| /* ----------------------------------------------------------------------------- |
| 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): A. Groeschel |
| |
| Description: channel mapping functionality |
| |
| *******************************************************************************/ |
| |
| #include "channel_map.h" |
| #include "bitenc.h" |
| #include "psy_const.h" |
| #include "qc_data.h" |
| #include "aacEnc_ram.h" |
| #include "FDK_tools_rom.h" |
| |
| /* channel_assignment treats the relationship of Input file channels |
| to the encoder channels. |
| This is necessary because the usual order in RIFF files (.wav) |
| is different from the elements order in the coder given |
| by Table 8.1 (implicit speaker mapping) of the AAC standard. |
| |
| In mono and stereo case, this is trivial. |
| In mc case, it looks like this: |
| |
| Channel Input file coder chan |
| 5ch: |
| front center 2 0 (SCE channel) |
| left center 0 1 (1st of 1st CPE) |
| right center 1 2 (2nd of 1st CPE) |
| left surround 3 3 (1st of 2nd CPE) |
| right surround 4 4 (2nd of 2nd CPE) |
| |
| 5.1ch: |
| front center 2 0 (SCE channel) |
| left center 0 1 (1st of 1st CPE) |
| right center 1 2 (2nd of 1st CPE) |
| left surround 4 3 (1st of 2nd CPE) |
| right surround 5 4 (2nd of 2nd CPE) |
| LFE 3 5 (LFE) |
| */ |
| |
| /* Channel mode configuration tab provides, |
| corresponding number of channels and elements |
| */ |
| static const CHANNEL_MODE_CONFIG_TAB channelModeConfig[] = { |
| {MODE_1, 1, 1, 1}, /* chCfg 1, SCE */ |
| {MODE_2, 2, 2, 1}, /* chCfg 2, CPE */ |
| {MODE_1_2, 3, 3, 2}, /* chCfg 3, SCE,CPE */ |
| {MODE_1_2_1, 4, 4, 3}, /* chCfg 4, SCE,CPE,SCE */ |
| {MODE_1_2_2, 5, 5, 3}, /* chCfg 5, SCE,CPE,CPE */ |
| {MODE_1_2_2_1, 6, 5, 4}, /* chCfg 6, SCE,CPE,CPE,LFE */ |
| {MODE_1_2_2_2_1, 8, 7, 5}, /* chCfg 7, SCE,CPE,CPE,CPE,LFE */ |
| {MODE_6_1, 7, 6, 5}, /* chCfg 11, SCE,CPE,CPE,SCE,LFE */ |
| {MODE_7_1_BACK, 8, 7, 5}, /* chCfg 12, SCE,CPE,CPE,CPE,LFE */ |
| {MODE_7_1_TOP_FRONT, 8, 7, 5}, /* chCfg 14, SCE,CPE,CPE,LFE,CPE */ |
| {MODE_7_1_REAR_SURROUND, 8, 7, |
| 5}, /* same as MODE_7_1_BACK, SCE,CPE,CPE,CPE,LFE */ |
| {MODE_7_1_FRONT_CENTER, 8, 7, |
| 5}, /* same as MODE_1_2_2_2_1, SCE,CPE,CPE,CPE,LFE */ |
| |
| }; |
| |
| AAC_ENCODER_ERROR FDKaacEnc_DetermineEncoderMode(CHANNEL_MODE* mode, |
| INT nChannels) { |
| INT i; |
| CHANNEL_MODE encMode = MODE_INVALID; |
| |
| if (*mode == MODE_UNKNOWN) { |
| for (i = 0; i < (INT)sizeof(channelModeConfig) / |
| (INT)sizeof(CHANNEL_MODE_CONFIG_TAB); |
| i++) { |
| if (channelModeConfig[i].nChannels == nChannels) { |
| encMode = channelModeConfig[i].encMode; |
| break; |
| } |
| } |
| *mode = encMode; |
| } else { |
| /* check if valid channel configuration */ |
| if (FDKaacEnc_GetChannelModeConfiguration(*mode)->nChannels == nChannels) { |
| encMode = *mode; |
| } |
| } |
| |
