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channelmix: support Midi volume control

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This commit is contained in:
Wim Taymans 2020-05-13 15:40:37 +02:00
parent 498cb91750
commit fea16cca14
1 changed files with 55 additions and 27 deletions
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48
spa/plugins/audioconvert/channelmix.c
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@ -386,6 +386,25 @@ static int apply_props(struct impl *this, const struct spa_pod *param)
return changed;
}
static int apply_midi(struct impl *this, const struct spa_pod *value)
{
const uint8_t *val = SPA_POD_BODY(value);
uint32_t size = SPA_POD_BODY_SIZE(value);
struct props *p = &this->props;
if (size < 3)
return -EINVAL;
if ((val[0] & 0xf0) != 0xb0 || val[1] != 7)
return 0;
p->volume = val[2] / 127.0;
if (this->mix.set_volume)
channelmix_set_volume(&this->mix, p->volume, p->mute,
p->n_channel_volumes, p->channel_volumes);
return 1;
}
static int impl_node_set_io(void *object, uint32_t id, void *data, size_t size)
{
return -ENOTSUP;
@ -448,7 +467,7 @@ impl_node_add_listener(void *object,
{
struct impl *this = object;
struct spa_hook_list save;
struct spa_dict_item items[1];
struct spa_dict_item items[2];
uint32_t n_items = 0;
spa_return_val_if_fail(this != NULL, -EINVAL);
@ -461,6 +480,7 @@ impl_node_add_listener(void *object,
struct port *control_port = GET_CONTROL_PORT(this, 1);
items[n_items++] = SPA_DICT_ITEM_INIT(SPA_KEY_PORT_NAME, "control");
items[n_items++] = SPA_DICT_ITEM_INIT(SPA_KEY_FORMAT_DSP, "8 bit raw midi");
control_port->info.props = &SPA_DICT_INIT(items, n_items);
emit_port_info(this, control_port, true);
@ -916,9 +936,6 @@ static int channelmix_process_control(struct impl *this, struct port *ctrlport,
float **d = (float **)dst;
SPA_POD_SEQUENCE_FOREACH(ctrlport->ctrl, c) {
switch (c->type) {
case SPA_CONTROL_Properties:
{
uint32_t chunk;
if (avail_samples == 0)
@ -929,9 +946,23 @@ static int channelmix_process_control(struct impl *this, struct port *ctrlport,
prev = c;
continue;
}
switch (c->type) {
case SPA_CONTROL_Midi:
{
if (prev)
apply_midi(this, &prev->value);
break;
}
case SPA_CONTROL_Properties:
{
if (prev)
apply_props(this, &prev->value);
prev = c;
break;
}
default:
continue;
}
chunk = SPA_MIN(avail_samples, c->offset - ctrlport->ctrl_offset);
@ -946,11 +977,8 @@ static int channelmix_process_control(struct impl *this, struct port *ctrlport,
avail_samples -= chunk;
ctrlport->ctrl_offset += chunk;
break;
}
default:
break;
}
prev = c;
}
/* when we get here we run out of control points but still have some