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00032 #include "avcodec.h"
00033 #include "get_bits.h"
00034 #include "unary.h"
00035 #include "mpeg4audio.h"
00036 #include "bytestream.h"
00037 #include "bgmc.h"
00038 #include "dsputil.h"
00039 #include "internal.h"
00040 #include "libavutil/samplefmt.h"
00041 #include "libavutil/crc.h"
00042
00043 #include <stdint.h>
00044
00049 static const int8_t parcor_rice_table[3][20][2] = {
00050 { {-52, 4}, {-29, 5}, {-31, 4}, { 19, 4}, {-16, 4},
00051 { 12, 3}, { -7, 3}, { 9, 3}, { -5, 3}, { 6, 3},
00052 { -4, 3}, { 3, 3}, { -3, 2}, { 3, 2}, { -2, 2},
00053 { 3, 2}, { -1, 2}, { 2, 2}, { -1, 2}, { 2, 2} },
00054 { {-58, 3}, {-42, 4}, {-46, 4}, { 37, 5}, {-36, 4},
00055 { 29, 4}, {-29, 4}, { 25, 4}, {-23, 4}, { 20, 4},
00056 {-17, 4}, { 16, 4}, {-12, 4}, { 12, 3}, {-10, 4},
00057 { 7, 3}, { -4, 4}, { 3, 3}, { -1, 3}, { 1, 3} },
00058 { {-59, 3}, {-45, 5}, {-50, 4}, { 38, 4}, {-39, 4},
00059 { 32, 4}, {-30, 4}, { 25, 3}, {-23, 3}, { 20, 3},
00060 {-20, 3}, { 16, 3}, {-13, 3}, { 10, 3}, { -7, 3},
00061 { 3, 3}, { 0, 3}, { -1, 3}, { 2, 3}, { -1, 2} }
00062 };
00063
00064
00070 static const int16_t parcor_scaled_values[] = {
00071 -1048544 / 32, -1048288 / 32, -1047776 / 32, -1047008 / 32,
00072 -1045984 / 32, -1044704 / 32, -1043168 / 32, -1041376 / 32,
00073 -1039328 / 32, -1037024 / 32, -1034464 / 32, -1031648 / 32,
00074 -1028576 / 32, -1025248 / 32, -1021664 / 32, -1017824 / 32,
00075 -1013728 / 32, -1009376 / 32, -1004768 / 32, -999904 / 32,
00076 -994784 / 32, -989408 / 32, -983776 / 32, -977888 / 32,
00077 -971744 / 32, -965344 / 32, -958688 / 32, -951776 / 32,
00078 -944608 / 32, -937184 / 32, -929504 / 32, -921568 / 32,
00079 -913376 / 32, -904928 / 32, -896224 / 32, -887264 / 32,
00080 -878048 / 32, -868576 / 32, -858848 / 32, -848864 / 32,
00081 -838624 / 32, -828128 / 32, -817376 / 32, -806368 / 32,
00082 -795104 / 32, -783584 / 32, -771808 / 32, -759776 / 32,
00083 -747488 / 32, -734944 / 32, -722144 / 32, -709088 / 32,
00084 -695776 / 32, -682208 / 32, -668384 / 32, -654304 / 32,
00085 -639968 / 32, -625376 / 32, -610528 / 32, -595424 / 32,
00086 -580064 / 32, -564448 / 32, -548576 / 32, -532448 / 32,
00087 -516064 / 32, -499424 / 32, -482528 / 32, -465376 / 32,
00088 -447968 / 32, -430304 / 32, -412384 / 32, -394208 / 32,
00089 -375776 / 32, -357088 / 32, -338144 / 32, -318944 / 32,
00090 -299488 / 32, -279776 / 32, -259808 / 32, -239584 / 32,
00091 -219104 / 32, -198368 / 32, -177376 / 32, -156128 / 32,
00092 -134624 / 32, -112864 / 32, -90848 / 32, -68576 / 32,
00093 -46048 / 32, -23264 / 32, -224 / 32, 23072 / 32,
00094 46624 / 32, 70432 / 32, 94496 / 32, 118816 / 32,
00095 143392 / 32, 168224 / 32, 193312 / 32, 218656 / 32,
00096 244256 / 32, 270112 / 32, 296224 / 32, 322592 / 32,
00097 349216 / 32, 376096 / 32, 403232 / 32, 430624 / 32,
00098 458272 / 32, 486176 / 32, 514336 / 32, 542752 / 32,
00099 571424 / 32, 600352 / 32, 629536 / 32, 658976 / 32,
00100 688672 / 32, 718624 / 32, 748832 / 32, 779296 / 32,
00101 810016 / 32, 840992 / 32, 872224 / 32, 903712 / 32,
00102 935456 / 32, 967456 / 32, 999712 / 32, 1032224 / 32
00103 };
00104
00105
00109 static const uint8_t ltp_gain_values [4][4] = {
00110 { 0, 8, 16, 24},
00111 {32, 40, 48, 56},
00112 {64, 70, 76, 82},
00113 {88, 92, 96, 100}
00114 };
00115
00116
00120 static const int16_t mcc_weightings[] = {
00121 204, 192, 179, 166, 153, 140, 128, 115,
00122 102, 89, 76, 64, 51, 38, 25, 12,
00123 0, -12, -25, -38, -51, -64, -76, -89,
00124 -102, -115, -128, -140, -153, -166, -179, -192
00125 };
00126
00127
00130 static const uint8_t tail_code[16][6] = {
00131 { 74, 44, 25, 13, 7, 3},
00132 { 68, 42, 24, 13, 7, 3},
00133 { 58, 39, 23, 13, 7, 3},
00134 {126, 70, 37, 19, 10, 5},
00135 {132, 70, 37, 20, 10, 5},
00136 {124, 70, 38, 20, 10, 5},
00137 {120, 69, 37, 20, 11, 5},
00138 {116, 67, 37, 20, 11, 5},
00139 {108, 66, 36, 20, 10, 5},
00140 {102, 62, 36, 20, 10, 5},
00141 { 88, 58, 34, 19, 10, 5},
00142 {162, 89, 49, 25, 13, 7},
00143 {156, 87, 49, 26, 14, 7},
00144 {150, 86, 47, 26, 14, 7},
00145 {142, 84, 47, 26, 14, 7},
00146 {131, 79, 46, 26, 14, 7}
00147 };
00148
00149
00150 enum RA_Flag {
00151 RA_FLAG_NONE,
00152 RA_FLAG_FRAMES,
00153 RA_FLAG_HEADER
00154 };
00155
00156
00157 typedef struct {
00158 uint32_t samples;
00159 int resolution;
00160 int floating;
00161 int msb_first;
00162 int frame_length;
00163 int ra_distance;
00164 enum RA_Flag ra_flag;
00165 int adapt_order;
00166 int coef_table;
00167 int long_term_prediction;
00168 int max_order;
00169 int block_switching;
00170 int bgmc;
00171 int sb_part;
00172 int joint_stereo;
00173 int mc_coding;
00174 int chan_config;
00175 int chan_sort;
00176 int rlslms;
00177 int chan_config_info;
00178 int *chan_pos;
00179 int crc_enabled;
00180 } ALSSpecificConfig;
00181
00182
00183 typedef struct {
00184 int stop_flag;
00185 int master_channel;
00186 int time_diff_flag;
00187 int time_diff_sign;
00188 int time_diff_index;
00189 int weighting[6];
00190 } ALSChannelData;
00191
00192
00193 typedef struct {
00194 AVCodecContext *avctx;
00195 AVFrame frame;
00196 ALSSpecificConfig sconf;
00197 GetBitContext gb;
00198 DSPContext dsp;
00199 const AVCRC *crc_table;
00200 uint32_t crc_org;
00201 uint32_t crc;
00202 unsigned int cur_frame_length;
00203 unsigned int frame_id;
00204 unsigned int js_switch;
00205 unsigned int num_blocks;
00206 unsigned int s_max;
00207 uint8_t *bgmc_lut;
00208 int *bgmc_lut_status;
00209 int ltp_lag_length;
00210 int *const_block;
00211 unsigned int *shift_lsbs;
00212 unsigned int *opt_order;
00213 int *store_prev_samples;
00214 int *use_ltp;
00215 int *ltp_lag;
00216 int **ltp_gain;
00217 int *ltp_gain_buffer;
00218 int32_t **quant_cof;
00219 int32_t *quant_cof_buffer;
00220 int32_t **lpc_cof;
00221 int32_t *lpc_cof_buffer;
00222 int32_t *lpc_cof_reversed_buffer;
00223 ALSChannelData **chan_data;
00224 ALSChannelData *chan_data_buffer;
00225 int *reverted_channels;
00226 int32_t *prev_raw_samples;
00227 int32_t **raw_samples;
00228 int32_t *raw_buffer;
00229 uint8_t *crc_buffer;
00230 } ALSDecContext;
00231
00232
00233 typedef struct {
