view data/fileio/WavFileWriter.cpp @ 537:3cc4b7cd2aa5

* Merge from one-fftdataserver-per-fftmodel branch.  This bit of
reworking (which is not described very accurately by the title of
the branch) turns the MatrixFile object into something that either
reads or writes, but not both, and separates the FFT file cache
reader and writer implementations separately.  This allows the
FFT data server to have a single thread owning writers and one reader
per "customer" thread, and for all locking to be vastly simplified
and concentrated in the data server alone (because none of the
classes it makes use of is used in more than one thread at a time).
The result is faster and more trustworthy code.

/* -*- 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;
}