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diff --git a/video/codecs/truemotion1.cpp b/video/codecs/truemotion1.cpp
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-/* ScummVM - Graphic Adventure Engine
- *
- * ScummVM is the legal property of its developers, whose names
- * are too numerous to list here. Please refer to the COPYRIGHT
- * file distributed with this source distribution.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
-
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
-
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- *
- */
-
-// Based on the TrueMotion 1 decoder by Alex Beregszaszi & Mike Melanson in FFmpeg
-
-#include "common/scummsys.h"
-#include "video/codecs/truemotion1.h"
-
-#ifdef VIDEO_CODECS_TRUEMOTION1_H
-
-#include "video/codecs/truemotion1data.h"
-#include "common/stream.h"
-#include "common/textconsole.h"
-#include "common/util.h"
-
-namespace Video {
-
-enum {
- FLAG_SPRITE = (1 << 5),
- FLAG_KEYFRAME = (1 << 4),
- FLAG_INTERFRAME = (1 << 3),
- FLAG_INTERPOLATED = (1 << 2)
-};
-
-enum {
- ALGO_NOP = 0,
- ALGO_RGB16V = 1,
- ALGO_RGB16H = 2,
- ALGO_RGB24H = 3
-};
-
-// these are the various block sizes that can occupy a 4x4 block
-enum {
- BLOCK_2x2 = 0,
- BLOCK_2x4 = 1,
- BLOCK_4x2 = 2,
- BLOCK_4x4 = 3
-};
-
-// { valid for metatype }, algorithm, num of deltas, vert res, horiz res
-struct CompressionType {
- int algorithm;
- int blockWidth; // vres
- int blockHeight; // hres
- int blockType;
-};
-
-static const CompressionType compressionTypes[17] = {
- { ALGO_NOP, 0, 0, 0 },
-
- { ALGO_RGB16V, 4, 4, BLOCK_4x4 },
- { ALGO_RGB16H, 4, 4, BLOCK_4x4 },
- { ALGO_RGB16V, 4, 2, BLOCK_4x2 },
- { ALGO_RGB16H, 4, 2, BLOCK_4x2 },
-
- { ALGO_RGB16V, 2, 4, BLOCK_2x4 },
- { ALGO_RGB16H, 2, 4, BLOCK_2x4 },
- { ALGO_RGB16V, 2, 2, BLOCK_2x2 },
- { ALGO_RGB16H, 2, 2, BLOCK_2x2 },
-
- { ALGO_NOP, 4, 4, BLOCK_4x4 },
- { ALGO_RGB24H, 4, 4, BLOCK_4x4 },
- { ALGO_NOP, 4, 2, BLOCK_4x2 },
- { ALGO_RGB24H, 4, 2, BLOCK_4x2 },
-
- { ALGO_NOP, 2, 4, BLOCK_2x4 },
- { ALGO_RGB24H, 2, 4, BLOCK_2x4 },
- { ALGO_NOP, 2, 2, BLOCK_2x2 },
- { ALGO_RGB24H, 2, 2, BLOCK_2x2 }
-};
-
-TrueMotion1Decoder::TrueMotion1Decoder(uint16 width, uint16 height) {
- _surface = new Graphics::Surface();
- _width = width;
- _height = height;
-
- _surface->create(width, height, getPixelFormat());
-
- // there is a vertical predictor for each pixel in a line; each vertical
- // predictor is 0 to start with
- _vertPred = new uint32[_width];
-
- _buf = _mbChangeBits = _indexStream = 0;
- _lastDeltaset = _lastVectable = -1;
-}
-
-TrueMotion1Decoder::~TrueMotion1Decoder() {
- _surface->free();
- delete _surface;
- delete[] _vertPred;
-}
-
-void TrueMotion1Decoder::selectDeltaTables(int deltaTableIndex) {
- if (deltaTableIndex > 3)
- return;
-
- for (byte i = 0; i < 8; i++) {
- _ydt[i] = ydts[deltaTableIndex][i];
- _cdt[i] = cdts[deltaTableIndex][i];
-
- // Y skinny deltas need to be halved for some reason; maybe the
- // skinny Y deltas should be modified
- // Drop the lsb before dividing by 2-- net effect: round down
- // when dividing a negative number (e.g., -3/2 = -2, not -1)
- _ydt[i] &= 0xFFFE;
- _ydt[i] /= 2;
- }
-}
-
-int TrueMotion1Decoder::makeYdt16Entry(int p1, int p2) {
-#ifdef SCUMM_BIG_ENDIAN
- // Swap the values on BE systems. FFmpeg does this too.