| if (encMode == MODE_INVALID) { |
| return AAC_ENC_UNSUPPORTED_CHANNELCONFIG; |
| } |
| |
| return AAC_ENC_OK; |
| } |
| |
| static INT FDKaacEnc_initElement(ELEMENT_INFO* elInfo, MP4_ELEMENT_ID elType, |
| INT* cnt, FDK_channelMapDescr* mapDescr, |
| UINT mapIdx, INT* it_cnt, |
| const FIXP_DBL relBits) { |
| INT error = 0; |
| INT counter = *cnt; |
| |
| elInfo->elType = elType; |
| elInfo->relativeBits = relBits; |
| |
| switch (elInfo->elType) { |
| case ID_SCE: |
| case ID_LFE: |
| case ID_CCE: |
| elInfo->nChannelsInEl = 1; |
| elInfo->ChannelIndex[0] = |
| FDK_chMapDescr_getMapValue(mapDescr, counter++, mapIdx); |
| elInfo->instanceTag = it_cnt[elType]++; |
| break; |
| case ID_CPE: |
| elInfo->nChannelsInEl = 2; |
| elInfo->ChannelIndex[0] = |
| FDK_chMapDescr_getMapValue(mapDescr, counter++, mapIdx); |
| elInfo->ChannelIndex[1] = |
| FDK_chMapDescr_getMapValue(mapDescr, counter++, mapIdx); |
| elInfo->instanceTag = it_cnt[elType]++; |
| break; |
| case ID_DSE: |
| elInfo->nChannelsInEl = 0; |
| elInfo->ChannelIndex[0] = 0; |
| elInfo->ChannelIndex[1] = 0; |
| elInfo->instanceTag = it_cnt[elType]++; |
| break; |
| default: |
| error = 1; |
| }; |
| *cnt = counter; |
| return error; |
| } |
| |
| AAC_ENCODER_ERROR FDKaacEnc_InitChannelMapping(CHANNEL_MODE mode, |
| CHANNEL_ORDER co, |
| CHANNEL_MAPPING* cm) { |
| INT count = 0; /* count through coder channels */ |
| INT it_cnt[ID_END + 1]; |
| INT i; |
| UINT mapIdx; |
| FDK_channelMapDescr mapDescr; |
| |
| for (i = 0; i < ID_END; i++) it_cnt[i] = 0; |
| |
| FDKmemclear(cm, sizeof(CHANNEL_MAPPING)); |
| |
| /* init channel mapping*/ |
| for (i = 0; i < (INT)sizeof(channelModeConfig) / |
| (INT)sizeof(CHANNEL_MODE_CONFIG_TAB); |
| i++) { |
| if (channelModeConfig[i].encMode == mode) { |
| cm->encMode = channelModeConfig[i].encMode; |
| cm->nChannels = channelModeConfig[i].nChannels; |
| cm->nChannelsEff = channelModeConfig[i].nChannelsEff; |
| cm->nElements = channelModeConfig[i].nElements; |
| |
| break; |
| } |
| } |
| |
| /* init map descriptor */ |
| FDK_chMapDescr_init(&mapDescr, NULL, 0, (co == CH_ORDER_MPEG) ? 1 : 0); |
| switch (mode) { |
| case MODE_7_1_REAR_SURROUND: /* MODE_7_1_REAR_SURROUND is equivalent to |
| MODE_7_1_BACK */ |
| mapIdx = (INT)MODE_7_1_BACK; |
| break; |
| case MODE_7_1_FRONT_CENTER: /* MODE_7_1_FRONT_CENTER is equivalent to |
| MODE_1_2_2_2_1 */ |
| mapIdx = (INT)MODE_1_2_2_2_1; |
| break; |
| default: |
| mapIdx = |
| (INT)mode > 14 |
| ? 0 |
| : (INT) |
| mode; /* if channel config > 14 MPEG mapping will be used */ |
| } |
| |
| /* init element info struct */ |
| switch (mode) { |
| case MODE_1: |
| /* (mono) sce */ |
| FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, &mapDescr, mapIdx, |
| it_cnt, (FIXP_DBL)MAXVAL_DBL); |
| break; |
| case MODE_2: |
| /* (stereo) cpe */ |
| FDKaacEnc_initElement(&cm->elInfo[0], ID_CPE, &count, &mapDescr, mapIdx, |
