Libav 0.7.1
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00001 /* 00002 * copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org> 00003 * 00004 * This file is part of Libav. 00005 * 00006 * Libav is free software; you can redistribute it and/or 00007 * modify it under the terms of the GNU Lesser General Public 00008 * License as published by the Free Software Foundation; either 00009 * version 2.1 of the License, or (at your option) any later version. 00010 * 00011 * Libav is distributed in the hope that it will be useful, 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00014 * Lesser General Public License for more details. 00015 * 00016 * You should have received a copy of the GNU Lesser General Public 00017 * License along with Libav; if not, write to the Free Software 00018 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00019 */ 00020 00027 #include <float.h> 00028 #include "avcodec.h" 00029 #include "dsputil.h" 00030 #include "fft.h" 00031 #include "vorbis.h" 00032 #include "vorbis_enc_data.h" 00033 00034 #define BITSTREAM_WRITER_LE 00035 #include "put_bits.h" 00036 00037 #undef NDEBUG 00038 #include <assert.h> 00039 00040 typedef struct { 00041 int nentries; 00042 uint8_t *lens; 00043 uint32_t *codewords; 00044 int ndimentions; 00045 float min; 00046 float delta; 00047 int seq_p; 00048 int lookup; 00049 int *quantlist; 00050 float *dimentions; 00051 float *pow2; 00052 } vorbis_enc_codebook; 00053 00054 typedef struct { 00055 int dim; 00056 int subclass; 00057 int masterbook; 00058 int *books; 00059 } vorbis_enc_floor_class; 00060 00061 typedef struct { 00062 int partitions; 00063 int *partition_to_class; 00064 int nclasses; 00065 vorbis_enc_floor_class *classes; 00066 int multiplier; 00067 int rangebits; 00068 int values; 00069 vorbis_floor1_entry *list; 00070 } vorbis_enc_floor; 00071 00072 typedef struct { 00073 int type; 00074 int begin; 00075 int end; 00076 int partition_size; 00077 int classifications; 00078 int classbook; 00079 int8_t (*books)[8]; 00080 float (*maxes)[2]; 00081 } vorbis_enc_residue; 00082 00083 typedef struct { 00084 int submaps; 00085 int *mux; 00086 int *floor; 00087 int *residue; 00088 int coupling_steps; 00089 int *magnitude; 00090 int *angle; 00091 } vorbis_enc_mapping; 00092 00093 typedef struct { 00094 int blockflag; 00095 int mapping; 00096 } vorbis_enc_mode; 00097 00098 typedef struct { 00099 int channels; 00100 int sample_rate; 00101 int log2_blocksize[2]; 00102 FFTContext mdct[2]; 00103 const float *win[2]; 00104 int have_saved; 00105 float *saved; 00106 float *samples; 00107 float *floor; // also used for tmp values for mdct 00108 float *coeffs; // also used for residue after floor 00109 float quality; 00110 00111 int ncodebooks; 00112 vorbis_enc_codebook *codebooks; 00113 00114 int nfloors; 00115 vorbis_enc_floor *floors; 00116 00117 int nresidues; 00118 vorbis_enc_residue *residues; 00119 00120 int nmappings; 00121 vorbis_enc_mapping *mappings; 00122 00123 int nmodes; 00124 vorbis_enc_mode *modes; 00125 00126 int64_t sample_count; 00127 } vorbis_enc_context; 00128 00129 #define MAX_CHANNELS 2 00130 #define MAX_CODEBOOK_DIM 8 00131 00132 #define MAX_FLOOR_CLASS_DIM 4 00133 #define NUM_FLOOR_PARTITIONS 8 00134 #define MAX_FLOOR_VALUES (MAX_FLOOR_CLASS_DIM*NUM_FLOOR_PARTITIONS+2) 00135 00136 #define RESIDUE_SIZE 1600 00137 #define RESIDUE_PART_SIZE 32 00138 #define NUM_RESIDUE_PARTITIONS (RESIDUE_SIZE/RESIDUE_PART_SIZE) 00139 00140 static inline void put_codeword(PutBitContext *pb, vorbis_enc_codebook *cb, 00141 int entry) 00142 { 00143 assert(entry >= 0); 00144 assert(entry < cb->nentries); 00145 assert(cb->lens[entry]); 00146 put_bits(pb, cb->lens[entry], cb->codewords[entry]); 00147 } 00148 00149 static int cb_lookup_vals(int lookup, int dimentions, int entries) 00150 { 00151 if (lookup == 1) 00152 return ff_vorbis_nth_root(entries, dimentions); 00153 else if (lookup == 2) 00154 return dimentions *entries; 00155 return 0; 00156 } 00157 00158 static void ready_codebook(vorbis_enc_codebook *cb) 00159 { 00160 int i; 00161 00162 ff_vorbis_len2vlc(cb->lens, cb->codewords, cb->nentries); 00163 00164 if (!cb->lookup) { 00165 cb->pow2 = cb->dimentions = NULL; 00166 } else { 00167 int vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries); 