1 /* GStreamer

     2  * Copyright (C) <2007> Wim Taymans <wim.taymans@gmail.com>

     3  *

     4  * This library is free software; you can redistribute it and/or

     5  * modify it under the terms of the GNU Library General Public

     6  * License as published by the Free Software Foundation; either

     7  * version 2 of the License, or (at your option) any later version.

     8  *

     9  * This library is distributed in the hope that it will be useful,

    10  * but WITHOUT ANY WARRANTY; without even the implied warranty of

    11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    12  * Library General Public License for more details.

    13  *

    14  * You should have received a copy of the GNU Library General Public

    15  * License along with this library; if not, write to the

    16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,

    17  * Boston, MA 02111-1307, USA.

    18  */

    19 

    20 /**

    21  * SECTION:element-uridecodebin

    22  * @short_description: decoder for an uri

    23  *

    24  * Decodes data from a URI into raw media.

    25  */

    26 

    27 #ifdef HAVE_CONFIG_H

    28 #  include "config.h"

    29 #endif

    30 

    31 #include <string.h>

    32 

    33 #include <gst/gst.h>

    34 #include <gst/gst-i18n-plugin.h>

    35 

    36 #include "gstplay-marshal.h"

    37 #include "gstplay-enum.h"

    38 

    39 #ifdef __SYMBIAN32__

    40 #include <glib_global.h>

    41 #endif

    42 #define GST_TYPE_URI_DECODE_BIN \

    43   (gst_uri_decode_bin_get_type())

    44 #define GST_URI_DECODE_BIN(obj) \

    45   (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_URI_DECODE_BIN,GstURIDecodeBin))

    46 #define GST_URI_DECODE_BIN_CLASS(klass) \

    47   (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_URI_DECODE_BIN,GstURIDecodeBinClass))

    48 #define GST_IS_URI_DECODE_BIN(obj) \

    49   (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_URI_DECODE_BIN))

    50 #define GST_IS_URI_DECODE_BIN_CLASS(klass) \

    51   (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_URI_DECODE_BIN))

    52 

    53 typedef struct _GstURIDecodeBin GstURIDecodeBin;

    54 typedef struct _GstURIDecodeBinClass GstURIDecodeBinClass;

    55 

    56 struct _GstURIDecodeBin

    57 {

    58   GstBin parent_instance;

    59 

    60   gchar *uri;

    61   guint connection_speed;

    62   GstCaps *caps;

    63   gchar *encoding;

    64 

    65   gboolean is_stream;

    66   GstElement *source;

    67   GstElement *queue;

    68   GSList *decoders;

    69   GSList *srcpads;

    70   gint numpads;

    71 

    72   /* for dynamic sources */

    73   guint src_np_sig_id;          /* new-pad signal id */

    74   guint src_nmp_sig_id;         /* no-more-pads signal id */

    75   gint pending;

    76 };

    77 

    78 struct _GstURIDecodeBinClass

    79 {

    80   GstBinClass parent_class;

    81 

    82   /* signal fired when we found a pad that we cannot decode */

    83   void (*unknown_type) (GstElement * element, GstPad * pad, GstCaps * caps);

    84 

    85   /* signal fired to know if we continue trying to decode the given caps */

    86     gboolean (*autoplug_continue) (GstElement * element, GstPad * pad,

    87       GstCaps * caps);

    88   /* signal fired to get a list of factories to try to autoplug */

    89   GValueArray *(*autoplug_factories) (GstElement * element, GstPad * pad,

    90       GstCaps * caps);

    91   /* signal fired to select from the proposed list of factories */

    92     GstAutoplugSelectResult (*autoplug_select) (GstElement * element,

    93       GstPad * pad, GstCaps * caps, GValueArray * factories);

    94 

    95   /* emited when all data is decoded */

    96   void (*drained) (GstElement * element);

    97 };

    98 

    99 static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src%d",

   100     GST_PAD_SRC,

   101     GST_PAD_SOMETIMES,

   102     GST_STATIC_CAPS_ANY);

   103 

   104 GST_DEBUG_CATEGORY_STATIC (gst_uri_decode_bin_debug);

   105 #define GST_CAT_DEFAULT gst_uri_decode_bin_debug

   106 

   107 static const GstElementDetails gst_uri_decode_bin_details =

   108 GST_ELEMENT_DETAILS ("URI Decoder",

   109     "Generic/Bin/Decoder",

   110     "Autoplug and decode an URI to raw media",

   111     "Wim Taymans <wim.taymans@gmail.com>");

   112 

   113 /* signals */

   114 enum

   115 {

   116   SIGNAL_UNKNOWN_TYPE,

   117   SIGNAL_AUTOPLUG_CONTINUE,

   118   SIGNAL_AUTOPLUG_FACTORIES,

   119   SIGNAL_AUTOPLUG_SELECT,

   120   SIGNAL_DRAINED,

   121   LAST_SIGNAL

   122 };

   123 

   124 /* properties */

   125 #define DEFAULT_PROP_URI	    NULL

   126 #define DEFAULT_CONNECTION_SPEED    0

   127 #define DEFAULT_CAPS                NULL

   128 #define DEFAULT_SUBTITLE_ENCODING   NULL

   129 

   130 enum

   131 {

   132   PROP_0,

   133   PROP_URI,

   134   PROP_CONNECTION_SPEED,

   135   PROP_CAPS,

   136   PROP_SUBTITLE_ENCODING,

   137   PROP_LAST

   138 };

   139 

   140 static guint gst_uri_decode_bin_signals[LAST_SIGNAL] = { 0 };

   141 

   142 GST_BOILERPLATE (GstURIDecodeBin, gst_uri_decode_bin, GstBin, GST_TYPE_BIN);

   143 

   144 static void gst_uri_decode_bin_set_property (GObject * object, guint prop_id,

   145     const GValue * value, GParamSpec * pspec);

   146 static void gst_uri_decode_bin_get_property (GObject * object, guint prop_id,

