mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-10-05 02:02:26 +00:00
Implement GstV4l2Transform
Implement a v4l2 element that wraps HW video converters.
This commit is contained in:
parent
0028de808b
commit
b781156625
5 changed files with 767 additions and 0 deletions
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@ -11,6 +11,7 @@ libgstvideo4linux2_la_SOURCES = gstv4l2.c \
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gstv4l2src.c \
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gstv4l2radio.c \
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gstv4l2tuner.c \
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gstv4l2transform.c \
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gstv4l2videodec.c \
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gstv4l2vidorient.c \
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v4l2_calls.c \
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@ -50,6 +51,7 @@ noinst_HEADERS = \
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gstv4l2src.h \
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gstv4l2radio.h \
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gstv4l2tuner.h \
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gstv4l2transform.h \
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gstv4l2videodec.h \
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gstv4l2vidorient.h \
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v4l2_calls.h \
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@ -44,6 +44,7 @@
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#include "gstv4l2radio.h"
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#include "gstv4l2videodec.h"
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#include "gstv4l2devicemonitor.h"
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#include "gstv4l2transform.h"
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/* used in v4l2_calls.c and v4l2src_calls.c */
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GST_DEBUG_CATEGORY (v4l2_debug);
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@ -148,6 +149,9 @@ gst_v4l2_probe_and_register (GstPlugin * plugin)
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if (gst_v4l2_is_video_dec (sink_caps, src_caps))
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ret = gst_v4l2_video_dec_register (plugin, basename, it->device_path,
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sink_caps, src_caps);
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else if (gst_v4l2_is_transform (sink_caps, src_caps))
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ret = gst_v4l2_transform_register (plugin, basename, it->device_path,
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sink_caps, src_caps);
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/* else if ( ... etc. */
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gst_caps_unref (sink_caps);
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@ -1539,6 +1539,10 @@ gst_v4l2_object_add_aspect_ratio (GstV4l2Object * v4l2object, GstStructure * s)
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num = cropcap.pixelaspect.numerator;
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den = cropcap.pixelaspect.denominator;
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/* Ignore PAR that are 0/0 */
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if (den == 0)
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return;
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done:
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gst_structure_set (s, "pixel-aspect-ratio", GST_TYPE_FRACTION, num, den,
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NULL);
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677
sys/v4l2/gstv4l2transform.c
Normal file
677
sys/v4l2/gstv4l2transform.c
Normal file
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@ -0,0 +1,677 @@
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/*
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* Copyright (C) 2014 Collabora Ltd.
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* Author: Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <unistd.h>
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#include <string.h>
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#include "gstv4l2transform.h"
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#include "v4l2_calls.h"
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#include <string.h>
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#include <gst/gst-i18n-plugin.h>
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#define DEFAULT_PROP_DEVICE "/dev/video10"
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#define V4L2_TRANSFORM_QUARK \
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g_quark_from_static_string("gst-v4l2-transform-info")
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GST_DEBUG_CATEGORY_STATIC (gst_v4l2_transform_debug);
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#define GST_CAT_DEFAULT gst_v4l2_transform_debug
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enum
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{
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PROP_0,
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V4L2_STD_OBJECT_PROPS,
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PROP_CAPTURE_IO_MODE,
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};
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typedef struct
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{
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gchar *device;
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GstCaps *sink_caps;
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GstCaps *src_caps;
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} GstV4l2TransformCData;
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#define gst_v4l2_transform_parent_class parent_class
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G_DEFINE_ABSTRACT_TYPE (GstV4l2Transform, gst_v4l2_transform,
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GST_TYPE_BASE_TRANSFORM);
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static void
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gst_v4l2_transform_set_property (GObject * object,
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guint prop_id, const GValue * value, GParamSpec * pspec)
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{
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GstV4l2Transform *self = GST_V4L2_TRANSFORM (object);
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switch (prop_id) {
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/* Split IO mode so output is configure through 'io-mode' and capture
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* through 'capture-io-mode' */
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case PROP_IO_MODE:
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gst_v4l2_object_set_property_helper (self->v4l2output, prop_id, value,
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pspec);
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break;
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case PROP_CAPTURE_IO_MODE:
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gst_v4l2_object_set_property_helper (self->v4l2capture, prop_id, value,
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pspec);
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break;
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case PROP_DEVICE:
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gst_v4l2_object_set_property_helper (self->v4l2output, prop_id, value,
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pspec);
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gst_v4l2_object_set_property_helper (self->v4l2capture, prop_id, value,
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pspec);
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break;
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/* By default, only set on output */
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default:
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if (!gst_v4l2_object_set_property_helper (self->v4l2output,
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prop_id, value, pspec)) {
