org.monte.media.avi.ZMBVCodecCore Maven / Gradle / Ivy
/*
* @(#)ZMBVCodecCore.java 1.0 2011-08-29
*
* Copyright (c) 2011 Werner Randelshofer, Goldau, Switzerland.
* All rights reserved.
*
* You may not use, copy or modify this file, except in compliance with the
* license agreement you entered into with Werner Randelshofer.
* For details see accompanying license terms.
*/
package org.monte.media.avi;
//import com.jcraft.jzlib.InflaterInputStream;
import java.util.zip.InflaterInputStream;
import java.io.IOException;
import org.monte.media.io.AppendableByteArrayInputStream;
import org.monte.media.io.ByteArrayImageInputStream;
import org.monte.media.io.UncachedImageInputStream;
import java.nio.ByteOrder;
import javax.imageio.stream.ImageInputStream;
import static java.lang.Math.*;
/**
* Implements the DosBox Capture Codec {@code "ZMBV"}.
*
* This is a codec added to the DosBox project to capture screen data
* (like Vmware VMNC).
*
* This codec employs ZLIB compression and has intraframes and delta frames.
* Delta frames seem to have blocks either copied from the previous frame or
* XOR'ed with some block from the previous frame.
*
* The FourCC for this codec is ZMBV which ostensibly stands for Zip Motion
* Blocks Video. The data is most commonly stored in AVI files.
*
* Data Format
* Byte 0 of a ZMBV data chunk contains the following flags:
*
* bits 7-2 undefined
* bit 1 palette change
* bit 0 1 = intraframe, 0 = interframe
*
*
* If the frame is an intra frame as indicated by bit 0 of byte 0, the next
* 6 bytes in the data chunk are formatted as follows:
*
* byte 1 major version
* byte 2 minor version
* byte 3 compression type (0 = uncompressed, 1 = zlib-compressed)
* byte 4 video format
* byte 5 block width
* byte 6 block height
*
* Presently, the only valid major/minor version pair is 0/1. A block width or
* height of 0 is invalid. These are the video modes presently defined:
*
* 0 none
* 1 1 bit/pixel, palettized
* 2 2 bits/pixel, palettized
* 3 4 bits/pixel, palettized
* 4 8 bits/pixel, palettized
* 5 15 bits/pixel
* 6 16 bits/pixel
* 7 24 bits/pixel
* 8 32 bits/pixel
*
*
* Presently, only modes 4 (8 bpp), 5 (15 bpp), 6 (16 bpp) and 8 (32 bpp) are
* supported.
*
* If the compression type is 1, the remainder of the data chunk is compressed
* using the standard zlib package. Decompress the data before proceeding with
* the next step. Otherwise, proceed to the next step. Also note that you must
* reset zlib for intraframes.
*
* If bit 1 of the frame header (palette change) is set then the first 768
* bytes of the uncompressed data represent 256 red-green-blue palette triplets.
* Each component is one byte and ranges from 0..255.
*
* An intraframe consists of 768 bytes of palette data (for palettized modes)
* and raw frame data.
*
* An interframe is comprised of up to three parts:
*
* - if palette change flag was set then first 768 bytes represent XOR'ed
* palette difference
* - block info (2 bytes per block, padded to 4 bytes length)
* - block differences
*
* Block info is composed from a motion vector and a flag: first byte is
* (dx << 1) | flag, second byte is (dy << 1). Motion vectors can go
* out of bounds and in that case you need to zero the out-of-bounds part.
* Also note that currently motion vectors are limited to a range of (-16..16).
* Flag tells whether the codec simply copies the block from the decoded offset
* or copies it and XOR's it with data from block differences. All XORing for
* 15/16 bpp and 32 bpp modes is done with little-endian integers.
*
* Interframe decoding can be done this way:
*
* for each block {
* a = block_info[current_block][0];
* b = block_info[current_block][1];
* dx = a >> 1;
* dy = b >> 1;
* flag = a & 1;
* copy block from offset (dx, dy) from previous frame.
* if (flag) {
* XOR block with data read from stream.
* }
* }
*
*
* References
* http://wiki.multimedia.cx/index.php?title=ZMBV
*
*
* Note: We use the JZLib library for decoding compressed input streams,
* because the {@code javax.zip.InflaterInputStream} sometimes fails to decode
* the data.
*
* *
* @author Werner Randelshofer
* @version 1.0 2011-08-29 Created.
*/
public class ZMBVCodecCore {
public final static int VIDEOMODE_NONE = 0;
public final static int VIDEOMODE_1_BIT_PALETTIZED = 1;
public final static int VIDEOMODE_2_BIT_PALETTIZED = 2;
public final static int VIDEOMODE_4_BIT_PALETTIZED = 3;
public final static int VIDEOMODE_8_BIT_PALETTIZED = 4;
public final static int VIDEOMODE_15_BIT_BGR = 5;
public final static int VIDEOMODE_16_BIT_BGR = 6;
public final static int VIDEOMODE_24_BIT_BGR = 7;
public final static int VIDEOMODE_32_BIT_BGR = 8;
public final static int COMPRESSION_NONE = 0;
public final static int COMPRESSION_ZLIB = 1;
/**
*
* @param inDat Input data.
