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resample: split the nearest neighbour path into a separate function pointer

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This commit is contained in:
Anton Khirnov 2014-03-03 22:26:57 +01:00
parent b9dea23766
commit f20892eb67
2 changed files with 25 additions and 13 deletions
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25
libavresample/resample.c
View File

@ -44,9 +44,11 @@ struct ResampleContext {
int kaiser_beta;
double factor;
void (*set_filter)(void *filter, double *tab, int phase, int tap_count);
void (*resample_one)(struct ResampleContext *c, int no_filter, void *dst0,
void (*resample_one)(struct ResampleContext *c, void *dst0,
int dst_index, const void *src0, int src_size,
int index, int frac);
void (*resample_nearest)(void *dst0, int dst_index,
const void *src0, int index);
int padding_size;
};
@ -178,18 +180,22 @@ 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_nearest = resample_nearest_dbl;
c->set_filter = set_filter_dbl;
break;
case AV_SAMPLE_FMT_FLTP:
c->resample_one = 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_nearest = resample_nearest_s32;
c->set_filter = set_filter_s32;
break;
case AV_SAMPLE_FMT_S16P:
c->resample_one = resample_one_s16;
c->resample_nearest = resample_nearest_s16;
c->set_filter = set_filter_s16;
break;
}
@ -332,7 +338,8 @@ reinit_fail:
}
static int resample(ResampleContext *c, void *dst, const void *src,
int *consumed, int src_size, int dst_size, int update_ctx)
int *consumed, int src_size, int dst_size, int update_ctx,
int nearest_neighbour)
{
int dst_index;
int index = c->index;
@ -344,8 +351,7 @@ static int resample(ResampleContext *c, void *dst, const void *src,
if (!dst != !src)
return AVERROR(EINVAL);
if (compensation_distance == 0 && c->filter_length == 1 &&
c->phase_shift == 0) {
if (nearest_neighbour) {
int64_t index2 = ((int64_t)index) << 32;
int64_t incr = (1LL << 32) * c->dst_incr / c->src_incr;
dst_size = FFMIN(dst_size,
@ -354,7 +360,7 @@ static int resample(ResampleContext *c, void *dst, const void *src,
if (dst) {
for(dst_index = 0; dst_index < dst_size; dst_index++) {
c->resample_one(c, 1, dst, dst_index, src, 0, index2 >> 32, 0);
c->resample_nearest(dst, dst_index, src, index2 >> 32);
index2 += incr;
}
} else {
@ -372,7 +378,7 @@ static int resample(ResampleContext *c, void *dst, const void *src,
break;
if (dst)
c->resample_one(c, 0, dst, dst_index, src, src_size, index, frac);
c->resample_one(c, dst, dst_index, src, src_size, index, frac);
frac += dst_incr_frac;
index += dst_incr;
@ -412,6 +418,9 @@ int ff_audio_resample(ResampleContext *c, AudioData *dst, AudioData *src)
{
int ch, in_samples, in_leftover, consumed = 0, out_samples = 0;
int ret = AVERROR(EINVAL);
int nearest_neighbour = (c->compensation_distance == 0 &&
c->filter_length == 1 &&
c->phase_shift == 0);
in_samples = src ? src->nb_samples : 0;
in_leftover = c->buffer->nb_samples;
@ -432,7 +441,7 @@ int ff_audio_resample(ResampleContext *c, AudioData *dst, AudioData *src)
/* TODO: try to calculate this without the dummy resample() run */
if (!dst->read_only && dst->allow_realloc) {
out_samples = resample(c, NULL, NULL, NULL, c->buffer->nb_samples,
INT_MAX, 0);
INT_MAX, 0, nearest_neighbour);
ret = ff_audio_data_realloc(dst, out_samples);
if (ret < 0) {
av_log(c->avr, AV_LOG_ERROR, "error reallocating output\n");
@ -445,7 +454,7 @@ int ff_audio_resample(ResampleContext *c, AudioData *dst, AudioData *src)
out_samples = resample(c, (void *)dst->data[ch],
(const void *)c->buffer->data[ch], &consumed,
c->buffer->nb_samples, dst->allocated_samples,
ch + 1 == c->buffer->channels);
ch + 1 == c->buffer->channels, nearest_neighbour);
}
if (out_samples < 0) {
av_log(c->avr, AV_LOG_ERROR, "error during resampling\n");

13
libavresample/resample_template.c
View File

@ -54,16 +54,20 @@
#define DBL_TO_FELEM(d, v) d = av_clip_int16(lrint(v * (1 << 15)))
#endif
static void SET_TYPE(resample_one)(ResampleContext *c, int no_filter,
static void SET_TYPE(resample_nearest)(void *dst0, int dst_index, const void *src0, int index)
{
FELEM *dst = dst0;
const FELEM *src = src0;
dst[dst_index] = src[index];
}
static void SET_TYPE(resample_one)(ResampleContext *c,
void *dst0, int dst_index, const void *src0,
int src_size, int index, int frac)
{
FELEM *dst = dst0;
const FELEM *src = src0;
if (no_filter) {
dst[dst_index] = src[index];
} else {
int i;
int sample_index = index >> c->phase_shift;
FELEM2 val = 0;
@ -87,7 +91,6 @@ static void SET_TYPE(resample_one)(ResampleContext *c, int no_filter,
}
OUT(dst[dst_index], val);
}
}
static void SET_TYPE(set_filter)(void *filter0, double *tab, int phase,