00001 /* 00002 * COOK compatible decoder 00003 * Copyright (c) 2003 Sascha Sommer 00004 * Copyright (c) 2005 Benjamin Larsson 00005 * 00006 * This file is part of FFmpeg. 00007 * 00008 * FFmpeg is free software; you can redistribute it and/or 00009 * modify it under the terms of the GNU Lesser General Public 00010 * License as published by the Free Software Foundation; either 00011 * version 2.1 of the License, or (at your option) any later version. 00012 * 00013 * FFmpeg is distributed in the hope that it will be useful, 00014 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00015 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00016 * Lesser General Public License for more details. 00017 * 00018 * You should have received a copy of the GNU Lesser General Public 00019 * License along with FFmpeg; if not, write to the Free Software 00020 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00021 */ 00022 00045 #include "libavutil/lfg.h" 00046 #include "avcodec.h" 00047 #include "get_bits.h" 00048 #include "dsputil.h" 00049 #include "bytestream.h" 00050 #include "fft.h" 00051 #include "libavutil/audioconvert.h" 00052 #include "sinewin.h" 00053 00054 #include "cookdata.h" 00055 00056 /* the different Cook versions */ 00057 #define MONO 0x1000001 00058 #define STEREO 0x1000002 00059 #define JOINT_STEREO 0x1000003 00060 #define MC_COOK 0x2000000 // multichannel Cook, not supported 00061 00062 #define SUBBAND_SIZE 20 00063 #define MAX_SUBPACKETS 5 00064 00065 typedef struct { 00066 int *now; 00067 int *previous; 00068 } cook_gains; 00069 00070 typedef struct { 00071 int ch_idx; 00072 int size; 00073 int num_channels; 00074 int cookversion; 00075 int samples_per_frame; 00076 int subbands; 00077 int js_subband_start; 00078 int js_vlc_bits; 00079 int samples_per_channel; 00080 int log2_numvector_size; 00081 unsigned int channel_mask; 00082 VLC ccpl; 00083 int joint_stereo; 00084 int bits_per_subpacket; 00085 int bits_per_subpdiv; 00086 int total_subbands; 00087 int numvector_size; 00088 00089 float mono_previous_buffer1[1024]; 00090 float mono_previous_buffer2[1024]; 00092 cook_gains gains1; 00093 cook_gains gains2; 00094 int gain_1[9]; 00095 int gain_2[9]; 00096 int gain_3[9]; 00097 int gain_4[9]; 00098 } COOKSubpacket; 00099 00100 typedef struct cook { 00101 /* 00102 * The following 5 functions provide the lowlevel arithmetic on 00103 * the internal audio buffers. 00104 */ 00105 void (*scalar_dequant)(struct cook *q, int index, int quant_index, 00106 int *subband_coef_index, int *subband_coef_sign, 00107 float *mlt_p); 00108 00109 void (*decouple)(struct cook *q, 00110 COOKSubpacket *p, 00111 int subband, 00112 float f1, float f2, 00113 float *decode_buffer, 00114 float *mlt_buffer1, float *mlt_buffer2); 00115 00116 void (*imlt_window)(struct cook *q, float *buffer1, 00117 cook_gains *gains_ptr, float *previous_buffer); 00118 00119 void (*interpolate)(struct cook *q, float *buffer, 00120 int gain_index, int gain_index_next); 00121 00122 void (*saturate_output)(struct cook *q, int chan, float *out); 00123 00124 AVCodecContext* avctx; 00125 AVFrame frame; 00126 GetBitContext gb; 00127 /* stream data */ 00128 int nb_channels; 00129 int bit_rate; 00130 int sample_rate; 00131 int num_vectors; 00132 int samples_per_channel; 00133 /* states */ 00134 AVLFG random_state; 00135 int discarded_packets; 00136 00137 /* transform data */ 00138 FFTContext mdct_ctx; 00139 float* mlt_window; 00140 00141 /* VLC data */ 00142 VLC envelope_quant_index[13]; 00143 VLC sqvh[7]; // scalar quantization 00144 00145 /* generatable tables and related variables */ 00146 int gain_size_factor; 00147 float gain_table[23]; 00148 00149 /* data buffers */ 00150 00151 uint8_t* decoded_bytes_buffer; 00152 DECLARE_ALIGNED(32, float, mono_mdct_output)[2048]; 00153 float decode_buffer_1[1024]; 00154 float decode_buffer_2[1024]; 00155 float decode_buffer_0[1060]; /* static allocation for joint decode */ 00156 00157 const float *cplscales[5]; 00158 int num_subpackets; 00159 COOKSubpacket subpacket[MAX_SUBPACKETS]; 00160 } COOKContext; 00161 00162 static float pow2tab[127]; 00163 static float rootpow2tab[127]; 00164 00165 /*************** init functions ***************/ 00166 00167 /* table generator */ 00168 static av_cold void init_pow2table(void) 00169 { 00170 int i; 00171 for (i = -63; i < 64; i++) { 00172 pow2tab[63 + i] = pow(2, i); 00173 rootpow2tab[63 + i] = sqrt(pow(2, i)); 00174 } 00175 } 00176 00177 /* table generator */ 00178 static av_cold void init_gain_table(COOKContext *q) 00179 { 00180 int i; 00181 q->gain_size_factor = q->samples_per_channel / 8; 00182 for (i = 0; i < 23; i++) 00183 q->gain_table[i] = pow(pow2tab[i + 52], 00184 (1.0 / (double) q->gain_size_factor)); 00185 } 00186 00187 00188 static av_cold int init_cook_vlc_tables(COOKContext *q) 00189 { 00190 int i, result; 00191 00192 result = 0; 00193 for (i = 0; i < 13; i++) { 00194 result |= init_vlc(&q->envelope_quant_index[i], 9, 24, 00195 envelope_quant_index_huffbits[i], 1, 1, 00196 envelope_quant_index_huffcodes[i], 2, 2, 0); 00197 } 00198 av_log(q->avctx, AV_LOG_DEBUG, "sqvh VLC init\n"); 00199 for (i = 0; i < 7; i++) { 00200 result |= init_vlc(&q->sqvh[i], vhvlcsize_tab[i], vhsize_tab[i], 00201 cvh_huffbits[i], 1, 1, 00202 cvh_huffcodes[i], 2, 2, 0); 00203 } 00204 00205 for (i = 0; i < q->num_subpackets; i++) { 00206 if (q->subpacket[i].joint_stereo == 1) { 00207 result |= init_vlc(&q->subpacket[i].ccpl, 6, (1 << q->subpacket[i].js_vlc_bits) - 1, 00208 ccpl_huffbits[q->subpacket[i].js_vlc_bits - 2], 1, 1, 00209 ccpl_huffcodes[q->subpacket[i].js_vlc_bits - 2], 2, 2, 0); 00210 av_log(q->avctx, AV_LOG_DEBUG, "subpacket %i Joint-stereo VLC used.\n", i); 00211 } 00212 } 00213 00214 av_log(q->avctx, AV_LOG_DEBUG, "VLC tables initialized.\n"); 00215 return result; 00216 } 00217 00218 static av_cold int init_cook_mlt(COOKContext *q) 00219 { 00220 int j, ret; 00221 int mlt_size = q->samples_per_channel; 00222 00223 if ((q->mlt_window = av_malloc(mlt_size * sizeof(*q->mlt_window))) == 0) 00224 return AVERROR(ENOMEM); 00225 00226 /* Initialize the MLT window: simple sine window. */ 00227 ff_sine_window_init(q->mlt_window, mlt_size); 00228 for (j = 0; j < mlt_size; j++) 00229 q->mlt_window[j] *= sqrt(2.0 / q->samples_per_channel); 00230 00231 /* Initialize the MDCT. */ 00232 if ((ret = ff_mdct_init(&q->mdct_ctx, av_log2(mlt_size) + 1, 1, 1.0 / 32768.0))) { 00233 av_free(q->mlt_window); 00234 return ret; 00235 } 00236 av_log(q->avctx, AV_LOG_DEBUG, "MDCT initialized, order = %d.\n", 00237 av_log2(mlt_size) + 1); 00238 00239 return 0; 00240 } 00241 00242 static const float *maybe_reformat_buffer32(COOKContext *q, const float *ptr, int n) 00243 { 00244 if (1) 00245 return ptr; 00246 } 00247 00248 static av_cold void init_cplscales_table(COOKContext *q) 00249 { 00250 int i; 00251 for (i = 0; i < 5; i++) 00252 q->cplscales[i] = maybe_reformat_buffer32(q, cplscales[i], (1 << (i + 2)) - 1); 00253 } 00254 00255 /*************** init functions end ***********/ 00256 00257 #define DECODE_BYTES_PAD1(bytes) (3 - ((bytes) + 3) % 4) 00258 #define DECODE_BYTES_PAD2(bytes) ((bytes) % 4 + DECODE_BYTES_PAD1(2 * (bytes))) 00259 00280 static inline int decode_bytes(const uint8_t *inbuffer, uint8_t *out, int bytes) 00281 { 00282 static const uint32_t tab[4] = { 00283 AV_BE2NE32C(0x37c511f2u), AV_BE2NE32C(0xf237c511u), 00284 AV_BE2NE32C(0x11f237c5u), AV_BE2NE32C(0xc511f237u), 00285 }; 00286 int i, off; 00287 uint32_t c; 00288 const uint32_t *buf; 00289 uint32_t *obuf = (uint32_t *) out; 00290 /* FIXME: 64 bit platforms would be able to do 64 bits at a time. 00291 * I'm too lazy though, should be something like 00292 * for (i = 0; i < bitamount / 64; i++) 00293 * (int64_t) out[i] = 0x37c511f237c511f2 ^ av_be2ne64(int64_t) in[i]); 00294 * Buffer alignment needs to be checked. */ 00295 00296 off = (intptr_t) inbuffer & 3; 00297 buf = (const uint32_t *) (inbuffer - off); 00298 c = tab[off]; 00299 bytes += 3 + off; 00300 for (i = 0; i < bytes / 4; i++) 00301 obuf[i] = c ^ buf[i]; 00302 00303 return off; 00304 } 00305 00309 static av_cold int cook_decode_close(AVCodecContext *avctx) 00310 { 00311 int i; 00312 COOKContext *q = avctx->priv_data; 00313 av_log(avctx, AV_LOG_DEBUG, "Deallocating memory.\n"); 00314 00315 /* Free allocated memory buffers. */ 00316 av_free(q->mlt_window); 00317 av_free(q->decoded_bytes_buffer); 00318 00319 /* Free the transform. */ 00320 ff_mdct_end(&q->mdct_ctx); 00321 00322 /* Free the VLC tables. */ 00323 for (i = 0; i < 13; i++) 00324 ff_free_vlc(&q->envelope_quant_index[i]); 00325 for (i = 0; i < 7; i++) 00326 ff_free_vlc(&q->sqvh[i]); 00327 for (i = 0; i < q->num_subpackets; i++) 00328 ff_free_vlc(&q->subpacket[i].ccpl); 00329 00330 av_log(avctx, AV_LOG_DEBUG, "Memory deallocated.