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add error handling

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Original commit message from CVS:
add error handling
This commit is contained in:
Thomas Vander Stichele 2004-01-31 15:56:32 +00:00
parent 15e4076c3d
commit 8f703c9192
4 changed files with 150 additions and 94 deletions
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11
ChangeLog
View file

@ -1,3 +1,14 @@
2004-01-31 Thomas Vander Stichele <thomas at apestaart dot org>
* gst-libs/gst/play/play.c: (gst_play_error_quark),
(gst_play_error_create), (gst_play_error_plugin),
(gst_play_pipeline_setup), (gst_play_init), (gst_play_new):
* gst-libs/gst/play/play.h:
add error handling during creation
* examples/gstplay/player.c: (main):
use new gst_play_new
2004-01-31 Benjamin Otte <in7y118@public.uni-hamburg.de>
* ext/theora/theoradec.c: (theora_dec_chain):

9
examples/gstplay/player.c
View file

@ -99,6 +99,7 @@ main (int argc, char *argv[])
{
GstPlay *play;
GstElement *data_src, *video_sink, *audio_sink, *vis_element;
GError *error;
/* Initing GStreamer library */
gst_init (&argc, &argv);
@ -111,7 +112,13 @@ main (int argc, char *argv[])
loop = g_main_loop_new (NULL, FALSE);
/* Creating the GstPlay object */
play = gst_play_new ();
play = gst_play_new (&error);
if (error)
{
g_print ("Error: could not create play object:\n%s\n", error->message);
g_error_free (error);
return 1;
}
/* Getting default audio and video plugins from GConf */
audio_sink = gst_element_factory_make ("osssink", "audio_sink");

