 | : AV_CH_LAYOUT_STEREO; |
| 263 | |
| 264 | return 0; |
| 265 | } |
| 266 | |
| 267 | static void imc_calculate_coeffs(IMCContext *q, float *flcoeffs1, |
| 268 | float *flcoeffs2, int *bandWidthT, |
| 269 | float *flcoeffs3, float *flcoeffs5) |
| 270 | { |
| 271 | float workT1[BANDS]; |
| 272 | float workT2[BANDS]; |
| 273 | float workT3[BANDS]; |
| 274 | float snr_limit = 1.e-30; |
| 275 | float accum = 0.0; |
| 276 | int i, cnt2; |
| 277 | |
| 278 | for (i = 0; i < BANDS; i++) { |
| 279 | flcoeffs5[i] = workT2[i] = 0.0; |
| 280 | if (bandWidthT[i]) { |
| 281 | workT1[i] = flcoeffs1[i] * flcoeffs1[i]; |
| 282 | flcoeffs3[i] = 2.0 * flcoeffs2[i]; |
| 283 | } else { |
| 284 | workT1[i] = 0.0; |
| 285 | flcoeffs3[i] = -30000.0; |
| 286 | } |
| 287 | workT3[i] = bandWidthT[i] * workT1[i] * 0.01; |
| 288 | if (workT3[i] <= snr_limit) |
| 289 | workT3[i] = 0.0; |
| 290 | } |
| 291 | |
| 292 | for (i = 0; i < BANDS; i++) { |
| 293 | for (cnt2 = i; cnt2 < q->cyclTab[i]; cnt2++) |
| 294 | flcoeffs5[cnt2] = flcoeffs5[cnt2] + workT3[i]; |
| 295 | workT2[cnt2 - 1] = workT2[cnt2 - 1] + workT3[i]; |
| 296 | } |
| 297 | |
| 298 | for (i = 1; i < BANDS; i++) { |
| 299 | accum = (workT2[i - 1] + accum) * q->weights1[i - 1]; |
| 300 | flcoeffs5[i] += accum; |
| 301 | } |
| 302 | |
| 303 | for (i = 0; i < BANDS; i++) |
| 304 | workT2[i] = 0.0; |
| 305 | |
| 306 | for (i = 0; i < BANDS; i++) { |
| 307 | for (cnt2 = i - 1; cnt2 > q->cyclTab2[i]; cnt2--) |
| 308 | flcoeffs5[cnt2] += workT3[i]; |
| 309 | workT2[cnt2+1] += workT3[i]; |
| 310 | } |
| 311 | |
| 312 | accum = 0.0; |
| 313 | |
| 314 | for (i = BANDS-2; i >= 0; i--) { |
| 315 | accum = (workT2[i+1] + accum) * q->weights2[i]; |
| 316 | flcoeffs5[i] += accum; |
| 317 | // there is missing code here, but it seems to never be triggered |
| 318 | } |
| 319 | } |
| 320 | |
| 321 | |
| 322 | static void imc_read_level_coeffs(IMCContext *q, int stream_format_code, |
| 323 | int *levlCoeffs) |
| 324 | { |
| 325 | int i; |
| 326 | VLC *hufftab[4]; |
| 327 | int start = 0; |
| 328 | const uint8_t *cb_sel; |
| 329 | int s; |
| 330 | |
| 331 | s = stream_format_code >> 1; |
| 332 | hufftab[0] = &huffman_vlc[s][0]; |
| 333 | hufftab[1] = &huffman_vlc[s][1]; |
| 334 | hufftab[2] = &huffman_vlc[s][2]; |
| 335 | hufftab[3] = &huffman_vlc[s][3]; |
| 336 | cb_sel = imc_cb_select[s]; |
| 337 | |
| 338 | if (stream_format_code & 4) |
| 339 | start = 1; |
| 340 | if (start) |
| 341 | levlCoeffs[0] = get_bits(&q->gb, 7); |
| 342 | for (i = start; i < BANDS; i++) { |
| 343 | levlCoeffs[i] = get_vlc2(&q->gb, hufftab[cb_sel[i]]->table, |
| 344 | hufftab[cb_sel[i]]->bits, 2); |
| 345 | if (levlCoeffs[i] == 17) |
| 346 | levlCoeffs[i] += get_bits(&q->gb, 4); |
| 347 | } |
| 348 | } |
| 349 | |
| 350 | static void imc_read_level_coeffs_raw(IMCContext *q, int stream_format_code, |
| 351 | int *levlCoeffs) |
| 352 | { |
| 353 | int i; |
| 354 | |
| 355 | q->coef0_pos = get_bits(&q->gb, 5); |
| 356 | levlCoeffs[0] = get_bits(&q->gb, 7); |
| 357 | for (i = 1; i < BANDS; i++) |
| 358 | levlCoeffs[i] = get_bits(&q->gb, 4); |
| 359 | } |
| 360 | |
| 361 | static void imc_decode_level_coefficients(IMCContext *q, int *levlCoeffBuf, |
| 362 | float *flcoeffs1, float *flcoeffs2) |
| 363 | { |
| 364 | int i, level; |
| 365 | float tmp, tmp2; |
| 366 | // maybe some frequency division thingy |
| 367 | |
| 368 | flcoeffs1[0] = 20000.0 / exp2 (levlCoeffBuf[0] * 0.18945); // 0.18945 = log2(10) * 0.05703125 |
| 369 | flcoeffs2[0] = log2f(flcoeffs1[0]); |
| 370 | tmp = flcoeffs1[0]; |
