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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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582 lines
17 KiB
C
582 lines
17 KiB
C
/* GStreamer
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* Copyright (C) <2011> Jon Nordby <jononor@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:element-cairooverlay
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* @title: cairooverlay
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*
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* cairooverlay renders an overlay using a application provided render function.
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*
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* The full example can be found in tests/examples/cairo/cairo_overlay.c
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*
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* ## Example code
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* |[
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*
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* #include <gst/gst.h>
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* #include <gst/video/video.h>
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*
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* ...
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*
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* typedef struct {
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* gboolean valid;
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* int width;
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* int height;
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* } CairoOverlayState;
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*
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* ...
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*
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* static void
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* prepare_overlay (GstElement * overlay, GstCaps * caps, gpointer user_data)
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* {
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* CairoOverlayState *state = (CairoOverlayState *)user_data;
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*
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* gst_video_format_parse_caps (caps, NULL, &state->width, &state->height);
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* state->valid = TRUE;
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* }
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*
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* static void
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* draw_overlay (GstElement * overlay, cairo_t * cr, guint64 timestamp,
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* guint64 duration, gpointer user_data)
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* {
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* CairoOverlayState *s = (CairoOverlayState *)user_data;
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* double scale;
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*
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* if (!s->valid)
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* return;
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*
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* scale = 2*(((timestamp/(int)1e7) % 70)+30)/100.0;
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* cairo_translate(cr, s->width/2, (s->height/2)-30);
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* cairo_scale (cr, scale, scale);
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*
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* cairo_move_to (cr, 0, 0);
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* cairo_curve_to (cr, 0,-30, -50,-30, -50,0);
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* cairo_curve_to (cr, -50,30, 0,35, 0,60 );
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* cairo_curve_to (cr, 0,35, 50,30, 50,0 ); *
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* cairo_curve_to (cr, 50,-30, 0,-30, 0,0 );
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* cairo_set_source_rgba (cr, 0.9, 0.0, 0.1, 0.7);
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* cairo_fill (cr);
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* }
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*
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* ...
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*
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* cairo_overlay = gst_element_factory_make ("cairooverlay", "overlay");
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*
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* g_signal_connect (cairo_overlay, "draw", G_CALLBACK (draw_overlay),
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* overlay_state);
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* g_signal_connect (cairo_overlay, "caps-changed",
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* G_CALLBACK (prepare_overlay), overlay_state);
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* ...
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*
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* ]|
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*
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*/
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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 "gstcairooverlay.h"
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#include <gst/video/video.h>
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#include <cairo.h>
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/* RGB16 is native-endianness in GStreamer */
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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#define TEMPLATE_CAPS GST_VIDEO_CAPS_MAKE("{ BGRx, BGRA, RGB16 }")
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#else
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#define TEMPLATE_CAPS GST_VIDEO_CAPS_MAKE("{ xRGB, ARGB, RGB16 }")
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#endif
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GST_DEBUG_CATEGORY (cairo_debug);
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static GstStaticPadTemplate gst_cairo_overlay_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (TEMPLATE_CAPS)
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);
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static GstStaticPadTemplate gst_cairo_overlay_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (TEMPLATE_CAPS)
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);
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G_DEFINE_TYPE (GstCairoOverlay, gst_cairo_overlay, GST_TYPE_BASE_TRANSFORM);
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GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (cairooverlay, "cairooverlay",
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GST_RANK_NONE, GST_TYPE_CAIRO_OVERLAY, GST_DEBUG_CATEGORY_INIT (cairo_debug,
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"cairo", 0, "Cairo elements"););
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enum
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{
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PROP_0,
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PROP_DRAW_ON_TRANSPARENT_SURFACE,
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};
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#define DEFAULT_DRAW_ON_TRANSPARENT_SURFACE (FALSE)
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enum
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{
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SIGNAL_DRAW,
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SIGNAL_CAPS_CHANGED,
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N_SIGNALS
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};
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static guint gst_cairo_overlay_signals[N_SIGNALS];
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static void
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gst_cairo_overlay_set_property (GObject * object, guint property_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstCairoOverlay *overlay = GST_CAIRO_OVERLAY (object);
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GST_OBJECT_LOCK (overlay);
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switch (property_id) {
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case PROP_DRAW_ON_TRANSPARENT_SURFACE:
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overlay->draw_on_transparent_surface = g_value_get_boolean (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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GST_OBJECT_UNLOCK (overlay);
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}
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static void
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gst_cairo_overlay_get_property (GObject * object, guint property_id,
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GValue * value, GParamSpec * pspec)
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{
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GstCairoOverlay *overlay = GST_CAIRO_OVERLAY (object);
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GST_OBJECT_LOCK (overlay);
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switch (property_id) {
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case PROP_DRAW_ON_TRANSPARENT_SURFACE:
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g_value_set_boolean (value, overlay->draw_on_transparent_surface);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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GST_OBJECT_UNLOCK (overlay);
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}
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static gboolean
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gst_cairo_overlay_query (GstBaseTransform * trans, GstPadDirection direction,
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GstQuery * query)
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{
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GstCairoOverlay *overlay = GST_CAIRO_OVERLAY (trans);
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switch (GST_QUERY_TYPE (query)) {
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case GST_QUERY_ALLOCATION:
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{
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/* We're always running in passthrough mode, which means that
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* basetransform just passes through ALLOCATION queries and
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* never ever calls BaseTransform::decide_allocation().