* @param off Input data offset.
* @param length Input data length.
* @param outDat Output data. 32 bits per pixel: {palette index, red, green, blue}.
* @param prevDat Previous output data array. This is needed because the
* codec uses double buffering. 32 bits per pixel: {palette index, red, green, blue}.
* @param width Image width.
* @param height Image height.
* @param state Codec state.
* @return true if keyframe.
*/
private int majorVersion;
private int minorVersion;
private int compressionType;
private int videoFormat;
private int blockWidth, blockHeight;
private InflaterInputStream inflaterInputStream;
private AppendableByteArrayInputStream byteArrayInputStream;
private int[] palette;
private byte[] blockDataBuf;
private byte[] blockHeaderBuf;
/** Decodes to 32-bit RGB.
* Returns true if a key-frame was decoded.
*/
public boolean decode(byte[] inDat, int off, int length, int[] outDat, int[] prevDat, int width, int height, boolean onlyDecodeIfKeyframe) {
boolean isKeyframe = false;
try {
ImageInputStream in = new ByteArrayImageInputStream(inDat, off, length, ByteOrder.LITTLE_ENDIAN);
int flags = in.readUnsignedByte();
isKeyframe = (flags & 1) != 0;
if (onlyDecodeIfKeyframe && !isKeyframe) {
System.out.println("ZMBVCodec cannot decode delta without preceeding keyframe.");
return false;
}
if (isKeyframe) {
// => Key frame
//System.out.println("ZMBVCode Keyframe w,h=" + width + "," + height);
majorVersion = in.readUnsignedByte();
minorVersion = in.readUnsignedByte();
compressionType = in.readUnsignedByte();
videoFormat = in.readUnsignedByte();
blockWidth = in.readUnsignedByte();
blockHeight = in.readUnsignedByte();
}
if (majorVersion != 0 || minorVersion != 1) {
System.err.println("unsupported version " + majorVersion + "." + minorVersion);
return isKeyframe;
}
switch (compressionType) {
case COMPRESSION_ZLIB:
if (!isKeyframe && inflaterInputStream != null) {
// => streams are present.
// Append new data.
AppendableByteArrayInputStream bais = byteArrayInputStream;
bais.appendBuffer(inDat, (int) in.getStreamPosition() + off, (int) (length - in.getStreamPosition()), true);
} else {
// => Keyframe or no Inflater Stream present. Create new one, and ensure
// that we can append new data to it later on.
if (byteArrayInputStream != null) {
byteArrayInputStream.setBuffer(inDat, (int) in.getStreamPosition() + off, (int) (length - in.getStreamPosition()));
} else {
byteArrayInputStream = new AppendableByteArrayInputStream(inDat.clone(), (int) in.getStreamPosition() + off, (int) (length - in.getStreamPosition()));
}
if (inflaterInputStream != null) {
inflaterInputStream.close();
}
inflaterInputStream = new InflaterInputStream(byteArrayInputStream);
}
in = new UncachedImageInputStream(inflaterInputStream, ByteOrder.LITTLE_ENDIAN);
break;
case COMPRESSION_NONE:
System.out.println(" NO COMPRESSION");
return isKeyframe;
default:
System.err.println("unsupported compression type " + compressionType);
return isKeyframe;
}
switch (videoFormat) {
case VIDEOMODE_8_BIT_PALETTIZED:
decode8to32(in, outDat, prevDat, flags, width, height);
break;
case VIDEOMODE_15_BIT_BGR:
decode15to32(in, outDat, prevDat, flags, width, height);
break;
case VIDEOMODE_16_BIT_BGR:
decode16to32(in, outDat, prevDat, flags, width, height);
break;
case VIDEOMODE_32_BIT_BGR:
decode32to32(in, outDat, prevDat, flags, width, height);
break;
default:
throw new UnsupportedOperationException("Unsupported video format " + videoFormat);
}
} catch (IOException ex) {
//System.out.println("ZMBVCodecCore "+ex);
System.err.println("ZMBVCodecCore decoding, isKeyframe=" + isKeyframe);
ex.printStackTrace();
}
return isKeyframe;
}
/** Decodes to 8-bit palettised.
* Returns true if a key-frame was decoded.
*/
public boolean decode(byte[] inDat, int off, int length, byte[] outDat, byte[] prevDat, int width, int height, boolean onlyDecodeIfKeyframe) {
boolean isKeyframe = false;
try {
ImageInputStream in = new ByteArrayImageInputStream(inDat, off, length, ByteOrder.LITTLE_ENDIAN);
int flags = in.readUnsignedByte();
isKeyframe = (flags & 1) != 0;
if (onlyDecodeIfKeyframe && !isKeyframe) {
System.out.println("ZMBVCodec cannot decode delta without preceeding keyframe.");
return false;
}
if (isKeyframe) {
// => Key frame
//System.out.println("ZMBVCode Keyframe w,h=" + width + "," + height);
majorVersion = in.readUnsignedByte();
minorVersion = in.readUnsignedByte();
compressionType = in.readUnsignedByte();
videoFormat = in.readUnsignedByte();
blockWidth = in.readUnsignedByte();
blockHeight = in.readUnsignedByte();
}
if (majorVersion != 0 || minorVersion != 1) {
System.err.println("unsupported version " + majorVersion + "." + minorVersion);
return isKeyframe;
}
switch (compressionType) {
case COMPRESSION_ZLIB:
if (!isKeyframe && inflaterInputStream != null) {
// => streams are present.
