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curation of topics from : List of prioritized topics for the Audio HAL
PoC github repo : android-external-audio-mixing repository
hint about progress steps
- define the related sw component affected by changes
- define the interfaces (details discussed between those who change the components)
- define which tasks require a real HW and which ones can be deployed on emulator (which part of the code is HW dependent)
# | Component - main topics | JIRA sub-items | Implementation details | Owners | JIRA ticket |
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raw streams | Raw Stream Extraction(multizone audio, etc.) todo: detail it + use case | - Overview picture with SW components
- Audio HAL (open point: keep modified or rewrite it)
- Config for multizone
- Separate contexts for audio input PCM streams (open point: separation concept to be defined)
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| (microphone, or external player) todo: detail it + use case todo: be more explicit and clear about for example what is "external" | - Design Overview (pointing to the actual sw comp)
- getting stream from Microphone (line in)
- external player or other device (BT or other)
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13 | Bluetooth Integration in Android System.As a user I have a BT headset (with speakers, microphone, control buttons, or even the car itself, etc.). I should be able to use it in an Android System. | - Overview design
- Usage of a bluetooth headset with Android BT stack only
- Microhpone from Headset, audio on External Loudspeakers
- No Bluetooth, both Microhpone and Loudspeakers are used for telephony example such as skype or any other
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08 | Ensure measurability of full audio path latencyAs a user I would not want my audio connection to be delayed. Each delay measure will be split in modules, which module brings which delay, eg (Bluetooth delay, mixing delay, routing delay,...) | - Overview design
- components and APIs involved in the Audio path
- anti-jitter buffers configurations
- Total delay for Telephony on external speakers use case
- Total delay for Video streaming where audio plays on an external speaker
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| Offloading to external speakers or loopback to Android.(offloading examples, codecs MPEG,MP3, DSPs, transport e.g. AVB) | - Design Overview (pointing to the actual sw comp)
- Offloading part-1 (overview on concept, which APIs)
- Offloading part-2 (usage)
- Offloading with loopback to Android
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09 | Offloading use case : Forwarding Multi-Channel audioefficiency by keeping
| - PCM 5.1 sample audio
- Guidelines for specific policy config to prevent downmixing
- Example implementation
- playing multichannles 5.1 audio from Netflix (any DRM issues)
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# | Summary | Due Date | Content Work Packages | Details Comments |
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1 | running demo on real HW |
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| - compiling android-external-audio-mixing repository for selected target HW (Renesas-H3)
- optional support for 2nd HW (Low cost HiKey)
- TODO define functions to be included (input streams)
- At this stage, the function selection for Milestone 3 should be agreed upon
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2 | Full Audio Path on real HW |
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| - support of full audio path
- Raw streams extraction
- input external streams
- control of an external stream
- demo should showcase at least one function
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3 | Selected Functions partitioned on HW |
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| - All selected and prioritized functions running on the main target HW
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