view data/model/WaveFileModel.cpp @ 292:8c5762634f42

* avoid crash if m_reader is null

/* -*- 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 "WaveFileModel.h"

#include "fileio/AudioFileReader.h"
#include "fileio/AudioFileReaderFactory.h"

#include "system/System.h"

#include <QMessageBox>
#include <QFileInfo>

#include <iostream>
#include <unistd.h>
#include <math.h>
#include <sndfile.h>

#include <cassert>

//#define DEBUG_WAVE_FILE_MODEL 1

using std::cerr;
using std::endl;

PowerOfSqrtTwoZoomConstraint
WaveFileModel::m_zoomConstraint;

WaveFileModel::WaveFileModel(QString path) :
    m_path(path),
    m_myReader(true),
    m_fillThread(0),
    m_updateTimer(0),
    m_lastFillExtent(0),
    m_exiting(false)
{
    m_reader = AudioFileReaderFactory::createReader(path);
    if (m_reader) setObjectName(m_reader->getTitle());
    if (objectName() == "") setObjectName(QFileInfo(path).fileName());
    if (isOK()) fillCache();
}

WaveFileModel::WaveFileModel(QString path, QString originalLocation) :
    m_path(originalLocation),
    m_myReader(true),
    m_fillThread(0),
    m_updateTimer(0),
    m_lastFillExtent(0),
    m_exiting(false)
{
    m_reader = AudioFileReaderFactory::createReader(path);
    if (m_reader) setObjectName(m_reader->getTitle());
    if (objectName() == "") setObjectName(QFileInfo(originalLocation).fileName());
    if (isOK()) fillCache();
}

WaveFileModel::WaveFileModel(QString path, AudioFileReader *reader) :
    m_path(path),
    m_myReader(false),
    m_fillThread(0),
    m_updateTimer(0),
    m_lastFillExtent(0),
    m_exiting(false)
{
    m_reader = reader;
    if (m_reader) setObjectName(m_reader->getTitle());
    if (objectName() == "") setObjectName(QFileInfo(path).fileName());
    fillCache();
}

WaveFileModel::~WaveFileModel()
{
    m_exiting = true;
    if (m_fillThread) m_fillThread->wait();
    if (m_myReader) delete m_reader;
    m_reader = 0;
}

bool
WaveFileModel::isOK() const
{
    return m_reader && m_reader->isOK();
}

bool
WaveFileModel::isReady(int *completion) const
{
    bool ready = (isOK() && (m_fillThread == 0));
    double c = double(m_lastFillExtent) / double(getEndFrame() - getStartFrame());
    static int prevCompletion = 0;
    if (completion) {
        *completion = int(c * 100.0 + 0.01);
        if (m_reader) {
            int decodeCompletion = m_reader->getDecodeCompletion();
            if (decodeCompletion < 90) *completion = decodeCompletion;
            else *completion = std::min(*completion, decodeCompletion);
        }
        if (*completion != 0 &&
            *completion != 100 &&
            prevCompletion != 0 &&
            prevCompletion > *completion) {
            // just to avoid completion going backwards
            *completion = prevCompletion;
        }
        prevCompletion = *completion;
    }
#ifdef DEBUG_WAVE_FILE_MODEL
    std::cerr << "WaveFileModel::isReady(): ready = " << ready << ", completion = " << (completion ? *completion : -1) << std::endl;
#endif
    return ready;
}

Model *
WaveFileModel::clone() const
{
    WaveFileModel *model = new WaveFileModel(m_path);
    return model;
}

size_t
WaveFileModel::getFrameCount() const
{
    if (!m_reader) return 0;
    return m_reader->getFrameCount();
}

size_t
WaveFileModel::getChannelCount() const
{
    if (!m_reader) return 0;
    return m_reader->getChannelCount();
}

size_t
WaveFileModel::getSampleRate() const 
{
    if (!m_reader) return 0;
    return m_reader->getSampleRate();
}

size_t
WaveFileModel::getValues(int channel, size_t start, size_t end,
			 float *buffer) const
{
    // Always read these directly from the file. 
    // This is used for e.g. audio playback.
    // Could be much more efficient (although compiler optimisation will help)

    if (end < start) {
	std::cerr << "ERROR: WaveFileModel::getValues[float]: end < start ("
		  << end << " < " << start << ")" << std::endl;
	assert(end >= start);
    }

    if (!m_reader || !m_reader->isOK()) return 0;

#ifdef DEBUG_WAVE_FILE_MODEL
//    std::cerr << "WaveFileModel::getValues(" << channel << ", "
//              << start << ", " << end << "): calling reader" << std::endl;
#endif

