Cook compatibe decoder, patch by Benjamin Larsson

Add cook demucing, change rm demuxer so that it reorders audio packets
before sending them to the decoder, and send minimum decodeable sized
packets; pass only real codec extradata fo the decoder
Fix 28_8 decoder for the new demuxer strategy

Originally committed as revision 4726 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 1286 insertions, 0 deletions

diff --git a/libavcodec/cook.c b/libavcodec/cook.c
new file mode 100644
index 0000000000..d479660efb
--- /dev/null
+++ b/libavcodec/cook.c
@@ -0,0 +1,1286 @@
+/*
+ * COOK compatible decoder
+ * Copyright (c) 2003 Sascha Sommer
+ * Copyright (c) 2005 Benjamin Larsson
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+/**
+ * @file cook.c
+ * Cook compatible decoder.
+ * This decoder handles RealNetworks, RealAudio G2 data.
+ * Cook is identified by the codec name cook in RM files.
+ *
+ * To use this decoder, a calling application must supply the extradata
+ * bytes provided from the RM container; 8+ bytes for mono streams and
+ * 16+ for stereo streams (maybe more).
+ *
+ * Codec technicalities (all this assume a buffer length of 1024):
+ * Cook works with several different techniques to achieve its compression.
+ * In the timedomain the buffer is divided into 8 pieces and quantized. If
+ * two neighboring pieces have different quantization index a smooth
+ * quantization curve is used to get a smooth overlap between the different
+ * pieces.
+ * To get to the transformdomain Cook uses a modulated lapped transform.
+ * The transform domain has 50 subbands with 20 elements each. This
+ * means only a maximum of 50*20=1000 coefficients are used out of the 1024
+ * available.
+ */
+
+#include <math.h>
+#include <stddef.h>
+#include <stdio.h>
+
+#define ALT_BITSTREAM_READER
+#include "avcodec.h"
+#include "bitstream.h"
+#include "dsputil.h"
+
+#include "cookdata.h"
+
+/* the different Cook versions */
+#define MONO_COOK1      0x1000001
+#define MONO_COOK2      0x1000002
+#define JOINT_STEREO    0x1000003
+#define MC_COOK         0x2000000   //multichannel Cook, not supported
+
+#define SUBBAND_SIZE    20
+//#define COOKDEBUG
+
+typedef struct {
+    int     size;
+    int     qidx_table1[8];
+    int     qidx_table2[8];
+} COOKgain;
+
+typedef struct __attribute__((__packed__)){
+    /* codec data start */
+    uint32_t cookversion;               //in network order, bigendian
+    uint16_t samples_per_frame;         //amount of samples per frame per channel, bigendian
+    uint16_t subbands;                  //amount of bands used in the frequency domain, bigendian
+    /* Mono extradata ends here. */
+    uint32_t unused;
+    uint16_t js_subband_start;          //bigendian
+    uint16_t js_vlc_bits;               //bigendian
+    /* Stereo extradata ends here. */
+} COOKextradata;
+
+
+typedef struct {
+    GetBitContext       gb;
+    /* stream data */
+    int                 nb_channels;
+    int                 joint_stereo;
+    int                 bit_rate;
+    int                 sample_rate;
+    int                 samples_per_channel;
+    int                 samples_per_frame;
+    int                 subbands;
+    int                 numvector_bits;
+    int                 numvector_size;                //1 << numvector_bits;
+    int                 js_subband_start;
+    int                 total_subbands;
+    int                 num_vectors;
+    int                 bits_per_subpacket;
+    /* states */
+    int                 random_state;
+
+    /* transform data */
+    FFTContext          fft_ctx;
+    FFTSample           mlt_tmp[1024] __attribute__((aligned(16))); /* temporary storage for imlt */
+    float*              mlt_window;
+    float*              mlt_precos;
+    float*              mlt_presin;
+    float*              mlt_postcos;
+    int                 fft_size;
+    int                 fft_order;
+    int                 mlt_size;       //modulated lapped transform size
+
+    /* gain buffers */
+    COOKgain*           gain_now_ptr;
+    COOKgain*           gain_previous_ptr;
+    COOKgain            gain_copy;
+    COOKgain            gain_current;
+    COOKgain            gain_now;
+    COOKgain            gain_previous;
+
+    /* VLC data */
+    int                 js_vlc_bits;
+    VLC                 envelope_quant_index[13];
+    VLC                 sqvh[7];          //scalar quantization
+    VLC                 ccpl;             //channel coupling
+
+    /* generatable tables and related variables */
+    int                 gain_size_factor;
+    float               gain_table[23];
+    float               pow2tab[127];
+    float               rootpow2tab[127];
+
+    /* data buffers */
+    uint8_t*            frame_reorder_buffer;
+    int*                frame_reorder_index;
+    int                 frame_reorder_counter;
+    int                 frame_reorder_complete;
+    int                 frame_reorder_index_size;
+
+    uint8_t*            decoded_bytes_buffer;
+    float               mono_mdct_output[2048] __attribute__((aligned(16)));
+    float*              previous_buffer_ptr[2];
+    float               mono_previous_buffer1[1024];
+    float               mono_previous_buffer2[1024];
+    float*              decode_buf_ptr[4];
+    float               decode_buffer_1[1024];
+    float               decode_buffer_2[1024];
+    float               decode_buffer_3[1024];
+    float               decode_buffer_4[1024];
+} COOKContext;
+
+/* debug functions */
+
+#ifdef COOKDEBUG
+static void dump_float_table(float* table, int size, int delimiter) {
+    int i=0;
+    av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i);
+    for (i=0 ; i<size ; i++) {
+        av_log(NULL, AV_LOG_ERROR, "%5.1f, ", table[i]);
+        if ((i+1)%delimiter == 0) av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i+1);
+    }
+}
+
+static void dump_int_table(int* table, int size, int delimiter) {
