libnjb: /tmp/libnjb-2.2.6/src/protocol3.c File Reference

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# protocol3.c File Reference

`#include <stdio.h>`
`#include <stdlib.h>`
`#include <fcntl.h>`
`#include <errno.h>`
`#include <string.h>`
`#include "libnjb.h"`
`#include "protocol.h"`
`#include "protocol3.h"`
`#include "unicode.h"`
`#include "byteorder.h"`
`#include "njb_error.h"`
`#include "usb_io.h"`
`#include "ioutil.h"`
`#include "defs.h"`
`#include "base.h"`
`#include "eax.h"`
`#include "datafile.h"`
`#include "njbtime.h"`

## Functions
int | njb3_init_state (njb_t *njb)
int | njb3_capture (njb_t *njb)
int | njb3_release (njb_t *njb)
int | njb3_get_codecs (njb_t *njb)
int | njb3_ping (njb_t *njb, int type)
int | njb3_power_status (njb_t *njb, int *battery_level, int *charging, int *ac_power)
int | njb3_readid (njb_t *njb, u_int8_t *sdmiid)
int | njb3_get_disk_usage (njb_t *njb, u_int64_t *totalbytes, u_int64_t *freebytes)
int | njb3_turnoff_flashing (njb_t *njb)
int | njb3_get_owner_string (njb_t *njb, char *name)
int | njb3_set_owner_string (njb_t *njb, const char *name)
njb_time_t * | njb3_get_time (njb_t *njb)
int | njb3_set_bitmap (njb_t *njb, u_int16_t x_size, u_int16_t y_size, const unsigned char *bitmap)
int | njb3_current_track (njb_t *njb, u_int16_t *position)
int | njb3_elapsed_time (njb_t *njb, u_int16_t *elapsed, int *change)
int | njb3_queue_track (njb_t *njb, u_int32_t trackid)
int | njb3_play_track (njb_t *njb, u_int32_t trackid)
int | njb3_seek_track (njb_t *njb, u_int32_t pos)
int | njb3_clear_play_queue (njb_t *njb)
int | njb3_ctrl_playing (njb_t *njb, int cmd)
int | njb3_set_time (njb_t *njb, njb_time_t *time)
int | njb3_reset_get_track_tag (njb_t *njb)
njb_songid_t * | njb3_get_next_track_tag (njb_t *njb)
int | njb3_reset_get_playlist_tag (njb_t *njb)
njb_playlist_t * | njb3_get_next_playlist_tag (njb_t *njb)
int | njb3_reset_get_datafile_tag (njb_t *njb)
njb_datafile_t * | njb3_get_next_datafile_tag (njb_t *njb)
njb_keyval_t * | njb3_get_keys (njb_t *njb)
int | njb3_read_keys (njb_t *njb)
int | njb3_request_file_chunk (njb_t *njb, u_int32_t fileid, u_int32_t offset)
int | njb3_get_file_block (njb_t *njb, unsigned char *data, u_int32_t maxsize)
u_int32_t | njb3_create_file (njb_t *njb, unsigned char *ptag, u_int32_t tagsize, u_int16_t database)
u_int32_t | njb3_send_file_chunk (njb_t *njb, unsigned char *chunk, u_int32_t chunksize, u_int32_t fileid)
int | njb3_send_file_complete (njb_t *njb, u_int32_t fileid)
int | njb3_create_folder (njb_t *njb, const char *name, u_int32_t *folderid)
int | njb3_delete_item (njb_t *njb, u_int32_t itemid)
int | njb3_update_16bit_frame (njb_t *njb, u_int32_t itemid, u_int16_t frameid, u_int16_t value)
int | njb3_update_string_frame (njb_t *njb, u_int32_t itemid, u_int16_t frameid, unsigned char *str)
int | njb3_update_tag (njb_t *njb, u_int32_t itemid, unsigned char *ptag, u_int32_t ptagsize)
int | njb3_create_playlist (njb_t *njb, char *name, u_int32_t *plid)
int | njb3_add_multiple_tracks_to_playlist (njb_t *njb, u_int32_t *plid, u_int32_t *trids, u_int16_t ntracks)
int | njb3_control_eax_processor (njb_t *njb, u_int16_t state)
int | njb3_adjust_eax (njb_t *njb, u_int16_t eaxid, u_int16_t patchindex, u_int16_t active, u_int16_t scalevalue)
void | njb3_read_eaxtypes (njb_t *njb)
njb_eax_t * | njb3_get_nexteax (njb_t *njb)
int | njb3_announce_firmware (njb_t *njb, u_int32_t size)
u_int32_t | njb3_send_firmware_chunk (njb_t *njb, u_int32_t chunksize, unsigned char *chunk)
int | njb3_get_firmware_confirmation (njb_t *njb)
void | njb3_destroy_state (njb_t *njb)
## Variables
int | __sub_depth

