view data/fileio/WavFileReader.cpp @ 618:b1dc68507e46 sv-v1.7.1

* Layer data editor window: fix sorting for columns in region model,
  add Find feature
* RDF import: assign names to layers based on event types, if no suitable
  labels are found in the RDF
* Add label to status bar showing the last text that was passed in current
  layer (so e.g. counting 1, 2, 3, 4 if that's what beats are labelled)
* Better layout of text labels for region layers in segmentation mode when
  they are close together
* Give text layer the same method for finding "nearest point" as region and
  note layers, should improve its editability

/* -*- 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 "WavFileReader.h"

#include <iostream>

#include <QMutexLocker>
#include <QFileInfo>

WavFileReader::WavFileReader(FileSource source, bool fileUpdating) :
    m_file(0),
    m_source(source),
    m_path(source.getLocalFilename()),
    m_buffer(0),
    m_bufsiz(0),
    m_lastStart(0),
    m_lastCount(0),
    m_updating(fileUpdating)
{
    m_frameCount = 0;
    m_channelCount = 0;
    m_sampleRate = 0;

    m_fileInfo.format = 0;
    m_fileInfo.frames = 0;
    m_file = sf_open(m_path.toLocal8Bit(), SFM_READ, &m_fileInfo);

    if (!m_file || (!fileUpdating && m_fileInfo.channels <= 0)) {
	std::cerr << "WavFileReader::initialize: Failed to open file ("
		  << sf_strerror(m_file) << ")" << std::endl;

	if (m_file) {
	    m_error = QString("Couldn't load audio file '%1':\n%2")
		.arg(m_path).arg(sf_strerror(m_file));
	} else {
	    m_error = QString("Failed to open audio file '%1'")
		.arg(m_path);
	}
	return;
    }

    if (m_fileInfo.channels > 0) {
        m_frameCount = m_fileInfo.frames;
        m_channelCount = m_fileInfo.channels;
        m_sampleRate = m_fileInfo.samplerate;
    }

//    std::cerr << "WavFileReader: Frame count " << m_frameCount << ", channel count " << m_channelCount << ", sample rate " << m_sampleRate << std::endl;

}

WavFileReader::~WavFileReader()
{
    if (m_file) sf_close(m_file);
    delete[] m_buffer;
}

void
WavFileReader::updateFrameCount()
{
    QMutexLocker locker(&m_mutex);

    size_t prevCount = m_fileInfo.frames;

    if (m_file) {
        sf_close(m_file);
        m_file = sf_open(m_path.toLocal8Bit(), SFM_READ, &m_fileInfo);
        if (!m_file || m_fileInfo.channels <= 0) {
            std::cerr << "WavFileReader::updateFrameCount: Failed to open file ("
                      << sf_strerror(m_file) << ")" << std::endl;
        }
    }

//    std::cerr << "WavFileReader::updateFrameCount: now " << m_fileInfo.frames << std::endl;

    m_frameCount = m_fileInfo.frames;

    if (m_channelCount == 0) {
        m_channelCount = m_fileInfo.channels;
        m_sampleRate = m_fileInfo.samplerate;
    }

    if (m_frameCount != prevCount) {
//        std::cerr << "frameCountChanged" << std::endl;
        emit frameCountChanged();
    }
}

void
WavFileReader::updateDone()
{
    updateFrameCount();
    m_updating = false;
}

void
WavFileReader::getInterleavedFrames(size_t start, size_t count,
				    SampleBlock &results) const
{
    if (count == 0) return;
    results.clear();
    results.reserve(count * m_fileInfo.channels);

    QMutexLocker locker(&m_mutex);

    if (!m_file || !m_channelCount) {
        return;
    }

    if ((long)start >= m_fileInfo.frames) {
//        std::cerr << "WavFileReader::getInterleavedFrames: " << start
//                  << " > " << m_fileInfo.frames << std::endl;
	return;
    }

    if (long(start + count) > m_fileInfo.frames) {
	count = m_fileInfo.frames - start;
    }

    sf_count_t readCount = 0;

    if (start != m_lastStart || count != m_lastCount) {

	if (sf_seek(m_file, start, SEEK_SET) < 0) {
//            std::cerr << "sf_seek failed" << std::endl;
	    return;
	}
	
	if (count * m_fileInfo.channels > m_bufsiz) {
//	    std::cerr << "WavFileReader: Reallocating buffer for " << count
//		      << " frames, " << m_fileInfo.channels << " channels: "
//		      << m_bufsiz << " floats" << std::endl;
	    m_bufsiz = count * m_fileInfo.channels;
	    delete[] m_buffer;
	    m_buffer = new float[m_bufsiz];
	}
	
	if ((readCount = sf_readf_float(m_file, m_buffer, count)) < 0) {
//            std::cerr << "sf_readf_float failed" << std::endl;
	    return;
	}

	m_lastStart = start;
	m_lastCount = readCount;
    }

    for (size_t i = 0; i < count * m_fileInfo.channels; ++i) {
        if (i >= m_bufsiz) {
            std::cerr << "INTERNAL ERROR: WavFileReader::getInterleavedFrames: " << i << " >= " << m_bufsiz << std::endl;
        }
	results.push_back(m_buffer[i]);
    }

    return;
}

void
WavFileReader::getSupportedExtensions(std::set<QString> &extensions)
{
    int count;

    if (sf_command(0, SFC_GET_FORMAT_MAJOR_COUNT, &count, sizeof(count))) {
        extensions.insert("wav");
        extensions.insert("aiff");
        extensions.insert("aifc");
        extensions.insert("aif");
        return;
    }

    SF_FORMAT_INFO info;
    for (int i = 0; i < count; ++i) {
        info.format = i;
        if (!sf_command(0, SFC_GET_FORMAT_MAJOR, &info, sizeof(info))) {
            extensions.insert(QString(info.extension).toLower());
        }
    }
}

bool
WavFileReader::supportsExtension(QString extension)
{
    std::set<QString> extensions;
    getSupportedExtensions(extensions);
    return (extensions.find(extension.toLower()) != extensions.end());
}

bool
WavFileReader::supportsContentType(QString type)
{
    return (type == "audio/x-wav" ||
            type == "audio/x-aiff" ||
            type == "audio/basic");
}

bool
WavFileReader::supports(FileSource &source)
{
    return (supportsExtension(source.getExtension()) ||
            supportsContentType(source.getContentType()));
}