   147     GValue * value, GParamSpec * pspec);

   148 static void gst_uri_decode_bin_finalize (GObject * obj);

   149 

   150 static void handle_message (GstBin * bin, GstMessage * msg);

   151 

   152 static gboolean gst_uri_decode_bin_query (GstElement * element,

   153     GstQuery * query);

   154 static GstStateChangeReturn gst_uri_decode_bin_change_state (GstElement *

   155     element, GstStateChange transition);

   156 

   157 static void

   158 gst_uri_decode_bin_base_init (gpointer g_class)

   159 {

   160   GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);

   161 

   162   gst_element_class_add_pad_template (gstelement_class,

   163       gst_static_pad_template_get (&srctemplate));

   164   gst_element_class_set_details (gstelement_class, &gst_uri_decode_bin_details);

   165 }

   166 

   167 static gboolean

   168 _gst_boolean_accumulator (GSignalInvocationHint * ihint,

   169     GValue * return_accu, const GValue * handler_return, gpointer dummy)

   170 {

   171   gboolean myboolean;

   172 

   173   myboolean = g_value_get_boolean (handler_return);

   174   if (!(ihint->run_type & G_SIGNAL_RUN_CLEANUP))

   175     g_value_set_boolean (return_accu, myboolean);

   176 

   177   /* stop emission if FALSE */

   178   return myboolean;

   179 }

   180 

   181 static gboolean

   182 _gst_array_accumulator (GSignalInvocationHint * ihint,

   183     GValue * return_accu, const GValue * handler_return, gpointer dummy)

   184 {

   185   gpointer array;

   186 

   187   array = g_value_get_boxed (handler_return);

   188   if (!(ihint->run_type & G_SIGNAL_RUN_CLEANUP))

   189     g_value_set_boxed (return_accu, array);

   190 

   191   return FALSE;

   192 }

   193 

   194 static gboolean

   195 _gst_select_accumulator (GSignalInvocationHint * ihint,

   196     GValue * return_accu, const GValue * handler_return, gpointer dummy)

   197 {

   198   GstAutoplugSelectResult res;

   199 

   200   res = g_value_get_enum (handler_return);

   201   if (!(ihint->run_type & G_SIGNAL_RUN_CLEANUP))

   202     g_value_set_enum (return_accu, res);

   203 

   204   return FALSE;

   205 }

   206 

   207 static gboolean

   208 gst_uri_decode_bin_autoplug_continue (GstElement * element, GstPad * pad,

   209     GstCaps * caps)

   210 {

   211   /* by default we always continue */

   212   return TRUE;

   213 }

   214 

   215 static void

   216 gst_uri_decode_bin_class_init (GstURIDecodeBinClass * klass)

   217 {

   218   GObjectClass *gobject_class;

   219   GstElementClass *gstelement_class;

   220   GstBinClass *gstbin_class;

   221 

   222   gobject_class = G_OBJECT_CLASS (klass);

   223   gstelement_class = GST_ELEMENT_CLASS (klass);

   224   gstbin_class = GST_BIN_CLASS (klass);

   225 

   226   gobject_class->set_property = gst_uri_decode_bin_set_property;

   227   gobject_class->get_property = gst_uri_decode_bin_get_property;

   228   gobject_class->finalize = gst_uri_decode_bin_finalize;

   229 

   230   g_object_class_install_property (gobject_class, PROP_URI,

   231       g_param_spec_string ("uri", "URI", "URI to decode",

   232           DEFAULT_PROP_URI, G_PARAM_READWRITE));

   233 

   234   g_object_class_install_property (gobject_class, PROP_CONNECTION_SPEED,

   235       g_param_spec_uint ("connection-speed", "Connection Speed",

   236           "Network connection speed in kbps (0 = unknown)",

   237           0, G_MAXUINT, DEFAULT_CONNECTION_SPEED, G_PARAM_READWRITE));

   238 

   239   g_object_class_install_property (gobject_class, PROP_CAPS,

   240       g_param_spec_boxed ("caps", "Caps",

   241           "The caps on which to stop decoding. (NULL = default)",

   242           GST_TYPE_CAPS, G_PARAM_READWRITE));

   243 

   244   g_object_class_install_property (gobject_class, PROP_SUBTITLE_ENCODING,

   245       g_param_spec_string ("subtitle-encoding", "subtitle encoding",

   246           "Encoding to assume if input subtitles are not in UTF-8 encoding. "

   247           "If not set, the GST_SUBTITLE_ENCODING environment variable will "

   248           "be checked for an encoding to use. If that is not set either, "

   249           "ISO-8859-15 will be assumed.", NULL, G_PARAM_READWRITE));

   250 

   251   /**

   252    * GstURIDecodeBin::unknown-type:

   253    * @pad: the new pad containing caps that cannot be resolved to a 'final' stream type.

   254    * @caps: the #GstCaps of the pad that cannot be resolved.

   255    *

   256    * This signal is emitted when a pad for which there is no further possible

   257    * decoding is added to the uridecodebin.

   258    */

   259   gst_uri_decode_bin_signals[SIGNAL_UNKNOWN_TYPE] =

   260       g_signal_new ("unknown-type", G_TYPE_FROM_CLASS (klass),

   261       G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstURIDecodeBinClass, unknown_type),

   262       NULL, NULL, gst_marshal_VOID__OBJECT_OBJECT, G_TYPE_NONE, 2,

   263       GST_TYPE_PAD, GST_TYPE_CAPS);

   264 

   265   /**

   266    * GstURIDecodeBin::autoplug-continue:

   267    * @pad: The #GstPad.

   268    * @caps: The #GstCaps found.

   269    *

   270    * This signal is emitted whenever uridecodebin finds a new stream. It is

   271    * emitted before looking for any elements that can handle that stream.

   272    *

   273    * Returns: #TRUE if you wish uridecodebin to look for elements that can

   274    * handle the given @caps. If #FALSE, those caps will be considered as

   275    * final and the pad will be exposed as such (see 'new-decoded-pad'

   276    * signal).

