| /* ------------------------------------------------------------------ |
| * 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_polyphase_filter_window.cpp |
| |
| Date: 09/21/2007 |
| |
| ------------------------------------------------------------------------------ |
| REVISION HISTORY |
| |
| |
| Description: |
| |
| ------------------------------------------------------------------------------ |
| INPUT AND OUTPUT DEFINITIONS |
| |
| |
| Input |
| int32 *synth_buffer, synthesis input buffer |
| int16 *outPcm, generated output ( 32 values) |
| int32 numChannels number of channels |
| Returns |
| |
| int16 *outPcm |
| |
| ------------------------------------------------------------------------------ |
| FUNCTION DESCRIPTION |
| |
| apply polyphase filter window |
| Input 32 subband samples |
| Calculate 64 values |
| ------------------------------------------------------------------------------ |
| REQUIREMENTS |
| |
| |
| ------------------------------------------------------------------------------ |
| REFERENCES |
| |
| [1] ISO MPEG Audio Subgroup Software Simulation Group (1996) |
| ISO 13818-3 MPEG-2 Audio Decoder - Lower Sampling Frequency Extension |
| |
| ------------------------------------------------------------------------------ |
| PSEUDO-CODE |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| #if ( !defined(PV_ARM_GCC_V5) && !defined(PV_ARM_GCC_V4) && !defined(PV_ARM_V5) && !defined(PV_ARM_V4) ) |
| /*---------------------------------------------------------------------------- |
| ; INCLUDES |
| ----------------------------------------------------------------------------*/ |
| |
| #include "pvmp3_polyphase_filter_window.h" |
| #include "pv_mp3dec_fxd_op.h" |
| #include "pvmp3_dec_defs.h" |
| #include "pvmp3_tables.h" |
| |
| /*---------------------------------------------------------------------------- |
| ; MACROS |
| ; Define module1 specific macros here |
| ----------------------------------------------------------------------------*/ |
| |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; DEFINES |
| ; Include all pre-processor statements here. Include conditional |
| ; compile variables also. |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; LOCAL FUNCTION DEFINITIONS |
| ; Function Prototype declaration |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; LOCAL STORE/BUFFER/POINTER DEFINITIONS |
| ; Variable declaration - defined here and used outside this module1 |
| ----------------------------------------------------------------------------*/ |
| /*---------------------------------------------------------------------------- |
| ; EXTERNAL FUNCTION REFERENCES |
| ; Declare functions defined elsewhere and referenced in this module_x |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES |
| ; Declare variables used in this module_x but defined elsewhere |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; FUNCTION CODE |
| ----------------------------------------------------------------------------*/ |
| |
| void pvmp3_polyphase_filter_window(int32 *synth_buffer, |
| int16 *outPcm, |
| int32 numChannels) |
| { |
| int32 sum1; |
| int32 sum2; |
| const int32 *winPtr = pqmfSynthWin; |
| int32 i; |
| |
| |
| for (int16 j = 1; j < SUBBANDS_NUMBER / 2; j++) |
| { |
| sum1 = 0x00000020; |
| sum2 = 0x00000020; |
| |
| |
| for (i = (SUBBANDS_NUMBER >> 1); |
| i < HAN_SIZE + (SUBBANDS_NUMBER >> 1); |
| i += SUBBANDS_NUMBER << 4) |
| { |
| int32 *pt_1 = &synth_buffer[ i+j]; |
