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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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There's not much point in using GST_DEBUG_FUNCPTR with GObject virtual functions such as get_property, set_propery, finalize and dispose, since they'll never be used by anyone anyway. Saves a few bytes and possibly a tenth of a polar bear.
939 lines
28 KiB
C
939 lines
28 KiB
C
/* GStreamer
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* Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
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*
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* gsttypefindelement.c: element that detects type of stream
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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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:element-typefind
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*
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* Determines the media-type of a stream. It applies typefind functions in the
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* order of their rank. One the type has been deteted it sets its src pad caps
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* to the found media type.
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*
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* Plugins can register custom typefinders by using #GstTypeFindFactory.
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*/
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/* FIXME: need a better solution for non-seekable streams */
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/* way of operation:
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* 1) get a list of all typefind functions sorted best to worst
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* 2) if all elements have been called with all requested data goto 8
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* 3) call all functions once with all available data
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* 4) if a function returns a value >= PROP_MAXIMUM goto 8
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* 5) all functions with a result > PROP_MINIMUM or functions that did not get
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* all requested data (where peek returned NULL) stay in list
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* 6) seek to requested offset of best function that still has open data
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* requests
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* 7) goto 2
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* 8) take best available result and use its caps
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*
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* The element has two scheduling modes:
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*
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* 1) chain based, it will collect buffers and run the typefind function on
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* the buffer until something is found.
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* 2) getrange based, it will proxy the getrange function to the sinkpad. It
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* is assumed that the peer element is happy with whatever format we
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* eventually read.
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*
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* When the element has no connected srcpad, and the sinkpad can operate in
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* getrange based mode, the element starts its own task to figure out the
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* type of the stream.
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*
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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 "gsttypefindelement.h"
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#include "gst/gst_private.h"
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#include "gst/gst-i18n-lib.h"
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#include "gst/base/gsttypefindhelper.h"
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#include <gst/gsttypefind.h>
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#include <gst/gstutils.h>
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#include <gst/gsterror.h>
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GST_DEBUG_CATEGORY_STATIC (gst_type_find_element_debug);
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#define GST_CAT_DEFAULT gst_type_find_element_debug
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/* generic templates */
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static GstStaticPadTemplate type_find_element_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS_ANY);
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static GstStaticPadTemplate type_find_element_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS_ANY);
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/* Require at least 2kB of data before we attempt typefinding in chain-mode.
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* 128kB is massive overkill for the maximum, but doesn't do any harm */
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#define TYPE_FIND_MIN_SIZE (2*1024)
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#define TYPE_FIND_MAX_SIZE (128*1024)
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/* TypeFind signals and args */
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enum
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{
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HAVE_TYPE,
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LAST_SIGNAL
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};
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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_MINIMUM,
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PROP_MAXIMUM,
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PROP_FORCE_CAPS,
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PROP_LAST
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};
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enum
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{
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MODE_NORMAL, /* act as identity */
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MODE_TYPEFIND, /* do typefinding */
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MODE_ERROR /* had fatal error */
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};
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#define _do_init(bla) \
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GST_DEBUG_CATEGORY_INIT (gst_type_find_element_debug, "typefind", \
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GST_DEBUG_BG_YELLOW | GST_DEBUG_FG_GREEN, "type finding element");
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GST_BOILERPLATE_FULL (GstTypeFindElement, gst_type_find_element, GstElement,
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GST_TYPE_ELEMENT, _do_init);
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static void gst_type_find_element_dispose (GObject * object);
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static void gst_type_find_element_set_property (GObject * object,
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guint prop_id, const GValue * value, GParamSpec * pspec);
