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00036 #include "avcodec.h"
00037 #include "internal.h"
00038 #include "wma.h"
00039
00040 #undef NDEBUG
00041 #include <assert.h>
00042
00043 #define EXPVLCBITS 8
00044 #define EXPMAX ((19+EXPVLCBITS-1)/EXPVLCBITS)
00045
00046 #define HGAINVLCBITS 9
00047 #define HGAINMAX ((13+HGAINVLCBITS-1)/HGAINVLCBITS)
00048
00049 static void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len);
00050
00051 #ifdef TRACE
00052 static void dump_shorts(WMACodecContext *s, const char *name, const short *tab, int n)
00053 {
00054 int i;
00055
00056 tprintf(s->avctx, "%s[%d]:\n", name, n);
00057 for(i=0;i<n;i++) {
00058 if ((i & 7) == 0)
00059 tprintf(s->avctx, "%4d: ", i);
00060 tprintf(s->avctx, " %5d.0", tab[i]);
00061 if ((i & 7) == 7)
00062 tprintf(s->avctx, "\n");
00063 }
00064 }
00065
00066 static void dump_floats(WMACodecContext *s, const char *name, int prec, const float *tab, int n)
00067 {
00068 int i;
00069
00070 tprintf(s->avctx, "%s[%d]:\n", name, n);
00071 for(i=0;i<n;i++) {
00072 if ((i & 7) == 0)
00073 tprintf(s->avctx, "%4d: ", i);
00074 tprintf(s->avctx, " %8.*f", prec, tab[i]);
00075 if ((i & 7) == 7)
00076 tprintf(s->avctx, "\n");
00077 }
00078 if ((i & 7) != 0)
00079 tprintf(s->avctx, "\n");
00080 }
00081 #endif
00082
00083 static int wma_decode_init(AVCodecContext * avctx)
00084 {
00085 WMACodecContext *s = avctx->priv_data;
00086 int i, flags2;
00087 uint8_t *extradata;
00088
00089 if (!avctx->block_align) {
00090 av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
00091 return AVERROR(EINVAL);
00092 }
00093
00094 s->avctx = avctx;
00095
00096
00097 flags2 = 0;
00098 extradata = avctx->extradata;
00099 if (avctx->codec->id == CODEC_ID_WMAV1 && avctx->extradata_size >= 4) {
00100 flags2 = AV_RL16(extradata+2);
00101 } else if (avctx->codec->id == CODEC_ID_WMAV2 && avctx->extradata_size >= 6) {
00102 flags2 = AV_RL16(extradata+4);
00103 }
00104
00105
00106
00107 s->use_exp_vlc = flags2 & 0x0001;
00108 s->use_bit_reservoir = flags2 & 0x0002;
00109 s->use_variable_block_len = flags2 & 0x0004;
00110
00111 if(ff_wma_init(avctx, flags2)<0)
00112 return -1;
00113
00114
00115 for(i = 0; i < s->nb_block_sizes; i++)
00116 ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 1, 1.0);
00117
00118 if (s->use_noise_coding) {
00119 init_vlc(&s->hgain_vlc, HGAINVLCBITS, sizeof(ff_wma_hgain_huffbits),
00120 ff_wma_hgain_huffbits, 1, 1,
00121 ff_wma_hgain_huffcodes, 2, 2, 0);
00122 }
00123
00124 if (s->use_exp_vlc) {
00125 init_vlc(&s->exp_vlc, EXPVLCBITS, sizeof(ff_aac_scalefactor_bits),
00126 ff_aac_scalefactor_bits, 1, 1,
00127 ff_aac_scalefactor_code, 4, 4, 0);
00128 } else {
00129 wma_lsp_to_curve_init(s, s->frame_len);
00130 }
00131
00132 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
00133
00134 avcodec_get_frame_defaults(&s->frame);
00135 avctx->coded_frame = &s->frame;
00136
00137 return 0;
00138 }
00139
00146 static inline float pow_m1_4(WMACodecContext *s, float x)
00147 {
00148 union {
00149 float f;
00150 unsigned int v;
00151 } u, t;
00152 unsigned int e, m;
00153 float a, b;
00154
00155 u.f = x;
00156 e = u.v >> 23;
00157 m = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1);
00158
00159 t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23);