| 371 | tmp2 = flcoeffs2[0]; |
| 372 | |
| 373 | for (i = 1; i < BANDS; i++) { |
| 374 | level = levlCoeffBuf[i]; |
| 375 | if (level == 16) { |
| 376 | flcoeffs1[i] = 1.0; |
| 377 | flcoeffs2[i] = 0.0; |
| 378 | } else { |
| 379 | if (level < 17) |
| 380 | level -= 7; |
| 381 | else if (level <= 24) |
| 382 | level -= 32; |
| 383 | else |
| 384 | level -= 16; |
| 385 | |
| 386 | tmp *= imc_exp_tab[15 + level]; |
| 387 | tmp2 += 0.83048 * level; // 0.83048 = log2(10) * 0.25 |
| 388 | flcoeffs1[i] = tmp; |
| 389 | flcoeffs2[i] = tmp2; |
| 390 | } |
| 391 | } |
| 392 | } |
| 393 | |
| 394 | |
| 395 | static void imc_decode_level_coefficients2(IMCContext *q, int *levlCoeffBuf, |
| 396 | float *old_floor, float *flcoeffs1, |
| 397 | float *flcoeffs2) |
| 398 | { |
| 399 | int i; |
| 400 | /* FIXME maybe flag_buf = noise coding and flcoeffs1 = new scale factors |
| 401 | * and flcoeffs2 old scale factors |
| 402 | * might be incomplete due to a missing table that is in the binary code |
| 403 | */ |
| 404 | for (i = 0; i < BANDS; i++) { |
| 405 | flcoeffs1[i] = 0; |
| 406 | if (levlCoeffBuf[i] < 16) { |
| 407 | flcoeffs1[i] = imc_exp_tab2[levlCoeffBuf[i]] * old_floor[i]; |
| 408 | flcoeffs2[i] = (levlCoeffBuf[i] - 7) * 0.83048 + flcoeffs2[i]; // 0.83048 = log2(10) * 0.25 |
| 409 | } else { |
| 410 | flcoeffs1[i] = old_floor[i]; |
| 411 | } |
| 412 | } |
| 413 | } |
| 414 | |
| 415 | static void imc_decode_level_coefficients_raw(IMCContext *q, int *levlCoeffBuf, |
| 416 | float *flcoeffs1, float *flcoeffs2) |
| 417 | { |
| 418 | int i, level, pos; |
| 419 | float tmp, tmp2; |
| 420 | |
| 421 | pos = q->coef0_pos; |
| 422 | flcoeffs1[pos] = 20000.0 / pow (2, levlCoeffBuf[0] * 0.18945); // 0.18945 = log2(10) * 0.05703125 |
| 423 | flcoeffs2[pos] = log2f(flcoeffs1[0]); |
| 424 | tmp = flcoeffs1[pos]; |
| 425 | tmp2 = flcoeffs2[pos]; |
| 426 | |
| 427 | levlCoeffBuf++; |
| 428 | for (i = 0; i < BANDS; i++) { |
| 429 | if (i == pos) |
| 430 | continue; |
| 431 | level = *levlCoeffBuf++; |
| 432 | flcoeffs1[i] = tmp * powf(10.0, -level * 0.4375); //todo tab |
| 433 | flcoeffs2[i] = tmp2 - 1.4533435415 * level; // 1.4533435415 = log2(10) * 0.4375 |
| 434 | } |
| 435 | } |
| 436 | |
| 437 | /** |
| 438 | * Perform bit allocation depending on bits available |
| 439 | */ |
| 440 | static int bit_allocation(IMCContext *q, IMCChannel *chctx, |
| 441 | int stream_format_code, int freebits, int flag) |
| 442 | { |
| 443 | int i, j; |
| 444 | const float limit = -1.e20; |
| 445 | float highest = 0.0; |
| 446 | int indx; |
| 447 | int t1 = 0; |
| 448 | int t2 = 1; |
| 449 | float summa = 0.0; |
| 450 | int iacc = 0; |
| 451 | int summer = 0; |
| 452 | int rres, cwlen; |
| 453 | float lowest = 1.e10; |
| 454 | int low_indx = 0; |
| 455 | float workT[32]; |
| 456 | int flg; |
| 457 | int found_indx = 0; |
| 458 | |
| 459 | for (i = 0; i < BANDS; i++) |
| 460 | highest = FFMAX(highest, chctx->flcoeffs1[i]); |
| 461 | |
| 462 | for (i = 0; i < BANDS - 1; i++) { |
| 463 | if (chctx->flcoeffs5[i] <= 0) { |
| 464 | av_log(NULL, AV_LOG_ERROR, "flcoeffs5 %f invalid\n", chctx->flcoeffs5[i]); |
| 465 | return AVERROR_INVALIDDATA; |
| 466 | } |
| 467 | chctx->flcoeffs4[i] = chctx->flcoeffs3[i] - log2f(chctx->flcoeffs5[i]); |
| 468 | } |
| 469 | chctx->flcoeffs4[BANDS - 1] = limit; |
| 470 | |
| 471 | highest = highest * 0.25; |
| 472 | |
| 473 | for (i = 0; i < BANDS; i++) { |
| 474 | indx = -1; |
| 475 | if ((band_tab[i + 1] - band_tab[i]) == chctx->bandWidthT[i]) |
| 476 | indx = 0; |
