diff options
Diffstat (limited to 'dom/media/AudioConfig.cpp')
| -rw-r--r-- | dom/media/AudioConfig.cpp | 343 |
1 files changed, 343 insertions, 0 deletions
diff --git a/dom/media/AudioConfig.cpp b/dom/media/AudioConfig.cpp new file mode 100644 index 0000000000..cf85f488f7 --- /dev/null +++ b/dom/media/AudioConfig.cpp @@ -0,0 +1,343 @@ +/* -*- 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/. */ + +#include "AudioConfig.h" + +namespace mozilla { + +typedef AudioConfig::ChannelLayout ChannelLayout; + +/** + * AudioConfig::ChannelLayout + */ + +/* + SMPTE channel layout (also known as wave order) + DUAL-MONO L R + DUAL-MONO-LFE L R LFE + MONO M + MONO-LFE M LFE + STEREO L R + STEREO-LFE L R LFE + 3F L R C + 3F-LFE L R C LFE + 2F1 L R S + 2F1-LFE L R LFE S + 3F1 L R C S + 3F1-LFE L R C LFE S + 2F2 L R LS RS + 2F2-LFE L R LFE LS RS + 3F2 L R C LS RS + 3F2-LFE L R C LFE LS RS + 3F3R-LFE L R C LFE BC LS RS + 3F4-LFE L R C LFE Rls Rrs LS RS +*/ + +void AudioConfig::ChannelLayout::UpdateChannelMap() { + mValid = mChannels.Length() <= MAX_CHANNELS; + mChannelMap = UNKNOWN_MAP; + if (mValid) { + mChannelMap = Map(); + mValid = mChannelMap > 0; + } +} + +auto AudioConfig::ChannelLayout::Map() const -> ChannelMap { + if (mChannelMap != UNKNOWN_MAP) { + return mChannelMap; + } + if (mChannels.Length() > MAX_CHANNELS) { + return UNKNOWN_MAP; + } + ChannelMap map = UNKNOWN_MAP; + for (size_t i = 0; i < mChannels.Length(); i++) { + if (uint32_t(mChannels[i]) > sizeof(ChannelMap) * 8) { + return UNKNOWN_MAP; + } + ChannelMap mask = 1 << mChannels[i]; + if (mChannels[i] == CHANNEL_INVALID || (mChannelMap & mask)) { + // Invalid configuration. + return UNKNOWN_MAP; + } + map |= mask; + } + return map; +} + +const AudioConfig::Channel* +AudioConfig::ChannelLayout::DefaultLayoutForChannels(uint32_t aChannels) const { + switch (aChannels) { + case 1: // MONO + { + static const Channel config[] = {CHANNEL_FRONT_CENTER}; + return config; + } + case 2: // STEREO + { + static const Channel config[] = {CHANNEL_FRONT_LEFT, CHANNEL_FRONT_RIGHT}; + return config; + } + case 3: // 3F + { + static const Channel config[] = {CHANNEL_FRONT_LEFT, CHANNEL_FRONT_RIGHT, + CHANNEL_FRONT_CENTER}; + return config; + } + case 4: // QUAD + { + static const Channel config[] = {CHANNEL_FRONT_LEFT, CHANNEL_FRONT_RIGHT, + CHANNEL_BACK_LEFT, CHANNEL_BACK_RIGHT}; + return config; + } + case 5: // 3F2 + { + static const Channel config[] = {CHANNEL_FRONT_LEFT, CHANNEL_FRONT_RIGHT, + CHANNEL_FRONT_CENTER, CHANNEL_SIDE_LEFT, + CHANNEL_SIDE_RIGHT}; + return config; + } + case 6: // 3F2-LFE + { + static const Channel config[] = { + CHANNEL_FRONT_LEFT, CHANNEL_FRONT_RIGHT, CHANNEL_FRONT_CENTER, + CHANNEL_LFE, CHANNEL_SIDE_LEFT, CHANNEL_SIDE_RIGHT}; + return config; + } + case 7: // 3F3R-LFE + { + static const Channel config[] = { + CHANNEL_FRONT_LEFT, CHANNEL_FRONT_RIGHT, CHANNEL_FRONT_CENTER, + CHANNEL_LFE, CHANNEL_BACK_CENTER, CHANNEL_SIDE_LEFT, + CHANNEL_SIDE_RIGHT}; + return config; + } + case 8: // 3F4-LFE + { + static const Channel