Method collectScreenRecordingMediaTracks

data/src/emulator.js:6031–6071

(canvasEl, fps)

    }

    collectScreenRecordingMediaTracks(canvasEl, fps) {
        let videoTrack = null;
        const videoTracks = canvasEl.captureStream(fps).getVideoTracks();
        if (videoTracks.length !== 0) {
            videoTrack = videoTracks[0];
        } else {
            console.error("Unable to capture video stream");
            return null;
        }

        let audioTrack = null;
        if (this.Module.AL && this.Module.AL.currentCtx && this.Module.AL.currentCtx.audioCtx) {
            const alContext = this.Module.AL.currentCtx;
            const audioContext = alContext.audioCtx;

            const gainNodes = [];
            for (let sourceIdx in alContext.sources) {
                gainNodes.push(alContext.sources[sourceIdx].gain);
            }

            const merger = audioContext.createChannelMerger(gainNodes.length);
            gainNodes.forEach(node => node.connect(merger));

            const destination = audioContext.createMediaStreamDestination();
            merger.connect(destination);

            const audioTracks = destination.stream.getAudioTracks();
            if (audioTracks.length !== 0) {
                audioTrack = audioTracks[0];
            }
        }

        const stream = new MediaStream();
        if (videoTrack && videoTrack.readyState === "live") {
            stream.addTrack(videoTrack);
        }
        if (audioTrack && audioTrack.readyState === "live") {
            stream.addTrack(audioTrack);
        }
        return stream;
    }

    screenRecord() {
        const captureFps = this.getSettingValue("screenRecordingFPS") || this.capture.video.fps;