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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}
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break;
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}
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}
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static void
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gst_v4l2_transform_get_property (GObject * object,
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guint prop_id, GValue * value, GParamSpec * pspec)
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{
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GstV4l2Transform *self = GST_V4L2_TRANSFORM (object);
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switch (prop_id) {
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case PROP_IO_MODE:
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gst_v4l2_object_get_property_helper (self->v4l2output, prop_id, value,
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pspec);
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break;
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case PROP_CAPTURE_IO_MODE:
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gst_v4l2_object_get_property_helper (self->v4l2output, PROP_IO_MODE,
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value, pspec);
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break;
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/* By default read from output */
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default:
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if (!gst_v4l2_object_get_property_helper (self->v4l2output,
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prop_id, value, pspec)) {
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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}
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break;
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}
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}
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static gboolean
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gst_v4l2_transform_start (GstBaseTransform * trans)
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{
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GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans);
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GST_DEBUG_OBJECT (self, "Opening");
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if (!gst_v4l2_object_open (self->v4l2output))
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goto failure;
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if (!gst_v4l2_object_open_shared (self->v4l2capture, self->v4l2output))
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goto failure;
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self->probed_sinkcaps = gst_v4l2_object_get_caps (self->v4l2output,
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gst_v4l2_object_get_raw_caps ());
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if (gst_caps_is_empty (self->probed_sinkcaps))
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goto no_input_format;
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self->probed_srccaps = gst_v4l2_object_get_caps (self->v4l2capture,
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gst_v4l2_object_get_raw_caps ());
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if (gst_caps_is_empty (self->probed_srccaps))
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goto no_output_format;
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return TRUE;
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no_input_format:
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GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
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(_("Converter on device %s has no supported input format"),
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self->v4l2output->videodev), (NULL));
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goto failure;
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no_output_format:
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GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
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(_("Converter on device %s has no supported output format"),
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self->v4l2output->videodev), (NULL));
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goto failure;
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failure:
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if (GST_V4L2_IS_OPEN (self->v4l2output))
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gst_v4l2_object_close (self->v4l2output);
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if (GST_V4L2_IS_OPEN (self->v4l2capture))
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gst_v4l2_object_close (self->v4l2capture);
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gst_caps_replace (&self->probed_srccaps, NULL);
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gst_caps_replace (&self->probed_sinkcaps, NULL);
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return FALSE;
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}
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static gboolean
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gst_v4l2_transform_stop (GstBaseTransform * trans)
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{
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GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans);
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GST_DEBUG_OBJECT (self, "Closing");
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gst_v4l2_object_close (self->v4l2output);
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gst_v4l2_object_close (self->v4l2capture);
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gst_caps_replace (&self->probed_srccaps, NULL);
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gst_caps_replace (&self->probed_sinkcaps, NULL);
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return TRUE;
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}
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static gboolean
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gst_v4l2_transform_set_caps (GstBaseTransform * trans, GstCaps * incaps,
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GstCaps * outcaps)
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{
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GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans);
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/* TODO Add renegotiation support */
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g_return_val_if_fail (!GST_V4L2_IS_ACTIVE (self->v4l2output), FALSE);
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g_return_val_if_fail (!GST_V4L2_IS_ACTIVE (self->v4l2capture), FALSE);
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if (!gst_v4l2_object_set_format (self->v4l2output, incaps))
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goto incaps_failed;
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if (!gst_v4l2_object_set_format (self->v4l2capture, outcaps))
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goto outcaps_failed;
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return TRUE;
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incaps_failed:
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{
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GST_ERROR_OBJECT (self, "failed to set input caps: %" GST_PTR_FORMAT,
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incaps);
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return FALSE;
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}
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outcaps_failed:
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{
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gst_v4l2_object_stop (self->v4l2output);
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GST_ERROR_OBJECT (self, "failed to set output caps: %" GST_PTR_FORMAT,
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outcaps);
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return FALSE;
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}