00234 unsigned int block_length;
00235 unsigned int ra_block;
00236 int *const_block;
00237 int js_blocks;
00238 unsigned int *shift_lsbs;
00239 unsigned int *opt_order;
00240 int *store_prev_samples;
00241 int *use_ltp;
00242 int *ltp_lag;
00243 int *ltp_gain;
00244 int32_t *quant_cof;
00245 int32_t *lpc_cof;
00246 int32_t *raw_samples;
00247 int32_t *prev_raw_samples;
00248 int32_t *raw_other;
00249 } ALSBlockData;
00250
00251
00252 static av_cold void dprint_specific_config(ALSDecContext *ctx)
00253 {
00254 #ifdef DEBUG
00255 AVCodecContext *avctx = ctx->avctx;
00256 ALSSpecificConfig *sconf = &ctx->sconf;
00257
00258 av_dlog(avctx, "resolution = %i\n", sconf->resolution);
00259 av_dlog(avctx, "floating = %i\n", sconf->floating);
00260 av_dlog(avctx, "frame_length = %i\n", sconf->frame_length);
00261 av_dlog(avctx, "ra_distance = %i\n", sconf->ra_distance);
00262 av_dlog(avctx, "ra_flag = %i\n", sconf->ra_flag);
00263 av_dlog(avctx, "adapt_order = %i\n", sconf->adapt_order);
00264 av_dlog(avctx, "coef_table = %i\n", sconf->coef_table);
00265 av_dlog(avctx, "long_term_prediction = %i\n", sconf->long_term_prediction);
00266 av_dlog(avctx, "max_order = %i\n", sconf->max_order);
00267 av_dlog(avctx, "block_switching = %i\n", sconf->block_switching);
00268 av_dlog(avctx, "bgmc = %i\n", sconf->bgmc);
00269 av_dlog(avctx, "sb_part = %i\n", sconf->sb_part);
00270 av_dlog(avctx, "joint_stereo = %i\n", sconf->joint_stereo);
00271 av_dlog(avctx, "mc_coding = %i\n", sconf->mc_coding);
00272 av_dlog(avctx, "chan_config = %i\n", sconf->chan_config);
00273 av_dlog(avctx, "chan_sort = %i\n", sconf->chan_sort);
00274 av_dlog(avctx, "RLSLMS = %i\n", sconf->rlslms);
00275 av_dlog(avctx, "chan_config_info = %i\n", sconf->chan_config_info);
00276 #endif
00277 }
00278
00279
00282 static av_cold int read_specific_config(ALSDecContext *ctx)
00283 {
00284 GetBitContext gb;
00285 uint64_t ht_size;
00286 int i, config_offset;
00287 MPEG4AudioConfig m4ac;
00288 ALSSpecificConfig *sconf = &ctx->sconf;
00289 AVCodecContext *avctx = ctx->avctx;
00290 uint32_t als_id, header_size, trailer_size;
00291
00292 init_get_bits(&gb, avctx->extradata, avctx->extradata_size * 8);
00293
00294 config_offset = avpriv_mpeg4audio_get_config(&m4ac, avctx->extradata,
00295 avctx->extradata_size * 8, 1);
00296
00297 if (config_offset < 0)
00298 return -1;
00299
00300 skip_bits_long(&gb, config_offset);
00301
00302 if (get_bits_left(&gb) < (30 << 3))
00303 return -1;
00304
00305
00306 als_id = get_bits_long(&gb, 32);
00307 avctx->sample_rate = m4ac.sample_rate;
00308 skip_bits_long(&gb, 32);
00309 sconf->samples = get_bits_long(&gb, 32);
00310 avctx->channels = m4ac.channels;
00311 skip_bits(&gb, 16);
00312 skip_bits(&gb, 3);
00313 sconf->resolution = get_bits(&gb, 3);
00314 sconf->floating = get_bits1(&gb);
00315 sconf->msb_first = get_bits1(&gb);
00316 sconf->frame_length = get_bits(&gb, 16) + 1;
00317 sconf->ra_distance = get_bits(&gb, 8);
00318 sconf->ra_flag = get_bits(&gb, 2);
00319 sconf->adapt_order = get_bits1(&gb);
00320 sconf->coef_table = get_bits(&gb, 2);
00321 sconf->long_term_prediction = get_bits1(&gb);
00322 sconf->max_order = get_bits(&gb, 10);
00323 sconf->block_switching = get_bits(&gb, 2);
00324 sconf->bgmc = get_bits1(&gb);
00325 sconf->sb_part = get_bits1(&gb);
00326 sconf->joint_stereo = get_bits1(&gb);
00327 sconf->mc_coding = get_bits1(&gb);
00328 sconf->chan_config = get_bits1(&gb);
00329 sconf->chan_sort = get_bits1(&gb);
00330 sconf->crc_enabled = get_bits1(&gb);
00331 sconf->rlslms = get_bits1(&gb);
00332 skip_bits(&gb, 5);
00333 skip_bits1(&gb);
00334
00335
00336
00337 if (als_id != MKBETAG('A','L','S','\0'))
00338 return -1;
00339
00340 ctx->cur_frame_length = sconf->frame_length;
00341
00342
00343 if (sconf->chan_config)
00344 sconf->chan_config_info = get_bits(&gb, 16);
00345
00346
00347
00348
00349 if (sconf->chan_sort && avctx->channels > 1) {
00350 int chan_pos_bits = av_ceil_log2(avctx->channels);
00351 int bits_needed = avctx->channels * chan_pos_bits + 7;
00352 if (get_bits_left(&gb) < bits_needed)
00353 return -1;
00354
00355 if (!(sconf->chan_pos = av_malloc(avctx->channels * sizeof(*sconf->chan_pos))))
00356 return AVERROR(ENOMEM);
00357
00358 for (i = 0; i < avctx->channels; i++)
00359 sconf->chan_pos[i] = get_bits(&gb, chan_pos_bits);
00360
00361 align_get_bits(&gb);
00362
00363 } else {
00364 sconf->chan_sort = 0;
00365 }
00366
00367
00368
00369
00370 if (get_bits_left(&gb) < 64)
00371 return -1;
00372
00373 header_size = get_bits_long(&gb, 32);
00374 trailer_size = get_bits_long(&gb, 32);
00375 if (header_size == 0xFFFFFFFF)
00376 header_size = 0;
00377 if (trailer_size == 0xFFFFFFFF)
00378 trailer_size = 0;
00379
00380 ht_size = ((int64_t)(header_size) + (int64_t)(trailer_size)) << 3;
00381
00382
00383
00384 if (get_bits_left(&gb) < ht_size)
00385 return -1;
00386
00387 if (ht_size > INT32_MAX)
00388 return -1;
00389
00390 skip_bits_long(&gb, ht_size);
00391
00392
00393
00394 if (sconf->crc_enabled) {
00395 if (get_bits_left(&gb) < 32)
00396 return -1;
00397
00398 if (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL)) {
00399 ctx->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
00400 ctx->crc = 0xFFFFFFFF;
00401 ctx->crc_org = ~get_bits_long(&gb, 32);
00402 } else
00403 skip_bits_long(&gb, 32);
00404 }
00405
00406
00407
00408
00409 dprint_specific_config(ctx);
00410
00411 return 0;
00412 }
00413
00414
00417 static int check_specific_config(ALSDecContext *ctx)
00418 {
00419 ALSSpecificConfig *sconf = &ctx->sconf;
00420 int error = 0;
00421
00422
00423 #define MISSING_ERR(cond, str, errval) \
00424 { \
00425 if (cond) { \
00426 av_log_missing_feature(ctx->avctx, str, 0); \
00427 error = errval; \
00428 } \
00429 }
00430
00431 MISSING_ERR(sconf->floating, "Floating point decoding", AVERROR_PATCHWELCOME);
00432 MISSING_ERR(sconf->rlslms, "Adaptive RLS-LMS prediction", AVERROR_PATCHWELCOME);
00433 MISSING_ERR(sconf->chan_sort, "Channel sorting", 0);
00434
00435 return error;
00436 }
00437
00438
00442 static void parse_bs_info(const uint32_t bs_info, unsigned int n,
00443 unsigned int div, unsigned int **div_blocks,
