gstreamer/ext/wayland/waylandpool.c

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/* GStreamer
* Copyright (C) 2012 Intel Corporation
* Copyright (C) 2012 Sreerenj Balachandran <sreerenj.balachandran@intel.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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
/* Object header */
#include "gstwaylandsink.h"
/* Debugging category */
#include <gst/gstinfo.h>
/* Helper functions */
#include <gst/video/video.h>
#include <gst/video/gstvideometa.h>
#include <gst/video/gstvideopool.h>
/* wl metadata */
GType
gst_wl_meta_api_get_type (void)
{
static volatile GType type;
static const gchar *tags[] =
{ "memory", "size", "colorspace", "orientation", NULL };
if (g_once_init_enter (&type)) {
GType _type = gst_meta_api_type_register ("GstWlMetaAPI", tags);
g_once_init_leave (&type, _type);
}
return type;
}
static void
gst_wl_meta_free (GstWlMeta * meta, GstBuffer * buffer)
{
gst_object_unref (meta->sink);
munmap (meta->data, meta->size);
wl_buffer_destroy (meta->wbuffer);
}
const GstMetaInfo *
gst_wl_meta_get_info (void)
{
static const GstMetaInfo *wl_meta_info = NULL;
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if (g_once_init_enter (&wl_meta_info)) {
const GstMetaInfo *meta =
gst_meta_register (GST_WL_META_API_TYPE, "GstWlMeta",
sizeof (GstWlMeta), (GstMetaInitFunction) NULL,
(GstMetaFreeFunction) gst_wl_meta_free,
(GstMetaTransformFunction) NULL);
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g_once_init_leave (&wl_meta_info, meta);
}
return wl_meta_info;
}
/* bufferpool */
static void gst_wayland_buffer_pool_finalize (GObject * object);
#define gst_wayland_buffer_pool_parent_class parent_class
G_DEFINE_TYPE (GstWaylandBufferPool, gst_wayland_buffer_pool,
GST_TYPE_BUFFER_POOL);
static gboolean
wayland_buffer_pool_set_config (GstBufferPool * pool, GstStructure * config)
{
GstWaylandBufferPool *wpool = GST_WAYLAND_BUFFER_POOL_CAST (pool);
GstVideoInfo info;
GstCaps *caps;
if (!gst_buffer_pool_config_get_params (config, &caps, NULL, NULL, NULL))
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);
/*Fixme: Enable metadata checking handling based on the config of pool */
wpool->caps = gst_caps_ref (caps);
wpool->info = info;
wpool->width = info.width;
wpool->height = info.height;
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;
}
}
static struct wl_shm_pool *
make_shm_pool (struct display *display, int size, void **data)
{
struct wl_shm_pool *pool;
int fd;
char filename[1024];
static int init = 0;
snprintf (filename, 256, "%s-%d-%s", "/tmp/wayland-shm", init++, "XXXXXX");
fd = mkstemp (filename);
if (fd < 0) {
GST_ERROR ("open %s failed:", filename);
return NULL;
}
if (ftruncate (fd, size) < 0) {
GST_ERROR ("ftruncate failed:..!");
close (fd);
return NULL;
}
*data = mmap (NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (*data == MAP_FAILED) {
GST_ERROR ("mmap failed: ");
close (fd);
return NULL;
}
pool = wl_shm_create_pool (display->shm, fd, size);
close (fd);
return pool;
}
static struct shm_pool *
shm_pool_create (struct display *display, size_t size)
{
struct shm_pool *pool = malloc (sizeof *pool);
if (!pool)
return NULL;
pool->pool = make_shm_pool (display, size, &pool->data);
if (!pool->pool) {
free (pool);
return NULL;
}
pool->size = size;
pool->used = 0;
return pool;
}
static void *
shm_pool_allocate (struct shm_pool *pool, size_t size, int *offset)
{
if (pool->used + size > pool->size)
return NULL;
*offset = pool->used;
pool->used += size;
return (char *) pool->data + *offset;
}
/* Start allocating from the beginning of the pool again */
static void
shm_pool_reset (struct shm_pool *pool)
{
pool->used = 0;
}
static GstWlMeta *
gst_buffer_add_wayland_meta (GstBuffer * buffer, GstWaylandBufferPool * wpool)
{
GstWlMeta *wmeta;
GstWaylandSink *sink;
void *data;
gint offset;
guint stride = 0;
guint size = 0;
sink = wpool->sink;
stride = wpool->width * 4;
size = stride * wpool->height;
wmeta = (GstWlMeta *) gst_buffer_add_meta (buffer, GST_WL_META_INFO, NULL);
wmeta->sink = gst_object_ref (sink);
/*Fixme: size calculation should be more grcefull, have to consider the padding */
if (!sink->shm_pool) {
sink->shm_pool = shm_pool_create (sink->display, size * 15);
shm_pool_reset (sink->shm_pool);
}
if (!sink->shm_pool) {
GST_ERROR ("Failed to create shm_pool");
return NULL;
}
data = shm_pool_allocate (sink->shm_pool, size, &offset);
if (!data)
return NULL;
wmeta->wbuffer = wl_shm_pool_create_buffer (sink->shm_pool->pool, offset,
sink->video_width, sink->video_height, stride, WL_SHM_FORMAT_XRGB8888);
wmeta->data = data;
wmeta->size = size;
gst_buffer_append_memory (buffer,
gst_memory_new_wrapped (GST_MEMORY_FLAG_NO_SHARE, data,
size, 0, size, NULL, NULL));
return wmeta;
}
static GstFlowReturn
wayland_buffer_pool_alloc (GstBufferPool * pool, GstBuffer ** buffer,
GstBufferPoolAcquireParams * params)
{
GstWaylandBufferPool *w_pool = GST_WAYLAND_BUFFER_POOL_CAST (pool);
GstBuffer *w_buffer;
GstWlMeta *meta;
w_buffer = gst_buffer_new ();
meta = gst_buffer_add_wayland_meta (w_buffer, w_pool);
if (meta == NULL) {
gst_buffer_unref (w_buffer);
goto no_buffer;
}
*buffer = w_buffer;
return GST_FLOW_OK;
/* ERROR */
no_buffer:
{
GST_WARNING_OBJECT (pool, "can't create buffer");
return GST_FLOW_ERROR;
}
}
GstBufferPool *
gst_wayland_buffer_pool_new (GstWaylandSink * waylandsink)
{
GstWaylandBufferPool *pool;
g_return_val_if_fail (GST_IS_WAYLAND_SINK (waylandsink), NULL);
pool = g_object_new (GST_TYPE_WAYLAND_BUFFER_POOL, NULL);
pool->sink = gst_object_ref (waylandsink);
return GST_BUFFER_POOL_CAST (pool);
}
static void
gst_wayland_buffer_pool_class_init (GstWaylandBufferPoolClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstBufferPoolClass *gstbufferpool_class = (GstBufferPoolClass *) klass;
gobject_class->finalize = gst_wayland_buffer_pool_finalize;
gstbufferpool_class->set_config = wayland_buffer_pool_set_config;
gstbufferpool_class->alloc_buffer = wayland_buffer_pool_alloc;
}
static void
gst_wayland_buffer_pool_init (GstWaylandBufferPool * pool)
{
}
static void
gst_wayland_buffer_pool_finalize (GObject * object)
{
GstWaylandBufferPool *pool = GST_WAYLAND_BUFFER_POOL_CAST (object);
gst_object_unref (pool->sink);
G_OBJECT_CLASS (gst_wayland_buffer_pool_parent_class)->finalize (object);
}