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textoverlay: optionally scale text to ensure proper display text aspect ratio

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... by prescaling with an inverse aspect scaling as applied by video scaling
This commit is contained in:
Mark Nauwelaerts 2017-05-21 12:34:08 +02:00
parent df160d1989
commit 6d6a6bc3d8
2 changed files with 154 additions and 16 deletions
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150
ext/pango/gstbasetextoverlay.c
View file

@ -63,6 +63,9 @@ GST_DEBUG_CATEGORY (pango_debug);
#define DEFAULT_PROP_WAIT_TEXT TRUE
#define DEFAULT_PROP_AUTO_ADJUST_SIZE TRUE
#define DEFAULT_PROP_VERTICAL_RENDER FALSE
#define DEFAULT_PROP_SCALE_MODE GST_BASE_TEXT_OVERLAY_SCALE_MODE_NONE
#define DEFAULT_PROP_SCALE_PAR_N 1
#define DEFAULT_PROP_SCALE_PAR_D 1
#define DEFAULT_PROP_DRAW_SHADOW TRUE
#define DEFAULT_PROP_DRAW_OUTLINE TRUE
#define DEFAULT_PROP_COLOR 0xffffffff
@ -99,6 +102,8 @@ enum
PROP_WAIT_TEXT,
PROP_AUTO_ADJUST_SIZE,
PROP_VERTICAL_RENDER,
PROP_SCALE_MODE,
PROP_SCALE_PAR,
PROP_COLOR,
PROP_DRAW_SHADOW,
PROP_DRAW_OUTLINE,
@ -223,6 +228,27 @@ gst_base_text_overlay_line_align_get_type (void)
return base_text_overlay_line_align_type;
}
#define GST_TYPE_BASE_TEXT_OVERLAY_SCALE_MODE (gst_base_text_overlay_scale_mode_get_type())
static GType
gst_base_text_overlay_scale_mode_get_type (void)
{
static GType base_text_overlay_scale_mode_type = 0;
static const GEnumValue base_text_overlay_scale_mode[] = {
{GST_BASE_TEXT_OVERLAY_SCALE_MODE_NONE, "none", "none"},
{GST_BASE_TEXT_OVERLAY_SCALE_MODE_PAR, "par", "par"},
{GST_BASE_TEXT_OVERLAY_SCALE_MODE_DISPLAY, "display", "display"},
{GST_BASE_TEXT_OVERLAY_SCALE_MODE_USER, "user", "user"},
{0, NULL, NULL}
};
if (!base_text_overlay_scale_mode_type) {
base_text_overlay_scale_mode_type =
g_enum_register_static ("GstBaseTextOverlayScaleMode",
base_text_overlay_scale_mode);
}
return base_text_overlay_scale_mode_type;
}
#define GST_BASE_TEXT_OVERLAY_GET_LOCK(ov) (&GST_BASE_TEXT_OVERLAY (ov)->lock)
#define GST_BASE_TEXT_OVERLAY_GET_COND(ov) (&GST_BASE_TEXT_OVERLAY (ov)->cond)
#define GST_BASE_TEXT_OVERLAY_LOCK(ov) (g_mutex_lock (GST_BASE_TEXT_OVERLAY_GET_LOCK (ov)))
@ -600,6 +626,33 @@ gst_base_text_overlay_class_init (GstBaseTextOverlayClass * klass)
g_param_spec_boolean ("vertical-render", "vertical render",
"Vertical Render.", DEFAULT_PROP_VERTICAL_RENDER,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstBaseTextOverlay:scale-mode:
*
* Scale text to compensate for and avoid distortion by subsequent video scaling
*
* Since: 1.14
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SCALE_MODE,
g_param_spec_enum ("scale-mode", "scale mode",
"Scale text to compensate for and avoid distortion by subsequent video scaling.",
GST_TYPE_BASE_TEXT_OVERLAY_SCALE_MODE, DEFAULT_PROP_SCALE_MODE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstBaseTextOverlay:scale-pixel-aspect-ratio:
*
* Video scaling pixel-aspect-ratio to compensate for in user scale-mode.