// Append new data.
AppendableByteArrayInputStream bais = byteArrayInputStream;
bais.appendBuffer(inDat, (int) in.getStreamPosition() + off, (int) (length - in.getStreamPosition()), true);
} else {
// => Keyframe or no Inflater Stream present. Create new one, and ensure
// that we can append new data to it later on.
if (byteArrayInputStream != null) {
byteArrayInputStream.setBuffer(inDat, (int) in.getStreamPosition() + off, (int) (length - in.getStreamPosition()));
} else {
byteArrayInputStream = new AppendableByteArrayInputStream(inDat.clone(), (int) in.getStreamPosition() + off, (int) (length - in.getStreamPosition()));
}
if (inflaterInputStream != null) {
inflaterInputStream.close();
}
inflaterInputStream = new InflaterInputStream(byteArrayInputStream);
}
in = new UncachedImageInputStream(inflaterInputStream, ByteOrder.LITTLE_ENDIAN);
break;
case COMPRESSION_NONE:
System.out.println(" NO COMPRESSION");
return isKeyframe;
default:
System.err.println("unsupported compression type " + compressionType);
return isKeyframe;
}
switch (videoFormat) {
case VIDEOMODE_8_BIT_PALETTIZED:
decode8to8(in, outDat, prevDat, flags, width, height);
break;
/*
case VIDEOMODE_15_BIT_BGR:
decode15BitBGR(in, outDat, prevDat, flags, width, height);
break;
case VIDEOMODE_16_BIT_BGR:
decode16BitBGR(in, outDat, prevDat, flags, width, height);
break;
case VIDEOMODE_32_BIT_BGR:
decode32BitBGR(in, outDat, prevDat, flags, width, height);
break;
* */
default:
throw new UnsupportedOperationException("Unsupported video format " + videoFormat);
}
} catch (IOException ex) {
//System.out.println("ZMBVCodecCore "+ex);
System.err.println("ZMBVCodecCore decoding, isKeyframe=" + isKeyframe);
ex.printStackTrace();
}
return isKeyframe;
}
/** Decodes to 8-bit, 15-bit, 16-bit or 32-bit RGB depending on input data.
* Returns the number of decoded bits.
* Returns a negative number if keyframe.
* Returns 0 in case of failure.
*/
public int decode(byte[] inDat, int off, int length, Object[] outDatHolder, Object[] prevDatHolder, int width, int height, boolean onlyDecodeIfKeyframe) {
boolean isKeyframe = false;
int depth = 0;
try {
ImageInputStream in = new ByteArrayImageInputStream(inDat, off, length, ByteOrder.LITTLE_ENDIAN);
int flags = in.readUnsignedByte();
isKeyframe = (flags & 1) != 0;
if (onlyDecodeIfKeyframe && !isKeyframe) {
System.err.println("ZMBVCodec cannot decode delta without preceeding keyframe.");
return 0;
}
if (isKeyframe) {
// => Key frame
//System.out.println("ZMBVCode Keyframe w,h=" + width + "," + height);
majorVersion = in.readUnsignedByte();
minorVersion = in.readUnsignedByte();
compressionType = in.readUnsignedByte();
videoFormat = in.readUnsignedByte();
blockWidth = in.readUnsignedByte();
blockHeight = in.readUnsignedByte();
}
if (majorVersion != 0 || minorVersion != 1) {
System.err.println("unsupported version " + majorVersion + "." + minorVersion);
return 0;
}
switch (compressionType) {
case COMPRESSION_ZLIB:
if (!isKeyframe && inflaterInputStream != null) {
// => streams are present.
// Append new data.
AppendableByteArrayInputStream bais = byteArrayInputStream;
bais.appendBuffer(inDat, (int) in.getStreamPosition() + off, (int) (length - in.getStreamPosition()), true);
} else {
// => Keyframe or no Inflater Stream present. Create new one, and ensure
// that we can append new data to it later on.