| it_cnt, (FIXP_DBL)MAXVAL_DBL); |
| break; |
| |
| case MODE_1_2: |
| /* sce + cpe */ |
| FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, &mapDescr, mapIdx, |
| it_cnt, FL2FXCONST_DBL(0.4f)); |
| FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, &mapDescr, mapIdx, |
| it_cnt, FL2FXCONST_DBL(0.6f)); |
| break; |
| |
| case MODE_1_2_1: |
| /* sce + cpe + sce */ |
| FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, &mapDescr, mapIdx, |
| it_cnt, FL2FXCONST_DBL(0.3f)); |
| FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, &mapDescr, mapIdx, |
| it_cnt, FL2FXCONST_DBL(0.4f)); |
| FDKaacEnc_initElement(&cm->elInfo[2], ID_SCE, &count, &mapDescr, mapIdx, |
| it_cnt, FL2FXCONST_DBL(0.3f)); |
| break; |
| |
| case MODE_1_2_2: |
| /* sce + cpe + cpe */ |
| FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, &mapDescr, mapIdx, |
| it_cnt, FL2FXCONST_DBL(0.26f)); |
| FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, &mapDescr, mapIdx, |
| it_cnt, FL2FXCONST_DBL(0.37f)); |
| FDKaacEnc_initElement(&cm->elInfo[2], ID_CPE, &count, &mapDescr, mapIdx, |
| it_cnt, FL2FXCONST_DBL(0.37f)); |
| break; |
| |
| case MODE_1_2_2_1: |
| /* (5.1) sce + cpe + cpe + lfe */ |
| FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, &mapDescr, mapIdx, |
| it_cnt, FL2FXCONST_DBL(0.24f)); |
| FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, &mapDescr, mapIdx, |
| it_cnt, FL2FXCONST_DBL(0.35f)); |
| FDKaacEnc_initElement(&cm->elInfo[2], ID_CPE, &count, &mapDescr, mapIdx, |
| it_cnt, FL2FXCONST_DBL(0.35f)); |
| FDKaacEnc_initElement(&cm->elInfo[3], ID_LFE, &count, &mapDescr, mapIdx, |
| it_cnt, FL2FXCONST_DBL(0.06f)); |
| break; |
| |
| case MODE_6_1: |
| /* (6.1) sce + cpe + cpe + sce + lfe */ |
| FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, &mapDescr, mapIdx, |
| it_cnt, FL2FXCONST_DBL(0.2f)); |
| FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, &mapDescr, mapIdx, |
| it_cnt, FL2FXCONST_DBL(0.275f)); |
| FDKaacEnc_initElement(&cm->elInfo[2], ID_CPE, &count, &mapDescr, mapIdx, |
| it_cnt, FL2FXCONST_DBL(0.275f)); |
| FDKaacEnc_initElement(&cm->elInfo[3], ID_SCE, &count, &mapDescr, mapIdx, |
| it_cnt, FL2FXCONST_DBL(0.2f)); |
| FDKaacEnc_initElement(&cm->elInfo[4], ID_LFE, &count, &mapDescr, mapIdx, |
| it_cnt, FL2FXCONST_DBL(0.05f)); |
| break; |
| |
| case MODE_1_2_2_2_1: |
| case MODE_7_1_BACK: |
| case MODE_7_1_TOP_FRONT: |
| case MODE_7_1_REAR_SURROUND: |
| case MODE_7_1_FRONT_CENTER: { |
| /* (7.1) sce + cpe + cpe + cpe + lfe */ |
| /* (7.1 top) sce + cpe + cpe + lfe + cpe */ |
| |
| FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, &mapDescr, mapIdx, |
| it_cnt, FL2FXCONST_DBL(0.18f)); |
| FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, &mapDescr, mapIdx, |
| it_cnt, FL2FXCONST_DBL(0.26f)); |
| FDKaacEnc_initElement(&cm->elInfo[2], ID_CPE, &count, &mapDescr, mapIdx, |
