rename vorbis.c to vorbis_dec.c and vorbis_common.c to vorbis.c

Originally committed as revision 8981 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 1638 insertions, 0 deletions

diff --git a/libavcodec/vorbis_dec.c b/libavcodec/vorbis_dec.c
new file mode 100644
index 0000000000..e82833ddf6
--- /dev/null
+++ b/libavcodec/vorbis_dec.c
@@ -0,0 +1,1638 @@
+/**
+ * @file vorbis_dec.c
+ * Vorbis I decoder
+ * @author Denes Balatoni  ( dbalatoni programozo hu )
+
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ */
+
+#undef V_DEBUG
+//#define V_DEBUG
+//#define AV_DEBUG(...) av_log(NULL, AV_LOG_INFO, __VA_ARGS__)
+
+#include <math.h>
+
+#define ALT_BITSTREAM_READER_LE
+#include "avcodec.h"
+#include "bitstream.h"
+#include "dsputil.h"
+
+#include "vorbis.h"
+#include "xiph.h"
+
+#define V_NB_BITS 8
+#define V_NB_BITS2 11
+#define V_MAX_VLCS (1<<16)
+
+#ifndef V_DEBUG
+#define AV_DEBUG(...)
+#endif
+
+#undef NDEBUG
+#include <assert.h>
+
+typedef struct {
+    uint_fast8_t dimensions;
+    uint_fast8_t lookup_type;
+    uint_fast8_t maxdepth;
+    VLC vlc;
+    float *codevectors;
+    unsigned int nb_bits;
+} vorbis_codebook;
+
+typedef union vorbis_floor_u vorbis_floor_data;
+typedef struct vorbis_floor0_s vorbis_floor0;
+typedef struct vorbis_floor1_s vorbis_floor1;
+struct vorbis_context_s;
+typedef
+uint_fast8_t (* vorbis_floor_decode_func)
+             (struct vorbis_context_s *, vorbis_floor_data *, float *);
+typedef struct {
+    uint_fast8_t floor_type;
+    vorbis_floor_decode_func decode;
+    union vorbis_floor_u
+    {
+        struct vorbis_floor0_s
+        {
+            uint_fast8_t order;
+            uint_fast16_t rate;
+            uint_fast16_t bark_map_size;
+            int_fast32_t * map[2];
+            uint_fast32_t map_size[2];
+            uint_fast8_t amplitude_bits;
+            uint_fast8_t amplitude_offset;
+            uint_fast8_t num_books;
+            uint_fast8_t * book_list;
+            float * lsp;
+        } t0;
+        struct vorbis_floor1_s
+        {
+            uint_fast8_t partitions;
+            uint_fast8_t maximum_class;
+            uint_fast8_t partition_class[32];
+            uint_fast8_t class_dimensions[16];
+            uint_fast8_t class_subclasses[16];
+            uint_fast8_t class_masterbook[16];
+            int_fast16_t subclass_books[16][8];
+            uint_fast8_t multiplier;
+            uint_fast16_t x_list_dim;
+            floor1_entry_t * list;
+        } t1;
+    } data;
+} vorbis_floor;
+
+typedef struct {
+    uint_fast16_t type;
+    uint_fast32_t begin;
+    uint_fast32_t end;
+    uint_fast32_t partition_size;
+    uint_fast8_t classifications;
+    uint_fast8_t classbook;
+    int_fast16_t books[64][8];
+    uint_fast8_t maxpass;
+} vorbis_residue;
+
+typedef struct {
+    uint_fast8_t submaps;
+    uint_fast16_t coupling_steps;
+    uint_fast8_t *magnitude;
+    uint_fast8_t *angle;
+    uint_fast8_t *mux;
+    uint_fast8_t submap_floor[16];
+    uint_fast8_t submap_residue[16];
+} vorbis_mapping;
+
+typedef struct {
+    uint_fast8_t blockflag;
+    uint_fast16_t windowtype;
+    uint_fast16_t transformtype;
+    uint_fast8_t mapping;
+} vorbis_mode;
+
+typedef struct vorbis_context_s {
+    AVCodecContext *avccontext;
+    GetBitContext gb;
+    DSPContext dsp;
+
+    MDCTContext mdct[2];
+    uint_fast8_t first_frame;
+    uint_fast32_t version;
+    uint_fast8_t audio_channels;
+    uint_fast32_t audio_samplerate;
+    uint_fast32_t bitrate_maximum;
+    uint_fast32_t bitrate_nominal;
+    uint_fast32_t bitrate_minimum;
+    uint_fast32_t blocksize[2];
+    const float * win[2];
+    uint_fast16_t codebook_count;
+    vorbis_codebook *codebooks;
+    uint_fast8_t floor_count;
+    vorbis_floor *floors;
+    uint_fast8_t residue_count;
+    vorbis_residue *residues;
+    uint_fast8_t mapping_count;
+    vorbis_mapping *mappings;
+    uint_fast8_t mode_count;
+    vorbis_mode *modes;
+    uint_fast8_t mode_number; // mode number for the current packet
+    float *channel_residues;
+    float *channel_floors;
+    float *saved;
+    uint_fast16_t saved_start;
+    float *ret;
+    float *buf;
+    float *buf_tmp;
+    uint_fast32_t add_bias; // for float->int conversion
+    uint_fast32_t exp_bias;
+} vorbis_context;
+
+/* Helper functions */
+
+#define BARK(x) \
+    (13.1f*atan(0.00074f*(x))+2.24f*atan(1.85e-8f*(x)*(x))+1e-4f*(x))
+
+static float vorbisfloat2float(uint_fast32_t val) {
+    double mant=val&0x1fffff;
+    long exp=(val&0x7fe00000L)>>21;
+    if (val&0x80000000) mant=-mant;
+    return(ldexp(mant, exp-20-768));
+}
+
+
+// Free all allocated memory -----------------------------------------
+
+static void vorbis_free(vorbis_context *vc) {
+    int_fast16_t i;
+
+    av_freep(&vc->channel_residues);
+    av_freep(&vc->channel_floors);
+    av_freep(&vc->saved);
+    av_freep(&vc->ret);
+    av_freep(&vc->buf);
+    av_freep(&vc->buf_tmp);
+
+    av_freep(&vc->residues);
+    av_freep(&vc->modes);
+
+    ff_mdct_end(&vc->mdct[0]);
+    ff_mdct_end(&vc->mdct[1]);
+
+    for(i=0;i<vc->codebook_count;++i) {
+        av_free(vc->codebooks[i].codevectors);
+        free_vlc(&vc->codebooks[i].vlc);
+    }
+    av_freep(&vc->codebooks);
+
+    for(i=0;i<vc->floor_count;++i) {
+        if(vc->floors[i].floor_type==0) {
+            av_free(vc->floors[i].data.t0.map[0]);
+            av_free(vc->floors[i].data.t0.map[1]);
+            av_free(vc->floors[i].data.t0.book_list);
+            av_free(vc->floors[i].data.t0.lsp);
+        }
+        else {
+            av_free(vc->floors[i].data.t1.list);
+        }
+    }
+    av_freep(&vc->floors);
+
+    for(i=0;i<vc->mapping_count;++i) {
+        av_free(vc->mappings[i].magnitude);
+        av_free(vc->mappings[i].angle);
+        av_free(vc->mappings[i].mux);
+    }
+    av_freep(&vc->mappings);
+
+    if(vc->exp_bias){
+        av_freep(&vc->win[0]);
+        av_freep(&vc->win[1]);
+    }
+}
+
+// Parse setup header -------------------------------------------------
+
+// Process codebooks part
+
+static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {
+    uint_fast16_t cb;
+    uint8_t *tmp_vlc_bits;
+    uint32_t *tmp_vlc_codes;
+    GetBitContext *gb=&vc->gb;
+
+    vc->codebook_count=get_bits(gb,8)+1;
+
+    AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
+
+    vc->codebooks=(vorbis_codebook *)av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
+    tmp_vlc_bits=(uint8_t *)av_mallocz(V_MAX_VLCS * sizeof(uint8_t));
+    tmp_vlc_codes=(uint32_t *)av_mallocz(V_MAX_VLCS * sizeof(uint32_t));
+
+    for(cb=0;cb<vc->codebook_count;++cb) {
+        vorbis_codebook *codebook_setup=&vc->codebooks[cb];
+        uint_fast8_t ordered;
+        uint_fast32_t t, used_entries=0;
+        uint_fast32_t entries;
+
+        AV_DEBUG(" %d. Codebook \n", cb);
+
+        if (get_bits(gb, 24)!=0x564342) {
+            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook setup data corrupt. \n", cb);
+            goto error;
+        }
+
+        codebook_setup->dimensions=get_bits(gb, 16);
+        if (codebook_setup->dimensions>16) {
