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119 lines
3.8 KiB
119 lines
3.8 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 "AAudioStreamTracker"
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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 <aaudio/AAudio.h>
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#include <utils/String16.h>
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#include "AAudioStreamTracker.h"
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using namespace android;
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using namespace aaudio;
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int32_t AAudioStreamTracker::removeStreamByHandle(
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aaudio_handle_t streamHandle) {
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std::lock_guard<std::mutex> lock(mHandleLock);
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auto count = mStreamsByHandle.erase(streamHandle);
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return static_cast<int32_t>(count);
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}
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sp<AAudioServiceStreamBase> AAudioStreamTracker::getStreamByHandle(
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aaudio_handle_t streamHandle) {
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std::lock_guard<std::mutex> lock(mHandleLock);
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sp<AAudioServiceStreamBase> serviceStream;
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auto it = mStreamsByHandle.find(streamHandle);
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if (it != mStreamsByHandle.end()) {
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serviceStream = it->second;
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}
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return serviceStream;
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}
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// The port handle is only available when the stream is started.
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// So we have to iterate over all the streams.
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// Luckily this rarely happens.
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sp<AAudioServiceStreamBase> AAudioStreamTracker::findStreamByPortHandle(
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audio_port_handle_t portHandle) {
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std::lock_guard<std::mutex> lock(mHandleLock);
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sp<AAudioServiceStreamBase> serviceStream;
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auto it = mStreamsByHandle.begin();
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while (it != mStreamsByHandle.end()) {
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auto candidate = it->second;
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if (candidate->getPortHandle() == portHandle) {
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serviceStream = candidate;
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break;
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}
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it++;
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}
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return serviceStream;
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}
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// advance to next legal handle value
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__attribute__((no_sanitize("integer")))
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aaudio_handle_t AAudioStreamTracker::bumpHandle(aaudio_handle_t handle) {
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handle++;
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// Only use positive integers.
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if (handle <= 0) {
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handle = 1;
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}
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return handle;
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}
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aaudio_handle_t AAudioStreamTracker::addStreamForHandle(sp<AAudioServiceStreamBase> serviceStream) {
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std::lock_guard<std::mutex> lock(mHandleLock);
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aaudio_handle_t handle = mPreviousHandle;
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// Assign a unique handle.
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while (true) {
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handle = bumpHandle(handle);
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sp<AAudioServiceStreamBase> oldServiceStream = mStreamsByHandle[handle];
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// Is this an unused handle? It would be extremely unlikely to wrap
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// around and collide with a very old handle. But just in case.
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if (oldServiceStream.get() == nullptr) {
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mStreamsByHandle[handle] = serviceStream;
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break;
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}
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}
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mPreviousHandle = handle;
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return handle;
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}
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std::string AAudioStreamTracker::dump() const NO_THREAD_SAFETY_ANALYSIS {
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std::stringstream result;
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const bool isLocked = AAudio_tryUntilTrue(
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[this]()->bool { return mHandleLock.try_lock(); } /* f */,
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50 /* times */,
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20 /* sleepMs */);
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if (!isLocked) {
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result << "AAudioStreamTracker may be deadlocked\n";
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} else {
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result << "Stream Handles:\n";
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for (const auto& it : mStreamsByHandle) {
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aaudio_handle_t handle = it.second->getHandle();
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result << " 0x" << std::setfill('0') << std::setw(8) << std::hex << handle
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<< std::dec << std::setfill(' ') << "\n";
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}
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mHandleLock.unlock();
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}
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return result.str();
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}
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