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362 lines
16 KiB
362 lines
16 KiB
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "AAudioService"
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//#define LOG_NDEBUG 0
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#include <utils/Log.h>
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#include <iomanip>
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#include <iostream>
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#include <sstream>
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#include <android/content/AttributionSourceState.h>
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#include <aaudio/AAudio.h>
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#include <media/AidlConversion.h>
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#include <mediautils/ServiceUtilities.h>
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#include <utils/String16.h>
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#include "binding/AAudioServiceMessage.h"
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#include "AAudioClientTracker.h"
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#include "AAudioEndpointManager.h"
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#include "AAudioService.h"
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#include "AAudioServiceStreamMMAP.h"
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#include "AAudioServiceStreamShared.h"
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using namespace android;
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using namespace aaudio;
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#define MAX_STREAMS_PER_PROCESS 8
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#define AIDL_RETURN(x) { *_aidl_return = (x); return Status::ok(); }
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#define VALUE_OR_RETURN_ILLEGAL_ARG_STATUS(x) \
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({ auto _tmp = (x); \
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if (!_tmp.ok()) AIDL_RETURN(AAUDIO_ERROR_ILLEGAL_ARGUMENT); \
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std::move(_tmp.value()); })
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using android::AAudioService;
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using android::content::AttributionSourceState;
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using binder::Status;
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android::AAudioService::AAudioService()
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: BnAAudioService(),
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mAdapter(this) {
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// TODO consider using geteuid()
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// TODO b/182392769: use attribution source util
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mAudioClient.attributionSource.uid = VALUE_OR_FATAL(legacy2aidl_uid_t_int32_t(getuid()));
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mAudioClient.attributionSource.pid = VALUE_OR_FATAL(legacy2aidl_pid_t_int32_t(getpid()));
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mAudioClient.attributionSource.packageName = std::nullopt;
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mAudioClient.attributionSource.attributionTag = std::nullopt;
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AAudioClientTracker::getInstance().setAAudioService(this);
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}
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status_t AAudioService::dump(int fd, const Vector<String16>& args) {
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std::string result;
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if (!dumpAllowed()) {
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std::stringstream ss;
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ss << "Permission Denial: can't dump AAudioService from pid="
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<< IPCThreadState::self()->getCallingPid() << ", uid="
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<< IPCThreadState::self()->getCallingUid() << "\n";
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result = ss.str();
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ALOGW("%s", result.c_str());
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} else {
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result = "------------ AAudio Service ------------\n"
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+ mStreamTracker.dump()
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+ AAudioClientTracker::getInstance().dump()
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+ AAudioEndpointManager::getInstance().dump();
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}
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(void)write(fd, result.c_str(), result.size());
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return NO_ERROR;
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}
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Status AAudioService::registerClient(const sp<IAAudioClient> &client) {
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pid_t pid = IPCThreadState::self()->getCallingPid();
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AAudioClientTracker::getInstance().registerClient(pid, client);
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return Status::ok();
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}
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Status
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AAudioService::openStream(const StreamRequest &_request, StreamParameters* _paramsOut,
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int32_t *_aidl_return) {
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static_assert(std::is_same_v<aaudio_result_t, std::decay_t<typeof(*_aidl_return)>>);
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// Create wrapper objects for simple usage of the parcelables.
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const AAudioStreamRequest request(_request);
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AAudioStreamConfiguration paramsOut;
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// A lock in is used to order the opening of endpoints when an
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// EXCLUSIVE endpoint is stolen. We want the order to be:
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// 1) Thread A opens exclusive MMAP endpoint
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// 2) Thread B wants to open an exclusive MMAP endpoint so it steals the one from A
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// under this lock.
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// 3) Thread B opens a shared MMAP endpoint.
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// 4) Thread A can then get the lock and also open a shared stream.
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// Without the lock. Thread A might sneak in and reallocate an exclusive stream
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// before B can open the shared stream.
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std::unique_lock<std::recursive_mutex> lock(mOpenLock);
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aaudio_result_t result = AAUDIO_OK;
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sp<AAudioServiceStreamBase> serviceStream;
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const AAudioStreamConfiguration &configurationInput = request.getConstantConfiguration();
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bool sharingModeMatchRequired = request.isSharingModeMatchRequired();
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aaudio_sharing_mode_t sharingMode = configurationInput.getSharingMode();
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// Enforce limit on client processes.
