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CaptureSession.h
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28 
29 /**
30  * @file
31  * <b>Libargus API: Capture Session API</b>
32  *
33  * @b Description: Defines the CaptureSession object and interface.
34  */
35 
36 #ifndef _ARGUS_CAPTURE_SESSION_H
37 #define _ARGUS_CAPTURE_SESSION_H
38 
39 namespace Argus
40 {
41 
42 /**
43  * Object that controls all operations on a single sensor.
44  *
45  * A capture session is bound to a single sensor (or, in future, a group of synchronized sensors)
46  * and provides methods to perform captures on that sensor (via the ICaptureSession interface).
47  *
48  * @defgroup ArgusCaptureSession CaptureSession
49  * @ingroup ArgusObjects
50  */
52 {
53 protected:
55 };
56 
57 /**
58  * @class ICaptureSession
59  *
60  * Interface to the core CaptureSession methods.
61  *
62  * @ingroup ArgusCaptureSession
63  */
64 DEFINE_UUID(InterfaceID, IID_CAPTURE_SESSION, 813644f5,bc21,4013,af44,dd,da,b5,7a,9d,13);
65 class ICaptureSession : public Interface
66 {
67 public:
68  static const InterfaceID& id() { return IID_CAPTURE_SESSION; }
69 
70  /**
71  * Removes all previously submitted requests from the queue. When all requests
72  * are cancelled, both the FIFO and the streaming requests will be removed.
73  * If repeat captures are enabled, an implicit call to ICaptureSession::stopRepeat()
74  * will be made before cancelling the requests.
75  *
76  * @returns success/status of this call.
77  */
78  virtual Status cancelRequests() = 0;
79 
80  /**
81  * Submits a single capture request to the request queue.
82  * The runtime will queue a copy of the request. The client can
83  * submit the same request instance in a future call.
84  * The request will be copied by the runtime.
85  *
86  * @param[in] request Parameters for the capture.
87  * @param[in] timeout The timeout in nanoseconds. The camera device will
88  * try to issue the request within the timeout period. If it can't it
89  * will return and set @c status to STATUS_UNAVAILABLE.
90  * @param[out] status An optional pointer to return success/status.
91  *
92  * @returns the capture id, a number that uniquely identifies (within this session) the request.
93  * If the submission request failed, zero will be returned.
94  * The request could fail because the timeout is reached,
95  * or because some parameter(s) of the @c request are invalid.
96  */
97  virtual uint32_t capture(const Request* request,
98  uint64_t timeout = TIMEOUT_INFINITE,
99  Status* status = NULL) = 0;
100 
101  /**
102  * Submits a burst to the request queue.
103  * The runtime will queue a copy of the burst.
104  * The runtime will either accept the entire burst or refuse it completely
105  * (that is, no partial bursts will be accepted).
106  *
107  * @param[in] requestList The list of requests that make up the burst.
108  * @param[in] timeout The timeout in nanoseconds. The camera device will try to issue
109  * the request within the timeout period. If it can't it will return and set
110  * @c status to STATUS_UNAVAILABLE.
111  * @param[out] status An optional pointer to return success/status.
112  *
113  * @returns the capture id of the capture associated with the first request in the burst.
114  * The capture id will increment by one for the captures associated with each successive
115  * request.
116  * If the submission request failed, zero will be returned.
117  * The request could fail because the timeout is reached,
118  * or because some parameter(s) of the @c request are invalid.
119  */
120  virtual uint32_t captureBurst(const std::vector<const Request*>& requestList,
121  uint64_t timeout = TIMEOUT_INFINITE,
122  Status* status = NULL) = 0;
123 
124  /**
125  * Returns the maximum number of capture requests that can be included in a burst capture.
126  */
127  virtual uint32_t maxBurstRequests() const = 0;
128 
129  /**
130  * Creates a request object that can be later used with this CaptureSession.
131  *
132  * @param[in] intent Optional parameter that specifies the intent of the capture request and
133  * instructs the driver to populate the request with recommended settings
134  * for that intent.
135  * @param[out] status An optional pointer to return success/status.
136  *
137  * @see ICaptureMetadata::getClientData()
138  */
139  virtual Request* createRequest(const CaptureIntent& intent = CAPTURE_INTENT_PREVIEW,
140  Status* status = NULL) = 0;
141 
142  /**
143  * Creates an OutputStreamSettings object, which is used to configure the settings
144  * for OutputStream creation via createOutputStream.
145  *
146  * @param[out] status An optional pointer to return success/status.
147  *
148  * @returns The newly created OutputStream, or NULL on failure.
149  */
150  virtual OutputStreamSettings* createOutputStreamSettings(Status* status = NULL) = 0;
151 
152  /**
153  * Creates an OutputStream object. All OutputStream objects are associated with
154  * and EGLStream, which is created and owned by this object and left in the CREATED
155  * state upon return. This does not connect as a producer for this EGLStream until
156  * the first request outputting to the stream; thus, the application is expected to
157  * connect the consumer to this stream before the first request is made otherwise the
158  * request will fail.
159  *
160  * @param[in] settings The settings to use for the new output stream.
161  * @param[out] status An optional pointer to return success/status.
162  *
163  * @returns The newly created OutputStream, or NULL on failure.
164  */
165  virtual OutputStream* createOutputStream(const OutputStreamSettings* settings,
166  Status* status = NULL) = 0;
167 
168  /**
169  * Returns true if there is a streaming request in place.
170  */
171  virtual bool isRepeating() const = 0;
172 
173  /**
174  * Sets up a repeating request. This is a convenience method that will queue
175  * a request whenever the request queue is empty and the camera is ready to
176  * accept new requests.
177  *
178  * To stop repeating the request, call stopRepeat().
179  *
180  * @param[in] request The request to repeat.
181  *
182  * @returns success/status of the call.
183  */
184  virtual Status repeat(const Request* request) = 0;
185 
186  /**
187  * Sets up a repeating burst request. This is a convenience method that will queue
188  * a request whenever the request queue is empty and the camera is ready to
189  * accept new requests.
190  *
191  * To stop repeating the requests, call stopRepeat().
192  *
193  * @param[in] requestList The list of requests that make up the repeating burst.
194  *
195  * @returns success/status of the call.
196  */
197  virtual Status repeatBurst(const std::vector<const Request*>& requestList) = 0;
198 
199  /**
200  * Shuts down any repeating capture.
201  *
202  * @returns The range of capture ids generated by the most recent repeat() / repeatBurst() call.
203  * Note that some captures within that range may have been generated by explicit capture() calls
204  * made while the repeating capture was in force.
205  * If no captures were generated by the most recent repeat() / repeatBurst() call,
206  * <tt>Range<uint32_t>(0,0)</tt> will be returned.
207  */
208  virtual Range<uint32_t> stopRepeat() = 0;
209 
210  /**
211  * Waits until all pending captures are complete.
212  *
213  * @param[in] timeout The timeout value (in nanoseconds) for this call.
214  * If the pipe has not become idle when the timeout expires,
215  * the call will return STATUS_TIMEOUT.
216  */
217  virtual Status waitForIdle(uint64_t timeout = TIMEOUT_INFINITE) const = 0;
218 
219 protected:
221 };
222 
223 } // namespace Argus
224 
225 #endif // _ARGUS_CAPTURE_SESSION_H