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gstreamer/ext/gl/gstglvideomixer.c
Edward Hervey 90028d68fe glvideomixer: Don't use context if not present 
Avoids assertions at runtime
2015-03-31 16:31:18 +02:00

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/*
* GStreamer
* Copyright (C) 2009 Julien Isorce <julien.isorce@gmail.com>
*
* 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-glvideomixer
*
* Composites a number of streams into a single output scene using OpenGL in
* a similar fashion to compositor and videomixer. See the compositor plugin
* for documentation about the #GstGLVideoMixerPad properties.
*
* <refsect2>
* <title>Examples</title>
* |[
* gst-launch-1.0 glvideomixer name=m ! glimagesink \
* videotestsrc ! video/x-raw, format=YUY2 ! m. \
* videotestsrc pattern=12 ! video/x-raw, format=I420, framerate=5/1, width=100, height=200 ! queue ! m. \
* videotestsrc ! video/x-raw, format=RGB, framerate=15/1, width=1500, height=1500 ! gleffects effect=3 ! queue ! m. \
* videotestsrc ! gleffects effect=2 ! queue ! m. \
* videotestsrc ! glfiltercube ! queue ! m. \
* videotestsrc ! gleffects effect=6 ! queue ! m.
* ]|
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstglvideomixer.h"
#include "gstglmixerbin.h"
#define GST_CAT_DEFAULT gst_gl_video_mixer_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
#define GST_GL_TYPE_VIDEO_MIXER_BACKGROUND (gst_gl_video_mixer_background_get_type())
static GType
gst_gl_video_mixer_background_get_type (void)
{
static GType mixer_background_type = 0;
static const GEnumValue mixer_background[] = {
{GST_GL_VIDEO_MIXER_BACKGROUND_CHECKER, "Checker pattern", "checker"},
{GST_GL_VIDEO_MIXER_BACKGROUND_BLACK, "Black", "black"},
{GST_GL_VIDEO_MIXER_BACKGROUND_WHITE, "White", "white"},
{GST_GL_VIDEO_MIXER_BACKGROUND_TRANSPARENT,
"Transparent Background to enable further compositing", "transparent"},
{0, NULL, NULL},
};
if (!mixer_background_type) {
mixer_background_type =
g_enum_register_static ("GstGLVideoMixerBackground", mixer_background);
}
return mixer_background_type;
}
#define DEFAULT_PAD_XPOS 0
#define DEFAULT_PAD_YPOS 0
#define DEFAULT_PAD_WIDTH 0
#define DEFAULT_PAD_HEIGHT 0
#define DEFAULT_PAD_ALPHA 1.0
#define DEFAULT_PAD_ZORDER 0
enum
{
PROP_INPUT_0,
PROP_INPUT_XPOS,
PROP_INPUT_YPOS,
PROP_INPUT_WIDTH,
PROP_INPUT_HEIGHT,
PROP_INPUT_ALPHA,
PROP_INPUT_ZORDER,
};
static void gst_gl_video_mixer_input_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static void gst_gl_video_mixer_input_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static GstFlowReturn gst_gl_video_mixer_input_chain (GstPad * pad,
GstObject * parent, GstBuffer * buffer);
static GstFlowReturn gst_gl_video_mixer_input_event (GstPad * pad,
GstObject * parent, GstEvent * event);
typedef struct _GstGLVideoMixerInput GstGLVideoMixerInput;
typedef GstGhostPadClass GstGLVideoMixerInputClass;
struct _GstGLVideoMixerInput
{
GstGhostPad parent;
GstSegment segment;
GstPad *mixer_pad;
};
GType gst_gl_video_mixer_input_get_type (void);
G_DEFINE_TYPE (GstGLVideoMixerInput, gst_gl_video_mixer_input,
GST_TYPE_GHOST_PAD);
static void
gst_gl_video_mixer_input_init (GstGLVideoMixerInput * self)
{
GstPad *pad = GST_PAD (self);
gst_pad_set_event_function (pad, gst_gl_video_mixer_input_event);
}
static void
gst_gl_video_mixer_input_class_init (GstGLVideoMixerInputClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->set_property = gst_gl_video_mixer_input_set_property;
gobject_class->get_property = gst_gl_video_mixer_input_get_property;
g_object_class_install_property (gobject_class, PROP_INPUT_ZORDER,
g_param_spec_uint ("zorder", "Z-Order", "Z Order of the picture",
0, 10000, DEFAULT_PAD_ZORDER,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_INPUT_XPOS,
g_param_spec_int ("xpos", "X Position", "X Position of the picture",
