1089 lines
34 KiB
C
1089 lines
34 KiB
C
/*
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* copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file vorbis_enc.c
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* Native Vorbis encoder.
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* @author Oded Shimon <ods15@ods15.dyndns.org>
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*/
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#include <float.h>
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#include "avcodec.h"
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#include "dsputil.h"
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#include "vorbis.h"
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#include "vorbis_enc_data.h"
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#undef NDEBUG
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#include <assert.h>
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typedef struct {
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int nentries;
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uint8_t * lens;
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uint32_t * codewords;
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int ndimentions;
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float min;
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float delta;
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int seq_p;
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int lookup;
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int * quantlist;
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float * dimentions;
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float * pow2;
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} codebook_t;
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typedef struct {
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int dim;
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int subclass;
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int masterbook;
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int * books;
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} floor_class_t;
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typedef struct {
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int partitions;
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int * partition_to_class;
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int nclasses;
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floor_class_t * classes;
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int multiplier;
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int rangebits;
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int values;
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floor1_entry_t * list;
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} floor_t;
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typedef struct {
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int type;
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int begin;
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int end;
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int partition_size;
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int classifications;
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int classbook;
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int8_t (*books)[8];
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float (*maxes)[2];
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} residue_t;
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typedef struct {
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int submaps;
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int * mux;
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int * floor;
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int * residue;
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int coupling_steps;
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int * magnitude;
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int * angle;
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} mapping_t;
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typedef struct {
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int blockflag;
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int mapping;
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} vorbis_mode_t;
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typedef struct {
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int channels;
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int sample_rate;
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int log2_blocksize[2];
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MDCTContext mdct[2];
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const float * win[2];
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int have_saved;
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float * saved;
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float * samples;
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float * floor; // also used for tmp values for mdct
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float * coeffs; // also used for residue after floor
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float quality;
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int ncodebooks;
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codebook_t * codebooks;
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int nfloors;
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floor_t * floors;
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int nresidues;
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residue_t * residues;
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int nmappings;
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mapping_t * mappings;
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int nmodes;
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vorbis_mode_t * modes;
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} venc_context_t;
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typedef struct {
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int total;
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int total_pos;
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int pos;
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uint8_t * buf_ptr;
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} PutBitContext;
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static inline void init_put_bits(PutBitContext * pb, uint8_t * buf, int buffer_len) {
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pb->total = buffer_len * 8;
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pb->total_pos = 0;
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pb->pos = 0;
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pb->buf_ptr = buf;
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}
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static void put_bits(PutBitContext * pb, int bits, uint64_t val) {
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if ((pb->total_pos += bits) >= pb->total) return;
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if (!bits) return;
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if (pb->pos) {
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if (pb->pos > bits) {
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*pb->buf_ptr |= val << (8 - pb->pos);
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pb->pos -= bits;
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bits = 0;
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} else {
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*pb->buf_ptr++ |= (val << (8 - pb->pos)) & 0xFF;
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val >>= pb->pos;
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bits -= pb->pos;
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pb->pos = 0;
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}
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}
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for (; bits >= 8; bits -= 8) {
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*pb->buf_ptr++ = val & 0xFF;
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val >>= 8;
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}
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if (bits) {
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*pb->buf_ptr = val;
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pb->pos = 8 - bits;
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}
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}
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static inline void flush_put_bits(PutBitContext * pb) {
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}
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static inline int put_bits_count(PutBitContext * pb) {
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return pb->total_pos;
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}
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static inline void put_codeword(PutBitContext * pb, codebook_t * cb, int entry) {
