mirror of https://github.com/mstorsjo/fdk-aac.git
334 lines
12 KiB
C++
334 lines
12 KiB
C++
/* -----------------------------------------------------------------------------
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Software License for The Fraunhofer FDK AAC Codec Library for Android
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© Copyright 1995 - 2019 Fraunhofer-Gesellschaft zur Förderung der angewandten
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Forschung e.V. All rights reserved.
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1. INTRODUCTION
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The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
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that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
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scheme for digital audio. This FDK AAC Codec software is intended to be used on
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a wide variety of Android devices.
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AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
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general perceptual audio codecs. AAC-ELD is considered the best-performing
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full-bandwidth communications codec by independent studies and is widely
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deployed. AAC has been standardized by ISO and IEC as part of the MPEG
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specifications.
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Patent licenses for necessary patent claims for the FDK AAC Codec (including
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those of Fraunhofer) may be obtained through Via Licensing
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(www.vialicensing.com) or through the respective patent owners individually for
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the purpose of encoding or decoding bit streams in products that are compliant
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with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
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Android devices already license these patent claims through Via Licensing or
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directly from the patent owners, and therefore FDK AAC Codec software may
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already be covered under those patent licenses when it is used for those
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licensed purposes only.
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Commercially-licensed AAC software libraries, including floating-point versions
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with enhanced sound quality, are also available from Fraunhofer. Users are
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encouraged to check the Fraunhofer website for additional applications
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information and documentation.
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2. COPYRIGHT LICENSE
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Redistribution and use in source and binary forms, with or without modification,
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are permitted without payment of copyright license fees provided that you
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satisfy the following conditions:
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You must retain the complete text of this software license in redistributions of
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the FDK AAC Codec or your modifications thereto in source code form.
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You must retain the complete text of this software license in the documentation
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and/or other materials provided with redistributions of the FDK AAC Codec or
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your modifications thereto in binary form. You must make available free of
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charge copies of the complete source code of the FDK AAC Codec and your
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modifications thereto to recipients of copies in binary form.
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The name of Fraunhofer may not be used to endorse or promote products derived
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from this library without prior written permission.
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You may not charge copyright license fees for anyone to use, copy or distribute
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the FDK AAC Codec software or your modifications thereto.
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Your modified versions of the FDK AAC Codec must carry prominent notices stating
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that you changed the software and the date of any change. For modified versions
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of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
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must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
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AAC Codec Library for Android."
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3. NO PATENT LICENSE
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NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
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limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
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Fraunhofer provides no warranty of patent non-infringement with respect to this
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software.
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You may use this FDK AAC Codec software or modifications thereto only for
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purposes that are authorized by appropriate patent licenses.
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4. DISCLAIMER
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This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
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holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
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including but not limited to the implied warranties of merchantability and
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fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
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or consequential damages, including but not limited to procurement of substitute
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goods or services; loss of use, data, or profits, or business interruption,
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however caused and on any theory of liability, whether in contract, strict
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liability, or tort (including negligence), arising in any way out of the use of
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this software, even if advised of the possibility of such damage.
