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1263 lines
37 KiB
C
1263 lines
37 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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, 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. Once the type has been detected it sets its src pad caps
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* to the found media type.
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*
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* Whenever a type is found the #GstTypeFindElement::have-type signal is
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* emitted, either from the streaming thread or the application thread
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* (the latter may happen when typefinding is done pull-based from the
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* state change function).
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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 (never implemented))
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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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* By default it tries to do pull based typefinding (this avoids joining
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* received buffers and holding them back in store.)
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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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* Most of the actual implementation is in libs/gst/base/gsttypefindhelper.c.
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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 "gst/gst_private.h"
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#include "gsttypefindelement.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_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 \
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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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#define gst_type_find_element_parent_class parent_class
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G_DEFINE_TYPE_WITH_CODE (GstTypeFindElement, gst_type_find_element,
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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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static gboolean gst_type_find_element_src_event (GstPad * pad,
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GstObject * parent, GstEvent * event);
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static gboolean gst_type_find_handle_src_query (GstPad * pad,
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GstObject * parent, GstQuery * query);
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static gboolean gst_type_find_element_sink_event (GstPad * pad,
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GstObject * parent, GstEvent * event);
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static gboolean gst_type_find_element_setcaps (GstTypeFindElement * typefind,
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GstCaps * caps);
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static GstFlowReturn gst_type_find_element_chain (GstPad * sinkpad,
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GstObject * parent, GstBuffer * buffer);
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static GstFlowReturn gst_type_find_element_getrange (GstPad * srcpad,
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GstObject * parent, guint64 offset, guint length, GstBuffer ** buffer);
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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_sink (GstPad * pad,
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GstObject * parent);
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static gboolean gst_type_find_element_activate_sink_mode (GstPad * pad,
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GstObject * parent, GstPadMode mode, gboolean active);
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static gboolean gst_type_find_element_activate_src_mode (GstPad * pad,
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GstObject * parent, GstPadMode mode, 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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gboolean check_avail);
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static void gst_type_find_element_send_cached_events (GstTypeFindElement *
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typefind);
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static void gst_type_find_element_loop (GstPad * pad);
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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, 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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GST_OBJECT_LOCK (typefind);
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if (typefind->caps)
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gst_caps_unref (typefind->caps);
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typefind->caps = gst_caps_ref (caps);
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GST_OBJECT_UNLOCK (typefind);
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gst_pad_set_caps (typefind->src, caps);
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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_TYPE_CAPS,
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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_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_TYPE_CAPS,
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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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g_cclosure_marshal_generic, 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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gst_element_class_set_static_metadata (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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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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{
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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_sink));