   277    */

   278   gst_uri_decode_bin_signals[SIGNAL_AUTOPLUG_CONTINUE] =

   279       g_signal_new ("autoplug-continue", G_TYPE_FROM_CLASS (klass),

   280       G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstURIDecodeBinClass,

   281           autoplug_continue), _gst_boolean_accumulator, NULL,

   282       gst_play_marshal_BOOLEAN__OBJECT_OBJECT, G_TYPE_BOOLEAN, 2, GST_TYPE_PAD,

   283       GST_TYPE_CAPS);

   284 

   285   /**

   286    * GstURIDecodeBin::autoplug-factories:

   287    * @pad: The #GstPad.

   288    * @caps: The #GstCaps found.

   289    *

   290    * This function is emited when an array of possible factories for @caps on

   291    * @pad is needed. Decodebin2 will by default return 

   292    *

   293    * Returns: a #GValueArray* with a list of factories to try. The factories are

   294    * by default tried in the returned order or based on the index returned by

   295    * "autoplug-select".

   296    */

   297   gst_uri_decode_bin_signals[SIGNAL_AUTOPLUG_FACTORIES] =

   298       g_signal_new ("autoplug-factories", G_TYPE_FROM_CLASS (klass),

   299       G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstURIDecodeBinClass,

   300           autoplug_factories), _gst_array_accumulator, NULL,

   301       gst_play_marshal_BOXED__OBJECT_OBJECT, G_TYPE_VALUE_ARRAY, 2,

   302       GST_TYPE_PAD, GST_TYPE_CAPS);

   303 

   304   /**

   305    * GstURIDecodeBin::autoplug-select:

   306    * @pad: The #GstPad.

   307    * @caps: The #GstCaps.

   308    * @factories: A #GValueArray of possible #GstElementFactory to use, sorted by

   309    * rank (higher ranks come first).

   310    *

   311    * This signal is emitted once uridecodebin has found all the possible

   312    * #GstElementFactory that can be used to handle the given @caps.

   313    *

   314    * Returns: A #gint indicating what factory index from the @factories array

   315    * that you wish uridecodebin to use for trying to decode the given @caps.

   316    * -1 to stop selection of a factory. The default handler always

   317    * returns the first possible factory.

   318    */

   319   gst_uri_decode_bin_signals[SIGNAL_AUTOPLUG_SELECT] =

   320       g_signal_new ("autoplug-select", G_TYPE_FROM_CLASS (klass),

   321       G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstURIDecodeBinClass,

   322           autoplug_select), _gst_select_accumulator, NULL,

   323       gst_play_marshal_ENUM__OBJECT_OBJECT_OBJECT,

   324       GST_TYPE_AUTOPLUG_SELECT_RESULT, 3, GST_TYPE_PAD, GST_TYPE_CAPS,

   325       GST_TYPE_ELEMENT_FACTORY);

   326 

   327   /**

   328    * GstURIDecodeBin::drained:

   329    *

   330    * This signal is emitted when the data for the current uri is played.

   331    */

   332   gst_uri_decode_bin_signals[SIGNAL_DRAINED] =

   333       g_signal_new ("drained", G_TYPE_FROM_CLASS (klass),

   334       G_SIGNAL_RUN_LAST,

   335       G_STRUCT_OFFSET (GstURIDecodeBinClass, drained), NULL, NULL,

   336       gst_marshal_VOID__VOID, G_TYPE_NONE, 0, G_TYPE_NONE);

   337 

   338   gstelement_class->query = GST_DEBUG_FUNCPTR (gst_uri_decode_bin_query);

   339   gstelement_class->change_state =

   340       GST_DEBUG_FUNCPTR (gst_uri_decode_bin_change_state);

   341 

   342   gstbin_class->handle_message = GST_DEBUG_FUNCPTR (handle_message);

   343 

   344   klass->autoplug_continue =

   345       GST_DEBUG_FUNCPTR (gst_uri_decode_bin_autoplug_continue);

   346 }

   347 

   348 static void

   349 gst_uri_decode_bin_init (GstURIDecodeBin * dec, GstURIDecodeBinClass * klass)

   350 {

   351   dec->uri = g_strdup (DEFAULT_PROP_URI);

   352   dec->connection_speed = DEFAULT_CONNECTION_SPEED;

   353   dec->caps = DEFAULT_CAPS;

   354   dec->encoding = g_strdup (DEFAULT_SUBTITLE_ENCODING);

   355 }

   356 

   357 static void

   358 gst_uri_decode_bin_finalize (GObject * obj)

   359 {

   360   GstURIDecodeBin *dec = GST_URI_DECODE_BIN (obj);

   361 

   362   g_free (dec->uri);

   363   g_free (dec->encoding);

   364 

   365   G_OBJECT_CLASS (parent_class)->finalize (obj);

   366 }

   367 

   368 static void

   369 gst_uri_decode_bin_set_property (GObject * object, guint prop_id,

   370     const GValue * value, GParamSpec * pspec)

   371 {

   372   GstURIDecodeBin *dec = GST_URI_DECODE_BIN (object);

   373 

   374   switch (prop_id) {

   375     case PROP_URI:

   376       GST_OBJECT_LOCK (dec);

   377       g_free (dec->uri);

   378       dec->uri = g_value_dup_string (value);

   379       GST_OBJECT_UNLOCK (dec);

   380       break;

   381     case PROP_CONNECTION_SPEED:

   382       GST_OBJECT_LOCK (dec);

   383       dec->connection_speed = g_value_get_uint (value) * 1000;

   384       GST_OBJECT_UNLOCK (dec);

   385       break;

   386     case PROP_CAPS:

   387       GST_OBJECT_LOCK (dec);

   388       if (dec->caps)

   389         gst_caps_unref (dec->caps);

   390       dec->caps = g_value_dup_boxed (value);