+    int i=0;
+    av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i);
+    for (i=0 ; i<size ; i++) {
+        av_log(NULL, AV_LOG_ERROR, "%d, ", table[i]);
+        if ((i+1)%delimiter == 0) av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i+1);
+    }
+}
+
+static void dump_short_table(short* table, int size, int delimiter) {
+    int i=0;
+    av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i);
+    for (i=0 ; i<size ; i++) {
+        av_log(NULL, AV_LOG_ERROR, "%d, ", table[i]);
+        if ((i+1)%delimiter == 0) av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i+1);
+    }
+}
+
+#endif
+
+/*************** init functions ***************/
+
+/* table generator */
+static void init_pow2table(COOKContext *q){
+    int i;
+    q->pow2tab[63] = 1.0;
+    for (i=1 ; i<64 ; i++){
+        q->pow2tab[63+i]=(float)pow(2.0,(double)i);
+        q->pow2tab[63-i]=1.0/(float)pow(2.0,(double)i);
+    }
+}
+
+/* table generator */
+static void init_rootpow2table(COOKContext *q){
+    int i;
+    q->rootpow2tab[63] = 1.0;
+    for (i=1 ; i<64 ; i++){
+        q->rootpow2tab[63+i]=sqrt((float)powf(2.0,(float)i));
+        q->rootpow2tab[63-i]=sqrt(1.0/(float)powf(2.0,(float)i));
+    }
+}
+
+/* table generator */
+static void init_gain_table(COOKContext *q) {
+    int i;
+    q->gain_size_factor = q->samples_per_channel/8;
+    for (i=0 ; i<23 ; i++) {
+        q->gain_table[i] = pow((double)q->pow2tab[i+52] ,
+                               (1.0/(double)q->gain_size_factor));
+    }
+    memset(&q->gain_copy, 0, sizeof(COOKgain));
+    memset(&q->gain_current, 0, sizeof(COOKgain));
+    memset(&q->gain_now, 0, sizeof(COOKgain));
+    memset(&q->gain_previous, 0, sizeof(COOKgain));
+}
+
+
+static int init_cook_vlc_tables(COOKContext *q) {
+    int i, result;
+
+    result = 0;
+    for (i=0 ; i<13 ; i++) {
+        result &= init_vlc (&q->envelope_quant_index[i], 9, 24,
+            envelope_quant_index_huffbits[i], 1, 1,
+            envelope_quant_index_huffcodes[i], 2, 2, 0);
+    }
+    av_log(NULL,AV_LOG_DEBUG,"sqvh VLC init\n");
+    for (i=0 ; i<7 ; i++) {
+        result &= init_vlc (&q->sqvh[i], vhvlcsize_tab[i], vhsize_tab[i],
+            cvh_huffbits[i], 1, 1,
+            cvh_huffcodes[i], 2, 2, 0);
+    }
+
+    if (q->nb_channels==2 && q->joint_stereo==1){
+        result &= init_vlc (&q->ccpl, 6, (1<<q->js_vlc_bits)-1,
+            ccpl_huffbits[q->js_vlc_bits-2], 1, 1,
+            ccpl_huffcodes[q->js_vlc_bits-2], 2, 2, 0);
+        av_log(NULL,AV_LOG_DEBUG,"Joint-stereo VLC used.\n");
+    }
+
+    av_log(NULL,AV_LOG_DEBUG,"VLC tables initialized.\n");
+    return result;
+}
+
+static int init_cook_mlt(COOKContext *q) {
+    int j;
+    float alpha;
+
+    /* Allocate the buffers, could be replaced with a static [512]
+       array if needed. */
+    q->mlt_size = q->samples_per_channel;
+    q->mlt_window = av_malloc(sizeof(float)*q->mlt_size);
+    q->mlt_precos = av_malloc(sizeof(float)*q->mlt_size/2);
+    q->mlt_presin = av_malloc(sizeof(float)*q->mlt_size/2);
+    q->mlt_postcos = av_malloc(sizeof(float)*q->mlt_size/2);
+
+    /* Initialize the MLT window: simple sine window. */
+    alpha = M_PI / (2.0 * (float)q->mlt_size);
+    for(j=0 ; j<q->mlt_size ; j++) {
+        q->mlt_window[j] = sin((j + 512.0/(float)q->mlt_size) * alpha);
+    }
+
+    /* pre/post twiddle factors */
+    for (j=0 ; j<q->mlt_size/2 ; j++){
+        q->mlt_precos[j] = cos( ((j+0.25)*M_PI)/q->mlt_size);
+        q->mlt_presin[j] = sin( ((j+0.25)*M_PI)/q->mlt_size);
+        q->mlt_postcos[j] = (float)sqrt(2.0/(float)q->mlt_size)*cos( ((float)j*M_PI) /q->mlt_size); //sqrt(2/MLT_size) = scalefactor
+    }
+
+    /* Initialize the FFT. */
+    ff_fft_init(&q->fft_ctx, av_log2(q->mlt_size)-1, 0);
+    av_log(NULL,AV_LOG_DEBUG,"FFT initialized, order = %d.\n",
+           av_log2(q->samples_per_channel)-1);
+
+    return (int)(q->mlt_window && q->mlt_precos && q->mlt_presin && q->mlt_postcos);
+}
+
+/*************** init functions end ***********/
+
+/**
+ * Cook indata decoding, every 32 bits are XORed with 0x37c511f2.
+ * Why? No idea, some checksum/error detection method maybe.
+ * Nice way to waste CPU cycles.
+ *
+ * @param in        pointer to 32bit array of indata
+ * @param bits      amount of bits
+ * @param out       pointer to 32bit array of outdata
+ */
+
+static inline void decode_bytes(uint8_t* inbuffer, uint8_t* out, int bytes){
+    int i;
+    uint32_t* buf = (uint32_t*) inbuffer;
+    uint32_t* obuf = (uint32_t*) out;
+    /* FIXME: 64 bit platforms would be able to do 64 bits at a time.
+     * I'm too lazy though, should be something like
+     * for(i=0 ; i<bitamount/64 ; i++)
+     *     (int64_t)out[i] = 0x37c511f237c511f2^be2me_64(int64_t)in[i]);
+     * Buffer alignment needs to be checked. */
+
+
+    for(i=0 ; i<bytes/4 ; i++){
+#ifdef WORDS_BIGENDIAN
+        obuf[i] = 0x37c511f2^buf[i];
+#else
+        obuf[i] = 0xf211c537^buf[i];
+#endif
+    }
+}
+
+/**
+ * Cook uninit
+ */
+
+static int cook_decode_close(AVCodecContext *avctx)
+{
+    int i;
+    COOKContext *q = avctx->priv_data;
+    av_log(NULL,AV_LOG_DEBUG, "Deallocating memory.\n");
+
+    /* Free allocated memory buffers. */
+    av_free(q->mlt_window);
+    av_free(q->mlt_precos);
+    av_free(q->mlt_presin);
+    av_free(q->mlt_postcos);
+    av_free(q->frame_reorder_index);
+    av_free(q->frame_reorder_buffer);
+    av_free(q->decoded_bytes_buffer);
+
+    /* Free the transform. */
+    ff_fft_end(&q->fft_ctx);
+
+    /* Free the VLC tables. */
+    for (i=0 ; i<13 ; i++) {
+        free_vlc(&q->envelope_quant_index[i]);
+    }
+    for (i=0 ; i<7 ; i++) {
+        free_vlc(&q->sqvh[i]);
+    }
+    if(q->nb_channels==2 && q->joint_stereo==1 ){
+        free_vlc(&q->ccpl);
+    }
+
+    av_log(NULL,AV_LOG_DEBUG,"Memory deallocated.\n");
+
+    return 0;
+}
+
+/**
+ * Fill the COOKgain structure for the timedomain quantization.
