src/wav/nwavestream.cpp

   1 #include "nwavestream.h"
   2 #include "../nSoundBag.h"
   3 #include <QIODevice>
   4
   5
   6 nWaveStream::nWaveStream(QIODevice *device, nSoundFormat format, int frequency, int channels, QObject *parent)
   7     : nSoundStream(parent),
   8       _device(device),
   9       _format(format),
  10       _frequency(frequency),
  11       _channels(channels)
  12 {
  13
  14     if(format == SF_WAVE_HEADER)
  15     {
  16
  17         unsigned char header[44];
  18
  19         device->read(reinterpret_cast<char*>(header), 44);
  20         _channels = header[22];
  21         _frequency = header[24] + (((int)header[25])<<8) + (((int)header[26])<<16) + (((int)header[27])<<24);
  22         _format = (_channels == 1?
  23                        (header[34]==16? SF_16BIT_MONO : SF_8BIT_MONO):
  24                        (header[34]==16? SF_16BIT_STEREO : SF_8BIT_STEREO)
  25                        );
  26         int chunkSize = header[40] + (((int)header[41])<<8) + (((int)header[42])<<16) + (((int)header[43])<<24);
  27         _totalFrames = chunkSize / nSoundFormat_getFramesize(_format);
  28     }
  29     else
  30     {
  31         if(channels < 0) channels = (format == SF_8BIT_STEREO || format  == SF_16BIT_STEREO)? 2 : 1;
  32     }
  33 }
  34
  35 nSoundBag *nWaveStream::createSoundBag(QObject *parent)
  36 {
  37     nSoundBag * bag = new nSoundBag( _format, _totalFrames, _frequency );
  38     read(bag->m_data, _totalFrames);
  39     return bag;
  40 }
  41
  42
  43 void nWaveStream::rewind()
  44 {
  45     _device->reset();
  46 }
  47
  48 quint64 nWaveStream::read(void *data, unsigned long frames)
  49 {
  50     return _device->read( (char *) data, nSoundFormat_getFramesize(_format) * frames ) / nSoundFormat_getFramesize(_format);
  51 }