\n"); 00331 00332 return 0; 00333 } 00334 00341 static void decode_gain_info(GetBitContext *gb, int *gaininfo) 00342 { 00343 int i, n; 00344 00345 while (get_bits1(gb)) { 00346 /* NOTHING */ 00347 } 00348 00349 n = get_bits_count(gb) - 1; // amount of elements*2 to update 00350 00351 i = 0; 00352 while (n--) { 00353 int index = get_bits(gb, 3); 00354 int gain = get_bits1(gb) ? get_bits(gb, 4) - 7 : -1; 00355 00356 while (i <= index) 00357 gaininfo[i++] = gain; 00358 } 00359 while (i <= 8) 00360 gaininfo[i++] = 0; 00361 } 00362 00369 static int decode_envelope(COOKContext *q, COOKSubpacket *p, 00370 int *quant_index_table) 00371 { 00372 int i, j, vlc_index; 00373 00374 quant_index_table[0] = get_bits(&q->gb, 6) - 6; // This is used later in categorize 00375 00376 for (i = 1; i < p->total_subbands; i++) { 00377 vlc_index = i; 00378 if (i >= p->js_subband_start * 2) { 00379 vlc_index -= p->js_subband_start; 00380 } else { 00381 vlc_index /= 2; 00382 if (vlc_index < 1) 00383 vlc_index = 1; 00384 } 00385 if (vlc_index > 13) 00386 vlc_index = 13; // the VLC tables >13 are identical to No. 13 00387 00388 j = get_vlc2(&q->gb, q->envelope_quant_index[vlc_index - 1].table, 00389 q->envelope_quant_index[vlc_index - 1].bits, 2); 00390 quant_index_table[i] = quant_index_table[i - 1] + j - 12; // differential encoding 00391 if (quant_index_table[i] > 63 || quant_index_table[i] < -63) { 00392 av_log(q->avctx, AV_LOG_ERROR, 00393 "Invalid quantizer %d at position %d, outside [-63, 63] range\n", 00394 quant_index_table[i], i); 00395 return AVERROR_INVALIDDATA; 00396 } 00397 } 00398 00399 return 0; 00400 } 00401 00410 static void categorize(COOKContext *q, COOKSubpacket *p, const int *quant_index_table, 00411 int *category, int *category_index) 00412 { 00413 int exp_idx, bias, tmpbias1, tmpbias2, bits_left, num_bits, index, v, i, j; 00414 int exp_index2[102] = { 0 }; 00415 int exp_index1[102] = { 0 }; 00416 00417 int tmp_categorize_array[128 * 2] = { 0 }; 00418 int tmp_categorize_array1_idx = p->numvector_size; 00419 int tmp_categorize_array2_idx = p->numvector_size; 00420 00421 bits_left = p->bits_per_subpacket - get_bits_count(&q->gb); 00422 00423 if (bits_left > q->samples_per_channel) { 00424 bits_left = q->samples_per_channel + 00425 ((bits_left - q->samples_per_channel) * 5) / 8; 00426 //av_log(q->avctx, AV_LOG_ERROR, "bits_left = %d\n",bits_left); 00427 } 00428 00429 bias = -32; 00430 00431 /* Estimate bias. */ 00432 for (i = 32; i > 0; i = i / 2) { 00433 num_bits = 0; 00434 index = 0; 00435 for (j = p->total_subbands; j > 0; j--) { 00436 exp_idx = av_clip((i - quant_index_table[index] + bias) / 2, 0, 7); 00437 index++; 00438 num_bits += expbits_tab[exp_idx]; 00439 } 00440 if (num_bits >= bits_left - 32) 00441 bias += i; 00442 } 00443 00444 /* Calculate total number of bits. */ 00445 num_bits = 0; 00446 for (i = 0; i < p->total_subbands; i++) { 00447 exp_idx = av_clip((bias - quant_index_table[i]) / 2, 0, 7); 00448 num_bits += expbits_tab[exp_idx]; 00449 exp_index1[i] = exp_idx; 00450 exp_index2[i] = exp_idx; 00451 } 00452 tmpbias1 = tmpbias2 = num_bits; 00453 00454 for (j = 1; j < p->numvector_size; j++) { 00455 if (tmpbias1 + tmpbias2 > 2 * bits_left) { /* ---> */ 00456 int max = -999999; 00457 index = -1; 00458 for (i = 0; i < p->total_subbands; i++) { 00459 if (exp_index1[i] < 7) { 00460 v = (-2 * exp_index1[i]) - quant_index_table[i] + bias; 00461 if (v >= max) { 00462 max = v; 00463 index = i; 00464 } 00465 } 00466 } 00467 if (index == -1) 00468 break; 00469 tmp_categorize_array[tmp_categorize_array1_idx++] = index; 00470 tmpbias1 -= expbits_tab[exp_index1[index]] - 00471 expbits_tab[exp_index1[index] + 1]; 00472 ++exp_index1[index]; 00473 } else { /* <--- */ 00474 int min = 999999; 00475 index = -1; 00476 for (i = 0; i < p->total_subbands; i++) { 00477 if (exp_index2[i] > 0) { 00478 v = (-2 * exp_index2[i]) - quant_index_table[i] + bias; 00479 if (v < min) { 00480 min = v; 00481 index = i; 00482 } 00483 } 00484 } 00485 if (index == -1) 00486 break; 00487 tmp_categorize_array[--tmp_categorize_array2_idx] = index; 00488 tmpbias2 -= expbits_tab[exp_index2[index]] - 00489 expbits_tab[exp_index2[index] - 1]; 00490 --exp_index2[index]; 00491 } 00492 } 00493 00494 for (i = 0; i < p->total_subbands; i++) 00495 category[i] = exp_index2[i]; 00496 00497 for (i = 0; i < p->numvector_size - 1; i++) 00498 category_index[i] = tmp_categorize_array[tmp_categorize_array2_idx++]; 00499 } 00500 00501 00509 static inline void expand_category(COOKContext *q, int *category, 00510 int *category_index) 00511 { 00512 int i; 00513 for (i = 0; i < q->num_vectors; i++) 00514 { 00515 int idx = category_index[i]; 00516 if (++category[idx] >= FF_ARRAY_ELEMS(dither_tab)) 00517 --category[idx]; 00518 } 00519 } 00520 00531 static void scalar_dequant_float(COOKContext *q, int index, int quant_index, 00532 int *subband_coef_index, int *subband_coef_sign, 00533 float *mlt_p) 00534 { 00535 int i; 00536 float f1; 00537 00538 for (i = 0; i < SUBBAND_SIZE; i++) { 00539 if (subband_coef_index[i]) { 00540 f1 = quant_centroid_tab[index][subband_coef_index[i]]; 00541 if (subband_coef_sign[i]) 00542 f1 = -f1; 00543 } else { 00544 /* noise coding if subband_coef_index[i] == 0 */ 00545 f1 = dither_tab[index]; 00546 if (av_lfg_get(&q->random_state) < 0x80000000) 00547 f1 = -f1; 