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|
/************************* Fast MPEG AAC Audio Encoder **********************
(C) Copyright Fraunhofer IIS (2000)
All Rights Reserved
Please be advised that this software and/or program delivery is
Confidential Information of Fraunhofer and subject to and covered by the
Fraunhofer IIS Software Evaluation Agreement
between Google Inc. and Fraunhofer
effective and in full force since March 1, 2012.
You may use this software and/or program only under the terms and
conditions described in the above mentioned Fraunhofer IIS Software
Evaluation Agreement. Any other and/or further use requires a separate agreement.
This software and/or program is protected by copyright law and international
treaties. Any reproduction or distribution of this software and/or program,
or any portion of it, may result in severe civil and criminal penalties, and
will be prosecuted to the maximum extent possible under law.
$Id$
Initial author: A. Groeschel
contents/description: channel mapping functionality
******************************************************************************/
#include "channel_map.h"
#include "bitenc.h"
#include "psy_const.h"
#include "qc_data.h"
#include "aacEnc_ram.h"
/* channel_assignment treats the relationship of Input file channels
to the encoder channels.
This is necessary because the usual order in RIFF files (.wav)
is different from the elements order in the coder given
by Table 8.1 (implicit speaker mapping) of the AAC standard.
In mono and stereo case, this is trivial.
In mc case, it looks like this:
Channel Input file coder chan
5ch:
front center 2 0 (SCE channel)
left center 0 1 (1st of 1st CPE)
right center 1 2 (2nd of 1st CPE)
left surround 3 3 (1st of 2nd CPE)
right surround 4 4 (2nd of 2nd CPE)
5.1ch:
front center 2 0 (SCE channel)
left center 0 1 (1st of 1st CPE)
right center 1 2 (2nd of 1st CPE)
left surround 4 3 (1st of 2nd CPE)
right surround 5 4 (2nd of 2nd CPE)
LFE 3 5 (LFE)
*/
typedef struct {
CHANNEL_MODE encoderMode;
INT channel_assignment[/*(6)*/12];
} CHANNEL_ASSIGNMENT_INFO_TAB;
static const CHANNEL_ASSIGNMENT_INFO_TAB assignmentInfoTabMpeg[] =
{
{ MODE_INVALID, {-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1} }, /* invalid */
{ MODE_1, { 0,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1} }, /* mono */
{ MODE_2, { 0, 1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1} }, /* stereo */
{ MODE_1_2, { 0, 1, 2,-1,-1,-1,-1,-1,-1,-1,-1,-1} }, /* 3ch */
{ MODE_1_2_1, { 0, 1, 2, 3,-1,-1,-1,-1,-1,-1,-1,-1} }, /* 4ch */
{ MODE_1_2_2, { 0, 1, 2, 3, 4,-1,-1,-1,-1,-1,-1,-1} }, /* 5ch */
{ MODE_1_2_2_1, { 0, 1, 2, 3, 4, 5,-1,-1,-1,-1,-1,-1} }, /* 5.1ch */
{ MODE_1_2_2_2_1, { 0, 1, 2, 3, 4, 5, 6, 7,-1,-1,-1,-1} }, /* 7.1ch */
};
static const CHANNEL_ASSIGNMENT_INFO_TAB assignmentInfoTabWav[] =
{
{ MODE_INVALID, {-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1} }, /* invalid */
{ MODE_1, { 0,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1} }, /* mono */
{ MODE_2, { 0, 1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1} }, /* stereo */
{ MODE_1_2, { 2, 0, 1,-1,-1,-1,-1,-1,-1,-1,-1,-1} }, /* 3ch */
{ MODE_1_2_1, { 2, 0, 1, 3,-1,-1,-1,-1,-1,-1,-1,-1} }, /* 4ch */
{ MODE_1_2_2, { 2, 0, 1, 3, 4,-1,-1,-1,-1,-1,-1,-1} }, /* 5ch */
{ MODE_1_2_2_1, { 2, 0, 1, 4, 5, 3,-1,-1,-1,-1,-1,-1} }, /* 5.1ch */
