gstreamer/sys/applemedia/corevideobuffer.c
Ole André Vadla Ravnås b4654f537f applemedia: lock CVPixelBuffer read-only
As per Apple's docs, this may improve performance by avoiding redundant
invalidations of existing caches of the buffer contents.
2010-11-08 23:58:24 +01:00

94 lines
2.7 KiB
C

/*
* Copyright (C) 2010 Ole André Vadla Ravnås <oravnas@cisco.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.
*/
#include "corevideobuffer.h"
G_DEFINE_TYPE (GstCoreVideoBuffer, gst_core_video_buffer, GST_TYPE_BUFFER);
static void
gst_core_video_buffer_init (GstCoreVideoBuffer * self)
{
GST_BUFFER_FLAG_SET (self, GST_BUFFER_FLAG_READONLY);
}
static void
gst_core_video_buffer_finalize (GstMiniObject * mini_object)
{
GstCoreVideoBuffer *self = GST_CORE_VIDEO_BUFFER_CAST (mini_object);
GstCVApi *cv = self->ctx->cv;
if (self->pixbuf != NULL) {
cv->CVPixelBufferUnlockBaseAddress (self->pixbuf,
kCVPixelBufferLock_ReadOnly);
}
cv->CVBufferRelease (self->cvbuf);
g_object_unref (self->ctx);
GST_MINI_OBJECT_CLASS (gst_core_video_buffer_parent_class)->finalize
(mini_object);
}
GstBuffer *
gst_core_video_buffer_new (GstCoreMediaCtx * ctx, CVBufferRef cvbuf)
{
GstCVApi *cv = ctx->cv;
void *data;
size_t size;
CVPixelBufferRef pixbuf = NULL;
GstCoreVideoBuffer *buf;
if (CFGetTypeID (cvbuf) == cv->CVPixelBufferGetTypeID ()) {
pixbuf = (CVPixelBufferRef) cvbuf;
if (cv->CVPixelBufferLockBaseAddress (pixbuf,
kCVPixelBufferLock_ReadOnly) != kCVReturnSuccess) {
goto error;
}
data = cv->CVPixelBufferGetBaseAddress (pixbuf);
size = cv->CVPixelBufferGetBytesPerRow (pixbuf) *
cv->CVPixelBufferGetHeight (pixbuf);
} else {
/* TODO: Do we need to handle other buffer types? */
goto error;
}
buf = GST_CORE_VIDEO_BUFFER_CAST (gst_mini_object_new
(GST_TYPE_CORE_VIDEO_BUFFER));
buf->ctx = g_object_ref (ctx);
buf->cvbuf = cv->CVBufferRetain (cvbuf);
buf->pixbuf = pixbuf;
GST_BUFFER_DATA (buf) = data;
GST_BUFFER_SIZE (buf) = size;
return GST_BUFFER_CAST (buf);
error:
return NULL;
}
static void
gst_core_video_buffer_class_init (GstCoreVideoBufferClass * klass)
{
GstMiniObjectClass *miniobject_class = GST_MINI_OBJECT_CLASS (klass);
miniobject_class->finalize = gst_core_video_buffer_finalize;
}