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LibAudio+LibDSP: Switch samples to 32-bit float instead of 64-bit float
This has been overkill from the start, and it has been bugging me for a long time. With this change, we're probably a bit slower on most platforms but save huge amounts of space with all in-memory sample datastructures.
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16 changed files with 329 additions and 329 deletions
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@ -15,9 +15,9 @@ using AK::Exponentials::exp;
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using AK::Exponentials::log;
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// Constants for logarithmic volume. See Sample::linear_to_log
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// Corresponds to 60dB
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constexpr double DYNAMIC_RANGE = 1000;
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constexpr double VOLUME_A = 1 / DYNAMIC_RANGE;
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double const VOLUME_B = log(DYNAMIC_RANGE);
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constexpr float DYNAMIC_RANGE = 1000;
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constexpr float VOLUME_A = 1 / DYNAMIC_RANGE;
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float const VOLUME_B = log(DYNAMIC_RANGE);
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// A single sample in an audio buffer.
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// Values are floating point, and should range from -1.0 to +1.0
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@ -25,14 +25,14 @@ struct Sample {
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constexpr Sample() = default;
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// For mono
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constexpr explicit Sample(double left)
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constexpr explicit Sample(float left)
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: left(left)
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, right(left)
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{
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}
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// For stereo
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constexpr Sample(double left, double right)
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constexpr Sample(float left, float right)
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: left(left)
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, right(right)
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{
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@ -65,27 +65,27 @@ struct Sample {
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// - Linear: 0.0 to 1.0
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// - Logarithmic: 0.0 to 1.0
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ALWAYS_INLINE double linear_to_log(double const change) const
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ALWAYS_INLINE float linear_to_log(float const change) const
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{
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// TODO: Add linear slope around 0
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return VOLUME_A * exp(VOLUME_B * change);
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}
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ALWAYS_INLINE double log_to_linear(double const val) const
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ALWAYS_INLINE float log_to_linear(float const val) const
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{
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// TODO: Add linear slope around 0
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return log(val / VOLUME_A) / VOLUME_B;
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}
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ALWAYS_INLINE Sample& log_multiply(double const change)
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ALWAYS_INLINE Sample& log_multiply(float const change)
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{
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double factor = linear_to_log(change);
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float factor = linear_to_log(change);
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left *= factor;
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right *= factor;
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return *this;
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}
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ALWAYS_INLINE Sample log_multiplied(double const volume_change) const
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ALWAYS_INLINE Sample log_multiplied(float const volume_change) const
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{
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Sample new_frame { left, right };
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new_frame.log_multiply(volume_change);
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@ -93,33 +93,33 @@ struct Sample {
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}
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// Constant power panning
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ALWAYS_INLINE Sample& pan(double const position)
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ALWAYS_INLINE Sample& pan(float const position)
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{
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double const pi_over_2 = AK::Pi<double> * 0.5;
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double const root_over_2 = AK::sqrt(2.0) * 0.5;
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double const angle = position * pi_over_2 * 0.5;
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double s, c;
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AK::sincos(angle, s, c);
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float const pi_over_2 = AK::Pi<float> * 0.5f;
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float const root_over_2 = AK::sqrt<float>(2.0) * 0.5f;
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float const angle = position * pi_over_2 * 0.5f;
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float s, c;
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AK::sincos<float>(angle, s, c);
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left *= root_over_2 * (c - s);
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right *= root_over_2 * (c + s);
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return *this;
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}
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ALWAYS_INLINE Sample panned(double const position) const
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ALWAYS_INLINE Sample panned(float const position) const
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{
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Sample new_sample { left, right };
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new_sample.pan(position);
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return new_sample;
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}
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constexpr Sample& operator*=(double const mult)
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constexpr Sample& operator*=(float const mult)
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{
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left *= mult;
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right *= mult;
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return *this;
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}
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constexpr Sample operator*(double const mult) const
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constexpr Sample operator*(float const mult) const
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{
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return { left * mult, right * mult };
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}
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@ -130,7 +130,7 @@ struct Sample {
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right += other.right;
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return *this;
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}
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constexpr Sample& operator+=(double other)
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constexpr Sample& operator+=(float other)
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{
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left += other;
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right += other;
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@ -142,8 +142,8 @@ struct Sample {
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return { left + other.left, right + other.right };
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}
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double left { 0 };
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double right { 0 };
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float left { 0 };
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float right { 0 };
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};
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}
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