| /* ------------------------------------------------------------------ |
| * 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_dct_9.cpp |
| |
| Date: 09/21/2007 |
| |
| ------------------------------------------------------------------------------ |
| REVISION HISTORY |
| |
| |
| Description: |
| |
| ------------------------------------------------------------------------------ |
| INPUT AND OUTPUT DEFINITIONS |
| |
| Input |
| int32 vec[] vector of 9 32-bit integers |
| Returns |
| int32 vec[] dct computation in-place |
| |
| |
| ------------------------------------------------------------------------------ |
| FUNCTION DESCRIPTION |
| |
| Returns the dct of length 9 of the input vector |
| |
| ------------------------------------------------------------------------------ |
| REQUIREMENTS |
| |
| |
| ------------------------------------------------------------------------------ |
| REFERENCES |
| |
| ------------------------------------------------------------------------------ |
| PSEUDO-CODE |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| #if ( !defined(PV_ARM_GCC_V5) && !defined(PV_ARM_GCC_V4) && !defined(PV_ARM_V5) && !defined(PV_ARM_V4) ) |
| /*---------------------------------------------------------------------------- |
| ; INCLUDES |
| ----------------------------------------------------------------------------*/ |
| #include "pvmp3_audio_type_defs.h" |
| #include "pv_mp3dec_fxd_op.h" |
| #include "pvmp3_mdct_18.h" |
| |
| /*---------------------------------------------------------------------------- |
| ; MACROS |
| ; Define module specific macros here |
| ----------------------------------------------------------------------------*/ |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; DEFINES |
| ; Include all pre-processor statements here. Include conditional |
| ; compile variables also. |
| ----------------------------------------------------------------------------*/ |
| #define Qfmt31(a) (int32)((a)*((float)0x7FFFFFFF)) |
| |
| #define cos_pi_9 Qfmt31( 0.93969262078591f) |
| #define cos_2pi_9 Qfmt31( 0.76604444311898f) |
| #define cos_4pi_9 Qfmt31( 0.17364817766693f) |
| #define cos_5pi_9 Qfmt31(-0.17364817766693f) |
| #define cos_7pi_9 Qfmt31(-0.76604444311898f) |
| #define cos_8pi_9 Qfmt31(-0.93969262078591f) |
| #define cos_pi_6 Qfmt31( 0.86602540378444f) |
| #define cos_5pi_6 Qfmt31(-0.86602540378444f) |
| #define cos_5pi_18 Qfmt31( 0.64278760968654f) |
| #define cos_7pi_18 Qfmt31( 0.34202014332567f) |
| #define cos_11pi_18 Qfmt31(-0.34202014332567f) |
| #define cos_13pi_18 Qfmt31(-0.64278760968654f) |
| #define cos_17pi_18 Qfmt31(-0.98480775301221f) |
| |
| /*---------------------------------------------------------------------------- |
| ; 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 |
| ----------------------------------------------------------------------------*/ |
| |
| __attribute__((no_sanitize("integer"))) |
| void pvmp3_dct_9(int32 vec[]) |
| { |
| |
| /* split input vector */ |
| |
| int32 tmp0 = vec[8] + vec[0]; |
| int32 tmp8 = vec[8] - vec[0]; |
| int32 tmp1 = vec[7] + vec[1]; |
| int32 tmp7 = vec[7] - vec[1]; |
| int32 tmp2 = vec[6] + vec[2]; |
| int32 tmp6 = vec[6] - vec[2]; |
| int32 tmp3 = vec[5] + vec[3]; |
| int32 tmp5 = vec[5] - vec[3]; |
| |
| vec[0] = (tmp0 + tmp2 + tmp3) + (tmp1 + vec[4]); |
| vec[6] = ((tmp0 + tmp2 + tmp3) >> 1) - (tmp1 + vec[4]); |
| vec[2] = (tmp1 >> 1) - vec[4]; |
| vec[4] = -vec[2]; |
| vec[8] = -vec[2]; |
| vec[4] = fxp_mac32_Q32(vec[4], tmp0 << 1, cos_2pi_9); |
| vec[8] = fxp_mac32_Q32(vec[8], tmp0 << 1, cos_4pi_9); |
| vec[2] = fxp_mac32_Q32(vec[2], tmp0 << 1, cos_pi_9); |
| vec[2] = fxp_mac32_Q32(vec[2], tmp2 << 1, cos_5pi_9); |
| vec[4] = fxp_mac32_Q32(vec[4], tmp2 << 1, cos_8pi_9); |
| vec[8] = fxp_mac32_Q32(vec[8], tmp2 << 1, cos_2pi_9); |
| vec[8] = fxp_mac32_Q32(vec[8], tmp3 << 1, cos_8pi_9); |
| vec[4] = fxp_mac32_Q32(vec[4], tmp3 << 1, cos_4pi_9); |
| vec[2] = fxp_mac32_Q32(vec[2], tmp3 << 1, cos_7pi_9); |
| |
| vec[1] = fxp_mul32_Q32(tmp5 << 1, cos_11pi_18); |
| vec[1] = fxp_mac32_Q32(vec[1], tmp6 << 1, cos_13pi_18); |
| vec[1] = fxp_mac32_Q32(vec[1], tmp7 << 1, cos_5pi_6); |
| vec[1] = fxp_mac32_Q32(vec[1], tmp8 << 1, cos_17pi_18); |
| vec[3] = fxp_mul32_Q32((tmp5 + tmp6 - tmp8) << 1, cos_pi_6); |
| vec[5] = fxp_mul32_Q32(tmp5 << 1, cos_17pi_18); |
| vec[5] = fxp_mac32_Q32(vec[5], tmp6 << 1, cos_7pi_18); |
| vec[5] = fxp_mac32_Q32(vec[5], tmp7 << 1, cos_pi_6); |
| vec[5] = fxp_mac32_Q32(vec[5], tmp8 << 1, cos_13pi_18); |
| vec[7] = fxp_mul32_Q32(tmp5 << 1, cos_5pi_18); |
| vec[7] = fxp_mac32_Q32(vec[7], tmp6 << 1, cos_17pi_18); |
| vec[7] = fxp_mac32_Q32(vec[7], tmp7 << 1, cos_pi_6); |
| vec[7] = fxp_mac32_Q32(vec[7], tmp8 << 1, cos_11pi_18); |
| |
| } |
| |
| |
| |
| #endif // If not assembly |