playlist.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

        playlist->fd = -1;
        playlist->control_fd = -1;

        if (index_buffer)
        {
            int num_indices = index_buffer_size / sizeof(int);

            if (num_indices > global_settings.max_files_in_playlist)
                num_indices = global_settings.max_files_in_playlist;

            playlist->max_playlist_size = num_indices;
            playlist->indices = index_buffer;
        }
        else
        {
            playlist->max_playlist_size = current_playlist.max_playlist_size;
            playlist->indices = current_playlist.indices;
        }

        playlist->buffer_size = 0;
        playlist->buffer = NULL;
        mutex_init(&playlist->control_mutex);
    }

    new_playlist(playlist, dir, file);

    if (file)
        /* load the playlist file */
        add_indices_to_playlist(playlist, temp_buffer, temp_buffer_size);

    return 0;
}

/*
 * Set the specified playlist as the current.
 * NOTE: You will get undefined behaviour if something is already playing so
 *       remember to stop before calling this.  Also, this call will
 *       effectively close your playlist, making it unusable.
 */
int playlist_set_current(struct playlist_info* playlist)
{
    if (!playlist || (check_control(playlist) < 0))
        return -1;

    empty_playlist(&current_playlist, false);

    strncpy(current_playlist.filename, playlist->filename,
        sizeof(current_playlist.filename));

    current_playlist.fd = playlist->fd;

    close(playlist->control_fd);
    remove(current_playlist.control_filename);
    if (rename(playlist->control_filename,
            current_playlist.control_filename) < 0)
        return -1;
    current_playlist.control_fd = open(current_playlist.control_filename,
        O_RDWR);
    if (current_playlist.control_fd < 0)
        return -1;
    current_playlist.control_created = true;

    current_playlist.dirlen = playlist->dirlen;

    if (playlist->indices && playlist->indices != current_playlist.indices)
        memcpy(current_playlist.indices, playlist->indices,
            playlist->max_playlist_size*sizeof(int));

    current_playlist.first_index = playlist->first_index;
    current_playlist.amount = playlist->amount;
    current_playlist.last_insert_pos = playlist->last_insert_pos;
    current_playlist.seed = playlist->seed;
    current_playlist.shuffle_modified = playlist->shuffle_modified;
    current_playlist.deleted = playlist->deleted;
    current_playlist.num_inserted_tracks = playlist->num_inserted_tracks;
    current_playlist.shuffle_flush = playlist->shuffle_flush;
    
    return 0;
}

/*
 * Close files and delete control file for non-current playlist.
 */
void playlist_close(struct playlist_info* playlist)
{
    if (!playlist)
        return;

    if (playlist->fd >= 0)
        close(playlist->fd);

    if (playlist->control_fd >= 0)
        close(playlist->control_fd);

    if (playlist->control_created)
        remove(playlist->control_filename);
}

/*
 * Insert track into playlist at specified position (or one of the special
 * positions).  Returns position where track was inserted or -1 if error.
 */
int playlist_insert_track(struct playlist_info* playlist, char *filename,
                          int position, bool queue)
{
    int result;
    
    if (!playlist)
        playlist = &current_playlist;

    if (check_control(playlist) < 0)
    {
        splash(HZ*2, true, str(LANG_PLAYLIST_CONTROL_ACCESS_ERROR));
        return -1;
    }

    result = add_track_to_playlist(playlist, filename, position, queue, -1);

    if (result != -1)
    {
        fsync(playlist->control_fd);
        mpeg_flush_and_reload_tracks();
    }

    return result;
}

/*
 * Insert all tracks from specified directory into playlist.
 */
int playlist_insert_directory(struct playlist_info* playlist, char *dirname,
                              int position, bool queue, bool recurse)
{
    int count = 0;
    int result;
    char *count_str;

    if (!playlist)
        playlist = &current_playlist;

    if (check_control(playlist) < 0)
    {
        splash(HZ*2, true, str(LANG_PLAYLIST_CONTROL_ACCESS_ERROR));
        return -1;
    }

    if (queue)
        count_str = str(LANG_PLAYLIST_QUEUE_COUNT);
    else
        count_str = str(LANG_PLAYLIST_INSERT_COUNT);

    display_playlist_count(count, count_str);

    result = add_directory_to_playlist(playlist, dirname, &position, queue,
        &count, recurse);
    fsync(playlist->control_fd);

    display_playlist_count(count, count_str);
    mpeg_flush_and_reload_tracks();

    return result;
}

/*
 * Insert all tracks from specified playlist into dynamic playlist.
 */
int playlist_insert_playlist(struct playlist_info* playlist, char *filename,
                             int position, bool queue)
{
    int fd;
    int max;
    char *temp_ptr;
    char *dir;
    char *count_str;
    char temp_buf[MAX_PATH+1];
    char trackname[MAX_PATH+1];
    int count = 0;
    int result = 0;

    if (!playlist)
        playlist = &current_playlist;

    if (check_control(playlist) < 0)
    {
        splash(HZ*2, true, str(LANG_PLAYLIST_CONTROL_ACCESS_ERROR));
        return -1;
    }

    fd = open(filename, O_RDONLY);
    if (fd < 0)
    {
        splash(HZ*2, true, str(LANG_PLAYLIST_ACCESS_ERROR));
        return -1;
    }

