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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "chromecast/media/cma/backend/alsa/slew_volume.h" | 5 #include "chromecast/media/cma/backend/alsa/slew_volume.h" |
6 | 6 |
7 #include <algorithm> | 7 #include <algorithm> |
8 | 8 |
9 #include "base/logging.h" | 9 #include "base/logging.h" |
10 #include "media/base/vector_math.h" | 10 #include "media/base/vector_math.h" |
11 | 11 |
12 namespace { | 12 namespace { |
13 | 13 |
14 // The time to slew from current volume to target volume. | 14 // The time to slew from current volume to target volume. |
15 const int kMaxSlewTimeMs = 100; | 15 const int kMaxSlewTimeMs = 100; |
16 const int kDefaultSampleRate = 44100; | 16 const int kDefaultSampleRate = 44100; |
17 } | 17 |
18 } // namespace | |
18 | 19 |
19 namespace chromecast { | 20 namespace chromecast { |
20 namespace media { | 21 namespace media { |
21 | 22 |
22 SlewVolume::SlewVolume() : SlewVolume(kMaxSlewTimeMs) {} | 23 SlewVolume::SlewVolume() : SlewVolume(kMaxSlewTimeMs) {} |
23 | 24 |
24 SlewVolume::SlewVolume(int max_slew_time_ms) | 25 SlewVolume::SlewVolume(int max_slew_time_ms) |
25 : sample_rate_(kDefaultSampleRate), | 26 : sample_rate_(kDefaultSampleRate), |
26 max_slew_time_ms_(max_slew_time_ms), | 27 max_slew_time_ms_(max_slew_time_ms), |
27 max_slew_per_sample_(1000.0 / (max_slew_time_ms_ * sample_rate_)) { | 28 max_slew_per_sample_(1000.0 / (max_slew_time_ms_ * sample_rate_)) {} |
28 LOG(INFO) << "Creating a slew volume: " << max_slew_time_ms; | |
29 } | |
30 | 29 |
31 void SlewVolume::SetSampleRate(int sample_rate) { | 30 void SlewVolume::SetSampleRate(int sample_rate) { |
31 DCHECK_GT(sample_rate, 0); | |
32 | |
32 sample_rate_ = sample_rate; | 33 sample_rate_ = sample_rate; |
33 SetVolume(volume_scale_); | 34 SetVolume(volume_scale_); |
34 } | 35 } |
35 | 36 |
36 // Slew rate should be volume_to_slew / slew_time / sample_rate | 37 // Slew rate should be volume_to_slew / slew_time / sample_rate |
37 void SlewVolume::SetVolume(double volume_scale) { | 38 void SlewVolume::SetVolume(double volume_scale) { |
38 volume_scale_ = volume_scale; | 39 volume_scale_ = volume_scale; |
39 if (interrupted_) { | 40 if (interrupted_) { |
40 current_volume_ = volume_scale_; | 41 current_volume_ = volume_scale_; |
41 } | 42 } |
42 if (volume_scale_ > current_volume_) { | 43 if (volume_scale_ > current_volume_) { |
43 max_slew_per_sample_ = (volume_scale_ - current_volume_) * 1000.0 / | 44 max_slew_per_sample_ = (volume_scale_ - current_volume_) * 1000.0 / |
44 (max_slew_time_ms_ * sample_rate_); | 45 (max_slew_time_ms_ * sample_rate_); |
45 } else { | 46 } else { |
46 max_slew_per_sample_ = (current_volume_ - volume_scale_) * 1000.0 / | 47 max_slew_per_sample_ = (current_volume_ - volume_scale_) * 1000.0 / |
47 (max_slew_time_ms_ * sample_rate_); | 48 (max_slew_time_ms_ * sample_rate_); |
48 } | 49 } |
49 } | 50 } |
50 | 51 |
51 void SlewVolume::SetMaxSlewTimeMs(int max_slew_time_ms) { | 52 void SlewVolume::SetMaxSlewTimeMs(int max_slew_time_ms) { |
53 DCHECK_GE(max_slew_time_ms, 0); | |
54 | |
52 max_slew_time_ms_ = max_slew_time_ms; | 55 max_slew_time_ms_ = max_slew_time_ms; |
53 } | 56 } |
54 | 57 |
55 void SlewVolume::Interrupted() { | 58 void SlewVolume::Interrupted() { |
56 interrupted_ = true; | 59 interrupted_ = true; |
57 current_volume_ = volume_scale_; | 60 current_volume_ = volume_scale_; |
58 } | 61 } |
59 | 62 |
60 void SlewVolume::ProcessFMAC(bool repeat_transition, | 63 void SlewVolume::ProcessFMAC(bool repeat_transition, |
