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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
00139 s->frame_len = 1 << s->frame_len_bits;
00140 if (s->use_variable_block_len) {
00141 int nb_max, nb;
00142 nb = ((flags2 >> 3) & 3) + 1;
00143 if ((s->bit_rate / s->nb_channels) >= 32000)
00144 nb += 2;
00145 nb_max = s->frame_len_bits - BLOCK_MIN_BITS;
00146 if (nb > nb_max)
00147 nb = nb_max;
00148 s->nb_block_sizes = nb + 1;
00149 } else {
00150 s->nb_block_sizes = 1;
00151 }
00152
00153
00154 s->use_noise_coding = 1;
00155 high_freq = s->sample_rate * 0.5;
00156
00157
00158 sample_rate1 = s->sample_rate;
00159 if (s->version == 2) {
00160 if (sample_rate1 >= 44100) {
00161 sample_rate1 = 44100;
00162 } else if (sample_rate1 >= 22050) {
00163 sample_rate1 = 22050;
00164 } else if (sample_rate1 >= 16000) {
00165 sample_rate1 = 16000;
00166 } else if (sample_rate1 >= 11025) {
00167 sample_rate1 = 11025;
00168 } else if (sample_rate1 >= 8000) {
00169 sample_rate1 = 8000;
00170 }
00171 }
00172
00173 bps = (float)s->bit_rate / (float)(s->nb_channels * s->sample_rate);
00174 s->byte_offset_bits = av_log2((int)(bps * s->frame_len / 8.0 + 0.5)) + 2;
00175
00176
00177
00178 bps1 = bps;
00179 if (s->nb_channels == 2)
00180 bps1 = bps * 1.6;
00181 if (sample_rate1 == 44100) {
00182 if (bps1 >= 0.61) {
00183 s->use_noise_coding = 0;
00184 } else {
00185 high_freq = high_freq * 0.4;
00186 }
00187 } else if (sample_rate1 == 22050) {
00188 if (bps1 >= 1.16) {
00189 s->use_noise_coding = 0;
00190 } else if (bps1 >= 0.72) {
00191 high_freq = high_freq * 0.7;
00192 } else {
00193 high_freq = high_freq * 0.6;
00194 }
00195 } else if (sample_rate1 == 16000) {
00196 if (bps > 0.5) {
00197 high_freq = high_freq * 0.5;
00198 } else {
00199 high_freq = high_freq * 0.3;
00200 }
00201 } else if (sample_rate1 == 11025) {
00202 high_freq = high_freq * 0.7;
00203 } else if (sample_rate1 == 8000) {
00204 if (bps <= 0.625) {
00205 high_freq = high_freq * 0.5;
00206 } else if (bps > 0.75) {
00207 s->use_noise_coding = 0;
00208 } else {
00209 high_freq = high_freq * 0.65;
00210 }
00211 } else {
00212 if (bps >= 0.8) {
00213 high_freq = high_freq * 0.75;
00214 } else if (bps >= 0.6) {
00215 high_freq = high_freq * 0.6;
00216 } else {
00217 high_freq = high_freq * 0.5;
00218 }
00219 }
00220 dprintf(s->avctx, "flags2=0x%x\n", flags2);
00221 dprintf(s->avctx, "version=%d channels=%d sample_rate=%d bitrate=%d block_align=%d\n",
00222 s->version, s->nb_channels, s->sample_rate, s->bit_rate,
00223 s->block_align);
00224 dprintf(s->avctx, "bps=%f bps1=%f high_freq=%f bitoffset=%d\n",
00225 bps, bps1, high_freq, s->byte_offset_bits);
00226 dprintf(s->avctx, "use_noise_coding=%d use_exp_vlc=%d nb_block_sizes=%d\n",
00227 s->use_noise_coding, s->use_exp_vlc, s->nb_block_sizes);
00228
00229
00230 {
00231 int a, b, pos, lpos, k, block_len, i, j, n;
00232 const uint8_t *table;
00233
00234 if (s->version == 1) {
00235 s->coefs_start = 3;
00236 } else {
00237 s->coefs_start = 0;
00238 }
00239 for (k = 0; k < s->nb_block_sizes; k++) {
00240 block_len = s->frame_len >> k;
00241
00242 if (s->version == 1) {
00243 lpos = 0;
00244 for (i = 0; i < 25; i++) {
00245 a = ff_wma_critical_freqs[i];
00246 b = s->sample_rate;
00247 pos = ((block_len * 2 * a) + (b >> 1)) / b;
