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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#if !defined(AudioLayout_h)
# define AudioLayout_h
# include <cstdint>
# include <initializer_list>
# include "mozilla/MathAlgorithms.h"
# include "nsTArray.h"
namespace mozilla {
class AudioConfig {
public:
// Channel definition is conveniently defined to be in the same order as
// WAVEFORMAT && SMPTE, even though this is unused for now.
enum Channel {
CHANNEL_INVALID = -1,
CHANNEL_FRONT_LEFT = 0,
CHANNEL_FRONT_RIGHT,
CHANNEL_FRONT_CENTER,
CHANNEL_LFE,
CHANNEL_BACK_LEFT,
CHANNEL_BACK_RIGHT,
CHANNEL_FRONT_LEFT_OF_CENTER,
CHANNEL_FRONT_RIGHT_OF_CENTER,
CHANNEL_BACK_CENTER,
CHANNEL_SIDE_LEFT,
CHANNEL_SIDE_RIGHT,
// From WAVEFORMAT definition.
CHANNEL_TOP_CENTER,
CHANNEL_TOP_FRONT_LEFT,
CHANNEL_TOP_FRONT_CENTER,
CHANNEL_TOP_FRONT_RIGHT,
CHANNEL_TOP_BACK_LEFT,
CHANNEL_TOP_BACK_CENTER,
CHANNEL_TOP_BACK_RIGHT
};
class ChannelLayout {
public:
// The maximum number of channels a channel map can represent.
static constexpr uint32_t MAX_CHANNELS = 32;
typedef uint32_t ChannelMap;
ChannelLayout() : mChannelMap(UNKNOWN_MAP), mValid(false) {}
explicit ChannelLayout(uint32_t aChannels)
: ChannelLayout(aChannels, DefaultLayoutForChannels(aChannels)) {}
ChannelLayout(uint32_t aChannels, const Channel* aConfig)
: ChannelLayout() {
if (aChannels == 0 || !aConfig) {
return;
}
mChannels.AppendElements(aConfig, aChannels);
UpdateChannelMap();
}
explicit ChannelLayout(std::initializer_list<Channel> aChannelList)
: ChannelLayout(aChannelList.size(), aChannelList.begin()) {}
bool operator==(const ChannelLayout& aOther) const {
return mChannels == aOther.mChannels;
}
bool operator!=(const ChannelLayout& aOther) const {
return mChannels != aOther.mChannels;
}
const Channel& operator[](uint32_t aIndex) const {
MOZ_ASSERT(mChannels.Length() > aIndex);
return mChannels[aIndex];
}
uint32_t Count() const { return mChannels.Length(); }
ChannelMap Map() const;
// Calculate the mapping table from the current layout to aOther such that
// one can easily go from one layout to the other by doing:
// out[channel] = in[map[channel]].
// Returns true if the reordering is possible or false otherwise.
// If true, then aMap, if set, will be updated to contain the mapping table
// allowing conversion from the current layout to aOther.
// If aMap is empty, then MappingTable can be used to simply determine if
// the current layout can be easily reordered to aOther.
bool MappingTable(const ChannelLayout& aOther,
nsTArray<uint8_t>* aMap = nullptr) const;
bool IsValid() const { return mValid; }
bool HasChannel(Channel aChannel) const {
return mChannelMap & (1 << aChannel);
}
// Return the number of channels found in this ChannelMap.
static uint32_t Channels(ChannelMap aMap) {
static_assert(sizeof(ChannelMap) == sizeof(uint32_t),
"Must adjust ChannelMap type");
return CountPopulation32(aMap);
}
static ChannelLayout SMPTEDefault(const ChannelLayout& aChannelLayout);
static ChannelLayout SMPTEDefault(ChannelMap aMap);
static constexpr ChannelMap UNKNOWN_MAP = 0;
// Common channel layout definitions.