00160 a = s->lsp_pow_m_table1[m];
00161 b = s->lsp_pow_m_table2[m];
00162 return s->lsp_pow_e_table[e] * (a + b * t.f);
00163 }
00164
00165 static void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len)
00166 {
00167 float wdel, a, b;
00168 int i, e, m;
00169
00170 wdel = M_PI / frame_len;
00171 for(i=0;i<frame_len;i++)
00172 s->lsp_cos_table[i] = 2.0f * cos(wdel * i);
00173
00174
00175 for(i=0;i<256;i++) {
00176 e = i - 126;
00177 s->lsp_pow_e_table[i] = pow(2.0, e * -0.25);
00178 }
00179
00180
00181
00182 b = 1.0;
00183 for(i=(1 << LSP_POW_BITS) - 1;i>=0;i--) {
00184 m = (1 << LSP_POW_BITS) + i;
00185 a = (float)m * (0.5 / (1 << LSP_POW_BITS));
00186 a = pow(a, -0.25);
00187 s->lsp_pow_m_table1[i] = 2 * a - b;
00188 s->lsp_pow_m_table2[i] = b - a;
00189 b = a;
00190 }
00191 }
00192
00197 static void wma_lsp_to_curve(WMACodecContext *s,
00198 float *out, float *val_max_ptr,
00199 int n, float *lsp)
00200 {
00201 int i, j;
00202 float p, q, w, v, val_max;
00203
00204 val_max = 0;
00205 for(i=0;i<n;i++) {
00206 p = 0.5f;
00207 q = 0.5f;
00208 w = s->lsp_cos_table[i];
00209 for(j=1;j<NB_LSP_COEFS;j+=2){
00210 q *= w - lsp[j - 1];
00211 p *= w - lsp[j];
00212 }
00213 p *= p * (2.0f - w);
00214 q *= q * (2.0f + w);
00215 v = p + q;
00216 v = pow_m1_4(s, v);
00217 if (v > val_max)
00218 val_max = v;
00219 out[i] = v;
00220 }
00221 *val_max_ptr = val_max;
00222 }
00223
00227 static void decode_exp_lsp(WMACodecContext *s, int ch)
00228 {
00229 float lsp_coefs[NB_LSP_COEFS];
00230 int val, i;
00231
00232 for(i = 0; i < NB_LSP_COEFS; i++) {
00233 if (i == 0 || i >= 8)
00234 val = get_bits(&s->gb, 3);
00235 else
00236 val = get_bits(&s->gb, 4);
00237 lsp_coefs[i] = ff_wma_lsp_codebook[i][val];
00238 }
00239
00240 wma_lsp_to_curve(s, s->exponents[ch], &s->max_exponent[ch],
00241 s->block_len, lsp_coefs);
00242 }
00243
00245 static const float pow_tab[] = {
00246 1.7782794100389e-04, 2.0535250264571e-04,
00247 2.3713737056617e-04, 2.7384196342644e-04,
00248 3.1622776601684e-04, 3.6517412725484e-04,
00249 4.2169650342858e-04, 4.8696752516586e-04,
00250 5.6234132519035e-04, 6.4938163157621e-04,
00251 7.4989420933246e-04, 8.6596432336006e-04,
00252 1.0000000000000e-03, 1.1547819846895e-03,
00253 1.3335214321633e-03, 1.5399265260595e-03,
00254 1.7782794100389e-03, 2.0535250264571e-03,
00255 2.3713737056617e-03, 2.7384196342644e-03,
00256 3.1622776601684e-03, 3.6517412725484e-03,
00257 4.2169650342858e-03, 4.8696752516586e-03,
00258 5.6234132519035e-03, 6.4938163157621e-03,
00259 7.4989420933246e-03, 8.6596432336006e-03,
00260 1.0000000000000e-02, 1.1547819846895e-02,
00261 1.3335214321633e-02, 1.5399265260595e-02,
00262 1.7782794100389e-02, 2.0535250264571e-02,
00263 2.3713737056617e-02, 2.7384196342644e-02,
00264 3.1622776601684e-02, 3.6517412725484e-02,
00265 4.2169650342858e-02, 4.8696752516586e-02,
00266 5.6234132519035e-02, 6.4938163157621e-02,
00267 7.4989420933246e-02, 8.6596432336007e-02,
00268 1.0000000000000e-01, 1.1547819846895e-01,
00269 1.3335214321633e-01, 1.5399265260595e-01,
00270 1.7782794100389e-01, 2.0535250264571e-01,
00271 2.3713737056617e-01, 2.7384196342644e-01,
00272 3.1622776601684e-01, 3.6517412725484e-01,
00273 4.2169650342858e-01, 4.8696752516586e-01,
00274 5.6234132519035e-01, 6.4938163157621e-01,
