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00022 #include "avcodec.h"
00023 #include "internal.h"
00024 #include "get_bits.h"
00025 #include "dsputil.h"
00026 #include "fft.h"
00027 #include "lsp.h"
00028 #include "sinewin.h"
00029
00030 #include <math.h>
00031 #include <stdint.h>
00032
00033 #include "twinvq_data.h"
00034
00035 enum FrameType {
00036 FT_SHORT = 0,
00037 FT_MEDIUM,
00038 FT_LONG,
00039 FT_PPC,
00040 };
00041
00045 struct FrameMode {
00046 uint8_t sub;
00047 const uint16_t *bark_tab;
00048
00050 uint8_t bark_env_size;
00051
00052 const int16_t *bark_cb;
00053 uint8_t bark_n_coef;
00054 uint8_t bark_n_bit;
00055
00057
00058 const int16_t *cb0;
00059 const int16_t *cb1;
00061
00062 uint8_t cb_len_read;
00063 };
00064
00069 typedef struct {
00070 struct FrameMode fmode[3];
00071
00072 uint16_t size;
00073 uint8_t n_lsp;
00074 const float *lspcodebook;
00075
00076
00077 uint8_t lsp_bit0;
00078 uint8_t lsp_bit1;
00079 uint8_t lsp_bit2;
00080
00081 uint8_t lsp_split;
00082 const int16_t *ppc_shape_cb;
00083
00085 uint8_t ppc_period_bit;
00086
00087 uint8_t ppc_shape_bit;
00088 uint8_t ppc_shape_len;
00089 uint8_t pgain_bit;
00090
00092 uint16_t peak_per2wid;
00093 } ModeTab;
00094
00095 static const ModeTab mode_08_08 = {
00096 {
00097 { 8, bark_tab_s08_64, 10, tab.fcb08s , 1, 5, tab.cb0808s0, tab.cb0808s1, 18},
00098 { 2, bark_tab_m08_256, 20, tab.fcb08m , 2, 5, tab.cb0808m0, tab.cb0808m1, 16},
00099 { 1, bark_tab_l08_512, 30, tab.fcb08l , 3, 6, tab.cb0808l0, tab.cb0808l1, 17}
00100 },
00101 512 , 12, tab.lsp08, 1, 5, 3, 3, tab.shape08 , 8, 28, 20, 6, 40
00102 };
00103
00104 static const ModeTab mode_11_08 = {
00105 {
00106 { 8, bark_tab_s11_64, 10, tab.fcb11s , 1, 5, tab.cb1108s0, tab.cb1108s1, 29},
00107 { 2, bark_tab_m11_256, 20, tab.fcb11m , 2, 5, tab.cb1108m0, tab.cb1108m1, 24},
00108 { 1, bark_tab_l11_512, 30, tab.fcb11l , 3, 6, tab.cb1108l0, tab.cb1108l1, 27}
00109 },
00110 512 , 16, tab.lsp11, 1, 6, 4, 3, tab.shape11 , 9, 36, 30, 7, 90
00111 };
00112
00113 static const ModeTab mode_11_10 = {
00114 {
00115 { 8, bark_tab_s11_64, 10, tab.fcb11s , 1, 5, tab.cb1110s0, tab.cb1110s1, 21},
00116 { 2, bark_tab_m11_256, 20, tab.fcb11m , 2, 5, tab.cb1110m0, tab.cb1110m1, 18},
00117 { 1, bark_tab_l11_512, 30, tab.fcb11l , 3, 6, tab.cb1110l0, tab.cb1110l1, 20}
00118 },
00119 512 , 16, tab.lsp11, 1, 6, 4, 3, tab.shape11 , 9, 36, 30, 7, 90
00120 };
00121
00122 static const ModeTab mode_16_16 = {
00123 {
00124 { 8, bark_tab_s16_128, 10, tab.fcb16s , 1, 5, tab.cb1616s0, tab.cb1616s1, 16},
00125 { 2, bark_tab_m16_512, 20, tab.fcb16m , 2, 5, tab.cb1616m0, tab.cb1616m1, 15},
00126 { 1, bark_tab_l16_1024,30, tab.fcb16l , 3, 6, tab.cb1616l0, tab.cb1616l1, 16}
00127 },
00128 1024, 16, tab.lsp16, 1, 6, 4, 3, tab.shape16 , 9, 56, 60, 7, 180
00129 };
00130
00131 static const ModeTab mode_22_20 = {
00132 {
00133 { 8, bark_tab_s22_128, 10, tab.fcb22s_1, 1, 6, tab.cb2220s0, tab.cb2220s1, 18},
00134 { 2, bark_tab_m22_512, 20, tab.fcb22m_1, 2, 6, tab.cb2220m0, tab.cb2220m1, 17},
00135 { 1, bark_tab_l22_1024,32, tab.fcb22l_1, 4, 6, tab.cb2220l0, tab.cb2220l1, 18}
00136 },
00137 1024, 16, tab.lsp22_1, 1, 6, 4, 3, tab.shape22_1, 9, 56, 36, 7, 144
00138 };
00139
00140 static const ModeTab mode_22_24 = {
00141 {
00142 { 8, bark_tab_s22_128, 10, tab.fcb22s_1, 1, 6, tab.cb2224s0, tab.cb2224s1, 15},
00143 { 2, bark_tab_m22_512, 20, tab.fcb22m_1, 2, 6, tab.cb2224m0, tab.cb2224m1, 14},
00144 { 1, bark_tab_l22_1024,32, tab.fcb22l_1, 4, 6, tab.cb2224l0, tab.cb2224l1, 15}
00145 },
00146 1024, 16, tab.lsp22_1, 1, 6, 4, 3, tab.shape22_1, 9, 56, 36, 7, 144
00147 };
00148
00149 static const ModeTab mode_22_32 = {
00150 {
00151 { 4, bark_tab_s22_128, 10, tab.fcb22s_2, 1, 6, tab.cb2232s0, tab.cb2232s1, 11},
00152 { 2, bark_tab_m22_256, 20, tab.fcb22m_2, 2, 6, tab.cb2232m0, tab.cb2232m1, 11},
00153 { 1, bark_tab_l22_512, 32, tab.fcb22l_2, 4, 6, tab.cb2232l0, tab.cb2232l1, 12}
00154 },
00155 512 , 16, tab.lsp22_2, 1, 6, 4, 4, tab.shape22_2, 9, 56, 36, 7, 72
00156 };
00157
00158 static const ModeTab mode_44_40 = {
00159 {
00160 {16, bark_tab_s44_128, 10, tab.fcb44s , 1, 6, tab.cb4440s0, tab.cb4440s1, 18},