    SampleBlock frames;
    m_reader->getInterleavedFrames(start, end - start, frames);

    size_t i = 0;

    int ch0 = channel, ch1 = channel, channels = getChannelCount();
    if (channel == -1) {
	ch0 = 0;
	ch1 = channels - 1;
    }
    
    while (i < end - start) {

	buffer[i] = 0.0;

	for (int ch = ch0; ch <= ch1; ++ch) {

	    size_t index = i * channels + ch;
	    if (index >= frames.size()) break;
            
	    float sample = frames[index];
	    buffer[i] += sample;
	}

	++i;
    }

    return i;
}

size_t
WaveFileModel::getValues(int channel, size_t start, size_t end,
			 double *buffer) const
{
    if (end < start) {
	std::cerr << "ERROR: WaveFileModel::getValues[double]: end < start ("
		  << end << " < " << start << ")" << std::endl;
	assert(end >= start);
    }

    if (!m_reader || !m_reader->isOK()) return 0;

    SampleBlock frames;
    m_reader->getInterleavedFrames(start, end - start, frames);

    size_t i = 0;

    int ch0 = channel, ch1 = channel, channels = getChannelCount();
    if (channel == -1) {
	ch0 = 0;
	ch1 = channels - 1;
    }

    while (i < end - start) {

	buffer[i] = 0.0;

	for (int ch = ch0; ch <= ch1; ++ch) {

	    size_t index = i * channels + ch;
	    if (index >= frames.size()) break;
            
	    float sample = frames[index];
	    buffer[i] += sample;
	}

	++i;
    }

    return i;
}

void
WaveFileModel::getRanges(size_t channel, size_t start, size_t end,
                         RangeBlock &ranges, size_t &blockSize) const
{
    ranges.clear();
    if (!isOK()) return;

    if (end <= start) {
	std::cerr << "WARNING: Internal error: end <= start in WaveFileModel::getRanges (end = " << end << ", start = " << start << ", blocksize = " << blockSize << ")" << std::endl;
	return;
    }

    int cacheType = 0;
    int power = m_zoomConstraint.getMinCachePower();
    blockSize = m_zoomConstraint.getNearestBlockSize
        (blockSize, cacheType, power, ZoomConstraint::RoundUp);

    size_t channels = getChannelCount();

    if (cacheType != 0 && cacheType != 1) {

	// We need to read directly from the file.  We haven't got
	// this cached.  Hope the requested area is small.  This is
	// not optimal -- we'll end up reading the same frames twice
	// for stereo files, in two separate calls to this method.
	// We could fairly trivially handle this for most cases that
	// matter by putting a single cache in getInterleavedFrames
	// for short queries.

	SampleBlock frames;
	m_reader->getInterleavedFrames(start, end - start, frames);
	float max = 0.0, min = 0.0, total = 0.0;
	size_t i = 0, count = 0;

	while (i < end - start) {

	    size_t index = i * channels + channel;
	    if (index >= frames.size()) break;
            
	    float sample = frames[index];
            if (sample > max || count == 0) max = sample;
	    if (sample < min || count == 0) min = sample;
            total += fabsf(sample);
	    
	    ++i;
            ++count;
            
            if (count == blockSize) {
                ranges.push_back(Range(min, max, total / count));
                min = max = total = 0.0f;
                count = 0;
	    }
	}

	if (count > 0) {
            ranges.push_back(Range(min, max, total / count));
	}

	return;

    } else {

	QMutexLocker locker(&m_mutex);
    
	const RangeBlock &cache = m_cache[cacheType];

	size_t cacheBlock, div;
        
	if (cacheType == 0) {
	    cacheBlock = (1 << m_zoomConstraint.getMinCachePower());
            div = (1 << power) / cacheBlock;
	} else {
	    cacheBlock = ((unsigned int)((1 << m_zoomConstraint.getMinCachePower()) * sqrt(2) + 0.01));
            div = ((unsigned int)((1 << power) * sqrt(2) + 0.01)) / cacheBlock;
	}

	size_t startIndex = start / cacheBlock;
	size_t endIndex = end / cacheBlock;

	float max = 0.0, min = 0.0, total = 0.0;
	size_t i = 0, count = 0;

