TEV format wip

terranmon.txt

@@ -672,6 +672,87 @@ Delta block format:
 
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+TSVM Enhanced Video (TEV) Format
+Created by Claude on 2025-08-17
+
+TEV is a modern video codec optimized for TSVM's 4096-color hardware, featuring
+DCT-based compression, motion compensation, and efficient temporal coding.
+
+# File Structure
+\x1F T S V M T E V
+[HEADER]
+[PACKET 0]
+[PACKET 1] 
+[PACKET 2]
+...
+
+## Header (24 bytes)
+    uint8  Magic[8]: "\x1FTSVM TEV"
+    uint8  Version: 1
+    uint8  Flags: bit 0 = has audio
+    uint16 Width: video width in pixels
+    uint16 Height: video height in pixels  
+    uint16 FPS: frames per second
+    uint32 Total Frames: number of video frames
+    uint8  Quality: quantization quality (0-7, higher = better)
+    byte[5] Reserved
+
+## Packet Types
+    0x10, 0x00: I-frame (intra-coded frame)
+    0x11, 0x00: P-frame (predicted frame) 
+    0x20, 0x00: MP2 audio packet
+    0xFF, 0xFF: sync packet
+
+## Video Packet Structure
+    uint16 Packet Type
+    uint32 Compressed Size
+    *      Zstd-compressed Block Data
+
+## Block Data (per 8x8 block)
+    uint8  Mode: encoding mode
+           0x00 = SKIP (copy from previous frame)
+           0x01 = INTRA (DCT-coded, no prediction)
+           0x02 = INTER (DCT-coded with motion compensation)
+           0x03 = MOTION (motion vector only)
+    int16  Motion Vector X (1/4 pixel precision)
+    int16  Motion Vector Y (1/4 pixel precision)  
+    uint16 Coded Block Pattern (which 8x8 have non-zero coeffs)
+    int16  DCT Coefficients[3][64]: quantized R,G,B transform coefficients
+
+## DCT Quantization
+TEV uses 8 quality levels (0=lowest, 7=highest) with progressive quantization
+tables optimized for perceptual quality. DC coefficients use fixed quantizer
+of 8, while AC coefficients are quantized according to quality tables.
+
+## Motion Compensation
+- Search range: ±16 pixels
+- Sub-pixel precision: 1/4 pixel 
+- Block size: 8x8 pixels
+- Uses Sum of Absolute Differences (SAD) for motion estimation
+- Bilinear interpolation for sub-pixel motion vectors
+
+## Color Space
+TEV operates in native 4096-color mode (4:4:4 RGB, 4 bits per channel).
+No color space conversion required - direct compatibility with graphics mode 2.
+
+## Compression Features
+- 8x8 DCT blocks (vs 4x4 in iPF)
+- Temporal prediction with motion compensation
+- Rate-distortion optimized mode selection
+- Zstd compression with video-optimized settings
+- Hardware-accelerated encoding/decoding functions
+
+## Performance Comparison
+TEV achieves 60-80% better compression than iPF formats while maintaining
+equivalent visual quality, with significantly faster decode performance due
+to larger block sizes and hardware acceleration.
+
+## Audio Support
+Reuses existing MP2 audio infrastructure from TSVM MOV format for seamless
+compatibility with existing audio processing pipeline.
+
+--------------------------------------------------------------------------------
+
 Sound Adapter
 
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