| 477 | |
| 478 | if ((band_tab[i + 1] - band_tab[i]) > chctx->bandWidthT[i]) |
| 479 | indx = 1; |
| 480 | |
| 481 | if (((band_tab[i + 1] - band_tab[i]) / 2) >= chctx->bandWidthT[i]) |
| 482 | indx = 2; |
| 483 | |
| 484 | if (indx == -1) |
| 485 | return AVERROR_INVALIDDATA; |
| 486 | |
| 487 | chctx->flcoeffs4[i] += xTab[(indx * 2 + (chctx->flcoeffs1[i] < highest)) * 2 + flag]; |
| 488 | } |
| 489 | |
| 490 | if (stream_format_code & 0x2) { |
| 491 | chctx->flcoeffs4[0] = limit; |
| 492 | chctx->flcoeffs4[1] = limit; |
| 493 | chctx->flcoeffs4[2] = limit; |
| 494 | chctx->flcoeffs4[3] = limit; |
| 495 | } |
| 496 | |
| 497 | for (i = (stream_format_code & 0x2) ? 4 : 0; i < BANDS - 1; i++) { |
| 498 | iacc += chctx->bandWidthT[i]; |
| 499 | summa += chctx->bandWidthT[i] * chctx->flcoeffs4[i]; |
| 500 | } |
| 501 | |
| 502 | if (!iacc) |
| 503 | return AVERROR_INVALIDDATA; |
| 504 | |
| 505 | chctx->bandWidthT[BANDS - 1] = 0; |
| 506 | summa = (summa * 0.5 - freebits) / iacc; |
| 507 | |
| 508 | |
| 509 | for (i = 0; i < BANDS / 2; i++) { |
| 510 | rres = summer - freebits; |
| 511 | if ((rres >= -8) && (rres <= 8)) |
| 512 | break; |
| 513 | |
| 514 | summer = 0; |
| 515 | iacc = 0; |
| 516 | |
| 517 | for (j = (stream_format_code & 0x2) ? 4 : 0; j < BANDS; j++) { |
| 518 | cwlen = av_clipf(((chctx->flcoeffs4[j] * 0.5) - summa + 0.5), 0, 6); |
| 519 | |
| 520 | chctx->bitsBandT[j] = cwlen; |
| 521 | summer += chctx->bandWidthT[j] * cwlen; |
| 522 | |
| 523 | if (cwlen > 0) |
| 524 | iacc += chctx->bandWidthT[j]; |
| 525 | } |
| 526 | |
| 527 | flg = t2; |
| 528 | t2 = 1; |
| 529 | if (freebits < summer) |
| 530 | t2 = -1; |
| 531 | if (i == 0) |
| 532 | flg = t2; |
| 533 | if (flg != t2) |
| 534 | t1++; |
| 535 | |
| 536 | summa = (float)(summer - freebits) / ((t1 + 1) * iacc) + summa; |
| 537 | } |
| 538 | |
| 539 | for (i = (stream_format_code & 0x2) ? 4 : 0; i < BANDS; i++) { |
| 540 | for (j = band_tab[i]; j < band_tab[i + 1]; j++) |
| 541 | chctx->CWlengthT[j] = chctx->bitsBandT[i]; |
| 542 | } |
| 543 | |
| 544 | if (freebits > summer) { |
| 545 | for (i = 0; i < BANDS; i++) { |
| 546 | workT[i] = (chctx->bitsBandT[i] == 6) ? -1.e20 |
| 547 | : (chctx->bitsBandT[i] * -2 + chctx->flcoeffs4[i] - 0.415); |
| 548 | } |
| 549 | |
| 550 | highest = 0.0; |
| 551 | |
| 552 | do { |
| 553 | if (highest <= -1.e20) |
| 554 | break; |
| 555 | |
| 556 | found_indx = 0; |
| 557 | highest = -1.e20; |
| 558 | |
| 559 | for (i = 0; i < BANDS; i++) { |
| 560 | if (workT[i] > highest) { |
| 561 | highest = workT[i]; |
| 562 | found_indx = i; |
| 563 | } |
| 564 | } |
| 565 | |
| 566 | if (highest > -1.e20) { |
| 567 | workT[found_indx] -= 2.0; |
| 568 | if (++chctx->bitsBandT[found_indx] == 6) |
| 569 | workT[found_indx] = -1.e20; |
| 570 | |
| 571 | for (j = band_tab[found_indx]; j < band_tab[found_indx + 1] && (freebits > summer); j++) { |
| 572 | chctx->CWlengthT[j]++; |
| 573 | summer++; |
| 574 | } |
| 575 | } |
| 576 | } while (freebits > summer); |
| 577 | } |
| 578 | if (freebits < summer) { |
| 579 | for (i = 0; i < BANDS; i++) { |
| 580 | workT[i] = chctx->bitsBandT[i] ? (chctx->bitsBandT[i] * -2 + chctx->flcoeffs4[i] + 1.585) |
| 581 | : 1.e20; |
| 582 | } |
| 583 | if (stream_format_code & 0x2) { |
| 584 | workT[0] = 1.e20; |
| 585 | workT[1] = 1.e20; |
| 586 | workT[2] = 1.e20; |
| 587 | workT[3] = 1.e20; |
| 588 | } |
| 589 | while (freebits < summer) { |
| 590 | lowest = 1.e10; |
| 591 | low_indx = 0; |
| 592 | for (i = 0; i < BANDS; i++) { |
| 593 | if (workT[i] < lowest) { |
