2 files changed, 53 insertions, 0 deletions
diff --git a/src/android/mm/generic_camera_buffer.cpp b/src/android/mm/generic_camera_buffer.cpp
new file mode 100644
index 00000000..bd9152cf
--- /dev/null
+++ b/src/android/mm/generic_camera_buffer.cpp
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2021, Google Inc.
+ *
+ * generic_camera_buffer.cpp - Generic Android frame buffer backend
+ */
+
+#include "../camera_buffer.h"
+
+#include "libcamera/internal/log.h"
+
+using namespace libcamera;
+
+LOG_DECLARE_CATEGORY(HAL)
+
+CameraBuffer::CameraBuffer(const buffer_handle_t camera3buffer, int flags)
+{
+	maps_.reserve(camera3buffer->numFds);
+	error_ = 0;
+
+	for (int i = 0; i < camera3buffer->numFds; i++) {
+		if (camera3buffer->data[i] == -1)
+			continue;
+
+		off_t length = lseek(camera3buffer->data[i], 0, SEEK_END);
+		if (length < 0) {
+			error_ = -errno;
+			LOG(HAL, Error) << "Failed to query plane length";
+			break;
+		}
+
+		void *address = mmap(nullptr, length, flags, MAP_SHARED,
+				     camera3buffer->data[i], 0);
+		if (address == MAP_FAILED) {
+			error_ = -errno;
+			LOG(HAL, Error) << "Failed to mmap plane";
+			break;
+		}
+
+		maps_.emplace_back(static_cast<uint8_t *>(address),
+				   static_cast<size_t>(length));
+	}
+}
+
+CameraBuffer::~CameraBuffer()
+{
+}
diff --git a/src/android/mm/meson.build b/src/android/mm/meson.build
new file mode 100644
index 00000000..97f83f2a
--- /dev/null
+++ b/src/android/mm/meson.build
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: CC0-1.0
+
+platform = get_option('android_platform')
+if platform == 'generic'
+    android_hal_sources += files(['generic_camera_buffer.cpp'])
+endif