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152 lines
3.9 KiB
152 lines
3.9 KiB
namespace Oculus.Platform
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{
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using UnityEngine;
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using System;
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using System.Collections.Generic;
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public class VoipAudioSourceHiLevel : MonoBehaviour
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{
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// This is a delegate that exists as a surface for OnAudioFilterRead
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// It will be callled on unity's audio thread
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public class FilterReadDelegate : MonoBehaviour
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{
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public VoipAudioSourceHiLevel parent;
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float[] scratchBuffer;
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void Awake()
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{
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int bufferSizeElements = (int)CAPI.ovr_Voip_GetOutputBufferMaxSize();
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scratchBuffer = new float[bufferSizeElements];
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}
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void OnAudioFilterRead(float[] data, int channels)
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{
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int sizeToFetch = data.Length / channels;
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int sourceBufferSize = sizeToFetch;
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if (sourceBufferSize > scratchBuffer.Length)
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{
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Array.Clear(data, 0, data.Length);
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throw new Exception(string.Format("Audio system tried to pull {0} bytes, max voip internal ring buffer size {1}", sizeToFetch, scratchBuffer.Length));
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}
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int available = parent.pcmSource.PeekSizeElements();
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if (available < sourceBufferSize)
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{
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if (verboseLogging)
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{
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Debug.LogFormat(
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"Voip starved! Want {0}, but only have {1} available",
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sourceBufferSize,
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available);
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}
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return;
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}
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int copied = parent.pcmSource.GetPCM(scratchBuffer, sourceBufferSize);
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if (copied < sourceBufferSize)
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{
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Debug.LogWarningFormat(
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"GetPCM() returned {0} samples, expected {1}",
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copied,
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sourceBufferSize);
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return;
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}
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int dest = 0;
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float tmpPeakAmp = -1;
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for (int i = 0; i < sizeToFetch; i++)
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{
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float val = scratchBuffer[i];
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for (int j = 0; j < channels; j++)
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{
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data[dest++] = val;
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if (val > tmpPeakAmp)
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{
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tmpPeakAmp = val;
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}
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}
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}
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parent.peakAmplitude = tmpPeakAmp;
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}
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}
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int initialPlaybackDelayMS;
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public UInt64 senderID
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{
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set
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{
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pcmSource.SetSenderID(value);
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}
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}
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public AudioSource audioSource;
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public float peakAmplitude;
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protected IVoipPCMSource pcmSource;
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static int audioSystemPlaybackFrequency;
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static bool verboseLogging = false;
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protected void Stop() {}
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VoipSampleRate SampleRateToEnum(int rate) {
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switch(rate) {
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case 48000:
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return VoipSampleRate.HZ48000;
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case 44100:
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return VoipSampleRate.HZ44100;
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case 24000:
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return VoipSampleRate.HZ24000;
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default:
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return VoipSampleRate.Unknown;
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}
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}
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protected void Awake()
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{
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CreatePCMSource();
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if(audioSource == null) {
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audioSource = gameObject.AddComponent<AudioSource>();
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}
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audioSource.gameObject.AddComponent<FilterReadDelegate>();
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var filterDelegate = audioSource.gameObject.GetComponent<FilterReadDelegate>();
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filterDelegate.parent = this;
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initialPlaybackDelayMS = 40;
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audioSystemPlaybackFrequency = AudioSettings.outputSampleRate;
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CAPI.ovr_Voip_SetOutputSampleRate(SampleRateToEnum(audioSystemPlaybackFrequency));
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if(verboseLogging) {
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Debug.LogFormat("freq {0}", audioSystemPlaybackFrequency);
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}
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}
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void Start() {
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audioSource.Stop();
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}
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protected virtual void CreatePCMSource()
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{
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pcmSource = new VoipPCMSourceNative();
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}
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protected static int MSToElements(int ms) {
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return ms * audioSystemPlaybackFrequency / 1000;
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}
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void Update()
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{
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pcmSource.Update();
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if (!audioSource.isPlaying && pcmSource.PeekSizeElements() >= MSToElements(initialPlaybackDelayMS)) {
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if(verboseLogging) {
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Debug.LogFormat("buffered {0} elements, starting playback", pcmSource.PeekSizeElements());
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}
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audioSource.Play();
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}
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}
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}
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}
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