/// <summary>
/// 设置编码器属性
/// </summary>
/// <param name="setState">目标编码器属性</param>
/// <param name="value">设置的值</param>
/// <returns> 0 没有错误，-1为未知请求，-2为无效参数</returns>
public int SetEncode(SetCoderState setState, int value)
{
IntPtr intPtr = GCHandle.Alloc(value, GCHandleType.Pinned).AddrOfPinnedObject();
int result = SpeexEncodeApi.Speex_encoder_ctl(_encodeStateIntptr, (int)setState, intPtr);
return(result);
}
/// <summary>
/// 对Speex编解码器进行后续的清理工作
/// </summary>
public void Dispose()
{
SpeexEncodeApi.Speex_encoder_destroy(_encodeStateIntptr);
SpeexDecodeApi.Speex_decoder_destroy(_decodeStateIntptr);
SpeexBitsApi.Speex_bits_destroy(ref _encodeSpeexBits);
SpeexBitsApi.Speex_bits_destroy(ref _decodeSpeexBits);
GC.Collect();
}
/// <summary>
/// 初始化Speex编解码器实例
/// </summary>
/// <param name="quality">压缩质量，值越大压缩比越小，音质越清晰，有效范围 1-10</param>
/// <param name="modelType">编码器类型</param>
public SpeexBase(ModelType modelType, int quality)
{
_encodeStateIntptr = SpeexEncodeApi.Speex_encoder_init(SpeexCommon.Speex_lib_get_mode((int)modelType)); //初始化模式结构体 拿到state指针
_decodeStateIntptr = SpeexDecodeApi.Speex_decoder_init(SpeexCommon.Speex_lib_get_mode((int)modelType)); //初始化模式结构体 拿到state指针
SpeexBitsApi.Speex_bits_init(ref _encodeSpeexBits); //初始化数据结构体
SpeexBitsApi.Speex_bits_init(ref _decodeSpeexBits); //初始化数据结构体
this.SetEncode(SetCoderState.Quality, quality);
}
/// <summary>
/// 获取编码器设置
/// </summary>
/// <param name="getState">目标编码器属性</param>
/// <returns>编码器属性值 -1为未知请求，-2为无效参数</returns>
public int GetEncode(GetCoderState getState)
{
int value = 0;
IntPtr intPtr = GCHandle.Alloc(value, GCHandleType.Pinned).AddrOfPinnedObject();
int result = SpeexEncodeApi.Speex_encoder_ctl(_encodeStateIntptr, (int)getState, intPtr);
if (result == 0)
{
result = Marshal.ReadInt32(intPtr);
}
return(result);
}
/// <summary>
/// 压缩音频数据
/// </summary>
/// <param name="input">需要压缩的音频字节流</param>
/// <returns>压缩后的Speex数据流</returns>
public byte[] EncodeBase(byte[] input)
{
if (input == null || input.Length > 320)
{
throw new Exception("值不能为空且每次压缩的数据大小不能超过320个字节");
}
input = SpeexHelper.PadArr(input, 320);
SpeexBitsApi.Speex_bits_reset(ref _encodeSpeexBits);
short[] sShort = SpeexHelper.BytesToShorts(input);
//float[] sInput = SpeexHelper.ShortsToFloats(sShort);
int i = SpeexEncodeApi.Speex_encode_int(_encodeStateIntptr, sShort, ref _encodeSpeexBits);
int len = SpeexBitsApi.Speex_bits_nbytes(ref _encodeSpeexBits);
byte[] outBuffer = new byte[len];
int outResult = SpeexBitsApi.Speex_bits_write(ref _encodeSpeexBits, outBuffer, outBuffer.Length);
return(outBuffer.Take(outResult).ToArray());
}
