diff options
Diffstat (limited to 'audio/decoders/adpcm_intern.h')
| -rw-r--r-- | audio/decoders/adpcm_intern.h | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/audio/decoders/adpcm_intern.h b/audio/decoders/adpcm_intern.h index 8e092e67ad..b566f2c765 100644 --- a/audio/decoders/adpcm_intern.h +++ b/audio/decoders/adpcm_intern.h @@ -61,7 +61,6 @@ protected: } _status; virtual void reset(); - int16 stepAdjust(byte); public: ADPCMStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse, uint32 size, int rate, int channels, uint32 blockAlign); @@ -72,6 +71,16 @@ public: virtual int getRate() const { return _rate; } virtual bool rewind(); + + + /** + * This table is used by some ADPCM variants (IMA and OKI) to adjust the + * step for use on the next sample. + * The first 8 entries are identical to the second 8 entries. Hence, we + * could half the table in size. But since the lookup index is always a + * 4-bit nibble, it is more efficient to just keep it as it is. + */ + static const int16 _stepAdjustTable[16]; }; class Oki_ADPCMStream : public ADPCMStream { @@ -96,6 +105,12 @@ public: } virtual int readBuffer(int16 *buffer, const int numSamples); + + + /** + * This table is used by decodeIMA. + */ + static const int16 _imaTable[89]; }; class Apple_ADPCMStream : public Ima_ADPCMStream { |