[pulseaudio-discuss] [PATCH v13 04/10] bluetooth: Set initial A2DP profile which bluez already activated

[Pali Rohár]

Bluez and remote device decide which A2DP codec would use. Use this
selected A2DP codec as initial profile in pulseaudio.

In most cases it is either last used codec or codec with higher priority by
defined by remote device.

To detect which A2DP profile was activated by bluez, look at bluez
transport state.
---
 src/modules/bluetooth/module-bluez5-device.c | 66 +++++++++++++++++++++++++++-
 1 file changed, 65 insertions(+), 1 deletion(-)

diff --git a/src/modules/bluetooth/module-bluez5-device.c b/src/modules/bluetooth/module-bluez5-device.c
index fb77afaad..9afd1dbd1 100644
--- a/src/modules/bluetooth/module-bluez5-device.c
+++ b/src/modules/bluetooth/module-bluez5-device.c
@@ -1993,6 +1993,70 @@ static int uuid_to_profile(const char *uuid, pa_bluetooth_profile_t *_r) {
     return 0;
 }
 
+static void choose_initial_profile(struct userdata *u) {
+    struct pa_bluetooth_transport *transport;
+    pa_card_profile *iter_profile;
+    pa_card_profile *profile;
+    void *state;
+
+    pa_log_debug("Looking for A2DP profile which has active bluez transport for card %s", u->card->name);
+
+    profile = NULL;
+
+    /* First try to find the best A2DP profile with transport in playing state */
+    PA_HASHMAP_FOREACH(iter_profile, u->card->profiles, state) {
+        transport = u->device->transports[*(pa_bluetooth_profile_t *)PA_CARD_PROFILE_DATA(iter_profile)];
+
+        /* Ignore profiles without active bluez transport in playing state */
+        if (!transport || transport->state != PA_BLUETOOTH_TRANSPORT_STATE_PLAYING)
+            continue;
+
+        /* Ignore non-A2DP profiles */
+        if (!pa_startswith(iter_profile->name, "a2dp_"))
+            continue;
+
+        pa_log_debug("%s has active bluez transport in playing state", iter_profile->name);
+
+        if (!profile || iter_profile->priority > profile->priority)
+            profile = iter_profile;
+    }
+
+    /* Second if there is no profile A2DP profile with transport in playing state, look at active transports */
+    if (!profile) {
+        PA_HASHMAP_FOREACH(iter_profile, u->card->profiles, state) {
+            transport = u->device->transports[*(pa_bluetooth_profile_t *)PA_CARD_PROFILE_DATA(iter_profile)];
+
+            /* Ignore profiles without active bluez transport */
+            if (!transport || transport->state == PA_BLUETOOTH_TRANSPORT_STATE_DISCONNECTED)
+                continue;
+
+            /* Ignore non-A2DP profiles */
+            if (!pa_startswith(iter_profile->name, "a2dp_"))
+                continue;
+
+            pa_log_debug("%s has active bluez transport", iter_profile->name);
+
+            if (!profile || iter_profile->priority > profile->priority)
+                profile = iter_profile;
+        }
+    }
+
+    /* When there is no active A2DP bluez transport, fallback to core pulseaudio function for choosing initial profile */
+    if (!profile) {
+        pa_log_debug("No A2DP profile with bluez active transport was found for card %s", u->card->name);
+        pa_card_choose_initial_profile(u->card);
+        return;
+    }
+
+    /* Do same job as pa_card_choose_initial_profile() */
+    pa_log_info("Setting initial A2DP profile '%s' for card %s", profile->name, u->card->name);
+    u->card->active_profile = profile;
+    u->card->save_profile = false;
+
+    /* Let policy modules override the default. */
+    pa_hook_fire(&u->card->core->hooks[PA_CORE_HOOK_CARD_CHOOSE_INITIAL_PROFILE], u->card);
+}
+
 /* Run from main thread */
 static int add_card(struct userdata *u) {
     const pa_bluetooth_device *d;
@@ -2063,7 +2127,7 @@ static int add_card(struct userdata *u) {
 
     u->card->userdata = u;
     u->card->set_profile = set_profile_cb;
-    pa_card_choose_initial_profile(u->card);
+    choose_initial_profile(u);
     pa_card_put(u->card);
 
     p = PA_CARD_PROFILE_DATA(u->card->active_profile);
-- 
2.11.0