gstreamer/ext/wayland/wlshmallocator.c

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/* GStreamer Wayland video sink
*
* Copyright (C) 2012 Intel Corporation
* Copyright (C) 2012 Sreerenj Balachandran <sreerenj.balachandran@intel.com>
* Copyright (C) 2014 Collabora Ltd.
*
* 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.
*/
#include "wlshmallocator.h"
#include "wlvideoformat.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/types.h>
GST_DEBUG_CATEGORY_EXTERN (gstwayland_debug);
#define GST_CAT_DEFAULT gstwayland_debug
G_DEFINE_TYPE (GstWlShmAllocator, gst_wl_shm_allocator, GST_TYPE_ALLOCATOR);
static GstMemory *
gst_wl_shm_allocator_alloc (GstAllocator * allocator, gsize size,
GstAllocationParams * params)
{
GstWlShmAllocator *self = GST_WL_SHM_ALLOCATOR (allocator);
char filename[1024];
static int init = 0;
int fd;
gpointer data;
GstWlShmMemory *mem;
/* TODO: make use of the allocation params, if necessary */
/* allocate shm pool */
snprintf (filename, 1024, "%s/%s-%d-%s", g_get_user_runtime_dir (),
"wayland-shm", init++, "XXXXXX");
fd = g_mkstemp (filename);
if (fd < 0) {
GST_ERROR_OBJECT (self, "opening temp file %s failed: %s", filename,
strerror (errno));
return NULL;
}
if (ftruncate (fd, size) < 0) {
GST_ERROR_OBJECT (self, "ftruncate failed: %s", strerror (errno));
close (fd);
return NULL;
}
data = mmap (NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (data == MAP_FAILED) {
GST_ERROR_OBJECT (self, "mmap failed: %s", strerror (errno));
close (fd);
return NULL;
}
unlink (filename);
mem = g_slice_new0 (GstWlShmMemory);
gst_memory_init ((GstMemory *) mem, GST_MEMORY_FLAG_NO_SHARE, allocator, NULL,
size, 0, 0, size);
mem->data = data;
mem->fd = fd;
return (GstMemory *) mem;
}
static void
gst_wl_shm_allocator_free (GstAllocator * allocator, GstMemory * memory)
{
GstWlShmMemory *shm_mem = (GstWlShmMemory *) memory;
if (shm_mem->fd != -1)
close (shm_mem->fd);
munmap (shm_mem->data, memory->maxsize);
g_slice_free (GstWlShmMemory, shm_mem);
}
static gpointer
gst_wl_shm_mem_map (GstMemory * mem, gsize maxsize, GstMapFlags flags)
{
return ((GstWlShmMemory *) mem)->data;
}
static void
gst_wl_shm_mem_unmap (GstMemory * mem)
{
}
static void
gst_wl_shm_allocator_class_init (GstWlShmAllocatorClass * klass)
{
GstAllocatorClass *alloc_class = (GstAllocatorClass *) klass;
alloc_class->alloc = GST_DEBUG_FUNCPTR (gst_wl_shm_allocator_alloc);
alloc_class->free = GST_DEBUG_FUNCPTR (gst_wl_shm_allocator_free);
}
static void
gst_wl_shm_allocator_init (GstWlShmAllocator * self)
{
self->parent_instance.mem_type = GST_ALLOCATOR_WL_SHM;
self->parent_instance.mem_map = gst_wl_shm_mem_map;
self->parent_instance.mem_unmap = gst_wl_shm_mem_unmap;
GST_OBJECT_FLAG_SET (self, GST_ALLOCATOR_FLAG_CUSTOM_ALLOC);
}
void
gst_wl_shm_allocator_register (void)
{
gst_allocator_register (GST_ALLOCATOR_WL_SHM,
g_object_new (GST_TYPE_WL_SHM_ALLOCATOR, NULL));
}
GstAllocator *
gst_wl_shm_allocator_get (void)
{
return gst_allocator_find (GST_ALLOCATOR_WL_SHM);
}
gboolean
gst_is_wl_shm_memory (GstMemory * mem)
{
return gst_memory_is_type (mem, GST_ALLOCATOR_WL_SHM);
}
struct wl_buffer *
gst_wl_shm_memory_construct_wl_buffer (GstMemory * mem, GstWlDisplay * display,
const GstVideoInfo * info)
{
GstWlShmMemory *shm_mem = (GstWlShmMemory *) mem;
gint width, height, stride;
gsize size;
enum wl_shm_format format;
struct wl_shm_pool *wl_pool;
struct wl_buffer *wbuffer;
width = GST_VIDEO_INFO_WIDTH (info);
height = GST_VIDEO_INFO_HEIGHT (info);
stride = GST_VIDEO_INFO_PLANE_STRIDE (info, 0);
size = GST_VIDEO_INFO_SIZE (info);
format = gst_video_format_to_wl_shm_format (GST_VIDEO_INFO_FORMAT (info));
g_return_val_if_fail (gst_is_wl_shm_memory (mem), NULL);
g_return_val_if_fail (size <= mem->size, NULL);
g_return_val_if_fail (shm_mem->fd != -1, NULL);
GST_DEBUG_OBJECT (mem->allocator, "Creating wl_buffer of size %"
G_GSSIZE_FORMAT " (%d x %d, stride %d), format %s", size, width, height,
stride, gst_wl_shm_format_to_string (format));
wl_pool = wl_shm_create_pool (display->shm, shm_mem->fd, mem->size);
wbuffer = wl_shm_pool_create_buffer (wl_pool, 0, width, height, stride,
format);
close (shm_mem->fd);
shm_mem->fd = -1;
wl_shm_pool_destroy (wl_pool);
return wbuffer;
}