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gstreamer/subprojects/gst-plugins-good/sys/v4l2/gstv4l2object.h
Nicolas Dufresne 170dcd58db v4l2: Fix support for left and top padding 
In the current implementation, we support for most pixel format left
and top padding by changing the offset in the video meta. Though, to
align driver bytesused to the offset, we recalculate the offset, which
removed the modification we did before.

Instead, save the plane size, and truncate the driver reported bytesused
to the expected size, which ensures that the offsets still match. This
should also fix issues were the buffer size ended up bigger then the
pool size due to driver introduced padding.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4920>
2023-06-28 01:56:05 +00:00

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/* GStreamer
*
* Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
* 2006 Edgard Lima <edgard.lima@gmail.com>
*
* gstv4l2object.h: base class for V4L2 elements
*
* 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.
*/
#ifndef __GST_V4L2_OBJECT_H__
#define __GST_V4L2_OBJECT_H__
#include "ext/videodev2.h"
#ifdef HAVE_LIBV4L2
# include <libv4l2.h>
#endif
#include "v4l2-utils.h"
#include <gst/gst.h>
#include <gst/base/gstpushsrc.h>
#include <gst/video/video.h>
#include <unistd.h>
typedef struct _GstV4l2Object GstV4l2Object;
typedef struct _GstV4l2ObjectClassHelper GstV4l2ObjectClassHelper;
#include <gstv4l2bufferpool.h>
/* size of v4l2 buffer pool in streaming case, obj->info needs to be valid */
#define GST_V4L2_MIN_BUFFERS(obj) \
((GST_VIDEO_INFO_INTERLACE_MODE (&obj->info) == \
GST_VIDEO_INTERLACE_MODE_ALTERNATE) ? \
/* 2x buffers needed with each field in its own buffer */ \
4 : 2)
/* max frame width/height */
#define GST_V4L2_MAX_SIZE (1<<15) /* 2^15 == 32768 */
G_BEGIN_DECLS
#define GST_TYPE_V4L2_IO_MODE (gst_v4l2_io_mode_get_type ())
GType gst_v4l2_io_mode_get_type (void);
#define GST_V4L2_OBJECT(obj) (GstV4l2Object *)(obj)
typedef enum {
GST_V4L2_IO_AUTO = 0,
GST_V4L2_IO_RW = 1,
GST_V4L2_IO_MMAP = 2,
GST_V4L2_IO_USERPTR = 3,
GST_V4L2_IO_DMABUF = 4,
GST_V4L2_IO_DMABUF_IMPORT = 5
} GstV4l2IOMode;
typedef gboolean (*GstV4l2GetInOutFunction) (GstV4l2Object * v4l2object, guint32 * input);
typedef gboolean (*GstV4l2SetInOutFunction) (GstV4l2Object * v4l2object, guint32 input);
typedef gboolean (*GstV4l2UpdateFpsFunction) (GstV4l2Object * v4l2object);
/* On Android NDK r18b the ioctl() signature uses 'unsigned' instead of
* 'unsigned long' for the 2nd parameter */
#ifdef __ANDROID__
typedef unsigned ioctl_req_t;
#elif defined(__linux__) && !defined(__GLIBC__) /* musl/linux */
typedef int ioctl_req_t;
#else
typedef gulong ioctl_req_t;
#endif
#define GST_V4L2_WIDTH(o) (GST_VIDEO_INFO_WIDTH (&(o)->info))
#define GST_V4L2_HEIGHT(o) (GST_VIDEO_INFO_HEIGHT (&(o)->info))
#define GST_V4L2_PIXELFORMAT(o) ((o)->fmtdesc->pixelformat)
#define GST_V4L2_FPS_N(o) (GST_VIDEO_INFO_FPS_N (&(o)->info))
#define GST_V4L2_FPS_D(o) (GST_VIDEO_INFO_FPS_D (&(o)->info))
/* simple check whether the device is open */
#define GST_V4L2_IS_OPEN(o) ((o)->video_fd > 0)