if (byteArrayInputStream != null) {
byteArrayInputStream.setBuffer(inDat, (int) in.getStreamPosition() + off, (int) (length - in.getStreamPosition()));
} else {
byteArrayInputStream = new AppendableByteArrayInputStream(inDat.clone(), (int) in.getStreamPosition() + off, (int) (length - in.getStreamPosition()));
}
if (inflaterInputStream != null) {
inflaterInputStream.close();
}
inflaterInputStream = new InflaterInputStream(byteArrayInputStream);
}
in = new UncachedImageInputStream(inflaterInputStream, ByteOrder.LITTLE_ENDIAN);
break;
case COMPRESSION_NONE:
System.err.println(" NO COMPRESSION");
return 0;
default:
System.err.println("unsupported compression type " + compressionType);
return 0;
}
switch (videoFormat) {
case VIDEOMODE_8_BIT_PALETTIZED:
depth = 8;
if (!(outDatHolder[0] instanceof byte[])) {
outDatHolder[0] = new byte[width * height];
}
if (!(prevDatHolder[0] instanceof byte[])) {
prevDatHolder[0] = new byte[width * height];
}
decode8to8(in, (byte[]) outDatHolder[0], (byte[]) prevDatHolder[0], flags, width, height);
break;
case VIDEOMODE_15_BIT_BGR:
depth = 15;
if (!(outDatHolder[0] instanceof short[])) {
outDatHolder[0] = new short[width * height];
}
if (!(prevDatHolder[0] instanceof short[])) {
prevDatHolder[0] = new short[width * height];
}
decode15to15(in, (short[]) outDatHolder[0], (short[]) prevDatHolder[0], flags, width, height);
break;
case VIDEOMODE_16_BIT_BGR:
depth = 16;
if (!(outDatHolder[0] instanceof short[])) {
outDatHolder[0] = new short[width * height];
}
if (!(prevDatHolder[0] instanceof short[])) {
prevDatHolder[0] = new short[width * height];
}
decode16to16(in, (short[]) outDatHolder[0], (short[]) prevDatHolder[0], flags, width, height);
break;
case VIDEOMODE_32_BIT_BGR:
depth = 32;
if (!(outDatHolder[0] instanceof int[])) {
outDatHolder[0] = new short[width * height];
}
if (!(prevDatHolder[0] instanceof int[])) {
prevDatHolder[0] = new short[width * height];
}
decode32to32(in, (int[]) outDatHolder[0], (int[]) prevDatHolder[0], flags, width, height);
break;
default:
throw new UnsupportedOperationException("Unsupported video format " + videoFormat);
}
} catch (IOException ex) {
//System.out.println("ZMBVCodecCore "+ex);
System.err.println("ZMBVCodecCore decoding, isKeyframe=" + isKeyframe);
ex.printStackTrace();
}
return isKeyframe ? -depth : depth;
}
private void decode8to32(ImageInputStream in, int[] outDat, int[] prevDat, int flags, int width, int height) throws IOException {
boolean isKeyframe = (flags & 1) != 0;
boolean isPaletteChange = (flags & 2) != 0;
// palette each entry contains a 32-bit entry constisting of:
// {palette index, red, green, blue}.
if (palette == null) {
palette = new int[256];
}
int blockSize = blockWidth * blockHeight;
if (blockDataBuf == null || blockDataBuf.length < max(3, blockSize)) {
blockDataBuf = new byte[max(3, blockSize)];
}
byte[] buf = blockDataBuf;
if (isKeyframe) {
// => Key frame.
// Read palette
for (int i = 0; i < 256; i++) {
in.readFully(buf, 0, 3);
palette[i] = ((buf[2] & 0xff)) | ((buf[1] & 0xff) << 8) | ((buf[0] & 0xff) << 16) | (i << 24);
}
// Process raw pixels
for (int i = 0, n = width * height; i < n; i++) {
outDat[i] = palette[in.readUnsignedByte()];
}
} else {
// => Delta frame.
// Optionally update palette
if (isPaletteChange) {
for (int i = 0; i < 256; i++) {
in.readFully(buf, 0, 3);
palette[i] ^= ((buf[2] & 0xff)) | ((buf[1] & 0xff) << 8) | ((buf[0] & 0xff) << 16);
}
}
// Read block headers
int nbx = (width + blockWidth - 1) / blockWidth;
int nby = (height + blockHeight - 1) / blockHeight;
int blockHeaderSize = ((nbx * nby * 2 + 3) & ~3);
if (blockHeaderBuf == null || blockHeaderBuf.length < blockHeaderSize) {
blockHeaderBuf = new byte[blockHeaderSize];
}
byte[] blocks = blockHeaderBuf;
in.readFully(blocks, 0, blockHeaderSize);
// Process block data
int block = 0;
for (int by = 0; by < height; by += blockHeight) {
int bh2 = min(height - by, blockHeight);
for (int bx = 0; bx < width; bx += blockWidth) {
int bw2 = min(width - bx, blockWidth);
int a = blocks[block++];
int b = blocks[block++];
int dx = a >> 1;
int dy = b >> 1;
int flag = a & 1;
if (flag == 0) {
// => copy block from offset dx,dy from previous frame
// motion vectors out of bounds are used to zero blocks.
