playlist_viewer.c

编译后直接运行的ＭＰ３播放器全部Ｃ语言源代码 一个包含FAT文件系统、系统引导 Boot、FLASH Driver等内容的

/***************************************************************************
 *
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id: playlist_viewer.c,v 1.7 2004/02/01 04:35:28 hardeeps Exp $
 *
 * Copyright (C) 2003 Hardeep Sidhu
 *
 * All files in this archive are subject to the GNU General Public License.
 * See the file COPYING in the source tree root for full license agreement.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/

#include <string.h>
#include <sprintf.h>
#include "playlist.h"
#include "mpeg.h"
#include "screens.h"
#include "status.h"
#include "settings.h"
#include "icons.h"
#include "menu.h"
#include "plugin.h"
#include "keyboard.h"
#include "tree.h"
#include "onplay.h"

#ifdef HAVE_LCD_BITMAP
#include "widgets.h"
#endif

#include "lang.h"

#include "playlist_viewer.h"

/* Defines for LCD display purposes.  Taken from tree.c */
#ifdef HAVE_LCD_BITMAP
    #define CURSOR_X        (global_settings.scrollbar && \
                             viewer.num_tracks>viewer.num_display_lines?1:0)
    #define CURSOR_Y        0 
    #define CURSOR_WIDTH    (global_settings.invert_cursor ? 0 : 4)

    #define ICON_WIDTH      ((viewer.char_width > 6) ? viewer.char_width : 6)

    #define MARGIN_X        ((global_settings.scrollbar && \
                             viewer.num_tracks > viewer.num_display_lines ? \
                             SCROLLBAR_WIDTH : 0) + CURSOR_WIDTH + \
                             (global_settings.playlist_viewer_icons ? \
                                ICON_WIDTH : 0))
    #define MARGIN_Y        (global_settings.statusbar ? STATUSBAR_HEIGHT : 0)

    #define LINE_X          0
    #define LINE_Y          (global_settings.statusbar ? 1 : 0)

    #define SCROLLBAR_X     0
    #define SCROLLBAR_Y     lcd_getymargin()
    #define SCROLLBAR_WIDTH 6
#else
    #define MARGIN_X        0
    #define MARGIN_Y        0
    #define LINE_X          2
    #define LINE_Y          0
    #define CURSOR_X        0
    #define CURSOR_Y        0
#endif

/* Maximum number of tracks we can have loaded at one time */
#define MAX_PLAYLIST_ENTRIES 200

/* Default playlist name for saving */
#define DEFAULT_PLAYLIST_NAME "/viewer.m3u"

/* Index of track on display line _pos */
#define INDEX(_pos) (viewer.first_display_index - viewer.first_index + (_pos))

/* Global playlist viewer settings */
struct playlist_viewer_info {
    struct playlist_info* playlist; /* playlist being viewed                */
    char *name_buffer;          /* Buffer used to store track names         */
    int buffer_size;            /* Size of name buffer                      */

    int num_display_lines;      /* Number of lines on lcd                   */
    int line_height;            /* Height (in pixels) of display line       */
    int char_width;             /* Width (in pixels) of a character         */

    int num_tracks;             /* Number of tracks in playlist             */
    int current_playing_track;  /* Index of current playing track           */

    int num_loaded;             /* Number of track entries loaded in viewer */
    int first_index;            /* Index of first loaded track              */
    int last_index;             /* Index of last loaded track               */
    int first_display_index;    /* Index of first track on display          */
    int last_display_index;     /* Index of last track on display           */
    int cursor_pos;             /* Line number of cursor                    */

    int move_track;             /* Playlist index of track to move or -1    */
};

/* Information about a specific track */
struct playlist_entry {
    char *name;                 /* Formatted track name                     */
    int index;                  /* Playlist index                           */
    int display_index;          /* Display index                            */
    bool queued;                /* Is track queued?                         */
};

static struct playlist_viewer_info  viewer;
static struct playlist_entry        tracks[MAX_PLAYLIST_ENTRIES];

/* Used when viewing playlists on disk */
static struct playlist_info         temp_playlist;

#ifdef HAVE_LCD_BITMAP
extern unsigned char bitmap_icons_6x8[LastIcon][6];
#endif

static bool initialize(char* filename, bool reload);
static void load_playlist_entries(int start_index);
static void load_playlist_entries_r(int end_index);
static int  load_entry(int index, int pos, char* p, int size);
static void format_name(char* dest, char* src);
static void format_line(struct playlist_entry* track, char* str, int len);
static void display_playlist(void);
static void update_display_line(int line, bool scroll);
static void scroll_display(int lines);
static void update_first_index(void);
static bool update_playlist(bool force);
#ifdef BUTTON_ON
static int  onplay_menu(int index);
#endif
static bool viewer_menu(void);
static bool show_icons(void);
static bool show_indices(void);
static bool track_display(void);
static bool save_playlist(void);

/* Initialize the playlist viewer. */
static bool initialize(char* filename, bool reload)
{
    char* buffer;
    int buffer_size;
    bool is_playing = mpeg_status() & MPEG_STATUS_PLAY;

    if (!filename && !is_playing)
        /* Nothing is playing, exit */
        return false;

    buffer = plugin_get_buffer(&buffer_size);
    if (!buffer)
        return false;

    if (!filename)
        viewer.playlist = NULL;
    else
    {
        /* Viewing playlist on disk */
        char *dir, *file, *temp_ptr;
        char *index_buffer = NULL;
        int  index_buffer_size = 0;
        
        viewer.playlist = &temp_playlist;