+ *
+ * @param q                 pointer to the COOKContext
+ * @param gaininfo          pointer to the COOKgain
+ */
+
+static void decode_gain_info(GetBitContext *gb, COOKgain* gaininfo) {
+    int i;
+
+    while (get_bits1(gb)) {}
+
+    gaininfo->size = get_bits_count(gb) - 1;     //amount of elements*2 to update
+
+    if (get_bits_count(gb) - 1 <= 0) return;
+
+    for (i=0 ; i<gaininfo->size ; i++){
+        gaininfo->qidx_table1[i] = get_bits(gb,3);
+        if (get_bits1(gb)) {
+            gaininfo->qidx_table2[i] = get_bits(gb,4) - 7;  //convert to signed
+        } else {
+            gaininfo->qidx_table2[i] = -1;
+        }
+    }
+}
+
+/**
+ * Create the quant index table needed for the envelope.
+ *
+ * @param q                 pointer to the COOKContext
+ * @param quant_index_table pointer to the array
+ */
+
+static void decode_envelope(COOKContext *q, int* quant_index_table) {
+    int i,j, vlc_index;
+    int bitbias;
+
+    bitbias = get_bits_count(&q->gb);
+    quant_index_table[0]= get_bits(&q->gb,6) - 6;       //This is used later in categorize
+
+    for (i=1 ; i < q->total_subbands ; i++){
+        vlc_index=i;
+        if (i >= q->js_subband_start * 2) {
+            vlc_index-=q->js_subband_start;
+        } else {
+            vlc_index/=2;
+            if(vlc_index < 1) vlc_index = 1;
+        }
+        if (vlc_index>13) vlc_index = 13;           //the VLC tables >13 are identical to No. 13
+
+        j = get_vlc2(&q->gb, q->envelope_quant_index[vlc_index-1].table,
+                     q->envelope_quant_index[vlc_index-1].bits,2);
+        quant_index_table[i] = quant_index_table[i-1] + j - 12;    //differential encoding
+    }
+}
+
+/**
+ * Create the quant value table.
+ *
+ * @param q                 pointer to the COOKContext
+ * @param quant_value_table pointer to the array
+ */
+
+static void inline dequant_envelope(COOKContext *q, int* quant_index_table,
+                                    float* quant_value_table){
+
+    int i;
+    for(i=0 ; i < q->total_subbands ; i++){
+        quant_value_table[i] = q->rootpow2tab[quant_index_table[i]+63];
+    }
+}
+
+/**
+ * Calculate the category and category_index vector.
+ *
+ * @param q                     pointer to the COOKContext
+ * @param quant_index_table     pointer to the array
+ * @param category              pointer to the category array
+ * @param category_index        pointer to the category_index array
+ */
+
+static void categorize(COOKContext *q, int* quant_index_table,
+                       int* category, int* category_index){
+    int exp_idx, bias, tmpbias, bits_left, num_bits, index, v, i, j;
+    int exp_index2[102];
+    int exp_index1[102];
+
+    int tmp_categorize_array1[128];
+    int tmp_categorize_array1_idx=0;
+    int tmp_categorize_array2[128];
+    int tmp_categorize_array2_idx=0;
+    int category_index_size=0;
+
+    bits_left =  q->bits_per_subpacket - get_bits_count(&q->gb);
+
+    if(bits_left > q->samples_per_channel) {
+        bits_left = q->samples_per_channel +
+                    ((bits_left - q->samples_per_channel)*5)/8;
+        //av_log(NULL, AV_LOG_ERROR, "bits_left = %d\n",bits_left);
+    }
+
+    memset(&exp_index1,0,102*sizeof(int));
+    memset(&exp_index2,0,102*sizeof(int));
+    memset(&tmp_categorize_array1,0,128*sizeof(int));
+    memset(&tmp_categorize_array2,0,128*sizeof(int));
+
+    bias=-32;
+
+    /* Estimate bias. */
+    for (i=32 ; i>0 ; i=i/2){
+        num_bits = 0;
+        index = 0;
+        for (j=q->total_subbands ; j>0 ; j--){
+            exp_idx = (i - quant_index_table[index] + bias) / 2;
+            if (exp_idx<0){
+                exp_idx=0;
+            } else if(exp_idx >7) {
+                exp_idx=7;
+            }
+            index++;
+            num_bits+=expbits_tab[exp_idx];
+        }
+        if(num_bits >= bits_left - 32){
+            bias+=i;
+        }
+    }
+
+    /* Calculate total number of bits. */
+    num_bits=0;
+    for (i=0 ; i<q->total_subbands ; i++) {
+        exp_idx = (bias - quant_index_table[i]) / 2;
+        if (exp_idx<0) {
+            exp_idx=0;
+        } else if(exp_idx >7) {
+            exp_idx=7;
+        }
+        num_bits += expbits_tab[exp_idx];
+        exp_index1[i] = exp_idx;
+        exp_index2[i] = exp_idx;
+    }
+    tmpbias = bias = num_bits;
+
+    for (j = 1 ; j < q->numvector_size ; j++) {
+        if (tmpbias + bias > 2*bits_left) {  /* ---> */
+            int max = -999999;
+            index=-1;
+            for (i=0 ; i<q->total_subbands ; i++){
+                if (exp_index1[i] < 7) {
+                    v = (-2*exp_index1[i]) - quant_index_table[i] - 32;
+                    if ( v >= max) {
+                        max = v;
+                        index = i;
+                    }
+                }
+            }
+            if(index==-1)break;
+            tmp_categorize_array1[tmp_categorize_array1_idx++] = index;
+            tmpbias -= expbits_tab[exp_index1[index]] -
+                       expbits_tab[exp_index1[index]+1];
+            ++exp_index1[index];
+        } else {  /* <--- */
+            int min = 999999;
+            index=-1;
+            for (i=0 ; i<q->total_subbands ; i++){
+                if(exp_index2[i] > 0){
+                    v = (-2*exp_index2[i])-quant_index_table[i];
+                    if ( v < min) {
+                        min = v;
+                        index = i;
+                    }
+                }
+            }
+            if(index == -1)break;
+            tmp_categorize_array2[tmp_categorize_array2_idx++] = index;
+            tmpbias -= expbits_tab[exp_index2[index]] -
+                       expbits_tab[exp_index2[index]-1];
+            --exp_index2[index];
+        }
+    }
+
+    for(i=0 ; i<q->total_subbands ; i++)
+        category[i] = exp_index2[i];
+
+    /* Concatenate the two arrays. */
+    for(i=tmp_categorize_array2_idx-1 ; i >= 0; i--)
+        category_index[category_index_size++] =  tmp_categorize_array2[i];
+
+    for(i=0;i<tmp_categorize_array1_idx;i++)
+        category_index[category_index_size++ ] =  tmp_categorize_array1[i];
+
+    /* FIXME: mc_sich_ra8_20.rm triggers this, not sure with what we
+       should fill the remaining bytes. */
+    for(i=category_index_size;i<q->numvector_size;i++)
+        category_index[i]=0;
+
+}
+
+
+/**
+ * Expand the category vector.
