playlist.h

一款MP3 Player Firmware 的原代码,非常有参考价值

#ifndef PLAYLIST_H
#define PLAYLIST_H 1

#include "malloc.h"

typedef enum {
	MODE_MIN = 0,
	MODE_DIRONLY = 0, // play files sequentially within one directory
	MODE_DIRRAND,     // play files randomly within one directory
	MODE_SEQNTIAL,    // play all files sequentially
	MODE_PLSTRAND,    // play each dir sequentially, but randomly choose dirs
	MODE_KEYRAND,	  // play all files sequentially until a key is pressed
			  // choose randomly from all files on key press
	MODE_ALLRAND,     // play all files randomly
	MODE_MAX = 5
} play_modes_t;


extern const play_modes_t play_mode;


struct playlist_list_struct {
        simm_id name;
	unsigned int num_unrand_files;
        simm_id /* struct playlist_list_struct */ prev_sequential;
        simm_id /* struct playlist_list_struct */ next_sequential;
        simm_id /* struct playlist_struct */ playlist_start_sequential;
        simm_id /* struct playlist_struct */ playlist_end_sequential;
        simm_id /* struct playlist_list_struct */ prev_random;
        simm_id /* struct playlist_list_struct */ next_random;
        simm_id /* struct playlist_struct */ playlist_start_random;
        simm_id /* struct playlist_struct */ playlist_random_head;
        simm_id /* struct playlist_struct */ playlist_random_tail;
	char is_randomized_l;
};

typedef xdata struct playlist_list_struct playlist_list_t;

struct playlist_struct {
        simm_id /* struct filelist_struct */ fl_rec;
	simm_id /* struct playlist_list_struct */ playlist;
        simm_id /* struct playlist_struct */ prev_sequential;
        simm_id /* struct playlist_struct */ next_sequential;
        simm_id /* struct playlist_struct */ prev_random;
        simm_id /* struct playlist_struct */ next_random;
	char is_randomized;
};

typedef xdata struct playlist_struct playlist_t;


typedef union {
	struct {
		unsigned int song_offset;
		unsigned int list_offset;
	} part;
	struct {
		unsigned char song_offset_lsb;
		unsigned char song_offset_msb;
		unsigned char list_offset_lsb;
		unsigned char list_offset_msb;
	} byte;
	unsigned long whole;
} playlist_state_t;



extern simm_id first_playlist;       /* in list of playlists */
extern simm_id last_playlist;        /* in list of playlists */ 

extern simm_id current_playlist;

extern void playlist_init();
extern void playlist_create(simm_id pl_name);
extern void playlist_add_file(simm_id fl_rec);
extern void playlist_show();
extern void playlist_show_all();
extern void playlist_purge_empty(void);

extern void play_mode_next(void);
extern void play_mode_prev(void);
extern void play_mode_toggle(void);
extern void save_play_mode(void);
extern void play_mode_set(play_modes_t new_play_mode);
extern void play_mode_change(void);

extern simm_id next_file_ptr(playlist_t *p, unsigned char keyflag);
extern simm_id prev_file_ptr(playlist_t *p);
extern simm_id next_playlist_ptr(playlist_t *p, unsigned char keyflag);
extern simm_id prev_playlist_ptr(playlist_t *p);

extern unsigned long playlist_to_state(playlist_t *p);
extern simm_id state_to_playlist(unsigned long state_in);

extern void playlist_show_rand(void);

#define next_file(ID, KEY) (next_file_ptr((playlist_t *)addr6(ID), KEY))
#define prev_file(ID) (prev_file_ptr((playlist_t *)addr6(ID)))
#define next_playlist(ID, KEY) (next_playlist_ptr((playlist_t *)addr6(ID), KEY))
#define prev_playlist(ID) (prev_playlist_ptr((playlist_t *)addr6(ID)))


#endif