1 /* 2 ** Copyright 2003-2010, VisualOn, Inc. 3 ** 4 ** Licensed under the Apache License, Version 2.0 (the "License"); 5 ** you may not use this file except in compliance with the License. 6 ** You may obtain a copy of the License at 7 ** 8 ** http://www.apache.org/licenses/LICENSE-2.0 9 ** 10 ** Unless required by applicable law or agreed to in writing, software 11 ** distributed under the License is distributed on an "AS IS" BASIS, 12 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 ** See the License for the specific language governing permissions and 14 ** limitations under the License. 15 */ 16 /******************************************************************************* 17 File: aacenc_core.c 18 19 Content: aac encoder core functions 20 21 *******************************************************************************/ 22 23 #include "typedef.h" 24 #include "aacenc_core.h" 25 #include "bitenc.h" 26 27 #include "psy_configuration.h" 28 #include "psy_main.h" 29 #include "qc_main.h" 30 #include "psy_main.h" 31 #include "channel_map.h" 32 #include "aac_rom.h" 33 34 /******************************************************************************** 35 * 36 * function name: AacInitDefaultConfig 37 * description: gives reasonable default configuration 38 * 39 **********************************************************************************/ 40 void AacInitDefaultConfig(AACENC_CONFIG *config) 41 { 42 /* default configurations */ 43 config->adtsUsed = 1; 44 config->nChannelsIn = 2; 45 config->nChannelsOut = 2; 46 config->bitRate = 128000; 47 config->bandWidth = 0; 48 } 49 50 /******************************************************************************** 51 * 52 * function name: AacEncOpen 53 * description: allocate and initialize a new encoder instance 54 * returns: 0 if success 55 * 56 **********************************************************************************/ 57 Word16 AacEncOpen( AAC_ENCODER* hAacEnc, /* pointer to an encoder handle, initialized on return */ 58 const AACENC_CONFIG config /* pre-initialized config struct */ 59 ) 60 { 61 Word32 error = 0; 62 Word16 profile = 1; 63 64 ELEMENT_INFO *elInfo = NULL; 65 66 if (hAacEnc==0) { 67 error=1; 68 } 69 70 if (!error) { 71 hAacEnc->config = config; 72 } 73 74 if (!error) { 75 error = InitElementInfo (config.nChannelsOut, 76 &hAacEnc->elInfo); 77 } 78 79 if (!error) { 80 elInfo = &hAacEnc->elInfo; 81 } 82 83 if (!error) { 84 /* use or not tns tool for long and short block */ 85 Word16 tnsMask=3; 86 87 /* init encoder psychoacoustic */ 88 error = psyMainInit(&hAacEnc->psyKernel, 89 config.sampleRate, 90 config.bitRate, 91 elInfo->nChannelsInEl, 92 tnsMask, 93 hAacEnc->config.bandWidth); 94 } 95 96 /* use or not adts header */ 97 if(!error) { 98 hAacEnc->qcOut.qcElement.adtsUsed = config.adtsUsed; 99 } 100 101 /* init encoder quantization */ 102 if (!error) { 103 struct QC_INIT qcInit; 104 105 /*qcInit.channelMapping = &hAacEnc->channelMapping;*/ 106 qcInit.elInfo = &hAacEnc->elInfo; 107 108 qcInit.maxBits = (Word16) (MAXBITS_COEF*elInfo->nChannelsInEl); 109 qcInit.bitRes = qcInit.maxBits; 110 qcInit.averageBits = (Word16) ((config.bitRate * FRAME_LEN_LONG) / config.sampleRate); 111 112 qcInit.padding.paddingRest = config.sampleRate; 113 114 qcInit.meanPe = (Word16) ((10 * FRAME_LEN_LONG * hAacEnc->config.bandWidth) / 115 (config.sampleRate>>1)); 116 117 qcInit.maxBitFac = (Word16) ((100 * (MAXBITS_COEF-MINBITS_COEF)* elInfo->nChannelsInEl)/ 118 (qcInit.averageBits?qcInit.averageBits:1)); 119 120 qcInit.bitrate = config.bitRate; 121 122 error = QCInit(&hAacEnc->qcKernel, &qcInit); 123 } 124 125 /* init