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 "AAudioServiceEndpointShared"
19 //#define LOG_NDEBUG 0
20 #include <utils/Log.h>
21
22 #include <iomanip>
23 #include <iostream>
24 #include <sstream>
25
26 #include "binding/AAudioServiceMessage.h"
27 #include "client/AudioStreamInternal.h"
28 #include "client/AudioStreamInternalPlay.h"
29 #include "core/AudioStreamBuilder.h"
30
31 #include "AAudioServiceEndpointShared.h"
32 #include "AAudioServiceStreamShared.h"
33 #include "AAudioServiceStreamMMAP.h"
34 #include "AAudioMixer.h"
35 #include "AAudioService.h"
36
37 using namespace android;
38 using namespace aaudio;
39
40 // This is the maximum size in frames. The effective size can be tuned smaller at runtime.
41 #define DEFAULT_BUFFER_CAPACITY (48 * 8)
42
dump() const43 std::string AAudioServiceEndpointShared::dump() const {
44 std::stringstream result;
45
46 result << " SHARED: sharing exclusive stream with handle = 0x"
47 << std::setfill('0') << std::setw(8)
48 << std::hex << mStreamInternal->getServiceHandle()
49 << std::dec << std::setfill(' ');
50 result << ", XRuns = " << mStreamInternal->getXRunCount();
51 result << "\n";
52 result << " Running Stream Count: " << mRunningStreamCount << "\n";
53
54 result << AAudioServiceEndpoint::dump();
55 return result.str();
56 }
57
58 // Share an AudioStreamInternal.
open(const aaudio::AAudioStreamRequest & request)59 aaudio_result_t AAudioServiceEndpointShared::open(const aaudio::AAudioStreamRequest &request) {
60 aaudio_result_t result = AAUDIO_OK;
61 const AAudioStreamConfiguration &configuration = request.getConstantConfiguration();
62
63 copyFrom(configuration);
64 mRequestedDeviceId = configuration.getDeviceId();
65
66 AudioStreamBuilder builder;
67 builder.copyFrom(configuration);
68
69 builder.setSharingMode(AAUDIO_SHARING_MODE_EXCLUSIVE);
70 // Don't fall back to SHARED because that would cause recursion.
71 builder.setSharingModeMatchRequired(true);
72
73 builder.setBufferCapacity(DEFAULT_BUFFER_CAPACITY);
74
75 result = mStreamInternal->open(builder);
76
77 setSampleRate(mStreamInternal->getSampleRate());
78 setSamplesPerFrame(mStreamInternal->getSamplesPerFrame());
79 setDeviceId(mStreamInternal->getDeviceId());
80 setSessionId(mStreamInternal->getSessionId());
81 mFramesPerBurst = mStreamInternal->getFramesPerBurst();
82
83 return result;
84 }
85
close()86 aaudio_result_t AAudioServiceEndpointShared::close() {
87 return getStreamInternal()->close();
88 }
89
90 // Glue between C and C++ callbacks.
aaudio_endpoint_thread_proc(void * arg)91 static void *aaudio_endpoint_thread_proc(void *arg) {
92 assert(arg != nullptr);
93
94 // The caller passed in a smart pointer to prevent the endpoint from getting deleted
95 // while the thread was launching.
96 sp<AAudioServiceEndpointShared> *endpointForThread =
97 static_cast<sp<AAudioServiceEndpointShared> *>(arg);
98 sp<AAudioServiceEndpointShared> endpoint = *endpointForThread;
99 delete endpointForThread; // Just use scoped smart pointer. Don't need this anymore.
100 void *result = endpoint->callbackLoop();
101 // Close now so that the HW resource is freed and we can open a new device.
102 if (!endpoint->isConnected()) {
103 endpoint->close();
104 }
105
106 return result;
107 }
108
startSharingThread_l()109 aaudio_result_t aaudio::AAudioServiceEndpointShared::startSharingThread_l() {
110 // Launch the callback loop thread.
