/* * copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file vorbis_enc.c * Native Vorbis encoder. * @author Oded Shimon <ods15@ods15.dyndns.org> */ #include <float.h> #include "avcodec.h" #include "dsputil.h" #include "vorbis.h" #include "vorbis_enc_data.h" #undef NDEBUG #include <assert.h> typedef struct { int nentries; uint8_t * lens; uint32_t * codewords; int ndimentions; float min; float delta; int seq_p; int lookup; int * quantlist; float * dimentions; float * pow2; } codebook_t; typedef struct { int dim; int subclass; int masterbook; int * books; } floor_class_t; typedef struct { int partitions; int * partition_to_class; int nclasses; floor_class_t * classes; int multiplier; int rangebits; int values; floor1_entry_t * list; } floor_t; typedef struct { int type; int begin; int end; int partition_size; int classifications; int classbook; int8_t (*books)[8]; float (*maxes)[2]; } residue_t; typedef struct { int submaps; int * mux; int * floor; int * residue; int coupling_steps; int * magnitude; int * angle; } mapping_t; typedef struct { int blockflag; int mapping; } vorbis_mode_t; typedef struct { int channels; int sample_rate; int log2_blocksize[2]; MDCTContext mdct[2]; const float * win[2]; int have_saved; float * saved; float * samples; float * floor; // also used for tmp values for mdct float * coeffs; // also used for residue after floor float quality; int ncodebooks; codebook_t * codebooks; int nfloors; floor_t * floors; int nresidues; residue_t * residues; int nmappings; mapping_t * mappings; int nmodes; vorbis_mode_t * modes; } venc_context_t; typedef struct { int total; int total_pos; int pos; uint8_t * buf_ptr; } PutBitContext; static inline void init_put_bits(PutBitContext * pb, uint8_t * buf, int buffer_len) { pb->total = buffer_len * 8; pb->total_pos = 0; pb->pos = 0; pb->buf_ptr = buf; } static void put_bits(PutBitContext * pb, int bits, uint64_t val) { if ((pb->total_pos += bits) >= pb->total) return; if (!bits) return; if (pb->pos) { if (pb->pos > bits) { *pb->buf_ptr |= val << (8 - pb->pos); pb->pos -= bits; bits = 0; } else { *pb->buf_ptr++ |= (val << (8 - pb->pos)) & 0xFF; val >>= pb->pos; bits -= pb->pos; pb->pos = 0; } } for (; bits >= 8; bits -= 8) { *pb->buf_ptr++ = val & 0xFF; val >>= 8; } if (bits) { *pb->buf_ptr = val; pb->pos = 8 - bits; } } static inline void flush_put_bits(PutBitContext * pb) { } static inline int put_bits_count(PutBitContext * pb) { return pb->total_pos; } static inline void put_codeword(PutBitContext * pb, codebook_t * cb, int entry) { assert(entry >= 0); assert(entry < cb->nentries); assert(cb->lens[entry]); put_bits(pb, cb->lens[entry], cb->codewords[entry]); } static int cb_lookup_vals(int lookup, int dimentions, int entries) { if (lookup == 1) return ff_vorbis_nth_root(entries, dimentions); else if (lookup == 2) return dimentions * entries; return 0; } static void ready_codebook(codebook_t * cb) { int i; ff_vorbis_len2vlc(cb->lens, cb->codewords, cb->nentries); if (!cb->lookup) cb->pow2 = cb->dimentions = NULL; else { int vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries); cb->dimentions = av_malloc(sizeof(float) * cb->nentries * cb->ndimentions); cb->pow2 = av_mallocz(sizeof(float) * cb->nentries); for (i = 0; i < cb->nentries; i++) { float last = 0; int j; int div = 1; for (j = 0; j < cb->ndimentions; j++) { int