/* ----------------------------------------------------------------------------- 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}}; static const UCHAR mapWg4Cfg1[] = {0, 1}; static const UCHAR mapWg4Cfg2[] = {0, 1}; static const UCHAR mapWg4Cfg3[] = {2, 0, 1}; static const UCHAR mapWg4Cfg4[] = {3, 0, 1, 2}; static const UCHAR mapWg4Cfg5[] = {4, 0, 1, 2, 3}; static const UCHAR mapWg4Cfg6[] = {4, 0, 1, 2, 3, 5}; static const UCHAR mapWg4Cfg7[] = {6, 0, 1, 2, 3, 4, 5, 7}; static const UCHAR mapWg4Cfg14[] = {6, 0, 1, 2, 3, 4, 5, 7}; const CHANNEL_MAP_INFO FDK_mapInfoTabWg4[] = {/* chCfg, map, numCh */ /* 0 */ {mapFallback, 24}, /* 1 */ {mapWg4Cfg1, 2}, /* 2 */ {mapWg4Cfg2, 2}, /* 3 */ {mapWg4Cfg3, 3}, /* 4 */ {mapWg4Cfg4, 4}, /* 5 */ {mapWg4Cfg5, 5}, /* 6 */ {mapWg4Cfg6, 6}, /* 7 */ {mapWg4Cfg7, 8}, /* 8 */ {mapFallback, 24}, /* 9 */ {mapFallback, 24}, /* 10 */ {mapFallback, 24}, /* 11 */ {mapFallback, 24}, // Unhandled for Wg4 yet /* 12 */ {mapFallback, 24}, // Unhandled for Wg4 yet /* 13 */ {mapFallback, 24}, // Unhandled for Wg4 yet /* 14 */ {mapFallback, 24}}; // Unhandled for Wg4 yet const UINT FDK_mapInfoTabLenWg4 = sizeof(FDK_mapInfoTabWg4)/sizeof(FDK_mapInfoTabWg4[0]); /** * 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; }