2 Copyright (c) 2004, John Hurst
5 Redistribution and use in source and binary forms, with or without
6 modification, are permitted provided that the following conditions
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9 notice, this list of conditions and the following disclaimer.
10 2. Redistributions in binary form must reproduce the above copyright
11 notice, this list of conditions and the following disclaimer in the
12 documentation and/or other materials provided with the distribution.
13 3. The name of the author may not be used to endorse or promote products
14 derived from this software without specific prior written permission.
16 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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21 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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25 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 /*! \file PCM_Parser.cpp
29 \brief AS-DCP library, PCM raw essence reader implementation
35 using namespace ASDCP;
36 using namespace ASDCP::PCM;
37 using namespace ASDCP::Wav;
40 //------------------------------------------------------------------------------------------
43 class ASDCP::PCM::WAVParser::h__WAVParser
45 FileReader m_FileReader;
50 ui32_t m_FrameBufferSize;
52 Rational m_PictureRate;
54 ASDCP_NO_COPY_CONSTRUCT(h__WAVParser);
57 AudioDescriptor m_ADesc;
61 m_EOF(false), m_DataStart(0), m_DataLength(0), m_ReadCount(0),
62 m_FrameBufferSize(0), m_FramesRead(0) {}
69 Result_t OpenRead(const char* filename, const Rational& PictureRate);
72 Result_t ReadFrame(FrameBuffer&);
78 ASDCP::PCM::WAVParser::h__WAVParser::Close()
85 ASDCP::PCM::WAVParser::h__WAVParser::Reset()
87 m_FileReader.Seek(m_DataStart);
94 ASDCP::PCM::WAVParser::h__WAVParser::OpenRead(const char* filename, const Rational& PictureRate)
96 ASDCP_TEST_NULL_STR(filename);
97 SimpleWaveHeader WavHeader;
99 Result_t result = m_FileReader.OpenRead(filename);
101 if ( ASDCP_SUCCESS(result) )
102 result = WavHeader.ReadFromFile(m_FileReader, &m_DataStart);
104 if ( ASDCP_SUCCESS(result) )
106 WavHeader.FillADesc(m_ADesc, PictureRate);
107 m_FrameBufferSize = ASDCP::PCM::CalcFrameBufferSize(m_ADesc);
108 m_DataLength = WavHeader.data_len;
109 m_ADesc.ContainerDuration = m_DataLength / m_FrameBufferSize;
118 ASDCP::PCM::WAVParser::h__WAVParser::ReadFrame(FrameBuffer& FB)
122 if ( m_EOF || m_ReadCount >= m_DataLength )
123 return RESULT_ENDOFFILE;
125 if ( FB.Capacity() < m_FrameBufferSize )
127 DefaultLogSink().Error("FrameBuf.Capacity: %lu FrameLength: %lu\n",
128 FB.Capacity(), m_FrameBufferSize);
129 return RESULT_SMALLBUF;
132 ui32_t read_count = 0;
133 Result_t result = m_FileReader.Read(FB.Data(), m_FrameBufferSize, &read_count);
135 if ( result == RESULT_ENDOFFILE )
139 if ( read_count > 0 )
143 if ( ASDCP_SUCCESS(result) )
145 m_ReadCount += read_count;
147 FB.FrameNumber(m_FramesRead++);
154 //------------------------------------------------------------------------------------------
156 ASDCP::PCM::WAVParser::WAVParser()
160 ASDCP::PCM::WAVParser::~WAVParser()
164 // Opens the stream for reading, parses enough data to provide a complete
165 // set of stream metadata for the MXFWriter below.
167 ASDCP::PCM::WAVParser::OpenRead(const char* filename, const Rational& PictureRate) const
169 const_cast<ASDCP::PCM::WAVParser*>(this)->m_Parser = new h__WAVParser;
171 Result_t result = m_Parser->OpenRead(filename, PictureRate);
173 if ( ASDCP_FAILURE(result) )
174 const_cast<ASDCP::PCM::WAVParser*>(this)->m_Parser.release();
179 // Rewinds the stream to the beginning.
181 ASDCP::PCM::WAVParser::Reset() const
183 if ( m_Parser.empty() )
190 // Places a frame of data in the frame buffer. Fails if the buffer is too small
191 // or the stream is empty.
193 ASDCP::PCM::WAVParser::ReadFrame(FrameBuffer& FB) const
195 if ( m_Parser.empty() )
198 return m_Parser->ReadFrame(FB);
202 ASDCP::PCM::WAVParser::FillAudioDescriptor(AudioDescriptor& ADesc) const
204 if ( m_Parser.empty() )
207 ADesc = m_Parser->m_ADesc;
213 // end PCM_Parser.cpp