The libbw64
library is a lightweight C++ header only library to read and write
BW64 files. BW64 is standardised as Recommendation ITU-R
BS.2088 and the successor of RF64. So
it already contains necessary extensions to support files which are bigger than
4 GB. Apart from that a BW64 file is able to contain the ADM metadata and link
it with the audio tracks in the file. To do that a BW64 file specifies two new
RIFF chunks – the axml
chunk and the chna
chunk. To parse, create, modify
and write the ADM metadata in the axml
chunk you may use the
libadm
library.
Read the documentation to get started.
- no dependencies
- support file sizes bigger than 4 GB (
ds64
chunk) - read and write
axml
andchna
chunks - 16, 24, and 32 bit integer file formats
On macOS you can use homebrew to install the library. You just have to add the EBU NGA homebrew tap and can then use the usual install command.
brew tap ebu/homebrew-nga
brew install libbw64
To manually install the library you have to clone the git repository and then use the CMake (version 3.5 or later) build system to build and install it.
git clone git@github.com:ebu/libbw64.git
cd libbw64
mkdir build && cd build
cmake ..
make
make install
The libbw64
is a header-only library so installing the library is not by all
means necessary. It is also possible to just copy the content of the include
directory to your project and make sure to add the bw64
folder to your
PATH
, that the header files can be found by the compiler.
As the library uses CMake as a build system it is really easy to set up and use
if your project does too. Assuming you have installed the library, the following
code shows a complete CMake example to compile a program which uses the
libbw64
.
cmake_minimum_required(VERSION 3.5)
project(libbw64_example VERSION 1.0.0 LANGUAGES CXX)
find_package(bw64 REQUIRED)
add_executable(example example.cpp)
target_link_libraries(example PRIVATE bw64)
If you prefer not to install the library on your system you can also use the
library as a subproject. You can just add the library as a CMake subproject.
Just add the folder containing the repository to your project and you can use
the bw64
target.
cmake_minimum_required(VERSION 3.5)
project(libbw64_example VERSION 1.0.0 LANGUAGES CXX)
add_subdirectory(submodules/libbw64)
add_executable(example example.cpp)
target_link_libraries(example PRIVATE bw64)
If libbw64
is used as a CMake subproject the default values of the options
BW64_UNIT_TESTS
BW64_EXAMPLES
BW64_PACKAGE_AND_INSTALL
are automatically set to FALSE
.
To use libbw64
simply include the main header file bw64.hpp
and use the
functions bw64::readFile
and bw64::writeFile
to create a BW64Reader
or
BW64Writer
object. The functions return a unique_ptr
to the object.
#include <iostream>
#include <vector>
#include <bw64/bw64.hpp>
const unsigned int BLOCK_SIZE = 4096;
int main(int argc, char const* argv[]) {
if (argc != 2) {
std::cout << "usage: " << argv[0] << " [INFILE]" << std::endl;
exit(1);
}
auto inFile = bw64::readFile(argv[1]);
auto axmlChunk = inFile->axmlChunk(); // get axml chunk
auto chnaChunk = inFile->chnaChunk(); // get chna chunk
std::vector<float> buffer(BLOCK_SIZE * inFile->channels());
while (!inFile->eof()) {
auto readFrames = inFile->read(&buffer[0], BLOCK_SIZE);
// TODO: process samples
}
return 0;
}
#include <iostream>
#include <vector>
#include <bw64/bw64.hpp>
const unsigned int BLOCK_SIZE = 4096;
int main(int argc, char const* argv[]) {
if (argc != 2) {
std::cout << "usage: " << argv[0] << " [OUTFILE]" << std::endl;
exit(1);
}
auto outFile = bw64::writeFile(argv[1]);
std::vector<float> buffer(BLOCK_SIZE);
for (int i = 0; i < 100; ++i) {
// TODO: fill vector with data
outFile->write(&buffer.front(), BLOCK_SIZE);
}
return 0;
}
See the examples folder in the repository for more examples.
libbw64 is originally a development of the IRT.
This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 687645.
Copyright 2018-2020 The libbw64 Authors
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.