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