    /* we need the directory name for formatting purposes */
    dir = filename;

    temp_ptr = strrchr(filename+1,'/');
    if (temp_ptr)
        *temp_ptr = 0;
    else
        dir = "/";

    if (queue)
        count_str = str(LANG_PLAYLIST_QUEUE_COUNT);
    else
        count_str = str(LANG_PLAYLIST_INSERT_COUNT);

    display_playlist_count(count, count_str);

    while ((max = read_line(fd, temp_buf, sizeof(temp_buf))) > 0)
    {
        /* user abort */
#if defined(HAVE_PLAYER_KEYPAD) || defined(HAVE_NEO_KEYPAD)
        if (button_get(false) == BUTTON_STOP)
#else
        if (button_get(false) == BUTTON_OFF)
#endif
            break;

        if (temp_buf[0] != '#' && temp_buf[0] != '\0')
        {
            int insert_pos;

            /* we need to format so that relative paths are correctly
               handled */
            if (format_track_path(trackname, temp_buf, sizeof(trackname), max,
                    dir) < 0)
            {
                result = -1;
                break;
            }
            
            insert_pos = add_track_to_playlist(playlist, trackname, position,
                queue, -1);

            if (insert_pos < 0)
            {
                result = -1;
                break;
            }

            /* Make sure tracks are inserted in correct order if user
               requests INSERT_FIRST */
            if (position == PLAYLIST_INSERT_FIRST || position >= 0)
                position = insert_pos + 1;

            count++;
            
            if ((count%PLAYLIST_DISPLAY_COUNT) == 0)
            {
                display_playlist_count(count, count_str);

                if (count == PLAYLIST_DISPLAY_COUNT)
                    mpeg_flush_and_reload_tracks();
            }            
        }

        /* let the other threads work */
        yield();
    }

    close(fd);
    fsync(playlist->control_fd);

    if (temp_ptr)
        *temp_ptr = '/';

    display_playlist_count(count, count_str);
    mpeg_flush_and_reload_tracks();

    return result;
}

/* 
 * Delete track at specified index.  If index is PLAYLIST_DELETE_CURRENT then
 * we want to delete the current playing track.
 */
int playlist_delete(struct playlist_info* playlist, int index)
{
    int result = 0;

    if (!playlist)
        playlist = &current_playlist;

    if (check_control(playlist) < 0)
    {
        splash(HZ*2, true, str(LANG_PLAYLIST_CONTROL_ACCESS_ERROR));
        return -1;
    }

    if (index == PLAYLIST_DELETE_CURRENT)
        index = playlist->index;

    result = remove_track_from_playlist(playlist, index, true);
    
    if (result != -1)
        mpeg_flush_and_reload_tracks();

    return result;
}

/*
 * Move track at index to new_index.  Tracks between the two are shifted
 * appropriately.  Returns 0 on success and -1 on failure.
 */
int playlist_move(struct playlist_info* playlist, int index, int new_index)
{
    int result;
    int seek;
    bool control_file;
    bool queue;
    bool current = false;
    int r;
    char filename[MAX_PATH];

    if (!playlist)
        playlist = &current_playlist;

    if (check_control(playlist) < 0)
    {
        splash(HZ*2, true, str(LANG_PLAYLIST_CONTROL_ACCESS_ERROR));
        return -1;
    }

    if (index == new_index)
        return -1;

    if (index == playlist->index)
        /* Moving the current track */
        current = true;

    control_file = playlist->indices[index] & PLAYLIST_INSERT_TYPE_MASK;
    queue = playlist->indices[index] & PLAYLIST_QUEUE_MASK;
    seek = playlist->indices[index] & PLAYLIST_SEEK_MASK;

    if (get_filename(playlist, seek, control_file, filename,
            sizeof(filename)) < 0)
        return -1;

    /* Delete track from original position */
    result = remove_track_from_playlist(playlist, index, true);

    if (result != -1)
    {
        /* We want to insert the track at the position that was specified by
           new_index.  This may be different then new_index because of the
           shifting that occurred after the delete */
        r = rotate_index(playlist, new_index);

        if (r == 0)
            /* First index */
            new_index = PLAYLIST_PREPEND;
        else if (r == playlist->amount)
            /* Append */
            new_index = PLAYLIST_INSERT_LAST;
        else
            /* Calculate index of desired position */
            new_index = (r+playlist->first_index)%playlist->amount;

        result = add_track_to_playlist(playlist, filename, new_index, queue,
            -1);
        
        if (result != -1)
        {
            if (current)
            {
                /* Moved the current track */
                switch (new_index)
                {
                    case PLAYLIST_PREPEND:
                        playlist->index = playlist->first_index;
                        break;
                    case PLAYLIST_INSERT_LAST:
                        playlist->index = playlist->first_index - 1;
                        if (playlist->index < 0)
                            playlist->index += playlist->amount;
                        break;
                    default:
                        playlist->index = new_index;
                        break;
                }
            }

            fsync(playlist->control_fd);
            mpeg_flush_and_reload_tracks();
        }
    }

    return result;
}

/* shuffle currently playing playlist */
int playlist_randomise(struct playlist_info* playlist, unsigned int seed,
                       bool start_current)
{
    int result;

    if (!playlist)
        playlist = &current_playlist;

    check_control(playlist);

    result = randomise_playlist(playlist, seed, start_current, true);

    if (result != -1)
        mpeg_flush_and_reload_tracks();

    return result;
}

/* sort currently playing playlist */
int playlist_sort(struct playlist_info* playlist, bool start_current)
{
    int result;

    if (!playlist)
        playlist = &current_playlist;

    check_control(playlist);

    result = sort_playlist(playlist, start_current, true);

    if (result != -1)
        mpeg_flush_and_reload_tracks();

    return result;
}

/* returns true if playlist has been modified */
bool playlist_modified(struct playlist_info* playlist)
{
    if (!playlist)
        playlist = &current_playlist;

    if (playlist->shuffle_modified ||
        playlist->deleted ||
        playlist->num_inserted_tracks > 0)
        return true;