00168 cb->dimentions = av_malloc(sizeof(float) * cb->nentries * cb->ndimentions); 00169 cb->pow2 = av_mallocz(sizeof(float) * cb->nentries); 00170 for (i = 0; i < cb->nentries; i++) { 00171 float last = 0; 00172 int j; 00173 int div = 1; 00174 for (j = 0; j < cb->ndimentions; j++) { 00175 int off; 00176 if (cb->lookup == 1) 00177 off = (i / div) % vals; // lookup type 1 00178 else 00179 off = i * cb->ndimentions + j; // lookup type 2 00180 00181 cb->dimentions[i * cb->ndimentions + j] = last + cb->min + cb->quantlist[off] * cb->delta; 00182 if (cb->seq_p) 00183 last = cb->dimentions[i * cb->ndimentions + j]; 00184 cb->pow2[i] += cb->dimentions[i * cb->ndimentions + j] * cb->dimentions[i * cb->ndimentions + j]; 00185 div *= vals; 00186 } 00187 cb->pow2[i] /= 2.; 00188 } 00189 } 00190 } 00191 00192 static void ready_residue(vorbis_enc_residue *rc, vorbis_enc_context *venc) 00193 { 00194 int i; 00195 assert(rc->type == 2); 00196 rc->maxes = av_mallocz(sizeof(float[2]) * rc->classifications); 00197 for (i = 0; i < rc->classifications; i++) { 00198 int j; 00199 vorbis_enc_codebook * cb; 00200 for (j = 0; j < 8; j++) 00201 if (rc->books[i][j] != -1) 00202 break; 00203 if (j == 8) // zero 00204 continue; 00205 cb = &venc->codebooks[rc->books[i][j]]; 00206 assert(cb->ndimentions >= 2); 00207 assert(cb->lookup); 00208 00209 for (j = 0; j < cb->nentries; j++) { 00210 float a; 00211 if (!cb->lens[j]) 00212 continue; 00213 a = fabs(cb->dimentions[j * cb->ndimentions]); 00214 if (a > rc->maxes[i][0]) 00215 rc->maxes[i][0] = a; 00216 a = fabs(cb->dimentions[j * cb->ndimentions + 1]); 00217 if (a > rc->maxes[i][1]) 00218 rc->maxes[i][1] = a; 00219 } 00220 } 00221 // small bias 00222 for (i = 0; i < rc->classifications; i++) { 00223 rc->maxes[i][0] += 0.8; 00224 rc->maxes[i][1] += 0.8; 00225 } 00226 } 00227 00228 static void create_vorbis_context(vorbis_enc_context *venc, 00229 AVCodecContext *avccontext) 00230 { 00231 vorbis_enc_floor *fc; 00232 vorbis_enc_residue *rc; 00233 vorbis_enc_mapping *mc; 00234 int i, book; 00235 00236 venc->channels = avccontext->channels; 00237 venc->sample_rate = avccontext->sample_rate; 00238 venc->log2_blocksize[0] = venc->log2_blocksize[1] = 11; 00239 00240 venc->ncodebooks = FF_ARRAY_ELEMS(cvectors); 00241 venc->codebooks = av_malloc(sizeof(vorbis_enc_codebook) * venc->ncodebooks); 00242 00243 // codebook 0..14 - floor1 book, values 0..255 00244 // codebook 15 residue masterbook 00245 // codebook 16..29 residue 00246 for (book = 0; book < venc->ncodebooks; book++) { 00247 vorbis_enc_codebook *cb = &venc->codebooks[book]; 00248 int vals; 00249 cb->ndimentions = cvectors[book].dim; 00250 cb->nentries = cvectors[book].real_len; 00251 cb->min = cvectors[book].min; 00252 cb->delta = cvectors[book].delta; 00253 cb->lookup = cvectors[book].lookup; 00254 cb->seq_p = 0; 00255 00256 cb->lens = av_malloc(sizeof(uint8_t) * cb->nentries); 00257 cb->codewords = av_malloc(sizeof(uint32_t) * cb->nentries); 00258 memcpy(cb->lens, cvectors[book].clens, cvectors[book].len); 00259 memset(cb->lens + cvectors[book].len, 0, cb->nentries - cvectors[book].len); 00260 00261 if (cb->lookup) { 00262 vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries); 00263 cb->quantlist = av_malloc(sizeof(int) * vals); 00264 for (i = 0; i < vals; i++) 00265 cb->quantlist[i] = cvectors[book].quant[i]; 00266 } else { 00267 cb->quantlist = NULL; 00268 } 00269 ready_codebook(cb); 00270 } 00271 00272 venc->nfloors = 1; 00273 venc->floors = av_malloc(sizeof(vorbis_enc_floor) * venc->nfloors); 00274 00275 // just 1 floor 00276 fc = &venc->floors[0]; 00277 fc->partitions = NUM_FLOOR_PARTITIONS; 00278 fc->partition_to_class = av_malloc(sizeof(int) * fc->partitions); 00279 fc->nclasses = 0; 00280 for (i = 0; i < fc->partitions; i++) { 00281 static const int a[] = {0, 1, 2, 2, 3, 3, 4, 4}; 00282 fc->partition_to_class[i] = a[i]; 00283 fc->nclasses = FFMAX(fc->nclasses, fc->partition_to_class[i]); 00284 } 00285 fc->nclasses++; 00286 fc->classes = av_malloc(sizeof(vorbis_enc_floor_class) * fc->nclasses); 00287 for (i = 0; i < fc->nclasses; i++) { 00288 vorbis_enc_floor_class * c = &fc->classes[i]; 00289 int j, books; 00290 c->dim = floor_classes[i].dim; 00291 c->subclass = floor_classes[i].subclass; 00292 c->masterbook = floor_classes[i].masterbook; 00293 books = (1 << c->subclass); 00294 c->books = av_malloc(sizeof(int) * books); 00295 for (j = 0; j < books; j++) 00296 c->books[j] = floor_classes[i].nbooks[j]; 00297 } 00298 fc->multiplier = 2; 00299 fc->rangebits = venc->log2_blocksize[0] - 1; 00300 00301 fc->values = 2; 00302 for (i = 0; i < fc->partitions; i++) 00303 fc->values += fc->classes[fc->partition_to_class[i]].dim; 00304 00305 fc->list = av_malloc(sizeof(vorbis_floor1_entry) * fc->values); 00306 fc->list[0].x = 0; 00307 fc->list[1].x = 1 << fc->rangebits; 00308 for (i = 2; i < fc->values; i++) { 00309 static const int a[] = { 00310 93, 23,372, 6, 46,186,750, 14, 33, 65, 00311 130,260,556, 3, 10, 18, 28, 39, 55, 79, 00312 111,158,220,312,464,650,850 00313 }; 00314 fc->list[i].x = a[i - 2]; 00315 } 00316 ff_vorbis_ready_floor1_list(fc->list, fc->values); 00317 00318 venc->nresidues = 1; 00319 venc->residues = av_malloc(sizeof(vorbis_enc_residue) * venc->nresidues); 00320 00321 // single residue 00322 rc = &venc->residues[0]; 00323 rc->type = 2; 00324 rc->begin = 0; 00325 rc->end = 1600; 00326 rc->partition_size = 32; 00327 rc->classifications = 10; 00328 rc->classbook = 15; 00329 rc->books = av_malloc(sizeof(*rc->books) * rc->classifications); 00330 { 00331 static const int8_t a[10][8] = { 00332 { -1, -1, -1, -1, -1, -1, -1, -1, }, 00333 { -1, -1, 16, -1, -1, -1, -1, -1, }, 00334 { -1, -1, 17, -1, -1, -1, -1, -1, }, 00335 { -1, -1, 18, -1, -1, -1, -1, -1, }, 00336 { -1, -1, 19, -1, -1, -1, -1, -1, }, 00337 { -1, -1, 20, -1, -1, -1, -1, -1, }, 00338 { -1, -1, 21, -1, -1, -1, -1, -1, }, 00339 { 22, 23, -1, -1, -1, -1, -1, -1, }, 00340 { 24, 25, -1, -1, -1, -1, -1, -1, }, 00341 { 26, 27, 28, -1, -1, -1, -1, -1, }, 00342 }; 00343 memcpy(rc->books, a, sizeof a); 00344 } 00345 ready_residue(rc, venc); 00346 00347 venc->nmappings = 1; 00348 venc->mappings = av_malloc(sizeof(vorbis_enc_mapping) * venc->nmappings); 00349 00350 // single mapping 00351 mc = &venc->mappings[0]; 00352 mc->submaps = 1; 00353 mc->mux = av_malloc(sizeof(int) * venc->channels); 00354 for (i = 0; i < venc->channels; i++) 00355 mc->mux[i] = 0; 00356 mc->floor = av_malloc(sizeof(int) * mc->submaps); 00357 mc->residue = av_malloc(sizeof(int) * mc->submaps); 00358 for (i = 0; i < mc->submaps; i++) { 00359 mc->floor[i] = 0; 00360 mc->residue[i] = 0; 00361 } 00362 mc->coupling_steps = venc->channels == 2 ? 1 : 0; 00363 mc->magnitude = av_malloc(sizeof(int) * mc->coupling_steps); 00364 mc->angle = av_malloc(sizeof(int) * mc->coupling_steps); 00365 if (mc->coupling_steps) { 00366 mc->magnitude[0] = 0; 00367 mc->angle[0] = 1; 00368 } 00369 00370 venc->nmodes = 1; 00371 venc->modes = av_malloc(sizeof(vorbis_enc_mode) * venc->nmodes); 00372 00373 // single mode 00374 venc->modes[0].blockflag = 0; 00375 venc->modes[0].mapping = 0; 00376 00377 venc->have_saved = 0; 00378 venc->saved = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2); 00379 venc->samples = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1])); 00380 venc->floor = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2); 00381 venc->coeffs = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2); 00382 00383 venc->win[0] = ff_vorbis_vwin[venc->log2_blocksize[0] - 6]; 00384 venc->win[1] = ff_vorbis_vwin[venc->log2_blocksize[1] - 6]; 00385 00386 ff_mdct_init(&venc->mdct[0], venc->log2_blocksize[0], 0, 1.0); 00387 ff_mdct_init(&venc->mdct[1], venc->log2_blocksize[1], 0, 1.0); 00388 } 00389 00390 static void put_float(PutBitContext *pb, float f) 00391 { 00392 int exp, mant; 00393 uint32_t res = 0; 00394 mant = (int)ldexp(frexp(f, &exp), 20); 00395 exp += 788 - 20; 00396 if (mant < 0) { 00397 res |= (1U << 31); 00398 mant = -mant; 00399 } 00400 res |= mant | (exp << 21); 00401 put_bits32(pb, res); 00402 } 00403 00404 static void put_codebook_header(PutBitContext *pb, vorbis_enc_codebook *cb) 00405 { 00406 int i; 00407 int ordered = 0; 00408 00409 put_bits(pb, 24, 0x564342); //magic 00410 put_bits(pb, 16, cb->ndimentions); 00411 put_bits(pb, 24, cb->nentries); 00412 00413 for (i = 1; i < cb->nentries; i++) 00414 if (cb->lens[i] < cb->lens[i-1]) 00415 break; 00416 if (i == cb->nentries) 00417 ordered = 1; 00418 00419 put_bits(pb, 