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Example of streamer with access to media devices
This streamer can be used to publish the following types of or playback WebRTC streams on Web Call Server
- WebRTC
- RTMFP
- RTMP
and allows to select media devices and parameters for the published video
...
On the screenshot below a stream is being published from the client.
Two videos video elements are played displayed on the page
- 'Local' - video from the camera
- 'PreviewPlayer' - the video as received from the server
Code of the example
The path to the source code of the example on WCS server is:
...
Here host is the address of the WCS server.
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Analyzing the code
To analyze the code, let's take the version of file manager.js whith hash ecbadc3, which is available here and and can be downloaded with corresponding build 2.0.5.28.2747212.
1. Initialization of the API.
Flashphoner.init() code
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Flashphoner.init({ flashMediaProviderSwfLocationscreenSharingExtensionId: '../../../../media-provider.swf'extensionId, mediaProvidersReadyCallback: function (mediaProviders) { //hide remote video if current media provider is Flash if (mediaProviders[0] == "Flash"if (Flashphoner.isUsingTemasys()) { $("#fecForm#audioInputForm").hide(); $("#stereoForm#videoInputForm").hide(); $("#sendAudioBitrateForm").hide();} } $("#cpuOveruseDetectionForm").hide(); }) |
2. List available input media devices.
Flashphoner.getMediaDevices() code
When input media devices are listed, drop-down lists of microphones and cameras on client page are filled.
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Flashphoner.getMediaDevices(null, true).then(function (list) { } list.audio.forEach(function (device) { if (Flashphoner.isUsingTemasys()) {... }); $("#audioInputForm").hide();list.video.forEach(function (device) { ... $("#videoInputForm").hide(}); ... }).catch(function }(error) { } $("#notifyFlash").text("Failed to get media devices"); }); |
23. List available output media devices.
Flashphoner.getMediaDevices() код code
When output media devices are listed, drop-down lists of spakers and headphones on client page are filled.
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Flashphoner.getMediaDevices(null, true, MEDIA_DEVICE_KIND.OUTPUT).then(function (list) { list.audio.forEach(function (device) { ... }); list.video.forEach... }).catch(function (deviceerror) { $("#notifyFlash").text("Failed to get ... }); ... }).catch(function (error) { $("#notifyFlash").text("Failed to get media devices")media devices"); }); |
34. Get audio and video publishing constraints from client page
getConstraints() code
Publishing sources:
- camera (sendVideo)
- microphone (sendAudio)
- HTML5 Canvas (sendCanvasStream)
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constraints = { audio: $("#sendAudio").is(':checked'), video: $("#sendVideo").is(':checked'), customStream: $("#sendCanvasStream").is(':checked') }; |
Audio constraints:
- microphone choise (deviceId)
- error correction for Opus codec (fec)
- stereo mode (stereo)
- audio bitrate (bitrate)
...
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| constraints.video = {
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constraints.video = {
deviceId: {exact: $('#videoInput').val()},
width: parseInt($('#sendWidth').val()),
height: parseInt($('#sendHeight').val())
};
if (Browser.isSafariWebRTC() && Browser.isiOS() && Flashphoner.getMediaProviders()[0] === "WebRTC") {
constraints.video.deviceId = {exact: $('#videoInput').val()};
}
if (parseInt($('#sendVideoMinBitrate').val()) > 0)
constraints.video.minBitrate = parseInt($('#sendVideoMinBitrate').val());
if (parseInt($('#sendVideoMaxBitrate').val()) > 0)
constraints.video.maxBitrate = parseInt($('#sendVideoMaxBitrate').val());
if (parseInt($('#fps').val()) > 0)
constraints.video.frameRate = parseInt($('#fps').val());
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5. Get access to media devices for local test
Flashphoner.getMediaAccess() code
Audio and video constraints and <div>-element to display captured video are passed to the method.
