gstreamer/subprojects/gst-plugins-base/sys/ximage/ximagepool.c

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/* GStreamer
* Copyright (C) <2005> Julien Moutte <julien@moutte.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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
/* Object header */
#include "ximagesink.h"
/* Debugging category */
#include <gst/gstinfo.h>
/* Helper functions */
#include <gst/video/video.h>
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#include <gst/video/gstvideometa.h>
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#include <gst/video/gstvideopool.h>
GST_DEBUG_CATEGORY (gst_debug_x_image_pool);
#define GST_CAT_DEFAULT gst_debug_x_image_pool
/* X11 stuff */
static gboolean error_caught = FALSE;
static int
gst_ximagesink_handle_xerror (Display * display, XErrorEvent * xevent)
{
char error_msg[1024];
XGetErrorText (display, xevent->error_code, error_msg, 1024);
GST_DEBUG ("ximagesink triggered an XError. error: %s", error_msg);
error_caught = TRUE;
return 0;
}
static GstMemory *
gst_ximage_memory_alloc (GstAllocator * allocator, gsize size,
GstAllocationParams * params)
{
return NULL;
}
static void
gst_ximage_memory_free (GstAllocator * allocator, GstMemory * gmem)
{
GstXImageMemory *mem = (GstXImageMemory *) gmem;
GstXImageSink *ximagesink;
if (gmem->parent)
goto sub_mem;
ximagesink = mem->sink;
GST_DEBUG_OBJECT (ximagesink, "free memory %p", mem);
/* Hold the object lock to ensure the XContext doesn't disappear */
GST_OBJECT_LOCK (ximagesink);
/* We might have some buffers destroyed after changing state to NULL */
if (ximagesink->xcontext == NULL) {
GST_DEBUG_OBJECT (ximagesink, "Destroying XImage after XContext");
#ifdef HAVE_XSHM
/* Need to free the shared memory segment even if the x context
* was already cleaned up */
if (mem->SHMInfo.shmaddr != ((void *) -1)) {
shmdt (mem->SHMInfo.shmaddr);
}
#endif
goto beach;
}
g_mutex_lock (&ximagesink->x_lock);
#ifdef HAVE_XSHM
if (ximagesink->xcontext->use_xshm) {
if (mem->SHMInfo.shmaddr != ((void *) -1)) {
GST_DEBUG_OBJECT (ximagesink, "XServer ShmDetaching from 0x%x id 0x%lx",
mem->SHMInfo.shmid, mem->SHMInfo.shmseg);
XShmDetach (ximagesink->xcontext->disp, &mem->SHMInfo);
XSync (ximagesink->xcontext->disp, FALSE);
shmdt (mem->SHMInfo.shmaddr);
mem->SHMInfo.shmaddr = (void *) -1;
}
if (mem->ximage)
XDestroyImage (mem->ximage);
} else
#endif /* HAVE_XSHM */
{
if (mem->ximage) {
XDestroyImage (mem->ximage);
}
}
XSync (ximagesink->xcontext->disp, FALSE);
g_mutex_unlock (&ximagesink->x_lock);
beach:
GST_OBJECT_UNLOCK (ximagesink);
gst_object_unref (mem->sink);
sub_mem:
g_free (mem);
}
static gpointer
ximage_memory_map (GstXImageMemory * mem, gsize maxsize, GstMapFlags flags)
{
return mem->ximage->data + mem->parent.offset;
}
static gboolean
ximage_memory_unmap (GstXImageMemory * mem)
{
return TRUE;
}
static GstXImageMemory *
ximage_memory_share (GstXImageMemory * mem, gssize offset, gsize size)
{
GstXImageMemory *sub;
GstMemory *parent;
/* We can only share the complete memory */
if (offset != 0)
return NULL;
if (size != -1 && size != mem->size)
return NULL;
/* find the real parent */
if ((parent = mem->parent.parent) == NULL)
parent = (GstMemory *) mem;
if (size == -1)
size = mem->parent.size - offset;