| it_cnt, FL2FXCONST_DBL(0.26f)); |
| if (mode != MODE_7_1_TOP_FRONT) { |
| FDKaacEnc_initElement(&cm->elInfo[3], ID_CPE, &count, &mapDescr, mapIdx, |
| it_cnt, FL2FXCONST_DBL(0.26f)); |
| FDKaacEnc_initElement(&cm->elInfo[4], ID_LFE, &count, &mapDescr, mapIdx, |
| it_cnt, FL2FXCONST_DBL(0.04f)); |
| } else { |
| FDKaacEnc_initElement(&cm->elInfo[3], ID_LFE, &count, &mapDescr, mapIdx, |
| it_cnt, FL2FXCONST_DBL(0.04f)); |
| FDKaacEnc_initElement(&cm->elInfo[4], ID_CPE, &count, &mapDescr, mapIdx, |
| it_cnt, FL2FXCONST_DBL(0.26f)); |
| } |
| break; |
| } |
| |
| default: |
| //*chMap=0; |
| return AAC_ENC_UNSUPPORTED_CHANNELCONFIG; |
| }; |
| |
| FDK_ASSERT(cm->nElements <= ((8))); |
| |
| return AAC_ENC_OK; |
| } |
| |
| AAC_ENCODER_ERROR FDKaacEnc_InitElementBits(QC_STATE* hQC, CHANNEL_MAPPING* cm, |
| INT bitrateTot, INT averageBitsTot, |
| INT maxChannelBits) { |
| int sc_brTot = CountLeadingBits(bitrateTot); |
| |
| switch (cm->encMode) { |
| case MODE_1: |
| hQC->elementBits[0]->chBitrateEl = bitrateTot; |
| |
| hQC->elementBits[0]->maxBitsEl = maxChannelBits; |
| |
| hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits; |
| break; |
| |
| case MODE_2: |
| hQC->elementBits[0]->chBitrateEl = bitrateTot >> 1; |
| |
| hQC->elementBits[0]->maxBitsEl = 2 * maxChannelBits; |
| |
| hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits; |
| break; |
| case MODE_1_2: { |
| hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits; |
| hQC->elementBits[1]->relativeBitsEl = cm->elInfo[1].relativeBits; |
| FIXP_DBL sceRate = cm->elInfo[0].relativeBits; |
| FIXP_DBL cpeRate = cm->elInfo[1].relativeBits; |
| |
| hQC->elementBits[0]->chBitrateEl = |
| fMult(sceRate, (FIXP_DBL)(bitrateTot << sc_brTot)) >> sc_brTot; |
| hQC->elementBits[1]->chBitrateEl = |
| fMult(cpeRate, (FIXP_DBL)(bitrateTot << sc_brTot)) >> (sc_brTot + 1); |
| |
| hQC->elementBits[0]->maxBitsEl = maxChannelBits; |
| hQC->elementBits[1]->maxBitsEl = 2 * maxChannelBits; |
| break; |
| } |
| case MODE_1_2_1: { |
| /* sce + cpe + sce */ |
| hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits; |
| hQC->elementBits[1]->relativeBitsEl = cm->elInfo[1].relativeBits; |
| hQC->elementBits[2]->relativeBitsEl = cm->elInfo[2].relativeBits; |
| FIXP_DBL sce1Rate = cm->elInfo[0].relativeBits; |
| FIXP_DBL cpeRate = cm->elInfo[1].relativeBits; |
| FIXP_DBL sce2Rate = cm->elInfo[2].relativeBits; |
| |
| hQC->elementBits[0]->chBitrateEl = |
| fMult(sce1Rate, (FIXP_DBL)(bitrateTot << sc_brTot)) >> sc_brTot; |
| hQC->elementBits[1]->chBitrateEl = |
| fMult(cpeRate, (FIXP_DBL)(bitrateTot << sc_brTot)) >> (sc_brTot + 1); |
| hQC->elementBits[2]->chBitrateEl = |
| fMult(sce2Rate, (FIXP_DBL)(bitrateTot << sc_brTot)) >> sc_brTot; |
| |
| hQC->elementBits[0]->maxBitsEl = maxChannelBits; |
| hQC->elementBits[1]->maxBitsEl = 2 * maxChannelBits; |