+ *
+ * @param q                     pointer to the COOKContext
+ * @param category              pointer to the category array
+ * @param category_index        pointer to the category_index array
+ */
+
+static void inline expand_category(COOKContext *q, int* category,
+                                   int* category_index){
+    int i;
+    for(i=0 ; i<q->num_vectors ; i++){
+        ++category[category_index[i]];
+    }
+}
+
+/**
+ * The real requantization of the mltcoefs
+ *
+ * @param q                     pointer to the COOKContext
+ * @param index                 index
+ * @param band                  current subband
+ * @param quant_value_table     pointer to the array
+ * @param subband_coef_index    array of indexes to quant_centroid_tab
+ * @param subband_coef_noise    use random noise instead of predetermined value
+ * @param mlt_buffer            pointer to the mlt buffer
+ */
+
+
+static void scalar_dequant(COOKContext *q, int index, int band,
+                           float* quant_value_table, int* subband_coef_index,
+                           int* subband_coef_noise, float* mlt_buffer){
+    int i;
+    float f1;
+
+    for(i=0 ; i<SUBBAND_SIZE ; i++) {
+        if (subband_coef_index[i]) {
+            if (subband_coef_noise[i]) {
+                f1 = -quant_centroid_tab[index][subband_coef_index[i]];
+            } else {
+                f1 = quant_centroid_tab[index][subband_coef_index[i]];
+            }
+        } else {
+            /* noise coding if subband_coef_noise[i] == 0 */
+            q->random_state = q->random_state * 214013 + 2531011;    //typical RNG numbers
+            f1 = randsign[(q->random_state/0x1000000)&1] * dither_tab[index]; //>>31
+        }
+        mlt_buffer[band*20+ i] = f1 * quant_value_table[band];
+    }
+}
+/**
+ * Unpack the subband_coef_index and subband_coef_noise vectors.
+ *
+ * @param q                     pointer to the COOKContext
+ * @param category              pointer to the category array
+ * @param subband_coef_index    array of indexes to quant_centroid_tab
+ * @param subband_coef_noise    use random noise instead of predetermined value
+ */
+
+static int unpack_SQVH(COOKContext *q, int category, int* subband_coef_index,
+                       int* subband_coef_noise) {
+    int i,j;
+    int vlc, vd ,tmp, result;
+    int ub;
+    int cb;
+
+    vd = vd_tab[category];
+    result = 0;
+    for(i=0 ; i<vpr_tab[category] ; i++){
+        ub = get_bits_count(&q->gb);
+        vlc = get_vlc2(&q->gb, q->sqvh[category].table, q->sqvh[category].bits, 3);
+        cb = get_bits_count(&q->gb);
+        if (q->bits_per_subpacket < get_bits_count(&q->gb)){
+            vlc = 0;
+            result = 1;
+        }
+        for(j=vd-1 ; j>=0 ; j--){
+            tmp = (vlc * invradix_tab[category])/0x100000;
+            subband_coef_index[vd*i+j] = vlc - tmp * (kmax_tab[category]+1);
+            vlc = tmp;
+        }
+        for(j=0 ; j<vd ; j++){
+            if (subband_coef_index[i*vd + j]) {
+                if(get_bits_count(&q->gb) < q->bits_per_subpacket){
+                    subband_coef_noise[i*vd+j] = get_bits1(&q->gb);
+                } else {
+                    result=1;
+                    subband_coef_noise[i*vd+j]=0;
+                }
+            } else {
+                subband_coef_noise[i*vd+j]=0;
+            }
+        }
+    }
+    return result;
+}
+
+
+/**
+ * Fill the mlt_buffer with mlt coefficients.
+ *
+ * @param q                 pointer to the COOKContext
+ * @param category          pointer to the category array
+ * @param quant_value_table pointer to the array
+ * @param mlt_buffer        pointer to mlt coefficients
+ */
+
+
+static void decode_vectors(COOKContext* q, int* category,
+                           float* quant_value_table, float* mlt_buffer){
+    /* A zero in this table means that the subband coefficient is
+       random noise coded. */
+    int subband_coef_noise[SUBBAND_SIZE];
+    /* A zero in this table means that the subband coefficient is a
+       positive multiplicator. */
+    int subband_coef_index[SUBBAND_SIZE];
+    int band, j;
+    int index=0;
+
+    for(band=0 ; band<q->total_subbands ; band++){
+        index = category[band];
+        if(category[band] < 7){
+            if(unpack_SQVH(q, category[band], subband_coef_index, subband_coef_noise)){
+                index=7;
+                for(j=0 ; j<q->total_subbands ; j++) category[band+j]=7;
+            }
+        }
+        if(index==7) {
+            memset(subband_coef_index, 0, sizeof(subband_coef_index));
+            memset(subband_coef_noise, 0, sizeof(subband_coef_noise));
+        }
+        scalar_dequant(q, index, band, quant_value_table, subband_coef_index,
+                       subband_coef_noise, mlt_buffer);
+    }
+
+    if(q->total_subbands*SUBBAND_SIZE >= q->samples_per_channel){
+        return;
+    }
+}
+
+
+/**
+ * function for decoding mono data
+ *
+ * @param q                 pointer to the COOKContext
+ * @param mlt_buffer1       pointer to left channel mlt coefficients
+ * @param mlt_buffer2       pointer to right channel mlt coefficients
+ */
+
+static void mono_decode(COOKContext *q, float* mlt_buffer) {
+
+    int category_index[128];
+    float quant_value_table[102];
+    int quant_index_table[102];
+    int category[128];
+
+    memset(&category, 0, 128*sizeof(int));
+    memset(&quant_value_table, 0, 102*sizeof(int));
+    memset(&category_index, 0, 128*sizeof(int));
+
+    decode_envelope(q, quant_index_table);
+    q->num_vectors = get_bits(&q->gb,q->numvector_bits);
+    dequant_envelope(q, quant_index_table, quant_value_table);
+    categorize(q, quant_index_table, category, category_index);
+    expand_category(q, category, category_index);
+    decode_vectors(q, category, quant_value_table, mlt_buffer);
+}
+
+
+/**
+ * The modulated lapped transform, this takes transform coefficients
+ * and transforms them into timedomain samples. This is done through
+ * an FFT-based algorithm with pre- and postrotation steps.
