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<!doctype html>
<meta charset=utf-8>
<title>RTCRtpParameters encodings</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="dictionary-helper.js"></script>
<script src="RTCRtpParameters-helper.js"></script>
<script>
'use strict';
// Test is based on the following editor draft:
// https://w3c.github.io/webrtc-pc/archives/20170605/webrtc.html
// The following helper functions are called from RTCRtpParameters-helper.js:
// validateSenderRtpParameters
/*
5.1. RTCPeerConnection Interface Extensions
partial interface RTCPeerConnection {
RTCRtpTransceiver addTransceiver((MediaStreamTrack or DOMString) trackOrKind,
optional RTCRtpTransceiverInit init);
...
};
dictionary RTCRtpTransceiverInit {
RTCRtpTransceiverDirection direction = "sendrecv";
sequence<MediaStream> streams;
sequence<RTCRtpEncodingParameters> sendEncodings;
};
5.2. RTCRtpSender Interface
interface RTCRtpSender {
Promise<void> setParameters(optional RTCRtpParameters parameters);
RTCRtpParameters getParameters();
};
dictionary RTCRtpParameters {
DOMString transactionId;
sequence<RTCRtpEncodingParameters> encodings;
sequence<RTCRtpHeaderExtensionParameters> headerExtensions;
RTCRtcpParameters rtcp;
sequence<RTCRtpCodecParameters> codecs;
RTCDegradationPreference degradationPreference;
};
dictionary RTCRtpEncodingParameters {
[readonly]
unsigned long ssrc;
[readonly]
RTCRtpRtxParameters rtx;
[readonly]
RTCRtpFecParameters fec;
RTCDtxStatus dtx;
boolean active;
RTCPriorityType priority;
unsigned long ptime;
unsigned long maxBitrate;
double maxFramerate;
[readonly]
DOMString rid;
double scaleResolutionDownBy;
};
dictionary RTCRtpRtxParameters {
[readonly]
unsigned long ssrc;
};
dictionary RTCRtpFecParameters {
[readonly]
unsigned long ssrc;
};
enum RTCDtxStatus {
"disabled",
"enabled"
};
enum RTCPriorityType {
"very-low",
"low",
"medium",
"high"
};
getParameters
- encodings is set to the value of the [[send encodings]] internal slot.
*/
// Get the first encoding in param.encodings.
// Asserts that param.encodings has at least one element.
function getFirstEncoding(param) {
const { encodings } = param;
assert_equals(encodings.length, 1);
return encodings[0];
}
/*
5.1. addTransceiver
7. Create an RTCRtpSender with track, streams and sendEncodings and let sender
be the result.
5.2. create an RTCRtpSender
5. Let sender have a [[send encodings]] internal slot, representing a list
of RTCRtpEncodingParameters dictionaries.
6. If sendEncodings is given as input to this algorithm, and is non-empty,
set the [[send encodings]] slot to sendEncodings.
Otherwise, set it to a list containing a single RTCRtpEncodingParameters
with active set to true.
*/
test(() => {
const pc = new RTCPeerConnection();
const transceiver = pc.addTransceiver('audio');
const param = transceiver.sender.getParameters();
validateSenderRtpParameters(param);
const { encodings } = param;
const encoding = getFirstEncoding(param);
assert_equals(encoding.active, true);
}, 'addTransceiver() with undefined sendEncodings should have default encoding parameter with active set to true');
test(() => {
const pc = new RTCPeerConnection();
const transceiver = pc.addTransceiver('audio', { sendEncodings: [] });
const param = transceiver.sender.getParameters();
validateSenderRtpParameters(param);
const { encodings } = param;
const encoding = getFirstEncoding(param);
assert_equals(encoding.active, true);
}, 'addTransceiver() with empty list sendEncodings should have default encoding parameter with active set to true');
/*
5.2. create an RTCRtpSender
To create an RTCRtpSender with a MediaStreamTrack , track, a list of MediaStream
objects, streams, and optionally a list of RTCRtpEncodingParameters objects,
sendEncodings, run the following steps:
5. Let sender have a [[send encodings]] internal slot, representing a list
of RTCRtpEncodingParameters dictionaries.
