mirror of
https://github.com/sle118/squeezelite-esp32.git
synced 2025-12-10 05:27:01 +03:00
590 lines
20 KiB
C
590 lines
20 KiB
C
/* ***** BEGIN LICENSE BLOCK *****
|
|
* Source last modified: $Id: imdct.c,v 1.1 2005/02/26 01:47:35 jrecker Exp $
|
|
*
|
|
* Portions Copyright (c) 1995-2005 RealNetworks, Inc. All Rights Reserved.
|
|
*
|
|
* The contents of this file, and the files included with this file,
|
|
* are subject to the current version of the RealNetworks Public
|
|
* Source License (the "RPSL") available at
|
|
* http://www.helixcommunity.org/content/rpsl unless you have licensed
|
|
* the file under the current version of the RealNetworks Community
|
|
* Source License (the "RCSL") available at
|
|
* http://www.helixcommunity.org/content/rcsl, in which case the RCSL
|
|
* will apply. You may also obtain the license terms directly from
|
|
* RealNetworks. You may not use this file except in compliance with
|
|
* the RPSL or, if you have a valid RCSL with RealNetworks applicable
|
|
* to this file, the RCSL. Please see the applicable RPSL or RCSL for
|
|
* the rights, obligations and limitations governing use of the
|
|
* contents of the file.
|
|
*
|
|
* This file is part of the Helix DNA Technology. RealNetworks is the
|
|
* developer of the Original Code and owns the copyrights in the
|
|
* portions it created.
|
|
*
|
|
* This file, and the files included with this file, is distributed
|
|
* and made available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY
|
|
* KIND, EITHER EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS
|
|
* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES
|
|
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET
|
|
* ENJOYMENT OR NON-INFRINGEMENT.
|
|
*
|
|
* Technology Compatibility Kit Test Suite(s) Location:
|
|
* http://www.helixcommunity.org/content/tck
|
|
*
|
|
* Contributor(s):
|
|
*
|
|
* ***** END LICENSE BLOCK ***** */
|
|
|
|
/**************************************************************************************
|
|
* Fixed-point HE-AAC decoder
|
|
* Jon Recker (jrecker@real.com)
|
|
* February 2005
|
|
*
|
|
* imdct.c - inverse MDCT
|
|
**************************************************************************************/
|
|
|
|
#include "coder.h"
|
|
#include "assembly.h"
|
|
|
|
#define RND_VAL (1 << (FBITS_OUT_IMDCT-1))
|
|
|
|
#ifndef AAC_ENABLE_SBR
|
|
|
|
/**************************************************************************************
|
|
* Function: DecWindowOverlap
|
|
*
|
|
* Description: apply synthesis window, do overlap-add, clip to 16-bit PCM,
|
|
* for winSequence LONG-LONG
|
|
*
|
|
* Inputs: input buffer (output of type-IV DCT)
|
|
* overlap buffer (saved from last time)
|
|
* number of channels
|
|
* window type (sin or KBD) for input buffer
|
|
* window type (sin or KBD) for overlap buffer
|
|
*
|
|
* Outputs: one channel, one frame of 16-bit PCM, interleaved by nChans
|
|
*
|
|
* Return: none
|
|
*
|
|
* Notes: this processes one channel at a time, but skips every other sample in
