gstreamer/gst/autodetect/gstautodetect.c
2021-03-29 12:45:22 +02:00

482 lines
14 KiB
C

/* GStreamer
* (c) 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
*
* 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 <stdio.h>
#include <string.h>
#include <gst/gst.h>
#include "gstautodetect.h"
#define DEFAULT_SYNC TRUE
/* Properties */
enum
{
PROP_0,
PROP_CAPS,
PROP_SYNC,
};
static GstStateChangeReturn gst_auto_detect_change_state (GstElement * element,
GstStateChange transition);
static void gst_auto_detect_constructed (GObject * object);
static void gst_auto_detect_dispose (GObject * self);
static void gst_auto_detect_clear_kid (GstAutoDetect * self);
static void gst_auto_detect_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_auto_detect_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
#define gst_auto_detect_parent_class parent_class
G_DEFINE_ABSTRACT_TYPE (GstAutoDetect, gst_auto_detect, GST_TYPE_BIN);
static void
gst_auto_detect_class_init (GstAutoDetectClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *eklass;
gobject_class = G_OBJECT_CLASS (klass);
eklass = GST_ELEMENT_CLASS (klass);
gobject_class->constructed = gst_auto_detect_constructed;
gobject_class->dispose = gst_auto_detect_dispose;
gobject_class->set_property = gst_auto_detect_set_property;
gobject_class->get_property = gst_auto_detect_get_property;
eklass->change_state = GST_DEBUG_FUNCPTR (gst_auto_detect_change_state);
/**
* GstAutoDetect:filter-caps:
*
* This property will filter out candidate sinks that can handle the specified
* caps. By default only elements that support uncompressed data are selected.
*
* This property can only be set before the element goes to the READY state.
*/
g_object_class_install_property (gobject_class, PROP_CAPS,
g_param_spec_boxed ("filter-caps", "Filter caps",
"Filter sink candidates using these caps.", GST_TYPE_CAPS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
GST_PARAM_DOC_SHOW_DEFAULT));
g_object_class_install_property (gobject_class, PROP_SYNC,
g_param_spec_boolean ("sync", "Sync",
"Sync on the clock", DEFAULT_SYNC,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_type_mark_as_plugin_api (GST_TYPE_AUTO_DETECT, 0);
}
static void
gst_auto_detect_dispose (GObject * object)
{
GstAutoDetect *self = GST_AUTO_DETECT (object);
gst_auto_detect_clear_kid (self);
if (self->filter_caps)
gst_caps_unref (self->filter_caps);
self->filter_caps = NULL;
G_OBJECT_CLASS (parent_class)->dispose ((GObject *) self);
}
static void
gst_auto_detect_clear_kid (GstAutoDetect * self)
{
if (self->kid) {
gst_element_set_state (self->kid, GST_STATE_NULL);
gst_bin_remove (GST_BIN (self), self->kid);
self->kid = NULL;
}
}
static GstElement *
gst_auto_detect_create_fake_element_default (GstAutoDetect * self)
{
GstElement *fake;
gchar dummy_factory[10], dummy_name[20];
sprintf (dummy_factory, "fake%s", self->type_klass_lc);
sprintf (dummy_name, "fake-%s-%s", self->media_klass_lc, self->type_klass_lc);
fake = gst_element_factory_make (dummy_factory, dummy_name);
g_object_set (fake, "sync", self->sync, NULL);
return fake;
}
static GstElement *
gst_auto_detect_create_fake_element (GstAutoDetect * self)
{
GstAutoDetectClass *klass = GST_AUTO_DETECT_GET_CLASS (self);
GstElement *fake;
if (klass->create_fake_element)
fake = klass->create_fake_element (self);
else
fake = gst_auto_detect_create_fake_element_default (self);
return fake;
}
static gboolean
gst_auto_detect_attach_ghost_pad (GstAutoDetect * self)
{
GstPad *target = gst_element_get_static_pad (self->kid, self->type_klass_lc);
gboolean res = gst_ghost_pad_set_target (GST_GHOST_PAD (self->pad), target);
gst_object_unref (target);
return res;
}
/* Hack to make initial linking work; ideally, this would work even when
* no target has been assigned to the ghostpad yet. */
static void
gst_auto_detect_reset (GstAutoDetect * self)
{
gst_auto_detect_clear_kid (self);
/* placeholder element */
self->kid = gst_auto_detect_create_fake_element (self);
gst_bin_add (GST_BIN (self), self->kid);
gst_auto_detect_attach_ghost_pad (self);
}
static GstStaticCaps raw_audio_caps = GST_STATIC_CAPS ("audio/x-raw");
