Preserving 24-bit accuracy for fixed-point decoder

celt/arch.h

celt/celt.h

celt/celt_decoder.c

celt/celt_encoder.c

configure.ac

silk/API.h

silk/dec_API.c

src/mapping_matrix.c

src/mapping_matrix.h

src/opus_decoder.c

src/opus_multistream_decoder.c

src/opus_private.h

src/opus_projection_decoder.c

tests/test_opus_projection.c