yading@11: /*
yading@11:  * audio resampling
yading@11:  * Copyright (c) 2004-2012 Michael Niedermayer <michaelni@gmx.at>
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: /**
yading@11:  * @file
yading@11:  * audio resampling
yading@11:  * @author Michael Niedermayer <michaelni@gmx.at>
yading@11:  */
yading@11: 
yading@11: #if defined(TEMPLATE_RESAMPLE_DBL)
yading@11: #    define RENAME(N) N ## _double
yading@11: #    define FILTER_SHIFT 0
yading@11: #    define DELEM  double
yading@11: #    define FELEM  double
yading@11: #    define FELEM2 double
yading@11: #    define FELEML double
yading@11: #    define OUT(d, v) d = v
yading@11: 
yading@11: #elif defined(TEMPLATE_RESAMPLE_FLT)
yading@11: #    define RENAME(N) N ## _float
yading@11: #    define FILTER_SHIFT 0
yading@11: #    define DELEM  float
yading@11: #    define FELEM  float
yading@11: #    define FELEM2 float
yading@11: #    define FELEML float
yading@11: #    define OUT(d, v) d = v
yading@11: 
yading@11: #elif defined(TEMPLATE_RESAMPLE_S32)
yading@11: #    define RENAME(N) N ## _int32
yading@11: #    define FILTER_SHIFT 30
yading@11: #    define DELEM  int32_t
yading@11: #    define FELEM  int32_t
yading@11: #    define FELEM2 int64_t
yading@11: #    define FELEML int64_t
yading@11: #    define FELEM_MAX INT32_MAX
yading@11: #    define FELEM_MIN INT32_MIN
yading@11: #    define OUT(d, v) v = (v + (1<<(FILTER_SHIFT-1)))>>FILTER_SHIFT;\
yading@11:                       d = (uint64_t)(v + 0x80000000) > 0xFFFFFFFF ? (v>>63) ^ 0x7FFFFFFF : v
yading@11: 
yading@11: #elif    defined(TEMPLATE_RESAMPLE_S16)      \
yading@11:       || defined(TEMPLATE_RESAMPLE_S16_MMX2) \
yading@11:       || defined(TEMPLATE_RESAMPLE_S16_SSSE3)
yading@11: 
yading@11: #    define FILTER_SHIFT 15
yading@11: #    define DELEM  int16_t
yading@11: #    define FELEM  int16_t
yading@11: #    define FELEM2 int32_t
yading@11: #    define FELEML int64_t
yading@11: #    define FELEM_MAX INT16_MAX
yading@11: #    define FELEM_MIN INT16_MIN
yading@11: #    define OUT(d, v) v = (v + (1<<(FILTER_SHIFT-1)))>>FILTER_SHIFT;\
yading@11:                       d = (unsigned)(v + 32768) > 65535 ? (v>>31) ^ 32767 : v
yading@11: 
yading@11: #    if defined(TEMPLATE_RESAMPLE_S16)
yading@11: #        define RENAME(N) N ## _int16
yading@11: #    elif defined(TEMPLATE_RESAMPLE_S16_MMX2)
yading@11: #        define COMMON_CORE COMMON_CORE_INT16_MMX2
yading@11: #        define RENAME(N) N ## _int16_mmx2
yading@11: #    elif defined(TEMPLATE_RESAMPLE_S16_SSSE3)
yading@11: #        define COMMON_CORE COMMON_CORE_INT16_SSSE3
yading@11: #        define RENAME(N) N ## _int16_ssse3
yading@11: #    endif
yading@11: 
yading@11: #endif
yading@11: 
yading@11: int RENAME(swri_resample)(ResampleContext *c, DELEM *dst, const DELEM *src, int *consumed, int src_size, int dst_size, int update_ctx){
yading@11:     int dst_index, i;
yading@11:     int index= c->index;
yading@11:     int frac= c->frac;
yading@11:     int dst_incr_frac= c->dst_incr % c->src_incr;
yading@11:     int dst_incr=      c->dst_incr / c->src_incr;
yading@11:     int compensation_distance= c->compensation_distance;
yading@11: 
yading@11:     av_assert1(c->filter_shift == FILTER_SHIFT);
yading@11:     av_assert1(c->felem_size == sizeof(FELEM));
yading@11: 
yading@11:     if(compensation_distance == 0 && c->filter_length == 1 && c->phase_shift==0){
yading@11:         int64_t index2= ((int64_t)index)<<32;
yading@11:         int64_t incr= (1LL<<32) * c->dst_incr / c->src_incr;
yading@11:         dst_size= FFMIN(dst_size, (src_size-1-index) * (int64_t)c->src_incr / c->dst_incr);
yading@11: 
yading@11:         for(dst_index=0; dst_index < dst_size; dst_index++){
yading@11:             dst[dst_index] = src[index2>>32];
yading@11:             index2 += incr;
yading@11:         }
yading@11:         index += dst_index * dst_incr;
yading@11:         index += (frac + dst_index * (int64_t)dst_incr_frac) / c->src_incr;
yading@11:         frac   = (frac + dst_index * (int64_t)dst_incr_frac) % c->src_incr;
yading@11:         av_assert2(index >= 0);
yading@11:         *consumed= index >> c->phase_shift;
yading@11:         index &= c->phase_mask;
yading@11:     }else if(compensation_distance == 0 && !c->linear && index >= 0){
