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https://github.com/HifiExperiments/overte.git
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150 lines
No EOL
6.1 KiB
C++
150 lines
No EOL
6.1 KiB
C++
//
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// AudioInjector.cpp
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// hifi
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//
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// Created by Stephen Birarda on 1/2/2014.
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// Copyright (c) 2013 HighFidelity, Inc. All rights reserved.
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//
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#include <NodeList.h>
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#include <PacketHeaders.h>
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#include <SharedUtil.h>
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#include <UUID.h>
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#include "AbstractAudioInterface.h"
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#include "AudioRingBuffer.h"
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#include "AudioInjector.h"
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int abstractAudioPointerMeta = qRegisterMetaType<AbstractAudioInterface*>("AbstractAudioInterface*");
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AudioInjector::AudioInjector(Sound* sound, AudioInjectorOptions injectorOptions) :
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_sound(sound),
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_volume(injectorOptions.volume),
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_shouldLoopback(injectorOptions.shouldLoopback),
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_position(injectorOptions.position),
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_orientation(injectorOptions.orientation),
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_loopbackAudioInterface(injectorOptions.loopbackAudioInterface)
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{
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// we want to live on our own thread
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moveToThread(&_thread);
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}
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void AudioInjector::threadSound(Sound* sound, AudioInjectorOptions injectorOptions) {
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AudioInjector injector(sound, injectorOptions);
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// start injecting when the injector thread starts
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connect(&injector._thread, SIGNAL(started()), &injector, SLOT(injectAudio()));
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// connect the right slots and signals so that the AudioInjector is killed once the injection is complete
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connect(&injector, SIGNAL(finished()), &injector._thread, SLOT(quit()));
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connect(&injector, SIGNAL(finished()), &injector, SLOT(deleteLater()));
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injector._thread.start();
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}
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const uchar MAX_INJECTOR_VOLUME = 0xFF;
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void AudioInjector::injectAudio() {
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QByteArray soundByteArray = _sound->getByteArray();
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// make sure we actually have samples downloaded to inject
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if (soundByteArray.size()) {
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// give our sample byte array to the local audio interface, if we have it, so it can be handled locally
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if (_loopbackAudioInterface) {
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// assume that localAudioInterface could be on a separate thread, use Qt::AutoConnection to handle properly
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QMetaObject::invokeMethod(_loopbackAudioInterface, "handleAudioByteArray",
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Qt::AutoConnection,
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Q_ARG(QByteArray, soundByteArray));
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}
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NodeList* nodeList = NodeList::getInstance();
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// setup the packet for injected audio
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unsigned char injectedAudioPacket[MAX_PACKET_SIZE];
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unsigned char* currentPacketPosition = injectedAudioPacket;
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int numBytesPacketHeader = populateTypeAndVersion(injectedAudioPacket, PACKET_TYPE_INJECT_AUDIO);
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currentPacketPosition += numBytesPacketHeader;
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// pack the session UUID for this Node
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QByteArray rfcSessionUUID = NodeList::getInstance()->getOwnerUUID().toRfc4122();
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memcpy(currentPacketPosition, rfcSessionUUID.constData(), rfcSessionUUID.size());
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currentPacketPosition += rfcSessionUUID.size();
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// pick a random UUID to use for this stream
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QUuid randomStreamUUID;
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QByteArray rfcStreamUUID = randomStreamUUID.toRfc4122();
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memcpy(currentPacketPosition, rfcStreamUUID, rfcStreamUUID.size());
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currentPacketPosition += rfcStreamUUID.size();
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// pack the flag for loopback
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memcpy(currentPacketPosition, &_shouldLoopback, sizeof(_shouldLoopback));
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currentPacketPosition += sizeof(_shouldLoopback);
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// pack the position for injected audio
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memcpy(currentPacketPosition, &_position, sizeof(_position));
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currentPacketPosition += sizeof(_position);
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// pack our orientation for injected audio
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memcpy(currentPacketPosition, &_orientation, sizeof(_orientation));
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currentPacketPosition += sizeof(_orientation);
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// pack zero for radius
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float radius = 0;
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memcpy(currentPacketPosition, &radius, sizeof(radius));
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currentPacketPosition += sizeof(radius);
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// pack 255 for attenuation byte
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uchar volume = MAX_INJECTOR_VOLUME * _volume;
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memcpy(currentPacketPosition, &volume, sizeof(volume));
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currentPacketPosition += sizeof(volume);
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timeval startTime = {};
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gettimeofday(&startTime, NULL);
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int nextFrame = 0;
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int currentSendPosition = 0;
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// loop to send off our audio in NETWORK_BUFFER_LENGTH_SAMPLES_PER_CHANNEL byte chunks
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while (currentSendPosition < soundByteArray.size()) {
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int bytesToCopy = std::min(NETWORK_BUFFER_LENGTH_BYTES_PER_CHANNEL,
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soundByteArray.size() - currentSendPosition);
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// copy the next NETWORK_BUFFER_LENGTH_BYTES_PER_CHANNEL bytes to the packet
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memcpy(currentPacketPosition, soundByteArray.data() + currentSendPosition,
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bytesToCopy);
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// grab our audio mixer from the NodeList, if it exists
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Node* audioMixer = nodeList->soloNodeOfType(NODE_TYPE_AUDIO_MIXER);
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if (audioMixer && nodeList->getNodeActiveSocketOrPing(audioMixer)) {
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// send off this audio packet
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nodeList->getNodeSocket().writeDatagram((char*) injectedAudioPacket,
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(currentPacketPosition - injectedAudioPacket) + bytesToCopy,
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audioMixer->getActiveSocket()->getAddress(),
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audioMixer->getActiveSocket()->getPort());
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}
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currentSendPosition += bytesToCopy;
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// send two packets before the first sleep so the mixer can start playback right away
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if (currentSendPosition != bytesToCopy && currentSendPosition < soundByteArray.size()) {
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// not the first packet and not done
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// sleep for the appropriate time
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int usecToSleep = usecTimestamp(&startTime) + (++nextFrame * BUFFER_SEND_INTERVAL_USECS) - usecTimestampNow();
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if (usecToSleep > 0) {
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usleep(usecToSleep);
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}
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}
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}
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}
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emit finished();
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} |