mpc3000.all.v3.ksy

meta:
  id: mpc3000_all_v3
  file-extension: all
  bit-endian: le
  imports:
    - mpc3000.seq.v3
    
seq:
  - id: all_file_header
    type: all_file_header
    
  - id: sequences
    type: sequence
    repeat: until
    # We check against -1 because event parsing is based on always parsing the
    # status byte for the next event.
    repeat-until: (_io.pos - 6) -
                  all_file_header.total_number_of_bytes_in_all_sequences == -1

  - id: songs
    type: song
    repeat: until
    repeat-until: songs[_index - 1].number_of_steps == 0x00

types:
  all_file_header:
    seq:
    - id: file_id
      contents: [0x04]
    
    - id: file_version
      contents: [0x03]
      
    - id: total_number_of_bytes_in_all_sequences
      type: u4le
      
  sequence:
    seq:
    - id: misc_chunks
      type: misc_chunks
    
    - id: events
      type: 'mpc3000_seq_v3::event(
        _index == 0,
        _index > 0 ? events[_index - 1].next_status : 0xFF, 
        misc_chunks.sequence_header.sequence_length_in_bytes.value -
          (_io.pos - misc_chunks.position_after_tempo_changes))'
      
      repeat: until
      repeat-until: misc_chunks.sequence_header.sequence_length_in_bytes.value -
          (_io.pos - misc_chunks.position_after_tempo_changes) == 0
      
  misc_chunks:
    seq:
    - id: sequence_header
      type: mpc3000_seq_v3::sequence_header
      
    - id: smpte_offset
      type: mpc3000_seq_v3::smpte_offset
    
    - id: mixer
      type: mpc3000_seq_v3::mixer
      repeat: expr
      repeat-expr: 64
      
    - size: 2
    
    - id: delays
      type: mpc3000_seq_v3::delays
      
    - size: 3
    
    - size: 16
    
    - id: last_active_track
      type: u1
      
    - id: number_of_tempo_changes
      type: u1
      
    - id: number_of_active_track_headers
      type: u1
    
    - id: track_headers
      type: mpc3000_seq_v3::track_header
      repeat: expr
      repeat-expr: number_of_active_track_headers
    
    - id: tempo_changes
      type: mpc3000_seq_v3::tempo_change
      repeat: expr
      repeat-expr: number_of_tempo_changes
    
    instances:
      position_after_tempo_changes:
        value: _io.pos
        
  song:
    seq:
    # This may be 0xFF if there's still a terminator byte to be
    # parsed from the last sequence, in which case we must still
    # parse songs.
    # It may also be 0x00, indicating the end of the ALL file.
    - id: number_of_steps
      type: u1
    
    - id: song_body
      type: song_body
      if: number_of_steps != 0x00 and number_of_steps != 0xFF
    
    types:
      song_body:
        seq:
        - id: song_number
          type: u1
        - id: end_status
          type: u1
          enum: end_status
        - id: loop_back_step_number
          type: u1
        - id: song_name
          type: str
          encoding: ASCII
          terminator: 0x20
          size: 16
        - id: smpte_offset
          type: mpc3000_seq_v3::smpte_offset
        - id: steps
          type: step
          repeat: expr
          repeat-expr: _parent.number_of_steps
        
        types:
          step:
            seq:
            - id: sequence_number
              type: u1
            - id: repetition_count
              type: u1
      
        enums:
          end_status:
            0: stop_at_end
            1: loop_to_a_step