+ * A window and reorder step is also included.
+ *
+ * @param q                 pointer to the COOKContext
+ * @param inbuffer          pointer to the mltcoefficients
+ * @param outbuffer         pointer to the timedomain buffer
+ * @param mlt_tmp           pointer to temporary storage space
+ */
+
+static void cook_imlt(COOKContext *q, float* inbuffer, float* outbuffer,
+                      float* mlt_tmp){
+    int i;
+
+    /* prerotation */
+    for(i=0 ; i<q->mlt_size ; i+=2){
+        outbuffer[i] = (q->mlt_presin[i/2] * inbuffer[q->mlt_size-1-i]) +
+                       (q->mlt_precos[i/2] * inbuffer[i]);
+        outbuffer[i+1] = (q->mlt_precos[i/2] * inbuffer[q->mlt_size-1-i]) -
+                         (q->mlt_presin[i/2] * inbuffer[i]);
+    }
+
+    /* FFT */
+    ff_fft_permute(&q->fft_ctx, (FFTComplex *) outbuffer);
+    ff_fft_calc (&q->fft_ctx, (FFTComplex *) outbuffer);
+
+    /* postrotation */
+    for(i=0 ; i<q->mlt_size ; i+=2){
+        mlt_tmp[i] =               (q->mlt_postcos[(q->mlt_size-1-i)/2] * outbuffer[i+1]) +
+                                   (q->mlt_postcos[i/2] * outbuffer[i]);
+        mlt_tmp[q->mlt_size-1-i] = (q->mlt_postcos[(q->mlt_size-1-i)/2] * outbuffer[i]) -
+                                   (q->mlt_postcos[i/2] * outbuffer[i+1]);
+    }
+
+    /* window and reorder */
+    for(i=0 ; i<q->mlt_size/2 ; i++){
+        outbuffer[i] = mlt_tmp[q->mlt_size/2-1-i] * q->mlt_window[i];
+        outbuffer[q->mlt_size-1-i]= mlt_tmp[q->mlt_size/2-1-i] *
+                                    q->mlt_window[q->mlt_size-1-i];
+        outbuffer[q->mlt_size+i]= mlt_tmp[q->mlt_size/2+i] *
+                                  q->mlt_window[q->mlt_size-1-i];
+        outbuffer[2*q->mlt_size-1-i]= -(mlt_tmp[q->mlt_size/2+i] *
+                                      q->mlt_window[i]);
+    }
+}
+
+
+/**
+ * the actual requantization of the timedomain samples
+ *
+ * @param q                 pointer to the COOKContext
+ * @param buffer            pointer to the timedomain buffer
+ * @param gain_index        index for the block multiplier
+ * @param gain_index_next   index for the next block multiplier
+ */
+
+static void interpolate(COOKContext *q, float* buffer,
+                        int gain_index, int gain_index_next){
+    int i;
+    float fc1, fc2;
+    fc1 = q->pow2tab[gain_index+63];
+
+    if(gain_index == gain_index_next){              //static gain
+        for(i=0 ; i<q->gain_size_factor ; i++){
+            buffer[i]*=fc1;
+        }
+        return;
+    } else {                                        //smooth gain
+        fc2 = q->gain_table[11 + (gain_index_next-gain_index)];
+        for(i=0 ; i<q->gain_size_factor ; i++){
+            buffer[i]*=fc1;
+            fc1*=fc2;
+        }
+        return;
+    }
+}
+
+/**
+ * timedomain requantization of the timedomain samples
+ *
+ * @param q                 pointer to the COOKContext
+ * @param buffer            pointer to the timedomain buffer
+ * @param gain_now          current gain structure
+ * @param gain_previous     previous gain structure
+ */
+
+static void gain_window(COOKContext *q, float* buffer, COOKgain* gain_now,
+                        COOKgain* gain_previous){
+    int i, index;
+    int gain_index[9];
+    int tmp_gain_index;
+
+    gain_index[8]=0;
+    index = gain_previous->size;
+    for (i=7 ; i>=0 ; i--) {
+        if(index && gain_previous->qidx_table1[index-1]==i) {
+            gain_index[i] = gain_previous->qidx_table2[index-1];
+            index--;
+        } else {
+            gain_index[i]=gain_index[i+1];
+        }
+    }
+    /* This is applied to the to be previous data buffer. */
+    for(i=0;i<8;i++){
+        interpolate(q, &buffer[q->samples_per_channel+q->gain_size_factor*i],
+                    gain_index[i], gain_index[i+1]);
+    }
+
+    tmp_gain_index = gain_index[0];
+    index = gain_now->size;
+    for (i=7 ; i>=0 ; i--) {
+        if(index && gain_now->qidx_table1[index-1]==i) {
+            gain_index[i]= gain_now->qidx_table2[index-1];
+            index--;
+        } else {
+            gain_index[i]=gain_index[i+1];
+        }
+    }
+
+    /* This is applied to the to be current block. */
+    for(i=0;i<8;i++){
+        interpolate(q, &buffer[i*q->gain_size_factor],
+                    tmp_gain_index+gain_index[i],
+                    tmp_gain_index+gain_index[i+1]);
+    }
+}
+
+
+/**
+ * mlt overlapping and buffer management
+ *
+ * @param q                 pointer to the COOKContext
+ * @param buffer            pointer to the timedomain buffer
+ * @param gain_now          current gain structure
+ * @param gain_previous     previous gain structure
+ * @param previous_buffer   pointer to the previous buffer to be used for overlapping
+ *
+ */
+
+static void gain_compensate(COOKContext *q, float* buffer, COOKgain* gain_now,
+                            COOKgain* gain_previous, float* previous_buffer) {
+    int i;
+    if((gain_now->size  || gain_previous->size)) {
