/* GStreamer * Copyright (C) <2006> Edward Hervey * Copyright (C) <2009> Sebastian Dröge * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /** * SECTION:element-decodebin2 * * #GstBin that auto-magically constructs a decoding pipeline using available * decoders and demuxers via auto-plugging. * * At this stage, decodebin2 is considered UNSTABLE. The API provided in the * signals is expected to change in the near future. * * To try out decodebin2, you can set the USE_DECODEBIN2 environment * variable (USE_DECODEBIN2=1 for example). This will cause playbin to use * decodebin2 instead of the older #GstDecodeBin for its internal auto-plugging. */ /* Implementation notes: * * The following section describes how decodebin2 works internally. * * The first part of decodebin2 is it's typefind element, which tries * to get the type of the input stream. If the type is found autoplugging starts. * * decodebin2 internally organizes the elements it autoplugged into GstDecodeChains * and GstDecodeGroups. A decode chain is a single chain of decoding, this * means that if decodebin2 every autoplugs an element with two+ srcpads * (e.g. a demuxer) this will end the chain and everything following this * demuxer will be put into decode groups below the chain. Otherwise, * if an element has a single srcpad that outputs raw data the decode chain * is ended too and a GstDecodePad is stored and blocked. * * A decode group combines a number of chains that are created by a * demuxer element. All those chains are connected through a multiqueue to * the demuxer. A new group for the same demuxer is only created if the * demuxer has signaled no-more pads, in which case all following pads * create a new chain in the new group. * * This continues until the top-level decode chain is complete. A decode * chain is complete if it either ends with a blocked endpad, if autoplugging * stopped because no suitable plugins could be found or if the active group * is complete. A decode group OTOH is complete if all child chains are complete. * * If this happens at some point, all endpads of all active groups are exposed. * For this decodebin2 adds the endpads, signals no-more-pads and then unblocks * them. Now playback starts. * * If one of the chains that end on a endpad receives EOS decodebin2 checks upwards * via the parent pointers if all chains and groups are drained. In that case * everything goes into EOS. * If there is a chain where the active group is drained but there exist next groups * the active group is hidden (endpads are removed) and the next group is exposed. * * Note 1: If we're talking about blocked endpads this really means that the * *target* pads of the endpads are blocked. Pads that are exposed to the outside * should never ever be blocked! * * Note 2: If a group is complete and the parent's chain demuxer adds new pads * but never signaled no-more-pads this additional pads will be ignored! * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include #include "gstplay-marshal.h" #include "gstplay-enum.h" #include "gstfactorylists.h" /* generic templates */ static GstStaticPadTemplate decoder_bin_sink_template = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS_ANY); static GstStaticPadTemplate decoder_bin_src_template = GST_STATIC_PAD_TEMPLATE ("src%d", GST_PAD_SRC, GST_PAD_SOMETIMES, GST_STATIC_CAPS_ANY); GST_DEBUG_CATEGORY_STATIC (gst_decode_bin_debug); #define GST_CAT_DEFAULT gst_decode_bin_debug typedef struct _GstDecodeChain GstDecodeChain; typedef struct _GstDecodeGroup GstDecodeGroup; typedef struct _GstDecodePad GstDecodePad; typedef GstGhostPadClass GstDecodePadClass; typedef struct _GstDecodeBin GstDecodeBin; typedef struct _GstDecodeBin GstDecodeBin2; typedef struct _GstDecodeBinClass GstDecodeBinClass; #define GST_TYPE_DECODE_BIN (gst_decode_bin_get_type()) #define GST_DECODE_BIN_CAST(obj) ((GstDecodeBin*)(obj)) #define GST_DECODE_BIN(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_DECODE_BIN,GstDecodeBin)) #define GST_DECODE_BIN_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_DECODE_BIN,GstDecodeBinClass)) #define GST_IS_DECODE_BIN(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_DECODE_BIN)) #define GST_IS_DECODE_BIN_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_DECODE_BIN)) /** * GstDecodeBin2: * * The opaque #DecodeBin2 data structure */ struct _GstDecodeBin { GstBin bin; /* we extend GstBin */ /* properties */ GstCaps *caps; /* caps on which to stop decoding */ gchar *encoding; /* encoding of subtitles */ GstElement *typefind; /* this holds the typefind object */ GMutex *expose_lock; /* Protects exposal and removal of groups */ GstDecodeChain *decode_chain; /* Top level decode chain */ gint nbpads; /* unique identifier for source pads */ GValueArray *factories; /* factories we can use for selecting elements */ GList *subtitles; /* List of elements with subtitle-encoding, * protected by object lock! */ gboolean have_type; /* if we received the have_type signal */ guint have_type_id; /* signal id for have-type from typefind */ gboolean async_pending; /* async-start has been emited */ GMutex *dyn_lock; /* lock protecting pad blocking */ gboolean shutdown; /* if we are shutting down */ GList *blocked_pads; /* pads that have set to block */ }; struct _GstDecodeBinClass { GstBinClass parent_class; /* signal we fire when a new pad has been decoded into raw audio/video */ void (*new_decoded_pad) (GstElement * element, GstPad * pad, gboolean last); /* signal we fire when a pad has been removed */ void (*removed_decoded_pad) (GstElement * element, GstPad * pad); /* signal fired when we found a pad that we cannot decode */ void (*unknown_type) (GstElement * element, GstPad * pad, GstCaps * caps); /* signal fired to know if we continue trying to decode the given caps */ gboolean (*autoplug_continue) (GstElement * element, GstPad * pad, GstCaps * caps); /* signal fired to get a list of factories to try to autoplug */ GValueArray *(*autoplug_factories) (GstElement * element, GstPad * pad, GstCaps * caps); /* signal fired to sort the factories */ GValueArray *(*autoplug_sort) (GstElement * element, GstPad * pad, GstCaps * caps, GValueArray * factories); /* signal fired to select from the proposed list of factories */ GstAutoplugSelectResult (*autoplug_select) (GstElement * element, GstPad * pad, GstCaps * caps, GstElementFactory * factory); /* fired when the last group is drained */ void (*drained) (GstElement * element); }; /* signals */ enum { SIGNAL_NEW_DECODED_PAD, SIGNAL_REMOVED_DECODED_PAD, SIGNAL_UNKNOWN_TYPE, SIGNAL_AUTOPLUG_CONTINUE, SIGNAL_AUTOPLUG_FACTORIES, SIGNAL_AUTOPLUG_SELECT, SIGNAL_AUTOPLUG_SORT, SIGNAL_DRAINED, LAST_SIGNAL }; /* Properties */ enum { PROP_0, PROP_CAPS, PROP_SUBTITLE_ENCODING, PROP_SINK_CAPS, PROP_LAST }; static GstBinClass *parent_class; static guint gst_decode_bin_signals[LAST_SIGNAL] = { 0 }; static const GstElementDetails gst_decode_bin_details = GST_ELEMENT_DETAILS ("Decoder Bin", "Generic/Bin/Decoder", "Autoplug and decode to raw media", "Edward Hervey , " "Sebastian Dröge "); static void do_async_start (GstDecodeBin * dbin); static void do_async_done (GstDecodeBin * dbin); static void type_found (GstElement * typefind, guint probability, GstCaps * caps, GstDecodeBin * decode_bin); static gboolean gst_decode_bin_autoplug_continue (GstElement * element, GstPad * pad, GstCaps * caps); static GValueArray *gst_decode_bin_autoplug_factories (GstElement * element, GstPad * pad, GstCaps * caps); static GValueArray *gst_decode_bin_autoplug_sort (GstElement * element, GstPad * pad, GstCaps * caps, GValueArray * factories); static GstAutoplugSelectResult gst_decode_bin_autoplug_select (GstElement * element, GstPad * pad, GstCaps * caps, GstElementFactory * factory); static void gst_decode_bin_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_decode_bin_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static void gst_decode_bin_set_caps (GstDecodeBin * dbin, GstCaps * caps); static GstCaps *gst_decode_bin_get_caps (GstDecodeBin * dbin); static void caps_notify_cb (GstPad * pad, GParamSpec * unused, GstDecodeChain * chain); static GstPad *find_sink_pad (GstElement * element); static GstStateChangeReturn gst_decode_bin_change_state (GstElement * element, GstStateChange transition); #define EXPOSE_LOCK(dbin) G_STMT_START { \ GST_LOG_OBJECT (dbin, \ "expose locking from thread %p", \ g_thread_self ()); \ g_mutex_lock (GST_DECODE_BIN_CAST(dbin)->expose_lock); \ GST_LOG_OBJECT (dbin, \ "expose locked from thread %p", \ g_thread_self ()); \ } G_STMT_END #define EXPOSE_UNLOCK(dbin) G_STMT_START { \ GST_LOG_OBJECT (dbin, \ "expose unlocking from thread %p", \ g_thread_self ()); \ g_mutex_unlock (GST_DECODE_BIN_CAST(dbin)->expose_lock); \ } G_STMT_END #define DYN_LOCK(dbin) G_STMT_START { \ GST_LOG_OBJECT (dbin, \ "dynlocking from thread %p", \ g_thread_self ()); \ g_mutex_lock (GST_DECODE_BIN_CAST(dbin)->dyn_lock); \ GST_LOG_OBJECT (dbin, \ "dynlocked from thread %p", \ g_thread_self ()); \ } G_STMT_END #define DYN_UNLOCK(dbin) G_STMT_START { \ GST_LOG_OBJECT (dbin, \ "dynunlocking from thread %p", \ g_thread_self ()); \ g_mutex_unlock (GST_DECODE_BIN_CAST(dbin)->dyn_lock); \ } G_STMT_END /* GstDecodeGroup * * Streams belonging to the same group/chain of a media file * * When changing something here lock the parent chain! */ struct _GstDecodeGroup { GstDecodeBin *dbin; GstDecodeChain *parent; GstElement *multiqueue; /* Used for linking all child chains */ gulong overrunsig; /* the overrun signal for multiqueue */ gboolean overrun; /* TRUE if the multiqueue signaled overrun. This * means that we should really expose the group */ gboolean no_more_pads; /* TRUE if the demuxer signaled no-more-pads */ gboolean drained; /* TRUE if the all children are drained */ GList *children; /* List