view data/fileio/WavFileWriter.cpp @ 489:82ab61fa9223

* Reorganise our sparql queries on the basis that Redland must be
  available, not only optional.  So for anything querying the pool
  of data about plugins, we use a single datastore and model which
  is initialised at the outset by PluginRDFIndexer and then queried
  directly; for anything that "reads from a file" (e.g. loading
  annotations) we query directly using Rasqal, going to the
  datastore when we need additional plugin-related information.

  This may improve performance, but mostly it simplifies the code
  and fixes a serious issue with RDF import in the previous versions
  (namely that multiple sequential RDF imports would end up sharing
  the same RDF data pool!)

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    This file copyright 2006 Chris Cannam and QMUL.
    
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#include "WavFileWriter.h"

#include "model/DenseTimeValueModel.h"
#include "base/Selection.h"

#include <QFileInfo>

#include <iostream>

WavFileWriter::WavFileWriter(QString path,
			     size_t sampleRate,
                             size_t channels) :
    m_path(path),
    m_sampleRate(sampleRate),
    m_channels(channels),
    m_file(0)
{
    SF_INFO fileInfo;
    fileInfo.samplerate = m_sampleRate;
    fileInfo.channels = m_channels;
    fileInfo.format = SF_FORMAT_WAV | SF_FORMAT_FLOAT;
    
    m_file = sf_open(m_path.toLocal8Bit(), SFM_WRITE, &fileInfo);
    if (!m_file) {
	std::cerr << "WavFileWriter: Failed to open file ("
		  << sf_strerror(m_file) << ")" << std::endl;
	m_error = QString("Failed to open audio file '%1' for writing")
	    .arg(m_path);
    }
}

WavFileWriter::~WavFileWriter()
{
    if (m_file) close();
}

bool
WavFileWriter::isOK() const
{
    return (m_error.isEmpty());
}

QString
WavFileWriter::getError() const
{
    return m_error;
}

bool
WavFileWriter::writeModel(DenseTimeValueModel *source,
                          MultiSelection *selection)
{
    if (source->getChannelCount() != m_channels) {
        std::cerr << "WavFileWriter::writeModel: Wrong number of channels ("
                  << source->getChannelCount()  << " != " << m_channels << ")"
                  << std::endl;
        m_error = QString("Failed to write model to audio file '%1'")
            .arg(m_path);
        return false;
    }

    if (!m_file) {
        m_error = QString("Failed to write model to audio file '%1': File not open")
            .arg(m_path);
	return false;
    }

    bool ownSelection = false;
    if (!selection) {
	selection = new MultiSelection;
	selection->setSelection(Selection(source->getStartFrame(),
					  source->getEndFrame()));
        ownSelection = true;
    }

    size_t bs = 2048;
    float *ub = new float[bs]; // uninterleaved buffer (one channel)
    float *ib = new float[bs * m_channels]; // interleaved buffer

    for (MultiSelection::SelectionList::iterator i =
	     selection->getSelections().begin();
	 i != selection->getSelections().end(); ++i) {
	
	size_t f0(i->getStartFrame()), f1(i->getEndFrame());

	for (size_t f = f0; f < f1; f += bs) {
	    
	    size_t n = std::min(bs, f1 - f);

	    for (int c = 0; c < int(m_channels); ++c) {
		source->getData(c, f, n, ub);
		for (size_t i = 0; i < n; ++i) {
		    ib[i * m_channels + c] = ub[i];
		}
	    }	    

	    sf_count_t written = sf_writef_float(m_file, ib, n);

	    if (written < n) {
		m_error = QString("Only wrote %1 of %2 frames at file frame %3")
		    .arg(written).arg(n).arg(f);
		break;
	    }
	}
    }

    delete[] ub;
    delete[] ib;
    if (ownSelection) delete selection;

    return isOK();
}
	
bool
WavFileWriter::writeSamples(float **samples, size_t count)
{
    if (!m_file) {
        m_error = QString("Failed to write model to audio file '%1': File not open")
            .arg(m_path);
	return false;
    }

    float *b = new float[count * m_channels];
    for (size_t i = 0; i < count; ++i) {
        for (size_t c = 0; c < m_channels; ++c) {
            b[i * m_channels + c] = samples[c][i];
        }
    }

    sf_count_t written = sf_writef_float(m_file, b, count);

    delete[] b;

    if (written < count) {
        m_error = QString("Only wrote %1 of %2 frames")
            .arg(written).arg(count);
    }

    return isOK();
}
    
bool
WavFileWriter::close()
{
    if (m_file) {
        sf_close(m_file);
        m_file = 0;
    }
    return true;
}