mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-09-24 13:00:36 +00:00
607 lines
17 KiB
C
607 lines
17 KiB
C
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <gst/gst.h>
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#include "gsttextoverlay.h"
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//#include "gsttexttestsrc.h"
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//#include "gstsubparse.h"
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//#include "SDL_blit.h"
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static GstElementDetails textoverlay_details = {
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"Text Overlay",
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"Filter/Video",
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"LGPL",
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"Adds text strings on top of a video buffer",
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VERSION,
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"Gustavo J. A. M. Carneiro <gjc@inescporto.pt>",
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"(C) 2003",
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};
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enum {
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ARG_0,
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ARG_TEXT,
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ARG_VALIGN,
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ARG_HALIGN,
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ARG_X0,
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ARG_Y0,
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ARG_FONT_DESC,
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};
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GST_PAD_TEMPLATE_FACTORY(textoverlay_src_template_factory,
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"src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_CAPS_NEW(
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"textoverlay_src",
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"video/raw",
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"format", GST_PROPS_LIST(
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GST_PROPS_FOURCC(GST_STR_FOURCC("I420"))
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),
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"width", GST_PROPS_INT_RANGE(0, G_MAXINT),
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"height", GST_PROPS_INT_RANGE(0, G_MAXINT)
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)
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)
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GST_PAD_TEMPLATE_FACTORY(video_sink_template_factory,
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"video_sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_CAPS_NEW(
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"video_sink",
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"video/raw",
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"format", GST_PROPS_LIST(
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GST_PROPS_FOURCC(GST_STR_FOURCC("I420"))
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),
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"width", GST_PROPS_INT_RANGE(0, G_MAXINT),
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"height", GST_PROPS_INT_RANGE(0, G_MAXINT)
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)
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)
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GST_PAD_TEMPLATE_FACTORY(text_sink_template_factory,
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"text_sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_CAPS_NEW(
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"text_sink",
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"text/x-pango-markup",
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NULL
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)
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)
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static void gst_textoverlay_class_init(GstTextOverlayClass *klass);
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static void gst_textoverlay_init(GstTextOverlay *overlay);
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static void gst_textoverlay_set_property(GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec);
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static void gst_textoverlay_get_property(GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec);
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static GstElementStateReturn gst_textoverlay_change_state(GstElement *element);
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static void gst_textoverlay_finalize(GObject *object);
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static GstElementClass *parent_class = NULL;
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/*static guint gst_textoverlay_signals[LAST_SIGNAL] = { 0 }; */
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GType
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gst_textoverlay_get_type(void)
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{
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static GType textoverlay_type = 0;
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if (!textoverlay_type) {
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static const GTypeInfo textoverlay_info = {
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sizeof(GstTextOverlayClass),
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NULL,
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NULL,
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(GClassInitFunc)gst_textoverlay_class_init,
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NULL,
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NULL,
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sizeof(GstTextOverlay),
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0,
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(GInstanceInitFunc)gst_textoverlay_init,
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};
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textoverlay_type = g_type_register_static(GST_TYPE_ELEMENT, "GstTextOverlay",
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&textoverlay_info, 0);
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}
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return textoverlay_type;
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}
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static void
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gst_textoverlay_class_init(GstTextOverlayClass *klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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gobject_class = (GObjectClass*)klass;
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gstelement_class = (GstElementClass*)klass;
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parent_class = g_type_class_peek_parent(klass);
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gobject_class->finalize = gst_textoverlay_finalize;
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gobject_class->set_property = gst_textoverlay_set_property;
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gobject_class->get_property = gst_textoverlay_get_property;
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gstelement_class->change_state = gst_textoverlay_change_state;
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klass->pango_context = pango_ft2_get_context(72, 72);
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g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_TEXT,
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g_param_spec_string("text", "text",
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"Text to be display,"
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" in pango markup format.",
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"", G_PARAM_WRITABLE));
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g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_VALIGN,
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g_param_spec_string("valign", "vertical alignment",
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"Vertical alignment of the text. "
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"Can be either 'baseline', 'bottom', or 'top'",
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"baseline", G_PARAM_WRITABLE));
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g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_HALIGN,
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g_param_spec_string("halign", "horizontal alignment",
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"Horizontal alignment of the text. "
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"Can be either 'left', 'right', or 'center'",
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"center", G_PARAM_WRITABLE));
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g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_X0,
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g_param_spec_int("x0", "X position",
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"Initial X position."
