186 lines
7.5 KiB
C
186 lines
7.5 KiB
C
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/*
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* Copyright (C) 2022 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <algorithm>
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#include <array>
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#include <initializer_list>
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#include <regex>
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#include <type_traits>
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#include <aidl/android/media/audio/common/AudioChannelLayout.h>
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#include <aidl/android/media/audio/common/AudioDeviceType.h>
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#include <aidl/android/media/audio/common/AudioFormatDescription.h>
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#include <aidl/android/media/audio/common/AudioInputFlags.h>
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#include <aidl/android/media/audio/common/AudioMode.h>
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#include <aidl/android/media/audio/common/AudioOutputFlags.h>
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#include <aidl/android/media/audio/common/PcmType.h>
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namespace aidl::android::hardware::audio::common {
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// Some values are reserved for use by the system code only.
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// HALs must not accept or emit values outside from the provided list.
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constexpr std::array<::aidl::android::media::audio::common::AudioMode, 5> kValidAudioModes = {
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::aidl::android::media::audio::common::AudioMode::NORMAL,
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::aidl::android::media::audio::common::AudioMode::RINGTONE,
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::aidl::android::media::audio::common::AudioMode::IN_CALL,
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::aidl::android::media::audio::common::AudioMode::IN_COMMUNICATION,
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::aidl::android::media::audio::common::AudioMode::CALL_SCREEN,
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};
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constexpr size_t getPcmSampleSizeInBytes(::aidl::android::media::audio::common::PcmType pcm) {
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using ::aidl::android::media::audio::common::PcmType;
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switch (pcm) {
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case PcmType::UINT_8_BIT:
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return 1;
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case PcmType::INT_16_BIT:
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return 2;
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case PcmType::INT_32_BIT:
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return 4;
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case PcmType::FIXED_Q_8_24:
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return 4;
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case PcmType::FLOAT_32_BIT:
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return 4;
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case PcmType::INT_24_BIT:
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return 3;
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}
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return 0;
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}
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constexpr size_t getChannelCount(
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const ::aidl::android::media::audio::common::AudioChannelLayout& layout,
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int32_t mask = std::numeric_limits<int32_t>::max()) {
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using Tag = ::aidl::android::media::audio::common::AudioChannelLayout::Tag;
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switch (layout.getTag()) {
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case Tag::none:
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return 0;
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case Tag::invalid:
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return 0;
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case Tag::indexMask:
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return __builtin_popcount(layout.get<Tag::indexMask>() & mask);
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case Tag::layoutMask:
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return __builtin_popcount(layout.get<Tag::layoutMask>() & mask);
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case Tag::voiceMask:
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return __builtin_popcount(layout.get<Tag::voiceMask>() & mask);
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}
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return 0;
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}
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constexpr size_t getFrameSizeInBytes(
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const ::aidl::android::media::audio::common::AudioFormatDescription& format,
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const ::aidl::android::media::audio::common::AudioChannelLayout& layout) {
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if (format == ::aidl::android::media::audio::common::AudioFormatDescription{}) {
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// Unspecified format.
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return 0;
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}
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using ::aidl::android::media::audio::common::AudioFormatType;
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if (format.type == AudioFormatType::PCM) {
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return getPcmSampleSizeInBytes(format.pcm) * getChannelCount(layout);
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} else if (format.type == AudioFormatType::NON_PCM) {
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// For non-PCM formats always use the underlying PCM size. The default value for
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// PCM is "UINT_8_BIT", thus non-encapsulated streams have the frame size of 1.
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return getPcmSampleSizeInBytes(format.pcm);
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}
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// Something unexpected.
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return 0;
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}
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constexpr bool isDefaultAudioFormat(
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const ::aidl::android::media::audio::common::AudioFormatDescription& desc) {
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return desc.type == ::aidl::android::media::audio::common::AudioFormatType::DEFAULT &&
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desc.pcm == ::aidl::android::media::audio::common::PcmType::DEFAULT;
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}
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constexpr bool isTelephonyDeviceType(
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::aidl::android::media::audio::common::AudioDeviceType device) {
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return device == ::aidl::android::media::audio::common::AudioDeviceType::IN_TELEPHONY_RX ||
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device == ::aidl::android::media::audio::common::AudioDeviceType::OUT_TELEPHONY_TX;
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}
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constexpr bool isUsbInputDeviceType(::aidl::android::media::audio::common::AudioDeviceType type) {
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switch (type) {
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case ::aidl::android::media::audio::common::AudioDeviceType::IN_DOCK:
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case ::aidl::android::media::audio::common::AudioDeviceType::IN_ACCESSORY:
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case ::aidl::android::media::audio::common::AudioDeviceType::IN_DEVICE:
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case ::aidl::android::media::audio::common::AudioDeviceType::IN_HEADSET:
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return true;
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default:
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return false;
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}
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}
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constexpr bool isUsbOutputtDeviceType(::aidl::android::media::audio::common::AudioDeviceType type) {
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switch (type) {
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case ::aidl::android::media::audio::common::AudioDeviceType::OUT_DOCK:
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case ::aidl::android::media::audio::common::AudioDeviceType::OUT_ACCESSORY:
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case ::aidl::android::media::audio::common::AudioDeviceType::OUT_DEVICE:
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case ::aidl::android::media::audio::common::AudioDeviceType::OUT_HEADSET:
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return true;
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default:
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return false;
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}
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}
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constexpr bool isValidAudioMode(::aidl::android::media::audio::common::AudioMode mode) {
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return std::find(kValidAudioModes.begin(), kValidAudioModes.end(), mode) !=
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kValidAudioModes.end();
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}
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static inline bool maybeVendorExtension(const std::string& s) {
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// Only checks whether the string starts with the "vendor prefix".
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static const std::string vendorPrefix = "VX_";
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return s.size() > vendorPrefix.size() && s.substr(0, vendorPrefix.size()) == vendorPrefix;
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}
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static inline bool isVendorExtension(const std::string& s) {
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// Must be the same as defined in {Playback|Record}TrackMetadata.aidl
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static const std::regex vendorExtension("VX_[A-Z0-9]{3,}_[_A-Z0-9]+");
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return std::regex_match(s.begin(), s.end(), vendorExtension);
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}
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// The helper functions defined below are only applicable to the case when an enum type
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// specifies zero-based bit positions, not bit masks themselves. This is why instantiation
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// is restricted to certain enum types.
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template <typename E>
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using is_bit_position_enum = std::integral_constant<
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bool, std::is_same_v<E, ::aidl::android::media::audio::common::AudioInputFlags> ||
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std::is_same_v<E, ::aidl::android::media::audio::common::AudioOutputFlags>>;
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template <typename E, typename U = std::underlying_type_t<E>,
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typename = std::enable_if_t<is_bit_position_enum<E>::value>>
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constexpr U makeBitPositionFlagMask(E flag) {
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return 1 << static_cast<U>(flag);
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}
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template <typename E, typename U = std::underlying_type_t<E>,
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typename = std::enable_if_t<is_bit_position_enum<E>::value>>
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constexpr bool isBitPositionFlagSet(U mask, E flag) {
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return (mask & makeBitPositionFlagMask(flag)) != 0;
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}
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template <typename E, typename U = std::underlying_type_t<E>,
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typename = std::enable_if_t<is_bit_position_enum<E>::value>>
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constexpr U makeBitPositionFlagMask(std::initializer_list<E> flags) {
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U result = 0;
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for (const auto flag : flags) {
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result |= makeBitPositionFlagMask(flag);
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}
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return result;
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}
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} // namespace aidl::android::hardware::audio::common
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