Revision as of 16:10, 23 January 2007 by 62.143.24.160 (talk)
blinken_xmms
Das blinken_xmms ist ein Spectrum-Analyser-Plugin für den Multimedia Player XMMS. Es sendet UDP-Pakete an 127.0.0.1:2323 im BLP - Blinkenlights Protokoll mit 8x18 Pixeln. Die Ausgabe kann z.B. mit [lldrv] auf ein Blinken LEDsPro umgeleitet werden.
Quellcode
Den Quellcode für das XMMS-Plugin habe ich mit Hilfe von Workshop: Vis-Plugins in XMMS und XMMS Plugin tutorial at nobugs.org erstellen können. Desweiteren waren Informationen zum BLP - Blinkenlights Protokoll sehr nützlich. Der "Rechen-Kern" für die Visualisierung entspricht dem des spectrum Plugins.
blinken_xmms.c
/* XMMS - Cross-platform multimedia player
* Copyright (C) 1998-2000 Peter Alm, Mikael Alm, Olle Hallnas, Thomas Nilsson and 4Front Technologies
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License forore details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
// --> INSTALL:
//gcc -Wall --shared `xmms-config --cflags` -o blinken_xmms.so blinken_xmms.c
//install blinken_plugin.so `xmms-config --visualization-plugin-dir`
#include <stdio.h>
#include <xmms/plugin.h>
#include <stdio.h>
#include <math.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdlib.h> // für exit()
#include <unistd.h> // für close()
#include <string.h> // fürs memset()
#include <arpa/inet.h> // fürs inet_addr()
#define NUM_BANDS 18
#define WIDTH 18
#define HEIGHT 8
#define MSG {0xDE,0xAD,0xBE,0xEF,0,0,0,0,0x00,0x012,0x00,0x08,\
0,0,0,0,0,0,1,1,1,1,1,1,1,0,0,0,0,0,\
0,0,0,0,1,1,1,1,1,1,1,1,1,1,0,0,0,0,\
0,0,0,1,1,1,0,0,0,0,0,0,1,1,1,0,0,0,\
0,0,1,1,1,0,0,0,0,0,0,0,0,1,1,1,0,0,\
0,0,1,1,1,0,0,0,0,0,0,0,0,1,1,1,0,0,\
0,0,1,1,1,0,0,0,0,0,0,0,0,1,1,1,0,0,\
0,0,0,1,1,0,0,0,0,0,0,0,0,1,1,0,0,0,\
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}
unsigned char msg[156]=MSG;
int sock;
static gint16 bar_heights[NUM_BANDS];
static gdouble scale;
void our_init();
void our_cleanup();
void our_playback_start();
void our_playback_stop();
void our_render_freq( gint16 data[1][256]);
VisPlugin g_our_plugin =
{
NULL, /* handle */
NULL, /* filename */
0, /* session id */
"Blinken-Plugin", /* description */
1, /* PCM Channels */
1, /* Freq. Channels */
/* Callbacks ... */
our_init, /* init */
our_cleanup, /* cleanup */
NULL, /* about-dialog */
NULL, /* configure-dialog */
NULL, /* disable-plugin */
our_playback_start, /* playback-start */
our_playback_stop, /* playback-top */
NULL, /* render-pcm */
our_render_freq /* render-freq */
};
VisPlugin *get_vplugin_info(void)
{
return( & g_our_plugin);
}
#define OUR_PREFIX "blinken-plugin:"
void our_init()
{
if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
{
printf("couldn't create socket");
our_cleanup(); // programm mit fehlercode 1 beenden
exit(1);
}
// Struktur anlegen, mit Nullen initialisieren und füllen
struct sockaddr_in dest_addr;
memset(&dest_addr, 0, sizeof(dest_addr)); // alles mit Nullen füllen
dest_addr.sin_family = AF_INET; // muss hier nochmal stehen
dest_addr.sin_port = htons(2323); // auf dem Port läuft meistens HTTP
dest_addr.sin_addr.s_addr = inet_addr("127.0.0.1"); // IP Adresse von www.example.net
if (connect(sock, (struct sockaddr*) &dest_addr, sizeof(dest_addr)) == -1)
{
printf("couldn't connect to 127.0.0.1:2323");
our_cleanup();
exit(2); // mit fehlercode aussteigen
}
send(sock, msg, 156, 0);
scale = HEIGHT / log(256);
}
void our_cleanup()
{
close(sock); // wir schließen den descriptor wieder
}
void our_playback_start()
{
//printf( OUR_PREFIX" playback_start\n");
}
void our_playback_stop()
{
unsigned char msg[156]=MSG;
send(sock, msg, 156, 0);
}
void our_render_freq( gint16 data[1][256])
{
int result,zeile,spalte;
int i,j,c;
gint y;
gint xscale[NUM_BANDS] = {0, 1, 2, 3, 5, 7, 10, 14, 20, 28, 40, 54, 74, 85, 101, 137, 140, 150};
for(i = 0; i < NUM_BANDS; i++)
{
for(c = xscale[i], y = 0; c < xscale[i + 1]; c++)
{
if(data[0][c] > y)
y = data[0][c];
}
y >>= 7;
if(y != 0)
{
y = (gint)(log(y) * scale);
if(y > HEIGHT)
y = HEIGHT;
}
if(y > bar_heights[i])
bar_heights[i] = y;
else if(bar_heights[i] > 4)
bar_heights[i] -= 4;
else
bar_heights[i] = 0;
}
spalte = 0;
zeile = 0;
for(i=12;i<=155;i++)
{
j = i-12;
c = i-19;
zeile = j/18;
spalte = j%18;
if((-bar_heights[spalte]+8)==8)
{
msg[i]=0x00;
}
else if((-bar_heights[spalte]+7)<=zeile)
{
//msg[i]=0x01;
msg[i]=(unsigned short)(bar_heights[spalte]);
}
else
{
msg[i]=0x00;
}
}
result = send(sock, msg, 156, 0);
return;
}
Installation
gcc -Wall --shared `xmms-config --cflags` -o blinken_xmms.so blinken_xmms.c
install blinken_plugin.so `xmms-config --visualization-plugin-dir`
Evtl. ist das dev. Paket von xmms erforderlich.
Nun kann man mit einem Rechtsklick auf das XMMS-Fenster im Menü: Visualisierung-->Visualisierungs-Plugins
Blinken-Plugin
auswählen. Um den UDP-Stream umzuleiten kann z.B
./BlinkenOutput -l 2323 -d /dev/lldrv
benutzt werden.