audio: Adjust default impl for non-RT audio behavior of AVD
The default implementation of the primary HAL is intended to
work with the AVD. Current implementation of virtualized audio
I/O on AVD falls behind actual hardware in terms of I/O timing.
This is not tolerated by CTS tests which are tailored for
real hardware.
Make the primary HAL implementation more resilient to irregular
ALSA read/write behavior on AVD by prolonging I/O time, or
skipping operations when falling behind expected time.
Bug: 302132812
Bug: 302587331
Test: atest CtsMediaAudioTestCases
Change-Id: Ia290d9541a8a0e22d28024f7930ef554396d63c6
diff --git a/audio/aidl/default/include/core-impl/StreamPrimary.h b/audio/aidl/default/include/core-impl/StreamPrimary.h
index abc119c..145c3c4 100644
--- a/audio/aidl/default/include/core-impl/StreamPrimary.h
+++ b/audio/aidl/default/include/core-impl/StreamPrimary.h
@@ -27,13 +27,18 @@
public:
StreamPrimary(StreamContext* context, const Metadata& metadata);
+ ::android::status_t start() override;
::android::status_t transfer(void* buffer, size_t frameCount, size_t* actualFrameCount,
int32_t* latencyMs) override;
+ ::android::status_t refinePosition(StreamDescriptor::Position* position) override;
protected:
std::vector<alsa::DeviceProfile> getDeviceProfiles() override;
const bool mIsAsynchronous;
+ long mStartTimeNs = 0;
+ long mFramesSinceStart = 0;
+ bool mSkipNextTransfer = false;
};
class StreamInPrimary final : public StreamIn, public StreamSwitcher, public StreamInHwGainHelper {
diff --git a/audio/aidl/default/primary/StreamPrimary.cpp b/audio/aidl/default/primary/StreamPrimary.cpp
index 7e3bdd4..457fbb2 100644
--- a/audio/aidl/default/primary/StreamPrimary.cpp
+++ b/audio/aidl/default/primary/StreamPrimary.cpp
@@ -14,12 +14,11 @@
* limitations under the License.
*/
-#include <chrono>
-
#define LOG_TAG "AHAL_StreamPrimary"
#include <android-base/logging.h>
#include <android-base/properties.h>
#include <audio_utils/clock.h>
+#include <error/Result.h>
#include <error/expected_utils.h>
#include "PrimaryMixer.h"
@@ -43,26 +42,52 @@
context->startStreamDataProcessor();
}
+::android::status_t StreamPrimary::start() {
+ RETURN_STATUS_IF_ERROR(StreamAlsa::start());
+ mStartTimeNs = ::android::uptimeNanos();
+ mFramesSinceStart = 0;
+ mSkipNextTransfer = false;
+ return ::android::OK;
+}
+
::android::status_t StreamPrimary::transfer(void* buffer, size_t frameCount,
size_t* actualFrameCount, int32_t* latencyMs) {
- auto start = std::chrono::steady_clock::now();
- if (auto status = StreamAlsa::transfer(buffer, frameCount, actualFrameCount, latencyMs);
- status != ::android::OK) {
- return status;
- }
// This is a workaround for the emulator implementation which has a host-side buffer
- // and this can result in reading faster than real time.
- if (mIsInput && !mIsAsynchronous) {
- auto recordDurationUs = std::chrono::duration_cast<std::chrono::microseconds>(
- std::chrono::steady_clock::now() - start);
- const long projectedVsObservedOffsetUs =
- *actualFrameCount * MICROS_PER_SECOND / mContext.getSampleRate() -
- recordDurationUs.count();
- if (projectedVsObservedOffsetUs > 0) {
- LOG(VERBOSE) << __func__ << ": sleeping for " << projectedVsObservedOffsetUs << " us";
- usleep(projectedVsObservedOffsetUs);
- }
+ // and is not being able to achieve real-time behavior similar to ADSPs (b/302587331).
+ if (!mSkipNextTransfer) {
+ RETURN_STATUS_IF_ERROR(
+ StreamAlsa::transfer(buffer, frameCount, actualFrameCount, latencyMs));
+ } else {
+ LOG(DEBUG) << __func__ << ": skipping transfer (" << frameCount << " frames)";
+ *actualFrameCount = frameCount;
+ if (mIsInput) memset(buffer, 0, frameCount);
+ mSkipNextTransfer = false;
}
+ if (!mIsAsynchronous) {
+ const long bufferDurationUs =
+ (*actualFrameCount) * MICROS_PER_SECOND / mContext.getSampleRate();
+ const auto totalDurationUs =
+ (::android::uptimeNanos() - mStartTimeNs) / NANOS_PER_MICROSECOND;
+ mFramesSinceStart += *actualFrameCount;
+ const long totalOffsetUs =
+ mFramesSinceStart * MICROS_PER_SECOND / mContext.getSampleRate() - totalDurationUs;
+ LOG(VERBOSE) << __func__ << ": totalOffsetUs " << totalOffsetUs;
+ if (totalOffsetUs > 0) {
+ const long sleepTimeUs = std::min(totalOffsetUs, bufferDurationUs);
+ LOG(VERBOSE) << __func__ << ": sleeping for " << sleepTimeUs << " us";
+ usleep(sleepTimeUs);
+ } else {
+ mSkipNextTransfer = true;
+ }
+ } else {
+ LOG(VERBOSE) << __func__ << ": asynchronous transfer";
+ }
+ return ::android::OK;
+}
+
+::android::status_t StreamPrimary::refinePosition(StreamDescriptor::Position*) {
+ // Since not all data is actually sent to the HAL, use the position maintained by Stream class
+ // which accounts for all frames passed from / to the client.
return ::android::OK;
}