mirror of https://github.com/FFmpeg/FFmpeg.git
Based partially on implementation by Michael Niedermayer <michaelni@gmx.at> in libswresample in FFmpeg. See commits:pull/59/head7f1ae79d3824ab1abfb6
Justin Ruggles
13 years ago
parent
372647aed0
commit
6410397600
3 changed files with 199 additions and 88 deletions
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/*
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* Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at> |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#if defined(CONFIG_RESAMPLE_DBL) |
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#define SET_TYPE(func) func ## _dbl |
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#define FELEM double |
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#define FELEM2 double |
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#define FELEML double |
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#define OUT(d, v) d = v |
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#define DBL_TO_FELEM(d, v) d = v |
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#elif defined(CONFIG_RESAMPLE_FLT) |
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#define SET_TYPE(func) func ## _flt |
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#define FELEM float |
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#define FELEM2 float |
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#define FELEML float |
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#define OUT(d, v) d = v |
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#define DBL_TO_FELEM(d, v) d = v |
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#elif defined(CONFIG_RESAMPLE_S32) |
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#define SET_TYPE(func) func ## _s32 |
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#define FELEM int32_t |
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#define FELEM2 int64_t |
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#define FELEML int64_t |
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#define OUT(d, v) d = av_clipl_int32((v + (1 << 29)) >> 30) |
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#define DBL_TO_FELEM(d, v) d = av_clipl_int32(llrint(v * (1 << 30))); |
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#else |
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#define SET_TYPE(func) func ## _s16 |
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#define FELEM int16_t |
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#define FELEM2 int32_t |
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#define FELEML int64_t |
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#define OUT(d, v) d = av_clip_int16((v + (1 << 14)) >> 15) |
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#define DBL_TO_FELEM(d, v) d = av_clip_int16(lrint(v * (1 << 15))) |
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#endif |
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static void SET_TYPE(resample_one)(ResampleContext *c, int no_filter, |
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void *dst0, int dst_index, const void *src0, |
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int src_size, int index, int frac) |
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{ |
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FELEM *dst = dst0; |
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const FELEM *src = src0; |
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if (no_filter) { |
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dst[dst_index] = src[index]; |
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} else { |
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int i; |
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int sample_index = index >> c->phase_shift; |
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FELEM2 val = 0; |
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FELEM *filter = ((FELEM *)c->filter_bank) + |
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c->filter_length * (index & c->phase_mask); |
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if (sample_index < 0) { |
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for (i = 0; i < c->filter_length; i++) |
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val += src[FFABS(sample_index + i) % src_size] * |
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(FELEM2)filter[i]; |
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} else if (c->linear) { |
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FELEM2 v2 = 0; |
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for (i = 0; i < c->filter_length; i++) { |
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val += src[abs(sample_index + i)] * (FELEM2)filter[i]; |
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v2 += src[abs(sample_index + i)] * (FELEM2)filter[i + c->filter_length]; |
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} |
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val += (v2 - val) * (FELEML)frac / c->src_incr; |
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} else { |
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for (i = 0; i < c->filter_length; i++) |
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val += src[sample_index + i] * (FELEM2)filter[i]; |
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} |
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OUT(dst[dst_index], val); |
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} |
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} |
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static void SET_TYPE(set_filter)(void *filter0, double *tab, int phase, |
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int tap_count) |
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{ |
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int i; |
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FELEM *filter = ((FELEM *)filter0) + phase * tap_count; |
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for (i = 0; i < tap_count; i++) { |
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DBL_TO_FELEM(filter[i], tab[i]); |
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} |
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} |
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#undef SET_TYPE |
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#undef FELEM |
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#undef FELEM2 |
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#undef FELEML |
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#undef OUT |
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#undef DBL_TO_FELEM |
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