Glenn Kasten | 632e0c0 | 2011-12-16 10:42:58 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include <audio_utils/primitives.h> |
| 18 | |
Glenn Kasten | 7ef795a | 2013-07-17 07:25:05 -0700 | [diff] [blame] | 19 | void ditherAndClamp(int32_t* out, const int32_t *sums, size_t c) |
Glenn Kasten | 632e0c0 | 2011-12-16 10:42:58 -0800 | [diff] [blame] | 20 | { |
| 21 | size_t i; |
| 22 | for (i=0 ; i<c ; i++) { |
| 23 | int32_t l = *sums++; |
| 24 | int32_t r = *sums++; |
| 25 | int32_t nl = l >> 12; |
| 26 | int32_t nr = r >> 12; |
| 27 | l = clamp16(nl); |
| 28 | r = clamp16(nr); |
| 29 | *out++ = (r<<16) | (l & 0xFFFF); |
| 30 | } |
| 31 | } |
Glenn Kasten | ddb2e93 | 2012-01-16 13:21:31 -0800 | [diff] [blame] | 32 | |
| 33 | void memcpy_to_i16_from_u8(int16_t *dst, const uint8_t *src, size_t count) |
| 34 | { |
| 35 | dst += count; |
| 36 | src += count; |
| 37 | while (count--) { |
| 38 | *--dst = (int16_t)(*--src - 0x80) << 8; |
| 39 | } |
| 40 | } |
Glenn Kasten | 7a0baca | 2012-07-19 13:59:50 -0700 | [diff] [blame] | 41 | |
Glenn Kasten | 78da2ac | 2012-11-12 14:39:36 -0800 | [diff] [blame] | 42 | void memcpy_to_u8_from_i16(uint8_t *dst, const int16_t *src, size_t count) |
| 43 | { |
| 44 | while (count--) { |
| 45 | *dst++ = (*src++ >> 8) + 0x80; |
| 46 | } |
| 47 | } |
| 48 | |
Glenn Kasten | 5d43605 | 2013-06-21 14:01:54 -0700 | [diff] [blame] | 49 | void memcpy_to_i16_from_i32(int16_t *dst, const int32_t *src, size_t count) |
| 50 | { |
| 51 | while (count--) { |
| 52 | *dst++ = *src++ >> 16; |
| 53 | } |
| 54 | } |
| 55 | |
| 56 | void memcpy_to_i16_from_float(int16_t *dst, const float *src, size_t count) |
| 57 | { |
| 58 | while (count--) { |
| 59 | float f = *src++; |
| 60 | int16_t i; |
| 61 | if (f > 1.0) { |
| 62 | i = 32767; |
| 63 | } else if (f < -1.0) { |
| 64 | i = -32768; |
| 65 | } else { |
| 66 | // does not specifically handle NaN |
| 67 | i = f * 32767.0; |
| 68 | } |
| 69 | *dst++ = i; |
| 70 | } |
| 71 | } |
| 72 | |
Glenn Kasten | 7a0baca | 2012-07-19 13:59:50 -0700 | [diff] [blame] | 73 | void downmix_to_mono_i16_from_stereo_i16(int16_t *dst, const int16_t *src, size_t count) |
| 74 | { |
| 75 | while (count--) { |
| 76 | *dst++ = (int16_t)(((int32_t)src[0] + (int32_t)src[1]) >> 1); |
| 77 | src += 2; |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | void upmix_to_stereo_i16_from_mono_i16(int16_t *dst, const int16_t *src, size_t count) |
| 82 | { |
| 83 | while (count--) { |
| 84 | int32_t temp = *src++; |
| 85 | dst[0] = temp; |
| 86 | dst[1] = temp; |
| 87 | dst += 2; |
| 88 | } |
| 89 | } |
Glenn Kasten | eb247df | 2014-02-21 10:00:51 -0800 | [diff] [blame^] | 90 | |
| 91 | size_t nonZeroMono32(const int32_t *samples, size_t count) |
| 92 | { |
| 93 | size_t nonZero = 0; |
| 94 | while (count-- > 0) { |
| 95 | if (*samples++ != 0) { |
| 96 | nonZero++; |
| 97 | } |
| 98 | } |
| 99 | return nonZero; |
| 100 | } |
| 101 | |
| 102 | size_t nonZeroMono16(const int16_t *samples, size_t count) |
| 103 | { |
| 104 | size_t nonZero = 0; |
| 105 | while (count-- > 0) { |
| 106 | if (*samples++ != 0) { |
| 107 | nonZero++; |
| 108 | } |
| 109 | } |
| 110 | return nonZero; |
| 111 | } |
| 112 | |
| 113 | size_t nonZeroStereo32(const int32_t *frames, size_t count) |
| 114 | { |
| 115 | size_t nonZero = 0; |
| 116 | while (count-- > 0) { |
| 117 | if (frames[0] != 0 || frames[1] != 0) { |
| 118 | nonZero++; |
| 119 | } |
| 120 | frames += 2; |
| 121 | } |
| 122 | return nonZero; |
| 123 | } |
| 124 | |
| 125 | size_t nonZeroStereo16(const int16_t *frames, size_t count) |
| 126 | { |
| 127 | size_t nonZero = 0; |
| 128 | while (count-- > 0) { |
| 129 | if (frames[0] != 0 || frames[1] != 0) { |
| 130 | nonZero++; |
| 131 | } |
| 132 | frames += 2; |
| 133 | } |
| 134 | return nonZero; |
| 135 | } |