88 lines
2.8 KiB
C++
88 lines
2.8 KiB
C++
#include "waveaudiostream.h"
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#include "../exceptions.h"
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#include "../mediaformat.h"
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using namespace std;
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namespace Media {
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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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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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switch(m_reader.readUInt16LE()) {
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case 0x0001u:
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m_format = GeneralMediaFormat::Pcm;
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break;
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case 0x0050u:
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m_format = MediaFormat(GeneralMediaFormat::Mpeg1Audio, SubFormats::Mpeg1Layer2);
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break;
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case 0x0055u:
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m_format = MediaFormat(GeneralMediaFormat::Mpeg1Audio, SubFormats::Mpeg1Layer3);
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break;
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default:
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m_format = GeneralMediaFormat::Unknown;
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}
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m_channelCount = m_reader.readUInt16LE();
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m_samplesPerSecond = m_reader.readUInt32LE();
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m_bytesPerSecond = m_reader.readUInt32LE();
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m_chunkSize = m_reader.readUInt16LE();
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m_bitsPerSample = m_reader.readUInt16LE();
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m_bitrate = m_bitsPerSample * m_samplesPerSecond * m_channelCount;
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} else {
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m_format = GeneralMediaFormat::Unknown;
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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_samplesPerSecond));
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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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