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5. CONTACT INFORMATION
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Fraunhofer Institute for Integrated Circuits IIS
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Attention: Audio and Multimedia Departments - FDK AAC LL
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Am Wolfsmantel 33
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91058 Erlangen, Germany
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www.iis.fraunhofer.de/amm
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amm-info@iis.fraunhofer.de
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----------------------------------------------------------------------------- */
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/************************* MPEG-D DRC decoder library **************************
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Author(s):
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Description:
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*******************************************************************************/
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#include "drcDec_types.h"
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#include "drcDec_tools.h"
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#include "drcDec_gainDecoder.h"
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#include "drcGainDec_init.h"
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static DRC_ERROR _generateDrcInstructionsDerivedData(
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HANDLE_DRC_GAIN_DECODER hGainDec, HANDLE_UNI_DRC_CONFIG hUniDrcConfig,
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DRC_INSTRUCTIONS_UNI_DRC* pInst, DRC_COEFFICIENTS_UNI_DRC* pCoef,
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ACTIVE_DRC* pActiveDrc) {
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DRC_ERROR err = DE_OK;
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int g;
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int gainElementCount = 0;
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UCHAR nDrcChannelGroups = 0;
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SCHAR gainSetIndexForChannelGroup[8];
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err = deriveDrcChannelGroups(
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pInst->drcSetEffect, pInst->drcChannelCount, pInst->gainSetIndex,
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pInst->drcSetEffect & (EB_DUCK_OTHER | EB_DUCK_SELF)
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? pInst->duckingModificationForChannel
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: NULL,
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&nDrcChannelGroups, gainSetIndexForChannelGroup,
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pActiveDrc->channelGroupForChannel,
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pInst->drcSetEffect & (EB_DUCK_OTHER | EB_DUCK_SELF)
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? pActiveDrc->duckingModificationForChannelGroup
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: NULL);
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if (err) return (err);
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/* sanity check */
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if (nDrcChannelGroups != pInst->nDrcChannelGroups) return DE_NOT_OK;
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for (g = 0; g < pInst->nDrcChannelGroups; g++) {
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if (gainSetIndexForChannelGroup[g] != pInst->gainSetIndexForChannelGroup[g])
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return DE_NOT_OK;
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}
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for (g = 0; g < pInst->nDrcChannelGroups; g++) {
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int seq = pInst->gainSetIndexForChannelGroup[g];
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if (seq != -1 && (hUniDrcConfig->drcCoefficientsUniDrcCount == 0 ||
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seq >= pCoef->gainSetCount)) {
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pActiveDrc->channelGroupIsParametricDrc[g] = 1;
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} else {
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pActiveDrc->channelGroupIsParametricDrc[g] = 0;
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if (seq >= pCoef->gainSetCount) {
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return DE_NOT_OK;
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}
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}
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}
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/* gainElementCount */
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if (pInst->drcSetEffect & (EB_DUCK_OTHER | EB_DUCK_SELF)) {
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for (g = 0; g < pInst->nDrcChannelGroups; g++) {
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pActiveDrc->bandCountForChannelGroup[g] = 1;
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}
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pActiveDrc->gainElementCount =
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pInst->nDrcChannelGroups; /* one gain element per channel group */
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} else {
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for (g = 0; g < pInst->nDrcChannelGroups; g++) {
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if (pActiveDrc->channelGroupIsParametricDrc[g]) {
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gainElementCount++;
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pActiveDrc->bandCountForChannelGroup[g] = 1;
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} else {
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int seq, bandCount;
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seq = pInst->gainSetIndexForChannelGroup[g];
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bandCount = pCoef->gainSet[seq].bandCount;
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pActiveDrc->bandCountForChannelGroup[g] = bandCount;
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gainElementCount += bandCount;
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}
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}
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pActiveDrc->gainElementCount = gainElementCount;
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}
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/* prepare gainElementForGroup (cumulated sum of bandCountForChannelGroup) */
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pActiveDrc->gainElementForGroup[0] = 0;
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for (g = 1; g < pInst->nDrcChannelGroups; g++) {
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pActiveDrc->gainElementForGroup[g] =
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pActiveDrc->gainElementForGroup[g - 1] +
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pActiveDrc->bandCountForChannelGroup[g - 1]; /* index of first gain
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sequence in channel
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group */
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}
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return DE_OK;
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}
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DRC_ERROR
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initGainDec(HANDLE_DRC_GAIN_DECODER hGainDec) {
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int i, j, k;
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/* sanity check */
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if (hGainDec->deltaTminDefault > hGainDec->frameSize) return DE_NOT_OK;
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for (i = 0; i < MAX_ACTIVE_DRCS; i++) {
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for (j = 0; j < 8; j++) {
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/* use startup node at the beginning */
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hGainDec->activeDrc[i].lnbIndexForChannel[j][0] = 0;
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for (k = 1; k < NUM_LNB_FRAMES; k++) {