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assert(entry >= 0);
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assert(entry < cb->nentries);
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assert(cb->lens[entry]);
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put_bits(pb, cb->lens[entry], cb->codewords[entry]);
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}
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static int cb_lookup_vals(int lookup, int dimentions, int entries) {
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if (lookup == 1) return ff_vorbis_nth_root(entries, dimentions);
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else if (lookup == 2) return dimentions * entries;
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return 0;
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}
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static void ready_codebook(codebook_t * cb) {
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int i;
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ff_vorbis_len2vlc(cb->lens, cb->codewords, cb->nentries);
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if (!cb->lookup)
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cb->pow2 = cb->dimentions = NULL;
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else {
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int vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
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cb->dimentions = av_malloc(sizeof(float) * cb->nentries * cb->ndimentions);
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cb->pow2 = av_mallocz(sizeof(float) * cb->nentries);
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for (i = 0; i < cb->nentries; i++) {
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float last = 0;
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int j;
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int div = 1;
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for (j = 0; j < cb->ndimentions; j++) {
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int off;
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if (cb->lookup == 1)
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off = (i / div) % vals; // lookup type 1
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else
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off = i * cb->ndimentions + j; // lookup type 2
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cb->dimentions[i * cb->ndimentions + j] = last + cb->min + cb->quantlist[off] * cb->delta;
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if (cb->seq_p)
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last = cb->dimentions[i * cb->ndimentions + j];
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cb->pow2[i] += cb->dimentions[i * cb->ndimentions + j]*cb->dimentions[i * cb->ndimentions + j];
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div *= vals;
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}
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cb->pow2[i] /= 2.;
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}
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}
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}
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static void ready_residue(residue_t * rc, venc_context_t * venc) {
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int i;
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assert(rc->type == 2);
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rc->maxes = av_mallocz(sizeof(float[2]) * rc->classifications);
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for (i = 0; i < rc->classifications; i++) {
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int j;
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codebook_t * cb;
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for (j = 0; j < 8; j++)
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if (rc->books[i][j] != -1) break;
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if (j == 8) continue; // zero
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cb = &venc->codebooks[rc->books[i][j]];
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assert(cb->ndimentions >= 2);
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assert(cb->lookup);
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for (j = 0; j < cb->nentries; j++) {
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float a;
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if (!cb->lens[j]) continue;
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a = fabs(cb->dimentions[j * cb->ndimentions]);
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if (a > rc->maxes[i][0])
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rc->maxes[i][0] = a;
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a = fabs(cb->dimentions[j * cb->ndimentions + 1]);
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if (a > rc->maxes[i][1])
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rc->maxes[i][1] = a;
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}
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}
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// small bias
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for (i = 0; i < rc->classifications; i++) {
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rc->maxes[i][0] += 0.8;
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rc->maxes[i][1] += 0.8;
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}
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}
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static void create_vorbis_context(venc_context_t * venc, AVCodecContext * avccontext) {
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floor_t * fc;
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residue_t * rc;
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mapping_t * mc;
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int i, book;
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venc->channels = avccontext->channels;
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venc->sample_rate = avccontext->sample_rate;
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venc->log2_blocksize[0] = venc->log2_blocksize[1] = 11;
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venc->ncodebooks = sizeof(cvectors)/sizeof(cvectors[0]);
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venc->codebooks = av_malloc(sizeof(codebook_t) * venc->ncodebooks);
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// codebook 0..14 - floor1 book, values 0..255
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// codebook 15 residue masterbook
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// codebook 16..29 residue
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for (book = 0; book < venc->ncodebooks; book++) {
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codebook_t * cb = &venc->codebooks[book];
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int vals;
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cb->ndimentions = cvectors[book].dim;
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cb->nentries = cvectors[book].real_len;
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cb->min = cvectors[book].min;
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cb->delta = cvectors[book].delta;
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cb->lookup = cvectors[book].lookup;
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cb->seq_p = 0;
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cb->lens = av_malloc(sizeof(uint8_t) * cb->nentries);
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cb->codewords = av_malloc(sizeof(uint32_t) * cb->nentries);
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memcpy(cb->lens, cvectors[book].clens, cvectors[book].len);
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memset(cb->lens + cvectors[book].len, 0, cb->nentries - cvectors[book].len);
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if (cb->lookup) {
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vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
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cb->quantlist = av_malloc(sizeof(int) * vals);
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for (i = 0; i < vals; i++)
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cb->quantlist[i] = cvectors[book].quant[i];
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} else {
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cb->quantlist = NULL;
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}
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ready_codebook(cb);
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}
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venc->nfloors = 1;
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venc->floors = av_malloc(sizeof(floor_t) * venc->nfloors);
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// just 1 floor
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fc = &venc->floors[0];
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fc->partitions = 8;