00161 { 4, bark_tab_m44_512, 20, tab.fcb44m , 2, 6, tab.cb4440m0, tab.cb4440m1, 17},
00162 { 1, bark_tab_l44_2048,40, tab.fcb44l , 4, 6, tab.cb4440l0, tab.cb4440l1, 17}
00163 },
00164 2048, 20, tab.lsp44, 1, 6, 4, 4, tab.shape44 , 9, 84, 54, 7, 432
00165 };
00166
00167 static const ModeTab mode_44_48 = {
00168 {
00169 {16, bark_tab_s44_128, 10, tab.fcb44s , 1, 6, tab.cb4448s0, tab.cb4448s1, 15},
00170 { 4, bark_tab_m44_512, 20, tab.fcb44m , 2, 6, tab.cb4448m0, tab.cb4448m1, 14},
00171 { 1, bark_tab_l44_2048,40, tab.fcb44l , 4, 6, tab.cb4448l0, tab.cb4448l1, 14}
00172 },
00173 2048, 20, tab.lsp44, 1, 6, 4, 4, tab.shape44 , 9, 84, 54, 7, 432
00174 };
00175
00176 typedef struct TwinContext {
00177 AVCodecContext *avctx;
00178 AVFrame frame;
00179 DSPContext dsp;
00180 FFTContext mdct_ctx[3];
00181
00182 const ModeTab *mtab;
00183
00184
00185 float lsp_hist[2][20];
00186 float bark_hist[3][2][40];
00187
00188
00189 int16_t permut[4][4096];
00190 uint8_t length[4][2];
00191 uint8_t length_change[4];
00192 uint8_t bits_main_spec[2][4][2];
00193 int bits_main_spec_change[4];
00194 int n_div[4];
00195
00196 float *spectrum;
00197 float *curr_frame;
00198 float *prev_frame;
00199 int last_block_pos[2];
00200 int discarded_packets;
00201
00202 float *cos_tabs[3];
00203
00204
00205 float *tmp_buf;
00206 } TwinContext;
00207
00208 #define PPC_SHAPE_CB_SIZE 64
00209 #define PPC_SHAPE_LEN_MAX 60
00210 #define SUB_AMP_MAX 4500.0
00211 #define MULAW_MU 100.0
00212 #define GAIN_BITS 8
00213 #define AMP_MAX 13000.0
00214 #define SUB_GAIN_BITS 5
00215 #define WINDOW_TYPE_BITS 4
00216 #define PGAIN_MU 200
00217 #define LSP_COEFS_MAX 20
00218 #define LSP_SPLIT_MAX 4
00219 #define CHANNELS_MAX 2
00220 #define SUBBLOCKS_MAX 16
00221 #define BARK_N_COEF_MAX 4
00222
00224 static void memset_float(float *buf, float val, int size)
00225 {
00226 while (size--)
00227 *buf++ = val;
00228 }
00229
00242 static float eval_lpc_spectrum(const float *lsp, float cos_val, int order)
00243 {
00244 int j;
00245 float p = 0.5f;
00246 float q = 0.5f;
00247 float two_cos_w = 2.0f*cos_val;
00248
00249 for (j = 0; j + 1 < order; j += 2*2) {
00250
00251 q *= lsp[j ] - two_cos_w;
00252 p *= lsp[j+1] - two_cos_w;
00253
00254 q *= lsp[j+2] - two_cos_w;
00255 p *= lsp[j+3] - two_cos_w;
00256 }
00257
00258 p *= p * (2.0f - two_cos_w);
00259 q *= q * (2.0f + two_cos_w);
00260
00261 return 0.5 / (p + q);
00262 }
00263
00267 static void eval_lpcenv(TwinContext *tctx, const float *cos_vals, float *lpc)
00268 {
00269 int i;
00270 const ModeTab *mtab = tctx->mtab;
00271 int size_s = mtab->size / mtab->fmode[FT_SHORT].sub;
00272
00273 for (i = 0; i < size_s/2; i++) {
00274 float cos_i = tctx->cos_tabs[0][i];
00275 lpc[i] = eval_lpc_spectrum(cos_vals, cos_i, mtab->n_lsp);
00276 lpc[size_s-i-1] = eval_lpc_spectrum(cos_vals, -cos_i, mtab->n_lsp);
00277 }
00278 }
00279
00280 static void interpolate(float *out, float v1, float v2, int size)
00281 {
00282 int i;
00283 float step = (v1 - v2)/(size + 1);
00284
00285 for (i = 0; i < size; i++) {
00286 v2 += step;
00287 out[i] = v2;
00288 }
00289 }
00290
00291 static inline float get_cos(int idx, int part, const float *cos_tab, int size)
00292 {
00293 return part ? -cos_tab[size - idx - 1] :
00294 cos_tab[ idx ];
00295 }
00296
00311 static inline void eval_lpcenv_or_interp(TwinContext *tctx,
00312 enum FrameType ftype,
00313 float *out, const float *in,
00314 int size, int step, int part)
00315 {
00316 int i;
00317 const ModeTab *mtab = tctx->mtab;
00318 const float *cos_tab = tctx->cos_tabs[ftype];
00319
00320
00321 for (i = 0; i < size; i += step)
00322 out[i] =
00323 eval_lpc_spectrum(in,
00324 get_cos(i, part, cos_tab, size),
00325 mtab->n_lsp);
00326
00327
00328 for (i = step; i <= size - 2*step; i += step) {
00329 if (out[i + step] + out[i - step] > 1.95*out[i] ||
00330 out[i + step] >= out[i - step]) {
00331 interpolate(out + i - step + 1, out[i], out[i-step], step - 1);
00332 } else {
00333 out[i - step/2] =
00334 eval_lpc_spectrum(in,
00335 get_cos(i-step/2, part, cos_tab, size),
00336 mtab->n_lsp);
00337 interpolate(out + i - step + 1, out[i-step/2], out[i-step ], step/2 - 1);
00338 interpolate(out + i - step/2 + 1, out[i ], out[i-step/2], step/2 - 1);
