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gstreamer/sys/v4l/v4l_calls.c
Ronald S. Bultje 0f124a569d Some interface implementations for video4linux/video4linux2 plugins: a Tuner interface, with which one can select inp... 
Original commit message from CVS:
Some interface implementations for video4linux/video4linux2 plugins:
* a Tuner interface, with which one can select inputs and stations. Audio
work is underway here, but unfinished.
* A Xoverlay interface with which one can do simple overlay. Similar to
the API of the v4l/Xv XFree86 extension. Widget implementation for
GTK-2.0 coming up in the sandbox.
* Colorbalance - for adapting colors (brightness, contrast, etc.) - pretty
basic and maybe somewhat overdesigned. But it'll do for now.

Apart from these interfaces, there's also a loadable library 'xwindowlistener'
that listenes to X for the movement of a window and the overlap of other
windows. This is partly copied from xawtv (and thus partly GPL :(), but it's
needed for the xoverlay interface implementation in the v4l/v4l2 elements.

Lastly, some small changes to remove redundant properties from the v4l/v4l2
elements since these can be done much simpler. Comments appreciated!
2003-10-10 12:47:41 +00:00

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/* G-Streamer generic V4L element - generic V4L calls handling
* Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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 Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <gst/gst.h>
#include <gst/tuner/tuner.h>
#include <gst/colorbalance/colorbalance.h>
#include "v4l_calls.h"
#include "gstv4ltuner.h"
#include "gstv4lcolorbalance.h"
#define DEBUG(format, args...) \
GST_DEBUG_OBJECT (\
GST_ELEMENT(v4lelement), \
"V4L: " format, ##args)
static const char *picture_name[] = {
"Hue",
"Brightness",
"Contrast",
"Saturation",
NULL
};
static const char *audio_name[] = {
"Volume",
"Mute",
"Mode",
NULL
};
static const char *norm_name[] = {
"PAL",
"NTSC",
"SECAM",
NULL
};
/******************************************************
* gst_v4l_get_capabilities():
* get the device's capturing capabilities
* return value: TRUE on success, FALSE on error
******************************************************/
static gboolean
gst_v4l_get_capabilities (GstV4lElement *v4lelement)
{
DEBUG("getting capabilities");
GST_V4L_CHECK_OPEN(v4lelement);
if (ioctl(v4lelement->video_fd, VIDIOCGCAP, &(v4lelement->vcap)) < 0)
{
gst_element_error(GST_ELEMENT(v4lelement),
"Error getting \'%s\' capabilities: %s",
v4lelement->videodev, g_strerror(errno));
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4l_open():
* open the video device (v4lelement->videodev)
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_open (GstV4lElement *v4lelement)
{
int num;
DEBUG("opening device %s", v4lelement->videodev);
GST_V4L_CHECK_NOT_OPEN(v4lelement);
GST_V4L_CHECK_NOT_ACTIVE(v4lelement);
/* be sure we have a device */
if (!v4lelement->videodev) {
gst_element_error (GST_ELEMENT (v4lelement),
"No device given - open failed");
return FALSE;
}
/* open the device */
v4lelement->video_fd = open(v4lelement->videodev, O_RDWR);
if (!GST_V4L_IS_OPEN(v4lelement))
{
gst_element_error(GST_ELEMENT(v4lelement),
"Failed to open device (\'%s\'): %s",
v4lelement->videodev, g_strerror(errno));
return FALSE;
}
/* get capabilities */
if (!gst_v4l_get_capabilities(v4lelement))
{
close(v4lelement->video_fd);
v4lelement->video_fd = -1;
return FALSE;
}
gst_info("Opened device \'%s\' (\'%s\') successfully\n",
v4lelement->vcap.name, v4lelement->videodev);
/* norms + inputs, for the tuner interface */
for (num=0;norm_name[num]!=NULL;num++) {
GstV4lTunerNorm *v4lnorm = g_object_new (GST_TYPE_V4L_TUNER_NORM,
NULL);
GstTunerNorm *norm = GST_TUNER_NORM (v4lnorm);
