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Use MediaSource for unsupported formats
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,67 +1,102 @@ | ||
| const strtok3 = require('strtok3'); | ||
| const logger = require('./logger'); | ||
| const { createMediaSourceProcess, readOneJpegFrame } = require('./ffmpeg'); | ||
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| const { getOneRawFrame, encodeLiveRawStream } = require('./ffmpeg'); | ||
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| function createMediaSourceStream({ path, videoStreamIndex, audioStreamIndex, seekTo, size, fps }) { | ||
| const abortController = new AbortController(); | ||
| logger.info('Starting preview process', { videoStreamIndex, audioStreamIndex, seekTo }); | ||
| const process = createMediaSourceProcess({ path, videoStreamIndex, audioStreamIndex, seekTo, size, fps }); | ||
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| let aborters = []; | ||
| abortController.signal.onabort = () => { | ||
| logger.info('Aborting preview process', { videoStreamIndex, audioStreamIndex, seekTo }); | ||
| process.kill('SIGKILL'); | ||
| }; | ||
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| async function command({ path, inWidth, inHeight, streamIndex, seekTo: commandedTime, onRawFrame, onJpegFrame, playing }) { | ||
| let process; | ||
| let aborted = false; | ||
| process.stdout.pause(); | ||
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| function killProcess() { | ||
| if (process) { | ||
| process.kill(); | ||
| process = undefined; | ||
| } | ||
| async function readChunk() { | ||
| return new Promise((resolve, reject) => { | ||
| let cleanup; | ||
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| const onClose = () => { | ||
| cleanup(); | ||
| resolve(null); | ||
| }; | ||
| const onData = (chunk) => { | ||
| process.stdout.pause(); | ||
| cleanup(); | ||
| resolve(chunk); | ||
| }; | ||
| const onError = (err) => { | ||
| cleanup(); | ||
| reject(err); | ||
| }; | ||
| cleanup = () => { | ||
| process.stdout.off('data', onData); | ||
| process.stdout.off('error', onError); | ||
| process.stdout.off('close', onClose); | ||
| }; | ||
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| process.stdout.once('data', onData); | ||
| process.stdout.once('error', onError); | ||
| process.stdout.once('close', onClose); | ||
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| process.stdout.resume(); | ||
| }); | ||
| } | ||
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| function abort() { | ||
| aborted = true; | ||
| killProcess(); | ||
| aborters = aborters.filter(((aborter) => aborter !== abort)); | ||
| abortController.abort(); | ||
| } | ||
| aborters.push(abort); | ||
|
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| try { | ||
| if (playing) { | ||
| const { process: processIn, channels, width, height } = encodeLiveRawStream({ path, inWidth, inHeight, streamIndex, seekTo: commandedTime }); | ||
| process = processIn; | ||
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| // process.stderr.on('data', data => console.log(data.toString('utf-8'))); | ||
| let stderr = Buffer.alloc(0); | ||
| process.stderr?.on('data', (chunk) => { | ||
| stderr = Buffer.concat([stderr, chunk]); | ||
| }); | ||
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| const tokenizer = await strtok3.fromStream(process.stdout); | ||
| if (aborted) return; | ||
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| const size = width * height * channels; | ||
| const rgbaImage = Buffer.allocUnsafe(size); | ||
| (async () => { | ||
| try { | ||
| await process; | ||
| } catch (err) { | ||
| if (err instanceof Error && err.name === 'AbortError') { | ||
| return; | ||
| } | ||
|
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||
| while (!aborted) { | ||
| // eslint-disable-next-line no-await-in-loop | ||
| await tokenizer.readBuffer(rgbaImage, { length: size }); | ||
| if (aborted) return; | ||
| // eslint-disable-next-line no-await-in-loop | ||
| await onRawFrame(rgbaImage, width, height); | ||
| if (!err.killed) { | ||
| console.warn(err.message); | ||
| console.warn(stderr.toString('utf-8')); | ||
| } | ||
| } else { | ||
| const { process: processIn, width, height } = getOneRawFrame({ path, inWidth, inHeight, streamIndex, seekTo: commandedTime, outSize: 1000 }); | ||
| process = processIn; | ||
| const { stdout: jpegImage } = await process; | ||
| if (aborted) return; | ||
| onJpegFrame(jpegImage, width, height); | ||
| } | ||
| } catch (err) { | ||
| if (!err.killed) console.warn(err.message); | ||
| } finally { | ||
| killProcess(); | ||
| } | ||
| })(); | ||
|
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| return { abort, readChunk }; | ||
| } | ||
|
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| function abortAll() { | ||
| aborters.forEach((aborter) => aborter()); | ||
| function readOneJpegFrameWrapper({ path, seekTo, videoStreamIndex }) { | ||
| const abortController = new AbortController(); | ||
| const process = readOneJpegFrame({ path, seekTo, videoStreamIndex }); | ||
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| abortController.signal.onabort = () => process.kill('SIGKILL'); | ||
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| function abort() { | ||
| abortController.abort(); | ||
| } | ||
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| const promise = (async () => { | ||
| try { | ||
| const { stdout } = await process; | ||
| return stdout; | ||
| } catch (err) { | ||
| logger.error('renderOneJpegFrame', err.shortMessage); | ||
| throw new Error('Failed to render JPEG frame'); | ||
| } | ||
| })(); | ||
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| return { promise, abort }; | ||
| } | ||
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| module.exports = { | ||
| command, | ||
| abortAll, | ||
| createMediaSourceStream, | ||
| readOneJpegFrame: readOneJpegFrameWrapper, | ||
| }; |
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