/* the shared memory is always readonly */
sub = g_new (GstXImageMemory, 1);
gst_memory_init (GST_MEMORY_CAST (sub), GST_MINI_OBJECT_FLAGS (parent) |
GST_MINI_OBJECT_FLAG_LOCK_READONLY, mem->parent.allocator,
&mem->parent, mem->parent.maxsize, mem->parent.align,
mem->parent.offset + offset, size);
sub->sink = mem->sink;
sub->ximage = mem->ximage;
#ifdef HAVE_XSHM
sub->SHMInfo = mem->SHMInfo;
#endif
sub->x = mem->x;
sub->y = mem->y;
sub->width = mem->width;
sub->height = mem->height;
return sub;
}
typedef GstAllocator GstXImageMemoryAllocator;
typedef GstAllocatorClass GstXImageMemoryAllocatorClass;
GType ximage_memory_allocator_get_type (void);
G_DEFINE_TYPE (GstXImageMemoryAllocator, ximage_memory_allocator,
GST_TYPE_ALLOCATOR);
#define GST_XIMAGE_ALLOCATOR_NAME "ximage"
#define GST_TYPE_XIMAGE_MEMORY_ALLOCATOR (ximage_memory_allocator_get_type())
#define GST_IS_XIMAGE_MEMORY_ALLOCATOR(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_XIMAGE_MEMORY_ALLOCATOR))
static void
ximage_memory_allocator_class_init (GstXImageMemoryAllocatorClass * klass)
{
GstAllocatorClass *allocator_class;
allocator_class = (GstAllocatorClass *) klass;
allocator_class->alloc = gst_ximage_memory_alloc;
allocator_class->free = gst_ximage_memory_free;
}
static void
ximage_memory_allocator_init (GstXImageMemoryAllocator * allocator)
{
GstAllocator *alloc = GST_ALLOCATOR_CAST (allocator);
alloc->mem_type = GST_XIMAGE_ALLOCATOR_NAME;
alloc->mem_map = (GstMemoryMapFunction) ximage_memory_map;
alloc->mem_unmap = (GstMemoryUnmapFunction) ximage_memory_unmap;
alloc->mem_share = (GstMemoryShareFunction) ximage_memory_share;
/* fallback copy and is_span */
GST_OBJECT_FLAG_SET (allocator, GST_ALLOCATOR_FLAG_CUSTOM_ALLOC);
}
static GstMemory *
ximage_memory_alloc (GstXImageBufferPool * xpool)
{
GstXImageSink *ximagesink;
int (*handler) (Display *, XErrorEvent *);
gboolean success = FALSE;
GstXContext *xcontext;
gint width, height, align, offset;
GstXImageMemory *mem;
ximagesink = xpool->sink;
xcontext = ximagesink->xcontext;
width = xpool->padded_width;
height = xpool->padded_height;
mem = g_new (GstXImageMemory, 1);
#ifdef HAVE_XSHM
mem->SHMInfo.shmaddr = ((void *) -1);
mem->SHMInfo.shmid = -1;
#endif
mem->x = xpool->align.padding_left;
mem->y = xpool->align.padding_top;
mem->width = GST_VIDEO_INFO_WIDTH (&xpool->info);
mem->height = GST_VIDEO_INFO_HEIGHT (&xpool->info);
mem->sink = gst_object_ref (ximagesink);
GST_DEBUG_OBJECT (ximagesink, "creating image %p (%dx%d)", mem,
width, height);
g_mutex_lock (&ximagesink->x_lock);
/* Setting an error handler to catch failure */
error_caught = FALSE;
handler = XSetErrorHandler (gst_ximagesink_handle_xerror);
#ifdef HAVE_XSHM
if (xcontext->use_xshm) {
mem->ximage = XShmCreateImage (xcontext->disp,
xcontext->visual,
xcontext->depth, ZPixmap, NULL, &mem->SHMInfo, width, height);
if (!mem->ximage || error_caught) {
g_mutex_unlock (&ximagesink->x_lock);
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/* Reset error flag */
error_caught = FALSE;
/* Push a warning */
GST_ELEMENT_WARNING (ximagesink, RESOURCE, WRITE,
("Failed to create output image buffer of %dx%d pixels",
width, height),
("could not XShmCreateImage a %dx%d image", width, height));
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/* Retry without XShm */