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*
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* We hook into the query handling for that reason
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*/
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overlay->attach_compo_to_buffer = FALSE;
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if (!GST_BASE_TRANSFORM_CLASS (gst_cairo_overlay_parent_class)->query
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(trans, direction, query)) {
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return FALSE;
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}
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overlay->attach_compo_to_buffer = gst_query_find_allocation_meta (query,
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GST_VIDEO_OVERLAY_COMPOSITION_META_API_TYPE, NULL);
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return TRUE;
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}
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default:
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return
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GST_BASE_TRANSFORM_CLASS (gst_cairo_overlay_parent_class)->query
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(trans, direction, query);
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}
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}
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static gboolean
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gst_cairo_overlay_set_caps (GstBaseTransform * trans, GstCaps * in_caps,
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GstCaps * out_caps)
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{
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GstCairoOverlay *overlay = GST_CAIRO_OVERLAY (trans);
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if (!gst_video_info_from_caps (&overlay->info, in_caps))
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return FALSE;
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g_signal_emit (overlay, gst_cairo_overlay_signals[SIGNAL_CAPS_CHANGED], 0,
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in_caps, NULL);
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return TRUE;
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}
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/* Copy from video-overlay-composition.c */
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static void
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gst_video_overlay_rectangle_premultiply_0 (GstVideoFrame * frame)
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{
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int i, j;
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int width = GST_VIDEO_FRAME_WIDTH (frame);
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int height = GST_VIDEO_FRAME_HEIGHT (frame);
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int stride = GST_VIDEO_FRAME_PLANE_STRIDE (frame, 0);
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guint8 *data = GST_VIDEO_FRAME_PLANE_DATA (frame, 0);
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for (j = 0; j < height; ++j) {
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guint8 *line;
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line = data;
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line += stride * j;
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for (i = 0; i < width; ++i) {
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int a = line[0];
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line[1] = line[1] * a / 255;
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line[2] = line[2] * a / 255;
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line[3] = line[3] * a / 255;
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line += 4;
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}
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}
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}
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/* Copy from video-overlay-composition.c */
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static void
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gst_video_overlay_rectangle_premultiply_3 (GstVideoFrame * frame)
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{
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int i, j;
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int width = GST_VIDEO_FRAME_WIDTH (frame);
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int height = GST_VIDEO_FRAME_HEIGHT (frame);
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int stride = GST_VIDEO_FRAME_PLANE_STRIDE (frame, 0);
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guint8 *data = GST_VIDEO_FRAME_PLANE_DATA (frame, 0);
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for (j = 0; j < height; ++j) {
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guint8 *line;
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line = data;
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line += stride * j;
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for (i = 0; i < width; ++i) {
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int a = line[3];
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line[0] = line[0] * a / 255;
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line[1] = line[1] * a / 255;
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line[2] = line[2] * a / 255;
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line += 4;
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}
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}
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}
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/* Copy from video-overlay-composition.c */
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static void
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gst_video_overlay_rectangle_premultiply (GstVideoFrame * frame)
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{
