gstreamer/gst/bayer/gstbayer2rgb.c

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/*
* GStreamer
* Copyright (C) 2007 David Schleef <ds@schleef.org>
*
* 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.
*
* March 2008
* Logic enhanced by William Brack <wbrack@mmm.com.hk>
*/
/**
* SECTION:element-bayer2rgb
*
* Decodes raw camera bayer (fourcc BA81) to RGB.
*/
/*
* In order to guard against my advancing maturity, some extra detailed
* information about the logic of the decode is included here. Much of
* this was inspired by a technical paper from siliconimaging.com, which
* in turn was based upon an article from IEEE,
* T. Sakamoto, C. Nakanishi and T. Hase,
* Software pixel interpolation for digital still cameras suitable for
* a 32-bit MCU,
* IEEE Trans. Consumer Electronics, vol. 44, no. 4, November 1998.
*
* The code assumes a Bayer matrix of the type produced by the fourcc
* BA81 (v4l2 format SBGGR8) of width w and height h which looks like:
* 0 1 2 3 w-2 w-1
*
* 0 B G B G ....B G
* 1 G R G R ....G R
* 2 B G B G ....B G
* ...............
* h-2 B G B G ....B G
* h-1 G R G R ....G R
*
* We expand this matrix, producing a separate {r, g, b} triple for each
* of the individual elements. The algorithm for doing this expansion is
* as follows.
*
* We are designing for speed of transformation, at a slight expense of code.
* First, we calculate the appropriate triples for the four corners, the
* remainder of the top and bottom rows, and the left and right columns.
* The reason for this is that those elements are transformed slightly
* differently than all of the remainder of the matrix. Finally, we transform
* all of the remainder.
*
* The transformation into the "appropriate triples" is based upon the
* "nearest neighbor" principal, with some additional complexity for the
* calculation of the "green" element, where an "adaptive" pairing is used.
*
* For purposes of documentation and indentification, each element of the
* original array can be put into one of four classes:
* R A red element
* B A blue element
* GR A green element which is followed by a red one
* GB A green element which is followed by a blue one
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/base/gstbasetransform.h>
#include <gst/video/video.h>
#include <string.h>
#include <stdlib.h>
#include <_stdint.h>
#include "gstbayerorc.h"
#define GST_CAT_DEFAULT gst_bayer2rgb_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
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enum
{
GST_BAYER_2_RGB_FORMAT_BGGR = 0,
GST_BAYER_2_RGB_FORMAT_GBRG,
GST_BAYER_2_RGB_FORMAT_GRBG,
GST_BAYER_2_RGB_FORMAT_RGGB
};
#define GST_TYPE_BAYER2RGB (gst_bayer2rgb_get_type())
#define GST_BAYER2RGB(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_BAYER2RGB,GstBayer2RGB))
#define GST_IS_BAYER2RGB(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_BAYER2RGB))
#define GST_BAYER2RGB_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass) ,GST_TYPE_BAYER2RGB,GstBayer2RGBClass))
#define GST_IS_BAYER2RGB_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass) ,GST_TYPE_BAYER2RGB))
#define GST_BAYER2RGB_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj) ,GST_TYPE_BAYER2RGB,GstBayer2RGBClass))
typedef struct _GstBayer2RGB GstBayer2RGB;
typedef struct _GstBayer2RGBClass GstBayer2RGBClass;
typedef void (*GstBayer2RGBProcessFunc) (GstBayer2RGB *, guint8 *, guint);
struct _GstBayer2RGB
{
GstBaseTransform basetransform;
/* < private > */
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GstVideoInfo info;
int width;
int height;
int r_off; /* offset for red */
int g_off; /* offset for green */
int b_off; /* offset for blue */