00275 7.4989420933246e-01, 8.6596432336007e-01,
00276 1.0000000000000e+00, 1.1547819846895e+00,
00277 1.3335214321633e+00, 1.5399265260595e+00,
00278 1.7782794100389e+00, 2.0535250264571e+00,
00279 2.3713737056617e+00, 2.7384196342644e+00,
00280 3.1622776601684e+00, 3.6517412725484e+00,
00281 4.2169650342858e+00, 4.8696752516586e+00,
00282 5.6234132519035e+00, 6.4938163157621e+00,
00283 7.4989420933246e+00, 8.6596432336007e+00,
00284 1.0000000000000e+01, 1.1547819846895e+01,
00285 1.3335214321633e+01, 1.5399265260595e+01,
00286 1.7782794100389e+01, 2.0535250264571e+01,
00287 2.3713737056617e+01, 2.7384196342644e+01,
00288 3.1622776601684e+01, 3.6517412725484e+01,
00289 4.2169650342858e+01, 4.8696752516586e+01,
00290 5.6234132519035e+01, 6.4938163157621e+01,
00291 7.4989420933246e+01, 8.6596432336007e+01,
00292 1.0000000000000e+02, 1.1547819846895e+02,
00293 1.3335214321633e+02, 1.5399265260595e+02,
00294 1.7782794100389e+02, 2.0535250264571e+02,
00295 2.3713737056617e+02, 2.7384196342644e+02,
00296 3.1622776601684e+02, 3.6517412725484e+02,
00297 4.2169650342858e+02, 4.8696752516586e+02,
00298 5.6234132519035e+02, 6.4938163157621e+02,
00299 7.4989420933246e+02, 8.6596432336007e+02,
00300 1.0000000000000e+03, 1.1547819846895e+03,
00301 1.3335214321633e+03, 1.5399265260595e+03,
00302 1.7782794100389e+03, 2.0535250264571e+03,
00303 2.3713737056617e+03, 2.7384196342644e+03,
00304 3.1622776601684e+03, 3.6517412725484e+03,
00305 4.2169650342858e+03, 4.8696752516586e+03,
00306 5.6234132519035e+03, 6.4938163157621e+03,
00307 7.4989420933246e+03, 8.6596432336007e+03,
00308 1.0000000000000e+04, 1.1547819846895e+04,
00309 1.3335214321633e+04, 1.5399265260595e+04,
00310 1.7782794100389e+04, 2.0535250264571e+04,
00311 2.3713737056617e+04, 2.7384196342644e+04,
00312 3.1622776601684e+04, 3.6517412725484e+04,
00313 4.2169650342858e+04, 4.8696752516586e+04,
00314 5.6234132519035e+04, 6.4938163157621e+04,
00315 7.4989420933246e+04, 8.6596432336007e+04,
00316 1.0000000000000e+05, 1.1547819846895e+05,
00317 1.3335214321633e+05, 1.5399265260595e+05,
00318 1.7782794100389e+05, 2.0535250264571e+05,
00319 2.3713737056617e+05, 2.7384196342644e+05,
00320 3.1622776601684e+05, 3.6517412725484e+05,
00321 4.2169650342858e+05, 4.8696752516586e+05,
00322 5.6234132519035e+05, 6.4938163157621e+05,
00323 7.4989420933246e+05, 8.6596432336007e+05,
00324 };
00325
00329 static int decode_exp_vlc(WMACodecContext *s, int ch)
00330 {
00331 int last_exp, n, code;
00332 const uint16_t *ptr;
00333 float v, max_scale;
00334 uint32_t *q, *q_end, iv;
00335 const float *ptab = pow_tab + 60;
00336 const uint32_t *iptab = (const uint32_t*)ptab;
00337
00338 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
00339 q = (uint32_t *)s->exponents[ch];
00340 q_end = q + s->block_len;
00341 max_scale = 0;
00342 if (s->version == 1) {
00343 last_exp = get_bits(&s->gb, 5) + 10;
00344 v = ptab[last_exp];
00345 iv = iptab[last_exp];
00346 max_scale = v;
00347 n = *ptr++;
00348 switch (n & 3) do {
00349 case 0: *q++ = iv;
00350 case 3: *q++ = iv;
00351 case 2: *q++ = iv;
00352 case 1: *q++ = iv;
00353 } while ((n -= 4) > 0);
00354 }else
00355 last_exp = 36;
00356
00357 while (q < q_end) {
00358 code = get_vlc2(&s->gb, s->exp_vlc.table, EXPVLCBITS, EXPMAX);
00359 if (code < 0){
