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