/// <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>
/// 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>
/// 解压Speex音频数据流
/// </summary>
/// <param name="input">需要解压的数据流</param>
/// <returns>解压后的正常音频数据</returns>
public byte[] DecodeBase(byte[] input)
{
SpeexBitsApi.Speex_bits_reset(ref _decodeSpeexBits);
SpeexBitsApi.Speex_bits_read_from(ref _decodeSpeexBits, input, input.Length);
//int i = SpeexBitsApi.Speex_bits_nbytes(ref _decodeSpeexBits);
short[] buffer = new short[160];
int len = SpeexDecodeApi.Speex_decode_int(_decodeStateIntptr, ref _decodeSpeexBits, buffer);
return(SpeexHelper.ShortsToBytes(buffer));
}