00248 if (pos > block_len)
00249 pos = block_len;
00250 s->exponent_bands[0][i] = pos - lpos;
00251 if (pos >= block_len) {
00252 i++;
00253 break;
00254 }
00255 lpos = pos;
00256 }
00257 s->exponent_sizes[0] = i;
00258 } else {
00259
00260 table = NULL;
00261 a = s->frame_len_bits - BLOCK_MIN_BITS - k;
00262 if (a < 3) {
00263 if (s->sample_rate >= 44100) {
00264 table = exponent_band_44100[a];
00265 } else if (s->sample_rate >= 32000) {
00266 table = exponent_band_32000[a];
00267 } else if (s->sample_rate >= 22050) {
00268 table = exponent_band_22050[a];
00269 }
00270 }
00271 if (table) {
00272 n = *table++;
00273 for (i = 0; i < n; i++)
00274 s->exponent_bands[k][i] = table[i];
00275 s->exponent_sizes[k] = n;
00276 } else {
00277 j = 0;
00278 lpos = 0;
00279 for (i = 0; i < 25; i++) {
00280 a = ff_wma_critical_freqs[i];
00281 b = s->sample_rate;
00282 pos = ((block_len * 2 * a) + (b << 1)) / (4 * b);
00283 pos <<= 2;
00284 if (pos > block_len)
00285 pos = block_len;
00286 if (pos > lpos)
00287 s->exponent_bands[k][j++] = pos - lpos;
00288 if (pos >= block_len)
00289 break;
00290 lpos = pos;
00291 }
00292 s->exponent_sizes[k] = j;
00293 }
00294 }
00295
00296
00297 s->coefs_end[k] = (s->frame_len - ((s->frame_len * 9) / 100)) >> k;
00298
00299 s->high_band_start[k] = (int)((block_len * 2 * high_freq) /
00300 s->sample_rate + 0.5);
00301 n = s->exponent_sizes[k];
00302 j = 0;
00303 pos = 0;
00304 for (i = 0; i < n; i++) {
00305 int start, end;
00306 start = pos;
00307 pos += s->exponent_bands[k][i];
00308 end = pos;
00309 if (start < s->high_band_start[k])
00310 start = s->high_band_start[k];
00311 if (end > s->coefs_end[k])
00312 end = s->coefs_end[k];
00313 if (end > start)
00314 s->exponent_high_bands[k][j++] = end - start;
00315 }
00316 s->exponent_high_sizes[k] = j;
00317 #if 0
00318 tprintf(s->avctx, "%5d: coefs_end=%d high_band_start=%d nb_high_bands=%d: ",
00319 s->frame_len >> k,
00320 s->coefs_end[k],
00321 s->high_band_start[k],
00322 s->exponent_high_sizes[k]);
00323 for (j = 0; j < s->exponent_high_sizes[k]; j++)
00324 tprintf(s->avctx, " %d", s->exponent_high_bands[k][j]);
00325 tprintf(s->avctx, "\n");
00326 #endif
00327 }
00328 }
00329
00330 #ifdef TRACE
00331 {
00332 int i, j;
00333 for (i = 0; i < s->nb_block_sizes; i++) {
00334 tprintf(s->avctx, "%5d: n=%2d:",
00335 s->frame_len >> i,
00336 s->exponent_sizes[i]);
00337 for (j = 0; j < s->exponent_sizes[i]; j++)
00338 tprintf(s->avctx, " %d", s->exponent_bands[i][j]);
00339 tprintf(s->avctx, "\n");
00340 }
00341 }
00342 #endif
00343
00344
00345 for (i = 0; i < s->nb_block_sizes; i++) {
00346 ff_init_ff_sine_windows(s->frame_len_bits - i);
00347 s->windows[i] = ff_sine_windows[s->frame_len_bits - i];
00348 }
00349
00350 s->reset_block_lengths = 1;
00351
00352 if (s->use_noise_coding) {
00353
00354
00355 if (s->use_exp_vlc) {
00356 s->noise_mult = 0.02;
00357 } else {
00358 s->noise_mult = 0.04;
00359 }
00360
00361 #ifdef TRACE
00362 for (i = 0; i < NOISE_TAB_SIZE; i++)
00363 s->noise_table[i] = 1.0 * s->noise_mult;
00364 #else
00365 {
00366 unsigned int seed;
00367 float norm;
00368 seed = 1;
00369 norm = (1.0 / (float)(1LL << 31)) * sqrt(3) * s->noise_mult;
00370 for (i = 0; i < NOISE_TAB_SIZE; i++) {
00371 seed = seed * 314159 + 1;
