view data/fileio/ResamplingWavFileReader.cpp @ 631:3a5ee4b6c9ad

* Complete the overhaul of CSV file import; now you can pick the purpose for
  each column in the file, and SV should do the rest.  The most significant
  practical improvement here is that we can now handle files in which time
  and duration do not necessarily appear in known columns.

/* -*- 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 "base/ProgressReporter.h"

#include <QFileInfo>

ResamplingWavFileReader::ResamplingWavFileReader(FileSource source,
						 ResampleMode resampleMode,
						 CacheMode mode,
						 size_t targetRate,
                                                 ProgressReporter *reporter) :
    CodedAudioFileReader(mode, targetRate),
    m_source(source),
    m_path(source.getLocalFilename()),
    m_cancelled(false),
    m_processed(0),
    m_completion(0),
    m_original(0),
    m_reporter(reporter),
    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) {

        if (m_reporter) {
            connect(m_reporter, SIGNAL(cancelled()), this, SLOT(cancelled()));
            m_reporter->setMessage
                (tr("Resampling %1...").arg(QFileInfo(m_path).fileName()));
        }

        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();
        endSerialised();

        if (m_reporter) m_reporter->setProgress(100);

        delete m_original;
        m_original = 0;

    } else {

        if (m_reporter) m_reporter->setProgress(100);

        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::cancelled()
{
    m_cancelled = true;
}

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();

    float ratio = float(m_sampleRate) / float(m_fileRate);

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

    if (progress > 99) progress = 99;
    m_completion = progress;
    
    if (m_reporter) {
        m_reporter->setProgress(progress);
    }
}

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(FileSource &source)
{
    return WavFileReader::supports(source);
}