- SWAP<int>(p1, p2);
-#endif
-
- int lo = _ydt[p1];
- lo += (lo << 6) + (lo << 11);
- int hi = _ydt[p2];
- hi += (hi << 6) + (hi << 11);
- return lo + (hi << 16);
-}
-
-int TrueMotion1Decoder::makeCdt16Entry(int p1, int p2) {
- int b = _cdt[p2];
- int r = _cdt[p1] << 11;
- int lo = b + r;
- return lo + (lo << 16);
-}
-
-void TrueMotion1Decoder::genVectorTable16(const byte *selVectorTable) {
- memset(&_yPredictorTable, 0, sizeof(PredictorTableEntry) * 1024);
- memset(&_cPredictorTable, 0, sizeof(PredictorTableEntry) * 1024);
-
- for (int i = 0; i < 1024; i += 4) {
- int len = *selVectorTable++ / 2;
- for (int j = 0; j < len; j++) {
- byte deltaPair = *selVectorTable++;
- _yPredictorTable[i + j].color = makeYdt16Entry(deltaPair >> 4, deltaPair & 0xf);
- _cPredictorTable[i + j].color = makeCdt16Entry(deltaPair >> 4, deltaPair & 0xf);
- }
-
- _yPredictorTable[i + (len - 1)].getNextIndex = true;
- _cPredictorTable[i + (len - 1)].getNextIndex = true;
- }
-}
-
-void TrueMotion1Decoder::decodeHeader(Common::SeekableReadStream *stream) {
- _buf = new byte[stream->size()];
- stream->read(_buf, stream->size());
-
- byte headerBuffer[128]; // logical maximum size of the header
- const byte *selVectorTable;
-
- // There is 1 change bit per 4 pixels, so each change byte represents
- // 32 pixels; divide width by 4 to obtain the number of change bits and
- // then round up to the nearest byte.
- _mbChangeBitsRowSize = ((_width >> 2) + 7) >> 3;
-
- _header.headerSize = ((_buf[0] >> 5) | (_buf[0] << 3)) & 0x7f;
-
- if (_buf[0] < 0x10)
- error("Invalid TrueMotion1 header size %d", _header.headerSize);
-
- // unscramble the header bytes with a XOR operation
- memset(headerBuffer, 0, 128);
- for (int i = 1; i < _header.headerSize; i++)
- headerBuffer[i - 1] = _buf[i] ^ _buf[i + 1];
-
- _header.compression = headerBuffer[0];
- _header.deltaset = headerBuffer[1];
- _header.vectable = headerBuffer[2];
- _header.ysize = READ_LE_UINT16(&headerBuffer[3]);
- _header.xsize = READ_LE_UINT16(&headerBuffer[5]);
- _header.checksum = READ_LE_UINT16(&headerBuffer[7]);
- _header.version = headerBuffer[9];
- _header.headerType = headerBuffer[10];
- _header.flags = headerBuffer[11];
- _header.control = headerBuffer[12];
-
- // Version 2
- if (_header.version >= 2) {
- if (_header.headerType > 3) {
- error("Invalid header type %d", _header.headerType);
- } else if (_header.headerType == 2 || _header.headerType == 3) {
- _flags = _header.flags;
- if (!(_flags & FLAG_INTERFRAME))
- _flags |= FLAG_KEYFRAME;
- } else
- _flags = FLAG_KEYFRAME;
- } else // Version 1
- _flags = FLAG_KEYFRAME;
-
- if (_flags & FLAG_SPRITE) {
- error("SPRITE frame found, please report the sample to the developers");
- } else if (_header.headerType < 2 && _header.xsize < 213 && _header.ysize >= 176) {
