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Diffstat (limited to 'image/codecs/indeo/get_bits.h')
-rw-r--r-- | image/codecs/indeo/get_bits.h | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/image/codecs/indeo/get_bits.h b/image/codecs/indeo/get_bits.h new file mode 100644 index 0000000000..dd6ba55dd2 --- /dev/null +++ b/image/codecs/indeo/get_bits.h @@ -0,0 +1,169 @@ +/* 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. + * + */ + +#include "common/scummsys.h" + +/* Intel Indeo 4 bitstream reader + * + * Original copyright note: + * Copyright (c) 2004 Michael Niedermayer + */ + +#ifndef IMAGE_CODECS_INDEO_GET_BITS_H +#define IMAGE_CODECS_INDEO_GET_BITS_H + +#include "common/scummsys.h" + +namespace Image { +namespace Indeo { + +#define AV_INPUT_BUFFER_PADDING_SIZE 32 + +/** + * Intel Indeo Bitstream reader + */ +class GetBits { +private: + const byte *_buffer; + uint _index; + uint _sizeInBits; + uint _sizeInBitsPlus8; +public: + /** + * Constructor + * @param buffer bitstream buffer, must be AV_INPUT_BUFFER_PADDING_SIZE bytes + * larger than the actual read bits because some optimized bitstream + * readers read 32 or 64 bit at once and could read over the end + * @param bit_size the size of the buffer in bits + * @return 0 on success, AVERROR_INVALIDDATA if the buffer_size would overflow. + */ + GetBits(const byte *buffer, size_t totalBits); + + GetBits(const GetBits &src); + + /** + * Returns the number of bits read + */ + uint getBitsCount() const { return _index; } + + /** + * The number of bits left + */ + int getBitsLeft() const { return _sizeInBits - _index; } + + void skipBitsLong(uint n) { _index += n; } + + /** + * Read MPEG-1 dc-style VLC (sign bit + mantissa with no MSB). + * if MSB not set it is negative + * @param n length in bits + */ + int getXbits(int n); + + /** + * Returns the next n bits, and does sign extension + */ + int getSbits(int n); + + /** + * Read 1-25 bits. + */ + uint getBits(int n); + + /** + * Read 0-25 bits. + */ + int getBitsZ(int n); + + uint getBitsLE(int n); + + /** + * Show 1-25 bits. + * Returns the data without updating the index + */ + uint showBits(int n); + + /** + * Skips a specified number of bits + */ + void skipBits(int n); + + /** + * Returns the next bit + */ + uint getBits1(); + + /** + * Shows the next following bit + */ + uint showBits1(); + + /** + * Skips the next bit + */ + void skipBits1(); + + /** + * Read 0-32 bits. + */ + uint getBitsLong(int n); + + /** + * Read 0-64 bits. + */ + uint64 getBits64(int n); + + /** + * Read 0-32 bits as a signed integer. + */ + int getSbitsLong(int n); + + /** + * Show 0-32 bits. + */ + uint showBitsLong(int n); + + int checkMarker(void *logctx, const char *msg); + + /** + * Parse a VLC code. + * @param bits is the number of bits which will be read at once, must be + * identical to nb_bits in init_vlc() + * @param max_depth is the number of times bits bits must be read to completely + * read the longest vlc code + * = (max_vlc_length + bits - 1) / bits + */ + int getVLC2(int(*table)[2], int bits, int maxDepth); + + int decode012(); + + int decode210(); + + int skip1stop8dataBits(); + + const byte *alignGetBits(); +}; + +} // End of namespace Indeo +} // End of namespace Image + +#endif |