diff data/fileio/CodedAudioFileReader.cpp @ 148:1a42221a1522

* Reorganising code base.  This revision will not compile.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/data/fileio/CodedAudioFileReader.cpp	Mon Jul 31 11:49:58 2006 +0000
@@ -0,0 +1,192 @@
+/* -*- 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 <iostream>
+#include <QDir>
+
+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()
+{
+    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()
+{
+    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)
+{
+    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()
+{
+    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
+{
+    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]);
+            }
+        }
+    }
+    }
+}
+