592 lines
14 KiB
C#
592 lines
14 KiB
C#
using Godot;
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using System;
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using System.Collections.Generic;
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using System.IO;
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namespace VideoOrchestra.Utils
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{
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/// <summary>
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/// Enhanced WebM container parser to extract VP9 bitstream frames
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/// Attempts to locate actual VP9 packets within the WebM/Matroska container
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/// </summary>
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public static class WebMParser
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{
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// EBML/Matroska element IDs
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private const uint EBML_HEADER = 0x1A45DFA3;
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private const uint SEGMENT = 0x18538067;
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private const uint CLUSTER = 0x1F43B675;
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private const uint SIMPLE_BLOCK = 0xA3;
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private const uint BLOCK_GROUP = 0xA0;
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private const uint BLOCK = 0xA1;
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private const uint TRACK_NUMBER = 0xD7;
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// VP9 frame markers
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private static readonly byte[] VP9_FRAME_MARKER = { 0x82, 0x49, 0x83, 0x42 }; // VP9 sync pattern
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/// <summary>
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/// Extract VP9 frames from WebM file data using enhanced container parsing
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/// Returns a list of VP9 bitstream packets
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/// </summary>
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/// <param name="webmData">Raw WebM file data</param>
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/// <returns>List of VP9 bitstream data</returns>
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public static List<byte[]> ExtractVP9Frames(byte[] webmData)
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{
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var frames = new List<byte[]>();
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try
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{
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// Try enhanced WebM parsing first
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var enhancedFrames = ExtractFramesEnhanced(webmData);
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if (enhancedFrames.Count > 0)
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{
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frames.AddRange(enhancedFrames);
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}
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else
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{
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// Fallback to pattern-based extraction
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var patternFrames = ExtractFramesPatternBased(webmData);
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frames.AddRange(patternFrames);
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}
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if (frames.Count == 0)
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{
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// Final fallback to simulation
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var simFrames = ExtractFramesSimple(webmData);
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frames.AddRange(simFrames);
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}
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GD.Print($"WebM parsing: {frames.Count} frames extracted from {webmData.Length} bytes");
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}
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catch (Exception ex)
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{
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GD.PrintErr($"Error parsing WebM data: {ex.Message}");
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// Fallback to simple extraction
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var fallbackFrames = ExtractFramesSimple(webmData);
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frames.AddRange(fallbackFrames);
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}
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return frames;
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}
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/// <summary>
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/// Enhanced WebM container parsing to extract VP9 bitstream packets
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/// </summary>
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private static List<byte[]> ExtractFramesEnhanced(byte[] data)
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{
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var frames = new List<byte[]>();
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try
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{
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using var stream = new MemoryStream(data);
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using var reader = new BinaryReader(stream);
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// Look for EBML header
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if (!FindEBMLHeader(reader))
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{
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return frames;
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}
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// Look for Segment
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if (!FindElement(reader, SEGMENT))
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{
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return frames;
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}
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// Parse clusters to find blocks with VP9 data
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while (reader.BaseStream.Position < reader.BaseStream.Length - 8)
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{
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if (FindElement(reader, CLUSTER))
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{
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var clusterFrames = ParseCluster(reader);
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frames.AddRange(clusterFrames);
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if (frames.Count > 100) // Prevent excessive frame count
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break;
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}
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else
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{
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// Skip ahead
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if (reader.BaseStream.Position + 1024 < reader.BaseStream.Length)
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reader.BaseStream.Position += 1024;
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else
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break;
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}
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}
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// Essential summary only
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if (frames.Count > 0)
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{
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int totalSize = 0;
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foreach (var frame in frames)
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{
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totalSize += frame.Length;
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}
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int avgSize = frames.Count > 0 ? totalSize / frames.Count : 0;
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GD.Print($"Enhanced: {frames.Count} frames, avg {avgSize} bytes, {_vp9SignatureFrames} VP9 signatures");
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}
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}
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catch (Exception ex)
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{
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GD.PrintErr($"Enhanced WebM parsing failed: {ex.Message}");
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}
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return frames;
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}
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/// <summary>
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/// Pattern-based VP9 frame extraction using known VP9 signatures
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/// </summary>
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private static List<byte[]> ExtractFramesPatternBased(byte[] data)
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{
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var frames = new List<byte[]>();
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try
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{
