This introduces the skeleton of the H264 decoder. The plugin will list the devices and register a subclass of the GstV4L2CodecH264Dec base class. The subclass will pick the required specific information from the GstV4L2Device stored in the subclass structure.
215 lines
5.6 KiB
C
215 lines
5.6 KiB
C
/* GStreamer
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* Copyright (C) 2020 Nicolas Dufresne <nicolas.dufresne@collabora.com>
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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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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "gstv4l2decoder.h"
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#include "linux/media.h"
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#include "linux/videodev2.h"
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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GST_DEBUG_CATEGORY (v4l2_decoder_debug);
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#define GST_CAT_DEFAULT v4l2_decoder_debug
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enum
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{
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PROP_0,
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PROP_MEDIA_DEVICE,
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PROP_VIDEO_DEVICE,
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};
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struct _GstV4l2Decoder
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{
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GstObject parent;
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gboolean opened;
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gint media_fd;
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gint video_fd;
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/* properties */
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gchar *media_device;
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gchar *video_device;
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};
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G_DEFINE_TYPE_WITH_CODE (GstV4l2Decoder, gst_v4l2_decoder, GST_TYPE_OBJECT,
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GST_DEBUG_CATEGORY_INIT (v4l2_decoder_debug, "v4l2codecs-decoder", 0,
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"V4L2 stateless decoder helper"));
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static void
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gst_v4l2_decoder_finalize (GObject * obj)
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{
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GstV4l2Decoder *self = GST_V4L2_DECODER (obj);
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if (self->media_fd)
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close (self->media_fd);
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if (self->video_fd)
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close (self->media_fd);
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g_free (self->media_device);
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g_free (self->video_device);
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G_OBJECT_CLASS (gst_v4l2_decoder_parent_class)->finalize (obj);
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}
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static void
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gst_v4l2_decoder_init (GstV4l2Decoder * self)
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{
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}
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static void
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gst_v4l2_decoder_class_init (GstV4l2DecoderClass * klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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gobject_class->finalize = gst_v4l2_decoder_finalize;
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gobject_class->get_property = gst_v4l2_decoder_get_property;
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gobject_class->set_property = gst_v4l2_decoder_set_property;
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gst_v4l2_decoder_install_properties (gobject_class, 0, NULL);
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}
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GstV4l2Decoder *
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gst_v4l2_decoder_new (GstV4l2CodecDevice * device)
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{
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GstV4l2Decoder *decoder;
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g_return_val_if_fail (device->function == MEDIA_ENT_F_PROC_VIDEO_DECODER,
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NULL);
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decoder = g_object_new (GST_TYPE_V4L2_DECODER,
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"media-device", device->media_device_path,
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"video-device", device->video_device_path, NULL);
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return gst_object_ref_sink (decoder);
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}
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gboolean
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gst_v4l2_decoder_open (GstV4l2Decoder * self)
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{
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self->media_fd = open (self->media_device, 0);
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if (self->media_fd < 0) {
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GST_ERROR_OBJECT (self, "Failed to open '%s': %s",
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self->media_device, g_strerror (errno));
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return FALSE;
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}
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self->video_fd = open (self->video_device, 0);
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if (self->video_fd < 0) {
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GST_ERROR_OBJECT (self, "Failed to open '%s': %s",
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self->video_device, g_strerror (errno));
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return FALSE;
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}
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self->opened = TRUE;
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return TRUE;
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}
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gboolean
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gst_v4l2_decoder_enum_sink_fmt (GstV4l2Decoder * self, gint i,
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guint32 * out_fmt)
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{
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struct v4l2_fmtdesc fmtdesc = { i, V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE, };
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gint ret;
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g_return_val_if_fail (self->opened, FALSE);
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ret = ioctl (self->video_fd, VIDIOC_ENUM_FMT, &fmtdesc);
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if (ret < 0) {
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if (errno != EINVAL)
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GST_ERROR_OBJECT (self, "VIDIOC_ENUM_FMT failed: %s", g_strerror (errno));
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return FALSE;
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}
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GST_DEBUG_OBJECT (self, "Found format %" GST_FOURCC_FORMAT " (%s)",
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GST_FOURCC_ARGS (fmtdesc.pixelformat), fmtdesc.description);
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*out_fmt = fmtdesc.pixelformat;
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return TRUE;
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}
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void
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gst_v4l2_decoder_install_properties (GObjectClass * gobject_class,
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gint prop_offset, GstV4l2CodecDevice * device)
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{
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const gchar *media_device_path = NULL;
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const gchar *video_device_path = NULL;
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if (device) {
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media_device_path = device->media_device_path;
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video_device_path = device->video_device_path;
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}
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g_object_class_install_property (gobject_class, PROP_MEDIA_DEVICE,
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g_param_spec_string ("media-device", "Media Device Path",
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"Path to the media device node", media_device_path,
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G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_VIDEO_DEVICE,
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g_param_spec_string ("video-device", "Video Device Path",
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"Path to the video device node", video_device_path,
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G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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}
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void
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gst_v4l2_decoder_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstV4l2Decoder *self = GST_V4L2_DECODER (object);
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switch (prop_id) {
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case PROP_MEDIA_DEVICE:
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g_free (self->media_device);
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self->media_device = g_value_dup_string (value);
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break;
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case PROP_VIDEO_DEVICE:
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g_free (self->video_device);
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self->video_device = g_value_dup_string (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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void
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gst_v4l2_decoder_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstV4l2Decoder *self = GST_V4L2_DECODER (object);
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switch (prop_id) {
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case PROP_MEDIA_DEVICE:
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g_value_set_string (value, self->media_device);
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break;
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case PROP_VIDEO_DEVICE:
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g_value_set_string (value, self->video_device);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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