gstreamer/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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
/* Object header */
#include "ximagesink.h"
/* Debugging category */
#include <gst/gstinfo.h>
GST_DEBUG_CATEGORY_EXTERN (gst_debug_ximagepool);
#define GST_CAT_DEFAULT gst_debug_ximagepool
static void gst_meta_ximage_free (GstMetaXImage * meta, GstBuffer * buffer);
/* ximage buffers */
const GstMetaInfo *
gst_meta_ximage_get_info (void)
{
static const GstMetaInfo *meta_ximage_info = NULL;
if (meta_ximage_info == NULL) {
meta_ximage_info = gst_meta_register ("GstMetaXImage", "GstMetaXImage",
sizeof (GstMetaXImage),
(GstMetaInitFunction) NULL,
(GstMetaFreeFunction) gst_meta_ximage_free,
(GstMetaCopyFunction) NULL,
(GstMetaSubFunction) NULL,
(GstMetaSerializeFunction) NULL, (GstMetaDeserializeFunction) NULL);
}
return meta_ximage_info;
}
/* X11 stuff */
static gboolean error_caught;
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;
}
GstBuffer *
gst_ximage_buffer_new (GstXImageSink * ximagesink, gint width, gint height)
{
GstBuffer *ximage;
int (*handler) (Display *, XErrorEvent *);
gboolean success = FALSE;
GstXContext *xcontext;
GstMetaXImage *meta;
xcontext = ximagesink->xcontext;
ximage = gst_buffer_new ();
meta = GST_META_XIMAGE_ADD (ximage);
#ifdef HAVE_XSHM
meta->SHMInfo.shmaddr = ((void *) -1);
meta->SHMInfo.shmid = -1;
#endif
meta->width = width;
meta->height = height;
meta->sink = gst_object_ref (ximagesink);
GST_DEBUG_OBJECT (ximagesink, "creating image %p (%dx%d)", ximage,
meta->width, meta->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) {
meta->ximage = XShmCreateImage (xcontext->disp,
xcontext->visual,
xcontext->depth,
ZPixmap, NULL, &meta->SHMInfo, meta->width, meta->height);
if (!meta->ximage || error_caught)
goto create_failed;
/* we have to use the returned bytes_per_line for our shm size */
meta->size = meta->ximage->bytes_per_line * meta->ximage->height;
GST_LOG_OBJECT (ximagesink,
"XShm image size is %" G_GSIZE_FORMAT ", width %d, stride %d",
meta->size, meta->width, meta->ximage->bytes_per_line);
/* get shared memory */
meta->SHMInfo.shmid = shmget (IPC_PRIVATE, meta->size, IPC_CREAT | 0777);
if (meta->SHMInfo.shmid == -1)
goto shmget_failed;
/* attach */
meta->SHMInfo.shmaddr = shmat (meta->SHMInfo.shmid, NULL, 0);
if (meta->SHMInfo.shmaddr == ((void *) -1))
goto shmat_failed;
/* now we can set up the image data */
meta->ximage->data = meta->SHMInfo.shmaddr;
meta->SHMInfo.readOnly = FALSE;
if (XShmAttach (xcontext->disp, &meta->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 (meta->SHMInfo.shmid, IPC_RMID, NULL);
} else
#endif /* HAVE_XSHM */
{
guint allocsize;
meta->ximage = XCreateImage (xcontext->disp,
xcontext->visual,
xcontext->depth,
ZPixmap, 0, NULL, meta->width, meta->height, xcontext->bpp, 0);
if (!meta->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 ((meta->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 */
meta->size = meta->ximage->bytes_per_line * meta->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 (meta->ximage->bytes_per_line) * meta->ximage->height;
meta->ximage->data = g_malloc (allocsize);
GST_LOG_OBJECT (ximagesink,
"non-XShm image size is %" G_GSIZE_FORMAT " (alloced: %u), width %d, "
"stride %d", meta->size, allocsize, meta->width,
meta->ximage->bytes_per_line);
XSync (xcontext->disp, FALSE);
}
/* Reset error handler */
error_caught = FALSE;
XSetErrorHandler (handler);
GST_BUFFER_DATA (ximage) = (guchar *) meta->ximage->data;
GST_BUFFER_SIZE (ximage) = meta->size;
g_mutex_unlock (ximagesink->x_lock);
success = TRUE;
beach:
if (!success) {
gst_buffer_unref (GST_BUFFER_CAST (ximage));
ximage = NULL;
}
return ximage;
/* 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",
meta->width, meta->height),
("could not XShmCreateImage a %dx%d image", meta->width, meta->height));
goto beach;
}
shmget_failed:
{
g_mutex_unlock (ximagesink->x_lock);
GST_ELEMENT_ERROR (ximagesink, RESOURCE, WRITE,
("Failed to create output image buffer of %dx%d pixels",
meta->width, meta->height),
("could not get shared memory of %" G_GSIZE_FORMAT " bytes",
meta->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",
meta->width, meta->height),
("Failed to shmat: %s", g_strerror (errno)));
/* Clean up the shared memory segment */
shmctl (meta->SHMInfo.shmid, IPC_RMID, NULL);
goto beach;
}
xattach_failed:
{
/* Clean up shm seg */
shmctl (meta->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",