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gint alpha_offset;
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alpha_offset = GST_VIDEO_FRAME_COMP_POFFSET (frame, 3);
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switch (alpha_offset) {
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case 0:
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gst_video_overlay_rectangle_premultiply_0 (frame);
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break;
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case 3:
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gst_video_overlay_rectangle_premultiply_3 (frame);
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break;
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default:
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g_assert_not_reached ();
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break;
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}
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}
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/* Copy from video-overlay-composition.c */
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static void
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gst_video_overlay_rectangle_unpremultiply_0 (GstVideoFrame * frame)
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{
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int i, j;
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int width = GST_VIDEO_FRAME_WIDTH (frame);
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int height = GST_VIDEO_FRAME_HEIGHT (frame);
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int stride = GST_VIDEO_FRAME_PLANE_STRIDE (frame, 0);
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guint8 *data = GST_VIDEO_FRAME_PLANE_DATA (frame, 0);
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for (j = 0; j < height; ++j) {
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guint8 *line;
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line = data;
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line += stride * j;
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for (i = 0; i < width; ++i) {
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int a = line[0];
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if (a) {
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line[1] = MIN ((line[1] * 255 + a / 2) / a, 255);
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line[2] = MIN ((line[2] * 255 + a / 2) / a, 255);
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line[3] = MIN ((line[3] * 255 + a / 2) / a, 255);
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}
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line += 4;
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}
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}
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}
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/* Copy from video-overlay-composition.c */
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static void
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gst_video_overlay_rectangle_unpremultiply_3 (GstVideoFrame * frame)
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{
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int i, j;
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int width = GST_VIDEO_FRAME_WIDTH (frame);
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int height = GST_VIDEO_FRAME_HEIGHT (frame);
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int stride = GST_VIDEO_FRAME_PLANE_STRIDE (frame, 0);
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guint8 *data = GST_VIDEO_FRAME_PLANE_DATA (frame, 0);
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for (j = 0; j < height; ++j) {
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guint8 *line;
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line = data;
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line += stride * j;
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for (i = 0; i < width; ++i) {
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int a = line[3];
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if (a) {
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line[0] = MIN ((line[0] * 255 + a / 2) / a, 255);
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line[1] = MIN ((line[1] * 255 + a / 2) / a, 255);
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line[2] = MIN ((line[2] * 255 + a / 2) / a, 255);
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}
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line += 4;
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}
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}
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}
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/* Copy from video-overlay-composition.c */
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static void
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gst_video_overlay_rectangle_unpremultiply (GstVideoFrame * frame)
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{
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gint alpha_offset;
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alpha_offset = GST_VIDEO_FRAME_COMP_POFFSET (frame, 3);
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switch (alpha_offset) {
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case 0:
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gst_video_overlay_rectangle_unpremultiply_0 (frame);
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break;
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case 3:
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gst_video_overlay_rectangle_unpremultiply_3 (frame);
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break;
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default:
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g_assert_not_reached ();
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break;
