[WIP] Make it usable in a Xamarin.Forms project

README.md

@@ -1,27 +1,28 @@
 # XamarinAndroidFFmpeg (Xamarin.FFmpeg)
-FFmpeg library to run ffmeg commands over Xamarin.Android.
+FFmpeg library to run ffmeg commands over Xamarin.Forms
 
 ## About
-<ul>
-<li>Created to support a solution that needed ffmpeg to control camera devices.</li>
-</ul>
+* Created to support a solution that needed ffmpeg to control camera devices.
+* Edited to allow usage on Xamarin.Forms
 
 ## Big thanks
-<ul>
-<li>FFmpeg library adapted from https://github.com/neurospeech/xamarin-android-ffmpeg</li>
-<li>Original library in java https://github.com/WritingMinds/ffmpeg-android-java</li>
-</ul>
+* FFmpeg library adapted from https://github.com/neurospeech/xamarin-android-ffmpeg
+* Original library in java https://github.com/WritingMinds/ffmpeg-android-java
 
 ## License
-<ul>
-  <li>MIT</li>
-  <li>Besides that, to use this library you must accept the licensing terms mentioned in the source project at https://github.com/WritingMinds/ffmpeg-android-java</li>
-</ul>
+* MIT
+* Besides that, to use this library you must accept the licensing terms mentioned in the source project at https://github.com/WritingMinds/ffmpeg-android-java
 
 ## Nuget package
 You can download Xamarin.FFmpeg package from Nuget Package Manager or run following command in Nuget Package Console.
 ```
-Install-Package Xamarin.FFmpeg -Version 1.0.4
+Install-Package Xamarin.FFmpeg
 ```
 ## Usage
-On the way...
+
+### Android
+
+In MainActivity.cs before ``Forms.Init(this, bundle)``:
+```cs
+Xamarin.FFmpeg.Android.Init.Initialize(this.BaseContext);
+```

Xamarin.FFmpeg.Android/FFMpegSource.cs

@@ -0,0 +1,51 @@
+using System;
+
+namespace Xamarin.FFmpeg.Android
+{
+    public class FFmpegSource : IFFmpegSource
+    {
+        public string FFmpegVersion { get; } = "3.0.1.1";
+        public string Url { get; set; }
+        public string Arch { get; }
+        public string Hash { get; }
+        public Func<string, bool> IsArch { get; }
+
+        public FFmpegSource(string arch, Func<string, bool> isArch, string hash)
+        {
+            Arch = arch;
+            IsArch = isArch;
+            Hash = hash;
+            Url = $"https://raw.githubusercontent.com/gperozzo/XamarinAndroidFFmpeg/master/binary/{FFmpegVersion}/{Arch}/ffmpeg";
+        }
+
+        public static FFmpegSource[] Sources = new FFmpegSource[] {
+            new FFmpegSource("arm", x=> !x.EndsWith("86"), "yRVoeaZATQdZIR/lZxMsIa/io9U="),
+            new FFmpegSource("x86", x=> x.EndsWith("86"), "mU4QKhrLEO0aROb9N7JOCJ/rVTA==")
+        };
+
+        internal static FFmpegSource Get()
+        {
+            string osArchitecture = Java.Lang.JavaSystem.GetProperty("os.arch");
+
+            foreach (var source in Sources)
+            {
+                if (source.IsArch(osArchitecture))
+                    return source;
+            }
+
+            return null;
+        }
+
+        public void SetUrl(string url)
+        {
+            Url = url;
+        }
+
+        public bool IsHashMatch(byte[] data)
+        {
+            var sha = System.Security.Cryptography.SHA1.Create();
+            string h = Convert.ToBase64String(sha.ComputeHash(data));
+            return h == Hash;
+        }
+    }
+}