ximagesink->xcontext->use_xshm = FALSE;
/* Hold X mutex again to try without XShm */
g_mutex_lock (&ximagesink->x_lock);
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goto no_xshm;
}
/* we have to use the returned bytes_per_line for our shm size */
mem->size = mem->ximage->bytes_per_line * mem->ximage->height;
GST_LOG_OBJECT (ximagesink,
"XShm image size is %" G_GSIZE_FORMAT ", width %d, stride %d",
mem->size, width, mem->ximage->bytes_per_line);
/* get shared memory */
align = 0;
mem->SHMInfo.shmid =
shmget (IPC_PRIVATE, mem->size + align, IPC_CREAT | 0777);
if (mem->SHMInfo.shmid == -1)
goto shmget_failed;
/* attach */
mem->SHMInfo.shmaddr = shmat (mem->SHMInfo.shmid, NULL, 0);
if (mem->SHMInfo.shmaddr == ((void *) -1))
goto shmat_failed;
/* now we can set up the image data */
mem->ximage->data = mem->SHMInfo.shmaddr;
mem->SHMInfo.readOnly = FALSE;
if (XShmAttach (xcontext->disp, &mem->SHMInfo) == 0)
goto xattach_failed;
XSync (xcontext->disp, FALSE);
/* Now that everyone has attached, we can delete the shared memory segment.
* This way, it will be deleted as soon as we detach later, and not
* leaked if we crash. */
shmctl (mem->SHMInfo.shmid, IPC_RMID, NULL);
GST_DEBUG_OBJECT (ximagesink, "XServer ShmAttached to 0x%x, id 0x%lx",
mem->SHMInfo.shmid, mem->SHMInfo.shmseg);
} else
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no_xshm:
#endif /* HAVE_XSHM */
{
guint allocsize;
mem->ximage = XCreateImage (xcontext->disp,
xcontext->visual,
xcontext->depth, ZPixmap, 0, NULL, width, height, xcontext->bpp, 0);
if (!mem->ximage || error_caught)
goto create_failed;
/* upstream will assume that rowstrides are multiples of 4, but this
* doesn't always seem to be the case with XCreateImage() */
if ((mem->ximage->bytes_per_line % 4) != 0) {
GST_WARNING_OBJECT (ximagesink, "returned stride not a multiple of 4 as "
"usually assumed");
}
/* we have to use the returned bytes_per_line for our image size */
mem->size = mem->ximage->bytes_per_line * mem->ximage->height;
/* alloc a bit more for unexpected strides to avoid crashes upstream.
* FIXME: if we get an unrounded stride, the image will be displayed
* distorted, since all upstream elements assume a rounded stride */
allocsize =
GST_ROUND_UP_4 (mem->ximage->bytes_per_line) * mem->ximage->height;
/* we want 16 byte aligned memory, g_malloc may only give 8 */
align = 15;
mem->ximage->data = g_malloc (allocsize + align);
GST_LOG_OBJECT (ximagesink,
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"non-XShm image size is %" G_GSIZE_FORMAT " (allocated: %u), width %d, "
"stride %d", mem->size, allocsize, width, mem->ximage->bytes_per_line);
XSync (xcontext->disp, FALSE);
}
if ((offset = ((guintptr) mem->ximage->data & align)))
offset = (align + 1) - offset;
GST_DEBUG_OBJECT (ximagesink, "memory %p, align %d, offset %d",
mem->ximage->data, align, offset);
/* Reset error handler */
error_caught = FALSE;
XSetErrorHandler (handler);
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gst_memory_init (GST_MEMORY_CAST (mem), GST_MEMORY_FLAG_NO_SHARE,
xpool->allocator, NULL, mem->size + align, align, offset, mem->size);
g_mutex_unlock (&ximagesink->x_lock);
success = TRUE;
beach:
if (!success) {
g_free (mem);
mem = NULL;
}
return GST_MEMORY_CAST (mem);
/* ERRORS */
create_failed:
{
g_mutex_unlock (&ximagesink->x_lock);
/* Reset error handler */
error_caught = FALSE;
XSetErrorHandler (handler);
/* Push an error */
GST_ELEMENT_ERROR (ximagesink, RESOURCE, WRITE,
("Failed to create output image buffer of %dx%d pixels",
width, height),
("could not XShmCreateImage a %dx%d image", width, height));
goto beach;
}
#ifdef HAVE_XSHM
shmget_failed:
{
g_mutex_unlock (&ximagesink->x_lock);
GST_ELEMENT_ERROR (ximagesink, RESOURCE, WRITE,
("Failed to create output image buffer of %dx%d pixels",
width, height),
("could not get shared memory of %" G_GSIZE_FORMAT " bytes",
mem->size));
goto beach;
}
shmat_failed:
{
g_mutex_unlock (&ximagesink->x_lock);
GST_ELEMENT_ERROR (ximagesink, RESOURCE, WRITE,
("Failed to create output image buffer of %dx%d pixels",
width, height), ("Failed to shmat: %s", g_strerror (errno)));
/* Clean up the shared memory segment */
shmctl (mem->SHMInfo.shmid, IPC_RMID, NULL);
goto beach;
}
xattach_failed:
{
/* Clean up the shared memory segment */
shmctl (mem->SHMInfo.shmid, IPC_RMID, NULL);
g_mutex_unlock (&ximagesink->x_lock);
GST_ELEMENT_ERROR (ximagesink, RESOURCE, WRITE,
("Failed to create output image buffer of %dx%d pixels",
width, height), ("Failed to XShmAttach"));
goto beach;
}
#endif
}
#ifdef HAVE_XSHM
/* This function checks that it is actually really possible to create an image
using XShm */
gboolean
gst_x_image_sink_check_xshm_calls (GstXImageSink * ximagesink,
GstXContext * xcontext)
{
XImage *ximage;
XShmSegmentInfo SHMInfo;
size_t size;
int (*handler) (Display *, XErrorEvent *);
gboolean result = FALSE;
gboolean did_attach = FALSE;
g_return_val_if_fail (xcontext != NULL, FALSE);
/* Sync to ensure any older errors are already processed */
XSync (xcontext->disp, FALSE);
/* Set defaults so we don't free these later unnecessarily */
SHMInfo.shmaddr = ((void *) -1);
SHMInfo.shmid = -1;
/* Setting an error handler to catch failure */
error_caught = FALSE;
handler = XSetErrorHandler (gst_ximagesink_handle_xerror);
/* Trying to create a 1x1 ximage */
GST_DEBUG ("XShmCreateImage of 1x1");
ximage = XShmCreateImage (xcontext->disp, xcontext->visual,
xcontext->depth, ZPixmap, NULL, &SHMInfo, 1, 1);
/* Might cause an error, sync to ensure it is noticed */
XSync (xcontext->disp, FALSE);
if (!ximage || error_caught) {
GST_WARNING ("could not XShmCreateImage a 1x1 image");
goto beach;
}
size = ximage->height * ximage->bytes_per_line;
SHMInfo.shmid = shmget (IPC_PRIVATE, size, IPC_CREAT | 0777);
if (SHMInfo.shmid == -1) {
GST_WARNING ("could not get shared memory of %" G_GSIZE_FORMAT " bytes",
size);
goto beach;
}
SHMInfo.shmaddr = shmat (SHMInfo.shmid, NULL, 0);
if (SHMInfo.shmaddr == ((void *) -1)) {
GST_WARNING ("Failed to shmat: %s", g_strerror (errno));
/* Clean up the shared memory segment */
shmctl (SHMInfo.shmid, IPC_RMID, NULL);
goto beach;
}
ximage->data = SHMInfo.shmaddr;
SHMInfo.readOnly = FALSE;
if (XShmAttach (xcontext->disp, &SHMInfo) == 0) {
GST_WARNING ("Failed to XShmAttach");
/* Clean up the shared memory segment */
shmctl (SHMInfo.shmid, IPC_RMID, NULL);
goto beach;
}
/* Sync to ensure we see any errors we caused */
XSync (xcontext->disp, FALSE);
/* Delete the shared memory segment as soon as everyone is attached.
