PCM to AAC conversion using mediacodec

Question

I am using a media codec class in Android (Jelly Bean) to encode PCM format to AAC. The file was encoded but no music player is able to play that file. I was not able to find an

Answer 1

You'll need to choose a container for it. I prefer adts.

Copy the the payload data into an aray that is large enough for your container, just add on your bits. So after scouring the internet for my solution I worked some snippet into place

method 'fillInADTSHeader'

    profile =( configParams[0]>>3 )&0x1f;

    frequency_index = (this.configParams[0]&0x7) <<1 | (this.configParams[1]>>7) &0x1;

    channel_config = (this.configParams[1]>>3) &0xf;

    int finallength = encoded_length + 7;       
    ENCodedByteArray[0] = (byte) 0xff;
    ENCodedByteArray[1] = (byte) 0xf1;
    ENCodedByteArray[2] = (byte) ( ((profile - 1) << 6) + (frequency_index << 2) +(channel_config >> 2));
    ENCodedByteArray[3] = (byte) (((channel_config & 0x3) << 6) + (finallength >> 11));
    ENCodedByteArray[4] = (byte)( (finallength & 0x7ff) >> 3);
    ENCodedByteArray[5] = (byte) (((finallength & 7) << 5) + 0x1f) ;
    ENCodedByteArray[6] = (byte) 0xfc;

Using something like

            byte chunkADTS[]=new byte[info.size + 7];
            fillInADTSHeader(chunkADTS,info.size);
            outputBuffers[bR].get(chunkADTS,7,info.size);
            buffer.pushData(chunkADTS);

Should play in shoutcast, etc...

Answer 2

There's an android AAC Library https://github.com/timsu/android-aac-enc

Try passing your buffers through this library. It might help.