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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by wavey@wavey.org
*
* 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 <stdio.h>
#include <malloc.h>
#include <time.h>
#include <stdlib.h>
#include <string.h>
#include "playlist.h"
#include <file.h>
#include "sprintf.h"
#include "debug.h"
playlist_info_t playlist;
int index_array[1000];
char now_playing[256];
char* playlist_next(int type)
{
int seek = playlist.indices[playlist.index];
int max;
int fd;
playlist.index = (playlist.index+1) % playlist.amount;
fd = open(playlist.filename, O_RDONLY);
if(-1 != fd) {
lseek(fd, seek, SEEK_SET);
max = read(fd, now_playing, sizeof(now_playing));
close(fd);
seek=0;
while((now_playing[seek] != '\n') &&
(now_playing[seek] != '\r') &&
(seek < max))
seek++;
if(seek == max)
seek = max-1;
now_playing[seek]=0;
return now_playing;
}
else
return NULL;
}
void play_list(char *dir, char *file)
{
empty_playlist(&playlist);
snprintf(playlist.filename, sizeof(playlist.filename),
"%s/%s", dir, file);
/* add track indices to playlist data structure */
add_indices_to_playlist(&playlist);
/* if shuffle is wanted, this is where to do that */
/* also make the first song get playing */
mpeg_play(playlist_next(0));
}
/*
* remove any filename and indices associated with the playlist
*/
void empty_playlist( playlist_info_t *playlist )
{
playlist->filename[0] = '\0';
playlist->index = 0;
playlist->amount = 0;
}
/*
* calculate track offsets within a playlist file
*/
void add_indices_to_playlist( playlist_info_t *playlist )
{
char *p;
int i = 0;
unsigned char byte;
unsigned char lastbyte='\n';
int nread;
int fd;
fd = open(playlist->filename, O_RDONLY);
if(-1 == fd)
return; /* failure */
p = &byte;
/* loop thru buffer, store index whenever we get a new line */
while((nread = read(fd, &byte, 1)) == 1)
{
/* move thru (any) newlines */
if(( byte != '\n' ) && ( byte != '\r' ) &&
((lastbyte == '\n') || (lastbyte == '\r'))) {
/* we're now at the start of a new track filename. store index */
DEBUGF("tune %d at position %d\n", playlist->amount, i);
playlist->indices [ playlist->amount ] = i;
playlist->amount++;
}
i++;
lastbyte = byte;
}
close(fd);
}
static unsigned int playlist_seed = 0xdeadcafe;
void seedit(unsigned int seed)
{
playlist_seed = seed;
}
int getrand(void)
{
playlist_seed += 0x12345;
/* the rand is from 0 to RAND_MAX */
return playlist_seed;
}
/*
* randomly rearrange the array of indices for the playlist
*/
void randomise_playlist( playlist_info_t *playlist, unsigned int seed )
{
int count = 0;
int candidate;
int store;
/* seed with the given seed */
seedit( seed );
/* randomise entire indices list */
while( count < playlist->amount )
{
/* the rand is from 0 to RAND_MAX, so adjust to our value range */
candidate = getrand() % ( playlist->amount );
/* now swap the values at the 'count' and 'candidate' positions */
store = playlist->indices[candidate];
playlist->indices[candidate] = playlist->indices[count];
playlist->indices[count] = store;
/* move along */
count++;
}
}
/* -----------------------------------------------------------------
* local variables:
* eval: (load-file "../firmware/rockbox-mode.el")
* end:
*/
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