130 lines
3.7 KiB
C++
130 lines
3.7 KiB
C++
#include "waveaudiostream.h"
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#include "tagparser/exceptions.h"
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#include "tagparser/mediaformat.h"
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#include <c++utilities/io/binaryreader.h>
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using namespace std;
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namespace Media {
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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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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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* \brief Parses the WAVE header 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: return GeneralMediaFormat::Pcm;
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case 0x0050u: return MediaFormat(GeneralMediaFormat::Mpeg1Audio, SubFormats::Mpeg1Layer2);
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case 0x0055u: return MediaFormat(GeneralMediaFormat::Mpeg1Audio, SubFormats::Mpeg1Layer3);
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default: 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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{
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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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TrackType WaveAudioStream::type() const
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{
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return TrackType::WaveAudioStream;
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}
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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_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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void WaveAudioStream::internalParseHeader()
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{
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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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m_istream->seekg(4, ios_base::cur);
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if(m_reader.readUInt32BE() == 0x57415645u && m_reader.readUInt32BE() == 0x666D7420u) {
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uint32 restHeaderLen = m_reader.readUInt32LE();
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m_dataOffset = static_cast<uint64>(m_istream->tellg()) + static_cast<uint64>(restHeaderLen);
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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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}
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if(restHeaderLen > 16u) {
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m_istream->seekg(m_dataOffset, ios_base::beg);
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}
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if(m_reader.readUInt32BE() == 0x64617461u) {
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m_size = m_reader.readUInt32LE();
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m_sampleCount = m_size / m_chunkSize;
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m_duration = ChronoUtilities::TimeSpan::fromSeconds(static_cast<double>(m_sampleCount) / static_cast<double>(m_samplingFrequency));
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} else {
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throw NoDataFoundException();
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}
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} else {
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throw NoDataFoundException();
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}
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} else {
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throw NoDataFoundException();
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}
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}
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}
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