gstreamer/gst/gl/gstglimagesink.c

751 lines
23 KiB
C

/*
* GStreamer
* Copyright (C) 2003 Julien Moutte <julien@moutte.net>
* Copyright (C) 2005,2006,2007 David A. Schleef <ds@schleef.org>
* Copyright (C) 2008 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-glimagesink
*
* glimagesink renders video frames to a drawable on a local or remote
* display using OpenGL. This element can receive a Window ID from the
* application through the VideoOverlay interface and will then render video
* frames in this drawable.
* If no Window ID was provided by the application, the element will
* create its own internal window and render into it.
*
* <refsect2>
* <title>Scaling</title>
* <para>
* Depends on the driver, OpenGL handles hardware accelerated
* scaling of video frames. This means that the element will just accept
* incoming video frames no matter their geometry and will then put them to the
* drawable scaling them on the fly. Using the #GstGLImageSink:force-aspect-ratio
* property it is possible to enforce scaling with a constant aspect ratio,
* which means drawing black borders around the video frame.
* </para>
* </refsect2>
* <refsect2>
* <title>Events</title>
* <para>
* Through the gl thread, glimagesink handle some events coming from the drawable
* to manage its appearance even when the data is not flowing (GST_STATE_PAUSED).
* That means that even when the element is paused, it will receive expose events
* from the drawable and draw the latest frame with correct borders/aspect-ratio.
* </para>
* </refsect2>
* <refsect2>
* <title>Examples</title>
* |[
* gst-launch -v videotestsrc ! "video/x-raw-rgb" ! glimagesink
* ]| A pipeline to test hardware scaling.
* No special opengl extension is used in this pipeline, that's why it should work
* with OpenGL >= 1.1. That's the case if you are using the MESA3D driver v1.3.
* |[
* gst-launch -v videotestsrc ! "video/x-raw-yuv, format=(fourcc)I420" ! glimagesink
* ]| A pipeline to test hardware scaling and hardware colorspace conversion.
* When your driver supports GLSL (OpenGL Shading Language needs OpenGL >= 2.1),
* the 4 following format YUY2, UYVY, I420, YV12 and AYUV are converted to RGB32
* through some fragment shaders and using one framebuffer (FBO extension OpenGL >= 1.4).
* If your driver does not support GLSL but supports MESA_YCbCr extension then
* the you can use YUY2 and UYVY. In this case the colorspace conversion is automatically
* made when loading the texture and therefore no framebuffer is used.
* |[
* gst-launch -v gltestsrc ! glimagesink
* ]| A pipeline 100% OpenGL.
* No special opengl extension is used in this pipeline, that's why it should work
* with OpenGL >= 1.1. That's the case if you are using the MESA3D driver v1.3.
* |[
* gst-plugins-gl/tests/examples/generic/cube
* ]| The graphic FPS scene can be greater than the input video FPS.