/* check whether the device is 'active' */
#define GST_V4L2_IS_ACTIVE(o) ((o)->active)
#define GST_V4L2_SET_ACTIVE(o) ((o)->active = TRUE)
#define GST_V4L2_SET_INACTIVE(o) ((o)->active = FALSE)
/* checks whether the current v4lv4l2object has already been open()'ed or not */
#define GST_V4L2_CHECK_OPEN(v4l2object) \
if (!GST_V4L2_IS_OPEN(v4l2object)) \
{ \
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS, \
(_("Device is not open.")), (NULL)); \
return FALSE; \
}
/* checks whether the current v4lv4l2object is close()'ed or whether it is still open */
#define GST_V4L2_CHECK_NOT_OPEN(v4l2object) \
if (GST_V4L2_IS_OPEN(v4l2object)) \
{ \
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS, \
(_("Device is open.")), (NULL)); \
return FALSE; \
}
/* checks whether we're out of capture mode or not */
#define GST_V4L2_CHECK_NOT_ACTIVE(v4l2object) \
if (GST_V4L2_IS_ACTIVE(v4l2object)) \
{ \
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS, \
(NULL), ("Device is in streaming mode")); \
return FALSE; \
}
struct _GstV4l2Object {
GstElement * element;
GstObject * dbg_obj;
enum v4l2_buf_type type; /* V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_BUF_TYPE_VIDEO_OUTPUT */
/* the video device */
char *videodev;
/* the video-device's file descriptor */
gint video_fd;
GstV4l2IOMode mode;
GstPoll *poll;
GstPollFD pollfd;
gboolean can_poll_device;
gboolean active;
/* the current format */
struct v4l2_fmtdesc *fmtdesc;
struct v4l2_format format;
GstVideoInfo info;
GstVideoAlignment align;
GstVideoTransferFunction transfer;
gsize plane_size[GST_VIDEO_MAX_PLANES];
/* Features */
gboolean need_video_meta;
gboolean has_alpha_component;
/* only used if the device supports MPLANE
* nb planes is meaning of v4l2 planes
* the gstreamer equivalent is gst_buffer_n_memory
*/
gint n_v4l2_planes;
/* We cache the frame duration if known */
GstClockTime duration;
/* if the MPLANE device support both contiguous and non contiguous
* it allows to select which one we want. But we prefered_non_contiguous
* non contiguous mode.
*/
gboolean prefered_non_contiguous;
/* This will be set if supported in decide_allocation. It can be used to
* calculate the minimum latency. */
guint32 min_buffers;
/* wanted mode */
GstV4l2IOMode req_mode;
/* optional pool */
GstBufferPool *pool;
/* the sequence of pool to identify (for debugging) */
guint pool_seq;
/* the video device's capabilities */
struct v4l2_capability vcap;
/* opened device specific capabilities */
guint32 device_caps;
/* lists... */
GSList *formats; /* list of available capture formats */
GstCaps *probed_caps;
GList *colors;
GList *norms;
GList *channels;
GData *controls;
/* properties */
v4l2_std_id tv_norm;
gchar *channel;
gulong frequency;
GstStructure *extra_controls;
gboolean keep_aspect;
GValue *par;
/* funcs */
GstV4l2GetInOutFunction get_in_out_func;
GstV4l2SetInOutFunction set_in_out_func;
GstV4l2UpdateFpsFunction update_fps_func;
/* syscalls */
gint (*fd_open) (gint fd, gint v4l2_flags);
gint (*close) (gint fd);
gint (*dup) (gint fd);
gint (*ioctl) (gint fd, ioctl_req_t request, ...);
