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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 ff_fmt_convert_init(&s->fmt_conv, avctx);
00130
00131 if (avctx->codec->id == CODEC_ID_WMAV1) {
00132 s->version = 1;
00133 } else {
00134 s->version = 2;
00135 }
00136
00137
00138 s->frame_len_bits = ff_wma_get_frame_len_bits(s->sample_rate, s->version, 0);
00139
00140 s->frame_len = 1 << s->frame_len_bits;
00141 if (s->use_variable_block_len) {
00142 int nb_max, nb;
00143 nb = ((flags2 >> 3) & 3) + 1;
00144 if ((s->bit_rate / s->nb_channels) >= 32000)
00145 nb += 2;
00146 nb_max = s->frame_len_bits - BLOCK_MIN_BITS;
00147 if (nb > nb_max)
00148 nb = nb_max;
00149 s->nb_block_sizes = nb + 1;
00150 } else {
00151 s->nb_block_sizes = 1;
00152 }
00153
00154
00155 s->use_noise_coding = 1;
00156 high_freq = s->sample_rate * 0.5;
00157
00158
00159 sample_rate1 = s->sample_rate;
00160 if (s->version == 2) {
00161 if (sample_rate1 >= 44100) {
00162 sample_rate1 = 44100;
00163 } else if (sample_rate1 >= 22050) {
00164 sample_rate1 = 22050;
00165 } else if (sample_rate1 >= 16000) {
00166 sample_rate1 = 16000;
00167 } else if (sample_rate1 >= 11025) {
00168 sample_rate1 = 11025;
00169 } else if (sample_rate1 >= 8000) {
00170 sample_rate1 = 8000;
00171 }
00172 }
00173
00174 bps = (float)s->bit_rate / (float)(s->nb_channels * s->sample_rate);
00175 s->byte_offset_bits = av_log2((int)(bps * s->frame_len / 8.0 + 0.5)) + 2;
00176
00177
00178
00179 bps1 = bps;
00180 if (s->nb_channels == 2)
00181 bps1 = bps * 1.6;
00182 if (sample_rate1 == 44100) {
00183 if (bps1 >= 0.61) {
00184 s->use_noise_coding = 0;
00185 } else {
00186 high_freq = high_freq * 0.4;
00187 }
00188 } else if (sample_rate1 == 22050) {
00189 if (bps1 >= 1.16) {
00190 s->use_noise_coding = 0;
00191 } else if (bps1 >= 0.72) {
00192 high_freq = high_freq * 0.7;
00193 } else {
00194 high_freq = high_freq * 0.6;
00195 }
00196 } else if (sample_rate1 == 16000) {
00197 if (bps > 0.5) {
00198 high_freq = high_freq * 0.5;
00199 } else {
00200 high_freq = high_freq * 0.3;
00201 }
00202 } else if (sample_rate1 == 11025) {
00203 high_freq = high_freq * 0.7;
00204 } else if (sample_rate1 == 8000) {
00205 if (bps <= 0.625) {
00206 high_freq = high_freq * 0.5;
00207 } else if (bps > 0.75) {
00208 s->use_noise_coding = 0;
00209 } else {
00210 high_freq = high_freq * 0.65;
00211 }
00212 } else {
00213 if (bps >= 0.8) {
00214 high_freq = high_freq * 0.75;
00215 } else if (bps >= 0.6) {
00216 high_freq = high_freq * 0.6;
00217 } else {
00218 high_freq = high_freq * 0.5;
00219 }
00220 }
00221 av_dlog(s->avctx, "flags2=0x%x\n", flags2);
00222 av_dlog(s->avctx, "version=%d channels=%d sample_rate=%d bitrate=%d block_align=%d\n",
00223 s->version, s->nb_channels, s->sample_rate, s->bit_rate,
00224 s->block_align);
00225 av_dlog(s->avctx, "bps=%f bps1=%f high_freq=%f bitoffset=%d\n",
00226 bps, bps1, high_freq, s->byte_offset_bits);
00227 av_dlog(s->avctx, "use_noise_coding=%d use_exp_vlc=%d nb_block_sizes=%d\n",
00228 s->use_noise_coding, s->use_exp_vlc, s->nb_block_sizes);
00229
00230
00231 {
00232 int a, b, pos, lpos, k, block_len, i, j, n;
00233 const uint8_t *table;
00234
00235 if (s->version == 1) {
00236 s->coefs_start = 3;
00237 } else {
00238 s->coefs_start = 0;
00239 }
00240 for (k = 0; k < s->nb_block_sizes; k++) {
00241 block_len = s->frame_len >> k;
00242