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AttributionSourceState attributionSource = request.getAttributionSource();
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pid_t pid = IPCThreadState::self()->getCallingPid();
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attributionSource.pid = VALUE_OR_RETURN_ILLEGAL_ARG_STATUS(
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legacy2aidl_pid_t_int32_t(pid));
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attributionSource.uid = VALUE_OR_RETURN_ILLEGAL_ARG_STATUS(
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legacy2aidl_uid_t_int32_t(IPCThreadState::self()->getCallingUid()));
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attributionSource.token = sp<BBinder>::make();
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if (attributionSource.pid != mAudioClient.attributionSource.pid) {
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int32_t count = AAudioClientTracker::getInstance().getStreamCount(pid);
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if (count >= MAX_STREAMS_PER_PROCESS) {
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ALOGE("openStream(): exceeded max streams per process %d >= %d",
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count, MAX_STREAMS_PER_PROCESS);
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AIDL_RETURN(AAUDIO_ERROR_UNAVAILABLE);
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}
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}
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if (sharingMode != AAUDIO_SHARING_MODE_EXCLUSIVE && sharingMode != AAUDIO_SHARING_MODE_SHARED) {
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ALOGE("openStream(): unrecognized sharing mode = %d", sharingMode);
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AIDL_RETURN(AAUDIO_ERROR_ILLEGAL_ARGUMENT);
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}
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if (sharingMode == AAUDIO_SHARING_MODE_EXCLUSIVE
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&& AAudioClientTracker::getInstance().isExclusiveEnabled(pid)) {
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// only trust audioserver for in service indication
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bool inService = false;
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if (isCallerInService()) {
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inService = request.isInService();
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}
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serviceStream = new AAudioServiceStreamMMAP(*this, inService);
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result = serviceStream->open(request);
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if (result != AAUDIO_OK) {
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// Clear it so we can possibly fall back to using a shared stream.
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ALOGW("openStream(), could not open in EXCLUSIVE mode");
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serviceStream.clear();
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}
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}
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// Try SHARED if SHARED requested or if EXCLUSIVE failed.
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if (sharingMode == AAUDIO_SHARING_MODE_SHARED) {
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serviceStream = new AAudioServiceStreamShared(*this);
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result = serviceStream->open(request);
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} else if (serviceStream.get() == nullptr && !sharingModeMatchRequired) {
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aaudio::AAudioStreamRequest modifiedRequest = request;
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// Overwrite the original EXCLUSIVE mode with SHARED.
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modifiedRequest.getConfiguration().setSharingMode(AAUDIO_SHARING_MODE_SHARED);
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serviceStream = new AAudioServiceStreamShared(*this);
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result = serviceStream->open(modifiedRequest);
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}
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if (result != AAUDIO_OK) {
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serviceStream.clear();
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AIDL_RETURN(result);
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} else {
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aaudio_handle_t handle = mStreamTracker.addStreamForHandle(serviceStream.get());
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serviceStream->setHandle(handle);
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AAudioClientTracker::getInstance().registerClientStream(pid, serviceStream);
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paramsOut.copyFrom(*serviceStream);
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*_paramsOut = std::move(paramsOut).parcelable();
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// Log open in MediaMetrics after we have the handle because we need the handle to
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// create the metrics ID.
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serviceStream->logOpen(handle);
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ALOGV("%s(): return handle = 0x%08X", __func__, handle);
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AIDL_RETURN(handle);
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}
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}
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Status AAudioService::closeStream(int32_t streamHandle, int32_t *_aidl_return) {
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static_assert(std::is_same_v<aaudio_result_t, std::decay_t<typeof(*_aidl_return)>>);
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// Check permission and ownership first.