|
|
* the output buffer (pcm) for stereo interleaving
|
|
* this should fit in registers on ARM
|
|
*
|
|
* TODO: ARM5E version with saturating overlap/add (QADD)
|
|
* asm code with free pointer updates, better load scheduling
|
|
**************************************************************************************/
|
|
/*__attribute__ ((section (".data")))*/ static void DecWindowOverlap(int *buf0, int *over0, short *pcm0, int nChans, int winTypeCurr, int winTypePrev)
|
|
{
|
|
int in, w0, w1, f0, f1;
|
|
int *buf1, *over1;
|
|
short *pcm1;
|
|
const int *wndPrev, *wndCurr;
|
|
|
|
buf0 += (1024 >> 1);
|
|
buf1 = buf0 - 1;
|
|
pcm1 = pcm0 + (1024 - 1) * nChans;
|
|
over1 = over0 + 1024 - 1;
|
|
|
|
wndPrev = (winTypePrev == 1 ? kbdWindow + kbdWindowOffset[1] : sinWindow + sinWindowOffset[1]);
|
|
if (winTypeCurr == winTypePrev) {
|
|
/* cut window loads in half since current and overlap sections use same symmetric window */
|
|
do {
|
|
w0 = *wndPrev++;
|
|
w1 = *wndPrev++;
|
|
in = *buf0++;
|
|
|
|
f0 = MULSHIFT32(w0, in);
|
|
f1 = MULSHIFT32(w1, in);
|
|
|
|
in = *over0;
|
|
*pcm0 = CLIPTOSHORT( (in - f0 + RND_VAL) >> FBITS_OUT_IMDCT );
|
|
pcm0 += nChans;
|
|
|
|
in = *over1;
|
|
*pcm1 = CLIPTOSHORT( (in + f1 + RND_VAL) >> FBITS_OUT_IMDCT );
|
|
pcm1 -= nChans;
|
|
|
|
in = *buf1--;
|
|
*over1-- = MULSHIFT32(w0, in);
|
|
*over0++ = MULSHIFT32(w1, in);
|
|
} while (over0 < over1);
|
|
} else {
|
|
/* different windows for current and overlap parts - should still fit in registers on ARM w/o stack spill */
|
|
wndCurr = (winTypeCurr == 1 ? kbdWindow + kbdWindowOffset[1] : sinWindow + sinWindowOffset[1]);
|
|
do {
|
|
w0 = *wndPrev++;
|
|
w1 = *wndPrev++;
|
|
in = *buf0++;
|
|
|
|
f0 = MULSHIFT32(w0, in);
|
|
f1 = MULSHIFT32(w1, in);
|
|
|
|
in = *over0;
|
|
*pcm0 = CLIPTOSHORT( (in - f0 + RND_VAL) >> FBITS_OUT_IMDCT );
|
|
pcm0 += nChans;
|
|
|
|
in = *over1;
|
|
*pcm1 = CLIPTOSHORT( (in + f1 + RND_VAL) >> FBITS_OUT_IMDCT );
|
|
pcm1 -= nChans;
|
|
|
|
w0 = *wndCurr++;
|
|
w1 = *wndCurr++;
|
|
in = *buf1--;
|
|
|
|
*over1-- = MULSHIFT32(w0, in);
|
|
*over0++ = MULSHIFT32(w1, in);
|
|
} while (over0 < over1);
|
|
}
|
|
}
|
|
|
|
/**************************************************************************************
|
|
* Function: DecWindowOverlapLongStart
|
|
*
|
|
* Description: apply synthesis window, do overlap-add, clip to 16-bit PCM,
|
|
* for winSequence LONG-START
|
|
*
|
|
* Inputs: input buffer (output of type-IV DCT)
|
|
* overlap buffer (saved from last time)
|
|
* number of channels
|
|
* window type (sin or KBD) for input buffer
|
|
* window type (sin or KBD) for overlap buffer
|
|
*
|
|
* Outputs: one channel, one frame of 16-bit PCM, interleaved by nChans
|
|
*
|
|
* Return: none
|
|
*
|
|
* Notes: this processes one channel at a time, but skips every other sample in
|
|
* the output buffer (pcm) for stereo interleaving
|
|
* this should fit in registers on ARM
|
|
*
|
|
* TODO: ARM5E version with saturating overlap/add (QADD)
|
|
