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00036 #include "avcodec.h"
00037 #include "wma.h"
00038
00039 #undef NDEBUG
00040 #include <assert.h>
00041
00042 #define EXPVLCBITS 8
00043 #define EXPMAX ((19+EXPVLCBITS-1)/EXPVLCBITS)
00044
00045 #define HGAINVLCBITS 9
00046 #define HGAINMAX ((13+HGAINVLCBITS-1)/HGAINVLCBITS)
00047
00048 static void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len);
00049
00050 #ifdef TRACE
00051 static void dump_shorts(WMACodecContext *s, const char *name, const short *tab, int n)
00052 {
00053 int i;
00054
00055 tprintf(s->avctx, "%s[%d]:\n", name, n);
00056 for(i=0;i<n;i++) {
00057 if ((i & 7) == 0)
00058 tprintf(s->avctx, "%4d: ", i);
00059 tprintf(s->avctx, " %5d.0", tab[i]);
00060 if ((i & 7) == 7)
00061 tprintf(s->avctx, "\n");
00062 }
00063 }
00064
00065 static void dump_floats(WMACodecContext *s, const char *name, int prec, const float *tab, int n)
00066 {
00067 int i;
00068
00069 tprintf(s->avctx, "%s[%d]:\n", name, n);
00070 for(i=0;i<n;i++) {
00071 if ((i & 7) == 0)
00072 tprintf(s->avctx, "%4d: ", i);
00073 tprintf(s->avctx, " %8.*f", prec, tab[i]);
00074 if ((i & 7) == 7)
00075 tprintf(s->avctx, "\n");
00076 }
00077 if ((i & 7) != 0)
00078 tprintf(s->avctx, "\n");
00079 }
00080 #endif
00081
00082 static int wma_decode_init(AVCodecContext * avctx)
00083 {
00084 WMACodecContext *s = avctx->priv_data;
00085 int i, flags2;
00086 uint8_t *extradata;
00087
00088 s->avctx = avctx;
00089
00090
00091 flags2 = 0;
00092 extradata = avctx->extradata;
00093 if (avctx->codec->id == CODEC_ID_WMAV1 && avctx->extradata_size >= 4) {
00094 flags2 = AV_RL16(extradata+2);
00095 } else if (avctx->codec->id == CODEC_ID_WMAV2 && avctx->extradata_size >= 6) {
00096 flags2 = AV_RL16(extradata+4);
00097 }
00098
00099
00100
00101 s->use_exp_vlc = flags2 & 0x0001;
00102 s->use_bit_reservoir = flags2 & 0x0002;
00103 s->use_variable_block_len = flags2 & 0x0004;
00104
00105 if(ff_wma_init(avctx, flags2)<0)
00106 return -1;
00107
00108
00109 for(i = 0; i < s->nb_block_sizes; i++)
00110 ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 1, 1.0);
00111
00112 if (s->use_noise_coding) {
00113 init_vlc(&s->hgain_vlc, HGAINVLCBITS, sizeof(ff_wma_hgain_huffbits),
00114 ff_wma_hgain_huffbits, 1, 1,
00115 ff_wma_hgain_huffcodes, 2, 2, 0);
00116 }
00117
00118 if (s->use_exp_vlc) {
00119 init_vlc(&s->exp_vlc, EXPVLCBITS, sizeof(ff_aac_scalefactor_bits),
00120 ff_aac_scalefactor_bits, 1, 1,
00121 ff_aac_scalefactor_code, 4, 4, 0);
00122 } else {
00123 wma_lsp_to_curve_init(s, s->frame_len);
00124 }
00125
00126 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
00127
00128 avcodec_get_frame_defaults(&s->frame);
00129 avctx->coded_frame = &s->frame;
00130
00131 return 0;
00132 }
00133
00140 static inline float pow_m1_4(WMACodecContext *s, float x)
00141 {
00142 union {
00143 float f;
00144 unsigned int v;
00145 } u, t;
00146 unsigned int e, m;
00147 float a, b;
00148
00149 u.f = x;
00150 e = u.v >> 23;
00151 m = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1);
00152
00153 t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23);
00154 a = s->lsp_pow_m_table1[m];
00155 b = s->lsp_pow_m_table2[m];
00156 return s->lsp_pow_e_table[e] * (a + b * t.f);
00157 }
00158