bitstream encoder */ 126 if (!error) { 127 hAacEnc->bseInit.nChannels = elInfo->nChannelsInEl; 128 hAacEnc->bseInit.bitrate = config.bitRate; 129 hAacEnc->bseInit.sampleRate = config.sampleRate; 130 hAacEnc->bseInit.profile = profile; 131 } 132 133 return error; 134 } 135 136 /******************************************************************************** 137 * 138 * function name: AacEncEncode 139 * description: encode pcm to aac data core function 140 * returns: 0 if success 141 * 142 **********************************************************************************/ 143 Word16 AacEncEncode(AAC_ENCODER *aacEnc, /*!< an encoder handle */ 144 Word16 *timeSignal, /*!< BLOCKSIZE*nChannels audio samples, interleaved */ 145 const UWord8 *ancBytes, /*!< pointer to ancillary data bytes */ 146 Word16 *numAncBytes, /*!< number of ancillary Data Bytes */ 147 UWord8 *outBytes, /*!< pointer to output buffer (must be large MINBITS_COEF/8*MAX_CHANNELS bytes) */ 148 VO_U32 *numOutBytes /*!< number of bytes in output buffer after processing */ 149 ) 150 { 151 ELEMENT_INFO *elInfo = &aacEnc->elInfo; 152 Word16 globUsedBits; 153 Word16 ancDataBytes, ancDataBytesLeft; 154 155 ancDataBytes = ancDataBytesLeft = *numAncBytes; 156 157 /* init output aac data buffer and length */ 158 aacEnc->hBitStream = CreateBitBuffer(&aacEnc->bitStream, outBytes, *numOutBytes); 159 160 /* psychoacoustic process */ 161 psyMain(aacEnc->config.nChannelsOut, 162 elInfo, 163 timeSignal, 164 &aacEnc->psyKernel.psyData[elInfo->ChannelIndex[0]], 165 &aacEnc->psyKernel.tnsData[elInfo->ChannelIndex[0]], 166 &aacEnc->psyKernel.psyConfLong, 167 &aacEnc->psyKernel.psyConfShort, 168 &aacEnc->psyOut.psyOutChannel[elInfo->ChannelIndex[0]], 169 &aacEnc->psyOut.psyOutElement, 170 aacEnc->psyKernel.pScratchTns, 171 aacEnc->config.sampleRate); 172 173 /* adjust bitrate and frame length */ 174 AdjustBitrate(&aacEnc->qcKernel, 175 aacEnc->config.bitRate, 176 aacEnc->config.sampleRate); 177 178 /* quantization and coding process */ 179 QCMain(&aacEnc->qcKernel, 180 &aacEnc->qcKernel.elementBits, 181 &aacEnc->qcKernel.adjThr.adjThrStateElem, 182 &aacEnc->psyOut.psyOutChannel[elInfo->ChannelIndex[0]], 183 &aacEnc->psyOut.psyOutElement, 184 &aacEnc->qcOut.qcChannel[elInfo->ChannelIndex[0]], 185 &aacEnc->qcOut.qcElement, 186 elInfo->nChannelsInEl, 187 min(ancDataBytesLeft,ancDataBytes)); 188 189 ancDataBytesLeft = ancDataBytesLeft - ancDataBytes; 190 191 globUsedBits = FinalizeBitConsumption(&aacEnc->qcKernel, 192 &aacEnc->qcOut); 193 194 /* write bitstream process */ 195 WriteBitstream(aacEnc->hBitStream, 196 *elInfo, 197 &aacEnc->qcOut, 198 &aacEnc->psyOut, 199 &globUsedBits, 200 ancBytes, 201 aacEnc->psyKernel.sampleRateIdx); 202 203 updateBitres(&aacEnc->qcKernel, 204 &aacEnc->qcOut); 205 206 /* write out the bitstream */ 207 *numOutBytes = GetBitsAvail(aacEnc->hBitStream) >> 3; 208 209 return 0; 210 } 211 212 213 /******************************************************************************** 214 * 215 * function name:AacEncClose 216 * description: deallocate an encoder instance 217 * 218 **********************************************************************************/ 219 void AacEncClose (AAC_ENCODER* hAacEnc, VO_MEM_OPERATOR *pMemOP) 220 { 221 if (hAacEnc) { 222 QCDelete(&hAacEnc->qcKernel, pMemOP); 223 224 QCOutDelete(&hAacEnc->qcOut, pMemOP); 225 226 PsyDelete(&hAacEnc->psyKernel, pMemOP); 227 228 PsyOutDelete(&hAacEnc->psyOut, pMemOP); 229 230 DeleteBitBuffer(&hAacEnc->hBitStream); 231 232 if(hAacEnc->intbuf) 233 { 234 mem_free(pMemOP, hAacEnc->intbuf, VO_INDEX_ENC_AAC); 235 hAacEnc->intbuf = NULL; 236 } 237 } 238 } 239