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static void gst_type_find_element_get_property (GObject * object,
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guint prop_id, GValue * value, GParamSpec * pspec);
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#if 0
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static const GstEventMask *gst_type_find_element_src_event_mask (GstPad * pad);
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#endif
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static gboolean gst_type_find_element_src_event (GstPad * pad,
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GstEvent * event);
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static gboolean gst_type_find_handle_src_query (GstPad * pad, GstQuery * query);
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static gboolean gst_type_find_element_handle_event (GstPad * pad,
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GstEvent * event);
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static gboolean gst_type_find_element_setcaps (GstPad * pad, GstCaps * caps);
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static GstFlowReturn gst_type_find_element_chain (GstPad * sinkpad,
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GstBuffer * buffer);
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static GstFlowReturn gst_type_find_element_getrange (GstPad * srcpad,
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guint64 offset, guint length, GstBuffer ** buffer);
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static gboolean gst_type_find_element_checkgetrange (GstPad * srcpad);
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static GstStateChangeReturn
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gst_type_find_element_change_state (GstElement * element,
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GstStateChange transition);
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static gboolean gst_type_find_element_activate (GstPad * pad);
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static gboolean
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gst_type_find_element_activate_src_pull (GstPad * pad, gboolean active);
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static GstFlowReturn
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gst_type_find_element_chain_do_typefinding (GstTypeFindElement * typefind);
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static void
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gst_type_find_element_send_cached_events (GstTypeFindElement * typefind);
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static guint gst_type_find_element_signals[LAST_SIGNAL] = { 0 };
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static void
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gst_type_find_element_have_type (GstTypeFindElement * typefind,
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guint probability, const GstCaps * caps)
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{
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g_assert (caps != NULL);
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GST_INFO_OBJECT (typefind, "found caps %" GST_PTR_FORMAT ", probability=%u",
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caps, probability);
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if (typefind->caps)
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gst_caps_unref (typefind->caps);
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typefind->caps = gst_caps_copy (caps);
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gst_pad_set_caps (typefind->src, (GstCaps *) caps);
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}
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static void
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gst_type_find_element_base_init (gpointer g_class)
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{
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GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_set_details_simple (gstelement_class,
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"TypeFind",
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"Generic",
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"Finds the media type of a stream",
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"Benjamin Otte <in7y118@public.uni-hamburg.de>");
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&type_find_element_src_template));
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&type_find_element_sink_template));
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}
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static void
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gst_type_find_element_class_init (GstTypeFindElementClass * typefind_class)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (typefind_class);
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GstElementClass *gstelement_class = GST_ELEMENT_CLASS (typefind_class);
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gobject_class->set_property = gst_type_find_element_set_property;
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gobject_class->get_property = gst_type_find_element_get_property;
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gobject_class->dispose = gst_type_find_element_dispose;
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g_object_class_install_property (gobject_class, PROP_CAPS,
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g_param_spec_boxed ("caps", _("caps"),
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_("detected capabilities in stream"), gst_caps_get_type (),
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G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_MINIMUM,
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g_param_spec_uint ("minimum", _("minimum"),
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"minimum probability required to accept caps", GST_TYPE_FIND_MINIMUM,
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GST_TYPE_FIND_MAXIMUM, GST_TYPE_FIND_MINIMUM,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_MAXIMUM,
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g_param_spec_uint ("maximum", _("maximum"),
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"probability to stop typefinding (deprecated; non-functional)",
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GST_TYPE_FIND_MINIMUM, GST_TYPE_FIND_MAXIMUM, GST_TYPE_FIND_MAXIMUM,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_FORCE_CAPS,
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g_param_spec_boxed ("force-caps", _("force caps"),
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_("force caps without doing a typefind"), gst_caps_get_type (),
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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/**
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* GstTypeFindElement::have-type:
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* @typefind: the typefind instance
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* @probability: the probability of the type found
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* @caps: the caps of the type found
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*
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* This signal gets emitted when the type and its probability has
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* been found.