00339 }
00340 }
00341
00342 interpolate(out + size - 2*step + 1, out[size-step], out[size - 2*step], step - 1);
00343 }
00344
00345 static void eval_lpcenv_2parts(TwinContext *tctx, enum FrameType ftype,
00346 const float *buf, float *lpc,
00347 int size, int step)
00348 {
00349 eval_lpcenv_or_interp(tctx, ftype, lpc , buf, size/2, step, 0);
00350 eval_lpcenv_or_interp(tctx, ftype, lpc + size/2, buf, size/2, 2*step, 1);
00351
00352 interpolate(lpc+size/2-step+1, lpc[size/2], lpc[size/2-step], step);
00353
00354 memset_float(lpc + size - 2*step + 1, lpc[size - 2*step], 2*step - 1);
00355 }
00356
00362 static void dequant(TwinContext *tctx, GetBitContext *gb, float *out,
00363 enum FrameType ftype,
00364 const int16_t *cb0, const int16_t *cb1, int cb_len)
00365 {
00366 int pos = 0;
00367 int i, j;
00368
00369 for (i = 0; i < tctx->n_div[ftype]; i++) {
00370 int tmp0, tmp1;
00371 int sign0 = 1;
00372 int sign1 = 1;
00373 const int16_t *tab0, *tab1;
00374 int length = tctx->length[ftype][i >= tctx->length_change[ftype]];
00375 int bitstream_second_part = (i >= tctx->bits_main_spec_change[ftype]);
00376
00377 int bits = tctx->bits_main_spec[0][ftype][bitstream_second_part];
00378 if (bits == 7) {
00379 if (get_bits1(gb))
00380 sign0 = -1;
00381 bits = 6;
00382 }
00383 tmp0 = get_bits(gb, bits);
00384
00385 bits = tctx->bits_main_spec[1][ftype][bitstream_second_part];
00386
00387 if (bits == 7) {
00388 if (get_bits1(gb))
00389 sign1 = -1;
00390
00391 bits = 6;
00392 }
00393 tmp1 = get_bits(gb, bits);
00394
00395 tab0 = cb0 + tmp0*cb_len;
00396 tab1 = cb1 + tmp1*cb_len;
00397
00398 for (j = 0; j < length; j++)
00399 out[tctx->permut[ftype][pos+j]] = sign0*tab0[j] + sign1*tab1[j];
00400
00401 pos += length;
00402 }
00403
00404 }
00405
00406 static inline float mulawinv(float y, float clip, float mu)
00407 {
00408 y = av_clipf(y/clip, -1, 1);
00409 return clip * FFSIGN(y) * (exp(log(1+mu) * fabs(y)) - 1) / mu;
00410 }
00411
00432 static int very_broken_op(int a, int b)
00433 {
00434 int x = a*b + 200;
00435 int size;
00436 const uint8_t *rtab;
00437
00438 if (x%400 || b%5)
00439 return x/400;
00440
00441 x /= 400;
00442
00443 size = tabs[b/5].size;
00444 rtab = tabs[b/5].tab;
00445 return x - rtab[size*av_log2(2*(x - 1)/size)+(x - 1)%size];
00446 }
00447
00453 static void add_peak(int period, int width, const float *shape,
00454 float ppc_gain, float *speech, int len)
00455 {
00456 int i, j;
00457
00458 const float *shape_end = shape + len;
00459 int center;
00460
00461
00462 for (i = 0; i < width/2; i++)
00463 speech[i] += ppc_gain * *shape++;
00464
00465 for (i = 1; i < ROUNDED_DIV(len,width) ; i++) {
00466 center = very_broken_op(period, i);
00467 for (j = -width/2; j < (width+1)/2; j++)
00468 speech[j+center] += ppc_gain * *shape++;
00469 }
00470
00471
00472 center = very_broken_op(period, i);
00473 for (j = -width/2; j < (width + 1)/2 && shape < shape_end; j++)
00474 speech[j+center] += ppc_gain * *shape++;
00475 }
00476
00477 static void decode_ppc(TwinContext *tctx, int period_coef, const float *shape,
00478 float ppc_gain, float *speech)
00479 {
00480 const ModeTab *mtab = tctx->mtab;
00481 int isampf = tctx->avctx->sample_rate/1000;
00482 int ibps = tctx->avctx->bit_rate/(1000 * tctx->avctx->channels);
00483 int min_period = ROUNDED_DIV( 40*2*mtab->size, isampf);
00484 int max_period = ROUNDED_DIV(6*40*2*mtab->size, isampf);
00485 int period_range = max_period - min_period;
00486
00487
00488
00489 int period = min_period +
00490 ROUNDED_DIV(period_coef*period_range, (1 << mtab->ppc_period_bit) - 1);
00491 int width;
00492
00493 if (isampf == 22 && ibps == 32) {
00494
00495 width = ROUNDED_DIV((period + 800)* mtab->peak_per2wid, 400*mtab->size);
00496 } else
00497 width = (period )* mtab->peak_per2wid/(400*mtab->size);
00498
00499 add_peak(period, width, shape, ppc_gain, speech, mtab->ppc_shape_len);
00500 }
00501
00502 static void dec_gain(TwinContext *tctx, GetBitContext *gb, enum FrameType ftype,
00503 float *out)
00504 {
00505 const ModeTab *mtab = tctx->mtab;
00506 int i, j;
00507 int sub = mtab->fmode[ftype].sub;
00508 float step = AMP_MAX / ((1 << GAIN_BITS) - 1);