for (int y = 0; y < bh2; y++) {
int py = by + y + dy;
int iout = bx + (by + y) * width;
if (py < 0 || height <= py) {
for (int x = 0; x < bw2; x++) {
outDat[iout++] = palette[0];
}
} else {
for (int x = 0; x < bw2; x++) {
int px = bx + x + dx;
if (0 <= px && px < width) {
outDat[iout++] = palette[prevDat[px + py * width] >>> 24];
} else {
outDat[iout++] = palette[0];
}
}
}
}
} else {
// => XOR block with data read from stream
in.readFully(buf, 0, bw2 * bh2);
int iblock = 0;
for (int y = 0; y < bh2; y++) {
int py = by + y + dy;
int iout = bx + (by + y) * width;
for (int x = 0; x < bw2; x++) {
int px = bx + x + dx;
int paletteIndex = buf[iblock++] & 0xff;
if (0 <= py && py < height && 0 <= px && px < width) {
paletteIndex ^= prevDat[px + py * width] >>> 24;
}
outDat[iout] = palette[paletteIndex];
iout++;
}
}
}
}
}
}
}
private void decode8to8(ImageInputStream in, byte[] outDat, byte[] prevDat, int flags, int width, int height) throws IOException {
boolean isKeyframe = (flags & 1) != 0;
boolean isPaletteChange = (flags & 2) != 0;
// palette each entry contains a 32-bit entry constisting of:
// {palette index, red, green, blue}.
if (palette == null) {
palette = new int[256];
}
int blockSize = blockWidth * blockHeight;
if (blockDataBuf == null || blockDataBuf.length < max(3, blockSize)) {
blockDataBuf = new byte[max(3, blockSize)];
}
byte[] buf = blockDataBuf;
if (isKeyframe) {
// => Key frame.
// Read palette
for (int i = 0; i < 256; i++) {
in.readFully(buf, 0, 3);
palette[i] = ((buf[2] & 0xff)) | ((buf[1] & 0xff) << 8) | ((buf[0] & 0xff) << 16) | (i << 24);
}
// Process raw pixels
for (int i = 0, n = width * height; i < n; i++) {
outDat[i] = in.readByte();
}
} else {
// => Delta frame.
// Optionally update palette
if (isPaletteChange) {
for (int i = 0; i < 256; i++) {
in.readFully(buf, 0, 3);
palette[i] ^= ((buf[2] & 0xff)) | ((buf[1] & 0xff) << 8) | ((buf[0] & 0xff) << 16);
}
}
// Read block headers
int nbx = (width + blockWidth - 1) / blockWidth;
int nby = (height + blockHeight - 1) / blockHeight;
int blockHeaderSize = ((nbx * nby * 2 + 3) & ~3);
if (blockHeaderBuf == null || blockHeaderBuf.length < blockHeaderSize) {
blockHeaderBuf = new byte[blockHeaderSize];
}
byte[] blocks = blockHeaderBuf;
in.readFully(blocks, 0, blockHeaderSize);
// Process block data
int block = 0;
for (int by = 0; by < height; by += blockHeight) {
int bh2 = min(height - by, blockHeight);
for (int bx = 0; bx < width; bx += blockWidth) {
int bw2 = min(width - bx, blockWidth);
int a = blocks[block++];
int b = blocks[block++];
int dx = a >> 1;
int dy = b >> 1;
int flag = a & 1;
if (flag == 0) {
// => copy block from offset dx,dy from previous frame
// motion vectors out of bounds are used to zero blocks.
for (int y = 0; y < bh2; y++) {
int py = by + y + dy;
int iout = bx + (by + y) * width;
if (py < 0 || height <= py) {
for (int x = 0; x < bw2; x++) {
outDat[iout++] = 0;
}
} else {
for (int x = 0; x < bw2; x++) {
int px = bx + x + dx;
if (0 <= px && px < width) {
outDat[iout++] = prevDat[px + py * width];
} else {
outDat[iout++] = 0;
}
}
}
}
} else {
// => XOR block with data read from stream
in.readFully(buf, 0, bw2 * bh2);
int iblock = 0;
for (int y = 0; y < bh2; y++) {
int py = by + y + dy;
int iout = bx + (by + y) * width;
for (int x = 0; x < bw2; x++) {
int px = bx + x + dx;
byte paletteIndex = buf[iblock++];
if (0 <= py && py < height && 0 <= px && px < width) {
paletteIndex ^= prevDat[px + py * width];
}
outDat[iout] = paletteIndex;
iout++;
}
}
}
}
}
}
}
private void decode15to32(ImageInputStream in, int[] outDat, int[] prevDat, int flags, int width, int height) throws IOException {
boolean isKeyframe = (flags & 1) != 0;
int blockSize = blockWidth * blockHeight;
if (blockDataBuf == null || blockDataBuf.length < max(3, blockSize * 2)) {
blockDataBuf = new byte[max(3, blockSize * 2)];
}
byte[] buf = blockDataBuf;
if (isKeyframe) {
// => Key frame.
// Process raw pixels
for (int i = 0, n = width * height; i < n; i++) {
int bgr = in.readUnsignedShort();
outDat[i] = ((bgr & (0x1f << 5)) << 6) | ((bgr & (0x1c << 5)) << 1)//green
| ((bgr & (0x1f << 10)) << 9) | ((bgr & (0x1c << 10)) << 4) // red
| ((bgr & (0x1f << 0)) << 3) | ((bgr & (0x1c << 0)) >>> 2) // blue
;
}
} else {
// => Delta frame.