| 594 | lowest = workT[i]; |
| 595 | low_indx = i; |
| 596 | } |
| 597 | } |
| 598 | // if (lowest >= 1.e10) |
| 599 | // break; |
| 600 | workT[low_indx] = lowest + 2.0; |
| 601 | |
| 602 | if (!--chctx->bitsBandT[low_indx]) |
| 603 | workT[low_indx] = 1.e20; |
| 604 | |
| 605 | for (j = band_tab[low_indx]; j < band_tab[low_indx+1] && (freebits < summer); j++) { |
| 606 | if (chctx->CWlengthT[j] > 0) { |
| 607 | chctx->CWlengthT[j]--; |
| 608 | summer--; |
| 609 | } |
| 610 | } |
| 611 | } |
| 612 | } |
| 613 | return 0; |
| 614 | } |
| 615 | |
| 616 | static void imc_get_skip_coeff(IMCContext *q, IMCChannel *chctx) |
| 617 | { |
| 618 | int i, j; |
| 619 | |
| 620 | memset(chctx->skipFlagBits, 0, sizeof(chctx->skipFlagBits)); |
| 621 | memset(chctx->skipFlagCount, 0, sizeof(chctx->skipFlagCount)); |
| 622 | for (i = 0; i < BANDS; i++) { |
| 623 | if (!chctx->bandFlagsBuf[i] || !chctx->bandWidthT[i]) |
| 624 | continue; |
| 625 | |
| 626 | if (!chctx->skipFlagRaw[i]) { |
| 627 | chctx->skipFlagBits[i] = band_tab[i + 1] - band_tab[i]; |
| 628 | |
| 629 | for (j = band_tab[i]; j < band_tab[i + 1]; j++) { |
| 630 | chctx->skipFlags[j] = get_bits1(&q->gb); |
| 631 | if (chctx->skipFlags[j]) |
| 632 | chctx->skipFlagCount[i]++; |
| 633 | } |
| 634 | } else { |
| 635 | for (j = band_tab[i]; j < band_tab[i + 1] - 1; j += 2) { |
| 636 | if (!get_bits1(&q->gb)) { // 0 |
| 637 | chctx->skipFlagBits[i]++; |
| 638 | chctx->skipFlags[j] = 1; |
| 639 | chctx->skipFlags[j + 1] = 1; |
| 640 | chctx->skipFlagCount[i] += 2; |
| 641 | } else { |
| 642 | if (get_bits1(&q->gb)) { // 11 |
| 643 | chctx->skipFlagBits[i] += 2; |
| 644 | chctx->skipFlags[j] = 0; |
| 645 | chctx->skipFlags[j + 1] = 1; |
| 646 | chctx->skipFlagCount[i]++; |
| 647 | } else { |
| 648 | chctx->skipFlagBits[i] += 3; |
| 649 | chctx->skipFlags[j + 1] = 0; |
| 650 | if (!get_bits1(&q->gb)) { // 100 |
| 651 | chctx->skipFlags[j] = 1; |
| 652 | chctx->skipFlagCount[i]++; |
| 653 | } else { // 101 |
| 654 | chctx->skipFlags[j] = 0; |
| 655 | } |
| 656 | } |
| 657 | } |
| 658 | } |
| 659 | |
| 660 | if (j < band_tab[i + 1]) { |
| 661 | chctx->skipFlagBits[i]++; |
| 662 | if ((chctx->skipFlags[j] = get_bits1(&q->gb))) |
| 663 | chctx->skipFlagCount[i]++; |
| 664 | } |
| 665 | } |
| 666 | } |
| 667 | } |
| 668 | |
| 669 | /** |
| 670 | * Increase highest' band coefficient sizes as some bits won't be used |
| 671 | */ |
| 672 | static void imc_adjust_bit_allocation(IMCContext *q, IMCChannel *chctx, |
| 673 | int summer) |
| 674 | { |
| 675 | float workT[32]; |
| 676 | int corrected = 0; |
| 677 | int i, j; |
| 678 | float highest = 0; |
| 679 | int found_indx = 0; |
| 680 | |
| 681 | for (i = 0; i < BANDS; i++) { |
| 682 | workT[i] = (chctx->bitsBandT[i] == 6) ? -1.e20 |
| 683 | : (chctx->bitsBandT[i] * -2 + chctx->flcoeffs4[i] - 0.415); |
| 684 | } |
| 685 | |
| 686 | while (corrected < summer) { |
| 687 | if (highest <= -1.e20) |
| 688 | break; |
| 689 | |
| 690 | highest = -1.e20; |
| 691 | |
| 692 | for (i = 0; i < BANDS; i++) { |
| 693 | if (workT[i] > highest) { |
| 694 | highest = workT[i]; |
| 695 | found_indx = i; |
| 696 | } |
| 697 | } |
| 698 | |
| 699 | if (highest > -1.e20) { |
| 700 | workT[found_indx] -= 2.0; |
| 701 | if (++(chctx->bitsBandT[found_indx]) == 6) |
| 702 | workT[found_indx] = -1.e20; |
| 703 | |
| 704 | for (j = band_tab[found_indx]; j < band_tab[found_indx+1] && (corrected < summer); j++) { |
| 705 | if (!chctx->skipFlags[j] && (chctx->CWlengthT[j] < 6)) { |
| 706 | chctx->CWlengthT[j]++; |