00444 unsigned int *num_blocks)
00445 {
00446 if (n < 31 && ((bs_info << n) & 0x40000000)) {
00447
00448
00449 n *= 2;
00450 div += 1;
00451 parse_bs_info(bs_info, n + 1, div, div_blocks, num_blocks);
00452 parse_bs_info(bs_info, n + 2, div, div_blocks, num_blocks);
00453 } else {
00454
00455
00456 **div_blocks = div;
00457 (*div_blocks)++;
00458 (*num_blocks)++;
00459 }
00460 }
00461
00462
00465 static int32_t decode_rice(GetBitContext *gb, unsigned int k)
00466 {
00467 int max = get_bits_left(gb) - k;
00468 int q = get_unary(gb, 0, max);
00469 int r = k ? get_bits1(gb) : !(q & 1);
00470
00471 if (k > 1) {
00472 q <<= (k - 1);
00473 q += get_bits_long(gb, k - 1);
00474 } else if (!k) {
00475 q >>= 1;
00476 }
00477 return r ? q : ~q;
00478 }
00479
00480
00483 static void parcor_to_lpc(unsigned int k, const int32_t *par, int32_t *cof)
00484 {
00485 int i, j;
00486
00487 for (i = 0, j = k - 1; i < j; i++, j--) {
00488 int tmp1 = ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
00489 cof[j] += ((MUL64(par[k], cof[i]) + (1 << 19)) >> 20);
00490 cof[i] += tmp1;
00491 }
00492 if (i == j)
00493 cof[i] += ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
00494
00495 cof[k] = par[k];
00496 }
00497
00498
00503 static void get_block_sizes(ALSDecContext *ctx, unsigned int *div_blocks,
00504 uint32_t *bs_info)
00505 {
00506 ALSSpecificConfig *sconf = &ctx->sconf;
00507 GetBitContext *gb = &ctx->gb;
00508 unsigned int *ptr_div_blocks = div_blocks;
00509 unsigned int b;
00510
00511 if (sconf->block_switching) {
00512 unsigned int bs_info_len = 1 << (sconf->block_switching + 2);
00513 *bs_info = get_bits_long(gb, bs_info_len);
00514 *bs_info <<= (32 - bs_info_len);
00515 }
00516
00517 ctx->num_blocks = 0;
00518 parse_bs_info(*bs_info, 0, 0, &ptr_div_blocks, &ctx->num_blocks);
00519
00520
00521
00522
00523
00524
00525
00526
00527
00528
00529
00530
00531
00532
00533
00534
00535 for (b = 0; b < ctx->num_blocks; b++)
00536 div_blocks[b] = ctx->sconf.frame_length >> div_blocks[b];
00537
00538 if (ctx->cur_frame_length != ctx->sconf.frame_length) {
00539 unsigned int remaining = ctx->cur_frame_length;
00540
00541 for (b = 0; b < ctx->num_blocks; b++) {
00542 if (remaining <= div_blocks[b]) {
00543 div_blocks[b] = remaining;
00544 ctx->num_blocks = b + 1;
00545 break;
00546 }
00547
00548 remaining -= div_blocks[b];
00549 }
00550 }
00551 }
00552
00553
00556 static int read_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
00557 {
00558 ALSSpecificConfig *sconf = &ctx->sconf;
00559 AVCodecContext *avctx = ctx->avctx;
00560 GetBitContext *gb = &ctx->gb;
00561
00562 if (bd->block_length <= 0)
00563 return AVERROR_INVALIDDATA;
00564
00565 *bd->raw_samples = 0;
00566 *bd->const_block = get_bits1(gb);
00567 bd->js_blocks = get_bits1(gb);
00568
00569
00570 skip_bits(gb, 5);
00571
00572 if (*bd->const_block) {
00573 unsigned int const_val_bits = sconf->floating ? 24 : avctx->bits_per_raw_sample;
00574 *bd->raw_samples = get_sbits_long(gb, const_val_bits);
00575 }
00576
00577
00578 *bd->const_block = 1;
00579
00580 return 0;
00581 }
00582
00583
00586 static void decode_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
00587 {
00588 int smp = bd->block_length - 1;
00589 int32_t val = *bd->raw_samples;
00590 int32_t *dst = bd->raw_samples + 1;
00591
00592
00593 for (; smp; smp--)
00594 *dst++ = val;
00595 }
00596
00597
00600 static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
00601 {
00602 ALSSpecificConfig *sconf = &ctx->sconf;
00603 AVCodecContext *avctx = ctx->avctx;
00604 GetBitContext *gb = &ctx->gb;
00605 unsigned int k;
00606 unsigned int s[8];
00607 unsigned int sx[8];
00608 unsigned int sub_blocks, log2_sub_blocks, sb_length;
00609 unsigned int start = 0;
00610 unsigned int opt_order;
00611 int sb;
00612 int32_t *quant_cof = bd->quant_cof;
00613 int32_t *current_res;
00614
00615
00616
00617 *bd->const_block = 0;
00618
00619 *bd->opt_order = 1;
00620 bd->js_blocks = get_bits1(gb);
00621
00622 opt_order = *bd->opt_order;
00623
00624
00625 if (!sconf->bgmc && !sconf->sb_part) {
00626 log2_sub_blocks = 0;
00627 } else {
00628 if (sconf->bgmc && sconf->sb_part)
00629 log2_sub_blocks = get_bits(gb, 2);
00630 else
00631 log2_sub_blocks = 2 * get_bits1(gb);
00632 }
00633
00634 sub_blocks = 1 << log2_sub_blocks;
00635
00636
00637
00638 if (bd->block_length & (sub_blocks - 1)) {
00639 av_log(avctx, AV_LOG_WARNING,
00640 "Block length is not evenly divisible by the number of subblocks.\n");
00641 return -1;
00642 }
00643
00644 sb_length = bd->block_length >> log2_sub_blocks;
00645
00646 if (sconf->bgmc) {
00647 s[0] = get_bits(gb, 8 + (sconf->resolution > 1));
00648 for (k = 1; k < sub_blocks; k++)
00649 s[k] = s[k - 1] + decode_rice(gb, 2);
00650
00651 for (k = 0; k < sub_blocks; k++) {
00652 sx[k] = s[k] & 0x0F;
00653 s [k] >>= 4;
00654 }
00655 } else {
00656 s[0] = get_bits(gb, 4 + (sconf->resolution > 1));
00657 for (k = 1; k < sub_blocks; k++)
00658 s[k] = s[k - 1] + decode_rice(gb, 0);
00659 }
00660 for (k = 1; k < sub_blocks; k++)
00661 if (s[k] > 32) {
00662 av_log(avctx, AV_LOG_ERROR, "k invalid for rice code.\n");
00663 return AVERROR_INVALIDDATA;
00664 }
00665
00666 if (get_bits1(gb))
00667 *bd->shift_lsbs = get_bits(gb, 4) + 1;
00668
00669 *bd->store_prev_samples = (bd->js_blocks && bd->raw_other) || *bd->shift_lsbs;
00670
00671
00672 if (!sconf->rlslms) {
00673 if (sconf->adapt_order) {
00674 int opt_order_length = av_ceil_log2(av_clip((bd->block_length >> 3) - 1,
00675 2, sconf->max_order + 1));
00676 *bd->opt_order = get_bits(gb, opt_order_length);
00677 if (*bd->opt_order > sconf->max_order) {
00678 *bd->opt_order = sconf->max_order;
00679 av_log(avctx, AV_LOG_ERROR, "Predictor order too large!\n");
00680 return AVERROR_INVALIDDATA;
00681 }
00682 } else {
00683 *bd->opt_order = sconf->max_order;
00684 }
00685
00686 opt_order = *bd->opt_order;
00687
00688 if (opt_order) {
00689 int add_base;
00690
00691 if (sconf->coef_table == 3) {
00692 add_base = 0x7F;
00693
00694
00695 quant_cof[0] = 32 * parcor_scaled_values[get_bits(gb, 7)];
00696
00697
00698 if (opt_order > 1)
00699 quant_cof[1] = -32 * parcor_scaled_values[get_bits(gb, 7)];
00700
