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examples: add a dumb /dev/audio support

--- /dev/null

+++ b/examples/devaudioio.c

@@ -1,0 +1,53 @@

+#include <aubio.h>

+#include "config.h"

+#include "utils.h"

+#include "aubio_priv.h"

+#include "devaudioio.h"

+#include <bio.h>

+

+static Biobuf *f;

+static s16int *fbuf;

+static fvec_t *ibuf, *obuf;

+static int nframes;

+

+void

+new_aubio_devaudio(int hop_size)

+{

+	if((f = Bopen("/dev/audio", OREAD)) == nil){

+		AUBIO_ERR("failed to open /dev/audio for reading\n");

+		AUBIO_QUIT(AUBIO_FAIL);

+	}

+	nframes = hop_size;

+	ibuf = new_fvec(hop_size);

+	obuf = new_fvec(hop_size);

+	if(ibuf == nil || obuf == nil || (fbuf = malloc(nframes*2*2)) == nil){

+		AUBIO_ERR("no memory\n");

+		AUBIO_QUIT(AUBIO_FAIL);

+	}

+}

+

+int

+aubio_devaudio_get_samplerate(void)

+{

+	return 44100;

+}

+

+void

+aubio_devaudio_activate(aubio_process_func_t func, aubio_print_func_t printf)

+{

+	double l;

+	int i;

+

+	while(9){

+		if(Bread(f, fbuf, nframes*2*2) != nframes*2*2)

+			break;

+		for(i = 0; i < nframes; i++){

+			fvec_get_sample(obuf, i);

+			l = (fbuf[i*2+0] + fbuf[i*2+1]) / 8192;

+			// ignoring right channel

+			fvec_set_sample(ibuf, l, i);

+		}

+		func(ibuf, obuf);

+		printf();

+	}

+}

--- /dev/null

+++ b/examples/devaudioio.h

@@ -1,0 +1,3 @@

+void new_aubio_devaudio(int hop_size);

+int aubio_devaudio_get_samplerate(void);

+void aubio_devaudio_activate(aubio_process_func_t f, aubio_print_func_t print);

--- a/examples/mkfile

+++ b/examples/mkfile

@@ -1,13 +1,15 @@

 </$objtype/mkfile

 TARG=aubiomfcc aubionotes aubioonset aubiopitch aubioquiet aubiotrack

-CFLAGS=$CFLAGS -DHAVE_CONFIG_H=1 -DHAVE_AUBIO_DOUBLE=1 -D__plan9__ -p -I../src/plan9 -I../src -I/sys/include/npe

+CFLAGS=$CFLAGS -DHAVE_CONFIG_H=1 -DHAVE_AUBIO_DOUBLE=1 -DHAVE_DEVAUDIO=1 -D__plan9__ -p -I../src/plan9 -I../src -I/sys/include/npe

 LIB=../src/libaubio.a$O

 OFILES=\

-	utils.$O

+	devaudioio.$O\

+	utils.$O\

 HFILES=\

+	devaudioio.h\

 	parse_args.h\

 	utils.h\

--- a/examples/parse_args.h

+++ b/examples/parse_args.h

@@ -28,6 +28,7 @@

 extern int quiet;

 // input / output

 extern int usejack;

+extern int usedevaudio;

 extern char_t *source_uri;

 extern char_t *sink_uri;

 // general stuff

@@ -234,6 +235,7 @@

         break;

       case 'j':

         usejack = 1;

+        usedevaudio = 1;

         break;

       case 'N':

         miditap_note = (smpl_t) atoi (optarg);

@@ -331,6 +333,9 @@

 #if HAVE_JACK

     verbmsg("No input source given, using jack\n");

     usejack = 1;

+#elif HAVE_DEVAUDIO

+    verbmsg("No input source given, using devaudio\n");

+    usedevaudio = 1;

 #else

     errmsg("Error: no arguments given (and no available audio input)\n");

     errmsg("       consider recompiling with jack support (--enable-jack)\n");

--- a/examples/utils.c

+++ b/examples/utils.c

@@ -31,10 +31,14 @@

 #ifdef HAVE_JACK

 #include "jackio.h"

 #endif /* HAVE_JACK */

+#ifdef HAVE_DEVAUDIO

+#include "devaudioio.h"

+#endif /* HAVE_DEVAUDIO */

 int verbose = 0;

 int quiet = 0;

 int usejack = 0;

+int usedevaudio = 0;

 // input / output

 char_t *sink_uri = NULL;

 char_t *source_uri = NULL;

@@ -97,7 +101,7 @@

   /* parse command line arguments */

   parse_args (argc, argv);

-  if (!usejack) {

+  if (!usejack && !usedevaudio) {

     debug ("Opening files ...\n");

     this_source = new_aubio_source ((char_t*)source_uri, samplerate, hop_size);

     if (this_source == NULL) {

@@ -127,6 +131,13 @@

     samplerate = aubio_jack_get_samplerate (jack_setup);

     source_uri = "jack";

 #endif /* HAVE_JACK */

+#ifdef HAVE_DEVAUDIO

+  } else {

+    debug ("devaudio init ...\n");

+    new_aubio_devaudio (hop_size);

+    samplerate = aubio_devaudio_get_samplerate ();

+    source_uri = "devaudio";

+#endif /* HAVE_DEVAUDIO */

   }

   input_buffer = new_fvec (hop_size);

   output_buffer = new_fvec (hop_size);

@@ -147,7 +158,7 @@

 {

   uint_t read = 0;

-  if (usejack) {

+  if (usejack || usedevaudio) {

 #ifdef HAVE_JACK

     ev.size = MAX_MIDI_EVENT_SIZE;

@@ -157,6 +168,10 @@

     debug ("Processing (Ctrl+C to quit) ...\n");

     pause ();

     aubio_jack_close (jack_setup);

+#elif HAVE_DEVAUDIO

+    debug ("devaudio activation ...\n");

+    debug ("Processing (Del to quit) ...\n");

+    aubio_devaudio_activate (process_func, print);

 #else /* HAVE_JACK */

     usage (stderr, 1);

     outmsg ("Compiled without jack output, exiting.\n");