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1 /* | 1 /* |
2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license | 4 * Use of this source code is governed by a BSD-style license |
5 * that can be found in the LICENSE file in the root of the source | 5 * that can be found in the LICENSE file in the root of the source |
6 * tree. An additional intellectual property rights grant can be found | 6 * tree. An additional intellectual property rights grant can be found |
7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
9 */ | 9 */ |
10 | 10 |
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92 MonoToStereo(data_copy, frame->samples_per_channel_, frame->data_); | 92 MonoToStereo(data_copy, frame->samples_per_channel_, frame->data_); |
93 frame->num_channels_ = 2; | 93 frame->num_channels_ = 2; |
94 | 94 |
95 return 0; | 95 return 0; |
96 } | 96 } |
97 | 97 |
98 void AudioFrameOperations::StereoToMono(const int16_t* src_audio, | 98 void AudioFrameOperations::StereoToMono(const int16_t* src_audio, |
99 size_t samples_per_channel, | 99 size_t samples_per_channel, |
100 int16_t* dst_audio) { | 100 int16_t* dst_audio) { |
101 for (size_t i = 0; i < samples_per_channel; i++) { | 101 for (size_t i = 0; i < samples_per_channel; i++) { |
102 dst_audio[i] = (src_audio[2 * i] + src_audio[2 * i + 1]) >> 1; | 102 dst_audio[i] = |
| 103 (static_cast<int32_t>(src_audio[2 * i]) + src_audio[2 * i + 1]) >> 1; |
103 } | 104 } |
104 } | 105 } |
105 | 106 |
106 int AudioFrameOperations::StereoToMono(AudioFrame* frame) { | 107 int AudioFrameOperations::StereoToMono(AudioFrame* frame) { |
107 if (frame->num_channels_ != 2) { | 108 if (frame->num_channels_ != 2) { |
108 return -1; | 109 return -1; |
109 } | 110 } |
110 | 111 |
| 112 RTC_DCHECK_LE(frame->samples_per_channel_ * 2, |
| 113 AudioFrame::kMaxDataSizeSamples); |
| 114 |
111 StereoToMono(frame->data_, frame->samples_per_channel_, frame->data_); | 115 StereoToMono(frame->data_, frame->samples_per_channel_, frame->data_); |
112 frame->num_channels_ = 1; | 116 frame->num_channels_ = 1; |
113 | 117 |
114 return 0; | 118 return 0; |
115 } | 119 } |
116 | 120 |
| 121 void AudioFrameOperations::QuadToStereo(const int16_t* src_audio, |
| 122 size_t samples_per_channel, |
| 123 int16_t* dst_audio) { |
| 124 for (size_t i = 0; i < samples_per_channel; i++) { |
| 125 dst_audio[i * 2] = |
| 126 (static_cast<int32_t>(src_audio[4 * i]) + src_audio[4 * i + 1]) >> 1; |
| 127 dst_audio[i * 2 + 1] = |
| 128 (static_cast<int32_t>(src_audio[4 * i + 2]) + src_audio[4 * i + 3]) >> |
| 129 1; |
| 130 } |
| 131 } |
| 132 |
| 133 int AudioFrameOperations::QuadToStereo(AudioFrame* frame) { |
| 134 if (frame->num_channels_ != 4) { |
| 135 return -1; |
| 136 } |
| 137 |
| 138 RTC_DCHECK_LE(frame->samples_per_channel_ * 4, |
| 139 AudioFrame::kMaxDataSizeSamples); |
| 140 |
| 141 QuadToStereo(frame->data_, frame->samples_per_channel_, frame->data_); |
| 142 frame->num_channels_ = 2; |
| 143 |
| 144 return 0; |
| 145 } |
| 146 |
| 147 void AudioFrameOperations::QuadToMono(const int16_t* src_audio, |
| 148 size_t samples_per_channel, |
| 149 int16_t* dst_audio) { |