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" Horizontal aligment takes this point"
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" as reference.",
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G_MININT, G_MAXINT, 0, G_PARAM_WRITABLE));
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g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_Y0,
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g_param_spec_int("y0", "Y position",
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"Initial Y position."
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" Vertical aligment takes this point"
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" as reference.",
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G_MININT, G_MAXINT, 0, G_PARAM_WRITABLE));
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g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_FONT_DESC,
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g_param_spec_string("font-desc", "font description",
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"Pango font description of font "
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"to be used for rendering. "
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"See documentation of "
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"pango_font_description_from_string"
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" for syntax.",
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"", G_PARAM_WRITABLE));
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}
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static void
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resize_bitmap(GstTextOverlay *overlay, int width, int height)
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{
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FT_Bitmap *bitmap = &overlay->bitmap;
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int pitch = (width|3) + 1;
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int size = pitch*height;
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/* no need to keep reallocating; just keep the maximum size so far */
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if (size <= overlay->bitmap_buffer_size) {
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bitmap->rows = height;
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bitmap->width = width;
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bitmap->pitch = pitch;
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memset(bitmap->buffer, 0, overlay->bitmap_buffer_size);
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return;
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}
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if (!bitmap->buffer) {
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/* initialize */
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bitmap->pixel_mode = ft_pixel_mode_grays;
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bitmap->num_grays = 256;
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}
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if (bitmap->buffer)
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bitmap->buffer = g_realloc(bitmap->buffer, size);
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else
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bitmap->buffer = g_malloc(size);
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bitmap->rows = height;
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bitmap->width = width;
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bitmap->pitch = pitch;
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memset(bitmap->buffer, 0, size);
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overlay->bitmap_buffer_size = size;
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}
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static void
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render_text(GstTextOverlay *overlay)
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{
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PangoRectangle ink_rect, logical_rect;
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pango_layout_get_pixel_extents(overlay->layout, &ink_rect, &logical_rect);
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resize_bitmap(overlay, ink_rect.width, ink_rect.height + ink_rect.y);
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pango_ft2_render_layout(&overlay->bitmap, overlay->layout, 0, 0);
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overlay->baseline_y = ink_rect.y;
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}
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/* static GstPadLinkReturn */
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/* gst_textoverlay_text_sinkconnect (GstPad *pad, GstCaps *caps) */
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/* { */
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/* return GST_PAD_LINK_DONE; */
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/* } */
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static GstPadLinkReturn
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gst_textoverlay_video_sinkconnect(GstPad *pad, GstCaps *caps)
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{
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GstTextOverlay *overlay;
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overlay = GST_TEXTOVERLAY(gst_pad_get_parent(pad));
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if (!GST_CAPS_IS_FIXED(caps))
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return GST_PAD_LINK_DELAYED;
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overlay->width = overlay->height = 0;
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gst_caps_get_int(caps, "width", &overlay->width);
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gst_caps_get_int(caps, "height", &overlay->height);
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return gst_pad_try_set_caps(overlay->srcpad, caps);
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}
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static void
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gst_text_overlay_blit_yuv420(GstTextOverlay *overlay, FT_Bitmap *bitmap,
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guchar *pixbuf, int x0, int y0)
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{
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int y; /* text bitmap coordinates */
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int x1, y1; /* video buffer coordinates */
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int rowinc, bit_rowinc, uv_rowinc;
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guchar *p, *bitp, *u_p;