## Detailed Description

This file contains the protocol code for the series 3 devices. This protocol is believed to have the internal name "PDE" at Creative.

## Function Documentation

int njb3_add_multiple_tracks_to_playlist | ( | njb_t * | njb,
|  | u_int32_t * | plid,
|  | u_int32_t * | trids,
|  | u_int16_t | ntracks |
| ) |  |  |

This takes an array of 32-bit track ID:s and adds it to a certain playlist.

Parameters:

  | plid | a pointer to the ID of the playlist to add tracks to. The ID will change during this operation, so it is important to pass in a pointer.
  | trids | an array of tracks to add
  | ntracks | absolute number of tracks in the array.

int njb3_announce_firmware | ( | njb_t * | njb,
|  | u_int32_t | size |
| ) |  |  |

This announces a firmware image which will then be sent in several chunks.

Parameters:

  | njb | a pointer to the njb device object to use
  | size | the total size of the firmware image

Returns:
  0 on success, -1 on failure

int njb3_control_eax_processor | ( | njb_t * | njb,
|  | u_int16_t | state |
| ) |  |  |

This command turns the EAX DSP processor on or off. You will also have to adjust the currently used EAX effect with njb3_adjust_eax() below.

int njb3_create_playlist | ( | njb_t * | njb,
|  | char * | name,
|  | u_int32_t * | plid |
| ) |  |  |

This function creates a new playlist on the device.

Parameters:

  | name | the name of the playlist to create, as a string.
  | plid | a pointer to a 32-bit numer that will contain the new playlist ID after this routine has been called.

Returns:
  0 on success, -1 on failure.

void njb3_destroy_state | ( | njb_t * | njb | ) |

Cleans up any dangling lists in the njb_t state holder struct, and other stuff related to the state.

int njb3_get_codecs | ( | njb_t * | njb | ) |

Reads the supported audio file types.

int njb3_get_file_block | ( | njb_t * | njb,
|  | unsigned char * | data,
|  | u_int32_t | maxsize |
| ) |  |  |

This function retrieves a part of the requested chunk. Short reads are allowed, so the caller must make sure that it is called as many times as is needed to retrieve the entire file chunk.

Parameters:

  | data | an allocated byte array to store the retrieved chunk in.
  | maxsize | the maximum number of bytes to retrieve from this chunk at a time.

int njb3_get_firmware_confirmation | ( | njb_t * | njb | ) |

This simply reads back the device status after a firmware upgrade.

int njb3_init_state | ( | njb_t * | njb | ) |

Initializes the basic state of the njb->protocol_state for the PROTOCOL3-devices.

int njb3_power_status | ( | njb_t * | njb,
|  | int * | battery_level,
|  | int * | charging,
|  | int * | ac_power |
| ) |  |  |

This function reads out the current battery level and charging status from a series 3 device.

Parameters:

  | battery_level | a variable that will hold the current level after the call.
  | charging | if the battery is charging, this variable will hold 1 after the call, else 0.
  | ac_power | if the charger is connected, this variable will hold 1 after the call, else 0.

