rfc8845.txt   rfc8845-bordersminimal.txt 
skipping to change at line 1005 skipping to change at line 1005
Advertiser to indicate that several MCC captures are used to Advertiser to indicate that several MCC captures are used to
represent a capture scene. Table 14 provides an example of this represent a capture scene. Table 14 provides an example of this
case. case.
As outlined in Section 7.1, each instance of the MCC has its own As outlined in Section 7.1, each instance of the MCC has its own
Capture identity, i.e., MCC1. It allows all the individual captures Capture identity, i.e., MCC1. It allows all the individual captures
contained in the MCC to be referenced by a single MCC identity. contained in the MCC to be referenced by a single MCC identity.
The example below shows the use of a Multiple Content Capture: The example below shows the use of a Multiple Content Capture:
+===================+=========================+ ------------------- -------------------------
| Capture Scene #1 | | Capture Scene #1
+===================+=========================+ VC1 {MC attributes}
| VC1 | {MC attributes} | VC2 {MC attributes}
+-------------------+-------------------------+ VC3 {MC attributes}
| VC2 | {MC attributes} | MCC1(VC1,VC2,VC3) {MC and MCC attributes}
+-------------------+-------------------------+ CSV(MCC1)
| VC3 | {MC attributes} | ------------------- -------------------------
+-------------------+-------------------------+
| MCC1(VC1,VC2,VC3) | {MC and MCC attributes} |
+-------------------+-------------------------+
| CSV(MCC1) | |
+-------------------+-------------------------+
Table 1: Multiple Content Capture Concept Table 1: Multiple Content Capture Concept
This indicates that MCC1 is a single capture that contains the This indicates that MCC1 is a single capture that contains the
Captures VC1, VC2, and VC3, according to any MCC1 attributes. Captures VC1, VC2, and VC3, according to any MCC1 attributes.
7.2.1. MCC Attributes 7.2.1. MCC Attributes
Media Capture Attributes may be associated with the MCC instance and Media Capture Attributes may be associated with the MCC instance and
the Single Media Captures that the MCC references. A Provider should the Single Media Captures that the MCC references. A Provider should
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For example: a virtual scene could be constructed for the MCC capture For example: a virtual scene could be constructed for the MCC capture
with two Video Captures with a "MaxCaptures" attribute set to 2 and with two Video Captures with a "MaxCaptures" attribute set to 2 and
an "Area of Capture" attribute provided with an overall area. Each an "Area of Capture" attribute provided with an overall area. Each
of the individual Captures could then also include an "Area of of the individual Captures could then also include an "Area of
Capture" attribute with a subset of the overall area. The Consumer Capture" attribute with a subset of the overall area. The Consumer
would then know how each capture is related to others within the would then know how each capture is related to others within the
scene, but not the relative position of the individual captures scene, but not the relative position of the individual captures
within the composed capture. within the composed capture.
+===============+===================================+ --------------- -----------------------------------
| Capture Scene | | Capture Scene
| #1 | | #1
+===============+===================================+ VC1 AreaofCapture=(0,0,0)(9,0,0)
| VC1 | AreaofCapture=(0,0,0)(9,0,0) | (0,0,9)(9,0,9)
| | (0,0,9)(9,0,9) | VC2 AreaofCapture=(10,0,0)(19,0,0)
+---------------+-----------------------------------+ (10,0,9)(19,0,9)
| VC2 | AreaofCapture=(10,0,0)(19,0,0) | MCC1(VC1,VC2) MaxCaptures=2
| | (10,0,9)(19,0,9) | AreaofCapture=(0,0,0)(19,0,0)
+---------------+-----------------------------------+ (0,0,9)(19,0,9)
| MCC1(VC1,VC2) | MaxCaptures=2 | CSV(MCC1)
| | AreaofCapture=(0,0,0)(19,0,0) | --------------- -----------------------------------
| | (0,0,9)(19,0,9) |
+---------------+-----------------------------------+
| CSV(MCC1) | |
+---------------+-----------------------------------+
Table 2: Example of MCC and Single Media Capture Table 2: Example of MCC and Single Media Capture
Attributes Attributes
The subsections below describe the MCC-only attributes. The subsections below describe the MCC-only attributes.
7.2.1.1. Maximum Number of Captures within an MCC 7.2.1.1. Maximum Number of Captures within an MCC
The Maximum Number of Captures MCC attribute indicates the maximum The Maximum Number of Captures MCC attribute indicates the maximum
number of individual Captures that may appear in a Capture Encoding number of individual Captures that may appear in a Capture Encoding
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An index is used to represent an instance in the policy setting. An An index is used to represent an instance in the policy setting. An
index of 0 represents the most current instance of the policy, i.e., index of 0 represents the most current instance of the policy, i.e.,
the active speaker, 1 represents the previous instance, i.e., the the active speaker, 1 represents the previous instance, i.e., the
previous active speaker, and so on. previous active speaker, and so on.
The following example shows a case where the Provider provides two The following example shows a case where the Provider provides two
media streams, one showing the active speaker and a second stream media streams, one showing the active speaker and a second stream
showing the previous speaker. showing the previous speaker.
+==================+=====================+ ------------------ ---------------------
| Capture Scene #1 | | Capture Scene #1
+==================+=====================+ VC1
| VC1 | | VC2
+------------------+---------------------+ MCC1(VC1,VC2) Policy=SoundLevel:0
| VC2 | | MaxCaptures=1
+------------------+---------------------+ MCC2(VC1,VC2) Policy=SoundLevel:1
| MCC1(VC1,VC2) | Policy=SoundLevel:0 | MaxCaptures=1
| | MaxCaptures=1 | CSV(MCC1,MCC2)
+------------------+---------------------+ ------------------ ---------------------
| MCC2(VC1,VC2) | Policy=SoundLevel:1 |
| | MaxCaptures=1 |
+------------------+---------------------+
| CSV(MCC1,MCC2) | |
+------------------+---------------------+
Table 3: Example Policy MCC Attribute Table 3: Example Policy MCC Attribute
Usage Usage
7.2.1.3. Synchronization Identity 7.2.1.3. Synchronization Identity
The Synchronization Identity MCC attribute indicates how the The Synchronization Identity MCC attribute indicates how the
individual Captures in multiple MCC Captures are synchronized. To individual Captures in multiple MCC Captures are synchronized. To
indicate that the Capture Encodings associated with MCCs contain indicate that the Capture Encodings associated with MCCs contain
Captures from the same source at the same time, a Provider should set Captures from the same source at the same time, a Provider should set
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attribute. For example, when the Provider is in an MCU, it may attribute. For example, when the Provider is in an MCU, it may
determine that each separate CLUE Endpoint is a remote source of determine that each separate CLUE Endpoint is a remote source of
media. The Synchronization Identity may be used across media types, media. The Synchronization Identity may be used across media types,
i.e., to synchronize audio- and video-related MCCs. i.e., to synchronize audio- and video-related MCCs.
Without this attribute it is assumed that multiple MCCs may provide Without this attribute it is assumed that multiple MCCs may provide
content from different sources at any particular point in time. content from different sources at any particular point in time.
