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00022 #include "avcodec.h"
00023 #include "wma.h"
00024 #include "wmadata.h"
00025
00026 #undef NDEBUG
00027 #include <assert.h>
00028
00029
00030
00031 static void init_coef_vlc(VLC *vlc, uint16_t **prun_table,
00032 float **plevel_table, uint16_t **pint_table,
00033 const CoefVLCTable *vlc_table)
00034 {
00035 int n = vlc_table->n;
00036 const uint8_t *table_bits = vlc_table->huffbits;
00037 const uint32_t *table_codes = vlc_table->huffcodes;
00038 const uint16_t *levels_table = vlc_table->levels;
00039 uint16_t *run_table, *level_table, *int_table;
00040 float *flevel_table;
00041 int i, l, j, k, level;
00042
00043 init_vlc(vlc, VLCBITS, n, table_bits, 1, 1, table_codes, 4, 4, 0);
00044
00045 run_table = av_malloc(n * sizeof(uint16_t));
00046 level_table = av_malloc(n * sizeof(uint16_t));
00047 flevel_table= av_malloc(n * sizeof(*flevel_table));
00048 int_table = av_malloc(n * sizeof(uint16_t));
00049 i = 2;
00050 level = 1;
00051 k = 0;
00052 while (i < n) {
00053 int_table[k] = i;
00054 l = levels_table[k++];
00055 for (j = 0; j < l; j++) {
00056 run_table[i] = j;
00057 level_table[i] = level;
00058 flevel_table[i]= level;
00059 i++;
00060 }
00061 level++;
00062 }
00063 *prun_table = run_table;
00064 *plevel_table = flevel_table;
00065 *pint_table = int_table;
00066 av_free(level_table);
00067 }
00068
00076 int av_cold ff_wma_get_frame_len_bits(int sample_rate, int version,
00077 unsigned int decode_flags)
00078 {
00079
00080 int frame_len_bits;
00081
00082 if (sample_rate <= 16000) {
00083 frame_len_bits = 9;
00084 } else if (sample_rate <= 22050 ||
00085 (sample_rate <= 32000 && version == 1)) {
00086 frame_len_bits = 10;
00087 } else if (sample_rate <= 48000) {
00088 frame_len_bits = 11;
00089 } else if (sample_rate <= 96000) {
00090 frame_len_bits = 12;
00091 } else {
00092 frame_len_bits = 13;
00093 }
00094
00095 if (version == 3) {
00096 int tmp = decode_flags & 0x6;
00097 if (tmp == 0x2) {
00098 ++frame_len_bits;
00099 } else if (tmp == 0x4) {
00100 --frame_len_bits;
00101 } else if (tmp == 0x6) {
00102 frame_len_bits -= 2;
00103 }
00104 }
00105
00106 return frame_len_bits;
00107 }
00108
00109 int ff_wma_init(AVCodecContext *avctx, int flags2)
00110 {
00111 WMACodecContext *s = avctx->priv_data;
00112 int i;
00113 float bps1, high_freq;
00114 volatile float bps;
00115 int sample_rate1;
00116 int coef_vlc_table;
00117
00118 if ( avctx->sample_rate <= 0 || avctx->sample_rate > 50000
00119 || avctx->channels <= 0 || avctx->channels > 8
00120 || avctx->bit_rate <= 0)
00121 return -1;
00122
00123 s->sample_rate = avctx->sample_rate;
00124 s->nb_channels = avctx->channels;
00125 s->bit_rate = avctx->bit_rate;
00126 s->block_align = avctx->block_align;
00127
00128 dsputil_init(&s->dsp, avctx);
00129
00130 if (avctx->codec->id == CODEC_ID_WMAV1) {
00131 s->version = 1;
00132 } else {
00133 s->version = 2;
00134 }
00135
00136
00137 s->frame_len_bits = ff_wma_get_frame_len_bits(s->sample_rate, s->version, 0);
00138 s->next_block_len_bits = s->frame_len_bits;
00139 s->prev_block_len_bits = s->frame_len_bits;
00140 s->block_len_bits = s->frame_len_bits;
00141
00142 s->frame_len = 1 << s->frame_len_bits;