1, ordered); 00420 if (ordered) { 00421 int len = cb->lens[0]; 00422 put_bits(pb, 5, len - 1); 00423 i = 0; 00424 while (i < cb->nentries) { 00425 int j; 00426 for (j = 0; j+i < cb->nentries; j++) 00427 if (cb->lens[j+i] != len) 00428 break; 00429 put_bits(pb, ilog(cb->nentries - i), j); 00430 i += j; 00431 len++; 00432 } 00433 } else { 00434 int sparse = 0; 00435 for (i = 0; i < cb->nentries; i++) 00436 if (!cb->lens[i]) 00437 break; 00438 if (i != cb->nentries) 00439 sparse = 1; 00440 put_bits(pb, 1, sparse); 00441 00442 for (i = 0; i < cb->nentries; i++) { 00443 if (sparse) 00444 put_bits(pb, 1, !!cb->lens[i]); 00445 if (cb->lens[i]) 00446 put_bits(pb, 5, cb->lens[i] - 1); 00447 } 00448 } 00449 00450 put_bits(pb, 4, cb->lookup); 00451 if (cb->lookup) { 00452 int tmp = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries); 00453 int bits = ilog(cb->quantlist[0]); 00454 00455 for (i = 1; i < tmp; i++) 00456 bits = FFMAX(bits, ilog(cb->quantlist[i])); 00457 00458 put_float(pb, cb->min); 00459 put_float(pb, cb->delta); 00460 00461 put_bits(pb, 4, bits - 1); 00462 put_bits(pb, 1, cb->seq_p); 00463 00464 for (i = 0; i < tmp; i++) 00465 put_bits(pb, bits, cb->quantlist[i]); 00466 } 00467 } 00468 00469 static void put_floor_header(PutBitContext *pb, vorbis_enc_floor *fc) 00470 { 00471 int i; 00472 00473 put_bits(pb, 16, 1); // type, only floor1 is supported 00474 00475 put_bits(pb, 5, fc->partitions); 00476 00477 for (i = 0; i < fc->partitions; i++) 00478 put_bits(pb, 4, fc->partition_to_class[i]); 00479 00480 for (i = 0; i < fc->nclasses; i++) { 00481 int j, books; 00482 00483 put_bits(pb, 3, fc->classes[i].dim - 1); 00484 put_bits(pb, 2, fc->classes[i].subclass); 00485 00486 if (fc->classes[i].subclass) 00487 put_bits(pb, 8, fc->classes[i].masterbook); 00488 00489 books = (1 << fc->classes[i].subclass); 00490 00491 for (j = 0; j < books; j++) 00492 put_bits(pb, 8, fc->classes[i].books[j] + 1); 00493 } 00494 00495 put_bits(pb, 2, fc->multiplier - 1); 00496 put_bits(pb, 4, fc->rangebits); 00497 00498 for (i = 2; i < fc->values; i++) 00499 put_bits(pb, fc->rangebits, fc->list[i].x); 00500 } 00501 00502 static void put_residue_header(PutBitContext *pb, vorbis_enc_residue *rc) 00503 { 00504 int i; 00505 00506 put_bits(pb, 16, rc->type); 00507 00508 put_bits(pb, 24, rc->begin); 00509 put_bits(pb, 24, rc->end); 00510 put_bits(pb, 24, rc->partition_size - 1); 00511 put_bits(pb, 6, rc->classifications - 1); 00512 put_bits(pb, 8, rc->classbook); 00513 00514 for (i = 0; i < rc->classifications; i++) { 00515 int j, tmp = 0; 00516 for (j = 0; j < 8; j++) 00517 tmp |= (rc->books[i][j] != -1) << j; 00518 00519 put_bits(pb, 3, tmp & 7); 00520 put_bits(pb, 1, tmp > 7); 00521 00522 if (tmp > 7) 00523 put_bits(pb, 5, tmp >> 3); 00524 } 00525 00526 for (i = 0; i < rc->classifications; i++) { 00527 int j; 00528 for (j = 0; j < 8; j++) 00529 if (rc->books[i][j] != -1) 00530 put_bits(pb, 8, rc->books[i][j]); 00531 } 00532 } 00533 00534 static int put_main_header(vorbis_enc_context *venc, uint8_t **out) 00535 { 00536 int i; 00537 PutBitContext pb; 00538 uint8_t buffer[50000] = {0}, *p = buffer; 00539 int buffer_len = sizeof buffer; 00540 int len, hlens[3]; 00541 00542 // identification header 00543 init_put_bits(&pb, p, buffer_len); 00544 put_bits(&pb, 8, 1); //magic 00545 for (i = 0; "vorbis"[i]; i++) 00546 put_bits(&pb, 8, "vorbis"[i]); 00547 put_bits32(&pb, 0); // version 00548 put_bits(&pb, 8, venc->channels); 00549 put_bits32(&pb, venc->sample_rate); 00550 put_bits32(&pb, 0); // bitrate 00551 put_bits32(&pb, 0); // bitrate 00552 put_bits32(&pb, 0); // bitrate 00553 put_bits(&pb, 4, venc->log2_blocksize[0]); 00554 put_bits(&pb, 4, venc->log2_blocksize[1]); 00555 put_bits(&pb, 1, 1); // framing 00556 00557 flush_put_bits(&pb); 00558 hlens[0] = put_bits_count(&pb) >> 3; 00559 buffer_len -= hlens[0]; 00560 p += hlens[0]; 00561 00562 // comment header 00563 init_put_bits(&pb, p, buffer_len); 00564 put_bits(&pb, 8, 3); //magic 00565 for (i = 0; "vorbis"[i]; i++) 00566 put_bits(&pb, 8, "vorbis"[i]); 00567 put_bits32(&pb, 0); // vendor length TODO 00568 put_bits32(&pb, 0); // amount of comments 00569 put_bits(&pb, 1, 1); // framing 00570 00571 flush_put_bits(&pb); 00572 hlens[1] = put_bits_count(&pb) >> 3; 