📄 cook_fix_all.c
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- * 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 quant_index quantisation index
- * @param subband_coef_index array of indexes to quant_centroid_tab
- * @param subband_coef_sign signs of coefficients
- * @param mlt_p pointer into the mlt buffer
- */
-
-static void scalar_dequant(COOKContext *q, int index, int quant_index,
- int* subband_coef_index, int* subband_coef_sign,
- float* mlt_p){
- int i;
- float f1;
-
- for(i=0 ; i<SUBBAND_SIZE ; i++) {
- if (subband_coef_index[i]) {
- f1 = quant_centroid_tab[index][subband_coef_index[i]];
- if (subband_coef_sign[i]) f1 = -f1;
- } else {
- /* noise coding if subband_coef_index[i] == 0 */
- f1 = dither_tab[index];
- if (av_random(&q->random_state) < 0x80000000) f1 = -f1;
- }
- mlt_p[i] = f1 * q->rootpow2tab[quant_index+63];
- }
-}
-/**
- * Unpack the subband_coef_index and subband_coef_sign 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_sign signs of coefficients
- */
-
-static int unpack_SQVH(COOKContext *q, int category, int* subband_coef_index,
- int* subband_coef_sign) {
- 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_sign[i*vd+j] = get_bits1(&q->gb);
- } else {
- result=1;
- subband_coef_sign[i*vd+j]=0;
- }
- } else {
- subband_coef_sign[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_index_table pointer to the array
- * @param mlt_buffer pointer to mlt coefficients
- */
-
-
-static void decode_vectors(COOKContext* q, int* category,
- int *quant_index_table, float* mlt_buffer){
- /* A zero in this table means that the subband coefficient is
- random noise coded. */
- int subband_coef_index[SUBBAND_SIZE];
- /* A zero in this table means that the subband coefficient is a
- positive multiplicator. */
- int subband_coef_sign[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_sign)){
- 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_sign, 0, sizeof(subband_coef_sign));
- }
- scalar_dequant(q, index, quant_index_table[band],
- subband_coef_index, subband_coef_sign,
- &mlt_buffer[band * 20]);
- }
-
- if(q->total_subbands*SUBBAND_SIZE >= q->samples_per_channel){
- return;
- } /* FIXME: should this be removed, or moved into loop above? */
-}
-
-
-/**
- * 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];
- int quant_index_table[102];
- int category[128];
-
- memset(&category, 0, 128*sizeof(int));
- memset(&category_index, 0, 128*sizeof(int));
-
- decode_envelope(q, quant_index_table);
- q->num_vectors = get_bits(&q->gb,q->log2_numvector_size);
- categorize(q, quant_index_table, category, category_index);
- expand_category(q, category, category_index);
- decode_vectors(q, category, quant_index_table, mlt_buffer);
-}
-
-
-/**
- * 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;
- }
-}
-
-
-/**
- * The modulated lapped transform, this takes transform coefficients
- * and transforms them into timedomain samples.
- * Apply transform window, overlap buffers, apply gain profile
- * and buffer management.
- *
- * @param q pointer to the COOKContext
- * @param inbuffer pointer to the mltcoefficients
- * @param gains_ptr current and previous gains
- * @param previous_buffer pointer to the previous buffer to be used for overlapping
- */
-
-static void imlt_gain(COOKContext *q, float *inbuffer,
- cook_gains *gains_ptr, float* previous_buffer)
-{
- const float fc = q->pow2tab[gains_ptr->previous[0] + 63];
- float *buffer0 = q->mono_mdct_output;
- float *buffer1 = q->mono_mdct_output + q->samples_per_channel;
- int i;
-
- /* Inverse modified discrete cosine transform */
- q->mdct_ctx.fft.imdct_calc(&q->mdct_ctx, q->mono_mdct_output,
- inbuffer, q->mdct_tmp);
-
- /* The weird thing here, is that the two halves of the time domain
- * buffer are swapped. Also, the newest data, that we save away for
- * next frame, has the wrong sign. Hence the subtraction below.
- * Almost sounds like a complex conjugate/reverse data/FFT effect.
- */
-
- /* Apply window and overlap */
- for(i = 0; i < q->samples_per_channel; i++){
- buffer1[i] = buffer1[i] * fc * q->mlt_window[i] -
- previous_buffer[i] * q->mlt_window[q->samples_per_channel - 1 - i];
- }
-
- /* Apply gain profile */
- for (i = 0; i < 8; i++) {
- if (gains_ptr->now[i] || gains_ptr->now[i + 1])
- interpolate(q, &buffer1[q->gain_size_factor * i],
- gains_ptr->now[i], gains_ptr->now[i + 1]);
- }
-
- /* Save away the current to be previous block. */
- memcpy(previous_buffer, buffer0, 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[1060];
- 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;
- for (i=q->js_subband_start ; i<q->subbands ; i++) {
- cpl_tmp = cplband[i];
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