00143 if (s->use_variable_block_len) {
00144 int nb_max, nb;
00145 nb = ((flags2 >> 3) & 3) + 1;
00146 if ((s->bit_rate / s->nb_channels) >= 32000)
00147 nb += 2;
00148 nb_max = s->frame_len_bits - BLOCK_MIN_BITS;
00149 if (nb > nb_max)
00150 nb = nb_max;
00151 s->nb_block_sizes = nb + 1;
00152 } else {
00153 s->nb_block_sizes = 1;
00154 }
00155
00156
00157 s->use_noise_coding = 1;
00158 high_freq = s->sample_rate * 0.5;
00159
00160
00161 sample_rate1 = s->sample_rate;
00162 if (s->version == 2) {
00163 if (sample_rate1 >= 44100) {
00164 sample_rate1 = 44100;
00165 } else if (sample_rate1 >= 22050) {
00166 sample_rate1 = 22050;
00167 } else if (sample_rate1 >= 16000) {
00168 sample_rate1 = 16000;
00169 } else if (sample_rate1 >= 11025) {
00170 sample_rate1 = 11025;
00171 } else if (sample_rate1 >= 8000) {
00172 sample_rate1 = 8000;
00173 }
00174 }
00175
00176 bps = (float)s->bit_rate / (float)(s->nb_channels * s->sample_rate);
00177 s->byte_offset_bits = av_log2((int)(bps * s->frame_len / 8.0 + 0.5)) + 2;
00178
00179
00180
00181 bps1 = bps;
00182 if (s->nb_channels == 2)
00183 bps1 = bps * 1.6;
00184 if (sample_rate1 == 44100) {
00185 if (bps1 >= 0.61) {
00186 s->use_noise_coding = 0;
00187 } else {
00188 high_freq = high_freq * 0.4;
00189 }
00190 } else if (sample_rate1 == 22050) {
00191 if (bps1 >= 1.16) {
00192 s->use_noise_coding = 0;
00193 } else if (bps1 >= 0.72) {
00194 high_freq = high_freq * 0.7;
00195 } else {
00196 high_freq = high_freq * 0.6;
00197 }
00198 } else if (sample_rate1 == 16000) {
00199 if (bps > 0.5) {
00200 high_freq = high_freq * 0.5;
00201 } else {
00202 high_freq = high_freq * 0.3;
00203 }
00204 } else if (sample_rate1 == 11025) {
00205 high_freq = high_freq * 0.7;
00206 } else if (sample_rate1 == 8000) {
00207 if (bps <= 0.625) {
00208 high_freq = high_freq * 0.5;
00209 } else if (bps > 0.75) {
00210 s->use_noise_coding = 0;
00211 } else {
00212 high_freq = high_freq * 0.65;
00213 }
00214 } else {
00215 if (bps >= 0.8) {
00216 high_freq = high_freq * 0.75;
00217 } else if (bps >= 0.6) {
00218 high_freq = high_freq * 0.6;
00219 } else {
00220 high_freq = high_freq * 0.5;
00221 }
00222 }
00223 dprintf(s->avctx, "flags2=0x%x\n", flags2);
00224 dprintf(s->avctx, "version=%d channels=%d sample_rate=%d bitrate=%d block_align=%d\n",
00225 s->version, s->nb_channels, s->sample_rate, s->bit_rate,
00226 s->block_align);
00227 dprintf(s->avctx, "bps=%f bps1=%f high_freq=%f bitoffset=%d\n",
00228 bps, bps1, high_freq, s->byte_offset_bits);
00229 dprintf(s->avctx, "use_noise_coding=%d use_exp_vlc=%d nb_block_sizes=%d\n",
00230 s->use_noise_coding, s->use_exp_vlc, s->nb_block_sizes);
00231
00232
00233 {
00234 int a, b, pos, lpos, k, block_len, i, j, n;
00235 const uint8_t *table;
00236
00237 if (s->version == 1) {
00238 s->coefs_start = 3;
00239 } else {
00240 s->coefs_start = 0;
00241 }
00242 for (k = 0; k < s->nb_block_sizes; k++) {
00243 block_len = s->frame_len >> k;
00244
00245 if (s->version == 1) {
00246 lpos = 0;
00247 for (i = 0; i < 25; i++) {
00248 a = ff_wma_critical_freqs[i];
00249 b = s->sample_rate;
00250 pos = ((block_len * 2 * a) + (b >> 1)) / b;
00251 if (pos > block_len)
00252 pos = block_len;
00253 s->exponent_bands[0][i] = pos - lpos;
