/// <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>
/// 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());
}
/// <summary>
/// 基于SpeexCore的具体压缩示例实现
/// 规则 压缩：压缩数据个数+压缩数据 如：byte[42]=byte[4]+byte[38] byte[24]=byte[4]+byte[20] ...
/// 根据质量压缩出来的数据个数的int值在内存中的占用数据+压缩数据
/// 解压：按当前规则动态解析
/// </summary>
/// <param name="input">正常的全部音频数据</param>
/// <returns>压缩后并组合的Speex数据</returns>
public byte[] Encode(byte[] input)
{
input = SpeexHelper.PadArr(input, 320);//补足320 的倍数
int i = 0;
IEnumerable <byte> nbyte = null;
List <byte> receive = new List <byte>();
while ((nbyte = input.Skip(i).Take(320)).Count() != 0)
{
byte[] rec = base.EncodeBase(nbyte.ToArray());
byte[] lenByte = BitConverter.GetBytes(rec.Length);
receive.AddRange(lenByte);
receive.AddRange(rec);
Console.WriteLine(i);
i += 320;
}
return(receive.ToArray());
}