| /* |
| * Audio resampling |
| * |
| * Copyright (c) 2004-2012 Michael Niedermayer <michaelni@gmx.at> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg 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. |
| * |
| * FFmpeg 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 FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "config.h" |
| |
| #include "libavutil/cpu.h" |
| #include "libavutil/avassert.h" |
| |
| #include "libavutil/arm/cpu.h" |
| #include "libswresample/resample.h" |
| |
| #define DECLARE_RESAMPLE_COMMON_TEMPLATE(TYPE, DELEM, FELEM, FELEM2, OUT) \ |
| \ |
| void ff_resample_common_apply_filter_x4_##TYPE##_neon(FELEM2 *acc, const DELEM *src, \ |
| const FELEM *filter, int length); \ |
| \ |
| void ff_resample_common_apply_filter_x8_##TYPE##_neon(FELEM2 *acc, const DELEM *src, \ |
| const FELEM *filter, int length); \ |
| \ |
| static int ff_resample_common_##TYPE##_neon(ResampleContext *c, void *dest, const void *source, \ |
| int n, int update_ctx) \ |
| { \ |
| DELEM *dst = dest; \ |
| const DELEM *src = source; \ |
| int dst_index; \ |
| int index = c->index; \ |
| int frac = c->frac; \ |
| int sample_index = 0; \ |
| int x4_aligned_filter_length = c->filter_length & ~3; \ |
| int x8_aligned_filter_length = c->filter_length & ~7; \ |
| \ |
| while (index >= c->phase_count) { \ |
| sample_index++; \ |
| index -= c->phase_count; \ |
| } \ |
| \ |
| for (dst_index = 0; dst_index < n; dst_index++) { \ |
| FELEM *filter = ((FELEM *) c->filter_bank) + c->filter_alloc * index; \ |
| \ |
| FELEM2 val = 0; \ |
| int i = 0; \ |
| if (x8_aligned_filter_length >= 8) { \ |
| ff_resample_common_apply_filter_x8_##TYPE##_neon(&val, &src[sample_index], \ |
| filter, x8_aligned_filter_length); \ |
| i += x8_aligned_filter_length; \ |
| \ |
| } else if (x4_aligned_filter_length >= 4) { \ |
| ff_resample_common_apply_filter_x4_##TYPE##_neon(&val, &src[sample_index], \ |
| filter, x4_aligned_filter_length); \ |
| i += x4_aligned_filter_length; \ |
| } \ |
| for (; i < c->filter_length; i++) { \ |
| val += src[sample_index + i] * (FELEM2)filter[i]; \ |
| } \ |
| OUT(dst[dst_index], val); \ |
| \ |
| frac += c->dst_incr_mod; \ |
| index += c->dst_incr_div; \ |
| if (frac >= c->src_incr) { \ |
| frac -= c->src_incr; \ |
| index++; \ |
| } \ |
| \ |
| while (index >= c->phase_count) { \ |
| sample_index++; \ |
| index -= c->phase_count; \ |
| } \ |
| } \ |
| \ |
| if (update_ctx) { \ |
| c->frac = frac; \ |
| c->index = index; \ |
| } \ |
| \ |
| return sample_index; \ |
| } \ |
| |
| #define OUT(d, v) d = v |
| DECLARE_RESAMPLE_COMMON_TEMPLATE(float, float, float, float, OUT) |
| #undef OUT |
| |
| #define OUT(d, v) (v) = ((v) + (1<<(14)))>>15; (d) = av_clip_int16(v) |
| DECLARE_RESAMPLE_COMMON_TEMPLATE(s16, int16_t, int16_t, int32_t, OUT) |
| #undef OUT |
| |
| av_cold void swri_resample_dsp_arm_init(ResampleContext *c) |
| { |
| int cpu_flags = av_get_cpu_flags(); |
| |
| if (!have_neon(cpu_flags)) |
| return; |
| |
| switch(c->format) { |
| case AV_SAMPLE_FMT_FLTP: |
| c->dsp.resample_common = ff_resample_common_float_neon; |
| break; |
| case AV_SAMPLE_FMT_S16P: |
| c->dsp.resample_common = ff_resample_common_s16_neon; |
| break; |
| } |
| } |