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v4l2videodec: Implement stable element names

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Before that, each m2m node would be wrapped as a single, multi-format
decoder element. As a unique name was needed, we where using the device
name, which changes between re-boots. This led to unpredictable element
names. In this patch, we generate an element per codec, using
v4l2<codec>dec name. If there is multiple decoder for the same format,
the following elements will be named v4l2<node><codec>dec.

https://bugzilla.gnome.org/show_bug.cgi?id=784908
This commit is contained in:
Nicolas Dufresne 2017-07-13 12:32:00 -04:00
parent d0dfbb04c0
commit 724a3ceec5
1 changed files with 104 additions and 28 deletions
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132
sys/v4l2/gstv4l2videodec.c
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@ -1,6 +1,6 @@
/*
* Copyright (C) 2014 Collabora Ltd.
* Author: Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>
* Author: 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
@ -43,6 +43,8 @@ typedef struct
gchar *device;
GstCaps *sink_caps;
GstCaps *src_caps;
const gchar *longname;
const gchar *description;
} GstV4l2VideoDecCData;
enum
@ -916,12 +918,6 @@ gst_v4l2_video_dec_class_init (GstV4l2VideoDecClass * klass)
GST_DEBUG_CATEGORY_INIT (gst_v4l2_video_dec_debug, "v4l2videodec", 0,
"V4L2 Video Decoder");
gst_element_class_set_static_metadata (element_class,
"V4L2 Video Decoder",
"Codec/Decoder/Video",
"Decode video streams via V4L2 API",
"Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>");
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_dispose);
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_finalize);
gobject_class->set_property =
@ -974,6 +970,10 @@ gst_v4l2_video_dec_subclass_init (gpointer g_class, gpointer data)
gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
cdata->src_caps));
gst_element_class_set_static_metadata (element_class, cdata->longname,
"Codec/Decoder/Video", cdata->description,
"Nicolas Dufresne <nicolas.dufresne@collabora.com>");
g_free (cdata);
}
@ -990,36 +990,112 @@ gst_v4l2_is_video_dec (GstCaps * sink_caps, GstCaps * src_caps)
return ret;
}
static gchar *
gst_v4l2_video_dec_set_metadata (GstStructure * s, GstV4l2VideoDecCData * cdata,
const gchar * basename)
{
gchar *codec_name = NULL;
gchar *type_name = NULL;
#define SET_META(codec) \
G_STMT_START { \
cdata->longname = "V4L2 " codec " Decoder"; \
cdata->description = "Decodes " codec " streams via V4L2 API"; \
codec_name = g_ascii_strdown (codec, -1); \
} G_STMT_END
if (gst_structure_has_name (s, "image/jpeg")) {
SET_META ("JPEG");
} else if (gst_structure_has_name (s, "video/mpeg")) {
gint mpegversion = 0;
gst_structure_get_int (s, "mpegversion", &mpegversion);
if (mpegversion == 2) {
SET_META ("MPEG2");
} else {
SET_META ("MPEG4");
}
} else if (gst_structure_has_name (s, "video/x-h263")) {
SET_META ("H263");
} else if (gst_structure_has_name (s, "video/x-h264")) {
SET_META ("H264");
} else if (gst_structure_has_name (s, "video/x-wmv")) {
SET_META ("VC1");
} else if (gst_structure_has_name (s, "video/x-vp8")) {
SET_META ("VP8");
} else if (gst_structure_has_name (s, "video/x-bayer")) {
SET_META ("BAYER");
} else if (gst_structure_has_name (s, "video/x-sonix")) {
SET_META ("SONIX");
} else if (gst_structure_has_name (s, "video/x-pwc1")) {
SET_META ("PWC1");
} else if (gst_structure_has_name (s, "video/x-pwc2")) {
SET_META ("PWC2");
} else {
/* This code should be kept on sync with the exposed CODEC type of format
* from gstv4l2object.c. This warning will only occure in case we forget
* to also add a format here. */
gchar *s_str = gst_structure_to_string (s);
g_warning ("Missing fixed name mapping for caps '%s', this is a GStreamer "
"bug, please report at https://bugs.gnome.org", s_str);
g_free (s_str);
}
if (codec_name) {
type_name = g_strdup_printf ("v4l2%sdec", codec_name);
if (g_type_from_name (type_name) != 0) {
g_free (type_name);
type_name = g_strdup_printf ("v4l2%s%sdec", basename, codec_name);
}
}
return type_name;
#undef SET_META
}
gboolean
gst_v4l2_video_dec_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;
GstV4l2VideoDecCData *cdata;
gint i;
cdata = g_new0 (GstV4l2VideoDecCData, 1);
cdata->device = g_strdup (device_path);
cdata->sink_caps = gst_caps_ref (sink_caps);
cdata->src_caps = gst_caps_ref (src_caps);
for (i = 0; i < gst_caps_get_size (sink_caps); i++) {
GstV4l2VideoDecCData *cdata;
GstStructure *s;
GTypeQuery type_query;
GTypeInfo type_info = { 0, };
GType type, subtype;
gchar *type_name;
type = gst_v4l2_video_dec_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_video_dec_subclass_init;
type_info.class_data = cdata;
type_info.instance_init = gst_v4l2_video_dec_subinstance_init;
s = gst_caps_get_structure (sink_caps, i);
type_name = g_strdup_printf ("v4l2%sdec", basename);
subtype = g_type_register_static (type, type_name, &type_info, 0);
cdata = g_new0 (GstV4l2VideoDecCData, 1);
cdata->device = g_strdup (device_path);
cdata->sink_caps = gst_caps_new_empty ();
gst_caps_append_structure (cdata->sink_caps, gst_structure_copy (s));
cdata->src_caps = gst_caps_ref (src_caps);
type_name = gst_v4l2_video_dec_set_metadata (s, cdata, basename);
gst_element_register (plugin, type_name, GST_RANK_PRIMARY + 1, subtype);
/* Skip over if we hit an unmapped type */
if (!type_name) {
g_free (cdata);
continue;
}
g_free (type_name);
type = gst_v4l2_video_dec_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_video_dec_subclass_init;
type_info.class_data = cdata;
type_info.instance_init = gst_v4l2_video_dec_subinstance_init;
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;
}