gssize (*read) (gint fd, gpointer buffer, gsize n);
gpointer (*mmap) (gpointer start, gsize length, gint prot, gint flags,
gint fd, off_t offset);
gint (*munmap) (gpointer _start, gsize length);
/* Quirks */
/* Skips interlacing probes */
gboolean never_interlaced;
/* Allow to skip reading initial format through G_FMT. Some devices
* just fails if you don't call S_FMT first. (ex: M2M decoders) */
gboolean no_initial_format;
/* Avoid any try_fmt probe. This is used by v4l2src to speedup start up time
* on slow USB firmwares. When this is set, gst_v4l2_set_format() will modify
* the caps to reflect what was negotiated during fixation */
gboolean skip_try_fmt_probes;
};
struct _GstV4l2ObjectClassHelper {
/* probed devices */
GList *devices;
};
GType gst_v4l2_object_get_type (void);
#define V4L2_STD_OBJECT_PROPS \
PROP_DEVICE, \
PROP_DEVICE_NAME, \
PROP_DEVICE_FD, \
PROP_FLAGS, \
PROP_BRIGHTNESS, \
PROP_CONTRAST, \
PROP_SATURATION, \
PROP_HUE, \
PROP_TV_NORM, \
PROP_IO_MODE, \
PROP_OUTPUT_IO_MODE, \
PROP_CAPTURE_IO_MODE, \
PROP_EXTRA_CONTROLS, \
PROP_PIXEL_ASPECT_RATIO, \
PROP_FORCE_ASPECT_RATIO
/* create/destroy */
GstV4l2Object* gst_v4l2_object_new (GstElement * element,
GstObject * dbg_obj,
enum v4l2_buf_type type,
const char * default_device,
GstV4l2GetInOutFunction get_in_out_func,
GstV4l2SetInOutFunction set_in_out_func,
GstV4l2UpdateFpsFunction update_fps_func);
void gst_v4l2_object_destroy (GstV4l2Object * v4l2object);
/* properties */
void gst_v4l2_object_install_properties_helper (GObjectClass * gobject_class,
const char * default_device);
void gst_v4l2_object_install_m2m_properties_helper (GObjectClass * gobject_class);
gboolean gst_v4l2_object_set_property_helper (GstV4l2Object * v4l2object,
guint prop_id,
const GValue * value,
GParamSpec * pspec);
gboolean gst_v4l2_object_get_property_helper (GstV4l2Object *v4l2object,
guint prop_id, GValue * value,
GParamSpec * pspec);
/* open/close */
gboolean gst_v4l2_object_open (GstV4l2Object * v4l2object, GstV4l2Error * error);
gboolean gst_v4l2_object_open_shared (GstV4l2Object * v4l2object, GstV4l2Object * other);
gboolean gst_v4l2_object_close (GstV4l2Object * v4l2object);
/* probing */
GstCaps* gst_v4l2_object_get_all_caps (void);
GstCaps* gst_v4l2_object_get_raw_caps (void);
GstCaps* gst_v4l2_object_get_codec_caps (void);
gboolean gst_v4l2_object_set_format (GstV4l2Object * v4l2object, GstCaps * caps, GstV4l2Error * error);
gboolean gst_v4l2_object_try_format (GstV4l2Object * v4l2object, GstCaps * caps, GstV4l2Error * error);
gboolean gst_v4l2_object_try_import (GstV4l2Object * v4l2object, GstBuffer * buffer);
gboolean gst_v4l2_object_caps_equal (GstV4l2Object * v4l2object, GstCaps * caps);
gboolean gst_v4l2_object_caps_is_subset (GstV4l2Object * v4l2object, GstCaps * caps);
GstCaps * gst_v4l2_object_get_current_caps (GstV4l2Object * v4l2object);
gboolean gst_v4l2_object_unlock (GstV4l2Object * v4l2object);
gboolean gst_v4l2_object_unlock_stop (GstV4l2Object * v4l2object);
gboolean gst_v4l2_object_stop (GstV4l2Object * v4l2object);
GstCaps * gst_v4l2_object_probe_caps (GstV4l2Object * v4l2object, GstCaps * filter);
