Import media-ctl as 3rd party code

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

2 files changed, 712 insertions, 0 deletions

diff --git a/3rdparty/media-ctl/include/mediactl.h b/3rdparty/media-ctl/include/mediactl.h
new file mode 100644
index 0000000..77ac182
--- /dev/null
+++ b/3rdparty/media-ctl/include/mediactl.h
@@ -0,0 +1,423 @@
+/*
+ * Media controller interface library
+ *
+ * Copyright (C) 2010-2014 Ideas on board SPRL
+ *
+ * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __MEDIA_H__
+#define __MEDIA_H__
+
+#include <linux/media.h>
+
+struct media_link {
+	struct media_pad *source;
+	struct media_pad *sink;
+	struct media_link *twin;
+	__u32 flags;
+	__u32 padding[3];
+};
+
+struct media_pad {
+	struct media_entity *entity;
+	__u32 index;
+	__u32 flags;
+	__u32 padding[3];
+};
+
+struct media_device;
+struct media_entity;
+
+/**
+ * @brief Create a new media device.
+ * @param devnode - device node path.
+ *
+ * Create a media device instance for the given device node and return it. The
+ * device node is not accessed by this function, device node access errors will
+ * not be caught and reported here. The media device needs to be enumerated
+ * before it can be accessed, see media_device_enumerate().
+ *
+ * Media devices are reference-counted, see media_device_ref() and
+ * media_device_unref() for more information.
+ *
+ * @return A pointer to the new media device or NULL if memory cannot be
+ * allocated.
+ */
+struct media_device *media_device_new(const char *devnode);
+
+/**
+ * @brief Create a new emulated media device.
+ * @param info - device information.
+ *
+ * Emulated media devices are userspace-only objects not backed by a kernel
+ * media device. They are created for ALSA and V4L2 devices that are not
+ * associated with a media controller device.
+ *
+ * Only device query functions are available for media devices. Enumerating or
+ * setting up links is invalid.
+ *
+ * @return A pointer to the new media device or NULL if memory cannot be
+ * allocated.
+ */
+struct media_device *media_device_new_emulated(struct media_device_info *info);
+
+/**
+ * @brief Take a reference to the device.
+ * @param media - device instance.
+ *
+ * Media devices are reference-counted. Taking a reference to a device prevents
+ * it from being freed until all references are released. The reference count is
+ * initialized to 1 when the device is created.
+ *
+ * @return A pointer to @a media.
+ */
+struct media_device *media_device_ref(struct media_device *media);
+
+/**
+ * @brief Release a reference to the device.
+ * @param media - device instance.
+ *
+ * Release a reference to the media device. When the reference count reaches 0
+ * this function frees the device.
+ */
+void media_device_unref(struct media_device *media);
+
+/**
+ * @brief Add an entity to an existing media device
+ * @param media - device instance.
+ * @param desc - description of the entity to be added
+ * @param devnode - device node corresponding to the entity
+ *
+ * Entities are usually created and added to media devices automatically when
+ * the media device is enumerated through the media controller API. However,
+ * when an emulated media device (thus not backed with a kernel-side media
+ * controller device) is created, entities need to be manually added.
+ *
+ * Entities can also be manually added to a successfully enumerated media device
+ * to group several functions provided by separate kernel devices. The most
+ * common use case is to group the audio and video functions of a USB webcam in
+ * a single media device. Those functions are exposed through separate USB
+ * interfaces and handled through unrelated kernel drivers, they must thus be
+ * manually added to the same media device.
+ *
+ * This function adds a new entity to the given media device and initializes it
+ * from the given entity description and device node name. Only the following
+ * fields of the description are copied over to the new entity:
+ *
+ * - type
+ * - flags (MEDIA_ENT_FL_DEFAULT only)
+ * - name
+ * - v4l, fb, alsa or dvb (depending on the device type)
+ *
+ * All other fields of the newly created entity id are initialized to 0,
+ * including the entity ID.
