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Diffstat (limited to 'sys/v4l2/v4l2_calls.c')
-rw-r--r--sys/v4l2/v4l2_calls.c249
1 files changed, 154 insertions, 95 deletions
diff --git a/sys/v4l2/v4l2_calls.c b/sys/v4l2/v4l2_calls.c
index ba93e6e5..1d287d17 100644
--- a/sys/v4l2/v4l2_calls.c
+++ b/sys/v4l2/v4l2_calls.c
@@ -48,23 +48,28 @@ GST_DEBUG_CATEGORY_EXTERN (v4l2_debug);
* get the device's capturing capabilities
* return value: TRUE on success, FALSE on error
******************************************************/
-
gboolean
gst_v4l2_get_capabilities (GstV4l2Object * v4l2object)
{
GST_DEBUG_OBJECT (v4l2object->element, "getting capabilities");
+
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
- if (ioctl (v4l2object->video_fd, VIDIOC_QUERYCAP, &(v4l2object->vcap)) < 0) {
+ if (ioctl (v4l2object->video_fd, VIDIOC_QUERYCAP, &v4l2object->vcap) < 0)
+ goto cap_failed;
+
+ return TRUE;
+
+ /* ERRORS */
+cap_failed:
+ {
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
(_("Error getting capabilities for device '%s':"
" It isn't a v4l2 driver. Check if it is a v4l1 driver"),
v4l2object->videodev), GST_ERROR_SYSTEM);
return FALSE;
}
-
- return TRUE;
}
@@ -73,7 +78,6 @@ gst_v4l2_get_capabilities (GstV4l2Object * v4l2object)
* fill/empty the lists of enumerations
* return value: TRUE on success, FALSE on error
******************************************************/
-
static gboolean
gst_v4l2_fill_lists (GstV4l2Object * v4l2object)
{
@@ -354,7 +358,6 @@ gst_v4l2_empty_lists (GstV4l2Object * v4l2object)
* open the video device (v4l2object->videodev)
* return value: TRUE on success, FALSE on error
******************************************************/
-
gboolean
gst_v4l2_open (GstV4l2Object * v4l2object)
{
@@ -362,6 +365,7 @@ gst_v4l2_open (GstV4l2Object * v4l2object)
GST_DEBUG_OBJECT (v4l2object->element, "Trying to open device %s",
v4l2object->videodev);
+
GST_V4L2_CHECK_NOT_OPEN (v4l2object);
GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
@@ -370,65 +374,80 @@ gst_v4l2_open (GstV4l2Object * v4l2object)
v4l2object->videodev = g_strdup ("/dev/video");
/* check if it is a device */
- if (-1 == stat (v4l2object->videodev, &st)) {
+ if (stat (v4l2object->videodev, &st) == -1)
+ goto stat_failed;
+
+ if (!S_ISCHR (st.st_mode))
+ goto no_device;
+
+ /* open the device */
+ v4l2object->video_fd =
+ open (v4l2object->videodev, O_RDWR /* | O_NONBLOCK */ );
+
+ if (!GST_V4L2_IS_OPEN (v4l2object))
+ goto not_open;
+
+ /* get capabilities, error will be posted */
+ if (!gst_v4l2_get_capabilities (v4l2object))
+ goto error;
+
+ /* do we need to be a capture device? */
+ if (GST_IS_V4L2SRC (v4l2object) &&
+ !(v4l2object->vcap.capabilities & V4L2_CAP_VIDEO_CAPTURE))
+ goto not_capture;
+
+ /* create enumerations, posts errors. */
+ if (!gst_v4l2_fill_lists (v4l2object))
+ goto error;
+
+ GST_INFO_OBJECT (v4l2object->element,
+ "Opened device '%s' (%s) successfully",
+ v4l2object->vcap.card, v4l2object->videodev);
+
+ return TRUE;
+
+ /* ERRORS */
+stat_failed:
+ {
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
(_("Cannot identify device '%s'"), v4l2object->videodev),
GST_ERROR_SYSTEM);
goto error;
}
- if (!S_ISCHR (st.st_mode)) {
+no_device:
+ {
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
(_("This isn't a device '%s'"), v4l2object->videodev),
GST_ERROR_SYSTEM);
goto error;
}
-
- /* open the device */
- v4l2object->video_fd =
- open (v4l2object->videodev, O_RDWR /* | O_NONBLOCK */ );
-
- if (!GST_V4L2_IS_OPEN (v4l2object)) {
+not_open:
+ {
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, OPEN_READ_WRITE,
(_("Could not open device \"%s\" for reading and writing."),
v4l2object->videodev), GST_ERROR_SYSTEM);
goto error;
}
-
- /* get capabilities */
- if (!gst_v4l2_get_capabilities (v4l2object)) {
- goto error;
- }
-
- /* do we need to be a capture device? */
- if (GST_IS_V4L2SRC (v4l2object) &&
- !(v4l2object->vcap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
+not_capture:
+ {
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
(_("Device \"%s\" is not a capture device."),
v4l2object->videodev),
("Capabilities: 0x%x", v4l2object->vcap.capabilities));
goto error;
}
-
- /* create enumerations */
- if (!gst_v4l2_fill_lists (v4l2object))
- goto error;
-
- GST_INFO_OBJECT (v4l2object->element,
- "Opened device '%s' (%s) successfully",