00360 av_log(s->avctx, AV_LOG_ERROR, "Exponent vlc invalid\n");
00361 return -1;
00362 }
00363
00364 last_exp += code - 60;
00365 if ((unsigned)last_exp + 60 >= FF_ARRAY_ELEMS(pow_tab)) {
00366 av_log(s->avctx, AV_LOG_ERROR, "Exponent out of range: %d\n",
00367 last_exp);
00368 return -1;
00369 }
00370 v = ptab[last_exp];
00371 iv = iptab[last_exp];
00372 if (v > max_scale)
00373 max_scale = v;
00374 n = *ptr++;
00375 switch (n & 3) do {
00376 case 0: *q++ = iv;
00377 case 3: *q++ = iv;
00378 case 2: *q++ = iv;
00379 case 1: *q++ = iv;
00380 } while ((n -= 4) > 0);
00381 }
00382 s->max_exponent[ch] = max_scale;
00383 return 0;
00384 }
00385
00386
00393 static void wma_window(WMACodecContext *s, float *out)
00394 {
00395 float *in = s->output;
00396 int block_len, bsize, n;
00397
00398
00399 if (s->block_len_bits <= s->prev_block_len_bits) {
00400 block_len = s->block_len;
00401 bsize = s->frame_len_bits - s->block_len_bits;
00402
00403 s->dsp.vector_fmul_add(out, in, s->windows[bsize],
00404 out, block_len);
00405
00406 } else {
00407 block_len = 1 << s->prev_block_len_bits;
00408 n = (s->block_len - block_len) / 2;
00409 bsize = s->frame_len_bits - s->prev_block_len_bits;
00410
00411 s->dsp.vector_fmul_add(out+n, in+n, s->windows[bsize],
00412 out+n, block_len);
00413
00414 memcpy(out+n+block_len, in+n+block_len, n*sizeof(float));
00415 }
00416
00417 out += s->block_len;
00418 in += s->block_len;
00419
00420
00421 if (s->block_len_bits <= s->next_block_len_bits) {
00422 block_len = s->block_len;
00423 bsize = s->frame_len_bits - s->block_len_bits;
00424
00425 s->dsp.vector_fmul_reverse(out, in, s->windows[bsize], block_len);
00426
00427 } else {
00428 block_len = 1 << s->next_block_len_bits;
00429 n = (s->block_len - block_len) / 2;
00430 bsize = s->frame_len_bits - s->next_block_len_bits;
00431
00432 memcpy(out, in, n*sizeof(float));
00433
00434 s->dsp.vector_fmul_reverse(out+n, in+n, s->windows[bsize], block_len);
00435
00436 memset(out+n+block_len, 0, n*sizeof(float));
00437 }
00438 }
00439
00440
00445 static int wma_decode_block(WMACodecContext *s)
00446 {
00447 int n, v, a, ch, bsize;
00448 int coef_nb_bits, total_gain;
00449 int nb_coefs[MAX_CHANNELS];
00450 float mdct_norm;
00451 FFTContext *mdct;
00452
00453 #ifdef TRACE
00454 tprintf(s->avctx, "***decode_block: %d:%d\n", s->frame_count - 1, s->block_num);
00455 #endif
00456
00457
00458 if (s->use_variable_block_len) {
00459 n = av_log2(s->nb_block_sizes - 1) + 1;
00460
00461 if (s->reset_block_lengths) {
00462 s->reset_block_lengths = 0;
00463 v = get_bits(&s->gb, n);
00464 if (v >= s->nb_block_sizes){
00465 av_log(s->avctx, AV_LOG_ERROR, "prev_block_len_bits %d out of range\n", s->frame_len_bits - v);
00466 return -1;
00467 }
00468 s->prev_block_len_bits = s->frame_len_bits - v;
00469 v = get_bits(&s->gb, n);
00470 if (v >= s->nb_block_sizes){
00471 av_log(s->avctx, AV_LOG_ERROR, "block_len_bits %d out of range\n", s->frame_len_bits - v);
00472 return -1;
00473 }
00474 s->block_len_bits = s->frame_len_bits - v;
00475 } else {
00476
00477 s->prev_block_len_bits = s->block_len_bits;
00478 s->block_len_bits = s->next_block_len_bits;
00479 }
00480 v = get_bits(&s->gb, n);
00481 if (v >= s->nb_block_sizes){
00482 av_log(s->avctx, AV_LOG_ERROR, "next_block_len_bits %d out of range\n", s->frame_len_bits - v);