off; if (cb->lookup == 1) off = (i / div) % vals; // lookup type 1 else off = i * cb->ndimentions + j; // lookup type 2 cb->dimentions[i * cb->ndimentions + j] = last + cb->min + cb->quantlist[off] * cb->delta; if (cb->seq_p) last = cb->dimentions[i * cb->ndimentions + j]; cb->pow2[i] += cb->dimentions[i * cb->ndimentions + j]*cb->dimentions[i * cb->ndimentions + j]; div *= vals; } cb->pow2[i] /= 2.; } } } static void ready_residue(residue_t * rc, venc_context_t * venc) { int i; assert(rc->type == 2); rc->maxes = av_mallocz(sizeof(float[2]) * rc->classifications); for (i = 0; i < rc->classifications; i++) { int j; codebook_t * cb; for (j = 0; j < 8; j++) if (rc->books[i][j] != -1) break; if (j == 8) continue; // zero cb = &venc->codebooks[rc->books[i][j]]; assert(cb->ndimentions >= 2); assert(cb->lookup); for (j = 0; j < cb->nentries; j++) { float a; if (!cb->lens[j]) continue; a = fabs(cb->dimentions[j * cb->ndimentions]); if (a > rc->maxes[i][0]) rc->maxes[i][0] = a; a = fabs(cb->dimentions[j * cb->ndimentions + 1]); if (a > rc->maxes[i][1]) rc->maxes[i][1] = a; } } // small bias for (i = 0; i < rc->classifications; i++) { rc->maxes[i][0] += 0.8; rc->maxes[i][1] += 0.8; } } static void create_vorbis_context(venc_context_t * venc, AVCodecContext * avccontext) { floor_t * fc; residue_t * rc; mapping_t * mc; int i, book; venc->channels = avccontext->channels; venc->sample_rate = avccontext->sample_rate; venc->log2_blocksize[0] = venc->log2_blocksize[1] = 11; venc->ncodebooks = sizeof(cvectors)/sizeof(cvectors[0]); venc->codebooks = av_malloc(sizeof(codebook_t) * venc->ncodebooks); // codebook 0..14 - floor1 book, values 0..255 // codebook 15 residue masterbook // codebook 16..29 residue for (book = 0; book < venc->ncodebooks; book++) { codebook_t * cb = &venc->codebooks[book]; int vals; cb->ndimentions = cvectors[book].dim; cb->nentries = cvectors[book].real_len; cb->min = cvectors[book].min; cb->delta = cvectors[book].delta; cb->lookup = cvectors[book].lookup; cb->seq_p = 0; cb->lens = av_malloc(sizeof(uint8_t) * cb->nentries); cb->codewords = av_malloc(sizeof(uint32_t) * cb->nentries); memcpy(cb->lens, cvectors[book].clens, cvectors[book].len); memset(cb->lens + cvectors[book].len, 0, cb->nentries - cvectors[book].len); if (cb->lookup) { vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries); cb->quantlist = av_malloc(sizeof(int) * vals); for (i = 0; i < vals; i++) cb->quantlist[i] = cvectors[book].quant[i]; } else { cb->quantlist = NULL; } ready_codebook(cb); } venc->nfloors = 1; venc->floors = av_malloc(sizeof(floor_t) * venc->nfloors); // just 1 floor fc = &venc->floors[0]; fc->partitions = 8; fc->partition_to_class = av_malloc(sizeof(int) * fc->partitions); fc->nclasses = 0; for (i = 0; i < fc->partitions; i++) { static const int a[] = {0,1,2,2,3,3,4,4}; fc->partition_to_class[i] = a[i]; fc->nclasses = FFMAX(fc->nclasses, fc->partition_to_class[i]); } fc->nclasses++; fc->classes = av_malloc(sizeof(floor_class_t) * fc->nclasses); for (i = 0; i < fc->nclasses; i++) { floor_class_t * c = &fc->classes[i]; int j, books; c->dim = floor_classes[i].dim; c->subclass = floor_classes[i].subclass; c->masterbook = floor_classes[i].masterbook; books = (1 << c->subclass); c->books = av_malloc(sizeof(int) * books); for (j = 0; j < books; j++) c->books[j] = floor_classes[i].nbooks[j]; } fc->multiplier = 2; fc->rangebits = venc->log2_blocksize[0] - 1; fc->values = 2; for (i = 0; i < fc->partitions; i++) fc->values += fc->classes[fc->partition_to_class[i]].dim; fc->list = av_malloc(sizeof(floor1_entry_t) * fc->values); fc->list[0].x = 0; fc->list[1].x = 1 << fc->rangebits; for (i = 2; i < fc->values; i++) { static const int a[] = { 93, 23,372, 6, 46,186,750, 14, 33, 65, 130,260,556, 3, 10, 18, 28, 39, 55, 79, 111,158,220,312,464,650,850 }; fc->list[i].x = a[i - 2]; } ff_vorbis_ready_floor1_list(fc->list, fc->values); venc->nresidues = 1; venc->residues = av_malloc(sizeof(residue_t) * venc->nresidues); // single residue rc = &venc->residues[0]; rc->type = 2; rc->begin = 0; rc->end = 1600; rc->partition_size = 32; rc->classifications = 10; rc->classbook = 15; rc->books = av_malloc(sizeof(*rc->books) * rc->classifications); { static const int8_t a[10][8] = { { -1, -1, -1, -1, -1, -1, -1, -1, }, { -1, -1, 16, -1, -1, -1, -1, -1, }, { -1, -1, 17, -1, -1, -1, -1, -1, }, { -1, -1, 18, -1, -1, -1, -1, -1, }, { -1, -1, 19, -1, -1, -1, -1, -1, }, { -1, -1, 20, -1, -1, -1, -1, -1, }, { -1, -1, 21, -1, -1, -1, -1, -1, }, { 22, 23, -1, -1, -1, -1, -1, -1, }, { 24, 25, -1, -1, -1, -1, -1, -1, }, { 26, 27, 28, -1, -1, -1, -1, -1, }, }; memcpy(rc->books, a, sizeof a); } ready_residue(rc, venc); venc->nmappings = 1; venc->mappings = av_malloc(sizeof(mapping_t) * venc->nmappings); // single mapping mc = &venc->mappings[0]; mc->submaps = 1; mc->mux = av_malloc(sizeof(int) * venc->channels); for (i = 0; i < venc->channels; i++) mc->mux[i] = 0; mc->floor = av_malloc(sizeof(int) * mc->submaps); mc->residue = av_malloc(sizeof(int) * mc->submaps); for (i = 0; i < mc->submaps; i++) { mc->floor[i] = 0; mc->residue[i] = 0; } mc->coupling_steps = venc->channels == 2 ? 1 : 0; mc->magnitude = av_malloc(sizeof(int) * mc->coupling_steps); mc->angle = av_malloc(sizeof(int) * mc->coupling_steps); if (mc->coupling_steps) { mc->magnitude[0] = 0; mc->angle[0] = 1; } venc->nmodes = 1; venc->modes = av_malloc(sizeof(vorbis_mode_t) * venc->nmodes); // single mode venc->modes[0].blockflag = 0; venc->modes[0].mapping = 0; venc->have_saved = 0; venc->saved = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2); venc->samples = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1])); venc->floor = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2); venc->coeffs = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2); venc->win[0] = ff_vorbis_vwin[venc->log2_blocksize[0] - 6]; venc->win[1] = ff_vorbis_vwin[venc->log2_blocksize[1] - 6]; ff_mdct_init(&venc->mdct[0], venc->log2_blocksize[0], 0); ff_mdct_init(&venc->mdct[1], venc->log2_blocksize[1], 0); } static void put_float(PutBitContext * pb, float f) { int exp, mant; uint32_t res = 0; mant = (int)ldexp(frexp(f, &exp), 20); exp += 788 - 20; if (mant < 0) { res |= (1 << 31); mant = -mant; } res |= mant | (exp << 21); put_bits(pb, 32, res); } static void put_codebook_header(PutBitContext * pb, codebook_t * cb) { int i; int ordered = 0; put_bits(pb, 24, 0x564342); //magic put_bits(pb, 16, cb->ndimentions); put_bits(pb, 24, cb->nentries); for (i = 1; i < cb->nentries; i++) if (cb->lens[i] < cb->lens[i-1]) break; if (i == cb->nentries) ordered = 1; put_bits(pb, 1, ordered); if (ordered) { int len = cb->lens[0]; put_bits(pb, 5, len - 1); i = 0; while (i < cb->nentries) { int