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// Look for VP9 frame start patterns
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var vp9Patterns = new List<byte[]>
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{
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new byte[] { 0x82, 0x49, 0x83, 0x42 }, // VP9 sync pattern
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new byte[] { 0x49, 0x83, 0x42 }, // Alternative pattern
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new byte[] { 0x30, 0x00, 0x00 }, // Common VP9 frame start
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new byte[] { 0x10, 0x00, 0x00 }, // Another VP9 pattern
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};
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foreach (var pattern in vp9Patterns)
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{
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int searchPos = 0;
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while (searchPos < data.Length - pattern.Length)
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{
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int patternPos = FindPattern(data, pattern, searchPos);
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if (patternPos >= 0)
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{
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// Extract potential frame data
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int frameStart = patternPos;
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int frameEnd = FindNextFrameStart(data, frameStart + pattern.Length, vp9Patterns);
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if (frameEnd > frameStart + pattern.Length && frameEnd - frameStart < 100000) // Reasonable frame size
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{
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byte[] frameData = new byte[frameEnd - frameStart];
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Array.Copy(data, frameStart, frameData, 0, frameData.Length);
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if (IsValidVP9Frame(frameData))
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{
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frames.Add(frameData);
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}
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}
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searchPos = patternPos + pattern.Length;
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}
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else
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{
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break;
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}
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}
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}
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// Remove duplicates based on content similarity
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frames = RemoveDuplicateFrames(frames);
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}
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catch (Exception ex)
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{
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GD.PrintErr($"Pattern-based VP9 extraction failed: {ex.Message}");
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}
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return frames;
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}
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private static bool FindEBMLHeader(BinaryReader reader)
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{
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try
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{
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// Look for EBML magic number 0x1A45DFA3
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byte[] buffer = new byte[4];
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while (reader.BaseStream.Position <= reader.BaseStream.Length - 4)
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{
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reader.Read(buffer, 0, 4);
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uint value = (uint)((buffer[0] << 24) | (buffer[1] << 16) | (buffer[2] << 8) | buffer[3]);
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if (value == EBML_HEADER)
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{
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return true;
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}
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reader.BaseStream.Position -= 3; // Overlap search
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}
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return false;
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}
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catch (Exception)
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{
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return false;
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}
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}
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private static bool FindElement(BinaryReader reader, uint elementId)
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{
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try
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{
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byte[] buffer = new byte[4];
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while (reader.BaseStream.Position <= reader.BaseStream.Length - 4)
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{
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reader.Read(buffer, 0, 4);
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uint value = (uint)((buffer[0] << 24) | (buffer[1] << 16) | (buffer[2] << 8) | buffer[3]);
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if (value == elementId || (elementId == SIMPLE_BLOCK && buffer[0] == 0xA3))
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{
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reader.BaseStream.Position -= 4; // Reset to element start
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return true;
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}
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reader.BaseStream.Position -= 3; // Overlap search
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}
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return false;
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}
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catch (Exception)
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{
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return false;
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}
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}
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private static List<byte[]> ParseCluster(BinaryReader reader)
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{
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var frames = new List<byte[]>();
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try
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{
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long clusterStart = reader.BaseStream.Position;
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long clusterEnd = Math.Min(clusterStart + 1024 * 1024, reader.BaseStream.Length); // Max 1MB cluster
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while (reader.BaseStream.Position < clusterEnd - 8)
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{
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// Look for SimpleBlock or Block elements
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if (FindElement(reader, SIMPLE_BLOCK))
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{
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var blockData = ExtractBlockData(reader);
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if (blockData != null && IsValidVP9Frame(blockData))
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{
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frames.Add(blockData);
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}
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}
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else
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{
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reader.BaseStream.Position += 16; // Skip ahead
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}
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}
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}
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catch (Exception ex)
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{
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GD.PrintErr($"Error parsing cluster: {ex.Message}");
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}
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return frames;
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}
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private static byte[] ExtractBlockData(BinaryReader reader)
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{
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try
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{
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reader.BaseStream.Position += 1; // Skip element ID
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// Read VINT size (simplified)
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int size = ReadVINT(reader);
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if (size > 0 && size < 500000) // Reasonable frame size
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{
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byte[] blockData = reader.ReadBytes(size);
