Listen to and follow external Android volume changes. (Based on FS#11914 by Maurus Cuelenaere)

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29586 a1c6a512-1295-4272-9138-f99709370657

4 files changed, 33 insertions, 0 deletions

diff --git a/firmware/export/config/android.h b/firmware/export/config/android.h
index ed1a283..69a758d 100644
--- a/firmware/export/config/android.h
+++ b/firmware/export/config/android.h
@@ -79,6 +79,9 @@
 /* define this if the target has volume keys which can be used in the lists */
 #define HAVE_VOLUME_IN_LIST
 
+/* define this if the host platform can change volume outside of rockbox */
+#define PLATFORM_HAS_VOLUME_CHANGE
+
 #define HAVE_SW_TONE_CONTROLS 
 
 /* Define current usage levels. */
diff --git a/firmware/export/kernel.h b/firmware/export/kernel.h
index 6aaf11d..66efce3 100644
--- a/firmware/export/kernel.h
+++ b/firmware/export/kernel.h
@@ -83,6 +83,7 @@
 #define SYS_IAP_HANDLEPKT         MAKE_SYS_EVENT(SYS_EVENT_CLS_MISC, 2)
 #define SYS_CALL_INCOMING         MAKE_SYS_EVENT(SYS_EVENT_CLS_MISC, 3)
 #define SYS_CALL_HUNG_UP          MAKE_SYS_EVENT(SYS_EVENT_CLS_MISC, 4)
+#define SYS_VOLUME_CHANGED        MAKE_SYS_EVENT(SYS_EVENT_CLS_MISC, 5)
 
 #define IS_SYSEVENT(ev)           ((ev & SYS_EVENT) == SYS_EVENT)
 
diff --git a/firmware/export/system.h b/firmware/export/system.h
index 78bddae..3f626c3 100644
--- a/firmware/export/system.h
+++ b/firmware/export/system.h
@@ -137,6 +137,10 @@ int get_cpu_boost_counter(void);
 #undef htobe32
 #endif
 
+#if (CONFIG_PLATFORM & PLATFORM_HOSTED) && defined(PLATFORM_HAS_VOLUME_CHANGE)
+int hosted_get_volume(void);
+#endif
+
 /* Get the byte offset of a type's member */
 #define OFFSETOF(type, membername) ((off_t)&((type *)0)->membername)
 
diff --git a/firmware/target/hosted/android/pcm-android.c b/firmware/target/hosted/android/pcm-android.c
index 4c34e3c..24881bd 100644
--- a/firmware/target/hosted/android/pcm-android.c
+++ b/firmware/target/hosted/android/pcm-android.c
@@ -179,3 +179,28 @@ void pcm_set_mixer_volume(int volume)
 
     (*env_ptr)->CallVoidMethod(env_ptr, RockboxPCM_instance, set_volume_method, volume);
 }
+
+/* Due to limitations of default_event_handler(), parameters gets swallowed when
+ * being posted with queue_broadcast(), so workaround this by caching the last
+ * value.
+ */
+static int lastPostedVolume = -1;
+int hosted_get_volume(void)
+{
+    return lastPostedVolume;
+}
+
+JNIEXPORT void JNICALL
+Java_org_rockbox_RockboxPCM_postVolumeChangedEvent(JNIEnv *env,
+                                                   jobject this,
+                                                   jint volume)
+{
+    (void) env;
+    (void) this;
+
+    if (volume != lastPostedVolume)
+    {
+        lastPostedVolume = volume;
+        queue_broadcast(SYS_VOLUME_CHANGED, 0);
+    }
+}