#ifdef DEBUG_WAVE_FILE_MODEL
	cerr << "blockSize is " << blockSize << ", cacheBlock " << cacheBlock << ", start " << start << ", end " << end << " (frame count " << getFrameCount() << "), power is " << power << ", div is " << div << ", startIndex " << startIndex << ", endIndex " << endIndex << endl;
#endif

	for (i = 0; i < endIndex - startIndex; ) {
        
	    size_t index = (i + startIndex) * channels + channel;
	    if (index >= cache.size()) break;
            
            const Range &range = cache[index];
            if (range.max > max || count == 0) max = range.max;
            if (range.min < min || count == 0) min = range.min;
            total += range.absmean;
            
	    ++i;
            ++count;
            
	    if (count == div) {
		ranges.push_back(Range(min, max, total / count));
                min = max = total = 0.0f;
                count = 0;
	    }
	}
		
	if (count > 0) {
            ranges.push_back(Range(min, max, total / count));
	}
    }

#ifdef DEBUG_WAVE_FILE_MODEL
    cerr << "returning " << ranges.size() << " ranges" << endl;
#endif
    return;
}

WaveFileModel::Range
WaveFileModel::getRange(size_t channel, size_t start, size_t end) const
{
    Range range;
    if (!isOK()) return range;

    if (end <= start) {
	std::cerr << "WARNING: Internal error: end <= start in WaveFileModel::getRange (end = " << end << ", start = " << start << ")" << std::endl;
	return range;
    }

    size_t blockSize;
    for (blockSize = 1; blockSize <= end - start; blockSize *= 2);
    blockSize /= 2;

    bool first = false;

    size_t blockStart = (start / blockSize) * blockSize;
    size_t blockEnd = (end / blockSize) * blockSize;

    if (blockStart < start) blockStart += blockSize;
        
    if (blockEnd > blockStart) {
        RangeBlock ranges;
        getRanges(channel, blockStart, blockEnd, ranges, blockSize);
        for (size_t i = 0; i < ranges.size(); ++i) {
            if (first || ranges[i].min < range.min) range.min = ranges[i].min;
            if (first || ranges[i].max > range.max) range.max = ranges[i].max;
            if (first || ranges[i].absmean < range.absmean) range.absmean = ranges[i].absmean;
            first = false;
        }
    }

    if (blockStart > start) {
        Range startRange = getRange(channel, start, blockStart);
        range.min = std::min(range.min, startRange.min);
        range.max = std::max(range.max, startRange.max);
        range.absmean = std::min(range.absmean, startRange.absmean);
    }

    if (blockEnd < end) {
        Range endRange = getRange(channel, blockEnd, end);
        range.min = std::min(range.min, endRange.min);
        range.max = std::max(range.max, endRange.max);
        range.absmean = std::min(range.absmean, endRange.absmean);
    }

    return range;
}

void
WaveFileModel::fillCache()
{
    m_mutex.lock();

    m_updateTimer = new QTimer(this);
    connect(m_updateTimer, SIGNAL(timeout()), this, SLOT(fillTimerTimedOut()));
    m_updateTimer->start(100);

    m_fillThread = new RangeCacheFillThread(*this);
    connect(m_fillThread, SIGNAL(finished()), this, SLOT(cacheFilled()));

    m_mutex.unlock();
    m_fillThread->start();

#ifdef DEBUG_WAVE_FILE_MODEL
    std::cerr << "WaveFileModel::fillCache: started fill thread" << std::endl;
#endif
}   

void
WaveFileModel::fillTimerTimedOut()
{
    if (m_fillThread) {
	size_t fillExtent = m_fillThread->getFillExtent();
#ifdef DEBUG_WAVE_FILE_MODEL
        cerr << "WaveFileModel::fillTimerTimedOut: extent = " << fillExtent << endl;
#endif
	if (fillExtent > m_lastFillExtent) {
	    emit modelChanged(m_lastFillExtent, fillExtent);
	    m_lastFillExtent = fillExtent;
	}
    } else {
#ifdef DEBUG_WAVE_FILE_MODEL
        cerr << "WaveFileModel::fillTimerTimedOut: no thread" << std::endl;
#endif
	emit modelChanged();
    }
}

void
WaveFileModel::cacheFilled()
{
    m_mutex.lock();
    delete m_fillThread;
    m_fillThread = 0;
    delete m_updateTimer;
    m_updateTimer = 0;
    m_mutex.unlock();
    if (getEndFrame() > m_lastFillExtent) {
        emit modelChanged(m_lastFillExtent, getEndFrame());
    }
    emit modelChanged();
#ifdef DEBUG_WAVE_FILE_MODEL
    cerr << "WaveFileModel::cacheFilled" << endl;
#endif
}

