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00022 #include "avcodec.h"
00023 #include "get_bits.h"
00024 #include "dsputil.h"
00025 #include "fft.h"
00026 #include "lsp.h"
00027 #include "sinewin.h"
00028
00029 #include <math.h>
00030 #include <stdint.h>
00031
00032 #include "twinvq_data.h"
00033
00034 enum FrameType {
00035 FT_SHORT = 0,
00036 FT_MEDIUM,
00037 FT_LONG,
00038 FT_PPC,
00039 };
00040
00044 struct FrameMode {
00045 uint8_t sub;
00046 const uint16_t *bark_tab;
00047
00049 uint8_t bark_env_size;
00050
00051 const int16_t *bark_cb;
00052 uint8_t bark_n_coef;
00053 uint8_t bark_n_bit;
00054
00056
00057 const int16_t *cb0;
00058 const int16_t *cb1;
00060
00061 uint8_t cb_len_read;
00062 };
00063
00068 typedef struct {
00069 struct FrameMode fmode[3];
00070
00071 uint16_t size;
00072 uint8_t n_lsp;
00073 const float *lspcodebook;
00074
00075
00076 uint8_t lsp_bit0;
00077 uint8_t lsp_bit1;
00078 uint8_t lsp_bit2;
00079
00080 uint8_t lsp_split;
00081 const int16_t *ppc_shape_cb;
00082
00084 uint8_t ppc_period_bit;
00085
00086 uint8_t ppc_shape_bit;
00087 uint8_t ppc_shape_len;
00088 uint8_t pgain_bit;
00089
00091 uint16_t peak_per2wid;
00092 } ModeTab;
00093
00094 static const ModeTab mode_08_08 = {
00095 {
00096 { 8, bark_tab_s08_64, 10, tab.fcb08s , 1, 5, tab.cb0808s0, tab.cb0808s1, 18},
00097 { 2, bark_tab_m08_256, 20, tab.fcb08m , 2, 5, tab.cb0808m0, tab.cb0808m1, 16},
00098 { 1, bark_tab_l08_512, 30, tab.fcb08l , 3, 6, tab.cb0808l0, tab.cb0808l1, 17}
00099 },
00100 512 , 12, tab.lsp08, 1, 5, 3, 3, tab.shape08 , 8, 28, 20, 6, 40
00101 };
00102
00103 static const ModeTab mode_11_08 = {
00104 {
00105 { 8, bark_tab_s11_64, 10, tab.fcb11s , 1, 5, tab.cb1108s0, tab.cb1108s1, 29},
00106 { 2, bark_tab_m11_256, 20, tab.fcb11m , 2, 5, tab.cb1108m0, tab.cb1108m1, 24},
00107 { 1, bark_tab_l11_512, 30, tab.fcb11l , 3, 6, tab.cb1108l0, tab.cb1108l1, 27}
00108 },
00109 512 , 16, tab.lsp11, 1, 6, 4, 3, tab.shape11 , 9, 36, 30, 7, 90
00110 };
00111
00112 static const ModeTab mode_11_10 = {
00113 {
00114 { 8, bark_tab_s11_64, 10, tab.fcb11s , 1, 5, tab.cb1110s0, tab.cb1110s1, 21},
00115 { 2, bark_tab_m11_256, 20, tab.fcb11m , 2, 5, tab.cb1110m0, tab.cb1110m1, 18},
00116 { 1, bark_tab_l11_512, 30, tab.fcb11l , 3, 6, tab.cb1110l0, tab.cb1110l1, 20}
00117 },
00118 512 , 16, tab.lsp11, 1, 6, 4, 3, tab.shape11 , 9, 36, 30, 7, 90
00119 };
00120
00121 static const ModeTab mode_16_16 = {
00122 {
00123 { 8, bark_tab_s16_128, 10, tab.fcb16s , 1, 5, tab.cb1616s0, tab.cb1616s1, 16},
00124 { 2, bark_tab_m16_512, 20, tab.fcb16m , 2, 5, tab.cb1616m0, tab.cb1616m1, 15},
00125 { 1, bark_tab_l16_1024,30, tab.fcb16l , 3, 6, tab.cb1616l0, tab.cb1616l1, 16}
00126 },
00127 1024, 16, tab.lsp16, 1, 6, 4, 3, tab.shape16 , 9, 56, 60, 7, 180
00128 };
00129
00130 static const ModeTab mode_22_20 = {
00131 {
00132 { 8, bark_tab_s22_128, 10, tab.fcb22s_1, 1, 6, tab.cb2220s0, tab.cb2220s1, 18},
00133 { 2, bark_tab_m22_512, 20, tab.fcb22m_1, 2, 6, tab.cb2220m0, tab.cb2220m1, 17},
00134 { 1, bark_tab_l22_1024,32, tab.fcb22l_1, 4, 6, tab.cb2220l0, tab.cb2220l1, 18}
00135 },
00136 1024, 16, tab.lsp22_1, 1, 6, 4, 3, tab.shape22_1, 9, 56, 36, 7, 144
00137 };
00138
00139 static const ModeTab mode_22_24 = {
00140 {
00141 { 8, bark_tab_s22_128, 10, tab.fcb22s_1, 1, 6, tab.cb2224s0, tab.cb2224s1, 15},
00142 { 2, bark_tab_m22_512, 20, tab.fcb22m_1, 2, 6, tab.cb2224m0, tab.cb2224m1, 14},
00143 { 1, bark_tab_l22_1024,32, tab.fcb22l_1, 4, 6, tab.cb2224l0, tab.cb2224l1, 15}
00144 },
00145 1024, 16, tab.lsp22_1, 1, 6, 4, 3, tab.shape22_1, 9, 56, 36, 7, 144
00146 };
00147
00148 static const ModeTab mode_22_32 = {
00149 {
00150 { 4, bark_tab_s22_128, 10, tab.fcb22s_2, 1, 6, tab.cb2232s0, tab.cb2232s1, 11},
00151 { 2, bark_tab_m22_256, 20, tab.fcb22m_2, 2, 6, tab.cb2232m0, tab.cb2232m1, 11},
00152 { 1, bark_tab_l22_512, 32, tab.fcb22l_2, 4, 6, tab.cb2232l0, tab.cb2232l1, 12}
00153 },
00154 512 , 16, tab.lsp22_2, 1, 6, 4, 4, tab.shape22_2, 9, 56, 36, 7, 72
00155 };
00156
00157 static const ModeTab mode_44_40 = {
00158 {
00159 {16, bark_tab_s44_128, 10, tab.fcb44s , 1, 6, tab.cb4440s0, tab.cb4440s1, 18},