00483 return -1;
00484 }
00485 s->next_block_len_bits = s->frame_len_bits - v;
00486 } else {
00487
00488 s->next_block_len_bits = s->frame_len_bits;
00489 s->prev_block_len_bits = s->frame_len_bits;
00490 s->block_len_bits = s->frame_len_bits;
00491 }
00492
00493
00494 s->block_len = 1 << s->block_len_bits;
00495 if ((s->block_pos + s->block_len) > s->frame_len){
00496 av_log(s->avctx, AV_LOG_ERROR, "frame_len overflow\n");
00497 return -1;
00498 }
00499
00500 if (s->nb_channels == 2) {
00501 s->ms_stereo = get_bits1(&s->gb);
00502 }
00503 v = 0;
00504 for(ch = 0; ch < s->nb_channels; ch++) {
00505 a = get_bits1(&s->gb);
00506 s->channel_coded[ch] = a;
00507 v |= a;
00508 }
00509
00510 bsize = s->frame_len_bits - s->block_len_bits;
00511
00512
00513
00514 if (!v)
00515 goto next;
00516
00517
00518
00519 total_gain = 1;
00520 for(;;) {
00521 a = get_bits(&s->gb, 7);
00522 total_gain += a;
00523 if (a != 127)
00524 break;
00525 }
00526
00527 coef_nb_bits= ff_wma_total_gain_to_bits(total_gain);
00528
00529
00530 n = s->coefs_end[bsize] - s->coefs_start;
00531 for(ch = 0; ch < s->nb_channels; ch++)
00532 nb_coefs[ch] = n;
00533
00534
00535 if (s->use_noise_coding) {
00536
00537 for(ch = 0; ch < s->nb_channels; ch++) {
00538 if (s->channel_coded[ch]) {
00539 int i, n, a;
00540 n = s->exponent_high_sizes[bsize];
00541 for(i=0;i<n;i++) {
00542 a = get_bits1(&s->gb);
00543 s->high_band_coded[ch][i] = a;
00544
00545 if (a)
00546 nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
00547 }
00548 }
00549 }
00550 for(ch = 0; ch < s->nb_channels; ch++) {
00551 if (s->channel_coded[ch]) {
00552 int i, n, val, code;
00553
00554 n = s->exponent_high_sizes[bsize];
00555 val = (int)0x80000000;
00556 for(i=0;i<n;i++) {
00557 if (s->high_band_coded[ch][i]) {
00558 if (val == (int)0x80000000) {
00559 val = get_bits(&s->gb, 7) - 19;
00560 } else {
00561 code = get_vlc2(&s->gb, s->hgain_vlc.table, HGAINVLCBITS, HGAINMAX);
00562 if (code < 0){
00563 av_log(s->avctx, AV_LOG_ERROR, "hgain vlc invalid\n");
00564 return -1;
00565 }
00566 val += code - 18;
00567 }
00568 s->high_band_values[ch][i] = val;
00569 }
00570 }
00571 }
00572 }
00573 }
00574
00575
00576 if ((s->block_len_bits == s->frame_len_bits) ||
00577 get_bits1(&s->gb)) {
00578 for(ch = 0; ch < s->nb_channels; ch++) {
00579 if (s->channel_coded[ch]) {
00580 if (s->use_exp_vlc) {
00581 if (decode_exp_vlc(s, ch) < 0)
00582 return -1;
00583 } else {
00584 decode_exp_lsp(s, ch);
00585 }
00586 s->exponents_bsize[ch] = bsize;
00587 }
00588 }
00589 }
00590
00591
00592 for(ch = 0; ch < s->nb_channels; ch++) {
00593 if (s->channel_coded[ch]) {
00594 int tindex;
00595 WMACoef* ptr = &s->coefs1[ch][0];
00596
00597
00598
00599 tindex = (ch == 1 && s->ms_stereo);
00600 memset(ptr, 0, s->block_len * sizeof(WMACoef));
00601 ff_wma_run_level_decode(s->avctx, &s->gb, &s->coef_vlc[tindex],
00602 s->level_table[tindex], s->run_table[tindex],
00603 0, ptr, 0, nb_coefs[ch],
00604 s->block_len, s->frame_len_bits, coef_nb_bits);
00605 }
00606 if (s->version == 1 && s->nb_channels >= 2) {
00607 align_get_bits(&s->gb);
00608 }
00609 }
00610
00611
00612 {
00613 int n4 = s->block_len / 2;
00614 mdct_norm = 1.0 / (float)n4;
00615 if (s->version == 1) {
00616 mdct_norm *= sqrt(n4);
00617 }
