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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef V4L2_CAMERA_HAL_STREAM_FORMAT_H_
     18 #define V4L2_CAMERA_HAL_STREAM_FORMAT_H_
     19 
     20 #include <cstring>
     21 
     22 #include <linux/videodev2.h>
     23 #include "arc/common_types.h"
     24 
     25 namespace v4l2_camera_hal {
     26 
     27 enum FormatCategory {
     28   kFormatCategoryRaw,
     29   kFormatCategoryStalling,
     30   kFormatCategoryNonStalling,
     31   kFormatCategoryUnknown,
     32 };
     33 
     34 class StreamFormat {
     35  public:
     36   StreamFormat(int format, uint32_t width, uint32_t height);
     37   StreamFormat(const v4l2_format& format);
     38   StreamFormat(const arc::SupportedFormat& format);
     39   virtual ~StreamFormat() = default;
     40   // Only uint32_t members, use default generated copy and assign.
     41 
     42   void FillFormatRequest(v4l2_format* format) const;
     43   FormatCategory Category() const;
     44 
     45   // Accessors.
     46   inline uint32_t type() const { return type_; };
     47   inline uint32_t width() const { return width_; };
     48   inline uint32_t height() const { return height_; };
     49   inline uint32_t v4l2_pixel_format() const { return v4l2_pixel_format_; }
     50   inline uint32_t bytes_per_line() const { return bytes_per_line_; };
     51 
     52   bool operator==(const StreamFormat& other) const;
     53   bool operator!=(const StreamFormat& other) const;
     54 
     55   // HAL <-> V4L2 conversions
     56   // Returns 0 for unrecognized.
     57   static uint32_t HalToV4L2PixelFormat(int hal_pixel_format);
     58   // Returns -1 for unrecognized.
     59   static int V4L2ToHalPixelFormat(uint32_t v4l2_pixel_format);
     60 
     61   // ARC++ SupportedFormat Helpers
     62   static bool FindBestFitFormat(const arc::SupportedFormats& supported_formats,
     63                                 const arc::SupportedFormats& qualified_formats,
     64                                 uint32_t fourcc, uint32_t width,
     65                                 uint32_t height,
     66                                 arc::SupportedFormat* out_format);
     67   static bool FindFormatByResolution(const arc::SupportedFormats& formats,
     68                                      uint32_t width, uint32_t height,
     69                                      arc::SupportedFormat* out_format);
     70   static arc::SupportedFormats GetQualifiedFormats(
     71       const arc::SupportedFormats& supported_formats);
     72 
     73  private:
     74   uint32_t type_;
     75   uint32_t v4l2_pixel_format_;
     76   uint32_t width_;
     77   uint32_t height_;
     78   uint32_t bytes_per_line_;
     79 };
     80 
     81 }  // namespace v4l2_camera_hal
     82 
     83 #endif  // V4L2_CAMERA_HAL_STREAM_FORMAT_H_
     84