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HardwareBypass.cpp
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HardwareBypass.cpp
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#include <lv2.h>
#include <alsa/asoundlib.h>
/**********************************************************************************************************************************************************/
#ifdef __aarch64__
#define ALSA_SOUNDCARD_ID "hw:DUOX"
#else
#define ALSA_SOUNDCARD_ID "hw:MODDUO"
#endif
#define ALSA_CONTROL_BYPASS_LEFT "Left True-Bypass"
#define ALSA_CONTROL_BYPASS_RIGHT "Right True-Bypass"
#define PLUGIN_URI "http://moddevices.com/plugins/mod-devel/HardwareBypass"
enum {ENABLED, MODE, PLUGIN_PORT_COUNT};
/**********************************************************************************************************************************************************/
struct AlsaControls {
snd_mixer_t* mixer;
snd_mixer_elem_t* left;
snd_mixer_elem_t* right;
AlsaControls()
: mixer(NULL), left(NULL), right(NULL) {}
};
class HardwareBypassPlugin
{
public:
HardwareBypassPlugin() {}
~HardwareBypassPlugin() {}
static LV2_Handle instantiate(const LV2_Descriptor*, double, const char*, const LV2_Feature* const*);
static void connect_port(LV2_Handle instance, uint32_t port, void *data);
static void run(LV2_Handle instance, uint32_t n_samples);
static void cleanup(LV2_Handle instance);
const float *enabled;
const float *mode;
AlsaControls alsa;
bool first_run;
bool last_enabled;
int last_mode;
};
/**********************************************************************************************************************************************************/
static const LV2_Descriptor Descriptor = {
PLUGIN_URI,
HardwareBypassPlugin::instantiate,
HardwareBypassPlugin::connect_port,
NULL,
HardwareBypassPlugin::run,
NULL,
HardwareBypassPlugin::cleanup,
NULL
};
/**********************************************************************************************************************************************************/
LV2_SYMBOL_EXPORT
const LV2_Descriptor* lv2_descriptor(uint32_t index)
{
if (index == 0) return &Descriptor;
else return NULL;
}
/**********************************************************************************************************************************************************/
LV2_Handle HardwareBypassPlugin::instantiate(const LV2_Descriptor*, double, const char*, const LV2_Feature* const*)
{
AlsaControls alsa;
if (snd_mixer_open(&alsa.mixer, SND_MIXER_ELEM_SIMPLE) != 0)
return NULL;
snd_mixer_selem_id_t* sid;
if (snd_mixer_attach(alsa.mixer, ALSA_SOUNDCARD_ID) == 0 &&
snd_mixer_selem_register(alsa.mixer, NULL, NULL) == 0 &&
snd_mixer_load(alsa.mixer) == 0 &&
snd_mixer_selem_id_malloc(&sid) == 0)
{
snd_mixer_selem_id_set_index(sid, 0);
snd_mixer_selem_id_set_name(sid, ALSA_CONTROL_BYPASS_LEFT);
alsa.left = snd_mixer_find_selem(alsa.mixer, sid);
snd_mixer_selem_id_set_index(sid, 0);
snd_mixer_selem_id_set_name(sid, ALSA_CONTROL_BYPASS_RIGHT);
alsa.right = snd_mixer_find_selem(alsa.mixer, sid);
snd_mixer_selem_id_free(sid);
}
else
{
snd_mixer_close(alsa.mixer);
return NULL;
}
if (alsa.left == NULL || alsa.right == NULL)
{
snd_mixer_close(alsa.mixer);
return NULL;
}
HardwareBypassPlugin *plugin = new HardwareBypassPlugin();
plugin->alsa = alsa;
plugin->first_run = true;
plugin->last_enabled = false;
plugin->last_mode = 0;
return (LV2_Handle)plugin;
}
/**********************************************************************************************************************************************************/
void HardwareBypassPlugin::connect_port(LV2_Handle instance, uint32_t port, void *data)
{
HardwareBypassPlugin *plugin;
plugin = (HardwareBypassPlugin *) instance;
switch (port)
{
case ENABLED:
plugin->enabled = (const float*) data;
break;
case MODE:
plugin->mode = (const float*) data;
break;
}
}
/**********************************************************************************************************************************************************/
static void set_alsa_state(const AlsaControls& alsa, const bool enabled, const int mode)
{
int left = 0, right = 0;
if (enabled)
{
switch (mode)
{
case 0:
left = 1;
right = 1;
break;
case 1:
left = 1;
break;
case 2:
right = 1;
break;
}
}
snd_mixer_selem_set_playback_switch_all(alsa.left, left);
snd_mixer_selem_set_playback_switch_all(alsa.right, right);
}
void HardwareBypassPlugin::run(LV2_Handle instance, uint32_t n_samples)
{
HardwareBypassPlugin *plugin;
plugin = (HardwareBypassPlugin *) instance;
const bool enabled = *plugin->enabled > 0.5f;
const int mode = (int)(*plugin->mode + 0.5f);
if (plugin->first_run)
{
plugin->first_run = false;
plugin->last_enabled = enabled;
plugin->last_mode = mode;
set_alsa_state(plugin->alsa, enabled, mode);
}
else if (plugin->last_enabled != enabled || plugin->last_mode != mode)
{
plugin->last_enabled = enabled;
plugin->last_mode = mode;
set_alsa_state(plugin->alsa, enabled, mode);
}
}
/**********************************************************************************************************************************************************/
void HardwareBypassPlugin::cleanup(LV2_Handle instance)
{
delete ((HardwareBypassPlugin *) instance);
}