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 #define LOG_TAG "AAudioService"
18 //#define LOG_NDEBUG 0
19 #include <utils/Log.h>
20
21 #include <assert.h>
22 #include <map>
23 #include <mutex>
24 #include <utils/Singleton.h>
25
26 #include "AAudioEndpointManager.h"
27 #include "AAudioServiceEndpoint.h"
28 #include <algorithm>
29 #include <mutex>
30 #include <vector>
31
32 #include "core/AudioStreamBuilder.h"
33 #include "AAudioServiceEndpoint.h"
34 #include "AAudioServiceStreamShared.h"
35 #include "AAudioServiceEndpointPlay.h"
36
37 using namespace android; // TODO just import names needed
38 using namespace aaudio; // TODO just import names needed
39
40 #define BURSTS_PER_BUFFER_DEFAULT 2
41
AAudioServiceEndpointPlay(AAudioService & audioService)42 AAudioServiceEndpointPlay::AAudioServiceEndpointPlay(AAudioService &audioService)
43 : mStreamInternalPlay(audioService, true) {
44 }
45
~AAudioServiceEndpointPlay()46 AAudioServiceEndpointPlay::~AAudioServiceEndpointPlay() {
47 }
48
open(int32_t deviceId)49 aaudio_result_t AAudioServiceEndpointPlay::open(int32_t deviceId) {
50 aaudio_result_t result = AAudioServiceEndpoint::open(deviceId);
51 if (result == AAUDIO_OK) {
52 mMixer.allocate(getStreamInternal()->getSamplesPerFrame(),
53 getStreamInternal()->getFramesPerBurst());
54
55 int32_t burstsPerBuffer = AAudioProperty_getMixerBursts();
56 if (burstsPerBuffer == 0) {
57 mLatencyTuningEnabled = true;
58 burstsPerBuffer = BURSTS_PER_BUFFER_DEFAULT;
59 }
60 ALOGD("AAudioServiceEndpoint(): burstsPerBuffer = %d", burstsPerBuffer);
61 int32_t desiredBufferSize = burstsPerBuffer * getStreamInternal()->getFramesPerBurst();
62 getStreamInternal()->setBufferSize(desiredBufferSize);
63 }
64 return result;
65 }
66
67 // Mix data from each application stream and write result to the shared MMAP stream.
callbackLoop()68 void *AAudioServiceEndpointPlay::callbackLoop() {
69 ALOGD("AAudioServiceEndpointPlay(): callbackLoop() entering");
70 int32_t underflowCount = 0;
71
72 aaudio_result_t result = getStreamInternal()->requestStart();
73
74 int64_t timeoutNanos = getStreamInternal()->calculateReasonableTimeout();
75
76 // result might be a frame count
77 while (mCallbackEnabled.load() && getStreamInternal()->isActive() && (result >= 0)) {
78 // Mix data from each active stream.
79 mMixer.clear();
80 { // use lock guard
81 std::lock_guard <std::mutex> lock(mLockStreams);
82 for (AAudioServiceStreamShared *sharedStream : mRunningStreams) {
83 FifoBuffer *fifo = sharedStream->getDataFifoBuffer();
84 float volume = 0.5; // TODO get from system
85 bool underflowed = mMixer.mix(fifo, volume);
86 underflowCount += underflowed ? 1 : 0;
87 // TODO log underflows in each stream
88 sharedStream->markTransferTime(AudioClock::getNanoseconds());
89 }
90 }
91
92 // Write mixer output to stream using a blocking write.
93 result = getStreamInternal()->write(mMixer.getOutputBuffer(),
94 getFramesPerBurst(), timeoutNanos);
95 if (result == AAUDIO_ERROR_DISCONNECTED) {
96 disconnectRegisteredStreams();
97 break;
98 } else if (result != getFramesPerBurst()) {
99 ALOGW("AAudioServiceEndpoint(): callbackLoop() wrote %d / %d",
100 result, getFramesPerBurst());
101 break;
102 }
103 }
104
105 result = getStreamInternal()->requestStop();
106
107 ALOGD("AAudioServiceEndpointPlay(): callbackLoop() exiting, %d underflows", underflowCount);
108 return NULL; // TODO review
109 }
110