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00022 #include "avcodec.h"
00023 #include "sinewin.h"
00024 #include "wma.h"
00025 #include "wmadata.h"
00026
00027 #undef NDEBUG
00028 #include <assert.h>
00029
00030
00031
00032 static void init_coef_vlc(VLC *vlc, uint16_t **prun_table,
00033 float **plevel_table, uint16_t **pint_table,
00034 const CoefVLCTable *vlc_table)
00035 {
00036 int n = vlc_table->n;
00037 const uint8_t *table_bits = vlc_table->huffbits;
00038 const uint32_t *table_codes = vlc_table->huffcodes;
00039 const uint16_t *levels_table = vlc_table->levels;
00040 uint16_t *run_table, *level_table, *int_table;
00041 float *flevel_table;
00042 int i, l, j, k, level;
00043
00044 init_vlc(vlc, VLCBITS, n, table_bits, 1, 1, table_codes, 4, 4, 0);
00045
00046 run_table = av_malloc(n * sizeof(uint16_t));
00047 level_table = av_malloc(n * sizeof(uint16_t));
00048 flevel_table= av_malloc(n * sizeof(*flevel_table));
00049 int_table = av_malloc(n * sizeof(uint16_t));
00050 i = 2;
00051 level = 1;
00052 k = 0;
00053 while (i < n) {
00054 int_table[k] = i;
00055 l = levels_table[k++];
00056 for (j = 0; j < l; j++) {
00057 run_table[i] = j;
00058 level_table[i] = level;
00059 flevel_table[i]= level;
00060 i++;
00061 }
00062 level++;
00063 }
00064 *prun_table = run_table;
00065 *plevel_table = flevel_table;
00066 *pint_table = int_table;
00067 av_free(level_table);
00068 }
00069
00077 int av_cold ff_wma_get_frame_len_bits(int sample_rate, int version,
00078 unsigned int decode_flags)
00079 {
00080
00081 int frame_len_bits;
00082
00083 if (sample_rate <= 16000) {
00084 frame_len_bits = 9;
00085 } else if (sample_rate <= 22050 ||
00086 (sample_rate <= 32000 && version == 1)) {
00087 frame_len_bits = 10;
00088 } else if (sample_rate <= 48000 || version < 3) {
00089 frame_len_bits = 11;
00090 } else if (sample_rate <= 96000) {
00091 frame_len_bits = 12;
00092 } else {
00093 frame_len_bits = 13;
00094 }
00095
00096 if (version == 3) {
00097 int tmp = decode_flags & 0x6;
00098 if (tmp == 0x2) {
00099 ++frame_len_bits;
00100 } else if (tmp == 0x4) {
00101 --frame_len_bits;
00102 } else if (tmp == 0x6) {
00103 frame_len_bits -= 2;
00104 }
00105 }
00106
00107 return frame_len_bits;
00108 }
00109
00110 int ff_wma_init(AVCodecContext *avctx, int flags2)
00111 {
00112 WMACodecContext *s = avctx->priv_data;
00113 int i;
00114 float bps1, high_freq;
00115 volatile float bps;
00116 int sample_rate1;
00117 int coef_vlc_table;
00118
00119 if ( avctx->sample_rate <= 0 || avctx->sample_rate > 50000
00120 || avctx->channels <= 0 || avctx->channels > 8
00121 || avctx->bit_rate <= 0)
00122 return -1;
00123
00124 s->sample_rate = avctx->sample_rate;
00125 s->nb_channels = avctx->channels;
00126 s->bit_rate = avctx->bit_rate;
00127 s->block_align = avctx->block_align;
00128
00129 dsputil_init(&s->dsp, avctx);
00130 ff_fmt_convert_init(&s->fmt_conv, avctx);
00131
00132 if (avctx->codec->id == CODEC_ID_WMAV1) {
00133 s->version = 1;
00134 } else {
00135 s->version = 2;
00136 }
00137
00138
00139 s->frame_len_bits = ff_wma_get_frame_len_bits(s->sample_rate, s->version, 0);
00140 s->next_block_len_bits = s->frame_len_bits;
00141 s->prev_block_len_bits = s->frame_len_bits;
00142 s->block_len_bits = s->frame_len_bits;
00143
00144 s->frame_len = 1 << s->frame_len_bits;
