gstreamer/sys/v4l2/v4l2_calls.c
Ronald S. Bultje 28a38344c6 Proper device-capabilities check when opening
Original commit message from CVS:
Proper device-capabilities check when opening
2003-11-10 10:25:59 +00:00

741 lines
20 KiB
C

/* G-Streamer generic V4L2 element - generic V4L2 calls handling
* Copyright (C) 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 "v4l2_calls.h"
#include "gstv4l2tuner.h"
#include "gstv4l2xoverlay.h"
#include "gstv4l2colorbalance.h"
#include "gstv4l2src.h"
#define DEBUG(format, args...) \
GST_DEBUG_OBJECT (\
GST_ELEMENT(v4l2element), \
"V4L2: " format, ##args)
/******************************************************
* gst_v4l2_get_capabilities():
* get the device's capturing capabilities
* return value: TRUE on success, FALSE on error
******************************************************/
static gboolean
gst_v4l2_get_capabilities (GstV4l2Element *v4l2element)
{
DEBUG("getting capabilities");
GST_V4L2_CHECK_OPEN(v4l2element);
if (ioctl(v4l2element->video_fd, VIDIOC_QUERYCAP, &(v4l2element->vcap)) < 0) {
gst_element_error(GST_ELEMENT(v4l2element),
"Error getting %s capabilities: %s",
v4l2element->device, g_strerror(errno));
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4l2_empty_lists() and gst_v4l2_fill_lists():
* fill/empty the lists of enumerations
* return value: TRUE on success, FALSE on error
******************************************************/
static gboolean
gst_v4l2_fill_lists (GstV4l2Element *v4l2element)
{
gint n;
const GList *pads =
gst_element_get_pad_list (GST_ELEMENT (v4l2element));
GstPadDirection dir = GST_PAD_UNKNOWN;
DEBUG("getting enumerations");
GST_V4L2_CHECK_OPEN(v4l2element);
/* sinks have outputs, all others have inputs */
if (pads && g_list_length ((GList *) pads) == 1)
dir = GST_PAD_DIRECTION (GST_PAD (pads->data));
if (dir != GST_PAD_SINK) {
/* and now, the inputs */
for (n=0;;n++) {
struct v4l2_input input;
GstV4l2TunerChannel *v4l2channel;
GstTunerChannel *channel;
input.index = n;
if (ioctl(v4l2element->video_fd, VIDIOC_ENUMINPUT,
&input) < 0) {
if (errno == EINVAL)
break; /* end of enumeration */
else {
gst_element_error(GST_ELEMENT(v4l2element),
"Failed to get no. %d in input enumeration for %s: %s",
n, v4l2element->device,
g_strerror(errno));
return FALSE;
}
}
v4l2channel =
g_object_new(GST_TYPE_V4L2_TUNER_CHANNEL, NULL);
channel = GST_TUNER_CHANNEL(v4l2channel);
channel->label = g_strdup(input.name);
channel->flags = GST_TUNER_CHANNEL_INPUT;
v4l2channel->index = n;
if (input.type == V4L2_INPUT_TYPE_TUNER) {
struct v4l2_tuner vtun;
v4l2channel->tuner = input.tuner;
channel->flags |= GST_TUNER_CHANNEL_FREQUENCY;
vtun.index = input.tuner;
if (ioctl(v4l2element->video_fd, VIDIOC_G_TUNER,
&vtun) < 0) {
gst_element_error(GST_ELEMENT(v4l2element),
"Failed to get tuner %d settings on %s: %s",
input.tuner,
v4l2element->device,
g_strerror(errno));
g_object_unref(G_OBJECT(channel));
return FALSE;
}
channel->min_frequency = vtun.rangelow;
channel->max_frequency = vtun.rangehigh;
channel->min_signal = 0;
channel->max_signal = 0xffff;
}
if (input.audioset) {
/* we take the first. We don't care for
* the others for now */
while (!(input.audioset &
(1<<v4l2channel->audio)))
v4l2channel->audio++;
channel->flags |= GST_TUNER_CHANNEL_AUDIO;
}
v4l2element->channels =
