gstreamer/ext/libcaca/gstcacatv.c
2020-06-06 00:42:25 +02:00

403 lines
13 KiB
C

/* GStreamer
* Copyright (C) <2019> Eric Marks <bigmarkslp@gmail.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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-cacatv
* @see_also: #GstCacaSink
*
* Transforms video into color ascii art.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch-1.0 videotestsrc ! cacatv ! videoconvert ! autovideosink
* ]| This pipeline shows the effect of cacatv on a test stream.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstcacatv.h"
/* cacatv signals and args */
enum
{
LAST_SIGNAL
};
#define GST_CACA_DEFAULT_FONT 0
#define GST_CACA_DEFAULT_SCREEN_WIDTH 80
#define GST_CACA_DEFAULT_SCREEN_HEIGHT 24
#define GST_CACA_DEFAULT_DITHER CACA_DITHERING_NONE
#define GST_CACA_DEFAULT_ANTIALIASING FALSE
enum
{
PROP_0,
PROP_CANVAS_WIDTH,
PROP_CANVAS_HEIGHT,
PROP_FONT,
PROP_DITHER,
PROP_ANTIALIASING
};
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE
("{ RGB, BGR, RGBx, xRGB, BGRx, xBGR, RGBA, RGB16, RGB15 }"))
);
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("{ ARGB }"))
);
static GstFlowReturn
gst_cacatv_transform_frame (GstVideoFilter * vfilter, GstVideoFrame * in_frame,
GstVideoFrame * out_frame)
{
GstCACATv *cacatv = GST_CACATV (vfilter);
GST_OBJECT_LOCK (cacatv);
caca_clear_canvas (cacatv->canvas);
caca_dither_bitmap (cacatv->canvas, 0, 0,
caca_get_canvas_width (cacatv->canvas),
caca_get_canvas_height (cacatv->canvas), cacatv->dither,
GST_VIDEO_FRAME_PLANE_DATA (in_frame, 0));
/* libcaca always renders ARGB */
caca_render_canvas (cacatv->canvas, cacatv->font,
GST_VIDEO_FRAME_PLANE_DATA (out_frame, 0), cacatv->src_width,
cacatv->src_height, 4 * cacatv->src_width);
GST_OBJECT_UNLOCK (cacatv);
return GST_FLOW_OK;
}
static void gst_cacatv_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_cacatv_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
#define gst_cacatv_parent_class parent_class
G_DEFINE_TYPE (GstCACATv, gst_cacatv, GST_TYPE_VIDEO_FILTER);
#define GST_TYPE_CACADITHER (gst_cacatv_dither_get_type())
static GType
gst_cacatv_dither_get_type (void)
{
static GType dither_type = 0;
static const GEnumValue dither_types[] = {
{CACA_DITHERING_NONE, "No dither_mode", "none"},
{CACA_DITHERING_ORDERED2, "Ordered 2x2 Bayer dither_mode", "2x2"},
{CACA_DITHERING_ORDERED4, "Ordered 4x4 Bayer dither_mode", "4x4"},
{CACA_DITHERING_ORDERED8, "Ordered 8x8 Bayer dither_mode", "8x8"},
{CACA_DITHERING_RANDOM, "Random dither_mode", "random"},
{0, NULL, NULL},
};
if (!dither_type) {
dither_type = g_enum_register_static ("GstCACATvDithering", dither_types);
}
return dither_type;
}
static gboolean
gst_cacatv_setcaps (GstVideoFilter * filter, GstCaps * incaps,
GstVideoInfo * in_info, GstCaps * outcaps, GstVideoInfo * out_info)
{
GstCACATv *cacatv = GST_CACATV (filter);
GstVideoInfo info;
guint bpp, red_mask, green_mask, blue_mask, depth;
if (!gst_video_info_from_caps (&info, incaps))
goto caps_error;
cacatv->sink_width = GST_VIDEO_INFO_WIDTH (&info);
cacatv->sink_height = GST_VIDEO_INFO_HEIGHT (&info);
switch (GST_VIDEO_INFO_FORMAT (&info)) {
case GST_VIDEO_FORMAT_RGB:
case GST_VIDEO_FORMAT_BGR:
bpp = 8 * info.finfo->pixel_stride[0];
depth = 3;
red_mask = 0xff << (8 * info.finfo->poffset[GST_VIDEO_COMP_R]);
green_mask = 0xff << (8 * info.finfo->poffset[GST_VIDEO_COMP_G]);
blue_mask = 0xff << (8 * info.finfo->poffset[GST_VIDEO_COMP_B]);
break;
case GST_VIDEO_FORMAT_RGBA:
case GST_VIDEO_FORMAT_RGBx:
case GST_VIDEO_FORMAT_xRGB:
