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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_floats(WMACodecContext *s, const char *name, int prec, const float *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, " %8.*f", prec, tab[i]);
00061 if ((i & 7) == 7)
00062 tprintf(s->avctx, "\n");
00063 }
00064 if ((i & 7) != 0)
00065 tprintf(s->avctx, "\n");
00066 }
00067 #endif
00068
00069 static int wma_decode_init(AVCodecContext * avctx)
00070 {
00071 WMACodecContext *s = avctx->priv_data;
00072 int i, flags2;
00073 uint8_t *extradata;
00074
00075 s->avctx = avctx;
00076
00077
00078 flags2 = 0;
00079 extradata = avctx->extradata;
00080 if (avctx->codec->id == AV_CODEC_ID_WMAV1 && avctx->extradata_size >= 4) {
00081 flags2 = AV_RL16(extradata+2);
00082 } else if (avctx->codec->id == AV_CODEC_ID_WMAV2 && avctx->extradata_size >= 6) {
00083 flags2 = AV_RL16(extradata+4);
00084 }
00085
00086 s->use_exp_vlc = flags2 & 0x0001;
00087 s->use_bit_reservoir = flags2 & 0x0002;
00088 s->use_variable_block_len = flags2 & 0x0004;
00089
00090 if(avctx->codec->id == AV_CODEC_ID_WMAV2 && avctx->extradata_size >= 8){
00091 if(AV_RL16(extradata+4)==0xd && s->use_variable_block_len){
00092 av_log(avctx, AV_LOG_WARNING, "Disabling use_variable_block_len, if this fails contact the ffmpeg developers and send us the file\n");
00093 s->use_variable_block_len= 0;
00094 }
00095 }
00096
00097 if(ff_wma_init(avctx, flags2)<0)
00098 return -1;
00099
00100
00101 for(i = 0; i < s->nb_block_sizes; i++)
00102 ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 1, 1.0 / 32768.0);
00103
00104 if (s->use_noise_coding) {
00105 init_vlc(&s->hgain_vlc, HGAINVLCBITS, sizeof(ff_wma_hgain_huffbits),
00106 ff_wma_hgain_huffbits, 1, 1,
00107 ff_wma_hgain_huffcodes, 2, 2, 0);
00108 }
00109
00110 if (s->use_exp_vlc) {
00111 init_vlc(&s->exp_vlc, EXPVLCBITS, sizeof(ff_aac_scalefactor_bits),
00112 ff_aac_scalefactor_bits, 1, 1,
00113 ff_aac_scalefactor_code, 4, 4, 0);
00114 } else {
00115 wma_lsp_to_curve_init(s, s->frame_len);
00116 }
00117
00118 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
00119
00120 avcodec_get_frame_defaults(&s->frame);
00121 avctx->coded_frame = &s->frame;
00122
00123 return 0;
00124 }
00125
00132 static inline float pow_m1_4(WMACodecContext *s, float x)
00133 {
00134 union {
00135 float f;
00136 unsigned int v;
00137 } u, t;
00138 unsigned int e, m;
00139 float a, b;
00140
00141 u.f = x;
00142 e = u.v >> 23;
00143 m = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1);
00144
00145 t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23);
00146 a = s->lsp_pow_m_table1[m];
00147 b = s->lsp_pow_m_table2[m];
00148 return s->lsp_pow_e_table[e] * (a + b * t.f);
00149 }
00150
00151 static void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len)
00152 {
00153 float wdel, a, b;
00154 int i, e, m;
00155
00156 wdel = M_PI / frame_len;
00157 for(i=0;i<frame_len;i++)
00158 s->lsp_cos_table[i] = 2.0f * cos(wdel * i);
00159
00160
00161 for(i=0;i<256;i++) {
00162 e = i - 126;
00163 s->lsp_pow_e_table[i] = pow(2.0, e * -0.25);
00164 }
00165
00166
00167
00168 b = 1.0;
00169 for(i=(1 << LSP_POW_BITS) - 1;i>=0;i--) {
00170 m = (1 << LSP_POW_BITS) + i;
00171 a = (float)m * (0.5 / (1 << LSP_POW_BITS));
