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Restructure the source code a little.

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Change-Id: I995b0fb33bdda7f01bf6266c1c50a1b17eba6760
Reviewed-by: Jonas Rabbe <jonas.rabbe@nokia.com>
This commit is contained in:
Michael Goddard
2012-01-04 16:05:55 +10:00
committed by Qt by Nokia
parent 6ee1977d60
commit 502d3c8eb3
123 changed files with 198 additions and 169 deletions
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307
src/multimedia/audio/qwavedecoder_p.cpp Normal file
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/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qwavedecoder_p.h"
#include <QtCore/qtimer.h>
#include <QtCore/qendian.h>
QT_BEGIN_NAMESPACE
QWaveDecoder::QWaveDecoder(QIODevice *s, QObject *parent):
QIODevice(parent),
haveFormat(false),
dataSize(0),
source(s),
state(QWaveDecoder::InitialState),
junkToSkip(0),
bigEndian(false)
{
open(QIODevice::ReadOnly | QIODevice::Unbuffered);
if (enoughDataAvailable())
QTimer::singleShot(0, this, SLOT(handleData()));
else
connect(source, SIGNAL(readyRead()), SLOT(handleData()));
}
QWaveDecoder::~QWaveDecoder()
{
}
QAudioFormat QWaveDecoder::audioFormat() const
{
return format;
}
int QWaveDecoder::duration() const
{
return size() * 1000 / (format.sampleSize() / 8) / format.channels() / format.frequency();
}
qint64 QWaveDecoder::size() const
{
return haveFormat ? dataSize : 0;
}
bool QWaveDecoder::isSequential() const
{
return source->isSequential();
}
qint64 QWaveDecoder::bytesAvailable() const
{
return haveFormat ? source->bytesAvailable() : 0;
}
qint64 QWaveDecoder::readData(char *data, qint64 maxlen)
{
return haveFormat ? source->read(data, maxlen) : 0;
}
qint64 QWaveDecoder::writeData(const char *data, qint64 len)
{
Q_UNUSED(data);
Q_UNUSED(len);
return -1;
}
void QWaveDecoder::parsingFailed()
{
Q_ASSERT(source);
source->disconnect(SIGNAL(readyRead()), this, SLOT(handleData()));
emit parsingError();
}
void QWaveDecoder::handleData()
{
// As a special "state", if we have junk to skip, we do
if (junkToSkip > 0) {
discardBytes(junkToSkip); // this also updates junkToSkip
// If we couldn't skip all the junk, return
if (junkToSkip > 0) {
// We might have run out
if (source->atEnd())
parsingFailed();
return;
}
}
if (state == QWaveDecoder::InitialState) {
if (source->bytesAvailable() < qint64(sizeof(RIFFHeader)))
return;
RIFFHeader riff;
source->read(reinterpret_cast<char *>(&riff), sizeof(RIFFHeader));
// RIFF = little endian RIFF, RIFX = big endian RIFF
if (((qstrncmp(riff.descriptor.id, "RIFF", 4) != 0) && (qstrncmp(riff.descriptor.id, "RIFX", 4) != 0))
|| qstrncmp(riff.type, "WAVE", 4) != 0) {
parsingFailed();
return;
} else {
state = QWaveDecoder::WaitingForFormatState;
if (qstrncmp(riff.descriptor.id, "RIFX", 4) == 0)
bigEndian = true;
else
bigEndian = false;
}
}
if (state == QWaveDecoder::WaitingForFormatState) {
if (findChunk("fmt ")) {
chunk descriptor;
peekChunk(&descriptor);
if (source->bytesAvailable() < qint64(descriptor.size + sizeof(chunk)))
return;
WAVEHeader wave;
source->read(reinterpret_cast<char *>(&wave), sizeof(WAVEHeader));
if (descriptor.size > sizeof(WAVEHeader))
discardBytes(descriptor.size - sizeof(WAVEHeader));
// Swizzle this
if (bigEndian) {
wave.audioFormat = qFromBigEndian<quint16>(wave.audioFormat);
}
if (wave.audioFormat != 0 && wave.audioFormat != 1) {
// 32bit wave files have format == 0xFFFE (WAVE_FORMAT_EXTENSIBLE).