G_MININT, G_MAXINT, DEFAULT_PAD_XPOS,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_INPUT_YPOS,
g_param_spec_int ("ypos", "Y Position", "Y Position of the picture",
G_MININT, G_MAXINT, DEFAULT_PAD_YPOS,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_INPUT_WIDTH,
g_param_spec_int ("width", "Width", "Width of the picture",
G_MININT, G_MAXINT, DEFAULT_PAD_WIDTH,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_INPUT_HEIGHT,
g_param_spec_int ("height", "Height", "Height of the picture",
G_MININT, G_MAXINT, DEFAULT_PAD_HEIGHT,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_INPUT_ALPHA,
g_param_spec_double ("alpha", "Alpha", "Alpha of the picture", 0.0, 1.0,
DEFAULT_PAD_ALPHA,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
}
static void
gst_gl_video_mixer_input_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstGLVideoMixerInput *self = (GstGLVideoMixerInput *) object;
if (self->mixer_pad)
g_object_get_property (G_OBJECT (self->mixer_pad), pspec->name, value);
}
static void
gst_gl_video_mixer_input_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstGLVideoMixerInput *self = (GstGLVideoMixerInput *) object;
if (self->mixer_pad)
g_object_set_property (G_OBJECT (self->mixer_pad), pspec->name, value);
}
static GstFlowReturn
gst_gl_video_mixer_input_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer)
{
GstGLVideoMixerInput *self = (GstGLVideoMixerInput *) pad;
GstClockTime timestamp, stream_time;
// gdouble alpha;
timestamp = GST_BUFFER_TIMESTAMP (buffer);
stream_time =
gst_segment_to_stream_time (&self->segment, GST_FORMAT_TIME, timestamp);
gst_object_sync_values (GST_OBJECT (self), stream_time);
#if 0
/* FIXME: implement no-upload on alpha = 0 */
g_object_get (self, "alpha", &alpha, NULL);
if (alpha <= 0.0) {
GST_DEBUG_OBJECT (self, "dropping buffer %" GST_PTR_FORMAT
" due to alpha value %f", buffer, alpha);
gst_buffer_unref (buffer);
return GST_FLOW_OK;
}
#endif
return gst_proxy_pad_chain_default (pad, parent, buffer);
}
static GstFlowReturn
gst_gl_video_mixer_input_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
GstGLVideoMixerInput *self = (GstGLVideoMixerInput *) pad;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEGMENT:
gst_event_copy_segment (event, &self->segment);
break;
default:
break;
}
return gst_pad_event_default (pad, parent, event);
}
static GstGhostPad *
_create_video_mixer_input (GstGLMixerBin * self, GstPad * mixer_pad)
{
GstGLVideoMixerInput *input =
g_object_new (gst_gl_video_mixer_input_get_type (), "name",
GST_OBJECT_NAME (mixer_pad), "direction", GST_PAD_DIRECTION (mixer_pad),
NULL);
if (!gst_ghost_pad_construct (GST_GHOST_PAD (input))) {
gst_object_unref (input);
return NULL;
}
gst_pad_set_chain_function (GST_PAD (input), gst_gl_video_mixer_input_chain);
input->mixer_pad = mixer_pad;
return GST_GHOST_PAD (input);
}
enum
{
PROP_BIN_0,
PROP_BIN_BACKGROUND,
};
#define DEFAULT_BACKGROUND GST_GL_VIDEO_MIXER_BACKGROUND_CHECKER
static void gst_gl_video_mixer_bin_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static void gst_gl_video_mixer_bin_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
typedef GstGLMixerBin GstGLVideoMixerBin;
typedef GstGLMixerBinClass GstGLVideoMixerBinClass;
G_DEFINE_TYPE (GstGLVideoMixerBin, gst_gl_video_mixer_bin,
GST_TYPE_GL_MIXER_BIN);
static void
gst_gl_video_mixer_bin_init (GstGLVideoMixerBin * self)
{
GstGLMixerBin *mix_bin = GST_GL_MIXER_BIN (self);
gst_gl_mixer_bin_finish_init_with_element (mix_bin,
g_object_new (GST_TYPE_GL_VIDEO_MIXER, NULL));
}
static void
gst_gl_video_mixer_bin_class_init (GstGLVideoMixerBinClass * klass)
{
GstGLMixerBinClass *mixer_class = GST_GL_MIXER_BIN_CLASS (klass);
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
mixer_class->create_input_pad = _create_video_mixer_input;
