diff options
Diffstat (limited to 'media/libstagefright/codecs/aacenc/src/block_switch.c')
| -rw-r--r-- | media/libstagefright/codecs/aacenc/src/block_switch.c | 146 |
1 files changed, 73 insertions, 73 deletions
diff --git a/media/libstagefright/codecs/aacenc/src/block_switch.c b/media/libstagefright/codecs/aacenc/src/block_switch.c index d54e32f..47fd15e 100644 --- a/media/libstagefright/codecs/aacenc/src/block_switch.c +++ b/media/libstagefright/codecs/aacenc/src/block_switch.c @@ -52,7 +52,7 @@ CalcWindowEnergy(BLOCK_SWITCHING_CONTROL *blockSwitchingControl, IIR high pass coeffs */ Word32 hiPassCoeff[BLOCK_SWITCHING_IIR_LEN] = { - 0xbec8b439, 0x609d4952 /* -0.5095f, 0.7548f */ + 0xbec8b439, 0x609d4952 /* -0.5095f, 0.7548f */ }; static const Word32 accWindowNrgFac = 0x26666666; /* factor for accumulating filtered window energies 0.3 */ @@ -76,8 +76,8 @@ Word16 InitBlockSwitching(BLOCK_SWITCHING_CONTROL *blockSwitchingControl, const Word32 bitRate, const Word16 nChannels) { /* select attackRatio */ - - if ((sub(nChannels,1)==0 && L_sub(bitRate, 24000) > 0) || + + if ((sub(nChannels,1)==0 && L_sub(bitRate, 24000) > 0) || (sub(nChannels,1)>0 && bitRate > (nChannels * 16000))) { blockSwitchingControl->invAttackRatio = invAttackRatioHighBr; } @@ -116,7 +116,7 @@ Word16 BlockSwitching(BLOCK_SWITCHING_CONTROL *blockSwitchingControl, /* Reset grouping info */ for (i=0; i<TRANS_FAC; i++) { - blockSwitchingControl->groupLen[i] = 0; + blockSwitchingControl->groupLen[i] = 0; } @@ -125,21 +125,21 @@ Word16 BlockSwitching(BLOCK_SWITCHING_CONTROL *blockSwitchingControl, &blockSwitchingControl->attackIndex, BLOCK_SWITCH_WINDOWS); - blockSwitchingControl->attackIndex = blockSwitchingControl->lastAttackIndex; + blockSwitchingControl->attackIndex = blockSwitchingControl->lastAttackIndex; /* Set grouping info */ - blockSwitchingControl->noOfGroups = MAX_NO_OF_GROUPS; + blockSwitchingControl->noOfGroups = MAX_NO_OF_GROUPS; for (i=0; i<MAX_NO_OF_GROUPS; i++) { - blockSwitchingControl->groupLen[i] = suggestedGroupingTable[blockSwitchingControl->attackIndex][i]; + blockSwitchingControl->groupLen[i] = suggestedGroupingTable[blockSwitchingControl->attackIndex][i]; } - + /* if the samplerate is less than 16000, it should be all the short block, avoid pre&post echo */ if(sampleRate >= 16000) { /* Save current window energy as last window energy */ for (w=0; w<BLOCK_SWITCH_WINDOWS; w++) { - blockSwitchingControl->windowNrg[0][w] = blockSwitchingControl->windowNrg[1][w]; - blockSwitchingControl->windowNrgF[0][w] = blockSwitchingControl->windowNrgF[1][w]; + blockSwitchingControl->windowNrg[0][w] = blockSwitchingControl->windowNrg[1][w]; + blockSwitchingControl->windowNrgF[0][w] = blockSwitchingControl->windowNrgF[1][w]; } @@ -147,10 +147,10 @@ Word16 BlockSwitching(BLOCK_SWITCHING_CONTROL *blockSwitchingControl, CalcWindowEnergy(blockSwitchingControl, timeSignal, chIncrement, BLOCK_SWITCH_WINDOW_LEN); /* reset attack */ - blockSwitchingControl->attack = FALSE; + blockSwitchingControl->attack = FALSE; - enMax = 0; - enM1 = blockSwitchingControl->windowNrgF[0][BLOCK_SWITCH_WINDOWS-1]; + enMax = 0; + enM1 = blockSwitchingControl->windowNrgF[0][BLOCK_SWITCH_WINDOWS-1]; for (w=0; w<BLOCK_SWITCH_WINDOWS; w++) { Word32 enM1_Tmp, accWindowNrg_Tmp, windowNrgF_Tmp; @@ -172,15 +172,15 @@ Word16 BlockSwitching(BLOCK_SWITCHING_CONTROL *blockSwitchingControl, /* if the energy with the ratio is bigger than the average, and the attack and short block */ if ((fixmul(windowNrgF_Tmp, blockSwitchingControl->invAttackRatio) >> windowNrgF_Shf) > blockSwitchingControl->accWindowNrg ) { - blockSwitchingControl->attack = TRUE; - blockSwitchingControl->lastAttackIndex = w; + blockSwitchingControl->attack = TRUE; + blockSwitchingControl->lastAttackIndex = w; } - enM1 = blockSwitchingControl->windowNrgF[1][w]; + enM1 = blockSwitchingControl->windowNrgF[1][w]; enMax = max(enMax, enM1); } if (enMax < minAttackNrg) { - blockSwitchingControl->attack = FALSE; + blockSwitchingControl->attack = FALSE; } } else @@ -188,22 +188,22 @@ Word16 BlockSwitching(BLOCK_SWITCHING_CONTROL *blockSwitchingControl, blockSwitchingControl->attack = TRUE; } - /* Check if attack spreads over frame border */ + /* Check if attack spreads over frame border */ if ((!blockSwitchingControl->attack) && (blockSwitchingControl->lastattack)) { - + if (blockSwitchingControl->attackIndex == TRANS_FAC-1) { - blockSwitchingControl->attack = TRUE; + blockSwitchingControl->attack = TRUE; } - blockSwitchingControl->lastattack = FALSE; + blockSwitchingControl->lastattack = FALSE; } else { - blockSwitchingControl->lastattack = blockSwitchingControl->attack; + blockSwitchingControl->lastattack = blockSwitchingControl->attack; } - blockSwitchingControl->windowSequence = blockSwitchingControl->nextwindowSequence; + blockSwitchingControl->windowSequence = blockSwitchingControl->nextwindowSequence; + - if (blockSwitchingControl->attack) { blockSwitchingControl->nextwindowSequence = SHORT_WINDOW; } @@ -211,27 +211,27 @@ Word16 BlockSwitching(BLOCK_SWITCHING_CONTROL *blockSwitchingControl, blockSwitchingControl->nextwindowSequence = LONG_WINDOW; } - /* update short block group */ + /* update short block group */ if (blockSwitchingControl->nextwindowSequence == SHORT_WINDOW) { - + if (blockSwitchingControl->windowSequence== LONG_WINDOW) { - blockSwitchingControl->windowSequence = START_WINDOW; + blockSwitchingControl->windowSequence = START_WINDOW; } - + if (blockSwitchingControl->windowSequence == STOP_WINDOW) { - blockSwitchingControl->windowSequence = SHORT_WINDOW; - blockSwitchingControl->noOfGroups = 3; - blockSwitchingControl->groupLen[0] = 3; - blockSwitchingControl->groupLen[1] = 3; - blockSwitchingControl->groupLen[2] = 2; + blockSwitchingControl->windowSequence = SHORT_WINDOW; + blockSwitchingControl->noOfGroups = 3; + blockSwitchingControl->groupLen[0] = 3; + blockSwitchingControl->groupLen[1] = 3; + blockSwitchingControl->groupLen[2] = 2; } } - /* update block type */ + /* update block type */ if (blockSwitchingControl->nextwindowSequence == LONG_WINDOW) { - + if (blockSwitchingControl->windowSequence == SHORT_WINDOW) { - blockSwitchingControl->nextwindowSequence = STOP_WINDOW; + blockSwitchingControl->nextwindowSequence = STOP_WINDOW; } } @@ -252,17 +252,17 @@ static Word32 SrchMaxWithIndex(const Word32 in[], Word16 *index, Word16 n) Word32 i, idx; /* Search maximum value in array and return index and value */ - max = 0; - idx = 0; + max = 0; + idx = 0; for (i = 0; i < n; i++) { - + if (in[i+1] > max) { - max = in[i+1]; - idx = i; + max = in[i+1]; + idx = i; } } - *index = idx; + *index = idx; return(max); } @@ -292,11 +292,11 @@ Word32 CalcWindowEnergy(BLOCK_SWITCHING_CONTROL *blockSwitchingControl, states1 = blockSwitchingControl->iirStates[1]; Coeff0 = hiPassCoeff[0]; Coeff1 = hiPassCoeff[1]; - tidx = 0; + tidx = 0; for (w=0; w < BLOCK_SWITCH_WINDOWS; w++) { - accuUE = 0; - accuFE = 0; + accuUE = 0; + accuFE = 0; for(i=0; i<windowLen; i++) { Word32 accu1, accu2, accu3; @@ -309,16 +309,16 @@ Word32 CalcWindowEnergy(BLOCK_SWITCHING_CONTROL *blockSwitchingControl, accu3 = accu1 - states0; out = accu3 - accu2; - states0 = accu1; - states1 = out; + states0 = accu1; + states1 = out; - tempFiltered = extract_h(out); + tempFiltered = extract_h(out); accuUE += (tempUnfiltered * tempUnfiltered) >> ENERGY_SHIFT; accuFE += (tempFiltered * tempFiltered) >> ENERGY_SHIFT; } - blockSwitchingControl->windowNrg[1][w] = accuUE; - blockSwitchingControl->windowNrgF[1][w] = accuFE; + blockSwitchingControl->windowNrg[1][w] = accuUE; + blockSwitchingControl->windowNrgF[1][w] = accuFE; } @@ -346,8 +346,8 @@ static Word16 IIRFilter(const Word16 in, const Word32 coeff[], Word32 states[]) accu2 = fixmul( coeff[0], states[1] ); out = accu3 - accu2; - states[0] = accu1; - states[1] = out; + states[0] = accu1; + states[1] = out; return round16(out); } @@ -374,54 +374,54 @@ Word16 SyncBlockSwitching(BLOCK_SWITCHING_CONTROL *blockSwitchingControlLeft, const Word16 nChannels) { Word16 i; - Word16 patchType = LONG_WINDOW; + Word16 patchType = LONG_WINDOW; + - if (nChannels == 1) { /* Mono */ if (blockSwitchingControlLeft->windowSequence != SHORT_WINDOW) { - blockSwitchingControlLeft->noOfGroups = 1; - blockSwitchingControlLeft->groupLen[0] = 1; + blockSwitchingControlLeft->noOfGroups = 1; + blockSwitchingControlLeft->groupLen[0] = 1; for (i=1; i<TRANS_FAC; i++) { - blockSwitchingControlLeft->groupLen[i] = 0; + blockSwitchingControlLeft->groupLen[i] = 0; } } } else { /* Stereo common Window */ - patchType = synchronizedBlockTypeTable[patchType][blockSwitchingControlLeft->windowSequence]; - patchType = synchronizedBlockTypeTable[patchType][blockSwitchingControlRight->windowSequence]; + patchType = synchronizedBlockTypeTable[patchType][blockSwitchingControlLeft->windowSequence]; + patchType = synchronizedBlockTypeTable[patchType][blockSwitchingControlRight->windowSequence]; /* Set synchronized Blocktype */ - blockSwitchingControlLeft->windowSequence = patchType; - blockSwitchingControlRight->windowSequence = patchType; + blockSwitchingControlLeft->windowSequence = patchType; + blockSwitchingControlRight->windowSequence = patchType; - /* Synchronize grouping info */ + /* Synchronize grouping info */ if(patchType != SHORT_WINDOW) { /* Long Blocks */ /* Set grouping info */ - blockSwitchingControlLeft->noOfGroups = 1; - blockSwitchingControlRight->noOfGroups = 1; - blockSwitchingControlLeft->groupLen[0] = 1; - blockSwitchingControlRight->groupLen[0] = 1; + blockSwitchingControlLeft->noOfGroups = 1; + blockSwitchingControlRight->noOfGroups = 1; + blockSwitchingControlLeft->groupLen[0] = 1; + blockSwitchingControlRight->groupLen[0] = 1; for (i=1; i<TRANS_FAC; i++) { - blockSwitchingControlLeft->groupLen[i] = 0; - blockSwitchingControlRight->groupLen[i] = 0; + blockSwitchingControlLeft->groupLen[i] = 0; + blockSwitchingControlRight->groupLen[i] = 0; } } else { - + if (blockSwitchingControlLeft->maxWindowNrg > blockSwitchingControlRight->maxWindowNrg) { /* Left Channel wins */ - blockSwitchingControlRight->noOfGroups = blockSwitchingControlLeft->noOfGroups; + blockSwitchingControlRight->noOfGroups = blockSwitchingControlLeft->noOfGroups; for (i=0; i<TRANS_FAC; i++) { - blockSwitchingControlRight->groupLen[i] = blockSwitchingControlLeft->groupLen[i]; + blockSwitchingControlRight->groupLen[i] = blockSwitchingControlLeft->groupLen[i]; } } else { /* Right Channel wins */ - blockSwitchingControlLeft->noOfGroups = blockSwitchingControlRight->noOfGroups; + blockSwitchingControlLeft->noOfGroups = blockSwitchingControlRight->noOfGroups; for (i=0; i<TRANS_FAC; i++) { - blockSwitchingControlLeft->groupLen[i] = blockSwitchingControlRight->groupLen[i]; + blockSwitchingControlLeft->groupLen[i] = blockSwitchingControlRight->groupLen[i]; } } } |