| /* ----------------------------------------------------------------------------- |
| 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 |
| ----------------------------------------------------------------------------- */ |
| |
| /************************* System integration library ************************** |
| |
| Author(s): Thomas Dietzen |
| |
| Description: |
| |
| *******************************************************************************/ |
| |
| /** \file syslib_channelMapDescr.cpp |
| * \brief Implementation of routines that handle the channel map descriptor. |
| */ |
| |
| #include "syslib_channelMapDescr.h" |
| |
| #define DFLT_CH_MAP_TAB_LEN \ |
| (15) /* Length of the default channel map info table. */ |
| |
| /** |
| * \brief The following arrays provide a channel map for each channel config (0 |
| * to 14). |
| * |
| * The i-th channel will be mapped to the postion a[i-1]+1 |
| * with i>0 and a[] is one of the following mapping arrays. |
| */ |
| static const UCHAR mapFallback[] = {0, 1, 2, 3, 4, 5, 6, 7, |
| 8, 9, 10, 11, 12, 13, 14, 15, |
| 16, 17, 18, 19, 20, 21, 22, 23}; |
| static const UCHAR mapCfg1[] = {0, 1}; |
| static const UCHAR mapCfg2[] = {0, 1}; |
| static const UCHAR mapCfg3[] = {2, 0, 1}; |
| static const UCHAR mapCfg4[] = {2, 0, 1, 3}; |
| static const UCHAR mapCfg5[] = {2, 0, 1, 3, 4}; |
| static const UCHAR mapCfg6[] = {2, 0, 1, 4, 5, 3}; |
| static const UCHAR mapCfg7[] = {2, 6, 7, 0, 1, 4, 5, 3}; |
| static const UCHAR mapCfg11[] = {2, 0, 1, 4, 5, 6, 3}; |
| static const UCHAR mapCfg12[] = {2, 0, 1, 6, 7, 4, 5, 3}; |
| static const UCHAR mapCfg13[] = {2, 6, 7, 0, 1, 10, 11, 4, |
| 5, 8, 3, 9, 14, 12, 13, 18, |
| 19, 15, 16, 17, 20, 21, 22, 23}; |
| static const UCHAR mapCfg14[] = {2, 0, 1, 4, 5, 3, 6, 7}; |
| |
| /** |
| * \brief Default table comprising channel map information for each channel |
| * config (0 to 14). |
| */ |
| static const CHANNEL_MAP_INFO mapInfoTabDflt[DFLT_CH_MAP_TAB_LEN] = |
| {/* chCfg, map, numCh */ |
| /* 0 */ {mapFallback, 24}, |
| /* 1 */ {mapCfg1, 2}, |
| /* 2 */ {mapCfg2, 2}, |
| /* 3 */ {mapCfg3, 3}, |
| /* 4 */ {mapCfg4, 4}, |
| /* 5 */ {mapCfg5, 5}, |
| /* 6 */ {mapCfg6, 6}, |
| /* 7 */ {mapCfg7, 8}, |
| /* 8 */ {mapFallback, 24}, |
| /* 9 */ {mapFallback, 24}, |
| /* 10 */ {mapFallback, 24}, |
| /* 11 */ {mapCfg11, 7}, |
| /* 12 */ {mapCfg12, 8}, |
| /* 13 */ {mapCfg13, 24}, |
| /* 14 */ {mapCfg14, 8}}; |
| |
| /** |
| * Get the mapping value for a specific channel and map index. |
| */ |
| UCHAR FDK_chMapDescr_getMapValue(const FDK_channelMapDescr* const pMapDescr, |
| const UCHAR chIdx, const UINT mapIdx) { |
| UCHAR mapValue = chIdx; /* Pass through by default. */ |
| |
| FDK_ASSERT(pMapDescr != NULL); |
| |
| if ((pMapDescr->fPassThrough == 0) && (pMapDescr->pMapInfoTab != NULL) && |
| (pMapDescr->mapInfoTabLen > mapIdx)) { /* Nest sanity check to avoid |
| possible memory access |
| violation. */ |
| if (chIdx < pMapDescr->pMapInfoTab[mapIdx].numChannels) { |
| mapValue = pMapDescr->pMapInfoTab[mapIdx].pChannelMap[chIdx]; |
| } |
| } |