*
* Since: 1.14
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SCALE_PAR,
gst_param_spec_fraction ("scale-pixel-aspect-ratio",
"scale pixel aspect ratio",
"Pixel aspect ratio of video scale to compensate for in user scale-mode",
1, 100, 100, 1, DEFAULT_PROP_SCALE_PAR_N, DEFAULT_PROP_SCALE_PAR_D,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}
static void
@ -717,6 +770,9 @@ gst_base_text_overlay_init (GstBaseTextOverlay * overlay,
overlay->need_render = TRUE;
overlay->text_image = NULL;
overlay->use_vertical_render = DEFAULT_PROP_VERTICAL_RENDER;
overlay->scale_mode = DEFAULT_PROP_SCALE_MODE;
overlay->scale_par_n = DEFAULT_PROP_SCALE_PAR_N;
overlay->scale_par_d = DEFAULT_PROP_SCALE_PAR_D;
overlay->line_align = DEFAULT_PROP_LINE_ALIGNMENT;
pango_layout_set_alignment (overlay->layout,
@ -1099,6 +1155,13 @@ gst_base_text_overlay_set_property (GObject * object, guint prop_id,
g_mutex_unlock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
}
break;
case PROP_SCALE_MODE:
overlay->scale_mode = g_value_get_enum (value);
break;
case PROP_SCALE_PAR:
overlay->scale_par_n = gst_value_get_fraction_numerator (value);
overlay->scale_par_d = gst_value_get_fraction_denominator (value);
break;
case PROP_SHADING_VALUE:
overlay->shading_value = g_value_get_uint (value);
break;
@ -1179,6 +1242,13 @@ gst_base_text_overlay_get_property (GObject * object, guint prop_id,
case PROP_VERTICAL_RENDER:
g_value_set_boolean (value, overlay->use_vertical_render);
break;
case PROP_SCALE_MODE:
g_value_set_enum (value, overlay->scale_mode);
break;
case PROP_SCALE_PAR:
gst_value_set_fraction (value, overlay->scale_par_n,
overlay->scale_par_d);
break;
case PROP_COLOR:
g_value_set_uint (value, overlay->color);
break;
@ -1677,7 +1747,7 @@ gst_base_text_overlay_render_pangocairo (GstBaseTextOverlay * overlay,
gint unscaled_width, unscaled_height;
gint width, height;
gboolean full_width = FALSE;
double scalef = 1.0;
double scalef_x = 1.0, scalef_y = 1.0;
double a, r, g, b;
gdouble shadow_offset = 0.0;
gdouble outline_offset = 0.0;
@ -1689,7 +1759,44 @@ gst_base_text_overlay_render_pangocairo (GstBaseTextOverlay * overlay,
if (overlay->auto_adjust_size) {
/* 640 pixel is default */
scalef = (double) (overlay->width) / DEFAULT_SCALE_BASIS;
scalef_x = scalef_y = (double) (overlay->width) / DEFAULT_SCALE_BASIS;
}
if (overlay->scale_mode != GST_BASE_TEXT_OVERLAY_SCALE_MODE_NONE) {
gint par_n = 1, par_d = 1;
switch (overlay->scale_mode) {
case GST_BASE_TEXT_OVERLAY_SCALE_MODE_PAR:
par_n = overlay->info.par_n;
par_d = overlay->info.par_d;
break;
case GST_BASE_TEXT_OVERLAY_SCALE_MODE_DISPLAY:
/* (width * par_n) / (height * par_d) = (display_w / display_h) */
gst_util_fraction_multiply (overlay->window_width,
overlay->window_height, overlay->height, overlay->width,
&par_n, &par_d);
break;
case GST_BASE_TEXT_OVERLAY_SCALE_MODE_USER:
par_n = overlay->scale_par_n;
par_d = overlay->scale_par_d;
break;
default:
break;
}
/* sanitize */
if (!par_n || !par_d)
par_n = par_d = 1;
/* compensate later scaling as would be done for a par_n / par_d p-a-r;
* apply all scaling to y so as to allow for predictable text width
* layout independent of the presentation aspect scaling */
if (overlay->use_vertical_render) {
scalef_y *= ((gdouble) par_d) / ((gdouble) par_n);
} else {
scalef_y *= ((gdouble) par_n) / ((gdouble) par_d);
}
GST_DEBUG_OBJECT (overlay,
"compensate scaling mode %d par %d/%d, scale %f, %f",
overlay->scale_mode, par_n, par_d, scalef_x, scalef_y);
}
if (overlay->draw_shadow)
@ -1716,7 +1823,7 @@ gst_base_text_overlay_render_pangocairo (GstBaseTextOverlay * overlay,
pango_layout_get_pixel_extents (overlay->layout, &ink_rect, &logical_rect);
unscaled_width = ink_rect.width + shadow_offset + outline_offset;
width = ceil (unscaled_width * scalef);
width = ceil (unscaled_width * scalef_x);
/*
* subtitle image width can be larger then overlay width
@ -1733,26 +1840,26 @@ gst_base_text_overlay_render_pangocairo (GstBaseTextOverlay * overlay,
}
if (full_width) {
unscaled_width = width / scalef;
unscaled_width = width / scalef_x;
gst_base_text_overlay_set_wrap_mode (overlay,
unscaled_width - shadow_offset - outline_offset);
pango_layout_get_pixel_extents (overlay->layout, &ink_rect, &logical_rect);
unscaled_width = ink_rect.width + shadow_offset + outline_offset;
