3 * Copyright (c) 2004-2012 Michael Niedermayer <michaelni@gmx.at>
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 * @author Michael Niedermayer <michaelni@gmx.at>
28 int RENAME(swri_resample)(ResampleContext *c, DELEM *dst, const DELEM *src, int *consumed, int src_size, int dst_size, int update_ctx){
32 int dst_incr_frac= c->dst_incr % c->src_incr;
33 int dst_incr= c->dst_incr / c->src_incr;
34 int compensation_distance= c->compensation_distance;
36 av_assert1(c->filter_shift == FILTER_SHIFT);
37 av_assert1(c->felem_size == sizeof(FELEM));
39 if(compensation_distance == 0 && c->filter_length == 1 && c->phase_shift==0){
40 int64_t index2= ((int64_t)index)<<32;
41 int64_t incr= (1LL<<32) * c->dst_incr / c->src_incr;
42 dst_size= FFMIN(dst_size, (src_size-1-index) * (int64_t)c->src_incr / c->dst_incr);
44 for(dst_index=0; dst_index < dst_size; dst_index++){
45 dst[dst_index] = src[index2>>32];
48 index += dst_index * dst_incr;
49 index += (frac + dst_index * (int64_t)dst_incr_frac) / c->src_incr;
50 frac = (frac + dst_index * (int64_t)dst_incr_frac) % c->src_incr;
51 }else if(compensation_distance == 0 && !c->linear && index >= 0){
52 for(dst_index=0; dst_index < dst_size; dst_index++){
53 FELEM *filter= ((FELEM*)c->filter_bank) + c->filter_alloc*(index & c->phase_mask);
54 int sample_index= index >> c->phase_shift;
56 if(sample_index + c->filter_length > src_size){
63 for(i=0; i<c->filter_length; i++){
64 val += src[sample_index + i] * (FELEM2)filter[i];
66 OUT(dst[dst_index], val);
70 frac += dst_incr_frac;
72 if(frac >= c->src_incr){
78 for(dst_index=0; dst_index < dst_size; dst_index++){
79 FELEM *filter= ((FELEM*)c->filter_bank) + c->filter_alloc*(index & c->phase_mask);
80 int sample_index= index >> c->phase_shift;
83 if(sample_index + c->filter_length > src_size || -sample_index >= src_size){
85 }else if(sample_index < 0){
86 for(i=0; i<c->filter_length; i++)
87 val += src[FFABS(sample_index + i)] * filter[i];
90 for(i=0; i<c->filter_length; i++){
91 val += src[sample_index + i] * (FELEM2)filter[i];
92 v2 += src[sample_index + i] * (FELEM2)filter[i + c->filter_alloc];
94 val+=(v2-val)*(FELEML)frac / c->src_incr;
96 for(i=0; i<c->filter_length; i++){
97 val += src[sample_index + i] * (FELEM2)filter[i];
101 OUT(dst[dst_index], val);
103 frac += dst_incr_frac;
105 if(frac >= c->src_incr){
110 if(dst_index + 1 == compensation_distance){
111 compensation_distance= 0;
112 dst_incr_frac= c->ideal_dst_incr % c->src_incr;
113 dst_incr= c->ideal_dst_incr / c->src_incr;
117 *consumed= FFMAX(index, 0) >> c->phase_shift;
118 if(index>=0) index &= c->phase_mask;
120 if(compensation_distance){
121 compensation_distance -= dst_index;
122 av_assert1(compensation_distance > 0);
127 c->dst_incr= dst_incr_frac + c->src_incr*dst_incr;
128 c->compensation_distance= compensation_distance;
131 if(update_ctx && !c->compensation_distance){
133 av_resample_compensate(c, rand() % (8000*2) - 8000, 8000*2);
134 av_log(NULL, AV_LOG_DEBUG, "%d %d %d\n", c->dst_incr, c->ideal_dst_incr, c->compensation_distance);