Improve const correctness.

3 files changed, 24 insertions, 25 deletions

diff --git a/plugins/eg-amp.lv2/amp.c b/plugins/eg-amp.lv2/amp.c
index 7f7cacc..86f7a81 100644
--- a/plugins/eg-amp.lv2/amp.c
+++ b/plugins/eg-amp.lv2/amp.c
@@ -41,9 +41,9 @@ typedef enum {
 /** Plugin instance. */
 typedef struct {
 	// Port buffers
-	float* gain;
-	float* input;
-	float* output;
+	const float* gain;
+	const float* input;
+	float*       output;
 } Amp;
 
 /** Create a new plugin instance. */
@@ -68,10 +68,10 @@ connect_port(LV2_Handle instance,
 
 	switch ((PortIndex)port) {
 	case AMP_GAIN:
-		amp->gain = (float*)data;
+		amp->gain = (const float*)data;
 		break;
 	case AMP_INPUT:
-		amp->input = (float*)data;
+		amp->input = (const float*)data;
 		break;
 	case AMP_OUTPUT:
 		amp->output = (float*)data;
@@ -92,7 +92,7 @@ activate(LV2_Handle instance)
 static void
 run(LV2_Handle instance, uint32_t n_samples)
 {
-	Amp* amp = (Amp*)instance;
+	const Amp* amp = (const Amp*)instance;
 
 	const float        gain   = *(amp->gain);
 	const float* const input  = amp->input;
diff --git a/plugins/eg-sampler.lv2/sampler.c b/plugins/eg-sampler.lv2/sampler.c
index a94518b..3415dcb 100644
--- a/plugins/eg-sampler.lv2/sampler.c
+++ b/plugins/eg-sampler.lv2/sampler.c
@@ -51,9 +51,9 @@
 #include "./uris.h"
 
 enum {
-	SAMPLER_CONTROL  = 0,
-	SAMPLER_RESPONSE = 1,
-	SAMPLER_OUT      = 2
+	SAMPLER_CONTROL = 0,
+	SAMPLER_NOTIFY  = 1,
+	SAMPLER_OUT     = 2
 };
 
 static const char* default_sample_file = "click.wav";
@@ -78,9 +78,9 @@ typedef struct {
 	Sample* sample;
 
 	/* Ports */
-	float*               output_port;
-	LV2_Atom_Sequence*   control_port;
-	LV2_Atom_Sequence*   notify_port;
+	const LV2_Atom_Sequence* control_port;
+	LV2_Atom_Sequence*       notify_port;
+	float*                   output_port;
 
 	/* Forge frame for notify port (for writing worker replies). */
 	LV2_Atom_Forge_Frame notify_frame;
@@ -201,7 +201,7 @@ work(LV2_Handle                  instance,
 	const LV2_Atom* atom = (const LV2_Atom*)data;
 	if (atom->type == self->uris.eg_freeSample) {
 		/* Free old sample */
-		SampleMessage* msg = (SampleMessage*)data;
+		const SampleMessage* msg = (const SampleMessage*)data;
 		free_sample(self, msg->sample);
 	} else {
 		/* Handle set message (load sample). */
@@ -214,7 +214,7 @@ work(LV2_Handle                  instance,
 		}
 
 		/* Load sample. */
-		Sample* sample = load_sample(self, LV2_ATOM_BODY(file_path));
+		Sample* sample = load_sample(self, LV2_ATOM_BODY_CONST(file_path));
 		if (sample) {
 			/* Loaded sample, send it to run() to be applied. */
 			respond(handle, sizeof(sample), &sample);
@@ -245,7 +245,7 @@ work_response(LV2_Handle  instance,
 	self->schedule->schedule_work(self->schedule->handle, sizeof(msg), &msg);
 
 	/* Install the new sample */
-	self->sample = *(Sample**)data;
+	self->sample = *(Sample*const*)data;
 
 	/* Send a notification that we're using a new sample. */
 	lv2_atom_forge_frame_time(&self->forge, self->frame_offset);
@@ -264,9 +264,9 @@ connect_port(LV2_Handle instance,
 	Sampler* self = (Sampler*)instance;
 	switch (port) {
 	case SAMPLER_CONTROL:
-		self->control_port = (LV2_Atom_Sequence*)data;
+		self->control_port = (const LV2_Atom_Sequence*)data;
 		break;
-	case SAMPLER_RESPONSE:
+	case SAMPLER_NOTIFY:
 		self->notify_port = (LV2_Atom_Sequence*)data;
 		break;
 	case SAMPLER_OUT:
diff --git a/plugins/eg-synth.lv2/synth.c b/plugins/eg-synth.lv2/synth.c
index d969057..758989b 100644
--- a/plugins/eg-synth.lv2/synth.c
+++ b/plugins/eg-synth.lv2/synth.c
@@ -45,9 +45,8 @@ typedef struct {
 	float phase;
 
 	// Port buffers
-	float* freq;
-	float* input;
-	float* output;
+	const float* freq;
+	float*       output;
 } Synth;
 
 /** Create a new plugin instance. */
@@ -58,10 +57,10 @@ instantiate(const LV2_Descriptor*     descriptor,
             const LV2_Feature* const* features)
 {
 	Synth* self = (Synth*)malloc(sizeof(Synth));
-
-	// Store the sample rate so it is available in run()
-	self->sample_rate = rate;
-
+	if (self) {
+		// Store the sample rate so it is available in run()
+		self->sample_rate = rate;
+	}
 	return (LV2_Handle)self;
 }
 
@@ -75,7 +74,7 @@ connect_port(LV2_Handle instance,
 
 	switch ((PortIndex)port) {
 	case SYNTH_FREQ:
-		self->freq = (float*)data;
+		self->freq = (const float*)data;
 		break;
 	case SYNTH_OUTPUT:
 		self->output = (float*)data;