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diff --git a/docx/07_interrupts.dox b/docx/07_interrupts.dox new file mode 100644 index 0000000..0e26b88 --- /dev/null +++ b/docx/07_interrupts.dox @@ -0,0 +1,36 @@ + /* + * Copyright (C) 2012, BMW AG + * + * This file is part of GENIVI Project AudioManager. + * + * Contributions are licensed to the GENIVI Alliance under one or more + * Contribution License Agreements. + * + * \copyright + * This Source Code Form is subject to the terms of the + * Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with + * this file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * \\author Christian Linke (christian.linke@bmw.de) + * + */ + /*! + + \page interrupts Interrups & Low Level Interrupts + \section diff Differences + The only difference between a "normal" interrupt and a source for the audioManagement may lie in it's classification, so playing a "normal" interrupt is not + different to changing a source. An exception here are the so called "low level interrupts".\n + \section crit Criterias + These are special sources that fulfill the following criteria: + - direct connection to a sink that is "always on", so no extra actions and communications need to be done in order to play audio + - no dependencies to the current system state need to be checked before playing. This means that the source knows if it is allowed to play at the moment it + wants to play + - all information for the source that is needed to judge if it is allowed to play or not is either directly retrieved by the source or set static via a property. + + This becomes very handy for implementing such things like park distance control. When the source is informed that it needs to output signals + (due to an emerging wall for example) it outputs the beeps directly to the amplifier that then overlays the sound to the current active source.\n + Settings that influence the behavior of low level interrupts like for example volume offset for park distance control or sound on/off for it need to be done via + sourceProperties on the source level, so that the judgment and the adoptions that need to be taken can be taken by the source without system interaction. + In order to give the AudioManagerController the chance to react on a low level interrupt (by lowering the main volume for example), a feedback path is provided + and the AudioManagerController is informed about the current state of the low level interrupt (via hooklInterruptStatusChange).\n +*/ |