00701
00702 for (k = 2; k < opt_order; k++)
00703 quant_cof[k] = get_bits(gb, 7);
00704 } else {
00705 int k_max;
00706 add_base = 1;
00707
00708
00709 k_max = FFMIN(opt_order, 20);
00710 for (k = 0; k < k_max; k++) {
00711 int rice_param = parcor_rice_table[sconf->coef_table][k][1];
00712 int offset = parcor_rice_table[sconf->coef_table][k][0];
00713 quant_cof[k] = decode_rice(gb, rice_param) + offset;
00714 if (quant_cof[k] < -64 || quant_cof[k] > 63) {
00715 av_log(avctx, AV_LOG_ERROR, "quant_cof %d is out of range\n", quant_cof[k]);
00716 return AVERROR_INVALIDDATA;
00717 }
00718 }
00719
00720
00721 k_max = FFMIN(opt_order, 127);
00722 for (; k < k_max; k++)
00723 quant_cof[k] = decode_rice(gb, 2) + (k & 1);
00724
00725
00726 for (; k < opt_order; k++)
00727 quant_cof[k] = decode_rice(gb, 1);
00728
00729 quant_cof[0] = 32 * parcor_scaled_values[quant_cof[0] + 64];
00730
00731 if (opt_order > 1)
00732 quant_cof[1] = -32 * parcor_scaled_values[quant_cof[1] + 64];
00733 }
00734
00735 for (k = 2; k < opt_order; k++)
00736 quant_cof[k] = (quant_cof[k] << 14) + (add_base << 13);
00737 }
00738 }
00739
00740
00741 if (sconf->long_term_prediction) {
00742 *bd->use_ltp = get_bits1(gb);
00743
00744 if (*bd->use_ltp) {
00745 int r, c;
00746
00747 bd->ltp_gain[0] = decode_rice(gb, 1) << 3;
00748 bd->ltp_gain[1] = decode_rice(gb, 2) << 3;
00749
00750 r = get_unary(gb, 0, 3);
00751 c = get_bits(gb, 2);
00752 bd->ltp_gain[2] = ltp_gain_values[r][c];
00753
00754 bd->ltp_gain[3] = decode_rice(gb, 2) << 3;
00755 bd->ltp_gain[4] = decode_rice(gb, 1) << 3;
00756
00757 *bd->ltp_lag = get_bits(gb, ctx->ltp_lag_length);
00758 *bd->ltp_lag += FFMAX(4, opt_order + 1);
00759 }
00760 }
00761
00762
00763 if (bd->ra_block) {
00764 if (opt_order)
00765 bd->raw_samples[0] = decode_rice(gb, avctx->bits_per_raw_sample - 4);
00766 if (opt_order > 1)
00767 bd->raw_samples[1] = decode_rice(gb, FFMIN(s[0] + 3, ctx->s_max));
00768 if (opt_order > 2)
00769 bd->raw_samples[2] = decode_rice(gb, FFMIN(s[0] + 1, ctx->s_max));
00770
00771 start = FFMIN(opt_order, 3);
00772 }
00773
00774
00775 if (sconf->bgmc) {
00776 int delta[8];
00777 unsigned int k [8];
00778 unsigned int b = av_clip((av_ceil_log2(bd->block_length) - 3) >> 1, 0, 5);
00779
00780
00781 unsigned int high;
00782 unsigned int low;
00783 unsigned int value;
00784
00785 ff_bgmc_decode_init(gb, &high, &low, &value);
00786
00787 current_res = bd->raw_samples + start;
00788
00789 for (sb = 0; sb < sub_blocks; sb++) {
00790 unsigned int sb_len = sb_length - (sb ? 0 : start);
00791
00792 k [sb] = s[sb] > b ? s[sb] - b : 0;
00793 delta[sb] = 5 - s[sb] + k[sb];
00794
00795 ff_bgmc_decode(gb, sb_len, current_res,
00796 delta[sb], sx[sb], &high, &low, &value, ctx->bgmc_lut, ctx->bgmc_lut_status);
00797
00798 current_res += sb_len;
00799 }
00800
00801 ff_bgmc_decode_end(gb);
00802
00803
00804
00805 current_res = bd->raw_samples + start;
00806
00807 for (sb = 0; sb < sub_blocks; sb++, start = 0) {
00808 unsigned int cur_tail_code = tail_code[sx[sb]][delta[sb]];
00809 unsigned int cur_k = k[sb];
00810 unsigned int cur_s = s[sb];
00811
00812 for (; start < sb_length; start++) {
00813 int32_t res = *current_res;
00814
00815 if (res == cur_tail_code) {
00816 unsigned int max_msb = (2 + (sx[sb] > 2) + (sx[sb] > 10))
00817 << (5 - delta[sb]);
00818
00819 res = decode_rice(gb, cur_s);
00820
00821 if (res >= 0) {
00822 res += (max_msb ) << cur_k;
00823 } else {
00824 res -= (max_msb - 1) << cur_k;
00825 }
00826 } else {
00827 if (res > cur_tail_code)
00828 res--;
00829
00830 if (res & 1)
00831 res = -res;
00832
00833 res >>= 1;
00834
00835 if (cur_k) {
00836 res <<= cur_k;
00837 res |= get_bits_long(gb, cur_k);
00838 }
00839 }
00840
00841 *current_res++ = res;
00842 }
00843 }
00844 } else {
00845 current_res = bd->raw_samples + start;
00846
00847 for (sb = 0; sb < sub_blocks; sb++, start = 0)
00848 for (; start < sb_length; start++)
00849 *current_res++ = decode_rice(gb, s[sb]);
00850 }
00851
00852 if (!sconf->mc_coding || ctx->js_switch)
00853 align_get_bits(gb);
00854
00855 return 0;
00856 }
00857
00858
00861 static int decode_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
00862 {
00863 ALSSpecificConfig *sconf = &ctx->sconf;
00864 unsigned int block_length = bd->block_length;
00865 unsigned int smp = 0;
00866 unsigned int k;
00867 int opt_order = *bd->opt_order;
00868 int sb;
00869 int64_t y;
00870 int32_t *quant_cof = bd->quant_cof;
00871 int32_t *lpc_cof = bd->lpc_cof;
00872 int32_t *raw_samples = bd->raw_samples;
00873 int32_t *raw_samples_end = bd->raw_samples + bd->block_length;
00874 int32_t *lpc_cof_reversed = ctx->lpc_cof_reversed_buffer;
00875
00876
00877 if (*bd->use_ltp) {
00878 int ltp_smp;
00879
00880 for (ltp_smp = FFMAX(*bd->ltp_lag - 2, 0); ltp_smp < block_length; ltp_smp++) {
00881 int center = ltp_smp - *bd->ltp_lag;
00882 int begin = FFMAX(0, center - 2);
00883 int end = center + 3;
00884 int tab = 5 - (end - begin);
00885 int base;
00886
00887 y = 1 << 6;
00888
00889 for (base = begin; base < end; base++, tab++)
00890 y += MUL64(bd->ltp_gain[tab], raw_samples[base]);
00891
00892 raw_samples[ltp_smp] += y >> 7;
00893 }
00894 }
00895
00896
00897 if (bd->ra_block) {
00898 for (smp = 0; smp < opt_order; smp++) {
00899 y = 1 << 19;
00900
00901 for (sb = 0; sb < smp; sb++)
00902 y += MUL64(lpc_cof[sb], raw_samples[-(sb + 1)]);
00903
00904 *raw_samples++ -= y >> 20;
00905 parcor_to_lpc(smp, quant_cof, lpc_cof);
00906 }
00907 } else {
00908 for (k = 0; k < opt_order; k++)
00909 parcor_to_lpc(k, quant_cof, lpc_cof);
00910
00911
00912 if (*bd->store_prev_samples)
00913 memcpy(bd->prev_raw_samples, raw_samples - sconf->max_order,
00914 sizeof(*bd->prev_raw_samples) * sconf->max_order);
00915
00916
00917 if (bd->js_blocks && bd->raw_other) {
00918 int32_t *left, *right;
00919
00920 if (bd->raw_other > raw_samples) {
00921 left = raw_samples;
00922 right = bd->raw_other;
00923 } else {
00924 left = bd->raw_other;
00925 right = raw_samples;
00926 }
00927
00928 for (sb = -1; sb >= -sconf->max_order; sb--)
00929 raw_samples[sb] = right[sb] - left[sb];
00930 }
00931
00932
00933 if (*bd->shift_lsbs)