+            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is too large (%d). \n", cb, codebook_setup->dimensions);
+            goto error;
+        }
+        entries=get_bits(gb, 24);
+        if (entries>V_MAX_VLCS) {
+            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries);
+            goto error;
+        }
+
+        ordered=get_bits1(gb);
+
+        AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
+
+        if (!ordered) {
+            uint_fast16_t ce;
+            uint_fast8_t flag;
+            uint_fast8_t sparse=get_bits1(gb);
+
+            AV_DEBUG(" not ordered \n");
+
+            if (sparse) {
+                AV_DEBUG(" sparse \n");
+
+                used_entries=0;
+                for(ce=0;ce<entries;++ce) {
+                    flag=get_bits1(gb);
+                    if (flag) {
+                        tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
+                        ++used_entries;
+                    }
+                    else tmp_vlc_bits[ce]=0;
+                }
+            } else {
+                AV_DEBUG(" not sparse \n");
+
+                used_entries=entries;
+                for(ce=0;ce<entries;++ce) {
+                    tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
+                }
+            }
+        } else {
+            uint_fast16_t current_entry=0;
+            uint_fast8_t current_length=get_bits(gb, 5)+1;
+
+            AV_DEBUG(" ordered, current length: %d \n", current_length);  //FIXME
+
+            used_entries=entries;
+            for(;current_entry<used_entries;++current_length) {
+                uint_fast16_t i, number;
+
+                AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
+
+                number=get_bits(gb, ilog(entries - current_entry));
+
+                AV_DEBUG(" number: %d \n", number);
+
+                for(i=current_entry;i<number+current_entry;++i) {
+                    if (i<used_entries) tmp_vlc_bits[i]=current_length;
+                }
+
+                current_entry+=number;
+            }
+            if (current_entry>used_entries) {
+                av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
+                goto error;
+            }
+        }
+
+        codebook_setup->lookup_type=get_bits(gb, 4);
+
+        AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup" );
+
+// If the codebook is used for (inverse) VQ, calculate codevectors.
+
+        if (codebook_setup->lookup_type==1) {
+            uint_fast16_t i, j, k;
+            uint_fast16_t codebook_lookup_values=ff_vorbis_nth_root(entries, codebook_setup->dimensions);
+            uint_fast16_t codebook_multiplicands[codebook_lookup_values];
+
+            float codebook_minimum_value=vorbisfloat2float(get_bits_long(gb, 32));
+            float codebook_delta_value=vorbisfloat2float(get_bits_long(gb, 32));
+            uint_fast8_t codebook_value_bits=get_bits(gb, 4)+1;
+            uint_fast8_t codebook_sequence_p=get_bits1(gb);
+
+            AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
+            AV_DEBUG("  delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
+
+            for(i=0;i<codebook_lookup_values;++i) {
+                codebook_multiplicands[i]=get_bits(gb, codebook_value_bits);
+
+                AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
+                AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
+            }
+
+// Weed out unused vlcs and build codevector vector
+            codebook_setup->codevectors=(float *)av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float));
+            for(j=0, i=0;i<entries;++i) {
+                uint_fast8_t dim=codebook_setup->dimensions;
+
+                if (tmp_vlc_bits[i]) {
+                    float last=0.0;
+                    uint_fast32_t lookup_offset=i;
+
+#ifdef V_DEBUG
+                    av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
+#endif
+
+                    for(k=0;k<dim;++k) {
+                        uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
+                        codebook_setup->codevectors[j*dim+k]=codebook_multiplicands[multiplicand_offset]*codebook_delta_value+codebook_minimum_value+last;
+                        if (codebook_sequence_p) {
+                            last=codebook_setup->codevectors[j*dim+k];
+                        }
+                        lookup_offset/=codebook_lookup_values;
+                    }
+                    tmp_vlc_bits[j]=tmp_vlc_bits[i];
+
+#ifdef V_DEBUG
+                    av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
+                    for(k=0;k<dim;++k) {
+                        av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j*dim+k]);
+                    }
+                    av_log(vc->avccontext, AV_LOG_INFO, "\n");
+#endif
+
+                    ++j;
+                }
+            }
+            if (j!=used_entries) {
+                av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
+                goto error;
+            }
+            entries=used_entries;
+        }
+        else if (codebook_setup->lookup_type>=2) {
+            av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
+            goto error;
+        }
+
+// Initialize VLC table
+        if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
+            av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
+            goto error;
+        }
+        codebook_setup->maxdepth=0;
+        for(t=0;t<entries;++t)
+            if (tmp_vlc_bits[t]>=codebook_setup->maxdepth) codebook_setup->maxdepth=tmp_vlc_bits[t];
+
+        if(codebook_setup->maxdepth > 3*V_NB_BITS) codebook_setup->nb_bits=V_NB_BITS2;
+        else                                       codebook_setup->nb_bits=V_NB_BITS;
+
+        codebook_setup->maxdepth=(codebook_setup->maxdepth+codebook_setup->nb_bits-1)/codebook_setup->nb_bits;
+
+        if (init_vlc(&codebook_setup->vlc, codebook_setup->nb_bits, entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits), sizeof(*tmp_vlc_bits), tmp_vlc_codes, sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes), INIT_VLC_LE)) {
+            av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
+            goto error;
+        }
+    }
+
+    av_free(tmp_vlc_bits);
+    av_free(tmp_vlc_codes);
+    return 0;
+
+// Error:
+error:
+    av_free(tmp_vlc_bits);
+    av_free(tmp_vlc_codes);
+    return 1;
+}
+
+// Process time domain transforms part (unused in Vorbis I)
+
+static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {
+    GetBitContext *gb=&vc->gb;
+    uint_fast8_t i;
+    uint_fast8_t vorbis_time_count=get_bits(gb, 6)+1;
+
+    for(i=0;i<vorbis_time_count;++i) {
+        uint_fast16_t vorbis_tdtransform=get_bits(gb, 16);
+
+        AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
+
+        if (vorbis_tdtransform) {
+            av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
+            return 1;
+        }
+    }
+    return 0;
+}
+
+// Process floors part
+
+static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