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gst_pad_set_activatemode_function (typefind->sink,
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GST_DEBUG_FUNCPTR (gst_type_find_element_activate_sink_mode));
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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_sink_event));
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GST_PAD_SET_PROXY_ALLOCATION (typefind->sink);
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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_activatemode_function (typefind->src,
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GST_DEBUG_FUNCPTR (gst_type_find_element_activate_src_mode));
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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->adapter = gst_adapter_new ();
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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->adapter) {
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g_object_unref (typefind->adapter);
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typefind->adapter = 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_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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GST_OBJECT_LOCK (typefind);
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g_value_set_boxed (value, typefind->caps);
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GST_OBJECT_UNLOCK (typefind);
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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_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, GstObject * parent,
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GstQuery * query)
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{
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GstTypeFindElement *typefind;
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gboolean res = FALSE;
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typefind = GST_TYPE_FIND_ELEMENT (parent);
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GST_DEBUG_OBJECT (typefind, "Handling src query %s",
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GST_QUERY_TYPE_NAME (query));
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switch (GST_QUERY_TYPE (query)) {
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case GST_QUERY_SCHEDULING:
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/* FIXME, filter out the scheduling modes that we understand */
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res = gst_pad_peer_query (typefind->sink, query);
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break;
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case GST_QUERY_CAPS:
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{
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GST_DEBUG_OBJECT (typefind,
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"Got caps query, our caps are %" GST_PTR_FORMAT, typefind->caps);
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/* We can hijack caps query if we typefind already */
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if (typefind->caps) {
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gst_query_set_caps_result (query, typefind->caps);
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res = TRUE;
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} else {
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res = gst_pad_peer_query (typefind->sink, query);
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}
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break;
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}
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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 (!(res = gst_pad_peer_query (typefind->sink, query)))
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goto out;
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gst_query_parse_position (query, &format, &peer_pos);
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GST_OBJECT_LOCK (typefind);
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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_adapter_available (typefind->adapter);
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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_OBJECT_UNLOCK (typefind);
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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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res = gst_pad_query_default (pad, parent, query);
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break;
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}
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out:
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return res;
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}
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static gboolean
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gst_type_find_element_seek (GstTypeFindElement * typefind, GstEvent * event)
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{
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GstSeekFlags flags;
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GstSeekType start_type, stop_type;
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GstFormat format;
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gboolean flush;
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gdouble rate;
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gint64 start, stop;
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GstSegment seeksegment = { 0, };
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gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start,
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&stop_type, &stop);
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/* we can only seek on bytes */
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if (format != GST_FORMAT_BYTES) {
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GST_DEBUG_OBJECT (typefind, "Can only seek on BYTES");
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return FALSE;
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}
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/* copy segment, we need this because we still need the old
