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Diffstat (limited to 'media/libstagefright/codecs/mp3dec/src/pvmp3_polyphase_filter_window.cpp')
| -rw-r--r-- | media/libstagefright/codecs/mp3dec/src/pvmp3_polyphase_filter_window.cpp | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/mp3dec/src/pvmp3_polyphase_filter_window.cpp b/media/libstagefright/codecs/mp3dec/src/pvmp3_polyphase_filter_window.cpp new file mode 100644 index 0000000..8380437 --- /dev/null +++ b/media/libstagefright/codecs/mp3dec/src/pvmp3_polyphase_filter_window.cpp @@ -0,0 +1,239 @@ +/* ------------------------------------------------------------------ + * 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 + |