+                                         vorbis_floor_data *vfu, float *vec);
+static void create_map( vorbis_context * vc, uint_fast8_t floor_number );
+static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,
+                                         vorbis_floor_data *vfu, float *vec);
+static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {
+    GetBitContext *gb=&vc->gb;
+    uint_fast16_t i,j,k;
+
+    vc->floor_count=get_bits(gb, 6)+1;
+
+    vc->floors=(vorbis_floor *)av_mallocz(vc->floor_count * sizeof(vorbis_floor));
+
+    for (i=0;i<vc->floor_count;++i) {
+        vorbis_floor *floor_setup=&vc->floors[i];
+
+        floor_setup->floor_type=get_bits(gb, 16);
+
+        AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
+
+        if (floor_setup->floor_type==1) {
+            uint_fast8_t maximum_class=0;
+            uint_fast8_t rangebits;
+            uint_fast16_t floor1_values=2;
+
+            floor_setup->decode=vorbis_floor1_decode;
+
+            floor_setup->data.t1.partitions=get_bits(gb, 5);
+
+            AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions);
+
+            for(j=0;j<floor_setup->data.t1.partitions;++j) {
+                floor_setup->data.t1.partition_class[j]=get_bits(gb, 4);
+                if (floor_setup->data.t1.partition_class[j]>maximum_class) maximum_class=floor_setup->data.t1.partition_class[j];
+
+                AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]);
+
+            }
+
+            AV_DEBUG(" maximum class %d \n", maximum_class);
+
+            floor_setup->data.t1.maximum_class=maximum_class;
+
+            for(j=0;j<=maximum_class;++j) {
+                floor_setup->data.t1.class_dimensions[j]=get_bits(gb, 3)+1;
+                floor_setup->data.t1.class_subclasses[j]=get_bits(gb, 2);
+
+                AV_DEBUG(" %d floor %d class dim: %d subclasses %d \n", i, j, floor_setup->data.t1.class_dimensions[j], floor_setup->data.t1.class_subclasses[j]);
+
+                if (floor_setup->data.t1.class_subclasses[j]) {
+                    floor_setup->data.t1.class_masterbook[j]=get_bits(gb, 8);
+
+                    AV_DEBUG("   masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
+                }
+
+                for(k=0;k<(1<<floor_setup->data.t1.class_subclasses[j]);++k) {
+                    floor_setup->data.t1.subclass_books[j][k]=(int16_t)get_bits(gb, 8)-1;
+
+                    AV_DEBUG("    book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
+                }
+            }
+
+            floor_setup->data.t1.multiplier=get_bits(gb, 2)+1;
+            floor_setup->data.t1.x_list_dim=2;
+
+            for(j=0;j<floor_setup->data.t1.partitions;++j) {
+                floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
+            }
+
+            floor_setup->data.t1.list=(floor1_entry_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(floor1_entry_t));
+
+
+            rangebits=get_bits(gb, 4);
+            floor_setup->data.t1.list[0].x = 0;
+            floor_setup->data.t1.list[1].x = (1<<rangebits);
+
+            for(j=0;j<floor_setup->data.t1.partitions;++j) {
+                for(k=0;k<floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];++k,++floor1_values) {
+                    floor_setup->data.t1.list[floor1_values].x=get_bits(gb, rangebits);
+
+                    AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->data.t1.list[floor1_values].x);
+                }
+            }
+
+// Precalculate order of x coordinates - needed for decode
+            ff_vorbis_ready_floor1_list(floor_setup->data.t1.list, floor_setup->data.t1.x_list_dim);
+        }
+        else if(floor_setup->floor_type==0) {
+            uint_fast8_t max_codebook_dim=0;
+
+            floor_setup->decode=vorbis_floor0_decode;
+
+            floor_setup->data.t0.order=get_bits(gb, 8);
+            floor_setup->data.t0.rate=get_bits(gb, 16);
+            floor_setup->data.t0.bark_map_size=get_bits(gb, 16);
+            floor_setup->data.t0.amplitude_bits=get_bits(gb, 6);
+            /* zero would result in a div by zero later *
+             * 2^0 - 1 == 0                             */
+            if (floor_setup->data.t0.amplitude_bits == 0) {
+              av_log(vc->avccontext, AV_LOG_ERROR,
+                     "Floor 0 amplitude bits is 0.\n");
+              return 1;
+            }
+            floor_setup->data.t0.amplitude_offset=get_bits(gb, 8);
+            floor_setup->data.t0.num_books=get_bits(gb, 4)+1;
+
+            /* allocate mem for booklist */
+            floor_setup->data.t0.book_list=
+                av_malloc(floor_setup->data.t0.num_books);
+            if(!floor_setup->data.t0.book_list) { return 1; }
+            /* read book indexes */
+            {
+                int idx;
+                uint_fast8_t book_idx;
+                for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {
+                    book_idx=get_bits(gb, 8);
+                    floor_setup->data.t0.book_list[idx]=book_idx;
+                    if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
+                        max_codebook_dim=vc->codebooks[book_idx].dimensions;
+
+                    if (floor_setup->data.t0.book_list[idx]>vc->codebook_count)
+                        return 1;
+                }
+            }
+
+            create_map( vc, i );
+
+            /* allocate mem for lsp coefficients */
+            {
+                /* codebook dim is for padding if codebook dim doesn't *
+                 * divide order+1 then we need to read more data       */
+                floor_setup->data.t0.lsp=
+                    av_malloc((floor_setup->data.t0.order+1 + max_codebook_dim)
+                              * sizeof(float));
+                if(!floor_setup->data.t0.lsp) { return 1; }
+            }
+
+#ifdef V_DEBUG /* debug output parsed headers */
+            AV_DEBUG("floor0 order: %u\n", floor_setup->data.t0.order);
+            AV_DEBUG("floor0 rate: %u\n", floor_setup->data.t0.rate);
+            AV_DEBUG("floor0 bark map size: %u\n",
+              floor_setup->data.t0.bark_map_size);
+            AV_DEBUG("floor0 amplitude bits: %u\n",
+              floor_setup->data.t0.amplitude_bits);
+            AV_DEBUG("floor0 amplitude offset: %u\n",
+              floor_setup->data.t0.amplitude_offset);
+            AV_DEBUG("floor0 number of books: %u\n",
+              floor_setup->data.t0.num_books);
+            AV_DEBUG("floor0 book list pointer: %p\n",
+              floor_setup->data.t0.book_list);
+            {
+              int idx;
+              for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {
+                AV_DEBUG( "  Book %d: %u\n",
+                  idx+1,
+                  floor_setup->data.t0.book_list[idx] );
+              }
+            }
+#endif
+        }
+        else {
+            av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
+            return 1;
+        }
+    }
+    return 0;
+}
+
+// Process residues part
+
+static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){
