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

                onplay(tracks[index].name, TREE_ATTR_MPA);

                if (!viewer.playlist)
                    ret = 1;
                else
                    ret = 0;

                break;
            }
        }
    }

    menu_exit(m);

    return ret;
}
#endif

/* Menu of viewer options.  Invoked via F1(r) or Menu(p). */
static bool viewer_menu(void)
{
    int m;
    bool result;

    struct menu_items items[] = {
        { str(LANG_SHOW_ICONS),             show_icons },
        { str(LANG_SHOW_INDICES),           show_indices },
        { str(LANG_TRACK_DISPLAY),          track_display },
        { str(LANG_SAVE_DYNAMIC_PLAYLIST),  save_playlist },
    };
    
    m=menu_init( items, sizeof(items) / sizeof(*items) );
    result = menu_run(m);
    menu_exit(m);

    settings_save();

    return result;
}

/* Show icons in viewer? */
static bool show_icons(void)
{
    return set_bool(str(LANG_SHOW_ICONS),
        &global_settings.playlist_viewer_icons);
}

/* Show indices of tracks? */
static bool show_indices(void)
{
    return set_bool(str(LANG_SHOW_INDICES),
        &global_settings.playlist_viewer_indices);
}

/* How to display a track */
static bool track_display(void)
{
    char* names[] = {
        str(LANG_DISPLAY_TRACK_NAME_ONLY),
        str(LANG_DISPLAY_FULL_PATH)
    };
    
    return set_option(str(LANG_TRACK_DISPLAY), 
        &global_settings.playlist_viewer_track_display, INT, names, 2, NULL);
}

/* Save playlist to disk */
static bool save_playlist(void)
{
    char filename[MAX_PATH+1];

    strncpy(filename, DEFAULT_PLAYLIST_NAME, sizeof(filename));

    if (!kbd_input(filename, sizeof(filename)))
    {
        playlist_save(viewer.playlist, filename);
        
        /* reload in case playlist was saved to cwd */
        reload_directory();
    }

    return false;
}

/* View current playlist */
bool playlist_viewer(void)
{
    return playlist_viewer_ex(NULL);
}

/* Main viewer function.  Filename identifies playlist to be viewed.  If NULL,
   view current playlist. */
bool playlist_viewer_ex(char* filename)
{
    bool ret = false;       /* return value */
    bool exit=false;        /* exit viewer */
    bool update=true;       /* update display */
    bool cursor_on=true;    /* used for flashing cursor */
    int old_cursor_pos;     /* last cursor position */
    int button; 

    if (!initialize(filename, false))
        goto exit;

    old_cursor_pos = viewer.cursor_pos;

    while (!exit)
    {
        int track;

        /* Timeout so we can determine if play status has changed */
        button = button_get_w_tmo(HZ/2);

        if (!viewer.playlist && !(mpeg_status() & MPEG_STATUS_PLAY))
        {
            /* Play has stopped */
#ifdef HAVE_LCD_CHARCELLS
            splash(HZ, true, str(LANG_END_PLAYLIST_PLAYER));
#else
            splash(HZ, true, str(LANG_END_PLAYLIST_RECORDER));
#endif
            status_set_playmode(STATUS_STOP);
            goto exit;
        }

        if (viewer.move_track != -1 || !cursor_on)
        {
            /* Flash cursor to identify that we are moving a track */
            cursor_on = !cursor_on;
#ifdef HAVE_LCD_BITMAP
            if (global_settings.invert_cursor)
            {
                lcd_invertrect(
                    MARGIN_X, MARGIN_Y+(viewer.cursor_pos*viewer.line_height),
                    LCD_WIDTH, viewer.line_height);
                lcd_invertscroll(LINE_X, viewer.cursor_pos);
            }
            else
                put_cursorxy(CURSOR_X, CURSOR_Y + viewer.cursor_pos,
                    cursor_on);

            lcd_update_rect(
                0, MARGIN_Y + (viewer.cursor_pos * viewer.line_height),
                LCD_WIDTH, viewer.line_height);
#else
            put_cursorxy(CURSOR_X, CURSOR_Y + viewer.cursor_pos, cursor_on);
            lcd_update();
#endif
        }

        if (!viewer.playlist)
            playlist_get_resume_info(&track);
        else
            track = -1;

        if (track != viewer.current_playing_track ||
            playlist_amount_ex(viewer.playlist) != viewer.num_tracks)
        {
            /* Playlist has changed (new track started?) */
            update_first_index();
            if (!update_playlist(false))
                exit = true;
            else
                update = true;

            /* Abort move on playlist change */
            viewer.move_track = -1;
        }

        switch (button)
        {
#ifdef HAVE_RECORDER_KEYPAD
            case BUTTON_OFF:
            case BUTTON_LEFT:
#else
            case BUTTON_STOP:
#endif
                exit = true;
                break;