{ MODE_1_2_2_2_1, { 2, 0, 1, 6, 7, 4, 5, 3,-1,-1,-1,-1} }, /* 7.1ch */
};
/* Channel mode configuration tab provides,
corresponding number of channels and elements
*/
static const CHANNEL_MODE_CONFIG_TAB channelModeConfig[] =
{
{ MODE_1, 1, 1, 1 }, /* SCE */
{ MODE_2, 2, 2, 1 }, /* CPE */
{ MODE_1_2, 3, 3, 2 }, /* SCE,CPE */
{ MODE_1_2_1, 4, 4, 3 }, /* SCE,CPE,SCE */
{ MODE_1_2_2, 5, 5, 3 }, /* SCE,CPE,CPE */
{ MODE_1_2_2_1, 6, 5, 4 }, /* SCE,CPE,CPE,LFE */
{ MODE_1_2_2_2_1, 8, 7, 5 }, /* SCE,CPE,CPE,CPE,LFE */
};
#define MAX_MODES (sizeof(assignmentInfoTabWav)/sizeof(CHANNEL_ASSIGNMENT_INFO_TAB))
const INT* FDKaacEnc_getChannelAssignment(CHANNEL_MODE encMode, CHANNEL_ORDER co)
{
const CHANNEL_ASSIGNMENT_INFO_TAB *pTab;
int i;
if (co == CH_ORDER_MPEG)
pTab = assignmentInfoTabMpeg;
else
pTab = assignmentInfoTabWav;
for(i=MAX_MODES-1; i>0; i--) {
if (encMode== pTab[i].encoderMode) {
break;
}
}
return (pTab[i].channel_assignment);
}
AAC_ENCODER_ERROR FDKaacEnc_DetermineEncoderMode(CHANNEL_MODE* mode, INT nChannels)
{
INT i;
CHANNEL_MODE encMode = MODE_INVALID;
if (*mode==MODE_UNKNOWN) {
for (i=0; i<(INT)sizeof(channelModeConfig)/(INT)sizeof(CHANNEL_MODE_CONFIG_TAB); i++) {
if (channelModeConfig[i].nChannels==nChannels) {
encMode = channelModeConfig[i].encMode;
break;
}
}
*mode = encMode;
}
else {
/* check if valid channel configuration */
if (FDKaacEnc_GetChannelModeConfiguration(*mode)->nChannels==nChannels) {
encMode = *mode;
}
}
if (encMode==MODE_INVALID) {
return AAC_ENC_UNSUPPORTED_CHANNELCONFIG;
}
return AAC_ENC_OK;
}
static INT FDKaacEnc_initElement (ELEMENT_INFO* elInfo, MP4_ELEMENT_ID elType, INT* cnt, CHANNEL_MODE mode, CHANNEL_ORDER co, INT* it_cnt, const FIXP_DBL relBits) {
INT error=0;
INT counter =*cnt;
const INT *assign = FDKaacEnc_getChannelAssignment(mode, co);
elInfo->elType=elType;
elInfo->relativeBits = relBits;
switch(elInfo->elType) {
case ID_SCE: case ID_LFE: case ID_CCE:
elInfo->nChannelsInEl=1;
elInfo->ChannelIndex[0]=assign[counter++];
elInfo->instanceTag=it_cnt[elType]++;
break;
case ID_CPE:
elInfo->nChannelsInEl=2;
elInfo->ChannelIndex[0]=assign[counter++];
elInfo->ChannelIndex[1]=assign[counter++];
elInfo->instanceTag=it_cnt[elType]++;
break;
case ID_DSE:
elInfo->nChannelsInEl=0;
elInfo->ChannelIndex[0]=0;
elInfo->ChannelIndex[1]=0;
elInfo->instanceTag=it_cnt[elType]++;
break;
default: error=1;
};
*cnt = counter;
return error;
}
AAC_ENCODER_ERROR FDKaacEnc_InitChannelMapping(CHANNEL_MODE mode, CHANNEL_ORDER co, CHANNEL_MAPPING* cm)
{
INT count=0; /* count through coder channels */
INT it_cnt[ID_END+1];
INT i;
for (i=0; i<ID_END; i++)
it_cnt[i]=0;
FDKmemclear(cm, sizeof(CHANNEL_MAPPING));
/* init channel mapping*/
for (i=0; i<(INT)sizeof(channelModeConfig)/(INT)sizeof(CHANNEL_MODE_CONFIG_TAB); i++) {
if (channelModeConfig[i].encMode==mode)
{
cm->encMode = channelModeConfig[i].encMode;
cm->nChannels = channelModeConfig[i].nChannels;
cm->nChannelsEff = channelModeConfig[i].nChannelsEff;
cm->nElements = channelModeConfig[i].nElements;
break;
}
}
/* init element info struct */
switch(mode) {
case MODE_1:
/* (mono) sce */
FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, mode, co, it_cnt, (FIXP_DBL)MAXVAL_DBL);
break;
case MODE_2:
/* (stereo) cpe */
FDKaacEnc_initElement(&cm->elInfo[0], ID_CPE, &count, mode, co, it_cnt, (FIXP_DBL)MAXVAL_DBL);
