Optimize ADPCM (sosCODEC) decompression

[giulianobelinassi]

This commit optimizes ADPCM decompression in game by:

• Removing any unsupported modes that the game do not use.
• Using a table of possible values instead of computing them on each iteration.

This new table is built by employing a dynamic programming techinque. The possible values are bound and the product of the dimensions are small, hence this techinque is quite effective in optimizing things by precomputing the values.

Signed-off-by: Giuliano Belinassi [email protected]

[isojalka]

For what it's worth, I've tested this patch with a few missions of TD and RA and found no functional issues.

[tomsons26]

what i'd want to see here is

typedef struct _tagCOMPRESS_CHANNEL_INFO
{
    unsigned int dwSampleIndex;
    int dwPredicted;
    int dwDifference;
    short wCodeBuf;
    short wCode;
    short wStep;
    short wIndex;
} _COMPRESS_CHANNEL_INFO;

typedef struct _tagCOMPRESS_INFO
{
    char* lpSource;
    char* lpDest;
    unsigned int dwCompSize;
    unsigned int dwUnCompSize;
    _COMPRESS_CHANNEL_INFO Channels[2];
    short wBitSize;
    short wChannels; // added BP for # of channels
} _SOS_COMPRESS_INFO;

that way you can get the code cleaner mostly likey with less duplication

[giulianobelinassi]

Ping