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}
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}
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static GstFlowReturn
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gst_cairo_overlay_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
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{
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GstCairoOverlay *overlay = GST_CAIRO_OVERLAY (trans);
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GstVideoFrame frame;
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cairo_surface_t *surface;
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cairo_t *cr;
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cairo_format_t format;
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gboolean draw_on_transparent_surface = overlay->draw_on_transparent_surface;
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switch (GST_VIDEO_INFO_FORMAT (&overlay->info)) {
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case GST_VIDEO_FORMAT_ARGB:
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case GST_VIDEO_FORMAT_BGRA:
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format = CAIRO_FORMAT_ARGB32;
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break;
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case GST_VIDEO_FORMAT_xRGB:
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case GST_VIDEO_FORMAT_BGRx:
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format = CAIRO_FORMAT_RGB24;
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break;
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case GST_VIDEO_FORMAT_RGB16:
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format = CAIRO_FORMAT_RGB16_565;
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break;
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default:
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{
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GST_WARNING ("No matching cairo format for %s",
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gst_video_format_to_string (GST_VIDEO_INFO_FORMAT (&overlay->info)));
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return GST_FLOW_ERROR;
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}
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}
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/* If we need to map the buffer writable, do so */
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if (!draw_on_transparent_surface || !overlay->attach_compo_to_buffer) {
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if (!gst_video_frame_map (&frame, &overlay->info, buf, GST_MAP_READWRITE)) {
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return GST_FLOW_ERROR;
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}
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} else {
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frame.buffer = NULL;
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}
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if (draw_on_transparent_surface) {
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surface =
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cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
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GST_VIDEO_INFO_WIDTH (&overlay->info),
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GST_VIDEO_INFO_HEIGHT (&overlay->info));
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} else {
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if (format == CAIRO_FORMAT_ARGB32)
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gst_video_overlay_rectangle_premultiply (&frame);
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surface =
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cairo_image_surface_create_for_data (GST_VIDEO_FRAME_PLANE_DATA (&frame,
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0), format, GST_VIDEO_FRAME_WIDTH (&frame),
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GST_VIDEO_FRAME_HEIGHT (&frame), GST_VIDEO_FRAME_PLANE_STRIDE (&frame,
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0));
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}
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if (G_UNLIKELY (!surface))
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return GST_FLOW_ERROR;
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cr = cairo_create (surface);
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if (G_UNLIKELY (!cr)) {
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cairo_surface_destroy (surface);
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return GST_FLOW_ERROR;
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}
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g_signal_emit (overlay, gst_cairo_overlay_signals[SIGNAL_DRAW], 0,
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cr, GST_BUFFER_PTS (buf), GST_BUFFER_DURATION (buf), NULL);
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cairo_destroy (cr);
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if (draw_on_transparent_surface) {
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guint size;
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GstBuffer *surface_buffer;
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GstVideoOverlayRectangle *rect;
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GstVideoOverlayComposition *composition;
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gsize offset[GST_VIDEO_MAX_PLANES] = { 0, };
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gint stride[GST_VIDEO_MAX_PLANES] = { 0, };
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size =
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cairo_image_surface_get_height (surface) *
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cairo_image_surface_get_stride (surface);
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stride[0] = cairo_image_surface_get_stride (surface);
