video: add video format

start working on v4l2 source

spa/plugins/v4l2/v4l2-utils.c

@@ -0,0 +1,82 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sched.h>
+#include <errno.h>
+#include <getopt.h>
+#include <sys/time.h>
+#include <math.h>
+
+#define CHECK(s,msg) if ((err = (s)) < 0) { printf (msg ": %s\n", snd_strerror(err)); return err; }
+
+
+static int
+spa_v4l2_open (SpaV4l2Source *this)
+{
+  struct stat st;
+
+  fprintf (stderr, "Playback device is '%s'\n", this->props.device);
+
+  if (stat (this->props.device, &st) < 0) {
+    fprintf(stderr, "Cannot identify '%s': %d, %s\n",
+            this->props.device, errno, strerror (errno));
+    return -1;
+  }
+
+  if (!S_ISCHR (st.st_mode)) {
+    fprintf(stderr, "%s is no device\n", this->props.device);
+    return -1;
+  }
+
+  this->state.fd = open (this->props.device, O_RDWR | O_NONBLOCK, 0);
+
+  if (this->state.fd == -1) {
+    fprintf(stderr, "Cannot open '%s': %d, %s\n",
+            this->props.device, errno, strerror (errno));
+    return -1;
+  }
+  return 0;
+}
+
+static int
+spa_v4l2_close (SpaV4l2Source *this)
+{
+  if (close(this->state.fd))
+    fprintf(stderr, "Cannot close %d, %s\n",
+            errno, strerror (errno));
+
+  this->state.fd = -1;
+  return 0;
+}
+
+static void *
+v4l2_loop (void *user_data)
+{
+  return NULL;
+}
+
+static int
+spa_v4l2_start (SpaV4l2Source *this)
+{
+  SpaV4l2State *state = &this->state;
+  int err;
+
+  state->running = true;
+  if ((err = pthread_create (&state->thread, NULL, v4l2_loop, this)) != 0) {
+    printf ("can't create thread: %d", err);
+    state->running = false;
+  }
+  return err;
+}
+
+static int
+spa_v4l2_stop (SpaV4l2Source *this)
+{
+  SpaV4l2State *state = &this->state;
+
+  if (state->running) {
+    state->running = false;
+    pthread_join (state->thread, NULL);
+  }
+  return 0;
+}