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sp<AAudioServiceStreamBase> serviceStream = convertHandleToServiceStream(streamHandle);
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if (serviceStream.get() == nullptr) {
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ALOGE("closeStream(0x%0x), illegal stream handle", streamHandle);
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AIDL_RETURN(AAUDIO_ERROR_INVALID_HANDLE);
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}
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AIDL_RETURN(closeStream(serviceStream));
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}
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Status AAudioService::getStreamDescription(int32_t streamHandle, Endpoint* endpoint,
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int32_t *_aidl_return) {
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static_assert(std::is_same_v<aaudio_result_t, std::decay_t<typeof(*_aidl_return)>>);
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sp<AAudioServiceStreamBase> serviceStream = convertHandleToServiceStream(streamHandle);
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if (serviceStream.get() == nullptr) {
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ALOGE("getStreamDescription(), illegal stream handle = 0x%0x", streamHandle);
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AIDL_RETURN(AAUDIO_ERROR_INVALID_HANDLE);
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}
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AudioEndpointParcelable endpointParcelable;
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aaudio_result_t result = serviceStream->getDescription(endpointParcelable);
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if (result == AAUDIO_OK) {
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*endpoint = std::move(endpointParcelable).parcelable();
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}
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AIDL_RETURN(result);
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}
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Status AAudioService::startStream(int32_t streamHandle, int32_t *_aidl_return) {
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static_assert(std::is_same_v<aaudio_result_t, std::decay_t<typeof(*_aidl_return)>>);
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sp<AAudioServiceStreamBase> serviceStream = convertHandleToServiceStream(streamHandle);
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if (serviceStream.get() == nullptr) {
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ALOGW("%s(), invalid streamHandle = 0x%0x", __func__, streamHandle);
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AIDL_RETURN(AAUDIO_ERROR_INVALID_HANDLE);
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}
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AIDL_RETURN(serviceStream->start());
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}
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Status AAudioService::pauseStream(int32_t streamHandle, int32_t *_aidl_return) {
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static_assert(std::is_same_v<aaudio_result_t, std::decay_t<typeof(*_aidl_return)>>);
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sp<AAudioServiceStreamBase> serviceStream = convertHandleToServiceStream(streamHandle);
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if (serviceStream.get() == nullptr) {
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ALOGW("%s(), invalid streamHandle = 0x%0x", __func__, streamHandle);
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AIDL_RETURN(AAUDIO_ERROR_INVALID_HANDLE);
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}
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AIDL_RETURN(serviceStream->pause());
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}
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Status AAudioService::stopStream(int32_t streamHandle, int32_t *_aidl_return) {
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static_assert(std::is_same_v<aaudio_result_t, std::decay_t<typeof(*_aidl_return)>>);
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sp<AAudioServiceStreamBase> serviceStream = convertHandleToServiceStream(streamHandle);
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if (serviceStream.get() == nullptr) {
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ALOGW("%s(), invalid streamHandle = 0x%0x", __func__, streamHandle);
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AIDL_RETURN(AAUDIO_ERROR_INVALID_HANDLE);
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}
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AIDL_RETURN(serviceStream->stop());
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}
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Status AAudioService::flushStream(int32_t streamHandle, int32_t *_aidl_return) {
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static_assert(std::is_same_v<aaudio_result_t, std::decay_t<typeof(*_aidl_return)>>);
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sp<AAudioServiceStreamBase> serviceStream = convertHandleToServiceStream(streamHandle);
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if (serviceStream.get() == nullptr) {
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ALOGW("%s(), invalid streamHandle = 0x%0x", __func__, streamHandle);
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AIDL_RETURN(AAUDIO_ERROR_INVALID_HANDLE);
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}
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AIDL_RETURN(serviceStream->flush());
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}
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Status AAudioService::registerAudioThread(int32_t streamHandle, int32_t clientThreadId, int64_t periodNanoseconds,
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int32_t *_aidl_return) {
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static_assert(std::is_same_v<aaudio_result_t, std::decay_t<typeof(*_aidl_return)>>);
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sp<AAudioServiceStreamBase> serviceStream = convertHandleToServiceStream(streamHandle);
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if (serviceStream.get() == nullptr) {
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ALOGW("%s(), invalid streamHandle = 0x%0x", __func__, streamHandle);
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AIDL_RETURN(AAUDIO_ERROR_INVALID_HANDLE);
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}
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int32_t priority = isCallerInService()
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? kRealTimeAudioPriorityService : kRealTimeAudioPriorityClient;
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AIDL_RETURN(serviceStream->registerAudioThread(clientThreadId, priority));
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}
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Status AAudioService::unregisterAudioThread(int32_t streamHandle, int32_t clientThreadId,
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int32_t *_aidl_return) {
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static_assert(std::is_same_v<aaudio_result_t, std::decay_t<typeof(*_aidl_return)>>);
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sp<AAudioServiceStreamBase> serviceStream = convertHandleToServiceStream(streamHandle);
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if (serviceStream.get() == nullptr) {
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ALOGW("%s(), invalid streamHandle = 0x%0x", __func__, streamHandle);
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AIDL_RETURN(AAUDIO_ERROR_INVALID_HANDLE);
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}
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AIDL_RETURN(serviceStream->unregisterAudioThread(clientThreadId));
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}
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bool AAudioService::isCallerInService() {
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pid_t clientPid = VALUE_OR_FATAL(aidl2legacy_int32_t_pid_t(mAudioClient.attributionSource.pid));
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uid_t clientUid = VALUE_OR_FATAL(aidl2legacy_int32_t_uid_t(mAudioClient.attributionSource.uid));
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return clientPid == IPCThreadState::self()->getCallingPid() &&
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clientUid == IPCThreadState::self()->getCallingUid();
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}
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aaudio_result_t AAudioService::closeStream(sp<AAudioServiceStreamBase> serviceStream) {
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// This is protected by a lock in AAudioClientTracker.
