diff options
Diffstat (limited to 'media/libstagefright/codecs/mp3dec/src/pvmp3_dct_6.cpp')
| -rw-r--r-- | media/libstagefright/codecs/mp3dec/src/pvmp3_dct_6.cpp | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/mp3dec/src/pvmp3_dct_6.cpp b/media/libstagefright/codecs/mp3dec/src/pvmp3_dct_6.cpp new file mode 100644 index 0000000..4c5fb03 --- /dev/null +++ b/media/libstagefright/codecs/mp3dec/src/pvmp3_dct_6.cpp @@ -0,0 +1,152 @@ +/* ------------------------------------------------------------------ + * 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. + * ------------------------------------------------------------------- + */ +/* +------------------------------------------------------------------------------ + + PacketVideo Corp. + MP3 Decoder Library + + Filename: pvmp3_dct6.cpp + + Date: 09/21/2007 + +------------------------------------------------------------------------------ + REVISION HISTORY + + + Description: + +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + +Input + Int32 vec[] vector of 6 32-bit integers +Returns + Int32 vec[] dct computation in-place + + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + Returns the dct of length 6 of the input vector + +------------------------------------------------------------------------------ + REQUIREMENTS + + +------------------------------------------------------------------------------ + REFERENCES + +------------------------------------------------------------------------------ + PSEUDO-CODE + +------------------------------------------------------------------------------ +*/ + + +/*---------------------------------------------------------------------------- +; INCLUDES +----------------------------------------------------------------------------*/ + +#include "pvmp3_audio_type_defs.h" +#include "pv_mp3dec_fxd_op.h" +#include "pvmp3_mdct_6.h" + + +/*---------------------------------------------------------------------------- +; MACROS +; Define module specific macros here +----------------------------------------------------------------------------*/ + + +/*---------------------------------------------------------------------------- +; DEFINES +; Include all pre-processor statements here. Include conditional +; compile variables also. +----------------------------------------------------------------------------*/ +#define Qfmt30(a) (Int32)(a*((Int32)1<<30) + (a>=0?0.5F:-0.5F)) + +#define cos_pi_6 Qfmt30( 0.86602540378444f) +#define cos_2_pi_6 Qfmt30( 0.5f) +#define cos_7_pi_12 Qfmt30( -0.25881904510252f) +#define cos_3_pi_12 Qfmt30( 0.70710678118655f) +#define cos_11_pi_12 Qfmt30( -0.96592582628907f) + +/*---------------------------------------------------------------------------- +; 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 pvmp3_dct_6(int32 vec[]) +{ + + Int32 tmp0; + Int32 tmp1; + Int32 tmp2; + Int32 tmp3; + Int32 tmp4; + Int32 tmp5; + + + /* split input vector */ + + tmp0 = vec[5] + vec[0]; + tmp5 = vec[5] - vec[0]; + tmp1 = vec[4] + vec[1]; + tmp4 = vec[4] - vec[1]; + tmp2 = vec[3] + vec[2]; + tmp3 = vec[3] - vec[2]; + + vec[0] = tmp0 + tmp2 ; + vec[2] = fxp_mul32_Q30(tmp0 - tmp2, cos_pi_6); + vec[4] = (vec[0] >> 1) - tmp1; + vec[0] += tmp1; + + tmp0 = fxp_mul32_Q30(tmp3, cos_7_pi_12); + tmp0 = fxp_mac32_Q30(tmp4, -cos_3_pi_12, tmp0); + vec[1] = fxp_mac32_Q30(tmp5, cos_11_pi_12, tmp0); + + vec[3] = fxp_mul32_Q30((tmp3 + tmp4 - tmp5), cos_3_pi_12); + tmp0 = fxp_mul32_Q30(tmp3, cos_11_pi_12); + tmp0 = fxp_mac32_Q30(tmp4, cos_3_pi_12, tmp0); + vec[5] = fxp_mac32_Q30(tmp5, cos_7_pi_12, tmp0); + +} + + + + |