# HG changeset patch
# User Chris Cannam
# Date 1412185112 -3600
# Node ID de76b2df518f93323f20be8849b0c9ec4f067b97
# Parent  76d9d86ae6cd9aa76c9384cf6398e72229f17de7
Start on multiplex implementation

diff -r 76d9d86ae6cd -r de76b2df518f runner/FeatureExtractionManager.cpp
--- a/runner/FeatureExtractionManager.cpp	Wed Oct 01 17:50:58 2014 +0100
+++ b/runner/FeatureExtractionManager.cpp	Wed Oct 01 18:38:32 2014 +0100
@@ -14,6 +14,7 @@
 */
 
 #include "FeatureExtractionManager.h"
+#include "MultiplexedReader.h"
 
 #include <vamp-hostsdk/PluginChannelAdapter.h>
 #include <vamp-hostsdk/PluginBufferingAdapter.h>
@@ -428,7 +429,7 @@
     return addFeatureExtractor(transform, writers);
 }
 
-void FeatureExtractionManager::addSource(QString audioSource)
+void FeatureExtractionManager::addSource(QString audioSource, bool willMultiplex)
 {
     if (QFileInfo(audioSource).suffix().toLower() == "m3u") {
         ProgressPrinter retrievalProgress("Opening playlist file...");
@@ -443,7 +444,7 @@
         if (reader.isOK()) {
             vector<QString> files = reader.load();
             for (int i = 0; i < (int)files.size(); ++i) {
-                addSource(files[i]);
+                addSource(files[i], willMultiplex);
             }
             return;
         } else {
@@ -487,10 +488,14 @@
 
         cerr << "File or URL \"" << audioSource.toStdString() << "\" opened successfully" << endl;
 
-        if (m_channels == 0) {
-            m_channels = reader->getChannelCount();
-            cerr << "Taking default channel count of "
-                 << reader->getChannelCount() << " from file" << endl;
+        if (willMultiplex) {
+            ++m_channels; // channel count is simply number of sources
+        } else {
+            if (m_channels == 0) {
+                m_channels = reader->getChannelCount();
+                cerr << "Taking default channel count of "
+                     << reader->getChannelCount() << " from file" << endl;
+            }
         }
 
         if (m_defaultSampleRate == 0) {
@@ -509,6 +514,8 @@
     if (m_plugins.empty()) return;
 
     if (QFileInfo(audioSource).suffix().toLower() == "m3u") {
+        //!!! This shouldn't happen here, it should be done in
+        //!!! main.cpp when assembling the sources list
         FileSource source(audioSource);
         PlaylistFileReader reader(source);
         if (reader.isOK()) {
@@ -546,13 +553,44 @@
             (audioSource, "internal error: have sources and plugins, but no channel count");
     }
 
-    AudioFileReader *reader = 0;
+    AudioFileReader *reader = prepareReader(audioSource);
+    extractFeaturesFor(reader, audioSource); // Note this also deletes reader
+}
 
-    if (m_readyReaders.contains(audioSource)) {
-        reader = m_readyReaders[audioSource];
-        m_readyReaders.remove(audioSource);
-        if (reader->getChannelCount() != m_channels ||
-            reader->getSampleRate() != m_sampleRate) {
+void FeatureExtractionManager::extractFeaturesMultiplexed(QStringList sources)
+{
+    if (m_plugins.empty() || sources.empty()) return;
+
+    QString nominalSource = sources[0];
+
+    testOutputFiles(nominalSource);
+
+    if (m_sampleRate == 0) {
+        throw FileOperationFailed
+            (nominalSource, "internal error: have sources and plugins, but no sample rate");
+    }
+    if (m_channels == 0) {
+        throw FileOperationFailed
+            (nominalSource, "internal error: have sources and plugins, but no channel count");
+    }
+
+    QList<AudioFileReader *> readers;
+    foreach (QString source, sources) {
+        AudioFileReader *reader = prepareReader(source);
+        readers.push_back(reader);
+    }
+
+    AudioFileReader *reader = new MultiplexedReader(readers);
+    extractFeaturesFor(reader, nominalSource); // Note this also deletes reader
+}
+
+AudioFileReader *
+FeatureExtractionManager::prepareReader(QString source)
+{
+    if (m_readyReaders.contains(source)) {
+        reader = m_readyReaders[source];
+        m_readyReaders.remove(source);
+        if (reader->getSampleRate() != m_sampleRate) {
             // can't use this; open it again
             delete reader;
             reader = 0;
@@ -560,16 +598,23 @@
     }
     if (!reader) {
         ProgressPrinter retrievalProgress("Retrieving audio data...");
-        FileSource source(audioSource, &retrievalProgress);
-        source.waitForData();
+        FileSource fs(source, &retrievalProgress);
+        fs.waitForData();
         reader = AudioFileReaderFactory::createReader
-            (source, m_sampleRate, false, &retrievalProgress);
+            (fs, m_sampleRate, false, &retrievalProgress);
         retrievalProgress.done();
     }
-
     if (!reader) {
         throw FailedToOpenFile(audioSource);
     }
+    return reader;
+}
+
+void
+FeatureExtractionManager::extractFeaturesFor(AudioFileReader *reader,
+                                             QString audioSource)
+{
+    // Note: This also deletes reader
 