+    GetBitContext *gb=&vc->gb;
+    uint_fast8_t i, j, k;
+
+    vc->residue_count=get_bits(gb, 6)+1;
+    vc->residues=(vorbis_residue *)av_mallocz(vc->residue_count * sizeof(vorbis_residue));
+
+    AV_DEBUG(" There are %d residues. \n", vc->residue_count);
+
+    for(i=0;i<vc->residue_count;++i) {
+        vorbis_residue *res_setup=&vc->residues[i];
+        uint_fast8_t cascade[64];
+        uint_fast8_t high_bits;
+        uint_fast8_t low_bits;
+
+        res_setup->type=get_bits(gb, 16);
+
+        AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
+
+        res_setup->begin=get_bits(gb, 24);
+        res_setup->end=get_bits(gb, 24);
+        res_setup->partition_size=get_bits(gb, 24)+1;
+        res_setup->classifications=get_bits(gb, 6)+1;
+        res_setup->classbook=get_bits(gb, 8);
+
+        AV_DEBUG("    begin %d end %d part.size %d classif.s %d classbook %d \n", res_setup->begin, res_setup->end, res_setup->partition_size,
+          res_setup->classifications, res_setup->classbook);
+
+        for(j=0;j<res_setup->classifications;++j) {
+            high_bits=0;
+            low_bits=get_bits(gb, 3);
+            if (get_bits1(gb)) {
+                high_bits=get_bits(gb, 5);
+            }
+            cascade[j]=(high_bits<<3)+low_bits;
+
+            AV_DEBUG("     %d class casscade depth: %d \n", j, ilog(cascade[j]));
+        }
+
+        res_setup->maxpass=0;
+        for(j=0;j<res_setup->classifications;++j) {
+            for(k=0;k<8;++k) {
+                if (cascade[j]&(1<<k)) {
+                        res_setup->books[j][k]=get_bits(gb, 8);
+
+                    AV_DEBUG("     %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
+
+                    if (k>res_setup->maxpass) {
+                        res_setup->maxpass=k;
+                    }
+                } else {
+                    res_setup->books[j][k]=-1;
+                }
+            }
+        }
+    }
+    return 0;
+}
+
+// Process mappings part
+
+static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {
+    GetBitContext *gb=&vc->gb;
+    uint_fast8_t i, j;
+
+    vc->mapping_count=get_bits(gb, 6)+1;
+    vc->mappings=(vorbis_mapping *)av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
+
+    AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
+
+    for(i=0;i<vc->mapping_count;++i) {
+        vorbis_mapping *mapping_setup=&vc->mappings[i];
+
+        if (get_bits(gb, 16)) {
+            av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
+            return 1;
+        }
+        if (get_bits1(gb)) {
+            mapping_setup->submaps=get_bits(gb, 4)+1;
+        } else {
+            mapping_setup->submaps=1;
+        }
+
+        if (get_bits1(gb)) {
+            mapping_setup->coupling_steps=get_bits(gb, 8)+1;
+            mapping_setup->magnitude=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
+            mapping_setup->angle=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
+            for(j=0;j<mapping_setup->coupling_steps;++j) {
+                mapping_setup->magnitude[j]=get_bits(gb, ilog(vc->audio_channels-1));
+                mapping_setup->angle[j]=get_bits(gb, ilog(vc->audio_channels-1));
+                // FIXME: sanity checks
+            }
+        } else {
+            mapping_setup->coupling_steps=0;
+        }
+
+        AV_DEBUG("   %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
+
+        if(get_bits(gb, 2)) {
+            av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
+            return 1; // following spec.
+        }
+
+        if (mapping_setup->submaps>1) {
+            mapping_setup->mux=(uint_fast8_t *)av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
+            for(j=0;j<vc->audio_channels;++j) {
+                mapping_setup->mux[j]=get_bits(gb, 4);
+            }
+        }
+
+        for(j=0;j<mapping_setup->submaps;++j) {
+            get_bits(gb, 8); // FIXME check?
+            mapping_setup->submap_floor[j]=get_bits(gb, 8);
+            mapping_setup->submap_residue[j]=get_bits(gb, 8);
+
+            AV_DEBUG("   %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
+        }
+    }
+    return 0;
+}
+
+// Process modes part
+
+static void create_map( vorbis_context * vc, uint_fast8_t floor_number )
+{
+    vorbis_floor * floors=vc->floors;
+    vorbis_floor0 * vf;
+    int idx;
+    int_fast8_t blockflag;
+    int_fast32_t * map;
+    int_fast32_t n; //TODO: could theoretically be smaller?
+
+    for (blockflag=0;blockflag<2;++blockflag)
+    {
+    n=vc->blocksize[blockflag]/2;
+    floors[floor_number].data.t0.map[blockflag]=
+        av_malloc((n+1) * sizeof(int_fast32_t)); // n+sentinel
+
+    map=floors[floor_number].data.t0.map[blockflag];
+    vf=&floors[floor_number].data.t0;
+
+    for (idx=0; idx<n;++idx) {
+        map[idx]=floor( BARK((vf->rate*idx)/(2.0f*n)) *
+                              ((vf->bark_map_size)/
+                               BARK(vf->rate/2.0f )) );
+        if (vf->bark_map_size-1 < map[idx]) {
+            map[idx]=vf->bark_map_size-1;
+        }
+    }
+    map[n]=-1;
+    vf->map_size[blockflag]=n;
+    }
+
+#   ifdef V_DEBUG
+    for(idx=0;idx<=n;++idx) {
+        AV_DEBUG("floor0 map: map at pos %d is %d\n",
+                 idx, map[idx]);
+    }
+#   endif
+}
+
+static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {
+    GetBitContext *gb=&vc->gb;
+    uint_fast8_t i;
+
+    vc->mode_count=get_bits(gb, 6)+1;
+    vc->modes=(vorbis_mode *)av_mallocz(vc->mode_count * sizeof(vorbis_mode));
+
+    AV_DEBUG(" There are %d modes.\n", vc->mode_count);
+
+    for(i=0;i<vc->mode_count;++i) {
+        vorbis_mode *mode_setup=&vc->modes[i];
+
+        mode_setup->blockflag=get_bits(gb, 1);
+        mode_setup->windowtype=get_bits(gb, 16); //FIXME check
+        mode_setup->transformtype=get_bits(gb, 16); //FIXME check
+        mode_setup->mapping=get_bits(gb, 8); //FIXME check
+
+        AV_DEBUG(" %d mode: blockflag %d, windowtype %d, transformtype %d, mapping %d \n", i, mode_setup->blockflag, mode_setup->windowtype, mode_setup->transformtype, mode_setup->mapping);
+    }
+    return 0;
+}
+
+// Process the whole setup header using the functions above
+
+static int vorbis_parse_setup_hdr(vorbis_context *vc) {
+    GetBitContext *gb=&vc->gb;
+
+    if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
+    (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
+    (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
+        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
+        return 1;
+    }
+
+    if (vorbis_parse_setup_hdr_codebooks(vc)) {
+        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
+        return 2;
+    }
+    if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
+        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
+        return 3;
+    }
+    if (vorbis_parse_setup_hdr_floors(vc)) {
+        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
+        return 4;
+    }
+    if (vorbis_parse_setup_hdr_residues(vc)) {
+        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
+        return 5;
+    }
