gstreamer/ext/cog/gstlogoinsert.c

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/* GStreamer
* Copyright (C) 2008 David Schleef <ds@entropywave.com>
*
* 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.
*/
#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 <cog/cog.h>
#include <cog/cogvirtframe.h>
#include <math.h>
#include <png.h>
#include "gstcogutils.h"
#define GST_TYPE_LOGOINSERT \
(gst_logoinsert_get_type())
#define GST_LOGOINSERT(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_LOGOINSERT,GstLogoinsert))
#define GST_LOGOINSERT_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_LOGOINSERT,GstLogoinsertClass))
#define GST_IS_LOGOINSERT(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_LOGOINSERT))
#define GST_IS_LOGOINSERT_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_LOGOINSERT))
typedef struct _GstLogoinsert GstLogoinsert;
typedef struct _GstLogoinsertClass GstLogoinsertClass;
struct _GstLogoinsert
{
GstBaseTransform base_transform;
gchar *location;
GstVideoFormat format;
int width;
int height;
gchar *data;
gsize size;
CogFrame *overlay_frame;
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CogFrame *argb_frame;
CogFrame *alpha_frame;
};
struct _GstLogoinsertClass
{
GstBaseTransformClass parent_class;
};
enum
{
ARG_0,
ARG_LOCATION,
};
GType gst_logoinsert_get_type (void);
static void gst_logoinsert_base_init (gpointer g_class);
static void gst_logoinsert_class_init (gpointer g_class, gpointer class_data);
static void gst_logoinsert_init (GTypeInstance * instance, gpointer g_class);
static void gst_logoinsert_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_logoinsert_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_logoinsert_set_location (GstLogoinsert * li,
const gchar * location);
static gboolean gst_logoinsert_set_caps (GstBaseTransform * base_transform,
GstCaps * incaps, GstCaps * outcaps);
static GstFlowReturn gst_logoinsert_transform_ip (GstBaseTransform *
base_transform, GstBuffer * buf);
static CogFrame *cog_frame_new_from_png (void *data, int size);
static CogFrame *cog_virt_frame_extract_alpha (CogFrame * frame);
static CogFrame *cog_frame_realize (CogFrame * frame);
static GstStaticPadTemplate gst_logoinsert_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("I420"))
);
static GstStaticPadTemplate gst_logoinsert_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("I420"))
);
GType
gst_logoinsert_get_type (void)
{
static GType compress_type = 0;
if (!compress_type) {
static const GTypeInfo compress_info = {
sizeof (GstLogoinsertClass),
gst_logoinsert_base_init,
NULL,
gst_logoinsert_class_init,
NULL,
NULL,
sizeof (GstLogoinsert),
0,
gst_logoinsert_init,
};
compress_type = g_type_register_static (GST_TYPE_BASE_TRANSFORM,
"GstLogoinsert", &compress_info, 0);
}
return compress_type;
}
static void
gst_logoinsert_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_logoinsert_src_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_logoinsert_sink_template));
gst_element_class_set_details_simple (element_class,
"Overlay image onto video", "Filter/Effect/Video",
"Overlay image onto video", "David Schleef <ds@schleef.org>");
}
static void
gst_logoinsert_class_init (gpointer g_class, gpointer class_data)
{
GObjectClass *gobject_class;
GstBaseTransformClass *base_transform_class;
GstLogoinsertClass *filter_class;
gobject_class = G_OBJECT_CLASS (g_class);
base_transform_class = GST_BASE_TRANSFORM_CLASS (g_class);
filter_class = GST_LOGOINSERT_CLASS (g_class);
gobject_class->set_property = gst_logoinsert_set_property;
gobject_class->get_property = gst_logoinsert_get_property;
g_object_class_install_property (gobject_class, ARG_LOCATION,
g_param_spec_string ("location", "location",
"location of PNG file to overlay", "", G_PARAM_READWRITE));
base_transform_class->set_caps = gst_logoinsert_set_caps;
base_transform_class->transform_ip = gst_logoinsert_transform_ip;
}
static void
gst_logoinsert_init (GTypeInstance * instance, gpointer g_class)
{
GST_DEBUG ("gst_logoinsert_init");
}
static void
gst_logoinsert_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstLogoinsert *src;
g_return_if_fail (GST_IS_LOGOINSERT (object));
src = GST_LOGOINSERT (object);
GST_DEBUG ("gst_logoinsert_set_property");
switch (prop_id) {
case ARG_LOCATION:
gst_logoinsert_set_location (src, g_value_get_string (value));
break;
default:
break;
}
}
static void
gst_logoinsert_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstLogoinsert *src;
g_return_if_fail (GST_IS_LOGOINSERT (object));
src = GST_LOGOINSERT (object);
switch (prop_id) {
case ARG_LOCATION:
g_value_set_string (value, src->location);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_logoinsert_set_caps (GstBaseTransform * base_transform,
GstCaps * incaps, GstCaps * outcaps)
{
GstLogoinsert *li;
g_return_val_if_fail (GST_IS_LOGOINSERT (base_transform), GST_FLOW_ERROR);
li = GST_LOGOINSERT (base_transform);
gst_video_format_parse_caps (incaps, &li->format, &li->width, &li->height);
return TRUE;
}
static GstFlowReturn
