Festival C++ API and pthread()

transmogrifox · 10-21-2010, 09:13 PM

Hi all. I am attempting to write a program using Festival as the TTS output. It is a weather system, so
1) takes raw data from sensors on the input.
2) converts it into a text message
3) let festival take the message and turn it into audio that I can then route out to the telephone system.

Here is my main block of code using festival:

Code:

void *process(void* buf)
{
      char *message;
      message = (char *) buf;
      printf("%s", message);
     
     EST_String words = message;
   printf("it's called here \n");
   
  for(int i = 0; i<20; i++) {  
       printf("%s\n", message); 
   festival_say_text(words);
   usleep(900000);
   printf("finished festival\n\n");
   }

If in the main calling function I call it directly:

Code:

process(buf)

It works as expected.

However, if I try to put it into another thread:

Code:

pthread_create( &process1, NULL, process, (void*) sbuf);

I get the following output:

Code:

SIOD ERROR: the currently assigned stack limit has been exceded

which is coming from the function

Code:

festival_say_text(words);

I imagine some of my problem is being a C/C++ newbie, but is there anybody out there able to give me some hints? Maybe there is a different or better way to fork that process.

My plan is to keep updating the buffer whose pointer is passed to the function process() with my serial port processing program in the main loop. I can protect it with a mutex during the festival_say_text() function, but otherwise it will be accessible. If there are other ways to fork a process than pthread, then also those types of hints may help too.

Thanks in advance.

transmogrifox · 10-22-2010, 11:40 AM

For those interested in my problem here is what I did wrong:

The festival engine is initialized by the following code:

Code:

void init_process()
{
     printf("process initialization...\n");
    int heap_size = 210000;  // default scheme heap size
    int load_init_files = 1; // we want the festival init files loaded
    festival_initialize(load_init_files,heap_size);    
    printf("process initialized \n");
}

I discovered that needs to be called within the same thread, like this:

Code:

void *process(void* buf)
{
      init_process();
      char *message;
      message = (char *) buf;
      printf("%s", message);
     
     EST_String words = message;
   printf("it's called here \n");
   
  for(int i = 0; i<20; i++) {  
       printf("%s\n", message); 
   festival_say_text(words);
   usleep(900000);
   printf("finished festival\n\n");
   }

}

I had been calling it from the main program prior to sending it off into a thread.

Of course, the printf() statements, for loop and usleep() are all just debugging code

My for loop will turn into a while loop that will go on indefinitely.

I hope this is of some value to somebody else.

bb_ · 03-16-2020, 07:36 PM

thanks for leaving this description; i've hit the same problem (many years later)