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gstreamer/sys/v4l/v4l_calls.c
Ronald S. Bultje 2676b79eb6 Fix device probing from multiple childs. It's done once in the parent class only now, but the childs do get the corre... 
Original commit message from CVS:
Fix device probing from multiple childs. It's done once in the parent class only now, but the childs do get the correct values. Also fixes an incorrect succesful state change if we opened a v4l device that doesn't have the capabilities that are needed by the plugin.
2003-11-09 20:54:24 +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"
#include "gstv4lsrc.h"
#include "gstv4lmjpegsrc.h"
#include "gstv4lmjpegsink.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;
}
/* device type check */
if ((GST_IS_V4LSRC(v4lelement) &&
!(v4lelement->vcap.type & VID_TYPE_CAPTURE)) ||
(GST_IS_V4LMJPEGSRC(v4lelement) &&
!(v4lelement->vcap.type & VID_TYPE_MJPEG_ENCODER)) ||
(GST_IS_V4LMJPEGSINK(v4lelement) &&
!(v4lelement->vcap.type & VID_TYPE_MJPEG_DECODER))) {
gst_element_error(GST_ELEMENT(v4lelement),
"Device opened, but wrong type (0x%x)",
v4lelement->vcap.type);
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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