For example: For example:
+=======================+=====================+ ----------------------- ---------------------
| Capture Scene #1 | | Capture Scene #1
+=======================+=====================+ VC1 Description=Left
| VC1 | Description=Left | VC2 Description=Center
+-----------------------+---------------------+ VC3 Description=Right
| VC2 | Description=Center | AC1 Description=Room
+-----------------------+---------------------+ CSV(VC1,VC2,VC3)
| VC3 | Description=Right | CSV(AC1)
+-----------------------+---------------------+ ----------------------- ---------------------
| AC1 | Description=Room | Capture Scene #2
+-----------------------+---------------------+ VC4 Description=Left
| CSV(VC1,VC2,VC3) | | VC5 Description=Center
+-----------------------+---------------------+ VC6 Description=Right
| CSV(AC1) | | AC2 Description=Room
+=======================+=====================+ CSV(VC4,VC5,VC6)
| Capture Scene #2 | | CSV(AC2)
+=======================+=====================+ ----------------------- ---------------------
| VC4 | Description=Left | Capture Scene #3
+-----------------------+---------------------+ VC7
| VC5 | Description=Center | AC3
+-----------------------+---------------------+ ----------------------- ---------------------
| VC6 | Description=Right | Capture Scene #4
+-----------------------+---------------------+ VC8
| AC2 | Description=Room | AC4
+-----------------------+---------------------+ ----------------------- ---------------------
| CSV(VC4,VC5,VC6) | | Capture Scene #5
+-----------------------+---------------------+ MCC1(VC1,VC4,VC7) SynchronizationID=1
| CSV(AC2) | | MaxCaptures=1
+=======================+=====================+ MCC2(VC2,VC5,VC8) SynchronizationID=1
| Capture Scene #3 | | MaxCaptures=1
+=======================+=====================+ MCC3(VC3,VC6) MaxCaptures=1
| VC7 | | MCC4(AC1,AC2,AC3,AC4) SynchronizationID=1
+-----------------------+---------------------+ MaxCaptures=1
| AC3 | | CSV(MCC1,MCC2,MCC3)
+=======================+=====================+ CSV(MCC4)
| Capture Scene #4 | | ----------------------- ---------------------
+=======================+=====================+
| VC8 | |
+-----------------------+---------------------+
| AC4 | |
+=======================+=====================+
| Capture Scene #5 | |
+=======================+=====================+
| MCC1(VC1,VC4,VC7) | SynchronizationID=1 |
| | MaxCaptures=1 |
+-----------------------+---------------------+
| MCC2(VC2,VC5,VC8) | SynchronizationID=1 |
| | MaxCaptures=1 |
+-----------------------+---------------------+
| MCC3(VC3,VC6) | MaxCaptures=1 |
+-----------------------+---------------------+
| MCC4(AC1,AC2,AC3,AC4) | SynchronizationID=1 |
| | MaxCaptures=1 |
+-----------------------+---------------------+
| CSV(MCC1,MCC2,MCC3) | |
+-----------------------+---------------------+
| CSV(MCC4) | |
+-----------------------+---------------------+
Table 4: Example Synchronization Identity Table 4: Example Synchronization Identity
MCC Attribute Usage MCC Attribute Usage
The above Advertisement would indicate that MCC1, MCC2, MCC3, and The above Advertisement would indicate that MCC1, MCC2, MCC3, and
MCC4 make up a Capture Scene. There would be four Capture Encodings MCC4 make up a Capture Scene. There would be four Capture Encodings
(one for each MCC). Because MCC1 and MCC2 have the same (one for each MCC). Because MCC1 and MCC2 have the same
SynchronizationID, each Encoding from MCC1 and MCC2, respectively, SynchronizationID, each Encoding from MCC1 and MCC2, respectively,
would together have content from only Capture Scene 1 or only Capture would together have content from only Capture Scene 1 or only Capture
Scene 2 or the combination of VC7 and VC8 at a particular point in Scene 2 or the combination of VC7 and VC8 at a particular point in
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Transmission Set. It does not imply that the Single Media Captures Transmission Set. It does not imply that the Single Media Captures
contained in the Multiple Content Capture could all be transmitted at contained in the Multiple Content Capture could all be transmitted at
the same time. the same time.
In this example, the two Simultaneous Transmission Sets are shown in In this example, the two Simultaneous Transmission Sets are shown in
Table 5. If a Provider advertises one or more mutually exclusive Table 5. If a Provider advertises one or more mutually exclusive
Simultaneous Transmission Sets, then, for each media type, the Simultaneous Transmission Sets, then, for each media type, the
Consumer MUST ensure that it chooses Media Captures that lie wholly Consumer MUST ensure that it chooses Media Captures that lie wholly
within one of those Simultaneous Transmission Sets. within one of those Simultaneous Transmission Sets.
+===================+ -------------------
| Simultaneous Sets | Simultaneous Sets
+===================+ {VC0, VC1, VC2}
| {VC0, VC1, VC2} | {VC0, VC3, VC2}
+-------------------+ -------------------
| {VC0, VC3, VC2} |
+-------------------+
Table 5: Two Table 5: Two
Simultaneous Simultaneous
Transmission Sets Transmission Sets
A Provider OPTIONALLY can include the Simultaneous Transmission Sets A Provider OPTIONALLY can include the Simultaneous Transmission Sets
in its Advertisement. These constraints apply across all the Capture in its Advertisement. These constraints apply across all the Capture
Scenes in the Advertisement. It is a syntax-conformance requirement Scenes in the Advertisement. It is a syntax-conformance requirement
that the Simultaneous Transmission Sets MUST allow all the media that the Simultaneous Transmission Sets MUST allow all the media
Captures in any particular Capture Scene View to be used Captures in any particular Capture Scene View to be used
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encoding of the MCC. This allows an Advertiser to specify encoding encoding of the MCC. This allows an Advertiser to specify encoding
attributes associated with the Media Captures without the need to attributes associated with the Media Captures without the need to
provide an individual Capture Encoding for each of the inputs. provide an individual Capture Encoding for each of the inputs.
If an Encoding Group is assigned to a Media Capture referenced by the If an Encoding Group is assigned to a Media Capture referenced by the
MCC, it indicates that this Capture may also have an individual MCC, it indicates that this Capture may also have an individual
Capture Encoding. Capture Encoding.
For example: For example:
+==================+=================+ ------------------ -----------------
| Capture Scene #1 | | Capture Scene #1
+==================+=================+ VC1 EncodeGroupID=1
| VC1 | EncodeGroupID=1 | VC2
+------------------+-----------------+ MCC1(VC1,VC2) EncodeGroupID=2
| VC2 | | CSV(VC1)
+------------------+-----------------+ CSV(MCC1)
| MCC1(VC1,VC2) | EncodeGroupID=2 | ------------------ -----------------
+------------------+-----------------+
| CSV(VC1) | |
+------------------+-----------------+
| CSV(MCC1) | |
+------------------+-----------------+
Table 6: Example Usage of Encoding Table 6: Example Usage of Encoding
with MCC and Source Captures with MCC and Source Captures
This would indicate that VC1 may be sent as its own Capture Encoding This would indicate that VC1 may be sent as its own Capture Encoding
from EncodeGroupID=1 or that it may be sent as part of a Capture from EncodeGroupID=1 or that it may be sent as part of a Capture
Encoding from EncodeGroupID=2 along with VC2. Encoding from EncodeGroupID=2 along with VC2.
