tav-media
Version:
Cross platform media editing framework
128 lines (127 loc) • 5.81 kB
JavaScript
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
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var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
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function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
import { tav } from '../tav';
import { allowCallNativeAnytime } from '../types/tav-object';
import { Dispatcher } from '../utils/dispatcher';
/**
* A video reader is used to obtain the video frames of a media.
* @category Engine
*/
export class TAVVideoReader {
constructor(ref) {
this.ref = ref;
}
/**
* Make a video reader from a media clip.
* @param root The root media clip.
* @param frameRate The frame rate of the video reader.
* @param isRecycle
* @returns New video reader.
*/
static MakeFrom(root, frameRate, isRecycle = false) {
return __awaiter(this, void 0, void 0, function* () {
const rootNative = yield root.build();
if (!rootNative)
return null;
const native = yield tav.webAssemblyQueue.exec(tav.TAVVideoReader.MakeFrom, tav.TAVVideoReader, rootNative, frameRate, isRecycle);
if (!native)
return null;
return new TAVVideoReader(native);
});
}
/**
* Set the surface to render the video frames.
* @param surface The surface to render the video.
*/
setSurface(surface) {
return __awaiter(this, void 0, void 0, function* () {
this.surface = surface;
const nativeSurface = yield surface.build();
if (this.ref && nativeSurface) {
yield tav.webAssemblyQueue.exec(this.ref.setSurface, this.ref, nativeSurface);
}
});
}
/**
* Sets the current frame to the specified time.
* @param targetTime The target time to seek to.
* @returns seeked or not.
*/
seekTo(targetTime) {
return __awaiter(this, void 0, void 0, function* () {
return TAVVideoReader.dispatcher.queue(() => __awaiter(this, void 0, void 0, function* () {
var _a, _b, _c, _d;
if (tav.webAssemblyQueue) {
(_b = (_a = this.surface).prepare) === null || _b === void 0 ? void 0 : _b.call(_a);
const previousHandle = tav.GL.currentContext.handle;
tav.GL.makeContextCurrent(this.surface.webGLContextId);
const result = yield tav.webAssemblyQueue.exec((_c = this.ref) === null || _c === void 0 ? void 0 : _c.seekTo, this.ref, targetTime);
tav.GL.makeContextCurrent(previousHandle);
return result;
}
return yield ((_d = this.ref) === null || _d === void 0 ? void 0 : _d.seekTo(targetTime));
}), 'seekTo');
});
}
/**
* Reads the next video frame for the output.
*/
readNextFrame() {
return __awaiter(this, void 0, void 0, function* () {
yield TAVVideoReader.dispatcher.queue(() => __awaiter(this, void 0, void 0, function* () {
var _a, _b, _c, _d, _e, _f;
if (tav.webAssemblyQueue) {
(_b = (_a = this.surface).prepare) === null || _b === void 0 ? void 0 : _b.call(_a);
const previousHandle = tav.GL.currentContext.handle;
tav.GL.makeContextCurrent(this.surface.webGLContextId);
yield tav.webAssemblyQueue.exec((_c = this.ref) === null || _c === void 0 ? void 0 : _c.readNextFrame, this.ref);
tav.GL.makeContextCurrent(previousHandle);
(_e = (_d = this.surface).present) === null || _e === void 0 ? void 0 : _e.call(_d);
}
else {
return yield ((_f = this.ref) === null || _f === void 0 ? void 0 : _f.readNextFrame());
}
}), 'readNextFrame');
});
}
/**
* Returns the current scale mode.
*/
scaleMode() {
var _a;
return (_a = this.ref) === null || _a === void 0 ? void 0 : _a.scaleMode();
}
/**
* Specifies the rule of how to scale the content to fit the surface size. The matrix
* changes when this method is called.
* @param mode The scale mode.
*/
setScaleMode(mode) {
var _a;
(_a = this.ref) === null || _a === void 0 ? void 0 : _a.setScaleMode(mode);
}
release() {
var _a;
(_a = this.ref) === null || _a === void 0 ? void 0 : _a.release();
}
}
TAVVideoReader.dispatcher = new Dispatcher();
__decorate([
allowCallNativeAnytime
], TAVVideoReader.prototype, "setScaleMode", null);
__decorate([
allowCallNativeAnytime
], TAVVideoReader.prototype, "release", null);