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int video_width = overlay->width, video_height = overlay->height;
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int bitmap_x0 = x0 < 1? -(x0 - 1) : 1; /* 1 pixel border */
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int bitmap_y0 = y0 < 1? -(y0 - 1) : 1; /* 1 pixel border */
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int bitmap_width = bitmap->width - bitmap_x0;
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int bitmap_height = bitmap->rows - bitmap_y0;
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int u_plane_size;
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int skip_y, skip_x;
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guchar v;
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if (x0 + bitmap_x0 + bitmap_width > video_width - 1) /* 1 pixel border */
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bitmap_width -= x0 + bitmap_x0 + bitmap_width - video_width + 1;
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if (y0 + bitmap_y0 + bitmap_height > video_height - 1) /* 1 pixel border */
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bitmap_height -= y0 + bitmap_y0 + bitmap_height - video_height + 1;
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rowinc = video_width - bitmap_width;
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uv_rowinc = video_width / 2 - bitmap_width / 2;
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bit_rowinc = bitmap->pitch - bitmap_width;
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u_plane_size = (video_width / 2)*(video_height / 2);
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y1 = y0 + bitmap_y0;
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x1 = x0 + bitmap_x0;
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p = pixbuf + video_width*y1 + x1;
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bitp = bitmap->buffer + bitmap->pitch*bitmap_y0 + bitmap_x0;
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for (y = bitmap_y0; y < bitmap_height; y++){
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int n;
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for(n=bitmap_width; n>0; --n){
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v = *bitp;
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if (v) {
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p[-1] = 0;
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p[ 1] = 0;
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p[-video_width] = 0;
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p[ video_width] = 0;
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}
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p++;
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bitp++;
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}
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p += rowinc;
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bitp += bit_rowinc;
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}
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y = bitmap_y0;
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y1 = y0 + bitmap_y0;
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x1 = x0 + bitmap_x0;
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bitp = bitmap->buffer + bitmap->pitch*bitmap_y0 + bitmap_x0;
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p = pixbuf + video_width*y1 + x1;
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u_p = pixbuf + video_width*video_height + (video_width >> 1)*(y1 >> 1) + (x1 >> 1);
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skip_y = 0;
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skip_x = 0;
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for ( ; y < bitmap_height; y++){
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int n;
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x1 = x0 + bitmap_x0;
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skip_x = 0;
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for(n = bitmap_width; n>0; --n){
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v = *bitp;
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if (v) {
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*p = v;
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if (!skip_y) {
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u_p[0] = u_p[u_plane_size] = 0x80;
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}
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}
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if (!skip_y) {
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skip_x = !skip_x;
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if (!skip_x) u_p++;
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}
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p++;
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bitp++;
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}
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/*if (!skip_x && !skip_y) u_p--; */
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p += rowinc;
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bitp += bit_rowinc;
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skip_y = !skip_y;
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u_p += skip_y? uv_rowinc : 0;
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}
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}
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static void
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gst_textoverlay_video_chain(GstPad *pad, GstBuffer *buf)
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{
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GstTextOverlay *overlay;
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guchar *pixbuf;
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gint x0, y0;
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g_return_if_fail(pad != NULL);
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g_return_if_fail(GST_IS_PAD(pad));
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g_return_if_fail(buf != NULL);
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overlay = GST_TEXTOVERLAY(gst_pad_get_parent(pad));
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g_return_if_fail(overlay != NULL);
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g_return_if_fail(GST_IS_TEXTOVERLAY(overlay));
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pixbuf = GST_BUFFER_DATA(buf);
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x0 = overlay->x0;
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y0 = overlay->y0;
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switch (overlay->valign)
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{