static GstStaticCaps raw_video_caps = GST_STATIC_CAPS ("video/x-raw");
static void
gst_auto_detect_init (GstAutoDetect * self)
{
self->sync = DEFAULT_SYNC;
}
static void
gst_auto_detect_constructed (GObject * object)
{
GstAutoDetect *self = GST_AUTO_DETECT (object);
gboolean is_audio;
if (G_OBJECT_CLASS (parent_class)->constructed)
G_OBJECT_CLASS (parent_class)->constructed (object);
is_audio = !g_strcmp0 (self->media_klass, "Audio");
self->type_klass = (self->flag == GST_ELEMENT_FLAG_SINK) ? "Sink" : "Source";
self->type_klass_lc = (self->flag == GST_ELEMENT_FLAG_SINK) ? "sink" : "src";
self->media_klass_lc = is_audio ? "audio" : "video";
/* set the default raw caps */
self->filter_caps = gst_static_caps_get (is_audio ? &raw_audio_caps :
&raw_video_caps);
self->pad = gst_ghost_pad_new_no_target (self->type_klass_lc,
(self->flag == GST_ELEMENT_FLAG_SINK) ? GST_PAD_SINK : GST_PAD_SRC);
gst_element_add_pad (GST_ELEMENT (self), self->pad);
gst_auto_detect_reset (self);
/* mark element type */
GST_OBJECT_FLAG_SET (self, self->flag);
gst_bin_set_suppressed_flags (GST_BIN (self),
GST_ELEMENT_FLAG_SOURCE | GST_ELEMENT_FLAG_SINK);
}
static gboolean
gst_auto_detect_factory_filter (GstPluginFeature * feature, gpointer data)
{
GstAutoDetect *self = (GstAutoDetect *) data;
guint rank;
const gchar *klass;
/* we only care about element factories */
if (!GST_IS_ELEMENT_FACTORY (feature))
return FALSE;
/* audio sinks */
klass = gst_element_factory_get_metadata (GST_ELEMENT_FACTORY (feature),
GST_ELEMENT_METADATA_KLASS);
if (!(strstr (klass, self->type_klass) && strstr (klass, self->media_klass)))
return FALSE;
/* only select elements with autoplugging rank */
rank = gst_plugin_feature_get_rank (feature);
if (rank < GST_RANK_MARGINAL)
return FALSE;
return TRUE;
}
static GstElement *
create_element_with_pretty_name (GstAutoDetect * self,
GstElementFactory * factory)
{
GstElement *element;
gchar *name, *marker;
marker = g_strdup (GST_OBJECT_NAME (factory));
if (g_str_has_suffix (marker, self->type_klass_lc))
marker[strlen (marker) - 4] = '\0';
if (g_str_has_prefix (marker, "gst"))
memmove (marker, marker + 3, strlen (marker + 3) + 1);
name = g_strdup_printf ("%s-actual-%s-%s", GST_OBJECT_NAME (self),
self->type_klass_lc, marker);
g_free (marker);
element = gst_element_factory_create (factory, name);
g_free (name);
return element;
}
static GstElement *
gst_auto_detect_find_best (GstAutoDetect * self)
{
GList *list, *item;
GstElement *choice = NULL;
GstMessage *message = NULL;
GSList *errors = NULL;
GstBus *bus = gst_bus_new ();
GstPad *el_pad = NULL;
GstCaps *el_caps = NULL;
gboolean no_match = TRUE;
/* We don't treat sound server sinks special. Our policy is that sound
* server sinks that have a rank must not auto-spawn a daemon under any
* circumstances, so there's nothing for us to worry about here */
list = gst_registry_feature_filter (gst_registry_get (),
(GstPluginFeatureFilter) gst_auto_detect_factory_filter, FALSE, self);
list =
g_list_sort (list, (GCompareFunc) gst_plugin_feature_rank_compare_func);
GST_LOG_OBJECT (self, "Trying to find usable %s elements ...",
self->media_klass_lc);
for (item = list; item != NULL; item = item->next) {
GstElementFactory *f = GST_ELEMENT_FACTORY (item->data);
GstElement *el;
if ((el = create_element_with_pretty_name (self, f))) {
GstStateChangeReturn ret;
GST_DEBUG_OBJECT (self, "Testing %s", GST_OBJECT_NAME (f));
/* If autodetect has been provided with filter caps,
* accept only elements that match with the filter caps */
if (self->filter_caps) {
el_pad = gst_element_get_static_pad (el, self->type_klass_lc);
el_caps = gst_pad_query_caps (el_pad, NULL);
gst_object_unref (el_pad);
GST_DEBUG_OBJECT (self,
"Checking caps: %" GST_PTR_FORMAT " vs. %" GST_PTR_FORMAT,
self->filter_caps, el_caps);
no_match = !gst_caps_can_intersect (self->filter_caps, el_caps);
gst_caps_unref (el_caps);
if (no_match) {
GST_DEBUG_OBJECT (self, "Incompatible caps");
gst_object_unref (el);
continue;
} else {
GST_DEBUG_OBJECT (self, "Found compatible caps");
}
}
gst_element_set_bus (el, bus);