00160 { 4, bark_tab_m44_512, 20, tab.fcb44m , 2, 6, tab.cb4440m0, tab.cb4440m1, 17},
00161 { 1, bark_tab_l44_2048,40, tab.fcb44l , 4, 6, tab.cb4440l0, tab.cb4440l1, 17}
00162 },
00163 2048, 20, tab.lsp44, 1, 6, 4, 4, tab.shape44 , 9, 84, 54, 7, 432
00164 };
00165
00166 static const ModeTab mode_44_48 = {
00167 {
00168 {16, bark_tab_s44_128, 10, tab.fcb44s , 1, 6, tab.cb4448s0, tab.cb4448s1, 15},
00169 { 4, bark_tab_m44_512, 20, tab.fcb44m , 2, 6, tab.cb4448m0, tab.cb4448m1, 14},
00170 { 1, bark_tab_l44_2048,40, tab.fcb44l , 4, 6, tab.cb4448l0, tab.cb4448l1, 14}
00171 },
00172 2048, 20, tab.lsp44, 1, 6, 4, 4, tab.shape44 , 9, 84, 54, 7, 432
00173 };
00174
00175 typedef struct TwinContext {
00176 AVCodecContext *avctx;
00177 AVFrame frame;
00178 DSPContext dsp;
00179 FFTContext mdct_ctx[3];
00180
00181 const ModeTab *mtab;
00182
00183
00184 float lsp_hist[2][20];
00185 float bark_hist[3][2][40];
00186
00187
00188 int16_t permut[4][4096];
00189 uint8_t length[4][2];
00190 uint8_t length_change[4];
00191 uint8_t bits_main_spec[2][4][2];
00192 int bits_main_spec_change[4];
00193 int n_div[4];
00194
00195 float *spectrum;
00196 float *curr_frame;
00197 float *prev_frame;
00198 int last_block_pos[2];
00199 int discarded_packets;
00200
00201 float *cos_tabs[3];
00202
00203
00204 float *tmp_buf;
00205 } TwinContext;
00206
00207 #define PPC_SHAPE_CB_SIZE 64
00208 #define PPC_SHAPE_LEN_MAX 60
00209 #define SUB_AMP_MAX 4500.0
00210 #define MULAW_MU 100.0
00211 #define GAIN_BITS 8
00212 #define AMP_MAX 13000.0
00213 #define SUB_GAIN_BITS 5
00214 #define WINDOW_TYPE_BITS 4
00215 #define PGAIN_MU 200
00216 #define LSP_COEFS_MAX 20
00217 #define LSP_SPLIT_MAX 4
00218 #define CHANNELS_MAX 2
00219 #define SUBBLOCKS_MAX 16
00220 #define BARK_N_COEF_MAX 4
00221
00223 static void memset_float(float *buf, float val, int size)
00224 {
00225 while (size--)
00226 *buf++ = val;
00227 }
00228
00241 static float eval_lpc_spectrum(const float *lsp, float cos_val, int order)
00242 {
00243 int j;
00244 float p = 0.5f;
00245 float q = 0.5f;
00246 float two_cos_w = 2.0f*cos_val;
00247
00248 for (j = 0; j + 1 < order; j += 2*2) {
00249
00250 q *= lsp[j ] - two_cos_w;
00251 p *= lsp[j+1] - two_cos_w;
00252
00253 q *= lsp[j+2] - two_cos_w;
00254 p *= lsp[j+3] - two_cos_w;
00255 }
00256
00257 p *= p * (2.0f - two_cos_w);
00258 q *= q * (2.0f + two_cos_w);
00259
00260 return 0.5 / (p + q);
00261 }
00262
00266 static void eval_lpcenv(TwinContext *tctx, const float *cos_vals, float *lpc)
00267 {
00268 int i;
00269 const ModeTab *mtab = tctx->mtab;
00270 int size_s = mtab->size / mtab->fmode[FT_SHORT].sub;
00271
00272 for (i = 0; i < size_s/2; i++) {
00273 float cos_i = tctx->cos_tabs[0][i];
00274 lpc[i] = eval_lpc_spectrum(cos_vals, cos_i, mtab->n_lsp);
00275 lpc[size_s-i-1] = eval_lpc_spectrum(cos_vals, -cos_i, mtab->n_lsp);
00276 }
00277 }
00278
00279 static void interpolate(float *out, float v1, float v2, int size)
00280 {
00281 int i;
00282 float step = (v1 - v2)/(size + 1);
00283
00284 for (i = 0; i < size; i++) {
00285 v2 += step;
00286 out[i] = v2;
00287 }
00288 }
00289
00290 static inline float get_cos(int idx, int part, const float *cos_tab, int size)
00291 {
00292 return part ? -cos_tab[size - idx - 1] :
00293 cos_tab[ idx ];
00294 }
00295
00310 static inline void eval_lpcenv_or_interp(TwinContext *tctx,
00311 enum FrameType ftype,
00312 float *out, const float *in,
00313 int size, int step, int part)
00314 {
00315 int i;
00316 const ModeTab *mtab = tctx->mtab;
00317 const float *cos_tab = tctx->cos_tabs[ftype];
00318
00319
00320 for (i = 0; i < size; i += step)
00321 out[i] =
00322 eval_lpc_spectrum(in,
00323 get_cos(i, part, cos_tab, size),
00324 mtab->n_lsp);
00325
00326
00327 for (i = step; i <= size - 2*step; i += step) {
00328 if (out[i + step] + out[i - step] > 1.95*out[i] ||
00329 out[i + step] >= out[i - step]) {
00330 interpolate(out + i - step + 1, out[i], out[i-step], step - 1);
00331 } else {
00332 out[i - step/2] =
00333 eval_lpc_spectrum(in,
00334 get_cos(i-step/2, part, cos_tab, size),
00335 mtab->n_lsp);
00336 interpolate(out + i - step + 1, out[i-step/2], out[i-step ], step/2 - 1);