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Flashphoner.getMediaAccess(getConstraints(), localVideo).then(function (disp) {
$("#testBtn").text("Release").off('click').click(function () {
$(this).prop('disabled', true);
stopTest();
}).prop('disabled', false);
...
testStarted = true;
}).catch(function (error) {
$("#testBtn").prop('disabled', false);
testStarted = false;
}); |
6. Connecting to the server
Flashphoner.createSession() code
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Flashphoner.createSession({urlServer: url, timeout: tm}).on(SESSION_STATUS.ESTABLISHED, function (session) {
...
}).on(SESSION_STATUS.DISCONNECTED, function () {
...
}).on(SESSION_STATUS.FAILED, function () {
...
}); |
7. Receiving the event confirming successful connection
ConnectionStatusEvent ESTABLISHED code
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Flashphoner.createSession({urlServer: url, timeout: tm}).on(SESSION_STATUS.ESTABLISHED, function (session) {
setStatus("#connectStatus", session.status());
onConnected(session);
...
}); |
8. Stream publishing
session.createStream(), publishStream.publish() code
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publishStream = session.createStream({
name: streamName,
display: localVideo,
cacheLocalResources: true,
constraints: constraints,
mediaConnectionConstraints: mediaConnectionConstraints,
sdpHook: rewriteSdp,
transport: transportInput,
cvoExtension: cvo,
stripCodecs: strippedCodecs,
videoContentHint: contentHint
...
});
publishStream.publish(); |
9. Receiving the event confirming successful streaming
StreamStatusEvent PUBLISHING code
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publishStream = session.createStream({
...
}).on(STREAM_STATUS.PUBLISHING, function (stream) {
$("#testBtn").prop('disabled', true);
var video = document.getElementById(stream.id());
//resize local if resolution is available
if (video.videoWidth > 0 && video.videoHeight > 0) {
resizeLocalVideo({target: video});
}
enablePublishToggles(true);
if ($("#muteVideoToggle").is(":checked")) {
muteVideo();
}
if ($("#muteAudioToggle").is(":checked")) {
muteAudio();
}
//remove resize listener in case this video was cached earlier
video.removeEventListener('resize', resizeLocalVideo);
video.addEventListener('resize', resizeLocalVideo);
publishStream.setMicrophoneGain(currentGainValue);
setStatus("#publishStatus", STREAM_STATUS.PUBLISHING);
onPublishing(stream);
}).on(STREAM_STATUS.UNPUBLISHED, function () {
...
}).on(STREAM_STATUS.FAILED, function () {
...
});
publishStream.publish(); |
10. Stream playback
session.createStream(), previewStream.play() code
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previewStream = session.createStream({
name: streamName,
display: remoteVideo,
constraints: constraints,
transport: transportOutput,
stripCodecs: strippedCodecs
...
});
previewStream.play(); |
11. Receiving the event confirming successful playback
StreamStatusEvent PLAYING code
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previewStream = session.createStream({
...
}).on(STREAM_STATUS.PLAYING, function (stream) {
playConnectionQualityStat.connectionQualityUpdateTimestamp = new Date().valueOf();
setStatus("#playStatus", stream.status());
onPlaying(stream);
document.getElementById(stream.id()).addEventListener('resize', function (event) {
$("#playResolution").text(event.target.videoWidth + "x" + event.target.videoHeight);
resizeVideo(event.target);
});
//wait for incoming stream
if (Flashphoner.getMediaProviders()[0] == "WebRTC") {
setTimeout(function () {
if(Browser.isChrome()) {
detectSpeechChrome(stream);
} else {
detectSpeech(stream);
}
}, 3000);
}
...
});
previewStream.play(); |
12. Stop stream playback
stream.stop() code
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$("#playBtn").text("Stop").off('click').click(function () {
$(this).prop('disabled', true);
stream.stop();
}).prop('disabled', false); |
13. Receiving the event confirming successful playback stop
StreamStatusEvent STOPPED code
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previewStream = session.createStream({
...
