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Diffstat (limited to 'libAACenc/src/bandwidth.cpp')
| -rw-r--r-- | libAACenc/src/bandwidth.cpp | 316 |
1 files changed, 316 insertions, 0 deletions
diff --git a/libAACenc/src/bandwidth.cpp b/libAACenc/src/bandwidth.cpp new file mode 100644 index 0000000..51c3a33 --- /dev/null +++ b/libAACenc/src/bandwidth.cpp @@ -0,0 +1,316 @@ +/************************* Fast MPEG AAC Audio Encoder ********************** + + (C) Copyright Fraunhofer IIS (1999) + 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: M. Schug / A. Groeschel + contents/description: bandwidth expert + +******************************************************************************/ + +#include "channel_map.h" +#include "bandwidth.h" +#include "aacEnc_ram.h" + +typedef struct{ + INT chanBitRate; + INT bandWidthMono; + INT bandWidth2AndMoreChan; + +} BANDWIDTH_TAB; + +static const BANDWIDTH_TAB bandWidthTable[] = { + {0, 3700, 5000}, + {12000, 5000, 6400}, + {20000, 6900, 9640}, + {28000, 9600, 13050}, + {40000, 12060, 14260}, + {56000, 13950, 15500}, + {72000, 14200, 16120}, + {96000, 17000, 17000}, + {576001,17000, 17000} +}; + + +static const BANDWIDTH_TAB bandWidthTable_LD_22050[] = { + { 8000, 2000, 2400}, + {12000, 2500, 2700}, + {16000, 3300, 3100}, + {24000, 6250, 7200}, + {32000, 9200, 10500}, + {40000, 16000, 16000}, + {48000, 16000, 16000}, + {360001, 16000, 16000} +}; + +static const BANDWIDTH_TAB bandWidthTable_LD_24000[] = { + { 8000, 2000, 2000}, + {12000, 2000, 2300}, + {16000, 2200, 2500}, + {24000, 5650, 6400}, + {32000, 11600, 12000}, + {40000, 12000, 16000}, + {48000, 16000, 16000}, + {64000, 16000, 16000}, + {360001, 16000, 16000} +}; + +static const BANDWIDTH_TAB bandWidthTable_LD_32000[] = { + { 8000, 2000, 2000}, + {12000, 2000, 2000}, + {24000, 4250, 5200}, + {32000, 8400, 9000}, + {40000, 9400, 11300}, + {48000, 11900, 13700}, + {64000, 14800, 16000}, + {76000, 16000, 16000}, + {360001, 16000, 16000} +}; + +static const BANDWIDTH_TAB bandWidthTable_LD_44100[] = { + { 8000, 2000, 2000}, + {24000, 2000, 2000}, + {32000, 4400, 5700}, + {40000, 7400, 8800}, + {48000, 9000, 10700}, + {56000, 11000, 12900}, + {64000, 14400, 15500}, + {80000, 16000, 16200}, + {96000, 16500, 16000}, + {128000, 16000, 16000}, + {360001, 16000, 16000} +}; + +static const BANDWIDTH_TAB bandWidthTable_LD_48000[] = { + { 8000, 2000, 2000}, + {24000, 2000, 2000}, + {32000, 4400, 5700}, + {40000, 7400, 8800}, + {48000, 9000, 10700}, + {56000, 11000, 12800}, + {64000, 14300, 15400}, + {80000, 16000, 16200}, + {96000, 16500, 16000}, + {128000, 16000, 16000}, + {360001, 16000, 16000} +}; + +typedef struct{ + AACENC_BITRATE_MODE bitrateMode; + int bandWidthMono; + int bandWidth2AndMoreChan; +} BANDWIDTH_TAB_VBR; + +static const BANDWIDTH_TAB_VBR bandWidthTableVBR[]= { + {AACENC_BR_MODE_CBR, 0, 0}, + {AACENC_BR_MODE_VBR_1, 13050, 13050}, + {AACENC_BR_MODE_VBR_2, 13050, 13050}, + {AACENC_BR_MODE_VBR_3, 14260, 14260}, + {AACENC_BR_MODE_VBR_4, 15500, 15500}, + {AACENC_BR_MODE_VBR_5, 48000, 48000}, + {AACENC_BR_MODE_SFR, 0, 0}, + {AACENC_BR_MODE_FF, 0, 0} + +}; + +static INT GetBandwidthEntry( + const INT frameLength, + const INT sampleRate, + const INT chanBitRate, + const INT entryNo) +{ + INT bandwidth = -1; + const BANDWIDTH_TAB *pBwTab = NULL; + INT bwTabSize = 0; + + switch (frameLength) { + case 960: + case 1024: + pBwTab = bandWidthTable; + bwTabSize = sizeof(bandWidthTable)/sizeof(BANDWIDTH_TAB); + break; + case 480: + case 512: + switch (sampleRate) { + case 8000: + case 11025: + case 12000: + case 16000: + case 22050: + pBwTab = bandWidthTable_LD_22050; + bwTabSize = sizeof(bandWidthTable_LD_22050)/sizeof(BANDWIDTH_TAB); + break; + case 