Camera: Add streams to camera3 HAL device

- Generic stream interface
- Functional output stream
- Skeleton input/zsl stream

Change-Id: I143794eac1a2217031d62b51912662fc6d1db900

1 files changed, 79 insertions, 0 deletions

diff --git a/services/camera/libcameraservice/camera3/Camera3ZslStream.h b/services/camera/libcameraservice/camera3/Camera3ZslStream.h
new file mode 100644
index 0000000..39d5995
--- /dev/null
+++ b/services/camera/libcameraservice/camera3/Camera3ZslStream.h
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_SERVERS_CAMERA3_ZSL_STREAM_H
+#define ANDROID_SERVERS_CAMERA3_ZSL_STREAM_H
+
+#include <utils/RefBase.h>
+#include <gui/Surface.h>
+
+#include "Camera3Stream.h"
+
+namespace android {
+
+namespace camera3 {
+
+/**
+ * A class for managing a single opaque ZSL stream to/from the camera device.
+ * This acts as a bidirectional stream at the HAL layer, caching and discarding
+ * most output buffers, and when directed, pushes a buffer back to the HAL for
+ * processing.
+ */
+class Camera3ZslStream: public Camera3Stream {
+  public:
+    /**
+     * Set up a ZSL stream of a given resolution. Depth is the number of buffers
+     * cached within the stream that can be retrieved for input.
+     */
+    Camera3ZslStream(int id, uint32_t width, uint32_t height, int depth);
+
+    virtual status_t waitUntilIdle(nsecs_t timeout);
+    virtual void     dump(int fd, const Vector<String16> &args) const;
+
+    /**
+     * Get an input buffer matching a specific timestamp. If no buffer matching
+     * the timestamp is available, NO_MEMORY is returned.
+     */
+    status_t getInputBuffer(camera3_stream_buffer *buffer, nsecs_t timestamp);
+
+    /**
+     * Return input buffer from HAL. The buffer is then marked as unfilled, and
+     * returned to the output-side stream for refilling.
+     */
+    status_t returnInputBuffer(const camera3_stream_buffer &buffer);
+
+  private:
+
+    int mDepth;
+
+    /**
+     * Camera3Stream interface
+     */
+
+    // getBuffer/returnBuffer operate the output stream side of the ZslStream.
+    virtual status_t getBufferLocked(camera3_stream_buffer *buffer);
+    virtual status_t returnBufferLocked(const camera3_stream_buffer &buffer,
+            nsecs_t timestamp);
+    virtual bool     hasOutstandingBuffersLocked() const;
+    virtual status_t disconnectLocked();
+
+}; // class Camera3ZslStream
+
+}; // namespace camera3
+
+}; // namespace android
+
+#endif