215
gst-libs/gst/play/play.c
View file

@ -46,6 +46,10 @@ struct _GstPlayPrivate {
guint length_id;
gulong handoff_hid;
/* error/debug handling */
GError *error;
gchar *debug;
};
static guint gst_play_signals[LAST_SIGNAL] = { 0 };
@ -58,8 +62,64 @@ static GstPipelineClass *parent_class = NULL;
/* */
/* ======================================================= */
static GQuark
gst_play_error_quark (void)
{
static GQuark quark = 0;
if (quark == 0)
quark = g_quark_from_static_string ("gst-play-error-quark");
return quark;
}
/* General GError creation */
static void
gst_play_error_create (GError ** error, const gchar *message)
{
/* check if caller wanted an error reported */
if (error == NULL)
return;
*error = g_error_new (GST_PLAY_ERROR, 0, message);
return;
}
/* GError creation when plugin is missing */
/* FIXME: what if multiple elements could have been used and they're all
* missing ? varargs ? */
static void
gst_play_error_plugin (const gchar *element, GError ** error)
{
gchar *message;
message = g_strdup_printf ("The %s element could not be found. "
"This element is essential for playback. "
"Please install the right plug-in and verify "
"that it works by running 'gst-inspect %s'",
element, element);
gst_play_error_create (error, message);
g_free (message);
return;
}
#define GST_PLAY_MAKE_OR_ERROR(el, factory, name, error) \
G_STMT_START { \
el = gst_element_factory_make (factory, name); \
if (!GST_IS_ELEMENT (el)) \
{ \
gst_play_error_plugin (factory, error); \
return FALSE; \
} \
} G_STMT_END
#define GST_PLAY_ERROR_RETURN(error, message) \
G_STMT_START { \
gst_play_error_create (error, message); \
return FALSE; \
} G_STMT_END
static gboolean
gst_play_pipeline_setup (GstPlay *play)
gst_play_pipeline_setup (GstPlay *play, GError **error)
{
/* Threads */
GstElement *work_thread, *audio_thread, *video_thread;
@ -81,47 +141,29 @@ gst_play_pipeline_setup (GstPlay *play)
/* Creating main thread and its elements */
{
work_thread = gst_element_factory_make ("thread", "work_thread");
if (!GST_IS_ELEMENT (work_thread))
return FALSE;
GST_PLAY_MAKE_OR_ERROR (work_thread, "thread", "work_thread", error);
g_hash_table_insert (play->priv->elements, "work_thread", work_thread);
gst_bin_add (GST_BIN (play), work_thread);
/* Placeholder for datasrc */
source = gst_element_factory_make ("fakesrc", "source");
if (!GST_IS_ELEMENT (source))
return FALSE;
GST_PLAY_MAKE_OR_ERROR (source, "fakesrc", "source", error);
g_hash_table_insert (play->priv->elements, "source", source);
/* Autoplugger */
autoplugger = gst_element_factory_make ("spider", "autoplugger");
if (!GST_IS_ELEMENT (autoplugger))
return FALSE;
GST_PLAY_MAKE_OR_ERROR (autoplugger, "spider", "autoplugger", error);
g_hash_table_insert (play->priv->elements, "autoplugger", autoplugger);
/* Make sure we convert audio to the needed format */
audioconvert = gst_element_factory_make ("audioconvert",
"audioconvert");
if (!GST_IS_ELEMENT (audioconvert))
return FALSE;
GST_PLAY_MAKE_OR_ERROR (audioconvert, "audioconvert", "audioconvert", error);
/* FIXME: why are volume and audioconvert switched around for the insert ) */
g_hash_table_insert (play->priv->elements, "volume", audioconvert);
/* Volume control */
volume = gst_element_factory_make ("volume", "volume");
if (!GST_IS_ELEMENT (volume))
return FALSE;
GST_PLAY_MAKE_OR_ERROR (volume, "volume", "volume", error);
g_hash_table_insert (play->priv->elements, "audioconvert", volume);
/* Duplicate audio signal to audio sink and visualization thread */
tee = gst_element_factory_make ("tee", "tee");
if (!GST_IS_ELEMENT (tee))
return FALSE;
GST_PLAY_MAKE_OR_ERROR (tee, "tee", "tee", error);
tee_pad1 = gst_element_get_request_pad (tee, "src%d");
tee_pad2 = gst_element_get_request_pad (tee, "src%d");
g_hash_table_insert (play->priv->elements, "tee_pad1", tee_pad1);
@ -130,48 +172,45 @@ gst_play_pipeline_setup (GstPlay *play)
gst_bin_add_many (GST_BIN (work_thread), source, autoplugger,/* audioconvert,*/
volume, tee, NULL);
gst_element_link_many (source, autoplugger,/* audioconvert,*/ volume, tee, NULL);
if (!gst_element_link_many (source, autoplugger,/* audioconvert,*/ volume, tee, NULL))
GST_PLAY_ERROR_RETURN (error, "Could not link source thread elements");
/* identity ! colorspace ! switch */
identity = gst_element_factory_make ("identity", "identity");