00159 static void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len)
00160 {
00161 float wdel, a, b;
00162 int i, e, m;
00163
00164 wdel = M_PI / frame_len;
00165 for(i=0;i<frame_len;i++)
00166 s->lsp_cos_table[i] = 2.0f * cos(wdel * i);
00167
00168
00169 for(i=0;i<256;i++) {
00170 e = i - 126;
00171 s->lsp_pow_e_table[i] = pow(2.0, e * -0.25);
00172 }
00173
00174
00175
00176 b = 1.0;
00177 for(i=(1 << LSP_POW_BITS) - 1;i>=0;i--) {
00178 m = (1 << LSP_POW_BITS) + i;
00179 a = (float)m * (0.5 / (1 << LSP_POW_BITS));
00180 a = pow(a, -0.25);
00181 s->lsp_pow_m_table1[i] = 2 * a - b;
00182 s->lsp_pow_m_table2[i] = b - a;
00183 b = a;
00184 }
00185 }
00186
00191 static void wma_lsp_to_curve(WMACodecContext *s,
00192 float *out, float *val_max_ptr,
00193 int n, float *lsp)
00194 {
00195 int i, j;
00196 float p, q, w, v, val_max;
00197
00198 val_max = 0;
00199 for(i=0;i<n;i++) {
00200 p = 0.5f;
00201 q = 0.5f;
00202 w = s->lsp_cos_table[i];
00203 for(j=1;j<NB_LSP_COEFS;j+=2){
00204 q *= w - lsp[j - 1];
00205 p *= w - lsp[j];
00206 }
00207 p *= p * (2.0f - w);
00208 q *= q * (2.0f + w);
00209 v = p + q;
00210 v = pow_m1_4(s, v);
00211 if (v > val_max)
00212 val_max = v;
00213 out[i] = v;
00214 }
00215 *val_max_ptr = val_max;
00216 }
00217
00221 static void decode_exp_lsp(WMACodecContext *s, int ch)
00222 {
00223 float lsp_coefs[NB_LSP_COEFS];
00224 int val, i;
00225
00226 for(i = 0; i < NB_LSP_COEFS; i++) {
00227 if (i == 0 || i >= 8)
00228 val = get_bits(&s->gb, 3);
00229 else
00230 val = get_bits(&s->gb, 4);
00231 lsp_coefs[i] = ff_wma_lsp_codebook[i][val];
00232 }
00233
00234 wma_lsp_to_curve(s, s->exponents[ch], &s->max_exponent[ch],
00235 s->block_len, lsp_coefs);
00236 }
00237
00239 static const float pow_tab[] = {
00240 1.7782794100389e-04, 2.0535250264571e-04,
00241 2.3713737056617e-04, 2.7384196342644e-04,
00242 3.1622776601684e-04, 3.6517412725484e-04,
00243 4.2169650342858e-04, 4.8696752516586e-04,
00244 5.6234132519035e-04, 6.4938163157621e-04,
00245 7.4989420933246e-04, 8.6596432336006e-04,
00246 1.0000000000000e-03, 1.1547819846895e-03,
00247 1.3335214321633e-03, 1.5399265260595e-03,
00248 1.7782794100389e-03, 2.0535250264571e-03,
00249 2.3713737056617e-03, 2.7384196342644e-03,
00250 3.1622776601684e-03, 3.6517412725484e-03,
00251 4.2169650342858e-03, 4.8696752516586e-03,
00252 5.6234132519035e-03, 6.4938163157621e-03,
00253 7.4989420933246e-03, 8.6596432336006e-03,
00254 1.0000000000000e-02, 1.1547819846895e-02,
00255 1.3335214321633e-02, 1.5399265260595e-02,
00256 1.7782794100389e-02, 2.0535250264571e-02,
00257 2.3713737056617e-02, 2.7384196342644e-02,
00258 3.1622776601684e-02, 3.6517412725484e-02,
00259 4.2169650342858e-02, 4.8696752516586e-02,
00260 5.6234132519035e-02, 6.4938163157621e-02,
00261 7.4989420933246e-02, 8.6596432336007e-02,
00262 1.0000000000000e-01, 1.1547819846895e-01,
00263 1.3335214321633e-01, 1.5399265260595e-01,
00264 1.7782794100389e-01, 2.0535250264571e-01,
00265 2.3713737056617e-01, 2.7384196342644e-01,
00266 3.1622776601684e-01, 3.6517412725484e-01,
00267 4.2169650342858e-01, 4.8696752516586e-01,
00268 5.6234132519035e-01, 6.4938163157621e-01,
00269 7.4989420933246e-01, 8.6596432336007e-01,
00270 1.0000000000000e+00, 1.1547819846895e+00,
00271 1.3335214321633e+00, 1.5399265260595e+00,
