On Wed, 2017-06-28 at 14:43 +0200, Victor Toso wrote:
> From: Victor Toso <me@xxxxxxxxxxxxxx>
>
> On GST_MESSAGE_STREAM_START our stream is about to start and it
> seems
> a good moment to debug GStreamer pipeline if requested.
>
So this is just for the debug purpose.
> That we can do with GST_DEBUG_BIN_TO_DOT_FILE() which iterates
> recursively in the whole pipeline and generates a dot file with all
> the information, the filename is 'spice-gtk-gst-pipeline-debug.dot'.
When streaming is enabled there is a lot of streams, but just one
file. I'd suggest to put the stream id to the file name.
Pavel
>
> One can generate png image out of this dot file with the command:
> dot -Tpng -oimage.png spice-gtk-gst-pipeline-debug.dot
>
> Not that GST_DEBUG_BIN_TO_DOT_FILE() will only work if Gstreamer was
> configured with --gst-enable-gst-debug and the environment variable
> GST_DEBUG_DUMP_DOT_DIR was properly set.
>
> Full example:
>
> 1) GST_DEBUG_DUMP_DOT_DIR=/tmp remote-viewer ...
> 2) dot -Tpng -oimage.png spice-gtk-gst-pipeline-debug.dot
>
> Signed-off-by: Victor Toso <victortoso@xxxxxxxxxx>
> Signed-off-by: Victor Toso <me@xxxxxxxxxxxxxx>
> ---
> src/channel-display-gst.c | 15 ++++++++++++++-
> 1 file changed, 14 insertions(+), 1 deletion(-)
>
> diff --git a/src/channel-display-gst.c b/src/channel-display-gst.c
> index df58de3..04710e8 100644
> --- a/src/channel-display-gst.c
> +++ b/src/channel-display-gst.c
> @@ -298,7 +298,8 @@ static gboolean handle_pipeline_message(GstBus
> *bus, GstMessage *msg, gpointer v
> {
> SpiceGstDecoder *decoder = video_decoder;
>
> - if (GST_MESSAGE_TYPE(msg) == GST_MESSAGE_ERROR) {
> + switch(GST_MESSAGE_TYPE(msg)) {
> + case GST_MESSAGE_ERROR: {
> GError *err = NULL;
> gchar *debug_info = NULL;
> gst_message_parse_error(msg, &err, &debug_info);
> @@ -312,6 +313,18 @@ static gboolean handle_pipeline_message(GstBus
> *bus, GstMessage *msg, gpointer v
>
> /* We won't be able to process any more frame anyway */
> free_pipeline(decoder);
> + break;
> + }
> + case GST_MESSAGE_STREAM_START:
> + GST_DEBUG_BIN_TO_DOT_FILE(GST_BIN(decoder->pipeline),
> + GST_DEBUG_GRAPH_SHOW_ALL
> + |
> GST_DEBUG_GRAPH_SHOW_FULL_PARAMS
> + | GST_DEBUG_GRAPH_SHOW_STATES,
> + "spice-gtk-gst-pipeline-debug");
> + break;
> + default:
> + /* not being handled */
> + break;
> }
> return TRUE;
> }
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