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ffmpeg / libavcodec / vorbis_enc.c @ 7d485f16

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/*
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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 libavcodec/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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#define BITSTREAM_WRITER_LE
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#include "put_bits.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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} vorbis_enc_codebook;
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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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} vorbis_enc_floor_class;
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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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    vorbis_enc_floor_class * classes;
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    int multiplier;
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    int rangebits;
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    int values;
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    vorbis_floor1_entry * list;
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} vorbis_enc_floor;
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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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} vorbis_enc_residue;
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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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} vorbis_enc_mapping;
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typedef struct {
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    int blockflag;
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    int mapping;
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} vorbis_enc_mode;
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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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    vorbis_enc_codebook * codebooks;
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    int nfloors;
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    vorbis_enc_floor * floors;
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    int nresidues;
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    vorbis_enc_residue * residues;
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    int nmappings;
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    vorbis_enc_mapping * mappings;
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    int nmodes;
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    vorbis_enc_mode * modes;
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    int64_t sample_count;
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} vorbis_enc_context;
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static inline void put_codeword(PutBitContext * pb, vorbis_enc_codebook * 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(vorbis_enc_codebook * 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(vorbis_enc_residue * rc, vorbis_enc_context * 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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        vorbis_enc_codebook * 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(vorbis_enc_context * venc, AVCodecContext * avccontext) {
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    vorbis_enc_floor * fc;
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    vorbis_enc_residue * rc;
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    vorbis_enc_mapping * 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 = FF_ARRAY_ELEMS(cvectors);
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    venc->codebooks = av_malloc(sizeof(vorbis_enc_codebook) * 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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        vorbis_enc_codebook * 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;
249
    venc->floors = av_malloc(sizeof(vorbis_enc_floor) * 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++) {
257
        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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    }
261
    fc->nclasses++;
262
    fc->classes = av_malloc(sizeof(vorbis_enc_floor_class) * fc->nclasses);
263
    for (i = 0; i < fc->nclasses; i++) {
264
        vorbis_enc_floor_class * c = &fc->classes[i];
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        int j, books;
266
        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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277
    fc->values = 2;
278
    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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281
    fc->list = av_malloc(sizeof(vorbis_floor1_entry) * fc->values);
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    fc->list[0].x = 0;
283
    fc->list[1].x = 1 << fc->rangebits;
284
    for (i = 2; i < fc->values; i++) {
285
        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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        };
290
        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(vorbis_enc_residue) * 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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    {
307
        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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        };
319
        memcpy(rc->books, a, sizeof a);
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    }
321
    ready_residue(rc, venc);
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    venc->nmappings = 1;
324
    venc->mappings = av_malloc(sizeof(vorbis_enc_mapping) * venc->nmappings);
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    // single mapping
327
    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);
341
    if (mc->coupling_steps) {
342
        mc->magnitude[0] = 0;
343
        mc->angle[0] = 1;
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    }
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    venc->nmodes = 1;
347
    venc->modes = av_malloc(sizeof(vorbis_enc_mode) * venc->nmodes);
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    // single mode
350
    venc->modes[0].blockflag = 0;
351
    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);
357
    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];
360
    venc->win[1] = ff_vorbis_vwin[venc->log2_blocksize[1] - 6];
361

    
362
    ff_mdct_init(&venc->mdct[0], venc->log2_blocksize[0], 0, 1.0);
363
    ff_mdct_init(&venc->mdct[1], venc->log2_blocksize[1], 0, 1.0);
364
}
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static void put_float(PutBitContext * pb, float f) {
367
    int exp, mant;
368
    uint32_t res = 0;
369
    mant = (int)ldexp(frexp(f, &exp), 20);
370
    exp += 788 - 20;
371
    if (mant < 0) { res |= (1 << 31); mant = -mant; }
372
    res |= mant | (exp << 21);
373
    put_bits(pb, 32, res);
374
}
375

    
376
static void put_codebook_header(PutBitContext * pb, vorbis_enc_codebook * cb) {
377
    int i;
378
    int ordered = 0;
379

