This part is a kind of semiconductor called VS1053B.

Function of this product has Ogg Vorbis/MP3/AAC/WMA/MIDI AUDIO CODEC.

Manufacturers : VLSI

Image and pinout :

Some of the text within the PDF file :

VS1053b VS1053 B VS1053b Ogg Vorbis/MP3/AAC/WMA/MIDI AUDIO CODEC Features Description • Decodes Ogg Vorbis; VS1053b is a single-chip Ogg Vorbis/MP3/AAC/MPEG 1 & 2 audio layer III (CBR +VBR WMA/MIDI audio decoder and an IMA ADPCM +ABR); layers I & II optional; and user-loadable Ogg Vorbis encoder. It contains MPEG4 / 2 AAC-LC(+PNS), a high-performance, proprietary low-power DSP HE-AAC v2 (Level 3) (SBR + PS); processor core VS DSP4 , working data memory, WMA 4.0/4.1/7/8/9 all profiles (5-384 kbps); 16 KiB instruction RAM and 0.5+ KiB data RAM WAV (PCM + IMA ADPCM); for user applications running simultaneously with General MIDI 1 / SP-MIDI format 0 files any built-in decoder, serial control and input data • Encodes Ogg Vorbis with software pluinterfaces, upto 8 general purpose I/O pi [ ... ]

VS1053B PDF Datasheet Download