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*/
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gst_type_find_element_signals[HAVE_TYPE] = g_signal_new ("have_type",
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G_TYPE_FROM_CLASS (typefind_class), G_SIGNAL_RUN_FIRST,
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G_STRUCT_OFFSET (GstTypeFindElementClass, have_type), NULL, NULL,
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gst_marshal_VOID__UINT_BOXED, G_TYPE_NONE, 2,
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G_TYPE_UINT, GST_TYPE_CAPS | G_SIGNAL_TYPE_STATIC_SCOPE);
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typefind_class->have_type =
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GST_DEBUG_FUNCPTR (gst_type_find_element_have_type);
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gstelement_class->change_state =
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GST_DEBUG_FUNCPTR (gst_type_find_element_change_state);
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}
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static void
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gst_type_find_element_init (GstTypeFindElement * typefind,
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GstTypeFindElementClass * g_class)
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{
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/* sinkpad */
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typefind->sink =
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gst_pad_new_from_static_template (&type_find_element_sink_template,
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"sink");
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gst_pad_set_activate_function (typefind->sink,
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GST_DEBUG_FUNCPTR (gst_type_find_element_activate));
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gst_pad_set_setcaps_function (typefind->sink,
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GST_DEBUG_FUNCPTR (gst_type_find_element_setcaps));
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gst_pad_set_chain_function (typefind->sink,
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GST_DEBUG_FUNCPTR (gst_type_find_element_chain));
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gst_pad_set_event_function (typefind->sink,
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GST_DEBUG_FUNCPTR (gst_type_find_element_handle_event));
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gst_element_add_pad (GST_ELEMENT (typefind), typefind->sink);
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/* srcpad */
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typefind->src =
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gst_pad_new_from_static_template (&type_find_element_src_template, "src");
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gst_pad_set_activatepull_function (typefind->src,
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GST_DEBUG_FUNCPTR (gst_type_find_element_activate_src_pull));
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gst_pad_set_checkgetrange_function (typefind->src,
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GST_DEBUG_FUNCPTR (gst_type_find_element_checkgetrange));
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gst_pad_set_getrange_function (typefind->src,
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GST_DEBUG_FUNCPTR (gst_type_find_element_getrange));
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gst_pad_set_event_function (typefind->src,
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GST_DEBUG_FUNCPTR (gst_type_find_element_src_event));
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gst_pad_set_query_function (typefind->src,
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GST_DEBUG_FUNCPTR (gst_type_find_handle_src_query));
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gst_pad_use_fixed_caps (typefind->src);
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gst_element_add_pad (GST_ELEMENT (typefind), typefind->src);
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typefind->mode = MODE_TYPEFIND;
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typefind->caps = NULL;
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typefind->min_probability = 1;
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typefind->max_probability = GST_TYPE_FIND_MAXIMUM;
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typefind->store = NULL;
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}
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static void
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gst_type_find_element_dispose (GObject * object)
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{
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GstTypeFindElement *typefind = GST_TYPE_FIND_ELEMENT (object);
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if (typefind->store) {
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gst_buffer_unref (typefind->store);
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typefind->store = NULL;
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}