    
380
    put_bits(pb, 24, 0x564342); //magic
381
    put_bits(pb, 16, cb->ndimentions);
382
    put_bits(pb, 24, cb->nentries);
383

    
384
    for (i = 1; i < cb->nentries; i++)
385
        if (cb->lens[i] < cb->lens[i-1]) break;
386
    if (i == cb->nentries)
387
        ordered = 1;
388

    
389
    put_bits(pb, 1, ordered);
390
    if (ordered) {
391
        int len = cb->lens[0];
392
        put_bits(pb, 5, len - 1);
393
        i = 0;
394
        while (i < cb->nentries) {
395
            int j;
396
            for (j = 0; j+i < cb->nentries; j++)
397
                if (cb->lens[j+i] != len) break;
398
            put_bits(pb, ilog(cb->nentries - i), j);
399
            i += j;
400
            len++;
401
        }
402
    } else {
403
        int sparse = 0;
404
        for (i = 0; i < cb->nentries; i++)
405
            if (!cb->lens[i]) break;
406
        if (i != cb->nentries)
407
            sparse = 1;
408
        put_bits(pb, 1, sparse);
409

    
410
        for (i = 0; i < cb->nentries; i++) {
411
            if (sparse) put_bits(pb, 1, !!cb->lens[i]);
412
            if (cb->lens[i]) put_bits(pb, 5, cb->lens[i] - 1);
413
        }
414
    }
415

    
416
    put_bits(pb, 4, cb->lookup);
417
    if (cb->lookup) {
418
        int tmp = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
419
        int bits = ilog(cb->quantlist[0]);
420

    
421
        for (i = 1; i < tmp; i++)
422
            bits = FFMAX(bits, ilog(cb->quantlist[i]));
423

    
424
        put_float(pb, cb->min);
425
        put_float(pb, cb->delta);
426

    
427
        put_bits(pb, 4, bits - 1);
428
        put_bits(pb, 1, cb->seq_p);
429

    
430
        for (i = 0; i < tmp; i++)
431
            put_bits(pb, bits, cb->quantlist[i]);
432
    }
433
}
434

    
435
static void put_floor_header(PutBitContext * pb, vorbis_enc_floor * fc) {
436
    int i;
437

    
438
    put_bits(pb, 16, 1); // type, only floor1 is supported
439

    
440
    put_bits(pb, 5, fc->partitions);
441

    
442
    for (i = 0; i < fc->partitions; i++)
443
        put_bits(pb, 4, fc->partition_to_class[i]);
444

    
445
    for (i = 0; i < fc->nclasses; i++) {
446
        int j, books;
447

    
448
        put_bits(pb, 3, fc->classes[i].dim - 1);
449
        put_bits(pb, 2, fc->classes[i].subclass);
450

    
451
        if (fc->classes[i].subclass)
452
            put_bits(pb, 8, fc->classes[i].masterbook);
453

    
454
        books = (1 << fc->classes[i].subclass);
455

    
456
        for (j = 0; j < books; j++)
457
            put_bits(pb, 8, fc->classes[i].books[j] + 1);
458
    }
459

    
460
    put_bits(pb, 2, fc->multiplier - 1);
461
    put_bits(pb, 4, fc->rangebits);
462

    
463
    for (i = 2; i < fc->values; i++)
464
        put_bits(pb, fc->rangebits, fc->list[i].x);
465
}
466

    
467
static void put_residue_header(PutBitContext * pb, vorbis_enc_residue * rc) {
468
    int i;
469

    
470
    put_bits(pb, 16, rc->type);
471

    
472
    put_bits(pb, 24, rc->begin);
473
    put_bits(pb, 24, rc->end);
474
    put_bits(pb, 24, rc->partition_size - 1);
475
    put_bits(pb, 6, rc->classifications - 1);
476
    put_bits(pb, 8, rc->classbook);
477

    
478
    for (i = 0; i < rc->classifications; i++) {
479
        int j, tmp = 0;
480
        for (j = 0; j < 8; j++)
481
            tmp |= (rc->books[i][j] != -1) << j;
482