static constexpr ChannelMap LMONO_MAP = 1 << CHANNEL_FRONT_CENTER;
static constexpr ChannelMap LMONO_LFE_MAP =
1 << CHANNEL_FRONT_CENTER | 1 << CHANNEL_LFE;
static constexpr ChannelMap LSTEREO_MAP =
1 << CHANNEL_FRONT_LEFT | 1 << CHANNEL_FRONT_RIGHT;
static constexpr ChannelMap LSTEREO_LFE_MAP =
1 << CHANNEL_FRONT_LEFT | 1 << CHANNEL_FRONT_RIGHT | 1 << CHANNEL_LFE;
static constexpr ChannelMap L3F_MAP = 1 << CHANNEL_FRONT_LEFT |
1 << CHANNEL_FRONT_RIGHT |
1 << CHANNEL_FRONT_CENTER;
static constexpr ChannelMap L3F_LFE_MAP =
1 << CHANNEL_FRONT_LEFT | 1 << CHANNEL_FRONT_RIGHT |
1 << CHANNEL_FRONT_CENTER | 1 << CHANNEL_LFE;
static constexpr ChannelMap L2F1_MAP = 1 << CHANNEL_FRONT_LEFT |
1 << CHANNEL_FRONT_RIGHT |
1 << CHANNEL_BACK_CENTER;
static constexpr ChannelMap L2F1_LFE_MAP =
1 << CHANNEL_FRONT_LEFT | 1 << CHANNEL_FRONT_RIGHT | 1 << CHANNEL_LFE |
1 << CHANNEL_BACK_CENTER;
static constexpr ChannelMap L3F1_MAP =
1 << CHANNEL_FRONT_LEFT | 1 << CHANNEL_FRONT_RIGHT |
1 << CHANNEL_FRONT_CENTER | 1 << CHANNEL_BACK_CENTER;
static constexpr ChannelMap LSURROUND_MAP = L3F1_MAP;
static constexpr ChannelMap L3F1_LFE_MAP =
1 << CHANNEL_FRONT_LEFT | 1 << CHANNEL_FRONT_RIGHT |
1 << CHANNEL_FRONT_CENTER | 1 << CHANNEL_LFE | 1 << CHANNEL_BACK_CENTER;
static constexpr ChannelMap L2F2_MAP =
1 << CHANNEL_FRONT_LEFT | 1 << CHANNEL_FRONT_RIGHT |
1 << CHANNEL_SIDE_LEFT | 1 << CHANNEL_SIDE_RIGHT;
static constexpr ChannelMap L2F2_LFE_MAP =
1 << CHANNEL_FRONT_LEFT | 1 << CHANNEL_FRONT_RIGHT | 1 << CHANNEL_LFE |
1 << CHANNEL_SIDE_LEFT | 1 << CHANNEL_SIDE_RIGHT;
static constexpr ChannelMap LQUAD_MAP =
1 << CHANNEL_FRONT_LEFT | 1 << CHANNEL_FRONT_RIGHT |
1 << CHANNEL_BACK_LEFT | 1 << CHANNEL_BACK_RIGHT;
static constexpr ChannelMap LQUAD_LFE_MAP =
1 << CHANNEL_FRONT_LEFT | 1 << CHANNEL_FRONT_RIGHT | 1 << CHANNEL_LFE |
1 << CHANNEL_BACK_LEFT | 1 << CHANNEL_BACK_RIGHT;
static constexpr ChannelMap L3F2_MAP =
1 << CHANNEL_FRONT_LEFT | 1 << CHANNEL_FRONT_RIGHT |
1 << CHANNEL_FRONT_CENTER | 1 << CHANNEL_SIDE_LEFT |
1 << CHANNEL_SIDE_RIGHT;
static constexpr ChannelMap L3F2_LFE_MAP =
1 << CHANNEL_FRONT_LEFT | 1 << CHANNEL_FRONT_RIGHT |
1 << CHANNEL_FRONT_CENTER | 1 << CHANNEL_LFE | 1 << CHANNEL_SIDE_LEFT |
1 << CHANNEL_SIDE_RIGHT;
// 3F2_LFE Alias
static constexpr ChannelMap L5POINT1_SURROUND_MAP = L3F2_LFE_MAP;
static constexpr ChannelMap L3F2_BACK_MAP =
1 << CHANNEL_FRONT_LEFT | 1 << CHANNEL_FRONT_RIGHT |
1 << CHANNEL_FRONT_CENTER | 1 << CHANNEL_BACK_LEFT |
1 << CHANNEL_BACK_RIGHT;
static constexpr ChannelMap L3F2_BACK_LFE_MAP =
L3F2_BACK_MAP | 1 << CHANNEL_LFE;
static constexpr ChannelMap L3F3R_LFE_MAP =