00618 }
00619
00620
00621 for(ch = 0; ch < s->nb_channels; ch++) {
00622 if (s->channel_coded[ch]) {
00623 WMACoef *coefs1;
00624 float *coefs, *exponents, mult, mult1, noise;
00625 int i, j, n, n1, last_high_band, esize;
00626 float exp_power[HIGH_BAND_MAX_SIZE];
00627
00628 coefs1 = s->coefs1[ch];
00629 exponents = s->exponents[ch];
00630 esize = s->exponents_bsize[ch];
00631 mult = pow(10, total_gain * 0.05) / s->max_exponent[ch];
00632 mult *= mdct_norm;
00633 coefs = s->coefs[ch];
00634 if (s->use_noise_coding) {
00635 mult1 = mult;
00636
00637 for(i = 0;i < s->coefs_start; i++) {
00638 *coefs++ = s->noise_table[s->noise_index] *
00639 exponents[i<<bsize>>esize] * mult1;
00640 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
00641 }
00642
00643 n1 = s->exponent_high_sizes[bsize];
00644
00645
00646 exponents = s->exponents[ch] +
00647 (s->high_band_start[bsize]<<bsize>>esize);
00648 last_high_band = 0;
00649 for(j=0;j<n1;j++) {
00650 n = s->exponent_high_bands[s->frame_len_bits -
00651 s->block_len_bits][j];
00652 if (s->high_band_coded[ch][j]) {
00653 float e2, v;
00654 e2 = 0;
00655 for(i = 0;i < n; i++) {
00656 v = exponents[i<<bsize>>esize];
00657 e2 += v * v;
00658 }
00659 exp_power[j] = e2 / n;
00660 last_high_band = j;
00661 tprintf(s->avctx, "%d: power=%f (%d)\n", j, exp_power[j], n);
00662 }
00663 exponents += n<<bsize>>esize;
00664 }
00665
00666
00667 exponents = s->exponents[ch] + (s->coefs_start<<bsize>>esize);
00668 for(j=-1;j<n1;j++) {
00669 if (j < 0) {
00670 n = s->high_band_start[bsize] -
00671 s->coefs_start;
00672 } else {
00673 n = s->exponent_high_bands[s->frame_len_bits -
00674 s->block_len_bits][j];
00675 }
00676 if (j >= 0 && s->high_band_coded[ch][j]) {
00677
00678 mult1 = sqrt(exp_power[j] / exp_power[last_high_band]);
00679
00680 mult1 = mult1 * pow(10, s->high_band_values[ch][j] * 0.05);
00681 mult1 = mult1 / (s->max_exponent[ch] * s->noise_mult);
00682 mult1 *= mdct_norm;
00683 for(i = 0;i < n; i++) {
00684 noise = s->noise_table[s->noise_index];
00685 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
00686 *coefs++ = noise *
00687 exponents[i<<bsize>>esize] * mult1;
00688 }
00689 exponents += n<<bsize>>esize;
00690 } else {
00691
00692 for(i = 0;i < n; i++) {
00693 noise = s->noise_table[s->noise_index];
00694 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
00695 *coefs++ = ((*coefs1++) + noise) *
00696 exponents[i<<bsize>>esize] * mult;
00697 }
00698 exponents += n<<bsize>>esize;
00699 }
00700 }
00701
00702
00703 n = s->block_len - s->coefs_end[bsize];
00704 mult1 = mult * exponents[((-1<<bsize))>>esize];
00705 for(i = 0; i < n; i++) {
00706 *coefs++ = s->noise_table[s->noise_index] * mult1;
00707 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
00708 }
00709 } else {
00710
00711 for(i = 0;i < s->coefs_start; i++)
00712 *coefs++ = 0.0;
00713 n = nb_coefs[ch];
00714 for(i = 0;i < n; i++) {
00715 *coefs++ = coefs1[i] * exponents[i<<bsize>>esize] * mult;
00716 }
00717 n = s->block_len - s->coefs_end[bsize];
00718 for(i = 0;i < n; i++)
00719 *coefs++ = 0.0;
00720 }
00721 }
00722 }
00723
00724 #ifdef TRACE
00725 for(ch = 0; ch < s->nb_channels; ch++) {
00726 if (s->channel_coded[ch]) {
00727 dump_floats(s, "exponents", 3, s->exponents[ch], s->block_len);