    
483
        put_bits(pb, 3, tmp & 7);
484
        put_bits(pb, 1, tmp > 7);
485

    
486
        if (tmp > 7)
487
            put_bits(pb, 5, tmp >> 3);
488
    }
489

    
490
    for (i = 0; i < rc->classifications; i++) {
491
        int j;
492
        for (j = 0; j < 8; j++)
493
            if (rc->books[i][j] != -1)
494
                put_bits(pb, 8, rc->books[i][j]);
495
    }
496
}
497

    
498
static int put_main_header(vorbis_enc_context * venc, uint8_t ** out) {
499
    int i;
500
    PutBitContext pb;
501
    uint8_t buffer[50000] = {0}, * p = buffer;
502
    int buffer_len = sizeof buffer;
503
    int len, hlens[3];
504

    
505
    // identification header
506
    init_put_bits(&pb, p, buffer_len);
507
    put_bits(&pb, 8, 1); //magic
508
    for (i = 0; "vorbis"[i]; i++)
509
        put_bits(&pb, 8, "vorbis"[i]);
510
    put_bits(&pb, 32, 0); // version
511
    put_bits(&pb, 8, venc->channels);
512
    put_bits(&pb, 32, venc->sample_rate);
513
    put_bits(&pb, 32, 0); // bitrate
514
    put_bits(&pb, 32, 0); // bitrate
515
    put_bits(&pb, 32, 0); // bitrate
516
    put_bits(&pb, 4, venc->log2_blocksize[0]);
517
    put_bits(&pb, 4, venc->log2_blocksize[1]);
518
    put_bits(&pb, 1, 1); // framing
519

    
520
    flush_put_bits(&pb);
521
    hlens[0] = (put_bits_count(&pb) + 7) / 8;
522
    buffer_len -= hlens[0];
523
    p += hlens[0];
524

    
525
    // comment header
526
    init_put_bits(&pb, p, buffer_len);
527
    put_bits(&pb, 8, 3); //magic
528
    for (i = 0; "vorbis"[i]; i++)
529
        put_bits(&pb, 8, "vorbis"[i]);
530
    put_bits(&pb, 32, 0); // vendor length TODO
531
    put_bits(&pb, 32, 0); // amount of comments
532
    put_bits(&pb, 1, 1); // framing
533

    
534
    flush_put_bits(&pb);
535
    hlens[1] = (put_bits_count(&pb) + 7) / 8;
536
    buffer_len -= hlens[1];
537
    p += hlens[1];
538

    
539
    // setup header
540
    init_put_bits(&pb, p, buffer_len);
541
    put_bits(&pb, 8, 5); //magic
542
    for (i = 0; "vorbis"[i]; i++)
543
        put_bits(&pb, 8, "vorbis"[i]);
544

    
545
    // codebooks
546
    put_bits(&pb, 8, venc->ncodebooks - 1);
547
    for (i = 0; i < venc->ncodebooks; i++)
548
        put_codebook_header(&pb, &venc->codebooks[i]);
549

    
550
    // time domain, reserved, zero
551
    put_bits(&pb, 6, 0);
552
    put_bits(&pb, 16, 0);
553

    
554
    // floors
555
    put_bits(&pb, 6, venc->nfloors - 1);
556
    for (i = 0; i < venc->nfloors; i++)
557
        put_floor_header(&pb, &venc->floors[i]);
558

    
559
    // residues
560
    put_bits(&pb, 6, venc->nresidues - 1);
561
    for (i = 0; i < venc->nresidues; i++)
562
        put_residue_header(&pb, &venc->residues[i]);
563

    
564
    // mappings
565
    put_bits(&pb, 6, venc->nmappings - 1);
566
    for (i = 0; i < venc->nmappings; i++) {
567
        vorbis_enc_mapping * mc = &venc->mappings[i];
568
        int j;
569
        put_bits(&pb, 16, 0); // mapping type
570

    
571
        put_bits(&pb, 1, mc->submaps > 1);
572
        if (mc->submaps > 1)
573
            put_bits(&pb, 4, mc->submaps - 1);
574