1 << CHANNEL_FRONT_LEFT | 1 << CHANNEL_FRONT_RIGHT |
1 << CHANNEL_FRONT_CENTER | 1 << CHANNEL_LFE |
1 << CHANNEL_BACK_CENTER | 1 << CHANNEL_SIDE_LEFT |
1 << CHANNEL_SIDE_RIGHT;
static ChannelLayout L3F4_LFE;
static constexpr ChannelMap L3F4_LFE_MAP =
1 << CHANNEL_FRONT_LEFT | 1 << CHANNEL_FRONT_RIGHT |
1 << CHANNEL_FRONT_CENTER | 1 << CHANNEL_LFE | 1 << CHANNEL_BACK_LEFT |
1 << CHANNEL_BACK_RIGHT | 1 << CHANNEL_SIDE_LEFT |
1 << CHANNEL_SIDE_RIGHT;
// 3F4_LFE Alias
static ChannelLayout L7POINT1_SURROUND;
static constexpr ChannelMap L7POINT1_SURROUND_MAP = L3F4_LFE_MAP;
private:
void UpdateChannelMap();
const Channel* DefaultLayoutForChannels(uint32_t aChannels) const;
CopyableAutoTArray<Channel, MAX_CHANNELS> mChannels;
ChannelMap mChannelMap;
bool mValid;
};
enum SampleFormat {
FORMAT_NONE = 0,
FORMAT_U8,
FORMAT_S16,
FORMAT_S24LSB,
FORMAT_S24,
FORMAT_S32,
FORMAT_FLT,
# if defined(MOZ_SAMPLE_TYPE_FLOAT32)
FORMAT_DEFAULT = FORMAT_FLT
# elif defined(MOZ_SAMPLE_TYPE_S16)
FORMAT_DEFAULT = FORMAT_S16
# else
# error "Not supported audio type"
# endif
};
AudioConfig(const ChannelLayout& aChannelLayout, uint32_t aRate,
AudioConfig::SampleFormat aFormat = FORMAT_DEFAULT,
bool aInterleaved = true);
AudioConfig(const ChannelLayout& aChannelLayout, uint32_t aChannels,
uint32_t aRate,
AudioConfig::SampleFormat aFormat = FORMAT_DEFAULT,
bool aInterleaved = true);
// Will create a channel configuration from default SMPTE ordering.
AudioConfig(uint32_t aChannels, uint32_t aRate,
AudioConfig::SampleFormat aFormat = FORMAT_DEFAULT,
bool aInterleaved = true);
const ChannelLayout& Layout() const { return mChannelLayout; }
uint32_t Channels() const {
if (!mChannelLayout.IsValid()) {
return mChannels;
}
return mChannelLayout.Count();
}
uint32_t Rate() const { return mRate; }
SampleFormat Format() const { return mFormat; }
bool Interleaved() const { return mInterleaved; }
bool operator==(const AudioConfig& aOther) const {
return mChannelLayout == aOther.mChannelLayout && mRate == aOther.mRate &&
mFormat == aOther.mFormat && mInterleaved == aOther.mInterleaved;
}
bool operator!=(const AudioConfig& aOther) const {
return !(*this == aOther);
}
bool IsValid() const {
return mChannelLayout.IsValid() && Format() != FORMAT_NONE && Rate() > 0;
}
static const char* FormatToString(SampleFormat aFormat);
static uint32_t SampleSize(SampleFormat aFormat);
static uint32_t FormatToBits(SampleFormat aFormat);
private:
// Channels configuration.
ChannelLayout mChannelLayout;
// Channel count.
uint32_t mChannels;
// Sample rate.
uint32_t mRate;
// Sample format.
SampleFormat mFormat;
bool mInterleaved;
};
} // namespace mozilla
#endif // AudioLayout_h