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* segment when we close the current segment. */
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memcpy (&seeksegment, &typefind->segment, sizeof (GstSegment));
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GST_DEBUG_OBJECT (typefind, "configuring seek");
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gst_segment_do_seek (&seeksegment, rate, format, flags,
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start_type, start, stop_type, stop, NULL);
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flush = ! !(flags & GST_SEEK_FLAG_FLUSH);
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GST_DEBUG_OBJECT (typefind, "New segment %" GST_SEGMENT_FORMAT, &seeksegment);
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if (flush) {
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GST_DEBUG_OBJECT (typefind, "Starting flush");
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gst_pad_push_event (typefind->sink, gst_event_new_flush_start ());
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gst_pad_push_event (typefind->src, gst_event_new_flush_start ());
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} else {
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GST_DEBUG_OBJECT (typefind, "Non-flushing seek, pausing task");
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gst_pad_pause_task (typefind->sink);
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}
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|
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/* now grab the stream lock so that streaming cannot continue, for
|
|
* non flushing seeks when the element is in PAUSED this could block
|
|
* forever. */
|
|
GST_DEBUG_OBJECT (typefind, "Waiting for streaming to stop");
|
|
GST_PAD_STREAM_LOCK (typefind->sink);
|
|
|
|
if (flush) {
|
|
GST_DEBUG_OBJECT (typefind, "Stopping flush");
|
|
gst_pad_push_event (typefind->sink, gst_event_new_flush_stop (TRUE));
|
|
gst_pad_push_event (typefind->src, gst_event_new_flush_stop (TRUE));
|
|
}
|
|
|
|
/* now update the real segment info */
|
|
GST_DEBUG_OBJECT (typefind, "Committing new seek segment");
|
|
memcpy (&typefind->segment, &seeksegment, sizeof (GstSegment));
|
|
typefind->offset = typefind->segment.start;
|
|
|
|
/* notify start of new segment */
|
|
if (typefind->segment.flags & GST_SEGMENT_FLAG_SEGMENT) {
|
|
GstMessage *msg;
|
|
|
|
msg = gst_message_new_segment_start (GST_OBJECT (typefind),
|
|
GST_FORMAT_BYTES, typefind->segment.start);
|
|
gst_element_post_message (GST_ELEMENT (typefind), msg);
|
|
}
|
|
|
|
typefind->need_segment = TRUE;
|
|
|
|
/* restart our task since it might have been stopped when we did the
|
|
* flush. */
|
|
gst_pad_start_task (typefind->sink,
|
|
(GstTaskFunction) gst_type_find_element_loop, typefind->sink, NULL);
|
|
|
|
/* streaming can continue now */
|
|
GST_PAD_STREAM_UNLOCK (typefind->sink);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
gst_type_find_element_src_event (GstPad * pad, GstObject * parent,
|
|
GstEvent * event)
|
|
{
|
|
GstTypeFindElement *typefind = GST_TYPE_FIND_ELEMENT (parent);
|
|
|
|
if (typefind->mode != MODE_NORMAL) {
|
|
/* need to do more? */
|
|
gst_mini_object_unref (GST_MINI_OBJECT_CAST (event));
|
|
return FALSE;
|
|
}
|
|
|
|
/* Only handle seeks here if driving the pipeline */
|
|
if (typefind->segment.format != GST_FORMAT_UNDEFINED &&
|
|
GST_EVENT_TYPE (event) == GST_EVENT_SEEK) {
|
|
return gst_type_find_element_seek (typefind, event);
|
|
} else {
|
|
return gst_pad_push_event (typefind->sink, event);
|
|
}
|
|
}
|
|
|
|
static void
|
|
start_typefinding (GstTypeFindElement * typefind)
|
|
{
|
|
GST_DEBUG_OBJECT (typefind, "starting typefinding");
|
|
|
|
GST_OBJECT_LOCK (typefind);
|
|
if (typefind->caps)
|
|
gst_caps_replace (&typefind->caps, NULL);
|
|
GST_OBJECT_UNLOCK (typefind);
|
|
|
|
typefind->mode = MODE_TYPEFIND;
|
|
}
|
|
|
|
static void
|
|
stop_typefinding (GstTypeFindElement * typefind)
|
|
{
|
|
GstState state;
|
|
gboolean push_cached_buffers;
|
|
gsize avail;
|
|
GstBuffer *buffer;
|
|
GstClockTime pts, dts;
|
|
|
|
gst_element_get_state (GST_ELEMENT (typefind), &state, NULL, 0);
|
|
|
|
push_cached_buffers = (state >= GST_STATE_PAUSED && typefind->caps);
|
|
|
|
GST_DEBUG_OBJECT (typefind, "stopping typefinding%s",
|
|
push_cached_buffers ? " and pushing cached events and buffers" : "");
|
|
|
|
typefind->mode = MODE_NORMAL;
|
|
if (push_cached_buffers)
|
|
gst_type_find_element_send_cached_events (typefind);
|
|
|
|
GST_OBJECT_LOCK (typefind);
|
|
avail = gst_adapter_available (typefind->adapter);
|
|
if (avail == 0)
|
|
goto no_data;
|
|
|
|
pts = gst_adapter_prev_pts (typefind->adapter, NULL);
|
|
dts = gst_adapter_prev_dts (typefind->adapter, NULL);
|
|
buffer = gst_adapter_take_buffer (typefind->adapter, avail);
|
|
GST_BUFFER_PTS (buffer) = pts;
|
|
GST_BUFFER_DTS (buffer) = dts;
|
|
GST_OBJECT_UNLOCK (typefind);
|
|
|
|
if (!push_cached_buffers) {
|
|
gst_buffer_unref (buffer);
|
|
} else {
|
|
GstPad *peer = gst_pad_get_peer (typefind->src);
|
|
|
|
/* 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 */
|
|
gst_buffer_unref (buffer);
|
|
} else {
|
|
gst_pad_push (typefind->src, buffer);
|
|
}
|
|
if (peer)
|
|
gst_object_unref (peer);
|
|
}
|
|
return;
|
|
|
|
/* ERRORS */
|
|
no_data:
|
|
{
|
|
GST_DEBUG_OBJECT (typefind, "we have no data to typefind");
|
|
GST_OBJECT_UNLOCK (typefind);
|
|
return;
|
|
}
|
|
}
|
|
|
|
static gboolean
|
|
gst_type_find_element_sink_event (GstPad * pad, GstObject * parent,
|
|
GstEvent * event)
|
|
{
|
|
gboolean res = FALSE;
|
|
GstTypeFindElement *typefind = GST_TYPE_FIND_ELEMENT (parent);
|
|
|
|
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_CAPS:
|
|
{
|
|
GstCaps *caps;
|
|
|
|
/* Parse and push out our caps and data */
|
|
gst_event_parse_caps (event, &caps);
|
|
res = gst_type_find_element_setcaps (typefind, caps);
|
|
|
|
gst_event_unref (event);
|
|
break;
|
|
}
|
|
case GST_EVENT_GAP:
|
|
{
|
|
GST_FIXME_OBJECT (typefind,
|
|
"GAP events during typefinding not handled properly");
|
|
|
|
/* FIXME: These would need to be inserted in the stream at
|
|
* the right position between buffers, but we combine all
|
|
* buffers with a GstAdapter. Drop the GAP event for now,
|
|
* which will only cause an implicit GAP between buffers.