00509 float sub_step = SUB_AMP_MAX / ((1 << SUB_GAIN_BITS) - 1);
00510
00511 if (ftype == FT_LONG) {
00512 for (i = 0; i < tctx->avctx->channels; i++)
00513 out[i] = (1./(1<<13)) *
00514 mulawinv(step * 0.5 + step * get_bits(gb, GAIN_BITS),
00515 AMP_MAX, MULAW_MU);
00516 } else {
00517 for (i = 0; i < tctx->avctx->channels; i++) {
00518 float val = (1./(1<<23)) *
00519 mulawinv(step * 0.5 + step * get_bits(gb, GAIN_BITS),
00520 AMP_MAX, MULAW_MU);
00521
00522 for (j = 0; j < sub; j++) {
00523 out[i*sub + j] =
00524 val*mulawinv(sub_step* 0.5 +
00525 sub_step* get_bits(gb, SUB_GAIN_BITS),
00526 SUB_AMP_MAX, MULAW_MU);
00527 }
00528 }
00529 }
00530 }
00531
00538 static void rearrange_lsp(int order, float *lsp, float min_dist)
00539 {
00540 int i;
00541 float min_dist2 = min_dist * 0.5;
00542 for (i = 1; i < order; i++)
00543 if (lsp[i] - lsp[i-1] < min_dist) {
00544 float avg = (lsp[i] + lsp[i-1]) * 0.5;
00545
00546 lsp[i-1] = avg - min_dist2;
00547 lsp[i ] = avg + min_dist2;
00548 }
00549 }
00550
00551 static void decode_lsp(TwinContext *tctx, int lpc_idx1, uint8_t *lpc_idx2,
00552 int lpc_hist_idx, float *lsp, float *hist)
00553 {
00554 const ModeTab *mtab = tctx->mtab;
00555 int i, j;
00556
00557 const float *cb = mtab->lspcodebook;
00558 const float *cb2 = cb + (1 << mtab->lsp_bit1)*mtab->n_lsp;
00559 const float *cb3 = cb2 + (1 << mtab->lsp_bit2)*mtab->n_lsp;
00560
00561 const int8_t funny_rounding[4] = {
00562 -2,
00563 mtab->lsp_split == 4 ? -2 : 1,
00564 mtab->lsp_split == 4 ? -2 : 1,
00565 0
00566 };
00567
00568 j = 0;
00569 for (i = 0; i < mtab->lsp_split; i++) {
00570 int chunk_end = ((i + 1)*mtab->n_lsp + funny_rounding[i])/mtab->lsp_split;
00571 for (; j < chunk_end; j++)
00572 lsp[j] = cb [lpc_idx1 * mtab->n_lsp + j] +
00573 cb2[lpc_idx2[i] * mtab->n_lsp + j];
00574 }
00575
00576 rearrange_lsp(mtab->n_lsp, lsp, 0.0001);
00577
00578 for (i = 0; i < mtab->n_lsp; i++) {
00579 float tmp1 = 1. - cb3[lpc_hist_idx*mtab->n_lsp + i];
00580 float tmp2 = hist[i] * cb3[lpc_hist_idx*mtab->n_lsp + i];
00581 hist[i] = lsp[i];
00582 lsp[i] = lsp[i] * tmp1 + tmp2;
00583 }
00584
00585 rearrange_lsp(mtab->n_lsp, lsp, 0.0001);
00586 rearrange_lsp(mtab->n_lsp, lsp, 0.000095);
00587 ff_sort_nearly_sorted_floats(lsp, mtab->n_lsp);
00588 }
00589
00590 static void dec_lpc_spectrum_inv(TwinContext *tctx, float *lsp,
00591 enum FrameType ftype, float *lpc)
00592 {
00593 int i;
00594 int size = tctx->mtab->size / tctx->mtab->fmode[ftype].sub;
00595
00596 for (i = 0; i < tctx->mtab->n_lsp; i++)
00597 lsp[i] = 2*cos(lsp[i]);
00598
00599 switch (ftype) {
00600 case FT_LONG:
00601 eval_lpcenv_2parts(tctx, ftype, lsp, lpc, size, 8);
00602 break;
00603 case FT_MEDIUM:
00604 eval_lpcenv_2parts(tctx, ftype, lsp, lpc, size, 2);
00605 break;
00606 case FT_SHORT:
00607 eval_lpcenv(tctx, lsp, lpc);
00608 break;
00609 }
00610 }
00611
00612 static void imdct_and_window(TwinContext *tctx, enum FrameType ftype, int wtype,
00613 float *in, float *prev, int ch)
00614 {
00615 FFTContext *mdct = &tctx->mdct_ctx[ftype];
00616 const ModeTab *mtab = tctx->mtab;
00617 int bsize = mtab->size / mtab->fmode[ftype].sub;
00618 int size = mtab->size;
00619 float *buf1 = tctx->tmp_buf;
00620 int j;
00621 int wsize;
00622 float *out = tctx->curr_frame + 2*ch*mtab->size;
00623 float *out2 = out;
00624 float *prev_buf;
00625 int first_wsize;
00626
00627 static const uint8_t wtype_to_wsize[] = {0, 0, 2, 2, 2, 1, 0, 1, 1};
00628 int types_sizes[] = {
00629 mtab->size / mtab->fmode[FT_LONG ].sub,
00630 mtab->size / mtab->fmode[FT_MEDIUM].sub,
00631 mtab->size / (2*mtab->fmode[FT_SHORT ].sub),
00632 };
00633
00634 wsize = types_sizes[wtype_to_wsize[wtype]];
00635 first_wsize = wsize;
00636 prev_buf = prev + (size - bsize)/2;
00637
00638 for (j = 0; j < mtab->fmode[ftype].sub; j++) {
00639 int sub_wtype = ftype == FT_MEDIUM ? 8 : wtype;
00640
00641 if (!j && wtype == 4)
00642 sub_wtype = 4;
00643 else if (j == mtab->fmode[ftype].sub-1 && wtype == 7)
00644 sub_wtype = 7;
00645
00646 wsize = types_sizes[wtype_to_wsize[sub_wtype]];
00647
00648 mdct->imdct_half(mdct, buf1 + bsize*j, in + bsize*j);
00649
00650 tctx->dsp.vector_fmul_window(out2,