00172 a = pow(a, -0.25);
00173 s->lsp_pow_m_table1[i] = 2 * a - b;
00174 s->lsp_pow_m_table2[i] = b - a;
00175 b = a;
00176 }
00177 }
00178
00183 static void wma_lsp_to_curve(WMACodecContext *s,
00184 float *out, float *val_max_ptr,
00185 int n, float *lsp)
00186 {
00187 int i, j;
00188 float p, q, w, v, val_max;
00189
00190 val_max = 0;
00191 for(i=0;i<n;i++) {
00192 p = 0.5f;
00193 q = 0.5f;
00194 w = s->lsp_cos_table[i];
00195 for(j=1;j<NB_LSP_COEFS;j+=2){
00196 q *= w - lsp[j - 1];
00197 p *= w - lsp[j];
00198 }
00199 p *= p * (2.0f - w);
00200 q *= q * (2.0f + w);
00201 v = p + q;
00202 v = pow_m1_4(s, v);
00203 if (v > val_max)
00204 val_max = v;
00205 out[i] = v;
00206 }
00207 *val_max_ptr = val_max;
00208 }
00209
00213 static void decode_exp_lsp(WMACodecContext *s, int ch)
00214 {
00215 float lsp_coefs[NB_LSP_COEFS];
00216 int val, i;
00217
00218 for(i = 0; i < NB_LSP_COEFS; i++) {
00219 if (i == 0 || i >= 8)
00220 val = get_bits(&s->gb, 3);
00221 else
00222 val = get_bits(&s->gb, 4);
00223 lsp_coefs[i] = ff_wma_lsp_codebook[i][val];
00224 }
00225
00226 wma_lsp_to_curve(s, s->exponents[ch], &s->max_exponent[ch],
00227 s->block_len, lsp_coefs);
00228 }
00229
00231 static const float pow_tab[] = {
00232 1.7782794100389e-04, 2.0535250264571e-04,
00233 2.3713737056617e-04, 2.7384196342644e-04,
00234 3.1622776601684e-04, 3.6517412725484e-04,
00235 4.2169650342858e-04, 4.8696752516586e-04,
00236 5.6234132519035e-04, 6.4938163157621e-04,
00237 7.4989420933246e-04, 8.6596432336006e-04,
00238 1.0000000000000e-03, 1.1547819846895e-03,
00239 1.3335214321633e-03, 1.5399265260595e-03,
00240 1.7782794100389e-03, 2.0535250264571e-03,
00241 2.3713737056617e-03, 2.7384196342644e-03,
00242 3.1622776601684e-03, 3.6517412725484e-03,
00243 4.2169650342858e-03, 4.8696752516586e-03,
00244 5.6234132519035e-03, 6.4938163157621e-03,
00245 7.4989420933246e-03, 8.6596432336006e-03,
00246 1.0000000000000e-02, 1.1547819846895e-02,
00247 1.3335214321633e-02, 1.5399265260595e-02,
00248 1.7782794100389e-02, 2.0535250264571e-02,
00249 2.3713737056617e-02, 2.7384196342644e-02,
00250 3.1622776601684e-02, 3.6517412725484e-02,
00251 4.2169650342858e-02, 4.8696752516586e-02,
00252 5.6234132519035e-02, 6.4938163157621e-02,
00253 7.4989420933246e-02, 8.6596432336007e-02,
00254 1.0000000000000e-01, 1.1547819846895e-01,
00255 1.3335214321633e-01, 1.5399265260595e-01,
00256 1.7782794100389e-01, 2.0535250264571e-01,
00257 2.3713737056617e-01, 2.7384196342644e-01,
00258 3.1622776601684e-01, 3.6517412725484e-01,
00259 4.2169650342858e-01, 4.8696752516586e-01,
00260 5.6234132519035e-01, 6.4938163157621e-01,
00261 7.4989420933246e-01, 8.6596432336007e-01,
00262 1.0000000000000e+00, 1.1547819846895e+00,
00263 1.3335214321633e+00, 1.5399265260595e+00,
00264 1.7782794100389e+00, 2.0535250264571e+00,
00265 2.3713737056617e+00, 2.7384196342644e+00,
00266 3.1622776601684e+00, 3.6517412725484e+00,
00267 4.2169650342858e+00, 4.8696752516586e+00,
00268 5.6234132519035e+00, 6.4938163157621e+00,
00269 7.4989420933246e+00, 8.6596432336007e+00,
00270 1.0000000000000e+01, 1.1547819846895e+01,
00271 1.3335214321633e+01, 1.5399265260595e+01,
00272 1.7782794100389e+01, 2.0535250264571e+01,
00273 2.3713737056617e+01, 2.7384196342644e+01,