        /* Separate directory from filename */
        temp_ptr = strrchr(filename+1,'/');
        if (temp_ptr)
        {
            *temp_ptr = 0;
            dir = filename;
            file = temp_ptr + 1;
        }
        else
        {
            dir = "/";
            file = filename+1;
        }

        if (is_playing)
        {
            /* Something is playing, use half the plugin buffer for playlist
               indices */
            index_buffer_size = buffer_size / 2;
            index_buffer = buffer;
        }

        playlist_create_ex(viewer.playlist, dir, file, index_buffer,
            index_buffer_size, buffer+index_buffer_size,
            buffer_size-index_buffer_size);

        if (temp_ptr)
            *temp_ptr = '/';

        buffer += index_buffer_size;
        buffer_size -= index_buffer_size;
    }

    viewer.name_buffer = buffer;
    viewer.buffer_size = buffer_size;

#ifdef HAVE_LCD_BITMAP
    {
        char icon_chars[] = "MQ"; /* characters used as icons */
        unsigned int i;

        viewer.char_width = 0;
        viewer.line_height = 0;

        /* Use icon characters to calculate largest possible width/height so
           that we set proper margins */ 
        for (i=0; i<sizeof(icon_chars); i++)
        {
            char str[2];
            int w, h;

            snprintf(str, sizeof(str), "%c", icon_chars[i]);
            lcd_getstringsize(str, &w, &h);

            if (w > viewer.char_width)
                viewer.char_width = w;

            if (h > viewer.line_height)
            {
                viewer.line_height = h;
                viewer.num_display_lines = (LCD_HEIGHT - MARGIN_Y)/h;
            }
        }
    }
#else
    viewer.num_display_lines = 2;
    viewer.char_width = 1;
    viewer.line_height = 1;
#endif

    viewer.move_track = -1;

    if (!reload)
    {
        viewer.cursor_pos = 0;

        if (!viewer.playlist)
            /* Start displaying at current playing track */
            viewer.first_display_index = playlist_get_display_index() - 1;
        else
            viewer.first_display_index = 0;

        update_first_index();
    }

    if (!update_playlist(true))
        return false;

    return true;
}

/* Load tracks starting at start_index */
static void load_playlist_entries(int start_index)
{
    int num_entries = viewer.num_tracks - start_index;
    char* p = viewer.name_buffer;
    int remaining = viewer.buffer_size;
    int i;

    viewer.first_index = start_index;

    if (num_entries > MAX_PLAYLIST_ENTRIES)
        num_entries = MAX_PLAYLIST_ENTRIES;

    for(i=0; i<num_entries; i++, start_index++)
    {
        int len = load_entry(start_index, i, p, remaining);
        if (len < 0)
        {
            /* Out of name buffer space */
            num_entries = i;
            break;
        }

        p += len;
        remaining -= len;
    }

    viewer.num_loaded = num_entries;
    viewer.last_index = viewer.first_index + (viewer.num_loaded - 1);
}

/* Load tracks in reverse, ending at end_index */
static void load_playlist_entries_r(int end_index)
{
    int num_entries = end_index;
    char* p = viewer.name_buffer;
    int remaining = viewer.buffer_size;
    int i;

    viewer.last_index = end_index;

    if (num_entries >= MAX_PLAYLIST_ENTRIES)
        num_entries = MAX_PLAYLIST_ENTRIES-1;

    for(i=num_entries; i>=0; i--, end_index--)
    {
        int len = load_entry(end_index, i, p, remaining);
        if (len < 0)
        {
            int j;

            /* Out of name buffer space */
            num_entries -= i;

            /* Shift loaded tracks up such that first track is index 0 */
            for (j=0; j<num_entries; j++, i++)
            {
                tracks[j].name = tracks[i].name;
                tracks[j].index = tracks[i].index;
                tracks[j].display_index = tracks[i].display_index;
                tracks[j].queued = tracks[i].queued;
            }

            break;
        }

        p += len;
        remaining -= len;
    }

    viewer.first_index = viewer.last_index - num_entries;

    num_entries++;
    if (!viewer.first_index &&
         num_entries < viewer.num_tracks &&
         num_entries < MAX_PLAYLIST_ENTRIES)
    {
        /* Lets see if we can load more data at the end of the list */
        int max = viewer.num_tracks;
        if (max > MAX_PLAYLIST_ENTRIES)
            max = MAX_PLAYLIST_ENTRIES;

        for (i = num_entries; i<max; i++)
        {
            int len = load_entry(num_entries, num_entries, p, remaining);
            if (len < 0)
                /* Out of name buffer space */
                break;
            
            p += len;
            remaining -= len;

            num_entries++;
            viewer.last_index++;
        }
    }

    viewer.num_loaded = num_entries;
}

/* Load track at playlist index.  pos is the position in the tracks array and
   p is a pointer to the name buffer (max size),  Returns -1 if buffer is
   full. */
static int load_entry(int index, int pos, char* p, int size)
{
    struct playlist_track_info info;
    int len;