* asm code with free pointer updates, better load scheduling
|
|
**************************************************************************************/
|
|
/*__attribute__ ((section (".data")))*/ static void DecWindowOverlapLongStart(int *buf0, int *over0, short *pcm0, int nChans, int winTypeCurr, int winTypePrev)
|
|
{
|
|
int i, in, w0, w1, f0, f1;
|
|
int *buf1, *over1;
|
|
short *pcm1;
|
|
const int *wndPrev, *wndCurr;
|
|
|
|
buf0 += (1024 >> 1);
|
|
buf1 = buf0 - 1;
|
|
pcm1 = pcm0 + (1024 - 1) * nChans;
|
|
over1 = over0 + 1024 - 1;
|
|
|
|
wndPrev = (winTypePrev == 1 ? kbdWindow + kbdWindowOffset[1] : sinWindow + sinWindowOffset[1]);
|
|
i = 448; /* 2 outputs, 2 overlaps per loop */
|
|
do {
|
|
w0 = *wndPrev++;
|
|
w1 = *wndPrev++;
|
|
in = *buf0++;
|
|
|
|
f0 = MULSHIFT32(w0, in);
|
|
f1 = MULSHIFT32(w1, in);
|
|
|
|
in = *over0;
|
|
*pcm0 = CLIPTOSHORT( (in - f0 + RND_VAL) >> FBITS_OUT_IMDCT );
|
|
pcm0 += nChans;
|
|
|
|
in = *over1;
|
|
*pcm1 = CLIPTOSHORT( (in + f1 + RND_VAL) >> FBITS_OUT_IMDCT );
|
|
pcm1 -= nChans;
|
|
|
|
in = *buf1--;
|
|
|
|
*over1-- = 0; /* Wn = 0 for n = (2047, 2046, ... 1600) */
|
|
*over0++ = in >> 1; /* Wn = 1 for n = (1024, 1025, ... 1471) */
|
|
} while (--i);
|
|
|
|
wndCurr = (winTypeCurr == 1 ? kbdWindow + kbdWindowOffset[0] : sinWindow + sinWindowOffset[0]);
|
|
|
|
/* do 64 more loops - 2 outputs, 2 overlaps per loop */
|
|
do {
|
|
w0 = *wndPrev++;
|
|
w1 = *wndPrev++;
|
|
in = *buf0++;
|
|
|
|
f0 = MULSHIFT32(w0, in);
|
|
f1 = MULSHIFT32(w1, in);
|
|
|
|
in = *over0;
|
|
*pcm0 = CLIPTOSHORT( (in - f0 + RND_VAL) >> FBITS_OUT_IMDCT );
|
|
pcm0 += nChans;
|
|
|
|
in = *over1;
|
|
*pcm1 = CLIPTOSHORT( (in + f1 + RND_VAL) >> FBITS_OUT_IMDCT );
|
|
pcm1 -= nChans;
|
|
|
|
w0 = *wndCurr++; /* W[0], W[1], ... --> W[255], W[254], ... */
|
|
w1 = *wndCurr++; /* W[127], W[126], ... --> W[128], W[129], ... */
|
|
in = *buf1--;
|
|
|
|
*over1-- = MULSHIFT32(w0, in); /* Wn = short window for n = (1599, 1598, ... , 1536) */
|
|
*over0++ = MULSHIFT32(w1, in); /* Wn = short window for n = (1472, 1473, ... , 1535) */
|
|
} while (over0 < over1);
|
|
}
|
|
|
|
/**************************************************************************************
|
|
* Function: DecWindowOverlapLongStop
|
|
*
|
|
* Description: apply synthesis window, do overlap-add, clip to 16-bit PCM,
|
|
* for winSequence LONG-STOP
|
|
*
|
|
* Inputs: input buffer (output of type-IV DCT)
|
|
* overlap buffer (saved from last time)
|
|
* number of channels
|
|
* window type (sin or KBD) for input buffer
|
|
* window type (sin or KBD) for overlap buffer
|
|
*
|
|
* Outputs: one channel, one frame of 16-bit PCM, interleaved by nChans
|
|
*
|
|
* Return: none
|
|
*
|
|
* Notes: this processes one channel at a time, but skips every other sample in
|
|
* the output buffer (pcm) for stereo interleaving
|
|
* this should fit in registers on ARM
|
|
*
|
|
* TODO: ARM5E version with saturating overlap/add (QADD)
|
|
* asm code with free pointer updates, better load scheduling
|
|