    
575
        put_bits(&pb, 1, !!mc->coupling_steps);
576
        if (mc->coupling_steps) {
577
            put_bits(&pb, 8, mc->coupling_steps - 1);
578
            for (j = 0; j < mc->coupling_steps; j++) {
579
                put_bits(&pb, ilog(venc->channels - 1), mc->magnitude[j]);
580
                put_bits(&pb, ilog(venc->channels - 1), mc->angle[j]);
581
            }
582
        }
583

    
584
        put_bits(&pb, 2, 0); // reserved
585

    
586
        if (mc->submaps > 1)
587
            for (j = 0; j < venc->channels; j++)
588
                put_bits(&pb, 4, mc->mux[j]);
589

    
590
        for (j = 0; j < mc->submaps; j++) {
591
            put_bits(&pb, 8, 0); // reserved time configuration
592
            put_bits(&pb, 8, mc->floor[j]);
593
            put_bits(&pb, 8, mc->residue[j]);
594
        }
595
    }
596

    
597
    // modes
598
    put_bits(&pb, 6, venc->nmodes - 1);
599
    for (i = 0; i < venc->nmodes; i++) {
600
        put_bits(&pb, 1, venc->modes[i].blockflag);
601
        put_bits(&pb, 16, 0); // reserved window type
602
        put_bits(&pb, 16, 0); // reserved transform type
603
        put_bits(&pb, 8, venc->modes[i].mapping);
604
    }
605

    
606
    put_bits(&pb, 1, 1); // framing
607

    
608
    flush_put_bits(&pb);
609
    hlens[2] = (put_bits_count(&pb) + 7) / 8;
610

    
611
    len = hlens[0] + hlens[1] + hlens[2];
612
    p = *out = av_mallocz(64 + len + len/255);
613

    
614
    *p++ = 2;
615
    p += av_xiphlacing(p, hlens[0]);
616
    p += av_xiphlacing(p, hlens[1]);
617
    buffer_len = 0;
618
    for (i = 0; i < 3; i++) {
619
        memcpy(p, buffer + buffer_len, hlens[i]);
620
        p += hlens[i];
621
        buffer_len += hlens[i];
622
    }
623

    
624
    return p - *out;
625
}
626

    
627
static float get_floor_average(vorbis_enc_floor * fc, float * coeffs, int i) {
628
    int begin = fc->list[fc->list[FFMAX(i-1, 0)].sort].x;
629
    int end   = fc->list[fc->list[FFMIN(i+1, fc->values - 1)].sort].x;
630
    int j;
631
    float average = 0;
632

    
633
    for (j = begin; j < end; j++)
634
        average += fabs(coeffs[j]);
635
    return average / (end - begin);
636
}
637

    
638
static void floor_fit(vorbis_enc_context * venc, vorbis_enc_floor * fc, float * coeffs, uint_fast16_t * posts, int samples) {
639
    int range = 255 / fc->multiplier + 1;
640
    int i;
641
    float tot_average = 0.;
642
    float averages[fc->values];
643
    for (i = 0; i < fc->values; i++){
644
        averages[i] = get_floor_average(fc, coeffs, i);
645
        tot_average += averages[i];
646
    }
647
    tot_average /= fc->values;
648
    tot_average /= venc->quality;
649

    
650
    for (i = 0; i < fc->values; i++) {
651
        int position = fc->list[fc->list[i].sort].x;
652
        float average = averages[i];
653
        int j;
654

    
655
        average *= pow(tot_average / average, 0.5) * pow(1.25, position/200.); // MAGIC!
656
        for (j = 0; j < range - 1; j++)
657
            if (ff_vorbis_floor1_inverse_db_table[j * fc->multiplier] > average) break;
658
        posts[fc->list[i].sort] = j;
659
    }
660
}
661

    
662
static int render_point(int x0, int y0, int x1, int y1, int x) {
663
    return y0 +  (x - x0) * (y1 - y0) / (x1 - x0);
664
}
665

    
666
static void floor_encode(vorbis_enc_context * venc, vorbis_enc_floor * fc, PutBitContext * pb, uint_fast16_t * posts, float * floor, int samples) {
667
    int range = 255 / fc->multiplier + 1;
668
    int coded[fc->values]; // first 2 values are unused
669
    int i, counter;
670