00548 } 00549 mlt_p[i] = f1 * rootpow2tab[quant_index + 63]; 00550 } 00551 } 00560 static int unpack_SQVH(COOKContext *q, COOKSubpacket *p, int category, 00561 int *subband_coef_index, int *subband_coef_sign) 00562 { 00563 int i, j; 00564 int vlc, vd, tmp, result; 00565 00566 vd = vd_tab[category]; 00567 result = 0; 00568 for (i = 0; i < vpr_tab[category]; i++) { 00569 vlc = get_vlc2(&q->gb, q->sqvh[category].table, q->sqvh[category].bits, 3); 00570 if (p->bits_per_subpacket < get_bits_count(&q->gb)) { 00571 vlc = 0; 00572 result = 1; 00573 } 00574 for (j = vd - 1; j >= 0; j--) { 00575 tmp = (vlc * invradix_tab[category]) / 0x100000; 00576 subband_coef_index[vd * i + j] = vlc - tmp * (kmax_tab[category] + 1); 00577 vlc = tmp; 00578 } 00579 for (j = 0; j < vd; j++) { 00580 if (subband_coef_index[i * vd + j]) { 00581 if (get_bits_count(&q->gb) < p->bits_per_subpacket) { 00582 subband_coef_sign[i * vd + j] = get_bits1(&q->gb); 00583 } else { 00584 result = 1; 00585 subband_coef_sign[i * vd + j] = 0; 00586 } 00587 } else { 00588 subband_coef_sign[i * vd + j] = 0; 00589 } 00590 } 00591 } 00592 return result; 00593 } 00594 00595 00604 static void decode_vectors(COOKContext *q, COOKSubpacket *p, int *category, 00605 int *quant_index_table, float *mlt_buffer) 00606 { 00607 /* A zero in this table means that the subband coefficient is 00608 random noise coded. */ 00609 int subband_coef_index[SUBBAND_SIZE]; 00610 /* A zero in this table means that the subband coefficient is a 00611 positive multiplicator. */ 00612 int subband_coef_sign[SUBBAND_SIZE]; 00613 int band, j; 00614 int index = 0; 00615 00616 for (band = 0; band < p->total_subbands; band++) { 00617 index = category[band]; 00618 if (category[band] < 7) { 00619 if (unpack_SQVH(q, p, category[band], subband_coef_index, subband_coef_sign)) { 00620 index = 7; 00621 for (j = 0; j < p->total_subbands; j++) 00622 category[band + j] = 7; 00623 } 00624 } 00625 if (index >= 7) { 00626 memset(subband_coef_index, 0, sizeof(subband_coef_index)); 00627 memset(subband_coef_sign, 0, sizeof(subband_coef_sign)); 00628 } 00629 q->scalar_dequant(q, index, quant_index_table[band], 00630 subband_coef_index, subband_coef_sign, 00631 &mlt_buffer[band * SUBBAND_SIZE]); 00632 } 00633 00634 /* FIXME: should this be removed, or moved into loop above? */ 00635 if (p->total_subbands * SUBBAND_SIZE >= q->samples_per_channel) 00636 return; 00637 } 00638 00639 00646 static int mono_decode(COOKContext *q, COOKSubpacket *p, float *mlt_buffer) 00647 { 00648 int category_index[128] = { 0 }; 00649 int category[128] = { 0 }; 00650 int quant_index_table[102]; 00651 int res, i; 00652 00653 if ((res = decode_envelope(q, p, quant_index_table)) < 0) 00654 return res; 00655 q->num_vectors = get_bits(&q->gb, p->log2_numvector_size); 00656 categorize(q, p, quant_index_table, category, category_index); 00657 expand_category(q, category, category_index); 00658 for (i=0; i<p->total_subbands; i++) { 00659 if (category[i] > 7) 00660 return AVERROR_INVALIDDATA; 00661 } 00662 decode_vectors(q, p, category, quant_index_table, mlt_buffer); 00663 00664 return 0; 00665 } 00666 00667 00676 static void interpolate_float(COOKContext *q, float *buffer, 00677 int gain_index, int gain_index_next) 00678 { 00679 int i; 00680 float fc1, fc2; 00681 fc1 = pow2tab[gain_index + 63]; 00682 00683 if (gain_index == gain_index_next) { // static gain 00684 for (i = 0; i < q->gain_size_factor; i++) 00685 buffer[i] *= fc1; 00686 } else { // smooth gain 00687 fc2 = q->gain_table[11 + (gain_index_next - gain_index)]; 00688 for (i = 0; i < q->gain_size_factor; i++) { 00689 buffer[i] *= fc1; 00690 fc1 *= fc2; 00691 } 00692 } 00693 } 00694 00703 static void imlt_window_float(COOKContext *q, float *inbuffer, 00704 cook_gains *gains_ptr, float *previous_buffer) 00705 { 00706 const float fc = pow2tab[gains_ptr->previous[0] + 63]; 00707 int i; 00708 /* The weird thing here, is that the two halves of the time domain 00709 * buffer are swapped. Also, the newest data, that we save away for 00710 * next frame, has the wrong sign. Hence the subtraction below. 00711 * Almost sounds like a complex conjugate/reverse data/FFT effect. 