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if (typefind->force_caps) {
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gst_caps_unref (typefind->force_caps);
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typefind->force_caps = NULL;
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}
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G_OBJECT_CLASS (parent_class)->dispose (object);
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}
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static void
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gst_type_find_element_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstTypeFindElement *typefind;
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typefind = GST_TYPE_FIND_ELEMENT (object);
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switch (prop_id) {
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case PROP_MINIMUM:
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typefind->min_probability = g_value_get_uint (value);
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break;
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case PROP_MAXIMUM:
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typefind->max_probability = g_value_get_uint (value);
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break;
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case PROP_FORCE_CAPS:
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GST_OBJECT_LOCK (typefind);
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if (typefind->force_caps)
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gst_caps_unref (typefind->force_caps);
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typefind->force_caps = g_value_dup_boxed (value);
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GST_OBJECT_UNLOCK (typefind);
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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_type_find_element_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstTypeFindElement *typefind;
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typefind = GST_TYPE_FIND_ELEMENT (object);
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switch (prop_id) {
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case PROP_CAPS:
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g_value_set_boxed (value, typefind->caps);
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break;
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case PROP_MINIMUM:
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g_value_set_uint (value, typefind->min_probability);
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break;
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case PROP_MAXIMUM:
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g_value_set_uint (value, typefind->max_probability);
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break;
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case PROP_FORCE_CAPS:
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GST_OBJECT_LOCK (typefind);
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g_value_set_boxed (value, typefind->force_caps);
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GST_OBJECT_UNLOCK (typefind);
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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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gst_type_find_handle_src_query (GstPad * pad, GstQuery * query)
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{
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GstTypeFindElement *typefind;
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gboolean res = FALSE;
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GstPad *peer;
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typefind = GST_TYPE_FIND_ELEMENT (GST_PAD_PARENT (pad));
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peer = gst_pad_get_peer (typefind->sink);
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if (peer == NULL)
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return FALSE;
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res = gst_pad_query (peer, query);
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if (!res)
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goto out;
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switch (GST_QUERY_TYPE (query)) {
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case GST_QUERY_POSITION:
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{
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gint64 peer_pos;
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GstFormat format;
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if (typefind->store == NULL)
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goto out;
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gst_query_parse_position (query, &format, &peer_pos);
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/* FIXME: this code assumes that there's no discont in the queue */
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switch (format) {
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case GST_FORMAT_BYTES:
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peer_pos -= GST_BUFFER_SIZE (typefind->store);