#ifdef HAVE_RECORDER_KEYPAD
            case BUTTON_UP:
            case BUTTON_UP | BUTTON_REPEAT:
#else
            case BUTTON_LEFT:
            case BUTTON_LEFT | BUTTON_REPEAT:
#endif
                scroll_display(-1);
                update = true;
                break;

#ifdef HAVE_RECORDER_KEYPAD
            case BUTTON_DOWN:
            case BUTTON_DOWN | BUTTON_REPEAT:
#else
            case BUTTON_RIGHT:
            case BUTTON_RIGHT | BUTTON_REPEAT:
#endif
                scroll_display(1);
                update = true;
                break;

#ifdef BUTTON_ON
#ifdef HAVE_RECORDER_KEYPAD
            case BUTTON_ON | BUTTON_UP:
            case BUTTON_ON | BUTTON_UP | BUTTON_REPEAT:
#else
            case BUTTON_ON | BUTTON_LEFT:
            case BUTTON_ON | BUTTON_LEFT | BUTTON_REPEAT:
#endif
                /* Pageup */
                scroll_display(-viewer.num_display_lines);
                update = true;
                break;

#ifdef HAVE_RECORDER_KEYPAD
            case BUTTON_ON | BUTTON_DOWN:
            case BUTTON_ON | BUTTON_DOWN | BUTTON_REPEAT:
#else
            case BUTTON_ON | BUTTON_RIGHT:
            case BUTTON_ON | BUTTON_RIGHT | BUTTON_REPEAT:
#endif
                /* Pagedown */
                scroll_display(viewer.num_display_lines);
                update = true;
                break;
#endif /* BUTTON_ON */

#ifdef HAVE_RECORDER_KEYPAD
            case BUTTON_RIGHT:
#endif
            case BUTTON_PLAY:
                if (viewer.move_track >= 0)
                {
                    /* Move track */
                    int ret;

                    ret = playlist_move(viewer.playlist, viewer.move_track,
                        tracks[INDEX(viewer.cursor_pos)].index);
                    if (ret < 0)
                        splash(HZ, true, str(LANG_MOVE_FAILED));

                    update_playlist(true);
                    viewer.move_track = -1;
                }
                else if (!viewer.playlist)
                {
                    /* Stop current track and play new track */
                    mpeg_stop();
                    playlist_start(tracks[INDEX(viewer.cursor_pos)].index, 0);
                    status_set_playmode(STATUS_PLAY);
                    update_playlist(false);
                }
                else
                {
                    /* Play track from playlist on disk */
                    mpeg_stop();

                    /* New playlist */
                    if (playlist_set_current(viewer.playlist) < 0)
                        goto exit;

                    playlist_start(tracks[INDEX(viewer.cursor_pos)].index, 0);
                    status_set_playmode(STATUS_PLAY);

                    /* Our playlist is now the current list */
                    if (!initialize(NULL, true))
                        goto exit;
                }

                display_playlist();
                update = true;
                break;

#ifdef BUTTON_ON
            case BUTTON_ON | BUTTON_PLAY:
            {
                /* ON+PLAY menu */
                int ret;

                ret = onplay_menu(INDEX(viewer.cursor_pos));

                if (ret < 0)
                {
                    ret = true;
                    goto exit;
                }
                else if (ret > 0)
                {
                    /* Playlist changed */
                    update_first_index();
                    update_playlist(false);
                    if (viewer.num_tracks <= 0)
                        exit = true;
                }
                else
                    display_playlist();

                update = true;
                break;
            }
#endif /* BUTTON_ON */
#ifdef HAVE_RECORDER_KEYPAD
            case BUTTON_F1:
#else
            case BUTTON_MENU:
#endif
                if (viewer_menu())
                {
                    ret = true;
                    goto exit;
                }
               
                display_playlist();
                update = true;
                break;

            case SYS_USB_CONNECTED:
                usb_screen();
                ret = true;
                goto exit;
                break;

            case BUTTON_NONE:
                status_draw(false);
                break;
        }

        if (update && !exit)
        {
            lcd_stop_scroll();

            if (viewer.cursor_pos >
                (viewer.last_display_index - viewer.first_display_index))
            {
                /* Cursor position is invalid */
                put_cursorxy(CURSOR_X, CURSOR_Y + viewer.cursor_pos, false);
                viewer.cursor_pos =
                    viewer.last_display_index - viewer.first_display_index;
                put_cursorxy(CURSOR_X, CURSOR_Y + viewer.cursor_pos, true);
            }

            if (viewer.cursor_pos != old_cursor_pos &&
                old_cursor_pos <=
                    (viewer.last_display_index - viewer.first_display_index))
                /* Stop scrolling previous line */
                update_display_line(old_cursor_pos, false);

            /* Scroll line at new cursor position */
            update_display_line(viewer.cursor_pos, true);

            lcd_update();

            old_cursor_pos = viewer.cursor_pos;
            cursor_on = true;
            update = false;
        }
    }

exit:
    if (viewer.playlist)
        playlist_close(viewer.playlist);
    return ret;
}