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