annotate data/fileio/ResamplingWavFileReader.cpp @ 316:3a6725f285d6

* Make RemoteFile far more pervasive, and use it for local files as well
  so that we can handle both transparently.  Make it shallow copy with
  reference counting, so it can be used by value without having to worry
  about the cache file lifetime.  Use RemoteFile for MainWindow file-open
  functions, etc

/* -*- 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 2007 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 "ResamplingWavFileReader.h"

#include "WavFileReader.h"
#include "base/Profiler.h"

#include <QProgressDialog>
#include <QFileInfo>
#include <QApplication>

ResamplingWavFileReader::ResamplingWavFileReader(RemoteFile source,
						 ResampleMode resampleMode,
						 CacheMode mode,
						 size_t targetRate) :
    CodedAudioFileReader(mode, targetRate),
    m_source(source),
    m_path(source.getLocalFilename()),
    m_cancelled(false),
    m_processed(0),
    m_completion(0),
    m_original(0),
    m_progress(0),
    m_decodeThread(0)
{
    m_channelCount = 0;
    m_fileRate = 0;

    std::cerr << "ResamplingWavFileReader::ResamplingWavFileReader(\""
              << m_path.toStdString() << "\"): rate " << targetRate << std::endl;

    Profiler profiler("ResamplingWavFileReader::ResamplingWavFileReader", true);

    m_original = new WavFileReader(m_path);
    if (!m_original->isOK()) {
        m_error = m_original->getError();
        return;
    }

    m_channelCount = m_original->getChannelCount();
    m_fileRate = m_original->getSampleRate();

    initialiseDecodeCache();

    if (resampleMode == ResampleAtOnce) {

	m_progress = new QProgressDialog
	    (QObject::tr("Resampling %1...").arg(QFileInfo(m_path).fileName()),
	     QObject::tr("Stop"), 0, 100);
	m_progress->hide();

        size_t blockSize = 16384;
        size_t total = m_original->getFrameCount();

        SampleBlock block;

        for (size_t i = 0; i < total; i += blockSize) {

            size_t count = blockSize;
            if (i + count > total) count = total - i;

            m_original->getInterleavedFrames(i, count, block);
            addBlock(block);

            if (m_cancelled) break;
        }

        if (isDecodeCacheInitialised()) finishDecodeCache();

        delete m_original;
        m_original = 0;

        delete m_progress;
        m_progress = 0;

    } else {

        m_decodeThread = new DecodeThread(this);
        m_decodeThread->start();
    }
}

ResamplingWavFileReader::~ResamplingWavFileReader()
{
    if (m_decodeThread) {
        m_cancelled = true;
        m_decodeThread->wait();
        delete m_decodeThread;
    }
    
    delete m_original;
}

void
ResamplingWavFileReader::DecodeThread::run()
{
    if (m_reader->m_cacheMode == CacheInTemporaryFile) {
        m_reader->startSerialised("ResamplingWavFileReader::Decode");
    }

    size_t blockSize = 16384;
    size_t total = m_reader->m_original->getFrameCount();
    
    SampleBlock block;
    
    for (size_t i = 0; i < total; i += blockSize) {
        
        size_t count = blockSize;
        if (i + count > total) count = total - i;
        
        m_reader->m_original->getInterleavedFrames(i, count, block);
        m_reader->addBlock(block);

        if (m_reader->m_cancelled) break;
    }
    
    if (m_reader->isDecodeCacheInitialised()) m_reader->finishDecodeCache();
    m_reader->m_completion = 100;

    m_reader->endSerialised();

    delete m_reader->m_original;
    m_reader->m_original = 0;
} 

void
ResamplingWavFileReader::addBlock(const SampleBlock &frames)
{
    addSamplesToDecodeCache(frames);

    m_processed += frames.size();

    int progress = lrint((float(m_processed) * 100) /
                         float(m_original->getFrameCount()));

    if (progress > 99) progress = 99;
    m_completion = progress;
    
    if (m_progress) {
	if (progress > m_progress->value()) {
	    m_progress->setValue(progress);
	    m_progress->show();
	    m_progress->raise();
	    qApp->processEvents();
	    if (m_progress->wasCanceled()) {
		m_cancelled = true;
	    }
	}
    }
}

void
ResamplingWavFileReader::getSupportedExtensions(std::set<QString> &extensions)
{
    WavFileReader::getSupportedExtensions(extensions);
}

bool
ResamplingWavFileReader::supportsExtension(QString extension)
{
    return WavFileReader::supportsExtension(extension);
}

bool
ResamplingWavFileReader::supportsContentType(QString type)
{
    return WavFileReader::supportsContentType(type);
}

bool
ResamplingWavFileReader::supports(RemoteFile &source)
{
    return WavFileReader::supports(source);
}