+    if (vorbis_parse_setup_hdr_mappings(vc)) {
+        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
+        return 6;
+    }
+    if (vorbis_parse_setup_hdr_modes(vc)) {
+        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
+        return 7;
+    }
+    if (!get_bits1(gb)) {
+        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
+        return 8; // framing flag bit unset error
+    }
+
+    return 0;
+}
+
+// Process the identification header
+
+static int vorbis_parse_id_hdr(vorbis_context *vc){
+    GetBitContext *gb=&vc->gb;
+    uint_fast8_t bl0, bl1;
+
+    if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
+    (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
+    (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
+        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
+        return 1;
+    }
+
+    vc->version=get_bits_long(gb, 32);    //FIXME check 0
+    vc->audio_channels=get_bits(gb, 8);   //FIXME check >0
+    vc->audio_samplerate=get_bits_long(gb, 32);   //FIXME check >0
+    vc->bitrate_maximum=get_bits_long(gb, 32);
+    vc->bitrate_nominal=get_bits_long(gb, 32);
+    vc->bitrate_minimum=get_bits_long(gb, 32);
+    bl0=get_bits(gb, 4);
+    bl1=get_bits(gb, 4);
+    vc->blocksize[0]=(1<<bl0);
+    vc->blocksize[1]=(1<<bl1);
+    if (bl0>13 || bl0<6 || bl1>13 || bl1<6 || bl1<bl0) {
+        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
+        return 3;
+    }
+    // output format int16
+    if (vc->blocksize[1]/2 * vc->audio_channels * 2 >
+                                             AVCODEC_MAX_AUDIO_FRAME_SIZE) {
+        av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis channel count makes "
+               "output packets too large.\n");
+        return 4;
+    }
+    vc->win[0]=ff_vorbis_vwin[bl0-6];
+    vc->win[1]=ff_vorbis_vwin[bl1-6];
+
+    if(vc->exp_bias){
+        int i, j;
+        for(j=0; j<2; j++){
+            float *win = av_malloc(vc->blocksize[j]/2 * sizeof(float));
+            for(i=0; i<vc->blocksize[j]/2; i++)
+                win[i] = vc->win[j][i] * (1<<15);
+            vc->win[j] = win;
+        }
+    }
+
+    if ((get_bits1(gb)) == 0) {
+        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
+        return 2;
+    }
+
+    vc->channel_residues=(float *)av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));
+    vc->channel_floors=(float *)av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));
+    vc->saved=(float *)av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));
+    vc->ret=(float *)av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));
+    vc->buf=(float *)av_malloc(vc->blocksize[1] * sizeof(float));
+    vc->buf_tmp=(float *)av_malloc(vc->blocksize[1] * sizeof(float));
+    vc->saved_start=0;
+
+    ff_mdct_init(&vc->mdct[0], bl0, 1);
+    ff_mdct_init(&vc->mdct[1], bl1, 1);
+
+    AV_DEBUG(" vorbis version %d \n audio_channels %d \n audio_samplerate %d \n bitrate_max %d \n bitrate_nom %d \n bitrate_min %d \n blk_0 %d blk_1 %d \n ",
+            vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
+
+/*
+    BLK=vc->blocksize[0];
+    for(i=0;i<BLK/2;++i) {
+        vc->win[0][i]=sin(0.5*3.14159265358*(sin(((float)i+0.5)/(float)BLK*3.14159265358))*(sin(((float)i+0.5)/(float)BLK*3.14159265358)));
+    }
+*/
+
+    return 0;
+}
+
+// Process the extradata using the functions above (identification header, setup header)
+
+static int vorbis_decode_init(AVCodecContext *avccontext) {
+    vorbis_context *vc = avccontext->priv_data ;
+    uint8_t *headers = avccontext->extradata;
+    int headers_len=avccontext->extradata_size;
+    uint8_t *header_start[3];
+    int header_len[3];
+    GetBitContext *gb = &(vc->gb);
+    int hdr_type;
+
+    vc->avccontext = avccontext;
+    dsputil_init(&vc->dsp, avccontext);
+
+    if(vc->dsp.float_to_int16 == ff_float_to_int16_c) {
+        vc->add_bias = 385;
+        vc->exp_bias = 0;
+    } else {
+        vc->add_bias = 0;
+        vc->exp_bias = 15<<23;
+    }
+
+    if (!headers_len) {
+        av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
+        return -1;
+    }
+
+    if (ff_split_xiph_headers(headers, headers_len, 30, header_start, header_len) < 0) {
+        av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
+        return -1;
+    }
+
+    init_get_bits(gb, header_start[0], header_len[0]*8);
+    hdr_type=get_bits(gb, 8);
+    if (hdr_type!=1) {
+        av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
+        return -1;
+    }
+    if (vorbis_parse_id_hdr(vc)) {
+        av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
+        vorbis_free(vc);
+        return -1;
+    }
+
+    init_get_bits(gb, header_start[2], header_len[2]*8);
+    hdr_type=get_bits(gb, 8);
+    if (hdr_type!=5) {
+        av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
+        return -1;
+    }
+    if (vorbis_parse_setup_hdr(vc)) {
+        av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
+        vorbis_free(vc);
+        return -1;
+    }
+
+    avccontext->channels = vc->audio_channels;
+    avccontext->sample_rate = vc->audio_samplerate;
+
+    return 0 ;
+}
+
+// Decode audiopackets -------------------------------------------------
+
+// Read and decode floor
+
+static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
+                                         vorbis_floor_data *vfu, float *vec) {
+    vorbis_floor0 * vf=&vfu->t0;
+    float * lsp=vf->lsp;
+    uint_fast32_t amplitude;
+    uint_fast32_t book_idx;
+    uint_fast8_t blockflag=vc->modes[vc->mode_number].blockflag;
+
+    amplitude=get_bits(&vc->gb, vf->amplitude_bits);
+    if (amplitude>0) {
+        float last = 0;
+        uint_fast16_t lsp_len = 0;
+        uint_fast16_t idx;
+        vorbis_codebook codebook;
+
+        book_idx=get_bits(&vc->gb, ilog(vf->num_books));
+        if ( book_idx >= vf->num_books ) {
+            av_log( vc->avccontext, AV_LOG_ERROR,
+                    "floor0 dec: booknumber too high!\n" );
+            //FIXME: look above
+        }
+        AV_DEBUG( "floor0 dec: booknumber: %u\n", book_idx );
+        codebook=vc->codebooks[vf->book_list[book_idx]];
+
+        while (lsp_len<vf->order) {
+            int vec_off;
+
+            AV_DEBUG( "floor0 dec: book dimension: %d\n", codebook.dimensions );
+            AV_DEBUG( "floor0 dec: maximum depth: %d\n", codebook.maxdepth );
+            /* read temp vector */
+            vec_off=get_vlc2(&vc->gb,
+                             codebook.vlc.table,
+                             codebook.nb_bits,
+                             codebook.maxdepth ) *
+                             codebook.dimensions;
+            AV_DEBUG( "floor0 dec: vector offset: %d\n", vec_off );
+            /* copy each vector component and add last to it */
+            for (idx=0; idx<codebook.dimensions; ++idx) {
+                lsp[lsp_len+idx]=codebook.codevectors[vec_off+idx]+last;
+            }
+            last=lsp[lsp_len+idx-1]; /* set last to last vector component */
+
+            lsp_len += codebook.dimensions;
+        }
+#ifdef V_DEBUG