* The graphic scene can be written from a client code through the
* two glfilterapp properties.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/video/videooverlay.h>
#include "gstglimagesink.h"
GST_DEBUG_CATEGORY (gst_debug_glimage_sink);
#define GST_CAT_DEFAULT gst_debug_glimage_sink
static void gst_glimage_sink_finalize (GObject * object);
static void gst_glimage_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * param_spec);
static void gst_glimage_sink_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * param_spec);
static gboolean gst_glimage_sink_query (GstBaseSink * bsink, GstQuery * query);
static GstStateChangeReturn
gst_glimage_sink_change_state (GstElement * element, GstStateChange transition);
static void gst_glimage_sink_get_times (GstBaseSink * bsink, GstBuffer * buf,
GstClockTime * start, GstClockTime * end);
static gboolean gst_glimage_sink_set_caps (GstBaseSink * bsink, GstCaps * caps);
static GstFlowReturn gst_glimage_sink_render (GstBaseSink * bsink,
GstBuffer * buf);
static gboolean gst_glimage_sink_propose_allocation (GstBaseSink * bsink,
GstQuery * query);
static void gst_glimage_sink_video_overlay_init (GstVideoOverlayInterface *
iface);
static void gst_glimage_sink_set_window_handle (GstVideoOverlay * overlay,
guintptr id);
static void gst_glimage_sink_expose (GstVideoOverlay * overlay);
static GstStaticPadTemplate gst_glimage_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_GL_UPLOAD_VIDEO_CAPS)
);
enum
{
ARG_0,
ARG_DISPLAY,
PROP_CLIENT_RESHAPE_CALLBACK,
PROP_CLIENT_DRAW_CALLBACK,
PROP_CLIENT_DATA,
PROP_FORCE_ASPECT_RATIO,
PROP_PIXEL_ASPECT_RATIO
};
#define gst_glimage_sink_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstGLImageSink, gst_glimage_sink,
GST_TYPE_VIDEO_SINK, G_IMPLEMENT_INTERFACE (GST_TYPE_VIDEO_OVERLAY,
gst_glimage_sink_video_overlay_init);
GST_DEBUG_CATEGORY_INIT (gst_debug_glimage_sink, "glimagesink", 0,
"OpenGL Video Sink"));
static void
gst_glimage_sink_class_init (GstGLImageSinkClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstBaseSinkClass *gstbasesink_class;
GstElementClass *element_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstbasesink_class = (GstBaseSinkClass *) klass;
element_class = GST_ELEMENT_CLASS (klass);
gobject_class->set_property = gst_glimage_sink_set_property;
gobject_class->get_property = gst_glimage_sink_get_property;
g_object_class_install_property (gobject_class, ARG_DISPLAY,
g_param_spec_string ("display", "Display", "Display name",
NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_CLIENT_RESHAPE_CALLBACK,
g_param_spec_pointer ("client-reshape-callback",
"Client reshape callback",
"Define a custom reshape callback in a client code",
G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_CLIENT_DRAW_CALLBACK,
g_param_spec_pointer ("client-draw-callback", "Client draw callback",
"Define a custom draw callback in a client code",
G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_CLIENT_DATA,
g_param_spec_pointer ("client-data", "Client data",
"Pass data to the draw and reshape callbacks",
G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_FORCE_ASPECT_RATIO,
g_param_spec_boolean ("force-aspect-ratio",
"Force aspect ratio",
"When enabled, scaling will respect original aspect ratio", FALSE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PIXEL_ASPECT_RATIO,
g_param_spec_string ("pixel-aspect-ratio", "Pixel Aspect Ratio",
"The pixel aspect ratio of the device", "1/1",
