/* 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., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301, 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 "gstv4l2object.h" #include "gstv4l2tuner.h" #include "gstv4l2colorbalance.h" #include "gstv4l2src.h" #include "gstv4l2sink.h" #include "gstv4l2videodec.h" #include 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 ******************************************************/ static 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 (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_QUERYCAP, &v4l2object->vcap) < 0) goto cap_failed; if (v4l2object->vcap.capabilities & V4L2_CAP_DEVICE_CAPS) v4l2object->device_caps = v4l2object->vcap.device_caps; else v4l2object->device_caps = v4l2object->vcap.capabilities; 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, "capabilities: %08x", v4l2object->device_caps); 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; } } /****************************************************** * The video4linux command line tool v4l2-ctrl * normalises the names of the controls received from * the kernel like: * * "Exposure (absolute)" -> "exposure_absolute" * * We follow their lead here. @name is modified * in-place. ******************************************************/ static void gst_v4l2_normalise_control_name (gchar * name) { int i, j; for (i = 0, j = 0; name[j]; ++j) { if (g_ascii_isalnum (name[j])) { if (i > 0 && !g_ascii_isalnum (name[j - 1])) name[i++] = '_'; name[i++] = g_ascii_tolower (name[j]); } } name[i++] = '\0'; } /****************************************************** * 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, next; struct v4l2_queryctrl control = { 0, }; 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 (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_ENUMINPUT, &input) < 0) { if (errno == EINVAL || errno == ENOTTY) 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: %016" G_GINT64_MODIFIER "x", (guint64) 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; memset (&vtun, 0, sizeof (vtun)); v4l2channel->tuner = input.tuner; channel->flags |= GST_TUNER_CHANNEL_FREQUENCY; vtun.index = input.tuner; if (v4l2object->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 (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_ENUMSTD, &standard) < 0) { if (errno == EINVAL || errno == ENOTTY) break; /* end of enumeration */ #ifdef ENODATA else if (errno == ENODATA) break; /* end of enumeration, as of Linux 3.7-rc1 */ #endif else { GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS, (_("Failed to query norm on device '%s'."), v4l2object->videodev), ("Failed to get attributes for norm %d on divide '%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; GST_DEBUG_OBJECT (v4l2object->dbg_obj, "index=%08x, label=%s", (unsigned int) v4l2norm->index, norm->label); 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) */ next = V4L2_CTRL_FLAG_NEXT_CTRL; n = 0; control.id = next; while (TRUE) { GstV4l2ColorBalanceChannel *v4l2channel; GstColorBalanceChannel *channel; if (!next) n++; retry: /* 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 | next; if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_QUERYCTRL, &control) < 0) { if (next) { if (n > 0) { GST_DEBUG_OBJECT (e, "controls finished"); break; } else { GST_DEBUG_OBJECT (e, "V4L2_CTRL_FLAG_NEXT_CTRL not supported."); next = 0; n = V4L2_CID_BASE; goto retry; } } if (errno == EINVAL || errno == ENOTTY || errno == EIO || errno == ENOENT) { if (n < V4L2_CID_PRIVATE_BASE) { GST_DEBUG_OBJECT (e, "skipping control %08x", n); /* continue so that we also check private controls */ n = V4L2_CID_PRIVATE_BASE - 1; continue; } else { GST_DEBUG_OBJECT (e, "controls finished"); break; } } else { GST_WARNING_OBJECT (e, "Failed querying control %d on device '%s'. " "(%d - %s)", n, v4l2object->videodev, errno, strerror (errno)); if (n > (V4L2_CID_PRIVATE_BASE + V4L2_CID_MAX_CTRLS)) { GST_DEBUG_OBJECT (e, "Finish control by reaching V4L2_CID_MAX_CTRLS"); break; } continue; } } /* bogus driver might mess with id in unexpected ways (e.g. set to 0), so * make sure to simply try all if V4L2_CTRL_FLAG_NEXT_CTRL not supported */ if (next) n = control.id; if (control.flags & V4L2_CTRL_FLAG_DISABLED) { GST_DEBUG_OBJECT (e, "skipping disabled control"); continue; } if (control.type == V4L2_CTRL_TYPE_CTRL_CLASS) { GST_DEBUG_OBJECT (e, "starting control class '%s'", control.name); continue; } switch (control.type) { case V4L2_CTRL_TYPE_INTEGER: case V4L2_CTRL_TYPE_BOOLEAN: case V4L2_CTRL_TYPE_MENU: case V4L2_CTRL_TYPE_INTEGER_MENU: case V4L2_CTRL_TYPE_BITMASK: case V4L2_CTRL_TYPE_BUTTON: case V4L2_CTRL_TYPE_STRING:{ control.name[31] = '\0'; gst_v4l2_normalise_control_name ((gchar *) control.name); g_datalist_id_set_data (&v4l2object->controls, g_quark_from_string ((const gchar *) control.name), GINT_TO_POINTER (n)); break; } default: GST_DEBUG_OBJECT (e, "Control type for '%s' not supported for extra controls.", control.name); break; } 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: case V4L2_CID_SHARPNESS: /* we only handle these for now (why?) */ break; case V4L2_CID_HFLIP: case V4L2_CID_VFLIP: case V4L2_CID_PAN_RESET: case V4L2_CID_TILT_RESET: /* 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 instead */ /* but let's not be pedantic and make element more useful for now */ break; case V4L2_CID_ALPHA_COMPONENT: v4l2object->has_alpha_component = TRUE; break; 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 (v4l2object->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->dbg_obj, "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; g_datalist_clear (&v4l2object->controls); } static void gst_v4l2_adjust_buf_type (GstV4l2Object * v4l2object) { /* when calling gst_v4l2_object_new the user decides the initial type * so adjust it if multi-planar is supported * the driver should make it exclusive. So the driver should * not support both MPLANE and non-PLANE. * Because even when using MPLANE it still possibles to use it * in a contiguous manner. In this case the first v4l2 plane * contains all the gst planes. */ switch (v4l2object->type) { case V4L2_BUF_TYPE_VIDEO_OUTPUT: if (v4l2object->device_caps & (V4L2_CAP_VIDEO_OUTPUT_MPLANE | V4L2_CAP_VIDEO_M2M_MPLANE)) { GST_DEBUG ("adjust type to multi-planar output"); v4l2object->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE; } break; case V4L2_BUF_TYPE_VIDEO_CAPTURE: if (v4l2object->device_caps & (V4L2_CAP_VIDEO_CAPTURE_MPLANE | V4L2_CAP_VIDEO_M2M_MPLANE)) { GST_DEBUG ("adjust type to multi-planar capture"); v4l2object->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE; } break; default: break; } } /****************************************************** * gst_v4l2_open(): * open the video device (v4l2object->videodev) * return value: TRUE on success, FALSE on error ******************************************************/ gboolean gst_v4l2_open (GstV4l2Object * v4l2object, GstV4l2Error * error) { struct stat st; int libv4l2_fd = -1; GST_DEBUG_OBJECT (v4l2object->dbg_obj, "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; #ifdef HAVE_LIBV4L2 if (v4l2object->fd_open) libv4l2_fd = v4l2object->fd_open (v4l2object->video_fd, V4L2_ENABLE_ENUM_FMT_EMULATION); #endif /* 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; /* 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->device_caps & (V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_CAPTURE_MPLANE))) goto not_capture; if (GST_IS_V4L2SINK (v4l2object->element) && !