vorbis: Rename decoder/encoder files to follow general file naming scheme.

1 files changed, 1116 insertions, 0 deletions

diff --git a/libavcodec/vorbisenc.c b/libavcodec/vorbisenc.c
new file mode 100644
index 0000000000..74933af4d5
--- /dev/null
+++ b/libavcodec/vorbisenc.c
@@ -0,0 +1,1116 @@
+/*
+ * copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * Native Vorbis encoder.
+ * @author Oded Shimon <ods15@ods15.dyndns.org>
+ */
+
+#include <float.h>
+#include "avcodec.h"
+#include "dsputil.h"
+#include "fft.h"
+#include "vorbis.h"
+#include "vorbis_enc_data.h"
+
+#define BITSTREAM_WRITER_LE
+#include "put_bits.h"
+
+#undef NDEBUG
+#include <assert.h>
+
+typedef struct {
+    int nentries;
+    uint8_t *lens;
+    uint32_t *codewords;
+    int ndimentions;
+    float min;
+    float delta;
+    int seq_p;
+    int lookup;
+    int *quantlist;
+    float *dimentions;
+    float *pow2;
+} vorbis_enc_codebook;
+
+typedef struct {
+    int dim;
+    int subclass;
+    int masterbook;
+    int *books;
+} vorbis_enc_floor_class;
+
+typedef struct {
+    int partitions;
+    int *partition_to_class;
+    int nclasses;
+    vorbis_enc_floor_class *classes;
+    int multiplier;
+    int rangebits;
+    int values;
+    vorbis_floor1_entry *list;
+} vorbis_enc_floor;
+
+typedef struct {
+    int type;
+    int begin;
+    int end;
+    int partition_size;
+    int classifications;
+    int classbook;
+    int8_t (*books)[8];
+    float (*maxes)[2];
+} vorbis_enc_residue;
+
+typedef struct {
+    int submaps;
+    int *mux;
+    int *floor;
+    int *residue;
+    int coupling_steps;
+    int *magnitude;
+    int *angle;
+} vorbis_enc_mapping;
+
+typedef struct {
+    int blockflag;
+    int mapping;
+} vorbis_enc_mode;
+
+typedef struct {
+    int channels;
+    int sample_rate;
+    int log2_blocksize[2];
+    FFTContext mdct[2];
+    const float *win[2];
+    int have_saved;
+    float *saved;
+    float *samples;
+    float *floor;  // also used for tmp values for mdct
+    float *coeffs; // also used for residue after floor
+    float quality;
+
+    int ncodebooks;
+    vorbis_enc_codebook *codebooks;
+
+    int nfloors;
+    vorbis_enc_floor *floors;
+
+    int nresidues;
+    vorbis_enc_residue *residues;
+
+    int nmappings;
+    vorbis_enc_mapping *mappings;
+
+    int nmodes;
+    vorbis_enc_mode *modes;
+
+    int64_t sample_count;
+} vorbis_enc_context;
+
+#define MAX_CHANNELS     2
+#define MAX_CODEBOOK_DIM 8
+
+#define MAX_FLOOR_CLASS_DIM  4
+#define NUM_FLOOR_PARTITIONS 8
+#define MAX_FLOOR_VALUES     (MAX_FLOOR_CLASS_DIM*NUM_FLOOR_PARTITIONS+2)
+
+#define RESIDUE_SIZE           1600
+#define RESIDUE_PART_SIZE      32
+#define NUM_RESIDUE_PARTITIONS (RESIDUE_SIZE/RESIDUE_PART_SIZE)
+
+static inline void put_codeword(PutBitContext *pb, vorbis_enc_codebook *cb,
+                                int entry)
+{
+    assert(entry >= 0);
+    assert(entry < cb->nentries);
+    assert(cb->lens[entry]);
+    put_bits(pb, cb->lens[entry], cb->codewords[entry]);
+}
+
+static int cb_lookup_vals(int lookup, int dimentions, int entries)
+{
+    if (lookup == 1)
+        return ff_vorbis_nth_root(entries, dimentions);
+    else if (lookup == 2)
+        return dimentions *entries;
+    return 0;
+}
+
+static void ready_codebook(vorbis_enc_codebook *cb)
+{
+    int i;
+
+    ff_vorbis_len2vlc(cb->lens, cb->codewords, cb->nentries);
+
+    if (!cb->lookup) {
+        cb->pow2 = cb->dimentions = NULL;
+    } else {
+        int vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
+        cb->dimentions = av_malloc(sizeof(float) * cb->nentries * cb->ndimentions);
+        cb->pow2 = av_mallocz(sizeof(float) * cb->nentries);
+        for (i = 0; i < cb->nentries; i++) {
+            float last = 0;
+            int j;
+            int div = 1;
