add circuitpython code

1 files changed, 104 insertions, 0 deletions

diff --git a/circuitpython/lib/quirc/demo/camera.h b/circuitpython/lib/quirc/demo/camera.h
new file mode 100644
index 0000000..511b5bd
--- /dev/null
+++ b/circuitpython/lib/quirc/demo/camera.h
@@ -0,0 +1,104 @@
+/* quirc -- QR-code recognition library
+ * Copyright (C) 2010-2014 Daniel Beer <dlbeer@gmail.com>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef CAMERA_H_
+#define CAMERA_H_
+
+#include <stddef.h>
+
+#define CAMERA_MAX_BUFFERS	32
+
+typedef enum {
+	CAMERA_FORMAT_UNKNOWN = 0,
+	CAMERA_FORMAT_MJPEG,
+	CAMERA_FORMAT_YUYV
+} camera_format_t;
+
+struct camera_parms {
+	camera_format_t		format;
+	int			width;
+	int			height;
+	int			pitch_bytes;
+	int			interval_n;
+	int			interval_d;
+};
+
+struct camera_buffer {
+	void			*addr;
+	size_t			size;
+	unsigned long		offset;
+};
+
+struct camera {
+	int			fd;
+
+	struct camera_parms	parms;
+
+	struct camera_buffer	buf_desc[CAMERA_MAX_BUFFERS];
+	int			buf_count;
+
+	/* Stream state */
+	int			s_on;
+	int			s_qc;
+	int			s_qhead;
+};
+
+/* Initialize/destroy a camera. No resources are allocated. */
+void camera_init(struct camera *c);
+void camera_destroy(struct camera *c);
+
+/* Open/close the camera device */
+int camera_open(struct camera *c, const char *path,
+		int target_w, int target_h,
+		int tr_n, int tr_d);
+void camera_close(struct camera *c);
+
+static inline int camera_get_fd(const struct camera *c)
+{
+	return c->fd;
+}
+
+static inline const struct camera_parms *camera_get_parms
+	(const struct camera *c)
+{
+	return &c->parms;
+}
+
+/* Map buffers */
+int camera_map(struct camera *c, int buf_count);
+void camera_unmap(struct camera *c);
+
+static inline int camera_get_buf_count(const struct camera *c)
+{
+	return c->buf_count;
+}
+
+/* Switch streaming on/off */
+int camera_on(struct camera *c);
+void camera_off(struct camera *c);
+
+/* Enqueue/dequeue buffers (count = 0 means enqueue all) */
+int camera_enqueue_all(struct camera *c);
+int camera_dequeue_one(struct camera *c);
+
+/* Fetch the oldest dequeued buffer */
+static inline const struct camera_buffer *camera_get_head
+	(const struct camera *c)
+{
+	return &c->buf_desc[(c->s_qhead + c->buf_count - 1) % c->buf_count];
+}
+
+#endif