more zmqaudio debugging

lsldert/zmqaudio.cc

 //
 // zmqaudio.cc -- play audio samples received over zeromq sockets
-// Copyright (c) 2020 Günter Winau
+// Copyright (c) 2020 Günter Windau
 // based on the example in paex_sine.c
 //
 
@@ -65,6 +65,15 @@ int verbose = 1;
 const int nrbuffers = 5;
 zmq_audiobuffer *buffer[nrbuffers];
 
+PaError print_error(PaError e) {
+    if (e != paNoError)
+        Pa_Terminate();
+    fprintf(stderr, "An error occured while using the portaudio stream\n");
+    fprintf(stderr, "Error number: %d\n", e);
+    fprintf(stderr, "Error message: %s\n", Pa_GetErrorText(e));
+    return e;
+}
+
 zmq_audiobuffer::zmq_audiobuffer(std::uint32_t _fsamp, std::uint32_t _nsamp,
                                  std::uint32_t _nchan)
     : fsamp{_fsamp}, nsamp{_nsamp}, nchan{_nchan},
@@ -91,8 +100,9 @@ zmq_audiobuffer::zmq_audiobuffer(std::uint32_t _fsamp, std::uint32_t _nsamp,
                         paClipOff, /* we won't output out of range samples so
                                       don't bother clipping them */
                         zmq_audiobuffer::stream_callback, this);
-    if (err != paNoError)
-        return;
+    if (err != paNoError) {
+        print_error(err);
+    }
 }
 
 zmq_audiobuffer::~zmq_audiobuffer() {
@@ -128,6 +138,7 @@ int zmq_audiobuffer::stream_callback(
             ret = paComplete;
         }
     }
+    //std::cerr << "idata=" << data->idata << std::endl;
     return ret;
 }
 
@@ -146,12 +157,17 @@ int zmq_audiobuffer::play() {
     sprintf(message, "No Message");
     int err =
         Pa_SetStreamFinishedCallback(stream, &zmq_audiobuffer::stream_finished);
-    if (err != paNoError)
+    if (err != paNoError) {
+        print_error(err);
         return err;
+    }
 
     err = Pa_StartStream(stream);
-    if (err != paNoError)
+    if (err != paNoError) {
+        print_error(err);
         return err;
+    }
+    
     playing = true;
 
     // printf("Play for %d seconds.\n", NUM_SECONDS);
@@ -190,15 +206,20 @@ int zmq_audiobuffer::fill(zmq::message_t &msg) {
     return 0;
 }
 
-PaError print_error(PaError e) {
-    if (e != paNoError)
-        Pa_Terminate();
-    fprintf(stderr, "An error occured while using the portaudio stream\n");
-    fprintf(stderr, "Error number: %d\n", e);
-    fprintf(stderr, "Error message: %s\n", Pa_GetErrorText(e));
-    return e;
+void zmq_audiobuffer::dump(int nsamples)
+{
+    std::cerr << "in void zmq_audiobuffer::dump(int nsamples):" << std::endl;
+    std::cerr << "fsamp=" << fsamp << std::endl;
+    std::cerr << "nsamp=" << nsamp << std::endl;
+    std::cerr << "nchan=" << nchan << std::endl;
+    std::cerr << "frames_per_buffer=" << frames_per_buffer << std::endl;
+    std::cerr << "idata=" << idata << std::endl;
+    for (int i=0; i<nsamples; i++) {
+        std::cerr << "data[" << i << "]=" << data[i] << std::endl;
+    }
 }
 
+
 int zmq_recv_multi(zmq::socket_t &socket, zmq::message_t parts[], int nmax) {
     int64_t more;
     size_t more_size = sizeof more;
@@ -295,17 +316,27 @@ int main(void) {
                std::uint32_t nsamp = audio_header[2];
                buffer[ibuf] = new zmq_audiobuffer(Fs, nsamp, nchan);
                buffer[ibuf]->fill(msg[2]);
+               if (verbose)
+                  buffer[ibuf]->dump(50);
             }
             else
                buffer[ibuf]=nullptr;
         }
         else if (cmd == "AP") { // Play
-            if (buffer[ibuf])
-               buffer[ibuf]->play();
+            if (buffer[ibuf]) {
+               err=buffer[ibuf]->play();
+               if (err != paNoError) {
+                   print_error(err);
+                   return err;
+               }
+             }
         }
         else if (cmd == "AS") { // Stop
-            if (buffer[ibuf])
+            if (buffer[ibuf]) {
                buffer[ibuf]->stop();
+               if (verbose)
+                  buffer[ibuf]->dump(4);
+            }
         }
 
         delete[] audio_header;

lsldert/zmqaudio.h

@@ -27,6 +27,8 @@ class zmq_audiobuffer {
         return double(nsamp)/fsamp;
     }
 
+    void dump(int nsamples);
+
 protected:
     bool playing;
     PaStream *stream;