| 707 | corrected++; |
| 708 | } |
| 709 | } |
| 710 | } |
| 711 | } |
| 712 | } |
| 713 | |
| 714 | static void imc_imdct256(IMCContext *q, IMCChannel *chctx, int channels) |
| 715 | { |
| 716 | int i; |
| 717 | float re, im; |
| 718 | float *dst1 = q->out_samples; |
| 719 | float *dst2 = q->out_samples + (COEFFS - 1); |
| 720 | |
| 721 | /* prerotation */ |
| 722 | for (i = 0; i < COEFFS / 2; i++) { |
| 723 | q->samples[i].re = -(q->pre_coef1[i] * chctx->CWdecoded[COEFFS - 1 - i * 2]) - |
| 724 | (q->pre_coef2[i] * chctx->CWdecoded[i * 2]); |
| 725 | q->samples[i].im = (q->pre_coef2[i] * chctx->CWdecoded[COEFFS - 1 - i * 2]) - |
| 726 | (q->pre_coef1[i] * chctx->CWdecoded[i * 2]); |
| 727 | } |
| 728 | |
| 729 | /* FFT */ |
| 730 | q->fft.fft_permute(&q->fft, q->samples); |
| 731 | q->fft.fft_calc(&q->fft, q->samples); |
| 732 | |
| 733 | /* postrotation, window and reorder */ |
| 734 | for (i = 0; i < COEFFS / 2; i++) { |
| 735 | re = ( q->samples[i].re * q->post_cos[i]) + (-q->samples[i].im * q->post_sin[i]); |
| 736 | im = (-q->samples[i].im * q->post_cos[i]) - ( q->samples[i].re * q->post_sin[i]); |
| 737 | *dst1 = (q->mdct_sine_window[COEFFS - 1 - i * 2] * chctx->last_fft_im[i]) |
| 738 | + (q->mdct_sine_window[i * 2] * re); |
| 739 | *dst2 = (q->mdct_sine_window[i * 2] * chctx->last_fft_im[i]) |
| 740 | - (q->mdct_sine_window[COEFFS - 1 - i * 2] * re); |
| 741 | dst1 += 2; |
| 742 | dst2 -= 2; |
| 743 | chctx->last_fft_im[i] = im; |
| 744 | } |
| 745 | } |
| 746 | |
| 747 | static int inverse_quant_coeff(IMCContext *q, IMCChannel *chctx, |
| 748 | int stream_format_code) |
| 749 | { |
| 750 | int i, j; |
| 751 | int middle_value, cw_len, max_size; |
| 752 | const float *quantizer; |
| 753 | |
| 754 | for (i = 0; i < BANDS; i++) { |
| 755 | for (j = band_tab[i]; j < band_tab[i + 1]; j++) { |
| 756 | chctx->CWdecoded[j] = 0; |
| 757 | cw_len = chctx->CWlengthT[j]; |
| 758 | |
| 759 | if (cw_len <= 0 || chctx->skipFlags[j]) |
| 760 | continue; |
| 761 | |
| 762 | max_size = 1 << cw_len; |
| 763 | middle_value = max_size >> 1; |
| 764 | |
| 765 | if (chctx->codewords[j] >= max_size || chctx->codewords[j] < 0) |
| 766 | return AVERROR_INVALIDDATA; |
| 767 | |
| 768 | if (cw_len >= 4) { |
| 769 | quantizer = imc_quantizer2[(stream_format_code & 2) >> 1]; |
| 770 | if (chctx->codewords[j] >= middle_value) |
| 771 | chctx->CWdecoded[j] = quantizer[chctx->codewords[j] - 8] * chctx->flcoeffs6[i]; |
| 772 | else |
| 773 | chctx->CWdecoded[j] = -quantizer[max_size - chctx->codewords[j] - 8 - 1] * chctx->flcoeffs6[i]; |
| 774 | }else{ |
| 775 | quantizer = imc_quantizer1[((stream_format_code & 2) >> 1) | (chctx->bandFlagsBuf[i] << 1)]; |
| 776 | if (chctx->codewords[j] >= middle_value) |
| 777 | chctx->CWdecoded[j] = quantizer[chctx->codewords[j] - 1] * chctx->flcoeffs6[i]; |
| 778 | else |
| 779 | chctx->CWdecoded[j] = -quantizer[max_size - 2 - chctx->codewords[j]] * chctx->flcoeffs6[i]; |
| 780 | } |
| 781 | } |
| 782 | } |
| 783 | return 0; |
| 784 | } |
| 785 | |
| 786 | |
| 787 | static int imc_get_coeffs(IMCContext *q, IMCChannel *chctx) |
| 788 | { |
| 789 | int i, j, cw_len, cw; |
| 790 | |
| 791 | for (i = 0; i < BANDS; i++) { |
| 792 | if (!chctx->sumLenArr[i]) |
| 793 | continue; |
| 794 | if (chctx->bandFlagsBuf[i] || chctx->bandWidthT[i]) { |
| 795 | for (j = band_tab[i]; j < band_tab[i + 1]; j++) { |
| 796 | cw_len = chctx->CWlengthT[j]; |
| 797 | cw = 0; |
| 798 | |
| 799 | if (get_bits_count(&q->gb) + cw_len > 512) { |