+        gain_window(q, buffer, gain_now, gain_previous);
+    }
+
+    /* Overlap with the previous block. */
+    for(i=0 ; i<q->samples_per_channel ; i++) buffer[i]+=previous_buffer[i];
+
+    /* Save away the current to be previous block. */
+    memcpy(previous_buffer, buffer+q->samples_per_channel,
+           sizeof(float)*q->samples_per_channel);
+}
+
+
+/**
+ * function for getting the jointstereo coupling information
+ *
+ * @param q                 pointer to the COOKContext
+ * @param decouple_tab      decoupling array
+ *
+ */
+
+static void decouple_info(COOKContext *q, int* decouple_tab){
+    int length, i;
+
+    if(get_bits1(&q->gb)) {
+        if(cplband[q->js_subband_start] > cplband[q->subbands-1]) return;
+
+        length = cplband[q->subbands-1] - cplband[q->js_subband_start] + 1;
+        for (i=0 ; i<length ; i++) {
+            decouple_tab[cplband[q->js_subband_start] + i] = get_vlc2(&q->gb, q->ccpl.table, q->ccpl.bits, 2);
+        }
+        return;
+    }
+
+    if(cplband[q->js_subband_start] > cplband[q->subbands-1]) return;
+
+    length = cplband[q->subbands-1] - cplband[q->js_subband_start] + 1;
+    for (i=0 ; i<length ; i++) {
+       decouple_tab[cplband[q->js_subband_start] + i] = get_bits(&q->gb, q->js_vlc_bits);
+    }
+    return;
+}
+
+
+/**
+ * function for decoding joint stereo data
+ *
+ * @param q                 pointer to the COOKContext
+ * @param mlt_buffer1       pointer to left channel mlt coefficients
+ * @param mlt_buffer2       pointer to right channel mlt coefficients
+ */
+
+static void joint_decode(COOKContext *q, float* mlt_buffer1,
+                         float* mlt_buffer2) {
+    int i,j;
+    int decouple_tab[SUBBAND_SIZE];
+    float decode_buffer[2048];  //Only 1060 might be needed.
+    int idx, cpl_tmp,tmp_idx;
+    float f1,f2;
+    float* cplscale;
+
+    memset(decouple_tab, 0, sizeof(decouple_tab));
+    memset(decode_buffer, 0, sizeof(decode_buffer));
+
+    /* Make sure the buffers are zeroed out. */
+    memset(mlt_buffer1,0, 1024*sizeof(float));
+    memset(mlt_buffer2,0, 1024*sizeof(float));
+    decouple_info(q, decouple_tab);
+    mono_decode(q, decode_buffer);
+
+    /* The two channels are stored interleaved in decode_buffer. */
+    for (i=0 ; i<q->js_subband_start ; i++) {
+        for (j=0 ; j<SUBBAND_SIZE ; j++) {
+            mlt_buffer1[i*20+j] = decode_buffer[i*40+j];
+            mlt_buffer2[i*20+j] = decode_buffer[i*40+20+j];
+        }
+    }
+
+    /* When we reach js_subband_start (the higher frequencies)
+       the coefficients are stored in a coupling scheme. */
+    idx = (1 << q->js_vlc_bits) - 1;
+    if (q->js_subband_start < q->subbands) {
+        for (i=0 ; i<q->subbands ; i++) {
+            cpl_tmp = cplband[i + q->js_subband_start];
+            idx -=decouple_tab[cpl_tmp];
+            cplscale = (float*)cplscales[q->js_vlc_bits-2];  //choose decoupler table
+            f1 = cplscale[decouple_tab[cpl_tmp]];
+            f2 = cplscale[idx-1];
+            for (j=0 ; j<SUBBAND_SIZE ; j++) {
+                tmp_idx = ((2*q->js_subband_start + i)*20)+j;
+                mlt_buffer1[20*(i+q->js_subband_start) + j] = f1 * decode_buffer[tmp_idx];
+                mlt_buffer2[20*(i+q->js_subband_start) + j] = f2 * decode_buffer[tmp_idx];
+            }
+            idx = (1 << q->js_vlc_bits) - 1;
+        }
+    }
+}
+
+/**
+ * Cook subpacket decoding. This function returns one decoded subpacket,
+ * usually 1024 samples per channel.
+ *
+ * @param q                 pointer to the COOKContext
+ * @param inbuffer          pointer to the inbuffer
+ * @param sub_packet_size   subpacket size
+ * @param outbuffer         pointer to the outbuffer
+ * @param pos               the subpacket number in the frame
+ */
+
+
+static int decode_subpacket(COOKContext *q, uint8_t *inbuffer,
+                            int sub_packet_size, int16_t *outbuffer) {
+    int i,j;
+    int value;
+    float* tmp_ptr;
+
+    /* packet dump */
+//    for (i=0 ; i<sub_packet_size ; i++) {
+//        av_log(NULL, AV_LOG_ERROR, "%02x", inbuffer[i]);
+//    }
+//    av_log(NULL, AV_LOG_ERROR, "\n");
+
+    decode_bytes(inbuffer, q->decoded_bytes_buffer, sub_packet_size);
+    init_get_bits(&q->gb, q->decoded_bytes_buffer, sub_packet_size*8);
+    decode_gain_info(&q->gb, &q->gain_current);
+    memcpy(&q->gain_copy, &q->gain_current ,sizeof(COOKgain));  //This copy does not seem to be used. FIXME
+    //fprintf(stdout,"cu bits ds = %d\n",get_bits_count(&q->gb));
+    if(q->nb_channels==2 && q->joint_stereo==1){
+        joint_decode(q, q->decode_buf_ptr[0], q->decode_buf_ptr[2]);
+
+        /* Swap buffer pointers. */
+        tmp_ptr = q->decode_buf_ptr[1];
+        q->decode_buf_ptr[1] = q->decode_buf_ptr[0];
+        q->decode_buf_ptr[0] = tmp_ptr;
+        tmp_ptr = q->decode_buf_ptr[3];
+        q->decode_buf_ptr[3] = q->decode_buf_ptr[2];
+        q->decode_buf_ptr[2] = tmp_ptr;
+
+        /* FIXME: Rethink the gainbuffer handling, maybe a rename?