| hQC->elementBits[2]->maxBitsEl = maxChannelBits; |
| break; |
| } |
| case MODE_1_2_2: { |
| /* sce + cpe + cpe */ |
| hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits; |
| hQC->elementBits[1]->relativeBitsEl = cm->elInfo[1].relativeBits; |
| hQC->elementBits[2]->relativeBitsEl = cm->elInfo[2].relativeBits; |
| FIXP_DBL sceRate = cm->elInfo[0].relativeBits; |
| FIXP_DBL cpe1Rate = cm->elInfo[1].relativeBits; |
| FIXP_DBL cpe2Rate = cm->elInfo[2].relativeBits; |
| |
| hQC->elementBits[0]->chBitrateEl = |
| fMult(sceRate, (FIXP_DBL)(bitrateTot << sc_brTot)) >> sc_brTot; |
| hQC->elementBits[1]->chBitrateEl = |
| fMult(cpe1Rate, (FIXP_DBL)(bitrateTot << sc_brTot)) >> (sc_brTot + 1); |
| hQC->elementBits[2]->chBitrateEl = |
| fMult(cpe2Rate, (FIXP_DBL)(bitrateTot << sc_brTot)) >> (sc_brTot + 1); |
| |
| hQC->elementBits[0]->maxBitsEl = maxChannelBits; |
| hQC->elementBits[1]->maxBitsEl = 2 * maxChannelBits; |
| hQC->elementBits[2]->maxBitsEl = 2 * maxChannelBits; |
| break; |
| } |
| case MODE_1_2_2_1: { |
| /* (5.1) sce + cpe + cpe + lfe */ |
| hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits; |
| hQC->elementBits[1]->relativeBitsEl = cm->elInfo[1].relativeBits; |
| hQC->elementBits[2]->relativeBitsEl = cm->elInfo[2].relativeBits; |
| hQC->elementBits[3]->relativeBitsEl = cm->elInfo[3].relativeBits; |
| FIXP_DBL sceRate = cm->elInfo[0].relativeBits; |
| FIXP_DBL cpe1Rate = cm->elInfo[1].relativeBits; |
| FIXP_DBL cpe2Rate = cm->elInfo[2].relativeBits; |
| FIXP_DBL lfeRate = cm->elInfo[3].relativeBits; |
| |
| int maxBitsTot = |
| maxChannelBits * 5; /* LFE does not add to bit reservoir */ |
| int sc = CountLeadingBits(fixMax(maxChannelBits, averageBitsTot)); |
| int maxLfeBits = (int)fMax( |
| (INT)((fMult(lfeRate, (FIXP_DBL)(maxChannelBits << sc)) >> sc) << 1), |
| (INT)((fMult(FL2FXCONST_DBL(1.1f / 2.f), |
| fMult(lfeRate, (FIXP_DBL)(averageBitsTot << sc))) |
| << 1) >> |
| sc)); |
| |
| maxChannelBits = (maxBitsTot - maxLfeBits); |
| sc = CountLeadingBits(maxChannelBits); |
| |
| maxChannelBits = |
| fMult((FIXP_DBL)maxChannelBits << sc, GetInvInt(5)) >> sc; |
| |
| hQC->elementBits[0]->chBitrateEl = |
| fMult(sceRate, (FIXP_DBL)(bitrateTot << sc_brTot)) >> sc_brTot; |
| hQC->elementBits[1]->chBitrateEl = |
| fMult(cpe1Rate, (FIXP_DBL)(bitrateTot << sc_brTot)) >> (sc_brTot + 1); |
| hQC->elementBits[2]->chBitrateEl = |
| fMult(cpe2Rate, (FIXP_DBL)(bitrateTot << sc_brTot)) >> (sc_brTot + 1); |
| hQC->elementBits[3]->chBitrateEl = |
| fMult(lfeRate, (FIXP_DBL)(bitrateTot << sc_brTot)) >> sc_brTot; |
| |
| hQC->elementBits[0]->maxBitsEl = maxChannelBits; |
| hQC->elementBits[1]->maxBitsEl = 2 * maxChannelBits; |
| hQC->elementBits[2]->maxBitsEl = 2 * maxChannelBits; |
| hQC->elementBits[3]->maxBitsEl = maxLfeBits; |
| |
| break; |
| } |
| case MODE_6_1: { |
| /* (6.1) sce + cpe + cpe + sce + lfe */ |
