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Use cubic mapping for volume control (#6020)
* Use cubic mapping for volume control * Update comment for hardware volume slider
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@ -84,11 +84,11 @@ void DspInterface::OutputCallback(s16* buffer, std::size_t num_frames) {
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std::memcpy(buffer + 2 * i, &last_frame[0], 2 * sizeof(s16));
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}
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// Implementation of the hardware volume slider with a dynamic range of 60 dB
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// Implementation of the hardware volume slider
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// A cubic curve is used to approximate a linear change in human-perceived loudness
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const float linear_volume = std::clamp(Settings::values.volume, 0.0f, 1.0f);
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if (linear_volume != 1.0) {
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const float volume_scale_factor =
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linear_volume == 0 ? 0 : std::exp(6.90775f * linear_volume) * 0.001f;
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const float volume_scale_factor = linear_volume * linear_volume * linear_volume;
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for (std::size_t i = 0; i < num_frames; i++) {
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buffer[i * 2 + 0] = static_cast<s16>(buffer[i * 2 + 0] * volume_scale_factor);
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buffer[i * 2 + 1] = static_cast<s16>(buffer[i * 2 + 1] * volume_scale_factor);
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