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/* GStreamer
* Copyright (C) 2009 Benjamin Otte <otte@gnome.org>
*
* 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
#include "gstcairopad.h"
#include "gstcairobuffer.h"
#include "gstcairoformat-private.h"
/**
* gst_cairo_pad_template_new:
* @name: name of the template
* @dir: direction of template
* @presence: presence of pads created from this template
*
* This is a convenience macro for creating pad templates for use in
* elements that use gst-plugins-cairo. It is recommended to use this
* function when creating pad templates in your elements and not use
* GstStaticPadTemplate<!-- -->s, because then the element will
* automatically benefit from new formats added to gst-plugins-cairo.
*
* Returns: a new pad template accepting all formats that
* gst-plugins-cairo supports.
**/
/**
* GstCairoRestrictCapsFunction:
* @caps: caps to restrict
* @data: data passed to gst_cairo_pad_alloc_buffer_full()
*
* Function used when fixating caps in gst_cairo_pad_alloc_buffer_full().
* The function is supposed to return a possibly reduced #GstCaps that
* should be used for caps negotiation. If the restricted caps would be
* empty, this function should return %NULL.
*
* Returns: %NULL or a subset of the given caps.
*/
/**
* gst_cairo_pad_alloc_buffer:
* @pad: a source pad
* @buffer: pointer to set the allocated buffer on
*
* Tries to allocate a new buffer on @pad for use with gstcairo. The @pad
* must accept a subset of caps returned by gst_cairo_caps_any(). If @pad
* is not yet negotiated, this function will attempt to do so and return
* #GST_FLOW_NOT_NEGOTIATED if that fails.
*
* Returns: #GST_FLOW_OK on success
**/
GstFlowReturn
gst_cairo_pad_alloc_buffer (GstPad * pad, GstBuffer ** buffer)
{
return gst_cairo_pad_alloc_buffer_full (pad, NULL, NULL, TRUE, buffer);
}
/**
* gst_cairo_pad_alloc_buffer_full:
* @pad: a source pad
* @restrict_func: function that restricts allowed caps or %NULL
* @restrict_data: data to pass to @restrict_func
* @set_caps: %TRUE to set caps on @pad if the pad doesn't have caps yet.
* @buffer: location to store newly allocated buffer
*
* This is the function you should use to allocate buffers in your element.
* Always use this function instead of gst_pad_alloc_buffer() as this
* function will use special features of cairo bufers that allow allocating
* accelerated buffers even when different caps are in use by the pad(s).
* See gst_cairo_buffer_is_fixed() for a discussion of this feature.
* The function will use the caps of @pad to allocate the new buffer.
*
* Returns: a result code indicating success of the operation. Any result
* code other than GST_FLOW_OK is an error and buf should not be
* used. An error can occur if the pad is not connected or when the
* downstream peer elements cannot provide an acceptable buffer.
* MT safe.
**/
GstFlowReturn
gst_cairo_pad_alloc_buffer_full (GstPad * pad,
GstCairoRestrictCapsFunction restrict_func, gpointer restrict_data,
gboolean set_caps, GstBuffer ** buffer)
{
GstCairoFormat *format;
GstCaps *caps;
GstFlowReturn ret;
g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
g_return_val_if_fail (GST_PAD_IS_SRC (pad), GST_FLOW_ERROR);
g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
caps = GST_PAD_CAPS (pad);
if (G_LIKELY (caps)) {
format = gst_cairo_format_new (caps);
ret = gst_pad_alloc_buffer_and_set_caps (pad, GST_BUFFER_OFFSET_NONE,
gst_cairo_format_get_buffer_size (format), caps, buffer);
gst_cairo_format_free (format);
return ret;
} else {
caps = gst_pad_get_allowed_caps (pad);
if (caps && restrict_func)
caps = restrict_func (caps, restrict_data);
if (caps == NULL)
return GST_FLOW_NOT_NEGOTIATED;
if (!gst_caps_is_fixed (caps)) {
caps = gst_caps_make_writable (caps);
gst_pad_fixate_caps (pad, caps);
gst_caps_truncate (caps);
if (set_caps)
gst_pad_set_caps (pad, caps);
}
format = gst_cairo_format_new (caps);
ret = gst_pad_alloc_buffer_and_set_caps (pad,
GST_BUFFER_OFFSET_NONE, gst_cairo_format_get_buffer_size (format),
caps, buffer);
gst_caps_unref (caps);
}
if (*buffer == NULL) {
*buffer = gst_cairo_buffer_new (format);
gst_buffer_set_caps (*buffer, caps);
}
gst_cairo_format_free (format);
return ret;
}
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