00934 for (sb = -1; sb >= -sconf->max_order; sb--)
00935 raw_samples[sb] >>= *bd->shift_lsbs;
00936 }
00937
00938
00939 lpc_cof = lpc_cof + opt_order;
00940
00941 for (sb = 0; sb < opt_order; sb++)
00942 lpc_cof_reversed[sb] = lpc_cof[-(sb + 1)];
00943
00944
00945 raw_samples = bd->raw_samples + smp;
00946 lpc_cof = lpc_cof_reversed + opt_order;
00947
00948 for (; raw_samples < raw_samples_end; raw_samples++) {
00949 y = 1 << 19;
00950
00951 for (sb = -opt_order; sb < 0; sb++)
00952 y += MUL64(lpc_cof[sb], raw_samples[sb]);
00953
00954 *raw_samples -= y >> 20;
00955 }
00956
00957 raw_samples = bd->raw_samples;
00958
00959
00960 if (*bd->store_prev_samples)
00961 memcpy(raw_samples - sconf->max_order, bd->prev_raw_samples,
00962 sizeof(*raw_samples) * sconf->max_order);
00963
00964 return 0;
00965 }
00966
00967
00970 static int read_block(ALSDecContext *ctx, ALSBlockData *bd)
00971 {
00972 GetBitContext *gb = &ctx->gb;
00973 int ret;
00974
00975 *bd->shift_lsbs = 0;
00976
00977 if (get_bits1(gb)) {
00978 if ((ret = read_var_block_data(ctx, bd)) < 0)
00979 return ret;
00980 } else {
00981 if ((ret = read_const_block_data(ctx, bd)) < 0)
00982 return ret;
00983 }
00984
00985 return 0;
00986 }
00987
00988
00991 static int decode_block(ALSDecContext *ctx, ALSBlockData *bd)
00992 {
00993 unsigned int smp;
00994
00995
00996 if (*bd->const_block)
00997 decode_const_block_data(ctx, bd);
00998 else if (decode_var_block_data(ctx, bd))
00999 return -1;
01000
01001
01002
01003 if (*bd->shift_lsbs)
01004 for (smp = 0; smp < bd->block_length; smp++)
01005 bd->raw_samples[smp] <<= *bd->shift_lsbs;
01006
01007 return 0;
01008 }
01009
01010
01013 static int read_decode_block(ALSDecContext *ctx, ALSBlockData *bd)
01014 {
01015 int ret;
01016
01017 ret = read_block(ctx, bd);
01018
01019 if (ret)
01020 return ret;
01021
01022 ret = decode_block(ctx, bd);
01023
01024 return ret;
01025 }
01026
01027
01031 static void zero_remaining(unsigned int b, unsigned int b_max,
01032 const unsigned int *div_blocks, int32_t *buf)
01033 {
01034 unsigned int count = 0;
01035
01036 while (b < b_max)
01037 count += div_blocks[b++];
01038
01039 if (count)
01040 memset(buf, 0, sizeof(*buf) * count);
01041 }
01042
01043
01046 static int decode_blocks_ind(ALSDecContext *ctx, unsigned int ra_frame,
01047 unsigned int c, const unsigned int *div_blocks,
01048 unsigned int *js_blocks)
01049 {
01050 unsigned int b;
01051 ALSBlockData bd = { 0 };
01052
01053 bd.ra_block = ra_frame;
01054 bd.const_block = ctx->const_block;
01055 bd.shift_lsbs = ctx->shift_lsbs;
01056 bd.opt_order = ctx->opt_order;
01057 bd.store_prev_samples = ctx->store_prev_samples;
01058 bd.use_ltp = ctx->use_ltp;
01059 bd.ltp_lag = ctx->ltp_lag;
01060 bd.ltp_gain = ctx->ltp_gain[0];
01061 bd.quant_cof = ctx->quant_cof[0];
01062 bd.lpc_cof = ctx->lpc_cof[0];
01063 bd.prev_raw_samples = ctx->prev_raw_samples;
01064 bd.raw_samples = ctx->raw_samples[c];
01065
01066
01067 for (b = 0; b < ctx->num_blocks; b++) {
01068 bd.block_length = div_blocks[b];
01069
01070 if (read_decode_block(ctx, &bd)) {
01071
01072 zero_remaining(b, ctx->num_blocks, div_blocks, bd.raw_samples);
01073 return -1;
01074 }
01075 bd.raw_samples += div_blocks[b];
01076 bd.ra_block = 0;
01077 }
01078
01079 return 0;
01080 }
01081
01082
01085 static int decode_blocks(ALSDecContext *ctx, unsigned int ra_frame,
01086 unsigned int c, const unsigned int *div_blocks,
01087 unsigned int *js_blocks)
01088 {
01089 ALSSpecificConfig *sconf = &ctx->sconf;
01090 unsigned int offset = 0;
01091 unsigned int b;
01092 ALSBlockData bd[2] = { { 0 } };
01093
01094 bd[0].ra_block = ra_frame;
01095 bd[0].const_block = ctx->const_block;
01096 bd[0].shift_lsbs = ctx->shift_lsbs;
01097 bd[0].opt_order = ctx->opt_order;
01098 bd[0].store_prev_samples = ctx->store_prev_samples;
01099 bd[0].use_ltp = ctx->use_ltp;
01100 bd[0].ltp_lag = ctx->ltp_lag;
01101 bd[0].ltp_gain = ctx->ltp_gain[0];
01102 bd[0].quant_cof = ctx->quant_cof[0];
01103 bd[0].lpc_cof = ctx->lpc_cof[0];
01104 bd[0].prev_raw_samples = ctx->prev_raw_samples;
01105 bd[0].js_blocks = *js_blocks;
01106
01107 bd[1].ra_block = ra_frame;
01108 bd[1].const_block = ctx->const_block;
01109 bd[1].shift_lsbs = ctx->shift_lsbs;
01110 bd[1].opt_order = ctx->opt_order;
01111 bd[1].store_prev_samples = ctx->store_prev_samples;
01112 bd[1].use_ltp = ctx->use_ltp;
01113 bd[1].ltp_lag = ctx->ltp_lag;
01114 bd[1].ltp_gain = ctx->ltp_gain[0];
01115 bd[1].quant_cof = ctx->quant_cof[0];
01116 bd[1].lpc_cof = ctx->lpc_cof[0];
01117 bd[1].prev_raw_samples = ctx->prev_raw_samples;
01118 bd[1].js_blocks = *(js_blocks + 1);
01119
01120
01121 for (b = 0; b < ctx->num_blocks; b++) {
01122 unsigned int s;
01123
01124 bd[0].block_length = div_blocks[b];
01125 bd[1].block_length = div_blocks[b];
01126
01127 bd[0].raw_samples = ctx->raw_samples[c ] + offset;
01128 bd[1].raw_samples = ctx->raw_samples[c + 1] + offset;
01129
01130 bd[0].raw_other = bd[1].raw_samples;
01131 bd[1].raw_other = bd[0].raw_samples;
01132
01133 if(read_decode_block(ctx, &bd[0]) || read_decode_block(ctx, &bd[1])) {
01134
01135 zero_remaining(b, ctx->num_blocks, div_blocks, bd[0].raw_samples);
01136 zero_remaining(b, ctx->num_blocks, div_blocks, bd[1].raw_samples);
01137 return -1;
01138 }
01139
01140
01141 if (bd[0].js_blocks) {
01142 if (bd[1].js_blocks)
01143 av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel pair.\n");
01144
01145 for (s = 0; s < div_blocks[b]; s++)
01146 bd[0].raw_samples[s] = bd[1].raw_samples[s] - bd[0].raw_samples[s];
01147 } else if (bd[1].js_blocks) {
01148 for (s = 0; s < div_blocks[b]; s++)
01149 bd[1].raw_samples[s] = bd[1].raw_samples[s] + bd[0].raw_samples[s];
01150 }
01151
01152 offset += div_blocks[b];
01153 bd[0].ra_block = 0;
01154 bd[1].ra_block = 0;
01155 }
01156
01157
01158
01159 memmove(ctx->raw_samples[c] - sconf->max_order,
01160 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
01161 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
01162
01163 return 0;
01164 }
01165
01166
01169 static int read_channel_data(ALSDecContext *ctx, ALSChannelData *cd, int c)
01170 {
01171 GetBitContext *gb = &ctx->gb;
01172 ALSChannelData *current = cd;
