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
28 \version $Id: PCM_Parser.cpp,v 1.7 2011/05/13 01:50:19 jhurst Exp $
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;
42 //------------------------------------------------------------------------------------------
45 class ASDCP::PCM::WAVParser::h__WAVParser
47 Kumu::FileReader m_FileReader;
52 ui32_t m_FrameBufferSize;
54 Rational m_PictureRate;
56 ASDCP_NO_COPY_CONSTRUCT(h__WAVParser);
59 AudioDescriptor m_ADesc;
63 m_EOF(false), m_DataStart(0), m_DataLength(0), m_ReadCount(0),
64 m_FrameBufferSize(0), m_FramesRead(0) {}
71 Result_t OpenRead(const char* filename, const Rational& PictureRate);
74 Result_t ReadFrame(FrameBuffer&);
80 ASDCP::PCM::WAVParser::h__WAVParser::Close()
87 ASDCP::PCM::WAVParser::h__WAVParser::Reset()
89 m_FileReader.Seek(m_DataStart);
96 ASDCP::PCM::WAVParser::h__WAVParser::OpenRead(const char* filename, const Rational& PictureRate)
98 ASDCP_TEST_NULL_STR(filename);
100 Result_t result = m_FileReader.OpenRead(filename);
102 if ( ASDCP_SUCCESS(result) )
104 SimpleWaveHeader WavHeader;
105 result = WavHeader.ReadFromFile(m_FileReader, &m_DataStart);
107 if ( ASDCP_SUCCESS(result) )
109 WavHeader.FillADesc(m_ADesc, PictureRate);
110 m_FrameBufferSize = ASDCP::PCM::CalcFrameBufferSize(m_ADesc);
111 m_DataLength = WavHeader.data_len;
112 m_ADesc.ContainerDuration = m_DataLength / m_FrameBufferSize;
113 m_ADesc.ChannelFormat = PCM::CF_NONE;
118 ASDCP::AIFF::SimpleAIFFHeader AIFFHeader;
119 m_FileReader.Seek(0);
121 result = AIFFHeader.ReadFromFile(m_FileReader, &m_DataStart);
123 if ( ASDCP_SUCCESS(result) )
125 AIFFHeader.FillADesc(m_ADesc, PictureRate);
126 m_FrameBufferSize = ASDCP::PCM::CalcFrameBufferSize(m_ADesc);
127 m_DataLength = AIFFHeader.data_len;
128 m_ADesc.ContainerDuration = m_DataLength / m_FrameBufferSize;
129 m_ADesc.ChannelFormat = PCM::CF_NONE;
140 ASDCP::PCM::WAVParser::h__WAVParser::ReadFrame(FrameBuffer& FB)
144 if ( m_EOF || m_ReadCount >= m_DataLength )
145 return RESULT_ENDOFFILE;
147 if ( FB.Capacity() < m_FrameBufferSize )
149 DefaultLogSink().Error("FrameBuf.Capacity: %u FrameLength: %u\n",
150 FB.Capacity(), m_FrameBufferSize);
151 return RESULT_SMALLBUF;
154 ui32_t read_count = 0;
155 Result_t result = m_FileReader.Read(FB.Data(), m_FrameBufferSize, &read_count);
157 if ( result == RESULT_ENDOFFILE )
161 if ( read_count > 0 )
165 if ( ASDCP_SUCCESS(result) )
167 m_ReadCount += read_count;
169 FB.FrameNumber(m_FramesRead++);
176 //------------------------------------------------------------------------------------------
178 ASDCP::PCM::WAVParser::WAVParser()
182 ASDCP::PCM::WAVParser::~WAVParser()
186 // Opens the stream for reading, parses enough data to provide a complete
187 // set of stream metadata for the MXFWriter below.
189 ASDCP::PCM::WAVParser::OpenRead(const char* filename, const Rational& PictureRate) const
191 const_cast<ASDCP::PCM::WAVParser*>(this)->m_Parser = new h__WAVParser;
193 Result_t result = m_Parser->OpenRead(filename, PictureRate);
195 if ( ASDCP_FAILURE(result) )
196 const_cast<ASDCP::PCM::WAVParser*>(this)->m_Parser.release();
201 // Rewinds the stream to the beginning.
203 ASDCP::PCM::WAVParser::Reset() const
205 if ( m_Parser.empty() )
212 // Places a frame of data in the frame buffer. Fails if the buffer is too small
213 // or the stream is empty.
215 ASDCP::PCM::WAVParser::ReadFrame(FrameBuffer& FB) const
217 if ( m_Parser.empty() )
220 return m_Parser->ReadFrame(FB);
224 ASDCP::PCM::WAVParser::FillAudioDescriptor(AudioDescriptor& ADesc) const
226 if ( m_Parser.empty() )
229 ADesc = m_Parser->m_ADesc;
235 // end PCM_Parser.cpp