00254 if (pos >= block_len) {
00255 i++;
00256 break;
00257 }
00258 lpos = pos;
00259 }
00260 s->exponent_sizes[0] = i;
00261 } else {
00262
00263 table = NULL;
00264 a = s->frame_len_bits - BLOCK_MIN_BITS - k;
00265 if (a < 3) {
00266 if (s->sample_rate >= 44100) {
00267 table = exponent_band_44100[a];
00268 } else if (s->sample_rate >= 32000) {
00269 table = exponent_band_32000[a];
00270 } else if (s->sample_rate >= 22050) {
00271 table = exponent_band_22050[a];
00272 }
00273 }
00274 if (table) {
00275 n = *table++;
00276 for (i = 0; i < n; i++)
00277 s->exponent_bands[k][i] = table[i];
00278 s->exponent_sizes[k] = n;
00279 } else {
00280 j = 0;
00281 lpos = 0;
00282 for (i = 0; i < 25; i++) {
00283 a = ff_wma_critical_freqs[i];
00284 b = s->sample_rate;
00285 pos = ((block_len * 2 * a) + (b << 1)) / (4 * b);
00286 pos <<= 2;
00287 if (pos > block_len)
00288 pos = block_len;
00289 if (pos > lpos)
00290 s->exponent_bands[k][j++] = pos - lpos;
00291 if (pos >= block_len)
00292 break;
00293 lpos = pos;
00294 }
00295 s->exponent_sizes[k] = j;
00296 }
00297 }
00298
00299
00300 s->coefs_end[k] = (s->frame_len - ((s->frame_len * 9) / 100)) >> k;
00301
00302 s->high_band_start[k] = (int)((block_len * 2 * high_freq) /
00303 s->sample_rate + 0.5);
00304 n = s->exponent_sizes[k];
00305 j = 0;
00306 pos = 0;
00307 for (i = 0; i < n; i++) {
00308 int start, end;
00309 start = pos;
00310 pos += s->exponent_bands[k][i];
00311 end = pos;
00312 if (start < s->high_band_start[k])
00313 start = s->high_band_start[k];
00314 if (end > s->coefs_end[k])
00315 end = s->coefs_end[k];
00316 if (end > start)
00317 s->exponent_high_bands[k][j++] = end - start;
00318 }
00319 s->exponent_high_sizes[k] = j;
00320 #if 0
00321 tprintf(s->avctx, "%5d: coefs_end=%d high_band_start=%d nb_high_bands=%d: ",
00322 s->frame_len >> k,
00323 s->coefs_end[k],
00324 s->high_band_start[k],
00325 s->exponent_high_sizes[k]);
00326 for (j = 0; j < s->exponent_high_sizes[k]; j++)
00327 tprintf(s->avctx, " %d", s->exponent_high_bands[k][j]);
00328 tprintf(s->avctx, "\n");
00329 #endif
00330 }
00331 }
00332
00333 #ifdef TRACE
00334 {
00335 int i, j;
00336 for (i = 0; i < s->nb_block_sizes; i++) {
00337 tprintf(s->avctx, "%5d: n=%2d:",
00338 s->frame_len >> i,
00339 s->exponent_sizes[i]);
00340 for (j = 0; j < s->exponent_sizes[i]; j++)
00341 tprintf(s->avctx, " %d", s->exponent_bands[i][j]);
00342 tprintf(s->avctx, "\n");
00343 }
00344 }
00345 #endif
00346
00347
00348 for (i = 0; i < s->nb_block_sizes; i++) {
00349 ff_init_ff_sine_windows(s->frame_len_bits - i);
00350 s->windows[i] = ff_sine_windows[s->frame_len_bits - i];
00351 }
00352
00353 s->reset_block_lengths = 1;
00354
00355 if (s->use_noise_coding) {
00356
00357
00358 if (s->use_exp_vlc) {
00359 s->noise_mult = 0.02;
00360 } else {
00361 s->noise_mult = 0.04;
00362 }
00363
00364 #ifdef TRACE
00365 for (i = 0; i < NOISE_TAB_SIZE; i++)
00366 s->noise_table[i] = 1.0 * s->noise_mult;
00367 #else
00368 {
00369 unsigned int seed;
00370 float norm;
00371 seed = 1;
00372 norm = (1.0 / (float)(1LL << 31)) * sqrt(3) * s->noise_mult;
00373 for (i = 0; i < NOISE_TAB_SIZE; i++) {
00374 seed = seed * 314159 + 1;
00375 s->noise_table[i] = (float)((int)seed) * norm;
00376 }