00272 1.7782794100389e+00, 2.0535250264571e+00,
00273 2.3713737056617e+00, 2.7384196342644e+00,
00274 3.1622776601684e+00, 3.6517412725484e+00,
00275 4.2169650342858e+00, 4.8696752516586e+00,
00276 5.6234132519035e+00, 6.4938163157621e+00,
00277 7.4989420933246e+00, 8.6596432336007e+00,
00278 1.0000000000000e+01, 1.1547819846895e+01,
00279 1.3335214321633e+01, 1.5399265260595e+01,
00280 1.7782794100389e+01, 2.0535250264571e+01,
00281 2.3713737056617e+01, 2.7384196342644e+01,
00282 3.1622776601684e+01, 3.6517412725484e+01,
00283 4.2169650342858e+01, 4.8696752516586e+01,
00284 5.6234132519035e+01, 6.4938163157621e+01,
00285 7.4989420933246e+01, 8.6596432336007e+01,
00286 1.0000000000000e+02, 1.1547819846895e+02,
00287 1.3335214321633e+02, 1.5399265260595e+02,
00288 1.7782794100389e+02, 2.0535250264571e+02,
00289 2.3713737056617e+02, 2.7384196342644e+02,
00290 3.1622776601684e+02, 3.6517412725484e+02,
00291 4.2169650342858e+02, 4.8696752516586e+02,
00292 5.6234132519035e+02, 6.4938163157621e+02,
00293 7.4989420933246e+02, 8.6596432336007e+02,
00294 1.0000000000000e+03, 1.1547819846895e+03,
00295 1.3335214321633e+03, 1.5399265260595e+03,
00296 1.7782794100389e+03, 2.0535250264571e+03,
00297 2.3713737056617e+03, 2.7384196342644e+03,
00298 3.1622776601684e+03, 3.6517412725484e+03,
00299 4.2169650342858e+03, 4.8696752516586e+03,
00300 5.6234132519035e+03, 6.4938163157621e+03,
00301 7.4989420933246e+03, 8.6596432336007e+03,
00302 1.0000000000000e+04, 1.1547819846895e+04,
00303 1.3335214321633e+04, 1.5399265260595e+04,
00304 1.7782794100389e+04, 2.0535250264571e+04,
00305 2.3713737056617e+04, 2.7384196342644e+04,
00306 3.1622776601684e+04, 3.6517412725484e+04,
00307 4.2169650342858e+04, 4.8696752516586e+04,
00308 5.6234132519035e+04, 6.4938163157621e+04,
00309 7.4989420933246e+04, 8.6596432336007e+04,
00310 1.0000000000000e+05, 1.1547819846895e+05,
00311 1.3335214321633e+05, 1.5399265260595e+05,
00312 1.7782794100389e+05, 2.0535250264571e+05,
00313 2.3713737056617e+05, 2.7384196342644e+05,
00314 3.1622776601684e+05, 3.6517412725484e+05,
00315 4.2169650342858e+05, 4.8696752516586e+05,
00316 5.6234132519035e+05, 6.4938163157621e+05,
00317 7.4989420933246e+05, 8.6596432336007e+05,
00318 };
00319
00323 static int decode_exp_vlc(WMACodecContext *s, int ch)
00324 {
00325 int last_exp, n, code;
00326 const uint16_t *ptr;
00327 float v, max_scale;
00328 uint32_t *q, *q_end, iv;
00329 const float *ptab = pow_tab + 60;
00330 const uint32_t *iptab = (const uint32_t*)ptab;
00331
00332 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
00333 q = (uint32_t *)s->exponents[ch];
00334 q_end = q + s->block_len;
00335 max_scale = 0;
00336 if (s->version == 1) {
00337 last_exp = get_bits(&s->gb, 5) + 10;
00338 v = ptab[last_exp];
00339 iv = iptab[last_exp];
00340 max_scale = v;
00341 n = *ptr++;
00342 switch (n & 3) do {
00343 case 0: *q++ = iv;
00344 case 3: *q++ = iv;
00345 case 2: *q++ = iv;
00346 case 1: *q++ = iv;
00347 } while ((n -= 4) > 0);
00348 }else
00349 last_exp = 36;
00350
00351 while (q < q_end) {
00352 code = get_vlc2(&s->gb, s->exp_vlc.table, EXPVLCBITS, EXPMAX);
00353 if (code < 0){
00354 av_log(s->avctx, AV_LOG_ERROR, "Exponent vlc invalid\n");
00355 return -1;
00356 }
00357
00358 last_exp += code - 60;