gst_logoinsert_transform_ip (GstBaseTransform * base_transform, GstBuffer * buf)
{
GstLogoinsert *li;
CogFrame *frame;
g_return_val_if_fail (GST_IS_LOGOINSERT (base_transform), GST_FLOW_ERROR);
li = GST_LOGOINSERT (base_transform);
frame = gst_cog_buffer_wrap (buf, li->format, li->width, li->height);
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if (li->argb_frame == NULL)
return GST_FLOW_OK;
if (li->overlay_frame == NULL) {
CogFrame *f;
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f = cog_virt_frame_extract_alpha (cog_frame_ref (li->argb_frame));
f = cog_virt_frame_new_subsample (f, frame->format,
COG_CHROMA_SITE_MPEG2, 2);
li->alpha_frame = cog_frame_realize (f);
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f = cog_virt_frame_new_unpack (cog_frame_ref (li->argb_frame));
f = cog_virt_frame_new_color_matrix_RGB_to_YCbCr (f, COG_COLOR_MATRIX_SDTV,
8);
f = cog_virt_frame_new_subsample (f, frame->format,
COG_CHROMA_SITE_MPEG2, 2);
li->overlay_frame = cog_frame_realize (f);
}
if (1) {
int i, j;
int k;
guint8 *dest;
guint8 *src;
guint8 *alpha;
int offset_x, offset_y;
for (k = 0; k < 3; k++) {
offset_x = frame->components[k].width -
li->alpha_frame->components[k].width;
offset_y = frame->components[k].height -
li->alpha_frame->components[k].height;
for (j = 0; j < li->overlay_frame->components[k].height; j++) {
dest = COG_FRAME_DATA_GET_LINE (frame->components + k, j + offset_y);
src = COG_FRAME_DATA_GET_LINE (li->overlay_frame->components + k, j);
alpha = COG_FRAME_DATA_GET_LINE (li->alpha_frame->components + k, j);
#define oil_divide_255(x) ((((x)+128) + (((x)+128)>>8))>>8)
for (i = 0; i < li->overlay_frame->components[k].width; i++) {
dest[i + offset_x] =
oil_divide_255 (src[i] * alpha[i] + dest[i + offset_x] * (255 -
alpha[i]));
}
}
}
}
return GST_FLOW_OK;
}
static void
gst_logoinsert_set_location (GstLogoinsert * li, const gchar * location)
{
gboolean ret;
GError *error = NULL;
g_free (li->location);
g_free (li->data);
if (li->overlay_frame) {
cog_frame_unref (li->overlay_frame);
li->overlay_frame = NULL;
}
li->location = g_strdup (location);
ret = g_file_get_contents (li->location, &li->data, &li->size, &error);
if (!ret) {
li->data = NULL;
li->size = 0;
return;
}
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li->argb_frame = cog_frame_new_from_png (li->data, li->size);
if (li->alpha_frame) {
cog_frame_unref (li->alpha_frame);
li->alpha_frame = NULL;
}
if (li->overlay_frame) {
cog_frame_unref (li->overlay_frame);
li->overlay_frame = NULL;
}
}
/* load PNG into CogFrame */
struct png_data_struct
{
unsigned char *data;
int size;
int offset;
};
static void
read_data (png_structp png_ptr, png_bytep data, png_size_t length)
{
struct png_data_struct *s = png_get_io_ptr (png_ptr);
memcpy (data, s->data + s->offset, length);
s->offset += length;
}
static CogFrame *
cog_frame_new_from_png (void *data, int size)
{
struct png_data_struct s = { 0 };
png_structp png_ptr;
png_infop info_ptr;
png_bytep *rows;
CogFrame *frame;
guchar *frame_data;
int rowbytes;
int j;
int width, height;
int color_type;
png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
info_ptr = png_create_info_struct (png_ptr);
s.data = data;
s.size = size;
png_set_read_fn (png_ptr, (void *) &s, read_data);
png_read_info (png_ptr, info_ptr);
width = png_get_image_width (png_ptr, info_ptr);
height = png_get_image_height (png_ptr, info_ptr);
color_type = png_get_color_type (png_ptr, info_ptr);
GST_DEBUG ("PNG size %dx%d color_type %d", width, height, color_type);
png_set_strip_16 (png_ptr);
png_set_packing (png_ptr);
if (color_type == PNG_COLOR_TYPE_RGB) {
png_set_filler (png_ptr, 0xff, PNG_FILLER_BEFORE);
}
if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
png_set_swap_alpha (png_ptr);
}
frame_data = g_malloc (width * height * 4);
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frame = cog_frame_new_from_data_ARGB (frame_data, width, height);
rowbytes = png_get_rowbytes (png_ptr, info_ptr);
rows = (png_bytep *) g_malloc (sizeof (png_bytep) * height);
for (j = 0; j < height; j++) {
rows[j] = COG_FRAME_DATA_GET_LINE (frame->components + 0, j);
}
png_read_image (png_ptr, rows);
g_free (rows);
png_destroy_read_struct (&png_ptr, &info_ptr, (png_infopp) NULL);
return frame;
}
static void
extract_alpha (CogFrame * frame, void *_dest, int component, int j)
{
uint8_t *dest = _dest;
uint8_t *src;
int i;
src = COG_FRAME_DATA_GET_LINE (frame->virt_frame1->components + 0, j);
for (i = 0; i < frame->width; i++) {
dest[i] = src[i * 4 + 0];
}
}
static CogFrame *
cog_virt_frame_extract_alpha (CogFrame * frame)
{
CogFrame *virt_frame;
/* FIXME check that frame is a real AYUV frame */
virt_frame = cog_frame_new_virtual (NULL, COG_FRAME_FORMAT_U8_444,
frame->width, frame->height);
virt_frame->virt_frame1 = frame;
virt_frame->render_line = extract_alpha;
return virt_frame;
}
static CogFrame *
cog_frame_realize (CogFrame * frame)
{
CogFrame *dest;
dest = cog_frame_clone (NULL, frame);
cog_virt_frame_render (frame, dest);
cog_frame_unref (frame);
return dest;
}