if (!GST_IS_ELEMENT (identity))
return FALSE;
GST_PLAY_MAKE_OR_ERROR (identity, "identity", "identity", error);
g_hash_table_insert (play->priv->elements, "identity", identity);
identity_cs = gst_element_factory_make ("ffcolorspace", "identity_cs");
if (!GST_IS_ELEMENT (identity_cs)) {
identity_cs = gst_element_factory_make ("colorspace", "identity_cs");
if (!GST_IS_ELEMENT (identity_cs))
{
gst_play_error_plugin ("colorspace", error);
return FALSE;
}
}
g_hash_table_insert (play->priv->elements, "identity_cs", identity_cs);
gst_bin_add_many (GST_BIN (work_thread), identity, identity_cs, NULL);
gst_element_link_many (autoplugger, identity, identity_cs, NULL);
if (!gst_element_link_many (autoplugger, identity, identity_cs, NULL))
GST_PLAY_ERROR_RETURN (error, "Could not link work thread elements");
}
/* Visualization bin (note: it s not added to the pipeline yet) */
{
vis_bin = gst_bin_new ("vis_bin");
if (!GST_IS_ELEMENT (vis_bin))
{
gst_play_error_plugin ("bin", error);
return FALSE;
}
g_hash_table_insert (play->priv->elements, "vis_bin", vis_bin);
/* Buffer queue for video data */
vis_queue = gst_element_factory_make ("queue", "vis_queue");
if (!GST_IS_ELEMENT (vis_queue))
return FALSE;
GST_PLAY_MAKE_OR_ERROR (vis_queue, "queue", "vis_queue", error);
g_hash_table_insert (play->priv->elements, "vis_queue", vis_queue);
/* Visualization element placeholder */
vis_element = gst_element_factory_make ("identity", "vis_element");
if (!GST_IS_ELEMENT (vis_element))
return FALSE;
GST_PLAY_MAKE_OR_ERROR (vis_element, "identity", "vis_element", error);
g_hash_table_insert (play->priv->elements, "vis_element", vis_element);
/* Colorspace conversion */
@ -179,36 +218,31 @@ gst_play_pipeline_setup (GstPlay *play)
if (!GST_IS_ELEMENT (vis_cs)) {
vis_cs = gst_element_factory_make ("colorspace", "vis_cs");
if (!GST_IS_ELEMENT (vis_cs))
{
gst_play_error_plugin ("colorspace", error);
return FALSE;
}
}
g_hash_table_insert (play->priv->elements, "vis_cs", vis_cs);
gst_bin_add_many (GST_BIN (vis_bin), vis_queue, vis_element, vis_cs, NULL);
gst_element_link_many (vis_queue, vis_element, vis_cs, NULL);
if (!gst_element_link_many (vis_queue, vis_element, vis_cs, NULL))
GST_PLAY_ERROR_RETURN (error, "Could not link visualisation thread elements");
gst_element_add_ghost_pad (vis_bin,
gst_element_get_pad (vis_cs, "src"), "src");
}
/* Creating our video output bin */
{
video_thread = gst_element_factory_make ("thread", "video_thread");
if (!GST_IS_ELEMENT (video_thread))
return FALSE;
GST_PLAY_MAKE_OR_ERROR (video_thread, "thread", "video_thread", error);
g_hash_table_insert (play->priv->elements, "video_thread", video_thread);
gst_bin_add (GST_BIN (work_thread), video_thread);
/* Buffer queue for video data */
video_queue = gst_element_factory_make ("queue", "video_queue");
if (!GST_IS_ELEMENT (video_queue))
return FALSE;
GST_PLAY_MAKE_OR_ERROR (video_queue, "queue", "video_queue", error);
g_hash_table_insert (play->priv->elements, "video_queue", video_queue);
video_switch = gst_element_factory_make ("switch", "video_switch");
if (!GST_IS_ELEMENT (video_switch))
return FALSE;
GST_PLAY_MAKE_OR_ERROR (video_switch, "switch", "video_switch", error);
g_hash_table_insert (play->priv->elements, "video_switch", video_switch);
/* Colorspace conversion */
@ -216,79 +250,67 @@ gst_play_pipeline_setup (GstPlay *play)
if (!GST_IS_ELEMENT (video_cs)) {
video_cs = gst_element_factory_make ("colorspace", "video_cs");
if (!GST_IS_ELEMENT (video_cs))
{
gst_play_error_plugin ("colorspace", error);
return FALSE;
}
}
g_hash_table_insert (play->priv->elements, "video_cs", video_cs);
/* Software colorbalance */
video_balance = gst_element_factory_make ("videobalance",
"video_balance");
if (!GST_IS_ELEMENT (video_balance))
return FALSE;
g_hash_table_insert (play->priv->elements, "video_balance",
video_balance);
GST_PLAY_MAKE_OR_ERROR (video_balance, "videobalance", "video_balance", error);
g_hash_table_insert (play->priv->elements, "video_balance", video_balance);
/* Colorspace conversion */
balance_cs = gst_element_factory_make ("ffcolorspace", "balance_cs");
if (!GST_IS_ELEMENT (balance_cs)) {
balance_cs = gst_element_factory_make ("colorspace", "balance_cs");
if (!GST_IS_ELEMENT (balance_cs))
{
gst_play_error_plugin ("colorspace", error);
return FALSE;
}
}
g_hash_table_insert (play->priv->elements, "balance_cs", balance_cs);