   391       GST_OBJECT_UNLOCK (dec);

   392       break;

   393     case PROP_SUBTITLE_ENCODING:

   394       GST_OBJECT_LOCK (dec);

   395       g_free (dec->encoding);

   396       dec->encoding = g_value_dup_string (value);

   397       GST_OBJECT_UNLOCK (dec);

   398       break;

   399     default:

   400       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);

   401       break;

   402   }

   403 }

   404 

   405 static void

   406 gst_uri_decode_bin_get_property (GObject * object, guint prop_id,

   407     GValue * value, GParamSpec * pspec)

   408 {

   409   GstURIDecodeBin *dec = GST_URI_DECODE_BIN (object);

   410 

   411   switch (prop_id) {

   412     case PROP_URI:

   413       GST_OBJECT_LOCK (dec);

   414       g_value_set_string (value, dec->uri);

   415       GST_OBJECT_UNLOCK (dec);

   416       break;

   417     case PROP_CONNECTION_SPEED:

   418       GST_OBJECT_LOCK (dec);

   419       g_value_set_uint (value, dec->connection_speed / 1000);

   420       GST_OBJECT_UNLOCK (dec);

   421       break;

   422     case PROP_CAPS:

   423       GST_OBJECT_LOCK (dec);

   424       g_value_set_boxed (value, dec->caps);

   425       GST_OBJECT_UNLOCK (dec);

   426       break;

   427     case PROP_SUBTITLE_ENCODING:

   428       GST_OBJECT_LOCK (dec);

   429       g_value_set_string (value, dec->encoding);

   430       GST_OBJECT_UNLOCK (dec);

   431       break;

   432     default:

   433       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);

   434       break;

   435   }

   436 }

   437 

   438 #define DEFAULT_QUEUE_SIZE          (3 * GST_SECOND)

   439 #define DEFAULT_QUEUE_MIN_THRESHOLD ((DEFAULT_QUEUE_SIZE * 30) / 100)

   440 #define DEFAULT_QUEUE_THRESHOLD     ((DEFAULT_QUEUE_SIZE * 95) / 100)

   441 

   442 static void

   443 unknown_type_cb (GstElement * element, GstPad * pad, GstCaps * caps,

   444     GstURIDecodeBin * decoder)

   445 {

   446   gchar *capsstr;

   447 

   448   capsstr = gst_caps_to_string (caps);

   449   GST_ELEMENT_WARNING (decoder, STREAM, WRONG_TYPE,

   450       (_("No decoder available for type \'%s\'."), capsstr), (NULL));

   451   g_free (capsstr);

   452 }

   453 

   454 /* add a streaminfo that indicates that the stream is handled by the

   455  * given element. This usually means that a stream without actual data is

   456  * produced but one that is sunken by an element. Examples of this are:

   457  * cdaudio, a hardware decoder/sink, dvd meta bins etc...

   458  */

   459 static void

   460 add_element_stream (GstElement * element, GstURIDecodeBin * decoder)

   461 {

   462   g_warning ("add element stream");

   463 }

   464 

   465 /* when the decoder element signals that no more pads will be generated, we

   466  * can commit the current group.

   467  */

   468 static void

   469 no_more_pads_full (GstElement * element, gboolean subs,

   470     GstURIDecodeBin * decoder)

   471 {

   472   gboolean final;

   473 

   474   /* setup phase */

   475   GST_DEBUG_OBJECT (element, "no more pads, %d pending", decoder->pending);

   476 

   477   GST_OBJECT_LOCK (decoder);

   478   final = (decoder->pending == 0);

   479 

   480   /* nothing pending, we can exit */

   481   if (final)

   482     goto done;

   483 

   484   /* the object has no pending no_more_pads */

   485   if (!g_object_get_data (G_OBJECT (element), "pending"))

   486     goto done;

   487   g_object_set_data (G_OBJECT (element), "pending", NULL);

   488 

   489   decoder->pending--;

   490   final = (decoder->pending == 0);

   491 

   492 done:

   493   GST_OBJECT_UNLOCK (decoder);

   494 

   495   if (final)

   496     gst_element_no_more_pads (GST_ELEMENT_CAST (decoder));

   497 

   498   return;

   499 }

   500 

   501 static void

   502 no_more_pads (GstElement * element, GstURIDecodeBin * decoder)

   503 {

   504   no_more_pads_full (element, FALSE, decoder);

   505 }

   506 

   507 static void

   508 source_no_more_pads (GstElement * element, GstURIDecodeBin * bin)

   509 {

   510   GST_DEBUG_OBJECT (bin, "No more pads in source element %s.",

   511       GST_ELEMENT_NAME (element));

   512 

   513   g_signal_handler_disconnect (G_OBJECT (element), bin->src_np_sig_id);

   514   bin->src_np_sig_id = 0;

   515   g_signal_handler_disconnect (G_OBJECT (element), bin->src_nmp_sig_id);

   516   bin->src_nmp_sig_id = 0;

   517 

   518   no_more_pads_full (element, FALSE, bin);

   519 }

   520 

   521 /* Called by the signal handlers when a decodebin has 

   522  * found a new raw pad.  