norm->label = g_strdup (norm_name[num]);
norm->fps = (num == 1) ? (30000./1001) : 25.;
v4lnorm->index = num;
v4lelement->norms = g_list_append(v4lelement->norms,
(gpointer) norm);
}
v4lelement->channels = gst_v4l_get_chan_names(v4lelement);
for (num=0;picture_name[num]!=NULL;num++)
{
GstV4lColorBalanceChannel *v4lchannel =
g_object_new (GST_TYPE_V4L_COLOR_BALANCE_CHANNEL, NULL);
GstColorBalanceChannel *channel = GST_COLOR_BALANCE_CHANNEL (v4lchannel);
channel->label = g_strdup (picture_name[num]);
channel->min_value = 0;
channel->max_value = 65535;
v4lchannel->index = num;
v4lelement->colors = g_list_append(v4lelement->colors, channel);
}
DEBUG("Setting default norm/input");
gst_v4l_set_chan_norm (v4lelement, 0, 0);
return TRUE;
}
/******************************************************
* gst_v4l_close():
* close the video device (v4lelement->video_fd)
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_close (GstV4lElement *v4lelement)
{
DEBUG("closing device");
GST_V4L_CHECK_OPEN(v4lelement);
GST_V4L_CHECK_NOT_ACTIVE(v4lelement);
close(v4lelement->video_fd);
v4lelement->video_fd = -1;
g_list_foreach (v4lelement->channels, (GFunc) g_object_unref, NULL);
g_list_free (v4lelement->channels);
v4lelement->channels = NULL;
g_list_foreach (v4lelement->norms, (GFunc) g_object_unref, NULL);
g_list_free (v4lelement->norms);
v4lelement->norms = NULL;
g_list_foreach (v4lelement->colors, (GFunc) g_object_unref, NULL);
g_list_free (v4lelement->colors);
v4lelement->colors = NULL;
return TRUE;
}
/******************************************************
* gst_v4l_get_num_chans()
* return value: the numver of video input channels
******************************************************/
gint
gst_v4l_get_num_chans (GstV4lElement *v4lelement)
{
DEBUG("getting number of channels");
GST_V4L_CHECK_OPEN(v4lelement);
return v4lelement->vcap.channels;
}
/******************************************************
* gst_v4l_get_chan_names()
* return value: a GList containing the channel names
******************************************************/
GList *
gst_v4l_get_chan_names (GstV4lElement *v4lelement)
{
struct video_channel vchan;
const GList *pads = gst_element_get_pad_list (GST_ELEMENT (v4lelement));
GList *list = NULL;
gint i;
DEBUG("getting channel names");
if (!GST_V4L_IS_OPEN(v4lelement))
return NULL;
/* sinks don't have inputs in v4l */
if (pads && g_list_length ((GList *) pads) == 1)
if (GST_PAD_DIRECTION (GST_PAD (pads->data)) == GST_PAD_SINK)
return NULL;
for (i=0;i<gst_v4l_get_num_chans(v4lelement);i++)
{
GstV4lTunerChannel *v4lchannel = g_object_new (GST_TYPE_V4L_TUNER_CHANNEL,
NULL);
GstTunerChannel *channel = GST_TUNER_CHANNEL (v4lchannel);
vchan.channel = i;
if (ioctl(v4lelement->video_fd, VIDIOCGCHAN, &vchan) < 0)
return NULL; /* memleak... */
channel->label = g_strdup (vchan.name);
channel->flags = GST_TUNER_CHANNEL_INPUT;
v4lchannel->index = i;
if (vchan.flags & VIDEO_VC_TUNER) {
struct video_tuner vtun;
gint n;
for (n = 0; ; n++) {
vtun.tuner = n;
if (ioctl(v4lelement->video_fd, VIDIOCGTUNER, &vtun) < 0)
break; /* no more tuners */
if (!strcmp(vtun.name, vchan.name)) {
v4lchannel->tuner = n;
channel->flags |= GST_TUNER_CHANNEL_FREQUENCY;
channel->min_frequency = vtun.rangelow;
channel->max_frequency = vtun.rangehigh;
channel->min_signal = 0;
channel->max_signal = 0xffff;
break;
}
}
}
if (vchan.flags & VIDEO_VC_AUDIO) {
struct video_audio vaud;
gint n;
for (n = 0; n < v4lelement->vcap.audios; n++) {
vaud.audio = n;
if (ioctl(v4lelement->video_fd, VIDIOCGAUDIO, &vaud) < 0)
continue;
if (!strcmp(vaud.name, vchan.name)) {
v4lchannel->audio = n;
channel->flags |= GST_TUNER_CHANNEL_AUDIO;
break;
}
}
}
list = g_list_append(list, (gpointer) channel);
}
return list;
}
/******************************************************