+            for (j = 0; j < cb->ndimentions; j++) {
+                int off;
+                if (cb->lookup == 1)
+                    off = (i / div) % vals; // lookup type 1
+                else
+                    off = i * cb->ndimentions + j; // lookup type 2
+
+                cb->dimentions[i * cb->ndimentions + j] = last + cb->min + cb->quantlist[off] * cb->delta;
+                if (cb->seq_p)
+                    last = cb->dimentions[i * cb->ndimentions + j];
+                cb->pow2[i] += cb->dimentions[i * cb->ndimentions + j] * cb->dimentions[i * cb->ndimentions + j];
+                div *= vals;
+            }
+            cb->pow2[i] /= 2.;
+        }
+    }
+}
+
+static void ready_residue(vorbis_enc_residue *rc, vorbis_enc_context *venc)
+{
+    int i;
+    assert(rc->type == 2);
+    rc->maxes = av_mallocz(sizeof(float[2]) * rc->classifications);
+    for (i = 0; i < rc->classifications; i++) {
+        int j;
+        vorbis_enc_codebook * cb;
+        for (j = 0; j < 8; j++)
+            if (rc->books[i][j] != -1)
+                break;
+        if (j == 8) // zero
+            continue;
+        cb = &venc->codebooks[rc->books[i][j]];
+        assert(cb->ndimentions >= 2);
+        assert(cb->lookup);
+
+        for (j = 0; j < cb->nentries; j++) {
+            float a;
+            if (!cb->lens[j])
+                continue;
+            a = fabs(cb->dimentions[j * cb->ndimentions]);
+            if (a > rc->maxes[i][0])
+                rc->maxes[i][0] = a;
+            a = fabs(cb->dimentions[j * cb->ndimentions + 1]);
+            if (a > rc->maxes[i][1])
+                rc->maxes[i][1] = a;
+        }
+    }
+    // small bias
+    for (i = 0; i < rc->classifications; i++) {
+        rc->maxes[i][0] += 0.8;
+        rc->maxes[i][1] += 0.8;
+    }
+}
+
+static void create_vorbis_context(vorbis_enc_context *venc,
+                                  AVCodecContext *avccontext)
+{
+    vorbis_enc_floor   *fc;
+    vorbis_enc_residue *rc;
+    vorbis_enc_mapping *mc;
+    int i, book;
+
+    venc->channels    = avccontext->channels;
+    venc->sample_rate = avccontext->sample_rate;
+    venc->log2_blocksize[0] = venc->log2_blocksize[1] = 11;
+
+    venc->ncodebooks = FF_ARRAY_ELEMS(cvectors);
+    venc->codebooks  = av_malloc(sizeof(vorbis_enc_codebook) * venc->ncodebooks);
+
+    // codebook 0..14 - floor1 book, values 0..255
+    // codebook 15 residue masterbook
+    // codebook 16..29 residue
+    for (book = 0; book < venc->ncodebooks; book++) {
+        vorbis_enc_codebook *cb = &venc->codebooks[book];
+        int vals;
+        cb->ndimentions = cvectors[book].dim;
+        cb->nentries    = cvectors[book].real_len;
+        cb->min         = cvectors[book].min;
+        cb->delta       = cvectors[book].delta;
+        cb->lookup      = cvectors[book].lookup;
+        cb->seq_p       = 0;
+
+        cb->lens      = av_malloc(sizeof(uint8_t)  * cb->nentries);
+        cb->codewords = av_malloc(sizeof(uint32_t) * cb->nentries);
+        memcpy(cb->lens, cvectors[book].clens, cvectors[book].len);
+        memset(cb->lens + cvectors[book].len, 0, cb->nentries - cvectors[book].len);
+
+        if (cb->lookup) {
+            vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
+            cb->quantlist = av_malloc(sizeof(int) * vals);
+            for (i = 0; i < vals; i++)
+                cb->quantlist[i] = cvectors[book].quant[i];
+        } else {
+            cb->quantlist = NULL;
+        }
+        ready_codebook(cb);
+    }
+
+    venc->nfloors = 1;
+    venc->floors  = av_malloc(sizeof(vorbis_enc_floor) * venc->nfloors);
+
+    // just 1 floor
+    fc = &venc->floors[0];
+    fc->partitions         = NUM_FLOOR_PARTITIONS;
+    fc->partition_to_class = av_malloc(sizeof(int) * fc->partitions);
+    fc->nclasses           = 0;