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fc->partition_to_class = av_malloc(sizeof(int) * fc->partitions);
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fc->nclasses = 0;
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for (i = 0; i < fc->partitions; i++) {
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static const int a[] = {0,1,2,2,3,3,4,4};
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fc->partition_to_class[i] = a[i];
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fc->nclasses = FFMAX(fc->nclasses, fc->partition_to_class[i]);
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}
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fc->nclasses++;
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fc->classes = av_malloc(sizeof(floor_class_t) * fc->nclasses);
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for (i = 0; i < fc->nclasses; i++) {
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floor_class_t * c = &fc->classes[i];
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int j, books;
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c->dim = floor_classes[i].dim;
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c->subclass = floor_classes[i].subclass;
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c->masterbook = floor_classes[i].masterbook;
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books = (1 << c->subclass);
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c->books = av_malloc(sizeof(int) * books);
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for (j = 0; j < books; j++)
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c->books[j] = floor_classes[i].nbooks[j];
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}
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fc->multiplier = 2;
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fc->rangebits = venc->log2_blocksize[0] - 1;
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fc->values = 2;
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for (i = 0; i < fc->partitions; i++)
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fc->values += fc->classes[fc->partition_to_class[i]].dim;
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fc->list = av_malloc(sizeof(floor1_entry_t) * fc->values);
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fc->list[0].x = 0;
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fc->list[1].x = 1 << fc->rangebits;
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for (i = 2; i < fc->values; i++) {
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static const int a[] = {
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93, 23,372, 6, 46,186,750, 14, 33, 65,
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130,260,556, 3, 10, 18, 28, 39, 55, 79,
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111,158,220,312,464,650,850
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};
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fc->list[i].x = a[i - 2];
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}
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ff_vorbis_ready_floor1_list(fc->list, fc->values);
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venc->nresidues = 1;
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venc->residues = av_malloc(sizeof(residue_t) * venc->nresidues);
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// single residue
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rc = &venc->residues[0];
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rc->type = 2;
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rc->begin = 0;
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rc->end = 1600;
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rc->partition_size = 32;
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rc->classifications = 10;
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rc->classbook = 15;
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rc->books = av_malloc(sizeof(*rc->books) * rc->classifications);
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{
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static const int8_t a[10][8] = {
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{ -1, -1, -1, -1, -1, -1, -1, -1, },
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{ -1, -1, 16, -1, -1, -1, -1, -1, },
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{ -1, -1, 17, -1, -1, -1, -1, -1, },
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{ -1, -1, 18, -1, -1, -1, -1, -1, },
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{ -1, -1, 19, -1, -1, -1, -1, -1, },
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{ -1, -1, 20, -1, -1, -1, -1, -1, },
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{ -1, -1, 21, -1, -1, -1, -1, -1, },
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{ 22, 23, -1, -1, -1, -1, -1, -1, },
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{ 24, 25, -1, -1, -1, -1, -1, -1, },
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{ 26, 27, 28, -1, -1, -1, -1, -1, },
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};
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memcpy(rc->books, a, sizeof a);
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}
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ready_residue(rc, venc);
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venc->nmappings = 1;
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venc->mappings = av_malloc(sizeof(mapping_t) * venc->nmappings);
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// single mapping
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mc = &venc->mappings[0];
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mc->submaps = 1;
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mc->mux = av_malloc(sizeof(int) * venc->channels);
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for (i = 0; i < venc->channels; i++)
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mc->mux[i] = 0;
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mc->floor = av_malloc(sizeof(int) * mc->submaps);
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mc->residue = av_malloc(sizeof(int) * mc->submaps);
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for (i = 0; i < mc->submaps; i++) {
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mc->floor[i] = 0;
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mc->residue[i] = 0;
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}
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mc->coupling_steps = venc->channels == 2 ? 1 : 0;
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mc->magnitude = av_malloc(sizeof(int) * mc->coupling_steps);
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mc->angle = av_malloc(sizeof(int) * mc->coupling_steps);
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if (mc->coupling_steps) {
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mc->magnitude[0] = 0;
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mc->angle[0] = 1;
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}
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venc->nmodes = 1;
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venc->modes = av_malloc(sizeof(vorbis_mode_t) * venc->nmodes);
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// single mode
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venc->modes[0].blockflag = 0;
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venc->modes[0].mapping = 0;
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venc->have_saved = 0;
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venc->saved = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
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venc->samples = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]));
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venc->floor = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
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venc->coeffs = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
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venc->win[0] = ff_vorbis_vwin[venc->log2_blocksize[0] - 6];
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venc->win[1] = ff_vorbis_vwin[venc->log2_blocksize[1] - 6];
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ff_mdct_init(&venc->mdct[0], venc->log2_blocksize[0], 0);
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ff_mdct_init(&venc->mdct[1], venc->log2_blocksize[1], 0);
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}
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static void put_float(PutBitContext * pb, float f) {
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int exp, mant;
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uint32_t res = 0;
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mant = (int)ldexp(frexp(f, &exp), 20);
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exp += 788 - 20;
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if (mant < 0) { res |= (1 << 31); mant = -mant; }
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res |= mant | (exp << 21);
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put_bits(pb, 32, res);
