227 lines
6.4 KiB
C++
227 lines
6.4 KiB
C++
#include "./mpegaudioframe.h"
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#include "../exceptions.h"
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#include <c++utilities/conversion/stringbuilder.h>
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#include <c++utilities/conversion/stringconversion.h>
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#include <c++utilities/io/binaryreader.h>
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using namespace std;
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using namespace CppUtilities;
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namespace TagParser {
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/*!
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* \brief Returns the string representation for the specified \a channelMode.
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*/
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std::string_view mpegChannelModeString(MpegChannelMode channelMode)
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{
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switch (channelMode) {
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case MpegChannelMode::Stereo:
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return "2 channels: stereo";
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case MpegChannelMode::JointStereo:
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return "2 channels: joint stereo";
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case MpegChannelMode::DualChannel:
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return "2 channels: dual channel";
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case MpegChannelMode::SingleChannel:
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return "1 channel: single channel";
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default:
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return std::string_view();
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}
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}
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/*!
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* \class TagParser::MpegAudioFrame
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* \brief The MpegAudioFrame class is used to parse MPEG audio frames.
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*/
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const std::uint16_t MpegAudioFrame::s_bitrateTable[0x2][0x3][0xF] = { { { 0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448 },
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{ 0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384 },
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{ 0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320 } },
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{ { 0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256 }, { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160 },
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{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160 } } };
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/*!
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* \brief Parses the header read using the specified \a reader.
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* \throws Throws InvalidDataException if the data read from the stream is
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* no valid frame header.
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*/
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void MpegAudioFrame::parseHeader(BinaryReader &reader, Diagnostics &diag)
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{
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// read MPEG audio frame header
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m_header = reader.readUInt32BE();
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if (!isValid()) {
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diag.emplace_back(DiagLevel::Critical,
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"Frame 0x" % numberToString(m_header, 16u) % " at 0x"
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% numberToString<std::int64_t>(reader.stream()->tellg() - static_cast<std::streamoff>(4), 16)
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+ " is invalid.",
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"parsing MPEG audio frame header");
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throw InvalidDataException();
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}
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// read XING header (see https://www.codeproject.com/Articles/8295/MPEG-Audio-Frame-Header#XINGHeader)
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if (size() < s_xingHeaderOffset - 4 + 8) {
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return;
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}
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reader.stream()->seekg(s_xingHeaderOffset - 4, ios_base::cur);
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m_xingHeader = reader.readUInt64BE();
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if (isXingHeaderAvailable()) {
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m_xingHeaderFlags = static_cast<XingHeaderFlags>(m_xingHeader & 0xffffffffuL);
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if (isXingFramefieldPresent()) {
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m_xingFramefield = reader.readUInt32BE();
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}
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if (isXingBytesfieldPresent()) {
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m_xingBytesfield = reader.readUInt32BE();
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}
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if (isXingTocFieldPresent()) {
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reader.stream()->seekg(64, ios_base::cur);
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}
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if (isXingQualityIndicatorFieldPresent()) {
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m_xingQualityIndicator = reader.readUInt32BE();
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}
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}
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}
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/*!
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* \brief Returns the MPEG version if known (1.0, 2.0 or 2.5); otherwise returns 0.
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*/
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double MpegAudioFrame::mpegVersion() const
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{
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switch (m_header & 0x180000u) {
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case 0x180000u:
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return 1.0;
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case 0x100000u:
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return 2.0;
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case 0x0u:
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return 2.5;
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default:
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return 0.0;
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}
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}
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/*!
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* \brief Returns the MPEG layer if known (1, 2, or 3); otherwise returns 0.
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*/
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int MpegAudioFrame::layer() const
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{
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switch (m_header & 0x60000u) {
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case 0x60000u:
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return 1;
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case 0x40000u:
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return 2;
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case 0x20000u:
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return 3;
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default:
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return 0;
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}
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}
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/*!
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* \brief Returns the sampeling frequency of the frame if known; otherwise returns 0.
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*/
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std::uint32_t MpegAudioFrame::samplingFrequency() const
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{
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switch (m_header & 0xc00u) {
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case 0xc00u:
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return 0;
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case 0x800u:
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switch (m_header & 0x180000u) {
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case 0x180000u:
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return 32000;
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case 0x100000u:
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return 16000;
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case 0x0u:
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return 8000u;
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}
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break;
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case 0x400u:
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switch (m_header & 0x180000u) {
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case 0x180000u:
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return 48000;
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case 0x100000u:
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return 24000;
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case 0x0u:
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return 12000;
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}
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break;
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case 0x0u:
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switch (m_header & 0x180000u) {
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case 0x180000u:
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return 44100;
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case 0x100000:
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return 22050;
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case 0x0u:
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return 11025;
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}
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break;
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}
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return 0;
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}
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/*!
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* \brief Returns the channel mode if known; otherwise returns MpegChannelMode::Unspecifed.
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*/
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MpegChannelMode MpegAudioFrame::channelMode() const
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{
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if (isValid()) {
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switch (m_header & 0xc0u) {
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case 0xc0u:
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return MpegChannelMode::SingleChannel;
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case 0x80u:
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return MpegChannelMode::DualChannel;
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case 0x40u:
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return MpegChannelMode::JointStereo;
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case 0x00:
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return MpegChannelMode::Stereo;
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default:;
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}
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}
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return MpegChannelMode::Unspecifed;
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}
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/*!
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* \brief Returns the sample count if known; otherwise returns 0.
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*/
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std::uint32_t MpegAudioFrame::sampleCount() const
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{
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switch (m_header & 0x60000u) {
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case 0x60000u:
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return 384u;
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case 0x40000u:
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return 1152u;
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case 0x20000u:
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switch (m_header & 0x180000u) {
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case 0x180000u:
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return 1152u;
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case 0x100000u:
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case 0x0u:
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return 576u;
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}
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default:;
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}
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return 0;
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}
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/*!
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* \brief Returns the size if known; otherwise returns 0.
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*/
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std::uint32_t MpegAudioFrame::size() const
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{
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switch (m_header & 0x60000u) {
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case 0x60000u: // layer 1
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return static_cast<std::uint32_t>(
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((static_cast<double>(bitrate()) * 1024.0 / 8.0) / static_cast<double>(samplingFrequency())) * static_cast<double>(sampleCount())
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+ static_cast<double>(paddingSize()))
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* 4;
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case 0x40000u: // layer 2
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case 0x20000u: // layer 3
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return static_cast<std::uint32_t>(
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((static_cast<double>(bitrate()) * 1024.0 / 8.0) / static_cast<double>(samplingFrequency())) * static_cast<double>(sampleCount())
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+ static_cast<double>(paddingSize()));
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default:
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return 0;
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}
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}
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} // namespace TagParser
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