audio: Add DriverInterface::start method
This method is used to bring out the hardware from standby.
It replaces the ad hoc 'exitStandby' method in StreamUsb.
Streamlined StreamUsb code to avoid locking during transfers.
Updated StreamRemoteSubmix to use 'start'.
Added extra checks to StreamStub to ensure that 'init/shutdown'
and 'standby/start' methods are called as expected. This allows
removing extra checks from non-stub stream implementations.
Bug: 205884982
Test: atest VtsHalAudioCoreTargetTest
Change-Id: I3615a7ca99cb4f1e149dcbfbc912f2ed58fb033f
diff --git a/audio/aidl/default/usb/StreamUsb.cpp b/audio/aidl/default/usb/StreamUsb.cpp
index 49bc1d6..17e1ab4 100644
--- a/audio/aidl/default/usb/StreamUsb.cpp
+++ b/audio/aidl/default/usb/StreamUsb.cpp
@@ -14,6 +14,8 @@
* limitations under the License.
*/
+#include <limits>
+
#define LOG_TAG "AHAL_StreamUsb"
#include <android-base/logging.h>
@@ -45,25 +47,30 @@
StreamUsb::StreamUsb(const Metadata& metadata, StreamContext&& context)
: StreamCommonImpl(metadata, std::move(context)),
- mFrameSizeBytes(context.getFrameSize()),
- mIsInput(isInput(metadata)) {
+ mFrameSizeBytes(getContext().getFrameSize()),
+ mIsInput(isInput(metadata)),
+ mConfig(maybePopulateConfig(getContext(), mIsInput)) {}
+
+// static
+std::optional<struct pcm_config> StreamUsb::maybePopulateConfig(const StreamContext& context,
+ bool isInput) {
struct pcm_config config;
- config.channels = usb::getChannelCountFromChannelMask(context.getChannelLayout(), mIsInput);
+ config.channels = usb::getChannelCountFromChannelMask(context.getChannelLayout(), isInput);
if (config.channels == 0) {
LOG(ERROR) << __func__ << ": invalid channel=" << context.getChannelLayout().toString();
- return;
+ return std::nullopt;
}
config.format = usb::aidl2legacy_AudioFormatDescription_pcm_format(context.getFormat());
if (config.format == PCM_FORMAT_INVALID) {
LOG(ERROR) << __func__ << ": invalid format=" << context.getFormat().toString();
- return;
+ return std::nullopt;
}
config.rate = context.getSampleRate();
if (config.rate == 0) {
LOG(ERROR) << __func__ << ": invalid sample rate=" << config.rate;
- return;
+ return std::nullopt;
}
- mConfig = config;
+ return config;
}
::android::status_t StreamUsb::init() {
@@ -89,8 +96,8 @@
}
}
std::lock_guard guard(mLock);
- mAlsaDeviceProxies.clear();
RETURN_STATUS_IF_ERROR(StreamCommonImpl::setConnectedDevices(connectedDevices));
+ mConnectedDevicesUpdated.store(true, std::memory_order_release);
return ndk::ScopedAStatus::ok();
}
@@ -111,59 +118,53 @@
::android::status_t StreamUsb::transfer(void* buffer, size_t frameCount, size_t* actualFrameCount,
int32_t* latencyMs) {
- {
- std::lock_guard guard(mLock);
- if (!mConfig.has_value() || mConnectedDevices.empty()) {
- LOG(ERROR) << __func__ << ": failed, has config: " << mConfig.has_value()
- << ", has connected devices: " << mConnectedDevices.empty();
- return ::android::NO_INIT;
- }
- }
- if (mIsStandby) {
- if (::android::status_t status = exitStandby(); status != ::android::OK) {
- LOG(ERROR) << __func__ << ": failed to exit standby, status=" << status;
- return status;
- }
- }
- std::vector<std::shared_ptr<alsa_device_proxy>> alsaDeviceProxies;
- {
- std::lock_guard guard(mLock);
- alsaDeviceProxies = mAlsaDeviceProxies;
+ if (mConnectedDevicesUpdated.load(std::memory_order_acquire)) {
+ // 'setConnectedDevices' has been called. I/O will be restarted.
