snapshot

packages/core/controls.mjs

@@ -193,16 +193,33 @@ const generic_params = [
    */
   ['end'],
   /**
-   * Loops the sample (from `begin` to `end`) the specified number of times.
-   * Note that the tempo of the loop is not synced with the cycle tempo.
+   * Loops the sample from `loopBegin` to `loopEnd`. If one or both of those are set,
+   * the sample is looped to fill the event duration, instead of playing the whole sample.
+   * If only `loopBegin` is set, `loopEnd` defaults to 1.
+   * If only `loopEnd` is set, `loopBegin` defaults to 0.
    *
-   * @name loop
-   * @param {number | Pattern} times How often the sample is looped
+   * @name loopBegin
+   * @param {number | Pattern} position position from 0 - 1 where the loop starts
    * @example
-   * s("bd").loop("<1 2 3 4>").osc()
+   * note("<c a f e>").s("piano")
+   * .loopBegin("<0 .24 .32>").loopEnd(.5)
    *
    */
-  ['loop'],
+  ['loopBegin'],
+  /**
+   * Loops the sample from `loopBegin` to `loopEnd`. If one or both of those are set,
+   * the sample is looped to fill the event duration, instead of playing the whole sample.
+   * If only `loopBegin` is set, `loopEnd` defaults to 1.
+   * If only `loopEnd` is set, `loopBegin` defaults to 0.
+   *
+   * @name loopEnd
+   * @param {number | Pattern} position position from 0 - 1 where the loop ends
+   * @example
+   * note("<c a f e>").s("piano")
+   * .loopBegin(.2).loopEnd("<.3 .4 .5 .6>")
+   *
+   */
+  ['loopEnd'],
   // TODO: currently duplicated with "native" legato
   // TODO: superdirt legato will do more: https://youtu.be/dQPmE1WaD1k?t=419
   /**

packages/webaudio/webaudio.mjs

@@ -231,7 +231,8 @@ export const webaudioOutput = async (hap, deadline, hapDuration, cps) => {
     unit,
     nudge = 0, // TODO: is this in seconds?
     cut,
-    loop,
+    loopBegin,
+    loopEnd,
     orbit = 1,
     room,
     size = 2,
@@ -307,17 +308,21 @@ export const webaudioOutput = async (hap, deadline, hapDuration, cps) => {
       // are there other units?
       bufferSource.playbackRate.value = bufferSource.playbackRate.value * bufferSource.buffer.duration * cps;
     }
-    let duration = soundfont || clip ? hapDuration : bufferSource.buffer.duration / bufferSource.playbackRate.value;
+    const loop = loopBegin !== undefined || loopEnd !== undefined;
+    let duration =
+      soundfont || clip || loop ? hapDuration : bufferSource.buffer.duration / bufferSource.playbackRate.value;
     // "The computation of the offset into the sound is performed using the sound buffer's natural sample rate,
     // rather than the current playback rate, so even if the sound is playing at twice its normal speed,
     // the midway point through a 10-second audio buffer is still 5."
     const offset = begin * duration * bufferSource.playbackRate.value;
     duration = (end - begin) * duration;
     if (loop) {
+      loopBegin = loopBegin ?? 0;
+      loopEnd = loopEnd ?? 1;
       bufferSource.loop = true;
-      bufferSource.loopStart = offset;
-      bufferSource.loopEnd = offset + duration;
-      duration = loop * duration;
+      bufferSource.loopStart = offset + loopBegin * duration;
+      bufferSource.loopEnd = offset + duration - (1 - loopEnd) * duration;
+      duration = hapDuration;
     }
     t += nudge;
 

test/__snapshots__/examples.test.mjs.snap

@@ -2354,15 +2354,6 @@ exports[`runs examples > example "linger" example index 0 1`] = `
 ]
 `;
 
-exports[`runs examples > example "loop" example index 0 1`] = `
-[
-  "[ 0/1 → 1/1 | s:bd loop:1 ]",
-  "[ 1/1 → 2/1 | s:bd loop:2 ]",
-  "[ 2/1 → 3/1 | s:bd loop:3 ]",
-  "[ 3/1 → 4/1 | s:bd loop:4 ]",
-]
-`;
-
 exports[`runs examples > example "loopAt" example index 0 1`] = `
 [
   "[ (0/1 → 1/1) ⇝ 4/1 | s:rhodes speed:0.25 unit:c ]",
@@ -2381,6 +2372,24 @@ exports[`runs examples > example "loopAtCps" example index 0 1`] = `
 ]
 `;
 
+exports[`runs examples > example "loopBegin" example index 0 1`] = `
+[
+  "[ 0/1 → 1/1 | note:c s:piano loopBegin:0 loopEnd:0.5 ]",
+  "[ 1/1 → 2/1 | note:a s:piano loopBegin:0.24 loopEnd:0.5 ]",
+  "[ 2/1 → 3/1 | note:f s:piano loopBegin:0.32 loopEnd:0.5 ]",
+  "[ 3/1 → 4/1 | note:e s:piano loopBegin:0 loopEnd:0.5 ]",
+]
+`;
+
+exports[`runs examples > example "loopEnd" example index 0 1`] = `
+[
+  "[ 0/1 → 1/1 | note:c s:piano loopBegin:0.2 loopEnd:0.3 ]",
+  "[ 1/1 → 2/1 | note:a s:piano loopBegin:0.2 loopEnd:0.4 ]",
+  "[ 2/1 → 3/1 | note:f s:piano loopBegin:0.2 loopEnd:0.5 ]",
+  "[ 3/1 → 4/1 | note:e s:piano loopBegin:0.2 loopEnd:0.6 ]",
+]
+`;
+
 exports[`runs examples > example "lpf" example index 0 1`] = `
 [
   "[ 0/1 → 1/2 | s:bd cutoff:4000 ]",