| 1 | /* |
| 2 | * Copyright (c) 2012 |
| 3 | * MIPS Technologies, Inc., California. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * 3. Neither the name of the MIPS Technologies, Inc., nor the names of its |
| 14 | * contributors may be used to endorse or promote products derived from |
| 15 | * this software without specific prior written permission. |
| 16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND |
| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE |
| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 27 | * SUCH DAMAGE. |
| 28 | * |
| 29 | * Author: Nedeljko Babic (nbabic@mips.com) |
| 30 | * |
| 31 | * This file is part of FFmpeg. |
| 32 | * |
| 33 | * FFmpeg is free software; you can redistribute it and/or |
| 34 | * modify it under the terms of the GNU Lesser General Public |
| 35 | * License as published by the Free Software Foundation; either |
| 36 | * version 2.1 of the License, or (at your option) any later version. |
| 37 | * |
| 38 | * FFmpeg is distributed in the hope that it will be useful, |
| 39 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 40 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 41 | * Lesser General Public License for more details. |
| 42 | * |
| 43 | * You should have received a copy of the GNU Lesser General Public |
| 44 | * License along with FFmpeg; if not, write to the Free Software |
| 45 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 46 | */ |
| 47 | |
| 48 | #include "fixed_dsp.h" |
| 49 | |
| 50 | static void vector_fmul_window_fixed_scaled_c(int16_t *dst, const int32_t *src0, |
| 51 | const int32_t *src1, const int32_t *win, |
| 52 | int len, uint8_t bits) |
| 53 | { |
| 54 | int32_t s0, s1, wi, wj, i,j, round; |
| 55 | |
| 56 | dst += len; |
| 57 | win += len; |
| 58 | src0+= len; |
| 59 | round = bits? 1 << (bits-1) : 0; |
| 60 | |
| 61 | for (i=-len, j=len-1; i<0; i++, j--) { |
| 62 | s0 = src0[i]; |
| 63 | s1 = src1[j]; |
| 64 | wi = win[i]; |
| 65 | wj = win[j]; |
| 66 | dst[i] = av_clip_int16_c(((((int64_t)s0*wj - (int64_t)s1*wi + 0x40000000) >> 31) + round) >> bits); |
| 67 | dst[j] = av_clip_int16_c(((((int64_t)s0*wi + (int64_t)s1*wj + 0x40000000) >> 31) + round) >> bits); |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | static void vector_fmul_window_fixed_c(int32_t *dst, const int32_t *src0, |
| 72 | const int32_t *src1, const int32_t *win, |
| 73 | int len) |
| 74 | { |
| 75 | int32_t s0, s1, wi, wj, i, j; |
| 76 | |
| 77 | dst += len; |
| 78 | win += len; |
| 79 | src0+= len; |
| 80 | |
| 81 | for (i=-len, j=len-1; i<0; i++, j--) { |
| 82 | s0 = src0[i]; |
| 83 | s1 = src1[j]; |
| 84 | wi = win[i]; |
| 85 | wj = win[j]; |
| 86 | dst[i] = ((int64_t)s0*wj - (int64_t)s1*wi + 0x40000000) >> 31; |
| 87 | dst[j] = ((int64_t)s0*wi + (int64_t)s1*wj + 0x40000000) >> 31; |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | AVFixedDSPContext * avpriv_alloc_fixed_dsp(int bit_exact) |
| 92 | { |
| 93 | AVFixedDSPContext * fdsp = av_malloc(sizeof(AVFixedDSPContext)); |
| 94 | fdsp->vector_fmul_window_scaled = vector_fmul_window_fixed_scaled_c; |
| 95 | fdsp->vector_fmul_window = vector_fmul_window_fixed_c; |
| 96 | |
| 97 | return fdsp; |
| 98 | } |