mirror of https://github.com/adamdruppe/arsd.git
balance setting for left/right tones
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Adam D. Ruppe
parent
f89d4c5d21
commit
81b927a4ac
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@ -41,6 +41,8 @@
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*/
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module arsd.simpleaudio;
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// http://webcache.googleusercontent.com/search?q=cache:NqveBqL0AOUJ:https://www.alsa-project.org/alsa-doc/alsa-lib/group___p_c_m.html&hl=en&gl=us&strip=1&vwsrc=0
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version(without_resampler) {
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} else {
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@ -478,35 +480,52 @@ final class AudioPcmOutThreadImplementation : Thread {
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}
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}
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/// Args in hertz and milliseconds
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/++
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Makes some old-school style sound effects. Play with them to see what they actually sound like.
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Params:
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freq = frequency of the wave in hertz
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dur = duration in milliseconds
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volume = amplitude of the wave, between 0 and 100
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balance = stereo balance. 50 = both speakers equally, 0 = all to the left, none to the right, 100 = all to the right, none to the left.
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attack = a parameter to the change of frequency
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freqBase = the base frequency in the sound effect algorithm
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History:
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The `balance` argument was added on December 13, 2021 (dub v10.5)
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+/
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@scriptable
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void beep(int freq = 900, int dur = 150, int volume = DEFAULT_VOLUME) {
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void beep(int freq = 900, int dur = 150, int volume = DEFAULT_VOLUME, int balance = 50) {
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Sample s;
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s.operation = 0; // square wave
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s.frequency = SampleRate / freq;
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s.duration = dur * SampleRate / 1000;
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s.volume = volume;
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s.balance = balance;
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addSample(s);
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}
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///
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/// ditto
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@scriptable
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void noise(int dur = 150, int volume = DEFAULT_VOLUME) {
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void noise(int dur = 150, int volume = DEFAULT_VOLUME, int balance = 50) {
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Sample s;
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s.operation = 1; // noise
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s.frequency = 0;
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s.volume = volume;
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s.duration = dur * SampleRate / 1000;
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s.balance = balance;
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addSample(s);
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}
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///
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/// ditto
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@scriptable
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void boop(float attack = 8, int freqBase = 500, int dur = 150, int volume = DEFAULT_VOLUME) {
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void boop(float attack = 8, int freqBase = 500, int dur = 150, int volume = DEFAULT_VOLUME, int balance = 50) {
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Sample s;
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s.operation = 5; // custom
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s.volume = volume;
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s.duration = dur * SampleRate / 1000;
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s.balance = balance;
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s.f = delegate short(int x) {
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auto currentFrequency = cast(float) freqBase / (1 + cast(float) x / (cast(float) SampleRate / attack));
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import std.math;
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@ -516,13 +535,14 @@ final class AudioPcmOutThreadImplementation : Thread {
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addSample(s);
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}
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///
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/// ditto
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@scriptable
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void blip(float attack = 6, int freqBase = 800, int dur = 150, int volume = DEFAULT_VOLUME) {
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void blip(float attack = 6, int freqBase = 800, int dur = 150, int volume = DEFAULT_VOLUME, int balance = 50) {
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Sample s;
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s.operation = 5; // custom
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s.volume = volume;
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s.duration = dur * SampleRate / 1000;
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s.balance = balance;
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s.f = delegate short(int x) {
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auto currentFrequency = cast(float) freqBase * (1 + cast(float) x / (cast(float) SampleRate / attack));
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import std.math;
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@ -993,6 +1013,7 @@ final class AudioPcmOutThreadImplementation : Thread {
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int duration; /* in samples */
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int volume; /* between 1 and 100. You should generally shoot for something lowish, like 20. */
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int delay; /* in samples */
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int balance = 50; /* between 0 and 100 */
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int x;
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short delegate(int x) f;
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@ -1001,6 +1022,12 @@ final class AudioPcmOutThreadImplementation : Thread {
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final void addSample(Sample currentSample) {
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int frequencyCounter;
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short val = cast(short) (cast(int) short.max * currentSample.volume / 100);
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enum divisor = 50;
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int leftMultiplier = 50 + (50 - currentSample.balance);
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int rightMultiplier = 50 + (currentSample.balance - 50);
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bool left = true;
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addChannel(
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delegate bool (short[] buffer) {
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if(currentSample.duration) {
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@ -1031,7 +1058,8 @@ final class AudioPcmOutThreadImplementation : Thread {
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switch(currentSample.operation) {
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case 0: // square wave
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for(; i < sampleFinish; i++) {
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buffer[i] = val;
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buffer[i] = cast(short)((val * (left ? leftMultiplier : rightMultiplier)) / divisor);
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left = !left;
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// left and right do the same thing so we only count
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// every other sample
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if(i & 1) {
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@ -1048,7 +1076,8 @@ final class AudioPcmOutThreadImplementation : Thread {
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case 1: // noise
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for(; i < sampleFinish; i++) {
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import std.random;
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buffer[i] = uniform(cast(short) -cast(int)val, val);
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buffer[i] = cast(short)((left ? leftMultiplier : rightMultiplier) * uniform(cast(short) -cast(int)val, val) / divisor);
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left = !left;
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}
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break;
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/+
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@ -1130,7 +1159,8 @@ final class AudioPcmOutThreadImplementation : Thread {
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case 5: // custom function
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val = currentSample.f(currentSample.x);
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for(; i < sampleFinish; i++) {
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buffer[i] = val;
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buffer[i] = cast(short)(val * (left ? leftMultiplier : rightMultiplier) / divisor);
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left = !left;
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if(i & 1) {
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currentSample.x++;
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val = currentSample.f(currentSample.x);
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