00337 interpolate(out + i - step/2 + 1, out[i ], out[i-step/2], step/2 - 1);
00338 }
00339 }
00340
00341 interpolate(out + size - 2*step + 1, out[size-step], out[size - 2*step], step - 1);
00342 }
00343
00344 static void eval_lpcenv_2parts(TwinContext *tctx, enum FrameType ftype,
00345 const float *buf, float *lpc,
00346 int size, int step)
00347 {
00348 eval_lpcenv_or_interp(tctx, ftype, lpc , buf, size/2, step, 0);
00349 eval_lpcenv_or_interp(tctx, ftype, lpc + size/2, buf, size/2, 2*step, 1);
00350
00351 interpolate(lpc+size/2-step+1, lpc[size/2], lpc[size/2-step], step);
00352
00353 memset_float(lpc + size - 2*step + 1, lpc[size - 2*step], 2*step - 1);
00354 }
00355
00361 static void dequant(TwinContext *tctx, GetBitContext *gb, float *out,
00362 enum FrameType ftype,
00363 const int16_t *cb0, const int16_t *cb1, int cb_len)
00364 {
00365 int pos = 0;
00366 int i, j;
00367
00368 for (i = 0; i < tctx->n_div[ftype]; i++) {
00369 int tmp0, tmp1;
00370 int sign0 = 1;
00371 int sign1 = 1;
00372 const int16_t *tab0, *tab1;
00373 int length = tctx->length[ftype][i >= tctx->length_change[ftype]];
00374 int bitstream_second_part = (i >= tctx->bits_main_spec_change[ftype]);
00375
00376 int bits = tctx->bits_main_spec[0][ftype][bitstream_second_part];
00377 if (bits == 7) {
00378 if (get_bits1(gb))
00379 sign0 = -1;
00380 bits = 6;
00381 }
00382 tmp0 = get_bits(gb, bits);
00383
00384 bits = tctx->bits_main_spec[1][ftype][bitstream_second_part];
00385
00386 if (bits == 7) {
00387 if (get_bits1(gb))
00388 sign1 = -1;
00389
00390 bits = 6;
00391 }
00392 tmp1 = get_bits(gb, bits);
00393
00394 tab0 = cb0 + tmp0*cb_len;
00395 tab1 = cb1 + tmp1*cb_len;
00396
00397 for (j = 0; j < length; j++)
00398 out[tctx->permut[ftype][pos+j]] = sign0*tab0[j] + sign1*tab1[j];
00399
00400 pos += length;
00401 }
00402
00403 }
00404
00405 static inline float mulawinv(float y, float clip, float mu)
00406 {
00407 y = av_clipf(y/clip, -1, 1);
00408 return clip * FFSIGN(y) * (exp(log(1+mu) * fabs(y)) - 1) / mu;
00409 }
00410
00431 static int very_broken_op(int a, int b)
00432 {
00433 int x = a*b + 200;
00434 int size;
00435 const uint8_t *rtab;
00436
00437 if (x%400 || b%5)
00438 return x/400;
00439
00440 x /= 400;
00441
00442 size = tabs[b/5].size;
00443 rtab = tabs[b/5].tab;
00444 return x - rtab[size*av_log2(2*(x - 1)/size)+(x - 1)%size];
00445 }
00446
00452 static void add_peak(int period, int width, const float *shape,
00453 float ppc_gain, float *speech, int len)
00454 {
00455 int i, j;
00456
00457 const float *shape_end = shape + len;
00458 int center;
00459
00460
00461 for (i = 0; i < width/2; i++)
00462 speech[i] += ppc_gain * *shape++;
00463
00464 for (i = 1; i < ROUNDED_DIV(len,width) ; i++) {
00465 center = very_broken_op(period, i);
00466 for (j = -width/2; j < (width+1)/2; j++)
00467 speech[j+center] += ppc_gain * *shape++;
00468 }
00469
00470
00471 center = very_broken_op(period, i);
00472 for (j = -width/2; j < (width + 1)/2 && shape < shape_end; j++)
00473 speech[j+center] += ppc_gain * *shape++;
00474 }
00475
00476 static void decode_ppc(TwinContext *tctx, int period_coef, const float *shape,
00477 float ppc_gain, float *speech)
00478 {
00479 const ModeTab *mtab = tctx->mtab;
00480 int isampf = tctx->avctx->sample_rate/1000;
00481 int ibps = tctx->avctx->bit_rate/(1000 * tctx->avctx->channels);
00482 int min_period = ROUNDED_DIV( 40*2*mtab->size, isampf);
00483 int max_period = ROUNDED_DIV(6*40*2*mtab->size, isampf);
00484 int period_range = max_period - min_period;
00485
00486
00487
00488 int period = min_period +
00489 ROUNDED_DIV(period_coef*period_range, (1 << mtab->ppc_period_bit) - 1);
00490 int width;
00491
00492 if (isampf == 22 && ibps == 32) {
00493
00494 width = ROUNDED_DIV((period + 800)* mtab->peak_per2wid, 400*mtab->size);
00495 } else
00496 width = (period )* mtab->peak_per2wid/(400*mtab->size);
00497
00498 add_peak(period, width, shape, ppc_gain, speech, mtab->ppc_shape_len);
00499 }
00500
00501 static void dec_gain(TwinContext *tctx, GetBitContext *gb, enum FrameType ftype,
00502 float *out)
00503 {
00504 const ModeTab *mtab = tctx->mtab;
00505 int i, j;
00506 int sub = mtab->fmode[ftype].sub;
