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Diffstat (limited to 'src/lib/util/chdcodec.h')
-rw-r--r-- | src/lib/util/chdcodec.h | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/src/lib/util/chdcodec.h b/src/lib/util/chdcodec.h new file mode 100644 index 00000000000..fd47e811ccb --- /dev/null +++ b/src/lib/util/chdcodec.h @@ -0,0 +1,212 @@ +/*************************************************************************** + + chdcodec.h + + Codecs used by the CHD format + +**************************************************************************** + + Copyright Aaron Giles + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in + the documentation and/or other materials provided with the + distribution. + * Neither the name 'MAME' nor the names of its contributors may be + used to endorse or promote products derived from this software + without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY AARON GILES ''AS IS'' AND ANY EXPRESS OR + IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + DISCLAIMED. IN NO EVENT SHALL AARON GILES BE LIABLE FOR ANY DIRECT, + INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + POSSIBILITY OF SUCH DAMAGE. + +***************************************************************************/ + +#pragma once + +#ifndef __CHDCODEC_H__ +#define __CHDCODEC_H__ + +#include "osdcore.h" + + +#define CHDCODEC_VERIFY_COMPRESSION 0 + + +//************************************************************************** +// MACROS +//************************************************************************** + +#define CHD_MAKE_TAG(a,b,c,d) (((a) << 24) | ((b) << 16) | ((c) << 8) | (d)) + + + +//************************************************************************** +// TYPE DEFINITIONS +//************************************************************************** + +// forward references +class chd_file; + +// base types +typedef UINT32 chd_codec_type; + + +// ======================> chd_codec + +// common base class for all compressors and decompressors +class chd_codec +{ +protected: + // can't create these directly + chd_codec(chd_file &file, bool lossy); + +public: + // allow public deletion + virtual ~chd_codec(); + + // accessors + chd_file &chd() const { return m_chd; } + bool lossy() const { return m_lossy; } + + // implementation + virtual void configure(int param, void *config); + +private: + // internal state + chd_file & m_chd; + bool m_lossy; +}; + + +// ======================> chd_compressor + +// base class for all compressors +class chd_compressor : public chd_codec +{ +protected: + // can't create these directly + chd_compressor(chd_file &file, bool lossy); + +public: + // implementation + virtual UINT32 compress(const UINT8 *src, UINT32 srclen, UINT8 *dest) = 0; +}; + + +// ======================> chd_decompressor + +// base class for all decompressors +class chd_decompressor : public chd_codec +{ +protected: + // can't create these directly + chd_decompressor(chd_file &file, bool lossy); + +public: + // implementation + virtual void decompress(const UINT8 *src, UINT32 complen, UINT8 *dest, UINT32 destlen) = 0; +}; + + +// ======================> chd_codec_list + +// wrapper to get at the list of codecs +class chd_codec_list +{ +public: + // create compressors or decompressors + static chd_compressor *new_compressor(chd_codec_type type, chd_file &file); + static chd_decompressor *new_decompressor(chd_codec_type type, chd_file &file); + + // utilities + static bool codec_exists(chd_codec_type type) { return (find_in_list(type) != NULL); } + static const char *codec_name(chd_codec_type type); + +private: + // an entry in the list + struct codec_entry + { + chd_codec_type m_type; + bool m_lossy; + const char * m_name; + chd_compressor * (*m_construct_compressor)(chd_file &, bool); + chd_decompressor * (*m_construct_decompressor)(chd_file &, bool); + }; + + // internal helper functions + static const codec_entry *find_in_list(chd_codec_type type); + + template<class _CompressorClass> + static chd_compressor *construct_compressor(chd_file &chd, bool lossy) { return new _CompressorClass(chd, lossy); } + + template<class _DecompressorClass> + static chd_decompressor *construct_decompressor(chd_file &chd, bool lossy) { return new _DecompressorClass(chd, lossy); } + + // the static list + static const codec_entry s_codec_list[]; +}; + + +// ======================> chd_compressor_group + +// helper class that wraps several compressors +class chd_compressor_group +{ +public: + // construction/destruction + chd_compressor_group(chd_file &file, chd_codec_type compressor_list[4]); + ~chd_compressor_group(); + + // find the best compressor + INT8 find_best_compressor(const UINT8 *src, UINT8 *compressed, UINT32 &complen); + +private: + // internal state + UINT32 m_hunkbytes; // number of bytes in a hunk + chd_compressor * m_compressor[4]; // array of active codecs + dynamic_buffer m_compress_test; // test buffer for compression +#if CHDCODEC_VERIFY_COMPRESSION + chd_decompressor * m_decompressor[4]; // array of active codecs + dynamic_buffer m_decompressed; // verification buffer +#endif +}; + + + +//************************************************************************** +// CONSTANTS +//************************************************************************** + +// currently-defined codecs +const chd_codec_type CHD_CODEC_NONE = 0; +const chd_codec_type CHD_CODEC_ZLIB = CHD_MAKE_TAG('z','l','i','b'); +const chd_codec_type CHD_CODEC_LZMA = CHD_MAKE_TAG('l','z','m','a'); +const chd_codec_type CHD_CODEC_HUFFMAN = CHD_MAKE_TAG('h','u','f','f'); +const chd_codec_type CHD_CODEC_FLAC_BE = CHD_MAKE_TAG('f','l','c','b'); +const chd_codec_type CHD_CODEC_FLAC_LE = CHD_MAKE_TAG('f','l','c','l'); +const chd_codec_type CHD_CODEC_AVHUFF = CHD_MAKE_TAG('a','v','h','u'); + +// A/V codec configuration parameters +enum +{ + AVHUFF_CODEC_DECOMPRESS_CONFIG = 1 +}; + + +#endif // __CHDCODEC_H__ |