|
|
*/
|
|
gst_event_unref (event);
|
|
res = TRUE;
|
|
break;
|
|
}
|
|
case GST_EVENT_EOS:
|
|
{
|
|
GST_INFO_OBJECT (typefind, "Got EOS and no type found yet");
|
|
gst_type_find_element_chain_do_typefinding (typefind, FALSE);
|
|
|
|
res = gst_pad_push_event (typefind->src, event);
|
|
break;
|
|
}
|
|
case GST_EVENT_FLUSH_STOP:{
|
|
GList *l;
|
|
|
|
GST_OBJECT_LOCK (typefind);
|
|
|
|
for (l = typefind->cached_events; l; l = l->next) {
|
|
if (GST_EVENT_IS_STICKY (l->data) &&
|
|
GST_EVENT_TYPE (l->data) != GST_EVENT_SEGMENT &&
|
|
GST_EVENT_TYPE (l->data) != GST_EVENT_EOS) {
|
|
gst_pad_store_sticky_event (typefind->src, l->data);
|
|
}
|
|
gst_event_unref (l->data);
|
|
}
|
|
|
|
g_list_free (typefind->cached_events);
|
|
typefind->cached_events = NULL;
|
|
gst_adapter_clear (typefind->adapter);
|
|
GST_OBJECT_UNLOCK (typefind);
|
|
/* fall through */
|
|
}
|
|
case GST_EVENT_FLUSH_START:
|
|
res = gst_pad_push_event (typefind->src, event);
|
|
break;
|
|
default:
|
|
/* Forward events that would happen before the caps event
|
|
* directly instead of storing them. There's no reason not
|
|
* to send them directly and we should only store events
|
|
* for later sending that would need to come after the caps
|
|
* event */
|
|
if (GST_EVENT_TYPE (event) < GST_EVENT_CAPS) {
|
|
res = gst_pad_push_event (typefind->src, event);
|
|
} else {
|
|
GST_DEBUG_OBJECT (typefind, "Saving %s event to send later",
|
|
GST_EVENT_TYPE_NAME (event));
|
|
GST_OBJECT_LOCK (typefind);
|
|
typefind->cached_events =
|
|
g_list_append (typefind->cached_events, event);
|
|
GST_OBJECT_UNLOCK (typefind);
|
|
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, *cached_events;
|
|
|
|
GST_OBJECT_LOCK (typefind);
|
|
cached_events = typefind->cached_events;
|
|
typefind->cached_events = NULL;
|
|
GST_OBJECT_UNLOCK (typefind);
|
|
|
|
for (l = 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 (cached_events);
|
|
}
|
|
|
|
static gboolean
|
|
gst_type_find_element_setcaps (GstTypeFindElement * typefind, GstCaps * caps)
|
|
{
|
|
/* 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 */
|
|
GST_DEBUG_OBJECT (typefind, "Skipping typefinding, using caps from "
|
|
"upstream: %" GST_PTR_FORMAT, caps);
|
|
|
|
stop_typefinding (typefind);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static gchar *
|
|
gst_type_find_get_extension (GstTypeFindElement * typefind, GstPad * pad)
|
|
{
|
|
GstQuery *query;
|
|
gchar *uri, *result;
|
|
size_t len;
|
|
gint find;
|
|
|
|
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;
|
|
|
|
result = g_strdup (&uri[find + 1]);
|
|
|
|
GST_DEBUG_OBJECT (typefind, "found extension %s", result);
|
|
gst_query_unref (query);
|
|
g_free (uri);
|
|
|
|
return result;
|
|
|
|
/* 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);
|
|
g_free (uri);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
static GstCaps *