+    for (i = 0; i < fc->partitions; i++) {
+        static const int a[] = {0, 1, 2, 2, 3, 3, 4, 4};
+        fc->partition_to_class[i] = a[i];
+        fc->nclasses = FFMAX(fc->nclasses, fc->partition_to_class[i]);
+    }
+    fc->nclasses++;
+    fc->classes = av_malloc(sizeof(vorbis_enc_floor_class) * fc->nclasses);
+    for (i = 0; i < fc->nclasses; i++) {
+        vorbis_enc_floor_class * c = &fc->classes[i];
+        int j, books;
+        c->dim        = floor_classes[i].dim;
+        c->subclass   = floor_classes[i].subclass;
+        c->masterbook = floor_classes[i].masterbook;
+        books         = (1 << c->subclass);
+        c->books      = av_malloc(sizeof(int) * books);
+        for (j = 0; j < books; j++)
+            c->books[j] = floor_classes[i].nbooks[j];
+    }
+    fc->multiplier = 2;
+    fc->rangebits  = venc->log2_blocksize[0] - 1;
+
+    fc->values = 2;
+    for (i = 0; i < fc->partitions; i++)
+        fc->values += fc->classes[fc->partition_to_class[i]].dim;
+
+    fc->list = av_malloc(sizeof(vorbis_floor1_entry) * fc->values);
+    fc->list[0].x = 0;
+    fc->list[1].x = 1 << fc->rangebits;
+    for (i = 2; i < fc->values; i++) {
+        static const int a[] = {
+             93, 23,372,  6, 46,186,750, 14, 33, 65,
+            130,260,556,  3, 10, 18, 28, 39, 55, 79,
+            111,158,220,312,464,650,850
+        };
+        fc->list[i].x = a[i - 2];
+    }
+    ff_vorbis_ready_floor1_list(fc->list, fc->values);
+
+    venc->nresidues = 1;
+    venc->residues  = av_malloc(sizeof(vorbis_enc_residue) * venc->nresidues);
+
+    // single residue
+    rc = &venc->residues[0];
+    rc->type            = 2;
+    rc->begin           = 0;
+    rc->end             = 1600;
+    rc->partition_size  = 32;
+    rc->classifications = 10;
+    rc->classbook       = 15;
+    rc->books           = av_malloc(sizeof(*rc->books) * rc->classifications);
+    {
+        static const int8_t a[10][8] = {
+            { -1, -1, -1, -1, -1, -1, -1, -1, },
+            { -1, -1, 16, -1, -1, -1, -1, -1, },
+            { -1, -1, 17, -1, -1, -1, -1, -1, },
+            { -1, -1, 18, -1, -1, -1, -1, -1, },
+            { -1, -1, 19, -1, -1, -1, -1, -1, },
+            { -1, -1, 20, -1, -1, -1, -1, -1, },
+            { -1, -1, 21, -1, -1, -1, -1, -1, },
+            { 22, 23, -1, -1, -1, -1, -1, -1, },
+            { 24, 25, -1, -1, -1, -1, -1, -1, },
+            { 26, 27, 28, -1, -1, -1, -1, -1, },
+        };
+        memcpy(rc->books, a, sizeof a);
+    }
+    ready_residue(rc, venc);
+
+    venc->nmappings = 1;
+    venc->mappings  = av_malloc(sizeof(vorbis_enc_mapping) * venc->nmappings);
+
+    // single mapping
+    mc = &venc->mappings[0];
+    mc->submaps = 1;
+    mc->mux     = av_malloc(sizeof(int) * venc->channels);
+    for (i = 0; i < venc->channels; i++)
+        mc->mux[i] = 0;
+    mc->floor   = av_malloc(sizeof(int) * mc->submaps);
+    mc->residue = av_malloc(sizeof(int) * mc->submaps);
+    for (i = 0; i < mc->submaps; i++) {
+        mc->floor[i]   = 0;
+        mc->residue[i] = 0;
+    }
+    mc->coupling_steps = venc->channels == 2 ? 1 : 0;
+    mc->magnitude      = av_malloc(sizeof(int) * mc->coupling_steps);
+    mc->angle          = av_malloc(sizeof(int) * mc->coupling_steps);
+    if (mc->coupling_steps) {
+        mc->magnitude[0] = 0;
+        mc->angle[0]     = 1;
+    }
+
+    venc->nmodes = 1;
+    venc->modes  = av_malloc(sizeof(vorbis_enc_mode) * venc->nmodes);
+
+    // single mode
+    venc->modes[0].blockflag = 0;
+    venc->modes[0].mapping   = 0;
+
+    venc->have_saved = 0;
+    venc->saved      = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
+    venc->samples    = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]));
+    venc->floor      = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
