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fix(bluetooth): BT SCO mode skips 48kHz + VoiceCommunication on capture

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Root cause: Oboe capture at 48kHz with InputPreset::VoiceCommunication
cannot open against a BT SCO device (only supports 8/16kHz). The stream
silently falls back to builtin mic, delivering zeros.

Fix: add bt_active flag to WzpOboeConfig. When set, capture skips
setSampleRate and setInputPreset, letting the system route to BT SCO
at its native rate. Oboe's SampleRateConversionQuality::Best resamples
to 48kHz for our ring buffers. Playout uses Usage::Media in BT mode.

New API: wzp_native_audio_start_bt() for BT mode, called from
set_bluetooth_sco(on=true). Normal audio_start() restores the
standard config when switching back to earpiece/speaker.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Siavash Sameni
2026-04-12 17:23:19 +04:00
parent 5dfb5b3581
commit 137fe5f084
5 changed files with 65 additions and 12 deletions
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36
crates/wzp-native/cpp/oboe_bridge.cpp
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@@ -254,18 +254,28 @@ int wzp_oboe_start(const WzpOboeConfig* config, const WzpOboeRings* rings) {
oboe::AudioStreamBuilder captureBuilder;
captureBuilder.setDirection(oboe::Direction::Input)
->setPerformanceMode(oboe::PerformanceMode::LowLatency)
// Shared mode allows Oboe's internal resampler to bridge 48kHz to
// the hardware rate (8/16kHz for BT SCO). Exclusive mode bypasses
// the resampler and fails with "getInputProfile could not find profile".
->setSharingMode(oboe::SharingMode::Shared)
->setFormat(oboe::AudioFormat::I16)
->setChannelCount(config->channel_count)
->setSampleRate(config->sample_rate)
->setFramesPerDataCallback(config->frames_per_burst)
->setInputPreset(oboe::InputPreset::VoiceCommunication)
->setSampleRateConversionQuality(oboe::SampleRateConversionQuality::Best)
->setDataCallback(&g_capture_cb);
if (config->bt_active) {
// BT SCO mode: do NOT set sample rate or input preset.
// Requesting 48kHz against a BT SCO device fails with
// "getInputProfile could not find profile". Letting the system
// choose the native rate (8/16kHz) and relying on Oboe's
// resampler (SampleRateConversionQuality::Best) to bridge
// to our 48kHz ring buffer is the only path that works.
// InputPreset::VoiceCommunication can also prevent BT SCO
// routing on some devices — skip it for BT.
LOGI("capture: BT mode — no sample rate or input preset set");
} else {
captureBuilder.setSampleRate(config->sample_rate)
->setFramesPerDataCallback(config->frames_per_burst)
->setInputPreset(oboe::InputPreset::VoiceCommunication);
}
oboe::Result result = captureBuilder.openStream(g_capture_stream);
if (result != oboe::Result::OK) {
LOGE("Failed to open capture stream: %s", oboe::convertToText(result));
@@ -321,12 +331,20 @@ int wzp_oboe_start(const WzpOboeConfig* config, const WzpOboeRings* rings) {
->setSharingMode(oboe::SharingMode::Shared)
->setFormat(oboe::AudioFormat::I16)
->setChannelCount(config->channel_count)
->setSampleRate(config->sample_rate)
->setFramesPerDataCallback(config->frames_per_burst)
->setUsage(oboe::Usage::VoiceCommunication)
->setSampleRateConversionQuality(oboe::SampleRateConversionQuality::Best)
->setDataCallback(&g_playout_cb);
if (config->bt_active) {
LOGI("playout: BT mode — no sample rate set, using Usage::Media");
// Usage::Media instead of VoiceCommunication for BT output
// to avoid conflicts with the communication device routing.
playoutBuilder.setUsage(oboe::Usage::Media);
} else {
playoutBuilder.setSampleRate(config->sample_rate)
->setFramesPerDataCallback(config->frames_per_burst)
->setUsage(oboe::Usage::VoiceCommunication);
}
result = playoutBuilder.openStream(g_playout_stream);
if (result != oboe::Result::OK) {
LOGE("Failed to open playout stream: %s", oboe::convertToText(result));