+        /* DEBUG: output lsp coeffs */
+        {
+            int idx;
+            for ( idx = 0; idx < lsp_len; ++idx )
+                AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx] );
+        }
+#endif
+
+        /* synthesize floor output vector */
+        {
+            int i;
+            int order=vf->order;
+            float wstep=M_PI/vf->bark_map_size;
+
+            for(i=0;i<order;i++) { lsp[i]=2.0f*cos(lsp[i]); }
+
+            AV_DEBUG("floor0 synth: map_size=%d; m=%d; wstep=%f\n",
+                     vf->map_size, order, wstep);
+
+            i=0;
+            while(i<vf->map_size[blockflag]) {
+                int j, iter_cond=vf->map[blockflag][i];
+                float p=0.5f;
+                float q=0.5f;
+                float two_cos_w=2.0f*cos(wstep*iter_cond); // needed all times
+
+                /* similar part for the q and p products */
+                for(j=0;j<order;j+=2) {
+                    q *= lsp[j]  -two_cos_w;
+                    p *= lsp[j+1]-two_cos_w;
+                }
+                if(j==order) { // even order
+                    p *= p*(2.0f-two_cos_w);
+                    q *= q*(2.0f+two_cos_w);
+                }
+                else { // odd order
+                    q *= two_cos_w-lsp[j]; // one more time for q
+
+                    /* final step and square */
+                    p *= p*(4.f-two_cos_w*two_cos_w);
+                    q *= q;
+                }
+
+                /* calculate linear floor value */
+                {
+                    q=exp( (
+                             ( (amplitude*vf->amplitude_offset)/
+                               (((1<<vf->amplitude_bits)-1) * sqrt(p+q)) )
+                             - vf->amplitude_offset ) * .11512925f
+                         );
+                }
+
+                /* fill vector */
+                do { vec[i]=q; ++i; }while(vf->map[blockflag][i]==iter_cond);
+            }
+        }
+    }
+    else {
+        /* this channel is unused */
+        return 1;
+    }
+
+    AV_DEBUG(" Floor0 decoded\n");
+
+    return 0;
+}
+
+static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor_data *vfu, float *vec) {
+    vorbis_floor1 * vf=&vfu->t1;
+    GetBitContext *gb=&vc->gb;
+    uint_fast16_t range_v[4]={ 256, 128, 86, 64 };
+    uint_fast16_t range=range_v[vf->multiplier-1];
+    uint_fast16_t floor1_Y[vf->x_list_dim];
+    uint_fast16_t floor1_Y_final[vf->x_list_dim];
+    int floor1_flag[vf->x_list_dim];
+    uint_fast8_t class_;
+    uint_fast8_t cdim;
+    uint_fast8_t cbits;
+    uint_fast8_t csub;
+    uint_fast8_t cval;
+    int_fast16_t book;
+    uint_fast16_t offset;
+    uint_fast16_t i,j;
+    /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?
+    int_fast16_t dy, err;
+
+
+    if (!get_bits1(gb)) return 1; // silence
+
+// Read values (or differences) for the floor's points
+
+    floor1_Y[0]=get_bits(gb, ilog(range-1));
+    floor1_Y[1]=get_bits(gb, ilog(range-1));
+
+    AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
+
+    offset=2;
+    for(i=0;i<vf->partitions;++i) {
+        class_=vf->partition_class[i];
+        cdim=vf->class_dimensions[class_];
+        cbits=vf->class_subclasses[class_];
+        csub=(1<<cbits)-1;
+        cval=0;
+
+        AV_DEBUG("Cbits %d \n", cbits);
+
+        if (cbits) { // this reads all subclasses for this partition's class
+            cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
+            vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);
+        }
+
+        for(j=0;j<cdim;++j) {
+            book=vf->subclass_books[class_][cval & csub];
+
+            AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));
+
+            cval=cval>>cbits;
+            if (book>-1) {
+                floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,
+                vc->codebooks[book].nb_bits, 3);
+            } else {
+                floor1_Y[offset+j]=0;
+            }
+
+            AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);
+        }
+        offset+=cdim;
+    }
+
+// Amplitude calculation from the differences
+
+    floor1_flag[0]=1;
+    floor1_flag[1]=1;
+    floor1_Y_final[0]=floor1_Y[0];
+    floor1_Y_final[1]=floor1_Y[1];
+
+    for(i=2;i<vf->x_list_dim;++i) {
+        uint_fast16_t val, highroom, lowroom, room;
+        uint_fast16_t high_neigh_offs;
+        uint_fast16_t low_neigh_offs;
+
+        low_neigh_offs=vf->list[i].low;
+        high_neigh_offs=vf->list[i].high;
+        dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs];  // render_point begin
+        adx=vf->list[high_neigh_offs].x-vf->list[low_neigh_offs].x;
+        ady= FFABS(dy);
+        err=ady*(vf->list[i].x-vf->list[low_neigh_offs].x);
+        off=(int16_t)err/(int16_t)adx;
+        if (dy<0) {
+            predicted=floor1_Y_final[low_neigh_offs]-off;
+        } else {
+            predicted=floor1_Y_final[low_neigh_offs]+off;
+        } // render_point end
+
+        val=floor1_Y[i];
+        highroom=range-predicted;
+        lowroom=predicted;
+        if (highroom < lowroom) {
+            room=highroom*2;
+        } else {
+            room=lowroom*2;   // SPEC mispelling
+        }
+        if (val) {
+            floor1_flag[low_neigh_offs]=1;
+            floor1_flag[high_neigh_offs]=1;
+            floor1_flag[i]=1;
+            if (val>=room) {
+                if (highroom > lowroom) {
+                    floor1_Y_final[i]=val-lowroom+predicted;
+                } else {
+                    floor1_Y_final[i]=predicted-val+highroom-1;
+                }
+            } else {
+                if (val & 1) {
+                    floor1_Y_final[i]=predicted-(val+1)/2;
+                } else {
+                    floor1_Y_final[i]=predicted+val/2;
+                }
+            }
+        } else {
+            floor1_flag[i]=0;
+            floor1_Y_final[i]=predicted;
+        }
+
+        AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);
+    }
+
+// Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
+
+    ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
+
+    AV_DEBUG(" Floor decoded\n");
+
+    return 0;
+}
+
+// Read and decode residue
+
+static int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr, uint_fast8_t ch, uint_fast8_t *do_not_decode, float *vec, uint_fast16_t vlen) {
+    GetBitContext *gb=&vc->gb;
+    uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;
+    uint_fast16_t n_to_read=vr->end-vr->begin;
+    uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;
+    uint_fast8_t classifs[ptns_to_read*vc->audio_channels];
+    uint_fast8_t pass;
+    uint_fast8_t ch_used;
+    uint_fast8_t i,j,l;
+    uint_fast16_t k;
+
+    if (vr->type==2) {
+        for(j=1;j<ch;++j) {
+                do_not_decode[0]&=do_not_decode[j];  // FIXME - clobbering input
+        }
+        if (do_not_decode[0]) return 0;
+        ch_used=1;
+    } else {
+        ch_used=ch;
+    }
+
+    AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);
+
+    for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?
