gstreamer/ext/pango/gsttimeoverlay.c
2021-03-16 17:58:59 +00:00

386 lines
13 KiB
C

/* GStreamer
* Copyright (C) 1999 Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) 2005-2014 Tim-Philipp Müller <tim@centricular.net>
*
* 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-timeoverlay
* @title: timeoverlay
* @see_also: #GstBaseTextOverlay, #GstClockOverlay
*
* This element overlays the buffer time stamps of a video stream on
* top of itself. You can position the text and configure the font details
* using its properties.
*
* By default, the time stamp is displayed in the top left corner of the picture,
* with some padding to the left and to the top.
*
* |[
* gst-launch-1.0 -v videotestsrc ! timeoverlay ! autovideosink
* ]|
* Display the time stamps in the top left corner of the video picture.
* |[
* gst-launch-1.0 -v videotestsrc ! timeoverlay halignment=right valignment=bottom text="Stream time:" shaded-background=true font-desc="Sans, 24" ! autovideosink
* ]|
* Another pipeline that displays the time stamps with some leading
* text in the bottom right corner of the video picture, with the background
* of the text being shaded in order to make it more legible on top of a
* bright video background.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/video/video.h>
#include "gsttimeoverlay.h"
#include "gstpangoelements.h"
#define DEFAULT_TIME_LINE GST_TIME_OVERLAY_TIME_LINE_BUFFER_TIME
#define DEFAULT_SHOW_TIMES_AS_DATES FALSE
#define DEFAULT_DATETIME_FORMAT "%F %T" /* YYYY-MM-DD hh:mm:ss */
enum
{
PROP_0,
PROP_TIME_LINE,
PROP_SHOW_TIMES_AS_DATES,
PROP_DATETIME_EPOCH,
PROP_DATETIME_FORMAT,
};
#define gst_time_overlay_parent_class parent_class
G_DEFINE_TYPE (GstTimeOverlay, gst_time_overlay, GST_TYPE_BASE_TEXT_OVERLAY);
GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (timeoverlay, "timeoverlay",
GST_RANK_NONE, GST_TYPE_TIME_OVERLAY, pango_element_init (plugin));
static void gst_time_overlay_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_time_overlay_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
/**
* GstTimeOverlayTimeLine::elapsed-running-time:
*
* Overlay elapsed running time since the first observed running time.
*
* Since: 1.20
*/
#define GST_TYPE_TIME_OVERLAY_TIME_LINE (gst_time_overlay_time_line_type())
static GType
gst_time_overlay_time_line_type (void)
{
static GType time_line_type = 0;
static const GEnumValue modes[] = {
{GST_TIME_OVERLAY_TIME_LINE_BUFFER_TIME, "buffer-time", "buffer-time"},
{GST_TIME_OVERLAY_TIME_LINE_STREAM_TIME, "stream-time", "stream-time"},
{GST_TIME_OVERLAY_TIME_LINE_RUNNING_TIME, "running-time", "running-time"},
{GST_TIME_OVERLAY_TIME_LINE_TIME_CODE, "time-code", "time-code"},
{GST_TIME_OVERLAY_TIME_LINE_ELAPSED_RUNNING_TIME,
"elapsed-running-time", "elapsed-running-time"},
{0, NULL, NULL},
};
if (!time_line_type) {
time_line_type = g_enum_register_static ("GstTimeOverlayTimeLine", modes);
}
return time_line_type;
}
static gchar *
gst_time_overlay_render_time (GstTimeOverlay * overlay, GstClockTime time)
{
guint hours, mins, secs, msecs;
if (!GST_CLOCK_TIME_IS_VALID (time))
return g_strdup ("");
hours = (guint) (time / (GST_SECOND * 60 * 60));
mins = (guint) ((time / (GST_SECOND * 60)) % 60);
secs = (guint) ((time / GST_SECOND) % 60);
msecs = (guint) ((time % GST_SECOND) / (1000 * 1000));
return g_strdup_printf ("%u:%02u:%02u.%03u", hours, mins, secs, msecs);
}
/* Called with lock held */
static gchar *
gst_time_overlay_get_text (GstBaseTextOverlay * overlay,
GstBuffer * video_frame)
{
GstTimeOverlay *self = GST_TIME_OVERLAY (overlay);
GstTimeOverlayTimeLine time_line;
gchar *time_str, *txt, *ret;
overlay->need_render = TRUE;
time_line = g_atomic_int_get (&GST_TIME_OVERLAY_CAST (overlay)->time_line);