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_set_metadata (element_class, "OpenGL video sink",
"Sink/Video", "A videosink based on OpenGL",
"Julien Isorce <julien.isorce@gmail.com>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_glimage_sink_template));
gobject_class->finalize = gst_glimage_sink_finalize;
gstelement_class->change_state = gst_glimage_sink_change_state;
gstbasesink_class->query = GST_DEBUG_FUNCPTR (gst_glimage_sink_query);
gstbasesink_class->set_caps = gst_glimage_sink_set_caps;
gstbasesink_class->get_times = gst_glimage_sink_get_times;
gstbasesink_class->preroll = gst_glimage_sink_render;
gstbasesink_class->render = gst_glimage_sink_render;
gstbasesink_class->propose_allocation = gst_glimage_sink_propose_allocation;
}
static void
gst_glimage_sink_init (GstGLImageSink * glimage_sink)
{
glimage_sink->display_name = NULL;
glimage_sink->window_id = 0;
glimage_sink->new_window_id = 0;
glimage_sink->display = NULL;
glimage_sink->stored_buffer = NULL;
glimage_sink->clientReshapeCallback = NULL;
glimage_sink->clientDrawCallback = NULL;
glimage_sink->client_data = NULL;
glimage_sink->keep_aspect_ratio = FALSE;
glimage_sink->par = NULL;
}
static void
gst_glimage_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstGLImageSink *glimage_sink;
g_return_if_fail (GST_IS_GLIMAGE_SINK (object));
glimage_sink = GST_GLIMAGE_SINK (object);
switch (prop_id) {
case ARG_DISPLAY:
{
g_free (glimage_sink->display_name);
glimage_sink->display_name = g_strdup (g_value_get_string (value));
break;
}
case PROP_CLIENT_RESHAPE_CALLBACK:
{
glimage_sink->clientReshapeCallback = g_value_get_pointer (value);
break;
}
case PROP_CLIENT_DRAW_CALLBACK:
{
glimage_sink->clientDrawCallback = g_value_get_pointer (value);
break;
}
case PROP_CLIENT_DATA:
{
glimage_sink->client_data = g_value_get_pointer (value);
break;
}
case PROP_FORCE_ASPECT_RATIO:
{
glimage_sink->keep_aspect_ratio = g_value_get_boolean (value);
break;
}
case PROP_PIXEL_ASPECT_RATIO:
{
g_free (glimage_sink->par);
glimage_sink->par = g_new0 (GValue, 1);
g_value_init (glimage_sink->par, GST_TYPE_FRACTION);
if (!g_value_transform (value, glimage_sink->par)) {
g_warning ("Could not transform string to aspect ratio");
gst_value_set_fraction (glimage_sink->par, 1, 1);
}
break;
}
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_glimage_sink_finalize (GObject * object)
{
GstGLImageSink *glimage_sink;
g_return_if_fail (GST_IS_GLIMAGE_SINK (object));
glimage_sink = GST_GLIMAGE_SINK (object);
if (glimage_sink->par) {
g_free (glimage_sink->par);
glimage_sink->par = NULL;
}
g_free (glimage_sink->display_name);
GST_DEBUG ("finalized");
}
static void
gst_glimage_sink_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstGLImageSink *glimage_sink;
g_return_if_fail (GST_IS_GLIMAGE_SINK (object));
glimage_sink = GST_GLIMAGE_SINK (object);
switch (prop_id) {
case ARG_DISPLAY:
g_value_set_string (value, glimage_sink->display_name);
break;
case PROP_FORCE_ASPECT_RATIO:
g_value_set_boolean (value, glimage_sink->keep_aspect_ratio);
break;
case PROP_PIXEL_ASPECT_RATIO:
if (!glimage_sink->par) {
glimage_sink->par = g_new0 (GValue, 1);
g_value_init (glimage_sink->par, GST_TYPE_FRACTION);
gst_value_set_fraction (glimage_sink->par, 1, 1);
}
if (!g_value_transform (glimage_sink->par, value))
g_warning ("Could not transform string to aspect ratio");
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_glimage_sink_query (GstBaseSink * bsink, GstQuery * query)