00651 prev_buf + (bsize-wsize)/2,
00652 buf1 + bsize*j,
00653 ff_sine_windows[av_log2(wsize)],
00654 wsize/2);
00655 out2 += wsize;
00656
00657 memcpy(out2, buf1 + bsize*j + wsize/2, (bsize - wsize/2)*sizeof(float));
00658
00659 out2 += ftype == FT_MEDIUM ? (bsize-wsize)/2 : bsize - wsize;
00660
00661 prev_buf = buf1 + bsize*j + bsize/2;
00662 }
00663
00664 tctx->last_block_pos[ch] = (size + first_wsize)/2;
00665 }
00666
00667 static void imdct_output(TwinContext *tctx, enum FrameType ftype, int wtype,
00668 float *out)
00669 {
00670 const ModeTab *mtab = tctx->mtab;
00671 int size1, size2;
00672 float *prev_buf = tctx->prev_frame + tctx->last_block_pos[0];
00673 int i;
00674
00675 for (i = 0; i < tctx->avctx->channels; i++) {
00676 imdct_and_window(tctx, ftype, wtype,
00677 tctx->spectrum + i*mtab->size,
00678 prev_buf + 2*i*mtab->size,
00679 i);
00680 }
00681
00682 if (!out)
00683 return;
00684
00685 size2 = tctx->last_block_pos[0];
00686 size1 = mtab->size - size2;
00687 if (tctx->avctx->channels == 2) {
00688 tctx->dsp.butterflies_float_interleave(out, prev_buf,
00689 &prev_buf[2*mtab->size],
00690 size1);
00691
00692 out += 2 * size1;
00693
00694 tctx->dsp.butterflies_float_interleave(out, tctx->curr_frame,
00695 &tctx->curr_frame[2*mtab->size],
00696 size2);
00697 } else {
00698 memcpy(out, prev_buf, size1 * sizeof(*out));
00699
00700 out += size1;
00701
00702 memcpy(out, tctx->curr_frame, size2 * sizeof(*out));
00703 }
00704
00705 }
00706
00707 static void dec_bark_env(TwinContext *tctx, const uint8_t *in, int use_hist,
00708 int ch, float *out, float gain, enum FrameType ftype)
00709 {
00710 const ModeTab *mtab = tctx->mtab;
00711 int i,j;
00712 float *hist = tctx->bark_hist[ftype][ch];
00713 float val = ((const float []) {0.4, 0.35, 0.28})[ftype];
00714 int bark_n_coef = mtab->fmode[ftype].bark_n_coef;
00715 int fw_cb_len = mtab->fmode[ftype].bark_env_size / bark_n_coef;
00716 int idx = 0;
00717
00718 for (i = 0; i < fw_cb_len; i++)
00719 for (j = 0; j < bark_n_coef; j++, idx++) {
00720 float tmp2 =
00721 mtab->fmode[ftype].bark_cb[fw_cb_len*in[j] + i] * (1./4096);
00722 float st = use_hist ?
00723 (1. - val) * tmp2 + val*hist[idx] + 1. : tmp2 + 1.;
00724
00725 hist[idx] = tmp2;
00726 if (st < -1.) st = 1.;
00727
00728 memset_float(out, st * gain, mtab->fmode[ftype].bark_tab[idx]);
00729 out += mtab->fmode[ftype].bark_tab[idx];
00730 }
00731
00732 }
00733
00734 static void read_and_decode_spectrum(TwinContext *tctx, GetBitContext *gb,
00735 float *out, enum FrameType ftype)
00736 {
00737 const ModeTab *mtab = tctx->mtab;
00738 int channels = tctx->avctx->channels;
00739 int sub = mtab->fmode[ftype].sub;
00740 int block_size = mtab->size / sub;
00741 float gain[CHANNELS_MAX*SUBBLOCKS_MAX];
00742 float ppc_shape[PPC_SHAPE_LEN_MAX * CHANNELS_MAX * 4];
00743 uint8_t bark1[CHANNELS_MAX][SUBBLOCKS_MAX][BARK_N_COEF_MAX];
00744 uint8_t bark_use_hist[CHANNELS_MAX][SUBBLOCKS_MAX];
00745
00746 uint8_t lpc_idx1[CHANNELS_MAX];
00747 uint8_t lpc_idx2[CHANNELS_MAX][LSP_SPLIT_MAX];
00748 uint8_t lpc_hist_idx[CHANNELS_MAX];
00749
00750 int i, j, k;
00751
00752 dequant(tctx, gb, out, ftype,
00753 mtab->fmode[ftype].cb0, mtab->fmode[ftype].cb1,
00754 mtab->fmode[ftype].cb_len_read);
00755
00756 for (i = 0; i < channels; i++)
00757 for (j = 0; j < sub; j++)
00758 for (k = 0; k < mtab->fmode[ftype].bark_n_coef; k++)
00759 bark1[i][j][k] =
00760 get_bits(gb, mtab->fmode[ftype].bark_n_bit);
00761
00762 for (i = 0; i < channels; i++)
00763 for (j = 0; j < sub; j++)
00764 bark_use_hist[i][j] = get_bits1(gb);
00765
00766 dec_gain(tctx, gb, ftype, gain);
00767
00768 for (i = 0; i < channels; i++) {
00769 lpc_hist_idx[i] = get_bits(gb, tctx->mtab->lsp_bit0);
00770 lpc_idx1 [i] = get_bits(gb, tctx->mtab->lsp_bit1);
00771
00772 for (j = 0; j < tctx->mtab->lsp_split; j++)
00773 lpc_idx2[i][j] = get_bits(gb, tctx->mtab->lsp_bit2);
00774 }
00775
00776 if (ftype == FT_LONG) {
00777 int cb_len_p = (tctx->n_div[3] + mtab->ppc_shape_len*channels - 1)/
00778 tctx->n_div[3];
00779 dequant(tctx, gb, ppc_shape, FT_PPC, mtab->ppc_shape_cb,
00780 mtab->ppc_shape_cb + cb_len_p*PPC_SHAPE_CB_SIZE, cb_len_p);
00781 }
00782
00783 for (i = 0; i < channels; i++) {
