gstreamer/gst-libs/gst/video/gstvideopool.c

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/* GStreamer
* Copyright (C) <2011> Wim Taymans <wim.taymans@gmail.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 "gst/video/gstvideometa.h"
#include "gst/video/gstvideopool.h"
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/**
* SECTION:gstvideopool
* @short_description: GstBufferPool for raw video buffers
* @see_also: #GstBufferPool
*
* Special GstBufferPool subclass for raw video buffers.
*
* Allows configuration of video-specific requirements such as
* stride alignments or pixel padding, and can also be configured
* to automatically add #GstVideoMeta to the buffers.
*/
/**
* gst_buffer_pool_config_set_video_alignment:
* @config: a #GstStructure
* @align: a #GstVideoAlignment
*
* Set the video alignment in @align to the bufferpool configuration
* @config
*/
void
gst_buffer_pool_config_set_video_alignment (GstStructure * config,
GstVideoAlignment * align)
{
g_return_if_fail (config != NULL);
g_return_if_fail (align != NULL);
gst_structure_set (config,
"padding-top", G_TYPE_UINT, align->padding_top,
"padding-bottom", G_TYPE_UINT, align->padding_bottom,
"padding-left", G_TYPE_UINT, align->padding_left,
"padding-right", G_TYPE_UINT, align->padding_right,
"stride-align0", G_TYPE_UINT, align->stride_align[0],
"stride-align1", G_TYPE_UINT, align->stride_align[1],
"stride-align2", G_TYPE_UINT, align->stride_align[2],
"stride-align3", G_TYPE_UINT, align->stride_align[3], NULL);
}
/**
* gst_buffer_pool_config_get_video_alignment:
* @config: a #GstStructure
* @align: a #GstVideoAlignment
*
* Get the video alignment from the bufferpool configuration @config in
* in @align
*
* Returns: #TRUE if @config could be parsed correctly.
*/
gboolean
gst_buffer_pool_config_get_video_alignment (GstStructure * config,
GstVideoAlignment * align)
{
g_return_val_if_fail (config != NULL, FALSE);
g_return_val_if_fail (align != NULL, FALSE);
return gst_structure_get (config,
"padding-top", G_TYPE_UINT, &align->padding_top,
"padding-bottom", G_TYPE_UINT, &align->padding_bottom,
"padding-left", G_TYPE_UINT, &align->padding_left,
"padding-right", G_TYPE_UINT, &align->padding_right,
"stride-align0", G_TYPE_UINT, &align->stride_align[0],
"stride-align1", G_TYPE_UINT, &align->stride_align[1],
"stride-align2", G_TYPE_UINT, &align->stride_align[2],
"stride-align3", G_TYPE_UINT, &align->stride_align[3], NULL);
}
/* bufferpool */
struct _GstVideoBufferPoolPrivate
{
GstCaps *caps;
GstVideoInfo info;
GstVideoAlignment video_align;
gboolean add_videometa;
gboolean need_alignment;
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GstAllocator *allocator;
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GstAllocationParams params;
};
static void gst_video_buffer_pool_finalize (GObject * object);
#define GST_VIDEO_BUFFER_POOL_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_VIDEO_BUFFER_POOL, GstVideoBufferPoolPrivate))
#define gst_video_buffer_pool_parent_class parent_class
G_DEFINE_TYPE (GstVideoBufferPool, gst_video_buffer_pool, GST_TYPE_BUFFER_POOL);
static const gchar **
video_buffer_pool_get_options (GstBufferPool * pool)
{
static const gchar *options[] = { GST_BUFFER_POOL_OPTION_VIDEO_META,
GST_BUFFER_POOL_OPTION_VIDEO_ALIGNMENT, NULL
};
return options;
}
static gboolean
video_buffer_pool_set_config (GstBufferPool * pool, GstStructure * config)
{
GstVideoBufferPool *vpool = GST_VIDEO_BUFFER_POOL_CAST (pool);
GstVideoBufferPoolPrivate *priv = vpool->priv;
GstVideoInfo info;
GstCaps *caps;
guint size, min_buffers, max_buffers;
gint width, height;
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GstAllocator *allocator;
GstAllocationParams params;
if (!gst_buffer_pool_config_get_params (config, &caps, &size, &min_buffers,
&max_buffers))
goto wrong_config;
if (caps == NULL)
goto no_caps;
/* now parse the caps from the config */
if (!gst_video_info_from_caps (&info, caps))
goto wrong_caps;
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if (!gst_buffer_pool_config_get_allocator (config, &allocator, &params))
goto wrong_config;
width = info.width;