+        uint_fast16_t voffset;
+        uint_fast16_t partition_count;
+        uint_fast16_t j_times_ptns_to_read;
+
+        voffset=vr->begin;
+        for(partition_count=0;partition_count<ptns_to_read;) {  // SPEC        error
+            if (!pass) {
+                uint_fast32_t inverse_class = ff_inverse[vr->classifications];
+                for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
+                    if (!do_not_decode[j]) {
+                        uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
+                        vc->codebooks[vr->classbook].nb_bits, 3);
+
+                        AV_DEBUG("Classword: %d \n", temp);
+
+                        assert(vr->classifications > 1 && temp<=65536); //needed for inverse[]
+                        for(i=0;i<c_p_c;++i) {
+                            uint_fast32_t temp2;
+
+                            temp2=(((uint_fast64_t)temp) * inverse_class)>>32;
+                            if (partition_count+c_p_c-1-i < ptns_to_read) {
+                                classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;
+                            }
+                            temp=temp2;
+                        }
+                    }
+                    j_times_ptns_to_read+=ptns_to_read;
+                }
+            }
+            for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {
+                for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
+                    uint_fast16_t voffs;
+
+                    if (!do_not_decode[j]) {
+                        uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];
+                        int_fast16_t vqbook=vr->books[vqclass][pass];
+
+                        if (vqbook>=0) {
+                            uint_fast16_t coffs;
+                            unsigned dim= vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64
+                            uint_fast16_t step= dim==1 ? vr->partition_size
+                                              : FASTDIV(vr->partition_size, dim);
+                            vorbis_codebook codebook= vc->codebooks[vqbook];
+
+                            if (vr->type==0) {
+
+                                voffs=voffset+j*vlen;
+                                for(k=0;k<step;++k) {
+                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
+                                    for(l=0;l<dim;++l) {
+                                        vec[voffs+k+l*step]+=codebook.codevectors[coffs+l];  // FPMATH
+                                    }
+                                }
+                            }
+                            else if (vr->type==1) {
+                                voffs=voffset+j*vlen;
+                                for(k=0;k<step;++k) {
+                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
+                                    for(l=0;l<dim;++l, ++voffs) {
+                                        vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH
+
+                                        AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
+                                    }
+                                }
+                            }
+                            else if (vr->type==2 && ch==2 && (voffset&1)==0 && (dim&1)==0) { // most frequent case optimized
+                                voffs=voffset>>1;
+
+                                if(dim==2) {
+                                    for(k=0;k<step;++k) {
+                                        coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
+                                        vec[voffs+k     ]+=codebook.codevectors[coffs  ];  // FPMATH
+                                        vec[voffs+k+vlen]+=codebook.codevectors[coffs+1];  // FPMATH
+                                    }
+                                } else
+                                for(k=0;k<step;++k) {
+                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
+                                    for(l=0;l<dim;l+=2, voffs++) {
+                                        vec[voffs     ]+=codebook.codevectors[coffs+l  ];  // FPMATH
+                                        vec[voffs+vlen]+=codebook.codevectors[coffs+l+1];  // FPMATH
+
+                                        AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n", pass, voffset/ch+(voffs%ch)*vlen, vec[voffset/ch+(voffs%ch)*vlen], codebook.codevectors[coffs+l], coffs, l);
+                                    }
+                                }
+
+                            }
+                            else if (vr->type==2) {
+                                voffs=voffset;
+
+                                for(k=0;k<step;++k) {
+                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
+                                    for(l=0;l<dim;++l, ++voffs) {
+                                        vec[voffs/ch+(voffs%ch)*vlen]+=codebook.codevectors[coffs+l];  // FPMATH FIXME use if and counter instead of / and %
+
+                                        AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n", pass, voffset/ch+(voffs%ch)*vlen, vec[voffset/ch+(voffs%ch)*vlen], codebook.codevectors[coffs+l], coffs, l);
+                                    }
+                                }
+                            } else {
+                                av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
+                                return 1;
+                            }
+                        }
+                    }
+                    j_times_ptns_to_read+=ptns_to_read;
+                }
+                ++partition_count;
+                voffset+=vr->partition_size;
+            }
+        }
+    }
+    return 0;
+}
+
+void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)
+{
+    int i;
+    for(i=0; i<blocksize; i++)
+    {
+        if (mag[i]>0.0) {
+            if (ang[i]>0.0) {
+                ang[i]=mag[i]-ang[i];
+            } else {
+                float temp=ang[i];
+                ang[i]=mag[i];
+                mag[i]+=temp;
+            }
+        } else {
+            if (ang[i]>0.0) {
+                ang[i]+=mag[i];
+            } else {
+                float temp=ang[i];
+                ang[i]=mag[i];
+                mag[i]-=temp;
+            }
+        }
+    }
+}
+
+// Decode the audio packet using the functions above
+
+static int vorbis_parse_audio_packet(vorbis_context *vc) {
+    GetBitContext *gb=&vc->gb;
+
+    uint_fast8_t previous_window=0,next_window=0;
+    uint_fast8_t mode_number;
+    uint_fast16_t blocksize;
+    int_fast32_t i,j;
+    uint_fast8_t no_residue[vc->audio_channels];
+    uint_fast8_t do_not_decode[vc->audio_channels];
+    vorbis_mapping *mapping;
+    float *ch_res_ptr=vc->channel_residues;
+    float *ch_floor_ptr=vc->channel_floors;
+    uint_fast8_t res_chan[vc->audio_channels];
+    uint_fast8_t res_num=0;
+    int_fast16_t retlen=0;
+    uint_fast16_t saved_start=0;
+    float fadd_bias = vc->add_bias;