00784 float *chunk = out + mtab->size * i;
00785 float lsp[LSP_COEFS_MAX];
00786
00787 for (j = 0; j < sub; j++) {
00788 dec_bark_env(tctx, bark1[i][j], bark_use_hist[i][j], i,
00789 tctx->tmp_buf, gain[sub*i+j], ftype);
00790
00791 tctx->dsp.vector_fmul(chunk + block_size*j, chunk + block_size*j, tctx->tmp_buf,
00792 block_size);
00793
00794 }
00795
00796 if (ftype == FT_LONG) {
00797 float pgain_step = 25000. / ((1 << mtab->pgain_bit) - 1);
00798 int p_coef = get_bits(gb, tctx->mtab->ppc_period_bit);
00799 int g_coef = get_bits(gb, tctx->mtab->pgain_bit);
00800 float v = 1./8192*
00801 mulawinv(pgain_step*g_coef+ pgain_step/2, 25000., PGAIN_MU);
00802
00803 decode_ppc(tctx, p_coef, ppc_shape + i*mtab->ppc_shape_len, v,
00804 chunk);
00805 }
00806
00807 decode_lsp(tctx, lpc_idx1[i], lpc_idx2[i], lpc_hist_idx[i], lsp,
00808 tctx->lsp_hist[i]);
00809
00810 dec_lpc_spectrum_inv(tctx, lsp, ftype, tctx->tmp_buf);
00811
00812 for (j = 0; j < mtab->fmode[ftype].sub; j++) {
00813 tctx->dsp.vector_fmul(chunk, chunk, tctx->tmp_buf, block_size);
00814 chunk += block_size;
00815 }
00816 }
00817 }
00818
00819 static int twin_decode_frame(AVCodecContext * avctx, void *data,
00820 int *got_frame_ptr, AVPacket *avpkt)
00821 {
00822 const uint8_t *buf = avpkt->data;
00823 int buf_size = avpkt->size;
00824 TwinContext *tctx = avctx->priv_data;
00825 GetBitContext gb;
00826 const ModeTab *mtab = tctx->mtab;
00827 float *out = NULL;
00828 enum FrameType ftype;
00829 int window_type, ret;
00830 static const enum FrameType wtype_to_ftype_table[] = {
00831 FT_LONG, FT_LONG, FT_SHORT, FT_LONG,
00832 FT_MEDIUM, FT_LONG, FT_LONG, FT_MEDIUM, FT_MEDIUM
00833 };
00834
00835 if (buf_size*8 < avctx->bit_rate*mtab->size/avctx->sample_rate + 8) {
00836 av_log(avctx, AV_LOG_ERROR,
00837 "Frame too small (%d bytes). Truncated file?\n", buf_size);
00838 return AVERROR(EINVAL);
00839 }
00840
00841
00842 if (tctx->discarded_packets >= 2) {
00843 tctx->frame.nb_samples = mtab->size;
00844 if ((ret = ff_get_buffer(avctx, &tctx->frame)) < 0) {
00845 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00846 return ret;
00847 }
00848 out = (float *)tctx->frame.data[0];
00849 }
00850
00851 init_get_bits(&gb, buf, buf_size * 8);
00852 skip_bits(&gb, get_bits(&gb, 8));
00853 window_type = get_bits(&gb, WINDOW_TYPE_BITS);
00854
00855 if (window_type > 8) {
00856 av_log(avctx, AV_LOG_ERROR, "Invalid window type, broken sample?\n");
00857 return -1;
00858 }
00859
00860 ftype = wtype_to_ftype_table[window_type];
00861
00862 read_and_decode_spectrum(tctx, &gb, tctx->spectrum, ftype);
00863
00864 imdct_output(tctx, ftype, window_type, out);
00865
00866 FFSWAP(float*, tctx->curr_frame, tctx->prev_frame);
00867
00868 if (tctx->discarded_packets < 2) {
00869 tctx->discarded_packets++;
00870 *got_frame_ptr = 0;
00871 return buf_size;
00872 }
00873
00874 *got_frame_ptr = 1;
00875 *(AVFrame *)data = tctx->frame;;
00876
00877 return buf_size;
00878 }
00879
00883 static av_cold int init_mdct_win(TwinContext *tctx)
00884 {
00885 int i, j, ret;
00886 const ModeTab *mtab = tctx->mtab;
00887 int size_s = mtab->size / mtab->fmode[FT_SHORT].sub;
00888 int size_m = mtab->size / mtab->fmode[FT_MEDIUM].sub;
00889 int channels = tctx->avctx->channels;
00890 float norm = channels == 1 ? 2. : 1.;
00891
00892 for (i = 0; i < 3; i++) {
00893 int bsize = tctx->mtab->size/tctx->mtab->fmode[i].sub;
00894 if ((ret = ff_mdct_init(&tctx->mdct_ctx[i], av_log2(bsize) + 1, 1,
00895 -sqrt(norm/bsize) / (1<<15))))
00896 return ret;
00897 }
00898
00899 FF_ALLOC_OR_GOTO(tctx->avctx, tctx->tmp_buf,
00900 mtab->size * sizeof(*tctx->tmp_buf), alloc_fail);
00901
00902 FF_ALLOC_OR_GOTO(tctx->avctx, tctx->spectrum,
00903 2 * mtab->size * channels * sizeof(*tctx->spectrum),
00904 alloc_fail);
00905 FF_ALLOC_OR_GOTO(tctx->avctx, tctx->curr_frame,
00906 2 * mtab->size * channels * sizeof(*tctx->curr_frame),
00907 alloc_fail);
00908 FF_ALLOC_OR_GOTO(tctx->avctx, tctx->prev_frame,
00909 2 * mtab->size * channels * sizeof(*tctx->prev_frame),
00910 alloc_fail);
00911
00912 for (i = 0; i < 3; i++) {
00913 int m = 4*mtab->size/mtab->fmode[i].sub;
00914 double freq = 2*M_PI/m;