+ *actualFrameCount = 0;
+ *latencyMs = StreamDescriptor::LATENCY_UNKNOWN;
+ return ::android::OK;
}
const size_t bytesToTransfer = frameCount * mFrameSizeBytes;
+ unsigned maxLatency = 0;
if (mIsInput) {
+ if (mAlsaDeviceProxies.empty()) {
+ LOG(FATAL) << __func__ << ": no input devices";
+ return ::android::NO_INIT;
+ }
// For input case, only support single device.
- proxy_read(alsaDeviceProxies[0].get(), buffer, bytesToTransfer);
+ proxy_read(mAlsaDeviceProxies[0].get(), buffer, bytesToTransfer);
+ maxLatency = proxy_get_latency(mAlsaDeviceProxies[0].get());
} else {
- for (auto& proxy : alsaDeviceProxies) {
+ for (auto& proxy : mAlsaDeviceProxies) {
proxy_write(proxy.get(), buffer, bytesToTransfer);
+ maxLatency = std::max(maxLatency, proxy_get_latency(proxy.get()));
}
}
*actualFrameCount = frameCount;
- *latencyMs = Module::kLatencyMs;
+ maxLatency = std::min(maxLatency, static_cast<unsigned>(std::numeric_limits<int32_t>::max()));
+ *latencyMs = maxLatency;
return ::android::OK;
}
::android::status_t StreamUsb::standby() {
- if (!mIsStandby) {
- std::lock_guard guard(mLock);
- mAlsaDeviceProxies.clear();
- mIsStandby = true;
- }
+ mAlsaDeviceProxies.clear();
return ::android::OK;
}
-void StreamUsb::shutdown() {}
+void StreamUsb::shutdown() {
+ mAlsaDeviceProxies.clear();
+}
-::android::status_t StreamUsb::exitStandby() {
+::android::status_t StreamUsb::start() {
std::vector<AudioDeviceAddress> connectedDevices;
{
std::lock_guard guard(mLock);
std::transform(mConnectedDevices.begin(), mConnectedDevices.end(),
std::back_inserter(connectedDevices),
[](const auto& device) { return device.address; });
+ mConnectedDevicesUpdated.store(false, std::memory_order_release);
}
- std::vector<std::shared_ptr<alsa_device_proxy>> alsaDeviceProxies;
+ decltype(mAlsaDeviceProxies) alsaDeviceProxies;
for (const auto& device : connectedDevices) {
alsa_device_profile profile;
profile_init(&profile, mIsInput ? PCM_IN : PCM_OUT);
@@ -175,16 +176,16 @@
return ::android::UNKNOWN_ERROR;
}
- auto proxy = std::shared_ptr<alsa_device_proxy>(new alsa_device_proxy(),
- [](alsa_device_proxy* proxy) {
- proxy_close(proxy);
- free(proxy);
- });
+ AlsaDeviceProxy proxy(new alsa_device_proxy, [](alsa_device_proxy* proxy) {
+ proxy_close(proxy);
+ free(proxy);
+ });
// Always ask for alsa configure as required since the configuration should be supported
// by the connected device. That is guaranteed by `setAudioPortConfig` and
// `setAudioPatch`.
- if (int err =
- proxy_prepare(proxy.get(), &profile, &mConfig.value(), true /*is_bit_perfect*/);
+ if (int err = proxy_prepare(proxy.get(), &profile,
+ const_cast<struct pcm_config*>(&mConfig.value()),
+ true /*is_bit_perfect*/);
err != 0) {
LOG(ERROR) << __func__ << ": fail to prepare for device address=" << device.toString()
<< " error=" << err;
@@ -197,11 +198,7 @@
}
alsaDeviceProxies.push_back(std::move(proxy));
}
- {
- std::lock_guard guard(mLock);
- mAlsaDeviceProxies = alsaDeviceProxies;
- }
- mIsStandby = false;
+ mAlsaDeviceProxies = std::move(alsaDeviceProxies);
return ::android::OK;
}