|
|
gst_type_find_guess_by_extension (GstTypeFindElement * typefind, GstPad * pad,
|
|
GstTypeFindProbability * probability)
|
|
{
|
|
gchar *ext;
|
|
GstCaps *caps;
|
|
|
|
ext = gst_type_find_get_extension (typefind, pad);
|
|
if (!ext)
|
|
return NULL;
|
|
|
|
caps = gst_type_find_helper_for_extension (GST_OBJECT_CAST (typefind), ext);
|
|
if (caps)
|
|
*probability = GST_TYPE_FIND_MAXIMUM;
|
|
|
|
g_free (ext);
|
|
|
|
return caps;
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_type_find_element_chain (GstPad * pad, GstObject * parent,
|
|
GstBuffer * buffer)
|
|
{
|
|
GstTypeFindElement *typefind;
|
|
GstFlowReturn res = GST_FLOW_OK;
|
|
|
|
typefind = GST_TYPE_FIND_ELEMENT (parent);
|
|
|
|
GST_LOG_OBJECT (typefind, "handling buffer in mode %d", typefind->mode);
|
|
|
|
switch (typefind->mode) {
|
|
case MODE_ERROR:
|
|
/* we should already have called GST_ELEMENT_ERROR */
|
|
return GST_FLOW_ERROR;
|
|
case MODE_NORMAL:
|
|
/* don't take object lock as typefind->caps should not change anymore */
|
|
return gst_pad_push (typefind->src, buffer);
|
|
case MODE_TYPEFIND:
|
|
{
|
|
GST_OBJECT_LOCK (typefind);
|
|
gst_adapter_push (typefind->adapter, buffer);
|
|
GST_OBJECT_UNLOCK (typefind);
|
|
|
|
res = gst_type_find_element_chain_do_typefinding (typefind, TRUE);
|
|
|
|
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,
|
|
gboolean check_avail)
|
|
{
|
|
GstTypeFindProbability probability;
|
|
GstCaps *caps = NULL;
|
|
gsize avail;
|
|
const guint8 *data;
|
|
gboolean have_min, have_max;
|
|
|
|
GST_OBJECT_LOCK (typefind);
|
|
if (typefind->force_caps) {
|
|
caps = gst_caps_ref (typefind->force_caps);
|
|
probability = GST_TYPE_FIND_MAXIMUM;
|
|
}
|
|
|
|
if (!caps) {
|
|
avail = gst_adapter_available (typefind->adapter);
|
|
|
|
if (check_avail) {
|
|
have_min = avail >= TYPE_FIND_MIN_SIZE;
|
|
have_max = avail >= TYPE_FIND_MAX_SIZE;
|
|
} else {
|
|
have_min = avail > 0;
|
|
have_max = TRUE;
|
|
}
|
|
|
|
if (!have_min)
|
|
goto not_enough_data;
|
|
|
|
/* map all available data */
|
|
data = gst_adapter_map (typefind->adapter, avail);
|
|
caps = gst_type_find_helper_for_data (GST_OBJECT (typefind),
|
|
data, avail, &probability);
|
|
gst_adapter_unmap (typefind->adapter);
|
|
|
|
if (caps == NULL && have_max)
|
|
goto no_type_found;
|
|
else if (caps == NULL)
|
|
goto wait_for_data;
|
|
|
|
/* found a type */
|
|
if (probability < typefind->min_probability)
|
|
goto low_probability;
|
|
}
|
|
|
|
GST_OBJECT_UNLOCK (typefind);
|
|
|
|
/* probability is good enough too, so let's make it known ... emiting this
|
|
* signal calls our object handler which sets the caps. */
|
|
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;
|
|
|
|
not_enough_data:
|
|
{
|
|
GST_DEBUG_OBJECT (typefind, "not enough data for typefinding yet "
|
|
"(%" G_GSIZE_FORMAT " bytes)", avail);
|
|
GST_OBJECT_UNLOCK (typefind);
