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Add gstreamer source element

Browse source 
Add a source gstreamer element
Expose error in context
Make it possible to set the source in the error state
Add properties to a stream and use those to get a source-output
Fix signal for new-buffer
Attach the socket source to the thread default mainloop
Make subscribe cancellable.
Propagate state and error in context.
Add bus handler for v4l2 source
Use negotiated properties to set capsfilter in v4l2
Fix subscribe in test-client
This commit is contained in:
Wim Taymans 2015-04-28 17:36:44 +02:00
parent e151150cad
commit 592e99a317
14 changed files with 934 additions and 38 deletions
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72
src/modules/v4l2/pv-v4l2-source.c
View file

@ -29,6 +29,7 @@ struct _PvV4l2SourcePrivate
{
GstElement *pipeline;
GstElement *src;
GstElement *filter;
GstElement *sink;
GSocket *socket;
@ -36,13 +37,40 @@ struct _PvV4l2SourcePrivate
G_DEFINE_TYPE (PvV4l2Source, pv_v4l2_source, PV_TYPE_SOURCE);
static gboolean
bus_handler (GstBus * bus, GstMessage * message, gpointer user_data)
{
PvSource *source = user_data;
PvV4l2SourcePrivate *priv = PV_V4L2_SOURCE (source)->priv;
switch (GST_MESSAGE_TYPE (message)) {
case GST_MESSAGE_ERROR:
{
GError *error;
gchar *debug;
gst_message_parse_error (message, &error, &debug);
g_print ("got error %s (%s)\n", error->message, debug);
g_free (debug);
pv_source_report_error (source, error);
gst_element_set_state (priv->pipeline, GST_STATE_NULL);
break;
}
default:
break;
}
return TRUE;
}
static void
setup_pipeline (PvV4l2Source *source)
{
PvV4l2SourcePrivate *priv = source->priv;
GstBus *bus;
priv->pipeline = gst_parse_launch ("v4l2src name=src ! "
"video/x-raw,width=640,height=480,framerate=30/1 ! "
"capsfilter name=filter ! "
"pvfdpay ! "
"multisocketsink "
"buffers-max=2 "
@ -53,8 +81,13 @@ setup_pipeline (PvV4l2Source *source)
"sync=true "
"enable-last-sample=false",
NULL);
priv->filter = gst_bin_get_by_name (GST_BIN (priv->pipeline), "filter");
priv->sink = gst_bin_get_by_name (GST_BIN (priv->pipeline), "sink");
priv->src = gst_bin_get_by_name (GST_BIN (priv->pipeline), "src");
bus = gst_pipeline_get_bus (GST_PIPELINE (priv->pipeline));
gst_bus_add_watch (bus, bus_handler, source);
gst_object_unref (bus);
}
static void
@ -140,6 +173,36 @@ v4l2_create_source_output (PvSource *source, GVariant *props, const gchar *prefi
{
PvV4l2SourcePrivate *priv = PV_V4L2_SOURCE (source)->priv;
PvSourceOutput *output;
GVariantDict dict;
GstCaps *caps;
const gchar *str;
gint32 i32;
g_variant_dict_init (&dict, props);
if (!g_variant_dict_lookup (&dict, "format.encoding", "&s", &str))
goto invalid_encoding;
caps = gst_caps_new_empty_simple (str);
if (g_variant_dict_lookup (&dict, "format.format", "&s", &str))
gst_caps_set_simple (caps, "format", G_TYPE_STRING, str, NULL);
if (g_variant_dict_lookup (&dict, "format.width", "i", &i32))
gst_caps_set_simple (caps, "width", G_TYPE_INT, (gint) i32, NULL);
if (g_variant_dict_lookup (&dict, "format.height", "i", &i32))
gst_caps_set_simple (caps, "height", G_TYPE_INT, (gint) i32, NULL);
if (g_variant_dict_lookup (&dict, "format.views", "i", &i32))
gst_caps_set_simple (caps, "views", G_TYPE_INT, (gint) i32, NULL);
if (g_variant_dict_lookup (&dict, "format.chroma-site", "&s", &str))
gst_caps_set_simple (caps, "chroma-site", G_TYPE_STRING, str, NULL);
if (g_variant_dict_lookup (&dict, "format.colorimetry", "&s", &str))
gst_caps_set_simple (caps, "colorimetry", G_TYPE_STRING, str, NULL);
if (g_variant_dict_lookup (&dict, "format.interlace-mode", "&s", &str))
gst_caps_set_simple (caps, "interlace-mode", G_TYPE_STRING, str, NULL);
g_print ("caps %s\n", gst_caps_to_string (caps));
g_object_set (priv->filter, "caps", caps, NULL);
gst_caps_unref (caps);
output = PV_SOURCE_CLASS (pv_v4l2_source_parent_class)->create_source_output (source, props, prefix);
@ -148,6 +211,13 @@ v4l2_create_source_output (PvSource *source, GVariant *props, const gchar *prefi
g_signal_connect (output, "notify::socket", (GCallback) on_socket_notify, source);
return output;
/* ERRORS */
invalid_encoding:
{
g_variant_dict_clear (&dict);
return NULL;
}
}
static gboolean