+    venc->coeffs     = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
+
+    venc->win[0] = ff_vorbis_vwin[venc->log2_blocksize[0] - 6];
+    venc->win[1] = ff_vorbis_vwin[venc->log2_blocksize[1] - 6];
+
+    ff_mdct_init(&venc->mdct[0], venc->log2_blocksize[0], 0, 1.0);
+    ff_mdct_init(&venc->mdct[1], venc->log2_blocksize[1], 0, 1.0);
+}
+
+static void put_float(PutBitContext *pb, float f)
+{
+    int exp, mant;
+    uint32_t res = 0;
+    mant = (int)ldexp(frexp(f, &exp), 20);
+    exp += 788 - 20;
+    if (mant < 0) {
+        res |= (1U << 31);
+        mant = -mant;
+    }
+    res |= mant | (exp << 21);
+    put_bits32(pb, res);
+}
+
+static void put_codebook_header(PutBitContext *pb, vorbis_enc_codebook *cb)
+{
+    int i;
+    int ordered = 0;
+
+    put_bits(pb, 24, 0x564342); //magic
+    put_bits(pb, 16, cb->ndimentions);
+    put_bits(pb, 24, cb->nentries);
+
+    for (i = 1; i < cb->nentries; i++)
+        if (cb->lens[i] < cb->lens[i-1])
+            break;
+    if (i == cb->nentries)
+        ordered = 1;
+
+    put_bits(pb, 1, ordered);
+    if (ordered) {
+        int len = cb->lens[0];
+        put_bits(pb, 5, len - 1);
+        i = 0;
+        while (i < cb->nentries) {
+            int j;
+            for (j = 0; j+i < cb->nentries; j++)
+                if (cb->lens[j+i] != len)
+                    break;
+            put_bits(pb, ilog(cb->nentries - i), j);
+            i += j;
+            len++;
+        }
+    } else {
+        int sparse = 0;
+        for (i = 0; i < cb->nentries; i++)
+            if (!cb->lens[i])
+                break;
+        if (i != cb->nentries)
+            sparse = 1;
+        put_bits(pb, 1, sparse);
+
+        for (i = 0; i < cb->nentries; i++) {
+            if (sparse)
+                put_bits(pb, 1, !!cb->lens[i]);
+            if (cb->lens[i])
+                put_bits(pb, 5, cb->lens[i] - 1);
+        }
+    }
+
+    put_bits(pb, 4, cb->lookup);
+    if (cb->lookup) {
+        int tmp  = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
+        int bits = ilog(cb->quantlist[0]);
+
+        for (i = 1; i < tmp; i++)
+            bits = FFMAX(bits, ilog(cb->quantlist[i]));
+
+        put_float(pb, cb->min);
+        put_float(pb, cb->delta);
+
+        put_bits(pb, 4, bits - 1);
+        put_bits(pb, 1, cb->seq_p);
+
+        for (i = 0; i < tmp; i++)
+            put_bits(pb, bits, cb->quantlist[i]);
+    }
+}
+
+static void put_floor_header(PutBitContext *pb, vorbis_enc_floor *fc)
+{
+    int i;
+
+    put_bits(pb, 16, 1); // type, only floor1 is supported
+
+    put_bits(pb, 5, fc->partitions);
+
+    for (i = 0; i < fc->partitions; i++)
+        put_bits(pb, 4, fc->partition_to_class[i]);
+
+    for (i = 0; i < fc->nclasses; i++) {
+        int j, books;
+
+        put_bits(pb, 3, fc->classes[i].dim - 1);
+        put_bits(pb, 2, fc->classes[i].subclass);
+
+        if (fc->classes[i].subclass)
+            put_bits(pb, 8, fc->classes[i].masterbook);
+
+        books = (1 << fc->classes[i].subclass);
+
+        for (j = 0; j < books; j++)
+            put_bits(pb, 8, fc->classes[i].books[j] + 1);
+    }
+
+    put_bits(pb, 2, fc->multiplier - 1);
+    put_bits(pb, 4, fc->rangebits);
+
+    for (i = 2; i < fc->values; i++)
+        put_bits(pb, fc->rangebits, fc->list[i].x);
+}
+
+static void put_residue_header(PutBitContext *pb, vorbis_enc_residue *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(vorbis_enc_context *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_bits32(&pb, 0); // version
+    put_bits(&pb,  8, venc->channels);
+    put_bits32(&pb, venc->sample_rate);
+    put_bits32(&pb, 0); // bitrate
+    put_bits32(&pb, 0); // bitrate
+    put_bits32(&pb, 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) >> 3;
+    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_bits32(&pb, 0); // vendor length TODO
