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audio: Clarify that MMap h/w position must be continuous

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The VTS test already verifies that the MMap hardware position
never resets or goes back, but the official wording in the AIDL
interface was lacking.

Bug: 350998390
Bug: 363139283
Test: none, doc change
Change-Id: I07b9842f53c89549fe648ee839d875d31a7a849d
This commit is contained in:
Mikhail Naganov
2024-09-04 10:11:59 -07:00
parent bee59e3b47
commit 189cd6a599
1 changed files with 12 additions and 3 deletions
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15
audio/aidl/android/hardware/audio/core/StreamDescriptor.aidl
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@@ -386,14 +386,23 @@ parcelable StreamDescriptor {
* For input streams: the moment when data at the specified stream position
* was acquired (i.e. capture position).
*
* The observable position must never be reset by the HAL module.
* The data type of the frame counter is large enough to support
* continuous counting for years of operation.
* The observable position must never be reset by the HAL module,
* providing an abstraction of continuous audio data flow. The data
* type of the frame counter is large enough to support continuous
* counting for years of operation.
*/
Position observable;
/**
* Used only for MMap streams to provide the hardware read / write
* position for audio data in the shared memory buffer 'audio.mmap'.
* Similar to the observable position, the 'Position::UNKNOWN' value
* can be returned when the HAL module is unable to retrieve the current
* position.
*
* The hardware position must never be reset by the HAL module,
* providing an abstraction of continuous audio data flow. The data
* type of the frame counter is large enough to support continuous
* counting for years of operation.
*/
Position hardware;
/**