+ *
+ * @return Zero on success or -ENOMEM if memory cannot be allocated.
+ */
+int media_device_add_entity(struct media_device *media,
+			    const struct media_entity_desc *desc,
+			    const char *devnode);
+
+/**
+ * @brief Set a handler for debug messages.
+ * @param media - device instance.
+ * @param debug_handler - debug message handler
+ * @param debug_priv - first argument to debug message handler
+ *
+ * Set a handler for debug messages that will be called whenever
+ * debugging information is to be printed. The handler expects an
+ * fprintf-like function.
+ */
+void media_debug_set_handler(
+	struct media_device *media, void (*debug_handler)(void *, ...),
+	void *debug_priv);
+
+/**
+ * @brief Enumerate the device topology
+ * @param media - device instance.
+ *
+ * Enumerate the media device entities, pads and links. Calling this function is
+ * mandatory before accessing the media device contents.
+ *
+ * @return Zero on success or a negative error code on failure.
+ */
+int media_device_enumerate(struct media_device *media);
+
+/**
+ * @brief Locate the pad at the other end of a link.
+ * @param pad - sink pad at one end of the link.
+ *
+ * Locate the source pad connected to @a pad through an enabled link. As only one
+ * link connected to a sink pad can be enabled at a time, the connected source
+ * pad is guaranteed to be unique.
+ *
+ * @return A pointer to the connected source pad, or NULL if all links connected
+ * to @a pad are disabled. Return NULL also if @a pad is not a sink pad.
+ */
+struct media_pad *media_entity_remote_source(struct media_pad *pad);
+
+/**
+ * @brief Get information about a media entity
+ * @param entity - media entity.
+ *
+ * The information structure is owned by the media entity object and will be
+ * freed when the object is destroyed.
+ *
+ * @return A pointer to the media entity information
+ */
+const struct media_entity_desc *media_entity_get_info(struct media_entity *entity);
+
+/**
+ * @brief Get an entity pad
+ * @param entity - media entity.
+ * @param index - pad index.
+ *
+ * This function returns a pointer to the pad object identified by its index
+ * for the given entity. If the pad index is out of bounds it will return NULL.
+ *
+ * @return A pointer to the pad
+ */
+const struct media_pad *media_entity_get_pad(struct media_entity *entity,
+					     unsigned int index);
+
+/**
+ * @brief Get the number of links
+ * @param entity - media entity.
+ *
+ * This function returns the total number of links that originate from or arrive
+ * at the the media entity.
+ *
+ * @return The number of links for the entity
+ */
+unsigned int media_entity_get_links_count(struct media_entity *entity);
+
+/**
+ * @brief Get an entity link
+ * @param entity - media entity.
+ * @param index - link index.
+ *
+ * This function returns a pointer to the link object identified by its index
+ * for the given entity. If the link index is out of bounds it will return NULL.
+ *
+ * @return A pointer to the link
+ */
+const struct media_link *media_entity_get_link(struct media_entity *entity,
+					       unsigned int index);
+
+/**
+ * @brief Get the device node name for an entity
+ * @param entity - media entity.
+ *
+ * This function returns the full path and name to the device node corresponding
+ * to the given entity.
+ *
+ * @return A pointer to the device node name or NULL if the entity has no
+ * associated device node
+ */
+const char *media_entity_get_devname(struct media_entity *entity);
+
+/**
+ * @brief Get the type of an entity.
+ * @param entity - the entity.
+ *
+ * @return The type of @a entity.
+ */
+static inline unsigned int media_entity_type(struct media_entity *entity)
+{
+	return media_entity_get_info(entity)->type & MEDIA_ENT_TYPE_MASK;
+}
+
+/**
+ * @brief Find an entity by its name.
+ * @param media - media device.
+ * @param name - entity name.
+ * @param length - size of @a name.
+ *
+ * Search for an entity with a name equal to @a name.
+ *
+ * @return A pointer to the entity if found, or NULL otherwise.