00145 if (s->use_variable_block_len) {
00146 int nb_max, nb;
00147 nb = ((flags2 >> 3) & 3) + 1;
00148 if ((s->bit_rate / s->nb_channels) >= 32000)
00149 nb += 2;
00150 nb_max = s->frame_len_bits - BLOCK_MIN_BITS;
00151 if (nb > nb_max)
00152 nb = nb_max;
00153 s->nb_block_sizes = nb + 1;
00154 } else {
00155 s->nb_block_sizes = 1;
00156 }
00157
00158
00159 s->use_noise_coding = 1;
00160 high_freq = s->sample_rate * 0.5;
00161
00162
00163 sample_rate1 = s->sample_rate;
00164 if (s->version == 2) {
00165 if (sample_rate1 >= 44100) {
00166 sample_rate1 = 44100;
00167 } else if (sample_rate1 >= 22050) {
00168 sample_rate1 = 22050;
00169 } else if (sample_rate1 >= 16000) {
00170 sample_rate1 = 16000;
00171 } else if (sample_rate1 >= 11025) {
00172 sample_rate1 = 11025;
00173 } else if (sample_rate1 >= 8000) {
00174 sample_rate1 = 8000;
00175 }
00176 }
00177
00178 bps = (float)s->bit_rate / (float)(s->nb_channels * s->sample_rate);
00179 s->byte_offset_bits = av_log2((int)(bps * s->frame_len / 8.0 + 0.5)) + 2;
00180 if (s->byte_offset_bits + 3 > MIN_CACHE_BITS) {
00181 av_log(avctx, AV_LOG_ERROR, "byte_offset_bits %d is too large\n", s->byte_offset_bits);
00182 return AVERROR_PATCHWELCOME;
00183 }
00184
00185
00186
00187 bps1 = bps;
00188 if (s->nb_channels == 2)
00189 bps1 = bps * 1.6;
00190 if (sample_rate1 == 44100) {
00191 if (bps1 >= 0.61) {
00192 s->use_noise_coding = 0;
00193 } else {
00194 high_freq = high_freq * 0.4;
00195 }
00196 } else if (sample_rate1 == 22050) {
00197 if (bps1 >= 1.16) {
00198 s->use_noise_coding = 0;
00199 } else if (bps1 >= 0.72) {
00200 high_freq = high_freq * 0.7;
00201 } else {
00202 high_freq = high_freq * 0.6;
00203 }
00204 } else if (sample_rate1 == 16000) {
00205 if (bps > 0.5) {
00206 high_freq = high_freq * 0.5;
00207 } else {
00208 high_freq = high_freq * 0.3;
00209 }
00210 } else if (sample_rate1 == 11025) {
00211 high_freq = high_freq * 0.7;
00212 } else if (sample_rate1 == 8000) {
00213 if (bps <= 0.625) {
00214 high_freq = high_freq * 0.5;
00215 } else if (bps > 0.75) {
00216 s->use_noise_coding = 0;
00217 } else {
00218 high_freq = high_freq * 0.65;
00219 }
00220 } else {
00221 if (bps >= 0.8) {
00222 high_freq = high_freq * 0.75;
00223 } else if (bps >= 0.6) {
00224 high_freq = high_freq * 0.6;
00225 } else {
00226 high_freq = high_freq * 0.5;
00227 }
00228 }
00229 av_dlog(s->avctx, "flags2=0x%x\n", flags2);
00230 av_dlog(s->avctx, "version=%d channels=%d sample_rate=%d bitrate=%d block_align=%d\n",
00231 s->version, s->nb_channels, s->sample_rate, s->bit_rate,
00232 s->block_align);
00233 av_dlog(s->avctx, "bps=%f bps1=%f high_freq=%f bitoffset=%d\n",
00234 bps, bps1, high_freq, s->byte_offset_bits);
00235 av_dlog(s->avctx, "use_noise_coding=%d use_exp_vlc=%d nb_block_sizes=%d\n",
00236 s->use_noise_coding, s->use_exp_vlc, s->nb_block_sizes);
00237
00238
00239 {
00240 int a, b, pos, lpos, k, block_len, i, j, n;
00241 const uint8_t *table;
00242
00243 if (s->version == 1) {
00244 s->coefs_start = 3;
00245 } else {
00246 s->coefs_start = 0;
00247 }
00248 for (k = 0; k < s->nb_block_sizes; k++) {
00249 block_len = s->frame_len >> k;
00250
00251 if (s->version == 1) {
00252 lpos = 0;
00253 for (i = 0; i < 25; i++) {
00254 a = ff_wma_critical_freqs[i];
00255 b = s->sample_rate;