01173 unsigned int channels = ctx->avctx->channels;
01174 int entries = 0;
01175
01176 while (entries < channels && !(current->stop_flag = get_bits1(gb))) {
01177 current->master_channel = get_bits_long(gb, av_ceil_log2(channels));
01178
01179 if (current->master_channel >= channels) {
01180 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid master channel!\n");
01181 return -1;
01182 }
01183
01184 if (current->master_channel != c) {
01185 current->time_diff_flag = get_bits1(gb);
01186 current->weighting[0] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 31)];
01187 current->weighting[1] = mcc_weightings[av_clip(decode_rice(gb, 2) + 14, 0, 31)];
01188 current->weighting[2] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 31)];
01189
01190 if (current->time_diff_flag) {
01191 current->weighting[3] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 31)];
01192 current->weighting[4] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 31)];
01193 current->weighting[5] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 31)];
01194
01195 current->time_diff_sign = get_bits1(gb);
01196 current->time_diff_index = get_bits(gb, ctx->ltp_lag_length - 3) + 3;
01197 }
01198 }
01199
01200 current++;
01201 entries++;
01202 }
01203
01204 if (entries == channels) {
01205 av_log(ctx->avctx, AV_LOG_ERROR, "Damaged channel data!\n");
01206 return -1;
01207 }
01208
01209 align_get_bits(gb);
01210 return 0;
01211 }
01212
01213
01216 static int revert_channel_correlation(ALSDecContext *ctx, ALSBlockData *bd,
01217 ALSChannelData **cd, int *reverted,
01218 unsigned int offset, int c)
01219 {
01220 ALSChannelData *ch = cd[c];
01221 unsigned int dep = 0;
01222 unsigned int channels = ctx->avctx->channels;
01223
01224 if (reverted[c])
01225 return 0;
01226
01227 reverted[c] = 1;
01228
01229 while (dep < channels && !ch[dep].stop_flag) {
01230 revert_channel_correlation(ctx, bd, cd, reverted, offset,
01231 ch[dep].master_channel);
01232
01233 dep++;
01234 }
01235
01236 if (dep == channels) {
01237 av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel correlation.\n");
01238 return -1;
01239 }
01240
01241 bd->const_block = ctx->const_block + c;
01242 bd->shift_lsbs = ctx->shift_lsbs + c;
01243 bd->opt_order = ctx->opt_order + c;
01244 bd->store_prev_samples = ctx->store_prev_samples + c;
01245 bd->use_ltp = ctx->use_ltp + c;
01246 bd->ltp_lag = ctx->ltp_lag + c;
01247 bd->ltp_gain = ctx->ltp_gain[c];
01248 bd->lpc_cof = ctx->lpc_cof[c];
01249 bd->quant_cof = ctx->quant_cof[c];
01250 bd->raw_samples = ctx->raw_samples[c] + offset;
01251
01252 dep = 0;
01253 while (!ch[dep].stop_flag) {
01254 unsigned int smp;
01255 unsigned int begin = 1;
01256 unsigned int end = bd->block_length - 1;
01257 int64_t y;
01258 int32_t *master = ctx->raw_samples[ch[dep].master_channel] + offset;
01259
01260 if (ch[dep].time_diff_flag) {
01261 int t = ch[dep].time_diff_index;
01262
01263 if (ch[dep].time_diff_sign) {
01264 t = -t;
01265 begin -= t;
01266 } else {
01267 end -= t;
01268 }
01269
01270 for (smp = begin; smp < end; smp++) {
01271 y = (1 << 6) +
01272 MUL64(ch[dep].weighting[0], master[smp - 1 ]) +
01273 MUL64(ch[dep].weighting[1], master[smp ]) +
01274 MUL64(ch[dep].weighting[2], master[smp + 1 ]) +
01275 MUL64(ch[dep].weighting[3], master[smp - 1 + t]) +
01276 MUL64(ch[dep].weighting[4], master[smp + t]) +
01277 MUL64(ch[dep].weighting[5], master[smp + 1 + t]);
01278
01279 bd->raw_samples[smp] += y >> 7;
01280 }
01281 } else {
01282 for (smp = begin; smp < end; smp++) {
01283 y = (1 << 6) +
01284 MUL64(ch[dep].weighting[0], master[smp - 1]) +
01285 MUL64(ch[dep].weighting[1], master[smp ]) +
01286 MUL64(ch[dep].weighting[2], master[smp + 1]);
01287
01288 bd->raw_samples[smp] += y >> 7;
01289 }
01290 }
01291
01292 dep++;
01293 }
01294
01295 return 0;
01296 }
01297
01298
01301 static int read_frame_data(ALSDecContext *ctx, unsigned int ra_frame)
01302 {
01303 ALSSpecificConfig *sconf = &ctx->sconf;
01304 AVCodecContext *avctx = ctx->avctx;
01305 GetBitContext *gb = &ctx->gb;
01306 unsigned int div_blocks[32];
01307 unsigned int c;
01308 unsigned int js_blocks[2];
01309
01310 uint32_t bs_info = 0;
01311
01312
01313 if (sconf->ra_flag == RA_FLAG_FRAMES && ra_frame)
01314 skip_bits_long(gb, 32);
01315
01316 if (sconf->mc_coding && sconf->joint_stereo) {
01317 ctx->js_switch = get_bits1(gb);
01318 align_get_bits(gb);
01319 }
01320
01321 if (!sconf->mc_coding || ctx->js_switch) {
01322 int independent_bs = !sconf->joint_stereo;
01323
01324 for (c = 0; c < avctx->channels; c++) {
01325 js_blocks[0] = 0;
01326 js_blocks[1] = 0;
01327
01328 get_block_sizes(ctx, div_blocks, &bs_info);
01329
01330
01331
01332 if (sconf->joint_stereo && sconf->block_switching)
01333 if (bs_info >> 31)
01334 independent_bs = 2;
01335
01336
01337 if (c == avctx->channels - 1)
01338 independent_bs = 1;
01339
01340 if (independent_bs) {
01341 if (decode_blocks_ind(ctx, ra_frame, c, div_blocks, js_blocks))
01342 return -1;
01343
01344 independent_bs--;
01345 } else {
01346 if (decode_blocks(ctx, ra_frame, c, div_blocks, js_blocks))
01347 return -1;
01348
01349 c++;
01350 }
01351
01352
01353 memmove(ctx->raw_samples[c] - sconf->max_order,
01354 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
01355 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
01356 }
01357 } else {
01358 ALSBlockData bd = { 0 };
01359 int b, ret;
01360 int *reverted_channels = ctx->reverted_channels;
01361 unsigned int offset = 0;
01362
01363 for (c = 0; c < avctx->channels; c++)
01364 if (ctx->chan_data[c] < ctx->chan_data_buffer) {
01365 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid channel data!\n");
01366 return -1;
01367 }
01368
01369 memset(reverted_channels, 0, sizeof(*reverted_channels) * avctx->channels);
01370
01371 bd.ra_block = ra_frame;
01372 bd.prev_raw_samples = ctx->prev_raw_samples;
01373
01374 get_block_sizes(ctx, div_blocks, &bs_info);
01375
01376 for (b = 0; b < ctx->num_blocks; b++) {
01377 bd.block_length = div_blocks[b];
01378
01379 for (c = 0; c < avctx->channels; c++) {
01380 bd.const_block = ctx->const_block + c;
01381 bd.shift_lsbs = ctx->shift_lsbs + c;
