1 /* Copyright 2017 The Chromium OS Authors. All rights reserved. 2 * Use of this source code is governed by a BSD-style license that can be 3 * found in the LICENSE file. 4 */ 5 6 #ifndef HAL_USB_IMAGE_PROCESSOR_H_ 7 #define HAL_USB_IMAGE_PROCESSOR_H_ 8 9 #include <string> 10 11 // FourCC pixel formats (defined as V4L2_PIX_FMT_*). 12 #include <linux/videodev2.h> 13 // Declarations of HAL_PIXEL_FORMAT_XXX. 14 #include <system/graphics.h> 15 16 #include <camera/CameraMetadata.h> 17 #include "frame_buffer.h" 18 19 namespace arc { 20 21 // V4L2_PIX_FMT_YVU420(YV12) in ImageProcessor has alignment requirement. 22 // The stride of Y, U, and V planes should a multiple of 16 pixels. 23 struct ImageProcessor { 24 // Calculate the output buffer size when converting to the specified pixel 25 // format. |fourcc| is defined as V4L2_PIX_FMT_* in linux/videodev2.h. 26 // Return 0 on error. 27 static size_t GetConvertedSize(int fourcc, uint32_t width, uint32_t height); 28 29 // Return whether this class supports the provided conversion. 30 static bool SupportsConversion(uint32_t from_fourcc, uint32_t to_fourcc); 31 32 // Convert format from |in_frame.fourcc| to |out_frame->fourcc|. Caller should 33 // fill |data|, |buffer_size|, |width|, and |height| of |out_frame|. The 34 // function will fill |out_frame->data_size|. Return non-zero error code on 35 // failure; return 0 on success. 36 static int ConvertFormat(const android::CameraMetadata& metadata, 37 const FrameBuffer& in_frame, FrameBuffer* out_frame); 38 39 // Scale image size according to |in_frame| and |out_frame|. Only support 40 // V4L2_PIX_FMT_YUV420 format. Caller should fill |data|, |width|, |height|, 41 // and |buffer_size| of |out_frame|. The function will fill |data_size| and 42 // |fourcc| of |out_frame|. 43 static int Scale(const FrameBuffer& in_frame, FrameBuffer* out_frame); 44 }; 45 46 } // namespace arc 47 48 #endif // HAL_USB_IMAGE_PROCESSOR_H_ 49