| 800 | av_dlog(NULL, "Band %i coeff %i cw_len %i\n", i, j, cw_len); |
| 801 | return AVERROR_INVALIDDATA; |
| 802 | } |
| 803 | |
| 804 | if (cw_len && (!chctx->bandFlagsBuf[i] || !chctx->skipFlags[j])) |
| 805 | cw = get_bits(&q->gb, cw_len); |
| 806 | |
| 807 | chctx->codewords[j] = cw; |
| 808 | } |
| 809 | } |
| 810 | } |
| 811 | return 0; |
| 812 | } |
| 813 | |
| 814 | static void imc_refine_bit_allocation(IMCContext *q, IMCChannel *chctx) |
| 815 | { |
| 816 | int i, j; |
| 817 | int bits, summer; |
| 818 | |
| 819 | for (i = 0; i < BANDS; i++) { |
| 820 | chctx->sumLenArr[i] = 0; |
| 821 | chctx->skipFlagRaw[i] = 0; |
| 822 | for (j = band_tab[i]; j < band_tab[i + 1]; j++) |
| 823 | chctx->sumLenArr[i] += chctx->CWlengthT[j]; |
| 824 | if (chctx->bandFlagsBuf[i]) |
| 825 | if ((((band_tab[i + 1] - band_tab[i]) * 1.5) > chctx->sumLenArr[i]) && (chctx->sumLenArr[i] > 0)) |
| 826 | chctx->skipFlagRaw[i] = 1; |
| 827 | } |
| 828 | |
| 829 | imc_get_skip_coeff(q, chctx); |
| 830 | |
| 831 | for (i = 0; i < BANDS; i++) { |
| 832 | chctx->flcoeffs6[i] = chctx->flcoeffs1[i]; |
| 833 | /* band has flag set and at least one coded coefficient */ |
| 834 | if (chctx->bandFlagsBuf[i] && (band_tab[i + 1] - band_tab[i]) != chctx->skipFlagCount[i]) { |
| 835 | chctx->flcoeffs6[i] *= q->sqrt_tab[ band_tab[i + 1] - band_tab[i]] / |
| 836 | q->sqrt_tab[(band_tab[i + 1] - band_tab[i] - chctx->skipFlagCount[i])]; |
| 837 | } |
| 838 | } |
| 839 | |
| 840 | /* calculate bits left, bits needed and adjust bit allocation */ |
| 841 | bits = summer = 0; |
| 842 | |
| 843 | for (i = 0; i < BANDS; i++) { |
| 844 | if (chctx->bandFlagsBuf[i]) { |
| 845 | for (j = band_tab[i]; j < band_tab[i + 1]; j++) { |
| 846 | if (chctx->skipFlags[j]) { |
| 847 | summer += chctx->CWlengthT[j]; |
| 848 | chctx->CWlengthT[j] = 0; |
| 849 | } |
| 850 | } |
| 851 | bits += chctx->skipFlagBits[i]; |
| 852 | summer -= chctx->skipFlagBits[i]; |
| 853 | } |
| 854 | } |
| 855 | imc_adjust_bit_allocation(q, chctx, summer); |
| 856 | } |
| 857 | |
| 858 | static int imc_decode_block(AVCodecContext *avctx, IMCContext *q, int ch) |
| 859 | { |
| 860 | int stream_format_code; |
| 861 | int imc_hdr, i, j, ret; |
| 862 | int flag; |
| 863 | int bits; |
| 864 | int counter, bitscount; |
| 865 | IMCChannel *chctx = q->chctx + ch; |
| 866 | |
| 867 | |
| 868 | /* Check the frame header */ |
| 869 | imc_hdr = get_bits(&q->gb, 9); |
| 870 | if (imc_hdr & 0x18) { |
| 871 | av_log(avctx, AV_LOG_ERROR, "frame header check failed!\n"); |
| 872 | av_log(avctx, AV_LOG_ERROR, "got %X.\n", imc_hdr); |
| 873 | return AVERROR_INVALIDDATA; |
| 874 | } |
| 875 | stream_format_code = get_bits(&q->gb, 3); |
| 876 | |
| 877 | if (stream_format_code & 0x04) |
| 878 | chctx->decoder_reset = 1; |
| 879 | |
| 880 | if (chctx->decoder_reset) { |
| 881 | for (i = 0; i < BANDS; i++) |
| 882 | chctx->old_floor[i] = 1.0; |
| 883 | for (i = 0; i < COEFFS; i++) |
| 884 | chctx->CWdecoded[i] = 0; |
| 885 | chctx->decoder_reset = 0; |
| 886 | } |
| 887 | |
| 888 | flag = get_bits1(&q->gb); |
| 889 | if (stream_format_code & 0x1) |
| 890 | imc_read_level_coeffs_raw(q, stream_format_code, chctx->levlCoeffBuf); |
| 891 | else |
| 892 | imc_read_level_coeffs(q, stream_format_code, chctx->levlCoeffBuf); |
| 893 | |
| 894 | if (stream_format_code & 0x1) |
| 895 | imc_decode_level_coefficients_raw(q, chctx->levlCoeffBuf, |
| 896 | chctx->flcoeffs1, chctx->flcoeffs2); |
| 897 | else if (stream_format_code & 0x4) |
| 898 | imc_decode_level_coefficients(q, chctx->levlCoeffBuf, |
