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-rw-r--r--demos/spectrum/app/wavfile.cpp168
1 files changed, 89 insertions, 79 deletions
diff --git a/demos/spectrum/app/wavfile.cpp b/demos/spectrum/app/wavfile.cpp
index b9467e3..74d5918 100644
--- a/demos/spectrum/app/wavfile.cpp
+++ b/demos/spectrum/app/wavfile.cpp
@@ -76,80 +76,84 @@ struct CombinedHeader
{
RIFFHeader riff;
WAVEHeader wave;
- DATAHeader data;
};
-static const int HeaderLength = sizeof(CombinedHeader);
WavFile::WavFile(const QAudioFormat &format, qint64 dataLength)
- : m_format(format)
- , m_dataLength(dataLength)
+ : m_format(format)
+ , m_dataLength(dataLength)
+ , m_dataPosition(0)
{
-
}
bool WavFile::readHeader(QIODevice &device)
{
- bool result = true;
-
- if (!device.isSequential())
- result = device.seek(0);
- // else, assume that current position is the start of the header
-
- if (result) {
- CombinedHeader header;
- result = (device.read(reinterpret_cast<char *>(&header), HeaderLength) == HeaderLength);
- if (result) {
- if ((memcmp(&header.riff.descriptor.id, "RIFF", 4) == 0
- || memcmp(&header.riff.descriptor.id, "RIFX", 4) == 0)
- && memcmp(&header.riff.type, "WAVE", 4) == 0
- && memcmp(&header.wave.descriptor.id, "fmt ", 4) == 0
- && header.wave.audioFormat == 1 // PCM
- ) {
- if (memcmp(&header.riff.descriptor.id, "RIFF", 4) == 0)
- m_format.setByteOrder(QAudioFormat::LittleEndian);
- else
- m_format.setByteOrder(QAudioFormat::BigEndian);
-
- m_format.setChannels(qFromLittleEndian<quint16>(header.wave.numChannels));
- m_format.setCodec("audio/pcm");
- m_format.setFrequency(qFromLittleEndian<quint32>(header.wave.sampleRate));
- m_format.setSampleSize(qFromLittleEndian<quint16>(header.wave.bitsPerSample));
-
- switch(header.wave.bitsPerSample) {
- case 8:
- m_format.setSampleType(QAudioFormat::UnSignedInt);
- break;
- case 16:
- m_format.setSampleType(QAudioFormat::SignedInt);
- break;
- default:
- result = false;
- }
-
- m_dataLength = device.size() - HeaderLength;
- } else {
- result = false;
- }
+ if (!device.isSequential()) {
+ if (!device.seek(0))
+ return false;
+ // XXX: else, assume that current position is the start of the header
+ }
+
+ CombinedHeader header;
+ if (device.read(reinterpret_cast<char *>(&header), sizeof(CombinedHeader)) != sizeof(CombinedHeader))
+ return false;
+
+ if ((memcmp(&header.riff.descriptor.id, "RIFF", 4) == 0
+ || memcmp(&header.riff.descriptor.id, "RIFX", 4) == 0)
+ && memcmp(&header.riff.type, "WAVE", 4) == 0
+ && memcmp(&header.wave.descriptor.id, "fmt ", 4) == 0
+ && (header.wave.audioFormat == 1 || header.wave.audioFormat == 0)) {
+
+ // Read off remaining header information
+ DATAHeader dataHeader;
+
+ if (qFromLittleEndian<quint32>(header.wave.descriptor.size) > sizeof(WAVEHeader)) {
+ // Extended data available
+ quint16 extraFormatBytes;
+ if (device.peek((char*)&extraFormatBytes, sizeof(quint16)) != sizeof(quint16))
+ return false;
+ const qint64 throwAwayBytes = sizeof(quint16) + qFromLittleEndian<quint16>(extraFormatBytes);
+ if (device.read(throwAwayBytes).size() != throwAwayBytes)
+ return false;
}
+
+ if (device.read((char*)&dataHeader, sizeof(DATAHeader)) != sizeof(DATAHeader))
+ return false;
+
+ // Establish format
+ if (memcmp(&header.riff.descriptor.id, "RIFF", 4) == 0)
+ m_format.setByteOrder(QAudioFormat::LittleEndian);
+ else
+ m_format.setByteOrder(QAudioFormat::BigEndian);
+
+ int bps = qFromLittleEndian<quint16>(header.wave.bitsPerSample);
+ m_format.setChannels(qFromLittleEndian<quint16>(header.wave.numChannels));
+ m_format.setCodec("audio/pcm");
+ m_format.setFrequency(qFromLittleEndian<quint32>(header.wave.sampleRate));
+ m_format.setSampleSize(qFromLittleEndian<quint16>(header.wave.bitsPerSample));
+ m_format.setSampleType(bps == 8 ? QAudioFormat::UnSignedInt : QAudioFormat::SignedInt);
+
