wip midi

config/forge.cfg

@@ -38,3 +38,6 @@ SUB_3_PREFIX=mix_
 SUB_VARIANT_COUNT=16
 
 MIDI_HW=hw:CARD=nanoKONTROL2
+
+SELECT_PAGE_COUNT=3
+SELECT_PAGE1=

src/forge.c

@@ -8,6 +8,7 @@
 #include "config_file.h"
 #include "file.h"
 #include "forge.h"
+#include "midi.h"
 #include "rand.h"
 #include "shaders.h"
 #include "shared.h"
@@ -25,6 +26,7 @@ static File *fragment_shaders;
 static File common_shader_code;
 static Timer timer;
 static ConfigFile config;
+static MidiDevice midi;
 
 static void compute_fps() {
   double fps;
@@ -251,6 +253,16 @@ void forge_run(Parameters params) {
 
   init_inputs(params.video_in, params.video_in_count, params.video_size);
 
+  start_video_captures(params.video_in_count);
+
+  midi = midi_open(config_file_get_str(config, "MIDI_HW", "hw"));
+
+  if (midi.error) {
+    params.demo = true;
+  } else {
+    midi_background_listen(midi, context);
+  }
+
   window_startup(error_callback);
 
   context->internal_height = params.internal_size;
@@ -290,8 +302,6 @@ void forge_run(Parameters params) {
 
   timer = timer_init(30);
 
-  start_video_captures(params.video_in_count);
-
   log_info("Initialized");
 
   while ((window_output == NULL || !window_should_close(window_output)) &&
@@ -319,6 +329,8 @@ void forge_run(Parameters params) {
 
   free_video_captures(params.video_in_count);
 
+  midi_close(midi);
+
   free_context();
 
   free_files(frag_count);

src/midi.c

@@ -16,10 +16,11 @@ void midi_close(MidiDevice device) {
 MidiDevice midi_open(char *name) {
   MidiDevice device;
 
+  device.name = name;
   device.input = NULL;
   device.output = NULL;
 
-  snd_rawmidi_open(&device.input, &device.output, name, 0);
+  snd_rawmidi_open(&device.input, &device.output, name, SND_RAWMIDI_NONBLOCK);
 
   device.error = device.input == NULL || device.output == NULL;
 
@@ -32,5 +33,31 @@ MidiDevice midi_open(char *name) {
   return device;
 }
 
+void midi_background_listen(MidiDevice device, SharedContext *context) {
+  pid_t pid;
+  int bytes_read;
+  unsigned char buffer[3];
+
+  pid = fork();
+  if (pid < 0) {
+    log_error("Could not create subprocess");
+    return;
+  }
+  if (pid == 0) {
+    return;
+  }
+  log_info("(%s) background acquisition started (pid: %d)", device.name, pid);
+
+  while (!context->stop) {
+    bytes_read = snd_rawmidi_read(device.input, buffer, 3);
+    if (bytes_read == 3) {
+      log_debug("midi: %d %.2f", buffer[1], (float)buffer[2] / 256);
+    }
+  }
+
+  log_info("(%s) background acquisition stopped by main thread (pid: %d)",
+           device.name, pid);
+}
+
 // int bytes_read = snd_rawmidi_read(input, input_buffer, sizeof(input_buffer));
 // snd_rawmidi_write(output, buffer, 3);

src/midi.h

@@ -5,5 +5,6 @@
 
 MidiDevice midi_open(char *name);
 void midi_close(MidiDevice device);
+void midi_background_listen(MidiDevice device, SharedContext *context);
 
 #endif /* MIDI_H */

src/types.h

@@ -153,6 +153,7 @@ typedef struct ConfigFileItem {
 
 typedef struct MidiDevice {
   bool error;
+  char *name;
   snd_rawmidi_t *input;
   snd_rawmidi_t *output;
 } MidiDevice;

src/video.c

@@ -341,7 +341,7 @@ void video_background_read(VideoCapture *video_capture, SharedContext *context,
   if (pid == 0) {
     return;
   }
-  log_info("%s background acquisition started (pid: %d)", video_capture->name,
+  log_info("(%s) background acquisition started (pid: %d)", video_capture->name,
            pid);
   timer = timer_init(30);
 
@@ -355,13 +355,12 @@ void video_background_read(VideoCapture *video_capture, SharedContext *context,
     }
   }
   if (context->stop) {
-    log_info("%s background acquisition stopped by main thread (pid: %d)",
+    log_info("(%s) background acquisition stopped by main thread (pid: %d)",
              video_capture->name, pid);
   } else {
-    log_info("%s background acquisition stopped after error (pid: %d)",
+    log_info("(%s) background acquisition stopped after error (pid: %d)",
              video_capture->name, pid);
   }
-  window_terminate();
   exit(context->stop ? EXIT_SUCCESS : EXIT_FAILURE);
 }