   523  */

   524 static void

   525 new_decoded_pad_cb (GstElement * element, GstPad * pad, gboolean last,

   526     GstURIDecodeBin * decoder)

   527 {

   528   GstPad *newpad;

   529   gchar *padname;

   530 

   531   GST_DEBUG_OBJECT (element, "new decoded pad, name: <%s>. Last: %d",

   532       GST_PAD_NAME (pad), last);

   533 

   534   GST_OBJECT_LOCK (decoder);

   535   padname = g_strdup_printf ("src%d", decoder->numpads);

   536   decoder->numpads++;

   537   GST_OBJECT_UNLOCK (decoder);

   538 

   539   newpad = gst_ghost_pad_new (padname, pad);

   540   g_free (padname);

   541 

   542   /* store ref to the ghostpad so we can remove it */

   543   g_object_set_data (G_OBJECT (pad), "uridecodebin.ghostpad", newpad);

   544 

   545   gst_pad_set_active (newpad, TRUE);

   546   gst_element_add_pad (GST_ELEMENT_CAST (decoder), newpad);

   547 }

   548 

   549 static void

   550 pad_removed_cb (GstElement * element, GstPad * pad, GstURIDecodeBin * decoder)

   551 {

   552   GstPad *ghost;

   553 

   554   GST_DEBUG_OBJECT (element, "pad removed name: <%s:%s>",

   555       GST_DEBUG_PAD_NAME (pad));

   556 

   557   if (!(ghost = g_object_get_data (G_OBJECT (pad), "uridecodebin.ghostpad")))

   558     goto no_ghost;

   559 

   560   /* unghost the pad */

   561   gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (ghost), NULL);

   562 

   563   /* deactivate and remove */

   564   gst_pad_set_active (pad, FALSE);

   565   gst_element_remove_pad (GST_ELEMENT_CAST (decoder), ghost);

   566 

   567   return;

   568 

   569   /* ERRORS */

   570 no_ghost:

   571   {

   572     GST_WARNING_OBJECT (element, "no ghost pad found");

   573     return;

   574   }

   575 }

   576 

   577 /* helper function to lookup stuff in lists */

   578 static gboolean

   579 array_has_value (const gchar * values[], const gchar * value)

   580 {

   581   gint i;

   582 

   583   for (i = 0; values[i]; i++) {

   584     if (g_str_has_prefix (value, values[i]))

   585       return TRUE;

   586   }

   587   return FALSE;

   588 }

   589 

   590 /* list of URIs that we consider to be streams and that need buffering.

   591  * We have no mechanism yet to figure this out with a query. */

   592 static const gchar *stream_uris[] = { "http://", "mms://", "mmsh://",

   593   "mmsu://", "mmst://", NULL

   594 };

   595 

   596 /* blacklisted URIs, we know they will always fail. */

   597 static const gchar *blacklisted_uris[] = { NULL };

   598 

   599 /* mime types that we don't consider to be media types */

   600 #if 0

   601 static const gchar *no_media_mimes[] = {

   602   "application/x-executable", "application/x-bzip", "application/x-gzip",

   603   "application/zip", "application/x-compress", NULL

   604 };

   605 #endif

   606 

   607 /* mime types we consider raw media */

   608 static const gchar *raw_mimes[] = {

   609   "audio/x-raw", "video/x-raw", NULL

   610 };

   611 

   612 #define IS_STREAM_URI(uri)          (array_has_value (stream_uris, uri))

   613 #define IS_BLACKLISTED_URI(uri)     (array_has_value (blacklisted_uris, uri))

   614 #define IS_NO_MEDIA_MIME(mime)      (array_has_value (no_media_mimes, mime))

   615 #define IS_RAW_MIME(mime)           (array_has_value (raw_mimes, mime))

   616 

   617 /*

   618  * Generate and configure a source element.

   619  */

   620 static GstElement *

   621 gen_source_element (GstURIDecodeBin * decoder)

   622 {

   623   GstElement *source;

   624 

   625   if (!decoder->uri)

   626     goto no_uri;

   627 

   628   if (!gst_uri_is_valid (decoder->uri))

   629     goto invalid_uri;

   630 

   631   if (IS_BLACKLISTED_URI (decoder->uri))

   632     goto uri_blacklisted;

   633 

   634   source = gst_element_make_from_uri (GST_URI_SRC, decoder->uri, "source");

   635   if (!source)

   636     goto no_source;

   637 

   638   decoder->is_stream = IS_STREAM_URI (decoder->uri);

   639 

   640   /* make HTTP sources send extra headers so we get icecast

   641    * metadata in case the stream is an icecast stream */

   642   if (!strncmp (decoder->uri, "http://", 7) &&

   643       g_object_class_find_property (G_OBJECT_GET_CLASS (source),

   644           "iradio-mode")) {

   645     g_object_set (source, "iradio-mode", TRUE, NULL);

   646   }

   647 

   648   if (g_object_class_find_property (G_OBJECT_GET_CLASS (source),

   649           "connection-speed")) {

   650     GST_DEBUG_OBJECT (decoder,

   651         "setting connection-speed=%d to source element",

   652         decoder->connection_speed / 1000);

   653     g_object_set (source, "connection-speed",

   654         decoder->connection_speed / 1000, NULL);

   655   }

   656 

   657   return source;

   658 

   659   /* ERRORS */

   660 no_uri:

   661   {

   662     GST_ELEMENT_ERROR (decoder, RESOURCE, NOT_FOUND,

   663         (_("No URI specified to play from.")), (NULL));

   664     return NULL;

   665   }

   666 invalid_uri:

   667   {

   668     GST_ELEMENT_ERROR (decoder, RESOURCE, NOT_FOUND,

   669         (_("Invalid URI \"%s\"."), decoder->uri), (NULL));

   670     return NULL;

   671   }

   672 uri_blacklisted:

   673   {

   674     GST_ELEMENT_ERROR (decoder, RESOURCE, FAILED,

   675         (_("This stream type cannot be played yet.")), (NULL));

   676     return NULL;

   677   }

   678 no_source:

   679   {

   680     gchar *prot = gst_uri_get_protocol (decoder->uri);

   681 

   682     /* whoops, could not create the source element, dig a little deeper to

   683      * figure out what might be wrong. */

   684     if (prot) {

   685       GST_ELEMENT_ERROR (decoder, RESOURCE, FAILED,

   686           (_("No URI handler implemented for \"%s\"."), prot), (NULL));

   687       g_free (prot);

   688     } else

   689       goto invalid_uri;

   690 

   691     return NULL;

   692   }

   693 }

   694 

   695 /**

   696  * has_all_raw_caps:

   697  * @pad: a #GstPad

   698  * @all_raw: pointer to hold the result

   699  *

   700  * check if the caps of the pad are all raw. The caps are all raw if

   701  * all of its structures contain audio/x-raw or video/x-raw.