gobject_class->set_property = gst_gl_video_mixer_bin_set_property;
gobject_class->get_property = gst_gl_video_mixer_bin_get_property;
g_object_class_install_property (gobject_class, PROP_BIN_BACKGROUND,
g_param_spec_enum ("background", "Background", "Background type",
GST_GL_TYPE_VIDEO_MIXER_BACKGROUND,
DEFAULT_BACKGROUND, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}
static void
gst_gl_video_mixer_bin_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstGLMixerBin *self = GST_GL_MIXER_BIN (object);
if (self->mixer)
g_object_get_property (G_OBJECT (self->mixer), pspec->name, value);
}
static void
gst_gl_video_mixer_bin_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstGLMixerBin *self = GST_GL_MIXER_BIN (object);
if (self->mixer)
g_object_set_property (G_OBJECT (self->mixer), pspec->name, value);
}
enum
{
PROP_0,
PROP_BACKGROUND,
};
#define DEBUG_INIT \
GST_DEBUG_CATEGORY_INIT (gst_gl_video_mixer_debug, "glvideomixer", 0, "glvideomixer element");
G_DEFINE_TYPE_WITH_CODE (GstGLVideoMixer, gst_gl_video_mixer, GST_TYPE_GL_MIXER,
DEBUG_INIT);
static void gst_gl_video_mixer_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_gl_video_mixer_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstCaps *_update_caps (GstVideoAggregator * vagg, GstCaps * caps);
static void gst_gl_video_mixer_reset (GstGLMixer * mixer);
static gboolean gst_gl_video_mixer_init_shader (GstGLMixer * mixer,
GstCaps * outcaps);
static gboolean gst_gl_video_mixer_process_textures (GstGLMixer * mixer,
GPtrArray * in_frames, guint out_tex);
static void gst_gl_video_mixer_callback (gpointer stuff);
/* *INDENT-OFF* */
/* vertex source */
static const gchar *video_mixer_v_src =
"attribute vec4 a_position; \n"
"attribute vec2 a_texCoord; \n"
"varying vec2 v_texCoord; \n"
"void main() \n"
"{ \n"
" gl_Position = a_position; \n"
" v_texCoord = a_texCoord; \n" "}";
/* fragment source */
static const gchar *video_mixer_f_src =
"#ifdef GL_ES\n"
"precision mediump float;\n"
"#endif\n"
"uniform sampler2D texture; \n"
"uniform float alpha;\n"
"varying vec2 v_texCoord; \n"
"void main() \n"
"{ \n"
" vec4 rgba = texture2D( texture, v_texCoord );\n"
" gl_FragColor = vec4(rgba.rgb, rgba.a * alpha);\n"
"} \n";
/* checker vertex source */
static const gchar *checker_v_src =
"attribute vec4 a_position;\n"
"void main()\n"
"{\n"
" gl_Position = a_position;\n"
"}\n";
/* checker fragment source */
static const gchar *checker_f_src =
"#ifdef GL_ES\n"
"precision mediump float;\n"
"#endif\n"
"const float blocksize = 8.0;\n"
"void main ()\n"
"{\n"
" vec4 high = vec4(0.667, 0.667, 0.667, 1.0);\n"
" vec4 low = vec4(0.333, 0.333, 0.333, 1.0);\n"
" if (mod(gl_FragCoord.x, blocksize * 2.0) >= blocksize) {\n"
" if (mod(gl_FragCoord.y, blocksize * 2.0) >= blocksize)\n"
" gl_FragColor = low;\n"
" else\n"
" gl_FragColor = high;\n"
" } else {\n"
" if (mod(gl_FragCoord.y, blocksize * 2.0) < blocksize)\n"
" gl_FragColor = low;\n"
" else\n"
" gl_FragColor = high;\n"
" }\n"
"}\n";
/* *INDENT-ON* */
#define GST_TYPE_GL_VIDEO_MIXER_PAD (gst_gl_video_mixer_pad_get_type())
#define GST_GL_VIDEO_MIXER_PAD(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_GL_VIDEO_MIXER_PAD, GstGLVideoMixerPad))
#define GST_GL_VIDEO_MIXER_PAD_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_GL_VIDEO_MIXER_PAD, GstGLVideoMixerPadClass))
#define GST_IS_GL_VIDEO_MIXER_PAD(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_GL_VIDEO_MIXER_PAD))
#define GST_IS_GL_VIDEO_MIXER_PAD_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_GL_VIDEO_MIXER_PAD))
typedef struct _GstGLVideoMixerPad GstGLVideoMixerPad;
typedef struct _GstGLVideoMixerPadClass GstGLVideoMixerPadClass;
typedef struct _GstGLVideoMixerCollect GstGLVideoMixerCollect;
/**
* GstGLVideoMixerPad:
*
* The opaque #GstGLVideoMixerPad structure.
