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Multiple-zone audio management - reference system design
Next Meeting - Thursday
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09 April - 11:30am CET
Zoom dial-in
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- reference system design: audio control inside or outside AA
- Audio HAL project workplan
- GENIVI Audio Manager Q&A
- AOB
Thursday 02 April - 11:30am CET (AUDIO_HAL_CW14)
Participants
Philippe Robin Gunnar Andersson Piotr Krawczyk Unknown User (bartoszbialek) Unknown User (wassim.filali) Andrii Chepurnyi Unknown User (niskandar) @Henrik
Agenda
- Slides from Wassim about the two models inside and outside of AA
- discussion of the cases/features that we are trying to solve
- checking the Audio Manager to decide whether or not it needs an update
Minutes
- 2 strategies or options:
- android provides sources and sinks
- Android controls the complete systems
- We will not discuss the need to have such options
- Basically some functions cannot be integrated to AA
- Audio sources coming from android or from external (android not aware of them)
- Each strategy has limitations and can be criticized
- Idea is to get each model and apply to it questions/cases
- Questions like safety sources, raw streams, etc.
Piotr: what do you mean by vendor partition
- Wassim: I didn't want to specify the actual parition because it can be vendor specific
- Gunnar: android concept "vendor partition" is booked, maybe we can find another name like virtual machines?
Piotr: audio sink with headphones, what did you mean?
- Wassim: a sink, it's meant as an Android sink, a sink that is connected to Android
- Gunnar: But is it that straightforward?
- Piotr: it's not, the BT for example is a special case, we would add it to the open questions
Piotr: this is actually something we can work on (refering to the BT case)
- Wassim: I'll add it to the wiki and make it possible for people to add topics
Wassim: we can also think about it that: what questions should be done where
- The output of this project would be a recommendation: we as GENIVI, recommend to use this feature outside of AA and this feature inside of AA, etc.
- Gunnar: this is a nice idea actually to make a hybrid solution because we cannot recommend one solution as GENIVI
- Gunnar: we learn from both approaches and use it to build the hybrid solution
- Piotr: it's also not sure if we can achieve one of these extreme cases completly
Discussion about the page followed to define the new page in the wiki
- Page will describe each topic and we will add comments if we can do it in Android or outside of Android and what areadvantages/disadvantages
- The page will help us reach our recommendation
Piotr: Major problem for common HAL is how to we get raw streams
- Henrik: how to get raw streams, what do you mean by this?
- Piotr: current solution, audio data -> tiny ALSA -> hardware
- To get more flexibility -> not directly to tiny ALSA, direct it to whatever we want
- If we can manipulate this behavior we can manipulate the audio stream and direct it to output
- Gunnar: raw stream is the stream that the source is creating, if we have this stream without volume change, without mixing, without effects, etc.
- Raw Stream: as little change as possible to the stream
- Piotr: I would start by extracting these stream from Android, see if this is feasible
- Gunnar: before implementing or starting we would just need to analyze the current system
- Wassim: we should know if we can extract raw stream from Android or not. Without this point we cannot start the second extreme
- Wassim: hybrid also needs the raw streams
Nadim: What about the point Audio manager update?
- Gunnar: There are updates going on but we are not yet concerned about them
- Gunnar: If we start with outside of android strategy we will come to this subject and check if we need to add to it or update it etc.
Decisions
To proceed in our project of Android and System Level Audio we need several steps:
- Gather topics or questions or features that we would like to check whether they fit in the two strategies
- @all Gather topics in the wiki page created by Wassim
- Analyze the topics in both strategies to see if they are feasible, if they are easy to implement, etc.
- POC and code for each topic in the different strategies would be needed
- Conclude GENIVI recommendation from the POCs made: form a hybrid solution.
- Which topic do we recommend to be implemented in AA and which outside of AA
Starting point would be to check if we can access the raw streams from AA
- Piotr Krawczyk: Tieto suggested to take responsivbility of this task, expect 2-3 weeks for a POC
Next Agenda (for AUDIO_HAL_CW15)
- Discusss the gatehred topics, who can work on which topics and which strategy
- Status update on the "access raw streams"
Thursday 26 March - 11:30am CET
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- Agenda for AUDIO_HAL_CW14:
- Slides from Wassim about the two models inside and outside of AA
- discussion of the cases/features that we are trying to solve
- checking the Audio Manager to decide whether or not it needs an update
- @all: Think and prepare diagrams of how you see the models of AA in control of the audio management and AA not in control of the audio management
- @all: Check what features and what cases do we have in order to validate both models
- @all: Prepare any questions about the Genivi Audio manager, mainly think if it's worth it to update it. Is AA audio manager missing some features?
- Unknown User (niskandar)focus on taking minutes of meeting
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