diff options
| -rw-r--r-- | sys/v4l2codecs/gstv4l2decoder.c | 214 | ||||
| -rw-r--r-- | sys/v4l2codecs/gstv4l2decoder.h | 52 | ||||
| -rw-r--r-- | sys/v4l2codecs/meson.build | 1 |
3 files changed, 267 insertions, 0 deletions
diff --git a/sys/v4l2codecs/gstv4l2decoder.c b/sys/v4l2codecs/gstv4l2decoder.c new file mode 100644 index 000000000..451e49cae --- /dev/null +++ b/sys/v4l2codecs/gstv4l2decoder.c @@ -0,0 +1,214 @@ +/* GStreamer + * Copyright (C) 2020 Nicolas Dufresne <nicolas.dufresne@collabora.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. + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include "gstv4l2decoder.h" +#include "linux/media.h" +#include "linux/videodev2.h" + +#include <fcntl.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <unistd.h> + +GST_DEBUG_CATEGORY (v4l2_decoder_debug); +#define GST_CAT_DEFAULT v4l2_decoder_debug + +enum +{ + PROP_0, + PROP_MEDIA_DEVICE, + PROP_VIDEO_DEVICE, +}; + +struct _GstV4l2Decoder +{ + GstObject parent; + + gboolean opened; + gint media_fd; + gint video_fd; + + /* properties */ + gchar *media_device; + gchar *video_device; +}; + +G_DEFINE_TYPE_WITH_CODE (GstV4l2Decoder, gst_v4l2_decoder, GST_TYPE_OBJECT, + GST_DEBUG_CATEGORY_INIT (v4l2_decoder_debug, "v4l2codecs-decoder", 0, + "V4L2 stateless decoder helper")); + +static void +gst_v4l2_decoder_finalize (GObject * obj) +{ + GstV4l2Decoder *self = GST_V4L2_DECODER (obj); + + if (self->media_fd) + close (self->media_fd); + if (self->video_fd) + close (self->media_fd); + + g_free (self->media_device); + g_free (self->video_device); + + G_OBJECT_CLASS (gst_v4l2_decoder_parent_class)->finalize (obj); +} + +static void +gst_v4l2_decoder_init (GstV4l2Decoder * self) +{ +} + +static void +gst_v4l2_decoder_class_init (GstV4l2DecoderClass * klass) +{ + GObjectClass *gobject_class = G_OBJECT_CLASS (klass); + + gobject_class->finalize = gst_v4l2_decoder_finalize; + gobject_class->get_property = gst_v4l2_decoder_get_property; + gobject_class->set_property = gst_v4l2_decoder_set_property; + + gst_v4l2_decoder_install_properties (gobject_class, 0, NULL); +} + +GstV4l2Decoder * +gst_v4l2_decoder_new (GstV4l2CodecDevice * device) +{ + GstV4l2Decoder *decoder; + + g_return_val_if_fail (device->function == MEDIA_ENT_F_PROC_VIDEO_DECODER, + NULL); + + decoder = g_object_new (GST_TYPE_V4L2_DECODER, + "media-device", device->media_device_path, + "video-device", device->video_device_path, NULL); + + return gst_object_ref_sink (decoder); +} + +gboolean +gst_v4l2_decoder_open (GstV4l2Decoder * self) +{ + self->media_fd = open (self->media_device, 0); + if (self->media_fd < 0) { + GST_ERROR_OBJECT (self, "Failed to open '%s': %s", + self->media_device, g_strerror (errno)); + return FALSE; + } + + self->video_fd = open (self->video_device, 0); + if (self->video_fd < 0) { + GST_ERROR_OBJECT (self, "Failed to open '%s': %s", + self->video_device, g_strerror (errno)); + return FALSE; + } + + self->opened = TRUE; + + return TRUE; +} + +gboolean +gst_v4l2_decoder_enum_input_fmt (GstV4l2Decoder * self, gint i, + guint32 * out_fmt) +{ + struct v4l2_fmtdesc fmtdesc = { i, V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE, }; + gint ret; + + g_return_val_if_fail (self->opened, FALSE); + + ret = ioctl (self->video_fd, VIDIOC_ENUM_FMT, &fmtdesc); + if (ret < 0) { + if (errno != EINVAL) + GST_ERROR_OBJECT (self, "VIDIOC_ENUM_FMT failed: %s", g_strerror (errno)); + return FALSE; + } + + GST_DEBUG_OBJECT (self, "Found format %" GST_FOURCC_FORMAT " (%s)", + GST_FOURCC_ARGS (fmtdesc.pixelformat), fmtdesc.description); + *out_fmt = fmtdesc.pixelformat; + + return TRUE; +} + +void +gst_v4l2_decoder_install_properties (GObjectClass * gobject_class, + gint prop_offset, GstV4l2CodecDevice * device) +{ + const gchar *media_device_path = NULL; + const gchar *video_device_path = NULL; + + if (device) { + media_device_path = device->media_device_path; + video_device_path = device->video_device_path; + } + + g_object_class_install_property (gobject_class, PROP_MEDIA_DEVICE, + g_param_spec_string ("media-device", "Media Device Path", + "Path to the media device node", media_device_path, + G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); + + g_object_class_install_property (gobject_class, PROP_VIDEO_DEVICE, + g_param_spec_string ("video-device", "Video Device Path", + "Path to the video device node", video_device_path, + G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); +} + +void +gst_v4l2_decoder_set_property (GObject * object, guint prop_id, + const GValue * value, GParamSpec * pspec) +{ + GstV4l2Decoder *self = GST_V4L2_DECODER (object); + + switch (prop_id) { + case PROP_MEDIA_DEVICE: + g_free (self->media_device); + self->media_device = g_value_dup_string (value); + break; + case PROP_VIDEO_DEVICE: + g_free (self->video_device); + self->video_device = g_value_dup_string (value); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); + break; + } +} + +void +gst_v4l2_decoder_get_property (GObject * object, guint prop_id, + GValue * value, GParamSpec * pspec) +{ + GstV4l2Decoder *self = GST_V4L2_DECODER (object); + + switch (prop_id) { + case PROP_MEDIA_DEVICE: + g_value_set_string (value, self->media_device); + break; + case PROP_VIDEO_DEVICE: + g_value_set_string (value, self->video_device); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); + break; + } +} diff --git a/sys/v4l2codecs/gstv4l2decoder.h b/sys/v4l2codecs/gstv4l2decoder.h new file mode 100644 index 000000000..ef6efd1ee --- /dev/null +++ b/sys/v4l2codecs/gstv4l2decoder.h @@ -0,0 +1,52 @@ +/* GStreamer + * Copyright (C) 2020 Nicolas Dufresne <nicolas.dufresne@collabora.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. + */ + +#ifndef __GST_V4L2_DECODER_H__ +#define __GST_V4L2_DECODER_H__ + +#include <gst/gst.h> +#include <gst/video/video.h> + +#include "gstv4l2codecdevice.h" + +G_BEGIN_DECLS + +#define GST_TYPE_V4L2_DECODER gst_v4l2_decoder_get_type () +G_DECLARE_FINAL_TYPE (GstV4l2Decoder, gst_v4l2_decoder, GST, V4L2_DECODER, GstObject); + +GstV4l2Decoder * gst_v4l2_decoder_new (GstV4l2CodecDevice * device); + +gboolean gst_v4l2_decoder_open (GstV4l2Decoder * decoder); + +gboolean gst_v4l2_decoder_enum_input_fmt (GstV4l2Decoder * self, + gint i, guint32 * out_fmt); + +void gst_v4l2_decoder_install_properties (GObjectClass * gobject_class, + gint prop_offset, + GstV4l2CodecDevice * device); + +void gst_v4l2_decoder_set_property (GObject * object, guint prop_id, + const GValue * value, GParamSpec * pspec); + +void gst_v4l2_decoder_get_property (GObject * object, guint prop_id, + GValue * value, GParamSpec * pspec); + +G_END_DECLS + +#endif /* __GST_V4L2_DECODER_H__ */ diff --git a/sys/v4l2codecs/meson.build b/sys/v4l2codecs/meson.build index dcc9f38bf..c63668dac 100644 --- a/sys/v4l2codecs/meson.build +++ b/sys/v4l2codecs/meson.build @@ -1,6 +1,7 @@ v4l2codecs_sources = [ 'plugin.c', 'gstv4l2codecdevice.c', + 'gstv4l2decoder.c', ] libgudev_dep = dependency('gudev-1.0', required: get_option('v4l2codecs')) |