*/
struct _GstGLVideoMixerPad
{
GstGLMixerPad parent;
/* < private > */
/* properties */
gint xpos, ypos;
gint width, height;
gdouble alpha;
gboolean geometry_change;
GLuint vertex_buffer;
};
struct _GstGLVideoMixerPadClass
{
GstGLMixerPadClass parent_class;
};
GType gst_gl_video_mixer_pad_get_type (void);
G_DEFINE_TYPE (GstGLVideoMixerPad, gst_gl_video_mixer_pad,
GST_TYPE_GL_MIXER_PAD);
static void gst_gl_video_mixer_pad_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_gl_video_mixer_pad_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
enum
{
PROP_PAD_0,
PROP_PAD_XPOS,
PROP_PAD_YPOS,
PROP_PAD_WIDTH,
PROP_PAD_HEIGHT,
PROP_PAD_ALPHA
};
static void
gst_gl_video_mixer_pad_init (GstGLVideoMixerPad * pad)
{
pad->alpha = 1.0;
}
static void
gst_gl_video_mixer_pad_class_init (GstGLVideoMixerPadClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
gobject_class->set_property = gst_gl_video_mixer_pad_set_property;
gobject_class->get_property = gst_gl_video_mixer_pad_get_property;
g_object_class_install_property (gobject_class, PROP_PAD_XPOS,
g_param_spec_int ("xpos", "X Position", "X Position of the picture",
G_MININT, G_MAXINT, DEFAULT_PAD_XPOS,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PAD_YPOS,
g_param_spec_int ("ypos", "Y Position", "Y Position of the picture",
G_MININT, G_MAXINT, DEFAULT_PAD_YPOS,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PAD_WIDTH,
g_param_spec_int ("width", "Width", "Width of the picture",
G_MININT, G_MAXINT, DEFAULT_PAD_WIDTH,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PAD_HEIGHT,
g_param_spec_int ("height", "Height", "Height of the picture",
G_MININT, G_MAXINT, DEFAULT_PAD_HEIGHT,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PAD_ALPHA,
g_param_spec_double ("alpha", "Alpha", "Alpha of the picture", 0.0, 1.0,
DEFAULT_PAD_ALPHA,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
}
static void
gst_gl_video_mixer_pad_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstGLVideoMixerPad *pad = GST_GL_VIDEO_MIXER_PAD (object);
switch (prop_id) {
case PROP_PAD_XPOS:
g_value_set_int (value, pad->xpos);
break;
case PROP_PAD_YPOS:
g_value_set_int (value, pad->ypos);
break;
case PROP_PAD_WIDTH:
g_value_set_int (value, pad->width);
break;
case PROP_PAD_HEIGHT:
g_value_set_int (value, pad->height);
break;
case PROP_PAD_ALPHA:
g_value_set_double (value, pad->alpha);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_gl_video_mixer_pad_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstGLVideoMixerPad *pad = GST_GL_VIDEO_MIXER_PAD (object);
GstGLMixer *mix = GST_GL_MIXER (gst_pad_get_parent (GST_PAD (pad)));
switch (prop_id) {
case PROP_PAD_XPOS:
pad->xpos = g_value_get_int (value);
pad->geometry_change = TRUE;
break;
case PROP_PAD_YPOS:
pad->ypos = g_value_get_int (value);
pad->geometry_change = TRUE;
break;
case PROP_PAD_WIDTH:
pad->width = g_value_get_int (value);
pad->geometry_change = TRUE;
break;
case PROP_PAD_HEIGHT:
pad->height = g_value_get_int (value);
pad->geometry_change = TRUE;
break;
case PROP_PAD_ALPHA:
