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 char* 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 char* filename, const Rational& PictureRate)
99 ASDCP_TEST_NULL_STR(filename);
101 Result_t result = m_FileReader.OpenRead(filename);
103 if ( ASDCP_SUCCESS(result) )
105 SimpleWaveHeader WavHeader;
106 result = WavHeader.ReadFromFile(m_FileReader, &m_DataStart);
108 if ( ASDCP_SUCCESS(result) )
110 WavHeader.FillADesc(m_ADesc, PictureRate);
111 m_FrameBufferSize = ASDCP::PCM::CalcFrameBufferSize(m_ADesc);
112 m_DataLength = WavHeader.data_len;
113 m_ADesc.ContainerDuration = m_DataLength / m_FrameBufferSize;
114 m_ADesc.ChannelFormat = PCM::CF_NONE;
119 ASDCP::AIFF::SimpleAIFFHeader AIFFHeader;
120 m_FileReader.Seek(0);
122 result = AIFFHeader.ReadFromFile(m_FileReader, &m_DataStart);
124 if ( ASDCP_SUCCESS(result) )
126 AIFFHeader.FillADesc(m_ADesc, PictureRate);
127 m_FrameBufferSize = ASDCP::PCM::CalcFrameBufferSize(m_ADesc);
128 m_DataLength = AIFFHeader.data_len;
129 m_ADesc.ContainerDuration = m_DataLength / m_FrameBufferSize;
130 m_ADesc.ChannelFormat = PCM::CF_NONE;
135 SimpleRF64Header RF64Header;
136 m_FileReader.Seek(0);
137 result = RF64Header.ReadFromFile(m_FileReader, &m_DataStart);
139 if ( ASDCP_SUCCESS(result) )
141 RF64Header.FillADesc(m_ADesc, PictureRate);
142 m_FrameBufferSize = ASDCP::PCM::CalcFrameBufferSize(m_ADesc);
143 m_DataLength = RF64Header.data_len;
144 m_ADesc.ContainerDuration = m_DataLength / m_FrameBufferSize;
145 m_ADesc.ChannelFormat = PCM::CF_NONE;
157 ASDCP::PCM::WAVParser::h__WAVParser::ReadFrame(FrameBuffer& FB)
161 if ( m_EOF || m_ReadCount >= m_DataLength )
162 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 )
182 if ( ASDCP_SUCCESS(result) )
184 m_ReadCount += read_count;
186 FB.FrameNumber(m_FramesRead++);
193 //------------------------------------------------------------------------------------------
195 ASDCP::PCM::WAVParser::WAVParser()
199 ASDCP::PCM::WAVParser::~WAVParser()
203 // Opens the stream for reading, parses enough data to provide a complete
204 // set of stream metadata for the MXFWriter below.
206 ASDCP::PCM::WAVParser::OpenRead(const char* filename, const Rational& PictureRate) const
208 const_cast<ASDCP::PCM::WAVParser*>(this)->m_Parser = new h__WAVParser;
210 Result_t result = m_Parser->OpenRead(filename, PictureRate);
212 if ( ASDCP_FAILURE(result) )
213 const_cast<ASDCP::PCM::WAVParser*>(this)->m_Parser.release();
218 // Rewinds the stream to the beginning.
220 ASDCP::PCM::WAVParser::Reset() const
222 if ( m_Parser.empty() )
229 // Places a frame of data in the frame buffer. Fails if the buffer is too small
230 // or the stream is empty.
232 ASDCP::PCM::WAVParser::ReadFrame(FrameBuffer& FB) const
234 if ( m_Parser.empty() )
237 return m_Parser->ReadFrame(FB);
241 ASDCP::PCM::WAVParser::FillAudioDescriptor(AudioDescriptor& ADesc) const
243 if ( m_Parser.empty() )
246 ADesc = m_Parser->m_ADesc;
252 // end PCM_Parser.cpp