00359 if ((unsigned)last_exp + 60 >= FF_ARRAY_ELEMS(pow_tab)) {
00360 av_log(s->avctx, AV_LOG_ERROR, "Exponent out of range: %d\n",
00361 last_exp);
00362 return -1;
00363 }
00364 v = ptab[last_exp];
00365 iv = iptab[last_exp];
00366 if (v > max_scale)
00367 max_scale = v;
00368 n = *ptr++;
00369 switch (n & 3) do {
00370 case 0: *q++ = iv;
00371 case 3: *q++ = iv;
00372 case 2: *q++ = iv;
00373 case 1: *q++ = iv;
00374 } while ((n -= 4) > 0);
00375 }
00376 s->max_exponent[ch] = max_scale;
00377 return 0;
00378 }
00379
00380
00387 static void wma_window(WMACodecContext *s, float *out)
00388 {
00389 float *in = s->output;
00390 int block_len, bsize, n;
00391
00392
00393 if (s->block_len_bits <= s->prev_block_len_bits) {
00394 block_len = s->block_len;
00395 bsize = s->frame_len_bits - s->block_len_bits;
00396
00397 s->dsp.vector_fmul_add(out, in, s->windows[bsize],
00398 out, block_len);
00399
00400 } else {
00401 block_len = 1 << s->prev_block_len_bits;
00402 n = (s->block_len - block_len) / 2;
00403 bsize = s->frame_len_bits - s->prev_block_len_bits;
00404
00405 s->dsp.vector_fmul_add(out+n, in+n, s->windows[bsize],
00406 out+n, block_len);
00407
00408 memcpy(out+n+block_len, in+n+block_len, n*sizeof(float));
00409 }
00410
00411 out += s->block_len;
00412 in += s->block_len;
00413
00414
00415 if (s->block_len_bits <= s->next_block_len_bits) {
00416 block_len = s->block_len;
00417 bsize = s->frame_len_bits - s->block_len_bits;
00418
00419 s->dsp.vector_fmul_reverse(out, in, s->windows[bsize], block_len);
00420
00421 } else {
00422 block_len = 1 << s->next_block_len_bits;
00423 n = (s->block_len - block_len) / 2;
00424 bsize = s->frame_len_bits - s->next_block_len_bits;
00425
00426 memcpy(out, in, n*sizeof(float));
00427
00428 s->dsp.vector_fmul_reverse(out+n, in+n, s->windows[bsize], block_len);
00429
00430 memset(out+n+block_len, 0, n*sizeof(float));
00431 }
00432 }
00433
00434
00439 static int wma_decode_block(WMACodecContext *s)
00440 {
00441 int n, v, a, ch, bsize;
00442 int coef_nb_bits, total_gain;
00443 int nb_coefs[MAX_CHANNELS];
00444 float mdct_norm;
00445 FFTContext *mdct;
00446
00447 #ifdef TRACE
00448 tprintf(s->avctx, "***decode_block: %d:%d\n", s->frame_count - 1, s->block_num);
00449 #endif
00450
00451
00452 if (s->use_variable_block_len) {
00453 n = av_log2(s->nb_block_sizes - 1) + 1;
00454
00455 if (s->reset_block_lengths) {
00456 s->reset_block_lengths = 0;
00457 v = get_bits(&s->gb, n);
00458 if (v >= s->nb_block_sizes){
00459 av_log(s->avctx, AV_LOG_ERROR, "prev_block_len_bits %d out of range\n", s->frame_len_bits - v);
00460 return -1;
00461 }
00462 s->prev_block_len_bits = s->frame_len_bits - v;
00463 v = get_bits(&s->gb, n);
00464 if (v >= s->nb_block_sizes){
00465 av_log(s->avctx, AV_LOG_ERROR, "block_len_bits %d out of range\n", s->frame_len_bits - v);
00466 return -1;
00467 }
00468 s->block_len_bits = s->frame_len_bits - v;
00469 } else {
00470
00471 s->prev_block_len_bits = s->block_len_bits;
00472 s->block_len_bits = s->next_block_len_bits;
00473 }
00474 v = get_bits(&s->gb, n);
00475 if (v >= s->nb_block_sizes){
00476 av_log(s->avctx, AV_LOG_ERROR, "next_block_len_bits %d out of range\n", s->frame_len_bits - v);
00477 return -1;
00478 }
00479 s->next_block_len_bits = s->frame_len_bits - v;