{
GstGLImageSink *glimage_sink = GST_GLIMAGE_SINK (bsink);
gboolean res = FALSE;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CUSTOM:
{
GstStructure *structure = gst_query_writable_structure (query);
if (gst_structure_has_name (structure, "gstgldisplay")) {
gst_structure_set (structure, "gstgldisplay", G_TYPE_POINTER,
glimage_sink->display, NULL);
res = TRUE;
} else
res = GST_BASE_SINK_CLASS (parent_class)->query (bsink, query);
break;
}
default:
res = GST_BASE_SINK_CLASS (parent_class)->query (bsink, query);
break;
}
return res;
}
/*
* GstElement methods
*/
static GstStateChangeReturn
gst_glimage_sink_change_state (GstElement * element, GstStateChange transition)
{
GstGLImageSink *glimage_sink;
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
GST_DEBUG ("change state");
glimage_sink = GST_GLIMAGE_SINK (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
if (!glimage_sink->display) {
gboolean ok = FALSE;
GST_INFO ("Creating GstGLDisplay");
glimage_sink->display = gst_gl_display_new ();
/* init opengl context */
ok = gst_gl_display_create_context (glimage_sink->display, 0);
if (!ok) {
GST_ELEMENT_ERROR (glimage_sink, RESOURCE, NOT_FOUND,
GST_GL_DISPLAY_ERR_MSG (glimage_sink->display), (NULL));
if (glimage_sink->display) {
g_object_unref (glimage_sink->display);
glimage_sink->display = NULL;
}
return GST_STATE_CHANGE_FAILURE;
}
}
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (ret == GST_STATE_CHANGE_FAILURE)
return ret;
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
{
if (glimage_sink->stored_buffer) {
gst_buffer_unref (GST_BUFFER_CAST (glimage_sink->stored_buffer));
glimage_sink->stored_buffer = NULL;
}
if (glimage_sink->display) {
g_object_unref (glimage_sink->display);
glimage_sink->display = NULL;
}
glimage_sink->window_id = 0;
//but do not reset glimage_sink->new_window_id
GST_VIDEO_SINK_WIDTH (glimage_sink) = 1;
GST_VIDEO_SINK_HEIGHT (glimage_sink) = 1;
}
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}
static void
gst_glimage_sink_get_times (GstBaseSink * bsink, GstBuffer * buf,
GstClockTime * start, GstClockTime * end)
{
GstGLImageSink *glimagesink;
glimagesink = GST_GLIMAGE_SINK (bsink);
if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
*start = GST_BUFFER_TIMESTAMP (buf);
if (GST_BUFFER_DURATION_IS_VALID (buf))
*end = *start + GST_BUFFER_DURATION (buf);
else {
if (GST_VIDEO_INFO_FPS_N (&glimagesink->info) > 0) {
*end = *start +
gst_util_uint64_scale_int (GST_SECOND,
GST_VIDEO_INFO_FPS_D (&glimagesink->info),
GST_VIDEO_INFO_FPS_N (&glimagesink->info));
}
}
}
}
static gboolean
gst_glimage_sink_set_caps (GstBaseSink * bsink, GstCaps * caps)
{
GstGLImageSink *glimage_sink;
gint width;
gint height;
gboolean ok;
gint par_n, par_d;
gint display_par_n, display_par_d;
guint display_ratio_num, display_ratio_den;
GstVideoInfo vinfo;
GST_DEBUG ("set caps with %" GST_PTR_FORMAT, caps);
glimage_sink = GST_GLIMAGE_SINK (bsink);
ok = gst_video_info_from_caps (&vinfo, caps);
if (!ok)
return FALSE;
width = GST_VIDEO_INFO_WIDTH (&vinfo);
height = GST_VIDEO_INFO_HEIGHT (&vinfo);
if (glimage_sink->tex_id)
gst_gl_display_del_texture (glimage_sink->display, &glimage_sink->tex_id);
gst_gl_display_gen_texture (glimage_sink->display, &glimage_sink->tex_id,
GST_VIDEO_INFO_FORMAT (&vinfo), width, height);
glimage_sink->upload = gst_gl_display_find_upload (glimage_sink->display,
GST_VIDEO_INFO_FORMAT (&vinfo), width, height, width, height);