case GST_VIDEO_FORMAT_BGRx:
case GST_VIDEO_FORMAT_xBGR:
bpp = 8 * info.finfo->pixel_stride[0];
depth = 4;
red_mask = 0xff << (8 * info.finfo->poffset[GST_VIDEO_COMP_R]);
green_mask = 0xff << (8 * info.finfo->poffset[GST_VIDEO_COMP_G]);
blue_mask = 0xff << (8 * info.finfo->poffset[GST_VIDEO_COMP_B]);
break;
case GST_VIDEO_FORMAT_RGB16:
bpp = 16;
depth = 2;
red_mask = 0xf800;
green_mask = 0x07e0;
blue_mask = 0x001f;
break;
case GST_VIDEO_FORMAT_RGB15:
bpp = 16;
depth = 2;
red_mask = 0x7c00;
green_mask = 0x03e0;
blue_mask = 0x001f;
break;
default:
goto invalid_format;
}
/* free if already exists (there is no dither resize) */
caca_free_dither (cacatv->dither);
cacatv->dither =
caca_create_dither (bpp, cacatv->sink_width, cacatv->sink_height,
depth * cacatv->sink_width, red_mask, green_mask, blue_mask, 0x00000000);
caca_set_canvas_size (cacatv->canvas, cacatv->canvas_width,
cacatv->canvas_height);
return TRUE;
/* ERRORS */
caps_error:
{
GST_ERROR_OBJECT (cacatv, "error parsing caps");
return FALSE;
}
invalid_format:
{
GST_ERROR_OBJECT (cacatv, "invalid format");
return FALSE;
}
}
/* use a custom transform_caps */
static GstCaps *
gst_cacatv_transform_caps (GstBaseTransform * trans, GstPadDirection direction,
GstCaps * caps, GstCaps * filter)
{
GstCaps *ret;
GstCACATv *cacatv = GST_CACATV (trans);
GValue formats = G_VALUE_INIT;
GValue value = G_VALUE_INIT;
GValue src_width = G_VALUE_INIT;
GValue src_height = G_VALUE_INIT;
if (direction == GST_PAD_SINK) {
ret = gst_caps_copy (caps);
g_value_init (&src_width, G_TYPE_INT);
g_value_init (&src_height, G_TYPE_INT);
/* calculate output resolution from canvas size and font size */
cacatv->src_width =
cacatv->canvas_width * caca_get_font_width (cacatv->font);
cacatv->src_height =
cacatv->canvas_height * caca_get_font_height (cacatv->font);
g_value_set_int (&src_width, cacatv->src_width);
g_value_set_int (&src_height, cacatv->src_height);
gst_caps_set_value (ret, "width", &src_width);
gst_caps_set_value (ret, "height", &src_height);
/* force ARGB output format */
g_value_init (&formats, GST_TYPE_LIST);
g_value_init (&value, G_TYPE_STRING);
g_value_set_string (&value, "ARGB");
gst_value_list_append_value (&formats, &value);
gst_caps_set_value (ret, "format", &formats);
} else {
ret = gst_static_pad_template_get_caps (&sink_template);
}
return ret;
}
static void
gst_cacatv_finalize (GObject * object)
{
GstCACATv *cacatv = GST_CACATV (object);
caca_free_font (cacatv->font);
caca_free_dither (cacatv->dither);
caca_free_canvas (cacatv->canvas);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_cacatv_class_init (GstCACATvClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstVideoFilterClass *videofilter_class;
GstBaseTransformClass *transform_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
videofilter_class = (GstVideoFilterClass *) klass;
transform_class = (GstBaseTransformClass *) klass;
gobject_class->set_property = gst_cacatv_set_property;
gobject_class->get_property = gst_cacatv_get_property;
gobject_class->finalize = gst_cacatv_finalize;
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_CANVAS_WIDTH,
g_param_spec_int ("canvas-width", "Canvas Width",
"The width of the canvas in characters", 0, G_MAXINT,
GST_CACA_DEFAULT_SCREEN_WIDTH,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_CANVAS_HEIGHT,
g_param_spec_int ("canvas-height", "Canvas Height",
"The height of the canvas in characters", 0, G_MAXINT,
GST_CACA_DEFAULT_SCREEN_HEIGHT,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_FONT,
