XWV.cpp

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// ReSharper disable CppRedundantQualifier
 
#include <sndpp/XWV.h>
 
#include <BufferStream.h>
#include <sourcepp/FS.h>
 
using namespace sndpp;
using namespace sourcepp;
 
namespace {

[[nodiscard]] constexpr uint64_t xmaBytesToSamples(uint64_t bytes, uint8_t channels) {
    const auto blockAlign = channels * 0x24;
    const auto mod = bytes % blockAlign;
    return bytes / blockAlign * (blockAlign - 4 * channels) * 2 / channels + (mod > 0 && mod > 0x04 * channels ? (mod - 0x04*channels) * 2 / channels : 0);
}
 
} // namespace
 
XWV::XWV(std::span<const std::byte> xwvData)
        : version{Version::V0}
        , loopStart{-1}
        , format{Format::PCM} {
    BufferStreamReadOnly stream{xwvData};
 
    switch (stream >> this->version; this->version) {
        case Version::V0: {
            const auto dataLength = stream.read<uint32_t>();
            const auto dataOffset = stream.read<uint32_t>();
            this->audioData = stream.at_bytes(dataLength, dataOffset);
 
            stream >> this->loopStart;
 
            if (const auto valveDataLength = stream.read<uint16_t>()) {
                this->valveData = stream.at_bytes(valveDataLength, sizeof(uint32_t) * 3 + sizeof(int32_t) + sizeof(uint8_t) * 4);
            }
 
            stream >> this->format;
 
            const auto packed = stream.read<uint8_t>();
            this->frequency = static_cast<Frequency>(packed & 0x0f);
            this->channelCount = packed >> 4;
 
            // Fill in new values
            this->leadingSampleCount = 0;
            this->trailingSampleCount = 0;
            this->quality = 63; // useless?
 
            this->loopBlock = 0; // used in XMA2
            if (this->format == Format::PCM) {
                this->bitsPerSample = 16;
                this->decodedSampleCount = this->audioData.size() / this->channelCount / sizeof(int16_t);
            } else {
                this->bitsPerSample = 4;
                this->decodedSampleCount = ::xmaBytesToSamples(this->audioData.size(), this->channelCount);
            }
            break;
        }
        case Version::V1: {
            const auto headerSize = stream.read<uint32_t>();
            if (headerSize != sizeof(uint32_t) * 4 + sizeof(int32_t) + sizeof(uint16_t) + sizeof(uint8_t) * 4) {
                return;
            }
 
            const auto dataLength = stream.read<uint32_t>();
            const auto dataOffset = stream.read<uint32_t>();
            this->audioData = stream.at_bytes(dataLength, dataOffset);
 
            stream >> this->loopStart;
 
            if (const auto valveDataLength = stream.read<uint16_t>()) {
                this->valveData = stream.at_bytes(valveDataLength, headerSize);
            }
 
            stream >> this->format >> this->bitsPerSample;
 
            const auto packed = stream.read<uint8_t>();
            this->frequency = static_cast<Frequency>(packed & 0x0f);
            this->channelCount = packed >> 4;
 
            // Fill in new values
            this->leadingSampleCount = 0;
            this->trailingSampleCount = 0;
            this->quality = 63; // useless?
 
            this->loopBlock = 0; // used in XMA2
            if (this->format == Format::PCM) {
                this->decodedSampleCount = this->audioData.size() / this->channelCount / sizeof(int16_t);
            } else {
                this->decodedSampleCount = ::xmaBytesToSamples(this->audioData.size(), this->channelCount);
            }
            break;
        }
        case Version::V4: {
            stream.set_big_endian(true);
            if (stream.read<uint32_t>() != 4) {
                return;
            }
 
            const auto headerSize = stream.read<uint32_t>();
            if (headerSize != sizeof(uint32_t) * 7 + sizeof(int32_t) + sizeof(uint16_t) * 4 + sizeof(uint8_t) * 8) {
                return;
            }
 
            const auto staticDataSize = stream.read<uint32_t>();
            this->staticData = stream.at_bytes(staticDataSize, headerSize);
 
            const auto dataOffset = stream.read<uint32_t>();
            const auto dataLength = stream.read<uint32_t>();
            this->audioData = stream.at_bytes(dataLength, dataOffset);
 
            stream >> this->decodedSampleCount >> this->loopStart >> this->loopBlock >> this->leadingSampleCount >> this->trailingSampleCount;
 
            if (const auto valveDataLength = stream.read<uint16_t>()) {
                this->valveData = stream.at_bytes(valveDataLength, headerSize);
            }
 
            stream >> this->format;
            if (this->format == Format::XMA) {
                // This format uses the same index as XMA, we need to remap it so the enum entries are different here
                this->format = Format::XMA2;
            }
 
            stream >> this->bitsPerSample >> this->frequency >> this->channelCount >> this->quality;
 
            if (stream.read<uint8_t>()) {
                this->seekTable = stream.read_bytes(this->audioData.size() * sizeof(uint32_t) / 2048);
            }
            break;
        }
    }
    this->opened = true;
}
 
XWV::XWV(const std::filesystem::path& xwvPath)
        : XWV(fs::readFileBuffer(xwvPath)) {}
 
XWV::operator bool() const {
    return this->opened;
}
 
XWV::Version XWV::getVersion() const {
    return this->version;
}
 
const std::vector<std::byte>& XWV::getAudioDataRaw() const {
    return this->audioData;
}
 
const std::vector<std::byte>& XWV::getStaticData() const {
    return this->staticData;
}
 
const std::vector<std::byte>& XWV::getValveData() const {
    return this->valveData;
}
 
const std::vector<std::byte>& XWV::getSeekTableData() const {
    return this->seekTable;
}
 
uint32_t XWV::getDecodedSampleCount() const {
    return this->decodedSampleCount;
}
 
int32_t XWV::getLoopStart() const {
    return this->loopStart;
}
 
uint16_t XWV::getLoopBlock() const {
    return this->loopBlock;
}
 
uint16_t XWV::getLeadingSampleCount() const {
    return this->leadingSampleCount;
}
 
uint16_t XWV::getTrailingSampleCount() const {
    return this->trailingSampleCount;
}
 
XWV::Format XWV::getFormat() const {
    return this->format;
}
 
uint8_t XWV::getBitsPerSample() const {
    return this->bitsPerSample;
}
 
XWV::Frequency XWV::getFrequency() const {
    return this->frequency;
}
 
uint8_t XWV::getChannelCount() const {
    return this->channelCount;
}
 
uint8_t XWV::getQuality() const {
    return this->quality;
}