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break;
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default:
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/* FIXME */
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break;
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}
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gst_query_set_position (query, format, peer_pos);
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break;
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}
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default:
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break;
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}
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out:
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gst_object_unref (peer);
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return res;
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}
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#if 0
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static const GstEventMask *
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gst_type_find_element_src_event_mask (GstPad * pad)
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{
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static const GstEventMask mask[] = {
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{GST_EVENT_SEEK,
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GST_SEEK_METHOD_SET | GST_SEEK_METHOD_CUR | GST_SEEK_METHOD_END |
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GST_SEEK_FLAG_FLUSH},
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/* add more if you want, event masks suck and need to die anyway */
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{0,}
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};
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return mask;
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}
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#endif
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static gboolean
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gst_type_find_element_src_event (GstPad * pad, GstEvent * event)
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{
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GstTypeFindElement *typefind = GST_TYPE_FIND_ELEMENT (GST_PAD_PARENT (pad));
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if (typefind->mode != MODE_NORMAL) {
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/* need to do more? */
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gst_mini_object_unref (GST_MINI_OBJECT (event));
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return FALSE;
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}
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return gst_pad_push_event (typefind->sink, event);
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}
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static void
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start_typefinding (GstTypeFindElement * typefind)
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{
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GST_DEBUG_OBJECT (typefind, "starting typefinding");
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gst_pad_set_caps (typefind->src, NULL);
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if (typefind->caps) {
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gst_caps_replace (&typefind->caps, NULL);
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}
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typefind->mode = MODE_TYPEFIND;
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}
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static void
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stop_typefinding (GstTypeFindElement * typefind)
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{
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GstState state;
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gboolean push_cached_buffers;
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gst_element_get_state (GST_ELEMENT (typefind), &state, NULL, 0);
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push_cached_buffers = (state >= GST_STATE_PAUSED);
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GST_DEBUG_OBJECT (typefind, "stopping typefinding%s",
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push_cached_buffers ? " and pushing cached buffers" : "");
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|
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if (typefind->store) {
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if (!push_cached_buffers) {
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gst_buffer_unref (typefind->store);
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} else {
|
|
GstPad *peer = gst_pad_get_peer (typefind->src);
|
|
|
|
typefind->mode = MODE_NORMAL;
|
|
gst_buffer_set_caps (typefind->store, typefind->caps);
|
|
|
|
/* make sure the user gets a meaningful error message in this case,
|
|
* which is not a core bug or bug of any kind (as the default error
|