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int format;
};
struct _GstBayer2RGBClass
{
GstBaseTransformClass parent;
};
#define SRC_CAPS \
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GST_VIDEO_CAPS_MAKE ("{ RGBx, xRGB, BGRx, xBGR, RGBA, ARGB, BGRA, ABGR }")
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#define SINK_CAPS "video/x-bayer,format=(string){bggr,grbg,gbrg,rggb}," \
"width=(int)[1,MAX],height=(int)[1,MAX],framerate=(fraction)[0/1,MAX]"
enum
{
PROP_0
};
GType gst_bayer2rgb_get_type (void);
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#define gst_bayer2rgb_parent_class parent_class
G_DEFINE_TYPE (GstBayer2RGB, gst_bayer2rgb, GST_TYPE_BASE_TRANSFORM);
static void gst_bayer2rgb_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_bayer2rgb_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_bayer2rgb_set_caps (GstBaseTransform * filter,
GstCaps * incaps, GstCaps * outcaps);
static GstFlowReturn gst_bayer2rgb_transform (GstBaseTransform * base,
GstBuffer * inbuf, GstBuffer * outbuf);
static void gst_bayer2rgb_reset (GstBayer2RGB * filter);
static GstCaps *gst_bayer2rgb_transform_caps (GstBaseTransform * base,
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GstPadDirection direction, GstCaps * caps, GstCaps * filter);
static gboolean gst_bayer2rgb_get_unit_size (GstBaseTransform * base,
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GstCaps * caps, gsize * size);
static void
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gst_bayer2rgb_class_init (GstBayer2RGBClass * klass)
{
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GObjectClass *gobject_class;
GstElementClass *gstelement_class;
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gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gobject_class->set_property = gst_bayer2rgb_set_property;
gobject_class->get_property = gst_bayer2rgb_get_property;
gst_element_class_set_details_simple (gstelement_class,
"Bayer to RGB decoder for cameras", "Filter/Converter/Video",
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"Converts video/x-bayer to video/x-raw",
"William Brack <wbrack@mmm.com.hk>");
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gst_element_class_add_pad_template (gstelement_class,
gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
gst_caps_from_string (SRC_CAPS)));
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gst_element_class_add_pad_template (gstelement_class,
gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
gst_caps_from_string (SINK_CAPS)));
GST_BASE_TRANSFORM_CLASS (klass)->transform_caps =
GST_DEBUG_FUNCPTR (gst_bayer2rgb_transform_caps);
GST_BASE_TRANSFORM_CLASS (klass)->get_unit_size =
GST_DEBUG_FUNCPTR (gst_bayer2rgb_get_unit_size);
GST_BASE_TRANSFORM_CLASS (klass)->set_caps =
GST_DEBUG_FUNCPTR (gst_bayer2rgb_set_caps);
GST_BASE_TRANSFORM_CLASS (klass)->transform =
GST_DEBUG_FUNCPTR (gst_bayer2rgb_transform);
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GST_DEBUG_CATEGORY_INIT (gst_bayer2rgb_debug, "bayer2rgb", 0,
"bayer2rgb element");
}
static void
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gst_bayer2rgb_init (GstBayer2RGB * filter)
{
gst_bayer2rgb_reset (filter);
gst_base_transform_set_in_place (GST_BASE_TRANSFORM (filter), TRUE);
}
/* No properties are implemented, so only a warning is produced */
static void
gst_bayer2rgb_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_bayer2rgb_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_bayer2rgb_set_caps (GstBaseTransform * base, GstCaps * incaps,
GstCaps * outcaps)
{
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GstBayer2RGB *bayer2rgb = GST_BAYER2RGB (base);