00712 */ 00713 00714 /* Apply window and overlap */ 00715 for (i = 0; i < q->samples_per_channel; i++) 00716 inbuffer[i] = inbuffer[i] * fc * q->mlt_window[i] - 00717 previous_buffer[i] * q->mlt_window[q->samples_per_channel - 1 - i]; 00718 } 00719 00731 static void imlt_gain(COOKContext *q, float *inbuffer, 00732 cook_gains *gains_ptr, float *previous_buffer) 00733 { 00734 float *buffer0 = q->mono_mdct_output; 00735 float *buffer1 = q->mono_mdct_output + q->samples_per_channel; 00736 int i; 00737 00738 /* Inverse modified discrete cosine transform */ 00739 q->mdct_ctx.imdct_calc(&q->mdct_ctx, q->mono_mdct_output, inbuffer); 00740 00741 q->imlt_window(q, buffer1, gains_ptr, previous_buffer); 00742 00743 /* Apply gain profile */ 00744 for (i = 0; i < 8; i++) 00745 if (gains_ptr->now[i] || gains_ptr->now[i + 1]) 00746 q->interpolate(q, &buffer1[q->gain_size_factor * i], 00747 gains_ptr->now[i], gains_ptr->now[i + 1]); 00748 00749 /* Save away the current to be previous block. */ 00750 memcpy(previous_buffer, buffer0, 00751 q->samples_per_channel * sizeof(*previous_buffer)); 00752 } 00753 00754 00762 static int decouple_info(COOKContext *q, COOKSubpacket *p, int *decouple_tab) 00763 { 00764 int i; 00765 int vlc = get_bits1(&q->gb); 00766 int start = cplband[p->js_subband_start]; 00767 int end = cplband[p->subbands - 1]; 00768 int length = end - start + 1; 00769 00770 if (start > end) 00771 return 0; 00772 00773 if (vlc) 00774 for (i = 0; i < length; i++) 00775 decouple_tab[start + i] = get_vlc2(&q->gb, p->ccpl.table, p->ccpl.bits, 2); 00776 else 00777 for (i = 0; i < length; i++) { 00778 int v = get_bits(&q->gb, p->js_vlc_bits); 00779 if (v == (1<<p->js_vlc_bits)-1) { 00780 av_log(q->avctx, AV_LOG_ERROR, "decouple value too large\n"); 00781 return AVERROR_INVALIDDATA; 00782 } 00783 decouple_tab[start + i] = v; 00784 } 00785 return 0; 00786 } 00787 00788 /* 00789 * function decouples a pair of signals from a single signal via multiplication. 00790 * 00791 * @param q pointer to the COOKContext 00792 * @param subband index of the current subband 00793 * @param f1 multiplier for channel 1 extraction 00794 * @param f2 multiplier for channel 2 extraction 00795 * @param decode_buffer input buffer 00796 * @param mlt_buffer1 pointer to left channel mlt coefficients 00797 * @param mlt_buffer2 pointer to right channel mlt coefficients 00798 */ 00799 static void decouple_float(COOKContext *q, 00800 COOKSubpacket *p, 00801 int subband, 00802 float f1, float f2, 00803 float *decode_buffer, 00804 float *mlt_buffer1, float *mlt_buffer2) 00805 { 00806 int j, tmp_idx; 00807 for (j = 0; j < SUBBAND_SIZE; j++) { 00808 tmp_idx = ((p->js_subband_start + subband) * SUBBAND_SIZE) + j; 00809 mlt_buffer1[SUBBAND_SIZE * subband + j] = f1 * decode_buffer[tmp_idx]; 00810 mlt_buffer2[SUBBAND_SIZE * subband + j] = f2 * decode_buffer[tmp_idx]; 00811 } 00812 } 00813 00821 static int joint_decode(COOKContext *q, COOKSubpacket *p, float *mlt_buffer1, 00822 float *mlt_buffer2) 00823 { 00824 int i, j, res; 00825 int decouple_tab[SUBBAND_SIZE] = { 0 }; 00826 float *decode_buffer = q->decode_buffer_0; 00827 int idx, cpl_tmp; 00828 float f1, f2; 00829 const float *cplscale; 00830 00831 memset(decode_buffer, 0, sizeof(q->decode_buffer_0)); 00832 00833 /* Make sure the buffers are zeroed out. */ 00834 memset(mlt_buffer1, 0, 1024 * sizeof(*mlt_buffer1)); 00835 memset(mlt_buffer2, 0, 1024 * sizeof(*mlt_buffer2)); 00836 if ((res = decouple_info(q, p, decouple_tab)) < 0) 00837 return res; 00838 if ((res = mono_decode(q, p, decode_buffer)) < 0) 00839 return res; 00840 /* The two channels are stored interleaved in decode_buffer. */ 00841 for (i = 0; i < p->js_subband_start; i++) { 00842 for (j = 0; j < SUBBAND_SIZE; j++) { 00843 mlt_buffer1[i * 20 + j] = decode_buffer[i * 40 + j]; 00844 mlt_buffer2[i * 20 + j] = decode_buffer[i * 40 + 20 + j]; 00845 } 00846 } 00847 00848 /* When we reach js_subband_start (the higher frequencies) 00849 the coefficients are stored in a coupling scheme. */ 00850 idx = (1 << p->js_vlc_bits) - 1; 00851 for (i = p->js_subband_start; i < p->subbands; i++) { 00852 cpl_tmp = cplband[i]; 00853 idx -= decouple_tab[cpl_tmp]; 00854 cplscale = q->cplscales[p->js_vlc_bits - 2]; // choose decoupler table 00855 f1 = cplscale[decouple_tab[cpl_tmp] + 1]; 00856 f2 = cplscale[idx]; 00857 q->decouple(q, p, i, f1, f2, decode_buffer, mlt_buffer1, mlt_buffer2); 00858 idx = (1 << p->js_vlc_bits) - 1; 00859 } 00860 00861 return 0; 00862 } 00863 00872 static inline void decode_bytes_and_gain(COOKContext *q, COOKSubpacket *p, 00873 const uint8_t *inbuffer, 00874 cook_gains *gains_ptr) 00875 { 00876 int offset; 00877 00878 offset = decode_bytes(inbuffer, q->decoded_bytes_buffer, 00879 p->bits_per_subpacket / 8); 00880 init_get_bits(&q->gb, q->decoded_bytes_buffer + offset, 00881 p->bits_per_subpacket); 00882 decode_gain_info(&q->gb, gains_ptr->now); 00883 00884 /* Swap current and previous gains */ 00885 FFSWAP(int *, gains_ptr->now, gains_ptr->previous); 00886 } 00887 00895 static void saturate_output_float(COOKContext *q, int chan, float *out) 00896 { 00897 int j; 00898 float *output = q->mono_mdct_output + q->samples_per_channel; 00899 for (j = 0; j < q->samples_per_channel; j++) { 