61 const float* src, | 64 const float* src, |
(...skipping 17 matching lines...) Expand all Loading... | |
79 } else { | 82 } else { |
80 last_starting_volume_ = current_volume_; | 83 last_starting_volume_ = current_volume_; |
81 } | 84 } |
82 | 85 |
83 if (current_volume_ == volume_scale_) { | 86 if (current_volume_ == volume_scale_) { |
84 if (current_volume_ == 0.0) { | 87 if (current_volume_ == 0.0) { |
85 return; | 88 return; |
86 } | 89 } |
87 ::media::vector_math::FMAC(src, current_volume_, frames, dest); | 90 ::media::vector_math::FMAC(src, current_volume_, frames, dest); |
88 return; | 91 return; |
89 } else if (current_volume_ < volume_scale_) { | 92 } |
93 | |
94 if (current_volume_ < volume_scale_) { | |
90 do { | 95 do { |
91 (*dest) += (*src) * current_volume_; | 96 (*dest) += (*src) * current_volume_; |
92 ++src; | 97 ++src; |
93 ++dest; | 98 ++dest; |
94 --frames; | 99 --frames; |
95 current_volume_ += max_slew_per_sample_; | 100 current_volume_ += max_slew_per_sample_; |
96 } while (current_volume_ < volume_scale_ && frames); | 101 } while (current_volume_ < volume_scale_ && frames); |
97 current_volume_ = std::min(current_volume_, volume_scale_); | 102 current_volume_ = std::min(current_volume_, volume_scale_); |
98 } else { // current_volume_ > volume_scale_ | 103 } else { // current_volume_ > volume_scale_ |
99 do { | 104 do { |
100 (*dest) += (*src) * current_volume_; | 105 (*dest) += (*src) * current_volume_; |
101 ++src; | 106 ++src; |
102 ++dest; | 107 ++dest; |
103 --frames; | 108 --frames; |
104 current_volume_ -= max_slew_per_sample_; | 109 current_volume_ -= max_slew_per_sample_; |
105 } while (current_volume_ > volume_scale_ && frames); | 110 } while (current_volume_ > volume_scale_ && frames); |
106 current_volume_ = std::max(current_volume_, volume_scale_); | 111 current_volume_ = std::max(current_volume_, volume_scale_); |
107 } | 112 } |
108 | 113 while (frames && (reinterpret_cast<uintptr_t>(src) & |
109 if (frames) { | 114 (::media::vector_math::kRequiredAlignment - 1))) { |
110 for (int f = 0; f < frames; ++f) { | 115 (*dest) += (*src) * current_volume_; |
111 dest[f] += src[f] * current_volume_; | 116 ++src; |
112 } | 117 ++dest; |
118 --frames; | |
113 } | 119 } |
120 if (!frames) { | |
121 return; | |
122 } | |
123 ::media::vector_math::FMAC(src, current_volume_, frames, dest); | |
114 } | 124 } |
115 | 125 |
116 // Scaling samples naively like this takes 0.2% of the CPU's time @ 44100hz | 126 void SlewVolume::ProcessFMUL(bool repeat_transition, |
117 // on pineapple. | 127 const float* src, |
118 // Assumes 2 channel audio. | 128 int frames, |
119 bool SlewVolume::ProcessInterleaved(int32_t* data, int frames) { | 129 float* dest) { |
120 DCHECK(data); | 130 DCHECK(src); |
131 DCHECK(dest); | |
132 // Ensure |src| and |dest| are 16-byte aligned. | |
133 DCHECK_EQ(0u, reinterpret_cast<uintptr_t>(src) & | |
134 (::media::vector_math::kRequiredAlignment - 1)); | |
135 DCHECK_EQ(0u, reinterpret_cast<uintptr_t>(dest) & | |
136 (::media::vector_math::kRequiredAlignment - 1)); | |
121 | 137 |
122 if (!frames) { | 138 if (!frames) { |
123 return true; | 139 return; |
124 } | 140 } |
125 | 141 |
126 interrupted_ = false; | 142 interrupted_ = false; |
143 if (repeat_transition) { | |
144 current_volume_ = last_starting_volume_; | |
145 } else { | |
146 last_starting_volume_ = current_volume_; | |
147 } | |
kmackay
2017/05/04 18:29:34
Can this common code (between FMAC and FMUL) be mo
bshaya
2017/05/04 23:53:38
Done.
