/* GStreamer * * Copyright (C) 2002 Ronald Bultje * 2006 Edgard Lima * * v4l2_calls.c - generic V4L2 calls handling * * 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 #endif #include #include #include #include #include #include #include #include #ifdef __sun /* Needed on older Solaris Nevada builds (72 at least) */ #include #include #endif #include "v4l2_calls.h" #include "gstv4l2tuner.h" #if 0 #include "gstv4l2xoverlay.h" #endif #include "gstv4l2colorbalance.h" #include "gstv4l2src.h" #include "gstv4l2sink.h" #include "gst/gst-i18n-plugin.h" /* Those are ioctl calls */ #ifndef V4L2_CID_HCENTER #define V4L2_CID_HCENTER V4L2_CID_HCENTER_DEPRECATED #endif #ifndef V4L2_CID_VCENTER #define V4L2_CID_VCENTER V4L2_CID_VCENTER_DEPRECATED #endif GST_DEBUG_CATEGORY_EXTERN (v4l2_debug); #define GST_CAT_DEFAULT v4l2_debug /****************************************************** * gst_v4l2_get_capabilities(): * get the device's capturing capabilities * return value: TRUE on success, FALSE on error ******************************************************/ gboolean gst_v4l2_get_capabilities (GstV4l2Object * v4l2object) { GstElement *e; e = v4l2object->element; GST_DEBUG_OBJECT (e, "getting capabilities"); if (!GST_V4L2_IS_OPEN (v4l2object)) return FALSE; if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_QUERYCAP, &v4l2object->vcap) < 0) goto cap_failed; GST_LOG_OBJECT (e, "driver: '%s'", v4l2object->vcap.driver); GST_LOG_OBJECT (e, "card: '%s'", v4l2object->vcap.card); GST_LOG_OBJECT (e, "bus_info: '%s'", v4l2object->vcap.bus_info); GST_LOG_OBJECT (e, "version: %08x", v4l2object->vcap.version); GST_LOG_OBJECT (e, "capabilites: %08x", v4l2object->vcap.capabilities); 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; } } /****************************************************** * 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 (GstV4l2Object * v4l2object) { gint n; GstElement *e; e = v4l2object->element; GST_DEBUG_OBJECT (e, "getting enumerations"); GST_V4L2_CHECK_OPEN (v4l2object); GST_DEBUG_OBJECT (e, " channels"); /* and now, the channels */ for (n = 0;; n++) { struct v4l2_input input; GstV4l2TunerChannel *v4l2channel; GstTunerChannel *channel; memset (&input, 0, sizeof (input)); input.index = n; if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_ENUMINPUT, &input) < 0) { if (errno == EINVAL) break; /* end of enumeration */ else { GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS, (_("Failed to query attributes of input %d in device %s"), n, v4l2object->videodev), ("Failed to get %d in input enumeration for %s. (%d - %s)", n, v4l2object->videodev, errno, strerror (errno))); return FALSE; } } GST_LOG_OBJECT (e, " index: %d", input.index); GST_LOG_OBJECT (e, " name: '%s'", input.name); GST_LOG_OBJECT (e, " type: %08x", input.type); GST_LOG_OBJECT (e, " audioset: %08x", input.audioset); GST_LOG_OBJECT (e, " std: %016x", (guint) input.std); GST_LOG_OBJECT (e, " status: %08x", input.status); v4l2channel = g_object_new (GST_TYPE_V4L2_TUNER_CHANNEL, NULL); channel = GST_TUNER_CHANNEL (v4l2channel); channel->label = g_strdup ((const gchar *) 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 (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &vtun) < 0) { GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS, (_("Failed to get setting of tuner %d on device '%s'."), input.tuner, v4l2object->videodev), GST_ERROR_SYSTEM); g_object_unref (G_OBJECT (channel)); return FALSE; } channel->freq_multiplicator = 62.5 * ((vtun.capability & V4L2_TUNER_CAP_LOW) ? 