01382 bd.opt_order = ctx->opt_order + c;
01383 bd.store_prev_samples = ctx->store_prev_samples + c;
01384 bd.use_ltp = ctx->use_ltp + c;
01385 bd.ltp_lag = ctx->ltp_lag + c;
01386 bd.ltp_gain = ctx->ltp_gain[c];
01387 bd.lpc_cof = ctx->lpc_cof[c];
01388 bd.quant_cof = ctx->quant_cof[c];
01389 bd.raw_samples = ctx->raw_samples[c] + offset;
01390 bd.raw_other = NULL;
01391
01392 if ((ret = read_block(ctx, &bd)) < 0)
01393 return ret;
01394 if ((ret = read_channel_data(ctx, ctx->chan_data[c], c)) < 0)
01395 return ret;
01396 }
01397
01398 for (c = 0; c < avctx->channels; c++)
01399 if (revert_channel_correlation(ctx, &bd, ctx->chan_data,
01400 reverted_channels, offset, c))
01401 return -1;
01402
01403 for (c = 0; c < avctx->channels; c++) {
01404 bd.const_block = ctx->const_block + c;
01405 bd.shift_lsbs = ctx->shift_lsbs + c;
01406 bd.opt_order = ctx->opt_order + c;
01407 bd.store_prev_samples = ctx->store_prev_samples + c;
01408 bd.use_ltp = ctx->use_ltp + c;
01409 bd.ltp_lag = ctx->ltp_lag + c;
01410 bd.ltp_gain = ctx->ltp_gain[c];
01411 bd.lpc_cof = ctx->lpc_cof[c];
01412 bd.quant_cof = ctx->quant_cof[c];
01413 bd.raw_samples = ctx->raw_samples[c] + offset;
01414
01415 if ((ret = decode_block(ctx, &bd)) < 0)
01416 return ret;
01417 }
01418
01419 memset(reverted_channels, 0, avctx->channels * sizeof(*reverted_channels));
01420 offset += div_blocks[b];
01421 bd.ra_block = 0;
01422 }
01423
01424
01425 for (c = 0; c < avctx->channels; c++)
01426 memmove(ctx->raw_samples[c] - sconf->max_order,
01427 ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
01428 sizeof(*ctx->raw_samples[c]) * sconf->max_order);
01429 }
01430
01431
01432
01433 return 0;
01434 }
01435
01436
01439 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr,
01440 AVPacket *avpkt)
01441 {
01442 ALSDecContext *ctx = avctx->priv_data;
01443 ALSSpecificConfig *sconf = &ctx->sconf;
01444 const uint8_t *buffer = avpkt->data;
01445 int buffer_size = avpkt->size;
01446 int invalid_frame, ret;
01447 unsigned int c, sample, ra_frame, bytes_read, shift;
01448
01449 init_get_bits(&ctx->gb, buffer, buffer_size * 8);
01450
01451
01452
01453
01454
01455 ra_frame = sconf->ra_distance && !(ctx->frame_id % sconf->ra_distance);
01456
01457
01458 if (sconf->samples != 0xFFFFFFFF)
01459 ctx->cur_frame_length = FFMIN(sconf->samples - ctx->frame_id * (uint64_t) sconf->frame_length,
01460 sconf->frame_length);
01461 else
01462 ctx->cur_frame_length = sconf->frame_length;
01463
01464
01465 if ((invalid_frame = read_frame_data(ctx, ra_frame)) < 0)
01466 av_log(ctx->avctx, AV_LOG_WARNING,
01467 "Reading frame data failed. Skipping RA unit.\n");
01468
01469 ctx->frame_id++;
01470
01471
01472 ctx->frame.nb_samples = ctx->cur_frame_length;
01473 if ((ret = ff_get_buffer(avctx, &ctx->frame)) < 0) {
01474 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
01475 return ret;
01476 }
01477
01478
01479 #define INTERLEAVE_OUTPUT(bps) \
01480 { \
01481 int##bps##_t *dest = (int##bps##_t*)ctx->frame.data[0]; \
01482 shift = bps - ctx->avctx->bits_per_raw_sample; \
01483 for (sample = 0; sample < ctx->cur_frame_length; sample++) \
01484 for (c = 0; c < avctx->channels; c++) \
01485 *dest++ = ctx->raw_samples[c][sample] << shift; \
01486 }
01487
01488 if (ctx->avctx->bits_per_raw_sample <= 16) {
01489 INTERLEAVE_OUTPUT(16)
01490 } else {
01491 INTERLEAVE_OUTPUT(32)
01492 }
01493
01494
01495 if (sconf->crc_enabled && (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL))) {
01496 int swap = HAVE_BIGENDIAN != sconf->msb_first;
01497
01498 if (ctx->avctx->bits_per_raw_sample == 24) {
01499 int32_t *src = (int32_t *)ctx->frame.data[0];
01500
01501 for (sample = 0;
01502 sample < ctx->cur_frame_length * avctx->channels;
01503 sample++) {
01504 int32_t v;
01505
01506 if (swap)
01507 v = av_bswap32(src[sample]);
01508 else
01509 v = src[sample];
01510 if (!HAVE_BIGENDIAN)
01511 v >>= 8;
01512
01513 ctx->crc = av_crc(ctx->crc_table, ctx->crc, (uint8_t*)(&v), 3);
01514 }
01515 } else {
01516 uint8_t *crc_source;
01517
01518 if (swap) {
01519 if (ctx->avctx->bits_per_raw_sample <= 16) {
01520 int16_t *src = (int16_t*) ctx->frame.data[0];
01521 int16_t *dest = (int16_t*) ctx->crc_buffer;
01522 for (sample = 0;
01523 sample < ctx->cur_frame_length * avctx->channels;
01524 sample++)
01525 *dest++ = av_bswap16(src[sample]);
01526 } else {
01527 ctx->dsp.bswap_buf((uint32_t*)ctx->crc_buffer,
01528 (uint32_t *)ctx->frame.data[0],
01529 ctx->cur_frame_length * avctx->channels);
01530 }
01531 crc_source = ctx->crc_buffer;
01532 } else {
01533 crc_source = ctx->frame.data[0];
01534 }
01535
01536 ctx->crc = av_crc(ctx->crc_table, ctx->crc, crc_source,
01537 ctx->cur_frame_length * avctx->channels *
01538 av_get_bytes_per_sample(avctx->sample_fmt));
01539 }
01540
01541
01542
01543 if (ctx->cur_frame_length != sconf->frame_length &&
01544 ctx->crc_org != ctx->crc) {
01545 av_log(avctx, AV_LOG_ERROR, "CRC error!\n");
01546 }
01547 }
01548
01549 *got_frame_ptr = 1;
01550 *(AVFrame *)data = ctx->frame;
01551
01552
01553 bytes_read = invalid_frame ? buffer_size :
01554 (get_bits_count(&ctx->gb) + 7) >> 3;
01555
01556 return bytes_read;
01557 }
01558
01559
01562 static av_cold int decode_end(AVCodecContext *avctx)
01563 {
01564 ALSDecContext *ctx = avctx->priv_data;
01565
01566 av_freep(&ctx->sconf.chan_pos);
01567
01568 ff_bgmc_end(&ctx->bgmc_lut, &ctx->bgmc_lut_status);
01569
01570 av_freep(&ctx->const_block);
01571 av_freep(&ctx->shift_lsbs);
01572 av_freep(&ctx->opt_order);
01573 av_freep(&ctx->store_prev_samples);
01574 av_freep(&ctx->use_ltp);
01575 av_freep(&ctx->ltp_lag);
01576 av_freep(&ctx->ltp_gain);
01577 av_freep(&ctx->ltp_gain_buffer);
01578 av_freep(&ctx->quant_cof);
01579 av_freep(&ctx->lpc_cof);
01580 av_freep(&ctx->quant_cof_buffer);
01581 av_freep(&ctx->lpc_cof_buffer);
01582 av_freep(&ctx->lpc_cof_reversed_buffer);
01583 av_freep(&ctx->prev_raw_samples);
01584 av_freep(&ctx->raw_samples);
01585 av_freep(&ctx->raw_buffer);
01586 av_freep(&ctx->chan_data);
01587 av_freep(&ctx->chan_data_buffer);
01588 av_freep(&ctx->reverted_channels);
01589 av_freep(&ctx->crc_buffer);
01590
01591 return 0;
