@@ -154,6 +154,41 @@ enum AVAppToDevMessageType {

     AV_APP_TO_DEV_PAUSE        = MKBETAG('P', 'A', 'U', ' '),

     AV_APP_TO_DEV_PLAY         = MKBETAG('P', 'L', 'A', 'Y'),

     AV_APP_TO_DEV_TOGGLE_PAUSE = MKBETAG('P', 'A', 'U', 'T'),

+

+    /**

+     * Volume control message.

+     *

+     * Set volume level. It may be device-dependent if volume

+     * is changed per stream or system wide. Per stream volume

+     * change is expected when possible.

+     *

+     * data: double: new volume with range of 0.0 - 1.0.

+     */

+    AV_APP_TO_DEV_SET_VOLUME = MKBETAG('S', 'V', 'O', 'L'),

+

+    /**

+     * Mute control messages.

+     *

+     * Change mute state. It may be device-dependent if mute status

+     * is changed per stream or system wide. Per stream mute status

+     * change is expected when possible.

+     *

+     * data: NULL.

+     */

+    AV_APP_TO_DEV_MUTE        = MKBETAG(' ', 'M', 'U', 'T'),

+    AV_APP_TO_DEV_UNMUTE      = MKBETAG('U', 'M', 'U', 'T'),

+    AV_APP_TO_DEV_TOGGLE_MUTE = MKBETAG('T', 'M', 'U', 'T'),

+

+    /**

+     * Get volume/mute messages.

+     *

+     * Force the device to send AV_DEV_TO_APP_VOLUME_LEVEL_CHANGED or

+     * AV_DEV_TO_APP_MUTE_STATE_CHANGED command respectively.

+     *

+     * data: NULL.

+     */

+    AV_APP_TO_DEV_GET_VOLUME = MKBETAG('G', 'V', 'O', 'L'),

+    AV_APP_TO_DEV_GET_MUTE   = MKBETAG('G', 'M', 'U', 'T'),

 };

 /**

@@ -237,6 +272,24 @@ enum AVDevToAppMessageType {

      */

     AV_DEV_TO_APP_BUFFER_READABLE = MKBETAG('B','R','D',' '),

     AV_DEV_TO_APP_BUFFER_WRITABLE = MKBETAG('B','W','R',' '),

+

+    /**

+     * Mute state change message.

+     *

+     * Device informs that mute state has changed.

+     *

+     * data: int: 0 for not muted state, non-zero for muted state.

+     */

+    AV_DEV_TO_APP_MUTE_STATE_CHANGED = MKBETAG('C','M','U','T'),

+

+    /**

+     * Volume level change message.

+     *

+     * Device informs that volume level has changed.

+     *

+     * data: double: new volume with range of 0.0 - 1.0.

+     */

+    AV_DEV_TO_APP_VOLUME_LEVEL_CHANGED = MKBETAG('C','V','O','L'),

 };

 /**