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AUDIOPHILE_KIDDY_MODE

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Originally committed as revision 8475 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2007-03-22 03:16:02 +00:00
parent 50df67d3b5
commit 55fc0eb174
1 changed files with 21 additions and 5 deletions
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26
libavcodec/resample2.c
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@ -35,17 +35,26 @@
#define FELEM int16_t
#define FELEM2 int32_t
#define FELEML int64_t
#define FELEM_MAX INT16_MAX
#define FELEM_MIN INT16_MIN
#define WINDOW_TYPE 9
#else
#elif !defined(CONFIG_RESAMPLE_AUDIOPHILE_KIDDY_MODE)
#define FILTER_SHIFT 30
#define FELEM int32_t
#define FELEM2 int64_t
#define FELEML int64_t
#define FELEM_MAX INT32_MAX
#define FELEM_MIN INT32_MIN
#define WINDOW_TYPE 12
#else
#define FILTER_SHIFT 0
#define FELEM long double
#define FELEM2 long double
#define FELEML long double
#define WINDOW_TYPE 24
#endif
@ -123,8 +132,11 @@ void av_build_filter(FELEM *filter, double factor, int tap_count, int phase_coun
/* normalize so that an uniform color remains the same */
for(i=0;i<tap_count;i++) {
v = av_clip(lrintf(tab[i] * scale / norm), FELEM_MIN, FELEM_MAX);
filter[ph * tap_count + i] = v;
#ifdef CONFIG_RESAMPLE_AUDIOPHILE_KIDDY_MODE
filter[ph * tap_count + i] = tab[i] / norm;
#else
filter[ph * tap_count + i] = av_clip(lrintf(tab[i] * scale / norm), FELEM_MIN, FELEM_MAX);
#endif
}
}
#if 0
@ -156,7 +168,7 @@ void av_build_filter(FELEM *filter, double factor, int tap_count, int phase_coun
maxsf= FFMAX(maxsf, sf);
minsf= FFMIN(minsf, sf);
if(i%11==0){
av_log(NULL, AV_LOG_ERROR, "i:%4d ss:%f ff:%f-%f sf:%f-%f\n", i, ss, maxff, minff, maxsf, minsf);
av_log(NULL, AV_LOG_ERROR, "i:%4d ss:%f ff:%13.6e-%13.6e sf:%13.6e-%13.6e\n", i, ss, maxff, minff, maxsf, minsf);
minff=minsf= 2;
maxff=maxsf= -2;
}
@ -259,7 +271,7 @@ int av_resample(AVResampleContext *c, short *dst, short *src, int *consumed, int
int64_t v=0;
int sub_phase= (frac<<8) / c->src_incr;
for(i=0; i<c->filter_length; i++){
int64_t coeff= filter[i]*(256 - sub_phase) + filter[i + c->filter_length]*sub_phase;
FELEML coeff= filter[i]*(256 - sub_phase) + filter[i + c->filter_length]*sub_phase;
v += src[sample_index + i] * coeff;
}
val= v>>8;
@ -269,8 +281,12 @@ int av_resample(AVResampleContext *c, short *dst, short *src, int *consumed, int
}
}
#ifdef CONFIG_RESAMPLE_AUDIOPHILE_KIDDY_MODE
dst[dst_index] = av_clip(lrintf(val), -32768, 32767);
#else
val = (val + (1<<(FILTER_SHIFT-1)))>>FILTER_SHIFT;
dst[dst_index] = (unsigned)(val + 32768) > 65535 ? (val>>31) ^ 32767 : val;
#endif
frac += dst_incr_frac;
index += dst_incr;