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}
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static gboolean
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gst_v4l2_transform_query (GstBaseTransform * trans, GstPadDirection direction,
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GstQuery * query)
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{
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GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans);
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gboolean ret = TRUE;
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switch (GST_QUERY_TYPE (query)) {
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case GST_QUERY_CAPS:{
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GstCaps *filter, *caps = NULL, *result = NULL;
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GstPad *pad, *otherpad;
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gst_query_parse_caps (query, &filter);
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if (direction == GST_PAD_SRC) {
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pad = GST_BASE_TRANSFORM_SRC_PAD (trans);
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otherpad = GST_BASE_TRANSFORM_SINK_PAD (trans);
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if (self->probed_srccaps)
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caps = gst_caps_ref (self->probed_srccaps);
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} else {
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pad = GST_BASE_TRANSFORM_SINK_PAD (trans);
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otherpad = GST_BASE_TRANSFORM_SRC_PAD (trans);
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if (self->probed_srccaps)
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caps = gst_caps_ref (self->probed_srccaps);
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}
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if (!caps)
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caps = gst_pad_get_pad_template_caps (pad);
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if (filter) {
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GstCaps *tmp = caps;
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caps = gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
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gst_caps_unref (tmp);
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}
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result = gst_pad_peer_query_caps (otherpad, caps);
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result = gst_caps_make_writable (result);
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gst_caps_append (result, caps);
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GST_DEBUG_OBJECT (self, "Returning %s caps %" GST_PTR_FORMAT,
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GST_PAD_NAME (pad), result);
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gst_query_set_caps_result (query, result);
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gst_caps_unref (result);
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break;
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}
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default:
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ret = GST_BASE_TRANSFORM_CLASS (parent_class)->query (trans, direction,
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query);
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break;
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}
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return ret;
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}
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static gboolean
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gst_v4l2_transform_decide_allocation (GstBaseTransform * trans,
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GstQuery * query)
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{
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GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans);
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gboolean ret = FALSE;
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if (gst_v4l2_object_decide_allocation (self->v4l2capture, query))
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ret = GST_BASE_TRANSFORM_CLASS (parent_class)->decide_allocation (trans,
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query);
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return ret;
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}
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/* TODO */
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#if 0
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static gboolean
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gst_v4l2_transform_propose_allocation (GstBaseTransform * trans,
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GstQuery * decide_query, GstQuery * query)
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{
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GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans);
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gboolean ret = FALSE;
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/* FIXME propose alloc this need to be moved from src to v4l2object */
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if (gst_v4l2_object_propose_allocation (self->v4l2output, query))
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ret = GST_BASE_TRANSFORM_CLASS (parent_class)->propose_allocation (trans,
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query);
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return ret;
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}
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#endif
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/* copies the given caps */
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static GstCaps *
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gst_v4l2_transform_caps_remove_format_info (GstCaps * caps)
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{
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GstStructure *st;
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GstCapsFeatures *f;
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gint i, n;
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GstCaps *res;
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res = gst_caps_new_empty ();
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n = gst_caps_get_size (caps);
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for (i = 0; i < n; i++) {
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st = gst_caps_get_structure (caps, i);
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f = gst_caps_get_features (caps, i);
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/* If this is already expressed by the existing caps
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* skip this structure */
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if (i > 0 && gst_caps_is_subset_structure_full (res, st, f))
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continue;
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st = gst_structure_copy (st);
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/* Only remove format info for the cases when we can actually convert */
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if (!gst_caps_features_is_any (f)
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&& gst_caps_features_is_equal (f,
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GST_CAPS_FEATURES_MEMORY_SYSTEM_MEMORY))
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gst_structure_remove_fields (st, "format", "colorimetry", "chroma-site",
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NULL);
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gst_caps_append_structure_full (res, st, gst_caps_features_copy (f));
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}
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return res;
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}
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/* The caps can be transformed into any other caps with format info removed.
