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resample: split linear into its own function

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This commit is contained in:
Anton Khirnov 2014-03-04 17:12:33 +01:00
parent be394968c8
commit 254c95cdd1
2 changed files with 27 additions and 15 deletions
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8
libavresample/resample.c
View File

@ -181,22 +181,22 @@ ResampleContext *ff_audio_resample_init(AVAudioResampleContext *avr)
switch (avr->internal_sample_fmt) {
case AV_SAMPLE_FMT_DBLP:
c->resample_one = resample_one_dbl;
c->resample_one = c->linear ? resample_linear_dbl : resample_one_dbl;
c->resample_nearest = resample_nearest_dbl;
c->set_filter = set_filter_dbl;
break;
case AV_SAMPLE_FMT_FLTP:
c->resample_one = resample_one_flt;
c->resample_one = c->linear ? resample_linear_flt : resample_one_flt;
c->resample_nearest = resample_nearest_flt;
c->set_filter = set_filter_flt;
break;
case AV_SAMPLE_FMT_S32P:
c->resample_one = resample_one_s32;
c->resample_one = c->linear ? resample_linear_s32 : resample_one_s32;
c->resample_nearest = resample_nearest_s32;
c->set_filter = set_filter_s32;
break;
case AV_SAMPLE_FMT_S16P:
c->resample_one = resample_one_s16;
c->resample_one = c->linear ? resample_linear_s16 : resample_one_s16;
c->resample_nearest = resample_nearest_s16;
c->set_filter = set_filter_s16;
break;

34
libavresample/resample_template.c
View File

@ -61,6 +61,27 @@ static void SET_TYPE(resample_nearest)(void *dst0, int dst_index, const void *sr
dst[dst_index] = src[index];
}
static void SET_TYPE(resample_linear)(ResampleContext *c, void *dst0, int dst_index,
const void *src0, unsigned int index, int frac)
{
FELEM *dst = dst0;
const FELEM *src = src0;
int i;
unsigned int sample_index = index >> c->phase_shift;
FELEM2 val = 0;
FELEM *filter = ((FELEM *)c->filter_bank) +
c->filter_length * (index & c->phase_mask);
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_length];
}
val += (v2 - val) * (FELEML)frac / c->src_incr;
OUT(dst[dst_index], val);
}
static void SET_TYPE(resample_one)(ResampleContext *c,
void *dst0, int dst_index, const void *src0,
unsigned int index, int frac)
@ -73,17 +94,8 @@ static void SET_TYPE(resample_one)(ResampleContext *c,
FELEM *filter = ((FELEM *)c->filter_bank) +
c->filter_length * (index & c->phase_mask);
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_length];
}
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];
}
for (i = 0; i < c->filter_length; i++)
val += src[sample_index + i] * (FELEM2)filter[i];
OUT(dst[dst_index], val);
}