Handle sample-accurate panning by AudioParam automation.
| 44 | |
| 45 | // Handle sample-accurate panning by AudioParam automation. |
| 46 | virtual void panWithSampleAccurateValues(const AudioBus * inputBus, AudioBus * outputBus, const float * panValues, int framesToProcess) |
| 47 | { |
| 48 | size_t numberOfInputChannels = inputBus->numberOfChannels(); |
| 49 | |
| 50 | bool isInputSafe = inputBus && (inputBus->numberOfChannels() == Channels::Mono || |
| 51 | inputBus->numberOfChannels() == Channels::Stereo) && framesToProcess <= inputBus->length(); |
| 52 | |
| 53 | ASSERT(isInputSafe); |
| 54 | |
| 55 | if (!isInputSafe) |
| 56 | return; |
| 57 | |
| 58 | bool isOutputSafe = outputBus && outputBus->numberOfChannels() == Channels::Stereo && framesToProcess <= outputBus->length(); |
| 59 | |
| 60 | ASSERT(isOutputSafe); |
| 61 | |
| 62 | if (!isOutputSafe) |
| 63 | return; |
| 64 | |
| 65 | const float * sourceL = inputBus->channel(0)->data(); |
| 66 | const float * sourceR = numberOfInputChannels > Channels::Mono ? inputBus->channel(1)->data() : sourceL; |
| 67 | |
| 68 | float * destinationL = outputBus->channelByType(Channel::Left)->mutableData(); |
| 69 | float * destinationR = outputBus->channelByType(Channel::Right)->mutableData(); |
| 70 | |
| 71 | if (!sourceL || !sourceR || !destinationL || !destinationR) |
| 72 | return; |
| 73 | |
| 74 | double gainL, gainR, panRadian; |
| 75 | size_t n = framesToProcess; |
| 76 | |
| 77 | // For mono source case. |
| 78 | if (numberOfInputChannels == Channels::Mono) |
| 79 | { |
| 80 | while (n--) |
| 81 | { |
| 82 | float inputL = *sourceL++; |
| 83 | |
| 84 | m_pan = clampTo(*panValues++, -1.0, 1.0); |
| 85 | |
| 86 | // Pan from left to right [-1; 1] will be normalized as [0; 1]. |
| 87 | panRadian = (m_pan * 0.5 + 0.5) * LAB_HALF_PI; |
| 88 | |
| 89 | gainL = std::cos(panRadian); |
| 90 | gainR = std::sin(panRadian); |
| 91 | |
| 92 | *destinationL++ = static_cast<float>(inputL * gainL); |
| 93 | *destinationR++ = static_cast<float>(inputL * gainR); |
| 94 | } |
| 95 | } |
| 96 | // For stereo source case. |
| 97 | else |
| 98 | { |
| 99 | while (n--) |
| 100 | { |
| 101 | float inputL = *sourceL++; |
| 102 | float inputR = *sourceR++; |
| 103 |
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