base-call: implement generic audio channel setup/cleanup handlers

Modems that require specific commands to setup or cleanup the audio
channel as soon as a call is ongoing can subclass these two new
methods.

The setup() method is considered part of the call start/accept
process, and so if it fails, the whole operation will fail.

The failures in the cleanup() method will be reported in the log, but
otherwise ignored, as this operation may be executed without any
user intervention (e.g. if the remote party hangs up).

src/mm-base-call.c

@@ -60,6 +60,9 @@ struct _MMBaseCallPrivate {
 
     guint incoming_timeout;
     GRegex *in_call_events;
+
+    /* The port used for audio while call is ongoing, if known */
+    MMPort *audio_port;
 };
 
 /*****************************************************************************/
@@ -163,6 +166,27 @@ mm_base_call_incoming_refresh (MMBaseCall *self)
     self->priv->incoming_timeout = g_timeout_add_seconds (INCOMING_TIMEOUT_SECS, (GSourceFunc)incoming_timeout_cb, self);
 }
 
+/*****************************************************************************/
+/* Update audio settings */
+
+static void
+update_audio_settings (MMBaseCall        *self,
+                       MMPort            *audio_port,
+                       MMCallAudioFormat *audio_format)
+{
+    if (!audio_port && self->priv->audio_port && mm_port_get_connected (self->priv->audio_port))
+        mm_port_set_connected (self->priv->audio_port, FALSE);
+    g_clear_object (&self->priv->audio_port);
+
+    if (audio_port) {
+        self->priv->audio_port = g_object_ref (audio_port);
+        mm_port_set_connected (self->priv->audio_port, TRUE);
+    }
+
+    mm_gdbus_call_set_audio_port   (MM_GDBUS_CALL (self), audio_port ? mm_port_get_device (audio_port) : NULL);
+    mm_gdbus_call_set_audio_format (MM_GDBUS_CALL (self), mm_call_audio_format_get_dictionary (audio_format));
+}
+
 /*****************************************************************************/
 /* Start call (DBus call handling) */
 
@@ -181,6 +205,50 @@ handle_start_context_free (HandleStartContext *ctx)
     g_free (ctx);
 }
 
+static void
+call_started (HandleStartContext *ctx)
+{
+    mm_info ("call is started");
+
+    /* If dialing to ringing supported, leave it dialing */
+    if (!ctx->self->priv->supports_dialing_to_ringing) {
+        /* If ringing to active supported, set it ringing */
+        if (ctx->self->priv->supports_ringing_to_active)
+            mm_base_call_change_state (ctx->self, MM_CALL_STATE_RINGING_OUT, MM_CALL_STATE_REASON_OUTGOING_STARTED);
+        else
+            /* Otherwise, active right away */
+            mm_base_call_change_state (ctx->self, MM_CALL_STATE_ACTIVE, MM_CALL_STATE_REASON_OUTGOING_STARTED);
+    }
+    mm_gdbus_call_complete_start (MM_GDBUS_CALL (ctx->self), ctx->invocation);
+    handle_start_context_free (ctx);
+}
+
+static void
+start_setup_audio_channel_ready (MMBaseCall         *self,
+                                 GAsyncResult       *res,
+                                 HandleStartContext *ctx)
+{
+    MMPort            *audio_port = NULL;
+    MMCallAudioFormat *audio_format = NULL;
+    GError            *error = NULL;
+
+    if (!MM_BASE_CALL_GET_CLASS (self)->setup_audio_channel_finish (self, res, &audio_port, &audio_format, &error)) {
+        mm_warn ("Couldn't setup audio channel: '%s'", error->message);
+        mm_base_call_change_state (self, MM_CALL_STATE_TERMINATED, MM_CALL_STATE_REASON_AUDIO_SETUP_FAILED);
+        g_dbus_method_invocation_take_error (ctx->invocation, error);
+        handle_start_context_free (ctx);
+        return;
+    }
+
+    if (audio_port || audio_format) {
+        update_audio_settings (self, audio_port, audio_format);
+        g_clear_object (&audio_port);
+        g_clear_object (&audio_format);
+    }
+
+    call_started (ctx);
+}
+
 static void
 handle_start_ready (MMBaseCall         *self,
                     GAsyncResult       *res,
@@ -200,19 +268,21 @@ handle_start_ready (MMBaseCall *self,
         else
             mm_base_call_change_state (self, MM_CALL_STATE_TERMINATED, MM_CALL_STATE_REASON_UNKNOWN);
         g_dbus_method_invocation_take_error (ctx->invocation, error);
-    } else {
-        /* If dialing to ringing supported, leave it dialing */
-        if (!self->priv->supports_dialing_to_ringing) {
-            /* If ringing to active supported, set it ringing */
-            if (self->priv->supports_ringing_to_active)
-                mm_base_call_change_state (self, MM_CALL_STATE_RINGING_OUT, MM_CALL_STATE_REASON_OUTGOING_STARTED);
-            else
-                /* Otherwise, active right away */
-                mm_base_call_change_state (self, MM_CALL_STATE_ACTIVE, MM_CALL_STATE_REASON_OUTGOING_STARTED);
-        }
-        mm_gdbus_call_complete_start (MM_GDBUS_CALL (ctx->self), ctx->invocation);
-    }
         handle_start_context_free (ctx);
+        return;
+    }
+
+    /* If there is an audio setup method, run it now */
+    if (MM_BASE_CALL_GET_CLASS (self)->setup_audio_channel) {
+        mm_info ("setting up audio channel...");
+        MM_BASE_CALL_GET_CLASS (self)->setup_audio_channel (self,
+                                                            (GAsyncReadyCallback) start_setup_audio_channel_ready,
+                                                            ctx);
+        return;
+    }
+
+    /* Otherwise, we're done */
+    call_started (ctx);
 }
 
