GStreamer 1.0 - cannot play audio: Error: The stream is in the wrong format - c++

Question

I made a .pcm audio file via the following command:
gst-launch-1.0 filesrc location=/home/pi/rawaudio/can-you-keep-a-secret.wav ! wavparse ! audioresample ! audioconvert ! audio/x-raw,format=S16BE,channels=1,rate=44100,layout=interleaved ! filesink location=/home/pi/rawaudio/test.pcm
I can play it with:
gst-launch-1.0 filesrc location=/home/pi/rawaudio/test.pcm ! audio/x-raw,format=S16BE,channels=1,rate=44100,layout=interleaved ! audioconvert ! audioresample ! alsasink
This is working perfectly. But now, I need to implement this into my c++ application. This is what I already have:
#include <string>
#include <stdio.h>
#include <gst/gst.h>
#include <gio/gio.h>
#include <boost/thread.hpp>
#define AUDIO_LOCATION "/home/pi/rawaudio/test.pcm"
static gboolean bus_call(GstBus *bus,
GstMessage *msg,
gpointer data) {
GMainLoop *loop = (GMainLoop*)data;
switch (GST_MESSAGE_TYPE(msg)) {
case GST_MESSAGE_EOS:
g_print ("End of stream\n");
g_main_loop_quit(loop);
break;
case GST_MESSAGE_ERROR: {
gchar *debug;
GError *error;
gst_message_parse_error(msg, &error, &debug);
g_free (debug);
g_printerr("Error: %s\n", error->message);
g_error_free(error);
g_main_loop_quit(loop);
break;
}
default:
break;
}
return true;
}
int main (int argc, char **argv) {
gst_init(&argc, &argv);
GstElement *pipeline, *source, *parser, *sink, *convert;
GMainLoop *loop;
GstBus *bus;
guint bus_watch_id;
// loop
loop = g_main_loop_new(NULL, false);
// pipeline
pipeline = gst_pipeline_new("test_pipeline");
sink = gst_element_factory_make ("alsasink", "sink");
source = gst_element_factory_make("filesrc", "source");
g_object_set(G_OBJECT(source), "location", AUDIO_LOCATION, NULL);
//convert = gst_element_factory_make("audioconvert", "convert");
//parser = gst_element_factory_make("audioresample","parse");
GstPad *sourcepad, *sinkpad;
sourcepad = gst_element_get_static_pad(source, "src");
gst_pad_set_caps(sourcepad,
gst_caps_new_simple("audio/x-raw",
"rate", G_TYPE_INT, 44100,
"channels", G_TYPE_INT, 1,
"format", G_TYPE_STRING, "S16BE",
"layout", G_TYPE_STRING, "interleaved",
NULL));
gst_object_unref(sourcepad);
// bus
bus = gst_pipeline_get_bus(GST_PIPELINE (pipeline));
bus_watch_id = gst_bus_add_watch(bus, bus_call, loop);
gst_object_unref(bus);
// add elements into pipeline
gst_bin_add_many(GST_BIN(pipeline), source, sink, NULL);
// link source to decode
gst_element_link_many(source, sink, NULL);
// start playing
gst_element_set_state(GST_ELEMENT(pipeline), GST_STATE_PLAYING);
// iterate
g_print("Running...\n");
g_main_loop_run(loop);
// out of the main loop, clean up nicely
g_print("Returned, stopping playback\n");
gst_element_set_state(pipeline, GST_STATE_NULL);
g_print("Deleting pipeline\n");
gst_object_unref(GST_OBJECT(pipeline));
g_source_remove (bus_watch_id);
g_main_loop_unref(loop);
return 0;
}
But it is not working. I get
Error: The stream is in the wrong format
when running.
What am I missing? some elements like audioparse, audioconvert, audioresample ... I also tried inserting the audioconvert and audioresample after the source into the pipeline but then I get an internal data stream error exception.