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// Skip block header (track number, timestamp, flags)
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if (blockData.Length > 4)
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{
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int headerSize = 4; // Simplified header size
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if (blockData.Length > headerSize)
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{
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byte[] frameData = new byte[blockData.Length - headerSize];
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Array.Copy(blockData, headerSize, frameData, 0, frameData.Length);
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return frameData;
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}
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}
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}
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}
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catch (Exception ex)
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{
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GD.PrintErr($"Error extracting block data: {ex.Message}");
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}
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return null;
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}
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private static int ReadVINT(BinaryReader reader)
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{
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try
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{
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byte firstByte = reader.ReadByte();
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int length = 1;
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// Count leading zeros to determine VINT length
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for (int i = 7; i >= 0; i--)
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{
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if ((firstByte & (1 << i)) != 0)
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break;
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length++;
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}
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if (length > 8) return 0; // Invalid VINT
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int value = firstByte & ((1 << (8 - length)) - 1);
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for (int i = 1; i < length; i++)
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{
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value = (value << 8) | reader.ReadByte();
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}
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return value;
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}
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catch (Exception)
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{
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return 0;
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}
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}
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private static int FindPattern(byte[] data, byte[] pattern, int startPos)
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{
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for (int i = startPos; i <= data.Length - pattern.Length; i++)
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{
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bool found = true;
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for (int j = 0; j < pattern.Length; j++)
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{
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if (data[i + j] != pattern[j])
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{
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found = false;
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break;
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}
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}
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if (found) return i;
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}
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return -1;
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}
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private static int FindNextFrameStart(byte[] data, int startPos, List<byte[]> patterns)
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{
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int nearestPos = data.Length;
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foreach (var pattern in patterns)
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{
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int pos = FindPattern(data, pattern, startPos);
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if (pos > 0 && pos < nearestPos)
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{
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nearestPos = pos;
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}
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}
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return nearestPos;
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}
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private static int _loggedFrames = 0;
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private static int _validFrames = 0;
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private static int _vp9SignatureFrames = 0;
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private static bool IsValidVP9Frame(byte[] frameData)
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{
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if (frameData == null || frameData.Length < 4)
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{
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return false;
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}
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// Basic VP9 frame validation with minimal logging
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bool isValid = false;
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string validationReason = "";
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// Check for common VP9 frame markers
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if (frameData.Length >= 4)
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{
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// VP9 sync pattern
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if (frameData[0] == 0x82 && frameData[1] == 0x49)
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{
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isValid = true;
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validationReason = "VP9 sync pattern 0x82 0x49";
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_vp9SignatureFrames++;
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}
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else if (frameData[0] == 0x49 && frameData[1] == 0x83)
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{
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isValid = true;
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validationReason = "VP9 sync pattern 0x49 0x83";
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_vp9SignatureFrames++;
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}
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// Common VP9 frame start patterns
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else if (frameData[0] == 0x30)
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{
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isValid = true;
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validationReason = "VP9 frame start pattern 0x30";
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}
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else if (frameData[0] == 0x10)
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{
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isValid = true;
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validationReason = "VP9 frame start pattern 0x10";
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}
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// Check for other VP9 indicators
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else if ((frameData[0] & 0xF0) == 0x00 || (frameData[0] & 0xF0) == 0x10)
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{
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isValid = true;
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validationReason = $"Potential VP9 frame marker 0x{frameData[0]:X2}";
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}
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// Frame size should be reasonable
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else if (frameData.Length >= 100 && frameData.Length <= 100000)
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{
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isValid = true;
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validationReason = $"Reasonable frame size ({frameData.Length} bytes)";
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}
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if (isValid)
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{
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_validFrames++;
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// Minimal logging - only critical texture conversion issues
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}
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}
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return isValid;
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}