6. If sendEncodings is given as input to this algorithm, and is non-empty,
set the [[send encodings]] slot to sendEncodings.
5.2. getParameters
- encodings is set to the value of the [[send encodings]] internal slot.
*/
test(() => {
const pc = new RTCPeerConnection();
const { sender } = pc.addTransceiver('audio', {
sendEncodings: [{
dtx: 'enabled',
active: false,
priority: 'low',
ptime: 5,
maxBitrate: 8,
maxFramerate: 25,
rid: 'foo'
}]
});
const param = sender.getParameters();
validateSenderRtpParameters(param);
const encoding = getFirstEncoding(param);
assert_equals(encoding.dtx, 'enabled');
assert_equals(encoding.active, false);
assert_equals(encoding.priority, 'low');
assert_equals(encoding.ptime, 5);
assert_equals(encoding.maxBitrate, 8);
assert_equals(encoding.maxFramerate, 25);
assert_equals(encoding.rid, 'foo');
}, `sender.getParameters() should return sendEncodings set by addTransceiver()`);
/*
5.2. setParameters
3. Let N be the number of RTCRtpEncodingParameters stored in sender's internal
[[send encodings]] slot.
7. If parameters.encodings.length is different from N, or if any parameter
in the parameters argument, marked as a Read-only parameter, has a value
that is different from the corresponding parameter value returned from
sender.getParameters(), abort these steps and return a promise rejected
with a newly created InvalidModificationError. Note that this also applies
to transactionId.
*/
promise_test(t => {
const pc = new RTCPeerConnection();
const { sender } = pc.addTransceiver('audio');
const param = sender.getParameters();
validateSenderRtpParameters(param);
const { encodings } = param;
assert_equals(encodings.length, 1);
// {} is valid RTCRtpEncodingParameters because all fields are optional
encodings.push({});
assert_equals(param.encodings.length, 2);
return promise_rejects(t, 'InvalidModificationError',
sender.setParameters(param));
}, `sender.setParameters() with mismatch number of encodings should reject with InvalidModificationError`);
promise_test(t => {
const pc = new RTCPeerConnection();
const { sender } = pc.addTransceiver('audio');
const param = sender.getParameters();
validateSenderRtpParameters(param);
param.encodings = undefined;
return promise_rejects(t, 'InvalidModificationError',
sender.setParameters(param));
}, `sender.setParameters() with encodings unset should reject with InvalidModificationError`);
promise_test(t => {
const pc = new RTCPeerConnection();
const { sender } = pc.addTransceiver('audio');
const param = sender.getParameters();
validateSenderRtpParameters(param);
const encoding = getFirstEncoding(param);
const { ssrc } = encoding;
// ssrc may not be set since it is optional
if(ssrc === undefined) {
encoding.ssrc = 2;
} else {
// If it is set, increase the number by 1 to make it different from original
encoding.ssrc = ssrc + 1;
}
return promise_rejects(t, 'InvalidModificationError',
sender.setParameters(param));
}, `setParameters() with modified encoding.ssrc field should reject with InvalidModificationError`);
promise_test(t => {
const pc = new RTCPeerConnection();
const { sender } = pc.addTransceiver('audio');
const param = sender.getParameters();
validateSenderRtpParameters(param);
const encoding = getFirstEncoding(param);
const { rtx } = encoding;
if(rtx === undefined) {
encoding.rtx = { ssrc: 2 };
} else if(rtx.ssrc === undefined) {
rtx.ssrc = 2;
} else {
rtx.ssrc += 1;
}
return promise_rejects(t, 'InvalidModificationError',
sender.setParameters(param));
}, `setParameters() with modified encoding.rtx field should reject with InvalidModificationError`);
promise_test(t => {
const pc = new RTCPeerConnection();
const { sender } = pc.addTransceiver('audio');
const param = sender.getParameters();