|
* message emitted by gstpad.c otherwise would make you think) */
|
|
if (peer && GST_PAD_CHAINFUNC (peer) == NULL) {
|
|
GST_DEBUG_OBJECT (typefind, "upstream only supports push mode, while "
|
|
"downstream element only works in pull mode, erroring out");
|
|
GST_ELEMENT_ERROR (typefind, STREAM, FAILED,
|
|
("%s cannot work in push mode. The operation is not supported "
|
|
"with this source element or protocol.",
|
|
G_OBJECT_TYPE_NAME (GST_PAD_PARENT (peer))),
|
|
("Downstream pad %s:%s has no chainfunction, and the upstream "
|
|
"element does not support pull mode",
|
|
GST_DEBUG_PAD_NAME (peer)));
|
|
typefind->mode = MODE_ERROR; /* make the chain function error out */
|
|
} else {
|
|
gst_type_find_element_send_cached_events (typefind);
|
|
gst_pad_push (typefind->src, typefind->store);
|
|
}
|
|
|
|
if (peer)
|
|
gst_object_unref (peer);
|
|
}
|
|
typefind->store = NULL;
|
|
}
|
|
}
|
|
|
|
static gboolean
|
|
gst_type_find_element_handle_event (GstPad * pad, GstEvent * event)
|
|
{
|
|
gboolean res = FALSE;
|
|
GstTypeFindElement *typefind = GST_TYPE_FIND_ELEMENT (GST_PAD_PARENT (pad));
|
|
|
|
GST_DEBUG_OBJECT (typefind, "got %s event in mode %d",
|
|
GST_EVENT_TYPE_NAME (event), typefind->mode);
|
|
|
|
switch (typefind->mode) {
|
|
case MODE_TYPEFIND:
|
|
switch (GST_EVENT_TYPE (event)) {
|
|
case GST_EVENT_EOS:{
|
|
GstTypeFindProbability prob = 0;
|
|
GstCaps *caps = NULL;
|
|
|
|
GST_INFO_OBJECT (typefind, "Got EOS and no type found yet");
|
|
|
|
/* we might not have started typefinding yet because there was not
|
|
* enough data so far; just give it a shot now and see what we get */
|
|
if (typefind->store) {
|
|
caps = gst_type_find_helper_for_buffer (GST_OBJECT (typefind),
|
|
typefind->store, &prob);
|
|
|
|
if (caps && prob >= typefind->min_probability) {
|
|
g_signal_emit (typefind, gst_type_find_element_signals[HAVE_TYPE],
|
|
0, prob, caps);
|
|
} else {
|
|
GST_ELEMENT_ERROR (typefind, STREAM, TYPE_NOT_FOUND,
|
|
(NULL), (NULL));
|
|
}
|
|
gst_caps_replace (&caps, NULL);
|
|
} else {
|
|
/* keep message in sync with the one in the pad activate function */
|
|
GST_ELEMENT_ERROR (typefind, STREAM, TYPE_NOT_FOUND,
|
|
(_("Stream contains no data.")),
|
|
("Can't typefind empty stream"));
|
|
}
|
|
|
|
stop_typefinding (typefind);
|
|
res = gst_pad_push_event (typefind->src, event);
|
|
break;
|
|
}
|
|
case GST_EVENT_FLUSH_STOP:
|
|
g_list_foreach (typefind->cached_events,
|
|
(GFunc) gst_mini_object_unref, NULL);
|
|
g_list_free (typefind->cached_events);
|
|
typefind->cached_events = NULL;
|
|
gst_buffer_replace (&typefind->store, NULL);
|
|
/* fall through */
|
|
case GST_EVENT_FLUSH_START:
|
|
res = gst_pad_push_event (typefind->src, event);
|
|
break;
|
|
default:
|
|
GST_DEBUG_OBJECT (typefind, "Saving %s event to send later",
|
|
GST_EVENT_TYPE_NAME (event));
|
|
typefind->cached_events =
|
|
g_list_append (typefind->cached_events, event);
|
|
res = TRUE;
|
|
break;
|
|
}
|
|
break;
|
|
case MODE_NORMAL:
|
|
res = gst_pad_push_event (typefind->src, event);
|
|
break;
|
|
case MODE_ERROR:
|
|
break;
|
|
default:
|
|
g_assert_not_reached ();
|
|
}
|
|
return res;
|
|
}
|
|
|
|
static void
|
|
gst_type_find_element_send_cached_events (GstTypeFindElement * typefind)
|
|
{
|
|
GList *l;
|
|
|
|
for (l = typefind->cached_events; l != NULL; l = l->next) {
|
|
GstEvent *event = GST_EVENT (l->data);
|
|
|
|
GST_DEBUG_OBJECT (typefind, "sending cached %s event",
|
|
GST_EVENT_TYPE_NAME (event));
|
|
gst_pad_push_event (typefind->src, event);
|
|
}
|
|
g_list_free (typefind->cached_events);
|
|
typefind->cached_events = NULL;
|
|
}
|
|
|
|
static gboolean
|
|
gst_type_find_element_setcaps (GstPad * pad, GstCaps * caps)
|
|
{
|
|
GstTypeFindElement *typefind;
|
|
|
|
typefind = GST_TYPE_FIND_ELEMENT (GST_PAD_PARENT (pad));
|
|
|
|
/* don't operate on ANY caps */
|
|
if (gst_caps_is_any (caps))
|
|
return TRUE;
|
|
|
|
g_signal_emit (typefind, gst_type_find_element_signals[HAVE_TYPE], 0,
|
|
GST_TYPE_FIND_MAXIMUM, caps);
|
|
|
|
/* Shortcircuit typefinding if we get caps */
|
|
if (typefind->mode == MODE_TYPEFIND) {
|
|
GST_DEBUG_OBJECT (typefind, "Skipping typefinding, using caps from "
|
|
"upstream buffer: %" GST_PTR_FORMAT, caps);
|
|
typefind->mode = MODE_NORMAL;
|
|
|
|
gst_type_find_element_send_cached_events (typefind);
|
|
if (typefind->store) {
|
|
GST_DEBUG_OBJECT (typefind, "Pushing store: %d",
|
|
GST_BUFFER_SIZE (typefind->store));
|
|
gst_buffer_set_caps (typefind->store, typefind->caps);
|
|
gst_pad_push (typefind->src, typefind->store);
|
|
typefind->store = NULL;
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static GstCaps *
|
|
gst_type_find_guess_by_extension (GstTypeFindElement * typefind, GstPad * pad,
|
|
GstTypeFindProbability * probability)
|
|
{
|
|
GstQuery *query;
|
|
gchar *uri;
|
|
size_t len;
|
|
gint find;
|
|
GstCaps *caps;
|
|
|
|
query = gst_query_new_uri ();
|
|
|
|
/* try getting the caps with an uri query and from the extension */
|
|
if (!gst_pad_peer_query (pad, query))
|
|
goto peer_query_failed;
|
|
|
|
gst_query_parse_uri (query, &uri);
|
|
if (uri == NULL)
|
|
goto no_uri;
|
|
|
|
GST_DEBUG_OBJECT (typefind, "finding extension of %s", uri);
|
|
|
|
/* find the extension on the uri, this is everything after a '.' */
