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+/* -----------------------------------------------------------------------------
+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;
+}
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