**************************************************************************************/
|
|
/*__attribute__ ((section (".data")))*/ static void DecWindowOverlapLongStop(int *buf0, int *over0, short *pcm0, int nChans, int winTypeCurr, int winTypePrev)
|
|
{
|
|
int i, in, w0, w1, f0, f1;
|
|
int *buf1, *over1;
|
|
short *pcm1;
|
|
const int *wndPrev, *wndCurr;
|
|
|
|
buf0 += (1024 >> 1);
|
|
buf1 = buf0 - 1;
|
|
pcm1 = pcm0 + (1024 - 1) * nChans;
|
|
over1 = over0 + 1024 - 1;
|
|
|
|
wndPrev = (winTypePrev == 1 ? kbdWindow + kbdWindowOffset[0] : sinWindow + sinWindowOffset[0]);
|
|
wndCurr = (winTypeCurr == 1 ? kbdWindow + kbdWindowOffset[1] : sinWindow + sinWindowOffset[1]);
|
|
|
|
i = 448; /* 2 outputs, 2 overlaps per loop */
|
|
do {
|
|
/* Wn = 0 for n = (0, 1, ... 447) */
|
|
/* Wn = 1 for n = (576, 577, ... 1023) */
|
|
in = *buf0++;
|
|
f1 = in >> 1; /* scale since skipping multiply by Q31 */
|
|
|
|
in = *over0;
|
|
*pcm0 = CLIPTOSHORT( (in + RND_VAL) >> FBITS_OUT_IMDCT );
|
|
pcm0 += nChans;
|
|
|
|
in = *over1;
|
|
*pcm1 = CLIPTOSHORT( (in + f1 + RND_VAL) >> FBITS_OUT_IMDCT );
|
|
pcm1 -= nChans;
|
|
|
|
w0 = *wndCurr++;
|
|
w1 = *wndCurr++;
|
|
in = *buf1--;
|
|
|
|
*over1-- = MULSHIFT32(w0, in);
|
|
*over0++ = MULSHIFT32(w1, in);
|
|
} while (--i);
|
|
|
|
/* do 64 more loops - 2 outputs, 2 overlaps per loop */
|
|
do {
|
|
w0 = *wndPrev++; /* W[0], W[1], ...W[63] */
|
|
w1 = *wndPrev++; /* W[127], W[126], ... W[64] */
|
|
in = *buf0++;
|
|
|
|
f0 = MULSHIFT32(w0, in);
|
|
f1 = MULSHIFT32(w1, in);
|
|
|
|
in = *over0;
|
|
*pcm0 = CLIPTOSHORT( (in - f0 + RND_VAL) >> FBITS_OUT_IMDCT );
|
|
pcm0 += nChans;
|
|
|
|
in = *over1;
|
|
*pcm1 = CLIPTOSHORT( (in + f1 + RND_VAL) >> FBITS_OUT_IMDCT );
|
|
pcm1 -= nChans;
|
|
|
|
w0 = *wndCurr++;
|
|
w1 = *wndCurr++;
|
|
in = *buf1--;
|
|
|
|
*over1-- = MULSHIFT32(w0, in);
|
|
*over0++ = MULSHIFT32(w1, in);
|
|
} while (over0 < over1);
|
|
}
|
|
|
|
/**************************************************************************************
|
|
* Function: DecWindowOverlapShort
|
|
*
|
|
* Description: apply synthesis window, do overlap-add, clip to 16-bit PCM,
|
|
* for winSequence EIGHT-SHORT (does all 8 short blocks)
|
|
*
|
|
* Inputs: input buffer (output of type-IV DCT)
|
|
* overlap buffer (saved from last time)
|
|
* number of channels
|
|
* window type (sin or KBD) for input buffer
|
|
* window type (sin or KBD) for overlap buffer
|
|
*
|
|
* Outputs: one channel, one frame of 16-bit PCM, interleaved by nChans
|
|
*
|
|
* Return: none
|
|
*
|
|
* Notes: this processes one channel at a time, but skips every other sample in
|
|
* the output buffer (pcm) for stereo interleaving
|
|
* this should fit in registers on ARM
|
|
*
|
|
* TODO: ARM5E version with saturating overlap/add (QADD)
|
|
* asm code with free pointer updates, better load scheduling
|
|
**************************************************************************************/
|
|
/*__attribute__ ((section (".data"))) */ static void DecWindowOverlapShort(int *buf0, int *over0, short *pcm0, int nChans, int winTypeCurr, int winTypePrev)