break;
case MODE_1_2:
/* sce + cpe */
FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.4f));
FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.6f));
break;
case MODE_1_2_1:
/* sce + cpe + sce */
FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.3f));
FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.4f));
FDKaacEnc_initElement(&cm->elInfo[2], ID_SCE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.3f));
break;
case MODE_1_2_2:
/* sce + cpe + cpe */
FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.26f));
FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.37f));
FDKaacEnc_initElement(&cm->elInfo[2], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.37f));
break;
case MODE_1_2_2_1:
/* (5.1) sce + cpe + cpe + lfe */
FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.24f));
FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.35f));
FDKaacEnc_initElement(&cm->elInfo[2], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.35f));
FDKaacEnc_initElement(&cm->elInfo[3], ID_LFE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.06f));
break;
case MODE_1_2_2_2_1:
/* (7.1) sce + cpe + cpe + cpe + lfe */
FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.18f));
FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.26f));
FDKaacEnc_initElement(&cm->elInfo[2], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.26f));
FDKaacEnc_initElement(&cm->elInfo[3], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.26f));
FDKaacEnc_initElement(&cm->elInfo[4], ID_LFE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.04f));
break;
default:
//*chMap=0;
return AAC_ENC_UNSUPPORTED_CHANNELCONFIG;
};
/* Prevent additional element and save memory for unused PSY_OUT_ELEMENT,
ATS_ELEMENT, QC_OUT_ELEMENT ...
DSE signalling is done via elDSE flag.
*/
// if (dseFlag == 1) {
// it_cnt[ID_DSE]++; /* increment DSE */
// }
// cm->elDSE = it_cnt[ID_DSE]; /* save number of DSE elemts */
FDK_ASSERT(cm->nElements<=(6));
//*chMap = cm;
return AAC_ENC_OK;
}
AAC_ENCODER_ERROR FDKaacEnc_InitElementBits(QC_STATE *hQC,
CHANNEL_MAPPING *cm,
INT bitrateTot,
INT averageBitsTot,
INT maxChannelBits)
{
int sc_brTot = CountLeadingBits(bitrateTot);
switch(cm->encMode) {
case MODE_1:
hQC->elementBits[0]->chBitrateEl = bitrateTot;
hQC->elementBits[0]->maxBitsEl = maxChannelBits;
hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits;
break;
case MODE_2:
hQC->elementBits[0]->chBitrateEl = bitrateTot>>1;
hQC->elementBits[0]->maxBitsEl = 2*maxChannelBits;
hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits;
break;
case MODE_1_2: {
hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits;
hQC->elementBits[1]->relativeBitsEl = cm->elInfo[1].relativeBits;
FIXP_DBL sceRate = cm->elInfo[0].relativeBits;
FIXP_DBL cpeRate = cm->elInfo[1].relativeBits;
hQC->elementBits[0]->chBitrateEl = fMult(sceRate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot;
hQC->elementBits[1]->chBitrateEl = fMult(cpeRate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1);
hQC->elementBits[0]->maxBitsEl = maxChannelBits;
hQC->elementBits[1]->maxBitsEl = 2*maxChannelBits;
break;
}
case MODE_1_2_1: {
/* sce + cpe + sce */
hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits;
hQC->elementBits[1]->relativeBitsEl = cm->elInfo[1].relativeBits;
hQC->elementBits[2]->relativeBitsEl = cm->elInfo[2].relativeBits;