| FIXP_DBL sceRate = hQC->elementBits[0]->relativeBitsEl = |
| cm->elInfo[0].relativeBits; |
| FIXP_DBL cpe1Rate = hQC->elementBits[1]->relativeBitsEl = |
| cm->elInfo[1].relativeBits; |
| FIXP_DBL cpe2Rate = hQC->elementBits[2]->relativeBitsEl = |
| cm->elInfo[2].relativeBits; |
| FIXP_DBL sce2Rate = hQC->elementBits[3]->relativeBitsEl = |
| cm->elInfo[3].relativeBits; |
| FIXP_DBL lfeRate = hQC->elementBits[4]->relativeBitsEl = |
| cm->elInfo[4].relativeBits; |
| |
| int maxBitsTot = |
| maxChannelBits * 6; /* LFE does not add to bit reservoir */ |
| int sc = CountLeadingBits(fixMax(maxChannelBits, averageBitsTot)); |
| int maxLfeBits = (int)fMax( |
| (INT)((fMult(lfeRate, (FIXP_DBL)(maxChannelBits << sc)) >> sc) << 1), |
| (INT)((fMult(FL2FXCONST_DBL(1.1f / 2.f), |
| fMult(lfeRate, (FIXP_DBL)(averageBitsTot << sc))) |
| << 1) >> |
| sc)); |
| |
| maxChannelBits = (maxBitsTot - maxLfeBits) / 6; |
| |
| hQC->elementBits[0]->chBitrateEl = |
| fMult(sceRate, (FIXP_DBL)(bitrateTot << sc_brTot)) >> sc_brTot; |
| hQC->elementBits[1]->chBitrateEl = |
| fMult(cpe1Rate, (FIXP_DBL)(bitrateTot << sc_brTot)) >> (sc_brTot + 1); |
| hQC->elementBits[2]->chBitrateEl = |
| fMult(cpe2Rate, (FIXP_DBL)(bitrateTot << sc_brTot)) >> (sc_brTot + 1); |
| hQC->elementBits[3]->chBitrateEl = |
| fMult(sce2Rate, (FIXP_DBL)(bitrateTot << sc_brTot)) >> (sc_brTot + 1); |
| hQC->elementBits[4]->chBitrateEl = |
| fMult(lfeRate, (FIXP_DBL)(bitrateTot << sc_brTot)) >> sc_brTot; |
| |
| hQC->elementBits[0]->maxBitsEl = maxChannelBits; |
| hQC->elementBits[1]->maxBitsEl = 2 * maxChannelBits; |
| hQC->elementBits[2]->maxBitsEl = 2 * maxChannelBits; |
| hQC->elementBits[3]->maxBitsEl = maxChannelBits; |
| hQC->elementBits[4]->maxBitsEl = maxLfeBits; |
| break; |
| } |
| case MODE_7_1_TOP_FRONT: |
| case MODE_7_1_BACK: |
| case MODE_7_1_REAR_SURROUND: |
| case MODE_7_1_FRONT_CENTER: |
| case MODE_1_2_2_2_1: { |
| int cpe3Idx = (cm->encMode != MODE_7_1_TOP_FRONT) ? 3 : 4; |
| int lfeIdx = (cm->encMode != MODE_7_1_TOP_FRONT) ? 4 : 3; |
| |
| /* (7.1) sce + cpe + cpe + cpe + lfe */ |
| FIXP_DBL sceRate = hQC->elementBits[0]->relativeBitsEl = |
| cm->elInfo[0].relativeBits; |
| FIXP_DBL cpe1Rate = hQC->elementBits[1]->relativeBitsEl = |
| cm->elInfo[1].relativeBits; |
| FIXP_DBL cpe2Rate = hQC->elementBits[2]->relativeBitsEl = |
| cm->elInfo[2].relativeBits; |
| FIXP_DBL cpe3Rate = hQC->elementBits[cpe3Idx]->relativeBitsEl = |
| cm->elInfo[cpe3Idx].relativeBits; |
| FIXP_DBL lfeRate = hQC->elementBits[lfeIdx]->relativeBitsEl = |
| cm->elInfo[lfeIdx].relativeBits; |
| |
| int maxBitsTot = |
| maxChannelBits * 7; /* LFE does not add to bit reservoir */ |
| int sc = CountLeadingBits(fixMax(maxChannelBits, averageBitsTot)); |
| int maxLfeBits = (int)fMax( |
| (INT)((fMult(lfeRate, (FIXP_DBL)(maxChannelBits << sc)) >> sc) << 1), |
| (INT)((fMult(FL2FXCONST_DBL(1.1f / 2.f), |