if (time_line == GST_TIME_OVERLAY_TIME_LINE_TIME_CODE) {
GstVideoTimeCodeMeta *tc_meta =
gst_buffer_get_video_time_code_meta (video_frame);
if (!tc_meta) {
GST_DEBUG ("buffer without valid timecode");
return g_strdup ("00:00:00:00");
}
time_str = gst_video_time_code_to_string (&tc_meta->tc);
GST_DEBUG ("buffer with timecode %s", time_str);
} else {
GstClockTime ts, ts_buffer;
GstSegment *segment = &overlay->segment;
ts_buffer = GST_BUFFER_TIMESTAMP (video_frame);
if (!GST_CLOCK_TIME_IS_VALID (ts_buffer)) {
GST_DEBUG ("buffer without valid timestamp");
return g_strdup ("");
}
GST_DEBUG ("buffer with timestamp %" GST_TIME_FORMAT,
GST_TIME_ARGS (ts_buffer));
switch (time_line) {
case GST_TIME_OVERLAY_TIME_LINE_STREAM_TIME:
ts = gst_segment_to_stream_time (segment, GST_FORMAT_TIME, ts_buffer);
break;
case GST_TIME_OVERLAY_TIME_LINE_RUNNING_TIME:
ts = gst_segment_to_running_time (segment, GST_FORMAT_TIME, ts_buffer);
break;
case GST_TIME_OVERLAY_TIME_LINE_ELAPSED_RUNNING_TIME:
ts = gst_segment_to_running_time (segment, GST_FORMAT_TIME, ts_buffer);
if (self->first_running_time == GST_CLOCK_TIME_NONE)
self->first_running_time = ts;
ts -= self->first_running_time;
break;
case GST_TIME_OVERLAY_TIME_LINE_BUFFER_TIME:
default:
ts = ts_buffer;
break;
}
if (self->show_times_as_dates) {
GDateTime *datetime;
datetime =
g_date_time_add_seconds (self->datetime_epoch,
(gdouble) GST_BUFFER_TIMESTAMP (video_frame) / GST_SECOND);
time_str = g_date_time_format (datetime, self->datetime_format);
g_date_time_unref (datetime);
} else {
time_str = gst_time_overlay_render_time (GST_TIME_OVERLAY (overlay), ts);
}
}
txt = g_strdup (overlay->default_text);
if (txt != NULL && *txt != '\0') {
ret = g_strdup_printf ("%s %s", txt, time_str);
} else {
ret = time_str;
time_str = NULL;
}
g_free (txt);
g_free (time_str);
return ret;
}
static GstStateChangeReturn
gst_time_overlay_change_state (GstElement * element, GstStateChange transition)
{
GstTimeOverlay *self = GST_TIME_OVERLAY (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
self->first_running_time = GST_CLOCK_TIME_NONE;
break;
default:
break;
}
return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
}
static void
gst_time_overlay_finalize (GObject * gobject)
{
GstTimeOverlay *self = GST_TIME_OVERLAY (gobject);
g_date_time_unref (self->datetime_epoch);
g_free (self->datetime_format);
G_OBJECT_CLASS (parent_class)->finalize (gobject);
}
static void
gst_time_overlay_class_init (GstTimeOverlayClass * klass)
{
GstElementClass *gstelement_class;
GstBaseTextOverlayClass *gsttextoverlay_class;
GObjectClass *gobject_class;
gsttextoverlay_class = (GstBaseTextOverlayClass *) klass;
gstelement_class = (GstElementClass *) klass;
gobject_class = (GObjectClass *) klass;
gst_element_class_set_static_metadata (gstelement_class, "Time overlay",
"Filter/Editor/Video",
"Overlays buffer time stamps on a video stream",
"Tim-Philipp Müller <tim@centricular.net>");
gsttextoverlay_class->get_text = gst_time_overlay_get_text;
gstelement_class->change_state = gst_time_overlay_change_state;
gobject_class->finalize = gst_time_overlay_finalize;
gobject_class->set_property = gst_time_overlay_set_property;
gobject_class->get_property = gst_time_overlay_get_property;
g_object_class_install_property (gobject_class, PROP_TIME_LINE,
g_param_spec_enum ("time-mode", "Time Mode", "What time to show",
GST_TYPE_TIME_OVERLAY_TIME_LINE, DEFAULT_TIME_LINE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_DATETIME_EPOCH,
g_param_spec_boxed ("datetime-epoch", "Datetime Epoch",
"When showing times as dates, the initial date from which time "
"is counted, if not specified prime epoch is used (1900-01-01)",