00900 out[chan + q->nb_channels * j] = av_clipf(output[j], -1.0, 1.0); 00901 } 00902 } 00903 00916 static inline void mlt_compensate_output(COOKContext *q, float *decode_buffer, 00917 cook_gains *gains_ptr, float *previous_buffer, 00918 float *out, int chan) 00919 { 00920 imlt_gain(q, decode_buffer, gains_ptr, previous_buffer); 00921 if (out) 00922 q->saturate_output(q, chan, out); 00923 } 00924 00925 00934 static int decode_subpacket(COOKContext *q, COOKSubpacket *p, 00935 const uint8_t *inbuffer, float *outbuffer) 00936 { 00937 int sub_packet_size = p->size; 00938 int res; 00939 /* packet dump */ 00940 // for (i = 0; i < sub_packet_size ; i++) 00941 // av_log(q->avctx, AV_LOG_ERROR, "%02x", inbuffer[i]); 00942 // av_log(q->avctx, AV_LOG_ERROR, "\n"); 00943 memset(q->decode_buffer_1, 0, sizeof(q->decode_buffer_1)); 00944 decode_bytes_and_gain(q, p, inbuffer, &p->gains1); 00945 00946 if (p->joint_stereo) { 00947 if ((res = joint_decode(q, p, q->decode_buffer_1, q->decode_buffer_2)) < 0) 00948 return res; 00949 } else { 00950 if ((res = mono_decode(q, p, q->decode_buffer_1)) < 0) 00951 return res; 00952 00953 if (p->num_channels == 2) { 00954 decode_bytes_and_gain(q, p, inbuffer + sub_packet_size / 2, &p->gains2); 00955 if ((res = mono_decode(q, p, q->decode_buffer_2)) < 0) 00956 return res; 00957 } 00958 } 00959 00960 mlt_compensate_output(q, q->decode_buffer_1, &p->gains1, 00961 p->mono_previous_buffer1, outbuffer, p->ch_idx); 00962 00963 if (p->num_channels == 2) 00964 if (p->joint_stereo) 00965 mlt_compensate_output(q, q->decode_buffer_2, &p->gains1, 00966 p->mono_previous_buffer2, outbuffer, p->ch_idx + 1); 00967 else 00968 mlt_compensate_output(q, q->decode_buffer_2, &p->gains2, 00969 p->mono_previous_buffer2, outbuffer, p->ch_idx + 1); 00970 00971 return 0; 00972 } 00973 00974 00980 static int cook_decode_frame(AVCodecContext *avctx, void *data, 00981 int *got_frame_ptr, AVPacket *avpkt) 00982 { 00983 const uint8_t *buf = avpkt->data; 00984 int buf_size = avpkt->size; 00985 COOKContext *q = avctx->priv_data; 00986 float *samples = NULL; 00987 int i, ret; 00988 int offset = 0; 00989 int chidx = 0; 00990 00991 if (buf_size < avctx->block_align) 00992 return buf_size; 00993 00994 /* get output buffer */ 00995 if (q->discarded_packets >= 2) { 00996 q->frame.nb_samples = q->samples_per_channel; 00997 if ((ret = avctx->get_buffer(avctx, &q->frame)) < 0) { 00998 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); 00999 return ret; 01000 } 01001 samples = (float *) q->frame.data[0]; 01002 } 01003 01004 /* estimate subpacket sizes */ 01005 q->subpacket[0].size = avctx->block_align; 01006 01007 for (i = 1; i < q->num_subpackets; i++) { 01008 q->subpacket[i].size = 2 * buf[avctx->block_align - q->num_subpackets + i]; 01009 q->subpacket[0].size -= q->subpacket[i].size + 1; 01010 if (q->subpacket[0].size < 0) { 01011 av_log(avctx, AV_LOG_DEBUG, 01012 "frame subpacket size total > avctx->block_align!\n"); 01013 return AVERROR_INVALIDDATA; 01014 } 01015 } 01016 01017 /* decode supbackets */ 01018 for (i = 0; i < q->num_subpackets; i++) { 01019 q->subpacket[i].bits_per_subpacket = (q->subpacket[i].size * 8) >> 01020 q->subpacket[i].bits_per_subpdiv; 01021 q->subpacket[i].ch_idx = chidx; 01022 av_log(avctx, AV_LOG_DEBUG, 01023 "subpacket[%i] size %i js %i %i block_align %i\n", 01024 i, q->subpacket[i].size, q->subpacket[i].joint_stereo, offset, 01025 avctx->block_align); 01026 01027 if ((ret = decode_subpacket(q, &q->subpacket[i], buf + offset, samples)) < 0) 01028 return ret; 01029 offset += q->subpacket[i].size; 01030 chidx += q->subpacket[i].num_channels; 01031 av_log(avctx, AV_LOG_DEBUG, "subpacket[%i] %i %i\n", 01032 i, q->subpacket[i].size * 8, get_bits_count(&q->gb)); 01033 } 01034 01035 /* Discard the first two frames: no valid audio. */ 01036 if (q->discarded_packets < 2) { 01037 q->discarded_packets++; 01038 *got_frame_ptr = 0; 01039 return avctx->block_align; 01040 } 01041 01042 *got_frame_ptr = 1; 01043 *(AVFrame *) data = q->frame; 01044 01045 return avctx->block_align; 01046 } 01047 01048 #ifdef DEBUG 01049 static void dump_cook_context(COOKContext *q) 01050 { 01051 //int i=0; 01052 #define PRINT(a, b) av_log(q->avctx, AV_LOG_ERROR, " %s = %d\n", a, b); 01053 av_log(q->avctx, AV_LOG_ERROR, "COOKextradata\n"); 01054 av_log(q->avctx, AV_LOG_ERROR, "cookversion=%x\n", q->subpacket[0].cookversion); 01055 if (q->subpacket[0].cookversion > STEREO) { 01056 PRINT("js_subband_start", q->subpacket[0].js_subband_start); 01057 PRINT("js_vlc_bits", q->subpacket[0].js_vlc_bits); 01058 } 01059 av_log(q->avctx, AV_LOG_ERROR, "COOKContext\n"); 01060 PRINT("nb_channels", q->nb_channels); 01061 PRINT("bit_rate", q->bit_rate); 