pad->alpha = g_value_get_double (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
gst_object_unref (mix);
}
static void
gst_gl_video_mixer_class_init (GstGLVideoMixerClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class;
GstAggregatorClass *agg_class = (GstAggregatorClass *) klass;
GstVideoAggregatorClass *vagg_class = (GstVideoAggregatorClass *) klass;
gobject_class = (GObjectClass *) klass;
element_class = GST_ELEMENT_CLASS (klass);
gobject_class->set_property = gst_gl_video_mixer_set_property;
gobject_class->get_property = gst_gl_video_mixer_get_property;
gst_element_class_set_metadata (element_class, "OpenGL video_mixer",
"Filter/Effect/Video/Compositor", "OpenGL video_mixer",
"Matthew Waters <matthew@centricular.com>");
g_object_class_install_property (gobject_class, PROP_BACKGROUND,
g_param_spec_enum ("background", "Background", "Background type",
GST_GL_TYPE_VIDEO_MIXER_BACKGROUND,
DEFAULT_BACKGROUND, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
GST_GL_MIXER_CLASS (klass)->set_caps = gst_gl_video_mixer_init_shader;
GST_GL_MIXER_CLASS (klass)->reset = gst_gl_video_mixer_reset;
GST_GL_MIXER_CLASS (klass)->process_textures =
gst_gl_video_mixer_process_textures;
vagg_class->update_caps = _update_caps;
agg_class->sinkpads_type = GST_TYPE_GL_VIDEO_MIXER_PAD;
GST_GL_BASE_MIXER_CLASS (klass)->supported_gl_api =
GST_GL_API_OPENGL | GST_GL_API_OPENGL3 | GST_GL_API_GLES2;
}
static void
gst_gl_video_mixer_init (GstGLVideoMixer * video_mixer)
{
video_mixer->background = DEFAULT_BACKGROUND;
video_mixer->shader = NULL;
video_mixer->input_frames = NULL;
}
static void
gst_gl_video_mixer_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstGLVideoMixer *mixer = GST_GL_VIDEO_MIXER (object);
switch (prop_id) {
case PROP_BACKGROUND:
mixer->background = g_value_get_enum (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_gl_video_mixer_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstGLVideoMixer *mixer = GST_GL_VIDEO_MIXER (object);
switch (prop_id) {
case PROP_BACKGROUND:
g_value_set_enum (value, mixer->background);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstCaps *
_update_caps (GstVideoAggregator * vagg, GstCaps * caps)
{
GList *l;
gint best_width = -1, best_height = -1;
GstVideoInfo info;
GstCaps *ret = NULL;
int i;
caps = gst_caps_make_writable (caps);
gst_video_info_from_caps (&info, caps);
GST_OBJECT_LOCK (vagg);
for (l = GST_ELEMENT (vagg)->sinkpads; l; l = l->next) {
GstVideoAggregatorPad *vaggpad = l->data;
GstGLVideoMixerPad *mixer_pad = GST_GL_VIDEO_MIXER_PAD (vaggpad);
gint this_width, this_height;
gint width, height;
if (mixer_pad->width > 0)
width = mixer_pad->width;
else
width = GST_VIDEO_INFO_WIDTH (&vaggpad->info);
if (mixer_pad->height > 0)
height = mixer_pad->height;
else
height = GST_VIDEO_INFO_HEIGHT (&vaggpad->info);
if (width == 0 || height == 0)
continue;
this_width = width + MAX (mixer_pad->xpos, 0);
this_height = height + MAX (mixer_pad->ypos, 0);
if (best_width < this_width)
best_width = this_width;
