shithub: aubio

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ref: d2af4085e1b9f8c0af6aad661a7059ac8690e037
parent: e00515a9d7d03b30af0d55f8b217e3fff28a0fdf
author: Sigrid Solveig Haflínudóttir <sigrid@ftrv.se>
date: Mon Aug 21 11:45:41 EDT 2023

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");