1 : 1000); channel->min_frequency = vtun.rangelow * channel->freq_multiplicator; channel->max_frequency = vtun.rangehigh * channel->freq_multiplicator; 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; } v4l2object->channels = g_list_prepend (v4l2object->channels, (gpointer) channel); } v4l2object->channels = g_list_reverse (v4l2object->channels); GST_DEBUG_OBJECT (e, " norms"); /* norms... */ for (n = 0;; n++) { struct v4l2_standard standard = { 0, }; GstV4l2TunerNorm *v4l2norm; GstTunerNorm *norm; /* fill in defaults */ standard.frameperiod.numerator = 1; standard.frameperiod.denominator = 0; standard.index = n; if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_ENUMSTD, &standard) < 0) { if (errno == EINVAL || errno == ENOTTY) break; /* end of enumeration */ else { GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS, (_("Failed to query norm on device '%s'."), v4l2object->videodev), ("Failed to get attributes for norm %d on devide '%s'. (%d - %s)", n, v4l2object->videodev, errno, strerror (errno))); return FALSE; } } GST_DEBUG_OBJECT (e, " '%s', fps: %d / %d", standard.name, standard.frameperiod.denominator, standard.frameperiod.numerator); v4l2norm = g_object_new (GST_TYPE_V4L2_TUNER_NORM, NULL); norm = GST_TUNER_NORM (v4l2norm); norm->label = g_strdup ((const gchar *) standard.name); gst_value_set_fraction (&norm->framerate, standard.frameperiod.denominator, standard.frameperiod.numerator); v4l2norm->index = standard.id; v4l2object->norms = g_list_prepend (v4l2object->norms, (gpointer) norm); } v4l2object->norms = g_list_reverse (v4l2object->norms); GST_DEBUG_OBJECT (e, " controls+menus"); /* and lastly, controls+menus (if appropriate) */ for (n = V4L2_CID_BASE;; n++) { struct v4l2_queryctrl control = { 0, }; GstV4l2ColorBalanceChannel *v4l2channel; GstColorBalanceChannel *channel; /* when we reached the last official CID, continue with private CIDs */ if (n == V4L2_CID_LASTP1) { GST_DEBUG_OBJECT (e, "checking private CIDs"); n = V4L2_CID_PRIVATE_BASE; } GST_DEBUG_OBJECT (e, "checking control %08x", n); control.id = n; if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_QUERYCTRL, &control) < 0) { if (errno == EINVAL) { if (n < V4L2_CID_PRIVATE_BASE) { GST_DEBUG_OBJECT (e, "skipping control %08x", n); /* continue so that we also check private controls */ continue; } else { GST_DEBUG_OBJECT (e, "controls finished"); break; } } else { GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS, (_("Failed getting controls attributes on device '%s'."), v4l2object->videodev), ("Failed querying control %d on device '%s'. (%d - %s)", n, v4l2object->videodev, errno, strerror (errno))); return FALSE; } } if (control.flags & V4L2_CTRL_FLAG_DISABLED) { GST_DEBUG_OBJECT (e, "skipping disabled control"); 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: #ifdef V4L2_CID_SHARPNESS case V4L2_CID_SHARPNESS: #endif /* we only handle these for now (why?) */ break; case V4L2_CID_HFLIP: case V4L2_CID_VFLIP: case V4L2_CID_HCENTER: case V4L2_CID_VCENTER: #ifdef V4L2_CID_PAN_RESET case V4L2_CID_PAN_RESET: #endif #ifdef V4L2_CID_TILT_RESET case V4L2_CID_TILT_RESET: #endif /* not handled here, handled by VideoOrientation interface */ control.id++; break; case V4L2_CID_AUDIO_VOLUME: case V4L2_CID_AUDIO_BALANCE: case V4L2_CID_AUDIO_BASS: case V4L2_CID_AUDIO_TREBLE: case V4L2_CID_AUDIO_MUTE: case V4L2_CID_AUDIO_LOUDNESS: /* FIXME: We should implement GstMixer interface */ /* fall through */ default: GST_DEBUG_OBJECT (e, "ControlID %s (%x) unhandled, FIXME", control.name, n); control.id++; break; } if (n != control.id) continue; GST_DEBUG_OBJECT (e, "Adding ControlID %s (%x)", control.name, n); v4l2channel = g_object_new (GST_TYPE_V4L2_COLOR_BALANCE_CHANNEL, NULL); channel = GST_COLOR_BALANCE_CHANNEL (v4l2channel); channel->label = g_strdup ((const gchar *) control.name); v4l2channel->id = n; #if 0 /* FIXME: it will be need just when handling private controls *(currently none of base controls are of this type) */ 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 (v4l2_ioctl (v4l2object->video_fd, VIDIOC_QUERYMENU, &menu) < 0) { if (errno == EINVAL) break; /* end of enumeration */ else { GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS, (_("Failed getting controls attributes on device '%s'."), v4l2object->videodev), ("Failed to get %d in menu enumeration for %s. (%d - %s)", n, v4l2object->videodev, errno, strerror (errno))); return FALSE; } } mptr = g_malloc (sizeof (menu)); memcpy (mptr, &menu, sizeof (menu)); menus = g_list_append (menus, mptr); } } v4l2object->menus = g_list_append (v4l2object->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: /* FIXME we should find out how to handle V4L2_CTRL_TYPE_BUTTON. BUTTON controls like V4L2_CID_DO_WHITE_BALANCE can just be set (1) or unset (0), but can't be queried */ GST_DEBUG_OBJECT (e, "Control with non supported type %s (%x), type=%d", control.name, n, control.type); channel->min_value = channel->max_value = 0; break; } v4l2object->colors = g_list_prepend (v4l2object->colors, (gpointer) channel); } v4l2object->colors = g_list_reverse (v4l2object->colors); GST_DEBUG_OBJECT (e, "done"); return TRUE; } static void gst_v4l2_empty_lists (GstV4l2Object * v4l2object) { GST_DEBUG_OBJECT (v4l2object->element, "deleting enumerations"); g_list_foreach (v4l2object->channels, (GFunc) g_object_unref, NULL); g_list_free (v4l2object->channels); v4l2object->channels = NULL; g_list_foreach (v4l2object->norms, (GFunc) g_object_unref, NULL); g_list_free (v4l2object->norms); v4l2object->norms = NULL; g_list_foreach (v4l2object->colors, (GFunc) g_object_unref, NULL); g_list_free (v4l2object->colors); v4l2object->colors = NULL; } /****************************************************** * gst_v4l2_open(): * open the video device (v4l2object->videodev) * return value: TRUE on success, FALSE on error ******************************************************/ gboolean gst_v4l2_open (GstV4l2Object * v4l2object) { struct stat st; int libv4l2_fd; GstPollFD pollfd = GST_POLL_FD_INIT; GST_DEBUG_OBJECT (v4l2object->element, "Trying to open device %s", v4l2object->videodev); GST_V4L2_CHECK_NOT_OPEN (v4l2object); GST_V4L2_CHECK_NOT_ACTIVE (v4l2object); /* be sure we have a device */ if (!v4l2object->videodev) v4l2object->videodev = g_strdup ("/dev/video"); /* check if it is a device */ 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; libv4l2_fd = v4l2_fd_open (v4l2object->video_fd, V4L2_ENABLE_ENUM_FMT_EMULATION); /* Note the v4l2_xxx functions are designed so that if they get passed an unknown fd, the will behave exactly as their regular xxx counterparts, so if v4l2_fd_open fails, we continue as normal (missing the libv4l2 custom cam format to normal formats conversion). Chances are big we will still fail then though, as normally v4l2_fd_open only fails if the device is not a v4l2 device. */ if (libv4l2_fd != -1) v4l2object->video_fd = libv4l2_fd; v4l2object->can_poll_device = TRUE; /* 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->element) && !(v4l2object->vcap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) goto not_capture; if (GST_IS_V4L2SINK (v4l2object->element) && !(v4l2object->vcap.capabilities & V4L2_CAP_VIDEO_OUTPUT)) goto not_output; /* 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); pollfd.fd = v4l2object->video_fd; gst_poll_add_fd (v4l2object->poll, &pollfd); gst_poll_fd_ctl_read (v4l2object->poll, &pollfd, TRUE); return TRUE; /* ERRORS */ stat_failed: { GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND, (_("Cannot identify device '%s'."), v4l2object->videodev), GST_ERROR_SYSTEM); goto error; } no_device: { GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND, (_("This isn't a device '%s'."), v4l2object->videodev), GST_ERROR_SYSTEM); goto error; } 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; } 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; } not_output: { GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND, (_("Device '%s' is not a output device."), v4l2object->videodev), ("Capabilities: 0x%x", v4l2object->vcap.capabilities)); goto error; } error: { if (GST_V4L2_IS_OPEN (v4l2object)) { /* close device */ v4l2_close (v4l2object->video_fd); v4l2object->video_fd = -1; } /* empty lists */ gst_v4l2_empty_lists (v4l2object); return FALSE; } } /****************************************************** * gst_v4l2_close(): * close the video device (v4l2object->video_fd) * return value: TRUE on success, FALSE on error ******************************************************/ gboolean gst_v4l2_close (GstV4l2Object * v4l2object) { GstPollFD pollfd = GST_POLL_FD_INIT; GST_DEBUG_OBJECT (v4l2object->element, "Trying to close %s", v4l2object->videodev); GST_V4L2_CHECK_OPEN (v4l2object); GST_V4L2_CHECK_NOT_ACTIVE (v4l2object); /* close device */ v4l2_close (v4l2object->video_fd); pollfd.fd = v4l2object->video_fd; gst_poll_remove_fd (v4l2object->poll, &pollfd); v4l2object->video_fd = -1; /* empty lists */ gst_v4l2_empty_lists (v4l2object); 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 (GstV4l2Object * v4l2object, v4l2_std_id * norm) { GST_DEBUG_OBJECT (v4l2object->element, "getting norm"); if (!GST_V4L2_IS_OPEN (v4l2object)) return FALSE; if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_STD, norm) < 0) goto std_failed; return TRUE; /* ERRORS */ std_failed: { GST_DEBUG ("Failed to get the current norm for device %s", v4l2object->videodev); return FALSE; } } /****************************************************** * gst_v4l2_set_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 (v4l2_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 for device '%s'."), v4l2object->videodev), GST_ERROR_SYSTEM); return FALSE; } } /****************************************************** * gst_v4l2_get_frequency(): * get the current frequency * return value: TRUE on success, FALSE on error ******************************************************/ gboolean gst_v4l2_get_frequency (GstV4l2Object * v4l2object, gint tunernum, gulong * frequency) { struct v4l2_frequency freq = { 0, }; 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 (v4l2_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; } } /****************************************************** * gst_v4l2_set_frequency(): * set frequency * return value: TRUE on success, FALSE on error ******************************************************/ gboolean gst_v4l2_set_frequency (GstV4l2Object * v4l2object, gint tunernum, gulong frequency) { struct v4l2_frequency freq = { 0, }; GstTunerChannel *channel; GST_DEBUG_OBJECT (v4l2object->element, "setting current tuner frequency to %lu", frequency); if (!GST_V4L2_IS_OPEN (v4l2object)) return FALSE; channel = gst_tuner_get_channel (GST_TUNER (v4l2object->element)); freq.tuner = tunernum; /* fill in type - ignore error */ v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq); freq.frequency = frequency / channel->freq_multiplicator; if (v4l2_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 Hz."), v4l2object->videodev, frequency), GST_ERROR_SYSTEM); return FALSE; } } /****************************************************** * 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) { struct v4l2_tuner tuner = { 0, }; GST_DEBUG_OBJECT (v4l2object->element, "trying to get signal strength"); if (!GST_V4L2_IS_OPEN (v4l2object)) return FALSE; tuner.index = tunernum; if (v4l2_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; } } /****************************************************** * 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 = { 0, }; 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 (v4l2_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; } } /****************************************************** * 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 (GstV4l2Object * v4l2object, int attribute_num, const int value) { struct v4l2_control control = { 0, }; 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 (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0) goto ctrl_failed; return TRUE; /* 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; } } gboolean 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 (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_INPUT, &n) < 0) goto input_failed; *input = n; GST_DEBUG_OBJECT (v4l2object->element, "input: %d", n); return TRUE; /* ERRORS */ input_failed: { GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS, (_("Failed to get current input on device '%s'. May be it is a radio device"), v4l2object->videodev), GST_ERROR_SYSTEM); return FALSE; } } 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 (v4l2_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; } }