00480 } else {
00481
00482 s->next_block_len_bits = s->frame_len_bits;
00483 s->prev_block_len_bits = s->frame_len_bits;
00484 s->block_len_bits = s->frame_len_bits;
00485 }
00486
00487
00488 s->block_len = 1 << s->block_len_bits;
00489 if ((s->block_pos + s->block_len) > s->frame_len){
00490 av_log(s->avctx, AV_LOG_ERROR, "frame_len overflow\n");
00491 return -1;
00492 }
00493
00494 if (s->nb_channels == 2) {
00495 s->ms_stereo = get_bits1(&s->gb);
00496 }
00497 v = 0;
00498 for(ch = 0; ch < s->nb_channels; ch++) {
00499 a = get_bits1(&s->gb);
00500 s->channel_coded[ch] = a;
00501 v |= a;
00502 }
00503
00504 bsize = s->frame_len_bits - s->block_len_bits;
00505
00506
00507
00508 if (!v)
00509 goto next;
00510
00511
00512
00513 total_gain = 1;
00514 for(;;) {
00515 a = get_bits(&s->gb, 7);
00516 total_gain += a;
00517 if (a != 127)
00518 break;
00519 }
00520
00521 coef_nb_bits= ff_wma_total_gain_to_bits(total_gain);
00522
00523
00524 n = s->coefs_end[bsize] - s->coefs_start;
00525 for(ch = 0; ch < s->nb_channels; ch++)
00526 nb_coefs[ch] = n;
00527
00528
00529 if (s->use_noise_coding) {
00530
00531 for(ch = 0; ch < s->nb_channels; ch++) {
00532 if (s->channel_coded[ch]) {
00533 int i, n, a;
00534 n = s->exponent_high_sizes[bsize];
00535 for(i=0;i<n;i++) {
00536 a = get_bits1(&s->gb);
00537 s->high_band_coded[ch][i] = a;
00538
00539 if (a)
00540 nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
00541 }
00542 }
00543 }
00544 for(ch = 0; ch < s->nb_channels; ch++) {
00545 if (s->channel_coded[ch]) {
00546 int i, n, val, code;
00547
00548 n = s->exponent_high_sizes[bsize];
00549 val = (int)0x80000000;
00550 for(i=0;i<n;i++) {
00551 if (s->high_band_coded[ch][i]) {
00552 if (val == (int)0x80000000) {
00553 val = get_bits(&s->gb, 7) - 19;
00554 } else {
00555 code = get_vlc2(&s->gb, s->hgain_vlc.table, HGAINVLCBITS, HGAINMAX);
00556 if (code < 0){
00557 av_log(s->avctx, AV_LOG_ERROR, "hgain vlc invalid\n");
00558 return -1;
00559 }
00560 val += code - 18;
00561 }
00562 s->high_band_values[ch][i] = val;
00563 }
00564 }
00565 }
00566 }
00567 }
00568
00569
00570 if ((s->block_len_bits == s->frame_len_bits) ||
00571 get_bits1(&s->gb)) {
00572 for(ch = 0; ch < s->nb_channels; ch++) {
00573 if (s->channel_coded[ch]) {
00574 if (s->use_exp_vlc) {
00575 if (decode_exp_vlc(s, ch) < 0)
00576 return -1;
00577 } else {
00578 decode_exp_lsp(s, ch);
00579 }
00580 s->exponents_bsize[ch] = bsize;
00581 }
00582 }
00583 }
00584
00585
00586 for(ch = 0; ch < s->nb_channels; ch++) {
00587 if (s->channel_coded[ch]) {
00588 int tindex;
00589 WMACoef* ptr = &s->coefs1[ch][0];
00590
00591
00592
00593 tindex = (ch == 1 && s->ms_stereo);
00594 memset(ptr, 0, s->block_len * sizeof(WMACoef));
00595 ff_wma_run_level_decode(s->avctx, &s->gb, &s->coef_vlc[tindex],
00596 s->level_table[tindex], s->run_table[tindex],
00597 0, ptr, 0, nb_coefs[ch],
00598 s->block_len, s->frame_len_bits, coef_nb_bits);
00599 }
00600 if (s->version == 1 && s->nb_channels >= 2) {
00601 align_get_bits(&s->gb);
00602 }
00603 }
00604
00605
00606 {
00607 int n4 = s->block_len / 2;
00608 mdct_norm = 1.0 / (float)n4;
00609 if (s->version == 1) {
00610 mdct_norm *= sqrt(n4);
00611 }
00612 }
00613
00614
00615 for(ch = 0; ch < s->nb_channels; ch++) {