     cerr << "Audio file \"" << audioSource.toStdString() << "\": "
          << reader->getChannelCount() << "ch at " 
diff -r 76d9d86ae6cd -r de76b2df518f runner/FeatureExtractionManager.h
--- a/runner/FeatureExtractionManager.h	Wed Oct 01 17:50:58 2014 +0100
+++ b/runner/FeatureExtractionManager.h	Wed Oct 01 18:38:32 2014 +0100
@@ -61,13 +61,18 @@
     // Make a note of an audio or playlist file which will be passed
     // to extractFeatures later.  Amongst other things, this may
     // initialise the default sample rate and channel count
-    void addSource(QString audioSource);
+    void addSource(QString audioSource, bool willMultiplex);
 
     // Extract features from the given audio or playlist file.  If the
     // file is a playlist and force is true, continue extracting even
     // if a file in the playlist fails.
     void extractFeatures(QString audioSource, bool force);
 
+    // Extract features from the given audio files, multiplexing into
+    // a single "file" whose individual channels are mixdowns of the
+    // supplied sources.
+    void extractFeaturesMultiplexed(QStringList sources);
+
 private:
     // A plugin may have many outputs, so we can have more than one
     // transform requested for a single plugin.  The things we want to
@@ -102,6 +107,10 @@
     bool m_summariesOnly;
     Vamp::HostExt::PluginSummarisingAdapter::SegmentBoundaries m_boundaries;
 
+    AudioFileReader *prepareReader(QString audioSource);
+
+    void extractFeaturesFor(AudioFileReader *reader, QString audioSource);
+
     void writeSummaries(QString audioSource, Vamp::Plugin *);
 
     void writeFeatures(QString audioSource,
diff -r 76d9d86ae6cd -r de76b2df518f runner/MultiplexedReader.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/runner/MultiplexedReader.h	Wed Oct 01 18:38:32 2014 +0100
@@ -0,0 +1,93 @@
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Sonic Annotator
+    A utility for batch feature extraction from audio files.
+    Mark Levy, Chris Sutton and Chris Cannam, Queen Mary, University of London.
+    Copyright 2007-2014 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.
+*/
+
+#ifndef _MULTIPLEXED_READER_H_
+#define _MULTIPLEXED_READER_H_
+
+#include "data/fileio/AudioFileReader.h"
+
+#include <QString>
+#include <QList>
+
+typedef std::vector<float> SampleBlock;
+
+class MultiplexedReader : public QObject
+{
+    Q_OBJECT
+
+public:
+    MultiplexedReader(QList<AudioFileReader *> readers);
+    virtual ~MultiplexedReader() { }
+
+    //!!! the rest of this is currently still from AudioFileReader.h! Finish!
+
+
+
+
+    bool isOK() const { return (m_channelCount > 0); }
+
+    virtual QString getError() const { return ""; }
+
+    int getFrameCount() const { return m_frameCount; }
+    int getChannelCount() const { return m_channelCount; }
+    int getSampleRate() const { return m_sampleRate; }
+
+    virtual int getNativeRate() const { return m_sampleRate; } // if resampled
+
+    /**
+     * Return true if this file supports fast seek and random
+     * access. Typically this will be true for uncompressed formats
+     * and false for compressed ones.
+     */
+    virtual bool isQuicklySeekable() const = 0;
+
+    /** 
+     * Return interleaved samples for count frames from index start.
+     * The resulting sample block will contain count *
+     * getChannelCount() samples (or fewer if end of file is reached).
+     *
+     * The subclass implementations of this function must be
+     * thread-safe -- that is, safe to call from multiple threads with
+     * different arguments on the same object at the same time.
+     */
+    virtual void getInterleavedFrames(int start, int count,
+				      SampleBlock &frames) const = 0;
+
+    /**
+     * Return de-interleaved samples for count frames from index
+     * start.  Implemented in this class (it calls
+     * getInterleavedFrames and de-interleaves).  The resulting vector
+     * will contain getChannelCount() sample blocks of count samples
+     * each (or fewer if end of file is reached).
+     */
+    virtual void getDeInterleavedFrames(int start, int count,
+                                        std::vector<SampleBlock> &frames) const;
+
+    // only subclasses that do not know exactly how long the audio
+    // file is until it's been completely decoded should implement this
+    virtual int getDecodeCompletion() const { return 100; } // %
+
+    virtual bool isUpdating() const { return false; }
+
+signals:
+    void frameCountChanged();
+    
+protected:
+    int m_frameCount;
+    int m_channelCount;
+    int m_sampleRate;
+};
+
+#endif
diff -r 76d9d86ae6cd -r de76b2df518f runner/main.cpp
--- a/runner/main.cpp	Wed Oct 01 17:50:58 2014 +0100
+++ b/runner/main.cpp	Wed Oct 01 18:38:32 2014 +0100
@@ -233,15 +233,12 @@
     cerr << "                      Summarise in segments, with segment boundaries" << endl;
     cerr << "                      at A, B, ... seconds." << endl;
     cerr << endl;
-
-/*!!! This feature not implemented yet (sniff)
     cerr << "  -m, --multiplex     If multiple input audio files are given, use mono" << endl;
     cerr << "                      mixdowns of all files as the input channels for a single" << endl;
     cerr << "                      invocation of each transform, instead of running the" << endl;
-    cerr << "                      transform against all files separately." << endl;
+    cerr << "                      transform against all files separately. The first file" << endl;
+    cerr << "                      will be used for output reference name and sample rate." << endl;
     cerr << endl;
-*/
-
     cerr << "  -r, --recursive     If any of the <audio> arguments is found to be a local" << endl;
     cerr << "                      directory, search the tree starting at that directory" << endl;
     cerr << "                      for all supported audio files and take all of those as" << endl;
@@ -365,7 +362,7 @@
     set<string> requestedDefaultTransforms;
     set<string> requestedSummaryTypes;
     bool force = false;
-//!!!    bool multiplex = false;
+    bool multiplex = false;
     bool recursive = false;
     bool list = false;
     bool summaryOnly = false;
@@ -488,13 +485,9 @@
                     }
                 }
             }
-/*!!!
         } else if (arg == "-m" || arg == "--multiplex") {
             multiplex = true;
-            cerr << myname.toStdString()
-                 << ": WARNING: Multiplex argument not yet implemented" << endl; //!!!
             continue;
-*/
         } else if (arg == "-r" || arg == "--recursive") {
             recursive = true;
             continue;
@@ -702,7 +695,7 @@
     for (QStringList::const_iterator i = sources.begin();
          i != sources.end(); ++i) {
         try {
-            manager.addSource(*i);
+            manager.addSource(*i, multiplex);
         } catch (const std::exception &e) {
             badSources.insert(*i);
             cerr << "ERROR: Failed to process file \"" << i->toStdString()
@@ -747,26 +740,41 @@
     }
 