j; for (j = 0; j+i < cb->nentries; j++) if (cb->lens[j+i] != len) break; put_bits(pb, ilog(cb->nentries - i), j); i += j; len++; } } else { int sparse = 0; for (i = 0; i < cb->nentries; i++) if (!cb->lens[i]) break; if (i != cb->nentries) sparse = 1; put_bits(pb, 1, sparse); for (i = 0; i < cb->nentries; i++) { if (sparse) put_bits(pb, 1, !!cb->lens[i]); if (cb->lens[i]) put_bits(pb, 5, cb->lens[i] - 1); } } put_bits(pb, 4, cb->lookup); if (cb->lookup) { int tmp = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries); int bits = ilog(cb->quantlist[0]); for (i = 1; i < tmp; i++) bits = FFMAX(bits, ilog(cb->quantlist[i])); put_float(pb, cb->min); put_float(pb, cb->delta); put_bits(pb, 4, bits - 1); put_bits(pb, 1, cb->seq_p); for (i = 0; i < tmp; i++) put_bits(pb, bits, cb->quantlist[i]); } } static void put_floor_header(PutBitContext * pb, floor_t * fc) { int i; put_bits(pb, 16, 1); // type, only floor1 is supported put_bits(pb, 5, fc->partitions); for (i = 0; i < fc->partitions; i++) put_bits(pb, 4, fc->partition_to_class[i]); for (i = 0; i < fc->nclasses; i++) { int j, books; put_bits(pb, 3, fc->classes[i].dim - 1); put_bits(pb, 2, fc->classes[i].subclass); if (fc->classes[i].subclass) put_bits(pb, 8, fc->classes[i].masterbook); books = (1 << fc->classes[i].subclass); for (j = 0; j < books; j++) put_bits(pb, 8, fc->classes[i].books[j] + 1); } put_bits(pb, 2, fc->multiplier - 1); put_bits(pb, 4, fc->rangebits); for (i = 2; i < fc->values; i++) put_bits(pb, fc->rangebits, fc->list[i].x); } static void put_residue_header(PutBitContext * pb, residue_t * rc) { int i; put_bits(pb, 16, rc->type); put_bits(pb, 24, rc->begin); put_bits(pb, 24, rc->end); put_bits(pb, 24, rc->partition_size - 1); put_bits(pb, 6, rc->classifications - 1); put_bits(pb, 8, rc->classbook); for (i = 0; i < rc->classifications; i++) { int j, tmp = 0; for (j = 0; j < 8; j++) tmp |= (rc->books[i][j] != -1) << j; put_bits(pb, 3, tmp & 7); put_bits(pb, 1, tmp > 7); if (tmp > 7) put_bits(pb, 5, tmp >> 3); } for (i = 0; i < rc->classifications; i++) { int j; for (j = 0; j < 8; j++) if (rc->books[i][j] != -1) put_bits(pb, 8, rc->books[i][j]); } } static int put_main_header(venc_context_t * venc, uint8_t ** out) { int i; PutBitContext pb; uint8_t buffer[50000] = {0}, * p = buffer; int buffer_len = sizeof buffer; int len, hlens[3]; // identification header init_put_bits(&pb, p, buffer_len); put_bits(&pb, 8, 1); //magic for (i = 0; "vorbis"[i]; i++) put_bits(&pb, 8, "vorbis"[i]); put_bits(&pb, 32, 0); // version put_bits(&pb, 8, venc->channels); put_bits(&pb, 32, venc->sample_rate); put_bits(&pb, 32, 0); // bitrate put_bits(&pb, 32, 0); // bitrate put_bits(&pb, 32, 0); // bitrate put_bits(&pb, 4, venc->log2_blocksize[0]); put_bits(&pb, 4, venc->log2_blocksize[1]); put_bits(&pb, 1, 1); // framing flush_put_bits(&pb); hlens[0] = (put_bits_count(&pb) + 7) / 8; buffer_len -= hlens[0]; p += hlens[0]; // comment header init_put_bits(&pb, p, buffer_len); put_bits(&pb, 8, 3); //magic for (i = 0; "vorbis"[i]; i++) put_bits(&pb, 8, "vorbis"[i]); put_bits(&pb, 32, 0); // vendor length TODO put_bits(&pb, 32, 0); // amount of comments put_bits(&pb, 1, 1); // framing flush_put_bits(&pb); hlens[1] = (put_bits_count(&pb) + 7) / 8; buffer_len -= hlens[1]; p += hlens[1]; // setup header init_put_bits(&pb, p, buffer_len); put_bits(&pb, 8, 