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* However, we should prefer passthrough, so if passthrough is possible,
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* put it first in the list. */
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static GstCaps *
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gst_v4l2_transform_transform_caps (GstBaseTransform * btrans,
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GstPadDirection direction, GstCaps * caps, GstCaps * filter)
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{
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GstCaps *tmp, *tmp2;
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GstCaps *result;
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/* Get all possible caps that we can transform to */
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tmp = gst_v4l2_transform_caps_remove_format_info (caps);
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if (filter) {
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tmp2 = gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
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gst_caps_unref (tmp);
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tmp = tmp2;
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}
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result = tmp;
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GST_DEBUG_OBJECT (btrans, "transformed %" GST_PTR_FORMAT " into %"
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GST_PTR_FORMAT, caps, result);
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return result;
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}
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static GstCaps *
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gst_v4l2_transform_fixate_caps (GstBaseTransform * trans,
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GstPadDirection direction, GstCaps * caps, GstCaps * othercaps)
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{
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GstCaps *result;
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GST_DEBUG_OBJECT (trans, "trying to fixate othercaps %" GST_PTR_FORMAT
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" based on caps %" GST_PTR_FORMAT, othercaps, caps);
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result = gst_caps_intersect (othercaps, caps);
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if (gst_caps_is_empty (result)) {
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gst_caps_unref (result);
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result = othercaps;
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} else {
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gst_caps_unref (othercaps);
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}
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GST_DEBUG_OBJECT (trans, "now fixating %" GST_PTR_FORMAT, result);
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result = gst_caps_fixate (result);
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return result;
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}
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|
||||
static GstFlowReturn
|
||||
gst_v4l2_transform_prepare_output_buffer (GstBaseTransform * trans,
|
||||
GstBuffer * inbuf, GstBuffer ** outbuf)
|
||||
{
|
||||
GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans);
|
||||
GstBufferPool *pool = GST_BUFFER_POOL (self->v4l2output->pool);
|
||||
GstFlowReturn ret = GST_FLOW_OK;
|
||||
|
||||
if (gst_base_transform_is_passthrough (trans)) {
|
||||
GST_DEBUG_OBJECT (self, "Passthrough, no need to do anything");
|
||||
*outbuf = inbuf;
|
||||
goto beach;
|
||||
}
|
||||
|
||||
GST_DEBUG_OBJECT (self, "Queue input buffer");
|
||||
ret = gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (pool), inbuf);
|
||||
if (ret != GST_FLOW_OK)
|
||||
goto beach;
|
||||
|
||||
pool = gst_base_transform_get_buffer_pool (trans);
|
||||
|
||||
if (!gst_buffer_pool_is_active (pool)) {
|
||||
if (!gst_buffer_pool_set_active (pool, TRUE))
|
||||
goto activate_failed;
|
||||
}
|
||||
|
||||
GST_DEBUG_OBJECT (self, "Dequeue output buffer");
|
||||
ret = gst_buffer_pool_acquire_buffer (pool, outbuf, NULL);
|
||||
g_object_unref (pool);
|
||||
|
||||
if (ret != GST_FLOW_OK)
|
||||
goto alloc_failed;
|
||||
|
||||
pool = self->v4l2capture->pool;
