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_CACHED_FRAME_H_ 7 #define HAL_USB_CACHED_FRAME_H_ 8 9 #include <memory> 10 11 #include <camera/CameraMetadata.h> 12 13 #include "arc/image_processor.h" 14 15 namespace arc { 16 17 // CachedFrame contains a source FrameBuffer and a cached, converted 18 // FrameBuffer. The incoming frames would be converted to YU12, the default 19 // format of libyuv, to allow convenient processing. 20 class CachedFrame { 21 public: 22 CachedFrame(); 23 ~CachedFrame(); 24 25 // SetSource() doesn't take ownership of |frame|. The caller can only release 26 // |frame| after calling UnsetSource(). SetSource() immediately converts 27 // incoming frame into YU12. Return non-zero values if it encounters errors. 28 // If |rotate_degree| is 90 or 270, |frame| will be cropped, rotated by the 29 // specified amount and scaled. 30 // If |rotate_degree| is -1, |frame| will not be cropped, rotated, and scaled. 31 // This function will return an error if |rotate_degree| is not -1, 90, or 32 // 270. 33 int SetSource(const FrameBuffer* frame, int rotate_degree); 34 void UnsetSource(); 35 36 uint8_t* GetSourceBuffer() const; 37 size_t GetSourceDataSize() const; 38 uint32_t GetSourceFourCC() const; 39 uint8_t* GetCachedBuffer() const; 40 uint32_t GetCachedFourCC() const; 41 42 uint32_t GetWidth() const; 43 uint32_t GetHeight() const; 44 45 // Calculate the output buffer size when converting to the specified pixel 46 // format. |fourcc| is defined as V4L2_PIX_FMT_* in linux/videodev2.h. Return 47 // 0 on error. 48 size_t GetConvertedSize(int fourcc) const; 49 50 // Caller should fill everything except |data_size| and |fd| of |out_frame|. 51 // The function will do format conversion and scale to fit |out_frame| 52 // requirement. 53 // If |video_hack| is true, it outputs YU12 when |hal_pixel_format| is YV12 54 // (swapping U/V planes). Caller should fill |fourcc|, |data|, and 55 // Return non-zero error code on failure; return 0 on success. 56 int Convert(const android::CameraMetadata& metadata, FrameBuffer* out_frame, 57 bool video_hack = false); 58 59 private: 60 int ConvertToYU12(); 61 // When we have a landscape mounted camera and the current camera activity is 62 // portrait, the frames shown in the activity would be stretched. Therefore, 63 // we want to simulate a native portrait camera. That's why we want to crop, 64 // rotate |rotate_degree| clockwise and scale the frame. HAL would not change 65 // CameraInfo.orientation. Instead, framework would fake the 66 // CameraInfo.orientation. Framework would then tell HAL how much the frame 67 // needs to rotate clockwise by |rotate_degree|. 68 int CropRotateScale(int rotate_degree); 69 70 const FrameBuffer* source_frame_; 71 // const V4L2FrameBuffer* source_frame_; 72 73 // Temporary buffer for cropped and rotated results. 74 std::unique_ptr<uint8_t[]> cropped_buffer_; 75 size_t cropped_buffer_capacity_; 76 77 // Cache YU12 decoded results. 78 std::unique_ptr<AllocatedFrameBuffer> yu12_frame_; 79 80 // Temporary buffer for scaled results. 81 std::unique_ptr<AllocatedFrameBuffer> scaled_frame_; 82 }; 83 84 } // namespace arc 85 86 #endif // HAL_USB_CACHED_FRAME_H_ 87