validateSenderRtpParameters(param);
const encoding = getFirstEncoding(param);
const { fec } = encoding;
if(fec === undefined) {
encoding.fec = { ssrc: 2 };
} else if(fec.ssrc === undefined) {
fec.ssrc = 2;
} else {
fec.ssrc += 1;
}
return promise_rejects(t, 'InvalidModificationError',
sender.setParameters(param));
}, `setParameters() with modified encoding.fec field should reject with InvalidModificationError`);
promise_test(t => {
const pc = new RTCPeerConnection();
const { sender } = pc.addTransceiver('audio', {
sendEncodings: [{ rid: 'foo' }],
});
const param = sender.getParameters();
validateSenderRtpParameters(param);
const encoding = getFirstEncoding(param);
assert_equals(encoding.rid, 'foo');
encoding.rid = 'bar';
return promise_rejects(t, 'InvalidModificationError',
sender.setParameters(param));
}, `setParameters() with modified encoding.rid field should reject with InvalidModificationError`);
/*
5.2. setParameters
8. If the scaleResolutionDownBy parameter in the parameters argument has a
value less than 1.0, abort these steps and return a promise rejected with
a newly created RangeError.
*/
promise_test(t => {
const pc = new RTCPeerConnection();
const { sender } = pc.addTransceiver('audio');
const param = sender.getParameters();
validateSenderRtpParameters(param);
const encoding = getFirstEncoding(param);
encoding.scaleResolutionDownBy = 0.5;
return promise_rejects(t, 'RangeError',
sender.setParameters(param));
}, `setParameters() with encoding.scaleResolutionDownBy field set to less than 1.0 should reject with RangeError`);
promise_test(t => {
const pc = new RTCPeerConnection();
const { sender } = pc.addTransceiver('audio');
const param = sender.getParameters();
validateSenderRtpParameters(param);
const encoding = getFirstEncoding(param);
encoding.scaleResolutionDownBy = 1.5;
return sender.setParameters(param)
.then(() => {
const param = sender.getParameters();
validateSenderRtpParameters(param);
const encoding = getFirstEncoding(param);
assert_approx_equals(encoding.scaleResolutionDownBy, 1.5, 0.01);
});
}, `setParameters() with encoding.scaleResolutionDownBy field set to greater than 1.0 should succeed`);
// Helper function to test that modifying an encoding field should succeed
function test_modified_encoding(field, value1, value2, desc) {
promise_test(t => {
const pc = new RTCPeerConnection();
const { sender } = pc.addTransceiver('audio', {
sendEncodings: [{
[field]: value1
}]
});
const param = sender.getParameters();
validateSenderRtpParameters(param);
const encoding = getFirstEncoding(param);
assert_equals(encoding[field], value1);
encoding[field] = value2;
return sender.setParameters(param)
.then(() => {
const param = sender.getParameters();
validateSenderRtpParameters(param);
const encoding = getFirstEncoding(param);
assert_equals(encoding[field], value2);
});
}, desc);
}
test_modified_encoding('dtx', 'enabled', 'disabled',
'setParameters() with modified encoding.dtx should succeed');
test_modified_encoding('dtx', 'enabled', undefined,
'setParameters() with unset encoding.dtx should succeed');
test_modified_encoding('active', true, false,
'setParameters() with modified encoding.active should succeed');
test_modified_encoding('priority', 'very-low', 'high',
'setParameters() with modified encoding.priority should succeed');
test_modified_encoding('ptime', 2, 4,
'setParameters() with modified encoding.ptime should succeed');
test_modified_encoding('maxBitrate', 2, 4,
'setParameters() with modified encoding.maxBitrate should succeed');
test_modified_encoding('maxBitrate', 24, 16,
'setParameters() with modified encoding.maxFramerate should succeed');
</script>
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