| fMult(lfeRate, (FIXP_DBL)(averageBitsTot << sc))) |
| << 1) >> |
| sc)); |
| |
| maxChannelBits = (maxBitsTot - maxLfeBits) / 7; |
| |
| hQC->elementBits[0]->chBitrateEl = |
| fMult(sceRate, (FIXP_DBL)(bitrateTot << sc_brTot)) >> sc_brTot; |
| hQC->elementBits[1]->chBitrateEl = |
| fMult(cpe1Rate, (FIXP_DBL)(bitrateTot << sc_brTot)) >> (sc_brTot + 1); |
| hQC->elementBits[2]->chBitrateEl = |
| fMult(cpe2Rate, (FIXP_DBL)(bitrateTot << sc_brTot)) >> (sc_brTot + 1); |
| hQC->elementBits[cpe3Idx]->chBitrateEl = |
| fMult(cpe3Rate, (FIXP_DBL)(bitrateTot << sc_brTot)) >> (sc_brTot + 1); |
| hQC->elementBits[lfeIdx]->chBitrateEl = |
| fMult(lfeRate, (FIXP_DBL)(bitrateTot << sc_brTot)) >> sc_brTot; |
| |
| hQC->elementBits[0]->maxBitsEl = maxChannelBits; |
| hQC->elementBits[1]->maxBitsEl = 2 * maxChannelBits; |
| hQC->elementBits[2]->maxBitsEl = 2 * maxChannelBits; |
| hQC->elementBits[cpe3Idx]->maxBitsEl = 2 * maxChannelBits; |
| hQC->elementBits[lfeIdx]->maxBitsEl = maxLfeBits; |
| break; |
| } |
| |
| default: |
| return AAC_ENC_UNSUPPORTED_CHANNELCONFIG; |
| } |
| |
| return AAC_ENC_OK; |
| } |
| |
| /********************************************************************************/ |
| /* */ |
| /* function: GetMonoStereoMODE(const CHANNEL_MODE mode) */ |
| /* */ |
| /* description: Determines encoder setting from channel mode. */ |
| /* Multichannel modes are mapped to mono or stereo modes */ |
| /* returns MODE_MONO in case of mono, */ |
| /* MODE_STEREO in case of stereo */ |
| /* MODE_INVALID in case of error */ |
| /* */ |
| /* input: CHANNEL_MODE mode: Encoder mode (see qc_data.h). */ |
| /* output: return: CM_STEREO_MODE monoStereoSetting */ |
| /* (MODE_INVALID: error, */ |
| /* MODE_MONO: mono */ |
| /* MODE_STEREO: stereo). */ |
| /* */ |
| /* misc: No memory is allocated. */ |
| /* */ |
| /********************************************************************************/ |
| |
| ELEMENT_MODE FDKaacEnc_GetMonoStereoMode(const CHANNEL_MODE mode) { |
| ELEMENT_MODE monoStereoSetting = EL_MODE_INVALID; |
| |
| switch (mode) { |
| case MODE_1: /* mono setups */ |
| monoStereoSetting = EL_MODE_MONO; |
| break; |
| |
| case MODE_2: /* stereo setups */ |
| 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: |
| monoStereoSetting = EL_MODE_STEREO; |
| break; |
| |
| default: /* error */ |
| monoStereoSetting = EL_MODE_INVALID; |
| break; |
| } |
| |
| return monoStereoSetting; |
| } |
| |
| const CHANNEL_MODE_CONFIG_TAB* FDKaacEnc_GetChannelModeConfiguration( |
| const CHANNEL_MODE mode) { |
| INT i; |
| const CHANNEL_MODE_CONFIG_TAB* cm_config = NULL; |
| |
| /* get channel mode config */ |
| for (i = 0; i < (INT)sizeof(channelModeConfig) / |
| (INT)sizeof(CHANNEL_MODE_CONFIG_TAB); |
| i++) { |
| if (channelModeConfig[i].encMode == mode) { |
| cm_config = &channelModeConfig[i]; |
| break; |
| } |
| } |
| return cm_config; |
| } |