}).on(STREAM_STATUS.STOPPED, function () {
setStatus("#playStatus", STREAM_STATUS.STOPPED);
onStopped();
...
});
previewStream.play(); |
14. Stop stream publishing
stream.stop() code
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$("#publishBtn").text("Stop").off('click').click(function () {
$(this).prop('disabled', true);
stream.stop();
}).prop('disabled', false); |
15. Receiving the event confirming successful publishsing stop
StreamStatusEvent UNPUBLISHED code
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publishStream = session.createStream({
...
}).on(STREAM_STATUS.UNPUBLISHED, function () {
setStatus("#publishStatus", STREAM_STATUS.UNPUBLISHED);
onUnpublished();
...
});
publishStream.publish(); |
16. Mute publisher audio
stream.muteAudio() code:
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function muteAudio() {
if (publishStream) {
publishStream.muteAudio();
}
} |
17. Mute publisher video
stream.muteVideo() code:
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function muteVideo() {
if (publishStream) {
publishStream.muteVideo();
}
} |
18. Show WebRTC stream publishing statistics
stream.getStats() code:
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publishStream.getStats(function (stats) { if (stats && stats.outboundStream) { if (stats.outboundStream.video) { showStat(stats.outboundStream.video, "outVideoStat"); let vBitrate = (stats.outboundStream.video.bytesSent - videoBytesSent) * 8; if ($('#outVideoStatBitrate').length == 0) { let html = "<div>Bitrate: " + "<span id='outVideoStatBitrate' style='font-weight: normal'>" + vBitrate + "</span>" + "</div>"; deviceId: {exact: $('#videoInput'"#outVideoStat").valappend(html)}, ; } else { width: parseInt($('#sendWidth#outVideoStatBitrate').valtext(vBitrate)),; height: parseInt($('#sendHeight').val()) } }; videoBytesSent if (Browser.isSafariWebRTC() && Browser.isiOS() && Flashphoner.getMediaProviders()[0] === "WebRTC") { = stats.outboundStream.video.bytesSent; constraints..video.width = {min: parseInt($('#sendWidth').val()), max: 640}; } constraints.video.height = {min: parseInt($('#sendHeight').val()), max: 480}; if (stats.outboundStream.audio) { } if (parseInt($('#sendVideoMinBitrate').val()) > 0) showStat(stats.outboundStream.audio, "outAudioStat"); let constraints.video.minBitrateaBitrate = parseInt($('#sendVideoMinBitrate').val()); (stats.outboundStream.audio.bytesSent - audioBytesSent) * 8; if (parseInt($('#sendVideoMaxBitrate#outAudioStatBitrate').val()) >).length == 0) { constraints.video.maxBitrate = parseInt($('#sendVideoMaxBitrate').val()); let html = "<div>Bitrate: " + if (parseInt($('#fps').val()) > 0) "<span id='outAudioStatBitrate' style='font-weight: normal'>" + aBitrate + "</span>" + "</div>"; constraints.video.frameRate = parseInt($('#fps').val()); |
4. Get access to media devices for local test
Flashphoner.getMediaAccess() code
Audio and video constraints and <div>-element to display captured video are passed to the method.
