FFmpeg_droidFix.AutoGen 7.1.1

What changed from original project:

As very beginning of making projectFrameCut, I selected this library to decode videos, etc. because this thing can let me call FFmpeg and read out frame directly, by all C# Managed code, save my time and increase the speed.

When I'm trying to test projectFrameCut on Android, while I try to call this library on the Android platform, I found that I kept receiving the "PlatformNotSupportedException" error. After some diagnosis, I discovered that it was caused by the changes in .NET 5+ to System.OSPlatform. So that I fixed this file by use the modern System.OperatingSystem API, also I added a Function Resolver for Android.

But, I found this is not the only problem while running on Android devices. After this fix, I start receive a "DllImportException" when I try to call the library, after days of fix, I finally discover why: "libdl.so.2" isn't exists on Android devices, and dlopen moved to "libc.so" instead of libdl. I also added a user-friendly exception processing telling why libraries failed to load.

I also added a property AddVersionSuffixToLibraryPaththat allows you to manually disable adding a version suffix to library names when attempting to load a library. This can resolve issues where certain platforms remove the version suffix when packaging the application.

Other things, and contents below, are unchanged. In addition, this library is fully compatible with the original FFmpeg.AutoGen library.

Important

The FFmpeg API is vast and complex and this project exposes it with minimum modifications - support is very limited. Please consider to ask how to questions on stackoverflow.com or in special repository on github.com. The community may be able to offer some assistance but you will largely be on your own. As another option you can search for a solution in C(lang) as with some effort you can convert it to C#. Here repository with C# converted examples: https://github.com/stjeong/ffmpeg_autogen_cs

FFmpeg.AutoGen

FFmpeg auto generated unsafe bindings for C#/.NET and Mono.

Usage

The basic example of the library usage: video decoding, conversion and frame extraction to jpeg is included in FFmpeg.AutoGen.Example project.
For the more sophisticated operations please refer to offical ffmpeg Documentation expecially API section of it. Nuget packages version uses semantic versioning and in sync with MAJOR and MINOR version of FFmpeg as PATCH incremets does not changing API.

• on Windows:
  Native ffmpeg libraries are pre bundled in this repository, please note the are GPL(!) libraries. The x64 libraries source from CODEX FFMPEG. Please check to example project it shows how specify path to libraries.

• on OS X:
  Install ffmpeg via Homebrew:

brew install ffmpeg

Normally you need to set static ffmpeg.RootPath = with full path to FFmpeg libraries.

• on Android (.NET MAUI): First, add these code to MauiProgram.cs:

#if ANDROID
ffmpeg.RootPath = Android.App.Application.Context.ApplicationInfo.NativeLibraryDir;
JavaSystem.LoadLibrary("c");
#endif

Second, create a directory inside <your .NET MAUI project root path>/Platforms/Android/, name it whatever you want. Create a folder named same as the FFmpeg libraries' ABI name (like arm64-v8a) your get/compile inside the folder your created. Put all .so files inside it, don't add any suffix or prefix.

Then, add these things to the project's .csproj file:

<ItemGroup Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'android'">
		<AndroidNativeLibrary Include="Platforms\Android\<name of the directory your named>\**\*.so" />
</ItemGroup>

Don't forget to replace <name of the directory your named> to the name of the directory your named in 2nd step.

Your project's file structure should like this:

.
|   
|
\---Platforms
    +---Android
    |   |   ......
    |   |
    |   +---Assets
    |   +---ffmpeg
    |   |   \---arm64-v8a
    |   |           libavcodec.so
    |   |           libavfilter.so
    |   |           libavformat.so
    |   |           libavutil.so
    |   |           libswresample.so
    |   |           libswscale.so
    |   |
    |   +---Resources
    |   ......
    |
......

• on Linux:
  Use your package manager of choice. Normally you need to set static ffmpeg.RootPath = with full path to FFmpeg libraries.

Generation

The bindings generator uses CppSharp.

Prerequisites:

• Visual Studio 2022 with C# and C++ desktop development workloads and Windows SDK for desktop.

Steps to generate:

• Run FFmpeg.AutoGen.CppSharpUnsafeGenerator;
• All files with extension *.g.cs in FFmpeg.AutoGen project will be regenerated.

License

Copyright © Ruslan Balanukhin 2023 All rights reserved.

Distributed under the GNU Lesser General Public License (LGPL) version 3.
http://www.gnu.org/licenses/lgpl.html

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.