42 lines
1.2 KiB
C++
42 lines
1.2 KiB
C++
#include "./adtsstream.h"
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#include "../mp4/mp4ids.h"
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#include "../exceptions.h"
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#include <string>
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using namespace std;
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namespace Media {
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/*!
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* \class Media::AdtsStream
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* \brief Implementation of Media::AbstractTrack for ADTS streams.
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*/
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void AdtsStream::internalParseHeader()
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{
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//static const string context("parsing ADTS frame header");
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if(!m_istream) {
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throw NoDataFoundException();
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}
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// get size
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m_istream->seekg(-128, ios_base::end);
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if(m_reader.readUInt24BE() == 0x544147) {
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m_size = static_cast<uint64>(m_istream->tellg()) - 3u - m_startOffset;
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} else {
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m_size = static_cast<uint64>(m_istream->tellg()) + 125u - m_startOffset;
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}
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m_istream->seekg(m_startOffset, ios_base::beg);
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// parse frame header
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m_firstFrame.parseHeader(m_reader);
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m_format = Mpeg4AudioObjectIds::idToMediaFormat(m_firstFrame.mpeg4AudioObjectId());
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m_channelCount = Mpeg4ChannelConfigs::channelCount(m_channelConfig = m_firstFrame.mpeg4ChannelConfig());
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byte sampleRateIndex = m_firstFrame.mpeg4SamplingFrequencyIndex();
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m_samplingFrequency = sampleRateIndex < sizeof(mpeg4SamplingFrequencyTable) ? mpeg4SamplingFrequencyTable[sampleRateIndex] : 0;
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}
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} // namespace Media
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