111 int64_t periodNanos = getStreamInternal()->getFramesPerBurst()
112 * AAUDIO_NANOS_PER_SECOND
113 / getSampleRate();
114 mCallbackEnabled.store(true);
115 // Pass a smart pointer so the thread can hold a reference.
116 sp<AAudioServiceEndpointShared> *endpointForThread = new sp<AAudioServiceEndpointShared>(this);
117 aaudio_result_t result = getStreamInternal()->createThread(periodNanos,
118 aaudio_endpoint_thread_proc,
119 endpointForThread);
120 if (result != AAUDIO_OK) {
121 // The thread can't delete it so we have to do it here.
122 delete endpointForThread;
123 }
124 return result;
125 }
126
stopSharingThread()127 aaudio_result_t aaudio::AAudioServiceEndpointShared::stopSharingThread() {
128 mCallbackEnabled.store(false);
129 aaudio_result_t result = getStreamInternal()->joinThread(NULL);
130 return result;
131 }
132
startStream(sp<AAudioServiceStreamBase> sharedStream,audio_port_handle_t * clientHandle)133 aaudio_result_t AAudioServiceEndpointShared::startStream(sp<AAudioServiceStreamBase> sharedStream,
134 audio_port_handle_t *clientHandle) {
135 aaudio_result_t result = AAUDIO_OK;
136
137 {
138 std::lock_guard<std::mutex> lock(mLockStreams);
139 if (++mRunningStreamCount == 1) { // atomic
140 result = getStreamInternal()->requestStart();
141 if (result != AAUDIO_OK) {
142 --mRunningStreamCount;
143 } else {
144 result = startSharingThread_l();
145 if (result != AAUDIO_OK) {
146 getStreamInternal()->requestStop();
147 --mRunningStreamCount;
148 }
149 }
150 }
151 }
152
153 if (result == AAUDIO_OK) {
154 result = getStreamInternal()->startClient(sharedStream->getAudioClient(), clientHandle);
155 if (result != AAUDIO_OK) {
156 if (--mRunningStreamCount == 0) { // atomic
157 stopSharingThread();
158 getStreamInternal()->requestStop();
159 }
160 }
161 }
162
163 return result;
164 }
165
stopStream(sp<AAudioServiceStreamBase> sharedStream,audio_port_handle_t clientHandle)166 aaudio_result_t AAudioServiceEndpointShared::stopStream(sp<AAudioServiceStreamBase> sharedStream,
167 audio_port_handle_t clientHandle) {
168 // Don't lock here because the disconnectRegisteredStreams also uses the lock.
169
170 // Ignore result.
171 (void) getStreamInternal()->stopClient(clientHandle);
172
173 if (--mRunningStreamCount == 0) { // atomic
174 stopSharingThread();
175 getStreamInternal()->requestStop();
176 }
177 return AAUDIO_OK;
178 }
179
180 // Get timestamp that was written by the real-time service thread, eg. mixer.
getFreeRunningPosition(int64_t * positionFrames,int64_t * timeNanos)181 aaudio_result_t AAudioServiceEndpointShared::getFreeRunningPosition(int64_t *positionFrames,
182 int64_t *timeNanos) {
183 if (mAtomicTimestamp.isValid()) {
184 Timestamp timestamp = mAtomicTimestamp.read();
185 *positionFrames = timestamp.getPosition();
186 *timeNanos = timestamp.getNanoseconds();
187 return AAUDIO_OK;
188 } else {
189 return AAUDIO_ERROR_UNAVAILABLE;
190 }
191 }
192
getTimestamp(int64_t * positionFrames,int64_t * timeNanos)193 aaudio_result_t AAudioServiceEndpointShared::getTimestamp(int64_t *positionFrames,
194 int64_t *timeNanos) {
195 return mStreamInternal->getTimestamp(CLOCK_MONOTONIC, positionFrames, timeNanos);
196 }
197