 static void
@@ -300,6 +370,46 @@ handle_accept_context_free (HandleAcceptContext *ctx)
     g_free (ctx);
 }
 
+static void
+call_accepted (HandleAcceptContext *ctx)
+{
+    mm_info ("call is accepted");
+
+    if (ctx->self->priv->incoming_timeout) {
+        g_source_remove (ctx->self->priv->incoming_timeout);
+        ctx->self->priv->incoming_timeout = 0;
+    }
+    mm_base_call_change_state (ctx->self, MM_CALL_STATE_ACTIVE, MM_CALL_STATE_REASON_ACCEPTED);
+    mm_gdbus_call_complete_accept (MM_GDBUS_CALL (ctx->self), ctx->invocation);
+    handle_accept_context_free (ctx);
+}
+
+static void
+accept_setup_audio_channel_ready (MMBaseCall          *self,
+                                  GAsyncResult        *res,
+                                  HandleAcceptContext *ctx)
+{
+    MMPort            *audio_port = NULL;
+    MMCallAudioFormat *audio_format = NULL;
+    GError            *error = NULL;
+
+    if (!MM_BASE_CALL_GET_CLASS (self)->setup_audio_channel_finish (self, res, &audio_port, &audio_format, &error)) {
+        mm_warn ("Couldn't setup audio channel: '%s'", error->message);
+        mm_base_call_change_state (self, MM_CALL_STATE_TERMINATED, MM_CALL_STATE_REASON_AUDIO_SETUP_FAILED);
+        g_dbus_method_invocation_take_error (ctx->invocation, error);
+        handle_accept_context_free (ctx);
+        return;
+    }
+
+    if (audio_port || audio_format) {
+        update_audio_settings (self, audio_port, audio_format);
+        g_clear_object (&audio_port);
+        g_clear_object (&audio_format);
+    }
+
+    call_accepted (ctx);
+}
+
 static void
 handle_accept_ready (MMBaseCall *self,
                      GAsyncResult *res,
@@ -310,15 +420,21 @@ handle_accept_ready (MMBaseCall *self,
     if (!MM_BASE_CALL_GET_CLASS (self)->accept_finish (self, res, &error)) {
         mm_base_call_change_state (self, MM_CALL_STATE_TERMINATED, MM_CALL_STATE_REASON_ERROR);
         g_dbus_method_invocation_take_error (ctx->invocation, error);
-    } else {
-        if (ctx->self->priv->incoming_timeout) {
-            g_source_remove (ctx->self->priv->incoming_timeout);
-            ctx->self->priv->incoming_timeout = 0;
-        }
-        mm_base_call_change_state (self, MM_CALL_STATE_ACTIVE, MM_CALL_STATE_REASON_ACCEPTED);
-        mm_gdbus_call_complete_accept (MM_GDBUS_CALL (ctx->self), ctx->invocation);
-    }
         handle_accept_context_free (ctx);
+        return;
+    }
+
+    /* If there is an audio setup method, run it now */
+    if (MM_BASE_CALL_GET_CLASS (self)->setup_audio_channel) {
+        mm_info ("setting up audio channel...");
+        MM_BASE_CALL_GET_CLASS (self)->setup_audio_channel (self,
+                                                            (GAsyncReadyCallback) accept_setup_audio_channel_ready,
+                                                            ctx);
+        return;
+    }
+
+    /* Otherwise, we're done */
+    call_accepted (ctx);
 }
 
 static void
@@ -677,6 +793,18 @@ mm_base_call_get_path (MMBaseCall *self)
      state == MM_CALL_STATE_RINGING_OUT ||      \
      state == MM_CALL_STATE_ACTIVE)
 