    
671
    put_bits(pb, 1, 1); // non zero
672
    put_bits(pb, ilog(range - 1), posts[0]);
673
    put_bits(pb, ilog(range - 1), posts[1]);
674
    coded[0] = coded[1] = 1;
675

    
676
    for (i = 2; i < fc->values; i++) {
677
        int predicted = render_point(fc->list[fc->list[i].low].x,
678
                                     posts[fc->list[i].low],
679
                                     fc->list[fc->list[i].high].x,
680
                                     posts[fc->list[i].high],
681
                                     fc->list[i].x);
682
        int highroom = range - predicted;
683
        int lowroom = predicted;
684
        int room = FFMIN(highroom, lowroom);
685
        if (predicted == posts[i]) {
686
            coded[i] = 0; // must be used later as flag!
687
            continue;
688
        } else {
689
            if (!coded[fc->list[i].low ]) coded[fc->list[i].low ] = -1;
690
            if (!coded[fc->list[i].high]) coded[fc->list[i].high] = -1;
691
        }
692
        if (posts[i] > predicted) {
693
            if (posts[i] - predicted > room)
694
                coded[i] = posts[i] - predicted + lowroom;
695
            else
696
                coded[i] = (posts[i] - predicted) << 1;
697
        } else {
698
            if (predicted - posts[i] > room)
699
                coded[i] = predicted - posts[i] + highroom - 1;
700
            else
701
                coded[i] = ((predicted - posts[i]) << 1) - 1;
702
        }
703
    }
704

    
705
    counter = 2;
706
    for (i = 0; i < fc->partitions; i++) {
707
        vorbis_enc_floor_class * c = &fc->classes[fc->partition_to_class[i]];
708
        int k, cval = 0, csub = 1<<c->subclass;
709
        if (c->subclass) {
710
            vorbis_enc_codebook * book = &venc->codebooks[c->masterbook];
711
            int cshift = 0;
712
            for (k = 0; k < c->dim; k++) {
713
                int l;
714
                for (l = 0; l < csub; l++) {
715
                    int maxval = 1;
716
                    if (c->books[l] != -1)
717
                        maxval = venc->codebooks[c->books[l]].nentries;
718
                    // coded could be -1, but this still works, cause that is 0
719
                    if (coded[counter + k] < maxval) break;
720
                }
721
                assert(l != csub);
722
                cval |= l << cshift;
723
                cshift += c->subclass;
724
            }
725
            put_codeword(pb, book, cval);
726
        }
727
        for (k = 0; k < c->dim; k++) {
728
            int book = c->books[cval & (csub-1)];
729
            int entry = coded[counter++];
730
            cval >>= c->subclass;
731
            if (book == -1) continue;
732
            if (entry == -1) entry = 0;
733
            put_codeword(pb, &venc->codebooks[book], entry);
734
        }
735
    }
736

    
737
    ff_vorbis_floor1_render_list(fc->list, fc->values, posts, coded, fc->multiplier, floor, samples);
738
}
739

    
740
static float * put_vector(vorbis_enc_codebook * book, PutBitContext * pb, float * num) {
741
    int i, entry = -1;
742
    float distance = FLT_MAX;
743
    assert(book->dimentions);
744
    for (i = 0; i < book->nentries; i++) {
745
        float * vec = book->dimentions + i * book->ndimentions, d = book->pow2[i];
746
        int j;
747
        if (!book->lens[i]) continue;
748
        for (j = 0; j < book->ndimentions; j++)
749
            d -= vec[j] * num[j];
750
        if (distance > d) {
751
            entry = i;
752
            distance = d;
753
        }
754
    }
755
    put_codeword(pb, book, entry);
756
    return &book->dimentions[entry * book->ndimentions];
757
}
758

    
759
static void residue_encode(vorbis_enc_context * venc, vorbis_enc_residue * rc, PutBitContext * pb, float * coeffs, int samples, int real_ch) {
760
    int pass, i, j, p, k;
761
    int psize = rc->partition_size;
762
    int partitions = (rc->end - rc->begin) / psize;
763
    int channels = (rc->type == 2) ? 1 : real_ch;
764
    int classes[channels][partitions];
765
    int classwords = venc->codebooks[rc->classbook].ndimentions;
766