5); //magic for (i = 0; "vorbis"[i]; i++) put_bits(&pb, 8, "vorbis"[i]); // codebooks put_bits(&pb, 8, venc->ncodebooks - 1); for (i = 0; i < venc->ncodebooks; i++) put_codebook_header(&pb, &venc->codebooks[i]); // time domain, reserved, zero put_bits(&pb, 6, 0); put_bits(&pb, 16, 0); // floors put_bits(&pb, 6, venc->nfloors - 1); for (i = 0; i < venc->nfloors; i++) put_floor_header(&pb, &venc->floors[i]); // residues put_bits(&pb, 6, venc->nresidues - 1); for (i = 0; i < venc->nresidues; i++) put_residue_header(&pb, &venc->residues[i]); // mappings put_bits(&pb, 6, venc->nmappings - 1); for (i = 0; i < venc->nmappings; i++) { mapping_t * mc = &venc->mappings[i]; int j; put_bits(&pb, 16, 0); // mapping type put_bits(&pb, 1, mc->submaps > 1); if (mc->submaps > 1) put_bits(&pb, 4, mc->submaps - 1); put_bits(&pb, 1, !!mc->coupling_steps); if (mc->coupling_steps) { put_bits(&pb, 8, mc->coupling_steps - 1); for (j = 0; j < mc->coupling_steps; j++) { put_bits(&pb, ilog(venc->channels - 1), mc->magnitude[j]); put_bits(&pb, ilog(venc->channels - 1), mc->angle[j]); } } put_bits(&pb, 2, 0); // reserved if (mc->submaps > 1) for (j = 0; j < venc->channels; j++) put_bits(&pb, 4, mc->mux[j]); for (j = 0; j < mc->submaps; j++) { put_bits(&pb, 8, 0); // reserved time configuration put_bits(&pb, 8, mc->floor[j]); put_bits(&pb, 8, mc->residue[j]); } } // modes put_bits(&pb, 6, venc->nmodes - 1); for (i = 0; i < venc->nmodes; i++) { put_bits(&pb, 1, venc->modes[i].blockflag); put_bits(&pb, 16, 0); // reserved window type put_bits(&pb, 16, 0); // reserved transform type put_bits(&pb, 8, venc->modes[i].mapping); } put_bits(&pb, 1, 1); // framing flush_put_bits(&pb); hlens[2] = (put_bits_count(&pb) + 7) / 8; len = hlens[0] + hlens[1] + hlens[2]; p = *out = av_mallocz(64 + len + len/255); *p++ = 2; p += av_xiphlacing(p, hlens[0]); p += av_xiphlacing(p, hlens[1]); buffer_len = 0; for (i = 0; i < 3; i++) { memcpy(p, buffer + buffer_len, hlens[i]); p += hlens[i]; buffer_len += hlens[i]; } return p - *out; } static float get_floor_average(floor_t * fc, float * coeffs, int i) { int begin = fc->list[fc->list[FFMAX(i-1, 0)].sort].x; int end = fc->list[fc->list[FFMIN(i+1, fc->values - 1)].sort].x; int j; float average = 0; for (j = begin; j < end; j++) average += fabs(coeffs[j]); return average / (end - begin); } static void floor_fit(venc_context_t * venc, floor_t * fc, float * coeffs, uint_fast16_t * posts, int samples) { int range = 255 / fc->multiplier + 1; int i; float tot_average = 0.; float averages[fc->values]; for (i = 0; i < fc->values; i++){ averages[i] = get_floor_average(fc, coeffs, i); tot_average += averages[i]; } tot_average /= fc->values; tot_average /= venc->quality; for (i = 0; i < fc->values; i++) { int position = fc->list[fc->list[i].sort].x; float average = averages[i]; int j; average *= pow(tot_average / average, 0.5) * pow(1.25, position/200.); // MAGIC! for (j = 0; j < range - 1; j++) if (ff_vorbis_floor1_inverse_db_table[j * fc->multiplier] > average) break; posts[fc->list[i].sort] = j; } } static int render_point(int x0, int y0, int x1, int y1, int x) { return y0 + (x - x0) * (y1 - y0) / (x1 - x0); } static void floor_encode(venc_context_t * venc, floor_t * fc, PutBitContext * pb, uint_fast16_t * posts, float * floor, int samples) { int range = 255 / fc->multiplier + 1; int coded[fc->values]; // first 