FIXP_DBL sce1Rate = cm->elInfo[0].relativeBits;
FIXP_DBL cpeRate = cm->elInfo[1].relativeBits;
FIXP_DBL sce2Rate = cm->elInfo[2].relativeBits;
hQC->elementBits[0]->chBitrateEl = fMult(sce1Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot;
hQC->elementBits[1]->chBitrateEl = fMult(cpeRate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1);
hQC->elementBits[2]->chBitrateEl = fMult(sce2Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot;
hQC->elementBits[0]->maxBitsEl = maxChannelBits;
hQC->elementBits[1]->maxBitsEl = 2*maxChannelBits;
hQC->elementBits[2]->maxBitsEl = maxChannelBits;
break;
}
case MODE_1_2_2: {
/* sce + cpe + cpe */
hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits;
hQC->elementBits[1]->relativeBitsEl = cm->elInfo[1].relativeBits;
hQC->elementBits[2]->relativeBitsEl = cm->elInfo[2].relativeBits;
FIXP_DBL sceRate = cm->elInfo[0].relativeBits;
FIXP_DBL cpe1Rate = cm->elInfo[1].relativeBits;
FIXP_DBL cpe2Rate = cm->elInfo[2].relativeBits;
hQC->elementBits[0]->chBitrateEl = fMult(sceRate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot;
hQC->elementBits[1]->chBitrateEl = fMult(cpe1Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1);
hQC->elementBits[2]->chBitrateEl = fMult(cpe2Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1);
hQC->elementBits[0]->maxBitsEl = maxChannelBits;
hQC->elementBits[1]->maxBitsEl = 2*maxChannelBits;
hQC->elementBits[2]->maxBitsEl = 2*maxChannelBits;
break;
}
case MODE_1_2_2_1: {
/* (5.1) sce + cpe + cpe + lfe */
hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits;
hQC->elementBits[1]->relativeBitsEl = cm->elInfo[1].relativeBits;
hQC->elementBits[2]->relativeBitsEl = cm->elInfo[2].relativeBits;
hQC->elementBits[3]->relativeBitsEl = cm->elInfo[3].relativeBits;
FIXP_DBL sceRate = cm->elInfo[0].relativeBits;
FIXP_DBL cpe1Rate = cm->elInfo[1].relativeBits;
FIXP_DBL cpe2Rate = cm->elInfo[2].relativeBits;
FIXP_DBL lfeRate = cm->elInfo[3].relativeBits;
int maxBitsTot = maxChannelBits * 5; /* LFE does not add to bit reservoir */
int sc = CountLeadingBits(fixMax(maxChannelBits,averageBitsTot));
int maxLfeBits = (int) FDKmax ( (INT)((fMult(lfeRate,(FIXP_DBL)(maxChannelBits<<sc))>>sc)<<1),
(INT)((fMult(FL2FXCONST_DBL(1.1f/2.f),fMult(lfeRate,(FIXP_DBL)(averageBitsTot<<sc)))<<1)>>sc) );
maxChannelBits = (maxBitsTot - maxLfeBits);
sc = CountLeadingBits(maxChannelBits);
maxChannelBits = fMult((FIXP_DBL)maxChannelBits<<sc,GetInvInt(5))>>sc;
hQC->elementBits[0]->chBitrateEl = fMult(sceRate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot;
hQC->elementBits[1]->chBitrateEl = fMult(cpe1Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1);
hQC->elementBits[2]->chBitrateEl = fMult(cpe2Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1);
hQC->elementBits[3]->chBitrateEl = fMult(lfeRate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot;
hQC->elementBits[0]->maxBitsEl = maxChannelBits;
hQC->elementBits[1]->maxBitsEl = 2*maxChannelBits;
hQC->elementBits[2]->maxBitsEl = 2*maxChannelBits;
hQC->elementBits[3]->maxBitsEl = maxLfeBits;
break;
}
case MODE_1_2_2_2_1:{
/* (7.1) sce + cpe + cpe + cpe + lfe */
hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits;
hQC->elementBits[1]->relativeBitsEl = cm->elInfo[1].relativeBits;
hQC->elementBits[2]->relativeBitsEl = cm->elInfo[2].relativeBits;