* gst_v4l_get_chan_norm():
* get the currently active video-channel and it's
* norm (VIDEO_MODE_{PAL|NTSC|SECAM|AUTO})
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_get_chan_norm (GstV4lElement *v4lelement,
gint *channel,
gint *norm)
{
DEBUG("getting current channel and norm");
GST_V4L_CHECK_OPEN(v4lelement);
if (channel)
*channel = v4lelement->vchan.channel;
if (norm)
*norm = v4lelement->vchan.norm;
return TRUE;
}
/******************************************************
* gst_v4l_set_chan_norm():
* set a new active channel and it's norm
* (VIDEO_MODE_{PAL|NTSC|SECAM|AUTO})
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_set_chan_norm (GstV4lElement *v4lelement,
gint channel,
gint norm)
{
DEBUG("setting channel = %d, norm = %d (%s)",
channel, norm, norm_name[norm]);
GST_V4L_CHECK_OPEN(v4lelement);
GST_V4L_CHECK_NOT_ACTIVE(v4lelement);
v4lelement->vchan.channel = channel;
v4lelement->vchan.norm = norm;
if (ioctl(v4lelement->video_fd, VIDIOCSCHAN, &(v4lelement->vchan)) < 0)
{
gst_element_error(GST_ELEMENT(v4lelement),
"Error setting the channel/norm settings: %s",
g_strerror(errno));
return FALSE;
}
if (ioctl(v4lelement->video_fd, VIDIOCGCHAN, &(v4lelement->vchan)) < 0)
{
gst_element_error(GST_ELEMENT(v4lelement),
"Error getting the channel/norm settings: %s",
g_strerror(errno));
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4l_get_signal():
* get the current signal
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_get_signal (GstV4lElement *v4lelement,
gint tunernum,
guint *signal)
{
struct video_tuner tuner;
DEBUG("getting tuner signal");
GST_V4L_CHECK_OPEN(v4lelement);
tuner.tuner = tunernum;
if (ioctl(v4lelement->video_fd, VIDIOCGTUNER, &tuner) < 0)
{
gst_element_error(GST_ELEMENT(v4lelement),
"Error getting tuner signal: %s",
sys_errlist[errno]);
return FALSE;
}
*signal = tuner.signal;
return TRUE;
}
/******************************************************
* gst_v4l_get_frequency():
* get the current frequency
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_get_frequency (GstV4lElement *v4lelement,
gint tunernum,
gulong *frequency)
{
struct video_tuner vtun;
DEBUG("getting tuner frequency");
GST_V4L_CHECK_OPEN(v4lelement);
/* check that this is the current input */
vtun.tuner = tunernum;
if (ioctl (v4lelement->video_fd, VIDIOCGTUNER, &vtun) < 0)
return FALSE;
if (strcmp(vtun.name, v4lelement->vchan.name))
return FALSE;
if (ioctl(v4lelement->video_fd, VIDIOCGFREQ, frequency) < 0)
{
gst_element_error(GST_ELEMENT(v4lelement),
"Error getting tuner frequency: %s",
g_strerror(errno));
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4l_set_frequency():
* set frequency
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_set_frequency (GstV4lElement *v4lelement,
gint tunernum,
gulong frequency)
{
struct video_tuner vtun;
DEBUG("setting tuner frequency to %lu", frequency);
GST_V4L_CHECK_OPEN(v4lelement);
/* check that this is the current input */
vtun.tuner = tunernum;
if (ioctl (v4lelement->video_fd, VIDIOCGTUNER, &vtun) < 0)
return FALSE;
if (strcmp(vtun.name, v4lelement->vchan.name))
return FALSE;
if (ioctl(v4lelement->video_fd, VIDIOCSFREQ, &frequency) < 0)
{
gst_element_error(GST_ELEMENT(v4lelement),
"Error setting tuner frequency: %s",
g_strerror(errno));
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4l_get_picture():
* get a picture value
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_get_picture (GstV4lElement *v4lelement,
GstV4lPictureType type,
gint *value)
{
struct video_picture vpic;
DEBUG("getting picture property type %d (%s)",
type, picture_name[type]);
GST_V4L_CHECK_OPEN(v4lelement);
if (ioctl(v4lelement->video_fd, VIDIOCGPICT, &vpic) < 0)
{
gst_element_error(GST_ELEMENT(v4lelement),
"Error getting picture parameters: %s",
g_strerror(errno));
return FALSE;
}