2 values are unused int i, counter; put_bits(pb, 1, 1); // non zero put_bits(pb, ilog(range - 1), posts[0]); put_bits(pb, ilog(range - 1), posts[1]); coded[0] = coded[1] = 1; for (i = 2; i < fc->values; i++) { int predicted = render_point(fc->list[fc->list[i].low].x, posts[fc->list[i].low], fc->list[fc->list[i].high].x, posts[fc->list[i].high], fc->list[i].x); int highroom = range - predicted; int lowroom = predicted; int room = FFMIN(highroom, lowroom); if (predicted == posts[i]) { coded[i] = 0; // must be used later as flag! continue; } else { if (!coded[fc->list[i].low ]) coded[fc->list[i].low ] = -1; if (!coded[fc->list[i].high]) coded[fc->list[i].high] = -1; } if (posts[i] > predicted) { if (posts[i] - predicted > room) coded[i] = posts[i] - predicted + lowroom; else coded[i] = (posts[i] - predicted) << 1; } else { if (predicted - posts[i] > room) coded[i] = predicted - posts[i] + highroom - 1; else coded[i] = ((predicted - posts[i]) << 1) - 1; } } counter = 2; for (i = 0; i < fc->partitions; i++) { floor_class_t * c = &fc->classes[fc->partition_to_class[i]]; int k, cval = 0, csub = 1<<c->subclass; if (c->subclass) { codebook_t * book = &venc->codebooks[c->masterbook]; int cshift = 0; for (k = 0; k < c->dim; k++) { int l; for (l = 0; l < csub; l++) { int maxval = 1; if (c->books[l] != -1) maxval = venc->codebooks[c->books[l]].nentries; // coded could be -1, but this still works, cause that is 0 if (coded[counter + k] < maxval) break; } assert(l != csub); cval |= l << cshift; cshift += c->subclass; } put_codeword(pb, book, cval); } for (k = 0; k < c->dim; k++) { int book = c->books[cval & (csub-1)]; int entry = coded[counter++]; cval >>= c->subclass; if (book == -1) continue; if (entry == -1) entry = 0; put_codeword(pb, &venc->codebooks[book], entry); } } ff_vorbis_floor1_render_list(fc->list, fc->values, posts, coded, fc->multiplier, floor, samples); } static float * put_vector(codebook_t * book, PutBitContext * pb, float * num) { int i, entry = -1; float distance = FLT_MAX; assert(book->dimentions); for (i = 0; i < book->nentries; i++) { float * vec = book->dimentions + i * book->ndimentions, d = book->pow2[i]; int j; if (!book->lens[i]) continue; for (j = 0; j < book->ndimentions; j++) d -= vec[j] * num[j]; if (distance > d) { entry = i; distance = d; } } put_codeword(pb, book, entry); return &book->dimentions[entry * book->ndimentions]; } static void residue_encode(venc_context_t * venc, residue_t * rc, PutBitContext * pb, float * coeffs, int samples, int real_ch) { int pass, i, j, p, k; int psize = rc->partition_size; int partitions = (rc->end - rc->begin) / psize; int channels = (rc->type == 2) ? 1 : real_ch; int classes[channels][partitions]; int classwords = venc->codebooks[rc->classbook].ndimentions; assert(rc->type == 2); assert(real_ch == 2); for (p = 0; p < partitions; p++) { float max1 = 0., max2 = 0.; int s = rc->begin + p * psize; for (k = s; k < s + psize; k += 2) { max1 = FFMAX(max1, fabs(coeffs[ k / real_ch])); max2 = FFMAX(max2, fabs(coeffs[samples + k / real_ch])); } for (i = 0; i < rc->classifications - 1; i++) { if (max1 < rc->maxes[i][0] && max2 < rc->maxes[i][1]) break; } classes[0][p] = i; } for (pass = 0; pass < 8; pass++) { p = 0; while (p < partitions) { if (pass == 0) for (j = 0; j < channels; j++) { codebook_t * book = &venc->codebooks[rc->classbook]; int entry = 0; for (i = 0; i < classwords; i++) { entry *= rc->classifications; entry += classes[j][p + i]; } put_codeword(pb, book, entry); } for (i = 0; i < classwords && p < partitions; i++, p++) { for (j = 0; j < channels; j++) { int nbook = rc->books[classes[j][p]][pass]; codebook_t * book = &venc->codebooks[nbook]; float * buf = coeffs + samples*j + rc->begin + p*psize; if (nbook == -1) continue; assert(rc->type == 0 || rc->type == 2); assert(!