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90 <h1>Android Platform Development Kit</h1>
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174
175<a name="androidCameraTitle"></a><h1>Camera Subsystem</h1>
176
177
178
179<a name="toc"/>
180<div style="padding:10px">
181<a href="#androidCameraIntroduction">Introduction</a><br/>
182<a href="#androidCameraBuildingDriver">Building a Camera Library</a><br/>
183<a href="#androidCameraSequenceDiagrams">Sequence Diagrams</a><br/><div style="padding-left:40px">
184
185<a href="#androidCameraSequenceDiagramsPreview">Preview</a><br/>
186<a href="#androidCameraSequenceDiagramsTakePic">Taking a Picture</a><br/></div>
187<a href="#androidCameraInterfaceIntro">Interface</a><br/></div></font></div>
188
189<a name="androidCameraIntroduction"></a><h2>Introduction</h2>
190
191<p>Android's camera subsystem connects the camera application to the application framework and user space libraries, which in turn communicate with the camera hardware layer that operates the physical camera.</p>
192<p>The diagram below illustrates the structure of the camera subsystem.</p>
193<p><img src="androidCameraArchitecture.gif"></p>
194
195
196<a name="androidCameraBuildingDriver"></a><h2>Building a Camera Library</h2>
197
198<p>To implement a camera driver, create a shared library that implements the interface defined in <code>CameraHardwareInterface.h</code>. You must name your shared library <code>libcamera.so</code> so that it will get loaded from <code>/system/lib</code> at runtime. Place libcamera sources and <code>Android.mk</code> in <code>partner/acme/chipset_or_board/libcamera/</code>.</p>
199<p>The following stub <code>Android.mk</code> file ensures that <code>libcamera</code> compiles and links to the appropriate libraries:</p>
200<pre class="prettify">
201LOCAL_PATH := $(call my-dir)
202include $(CLEAR_VARS)
203
204LOCAL_MODULE := libcamera
205
206LOCAL_SHARED_LIBRARIES := \
207 libutils \
208 librpc \
209 liblog
210
211LOCAL_SRC_FILES += MyCameraHardware.cpp
212
213LOCAL_CFLAGS +=
214
215LOCAL_C_INCLUDES +=
216
217LOCAL_STATIC_LIBRARIES += \
218 libcamera-common \
219 libclock-rpc \
220 libcommondefs-rpc
221
222include $(BUILD_SHARED_LIBRARY)
223</pre>
224
225
226<a name="androidCameraSequenceDiagrams"></a><h2>Sequence Diagrams</h2>
227
228
229
230<a name="androidCameraSequenceDiagramsPreview"></a><h3>Preview</h3>
231
232<p>The following diagram illustrates the sequence of function calls and actions necessary for your camera to preview.</p>
233<img src="cameraPreview.jpg">
234
235
236<a name="androidCameraSequenceDiagramsTakePic"></a><h3>Taking a Picture</h3>
237
238<p>The following diagram illustrates the sequence of function calls and actions necessary for your camera to take a picture.</p>
239<img src="cameraTakePicture.jpg">
240
241
242<a name="androidCameraInterfaceIntro"></a><h2>Interface</h2>
243
244
245
246<p class="note"><strong>Note</strong>: This document relies on some Doxygen-generated content that appears in an iFrame below. To return to the Doxygen default content for this page, <a href="camera.html">click here</a>.</p>
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