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/* Create a GstVideoOverlayComposition for blending, this handles
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* pre-multiplied alpha correctly */
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surface_buffer =
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gst_buffer_new_wrapped_full (0, cairo_image_surface_get_data (surface),
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size, 0, size, surface, (GDestroyNotify) cairo_surface_destroy);
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gst_buffer_add_video_meta_full (surface_buffer, GST_VIDEO_FRAME_FLAG_NONE,
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(G_BYTE_ORDER ==
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G_LITTLE_ENDIAN ? GST_VIDEO_FORMAT_BGRA : GST_VIDEO_FORMAT_ARGB),
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GST_VIDEO_INFO_WIDTH (&overlay->info),
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GST_VIDEO_INFO_HEIGHT (&overlay->info), 1, offset, stride);
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rect =
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gst_video_overlay_rectangle_new_raw (surface_buffer, 0, 0,
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GST_VIDEO_INFO_WIDTH (&overlay->info),
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GST_VIDEO_INFO_HEIGHT (&overlay->info),
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GST_VIDEO_OVERLAY_FORMAT_FLAG_PREMULTIPLIED_ALPHA);
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gst_buffer_unref (surface_buffer);
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if (overlay->attach_compo_to_buffer) {
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GstVideoOverlayCompositionMeta *composition_meta;
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composition_meta = gst_buffer_get_video_overlay_composition_meta (buf);
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if (composition_meta) {
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GstVideoOverlayComposition *merged_composition =
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gst_video_overlay_composition_copy (composition_meta->overlay);
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gst_video_overlay_composition_add_rectangle (merged_composition, rect);
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gst_video_overlay_composition_unref (composition_meta->overlay);
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composition_meta->overlay = merged_composition;
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gst_video_overlay_rectangle_unref (rect);
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} else {
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composition = gst_video_overlay_composition_new (rect);
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gst_video_overlay_rectangle_unref (rect);
|
|
gst_buffer_add_video_overlay_composition_meta (buf, composition);
|
|
gst_video_overlay_composition_unref (composition);
|
|
}
|
|
} else {
|
|
composition = gst_video_overlay_composition_new (rect);
|
|
gst_video_overlay_rectangle_unref (rect);
|
|
gst_video_overlay_composition_blend (composition, &frame);
|
|
gst_video_overlay_composition_unref (composition);
|
|
}
|
|
} else {
|
|
cairo_surface_destroy (surface);
|
|
if (format == CAIRO_FORMAT_ARGB32)
|
|
gst_video_overlay_rectangle_unpremultiply (&frame);
|
|
}
|
|
|
|
if (frame.buffer) {
|
|
gst_video_frame_unmap (&frame);
|
|
}
|
|
|
|
return GST_FLOW_OK;
|
|
}
|
|
|
|
static void
|
|
gst_cairo_overlay_class_init (GstCairoOverlayClass * klass)
|
|
{
|
|
GstBaseTransformClass *btrans_class;
|
|
GstElementClass *element_class;
|
|
GObjectClass *gobject_class;
|
|
|
|
btrans_class = (GstBaseTransformClass *) klass;
|
|
element_class = (GstElementClass *) klass;
|
|
gobject_class = (GObjectClass *) klass;
|
|
|
|
btrans_class->set_caps = gst_cairo_overlay_set_caps;
|
|
btrans_class->transform_ip = gst_cairo_overlay_transform_ip;
|
|
btrans_class->query = gst_cairo_overlay_query;
|
|
|
|
gobject_class->set_property = gst_cairo_overlay_set_property;
|
|
gobject_class->get_property = gst_cairo_overlay_get_property;
|
|
|
|
g_object_class_install_property (gobject_class,
|
|
PROP_DRAW_ON_TRANSPARENT_SURFACE,
|
|
g_param_spec_boolean ("draw-on-transparent-surface",
|
|
"Draw on transparent surface",
|
|
"Let the draw signal work on a transparent surface "
|
|
"and blend the results with the video at a later time",
|
|
DEFAULT_DRAW_ON_TRANSPARENT_SURFACE,
|
|
GST_PARAM_CONTROLLABLE | GST_PARAM_MUTABLE_PLAYING | G_PARAM_READWRITE
|
|
| G_PARAM_STATIC_STRINGS));
|
|
|
|
/**
|
|
* GstCairoOverlay::draw:
|
|
* @overlay: Overlay element emitting the signal.
|
|
* @cr: Cairo context to draw to.
|
|
* @timestamp: Timestamp (see #GstClockTime) of the current buffer.
|
|
* @duration: Duration (see #GstClockTime) of the current buffer.
|
|
*
|
|
* This signal is emitted when the overlay should be drawn.
|
|
*/
|
|
gst_cairo_overlay_signals[SIGNAL_DRAW] =
|
|
g_signal_new ("draw",
|
|
G_TYPE_FROM_CLASS (klass),
|
|
0, 0, NULL, NULL, NULL,
|
|
G_TYPE_NONE, 3, CAIRO_GOBJECT_TYPE_CONTEXT, G_TYPE_UINT64, G_TYPE_UINT64);
|
|
|
|
/**
|
|
* GstCairoOverlay::caps-changed:
|
|
* @overlay: Overlay element emitting the signal.
|
|
* @caps: The #GstCaps of the element.
|
|
*
|
|
* This signal is emitted when the caps of the element has changed.
|
|
*/
|
|
gst_cairo_overlay_signals[SIGNAL_CAPS_CHANGED] =
|
|
g_signal_new ("caps-changed",
|
|
G_TYPE_FROM_CLASS (klass),
|
|
0, 0, NULL, NULL, NULL, G_TYPE_NONE, 1, GST_TYPE_CAPS);
|
|
|
|
gst_element_class_set_static_metadata (element_class, "Cairo overlay",
|
|
"Filter/Editor/Video",
|
|
"Render overlay on a video stream using Cairo",
|
|
"Jon Nordby <jononor@gmail.com>");
|
|
|
|
gst_element_class_add_static_pad_template (element_class,
|
|
&gst_cairo_overlay_sink_template);
|
|
gst_element_class_add_static_pad_template (element_class,
|
|
&gst_cairo_overlay_src_template);
|
|
}
|
|
|
|
static void
|
|
gst_cairo_overlay_init (GstCairoOverlay * overlay)
|
|
{
|
|
/* nothing to do */
|
|
}
|