00372 s->noise_table[i] = (float)((int)seed) * norm;
00373 }
00374 }
00375 #endif
00376 }
00377
00378
00379 coef_vlc_table = 2;
00380 if (s->sample_rate >= 32000) {
00381 if (bps1 < 0.72) {
00382 coef_vlc_table = 0;
00383 } else if (bps1 < 1.16) {
00384 coef_vlc_table = 1;
00385 }
00386 }
00387 s->coef_vlcs[0]= &coef_vlcs[coef_vlc_table * 2 ];
00388 s->coef_vlcs[1]= &coef_vlcs[coef_vlc_table * 2 + 1];
00389 init_coef_vlc(&s->coef_vlc[0], &s->run_table[0], &s->level_table[0], &s->int_table[0],
00390 s->coef_vlcs[0]);
00391 init_coef_vlc(&s->coef_vlc[1], &s->run_table[1], &s->level_table[1], &s->int_table[1],
00392 s->coef_vlcs[1]);
00393
00394 return 0;
00395 }
00396
00397 int ff_wma_total_gain_to_bits(int total_gain)
00398 {
00399 if (total_gain < 15) return 13;
00400 else if (total_gain < 32) return 12;
00401 else if (total_gain < 40) return 11;
00402 else if (total_gain < 45) return 10;
00403 else return 9;
00404 }
00405
00406 int ff_wma_end(AVCodecContext *avctx)
00407 {
00408 WMACodecContext *s = avctx->priv_data;
00409 int i;
00410
00411 for (i = 0; i < s->nb_block_sizes; i++)
00412 ff_mdct_end(&s->mdct_ctx[i]);
00413
00414 if (s->use_exp_vlc) {
00415 free_vlc(&s->exp_vlc);
00416 }
00417 if (s->use_noise_coding) {
00418 free_vlc(&s->hgain_vlc);
00419 }
00420 for (i = 0; i < 2; i++) {
00421 free_vlc(&s->coef_vlc[i]);
00422 av_free(s->run_table[i]);
00423 av_free(s->level_table[i]);
00424 av_free(s->int_table[i]);
00425 }
00426
00427 return 0;
00428 }
00429
00435 unsigned int ff_wma_get_large_val(GetBitContext* gb)
00436 {
00438 int n_bits = 8;
00440 if (get_bits1(gb)) {
00441 n_bits += 8;
00442 if (get_bits1(gb)) {
00443 n_bits += 8;
00444 if (get_bits1(gb)) {
00445 n_bits += 7;
00446 }
00447 }
00448 }
00449 return get_bits_long(gb, n_bits);
00450 }
00451
00468 int ff_wma_run_level_decode(AVCodecContext* avctx, GetBitContext* gb,
00469 VLC *vlc,
00470 const float *level_table, const uint16_t *run_table,
00471 int version, WMACoef *ptr, int offset,
00472 int num_coefs, int block_len, int frame_len_bits,
00473 int coef_nb_bits)
00474 {
00475 int code, level, sign;
00476 const uint32_t *ilvl = (const uint32_t*)level_table;
00477 uint32_t *iptr = (uint32_t*)ptr;
00478 const unsigned int coef_mask = block_len - 1;
00479 for (; offset < num_coefs; offset++) {
00480 code = get_vlc2(gb, vlc->table, VLCBITS, VLCMAX);
00481 if (code > 1) {
00483 offset += run_table[code];
00484 sign = get_bits1(gb) - 1;
00485 iptr[offset & coef_mask] = ilvl[code] ^ sign<<31;
00486 } else if (code == 1) {
00488 break;
00489 } else {
00491 if (!version) {
00492 level = get_bits(gb, coef_nb_bits);
00495 offset += get_bits(gb, frame_len_bits);
00496 } else {
00497 level = ff_wma_get_large_val(gb);
00499 if (get_bits1(gb)) {
00500 if (get_bits1(gb)) {
00501 if (get_bits1(gb)) {
00502 av_log(avctx,AV_LOG_ERROR,
00503 "broken escape sequence\n");
00504 return -1;
00505 } else
00506 offset += get_bits(gb, frame_len_bits) + 4;
00507 } else
00508 offset += get_bits(gb, 2) + 1;
00509 }
00510 }
00511 sign = get_bits1(gb) - 1;
00512 ptr[offset & coef_mask] = (level^sign) - sign;
00513 }
00514 }
00516 if (offset > num_coefs) {
00517 av_log(avctx, AV_LOG_ERROR, "overflow in spectral RLE, ignoring\n");
00518 return -1;
00519 }
00520
00521 return 0;
00522 }
00523