(psize % book->ndimentions)); if (rc->type == 0) { for (k = 0; k < psize; k += book->ndimentions) { float * a = put_vector(book, pb, &buf[k]); int l; for (l = 0; l < book->ndimentions; l++) buf[k + l] -= a[l]; } } else { int s = rc->begin + p * psize, a1, b1; a1 = (s % real_ch) * samples; b1 = s / real_ch; s = real_ch * samples; for (k = 0; k < psize; k += book->ndimentions) { int dim, a2 = a1, b2 = b1; float vec[book->ndimentions], * pv = vec; for (dim = book->ndimentions; dim--; ) { *pv++ = coeffs[a2 + b2]; if ((a2 += samples) == s) { a2=0; b2++; } } pv = put_vector(book, pb, vec); for (dim = book->ndimentions; dim--; ) { coeffs[a1 + b1] -= *pv++; if ((a1 += samples) == s) { a1=0; b1++; } } } } } } } } } static int apply_window_and_mdct(venc_context_t * venc, signed short * audio, int samples) { int i, j, channel; const float * win = venc->win[0]; int window_len = 1 << (venc->log2_blocksize[0] - 1); float n = (float)(1 << venc->log2_blocksize[0]) / 4.; // FIXME use dsp if (!venc->have_saved && !samples) return 0; if (venc->have_saved) { for (channel = 0; channel < venc->channels; channel++) { memcpy(venc->samples + channel*window_len*2, venc->saved + channel*window_len, sizeof(float)*window_len); } } else { for (channel = 0; channel < venc->channels; channel++) { memset(venc->samples + channel*window_len*2, 0, sizeof(float)*window_len); } } if (samples) { for (channel = 0; channel < venc->channels; channel++) { float * offset = venc->samples + channel*window_len*2 + window_len; j = channel; for (i = 0; i < samples; i++, j += venc->channels) offset[i] = -audio[j] / 32768. / n * win[window_len - i - 1]; //FIXME find out why the sign has to be fliped } } else { for (channel = 0; channel < venc->channels; channel++) { memset(venc->samples + channel*window_len*2 + window_len, 0, sizeof(float)*window_len); } } for (channel = 0; channel < venc->channels; channel++) { ff_mdct_calc(&venc->mdct[0], venc->coeffs + channel*window_len, venc->samples + channel*window_len*2, venc->floor/*tmp*/); } if (samples) { for (channel = 0; channel < venc->channels; channel++) { float * offset = venc->saved + channel*window_len; j = channel; for (i = 0; i < samples; i++, j += venc->channels) offset[i] = -audio[j] / 32768. / n * win[i]; //FIXME find out why the sign has to be fliped } venc->have_saved = 1; } else { venc->have_saved = 0; } return 1; } static int vorbis_encode_init(AVCodecContext * avccontext) { venc_context_t * venc = avccontext->priv_data; if (avccontext->channels != 2) { av_log(avccontext, AV_LOG_ERROR, "Current FFmpeg Vorbis encoder only supports 2 channels.