config[] = { + CHANNEL_FRONT_LEFT, CHANNEL_FRONT_RIGHT, CHANNEL_FRONT_CENTER, + CHANNEL_LFE, CHANNEL_BACK_LEFT, CHANNEL_BACK_RIGHT, + CHANNEL_SIDE_LEFT, CHANNEL_SIDE_RIGHT}; + return config; + } + default: + return nullptr; + } +} + +/* static */ AudioConfig::ChannelLayout +AudioConfig::ChannelLayout::SMPTEDefault(const ChannelLayout& aChannelLayout) { + if (!aChannelLayout.IsValid()) { + return aChannelLayout; + } + return SMPTEDefault(aChannelLayout.Map()); +} + +/* static */ +ChannelLayout AudioConfig::ChannelLayout::SMPTEDefault(ChannelMap aMap) { + // First handle the most common cases. + switch (aMap) { + case LMONO_MAP: + return ChannelLayout{CHANNEL_FRONT_CENTER}; + case LSTEREO_MAP: + return ChannelLayout{CHANNEL_FRONT_LEFT, CHANNEL_FRONT_RIGHT}; + case L3F_MAP: + return ChannelLayout{CHANNEL_FRONT_LEFT, CHANNEL_FRONT_RIGHT, + CHANNEL_FRONT_CENTER}; + case L3F_LFE_MAP: + return ChannelLayout{CHANNEL_FRONT_LEFT, CHANNEL_FRONT_RIGHT, + CHANNEL_FRONT_CENTER, CHANNEL_LFE}; + case L2F1_MAP: + return ChannelLayout{CHANNEL_FRONT_LEFT, CHANNEL_FRONT_RIGHT, + CHANNEL_BACK_CENTER}; + case L2F1_LFE_MAP: + return ChannelLayout{CHANNEL_FRONT_LEFT, CHANNEL_FRONT_RIGHT, CHANNEL_LFE, + CHANNEL_BACK_CENTER}; + case L3F1_MAP: + return ChannelLayout{CHANNEL_FRONT_LEFT, CHANNEL_FRONT_RIGHT, + CHANNEL_FRONT_CENTER, CHANNEL_BACK_CENTER}; + case L3F1_LFE_MAP: + return ChannelLayout{CHANNEL_FRONT_LEFT, CHANNEL_FRONT_RIGHT, + CHANNEL_FRONT_CENTER, CHANNEL_LFE, + CHANNEL_BACK_CENTER}; + case L2F2_MAP: + return ChannelLayout{CHANNEL_FRONT_LEFT, CHANNEL_FRONT_RIGHT, + CHANNEL_SIDE_LEFT, CHANNEL_SIDE_RIGHT}; + case L2F2_LFE_MAP: + return ChannelLayout{CHANNEL_FRONT_LEFT, CHANNEL_FRONT_RIGHT, CHANNEL_LFE, + CHANNEL_SIDE_LEFT, CHANNEL_SIDE_RIGHT}; + case LQUAD_MAP: + return ChannelLayout{CHANNEL_FRONT_LEFT, CHANNEL_FRONT_RIGHT, + CHANNEL_BACK_LEFT, CHANNEL_BACK_RIGHT}; + case LQUAD_LFE_MAP: + return ChannelLayout{CHANNEL_FRONT_LEFT, CHANNEL_FRONT_RIGHT, CHANNEL_LFE, + CHANNEL_BACK_LEFT, CHANNEL_BACK_RIGHT}; + case L3F2_MAP: + return ChannelLayout{CHANNEL_FRONT_LEFT, CHANNEL_FRONT_RIGHT, + CHANNEL_FRONT_CENTER, CHANNEL_SIDE_LEFT, + CHANNEL_SIDE_RIGHT}; + case L3F2_LFE_MAP: + return ChannelLayout{CHANNEL_FRONT_LEFT, CHANNEL_FRONT_RIGHT, + CHANNEL_FRONT_CENTER, CHANNEL_LFE, + CHANNEL_SIDE_LEFT, CHANNEL_SIDE_RIGHT}; + case L3F2_BACK_MAP: + return ChannelLayout{CHANNEL_FRONT_LEFT, CHANNEL_FRONT_RIGHT, + CHANNEL_FRONT_CENTER, CHANNEL_BACK_LEFT, + CHANNEL_BACK_RIGHT}; + case L3F2_BACK_LFE_MAP: + return ChannelLayout{CHANNEL_FRONT_LEFT, CHANNEL_FRONT_RIGHT, + CHANNEL_FRONT_CENTER, CHANNEL_LFE, + CHANNEL_BACK_LEFT, CHANNEL_BACK_RIGHT}; + case L3F3R_LFE_MAP: + return ChannelLayout{CHANNEL_FRONT_LEFT, CHANNEL_FRONT_RIGHT, + CHANNEL_FRONT_CENTER, CHANNEL_LFE, + CHANNEL_BACK_CENTER, CHANNEL_SIDE_LEFT, + CHANNEL_SIDE_RIGHT}; + case L3F4_LFE_MAP: + return ChannelLayout{CHANNEL_FRONT_LEFT, CHANNEL_FRONT_RIGHT, + CHANNEL_FRONT_CENTER, CHANNEL_LFE, + CHANNEL_BACK_LEFT, CHANNEL_BACK_RIGHT, + CHANNEL_SIDE_LEFT, CHANNEL_SIDE_RIGHT}; + default: + break; + } + + static_assert(MAX_CHANNELS <= sizeof(ChannelMap) * 8, + "Must be able to fit channels on bit mask"); + AutoTArray<Channel, MAX_CHANNELS> layout; + uint32_t channels = 0; + + uint32_t i = 0; + while (aMap) { + if (aMap & 1) { + channels++; + if (channels > MAX_CHANNELS) { + return ChannelLayout(); + } + layout.AppendElement(static_cast<Channel>(i)); + } + aMap >>= 1; + i++; + } + return ChannelLayout(channels, layout.Elements()); +} + +bool AudioConfig::ChannelLayout::MappingTable(const ChannelLayout& aOther, + nsTArray<uint8_t>* aMap) const { + if (!IsValid() || !aOther.IsValid() || Map() != aOther.Map()) { + if (aMap) { + aMap->SetLength(0); + } + return false; + } + if (!aMap) { + return true; + } + aMap->SetLength(Count()); + for (uint32_t i = 0; i < Count(); i++) { + for (uint32_t j = 0; j < Count(); j++) { + if (aOther[j] == mChannels[i]) { + (*aMap)[j] = i; + break; + } + } + } + return true; +} + +/** + * AudioConfig::ChannelConfig + */ + +/* static */ const char* AudioConfig::FormatToString( + AudioConfig::SampleFormat aFormat) { + switch (aFormat) { + case FORMAT_U8: + return "unsigned 8 bit"; + case FORMAT_S16: + return "signed 16 bit"; + case FORMAT_S24: + return "signed 24 bit MSB"; + case FORMAT_S24LSB: + return "signed 24 bit LSB"; + case FORMAT_S32: + return "signed 32 bit"; + case FORMAT_FLT: + return "32 bit floating point"; + case FORMAT_NONE: + return "none"; + default: + return "unknown"; + } +} +/* static */ +uint32_t AudioConfig::SampleSize(AudioConfig::SampleFormat aFormat) { + switch (aFormat) { + case FORMAT_U8: + return 1; + case FORMAT_S16: + return 2; + case FORMAT_S24: + [[fallthrough]]; + case FORMAT_S24LSB: + [[fallthrough]]; + case FORMAT_S32: + [[fallthrough]]; + case FORMAT_FLT: + return 4; + case FORMAT_NONE: + default: + return 0; + } +} + +/* static */ +uint32_t AudioConfig::FormatToBits(AudioConfig::SampleFormat aFormat) { + switch (aFormat) { + case FORMAT_U8: + return 8; + case FORMAT_S16: + return 16; + case FORMAT_S24LSB: + [[fallthrough]]; + case FORMAT_S24: + return 24; + case FORMAT_S32: + [[fallthrough]]; + case FORMAT_FLT: + return 32; + case FORMAT_NONE: + [[fallthrough]]; + default: + return 0; + } +} + +AudioConfig::AudioConfig(const ChannelLayout& aChannelLayout, uint32_t aRate, + AudioConfig::SampleFormat aFormat, bool aInterleaved) + : mChannelLayout(aChannelLayout), + mChannels(aChannelLayout.Count()), + mRate(aRate), + mFormat(aFormat), + mInterleaved(aInterleaved) {} + +AudioConfig::AudioConfig(const ChannelLayout& aChannelLayout, + uint32_t aChannels, uint32_t aRate, + AudioConfig::SampleFormat aFormat, bool aInterleaved) + : mChannelLayout(aChannelLayout), + mChannels(aChannels), + mRate(aRate), + mFormat(aFormat), + mInterleaved(aInterleaved) {} + +AudioConfig::AudioConfig(uint32_t aChannels, uint32_t aRate, + AudioConfig::SampleFormat aFormat, bool aInterleaved) + : mChannelLayout(aChannels), + mChannels(aChannels), + mRate(aRate), + mFormat(aFormat), + mInterleaved(aInterleaved) {} + +} // namespace mozilla |