| int32 *pt_2 = &synth_buffer[ i-j]; |
| int32 temp1 = pt_1[ 0]; |
| int32 temp3 = pt_2[ SUBBANDS_NUMBER*15 ]; |
| int32 temp2 = pt_2[ SUBBANDS_NUMBER* 1 ]; |
| int32 temp4 = pt_1[ SUBBANDS_NUMBER*14 ]; |
| |
| sum1 = fxp_mac32_Q32(sum1, temp1, winPtr[ 0]); |
| sum2 = fxp_mac32_Q32(sum2, temp3, winPtr[ 0]); |
| sum2 = fxp_mac32_Q32(sum2, temp1, winPtr[ 1]); |
| sum1 = fxp_msb32_Q32(sum1, temp3, winPtr[ 1]); |
| sum1 = fxp_mac32_Q32(sum1, temp2, winPtr[ 2]); |
| sum2 = fxp_msb32_Q32(sum2, temp4, winPtr[ 2]); |
| sum2 = fxp_mac32_Q32(sum2, temp2, winPtr[ 3]); |
| sum1 = fxp_mac32_Q32(sum1, temp4, winPtr[ 3]); |
| |
| temp1 = pt_1[ SUBBANDS_NUMBER* 2]; |
| temp3 = pt_2[ SUBBANDS_NUMBER*13]; |
| temp2 = pt_2[ SUBBANDS_NUMBER* 3]; |
| temp4 = pt_1[ SUBBANDS_NUMBER*12]; |
| |
| sum1 = fxp_mac32_Q32(sum1, temp1, winPtr[ 4]); |
| sum2 = fxp_mac32_Q32(sum2, temp3, winPtr[ 4]); |
| sum2 = fxp_mac32_Q32(sum2, temp1, winPtr[ 5]); |
| sum1 = fxp_msb32_Q32(sum1, temp3, winPtr[ 5]); |
| sum1 = fxp_mac32_Q32(sum1, temp2, winPtr[ 6]); |
| sum2 = fxp_msb32_Q32(sum2, temp4, winPtr[ 6]); |
| sum2 = fxp_mac32_Q32(sum2, temp2, winPtr[ 7]); |
| sum1 = fxp_mac32_Q32(sum1, temp4, winPtr[ 7]); |
| |
| temp1 = pt_1[ SUBBANDS_NUMBER* 4 ]; |
| temp3 = pt_2[ SUBBANDS_NUMBER*11 ]; |
| temp2 = pt_2[ SUBBANDS_NUMBER* 5 ]; |
| temp4 = pt_1[ SUBBANDS_NUMBER*10 ]; |
| |
| sum1 = fxp_mac32_Q32(sum1, temp1, winPtr[ 8]); |
| sum2 = fxp_mac32_Q32(sum2, temp3, winPtr[ 8]); |
| sum2 = fxp_mac32_Q32(sum2, temp1, winPtr[ 9]); |
| sum1 = fxp_msb32_Q32(sum1, temp3, winPtr[ 9]); |
| sum1 = fxp_mac32_Q32(sum1, temp2, winPtr[10]); |
| sum2 = fxp_msb32_Q32(sum2, temp4, winPtr[10]); |
| sum2 = fxp_mac32_Q32(sum2, temp2, winPtr[11]); |
| sum1 = fxp_mac32_Q32(sum1, temp4, winPtr[11]); |
| |
| temp1 = pt_1[ SUBBANDS_NUMBER*6 ]; |
| temp3 = pt_2[ SUBBANDS_NUMBER*9 ]; |
| temp2 = pt_2[ SUBBANDS_NUMBER*7 ]; |
| temp4 = pt_1[ SUBBANDS_NUMBER*8 ]; |
| |
| sum1 = fxp_mac32_Q32(sum1, temp1, winPtr[12]); |
| sum2 = fxp_mac32_Q32(sum2, temp3, winPtr[12]); |
| sum2 = fxp_mac32_Q32(sum2, temp1, winPtr[13]); |
| sum1 = fxp_msb32_Q32(sum1, temp3, winPtr[13]); |
| sum1 = fxp_mac32_Q32(sum1, temp2, winPtr[14]); |
| sum2 = fxp_msb32_Q32(sum2, temp4, winPtr[14]); |
| sum2 = fxp_mac32_Q32(sum2, temp2, winPtr[15]); |
| sum1 = fxp_mac32_Q32(sum1, temp4, winPtr[15]); |
| |
| winPtr += 16; |
| } |
| |
| |
| |
| int32 k = j << (numChannels - 1); |
| outPcm[k] = saturate16(sum1 >> 6); |
| outPcm[(numChannels<<5) - k] = saturate16(sum2 >> 6); |
| } |
| |
| |
| |
| sum1 = 0x00000020; |
| sum2 = 0x00000020; |
| |
| |
| for (i = 16; i < HAN_SIZE + 16; i += (SUBBANDS_NUMBER << 2)) |
| { |
| int32 *pt_synth = &synth_buffer[i]; |
| int32 temp1 = pt_synth[ 0 ]; |
| int32 temp2 = pt_synth[ SUBBANDS_NUMBER ]; |
| int32 temp3 = pt_synth[ SUBBANDS_NUMBER/2]; |
| |
| sum1 = fxp_mac32_Q32(sum1, temp1, winPtr[0]) ; |
| sum1 = fxp_mac32_Q32(sum1, temp2, winPtr[1]) ; |
| sum2 = fxp_mac32_Q32(sum2, temp3, winPtr[2]) ; |
| |
| temp1 = pt_synth[ SUBBANDS_NUMBER<<1 ]; |
| temp2 = pt_synth[ 3*SUBBANDS_NUMBER ]; |
| temp3 = pt_synth[ SUBBANDS_NUMBER*5/2]; |
| |
| sum1 = fxp_mac32_Q32(sum1, temp1, winPtr[3]) ; |
| sum1 = fxp_mac32_Q32(sum1, temp2, winPtr[4]) ; |
| sum2 = fxp_mac32_Q32(sum2, temp3, winPtr[5]) ; |
| |
| winPtr += 6; |
| } |
| |
| |
| outPcm[0] = saturate16(sum1 >> 6); |
| outPcm[(SUBBANDS_NUMBER/2)<<(numChannels-1)] = saturate16(sum2 >> 6); |
| |
| |
| } |
| |
| #endif // If not assembly |
| |