00243 if (s->version == 1) {
00244 lpos = 0;
00245 for (i = 0; i < 25; i++) {
00246 a = ff_wma_critical_freqs[i];
00247 b = s->sample_rate;
00248 pos = ((block_len * 2 * a) + (b >> 1)) / b;
00249 if (pos > block_len)
00250 pos = block_len;
00251 s->exponent_bands[0][i] = pos - lpos;
00252 if (pos >= block_len) {
00253 i++;
00254 break;
00255 }
00256 lpos = pos;
00257 }
00258 s->exponent_sizes[0] = i;
00259 } else {
00260
00261 table = NULL;
00262 a = s->frame_len_bits - BLOCK_MIN_BITS - k;
00263 if (a < 3) {
00264 if (s->sample_rate >= 44100) {
00265 table = exponent_band_44100[a];
00266 } else if (s->sample_rate >= 32000) {
00267 table = exponent_band_32000[a];
00268 } else if (s->sample_rate >= 22050) {
00269 table = exponent_band_22050[a];
00270 }
00271 }
00272 if (table) {
00273 n = *table++;
00274 for (i = 0; i < n; i++)
00275 s->exponent_bands[k][i] = table[i];
00276 s->exponent_sizes[k] = n;
00277 } else {
00278 j = 0;
00279 lpos = 0;
00280 for (i = 0; i < 25; i++) {
00281 a = ff_wma_critical_freqs[i];
00282 b = s->sample_rate;
00283 pos = ((block_len * 2 * a) + (b << 1)) / (4 * b);
00284 pos <<= 2;
00285 if (pos > block_len)
00286 pos = block_len;
00287 if (pos > lpos)
00288 s->exponent_bands[k][j++] = pos - lpos;
00289 if (pos >= block_len)
00290 break;
00291 lpos = pos;
00292 }
00293 s->exponent_sizes[k] = j;
00294 }
00295 }
00296
00297
00298 s->coefs_end[k] = (s->frame_len - ((s->frame_len * 9) / 100)) >> k;
00299
00300 s->high_band_start[k] = (int)((block_len * 2 * high_freq) /
00301 s->sample_rate + 0.5);
00302 n = s->exponent_sizes[k];
00303 j = 0;
00304 pos = 0;
00305 for (i = 0; i < n; i++) {
00306 int start, end;
00307 start = pos;
00308 pos += s->exponent_bands[k][i];
00309 end = pos;
00310 if (start < s->high_band_start[k])
00311 start = s->high_band_start[k];
00312 if (end > s->coefs_end[k])
00313 end = s->coefs_end[k];
00314 if (end > start)
00315 s->exponent_high_bands[k][j++] = end - start;
00316 }
00317 s->exponent_high_sizes[k] = j;
00318 #if 0
00319 tprintf(s->avctx, "%5d: coefs_end=%d high_band_start=%d nb_high_bands=%d: ",
00320 s->frame_len >> k,
00321 s->coefs_end[k],
00322 s->high_band_start[k],
00323 s->exponent_high_sizes[k]);
00324 for (j = 0; j < s->exponent_high_sizes[k]; j++)
00325 tprintf(s->avctx, " %d", s->exponent_high_bands[k][j]);
00326 tprintf(s->avctx, "\n");
00327 #endif
00328 }
00329 }
00330
00331 #ifdef TRACE
00332 {
00333 int i, j;
00334 for (i = 0; i < s->nb_block_sizes; i++) {
00335 tprintf(s->avctx, "%5d: n=%2d:",
00336 s->frame_len >> i,
00337 s->exponent_sizes[i]);
00338 for (j = 0; j < s->exponent_sizes[i]; j++)
00339 tprintf(s->avctx, " %d", s->exponent_bands[i][j]);
00340 tprintf(s->avctx, "\n");
00341 }
00342 }
00343 #endif
00344
00345
00346 for (i = 0; i < s->nb_block_sizes; i++) {
00347 ff_init_ff_sine_windows(s->frame_len_bits - i);
00348 s->windows[i] = ff_sine_windows[s->frame_len_bits - i];
00349 }
00350
00351 s->reset_block_lengths = 1;
00352
00353 if (s->use_noise_coding) {
00354
00355
00356 if (s->use_exp_vlc) {
00357 s->noise_mult = 0.02;
00358 } else {
00359 s->noise_mult = 0.04;
00360 }
00361
00362 #ifdef TRACE
00363 for (i = 0; i < NOISE_TAB_SIZE; i++)
00364 s->noise_table[i] = 1.0 * s->noise_mult;
00365 #else
00366 {
00367 unsigned int seed;
00368 float norm;
00369 seed = 1;
00370 norm = (1.0 / (float)(1LL << 31)) * sqrt(3) * s->noise_mult;