+ */
+struct media_entity *media_get_entity_by_name(struct media_device *media,
+	const char *name, size_t length);
+
+/**
+ * @brief Find an entity by its ID.
+ * @param media - media device.
+ * @param id - entity ID.
+ *
+ * This function searches for an entity based on its ID using an exact match or
+ * next ID method based on the given @a id. If @a id is ORed with
+ * MEDIA_ENT_ID_FLAG_NEXT, the function will return the entity with the smallest
+ * ID larger than @a id. Otherwise it will return the entity with an ID equal to
+ * @a id.
+ *
+ * @return A pointer to the entity if found, or NULL otherwise.
+ */
+struct media_entity *media_get_entity_by_id(struct media_device *media,
+	__u32 id);
+
+/**
+ * @brief Get the number of entities
+ * @param media - media device.
+ *
+ * This function returns the total number of entities in the media device. If
+ * entities haven't been enumerated yet it will return 0.
+ *
+ * @return The number of entities in the media device
+ */
+unsigned int media_get_entities_count(struct media_device *media);
+
+/**
+ * @brief Get the entities
+ * @param media - media device.
+ *
+ * This function returns a pointer to the array of entities for the media
+ * device. If entities haven't been enumerated yet it will return NULL.
+ *
+ * The array of entities is owned by the media device object and will be freed
+ * when the media object is destroyed.
+ *
+ * @return A pointer to an array of entities
+ */
+struct media_entity *media_get_entity(struct media_device *media, unsigned int index);
+
+/**
+ * @brief Get the default entity for a given type
+ * @param media - media device.
+ * @param type - entity type.
+ *
+ * This function returns the default entity of the requested type. @a type must
+ * be one of
+ *
+ *	MEDIA_ENT_T_DEVNODE_V4L
+ *	MEDIA_ENT_T_DEVNODE_FB
+ *	MEDIA_ENT_T_DEVNODE_ALSA
+ *	MEDIA_ENT_T_DEVNODE_DVB
+ *
+ * @return A pointer to the default entity for the type if it exists, or NULL
+ * otherwise.
+ */
+struct media_entity *media_get_default_entity(struct media_device *media,
+					      unsigned int type);
+
+/**
+ * @brief Get the media device information
+ * @param media - media device.
+ *
+ * The information structure is owned by the media device object and will be freed
+ * when the media object is destroyed.
+ *
+ * @return A pointer to the media device information
+ */
+const struct media_device_info *media_get_info(struct media_device *media);
+
+/**
+ * @brief Get the media device node name
+ * @param media - media device.
+ *
+ * The device node name string is owned by the media device object and will be
+ * freed when the media object is destroyed.
+ *
+ * @return A pointer to the media device node name
+ */
+const char *media_get_devnode(struct media_device *media);
+
+/**
+ * @brief Configure a link.
+ * @param media - media device.
+ * @param source - source pad at the link origin.
+ * @param sink - sink pad at the link target.
+ * @param flags - configuration flags.
+ *
+ * Locate the link between @a source and @a sink, and configure it by applying
+ * the new @a flags.
+ *
+ * Only the MEDIA_LINK_FLAG_ENABLED flag is writable.
+ *
+ * @return 0 on success, -1 on failure:
+ *	   -ENOENT: link not found
+ *	   - other error codes returned by MEDIA_IOC_SETUP_LINK
+ */
+int media_setup_link(struct media_device *media,
+	struct media_pad *source, struct media_pad *sink,
+	__u32 flags);
+
+/**
+ * @brief Reset all links to the disabled state.
+ * @param media - media device.
+ *
+ * Disable all links in the media device. This function is usually used after
+ * opening a media device to reset all links to a known state.
+ *
+ * @return 0 on success, or a negative error code on failure.
+ */
+int media_reset_links(struct media_device *media);
+
+/**
+ * @brief Parse string to a pad on the media device.
+ * @param media - media device.
+ * @param p - input string
+ * @param endp - pointer to string where parsing ended
+ *
+ * Parse NULL terminated string describing a pad and return its struct
+ * media_pad instance.