| 899 | chctx->flcoeffs1, chctx->flcoeffs2); |
| 900 | else |
| 901 | imc_decode_level_coefficients2(q, chctx->levlCoeffBuf, chctx->old_floor, |
| 902 | chctx->flcoeffs1, chctx->flcoeffs2); |
| 903 | |
| 904 | for(i=0; i<BANDS; i++) { |
| 905 | if(chctx->flcoeffs1[i] > INT_MAX) { |
| 906 | av_log(avctx, AV_LOG_ERROR, "scalefactor out of range\n"); |
| 907 | return AVERROR_INVALIDDATA; |
| 908 | } |
| 909 | } |
| 910 | |
| 911 | memcpy(chctx->old_floor, chctx->flcoeffs1, 32 * sizeof(float)); |
| 912 | |
| 913 | counter = 0; |
| 914 | if (stream_format_code & 0x1) { |
| 915 | for (i = 0; i < BANDS; i++) { |
| 916 | chctx->bandWidthT[i] = band_tab[i + 1] - band_tab[i]; |
| 917 | chctx->bandFlagsBuf[i] = 0; |
| 918 | chctx->flcoeffs3[i] = chctx->flcoeffs2[i] * 2; |
| 919 | chctx->flcoeffs5[i] = 1.0; |
| 920 | } |
| 921 | } else { |
| 922 | for (i = 0; i < BANDS; i++) { |
| 923 | if (chctx->levlCoeffBuf[i] == 16) { |
| 924 | chctx->bandWidthT[i] = 0; |
| 925 | counter++; |
| 926 | } else |
| 927 | chctx->bandWidthT[i] = band_tab[i + 1] - band_tab[i]; |
| 928 | } |
| 929 | |
| 930 | memset(chctx->bandFlagsBuf, 0, BANDS * sizeof(int)); |
| 931 | for (i = 0; i < BANDS - 1; i++) |
| 932 | if (chctx->bandWidthT[i]) |
| 933 | chctx->bandFlagsBuf[i] = get_bits1(&q->gb); |
| 934 | |
| 935 | imc_calculate_coeffs(q, chctx->flcoeffs1, chctx->flcoeffs2, |
| 936 | chctx->bandWidthT, chctx->flcoeffs3, |
| 937 | chctx->flcoeffs5); |
| 938 | } |
| 939 | |
| 940 | bitscount = 0; |
| 941 | /* first 4 bands will be assigned 5 bits per coefficient */ |
| 942 | if (stream_format_code & 0x2) { |
| 943 | bitscount += 15; |
| 944 | |
| 945 | chctx->bitsBandT[0] = 5; |
| 946 | chctx->CWlengthT[0] = 5; |
| 947 | chctx->CWlengthT[1] = 5; |
| 948 | chctx->CWlengthT[2] = 5; |
| 949 | for (i = 1; i < 4; i++) { |
| 950 | if (stream_format_code & 0x1) |
| 951 | bits = 5; |
| 952 | else |
| 953 | bits = (chctx->levlCoeffBuf[i] == 16) ? 0 : 5; |
| 954 | chctx->bitsBandT[i] = bits; |
| 955 | for (j = band_tab[i]; j < band_tab[i + 1]; j++) { |
| 956 | chctx->CWlengthT[j] = bits; |
| 957 | bitscount += bits; |
| 958 | } |
| 959 | } |
| 960 | } |
| 961 | if (avctx->codec_id == AV_CODEC_ID_IAC) { |
| 962 | bitscount += !!chctx->bandWidthT[BANDS - 1]; |
| 963 | if (!(stream_format_code & 0x2)) |
| 964 | bitscount += 16; |
| 965 | } |
| 966 | |
| 967 | if ((ret = bit_allocation(q, chctx, stream_format_code, |
| 968 | 512 - bitscount - get_bits_count(&q->gb), |
| 969 | flag)) < 0) { |
| 970 | av_log(avctx, AV_LOG_ERROR, "Bit allocations failed\n"); |
| 971 | chctx->decoder_reset = 1; |
| 972 | return ret; |
| 973 | } |
| 974 | |
| 975 | if (stream_format_code & 0x1) { |
| 976 | for (i = 0; i < BANDS; i++) |
| 977 | chctx->skipFlags[i] = 0; |
| 978 | } else { |
| 979 | imc_refine_bit_allocation(q, chctx); |
| 980 | } |
| 981 | |
| 982 | for (i = 0; i < BANDS; i++) { |
| 983 | chctx->sumLenArr[i] = 0; |
| 984 | |
| 985 | for (j = band_tab[i]; j < band_tab[i + 1]; j++) |
| 986 | if (!chctx->skipFlags[j]) |
| 987 | chctx->sumLenArr[i] += chctx->CWlengthT[j]; |
| 988 | } |
| 989 | |
| 990 | memset(chctx->codewords, 0, sizeof(chctx->codewords)); |
| 991 | |
| 992 | if (imc_get_coeffs(q, chctx) < 0) { |
| 993 | av_log(avctx, AV_LOG_ERROR, "Read coefficients failed\n"); |
| 994 | chctx->decoder_reset = 1; |
| 995 | return AVERROR_INVALIDDATA; |
| 996 | } |
| 997 | |
| 998 | if (inverse_quant_coeff(q, chctx, stream_format_code) < 0) { |
| 999 | av_log(avctx, AV_LOG_ERROR, "Inverse quantization of coefficients failed\n"); |