if (best_height < this_height)
best_height = this_height;
}
GST_OBJECT_UNLOCK (vagg);
ret =
GST_VIDEO_AGGREGATOR_CLASS (gst_gl_video_mixer_parent_class)->update_caps
(vagg, caps);
for (i = 0; i < gst_caps_get_size (ret); i++) {
GstStructure *s = gst_caps_get_structure (ret, i);
gst_structure_set (s, "width", G_TYPE_INT, best_width, "height", G_TYPE_INT,
best_height, NULL);
}
return ret;
}
static gboolean
_reset_pad_gl (GstAggregator * agg, GstAggregatorPad * aggpad, gpointer udata)
{
const GstGLFuncs *gl = GST_GL_BASE_MIXER (agg)->context->gl_vtable;
GstGLVideoMixerPad *pad = GST_GL_VIDEO_MIXER_PAD (aggpad);
if (pad->vertex_buffer) {
gl->DeleteBuffers (1, &pad->vertex_buffer);
pad->vertex_buffer = 0;
}
return FALSE;
}
static void
_reset_gl (GstGLContext * context, GstGLVideoMixer * video_mixer)
{
const GstGLFuncs *gl = GST_GL_BASE_MIXER (video_mixer)->context->gl_vtable;
if (video_mixer->vao) {
gl->DeleteVertexArrays (1, &video_mixer->vao);
video_mixer->vao = 0;
}
gst_aggregator_iterate_sinkpads (GST_AGGREGATOR (video_mixer), _reset_pad_gl,
NULL);
}
static void
gst_gl_video_mixer_reset (GstGLMixer * mixer)
{
GstGLVideoMixer *video_mixer = GST_GL_VIDEO_MIXER (mixer);
GstGLContext *context = GST_GL_BASE_MIXER (mixer)->context;
video_mixer->input_frames = NULL;
GST_DEBUG_OBJECT (mixer, "context:%p", context);
if (video_mixer->shader)
gst_gl_context_del_shader (context, video_mixer->shader);
video_mixer->shader = NULL;
if (video_mixer->checker)
gst_gl_context_del_shader (context, video_mixer->checker);
video_mixer->checker = NULL;
if (GST_GL_BASE_MIXER (mixer)->context)
gst_gl_context_thread_add (context, (GstGLContextThreadFunc) _reset_gl,
mixer);
}
static gboolean
gst_gl_video_mixer_init_shader (GstGLMixer * mixer, GstCaps * outcaps)
{
GstGLVideoMixer *video_mixer = GST_GL_VIDEO_MIXER (mixer);
if (video_mixer->shader)
gst_gl_context_del_shader (GST_GL_BASE_MIXER (mixer)->context,
video_mixer->shader);
return gst_gl_context_gen_shader (GST_GL_BASE_MIXER (mixer)->context,
video_mixer_v_src, video_mixer_f_src, &video_mixer->shader);
}
static gboolean
gst_gl_video_mixer_process_textures (GstGLMixer * mix, GPtrArray * frames,
guint out_tex)
{
GstGLVideoMixer *video_mixer = GST_GL_VIDEO_MIXER (mix);
video_mixer->input_frames = frames;
gst_gl_context_use_fbo_v2 (GST_GL_BASE_MIXER (mix)->context,
GST_VIDEO_INFO_WIDTH (&GST_VIDEO_AGGREGATOR (mix)->info),
GST_VIDEO_INFO_HEIGHT (&GST_VIDEO_AGGREGATOR (mix)->info),
mix->fbo, mix->depthbuffer,
out_tex, gst_gl_video_mixer_callback, (gpointer) video_mixer);
return TRUE;
}
static gboolean
_draw_checker_background (GstGLVideoMixer * video_mixer)
{
GstGLMixer *mixer = GST_GL_MIXER (video_mixer);
const GstGLFuncs *gl = GST_GL_BASE_MIXER (mixer)->context->gl_vtable;
gint attr_position_loc = 0;
const GLushort indices[] = {
0, 1, 2,
0, 2, 3
};
/* *INDENT-OFF* */
gfloat v_vertices[] = {
-1.0,-1.0,-1.0f,
1.0,-1.0,-1.0f,
1.0, 1.0,-1.0f,
-1.0, 1.0,-1.0f,
};
/* *INDENT-ON* */
if (!video_mixer->checker) {
if (!gst_gl_context_gen_shader (GST_GL_BASE_MIXER (mixer)->context,