ret = gst_element_set_state (el, GST_STATE_READY);
if (ret == GST_STATE_CHANGE_SUCCESS) {
GST_DEBUG_OBJECT (self, "This worked!");
gst_element_set_state (el, GST_STATE_NULL);
choice = el;
break;
}
/* collect all error messages */
while ((message = gst_bus_pop_filtered (bus, GST_MESSAGE_ERROR))) {
GST_DEBUG_OBJECT (self, "error message %" GST_PTR_FORMAT, message);
errors = g_slist_append (errors, message);
}
gst_element_set_state (el, GST_STATE_NULL);
gst_object_unref (el);
}
}
GST_DEBUG_OBJECT (self, "done trying");
if (!choice) {
/* We post a warning and plug a fake-element. This is convenient for running
* tests without requiring hardware src/sinks. */
if (errors) {
GError *err = NULL;
gchar *dbg = NULL;
/* FIXME: we forward the first message for now; but later on it might make
* sense to forward all so that apps can actually analyse them. */
gst_message_parse_error (GST_MESSAGE (errors->data), &err, &dbg);
gst_element_post_message (GST_ELEMENT_CAST (self),
gst_message_new_warning (GST_OBJECT_CAST (self), err, dbg));
g_error_free (err);
g_free (dbg);
} else {
/* send warning message to application and use a fakesrc */
GST_ELEMENT_WARNING (self, RESOURCE, NOT_FOUND, (NULL),
("Failed to find a usable %s %s", self->media_klass_lc,
self->type_klass_lc));
}
choice = gst_auto_detect_create_fake_element (self);
gst_element_set_state (choice, GST_STATE_READY);
}
gst_object_unref (bus);
gst_plugin_feature_list_free (list);
g_slist_foreach (errors, (GFunc) gst_mini_object_unref, NULL);
g_slist_free (errors);
return choice;
}
static gboolean
gst_auto_detect_detect (GstAutoDetect * self)
{
GstElement *kid;
GstAutoDetectClass *klass = GST_AUTO_DETECT_GET_CLASS (self);
gst_auto_detect_clear_kid (self);
/* find element */
GST_DEBUG_OBJECT (self, "Creating new kid");
if (!(kid = gst_auto_detect_find_best (self)))
goto no_sink;
self->has_sync =
g_object_class_find_property (G_OBJECT_GET_CLASS (kid), "sync") != NULL;
if (self->has_sync)
g_object_set (G_OBJECT (kid), "sync", self->sync, NULL);
if (klass->configure) {
klass->configure (self, kid);
}
self->kid = kid;
gst_bin_add (GST_BIN (self), kid);
/* Ensure the child is brought up to the right state to match the parent. */
if (GST_STATE (self->kid) < GST_STATE (self))
gst_element_set_state (self->kid, GST_STATE (self));
/* attach ghost pad */
GST_DEBUG_OBJECT (self, "Re-assigning ghostpad");
if (!gst_auto_detect_attach_ghost_pad (self))
goto target_failed;
GST_DEBUG_OBJECT (self, "done changing auto %s %s", self->media_klass_lc,
self->type_klass_lc);
return TRUE;
/* ERRORS */
no_sink:
{
GST_ELEMENT_ERROR (self, LIBRARY, INIT, (NULL),
("Failed to find a supported audio sink"));
return FALSE;
}
target_failed:
{
GST_ELEMENT_ERROR (self, LIBRARY, INIT, (NULL),
("Failed to set target pad"));
return FALSE;
}
}
static GstStateChangeReturn
gst_auto_detect_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
GstAutoDetect *sink = GST_AUTO_DETECT (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
if (!gst_auto_detect_detect (sink))
return GST_STATE_CHANGE_FAILURE;
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (ret == GST_STATE_CHANGE_FAILURE)
return ret;
switch (transition) {
case GST_STATE_CHANGE_READY_TO_NULL:
gst_auto_detect_reset (sink);
break;
default:
break;
}
return ret;
}
static void
gst_auto_detect_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstAutoDetect *self = GST_AUTO_DETECT (object);
switch (prop_id) {
case PROP_CAPS:
if (self->filter_caps)
gst_caps_unref (self->filter_caps);
self->filter_caps = gst_caps_copy (gst_value_get_caps (value));
break;
case PROP_SYNC:
self->sync = g_value_get_boolean (value);
if (self->kid && self->has_sync)
g_object_set_property (G_OBJECT (self->kid), pspec->name, value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_auto_detect_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstAutoDetect *self = GST_AUTO_DETECT (object);
switch (prop_id) {
case PROP_CAPS:
gst_value_set_caps (value, self->filter_caps);
break;
case PROP_SYNC:
g_value_set_boolean (value, self->sync);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}