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103 lines
3.1 KiB
Plaintext
103 lines
3.1 KiB
Plaintext
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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interface FMRadio : EventTarget {
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/* Indicates if the FM radio is enabled. */
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readonly attribute boolean enabled;
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/* Indicates if the antenna is plugged and available. */
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readonly attribute boolean antennaAvailable;
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/**
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* Current frequency in MHz. The value will be null if the FM radio is
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* disabled.
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*/
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readonly attribute double? frequency;
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/* The upper bound of frequency in MHz. */
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readonly attribute double frequencyUpperBound;
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/* The lower bound of frequency in MHz. */
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readonly attribute double frequencyLowerBound;
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/**
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* The difference in frequency between two "adjacent" channels, in MHz. That
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* is, any two radio channels' frequencies differ by at least channelWidth
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* MHz. Usually, the value is one of:
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* - 0.05 MHz
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* - 0.1 MHz
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* - 0.2 MHz
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*/
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readonly attribute double channelWidth;
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/* Fired when the FM radio is enabled. */
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[SetterThrows]
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attribute EventHandler onenabled;
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/* Fired when the FM radio is disabled. */
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[SetterThrows]
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attribute EventHandler ondisabled;
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/**
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* Fired when the antenna becomes available or unavailable, i.e., fired when
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* the antennaAvailable attribute changes.
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*/
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[SetterThrows]
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attribute EventHandler onantennaavailablechange;
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/* Fired when the FM radio's frequency is changed. */
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[SetterThrows]
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attribute EventHandler onfrequencychange;
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/**
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* Power the FM radio off. The disabled event will be fired if this request
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* completes successfully.
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*/
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DOMRequest disable();
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/**
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* Power the FM radio on, and tune the radio to the given frequency in MHz.
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* This will fail if the given frequency is out of range. The enabled event
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* and frequencychange event will be fired if this request completes
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* successfully.
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*/
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DOMRequest enable(double frequency);
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/**
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* Tune the FM radio to the given frequency. This will fail if the given
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* frequency is out of range.
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*
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* Note that the FM radio may not tuned to the exact frequency given. To get
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* the frequency the radio is actually tuned to, wait for the request to fire
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* sucess (or wait for the frequencychange event to fire), and then read the
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* frequency attribute.
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*/
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DOMRequest setFrequency(double frequency);
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/**
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* Tell the FM radio to seek up to the next channel. If the frequency is
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* successfully changed, the frequencychange event will be triggered.
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*
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* Only one seek is allowed at once: If the radio is seeking when the seekUp
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* is called, error will be fired.
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*/
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DOMRequest seekUp();
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/**
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* Tell the FM radio to seek down to the next channel. If the frequency is
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* successfully changed, the frequencychange event will be triggered.
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*
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* Only one seek is allowed at once: If the radio is seeking when the
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* seekDown is called, error will be fired.
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*/
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DOMRequest seekDown();
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/**
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* Cancel the seek action. If the radio is not currently seeking up or down,
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* error will be fired.
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*/
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DOMRequest cancelSeek();
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};
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