diff options
Diffstat (limited to 'media/libstagefright/codecs/aacenc/src/stat_bits.c')
| -rw-r--r-- | media/libstagefright/codecs/aacenc/src/stat_bits.c | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/aacenc/src/stat_bits.c b/media/libstagefright/codecs/aacenc/src/stat_bits.c new file mode 100644 index 0000000..c2bd8bd --- /dev/null +++ b/media/libstagefright/codecs/aacenc/src/stat_bits.c @@ -0,0 +1,237 @@ +/* + ** Copyright 2003-2010, VisualOn, Inc. + ** + ** 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. + */ +/******************************************************************************* + File: stat_bits.c + + Content: Static bit counter functions + +*******************************************************************************/ + +#include "stat_bits.h" +#include "bitenc.h" +#include "tns.h" + + +typedef enum { + SI_ID_BITS =(3), + SI_FILL_COUNT_BITS =(4), + SI_FILL_ESC_COUNT_BITS =(8), + SI_FILL_EXTENTION_BITS =(4), + SI_FILL_NIBBLE_BITS =(4), + SI_SCE_BITS =(4), + SI_CPE_BITS =(5), + SI_CPE_MS_MASK_BITS =(2) , + SI_ICS_INFO_BITS_LONG =(1+2+1+6+1), + SI_ICS_INFO_BITS_SHORT =(1+2+1+4+7), + SI_ICS_BITS =(8+1+1+1) +} SI_BITS; + + +/********************************************************************************* +* +* function name: countMsMaskBits +* description: count ms stereo bits demand +* +**********************************************************************************/ +static Word16 countMsMaskBits(Word16 sfbCnt, + Word16 sfbPerGroup, + Word16 maxSfbPerGroup, + struct TOOLSINFO *toolsInfo) +{ + Word16 msBits, sfbOff, sfb; + msBits = 0; + + + switch(toolsInfo->msDigest) { + case MS_NONE: + case MS_ALL: + break; + + case MS_SOME: + for(sfbOff=0; sfbOff<sfbCnt; sfbOff+=sfbPerGroup) + for(sfb=0; sfb<maxSfbPerGroup; sfb++) + msBits += 1; + break; + } + return(msBits); +} + +/********************************************************************************* +* +* function name: tnsCount +* description: count tns bit demand core function +* +**********************************************************************************/ +static Word16 tnsCount(TNS_INFO *tnsInfo, Word16 blockType) +{ + + Word32 i, k; + Flag tnsPresent; + Word32 numOfWindows; + Word32 count; + Word32 coefBits; + Word16 *ptcoef; + + count = 0; + + if (blockType == 2) + numOfWindows = 8; + else + numOfWindows = 1; + tnsPresent = 0; + + for (i=0; i<numOfWindows; i++) { + + if (tnsInfo->tnsActive[i]!=0) { + tnsPresent = 1; + } + } + + if (tnsPresent) { + /* there is data to be written*/ + /*count += 1; */ + for (i=0; i<numOfWindows; i++) { + + if (blockType == 2) + count += 1; + else + count += 2; + + if (tnsInfo->tnsActive[i]) { + count += 1; + + if (blockType == 2) { + count += 4; + count += 3; + } + else { + count += 6; + count += 5; + } + + if (tnsInfo->order[i]) { + count += 1; /*direction*/ + count += 1; /*coef_compression */ + + if (tnsInfo->coefRes[i] == 4) { + ptcoef = tnsInfo->coef + i*TNS_MAX_ORDER_SHORT; + coefBits = 3; + for(k=0; k<tnsInfo->order[i]; k++) { + + if ((ptcoef[k] > 3) || (ptcoef[k] < -4)) { + coefBits = 4; + break; + } + } + } + else { + coefBits = 2; + ptcoef = tnsInfo->coef + i*TNS_MAX_ORDER_SHORT; + for(k=0; k<tnsInfo->order[i]; k++) { + + if ((ptcoef[k] > 1) || (ptcoef[k] < -2)) { + coefBits = 3; + break; + } + } + } + for (k=0; k<tnsInfo->order[i]; k++ ) { + count += coefBits; + } + } + } + } + } + + return count; +} + +/********************************************************************************** +* +* function name: countTnsBits +* description: count tns bit demand +* +**********************************************************************************/ +static Word16 countTnsBits(TNS_INFO *tnsInfo,Word16 blockType) +{ + return(tnsCount(tnsInfo, blockType)); +} + +/********************************************************************************* +* +* function name: countStaticBitdemand +* description: count static bit demand include tns +* +**********************************************************************************/ +Word16 countStaticBitdemand(PSY_OUT_CHANNEL psyOutChannel[MAX_CHANNELS], + PSY_OUT_ELEMENT *psyOutElement, + Word16 channels, + Word16 adtsUsed) +{ + Word32 statBits; + Word32 ch; + + statBits = 0; + + /* if adts used, add 56 bits */ + if(adtsUsed) statBits += 56; + + + switch (channels) { + case 1: + statBits += SI_ID_BITS+SI_SCE_BITS+SI_ICS_BITS; + statBits += countTnsBits(&(psyOutChannel[0].tnsInfo), + psyOutChannel[0].windowSequence); + + switch(psyOutChannel[0].windowSequence){ + case LONG_WINDOW: + case START_WINDOW: + case STOP_WINDOW: + statBits += SI_ICS_INFO_BITS_LONG; + break; + case SHORT_WINDOW: + statBits += SI_ICS_INFO_BITS_SHORT; + break; + } + break; + case 2: + statBits += SI_ID_BITS+SI_CPE_BITS+2*SI_ICS_BITS; + + statBits += SI_CPE_MS_MASK_BITS; + statBits += countMsMaskBits(psyOutChannel[0].sfbCnt, + psyOutChannel[0].sfbPerGroup, + psyOutChannel[0].maxSfbPerGroup, + &psyOutElement->toolsInfo); + + switch (psyOutChannel[0].windowSequence) { + case LONG_WINDOW: + case START_WINDOW: + case STOP_WINDOW: + statBits += SI_ICS_INFO_BITS_LONG; + break; + case SHORT_WINDOW: + statBits += SI_ICS_INFO_BITS_SHORT; + break; + } + for(ch=0; ch<2; ch++) + statBits += countTnsBits(&(psyOutChannel[ch].tnsInfo), + psyOutChannel[ch].windowSequence); + break; + } + + return statBits; +} + |