     if (good) {
-        for (QStringList::const_iterator i = sources.begin();
-             i != sources.end(); ++i) {
-            if (badSources.contains(*i)) continue;
-            std::cerr << "Extracting features for: \"" << i->toStdString() << "\"" << std::endl;
+        QStringList goodSources;
+        foreach (QString source, sources) {
+            if (!badSources.contains(source)) {
+                goodSources.push_back(source);
+            }
+        }
+        if (multiplex) {
             try {
-                manager.extractFeatures(*i, force);
+                manager.extractFeaturesMultiplexed(goodSources);
             } catch (const std::exception &e) {
-                cerr << "ERROR: Feature extraction failed for \"" << i->toStdString()
-                     << "\": " << e.what() << endl;
-                if (force) {
-                    // print a note only if we have more files to process
-                    QStringList::const_iterator j = i;
-                    if (++j != sources.end()) {
-                        cerr << "NOTE: \"--force\" option was provided, continuing (more errors may occur)" << endl;
+                cerr << "ERROR: Feature extraction failed: "
+                     << e.what() << endl;
+            }
+        } else {
+            for (QStringList::const_iterator i = goodSources.begin();
+                 i != goodSources.end(); ++i) {
+                std::cerr << "Extracting features for: \"" << i->toStdString()
+                          << "\"" << std::endl;
+                try {
+                    manager.extractFeatures(*i, force);
+                } catch (const std::exception &e) {
+                    cerr << "ERROR: Feature extraction failed for \""
+                         << i->toStdString() << "\": " << e.what() << endl;
+                    if (force) {
+                        // print a note only if we have more files to process
+                        QStringList::const_iterator j = i;
+                        if (++j != sources.end()) {
+                            cerr << "NOTE: \"--force\" option was provided, continuing (more errors may occur)" << endl;
+                        }
+                    } else {
+                        cerr << "NOTE: If you want to continue with processing any further files after an" << endl
+                             << "error like this, use the --force option" << endl;
+                        good = false;
+                        break;
                     }
-                } else {
-                    cerr << "NOTE: If you want to continue with processing any further files after an" << endl
-                         << "error like this, use the --force option" << endl;
-                    good = false;
-                    break;
                 }
             }
         }