+ *
+ * @return Pointer to struct media_pad on success, NULL on failure.
+ */
+struct media_pad *media_parse_pad(struct media_device *media,
+				  const char *p, char **endp);
+
+/**
+ * @brief Parse string to a link on the media device.
+ * @param media - media device.
+ * @param p - input string
+ * @param endp - pointer to p where parsing ended
+ *
+ * Parse NULL terminated string p describing a link and return its struct
+ * media_link instance.
+ *
+ * @return Pointer to struct media_link on success, NULL on failure.
+ */
+struct media_link *media_parse_link(struct media_device *media,
+				    const char *p, char **endp);
+
+/**
+ * @brief Parse string to a link on the media device and set it up.
+ * @param media - media device.
+ * @param p - input string
+ *
+ * Parse NULL terminated string p describing a link and its configuration
+ * and configure the link.
+ *
+ * @return 0 on success, or a negative error code on failure.
+ */
+int media_parse_setup_link(struct media_device *media,
+			   const char *p, char **endp);
+
+/**
+ * @brief Parse string to link(s) on the media device and set it up.
+ * @param media - media device.
+ * @param p - input string
+ *
+ * Parse NULL terminated string p describing link(s) separated by
+ * commas (,) and configure the link(s).
+ *
+ * @return 0 on success, or a negative error code on failure.
+ */
+int media_parse_setup_links(struct media_device *media, const char *p);
+
+#endif
diff --git a/3rdparty/media-ctl/include/v4l2subdev.h b/3rdparty/media-ctl/include/v4l2subdev.h
new file mode 100644
index 0000000..9c8fee8
--- /dev/null
+++ b/3rdparty/media-ctl/include/v4l2subdev.h
@@ -0,0 +1,289 @@
+/*
+ * V4L2 subdev interface library
+ *
+ * Copyright (C) 2010-2014 Ideas on board SPRL
+ *
+ * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __SUBDEV_H__
+#define __SUBDEV_H__
+
+#include <linux/v4l2-subdev.h>
+
+struct media_device;
+struct media_entity;
+
+/**
+ * @brief Open a sub-device.
+ * @param entity - sub-device media entity.
+ *
+ * Open the V4L2 subdev device node associated with @a entity. The file
+ * descriptor is stored in the media_entity structure.
+ *
+ * @return 0 on success, or a negative error code on failure.
+ */
+int v4l2_subdev_open(struct media_entity *entity);
+
+/**
+ * @brief Close a sub-device.
+ * @param entity - sub-device media entity.
+ *
+ * Close the V4L2 subdev device node associated with the @a entity and opened by
+ * a previous call to v4l2_subdev_open() (either explicit or implicit).
+ */
+void v4l2_subdev_close(struct media_entity *entity);
+
+/**
+ * @brief Retrieve the format on a pad.
+ * @param entity - subdev-device media entity.
+ * @param format - format to be filled.
+ * @param pad - pad number.
+ * @param which - identifier of the format to get.
+ *
+ * Retrieve the current format on the @a entity @a pad and store it in the
+ * @a format structure.
+ *
+ * @a which is set to V4L2_SUBDEV_FORMAT_TRY to retrieve the try format stored
+ * in the file handle, of V4L2_SUBDEV_FORMAT_ACTIVE to retrieve the current
+ * active format.
+ *
+ * @return 0 on success, or a negative error code on failure.
+ */
+int v4l2_subdev_get_format(struct media_entity *entity,
+	struct v4l2_mbus_framefmt *format, unsigned int pad,
+	enum v4l2_subdev_format_whence which);
+
+/**
+ * @brief Set the format on a pad.
+ * @param entity - subdev-device media entity.
+ * @param format - format.
+ * @param pad - pad number.
+ * @param which - identifier of the format to set.
+ *
+ * Set the format on the @a entity @a pad to @a format. The driver is allowed to
+ * modify the requested format, in which case @a format is updated with the
+ * modifications.
