Android audio history

A list of important audio features, bugs, fixes and workarounds for various Android versions.

10.0 Q - API 29

Fixed: Setting capacity of Legacy input streams < 4096 can prevent use of FAST path. google#183
Add InputPreset:VoicePerformance for low latency recording.

9.0 Pie - API 28 (August 6, 2018)

AAudio adds support for setUsage(), setSessionId(), setContentType(), setInputPreset() for builders.
Regression bug: [AAudio] Headphone disconnect event not fired for MMAP streams. google#252
AAudio input streams with LOW_LATENCY will open a FAST path using INT16 and convert the data to FLOAT if needed. See: google#276

8.1 Oreo MR1 - API 27

Oboe uses AAudio by default.
AAudio MMAP data path enabled on Pixel devices. PerformanceMode::Exclusive supported.
Fixed: [AAudio] RefBase issue
Fixed: Requesting a stereo recording stream can result in sub-optimal latency.

8.0 Oreo - API 26 (August 21, 2017)

AAudio API introduced
Bug: RefBase issue causes crash after stream closed. This why AAudio is not recommended for 8.0. Oboe will use OpenSL ES for 8.0 and earlier. google#40
Bug: Requesting a stereo recording stream can result in sub-optimal latency. Details

7.1 Nougat MR1 - API 25

OpenSL adds supports for setting and querying of PerformanceMode.

7.0 Nougat - API 24 (August 22, 2016)

OpenSL method acquireJavaProxy added, which allows the Java AudioTrack object associated with playback to be obtained (which allows underrun count).

6.0 Marshmallow - API 23 (October 5, 2015)

Floating point recording supported. But it does not allow a FAST "low latency" path.
MIDI API introduced
Sound output is broken on the API 23 emulator

5.0 Lollipop - API 21 (November 12, 2014)

Floating point playback supported.