- v4l2object->vcap.card, v4l2object->videodev);
-
- return TRUE;
-
error:
- if (GST_V4L2_IS_OPEN (v4l2object)) {
- /* close device */
- close (v4l2object->video_fd);
- v4l2object->video_fd = -1;
- }
- /* empty lists */
- gst_v4l2_empty_lists (v4l2object);
+ {
+ if (GST_V4L2_IS_OPEN (v4l2object)) {
+ /* close device */
+ close (v4l2object->video_fd);
+ v4l2object->video_fd = -1;
+ }
+ /* empty lists */
+ gst_v4l2_empty_lists (v4l2object);
- return FALSE;
+ return FALSE;
+ }
}
@@ -437,12 +456,12 @@ error:
* close the video device (v4l2object->video_fd)
* return value: TRUE on success, FALSE on error
******************************************************/
-
gboolean
gst_v4l2_close (GstV4l2Object * v4l2object)
{
GST_DEBUG_OBJECT (v4l2object->element, "Trying to close %s",
v4l2object->videodev);
+
GST_V4L2_CHECK_OPEN (v4l2object);
GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
@@ -462,24 +481,27 @@ gst_v4l2_close (GstV4l2Object * v4l2object)
* Get the norm of the current device
* return value: TRUE on success, FALSE on error
******************************************************/
-
gboolean
gst_v4l2_get_norm (GstV4l2Object * v4l2object, v4l2_std_id * norm)
{
GST_DEBUG_OBJECT (v4l2object->element, "getting norm");
+
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
- if (ioctl (v4l2object->video_fd, VIDIOC_G_STD, norm) < 0) {
+ if (ioctl (v4l2object->video_fd, VIDIOC_G_STD, norm) < 0)
+ goto std_failed;
+
+ return TRUE;
+
+ /* ERRORS */
+std_failed:
+ {
GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
(_("Failed to get the current norm for device %s"),
v4l2object->videodev), GST_ERROR_SYSTEM);
return FALSE;
}
-
-
-
- return TRUE;
}
@@ -488,22 +510,27 @@ gst_v4l2_get_norm (GstV4l2Object * v4l2object, v4l2_std_id * norm)
* Set the norm of the current device
* return value: TRUE on success, FALSE on error
******************************************************/
-
gboolean
gst_v4l2_set_norm (GstV4l2Object * v4l2object, v4l2_std_id norm)
{
GST_DEBUG_OBJECT (v4l2object->element, "trying to set norm to %llx", norm);
+
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
- if (ioctl (v4l2object->video_fd, VIDIOC_S_STD, &norm) < 0) {
+ if (ioctl (v4l2object->video_fd, VIDIOC_S_STD, &norm) < 0)
+ goto std_failed;
+
+ return TRUE;
+
+ /* ERRORS */
+std_failed:
+ {
GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
(_("Failed to set norm 0x%llx for device %s: %s"),
norm, v4l2object->videodev), GST_ERROR_SYSTEM);
return FALSE;
}
-
- return TRUE;
}
/******************************************************
@@ -511,7 +538,6 @@ gst_v4l2_set_norm (GstV4l2Object * v4l2object, v4l2_std_id norm)
* get the current frequency
* return value: TRUE on success, FALSE on error
******************************************************/
-
gboolean
gst_v4l2_get_frequency (GstV4l2Object * v4l2object,
gint tunernum, gulong * frequency)
@@ -520,22 +546,28 @@ gst_v4l2_get_frequency (GstV4l2Object * v4l2object,
GstTunerChannel *channel;
GST_DEBUG_OBJECT (v4l2object->element, "getting current tuner frequency");
+
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
channel = gst_tuner_get_channel (GST_TUNER (v4l2object->element));
freq.tuner = tunernum;
- if (ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq) < 0) {
+ if (ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq) < 0)
+ goto freq_failed;
+
+ *frequency = freq.frequency * channel->freq_multiplicator;
+
+ return TRUE;
+
+ /* ERRORS */
+freq_failed:
+ {
GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
(_("Failed to get current tuner frequency for device %s"),
v4l2object->videodev), GST_ERROR_SYSTEM);
return FALSE;
}
-
- *frequency = freq.frequency * channel->freq_multiplicator;
-
- return TRUE;
}
@@ -544,7 +576,6 @@ gst_v4l2_get_frequency (GstV4l2Object * v4l2object,
* set frequency
* return value: TRUE on success, FALSE on error
******************************************************/
-
gboolean
gst_v4l2_set_frequency (GstV4l2Object * v4l2object,
gint tunernum, gulong frequency)
@@ -554,6 +585,7 @@ gst_v4l2_set_frequency (GstV4l2Object * v4l2object,
GST_DEBUG_OBJECT (v4l2object->element,
"setting current tuner frequency to %lu", frequency);
+
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
@@ -564,23 +596,26 @@ gst_v4l2_set_frequency (GstV4l2Object * v4l2object,
ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq);