|
|
len = strlen (uri);
|
|
find = len - 1;
|
|
|
|
while (find >= 0) {
|
|
if (uri[find] == '.')
|
|
break;
|
|
find--;
|
|
}
|
|
if (find < 0)
|
|
goto no_extension;
|
|
|
|
GST_DEBUG_OBJECT (typefind, "found extension %s", &uri[find + 1]);
|
|
|
|
caps =
|
|
gst_type_find_helper_for_extension (GST_OBJECT_CAST (typefind),
|
|
&uri[find + 1]);
|
|
if (caps)
|
|
*probability = GST_TYPE_FIND_MAXIMUM;
|
|
|
|
gst_query_unref (query);
|
|
|
|
return caps;
|
|
|
|
/* ERRORS */
|
|
peer_query_failed:
|
|
{
|
|
GST_WARNING_OBJECT (typefind, "failed to query peer uri");
|
|
gst_query_unref (query);
|
|
return NULL;
|
|
}
|
|
no_uri:
|
|
{
|
|
GST_WARNING_OBJECT (typefind, "could not parse the peer uri");
|
|
gst_query_unref (query);
|
|
return NULL;
|
|
}
|
|
no_extension:
|
|
{
|
|
GST_WARNING_OBJECT (typefind, "could not find uri extension in %s", uri);
|
|
gst_query_unref (query);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_type_find_element_chain (GstPad * pad, GstBuffer * buffer)
|
|
{
|
|
GstTypeFindElement *typefind;
|
|
GstFlowReturn res = GST_FLOW_OK;
|
|
|
|
typefind = GST_TYPE_FIND_ELEMENT (GST_PAD_PARENT (pad));
|
|
|
|
switch (typefind->mode) {
|
|
case MODE_ERROR:
|
|
/* we should already have called GST_ELEMENT_ERROR */
|
|
return GST_FLOW_ERROR;
|
|
case MODE_NORMAL:
|
|
gst_buffer_set_caps (buffer, typefind->caps);
|
|
return gst_pad_push (typefind->src, buffer);
|
|
case MODE_TYPEFIND:{
|
|
if (typefind->store)
|
|
typefind->store = gst_buffer_join (typefind->store, buffer);
|
|
else
|
|
typefind->store = buffer;
|
|
|
|
res = gst_type_find_element_chain_do_typefinding (typefind);
|
|
|
|
if (typefind->mode == MODE_ERROR)
|
|
res = GST_FLOW_ERROR;
|
|
|
|
break;
|
|
}
|
|
default:
|
|
g_assert_not_reached ();
|
|
return GST_FLOW_ERROR;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_type_find_element_chain_do_typefinding (GstTypeFindElement * typefind)
|
|
{
|
|
GstTypeFindProbability probability;
|
|
GstCaps *caps;
|
|
|
|
if (GST_BUFFER_SIZE (typefind->store) < TYPE_FIND_MIN_SIZE) {
|
|
GST_DEBUG_OBJECT (typefind, "not enough data for typefinding yet "
|
|
"(%u bytes)", GST_BUFFER_SIZE (typefind->store));
|
|
return GST_FLOW_OK;
|
|
}
|
|
|
|
caps = gst_type_find_helper_for_buffer (GST_OBJECT (typefind),
|
|
typefind->store, &probability);
|
|
|
|
if (caps == NULL && GST_BUFFER_SIZE (typefind->store) > TYPE_FIND_MAX_SIZE) {
|
|
GST_ELEMENT_ERROR (typefind, STREAM, TYPE_NOT_FOUND, (NULL), (NULL));
|
|
stop_typefinding (typefind);
|
|
return GST_FLOW_ERROR;
|
|
} else if (caps == NULL) {
|
|
GST_DEBUG_OBJECT (typefind, "no caps found with %u bytes of data, "
|
|
"waiting for more data", GST_BUFFER_SIZE (typefind->store));
|
|
return GST_FLOW_OK;
|
|
}
|
|
|
|
/* found a type */
|
|
if (probability < typefind->min_probability) {
|
|
GST_DEBUG_OBJECT (typefind, "found caps %" GST_PTR_FORMAT ", but "
|
|
"probability is %u which is lower than the required minimum of %u",
|
|
caps, probability, typefind->min_probability);
|
|
|
|
gst_caps_replace (&caps, NULL);
|
|
|
|
if (GST_BUFFER_SIZE (typefind->store) >= TYPE_FIND_MAX_SIZE) {
|
|
GST_ELEMENT_ERROR (typefind, STREAM, TYPE_NOT_FOUND, (NULL), (NULL));
|
|
stop_typefinding (typefind);
|
|
return GST_FLOW_ERROR;
|
|
}
|
|
|
|
GST_DEBUG_OBJECT (typefind, "waiting for more data to try again");
|
|
return GST_FLOW_OK;
|
|
}
|
|
|
|
/* probability is good enough too, so let's make it known ... */
|
|
g_signal_emit (typefind, gst_type_find_element_signals[HAVE_TYPE], 0,
|
|
probability, caps);
|
|
|
|
/* .. and send out the accumulated data */
|
|
stop_typefinding (typefind);
|
|
gst_caps_unref (caps);
|
|
return GST_FLOW_OK;
|
|
}
|
|
|
|
static gboolean
|
|
gst_type_find_element_checkgetrange (GstPad * srcpad)
|
|
{
|
|
GstTypeFindElement *typefind;
|
|
|
|
typefind = GST_TYPE_FIND_ELEMENT (GST_PAD_PARENT (srcpad));
|
|
|
|
return gst_pad_check_pull_range (typefind->sink);
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_type_find_element_getrange (GstPad * srcpad,
|
|
guint64 offset, guint length, GstBuffer ** buffer)
|
|
{
|
|
GstTypeFindElement *typefind;
|
|
GstFlowReturn ret;
|
|
|
|
typefind = GST_TYPE_FIND_ELEMENT (GST_PAD_PARENT (srcpad));
|
|
|
|
ret = gst_pad_pull_range (typefind->sink, offset, length, buffer);
|
|
|
|
if (ret == GST_FLOW_OK && buffer && *buffer)
|
|
gst_buffer_set_caps (*buffer, typefind->caps);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static gboolean
|
|
gst_type_find_element_activate_src_pull (GstPad * pad, gboolean active)
|
|
{
|
|
GstTypeFindElement *typefind;
|
|
|
|
typefind = GST_TYPE_FIND_ELEMENT (GST_OBJECT_PARENT (pad));
|
|
|
|
return gst_pad_activate_pull (typefind->sink, active);
|
|
}
|
|
|
|
static gboolean
|
|
gst_type_find_element_activate (GstPad * pad)
|
|
{
|
|
GstTypeFindProbability probability = 0;
|
|
GstCaps *found_caps = NULL;
|
|
GstTypeFindElement *typefind;
|
|
|
|
typefind = GST_TYPE_FIND_ELEMENT (GST_OBJECT_PARENT (pad));
|
|
|
|
/* if we have force caps, use those */
|
|
if (typefind->force_caps) {
|
|
found_caps = gst_caps_ref (typefind->force_caps);
|
|
probability = GST_TYPE_FIND_MAXIMUM;
|
|
goto done;
|
|
}
|
|
|
|
/* 1. try to activate in pull mode. if not, switch to push and succeed.
