/*
 *  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 Library General Public License for more 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.
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <math.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <assert.h>

#include <linux/videodev.h>
#include "radio.h"

typedef struct _V4L1RadioDev V4L1RadioDev;
struct _V4L1RadioDev
{
	struct _RadioDev parent;

	int fd;
	int freq_fact;
};

static int
v4l1_radio_init(RadioDev *radio_dev, char *device)
{
	V4L1RadioDev *dev = (V4L1RadioDev*)radio_dev;
	struct video_tuner tuner;
	
	if ((dev->fd = open(device, O_RDONLY)) < 0)
		return 0;
	
	tuner.tuner = 0;
	if (ioctl (dev->fd, VIDIOCGTUNER, &tuner) < 0)
		dev->freq_fact = 16;
	else
	{
		if ((tuner.flags & VIDEO_TUNER_LOW) == 0)
			dev->freq_fact = 16;
		else
			dev->freq_fact = 16000;
	}
	
	return 1;
}

int v4l1_radio_is_init(RadioDev *radio_dev)
{
	V4L1RadioDev *dev = (V4L1RadioDev*)radio_dev;
	return (dev->fd >= 0);
}

static void
v4l1_radio_set_freq(RadioDev *radio_dev, float freq)
{
	V4L1RadioDev *dev = (V4L1RadioDev*)radio_dev;
    int ifreq;

    if (dev->fd<0)
    	return;
    
	ifreq = (freq+1.0/32)*dev->freq_fact;
#if 0
	printf("Setting to %i (= %.2f)\n", ifreq, freq);
#endif

	/* FIXME: Do we need really need these checks? */
	if ((freq > 108) || (freq < 65))
		return;

	assert ((freq <= 108) && (freq > 65));

    if (ioctl(dev->fd, VIDIOCSFREQ, &ifreq) < 0)
		perror ("VIDIOCSFREQ");
}

static void
v4l1_radio_mute(RadioDev *radio_dev, int mute)
{
	V4L1RadioDev *dev = (V4L1RadioDev*)radio_dev;
    struct video_audio vid_aud;

    if (dev->fd<0)
    	return;

    if (ioctl(dev->fd, VIDIOCGAUDIO, &vid_aud)) {
		perror("VIDIOCGAUDIO");
		memset (&vid_aud, 0, sizeof (struct video_audio));
	}
	if (mute) {
    	vid_aud.flags |= VIDEO_AUDIO_MUTE;
	} else {
		vid_aud.volume = 0xFFFF;
		vid_aud.flags &= ~VIDEO_AUDIO_MUTE;
		vid_aud.mode = VIDEO_SOUND_STEREO;
	}
    if (ioctl(dev->fd, VIDIOCSAUDIO, &vid_aud))
		perror("VIDIOCSAUDIO");
}

static int
v4l1_radio_get_stereo(RadioDev *radio_dev)
{
	V4L1RadioDev *dev = (V4L1RadioDev*)radio_dev;
    struct video_audio va;
    va.mode=-1;

    if (dev->fd<0)
    	return -1;
    
    if (ioctl (dev->fd, VIDIOCGAUDIO, &va) < 0)
		return -1;
	if (va.mode == VIDEO_SOUND_STEREO)
		return 1;
	else 
		return 0;
}

static int
v4l1_radio_get_signal(RadioDev *radio_dev)
{
	V4L1RadioDev *dev = (V4L1RadioDev*)radio_dev;
    struct video_tuner vt;
    int signal;

    if (dev->fd<0)
    	return -1;

    memset(&vt,0,sizeof(vt));
    ioctl (dev->fd, VIDIOCGTUNER, &vt);
    signal=vt.signal>>13;

    return signal;
}

static void
v4l1_radio_finalize(RadioDev *radio_dev)
{
	V4L1RadioDev *dev = (V4L1RadioDev*)radio_dev;
	
	if (dev->fd >= 0)
		close(dev->fd);
	free (dev);
}

RadioDev*
v4l1_radio_dev_new (void)
{
    RadioDev *dev;
	V4L1RadioDev *v4l1_dev;

	v4l1_dev = malloc(sizeof(V4L1RadioDev));
	v4l1_dev->fd = -1;
	dev = (RadioDev*)v4l1_dev;

	dev->init       = v4l1_radio_init;
	dev->is_init    = v4l1_radio_is_init;
	dev->set_freq   = v4l1_radio_set_freq;
	dev->mute       = v4l1_radio_mute;
	dev->get_stereo = v4l1_radio_get_stereo;
	dev->get_signal = v4l1_radio_get_signal;
	dev->finalize   = v4l1_radio_finalize;

	return dev;
}