|
|
return GST_FLOW_OK;
|
|
}
|
|
no_type_found:
|
|
{
|
|
GST_OBJECT_UNLOCK (typefind);
|
|
GST_ELEMENT_ERROR (typefind, STREAM, TYPE_NOT_FOUND, (NULL), (NULL));
|
|
stop_typefinding (typefind);
|
|
return GST_FLOW_ERROR;
|
|
}
|
|
wait_for_data:
|
|
{
|
|
GST_DEBUG_OBJECT (typefind,
|
|
"no caps found with %" G_GSIZE_FORMAT " bytes of data, "
|
|
"waiting for more data", avail);
|
|
GST_OBJECT_UNLOCK (typefind);
|
|
return GST_FLOW_OK;
|
|
}
|
|
low_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_unref (caps);
|
|
|
|
if (have_max)
|
|
goto no_type_found;
|
|
|
|
GST_OBJECT_UNLOCK (typefind);
|
|
GST_DEBUG_OBJECT (typefind, "waiting for more data to try again");
|
|
return GST_FLOW_OK;
|
|
}
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_type_find_element_getrange (GstPad * srcpad, GstObject * parent,
|
|
guint64 offset, guint length, GstBuffer ** buffer)
|
|
{
|
|
GstTypeFindElement *typefind;
|
|
GstFlowReturn ret;
|
|
|
|
typefind = GST_TYPE_FIND_ELEMENT (parent);
|
|
|
|
ret = gst_pad_pull_range (typefind->sink, offset, length, buffer);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static gboolean
|
|
gst_type_find_element_activate_src_mode (GstPad * pad, GstObject * parent,
|
|
GstPadMode mode, gboolean active)
|
|
{
|
|
gboolean res;
|
|
GstTypeFindElement *typefind;
|
|
|
|
typefind = GST_TYPE_FIND_ELEMENT (parent);
|
|
|
|
switch (mode) {
|
|
case GST_PAD_MODE_PULL:
|
|
/* make sure our task stops pushing, we can't call _stop here because this
|
|
* activation might happen from the streaming thread. */
|
|
gst_pad_pause_task (typefind->sink);
|
|
res = gst_pad_activate_mode (typefind->sink, mode, active);
|
|
break;
|
|
default:
|
|
res = TRUE;
|
|
break;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
static void
|
|
gst_type_find_element_loop (GstPad * pad)
|
|
{
|
|
GstTypeFindElement *typefind;
|
|
GstFlowReturn ret = GST_FLOW_OK;
|
|
|
|
typefind = GST_TYPE_FIND_ELEMENT (GST_PAD_PARENT (pad));
|
|
|
|
if (typefind->need_stream_start) {
|
|
gchar *stream_id;
|
|
GstEvent *event;
|
|
|
|
stream_id = gst_pad_create_stream_id (typefind->src,
|
|
GST_ELEMENT_CAST (typefind), NULL);
|
|
|
|
GST_DEBUG_OBJECT (typefind, "Pushing STREAM_START");
|
|
event = gst_event_new_stream_start (stream_id);
|
|
gst_event_set_group_id (event, gst_util_group_id_next ());
|
|
gst_pad_push_event (typefind->src, event);
|
|
|
|
typefind->need_stream_start = FALSE;
|
|
g_free (stream_id);
|
|
}
|
|
|
|
if (typefind->mode == MODE_TYPEFIND) {
|
|
GstPad *peer = NULL;
|
|
GstCaps *found_caps = NULL;
|
|
GstTypeFindProbability probability = GST_TYPE_FIND_NONE;
|
|
|
|
GST_DEBUG_OBJECT (typefind, "find type in pull mode");
|
|
|
|
GST_OBJECT_LOCK (typefind);
|
|
if (typefind->force_caps) {
|
|
found_caps = gst_caps_ref (typefind->force_caps);
|
|
probability = GST_TYPE_FIND_MAXIMUM;
|
|
}
|
|
GST_OBJECT_UNLOCK (typefind);