More than one Capture MAY use the same Encoding Group. More than one Capture MAY use the same Encoding Group.
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Capture Scenes: Capture Scenes:
The following table represents the Capture Scenes for this Provider. The following table represents the Capture Scenes for this Provider.
Recall that a Capture Scene is composed of alternative Capture Scene Recall that a Capture Scene is composed of alternative Capture Scene
Views covering the same spatial region. Capture Scene #1 is for the Views covering the same spatial region. Capture Scene #1 is for the
main people captures, and Capture Scene #2 is for presentation. main people captures, and Capture Scene #2 is for presentation.
Each row in the table is a separate Capture Scene View. Each row in the table is a separate Capture Scene View.
+==================+ ------------------
| Capture Scene #1 | Capture Scene #1
+==================+ VC0, VC1, VC2
| VC0, VC1, VC2 | MCC3
+------------------+ MCC4
| MCC3 | VC5
+------------------+ AC0, AC1, AC2
| MCC4 | AC3
+------------------+ ------------------
| VC5 | Capture Scene #2
+------------------+ VC6
| AC0, AC1, AC2 | AC4
+------------------+ ------------------
| AC3 |
+==================+
| Capture Scene #2 |
+==================+
| VC6 |
+------------------+
| AC4 |
+------------------+
Table 7: Example Table 7: Example
Capture Scene Views Capture Scene Views
Different Capture Scenes are distinct from each other and do not Different Capture Scenes are distinct from each other and do not
overlap. A Consumer can choose a view from each Capture Scene. In overlap. A Consumer can choose a view from each Capture Scene. In
this case, the three Captures, VC0, VC1, and VC2, are one way of this case, the three Captures, VC0, VC1, and VC2, are one way of
representing the video from the Endpoint. These three Captures representing the video from the Endpoint. These three Captures
should appear adjacent to each other. Alternatively, another way of should appear adjacent to each other. Alternatively, another way of
representing the Capture Scene is with the capture MCC3, which representing the Capture Scene is with the capture MCC3, which
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12.1.3. The MCU Case 12.1.3. The MCU Case
This section shows how an MCU might express its Capture Scenes, This section shows how an MCU might express its Capture Scenes,
intending to offer different choices for consumers that can handle intending to offer different choices for consumers that can handle
different numbers of streams. Each MCC is for video. A single Audio different numbers of streams. Each MCC is for video. A single Audio
Capture is provided for all single and multi-screen configurations Capture is provided for all single and multi-screen configurations
that can be associated (e.g., lip-synced) with any combination of that can be associated (e.g., lip-synced) with any combination of
Video Captures (the MCCs) at the consumer. Video Captures (the MCCs) at the consumer.
+==========================+==================================+ -------------------------- ----------------------------------
| Capture Scene #1 | | Capture Scene #1
+==========================+==================================+ MCC for a single-screen consumer
| MCC | for a single-screen consumer | MCC1, MCC2 for a two-screen consumer
+--------------------------+----------------------------------+ MCC3, MCC4, MCC5 for a three-screen consumer
| MCC1, MCC2 | for a two-screen consumer | MCC6, MCC7, MCC8, MCC9 for a four-screen consumer
+--------------------------+----------------------------------+ AC0 AC representing all participants
| MCC3, MCC4, MCC5 | for a three-screen consumer | CSV(MCC0)
+--------------------------+----------------------------------+ CSV(MCC1,MCC2)
| MCC6, MCC7, MCC8, MCC9 | for a four-screen consumer | CSV(MCC3,MCC4,MCC5)
+--------------------------+----------------------------------+ CSV(MCC6,MCC7,MCC8,MCC9)
| AC0 | AC representing all participants | CSV(AC0)
+--------------------------+----------------------------------+ -------------------------- ----------------------------------
| CSV(MCC0) | |
+--------------------------+----------------------------------+
| CSV(MCC1,MCC2) | |
+--------------------------+----------------------------------+
| CSV(MCC3,MCC4,MCC5) | |
+--------------------------+----------------------------------+
| CSV(MCC6,MCC7,MCC8,MCC9) | |
+--------------------------+----------------------------------+
| CSV(AC0) | |
+--------------------------+----------------------------------+
Table 8: MCU Main Capture Scenes Table 8: MCU Main Capture Scenes
If/when a presentation stream becomes active within the conference, If/when a presentation stream becomes active within the conference,
the MCU might re-advertise the available media as: the MCU might re-advertise the available media as:
+==================+======================================+ ------------------ --------------------------------------
| Capture Scene #2 | Note | Capture Scene #2 Note
+==================+======================================+ VC10 Video capture for presentation
| VC10 | Video capture for presentation | AC1 Presentation audio to accompany VC10
+------------------+--------------------------------------+ CSV(VC10)
| AC1 | Presentation audio to accompany VC10 | CSV(AC1)
+------------------+--------------------------------------+ ------------------ --------------------------------------
| CSV(VC10) | |
+------------------+--------------------------------------+
| CSV(AC1) | |
+------------------+--------------------------------------+
Table 9: MCU Presentation Capture Scene Table 9: MCU Presentation Capture Scene
12.2. Media Consumer Behavior 12.2. Media Consumer Behavior
This section gives an example of how a Media Consumer might behave This section gives an example of how a Media Consumer might behave
when deciding how to request streams from the three-screen endpoint when deciding how to request streams from the three-screen endpoint
described in the previous section. described in the previous section.
The receive side of a call needs to balance its requirements (based The receive side of a call needs to balance its requirements (based
skipping to change at line 2404 skipping to change at line 2339
MCU is responsible for making these unique in the outgoing MCU is responsible for making these unique in the outgoing
advertisement. advertisement.
12.3.1. Single Media Captures and MCC in the Same Advertisement 12.3.1. Single Media Captures and MCC in the Same Advertisement
Four endpoints are involved in a Conference where CLUE is used. An Four endpoints are involved in a Conference where CLUE is used. An
MCU acts as a middlebox between the endpoints with a CLUE channel MCU acts as a middlebox between the endpoints with a CLUE channel
between each endpoint and the MCU. The MCU receives the following between each endpoint and the MCU. The MCU receives the following
Advertisements. Advertisements.
+==================+================================+ ------------------ --------------------------------
| Capture Scene #1 | Description=AustralianConfRoom | Capture Scene #1 Description=AustralianConfRoom
+==================+================================+ VC1 Description=Audience
| VC1 | Description=Audience | EncodeGroupID=1
| | EncodeGroupID=1 | CSV(VC1)
+------------------+--------------------------------+ ------------------ --------------------------------
| CSV(VC1) | |
+------------------+--------------------------------+
Table 10: Advertisement Received from Endpoint A Table 10: Advertisement Received from Endpoint A
+==================+===========================+ ------------------ ---------------------------
| Capture Scene #1 | Description=ChinaConfRoom | Capture Scene #1 Description=ChinaConfRoom
+==================+===========================+ VC1 Description=Speaker
| VC1 | Description=Speaker | EncodeGroupID=1
| | EncodeGroupID=1 | VC2 Description=Audience
+------------------+---------------------------+ EncodeGroupID=1
| VC2 | Description=Audience | CSV(VC1, VC2)
| | EncodeGroupID=1 | ------------------ ---------------------------
+------------------+---------------------------+
| CSV(VC1, VC2) | |
+------------------+---------------------------+
Table 11: Advertisement Received from Endpoint B Table 11: Advertisement Received from Endpoint B
Note: Endpoint B indicates that it sends two streams. Note: Endpoint B indicates that it sends two streams.