    
767
    assert(rc->type == 2);
768
    assert(real_ch == 2);
769
    for (p = 0; p < partitions; p++) {
770
        float max1 = 0., max2 = 0.;
771
        int s = rc->begin + p * psize;
772
        for (k = s; k < s + psize; k += 2) {
773
            max1 = FFMAX(max1, fabs(coeffs[          k / real_ch]));
774
            max2 = FFMAX(max2, fabs(coeffs[samples + k / real_ch]));
775
        }
776

    
777
        for (i = 0; i < rc->classifications - 1; i++) {
778
            if (max1 < rc->maxes[i][0] && max2 < rc->maxes[i][1]) break;
779
        }
780
        classes[0][p] = i;
781
    }
782

    
783
    for (pass = 0; pass < 8; pass++) {
784
        p = 0;
785
        while (p < partitions) {
786
            if (pass == 0)
787
                for (j = 0; j < channels; j++) {
788
                    vorbis_enc_codebook * book = &venc->codebooks[rc->classbook];
789
                    int entry = 0;
790
                    for (i = 0; i < classwords; i++) {
791
                        entry *= rc->classifications;
792
                        entry += classes[j][p + i];
793
                    }
794
                    put_codeword(pb, book, entry);
795
                }
796
            for (i = 0; i < classwords && p < partitions; i++, p++) {
797
                for (j = 0; j < channels; j++) {
798
                    int nbook = rc->books[classes[j][p]][pass];
799
                    vorbis_enc_codebook * book = &venc->codebooks[nbook];
800
                    float * buf = coeffs + samples*j + rc->begin + p*psize;
801
                    if (nbook == -1) continue;
802

    
803
                    assert(rc->type == 0 || rc->type == 2);
804
                    assert(!(psize % book->ndimentions));
805

    
806
                    if (rc->type == 0) {
807
                        for (k = 0; k < psize; k += book->ndimentions) {
808
                            float * a = put_vector(book, pb, &buf[k]);
809
                            int l;
810
                            for (l = 0; l < book->ndimentions; l++)
811
                                buf[k + l] -= a[l];
812
                        }
813
                    } else {
814
                        int s = rc->begin + p * psize, a1, b1;
815
                        a1 = (s % real_ch) * samples;
816
                        b1 =  s / real_ch;
817
                        s = real_ch * samples;
818
                        for (k = 0; k < psize; k += book->ndimentions) {
819
                            int dim, a2 = a1, b2 = b1;
820
                            float vec[book->ndimentions], * pv = vec;
821
                            for (dim = book->ndimentions; dim--; ) {
822
                                *pv++ = coeffs[a2 + b2];
823
                                if ((a2 += samples) == s) {
824
                                    a2=0;
825
                                    b2++;
826
                                }
827
                            }
828
                            pv = put_vector(book, pb, vec);
829
                            for (dim = book->ndimentions; dim--; ) {
830
                                coeffs[a1 + b1] -= *pv++;
831
                                if ((a1 += samples) == s) {
832
                                    a1=0;
833
                                    b1++;
834
                                }
835
                            }
836
                        }
837
                    }
838
                }
839
            }
840
        }
841
    }
842
}
843

    
844
static int apply_window_and_mdct(vorbis_enc_context * venc, signed short * audio, int samples) {
845
    int i, j, channel;
846
    const float * win = venc->win[0];
847
    int window_len = 1 << (venc->log2_blocksize[0] - 1);
848
    float n = (float)(1 << venc->log2_blocksize[0]) / 4.;
849
    // FIXME use dsp
850

    
851
    if (!venc->have_saved && !samples) return 0;
852

    
853
    if (venc->have_saved) {
854
        for (channel = 0; channel < venc->channels; channel++) {
855
            memcpy(venc->samples + channel*window_len*2, venc->saved + channel*window_len, sizeof(float)*window_len);
856
        }
857
    } else {
858
        for (channel = 0; channel < venc->channels; channel++) {
859
            memset(venc->samples + channel*window_len*2, 0, sizeof(float)*window_len);
860
        }
861
    }
862