Returns:
  0 on success, -1 on failure. If the call fails, all other return values are invalid.

int njb3_request_file_chunk | ( | njb_t * | njb,
|  | u_int32_t | fileid,
|  | u_int32_t | offset |
| ) |  |  |

This function requests a chunk from a certain file. The offset may index into the file. The chunk transfer size is 1MB by default (as used by creative) but may actually exceed that.

Returns actual chunk size or -1 if failed.

int njb3_reset_get_datafile_tag | ( | njb_t * | njb | ) |

This routine retrieves the list of datafiles, and returns the first item.

int njb3_reset_get_playlist_tag | ( | njb_t * | njb | ) |

This routine retrieves the list of playlists, while also filling in each playlist post with it's respective track ID:s.

u_int32_t njb3_send_firmware_chunk | ( | njb_t * | njb,
|  | u_int32_t | chunksize,
|  | unsigned char * | chunk |
| ) |  |  |

This sends a chunk of firmware. Typically the chunks are `NJB3_FIRMWARE_CHUNK_SIZE` each, except for the last chunk.

Parameters:

  | njb | a pointer to the njb device object to use
  | chunksize | the size of this chunk
  | chunk | a pointer to the raw bytes representing this firmware chunk

Returns:
  0 on success, -1 on failure

int njb3_set_bitmap | ( | njb_t * | njb,
|  | u_int16_t | x_size,
|  | u_int16_t | y_size,
|  | const unsigned char * | bitmap |
| ) |  |  |

NJB2 only (shall be expanded for all jukeboxes). Set up the black/white bitmap shown on shutdown.

The bitmap must be exactly 1088 bytes large, coded as a serial bitmap of 136x64 pixels. The final 4 bits per line are not shown, because the the display of the NJB2 has only 132x64 pixels.

A set pixel (1) means dark, an unset means white.

To create a compatible bitmap, take a 132x64 PBM file (of course not a ASCII-coded, but a binary "P4") and cut off the header.

Explaination of the JBM1 file format:

     Byte offset:     Contents:
     0x00 - 0x03      "JBM1"
     0x04 - 0x05      width of bitmap in pixels 16bit
                      unsigned bigendian integer
     0x06 - 0x07      height of bitmap in pixels 16bit
                      unsigned bigendian integer
     0x08 - 0x0b      file format version? contains 0x00000001
                      as a 32bit unsigned bigendian integer
     0x0c - fileend   actual bitmap data

The bitmap data is black-and-white and each bit represents a single pixel. A set pixel is 1 and a cleared pixel is 0. The bitmap is stored in 16bit unsigned integers which are little-endian, and each of these 16bit integers form a vertical, eight-pixel high and two-pixel wide "bar".

int njb3_update_16bit_frame | ( | njb_t * | njb,
|  | u_int32_t | itemid,
|  | u_int16_t | frameid,
|  | u_int16_t | value |
| ) |  |  |

This function will update a single 16bit metadata frame associated with a certain item (track, playlist or datafile). Only call this function to modify 16-bit values!

Parameters:

  | itemid | the item ID (track, playlist or datafile) to modify.
  | frameid | the frame ID of the frame to modyfy. Must be a 16-bit frame.
  | valud | the new 16-bit value.

int njb3_update_string_frame | ( | njb_t * | njb,
|  | u_int32_t | itemid,
|  | u_int16_t | frameid,
|  | unsigned char * | str |
| ) |  |  |

This function updates a single string of metadata associated with a certain item (track, playlist or datafile). Only call this routine to modify string frames!

Parameters:

  | itemid | the item ID (track, playlist or datafile) to be modified.
  | frameid | the frame ID of the frame to be updated.
  | str | the new string value.

int njb3_update_tag | ( | njb_t * | njb,
|  | u_int32_t | itemid,
|  | unsigned char * | ptag,
|  | u_int32_t | ptagsize |
| ) |  |  |

A function to update a block of metadata on the series 3 devices.

Parameters:

  | itemid | the track (or similar) whose metadata is to be updated.
  | ptag | a packed metadata structure for series 3 devices.

Returns:
  0 on success, -1 on failure.

## Variable Documentation

int __sub_depth

The current subroutine depth for all of libnjb (global)