// Read block headers
int nbx = (width + blockWidth - 1) / blockWidth;
int nby = (height + blockHeight - 1) / blockHeight;
int blockHeaderSize = ((nbx * nby * 2 + 3) & ~3);
//System.out.println("blockHeaderSize=" + blockHeaderSize + " blockSize x,y=" + blockWidth + "," + blockHeight);
if (blockHeaderBuf == null || blockHeaderBuf.length < blockHeaderSize) {
blockHeaderBuf = new byte[blockHeaderSize];
}
byte[] blocks = blockHeaderBuf;
in.readFully(blocks, 0, blockHeaderSize);
// Process block data
int block = 0;
for (int by = 0; by < height; by += blockHeight) {
int bh2 = min(height - by, blockHeight);
for (int bx = 0; bx < width; bx += blockWidth) {
int bw2 = min(width - bx, blockWidth);
int a = blocks[block++];
int b = blocks[block++];
int dx = a >> 1;
int dy = b >> 1;
int flag = a & 1;
if (flag == 0) {
// => copy block from offset dx,dy from previous frame
// motion vectors out of bounds are used to zero blocks.
for (int y = 0; y < bh2; y++) {
int py = by + y + dy;
int iout = bx + (by + y) * width;
if (py < 0 || height <= py) {
for (int x = 0; x < bw2; x++) {
outDat[iout++] = 0;
}
} else {
for (int x = 0; x < bw2; x++) {
int px = bx + x + dx;
if (0 <= px && px < width) {
outDat[iout++] = prevDat[px + py * width];
} else {
outDat[iout++] = 0;
}
}
}
}
} else {
// => XOR block with data read from stream
in.readFully(buf, 0, bw2 * bh2 * 2);
int iblock = 0;
for (int y = 0; y < bh2; y++) {
int py = by + y + dy;
int iout = bx + (by + y) * width;
for (int x = 0; x < bw2; x++) {
int px = bx + x + dx;
int bgr = ((buf[iblock++] & 0xff)) | ((buf[iblock++] & 0xff) << 8);
int rgb = ((bgr & (0x1f << 5)) << 6) | ((bgr & (0x1c << 5)) << 1)//green
| ((bgr & (0x1f << 10)) << 9) | ((bgr & (0x1c << 10)) << 4) // red
| ((bgr & (0x1f << 0)) << 3) | ((bgr & (0x1c << 0)) >>> 2) // blue
;
if (0 <= py && py < height && 0 <= px && px < width) {
rgb ^= prevDat[px + py * width];
}
outDat[iout] = rgb;
iout++;
}
}
}
}
}
}
}
private void decode15to15(ImageInputStream in, short[] outDat, short[] prevDat, int flags, int width, int height) throws IOException {
boolean isKeyframe = (flags & 1) != 0;
int blockSize = blockWidth * blockHeight;
if (blockDataBuf == null || blockDataBuf.length < max(3, blockSize * 2)) {
blockDataBuf = new byte[max(3, blockSize * 2)];
}
byte[] buf = blockDataBuf;
if (isKeyframe) {
// => Key frame.
// Process raw pixels
for (int i = 0, n = width * height; i < n; i++) {
int bgr = in.readUnsignedShort();
outDat[i] = (short) bgr;
}
} else {
// => Delta frame.
// Read block headers
int nbx = (width + blockWidth - 1) / blockWidth;
int nby = (height + blockHeight - 1) / blockHeight;
int blockHeaderSize = ((nbx * nby * 2 + 3) & ~3);
//System.out.println("blockHeaderSize=" + blockHeaderSize + " blockSize x,y=" + blockWidth + "," + blockHeight);
if (blockHeaderBuf == null || blockHeaderBuf.length < blockHeaderSize) {
blockHeaderBuf = new byte[blockHeaderSize];
}
byte[] blocks = blockHeaderBuf;
in.readFully(blocks, 0, blockHeaderSize);
// Process block data
int block = 0;
for (int by = 0; by < height; by += blockHeight) {
int bh2 = min(height - by, blockHeight);
for (int bx = 0; bx < width; bx += blockWidth) {
int bw2 = min(width - bx, blockWidth);
int a = blocks[block++];
int b = blocks[block++];
int dx = a >> 1;
int dy = b >> 1;
int flag = a & 1;
if (flag == 0) {
// => copy block from offset dx,dy from previous frame
// motion vectors out of bounds are used to zero blocks.