    
863
    if (samples) {
864
        for (channel = 0; channel < venc->channels; channel++) {
865
            float * offset = venc->samples + channel*window_len*2 + window_len;
866
            j = channel;
867
            for (i = 0; i < samples; i++, j += venc->channels)
868
                offset[i] = -audio[j] / 32768. / n * win[window_len - i - 1]; //FIXME find out why the sign has to be fliped
869
        }
870
    } else {
871
        for (channel = 0; channel < venc->channels; channel++) {
872
            memset(venc->samples + channel*window_len*2 + window_len, 0, sizeof(float)*window_len);
873
        }
874
    }
875

    
876
    for (channel = 0; channel < venc->channels; channel++) {
877
        ff_mdct_calc(&venc->mdct[0], venc->coeffs + channel*window_len, venc->samples + channel*window_len*2);
878
    }
879

    
880
    if (samples) {
881
        for (channel = 0; channel < venc->channels; channel++) {
882
            float * offset = venc->saved + channel*window_len;
883
            j = channel;
884
            for (i = 0; i < samples; i++, j += venc->channels)
885
                offset[i] = -audio[j] / 32768. / n * win[i]; //FIXME find out why the sign has to be fliped
886
        }
887
        venc->have_saved = 1;
888
    } else {
889
        venc->have_saved = 0;
890
    }
891
    return 1;
892
}
893

    
894
static av_cold int vorbis_encode_init(AVCodecContext * avccontext)
895
{
896
    vorbis_enc_context * venc = avccontext->priv_data;
897

    
898
    if (avccontext->channels != 2) {
899
        av_log(avccontext, AV_LOG_ERROR, "Current FFmpeg Vorbis encoder only supports 2 channels.\n");
900
        return -1;
901
    }
902

    
903
    create_vorbis_context(venc, avccontext);
904

    
905
    if (avccontext->flags & CODEC_FLAG_QSCALE)
906
        venc->quality = avccontext->global_quality / (float)FF_QP2LAMBDA / 10.;
907
    else
908
        venc->quality = 1.;
909
    venc->quality *= venc->quality;
910

    
911
    avccontext->extradata_size = put_main_header(venc, (uint8_t**)&avccontext->extradata);
912

    
913
    avccontext->frame_size = 1 << (venc->log2_blocksize[0] - 1);
914

    
915
    avccontext->coded_frame = avcodec_alloc_frame();
916
    avccontext->coded_frame->key_frame = 1;
917

    
918
    return 0;
919
}
920

    
921
static int vorbis_encode_frame(AVCodecContext * avccontext, unsigned char * packets, int buf_size, void *data)
922
{
923
    vorbis_enc_context * venc = avccontext->priv_data;
924
    signed short * audio = data;
925
    int samples = data ? avccontext->frame_size : 0;
926
    vorbis_enc_mode * mode;
927
    vorbis_enc_mapping * mapping;
928
    PutBitContext pb;
929
    int i;
930

    
931
    if (!apply_window_and_mdct(venc, audio, samples)) return 0;
932
    samples = 1 << (venc->log2_blocksize[0] - 1);
933

    
934
    init_put_bits(&pb, packets, buf_size);
935

    
936
    put_bits(&pb, 1, 0); // magic bit
937

    
938
    put_bits(&pb, ilog(venc->nmodes - 1), 0); // 0 bits, the mode
939

    
940
    mode = &venc->modes[0];
941
    mapping = &venc->mappings[mode->mapping];
942
    if (mode->blockflag) {
943
        put_bits(&pb, 1, 0);
944
        put_bits(&pb, 1, 0);
945
    }
946

    
947
    for (i = 0; i < venc->channels; i++) {
948
        vorbis_enc_floor * fc = &venc->floors[mapping->floor[mapping->mux[i]]];
949
        uint_fast16_t posts[fc->values];
950
        floor_fit(venc, fc, &venc->coeffs[i * samples], posts, samples);
951
        floor_encode(venc, fc, &pb, posts, &venc->floor[i * samples], samples);
952
    }
953