yading@11:         int sample_index = 0;
yading@11:         for(dst_index=0; dst_index < dst_size; dst_index++){
yading@11:             FELEM *filter;
yading@11:             sample_index += index >> c->phase_shift;
yading@11:             index &= c->phase_mask;
yading@11:             filter= ((FELEM*)c->filter_bank) + c->filter_alloc*index;
yading@11: 
yading@11:             if(sample_index + c->filter_length > src_size){
yading@11:                 break;
yading@11:             }else{
yading@11: #ifdef COMMON_CORE
yading@11:                 COMMON_CORE
yading@11: #else
yading@11:                 FELEM2 val=0;
yading@11:                 for(i=0; i<c->filter_length; i++){
yading@11:                     val += src[sample_index + i] * (FELEM2)filter[i];
yading@11:                 }
yading@11:                 OUT(dst[dst_index], val);
yading@11: #endif
yading@11:             }
yading@11: 
yading@11:             frac += dst_incr_frac;
yading@11:             index += dst_incr;
yading@11:             if(frac >= c->src_incr){
yading@11:                 frac -= c->src_incr;
yading@11:                 index++;
yading@11:             }
yading@11:         }
yading@11:         *consumed = sample_index;
yading@11:     }else{
yading@11:         int sample_index = 0;
yading@11:         for(dst_index=0; dst_index < dst_size; dst_index++){
yading@11:             FELEM *filter;
yading@11:             FELEM2 val=0;
yading@11: 
yading@11:             sample_index += index >> c->phase_shift;
yading@11:             index &= c->phase_mask;
yading@11:             filter = ((FELEM*)c->filter_bank) + c->filter_alloc*index;
yading@11: 
yading@11:             if(sample_index + c->filter_length > src_size || -sample_index >= src_size){
yading@11:                 break;
yading@11:             }else if(sample_index < 0){
yading@11:                 for(i=0; i<c->filter_length; i++)
yading@11:                     val += src[FFABS(sample_index + i)] * (FELEM2)filter[i];
yading@11:             }else if(c->linear){
yading@11:                 FELEM2 v2=0;
yading@11:                 for(i=0; i<c->filter_length; i++){
yading@11:                     val += src[sample_index + i] * (FELEM2)filter[i];
yading@11:                     v2  += src[sample_index + i] * (FELEM2)filter[i + c->filter_alloc];
yading@11:                 }
yading@11:                 val+=(v2-val)*(FELEML)frac / c->src_incr;
yading@11:             }else{
yading@11:                 for(i=0; i<c->filter_length; i++){
yading@11:                     val += src[sample_index + i] * (FELEM2)filter[i];
yading@11:                 }
yading@11:             }
yading@11: 
yading@11:             OUT(dst[dst_index], val);
yading@11: 
yading@11:             frac += dst_incr_frac;
yading@11:             index += dst_incr;
yading@11:             if(frac >= c->src_incr){
yading@11:                 frac -= c->src_incr;
yading@11:                 index++;
yading@11:             }
yading@11: 
yading@11:             if(dst_index + 1 == compensation_distance){
yading@11:                 compensation_distance= 0;
yading@11:                 dst_incr_frac= c->ideal_dst_incr % c->src_incr;
yading@11:                 dst_incr=      c->ideal_dst_incr / c->src_incr;
yading@11:             }
yading@11:         }
yading@11:         *consumed= FFMAX(sample_index, 0);
yading@11:         index += FFMIN(sample_index, 0) << c->phase_shift;
yading@11: 
yading@11:         if(compensation_distance){
yading@11:             compensation_distance -= dst_index;
yading@11:             av_assert1(compensation_distance > 0);
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     if(update_ctx){
yading@11:         c->frac= frac;
yading@11:         c->index= index;
yading@11:         c->dst_incr= dst_incr_frac + c->src_incr*dst_incr;
yading@11:         c->compensation_distance= compensation_distance;
yading@11:     }
yading@11: 
yading@11:     return dst_index;
yading@11: }
yading@11: 
yading@11: #undef COMMON_CORE
yading@11: #undef RENAME
yading@11: #undef FILTER_SHIFT
yading@11: #undef DELEM
yading@11: #undef FELEM
yading@11: #undef FELEM2
yading@11: #undef FELEML
yading@11: #undef FELEM_MAX
yading@11: #undef FELEM_MIN
yading@11: #undef OUT