如何使用LibRaw获取CR2图像的原始数据（c ++）

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LibRaw是一个从数码照相机读取RAW文件的库（CRW / CR2，NEF，RAF，DNG，MOS，KDC，DCR等;几乎支持所有RAW格式）。我想知道如何使用LibRaw来获取Canon CR2图像的原始数据。

typedef struct
{
  ushort                      (*image)[4] ;
  libraw_image_sizes_t        sizes;
  libraw_iparams_t            idata;
  libraw_lensinfo_t           lens;
  libraw_makernotes_t         makernotes;
  libraw_shootinginfo_t       shootinginfo;
  libraw_output_params_t      params;
  unsigned int                progress_flags;
  unsigned int                process_warnings;
  libraw_colordata_t          color;
  libraw_imgother_t           other;
  libraw_thumbnail_t          thumbnail;
  libraw_rawdata_t            rawdata;
  void                *parent_class;
} libraw_data_t;
typedef struct
{
  void          *raw_alloc;
  ushort        *raw_image;
  ushort        (*color4_image)[4] ;
  ushort        (*color3_image)[3];
  float         *float_image;
  float         (*float3_image)[3];
  float         (*float4_image)[4];
  short  (*ph1_cblack)[2];//
  short  (*ph1_rblack)[2];//
  libraw_iparams_t  iparams;//
  libraw_image_sizes_t sizes;//
  libraw_internal_output_params_t ioparams;//
  libraw_colordata_t color;//
} libraw_rawdata_t;

这是RAW数据的数据结构，我不知道执行那些函数可以填充这些数组以及最原始数据存储在哪个结构中。