G_TYPE_DATE_TIME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_DATETIME_FORMAT,
g_param_spec_string ("datetime-format", "Datetime Format",
"When showing times as dates, the format to render date and time in",
DEFAULT_DATETIME_FORMAT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_SHOW_TIMES_AS_DATES,
g_param_spec_boolean ("show-times-as-dates", "Show times as dates",
"Whether to display times, counted from datetime-epoch, as dates",
DEFAULT_SHOW_TIMES_AS_DATES,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_type_mark_as_plugin_api (GST_TYPE_TIME_OVERLAY_TIME_LINE, 0);
}
static gboolean
gst_time_overlay_video_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
GstTimeOverlay *overlay = GST_TIME_OVERLAY (parent);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_STOP:
overlay->first_running_time = GST_CLOCK_TIME_NONE;
break;
default:
break;
}
return overlay->orig_video_event (pad, parent, event);
}
static void
gst_time_overlay_init (GstTimeOverlay * overlay)
{
GstBaseTextOverlay *textoverlay;
PangoContext *context;
PangoFontDescription *font_description;
GstPad *video_sink;
textoverlay = GST_BASE_TEXT_OVERLAY (overlay);
textoverlay->valign = GST_BASE_TEXT_OVERLAY_VALIGN_TOP;
textoverlay->halign = GST_BASE_TEXT_OVERLAY_HALIGN_LEFT;
overlay->time_line = DEFAULT_TIME_LINE;
overlay->show_times_as_dates = DEFAULT_SHOW_TIMES_AS_DATES;
overlay->datetime_epoch = g_date_time_new_utc (1900, 1, 1, 0, 0, 0);
overlay->datetime_format = g_strdup (DEFAULT_DATETIME_FORMAT);
context = textoverlay->pango_context;
pango_context_set_language (context, pango_language_from_string ("en_US"));
pango_context_set_base_dir (context, PANGO_DIRECTION_LTR);
font_description = pango_font_description_new ();
pango_font_description_set_family_static (font_description, "Monospace");
pango_font_description_set_style (font_description, PANGO_STYLE_NORMAL);
pango_font_description_set_variant (font_description, PANGO_VARIANT_NORMAL);
pango_font_description_set_weight (font_description, PANGO_WEIGHT_NORMAL);
pango_font_description_set_stretch (font_description, PANGO_STRETCH_NORMAL);
pango_font_description_set_size (font_description, 18 * PANGO_SCALE);
pango_context_set_font_description (context, font_description);
pango_font_description_free (font_description);
video_sink = gst_element_get_static_pad (GST_ELEMENT (overlay), "video_sink");
overlay->orig_video_event = GST_PAD_EVENTFUNC (video_sink);
gst_pad_set_event_function (video_sink, gst_time_overlay_video_event);
}
static void
gst_time_overlay_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstTimeOverlay *overlay = GST_TIME_OVERLAY (object);
switch (prop_id) {
case PROP_TIME_LINE:
g_atomic_int_set (&overlay->time_line, g_value_get_enum (value));
break;
case PROP_SHOW_TIMES_AS_DATES:
overlay->show_times_as_dates = g_value_get_boolean (value);
break;
case PROP_DATETIME_EPOCH:
g_date_time_unref (overlay->datetime_epoch);
overlay->datetime_epoch = (GDateTime *) g_value_dup_boxed (value);
break;
case PROP_DATETIME_FORMAT:
g_free (overlay->datetime_format);
overlay->datetime_format = g_value_dup_string (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_time_overlay_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstTimeOverlay *overlay = GST_TIME_OVERLAY (object);
switch (prop_id) {
case PROP_TIME_LINE:
g_value_set_enum (value, g_atomic_int_get (&overlay->time_line));
break;
case PROP_SHOW_TIMES_AS_DATES:
g_value_set_boolean (value, overlay->show_times_as_dates);
break;
case PROP_DATETIME_EPOCH:
g_value_set_boxed (value, overlay->datetime_epoch);
break;
case PROP_DATETIME_FORMAT:
g_value_set_string (value, overlay->datetime_format);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}