gstreamer/gst-libs/gst/video/gstvideometa.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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
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#include "gstvideometa.h"
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static gboolean
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gst_video_meta_transform (GstBuffer * dest, GstMeta * meta,
GstBuffer * buffer, GQuark type, gpointer data)
{
GstVideoMeta *dmeta, *smeta;
guint i;
smeta = (GstVideoMeta *) meta;
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if (GST_META_TRANSFORM_IS_COPY (type)) {
GstMetaTransformCopy *copy = data;
if (!copy->region) {
/* only copy if the complete data is copied as well */
dmeta =
(GstVideoMeta *) gst_buffer_add_meta (dest, GST_VIDEO_META_INFO,
NULL);
dmeta->buffer = dest;
GST_DEBUG ("copy video metadata");
dmeta->flags = smeta->flags;
dmeta->format = smeta->format;
dmeta->id = smeta->id;
dmeta->width = smeta->width;
dmeta->height = smeta->height;
dmeta->n_planes = smeta->n_planes;
for (i = 0; i < dmeta->n_planes; i++) {
dmeta->offset[i] = smeta->offset[i];
dmeta->stride[i] = smeta->stride[i];
}
dmeta->map = smeta->map;
dmeta->unmap = smeta->unmap;
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}
}
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return TRUE;
}
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GType
gst_video_meta_api_get_type (void)
{
static volatile GType type = 0;
static const gchar *tags[] = { "memory", "colorspace", "size", NULL };
if (g_once_init_enter (&type)) {
GType _type = gst_meta_api_type_register ("GstVideoMetaAPI", tags);
g_once_init_leave (&type, _type);
}
return type;
}
/* video metadata */
const GstMetaInfo *
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gst_video_meta_get_info (void)
{
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static const GstMetaInfo *video_meta_info = NULL;
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if (video_meta_info == NULL) {
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video_meta_info =
gst_meta_register (GST_VIDEO_META_API_TYPE, "GstVideoMeta",
sizeof (GstVideoMeta), (GstMetaInitFunction) NULL,
(GstMetaFreeFunction) NULL, gst_video_meta_transform);
}
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return video_meta_info;
}
/**
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* gst_buffer_get_video_meta_id:
* @buffer: a #GstBuffer
* @id: a metadata id
*
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* Find the #GstVideoMeta on @buffer with the given @id.
*
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* Buffers can contain multiple #GstVideoMeta metadata items when dealing with
* multiview buffers.
*
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* Returns: the #GstVideoMeta with @id or %NULL when there is no such metadata
* on @buffer.
*/
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GstVideoMeta *
gst_buffer_get_video_meta_id (GstBuffer * buffer, gint id)
{
gpointer state = NULL;
GstMeta *meta;
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const GstMetaInfo *info = GST_VIDEO_META_INFO;
while ((meta = gst_buffer_iterate_meta (buffer, &state))) {
if (meta->info->api == info->api) {
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GstVideoMeta *vmeta = (GstVideoMeta *) meta;
if (vmeta->id == id)
return vmeta;
}
}
return NULL;
}
static gboolean
default_map (GstVideoMeta * meta, guint plane, GstMapInfo * info,
gpointer * data, gint * stride, GstMapFlags flags)
{
guint offset, idx, length;
gsize skip;
GstBuffer *buffer = meta->buffer;
offset = meta->offset[plane];
/* find the memory block for this plane, this is the memory block containing
* the plane offset. FIXME use plane size */
if (!gst_buffer_find_memory (buffer, offset, 1, &idx, &length, &skip))
goto no_memory;
if (!gst_buffer_map_range (buffer, idx, length, info, flags))
goto cannot_map;
*stride = meta->stride[plane];
*data = (guint8 *) info->data + skip;
return TRUE;
/* ERRORS */
no_memory:
{
GST_DEBUG ("no memory");
return FALSE;
}
cannot_map:
{
GST_DEBUG ("cannot map memory");
return FALSE;
}
}
static gboolean
default_unmap (GstVideoMeta * meta, guint plane, GstMapInfo * info)
{
GstBuffer *buffer = meta->buffer;
gst_buffer_unmap (buffer, info);
return TRUE;
}
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/**
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* gst_buffer_add_video_meta:
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* @buffer: a #GstBuffer
* @flags: #GstVideoFlags
* @format: a #GstVideoFormat
* @width: the width
* @height: the height
*
* Attaches GstVideoMeta metadata to @buffer with the given parameters and the
* default offsets and strides for @format and @width x @height.
*
* This function calculates the default offsets and strides and then calls
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* gst_buffer_add_video_meta_full() with them.
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*
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* Returns: the #GstVideoMeta on @buffer.
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*/
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GstVideoMeta *
gst_buffer_add_video_meta (GstBuffer * buffer, GstVideoFlags flags,
GstVideoFormat format, guint width, guint height)
{
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GstVideoMeta *meta;
GstVideoInfo info;
gst_video_info_set_format (&info, format, width, height);
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meta = gst_buffer_add_video_meta_full (buffer, flags, format, width, height,
info.finfo->n_planes, info.offset, info.stride);
return meta;
}
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/**
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* gst_buffer_add_video_meta_full:
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* @buffer: a #GstBuffer
* @flags: #GstVideoFlags
* @format: a #GstVideoFormat
* @width: the width
* @height: the height
* @n_planes: number of planes
* @offset: offset of each plane
* @stride: stride of each plane
*
* Attaches GstVideoMeta metadata to @buffer with the given parameters.
*
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* Returns: the #GstVideoMeta on @buffer.