+static void
+cleanup_audio_channel_ready (MMBaseCall   *self,
+                             GAsyncResult *res)
+{
+    GError *error = NULL;
+
+    if (!MM_BASE_CALL_GET_CLASS (self)->cleanup_audio_channel_finish (self, res, &error)) {
+        mm_warn ("audio channel cleanup failed: %s", error->message);
+        g_error_free (error);
+    }
+}
+
 void
 mm_base_call_change_state (MMBaseCall        *self,
                            MMCallState        new_state,
@@ -710,6 +838,13 @@ mm_base_call_change_state (MMBaseCall        *self,
             mm_warn ("Couldn't cleanup in-call unsolicited events: %s", error->message);
             g_error_free (error);
         }
+        if (MM_BASE_CALL_GET_CLASS (self)->cleanup_audio_channel) {
+            mm_info ("cleaning up audio channel...");
+            update_audio_settings (self, NULL, NULL);
+            MM_BASE_CALL_GET_CLASS (self)->cleanup_audio_channel (self,
+                                                                  (GAsyncReadyCallback) cleanup_audio_channel_ready,
+                                                                  NULL);
+        }
     }
 
     mm_gdbus_call_set_state (MM_GDBUS_CALL (self), new_state);
@@ -724,21 +859,6 @@ mm_base_call_received_dtmf (MMBaseCall *self,
     mm_gdbus_call_emit_dtmf_received (MM_GDBUS_CALL (self), dtmf);
 }
 
-void
-mm_base_call_set_audio_port (MMBaseCall *self, const gchar *port)
-{
-    mm_gdbus_call_set_audio_port (MM_GDBUS_CALL (self), port);
-}
-
-void
-mm_base_call_set_audio_format (MMBaseCall *self,
-                               MMCallAudioFormat *audio_format)
-{
-    mm_gdbus_call_set_audio_format (
-        MM_GDBUS_CALL (self),
-        mm_call_audio_format_get_dictionary (audio_format));
-}
-
 /*****************************************************************************/
 /* Start the CALL */
 
@@ -1067,6 +1187,8 @@ dispose (GObject *object)
 {
     MMBaseCall *self = MM_BASE_CALL (object);
 
+    g_clear_object (&self->priv->audio_port);
+
     if (self->priv->incoming_timeout) {
         g_source_remove (self->priv->incoming_timeout);
         self->priv->incoming_timeout = 0;

src/mm-base-call.h

@@ -88,6 +88,22 @@ struct _MMBaseCallClass {
                                              GError     **error);
     gboolean (* cleanup_unsolicited_events) (MMBaseCall  *self,
                                              GError     **error);
+
+    /* Setup/cleanup audio channel */
+    void     (* setup_audio_channel)          (MMBaseCall           *self,
+                                               GAsyncReadyCallback   callback,
+                                               gpointer              user_data);
+    gboolean (* setup_audio_channel_finish)   (MMBaseCall           *self,
+                                               GAsyncResult         *res,
+                                               MMPort              **audio_port,
+                                               MMCallAudioFormat   **audio_format,
+                                               GError              **error);
+    void     (* cleanup_audio_channel)        (MMBaseCall           *self,
+                                               GAsyncReadyCallback   callback,
+                                               gpointer              user_data);
+    gboolean (* cleanup_audio_channel_finish) (MMBaseCall           *self,
+                                               GAsyncResult         *res,
+                                               GError              **error);
 };
 
 GType mm_base_call_get_type (void);
@@ -105,11 +121,6 @@ void         mm_base_call_change_state (MMBaseCall *self,
                                         MMCallState new_state,
                                         MMCallStateReason reason);
 
-void         mm_base_call_set_audio_port   (MMBaseCall *self,
-                                            const gchar *port);
-void         mm_base_call_set_audio_format (MMBaseCall *self,
-                                            MMCallAudioFormat *audio_format);
-
 void         mm_base_call_received_dtmf (MMBaseCall *self,
                                          const gchar *dtmf);