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-rw-r--r--video/codecs/cinepak.cpp292
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diff --git a/video/codecs/cinepak.cpp b/video/codecs/cinepak.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.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#include "graphics/video/codecs/cinepak.h"
+
+#include "common/system.h"
+
+// Code here partially based off of ffmpeg ;)
+
+namespace Graphics {
+
+// Convert a color from YUV to RGB colorspace, Cinepak style.
+inline static void CPYUV2RGB(byte y, byte u, byte v, byte &r, byte &g, byte &b) {
+ r = CLIP<int>(y + 2 * (v - 128), 0, 255);
+ g = CLIP<int>(y - (u - 128) / 2 - (v - 128), 0, 255);
+ b = CLIP<int>(y + 2 * (u - 128), 0, 255);
+}
+
+#define PUT_PIXEL(offset, lum, u, v) \
+ if (_pixelFormat.bytesPerPixel != 1) { \
+ CPYUV2RGB(lum, u, v, r, g, b); \
+ if (_pixelFormat.bytesPerPixel == 2) \
+ *((uint16 *)_curFrame.surface->pixels + offset) = _pixelFormat.RGBToColor(r, g, b); \
+ else \
+ *((uint32 *)_curFrame.surface->pixels + offset) = _pixelFormat.RGBToColor(r, g, b); \
+ } else \
+ *((byte *)_curFrame.surface->pixels + offset) = lum
+
+CinepakDecoder::CinepakDecoder(int bitsPerPixel) : Codec() {
+ _curFrame.surface = NULL;
+ _curFrame.strips = NULL;
+ _y = 0;
+
+ if (bitsPerPixel == 8)
+ _pixelFormat = PixelFormat::createFormatCLUT8();
+ else
+ _pixelFormat = g_system->getScreenFormat();
+}
+
+CinepakDecoder::~CinepakDecoder() {
+ if (_curFrame.surface) {
+ _curFrame.surface->free();
+ delete _curFrame.surface;
+ }
+
+ delete[] _curFrame.strips;
+}
+
+const Surface *CinepakDecoder::decodeImage(Common::SeekableReadStream *stream) {
+ _curFrame.flags = stream->readByte();
+ _curFrame.length = (stream->readByte() << 16) + stream->readUint16BE();
+ _curFrame.width = stream->readUint16BE();
+ _curFrame.height = stream->readUint16BE();
+ _curFrame.stripCount = stream->readUint16BE();
+
+ if (_curFrame.strips == NULL)
+ _curFrame.strips = new CinepakStrip[_curFrame.stripCount];
+
+ debug (4, "Cinepak Frame: Width = %d, Height = %d, Strip Count = %d", _curFrame.width, _curFrame.height, _curFrame.stripCount);
+
+ // Borrowed from FFMPEG. This should cut out the extra data Cinepak for Sega has (which is useless).
+ // The theory behind this is that this is here to confuse standard Cinepak decoders. But, we won't let that happen! ;)
+ if (_curFrame.length != (uint32)stream->size()) {
+ if (stream->readUint16BE() == 0xFE00)
+ stream->readUint32BE();
+ }
+
+ if (!_curFrame.surface) {
+ _curFrame.surface = new Surface();
+ _curFrame.surface->create(_curFrame.width, _curFrame.height, _pixelFormat.bytesPerPixel);
+ }
+
+ // Reset the y variable.
+ _y = 0;
+
+ for (uint16 i = 0; i < _curFrame.stripCount; i++) {
+ if (i > 0 && !(_curFrame.flags & 1)) { // Use codebooks from last strip
+ for (uint16 j = 0; j < 256; j++) {
+ _curFrame.strips[i].v1_codebook[j] = _curFrame.strips[i - 1].v1_codebook[j];
+ _curFrame.strips[i].v4_codebook[j] = _curFrame.strips[i - 1].v4_codebook[j];
+ }
+ }
+
+ _curFrame.strips[i].id = stream->readUint16BE();
+ _curFrame.strips[i].length = stream->readUint16BE() - 12; // Subtract the 12 byte header
+ _curFrame.strips[i].rect.top = _y; stream->readUint16BE(); // Ignore, substitute with our own.
+ _curFrame.strips[i].rect.left = 0; stream->readUint16BE(); // Ignore, substitute with our own
+ _curFrame.strips[i].rect.bottom = _y + stream->readUint16BE();
+ _curFrame.strips[i].rect.right = _curFrame.width; stream->readUint16BE(); // Ignore, substitute with our own
+
+ // Sanity check. Because Cinepak is based on 4x4 blocks, the width and height of each strip needs to be divisible by 4.