g_list_append(v4l2element->channels,
(gpointer) channel);
}
} else {
/* outputs */
for (n=0;;n++) {
struct v4l2_output output;
GstV4l2TunerChannel *v4l2channel;
GstTunerChannel *channel;
output.index = n;
if (ioctl(v4l2element->video_fd, VIDIOC_ENUMOUTPUT,
&output) < 0) {
if (errno == EINVAL)
break; /* end of enumeration */
else {
gst_element_error(GST_ELEMENT(v4l2element),
"Failed to get no. %d in output enumeration for %s: %s",
n, v4l2element->device,
g_strerror(errno));
return FALSE;
}
}
v4l2channel = g_object_new(GST_TYPE_V4L2_TUNER_CHANNEL, NULL);
channel = GST_TUNER_CHANNEL(v4l2channel);
channel->label = g_strdup(output.name);
channel->flags = GST_TUNER_CHANNEL_OUTPUT;
v4l2channel->index = n;
if (output.audioset) {
/* we take the first. We don't care for
* the others for now */
while (!(output.audioset &
(1<<v4l2channel->audio)))
v4l2channel->audio++;
channel->flags |= GST_TUNER_CHANNEL_AUDIO;
}
v4l2element->channels =
g_list_append(v4l2element->channels,
(gpointer) channel);
}
}
/* norms... */
for (n=0;;n++) {
struct v4l2_standard standard;
GstV4l2TunerNorm *v4l2norm;
GstTunerNorm *norm;
standard.index = n;
if (ioctl(v4l2element->video_fd, VIDIOC_ENUMSTD, &standard) < 0) {
if (errno == EINVAL)
break; /* end of enumeration */
else {
gst_element_error(GST_ELEMENT(v4l2element),
"Failed to get no. %d in norm enumeration for %s: %s",
n, v4l2element->device, g_strerror(errno));
return FALSE;
}
}
v4l2norm = g_object_new(GST_TYPE_V4L2_TUNER_NORM, NULL);
norm = GST_TUNER_NORM (v4l2norm);
norm->label = g_strdup(standard.name);
norm->fps = (gfloat) standard.frameperiod.denominator /
standard.frameperiod.numerator;
v4l2norm->index = standard.id;
v4l2element->norms = g_list_append(v4l2element->norms,
(gpointer) norm);
}
/* and lastly, controls+menus (if appropriate) */
for (n=V4L2_CID_BASE;;n++) {
struct v4l2_queryctrl control;
GstV4l2ColorBalanceChannel *v4l2channel;
GstColorBalanceChannel *channel;
/* hacky... */
if (n == V4L2_CID_LASTP1)
n = V4L2_CID_PRIVATE_BASE;
control.id = n;
if (ioctl(v4l2element->video_fd, VIDIOC_QUERYCTRL, &control) < 0) {
if (errno == EINVAL) {
if (n < V4L2_CID_PRIVATE_BASE)
continue;
else
break;
} else {
gst_element_error(GST_ELEMENT(v4l2element),
"Failed to get no. %d in control enumeration for %s: %s",
n, v4l2element->device, g_strerror(errno));
return FALSE;
}
}
if (control.flags & V4L2_CTRL_FLAG_DISABLED)
continue;
switch (n) {
case V4L2_CID_BRIGHTNESS:
case V4L2_CID_CONTRAST:
case V4L2_CID_SATURATION:
case V4L2_CID_HUE:
case V4L2_CID_BLACK_LEVEL:
case V4L2_CID_AUTO_WHITE_BALANCE:
case V4L2_CID_DO_WHITE_BALANCE:
case V4L2_CID_RED_BALANCE:
case V4L2_CID_BLUE_BALANCE:
case V4L2_CID_GAMMA:
case V4L2_CID_EXPOSURE:
case V4L2_CID_AUTOGAIN:
case V4L2_CID_GAIN:
/* we only handle these for now */
break;
default:
DEBUG("ControlID %s (%d) unhandled, FIXME",
control.name, n);
control.id++;
break;
}
if (n != control.id)
continue;
v4l2channel = g_object_new(GST_TYPE_V4L2_COLOR_BALANCE_CHANNEL,
NULL);
channel = GST_COLOR_BALANCE_CHANNEL(v4l2channel);
channel->label = g_strdup(control.name);
v4l2channel->index = n;
#if 0
if (control.type == V4L2_CTRL_TYPE_MENU) {
struct v4l2_querymenu menu, *mptr;
int i;
menu.id = n;
for (i=0;;i++) {
menu.index = i;
if (ioctl(v4l2element->video_fd, VIDIOC_QUERYMENU, &menu) < 0) {