|
|
|
|
if (!found_caps) {
|
|
peer = gst_pad_get_peer (pad);
|
|
if (peer) {
|
|
gint64 size;
|
|
gchar *ext;
|
|
|
|
if (!gst_pad_query_duration (peer, GST_FORMAT_BYTES, &size)) {
|
|
GST_WARNING_OBJECT (typefind, "Could not query upstream length!");
|
|
gst_object_unref (peer);
|
|
|
|
ret = GST_FLOW_ERROR;
|
|
goto pause;
|
|
}
|
|
|
|
/* 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);
|
|
ret = GST_FLOW_ERROR;
|
|
goto pause;
|
|
}
|
|
ext = gst_type_find_get_extension (typefind, pad);
|
|
|
|
found_caps =
|
|
gst_type_find_helper_get_range (GST_OBJECT_CAST (peer),
|
|
GST_OBJECT_PARENT (peer),
|
|
(GstTypeFindHelperGetRangeFunction) (GST_PAD_GETRANGEFUNC (peer)),
|
|
(guint64) size, ext, &probability);
|
|
g_free (ext);
|
|
|
|
GST_DEBUG ("Found caps %" GST_PTR_FORMAT, found_caps);
|
|
|
|
gst_object_unref (peer);
|
|
}
|
|
}
|
|
|
|
if (!found_caps || probability < typefind->min_probability) {
|
|
GST_DEBUG ("Trying to guess using extension");
|
|
gst_caps_replace (&found_caps, NULL);
|
|
found_caps =
|
|
gst_type_find_guess_by_extension (typefind, pad, &probability);
|
|
}
|
|
|
|
if (!found_caps || probability < typefind->min_probability) {
|
|
GST_ELEMENT_ERROR (typefind, STREAM, TYPE_NOT_FOUND, (NULL), (NULL));
|
|
gst_caps_replace (&found_caps, NULL);
|
|
ret = GST_FLOW_ERROR;
|
|
goto pause;
|
|
}
|
|
|
|
GST_DEBUG ("Emiting found caps %" GST_PTR_FORMAT, found_caps);
|
|
g_signal_emit (typefind, gst_type_find_element_signals[HAVE_TYPE],
|
|
0, probability, found_caps);
|
|
typefind->mode = MODE_NORMAL;
|
|
gst_caps_unref (found_caps);
|
|
} else if (typefind->mode == MODE_NORMAL) {
|
|
GstBuffer *outbuf = NULL;
|
|
|
|
if (typefind->need_segment) {
|
|
typefind->need_segment = FALSE;
|
|
gst_pad_push_event (typefind->src,
|
|
gst_event_new_segment (&typefind->segment));
|
|
}
|
|
|
|
/* Pull 4k blocks and send downstream */
|
|
ret = gst_pad_pull_range (typefind->sink, typefind->offset, 4096, &outbuf);
|
|
if (ret != GST_FLOW_OK)
|
|
goto pause;
|
|
|
|
typefind->offset += gst_buffer_get_size (outbuf);
|
|
|
|
ret = gst_pad_push (typefind->src, outbuf);
|
|
if (ret != GST_FLOW_OK)
|
|
goto pause;
|
|
} else {
|
|
/* Error out */
|
|
ret = GST_FLOW_ERROR;
|
|
goto pause;
|
|
}
|
|
|
|
return;
|
|
|
|
pause:
|
|
{
|
|
const gchar *reason = gst_flow_get_name (ret);
|
|
gboolean push_eos = FALSE;
|
|
|
|
GST_LOG_OBJECT (typefind, "pausing task, reason %s", reason);
|
|
gst_pad_pause_task (typefind->sink);
|
|
|
|
if (ret == GST_FLOW_EOS) {
|
|
/* perform EOS logic */
|
|
|
|
if (typefind->segment.flags & GST_SEGMENT_FLAG_SEGMENT) {
|
|
gint64 stop;
|
|
|
|
/* for segment playback we need to post when (in stream time)
|
|
* we stopped, this is either stop (when set) or the duration. */
|
|
if ((stop = typefind->segment.stop) == -1)
|
|
stop = typefind->offset;
|
|
|
|
GST_LOG_OBJECT (typefind, "Sending segment done, at end of segment");