for (int y = 0; y < bh2; y++) {
int py = by + y + dy;
int iout = bx + (by + y) * width;
if (py < 0 || height <= py) {
for (int x = 0; x < bw2; x++) {
outDat[iout++] = 0;
}
} else {
for (int x = 0; x < bw2; x++) {
int px = bx + x + dx;
if (0 <= px && px < width) {
outDat[iout++] = prevDat[px + py * width];
} else {
outDat[iout++] = 0;
}
}
}
}
} else {
// => XOR block with data read from stream
in.readFully(buf, 0, bw2 * bh2 * 2);
int iblock = 0;
for (int y = 0; y < bh2; y++) {
int py = by + y + dy;
int iout = bx + (by + y) * width;
for (int x = 0; x < bw2; x++) {
int px = bx + x + dx;
int bgr = ((buf[iblock++] & 0xff)) | ((buf[iblock++] & 0xff) << 8);
if (0 <= py && py < height && 0 <= px && px < width) {
bgr ^= prevDat[px + py * width];
}
outDat[iout] = (short) bgr;
iout++;
}
}
}
}
}
}
}
private void decode16to32(ImageInputStream in, int[] outDat, int[] prevDat, int flags, int width, int height) throws IOException {
boolean isKeyframe = (flags & 1) != 0;
int blockSize = blockWidth * blockHeight;
if (blockDataBuf == null || blockDataBuf.length < max(3, blockSize * 2)) {
blockDataBuf = new byte[max(3, blockSize * 2)];
}
byte[] buf = blockDataBuf;
if (isKeyframe) {
// => Key frame.
// Process raw pixels
for (int i = 0, n = width * height; i < n; i++) {
int bgr = in.readUnsignedShort();
outDat[i] = ((bgr & (0x3f << 5)) << 5) | ((bgr & (0x30 << 5)) >> 1)//green
| ((bgr & (0x1f << 11)) << 8) | ((bgr & (0x1c << 11)) << 3) // red
| ((bgr & (0x1f << 0)) << 3) | ((bgr & (0x1c << 0)) >>> 2) // blue
;
}
} else {
// => Delta frame.
// Read block headers
int nbx = (width + blockWidth - 1) / blockWidth;
int nby = (height + blockHeight - 1) / blockHeight;
int blockHeaderSize = ((nbx * nby * 2 + 3) & ~3);
if (blockHeaderBuf == null || blockHeaderBuf.length < blockHeaderSize) {
blockHeaderBuf = new byte[blockHeaderSize];
}
byte[] blocks = blockHeaderBuf;
in.readFully(blocks, 0, blockHeaderSize);
// Process block data
int block = 0;
for (int by = 0; by < height; by += blockHeight) {
int bh2 = min(height - by, blockHeight);
for (int bx = 0; bx < width; bx += blockWidth) {
int bw2 = min(width - bx, blockWidth);
int a = blocks[block++];
int b = blocks[block++];
int dx = a >> 1;
int dy = b >> 1;
int flag = a & 1;
if (flag == 0) {
// => copy block from offset dx,dy from previous frame
for (int y = 0; y < bh2; y++) {
int py = by + y + dy;
int iout = bx + (by + y) * width;
for (int x = 0; x < bw2; x++) {
int px = bx + x + dx;
if (0 <= py && py < height && 0 <= px && px < width) {
outDat[iout] = prevDat[px + py * width];
} else {
outDat[iout] = 0;
}
iout++;
}
}
} else {
// => XOR block with data read from stream
in.readFully(buf, 0, bw2 * bh2 * 2);
int iblock = 0;
for (int y = 0; y < bh2; y++) {
int py = by + y + dy;
int iout = bx + (by + y) * width;
for (int x = 0; x < bw2; x++) {
int px = bx + x + dx;
int bgr = ((buf[iblock++] & 0xff)) | ((buf[iblock++] & 0xff) << 8);
int rgb = ((bgr & (0x3f << 5)) << 5) | ((bgr & (0x30 << 5)) >> 1)//green
| ((bgr & (0x1f << 11)) << 8) | ((bgr & (0x1c << 11)) << 3) // red
| ((bgr & (0x1f << 0)) << 3) | ((bgr & (0x1c << 0)) >>> 2) // blue
;
if (0 <= py && py < height && 0 <= px && px < width) {
rgb ^= prevDat[px + py * width];
}
outDat[iout] = (short) bgr;
iout++;
}
}
}
}
}
}
}
private void decode16to16(ImageInputStream in, short[] outDat, short[] prevDat, int flags, int width, int height) throws IOException {
boolean isKeyframe = (flags & 1) != 0;
int blockSize = blockWidth * blockHeight;
if (blockDataBuf == null || blockDataBuf.length < max(3, blockSize * 2)) {
blockDataBuf = new byte[max(3, blockSize * 2)];
}
byte[] buf = blockDataBuf;
if (isKeyframe) {
// => Key frame.
// Process raw pixels
for (int i = 0, n = width * height; i < n; i++) {
int bgr = in.readUnsignedShort();
outDat[i] = (short) bgr;
}
} else {
// => Delta frame.
