view data/fileio/WavFileReader.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 "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);
}

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()));
}