+ m_dataLength = qFromLittleEndian<quint32>(dataHeader.descriptor.size);
+ m_dataPosition = 0;
}
- return result;
+ return true;
}
bool WavFile::writeHeader(QIODevice &device)
{
CombinedHeader header;
+ DATAHeader dataHeader;
- memset(&header, 0, HeaderLength);
+ memset(&header, 0, sizeof(CombinedHeader));
// RIFF header
if (m_format.byteOrder() == QAudioFormat::LittleEndian)
strncpy(&header.riff.descriptor.id[0], "RIFF", 4);
else
strncpy(&header.riff.descriptor.id[0], "RIFX", 4);
- qToLittleEndian<quint32>(quint32(m_dataLength + HeaderLength - 8),
+ qToLittleEndian<quint32>(quint32(m_dataLength + sizeof(CombinedHeader) + sizeof(DATAHeader) - sizeof(chunk)),
reinterpret_cast<unsigned char*>(&header.riff.descriptor.size));
strncpy(&header.riff.type[0], "WAVE", 4);
@@ -171,11 +175,12 @@ bool WavFile::writeHeader(QIODevice &device)
reinterpret_cast<unsigned char*>(&header.wave.bitsPerSample));
// DATA header
- strncpy(&header.data.descriptor.id[0], "data", 4);
+ strncpy(dataHeader.descriptor.id, "data", 4);
qToLittleEndian<quint32>(quint32(m_dataLength),
- reinterpret_cast<unsigned char*>(&header.data.descriptor.size));
+ reinterpret_cast<unsigned char*>(&dataHeader.descriptor.size));
- return (device.write(reinterpret_cast<const char *>(&header), HeaderLength) == HeaderLength);
+ return device.write(reinterpret_cast<const char *>(&header), sizeof(CombinedHeader)) == sizeof(CombinedHeader)
+ && device.write(reinterpret_cast<const char*>(&dataHeader), sizeof(DATAHeader)) == sizeof(DATAHeader);
}
const QAudioFormat& WavFile::format() const
@@ -190,7 +195,7 @@ qint64 WavFile::dataLength() const
qint64 WavFile::headerLength()
{
- return HeaderLength;
+ return sizeof(CombinedHeader);
}
bool WavFile::writeDataLength(QIODevice &device, qint64 dataLength)
@@ -205,42 +210,47 @@ bool WavFile::writeDataLength(QIODevice &device, qint64 dataLength)
return result;
}
-#include <QFile>
-#include <QTextStream>
-
qint64 WavFile::readData(QIODevice &device, QByteArray &buffer,
QAudioFormat outputFormat)
{
- if (QAudioFormat() == outputFormat)
+ // Sanity checks
+ if (!outputFormat.isValid())
outputFormat = m_format;
+ if (!isPCMS16LE(outputFormat) || !isPCMS16LE(m_format))
+ return 0;
+
+ if (m_dataPosition == m_dataLength)
+ return 0;
+
+ // Process
qint64 result = 0;
- QFile file("wav.txt");
- file.open(QIODevice::WriteOnly | QIODevice::Text);
- QTextStream stream;
- stream.setDevice(&file);
-
- if (isPCMS16LE(outputFormat) && isPCMS16LE(m_format)) {
- QVector<char> inputSample(2 * m_format.channels());
-
- qint16 *output = reinterpret_cast<qint16*>(buffer.data());
-
- while (result < buffer.size()) {
- if (device.read(inputSample.data(), inputSample.count())) {
- int inputIdx = 0;
- for (int outputIdx = 0; outputIdx < outputFormat.channels(); ++outputIdx) {
- const qint16* input = reinterpret_cast<const qint16*>(inputSample.data() + 2 * inputIdx);
- *output++ = qFromLittleEndian<qint16>(*input);
- result += 2;
- if (inputIdx < m_format.channels())
- ++inputIdx;
- }
- } else {
- break;
+ const int frameSize = 2 * m_format.channels(); // 16 bit samples
+ QVector<char> inputSample(frameSize);
+
+ qint16 *output = reinterpret_cast<qint16*>(buffer.data());
+
+ while (result < buffer.size()) {
+ if (m_dataPosition == m_dataLength)
+ break;
+
+ // XXX only working with particular alignments
+ if (device.read(inputSample.data(), inputSample.count())) {
+ int inputIdx = 0;
+ for (int outputIdx = 0; outputIdx < outputFormat.channels(); ++outputIdx) {
+ const qint16* input = reinterpret_cast<const qint16*>(inputSample.data() + 2 * inputIdx);
+ *output++ = qFromLittleEndian<qint16>(*input);
+ result += 2;
+ if (inputIdx < m_format.channels())
+ ++inputIdx;
}
+ m_dataPosition += frameSize;
+ } else {
+ break;
}
}
+
return result;
}
generated by cgit v0.12 at 2024-11-11 23:23:32 (GMT)