Initial vp9 decoder implementation

godot-project/scripts/Platform/Android/AndroidVP9Decoder.cs

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+using Godot;
+using System;
+using System.Runtime.InteropServices;
+
+namespace VideoOrchestra.Platform
+{
+    /// <summary>
+    /// Android VP9 decoder implementation using MediaCodec
+    /// </summary>
+    public class AndroidVP9Decoder : IVP9PlatformDecoder
+    {
+        private const int MAX_STREAMS = 3;
+        
+        private ImageTexture[] _textures = new ImageTexture[MAX_STREAMS];
+        private bool _initialized = false;
+        private bool _hardwareEnabled = true;
+        private int _width = 0;
+        private int _height = 0;
+        private VP9DecoderStatus _status = VP9DecoderStatus.Uninitialized;
+        
+        public string PlatformName => "Android";
+        public bool IsHardwareDecodingSupported => CheckMediaCodecSupport();
+        
+        #region Native Library P/Invoke Declarations
+        
+        [DllImport("libvp9orchestra")]
+        private static extern bool vp9_initialize(int width, int height);
+        
+        [DllImport("libvp9orchestra")]
+        private static extern bool vp9_decode_frame(byte[] data, int dataSize, int streamId);
+        
+        [DllImport("libvp9orchestra")]
+        private static extern uint vp9_get_texture_id(int streamId);
+        
+        [DllImport("libvp9orchestra")]
+        private static extern bool vp9_is_hardware_supported();
+        
+        [DllImport("libvp9orchestra")]
+        private static extern void vp9_release();
+        
+        #endregion
+        
+        public AndroidVP9Decoder()
+        {
+            for (int i = 0; i < MAX_STREAMS; i++)
+            {
+                _textures[i] = null;
+            }
+        }
+        
+        private bool CheckMediaCodecSupport()
+        {
+            try
+            {
+                // Check if native library is available and supports hardware decoding
+                return vp9_is_hardware_supported();
+            }
+            catch (DllNotFoundException)
+            {
+                GD.Print("Warning: libvp9orchestra.so not found, hardware decoding not available");
+                return false;
+            }
+            catch (Exception ex)
+            {
+                GD.Print($"Warning: Error checking MediaCodec support: {ex.Message}");
+                return false;
+            }
+        }
+        
+        public bool Initialize(int width, int height, bool enableHardware = true)
+        {
+            try
+            {
+                _width = width;
+                _height = height;
+                _hardwareEnabled = enableHardware && IsHardwareDecodingSupported;
+                
+                // Initialize native MediaCodec decoder
+                bool success = vp9_initialize(width, height);
+                
+                if (success)
+                {
+                    // Initialize Godot textures
+                    for (int i = 0; i < MAX_STREAMS; i++)
+                    {
+                        _textures[i] = new ImageTexture();
+                    }
+                    
+                    _initialized = true;
+                    _status = VP9DecoderStatus.Initialized;
+                    
+                    GD.Print($"Android VP9 decoder initialized: {width}x{height}, Hardware: {_hardwareEnabled}");
+                    return true;
+                }
+                else
+                {
+                    _status = VP9DecoderStatus.Error;
+                    GD.PrintErr("Failed to initialize Android MediaCodec VP9 decoder");
+                    return false;
+                }
+            }
+            catch (DllNotFoundException)
+            {
+                GD.PrintErr("libvp9orchestra.so not found. Make sure the native library is included in the Android build.");
+                _status = VP9DecoderStatus.Error;
+                return false;
+            }
+            catch (Exception ex)
+            {
+                GD.PrintErr($"Error initializing Android VP9 decoder: {ex.Message}");
+                _status = VP9DecoderStatus.Error;
+                return false;
+            }
+        }
+        
+        public bool DecodeFrame(byte[] frameData, int streamId)
+        {
+            if (!_initialized || streamId < 0 || streamId >= MAX_STREAMS)
+            {
+                return false;
+            }
+            
+            if (frameData == null || frameData.Length == 0)
+            {
+                return false;
+            }
+            
+            try
+            {
+                _status = VP9DecoderStatus.Decoding;
+                
+                bool success = vp9_decode_frame(frameData, frameData.Length, streamId);
+                
+                if (success)
+                {
+                    // Update Godot texture with decoded frame
+                    UpdateGodotTexture(streamId);
+                }
+                else
+                {
+                    _status = VP9DecoderStatus.Error;
+                    GD.PrintErr($"Failed to decode frame for stream {streamId}");
+                }
+                
+                return success;
+            }
+            catch (Exception ex)
+            {
+                GD.PrintErr($"Error decoding frame for stream {streamId}: {ex.Message}");
+                _status = VP9DecoderStatus.Error;
+                return false;
+            }
+        }
+        
+        private void UpdateGodotTexture(int streamId)
+        {
+            try
+            {
+                uint textureId = vp9_get_texture_id(streamId);
+                
+                if (textureId > 0)
+                {
+                    // In a full implementation, this would bind the OpenGL texture
+                    // to the Godot ImageTexture. For now, create a placeholder.
+                    
+                    var image = Image.CreateEmpty(_width, _height, false, Image.Format.Rgba8);
+                    
+                    // Different color per stream for testing
+                    var color = streamId switch
+                    {
+                        0 => Colors.Red,
+                        1 => Colors.Green,
+                        2 => Colors.Blue,
+                        _ => Colors.White
+                    };
+                    
+                    image.Fill(color);
+                    _textures[streamId].SetImage(image);
+                    
+                    GD.Print($"Updated texture for Android stream {streamId}, native texture ID: {textureId}");
+                }
+            }
+            catch (Exception ex)
+            {
+                GD.PrintErr($"Failed to update texture for stream {streamId}: {ex.Message}");
+            }
+        }
+        
+        public ImageTexture GetDecodedTexture(int streamId)
+        {
+            if (!_initialized || streamId < 0 || streamId >= MAX_STREAMS)
+            {
+                return null;
+            }
+            
+            return _textures[streamId];
+        }
+        
+        public uint GetNativeTextureId(int streamId)
+        {
+            if (!_initialized || streamId < 0 || streamId >= MAX_STREAMS)
+            {
+                return 0;
+            }
+            
+            try
+            {
+                return vp9_get_texture_id(streamId);
+            }
+            catch (Exception ex)
+            {
+                GD.PrintErr($"Error getting texture ID for stream {streamId}: {ex.Message}");
+                return 0;
+            }
+        }
+        
+        public VP9DecoderStatus GetStatus()
+        {
+            return _status;
+        }
+        
+        public void Release()
+        {
+            try
+            {
+                _status = VP9DecoderStatus.Released;
+                
+                if (_initialized)
+                {
+                    vp9_release();
+                }
+                
+                for (int i = 0; i < MAX_STREAMS; i++)
+                {
+                    _textures[i]?.Dispose();
+                    _textures[i] = null;
+                }
+                
+                _initialized = false;
+                GD.Print("Android VP9 decoder released");
+            }
+            catch (Exception ex)
+            {
+                GD.PrintErr($"Error releasing Android VP9 decoder: {ex.Message}");
+            }
+        }
+        
+        public void Dispose()
+        {
+            Release();
+        }
+    }
+}