- _flags |= FLAG_INTERPOLATED;
- error("INTERPOLATION selected, please report the sample to the developers");
- }
-
- if (_header.compression >= 17)
- error("Invalid TrueMotion1 compression type %d", _header.compression);
-
- if (_header.deltaset != _lastDeltaset || _header.vectable != _lastVectable)
- selectDeltaTables(_header.deltaset);
-
- if ((_header.compression & 1) && _header.headerType)
- selVectorTable = pc_tbl2;
- else if (_header.vectable < 4)
- selVectorTable = tables[_header.vectable - 1];
- else
- error("Invalid vector table id %d", _header.vectable);
-
- if (_header.deltaset != _lastDeltaset || _header.vectable != _lastVectable)
- genVectorTable16(selVectorTable);
-
- // set up pointers to the other key data chunks
- _mbChangeBits = _buf + _header.headerSize;
-
- if (_flags & FLAG_KEYFRAME) {
- // no change bits specified for a keyframe; only index bytes
- _indexStream = _mbChangeBits;
- } else {
- // one change bit per 4x4 block
- _indexStream = _mbChangeBits + _mbChangeBitsRowSize * (_height >> 2);
- }
-
- _indexStreamSize = stream->size() - (_indexStream - _buf);
-
- _lastDeltaset = _header.deltaset;
- _lastVectable = _header.vectable;
- _blockWidth = compressionTypes[_header.compression].blockWidth;
- _blockHeight = compressionTypes[_header.compression].blockHeight;
- _blockType = compressionTypes[_header.compression].blockType;
-}
-
-#define GET_NEXT_INDEX() \
-do { \
- if (indexStreamIndex >= _indexStreamSize) \
- error("TrueMotion1 decoder went out of bounds"); \
- index = _indexStream[indexStreamIndex++] * 4; \
-} while (0) \
-
-#define APPLY_C_PREDICTOR() \
- predictor_pair = _cPredictorTable[index].color; \
- horizPred += predictor_pair; \
- if (_cPredictorTable[index].getNextIndex) { \
- GET_NEXT_INDEX(); \
- if (!index) { \
- GET_NEXT_INDEX(); \
- predictor_pair = _cPredictorTable[index].color; \
- horizPred += predictor_pair * 5; \
- if (_cPredictorTable[index].getNextIndex) \
- GET_NEXT_INDEX(); \
- else \
- index++; \
- } \
- } else \
- index++
-
-#define APPLY_Y_PREDICTOR() \
- predictor_pair = _yPredictorTable[index].color; \
- horizPred += predictor_pair; \
- if (_yPredictorTable[index].getNextIndex) { \
- GET_NEXT_INDEX(); \
- if (!index) { \
- GET_NEXT_INDEX(); \
- predictor_pair = _yPredictorTable[index].color; \
- horizPred += predictor_pair * 5; \
- if (_yPredictorTable[index].getNextIndex) \
- GET_NEXT_INDEX(); \
- else \
- index++; \
- } \
- } else \
- index++
-
-#define OUTPUT_PIXEL_PAIR() \
- *currentPixelPair = *vertPred + horizPred; \
- *vertPred++ = *currentPixelPair++
-
-void TrueMotion1Decoder::decode16() {
- uint32 predictor_pair;
- bool keyframe = _flags & FLAG_KEYFRAME;
- int indexStreamIndex = 0;
-
