c++ - decoding of APE (Monkey's Audio) using FFmpeg -

i developing player plays different audio formats,i have played mp3,acc,wav,ogg,alac,flac formats. stuck on ape or monkey's audio format, using open source library ffmpeg decoding.can tell me how decode ape format,i successful in creating packets,storing in buffer , passing ffmpeg in same fashion did other formats,but ffmpeg not able decode packets.can tell me wrong doing? should buffer size in case of ape needs passed ffmpeg.also header parsing, decode function of ffmpeg avcodec_decode_audio3.