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case GST_TEXT_OVERLAY_VALIGN_BOTTOM:
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y0 += overlay->bitmap.rows;
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break;
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case GST_TEXT_OVERLAY_VALIGN_BASELINE:
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y0 -= (overlay->bitmap.rows - overlay->baseline_y);
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break;
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case GST_TEXT_OVERLAY_VALIGN_TOP:
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break;
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}
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switch (overlay->halign)
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{
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case GST_TEXT_OVERLAY_HALIGN_LEFT:
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break;
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case GST_TEXT_OVERLAY_HALIGN_RIGHT:
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x0 -= overlay->bitmap.width;
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break;
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case GST_TEXT_OVERLAY_HALIGN_CENTER:
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x0 -= overlay->bitmap.width / 2;
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break;
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}
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if (overlay->bitmap.buffer)
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gst_text_overlay_blit_yuv420(overlay, &overlay->bitmap, pixbuf, x0, y0);
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gst_pad_push(overlay->srcpad, buf);
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}
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static void
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gst_textoverlay_loop(GstElement *element)
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{
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GstTextOverlay *overlay;
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GstBuffer *video_frame;
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GstBuffer *new_text;
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guint64 now;
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g_return_if_fail(element != NULL);
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g_return_if_fail(GST_IS_TEXTOVERLAY(element));
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overlay = GST_TEXTOVERLAY(element);
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video_frame = gst_pad_pull(overlay->video_sinkpad);
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now = GST_BUFFER_TIMESTAMP(video_frame);
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if (now >= overlay->next_known_text_change) {
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GST_DEBUG ( "rendering '%s'", overlay->next_known_text->str);
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pango_layout_set_markup(overlay->layout,
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overlay->next_known_text->str,
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overlay->next_known_text->len);
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render_text(overlay);
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overlay->next_known_text_change = 0;
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}
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if (overlay->next_known_text_change == 0) {
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/* read all text buffers until we get one "in the future" */
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while (1) {
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new_text = gst_pad_pull(overlay->text_sinkpad);
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if (!new_text)
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break;
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overlay->next_known_text_change =
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GST_BUFFER_TIMESTAMP(new_text);
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overlay->next_known_text = g_string_truncate
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(overlay->next_known_text, 0);
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overlay->next_known_text = g_string_append_len
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(overlay->next_known_text,
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(gchar *) GST_BUFFER_DATA(new_text),
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GST_BUFFER_SIZE(new_text));
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gst_buffer_unref(new_text);
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break;
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}
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}
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gst_textoverlay_video_chain(overlay->srcpad, video_frame);
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}
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static GstElementStateReturn
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gst_textoverlay_change_state(GstElement *element)
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{
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GstTextOverlay *overlay;
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overlay = GST_TEXTOVERLAY(element);
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switch (GST_STATE_TRANSITION(element))
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{
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case GST_STATE_PAUSED_TO_PLAYING:
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break;
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case GST_STATE_PLAYING_TO_PAUSED:
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break;
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case GST_STATE_PAUSED_TO_READY:
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break;
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}
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parent_class->change_state(element);
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return GST_STATE_SUCCESS;
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}
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static void
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gst_textoverlay_finalize(GObject *object)
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{
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GstTextOverlay *overlay = GST_TEXTOVERLAY(object);
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if (overlay->layout) {
