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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 <stdlib.h>
#include <string.h>
#include "playlist.h"
#include <file.h>
#include "sprintf.h"
#include "debug.h"
#include "mpeg.h"
#include "lcd.h"
#include "kernel.h"
playlist_info_t playlist;
bool playlist_shuffle = false;
char now_playing[256];
char* playlist_next(int type)
{
int seek = playlist.indices[playlist.index];
int max;
int fd;
int i;
(void)type; /* prevent compiler warning until this is gets used */
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+1, sizeof(now_playing)-1);
close(fd);
/* Zero-terminate the file name */
seek=0;
while((now_playing[seek] != '\n') &&
(now_playing[seek] != '\r') &&
(seek < max))
seek++;
now_playing[seek]=0;
/* replace backslashes with forward slashes */
for ( i=1; i<seek; i++ )
if ( now_playing[i] == '\\' )
now_playing[i] = '/';
if('/' == now_playing[1])
return &now_playing[1];
else {
/* handle dos style drive letter */
if ( ':' == now_playing[2] )
return &now_playing[3];
else {
now_playing[0]='/';
return now_playing;
}
}
}
else
return NULL;
}
void play_list(char *dir, char *file)
{
char *sep="";
lcd_clear_display();
lcd_puts(0,0,"Loading...");
lcd_update();
empty_playlist(&playlist);
/* If the dir does not end in trailing new line, we use a separator.
Otherwise we don't. */
if('/' != dir[strlen(dir)-1])
sep="/";
snprintf(playlist.filename, sizeof(playlist.filename),
"%s%s%s",
dir, sep, file);
/* add track indices to playlist data structure */
add_indices_to_playlist(&playlist);
if(playlist_shuffle) {
lcd_puts(0,0,"Shuffling...");
lcd_update();
randomise_playlist( &playlist, current_tick );
}
lcd_puts(0,0,"Playing... ");
lcd_update();
/* also make the first song get playing */
mpeg_play(playlist_next(0));
sleep(HZ);
}
/*
* 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 )
{
int nread;
int fd;
int i = 0;
int store_index = 0;
int count = 0;
int next_tick = current_tick + HZ;
unsigned char *p;
unsigned char buf[512];
char line[16];
fd = open(playlist->filename, O_RDONLY);
if(-1 == fd)
return; /* failure */
store_index = 1;
while((nread = read(fd, &buf, sizeof(buf))) != 0)
{
p = buf;
for(count=0; count < nread; count++,p++) {
/* Are we on a new line? */
if((*p == '\n') || (*p == '\r'))
{
store_index = 1;
}
else if((*p == '#') && store_index)
{
/* If the first character on a new line is a hash
sign, we treat it as a comment. So called winamp
style playlist. */
store_index = 0;
}
else if(store_index)
{
/* Store a new entry */
playlist->indices[ playlist->amount ] = i+count;
playlist->amount++;
if ( playlist->amount >= MAX_PLAYLIST_SIZE ) {
close(fd);
return;
}
store_index = 0;
if ( current_tick >= next_tick ) {
next_tick = current_tick + HZ;
snprintf(line, sizeof line, "%d files", playlist->amount);
lcd_puts(0,1,line);
lcd_update();
}
}
}
i+= count;
}
snprintf(line, sizeof line, "%d files", playlist->amount);
lcd_puts(0,1,line);
lcd_update();
close(fd);
}
static unsigned int playlist_seed = 0xdeadcafe;
static void seedit(unsigned int seed)
{
playlist_seed = seed;
}
static 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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