+           now/previous swap */
+        q->gain_now_ptr = &q->gain_now;
+        q->gain_previous_ptr = &q->gain_previous;
+        for (i=0 ; i<q->nb_channels ; i++){
+
+            cook_imlt(q, q->decode_buf_ptr[i*2], q->mono_mdct_output, q->mlt_tmp);
+            gain_compensate(q, q->mono_mdct_output, q->gain_now_ptr,
+                            q->gain_previous_ptr, q->previous_buffer_ptr[0]);
+
+            /* Swap out the previous buffer. */
+            tmp_ptr = q->previous_buffer_ptr[0];
+            q->previous_buffer_ptr[0] = q->previous_buffer_ptr[1];
+            q->previous_buffer_ptr[1] = tmp_ptr;
+
+            /* Clip and convert the floats to 16 bits. */
+            for (j=0 ; j<q->samples_per_frame ; j++){
+                value = lrintf(q->mono_mdct_output[j]);
+                if(value < -32768) value = -32768;
+                else if(value > 32767) value = 32767;
+                outbuffer[2*j+i] = value;
+            }
+        }
+
+        memcpy(&q->gain_now, &q->gain_previous, sizeof(COOKgain));
+        memcpy(&q->gain_previous, &q->gain_current, sizeof(COOKgain));
+
+    } else if (q->nb_channels==2 && q->joint_stereo==0) {
+        for (i=0 ; i<q->nb_channels ; i++){
+            mono_decode(q, q->decode_buf_ptr[0]);
+
+            av_log(NULL,AV_LOG_ERROR,"Non-joint-stereo files are not supported at the moment, do not report as a bug!\n");
+            tmp_ptr = q->decode_buf_ptr[0];
+            q->decode_buf_ptr[0] = q->decode_buf_ptr[1];
+            q->decode_buf_ptr[1] = q->decode_buf_ptr[2];
+            q->decode_buf_ptr[2] = q->decode_buf_ptr[3];
+            q->decode_buf_ptr[3] = tmp_ptr;
+
+            q->gain_now_ptr = &q->gain_now;
+            q->gain_previous_ptr = &q->gain_previous;
+
+            cook_imlt(q, q->decode_buf_ptr[0], q->mono_mdct_output,q->mlt_tmp);
+            gain_compensate(q, q->mono_mdct_output, q->gain_now_ptr,
+                            q->gain_previous_ptr, q->previous_buffer_ptr[0]);
+            /* Swap out the previous buffer. */
+            tmp_ptr = q->previous_buffer_ptr[0];
+            q->previous_buffer_ptr[0] = q->previous_buffer_ptr[1];
+            q->previous_buffer_ptr[1] = tmp_ptr;
+
+            for (j=0 ; j<q->samples_per_frame ; j++){
+                value = lrintf(q->mono_mdct_output[j]);
+                if(value < -32768) value = -32768;
+                else if(value > 32767) value = 32767;
+                outbuffer[2*j+i] = value;
+            }
+            memcpy(&q->gain_now, &q->gain_previous, sizeof(COOKgain));
+            memcpy(&q->gain_previous, &q->gain_current, sizeof(COOKgain));
+        }
+    } else {
+        mono_decode(q, q->decode_buf_ptr[0]);
+
+        /* Swap buffer pointers. */
+        tmp_ptr = q->decode_buf_ptr[1];
+        q->decode_buf_ptr[1] = q->decode_buf_ptr[0];
+        q->decode_buf_ptr[0] = tmp_ptr;
+
+        /* FIXME: Rethink the gainbuffer handling, maybe a rename?
+           now/previous swap */
+        q->gain_now_ptr = &q->gain_now;
+        q->gain_previous_ptr = &q->gain_previous;
+
+        cook_imlt(q, q->decode_buf_ptr[0], q->mono_mdct_output,q->mlt_tmp);
+        gain_compensate(q, q->mono_mdct_output, q->gain_now_ptr,
+                        q->gain_previous_ptr, q->mono_previous_buffer1);
+
+        /* Clip and convert the floats to 16 bits */
+        for (j=0 ; j<q->samples_per_frame ; j++){
+            value = lrintf(q->mono_mdct_output[j]);
+            if(value < -32768) value = -32768;
+            else if(value > 32767) value = 32767;
+            outbuffer[j] = value;
+        }
+        memcpy(&q->gain_now, &q->gain_previous, sizeof(COOKgain));
+        memcpy(&q->gain_previous, &q->gain_current, sizeof(COOKgain));
+    }
+    /* FIXME: Shouldn't the total number of bytes be returned? */
+    return /*q->nb_channels*/ q->samples_per_frame * sizeof(int16_t);
+}
+
+
+/**
+ * Cook frame decoding
+ *
+ * @param avctx     pointer to the AVCodecContext
+ */
+
+static int cook_decode_frame(AVCodecContext *avctx,
+            void *data, int *data_size,
+            uint8_t *buf, int buf_size) {
+    /* This stuff is quite messy, the Cook packets are sent unordered
+     * and need to be ordered before they are sent to the rest of the
+     * decoder. The order can be found in the q->frame_reorder_index.
