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/*
* Copyright (C) 2010 Ole André Vadla Ravnås <oleavr@soundrop.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.
*/
#include "corevideobuffer.h"
static void
gst_core_video_meta_free (GstCoreVideoMeta * meta, GstBuffer * buf)
{
if (meta->pixbuf != NULL) {
CVPixelBufferUnlockBaseAddress (meta->pixbuf, 0);
}
CVBufferRelease (meta->cvbuf);
}
GType
gst_core_video_meta_api_get_type (void)
{
static volatile GType type;
static const gchar *tags[] = { "memory", NULL };
if (g_once_init_enter (&type)) {
GType _type = gst_meta_api_type_register ("GstCoreVideoMetaAPI", tags);
g_once_init_leave (&type, _type);
}
return type;
}
static const GstMetaInfo *
gst_core_video_meta_get_info (void)
{
static const GstMetaInfo *core_video_meta_info = NULL;
if (g_once_init_enter (&core_video_meta_info)) {
const GstMetaInfo *meta = gst_meta_register (GST_CORE_VIDEO_META_API_TYPE,
"GstCoreVideoMeta", sizeof (GstCoreVideoMeta),
(GstMetaInitFunction) NULL,
(GstMetaFreeFunction) gst_core_video_meta_free,
(GstMetaTransformFunction) NULL);
g_once_init_leave (&core_video_meta_info, meta);
}
return core_video_meta_info;
}
GstBuffer *
gst_core_video_buffer_new (CVBufferRef cvbuf, GstVideoInfo * vinfo,
gboolean map)
{
CVPixelBufferRef pixbuf = NULL;
GstBuffer *buf;
GstCoreVideoMeta *meta;
guint n_planes;
gsize offset[GST_VIDEO_MAX_PLANES];
gint stride[GST_VIDEO_MAX_PLANES];
if (CFGetTypeID (cvbuf) != CVPixelBufferGetTypeID ())
/* TODO: Do we need to handle other buffer types? */
goto error;
pixbuf = (CVPixelBufferRef) cvbuf;
if (map && CVPixelBufferLockBaseAddress (pixbuf, 0) != kCVReturnSuccess) {
goto error;
}
buf = gst_buffer_new ();
/* add the corevideo meta to free the underlying corevideo buffer */
meta = (GstCoreVideoMeta *) gst_buffer_add_meta (buf,
gst_core_video_meta_get_info (), NULL);
meta->cvbuf = CVBufferRetain (cvbuf);
meta->pixbuf = pixbuf;
/* set stride, offset and size */
memset (&offset, 0, sizeof (offset));
memset (&stride, 0, sizeof (stride));
if (CVPixelBufferIsPlanar (pixbuf)) {
int i, size, off;
n_planes = CVPixelBufferGetPlaneCount (pixbuf);
off = 0;
for (i = 0; i < n_planes; ++i) {
stride[i] = CVPixelBufferGetBytesPerRowOfPlane (pixbuf, i);
size = stride[i] * CVPixelBufferGetHeightOfPlane (pixbuf, i);
offset[i] = off;
off += size;
if (map) {
gst_buffer_append_memory (buf,
gst_memory_new_wrapped (GST_MEMORY_FLAG_NO_SHARE,
CVPixelBufferGetBaseAddressOfPlane (pixbuf, i), size, 0, size,
NULL, NULL));
}
}
} else {
int size;
n_planes = 1;
stride[0] = CVPixelBufferGetBytesPerRow (pixbuf);
offset[0] = 0;
size = stride[0] * CVPixelBufferGetHeight (pixbuf);
if (map) {
gst_buffer_append_memory (buf,
gst_memory_new_wrapped (GST_MEMORY_FLAG_NO_SHARE,
CVPixelBufferGetBaseAddress (pixbuf), size, 0, size, NULL, NULL));
}
}
if (vinfo) {
GstVideoMeta *video_meta;
video_meta =
gst_buffer_add_video_meta_full (buf, GST_VIDEO_FRAME_FLAG_NONE,
vinfo->finfo->format, CVPixelBufferGetWidth (pixbuf),
CVPixelBufferGetHeight (pixbuf), n_planes, offset, stride);
}
return buf;
error:
return NULL;
}
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