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g_object_unref(overlay->layout);
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overlay->layout = NULL;
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}
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if (overlay->bitmap.buffer) {
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g_free(overlay->bitmap.buffer);
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overlay->bitmap.buffer = NULL;
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}
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G_OBJECT_CLASS(parent_class)->finalize(object);
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}
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static void
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gst_textoverlay_init(GstTextOverlay *overlay)
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{
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/* video sink */
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overlay->video_sinkpad = gst_pad_new_from_template(
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GST_PAD_TEMPLATE_GET(video_sink_template_factory), "video_sink");
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/* gst_pad_set_chain_function(overlay->video_sinkpad, gst_textoverlay_video_chain); */
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gst_pad_set_link_function(overlay->video_sinkpad, gst_textoverlay_video_sinkconnect);
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gst_element_add_pad(GST_ELEMENT(overlay), overlay->video_sinkpad);
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/* text sink */
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overlay->text_sinkpad = gst_pad_new_from_template(
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GST_PAD_TEMPLATE_GET(text_sink_template_factory), "text_sink");
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/* gst_pad_set_link_function(overlay->text_sinkpad, gst_textoverlay_text_sinkconnect); */
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gst_element_add_pad(GST_ELEMENT(overlay), overlay->text_sinkpad);
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/* (video) source */
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overlay->srcpad = gst_pad_new_from_template(
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GST_PAD_TEMPLATE_GET(textoverlay_src_template_factory), "src");
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gst_element_add_pad(GST_ELEMENT(overlay), overlay->srcpad);
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overlay->layout = pango_layout_new(GST_TEXTOVERLAY_GET_CLASS(overlay)->pango_context);
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memset(&overlay->bitmap, 0, sizeof(overlay->bitmap));
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overlay->halign = GST_TEXT_OVERLAY_HALIGN_CENTER;
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overlay->valign = GST_TEXT_OVERLAY_VALIGN_BASELINE;
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overlay->x0 = overlay->y0 = 0;
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overlay->next_known_text = g_string_new(NULL);
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overlay->next_known_text_change = 0;
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gst_element_set_loop_function(GST_ELEMENT(overlay), gst_textoverlay_loop);
|
|
}
|
|
|
|
|
|
static void
|
|
gst_textoverlay_set_property(GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
|
|
{
|
|
GstTextOverlay *overlay;
|
|
|
|
/* it's not null if we got it, but it might not be ours */
|
|
g_return_if_fail(GST_IS_TEXTOVERLAY(object));
|
|
overlay = GST_TEXTOVERLAY(object);
|
|
|
|
switch (prop_id)
|
|
{
|
|
|
|
case ARG_TEXT:
|
|
pango_layout_set_markup(overlay->layout, g_value_get_string(value), -1);
|
|
render_text(overlay);
|
|
break;
|
|
|
|
case ARG_VALIGN:
|
|
if (strcasecmp(g_value_get_string(value), "baseline") == 0)
|
|
overlay->valign = GST_TEXT_OVERLAY_VALIGN_BASELINE;
|
|
else if (strcasecmp(g_value_get_string(value), "bottom") == 0)
|
|
overlay->valign = GST_TEXT_OVERLAY_VALIGN_BOTTOM;
|
|
else if (strcasecmp(g_value_get_string(value), "top") == 0)
|
|
overlay->valign = GST_TEXT_OVERLAY_VALIGN_TOP;
|
|
else
|
|
g_warning("Invalid 'valign' property value: %s",
|
|
g_value_get_string(value));
|
|
break;
|
|
|
|
case ARG_HALIGN:
|
|
if (strcasecmp(g_value_get_string(value), "left") == 0)
|
|
overlay->halign = GST_TEXT_OVERLAY_HALIGN_LEFT;
|
|
else if (strcasecmp(g_value_get_string(value), "right") == 0)
|
|
overlay->halign = GST_TEXT_OVERLAY_HALIGN_RIGHT;
|
|
else if (strcasecmp(g_value_get_string(value), "center") == 0)
|
|
overlay->halign = GST_TEXT_OVERLAY_HALIGN_CENTER;
|
|
else
|
|
g_warning("Invalid 'halign' property value: %s",
|
|
g_value_get_string(value));
|
|
break;
|
|
|
|
case ARG_X0:
|
|
overlay->x0 = g_value_get_int(value);
|
|
break;
|
|
|
|
case ARG_Y0:
|
|
overlay->y0 = g_value_get_int(value);
|
|
break;
|
|
|
|
case ARG_FONT_DESC:
|
|
{
|
|
PangoFontDescription *desc;
|
|
desc = pango_font_description_from_string(g_value_get_string(value));
|
|
if (desc) {
|
|
g_message("font description set: %s", g_value_get_string(value));
|
|
pango_layout_set_font_description(overlay->layout, desc);
|
|
pango_font_description_free(desc);
|
|
render_text(overlay);
|
|
} else
|
|
g_warning("font description parse failed: %s", g_value_get_string(value));
|
|
break;
|
|
}
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_textoverlay_get_property(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
|
|
{
|
|
GstTextOverlay *overlay;
|
|
|
|
/* it's not null if we got it, but it might not be ours */
|
|
g_return_if_fail(GST_IS_TEXTOVERLAY(object));
|
|
overlay = GST_TEXTOVERLAY(object);
|
|
|
|
switch (prop_id) {
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static gboolean
|
|
plugin_init(GModule *module, GstPlugin *plugin)
|
|
{
|
|
GstElementFactory *factory;
|
|
|
|
factory = gst_element_factory_new("textoverlay", GST_TYPE_TEXTOVERLAY,
|
|
&textoverlay_details);
|
|
g_return_val_if_fail(factory != NULL, FALSE);
|
|
gst_element_factory_set_rank(factory, GST_ELEMENT_RANK_PRIMARY);
|
|
|
|
gst_element_factory_add_pad_template(factory,
|
|
GST_PAD_TEMPLATE_GET(textoverlay_src_template_factory));
|
|
gst_element_factory_add_pad_template(factory,
|
|
GST_PAD_TEMPLATE_GET(video_sink_template_factory));
|
|
gst_element_factory_add_pad_template(factory,
|
|
GST_PAD_TEMPLATE_GET(text_sink_template_factory));
|
|
|
|
gst_plugin_add_feature(plugin, GST_PLUGIN_FEATURE(factory));
|
|
|
|
//texttestsrc_plugin_init(module, plugin);
|
|
//subparse_plugin_init(module, plugin);
|
|
return TRUE;
|
|
}
|
|
|
|
GstPluginDesc plugin_desc = {
|
|
GST_VERSION_MAJOR,
|
|
GST_VERSION_MINOR,
|
|
"textoverlay",
|
|
plugin_init
|
|
};
|
|
|