00507 float step = AMP_MAX / ((1 << GAIN_BITS) - 1);
00508 float sub_step = SUB_AMP_MAX / ((1 << SUB_GAIN_BITS) - 1);
00509
00510 if (ftype == FT_LONG) {
00511 for (i = 0; i < tctx->avctx->channels; i++)
00512 out[i] = (1./(1<<13)) *
00513 mulawinv(step * 0.5 + step * get_bits(gb, GAIN_BITS),
00514 AMP_MAX, MULAW_MU);
00515 } else {
00516 for (i = 0; i < tctx->avctx->channels; i++) {
00517 float val = (1./(1<<23)) *
00518 mulawinv(step * 0.5 + step * get_bits(gb, GAIN_BITS),
00519 AMP_MAX, MULAW_MU);
00520
00521 for (j = 0; j < sub; j++) {
00522 out[i*sub + j] =
00523 val*mulawinv(sub_step* 0.5 +
00524 sub_step* get_bits(gb, SUB_GAIN_BITS),
00525 SUB_AMP_MAX, MULAW_MU);
00526 }
00527 }
00528 }
00529 }
00530
00537 static void rearrange_lsp(int order, float *lsp, float min_dist)
00538 {
00539 int i;
00540 float min_dist2 = min_dist * 0.5;
00541 for (i = 1; i < order; i++)
00542 if (lsp[i] - lsp[i-1] < min_dist) {
00543 float avg = (lsp[i] + lsp[i-1]) * 0.5;
00544
00545 lsp[i-1] = avg - min_dist2;
00546 lsp[i ] = avg + min_dist2;
00547 }
00548 }
00549
00550 static void decode_lsp(TwinContext *tctx, int lpc_idx1, uint8_t *lpc_idx2,
00551 int lpc_hist_idx, float *lsp, float *hist)
00552 {
00553 const ModeTab *mtab = tctx->mtab;
00554 int i, j;
00555
00556 const float *cb = mtab->lspcodebook;
00557 const float *cb2 = cb + (1 << mtab->lsp_bit1)*mtab->n_lsp;
00558 const float *cb3 = cb2 + (1 << mtab->lsp_bit2)*mtab->n_lsp;
00559
00560 const int8_t funny_rounding[4] = {
00561 -2,
00562 mtab->lsp_split == 4 ? -2 : 1,
00563 mtab->lsp_split == 4 ? -2 : 1,
00564 0
00565 };
00566
00567 j = 0;
00568 for (i = 0; i < mtab->lsp_split; i++) {
00569 int chunk_end = ((i + 1)*mtab->n_lsp + funny_rounding[i])/mtab->lsp_split;
00570 for (; j < chunk_end; j++)
00571 lsp[j] = cb [lpc_idx1 * mtab->n_lsp + j] +
00572 cb2[lpc_idx2[i] * mtab->n_lsp + j];
00573 }
00574
00575 rearrange_lsp(mtab->n_lsp, lsp, 0.0001);
00576
00577 for (i = 0; i < mtab->n_lsp; i++) {
00578 float tmp1 = 1. - cb3[lpc_hist_idx*mtab->n_lsp + i];
00579 float tmp2 = hist[i] * cb3[lpc_hist_idx*mtab->n_lsp + i];
00580 hist[i] = lsp[i];
00581 lsp[i] = lsp[i] * tmp1 + tmp2;
00582 }
00583
00584 rearrange_lsp(mtab->n_lsp, lsp, 0.0001);
00585 rearrange_lsp(mtab->n_lsp, lsp, 0.000095);
00586 ff_sort_nearly_sorted_floats(lsp, mtab->n_lsp);
00587 }
00588
00589 static void dec_lpc_spectrum_inv(TwinContext *tctx, float *lsp,
00590 enum FrameType ftype, float *lpc)
00591 {
00592 int i;
00593 int size = tctx->mtab->size / tctx->mtab->fmode[ftype].sub;
00594
00595 for (i = 0; i < tctx->mtab->n_lsp; i++)
00596 lsp[i] = 2*cos(lsp[i]);
00597
00598 switch (ftype) {
00599 case FT_LONG:
00600 eval_lpcenv_2parts(tctx, ftype, lsp, lpc, size, 8);
00601 break;
00602 case FT_MEDIUM:
00603 eval_lpcenv_2parts(tctx, ftype, lsp, lpc, size, 2);
00604 break;
00605 case FT_SHORT:
00606 eval_lpcenv(tctx, lsp, lpc);
00607 break;
00608 }
00609 }
00610
00611 static void imdct_and_window(TwinContext *tctx, enum FrameType ftype, int wtype,
00612 float *in, float *prev, int ch)
00613 {
00614 FFTContext *mdct = &tctx->mdct_ctx[ftype];
00615 const ModeTab *mtab = tctx->mtab;
00616 int bsize = mtab->size / mtab->fmode[ftype].sub;
00617 int size = mtab->size;
00618 float *buf1 = tctx->tmp_buf;
00619 int j;
00620 int wsize;
00621 float *out = tctx->curr_frame + 2*ch*mtab->size;
00622 float *out2 = out;
00623 float *prev_buf;
00624 int first_wsize;
00625
00626 static const uint8_t wtype_to_wsize[] = {0, 0, 2, 2, 2, 1, 0, 1, 1};
00627 int types_sizes[] = {
00628 mtab->size / mtab->fmode[FT_LONG ].sub,
00629 mtab->size / mtab->fmode[FT_MEDIUM].sub,
00630 mtab->size / (2*mtab->fmode[FT_SHORT ].sub),
00631 };
00632
00633 wsize = types_sizes[wtype_to_wsize[wtype]];
00634 first_wsize = wsize;
00635 prev_buf = prev + (size - bsize)/2;
00636
00637 for (j = 0; j < mtab->fmode[ftype].sub; j++) {
00638 int sub_wtype = ftype == FT_MEDIUM ? 8 : wtype;
00639
00640 if (!j && wtype == 4)
00641 sub_wtype = 4;
00642 else if (j == mtab->fmode[ftype].sub-1 && wtype == 7)
00643 sub_wtype = 7;
00644
00645 wsize = types_sizes[wtype_to_wsize[sub_wtype]];
00646
00647 mdct->imdct_half(mdct, buf1 + bsize*j, in + bsize*j);