+ assert(!(_curFrame.strips[i].rect.width() % 4) && !(_curFrame.strips[i].rect.height() % 4));
+
+ uint32 pos = stream->pos();
+
+ while ((uint32)stream->pos() < (pos + _curFrame.strips[i].length) && !stream->eos()) {
+ byte chunkID = stream->readByte();
+
+ if (stream->eos())
+ break;
+
+ // Chunk Size is 24-bit, ignore the first 4 bytes
+ uint32 chunkSize = stream->readByte() << 16;
+ chunkSize += stream->readUint16BE() - 4;
+
+ int32 startPos = stream->pos();
+
+ switch (chunkID) {
+ case 0x20:
+ case 0x21:
+ case 0x24:
+ case 0x25:
+ loadCodebook(stream, i, 4, chunkID, chunkSize);
+ break;
+ case 0x22:
+ case 0x23:
+ case 0x26:
+ case 0x27:
+ loadCodebook(stream, i, 1, chunkID, chunkSize);
+ break;
+ case 0x30:
+ case 0x31:
+ case 0x32:
+ decodeVectors(stream, i, chunkID, chunkSize);
+ break;
+ default:
+ warning("Unknown Cinepak chunk ID %02x", chunkID);
+ return _curFrame.surface;
+ }
+
+ if (stream->pos() != startPos + (int32)chunkSize)
+ stream->seek(startPos + chunkSize);
+ }
+
+ _y = _curFrame.strips[i].rect.bottom;
+ }
+
+ return _curFrame.surface;
+}
+
+void CinepakDecoder::loadCodebook(Common::SeekableReadStream *stream, uint16 strip, byte codebookType, byte chunkID, uint32 chunkSize) {
+ CinepakCodebook *codebook = (codebookType == 1) ? _curFrame.strips[strip].v1_codebook : _curFrame.strips[strip].v4_codebook;
+
+ int32 startPos = stream->pos();
+ uint32 flag = 0, mask = 0;
+
+ for (uint16 i = 0; i < 256; i++) {
+ if ((chunkID & 0x01) && !(mask >>= 1)) {
+ if ((stream->pos() - startPos + 4) > (int32)chunkSize)
+ break;
+
+ flag = stream->readUint32BE();
+ mask = 0x80000000;
+ }
+
+ if (!(chunkID & 0x01) || (flag & mask)) {
+ byte n = (chunkID & 0x04) ? 4 : 6;
+ if ((stream->pos() - startPos + n) > (int32)chunkSize)
+ break;
+
+ for (byte j = 0; j < 4; j++)
+ codebook[i].y[j] = stream->readByte();
+
+ if (n == 6) {
+ codebook[i].u = stream->readByte() + 128;
+ codebook[i].v = stream->readByte() + 128;
+ } else {
+ // This codebook type indicates either greyscale or
+ // palettized video. For greyscale, default us to
+ // 128 for both u and v.
+ codebook[i].u = 128;
+ codebook[i].v = 128;
+ }
+ }
+ }
+}
+
+void CinepakDecoder::decodeVectors(Common::SeekableReadStream *stream, uint16 strip, byte chunkID, uint32 chunkSize) {
+ uint32 flag = 0, mask = 0;
+ uint32 iy[4];
+ int32 startPos = stream->pos();
+ byte r = 0, g = 0, b = 0;
+
+ for (uint16 y = _curFrame.strips[strip].rect.top; y < _curFrame.strips[strip].rect.bottom; y += 4) {
+ iy[0] = _curFrame.strips[strip].rect.left + y * _curFrame.width;
+ iy[1] = iy[0] + _curFrame.width;
+ iy[2] = iy[1] + _curFrame.width;
+ iy[3] = iy[2] + _curFrame.width;
+
+ for (uint16 x = _curFrame.strips[strip].rect.left; x < _curFrame.strips[strip].rect.right; x += 4) {
+ if ((chunkID & 0x01) && !(mask >>= 1)) {
+ if ((stream->pos() - startPos + 4) > (int32)chunkSize)
+ return;
+
+ flag = stream->readUint32BE();
+ mask = 0x80000000;
+ }
+
+ if (!(chunkID & 0x01) || (flag & mask)) {