of GstDecodeChains in this group */ GList *reqpads; /* List of RequestPads for multiqueue, there is * exactly one RequestPad per child chain */ }; struct _GstDecodeChain { GstDecodeGroup *parent; GstDecodeBin *dbin; GMutex *lock; /* Protects this chain and its groups */ GstPad *pad; /* srcpad that caused creation of this chain */ gboolean demuxer; /* TRUE if elements->data is a demuxer */ GList *elements; /* All elements in this group, first is the latest and most downstream element */ /* Note: there are only groups if the last element of this chain * is a demuxer, otherwise the chain will end with an endpad. * The other way around this means, that endpad only exists if this * chain doesn't end with a demuxer! */ GstDecodeGroup *active_group; /* Currently active group */ GList *next_groups; /* head is newest group, tail is next group. a new group will be created only if the head group had no-more-pads. If it's only exposed all new pads will be ignored! */ GList *pending_pads; /* Pads that have no fixed caps yet */ GstDecodePad *endpad; /* Pad of this chain that could be exposed */ gboolean deadend; /* This chain is incomplete and can't be completed, e.g. no suitable decoder could be found */ /* FIXME: This should be done directly via a thread! */ GList *old_groups; /* Groups that should be freed later */ }; static void gst_decode_chain_free (GstDecodeChain * chain); static GstDecodeChain *gst_decode_chain_new (GstDecodeBin * dbin, GstDecodeGroup * group, GstPad * pad); static void gst_decode_group_hide (GstDecodeGroup * group); static void gst_decode_group_free (GstDecodeGroup * group); static GstDecodeGroup *gst_decode_group_new (GstDecodeBin * dbin, GstDecodeChain * chain); static gboolean gst_decode_chain_is_complete (GstDecodeChain * chain); static void gst_decode_chain_handle_eos (GstDecodeChain * chain); static gboolean gst_decode_chain_expose (GstDecodeChain * chain, GList ** endpads); static gboolean gst_decode_chain_is_drained (GstDecodeChain * chain); static gboolean gst_decode_group_is_complete (GstDecodeGroup * group); static GstPad *gst_decode_group_control_demuxer_pad (GstDecodeGroup * group, GstPad * pad); static gboolean gst_decode_group_is_drained (GstDecodeGroup * group); static gboolean gst_decode_bin_expose (GstDecodeBin * dbin); #define CHAIN_MUTEX_LOCK(chain) G_STMT_START { \ GST_LOG_OBJECT (chain->dbin, \ "locking chain %p from thread %p", \ chain, g_thread_self ()); \ g_mutex_lock (chain->lock); \ GST_LOG_OBJECT (chain->dbin, \ "locked chain %p from thread %p", \ chain, g_thread_self ()); \ } G_STMT_END #define CHAIN_MUTEX_UNLOCK(chain) G_STMT_START { \ GST_LOG_OBJECT (chain->dbin, \ "unlocking chain %p from thread %p", \ chain, g_thread_self ()); \ g_mutex_unlock (chain->lock); \ } G_STMT_END /* GstDecodePad * * GstPad private used for source pads of chains */ struct _GstDecodePad { GstGhostPad parent; GstDecodeBin *dbin; GstDecodeChain *chain; gboolean blocked; /* the *target* pad is blocked */ gboolean exposed; /* the pad is exposed */ gboolean drained; /* an EOS has been seen on the pad */ }; G_DEFINE_TYPE (GstDecodePad, gst_decode_pad, GST_TYPE_GHOST_PAD); #define GST_TYPE_DECODE_PAD (gst_decode_pad_get_type ()) #define GST_DECODE_PAD(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_DECODE_PAD,GstDecodePad)) static GstDecodePad *gst_decode_pad_new (GstDecodeBin * dbin, GstPad * pad, GstDecodeChain * chain); static void gst_decode_pad_activate (GstDecodePad * dpad, GstDecodeChain * chain); static void gst_decode_pad_unblock (GstDecodePad * dpad); static void gst_decode_pad_set_blocked (GstDecodePad * dpad, gboolean blocked); /******************************** * Standard GObject boilerplate * ********************************/ static void gst_decode_bin_class_init (GstDecodeBinClass * klass); static void gst_decode_bin_init (GstDecodeBin * decode_bin); static void gst_decode_bin_dispose (GObject * object); static void gst_decode_bin_finalize (GObject * object); static GType gst_decode_bin_get_type (void) { static GType gst_decode_bin_type = 0; if (!gst_decode_bin_type) { static const GTypeInfo gst_decode_bin_info = { sizeof (GstDecodeBinClass), NULL, NULL, (GClassInitFunc) gst_decode_bin_class_init, NULL, NULL, sizeof (GstDecodeBin), 0, (GInstanceInitFunc) gst_decode_bin_init, NULL }; gst_decode_bin_type = g_type_register_static (GST_TYPE_BIN, "GstDecodeBin2", &gst_decode_bin_info, 0); } return gst_decode_bin_type; } static gboolean _gst_boolean_accumulator (GSignalInvocationHint * ihint, GValue * return_accu, const GValue * handler_return, gpointer dummy) { gboolean myboolean; myboolean = g_value_get_boolean (handler_return); if (!(ihint->run_type & G_SIGNAL_RUN_CLEANUP)) g_value_set_boolean (return_accu, myboolean); /* stop emission if FALSE */ return myboolean; } /* we collect the first result */ static gboolean _gst_array_accumulator (GSignalInvocationHint * ihint, GValue * return_accu, const GValue * handler_return, gpointer dummy) { gpointer array; array = g_value_get_boxed (handler_return); if (!(ihint->run_type & G_SIGNAL_RUN_CLEANUP)) g_value_set_boxed (return_accu, array); return FALSE; } static gboolean _gst_select_accumulator (GSignalInvocationHint * ihint, GValue * return_accu, const GValue * handler_return, gpointer dummy) { GstAutoplugSelectResult res; res = g_value_get_enum (handler_return); if (!(ihint->run_type & G_SIGNAL_RUN_CLEANUP)) g_value_set_enum (return_accu, res); return FALSE; } static void gst_decode_bin_class_init (GstDecodeBinClass * klass) { GObjectClass *gobject_klass; GstElementClass *gstelement_klass; gobject_klass = (GObjectClass *) klass; gstelement_klass = (GstElementClass *) klass; parent_class = g_type_class_peek_parent (klass); gobject_klass->dispose = GST_DEBUG_FUNCPTR (gst_decode_bin_dispose); gobject_klass->finalize = GST_DEBUG_FUNCPTR (gst_decode_bin_finalize); gobject_klass->set_property = GST_DEBUG_FUNCPTR (gst_decode_bin_set_property); gobject_klass->get_property = GST_DEBUG_FUNCPTR (gst_decode_bin_get_property); /** * GstDecodeBin2::new-decoded-pad: * @bin: The decodebin * @pad: The newly created pad * @islast: #TRUE if this is the last pad to be added. Deprecated. * * This signal gets emitted as soon as a new pad of the same type as one of * the valid 'raw' types is added. */ gst_decode_bin_signals[SIGNAL_NEW_DECODED_PAD] = g_signal_new ("new-decoded-pad", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, new_decoded_pad), NULL, NULL, gst_play_marshal_VOID__OBJECT_BOOLEAN, G_TYPE_NONE, 2, GST_TYPE_PAD, G_TYPE_BOOLEAN); /** * GstDecodeBin2::removed-decoded-pad: * @bin: The decodebin * @pad: The pad that was removed * * This signal is emitted when a 'final' caps pad has been removed. */ gst_decode_bin_signals[SIGNAL_REMOVED_DECODED_PAD] = g_signal_new ("removed-decoded-pad", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, removed_decoded_pad), NULL, NULL, gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_PAD); /** * GstDecodeBin2::unknown-type: * @bin: The decodebin * @pad: The new pad containing caps that cannot be resolved to a 'final' * stream type. * @caps: The #GstCaps of the pad that cannot be resolved. * * This signal is emitted when a pad for which there is no further possible * decoding is added to the decodebin. */ gst_decode_bin_signals[SIGNAL_UNKNOWN_TYPE] = g_signal_new ("unknown-type", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, unknown_type), NULL, NULL, gst_marshal_VOID__OBJECT_BOXED, G_TYPE_NONE, 2, GST_TYPE_PAD, GST_TYPE_CAPS); /** * GstDecodeBin2::autoplug-continue: * @bin: The decodebin * @pad: The #GstPad. * @caps: The #GstCaps found. * * This signal is emitted whenever decodebin2 finds a new stream. It is * emitted before looking for any elements that can handle that stream. * * Returns: #TRUE if you wish decodebin2 to look for elements that can * handle the given @caps. If #FALSE, those caps will be considered as * final and the pad will be exposed as such (see 'new-decoded-pad' * signal). */ gst_decode_bin_signals[SIGNAL_AUTOPLUG_CONTINUE] = g_signal_new ("autoplug-continue", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, autoplug_continue), _gst_boolean_accumulator, NULL, gst_play_marshal_BOOLEAN__OBJECT_BOXED, G_TYPE_BOOLEAN, 2, GST_TYPE_PAD, GST_TYPE_CAPS); /** * GstDecodeBin2::autoplug-factories: * @bin: The decodebin * @pad: The #GstPad. * @caps: The #GstCaps found. * * This function is emited when an array of possible factories for @caps on * @pad is needed. Decodebin2 will by default return an array with all * compatible factories, sorted by rank. * * If this function returns NULL, @pad will be exposed as a final caps. * * If this function returns an empty array, the pad will be considered as * having an unhandled type media type. * * Returns: a #GValueArray* with a list of factories to try. The factories are * by default tried in the returned order or based on the index returned by * "autoplug-select". */ gst_decode_bin_signals[SIGNAL_AUTOPLUG_FACTORIES] = g_signal_new ("autoplug-factories", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, autoplug_factories), _gst_array_accumulator, NULL, gst_play_marshal_BOXED__OBJECT_BOXED, G_TYPE_VALUE_ARRAY, 2, GST_TYPE_PAD, GST_TYPE_CAPS); /** * GstDecodeBin2::autoplug-sort: * @bin: The decodebin * @pad: The #GstPad. * @caps: The #GstCaps. * @factories: A #GValueArray of possible #GstElementFactory to use. * * Once decodebin2 has found the possible #GstElementFactory objects to try * for @caps on @pad, this signal is emited. The purpose of the signal is for * the application to perform additional sorting or filtering on the element * factory array. * * The callee should copy and modify @factories. * * Returns: A new sorted array of #GstElementFactory objects. */ gst_decode_bin_signals[SIGNAL_AUTOPLUG_SORT] = g_signal_new ("autoplug-sort", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, autoplug_sort), NULL, NULL, gst_play_marshal_BOXED__OBJECT_BOXED_BOXED, G_TYPE_VALUE_ARRAY, 3, GST_TYPE_PAD, GST_TYPE_CAPS, G_TYPE_VALUE_ARRAY); /** * GstDecodeBin2::autoplug-select: * @bin: The decodebin * @pad: The #GstPad. * @caps: The #GstCaps. * @factory: A #GstElementFactory to use * * This signal is emitted once decodebin2 has found all the possible * #GstElementFactory that can be used to handle the given @caps. For each of * those factories, this signal is emited. * * The signal handler should return a #GST_TYPE_AUTOPLUG_SELECT_RESULT enum * value indicating what decodebin2 should do next. * * A value of #GST_AUTOPLUG_SELECT_TRY will try to autoplug an element from * @factory. * * A value of #GST_AUTOPLUG_SELECT_EXPOSE will expose @pad without plugging * any element to it. * * A value of #GST_AUTOPLUG_SELECT_SKIP will skip @factory and move to the * next factory. * * Returns: a #GST_TYPE_AUTOPLUG_SELECT_RESULT that indicates the required * operation. the default handler will always return * #GST_AUTOPLUG_SELECT_TRY. */ gst_decode_bin_signals[SIGNAL_AUTOPLUG_SELECT] = g_signal_new ("autoplug-select", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, autoplug_select), _gst_select_accumulator, NULL, gst_play_marshal_ENUM__OBJECT_BOXED_OBJECT, GST_TYPE_AUTOPLUG_SELECT_RESULT, 3, GST_TYPE_PAD, GST_TYPE_CAPS, GST_TYPE_ELEMENT_FACTORY); /** * GstDecodeBin2::drained * @bin: The decodebin * * This signal is emitted once decodebin2 has finished decoding all the data. * * Since: 0.10.16 */ gst_decode_bin_signals[SIGNAL_DRAINED] = g_signal_new ("drained", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, drained), NULL, NULL, gst_marshal_VOID__VOID, G_TYPE_NONE, 0, G_TYPE_NONE); g_object_class_install_property (gobject_klass, PROP_CAPS, g_param_spec_boxed ("caps", "Caps", "The caps on which to stop decoding.", GST_TYPE_CAPS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_klass, PROP_SUBTITLE_ENCODING, g_param_spec_string ("subtitle-encoding", "subtitle encoding", "Encoding to assume if input subtitles are not in UTF-8 encoding. " "If not set, the GST_SUBTITLE_ENCODING environment variable will " "be checked for an encoding to use. If that is not set either, " "ISO-8859-15 will be assumed.", NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_klass, PROP_SINK_CAPS, g_param_spec_boxed ("sink-caps", "Sink Caps", "The caps of the input data. (NULL = use typefind element)", GST_TYPE_CAPS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); klass->autoplug_continue = GST_DEBUG_FUNCPTR (gst_decode_bin_autoplug_continue); klass->autoplug_factories = GST_DEBUG_FUNCPTR (gst_decode_bin_autoplug_factories); klass->autoplug_sort = GST_DEBUG_FUNCPTR (gst_decode_bin_autoplug_sort); klass->autoplug_select = GST_DEBUG_FUNCPTR (gst_decode_bin_autoplug_select); gst_element_class_add_pad_template (gstelement_klass, gst_static_pad_template_get (&decoder_bin_sink_template)); gst_element_class_add_pad_template (gstelement_klass, gst_static_pad_template_get (&decoder_bin_src_template)); gst_element_class_set_details (gstelement_klass, &gst_decode_bin_details); gstelement_klass->change_state = GST_DEBUG_FUNCPTR (gst_decode_bin_change_state); } static void gst_decode_bin_init (GstDecodeBin * decode_bin) { /* first filter out the interesting element factories */ decode_bin->factories = gst_factory_list_get_elements (GST_FACTORY_LIST_DECODER); /* we create the typefind element only once */ decode_bin->typefind = gst_element_factory_make ("typefind", "typefind"); if (!decode_bin->typefind) { g_warning ("can't find typefind element, decodebin will not work"); } else { GstPad *pad; GstPad *gpad; /* add the typefind element */ if (!gst_bin_add (GST_BIN (decode_bin), decode_bin->typefind)) { g_warning ("Could not add typefind element, decodebin will not work"); gst_object_unref (decode_bin->typefind); decode_bin->typefind = NULL; } /* get the sinkpad */ pad = gst_element_get_static_pad (decode_bin->typefind, "sink"); /* ghost the sink pad to ourself */ gpad = gst_ghost_pad_new ("sink", pad); gst_pad_set_active (gpad, TRUE); gst_element_add_pad (GST_ELEMENT (decode_bin), gpad); gst_object_unref (pad); /* connect a signal to find out when the typefind element found * a type */ decode_bin->have_type_id = g_signal_connect (G_OBJECT (decode_bin->typefind), "have-type", G_CALLBACK (type_found), decode_bin); } decode_bin->expose_lock = g_mutex_new (); decode_bin->decode_chain = NULL; decode_bin->dyn_lock = g_mutex_new (); decode_bin->shutdown = FALSE; decode_bin->blocked_pads = NULL; decode_bin->caps = gst_caps_from_string ("video/x-raw-yuv;video/x-raw-rgb;video/x-raw-gray;" "audio/x-raw-int;audio/x-raw-float;" "text/plain;text/x-pango-markup;" "video/x-dvd-subpicture; subpicture/x-pgs"); } static void gst_decode_bin_dispose (GObject * object) { GstDecodeBin *decode_bin; decode_bin = GST_DECODE_BIN (object); if (decode_bin->factories) g_value_array_free (decode_bin->factories); decode_bin->factories = NULL; if (decode_bin->decode_chain) gst_decode_chain_free (decode_bin->decode_chain); decode_bin->decode_chain = NULL; if (decode_bin->caps) gst_caps_unref (decode_bin->caps); decode_bin->caps = NULL; g_free (decode_bin->encoding); decode_bin->encoding = NULL; g_list_free (decode_bin->subtitles); decode_bin->subtitles = NULL; G_OBJECT_CLASS (parent_class)->dispose (object); } static void gst_decode_bin_finalize (GObject * object) { GstDecodeBin *decode_bin; decode_bin = GST_DECODE_BIN (object); if (decode_bin->expose_lock) { g_mutex_free (decode_bin->expose_lock); decode_bin->expose_lock = NULL; } if (decode_bin->dyn_lock) { g_mutex_free (decode_bin->dyn_lock); decode_bin->dyn_lock = NULL; } G_OBJECT_CLASS (parent_class)->finalize (object); } /* _set_caps * Changes the caps on which decodebin will stop decoding. * Will unref the previously set one. The refcount of the given caps will be * increased. * @caps can be NULL. * * MT-safe */ static void gst_decode_bin_set_caps (GstDecodeBin * dbin, GstCaps * caps) { GST_DEBUG_OBJECT (dbin, "Setting new caps: %" GST_PTR_FORMAT, caps); GST_OBJECT_LOCK (dbin); gst_caps_replace (&dbin->caps, caps); GST_OBJECT_UNLOCK (dbin); } /* _get_caps * Returns the currently configured caps on which decodebin will stop decoding. * The returned caps (if not NULL), will have its refcount incremented. * * MT-safe */ static GstCaps * gst_decode_bin_get_caps (GstDecodeBin * dbin) { GstCaps *caps; GST_DEBUG_OBJECT (dbin, "Getting currently set caps"); GST_OBJECT_LOCK (dbin); caps = dbin->caps; if (caps) gst_caps_ref (caps); GST_OBJECT_UNLOCK (dbin); return caps; } static void gst_decode_bin_set_sink_caps (GstDecodeBin * dbin, GstCaps * caps) { GST_DEBUG_OBJECT (dbin, "Setting new caps: %" GST_PTR_FORMAT, caps); g_object_set (dbin->typefind, "force-caps", caps, NULL); } static GstCaps * gst_decode_bin_get_sink_caps (GstDecodeBin * dbin) { GstCaps *caps; GST_DEBUG_OBJECT (dbin, "Getting currently set caps"); g_object_get (dbin->typefind, "force-caps", &caps, NULL); return caps; } static void gst_decode_bin_set_subs_encoding (GstDecodeBin * dbin, const gchar * encoding) { GList *walk; GST_DEBUG_OBJECT (dbin, "Setting new encoding: %s", GST_STR_NULL (encoding)); GST_OBJECT_LOCK (dbin); g_free (dbin->encoding); dbin->encoding = g_strdup (encoding); /* set the subtitle encoding on all added elements */ for (walk = dbin->subtitles; walk; walk = g_list_next (walk)) { g_object_set (G_OBJECT (walk->data), "subtitle-encoding", dbin->encoding, NULL); } GST_OBJECT_UNLOCK (dbin); } static gchar * gst_decode_bin_get_subs_encoding (GstDecodeBin * dbin) { gchar *encoding; GST_DEBUG_OBJECT (dbin, "Getting currently set encoding"); GST_OBJECT_LOCK (dbin); encoding = g_strdup (dbin->encoding); GST_OBJECT_UNLOCK (dbin); return encoding; } static void gst_decode_bin_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstDecodeBin *dbin; dbin = GST_DECODE_BIN (object); switch (prop_id) { case PROP_CAPS: gst_decode_bin_set_caps (dbin, g_value_get_boxed (value)); break; case PROP_SUBTITLE_ENCODING: gst_decode_bin_set_subs_encoding (dbin, g_value_get_string (value)); break; case PROP_SINK_CAPS: gst_decode_bin_set_sink_caps (dbin, g_value_get_boxed (value)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_decode_bin_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstDecodeBin *dbin; dbin = GST_DECODE_BIN (object); switch (prop_id) { case PROP_CAPS: g_value_take_boxed (value, gst_decode_bin_get_caps (dbin)); break; case PROP_SUBTITLE_ENCODING: g_value_take_string (value, gst_decode_bin_get_subs_encoding (dbin)); break; case PROP_SINK_CAPS: g_value_take_boxed (value, gst_decode_bin_get_sink_caps (dbin)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } /***** * Default autoplug signal handlers *****/ static gboolean gst_decode_bin_autoplug_continue (GstElement * element, GstPad * pad, GstCaps * caps) { GST_DEBUG_OBJECT (element, "autoplug-continue returns TRUE"); /* by default we always continue */ return TRUE; } static GValueArray * gst_decode_bin_autoplug_factories (GstElement * element, GstPad * pad, GstCaps * caps) { GValueArray *result; GST_DEBUG_OBJECT (element, "finding factories"); /* return all compatible factories for caps */ result = gst_factory_list_filter (GST_DECODE_BIN_CAST (element)->factories, caps); GST_DEBUG_OBJECT (element, "autoplug-factories returns %p", result); return result; } static GValueArray * gst_decode_bin_autoplug_sort (GstElement * element, GstPad * pad, GstCaps * caps, GValueArray * factories) { GValueArray *result; result = g_value_array_copy (factories); GST_DEBUG_OBJECT (element, "autoplug-sort returns %p", result); /* return input */ return result; } static GstAutoplugSelectResult gst_decode_bin_autoplug_select (GstElement * element, GstPad * pad, GstCaps * caps, GstElementFactory * factory) { GST_DEBUG_OBJECT (element, "default autoplug-select returns TRY"); /* Try factory. */ return GST_AUTOPLUG_SELECT_TRY; } /******** * Discovery methods *****/ static gboolean are_raw_caps (GstDecodeBin * dbin, GstCaps * caps); static gboolean is_demuxer_element (GstElement * srcelement); static gboolean connect_pad (GstDecodeBin * dbin, GstElement * src, GstDecodePad * dpad, GstPad * pad, GstCaps * caps, GValueArray * factories, GstDecodeChain * chain); static gboolean connect_element (GstDecodeBin * dbin, GstElement * element, GstDecodeChain * chain); static void expose_pad (GstDecodeBin * dbin, GstElement * src, GstDecodePad * dpad, GstPad * pad, GstDecodeChain * chain); static void pad_added_cb (GstElement * element, GstPad * pad, GstDecodeChain * chain); static void pad_removed_cb (GstElement * element, GstPad * pad, GstDecodeChain * chain); static void no_more_pads_cb (GstElement * element, GstDecodeChain * chain); static GstDecodeGroup *gst_decode_chain_get_current_group (GstDecodeChain * chain); /* called when a new pad is discovered. It will perform some basic actions * before trying to link something to it. * * - Check the caps, don't do anything when there are no caps or when they have * no good type. * - signal AUTOPLUG_CONTINUE to check if we need to continue autoplugging this * pad. * - if the caps are non-fixed, setup a handler to continue autoplugging when * the caps become fixed (connect to notify::caps). * - get list of factories to autoplug. * - continue autoplugging to one of the factories. */ static void analyze_new_pad (GstDecodeBin * dbin, GstElement * src, GstPad * pad, GstCaps * caps, GstDecodeChain * chain) { gboolean apcontinue = TRUE; GValueArray *factories = NULL, *result = NULL; GstDecodePad *dpad; GST_DEBUG_OBJECT (dbin, "Pad %s:%s caps:%" GST_PTR_FORMAT, GST_DEBUG_PAD_NAME (pad), caps); if (chain->elements && src != chain->elements->data) { GST_ERROR_OBJECT (dbin, "New pad from not the last element in this chain"); return; } if (chain->endpad) { GST_ERROR_OBJECT (dbin, "New pad in a chain that is already complete"); return; } if (chain->demuxer) { GstDecodeGroup *group; GstDecodeChain *oldchain = chain; CHAIN_MUTEX_LOCK (oldchain); group = gst_decode_chain_get_current_group (chain); if (group) { chain = gst_decode_chain_new (dbin, group, pad); group->children = g_list_prepend (group->children, chain); } CHAIN_MUTEX_UNLOCK (oldchain); if (!group) { GST_WARNING_OBJECT (dbin, "No current group"); return; } } if ((caps == NULL) || gst_caps_is_empty (caps)) goto unknown_type; if (gst_caps_is_any (caps)) goto any_caps; dpad = gst_decode_pad_new (dbin, pad, chain); /* 1. Emit 'autoplug-continue' the result will tell us if this pads needs * further autoplugging. */ g_signal_emit (G_OBJECT (dbin), gst_decode_bin_signals[SIGNAL_AUTOPLUG_CONTINUE], 0, dpad, caps, &apcontinue); /* 1.a if autoplug-continue is FALSE or caps is a raw format, goto pad_is_final */ if ((!apcontinue) || are_raw_caps (dbin, caps)) goto expose_pad; /* 1.b when the caps are not fixed yet, we can't be sure what element to * connect. We delay autoplugging until the caps are fixed */ if (!gst_caps_is_fixed (caps)) goto non_fixed; /* 1.c else get the factories and if there's no compatible factory goto * unknown_type */ g_signal_emit (G_OBJECT (dbin), gst_decode_bin_signals[SIGNAL_AUTOPLUG_FACTORIES], 0, dpad, caps, &factories); /* NULL means that we can expose the pad */ if (factories == NULL) goto expose_pad; /* if the array is empty, we have an unknown type */ if (factories->n_values == 0) { /* no compatible factories */ g_value_array_free (factories); gst_object_unref (dpad); goto unknown_type; } /* 1.d sort some more. */ g_signal_emit (G_OBJECT (dbin), gst_decode_bin_signals[SIGNAL_AUTOPLUG_SORT], 0, dpad, caps, factories, &result); g_value_array_free (factories); factories = result; /* 1.e else continue autoplugging something from the list. */ GST_LOG_OBJECT (pad, "Let's continue discovery on this pad"); connect_pad (dbin, src, dpad, pad, caps, factories, chain); gst_object_unref (dpad); g_value_array_free (factories); return; expose_pad: { GST_LOG_OBJECT (dbin, "Pad is final. autoplug-continue:%d", apcontinue); expose_pad (dbin, src, dpad, pad, chain); gst_object_unref (dpad); return; } unknown_type: { GST_LOG_OBJECT (pad, "Unknown type, firing signal"); g_signal_emit (G_OBJECT (dbin), gst_decode_bin_signals[SIGNAL_UNKNOWN_TYPE], 0, pad, caps); chain->deadend = TRUE; gst_element_post_message (GST_ELEMENT_CAST (dbin), gst_missing_decoder_message_new (GST_ELEMENT_CAST (dbin), caps)); /* Try to expose anything */ EXPOSE_LOCK (dbin); if (gst_decode_chain_is_complete (dbin->decode_chain)) { gst_decode_bin_expose (dbin); } EXPOSE_UNLOCK (dbin); do_async_done (dbin); if (src == dbin->typefind) { gchar *desc; if (caps && !gst_caps_is_empty (caps)) { desc = gst_pb_utils_get_decoder_description (caps); GST_ELEMENT_ERROR (dbin, STREAM, CODEC_NOT_FOUND, (_("A %s plugin is required to play this stream, " "but not installed."), desc), ("No decoder to handle media type '%s'", gst_structure_get_name (gst_caps_get_structure (caps, 0)))); g_free (desc); } else { GST_ELEMENT_ERROR (dbin, STREAM, TYPE_NOT_FOUND, (_("Could not determine type of stream")), ("Stream caps %" GST_PTR_FORMAT, caps)); } } return; } non_fixed: { GST_DEBUG_OBJECT (pad, "pad has non-fixed caps delay autoplugging"); gst_object_unref (dpad); goto setup_caps_delay; } any_caps: { GST_WARNING_OBJECT (pad, "pad has ANY caps, not able to autoplug to anything"); goto setup_caps_delay; } setup_caps_delay: { /* connect to caps notification */ CHAIN_MUTEX_LOCK (chain); GST_LOG_OBJECT (dbin, "Chain %p has now %d dynamic pads", chain, g_list_length (chain->pending_pads)); chain->pending_pads = g_list_prepend (chain->pending_pads, gst_object_ref (pad)); CHAIN_MUTEX_UNLOCK (chain); g_signal_connect (G_OBJECT (pad), "notify::caps", G_CALLBACK (caps_notify_cb), chain); return; } } /* connect_pad: * * Try to connect the given pad to an element created from one of the factories, * and recursively. * * Note that dpad is ghosting pad, and so pad is linked; be sure to unset dpad's * target before trying to link pad. * * Returns TRUE if an element was properly created and linked */ static gboolean connect_pad (GstDecodeBin * dbin, GstElement * src, GstDecodePad * dpad, GstPad * pad, GstCaps * caps, GValueArray * factories, GstDecodeChain * chain) { gboolean res = FALSE; GstPad *mqpad = NULL; gboolean is_demuxer = chain->parent && !chain->elements; /* First pad after the demuxer */ g_return_val_if_fail (factories != NULL, FALSE); g_return_val_if_fail (factories->n_values > 0, FALSE); GST_DEBUG_OBJECT (dbin, "pad %s:%s , chain:%p", GST_DEBUG_PAD_NAME (pad), chain); /* 1. is element demuxer or parser */ if (is_demuxer) { GST_LOG_OBJECT (src, "is a demuxer, connecting the pad through multiqueue '%s'", GST_OBJECT_NAME (chain->parent->multiqueue)); gst_ghost_pad_set_target (GST_GHOST_PAD (dpad), NULL); if (!(mqpad = gst_decode_group_control_demuxer_pad (chain->parent, pad))) goto beach; src = chain->parent->multiqueue; pad = mqpad; gst_ghost_pad_set_target (GST_GHOST_PAD (dpad), pad); } /* 2. Try to create an element and link to it */ while (factories->n_values > 0) { GstAutoplugSelectResult ret; GstElementFactory *factory; GstElement *element; GstPad *sinkpad; gboolean subtitle; /* Set dpad target to pad again, it might've been unset * below but we came back here because something failed */ gst_ghost_pad_set_target (GST_GHOST_PAD (dpad), pad); /* take first factory */ factory = g_value_get_object (g_value_array_get_nth (factories, 0)); /* Remove selected factory from the list. */ g_value_array_remove (factories, 0); /* emit autoplug-select to see what we should do with it. */ g_signal_emit (G_OBJECT (dbin), gst_decode_bin_signals[SIGNAL_AUTOPLUG_SELECT], 0, dpad, caps, factory, &ret); switch (ret) { case GST_AUTOPLUG_SELECT_TRY: GST_DEBUG_OBJECT (dbin, "autoplug select requested try"); break; case GST_AUTOPLUG_SELECT_EXPOSE: GST_DEBUG_OBJECT (dbin, "autoplug select requested expose"); /* expose the pad, we don't have the source element */ expose_pad (dbin, src, dpad, pad, chain); res = TRUE; goto beach; case GST_AUTOPLUG_SELECT_SKIP: GST_DEBUG_OBJECT (dbin, "autoplug select requested skip"); continue; default: GST_WARNING_OBJECT (dbin, "autoplug select returned unhandled %d", ret); break; } /* 2.0. Unlink pad */ gst_ghost_pad_set_target (GST_GHOST_PAD (dpad), NULL); /* 2.1. Try to create an element */ if ((element = gst_element_factory_create (factory, NULL)) == NULL) { GST_WARNING_OBJECT (dbin, "Could not create an element from %s", gst_plugin_feature_get_name (GST_PLUGIN_FEATURE (factory))); continue; } /* ... activate it ... We do this before adding it to the bin so that we * don't accidentally make it post error messages that will stop * everything. */ if ((gst_element_set_state (element, GST_STATE_READY)) == GST_STATE_CHANGE_FAILURE) { GST_WARNING_OBJECT (dbin, "Couldn't set %s to READY", GST_ELEMENT_NAME (element)); gst_object_unref (element); continue; } /* 2.3. Find its sink pad, this should work after activating it. */ if (!(sinkpad = find_sink_pad (element))) { GST_WARNING_OBJECT (dbin, "Element %s doesn't have a sink pad", GST_ELEMENT_NAME (element)); gst_element_set_state (element, GST_STATE_NULL); gst_object_unref (element); continue; } /* 2.4 add it ... */ if (!