| /* |
| * This file is part of libswresample |
| * |
| * libswresample is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * libswresample is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with libswresample; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #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 |