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efficiently read in one hyperslab read instead of multiple reads in a loop
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maliakal_d
2025-06-05 00:38:27 +02:00
parent 76b8872fe6
commit a3f831dc9e
2 changed files with 27 additions and 32 deletions
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10
include/aare/Hdf5File.hpp
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@@ -38,8 +38,9 @@ struct H5Handles {
offset[0] = static_cast<hsize_t>(frame_index);
}
void get_data_into(size_t frame_index, std::byte *frame_buffer) {
void get_data_into(size_t frame_index, std::byte *frame_buffer, size_t n_frames = 1) {
seek(frame_index);
count[0] = static_cast<hsize_t>(n_frames);
//std::cout << "offset:" << offset << " count:" << count << std::endl;
dataspace.selectHyperslab(H5S_SELECT_SET, count.data(), offset.data());
dataset.read(frame_buffer, datatype, *memspace, dataspace);
@@ -137,17 +138,18 @@ class Hdf5File : public FileInterface {
/**
* @brief read the frame at the given frame index into the image buffer
* @param frame_number frame number to read
* @param n_frames number of frames to read (default is 1)
* @param image_buf buffer to store the frame
*/
void get_frame_into(size_t frame_index, std::byte *frame_buffer,
DetectorHeader *header = nullptr);
void get_frame_into(size_t frame_index, std::byte *frame_buffer, size_t n_frames = 1, DetectorHeader *header = nullptr);
/**
* @brief read the frame at the given frame index into the image buffer
* @param frame_index frame number to read
* @param n_frames number of frames to read (default is 1)
* @param frame_buffer buffer to store the frame
*/
void get_data_into(size_t frame_index, std::byte *frame_buffer);
void get_data_into(size_t frame_index, std::byte *frame_buffer, size_t n_frames = 1);
/**
* @brief read the header at the given frame index into the header buffer