diff options
Diffstat (limited to 'libswresample/resample_template.c')
-rw-r--r-- | libswresample/resample_template.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/libswresample/resample_template.c b/libswresample/resample_template.c new file mode 100644 index 0000000..5bc12bc --- /dev/null +++ b/libswresample/resample_template.c @@ -0,0 +1,211 @@ +/* + * audio resampling + * Copyright (c) 2004-2012 Michael Niedermayer <michaelni@gmx.at> + * + * 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 + */ + +/** + * @file + * audio resampling + * @author Michael Niedermayer <michaelni@gmx.at> + */ + +#if defined(TEMPLATE_RESAMPLE_DBL) +# define RENAME(N) N ## _double +# define FILTER_SHIFT 0 +# define DELEM double +# define FELEM double +# define FELEM2 double +# define FELEML double +# define OUT(d, v) d = v + +#elif defined(TEMPLATE_RESAMPLE_FLT) +# define RENAME(N) N ## _float +# define FILTER_SHIFT 0 +# define DELEM float +# define FELEM float +# define FELEM2 float +# define FELEML float +# define OUT(d, v) d = v + +#elif defined(TEMPLATE_RESAMPLE_S32) +# define RENAME(N) N ## _int32 +# define FILTER_SHIFT 30 +# define DELEM int32_t +# define FELEM int32_t +# define FELEM2 int64_t +# define FELEML int64_t +# define FELEM_MAX INT32_MAX +# define FELEM_MIN INT32_MIN +# define OUT(d, v) v = (v + (1<<(FILTER_SHIFT-1)))>>FILTER_SHIFT;\ + d = (uint64_t)(v + 0x80000000) > 0xFFFFFFFF ? (v>>63) ^ 0x7FFFFFFF : v + +#elif defined(TEMPLATE_RESAMPLE_S16) \ + || defined(TEMPLATE_RESAMPLE_S16_MMX2) \ + || defined(TEMPLATE_RESAMPLE_S16_SSSE3) + +# define FILTER_SHIFT 15 +# define DELEM int16_t +# define FELEM int16_t +# define FELEM2 int32_t +# define FELEML int64_t +# define FELEM_MAX INT16_MAX +# define FELEM_MIN INT16_MIN +# define OUT(d, v) v = (v + (1<<(FILTER_SHIFT-1)))>>FILTER_SHIFT;\ + d = (unsigned)(v + 32768) > 65535 ? (v>>31) ^ 32767 : v + +# if defined(TEMPLATE_RESAMPLE_S16) +# define RENAME(N) N ## _int16 +# elif defined(TEMPLATE_RESAMPLE_S16_MMX2) +# define COMMON_CORE COMMON_CORE_INT16_MMX2 +# define RENAME(N) N ## _int16_mmx2 +# elif defined(TEMPLATE_RESAMPLE_S16_SSSE3) +# define COMMON_CORE COMMON_CORE_INT16_SSSE3 +# define RENAME(N) N ## _int16_ssse3 +# endif + +#endif + +int RENAME(swri_resample)(ResampleContext *c, DELEM *dst, const DELEM *src, int *consumed, int src_size, int dst_size, int update_ctx){ + int dst_index, i; + int index= c->index; + int frac= c->frac; + int dst_incr_frac= c->dst_incr % c->src_incr; + int dst_incr= c->dst_incr / c->src_incr; + int compensation_distance= c->compensation_distance; + + av_assert1(c->filter_shift == FILTER_SHIFT); + av_assert1(c->felem_size == sizeof(FELEM)); + + if(compensation_distance == 0 && c->filter_length == 1 && c->phase_shift==0){ + int64_t index2= ((int64_t)index)<<32; + int64_t incr= (1LL<<32) * c->dst_incr / c->src_incr; + dst_size= FFMIN(dst_size, (src_size-1-index) * (int64_t)c->src_incr / c->dst_incr); + + for(dst_index=0; dst_index < dst_size; dst_index++){ + dst[dst_index] = src[index2>>32]; + index2 += incr; + } + index += dst_index * dst_incr; + index += (frac + dst_index * (int64_t)dst_incr_frac) / c->src_incr; + frac = (frac + dst_index * (int64_t)dst_incr_frac) % c->src_incr; + av_assert2(index >= 0); + *consumed= index >> c->phase_shift; + index &= c->phase_mask; + }else if(compensation_distance == 0 && !c->linear && index >= 0){ + int sample_index = 0; + for(dst_index=0; dst_index < dst_size; dst_index++){ + FELEM *filter; + sample_index += index >> c->phase_shift; + index &= c->phase_mask; + filter= ((FELEM*)c->filter_bank) + c->filter_alloc*index; + + if(sample_index + c->filter_length > src_size){ + break; + }else{ +#ifdef COMMON_CORE + COMMON_CORE +#else + FELEM2 val=0; + for(i=0; i<c->filter_length; i++){ + val += src[sample_index + i] * (FELEM2)filter[i]; + } + OUT(dst[dst_index], val); +#endif + } + + frac += dst_incr_frac; + index += dst_incr; + if(frac >= c->src_incr){ + frac -= c->src_incr; + index++; + } + } + *consumed = sample_index; + }else{ + int sample_index = 0; + for(dst_index=0; dst_index < dst_size; dst_index++){ + FELEM *filter; + FELEM2 val=0; + + sample_index += index >> c->phase_shift; + index &= c->phase_mask; + filter = ((FELEM*)c->filter_bank) + c->filter_alloc*index; + + if(sample_index + c->filter_length > src_size || -sample_index >= src_size){ + break; + }else if(sample_index < 0){ + for(i=0; i<c->filter_length; i++) + val += src[FFABS(sample_index + i)] * (FELEM2)filter[i]; + }else if(c->linear){ + FELEM2 v2=0; + for(i=0; i<c->filter_length; i++){ + val += src[sample_index + i] * (FELEM2)filter[i]; + v2 += src[sample_index + i] * (FELEM2)filter[i + c->filter_alloc]; + } + val+=(v2-val)*(FELEML)frac / c->src_incr; + }else{ + for(i=0; i<c->filter_length; i++){ + val += src[sample_index + i] * (FELEM2)filter[i]; + } + } + + OUT(dst[dst_index], val); + + frac += dst_incr_frac; + index += dst_incr; + if(frac >= c->src_incr){ + frac -= c->src_incr; + index++; + } + + if(dst_index + 1 == compensation_distance){ + compensation_distance= 0; + dst_incr_frac= c->ideal_dst_incr % c->src_incr; + dst_incr= c->ideal_dst_incr / c->src_incr; + } + } + *consumed= FFMAX(sample_index, 0); + index += FFMIN(sample_index, 0) << c->phase_shift; + + if(compensation_distance){ + compensation_distance -= dst_index; + av_assert1(compensation_distance > 0); + } + } + + if(update_ctx){ + c->frac= frac; + c->index= index; + c->dst_incr= dst_incr_frac + c->src_incr*dst_incr; + c->compensation_distance= compensation_distance; + } + + return dst_index; +} + +#undef COMMON_CORE +#undef RENAME +#undef FILTER_SHIFT +#undef DELEM +#undef FELEM +#undef FELEM2 +#undef FELEML +#undef FELEM_MAX +#undef FELEM_MIN +#undef OUT |