00371 for (i = 0; i < NOISE_TAB_SIZE; i++) {
00372 seed = seed * 314159 + 1;
00373 s->noise_table[i] = (float)((int)seed) * norm;
00374 }
00375 }
00376 #endif
00377 }
00378
00379
00380 coef_vlc_table = 2;
00381 if (s->sample_rate >= 32000) {
00382 if (bps1 < 0.72) {
00383 coef_vlc_table = 0;
00384 } else if (bps1 < 1.16) {
00385 coef_vlc_table = 1;
00386 }
00387 }
00388 s->coef_vlcs[0]= &coef_vlcs[coef_vlc_table * 2 ];
00389 s->coef_vlcs[1]= &coef_vlcs[coef_vlc_table * 2 + 1];
00390 init_coef_vlc(&s->coef_vlc[0], &s->run_table[0], &s->level_table[0], &s->int_table[0],
00391 s->coef_vlcs[0]);
00392 init_coef_vlc(&s->coef_vlc[1], &s->run_table[1], &s->level_table[1], &s->int_table[1],
00393 s->coef_vlcs[1]);
00394
00395 return 0;
00396 }
00397
00398 int ff_wma_total_gain_to_bits(int total_gain)
00399 {
00400 if (total_gain < 15) return 13;
00401 else if (total_gain < 32) return 12;
00402 else if (total_gain < 40) return 11;
00403 else if (total_gain < 45) return 10;
00404 else return 9;
00405 }
00406
00407 int ff_wma_end(AVCodecContext *avctx)
00408 {
00409 WMACodecContext *s = avctx->priv_data;
00410 int i;
00411
00412 for (i = 0; i < s->nb_block_sizes; i++)
00413 ff_mdct_end(&s->mdct_ctx[i]);
00414
00415 if (s->use_exp_vlc) {
00416 free_vlc(&s->exp_vlc);
00417 }
00418 if (s->use_noise_coding) {
00419 free_vlc(&s->hgain_vlc);
00420 }
00421 for (i = 0; i < 2; i++) {
00422 free_vlc(&s->coef_vlc[i]);
00423 av_free(s->run_table[i]);
00424 av_free(s->level_table[i]);
00425 av_free(s->int_table[i]);
00426 }
00427
00428 return 0;
00429 }
00430
00436 unsigned int ff_wma_get_large_val(GetBitContext* gb)
00437 {
00439 int n_bits = 8;
00441 if (get_bits1(gb)) {
00442 n_bits += 8;
00443 if (get_bits1(gb)) {
00444 n_bits += 8;
00445 if (get_bits1(gb)) {
00446 n_bits += 7;
00447 }
00448 }
00449 }
00450 return get_bits_long(gb, n_bits);
00451 }
00452
00469 int ff_wma_run_level_decode(AVCodecContext* avctx, GetBitContext* gb,
00470 VLC *vlc,
00471 const float *level_table, const uint16_t *run_table,
00472 int version, WMACoef *ptr, int offset,
00473 int num_coefs, int block_len, int frame_len_bits,
00474 int coef_nb_bits)
00475 {
00476 int code, level, sign;
00477 const uint32_t *ilvl = (const uint32_t*)level_table;
00478 uint32_t *iptr = (uint32_t*)ptr;
00479 const unsigned int coef_mask = block_len - 1;
00480 for (; offset < num_coefs; offset++) {
00481 code = get_vlc2(gb, vlc->table, VLCBITS, VLCMAX);
00482 if (code > 1) {
00484 offset += run_table[code];
00485 sign = get_bits1(gb) - 1;
00486 iptr[offset & coef_mask] = ilvl[code] ^ sign<<31;
00487 } else if (code == 1) {
00489 break;
00490 } else {
00492 if (!version) {
00493 level = get_bits(gb, coef_nb_bits);
00496 offset += get_bits(gb, frame_len_bits);
00497 } else {
00498 level = ff_wma_get_large_val(gb);
00500 if (get_bits1(gb)) {
00501 if (get_bits1(gb)) {
00502 if (get_bits1(gb)) {
00503 av_log(avctx,AV_LOG_ERROR,
00504 "broken escape sequence\n");
00505 return -1;
00506 } else
00507 offset += get_bits(gb, frame_len_bits) + 4;
00508 } else
00509 offset += get_bits(gb, 2) + 1;
00510 }
00511 }
00512 sign = get_bits1(gb) - 1;
00513 ptr[offset & coef_mask] = (level^sign) - sign;
00514 }
00515 }
00517 if (offset > num_coefs) {
00518 av_log(avctx, AV_LOG_ERROR, "overflow in spectral RLE, ignoring\n");
00519 return -1;
00520 }
00521
00522 return 0;
00523 }
00524