/* 

   Simple plugin for XMMS to deliver frequency and pcm data in an easy 
   way for any program.

   v2.0 - Uses mmap() + error checks
   
   Written by Jonas Aaberg <cja@gmx.net> 2003.

   Released under GPL.

*/

#include <plugin.h>
#include <gtk/gtk.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <errno.h>
   
static int fd_freq, fd_pcm;
static unsigned char *null_data, *pcm_mem=NULL, *freq_mem=NULL;

static int create_spec(char *name, char **mem)
{
    int fd;

    unlink(name);

    fd = open(name,
	      O_RDWR|O_CREAT|O_TRUNC,
	      S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH);

    if(fd == -1){
	perror("Trying to create:");
	return -1;
    }

    write(fd,null_data,512*2*sizeof(gint16));
    close(fd);

    fd = open(name, O_RDWR|O_NONBLOCK);

    if(fd == -1){
	perror("Trying to open:");
	return -1;
    }

    (*mem) = mmap(0, 512*2*sizeof(gint16), PROT_WRITE,MAP_SHARED, fd, 0);

    if((int)mem == -1){
	close(fd);
	perror("Mmap error:");
	return -1;
    }
    return fd;

}

static void plugin_playback_start(void)
{

    null_data = g_malloc0(512*2*sizeof(gint16));

    fd_freq = create_spec("/tmp/spectrum-freq", (char **)&freq_mem);
    fd_pcm = create_spec("/tmp/spectrum-pcm", (char **)&pcm_mem);

}

static void plugin_playback_stop(void)
{
    //    memcpy(pcm_mem,null_data, 512*2*sizeof(gint16));

    if(fd_freq != -1){
	munmap(freq_mem, 512*2*sizeof(gint16));
	close(fd_freq);
    }

    //    memcpy(freq_mem,null_data, 512*2*sizeof(gint16));

    if(fd_freq != -1){
	munmap(pcm_mem, 512*2*sizeof(gint16));
	close(fd_pcm);
    }

    unlink("/tmp/spectrum-freq");
    unlink("/tmp/spectrum-pcm");

    g_free(null_data);
}

static void plugin_render_freq(gint16 data[2][512])
{
    if(freq_mem !=NULL)
	memcpy(freq_mem, (const void*)data, 512*2*sizeof(gint16));
}

static void plugin_render_pcm(gint16 data[2][512])
{
    if(pcm_mem !=NULL)
        memcpy(pcm_mem, (const void*)data, 512*2*sizeof(gint16));
}

static VisPlugin spectrum_vp =
{
	NULL,
	NULL,
	0,  
	"Freq and PCM outputs for GAI applets v2.0 - http://gai.sf.net -",
	2,				/* One PCM channel */
	2,				/* Two freq channels */
	NULL,				/* init */
        NULL,				/* cleanup */
	NULL,				/* about */
	NULL,				/* configure */
	NULL,				/* disable_plugin */
	plugin_playback_start,	 	/* playback_start */
	plugin_playback_stop, 		/* playback_stop */
	plugin_render_pcm,		/* render_pcm */
	plugin_render_freq  		/* render_freq */
};

VisPlugin *get_vplugin_info(void)
{
	return &spectrum_vp;
}