+ *
+ * @a which is set to V4L2_SUBDEV_FORMAT_TRY to set the try format stored in the
+ * file handle, of V4L2_SUBDEV_FORMAT_ACTIVE to configure the device with an
+ * active format.
+ *
+ * @return 0 on success, or a negative error code on failure.
+ */
+int v4l2_subdev_set_format(struct media_entity *entity,
+	struct v4l2_mbus_framefmt *format, unsigned int pad,
+	enum v4l2_subdev_format_whence which);
+
+/**
+ * @brief Retrieve a selection rectangle on a pad.
+ * @param entity - subdev-device media entity.
+ * @param r - rectangle to be filled.
+ * @param pad - pad number.
+ * @param target - selection target
+ * @param which - identifier of the format to get.
+ *
+ * Retrieve the @a target selection rectangle on the @a entity @a pad
+ * and store it in the @a rect structure.
+ *
+ * @a which is set to V4L2_SUBDEV_FORMAT_TRY to retrieve the try
+ * selection rectangle stored in the file handle, or
+ * V4L2_SUBDEV_FORMAT_ACTIVE to retrieve the current active selection
+ * rectangle.
+ *
+ * @return 0 on success, or a negative error code on failure.
+ */
+int v4l2_subdev_get_selection(struct media_entity *entity,
+	struct v4l2_rect *rect, unsigned int pad, unsigned int target,
+	enum v4l2_subdev_format_whence which);
+
+/**
+ * @brief Set a selection rectangle on a pad.
+ * @param entity - subdev-device media entity.
+ * @param rect - crop rectangle.
+ * @param pad - pad number.
+ * @param target - selection target
+ * @param which - identifier of the format to set.
+ *
+ * Set the @a target selection rectangle on the @a entity @a pad to @a
+ * rect. The driver is allowed to modify the requested rectangle, in
+ * which case @a rect is updated with the modifications.
+ *
+ * @a which is set to V4L2_SUBDEV_FORMAT_TRY to set the try crop rectangle
+ * stored in the file handle, of V4L2_SUBDEV_FORMAT_ACTIVE to configure the
+ * device with an active crop rectangle.
+ *
+ * @return 0 on success, or a negative error code on failure.
+ */
+int v4l2_subdev_set_selection(struct media_entity *entity,
+	struct v4l2_rect *rect, unsigned int pad, unsigned int target,
+	enum v4l2_subdev_format_whence which);
+
+/**
+ * @brief Query the digital video capabilities of a pad.
+ * @param entity - subdev-device media entity.
+ * @param cap - capabilities to be filled.
+ *
+ * Retrieve the digital video capabilities of the @a entity pad specified by
+ * @a cap.pad and store it in the @a cap structure.
+ *
+ * @return 0 on success, or a negative error code on failure.
+ */
+int v4l2_subdev_get_dv_timings_caps(struct media_entity *entity,
+	struct v4l2_dv_timings_cap *caps);
+
+/**
+ * @brief Query the digital video timings of a sub-device
+ * @param entity - subdev-device media entity.
+ * @param timings timings to be filled.
+ *
+ * Retrieve the detected digital video timings for the currently selected input
+ * of @a entity and store them in the @a timings structure.
+ *
+ * @return 0 on success, or a negative error code on failure.
+ */
+int v4l2_subdev_query_dv_timings(struct media_entity *entity,
+	struct v4l2_dv_timings *timings);
+
+/**
+ * @brief Get the current digital video timings of a sub-device
+ * @param entity - subdev-device media entity.
+ * @param timings timings to be filled.
+ *
+ * Retrieve the current digital video timings for the currently selected input
+ * of @a entity and store them in the @a timings structure.
+ *
+ * @return 0 on success, or a negative error code on failure.
+ */
+int v4l2_subdev_get_dv_timings(struct media_entity *entity,
+	struct v4l2_dv_timings *timings);
+
+/**
+ * @brief Set the digital video timings of a sub-device
+ * @param entity - subdev-device media entity.
