view data/fileio/test/AudioFileReaderTest.h @ 1310:aa1b1fc2d018 mp3-gapless

Stop reporting sync errors only when we really are at eof, i.e. after the input callback has been called again (previously we just tested whether we'd buffered up all the input, which of course we do in one go at the start)

/* -*- 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 2013 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.
*/

#ifndef TEST_AUDIO_FILE_READER_H
#define TEST_AUDIO_FILE_READER_H

#include "../AudioFileReaderFactory.h"
#include "../AudioFileReader.h"

#include "AudioTestData.h"

#include <cmath>

#include <QObject>
#include <QtTest>
#include <QDir>

#include <iostream>

using namespace std;

static QString audioDir = "svcore/data/fileio/test/testfiles";

class AudioFileReaderTest : public QObject
{
    Q_OBJECT

    const char *strOf(QString s) {
        return strdup(s.toLocal8Bit().data());
    }

private slots:
    void init()
    {
        if (!QDir(audioDir).exists()) {
            cerr << "ERROR: Audio test file directory \"" << audioDir << "\" does not exist" << endl;
            QVERIFY2(QDir(audioDir).exists(), "Audio test file directory not found");
        }
    }

    void read_data()
    {
        QTest::addColumn<QString>("audiofile");
        QStringList files = QDir(audioDir).entryList(QDir::Files);
        foreach (QString filename, files) {
            QTest::newRow(strOf(filename)) << filename;
        }
    }

    void read()
    {
        QFETCH(QString, audiofile);

        sv_samplerate_t readRate = 48000;

	AudioFileReader *reader =
	    AudioFileReaderFactory::createReader
	    (audioDir + "/" + audiofile, readRate);

        QStringList fileAndExt = audiofile.split(".");
        QStringList bits = fileAndExt[0].split("-");
        QString extension = fileAndExt[1];
        sv_samplerate_t nominalRate = bits[0].toInt();
        int nominalChannels = bits[1].toInt();
        int nominalDepth = 16;
        if (bits.length() > 2) nominalDepth = bits[2].toInt();

	if (!reader) {
#if ( QT_VERSION >= 0x050000 )
	    QSKIP("Unsupported file, skipping");
#else
	    QSKIP("Unsupported file, skipping", SkipSingle);
#endif
	}

        QCOMPARE((int)reader->getChannelCount(), nominalChannels);
        QCOMPARE(reader->getNativeRate(), nominalRate);
        QCOMPARE(reader->getSampleRate(), readRate);

	int channels = reader->getChannelCount();
	AudioTestData tdata(readRate, channels);
	
	float *reference = tdata.getInterleavedData();
        sv_frame_t refFrames = tdata.getFrameCount();
	
	// The reader should give us exactly the expected number of
	// frames, except for mp3/aac files. We ask for quite a lot
	// more, though, so we can (a) check that we only get the
	// expected number back (if this is not mp3/aac) or (b) take
	// into account silence at beginning and end (if it is).
	vector<float> test = reader->getInterleavedFrames(0, refFrames + 5000);
	sv_frame_t read = test.size() / channels;

        if (extension == "mp3" || extension == "aac" || extension == "m4a") {
            // mp3s and aacs can have silence at start and end
            QVERIFY(read >= refFrames);
        } else {
            QCOMPARE(read, refFrames);
        }

        // Our limits are pretty relaxed -- we're not testing decoder
        // or resampler quality here, just whether the results are
        // plainly wrong (e.g. at wrong samplerate or with an offset).

	double maxLimit = 0.01;
        double meanLimit = 0.001;
        double edgeLimit = maxLimit * 10; // in first or final edgeSize frames
        int edgeSize = 100; 

        if (nominalDepth < 16) {
            maxLimit = 0.02;
            meanLimit = 0.02;
        } else if (extension == "ogg" || extension == "mp3") {
            maxLimit = 0.1;
            meanLimit = 0.035;
            edgeLimit = maxLimit * 3;
        } else if (extension == "aac" || extension == "m4a") {
            maxLimit = 0.3; // seems max diff can be quite large here
                            // even when mean is fairly small
            meanLimit = 0.01;
            edgeLimit = maxLimit * 3;
        }

        // And we ignore completely the last few frames when upsampling
        int discard = 1 + int(round(readRate / nominalRate));

        int offset = 0;

        if (extension == "aac" || extension == "m4a") {
            // our m4a file appears to have a fixed offset of 1024 (at
            // file sample rate)
            //            offset = int(round((1024 / nominalRate) * readRate));
            offset = 0;
        }

        if (extension == "mp3") {
            // ...while mp3s appear to vary. What we're looking for is
            // the first peak of the sinusoid in the first channel
            // (since we may have only the one channel). This should
            // appear at 0.4ms (see AudioTestData.h)
            int expectedPeak = int(0.0004 * readRate);
//            std::cerr << "expectedPeak = " << expectedPeak << std::endl;
            for (int i = 1; i < read; ++i) {
                if (test[i * channels] > 0.8 &&
                    test[(i+1) * channels] < test[i * channels]) {
                    offset = i - expectedPeak - 1;
//                    std::cerr << "actual peak = " << i-1 << std::endl;
                    break;
                }
            }
//            std::cerr << "offset = " << offset << std::endl;
        }

	for (int c = 0; c < channels; ++c) {
            
	    float maxdiff = 0.f;
	    int maxAt = 0;
	    float totdiff = 0.f;

	    for (int i = 0; i < refFrames; ++i) {
                int ix = i + offset;
                if (ix >= read) {
                    cerr << "ERROR: audiofile " << audiofile << " reads truncated (read-rate reference frames " << i << " onward, of " << refFrames << ", are lost)" << endl;
                    QVERIFY(ix < read);
                }
                if (ix + discard >= read) {
                    // we forgive the very edge samples when
                    // resampling (discard > 0)
                    continue;
                }
		float diff = fabsf(test[ix * channels + c] -
				   reference[i * channels + c]);
		totdiff += diff;
                // in edge areas, record this only if it exceeds edgeLimit
                if (i < edgeSize || i + edgeSize >= read - offset) {
                    if (diff > edgeLimit && diff > maxdiff) {
                        maxdiff = diff;
                        maxAt = i;
                    }
                } else {
                    if (diff > maxdiff) {
                        maxdiff = diff;
                        maxAt = i;
                    }
		}
	    }

            // check for spurious material at end
            for (sv_frame_t i = refFrames; i + offset < read; ++i) {
                sv_frame_t ix = i + offset;
                float quiet = 1e-6f;
                float mag = fabsf(test[ix * channels + c]);
                if (mag > quiet) {
                    cerr << "ERROR: audiofile " << audiofile << " contains spurious data after end of reference (found sample " << test[ix * channels + c] << " at index " << ix << " of channel " << c << ")" << endl;
                    QVERIFY(mag < quiet);
                }
            }
                
	    float meandiff = totdiff / float(read);
//	    cerr << "meandiff on channel " << c << ": " << meandiff << endl;
//	    cerr << "maxdiff on channel " << c << ": " << maxdiff << " at " << maxAt << endl;
            if (meandiff >= meanLimit) {
		cerr << "ERROR: for audiofile " << audiofile << ": mean diff = " << meandiff << " for channel " << c << endl;
                QVERIFY(meandiff < meanLimit);
            }
	    if (maxdiff >= maxLimit) {
		cerr << "ERROR: for audiofile " << audiofile << ": max diff = " << maxdiff << " at frame " << maxAt << " of " << read << " on channel " << c << " (mean diff = " << meandiff << ")" << endl;
		QVERIFY(maxdiff < maxLimit);
	    }
	}
    }
};

#endif