   702  *

   703  * Returns: %FALSE @pad has no caps. Else TRUE and @all_raw set t the result.

   704  */

   705 static gboolean

   706 has_all_raw_caps (GstPad * pad, gboolean * all_raw)

   707 {

   708   GstCaps *caps;

   709   gint capssize;

   710   guint i, num_raw = 0;

   711   gboolean res = FALSE;

   712 

   713   caps = gst_pad_get_caps (pad);

   714   if (caps == NULL)

   715     return FALSE;

   716 

   717   capssize = gst_caps_get_size (caps);

   718   /* no caps, skip and move to the next pad */

   719   if (capssize == 0 || gst_caps_is_empty (caps) || gst_caps_is_any (caps))

   720     goto done;

   721 

   722   /* count the number of raw formats in the caps */

   723   for (i = 0; i < capssize; ++i) {

   724     GstStructure *s;

   725     const gchar *mime_type;

   726 

   727     s = gst_caps_get_structure (caps, i);

   728     mime_type = gst_structure_get_name (s);

   729 

   730     if (IS_RAW_MIME (mime_type))

   731       ++num_raw;

   732   }

   733 

   734   *all_raw = (num_raw == capssize);

   735   res = TRUE;

   736 

   737 done:

   738   gst_caps_unref (caps);

   739   return res;

   740 }

   741 

   742 /**

   743  * analyse_source:

   744  * @decoder: a #GstURIDecodeBin

   745  * @is_raw: are all pads raw data

   746  * @have_out: does the source have output

   747  * @is_dynamic: is this a dynamic source

   748  *

   749  * Check the source of @decoder and collect information about it.

   750  *

   751  * @is_raw will be set to TRUE if the source only produces raw pads. When this

   752  * function returns, all of the raw pad of the source will be added

   753  * to @decoder.

   754  *

   755  * @have_out: will be set to TRUE if the source has output pads.

   756  *

   757  * @is_dynamic: TRUE if the element will create (more) pads dynamically later

   758  * on.

   759  *

   760  * Returns: FALSE if a fatal error occured while scanning.

   761  */

   762 static gboolean

   763 analyse_source (GstURIDecodeBin * decoder, gboolean * is_raw,

   764     gboolean * have_out, gboolean * is_dynamic)

   765 {

   766   GstIterator *pads_iter;

   767   gboolean done = FALSE;

   768   gboolean res = TRUE;

   769 

   770   *have_out = FALSE;

   771   *is_raw = FALSE;

   772   *is_dynamic = FALSE;

   773 

   774   pads_iter = gst_element_iterate_src_pads (decoder->source);

   775   while (!done) {

   776     GstPad *pad;

   777 

   778     switch (gst_iterator_next (pads_iter, (gpointer) & pad)) {

   779       case GST_ITERATOR_ERROR:

   780         res = FALSE;

   781         /* FALLTROUGH */

   782       case GST_ITERATOR_DONE:

   783         done = TRUE;

   784         break;

   785       case GST_ITERATOR_RESYNC:

   786         /* reset results and resync */

   787         *have_out = FALSE;

   788         *is_raw = FALSE;

   789         *is_dynamic = FALSE;

   790         gst_iterator_resync (pads_iter);

   791         break;

   792       case GST_ITERATOR_OK:

   793         /* we now officially have an ouput pad */

   794         *have_out = TRUE;

   795 

   796         /* if FALSE, this pad has no caps and we continue with the next pad. */

   797         if (!has_all_raw_caps (pad, is_raw))

   798           break;

   799 

   800         /* caps on source pad are all raw, we can add the pad */

   801         if (*is_raw)

   802           new_decoded_pad_cb (decoder->source, pad, FALSE, decoder);

   803         break;

   804     }

   805   }

   806   gst_iterator_free (pads_iter);

   807 

   808   if (!*have_out) {

   809     GstElementClass *elemclass;

   810     GList *walk;

   811 

   812     /* element has no output pads, check for padtemplates that list SOMETIMES

   813      * pads. */

   814     elemclass = GST_ELEMENT_GET_CLASS (decoder->source);

   815 

   816     walk = gst_element_class_get_pad_template_list (elemclass);

   817     while (walk != NULL) {

   818       GstPadTemplate *templ;

   819 

   820       templ = (GstPadTemplate *) walk->data;

   821       if (GST_PAD_TEMPLATE_DIRECTION (templ) == GST_PAD_SRC) {

   822         if (GST_PAD_TEMPLATE_PRESENCE (templ) == GST_PAD_SOMETIMES)

   823           *is_dynamic = TRUE;

   824         break;

   825       }

   826       walk = g_list_next (walk);

   827     }

   828   }

   829 

   830   return res;

   831 }

   832 

   833 static void

   834 remove_decoders (GstURIDecodeBin * bin)

   835 {

   836   GSList *walk;

   837 

   838   for (walk = bin->decoders; walk; walk = g_slist_next (walk)) {

   839     GstElement *decoder = GST_ELEMENT_CAST (walk->data);

   840 

   841     GST_DEBUG_OBJECT (bin, "removing old decoder element");

   842     gst_element_set_state (decoder, GST_STATE_NULL);

   843     gst_bin_remove (GST_BIN_CAST (bin), decoder);

   844   }

   845   g_slist_free (bin->decoders);

   846   bin->decoders = NULL;

   847 }

   848 

   849 static void

   850 remove_pads (GstURIDecodeBin * bin)

   851 {

   852   GSList *walk;

   853 

   854   for (walk = bin->srcpads; walk; walk = g_slist_next (walk)) {

   855     GstPad *pad = GST_PAD_CAST (walk->data);

   856 

   857     GST_DEBUG_OBJECT (bin, "removing old pad");

   858     gst_pad_set_active (pad, FALSE);