| return mapValue; |
| } |
| |
| /** |
| * \brief Evaluate whether single channel map is reasonable or not. |
| * |
| * \param pMapInfo Pointer to channel map. |
| * \return Value unequal to zero if map is valid, otherwise zero. |
| */ |
| static int fdk_chMapDescr_isValidMap(const CHANNEL_MAP_INFO* const pMapInfo) { |
| int result = 1; |
| UINT i; |
| |
| if (pMapInfo == NULL) { |
| result = 0; |
| } else { |
| UINT numChannels = pMapInfo->numChannels; |
| |
| /* Check for all map values if they are inside the range 0 to numChannels-1 |
| * and unique. */ |
| if (numChannels < 32) { /* Optimized version for less than 32 channels. |
| Needs only one loop. */ |
| UINT mappedChMask = 0x0; |
| for (i = 0; i < numChannels; i += 1) { |
| mappedChMask |= 1 << pMapInfo->pChannelMap[i]; |
| } |
| if (mappedChMask != (((UINT)1 << numChannels) - 1)) { |
| result = 0; |
| } |
| } else { /* General case that can handle all number of channels but needs |
| one more loop. */ |
| for (i = 0; (i < numChannels) && result; i += 1) { |
| UINT j; |
| UCHAR value0 = pMapInfo->pChannelMap[i]; |
| |
| if (value0 > numChannels - 1) { /* out of range? */ |
| result = 0; |
| } |
| for (j = numChannels - 1; (j > i) && result; j -= 1) { |
| if (value0 == pMapInfo->pChannelMap[j]) { /* not unique */ |
| result = 0; |
| } |
| } |
| } |
| } |
| } |
| |
| return result; |
| } |
| |
| /** |
| * Evaluate whether channel map descriptor is reasonable or not. |
| */ |
| int FDK_chMapDescr_isValid(const FDK_channelMapDescr* const pMapDescr) { |
| int result = 0; |
| UINT i; |
| |
| if (pMapDescr != NULL) { |
| result = 1; |
| for (i = 0; (i < pMapDescr->mapInfoTabLen) && result; i += 1) { |
| if (!fdk_chMapDescr_isValidMap(&pMapDescr->pMapInfoTab[i])) { |
| result = 0; |
| } |
| } |
| } |
| return result; |
| } |
| |
| /** |
| * Initialize the complete channel map descriptor. |
| */ |
| void FDK_chMapDescr_init(FDK_channelMapDescr* const pMapDescr, |
| const CHANNEL_MAP_INFO* const pMapInfoTab, |
| const UINT mapInfoTabLen, const UINT fPassThrough) { |
| if (pMapDescr != NULL) { |
| int useDefaultTab = 1; |
| |
| pMapDescr->fPassThrough = (fPassThrough == 0) ? 0 : 1; |
| |
| if ((pMapInfoTab != NULL) && (mapInfoTabLen > 0)) { |
| /* Set the valid custom mapping table. */ |
| pMapDescr->pMapInfoTab = pMapInfoTab; |
| pMapDescr->mapInfoTabLen = mapInfoTabLen; |
| /* Validate the complete descriptor. */ |
| useDefaultTab = (FDK_chMapDescr_isValid(pMapDescr) == 0) ? 1 : 0; |
| } |
| if (useDefaultTab != 0) { |
| /* Set default table. */ |
| pMapDescr->pMapInfoTab = mapInfoTabDflt; |
| pMapDescr->mapInfoTabLen = DFLT_CH_MAP_TAB_LEN; |
| } |
| } |
| } |
| |
| /** |
| * Set channel mapping bypass flag in a given channel map descriptor. |
| */ |
| int FDK_chMapDescr_setPassThrough(FDK_channelMapDescr* const pMapDescr, |
| UINT fPassThrough) { |
| int err = 1; |
| |
| if (pMapDescr != NULL) { |
| if ((pMapDescr->pMapInfoTab != NULL) && (pMapDescr->mapInfoTabLen > 0)) { |
| pMapDescr->fPassThrough = (fPassThrough == 0) ? 0 : 1; |
| err = 0; |
| } |
| } |
| |
| return err; |
| } |