01062 PRINT("sample_rate", q->sample_rate); 01063 PRINT("samples_per_channel", q->subpacket[0].samples_per_channel); 01064 PRINT("samples_per_frame", q->subpacket[0].samples_per_frame); 01065 PRINT("subbands", q->subpacket[0].subbands); 01066 PRINT("js_subband_start", q->subpacket[0].js_subband_start); 01067 PRINT("log2_numvector_size", q->subpacket[0].log2_numvector_size); 01068 PRINT("numvector_size", q->subpacket[0].numvector_size); 01069 PRINT("total_subbands", q->subpacket[0].total_subbands); 01070 } 01071 #endif 01072 01073 static av_cold int cook_count_channels(unsigned int mask) 01074 { 01075 int i; 01076 int channels = 0; 01077 for (i = 0; i < 32; i++) 01078 if (mask & (1 << i)) 01079 ++channels; 01080 return channels; 01081 } 01082 01088 static av_cold int cook_decode_init(AVCodecContext *avctx) 01089 { 01090 COOKContext *q = avctx->priv_data; 01091 const uint8_t *edata_ptr = avctx->extradata; 01092 const uint8_t *edata_ptr_end = edata_ptr + avctx->extradata_size; 01093 int extradata_size = avctx->extradata_size; 01094 int s = 0; 01095 unsigned int channel_mask = 0; 01096 int ret; 01097 q->avctx = avctx; 01098 01099 /* Take care of the codec specific extradata. */ 01100 if (extradata_size <= 0) { 01101 av_log(avctx, AV_LOG_ERROR, "Necessary extradata missing!\n"); 01102 return AVERROR_INVALIDDATA; 01103 } 01104 av_log(avctx, AV_LOG_DEBUG, "codecdata_length=%d\n", avctx->extradata_size); 01105 01106 /* Take data from the AVCodecContext (RM container). */ 01107 q->sample_rate = avctx->sample_rate; 01108 q->nb_channels = avctx->channels; 01109 q->bit_rate = avctx->bit_rate; 01110 if (!q->nb_channels) { 01111 av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n"); 01112 return AVERROR_INVALIDDATA; 01113 } 01114 01115 /* Initialize RNG. */ 01116 av_lfg_init(&q->random_state, 0); 01117 01118 while (edata_ptr < edata_ptr_end) { 01119 /* 8 for mono, 16 for stereo, ? for multichannel 01120 Swap to right endianness so we don't need to care later on. */ 01121 if (extradata_size >= 8) { 01122 q->subpacket[s].cookversion = bytestream_get_be32(&edata_ptr); 01123 q->subpacket[s].samples_per_frame = bytestream_get_be16(&edata_ptr); 01124 q->subpacket[s].subbands = bytestream_get_be16(&edata_ptr); 01125 extradata_size -= 8; 01126 } 01127 if (extradata_size >= 8) { 01128 bytestream_get_be32(&edata_ptr); // Unknown unused 01129 q->subpacket[s].js_subband_start = bytestream_get_be16(&edata_ptr); 01130 q->subpacket[s].js_vlc_bits = bytestream_get_be16(&edata_ptr); 01131 extradata_size -= 8; 01132 } 01133 01134 /* Initialize extradata related variables. */ 01135 q->subpacket[s].samples_per_channel = q->subpacket[s].samples_per_frame / q->nb_channels; 01136 q->subpacket[s].bits_per_subpacket = avctx->block_align * 8; 01137 01138 /* Initialize default data states. */ 01139 q->subpacket[s].log2_numvector_size = 5; 01140 q->subpacket[s].total_subbands = q->subpacket[s].subbands; 01141 q->subpacket[s].num_channels = 1; 01142 01143 /* Initialize version-dependent variables */ 01144 01145 av_log(avctx, AV_LOG_DEBUG, "subpacket[%i].cookversion=%x\n", s, 01146 q->subpacket[s].cookversion); 01147 q->subpacket[s].joint_stereo = 0; 01148 switch (q->subpacket[s].cookversion) { 01149 case MONO: 01150 if (q->nb_channels != 1) { 01151 av_log_ask_for_sample(avctx, "Container channels != 1.\n"); 01152 return AVERROR_PATCHWELCOME; 01153 } 01154 av_log(avctx, AV_LOG_DEBUG, "MONO\n"); 01155 break; 01156 case STEREO: 01157 if (q->nb_channels != 1) { 01158 q->subpacket[s].bits_per_subpdiv = 1; 01159 q->subpacket[s].num_channels = 2; 01160 } 01161 av_log(avctx, AV_LOG_DEBUG, "STEREO\n"); 01162 break; 01163 case JOINT_STEREO: 01164 if (q->nb_channels != 2) { 01165 av_log_ask_for_sample(avctx, "Container channels != 2.\n"); 01166 return AVERROR_PATCHWELCOME; 01167 } 01168 av_log(avctx, AV_LOG_DEBUG, "JOINT_STEREO\n"); 01169 if (avctx->extradata_size >= 16) { 01170 q->subpacket[s].total_subbands = q->subpacket[s].subbands + 01171 q->subpacket[s].js_subband_start; 01172 q->subpacket[s].joint_stereo = 1; 01173 q->subpacket[s].num_channels = 2; 01174 } 01175 if (q->subpacket[s].samples_per_channel > 256) { 01176 q->subpacket[s].log2_numvector_size = 6; 01177 } 01178 if (q->subpacket[s].samples_per_channel > 512) { 01179 q->subpacket[s].log2_numvector_size = 7; 01180 } 01181 break; 01182 case MC_COOK: 01183 av_log(avctx, AV_LOG_DEBUG, "MULTI_CHANNEL\n"); 01184 if (extradata_size >= 4) 01185 channel_mask |= q->subpacket[s].channel_mask = bytestream_get_be32(&edata_ptr); 01186 01187 if (cook_count_channels(q->subpacket[s].channel_mask) > 1) { 01188 q->subpacket[s].total_subbands = q->subpacket[s].subbands + 01189 q->subpacket[s].js_subband_start; 01190 q->subpacket[s].joint_stereo = 1; 01191 q->subpacket[s].num_channels = 2; 01192 q->subpacket[s].samples_per_channel = q->subpacket[s].samples_per_frame >> 1; 01193 01194 if (q->subpacket[s].samples_per_channel > 256) { 01195 q->subpacket[s].log2_numvector_size = 6; 01196 } 01197 if (q->subpacket[s].samples_per_channel > 512) { 01198 q->subpacket[s].log2_numvector_size = 7; 01199 } 01200 } else 01201 q->subpacket[s].samples_per_channel = q->subpacket[s].samples_per_frame; 01202 01203 break; 01204 default: 01205 av_log_ask_for_sample(avctx, "Unknown Cook version.