00274 3.1622776601684e+01, 3.6517412725484e+01,
00275 4.2169650342858e+01, 4.8696752516586e+01,
00276 5.6234132519035e+01, 6.4938163157621e+01,
00277 7.4989420933246e+01, 8.6596432336007e+01,
00278 1.0000000000000e+02, 1.1547819846895e+02,
00279 1.3335214321633e+02, 1.5399265260595e+02,
00280 1.7782794100389e+02, 2.0535250264571e+02,
00281 2.3713737056617e+02, 2.7384196342644e+02,
00282 3.1622776601684e+02, 3.6517412725484e+02,
00283 4.2169650342858e+02, 4.8696752516586e+02,
00284 5.6234132519035e+02, 6.4938163157621e+02,
00285 7.4989420933246e+02, 8.6596432336007e+02,
00286 1.0000000000000e+03, 1.1547819846895e+03,
00287 1.3335214321633e+03, 1.5399265260595e+03,
00288 1.7782794100389e+03, 2.0535250264571e+03,
00289 2.3713737056617e+03, 2.7384196342644e+03,
00290 3.1622776601684e+03, 3.6517412725484e+03,
00291 4.2169650342858e+03, 4.8696752516586e+03,
00292 5.6234132519035e+03, 6.4938163157621e+03,
00293 7.4989420933246e+03, 8.6596432336007e+03,
00294 1.0000000000000e+04, 1.1547819846895e+04,
00295 1.3335214321633e+04, 1.5399265260595e+04,
00296 1.7782794100389e+04, 2.0535250264571e+04,
00297 2.3713737056617e+04, 2.7384196342644e+04,
00298 3.1622776601684e+04, 3.6517412725484e+04,
00299 4.2169650342858e+04, 4.8696752516586e+04,
00300 5.6234132519035e+04, 6.4938163157621e+04,
00301 7.4989420933246e+04, 8.6596432336007e+04,
00302 1.0000000000000e+05, 1.1547819846895e+05,
00303 1.3335214321633e+05, 1.5399265260595e+05,
00304 1.7782794100389e+05, 2.0535250264571e+05,
00305 2.3713737056617e+05, 2.7384196342644e+05,
00306 3.1622776601684e+05, 3.6517412725484e+05,
00307 4.2169650342858e+05, 4.8696752516586e+05,
00308 5.6234132519035e+05, 6.4938163157621e+05,
00309 7.4989420933246e+05, 8.6596432336007e+05,
00310 };
00311
00315 static int decode_exp_vlc(WMACodecContext *s, int ch)
00316 {
00317 int last_exp, n, code;
00318 const uint16_t *ptr;
00319 float v, max_scale;
00320 uint32_t *q, *q_end, iv;
00321 const float *ptab = pow_tab + 60;
00322 const uint32_t *iptab = (const uint32_t*)ptab;
00323
00324 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
00325 q = (uint32_t *)s->exponents[ch];
00326 q_end = q + s->block_len;
00327 max_scale = 0;
00328 if (s->version == 1) {
00329 last_exp = get_bits(&s->gb, 5) + 10;
00330 v = ptab[last_exp];
00331 iv = iptab[last_exp];
00332 max_scale = v;
00333 n = *ptr++;
00334 switch (n & 3) do {
00335 case 0: *q++ = iv;
00336 case 3: *q++ = iv;
00337 case 2: *q++ = iv;
00338 case 1: *q++ = iv;
00339 } while ((n -= 4) > 0);
00340 }else
00341 last_exp = 36;
00342
00343 while (q < q_end) {
00344 code = get_vlc2(&s->gb, s->exp_vlc.table, EXPVLCBITS, EXPMAX);
00345 if (code < 0){
00346 av_log(s->avctx, AV_LOG_ERROR, "Exponent vlc invalid\n");
00347 return -1;
00348 }
00349
00350 last_exp += code - 60;
00351 if ((unsigned)last_exp + 60 >= FF_ARRAY_ELEMS(pow_tab)) {
00352 av_log(s->avctx, AV_LOG_ERROR, "Exponent out of range: %d\n",
00353 last_exp);
00354 return -1;
00355 }
00356 v = ptab[last_exp];
00357 iv = iptab[last_exp];
00358 if (v > max_scale)
00359 max_scale = v;
00360 n = *ptr++;
00361 switch (n & 3) do {
00362 case 0: *q++ = iv;
00363 case 3: *q++ = iv;
00364 case 2: *q++ = iv;
00365 case 1: *q++ = iv;
00366 } while ((n -= 4) > 0);
00367 }
00368 s->max_exponent[ch] = max_scale;
