2 Copyright (c) 2004-2011, John Hurst
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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)
161 return RESULT_ENDOFFILE;
164 if ( FB.Capacity() < m_FrameBufferSize )
166 DefaultLogSink().Error("FrameBuf.Capacity: %u FrameLength: %u\n",
167 FB.Capacity(), m_FrameBufferSize);
168 return RESULT_SMALLBUF;
171 ui32_t read_count = 0;
172 Result_t result = m_FileReader.Read(FB.Data(), m_FrameBufferSize, &read_count);
174 if ( result == RESULT_ENDOFFILE )
178 if ( read_count > 0 )
184 if ( ASDCP_SUCCESS(result) )
186 m_ReadCount += read_count;
188 FB.FrameNumber(m_FramesRead++);
190 if ( read_count < FB.Capacity() )
192 memset(FB.Data() + FB.Size(), 0, FB.Capacity() - FB.Size());
200 //------------------------------------------------------------------------------------------
202 ASDCP::PCM::WAVParser::WAVParser()
206 ASDCP::PCM::WAVParser::~WAVParser()
210 // Opens the stream for reading, parses enough data to provide a complete
211 // set of stream metadata for the MXFWriter below.
213 ASDCP::PCM::WAVParser::OpenRead(const std::string& filename, const Rational& PictureRate) const
215 const_cast<ASDCP::PCM::WAVParser*>(this)->m_Parser = new h__WAVParser;
217 Result_t result = m_Parser->OpenRead(filename, PictureRate);
219 if ( ASDCP_FAILURE(result) )
220 const_cast<ASDCP::PCM::WAVParser*>(this)->m_Parser.release();
225 // Rewinds the stream to the beginning.
227 ASDCP::PCM::WAVParser::Reset() const
229 if ( m_Parser.empty() )
236 // Places a frame of data in the frame buffer. Fails if the buffer is too small
237 // or the stream is empty.
239 ASDCP::PCM::WAVParser::ReadFrame(FrameBuffer& FB) const
241 if ( m_Parser.empty() )
244 return m_Parser->ReadFrame(FB);
248 ASDCP::PCM::WAVParser::FillAudioDescriptor(AudioDescriptor& ADesc) const
250 if ( m_Parser.empty() )
253 ADesc = m_Parser->m_ADesc;
259 // end PCM_Parser.cpp