Aegisub/libaegisub/include/libaegisub/file_mapping.h
Thomas Goyne a30d6121fd Don't block the UI while decoding audio for the caches
Simply zero the memory for audio which hasn't been decoded yet, modify
the audio renderer to avoid caching blocks which aren't ready yet, and
add a progress indiciator to the audio display scrollbar.
2014-04-22 12:34:20 -07:00

66 lines
2.2 KiB
C++

// Copyright (c) 2014, Thomas Goyne <plorkyeran@aegisub.org>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
// Aegisub Project http://www.aegisub.org/
#include <libaegisub/fs_fwd.h>
#include <boost/interprocess/detail/os_file_functions.hpp>
#include <cstdint>
namespace agi {
// boost::interprocess::file_mapping is awesome and uses CreateFileA on Windows
class file_mapping {
boost::interprocess::file_handle_t handle;
public:
file_mapping(fs::path const& filename, bool temporary);
~file_mapping();
boost::interprocess::mapping_handle_t get_mapping_handle() const {
return boost::interprocess::ipcdetail::mapping_handle_from_file_handle(handle);
}
};
class read_file_mapping {
file_mapping file;
std::unique_ptr<boost::interprocess::mapped_region> region;
uint64_t mapping_start = 0;
uint64_t file_size = 0;
public:
read_file_mapping(fs::path const& filename);
~read_file_mapping();
uint64_t size() const { return file_size; }
const char *read(int64_t offset, uint64_t length);
const char *read(); // Map the entire file
};
class temp_file_mapping {
file_mapping file;
uint64_t file_size = 0;
std::unique_ptr<boost::interprocess::mapped_region> read_region;
uint64_t read_mapping_start = 0;
std::unique_ptr<boost::interprocess::mapped_region> write_region;
uint64_t write_mapping_start = 0;
public:
temp_file_mapping(fs::path const& filename, uint64_t size);
~temp_file_mapping();
const char *read(int64_t offset, uint64_t length);
char *write(int64_t offset, uint64_t length);
};
}