Introduce and use media helpers, updated to the latest media request API

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>

src/media.c

@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2018 Paul Kocialkowski <paul.kocialkowski@bootlin.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdlib.h>
+#include <sys/select.h>
+
+#include <linux/media.h>
+
+#include "sunxi_cedrus.h"
+#include "v4l2.h"
+
+int media_request_alloc(int media_fd)
+{
+	int rc;
+
+	rc = ioctl(media_fd, MEDIA_IOC_REQUEST_ALLOC, &request_alloc);
+	if (rc < 0) {
+		sunxi_cedrus_msg("Unable to allocate media request: %s\n", strerror(errno));
+		return -1;
+	}
+
+	return request_alloc.fd;
+}
+
+int media_request_reinit(int request_fd)
+{
+	int rc;
+
+	rc = ioctl(request_fd, MEDIA_REQUEST_IOC_REINIT, NULL);
+	if (rc < 0) {
+		sunxi_cedrus_msg("Unable to reinit media request: %s\n", strerror(errno));
+		return -1;
+	}
+
+	return 0;
+}
+
+int media_request_queue(int request_fd)
+{
+	int rc;
+
+	rc = ioctl(request_fd, MEDIA_REQUEST_IOC_QUEUE, NULL);
+	if (rc < 0) {
+		sunxi_cedrus_msg("Unable to queue media request: %s\n", strerror(errno));
+		return -1;
+	}
+
+	return 0;
+}
+
+int media_request_wait_completion(int request_fd)
+{
+	struct timeval tv = { 0, 300000 };
+        fd_set except_fds;
+
+	FD_ZERO(&except_fds);
+	FD_SET(request_fd, &except_fds);
+
+	rc = select(request_fd + 1, NULL, NULL, &except_fds, &tv);
+	if (rc == 0) {
+		sunxi_cedrus_msg("Timeout when waiting for media request\n");
+		return -1;
+	} else if (rc < 0) {
+		sunxi_cedrus_msg("Unable to select media request: %s\n", strerror(errno));
+		return -1;
+	}
+
+	return 0;
+}