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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/playwav.js
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@@ -131,16 +131,20 @@ try {
readPtr = sys.malloc(pcmType === 2 ? BLOCK_SIZE : BLOCK_SIZE * bitsPerSample / 8)
decodePtr = sys.malloc(BLOCK_SIZE * pcm.HW_SAMPLING_RATE / samplingRate)
audio.resetParams(0)
audio.purgeQueue(0)
audio.setPcmMode(0)
audio.setMasterVolume(0, 255)
// 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.setMasterVolume(PLAYHEAD, 255)
let readLength = 1
while (!stopPlay && seqread.getReadCount() < startOffset + chunkSize && readLength > 0) {
if (interactive && gui.audioIsExitRequested()) { stopPlay = true; break }
if (audio.getPosition(0) <= 1) {
if (audio.getPosition(PLAYHEAD) <= 1) {
for (let repeat = 0; repeat < QUEUE_MAX; repeat++) {
const remainingBytes = FILE_SIZE - 8 - seqread.getReadCount()
readLength = (remainingBytes < INFILE_BLOCK_SIZE) ? remainingBytes : INFILE_BLOCK_SIZE
@@ -153,13 +157,13 @@ try {
// before queueing — the buffer is reused next iteration.
if (interactive) gui.audioFeedPcm(decodePtr, decodedSampleLength >> 1)
audio.putPcmDataByPtr(0, decodePtr, decodedSampleLength, 0)
audio.setSampleUploadLength(0, decodedSampleLength)
audio.startSampleUpload(0)
audio.putPcmDataByPtr(PLAYHEAD, decodePtr, decodedSampleLength, 0)
audio.setSampleUploadLength(PLAYHEAD, decodedSampleLength)
audio.startSampleUpload(PLAYHEAD)
sys.spin()
}
audio.play(0)
audio.play(PLAYHEAD)
}
if (interactive) {