if (errno == EINVAL)
break; /* end of enumeration */
else {
gst_element_error(GST_ELEMENT(v4l2element),
"Failed to get no. %d in menu %d enumeration for %s: %s",
i, n, v4l2element->device, g_strerror(errno));
return FALSE;
}
}
mptr = g_malloc(sizeof(menu));
memcpy(mptr, &menu, sizeof(menu));
menus = g_list_append(menus, mptr);
}
}
v4l2element->menus = g_list_append(v4l2element->menus, menus);
#endif
switch (control.type) {
case V4L2_CTRL_TYPE_INTEGER:
channel->min_value = control.minimum;
channel->max_value = control.maximum;
break;
case V4L2_CTRL_TYPE_BOOLEAN:
channel->min_value = FALSE;
channel->max_value = TRUE;
break;
default:
channel->min_value =
channel->max_value = 0;
break;
}
v4l2element->colors = g_list_append(v4l2element->colors,
(gpointer) channel);
}
return TRUE;
}
static void
gst_v4l2_empty_lists (GstV4l2Element *v4l2element)
{
DEBUG("deleting enumerations");
g_list_foreach (v4l2element->channels, (GFunc) g_object_unref, NULL);
g_list_free (v4l2element->channels);
v4l2element->channels = NULL;
g_list_foreach (v4l2element->norms, (GFunc) g_object_unref, NULL);
g_list_free (v4l2element->norms);
v4l2element->norms = NULL;
g_list_foreach (v4l2element->colors, (GFunc) g_object_unref, NULL);
g_list_free (v4l2element->colors);
v4l2element->colors = NULL;
}
/******************************************************
* gst_v4l2_open():
* open the video device (v4l2element->device)
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_open (GstV4l2Element *v4l2element)
{
DEBUG("Trying to open device %s", v4l2element->device);
GST_V4L2_CHECK_NOT_OPEN(v4l2element);
GST_V4L2_CHECK_NOT_ACTIVE(v4l2element);
/* be sure we have a device */
if (!v4l2element->device)
v4l2element->device = g_strdup("/dev/video");
/* open the device */
v4l2element->video_fd = open(v4l2element->device, O_RDWR);
if (!GST_V4L2_IS_OPEN(v4l2element)) {
gst_element_error(GST_ELEMENT(v4l2element),
"Failed to open device %s: %s",
v4l2element->device, g_strerror(errno));
goto error;
}
/* get capabilities */
if (!gst_v4l2_get_capabilities(v4l2element)) {
goto error;
}
/* do we need to be a capture device? */
if (GST_IS_V4L2SRC(v4l2element) &&
!(v4l2element->vcap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
gst_element_error(GST_ELEMENT(v4l2element),
"Not a capture device (0x%x)",
v4l2element->vcap.capabilities);
goto error;
}
/* create enumerations */
if (!gst_v4l2_fill_lists(v4l2element))
goto error;
gst_info("Opened device '%s' (%s) successfully\n",
v4l2element->vcap.card, v4l2element->device);
return TRUE;
error:
if (GST_V4L2_IS_OPEN(v4l2element)) {
/* close device */
close(v4l2element->video_fd);
v4l2element->video_fd = -1;
}
/* empty lists */
gst_v4l2_empty_lists(v4l2element);
return FALSE;
}
/******************************************************
* gst_v4l2_close():
* close the video device (v4l2element->video_fd)
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_close (GstV4l2Element *v4l2element)
{
DEBUG("Trying to close %s", v4l2element->device);
GST_V4L2_CHECK_OPEN(v4l2element);
GST_V4L2_CHECK_NOT_ACTIVE(v4l2element);
/* close device */
close(v4l2element->video_fd);
v4l2element->video_fd = -1;
/* empty lists */
gst_v4l2_empty_lists(v4l2element);
return TRUE;
}
/******************************************************