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*/
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GstVideoMeta *
gst_buffer_add_video_meta_full (GstBuffer * buffer, GstVideoFlags flags,
GstVideoFormat format, guint width, guint height,
guint n_planes, gsize offset[GST_VIDEO_MAX_PLANES],
gint stride[GST_VIDEO_MAX_PLANES])
{
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GstVideoMeta *meta;
guint i;
meta =
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(GstVideoMeta *) gst_buffer_add_meta (buffer, GST_VIDEO_META_INFO, NULL);
meta->flags = flags;
meta->format = format;
meta->id = 0;
meta->width = width;
meta->height = height;
meta->buffer = buffer;
meta->n_planes = n_planes;
for (i = 0; i < n_planes; i++) {
meta->offset[i] = offset[i];
meta->stride[i] = stride[i];
}
meta->map = default_map;
meta->unmap = default_unmap;
return meta;
}
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/**
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* gst_video_meta_map:
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* @meta: a #GstVideoMeta
* @plane: a plane
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* @info: a #GstMapInfo
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* @data: the data of @plane
* @stride: the stride of @plane
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* @flags: @GstMapFlags
*
* Map the video plane with index @plane in @meta and return a pointer to the
* first byte of the plane and the stride of the plane.
*
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* Returns: TRUE if the map operation was successful.
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*/
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gboolean
gst_video_meta_map (GstVideoMeta * meta, guint plane, GstMapInfo * info,
gpointer * data, gint * stride, GstMapFlags flags)
{
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g_return_val_if_fail (meta != NULL, FALSE);
g_return_val_if_fail (meta->map != NULL, FALSE);
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g_return_val_if_fail (plane < meta->n_planes, FALSE);
g_return_val_if_fail (info != NULL, FALSE);
g_return_val_if_fail (data != NULL, FALSE);
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g_return_val_if_fail (stride != NULL, FALSE);
g_return_val_if_fail (meta->buffer != NULL, FALSE);
g_return_val_if_fail (!(flags & GST_MAP_WRITE)
|| gst_buffer_is_writable (meta->buffer), FALSE);
return meta->map (meta, plane, info, data, stride, flags);
}
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/**
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* gst_video_meta_unmap:
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* @meta: a #GstVideoMeta
* @plane: a plane
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* @info: a #GstMapInfo
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*
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* Unmap a previously mapped plane with gst_video_meta_map().
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*
* Returns: TRUE if the memory was successfully unmapped.
*/
gboolean
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gst_video_meta_unmap (GstVideoMeta * meta, guint plane, GstMapInfo * info)
{
g_return_val_if_fail (meta != NULL, FALSE);
g_return_val_if_fail (meta->unmap != NULL, FALSE);
g_return_val_if_fail (plane < meta->n_planes, FALSE);
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g_return_val_if_fail (info != NULL, FALSE);
return meta->unmap (meta, plane, info);
}
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static gboolean
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gst_video_crop_meta_transform (GstBuffer * dest, GstMeta * meta,
GstBuffer * buffer, GQuark type, gpointer data)
{
GstVideoCropMeta *dmeta, *smeta;
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if (GST_META_TRANSFORM_IS_COPY (type)) {
smeta = (GstVideoCropMeta *) meta;
dmeta = gst_buffer_add_video_crop_meta (dest);
GST_DEBUG ("copy crop metadata");
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dmeta->x = smeta->x;
dmeta->y = smeta->y;
dmeta->width = smeta->width;
dmeta->height = smeta->height;
} else if (GST_VIDEO_META_TRANSFORM_IS_SCALE (type)) {
GstVideoMetaTransform *trans = data;
gint ow, oh, nw, nh;
smeta = (GstVideoCropMeta *) meta;
dmeta = gst_buffer_add_video_crop_meta (dest);
ow = GST_VIDEO_INFO_WIDTH (trans->in_info);
nw = GST_VIDEO_INFO_WIDTH (trans->out_info);
oh = GST_VIDEO_INFO_HEIGHT (trans->in_info);
nh = GST_VIDEO_INFO_HEIGHT (trans->out_info);
GST_DEBUG ("scaling crop metadata %dx%d -> %dx%d", ow, oh, nw, nh);
dmeta->x = (smeta->x * nw) / ow;
dmeta->y = (smeta->y * nh) / oh;
dmeta->width = (smeta->width * nw) / ow;
dmeta->height = (smeta->height * nh) / oh;
GST_DEBUG ("crop offset %dx%d -> %dx%d", smeta->x, smeta->y, dmeta->x,
dmeta->y);
GST_DEBUG ("crop size %dx%d -> %dx%d", smeta->width, smeta->height,
dmeta->width, dmeta->height);
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}
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return TRUE;
}
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GType
gst_video_crop_meta_api_get_type (void)
{
static volatile GType type = 0;
static const gchar *tags[] = { "size", "orientation", NULL };
if (g_once_init_enter (&type)) {
GType _type = gst_meta_api_type_register ("GstVideoCropMetaAPI", tags);
g_once_init_leave (&type, _type);
}
return type;
}
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const GstMetaInfo *
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gst_video_crop_meta_get_info (void)
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{
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static const GstMetaInfo *video_crop_meta_info = NULL;
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if (video_crop_meta_info == NULL) {
video_crop_meta_info =
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gst_meta_register (GST_VIDEO_CROP_META_API_TYPE, "GstVideoCropMeta",
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sizeof (GstVideoCropMeta), (GstMetaInitFunction) NULL,
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(GstMetaFreeFunction) NULL, gst_video_crop_meta_transform);
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}
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return video_crop_meta_info;
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}
/**
* gst_video_meta_transform_scale_get_quark:
*
* Get the #GQuark for the "gst-video-scale" metadata transform operation.
*
* Returns: a #GQuark
*/
GQuark
gst_video_meta_transform_scale_get_quark (void)
{
static GQuark _value = 0;
if (_value == 0) {
_value = g_quark_from_static_string ("gst-video-scale");
}
return _value;
}