+==================+=========================+ ------------------ -------------------------
| Capture Scene #1 | Description=USAConfRoom | Capture Scene #1 Description=USAConfRoom
+==================+=========================+ VC1 Description=Audience
| VC1 | Description=Audience | EncodeGroupID=1
| | EncodeGroupID=1 | CSV(VC1)
+------------------+-------------------------+ ------------------ -------------------------
| CSV(VC1) | |
+------------------+-------------------------+
Table 12: Advertisement Received from Table 12: Advertisement Received from
Endpoint C Endpoint C
If the MCU wanted to provide a Multiple Content Captures containing a If the MCU wanted to provide a Multiple Content Captures containing a
round-robin switched view of the audience from the three endpoints round-robin switched view of the audience from the three endpoints
and the speaker, it could construct the following advertisement: and the speaker, it could construct the following advertisement:
+=======================+====================================+ ----------------------- ------------------------------------
| Capture Scene #1 | Description=AustralianConfRoom | Capture Scene #1 Description=AustralianConfRoom
+=======================+====================================+ VC1 Description=Audience
| VC1 | Description=Audience | CSV(VC1)
+-----------------------+------------------------------------+ ----------------------- ------------------------------------
| CSV(VC1) | | Capture Scene #2 Description=ChinaConfRoom
+=======================+====================================+ VC2 Description=Speaker
| Capture Scene #2 | Description=ChinaConfRoom | VC3 Description=Audience
+=======================+====================================+ CSV(VC2, VC3)
| VC2 | Description=Speaker | ----------------------- ------------------------------------
+-----------------------+------------------------------------+ Capture Scene #3 Description=USAConfRoom
| VC3 | Description=Audience | VC4 Description=Audience
+-----------------------+------------------------------------+ CSV(VC4)
| CSV(VC2, VC3) | | ----------------------- ------------------------------------
+=======================+====================================+ Capture Scene #4
| Capture Scene #3 | Description=USAConfRoom | MCC1(VC1,VC2,VC3,VC4) Policy=RoundRobin:1
+=======================+====================================+ MaxCaptures=1
| VC4 | Description=Audience | EncodingGroup=1
+-----------------------+------------------------------------+ CSV(MCC1)
| CSV(VC4) | | ----------------------- ------------------------------------
+=======================+====================================+
| Capture Scene #4 | |
+=======================+====================================+
| MCC1(VC1,VC2,VC3,VC4) | Policy=RoundRobin:1 |
| | MaxCaptures=1 |
| | EncodingGroup=1 |
+-----------------------+------------------------------------+
| CSV(MCC1) | |
+-----------------------+------------------------------------+
Table 13: Advertisement Sent to Endpoint F - One Encoding Table 13: Advertisement Sent to Endpoint F - One Encoding
Alternatively, if the MCU wanted to provide the speaker as one media Alternatively, if the MCU wanted to provide the speaker as one media
stream and the audiences as another, it could assign an encoding stream and the audiences as another, it could assign an encoding
group to VC2 in Capture Scene 2 and provide a CSV in Capture Scene #4 group to VC2 in Capture Scene 2 and provide a CSV in Capture Scene #4
as per the example below. as per the example below.
+===================+======================================+ ------------------- --------------------------------------
| Capture Scene #1 | Description=AustralianConfRoom | Capture Scene #1 Description=AustralianConfRoom
+===================+======================================+ VC1 Description=Audience
| VC1 | Description=Audience | CSV(VC1)
+-------------------+--------------------------------------+ ------------------- --------------------------------------
| CSV(VC1) | | Capture Scene #2 Description=ChinaConfRoom
+===================+======================================+ VC2 Description=Speaker
| Capture Scene #2 | Description=ChinaConfRoom | EncodingGroup=1
+===================+======================================+ VC3 Description=Audience
| VC2 | Description=Speaker | CSV(VC2, VC3)
| | EncodingGroup=1 | ------------------- --------------------------------------
+-------------------+--------------------------------------+ Capture Scene #3 Description=USAConfRoom
| VC3 | Description=Audience | VC4 Description=Audience
+-------------------+--------------------------------------+ CSV(VC4)
| CSV(VC2, VC3) | | ------------------- --------------------------------------
+===================+======================================+ Capture Scene #4
| Capture Scene #3 | Description=USAConfRoom | MCC1(VC1,VC3,VC4) Policy=RoundRobin:1
+===================+======================================+ MaxCaptures=1
| VC4 | Description=Audience | EncodingGroup=1
+-------------------+--------------------------------------+ AllowSubset=True
| CSV(VC4) | | MCC2(VC2) MaxCaptures=1
+===================+======================================+ EncodingGroup=1
| Capture Scene #4 | | CSV2(MCC1,MCC2)
+===================+======================================+ ------------------- --------------------------------------
| MCC1(VC1,VC3,VC4) | Policy=RoundRobin:1 |
| | MaxCaptures=1 |
| | EncodingGroup=1 |
| | AllowSubset=True |
+-------------------+--------------------------------------+
| MCC2(VC2) | MaxCaptures=1 |
| | EncodingGroup=1 |
+-------------------+--------------------------------------+
| CSV2(MCC1,MCC2) | |
+-------------------+--------------------------------------+
Table 14: Advertisement Sent to Endpoint F - Two Encodings Table 14: Advertisement Sent to Endpoint F - Two Encodings
Therefore, a Consumer could choose whether or not to have a separate Therefore, a Consumer could choose whether or not to have a separate
speaker-related stream and could choose which endpoints to see. If speaker-related stream and could choose which endpoints to see. If
it wanted the second stream but not the Australian conference room, it wanted the second stream but not the Australian conference room,
it could indicate the following captures in the Configure message: it could indicate the following captures in the Configure message:
+---------------+----------+ --------------- ----------
| MCC1(VC3,VC4) | Encoding | MCC1(VC3,VC4) Encoding
+---------------+----------+ VC2 Encoding
| VC2 | Encoding | --------------- ----------
+---------------+----------+
Table 15: MCU Case: Table 15: MCU Case:
Consumer Response Consumer Response
12.3.2. Several MCCs in the Same Advertisement 12.3.2. Several MCCs in the Same Advertisement
Multiple MCCs can be used where multiple streams are used to carry Multiple MCCs can be used where multiple streams are used to carry
media from multiple endpoints. For example: media from multiple endpoints. For example:
A conference has three endpoints D, E, and F. Each endpoint has A conference has three endpoints D, E, and F. Each endpoint has
three video captures covering the left, middle, and right regions of three video captures covering the left, middle, and right regions of
each conference room. The MCU receives the following advertisements each conference room. The MCU receives the following advertisements
from D and E. from D and E.
