mirror of
https://github.com/libretro/RetroArch.git
synced 2024-12-08 08:27:57 +00:00
0256156a6b
fixes audio getting stuck in an always fast state
170 lines
4.5 KiB
JavaScript
170 lines
4.5 KiB
JavaScript
//"use strict";
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var LibraryRWebAudio = {
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$RA__deps: ['$Browser', 'usleep'],
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$RA: {
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BUFFER_SIZE: 2048,
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context: null,
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buffers: [],
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numBuffers: 0,
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bufIndex: 0,
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bufOffset: 0,
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startTime: 0,
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nonblock: false,
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currentTimeWorkaround: false,
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setStartTime: function() {
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if (RA.context.currentTime) {
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RA.startTime = window['performance']['now']() - RA.context.currentTime * 1000;
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Module["resumeMainLoop"]();
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} else window['setTimeout'](RA.setStartTime, 0);
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},
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getCurrentPerfTime: function() {
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if (RA.startTime) return (window['performance']['now']() - RA.startTime) / 1000;
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else return 0;
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},
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process: function(queueBuffers) {
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var currentTime = RA.getCurrentPerfTime();
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for (var i = 0; i < RA.bufIndex; i++) {
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if (RA.buffers[i].endTime !== 0 && RA.buffers[i].endTime < currentTime) {
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RA.buffers[i].endTime = 0;
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var buf = RA.buffers.splice(i, 1);
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RA.buffers[RA.numBuffers - 1] = buf[0];
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i--;
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RA.bufIndex--;
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}
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}
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},
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fillBuffer: function(buf, samples) {
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var count = 0;
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const leftBuffer = RA.buffers[RA.bufIndex].getChannelData(0);
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const rightBuffer = RA.buffers[RA.bufIndex].getChannelData(1);
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while (samples && RA.bufOffset !== RA.BUFFER_SIZE) {
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leftBuffer[RA.bufOffset] = {{{ makeGetValue('buf', 'count * 8', 'float') }}};
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rightBuffer[RA.bufOffset] = {{{ makeGetValue('buf', 'count * 8 + 4', 'float') }}};
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RA.bufOffset++;
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count++;
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samples--;
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}
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return count;
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},
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queueAudio: function() {
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var index = RA.bufIndex;
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var startTime;
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if (RA.bufIndex) startTime = RA.buffers[RA.bufIndex - 1].endTime;
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else startTime = RA.context.currentTime;
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RA.buffers[index].endTime = startTime + RA.buffers[index].duration;
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const bufferSource = RA.context.createBufferSource();
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bufferSource.buffer = RA.buffers[index];
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bufferSource.connect(RA.context.destination);
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bufferSource.start(startTime);
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RA.bufIndex++;
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RA.bufOffset = 0;
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},
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block: function() {
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do {
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RA.process();
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} while (RA.bufIndex === RA.numBuffers);
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}
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},
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RWebAudioInit: function(latency) {
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var ac = window['AudioContext'] || window['webkitAudioContext'];
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if (!ac) return 0;
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RA.context = new ac();
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RA.numBuffers = ((latency * RA.context.sampleRate) / (1000 * RA.BUFFER_SIZE))|0;
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if (RA.numBuffers < 2) RA.numBuffers = 2;
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for (var i = 0; i < RA.numBuffers; i++) {
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RA.buffers[i] = RA.context.createBuffer(2, RA.BUFFER_SIZE, RA.context.sampleRate);
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RA.buffers[i].endTime = 0
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}
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RA.nonblock = false;
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RA.startTime = 0;
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// chrome hack to get currentTime running
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RA.context.createGain();
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window['setTimeout'](RA.setStartTime, 0);
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Module["pauseMainLoop"]();
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return 1;
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},
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RWebAudioSampleRate: function() {
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return RA.context.sampleRate;
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},
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RWebAudioWrite: function (buf, size) {
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RA.process();
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var samples = size / 8;
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var count = 0;
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while (samples) {
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if (RA.bufIndex === RA.numBuffers) {
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if (RA.nonblock) break;
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else RA.block();
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}
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var fill = RA.fillBuffer(buf, samples);
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samples -= fill;
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count += fill;
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buf += fill * 8;
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if (RA.bufOffset === RA.BUFFER_SIZE) {
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RA.queueAudio();
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}
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}
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return count * 8;
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},
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RWebAudioStop: function() {
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RA.bufIndex = 0;
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RA.bufOffset = 0;
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return true;
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},
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RWebAudioStart: function() {
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return true;
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},
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RWebAudioSetNonblockState: function(state) {
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RA.nonblock = state;
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},
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RWebAudioFree: function() {
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RA.bufIndex = 0;
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RA.bufOffset = 0;
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},
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RWebAudioBufferSize: function() {
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return RA.numBuffers * RA.BUFFER_SIZE * 8;
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},
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RWebAudioWriteAvail: function() {
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RA.process();
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return ((RA.numBuffers - RA.bufIndex) * RA.BUFFER_SIZE - RA.bufOffset) * 8;
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},
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RWebAudioRecalibrateTime: function() {
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if (RA.startTime) {
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RA.startTime = window['performance']['now']() - RA.context.currentTime * 1000;
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}
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}
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};
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autoAddDeps(LibraryRWebAudio, '$RA');
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mergeInto(LibraryManager.library, LibraryRWebAudio);
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