|
|
2. try to pull type find.
|
|
3. deactivate pull mode.
|
|
4. src pad might have been activated push by the state change. deactivate.
|
|
5. if we didn't find any caps, try getting the uri extension by doing an uri
|
|
query.
|
|
6. if we didn't find any caps, fail.
|
|
7. emit have-type; maybe the app connected the source pad to something.
|
|
8. if the sink pad is activated, we are in pull mode. succeed.
|
|
otherwise activate both pads in push mode and succeed.
|
|
*/
|
|
|
|
/* 1 */
|
|
if (!gst_pad_check_pull_range (pad) || !gst_pad_activate_pull (pad, TRUE)) {
|
|
start_typefinding (typefind);
|
|
return gst_pad_activate_push (pad, TRUE);
|
|
}
|
|
|
|
/* 2 */
|
|
{
|
|
GstPad *peer;
|
|
|
|
peer = gst_pad_get_peer (pad);
|
|
if (peer) {
|
|
gint64 size;
|
|
GstFormat format = GST_FORMAT_BYTES;
|
|
|
|
if (!gst_pad_query_duration (peer, &format, &size)) {
|
|
GST_WARNING_OBJECT (typefind, "Could not query upstream length!");
|
|
gst_object_unref (peer);
|
|
return FALSE;
|
|
}
|
|
|
|
/* the size if 0, we cannot continue */
|
|
if (size == 0) {
|
|
/* keep message in sync with message in sink event handler */
|
|
GST_ELEMENT_ERROR (typefind, STREAM, TYPE_NOT_FOUND,
|
|
(_("Stream contains no data.")), ("Can't typefind empty stream"));
|
|
gst_object_unref (peer);
|
|
return FALSE;
|
|
}
|
|
|
|
found_caps = gst_type_find_helper_get_range (GST_OBJECT_CAST (peer),
|
|
(GstTypeFindHelperGetRangeFunction) (GST_PAD_GETRANGEFUNC (peer)),
|
|
(guint64) size, &probability);
|
|
|
|
gst_object_unref (peer);
|
|
}
|
|
}
|
|
|
|
/* 3 */
|
|
gst_pad_activate_pull (pad, FALSE);
|
|
|
|
/* 4 */
|
|
gst_pad_activate_push (typefind->src, FALSE);
|
|
|
|
/* 5 */
|
|
if (!found_caps || probability < typefind->min_probability) {
|
|
found_caps = gst_type_find_guess_by_extension (typefind, pad, &probability);
|
|
}
|
|
|
|
/* 6 */
|
|
if (!found_caps || probability < typefind->min_probability) {
|
|
GST_ELEMENT_ERROR (typefind, STREAM, TYPE_NOT_FOUND, (NULL), (NULL));
|
|
gst_caps_replace (&found_caps, NULL);
|
|
return FALSE;
|
|
}
|
|
|
|
done:
|
|
/* 7 */
|
|
g_signal_emit (typefind, gst_type_find_element_signals[HAVE_TYPE],
|
|
0, probability, found_caps);
|
|
gst_caps_unref (found_caps);
|
|
typefind->mode = MODE_NORMAL;
|
|
|
|
/* 8 */
|
|
if (gst_pad_is_active (pad))
|
|
return TRUE;
|
|
else {
|
|
gboolean ret;
|
|
|
|
ret = gst_pad_activate_push (typefind->src, TRUE);
|
|
ret &= gst_pad_activate_push (pad, TRUE);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
static GstStateChangeReturn
|
|
gst_type_find_element_change_state (GstElement * element,
|
|
GstStateChange transition)
|
|
{
|
|
GstStateChangeReturn ret;
|
|
GstTypeFindElement *typefind;
|
|
|
|
typefind = GST_TYPE_FIND_ELEMENT (element);
|
|
|
|
|
|
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
|
|
|
|
switch (transition) {
|
|
case GST_STATE_CHANGE_PAUSED_TO_READY:
|
|
case GST_STATE_CHANGE_READY_TO_NULL:
|
|
gst_caps_replace (&typefind->caps, NULL);
|
|
|
|
g_list_foreach (typefind->cached_events,
|
|
(GFunc) gst_mini_object_unref, NULL);
|
|
g_list_free (typefind->cached_events);
|
|
typefind->cached_events = NULL;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|