   859     gst_element_remove_pad (GST_ELEMENT_CAST (bin), pad);

   860   }

   861   g_slist_free (bin->srcpads);

   862   bin->srcpads = NULL;

   863 }

   864 

   865 static void

   866 proxy_unknown_type_signal (GstElement * element, GstPad * pad, GstCaps * caps,

   867     GstURIDecodeBin * dec)

   868 {

   869   GST_DEBUG_OBJECT (dec, "unknown-type signaled");

   870 

   871   g_signal_emit (G_OBJECT (dec),

   872       gst_uri_decode_bin_signals[SIGNAL_UNKNOWN_TYPE], 0, pad, caps);

   873 }

   874 

   875 static gboolean

   876 proxy_autoplug_continue_signal (GstElement * element, GstPad * pad,

   877     GstCaps * caps, GstURIDecodeBin * dec)

   878 {

   879   gboolean result;

   880 

   881   g_signal_emit (G_OBJECT (dec),

   882       gst_uri_decode_bin_signals[SIGNAL_AUTOPLUG_CONTINUE], 0, pad, caps,

   883       &result);

   884 

   885   GST_DEBUG_OBJECT (dec, "autoplug-continue returned %d", result);

   886 

   887   return result;

   888 }

   889 

   890 static GValueArray *

   891 proxy_autoplug_factories_signal (GstElement * element, GstPad * pad,

   892     GstCaps * caps, GstURIDecodeBin * dec)

   893 {

   894   GValueArray *result = NULL;

   895 

   896   g_signal_emit (G_OBJECT (dec),

   897       gst_uri_decode_bin_signals[SIGNAL_AUTOPLUG_FACTORIES], 0, pad, caps,

   898       &result);

   899 

   900   GST_DEBUG_OBJECT (dec, "autoplug-factories returned %p", result);

   901 

   902   return result;

   903 }

   904 

   905 static GstAutoplugSelectResult

   906 proxy_autoplug_select_signal (GstElement * element, GstPad * pad,

   907     GstCaps * caps, GstElementFactory * factory, GstURIDecodeBin * dec)

   908 {

   909   GstAutoplugSelectResult result;

   910 

   911   g_signal_emit (G_OBJECT (dec),

   912       gst_uri_decode_bin_signals[SIGNAL_AUTOPLUG_SELECT], 0, pad, caps, factory,

   913       &result);

   914 

   915   GST_DEBUG_OBJECT (dec, "autoplug-select returned %d", result);

   916 

   917   return result;

   918 }

   919 

   920 static void

   921 proxy_drained_signal (GstElement * element, GstURIDecodeBin * dec)

   922 {

   923   GST_DEBUG_OBJECT (dec, "drained signaled");

   924 

   925   g_signal_emit (G_OBJECT (dec),

   926       gst_uri_decode_bin_signals[SIGNAL_DRAINED], 0, NULL);

   927 }

   928 

   929 static GstElement *

   930 make_decoder (GstURIDecodeBin * decoder, gboolean use_queue)

   931 {

   932   GstElement *result, *decodebin;

   933 

   934   /* now create the decoder element */

   935   decodebin = gst_element_factory_make ("decodebin2", NULL);

   936   if (!decodebin)

   937     goto no_decodebin;

   938 

   939   /* connect signals to proxy */

   940   g_signal_connect (G_OBJECT (decodebin), "unknown-type",

   941       G_CALLBACK (proxy_unknown_type_signal), decoder);

   942   g_signal_connect (G_OBJECT (decodebin), "autoplug-continue",

   943       G_CALLBACK (proxy_autoplug_continue_signal), decoder);

   944   g_signal_connect (G_OBJECT (decodebin), "autoplug-factories",

   945       G_CALLBACK (proxy_autoplug_factories_signal), decoder);

   946   g_signal_connect (G_OBJECT (decodebin), "autoplug-select",

   947       G_CALLBACK (proxy_autoplug_select_signal), decoder);

   948   g_signal_connect (G_OBJECT (decodebin), "drained",

   949       G_CALLBACK (proxy_drained_signal), decoder);

   950 

   951   if (use_queue) {

   952     GstElement *queue;

   953     GstPad *gpad, *pad;

   954 

   955     queue = gst_element_factory_make ("queue2", NULL);

   956     if (!queue)

   957       goto no_queue2;

   958 

   959     /* configure the queue as a buffering element */

   960     g_object_set (G_OBJECT (queue), "use-buffering", TRUE, NULL);

   961 

   962     result = gst_bin_new ("source-bin");

   963 

   964     gst_bin_add (GST_BIN_CAST (result), queue);

   965     gst_bin_add (GST_BIN_CAST (result), decodebin);

   966 

   967     gst_element_link (queue, decodebin);

   968 

   969     pad = gst_element_get_pad (queue, "sink");

   970     gpad = gst_ghost_pad_new (GST_PAD_NAME (pad), pad);

   971     gst_object_unref (pad);

   972 

   973     gst_pad_set_active (gpad, TRUE);

   974     gst_element_add_pad (GST_ELEMENT_CAST (result), gpad);

   975   } else {

   976     result = decodebin;

   977   }

   978 

   979   /* set up callbacks to create the links between decoded data

   980    * and video/audio/subtitle rendering/output. */

   981   g_signal_connect (G_OBJECT (decodebin),

   982       "new-decoded-pad", G_CALLBACK (new_decoded_pad_cb), decoder);

   983   g_signal_connect (G_OBJECT (decodebin),

   984       "pad-removed", G_CALLBACK (pad_removed_cb), decoder);

   985   g_signal_connect (G_OBJECT (decodebin), "no-more-pads",

   986       G_CALLBACK (no_more_pads), decoder);

   987   g_signal_connect (G_OBJECT (decodebin),

   988       "unknown-type", G_CALLBACK (unknown_type_cb), decoder);

   989   g_object_set_data (G_OBJECT (decodebin), "pending", "1");

   990   decoder->pending++;