00573 buffer_len -= hlens[1]; 00574 p += hlens[1]; 00575 00576 // setup header 00577 init_put_bits(&pb, p, buffer_len); 00578 put_bits(&pb, 8, 5); //magic 00579 for (i = 0; "vorbis"[i]; i++) 00580 put_bits(&pb, 8, "vorbis"[i]); 00581 00582 // codebooks 00583 put_bits(&pb, 8, venc->ncodebooks - 1); 00584 for (i = 0; i < venc->ncodebooks; i++) 00585 put_codebook_header(&pb, &venc->codebooks[i]); 00586 00587 // time domain, reserved, zero 00588 put_bits(&pb, 6, 0); 00589 put_bits(&pb, 16, 0); 00590 00591 // floors 00592 put_bits(&pb, 6, venc->nfloors - 1); 00593 for (i = 0; i < venc->nfloors; i++) 00594 put_floor_header(&pb, &venc->floors[i]); 00595 00596 // residues 00597 put_bits(&pb, 6, venc->nresidues - 1); 00598 for (i = 0; i < venc->nresidues; i++) 00599 put_residue_header(&pb, &venc->residues[i]); 00600 00601 // mappings 00602 put_bits(&pb, 6, venc->nmappings - 1); 00603 for (i = 0; i < venc->nmappings; i++) { 00604 vorbis_enc_mapping *mc = &venc->mappings[i]; 00605 int j; 00606 put_bits(&pb, 16, 0); // mapping type 00607 00608 put_bits(&pb, 1, mc->submaps > 1); 00609 if (mc->submaps > 1) 00610 put_bits(&pb, 4, mc->submaps - 1); 00611 00612 put_bits(&pb, 1, !!mc->coupling_steps); 00613 if (mc->coupling_steps) { 00614 put_bits(&pb, 8, mc->coupling_steps - 1); 00615 for (j = 0; j < mc->coupling_steps; j++) { 00616 put_bits(&pb, ilog(venc->channels - 1), mc->magnitude[j]); 00617 put_bits(&pb, ilog(venc->channels - 1), mc->angle[j]); 00618 } 00619 } 00620 00621 put_bits(&pb, 2, 0); // reserved 00622 00623 if (mc->submaps > 1) 00624 for (j = 0; j < venc->channels; j++) 00625 put_bits(&pb, 4, mc->mux[j]); 00626 00627 for (j = 0; j < mc->submaps; j++) { 00628 put_bits(&pb, 8, 0); // reserved time configuration 00629 put_bits(&pb, 8, mc->floor[j]); 00630 put_bits(&pb, 8, mc->residue[j]); 00631 } 00632 } 00633 00634 // modes 00635 put_bits(&pb, 6, venc->nmodes - 1); 00636 for (i = 0; i < venc->nmodes; i++) { 00637 put_bits(&pb, 1, venc->modes[i].blockflag); 00638 put_bits(&pb, 16, 0); // reserved window type 00639 put_bits(&pb, 16, 0); // reserved transform type 00640 put_bits(&pb, 8, venc->modes[i].mapping); 00641 } 00642 00643 put_bits(&pb, 1, 1); // framing 00644 00645 flush_put_bits(&pb); 00646 hlens[2] = put_bits_count(&pb) >> 3; 00647 00648 len = hlens[0] + hlens[1] + hlens[2]; 00649 p = *out = av_mallocz(64 + len + len/255); 00650 00651 *p++ = 2; 00652 p += av_xiphlacing(p, hlens[0]); 00653 p += av_xiphlacing(p, hlens[1]); 00654 buffer_len = 0; 00655 for (i = 0; i < 3; i++) { 00656 memcpy(p, buffer + buffer_len, hlens[i]); 00657 p += hlens[i]; 00658 buffer_len += hlens[i]; 00659 } 00660 00661 return p - *out; 00662 } 00663 00664 static float get_floor_average(vorbis_enc_floor * fc, float *coeffs, int i) 00665 { 00666 int begin = fc->list[fc->list[FFMAX(i-1, 0)].sort].x; 00667 int end = fc->list[fc->list[FFMIN(i+1, fc->values - 1)].sort].x; 00668 int j; 00669 float average = 0; 00670 00671 for (j = begin; j < end; j++) 00672 average += fabs(coeffs[j]); 00673 return average / (end - begin); 00674 } 00675 00676 static void floor_fit(vorbis_enc_context *venc, vorbis_enc_floor *fc, 00677 float *coeffs, uint16_t *posts, int samples) 00678 { 00679 int range = 255 / fc->multiplier + 1; 00680 int i; 00681 float tot_average = 0.; 00682 float averages[MAX_FLOOR_VALUES]; 00683 for (i = 0; i < fc->values; i++) { 00684 averages[i] = get_floor_average(fc, coeffs, i); 00685 tot_average += averages[i]; 00686 } 00687 tot_average /= fc->values; 00688 tot_average /= venc->quality; 00689 00690 for (i = 0; i < fc->values; i++) { 00691 int position = fc->list[fc->list[i].sort].x; 00692 float average = averages[i]; 00693 int j; 00694 00695 average = sqrt(tot_average * average) * pow(1.25f, position*0.005f); // MAGIC! 