* gst_v4l2_get_norm()
* Get the norm of the current device
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_get_norm (GstV4l2Element *v4l2element,
v4l2_std_id *norm)
{
DEBUG("getting norm");
GST_V4L2_CHECK_OPEN(v4l2element);
if (ioctl(v4l2element->video_fd, VIDIOC_G_STD, norm) < 0) {
gst_element_error(GST_ELEMENT(v4l2element),
"Failed to get the current norm for device %s: %s",
v4l2element->device, g_strerror(errno));
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4l2_set_norm()
* Set the norm of the current device
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_set_norm (GstV4l2Element *v4l2element,
v4l2_std_id norm)
{
DEBUG("trying to set norm to %llx", norm);
GST_V4L2_CHECK_OPEN(v4l2element);
GST_V4L2_CHECK_NOT_ACTIVE(v4l2element);
if (ioctl(v4l2element->video_fd, VIDIOC_S_STD, &norm) < 0) {
gst_element_error(GST_ELEMENT(v4l2element),
"Failed to set norm 0x%llx for device %s: %s",
norm, v4l2element->device, g_strerror(errno));
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4l2_get_input()
* Get the input of the current device
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_get_input (GstV4l2Element *v4l2element,
gint *input)
{
gint n;
DEBUG("trying to get input");
GST_V4L2_CHECK_OPEN(v4l2element);
if (ioctl(v4l2element->video_fd, VIDIOC_G_INPUT, &n) < 0) {
gst_element_error(GST_ELEMENT(v4l2element),
"Failed to get current input on device %s: %s",
v4l2element->device, g_strerror(errno));
return FALSE;
}
*input = n;
return TRUE;
}
/******************************************************
* gst_v4l2_set_input()
* Set the input of the current device
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_set_input (GstV4l2Element *v4l2element,
gint input)
{
DEBUG("trying to set input to %d", input);
GST_V4L2_CHECK_OPEN(v4l2element);
GST_V4L2_CHECK_NOT_ACTIVE(v4l2element);
if (ioctl(v4l2element->video_fd, VIDIOC_S_INPUT, &input) < 0) {
gst_element_error(GST_ELEMENT(v4l2element),
"Failed to set input %d on device %s: %s",
input, v4l2element->device, g_strerror(errno));
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4l2_get_output()
* Get the output of the current device
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_get_output (GstV4l2Element *v4l2element,
gint *output)
{
gint n;
DEBUG("trying to get output");
GST_V4L2_CHECK_OPEN(v4l2element);
if (ioctl(v4l2element->video_fd, VIDIOC_G_OUTPUT, &n) < 0) {
gst_element_error(GST_ELEMENT(v4l2element),
"Failed to get current output on device %s: %s",
v4l2element->device, g_strerror(errno));
return FALSE;
}
*output = n;
return TRUE;
}
/******************************************************
* gst_v4l2_set_output()
* Set the output of the current device
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_set_output (GstV4l2Element *v4l2element,
gint output)
{
DEBUG("trying to set output to %d", output);
GST_V4L2_CHECK_OPEN(v4l2element);
GST_V4L2_CHECK_NOT_ACTIVE(v4l2element);
if (ioctl(v4l2element->video_fd, VIDIOC_S_OUTPUT, &output) < 0) {
gst_element_error(GST_ELEMENT(v4l2element),
"Failed to set output %d on device %s: %s",
output, v4l2element->device, g_strerror(errno));
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4l2_get_frequency():
* get the current frequency
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_get_frequency (GstV4l2Element *v4l2element,
