1 /* 2 * audio resampling 3 * Copyright (c) 2004-2012 Michael Niedermayer <michaelni@gmx.at> 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22 #ifndef SWRESAMPLE_RESAMPLE_H 23 #define SWRESAMPLE_RESAMPLE_H 24 25 #include "libavutil/log.h" 26 #include "libavutil/samplefmt.h" 27 28 #include "swresample_internal.h" 29 30 typedef struct ResampleContext { 31 const AVClass *av_class; 32 uint8_t *filter_bank; 33 int filter_length; 34 int filter_alloc; 35 int ideal_dst_incr; 36 int dst_incr; 37 int dst_incr_div; 38 int dst_incr_mod; 39 int index; 40 int frac; 41 int src_incr; 42 int compensation_distance; 43 int phase_count; 44 int linear; 45 enum SwrFilterType filter_type; 46 double kaiser_beta; 47 double factor; 48 enum AVSampleFormat format; 49 int felem_size; 50 int filter_shift; 51 int phase_count_compensation; /* desired phase_count when compensation is enabled */ 52 53 struct { 54 void (*resample_one)(void *dst, const void *src, 55 int n, int64_t index, int64_t incr); 56 int (*resample_common)(struct ResampleContext *c, void *dst, 57 const void *src, int n, int update_ctx); 58 int (*resample_linear)(struct ResampleContext *c, void *dst, 59 const void *src, int n, int update_ctx); 60 } dsp; 61 } ResampleContext; 62 63 void swri_resample_dsp_init(ResampleContext *c); 64 void swri_resample_dsp_x86_init(ResampleContext *c); 65 void swri_resample_dsp_arm_init(ResampleContext *c); 66 void swri_resample_dsp_aarch64_init(ResampleContext *c); 67 68 #endif /* SWRESAMPLE_RESAMPLE_H */ 69