+ * @param timings timings to be set.
+ *
+ * Set the digital video timings of @a entity to @a timings. The driver is
+ * allowed to modify the requested format, in which case @a timings is updated
+ * with the modifications.
+ *
+ * @return 0 on success, or a negative error code on failure.
+ */
+int v4l2_subdev_set_dv_timings(struct media_entity *entity,
+	struct v4l2_dv_timings *timings);
+
+/**
+ * @brief Retrieve the frame interval on a sub-device.
+ * @param entity - subdev-device media entity.
+ * @param interval - frame interval to be filled.
+ *
+ * Retrieve the current frame interval on subdev @a entity and store it in the
+ * @a interval structure.
+ *
+ * Frame interval retrieving is usually supported only on devices at the
+ * beginning of video pipelines, such as sensors.
+ *
+ * @return 0 on success, or a negative error code on failure.
+ */
+
+int v4l2_subdev_get_frame_interval(struct media_entity *entity,
+	struct v4l2_fract *interval);
+
+/**
+ * @brief Set the frame interval on a sub-device.
+ * @param entity - subdev-device media entity.
+ * @param interval - frame interval.
+ *
+ * Set the frame interval on subdev @a entity to @a interval. The driver is
+ * allowed to modify the requested frame interval, in which case @a interval is
+ * updated with the modifications.
+ *
+ * Frame interval setting is usually supported only on devices at the beginning
+ * of video pipelines, such as sensors.
+ *
+ * @return 0 on success, or a negative error code on failure.
+ */
+int v4l2_subdev_set_frame_interval(struct media_entity *entity,
+	struct v4l2_fract *interval);
+
+/**
+ * @brief Parse a string and apply format, crop and frame interval settings.
+ * @param media - media device.
+ * @param p - input string
+ * @param endp - pointer to string p where parsing ended (return)
+ *
+ * Parse string @a p and apply format, crop and frame interval settings to a
+ * subdev pad specified in @a p. @a endp will be written a pointer where
+ * parsing of @a p ended.
+ *
+ * Format strings are separeted by commas (,).
+ *
+ * @return 0 on success, or a negative error code on failure.
+ */
+int v4l2_subdev_parse_setup_formats(struct media_device *media, const char *p);
+
+/**
+ * @brief Convert media bus pixel code to string.
+ * @param code - input string
+ *
+ * Convert media bus pixel code @a code to a human-readable string.
+ *
+ * @return A pointer to a string on success, NULL on failure.
+ */
+const char *v4l2_subdev_pixelcode_to_string(enum v4l2_mbus_pixelcode code);
+
+/**
+ * @brief Parse string to media bus pixel code.
+ * @param string - nul terminalted string, textual media bus pixel code
+ *
+ * Parse human readable string @a string to an media bus pixel code.
+ *
+ * @return media bus pixelcode on success, -1 on failure.
+ */
+enum v4l2_mbus_pixelcode v4l2_subdev_string_to_pixelcode(const char *string);
+
+/**
+ * @brief Convert a field order to string.
+ * @param field - field order
+ *
+ * Convert field order @a field to a human-readable string.
+ *
+ * @return A pointer to a string on success, NULL on failure.
+ */
+const char *v4l2_subdev_field_to_string(enum v4l2_field field);
+
+/**
+ * @brief Parse string to field order.
+ * @param string - nul terminated string, textual media bus pixel code
+ *
+ * Parse human readable string @a string to field order.
+ *
+ * @return field order on success, -1 on failure.
+ */
+enum v4l2_field v4l2_subdev_string_to_field(const char *string);
+
+/**
+ * @brief Enumerate library supported media bus pixel codes.
+ * @param length - the number of the supported pixel codes
+ *
+ * Obtain pixel codes supported by libv4l2subdev.
+ *
+ * @return A pointer to the pixel code array
+ */
+const enum v4l2_mbus_pixelcode *v4l2_subdev_pixelcode_list(
+	unsigned int *length);
+
+#endif