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