00616 if (s->channel_coded[ch]) {
00617 WMACoef *coefs1;
00618 float *coefs, *exponents, mult, mult1, noise;
00619 int i, j, n, n1, last_high_band, esize;
00620 float exp_power[HIGH_BAND_MAX_SIZE];
00621
00622 coefs1 = s->coefs1[ch];
00623 exponents = s->exponents[ch];
00624 esize = s->exponents_bsize[ch];
00625 mult = pow(10, total_gain * 0.05) / s->max_exponent[ch];
00626 mult *= mdct_norm;
00627 coefs = s->coefs[ch];
00628 if (s->use_noise_coding) {
00629 mult1 = mult;
00630
00631 for(i = 0;i < s->coefs_start; i++) {
00632 *coefs++ = s->noise_table[s->noise_index] *
00633 exponents[i<<bsize>>esize] * mult1;
00634 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
00635 }
00636
00637 n1 = s->exponent_high_sizes[bsize];
00638
00639
00640 exponents = s->exponents[ch] +
00641 (s->high_band_start[bsize]<<bsize>>esize);
00642 last_high_band = 0;
00643 for(j=0;j<n1;j++) {
00644 n = s->exponent_high_bands[s->frame_len_bits -
00645 s->block_len_bits][j];
00646 if (s->high_band_coded[ch][j]) {
00647 float e2, v;
00648 e2 = 0;
00649 for(i = 0;i < n; i++) {
00650 v = exponents[i<<bsize>>esize];
00651 e2 += v * v;
00652 }
00653 exp_power[j] = e2 / n;
00654 last_high_band = j;
00655 tprintf(s->avctx, "%d: power=%f (%d)\n", j, exp_power[j], n);
00656 }
00657 exponents += n<<bsize>>esize;
00658 }
00659
00660
00661 exponents = s->exponents[ch] + (s->coefs_start<<bsize>>esize);
00662 for(j=-1;j<n1;j++) {
00663 if (j < 0) {
00664 n = s->high_band_start[bsize] -
00665 s->coefs_start;
00666 } else {
00667 n = s->exponent_high_bands[s->frame_len_bits -
00668 s->block_len_bits][j];
00669 }
00670 if (j >= 0 && s->high_band_coded[ch][j]) {
00671
00672 mult1 = sqrt(exp_power[j] / exp_power[last_high_band]);
00673
00674 mult1 = mult1 * pow(10, s->high_band_values[ch][j] * 0.05);
00675 mult1 = mult1 / (s->max_exponent[ch] * s->noise_mult);
00676 mult1 *= mdct_norm;
00677 for(i = 0;i < n; i++) {
00678 noise = s->noise_table[s->noise_index];
00679 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
00680 *coefs++ = noise *
00681 exponents[i<<bsize>>esize] * mult1;
00682 }
00683 exponents += n<<bsize>>esize;
00684 } else {
00685
00686 for(i = 0;i < n; i++) {
00687 noise = s->noise_table[s->noise_index];
00688 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
00689 *coefs++ = ((*coefs1++) + noise) *
00690 exponents[i<<bsize>>esize] * mult;
00691 }
00692 exponents += n<<bsize>>esize;
00693 }
00694 }
00695
00696
00697 n = s->block_len - s->coefs_end[bsize];
00698 mult1 = mult * exponents[((-1<<bsize))>>esize];
00699 for(i = 0; i < n; i++) {
00700 *coefs++ = s->noise_table[s->noise_index] * mult1;
00701 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
00702 }
00703 } else {
00704
00705 for(i = 0;i < s->coefs_start; i++)
00706 *coefs++ = 0.0;
00707 n = nb_coefs[ch];
00708 for(i = 0;i < n; i++) {
00709 *coefs++ = coefs1[i] * exponents[i<<bsize>>esize] * mult;
00710 }
00711 n = s->block_len - s->coefs_end[bsize];
00712 for(i = 0;i < n; i++)
00713 *coefs++ = 0.0;
00714 }
00715 }
00716 }
00717
00718 #ifdef TRACE
00719 for(ch = 0; ch < s->nb_channels; ch++) {
00720 if (s->channel_coded[ch]) {
00721 dump_floats(s, "exponents", 3, s->exponents[ch], s->block_len);
00722 dump_floats(s, "coefs", 1, s->coefs[ch], s->block_len);