01592 }
01593
01594
01597 static av_cold int decode_init(AVCodecContext *avctx)
01598 {
01599 unsigned int c;
01600 unsigned int channel_size;
01601 int num_buffers;
01602 ALSDecContext *ctx = avctx->priv_data;
01603 ALSSpecificConfig *sconf = &ctx->sconf;
01604 ctx->avctx = avctx;
01605
01606 if (!avctx->extradata) {
01607 av_log(avctx, AV_LOG_ERROR, "Missing required ALS extradata!\n");
01608 return -1;
01609 }
01610
01611 if (read_specific_config(ctx)) {
01612 av_log(avctx, AV_LOG_ERROR, "Reading ALSSpecificConfig failed!\n");
01613 decode_end(avctx);
01614 return -1;
01615 }
01616
01617 if (check_specific_config(ctx)) {
01618 decode_end(avctx);
01619 return -1;
01620 }
01621
01622 if (sconf->bgmc)
01623 ff_bgmc_init(avctx, &ctx->bgmc_lut, &ctx->bgmc_lut_status);
01624
01625 if (sconf->floating) {
01626 avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
01627 avctx->bits_per_raw_sample = 32;
01628 } else {
01629 avctx->sample_fmt = sconf->resolution > 1
01630 ? AV_SAMPLE_FMT_S32 : AV_SAMPLE_FMT_S16;
01631 avctx->bits_per_raw_sample = (sconf->resolution + 1) * 8;
01632 }
01633
01634
01635
01636
01637 ctx->s_max = sconf->resolution > 1 ? 31 : 15;
01638
01639
01640 ctx->ltp_lag_length = 8 + (avctx->sample_rate >= 96000) +
01641 (avctx->sample_rate >= 192000);
01642
01643
01644 num_buffers = sconf->mc_coding ? avctx->channels : 1;
01645
01646 ctx->quant_cof = av_malloc(sizeof(*ctx->quant_cof) * num_buffers);
01647 ctx->lpc_cof = av_malloc(sizeof(*ctx->lpc_cof) * num_buffers);
01648 ctx->quant_cof_buffer = av_malloc(sizeof(*ctx->quant_cof_buffer) *
01649 num_buffers * sconf->max_order);
01650 ctx->lpc_cof_buffer = av_malloc(sizeof(*ctx->lpc_cof_buffer) *
01651 num_buffers * sconf->max_order);
01652 ctx->lpc_cof_reversed_buffer = av_malloc(sizeof(*ctx->lpc_cof_buffer) *
01653 sconf->max_order);
01654
01655 if (!ctx->quant_cof || !ctx->lpc_cof ||
01656 !ctx->quant_cof_buffer || !ctx->lpc_cof_buffer ||
01657 !ctx->lpc_cof_reversed_buffer) {
01658 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed!\n");
01659 return AVERROR(ENOMEM);
01660 }
01661
01662
01663 for (c = 0; c < num_buffers; c++) {
01664 ctx->quant_cof[c] = ctx->quant_cof_buffer + c * sconf->max_order;
01665 ctx->lpc_cof[c] = ctx->lpc_cof_buffer + c * sconf->max_order;
01666 }
01667
01668
01669 ctx->const_block = av_malloc (sizeof(*ctx->const_block) * num_buffers);
01670 ctx->shift_lsbs = av_malloc (sizeof(*ctx->shift_lsbs) * num_buffers);
01671 ctx->opt_order = av_malloc (sizeof(*ctx->opt_order) * num_buffers);
01672 ctx->store_prev_samples = av_malloc(sizeof(*ctx->store_prev_samples) * num_buffers);
01673 ctx->use_ltp = av_mallocz(sizeof(*ctx->use_ltp) * num_buffers);
01674 ctx->ltp_lag = av_malloc (sizeof(*ctx->ltp_lag) * num_buffers);
01675 ctx->ltp_gain = av_malloc (sizeof(*ctx->ltp_gain) * num_buffers);
01676 ctx->ltp_gain_buffer = av_malloc (sizeof(*ctx->ltp_gain_buffer) *
01677 num_buffers * 5);
01678
01679 if (!ctx->const_block || !ctx->shift_lsbs ||
01680 !ctx->opt_order || !ctx->store_prev_samples ||
01681 !ctx->use_ltp || !ctx->ltp_lag ||
01682 !ctx->ltp_gain || !ctx->ltp_gain_buffer) {
01683 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed!\n");
01684 decode_end(avctx);
01685 return AVERROR(ENOMEM);
01686 }
01687
01688 for (c = 0; c < num_buffers; c++)
01689 ctx->ltp_gain[c] = ctx->ltp_gain_buffer + c * 5;
01690
01691
01692 if (sconf->mc_coding) {
01693 ctx->chan_data_buffer = av_malloc(sizeof(*ctx->chan_data_buffer) *
01694 num_buffers * num_buffers);
01695 ctx->chan_data = av_malloc(sizeof(*ctx->chan_data) *
01696 num_buffers);
01697 ctx->reverted_channels = av_malloc(sizeof(*ctx->reverted_channels) *
01698 num_buffers);
01699
01700 if (!ctx->chan_data_buffer || !ctx->chan_data || !ctx->reverted_channels) {
01701 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed!\n");
01702 decode_end(avctx);
01703 return AVERROR(ENOMEM);
01704 }
01705
01706 for (c = 0; c < num_buffers; c++)
01707 ctx->chan_data[c] = ctx->chan_data_buffer + c * num_buffers;
01708 } else {
01709 ctx->chan_data = NULL;
01710 ctx->chan_data_buffer = NULL;
01711 ctx->reverted_channels = NULL;
01712 }
01713
01714 channel_size = sconf->frame_length + sconf->max_order;
01715
01716 ctx->prev_raw_samples = av_malloc (sizeof(*ctx->prev_raw_samples) * sconf->max_order);
01717 ctx->raw_buffer = av_mallocz(sizeof(*ctx-> raw_buffer) * avctx->channels * channel_size);
01718 ctx->raw_samples = av_malloc (sizeof(*ctx-> raw_samples) * avctx->channels);
01719
01720
01721 if (!ctx->prev_raw_samples || !ctx->raw_buffer|| !ctx->raw_samples) {
01722 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed!\n");
01723 decode_end(avctx);
01724 return AVERROR(ENOMEM);
01725 }
01726
01727
01728 ctx->raw_samples[0] = ctx->raw_buffer + sconf->max_order;
01729 for (c = 1; c < avctx->channels; c++)
01730 ctx->raw_samples[c] = ctx->raw_samples[c - 1] + channel_size;
01731
01732
01733 if (HAVE_BIGENDIAN != sconf->msb_first && sconf->crc_enabled &&
01734 (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL))) {
01735 ctx->crc_buffer = av_malloc(sizeof(*ctx->crc_buffer) *
01736 ctx->cur_frame_length *
01737 avctx->channels *
01738 av_get_bytes_per_sample(avctx->sample_fmt));
01739 if (!ctx->crc_buffer) {
01740 av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed!\n");
01741 decode_end(avctx);
01742 return AVERROR(ENOMEM);
01743 }
01744 }
01745
01746 ff_dsputil_init(&ctx->dsp, avctx);
01747
01748 avcodec_get_frame_defaults(&ctx->frame);
01749 avctx->coded_frame = &ctx->frame;
01750
01751 return 0;
01752 }
01753
01754
01757 static av_cold void flush(AVCodecContext *avctx)
01758 {
01759 ALSDecContext *ctx = avctx->priv_data;
01760
01761 ctx->frame_id = 0;
01762 }
01763
01764
01765 AVCodec ff_als_decoder = {
01766 .name = "als",
01767 .type = AVMEDIA_TYPE_AUDIO,
01768 .id = AV_CODEC_ID_MP4ALS,
01769 .priv_data_size = sizeof(ALSDecContext),
01770 .init = decode_init,
01771 .close = decode_end,
01772 .decode = decode_frame,
01773 .flush = flush,
01774 .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1,
01775 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 Audio Lossless Coding (ALS)"),
01776 };