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 "AAudioServiceEndpointCapture"
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
29#include "core/AudioStreamBuilder.h"
30#include "AAudioServiceEndpoint.h"
31#include "AAudioServiceStreamShared.h"
32#include "AAudioServiceEndpointCapture.h"
33#include "AAudioServiceEndpointShared.h"
34
35using namespace android;  // TODO just import names needed
36using namespace aaudio;   // TODO just import names needed
37
38AAudioServiceEndpointCapture::AAudioServiceEndpointCapture(AAudioService &audioService)
39        : mStreamInternalCapture(audioService, true) {
40    mStreamInternal = &mStreamInternalCapture;
41}
42
43AAudioServiceEndpointCapture::~AAudioServiceEndpointCapture() {
44    delete mDistributionBuffer;
45}
46
47aaudio_result_t AAudioServiceEndpointCapture::open(const aaudio::AAudioStreamRequest &request) {
48    aaudio_result_t result = AAudioServiceEndpointShared::open(request);
49    if (result == AAUDIO_OK) {
50        delete mDistributionBuffer;
51        int distributionBufferSizeBytes = getStreamInternal()->getFramesPerBurst()
52                                          * getStreamInternal()->getBytesPerFrame();
53        mDistributionBuffer = new uint8_t[distributionBufferSizeBytes];
54    }
55    return result;
56}
57
58// Read data from the shared MMAP stream and then distribute it to the client streams.
59void *AAudioServiceEndpointCapture::callbackLoop() {
60    ALOGD("callbackLoop() entering");
61    aaudio_result_t result = AAUDIO_OK;
62    int64_t timeoutNanos = getStreamInternal()->calculateReasonableTimeout();
63
64    // result might be a frame count
65    while (mCallbackEnabled.load() && getStreamInternal()->isActive() && (result >= 0)) {
66
67        int64_t mmapFramesRead = getStreamInternal()->getFramesRead();
68
69        // Read audio data from stream using a blocking read.
70        result = getStreamInternal()->read(mDistributionBuffer, getFramesPerBurst(), timeoutNanos);
71        if (result == AAUDIO_ERROR_DISCONNECTED) {
72            disconnectRegisteredStreams();
73            break;
74        } else if (result != getFramesPerBurst()) {
75            ALOGW("callbackLoop() read %d / %d",
76                  result, getFramesPerBurst());
77            break;
78        }
79
80        // Distribute data to each active stream.
81        { // brackets are for lock_guard
82
83            std::lock_guard <std::mutex> lock(mLockStreams);
84            for (const auto clientStream : mRegisteredStreams) {
85                if (clientStream->isRunning()) {
86                    int64_t clientFramesWritten = 0;
87                    sp<AAudioServiceStreamShared> streamShared =
88                            static_cast<AAudioServiceStreamShared *>(clientStream.get());
89
90                    {
91                        // Lock the AudioFifo to protect against close.
92                        std::lock_guard <std::mutex> lock(streamShared->getAudioDataQueueLock());
93
94                        FifoBuffer *fifo = streamShared->getAudioDataFifoBuffer_l();
95                        if (fifo != nullptr) {
96
97                            // Determine offset between framePosition in client's stream
98                            // vs the underlying MMAP stream.
99                            clientFramesWritten = fifo->getWriteCounter();
100                            // There are two indices that refer to the same frame.
101                            int64_t positionOffset = mmapFramesRead - clientFramesWritten;
102                            streamShared->setTimestampPositionOffset(positionOffset);
103
104                            // Is the buffer too full to write a burst?
105                            if (fifo->getFifoControllerBase()->getEmptyFramesAvailable() <
106                                    getFramesPerBurst()) {
107                                streamShared->incrementXRunCount();
108                            } else {
109                                fifo->write(mDistributionBuffer, getFramesPerBurst());
110                            }
111                            clientFramesWritten = fifo->getWriteCounter();
112                        }
113                    }
114
115                    if (clientFramesWritten > 0) {
116                        // This timestamp represents the completion of data being written into the
117                        // client buffer. It is sent to the client and used in the timing model
118                        // to decide when data will be available to read.
119                        Timestamp timestamp(clientFramesWritten, AudioClock::getNanoseconds());
120                        streamShared->markTransferTime(timestamp);
121                    }
122
123                }
124            }
125        }
126    }
127
128    ALOGD("callbackLoop() exiting");
129    return NULL; // TODO review
130}
131