hQC->elementBits[3]->relativeBitsEl = cm->elInfo[3].relativeBits;
hQC->elementBits[4]->relativeBitsEl = cm->elInfo[4].relativeBits;
FIXP_DBL sceRate = cm->elInfo[0].relativeBits;
FIXP_DBL cpe1Rate = cm->elInfo[1].relativeBits;
FIXP_DBL cpe2Rate = cm->elInfo[2].relativeBits;
FIXP_DBL cpe3Rate = cm->elInfo[3].relativeBits;
FIXP_DBL lfeRate = cm->elInfo[4].relativeBits;
int maxBitsTot = maxChannelBits * 7; /* LFE does not add to bit reservoir */
int sc = CountLeadingBits(fixMax(maxChannelBits,averageBitsTot));
int maxLfeBits = (int) FDKmax ( (INT)((fMult(lfeRate,(FIXP_DBL)(maxChannelBits<<sc))>>sc)<<1),
(INT)((fMult(FL2FXCONST_DBL(1.1f/2.f),fMult(lfeRate,(FIXP_DBL)(averageBitsTot<<sc)))<<1)>>sc) );
maxChannelBits = (maxBitsTot - maxLfeBits) / 7;
hQC->elementBits[0]->chBitrateEl = fMult(sceRate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot;
hQC->elementBits[1]->chBitrateEl = fMult(cpe1Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1);
hQC->elementBits[2]->chBitrateEl = fMult(cpe2Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1);
hQC->elementBits[3]->chBitrateEl = fMult(cpe3Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1);
hQC->elementBits[4]->chBitrateEl = fMult(lfeRate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot;
hQC->elementBits[0]->maxBitsEl = maxChannelBits;
hQC->elementBits[1]->maxBitsEl = 2*maxChannelBits;
hQC->elementBits[2]->maxBitsEl = 2*maxChannelBits;
hQC->elementBits[3]->maxBitsEl = 2*maxChannelBits;
hQC->elementBits[4]->maxBitsEl = maxLfeBits;
break;
}
default:
return AAC_ENC_UNSUPPORTED_CHANNELCONFIG;
}
return AAC_ENC_OK;
}
/********************************************************************************/
/* */
/* function: GetMonoStereoMODE(const CHANNEL_MODE mode) */
/* */
/* description: Determines encoder setting from channel mode. */
/* Multichannel modes are mapped to mono or stereo modes */
/* returns MODE_MONO in case of mono, */
/* MODE_STEREO in case of stereo */
/* MODE_INVALID in case of error */
/* */
/* input: CHANNEL_MODE mode: Encoder mode (see qc_data.h). */
/* output: return: CM_STEREO_MODE monoStereoSetting */
/* (MODE_INVALID: error, */
/* MODE_MONO: mono */
/* MODE_STEREO: stereo). */
/* */
/* misc: No memory is allocated. */
/* */
/********************************************************************************/
ELEMENT_MODE FDKaacEnc_GetMonoStereoMode(const CHANNEL_MODE mode){
ELEMENT_MODE monoStereoSetting = EL_MODE_INVALID;
switch(mode){
case MODE_1: /* mono setups */
monoStereoSetting = EL_MODE_MONO;
break;
case MODE_2: /* stereo setups */
case MODE_1_2:
case MODE_1_2_1:
case MODE_1_2_2:
case MODE_1_2_2_1:
case MODE_1_2_2_2_1:
monoStereoSetting = EL_MODE_STEREO;
break;
default: /* error */
monoStereoSetting = EL_MODE_INVALID;
break;
}
return monoStereoSetting;
}
const CHANNEL_MODE_CONFIG_TAB* FDKaacEnc_GetChannelModeConfiguration(const CHANNEL_MODE mode)
{
INT i;
const CHANNEL_MODE_CONFIG_TAB *cm_config = NULL;
/* get channel mode config */
for (i=0; i<(INT)sizeof(channelModeConfig)/(INT)sizeof(CHANNEL_MODE_CONFIG_TAB); i++) {
if (channelModeConfig[i].encMode==mode)
{
cm_config = &channelModeConfig[i];
break;
}
}
return cm_config;
}
/*
void FDKaacEnc_CloseChannelMapping (CHANNEL_MAPPING** phchMap) {
FreeRam_ChannelMapping(phchMap);
}
*/
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