00696 for (j = 0; j < range - 1; j++) 00697 if (ff_vorbis_floor1_inverse_db_table[j * fc->multiplier] > average) 00698 break; 00699 posts[fc->list[i].sort] = j; 00700 } 00701 } 00702 00703 static int render_point(int x0, int y0, int x1, int y1, int x) 00704 { 00705 return y0 + (x - x0) * (y1 - y0) / (x1 - x0); 00706 } 00707 00708 static void floor_encode(vorbis_enc_context *venc, vorbis_enc_floor *fc, 00709 PutBitContext *pb, uint16_t *posts, 00710 float *floor, int samples) 00711 { 00712 int range = 255 / fc->multiplier + 1; 00713 int coded[MAX_FLOOR_VALUES]; // first 2 values are unused 00714 int i, counter; 00715 00716 put_bits(pb, 1, 1); // non zero 00717 put_bits(pb, ilog(range - 1), posts[0]); 00718 put_bits(pb, ilog(range - 1), posts[1]); 00719 coded[0] = coded[1] = 1; 00720 00721 for (i = 2; i < fc->values; i++) { 00722 int predicted = render_point(fc->list[fc->list[i].low].x, 00723 posts[fc->list[i].low], 00724 fc->list[fc->list[i].high].x, 00725 posts[fc->list[i].high], 00726 fc->list[i].x); 00727 int highroom = range - predicted; 00728 int lowroom = predicted; 00729 int room = FFMIN(highroom, lowroom); 00730 if (predicted == posts[i]) { 00731 coded[i] = 0; // must be used later as flag! 00732 continue; 00733 } else { 00734 if (!coded[fc->list[i].low ]) 00735 coded[fc->list[i].low ] = -1; 00736 if (!coded[fc->list[i].high]) 00737 coded[fc->list[i].high] = -1; 00738 } 00739 if (posts[i] > predicted) { 00740 if (posts[i] - predicted > room) 00741 coded[i] = posts[i] - predicted + lowroom; 00742 else 00743 coded[i] = (posts[i] - predicted) << 1; 00744 } else { 00745 if (predicted - posts[i] > room) 00746 coded[i] = predicted - posts[i] + highroom - 1; 00747 else 00748 coded[i] = ((predicted - posts[i]) << 1) - 1; 00749 } 00750 } 00751 00752 counter = 2; 00753 for (i = 0; i < fc->partitions; i++) { 00754 vorbis_enc_floor_class * c = &fc->classes[fc->partition_to_class[i]]; 00755 int k, cval = 0, csub = 1<<c->subclass; 00756 if (c->subclass) { 00757 vorbis_enc_codebook * book = &venc->codebooks[c->masterbook]; 00758 int cshift = 0; 00759 for (k = 0; k < c->dim; k++) { 00760 int l; 00761 for (l = 0; l < csub; l++) { 00762 int maxval = 1; 00763 if (c->books[l] != -1) 00764 maxval = venc->codebooks[c->books[l]].nentries; 00765 // coded could be -1, but this still works, cause that is 0 00766 if (coded[counter + k] < maxval) 00767 break; 00768 } 00769 assert(l != csub); 00770 cval |= l << cshift; 00771 cshift += c->subclass; 00772 } 00773 put_codeword(pb, book, cval); 00774 } 00775 for (k = 0; k < c->dim; k++) { 00776 int book = c->books[cval & (csub-1)]; 00777 int entry = coded[counter++]; 00778 cval >>= c->subclass; 00779 if (book == -1) 00780 continue; 00781 if (entry == -1) 00782 entry = 0; 00783 put_codeword(pb, &venc->codebooks[book], entry); 00784 } 00785 } 00786 00787 ff_vorbis_floor1_render_list(fc->list, fc->values, posts, coded, 00788 fc->multiplier, floor, samples); 00789 } 00790 00791 static float *put_vector(vorbis_enc_codebook *book, PutBitContext *pb, 00792 float *num) 00793 { 00794 int i, entry = -1; 00795 float distance = FLT_MAX; 00796 assert(book->dimentions); 00797 for (i = 0; i < book->nentries; i++) { 00798 float * vec = book->dimentions + i * book->ndimentions, d = book->pow2[i]; 00799 int j; 00800 if (!book->lens[i]) 00801 continue; 00802 for (j = 0; j < book->ndimentions; j++) 00803 d -= vec[j] * num[j]; 00804 if (distance > d) { 00805 entry = i; 00806 distance = d; 00807 } 00808 } 00809 put_codeword(pb, book, entry); 00810 return &book->dimentions[entry * book->ndimentions]; 00811 } 00812 00813 static void residue_encode(vorbis_enc_context *venc, vorbis_enc_residue *rc, 00814 PutBitContext *pb, float *coeffs, int samples, 00815 int real_ch) 00816 { 00817 int pass, i, j, p, k; 00818 int psize = rc->partition_size; 00819 int partitions = (rc->end - rc->begin) / psize; 00820 int channels = (rc->type == 2) ? 1 : real_ch; 00821 int classes[MAX_CHANNELS][NUM_RESIDUE_PARTITIONS]; 00822 int classwords = venc->codebooks[rc->classbook].ndimentions; 00823 00824 assert(rc->type == 2); 00825 assert(real_ch == 2); 00826 for (p = 0; p < partitions; p++) { 00827 float max1 = 0., max2 = 0.; 00828 int s = rc->begin + p * psize; 00829 for (k = s; k < s + psize; k += 2) { 00830 max1 = FFMAX(max1, fabs(coeffs[ k / real_ch])); 00831 max2 = FFMAX(max2, fabs(coeffs[samples + k / real_ch])); 00832 } 00833 00834 for (i = 0; i < rc->classifications - 1; i++) 00835 if (max1 < rc->maxes[i][0] && max2 < rc->maxes[i][1]) 00836 break; 00837 classes[0][p] = i; 00838 } 00839 00840 for (pass = 0; pass < 8; pass++) { 00841 p = 0; 00842 while (p < partitions) { 00843 if (pass == 0) 00844 for (j = 0; j < channels; j++) { 00845 vorbis_enc_codebook * book = &venc->codebooks[rc->classbook]; 00846 int entry = 0; 00847 for (i = 0; i < classwords; i++) { 00848 entry *= rc->classifications; 00849 entry += classes[j][p + i]; 00850 } 00851 put_codeword(pb, book, entry); 00852 } 00853 for (i = 0; i < classwords && p < partitions; i++, p++) { 00854 for (j = 0; j < channels; j++) { 00855 int nbook = rc->books[classes[j][p]][pass]; 00856 vorbis_enc_codebook * book = &venc->codebooks[nbook]; 00857 float *buf = coeffs + samples*j + rc->begin + p*psize; 00858 if (nbook == -1) 00859 continue; 00860 00861 assert(rc->type == 0 || rc->type == 2); 00862 assert(!