amix/aumix: add slmagic record routing

Makefile

@@ -50,7 +50,8 @@ external:
 	git clone --depth 1 -b playout_time \
 		https://github.com/baresip/baresip.git external/baresip
 	cd external/re && \
-		patch -p1 < ../../patches/re_aubuf_timestamp_order_fix.patch
+		patch -p1 < ../../patches/re_aubuf_timestamp_order_fix.patch && \
+		patch -p1 < ../../patches/re_aumix_record_only.patch
 
 .PHONY: external_pro
 external_pro: external

modules/amix/amix.c

@@ -42,6 +42,7 @@ struct amix {
 	struct aumix_source *aumix_src;
 	char *device;
 	uint16_t speaker_id;
+	bool magic;
 	bool muted;
 };
 
@@ -140,6 +141,13 @@ static int amix_alloc(struct amix **amixp, const char *device)
 
 	amix->muted = true;
 
+	if (strstr(device, "slmagic")) {
+		amix->magic = true;
+		aumix_source_mute(amix->aumix_src, amix->muted);
+		aumix_source_enable(amix->aumix_src, true);
+		aumix_source_record_only(amix->aumix_src, true);
+	}
+
 out:
 	if (err) {
 		mem_deref(amix);
@@ -303,18 +311,28 @@ static int play_alloc(struct auplay_st **stp, const struct auplay *ap,
 void amix_mute(const char *dev, bool mute, uint16_t id);
 void amix_mute(const char *dev, bool mute, uint16_t id)
 {
-	struct le *le;
+	struct le *le, *le_magic;
+	char dev_magic[128];
+	struct amix *amix_magic = NULL;
 
 	le = hash_lookup(amixl, hash_joaat_str(dev), dev_cmp_h, (void *)dev);
 	if (!le)
 		return;
 
 	struct amix *amix = le->data;
 
+	re_snprintf(dev_magic, sizeof(dev_magic), "%s_slmagic", dev);
+	le_magic = hash_lookup(amixl, hash_joaat_str(dev_magic), dev_cmp_h,
+			       (void *)dev_magic);
+	if (le_magic)
+		amix_magic = le_magic->data;
+
 	aumix_source_mute(amix->aumix_src, mute);
 	amix->muted = mute;
 	if (id) {
 		amix->speaker_id = id;
+		if (amix_magic)
+			amix_magic->speaker_id = 10000 + id;
 
 		if (!list_contains(&speakerl, &amix->sle))
 			list_append(&speakerl, &amix->sle, amix);

patches/re_aumix_record_only.patch

@@ -0,0 +1,54 @@
+diff --git a/rem/aumix/aumix.c b/rem/aumix/aumix.c
+index 95032be..b46fbf7 100644
+--- a/rem/aumix/aumix.c
++++ b/rem/aumix/aumix.c
+@@ -47,6 +47,7 @@ struct aumix_source {
+ 	aumix_read_h *readh;
+ 	void *arg;
+ 	bool muted;
++	bool record_only;
+ };
+
+
+@@ -193,6 +194,9 @@ static int aumix_thread(void *arg)
+ 				if (csrc->muted)
+ 					continue;
+
++				if (csrc->record_only)
++					continue;
++
+ 				for (size_t i = 0; i < mix->frame_size; i++) {
+ 					sample = mix_frame[i] + csrc->frame[i];
+
+@@ -222,6 +226,9 @@ static int aumix_thread(void *arg)
+ 				if (csrc->muted)
+ 					continue;
+
++				if(!csrc->record_only)
++					continue;
++
+ 				for (size_t i = 0; i < mix->frame_size; i++) {
+ 					sample = mix_frame[i] + csrc->frame[i];
+
+@@ -493,6 +500,21 @@ void aumix_source_mute(struct aumix_source *src, bool mute)
+ }
+
+
++/**
++ * Record only aumix source
++ *
++ * @param src    Audio mixer source
++ * @param mute   True to record only, false to disable
++ */
++void aumix_source_record_only(struct aumix_source *src, bool enable)
++{
++	if (!src)
++		return;
++
++	src->record_only = enable;
++}
++
++
+ /**
+  * Enable/disable aumix source
+  *