On Fri, 12 Jul 2013 08:30:14 +0200
"Sean M. Pappalardo - D.J. Pegasus"
<spappalardo-opwvymzfgylytjvyw6y...@public.gmane.org> wrote:
> On 07/10/2013 09:51 PM, RJ Ryan wrote:
> > Yes! If you want to use the position scratch controller in the engine
> > then that's one way you could tell Mixxx to move smoothly to a position.
> > I was assuming you wanted to work more like vinyl control though in that
> > it would control Mixxx's normal playback rate.
> >
> > To do that,
> > set [ChannelX],scratch_position_enable 1
> > set [ChannelX],scratch_position to the desired position delta from the
> > current position
> >
> > This is how the mouse tells mixxx to scratch back and forth from the
> > position at which enable was changed to 1.
>
> This sounds a bit closer to what I'm looking for to fully support
> moving-platter controllers (please add it to the wiki,) but what about
> when time stamps are provided, as which moving-platter controllers do.
> (I was under the impression that the engine still doesn't have a way to
> handle those.)
I'd really appreciate it if the wiki could be updated with this message type
incl. resolution/limitations. I understand that how often it can actually be
called is another issue but that'd be a good start.
Sean - is your Serato driver the only one with SysEx-based messages? From your
experience do you think SysEx can be used to pass around any type of binary
data?
I attached an 8/7-bit transcoder (8->7 in C++, 7->8 in javascript), but haven't
tested it on Mixxx yet.
thx & cheers,
-- p
// Midi SysEx encoder (C++) and decoder (javascript)
//---- Encode 8-to-7-bit (C++) -------------------------------------------------
SysExEncoder::SysExEncoder(const std::vector<uint8_t> &src_bin_data)
{
const size_t src_bin_sz = src_bin_data.size();
wxASSERT(src_bin_sz > 0);
const size_t calc_enc_sz = ((src_bin_sz * 8 * 8 / 7) + 7) >> 3;
m_Encoded7Data.resize(calc_enc_sz, 0);
for (int i = 0, j = 0; i < src_bin_sz; i++, j++)
{
const int ind = (i % 7);
if (ind == 0)
{ // reserve mask
m_Encoded7Data[j++] = 0;
}
const uint8_t c = src_bin_data[i];
const size_t mask_ind = j - (ind + 1);
// store high-bit
m_Encoded7Data[mask_ind] |= (c & 0x80) >> (ind + 1);
// store lower 7 bits
m_Encoded7Data[j] = c & 0x7F;
}
}
//---- Decode7 (javascript) ----------------------------------------------------
function Decode7(encoded7_data)
{
var dec8data = [];
var mask = 0;
for (var i = 0, j = 0; i < encoded7_data.length; i++, j++)
{ if (0 == (i & 7))
{ // get new mask
mask = encoded7_data[i++];
}
// recompute cycle index
var ind = (i & 7);
// retrieve high-bit
var highbit = (mask & (0x80 >> ind)) << ind;
// combine low-7 with high-bit
dec8data[j] = encoded7_data[i] | highbit;
}
return dec8data;
}
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