mpegtsmux: add support for adding/removing streams at runtime

Submitted by Andreas Schuler

Description

When mpegtsmux is in PLAYING oder PAUSED state, I can add sink-pads, but when I activate it and put data in, I get the Error:

Stream on pad sink_xxx is not associated with any program.

With this patch, a new pad is added to the default, when it is not associated with any program. So it's possible to simply add streams during state PLAYING and PAUSED.

diff --git a/gst/mpegtsmux/mpegtsmux.c b/gst/mpegtsmux/mpegtsmux.c
index 975c926..6df698d 100644
--- a/gst/mpegtsmux/mpegtsmux.c
+++ b/gst/mpegtsmux/mpegtsmux.c
@@ -1117,6 +1117,25 @@ mpegtsmux_collected_buffer (GstCollectPads * pads, GstCollectData * data,
return GST_FLOW_OK;
}

if((best->prog) == NULL) {
GST_WARNING_OBJECT (mux, "Stream on pad %"

 GST_PTR_FORMAT " was not associated with any program, adding to default program",

```
 COLLECT_DATA_PAD (best));  
```
best->prog_id = DEFAULT_PROG_ID;
best->prog = mux->programs[best->prog_id];
if(best->stream == NULL) {

 ret = mpegtsmux_create_stream (mux, best);

```
 if (ret != GST_FLOW_OK) {  
```

     GST_ELEMENT_ERROR (mux, STREAM, MUX, ("Stream on pad %"

       GST_PTR_FORMAT " is not associated with any program",

       COLLECT_DATA_PAD (best)),(NULL));

```
     return GST_FLOW_ERROR;  
```
```
 }  
```
}
}
prog = best->prog;
if (prog == NULL)
goto no_program;