Move device/hw/buffer.c to device/buffer.c

device/buffer.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <stddef.h>
+#include <linux/videodev2.h>
+
+typedef struct buffer_s buffer_t;
+typedef struct buffer_list_s buffer_list_t;
+
+typedef struct buffer_s {
+  char *name;
+  struct buffer_list_s *buf_list;
+  int index;
+
+  // Mapped memory (with DMA)
+  void *start;
+  size_t used;
+  size_t length;
+  int dma_fd;
+
+  struct {
+    unsigned flags;
+  } v4l2;
+
+  // State
+  int mmap_reflinks;
+  buffer_t *dma_source;
+  bool enqueued;
+  uint64_t enqueue_time_us, captured_time_us;
+} buffer_t;
+
+buffer_t *buffer_open(const char *name, buffer_list_t *buf_list, int buffer);
+void buffer_close(buffer_t *buf);
+
+bool buffer_use(buffer_t *buf);
+bool buffer_consumed(buffer_t *buf, const char *who);