view data/fileio/CodedAudioFileReader.cpp @ 263:71dfc6ab3b54

* Threaded mp3/ogg file reading. Not activated yet, as it doesn't work in context (SV needs to know the duration of its main model at the outset)
author Chris Cannam
date Thu, 24 May 2007 16:20:22 +0000
parents 900ac6667eab
children e08f486e8d8c
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/* -*- 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.
    
    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 "CodedAudioFileReader.h"

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

#include <iostream>
#include <QDir>
#include <QMutexLocker>

CodedAudioFileReader::CodedAudioFileReader(CacheMode cacheMode) :
    m_cacheMode(cacheMode),
    m_initialised(false),
    m_cacheFileWritePtr(0),
    m_cacheFileReader(0),
    m_cacheWriteBuffer(0),
    m_cacheWriteBufferIndex(0),
    m_cacheWriteBufferSize(16384)
{
}

CodedAudioFileReader::~CodedAudioFileReader()
{
    QMutexLocker locker(&m_cacheMutex);

    if (m_cacheFileWritePtr) sf_close(m_cacheFileWritePtr);
    if (m_cacheFileReader) delete m_cacheFileReader;
    if (m_cacheWriteBuffer) delete[] m_cacheWriteBuffer;

    if (m_cacheFileName != "") {
        if (!QFile(m_cacheFileName).remove()) {
            std::cerr << "WARNING: CodedAudioFileReader::~CodedAudioFileReader: Failed to delete cache file \"" << m_cacheFileName.toStdString() << "\"" << std::endl;
        }
    }
}

void
CodedAudioFileReader::initialiseDecodeCache()
{
    QMutexLocker locker(&m_cacheMutex);

    if (m_cacheMode == CacheInTemporaryFile) {

        m_cacheWriteBuffer = new float[m_cacheWriteBufferSize * m_channelCount];
        m_cacheWriteBufferIndex = 0;

        try {
            QDir dir(TempDirectory::getInstance()->getPath());
            m_cacheFileName = dir.filePath(QString("decoded_%1.wav")
                                           .arg((intptr_t)this));

            SF_INFO fileInfo;
            fileInfo.samplerate = m_sampleRate;
            fileInfo.channels = m_channelCount;
            fileInfo.format = SF_FORMAT_WAV | SF_FORMAT_FLOAT;
    
            m_cacheFileWritePtr = sf_open(m_cacheFileName.toLocal8Bit(),
                                          SFM_WRITE, &fileInfo);

            if (!m_cacheFileWritePtr) {
                std::cerr << "CodedAudioFileReader::initialiseDecodeCache: failed to open cache file \"" << m_cacheFileName.toStdString() << "\" (" << m_channelCount << " channels, sample rate " << m_sampleRate << " for writing, falling back to in-memory cache" << std::endl;
                m_cacheMode = CacheInMemory;
            }
        } catch (DirectoryCreationFailed f) {
            std::cerr << "CodedAudioFileReader::initialiseDecodeCache: failed to create temporary directory! Falling back to in-memory cache" << std::endl;
            m_cacheMode = CacheInMemory;
        }
    }

    if (m_cacheMode == CacheInMemory) {
        m_data.clear();
    }

    m_initialised = true;
}

void
CodedAudioFileReader::addSampleToDecodeCache(float sample)
{
    QMutexLocker locker(&m_cacheMutex);

    if (!m_initialised) return;

    switch (m_cacheMode) {

    case CacheInTemporaryFile:

        m_cacheWriteBuffer[m_cacheWriteBufferIndex++] = sample;

        if (m_cacheWriteBufferIndex ==
            m_cacheWriteBufferSize * m_channelCount) {

            //!!! check for return value! out of disk space, etc!
            sf_writef_float(m_cacheFileWritePtr,
                            m_cacheWriteBuffer,
                            m_cacheWriteBufferSize);

            m_cacheWriteBufferIndex = 0;
        }
        break;

    case CacheInMemory:
        m_data.push_back(sample);
        break;
    }
}

void
CodedAudioFileReader::finishDecodeCache()
{
    QMutexLocker locker(&m_cacheMutex);

    Profiler profiler("CodedAudioFileReader::finishDecodeCache", true);

    if (!m_initialised) {
        std::cerr << "WARNING: CodedAudioFileReader::finishDecodeCache: Cache was never initialised!" << std::endl;
        return;
    }

    switch (m_cacheMode) {

    case CacheInTemporaryFile:

        if (m_cacheWriteBufferIndex > 0) {
            //!!! check for return value! out of disk space, etc!
            sf_writef_float(m_cacheFileWritePtr,
                            m_cacheWriteBuffer,
                            m_cacheWriteBufferIndex / m_channelCount);
        }

        if (m_cacheWriteBuffer) {
            delete[] m_cacheWriteBuffer;
            m_cacheWriteBuffer = 0;
        }

        m_cacheWriteBufferIndex = 0;

        sf_close(m_cacheFileWritePtr);
        m_cacheFileWritePtr = 0;

        m_cacheFileReader = new WavFileReader(m_cacheFileName);

        if (!m_cacheFileReader->isOK()) {
            std::cerr << "ERROR: CodedAudioFileReader::finishDecodeCache: Failed to construct WAV file reader for temporary file: " << m_cacheFileReader->getError().toStdString() << std::endl;
            delete m_cacheFileReader;
            m_cacheFileReader = 0;
        }
        break;

    case CacheInMemory:
        // nothing to do 
        break;
    }
}

void
CodedAudioFileReader::getInterleavedFrames(size_t start, size_t count,
                                           SampleBlock &frames) const
{
    //!!! we want to ensure this doesn't require a lock -- at the
    // moment it does need one, but it doesn't have one...

    if (!m_initialised) return;

    switch (m_cacheMode) {

    case CacheInTemporaryFile:
        if (m_cacheFileReader) {
            m_cacheFileReader->getInterleavedFrames(start, count, frames);
        }
        break;

    case CacheInMemory:
    {
        frames.clear();
        if (!isOK()) return;
        if (count == 0) return;

        // slownessabounds

        for (size_t i = start; i < start + count; ++i) {
            for (size_t ch = 0; ch < m_channelCount; ++ch) {
                size_t index = i * m_channelCount + ch;
                if (index >= m_data.size()) return;
                frames.push_back(m_data[index]);
            }
        }
    }
    }
}