[libcamera-devel] [PATCH v4 02/10] android: camera_device: Generate JPEG sizes

[Jacopo Mondi]

When producing the list of image resolutions to claim as supported by the
camera HAL, the JPEG stream was assumed to be 'always valid' as, at the
time, there was no JPEG support in place at all.

With the introduction of support for JPEG compression, reporting
non-valid sizes as supported obviously causes troubles.

In order to avoid reporting non-supported resolutions as supported,
produce the list of available JPEG sizes by using the ones supported
by the YCbCr_420_888 format, from which the JPEG stream is encoded.

Reviewed-by: Hirokazu Honda <hiroh at chromium.org>
Reviewed-by: Niklas Söderlund <niklas.soderlund at ragnatech.se>
Reviewed-by: Kieran Bingham <kieran.bingham at ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo at jmondi.org>
---
 src/android/camera_device.cpp | 40 ++++++++++++++++++++++-------------
 1 file changed, 25 insertions(+), 15 deletions(-)

diff --git a/src/android/camera_device.cpp b/src/android/camera_device.cpp
index ebebdac38e28..3be2dac28f9c 100644
--- a/src/android/camera_device.cpp
+++ b/src/android/camera_device.cpp
@@ -369,17 +369,21 @@ int CameraDevice::initializeStreamConfigurations()
 		const std::vector<PixelFormat> &libcameraFormats =
 			camera3Format.libcameraFormats;
 
+		/*
+		 * JPEG is always supported, either produced directly by the
+		 * camera, or encoded in the HAL.
+		 */
+		if (androidFormat == HAL_PIXEL_FORMAT_BLOB) {
+			formatsMap_[androidFormat] = formats::MJPEG;
+			continue;
+		}
+
 		/*
 		 * Test the libcamera formats that can produce images
 		 * compatible with the format defined by Android.
 		 */
 		PixelFormat mappedFormat;
 		for (const PixelFormat &pixelFormat : libcameraFormats) {
-			/* \todo Fixed mapping for JPEG. */
-			if (androidFormat == HAL_PIXEL_FORMAT_BLOB) {
-				mappedFormat = formats::MJPEG;
-				break;
-			}
 
 			/*
 			 * The stream configuration size can be adjusted,
@@ -422,19 +426,25 @@ int CameraDevice::initializeStreamConfigurations()
 			cfg.size = res;
 
 			CameraConfiguration::Status status = cameraConfig->validate();
-			/*
-			 * Unconditionally report we can produce JPEG.
-			 *
-			 * \todo The JPEG stream will be implemented as an
-			 * HAL-only stream, but some cameras can produce it
-			 * directly. As of now, claim support for JPEG without
-			 * inspecting where the JPEG stream is produced.
-			 */
-			if (androidFormat != HAL_PIXEL_FORMAT_BLOB &&
-			    status != CameraConfiguration::Valid)
+			if (status != CameraConfiguration::Valid)
 				continue;
 
 			streamConfigurations_.push_back({ res, androidFormat });
+
+			/*
+			 * If the format is HAL_PIXEL_FORMAT_YCbCr_420_888
+			 * from which JPEG is produced, add an entry for
+			 * the JPEG stream.
+			 *
+			 * \todo Wire the JPEG encoder to query the supported
+			 * sizes provided a list of formats it can encode.
+			 *
+			 * \todo Support JPEG streams produced by the Camera
+			 * natively.
+			 */
+			if (androidFormat == HAL_PIXEL_FORMAT_YCbCr_420_888)
+				streamConfigurations_.push_back(
+					{ res, HAL_PIXEL_FORMAT_BLOB });
 		}
 	}
 
-- 
2.28.0