| 150 for (size_t i = 0; i < samples_per_channel; i++) { |
| 151 dst_audio[i] = |
| 152 (static_cast<int32_t>(src_audio[4 * i]) + src_audio[4 * i + 1] + |
| 153 src_audio[4 * i + 2] + src_audio[4 * i + 3]) >> 2; |
| 154 } |
| 155 } |
| 156 |
| 157 int AudioFrameOperations::QuadToMono(AudioFrame* frame) { |
| 158 if (frame->num_channels_ != 4) { |
| 159 return -1; |
| 160 } |
| 161 |
| 162 RTC_DCHECK_LE(frame->samples_per_channel_ * 4, |
| 163 AudioFrame::kMaxDataSizeSamples); |
| 164 |
| 165 QuadToMono(frame->data_, frame->samples_per_channel_, frame->data_); |
| 166 frame->num_channels_ = 1; |
| 167 |
| 168 return 0; |
| 169 } |
| 170 |
| 171 void AudioFrameOperations::DownmixChannels(const int16_t* src_audio, |
| 172 size_t src_channels, |
| 173 size_t samples_per_channel, |
| 174 size_t dst_channels, |
| 175 int16_t* dst_audio) { |
| 176 if (src_channels == 2 && dst_channels == 1) { |
| 177 StereoToMono(src_audio, samples_per_channel, dst_audio); |
| 178 return; |
| 179 } else if (src_channels == 4 && dst_channels == 2) { |
| 180 QuadToStereo(src_audio, samples_per_channel, dst_audio); |
| 181 return; |
| 182 } else if (src_channels == 4 && dst_channels == 1) { |
| 183 QuadToMono(src_audio, samples_per_channel, dst_audio); |
| 184 return; |
| 185 } |
| 186 |
| 187 RTC_NOTREACHED() << "src_channels: " << src_channels |
| 188 << ", dst_channels: " << dst_channels; |
| 189 } |
| 190 |
| 191 int AudioFrameOperations::DownmixChannels(size_t dst_channels, |
| 192 AudioFrame* frame) { |
| 193 if (frame->num_channels_ == 2 && dst_channels == 1) { |
| 194 return StereoToMono(frame); |
| 195 } else if (frame->num_channels_ == 4 && dst_channels == 2) { |
| 196 return QuadToStereo(frame); |
| 197 } else if (frame->num_channels_ == 4 && dst_channels == 1) { |
| 198 return QuadToMono(frame); |
| 199 } |
| 200 |
| 201 return -1; |
| 202 } |
| 203 |
117 void AudioFrameOperations::SwapStereoChannels(AudioFrame* frame) { | 204 void AudioFrameOperations::SwapStereoChannels(AudioFrame* frame) { |
118 RTC_DCHECK(frame); | 205 RTC_DCHECK(frame); |
119 if (frame->num_channels_ != 2) { | 206 if (frame->num_channels_ != 2) { |
120 return; | 207 return; |
121 } | 208 } |
122 | 209 |
123 for (size_t i = 0; i < frame->samples_per_channel_ * 2; i += 2) { | 210 for (size_t i = 0; i < frame->samples_per_channel_ * 2; i += 2) { |
124 int16_t temp_data = frame->data_[i]; | 211 int16_t temp_data = frame->data_[i]; |
125 frame->data_[i] = frame->data_[i + 1]; | 212 frame->data_[i] = frame->data_[i + 1]; |
126 frame->data_[i + 1] = temp_data; | 213 frame->data_[i + 1] = temp_data; |
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217 frame.data_[i] = -32768; | 304 frame.data_[i] = -32768; |
218 } else if (temp_data > 32767) { | 305 } else if (temp_data > 32767) { |
219 frame.data_[i] = 32767; | 306 frame.data_[i] = 32767; |
220 } else { | 307 } else { |
221 frame.data_[i] = static_cast<int16_t>(temp_data); | 308 frame.data_[i] = static_cast<int16_t>(temp_data); |
222 } | 309 } |
223 } | 310 } |
224 return 0; | 311 return 0; |
225 } | 312 } |
226 } // namespace webrtc | 313 } // namespace webrtc |
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