[libcamera-devel] [PATCH v2] android: CameraDevice: factorize reporting a capture result

[Hirokazu Honda]

With this implementation, stop() can be as follows.

$ git diff
diff --git a/src/android/camera_device.cpp b/src/android/camera_device.cpp
index 70174a2b..c5091e4f 100644
--- a/src/android/camera_device.cpp
+++ b/src/android/camera_device.cpp
@@ -773,19 +773,8 @@ void CameraDevice::stop()
                for (auto &[cookie, descriptor] : descriptors_) {
                        LOG(HAL, Debug) << "request is canceled: " << cookie;

-                       camera3_capture_result_t captureResult = {};
-                       captureResult.frame_number = descriptor.frameNumber_;
-                       captureResult.num_output_buffers =
descriptor.buffers_.size();
-                       for (camera3_stream_buffer_t &buffer :
descriptor.buffers_) {
-                               buffer.acquire_fence = -1;
-                               buffer.release_fence = -1;
-                               buffer.status = CAMERA3_BUFFER_STATUS_ERROR;
-                       }
-                       captureResult.output_buffers =
descriptor.buffers_.data();
-
-                       notifyError(descriptor.frameNumber_,
-                                   descriptor.buffers_[0].stream);
-                       callbacks_->process_capture_result(callbacks_,
&captureResult);
+                       reportDescriptor(descriptor,
+                                        CAMERA3_BUFFER_STATUS_ERROR);
                }

                descriptors_.clear();

On Mon, Apr 26, 2021 at 7:57 PM Hirokazu Honda <hiroh at chromium.org> wrote:
>
> This factorizes a code of reporting a capture result including
> notifying either shutter or error. It will be useful to report
> capture results in other places than
> CameraDevice::reqeustComplete().
>
> Signed-off-by: Hirokazu Honda <hiroh at chromium.org>
> ---
>  src/android/camera_device.cpp | 22 +++++++++++++++-------
>  src/android/camera_device.h   |  4 ++++
>  2 files changed, 19 insertions(+), 7 deletions(-)
>
> diff --git a/src/android/camera_device.cpp b/src/android/camera_device.cpp
> index fb89195e..70174a2b 100644
> --- a/src/android/camera_device.cpp
> +++ b/src/android/camera_device.cpp
> @@ -2132,7 +2132,20 @@ void CameraDevice::requestComplete(Request *request)
>                         cameraStream->putBuffer(src);
>         }
>
> -       /* Prepare to call back the Android camera stack. */
> +       reportDescriptor(descriptor, status, timestamp,
> +                        resultMetadata ? resultMetadata->get() : nullptr);
> +}
> +
> +std::string CameraDevice::logPrefix() const
> +{
> +       return "'" + camera_->id() + "'";
> +}
> +
> +void CameraDevice::reportDescriptor(Camera3RequestDescriptor &descriptor,
> +                                   camera3_buffer_status status,
> +                                   uint64_t timestamp,
> +                                   camera_metadata_t *metadata)
> +{
>         camera3_capture_result_t captureResult = {};
>         captureResult.frame_number = descriptor.frameNumber_;
>         captureResult.num_output_buffers = descriptor.buffers_.size();
> @@ -2147,7 +2160,7 @@ void CameraDevice::requestComplete(Request *request)
>                 notifyShutter(descriptor.frameNumber_, timestamp);
>
>                 captureResult.partial_result = 1;
> -               captureResult.result = resultMetadata->get();
> +               captureResult.result = metadata;
>         }
>
>         if (status == CAMERA3_BUFFER_STATUS_ERROR || !captureResult.result) {
> @@ -2164,11 +2177,6 @@ void CameraDevice::requestComplete(Request *request)
>         callbacks_->process_capture_result(callbacks_, &captureResult);
>  }
>
> -std::string CameraDevice::logPrefix() const
> -{
> -       return "'" + camera_->id() + "'";
> -}
> -
>  void CameraDevice::notifyShutter(uint32_t frameNumber, uint64_t timestamp)
>  {
>         camera3_notify_msg_t notify = {};
> diff --git a/src/android/camera_device.h b/src/android/camera_device.h
> index fa652c3c..a42b8dc0 100644
> --- a/src/android/camera_device.h
> +++ b/src/android/camera_device.h
> @@ -101,6 +101,10 @@ private:
>
>         std::tuple<uint32_t, uint32_t> calculateStaticMetadataSize();
>         libcamera::FrameBuffer *createFrameBuffer(const buffer_handle_t camera3buffer);
> +       void reportDescriptor(Camera3RequestDescriptor &descriptor,
> +                             camera3_buffer_status status,
> +                             uint64_t timestamp = 0,
> +                             camera_metadata_t *metadata = nullptr);
>         void notifyShutter(uint32_t frameNumber, uint64_t timestamp);
>         void notifyError(uint32_t frameNumber, camera3_stream_t *stream);
>         std::unique_ptr<CameraMetadata> requestTemplatePreview();
> --
> 2.31.1.498.g6c1eba8ee3d-goog
>