mirror of https://git.ffmpeg.org/ffmpeg.git
68 lines
2.0 KiB
C
68 lines
2.0 KiB
C
|
|
#if defined(TEMPLATE_DITHER_DBL)
|
|
# define RENAME(N) N ## _double
|
|
# define DELEM double
|
|
# define CLIP(v) while(0)
|
|
|
|
#elif defined(TEMPLATE_DITHER_FLT)
|
|
# define RENAME(N) N ## _float
|
|
# define DELEM float
|
|
# define CLIP(v) while(0)
|
|
|
|
#elif defined(TEMPLATE_DITHER_S32)
|
|
# define RENAME(N) N ## _int32
|
|
# define DELEM int32_t
|
|
# define CLIP(v) v = FFMAX(FFMIN(v, INT32_MAX), INT32_MIN)
|
|
|
|
#elif defined(TEMPLATE_DITHER_S16)
|
|
# define RENAME(N) N ## _int16
|
|
# define DELEM int16_t
|
|
# define CLIP(v) v = FFMAX(FFMIN(v, INT16_MAX), INT16_MIN)
|
|
|
|
#else
|
|
ERROR
|
|
#endif
|
|
|
|
void RENAME(swri_noise_shaping)(SwrContext *s, AudioData *dsts, const AudioData *srcs, const AudioData *noises, int count){
|
|
int pos = s->dither.ns_pos;
|
|
int i, j, ch;
|
|
int taps = s->dither.ns_taps;
|
|
float S = s->dither.ns_scale;
|
|
float S_1 = s->dither.ns_scale_1;
|
|
|
|
av_assert2((taps&3) != 2);
|
|
av_assert2((taps&3) != 3 || s->dither.ns_coeffs[taps] == 0);
|
|
|
|
for (ch=0; ch<srcs->ch_count; ch++) {
|
|
const float *noise = ((const float *)noises->ch[ch]) + s->dither.noise_pos;
|
|
const DELEM *src = (const DELEM*)srcs->ch[ch];
|
|
DELEM *dst = (DELEM*)dsts->ch[ch];
|
|
float *ns_errors = s->dither.ns_errors[ch];
|
|
const float *ns_coeffs = s->dither.ns_coeffs;
|
|
pos = s->dither.ns_pos;
|
|
for (i=0; i<count; i++) {
|
|
double d1, d = src[i]*S_1;
|
|
for(j=0; j<taps-2; j+=4) {
|
|
d -= ns_coeffs[j ] * ns_errors[pos + j ]
|
|
+ns_coeffs[j + 1] * ns_errors[pos + j + 1]
|
|
+ns_coeffs[j + 2] * ns_errors[pos + j + 2]
|
|
+ns_coeffs[j + 3] * ns_errors[pos + j + 3];
|
|
}
|
|
if(j < taps)
|
|
d -= ns_coeffs[j] * ns_errors[pos + j];
|
|
pos = pos ? pos - 1 : taps - 1;
|
|
d1 = rint(d + noise[i]);
|
|
ns_errors[pos + taps] = ns_errors[pos] = d1 - d;
|
|
d1 *= S;
|
|
CLIP(d1);
|
|
dst[i] = d1;
|
|
}
|
|
}
|
|
|
|
s->dither.ns_pos = pos;
|
|
}
|
|
|
|
#undef RENAME
|
|
#undef DELEM
|
|
#undef CLIP
|