gst_gl_upload_init_format (glimage_sink->upload,
GST_VIDEO_INFO_FORMAT (&vinfo), width, height, width, height);
gst_gl_display_set_client_reshape_callback (glimage_sink->display,
glimage_sink->clientReshapeCallback);
gst_gl_display_set_client_draw_callback (glimage_sink->display,
glimage_sink->clientDrawCallback);
gst_gl_display_set_client_data (glimage_sink->display,
glimage_sink->client_data);
par_n = GST_VIDEO_INFO_PAR_N (&vinfo);
par_d = GST_VIDEO_INFO_PAR_D (&vinfo);
if (!par_n)
par_n = 1;
/* get display's PAR */
if (glimage_sink->par) {
display_par_n = gst_value_get_fraction_numerator (glimage_sink->par);
display_par_d = gst_value_get_fraction_denominator (glimage_sink->par);
} else {
display_par_n = 1;
display_par_d = 1;
}
ok = gst_video_calculate_display_ratio (&display_ratio_num,
&display_ratio_den, width, height, par_n, par_d, display_par_n,
display_par_d);
if (!ok)
return FALSE;
GST_TRACE ("PAR: %u/%u DAR:%u/%u", par_n, par_d, display_par_n,
display_par_d);
if (height % display_ratio_den == 0) {
GST_DEBUG ("keeping video height");
GST_VIDEO_SINK_WIDTH (glimage_sink) = (guint)
gst_util_uint64_scale_int (height, display_ratio_num,
display_ratio_den);
GST_VIDEO_SINK_HEIGHT (glimage_sink) = height;
} else if (width % display_ratio_num == 0) {
GST_DEBUG ("keeping video width");
GST_VIDEO_SINK_WIDTH (glimage_sink) = width;
GST_VIDEO_SINK_HEIGHT (glimage_sink) = (guint)
gst_util_uint64_scale_int (width, display_ratio_den, display_ratio_num);
} else {
GST_DEBUG ("approximating while keeping video height");
GST_VIDEO_SINK_WIDTH (glimage_sink) = (guint)
gst_util_uint64_scale_int (height, display_ratio_num,
display_ratio_den);
GST_VIDEO_SINK_HEIGHT (glimage_sink) = height;
}
GST_DEBUG ("scaling to %dx%d", GST_VIDEO_SINK_WIDTH (glimage_sink),
GST_VIDEO_SINK_HEIGHT (glimage_sink));
glimage_sink->info = vinfo;
if (!glimage_sink->window_id && !glimage_sink->new_window_id)
gst_video_overlay_prepare_window_handle (GST_VIDEO_OVERLAY (glimage_sink));
return TRUE;
}
static GstFlowReturn
gst_glimage_sink_render (GstBaseSink * bsink, GstBuffer * buf)
{
GstGLImageSink *glimage_sink;
guint tex_id;
GstVideoFrame frame;
GST_TRACE ("rendering buffer:%p", buf);
glimage_sink = GST_GLIMAGE_SINK (bsink);
if (GST_VIDEO_SINK_WIDTH (glimage_sink) < 1 ||
GST_VIDEO_SINK_HEIGHT (glimage_sink) < 1) {
return GST_FLOW_NOT_NEGOTIATED;
}
if (!gst_video_frame_map (&frame, &glimage_sink->info, buf,
GST_MAP_READ | GST_MAP_GL)) {
GST_WARNING ("Failed to map memory");
return GST_FLOW_ERROR;
}
if (frame.map[0].memory && gst_is_gl_memory (frame.map[0].memory)) {
tex_id = *(guint *) frame.data[0];
} else {
GST_INFO ("Input Buffer does not contain correct meta, "
"attempting to wrap for upload");
gst_gl_upload_perform_with_data (glimage_sink->upload,
glimage_sink->tex_id, frame.data);
tex_id = glimage_sink->tex_id;
}
if (glimage_sink->window_id != glimage_sink->new_window_id) {
glimage_sink->window_id = glimage_sink->new_window_id;
gst_gl_display_set_window_id (glimage_sink->display,
glimage_sink->window_id);
}
//the buffer is cleared when an other comes in
if (glimage_sink->stored_buffer) {
gst_buffer_unref (glimage_sink->stored_buffer);
}
//store current buffer
glimage_sink->stored_buffer = gst_buffer_ref (buf);
GST_TRACE ("redisplay texture:%u of size:%ux%u, window size:%ux%u", tex_id,
GST_VIDEO_INFO_WIDTH (&glimage_sink->info),
GST_VIDEO_INFO_HEIGHT (&glimage_sink->info),
GST_VIDEO_SINK_WIDTH (glimage_sink),
GST_VIDEO_SINK_HEIGHT (glimage_sink));