GstStructure *structure;
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const char *format;
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GstVideoInfo info;
GST_DEBUG ("in caps %" GST_PTR_FORMAT " out caps %" GST_PTR_FORMAT, incaps,
outcaps);
structure = gst_caps_get_structure (incaps, 0);
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gst_structure_get_int (structure, "width", &bayer2rgb->width);
gst_structure_get_int (structure, "height", &bayer2rgb->height);
format = gst_structure_get_string (structure, "format");
if (g_str_equal (format, "bggr")) {
bayer2rgb->format = GST_BAYER_2_RGB_FORMAT_BGGR;
} else if (g_str_equal (format, "gbrg")) {
bayer2rgb->format = GST_BAYER_2_RGB_FORMAT_GBRG;
} else if (g_str_equal (format, "grbg")) {
bayer2rgb->format = GST_BAYER_2_RGB_FORMAT_GRBG;
} else if (g_str_equal (format, "rggb")) {
bayer2rgb->format = GST_BAYER_2_RGB_FORMAT_RGGB;
} else {
return FALSE;
}
/* To cater for different RGB formats, we need to set params for later */
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gst_video_info_from_caps (&info, outcaps);
bayer2rgb->r_off = GST_VIDEO_INFO_COMP_OFFSET (&info, 0);
bayer2rgb->g_off = GST_VIDEO_INFO_COMP_OFFSET (&info, 1);
bayer2rgb->b_off = GST_VIDEO_INFO_COMP_OFFSET (&info, 2);
bayer2rgb->info = info;
return TRUE;
}
static void
gst_bayer2rgb_reset (GstBayer2RGB * filter)
{
filter->width = 0;
filter->height = 0;
filter->r_off = 0;
filter->g_off = 0;
filter->b_off = 0;
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gst_video_info_init (&filter->info);
}
static GstCaps *
gst_bayer2rgb_transform_caps (GstBaseTransform * base,
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GstPadDirection direction, GstCaps * caps, GstCaps * filter)
{
GstStructure *structure;
GstCaps *newcaps;
GstStructure *newstruct;
GST_DEBUG_OBJECT (caps, "transforming caps (from)");
structure = gst_caps_get_structure (caps, 0);
if (direction == GST_PAD_SRC) {
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newcaps = gst_caps_from_string ("video/x-bayer,"
"format=(string){bggr,grbg,gbrg,rggb}");
} else {
newcaps = gst_caps_new_empty_simple ("video/x-raw");
}
newstruct = gst_caps_get_structure (newcaps, 0);
gst_structure_set_value (newstruct, "width",
gst_structure_get_value (structure, "width"));
gst_structure_set_value (newstruct, "height",
gst_structure_get_value (structure, "height"));
gst_structure_set_value (newstruct, "framerate",
gst_structure_get_value (structure, "framerate"));
GST_DEBUG_OBJECT (newcaps, "transforming caps (into)");
return newcaps;
}
static gboolean
gst_bayer2rgb_get_unit_size (GstBaseTransform * base, GstCaps * caps,
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gsize * size)
{
GstStructure *structure;
int width;
int height;
const char *name;
structure = gst_caps_get_structure (caps, 0);
if (gst_structure_get_int (structure, "width", &width) &&
gst_structure_get_int (structure, "height", &height)) {
name = gst_structure_get_name (structure);
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/* Our name must be either video/x-bayer video/x-raw */
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if (strcmp (name, "video/x-raw")) {
*size = GST_ROUND_UP_4 (width) * height;
return TRUE;
} else {
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/* For output, calculate according to format (always 32 bits) */
*size = width * height * 4;
return TRUE;
}
}
GST_ELEMENT_ERROR (base, CORE, NEGOTIATION, (NULL),
("Incomplete caps, some required field missing"));
return FALSE;
}
static void
gst_bayer2rgb_split_and_upsample_horiz (guint8 * dest0, guint8 * dest1,
const guint8 * src, int n)
{
int i;
dest0[0] = src[0];