00648
00649 tctx->dsp.vector_fmul_window(out2,
00650 prev_buf + (bsize-wsize)/2,
00651 buf1 + bsize*j,
00652 ff_sine_windows[av_log2(wsize)],
00653 wsize/2);
00654 out2 += wsize;
00655
00656 memcpy(out2, buf1 + bsize*j + wsize/2, (bsize - wsize/2)*sizeof(float));
00657
00658 out2 += ftype == FT_MEDIUM ? (bsize-wsize)/2 : bsize - wsize;
00659
00660 prev_buf = buf1 + bsize*j + bsize/2;
00661 }
00662
00663 tctx->last_block_pos[ch] = (size + first_wsize)/2;
00664 }
00665
00666 static void imdct_output(TwinContext *tctx, enum FrameType ftype, int wtype,
00667 float *out)
00668 {
00669 const ModeTab *mtab = tctx->mtab;
00670 int size1, size2;
00671 float *prev_buf = tctx->prev_frame + tctx->last_block_pos[0];
00672 int i;
00673
00674 for (i = 0; i < tctx->avctx->channels; i++) {
00675 imdct_and_window(tctx, ftype, wtype,
00676 tctx->spectrum + i*mtab->size,
00677 prev_buf + 2*i*mtab->size,
00678 i);
00679 }
00680
00681 if (!out)
00682 return;
00683
00684 size2 = tctx->last_block_pos[0];
00685 size1 = mtab->size - size2;
00686 if (tctx->avctx->channels == 2) {
00687 tctx->dsp.butterflies_float_interleave(out, prev_buf,
00688 &prev_buf[2*mtab->size],
00689 size1);
00690
00691 out += 2 * size1;
00692
00693 tctx->dsp.butterflies_float_interleave(out, tctx->curr_frame,
00694 &tctx->curr_frame[2*mtab->size],
00695 size2);
00696 } else {
00697 memcpy(out, prev_buf, size1 * sizeof(*out));
00698
00699 out += size1;
00700
00701 memcpy(out, tctx->curr_frame, size2 * sizeof(*out));
00702 }
00703
00704 }
00705
00706 static void dec_bark_env(TwinContext *tctx, const uint8_t *in, int use_hist,
00707 int ch, float *out, float gain, enum FrameType ftype)
00708 {
00709 const ModeTab *mtab = tctx->mtab;
00710 int i,j;
00711 float *hist = tctx->bark_hist[ftype][ch];
00712 float val = ((const float []) {0.4, 0.35, 0.28})[ftype];
00713 int bark_n_coef = mtab->fmode[ftype].bark_n_coef;
00714 int fw_cb_len = mtab->fmode[ftype].bark_env_size / bark_n_coef;
00715 int idx = 0;
00716
00717 for (i = 0; i < fw_cb_len; i++)
00718 for (j = 0; j < bark_n_coef; j++, idx++) {
00719 float tmp2 =
00720 mtab->fmode[ftype].bark_cb[fw_cb_len*in[j] + i] * (1./4096);
00721 float st = use_hist ?
00722 (1. - val) * tmp2 + val*hist[idx] + 1. : tmp2 + 1.;
00723
00724 hist[idx] = tmp2;
00725 if (st < -1.) st = 1.;
00726
00727 memset_float(out, st * gain, mtab->fmode[ftype].bark_tab[idx]);
00728 out += mtab->fmode[ftype].bark_tab[idx];
00729 }
00730
00731 }
00732
00733 static void read_and_decode_spectrum(TwinContext *tctx, GetBitContext *gb,
00734 float *out, enum FrameType ftype)
00735 {
00736 const ModeTab *mtab = tctx->mtab;
00737 int channels = tctx->avctx->channels;
00738 int sub = mtab->fmode[ftype].sub;
00739 int block_size = mtab->size / sub;
00740 float gain[CHANNELS_MAX*SUBBLOCKS_MAX];
00741 float ppc_shape[PPC_SHAPE_LEN_MAX * CHANNELS_MAX * 4];
00742 uint8_t bark1[CHANNELS_MAX][SUBBLOCKS_MAX][BARK_N_COEF_MAX];
00743 uint8_t bark_use_hist[CHANNELS_MAX][SUBBLOCKS_MAX];
00744
00745 uint8_t lpc_idx1[CHANNELS_MAX];
00746 uint8_t lpc_idx2[CHANNELS_MAX][LSP_SPLIT_MAX];
00747 uint8_t lpc_hist_idx[CHANNELS_MAX];
00748
00749 int i, j, k;
00750
00751 dequant(tctx, gb, out, ftype,
00752 mtab->fmode[ftype].cb0, mtab->fmode[ftype].cb1,
00753 mtab->fmode[ftype].cb_len_read);
00754
00755 for (i = 0; i < channels; i++)
00756 for (j = 0; j < sub; j++)
00757 for (k = 0; k < mtab->fmode[ftype].bark_n_coef; k++)
00758 bark1[i][j][k] =
00759 get_bits(gb, mtab->fmode[ftype].bark_n_bit);
00760
00761 for (i = 0; i < channels; i++)
00762 for (j = 0; j < sub; j++)
00763 bark_use_hist[i][j] = get_bits1(gb);
00764
00765 dec_gain(tctx, gb, ftype, gain);
00766
00767 for (i = 0; i < channels; i++) {
00768 lpc_hist_idx[i] = get_bits(gb, tctx->mtab->lsp_bit0);
00769 lpc_idx1 [i] = get_bits(gb, tctx->mtab->lsp_bit1);
00770
00771 for (j = 0; j < tctx->mtab->lsp_split; j++)
00772 lpc_idx2[i][j] = get_bits(gb, tctx->mtab->lsp_bit2);
00773 }
00774
00775 if (ftype == FT_LONG) {
00776 int cb_len_p = (tctx->n_div[3] + mtab->ppc_shape_len*channels - 1)/
00777 tctx->n_div[3];
00778 dequant(tctx, gb, ppc_shape, FT_PPC, mtab->ppc_shape_cb,