+==================+================================+ ------------------ --------------------------------
| Capture Scene #1 | Description=AustralianConfRoom | Capture Scene #1 Description=AustralianConfRoom
+==================+================================+ VC1 CaptureArea=Left
| VC1 | CaptureArea=Left | EncodingGroup=1
+------------------+--------------------------------+ VC2 CaptureArea=Center
| | EncodingGroup=1 | EncodingGroup=1
+------------------+--------------------------------+ VC3 CaptureArea=Right
| VC2 | CaptureArea=Center | EncodingGroup=1
+------------------+--------------------------------+ CSV(VC1,VC2,VC3)
| | EncodingGroup=1 | ------------------ --------------------------------
+------------------+--------------------------------+
| VC3 | CaptureArea=Right |
+------------------+--------------------------------+
| | EncodingGroup=1 |
+------------------+--------------------------------+
| CSV(VC1,VC2,VC3) | |
+------------------+--------------------------------+
Table 16: Advertisement Received from Endpoint D Table 16: Advertisement Received from Endpoint D
+==================+===========================+ ------------------ ---------------------------
| Capture Scene #1 | Description=ChinaConfRoom | Capture Scene #1 Description=ChinaConfRoom
+==================+===========================+ VC1 CaptureArea=Left
| VC1 | CaptureArea=Left | EncodingGroup=1
+------------------+---------------------------+ VC2 CaptureArea=Center
| | EncodingGroup=1 | EncodingGroup=1
+------------------+---------------------------+ VC3 CaptureArea=Right
| VC2 | CaptureArea=Center | EncodingGroup=1
+------------------+---------------------------+ CSV(VC1,VC2,VC3)
| | EncodingGroup=1 | ------------------ ---------------------------
+------------------+---------------------------+
| VC3 | CaptureArea=Right |
+------------------+---------------------------+
| | EncodingGroup=1 |
+------------------+---------------------------+
| CSV(VC1,VC2,VC3) | |
+------------------+---------------------------+
Table 17: Advertisement Received from Endpoint E Table 17: Advertisement Received from Endpoint E
The MCU wants to offer Endpoint F three Capture Encodings. Each The MCU wants to offer Endpoint F three Capture Encodings. Each
Capture Encoding would contain all the Captures from either Endpoint Capture Encoding would contain all the Captures from either Endpoint
D or Endpoint E, depending on the active speaker. The MCU sends the D or Endpoint E, depending on the active speaker. The MCU sends the
following Advertisement: following Advertisement:
+=====================+==========================================+ --------------------- ------------------------------------------
| Capture Scene #1 | Description=AustralianConfRoom | Capture Scene #1 Description=AustralianConfRoom
+=====================+==========================================+ VC1
| VC1 | | VC2
+---------------------+------------------------------------------+ VC3
| VC2 | | CSV(VC1,VC2,VC3)
+---------------------+------------------------------------------+ --------------------- ------------------------------------------
| VC3 | | Capture Scene #2 Description=ChinaConfRoom
+---------------------+------------------------------------------+ VC4
| CSV(VC1,VC2,VC3) | | VC5
+=====================+==========================================+ VC6
| Capture Scene #2 | Description=ChinaConfRoom | CSV(VC4,VC5,VC6)
+=====================+==========================================+ --------------------- ------------------------------------------
| VC4 | | Capture Scene #3
+---------------------+------------------------------------------+ MCC1(VC1,VC4) CaptureArea=Left
| VC5 | | MaxCaptures=1
+---------------------+------------------------------------------+ SynchronizationID=1
| VC6 | | EncodingGroup=1
+---------------------+------------------------------------------+ MCC2(VC2,VC5) CaptureArea=Center
| CSV(VC4,VC5,VC6) | | MaxCaptures=1
+=====================+==========================================+ SynchronizationID=1
| Capture Scene #3 | | EncodingGroup=1
+=====================+==========================================+ MCC3(VC3,VC6) CaptureArea=Right
| MCC1(VC1,VC4) | CaptureArea=Left | MaxCaptures=1
| | MaxCaptures=1 | SynchronizationID=1
| | SynchronizationID=1 | EncodingGroup=1
| | EncodingGroup=1 | CSV(MCC1,MCC2,MCC3)
+---------------------+------------------------------------------+ --------------------- ------------------------------------------
| MCC2(VC2,VC5) | CaptureArea=Center |
| | MaxCaptures=1 |
| | SynchronizationID=1 |
| | EncodingGroup=1 |
+---------------------+------------------------------------------+
| MCC3(VC3,VC6) | CaptureArea=Right |
| | MaxCaptures=1 |
| | SynchronizationID=1 |
| | EncodingGroup=1 |
+---------------------+------------------------------------------+
| CSV(MCC1,MCC2,MCC3) | |
+---------------------+------------------------------------------+
Table 18: Advertisement Sent to Endpoint F Table 18: Advertisement Sent to Endpoint F
12.3.3. Heterogeneous Conference with Switching and Composition 12.3.3. Heterogeneous Conference with Switching and Composition
Consider a conference between endpoints with the following Consider a conference between endpoints with the following
characteristics: characteristics:
Endpoint A - 4 screens, 3 cameras Endpoint A - 4 screens, 3 cameras
skipping to change at line 2715 skipping to change at line 2597
One of the points of this example is that endpoints A and B each want One of the points of this example is that endpoints A and B each want
to receive three capture encodings for their large display areas, and to receive three capture encodings for their large display areas, and
nine encodings for their smaller areas. A and B are be able to each nine encodings for their smaller areas. A and B are be able to each
send the same Configure message to the MCU, and each receive the same send the same Configure message to the MCU, and each receive the same
conceptual Media Captures from the MCU. The differences are in how conceptual Media Captures from the MCU. The differences are in how
they are rendered and are purely a local matter at A and B. they are rendered and are purely a local matter at A and B.
The Advertisements for such a scenario are described below. The Advertisements for such a scenario are described below.
+=====================+========================+ --------------------- ------------------------
| Capture Scene #1 | Description=Endpoint x | Capture Scene #1 Description=Endpoint x
+=====================+========================+ VC1 EncodingGroup=1
| VC1 | EncodingGroup=1 | VC2 EncodingGroup=1
+---------------------+------------------------+ VC3 EncodingGroup=1
| VC2 | EncodingGroup=1 | AC1 EncodingGroup=2
+---------------------+------------------------+ CSV1(VC1, VC2, VC3)
| VC3 | EncodingGroup=1 | CSV2(AC1)
+---------------------+------------------------+ --------------------- ------------------------
| AC1 | EncodingGroup=2 |
+---------------------+------------------------+
| CSV1(VC1, VC2, VC3) | |
+---------------------+------------------------+
| CSV2(AC1) | |
+---------------------+------------------------+
Table 19: Advertisement Received at the MCU Table 19: Advertisement Received at the MCU
from Endpoints A to D from Endpoints A to D
+==================+========================+ ------------------ ------------------------
| Capture Scene #1 | Description=Endpoint y | Capture Scene #1 Description=Endpoint y
+==================+========================+ VC1 EncodingGroup=1
| VC1 | EncodingGroup=1 | AC1 EncodingGroup=2
+------------------+------------------------+ CSV1(VC1)
| AC1 | EncodingGroup=2 | CSV2(AC1)
+------------------+------------------------+ ------------------ ------------------------
| CSV1(VC1) | |
+------------------+------------------------+
| CSV2(AC1) | |
+------------------+------------------------+
Table 20: Advertisement Received at the Table 20: Advertisement Received at the
MCU from Endpoints E to G MCU from Endpoints E to G
Rather than considering what is displayed, CLUE concentrates more on Rather than considering what is displayed, CLUE concentrates more on
what the MCU sends. The MCU doesn't know anything about the number what the MCU sends. The MCU doesn't know anything about the number
of screens an endpoint has. of screens an endpoint has.