+
+    if (get_bits1(gb)) {
+        av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
+        return -1; // packet type not audio
+    }
+
+    if (vc->mode_count==1) {
+        mode_number=0;
+    } else {
+        mode_number=get_bits(gb, ilog(vc->mode_count-1));
+    }
+    vc->mode_number=mode_number;
+    mapping=&vc->mappings[vc->modes[mode_number].mapping];
+
+    AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
+
+    if (vc->modes[mode_number].blockflag) {
+        previous_window=get_bits1(gb);
+        next_window=get_bits1(gb);
+    }
+
+    blocksize=vc->blocksize[vc->modes[mode_number].blockflag];
+    memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
+    memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
+
+// Decode floor
+
+    for(i=0;i<vc->audio_channels;++i) {
+        vorbis_floor *floor;
+        if (mapping->submaps>1) {
+            floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];
+        } else {
+            floor=&vc->floors[mapping->submap_floor[0]];
+        }
+
+        no_residue[i]=floor->decode(vc, &floor->data, ch_floor_ptr);
+        ch_floor_ptr+=blocksize/2;
+    }
+
+// Nonzero vector propagate
+
+    for(i=mapping->coupling_steps-1;i>=0;--i) {
+        if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
+            no_residue[mapping->magnitude[i]]=0;
+            no_residue[mapping->angle[i]]=0;
+        }
+    }
+
+// Decode residue
+
+    for(i=0;i<mapping->submaps;++i) {
+        vorbis_residue *residue;
+        uint_fast8_t ch=0;
+
+        for(j=0;j<vc->audio_channels;++j) {
+            if ((mapping->submaps==1) || (i=mapping->mux[j])) {
+                res_chan[j]=res_num;
+                if (no_residue[j]) {
+                    do_not_decode[ch]=1;
+                } else {
+                    do_not_decode[ch]=0;
+                }
+                ++ch;
+                ++res_num;
+            }
+        }
+        residue=&vc->residues[mapping->submap_residue[i]];
+        vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
+
+        ch_res_ptr+=ch*blocksize/2;
+    }
+
+// Inverse coupling
+
+    for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed
+        float *mag, *ang;
+
+        mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;
+        ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;
+        vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize/2);
+    }
+
+// Dotproduct
+
+    for(j=0, ch_floor_ptr=vc->channel_floors;j<vc->audio_channels;++j,ch_floor_ptr+=blocksize/2) {
+        ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;
+        vc->dsp.vector_fmul(ch_floor_ptr, ch_res_ptr, blocksize/2);
+    }
+
+// MDCT, overlap/add, save data for next overlapping  FPMATH
+
+    for(j=0;j<vc->audio_channels;++j) {
+        uint_fast8_t step=vc->audio_channels;
+        uint_fast16_t k;
+        float *saved=vc->saved+j*vc->blocksize[1]/2;
+        float *ret=vc->ret;
+        const float *lwin=vc->win[1];
+        const float *swin=vc->win[0];
+        float *buf=vc->buf;
+        float *buf_tmp=vc->buf_tmp;
+
+        ch_floor_ptr=vc->channel_floors+j*blocksize/2;
+
+        saved_start=vc->saved_start;
+
+        vc->mdct[0].fft.imdct_calc(&vc->mdct[vc->modes[mode_number].blockflag], buf, ch_floor_ptr, buf_tmp);
+
+        //FIXME process channels together, to allow faster simd vector_fmul_add_add?
+        if (vc->modes[mode_number].blockflag) {
+            // -- overlap/add
+            if (previous_window) {
+                vc->dsp.vector_fmul_add_add(ret+j, buf, lwin, saved, vc->add_bias, vc->blocksize[1]/2, step);
+                retlen=vc->blocksize[1]/2;
+            } else {
+                int len = (vc->blocksize[1]-vc->blocksize[0])/4;
+                buf += len;
+                vc->dsp.vector_fmul_add_add(ret+j, buf, swin, saved, vc->add_bias, vc->blocksize[0]/2, step);
+                k = vc->blocksize[0]/2*step + j;
+                buf += vc->blocksize[0]/2;
+                if(vc->exp_bias){
+                    for(i=0; i<len; i++, k+=step)
+                        ((uint32_t*)ret)[k] = ((uint32_t*)buf)[i] + vc->exp_bias; // ret[k]=buf[i]*(1<<bias)
+                } else {
+                    for(i=0; i<len; i++, k+=step)
+                        ret[k] = buf[i] + fadd_bias;
+                }
+                buf=vc->buf;
+                retlen=vc->blocksize[0]/2+len;
+            }
+            // -- save
+            if (next_window) {
+                buf += vc->blocksize[1]/2;
+                vc->dsp.vector_fmul_reverse(saved, buf, lwin, vc->blocksize[1]/2);
+                saved_start=0;
+            } else {
+                saved_start=(vc->blocksize[1]-vc->blocksize[0])/4;
+                buf += vc->blocksize[1]/2;
+                for(i=0; i<saved_start; i++)
+                    ((uint32_t*)saved)[i] = ((uint32_t*)buf)[i] + vc->exp_bias;
+                vc->dsp.vector_fmul_reverse(saved+saved_start, buf+saved_start, swin, vc->blocksize[0]/2);
+            }
+        } else {
+            // --overlap/add
+            if(vc->add_bias) {
+                for(k=j, i=0;i<saved_start;++i, k+=step)
+                    ret[k] = saved[i] + fadd_bias;
+            } else {
+                for(k=j, i=0;i<saved_start;++i, k+=step)
+                    ret[k] = saved[i];
+            }
+            vc->dsp.vector_fmul_add_add(ret+k, buf, swin, saved+saved_start, vc->add_bias, vc->blocksize[0]/2, step);
+            retlen=saved_start+vc->blocksize[0]/2;
+            // -- save
+            buf += vc->blocksize[0]/2;
+            vc->dsp.vector_fmul_reverse(saved, buf, swin, vc->blocksize[0]/2);
+            saved_start=0;
+        }
+    }
+    vc->saved_start=saved_start;
+
+    return retlen*vc->audio_channels;
+}
+
+// Return the decoded audio packet through the standard api
+
+static int vorbis_decode_frame(AVCodecContext *avccontext,
+                        void *data, int *data_size,
+                        uint8_t *buf, int buf_size)
+{
+    vorbis_context *vc = avccontext->priv_data ;
+    GetBitContext *gb = &(vc->gb);
+
+    int_fast16_t len;
+
+    if(!buf_size){
+        return 0;
+    }
+
+    AV_DEBUG("packet length %d \n", buf_size);
+
+    init_get_bits(gb, buf, buf_size*8);
+
+    len=vorbis_parse_audio_packet(vc);
+
+    if (len<=0) {
+        *data_size=0;
+        return buf_size;
+    }
+
+    if (!vc->first_frame) {
+        vc->first_frame=1;
+        *data_size=0;
+        return buf_size ;
+    }
+
+    AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
+
+    vc->dsp.float_to_int16(data, vc->ret, len);
+    *data_size=len*2;
+
+    return buf_size ;
+}
+
+// Close decoder
+
+static int vorbis_decode_close(AVCodecContext *avccontext) {
+    vorbis_context *vc = avccontext->priv_data;
+
+    vorbis_free(vc);
+
+    return 0 ;
+}
+
+AVCodec vorbis_decoder = {
+    "vorbis",
+    CODEC_TYPE_AUDIO,
+    CODEC_ID_VORBIS,
+    sizeof(vorbis_context),
+    vorbis_decode_init,
+    NULL,
+    vorbis_decode_close,
+    vorbis_decode_frame,
+};
+