00369 return 0;
00370 }
00371
00372
00379 static void wma_window(WMACodecContext *s, float *out)
00380 {
00381 float *in = s->output;
00382 int block_len, bsize, n;
00383
00384
00385 if (s->block_len_bits <= s->prev_block_len_bits) {
00386 block_len = s->block_len;
00387 bsize = s->frame_len_bits - s->block_len_bits;
00388
00389 s->dsp.vector_fmul_add(out, in, s->windows[bsize],
00390 out, block_len);
00391
00392 } else {
00393 block_len = 1 << s->prev_block_len_bits;
00394 n = (s->block_len - block_len) / 2;
00395 bsize = s->frame_len_bits - s->prev_block_len_bits;
00396
00397 s->dsp.vector_fmul_add(out+n, in+n, s->windows[bsize],
00398 out+n, block_len);
00399
00400 memcpy(out+n+block_len, in+n+block_len, n*sizeof(float));
00401 }
00402
00403 out += s->block_len;
00404 in += s->block_len;
00405
00406
00407 if (s->block_len_bits <= s->next_block_len_bits) {
00408 block_len = s->block_len;
00409 bsize = s->frame_len_bits - s->block_len_bits;
00410
00411 s->dsp.vector_fmul_reverse(out, in, s->windows[bsize], block_len);
00412
00413 } else {
00414 block_len = 1 << s->next_block_len_bits;
00415 n = (s->block_len - block_len) / 2;
00416 bsize = s->frame_len_bits - s->next_block_len_bits;
00417
00418 memcpy(out, in, n*sizeof(float));
00419
00420 s->dsp.vector_fmul_reverse(out+n, in+n, s->windows[bsize], block_len);
00421
00422 memset(out+n+block_len, 0, n*sizeof(float));
00423 }
00424 }
00425
00426
00431 static int wma_decode_block(WMACodecContext *s)
00432 {
00433 int n, v, a, ch, bsize;
00434 int coef_nb_bits, total_gain;
00435 int nb_coefs[MAX_CHANNELS];
00436 float mdct_norm;
00437 FFTContext *mdct;
00438
00439 #ifdef TRACE
00440 tprintf(s->avctx, "***decode_block: %d:%d\n", s->frame_count - 1, s->block_num);
00441 #endif
00442
00443
00444 if (s->use_variable_block_len) {
00445 n = av_log2(s->nb_block_sizes - 1) + 1;
00446
00447 if (s->reset_block_lengths) {
00448 s->reset_block_lengths = 0;
00449 v = get_bits(&s->gb, n);
00450 if (v >= s->nb_block_sizes){
00451 av_log(s->avctx, AV_LOG_ERROR, "prev_block_len_bits %d out of range\n", s->frame_len_bits - v);
00452 return -1;
00453 }
00454 s->prev_block_len_bits = s->frame_len_bits - v;
00455 v = get_bits(&s->gb, n);
00456 if (v >= s->nb_block_sizes){
00457 av_log(s->avctx, AV_LOG_ERROR, "block_len_bits %d out of range\n", s->frame_len_bits - v);
00458 return -1;
00459 }
00460 s->block_len_bits = s->frame_len_bits - v;
00461 } else {
00462
00463 s->prev_block_len_bits = s->block_len_bits;
00464 s->block_len_bits = s->next_block_len_bits;
00465 }
00466 v = get_bits(&s->gb, n);
00467 if (v >= s->nb_block_sizes){
00468 av_log(s->avctx, AV_LOG_ERROR, "next_block_len_bits %d out of range\n", s->frame_len_bits - v);
00469 return -1;
00470 }
00471 s->next_block_len_bits = s->frame_len_bits - v;
00472 } else {
00473
00474 s->next_block_len_bits = s->frame_len_bits;
00475 s->prev_block_len_bits = s->frame_len_bits;
00476 s->block_len_bits = s->frame_len_bits;
00477 }
00478
00479 if (s->frame_len_bits - s->block_len_bits >= s->nb_block_sizes){
00480 av_log(s->avctx, AV_LOG_ERROR, "block_len_bits not initialized to a valid value\n");
00481 return -1;
00482 }
00483
00484
00485 s->block_len = 1 << s->block_len_bits;
00486 if ((s->block_pos + s->block_len) > s->frame_len){