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// It is safe to unregister the same stream twice.
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pid_t pid = serviceStream->getOwnerProcessId();
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AAudioClientTracker::getInstance().unregisterClientStream(pid, serviceStream);
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// This is protected by a lock in mStreamTracker.
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// It is safe to remove the same stream twice.
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mStreamTracker.removeStreamByHandle(serviceStream->getHandle());
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return serviceStream->close();
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}
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sp<AAudioServiceStreamBase> AAudioService::convertHandleToServiceStream(
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aaudio_handle_t streamHandle) {
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sp<AAudioServiceStreamBase> serviceStream = mStreamTracker.getStreamByHandle(
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streamHandle);
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if (serviceStream.get() != nullptr) {
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// Only allow owner or the aaudio service to access the stream.
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const uid_t callingUserId = IPCThreadState::self()->getCallingUid();
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const uid_t ownerUserId = serviceStream->getOwnerUserId();
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const uid_t clientUid = VALUE_OR_FATAL(
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aidl2legacy_int32_t_uid_t(mAudioClient.attributionSource.uid));
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bool callerOwnsIt = callingUserId == ownerUserId;
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bool serverCalling = callingUserId == clientUid;
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bool serverOwnsIt = ownerUserId == clientUid;
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bool allowed = callerOwnsIt || serverCalling || serverOwnsIt;
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if (!allowed) {
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ALOGE("AAudioService: calling uid %d cannot access stream 0x%08X owned by %d",
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callingUserId, streamHandle, ownerUserId);
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serviceStream.clear();
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}
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}
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return serviceStream;
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}
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aaudio_result_t AAudioService::startClient(aaudio_handle_t streamHandle,
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const android::AudioClient& client,
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const audio_attributes_t *attr,
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audio_port_handle_t *clientHandle) {
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sp<AAudioServiceStreamBase> serviceStream = convertHandleToServiceStream(streamHandle);
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if (serviceStream.get() == nullptr) {
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ALOGW("%s(), invalid streamHandle = 0x%0x", __func__, streamHandle);
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return AAUDIO_ERROR_INVALID_HANDLE;
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}
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return serviceStream->startClient(client, attr, clientHandle);
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}
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aaudio_result_t AAudioService::stopClient(aaudio_handle_t streamHandle,
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audio_port_handle_t portHandle) {
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sp<AAudioServiceStreamBase> serviceStream = convertHandleToServiceStream(streamHandle);
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if (serviceStream.get() == nullptr) {
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ALOGW("%s(), invalid streamHandle = 0x%0x", __func__, streamHandle);
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return AAUDIO_ERROR_INVALID_HANDLE;
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}
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return serviceStream->stopClient(portHandle);
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}
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// This is only called internally when AudioFlinger wants to tear down a stream.
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// So we do not have to check permissions.
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aaudio_result_t AAudioService::disconnectStreamByPortHandle(audio_port_handle_t portHandle) {
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ALOGD("%s(%d) called", __func__, portHandle);
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sp<AAudioServiceStreamBase> serviceStream =
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mStreamTracker.findStreamByPortHandle(portHandle);
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if (serviceStream.get() == nullptr) {
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ALOGE("%s(), could not find stream with portHandle = %d", __func__, portHandle);
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return AAUDIO_ERROR_INVALID_HANDLE;
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}
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// This is protected by a lock and will just return if already stopped.
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aaudio_result_t result = serviceStream->stop();
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serviceStream->disconnect();
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return result;
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}
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