(v4l2object->device_caps & (V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_VIDEO_OUTPUT_MPLANE))) goto not_output; if (GST_IS_V4L2_VIDEO_DEC (v4l2object->element) && !GST_V4L2_IS_M2M (v4l2object->device_caps)) goto not_m2m; gst_v4l2_adjust_buf_type (v4l2object); /* create enumerations, posts errors. */ if (!gst_v4l2_fill_lists (v4l2object)) goto error; GST_INFO_OBJECT (v4l2object->dbg_obj, "Opened device '%s' (%s) successfully", v4l2object->vcap.card, v4l2object->videodev); if (v4l2object->extra_controls) gst_v4l2_set_controls (v4l2object, v4l2object->extra_controls); /* UVC devices are never interlaced, and doing VIDIOC_TRY_FMT on them * causes expensive and slow USB IO, so don't probe them for interlaced */ if (!strcmp ((char *) v4l2object->vcap.driver, "uvcusb") || !strcmp ((char *) v4l2object->vcap.driver, "uvcvideo")) { v4l2object->never_interlaced = TRUE; } return TRUE; /* ERRORS */ stat_failed: { GST_V4L2_ERROR (error, RESOURCE, NOT_FOUND, (_("Cannot identify device '%s'."), v4l2object->videodev), GST_ERROR_SYSTEM); goto error; } no_device: { GST_V4L2_ERROR (error, RESOURCE, NOT_FOUND, (_("This isn't a device '%s'."), v4l2object->videodev), GST_ERROR_SYSTEM); goto error; } not_open: { GST_V4L2_ERROR (error, RESOURCE, OPEN_READ_WRITE, (_("Could not open device '%s' for reading and writing."), v4l2object->videodev), GST_ERROR_SYSTEM); goto error; } not_capture: { GST_V4L2_ERROR (error, RESOURCE, NOT_FOUND, (_("Device '%s' is not a capture device."), v4l2object->videodev), ("Capabilities: 0x%x", v4l2object->device_caps)); goto error; } not_output: { GST_V4L2_ERROR (error, RESOURCE, NOT_FOUND, (_("Device '%s' is not a output device."), v4l2object->videodev), ("Capabilities: 0x%x", v4l2object->device_caps)); goto error; } not_m2m: { GST_V4L2_ERROR (error, RESOURCE, NOT_FOUND, (_("Device '%s' is not a M2M device."), v4l2object->videodev), ("Capabilities: 0x%x", v4l2object->device_caps)); goto error; } error: { if (GST_V4L2_IS_OPEN (v4l2object)) { /* close device */ v4l2object->close (v4l2object->video_fd); v4l2object->video_fd = -1; } /* empty lists */ gst_v4l2_empty_lists (v4l2object); return FALSE; } } gboolean gst_v4l2_dup (GstV4l2Object * v4l2object, GstV4l2Object * other) { GST_DEBUG_OBJECT (v4l2object->dbg_obj, "Trying to dup device %s", other->videodev); GST_V4L2_CHECK_OPEN (other); GST_V4L2_CHECK_NOT_OPEN (v4l2object); GST_V4L2_CHECK_NOT_ACTIVE (other); GST_V4L2_CHECK_NOT_ACTIVE (v4l2object); v4l2object->vcap = other->vcap; v4l2object->device_caps = other->device_caps; gst_v4l2_adjust_buf_type (v4l2object); v4l2object->video_fd = v4l2object->dup (other->video_fd); if (!GST_V4L2_IS_OPEN (v4l2object)) goto not_open; g_free (v4l2object->videodev); v4l2object->videodev = g_strdup (other->videodev); GST_INFO_OBJECT (v4l2object->dbg_obj, "Cloned device '%s' (%s) successfully", v4l2object->vcap.card, v4l2object->videodev); v4l2object->never_interlaced = other->never_interlaced; v4l2object->no_initial_format = other->no_initial_format; return TRUE; not_open: { GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, OPEN_READ_WRITE, (_("Could not dup device '%s' for reading and writing."), v4l2object->videodev), GST_ERROR_SYSTEM); 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) { GST_DEBUG_OBJECT (v4l2object->dbg_obj, "Trying to close %s", v4l2object->videodev); GST_V4L2_CHECK_OPEN (v4l2object); GST_V4L2_CHECK_NOT_ACTIVE (v4l2object); /* close device */ v4l2object->close (v4l2object->video_fd); 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->dbg_obj, "getting norm"); if (!GST_V4L2_IS_OPEN (v4l2object)) return FALSE; if (v4l2object->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->dbg_obj, "trying