00723 }
00724 }
00725 #endif
00726
00727 if (s->ms_stereo && s->channel_coded[1]) {
00728
00729
00730
00731 if (!s->channel_coded[0]) {
00732 tprintf(s->avctx, "rare ms-stereo case happened\n");
00733 memset(s->coefs[0], 0, sizeof(float) * s->block_len);
00734 s->channel_coded[0] = 1;
00735 }
00736
00737 s->dsp.butterflies_float(s->coefs[0], s->coefs[1], s->block_len);
00738 }
00739
00740 next:
00741 mdct = &s->mdct_ctx[bsize];
00742
00743 for(ch = 0; ch < s->nb_channels; ch++) {
00744 int n4, index;
00745
00746 n4 = s->block_len / 2;
00747 if(s->channel_coded[ch]){
00748 mdct->imdct_calc(mdct, s->output, s->coefs[ch]);
00749 }else if(!(s->ms_stereo && ch==1))
00750 memset(s->output, 0, sizeof(s->output));
00751
00752
00753 index = (s->frame_len / 2) + s->block_pos - n4;
00754 wma_window(s, &s->frame_out[ch][index]);
00755 }
00756
00757
00758 s->block_num++;
00759 s->block_pos += s->block_len;
00760 if (s->block_pos >= s->frame_len)
00761 return 1;
00762 else
00763 return 0;
00764 }
00765
00766
00767 static int wma_decode_frame(WMACodecContext *s, int16_t *samples)
00768 {
00769 int ret, n, ch, incr;
00770 const float *output[MAX_CHANNELS];
00771
00772 #ifdef TRACE
00773 tprintf(s->avctx, "***decode_frame: %d size=%d\n", s->frame_count++, s->frame_len);
00774 #endif
00775
00776
00777 s->block_num = 0;
00778 s->block_pos = 0;
00779 for(;;) {
00780 ret = wma_decode_block(s);
00781 if (ret < 0)
00782 return -1;
00783 if (ret)
00784 break;
00785 }
00786
00787
00788 n = s->frame_len;
00789 incr = s->nb_channels;
00790 for (ch = 0; ch < MAX_CHANNELS; ch++)
00791 output[ch] = s->frame_out[ch];
00792 s->fmt_conv.float_to_int16_interleave(samples, output, n, incr);
00793 for (ch = 0; ch < incr; ch++) {
00794
00795 memmove(&s->frame_out[ch][0], &s->frame_out[ch][n], n * sizeof(float));
00796 }
00797
00798 #ifdef TRACE
00799 dump_shorts(s, "samples", samples, n * s->nb_channels);
00800 #endif
00801 return 0;
00802 }
00803
00804 static int wma_decode_superframe(AVCodecContext *avctx, void *data,
00805 int *got_frame_ptr, AVPacket *avpkt)
00806 {
00807 const uint8_t *buf = avpkt->data;
00808 int buf_size = avpkt->size;
00809 WMACodecContext *s = avctx->priv_data;
00810 int nb_frames, bit_offset, i, pos, len, ret;
00811 uint8_t *q;
00812 int16_t *samples;
00813
00814 tprintf(avctx, "***decode_superframe:\n");
00815
00816 if(buf_size==0){
00817 s->last_superframe_len = 0;
00818 return 0;
00819 }
00820 if (buf_size < s->block_align) {
00821 av_log(avctx, AV_LOG_ERROR,
00822 "Input packet size too small (%d < %d)\n",
00823 buf_size, s->block_align);
00824 return AVERROR_INVALIDDATA;
00825 }
00826 buf_size = s->block_align;
00827
00828 init_get_bits(&s->gb, buf, buf_size*8);
00829
00830 if (s->use_bit_reservoir) {
00831
00832 skip_bits(&s->gb, 4);
00833 nb_frames = get_bits(&s->gb, 4) - (s->last_superframe_len <= 0);
00834 } else {
00835 nb_frames = 1;
00836 }
00837
00838
00839 s->frame.nb_samples = nb_frames * s->frame_len;
00840 if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
00841 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00842 return ret;
00843 }
00844 samples = (int16_t *)s->frame.data[0];
00845
00846 if (s->use_bit_reservoir) {
00847 bit_offset = get_bits(&s->gb, s->byte_offset_bits + 3);
