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126 lines
2.9 KiB
126 lines
2.9 KiB
//#define VERBOSE_LOGGING
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using UnityEngine;
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using System.Collections;
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using System;
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using Oculus.Platform;
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public class BufferedAudioStream {
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const bool VerboseLogging = false;
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AudioSource audio;
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float[] audioBuffer;
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int writePos;
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const float bufferLengthSeconds = 0.25f;
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const int sampleRate = 48000;
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const int bufferSize = (int)(sampleRate * bufferLengthSeconds);
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const float playbackDelayTimeSeconds = 0.05f;
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float playbackDelayRemaining;
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float remainingBufferTime;
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public BufferedAudioStream(AudioSource audio) {
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audioBuffer = new float[bufferSize];
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this.audio = audio;
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audio.loop = true;
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audio.clip = AudioClip.Create("", bufferSize, 1, sampleRate, false);
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Stop();
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}
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public void Update () {
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if(remainingBufferTime > 0)
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{
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#if VERBOSE_LOGGING
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Debug.Log(string.Format("current time: {0}, remainingBufferTime: {1}", Time.time, remainingBufferTime));
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#endif
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if (!audio.isPlaying && remainingBufferTime > playbackDelayTimeSeconds)
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{
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playbackDelayRemaining -= Time.deltaTime;
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if (playbackDelayRemaining <= 0)
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{
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#if VERBOSE_LOGGING
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Debug.Log("Starting playback");
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#endif
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audio.Play();
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}
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}
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if (audio.isPlaying)
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{
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remainingBufferTime -= Time.deltaTime;
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if (remainingBufferTime < 0)
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{
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remainingBufferTime = 0;
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}
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}
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}
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if (remainingBufferTime <= 0)
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{
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if (audio.isPlaying)
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{
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Debug.Log("Buffer empty, stopping " + DateTime.Now);
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Stop();
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}
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else
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{
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if (writePos != 0)
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{
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Debug.LogError("writePos non zero while not playing, how did this happen?");
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}
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}
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}
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}
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void Stop()
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{
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audio.Stop();
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audio.time = 0;
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writePos = 0;
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playbackDelayRemaining = playbackDelayTimeSeconds;
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}
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public void AddData(float[] samples) {
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int remainingWriteLength = samples.Length;
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if(writePos > audioBuffer.Length) {
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throw new Exception();
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}
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do {
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int writeLength = remainingWriteLength;
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int remainingSpace = audioBuffer.Length - writePos;
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if(writeLength > remainingSpace) {
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writeLength = remainingSpace;
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}
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Array.Copy(samples, 0, audioBuffer, writePos, writeLength);
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remainingWriteLength -= writeLength;
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writePos += writeLength;
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if(writePos > audioBuffer.Length) {
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throw new Exception();
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}
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if(writePos == audioBuffer.Length) {
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writePos = 0;
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}
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} while(remainingWriteLength > 0);
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#if VERBOSE_LOGGING
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float prev = remainingBufferTime;
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#endif
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remainingBufferTime += (float)samples.Length / sampleRate;
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#if VERBOSE_LOGGING
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Debug.Log(string.Format("previous remaining: {0}, new remaining: {1}, added {2} samples", prev, remainingBufferTime, samples.Length));
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#endif
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audio.clip.SetData(audioBuffer, 0);
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}
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}
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