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Flashphoner.getMediaAccess(getConstraints(), localVideo).then(function (disp) { $("#outAudioStat").append(html); } else { $("#testBtn").text("Release").off('click'#outAudioStatBitrate').click(function text(aBitrate) {; $(this).prop('disabled', true); } stopTest(); }).prop('disabled', false); audioBytesSent = stats.outboundStream.audio.bytesSent; testStarted = true; }).catch(function (error) { $("#testBtn").prop('disabled', false); } testStarted = false; ... }); |
5. Connecting to the server
Flashphoner.createSession() code19. Show WebRTC stream playback statistics
stream.getStats() code:
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Flashphoner.createSession({urlServer: url}).on(SESSION_STATUS.ESTABLISHED, function (session previewStream.getStats(function (stats) { if (stats && stats.inboundStream) { //session connected, start streaming if startStreaming(session);stats.inboundStream.video) { }).on(SESSION_STATUS.DISCONNECTED, function () { setStatus(SESSION_STATUS.DISCONNECTEDshowStat(stats.inboundStream.video, "inVideoStat"); onStopped(); }).on(SESSION_STATUS.FAILED, function () { let vBitrate = setStatus(SESSION_STATUS.FAILED); (stats.inboundStream.video.bytesReceived - videoBytesReceived) * 8; onStopped(); }); |
6. Receiving the event confirming successful connection
ConnectionStatusEvent ESTABLISHED code
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Flashphoner.createSession({urlServer: url}).on(SESSION_STATUS.ESTABLISHED, function (sessionif ($('#inVideoStatBitrate').length == 0) { //session connected, start streaming let html = "<div>Bitrate: startStreaming(session); }).on(SESSION_STATUS.DISCONNECTED, function () { " + "<span id='inVideoStatBitrate' style='font-weight: normal'>" + vBitrate + "</span>" + "</div>"; ... }).on(SESSION_STATUS.FAILED, function () { ... }); |
7. Stream publishing
session.createStream(), publishStream.publish() code
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$("#inVideoStat").append(html); publishStream = session.createStream({ } name:else streamName, { display: localVideo, cacheLocalResources: true, $('#inVideoStatBitrate').text(vBitrate); constraints: constraints, mediaConnectionConstraints: mediaConnectionConstraints} ... }); publishStream.publish(); |
8. Receiving the event confirming successful streaming
StreamStatusEvent PUBLISHING code
On receiving the event, the preview stream is created with session.createStream() method and play() is called to play it
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publishStreamvideoBytesReceived = session.createStream({stats.inboundStream.video.bytesReceived; name: streamName, display: localVideo, ... cacheLocalResources: true, } constraints: constraints, mediaConnectionConstraints: mediaConnectionConstraints }).on(STREAM_STATUS.PUBLISHING, function (publishStream if (stats.inboundStream.audio) { $("#testBtn").prop('disabled', true); var video = document.getElementById(publishStream.id())showStat(stats.inboundStream.audio, "inAudioStat"); //resize local if resolution is available let aBitrate if= (video.videoWidth > 0 && video.videoHeight > 0) { stats.inboundStream.audio.bytesReceived - audioBytesReceived) * 8; if resizeLocalVideo({target: video}); ($('#inAudioStatBitrate').length == 0) { } enableMuteToggles(true); if ($("#muteVideoToggle").is(":checked")) { muteVideo(); } let html = "<div style='font-weight: bold'>Bitrate: " + "<span id='inAudioStatBitrate' style='font-weight: normal'>" + aBitrate + "</span>" + "</div>"; if ($("#muteAudioToggle").is(":checked")) { muteAudio($("#inAudioStat").append(html); } //remove resize listener in case this video was} cachedelse earlier{ video.removeEventListener('resize', resizeLocalVideo); video.addEventListener('resize', resizeLocalVideo); setStatus(STREAM_STATUS.PUBLISHING); $('#inAudioStatBitrate').text(aBitrate); //play preview var constraints = {} audio: $("#playAudio").is(':checked'), audioBytesReceived video: $("#playVideo").is(':checked')= stats.inboundStream.audio.bytesReceived; }; } if (constraints.video) { constraints...video = { } width: (!$("#receiveDefaultSize").is(":checked")) ? parseInt($('#receiveWidth').val()) : 0, height: (!$("#receiveDefaultSize").is(":checked")) ? parseInt($('#receiveHeight').val()) : 0, bitrate: (!$("#receiveDefaultBitrate").is(":checked")) ? $("#receiveBitrate").val() : 0, quality: (!$("#receiveDefaultQuality").is(":checked")) ? $('#quality').val() : 0 }); |
20. Speech detection using ScriptProcessor interface (any browser except Chrome)
audioContext.createMediaStreamSource(), audioContext.createScriptProcessor() code
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function detectSpeech(stream, level, latency) { var mediaStream = document.getElementById(stream.id()).srcObject; var source = audioContext.createMediaStreamSource(mediaStream); var processor = audioContext.createScriptProcessor(512); processor.onaudioprocess = handleAudio; processor.connect(audioContext.destination); processor.clipping = false; processor.lastClip = 0; // threshold processor.threshold = level || 0.10; processor.latency = latency || 750; processor.isSpeech = function () { if (!this.clipping) return }false; } if ((this.lastClip + this.latency) < previewStreamwindow.performance.now()) this.clipping = session.createStream({false; name: streamName,return this.clipping; }; display: remoteVideo, source.connect(processor); // Check speech every 500 ms speechIntervalID constraints: constraints = setInterval(function () { if ...(processor.isSpeech()) { }); previewStream.play($("#talking").css('background-color', 'green'); }).on(STREAM_STATUS.UNPUBLISHED, function () } else { ... }$("#talking").on(STREAM_STATUS.FAILED, function () {css('background-color', 'red'); ...} }, 500); publishStream.publish(); |
9. Preview stream playback stop
...