|
||||
ret = gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (pool), *outbuf);
|
||||
|
||||
if (ret != GST_FLOW_OK) {
|
||||
gst_buffer_unref (*outbuf);
|
||||
*outbuf = NULL;
|
||||
}
|
||||
|
||||
beach:
|
||||
return ret;
|
||||
|
||||
activate_failed:
|
||||
GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
|
||||
("failed to activate bufferpool"), ("failed to activate bufferpool"));
|
||||
return GST_FLOW_ERROR;
|
||||
|
||||
alloc_failed:
|
||||
GST_DEBUG_OBJECT (self, "could not allocate buffer from pool");
|
||||
return ret;
|
||||
}
|
||||
|
||||
static GstFlowReturn
|
||||
gst_v4l2_transform_transform (GstBaseTransform * trans, GstBuffer * inbuf,
|
||||
GstBuffer * outbuf)
|
||||
{
|
||||
/* Nothing to do */
|
||||
return GST_FLOW_OK;
|
||||
}
|
||||
|
||||
static gboolean
|
||||
gst_v4l2_transform_sink_event (GstBaseTransform * trans, GstEvent * event)
|
||||
{
|
||||
GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans);
|
||||
|
||||
switch (GST_EVENT_TYPE (event)) {
|
||||
case GST_EVENT_FLUSH_START:
|
||||
gst_v4l2_object_unlock (self->v4l2output);
|
||||
gst_v4l2_object_unlock (self->v4l2capture);
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
return GST_BASE_TRANSFORM_CLASS (parent_class)->sink_event (trans, event);
|
||||
}
|
||||
|
||||
static GstStateChangeReturn
|
||||
gst_v4l2_transform_change_state (GstElement * element,
|
||||
GstStateChange transition)
|
||||
{
|
||||
GstV4l2Transform *self = GST_V4L2_TRANSFORM (element);
|
||||
|
||||
if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) {
|
||||
gst_v4l2_object_unlock (self->v4l2output);
|
||||
gst_v4l2_object_unlock (self->v4l2capture);
|
||||
}
|
||||
|
||||
return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
|
||||
}
|
||||
|
||||
static void
|
||||
gst_v4l2_transform_dispose (GObject * object)
|
||||
{
|
||||
GstV4l2Transform *self = GST_V4L2_TRANSFORM (object);
|
||||
|
||||
gst_caps_replace (&self->probed_sinkcaps, NULL);
|
||||
gst_caps_replace (&self->probed_srccaps, NULL);
|
||||
|
||||
G_OBJECT_CLASS (parent_class)->dispose (object);
|
||||
}
|
||||
|
||||
static void
|
||||
gst_v4l2_transform_finalize (GObject * object)
|
||||
{
|
||||
GstV4l2Transform *self = GST_V4L2_TRANSFORM (object);
|
||||
|
||||
gst_v4l2_object_destroy (self->v4l2capture);
|
||||
gst_v4l2_object_destroy (self->v4l2output);
|
||||
|
||||
G_OBJECT_CLASS (parent_class)->finalize (object);
|
||||
}
|
||||
|
||||
static void
|
||||
gst_v4l2_transform_init (GstV4l2Transform * self)
|
||||
{
|
||||
/* V4L2 object are created in subinstance_init */
|
||||
}
|
||||
|
||||
static void
|
||||
gst_v4l2_transform_class_init (GstV4l2TransformClass * klass)
|
||||
{
|
||||
GstElementClass *element_class;
|
||||
GObjectClass *gobject_class;
|
||||
GstBaseTransformClass *base_transform_class;
|
||||
|
||||
element_class = (GstElementClass *) klass;
|
||||
gobject_class = (GObjectClass *) klass;
|
||||
base_transform_class = (GstBaseTransformClass *) klass;
|
||||
|
||||
gst_element_class_set_static_metadata (element_class,
|
||||
"V4L2 Video Converter",
|
||||
"Filter/Converter/Video",
|
||||
"Transform streams via V4L2 API",
|
||||
"Nicolas Dufresne <nicolas.dufresne@collabora.com>");
|
||||
|
||||
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_v4l2_transform_dispose);
|
||||
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_v4l2_transform_finalize);
|
||||
gobject_class->set_property =
|
||||
GST_DEBUG_FUNCPTR (gst_v4l2_transform_set_property);
|
||||
gobject_class->get_property =
|
||||
GST_DEBUG_FUNCPTR (gst_v4l2_transform_get_property);
|
||||
|
||||
base_transform_class->start = GST_DEBUG_FUNCPTR (gst_v4l2_transform_start);
|
||||
base_transform_class->stop = GST_DEBUG_FUNCPTR (gst_v4l2_transform_stop);
|
||||
base_transform_class->set_caps =
|
||||
GST_DEBUG_FUNCPTR (gst_v4l2_transform_set_caps);
|
||||
base_transform_class->query = GST_DEBUG_FUNCPTR (gst_v4l2_transform_query);
|
||||
base_transform_class->sink_event =
|
||||
GST_DEBUG_FUNCPTR (gst_v4l2_transform_sink_event);
|
||||
base_transform_class->decide_allocation =
|
||||
GST_DEBUG_FUNCPTR (gst_v4l2_transform_decide_allocation);
|
||||
/* TODO */
|
||||
#if 0
|
||||
base_transform_class->propose_allocation =
|
||||
GST_DEBUG_FUNCPTR (gst_v4l2_transform_propose_allocation);
|
||||
#endif
|
||||
base_transform_class->transform_caps =
|
||||
GST_DEBUG_FUNCPTR (gst_v4l2_transform_transform_caps);
|
||||
base_transform_class->fixate_caps =