\n"); return -1; } create_vorbis_context(venc, avccontext); if (avccontext->flags & CODEC_FLAG_QSCALE) venc->quality = avccontext->global_quality / (float)FF_QP2LAMBDA / 10.; else venc->quality = 1.; venc->quality *= venc->quality; avccontext->extradata_size = put_main_header(venc, (uint8_t**)&avccontext->extradata); avccontext->frame_size = 1 << (venc->log2_blocksize[0] - 1); avccontext->coded_frame = avcodec_alloc_frame(); avccontext->coded_frame->key_frame = 1; return 0; } static int vorbis_encode_frame(AVCodecContext * avccontext, unsigned char * packets, int buf_size, void *data) { venc_context_t * venc = avccontext->priv_data; signed short * audio = data; int samples = data ? avccontext->frame_size : 0; vorbis_mode_t * mode; mapping_t * mapping; PutBitContext pb; int i; if (!apply_window_and_mdct(venc, audio, samples)) return 0; samples = 1 << (venc->log2_blocksize[0] - 1); init_put_bits(&pb, packets, buf_size); put_bits(&pb, 1, 0); // magic bit put_bits(&pb, ilog(venc->nmodes - 1), 0); // 0 bits, the mode mode = &venc->modes[0]; mapping = &venc->mappings[mode->mapping]; if (mode->blockflag) { put_bits(&pb, 1, 0); put_bits(&pb, 1, 0); } for (i = 0; i < venc->channels; i++) { floor_t * fc = &venc->floors[mapping->floor[mapping->mux[i]]]; uint_fast16_t posts[fc->values]; floor_fit(venc, fc, &venc->coeffs[i * samples], posts, samples); floor_encode(venc, fc, &pb, posts, &venc->floor[i * samples], samples); } for (i = 0; i < venc->channels * samples; i++) { venc->coeffs[i] /= venc->floor[i]; } for (i = 0; i < mapping->coupling_steps; i++) { float * mag = venc->coeffs + mapping->magnitude[i] * samples; float * ang = venc->coeffs + mapping->angle[i] * samples; int j; for (j = 0; j < samples; j++) { float a = ang[j]; ang[j] -= mag[j]; if (mag[j] > 0) ang[j] = -ang[j]; if (ang[j] < 0) mag[j] = a; } } residue_encode(venc, &venc->residues[mapping->residue[mapping->mux[0]]], &pb, venc->coeffs, samples, venc->channels); flush_put_bits(&pb); return (put_bits_count(&pb) + 7) / 8; } static int vorbis_encode_close(AVCodecContext * avccontext) { venc_context_t * venc = avccontext->priv_data; int i; if (venc->codebooks) for (i = 0; i < venc->ncodebooks; i++) { av_freep(&venc->codebooks[i].lens); av_freep(&venc->codebooks[i].codewords); av_freep(&venc->codebooks[i].quantlist); av_freep(&venc->codebooks[i].dimentions); av_freep(&venc->codebooks[i].pow2); } av_freep(&venc->codebooks); if (venc->floors) for (i = 0; i < venc->nfloors; i++) { int j; if (venc->floors[i].classes) for (j = 0; j < venc->floors[i].nclasses; j++) av_freep(&venc->floors[i].classes[j].books); av_freep(&venc->floors[i].classes); av_freep(&venc->floors[i].partition_to_class); av_freep(&venc->floors[i].list); } av_freep(&venc->floors); if (venc->residues) for (i = 0; i < venc->nresidues; i++) { av_freep(&venc->residues[i].books); av_freep(&venc->residues[i].maxes); } av_freep(&venc->residues); if (venc->mappings) for (i = 0; i < venc->nmappings; i++) { av_freep(&venc->mappings[i].mux); av_freep(&venc->mappings[i].floor); av_freep(&venc->mappings[i].residue); av_freep(&venc->mappings[i].magnitude); av_freep(&venc->mappings[i].angle); } av_freep(&venc->mappings); av_freep(&venc->modes); av_freep(&venc->saved); av_freep(&venc->samples); av_freep(&venc->floor); av_freep(&venc->coeffs); ff_mdct_end(&venc->mdct[0]); ff_mdct_end(&venc->mdct[1]); av_freep(&avccontext->coded_frame); av_freep(&avccontext->extradata); return 0 ; } AVCodec vorbis_encoder = { "vorbis", CODEC_TYPE_AUDIO, CODEC_ID_VORBIS, sizeof(venc_context_t), vorbis_encode_init, vorbis_encode_frame, vorbis_encode_close, .capabilities= CODEC_CAP_DELAY, };