|
|
{
|
|
int i, in, w0, w1, f0, f1;
|
|
int *buf1, *over1;
|
|
short *pcm1;
|
|
const int *wndPrev, *wndCurr;
|
|
|
|
wndPrev = (winTypePrev == 1 ? kbdWindow + kbdWindowOffset[0] : sinWindow + sinWindowOffset[0]);
|
|
wndCurr = (winTypeCurr == 1 ? kbdWindow + kbdWindowOffset[0] : sinWindow + sinWindowOffset[0]);
|
|
|
|
/* pcm[0-447] = 0 + overlap[0-447] */
|
|
i = 448;
|
|
do {
|
|
f0 = *over0++;
|
|
f1 = *over0++;
|
|
*pcm0 = CLIPTOSHORT( (f0 + RND_VAL) >> FBITS_OUT_IMDCT ); pcm0 += nChans;
|
|
*pcm0 = CLIPTOSHORT( (f1 + RND_VAL) >> FBITS_OUT_IMDCT ); pcm0 += nChans;
|
|
i -= 2;
|
|
} while (i);
|
|
|
|
/* pcm[448-575] = Wp[0-127] * block0[0-127] + overlap[448-575] */
|
|
pcm1 = pcm0 + (128 - 1) * nChans;
|
|
over1 = over0 + 128 - 1;
|
|
buf0 += 64;
|
|
buf1 = buf0 - 1;
|
|
do {
|
|
w0 = *wndPrev++; /* W[0], W[1], ...W[63] */
|
|
w1 = *wndPrev++; /* W[127], W[126], ... W[64] */
|
|
in = *buf0++;
|
|
|
|
f0 = MULSHIFT32(w0, in);
|
|
f1 = MULSHIFT32(w1, in);
|
|
|
|
in = *over0;
|
|
*pcm0 = CLIPTOSHORT( (in - f0 + RND_VAL) >> FBITS_OUT_IMDCT );
|
|
pcm0 += nChans;
|
|
|
|
in = *over1;
|
|
*pcm1 = CLIPTOSHORT( (in + f1 + RND_VAL) >> FBITS_OUT_IMDCT );
|
|
pcm1 -= nChans;
|
|
|
|
w0 = *wndCurr++;
|
|
w1 = *wndCurr++;
|
|
in = *buf1--;
|
|
|
|
/* save over0/over1 for next short block, in the slots just vacated */
|
|
*over1-- = MULSHIFT32(w0, in);
|
|
*over0++ = MULSHIFT32(w1, in);
|
|
} while (over0 < over1);
|
|
|
|
/* pcm[576-703] = Wc[128-255] * block0[128-255] + Wc[0-127] * block1[0-127] + overlap[576-703]
|
|
* pcm[704-831] = Wc[128-255] * block1[128-255] + Wc[0-127] * block2[0-127] + overlap[704-831]
|
|
* pcm[832-959] = Wc[128-255] * block2[128-255] + Wc[0-127] * block3[0-127] + overlap[832-959]
|
|
*/
|
|
for (i = 0; i < 3; i++) {
|
|
pcm0 += 64 * nChans;
|
|
pcm1 = pcm0 + (128 - 1) * nChans;
|
|
over0 += 64;
|
|
over1 = over0 + 128 - 1;
|
|
buf0 += 64;
|
|
buf1 = buf0 - 1;
|
|
wndCurr -= 128;
|
|
|
|
do {
|
|
w0 = *wndCurr++; /* W[0], W[1], ...W[63] */
|
|
w1 = *wndCurr++; /* W[127], W[126], ... W[64] */
|
|
in = *buf0++;
|
|
|
|
f0 = MULSHIFT32(w0, in);
|
|
f1 = MULSHIFT32(w1, in);
|
|
|
|
in = *(over0 - 128); /* from last short block */
|
|
in += *(over0 + 0); /* from last full frame */
|
|
*pcm0 = CLIPTOSHORT( (in - f0 + RND_VAL) >> FBITS_OUT_IMDCT );
|
|
pcm0 += nChans;
|
|
|
|
in = *(over1 - 128); /* from last short block */
|
|
in += *(over1 + 0); /* from last full frame */
|
|
*pcm1 = CLIPTOSHORT( (in + f1 + RND_VAL) >> FBITS_OUT_IMDCT );
|
|
pcm1 -= nChans;
|
|
|
|
/* save over0/over1 for next short block, in the slots just vacated */
|
|
in = *buf1--;
|
|
*over1-- = MULSHIFT32(w0, in);
|
|
*over0++ = MULSHIFT32(w1, in);
|
|
} while (over0 < over1);
|
|
}
|
|
|
|
/* pcm[960-1023] = Wc[128-191] * block3[128-191] + Wc[0-63] * block4[0-63] + overlap[960-1023]
|
|
* over[0-63] = Wc[192-255] * block3[192-255] + Wc[64-127] * block4[64-127]
|
|
*/
|
|
pcm0 += 64 * nChans;
|
|
over0 -= 832; /* points at overlap[64] */
|
|
