setMMapEnabled(true) doesn't mean "allow it", it sets the process's MMAP
policy to AUTO, overriding a device whose aaudio.mmap_policy disables
MMAP. Since #22766 we did that on every audio start, and a Xiaomi Pad 5
Pro (Android 13) has been stuck on a blank screen at launch since then.
The likely cause, not yet confirmed on the device: opening a stream on a
MMAP path the vendor turned off, from the UI thread.
Now the checkbox can only turn MMAP off, as on the Bluetooth TV.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
An Android 11 TV played nothing over a Bluetooth headset since the switch
to Oboe, while its speakers worked. Testing on it showed AAudio with MMAP
is silent there and AAudio without MMAP works, as does OpenSL ES (also
when the headset is connected mid-game), whatever the stream usage. MMAP
should never be used for a Bluetooth route, so it's a firmware bug.
Audio settings get an Audio API choice and a Low-latency audio (MMAP)
checkbox, with hints, so other devices with the same kind of bug can be
worked around. The API defaults to OpenSL ES on TVs and before Android
8.1, where the choice isn't offered, and AAudio elsewhere. Changing them
reopens the streams right away. System Information shows the output
stream that got opened (API, MMAP or not, rate, buffers, device) and any
audio error.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
The Oboe input callback used to call Microphone::addAudioData directly,
writing PSP memory from the audio thread. Now it only pushes samples
into a SampleRing, and pollRecording drains it on the CPU thread.
Starting and stopping still go through Java, which asks for permission.
Every host with a microphone polls now, so sceUsbMic drops what only the
push path needed: QueueBuf's recursive mutex, restarting the mic on a
device change, and the startMic parameter nobody read. Also removes the
unused System_AudioRecordingState and Microphone::isNeedInput.
The Java microphone_command branch didn't return true, so every command
logged "processCommand failed".
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Oboe uses AAudio on Android 8.1+ and falls back to OpenSL ES on older
devices. Output and microphone input both go through it. The mic now gets
resampled by Oboe from the device's rate to whatever the game asks for.
New: when a stream is disconnected (headphones unplugged, Bluetooth device
going away), it's reopened on the new default device instead of going
silent.
Oboe 1.11.0 is added as a submodule, built through ext/oboe-build for CMake
and as a module in Android.mk.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