g_param_spec_int ("font", "Font", "selected libcaca font", 0, G_MAXINT,
GST_CACA_DEFAULT_SCREEN_HEIGHT,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_DITHER,
g_param_spec_enum ("dither", "Dither Type", "Set type of Dither",
GST_TYPE_CACADITHER, GST_CACA_DEFAULT_DITHER,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_ANTIALIASING,
g_param_spec_boolean ("anti-aliasing", "Anti Aliasing",
"Enables Anti-Aliasing", GST_CACA_DEFAULT_ANTIALIASING,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_set_static_metadata (gstelement_class,
"CacaTV effect", "Filter/Effect/Video",
"Colored ASCII art effect", "Eric Marks <bigmarkslp@gmail.com>");
gst_element_class_add_static_pad_template (gstelement_class, &sink_template);
gst_element_class_add_static_pad_template (gstelement_class, &src_template);
videofilter_class->transform_frame =
GST_DEBUG_FUNCPTR (gst_cacatv_transform_frame);
videofilter_class->set_info = GST_DEBUG_FUNCPTR (gst_cacatv_setcaps);
transform_class->transform_caps =
GST_DEBUG_FUNCPTR (gst_cacatv_transform_caps);
gst_type_mark_as_plugin_api (GST_TYPE_CACADITHER, 0);
}
static void
gst_cacatv_init (GstCACATv * cacatv)
{
char const *const *fonts = caca_get_font_list ();
cacatv->font_index = GST_CACA_DEFAULT_FONT;
cacatv->font = caca_load_font (fonts[cacatv->font_index], 0);
cacatv->canvas_width = GST_CACA_DEFAULT_SCREEN_WIDTH;
cacatv->canvas_height = GST_CACA_DEFAULT_SCREEN_HEIGHT;
cacatv->canvas =
caca_create_canvas (cacatv->canvas_width, cacatv->canvas_height);
cacatv->antialiasing = FALSE;
caca_set_feature (CACA_ANTIALIASING_MIN);
cacatv->dither_mode = 0;
caca_set_dithering (CACA_DITHERING_NONE);
}
static void
gst_cacatv_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstCACATv *cacatv = GST_CACATV (object);
switch (prop_id) {
case PROP_DITHER:{
cacatv->dither_mode = g_value_get_enum (value);
caca_set_dithering (cacatv->dither_mode + CACA_DITHERING_NONE);
break;
}
case PROP_ANTIALIASING:{
cacatv->antialiasing = g_value_get_boolean (value);
if (cacatv->antialiasing) {
caca_set_feature (CACA_ANTIALIASING_MAX);
} else {
caca_set_feature (CACA_ANTIALIASING_MIN);
}
break;
}
case PROP_CANVAS_WIDTH:{
cacatv->canvas_width = g_value_get_int (value);
/* recalculate output resolution based on new width */
gst_pad_mark_reconfigure (GST_BASE_TRANSFORM_SRC_PAD (object));
break;
}
case PROP_CANVAS_HEIGHT:{
cacatv->canvas_height = g_value_get_int (value);
/* recalculate output resolution based on new height */
gst_pad_mark_reconfigure (GST_BASE_TRANSFORM_SRC_PAD (object));
break;
}
case PROP_FONT:{
char const *const *fonts = caca_get_font_list ();
cacatv->font_index = g_value_get_int (value);
caca_free_font (cacatv->font);
cacatv->font = caca_load_font (fonts[cacatv->font_index], 0);
/* recalculate output resolution based on new font */
gst_pad_mark_reconfigure (GST_BASE_TRANSFORM_SRC_PAD (object));
break;
}
default:
break;
}
}
static void
gst_cacatv_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstCACATv *cacatv = GST_CACATV (object);
switch (prop_id) {
case PROP_CANVAS_WIDTH:{
g_value_set_int (value, cacatv->canvas_width);
break;
}
case PROP_CANVAS_HEIGHT:{
g_value_set_int (value, cacatv->canvas_height);
break;
}
case PROP_DITHER:{
g_value_set_enum (value, cacatv->dither_mode);
break;
}
case PROP_ANTIALIASING:{
g_value_set_boolean (value, cacatv->antialiasing);
break;
}
case PROP_FONT:{
g_value_set_int (value, cacatv->font_index);
break;
}
default:{
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
}