+     * Currently decoding of the last packets is not handled at
+     * all. FIXME */
+
+    COOKContext *q = avctx->priv_data;
+
+    if (buf_size < avctx->block_align)
+        return buf_size;
+
+    *data_size = decode_subpacket(q, buf, avctx->block_align, data);
+
+    return avctx->block_align;
+}
+#ifdef COOKDEBUG
+static void dump_cook_context(COOKContext *q, COOKextradata *e)
+{
+    //int i=0;
+#define PRINT(a,b) av_log(NULL,AV_LOG_ERROR," %s = %d\n", a, b);
+    av_log(NULL,AV_LOG_ERROR,"COOKextradata\n");
+    av_log(NULL,AV_LOG_ERROR,"cookversion=%x\n",e->cookversion);
+    if (e->cookversion > MONO_COOK2) {
+        PRINT("js_subband_start",e->js_subband_start);
+        PRINT("js_vlc_bits",e->js_vlc_bits);
+    }
+    av_log(NULL,AV_LOG_ERROR,"COOKContext\n");
+    PRINT("nb_channels",q->nb_channels);
+    PRINT("bit_rate",q->bit_rate);
+    PRINT("sample_rate",q->sample_rate);
+    PRINT("samples_per_channel",q->samples_per_channel);
+    PRINT("samples_per_frame",q->samples_per_frame);
+    PRINT("subbands",q->subbands);
+    PRINT("random_state",q->random_state);
+    PRINT("mlt_size",q->mlt_size);
+    PRINT("js_subband_start",q->js_subband_start);
+    PRINT("numvector_bits",q->numvector_bits);
+    PRINT("numvector_size",q->numvector_size);
+    PRINT("total_subbands",q->total_subbands);
+    PRINT("frame_reorder_counter",q->frame_reorder_counter);
+    PRINT("frame_reorder_index_size",q->frame_reorder_index_size);
+}
+#endif
+/**
+ * Cook initialization
+ *
+ * @param avctx     pointer to the AVCodecContext
+ */
+
+static int cook_decode_init(AVCodecContext *avctx)
+{
+    COOKextradata *e = avctx->extradata;
+    COOKContext *q = avctx->priv_data;
+
+    /* Take care of the codec specific extradata. */
+    if (avctx->extradata_size <= 0) {
+        av_log(NULL,AV_LOG_ERROR,"Necessary extradata missing!\n");
+        return -1;
+    } else {
+        /* 8 for mono, 16 for stereo, ? for multichannel
+           Swap to right endianness so we don't need to care later on. */
+        av_log(NULL,AV_LOG_DEBUG,"codecdata_length=%d\n",avctx->extradata_size);
+        if (avctx->extradata_size >= 8){
+            e->cookversion = be2me_32(e->cookversion);
+            e->samples_per_frame = be2me_16(e->samples_per_frame);
+            e->subbands = be2me_16(e->subbands);
+        }
+        if (avctx->extradata_size >= 16){
+            e->js_subband_start = be2me_16(e->js_subband_start);
+            e->js_vlc_bits = be2me_16(e->js_vlc_bits);
+        }
+    }
+
+    /* Take data from the AVCodecContext (RM container). */
+    q->sample_rate = avctx->sample_rate;
+    q->nb_channels = avctx->channels;
+    q->bit_rate = avctx->bit_rate;
+
+    /* Initialize state. */
+    q->random_state = 1;
+
+    /* Initialize extradata related variables. */
+    q->samples_per_channel = e->samples_per_frame / q->nb_channels;
+    q->samples_per_frame = e->samples_per_frame;
+    q->subbands = e->subbands;
+    q->bits_per_subpacket = avctx->block_align * 8;
+
+    /* Initialize default data states. */
+    q->js_subband_start = 0;
+    q->numvector_bits = 5;
+    q->total_subbands = q->subbands;
+
+    /* Initialize version-dependent variables */
+    av_log(NULL,AV_LOG_DEBUG,"e->cookversion=%x\n",e->cookversion);
+    switch (e->cookversion) {
+        case MONO_COOK1:
+            if (q->nb_channels != 1) {
+                av_log(NULL,AV_LOG_ERROR,"Container channels != 1, report sample!\n");
+                return -1;
+            }
+            av_log(NULL,AV_LOG_DEBUG,"MONO_COOK1\n");
+            break;
+        case MONO_COOK2:
+            if (q->nb_channels != 1) {
+                q->joint_stereo = 0;
+                av_log(NULL,AV_LOG_ERROR,"Non-joint-stereo files are not supported at the moment!\n");
+                return -1;
+            }
+            av_log(NULL,AV_LOG_DEBUG,"MONO_COOK2\n");
+            break;
+        case JOINT_STEREO:
+            if (q->nb_channels != 2) {
+                av_log(NULL,AV_LOG_ERROR,"Container channels != 2, report sample!\n");
+                return -1;
+            }
+            av_log(NULL,AV_LOG_DEBUG,"JOINT_STEREO\n");
+            if (avctx->extradata_size >= 16){
+                q->total_subbands = q->subbands + e->js_subband_start;
+                q->js_subband_start = e->js_subband_start;
+                q->joint_stereo = 1;
+                q->js_vlc_bits = e->js_vlc_bits;
+            }
+            if (q->samples_per_channel > 256) {
+                q->numvector_bits++;   // q->numvector_bits  = 6
+            }
+            if (q->samples_per_channel > 512) {
+                q->numvector_bits++;   // q->numvector_bits  = 7
+            }
+            break;
+        case MC_COOK:
+            av_log(NULL,AV_LOG_ERROR,"MC_COOK not supported!\n");
+            return -1;
+            break;
+        default:
+            av_log(NULL,AV_LOG_ERROR,"Unknown Cook version, report sample!\n");
+            return -1;
+            break;
+    }
+
+    /* Initialize variable relations */
+    q->mlt_size = q->samples_per_channel;
+    q->numvector_size = (1 << q->numvector_bits);
+
+    /* Generate tables */
+    init_rootpow2table(q);
+    init_pow2table(q);
+    init_gain_table(q);
+
+    if (init_cook_vlc_tables(q) != 0)
+        return -1;
+
+    /* Pad the databuffer with FF_INPUT_BUFFER_PADDING_SIZE,
+       this is for the bitstreamreader. */
+    if ((q->decoded_bytes_buffer = av_mallocz((avctx->block_align+(4-avctx->block_align%4) + FF_INPUT_BUFFER_PADDING_SIZE)*sizeof(uint8_t)))  == NULL)
+        return -1;
+
+    q->decode_buf_ptr[0] = q->decode_buffer_1;
+    q->decode_buf_ptr[1] = q->decode_buffer_2;
+    q->decode_buf_ptr[2] = q->decode_buffer_3;
+    q->decode_buf_ptr[3] = q->decode_buffer_4;
+
+    q->previous_buffer_ptr[0] = q->mono_previous_buffer1;
+    q->previous_buffer_ptr[1] = q->mono_previous_buffer2;
+
+    memset(q->decode_buffer_1,0,1024*sizeof(float));
+    memset(q->decode_buffer_2,0,1024*sizeof(float));
+    memset(q->decode_buffer_3,0,1024*sizeof(float));
+    memset(q->decode_buffer_4,0,1024*sizeof(float));
+
+    /* Initialize transform. */
+    if ( init_cook_mlt(q) == 0 )
+        return -1;
+
+    //dump_cook_context(q,e);
+    return 0;
+}
+
+
+AVCodec cook_decoder =
+{
+    .name = "cook",
+    .type = CODEC_TYPE_AUDIO,
+    .id = CODEC_ID_COOK,
+    .priv_data_size = sizeof(COOKContext),
+    .init = cook_decode_init,
+    .close = cook_decode_close,
+    .decode = cook_decode_frame,
+};