Chris@148: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@148: 
Chris@148: /*
Chris@148:     Sonic Visualiser
Chris@148:     An audio file viewer and annotation editor.
Chris@148:     Centre for Digital Music, Queen Mary, University of London.
Chris@148:     This file copyright 2006 Chris Cannam.
Chris@148:     
Chris@148:     This program is free software; you can redistribute it and/or
Chris@148:     modify it under the terms of the GNU General Public License as
Chris@148:     published by the Free Software Foundation; either version 2 of the
Chris@148:     License, or (at your option) any later version.  See the file
Chris@148:     COPYING included with this distribution for more information.
Chris@148: */
Chris@148: 
Chris@148: #include "WavFileReader.h"
Chris@148: 
Chris@148: #include <iostream>
Chris@148: 
Chris@148: WavFileReader::WavFileReader(QString path) :
Chris@148:     m_file(0),
Chris@148:     m_path(path),
Chris@148:     m_buffer(0),
Chris@148:     m_bufsiz(0),
Chris@148:     m_lastStart(0),
Chris@148:     m_lastCount(0)
Chris@148: {
Chris@148:     m_frameCount = 0;
Chris@148:     m_channelCount = 0;
Chris@148:     m_sampleRate = 0;
Chris@148: 
Chris@148:     m_fileInfo.format = 0;
Chris@148:     m_fileInfo.frames = 0;
Chris@148:     m_file = sf_open(m_path.toLocal8Bit(), SFM_READ, &m_fileInfo);
Chris@148: 
Chris@148:     if (!m_file || m_fileInfo.frames <= 0 || m_fileInfo.channels <= 0) {
Chris@148: 	std::cerr << "WavFileReader::initialize: Failed to open file ("
Chris@148: 		  << sf_strerror(m_file) << ")" << std::endl;
Chris@148: 
Chris@148: 	if (m_file) {
Chris@148: 	    m_error = QString("Couldn't load audio file '%1':\n%2")
Chris@148: 		.arg(m_path).arg(sf_strerror(m_file));
Chris@148: 	} else {
Chris@148: 	    m_error = QString("Failed to open audio file '%1'")
Chris@148: 		.arg(m_path);
Chris@148: 	}
Chris@148: 	return;
Chris@148:     }
Chris@148: 
Chris@148:     m_frameCount = m_fileInfo.frames;
Chris@148:     m_channelCount = m_fileInfo.channels;
Chris@148:     m_sampleRate = m_fileInfo.samplerate;
Chris@148: }
Chris@148: 
Chris@148: WavFileReader::~WavFileReader()
Chris@148: {
Chris@148:     if (m_file) sf_close(m_file);
Chris@148: }
Chris@148: 
Chris@148: void
Chris@148: WavFileReader::getInterleavedFrames(size_t start, size_t count,
Chris@148: 				    SampleBlock &results) const
Chris@148: {
Chris@148:     results.clear();
Chris@148:     if (!m_file || !m_channelCount) return;
Chris@148:     if (count == 0) return;
Chris@148: 
Chris@148:     if ((long)start >= m_fileInfo.frames) {
Chris@148: 	return;
Chris@148:     }
Chris@148: 
Chris@148:     if (long(start + count) > m_fileInfo.frames) {
Chris@148: 	count = m_fileInfo.frames - start;
Chris@148:     }
Chris@148: 
Chris@148:     sf_count_t readCount = 0;
Chris@148: 
Chris@148:     m_mutex.lock();
Chris@148: 
Chris@148:     if (start != m_lastStart || count != m_lastCount) {
Chris@148: 
Chris@148: 	if (sf_seek(m_file, start, SEEK_SET) < 0) {
Chris@148: 	    m_mutex.unlock();
Chris@148: 	    return;
Chris@148: 	}
Chris@148: 	
Chris@148: 	if (count * m_fileInfo.channels > m_bufsiz) {
Chris@148: //	    std::cerr << "WavFileReader: Reallocating buffer for " << count
Chris@148: //		      << " frames, " << m_fileInfo.channels << " channels: "
Chris@148: //		      << m_bufsiz << " floats" << std::endl;
Chris@148: 	    m_bufsiz = count * m_fileInfo.channels;
Chris@148: 	    delete[] m_buffer;
Chris@148: 	    m_buffer = new float[m_bufsiz];
Chris@148: 	}
Chris@148: 	
Chris@148: 	if ((readCount = sf_readf_float(m_file, m_buffer, count)) < 0) {
Chris@148: 	    m_mutex.unlock();
Chris@148: 	    return;
Chris@148: 	}
Chris@148: 
Chris@148: 	m_lastStart = start;
Chris@148: 	m_lastCount = readCount;
Chris@148:     }
Chris@148: 
Chris@148:     for (size_t i = 0; i < count * m_fileInfo.channels; ++i) {
Chris@148: 	results.push_back(m_buffer[i]);
Chris@148:     }
Chris@148: 
Chris@148:     m_mutex.unlock();
Chris@148:     return;
Chris@148: }
Chris@148: