Photo CD has been specified by Kodak and Philips based on the CD-i Bridge specification. It comprises the following:

  • General Disc format including example of program area layout, index table, volume descriptor, data area, subcode Q-channel skew, CD-DA clips and microcontroller readable sectors
  • Data retrieval structures including directory structure, the INFO.PCD file and microcontroller readable sectors system
  • Image data coding including a description of image coding and image packs
  • ADPCM files for simultaneous playback of audio and images