Version of the interface the hal implements. There should be one section per audio HW module present on the platform. Each contains two mandatory tags: “halVersion” and “name”. The module "name" is the same as in previous .conf file. Each module must contain the following sections: - : a list of device descriptors for all input and output devices accessible via this module. This contains both permanently attached devices and removable devices. - : listing all output and input streams exposed by the audio HAL - : list of possible connections between input and output devices or between stream and devices. A is defined by a set of 3 attributes: -"type": mux|mix means all sources are mutual exclusive (mux) or can be mixed (mix) -"sink": the sink involved in this route -"sources": all the sources than can be connected to the sink via this route - : permanently attached devices. The attachedDevices section is a list of devices names. Their names correspond to device names defined in "devicePorts" section. - is the device to be used when no policy rule applies "|" separated list of audio_output_flags_t or audio_input_flags_t. When choosing the mixPort of an audio track, the audioPolicy first considers the mixPorts with a preferredUsage including the track AudioUsage preferred . If non support the track format, the other mixPorts are considered. Eg: a will receive the audio of all apps playing with a MEDIA usage. It may receive audio from ALARM if there are no audio compatible . Comma (",") separated list of channel flags from audio_channel_mask_t. The default device will be used if multiple have the same type and no explicit route request exists for a specific device of that type. List all available sources for a given sink. Comma separated pair of number. The fist one is the framework level (between 0 and 100). The second one is the volume to send to the HAL. The framework will interpolate volumes not specified. Their MUST be at least 2 points specified. Volume section defines a volume curve for a given use case and device category. It contains a list of points of this curve expressing the attenuation in Millibels for a given volume index from 0 to 100. 0,-9600 100,0 It may also reference a reference/@name to avoid duplicating curves. 0,-9600 100,0