    
954
    for (i = 0; i < venc->channels * samples; i++) {
955
        venc->coeffs[i] /= venc->floor[i];
956
    }
957

    
958
    for (i = 0; i < mapping->coupling_steps; i++) {
959
        float * mag = venc->coeffs + mapping->magnitude[i] * samples;
960
        float * ang = venc->coeffs + mapping->angle[i] * samples;
961
        int j;
962
        for (j = 0; j < samples; j++) {
963
            float a = ang[j];
964
            ang[j] -= mag[j];
965
            if (mag[j] > 0) ang[j] = -ang[j];
966
            if (ang[j] < 0) mag[j] = a;
967
        }
968
    }
969

    
970
    residue_encode(venc, &venc->residues[mapping->residue[mapping->mux[0]]], &pb, venc->coeffs, samples, venc->channels);
971

    
972
    avccontext->coded_frame->pts = venc->sample_count;
973
    venc->sample_count += avccontext->frame_size;
974
    flush_put_bits(&pb);
975
    return (put_bits_count(&pb) + 7) / 8;
976
}
977

    
978

    
979
static av_cold int vorbis_encode_close(AVCodecContext * avccontext)
980
{
981
    vorbis_enc_context * venc = avccontext->priv_data;
982
    int i;
983

    
984
    if (venc->codebooks)
985
        for (i = 0; i < venc->ncodebooks; i++) {
986
            av_freep(&venc->codebooks[i].lens);
987
            av_freep(&venc->codebooks[i].codewords);
988
            av_freep(&venc->codebooks[i].quantlist);
989
            av_freep(&venc->codebooks[i].dimentions);
990
            av_freep(&venc->codebooks[i].pow2);
991
        }
992
    av_freep(&venc->codebooks);
993

    
994
    if (venc->floors)
995
        for (i = 0; i < venc->nfloors; i++) {
996
            int j;
997
            if (venc->floors[i].classes)
998
                for (j = 0; j < venc->floors[i].nclasses; j++)
999
                    av_freep(&venc->floors[i].classes[j].books);
1000
            av_freep(&venc->floors[i].classes);
1001
            av_freep(&venc->floors[i].partition_to_class);
1002
            av_freep(&venc->floors[i].list);
1003
        }
1004
    av_freep(&venc->floors);
1005

    
1006
    if (venc->residues)
1007
        for (i = 0; i < venc->nresidues; i++) {
1008
            av_freep(&venc->residues[i].books);
1009
            av_freep(&venc->residues[i].maxes);
1010
        }
1011
    av_freep(&venc->residues);
1012

    
1013
    if (venc->mappings)
1014
        for (i = 0; i < venc->nmappings; i++) {
1015
            av_freep(&venc->mappings[i].mux);
1016
            av_freep(&venc->mappings[i].floor);
1017
            av_freep(&venc->mappings[i].residue);
1018
            av_freep(&venc->mappings[i].magnitude);
1019
            av_freep(&venc->mappings[i].angle);
1020
        }
1021
    av_freep(&venc->mappings);
1022

    
1023
    av_freep(&venc->modes);
1024

    
1025
    av_freep(&venc->saved);
1026
    av_freep(&venc->samples);
1027
    av_freep(&venc->floor);
1028
    av_freep(&venc->coeffs);
1029

    
1030
    ff_mdct_end(&venc->mdct[0]);
1031
    ff_mdct_end(&venc->mdct[1]);
1032

    
1033
    av_freep(&avccontext->coded_frame);
1034
    av_freep(&avccontext->extradata);
1035

    
1036
    return 0 ;
1037
}
1038

    
1039
AVCodec vorbis_encoder = {
1040
    "vorbis",
1041
    CODEC_TYPE_AUDIO,
1042
    CODEC_ID_VORBIS,
1043
    sizeof(vorbis_enc_context),
1044
    vorbis_encode_init,
1045
    vorbis_encode_frame,
1046
    vorbis_encode_close,
1047
    .capabilities= CODEC_CAP_DELAY,
1048
    .sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
1049
    .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1050
};