- // these variables are for managing the main index stream
- int index;
-
- // clean out the line buffer
- memset(_vertPred, 0, _width * 4);
-
- GET_NEXT_INDEX();
-
- for (int y = 0; y < _height; y++) {
- // re-init variables for the next line iteration
- uint32 horizPred = 0;
- uint32 *currentPixelPair = (uint32 *)_surface->getBasePtr(0, y);
- uint32 *vertPred = _vertPred;
- int mbChangeIndex = 0;
- byte mbChangeByte = _mbChangeBits[mbChangeIndex++];
- byte mbChangeByteMask = 1;
-
- for (int pixelsLeft = _width; pixelsLeft > 0; pixelsLeft -= 4) {
- if (keyframe || (mbChangeByte & mbChangeByteMask) == 0) {
- switch (y & 3) {
- case 0:
- // if macroblock width is 2, apply C-Y-C-Y; else
- // apply C-Y-Y
- if (_blockWidth == 2) {
- APPLY_C_PREDICTOR();
- APPLY_Y_PREDICTOR();
- OUTPUT_PIXEL_PAIR();
- APPLY_C_PREDICTOR();
- APPLY_Y_PREDICTOR();
- OUTPUT_PIXEL_PAIR();
- } else {
- APPLY_C_PREDICTOR();
- APPLY_Y_PREDICTOR();
- OUTPUT_PIXEL_PAIR();
- APPLY_Y_PREDICTOR();
- OUTPUT_PIXEL_PAIR();
- }
- break;
- case 1:
- case 3:
- // always apply 2 Y predictors on these iterations
- APPLY_Y_PREDICTOR();
- OUTPUT_PIXEL_PAIR();
- APPLY_Y_PREDICTOR();
- OUTPUT_PIXEL_PAIR();
- break;
- case 2:
- // this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
- // depending on the macroblock type
- if (_blockType == BLOCK_2x2) {
- APPLY_C_PREDICTOR();
- APPLY_Y_PREDICTOR();
- OUTPUT_PIXEL_PAIR();
- APPLY_C_PREDICTOR();
- APPLY_Y_PREDICTOR();
- OUTPUT_PIXEL_PAIR();
- } else if (_blockType == BLOCK_4x2) {
- APPLY_C_PREDICTOR();
- APPLY_Y_PREDICTOR();
- OUTPUT_PIXEL_PAIR();
- APPLY_Y_PREDICTOR();
- OUTPUT_PIXEL_PAIR();
- } else {
- APPLY_Y_PREDICTOR();
- OUTPUT_PIXEL_PAIR();
- APPLY_Y_PREDICTOR();
- OUTPUT_PIXEL_PAIR();
- }
- break;
- }
- } else {
- // skip (copy) four pixels, but reassign the horizontal
- // predictor
- *vertPred++ = *currentPixelPair++;
- horizPred = *currentPixelPair - *vertPred;
- *vertPred++ = *currentPixelPair++;
- }
-
- if (!keyframe) {
- mbChangeByteMask <<= 1;
-
- // next byte
- if (!mbChangeByteMask) {
- mbChangeByte = _mbChangeBits[mbChangeIndex++];
- mbChangeByteMask = 1;
- }
- }
- }
-
- // next change row
- if (((y + 1) & 3) == 0)
- _mbChangeBits += _mbChangeBitsRowSize;
- }
-}
-
-const Graphics::Surface *TrueMotion1Decoder::decodeImage(Common::SeekableReadStream *stream) {
- decodeHeader(stream);
-
- if (compressionTypes[_header.compression].algorithm == ALGO_NOP) {
- delete[] _buf;
- return 0;
- }
-
- if (compressionTypes[_header.compression].algorithm == ALGO_RGB24H) {
- warning("Unhandled TrueMotion1 24bpp frame");
- delete[] _buf;
- return 0;
- } else
- decode16();
-
- delete[] _buf;
-
- return _surface;
-}
-
-} // End of namespace Video
-
-#endif
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