gstreamer/sys/applemedia/corevideobuffer.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;
}