| |
148 | |
127 if (current_volume_ == volume_scale_) { | 149 if (current_volume_ == volume_scale_) { |
150 if (current_volume_ == 0.0) { | |
151 memset(dest, 0, frames * sizeof(*dest)); | |
152 return; | |
153 } | |
128 if (current_volume_ == 1.0) { | 154 if (current_volume_ == 1.0) { |
129 return true; | 155 if (src == dest) { |
156 return; | |
157 } | |
158 std::memcpy(dest, src, frames * sizeof(*dest)); | |
159 return; | |
130 } | 160 } |
131 for (int i = 0; i < 2 * frames; ++i) { | 161 ::media::vector_math::FMUL(src, current_volume_, frames, dest); |
132 data[i] *= current_volume_; | 162 return; |
133 } | 163 } |
134 return true; | 164 |
135 } else if (current_volume_ < volume_scale_) { | 165 LOG(INFO) << "max slew per sample " << max_slew_per_sample_; |
166 if (current_volume_ < volume_scale_) { | |
136 do { | 167 do { |
137 (*data) *= current_volume_; | 168 (*dest) = (*src) * current_volume_; |
138 ++data; | 169 ++src; |
139 (*data) *= current_volume_; | 170 ++dest; |
140 ++data; | |
141 --frames; | 171 --frames; |
142 current_volume_ += max_slew_per_sample_; | 172 current_volume_ += max_slew_per_sample_; |
143 } while (current_volume_ < volume_scale_ && frames); | 173 } while (current_volume_ < volume_scale_ && frames); |
144 current_volume_ = std::min(current_volume_, volume_scale_); | 174 current_volume_ = std::min(current_volume_, volume_scale_); |
145 } else { | 175 } else { // current_volume_ > volume_scale_ |
146 do { | 176 do { |
147 (*data) *= current_volume_; | 177 (*dest) = (*src) * current_volume_; |
148 ++data; | 178 ++src; |
149 (*data) *= current_volume_; | 179 ++dest; |
150 ++data; | |
151 --frames; | 180 --frames; |
152 current_volume_ -= max_slew_per_sample_; | 181 current_volume_ -= max_slew_per_sample_; |
153 } while (current_volume_ > volume_scale_ && frames); | 182 } while (current_volume_ > volume_scale_ && frames); |
154 current_volume_ = std::max(current_volume_, volume_scale_); | 183 current_volume_ = std::max(current_volume_, volume_scale_); |
155 } | 184 } |
156 | 185 |
157 if (current_volume_ == 1.0) { | 186 while (frames && (reinterpret_cast<uintptr_t>(src) & |
158 return true; | 187 (::media::vector_math::kRequiredAlignment - 1))) { |
188 (*dest) = (*src) * current_volume_; | |
189 ++src; | |
190 ++dest; | |
191 --frames; | |
159 } | 192 } |
160 | 193 if (!frames) { |
161 if (current_volume_ == 0.0) { | 194 return; |
162 std::fill_n(data, frames * 2, 0); | |
163 return true; | |
164 } | 195 } |
165 | 196 ::media::vector_math::FMUL(src, current_volume_, frames, dest); |
166 for (int i = 0; i < 2 * frames; ++i) { | |
167 data[i] *= current_volume_; | |
168 } | |
169 return true; | |
170 } | 197 } |
171 | 198 |
172 } // namespace media | 199 } // namespace media |
173 } // namespace chromecast | 200 } // namespace chromecast |
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