00915 FF_ALLOC_OR_GOTO(tctx->avctx, tctx->cos_tabs[i],
00916 (m / 4) * sizeof(*tctx->cos_tabs[i]), alloc_fail);
00917
00918 for (j = 0; j <= m/8; j++)
00919 tctx->cos_tabs[i][j] = cos((2*j + 1)*freq);
00920 for (j = 1; j < m/8; j++)
00921 tctx->cos_tabs[i][m/4-j] = tctx->cos_tabs[i][j];
00922 }
00923
00924
00925 ff_init_ff_sine_windows(av_log2(size_m));
00926 ff_init_ff_sine_windows(av_log2(size_s/2));
00927 ff_init_ff_sine_windows(av_log2(mtab->size));
00928
00929 return 0;
00930 alloc_fail:
00931 return AVERROR(ENOMEM);
00932 }
00933
00940 static void permutate_in_line(int16_t *tab, int num_vect, int num_blocks,
00941 int block_size,
00942 const uint8_t line_len[2], int length_div,
00943 enum FrameType ftype)
00944
00945 {
00946 int i,j;
00947
00948 for (i = 0; i < line_len[0]; i++) {
00949 int shift;
00950
00951 if (num_blocks == 1 ||
00952 (ftype == FT_LONG && num_vect % num_blocks) ||
00953 (ftype != FT_LONG && num_vect & 1 ) ||
00954 i == line_len[1]) {
00955 shift = 0;
00956 } else if (ftype == FT_LONG) {
00957 shift = i;
00958 } else
00959 shift = i*i;
00960
00961 for (j = 0; j < num_vect && (j+num_vect*i < block_size*num_blocks); j++)
00962 tab[i*num_vect+j] = i*num_vect + (j + shift) % num_vect;
00963 }
00964 }
00965
00981 static void transpose_perm(int16_t *out, int16_t *in, int num_vect,
00982 const uint8_t line_len[2], int length_div)
00983 {
00984 int i,j;
00985 int cont= 0;
00986 for (i = 0; i < num_vect; i++)
00987 for (j = 0; j < line_len[i >= length_div]; j++)
00988 out[cont++] = in[j*num_vect + i];
00989 }
00990
00991 static void linear_perm(int16_t *out, int16_t *in, int n_blocks, int size)
00992 {
00993 int block_size = size/n_blocks;
00994 int i;
00995
00996 for (i = 0; i < size; i++)
00997 out[i] = block_size * (in[i] % n_blocks) + in[i] / n_blocks;
00998 }
00999
01000 static av_cold void construct_perm_table(TwinContext *tctx, int ftype)
01001 {
01002 int block_size;
01003 const ModeTab *mtab = tctx->mtab;
01004 int size;
01005 int16_t *tmp_perm = (int16_t *) tctx->tmp_buf;
01006
01007 if (ftype == FT_PPC) {
01008 size = tctx->avctx->channels;
01009 block_size = mtab->ppc_shape_len;
01010 } else {
01011 size = tctx->avctx->channels * mtab->fmode[ftype].sub;
01012 block_size = mtab->size / mtab->fmode[ftype].sub;
01013 }
01014
01015 permutate_in_line(tmp_perm, tctx->n_div[ftype], size,
01016 block_size, tctx->length[ftype],
01017 tctx->length_change[ftype], ftype);
01018
01019 transpose_perm(tctx->permut[ftype], tmp_perm, tctx->n_div[ftype],
01020 tctx->length[ftype], tctx->length_change[ftype]);
01021
01022 linear_perm(tctx->permut[ftype], tctx->permut[ftype], size,
01023 size*block_size);
01024 }
01025
01026 static av_cold void init_bitstream_params(TwinContext *tctx)
01027 {
01028 const ModeTab *mtab = tctx->mtab;
01029 int n_ch = tctx->avctx->channels;
01030 int total_fr_bits = tctx->avctx->bit_rate*mtab->size/
01031 tctx->avctx->sample_rate;
01032
01033 int lsp_bits_per_block = n_ch*(mtab->lsp_bit0 + mtab->lsp_bit1 +
01034 mtab->lsp_split*mtab->lsp_bit2);
01035
01036 int ppc_bits = n_ch*(mtab->pgain_bit + mtab->ppc_shape_bit +
01037 mtab->ppc_period_bit);
01038
01039 int bsize_no_main_cb[3];
01040 int bse_bits[3];
01041 int i;
01042 enum FrameType frametype;
01043
01044 for (i = 0; i < 3; i++)
01045
01046 bse_bits[i] = n_ch *
01047 (mtab->fmode[i].bark_n_coef * mtab->fmode[i].bark_n_bit + 1);
01048
01049 bsize_no_main_cb[2] = bse_bits[2] + lsp_bits_per_block + ppc_bits +
01050 WINDOW_TYPE_BITS + n_ch*GAIN_BITS;
01051
01052 for (i = 0; i < 2; i++)
01053 bsize_no_main_cb[i] =
01054 lsp_bits_per_block + n_ch*GAIN_BITS + WINDOW_TYPE_BITS +
01055 mtab->fmode[i].sub*(bse_bits[i] + n_ch*SUB_GAIN_BITS);
01056
01057
01058 for (i = 0; i < 4; i++) {
01059 int bit_size;
01060 int vect_size;
01061 int rounded_up, rounded_down, num_rounded_down, num_rounded_up;
01062 if (i == 3) {
01063 bit_size = n_ch * mtab->ppc_shape_bit;
01064 vect_size = n_ch * mtab->ppc_shape_len;
01065 } else {
01066 bit_size = total_fr_bits - bsize_no_main_cb[i];
01067 vect_size = n_ch * mtab->size;
01068 }
01069
01070 tctx->n_div[i] = (bit_size + 13) / 14;
01071
01072 rounded_up = (bit_size + tctx->n_div[i] - 1)/tctx->n_div[i];
