From e7016f9f02379cc5b95d6e8d7e123a5a0e5e2d34 Mon Sep 17 00:00:00 2001
From: Andreas Eversberg <jolly@eversberg.eu>
Date: Sun, 21 Jan 2018 10:43:45 +0100
Subject: [PATCH] Make sound card support (Alsa) optional

---
 libmncc/Makefile.am    |  5 +++++
 libmncc/mncc_console.c | 17 ++++++++++++++++-
 libmobile/Makefile.am  |  4 ++++
 libmobile/sender.c     |  6 ++++++
 libmobile/sender.h     |  2 ++
 libsdr/sdr.h           |  2 ++
 libsound/Makefile.am   |  2 ++
 7 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/libmncc/Makefile.am b/libmncc/Makefile.am
index 7881872..491a3ef 100644
--- a/libmncc/Makefile.am
+++ b/libmncc/Makefile.am
@@ -8,3 +8,8 @@ libmncc_a_SOURCES = \
 	mncc_sock.c \
 	testton.c \
 	cause.c
+
+if HAVE_ALSA
+AM_CPPFLAGS += -DHAVE_ALSA
+endif
+
diff --git a/libmncc/mncc_console.c b/libmncc/mncc_console.c
index 72ce21c..912f339 100644
--- a/libmncc/mncc_console.c
+++ b/libmncc/mncc_console.c
@@ -33,7 +33,9 @@
 #include "mncc_console.h"
 #include "cause.h"
 #include "../libmobile/call.h"
+#ifdef HAVE_ALSA
 #include "../libsound/sound.h"
+#endif
 
 static int new_callref = 0; /* toward mobile */
 
@@ -289,11 +291,12 @@ error:
 	return rc;
 }
 
-int console_open_audio(int latspl)
+int console_open_audio(int __attribute__((unused)) latspl)
 {
 	if (!console.audiodev[0])
 		return 0;
 
+#ifdef HAVE_ALSA
 	/* open sound device for call control */
 	/* use factor 1.4 of speech level for complete range of sound card */
 	console.sound = sound_open(console.audiodev, NULL, NULL, 1, 0.0, console.samplerate, latspl, 1.4, 4000.0);
@@ -301,6 +304,10 @@ int console_open_audio(int latspl)
 		PDEBUG(DSENDER, DEBUG_ERROR, "No sound device!\n");
 		return -EIO;
 	}
+#else
+	PDEBUG(DSENDER, DEBUG_ERROR, "No sound card support compiled in!\n");
+	return -ENOTSUP;
+#endif
 
 	return 0;
 }
@@ -310,14 +317,20 @@ int console_start_audio(void)
 	if (!console.audiodev[0])
 		return 0;
 
+#ifdef HAVE_ALSA
 	return sound_start(console.sound);
+#else
+	return -EINVAL;
+#endif
 }
 
 void console_cleanup(void)
 {
+#ifdef HAVE_ALSA
 	/* close sound devoice */
 	if (console.sound)
 		sound_close(console.sound);
+#endif
 
 	jitter_destroy(&console.dejitter);
 }
@@ -428,6 +441,7 @@ void process_console(int c)
 	if (!console.sound)
 		return;
 
+#ifdef HAVE_ALSA
 	/* handle audio, if sound device is used */
 	sample_t samples[console.latspl + 10], *samples_list[1];
 	uint8_t *power_list[1];
@@ -487,5 +501,6 @@ void process_console(int c)
 			}
 		}
 	}
+#endif
 }
 
diff --git a/libmobile/Makefile.am b/libmobile/Makefile.am
index 045d548..f75cfe5 100644
--- a/libmobile/Makefile.am
+++ b/libmobile/Makefile.am
@@ -7,6 +7,10 @@ libmobile_a_SOURCES = \
 	call.c \
 	main_mobile.c
 
+if HAVE_ALSA
+AM_CPPFLAGS += -DHAVE_ALSA
+endif
+
 if HAVE_SDR
 AM_CPPFLAGS += -DHAVE_SDR
 endif
diff --git a/libmobile/sender.c b/libmobile/sender.c
index 728fa46..b309c4d 100644
--- a/libmobile/sender.c
+++ b/libmobile/sender.c
@@ -115,12 +115,18 @@ int sender_create(sender_t *sender, int kanal, double sendefrequenz, double empf
 		} else
 #endif
 		{
+#ifdef HAVE_ALSA
 			sender->audio_open = sound_open;
 			sender->audio_start = sound_start;
 			sender->audio_close = sound_close;
 			sender->audio_read = sound_read;
 			sender->audio_write = sound_write;
 			sender->audio_get_tosend = sound_get_tosend;
+#else
+			PDEBUG(DSENDER, DEBUG_ERROR, "No sound card support compiled in!\n");
+			rc = -ENOTSUP;
+			goto error;
+#endif
 		}
 	}
 
diff --git a/libmobile/sender.h b/libmobile/sender.h
index 1bcb1c0..6591f35 100644
--- a/libmobile/sender.h
+++ b/libmobile/sender.h
@@ -1,4 +1,6 @@
+#ifdef HAVE_ALSA
 #include "../libsound/sound.h"
+#endif
 #ifdef HAVE_SDR
 #include "../libsdr/sdr.h"
 #endif
diff --git a/libsdr/sdr.h b/libsdr/sdr.h
index 360f424..8d31475 100644
--- a/libsdr/sdr.h
+++ b/libsdr/sdr.h
@@ -1,4 +1,6 @@
 
+enum paging_signal;
+
 int sdr_start(void *inst);
 void *sdr_open(const char *audiodev, double *tx_frequency, double *rx_frequency, int channels, double paging_frequency, int samplerate, int latspl, double bandwidth, double sample_deviation);
 void sdr_close(void *inst);
diff --git a/libsound/Makefile.am b/libsound/Makefile.am
index ffa876f..afbbb0a 100644
--- a/libsound/Makefile.am
+++ b/libsound/Makefile.am
@@ -4,3 +4,5 @@ noinst_LIBRARIES = libsound.a
 
 libsound_a_SOURCES = \
 	sound_alsa.c
+
+AM_CPPFLAGS += -DHAVE_ALSA