181 lines
4.3 KiB
C
181 lines
4.3 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2002 by wavey@wavey.org
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <stdio.h>
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#include <malloc.h>
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#include <time.h>
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#include <stdlib.h>
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#include <string.h>
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#include "playlist.h"
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#include <file.h>
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#include "sprintf.h"
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#include "debug.h"
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playlist_info_t playlist;
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int index_array[1000];
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char now_playing[256];
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char* playlist_next(int type)
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{
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int seek = playlist.indices[playlist.index];
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int max;
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int fd;
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playlist.index = (playlist.index+1) % playlist.amount;
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fd = open(playlist.filename, O_RDONLY);
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if(-1 != fd) {
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lseek(fd, seek, SEEK_SET);
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max = read(fd, now_playing, sizeof(now_playing));
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close(fd);
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seek=0;
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while((now_playing[seek] != '\n') &&
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(now_playing[seek] != '\r') &&
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(seek < max))
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seek++;
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if(seek == max)
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seek = max-1;
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now_playing[seek]=0;
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return now_playing;
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}
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else
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return NULL;
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}
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void play_list(char *dir, char *file)
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{
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empty_playlist(&playlist);
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snprintf(playlist.filename, sizeof(playlist.filename),
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"%s/%s", dir, file);
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/* add track indices to playlist data structure */
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add_indices_to_playlist(&playlist);
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/* if shuffle is wanted, this is where to do that */
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/* also make the first song get playing */
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mpeg_play(playlist_next(0));
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}
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/*
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* remove any filename and indices associated with the playlist
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*/
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void empty_playlist( playlist_info_t *playlist )
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{
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playlist->filename[0] = '\0';
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playlist->index = 0;
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playlist->amount = 0;
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}
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/*
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* calculate track offsets within a playlist file
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*/
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void add_indices_to_playlist( playlist_info_t *playlist )
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{
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char *p;
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int i = 0;
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unsigned char byte;
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unsigned char lastbyte='\n';
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int nread;
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int fd;
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fd = open(playlist->filename, O_RDONLY);
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if(-1 == fd)
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return; /* failure */
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p = &byte;
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/* loop thru buffer, store index whenever we get a new line */
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while((nread = read(fd, &byte, 1)) == 1)
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{
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/* move thru (any) newlines */
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if(( byte != '\n' ) && ( byte != '\r' ) &&
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((lastbyte == '\n') || (lastbyte == '\r'))) {
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/* we're now at the start of a new track filename. store index */
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DEBUGF("tune %d at position %d\n", playlist->amount, i);
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playlist->indices [ playlist->amount ] = i;
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playlist->amount++;
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}
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i++;
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lastbyte = byte;
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}
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close(fd);
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}
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static unsigned int playlist_seed = 0xdeadcafe;
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void seedit(unsigned int seed)
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{
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playlist_seed = seed;
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}
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int getrand(void)
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{
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playlist_seed += 0x12345;
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/* the rand is from 0 to RAND_MAX */
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return playlist_seed;
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}
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/*
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* randomly rearrange the array of indices for the playlist
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*/
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void randomise_playlist( playlist_info_t *playlist, unsigned int seed )
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{
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int count = 0;
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int candidate;
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int store;
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/* seed with the given seed */
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seedit( seed );
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/* randomise entire indices list */
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while( count < playlist->amount )
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{
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/* the rand is from 0 to RAND_MAX, so adjust to our value range */
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candidate = getrand() % ( playlist->amount );
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/* now swap the values at the 'count' and 'candidate' positions */
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store = playlist->indices[candidate];
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playlist->indices[candidate] = playlist->indices[count];
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playlist->indices[count] = store;
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/* move along */
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count++;
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}
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}
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/* -----------------------------------------------------------------
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* local variables:
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* eval: (load-file "../firmware/rockbox-mode.el")
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* end:
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*/
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