1/*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17
18#define LOG_TAG "AAudio"
19//#define LOG_NDEBUG 0
20#include <utils/Log.h>
21
22#include <binder/IServiceManager.h>
23#include <utils/Mutex.h>
24#include <utils/RefBase.h>
25#include <utils/Singleton.h>
26
27#include <aaudio/AAudio.h>
28
29#include "AudioEndpointParcelable.h"
30#include "binding/AAudioStreamRequest.h"
31#include "binding/AAudioStreamConfiguration.h"
32#include "binding/IAAudioService.h"
33#include "binding/AAudioServiceMessage.h"
34
35#include "AAudioBinderClient.h"
36#include "AAudioServiceInterface.h"
37
38using android::String16;
39using android::IServiceManager;
40using android::defaultServiceManager;
41using android::interface_cast;
42using android::IAAudioService;
43using android::Mutex;
44using android::sp;
45
46using namespace aaudio;
47
48static android::Mutex gServiceLock;
49static sp<IAAudioService>  gAAudioService;
50
51ANDROID_SINGLETON_STATIC_INSTANCE(AAudioBinderClient);
52
53// TODO Share code with other service clients.
54// Helper function to get access to the "AAudioService" service.
55// This code was modeled after frameworks/av/media/libaudioclient/AudioSystem.cpp
56static const sp<IAAudioService> getAAudioService() {
57    sp<IBinder> binder;
58    Mutex::Autolock _l(gServiceLock);
59    if (gAAudioService == 0) {
60        sp<IServiceManager> sm = defaultServiceManager();
61        // Try several times to get the service.
62        int retries = 4;
63        do {
64            binder = sm->getService(String16(AAUDIO_SERVICE_NAME)); // This will wait a while.
65            if (binder != 0) {
66                break;
67            }
68        } while (retries-- > 0);
69
70        if (binder != 0) {
71            // TODO Add linkToDeath() like in frameworks/av/media/libaudioclient/AudioSystem.cpp
72            // TODO Create a DeathRecipient that disconnects all active streams.
73            gAAudioService = interface_cast<IAAudioService>(binder);
74        } else {
75            ALOGE("AudioStreamInternal could not get %s", AAUDIO_SERVICE_NAME);
76        }
77    }
78    return gAAudioService;
79}
80
81static void dropAAudioService() {
82    Mutex::Autolock _l(gServiceLock);
83    gAAudioService.clear(); // force a reconnect
84}
85
86AAudioBinderClient::AAudioBinderClient()
87        : AAudioServiceInterface()
88        , Singleton<AAudioBinderClient>() {}
89
90AAudioBinderClient::~AAudioBinderClient() {}
91
92/**
93* @param request info needed to create the stream
94* @param configuration contains information about the created stream
95* @return handle to the stream or a negative error
96*/
97aaudio_handle_t AAudioBinderClient::openStream(const AAudioStreamRequest &request,
98                                               AAudioStreamConfiguration &configurationOutput) {
99    aaudio_handle_t stream;
100    for (int i = 0; i < 2; i++) {
101        const sp<IAAudioService> &service = getAAudioService();
102        if (service == 0) {
103            return AAUDIO_ERROR_NO_SERVICE;
104        }
105
106        stream = service->openStream(request, configurationOutput);
107
108        if (stream == AAUDIO_ERROR_NO_SERVICE) {
109            ALOGE("AAudioBinderClient: lost connection to AAudioService.");
110            dropAAudioService(); // force a reconnect
111        } else {
112            break;
113        }
114    }
115    return stream;
116}
117
118aaudio_result_t AAudioBinderClient::closeStream(aaudio_handle_t streamHandle) {
119    const sp<IAAudioService> &service = getAAudioService();
120    if (service == 0) return AAUDIO_ERROR_NO_SERVICE;
121    return service->closeStream(streamHandle);
122}
123
124/* Get an immutable description of the in-memory queues
125* used to communicate with the underlying HAL or Service.
126*/
127aaudio_result_t AAudioBinderClient::getStreamDescription(aaudio_handle_t streamHandle,
128                                                         AudioEndpointParcelable &parcelable) {
129    const sp<IAAudioService> &service = getAAudioService();
130    if (service == 0) return AAUDIO_ERROR_NO_SERVICE;
131    return service->getStreamDescription(streamHandle, parcelable);
132}
133
134aaudio_result_t AAudioBinderClient::startStream(aaudio_handle_t streamHandle) {
135    const sp<IAAudioService> &service = getAAudioService();
136    if (service == 0) return AAUDIO_ERROR_NO_SERVICE;
137    return service->startStream(streamHandle);
138}
139
140aaudio_result_t AAudioBinderClient::pauseStream(aaudio_handle_t streamHandle) {
141    const sp<IAAudioService> &service = getAAudioService();
142    if (service == 0) return AAUDIO_ERROR_NO_SERVICE;
143    return service->pauseStream(streamHandle);
144}
145
146aaudio_result_t AAudioBinderClient::stopStream(aaudio_handle_t streamHandle) {
147    const sp<IAAudioService> &service = getAAudioService();
148    if (service == 0) return AAUDIO_ERROR_NO_SERVICE;
149    return service->stopStream(streamHandle);
150}
151
152aaudio_result_t AAudioBinderClient::flushStream(aaudio_handle_t streamHandle) {
153    const sp<IAAudioService> &service = getAAudioService();
154    if (service == 0) return AAUDIO_ERROR_NO_SERVICE;
155    return service->flushStream(streamHandle);
156}
157
158/**
159* Manage the specified thread as a low latency audio thread.
160*/
161aaudio_result_t AAudioBinderClient::registerAudioThread(aaudio_handle_t streamHandle,
162                                                        pid_t clientProcessId,
163                                                        pid_t clientThreadId,
164                                                        int64_t periodNanoseconds) {
165    const sp<IAAudioService> &service = getAAudioService();
166    if (service == 0) return AAUDIO_ERROR_NO_SERVICE;
167    return service->registerAudioThread(streamHandle,
168                                        clientProcessId,
169                                        clientThreadId,
170                                        periodNanoseconds);
171}
172
173aaudio_result_t AAudioBinderClient::unregisterAudioThread(aaudio_handle_t streamHandle,
174                                                          pid_t clientProcessId,
175                                                          pid_t clientThreadId) {
176    const sp<IAAudioService> &service = getAAudioService();
177    if (service == 0) return AAUDIO_ERROR_NO_SERVICE;
178    return service->unregisterAudioThread(streamHandle,
179                                          clientProcessId,
180                                          clientThreadId);
181}
182