00779 mtab->ppc_shape_cb + cb_len_p*PPC_SHAPE_CB_SIZE, cb_len_p);
00780 }
00781
00782 for (i = 0; i < channels; i++) {
00783 float *chunk = out + mtab->size * i;
00784 float lsp[LSP_COEFS_MAX];
00785
00786 for (j = 0; j < sub; j++) {
00787 dec_bark_env(tctx, bark1[i][j], bark_use_hist[i][j], i,
00788 tctx->tmp_buf, gain[sub*i+j], ftype);
00789
00790 tctx->dsp.vector_fmul(chunk + block_size*j, chunk + block_size*j, tctx->tmp_buf,
00791 block_size);
00792
00793 }
00794
00795 if (ftype == FT_LONG) {
00796 float pgain_step = 25000. / ((1 << mtab->pgain_bit) - 1);
00797 int p_coef = get_bits(gb, tctx->mtab->ppc_period_bit);
00798 int g_coef = get_bits(gb, tctx->mtab->pgain_bit);
00799 float v = 1./8192*
00800 mulawinv(pgain_step*g_coef+ pgain_step/2, 25000., PGAIN_MU);
00801
00802 decode_ppc(tctx, p_coef, ppc_shape + i*mtab->ppc_shape_len, v,
00803 chunk);
00804 }
00805
00806 decode_lsp(tctx, lpc_idx1[i], lpc_idx2[i], lpc_hist_idx[i], lsp,
00807 tctx->lsp_hist[i]);
00808
00809 dec_lpc_spectrum_inv(tctx, lsp, ftype, tctx->tmp_buf);
00810
00811 for (j = 0; j < mtab->fmode[ftype].sub; j++) {
00812 tctx->dsp.vector_fmul(chunk, chunk, tctx->tmp_buf, block_size);
00813 chunk += block_size;
00814 }
00815 }
00816 }
00817
00818 static int twin_decode_frame(AVCodecContext * avctx, void *data,
00819 int *got_frame_ptr, AVPacket *avpkt)
00820 {
00821 const uint8_t *buf = avpkt->data;
00822 int buf_size = avpkt->size;
00823 TwinContext *tctx = avctx->priv_data;
00824 GetBitContext gb;
00825 const ModeTab *mtab = tctx->mtab;
00826 float *out = NULL;
00827 enum FrameType ftype;
00828 int window_type, ret;
00829 static const enum FrameType wtype_to_ftype_table[] = {
00830 FT_LONG, FT_LONG, FT_SHORT, FT_LONG,
00831 FT_MEDIUM, FT_LONG, FT_LONG, FT_MEDIUM, FT_MEDIUM
00832 };
00833
00834 if (buf_size*8 < avctx->bit_rate*mtab->size/avctx->sample_rate + 8) {
00835 av_log(avctx, AV_LOG_ERROR,
00836 "Frame too small (%d bytes). Truncated file?\n", buf_size);
00837 return AVERROR(EINVAL);
00838 }
00839
00840
00841 if (tctx->discarded_packets >= 2) {
00842 tctx->frame.nb_samples = mtab->size;
00843 if ((ret = avctx->get_buffer(avctx, &tctx->frame)) < 0) {
00844 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00845 return ret;
00846 }
00847 out = (float *)tctx->frame.data[0];
00848 }
00849
00850 init_get_bits(&gb, buf, buf_size * 8);
00851 skip_bits(&gb, get_bits(&gb, 8));
00852 window_type = get_bits(&gb, WINDOW_TYPE_BITS);
00853
00854 if (window_type > 8) {
00855 av_log(avctx, AV_LOG_ERROR, "Invalid window type, broken sample?\n");
00856 return -1;
00857 }
00858
00859 ftype = wtype_to_ftype_table[window_type];
00860
00861 read_and_decode_spectrum(tctx, &gb, tctx->spectrum, ftype);
00862
00863 imdct_output(tctx, ftype, window_type, out);
00864
00865 FFSWAP(float*, tctx->curr_frame, tctx->prev_frame);
00866
00867 if (tctx->discarded_packets < 2) {
00868 tctx->discarded_packets++;
00869 *got_frame_ptr = 0;
00870 return buf_size;
00871 }
00872
00873 *got_frame_ptr = 1;
00874 *(AVFrame *)data = tctx->frame;
00875
00876 return buf_size;
00877 }
00878
00882 static av_cold int init_mdct_win(TwinContext *tctx)
00883 {
00884 int i, j, ret;
00885 const ModeTab *mtab = tctx->mtab;
00886 int size_s = mtab->size / mtab->fmode[FT_SHORT].sub;
00887 int size_m = mtab->size / mtab->fmode[FT_MEDIUM].sub;
00888 int channels = tctx->avctx->channels;
00889 float norm = channels == 1 ? 2. : 1.;
00890
00891 for (i = 0; i < 3; i++) {
00892 int bsize = tctx->mtab->size/tctx->mtab->fmode[i].sub;
00893 if ((ret = ff_mdct_init(&tctx->mdct_ctx[i], av_log2(bsize) + 1, 1,
00894 -sqrt(norm/bsize) / (1<<15))))
00895 return ret;
00896 }
00897
00898 FF_ALLOC_OR_GOTO(tctx->avctx, tctx->tmp_buf,
00899 mtab->size * sizeof(*tctx->tmp_buf), alloc_fail);
00900
00901 FF_ALLOC_OR_GOTO(tctx->avctx, tctx->spectrum,
00902 2 * mtab->size * channels * sizeof(*tctx->spectrum),
00903 alloc_fail);
00904 FF_ALLOC_OR_GOTO(tctx->avctx, tctx->curr_frame,
00905 2 * mtab->size * channels * sizeof(*tctx->curr_frame),
00906 alloc_fail);
00907 FF_ALLOC_OR_GOTO(tctx->avctx, tctx->prev_frame,
00908 2 * mtab->size * channels * sizeof(*tctx->prev_frame),
00909 alloc_fail);