|
||||
GST_DEBUG_FUNCPTR (gst_v4l2_transform_fixate_caps);
|
||||
base_transform_class->prepare_output_buffer =
|
||||
GST_DEBUG_FUNCPTR (gst_v4l2_transform_prepare_output_buffer);
|
||||
base_transform_class->transform =
|
||||
GST_DEBUG_FUNCPTR (gst_v4l2_transform_transform);
|
||||
|
||||
base_transform_class->passthrough_on_same_caps = TRUE;
|
||||
|
||||
/* FIXME need this ? */
|
||||
element_class->change_state =
|
||||
GST_DEBUG_FUNCPTR (gst_v4l2_transform_change_state);
|
||||
|
||||
gst_v4l2_object_install_properties_helper (gobject_class,
|
||||
DEFAULT_PROP_DEVICE);
|
||||
|
||||
/**
|
||||
* GstV4l2Transform:capture-io-mode
|
||||
*
|
||||
* Capture IO Mode
|
||||
*/
|
||||
g_object_class_install_property (gobject_class, PROP_IO_MODE,
|
||||
g_param_spec_enum ("capture-io-mode", "Capture IO mode",
|
||||
"Capture I/O mode",
|
||||
GST_TYPE_V4L2_IO_MODE, GST_V4L2_IO_AUTO,
|
||||
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
|
||||
}
|
||||
|
||||
static void
|
||||
gst_v4l2_transform_subclass_init (gpointer g_class, gpointer data)
|
||||
{
|
||||
GstV4l2TransformClass *klass = GST_V4L2_TRANSFORM_CLASS (g_class);
|
||||
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
|
||||
GstV4l2TransformCData *cdata = data;
|
||||
|
||||
klass->default_device = cdata->device;
|
||||
|
||||
/* Note: gst_pad_template_new() take the floating ref from the caps */
|
||||
gst_element_class_add_pad_template (element_class,
|
||||
gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
|
||||
cdata->sink_caps));
|
||||
gst_element_class_add_pad_template (element_class,
|
||||
gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
|
||||
cdata->src_caps));
|
||||
|
||||
g_free (cdata);
|
||||
}
|
||||
|
||||
static void
|
||||
gst_v4l2_transform_subinstance_init (GTypeInstance * instance, gpointer g_class)
|
||||
{
|
||||
GstV4l2TransformClass *klass = GST_V4L2_TRANSFORM_CLASS (g_class);
|
||||
GstV4l2Transform *self = GST_V4L2_TRANSFORM (instance);
|
||||
|
||||
self->v4l2output = gst_v4l2_object_new (GST_ELEMENT (self),
|
||||
V4L2_BUF_TYPE_VIDEO_OUTPUT, klass->default_device,
|
||||
gst_v4l2_get_output, gst_v4l2_set_output, NULL);
|
||||
self->v4l2output->no_initial_format = TRUE;
|
||||
self->v4l2output->keep_aspect = FALSE;
|
||||
|
||||
self->v4l2capture = gst_v4l2_object_new (GST_ELEMENT (self),
|
||||
V4L2_BUF_TYPE_VIDEO_CAPTURE, klass->default_device,
|
||||
gst_v4l2_get_input, gst_v4l2_set_input, NULL);
|
||||
self->v4l2capture->no_initial_format = TRUE;
|
||||
self->v4l2output->keep_aspect = FALSE;
|
||||
|
||||
g_object_set (self, "device", klass->default_device, NULL);
|
||||
}
|
||||
|
||||
/* Probing functions */
|
||||
gboolean
|
||||
gst_v4l2_is_transform (GstCaps * sink_caps, GstCaps * src_caps)
|
||||
{
|
||||
gboolean ret = FALSE;
|
||||
|
||||
if (gst_caps_is_subset (sink_caps, gst_v4l2_object_get_raw_caps ())
|
||||
&& gst_caps_is_subset (src_caps, gst_v4l2_object_get_raw_caps ()))
|
||||
ret = TRUE;
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
gboolean
|
||||
gst_v4l2_transform_register (GstPlugin * plugin, const gchar * basename,
|
||||
const gchar * device_path, GstCaps * sink_caps, GstCaps * src_caps)
|
||||
{
|
||||
GTypeQuery type_query;
|
||||
GTypeInfo type_info = { 0, };
|
||||
GType type, subtype;
|
||||
gchar *type_name;
|
||||
GstV4l2TransformCData *cdata;
|
||||
|
||||
cdata = g_new0 (GstV4l2TransformCData, 1);
|
||||
cdata->device = g_strdup (device_path);
|
||||
cdata->sink_caps = gst_caps_ref (sink_caps);
|
||||
cdata->src_caps = gst_caps_ref (src_caps);
|
||||
|
||||
type = gst_v4l2_transform_get_type ();
|
||||
g_type_query (type, &type_query);
|
||||
memset (&type_info, 0, sizeof (type_info));
|
||||
type_info.class_size = type_query.class_size;
|
||||
type_info.instance_size = type_query.instance_size;
|
||||
type_info.class_init = gst_v4l2_transform_subclass_init;
|
||||
type_info.class_data = cdata;
|
||||
type_info.instance_init = gst_v4l2_transform_subinstance_init;
|
||||
|
||||
type_name = g_strdup_printf ("v4l2%sconvert", basename);
|
||||
subtype = g_type_register_static (type, type_name, &type_info, 0);
|
||||
|
||||
gst_element_register (plugin, type_name, GST_RANK_PRIMARY + 1, subtype);
|
||||
|
||||
g_free (type_name);
|
||||
|
||||
return TRUE;
|
||||
}
|
80
sys/v4l2/gstv4l2transform.h
Normal file
80
sys/v4l2/gstv4l2transform.h
Normal file
|
@ -0,0 +1,80 @@
|
|||
/*
|
||||
* Copyright (C) 2014 Collabora Ltd.