00487 av_log(s->avctx, AV_LOG_ERROR, "frame_len overflow\n");
00488 return -1;
00489 }
00490
00491 if (s->avctx->channels == 2) {
00492 s->ms_stereo = get_bits1(&s->gb);
00493 }
00494 v = 0;
00495 for(ch = 0; ch < s->avctx->channels; ch++) {
00496 a = get_bits1(&s->gb);
00497 s->channel_coded[ch] = a;
00498 v |= a;
00499 }
00500
00501 bsize = s->frame_len_bits - s->block_len_bits;
00502
00503
00504
00505 if (!v)
00506 goto next;
00507
00508
00509
00510 total_gain = 1;
00511 for(;;) {
00512 a = get_bits(&s->gb, 7);
00513 total_gain += a;
00514 if (a != 127)
00515 break;
00516 }
00517
00518 coef_nb_bits= ff_wma_total_gain_to_bits(total_gain);
00519
00520
00521 n = s->coefs_end[bsize] - s->coefs_start;
00522 for(ch = 0; ch < s->avctx->channels; ch++)
00523 nb_coefs[ch] = n;
00524
00525
00526 if (s->use_noise_coding) {
00527
00528 for(ch = 0; ch < s->avctx->channels; ch++) {
00529 if (s->channel_coded[ch]) {
00530 int i, n, a;
00531 n = s->exponent_high_sizes[bsize];
00532 for(i=0;i<n;i++) {
00533 a = get_bits1(&s->gb);
00534 s->high_band_coded[ch][i] = a;
00535
00536 if (a)
00537 nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
00538 }
00539 }
00540 }
00541 for(ch = 0; ch < s->avctx->channels; ch++) {
00542 if (s->channel_coded[ch]) {
00543 int i, n, val, code;
00544
00545 n = s->exponent_high_sizes[bsize];
00546 val = (int)0x80000000;
00547 for(i=0;i<n;i++) {
00548 if (s->high_band_coded[ch][i]) {
00549 if (val == (int)0x80000000) {
00550 val = get_bits(&s->gb, 7) - 19;
00551 } else {
00552 code = get_vlc2(&s->gb, s->hgain_vlc.table, HGAINVLCBITS, HGAINMAX);
00553 if (code < 0){
00554 av_log(s->avctx, AV_LOG_ERROR, "hgain vlc invalid\n");
00555 return -1;
00556 }
00557 val += code - 18;
00558 }
00559 s->high_band_values[ch][i] = val;
00560 }
00561 }
00562 }
00563 }
00564 }
00565
00566
00567 if ((s->block_len_bits == s->frame_len_bits) ||
00568 get_bits1(&s->gb)) {
00569 for(ch = 0; ch < s->avctx->channels; ch++) {
00570 if (s->channel_coded[ch]) {
00571 if (s->use_exp_vlc) {
00572 if (decode_exp_vlc(s, ch) < 0)
00573 return -1;
00574 } else {
00575 decode_exp_lsp(s, ch);
00576 }
00577 s->exponents_bsize[ch] = bsize;
00578 }
00579 }
00580 }
00581
00582
00583 for (ch = 0; ch < s->avctx->channels; ch++) {
00584 if (s->channel_coded[ch]) {
00585 int tindex;
00586 WMACoef* ptr = &s->coefs1[ch][0];
00587
00588
00589
00590 tindex = (ch == 1 && s->ms_stereo);
00591 memset(ptr, 0, s->block_len * sizeof(WMACoef));
00592 ff_wma_run_level_decode(s->avctx, &s->gb, &s->coef_vlc[tindex],
00593 s->level_table[tindex], s->run_table[tindex],
00594 0, ptr, 0, nb_coefs[ch],
00595 s->block_len, s->frame_len_bits, coef_nb_bits);
00596 }
00597 if (s->version == 1 && s->avctx->channels >= 2) {
00598 align_get_bits(&s->gb);
00599 }
00600 }
00601
00602
00603 {
00604 int n4 = s->block_len / 2;
00605 mdct_norm = 1.0 / (float)n4;
00606 if (s->version == 1) {
00607 mdct_norm *= sqrt(n4);
00608 }
00609 }
00610
00611
00612 for (ch = 0; ch < s->avctx->channels; ch++) {
00613 if (s->channel_coded[ch]) {
00614 WMACoef *coefs1;
00615 float *coefs, *exponents, mult, mult1, noise;
00616 int i, j, n, n1, last_high_band, esize;
00617 float exp_power[HIGH_BAND_MAX_SIZE];
00618
00619 coefs1 = s->coefs1[ch];