00910
00911 for (i = 0; i < 3; i++) {
00912 int m = 4*mtab->size/mtab->fmode[i].sub;
00913 double freq = 2*M_PI/m;
00914 FF_ALLOC_OR_GOTO(tctx->avctx, tctx->cos_tabs[i],
00915 (m / 4) * sizeof(*tctx->cos_tabs[i]), alloc_fail);
00916
00917 for (j = 0; j <= m/8; j++)
00918 tctx->cos_tabs[i][j] = cos((2*j + 1)*freq);
00919 for (j = 1; j < m/8; j++)
00920 tctx->cos_tabs[i][m/4-j] = tctx->cos_tabs[i][j];
00921 }
00922
00923
00924 ff_init_ff_sine_windows(av_log2(size_m));
00925 ff_init_ff_sine_windows(av_log2(size_s/2));
00926 ff_init_ff_sine_windows(av_log2(mtab->size));
00927
00928 return 0;
00929 alloc_fail:
00930 return AVERROR(ENOMEM);
00931 }
00932
00939 static void permutate_in_line(int16_t *tab, int num_vect, int num_blocks,
00940 int block_size,
00941 const uint8_t line_len[2], int length_div,
00942 enum FrameType ftype)
00943
00944 {
00945 int i,j;
00946
00947 for (i = 0; i < line_len[0]; i++) {
00948 int shift;
00949
00950 if (num_blocks == 1 ||
00951 (ftype == FT_LONG && num_vect % num_blocks) ||
00952 (ftype != FT_LONG && num_vect & 1 ) ||
00953 i == line_len[1]) {
00954 shift = 0;
00955 } else if (ftype == FT_LONG) {
00956 shift = i;
00957 } else
00958 shift = i*i;
00959
00960 for (j = 0; j < num_vect && (j+num_vect*i < block_size*num_blocks); j++)
00961 tab[i*num_vect+j] = i*num_vect + (j + shift) % num_vect;
00962 }
00963 }
00964
00980 static void transpose_perm(int16_t *out, int16_t *in, int num_vect,
00981 const uint8_t line_len[2], int length_div)
00982 {
00983 int i,j;
00984 int cont= 0;
00985 for (i = 0; i < num_vect; i++)
00986 for (j = 0; j < line_len[i >= length_div]; j++)
00987 out[cont++] = in[j*num_vect + i];
00988 }
00989
00990 static void linear_perm(int16_t *out, int16_t *in, int n_blocks, int size)
00991 {
00992 int block_size = size/n_blocks;
00993 int i;
00994
00995 for (i = 0; i < size; i++)
00996 out[i] = block_size * (in[i] % n_blocks) + in[i] / n_blocks;
00997 }
00998
00999 static av_cold void construct_perm_table(TwinContext *tctx,enum FrameType ftype)
01000 {
01001 int block_size;
01002 const ModeTab *mtab = tctx->mtab;
01003 int size = tctx->avctx->channels*mtab->fmode[ftype].sub;
01004 int16_t *tmp_perm = (int16_t *) tctx->tmp_buf;
01005
01006 if (ftype == FT_PPC) {
01007 size = tctx->avctx->channels;
01008 block_size = mtab->ppc_shape_len;
01009 } else
01010 block_size = mtab->size / mtab->fmode[ftype].sub;
01011
01012 permutate_in_line(tmp_perm, tctx->n_div[ftype], size,
01013 block_size, tctx->length[ftype],
01014 tctx->length_change[ftype], ftype);
01015
01016 transpose_perm(tctx->permut[ftype], tmp_perm, tctx->n_div[ftype],
01017 tctx->length[ftype], tctx->length_change[ftype]);
01018
01019 linear_perm(tctx->permut[ftype], tctx->permut[ftype], size,
01020 size*block_size);
01021 }
01022
01023 static av_cold void init_bitstream_params(TwinContext *tctx)
01024 {
01025 const ModeTab *mtab = tctx->mtab;
01026 int n_ch = tctx->avctx->channels;
01027 int total_fr_bits = tctx->avctx->bit_rate*mtab->size/
01028 tctx->avctx->sample_rate;
01029
01030 int lsp_bits_per_block = n_ch*(mtab->lsp_bit0 + mtab->lsp_bit1 +
01031 mtab->lsp_split*mtab->lsp_bit2);
01032
01033 int ppc_bits = n_ch*(mtab->pgain_bit + mtab->ppc_shape_bit +
01034 mtab->ppc_period_bit);
01035
01036 int bsize_no_main_cb[3];
01037 int bse_bits[3];
01038 int i;
01039 enum FrameType frametype;
01040
01041 for (i = 0; i < 3; i++)
01042
01043 bse_bits[i] = n_ch *
01044 (mtab->fmode[i].bark_n_coef * mtab->fmode[i].bark_n_bit + 1);
01045
01046 bsize_no_main_cb[2] = bse_bits[2] + lsp_bits_per_block + ppc_bits +
01047 WINDOW_TYPE_BITS + n_ch*GAIN_BITS;
01048
01049 for (i = 0; i < 2; i++)
01050 bsize_no_main_cb[i] =
01051 lsp_bits_per_block + n_ch*GAIN_BITS + WINDOW_TYPE_BITS +
01052 mtab->fmode[i].sub*(bse_bits[i] + n_ch*SUB_GAIN_BITS);
01053
01054
01055 for (i = 0; i < 4; i++) {
01056 int bit_size;
01057 int vect_size;
01058 int rounded_up, rounded_down, num_rounded_down, num_rounded_up;
01059 if (i == 3) {
01060 bit_size = n_ch * mtab->ppc_shape_bit;
01061 vect_size = n_ch * mtab->ppc_shape_len;
01062 } else {
01063 bit_size = total_fr_bits - bsize_no_main_cb[i];
01064 vect_size = n_ch * mtab->size;