|
||||
* Author: Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>
|
||||
*
|
||||
* 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.
|
||||
*
|
||||
*/
|
||||
|
||||
#ifndef __GST_V4L2_TRANSFORM_H__
|
||||
#define __GST_V4L2_TRANSFORM_H__
|
||||
|
||||
#include <gst/gst.h>
|
||||
#include <gst/base/gstbasetransform.h>
|
||||
|
||||
#include <gstv4l2object.h>
|
||||
#include <gstv4l2bufferpool.h>
|
||||
|
||||
GST_DEBUG_CATEGORY_EXTERN (v4l2transform_debug);
|
||||
|
||||
G_BEGIN_DECLS
|
||||
|
||||
#define GST_TYPE_V4L2_TRANSFORM \
|
||||
(gst_v4l2_transform_get_type())
|
||||
#define GST_V4L2_TRANSFORM(obj) \
|
||||
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_V4L2_TRANSFORM,GstV4l2Transform))
|
||||
#define GST_V4L2_TRANSFORM_CLASS(klass) \
|
||||
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_V4L2_TRANSFORM,GstV4l2TransformClass))
|
||||
#define GST_IS_V4L2_TRANSFORM(obj) \
|
||||
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_V4L2_TRANSFORM))
|
||||
#define GST_IS_V4L2_TRANSFORM_CLASS(obj) \
|
||||
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_V4L2_TRANSFORM))
|
||||
#define GST_V4L2_TRANSFORM_GET_CLASS(inst) \
|
||||
(G_TYPE_INSTANCE_GET_CLASS ((inst),GST_TYPE_V4L2_TRANSFORM,GstV4l2TransformClass))
|
||||
|
||||
typedef struct _GstV4l2Transform GstV4l2Transform;
|
||||
typedef struct _GstV4l2TransformClass GstV4l2TransformClass;
|
||||
|
||||
struct _GstV4l2Transform
|
||||
{
|
||||
GstBaseTransform parent;
|
||||
|
||||
/* < private > */
|
||||
GstV4l2Object * v4l2output;
|
||||
GstV4l2Object * v4l2capture;
|
||||
|
||||
/* pads */
|
||||
GstCaps *probed_srccaps;
|
||||
GstCaps *probed_sinkcaps;
|
||||
};
|
||||
|
||||
struct _GstV4l2TransformClass
|
||||
{
|
||||
GstBaseTransformClass parent_class;
|
||||
gchar *default_device;
|
||||
};
|
||||
|
||||
GType gst_v4l2_transform_get_type (void);
|
||||
|
||||
gboolean gst_v4l2_is_transform (GstCaps * sink_caps, GstCaps * src_caps);
|
||||
gboolean gst_v4l2_transform_register (GstPlugin * plugin,
|
||||
const gchar *basename,
|
||||
const gchar *device_path,
|
||||
GstCaps * sink_caps, GstCaps * src_caps);
|
||||
|
||||
G_END_DECLS
|
||||
|
||||
#endif /* __GST_V4L2_TRANSFORM_H__ */
|
Loading…
Reference in a new issue