|
|
gst_element_post_message (GST_ELEMENT (typefind),
|
|
gst_message_new_segment_done (GST_OBJECT (typefind),
|
|
GST_FORMAT_BYTES, stop));
|
|
gst_pad_push_event (typefind->src,
|
|
gst_event_new_segment_done (GST_FORMAT_BYTES, stop));
|
|
} else {
|
|
push_eos = TRUE;
|
|
}
|
|
} else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
|
|
/* for fatal errors we post an error message */
|
|
GST_ELEMENT_ERROR (typefind, STREAM, FAILED, (NULL),
|
|
("stream stopped, reason %s", reason));
|
|
push_eos = TRUE;
|
|
}
|
|
if (push_eos) {
|
|
/* send EOS, and prevent hanging if no streams yet */
|
|
GST_LOG_OBJECT (typefind, "Sending EOS, at end of stream");
|
|
gst_pad_push_event (typefind->src, gst_event_new_eos ());
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
|
|
static gboolean
|
|
gst_type_find_element_activate_sink_mode (GstPad * pad, GstObject * parent,
|
|
GstPadMode mode, gboolean active)
|
|
{
|
|
gboolean res;
|
|
GstTypeFindElement *typefind;
|
|
|
|
typefind = GST_TYPE_FIND_ELEMENT (parent);
|
|
|
|
switch (mode) {
|
|
case GST_PAD_MODE_PULL:
|
|
if (active) {
|
|
gst_segment_init (&typefind->segment, GST_FORMAT_BYTES);
|
|
typefind->need_segment = TRUE;
|
|
typefind->need_stream_start = TRUE;
|
|
typefind->offset = 0;
|
|
res = TRUE;
|
|
} else {
|
|
res = gst_pad_stop_task (pad);
|
|
}
|
|
break;
|
|
case GST_PAD_MODE_PUSH:
|
|
if (active)
|
|
start_typefinding (typefind);
|
|
else
|
|
stop_typefinding (typefind);
|
|
|
|
res = TRUE;
|
|
break;
|
|
default:
|
|
res = FALSE;
|
|
break;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
static gboolean
|
|
gst_type_find_element_activate_sink (GstPad * pad, GstObject * parent)
|
|
{
|
|
GstQuery *query;
|
|
gboolean pull_mode;
|
|
GstSchedulingFlags sched_flags;
|
|
|
|
query = gst_query_new_scheduling ();
|
|
|
|
if (!gst_pad_peer_query (pad, query)) {
|
|
gst_query_unref (query);
|
|
goto typefind_push;
|
|
}
|
|
|
|
gst_query_parse_scheduling (query, &sched_flags, NULL, NULL, NULL);
|
|
|
|
pull_mode = gst_query_has_scheduling_mode (query, GST_PAD_MODE_PULL)
|
|
&& ((sched_flags & GST_SCHEDULING_FLAG_SEEKABLE) != 0);
|
|
|
|
gst_query_unref (query);
|
|
|
|
if (!pull_mode)
|
|
goto typefind_push;
|
|
|
|
if (!gst_pad_activate_mode (pad, GST_PAD_MODE_PULL, TRUE))
|
|
goto typefind_push;
|
|
|
|
/* only start our task if we ourselves decide to start in pull mode */
|
|
return gst_pad_start_task (pad, (GstTaskFunction) gst_type_find_element_loop,
|
|
pad, NULL);
|
|
|
|
typefind_push:
|
|
{
|
|
return gst_pad_activate_mode (pad, GST_PAD_MODE_PUSH, TRUE);
|
|
}
|
|
}
|
|
|
|
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_OBJECT_LOCK (typefind);
|
|
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;
|
|
typefind->mode = MODE_TYPEFIND;
|
|
GST_OBJECT_UNLOCK (typefind);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|