over1 = over0 + 128 - 1; /* points at overlap[191] */
|
|
buf0 += 64;
|
|
buf1 = buf0 - 1;
|
|
wndCurr -= 128;
|
|
do {
|
|
w0 = *wndCurr++; /* W[0], W[1], ...W[63] */
|
|
w1 = *wndCurr++; /* W[127], W[126], ... W[64] */
|
|
in = *buf0++;
|
|
|
|
f0 = MULSHIFT32(w0, in);
|
|
f1 = MULSHIFT32(w1, in);
|
|
|
|
in = *(over0 + 768); /* from last short block */
|
|
in += *(over0 + 896); /* from last full frame */
|
|
*pcm0 = CLIPTOSHORT( (in - f0 + RND_VAL) >> FBITS_OUT_IMDCT );
|
|
pcm0 += nChans;
|
|
|
|
in = *(over1 + 768); /* from last short block */
|
|
*(over1 - 128) = in + f1;
|
|
|
|
in = *buf1--;
|
|
*over1-- = MULSHIFT32(w0, in); /* save in overlap[128-191] */
|
|
*over0++ = MULSHIFT32(w1, in); /* save in overlap[64-127] */
|
|
} while (over0 < over1);
|
|
|
|
/* over0 now points at overlap[128] */
|
|
|
|
/* over[64-191] = Wc[128-255] * block4[128-255] + Wc[0-127] * block5[0-127]
|
|
* over[192-319] = Wc[128-255] * block5[128-255] + Wc[0-127] * block6[0-127]
|
|
* over[320-447] = Wc[128-255] * block6[128-255] + Wc[0-127] * block7[0-127]
|
|
* over[448-576] = Wc[128-255] * block7[128-255]
|
|
*/
|
|
for (i = 0; i < 3; i++) {
|
|
over0 += 64;
|
|
over1 = over0 + 128 - 1;
|
|
buf0 += 64;
|
|
buf1 = buf0 - 1;
|
|
wndCurr -= 128;
|
|
do {
|
|
w0 = *wndCurr++; /* W[0], W[1], ...W[63] */
|
|
w1 = *wndCurr++; /* W[127], W[126], ... W[64] */
|
|
in = *buf0++;
|
|
|
|
f0 = MULSHIFT32(w0, in);
|
|
f1 = MULSHIFT32(w1, in);
|
|
|
|
/* from last short block */
|
|
*(over0 - 128) -= f0;
|
|
*(over1 - 128)+= f1;
|
|
|
|
in = *buf1--;
|
|
*over1-- = MULSHIFT32(w0, in);
|
|
*over0++ = MULSHIFT32(w1, in);
|
|
} while (over0 < over1);
|
|
}
|
|
|
|
/* over[576-1024] = 0 */
|
|
i = 448;
|
|
over0 += 64;
|
|
do {
|
|
*over0++ = 0;
|
|
*over0++ = 0;
|
|
*over0++ = 0;
|
|
*over0++ = 0;
|
|
i -= 4;
|
|
} while (i);
|
|
}
|
|
|
|
#endif /* !AAC_ENABLE_SBR */
|
|
|
|
/**************************************************************************************
|
|
* Function: IMDCT
|
|
*
|
|
* Description: inverse transform and convert to 16-bit PCM
|
|
*
|
|
* Inputs: valid AACDecInfo struct
|
|
* index of current channel (0 for SCE/LFE, 0 or 1 for CPE)
|
|
* output channel (range = [0, nChans-1])
|
|
*
|
|
* Outputs: complete frame of decoded PCM, after inverse transform
|
|
*
|
|
* Return: 0 if successful, -1 if error
|
|
*
|
|
* Notes: If AAC_ENABLE_SBR is defined at compile time then window + overlap
|
|
* does NOT clip to 16-bit PCM and does NOT interleave channels
|
|
* If AAC_ENABLE_SBR is NOT defined at compile time, then window + overlap
|
|
* does clip to 16-bit PCM and interleaves channels
|
|
* If SBR is enabled at compile time, but we don't know whether it is
|
|
* actually used for this frame (e.g. the first frame of a stream),
|
|
* we need to produce both clipped 16-bit PCM in outbuf AND
|
|
* unclipped 32-bit PCM in the SBR input buffer. In this case we make
|
|
* a separate pass over the 32-bit PCM to produce 16-bit PCM output.
|
|
* This inflicts a slight performance hit when decoding non-SBR files.