gint tunernum,
gulong *frequency)
{
struct v4l2_frequency freq;
DEBUG("getting current tuner frequency");
GST_V4L2_CHECK_OPEN(v4l2element);
freq.tuner = tunernum;
if (ioctl(v4l2element->video_fd, VIDIOC_G_FREQUENCY, &freq) < 0) {
gst_element_error(GST_ELEMENT(v4l2element),
"Failed to get current tuner frequency for device %s: %s",
v4l2element->device, g_strerror(errno));
return FALSE;
}
*frequency = freq.frequency;
return TRUE;
}
/******************************************************
* gst_v4l2_set_frequency():
* set frequency
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_set_frequency (GstV4l2Element *v4l2element,
gint tunernum,
gulong frequency)
{
struct v4l2_frequency freq;
DEBUG("setting current tuner frequency to %lu", frequency);
GST_V4L2_CHECK_OPEN(v4l2element);
GST_V4L2_CHECK_NOT_ACTIVE(v4l2element);
freq.tuner = tunernum;
/* fill in type - ignore error */
ioctl(v4l2element->video_fd, VIDIOC_G_FREQUENCY, &freq);
freq.frequency = frequency;
if (ioctl(v4l2element->video_fd, VIDIOC_S_FREQUENCY, &freq) < 0) {
gst_element_error(GST_ELEMENT(v4l2element),
"Failed to set tuner frequency to %lu for device %s: %s",
frequency, v4l2element->device, g_strerror(errno));
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4l2_signal_strength():
* get the strength of the signal on the current input
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_signal_strength (GstV4l2Element *v4l2element,
gint tunernum,
gulong *signal_strength)
{
struct v4l2_tuner tuner;
DEBUG("trying to get signal strength");
GST_V4L2_CHECK_OPEN(v4l2element);
tuner.index = tunernum;
if (ioctl(v4l2element->video_fd, VIDIOC_G_TUNER, &tuner) < 0) {
gst_element_error(GST_ELEMENT(v4l2element),
"Failed to get signal strength for device %s: %s",
v4l2element->device, g_strerror(errno));
return FALSE;
}
*signal_strength = tuner.signal;
return TRUE;
}
/******************************************************
* gst_v4l2_get_attribute():
* try to get the value of one specific attribute
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_get_attribute (GstV4l2Element *v4l2element,
int attribute_num,
int *value)
{
struct v4l2_control control;
GST_V4L2_CHECK_OPEN(v4l2element);
DEBUG("getting value of attribute %d", attribute_num);
control.id = attribute_num;
if (ioctl(v4l2element->video_fd, VIDIOC_G_CTRL, &control) < 0) {
gst_element_error(GST_ELEMENT(v4l2element),
"Failed to get value for control %d on device %s: %s",
attribute_num, v4l2element->device, g_strerror(errno));
return FALSE;
}
*value = control.value;
return TRUE;
}
/******************************************************
* gst_v4l2_set_attribute():
* try to set the value of one specific attribute
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_set_attribute (GstV4l2Element *v4l2element,
int attribute_num,
const int value)
{
struct v4l2_control control;
GST_V4L2_CHECK_OPEN(v4l2element);
DEBUG("setting value of attribute %d to %d", attribute_num, value);
control.id = attribute_num;
control.value = value;
if (ioctl(v4l2element->video_fd, VIDIOC_S_CTRL, &control) < 0) {
gst_element_error(GST_ELEMENT(v4l2element),
"Failed to set value %d for control %d on device %s: %s",
value, attribute_num, v4l2element->device, g_strerror(errno));
return FALSE;
}
return TRUE;
}