* This way, it will be deleted as soon as we detach later, and not
* leaked if we crash. */
shmctl (SHMInfo.shmid, IPC_RMID, NULL);
if (!error_caught) {
GST_DEBUG ("XServer ShmAttached to 0x%x, id 0x%lx", SHMInfo.shmid,
SHMInfo.shmseg);
did_attach = TRUE;
/* store whether we succeeded in result */
result = TRUE;
} else {
GST_WARNING ("MIT-SHM extension check failed at XShmAttach. "
"Not using shared memory.");
}
beach:
/* Sync to ensure we swallow any errors we caused and reset error_caught */
XSync (xcontext->disp, FALSE);
error_caught = FALSE;
XSetErrorHandler (handler);
if (did_attach) {
GST_DEBUG ("XServer ShmDetaching from 0x%x id 0x%lx",
SHMInfo.shmid, SHMInfo.shmseg);
XShmDetach (xcontext->disp, &SHMInfo);
XSync (xcontext->disp, FALSE);
}
if (SHMInfo.shmaddr != ((void *) -1))
shmdt (SHMInfo.shmaddr);
if (ximage)
XDestroyImage (ximage);
return result;
}
#endif /* HAVE_XSHM */
/* bufferpool */
static void gst_ximage_buffer_pool_finalize (GObject * object);
#define gst_ximage_buffer_pool_parent_class parent_class
G_DEFINE_TYPE (GstXImageBufferPool, gst_ximage_buffer_pool,
GST_TYPE_BUFFER_POOL);
static const gchar **
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ximage_buffer_pool_get_options (GstBufferPool * pool)
{
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static const gchar *options[] = { GST_BUFFER_POOL_OPTION_VIDEO_META,
GST_BUFFER_POOL_OPTION_VIDEO_ALIGNMENT, NULL
};
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return options;
}
static gboolean
ximage_buffer_pool_set_config (GstBufferPool * pool, GstStructure * config)
{
GstXImageBufferPool *xpool = GST_XIMAGE_BUFFER_POOL_CAST (pool);
GstVideoInfo info;
GstCaps *caps;
guint size, min_buffers, max_buffers;
if (!gst_buffer_pool_config_get_params (config, &caps, &size, &min_buffers,
&max_buffers))
goto wrong_config;
if (caps == NULL)
goto no_caps;
/* now parse the caps from the config */
if (!gst_video_info_from_caps (&info, caps))
goto wrong_caps;
GST_LOG_OBJECT (pool, "%dx%d, caps %" GST_PTR_FORMAT, info.width, info.height,
caps);
/* keep track of the width and height and caps */
if (xpool->caps)
gst_caps_unref (xpool->caps);
xpool->caps = gst_caps_ref (caps);
/* check for the configured metadata */
xpool->add_metavideo =
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gst_buffer_pool_config_has_option (config,
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GST_BUFFER_POOL_OPTION_VIDEO_META);
/* parse extra alignment info */
xpool->need_alignment = gst_buffer_pool_config_has_option (config,
GST_BUFFER_POOL_OPTION_VIDEO_ALIGNMENT);
if (xpool->need_alignment) {
gst_buffer_pool_config_get_video_alignment (config, &xpool->align);
GST_LOG_OBJECT (pool, "padding %u-%ux%u-%u", xpool->align.padding_top,
xpool->align.padding_left, xpool->align.padding_left,
xpool->align.padding_bottom);
/* do padding and alignment */
gst_video_info_align (&info, &xpool->align);
gst_buffer_pool_config_set_video_alignment (config, &xpool->align);
/* we need the video metadata too now */
xpool->add_metavideo = TRUE;
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} else {
gst_video_alignment_reset (&xpool->align);
}
/* add the padding */
xpool->padded_width =
GST_VIDEO_INFO_WIDTH (&info) + xpool->align.padding_left +
