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Diffstat (limited to 'fdk-aac/libAACenc/src/bandwidth.cpp')
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diff --git a/fdk-aac/libAACenc/src/bandwidth.cpp b/fdk-aac/libAACenc/src/bandwidth.cpp new file mode 100644 index 0000000..36cd64d --- /dev/null +++ b/fdk-aac/libAACenc/src/bandwidth.cpp @@ -0,0 +1,360 @@ +/* ----------------------------------------------------------------------------- +Software License for The Fraunhofer FDK AAC Codec Library for Android + +© Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten +Forschung e.V. All rights reserved. + + 1. INTRODUCTION +The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software +that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding +scheme for digital audio. This FDK AAC Codec software is intended to be used on +a wide variety of Android devices. + +AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient +general perceptual audio codecs. AAC-ELD is considered the best-performing +full-bandwidth communications codec by independent studies and is widely +deployed. AAC has been standardized by ISO and IEC as part of the MPEG +specifications. + +Patent licenses for necessary patent claims for the FDK AAC Codec (including +those of Fraunhofer) may be obtained through Via Licensing +(www.vialicensing.com) or through the respective patent owners individually for +the purpose of encoding or decoding bit streams in products that are compliant +with the ISO/IEC MPEG audio standards. Please note that most manufacturers of +Android devices already license these patent claims through Via Licensing or +directly from the patent owners, and therefore FDK AAC Codec software may +already be covered under those patent licenses when it is used for those +licensed purposes only. + +Commercially-licensed AAC software libraries, including floating-point versions +with enhanced sound quality, are also available from Fraunhofer. Users are +encouraged to check the Fraunhofer website for additional applications +information and documentation. + +2. COPYRIGHT LICENSE + +Redistribution and use in source and binary forms, with or without modification, +are permitted without payment of copyright license fees provided that you +satisfy the following conditions: + +You must retain the complete text of this software license in redistributions of +the FDK AAC Codec or your modifications thereto in source code form. + +You must retain the complete text of this software license in the documentation +and/or other materials provided with redistributions of the FDK AAC Codec or +your modifications thereto in binary form. You must make available free of +charge copies of the complete source code of the FDK AAC Codec and your +modifications thereto to recipients of copies in binary form. + +The name of Fraunhofer may not be used to endorse or promote products derived +from this library without prior written permission. + +You may not charge copyright license fees for anyone to use, copy or distribute +the FDK AAC Codec software or your modifications thereto. + +Your modified versions of the FDK AAC Codec must carry prominent notices stating +that you changed the software and the date of any change. For modified versions +of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android" +must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK +AAC Codec Library for Android." + +3. NO PATENT LICENSE + +NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without +limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE. +Fraunhofer provides no warranty of patent non-infringement with respect to this +software. + +You may use this FDK AAC Codec software or modifications thereto only for +purposes that are authorized by appropriate patent licenses. + +4. DISCLAIMER + +This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright +holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, +including but not limited to the implied warranties of merchantability and +fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR +CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, +or consequential damages, including but not limited to procurement of substitute +goods or services; loss of use, data, or profits, or business interruption, +however caused and on any theory of liability, whether in contract, strict +liability, or tort (including negligence), arising in any way out of the use of +this software, even if advised of the possibility of such damage. + +5. CONTACT INFORMATION + +Fraunhofer Institute for Integrated Circuits IIS +Attention: Audio and Multimedia Departments - FDK AAC LL +Am Wolfsmantel 33 +91058 Erlangen, Germany + +www.iis.fraunhofer.de/amm +amm-info@iis.fraunhofer.de +----------------------------------------------------------------------------- */ + +/**************************** AAC encoder library ****************************** + + Author(s): M. Schug / A. Groeschel + + 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}, {282241, 16000, 16000}}; + +static const BANDWIDTH_TAB bandWidthTable_LD_24000[] = { + {8000, 2000, 2000}, {12000, 2000, 2300}, {16000, 2200, 2500}, + {24000, 5650, 7200}, {32000, 11600, 12000}, {40000, 12000, 16000}, + {48000, 16000, 16000}, {64000, 16000, 16000}, {307201, 16000, 16000}}; + +static const BANDWIDTH_TAB bandWidthTable_LD_32000[] = { + {8000, 2000, 2000}, {12000, 2000, 2000}, {24000, 4250, 7200}, + {32000, 8400, 9000}, {40000, 9400, 11300}, {48000, 11900, 14700}, + {64000, 14800, 16000}, {76000, 16000, 16000}, {409601, 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}, {564481, 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}, {614401, 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 120: + case 128: + case 240: + case 256: + 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 120: + case 128: + case 240: + case 256: + 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( + const INT proposedBandWidth, const INT bitrate, + const AACENC_BITRATE_MODE bitrateMode, const INT sampleRate, + const INT frameLength, const CHANNEL_MAPPING *const cm, + const CHANNEL_MODE encoderMode, INT *const bandWidth) { + AAC_ENCODER_ERROR ErrorStatus = AAC_ENC_OK; + INT chanBitRate = bitrate / cm->nChannelsEff; + + 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_6_1: + case MODE_1_2_2_2_1: + case MODE_7_1_REAR_SURROUND: + case MODE_7_1_FRONT_CENTER: + case MODE_7_1_BACK: + case MODE_7_1_TOP_FRONT: + *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 = fMin(proposedBandWidth, fMin(20000, sampleRate >> 1)); + } else { /* search reasonable bandwidth */ + + int entryNo = 0; + + switch (encoderMode) { + case MODE_1: /* mono */ + entryNo = 0; /* use mono bandwidth 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_6_1: + case MODE_1_2_2_2_1: + case MODE_7_1_REAR_SURROUND: + case MODE_7_1_FRONT_CENTER: + case MODE_7_1_BACK: + case MODE_7_1_TOP_FRONT: + entryNo = 1; /* use stereo bandwidth settings */ + break; + + default: + return AAC_ENC_UNSUPPORTED_CHANNELCONFIG; + } + + *bandWidth = + GetBandwidthEntry(frameLength, sampleRate, chanBitRate, entryNo); + + if (*bandWidth == -1) { + switch (frameLength) { + case 120: + case 128: + case 240: + case 256: + *bandWidth = 16000; + break; + default: + ErrorStatus = AAC_ENC_INVALID_CHANNEL_BITRATE; + } + } + } + break; + default: + *bandWidth = 0; + return AAC_ENC_UNSUPPORTED_BITRATE_MODE; + } + + *bandWidth = fMin(*bandWidth, sampleRate / 2); + + return ErrorStatus; +} |