Bug 161715 – [MediaStream] applyConstraints pt. 2 - advanced constraints

• Component: Media
• Status: RESOLVED FIXED

[Eric Carlson]

Add advanced constraint support to MediaStreamTrack.applyConstraints.

[Radar WebKit Bug Importer]

<rdar://problem/28195461>

[Eric Carlson]

Created attachment 288194 [details]
Proposed patch.

[Dean Jackson]

Comment on attachment 288194 [details]
Proposed patch.

View in context: https://bugs.webkit.org/attachment.cgi?id=288194&action=review

> Source/WebCore/platform/mediastream/MediaConstraints.cpp:196
> +    // 2. If the constraint is required ('min', 'max', or 'exact'), and the settings
> +    //    dictionary's value for the constraint does not satisfy the constraint, the
> +    //    fitness distance is positive infinity.
> +    if (!m_exact.isEmpty() && m_exact.find(value) == notFound)
> +        return std::numeric_limits<double>::infinity();

So there is no concept of min or max on a StringConstraint?

> Source/WebCore/platform/mediastream/MediaConstraints.cpp:217
> +        double distance = fitnessDistance(value);
> +        if (distance < minimumDistance)
> +            minimumDistance = distance;

Maybe just minimumDistance = std::min(minimumDistance, fitnessDistance(value)); ?

> Source/WebCore/platform/mediastream/RealtimeMediaSource.cpp:447
> +    // 4. If candidates is empty, return undefined as the result of the SelectSettings() algorithm.
> +    if (candidates.isEmpty())
> +        return true;

How is true == undefined? Does this mean it is a valid but empty result?

[Eric Carlson]

Comment on attachment 288194 [details]
Proposed patch.

View in context: https://bugs.webkit.org/attachment.cgi?id=288194&action=review

>> Source/WebCore/platform/mediastream/MediaConstraints.cpp:196
>> +        return std::numeric_limits<double>::infinity();
> 
> So there is no concept of min or max on a StringConstraint?

No, only exact and idea.

>> Source/WebCore/platform/mediastream/MediaConstraints.cpp:217
>> +            minimumDistance = distance;
> 
> Maybe just minimumDistance = std::min(minimumDistance, fitnessDistance(value)); ?

good idea, thanks!

>> Source/WebCore/platform/mediastream/RealtimeMediaSource.cpp:447
>> +        return true;
> 
> How is true == undefined? Does this mean it is a valid but empty result?

Correct, there are no valid constraints and none are impossible to support.

[Eric Carlson]

Created attachment 288202 [details]
Patch for landing.

[WebKit Commit Bot]

Comment on attachment 288202 [details]
Patch for landing.

Clearing flags on attachment: 288202

Committed r205574: <http://trac.webkit.org/changeset/205574>