checker_v_src, checker_f_src, &video_mixer->checker))
return FALSE;
}
gst_gl_shader_use (video_mixer->checker);
attr_position_loc =
gst_gl_shader_get_attribute_location (video_mixer->checker, "a_position");
if (!video_mixer->checker_vbo) {
gl->GenBuffers (1, &video_mixer->checker_vbo);
gl->BindBuffer (GL_ARRAY_BUFFER, video_mixer->checker_vbo);
gl->BufferData (GL_ARRAY_BUFFER, 4 * 3 * sizeof (GLfloat), v_vertices,
GL_STATIC_DRAW);
} else {
gl->BindBuffer (GL_ARRAY_BUFFER, video_mixer->checker_vbo);
}
gl->VertexAttribPointer (attr_position_loc, 3, GL_FLOAT,
GL_FALSE, 3 * sizeof (GLfloat), (void *) 0);
gl->EnableVertexAttribArray (attr_position_loc);
gl->DrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices);
gl->DisableVertexAttribArray (attr_position_loc);
gl->BindBuffer (GL_ARRAY_BUFFER, 0);
return TRUE;
}
static gboolean
_draw_background (GstGLVideoMixer * video_mixer)
{
GstGLMixer *mixer = GST_GL_MIXER (video_mixer);
const GstGLFuncs *gl = GST_GL_BASE_MIXER (mixer)->context->gl_vtable;
switch (video_mixer->background) {
case GST_GL_VIDEO_MIXER_BACKGROUND_BLACK:
gl->ClearColor (0.0, 0.0, 0.0, 1.0);
gl->Clear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
break;
case GST_GL_VIDEO_MIXER_BACKGROUND_WHITE:
gl->ClearColor (1.0, 1.0, 1.0, 1.0);
gl->Clear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
break;
case GST_GL_VIDEO_MIXER_BACKGROUND_TRANSPARENT:
gl->ClearColor (0.0, 0.0, 0.0, 0.0);
gl->Clear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
break;
case GST_GL_VIDEO_MIXER_BACKGROUND_CHECKER:
return _draw_checker_background (video_mixer);
break;
default:
break;
}
return TRUE;
}
/* opengl scene, params: input texture (not the output mixer->texture) */
static void
gst_gl_video_mixer_callback (gpointer stuff)
{
GstGLVideoMixer *video_mixer = GST_GL_VIDEO_MIXER (stuff);
GstGLMixer *mixer = GST_GL_MIXER (video_mixer);
GstGLFuncs *gl = GST_GL_BASE_MIXER (mixer)->context->gl_vtable;
GLint attr_position_loc = 0;
GLint attr_texture_loc = 0;
guint out_width, out_height;
const GLushort indices[] = {
0, 1, 2,
0, 2, 3
};
guint count = 0;
out_width = GST_VIDEO_INFO_WIDTH (&GST_VIDEO_AGGREGATOR (stuff)->info);
out_height = GST_VIDEO_INFO_HEIGHT (&GST_VIDEO_AGGREGATOR (stuff)->info);
gst_gl_context_clear_shader (GST_GL_BASE_MIXER (mixer)->context);
gl->BindTexture (GL_TEXTURE_2D, 0);
if (gst_gl_context_get_gl_api (GST_GL_BASE_MIXER (mixer)->context) &
GST_GL_API_OPENGL)
gl->Disable (GL_TEXTURE_2D);
gl->Disable (GL_DEPTH_TEST);
gl->Disable (GL_CULL_FACE);
if (gl->GenVertexArrays) {
if (!video_mixer->vao)
gl->GenVertexArrays (1, &video_mixer->vao);
gl->BindVertexArray (video_mixer->vao);
}
if (!_draw_background (video_mixer))
return;
gst_gl_shader_use (video_mixer->shader);
attr_position_loc =
gst_gl_shader_get_attribute_location (video_mixer->shader, "a_position");
attr_texture_loc =
gst_gl_shader_get_attribute_location (video_mixer->shader, "a_texCoord");
gl->Enable (GL_BLEND);
while (count < video_mixer->input_frames->len) {
GstGLMixerFrameData *frame;