(gst_bin_add (GST_BIN_CAST (dbin), element))) { GST_WARNING_OBJECT (dbin, "Couldn't add %s to the bin", GST_ELEMENT_NAME (element)); gst_object_unref (sinkpad); gst_element_set_state (element, GST_STATE_NULL); gst_object_unref (element); continue; } /* 2.5 ...and try to link */ if ((gst_pad_link (pad, sinkpad)) != GST_PAD_LINK_OK) { GST_WARNING_OBJECT (dbin, "Link failed on pad %s:%s", GST_DEBUG_PAD_NAME (sinkpad)); gst_element_set_state (element, GST_STATE_NULL); gst_object_unref (sinkpad); gst_bin_remove (GST_BIN (dbin), element); continue; } gst_object_unref (sinkpad); GST_LOG_OBJECT (dbin, "linked on pad %s:%s", GST_DEBUG_PAD_NAME (pad)); CHAIN_MUTEX_LOCK (chain); chain->elements = g_list_prepend (chain->elements, gst_object_ref (element)); chain->demuxer = is_demuxer_element (element); CHAIN_MUTEX_UNLOCK (chain); /* link this element further */ connect_element (dbin, element, chain); /* try to configure the subtitle encoding property when we can */ if (g_object_class_find_property (G_OBJECT_GET_CLASS (element), "subtitle-encoding")) { GST_DEBUG_OBJECT (dbin, "setting subtitle-encoding=%s to element", dbin->encoding); g_object_set (G_OBJECT (element), "subtitle-encoding", dbin->encoding, NULL); subtitle = TRUE; } else subtitle = FALSE; /* Bring the element to the state of the parent */ if ((gst_element_set_state (element, GST_STATE_PAUSED)) == GST_STATE_CHANGE_FAILURE) { GstElement *tmp = NULL; GST_WARNING_OBJECT (dbin, "Couldn't set %s to PAUSED", GST_ELEMENT_NAME (element)); /* Remove all elements in this chain that were just added. No * other thread could've added elements in the meantime */ CHAIN_MUTEX_LOCK (chain); do { tmp = chain->elements->data; gst_element_set_state (tmp, GST_STATE_NULL); gst_bin_remove (GST_BIN (dbin), tmp); chain->elements = g_list_delete_link (chain->elements, chain->elements); } while (tmp != element); CHAIN_MUTEX_UNLOCK (chain); continue; } if (subtitle) { GST_OBJECT_LOCK (dbin); /* we added the element now, add it to the list of subtitle-encoding * elements when we can set the property */ dbin->subtitles = g_list_prepend (dbin->subtitles, element); GST_OBJECT_UNLOCK (dbin); } res = TRUE; break; } beach: if (mqpad) gst_object_unref (mqpad); return res; } static gboolean connect_element (GstDecodeBin * dbin, GstElement * element, GstDecodeChain * chain) { GList *pads; gboolean res = TRUE; gboolean dynamic = FALSE; GList *to_connect = NULL; GST_DEBUG_OBJECT (dbin, "Attempting to connect element %s [chain:%p] further", GST_ELEMENT_NAME (element), chain); /* 1. Loop over pad templates, grabbing existing pads along the way */ for (pads = GST_ELEMENT_GET_CLASS (element)->padtemplates; pads; pads = g_list_next (pads)) { GstPadTemplate *templ = GST_PAD_TEMPLATE (pads->data); const gchar *templ_name; /* we are only interested in source pads */ if (GST_PAD_TEMPLATE_DIRECTION (templ) != GST_PAD_SRC) continue; templ_name = GST_PAD_TEMPLATE_NAME_TEMPLATE (templ); GST_DEBUG_OBJECT (dbin, "got a source pad template %s", templ_name); /* figure out what kind of pad this is */ switch (GST_PAD_TEMPLATE_PRESENCE (templ)) { case GST_PAD_ALWAYS: { /* get the pad that we need to autoplug */ GstPad *pad = gst_element_get_static_pad (element, templ_name); if (pad) { GST_DEBUG_OBJECT (dbin, "got the pad for always template %s", templ_name); /* here is the pad, we need to autoplug it */ to_connect = g_list_prepend (to_connect, pad); } else { /* strange, pad is marked as always but it's not * there. Fix the element */ GST_WARNING_OBJECT (dbin, "could not get the pad for always template %s", templ_name); } break; } case GST_PAD_SOMETIMES: { /* try to get the pad to see if it is already created or * not */ GstPad *pad = gst_element_get_static_pad (element, templ_name); if (pad) { GST_DEBUG_OBJECT (dbin, "got the pad for sometimes template %s", templ_name); /* the pad is created, we need to autoplug it */ to_connect = g_list_prepend (to_connect, pad); } else { GST_DEBUG_OBJECT (dbin, "did not get the sometimes pad of template %s", templ_name); /* we have an element that will create dynamic pads */ dynamic = TRUE; } break; } case GST_PAD_REQUEST: /* ignore request pads */ GST_DEBUG_OBJECT (dbin, "ignoring request padtemplate %s", templ_name); break; } } /* 2. if there are more potential pads, connect to relevant signals */ if (dynamic) { GST_LOG_OBJECT (dbin, "Adding signals to element %s in chain %p", GST_ELEMENT_NAME (element), chain); g_signal_connect (G_OBJECT (element), "pad-added", G_CALLBACK (pad_added_cb), chain); g_signal_connect (G_OBJECT (element), "pad-removed", G_CALLBACK (pad_removed_cb), chain); g_signal_connect (G_OBJECT (element), "no-more-pads", G_CALLBACK (no_more_pads_cb), chain); } /* 3. for every available pad, connect it */ for (pads = to_connect; pads; pads = g_list_next (pads)) { GstPad *pad = GST_PAD_CAST (pads->data); GstCaps *caps; caps = gst_pad_get_caps (pad); analyze_new_pad (dbin, element, pad, caps, chain); if (caps) gst_caps_unref (caps); gst_object_unref (pad); } g_list_free (to_connect); return res; } /* expose_pad: * * Expose the given pad on the chain as a decoded pad. */ static void expose_pad (GstDecodeBin * dbin, GstElement * src, GstDecodePad * dpad, GstPad * pad, GstDecodeChain * chain) { GstPad *mqpad = NULL; GST_DEBUG_OBJECT (dbin, "pad %s:%s, chain:%p", GST_DEBUG_PAD_NAME (pad), chain); /* If this is the first pad for this chain, there are no other elements * and the source element is not the multiqueue we must link through the * multiqueue. * * This is the case if a demuxer directly exposed a raw pad. */ if (chain->parent && !chain->elements && src != chain->parent->multiqueue) { GST_LOG_OBJECT (src, "connecting the pad through multiqueue"); gst_ghost_pad_set_target (GST_GHOST_PAD (dpad), NULL); if (!(mqpad = gst_decode_group_control_demuxer_pad (chain->parent, pad))) goto beach; pad = mqpad; gst_ghost_pad_set_target (GST_GHOST_PAD (dpad), pad); } gst_decode_pad_activate (dpad, chain); chain->endpad = gst_object_ref (dpad); EXPOSE_LOCK (dbin); if (gst_decode_chain_is_complete (dbin->decode_chain)) { gst_decode_bin_expose (dbin); } EXPOSE_UNLOCK (dbin); if (mqpad) gst_object_unref (mqpad); beach: return; } static void type_found (GstElement * typefind, guint probability, GstCaps * caps, GstDecodeBin * decode_bin) { GstPad *pad; GST_DEBUG_OBJECT (decode_bin, "typefind found caps %" GST_PTR_FORMAT, caps); /* If the typefinder (but not something else) finds text/plain - i.e. that's * the top-level type of the file - then error out. */ if (gst_structure_has_name (gst_caps_get_structure (caps, 0), "text/plain")) { GST_ELEMENT_ERROR (decode_bin, STREAM, WRONG_TYPE, (_("This appears to be a text file")), ("decodebin2 cannot decode plain text files")); goto exit; } /* FIXME: we can only deal with one type, we don't yet support dynamically changing * caps from the typefind element */ if (decode_bin->have_type || decode_bin->decode_chain) goto exit; decode_bin->have_type = TRUE; pad = gst_element_get_static_pad (typefind, "src"); decode_bin->decode_chain = gst_decode_chain_new (decode_bin, NULL, pad); analyze_new_pad (decode_bin, typefind, pad, caps, decode_bin->decode_chain); gst_object_unref (pad); exit: return; } static void pad_added_cb (GstElement * element, GstPad * pad, GstDecodeChain * chain) { GstCaps *caps; GstDecodeBin *dbin; dbin = chain->dbin; GST_DEBUG_OBJECT (pad, "pad added, chain:%p", chain); caps = gst_pad_get_caps (pad); analyze_new_pad (dbin, element, pad, caps, chain); if (caps) gst_caps_unref (caps); EXPOSE_LOCK (dbin); if (gst_decode_chain_is_complete (dbin->decode_chain)) { GST_LOG_OBJECT (dbin, "That was the last dynamic object, now attempting to expose the group"); if (!gst_decode_bin_expose (dbin)) GST_WARNING_OBJECT (dbin, "Couldn't expose group"); } EXPOSE_UNLOCK (dbin); } static void pad_removed_cb (GstElement * element, GstPad * pad, GstDecodeChain * chain) { GList *l; GST_LOG_OBJECT (pad, "pad removed, chain:%p", chain); /* In fact, we don't have to do anything here, the active group will be * removed when the group's multiqueue is drained */ CHAIN_MUTEX_LOCK (chain); for (l = chain->pending_pads; l; l = l->next) { GstPad *opad = l->data; if (pad == opad) { g_signal_handlers_disconnect_by_func (pad, caps_notify_cb, chain); gst_object_unref (pad); chain->pending_pads = g_list_delete_link (chain->pending_pads, l); break; } } CHAIN_MUTEX_UNLOCK (chain); } static void no_more_pads_cb (GstElement * element, GstDecodeChain * chain) { GstDecodeGroup *group = NULL; GST_LOG_OBJECT (element, "got no more pads"); if (!chain->elements || (GstElement *) chain->elements->data != element) { GST_LOG_OBJECT (chain->dbin, "no-more-pads from old chain element '%s'", GST_OBJECT_NAME (element)); return; } else if (!chain->demuxer) { GST_LOG_OBJECT (chain->dbin, "no-more-pads from a non-demuxer element '%s'", GST_OBJECT_NAME (element)); return; } CHAIN_MUTEX_LOCK (chain); /* when we received no_more_pads, we can complete the pads of the chain */ if (!chain->next_groups && chain->active_group) { group = chain->active_group; } else if (chain->next_groups) { group = chain->next_groups->data; } if (!group) { GST_ERROR_OBJECT (chain->dbin, "can't find group for element"); CHAIN_MUTEX_UNLOCK (chain); return; } GST_DEBUG_OBJECT (element, "Setting group %p to complete", group); group->no_more_pads = TRUE; CHAIN_MUTEX_UNLOCK (chain); EXPOSE_LOCK (chain->dbin); if (gst_decode_chain_is_complete (chain->dbin->decode_chain)) { gst_decode_bin_expose (chain->dbin); } EXPOSE_UNLOCK (chain->dbin); } static void caps_notify_cb (GstPad * pad, GParamSpec * unused, GstDecodeChain * chain) { GstElement *element; GList *l; GST_LOG_OBJECT (pad, "Notified caps for pad %s:%s", GST_DEBUG_PAD_NAME (pad)); /* Disconnect this; if we still need it, we'll reconnect to this in * analyze_new_pad */ g_signal_handlers_disconnect_by_func (pad, caps_notify_cb, chain); element = GST_ELEMENT_CAST (gst_pad_get_parent (pad)); CHAIN_MUTEX_LOCK (chain); for (l = chain->pending_pads; l; l = l->next) { if (l->data == pad) { gst_object_unref (GST_OBJECT_CAST (l->data)); chain->pending_pads = g_list_delete_link (chain->pending_pads, l); break; } } CHAIN_MUTEX_UNLOCK (chain); pad_added_cb (element, pad, chain); gst_object_unref (element); } /* Decide whether an element is a demuxer based on the * klass and number/type of src pad templates it has */ static gboolean is_demuxer_element (GstElement * srcelement) { GstElementFactory *srcfactory; GstElementClass *elemclass; GList *walk; const gchar *klass; gint potential_src_pads = 0; srcfactory = gst_element_get_factory (srcelement); klass = gst_element_factory_get_klass (srcfactory); /* Can't be a demuxer unless it has Demux in the klass name */ if (!strstr (klass, "Demux")) return FALSE; /* Walk the src pad templates and count how many the element * might produce */ elemclass = GST_ELEMENT_GET_CLASS (srcelement); walk = gst_element_class_get_pad_template_list (elemclass); while (walk != NULL) { GstPadTemplate *templ; templ = (GstPadTemplate *) walk->data; if (GST_PAD_TEMPLATE_DIRECTION (templ) == GST_PAD_SRC) { switch (GST_PAD_TEMPLATE_PRESENCE (templ)) { case GST_PAD_ALWAYS: case GST_PAD_SOMETIMES: if (strstr (GST_PAD_TEMPLATE_NAME_TEMPLATE (templ), "%")) potential_src_pads += 2; /* Might make multiple pads */ else potential_src_pads += 1; break; case GST_PAD_REQUEST: potential_src_pads += 2; break; } } walk = g_list_next (walk); } if (potential_src_pads < 2) return FALSE; return TRUE; } /* Returns TRUE if the caps are raw, or if they are compatible with the caps * specified in the 'caps' property * * The decodebin_lock should be taken ! */ static gboolean are_raw_caps (GstDecodeBin * dbin, GstCaps * caps) { gboolean res; GST_LOG_OBJECT (dbin, "Checking with caps %" GST_PTR_FORMAT, caps); /* lock for getting the caps */ GST_OBJECT_LOCK (dbin); res = gst_caps_can_intersect (dbin->caps, caps); GST_OBJECT_UNLOCK (dbin); GST_LOG_OBJECT (dbin, "Caps are %sfinal caps", res ? "" : "not "); return res; } /**** * GstDecodeChain functions ****/ /* gst_decode_chain_get_current_group: * * Returns the current group of this chain, to which * new chains should be attached or NULL if the last * group didn't have no-more-pads. * * Not MT-safe: Call with parent chain lock! */ static GstDecodeGroup * gst_decode_chain_get_current_group (GstDecodeChain * chain) { GstDecodeGroup *group; if (!chain->next_groups && chain->active_group && chain->active_group->overrun && !chain->active_group->no_more_pads) { GST_WARNING_OBJECT (chain->dbin, "Currently active group %p is exposed" " and wants to add a new pad without having signaled no-more-pads", chain->active_group); return NULL; } if (chain->next_groups && (group = chain->next_groups->data) && group->overrun && !group->no_more_pads) { GST_WARNING_OBJECT (chain->dbin, "Currently newest pending group %p " "had overflow but didn't signal no-more-pads", group); return NULL; } /* Now we know that we can really return something useful */ if (!chain->active_group) { chain->active_group = group = gst_decode_group_new (chain->dbin, chain); } else if (!chain->active_group->overrun && !chain->active_group->no_more_pads) { group = chain->active_group; } else if (chain->next_groups && (group = chain->next_groups->data) && !group->overrun && !group->no_more_pads) { /* group = chain->next_groups->data */ } else { group = gst_decode_group_new (chain->dbin, chain); chain->next_groups = g_list_prepend (chain->next_groups, group); } return group; } static void gst_decode_group_free_internal (GstDecodeGroup * group, gboolean hide); static void gst_decode_chain_free_internal (GstDecodeChain * chain, gboolean hide) { GList *l; CHAIN_MUTEX_LOCK (chain); GST_DEBUG_OBJECT (chain->dbin, "%s chain %p", (hide ? "Hiding" : "Freeing"), chain); if (chain->active_group) { gst_decode_group_free_internal (chain->active_group, hide); if (!hide) chain->active_group = NULL; } for (l = chain->next_groups; l; l = l->next) { gst_decode_group_free_internal ((GstDecodeGroup *) l->data, hide); if (!hide) l->data = NULL; } if (!hide) { g_list_free (chain->next_groups); chain->next_groups = NULL; } if (!hide) { for (l = chain->old_groups; l; l = l->next) { GstDecodeGroup *group = l->data; gst_decode_group_free (group); } g_list_free (chain->old_groups); chain->old_groups = NULL; } for (l = chain->pending_pads; l; l = l->next) { GstPad *pad = GST_PAD (l->data); g_signal_handlers_disconnect_by_func (pad, caps_notify_cb, chain); gst_object_unref (pad); l->data = NULL; } g_list_free (chain->pending_pads); chain->pending_pads = NULL; for (l = chain->elements; l; l = l->next) { GstElement *element = GST_ELEMENT (l->data); g_signal_handlers_disconnect_by_func (element, pad_added_cb, chain); g_signal_handlers_disconnect_by_func (element, pad_removed_cb, chain); g_signal_handlers_disconnect_by_func (element, no_more_pads_cb, chain); if (GST_OBJECT_PARENT (element) == GST_OBJECT_CAST (chain->dbin)) gst_bin_remove (GST_BIN_CAST (chain->dbin), element); if (!hide) { gst_element_set_state (element, GST_STATE_NULL); } GST_OBJECT_LOCK (chain->dbin); /* remove possible subtitle element */ chain->dbin->subtitles = g_list_remove (chain->dbin->subtitles, element); GST_OBJECT_UNLOCK (chain->dbin); if (!hide) { gst_object_unref (element); l->data = NULL; } } if (!hide) { g_list_free (chain->elements); chain->elements = NULL; } if (chain->endpad) { if (chain->endpad->exposed) gst_element_remove_pad (GST_ELEMENT_CAST (chain->dbin), GST_PAD_CAST (chain->endpad)); chain->endpad->exposed = FALSE; if (!hide) { gst_object_unref (chain->endpad); chain->endpad = NULL; } } if (chain->pad) { gst_object_unref (chain->pad); chain->pad = NULL; } GST_DEBUG_OBJECT (chain->dbin, "%s chain %p", (hide ? "Hided" : "Freed"), chain); CHAIN_MUTEX_UNLOCK (chain); if (!hide) { g_mutex_free (chain->lock); g_slice_free (GstDecodeChain, chain); } } /* gst_decode_chain_free: * * Completely frees and removes the chain and all * child groups from decodebin2. * * MT-safe, don't hold the chain lock or any child chain's lock * when calling this! */ static void gst_decode_chain_free (GstDecodeChain * chain) { gst_decode_chain_free_internal (chain, FALSE); } /* gst_decode_chain_new: * * Creates a new decode chain and initializes it. * * It's up to the caller to add it to the list of child chains of * a group! */ static GstDecodeChain * gst_decode_chain_new (GstDecodeBin * dbin, GstDecodeGroup * parent, GstPad * pad) { GstDecodeChain *chain = g_slice_new0 (GstDecodeChain); GST_DEBUG_OBJECT (dbin, "Creating new chain %p with parent group %p", chain, parent); chain->dbin = dbin; chain->parent = parent; chain->lock = g_mutex_new (); chain->pad = gst_object_ref (pad); return chain; } /**** * GstDecodeGroup functions ****/ /* The overrun callback is used to expose groups that have not yet had their * no_more_pads called while the (large) multiqueue overflowed. When this * happens we must assume that the no_more_pads will not arrive anymore and we * must expose the pads that we have. */ static void multi_queue_overrun_cb (GstElement * queue, GstDecodeGroup * group) { GstDecodeBin *dbin; dbin = group->dbin; GST_LOG_OBJECT (dbin, "multiqueue '%s' (%p) is full", GST_OBJECT_NAME (queue), queue); group->overrun = TRUE; /* FIXME: We should make sure that everything gets exposed now * even if child chains are not complete because the will never * be complete! Ignore any non-complete chains when exposing * and never expose them later */ EXPOSE_LOCK (dbin); if (gst_decode_chain_is_complete (dbin->decode_chain)) { if (!gst_decode_bin_expose (dbin)) GST_WARNING_OBJECT (dbin, "Couldn't expose group"); } EXPOSE_UNLOCK (group->dbin); } static void gst_decode_group_free_internal (GstDecodeGroup * group, gboolean hide) { GList *l; GST_DEBUG_OBJECT (group->dbin, "%s group %p", (hide ? "Hiding" : "Freeing"), group); for (l = group->children; l; l = l->next) { GstDecodeChain *chain = (GstDecodeChain *) l->data; gst_decode_chain_free_internal (chain, hide); if (!hide) l->data = NULL; } if (!hide) { g_list_free (group->children); group->children = NULL; } if (!hide) { for (l = group->reqpads; l; l = l->next) { GstPad *pad = l->data; gst_element_release_request_pad (group->multiqueue, pad); gst_object_unref (pad); l->data = NULL; } g_list_free (group->reqpads); group->reqpads = NULL; } if (group->multiqueue) { if (group->overrunsig) { g_signal_handler_disconnect (group->multiqueue, group->overrunsig); group->overrunsig = 0; } if (GST_OBJECT_PARENT (group->multiqueue) == GST_OBJECT_CAST (group->dbin)) gst_bin_remove (GST_BIN_CAST (group->dbin), group->multiqueue); if (!hide) { gst_element_set_state (group->multiqueue, GST_STATE_NULL); gst_object_unref (group->multiqueue); group->multiqueue = NULL; } } GST_DEBUG_OBJECT (group->dbin, "%s group %p", (hide ? "Hided" : "Freed"), group); if (!hide) g_slice_free (GstDecodeGroup, group); } /* gst_decode_group_free: * * Completely frees and removes the decode group and all * it's children. * * Never call this from any streaming thread! * * Not MT-safe, call with parent's chain lock! */ static void gst_decode_group_free (GstDecodeGroup * group) { gst_decode_group_free_internal (group, FALSE); } /* gst_decode_group_hide: * * Hide the decode group only, this means that * all child endpads are removed from decodebin2 * and all signals are unconnected. * * No element is set to NULL state and completely * unreffed here. * * Can be called from streaming threads. * * Not MT-safe, call with parent's chain lock! */ static void gst_decode_group_hide (GstDecodeGroup * group) { gst_decode_group_free_internal (group, TRUE); } /* gst_decode_group_new: * @dbin: Parent decodebin * @parent: Parent chain or %NULL * * Creates a new GstDecodeGroup. It is up to the caller to add it to the list * of groups. */ static GstDecodeGroup * gst_decode_group_new (GstDecodeBin * dbin, GstDecodeChain * parent) { GstDecodeGroup *group = g_slice_new0 (GstDecodeGroup); GstElement *mq; GST_DEBUG_OBJECT (dbin, "Creating new group %p with parent chain %p", group, parent); group->dbin = dbin; group->parent = parent; mq = group->multiqueue = gst_element_factory_make ("multiqueue", NULL); if (G_UNLIKELY (!group->multiqueue)) { gst_element_post_message (GST_ELEMENT_CAST (dbin), gst_missing_element_message_new (GST_ELEMENT_CAST (dbin), "multiqueue")); GST_ELEMENT_ERROR (dbin, CORE, MISSING_PLUGIN, (NULL), ("no multiqueue!")); g_slice_free (GstDecodeGroup, group); return NULL; } g_object_set (G_OBJECT (mq), "max-size-bytes", (guint) 2 * 1024 * 1024, "max-size-time", (guint64) 0, "max-size-buffers", (guint) 0, NULL); group->overrunsig = g_signal_connect (G_OBJECT (mq), "overrun", G_CALLBACK (multi_queue_overrun_cb), group); gst_bin_add (GST_BIN (dbin), gst_object_ref (mq)); gst_element_set_state (mq, GST_STATE_PAUSED); return group; } /* gst_decode_group_control_demuxer_pad * * Adds a new demuxer srcpad to the given group. * * Returns the srcpad of the multiqueue corresponding the given pad. * Returns NULL if there was an error. */ static GstPad * gst_decode_group_control_demuxer_pad (GstDecodeGroup * group, GstPad * pad) { GstDecodeBin *dbin; GstPad *srcpad, *sinkpad; GstIterator *it = NULL; dbin = group->dbin; GST_LOG_OBJECT (dbin, "group:%p pad %s:%s", group, GST_DEBUG_PAD_NAME (pad)); srcpad = NULL; if (G_UNLIKELY (!group->multiqueue)) return NULL; if (!