261 lines
6.6 KiB
C
261 lines
6.6 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 "debug.h"
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#include <file.h>
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#include "sprintf.h"
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/*
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* load playlist info from disk
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*/
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int reload_playlist_info( playlist_info_t *playlist )
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{
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DEBUGF( "reload_playlist_info()\n" );
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/* this is a TEMP stub version */
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/* return a dummy playlist entry */
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strncpy( playlist->filename, "test.m3u", sizeof(playlist->filename) );
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playlist->indices_count = 4;
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playlist->indices = (void *)malloc( playlist->indices_count * sizeof( int ) );
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playlist->indices[0] = 3;
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playlist->indices[1] = 2;
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playlist->indices[2] = 1;
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playlist->indices[3] = 9;
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playlist->index = 3;
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return 1;
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}
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/*
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* read the contents of an m3u file from disk and store
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* the indices of each listed track in an array
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*/
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void load_playlist( playlist_info_t *playlist, const char *filename ) {
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DEBUGF( "load_playlist( %s )\n", filename );
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/* store playlist filename */
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strncpy( playlist->filename, filename, sizeof(playlist->filename) );
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/* add track indices to playlist data structure */
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add_indices_to_playlist( playlist );
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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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DEBUGF( "empty_playlist()\n" );
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playlist->filename[0] = '\0';
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playlist->indices_count = 0;
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free( (void *)(playlist->indices) );
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playlist->indices = NULL;
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playlist->index = 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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/*DEBUGF( "add_indices_to_playlist()\n" ); */
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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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extend_indices( playlist, i );
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lastbyte = byte;
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i++;
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}
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close(fd);
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}
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/*
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* extend the array of ints
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*/
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void extend_indices( playlist_info_t *playlist, int new_index )
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{
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/*DEBUGF( "extend_indices(%d)\n", new_index ); */
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/* increase array size count */
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playlist->indices_count++;
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/* increase size of array to new count size */
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playlist->indices = (int *)realloc( playlist->indices, (playlist->indices_count) * sizeof( int ) );
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/* add new element to end of array */
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playlist->indices[ playlist->indices_count - 1 ] = new_index;
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}
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track_t next_playlist_track( playlist_info_t *playlist )
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{
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track_t track;
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strncpy( track.filename, "boogie", sizeof(track.filename) );
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return track;
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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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DEBUGF( "randomise_playlist()\n" );
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/* seed with the given seed */
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srand( seed );
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/* randomise entire indices list */
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while( count < playlist->indices_count )
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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 = rand() % ( playlist->indices_count );
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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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* dump the details of a track to stdout
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*/
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void display_playlist_track( track_t *track )
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{
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DEBUGF( "track: %s\n", track->filename );
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}
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/*
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* dump the current playlist info
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*/
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void display_current_playlist( playlist_info_t *playlist )
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{
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char indices[2048];
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indices[0]='\0';
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/*DEBUGF( "\ndisplay_current_playlist()\n" ); */
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if( playlist->indices_count != 0 )
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{
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get_indices_as_string( indices, playlist );
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}
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DEBUGF( "\nfilename:\t%s\ntotal:\t\t%d\nindices:\t%s\ncurrent index:\t%d\n\n",
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playlist->filename,
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playlist->indices_count,
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indices,
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playlist->index );
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}
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/*
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* produce a string of the playlist indices
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*/
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void get_indices_as_string( char *string, playlist_info_t *playlist )
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{
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char tmp[8];
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int count = 0;
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int *p = playlist->indices;
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/*DEBUGF( "get_indices_as_string()\n" ); */
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while( count < playlist->indices_count ) {
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if( strlen( string ) == 0 )
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{
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/* first iteration - no comma */
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snprintf( tmp, sizeof(tmp), "%d", p[count] );
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}
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else
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{
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/* normal iteration - insert comma */
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snprintf( tmp, sizeof(tmp), ",%d", p[count] );
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}
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strcat( string, tmp );
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count++;
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}
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}
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/*
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Session Start (devlin.openprojects.net:alan): Thu Apr 25 15:13:27 2002
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<alan> for shuffle mode, it's really easy to use the array as a random stack
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<alan> just peek one randomly and exchange it with the last element in the stack
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<alan> when stack is void, just grow the stack with its initial size : elements are still there but in a random order
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<alan> note :
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<alan> a stack is void when all songs were played
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<alan> it is an O(1) algo
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<alan> i don't see how you can do it with a list
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*/
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/* -----------------------------------------------------------------
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* local variables:
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* eval: (load-file "rockbox-mode.el")
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* end:
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*/
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