Implement kms vaapi capture

include/kms/kms_client.h

@@ -0,0 +1,21 @@
+#ifndef GSR_KMS_CLIENT_H
+#define GSR_KMS_CLIENT_H
+
+#include "kms_shared.h"
+#include <sys/types.h>
+
+typedef struct {
+    pid_t kms_server_pid;
+    int socket_fd;
+    int client_fd;
+    char socket_path[27];
+    char *card_path;
+} gsr_kms_client;
+
+/* |card_path| should be a path to card, for example /dev/dri/card0 */
+int gsr_kms_client_init(gsr_kms_client *self, const char *card_path, const char *program_dir);
+void gsr_kms_client_deinit(gsr_kms_client *self);
+
+int gsr_kms_client_get_kms(gsr_kms_client *self, gsr_kms_response *response);
+
+#endif /* #define GSR_KMS_CLIENT_H */

include/kms/kms_shared.h

@@ -0,0 +1,45 @@
+#ifndef GSR_KMS_SHARED_H
+#define GSR_KMS_SHARED_H
+
+#include <stdint.h>
+
+typedef enum {
+    KMS_REQUEST_TYPE_GET_KMS
+} gsr_kms_request_type;
+
+typedef enum {
+    KMS_RESULT_OK,
+    KMS_RESULT_INVALID_REQUEST,
+    KMS_RESULT_FAILED_TO_OPEN_CARD,
+    KMS_RESULT_INSUFFICIENT_PERMISSIONS,
+    KMS_RESULT_FAILED_TO_GET_KMS,
+    KMS_RESULT_NO_KMS_AVAILABLE,
+    KMS_RESULT_FAILED_TO_SEND
+} gsr_kms_result;
+
+typedef struct {
+    int type; /* gsr_kms_request_type */
+    union {
+        char card_path[255];
+    } data;
+} gsr_kms_request;
+
+typedef struct {
+    int fd;
+    uint32_t width;
+    uint32_t height;
+    uint32_t pitch;
+    uint32_t offset;
+    uint32_t pixel_format;
+    uint64_t modifier;
+} gsr_kms_response_fd;
+
+typedef struct {
+    int result; /* gsr_kms_result */
+    union {
+        char err_msg[128];
+        gsr_kms_response_fd fd;
+    } data;
+} gsr_kms_response;
+
+#endif /* #define GSR_KMS_SHARED_H */