00256 pos = ((block_len * 2 * a) + (b >> 1)) / b;
00257 if (pos > block_len)
00258 pos = block_len;
00259 s->exponent_bands[0][i] = pos - lpos;
00260 if (pos >= block_len) {
00261 i++;
00262 break;
00263 }
00264 lpos = pos;
00265 }
00266 s->exponent_sizes[0] = i;
00267 } else {
00268
00269 table = NULL;
00270 a = s->frame_len_bits - BLOCK_MIN_BITS - k;
00271 if (a < 3) {
00272 if (s->sample_rate >= 44100) {
00273 table = exponent_band_44100[a];
00274 } else if (s->sample_rate >= 32000) {
00275 table = exponent_band_32000[a];
00276 } else if (s->sample_rate >= 22050) {
00277 table = exponent_band_22050[a];
00278 }
00279 }
00280 if (table) {
00281 n = *table++;
00282 for (i = 0; i < n; i++)
00283 s->exponent_bands[k][i] = table[i];
00284 s->exponent_sizes[k] = n;
00285 } else {
00286 j = 0;
00287 lpos = 0;
00288 for (i = 0; i < 25; i++) {
00289 a = ff_wma_critical_freqs[i];
00290 b = s->sample_rate;
00291 pos = ((block_len * 2 * a) + (b << 1)) / (4 * b);
00292 pos <<= 2;
00293 if (pos > block_len)
00294 pos = block_len;
00295 if (pos > lpos)
00296 s->exponent_bands[k][j++] = pos - lpos;
00297 if (pos >= block_len)
00298 break;
00299 lpos = pos;
00300 }
00301 s->exponent_sizes[k] = j;
00302 }
00303 }
00304
00305
00306 s->coefs_end[k] = (s->frame_len - ((s->frame_len * 9) / 100)) >> k;
00307
00308 s->high_band_start[k] = (int)((block_len * 2 * high_freq) /
00309 s->sample_rate + 0.5);
00310 n = s->exponent_sizes[k];
00311 j = 0;
00312 pos = 0;
00313 for (i = 0; i < n; i++) {
00314 int start, end;
00315 start = pos;
00316 pos += s->exponent_bands[k][i];
00317 end = pos;
00318 if (start < s->high_band_start[k])
00319 start = s->high_band_start[k];
00320 if (end > s->coefs_end[k])
00321 end = s->coefs_end[k];
00322 if (end > start)
00323 s->exponent_high_bands[k][j++] = end - start;
00324 }
00325 s->exponent_high_sizes[k] = j;
00326 #if 0
00327 tprintf(s->avctx, "%5d: coefs_end=%d high_band_start=%d nb_high_bands=%d: ",
00328 s->frame_len >> k,
00329 s->coefs_end[k],
00330 s->high_band_start[k],
00331 s->exponent_high_sizes[k]);
00332 for (j = 0; j < s->exponent_high_sizes[k]; j++)
00333 tprintf(s->avctx, " %d", s->exponent_high_bands[k][j]);
00334 tprintf(s->avctx, "\n");
00335 #endif
00336 }
00337 }
00338
00339 #ifdef TRACE
00340 {
00341 int i, j;
00342 for (i = 0; i < s->nb_block_sizes; i++) {
00343 tprintf(s->avctx, "%5d: n=%2d:",
00344 s->frame_len >> i,
00345 s->exponent_sizes[i]);
00346 for (j = 0; j < s->exponent_sizes[i]; j++)
00347 tprintf(s->avctx, " %d", s->exponent_bands[i][j]);
00348 tprintf(s->avctx, "\n");
00349 }
00350 }
00351 #endif
00352
00353
00354 for (i = 0; i < s->nb_block_sizes; i++) {
00355 ff_init_ff_sine_windows(s->frame_len_bits - i);
00356 s->windows[i] = ff_sine_windows[s->frame_len_bits - i];
00357 }
00358
00359 s->reset_block_lengths = 1;
00360
00361 if (s->use_noise_coding) {
00362
00363
00364 if (s->use_exp_vlc) {
00365 s->noise_mult = 0.02;
00366 } else {
00367 s->noise_mult = 0.04;
00368 }
00369
00370 #ifdef TRACE
00371 for (i = 0; i < NOISE_TAB_SIZE; i++)
00372 s->noise_table[i] = 1.0 * s->noise_mult;
00373 #else
00374 {
00375 unsigned int seed;
00376 float norm;
00377 seed = 1;
00378 norm = (1.0 / (float)(1LL << 31)) * sqrt(3) * s->noise_mult;
00379 for (i = 0; i < NOISE_TAB_SIZE; i++) {
00380 seed = seed * 314159 + 1;