GstCaps * gst_v4l2_object_get_caps (GstV4l2Object * v4l2object, GstCaps * filter);
gboolean gst_v4l2_object_acquire_format (GstV4l2Object * v4l2object, GstVideoInfo * info);
gboolean gst_v4l2_object_setup_padding (GstV4l2Object * obj);
gboolean gst_v4l2_object_decide_allocation (GstV4l2Object * v4l2object, GstQuery * query);
gboolean gst_v4l2_object_propose_allocation (GstV4l2Object * obj, GstQuery * query);
GstBufferPool * gst_v4l2_object_get_buffer_pool (GstV4l2Object * v4l2object);
GstStructure * gst_v4l2_object_v4l2fourcc_to_structure (guint32 fourcc);
GstFlowReturn gst_v4l2_object_poll (GstV4l2Object * v4l2object, GstClockTime timeout);
gboolean gst_v4l2_object_subscribe_event (GstV4l2Object * v4l2object, guint32 event);
gboolean gst_v4l2_object_is_raw (GstV4l2Object * obj);
/* crop / compose */
gboolean gst_v4l2_object_set_crop (GstV4l2Object * obj, struct v4l2_rect *result);
gboolean gst_v4l2_object_get_crop_bounds (GstV4l2Object * obj, struct v4l2_rect *bounds);
gboolean gst_v4l2_object_get_crop_default (GstV4l2Object * obj, struct v4l2_rect *bounds);
/* TODO Move to proper namespace */
/* open/close the device */
gboolean gst_v4l2_open (GstV4l2Object * v4l2object, GstV4l2Error * error);
gboolean gst_v4l2_dup (GstV4l2Object * v4l2object, GstV4l2Object * other);
gboolean gst_v4l2_close (GstV4l2Object * v4l2object);
/* norm/input/output */
gboolean gst_v4l2_get_norm (GstV4l2Object * v4l2object, v4l2_std_id * norm);
gboolean gst_v4l2_set_norm (GstV4l2Object * v4l2object, v4l2_std_id norm);
gboolean gst_v4l2_get_input (GstV4l2Object * v4l2object, guint32 * input);
gboolean gst_v4l2_set_input (GstV4l2Object * v4l2object, guint32 input);
gboolean gst_v4l2_query_input (GstV4l2Object * v4l2object, struct v4l2_input * input);
gboolean gst_v4l2_get_output (GstV4l2Object * v4l2object, guint32 * output);
gboolean gst_v4l2_set_output (GstV4l2Object * v4l2object, guint32 output);
/* dv timings */
gboolean gst_v4l2_set_dv_timings (GstV4l2Object * v4l2object, struct v4l2_dv_timings *timings);
gboolean gst_v4l2_query_dv_timings (GstV4l2Object * v4l2object, struct v4l2_dv_timings *timings);
/* frequency control */
gboolean gst_v4l2_get_frequency (GstV4l2Object * v4l2object, gint tunernum, gulong * frequency);
gboolean gst_v4l2_set_frequency (GstV4l2Object * v4l2object, gint tunernum, gulong frequency);
gboolean gst_v4l2_signal_strength (GstV4l2Object * v4l2object, gint tunernum, gulong * signal);
/* attribute control */
gboolean gst_v4l2_get_attribute (GstV4l2Object * v4l2object, int attribute, int * value);
gboolean gst_v4l2_set_attribute (GstV4l2Object * v4l2object, int attribute, const int value);
gboolean gst_v4l2_set_string_attribute (GstV4l2Object * v4l2object, int attribute_num, const char *value);
gboolean gst_v4l2_set_controls (GstV4l2Object * v4l2object, GstStructure * controls);
/* events */
gboolean gst_v4l2_subscribe_event (GstV4l2Object * v4l2object, guint32 event, guint32 id);
gboolean gst_v4l2_dequeue_event (GstV4l2Object * v4l2object, struct v4l2_event *event);
G_END_DECLS
#endif /* __GST_V4L2_OBJECT_H__ */
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