2 Copyright (c) 2004-2011, John Hurst
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6 modification, are permitted provided that the following conditions
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27 /*! \file PCM_Parser.cpp
29 \brief AS-DCP library, PCM raw essence reader implementation
35 using Kumu::DefaultLogSink;
37 using namespace ASDCP;
38 using namespace ASDCP::PCM;
39 using namespace ASDCP::Wav;
40 using namespace ASDCP::RF64;
43 //------------------------------------------------------------------------------------------
46 class ASDCP::PCM::WAVParser::h__WAVParser
48 Kumu::FileReader m_FileReader;
53 ui32_t m_FrameBufferSize;
55 Rational m_PictureRate;
57 ASDCP_NO_COPY_CONSTRUCT(h__WAVParser);
60 AudioDescriptor m_ADesc;
64 m_EOF(false), m_DataStart(0), m_DataLength(0), m_ReadCount(0),
65 m_FrameBufferSize(0), m_FramesRead(0) {}
72 Result_t OpenRead(const std::string& filename, const Rational& PictureRate);
75 Result_t ReadFrame(FrameBuffer&);
81 ASDCP::PCM::WAVParser::h__WAVParser::Close()
88 ASDCP::PCM::WAVParser::h__WAVParser::Reset()
90 m_FileReader.Seek(m_DataStart);
97 ASDCP::PCM::WAVParser::h__WAVParser::OpenRead(const std::string& filename, const Rational& PictureRate)
99 Result_t result = m_FileReader.OpenRead(filename);
101 if ( ASDCP_SUCCESS(result) )
103 SimpleWaveHeader WavHeader;
104 result = WavHeader.ReadFromFile(m_FileReader, &m_DataStart);
106 if ( ASDCP_SUCCESS(result) )
108 WavHeader.FillADesc(m_ADesc, PictureRate);
109 m_FrameBufferSize = ASDCP::PCM::CalcFrameBufferSize(m_ADesc);
110 m_DataLength = WavHeader.data_len;
111 m_ADesc.ContainerDuration = m_DataLength / m_FrameBufferSize;
112 m_ADesc.ChannelFormat = PCM::CF_NONE;
117 ASDCP::AIFF::SimpleAIFFHeader AIFFHeader;
118 m_FileReader.Seek(0);
120 result = AIFFHeader.ReadFromFile(m_FileReader, &m_DataStart);
122 if ( ASDCP_SUCCESS(result) )
124 AIFFHeader.FillADesc(m_ADesc, PictureRate);
125 m_FrameBufferSize = ASDCP::PCM::CalcFrameBufferSize(m_ADesc);
126 m_DataLength = AIFFHeader.data_len;
127 m_ADesc.ContainerDuration = m_DataLength / m_FrameBufferSize;
128 m_ADesc.ChannelFormat = PCM::CF_NONE;
133 SimpleRF64Header RF64Header;
134 m_FileReader.Seek(0);
135 result = RF64Header.ReadFromFile(m_FileReader, &m_DataStart);
137 if ( ASDCP_SUCCESS(result) )
139 RF64Header.FillADesc(m_ADesc, PictureRate);
140 m_FrameBufferSize = ASDCP::PCM::CalcFrameBufferSize(m_ADesc);
141 m_DataLength = RF64Header.data_len;
142 m_ADesc.ContainerDuration = m_DataLength / m_FrameBufferSize;
143 m_ADesc.ChannelFormat = PCM::CF_NONE;
155 ASDCP::PCM::WAVParser::h__WAVParser::ReadFrame(FrameBuffer& FB)
159 if ( m_EOF || m_ReadCount >= m_DataLength )
160 return RESULT_ENDOFFILE;
162 if ( FB.Capacity() < m_FrameBufferSize )
164 DefaultLogSink().Error("FrameBuf.Capacity: %u FrameLength: %u\n",
165 FB.Capacity(), m_FrameBufferSize);
166 return RESULT_SMALLBUF;
169 ui32_t read_count = 0;
170 Result_t result = m_FileReader.Read(FB.Data(), m_FrameBufferSize, &read_count);
172 if ( result == RESULT_ENDOFFILE )
176 if ( read_count > 0 )
180 if ( ASDCP_SUCCESS(result) )
182 m_ReadCount += read_count;
184 FB.FrameNumber(m_FramesRead++);
191 //------------------------------------------------------------------------------------------
193 ASDCP::PCM::WAVParser::WAVParser()
197 ASDCP::PCM::WAVParser::~WAVParser()
201 // Opens the stream for reading, parses enough data to provide a complete
202 // set of stream metadata for the MXFWriter below.
204 ASDCP::PCM::WAVParser::OpenRead(const std::string& filename, const Rational& PictureRate) const
206 const_cast<ASDCP::PCM::WAVParser*>(this)->m_Parser = new h__WAVParser;
208 Result_t result = m_Parser->OpenRead(filename, PictureRate);
210 if ( ASDCP_FAILURE(result) )
211 const_cast<ASDCP::PCM::WAVParser*>(this)->m_Parser.release();
216 // Rewinds the stream to the beginning.
218 ASDCP::PCM::WAVParser::Reset() const
220 if ( m_Parser.empty() )
227 // Places a frame of data in the frame buffer. Fails if the buffer is too small
228 // or the stream is empty.
230 ASDCP::PCM::WAVParser::ReadFrame(FrameBuffer& FB) const
232 if ( m_Parser.empty() )
235 return m_Parser->ReadFrame(FB);
239 ASDCP::PCM::WAVParser::FillAudioDescriptor(AudioDescriptor& ADesc) const
241 if ( m_Parser.empty() )
244 ADesc = m_Parser->m_ADesc;
250 // end PCM_Parser.cpp