freq.frequency = frequency / channel->freq_multiplicator;
- if (ioctl (v4l2object->video_fd, VIDIOC_S_FREQUENCY, &freq) < 0) {
+ if (ioctl (v4l2object->video_fd, VIDIOC_S_FREQUENCY, &freq) < 0)
+ goto freq_failed;
+
+ return TRUE;
+
+ /* ERRORS */
+freq_failed:
+ {
GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
(_("Failed to set current tuner frequency for device %s to %lu"),
v4l2object->videodev, frequency), GST_ERROR_SYSTEM);
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 (GstV4l2Object * v4l2object,
gint tunernum, gulong * signal_strength)
@@ -588,53 +623,62 @@ gst_v4l2_signal_strength (GstV4l2Object * v4l2object,
struct v4l2_tuner tuner;
GST_DEBUG_OBJECT (v4l2object->element, "trying to get signal strength");
+
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
tuner.index = tunernum;
- if (ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &tuner) < 0) {
+ if (ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &tuner) < 0)
+ goto tuner_failed;
+
+ *signal_strength = tuner.signal;
+
+ return TRUE;
+
+ /* ERRORS */
+tuner_failed:
+ {
GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
(_("Failed to get signal strength for device %s"),
v4l2object->videodev), GST_ERROR_SYSTEM);
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 (GstV4l2Object * v4l2object,
int attribute_num, int *value)
{
struct v4l2_control control;
- if (!GST_V4L2_IS_OPEN (v4l2object))
- return FALSE;
-
GST_DEBUG_OBJECT (v4l2object->element, "getting value of attribute %d",
attribute_num);
+ if (!GST_V4L2_IS_OPEN (v4l2object))
+ return FALSE;
+
control.id = attribute_num;
- if (ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0) {
+ if (ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
+ goto ctrl_failed;
+
+ *value = control.value;
+
+ return TRUE;
+
+ /* ERRORS */
+ctrl_failed:
+ {
GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
(_("Failed to get value for control %d on device %s"),
attribute_num, v4l2object->videodev), GST_ERROR_SYSTEM);
return FALSE;
}
-
- *value = control.value;
-
- return TRUE;
}
@@ -643,30 +687,33 @@ gst_v4l2_get_attribute (GstV4l2Object * v4l2object,
* try to set the value of one specific attribute
* return value: TRUE on success, FALSE on error
******************************************************/
-
gboolean
gst_v4l2_set_attribute (GstV4l2Object * v4l2object,
int attribute_num, const int value)
{
struct v4l2_control control;
- if (!GST_V4L2_IS_OPEN (v4l2object))
- return FALSE;
-
GST_DEBUG_OBJECT (v4l2object->element, "setting value of attribute %d to %d",
attribute_num, value);
+ if (!GST_V4L2_IS_OPEN (v4l2object))
+ return FALSE;
+
control.id = attribute_num;
control.value = value;
+ if (ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0)
+ goto ctrl_failed;
+
+ return TRUE;
- if (ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0) {
+ /* ERRORS */
+ctrl_failed:
+ {
GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
(_("Failed to set value %d for control %d on device %s"),
value, attribute_num, v4l2object->videodev), GST_ERROR_SYSTEM);
return FALSE;
}
-
- return TRUE;
}
gboolean
@@ -675,36 +722,48 @@ gst_v4l2_get_input (GstV4l2Object * v4l2object, gint * input)
gint n;
GST_DEBUG_OBJECT (v4l2object->element, "trying to get input");
+
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
- if (ioctl (v4l2object->video_fd, VIDIOC_G_INPUT, &n) < 0) {
+ if (ioctl (v4l2object->video_fd, VIDIOC_G_INPUT, &n) < 0)
+ goto input_failed;
+
+ *input = n;
+
+ return TRUE;
+
+ /* ERRORS */
+input_failed:
+ {
GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
(_("Failed to get current input on device %s"),
v4l2object->videodev), GST_ERROR_SYSTEM);
return FALSE;
}
-
- *input = n;
-
- return TRUE;
}
gboolean
gst_v4l2_set_input (GstV4l2Object * v4l2object, gint input)
{
GST_DEBUG_OBJECT (v4l2object->element, "trying to set input to %d", input);
+
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
- if (ioctl (v4l2object->video_fd, VIDIOC_S_INPUT, &input) < 0) {
+ if (ioctl (v4l2object->video_fd, VIDIOC_S_INPUT, &input) < 0)
+ goto input_failed;
+
+ return TRUE;
+
+ /* ERRORS */
+input_failed:
+ {
GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
(_("Failed to set input %d on device %s"),
input, v4l2object->videodev), GST_ERROR_SYSTEM);
return FALSE;
}
-
- return TRUE;
}
generated by cgit v1.2.1 (git 2.18.0) at 2025-02-24 16:44:10 +0000