00377 }
00378 #endif
00379 }
00380
00381
00382 coef_vlc_table = 2;
00383 if (s->sample_rate >= 32000) {
00384 if (bps1 < 0.72) {
00385 coef_vlc_table = 0;
00386 } else if (bps1 < 1.16) {
00387 coef_vlc_table = 1;
00388 }
00389 }
00390 s->coef_vlcs[0]= &coef_vlcs[coef_vlc_table * 2 ];
00391 s->coef_vlcs[1]= &coef_vlcs[coef_vlc_table * 2 + 1];
00392 init_coef_vlc(&s->coef_vlc[0], &s->run_table[0], &s->level_table[0], &s->int_table[0],
00393 s->coef_vlcs[0]);
00394 init_coef_vlc(&s->coef_vlc[1], &s->run_table[1], &s->level_table[1], &s->int_table[1],
00395 s->coef_vlcs[1]);
00396
00397 return 0;
00398 }
00399
00400 int ff_wma_total_gain_to_bits(int total_gain)
00401 {
00402 if (total_gain < 15) return 13;
00403 else if (total_gain < 32) return 12;
00404 else if (total_gain < 40) return 11;
00405 else if (total_gain < 45) return 10;
00406 else return 9;
00407 }
00408
00409 int ff_wma_end(AVCodecContext *avctx)
00410 {
00411 WMACodecContext *s = avctx->priv_data;
00412 int i;
00413
00414 for (i = 0; i < s->nb_block_sizes; i++)
00415 ff_mdct_end(&s->mdct_ctx[i]);
00416
00417 if (s->use_exp_vlc) {
00418 free_vlc(&s->exp_vlc);
00419 }
00420 if (s->use_noise_coding) {
00421 free_vlc(&s->hgain_vlc);
00422 }
00423 for (i = 0; i < 2; i++) {
00424 free_vlc(&s->coef_vlc[i]);
00425 av_free(s->run_table[i]);
00426 av_free(s->level_table[i]);
00427 av_free(s->int_table[i]);
00428 }
00429
00430 return 0;
00431 }
00432
00438 unsigned int ff_wma_get_large_val(GetBitContext* gb)
00439 {
00441 int n_bits = 8;
00443 if (get_bits1(gb)) {
00444 n_bits += 8;
00445 if (get_bits1(gb)) {
00446 n_bits += 8;
00447 if (get_bits1(gb)) {
00448 n_bits += 7;
00449 }
00450 }
00451 }
00452 return get_bits_long(gb, n_bits);
00453 }
00454
00471 int ff_wma_run_level_decode(AVCodecContext* avctx, GetBitContext* gb,
00472 VLC *vlc,
00473 const float *level_table, const uint16_t *run_table,
00474 int version, WMACoef *ptr, int offset,
00475 int num_coefs, int block_len, int frame_len_bits,
00476 int coef_nb_bits)
00477 {
00478 int code, level, sign;
00479 const uint32_t *ilvl = (const uint32_t*)level_table;
00480 uint32_t *iptr = (uint32_t*)ptr;
00481 const unsigned int coef_mask = block_len - 1;
00482 for (; offset < num_coefs; offset++) {
00483 code = get_vlc2(gb, vlc->table, VLCBITS, VLCMAX);
00484 if (code > 1) {
00486 offset += run_table[code];
00487 sign = get_bits1(gb) - 1;
00488 iptr[offset & coef_mask] = ilvl[code] ^ sign<<31;
00489 } else if (code == 1) {
00491 break;
00492 } else {
00494 if (!version) {
00495 level = get_bits(gb, coef_nb_bits);
00498 offset += get_bits(gb, frame_len_bits);
00499 } else {
00500 level = ff_wma_get_large_val(gb);
00502 if (get_bits1(gb)) {
00503 if (get_bits1(gb)) {
00504 if (get_bits1(gb)) {
00505 av_log(avctx,AV_LOG_ERROR,
00506 "broken escape sequence\n");
00507 return -1;
00508 } else
00509 offset += get_bits(gb, frame_len_bits) + 4;
00510 } else
00511 offset += get_bits(gb, 2) + 1;
00512 }
00513 }
00514 sign = get_bits1(gb) - 1;
00515 ptr[offset & coef_mask] = (level^sign) - sign;
00516 }
00517 }
00519 if (offset > num_coefs) {
00520 av_log(avctx, AV_LOG_ERROR, "overflow in spectral RLE, ignoring\n");
00521 return -1;
00522 }
00523
00524 return 0;
00525 }
00526