Add stdout audio for Windows

src/audio_win.c

@@ -134,7 +134,7 @@ static int calcbufsize(int rate, int chans, int bits)
 static struct adev_s {
 
 	enum audio_in_type_e g_audio_in_type;
-
+	enum audio_out_type_e g_audio_out_type;
 /*
  * UDP socket for receiving audio stream.
  * Buffer, length, and pointer for UDP or stdin.
@@ -146,6 +146,12 @@ static struct adev_s {
 	int stream_len;
 	int stream_next;
 
+/*
+ * Buffer and index for stdout.
+ */
+
+	unsigned char stream_out_data[SDR_UDP_BUF_MAXLEN];
+	int stream_out_next;
 
 /* For sound output. */
 /* out_wavehdr.dwUser is used to keep track of output buffer state. */
@@ -343,9 +349,16 @@ int audio_open (struct audio_s *pa)
 
 /*
  * Select output device.
- * Only soundcard at this point.
+ * Only soundcard and stdout at this point.
  * Purhaps we'd like to add UDP for an SDR transmitter.
  */
+	    if (strcasecmp(pa->adev[a].adevice_out, "stdout") == 0 || strcmp(pa->adev[a].adevice_out, "-") == 0) {
+	      A->g_audio_out_type = AUDIO_OUT_TYPE_STDOUT;
+	      /* Change - to stdout for readability. */
+	      strlcpy (pa->adev[a].adevice_out, "stdout", sizeof(pa->adev[a].adevice_out));
+	    } else {
+	      A->g_audio_out_type = AUDIO_OUT_TYPE_SOUNDCARD;
+
 	      if (strlen(pa->adev[a].adevice_out) == 1 && isdigit(pa->adev[a].adevice_out[0])) {
 	        out_dev_no[a] = atoi(pa->adev[a].adevice_out);
 	      }
@@ -367,6 +380,7 @@ int audio_open (struct audio_s *pa)
 	          dw_printf ("\"%s\" doesn't match any of the output devices.\n", pa->adev[a].adevice_out);
 	        }
 	      }
+	    }
 	  }   /* if defined */
 	}    /* for each device */
 
@@ -498,6 +512,36 @@ int audio_open (struct audio_s *pa)
 	  }
 	}
 
+// Add UDP or stdout to end of device list if used.
+
+	for (a=0; a<MAX_ADEVS; a++) {
+	  if (pa->adev[a].defined) {
+
+	    struct adev_s *A = &(adev[a]);
+
+	    /* Display stdin or udp:port if appropriate. */
+
+	    if (A->g_audio_out_type != AUDIO_OUT_TYPE_SOUNDCARD) {
+
+	      int aaa;
+	      for (aaa=0; aaa<MAX_ADEVS; aaa++) {
+	        if (pa->adev[aaa].defined) {
+	          dw_printf (" %c", a == aaa ? '*' : ' ');
+
+	        }
+	      }
+	      dw_printf ("  %s                             ", pa->adev[a].adevice_out);	/* should be UDP:nnnn or stdout */
+
+	      if (pa->adev[a].num_channels == 2) {
+	        dw_printf ("   (channels %d & %d)", ADEVFIRSTCHAN(a), ADEVFIRSTCHAN(a)+1);
+	      }
+	      else {
+	        dw_printf ("   (channel %d)", ADEVFIRSTCHAN(a));
+	      }
+	      dw_printf ("\n");
+	    }
+	  }
+	}
 
 /*
  * Open for each audio device input/output pair.
@@ -523,17 +567,20 @@ int audio_open (struct audio_s *pa)
 
 /*
  * Open the audio output device.
- * Soundcard is only possibility at this time.
+ * Soundcard and stdout are only possibility at this time.
  */
 
+	    switch (A->g_audio_out_type) {
+
+	      case AUDIO_OUT_TYPE_SOUNDCARD:
+
 	        err = waveOutOpen (&(A->audio_out_handle), out_dev_no[a], &wf, (DWORD_PTR)out_callback, a, CALLBACK_FUNCTION);
 	          if (err != MMSYSERR_NOERROR) {
 	            text_color_set(DW_COLOR_ERROR);
 	            dw_printf ("Could not open audio device for output.\n");
 	            return (-1);
 	          }
-	  
-
+	        break;
 /*
  * Set up the output buffers.
  * We use dwUser to indicate it is available for filling.
@@ -548,6 +595,18 @@ int audio_open (struct audio_s *pa)
 	        }
 	        A->out_current = 0;
 
+	      case AUDIO_OUT_TYPE_STDOUT:
+
+	        setmode (STDOUT_FILENO, _O_BINARY);
+	        A->stream_out_next= 0;
+	        break;
+
+	      default:
+
+	        text_color_set(DW_COLOR_ERROR);
+	        dw_printf ("Internal error, invalid audio_out_type\n");
+	        return (-1);
+	    }
 
 /*
  * Open audio input device.
@@ -943,6 +1002,10 @@ int audio_put (int a, int c)
 	struct adev_s *A;
 	A = &(adev[a]); 
 
+	switch (A->g_audio_out_type) {
+
+	  case AUDIO_OUT_TYPE_SOUNDCARD:
+
 /* 
  * Wait if no buffers are available.
  * Don't use p yet because compiler might might consider dwFlags a loop invariant. 
@@ -986,6 +1049,20 @@ int audio_put (int a, int c)
 	    if (p->dwBufferLength == (DWORD)(A->outbuf_size)) {
 	      return (audio_flush(a));
 	    }
+	    break;
+
+	  case AUDIO_OUT_TYPE_STDOUT:
+
+	    A->stream_out_data[A->stream_out_next++] = c;
+
+	    assert(A->stream_out_next > 0);
+	    assert(A->stream_out_next <= SDR_UDP_BUF_MAXLEN);
+
+	    if (A->stream_out_next == SDR_UDP_BUF_MAXLEN) {
+	      return (audio_flush(a));
+	    }
+	    break;
+	}
 
 	return (0);
 
@@ -1016,6 +1093,8 @@ int audio_flush (int a)
 
 	A = &(adev[a]); 
 
+	switch (A->g_audio_out_type) {
+	  case AUDIO_OUT_TYPE_SOUNDCARD:
 	    p = (LPWAVEHDR)(&(A->out_wavehdr[A->out_current]));
 
 	    if (p->dwUser == DWU_FILLING && p->dwBufferLength > 0) {
@@ -1037,6 +1116,31 @@ int audio_flush (int a)
 	      }
 	      A->out_current = (A->out_current + 1) % NUM_OUT_BUF;
 	    }
+	    break;
+
+	  case AUDIO_OUT_TYPE_STDOUT:;
+
+	    int res;
+	    unsigned char *ptr;
+	    unsigned int len;
+
+	    ptr = A->stream_out_data;
+	    len = A->stream_out_next;
+
+	    while (len > 0) {
+	      res = write(STDOUT_FILENO, ptr, len);
+	      if (res < 0) {
+	        text_color_set (DW_COLOR_ERROR);
+	        dw_printf ("stdout audio write error %d\n", res);
+	        return (-1);
+	      }
+	      ptr += res;
+	      len -= res;
+	    }
+
+	    A->stream_out_next = 0;
+	    break;
+	}
 	return (0);
 
 } /* end audio_flush */

src/textcolor.c

@@ -384,6 +384,7 @@ int dw_printf (const char *fmt, ...)
 // TODO: other possible destinations...
 
 	fputs (buffer, g_dw_printf_dest);
+	fflush (g_dw_printf_dest);
 	return (len);
 }