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gst-docs: add return value to appsink callback in tutorial and example code

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The "crude waveform generator" sample application in "Basic
tutorial 8: Short-cutting the pipeline" was lacking the return value
so it was only being invoked once.

https://bugzilla.gnome.org/show_bug.cgi?id=796476
This commit is contained in:
Jacques de Broin 2018-06-04 15:55:08 -04:00 committed by Sebastian Dröge
parent 9c322b734b
commit c25c296760
2 changed files with 8 additions and 4 deletions
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3
examples/tutorials/basic-tutorial-8.c
View file

@ -96,9 +96,10 @@ static GstFlowReturn new_sample (GstElement *sink, CustomData *data) {
/* The only thing we do in this example is print a * to indicate a received buffer */
g_print ("*");
gst_sample_unref (sample);
return GST_FLOW_OK;
}
return GST_FLOW_OK;
return GST_FLOW_ERROR;
}
/* This function is called when an error message is posted on the bus */

9
markdown/tutorials/basic/short-cutting-the-pipeline.md
View file

@ -114,7 +114,7 @@ typedef struct _CustomData {
} CustomData;
/* This method is called by the idle GSource in the mainloop, to feed CHUNK_SIZE bytes into appsrc.
* The ide handler is added to the mainloop when appsrc requests us to start sending data (need-data signal)
* The idle handler is added to the mainloop when appsrc requests us to start sending data (need-data signal)
* and is removed when appsrc has enough data (enough-data signal).
*/
static gboolean push_data (CustomData *data) {
@ -181,7 +181,7 @@ static void stop_feed (GstElement *source, CustomData *data) {
}
/* The appsink has received a buffer */
static void new_sample (GstElement *sink, CustomData *data) {
static GstFlowReturn new_sample (GstElement *sink, CustomData *data) {
GstSample *sample;
/* Retrieve the buffer */
@ -190,7 +190,10 @@ static void new_sample (GstElement *sink, CustomData *data) {
/* The only thing we do in this example is print a * to indicate a received buffer */
g_print ("*");
gst_sample_unref (sample);
return GST_FLOW_OK;
}
return GST_FLOW_ERROR;
}
/* This function is called when an error message is posted on the bus */
@ -234,7 +237,7 @@ int main(int argc, char *argv[]) {
data.video_queue = gst_element_factory_make ("queue", "video_queue");
data.audio_convert2 = gst_element_factory_make ("audioconvert", "audio_convert2");
data.visual = gst_element_factory_make ("wavescope", "visual");
data.video_convert = gst_element_factory_make ("videoconvert", "csp");
data.video_convert = gst_element_factory_make ("videoconvert", "video_convert");
data.video_sink = gst_element_factory_make ("autovideosink", "video_sink");
data.app_queue = gst_element_factory_make ("queue", "app_queue");
data.app_sink = gst_element_factory_make ("appsink", "app_sink");