height = info.height;
GST_LOG_OBJECT (pool, "%dx%d, caps %" GST_PTR_FORMAT, width, height, caps);
if (priv->caps)
gst_caps_unref (priv->caps);
priv->caps = gst_caps_ref (caps);
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priv->params = params;
if (priv->allocator)
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gst_object_unref (priv->allocator);
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if ((priv->allocator = allocator))
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gst_object_ref (allocator);
/* enable metadata based on config of the pool */
priv->add_videometa =
gst_buffer_pool_config_has_option (config,
GST_BUFFER_POOL_OPTION_VIDEO_META);
/* parse extra alignment info */
priv->need_alignment = gst_buffer_pool_config_has_option (config,
GST_BUFFER_POOL_OPTION_VIDEO_ALIGNMENT);
if (priv->need_alignment && priv->add_videometa) {
/* get an apply the alignment to the info */
gst_buffer_pool_config_get_video_alignment (config, &priv->video_align);
gst_video_info_align (&info, &priv->video_align);
gst_buffer_pool_config_set_video_alignment (config, &priv->video_align);
}
priv->info = info;
gst_buffer_pool_config_set_params (config, caps, info.size, min_buffers,
max_buffers);
return GST_BUFFER_POOL_CLASS (parent_class)->set_config (pool, config);
/* ERRORS */
wrong_config:
{
GST_WARNING_OBJECT (pool, "invalid config");
return FALSE;
}
no_caps:
{
GST_WARNING_OBJECT (pool, "no caps in config");
return FALSE;
}
wrong_caps:
{
GST_WARNING_OBJECT (pool,
"failed getting geometry from caps %" GST_PTR_FORMAT, caps);
return FALSE;
}
}
static GstFlowReturn
video_buffer_pool_alloc (GstBufferPool * pool, GstBuffer ** buffer,
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GstBufferPoolAcquireParams * params)
{
GstVideoBufferPool *vpool = GST_VIDEO_BUFFER_POOL_CAST (pool);
GstVideoBufferPoolPrivate *priv = vpool->priv;
GstVideoInfo *info;
info = &priv->info;
GST_DEBUG_OBJECT (pool, "alloc %" G_GSIZE_FORMAT, info->size);
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*buffer =
gst_buffer_new_allocate (priv->allocator, info->size, &priv->params);
if (*buffer == NULL)
goto no_memory;
if (priv->add_videometa) {
GST_DEBUG_OBJECT (pool, "adding GstVideoMeta");
gst_buffer_add_video_meta_full (*buffer, GST_VIDEO_FRAME_FLAG_NONE,
GST_VIDEO_INFO_FORMAT (info),
GST_VIDEO_INFO_WIDTH (info), GST_VIDEO_INFO_HEIGHT (info),
GST_VIDEO_INFO_N_PLANES (info), info->offset, info->stride);
}
return GST_FLOW_OK;
/* ERROR */
no_memory:
{
GST_WARNING_OBJECT (pool, "can't create memory");
return GST_FLOW_ERROR;
}
}
/**
* gst_video_buffer_pool_new:
*
* Create a new bufferpool that can allocate video frames. This bufferpool
* supports all the video bufferpool options.
*
* Returns: (transfer floating): a new #GstBufferPool to allocate video frames
*/
GstBufferPool *
gst_video_buffer_pool_new ()
{
GstVideoBufferPool *pool;
pool = g_object_new (GST_TYPE_VIDEO_BUFFER_POOL, NULL);
GST_LOG_OBJECT (pool, "new video buffer pool %p", pool);
return GST_BUFFER_POOL_CAST (pool);
}
static void
gst_video_buffer_pool_class_init (GstVideoBufferPoolClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstBufferPoolClass *gstbufferpool_class = (GstBufferPoolClass *) klass;
g_type_class_add_private (klass, sizeof (GstVideoBufferPoolPrivate));
gobject_class->finalize = gst_video_buffer_pool_finalize;
gstbufferpool_class->get_options = video_buffer_pool_get_options;
gstbufferpool_class->set_config = video_buffer_pool_set_config;
gstbufferpool_class->alloc_buffer = video_buffer_pool_alloc;
}
static void
gst_video_buffer_pool_init (GstVideoBufferPool * pool)
{
pool->priv = GST_VIDEO_BUFFER_POOL_GET_PRIVATE (pool);
}
static void
gst_video_buffer_pool_finalize (GObject * object)
{
GstVideoBufferPool *pool = GST_VIDEO_BUFFER_POOL_CAST (object);
GstVideoBufferPoolPrivate *priv = pool->priv;
GST_LOG_OBJECT (pool, "finalize video buffer pool %p", pool);
if (priv->caps)
gst_caps_unref (priv->caps);
if (priv->allocator)
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gst_object_unref (priv->allocator);
G_OBJECT_CLASS (gst_video_buffer_pool_parent_class)->finalize (object);
}