/// <summary>
/// 设置预处理器属性参数
/// </summary>
/// <param name="setPreprocess">预处理器属性</param>
/// <param name="value">具体参数</param>
/// <returns>0 成功，-1 未知请求</returns>
public int Set(SetPreprocess setPreprocess, int value)
{
IntPtr intPtr = GCHandle.Alloc(value, GCHandleType.Pinned).AddrOfPinnedObject();
int result = SpeexPreprocessApi.Speex_preprocess_ctl(preprocessMemAddress, (int)setPreprocess, intPtr);
return(result);
}
/// <summary>
/// 获取预处理器参数值
/// </summary>
/// <param name="getPreprocess">预处理器属性</param>
/// <returns>预处理器属性值</returns>
public int Get(GetPreprocess getPreprocess)
{
int value = 0;
IntPtr intPtr = GCHandle.Alloc(value, GCHandleType.Pinned).AddrOfPinnedObject();
int result = SpeexPreprocessApi.Speex_preprocess_ctl(preprocessMemAddress, (int)getPreprocess, intPtr);
if (result == 0)
{
result = Marshal.ReadInt32(intPtr);
}
return(result);
}
/// <summary>
/// 执行预处理
/// </summary>
/// <returns>预处理后的音频数据</returns>
public byte[] Run(byte[] input)
{
if (input == null || input.Length > _frameSize * 2)
{
throw new Exception($"值不能为空且每次压缩的数据大小不能超过{_frameSize * 2}个字节");
}
input = SpeexHelper.PadArr(input, _frameSize * 2);
short[] sShort = SpeexHelper.BytesToShorts(input);
int result = SpeexPreprocessApi.Speex_preprocess_run(preprocessMemAddress, sShort);
byte[] output = SpeexHelper.ShortsToBytes(sShort);
return(output);
}
/// <summary>
/// 对预处理器进行后续的清理工作
/// </summary>
public void Dispose()
{
SpeexPreprocessApi.Speex_preprocess_state_destroy(preprocessMemAddress);
GC.Collect();
}
public void Updata()
{
SpeexPreprocessApi.Speex_preprocess_estimate_update(preprocessMemAddress, (short)_frameSize);
}
/// <summary>
/// 初始化Speex预处理实例
/// </summary>
/// <param name="sampling_rate">采样率 8000 16000 32000</param>
/// <param name="frame_size">采样帧大小 对应 10-20ms 的采样帧 一般都是160</param>
public SpeexPreprocess(int sampling_rate, int frameSize = 160)
{
_frameSize = frameSize;
preprocessMemAddress = SpeexPreprocessApi.Speex_preprocess_state_init(_frameSize, sampling_rate);
}