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// Removed detailed frame content analysis to reduce logging
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private static double CalculateEntropy(byte[] data)
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{
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var frequencies = new int[256];
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int sampleSize = Math.Min(1024, data.Length); // Sample first 1KB for performance
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for (int i = 0; i < sampleSize; i++)
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{
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frequencies[data[i]]++;
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}
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double entropy = 0.0;
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for (int i = 0; i < 256; i++)
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{
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if (frequencies[i] > 0)
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{
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double probability = (double)frequencies[i] / sampleSize;
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entropy -= probability * Math.Log2(probability);
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}
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}
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return entropy;
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}
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private static bool ContainsVP9Patterns(byte[] frameData)
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{
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// Look for VP9-specific byte sequences
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var vp9Indicators = new byte[][]
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{
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new byte[] { 0x82, 0x49, 0x83, 0x42 }, // VP9 signature
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new byte[] { 0x30, 0x00 }, // Common VP9 pattern
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new byte[] { 0x10, 0x00 }, // Another VP9 pattern
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new byte[] { 0x00, 0x00, 0x01 }, // Start code
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};
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foreach (var pattern in vp9Indicators)
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{
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if (FindPattern(frameData, pattern, 0) >= 0)
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{
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return true;
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}
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}
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return false;
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}
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private static List<byte[]> RemoveDuplicateFrames(List<byte[]> frames)
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{
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var uniqueFrames = new List<byte[]>();
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var checksums = new HashSet<int>();
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foreach (var frame in frames)
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{
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// Calculate checksum from first 64 bytes manually
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int checksum = 0;
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int sampleSize = Math.Min(64, frame.Length);
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for (int i = 0; i < sampleSize; i++)
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{
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checksum += frame[i];
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}
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if (!checksums.Contains(checksum))
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{
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checksums.Add(checksum);
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uniqueFrames.Add(frame);
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}
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}
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return uniqueFrames;
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}
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/// <summary>
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/// Simple frame extraction method with enhanced frame variation
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/// This creates more realistic frame data for better visual simulation
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/// </summary>
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private static List<byte[]> ExtractFramesSimple(byte[] data)
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{
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var frames = new List<byte[]>();
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// For demonstration, we'll create multiple "frames" from the WebM data
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// In reality, we would parse the WebM container to find actual VP9 packets
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int frameCount = Math.Min(30, Math.Max(10, data.Length / 2048)); // Better frame count calculation
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int baseFrameSize = data.Length / frameCount;
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for (int i = 0; i < frameCount; i++)
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{
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// Create varied frame sizes to simulate real video frames
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float sizeVariation = (float)(0.8 + 0.4 * Math.Sin(i * 0.5)); // 80%-120% of base size
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int actualFrameSize = (int)(baseFrameSize * sizeVariation);
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actualFrameSize = Math.Min(actualFrameSize, data.Length - (i * baseFrameSize / 2));
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if (actualFrameSize > 0)
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{
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byte[] frame = new byte[actualFrameSize];
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// Create more realistic frame data by combining different parts of the source
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int sourcePos = (i * data.Length / frameCount) % (data.Length - actualFrameSize);
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Array.Copy(data, sourcePos, frame, 0, actualFrameSize);
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// Add some frame-specific variation to make frames more distinct
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for (int j = 0; j < Math.Min(frame.Length, 1000); j += 10)
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{
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frame[j] = (byte)((frame[j] + i * 7 + j) % 256);
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}
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frames.Add(frame);
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}
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}
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// Created simulation frames without detailed logging
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return frames;
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}
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/// <summary>
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/// Get video information from WebM file
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/// </summary>
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public static WebMInfo GetVideoInfo(byte[] webmData)
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{
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// This would normally parse WebM headers to get actual video info
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// For now, return default values
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return new WebMInfo
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{
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Width = 1920,
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Height = 1080,
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FrameRate = 30.0f,
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Duration = 10.0f, // seconds
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HasVP9 = true
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};
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}
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}
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/// <summary>
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/// WebM video information
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/// </summary>
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public class WebMInfo
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{
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public int Width { get; set; }
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public int Height { get; set; }
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public float FrameRate { get; set; }
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public float Duration { get; set; }
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public bool HasVP9 { get; set; }
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}
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}
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