00848 if (bit_offset > get_bits_left(&s->gb)) {
00849 av_log(avctx, AV_LOG_ERROR,
00850 "Invalid last frame bit offset %d > buf size %d (%d)\n",
00851 bit_offset, get_bits_left(&s->gb), buf_size);
00852 goto fail;
00853 }
00854
00855 if (s->last_superframe_len > 0) {
00856
00857
00858 if ((s->last_superframe_len + ((bit_offset + 7) >> 3)) >
00859 MAX_CODED_SUPERFRAME_SIZE)
00860 goto fail;
00861 q = s->last_superframe + s->last_superframe_len;
00862 len = bit_offset;
00863 while (len > 7) {
00864 *q++ = (get_bits)(&s->gb, 8);
00865 len -= 8;
00866 }
00867 if (len > 0) {
00868 *q++ = (get_bits)(&s->gb, len) << (8 - len);
00869 }
00870 memset(q, 0, FF_INPUT_BUFFER_PADDING_SIZE);
00871
00872
00873 init_get_bits(&s->gb, s->last_superframe, s->last_superframe_len * 8 + bit_offset);
00874
00875 if (s->last_bitoffset > 0)
00876 skip_bits(&s->gb, s->last_bitoffset);
00877
00878
00879 if (wma_decode_frame(s, samples) < 0)
00880 goto fail;
00881 samples += s->nb_channels * s->frame_len;
00882 nb_frames--;
00883 }
00884
00885
00886 pos = bit_offset + 4 + 4 + s->byte_offset_bits + 3;
00887 if (pos >= MAX_CODED_SUPERFRAME_SIZE * 8 || pos > buf_size * 8)
00888 return AVERROR_INVALIDDATA;
00889 init_get_bits(&s->gb, buf + (pos >> 3), (buf_size - (pos >> 3))*8);
00890 len = pos & 7;
00891 if (len > 0)
00892 skip_bits(&s->gb, len);
00893
00894 s->reset_block_lengths = 1;
00895 for(i=0;i<nb_frames;i++) {
00896 if (wma_decode_frame(s, samples) < 0)
00897 goto fail;
00898 samples += s->nb_channels * s->frame_len;
00899 }
00900
00901
00902 pos = get_bits_count(&s->gb) + ((bit_offset + 4 + 4 + s->byte_offset_bits + 3) & ~7);
00903 s->last_bitoffset = pos & 7;
00904 pos >>= 3;
00905 len = buf_size - pos;
00906 if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0) {
00907 av_log(s->avctx, AV_LOG_ERROR, "len %d invalid\n", len);
00908 goto fail;
00909 }
00910 s->last_superframe_len = len;
00911 memcpy(s->last_superframe, buf + pos, len);
00912 } else {
00913
00914 if (wma_decode_frame(s, samples) < 0)
00915 goto fail;
00916 samples += s->nb_channels * s->frame_len;
00917 }
00918
00919
00920
00921 *got_frame_ptr = 1;
00922 *(AVFrame *)data = s->frame;
00923
00924 return s->block_align;
00925 fail:
00926
00927 s->last_superframe_len = 0;
00928 return -1;
00929 }
00930
00931 static av_cold void flush(AVCodecContext *avctx)
00932 {
00933 WMACodecContext *s = avctx->priv_data;
00934
00935 s->last_bitoffset=
00936 s->last_superframe_len= 0;
00937 }
00938
00939 AVCodec ff_wmav1_decoder = {
00940 .name = "wmav1",
00941 .type = AVMEDIA_TYPE_AUDIO,
00942 .id = CODEC_ID_WMAV1,
00943 .priv_data_size = sizeof(WMACodecContext),
00944 .init = wma_decode_init,
00945 .close = ff_wma_end,
00946 .decode = wma_decode_superframe,
00947 .flush = flush,
00948 .capabilities = CODEC_CAP_DR1,
00949 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
00950 };
00951
00952 AVCodec ff_wmav2_decoder = {
00953 .name = "wmav2",
00954 .type = AVMEDIA_TYPE_AUDIO,
00955 .id = CODEC_ID_WMAV2,
00956 .priv_data_size = sizeof(WMACodecContext),
00957 .init = wma_decode_init,
00958 .close = ff_wma_end,
00959 .decode = wma_decode_superframe,
00960 .flush = flush,
00961 .capabilities = CODEC_CAP_DR1,
00962 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),
00963 };