to set norm to " "%" G_GINT64_MODIFIER "x", (guint64) norm); if (!GST_V4L2_IS_OPEN (v4l2object)) return FALSE; if (v4l2object->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->dbg_obj, "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 (v4l2object->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->dbg_obj, "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 */ (void) v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq); freq.frequency = frequency / channel->freq_multiplicator; if (v4l2object->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->dbg_obj, "trying to get signal strength"); if (!GST_V4L2_IS_OPEN (v4l2object)) return FALSE; tuner.index = tunernum; if (v4l2object->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->dbg_obj, "getting value of attribute %d", attribute_num); if (!GST_V4L2_IS_OPEN (v4l2object)) return FALSE; control.id = attribute_num; if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0) goto ctrl_failed; *value = control.value; return TRUE; /* ERRORS */ ctrl_failed: { GST_WARNING_OBJECT (v4l2object->dbg_obj, _("Failed to get value for control %d on device '%s'."), attribute_num, v4l2object->videodev); 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->dbg_obj, "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 (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0) goto ctrl_failed; return TRUE; /* ERRORS */ ctrl_failed: { GST_WARNING_OBJECT (v4l2object, _("Failed to set value %d for control %d on device '%s'."), value, attribute_num, v4l2object->videodev); return FALSE; } } /****************************************************** * gst_v4l2_set_string_attribute(): * try to set the string value of one specific attribute * return value: TRUE on success, FALSE on error ******************************************************/ gboolean gst_v4l2_set_string_attribute (GstV4l2Object * v4l2object, int attribute_num, const char *value) { struct v4l2_ext_controls ctrls = { {0}, 1 }; struct v4l2_ext_control ctrl; struct v4l2_queryctrl control = { 0, }; if (!GST_V4L2_IS_OPEN (v4l2object)) return FALSE; control.id = attribute_num; if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_QUERYCTRL, &control) < 0) { GST_WARNING_OBJECT (v4l2object, "Failed to find control %d on device '%s'.", attribute_num, v4l2object->videodev); return TRUE; } if (control.type != V4L2_CTRL_TYPE_STRING) { GST_WARNING_OBJECT (v4l2object, "control %d is not string type on device '%s'.", attribute_num, v4l2object->videodev); return TRUE; } ctrl.id = attribute_num; ctrl.size = strlen (value) + 1; ctrl.string = g_malloc (ctrl.size); strcpy (ctrl.string, value); ctrls.which = V4L2_CTRL_ID2WHICH (attribute_num); ctrls.count = 1; ctrls.controls = &ctrl; GST_DEBUG_OBJECT (v4l2object->dbg_obj, "setting value of attribute %d to %s", attribute_num, value); if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_EXT_CTRLS, &ctrls) < 0) goto ctrl_failed; g_free (ctrl.string); return TRUE; /* ERRORS */ ctrl_failed: { GST_WARNING_OBJECT (v4l2object, _("Failed to set value %s for control %d on device '%s'."), value, attribute_num, v4l2object->videodev); g_free (ctrl.string); return FALSE; } } static gboolean set_control (GQuark field_id, const GValue * value, gpointer user_data) { GstV4l2Object *v4l2object = user_data; GQuark normalised_field_id; gpointer *d; /* 32 bytes is the maximum size for a control name according to v4l2 */ gchar name[32]; /* Backwards compatibility: in the past GStreamer would normalise strings in a subtly different way to v4l2-ctl. e.g. the kernel's "Focus (absolute)" would become "focus__absolute_" whereas now it becomes "focus_absolute". Please remove the following in GStreamer 1.5 for 1.6 */ strncpy (name, g_quark_to_string (field_id), sizeof (name)); name[31] = '\0'; gst_v4l2_normalise_control_name (name); normalised_field_id = g_quark_from_string (name); if (normalised_field_id != field_id) g_warning ("In GStreamer 1.4 the way V4L2 control names were normalised " "changed. Instead of setting \"%s\" please use \"%s\". The former is " "deprecated and will be removed in a future version of GStreamer", g_quark_to_string (field_id), name); field_id = normalised_field_id; d = g_datalist_id_get_data (&v4l2object->controls, field_id); if (!d) { GST_WARNING_OBJECT (v4l2object, "Control '%s' does not exist or has an unsupported type.", g_quark_to_string (field_id)); return TRUE; } if (G_VALUE_HOLDS (value, G_TYPE_INT)) { gst_v4l2_set_attribute (v4l2object, GPOINTER_TO_INT (d), g_value_get_int (value)); } else if (G_VALUE_HOLDS (value, G_TYPE_BOOLEAN)) { gst_v4l2_set_attribute (v4l2object, GPOINTER_TO_INT (d), g_value_get_boolean (value)); } else if (G_VALUE_HOLDS (value, G_TYPE_STRING)) { gst_v4l2_set_string_attribute (v4l2object, GPOINTER_TO_INT (d), g_value_get_string (value)); } else { GST_WARNING_OBJECT (v4l2object, "no compatible value expected for control '%s'.", g_quark_to_string (field_id)); return TRUE; } return TRUE; } gboolean gst_v4l2_set_controls (GstV4l2Object * v4l2object, GstStructure * controls) { return gst_structure_foreach (controls, set_control, v4l2object); } gboolean gst_v4l2_get_input (GstV4l2Object * v4l2object, guint32 * input) { guint32 n; GST_DEBUG_OBJECT (v4l2object->dbg_obj, "trying to get input"); if (!GST_V4L2_IS_OPEN (v4l2object)) return FALSE; if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_INPUT, &n) < 0) goto input_failed; *input = n; GST_DEBUG_OBJECT (v4l2object->dbg_obj, "input: %u", n); return TRUE; /* ERRORS */ input_failed: if (v4l2object->device_caps & V4L2_CAP_TUNER) { /* only give a warning message if driver actually claims to have tuner * support */ 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, guint32 input) { GST_DEBUG_OBJECT (v4l2object->dbg_obj, "trying to set input to %u", input); if (!GST_V4L2_IS_OPEN (v4l2object)) return FALSE; if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_INPUT, &input) < 0) goto input_failed; return TRUE; /* ERRORS */ input_failed: if (v4l2object->device_caps & V4L2_CAP_TUNER) { /* only give a warning message if driver actually claims to have tuner * support */ GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS, (_("Failed to set input %u on device %s."), input, v4l2object->videodev), GST_ERROR_SYSTEM); } return FALSE; } gboolean gst_v4l2_query_input (GstV4l2Object * obj, struct v4l2_input *input) { gint ret; ret = obj->ioctl (obj->video_fd, VIDIOC_ENUMINPUT, input); if (ret < 0) { GST_WARNING_OBJECT (obj->dbg_obj, "Failed to read input state: %s (%i)", g_strerror (errno), errno); return FALSE; } return TRUE; } gboolean gst_v4l2_get_output (GstV4l2Object * v4l2object, guint32 * output) { guint32 n; GST_DEBUG_OBJECT (v4l2object->dbg_obj, "trying to get output"); if (!GST_V4L2_IS_OPEN (v4l2object)) return FALSE; if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_OUTPUT, &n) < 0) goto output_failed; *output = n; GST_DEBUG_OBJECT (v4l2object->dbg_obj, "output: %u", n); return TRUE; /* ERRORS */ output_failed: if (v4l2object->device_caps & V4L2_CAP_TUNER) { /* only give a warning message if driver actually claims to have tuner * support */ GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS, (_("Failed to get current output on device '%s'. May be it is a radio device"), v4l2object->videodev), GST_ERROR_SYSTEM); } return FALSE; } gboolean gst_v4l2_set_output (GstV4l2Object * v4l2object, guint32 output) { GST_DEBUG_OBJECT (v4l2object->dbg_obj, "trying to set output to %u", output); if (!GST_V4L2_IS_OPEN (v4l2object)) return FALSE; if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_OUTPUT, &output) < 0) goto output_failed; return TRUE; /* ERRORS */ output_failed: if (v4l2object->device_caps & V4L2_CAP_TUNER) { /* only give a warning message if driver actually claims to have tuner * support */ GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS, (_("Failed to set output %u on device %s."), output, v4l2object->videodev), GST_ERROR_SYSTEM); } return FALSE; } static const gchar * gst_v4l2_event_to_string (guint32 event) { switch (event) { case V4L2_EVENT_ALL: return "ALL"; case V4L2_EVENT_VSYNC: return "VSYNC"; case V4L2_EVENT_EOS: return "EOS"; case V4L2_EVENT_CTRL: return "CTRL"; case V4L2_EVENT_FRAME_SYNC: return "FRAME_SYNC"; case V4L2_EVENT_SOURCE_CHANGE: return "SOURCE_CHANGE"; case V4L2_EVENT_MOTION_DET: return "MOTION_DET"; default: break; } return "UNKNOWN"; } gboolean gst_v4l2_subscribe_event (GstV4l2Object * v4l2object, guint32 event, guint32 id) { struct v4l2_event_subscription sub = {.type = event,.id = id, }; gint ret; GST_DEBUG_OBJECT (v4l2object->dbg_obj, "Subscribing to '%s' event", gst_v4l2_event_to_string (event)); if (!GST_V4L2_IS_OPEN (v4l2object)) return FALSE; ret = v4l2object->ioctl (v4l2object->video_fd, VIDIOC_SUBSCRIBE_EVENT, &sub); if (ret < 0) goto failed; return TRUE; /* ERRORS */ failed: { if (errno == ENOTTY || errno == EINVAL) { GST_DEBUG_OBJECT (v4l2object->dbg_obj, "Cannot subscribe to '%s' event: %s", gst_v4l2_event_to_string (event), "not supported"); } else { GST_ERROR_OBJECT (v4l2object->dbg_obj, "Cannot subscribe to '%s' event: %s", gst_v4l2_event_to_string (event), g_strerror (errno)); } return FALSE; } } gboolean gst_v4l2_dequeue_event (GstV4l2Object * v4l2object, struct v4l2_event *event) { gint ret; if (!GST_V4L2_IS_OPEN (v4l2object)) return FALSE; ret = v4l2object->ioctl (v4l2object->video_fd, VIDIOC_DQEVENT, event); if (ret < 0) { GST_ERROR_OBJECT (v4l2object->dbg_obj, "DQEVENT failed: %s", g_strerror (errno)); return FALSE; } GST_DEBUG_OBJECT (v4l2object->dbg_obj, "Dequeued a '%s' event.", gst_v4l2_event_to_string (event->type)); return TRUE; } gboolean gst_v4l2_set_dv_timings (GstV4l2Object * v4l2object, struct v4l2_dv_timings *timings) { gint ret; if (!GST_V4L2_IS_OPEN (v4l2object)) return FALSE; ret = v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_DV_TIMINGS, timings); if (ret < 0) { GST_ERROR_OBJECT (v4l2object->dbg_obj, "S_DV_TIMINGS failed: %s (%i)", g_strerror (errno), errno); return FALSE; } return TRUE; } gboolean gst_v4l2_query_dv_timings (GstV4l2Object * v4l2object, struct v4l2_dv_timings *timings) { gint ret; if (!GST_V4L2_IS_OPEN (v4l2object)) return FALSE; ret = v4l2object->ioctl (v4l2object->video_fd, VIDIOC_QUERY_DV_TIMINGS, timings); if (ret < 0) { switch (errno) { case ENODATA: GST_DEBUG_OBJECT (v4l2object->dbg_obj, "QUERY_DV_TIMINGS not supported for this input/output"); break; case ENOLINK: GST_DEBUG_OBJECT (v4l2object->dbg_obj, "No timings could be detected because no signal was found."); break; case ENOLCK: GST_INFO_OBJECT (v4l2object->dbg_obj, "The signal was unstable and the hardware could not lock on to it."); break; case ERANGE: GST_INFO_OBJECT (v4l2object->dbg_obj, "Timings were found, but they are out of range of the hardware capabilities."); break; default: GST_ERROR_OBJECT (v4l2object->dbg_obj, "QUERY_DV_TIMINGS failed: %s (%i)", g_strerror (errno), errno); break; } return FALSE; } if (timings->type != V4L2_DV_BT_656_1120) { GST_FIXME_OBJECT (v4l2object->dbg_obj, "Unsupported DV Timings type (%i)", timings->type); return FALSE; } GST_DEBUG_OBJECT (v4l2object->dbg_obj, "Detected DV Timings (%i x %i)", timings->bt.width, timings->bt.height); return TRUE; }