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basescope: add a property to modify the ammount of shading

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Add another property to specify the shading per color channel. Fix endianess
issues in the shading code.

https://bugzilla.gnome.org/show_bug.cgi?id=651536
This commit is contained in:
Stefan Kost 2011-05-28 14:08:05 +03:00
parent 2cd10856d0
commit efe9f3328d
2 changed files with 84 additions and 9 deletions
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92
gst/scopes/gstbasescope.c
View file

@ -34,14 +34,16 @@
GST_DEBUG_CATEGORY_STATIC (base_scope_debug);
#define GST_CAT_DEFAULT (base_scope_debug)
#define DEFAULT_SHADER GST_BASE_SCOPE_SHADER_FADE
#define DEFAULT_SHADE_AMOUNT 0x000a0a0a
enum
{
PROP_0,
PROP_SHADER
PROP_SHADER,
PROP_SHADE_AMOUNT
};
#define DEFAULT_SHADER GST_BASE_SCOPE_SHADER_FADE
static GstBaseTransformClass *parent_class = NULL;
static void gst_base_scope_class_init (GstBaseScopeClass * klass);
@ -86,10 +88,32 @@ static void
shader_fade (GstBaseScope * scope, const guint8 * s, guint8 * d)
{
guint i, bpf = scope->bpf;
guint r = (scope->shade_amount >> 16) & 0xff;
guint g = (scope->shade_amount >> 8) & 0xff;
guint b = (scope->shade_amount >> 0) & 0xff;
for (i = 0; i < bpf; i++) {
d[i] = (s[i] > 10) ? s[i] - 10 : 0;
/* we're only supporting GST_VIDEO_FORMAT_xRGB right now) */
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
for (i = 0; i < bpf;) {
d[i] = (s[i] > b) ? s[i] - b : 0;
i++;
d[i] = (s[i] > g) ? s[i] - g : 0;
i++;
d[i] = (s[i] > r) ? s[i] - r : 0;
i++;
d[i++] = 0;
}
#else
for (i = 0; i < bpf;) {
d[i++] = 0;
d[i] = (s[i] > r) ? s[i] - r : 0;
i++;
d[i] = (s[i] > g) ? s[i] - g : 0;
i++;
d[i] = (s[i] > b) ? s[i] - b : 0;
i++;
}
#endif
}
static void
@ -97,13 +121,51 @@ shader_fade_and_move_up (GstBaseScope * scope, const guint8 * s, guint8 * d)
{
guint i, j, bpf = scope->bpf;
guint bpl = 4 * scope->width;
guint r = (scope->shade_amount >> 16) & 0xff;
guint g = (scope->shade_amount >> 8) & 0xff;
guint b = (scope->shade_amount >> 0) & 0xff;
for (j = 0, i = bpl; i < bpf; i++, j++) {
d[j] = (s[i] > 10) ? s[i] - 10 : 0;
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
for (j = 0, i = bpl; i < bpf;) {
d[j++] = (s[i] > b) ? s[i] - b : 0;
i++;
d[j++] = (s[i] > g) ? s[i] - g : 0;
i++;
d[j++] = (s[i] > r) ? s[i] - r : 0;
i++;
d[j++] = 0;
i++;
}
for (i = 0; i < bpl; i++, j++) {
d[j] = (s[j] > 10) ? s[j] - 10 : 0;
for (i = 0; i < bpl; i += 4) {
d[j] = (s[j] > b) ? s[j] - b : 0;
j++;
d[j] = (s[j] > g) ? s[j] - g : 0;
j++;
d[j] = (s[j] > r) ? s[j] - r : 0;
j++;
d[j++] = 0;
}
#else
for (j = 0, i = bpl; i < bpf;) {
d[j++] = 0;
i++;
d[j++] = (s[i] > r) ? s[i] - r : 0;
i++;
d[j++] = (s[i] > g) ? s[i] - g : 0;
i++;
d[j++] = (s[i] > b) ? s[i] - b : 0;
i++;
}
for (i = 0; i < bpl; i += 4) {
d[j++] = 0;
d[j] = (s[j] > r) ? s[j] - r : 0;
j++;
d[j] = (s[j] > g) ? s[j] - g : 0;
j++;
d[j] = (s[j] > b) ? s[j] - b : 0;
j++;
}
#endif
}
static void
@ -176,6 +238,11 @@ gst_base_scope_class_init (GstBaseScopeClass * klass)
"Shader function to apply on each frame", GST_TYPE_BASE_SCOPE_SHADER,
DEFAULT_SHADER,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_SHADE_AMOUNT,
g_param_spec_uint ("shade-amount", "shade amount",
"Shading color to use (big-endian ARGB)", 0, G_MAXUINT32,
DEFAULT_SHADE_AMOUNT,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
}
static void
@ -208,6 +275,7 @@ gst_base_scope_init (GstBaseScope * scope, GstBaseScopeClass * g_class)
/* properties */
scope->shader_type = DEFAULT_SHADER;
gst_base_scope_change_shader (scope);
scope->shade_amount = DEFAULT_SHADE_AMOUNT;
/* reset the initial video state */
scope->width = 320;
@ -235,6 +303,9 @@ gst_base_scope_set_property (GObject * object, guint prop_id,
scope->shader_type = g_value_get_enum (value);
gst_base_scope_change_shader (scope);
break;
case PROP_SHADE_AMOUNT:
scope->shade_amount = g_value_get_uint (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -251,6 +322,9 @@ gst_base_scope_get_property (GObject * object, guint prop_id,
case PROP_SHADER:
g_value_set_enum (value, scope->shader_type);
break;
case PROP_SHADE_AMOUNT:
g_value_set_uint (value, scope->shade_amount);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;

1
gst/scopes/gstbasescope.h
View file

@ -66,6 +66,7 @@ struct _GstBaseScope
GstBaseScopeShader shader_type;
GstBaseScopeShaderFunc shader;
guint32 shade_amount;
guint64 next_ts; /* the timestamp of the next frame */
guint64 frame_duration;