gstreamer/sys/applemedia/corevideobuffer.c

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/*
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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"
#include "corevideomemory.h"
static const GstMetaInfo *gst_core_video_meta_get_info (void);
static void
gst_core_video_meta_add (GstBuffer * buffer, CVBufferRef cvbuf)
{
GstCoreVideoMeta *meta;
meta = (GstCoreVideoMeta *) gst_buffer_add_meta (buffer,
gst_core_video_meta_get_info (), NULL);
meta->cvbuf = CVBufferRetain (cvbuf);
meta->pixbuf = (CVPixelBufferRef) cvbuf;
}
static gboolean
gst_core_video_meta_init (GstCoreVideoMeta * meta, gpointer params,
GstBuffer * buf)
{
meta->cvbuf = NULL;
meta->pixbuf = NULL;
return TRUE;
}
static void
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gst_core_video_meta_free (GstCoreVideoMeta * meta, GstBuffer * buf)
{
CVBufferRelease (meta->cvbuf);
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}
static gboolean
gst_core_video_meta_transform (GstBuffer * transbuf, GstCoreVideoMeta * meta,
GstBuffer * buffer, GQuark type, GstMetaTransformCopy * data)
{
if (!data->region) {
/* only copy if the complete data is copied as well */
gst_core_video_meta_add (transbuf, meta->cvbuf);
} else {
GST_WARNING_OBJECT (transbuf,
"dropping Core Video metadata due to partial buffer");
}
return TRUE; /* retval unused */
}
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;
}
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static const GstMetaInfo *
gst_core_video_meta_get_info (void)
{
static const GstMetaInfo *core_video_meta_info = NULL;
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if (g_once_init_enter (&core_video_meta_info)) {
const GstMetaInfo *meta = gst_meta_register (GST_CORE_VIDEO_META_API_TYPE,
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"GstCoreVideoMeta", sizeof (GstCoreVideoMeta),
(GstMetaInitFunction) gst_core_video_meta_init,
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(GstMetaFreeFunction) gst_core_video_meta_free,
(GstMetaTransformFunction) gst_core_video_meta_transform);
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g_once_init_leave (&core_video_meta_info, meta);
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}
return core_video_meta_info;
}
void
gst_core_video_wrap_pixel_buffer (GstBuffer * buf, GstVideoInfo * info,
CVPixelBufferRef pixel_buf, gboolean * has_padding)
{
guint n_planes;
gsize offset[GST_VIDEO_MAX_PLANES] = { 0 };
gint stride[GST_VIDEO_MAX_PLANES] = { 0 };
UInt32 size;
GstAppleCoreVideoPixelBuffer *gpixbuf;
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gpixbuf = gst_apple_core_video_pixel_buffer_new (pixel_buf);
*has_padding = FALSE;
if (CVPixelBufferIsPlanar (pixel_buf)) {
gint i, size = 0, plane_offset = 0;
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n_planes = CVPixelBufferGetPlaneCount (pixel_buf);
for (i = 0; i < n_planes; i++) {
stride[i] = CVPixelBufferGetBytesPerRowOfPlane (pixel_buf, i);
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if (stride[i] != GST_VIDEO_INFO_PLANE_STRIDE (info, i)) {
*has_padding = TRUE;
}
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size = stride[i] * CVPixelBufferGetHeightOfPlane (pixel_buf, i);
offset[i] = plane_offset;
plane_offset += size;
gst_buffer_append_memory (buf,
gst_apple_core_video_memory_new_wrapped (gpixbuf, i, size));
}
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} else {
n_planes = 1;
stride[0] = CVPixelBufferGetBytesPerRow (pixel_buf);
offset[0] = 0;
size = stride[0] * CVPixelBufferGetHeight (pixel_buf);
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gst_buffer_append_memory (buf,
gst_apple_core_video_memory_new_wrapped (gpixbuf,
GST_APPLE_CORE_VIDEO_NO_PLANE, size));
}
gst_apple_core_video_pixel_buffer_unref (gpixbuf);
if (info) {
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GstVideoMeta *video_meta;
video_meta =
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gst_buffer_add_video_meta_full (buf, GST_VIDEO_FRAME_FLAG_NONE,
GST_VIDEO_INFO_FORMAT (info), info->width, info->height, n_planes,
offset, stride);
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}
}
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GstBuffer *
gst_core_video_buffer_new (CVBufferRef cvbuf, GstVideoInfo * vinfo)
{
CVPixelBufferRef pixbuf = NULL;
GstBuffer *buf;
GstCoreVideoMeta *meta;
gboolean has_padding; /* not used for now */
if (CFGetTypeID (cvbuf) != CVPixelBufferGetTypeID ())
/* TODO: Do we need to handle other buffer types? */
return NULL;
pixbuf = (CVPixelBufferRef) cvbuf;
buf = gst_buffer_new ();
/* add the corevideo meta to pass 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;
gst_core_video_wrap_pixel_buffer (buf, vinfo, pixbuf, &has_padding);
return buf;
}