124 lines
4.5 KiB
C#
124 lines
4.5 KiB
C#
/* Copyright (C) 2014 DaikonForge */
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namespace DaikonForge.VoIP
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{
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using UnityEngine;
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/// <summary>
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/// 定义音频采样的频率模式枚举
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/// </summary>
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public enum FrequencyMode
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{
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/// <summary>
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/// 窄频模式
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/// </summary>
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Narrow,
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/// <summary>
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/// 宽频模式
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/// </summary>
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Wide,
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/// <summary>
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/// 超宽频模式
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/// </summary>
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UltraWide
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}
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/// <summary>
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/// 定义一个频率提供器接口，用于根据不同的频率模式提供对应的采样频率
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/// </summary>
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public interface IFrequencyProvider
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{
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/// <summary>
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/// 根据指定的频率模式获取对应的采样频率
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/// </summary>
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/// <param name="mode">频率模式</param>
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/// <returns>采样频率</returns>
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int GetFrequency(FrequencyMode mode);
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}
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/// <summary>
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/// 音频处理的工具类，包含音频重采样、增益调整、获取最大振幅等实用方法
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/// </summary>
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public class AudioUtils
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{
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/// <summary>
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/// 频率提供器实例，使用SpeexCodec中的频率提供器实现
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/// </summary>
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public static IFrequencyProvider FrequencyProvider = new SpeexCodec.FrequencyProvider();
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/// <summary>
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/// 临时存储音频采样数据的快速列表，用于音频重采样时的数据处理
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/// </summary>
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private static FastList<float> temp = new FastList<float>();
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/// <summary>
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/// 根据指定的频率模式获取对应的采样频率
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/// </summary>
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/// <param name="mode">频率模式</param>
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/// <returns>采样频率</returns>
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public static int GetFrequency(FrequencyMode mode)
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{
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return FrequencyProvider.GetFrequency(mode);
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}
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/// <summary>
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/// 对音频采样数据进行重采样，将其从旧的采样频率转换为新的采样频率
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/// </summary>
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/// <param name="samples">音频采样数据数组</param>
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/// <param name="oldFrequency">旧的采样频率</param>
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/// <param name="newFrequency">新的采样频率</param>
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public static void Resample(BigArray<float> samples, int oldFrequency, int newFrequency)
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{
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// 如果新旧采样频率相同，则无需进行重采样操作
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if (oldFrequency == newFrequency) return;
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// 清空临时存储列表，为新的重采样数据做准备
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temp.Clear();
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// 计算新旧采样频率的比率，用于后续索引计算
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float ratio = (float)oldFrequency / (float)newFrequency;
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int outSample = 0;
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// 循环处理，直到超出原采样数据的长度
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while (true)
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{
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// 根据比率计算在原采样数据中的索引
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int inBufferIndex = (int)(outSample++ * ratio);
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if (inBufferIndex < samples.Length)
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// 如果索引在原采样数据长度范围内，则将对应的数据添加到临时列表中
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temp.Add(samples[inBufferIndex]);
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else
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// 超出原采样数据长度，退出循环
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break;
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}
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// 调整采样数据数组的大小，使其与重采样后的数据长度一致
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samples.Resize(temp.Count);
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// 将临时列表中的重采样数据复制回采样数据数组中
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samples.CopyFrom(temp.Items, 0, 0, temp.Count * 4);
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}
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/// <summary>
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/// 对音频采样数据应用增益，即对每个采样值乘以增益系数
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/// </summary>
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/// <param name="samples">音频采样数据数组</param>
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/// <param name="gain">增益系数</param>
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public static void ApplyGain(float[] samples, float gain)
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{
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// 遍历每个采样值，乘以增益系数
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for (int i = 0; i < samples.Length; i++)
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samples[i] *= gain;
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}
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/// <summary>
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/// 获取音频采样数据中的最大振幅
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/// </summary>
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/// <param name="samples">音频采样数据数组</param>
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/// <returns>最大振幅</returns>
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public static float GetMaxAmplitude(float[] samples)
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{
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float max = 0f;
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// 遍历每个采样值，更新最大振幅
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for (int i = 0; i < samples.Length; i++)
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max = Mathf.Max(max, Mathf.Abs(samples[i]));
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return max;
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}
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}
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} |