2015-09-06 19:57:33 +02:00
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#include "./waveaudiostream.h"
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2015-04-22 19:22:01 +02:00
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2015-09-22 01:37:23 +02:00
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#include "../mpegaudio/mpegaudioframestream.h"
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2015-09-06 19:57:33 +02:00
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#include "../exceptions.h"
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#include "../mediaformat.h"
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2015-04-22 19:22:01 +02:00
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2015-09-23 00:03:05 +02:00
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#include <c++utilities/conversion/stringconversion.h>
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2018-03-07 01:17:50 +01:00
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#include <c++utilities/io/binaryreader.h>
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2015-06-12 02:35:50 +02:00
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2015-04-22 19:22:01 +02:00
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using namespace std;
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using namespace ChronoUtilities;
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2018-03-06 23:09:15 +01:00
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namespace TagParser {
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2015-06-12 02:35:50 +02:00
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/*!
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* \class Media::WaveFormatHeader
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* \brief The WaveFormatHeader class parses the WAVEFORMATEX structure defined by MS.
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*/
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/*!
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* \brief Constructs a new WaveFormatHeader.
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*/
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2018-03-07 01:17:50 +01:00
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WaveFormatHeader::WaveFormatHeader()
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: formatTag(0)
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, channelCount(0)
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, sampleRate(0)
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, bytesPerSecond(0)
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, chunkSize(0)
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, bitsPerSample(0)
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{
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}
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/*!
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* \brief Parses the WAVE "fmt " header segment using the specified \a reader.
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* \remarks Reads 16 bytes from the associated stream.
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*/
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void WaveFormatHeader::parse(IoUtilities::BinaryReader &reader)
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{
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formatTag = reader.readUInt16LE();
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channelCount = reader.readUInt16LE();
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sampleRate = reader.readUInt32LE();
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bytesPerSecond = reader.readUInt32LE();
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chunkSize = reader.readUInt16LE();
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bitsPerSample = reader.readUInt16LE();
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}
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/*!
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* \brief Returns the media format denoted by the format tag.
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*/
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MediaFormat WaveFormatHeader::format() const
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{
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switch (formatTag) {
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case 0x0001u:
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return GeneralMediaFormat::Pcm;
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case 0x0050u:
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return MediaFormat(GeneralMediaFormat::Mpeg1Audio, SubFormats::Mpeg1Layer2);
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case 0x0055u:
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return MediaFormat(GeneralMediaFormat::Mpeg1Audio, SubFormats::Mpeg1Layer3);
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default:
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return GeneralMediaFormat::Unknown;
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}
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}
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/*!
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* \class Media::WaveAudioStream
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* \brief Implementation of Media::AbstractTrack for the
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* RIFF WAVE container format.
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*/
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/*!
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* \brief Constructs a new track for the \a stream at the specified \a startOffset.
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*/
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WaveAudioStream::WaveAudioStream(iostream &stream, uint64 startOffset)
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: AbstractTrack(stream, startOffset)
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, m_dataOffset(0)
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{
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m_mediaType = MediaType::Audio;
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}
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/*!
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* \brief Destroys the track.
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*/
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WaveAudioStream::~WaveAudioStream()
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{
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}
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TrackType WaveAudioStream::type() const
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{
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return TrackType::WaveAudioStream;
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}
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2015-06-12 02:35:50 +02:00
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/*!
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* \brief Adds the information from the specified \a waveHeader to the specified \a track.
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*/
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void WaveAudioStream::addInfo(const WaveFormatHeader &waveHeader, AbstractTrack &track)
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{
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track.m_format = waveHeader.format();
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track.m_formatId = ConversionUtilities::numberToString(waveHeader.formatTag);
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track.m_channelCount = waveHeader.channelCount;
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track.m_samplingFrequency = waveHeader.sampleRate;
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track.m_bytesPerSecond = waveHeader.bytesPerSecond;
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track.m_chunkSize = waveHeader.chunkSize;
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track.m_bitsPerSample = waveHeader.bitsPerSample;
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track.m_bitrate = waveHeader.bitrate();
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}
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2018-03-05 17:49:29 +01:00
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void WaveAudioStream::internalParseHeader(Diagnostics &diag)
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{
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const string context("parsing RIFF/WAVE header");
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if (!m_istream) {
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throw NoDataFoundException();
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}
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if (m_reader.readUInt32BE() != 0x52494646u) {
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throw NoDataFoundException();
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}
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m_istream->seekg(m_startOffset + 8);
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if (m_reader.readUInt32BE() != 0x57415645u) {
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throw NoDataFoundException();
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}
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while (!m_dataOffset) {
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uint32 segmentId = m_reader.readUInt32BE();
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uint32 restHeaderLen = m_reader.readUInt32LE();
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switch (segmentId) {
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case 0x666D7420u:
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if (restHeaderLen >= 16u) {
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WaveFormatHeader waveHeader;
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waveHeader.parse(m_reader);
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addInfo(waveHeader, *this);
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restHeaderLen -= 16u;
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} else {
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diag.emplace_back(DiagLevel::Warning, "\"fmt \" segment is truncated.", context);
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}
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break;
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case 0x64617461u:
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m_dataOffset = m_istream->tellg();
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m_size = restHeaderLen;
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m_sampleCount = m_size / m_chunkSize;
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m_duration = TimeSpan::fromSeconds(static_cast<double>(m_sampleCount) / static_cast<double>(m_samplingFrequency));
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break;
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default:;
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}
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m_istream->seekg(restHeaderLen, ios_base::cur);
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}
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if (m_format.general != GeneralMediaFormat::Mpeg1Audio || !m_dataOffset) {
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return;
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}
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m_istream->seekg(m_dataOffset);
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MpegAudioFrame frame;
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frame.parseHeader(m_reader);
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MpegAudioFrameStream::addInfo(frame, *this);
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m_bitrate = frame.isXingFramefieldPresent()
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? ((static_cast<double>(m_size) * 8.0)
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/ (static_cast<double>(frame.xingFrameCount() * frame.sampleCount()) / static_cast<double>(frame.samplingFrequency())) / 1024.0)
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: frame.bitrate();
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m_bytesPerSecond = m_bitrate * 125;
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m_duration = TimeSpan::fromSeconds(static_cast<double>(m_size) / (m_bitrate * 128.0));
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}
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2018-03-07 01:17:50 +01:00
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} // namespace TagParser
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