As Endpoints A to D each advertise that three Captures make up a As Endpoints A to D each advertise that three Captures make up a
Capture Scene, the MCU offers these in a "site switching" mode. That Capture Scene, the MCU offers these in a "site switching" mode. That
is, there are three Multiple Content Captures (and Capture Encodings) is, there are three Multiple Content Captures (and Capture Encodings)
each switching between Endpoints. The MCU switches in the applicable each switching between Endpoints. The MCU switches in the applicable
media into the stream based on voice activity. Endpoint A will not media into the stream based on voice activity. Endpoint A will not
see a capture from itself. see a capture from itself.
Using the MCC concept, the MCU would send the following Advertisement Using the MCC concept, the MCU would send the following Advertisement
to Endpoint A: to Endpoint A:
+=====================+========================+ --------------------- ------------------------
| Capture Scene #1 | Description=Endpoint B | Capture Scene #1 Description=Endpoint B
+=====================+========================+ VC4 CaptureArea=Left
| VC4 | CaptureArea=Left | VC5 CaptureArea=Center
+---------------------+------------------------+ VC6 CaptureArea=Right
| VC5 | CaptureArea=Center | AC1
+---------------------+------------------------+ CSV(VC4,VC5,VC6)
| VC6 | CaptureArea=Right | CSV(AC1)
+---------------------+------------------------+ --------------------- ------------------------
| AC1 | | Capture Scene #2 Description=Endpoint C
+---------------------+------------------------+ VC7 CaptureArea=Left
| CSV(VC4,VC5,VC6) | | VC8 CaptureArea=Center
+---------------------+------------------------+ VC9 CaptureArea=Right
| CSV(AC1) | | AC2
+=====================+========================+ CSV(VC7,VC8,VC9)
| Capture Scene #2 | Description=Endpoint C | CSV(AC2)
+=====================+========================+ --------------------- ------------------------
| VC7 | CaptureArea=Left | Capture Scene #3 Description=Endpoint D
+---------------------+------------------------+ VC10 CaptureArea=Left
| VC8 | CaptureArea=Center | VC11 CaptureArea=Center
+---------------------+------------------------+ VC12 CaptureArea=Right
| VC9 | CaptureArea=Right | AC3
+---------------------+------------------------+ CSV(VC10,VC11,VC12)
| AC2 | | CSV(AC3)
+---------------------+------------------------+ --------------------- ------------------------
| CSV(VC7,VC8,VC9) | | Capture Scene #4 Description=Endpoint E
+---------------------+------------------------+ VC13
| CSV(AC2) | | AC4
+=====================+========================+ CSV(VC13)
| Capture Scene #3 | Description=Endpoint D | CSV(AC4)
+=====================+========================+ --------------------- ------------------------
| VC10 | CaptureArea=Left | Capture Scene #5 Description=Endpoint F
+---------------------+------------------------+ VC14
| VC11 | CaptureArea=Center | AC5
+---------------------+------------------------+ CSV(VC14)
| VC12 | CaptureArea=Right | CSV(AC5)
+---------------------+------------------------+ --------------------- ------------------------
| AC3 | | Capture Scene #6 Description=Endpoint G
+---------------------+------------------------+ VC15
| CSV(VC10,VC11,VC12) | | AC6
+---------------------+------------------------+ CSV(VC15)
| CSV(AC3) | | CSV(AC6)
+=====================+========================+ --------------------- ------------------------
| Capture Scene #4 | Description=Endpoint E |
+=====================+========================+
| VC13 | |
+---------------------+------------------------+
| AC4 | |
+---------------------+------------------------+
| CSV(VC13) | |
+---------------------+------------------------+
| CSV(AC4) | |
+=====================+========================+
| Capture Scene #5 | Description=Endpoint F |
+=====================+========================+
| VC14 | |
+---------------------+------------------------+
| AC5 | |
+---------------------+------------------------+
| CSV(VC14) | |
+---------------------+------------------------+
| CSV(AC5) | |
+=====================+========================+
| Capture Scene #6 | Description=Endpoint G |
+=====================+========================+
| VC15 | |
+---------------------+------------------------+
| AC6 | |
+---------------------+------------------------+
| CSV(VC15) | |
+---------------------+------------------------+
| CSV(AC6) | |
+---------------------+------------------------+
Table 21: Advertisement Sent to Endpoint A - Table 21: Advertisement Sent to Endpoint A -
Source Part Source Part
The above part of the Advertisement presents information about the The above part of the Advertisement presents information about the
sources to the MCC. The information is effectively the same as the sources to the MCC. The information is effectively the same as the
received Advertisements, except that there are no Capture Encodings received Advertisements, except that there are no Capture Encodings
associated with them and the identities have been renumbered. associated with them and the identities have been renumbered.
In addition to the source Capture information, the MCU advertises In addition to the source Capture information, the MCU advertises
site switching of Endpoints B to G in three streams. site switching of Endpoints B to G in three streams.