void
WaveFileModel::RangeCacheFillThread::run()
{
    size_t cacheBlockSize[2];
    cacheBlockSize[0] = (1 << m_model.m_zoomConstraint.getMinCachePower());
    cacheBlockSize[1] = ((unsigned int)((1 << m_model.m_zoomConstraint.getMinCachePower()) *
                                        sqrt(2) + 0.01));
    
    size_t frame = 0;
    size_t readBlockSize = 16384;
    SampleBlock block;

    if (!m_model.isOK()) return;
    
    size_t channels = m_model.getChannelCount();
    bool updating = m_model.m_reader->isUpdating();

    if (updating) {
        while (channels == 0 && !m_model.m_exiting) {
//            std::cerr << "WaveFileModel::fill: Waiting for channels..." << std::endl;
            sleep(1);
            channels = m_model.getChannelCount();
        }
    }

    Range *range = new Range[2 * channels];
    size_t count[2];
    count[0] = count[1] = 0;

    bool first = true;

    while (first || updating) {

        updating = m_model.m_reader->isUpdating();
        m_frameCount = m_model.getFrameCount();

//        std::cerr << "WaveFileModel::fill: frame = " << frame << ", count = " << m_frameCount << std::endl;

        while (frame < m_frameCount) {

//            std::cerr << "WaveFileModel::fill inner loop: frame = " << frame << ", count = " << m_frameCount << ", blocksize " << readBlockSize << std::endl;

            if (updating && (frame + readBlockSize > m_frameCount)) break;

            m_model.m_reader->getInterleavedFrames(frame, readBlockSize, block);

//            std::cerr << "block is " << block.size() << std::endl;

            for (size_t i = 0; i < readBlockSize; ++i) {
		
                if (channels * i + channels > block.size()) break;

                for (size_t ch = 0; ch < size_t(channels); ++ch) {

                    size_t index = channels * i + ch;
                    float sample = block[index];
                    
                    for (size_t ct = 0; ct < 2; ++ct) { // cache type
                        
                        size_t rangeIndex = ch * 2 + ct;
                        
                        if (sample > range[rangeIndex].max || count[ct] == 0) {
                            range[rangeIndex].max = sample;
                        }
                        if (sample < range[rangeIndex].min || count[ct] == 0) {
                            range[rangeIndex].min = sample;
                        }
                        range[rangeIndex].absmean += fabsf(sample);
                    }
                }
                
                QMutexLocker locker(&m_model.m_mutex);

                for (size_t ct = 0; ct < 2; ++ct) {

                    if (++count[ct] == cacheBlockSize[ct]) {

                        for (size_t ch = 0; ch < size_t(channels); ++ch) {
                            size_t rangeIndex = ch * 2 + ct;
                            range[rangeIndex].absmean /= count[ct];
                            m_model.m_cache[ct].push_back(range[rangeIndex]);
                            range[rangeIndex] = Range();
                        }

                        count[ct] = 0;
                    }
                }
                
                ++frame;
            }
            
            if (m_model.m_exiting) break;
            
            m_fillExtent = frame;
        }

//        std::cerr << "WaveFileModel: inner loop ended" << std::endl;

        first = false;
        if (m_model.m_exiting) break;
        if (updating) {
//            std::cerr << "sleeping..." << std::endl;
            sleep(1);
        }
    }

    if (!m_model.m_exiting) {

        QMutexLocker locker(&m_model.m_mutex);

        for (size_t ct = 0; ct < 2; ++ct) {

            if (count[ct] > 0) {

                for (size_t ch = 0; ch < size_t(channels); ++ch) {
                    size_t rangeIndex = ch * 2 + ct;
                    range[rangeIndex].absmean /= count[ct];
                    m_model.m_cache[ct].push_back(range[rangeIndex]);
                    range[rangeIndex] = Range();
                }

                count[ct] = 0;
            }
            
            const Range &rr = *m_model.m_cache[ct].begin();
            MUNLOCK(&rr, m_model.m_cache[ct].capacity() * sizeof(Range));
        }
    }
    
    delete[] range;

    m_fillExtent = m_frameCount;

#ifdef DEBUG_WAVE_FILE_MODEL        
    for (size_t ct = 0; ct < 2; ++ct) {
        cerr << "Cache type " << ct << " now contains " << m_model.m_cache[ct].size() << " ranges" << endl;
    }
#endif
}

void
WaveFileModel::toXml(QTextStream &out,
                     QString indent,
                     QString extraAttributes) const
{
    Model::toXml(out, indent,
                 QString("type=\"wavefile\" file=\"%1\" %2")
                 .arg(encodeEntities(m_path)).arg(extraAttributes));
}