\n"); 01206 return AVERROR_PATCHWELCOME; 01207 } 01208 01209 if (s > 1 && q->subpacket[s].samples_per_channel != q->samples_per_channel) { 01210 av_log(avctx, AV_LOG_ERROR, "different number of samples per channel!\n"); 01211 return AVERROR_INVALIDDATA; 01212 } else 01213 q->samples_per_channel = q->subpacket[0].samples_per_channel; 01214 01215 01216 /* Initialize variable relations */ 01217 q->subpacket[s].numvector_size = (1 << q->subpacket[s].log2_numvector_size); 01218 01219 /* Try to catch some obviously faulty streams, othervise it might be exploitable */ 01220 if (q->subpacket[s].total_subbands > 53) { 01221 av_log_ask_for_sample(avctx, "total_subbands > 53\n"); 01222 return AVERROR_PATCHWELCOME; 01223 } 01224 01225 if ((q->subpacket[s].js_vlc_bits > 6) || 01226 (q->subpacket[s].js_vlc_bits < 2 * q->subpacket[s].joint_stereo)) { 01227 av_log(avctx, AV_LOG_ERROR, "js_vlc_bits = %d, only >= %d and <= 6 allowed!\n", 01228 q->subpacket[s].js_vlc_bits, 2 * q->subpacket[s].joint_stereo); 01229 return AVERROR_INVALIDDATA; 01230 } 01231 01232 if (q->subpacket[s].subbands > 50) { 01233 av_log_ask_for_sample(avctx, "subbands > 50\n"); 01234 return AVERROR_PATCHWELCOME; 01235 } 01236 q->subpacket[s].gains1.now = q->subpacket[s].gain_1; 01237 q->subpacket[s].gains1.previous = q->subpacket[s].gain_2; 01238 q->subpacket[s].gains2.now = q->subpacket[s].gain_3; 01239 q->subpacket[s].gains2.previous = q->subpacket[s].gain_4; 01240 01241 if (q->num_subpackets + q->subpacket[s].num_channels > q->nb_channels) { 01242 av_log(avctx, AV_LOG_ERROR, "Too many subpackets %d for channels %d\n", q->num_subpackets, q->nb_channels); 01243 return AVERROR_INVALIDDATA; 01244 } 01245 01246 q->num_subpackets++; 01247 s++; 01248 if (s > MAX_SUBPACKETS) { 01249 av_log_ask_for_sample(avctx, "Too many subpackets > 5\n"); 01250 return AVERROR_PATCHWELCOME; 01251 } 01252 } 01253 /* Generate tables */ 01254 init_pow2table(); 01255 init_gain_table(q); 01256 init_cplscales_table(q); 01257 01258 if ((ret = init_cook_vlc_tables(q))) 01259 return ret; 01260 01261 01262 if (avctx->block_align >= UINT_MAX / 2) 01263 return AVERROR(EINVAL); 01264 01265 /* Pad the databuffer with: 01266 DECODE_BYTES_PAD1 or DECODE_BYTES_PAD2 for decode_bytes(), 01267 FF_INPUT_BUFFER_PADDING_SIZE, for the bitstreamreader. */ 01268 q->decoded_bytes_buffer = 01269 av_mallocz(avctx->block_align 01270 + DECODE_BYTES_PAD1(avctx->block_align) 01271 + FF_INPUT_BUFFER_PADDING_SIZE); 01272 if (q->decoded_bytes_buffer == NULL) 01273 return AVERROR(ENOMEM); 01274 01275 /* Initialize transform. */ 01276 if ((ret = init_cook_mlt(q))) 01277 return ret; 01278 01279 /* Initialize COOK signal arithmetic handling */ 01280 if (1) { 01281 q->scalar_dequant = scalar_dequant_float; 01282 q->decouple = decouple_float; 01283 q->imlt_window = imlt_window_float; 01284 q->interpolate = interpolate_float; 01285 q->saturate_output = saturate_output_float; 01286 } 01287 01288 /* Try to catch some obviously faulty streams, othervise it might be exploitable */ 01289 if ((q->samples_per_channel == 256) || (q->samples_per_channel == 512) 01290 || (q->samples_per_channel == 1024)) { 01291 } else { 01292 av_log_ask_for_sample(avctx, 01293 "unknown amount of samples_per_channel = %d\n", 01294 q->samples_per_channel); 01295 return AVERROR_PATCHWELCOME; 01296 } 01297 01298 avctx->sample_fmt = AV_SAMPLE_FMT_FLT; 01299 if (channel_mask) 01300 avctx->channel_layout = channel_mask; 01301 else 01302 avctx->channel_layout = (avctx->channels == 2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO; 01303 01304 avcodec_get_frame_defaults(&q->frame); 01305 avctx->coded_frame = &q->frame; 01306 01307 #ifdef DEBUG 01308 dump_cook_context(q); 01309 #endif 01310 return 0; 01311 } 01312 01313 AVCodec ff_cook_decoder = { 01314 .name = "cook", 01315 .type = AVMEDIA_TYPE_AUDIO, 01316 .id = AV_CODEC_ID_COOK, 01317 .priv_data_size = sizeof(COOKContext), 01318 .init = cook_decode_init, 01319 .close = cook_decode_close, 01320 .decode = cook_decode_frame, 01321 .capabilities = CODEC_CAP_DR1, 01322 .long_name = NULL_IF_CONFIG_SMALL("Cook / Cooker / Gecko (RealAudio G2)"), 01323 };