00728 dump_floats(s, "coefs", 1, s->coefs[ch], s->block_len);
00729 }
00730 }
00731 #endif
00732
00733 if (s->ms_stereo && s->channel_coded[1]) {
00734
00735
00736
00737 if (!s->channel_coded[0]) {
00738 tprintf(s->avctx, "rare ms-stereo case happened\n");
00739 memset(s->coefs[0], 0, sizeof(float) * s->block_len);
00740 s->channel_coded[0] = 1;
00741 }
00742
00743 s->dsp.butterflies_float(s->coefs[0], s->coefs[1], s->block_len);
00744 }
00745
00746 next:
00747 mdct = &s->mdct_ctx[bsize];
00748
00749 for(ch = 0; ch < s->nb_channels; ch++) {
00750 int n4, index;
00751
00752 n4 = s->block_len / 2;
00753 if(s->channel_coded[ch]){
00754 mdct->imdct_calc(mdct, s->output, s->coefs[ch]);
00755 }else if(!(s->ms_stereo && ch==1))
00756 memset(s->output, 0, sizeof(s->output));
00757
00758
00759 index = (s->frame_len / 2) + s->block_pos - n4;
00760 wma_window(s, &s->frame_out[ch][index]);
00761 }
00762
00763
00764 s->block_num++;
00765 s->block_pos += s->block_len;
00766 if (s->block_pos >= s->frame_len)
00767 return 1;
00768 else
00769 return 0;
00770 }
00771
00772
00773 static int wma_decode_frame(WMACodecContext *s, int16_t *samples)
00774 {
00775 int ret, n, ch, incr;
00776 const float *output[MAX_CHANNELS];
00777
00778 #ifdef TRACE
00779 tprintf(s->avctx, "***decode_frame: %d size=%d\n", s->frame_count++, s->frame_len);
00780 #endif
00781
00782
00783 s->block_num = 0;
00784 s->block_pos = 0;
00785 for(;;) {
00786 ret = wma_decode_block(s);
00787 if (ret < 0)
00788 return -1;
00789 if (ret)
00790 break;
00791 }
00792
00793
00794 n = s->frame_len;
00795 incr = s->nb_channels;
00796 for (ch = 0; ch < MAX_CHANNELS; ch++)
00797 output[ch] = s->frame_out[ch];
00798 s->fmt_conv.float_to_int16_interleave(samples, output, n, incr);
00799 for (ch = 0; ch < incr; ch++) {
00800
00801 memmove(&s->frame_out[ch][0], &s->frame_out[ch][n], n * sizeof(float));
00802 }
00803
00804 #ifdef TRACE
00805 dump_shorts(s, "samples", samples, n * s->nb_channels);
00806 #endif
00807 return 0;
00808 }
00809
00810 static int wma_decode_superframe(AVCodecContext *avctx, void *data,
00811 int *got_frame_ptr, AVPacket *avpkt)
00812 {
00813 const uint8_t *buf = avpkt->data;
00814 int buf_size = avpkt->size;
00815 WMACodecContext *s = avctx->priv_data;
00816 int nb_frames, bit_offset, i, pos, len, ret;
00817 uint8_t *q;
00818 int16_t *samples;
00819
00820 tprintf(avctx, "***decode_superframe:\n");
00821
00822 if(buf_size==0){
00823 s->last_superframe_len = 0;
00824 return 0;
00825 }
00826 if (buf_size < s->block_align) {
00827 av_log(avctx, AV_LOG_ERROR,
00828 "Input packet size too small (%d < %d)\n",
00829 buf_size, s->block_align);
00830 return AVERROR_INVALIDDATA;
00831 }
00832 buf_size = s->block_align;
00833
00834 init_get_bits(&s->gb, buf, buf_size*8);
00835
00836 if (s->use_bit_reservoir) {
00837
00838 skip_bits(&s->gb, 4);
00839 nb_frames = get_bits(&s->gb, 4) - (s->last_superframe_len <= 0);
00840 } else {
00841 nb_frames = 1;
00842 }
00843
00844
00845 s->frame.nb_samples = nb_frames * s->frame_len;
00846 if ((ret = ff_get_buffer(avctx, &s->frame)) < 0) {
00847 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00848 return ret;
00849 }
00850 samples = (int16_t *)s->frame.data[0];
00851
00852 if (s->use_bit_reservoir) {
00853 bit_offset = get_bits(&s->gb, s->byte_offset_bits + 3);