} |
Audio data handler code
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function handleAudio(event) { $("#publishBtn").text("Stop").off('click').click(function () { $(this).prop('disabled', true); previewStream.stop(); }).prop('disabled', false); |
10. Receiving the event confirming successful playback stop
StreamStatusEvent STOPPED code
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var buf = event.inputBuffer.getChannelData(0); var bufLength = buf.length; var x; for (var i = 0; i < bufLength; i++) { x = buf[i]; previewStream if (Math.abs(x) >= session.createStream(this.threshold) { this.clipping name: streamName,= true; display: remoteVideo,this.lastClip = window.performance.now(); } constraints: constraints }).on(STREAM_STATUS.PLAYING, function (previewStream} } |
21. Speech detection using incoming audio WebRTC statistics in Chrome browser
stream.getStats() code
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function detectSpeechChrome(stream, level, latency) { statSpeechDetector.threshold = level || 0.010; statSpeechDetector... latency = latency || 750; }).on(STREAM_STATUS.STOPPED, function () {statSpeechDetector.clipping = false; statSpeechDetector.lastClip = 0; speechIntervalID publishStream.stop= setInterval(function(); { })stream.on(STREAM_STATUS.FAILED, function (getStats(function(stat) { ... let audioStats = stat.inboundStream.audio; }); previewStream.playif(); |
11. Streaming stop after preview playback stopped
publishStream.stop() code
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!audioStats) { previewStream = session.createStream({ return; name: streamName, } display: remoteVideo, // Using audioLevel WebRTC stats parameter constraints: constraints if }).on(STREAM_STATUS.PLAYING, function (previewStream(audioStats.audioLevel >= statSpeechDetector.threshold) { ... }).on(STREAM_STATUS.STOPPED, function () {statSpeechDetector.clipping = true; publishStream.stop(); statSpeechDetector.lastClip = }).on(STREAM_STATUS.FAILED, function () {window.performance.now(); ...} }); if ((statSpeechDetector.lastClip + previewStreamstatSpeechDetector.play(); |
12. Receiving the event confirming successful streaming stop
StreamStatusEvent UNPUBLISHED код
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publishStream = session.createStream({ name: streamName,latency) < window.performance.now()) { display: localVideo, statSpeechDetector.clipping cacheLocalResources: true,= false; constraints: constraints, } mediaConnectionConstraints: mediaConnectionConstraints if }).on(STREAM_STATUS.PUBLISHING, function (publishStream(statSpeechDetector.clipping) { ... }$("#talking").on(STREAM_STATUS.UNPUBLISHED, function () { css('background-color', 'green'); setStatus(STREAM_STATUS.UNPUBLISHED); } else { //enable start button onStopped($("#talking").css('background-color', 'red'); }).on(STREAM_STATUS.FAILED, function () { } ... }); publishStream.publish(},500); } |