19 #if defined(TEMPLATE_DITHER_DBL)
20 # define RENAME(N) N ## _double
22 # define CLIP(v) while(0)
24 #elif defined(TEMPLATE_DITHER_FLT)
25 # define RENAME(N) N ## _float
27 # define CLIP(v) while(0)
29 #elif defined(TEMPLATE_DITHER_S32)
30 # define RENAME(N) N ## _int32
31 # define DELEM int32_t
32 # define CLIP(v) v = FFMAX(FFMIN(v, INT32_MAX), INT32_MIN)
34 #elif defined(TEMPLATE_DITHER_S16)
35 # define RENAME(N) N ## _int16
36 # define DELEM int16_t
37 # define CLIP(v) v = FFMAX(FFMIN(v, INT16_MAX), INT16_MIN)
44 int pos =
s->dither.ns_pos;
46 int taps =
s->dither.ns_taps;
47 float S =
s->dither.ns_scale;
48 float S_1 =
s->dither.ns_scale_1;
51 av_assert2((taps&3) != 3 ||
s->dither.ns_coeffs[taps] == 0);
53 for (ch=0; ch<srcs->ch_count; ch++) {
54 const float *
noise = ((
const float *)noises->ch[ch]) +
s->dither.noise_pos;
55 const DELEM *
src = (
const DELEM*)srcs->ch[ch];
56 DELEM *dst = (DELEM*)dsts->ch[ch];
57 float *ns_errors =
s->dither.ns_errors[ch];
58 const float *ns_coeffs =
s->dither.ns_coeffs;
59 pos =
s->dither.ns_pos;
60 for (
i=0;
i<count;
i++) {
61 double d1, d =
src[
i]*S_1;
62 for(j=0; j<taps-2; j+=4) {
63 d -= ns_coeffs[j ] * ns_errors[
pos + j ]
64 +ns_coeffs[j + 1] * ns_errors[
pos + j + 1]
65 +ns_coeffs[j + 2] * ns_errors[
pos + j + 2]
66 +ns_coeffs[j + 3] * ns_errors[
pos + j + 3];
69 d -= ns_coeffs[j] * ns_errors[
pos + j];
72 ns_errors[
pos + taps] = ns_errors[
pos] = d1 - d;
79 s->dither.ns_pos =
pos;
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
ERROR void RENAME() swri_noise_shaping(SwrContext *s, AudioData *dsts, const AudioData *srcs, const AudioData *noises, int count)
static int noise(AVBSFContext *ctx, AVPacket *pkt)
Audio buffer used for intermediate storage between conversion phases.
The libswresample context.
static void ERROR(const char *str)