00854 if (bit_offset > get_bits_left(&s->gb)) {
00855 av_log(avctx, AV_LOG_ERROR,
00856 "Invalid last frame bit offset %d > buf size %d (%d)\n",
00857 bit_offset, get_bits_left(&s->gb), buf_size);
00858 goto fail;
00859 }
00860
00861 if (s->last_superframe_len > 0) {
00862
00863
00864 if ((s->last_superframe_len + ((bit_offset + 7) >> 3)) >
00865 MAX_CODED_SUPERFRAME_SIZE)
00866 goto fail;
00867 q = s->last_superframe + s->last_superframe_len;
00868 len = bit_offset;
00869 while (len > 7) {
00870 *q++ = (get_bits)(&s->gb, 8);
00871 len -= 8;
00872 }
00873 if (len > 0) {
00874 *q++ = (get_bits)(&s->gb, len) << (8 - len);
00875 }
00876 memset(q, 0, FF_INPUT_BUFFER_PADDING_SIZE);
00877
00878
00879 init_get_bits(&s->gb, s->last_superframe, s->last_superframe_len * 8 + bit_offset);
00880
00881 if (s->last_bitoffset > 0)
00882 skip_bits(&s->gb, s->last_bitoffset);
00883
00884
00885 if (wma_decode_frame(s, samples) < 0)
00886 goto fail;
00887 samples += s->nb_channels * s->frame_len;
00888 nb_frames--;
00889 }
00890
00891
00892 pos = bit_offset + 4 + 4 + s->byte_offset_bits + 3;
00893 if (pos >= MAX_CODED_SUPERFRAME_SIZE * 8 || pos > buf_size * 8)
00894 return AVERROR_INVALIDDATA;
00895 init_get_bits(&s->gb, buf + (pos >> 3), (buf_size - (pos >> 3))*8);
00896 len = pos & 7;
00897 if (len > 0)
00898 skip_bits(&s->gb, len);
00899
00900 s->reset_block_lengths = 1;
00901 for(i=0;i<nb_frames;i++) {
00902 if (wma_decode_frame(s, samples) < 0)
00903 goto fail;
00904 samples += s->nb_channels * s->frame_len;
00905 }
00906
00907
00908 pos = get_bits_count(&s->gb) + ((bit_offset + 4 + 4 + s->byte_offset_bits + 3) & ~7);
00909 s->last_bitoffset = pos & 7;
00910 pos >>= 3;
00911 len = buf_size - pos;
00912 if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0) {
00913 av_log(s->avctx, AV_LOG_ERROR, "len %d invalid\n", len);
00914 goto fail;
00915 }
00916 s->last_superframe_len = len;
00917 memcpy(s->last_superframe, buf + pos, len);
00918 } else {
00919
00920 if (wma_decode_frame(s, samples) < 0)
00921 goto fail;
00922 samples += s->nb_channels * s->frame_len;
00923 }
00924
00925
00926
00927 *got_frame_ptr = 1;
00928 *(AVFrame *)data = s->frame;
00929
00930 return s->block_align;
00931 fail:
00932
00933 s->last_superframe_len = 0;
00934 return -1;
00935 }
00936
00937 static av_cold void flush(AVCodecContext *avctx)
00938 {
00939 WMACodecContext *s = avctx->priv_data;
00940
00941 s->last_bitoffset=
00942 s->last_superframe_len= 0;
00943 }
00944
00945 AVCodec ff_wmav1_decoder = {
00946 .name = "wmav1",
00947 .type = AVMEDIA_TYPE_AUDIO,
00948 .id = CODEC_ID_WMAV1,
00949 .priv_data_size = sizeof(WMACodecContext),
00950 .init = wma_decode_init,
00951 .close = ff_wma_end,
00952 .decode = wma_decode_superframe,
00953 .flush = flush,
00954 .capabilities = CODEC_CAP_DR1,
00955 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
00956 };
00957
00958 AVCodec ff_wmav2_decoder = {
00959 .name = "wmav2",
00960 .type = AVMEDIA_TYPE_AUDIO,
00961 .id = CODEC_ID_WMAV2,
00962 .priv_data_size = sizeof(WMACodecContext),
00963 .init = wma_decode_init,
00964 .close = ff_wma_end,
00965 .decode = wma_decode_superframe,
00966 .flush = flush,
00967 .capabilities = CODEC_CAP_DR1,
00968 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),
00969 };