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signals: Add support for starting and stopping cefsrc from js
See the sample in the html/ directory for an example usage. This should
be useful for those webpages that have non-trivial load times (webgl
apps, etc) - allowing the page to signal from javascript to the gst
pipeline that the page is ready for display. We can also send an EOS
signal to be turned into an event on cefsrc.
Flag for enabling this feature is listen-for-js-signals, and then on the
javascript side you can send signals (see html sample for detail):
window.gstSendMsg({ request: "ready" | "eos", ...})- Loading branch information
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| <html> | ||
| <head> | ||
| <title>Signals Sample</title> | ||
| <script language="JavaScript"> | ||
| const tStart = 3; // s | ||
| const tBad = 1; // s | ||
| const tDur = 5; // s | ||
| const dt = 0.1; // s | ||
| let time = 0; | ||
| let remTime = tStart + tDur; | ||
|
|
||
| function sendMessage(msg) { | ||
| // Send "command" to renderer process in CEF, which gets routed to | ||
| // the main thread | ||
| window.gstSendMsg({ | ||
| request: msg, | ||
| onSuccess: function(response) { | ||
| try { | ||
| const json = JSON.parse(response); | ||
| showResult(json, false); | ||
| if (json && json.success && json.cmd === "ready") { | ||
| console.log("sending eos signal in 5s..."); | ||
| setTimeout(() => { | ||
| console.log("sending eos signal"); | ||
| sendMessage("eos"); | ||
| }, tDur * 1000); | ||
| } | ||
| } catch (e) { | ||
| console.error("parse error", e); | ||
| } | ||
| }, | ||
| onFailure: function(error_code, error_message) { | ||
| try { | ||
| const json = JSON.parse(error_message); | ||
| showResult(json, true); | ||
| } catch (e) { | ||
| console.error("parse error", e); | ||
| } | ||
| } | ||
| }); | ||
| } | ||
|
|
||
| function showResult(resultJson, isError) { | ||
| document.getElementById("result").innerHTML += | ||
| "<br />" + `${isError ? "error" : "response"} at ${time.toFixed(1)}s: ` + "<br />" + | ||
| JSON.stringify(resultJson, null, 4); | ||
| } | ||
|
|
||
| console.log("sending 'ready' signal in 3s..."); | ||
| setTimeout(() => { | ||
| console.log("sending 'ready' signal"); | ||
| sendMessage("ready"); | ||
| }, tStart * 1000); | ||
|
|
||
| setTimeout(() => { | ||
| console.log("sending test 'bad' signal"); | ||
| sendMessage("bad"); | ||
| }, (tStart + tBad) * 1000); | ||
|
|
||
| setInterval(() => { | ||
| document.getElementById("timer").innerHTML = | ||
| `countdown: ${remTime.toFixed(1)}s` + "<br />" + | ||
| `running: ${time.toFixed(1)}s`; | ||
|
|
||
| time += dt; | ||
| remTime -= dt; | ||
| }, dt * 1000); | ||
| </script> | ||
| </head> | ||
| <body | ||
| style=" | ||
| overflow: hidden; | ||
| position: absolute; | ||
| width: 100%; | ||
| height: 100%; | ||
| display: flex; | ||
| flex-direction: column; | ||
| gap: 20px; | ||
| justify-content: center; | ||
| align-items: center; | ||
| background-color: white; | ||
| " | ||
| > | ||
| <div id="result" style="background-color: aqua; width: 30%; text-align: center;"> | ||
| Responses: | ||
| </div> | ||
| <div id="timer" style="background-color: hotpink; width: 30%; text-align: center;"></div> | ||
| </div> | ||
| </body> | ||
| </html> |