   991 

   992   gst_bin_add (GST_BIN_CAST (decoder), result);

   993 

   994   decoder->decoders = g_slist_prepend (decoder->decoders, result);

   995 

   996   return result;

   997 

   998   /* ERRORS */

   999 no_decodebin:

  1000   {

  1001     GST_ELEMENT_ERROR (decoder, CORE, MISSING_PLUGIN,

  1002         (_("Could not create \"decodebin2\" element.")), (NULL));

  1003     return NULL;

  1004   }

  1005 no_queue2:

  1006   {

  1007     GST_ELEMENT_ERROR (decoder, CORE, MISSING_PLUGIN,

  1008         (_("Could not create \"queue2\" element.")), (NULL));

  1009     return NULL;

  1010   }

  1011 }

  1012 

  1013 static void

  1014 remove_source (GstURIDecodeBin * bin)

  1015 {

  1016   GstElement *source = bin->source;

  1017 

  1018   if (source) {

  1019     GST_DEBUG_OBJECT (bin, "removing old src element");

  1020     gst_element_set_state (source, GST_STATE_NULL);

  1021     gst_bin_remove (GST_BIN_CAST (bin), source);

  1022 

  1023     if (bin->src_np_sig_id) {

  1024       g_signal_handler_disconnect (G_OBJECT (source), bin->src_np_sig_id);

  1025       bin->src_np_sig_id = 0;

  1026     }

  1027     if (bin->src_nmp_sig_id) {

  1028       g_signal_handler_disconnect (G_OBJECT (source), bin->src_nmp_sig_id);

  1029       bin->src_nmp_sig_id = 0;

  1030     }

  1031     bin->source = NULL;

  1032   }

  1033 }

  1034 

  1035 /* is called when a dynamic source element created a new pad. */

  1036 static void

  1037 source_new_pad (GstElement * element, GstPad * pad, GstURIDecodeBin * bin)

  1038 {

  1039   GstElement *decoder;

  1040   gboolean is_raw;

  1041 

  1042   GST_DEBUG_OBJECT (bin, "Found new pad %s.%s in source element %s",

  1043       GST_DEBUG_PAD_NAME (pad), GST_ELEMENT_NAME (element));

  1044 

  1045   /* if this is a pad with all raw caps, we can expose it */

  1046   if (has_all_raw_caps (pad, &is_raw) && is_raw) {

  1047     /* it's all raw, create output pads. */

  1048     new_decoded_pad_cb (element, pad, FALSE, bin);

  1049     return;

  1050   }

  1051 

  1052   /* not raw, create decoder */

  1053   decoder = make_decoder (bin, FALSE);

  1054   if (!decoder)

  1055     goto no_decodebin;

  1056 

  1057   /* and link to decoder */

  1058   if (!gst_element_link (bin->source, decoder))

  1059     goto could_not_link;

  1060 

  1061   GST_DEBUG_OBJECT (bin, "linked decoder to new pad");

  1062 

  1063   gst_element_set_state (decoder, GST_STATE_PLAYING);

  1064 

  1065   return;

  1066 

  1067   /* ERRORS */

  1068 no_decodebin:

  1069   {

  1070     /* error was posted */

  1071     return;

  1072   }

  1073 could_not_link:

  1074   {

  1075     GST_ELEMENT_ERROR (bin, CORE, NEGOTIATION,

  1076         (NULL), ("Can't link source to decoder element"));

  1077     return;

  1078   }

  1079 }

  1080 

  1081 /* construct and run the source and decoder elements until we found

  1082  * all the streams or until a preroll queue has been filled.

  1083 */

  1084 static gboolean

  1085 setup_source (GstURIDecodeBin * decoder)

  1086 {

  1087   gboolean is_raw, have_out, is_dynamic;

  1088 

  1089   GST_DEBUG_OBJECT (decoder, "setup source");

  1090 

  1091   /* delete old src */

  1092   remove_source (decoder);

  1093 

  1094   /* create and configure an element that can handle the uri */

  1095   if (!(decoder->source = gen_source_element (decoder)))

  1096     goto no_source;

  1097 

  1098   /* state will be merged later - if file is not found, error will be

  1099    * handled by the application right after. */

  1100   gst_bin_add (GST_BIN_CAST (decoder), decoder->source);

  1101 

  1102   /* remove the old decoders now, if any */

  1103   remove_decoders (decoder);

  1104 

  1105   /* see if the source element emits raw audio/video all by itself,

  1106    * if so, we can create streams for the pads and be done with it.

  1107    * Also check that is has source pads, if not, we assume it will

  1108    * do everything itself.  */

  1109   if (!analyse_source (decoder, &is_raw, &have_out, &is_dynamic))

  1110     goto invalid_source;

  1111 

  1112   if (is_raw) {

  1113     GST_DEBUG_OBJECT (decoder, "Source provides all raw data");

  1114     /* source provides raw data, we added the pads and we can now signal a

  1115      * no_more pads because we are done. */

  1116     /* FIXME, actually do this... */

  1117     return TRUE;

  1118   }

  1119   if (!have_out && !is_dynamic) {

  1120     GST_DEBUG_OBJECT (decoder, "Source has no output pads");

  1121     /* create a stream to indicate that this uri is handled by a self

  1122      * contained element. We are now done. */

  1123     add_element_stream (decoder->source, decoder);

  1124     return TRUE;

  1125   }

  1126   if (is_dynamic) {

  1127     GST_DEBUG_OBJECT (decoder, "Source has dynamic output pads");

  1128     /* connect a handler for the new-pad signal */

  1129     decoder->src_np_sig_id =

  1130         g_signal_connect (G_OBJECT (decoder->source), "pad-added",

  1131         G_CALLBACK (source_new_pad), decoder);

  1132     decoder->src_nmp_sig_id =

  1133         g_signal_connect (G_OBJECT (decoder->source), "no-more-pads",

  1134         G_CALLBACK (source_no_more_pads), decoder);