From cfcee4cfe70536faeb9f2aaa87257d067e902b70 Mon Sep 17 00:00:00 2001
From: Lionel CHAZALLON <LongChair@hotmail.com>
Date: Mon, 23 Oct 2017 08:51:49 -0700
Subject: Add DRM_PRIME Format Handling and Display for RockChip MPP decoders

This commit allows to use the AV_PIX_FMT_DRM_PRIME newly introduced
format in ffmpeg that allows decoders to provide an AVDRMFrameDescriptor
struct.

That struct holds dmabuf fds and information allowing zerocopy rendering
using KMS / DRM Atomic.

This has been tested on RockChip ROCK64 device.
---
 video/out/drm_prime.c | 85 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 video/out/drm_prime.c

(limited to 'video/out/drm_prime.c')

diff --git a/video/out/drm_prime.c b/video/out/drm_prime.c
new file mode 100644
index 0000000000..253fbb6c40
--- /dev/null
+++ b/video/out/drm_prime.c
@@ -0,0 +1,85 @@
+/*
+ * This file is part of mpv.
+ *
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * mpv is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <unistd.h>
+#include <xf86drm.h>
+#include <xf86drmMode.h>
+
+#include "common/msg.h"
+#include "drm_common.h"
+#include "drm_prime.h"
+
+int drm_prime_create_framebuffer(struct mp_log *log, int fd, AVDRMFrameDescriptor *descriptor, int width, int height,
+                                  struct  drm_prime_framebuffer *framebuffer)
+{
+    AVDRMLayerDescriptor *layer = NULL;
+    uint32_t pitches[4], offsets[4], handles[4];
+    int ret, layer_fd;
+
+    if (descriptor && descriptor->nb_layers) {
+        *framebuffer = (struct drm_prime_framebuffer){0};
+
+        for (int object = 0; object < descriptor->nb_objects; object++) {
+            ret = drmPrimeFDToHandle(fd, descriptor->objects[object].fd, &framebuffer->gem_handles[object]);
+            if (ret < 0) {
+                mp_err(log, "Failed to retrieve the Prime Handle from handle %d (%d).\n", object, descriptor->objects[object].fd);
+                goto fail;
+            }
+        }
+
+        layer = &descriptor->layers[0];
+
+        for (int plane = 0; plane < AV_DRM_MAX_PLANES; plane++) {
+            layer_fd = framebuffer->gem_handles[layer->planes[plane].object_index];
+            if (layer_fd && layer->planes[plane].pitch) {
+                pitches[plane] = layer->planes[plane].pitch;
+                offsets[plane] = layer->planes[plane].offset;
+                handles[plane] = layer_fd;
+            } else {
+                pitches[plane] = 0;
+                offsets[plane] = 0;
+                handles[plane] = 0;
+            }
+        }
+
+        ret = drmModeAddFB2(fd, width, height, layer->format,
+                            handles, pitches, offsets, &framebuffer->fb_id, 0);
+        if (ret < 0) {
+            mp_err(log, "Failed to create framebuffer on layer %d.\n", 0);
+            goto fail;
+        }
+    }
+
+   return 0;
+
+fail:
+   memset(framebuffer, 0, sizeof(*framebuffer));
+   return -1;
+}
+
+void drm_prime_destroy_framebuffer(struct mp_log *log, int fd, struct  drm_prime_framebuffer *framebuffer)
+{
+    if (framebuffer->fb_id)
+        drmModeRmFB(fd, framebuffer->fb_id);
+
+    for (int i = 0; i < AV_DRM_MAX_PLANES; i++) {
+        if (framebuffer->gem_handles[i])
+            drmIoctl(fd, DRM_IOCTL_GEM_CLOSE, &framebuffer->gem_handles[i]);
+    }
+
+    memset(framebuffer, 0, sizeof(*framebuffer));
+}
-- 
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