| 1000 | chctx->decoder_reset = 1; |
| 1001 | return AVERROR_INVALIDDATA; |
| 1002 | } |
| 1003 | |
| 1004 | memset(chctx->skipFlags, 0, sizeof(chctx->skipFlags)); |
| 1005 | |
| 1006 | imc_imdct256(q, chctx, avctx->channels); |
| 1007 | |
| 1008 | return 0; |
| 1009 | } |
| 1010 | |
| 1011 | static int imc_decode_frame(AVCodecContext *avctx, void *data, |
| 1012 | int *got_frame_ptr, AVPacket *avpkt) |
| 1013 | { |
| 1014 | AVFrame *frame = data; |
| 1015 | const uint8_t *buf = avpkt->data; |
| 1016 | int buf_size = avpkt->size; |
| 1017 | int ret, i; |
| 1018 | |
| 1019 | IMCContext *q = avctx->priv_data; |
| 1020 | |
| 1021 | LOCAL_ALIGNED_16(uint16_t, buf16, [IMC_BLOCK_SIZE / 2 + FF_INPUT_BUFFER_PADDING_SIZE/2]); |
| 1022 | |
| 1023 | if (buf_size < IMC_BLOCK_SIZE * avctx->channels) { |
| 1024 | av_log(avctx, AV_LOG_ERROR, "frame too small!\n"); |
| 1025 | return AVERROR_INVALIDDATA; |
| 1026 | } |
| 1027 | |
| 1028 | /* get output buffer */ |
| 1029 | frame->nb_samples = COEFFS; |
| 1030 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| 1031 | return ret; |
| 1032 | |
| 1033 | for (i = 0; i < avctx->channels; i++) { |
| 1034 | q->out_samples = (float *)frame->extended_data[i]; |
| 1035 | |
| 1036 | q->bdsp.bswap16_buf(buf16, (const uint16_t *) buf, IMC_BLOCK_SIZE / 2); |
| 1037 | |
| 1038 | init_get_bits(&q->gb, (const uint8_t*)buf16, IMC_BLOCK_SIZE * 8); |
| 1039 | |
| 1040 | buf += IMC_BLOCK_SIZE; |
| 1041 | |
| 1042 | if ((ret = imc_decode_block(avctx, q, i)) < 0) |
| 1043 | return ret; |
| 1044 | } |
| 1045 | |
| 1046 | if (avctx->channels == 2) { |
| 1047 | q->fdsp.butterflies_float((float *)frame->extended_data[0], |
| 1048 | (float *)frame->extended_data[1], COEFFS); |
| 1049 | } |
| 1050 | |
| 1051 | *got_frame_ptr = 1; |
| 1052 | |
| 1053 | return IMC_BLOCK_SIZE * avctx->channels; |
| 1054 | } |
| 1055 | |
| 1056 | |
| 1057 | static av_cold int imc_decode_close(AVCodecContext * avctx) |
| 1058 | { |
| 1059 | IMCContext *q = avctx->priv_data; |
| 1060 | |
| 1061 | ff_fft_end(&q->fft); |
| 1062 | |
| 1063 | return 0; |
| 1064 | } |
| 1065 | |
| 1066 | static av_cold void flush(AVCodecContext *avctx) |
| 1067 | { |
| 1068 | IMCContext *q = avctx->priv_data; |
| 1069 | |
| 1070 | q->chctx[0].decoder_reset = |
| 1071 | q->chctx[1].decoder_reset = 1; |
| 1072 | } |
| 1073 | |
| 1074 | #if CONFIG_IMC_DECODER |
| 1075 | AVCodec ff_imc_decoder = { |
| 1076 | .name = "imc", |
| 1077 | .long_name = NULL_IF_CONFIG_SMALL("IMC (Intel Music Coder)"), |
| 1078 | .type = AVMEDIA_TYPE_AUDIO, |
| 1079 | .id = AV_CODEC_ID_IMC, |
| 1080 | .priv_data_size = sizeof(IMCContext), |
| 1081 | .init = imc_decode_init, |
| 1082 | .close = imc_decode_close, |
| 1083 | .decode = imc_decode_frame, |
| 1084 | .flush = flush, |
| 1085 | .capabilities = CODEC_CAP_DR1, |
| 1086 | .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, |
| 1087 | AV_SAMPLE_FMT_NONE }, |
| 1088 | }; |
| 1089 | #endif |
| 1090 | #if CONFIG_IAC_DECODER |
| 1091 | AVCodec ff_iac_decoder = { |
| 1092 | .name = "iac", |
| 1093 | .long_name = NULL_IF_CONFIG_SMALL("IAC (Indeo Audio Coder)"), |
| 1094 | .type = AVMEDIA_TYPE_AUDIO, |
| 1095 | .id = AV_CODEC_ID_IAC, |
| 1096 | .priv_data_size = sizeof(IMCContext), |
| 1097 | .init = imc_decode_init, |
| 1098 | .close = imc_decode_close, |
| 1099 | .decode = imc_decode_frame, |
| 1100 | .flush = flush, |
| 1101 | .capabilities = CODEC_CAP_DR1, |
| 1102 | .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, |
| 1103 | AV_SAMPLE_FMT_NONE }, |
| 1104 | }; |
| 1105 | #endif |