00620 exponents = s->exponents[ch];
00621 esize = s->exponents_bsize[ch];
00622 mult = pow(10, total_gain * 0.05) / s->max_exponent[ch];
00623 mult *= mdct_norm;
00624 coefs = s->coefs[ch];
00625 if (s->use_noise_coding) {
00626 mult1 = mult;
00627
00628 for(i = 0;i < s->coefs_start; i++) {
00629 *coefs++ = s->noise_table[s->noise_index] *
00630 exponents[i<<bsize>>esize] * mult1;
00631 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
00632 }
00633
00634 n1 = s->exponent_high_sizes[bsize];
00635
00636
00637 exponents = s->exponents[ch] +
00638 (s->high_band_start[bsize]<<bsize>>esize);
00639 last_high_band = 0;
00640 for(j=0;j<n1;j++) {
00641 n = s->exponent_high_bands[s->frame_len_bits -
00642 s->block_len_bits][j];
00643 if (s->high_band_coded[ch][j]) {
00644 float e2, v;
00645 e2 = 0;
00646 for(i = 0;i < n; i++) {
00647 v = exponents[i<<bsize>>esize];
00648 e2 += v * v;
00649 }
00650 exp_power[j] = e2 / n;
00651 last_high_band = j;
00652 tprintf(s->avctx, "%d: power=%f (%d)\n", j, exp_power[j], n);
00653 }
00654 exponents += n<<bsize>>esize;
00655 }
00656
00657
00658 exponents = s->exponents[ch] + (s->coefs_start<<bsize>>esize);
00659 for(j=-1;j<n1;j++) {
00660 if (j < 0) {
00661 n = s->high_band_start[bsize] -
00662 s->coefs_start;
00663 } else {
00664 n = s->exponent_high_bands[s->frame_len_bits -
00665 s->block_len_bits][j];
00666 }
00667 if (j >= 0 && s->high_band_coded[ch][j]) {
00668
00669 mult1 = sqrt(exp_power[j] / exp_power[last_high_band]);
00670
00671 mult1 = mult1 * pow(10, s->high_band_values[ch][j] * 0.05);
00672 mult1 = mult1 / (s->max_exponent[ch] * s->noise_mult);
00673 mult1 *= mdct_norm;
00674 for(i = 0;i < n; i++) {
00675 noise = s->noise_table[s->noise_index];
00676 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
00677 *coefs++ = noise *
00678 exponents[i<<bsize>>esize] * mult1;
00679 }
00680 exponents += n<<bsize>>esize;
00681 } else {
00682
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++ = ((*coefs1++) + noise) *
00687 exponents[i<<bsize>>esize] * mult;
00688 }
00689 exponents += n<<bsize>>esize;
00690 }
00691 }
00692
00693
00694 n = s->block_len - s->coefs_end[bsize];
00695 mult1 = mult * exponents[((-1<<bsize))>>esize];
00696 for(i = 0; i < n; i++) {
00697 *coefs++ = s->noise_table[s->noise_index] * mult1;
00698 s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
00699 }
00700 } else {
00701
00702 for(i = 0;i < s->coefs_start; i++)
00703 *coefs++ = 0.0;
00704 n = nb_coefs[ch];
00705 for(i = 0;i < n; i++) {
00706 *coefs++ = coefs1[i] * exponents[i<<bsize>>esize] * mult;
00707 }
00708 n = s->block_len - s->coefs_end[bsize];
00709 for(i = 0;i < n; i++)
00710 *coefs++ = 0.0;
00711 }
00712 }
00713 }
00714
00715 #ifdef TRACE
00716 for (ch = 0; ch < s->avctx->channels; ch++) {
00717 if (s->channel_coded[ch]) {
00718 dump_floats(s, "exponents", 3, s->exponents[ch], s->block_len);
00719 dump_floats(s, "coefs", 1, s->coefs[ch], s->block_len);
00720 }
00721 }
00722 #endif
00723
00724 if (s->ms_stereo && s->channel_coded[1]) {
00725
00726
00727
00728 if (!s->channel_coded[0]) {
00729 tprintf(s->avctx, "rare ms-stereo case happened\n");
00730 memset(s->coefs[0], 0, sizeof(float) * s->block_len);
00731 s->channel_coded[0] = 1;
00732 }
00733