00381 s->noise_table[i] = (float)((int)seed) * norm;
00382 }
00383 }
00384 #endif
00385 }
00386
00387
00388 coef_vlc_table = 2;
00389 if (s->sample_rate >= 32000) {
00390 if (bps1 < 0.72) {
00391 coef_vlc_table = 0;
00392 } else if (bps1 < 1.16) {
00393 coef_vlc_table = 1;
00394 }
00395 }
00396 s->coef_vlcs[0]= &coef_vlcs[coef_vlc_table * 2 ];
00397 s->coef_vlcs[1]= &coef_vlcs[coef_vlc_table * 2 + 1];
00398 init_coef_vlc(&s->coef_vlc[0], &s->run_table[0], &s->level_table[0], &s->int_table[0],
00399 s->coef_vlcs[0]);
00400 init_coef_vlc(&s->coef_vlc[1], &s->run_table[1], &s->level_table[1], &s->int_table[1],
00401 s->coef_vlcs[1]);
00402
00403 return 0;
00404 }
00405
00406 int ff_wma_total_gain_to_bits(int total_gain)
00407 {
00408 if (total_gain < 15) return 13;
00409 else if (total_gain < 32) return 12;
00410 else if (total_gain < 40) return 11;
00411 else if (total_gain < 45) return 10;
00412 else return 9;
00413 }
00414
00415 int ff_wma_end(AVCodecContext *avctx)
00416 {
00417 WMACodecContext *s = avctx->priv_data;
00418 int i;
00419
00420 for (i = 0; i < s->nb_block_sizes; i++)
00421 ff_mdct_end(&s->mdct_ctx[i]);
00422
00423 if (s->use_exp_vlc) {
00424 free_vlc(&s->exp_vlc);
00425 }
00426 if (s->use_noise_coding) {
00427 free_vlc(&s->hgain_vlc);
00428 }
00429 for (i = 0; i < 2; i++) {
00430 free_vlc(&s->coef_vlc[i]);
00431 av_free(s->run_table[i]);
00432 av_free(s->level_table[i]);
00433 av_free(s->int_table[i]);
00434 }
00435
00436 return 0;
00437 }
00438
00444 unsigned int ff_wma_get_large_val(GetBitContext* gb)
00445 {
00447 int n_bits = 8;
00449 if (get_bits1(gb)) {
00450 n_bits += 8;
00451 if (get_bits1(gb)) {
00452 n_bits += 8;
00453 if (get_bits1(gb)) {
00454 n_bits += 7;
00455 }
00456 }
00457 }
00458 return get_bits_long(gb, n_bits);
00459 }
00460
00477 int ff_wma_run_level_decode(AVCodecContext* avctx, GetBitContext* gb,
00478 VLC *vlc,
00479 const float *level_table, const uint16_t *run_table,
00480 int version, WMACoef *ptr, int offset,
00481 int num_coefs, int block_len, int frame_len_bits,
00482 int coef_nb_bits)
00483 {
00484 int code, level, sign;
00485 const uint32_t *ilvl = (const uint32_t*)level_table;
00486 uint32_t *iptr = (uint32_t*)ptr;
00487 const unsigned int coef_mask = block_len - 1;
00488 for (; offset < num_coefs; offset++) {
00489 code = get_vlc2(gb, vlc->table, VLCBITS, VLCMAX);
00490 if (code > 1) {
00492 offset += run_table[code];
00493 sign = get_bits1(gb) - 1;
00494 iptr[offset & coef_mask] = ilvl[code] ^ sign<<31;
00495 } else if (code == 1) {
00497 break;
00498 } else {
00500 if (!version) {
00501 level = get_bits(gb, coef_nb_bits);
00504 offset += get_bits(gb, frame_len_bits);
00505 } else {
00506 level = ff_wma_get_large_val(gb);
00508 if (get_bits1(gb)) {
00509 if (get_bits1(gb)) {
00510 if (get_bits1(gb)) {
00511 av_log(avctx,AV_LOG_ERROR,
00512 "broken escape sequence\n");
00513 return -1;
00514 } else
00515 offset += get_bits(gb, frame_len_bits) + 4;
00516 } else
00517 offset += get_bits(gb, 2) + 1;
00518 }
00519 }
00520 sign = get_bits1(gb) - 1;
00521 ptr[offset & coef_mask] = (level^sign) - sign;
00522 }
00523 }
00525 if (offset > num_coefs) {
00526 av_log(avctx, AV_LOG_ERROR, "overflow in spectral RLE, ignoring\n");
00527 return -1;
00528 }
00529
00530 return 0;
00531 }
00532