+    put_bits32(&pb, 0); // amount of comments
+    put_bits(&pb,  1, 1); // framing
+
+    flush_put_bits(&pb);
+    hlens[1] = put_bits_count(&pb) >> 3;
+    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++) {
+        vorbis_enc_mapping *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) >> 3;
+
+    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(vorbis_enc_floor * 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(vorbis_enc_context *venc, vorbis_enc_floor *fc,
+                      float *coeffs, uint_fast16_t *posts, int samples)
+{
+    int range = 255 / fc->multiplier + 1;
+    int i;
+    float tot_average = 0.;
+    float averages[MAX_FLOOR_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 = sqrt(tot_average * average) * pow(1.25f, position*0.005f); // 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(vorbis_enc_context *venc, vorbis_enc_floor *fc,
+                         PutBitContext *pb, uint_fast16_t *posts,
+                         float *floor, int samples)
+{
+    int range = 255 / fc->multiplier + 1;
+    int coded[MAX_FLOOR_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++) {
+        vorbis_enc_floor_class * c = &fc->classes[fc->partition_to_class[i]];
+        int k, cval = 0, csub = 1<<c->subclass;
+        if (c->subclass) {
+            vorbis_enc_codebook * 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(vorbis_enc_codebook *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(vorbis_enc_context *venc, vorbis_enc_residue *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[MAX_CHANNELS][NUM_RESIDUE_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++) {
+                    vorbis_enc_codebook * 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];
+                    vorbis_enc_codebook * 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[MAX_CODEBOOK_DIM], *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(vorbis_enc_context *venc, const 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];
+        }
+    } 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++)
+        venc->mdct[0].mdct_calc(&venc->mdct[0], venc->coeffs + channel * window_len,
+                     venc->samples + channel * window_len * 2);
+
+    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];
+        }
+        venc->have_saved = 1;
+    } else {
+        venc->have_saved = 0;
+    }
+    return 1;
+}
+
+static av_cold int vorbis_encode_init(AVCodecContext *avccontext)
+{
+    vorbis_enc_context *venc = avccontext->priv_data;
+
+    if (avccontext->channels != 2) {
+        av_log(avccontext, AV_LOG_ERROR, "Current Libav Vorbis encoder only supports 2 channels.\n");
+        return -1;
+    }
+
+    create_vorbis_context(venc, avccontext);
+
+    if (avccontext->flags & CODEC_FLAG_QSCALE)
+        venc->quality = avccontext->global_quality / (float)FF_QP2LAMBDA / 10.;
+    else
+        venc->quality = 0.03;
+    venc->quality *= venc->quality;
+
+    avccontext->extradata_size = put_main_header(venc, (uint8_t**)&avccontext->extradata);
+
+    avccontext->frame_size     = 1 << (venc->log2_blocksize[0] - 1);
+
+    avccontext->coded_frame            = avcodec_alloc_frame();
+    avccontext->coded_frame->key_frame = 1;
+
+    return 0;
+}
+
+static int vorbis_encode_frame(AVCodecContext *avccontext,
+                               unsigned char *packets,
+                               int buf_size, void *data)
+{
+    vorbis_enc_context *venc = avccontext->priv_data;
+    const signed short *audio = data;
+    int samples = data ? avccontext->frame_size : 0;
+    vorbis_enc_mode *mode;
+    vorbis_enc_mapping *mapping;
+    PutBitContext pb;
+    int i;
+
+    if (!apply_window_and_mdct(venc, audio, samples))
+        return 0;
+    samples = 1 << (venc->log2_blocksize[0] - 1);
