SharpJaad 0.1.1

SharpJaad

JAAD is an AAC decoder and MP4 demultiplexer library written completely in Java. It uses no native libraries, is platform-independent and portable. It can read MP4 container from almost every input-stream (files, network sockets etc.) and decode AAC-LC (Low Complexity) and HE-AAC (High Efficiency/AAC+).

SharpJaad is a netstandard2.0 port of the original Java code base with a few small fixes. It has no third-party dependencies and it's portable as it does not use any platform-specific APIs.

👁 NuGet version

SharpJaad.AAC

SharpJaad.AAC is just the AAC decoder without any MP4 code. It's well suited for applications in RTP where the MP4 container is not needed.

👁 NuGet version

Example

To decode stereo AAC Low Complexity (AAC-LC) with 44.1kHz, start with creating the configuration:

var decoderConfig = new DecoderConfig();
decoderConfig.SetProfile(Profile.AAC_LC);
decoderConfig.SetSampleFrequency(SampleFrequency.SAMPLE_FREQUENCY_44100);
decoderConfig.SetChannelConfiguration((ChannelConfiguration)2);

Create the decoder:

var aacDecoder = new Decoder(decoderConfig);

Create an output buffer for the result:

SampleBuffer buffer = new SampleBuffer();
buffer.SetBigEndian(false);

Decode the AAC frame:

byte[] aacFrame = { ... } // AAC frame to decode
aacDecoder.DecodeFrame(aacFrame, buffer);

Convert it to PCM:

short[] pcm = new short[buffer.Data.Length / sizeof(short)];
Buffer.BlockCopy(buffer.Data, 0, pcm, 0, buffer.Data.Length);

SharpJaadMain

A sample application that can extract AAC audio from a (MP4) file and transcode it into a WAV file.

Credits

This is a port of the https://sourceforge.net/projects/jaadec/ into C#.