dest1[0] = src[1];
dest0[1] = (src[0] + src[2] + 1) >> 1;
dest1[1] = src[1];
#if defined(__i386__) || defined(__amd64__)
gst_bayer_horiz_upsample_unaligned (dest0 + 2, dest1 + 2, src + 1,
(n - 4) >> 1);
#else
gst_bayer_horiz_upsample (dest0 + 2, dest1 + 2, src + 2, (n - 4) >> 1);
#endif
for (i = n - 2; i < n; i++) {
if ((i & 1) == 0) {
dest0[i] = src[i];
dest1[i] = src[i - 1];
} else {
dest0[i] = src[i - 1];
dest1[i] = src[i];
}
}
}
typedef void (*process_func) (guint8 * d0, const guint8 * s0, const guint8 * s1,
const guint8 * s2, const guint8 * s3, const guint8 * s4, const guint8 * s5,
int n);
static void
gst_bayer2rgb_process (GstBayer2RGB * bayer2rgb, uint8_t * dest,
int dest_stride, uint8_t * src, int src_stride)
{
int j;
guint8 *tmp;
process_func merge[2] = { NULL, NULL };
int r_off, g_off, b_off;
/* We exploit some symmetry in the functions here. The base functions
* are all named for the BGGR arrangement. For RGGB, we swap the
* red offset and blue offset in the output. For GRBG, we swap the
* order of the merge functions. For GBRG, do both. */
r_off = bayer2rgb->r_off;
g_off = bayer2rgb->g_off;
b_off = bayer2rgb->b_off;
if (bayer2rgb->format == GST_BAYER_2_RGB_FORMAT_RGGB ||
bayer2rgb->format == GST_BAYER_2_RGB_FORMAT_GBRG) {
r_off = bayer2rgb->b_off;
b_off = bayer2rgb->r_off;
}
if (r_off == 2 && g_off == 1 && b_off == 0) {
merge[0] = gst_bayer_merge_bg_bgra;
merge[1] = gst_bayer_merge_gr_bgra;
} else if (r_off == 3 && g_off == 2 && b_off == 1) {
merge[0] = gst_bayer_merge_bg_abgr;
merge[1] = gst_bayer_merge_gr_abgr;
} else if (r_off == 1 && g_off == 2 && b_off == 3) {
merge[0] = gst_bayer_merge_bg_argb;
merge[1] = gst_bayer_merge_gr_argb;
} else if (r_off == 0 && g_off == 1 && b_off == 2) {
merge[0] = gst_bayer_merge_bg_rgba;
merge[1] = gst_bayer_merge_gr_rgba;
}
if (bayer2rgb->format == GST_BAYER_2_RGB_FORMAT_GRBG ||
bayer2rgb->format == GST_BAYER_2_RGB_FORMAT_GBRG) {
process_func tmp = merge[0];
merge[0] = merge[1];
merge[1] = tmp;
}
tmp = g_malloc (2 * 4 * bayer2rgb->width);
#define LINE(x) (tmp + ((x)&7) * bayer2rgb->width)
gst_bayer2rgb_split_and_upsample_horiz (LINE (3 * 2 + 0), LINE (3 * 2 + 1),
src + 1 * src_stride, bayer2rgb->width);
j = 0;
gst_bayer2rgb_split_and_upsample_horiz (LINE (j * 2 + 0), LINE (j * 2 + 1),
src + j * src_stride, bayer2rgb->width);
for (j = 0; j < bayer2rgb->height; j++) {
if (j < bayer2rgb->height - 1) {
gst_bayer2rgb_split_and_upsample_horiz (LINE ((j + 1) * 2 + 0),
LINE ((j + 1) * 2 + 1), src + (j + 1) * src_stride, bayer2rgb->width);
}
merge[j & 1] (dest + j * dest_stride,
LINE (j * 2 - 2), LINE (j * 2 - 1),
LINE (j * 2 + 0), LINE (j * 2 + 1),
LINE (j * 2 + 2), LINE (j * 2 + 3), bayer2rgb->width >> 1);
}
g_free (tmp);
}
static GstFlowReturn
gst_bayer2rgb_transform (GstBaseTransform * base, GstBuffer * inbuf,
GstBuffer * outbuf)
{
GstBayer2RGB *filter = GST_BAYER2RGB (base);
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GstMapInfo map;
uint8_t *output;
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GstVideoFrame frame;
GST_DEBUG ("transforming buffer");
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gst_buffer_map (inbuf, &map, GST_MAP_READ);
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gst_video_frame_map (&frame, &filter->info, inbuf, GST_MAP_WRITE);
output = GST_VIDEO_FRAME_PLANE_DATA (&frame, 0);
gst_bayer2rgb_process (filter, output, filter->width * 4,
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map.data, filter->width);
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gst_video_frame_unmap (&frame);
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gst_buffer_unmap (inbuf, &map);
return GST_FLOW_OK;
}