+
+    init_put_bits(&pb, packets, buf_size);
+
+    put_bits(&pb, 1, 0); // magic bit
+
+    put_bits(&pb, ilog(venc->nmodes - 1), 0); // 0 bits, the mode
+
+    mode    = &venc->modes[0];
+    mapping = &venc->mappings[mode->mapping];
+    if (mode->blockflag) {
+        put_bits(&pb, 1, 0);
+        put_bits(&pb, 1, 0);
+    }
+
+    for (i = 0; i < venc->channels; i++) {
+        vorbis_enc_floor *fc = &venc->floors[mapping->floor[mapping->mux[i]]];
+        uint_fast16_t posts[MAX_FLOOR_VALUES];
+        floor_fit(venc, fc, &venc->coeffs[i * samples], posts, samples);
+        floor_encode(venc, fc, &pb, posts, &venc->floor[i * samples], samples);
+    }
+
+    for (i = 0; i < venc->channels * samples; i++)
+        venc->coeffs[i] /= venc->floor[i];
+
+    for (i = 0; i < mapping->coupling_steps; i++) {
+        float *mag = venc->coeffs + mapping->magnitude[i] * samples;
+        float *ang = venc->coeffs + mapping->angle[i]     * samples;
+        int j;
+        for (j = 0; j < samples; j++) {
+            float a = ang[j];
+            ang[j] -= mag[j];
+            if (mag[j] > 0)
+                ang[j] = -ang[j];
+            if (ang[j] < 0)
+                mag[j] = a;
+        }
+    }
+
+    residue_encode(venc, &venc->residues[mapping->residue[mapping->mux[0]]],
+                   &pb, venc->coeffs, samples, venc->channels);
+
+    avccontext->coded_frame->pts = venc->sample_count;
+    venc->sample_count += avccontext->frame_size;
+    flush_put_bits(&pb);
+    return put_bits_count(&pb) >> 3;
+}
+
+
+static av_cold int vorbis_encode_close(AVCodecContext *avccontext)
+{
+    vorbis_enc_context *venc = avccontext->priv_data;
+    int i;
+
+    if (venc->codebooks)
+        for (i = 0; i < venc->ncodebooks; i++) {
+            av_freep(&venc->codebooks[i].lens);
+            av_freep(&venc->codebooks[i].codewords);
+            av_freep(&venc->codebooks[i].quantlist);
+            av_freep(&venc->codebooks[i].dimentions);
+            av_freep(&venc->codebooks[i].pow2);
+        }
+    av_freep(&venc->codebooks);
+
+    if (venc->floors)
+        for (i = 0; i < venc->nfloors; i++) {
+            int j;
+            if (venc->floors[i].classes)
+                for (j = 0; j < venc->floors[i].nclasses; j++)
+                    av_freep(&venc->floors[i].classes[j].books);
+            av_freep(&venc->floors[i].classes);
+            av_freep(&venc->floors[i].partition_to_class);
+            av_freep(&venc->floors[i].list);
+        }
+    av_freep(&venc->floors);
+
+    if (venc->residues)
+        for (i = 0; i < venc->nresidues; i++) {
+            av_freep(&venc->residues[i].books);
+            av_freep(&venc->residues[i].maxes);
+        }
+    av_freep(&venc->residues);
+
+    if (venc->mappings)
+        for (i = 0; i < venc->nmappings; i++) {
+            av_freep(&venc->mappings[i].mux);
+            av_freep(&venc->mappings[i].floor);
+            av_freep(&venc->mappings[i].residue);
+            av_freep(&venc->mappings[i].magnitude);
+            av_freep(&venc->mappings[i].angle);
+        }
+    av_freep(&venc->mappings);
+
+    av_freep(&venc->modes);
+
+    av_freep(&venc->saved);
+    av_freep(&venc->samples);
+    av_freep(&venc->floor);
+    av_freep(&venc->coeffs);
+
+    ff_mdct_end(&venc->mdct[0]);
+    ff_mdct_end(&venc->mdct[1]);
+
+    av_freep(&avccontext->coded_frame);
+    av_freep(&avccontext->extradata);
+
+    return 0 ;
+}
+
+AVCodec ff_vorbis_encoder = {
+    "vorbis",
+    AVMEDIA_TYPE_AUDIO,
+    CODEC_ID_VORBIS,
+    sizeof(vorbis_enc_context),
+    vorbis_encode_init,
+    vorbis_encode_frame,
+    vorbis_encode_close,
+    .capabilities= CODEC_CAP_DELAY | CODEC_CAP_EXPERIMENTAL,
+    .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
+    .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
+};