GstGLVideoMixerPad *pad;
guint in_tex;
guint in_width, in_height;
/* *INDENT-OFF* */
gfloat v_vertices[] = {
-1.0,-1.0,-1.0f, 0.0f, 0.0f,
1.0,-1.0,-1.0f, 1.0f, 0.0f,
1.0, 1.0,-1.0f, 1.0f, 1.0f,
-1.0, 1.0,-1.0f, 0.0f, 1.0f,
};
/* *INDENT-ON* */
frame = g_ptr_array_index (video_mixer->input_frames, count);
if (!frame) {
GST_DEBUG ("skipping texture, null frame");
count++;
continue;
}
pad = (GstGLVideoMixerPad *) frame->pad;
in_width = GST_VIDEO_INFO_WIDTH (&GST_VIDEO_AGGREGATOR_PAD (pad)->info);
in_height = GST_VIDEO_INFO_HEIGHT (&GST_VIDEO_AGGREGATOR_PAD (pad)->info);
if (!frame->texture || in_width <= 0 || in_height <= 0
|| pad->alpha == 0.0f) {
GST_DEBUG ("skipping texture:%u frame:%p width:%u height:%u alpha:%f",
frame->texture, frame, in_width, in_height, pad->alpha);
count++;
continue;
}
in_tex = frame->texture;
if (pad->geometry_change || !pad->vertex_buffer) {
guint pad_width, pad_height;
gfloat w, h;
pad_width = pad->width <= 0 ? in_width : pad->width;
pad_height = pad->height <= 0 ? in_height : pad->height;
w = ((gfloat) pad_width / (gfloat) out_width);
h = ((gfloat) pad_height / (gfloat) out_height);
/* top-left */
v_vertices[0] = v_vertices[15] =
2.0f * (gfloat) pad->xpos / (gfloat) out_width - 1.0f;
/* bottom-left */
v_vertices[1] = v_vertices[6] =
2.0f * (gfloat) pad->ypos / (gfloat) out_height - 1.0f;
/* top-right */
v_vertices[5] = v_vertices[10] = v_vertices[0] + 2.0f * w;
/* bottom-right */
v_vertices[11] = v_vertices[16] = v_vertices[1] + 2.0f * h;
GST_TRACE ("processing texture:%u dimensions:%ux%u, at %f,%f %fx%f with "
"alpha:%f", in_tex, in_width, in_height, v_vertices[0], v_vertices[1],
v_vertices[5], v_vertices[11], pad->alpha);
if (!pad->vertex_buffer)
gl->GenBuffers (1, &pad->vertex_buffer);
gl->BindBuffer (GL_ARRAY_BUFFER, pad->vertex_buffer);
gl->BufferData (GL_ARRAY_BUFFER, 4 * 5 * sizeof (GLfloat), v_vertices,
GL_STATIC_DRAW);
} else {
gl->BindBuffer (GL_ARRAY_BUFFER, pad->vertex_buffer);
}
gl->BlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
gl->BlendEquation (GL_FUNC_ADD);
gl->ActiveTexture (GL_TEXTURE0);
gl->BindTexture (GL_TEXTURE_2D, in_tex);
gst_gl_shader_set_uniform_1i (video_mixer->shader, "texture", 0);
gst_gl_shader_set_uniform_1f (video_mixer->shader, "alpha", pad->alpha);
gl->EnableVertexAttribArray (attr_position_loc);
gl->EnableVertexAttribArray (attr_texture_loc);
gl->VertexAttribPointer (attr_position_loc, 3, GL_FLOAT,
GL_FALSE, 5 * sizeof (GLfloat), (void *) 0);
gl->VertexAttribPointer (attr_texture_loc, 2, GL_FLOAT,
GL_FALSE, 5 * sizeof (GLfloat), (void *) (3 * sizeof (GLfloat)));
gl->DrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices);
++count;
}
gl->DisableVertexAttribArray (attr_position_loc);
gl->DisableVertexAttribArray (attr_texture_loc);
if (gl->GenVertexArrays)
gl->BindVertexArray (0);
gl->BindBuffer (GL_ARRAY_BUFFER, 0);
gl->BindTexture (GL_TEXTURE_2D, 0);
gl->Disable (GL_BLEND);
gst_gl_context_clear_shader (GST_GL_BASE_MIXER (mixer)->context);
}
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