public byte[] Decode(byte[] data)
{
if (!_inited)
{
uint samplerate = 0;
byte channels = 0;
lock (_lock)
{
var r = NeAACDecInit(_handle, data, (uint)data.Length, ref samplerate, ref channels);
if (r == 0)
{
_inited = true;
}
}
}
if (_inited)
{
NeAACDecFrameInfo info = new NeAACDecFrameInfo();
var pcm = NeAACDecDecode(_handle, ref info, data, data.Length);
try
{
int bufferLenth = info.samples * info.channels;
if (bufferLenth > 0 && bufferLenth <= 4096)
{
byte[] pcm_data = FunctionEx.IntPtrToBytes(pcm, 0, (info.samples * info.channels));
byte[] frame_mono = new byte[2048];
if (info.channels == 1)
{
return(pcm_data);
}
else if (info.channels == 2)
{
//从双声道的数据中提取单通道
for (int i = 0, j = 0; i < 4096 && j < 2048; i += 4, j += 2)
{
frame_mono[j] = pcm_data[i];
frame_mono[j + 1] = pcm_data[i + 1];
}
return(frame_mono);
}
}
}
catch (Exception ex)
{
}
}
return(new byte[0]);
}
//void* NEAACDECAPI NeAACDecDecode(NeAACDecHandle hDecoder,
// NeAACDecFrameInfo *hInfo,
// unsigned char *buffer,
// unsigned long buffer_size);
private extern static IntPtr NeAACDecDecode(IntPtr hDecoder,
ref NeAACDecFrameInfo hInfo,
byte[] buffer,
int buffer_size);
