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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromeos/ash/components/audio/audio_device_encoding.h"
#include <bitset>
#include "base/check.h"
#include "chromeos/ash/components/audio/audio_device.h"
namespace ash {
namespace {
// Bit size for a set of audio devices.
const size_t kSingleDeviceSetBitSize = 14;
// Gets the bit position of all current input/output device set.
// Do not change position since it's used for histograms.
size_t GetBitPositionFromDeviceType(AudioDeviceType type) {
switch (type) {
case AudioDeviceType::kInternalMic:
case AudioDeviceType::kFrontMic:
case AudioDeviceType::kRearMic:
case AudioDeviceType::kInternalSpeaker:
return 0;
case AudioDeviceType::kMic:
case AudioDeviceType::kHeadphone:
case AudioDeviceType::kLineout:
return 2;
case AudioDeviceType::kUsb:
return 4;
case AudioDeviceType::kBluetooth:
case AudioDeviceType::kBluetoothNbMic:
return 6;
case AudioDeviceType::kHdmi:
return 8;
default:
// All other types.
return 10;
}
}
// Counts the device to the given val.
void CountDevice(std::bitset<kSingleDeviceSetBitSize>& val,
const AudioDevice& device) {
size_t pos = GetBitPositionFromDeviceType(device.type);
// The position for each device type should be an even number.
CHECK(pos % 2 == 0);
// If current bit is off, turn it on no matter next bit is on or off.
if (!val.test(pos)) {
val.set(pos, true);
} else if (!val.test(pos + 1)) {
// If current bit is on and next bit is off, flip both of them.
val.flip(pos);
val.flip(pos + 1);
}
}
} // namespace
uint32_t EncodeAudioDeviceSet(const AudioDeviceList& devices) {
std::bitset<kSingleDeviceSetBitSize> number = 0b0;
for (const AudioDevice& device : devices) {
CountDevice(number, device);
}
return static_cast<uint32_t>(number.to_ulong());
}
uint32_t EncodeBeforeAndAfterAudioDeviceSets(
const AudioDeviceList& device_set_before,
const AudioDeviceList& device_set_after) {
uint32_t number_before = EncodeAudioDeviceSet(device_set_before);
uint32_t number_after = EncodeAudioDeviceSet(device_set_after);
return (number_before << kSingleDeviceSetBitSize) | number_after;
}
} // namespace ash
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