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audio: getFreePlayhead()

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minjaesong
2026-06-07 02:21:21 +09:00
parent 3444bdf63b
commit aa45c2194f
11 changed files with 124 additions and 81 deletions
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22
assets/disk0/tvdos/bin/playmp2.js
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@@ -57,13 +57,17 @@ let decodedLength = 0
const bufRealTimeLen = 36 // one MP2 frame at 32 kHz ≈ 36 ms
audio.resetParams(0)
audio.purgeQueue(0)
audio.setPcmMode(0)
audio.setPcmQueueCapacityIndex(0, 2)
const QUEUE_MAX = audio.getPcmQueueCapacity(0)
audio.setMasterVolume(0, 255)
audio.play(0)
// Occupy the first idle playhead rather than always grabbing #0, so playback
// doesn't cut off audio already running on another playhead. Falls back to #0
// when all four are busy.
const PLAYHEAD = audio.getFreePlayhead(0)
audio.resetParams(PLAYHEAD)
audio.purgeQueue(PLAYHEAD)
audio.setPcmMode(PLAYHEAD)
audio.setPcmQueueCapacityIndex(PLAYHEAD, 2)
const QUEUE_MAX = audio.getPcmQueueCapacity(PLAYHEAD)
audio.setMasterVolume(PLAYHEAD, 255)
audio.play(PLAYHEAD)
audio.mp2Init()
function bytesToSec(i) { return i / (FRAME_SIZE * 1000 / bufRealTimeLen) }
@@ -91,8 +95,8 @@ try {
gui.audioFeedPcm(mp2VisScratch, MP2_VIS_SAMPLE_COUNT)
}
if (audio.getPosition(0) >= QUEUE_MAX) {
while (audio.getPosition(0) >= (QUEUE_MAX >>> 1)) {
if (audio.getPosition(PLAYHEAD) >= QUEUE_MAX) {
while (audio.getPosition(PLAYHEAD) >= (QUEUE_MAX >>> 1)) {
if (interactive) gui.audioRender()
sys.sleep(bufRealTimeLen)
}