width = ceil (unscaled_width * scalef);
width = ceil (unscaled_width * scalef_x);
}
unscaled_height = ink_rect.height + shadow_offset + outline_offset;
height = ceil (unscaled_height * scalef);
height = ceil (unscaled_height * scalef_y);
if (overlay->use_vertical_render) {
if (height + xpad > overlay->width) {
height = overlay->width - xpad;
unscaled_height = width / scalef;
unscaled_height = width / scalef_y;
}
} else if (height + ypad > overlay->height) {
height = overlay->height - ypad;
unscaled_height = height / scalef;
unscaled_height = height / scalef_y;
}
GST_DEBUG_OBJECT (overlay, "Rendering with ink rect (%d, %d) %dx%d and "
@ -1766,20 +1873,20 @@ gst_base_text_overlay_render_pangocairo (GstBaseTextOverlay * overlay,
/* Save and scale the rectangles so get_pos() can place the text */
overlay->ink_rect.x =
ceil ((ink_rect.x - ceil (outline_offset / 2.0l)) * scalef);
ceil ((ink_rect.x - ceil (outline_offset / 2.0l)) * scalef_x);
overlay->ink_rect.y =
ceil ((ink_rect.y - ceil (outline_offset / 2.0l)) * scalef);
ceil ((ink_rect.y - ceil (outline_offset / 2.0l)) * scalef_y);
overlay->ink_rect.width = width;
overlay->ink_rect.height = height;
overlay->logical_rect.x =
ceil ((logical_rect.x - ceil (outline_offset / 2.0l)) * scalef);
ceil ((logical_rect.x - ceil (outline_offset / 2.0l)) * scalef_x);
overlay->logical_rect.y =
ceil ((logical_rect.y - ceil (outline_offset / 2.0l)) * scalef);
ceil ((logical_rect.y - ceil (outline_offset / 2.0l)) * scalef_y);
overlay->logical_rect.width =
ceil ((logical_rect.width + shadow_offset + outline_offset) * scalef);
ceil ((logical_rect.width + shadow_offset + outline_offset) * scalef_x);
overlay->logical_rect.height =
ceil ((logical_rect.height + shadow_offset + outline_offset) * scalef);
ceil ((logical_rect.height + shadow_offset + outline_offset) * scalef_y);
/* flip the rectangle if doing vertical render */
if (overlay->use_vertical_render) {
@ -1803,7 +1910,8 @@ gst_base_text_overlay_render_pangocairo (GstBaseTextOverlay * overlay,
/* scale to reported window size */
width = ceil (width * overlay->render_scale);
height = ceil (height * overlay->render_scale);
scalef *= overlay->render_scale;
scalef_x *= overlay->render_scale;
scalef_y *= overlay->render_scale;
if (width <= 0 || height <= 0) {
g_mutex_unlock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
@ -1821,7 +1929,17 @@ gst_base_text_overlay_render_pangocairo (GstBaseTextOverlay * overlay,
/* Prepare the transformation matrix. Note that the transformation happens
* in reverse order. So for horizontal text, we will translate and then
* scale. This is important to understand which scale shall be used. */
cairo_matrix_init_scale (&cairo_matrix, scalef, scalef);
/* So, as this init'ed scale happens last, when the rectangle has already
* been rotated, the scaling applied to text height (up to now),
* has to be applied along the x-axis */
if (overlay->use_vertical_render) {
double tmp;
tmp = scalef_x;
scalef_x = scalef_y;
scalef_y = tmp;
}
cairo_matrix_init_scale (&cairo_matrix, scalef_x, scalef_y);
if (overlay->use_vertical_render) {
gint tmp;

20
ext/pango/gstbasetextoverlay.h
View file

@ -115,6 +115,23 @@ typedef enum {
GST_BASE_TEXT_OVERLAY_LINE_ALIGN_RIGHT = PANGO_ALIGN_RIGHT
} GstBaseTextOverlayLineAlign;
/**
* GstBaseTextOverlayScaleMode:
* @GST_BASE_TEXT_OVERLAY_SCALE_MODE_NONE: no compensation
* @GST_BASE_TEXT_OVERLAY_SCALE_MODE_PAR: compensate pixel-aspect-ratio scaling
* @GST_BASE_TEXT_OVERLAY_SCALE_MODE_DISPLAY: compensate for scaling to display (as determined by overlay allocation meta)
* @GST_BASE_TEXT_OVERLAY_SCALE_MODE_USER: compensate scaling set by #GstBaseTextOverlay:scale-pixel-aspect-ratio property
*
* Scale text to compensate for and avoid aspect distortion by subsequent
* scaling of video
*/
typedef enum {
GST_BASE_TEXT_OVERLAY_SCALE_MODE_NONE,
GST_BASE_TEXT_OVERLAY_SCALE_MODE_PAR,
GST_BASE_TEXT_OVERLAY_SCALE_MODE_DISPLAY,
GST_BASE_TEXT_OVERLAY_SCALE_MODE_USER
} GstBaseTextOverlayScaleMode;
/**
* GstBaseTextOverlay:
*
@ -170,6 +187,9 @@ struct _GstBaseTextOverlay {
GstBaseTextOverlayHAlign halign;
GstBaseTextOverlayWrapMode wrap_mode;
GstBaseTextOverlayLineAlign line_align;
GstBaseTextOverlayScaleMode scale_mode;
gint scale_par_n;
gint scale_par_d;
/* text pad format */
gboolean have_pango_markup;