00734 s->dsp.butterflies_float(s->coefs[0], s->coefs[1], s->block_len);
00735 }
00736
00737 next:
00738 mdct = &s->mdct_ctx[bsize];
00739
00740 for (ch = 0; ch < s->avctx->channels; ch++) {
00741 int n4, index;
00742
00743 n4 = s->block_len / 2;
00744 if(s->channel_coded[ch]){
00745 mdct->imdct_calc(mdct, s->output, s->coefs[ch]);
00746 }else if(!(s->ms_stereo && ch==1))
00747 memset(s->output, 0, sizeof(s->output));
00748
00749
00750 index = (s->frame_len / 2) + s->block_pos - n4;
00751 wma_window(s, &s->frame_out[ch][index]);
00752 }
00753
00754
00755 s->block_num++;
00756 s->block_pos += s->block_len;
00757 if (s->block_pos >= s->frame_len)
00758 return 1;
00759 else
00760 return 0;
00761 }
00762
00763
00764 static int wma_decode_frame(WMACodecContext *s, float **samples,
00765 int samples_offset)
00766 {
00767 int ret, ch;
00768
00769 #ifdef TRACE
00770 tprintf(s->avctx, "***decode_frame: %d size=%d\n", s->frame_count++, s->frame_len);
00771 #endif
00772
00773
00774 s->block_num = 0;
00775 s->block_pos = 0;
00776 for(;;) {
00777 ret = wma_decode_block(s);
00778 if (ret < 0)
00779 return -1;
00780 if (ret)
00781 break;
00782 }
00783
00784 for (ch = 0; ch < s->avctx->channels; ch++) {
00785
00786 memcpy(samples[ch] + samples_offset, s->frame_out[ch],
00787 s->frame_len * sizeof(*s->frame_out[ch]));
00788
00789 memmove(&s->frame_out[ch][0], &s->frame_out[ch][s->frame_len],
00790 s->frame_len * sizeof(*s->frame_out[ch]));
00791
00792 #ifdef TRACE
00793 dump_floats(s, "samples", 6, samples[ch] + samples_offset, s->frame_len);
00794 #endif
00795 }
00796
00797 return 0;
00798 }
00799
00800 static int wma_decode_superframe(AVCodecContext *avctx, void *data,
00801 int *got_frame_ptr, AVPacket *avpkt)
00802 {
00803 const uint8_t *buf = avpkt->data;
00804 int buf_size = avpkt->size;
00805 WMACodecContext *s = avctx->priv_data;
00806 int nb_frames, bit_offset, i, pos, len, ret;
00807 uint8_t *q;
00808 float **samples;
00809 int samples_offset;
00810
00811 tprintf(avctx, "***decode_superframe:\n");
00812
00813 if(buf_size==0){
00814 s->last_superframe_len = 0;
00815 return 0;
00816 }
00817 if (buf_size < avctx->block_align) {
00818 av_log(avctx, AV_LOG_ERROR,
00819 "Input packet size too small (%d < %d)\n",
00820 buf_size, avctx->block_align);
00821 return AVERROR_INVALIDDATA;
00822 }
00823 if(avctx->block_align)
00824 buf_size = avctx->block_align;
00825
00826 init_get_bits(&s->gb, buf, buf_size*8);
00827
00828 if (s->use_bit_reservoir) {
00829
00830 skip_bits(&s->gb, 4);
00831 nb_frames = get_bits(&s->gb, 4) - (s->last_superframe_len <= 0);
00832 } else {
00833 nb_frames = 1;
00834 }
00835
00836
00837 s->frame.nb_samples = nb_frames * s->frame_len;
00838 if ((ret = ff_get_buffer(avctx, &s->frame)) < 0) {
00839 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00840 return ret;
00841 }
00842 samples = (float **)s->frame.extended_data;
00843 samples_offset = 0;
00844
00845 if (s->use_bit_reservoir) {
00846 bit_offset = get_bits(&s->gb, s->byte_offset_bits + 3);
00847 if (bit_offset > get_bits_left(&s->gb)) {
00848 av_log(avctx, AV_LOG_ERROR,
00849 "Invalid last frame bit offset %d > buf size %d (%d)\n",
00850 bit_offset, get_bits_left(&s->gb), buf_size);
00851 goto fail;
00852 }
00853
00854 if (s->last_superframe_len > 0) {