01065 }
01066
01067 tctx->n_div[i] = (bit_size + 13) / 14;
01068
01069 rounded_up = (bit_size + tctx->n_div[i] - 1)/tctx->n_div[i];
01070 rounded_down = (bit_size )/tctx->n_div[i];
01071 num_rounded_down = rounded_up * tctx->n_div[i] - bit_size;
01072 num_rounded_up = tctx->n_div[i] - num_rounded_down;
01073 tctx->bits_main_spec[0][i][0] = (rounded_up + 1)/2;
01074 tctx->bits_main_spec[1][i][0] = (rounded_up )/2;
01075 tctx->bits_main_spec[0][i][1] = (rounded_down + 1)/2;
01076 tctx->bits_main_spec[1][i][1] = (rounded_down )/2;
01077 tctx->bits_main_spec_change[i] = num_rounded_up;
01078
01079 rounded_up = (vect_size + tctx->n_div[i] - 1)/tctx->n_div[i];
01080 rounded_down = (vect_size )/tctx->n_div[i];
01081 num_rounded_down = rounded_up * tctx->n_div[i] - vect_size;
01082 num_rounded_up = tctx->n_div[i] - num_rounded_down;
01083 tctx->length[i][0] = rounded_up;
01084 tctx->length[i][1] = rounded_down;
01085 tctx->length_change[i] = num_rounded_up;
01086 }
01087
01088 for (frametype = FT_SHORT; frametype <= FT_PPC; frametype++)
01089 construct_perm_table(tctx, frametype);
01090 }
01091
01092 static av_cold int twin_decode_close(AVCodecContext *avctx)
01093 {
01094 TwinContext *tctx = avctx->priv_data;
01095 int i;
01096
01097 for (i = 0; i < 3; i++) {
01098 ff_mdct_end(&tctx->mdct_ctx[i]);
01099 av_free(tctx->cos_tabs[i]);
01100 }
01101
01102
01103 av_free(tctx->curr_frame);
01104 av_free(tctx->spectrum);
01105 av_free(tctx->prev_frame);
01106 av_free(tctx->tmp_buf);
01107
01108 return 0;
01109 }
01110
01111 static av_cold int twin_decode_init(AVCodecContext *avctx)
01112 {
01113 int ret;
01114 TwinContext *tctx = avctx->priv_data;
01115 int isampf, ibps;
01116
01117 tctx->avctx = avctx;
01118 avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
01119
01120 if (!avctx->extradata || avctx->extradata_size < 12) {
01121 av_log(avctx, AV_LOG_ERROR, "Missing or incomplete extradata\n");
01122 return AVERROR_INVALIDDATA;
01123 }
01124 avctx->channels = AV_RB32(avctx->extradata ) + 1;
01125 avctx->bit_rate = AV_RB32(avctx->extradata + 4) * 1000;
01126 isampf = AV_RB32(avctx->extradata + 8);
01127 switch (isampf) {
01128 case 44: avctx->sample_rate = 44100; break;
01129 case 22: avctx->sample_rate = 22050; break;
01130 case 11: avctx->sample_rate = 11025; break;
01131 default: avctx->sample_rate = isampf * 1000; break;
01132 }
01133
01134 if (avctx->channels > CHANNELS_MAX) {
01135 av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels: %i\n",
01136 avctx->channels);
01137 return -1;
01138 }
01139 ibps = avctx->bit_rate / (1000 * avctx->channels);
01140
01141 switch ((isampf << 8) + ibps) {
01142 case (8 <<8) + 8: tctx->mtab = &mode_08_08; break;
01143 case (11<<8) + 8: tctx->mtab = &mode_11_08; break;
01144 case (11<<8) + 10: tctx->mtab = &mode_11_10; break;
01145 case (16<<8) + 16: tctx->mtab = &mode_16_16; break;
01146 case (22<<8) + 20: tctx->mtab = &mode_22_20; break;
01147 case (22<<8) + 24: tctx->mtab = &mode_22_24; break;
01148 case (22<<8) + 32: tctx->mtab = &mode_22_32; break;
01149 case (44<<8) + 40: tctx->mtab = &mode_44_40; break;
01150 case (44<<8) + 48: tctx->mtab = &mode_44_48; break;
01151 default:
01152 av_log(avctx, AV_LOG_ERROR, "This version does not support %d kHz - %d kbit/s/ch mode.\n", isampf, isampf);
01153 return -1;
01154 }
01155
01156 dsputil_init(&tctx->dsp, avctx);
01157 if ((ret = init_mdct_win(tctx))) {
01158 av_log(avctx, AV_LOG_ERROR, "Error initializing MDCT\n");
01159 twin_decode_close(avctx);
01160 return ret;
01161 }
01162 init_bitstream_params(tctx);
01163
01164 memset_float(tctx->bark_hist[0][0], 0.1, FF_ARRAY_ELEMS(tctx->bark_hist));
01165
01166 avcodec_get_frame_defaults(&tctx->frame);
01167 avctx->coded_frame = &tctx->frame;
01168
01169 return 0;
01170 }
01171
01172 AVCodec ff_twinvq_decoder = {
01173 .name = "twinvq",
01174 .type = AVMEDIA_TYPE_AUDIO,
01175 .id = CODEC_ID_TWINVQ,
01176 .priv_data_size = sizeof(TwinContext),
01177 .init = twin_decode_init,
01178 .close = twin_decode_close,
01179 .decode = twin_decode_frame,
01180 .capabilities = CODEC_CAP_DR1,
01181 .long_name = NULL_IF_CONFIG_SMALL("VQF TwinVQ"),
01182 };