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Make mixer ioctls load from a memory buffer rather than a file. This is prep for uploading the memory buffer to IO to be processed there.

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This commit is contained in:
px4dev
2012-12-29 00:01:04 -08:00
parent f0da789626
commit 35c82ff2fc
10 changed files with 536 additions and 464 deletions
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apps/systemlib/mixer/mixer.cpp
+7 -81
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@@ -137,89 +137,15 @@ NullMixer::groups_required(uint32_t &groups)
}
/****************************************************************************/
SimpleMixer::SimpleMixer(ControlCallback control_cb,
uintptr_t cb_handle,
mixer_simple_s *mixinfo) :
Mixer(control_cb, cb_handle),
_info(mixinfo)
NullMixer *
NullMixer::from_text(const char *buf, unsigned &buflen)
{
}
NullMixer *nm = nullptr;
SimpleMixer::~SimpleMixer()
{
if (_info != nullptr)
free(_info);
}
unsigned
SimpleMixer::mix(float *outputs, unsigned space)
{
float sum = 0.0f;
if (_info == nullptr)
return 0;
if (space < 1)
return 0;
for (unsigned i = 0; i < _info->control_count; i++) {
float input;
_control_cb(_cb_handle,
_info->controls[i].control_group,
_info->controls[i].control_index,
input);
sum += scale(_info->controls[i].scaler, input);
if ((buflen >= 2) && (buf[0] == 'Z') && (buf[1] == ':')) {
nm = new NullMixer;
buflen -= 2;
}
*outputs = scale(_info->output_scaler, sum);
return 1;
}
void
SimpleMixer::groups_required(uint32_t &groups)
{
for (unsigned i = 0; i < _info->control_count; i++)
groups |= 1 << _info->controls[i].control_group;
}
int
SimpleMixer::check()
{
int ret;
float junk;
/* sanity that presumes that a mixer includes a control no more than once */
/* max of 32 groups due to groups_required API */
if (_info->control_count > 32)
return -2;
/* validate the output scaler */
ret = scale_check(_info->output_scaler);
if (ret != 0)
return ret;
/* validate input scalers */
for (unsigned i = 0; i < _info->control_count; i++) {
/* verify that we can fetch the control */
if (_control_cb(_cb_handle,
_info->controls[i].control_group,
_info->controls[i].control_index,
junk) != 0) {
return -3;
}
/* validate the scaler */
ret = scale_check(_info->controls[i].scaler);
if (ret != 0)
return (10 * i + ret);
}
return 0;
return nm;
}