00855
00856 if ((s->last_superframe_len + ((bit_offset + 7) >> 3)) >
00857 MAX_CODED_SUPERFRAME_SIZE)
00858 goto fail;
00859 q = s->last_superframe + s->last_superframe_len;
00860 len = bit_offset;
00861 while (len > 7) {
00862 *q++ = (get_bits)(&s->gb, 8);
00863 len -= 8;
00864 }
00865 if (len > 0) {
00866 *q++ = (get_bits)(&s->gb, len) << (8 - len);
00867 }
00868 memset(q, 0, FF_INPUT_BUFFER_PADDING_SIZE);
00869
00870
00871 init_get_bits(&s->gb, s->last_superframe, s->last_superframe_len * 8 + bit_offset);
00872
00873 if (s->last_bitoffset > 0)
00874 skip_bits(&s->gb, s->last_bitoffset);
00875
00876
00877 if (wma_decode_frame(s, samples, samples_offset) < 0)
00878 goto fail;
00879 samples_offset += s->frame_len;
00880 nb_frames--;
00881 }
00882
00883
00884 pos = bit_offset + 4 + 4 + s->byte_offset_bits + 3;
00885 if (pos >= MAX_CODED_SUPERFRAME_SIZE * 8 || pos > buf_size * 8)
00886 return AVERROR_INVALIDDATA;
00887 init_get_bits(&s->gb, buf + (pos >> 3), (buf_size - (pos >> 3))*8);
00888 len = pos & 7;
00889 if (len > 0)
00890 skip_bits(&s->gb, len);
00891
00892 s->reset_block_lengths = 1;
00893 for(i=0;i<nb_frames;i++) {
00894 if (wma_decode_frame(s, samples, samples_offset) < 0)
00895 goto fail;
00896 samples_offset += s->frame_len;
00897 }
00898
00899
00900 pos = get_bits_count(&s->gb) + ((bit_offset + 4 + 4 + s->byte_offset_bits + 3) & ~7);
00901 s->last_bitoffset = pos & 7;
00902 pos >>= 3;
00903 len = buf_size - pos;
00904 if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0) {
00905 av_log(s->avctx, AV_LOG_ERROR, "len %d invalid\n", len);
00906 goto fail;
00907 }
00908 s->last_superframe_len = len;
00909 memcpy(s->last_superframe, buf + pos, len);
00910 } else {
00911
00912 if (wma_decode_frame(s, samples, samples_offset) < 0)
00913 goto fail;
00914 samples_offset += s->frame_len;
00915 }
00916
00917 av_dlog(s->avctx, "%d %d %d %d outbytes:%td eaten:%d\n",
00918 s->frame_len_bits, s->block_len_bits, s->frame_len, s->block_len,
00919 (int8_t *)samples - (int8_t *)data, avctx->block_align);
00920
00921 *got_frame_ptr = 1;
00922 *(AVFrame *)data = s->frame;
00923
00924 return buf_size;
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 #if CONFIG_WMAV1_DECODER
00940 AVCodec ff_wmav1_decoder = {
00941 .name = "wmav1",
00942 .type = AVMEDIA_TYPE_AUDIO,
00943 .id = AV_CODEC_ID_WMAV1,
00944 .priv_data_size = sizeof(WMACodecContext),
00945 .init = wma_decode_init,
00946 .close = ff_wma_end,
00947 .decode = wma_decode_superframe,
00948 .flush = flush,
00949 .capabilities = CODEC_CAP_DR1,
00950 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
00951 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
00952 AV_SAMPLE_FMT_NONE },
00953 };
00954 #endif
00955 #if CONFIG_WMAV2_DECODER
00956 AVCodec ff_wmav2_decoder = {
00957 .name = "wmav2",
00958 .type = AVMEDIA_TYPE_AUDIO,
00959 .id = AV_CODEC_ID_WMAV2,
00960 .priv_data_size = sizeof(WMACodecContext),
00961 .init = wma_decode_init,
00962 .close = ff_wma_end,
00963 .decode = wma_decode_superframe,
00964 .flush = flush,
00965 .capabilities = CODEC_CAP_DR1,
00966 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),
00967 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
00968 AV_SAMPLE_FMT_NONE },
00969 };
00970 #endif