+===================+===============================================+ ------------------- -----------------------------------------------
| Capture Scene #7 | Description=Output3streammix | Capture Scene #7 Description=Output3streammix
+===================+===============================================+ MCC1(VC4,VC7,VC10, CaptureArea=Left
|MCC1(VC4,VC7,VC10, | CaptureArea=Left | VC13) MaxCaptures=1
| VC13) | MaxCaptures=1 | SynchronizationID=1
| | SynchronizationID=1 | Policy=SoundLevel:0
| | Policy=SoundLevel:0 | EncodingGroup=1
| | EncodingGroup=1 | MCC2(VC5,VC8,VC11, CaptureArea=Center
+-------------------+-----------------------------------------------+ VC14) MaxCaptures=1
|MCC2(VC5,VC8,VC11, | CaptureArea=Center | SynchronizationID=1
| VC14) | MaxCaptures=1 | Policy=SoundLevel:0
| | SynchronizationID=1 | EncodingGroup=1
| | Policy=SoundLevel:0 | MCC3(VC6,VC9,VC12, CaptureArea=Right
| | EncodingGroup=1 | VC15) MaxCaptures=1
+-------------------+-----------------------------------------------+ SynchronizationID=1
|MCC3(VC6,VC9,VC12, | CaptureArea=Right | Policy=SoundLevel:0
| VC15) | MaxCaptures=1 | EncodingGroup=1
| | SynchronizationID=1 | MCC4() (for audio) CaptureArea=whole scene
| | Policy=SoundLevel:0 | MaxCaptures=1
| | EncodingGroup=1 | Policy=SoundLevel:0
+-------------------+-----------------------------------------------+ EncodingGroup=2
|MCC4() (for audio) | CaptureArea=whole scene | MCC5() (for audio) CaptureArea=whole scene
| | MaxCaptures=1 | MaxCaptures=1
| | Policy=SoundLevel:0 | Policy=SoundLevel:1
| | EncodingGroup=2 | EncodingGroup=2
+-------------------+-----------------------------------------------+ MCC6() (for audio) CaptureArea=whole scene
|MCC5() (for audio) | CaptureArea=whole scene | MaxCaptures=1
| | MaxCaptures=1 | Policy=SoundLevel:2
| | Policy=SoundLevel:1 | EncodingGroup=2
| | EncodingGroup=2 | MCC7() (for audio) CaptureArea=whole scene
+-------------------+-----------------------------------------------+ MaxCaptures=1
|MCC6() (for audio) | CaptureArea=whole scene | Policy=SoundLevel:3
| | MaxCaptures=1 | EncodingGroup=2
| | Policy=SoundLevel:2 | CSV(MCC1,MCC2,MCC3)
| | EncodingGroup=2 | CSV(MCC4,MCC5,MCC6,
+-------------------+-----------------------------------------------+ MCC7)
|MCC7() (for audio) | CaptureArea=whole scene | ------------------- -----------------------------------------------
| | MaxCaptures=1 |
| | Policy=SoundLevel:3 |
| | EncodingGroup=2 |
+-------------------+-----------------------------------------------+
|CSV(MCC1,MCC2,MCC3)| |
+-------------------+-----------------------------------------------+
|CSV(MCC4,MCC5,MCC6,| |
| MCC7) | |
+-------------------+-----------------------------------------------+
Table 22: Advertisement Sent to Endpoint A - Switching Part Table 22: Advertisement Sent to Endpoint A - Switching Part
The above part describes the three main switched streams that relate The above part describes the three main switched streams that relate
to site switching. MaxCaptures=1 indicates that only one Capture to site switching. MaxCaptures=1 indicates that only one Capture
from the MCC is sent at a particular time. SynchronizationID=1 from the MCC is sent at a particular time. SynchronizationID=1
indicates that the source sending is synchronized. The provider can indicates that the source sending is synchronized. The provider can
choose to group together VC13, VC14, and VC15 for the purpose of choose to group together VC13, VC14, and VC15 for the purpose of
switching according to the SynchronizationID. Therefore, when the switching according to the SynchronizationID. Therefore, when the
provider switches one of them into an MCC, it can also switch the provider switches one of them into an MCC, it can also switch the
skipping to change at line 2916 skipping to change at line 2749
All the audio for the conference is included in Scene #7. There All the audio for the conference is included in Scene #7. There
isn't necessarily a one-to-one relation between any audio capture and isn't necessarily a one-to-one relation between any audio capture and
video capture in this scene. Typically, a change in the loudest video capture in this scene. Typically, a change in the loudest
talker will cause the MCU to switch the audio streams more quickly talker will cause the MCU to switch the audio streams more quickly
than switching video streams. than switching video streams.
The MCU can also supply nine media streams showing the active and The MCU can also supply nine media streams showing the active and
previous eight speakers. It includes the following in the previous eight speakers. It includes the following in the
Advertisement: Advertisement:
+========================+===========================+ ------------------------ ---------------------------
| Capture Scene #8 | Description=Output9stream | Capture Scene #8 Description=Output9stream
+========================+===========================+ MCC8(VC4,VC5,VC6,VC7, MaxCaptures=1
| MCC8(VC4,VC5,VC6,VC7, | MaxCaptures=1 | VC8,VC9,VC10,VC11, Policy=SoundLevel:0
| VC8,VC9,VC10,VC11, | Policy=SoundLevel:0 | VC12,VC13,VC14,VC15) EncodingGroup=1
| VC12,VC13,VC14,VC15) | EncodingGroup=1 | MCC9(VC4,VC5,VC6,VC7, MaxCaptures=1
+------------------------+---------------------------+ VC8,VC9,VC10,VC11, Policy=SoundLevel:1
| MCC9(VC4,VC5,VC6,VC7, | MaxCaptures=1 | VC12,VC13,VC14,VC15) EncodingGroup=1
| VC8,VC9,VC10,VC11, | Policy=SoundLevel:1 | ------------------------ ---------------------------
| VC12,VC13,VC14,VC15) | EncodingGroup=1 | to to
+========================+===========================+ MCC16(VC4,VC5,VC6,VC7, MaxCaptures=1
| to | to | VC8,VC9,VC10,VC11, Policy=SoundLevel:8
+========================+===========================+ VC12,VC13,VC14,VC15) EncodingGroup=1
| MCC16(VC4,VC5,VC6,VC7, | MaxCaptures=1 | CSV(MCC8,MCC9,MCC10,
| VC8,VC9,VC10,VC11, | Policy=SoundLevel:8 | MCC11,MCC12,MCC13,
| VC12,VC13,VC14,VC15) | EncodingGroup=1 | MCC14,MCC15,MCC16)
+------------------------+---------------------------+ ------------------------ ---------------------------
| CSV(MCC8,MCC9,MCC10, | |
| MCC11,MCC12,MCC13, | |
| MCC14,MCC15,MCC16) | |
+------------------------+---------------------------+
Table 23: Advertisement Sent to Endpoint A - Table 23: Advertisement Sent to Endpoint A -
9 Switched Part 9 Switched Part
The above part indicates that there are nine capture encodings. Each The above part indicates that there are nine capture encodings. Each
of the Capture Encodings may contain any captures from any source of the Capture Encodings may contain any captures from any source
site with a maximum of one Capture at a time. Which Capture is site with a maximum of one Capture at a time. Which Capture is
present is determined by the policy. The MCCs in this scene do not present is determined by the policy. The MCCs in this scene do not
have any spatial attributes. have any spatial attributes.
Note: The Provider alternatively could provide each of the MCCs above Note: The Provider alternatively could provide each of the MCCs above
in its own Capture Scene. in its own Capture Scene.
If the MCU wanted to provide a composed Capture Encoding containing If the MCU wanted to provide a composed Capture Encoding containing
all of the nine captures, it could advertise in addition: all of the nine captures, it could advertise in addition:
+========================+=======================+ ------------------------ -----------------------
| Capture Scene #9 | Description=NineTiles | Capture Scene #9 Description=NineTiles
+========================+=======================+ MCC13(MCC8,MCC9,MCC10, MaxCaptures=9
| MCC13(MCC8,MCC9,MCC10, | MaxCaptures=9 | MCC11,MCC12,MCC13, EncodingGroup=1
| MCC11,MCC12,MCC13, | EncodingGroup=1 | MCC14,MCC15,MCC16)
| MCC14,MCC15,MCC16) | | CSV(MCC13)
+------------------------+-----------------------+ ------------------------ -----------------------
| CSV(MCC13) | |
+------------------------+-----------------------+
Table 24: Advertisement Sent to Endpoint A - Table 24: Advertisement Sent to Endpoint A -
9 Composed Part 9 Composed Part
As MaxCaptures is 9, it indicates that the capture encoding contains As MaxCaptures is 9, it indicates that the capture encoding contains
information from nine sources at a time. information from nine sources at a time.
