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image/codecs/indeo5.h

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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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/* Intel Indeo 4 decompressor, derived from ffmpeg.
+ *
+ * Original copyright note:
+ * Intel Indeo 4 (IV31, IV32, etc.) video decoder for ffmpeg
+ * written, produced, and directed by Alan Smithee
+ */
+
+#ifndef IMAGE_CODECS_INDEO5_H
+#define IMAGE_CODECS_INDEO5_H
+
+#include "image/codecs/indeo/get_bits.h"
+#include "image/codecs/indeo/indeo.h"
+
+namespace Image {
+
+using namespace Indeo;
+
+/**
+ * Intel Indeo 5 decoder.
+ *
+ * Used by AVI.
+ *
+ * Used in video:
+ *  - AVIDecoder
+ */
+class Indeo5Decoder : public IndeoDecoderBase {
+	struct Transform {
+		InvTransformPtr *inv_trans;
+		DCTransformPtr  *dc_trans;
+		int             is_2d_trans;
+	};
+public:
+	Indeo5Decoder(uint16 width, uint16 height, uint bitsPerPixel = 16);
+	~Indeo5Decoder() override {}
+
+	const Graphics::Surface *decodeFrame(Common::SeekableReadStream &stream) override;
+
+	static bool isIndeo5(Common::SeekableReadStream &stream);
+protected:
+	/**
+	 * Decode the Indeo 5 picture header.
+	 * @returns		0 = Ok, negative number = error
+	 */
+	int decodePictureHeader() override;
+
+	/**
+	 *  Rearrange decoding and reference buffers.
+	 */
+	void switchBuffers() override;
+
+	bool isNonNullFrame() const override;
+
+	/**
+	 *  Decode Indeo 4 band header.
+	 *
+	 *  @param[in,out] band      pointer to the band descriptor
+	 *  @return        result code: 0 = OK, negative number = error
+	 */
+	int decodeBandHeader(IVIBandDesc *band) override;
+
+	/**
+	 *  Decode information (block type, cbp, quant delta, motion vector)
+	 *  for all macroblocks in the current tile.
+	 *
+	 *  @param[in,out] band      pointer to the band descriptor
+	 *  @param[in,out] tile      pointer to the tile descriptor
+	 *  @return        result code: 0 = OK, negative number = error
+	 */
+	int decodeMbInfo(IVIBandDesc *band, IVITile *tile) override;
+private:
+	/**
+	 *  Decode Indeo5 GOP (Group of pictures) header.
+	 *  This header is present in key frames only.
+	 *  It defines parameters for all frames in a GOP.
+	 *  @returns	result code: 0 = OK, -1 = error
+	 */
+	int decode_gop_header();
+
+	/**
+	 *  Skip a header extension.
+	 */
+	int skip_hdr_extension();
+
+private:
+	/**
+	 *  standard picture dimensions (width, height divided by 4)
+	 */
+	static const uint8 _commonPicSizes[30];
+
+	/**
+	 *  Indeo5 dequantization matrixes consist of two tables: base table
+	 *  and scale table. The base table defines the dequantization matrix
+	 *  itself and the scale table tells how this matrix should be scaled
+	 *  for a particular quant level (0...24).
+	 *
+	 *  ivi5_base_quant_bbb_ttt  - base  tables for block size 'bbb' of type 'ttt'
+	 *  ivi5_scale_quant_bbb_ttt - scale tables for block size 'bbb' of type 'ttt'
+	 */
+	static const uint16 _baseQuant8x8Inter[5][64];
+	static const uint16 _baseQuant8x8Intra[5][64];
+
+	static const uint16 _baseQuant4x4Inter[16];
+	static const uint16 _baseQuant4x4Intra[16];
+
+	static const uint8 _scaleQuant8x8Inter[5][24];
+	static const uint8 _scaleQuant8x8Intra[5][24];
+
+	static const uint8 _scaleQuant4x4Inter[24];
+	static const uint8 _scaleQuant4x4Intra[24];
+};
+
+} // End of namespace Image
+
+#endif