24000: + pBwTab = bandWidthTable_LD_24000; + bwTabSize = sizeof(bandWidthTable_LD_24000)/sizeof(BANDWIDTH_TAB); + break; + case 32000: + pBwTab = bandWidthTable_LD_32000; + bwTabSize = sizeof(bandWidthTable_LD_32000)/sizeof(BANDWIDTH_TAB); + break; + case (44100): + pBwTab = bandWidthTable_LD_44100; + bwTabSize = sizeof(bandWidthTable_LD_44100)/sizeof(BANDWIDTH_TAB); + break; + case 48000: + case 64000: + case 88200: + case 96000: + pBwTab = bandWidthTable_LD_48000; + bwTabSize = sizeof(bandWidthTable_LD_48000)/sizeof(BANDWIDTH_TAB); + break; + } + break; + default: + pBwTab = NULL; + bwTabSize = 0; + } + + if (pBwTab!=NULL) { + int i; + for (i=0; i<bwTabSize-1; i++) { + if (chanBitRate >= pBwTab[i].chanBitRate && + chanBitRate < pBwTab[i+1].chanBitRate) + { + switch (frameLength) { + case 960: + case 1024: + bandwidth = (entryNo==0) + ? pBwTab[i].bandWidthMono + : pBwTab[i].bandWidth2AndMoreChan; + break; + case 480: + case 512: + { + INT q_res = 0; + INT startBw = (entryNo==0) ? pBwTab[i ].bandWidthMono : pBwTab[i ].bandWidth2AndMoreChan; + INT endBw = (entryNo==0) ? pBwTab[i+1].bandWidthMono : pBwTab[i+1].bandWidth2AndMoreChan; + INT startBr = pBwTab[i].chanBitRate; + INT endBr = pBwTab[i+1].chanBitRate; + + FIXP_DBL bwFac_fix = fDivNorm(chanBitRate-startBr, endBr-startBr, &q_res); + bandwidth = (INT)scaleValue(fMult(bwFac_fix, (FIXP_DBL)(endBw-startBw)),q_res) + startBw; + } + break; + default: + bandwidth = -1; + } + break; + } /* within bitrate range */ + } + } /* pBwTab!=NULL */ + + return bandwidth; +} + + +AAC_ENCODER_ERROR FDKaacEnc_DetermineBandWidth(INT* bandWidth, + INT proposedBandWidth, + INT bitrate, + AACENC_BITRATE_MODE bitrateMode, + INT sampleRate, + INT frameLength, + CHANNEL_MAPPING* cm, + CHANNEL_MODE encoderMode) +{ + AAC_ENCODER_ERROR ErrorStatus = AAC_ENC_OK; + //FIXP_DBL invBandWidthGain=FL2FXCONST_DBL(1.f); + INT chanBitRate = bitrate/cm->nChannels; + + /* vbr */ + switch(bitrateMode){ + case AACENC_BR_MODE_VBR_1: + case AACENC_BR_MODE_VBR_2: + case AACENC_BR_MODE_VBR_3: + case AACENC_BR_MODE_VBR_4: + case AACENC_BR_MODE_VBR_5: + if (proposedBandWidth != 0){ + /* use given bw */ + *bandWidth = proposedBandWidth; + } else { + /* take bw from table */ + switch(encoderMode){ + case MODE_1: + *bandWidth = bandWidthTableVBR[bitrateMode].bandWidthMono; + break; + case MODE_2: + 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: + *bandWidth = bandWidthTableVBR[bitrateMode].bandWidth2AndMoreChan; + break; + default: + return AAC_ENC_UNSUPPORTED_CHANNELCONFIG; + } + } + break; + case AACENC_BR_MODE_CBR: + case AACENC_BR_MODE_SFR: + case AACENC_BR_MODE_FF: + + /* bandwidth limiting */ + if (proposedBandWidth != 0) { + *bandWidth = FDKmin(proposedBandWidth, FDKmin(20000, sampleRate>>1)); + } + else { /* search reasonable bandwidth */ + + int entryNo = 0; + + switch(encoderMode){ + case MODE_1: /* mono */ + entryNo = 0; /* use mono bandwith settings */ + break; + + case MODE_2: /* stereo */ + case MODE_1_2: /* sce + cpe */ + case MODE_1_2_1: /* sce + cpe + sce */ + case MODE_1_2_2: /* sce + cpe + cpe */ + case MODE_1_2_2_1: /* (5.1) sce + cpe + cpe + lfe */ + case MODE_1_2_2_2_1: /* (7.1) sce + cpe + cpe + cpe + lfe */ + entryNo = 1; /* use stereo bandwith settings */ + break; + + default: + return AAC_ENC_UNSUPPORTED_CHANNELCONFIG; + } + + *bandWidth = GetBandwidthEntry( + frameLength, + sampleRate, + chanBitRate, + entryNo); + + if (*bandWidth==-1) { + ErrorStatus = AAC_ENC_INVALID_CHANNEL_BITRATE; + } + } + break; + default: + *bandWidth = 0; + return AAC_ENC_UNSUPPORTED_BITRATE_MODE; + } + + *bandWidth = FDKmin(*bandWidth, sampleRate/2); + + return ErrorStatus;; +} |