01073 rounded_down = (bit_size )/tctx->n_div[i];
01074 num_rounded_down = rounded_up * tctx->n_div[i] - bit_size;
01075 num_rounded_up = tctx->n_div[i] - num_rounded_down;
01076 tctx->bits_main_spec[0][i][0] = (rounded_up + 1)/2;
01077 tctx->bits_main_spec[1][i][0] = (rounded_up )/2;
01078 tctx->bits_main_spec[0][i][1] = (rounded_down + 1)/2;
01079 tctx->bits_main_spec[1][i][1] = (rounded_down )/2;
01080 tctx->bits_main_spec_change[i] = num_rounded_up;
01081
01082 rounded_up = (vect_size + tctx->n_div[i] - 1)/tctx->n_div[i];
01083 rounded_down = (vect_size )/tctx->n_div[i];
01084 num_rounded_down = rounded_up * tctx->n_div[i] - vect_size;
01085 num_rounded_up = tctx->n_div[i] - num_rounded_down;
01086 tctx->length[i][0] = rounded_up;
01087 tctx->length[i][1] = rounded_down;
01088 tctx->length_change[i] = num_rounded_up;
01089 }
01090
01091 for (frametype = FT_SHORT; frametype <= FT_PPC; frametype++)
01092 construct_perm_table(tctx, frametype);
01093 }
01094
01095 static av_cold int twin_decode_close(AVCodecContext *avctx)
01096 {
01097 TwinContext *tctx = avctx->priv_data;
01098 int i;
01099
01100 for (i = 0; i < 3; i++) {
01101 ff_mdct_end(&tctx->mdct_ctx[i]);
01102 av_free(tctx->cos_tabs[i]);
01103 }
01104
01105
01106 av_free(tctx->curr_frame);
01107 av_free(tctx->spectrum);
01108 av_free(tctx->prev_frame);
01109 av_free(tctx->tmp_buf);
01110
01111 return 0;
01112 }
01113
01114 static av_cold int twin_decode_init(AVCodecContext *avctx)
01115 {
01116 int ret;
01117 TwinContext *tctx = avctx->priv_data;
01118 int isampf, ibps;
01119
01120 tctx->avctx = avctx;
01121 avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
01122
01123 if (!avctx->extradata || avctx->extradata_size < 12) {
01124 av_log(avctx, AV_LOG_ERROR, "Missing or incomplete extradata\n");
01125 return AVERROR_INVALIDDATA;
01126 }
01127 avctx->channels = AV_RB32(avctx->extradata ) + 1;
01128 avctx->bit_rate = AV_RB32(avctx->extradata + 4) * 1000;
01129 isampf = AV_RB32(avctx->extradata + 8);
01130 switch (isampf) {
01131 case 44: avctx->sample_rate = 44100; break;
01132 case 22: avctx->sample_rate = 22050; break;
01133 case 11: avctx->sample_rate = 11025; break;
01134 default: avctx->sample_rate = isampf * 1000; break;
01135 }
01136
01137 if (avctx->channels > CHANNELS_MAX) {
01138 av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels: %i\n",
01139 avctx->channels);
01140 return -1;
01141 }
01142 ibps = avctx->bit_rate / (1000 * avctx->channels);
01143 if (ibps < 8 || ibps > 48) {
01144 av_log(avctx, AV_LOG_ERROR, "Bad bitrate per channel value %d\n", ibps);
01145 return AVERROR_INVALIDDATA;
01146 }
01147
01148 switch ((isampf << 8) + ibps) {
01149 case (8 <<8) + 8: tctx->mtab = &mode_08_08; break;
01150 case (11<<8) + 8: tctx->mtab = &mode_11_08; break;
01151 case (11<<8) + 10: tctx->mtab = &mode_11_10; break;
01152 case (16<<8) + 16: tctx->mtab = &mode_16_16; break;
01153 case (22<<8) + 20: tctx->mtab = &mode_22_20; break;
01154 case (22<<8) + 24: tctx->mtab = &mode_22_24; break;
01155 case (22<<8) + 32: tctx->mtab = &mode_22_32; break;
01156 case (44<<8) + 40: tctx->mtab = &mode_44_40; break;
01157 case (44<<8) + 48: tctx->mtab = &mode_44_48; break;
01158 default:
01159 av_log(avctx, AV_LOG_ERROR, "This version does not support %d kHz - %d kbit/s/ch mode.\n", isampf, isampf);
01160 return -1;
01161 }
01162
01163 dsputil_init(&tctx->dsp, avctx);
01164 if ((ret = init_mdct_win(tctx))) {
01165 av_log(avctx, AV_LOG_ERROR, "Error initializing MDCT\n");
01166 twin_decode_close(avctx);
01167 return ret;
01168 }
01169 init_bitstream_params(tctx);
01170
01171 memset_float(tctx->bark_hist[0][0], 0.1, FF_ARRAY_ELEMS(tctx->bark_hist));
01172
01173 avcodec_get_frame_defaults(&tctx->frame);
01174 avctx->coded_frame = &tctx->frame;
01175
01176 return 0;
01177 }
01178
01179 AVCodec ff_twinvq_decoder = {
01180 .name = "twinvq",
01181 .type = AVMEDIA_TYPE_AUDIO,
01182 .id = CODEC_ID_TWINVQ,
01183 .priv_data_size = sizeof(TwinContext),
01184 .init = twin_decode_init,
01185 .close = twin_decode_close,
01186 .decode = twin_decode_frame,
01187 .capabilities = CODEC_CAP_DR1,
01188 .long_name = NULL_IF_CONFIG_SMALL("VQF TwinVQ"),
01189 };