The Advertisement to Endpoint B is identical to the above, other than The Advertisement to Endpoint B is identical to the above, other than
the fact that captures from Endpoint A would be added and the the fact that captures from Endpoint A would be added and the
captures from Endpoint B would be removed. Whether the Captures are captures from Endpoint B would be removed. Whether the Captures are
skipping to change at line 3008 skipping to change at line 2835
Endpoint C - 1 screen, 1 camera Endpoint C - 1 screen, 1 camera
This example focuses on what the user at Endpoint C sees. The user This example focuses on what the user at Endpoint C sees. The user
would like to see the video capture of the current talker, without would like to see the video capture of the current talker, without
composing it with any other video capture. In this example, Endpoint composing it with any other video capture. In this example, Endpoint
C is capable of receiving only a single video stream. The following C is capable of receiving only a single video stream. The following
tables describe advertisements from Endpoints A and B to the MCU, and tables describe advertisements from Endpoints A and B to the MCU, and
from the MCU to Endpoint C, that can be used to accomplish this. from the MCU to Endpoint C, that can be used to accomplish this.
+===================+===================================+ ------------------- -----------------------------------
| Capture Scene #1 | Description=Endpoint x | Capture Scene #1 Description=Endpoint x
+===================+===================================+ VC1 CaptureArea=Left
| VC1 | CaptureArea=Left | EncodingGroup=1
| | EncodingGroup=1 | VC2 CaptureArea=Center
+-------------------+-----------------------------------+ EncodingGroup=1
| VC2 | CaptureArea=Center | VC3 CaptureArea=Right
| | EncodingGroup=1 | EncodingGroup=1
+-------------------+-----------------------------------+ MCC1(VC1,VC2,VC3) MaxCaptures=1
| VC3 | CaptureArea=Right | CaptureArea=whole scene
| | EncodingGroup=1 | Policy=SoundLevel:0
+-------------------+-----------------------------------+ EncodingGroup=1
| MCC1(VC1,VC2,VC3) | MaxCaptures=1 | AC1 CaptureArea=whole scene
| | CaptureArea=whole scene | EncodingGroup=2
| | Policy=SoundLevel:0 | CSV1(VC1, VC2,
| | EncodingGroup=1 | VC3)
+-------------------+-----------------------------------+ CSV2(MCC1)
| AC1 | CaptureArea=whole scene | CSV3(AC1)
| | EncodingGroup=2 | ------------------- -----------------------------------
+-------------------+-----------------------------------+
| CSV1(VC1, VC2, | |
| VC3) | |
+-------------------+-----------------------------------+
| CSV2(MCC1) | |
+-------------------+-----------------------------------+
| CSV3(AC1) | |
+-------------------+-----------------------------------+
Table 25: Advertisement Received at the MCU from Table 25: Advertisement Received at the MCU from
Endpoints A and B Endpoints A and B
Endpoints A and B are advertising each individual video capture, and Endpoints A and B are advertising each individual video capture, and
also a switched capture MCC1 that switches between the other three also a switched capture MCC1 that switches between the other three
based on who is the active talker. These endpoints do not advertise based on who is the active talker. These endpoints do not advertise
distinct audio captures associated with each individual video distinct audio captures associated with each individual video
capture, so it would be impossible for the MCU (as a media consumer) capture, so it would be impossible for the MCU (as a media consumer)
to make its own determination of which video capture is the active to make its own determination of which video capture is the active
talker based just on information in the audio streams. talker based just on information in the audio streams.
+======================+==========================================+ ---------------------- ------------------------------------------
| Capture Scene #1 | Description=conference | Capture Scene #1 Description=conference
+======================+==========================================+ MCC1() CaptureArea=Left
| MCC1() | CaptureArea=Left | MaxCaptures=1
| | MaxCaptures=1 | SynchronizationID=1
| | SynchronizationID=1 | Policy=SoundLevel:0
| | Policy=SoundLevel:0 | EncodingGroup=1
| | EncodingGroup=1 | MCC2() CaptureArea=Center
+----------------------+------------------------------------------+ MaxCaptures=1
| MCC2() | CaptureArea=Center | SynchronizationID=1
| | MaxCaptures=1 | Policy=SoundLevel:0
| | SynchronizationID=1 | EncodingGroup=1
| | Policy=SoundLevel:0 | MCC3() CaptureArea=Right
| | EncodingGroup=1 | MaxCaptures=1
+----------------------+------------------------------------------+ SynchronizationID=1
| MCC3() | CaptureArea=Right | Policy=SoundLevel:0
| | MaxCaptures=1 | EncodingGroup=1
| | SynchronizationID=1 | MCC4() CaptureArea=whole scene
| | Policy=SoundLevel:0 | MaxCaptures=1
| | EncodingGroup=1 | Policy=SoundLevel:0
+----------------------+------------------------------------------+ EncodingGroup=1
| MCC4() | CaptureArea=whole scene | MCC5() (for audio) CaptureArea=whole scene
| | MaxCaptures=1 | MaxCaptures=1
| | Policy=SoundLevel:0 | Policy=SoundLevel:0
| | EncodingGroup=1 | EncodingGroup=2
+----------------------+------------------------------------------+ MCC6() (for audio) CaptureArea=whole scene
| MCC5() (for audio) | CaptureArea=whole scene | MaxCaptures=1
| | MaxCaptures=1 | Policy=SoundLevel:1
| | Policy=SoundLevel:0 | EncodingGroup=2
| | EncodingGroup=2 | CSV1(MCC1,MCC2,MCC3)
+----------------------+------------------------------------------+ CSV2(MCC4)
| MCC6() (for audio) | CaptureArea=whole scene | CSV3(MCC5,MCC6)
| | MaxCaptures=1 | ---------------------- ------------------------------------------
| | Policy=SoundLevel:1 |
| | EncodingGroup=2 |
+----------------------+------------------------------------------+
| CSV1(MCC1,MCC2,MCC3) | |
+----------------------+------------------------------------------+
| CSV2(MCC4) | |
+----------------------+------------------------------------------+
| CSV3(MCC5,MCC6) | |
+----------------------+------------------------------------------+
Table 26: Advertisement Sent from the MCU to Endpoint C Table 26: Advertisement Sent from the MCU to Endpoint C
The MCU advertises one scene, with four video MCCs. Three of them in The MCU advertises one scene, with four video MCCs. Three of them in
CSV1 give a left, center, and right view of the conference, with site CSV1 give a left, center, and right view of the conference, with site
switching. MCC4 provides a single video capture representing a view switching. MCC4 provides a single video capture representing a view
of the whole conference. The MCU intends for MCC4 to be switched of the whole conference. The MCU intends for MCC4 to be switched
between all the other original source captures. In this example, between all the other original source captures. In this example,
advertisement of the MCU is not giving all the information about all advertisement of the MCU is not giving all the information about all
the other endpoints' scenes and which of those captures are included the other endpoints' scenes and which of those captures are included
 End of changes. 26 change blocks. 
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