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      1 /*
      2  * Copyright (C) 2014 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef ANDROID_SERVERS_CAMERA3_DUMMY_STREAM_H
     18 #define ANDROID_SERVERS_CAMERA3_DUMMY_STREAM_H
     19 
     20 #include <utils/RefBase.h>
     21 #include <gui/Surface.h>
     22 
     23 #include "Camera3Stream.h"
     24 #include "Camera3IOStreamBase.h"
     25 #include "Camera3OutputStreamInterface.h"
     26 
     27 namespace android {
     28 namespace camera3 {
     29 
     30 /**
     31  * A dummy output stream class, to be used as a placeholder when no valid
     32  * streams are configured by the client.
     33  * This is necessary because camera HAL v3.2 or older disallow configuring
     34  * 0 output streams, while the public camera2 API allows for it.
     35  */
     36 class Camera3DummyStream :
     37         public Camera3IOStreamBase,
     38         public Camera3OutputStreamInterface {
     39 
     40   public:
     41     /**
     42      * Set up a dummy stream; doesn't actually connect to anything, and uses
     43      * a default dummy format and size.
     44      */
     45     explicit Camera3DummyStream(int id);
     46 
     47     virtual ~Camera3DummyStream();
     48 
     49     /**
     50      * Camera3Stream interface
     51      */
     52 
     53     virtual void     dump(int fd, const Vector<String16> &args) const;
     54 
     55     status_t         setTransform(int transform);
     56 
     57     virtual status_t detachBuffer(sp<GraphicBuffer>* buffer, int* fenceFd);
     58 
     59     /**
     60      * Return if this output stream is for video encoding.
     61      */
     62     bool isVideoStream() const;
     63 
     64     /**
     65      * Return if the consumer configuration of this stream is deferred.
     66      */
     67     virtual bool isConsumerConfigurationDeferred(size_t surface_id) const;
     68 
     69     /**
     70      * Set the consumer surfaces to the output stream.
     71      */
     72     virtual status_t setConsumers(const std::vector<sp<Surface>>& consumers);
     73 
     74   protected:
     75 
     76     /**
     77      * Note that we release the lock briefly in this function
     78      */
     79     virtual status_t returnBufferCheckedLocked(
     80             const camera3_stream_buffer &buffer,
     81             nsecs_t timestamp,
     82             bool output,
     83             /*out*/
     84             sp<Fence> *releaseFenceOut);
     85 
     86     virtual status_t disconnectLocked();
     87 
     88   private:
     89 
     90     // Default dummy parameters; 320x240 is a required size for all devices,
     91     // otherwise act like a SurfaceView would.
     92     static const int DUMMY_WIDTH = 320;
     93     static const int DUMMY_HEIGHT = 240;
     94     static const int DUMMY_FORMAT = HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED;
     95     static const android_dataspace DUMMY_DATASPACE = HAL_DATASPACE_UNKNOWN;
     96     static const camera3_stream_rotation_t DUMMY_ROTATION = CAMERA3_STREAM_ROTATION_0;
     97     static const uint32_t DUMMY_USAGE = GRALLOC_USAGE_HW_COMPOSER;
     98 
     99     /**
    100      * Internal Camera3Stream interface
    101      */
    102     virtual status_t getBufferLocked(camera3_stream_buffer *buffer,
    103             const std::vector<size_t>& surface_ids = std::vector<size_t>());
    104     virtual status_t returnBufferLocked(
    105             const camera3_stream_buffer &buffer,
    106             nsecs_t timestamp);
    107 
    108     virtual status_t configureQueueLocked();
    109 
    110     virtual status_t getEndpointUsage(uint32_t *usage) const;
    111 
    112 }; // class Camera3DummyStream
    113 
    114 } // namespace camera3
    115 
    116 } // namespace android
    117 
    118 #endif
    119