/* * GStreamer * Copyright (C) 2007 David Schleef * * 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 */ /** * 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 #include #include #include #include #include <_stdint.h> #include "gstbayerorc.h" #define GST_CAT_DEFAULT gst_bayer2rgb_debug GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT); 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 > */ GstVideoInfo info; int width; int height; int r_off; /* offset for red */ int g_off; /* offset for green */ int b_off; /* offset for blue */ int format; }; struct _GstBayer2RGBClass { GstBaseTransformClass parent; }; #define SRC_CAPS \ GST_VIDEO_CAPS_MAKE ("{ RGBx, xRGB, BGRx, xBGR, RGBA, ARGB, BGRA, ABGR }") #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); #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, GstPadDirection direction, GstCaps * caps, GstCaps * filter); static gboolean gst_bayer2rgb_get_unit_size (GstBaseTransform * base, GstCaps * caps, gsize * size); static void gst_bayer2rgb_class_init (GstBayer2RGBClass * klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; 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", "Converts video/x-bayer to video/x-raw", "William Brack "); 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))); 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); GST_DEBUG_CATEGORY_INIT (gst_bayer2rgb_debug, "bayer2rgb", 0, "bayer2rgb element"); } static void 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) { GstBayer2RGB *bayer2rgb = GST_BAYER2RGB (base); GstStructure *structure; const char *format; GstVideoInfo info; GST_DEBUG ("in caps %" GST_PTR_FORMAT " out caps %" GST_PTR_FORMAT, incaps, outcaps); structure = gst_caps_get_structure (incaps, 0); 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 */ 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; gst_video_info_init (&filter->info); } static GstCaps * gst_bayer2rgb_transform_caps (GstBaseTransform * base, 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) { 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, 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); /* Our name must be either video/x-bayer video/x-raw */ if (strcmp (name, "video/x-raw")) { *size = GST_ROUND_UP_4 (width) * height; return TRUE; } else { /* 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); GstMapInfo map; uint8_t *output; GstVideoFrame frame; GST_DEBUG ("transforming buffer"); gst_buffer_map (inbuf, &map, GST_MAP_READ); 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, map.data, filter->width); gst_video_frame_unmap (&frame); gst_buffer_unmap (inbuf, &map); return GST_FLOW_OK; }