// but don't support them at the moment.
parsingFailed();
return;
} else {
format.setCodec(QLatin1String("audio/pcm"));
if (bigEndian) {
int bps = qFromBigEndian<quint16>(wave.bitsPerSample);
format.setSampleType(bps == 8 ? QAudioFormat::UnSignedInt : QAudioFormat::SignedInt);
format.setByteOrder(QAudioFormat::BigEndian);
format.setFrequency(qFromBigEndian<quint32>(wave.sampleRate));
format.setSampleSize(bps);
format.setChannels(qFromBigEndian<quint16>(wave.numChannels));
} else {
int bps = qFromLittleEndian<quint16>(wave.bitsPerSample);
format.setSampleType(bps == 8 ? QAudioFormat::UnSignedInt : QAudioFormat::SignedInt);
format.setByteOrder(QAudioFormat::LittleEndian);
format.setFrequency(qFromLittleEndian<quint32>(wave.sampleRate));
format.setSampleSize(bps);
format.setChannels(qFromLittleEndian<quint16>(wave.numChannels));
}
state = QWaveDecoder::WaitingForDataState;
}
}
}
if (state == QWaveDecoder::WaitingForDataState) {
if (findChunk("data")) {
source->disconnect(SIGNAL(readyRead()), this, SLOT(handleData()));
chunk descriptor;
source->read(reinterpret_cast<char *>(&descriptor), sizeof(chunk));
if (bigEndian)
descriptor.size = qFromBigEndian<quint32>(descriptor.size);
dataSize = descriptor.size;
haveFormat = true;
connect(source, SIGNAL(readyRead()), SIGNAL(readyRead()));
emit formatKnown();
return;
}
}
// If we hit the end without finding data, it's a parsing error
if (source->atEnd()) {
parsingFailed();
}
}
bool QWaveDecoder::enoughDataAvailable()
{
chunk descriptor;
if (!peekChunk(&descriptor))
return false;
// This is only called for the RIFF/RIFX header, before bigEndian is set,
// so we have to manually swizzle
if (qstrncmp(descriptor.id, "RIFX", 4) == 0)
descriptor.size = qFromBigEndian<quint32>(descriptor.size);
if (source->bytesAvailable() < qint64(sizeof(chunk) + descriptor.size))
return false;
return true;
}
bool QWaveDecoder::findChunk(const char *chunkId)
{
chunk descriptor;
if (!peekChunk(&descriptor))
return false;
if (qstrncmp(descriptor.id, chunkId, 4) == 0)
return true;
// It's possible that bytes->available() is less than the chunk size
// if it's corrupt.
junkToSkip = qint64(sizeof(chunk) + descriptor.size);
while (source->bytesAvailable() > 0) {
// Skip the current amount
if (junkToSkip > 0)
discardBytes(junkToSkip);
// If we still have stuff left, just exit and try again later
// since we can't call peekChunk
if (junkToSkip > 0)
return false;
if (!peekChunk(&descriptor))
return false;
if (qstrncmp(descriptor.id, chunkId, 4) == 0)
return true;
}
return false;
}
// Handles endianness
bool QWaveDecoder::peekChunk(chunk *pChunk)
{
if (source->bytesAvailable() < qint64(sizeof(chunk)))
return false;
source->peek(reinterpret_cast<char *>(pChunk), sizeof(chunk));
if (bigEndian)
pChunk->size = qFromBigEndian<quint32>(pChunk->size);
return true;
}
void QWaveDecoder::discardBytes(qint64 numBytes)
{
// Discards a number of bytes
// If the iodevice doesn't have this many bytes in it,
// remember how much more junk we have to skip.
if (source->isSequential()) {
QByteArray r = source->read(qMin(numBytes, qint64(16384))); // uggh, wasted memory, limit to a max of 16k
if (r.size() < numBytes)
junkToSkip = numBytes - r.size();
else
junkToSkip = 0;
} else {
quint64 origPos = source->pos();
source->seek(source->pos() + numBytes);
junkToSkip = origPos + numBytes - source->pos();
}
}
QT_END_NAMESPACE
#include "moc_qwavedecoder_p.cpp"