meta->width, meta->height), ("Failed to XShmAttach"));
goto beach;
}
}
static void
gst_meta_ximage_free (GstMetaXImage * meta, GstBuffer * buffer)
{
GstXImageSink *ximagesink;
ximagesink = meta->sink;
GST_DEBUG_OBJECT (ximagesink, "free meta on buffer %p", buffer);
/* 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) {
GST_DEBUG_OBJECT (ximagesink, "Destroying XImage after XContext");
#ifdef HAVE_XSHM
if (meta->SHMInfo.shmaddr != ((void *) -1)) {
shmdt (meta->SHMInfo.shmaddr);
}
#endif
goto beach;
}
g_mutex_lock (ximagesink->x_lock);
#ifdef HAVE_XSHM
if (ximagesink->xcontext->use_xshm) {
if (meta->SHMInfo.shmaddr != ((void *) -1)) {
XShmDetach (ximagesink->xcontext->disp, &meta->SHMInfo);
XSync (ximagesink->xcontext->disp, 0);
shmdt (meta->SHMInfo.shmaddr);
meta->SHMInfo.shmaddr = (void *) -1;
}
if (meta->ximage)
XDestroyImage (meta->ximage);
} else
#endif /* HAVE_XSHM */
{
if (meta->ximage) {
XDestroyImage (meta->ximage);
}
}
XSync (ximagesink->xcontext->disp, FALSE);
g_mutex_unlock (ximagesink->x_lock);
beach:
GST_OBJECT_UNLOCK (ximagesink);
}
#ifdef HAVE_XSHM /* Check that XShm calls actually work */
gboolean
gst_ximagesink_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 shm seg */
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 shm seg */
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) {
did_attach = TRUE;
/* store whether we succeeded in result */
result = TRUE;
}
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) {
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_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_XIMAGE_BUFFER_POOL, GstXImageBufferPoolPrivate))
struct _GstXImageBufferPoolPrivate
{
GstCaps *caps;
gint width, height;
};
G_DEFINE_TYPE (GstXImageBufferPool, gst_ximage_buffer_pool,
GST_TYPE_BUFFER_POOL);
static gboolean
ximage_buffer_pool_set_config (GstBufferPool * pool, GstStructure * config)
{
GstXImageBufferPool *xpool = GST_XIMAGE_BUFFER_POOL_CAST (pool);
GstXImageBufferPoolPrivate *priv = xpool->priv;
GstStructure *structure;
gint width, height;
const GstCaps *caps;
if (!gst_buffer_pool_config_get (config, &caps, NULL, NULL, NULL, NULL,
NULL, NULL))
goto wrong_config;
if (caps == NULL)
goto no_caps;
/* now parse the caps from the config */
structure = gst_caps_get_structure (caps, 0);
if (!gst_structure_get_int (structure, "width", &width) ||
!gst_structure_get_int (structure, "height", &height))
goto wrong_caps;
GST_LOG_OBJECT (pool, "%dx%d, caps %" GST_PTR_FORMAT, width, height, caps);
/* keep track of the width and height and caps */
if (priv->caps)
gst_caps_unref (priv->caps);
priv->caps = gst_caps_copy (caps);
priv->width = width;
priv->height = height;
return TRUE;
/* 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,
GstBufferPoolParams * params)
{
GstXImageBufferPool *xpool = GST_XIMAGE_BUFFER_POOL_CAST (pool);
GstXImageBufferPoolPrivate *priv = xpool->priv;
GstBuffer *ximage;
ximage = gst_ximage_buffer_new (xpool->sink, priv->width, priv->height);
if (ximage == NULL)
goto no_buffer;
*buffer = ximage;
return GST_FLOW_OK;
/* ERROR */
no_buffer:
{
GST_WARNING_OBJECT (pool, "can't create image");
return GST_FLOW_ERROR;
}
}
static void
ximage_buffer_pool_free (GstBufferPool * pool, GstBuffer * buffer)
{
gst_buffer_unref (buffer);
}
GstBufferPool *
gst_ximage_buffer_pool_new (GstXImageSink * ximagesink)
{
GstXImageBufferPool *pool;
g_return_val_if_fail (GST_IS_XIMAGESINK (ximagesink), NULL);
pool = g_object_new (GST_TYPE_XIMAGE_BUFFER_POOL, NULL);
pool->sink = gst_object_ref (ximagesink);
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;
g_type_class_add_private (klass, sizeof (GstXImageBufferPoolPrivate));
gobject_class->finalize = gst_ximage_buffer_pool_finalize;
gstbufferpool_class->set_config = ximage_buffer_pool_set_config;
gstbufferpool_class->alloc_buffer = ximage_buffer_pool_alloc;
gstbufferpool_class->free_buffer = ximage_buffer_pool_free;
}
static void
gst_ximage_buffer_pool_init (GstXImageBufferPool * pool)
{
pool->priv = GST_XIMAGE_BUFFER_POOL_GET_PRIVATE (pool);
}
static void
gst_ximage_buffer_pool_finalize (GObject * object)
{
GstXImageBufferPool *pool = GST_XIMAGE_BUFFER_POOL_CAST (object);
GstXImageBufferPoolPrivate *priv = pool->priv;
GST_LOG_OBJECT (pool, "finalize XImage buffer pool %p", pool);
if (priv->caps)
gst_caps_unref (priv->caps);
gst_object_unref (pool->sink);
G_OBJECT_CLASS (gst_ximage_buffer_pool_parent_class)->finalize (object);
}