/* Software scaling of video stream */
video_scaler = gst_element_factory_make ("videoscale", "video_scaler");
if (!GST_IS_ELEMENT (video_scaler))
return FALSE;
GST_PLAY_MAKE_OR_ERROR (video_scaler, "videoscale", "video_scaler", error);
g_hash_table_insert (play->priv->elements, "video_scaler", video_scaler);
/* Placeholder for future video sink bin */
video_sink = gst_element_factory_make ("fakesink", "video_sink");
if (!GST_IS_ELEMENT (video_sink))
return FALSE;
GST_PLAY_MAKE_OR_ERROR (video_sink, "fakesink", "video_sink", error);
g_hash_table_insert (play->priv->elements, "video_sink", video_sink);
gst_bin_add_many (GST_BIN (video_thread), video_queue, video_switch, video_cs,
video_balance, balance_cs, video_scaler, video_sink, NULL);
gst_element_link_many (video_queue, video_switch, video_cs, video_balance,
balance_cs, video_scaler, video_sink, NULL);
if (!gst_element_link_many (video_queue, video_switch, video_cs,
video_balance, balance_cs, video_scaler,
video_sink, NULL))
GST_PLAY_ERROR_RETURN (error, "Could not link video output thread elements");
gst_element_add_ghost_pad (video_thread,
gst_element_get_pad (video_queue, "sink"),
"sink");
gst_element_link (identity_cs, video_thread);
if (!gst_element_link (identity_cs, video_thread))
GST_PLAY_ERROR_RETURN (error, "Could not link video output thread elements");
}
/* Creating our audio output bin
{ queue ! fakesink } */
{
audio_thread = gst_element_factory_make ("thread", "audio_thread");
if (!GST_IS_ELEMENT (audio_thread))
return FALSE;
GST_PLAY_MAKE_OR_ERROR (audio_thread, "thread", "audio_thread", error);
g_hash_table_insert (play->priv->elements, "audio_thread", audio_thread);
gst_bin_add (GST_BIN (work_thread), audio_thread);
/* Buffer queue for our audio thread */
audio_queue = gst_element_factory_make ("queue", "audio_queue");
if (!GST_IS_ELEMENT (audio_queue))
return FALSE;
GST_PLAY_MAKE_OR_ERROR (audio_queue, "queue", "audio_queue", error);
g_hash_table_insert (play->priv->elements, "audio_queue", audio_queue);
/* Placeholder for future audio sink bin */
audio_sink = gst_element_factory_make ("fakesink", "audio_sink");
if (!GST_IS_ELEMENT (audio_sink))
return FALSE;
GST_PLAY_MAKE_OR_ERROR (audio_sink, "fakesink", "audio_sink", error);
g_hash_table_insert (play->priv->elements, "audio_sink", audio_sink);
gst_bin_add_many (GST_BIN (audio_thread), audio_queue, audio_sink, NULL);
gst_element_link (audio_queue, audio_sink);
if (!gst_element_link (audio_queue, audio_sink))
GST_PLAY_ERROR_RETURN (error, "Could not link audio output thread elements");
gst_element_add_ghost_pad (audio_thread,
gst_element_get_pad (audio_queue, "sink"),
"sink");
@ -486,9 +508,14 @@ gst_play_init (GstPlay *play)
play->priv->length_nanos = 0;
play->priv->time_nanos = 0;
play->priv->elements = g_hash_table_new (g_str_hash, g_str_equal);
play->priv->error = NULL;
play->priv->debug = NULL;
if (!gst_play_pipeline_setup (play))
g_warning ("libgstplay: failed initializing pipeline");
if (!gst_play_pipeline_setup (play, &play->priv->error))
{
g_warning ("libgstplay: failed initializing pipeline, error: %s",
play->priv->error->message);
}
}
static void
@ -1094,9 +1121,15 @@ gst_play_get_sink_element (GstPlay *play,
}
GstPlay *
gst_play_new (void)
gst_play_new (GError **error)
{
GstPlay *play = g_object_new (GST_TYPE_PLAY, NULL);
if (play->priv->error)
{
*error = play->priv->error;
play->priv->error = NULL;
}
return play;
}

9
gst-libs/gst/play/play.h
View file

@ -23,6 +23,11 @@
#include <gst/gst.h>
#include <gst/xoverlay/xoverlay.h>
/* GError stuff */
#define GST_PLAY_ERROR gst_play_error_quark ()
/* GObject stuff */
#define GST_TYPE_PLAY (gst_play_get_type())
#define GST_PLAY(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_PLAY, GstPlay))
#define GST_PLAY_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_PLAY, GstPlayClass))
@ -62,7 +67,7 @@ struct _GstPlayClass
};
GType gst_play_get_type (void);
GstPlay * gst_play_new (void);
GstPlay * gst_play_new (GError **error);
gboolean gst_play_set_data_src (GstPlay *play,
GstElement *data_src);
@ -82,7 +87,7 @@ char * gst_play_get_location (GstPlay *play);
gboolean gst_play_seek_to_time (GstPlay *play,
gint64 time_nanos);
GstElement * gst_play_get_sink_element (GstPlay *play,
GstElement *element,
GstPlaySinkType sink_type);