(psize % book->ndimentions)); 00863 00864 if (rc->type == 0) { 00865 for (k = 0; k < psize; k += book->ndimentions) { 00866 float *a = put_vector(book, pb, &buf[k]); 00867 int l; 00868 for (l = 0; l < book->ndimentions; l++) 00869 buf[k + l] -= a[l]; 00870 } 00871 } else { 00872 int s = rc->begin + p * psize, a1, b1; 00873 a1 = (s % real_ch) * samples; 00874 b1 = s / real_ch; 00875 s = real_ch * samples; 00876 for (k = 0; k < psize; k += book->ndimentions) { 00877 int dim, a2 = a1, b2 = b1; 00878 float vec[MAX_CODEBOOK_DIM], *pv = vec; 00879 for (dim = book->ndimentions; dim--; ) { 00880 *pv++ = coeffs[a2 + b2]; 00881 if ((a2 += samples) == s) { 00882 a2 = 0; 00883 b2++; 00884 } 00885 } 00886 pv = put_vector(book, pb, vec); 00887 for (dim = book->ndimentions; dim--; ) { 00888 coeffs[a1 + b1] -= *pv++; 00889 if ((a1 += samples) == s) { 00890 a1 = 0; 00891 b1++; 00892 } 00893 } 00894 } 00895 } 00896 } 00897 } 00898 } 00899 } 00900 } 00901 00902 static int apply_window_and_mdct(vorbis_enc_context *venc, const signed short *audio, 00903 int samples) 00904 { 00905 int i, j, channel; 00906 const float * win = venc->win[0]; 00907 int window_len = 1 << (venc->log2_blocksize[0] - 1); 00908 float n = (float)(1 << venc->log2_blocksize[0]) / 4.; 00909 // FIXME use dsp 00910 00911 if (!venc->have_saved && !samples) 00912 return 0; 00913 00914 if (venc->have_saved) { 00915 for (channel = 0; channel < venc->channels; channel++) 00916 memcpy(venc->samples + channel * window_len * 2, 00917 venc->saved + channel * window_len, sizeof(float) * window_len); 00918 } else { 00919 for (channel = 0; channel < venc->channels; channel++) 00920 memset(venc->samples + channel * window_len * 2, 0, 00921 sizeof(float) * window_len); 00922 } 00923 00924 if (samples) { 00925 for (channel = 0; channel < venc->channels; channel++) { 00926 float * offset = venc->samples + channel*window_len*2 + window_len; 00927 j = channel; 00928 for (i = 0; i < samples; i++, j += venc->channels) 00929 offset[i] = audio[j] / 32768. / n * win[window_len - i - 1]; 00930 } 00931 } else { 00932 for (channel = 0; channel < venc->channels; channel++) 00933 memset(venc->samples + channel * window_len * 2 + window_len, 00934 0, sizeof(float) * window_len); 00935 } 00936 00937 for (channel = 0; channel < venc->channels; channel++) 00938 venc->mdct[0].mdct_calc(&venc->mdct[0], venc->coeffs + channel * window_len, 00939 venc->samples + channel * window_len * 2); 00940 00941 if (samples) { 00942 for (channel = 0; channel < venc->channels; channel++) { 00943 float *offset = venc->saved + channel * window_len; 00944 j = channel; 00945 for (i = 0; i < samples; i++, j += venc->channels) 00946 offset[i] = audio[j] / 32768. / n * win[i]; 00947 } 00948 venc->have_saved = 1; 00949 } else { 00950 venc->have_saved = 0; 00951 } 00952 return 1; 00953 } 00954 00955 static av_cold int vorbis_encode_init(AVCodecContext *avccontext) 00956 { 00957 vorbis_enc_context *venc = avccontext->priv_data; 00958 00959 if (avccontext->channels != 2) { 00960 av_log(avccontext, AV_LOG_ERROR, "Current Libav Vorbis encoder only supports 2 channels.