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os: add mixer utility header for Channel struct 

The notion of a channel is shared by the mixer backend as well as the
frontend. To make dealing with reports between those easier move the
Channel definition to a global header.

Issue #1770.
This commit is contained in:
Josef Söntgen 2015-11-08 20:07:42 +01:00 committed by Christian Helmuth
parent 2c9d2e1d32
commit fe1a0e5f65
1 changed files with 62 additions and 0 deletions
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repos/os/include/mixer/channel.h Normal file
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/*
* \brief Mixer channel class
* \author Josef Soentgen
* \date 2015-10-15
*/
/*
* Copyright (C) 2015 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _INCLUDE__MIXER__CHANNEL_H_
#define _INCLUDE__MIXER__CHANNEL_H_
#include <util/string.h>
#include <util/xml_node.h>
namespace Mixer {
struct Channel;
}
struct Mixer::Channel
{
struct Invalid_channel { };
typedef Genode::String<128> Label;
typedef Genode::String<32> Name;
typedef enum { INVALID = -1, LEFT, RIGHT, MAX_CHANNELS } Number;
typedef enum { TYPE_INVALID, INPUT, OUTPUT } Type;
typedef enum { MIN = 0, MAX = 100 } Volume_level;
Type type;
Number number;
Label label;
int volume;
bool active;
bool muted;
Channel(Genode::Xml_node const &node)
{
Genode::String<8> tmp;
try { node.attribute("type").value(&tmp); }
catch (...) { throw Invalid_channel(); }
if (tmp == "input") type = INPUT;
else if (tmp == "output") type = OUTPUT;
else throw Invalid_channel();
try {
node.attribute("label").value(&label);
number = (Channel::Number) node.attribute_value<long>("number", 0);
volume = node.attribute_value<long>("volume", 0);
active = node.attribute_value<long>("active", 0);
muted = node.attribute_value<long>("muted", 0);
} catch (...) { throw Invalid_channel(); }
}
};
#endif /* _INCLUDE__MIXER__CHANNEL_H_ */