// Read block headers
int nbx = (width + blockWidth - 1) / blockWidth;
int nby = (height + blockHeight - 1) / blockHeight;
int blockHeaderSize = ((nbx * nby * 2 + 3) & ~3);
if (blockHeaderBuf == null || blockHeaderBuf.length < blockHeaderSize) {
blockHeaderBuf = new byte[blockHeaderSize];
}
byte[] blocks = blockHeaderBuf;
in.readFully(blocks, 0, blockHeaderSize);
// Process block data
int block = 0;
for (int by = 0; by < height; by += blockHeight) {
int bh2 = min(height - by, blockHeight);
for (int bx = 0; bx < width; bx += blockWidth) {
int bw2 = min(width - bx, blockWidth);
int a = blocks[block++];
int b = blocks[block++];
int dx = a >> 1;
int dy = b >> 1;
int flag = a & 1;
if (flag == 0) {
// => copy block from offset dx,dy from previous frame
for (int y = 0; y < bh2; y++) {
int py = by + y + dy;
int iout = bx + (by + y) * width;
for (int x = 0; x < bw2; x++) {
int px = bx + x + dx;
if (0 <= py && py < height && 0 <= px && px < width) {
outDat[iout] = prevDat[px + py * width];
} else {
outDat[iout] = 0;
}
iout++;
}
}
} else {
// => XOR block with data read from stream
in.readFully(buf, 0, bw2 * bh2 * 2);
int iblock = 0;
for (int y = 0; y < bh2; y++) {
int py = by + y + dy;
int iout = bx + (by + y) * width;
for (int x = 0; x < bw2; x++) {
int px = bx + x + dx;
int bgr = ((buf[iblock++] & 0xff)) | ((buf[iblock++] & 0xff) << 8);
if (0 <= py && py < height && 0 <= px && px < width) {
bgr ^= prevDat[px + py * width];
}
outDat[iout] = (short) bgr;
iout++;
}
}
}
}
}
}
}
private void decode32to32(ImageInputStream in, int[] outDat, int[] prevDat, int flags, int width, int height) throws IOException {
boolean isKeyframe = (flags & 1) != 0;
int blockSize = blockWidth * blockHeight;
if (blockDataBuf == null || blockDataBuf.length < max(3, blockSize * 4)) {
blockDataBuf = new byte[max(3, blockSize * 4)];
}
byte[] buf = blockDataBuf;
if (isKeyframe) {
// => Key frame.
// Process raw pixels
for (int i = 0, n = width * height; i < n; i++) {
int bgr = in.readInt();
outDat[i] = bgr;
/*((bgr & (0x3f << 5))<<5)| ((bgr & (0x30 << 5)) >>1)//green
|((bgr & (0x1f << 11)) << 8) | ((bgr & (0x1c << 11)) << 3) // red
|((bgr & (0x1f << 0)) << 3) | ((bgr & (0x1c << 0)) >>> 2) // blue
; */
}
} else {
// => Delta frame.
// Read block headers
int nbx = (width + blockWidth - 1) / blockWidth;
int nby = (height + blockHeight - 1) / blockHeight;
int blockHeaderSize = ((nbx * nby * 2 + 3) & ~3);
if (blockHeaderBuf == null || blockHeaderBuf.length < blockHeaderSize) {
blockHeaderBuf = new byte[blockHeaderSize];
}
byte[] blocks = blockHeaderBuf;
in.readFully(blocks, 0, blockHeaderSize);
// Process block data
int block = 0;
for (int by = 0; by < height; by += blockHeight) {
int bh2 = min(height - by, blockHeight);
for (int bx = 0; bx < width; bx += blockWidth) {
int bw2 = min(width - bx, blockWidth);
int a = blocks[block++];
int b = blocks[block++];
int dx = a >> 1;
int dy = b >> 1;
int flag = a & 1;
if (flag == 0) {
// => copy block from offset dx,dy from previous frame
for (int y = 0; y < bh2; y++) {
int py = by + y + dy;
int iout = bx + (by + y) * width;
for (int x = 0; x < bw2; x++) {
int px = bx + x + dx;
int rgb;
if (0 <= py && py < height && 0 <= px && px < width) {
rgb = prevDat[px + py * width];
} else {
rgb = 0;
}
outDat[iout] = rgb;
iout++;
}
}
} else {
// => XOR block with data read from stream
in.readFully(buf, 0, bw2 * bh2 * 4);
int iblock = 0;
for (int y = 0; y < bh2; y++) {
int py = by + y + dy;
int iout = bx + (by + y) * width;
for (int x = 0; x < bw2; x++) {
int px = bx + x + dx;
int bgr = ((buf[iblock] & 0xff)) | ((buf[iblock + 1] & 0xff) << 8) | ((buf[iblock + 2] & 0xff) << 16) | ((buf[iblock + 3] & 0xff) << 24);
iblock += 4;
int rgb = bgr;
/*((bgr & (0x3f << 5))<<5)| ((bgr & (0x30 << 5)) >>1)//green
|((bgr & (0x1f << 11)) << 8) | ((bgr & (0x1c << 11)) << 3) // red
|((bgr & (0x1f << 0)) << 3) | ((bgr & (0x1c << 0)) >>> 2) // blue
; */
if (0 <= py && py < height && 0 <= px && px < width) {
rgb ^= prevDat[px + py * width];
}
outDat[iout] = rgb;
iout++;
}
}
}
}
}
}
}
public int[] getPalette() {
if (palette == null) {
palette = new int[256];
// initalize palette with grayscale colors
for (int i = 0; i < palette.length; i++) {
palette[i] = (i) | (i << 8) | (i << 16);
}
}
return palette;
}
}
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