switch (type)
{
case V4L_PICTURE_HUE:
*value = vpic.hue;
break;
case V4L_PICTURE_BRIGHTNESS:
*value = vpic.brightness;
break;
case V4L_PICTURE_CONTRAST:
*value = vpic.contrast;
break;
case V4L_PICTURE_SATURATION:
*value = vpic.colour;
break;
default:
gst_element_error(GST_ELEMENT(v4lelement),
"Error getting picture parameters: unknown type %d",
type);
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4l_set_picture():
* set a picture value
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_set_picture (GstV4lElement *v4lelement,
GstV4lPictureType type,
gint value)
{
struct video_picture vpic;
DEBUG("setting picture type %d (%s) to value %d",
type, picture_name[type], value);
GST_V4L_CHECK_OPEN(v4lelement);
if (ioctl(v4lelement->video_fd, VIDIOCGPICT, &vpic) < 0)
{
gst_element_error(GST_ELEMENT(v4lelement),
"Error getting picture parameters: %s",
g_strerror(errno));
return FALSE;
}
switch (type)
{
case V4L_PICTURE_HUE:
vpic.hue = value;
break;
case V4L_PICTURE_BRIGHTNESS:
vpic.brightness = value;
break;
case V4L_PICTURE_CONTRAST:
vpic.contrast = value;
break;
case V4L_PICTURE_SATURATION:
vpic.colour = value;
break;
default:
gst_element_error(GST_ELEMENT(v4lelement),
"Error setting picture parameters: unknown type %d",
type);
return FALSE;
}
if (ioctl(v4lelement->video_fd, VIDIOCSPICT, &vpic) < 0)
{
gst_element_error(GST_ELEMENT(v4lelement),
"Error setting picture parameters: %s",
g_strerror(errno));
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4l_get_audio():
* get some audio value
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_get_audio (GstV4lElement *v4lelement,
gint audionum,
GstV4lAudioType type,
gint *value)
{
struct video_audio vau;
DEBUG("getting audio parameter type %d (%s)",
type, audio_name[type]);
GST_V4L_CHECK_OPEN(v4lelement);
vau.audio = audionum;
if (ioctl(v4lelement->video_fd, VIDIOCGAUDIO, &vau) < 0)
{
gst_element_error(GST_ELEMENT(v4lelement),
"Error getting audio parameters: %s",
g_strerror(errno));
return FALSE;
}
switch (type)
{
case V4L_AUDIO_MUTE:
*value = (vau.flags & VIDEO_AUDIO_MUTE);
break;
case V4L_AUDIO_VOLUME:
*value = vau.volume;
break;
case V4L_AUDIO_MODE:
*value = vau.mode;
break;
default:
gst_element_error(GST_ELEMENT(v4lelement),
"Error getting audio parameters: unknown type %d",
type);
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4l_set_audio():
* set some audio value
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_set_audio (GstV4lElement *v4lelement,
gint audionum,
GstV4lAudioType type,
gint value)
{
struct video_audio vau;
DEBUG("setting audio parameter type %d (%s) to value %d",
type, audio_name[type], value);
GST_V4L_CHECK_OPEN(v4lelement);
vau.audio = audionum;
if (ioctl(v4lelement->video_fd, VIDIOCGAUDIO, &vau) < 0)
{
gst_element_error(GST_ELEMENT(v4lelement),
"Error getting audio parameters: %s",
g_strerror(errno));
return FALSE;
}
switch (type)
{
case V4L_AUDIO_MUTE:
if (!(vau.flags & VIDEO_AUDIO_MUTABLE))
{
gst_element_error(GST_ELEMENT(v4lelement),
"Error setting audio mute: (un)setting mute is not supported");
return FALSE;
}
if (value)
vau.flags |= VIDEO_AUDIO_MUTE;
else
vau.flags &= ~VIDEO_AUDIO_MUTE;
break;
case V4L_AUDIO_VOLUME:
if (!(vau.flags & VIDEO_AUDIO_VOLUME))
{
gst_element_error(GST_ELEMENT(v4lelement),
"Error setting audio volume: setting volume is not supported");
return FALSE;
}
vau.volume = value;
break;
case V4L_AUDIO_MODE:
vau.mode = value;
break;
default:
gst_element_error(GST_ELEMENT(v4lelement),
"Error setting audio parameters: unknown type %d",
type);
return FALSE;
}
if (ioctl(v4lelement->video_fd, VIDIOCSAUDIO, &vau) < 0)
{
gst_element_error(GST_ELEMENT(v4lelement),
"Error setting audio parameters: %s",
g_strerror(errno));
return FALSE;
}
return TRUE;
}
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