xpool->align.padding_right;
xpool->padded_height =
GST_VIDEO_INFO_HEIGHT (&info) + xpool->align.padding_top +
xpool->align.padding_bottom;
xpool->info = info;
gst_buffer_pool_config_set_params (config, caps, info.size, min_buffers,
max_buffers);
return GST_BUFFER_POOL_CLASS (parent_class)->set_config (pool, config);
/* ERRORS */
wrong_config:
{
GST_WARNING_OBJECT (pool, "invalid config");
return FALSE;
}
no_caps:
{
GST_WARNING_OBJECT (pool, "no caps in config");
return FALSE;
}
wrong_caps:
{
GST_WARNING_OBJECT (pool,
"failed getting geometry from caps %" GST_PTR_FORMAT, caps);
return FALSE;
}
}
/* This function handles GstXImageBuffer creation depending on XShm availability */
static GstFlowReturn
ximage_buffer_pool_alloc (GstBufferPool * pool, GstBuffer ** buffer,
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GstBufferPoolAcquireParams * params)
{
GstXImageBufferPool *xpool = GST_XIMAGE_BUFFER_POOL_CAST (pool);
GstVideoInfo *info;
GstBuffer *ximage;
GstMemory *mem;
info = &xpool->info;
ximage = gst_buffer_new ();
mem = ximage_memory_alloc (xpool);
if (mem == NULL) {
gst_buffer_unref (ximage);
goto no_buffer;
}
gst_buffer_append_memory (ximage, mem);
if (xpool->add_metavideo) {
GstVideoMeta *meta;
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GST_DEBUG_OBJECT (pool, "adding GstVideoMeta");
/* these are just the defaults for now */
meta = gst_buffer_add_video_meta_full (ximage, GST_VIDEO_FRAME_FLAG_NONE,
GST_VIDEO_INFO_FORMAT (info), GST_VIDEO_INFO_WIDTH (info),
GST_VIDEO_INFO_HEIGHT (info), GST_VIDEO_INFO_N_PLANES (info),
info->offset, info->stride);
gst_video_meta_set_alignment (meta, xpool->align);
}
*buffer = ximage;
return GST_FLOW_OK;
/* ERROR */
no_buffer:
{
GST_WARNING_OBJECT (pool, "can't create image");
return GST_FLOW_ERROR;
}
}
GstBufferPool *
gst_ximage_buffer_pool_new (GstXImageSink * ximagesink)
{
GstXImageBufferPool *pool;
g_return_val_if_fail (GST_IS_X_IMAGE_SINK (ximagesink), NULL);
pool = g_object_new (GST_TYPE_XIMAGE_BUFFER_POOL, NULL);
gst_object_ref_sink (pool);
pool->sink = gst_object_ref (ximagesink);
pool->allocator = g_object_new (GST_TYPE_XIMAGE_MEMORY_ALLOCATOR, NULL);
gst_object_ref_sink (pool->allocator);
GST_LOG_OBJECT (pool, "new XImage buffer pool %p", pool);
return GST_BUFFER_POOL_CAST (pool);
}
static void
gst_ximage_buffer_pool_class_init (GstXImageBufferPoolClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstBufferPoolClass *gstbufferpool_class = (GstBufferPoolClass *) klass;
gobject_class->finalize = gst_ximage_buffer_pool_finalize;
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gstbufferpool_class->get_options = ximage_buffer_pool_get_options;
gstbufferpool_class->set_config = ximage_buffer_pool_set_config;
gstbufferpool_class->alloc_buffer = ximage_buffer_pool_alloc;
}
static void
gst_ximage_buffer_pool_init (GstXImageBufferPool * pool)
{
/* nothing to do here */
}
static void
gst_ximage_buffer_pool_finalize (GObject * object)
{
GstXImageBufferPool *pool = GST_XIMAGE_BUFFER_POOL_CAST (object);
GST_LOG_OBJECT (pool, "finalize XImage buffer pool %p", pool);
if (pool->caps)
gst_caps_unref (pool->caps);
gst_object_unref (pool->sink);
gst_object_unref (pool->allocator);
G_OBJECT_CLASS (gst_ximage_buffer_pool_parent_class)->finalize (object);
}