void AudioBufferContainer::Resize(int nCh, int nFrames, bool preserveData)
{
if (!m_hasData)
{
preserveData = false;
}
const int newsz = nCh*nFrames*(int)m_fmt;
if (preserveData && (nCh != m_nCh || nFrames != m_nFrames))
{
GetAllChannels(m_fmt, true); // causes m_data to be interleaved
if (newsz > m_data.GetSize()) m_data.Resize(newsz);
if (nCh != m_nCh && m_data.GetSize() >= newsz)
{
char *out = (char *)m_data.Get();
const char *in = out;
const int in_adv = m_nCh * m_fmt, out_adv = nCh * m_fmt;
const int copysz = min(in_adv,out_adv);
int n = min(nFrames,m_nFrames);
if (out_adv < in_adv) // decreasing channel count, left to right
{
while (n--)
{
if (out!=in) memmove(out,in,copysz);
out+=out_adv;
in+=in_adv;
}
}
else // increasing channel count, copy right to left
{
out += n * out_adv;
in += n * in_adv;
while (n--)
{
out-=out_adv;
in-=in_adv;
if (out!=in) memmove(out,in,copysz);
}
}
// adjust interleaving
}
}
m_data.Resize(newsz);
m_hasData = preserveData;
m_nCh = nCh;
m_nFrames = nFrames;
}
void AudioBufferContainer::Resize(int nCh, int nFrames, bool preserveData)
{
if (!m_hasData)
{
preserveData = false;
}
int newsz = nCh*nFrames*(int)m_fmt;
if (preserveData && (nCh != m_nCh || nFrames != m_nFrames))
{
GetAllChannels(m_fmt, true); // causes m_data to be interleaved
}
m_data.Resize(newsz);
m_hasData = preserveData;
m_nCh = nCh;
m_nFrames = nFrames;
}
// src=NULL to memset(0)
void* AudioBufferContainer::SetAllChannels(int fmt, void* src, int nCh, int nFrames)
{
Reformat(fmt, false);
Resize(nCh, nFrames, false);
int sz = nCh*nFrames*(int)fmt;
void* dest = GetAllChannels(fmt, false);
if (src)
{
memcpy(dest, src, sz);
}
else
{
memset(dest, 0, sz);
}
m_interleaved = true;
m_hasData = true;
return dest;
}
