diff options
Diffstat (limited to 'media/libstagefright/codecs/aacdec/dst16.cpp')
| -rw-r--r-- | media/libstagefright/codecs/aacdec/dst16.cpp | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/aacdec/dst16.cpp b/media/libstagefright/codecs/aacdec/dst16.cpp new file mode 100644 index 0000000..41c9259 --- /dev/null +++ b/media/libstagefright/codecs/aacdec/dst16.cpp @@ -0,0 +1,172 @@ +/* ------------------------------------------------------------------ + * Copyright (C) 1998-2009 PacketVideo + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either + * express or implied. + * See the License for the specific language governing permissions + * and limitations under the License. + * ------------------------------------------------------------------- + */ +/* + + Filename: dst16.c + +------------------------------------------------------------------------------ + REVISION HISTORY + + + Who: Date: MM/DD/YYYY + Description: + +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + Int32 x 32-bit integer input length 16 + + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + Implement discrete sine transform of lenght 16 + +------------------------------------------------------------------------------ + REQUIREMENTS + + +------------------------------------------------------------------------------ + REFERENCES + +------------------------------------------------------------------------------ + PSEUDO-CODE + +------------------------------------------------------------------------------ +*/ + + +/*---------------------------------------------------------------------------- +; INCLUDES +----------------------------------------------------------------------------*/ + +#ifdef AAC_PLUS + +#include "dst16.h" +#include "dst8.h" +#include "fxp_mul32.h" + +/*---------------------------------------------------------------------------- +; MACROS +; Define module specific macros here +----------------------------------------------------------------------------*/ + + +/*---------------------------------------------------------------------------- +; DEFINES +; Include all pre-processor statements here. Include conditional +; compile variables also. +----------------------------------------------------------------------------*/ + + +#define R_SHIFT 28 +#define Qfmt(x) (Int32)(x*((Int32)1<<R_SHIFT) + (x>=0?0.5F:-0.5F)) + +const Int32 CosTable_8[8] = +{ + Qfmt(0.50241928618816F), Qfmt(0.52249861493969F), + Qfmt(0.56694403481636F), Qfmt(0.64682178335999F), + Qfmt(0.78815462345125F), Qfmt(1.06067768599035F), + Qfmt(1.72244709823833F), Qfmt(5.10114861868916F) +}; + +/*---------------------------------------------------------------------------- +; LOCAL FUNCTION DEFINITIONS +; Function Prototype declaration +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; LOCAL STORE/BUFFER/POINTER DEFINITIONS +; Variable declaration - defined here and used outside this module +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; EXTERNAL FUNCTION REFERENCES +; Declare functions defined elsewhere and referenced in this module +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES +; Declare variables used in this module but defined elsewhere +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; FUNCTION CODE +----------------------------------------------------------------------------*/ + + +void dst_16(Int32 vec[], Int32 scratch_mem[]) /* scratch_mem size 8 */ +{ + Int32 *temp_even = scratch_mem; + + Int i; + const Int32 *pt_cos = &CosTable_8[7]; + Int32 tmp0 = vec[15] >> 1; + Int32 tmp1, tmp2; + Int32 *pt_even = temp_even; + Int32 *pt_odd = vec; + Int32 *pt_vec = vec; + Int32 *pt_vecN_1; + Int32 tmp3; + + + *(pt_even++) = *(pt_vec++); + tmp1 = *(pt_vec++); + *(pt_odd++) = tmp1; + + for (i = 3; i != 0; i--) + { + *(pt_even++) = *(pt_vec++); + tmp2 = *(pt_vec++); + *(pt_even++) = *(pt_vec++); + tmp3 = *(pt_vec++); + *(pt_odd++) = tmp2 + tmp1; + *(pt_odd++) = tmp3 + tmp2; + tmp1 = tmp3; + + } + + *(pt_even) = *(pt_vec++); + *(pt_odd++) = *(pt_vec) + tmp1; + + + dst_8(temp_even); + dst_8(vec); + + pt_vec = &vec[7]; + + pt_even = &temp_even[7]; + pt_vecN_1 = &vec[8]; + + tmp1 = *(pt_even--); + + for (i = 4; i != 0; i--) + { + tmp3 = fxp_mul32_Q28((*(pt_vec) - tmp0), *(pt_cos--)); + tmp2 = *(pt_even--); + *(pt_vec--) = tmp3 + tmp1; + *(pt_vecN_1++) = tmp3 - tmp1; + tmp3 = fxp_mul32_Q28((*(pt_vec) + tmp0), *(pt_cos--)); + tmp1 = *(pt_even--); + *(pt_vecN_1++) = tmp3 - tmp2; + *(pt_vec--) = tmp3 + tmp2; + } + +} + +#endif |