+ if (!(chunkID & 0x02) && !(mask >>= 1)) {
+ if ((stream->pos() - startPos + 4) > (int32)chunkSize)
+ return;
+
+ flag = stream->readUint32BE();
+ mask = 0x80000000;
+ }
+
+ if ((chunkID & 0x02) || (~flag & mask)) {
+ if ((stream->pos() - startPos + 1) > (int32)chunkSize)
+ return;
+
+ // Get the codebook
+ CinepakCodebook codebook = _curFrame.strips[strip].v1_codebook[stream->readByte()];
+
+ PUT_PIXEL(iy[0] + 0, codebook.y[0], codebook.u, codebook.v);
+ PUT_PIXEL(iy[0] + 1, codebook.y[0], codebook.u, codebook.v);
+ PUT_PIXEL(iy[1] + 0, codebook.y[0], codebook.u, codebook.v);
+ PUT_PIXEL(iy[1] + 1, codebook.y[0], codebook.u, codebook.v);
+
+ PUT_PIXEL(iy[0] + 2, codebook.y[1], codebook.u, codebook.v);
+ PUT_PIXEL(iy[0] + 3, codebook.y[1], codebook.u, codebook.v);
+ PUT_PIXEL(iy[1] + 2, codebook.y[1], codebook.u, codebook.v);
+ PUT_PIXEL(iy[1] + 3, codebook.y[1], codebook.u, codebook.v);
+
+ PUT_PIXEL(iy[2] + 0, codebook.y[2], codebook.u, codebook.v);
+ PUT_PIXEL(iy[2] + 1, codebook.y[2], codebook.u, codebook.v);
+ PUT_PIXEL(iy[3] + 0, codebook.y[2], codebook.u, codebook.v);
+ PUT_PIXEL(iy[3] + 1, codebook.y[2], codebook.u, codebook.v);
+
+ PUT_PIXEL(iy[2] + 2, codebook.y[3], codebook.u, codebook.v);
+ PUT_PIXEL(iy[2] + 3, codebook.y[3], codebook.u, codebook.v);
+ PUT_PIXEL(iy[3] + 2, codebook.y[3], codebook.u, codebook.v);
+ PUT_PIXEL(iy[3] + 3, codebook.y[3], codebook.u, codebook.v);
+ } else if (flag & mask) {
+ if ((stream->pos() - startPos + 4) > (int32)chunkSize)
+ return;
+
+ CinepakCodebook codebook = _curFrame.strips[strip].v4_codebook[stream->readByte()];
+ PUT_PIXEL(iy[0] + 0, codebook.y[0], codebook.u, codebook.v);
+ PUT_PIXEL(iy[0] + 1, codebook.y[1], codebook.u, codebook.v);
+ PUT_PIXEL(iy[1] + 0, codebook.y[2], codebook.u, codebook.v);
+ PUT_PIXEL(iy[1] + 1, codebook.y[3], codebook.u, codebook.v);
+
+ codebook = _curFrame.strips[strip].v4_codebook[stream->readByte()];
+ PUT_PIXEL(iy[0] + 2, codebook.y[0], codebook.u, codebook.v);
+ PUT_PIXEL(iy[0] + 3, codebook.y[1], codebook.u, codebook.v);
+ PUT_PIXEL(iy[1] + 2, codebook.y[2], codebook.u, codebook.v);
+ PUT_PIXEL(iy[1] + 3, codebook.y[3], codebook.u, codebook.v);
+
+ codebook = _curFrame.strips[strip].v4_codebook[stream->readByte()];
+ PUT_PIXEL(iy[2] + 0, codebook.y[0], codebook.u, codebook.v);
+ PUT_PIXEL(iy[2] + 1, codebook.y[1], codebook.u, codebook.v);
+ PUT_PIXEL(iy[3] + 0, codebook.y[2], codebook.u, codebook.v);
+ PUT_PIXEL(iy[3] + 1, codebook.y[3], codebook.u, codebook.v);
+
+ codebook = _curFrame.strips[strip].v4_codebook[stream->readByte()];
+ PUT_PIXEL(iy[2] + 2, codebook.y[0], codebook.u, codebook.v);
+ PUT_PIXEL(iy[2] + 3, codebook.y[1], codebook.u, codebook.v);
+ PUT_PIXEL(iy[3] + 2, codebook.y[2], codebook.u, codebook.v);
+ PUT_PIXEL(iy[3] + 3, codebook.y[3], codebook.u, codebook.v);
+ }
+ }
+
+ for (byte i = 0; i < 4; i++)
+ iy[i] += 4;
+ }
+ }
+}
+
+} // End of namespace Graphics
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