|
|
**************************************************************************************/
|
|
int IMDCT(AACDecInfo *aacDecInfo, int ch, int chOut, short *outbuf)
|
|
{
|
|
int i;
|
|
PSInfoBase *psi;
|
|
ICSInfo *icsInfo;
|
|
|
|
/* validate pointers */
|
|
if (!aacDecInfo || !aacDecInfo->psInfoBase)
|
|
return -1;
|
|
psi = (PSInfoBase *)(aacDecInfo->psInfoBase);
|
|
icsInfo = (ch == 1 && psi->commonWin == 1) ? &(psi->icsInfo[0]) : &(psi->icsInfo[ch]);
|
|
outbuf += chOut;
|
|
|
|
/* optimized type-IV DCT (operates inplace) */
|
|
if (icsInfo->winSequence == 2) {
|
|
/* 8 short blocks */
|
|
for (i = 0; i < 8; i++)
|
|
DCT4(0, psi->coef[ch] + i*128, psi->gbCurrent[ch]);
|
|
} else {
|
|
/* 1 long block */
|
|
DCT4(1, psi->coef[ch], psi->gbCurrent[ch]);
|
|
}
|
|
|
|
#ifdef AAC_ENABLE_SBR
|
|
/* window, overlap-add, don't clip to short (send to SBR decoder)
|
|
* store the decoded 32-bit samples in top half (second AAC_MAX_NSAMPS samples) of coef buffer
|
|
*/
|
|
if (icsInfo->winSequence == 0)
|
|
DecWindowOverlapNoClip(psi->coef[ch], psi->overlap[chOut], psi->sbrWorkBuf[ch], icsInfo->winShape, psi->prevWinShape[chOut]);
|
|
else if (icsInfo->winSequence == 1)
|
|
DecWindowOverlapLongStartNoClip(psi->coef[ch], psi->overlap[chOut], psi->sbrWorkBuf[ch], icsInfo->winShape, psi->prevWinShape[chOut]);
|
|
else if (icsInfo->winSequence == 2)
|
|
DecWindowOverlapShortNoClip(psi->coef[ch], psi->overlap[chOut], psi->sbrWorkBuf[ch], icsInfo->winShape, psi->prevWinShape[chOut]);
|
|
else if (icsInfo->winSequence == 3)
|
|
DecWindowOverlapLongStopNoClip(psi->coef[ch], psi->overlap[chOut], psi->sbrWorkBuf[ch], icsInfo->winShape, psi->prevWinShape[chOut]);
|
|
|
|
if (!aacDecInfo->sbrEnabled) {
|
|
for (i = 0; i < AAC_MAX_NSAMPS; i++) {
|
|
*outbuf = CLIPTOSHORT((psi->sbrWorkBuf[ch][i] + RND_VAL) >> FBITS_OUT_IMDCT);
|
|
outbuf += aacDecInfo->nChans;
|
|
}
|
|
}
|
|
|
|
aacDecInfo->rawSampleBuf[ch] = psi->sbrWorkBuf[ch];
|
|
aacDecInfo->rawSampleBytes = sizeof(int);
|
|
aacDecInfo->rawSampleFBits = FBITS_OUT_IMDCT;
|
|
#else
|
|
/* window, overlap-add, round to PCM - optimized for each window sequence */
|
|
if (icsInfo->winSequence == 0)
|
|
DecWindowOverlap(psi->coef[ch], psi->overlap[chOut], outbuf, aacDecInfo->nChans, icsInfo->winShape, psi->prevWinShape[chOut]);
|
|
else if (icsInfo->winSequence == 1)
|
|
DecWindowOverlapLongStart(psi->coef[ch], psi->overlap[chOut], outbuf, aacDecInfo->nChans, icsInfo->winShape, psi->prevWinShape[chOut]);
|
|
else if (icsInfo->winSequence == 2)
|
|
DecWindowOverlapShort(psi->coef[ch], psi->overlap[chOut], outbuf, aacDecInfo->nChans, icsInfo->winShape, psi->prevWinShape[chOut]);
|
|
else if (icsInfo->winSequence == 3)
|
|
DecWindowOverlapLongStop(psi->coef[ch], psi->overlap[chOut], outbuf, aacDecInfo->nChans, icsInfo->winShape, psi->prevWinShape[chOut]);
|
|
|
|
aacDecInfo->rawSampleBuf[ch] = 0;
|
|
aacDecInfo->rawSampleBytes = 0;
|
|
aacDecInfo->rawSampleFBits = 0;
|
|
#endif
|
|
|
|
psi->prevWinShape[chOut] = icsInfo->winShape;
|
|
|
|
return 0;
|
|
}
|