(sinkpad = gst_element_get_request_pad (group->multiqueue, "sink%d"))) { GST_ERROR_OBJECT (dbin, "Couldn't get sinkpad from multiqueue"); return NULL; } if ((gst_pad_link (pad, sinkpad) != GST_PAD_LINK_OK)) { GST_ERROR_OBJECT (dbin, "Couldn't link demuxer and multiqueue"); goto error; } it = gst_pad_iterate_internal_links (sinkpad); if (!it || (gst_iterator_next (it, (gpointer) & srcpad)) != GST_ITERATOR_OK || srcpad == NULL) { GST_ERROR_OBJECT (dbin, "Couldn't get srcpad from multiqueue for sinkpad %" GST_PTR_FORMAT, sinkpad); goto error; } CHAIN_MUTEX_LOCK (group->parent); group->reqpads = g_list_prepend (group->reqpads, gst_object_ref (sinkpad)); CHAIN_MUTEX_UNLOCK (group->parent); beach: if (it) gst_iterator_free (it); gst_object_unref (sinkpad); return srcpad; error: gst_element_release_request_pad (group->multiqueue, sinkpad); goto beach; } /* gst_decode_group_is_complete: * * Checks if the group is complete, this means that * a) overrun of the multiqueue or no-more-pads happened * b) all child chains are complete * * Not MT-safe, always call with decodebin expose lock */ static gboolean gst_decode_group_is_complete (GstDecodeGroup * group) { GList *l; gboolean complete = TRUE; if (!group->overrun && !group->no_more_pads) { complete = FALSE; goto out; } for (l = group->children; l; l = l->next) { GstDecodeChain *chain = l->data; if (!gst_decode_chain_is_complete (chain)) { complete = FALSE; goto out; } } out: GST_DEBUG_OBJECT (group->dbin, "Group %p is complete: %d", group, complete); return complete; } /* gst_decode_chain_is_complete: * * Returns TRUE if the chain is complete, this means either * a) This chain is a dead end, i.e. we have no suitable plugins * b) This chain ends in an endpad and this is blocked or exposed * * Not MT-safe, always call with decodebin expose lock */ static gboolean gst_decode_chain_is_complete (GstDecodeChain * chain) { gboolean complete = FALSE; if (chain->deadend) { complete = TRUE; goto out; } if (chain->endpad && (chain->endpad->blocked || chain->endpad->exposed)) { complete = TRUE; goto out; } if (chain->demuxer) { if (chain->active_group && gst_decode_group_is_complete (chain->active_group)) { complete = TRUE; goto out; } } out: GST_DEBUG_OBJECT (chain->dbin, "Chain %p is complete: %d", chain, complete); return complete; } /* check if the group is drained, meaning all pads have seen an EOS * event. */ static void gst_decode_pad_handle_eos (GstDecodePad * pad) { GstDecodeChain *chain = pad->chain; GST_LOG_OBJECT (pad->dbin, "chain : %p, pad %p", chain, pad); pad->drained = TRUE; gst_decode_chain_handle_eos (chain); } /* gst_decode_chain_handle_eos: * * Checks if there are next groups in any parent chain * to which we can switch or if everything is drained. * * If there are groups to switch to, hide the current active * one and expose the new one. * * MT-safe, don't call with chain lock! */ static void gst_decode_chain_handle_eos (GstDecodeChain * eos_chain) { GstDecodeBin *dbin = eos_chain->dbin; GstDecodeGroup *group = eos_chain->parent; GstDecodeChain *chain = eos_chain; gboolean drained; g_return_if_fail (eos_chain->endpad); CHAIN_MUTEX_LOCK (chain); while ((group = chain->parent)) { CHAIN_MUTEX_UNLOCK (chain); chain = group->parent; CHAIN_MUTEX_LOCK (chain); if (gst_decode_group_is_drained (group)) { continue; } break; } drained = chain->active_group ? gst_decode_group_is_drained (chain->active_group) : TRUE; /* Now either group == NULL and chain == dbin->decode_chain * or chain is the lowest chain that has a non-drained group */ if (chain->active_group && drained && chain->next_groups) { GST_DEBUG_OBJECT (dbin, "Hiding current group %p", chain->active_group); gst_decode_group_hide (chain->active_group); chain->old_groups = g_list_prepend (chain->old_groups, chain->active_group); GST_DEBUG_OBJECT (dbin, "Switching to next group %p", chain->next_groups->data); chain->active_group = chain->next_groups->data; chain->next_groups = g_list_delete_link (chain->next_groups, chain->next_groups); CHAIN_MUTEX_UNLOCK (chain); EXPOSE_LOCK (dbin); if (gst_decode_chain_is_complete (dbin->decode_chain)) gst_decode_bin_expose (dbin); EXPOSE_UNLOCK (dbin); } else if (!chain->active_group || drained) { g_assert (chain == dbin->decode_chain); CHAIN_MUTEX_UNLOCK (chain); GST_LOG_OBJECT (dbin, "all groups drained, fire signal"); g_signal_emit (G_OBJECT (dbin), gst_decode_bin_signals[SIGNAL_DRAINED], 0, NULL); } else { CHAIN_MUTEX_UNLOCK (chain); GST_DEBUG_OBJECT (dbin, "Current active group in chain %p is not drained yet", chain); } } /* gst_decode_group_is_drained: * * Check is this group is drained and cache this result. * The group is drained if all child chains are drained. * * Not MT-safe, call with group->parent's lock */ static gboolean gst_decode_group_is_drained (GstDecodeGroup * group) { GList *l; gboolean drained = TRUE; if (group->drained) { drained = TRUE; goto out; } for (l = group->children; l; l = l->next) { GstDecodeChain *chain = l->data; CHAIN_MUTEX_LOCK (chain); if (!gst_decode_chain_is_drained (chain)) drained = FALSE; CHAIN_MUTEX_UNLOCK (chain); if (!drained) goto out; } group->drained = drained; out: GST_DEBUG_OBJECT (group->dbin, "Group %p is drained: %d", group, drained); return drained; } /* gst_decode_chain_is_drained: * * Check is the chain is drained, which means that * either * * a) it's endpad is drained * b) there are no pending pads, the active group is drained * and there are no next groups * * Not MT-safe, call with chain lock */ static gboolean gst_decode_chain_is_drained (GstDecodeChain * chain) { gboolean drained = FALSE; if (chain->endpad) { drained = chain->endpad->drained; goto out; } if (chain->pending_pads) { drained = FALSE; goto out; } if (chain->active_group && gst_decode_group_is_drained (chain->active_group) && !chain->next_groups) { drained = TRUE; goto out; } out: GST_DEBUG_OBJECT (chain->dbin, "Chain %p is drained: %d", chain, drained); return drained; } /* sort_end_pads: * GCompareFunc to use with lists of GstPad. * Sorts pads by mime type. * First video (raw, then non-raw), then audio (raw, then non-raw), * then others. * * Return: negative if ab */ static gint sort_end_pads (GstDecodePad * da, GstDecodePad * db) { gint va, vb; GstCaps *capsa, *capsb; GstStructure *sa, *sb; const gchar *namea, *nameb; capsa = gst_pad_get_caps (GST_PAD (da)); capsb = gst_pad_get_caps (GST_PAD (db)); sa = gst_caps_get_structure ((const GstCaps *) capsa, 0); sb = gst_caps_get_structure ((const GstCaps *) capsb, 0); namea = gst_structure_get_name (sa); nameb = gst_structure_get_name (sb); if (g_strrstr (namea, "video/x-raw-")) va = 0; else if (g_strrstr (namea, "video/")) va = 1; else if (g_strrstr (namea, "audio/x-raw")) va = 2; else if (g_strrstr (namea, "audio/")) va = 3; else va = 4; if (g_strrstr (nameb, "video/x-raw-")) vb = 0; else if (g_strrstr (nameb, "video/")) vb = 1; else if (g_strrstr (nameb, "audio/x-raw")) vb = 2; else if (g_strrstr (nameb, "audio/")) vb = 3; else vb = 4; gst_caps_unref (capsa); gst_caps_unref (capsb); return va - vb; } /* Must only be called if the toplevel chain is complete and blocked! */ /* Not MT-safe, call with decodebin expose lock! */ static gboolean gst_decode_bin_expose (GstDecodeBin * dbin) { GList *tmp, *endpads = NULL; gboolean already_exposed = TRUE; GST_DEBUG_OBJECT (dbin, "Exposing currently active chains/groups"); /* Get the pads that we're going to expose and mark things as exposed */ if (!gst_decode_chain_expose (dbin->decode_chain, &endpads)) { g_list_foreach (endpads, (GFunc) gst_object_unref, NULL); g_list_free (endpads); GST_ERROR_OBJECT (dbin, "Broken chain/group tree"); g_return_val_if_reached (FALSE); return FALSE; } if (endpads == NULL) { GST_WARNING_OBJECT (dbin, "No suitable plugins found"); GST_ELEMENT_ERROR (dbin, CORE, MISSING_PLUGIN, (NULL), ("no suitable plugins found")); return FALSE; } /* Check if this was called when everything was exposed already */ for (tmp = endpads; tmp && already_exposed; tmp = tmp->next) { GstDecodePad *dpad = tmp->data; already_exposed &= dpad->exposed; if (!already_exposed) break; } if (already_exposed) { GST_DEBUG_OBJECT (dbin, "Everything was exposed already!"); g_list_foreach (endpads, (GFunc) gst_object_unref, NULL); g_list_free (endpads); return TRUE; } /* Set all already exposed pads to blocked */ for (tmp = endpads; tmp; tmp = tmp->next) { GstDecodePad *dpad = tmp->data; if (dpad->exposed) gst_decode_pad_set_blocked (dpad, TRUE); } /* re-order pads : video, then audio, then others */ endpads = g_list_sort (endpads, (GCompareFunc) sort_end_pads); /* Expose pads */ for (tmp = endpads; tmp; tmp = tmp->next) { GstDecodePad *dpad = (GstDecodePad *) tmp->data; gchar *padname; /* 1. rewrite name */ padname = g_strdup_printf ("src%d", dbin->nbpads); dbin->nbpads++; GST_DEBUG_OBJECT (dbin, "About to expose dpad %s as %s", GST_OBJECT_NAME (dpad), padname); gst_object_set_name (GST_OBJECT (dpad), padname); g_free (padname); /* 2. activate and add */ if (!dpad->exposed && !gst_element_add_pad (GST_ELEMENT (dbin), GST_PAD (dpad))) { /* not really fatal, we can try to add the other pads */ g_warning ("error adding pad to decodebin2"); continue; } dpad->exposed = TRUE; /* 3. emit signal */ GST_DEBUG_OBJECT (dbin, "emitting new-decoded-pad"); g_signal_emit (G_OBJECT (dbin), gst_decode_bin_signals[SIGNAL_NEW_DECODED_PAD], 0, dpad, (tmp->next == NULL)); GST_DEBUG_OBJECT (dbin, "emitted new-decoded-pad"); } /* signal no-more-pads. This allows the application to hook stuff to the * exposed pads */ GST_LOG_OBJECT (dbin, "signalling no-more-pads"); gst_element_no_more_pads (GST_ELEMENT (dbin)); /* 4. Unblock internal pads. The application should have connected stuff now * so that streaming can continue. */ for (tmp = endpads; tmp; tmp = tmp->next) { GstDecodePad *dpad = (GstDecodePad *) tmp->data; GST_DEBUG_OBJECT (dpad, "unblocking"); gst_decode_pad_unblock (dpad); GST_DEBUG_OBJECT (dpad, "unblocked"); gst_object_unref (dpad); } g_list_free (endpads); do_async_done (dbin); GST_DEBUG_OBJECT (dbin, "Exposed everything"); return TRUE; } /* gst_decode_chain_expose: * * Check if the chain can be exposed and add all endpads * to the endpads list. * * Also update the active group's multiqueue to the * runtime limits. * * Not MT-safe, call with decodebin expose lock! * */ static gboolean gst_decode_chain_expose (GstDecodeChain * chain, GList ** endpads) { GstDecodeGroup *group; GList *l; if (chain->deadend) return TRUE; if (chain->endpad) { if (!chain->endpad->blocked && !chain->endpad->exposed) return FALSE; *endpads = g_list_prepend (*endpads, gst_object_ref (chain->endpad)); return TRUE; } group = chain->active_group; if (!group) return FALSE; if (!group->no_more_pads && !group->overrun) return FALSE; /* update runtime limits. At runtime, we try to keep the amount of buffers * in the queues as low as possible (but at least 5 buffers). */ g_object_set (G_OBJECT (group->multiqueue), "max-size-bytes", 2 * 1024 * 1024, "max-size-buffers", 5, NULL); /* we can now disconnect any overrun signal, which is used to expose the * group. */ if (group->overrunsig) { GST_LOG_OBJECT (group->dbin, "Disconnecting overrun"); g_signal_handler_disconnect (group->multiqueue, group->overrunsig); group->overrunsig = 0; } for (l = group->children; l; l = l->next) { GstDecodeChain *childchain = l->data; if (!gst_decode_chain_expose (childchain, endpads)) return FALSE; } return TRUE; } /************************* * GstDecodePad functions *************************/ static void gst_decode_pad_class_init (GstDecodePadClass * klass) { } static void gst_decode_pad_init (GstDecodePad * pad) { pad->chain = NULL; pad->blocked = FALSE; pad->exposed = FALSE; pad->drained = FALSE; gst_object_ref (pad); gst_object_sink (pad); } static void source_pad_blocked_cb (GstPad * pad, gboolean blocked, GstDecodePad * dpad) { GstDecodeChain *chain; GstDecodeBin *dbin; chain = dpad->chain; dbin = chain->dbin; GST_LOG_OBJECT (dpad, "blocked:%d, dpad->chain:%p", blocked, chain); dpad->blocked = blocked; if (dpad->blocked) { EXPOSE_LOCK (dbin); if (gst_decode_chain_is_complete (dbin->decode_chain)) { if (!gst_decode_bin_expose (dbin)) GST_WARNING_OBJECT (dbin, "Couldn't expose group"); } EXPOSE_UNLOCK (dbin); } } static gboolean source_pad_event_probe (GstPad * pad, GstEvent * event, GstDecodePad * dpad) { GST_LOG_OBJECT (pad, "%s dpad:%p", GST_EVENT_TYPE_NAME (event), dpad); if (GST_EVENT_TYPE (event) == GST_EVENT_EOS) { GST_DEBUG_OBJECT (pad, "we received EOS"); /* Check if all pads are drained. If there is a next group to expose, we * will remove the ghostpad of the current group first, which unlinks the * peer and so drops the EOS. */ gst_decode_pad_handle_eos (dpad); } /* never drop events */ return TRUE; } static void gst_decode_pad_set_blocked (GstDecodePad * dpad, gboolean blocked) { GstDecodeBin *dbin = dpad->dbin; GstPad *opad; DYN_LOCK (dbin); opad = gst_ghost_pad_get_target (GST_GHOST_PAD_CAST (dpad)); if (!opad) goto out; gst_pad_set_blocked_async_full (opad, blocked, (GstPadBlockCallback) source_pad_blocked_cb, gst_object_ref (dpad), (GDestroyNotify) gst_object_unref); if (blocked) { if (dbin->shutdown) { /* deactivate to force flushing state to prevent NOT_LINKED errors */ gst_pad_set_active (GST_PAD (dpad), FALSE); } else { gst_object_ref (dpad); dbin->blocked_pads = g_list_prepend (dbin->blocked_pads, dpad); } } else { GList *l; if ((l = g_list_find (dbin->blocked_pads, dpad))) { gst_object_unref (dpad); dbin->blocked_pads = g_list_delete_link (dbin->blocked_pads, l); } } gst_object_unref (opad); out: DYN_UNLOCK (dbin); } static void gst_decode_pad_add_drained_check (GstDecodePad * dpad) { gst_pad_add_event_probe (GST_PAD (dpad), G_CALLBACK (source_pad_event_probe), dpad); } static void gst_decode_pad_activate (GstDecodePad * dpad, GstDecodeChain * chain) { g_return_if_fail (chain != NULL); dpad->chain = chain; gst_pad_set_active (GST_PAD (dpad), TRUE); gst_decode_pad_set_blocked (dpad, TRUE); gst_decode_pad_add_drained_check (dpad); } static void gst_decode_pad_unblock (GstDecodePad * dpad) { gst_decode_pad_set_blocked (dpad, FALSE); } /*gst_decode_pad_new: * * Creates a new GstDecodePad for the given pad. */ static GstDecodePad * gst_decode_pad_new (GstDecodeBin * dbin, GstPad * pad, GstDecodeChain * chain) { GstDecodePad *dpad; dpad = g_object_new (GST_TYPE_DECODE_PAD, "direction", GST_PAD_DIRECTION (pad), NULL); gst_ghost_pad_construct (GST_GHOST_PAD (dpad)); gst_ghost_pad_set_target (GST_GHOST_PAD (dpad), pad); dpad->chain = chain; dpad->dbin = dbin; return dpad; } /***** * Element add/remove *****/ static void do_async_start (GstDecodeBin * dbin) { GstMessage *message; dbin->async_pending = TRUE; message = gst_message_new_async_start (GST_OBJECT_CAST (dbin), FALSE); parent_class->handle_message (GST_BIN_CAST (dbin), message); } static void do_async_done (GstDecodeBin * dbin) { GstMessage *message; if (dbin->async_pending) { message = gst_message_new_async_done (GST_OBJECT_CAST (dbin)); parent_class->handle_message (GST_BIN_CAST (dbin), message); dbin->async_pending = FALSE; } } /***** * convenience functions *****/ /* find_sink_pad * * Returns the first sink pad of the given element, or NULL if it doesn't have * any. */ static GstPad * find_sink_pad (GstElement * element) { GstIterator *it; GstPad *pad = NULL; gpointer point; it = gst_element_iterate_sink_pads (element); if ((gst_iterator_next (it, &point)) == GST_ITERATOR_OK) pad = (GstPad *) point; gst_iterator_free (it); return pad; } /* call with dyn_lock held */ static void unblock_pads (GstDecodeBin * dbin) { GList *tmp; for (tmp = dbin->blocked_pads; tmp; tmp = tmp->next) { GstDecodePad *dpad = (GstDecodePad *) tmp->data; GstPad *opad = gst_ghost_pad_get_target (GST_GHOST_PAD_CAST (dpad)); if (!opad) continue; GST_DEBUG_OBJECT (dpad, "unblocking"); gst_pad_set_blocked_async_full (opad, FALSE, (GstPadBlockCallback) source_pad_blocked_cb, gst_object_ref (dpad), (GDestroyNotify) gst_object_unref); /* make flushing, prevent NOT_LINKED */ GST_PAD_SET_FLUSHING (GST_PAD (dpad)); gst_object_unref (dpad); gst_object_unref (opad); GST_DEBUG_OBJECT (dpad, "unblocked"); } /* clear, no more blocked pads */ g_list_free (dbin->blocked_pads); dbin->blocked_pads = NULL; } static GstStateChangeReturn gst_decode_bin_change_state (GstElement * element, GstStateChange transition) { GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS; GstDecodeBin *dbin = GST_DECODE_BIN (element); switch (transition) { case GST_STATE_CHANGE_NULL_TO_READY: if (dbin->typefind == NULL) goto missing_typefind; break; case GST_STATE_CHANGE_READY_TO_PAUSED: DYN_LOCK (dbin); GST_LOG_OBJECT (dbin, "clearing shutdown flag"); dbin->shutdown = FALSE; DYN_UNLOCK (dbin); dbin->have_type = FALSE; ret = GST_STATE_CHANGE_ASYNC; do_async_start (dbin); break; case GST_STATE_CHANGE_PAUSED_TO_READY: DYN_LOCK (dbin); GST_LOG_OBJECT (dbin, "setting shutdown flag"); dbin->shutdown = TRUE; unblock_pads (dbin); DYN_UNLOCK (dbin); default: break; } { GstStateChangeReturn bret; bret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); if (G_UNLIKELY (bret == GST_STATE_CHANGE_FAILURE)) goto activate_failed; else if (G_UNLIKELY (bret == GST_STATE_CHANGE_NO_PREROLL)) { do_async_done (dbin); ret = bret; } } switch (transition) { case GST_STATE_CHANGE_PAUSED_TO_READY: do_async_done (dbin); if (dbin->decode_chain) { gst_decode_chain_free (dbin->decode_chain); dbin->decode_chain = NULL; } break; case GST_STATE_CHANGE_READY_TO_NULL: default: break; } return ret; /* ERRORS */ missing_typefind: { gst_element_post_message (element, gst_missing_element_message_new (element, "typefind")); GST_ELEMENT_ERROR (dbin, CORE, MISSING_PLUGIN, (NULL), ("no typefind!")); return GST_STATE_CHANGE_FAILURE; } activate_failed: { GST_DEBUG_OBJECT (element, "element failed to change states -- activation problem?"); return GST_STATE_CHANGE_FAILURE; } } gboolean gst_decode_bin_plugin_init (GstPlugin * plugin) { GST_DEBUG_CATEGORY_INIT (gst_decode_bin_debug, "decodebin2", 0, "decoder bin"); #ifdef ENABLE_NLS GST_DEBUG ("binding text domain %s to locale dir %s", GETTEXT_PACKAGE, LOCALEDIR); bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR); bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8"); #endif /* ENABLE_NLS */ return gst_element_register (plugin, "decodebin2", GST_RANK_NONE, GST_TYPE_DECODE_BIN); }