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}
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static void put_codebook_header(PutBitContext * pb, codebook_t * cb) {
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int i;
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int ordered = 0;
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put_bits(pb, 24, 0x564342); //magic
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put_bits(pb, 16, cb->ndimentions);
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put_bits(pb, 24, cb->nentries);
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for (i = 1; i < cb->nentries; i++)
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if (cb->lens[i] < cb->lens[i-1]) break;
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if (i == cb->nentries)
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ordered = 1;
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put_bits(pb, 1, ordered);
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if (ordered) {
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int len = cb->lens[0];
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put_bits(pb, 5, len - 1);
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i = 0;
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while (i < cb->nentries) {
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int j;
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for (j = 0; j+i < cb->nentries; j++)
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if (cb->lens[j+i] != len) break;
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put_bits(pb, ilog(cb->nentries - i), j);
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i += j;
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len++;
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}
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} else {
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int sparse = 0;
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for (i = 0; i < cb->nentries; i++)
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if (!cb->lens[i]) break;
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if (i != cb->nentries)
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sparse = 1;
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put_bits(pb, 1, sparse);
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for (i = 0; i < cb->nentries; i++) {
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if (sparse) put_bits(pb, 1, !!cb->lens[i]);
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if (cb->lens[i]) put_bits(pb, 5, cb->lens[i] - 1);
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}
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}
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put_bits(pb, 4, cb->lookup);
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if (cb->lookup) {
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int tmp = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
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int bits = ilog(cb->quantlist[0]);
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for (i = 1; i < tmp; i++)
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bits = FFMAX(bits, ilog(cb->quantlist[i]));
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put_float(pb, cb->min);
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put_float(pb, cb->delta);
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put_bits(pb, 4, bits - 1);
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put_bits(pb, 1, cb->seq_p);
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for (i = 0; i < tmp; i++)
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put_bits(pb, bits, cb->quantlist[i]);
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}
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}
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static void put_floor_header(PutBitContext * pb, floor_t * fc) {
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int i;
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|
|
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 av_cold int vorbis_encode_init(AVCodecContext * avccontext)
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{
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venc_context_t * venc = avccontext->priv_data;
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if (avccontext->channels != 2) {
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av_log(avccontext, AV_LOG_ERROR, "Current FFmpeg Vorbis encoder only supports 2 channels.\n");
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return -1;
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}
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create_vorbis_context(venc, avccontext);
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if (avccontext->flags & CODEC_FLAG_QSCALE)
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venc->quality = avccontext->global_quality / (float)FF_QP2LAMBDA / 10.;
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else
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venc->quality = 1.;
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venc->quality *= venc->quality;
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avccontext->extradata_size = put_main_header(venc, (uint8_t**)&avccontext->extradata);
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avccontext->frame_size = 1 << (venc->log2_blocksize[0] - 1);
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avccontext->coded_frame = avcodec_alloc_frame();
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avccontext->coded_frame->key_frame = 1;
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return 0;
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}
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static int vorbis_encode_frame(AVCodecContext * avccontext, unsigned char * packets, int buf_size, void *data)
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{
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venc_context_t * venc = avccontext->priv_data;
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signed short * audio = data;
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int samples = data ? avccontext->frame_size : 0;
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vorbis_mode_t * mode;
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mapping_t * mapping;
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PutBitContext pb;
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int i;
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if (!apply_window_and_mdct(venc, audio, samples)) return 0;
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samples = 1 << (venc->log2_blocksize[0] - 1);
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init_put_bits(&pb, packets, buf_size);
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put_bits(&pb, 1, 0); // magic bit
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put_bits(&pb, ilog(venc->nmodes - 1), 0); // 0 bits, the mode
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mode = &venc->modes[0];
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mapping = &venc->mappings[mode->mapping];
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if (mode->blockflag) {
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put_bits(&pb, 1, 0);
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put_bits(&pb, 1, 0);
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}
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|
|
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for (i = 0; i < venc->channels; i++) {
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floor_t * fc = &venc->floors[mapping->floor[mapping->mux[i]]];
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uint_fast16_t posts[fc->values];
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floor_fit(venc, fc, &venc->coeffs[i * samples], posts, samples);
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floor_encode(venc, fc, &pb, posts, &venc->floor[i * samples], samples);
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}
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|
|
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for (i = 0; i < venc->channels * samples; i++) {
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venc->coeffs[i] /= venc->floor[i];
|
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}
|
|
|
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for (i = 0; i < mapping->coupling_steps; i++) {
|
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float * mag = venc->coeffs + mapping->magnitude[i] * samples;
|
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float * ang = venc->coeffs + mapping->angle[i] * samples;
|
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int j;
|
|
for (j = 0; j < samples; j++) {
|
|
float a = ang[j];
|
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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 av_cold 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 ;
|
|
}
|
|
|
|
const 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,
|
|
.long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
|
|
};
|