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. https://github.com/google/oboe/issues/183. also ag/7116429
• 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. https://github.com/google/oboe/issues/252
• AAudio input streams with LOW_LATENCY will open a FAST path using INT16 and convert the data to FLOAT if needed. See: https://github.com/google/oboe/issues/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. https://github.com/google/oboe/issues/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.