//redisplay opengl scene
if (!gst_gl_display_redisplay (glimage_sink->display,
tex_id, GST_VIDEO_INFO_WIDTH (&glimage_sink->info),
GST_VIDEO_INFO_HEIGHT (&glimage_sink->info),
GST_VIDEO_SINK_WIDTH (glimage_sink),
GST_VIDEO_SINK_HEIGHT (glimage_sink),
glimage_sink->keep_aspect_ratio))
goto redisplay_failed;
GST_TRACE ("post redisplay");
gst_video_frame_unmap (&frame);
return GST_FLOW_OK;
/* ERRORS */
redisplay_failed:
{
gst_video_frame_unmap (&frame);
GST_ELEMENT_ERROR (glimage_sink, RESOURCE, NOT_FOUND,
GST_GL_DISPLAY_ERR_MSG (glimage_sink->display), (NULL));
return GST_FLOW_ERROR;
}
}
static void
gst_glimage_sink_video_overlay_init (GstVideoOverlayInterface * iface)
{
iface->set_window_handle = gst_glimage_sink_set_window_handle;
iface->expose = gst_glimage_sink_expose;
}
static void
gst_glimage_sink_set_window_handle (GstVideoOverlay * overlay, guintptr id)
{
GstGLImageSink *glimage_sink = GST_GLIMAGE_SINK (overlay);
gulong window_id = (gulong) id;
g_return_if_fail (GST_IS_GLIMAGE_SINK (overlay));
GST_DEBUG ("set_xwindow_id %ld", window_id);
glimage_sink->new_window_id = window_id;
}
static void
gst_glimage_sink_expose (GstVideoOverlay * overlay)
{
GstGLImageSink *glimage_sink = GST_GLIMAGE_SINK (overlay);
//redisplay opengl scene
if (glimage_sink->display && glimage_sink->window_id) {
if (glimage_sink->window_id != glimage_sink->new_window_id) {
glimage_sink->window_id = glimage_sink->new_window_id;
gst_gl_display_set_window_id (glimage_sink->display,
glimage_sink->window_id);
}
gst_gl_display_redisplay (glimage_sink->display, 0, 0, 0, 0, 0,
glimage_sink->keep_aspect_ratio);
}
}
static gboolean
gst_glimage_sink_propose_allocation (GstBaseSink * bsink, GstQuery * query)
{
GstGLImageSink *glimage_sink = GST_GLIMAGE_SINK (bsink);
GstBufferPool *pool;
GstStructure *config;
GstCaps *caps;
guint size;
gboolean need_pool;
gst_query_parse_allocation (query, &caps, &need_pool);
if (caps == NULL)
goto no_caps;
if ((pool = glimage_sink->pool))
gst_object_ref (pool);
if (pool != NULL) {
GstCaps *pcaps;
/* we had a pool, check caps */
GST_DEBUG_OBJECT (glimage_sink, "check existing pool caps");
config = gst_buffer_pool_get_config (pool);
gst_buffer_pool_config_get_params (config, &pcaps, &size, NULL, NULL);
if (!gst_caps_is_equal (caps, pcaps)) {
GST_DEBUG_OBJECT (glimage_sink, "pool has different caps");
/* different caps, we can't use this pool */
gst_object_unref (pool);
pool = NULL;
}
gst_structure_free (config);
}
if (pool == NULL && need_pool) {
GstVideoInfo info;
if (!gst_video_info_from_caps (&info, caps))
goto invalid_caps;
GST_DEBUG_OBJECT (glimage_sink, "create new pool");
pool = gst_gl_buffer_pool_new (glimage_sink->display);
/* the normal size of a frame */
size = info.size;
config = gst_buffer_pool_get_config (pool);
gst_buffer_pool_config_set_params (config, caps, size, 0, 0);
if (!gst_buffer_pool_set_config (pool, config))
goto config_failed;
}
/* we need at least 2 buffer because we hold on to the last one */
gst_query_add_allocation_pool (query, pool, size, 2, 0);
/* we also support various metadata */
gst_query_add_allocation_meta (query, GST_VIDEO_META_API_TYPE, 0);
gst_object_unref (pool);
return TRUE;
/* ERRORS */
no_caps:
{
GST_DEBUG_OBJECT (bsink, "no caps specified");
return FALSE;
}
invalid_caps:
{
GST_DEBUG_OBJECT (bsink, "invalid caps specified");
return FALSE;
}
config_failed:
{
GST_DEBUG_OBJECT (bsink, "failed setting config");
return FALSE;
}
}