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-rw-r--r--backends/visca.c30
-rw-r--r--backends/visca.md50
2 files changed, 75 insertions, 5 deletions
diff --git a/backends/visca.c b/backends/visca.c
index f8bdae1..ae586a7 100644
--- a/backends/visca.c
+++ b/backends/visca.c
@@ -44,7 +44,7 @@ static int ptz_configure_instance(instance* inst, char* option, char* value){
data->cam_address = strtoul(value, NULL, 10);
return 0;
}
- if(!strcmp(option, "connect")){
+ else if(!strcmp(option, "connect")){
if(data->fd >= 0){
LOGPF("Instance %s already connected", inst->name);
return 1;
@@ -67,6 +67,24 @@ static int ptz_configure_instance(instance* inst, char* option, char* value){
}
return 0;
}
+ else if(!strcmp(option, "device")){
+ if(data->fd >= 0){
+ LOGPF("Instance %s already connected", inst->name);
+ return 1;
+ }
+
+ #ifdef _WIN32
+ LOGPF("Direct device connections are not possible on Windows");
+ return 1;
+ #else
+ data->fd = open(value, O_NONBLOCK);
+ if(data->fd < 0){
+ LOGPF("Failed to connect instance %s to device %s", inst->name, value);
+ return 1;
+ }
+ return 0;
+ #endif
+ }
LOGPF("Unknown instance configuration parameter %s for instance %s", option, inst->name);
return 1;
@@ -109,6 +127,7 @@ static channel* ptz_channel(instance* inst, char* spec, uint8_t flags){
return NULL;
}
+ //store the memory to be called above the command type
if(ident == call){
ident |= (strtoul(spec + strlen(ptz_channels[call].name), NULL, 10) << 8);
}
@@ -118,8 +137,8 @@ static channel* ptz_channel(instance* inst, char* spec, uint8_t flags){
static size_t ptz_set_pantilt(instance* inst, channel* c, channel_value* v, uint8_t* msg){
ptz_instance_data* data = (ptz_instance_data*) inst->impl;
- uint32_t* x = (uint32_t*) msg + 6;
- uint32_t* y = (uint32_t*) msg + 10;
+ uint32_t* x = (uint32_t*) (msg + 6);
+ uint32_t* y = (uint32_t*) (msg + 10);
if(c->ident == pan){
data->x = ((ptz_channels[pan].max - ptz_channels[pan].min) * v->normalised) + ptz_channels[pan].min;
@@ -144,17 +163,18 @@ static size_t ptz_set_ptspeed(instance* inst, channel* c, channel_value* v, uint
else{
data->tiltspeed = ((ptz_channels[tiltspeed].max - ptz_channels[tiltspeed].min) * v->normalised) + ptz_channels[tiltspeed].min;
}
+
return 0;
}
static size_t ptz_set_zoom(instance* inst, channel* c, channel_value* v, uint8_t* msg){
- uint32_t* position = (uint32_t*) msg + 4;
+ uint32_t* position = (uint32_t*) (msg + 4);
*position = htobe32(((ptz_channels[zoom].max - ptz_channels[zoom].min) * v->normalised) + ptz_channels[zoom].min);
return ptz_channels[zoom].bytes;
}
static size_t ptz_set_focus(instance* inst, channel* c, channel_value* v, uint8_t* msg){
- uint32_t* position = (uint32_t*) msg + 4;
+ uint32_t* position = (uint32_t*) (msg + 4);
*position = htobe32(((ptz_channels[focus].max - ptz_channels[focus].min) * v->normalised) + ptz_channels[focus].min);
return ptz_channels[focus].bytes;
}
diff --git a/backends/visca.md b/backends/visca.md
new file mode 100644
index 0000000..26e523a
--- /dev/null
+++ b/backends/visca.md
@@ -0,0 +1,50 @@
+### The `visca` backend
+
+The VISCA backend provides control of compatible PTZ (Pan, Tilt, Zoom) controllable cameras
+via the network. This protocol has, with some variations, been implemented by multiple manufacturers
+in their camera equipment. There may be some specific limits on the command set depending on make
+and model of your equpipment.
+
+This backend can connect to both UDP and TCP based cameras.
+
+#### Global configuration
+
+The `visca` backend does not take any global configuration.
+
+#### Instance configuration
+
+| Option | Example value | Default value | Description |
+|---------------|-----------------------|-----------------------|---------------------------------------------------------------|
+| `id` | `5` | `1` | VISCA Camera address (normally 1 for network communication |
+| `connect` | `10.10.10.1 5678` | none | Camera network address and port. Default connection is TCP, when optionally suffixed with the `udp` keyword, connection will be UDP |
+| `device` | `/dev/ttyUSB0` | none | (Linux only) Device node for a serial port adapter connecting to the camera |
+
+#### Channel specification
+
+Each instance exposes the following channels
+
+* `pan`: Pan axis
+* `tilt`: Tilt axis
+* `panspeed`: Pan speed
+* `tiltspeed`: Tilt speed
+* `zoom`: Zoom position
+* `focus`: Focus position
+* `memory<n>`: Call memory <n> (if incoming event value is greater than 0.9)
+
+Example mappings:
+
+```
+control.pan > visca.pan
+control.tilt > visca.tilt
+control.btn1 > visca.memory1
+```
+
+#### Known bugs / problems
+
+Value readback / Inquiry is not yet implemented. This backend currently only does output.
+
+Some manufacturers use VISCA, but require special framing for command flow control. This may be implemented
+in the future if there is sufficient interest.
+
+Please file a ticket if you can confirm this backend working/nonworking with a new make or model
+of camera so we can add it to the compatability list!