\n"); 00961 return -1; 00962 } 00963 00964 create_vorbis_context(venc, avccontext); 00965 00966 if (avccontext->flags & CODEC_FLAG_QSCALE) 00967 venc->quality = avccontext->global_quality / (float)FF_QP2LAMBDA / 10.; 00968 else 00969 venc->quality = 0.03; 00970 venc->quality *= venc->quality; 00971 00972 avccontext->extradata_size = put_main_header(venc, (uint8_t**)&avccontext->extradata); 00973 00974 avccontext->frame_size = 1 << (venc->log2_blocksize[0] - 1); 00975 00976 avccontext->coded_frame = avcodec_alloc_frame(); 00977 avccontext->coded_frame->key_frame = 1; 00978 00979 return 0; 00980 } 00981 00982 static int vorbis_encode_frame(AVCodecContext *avccontext, 00983 unsigned char *packets, 00984 int buf_size, void *data) 00985 { 00986 vorbis_enc_context *venc = avccontext->priv_data; 00987 const signed short *audio = data; 00988 int samples = data ? avccontext->frame_size : 0; 00989 vorbis_enc_mode *mode; 00990 vorbis_enc_mapping *mapping; 00991 PutBitContext pb; 00992 int i; 00993 00994 if (!apply_window_and_mdct(venc, audio, samples)) 00995 return 0; 00996 samples = 1 << (venc->log2_blocksize[0] - 1); 00997 00998 init_put_bits(&pb, packets, buf_size); 00999 01000 put_bits(&pb, 1, 0); // magic bit 01001 01002 put_bits(&pb, ilog(venc->nmodes - 1), 0); // 0 bits, the mode 01003 01004 mode = &venc->modes[0]; 01005 mapping = &venc->mappings[mode->mapping]; 01006 if (mode->blockflag) { 01007 put_bits(&pb, 1, 0); 01008 put_bits(&pb, 1, 0); 01009 } 01010 01011 for (i = 0; i < venc->channels; i++) { 01012 vorbis_enc_floor *fc = &venc->floors[mapping->floor[mapping->mux[i]]]; 01013 uint16_t posts[MAX_FLOOR_VALUES]; 01014 floor_fit(venc, fc, &venc->coeffs[i * samples], posts, samples); 01015 floor_encode(venc, fc, &pb, posts, &venc->floor[i * samples], samples); 01016 } 01017 01018 for (i = 0; i < venc->channels * samples; i++) 01019 venc->coeffs[i] /= venc->floor[i]; 01020 01021 for (i = 0; i < mapping->coupling_steps; i++) { 01022 float *mag = venc->coeffs + mapping->magnitude[i] * samples; 01023 float *ang = venc->coeffs + mapping->angle[i] * samples; 01024 int j; 01025 for (j = 0; j < samples; j++) { 01026 float a = ang[j]; 01027 ang[j] -= mag[j]; 01028 if (mag[j] > 0) 01029 ang[j] = -ang[j]; 01030 if (ang[j] < 0) 01031 mag[j] = a; 01032 } 01033 } 01034 01035 residue_encode(venc, &venc->residues[mapping->residue[mapping->mux[0]]], 01036 &pb, venc->coeffs, samples, venc->channels); 01037 01038 avccontext->coded_frame->pts = venc->sample_count; 01039 venc->sample_count += avccontext->frame_size; 01040 flush_put_bits(&pb); 01041 return put_bits_count(&pb) >> 3; 01042 } 01043 01044 01045 static av_cold int vorbis_encode_close(AVCodecContext *avccontext) 01046 { 01047 vorbis_enc_context *venc = avccontext->priv_data; 01048 int i; 01049 01050 if (venc->codebooks) 01051 for (i = 0; i < venc->ncodebooks; i++) { 01052 av_freep(&venc->codebooks[i].lens); 01053 av_freep(&venc->codebooks[i].codewords); 01054 av_freep(&venc->codebooks[i].quantlist); 01055 av_freep(&venc->codebooks[i].dimentions); 01056 av_freep(&venc->codebooks[i].pow2); 01057 } 01058 av_freep(&venc->codebooks); 01059 01060 if (venc->floors) 01061 for (i = 0; i < venc->nfloors; i++) { 01062 int j; 01063 if (venc->floors[i].classes) 01064 for (j = 0; j < venc->floors[i].nclasses; j++) 01065 av_freep(&venc->floors[i].classes[j].books); 01066 av_freep(&venc->floors[i].classes); 01067 av_freep(&venc->floors[i].partition_to_class); 01068 av_freep(&venc->floors[i].list); 01069 } 01070 av_freep(&venc->floors); 01071 01072 if (venc->residues) 01073 for (i = 0; i < venc->nresidues; i++) { 01074 av_freep(&venc->residues[i].books); 01075 av_freep(&venc->residues[i].maxes); 01076 } 01077 av_freep(&venc->residues); 01078 01079 if (venc->mappings) 01080 for (i = 0; i < venc->nmappings; i++) { 01081 av_freep(&venc->mappings[i].mux); 01082 av_freep(&venc->mappings[i].floor); 01083 av_freep(&venc->mappings[i].residue); 01084 av_freep(&venc->mappings[i].magnitude); 01085 av_freep(&venc->mappings[i].angle); 01086 } 01087 av_freep(&venc->mappings); 01088 01089 av_freep(&venc->modes); 01090 01091 av_freep(&venc->saved); 01092 av_freep(&venc->samples); 01093 av_freep(&venc->floor); 01094 av_freep(&venc->coeffs); 01095 01096 ff_mdct_end(&venc->mdct[0]); 01097 ff_mdct_end(&venc->mdct[1]); 01098 01099 av_freep(&avccontext->coded_frame); 01100 av_freep(&avccontext->extradata); 01101 01102 return 0 ; 01103 } 01104 01105 AVCodec ff_vorbis_encoder = { 01106 "vorbis", 01107 AVMEDIA_TYPE_AUDIO, 01108 CODEC_ID_VORBIS, 01109 sizeof(vorbis_enc_context), 01110 vorbis_encode_init, 01111 vorbis_encode_frame, 01112 vorbis_encode_close, 01113 .capabilities= CODEC_CAP_DELAY | CODEC_CAP_EXPERIMENTAL, 01114 .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE}, 01115 .long_name = NULL_IF_CONFIG_SMALL("Vorbis"), 01116 };