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hGainDec->activeDrc[i].lnbIndexForChannel[j][k] = -1;
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}
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}
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}
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for (j = 0; j < 8; j++) {
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hGainDec->channelGain[j] = FL2FXCONST_DBL(1.0f / (float)(1 << 8));
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}
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for (i = 0; i < 4 * 1024 / 256; i++) {
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hGainDec->dummySubbandGains[i] = FL2FXCONST_DBL(1.0f / (float)(1 << 7));
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}
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hGainDec->status = 0; /* startup */
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return DE_OK;
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}
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void initDrcGainBuffers(const int frameSize, DRC_GAIN_BUFFERS* drcGainBuffers) {
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int i, c, j;
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/* prepare 12 instances of node buffers */
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for (i = 0; i < 12; i++) {
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for (j = 0; j < NUM_LNB_FRAMES; j++) {
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drcGainBuffers->linearNodeBuffer[i].nNodes[j] = 1;
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drcGainBuffers->linearNodeBuffer[i].linearNode[j][0].gainLin =
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FL2FXCONST_DBL(1.0f / (float)(1 << 7));
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if (j == 0) {
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drcGainBuffers->linearNodeBuffer[i].linearNode[j][0].time =
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0; /* initialize last node with startup node */
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} else {
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drcGainBuffers->linearNodeBuffer[i].linearNode[j][0].time =
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frameSize - 1;
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}
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}
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}
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/* prepare dummyLnb, a linearNodeBuffer containing a constant gain of 0 dB,
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* for the "no DRC processing" case */
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drcGainBuffers->dummyLnb.gainInterpolationType = GIT_LINEAR;
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for (i = 0; i < NUM_LNB_FRAMES; i++) {
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drcGainBuffers->dummyLnb.nNodes[i] = 1;
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drcGainBuffers->dummyLnb.linearNode[i][0].gainLin =
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FL2FXCONST_DBL(1.0f / (float)(1 << 7));
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drcGainBuffers->dummyLnb.linearNode[i][0].time = frameSize - 1;
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}
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/* prepare channelGain delay line */
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for (c = 0; c < 8; c++) {
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for (i = 0; i < NUM_LNB_FRAMES; i++) {
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drcGainBuffers->channelGain[c][i] =
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FL2FXCONST_DBL(1.0f / (float)(1 << 8));
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}
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}
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drcGainBuffers->lnbPointer = 0;
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}
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DRC_ERROR
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initActiveDrc(HANDLE_DRC_GAIN_DECODER hGainDec,
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HANDLE_UNI_DRC_CONFIG hUniDrcConfig, const int drcSetIdSelected,
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const int downmixIdSelected) {
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int g, isMultiband = 0;
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DRC_ERROR err = DE_OK;
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DRC_INSTRUCTIONS_UNI_DRC* pInst = NULL;
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DRC_COEFFICIENTS_UNI_DRC* pCoef = NULL;
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pInst = selectDrcInstructions(hUniDrcConfig, drcSetIdSelected);
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if (pInst == NULL) {
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return DE_NOT_OK;
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}
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if (pInst->drcSetId >= 0) {
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pCoef = selectDrcCoefficients(hUniDrcConfig, pInst->drcLocation);
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if (pCoef == NULL) {
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return DE_NOT_OK;
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}
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if (pCoef->drcFrameSizePresent) {
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if (pCoef->drcFrameSize != hGainDec->frameSize) {
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return DE_NOT_OK;
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}
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}
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err = _generateDrcInstructionsDerivedData(
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hGainDec, hUniDrcConfig, pInst, pCoef,
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&(hGainDec->activeDrc[hGainDec->nActiveDrcs]));
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if (err) return err;
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}
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hGainDec->activeDrc[hGainDec->nActiveDrcs].pInst = pInst;
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hGainDec->activeDrc[hGainDec->nActiveDrcs].pCoef = pCoef;
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for (g = 0; g < pInst->nDrcChannelGroups; g++) {
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if (hGainDec->activeDrc[hGainDec->nActiveDrcs].bandCountForChannelGroup[g] >
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1) {
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if (hGainDec->multiBandActiveDrcIndex != -1) {
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return DE_NOT_OK;
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}
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isMultiband = 1;
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}
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}
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if (isMultiband) {
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/* Keep activeDrc index of multiband DRC set */
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hGainDec->multiBandActiveDrcIndex = hGainDec->nActiveDrcs;
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}
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if ((hGainDec->channelGainActiveDrcIndex == -1) &&
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(downmixIdSelected == DOWNMIX_ID_BASE_LAYOUT) &&
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(hUniDrcConfig->drcInstructionsUniDrcCount >
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0)) { /* use this activeDrc to apply channelGains */
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hGainDec->channelGainActiveDrcIndex = hGainDec->nActiveDrcs;
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}
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hGainDec->nActiveDrcs++;
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if (hGainDec->nActiveDrcs > MAX_ACTIVE_DRCS) return DE_NOT_OK;
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return DE_OK;
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}
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DRC_ERROR
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initActiveDrcOffset(HANDLE_DRC_GAIN_DECODER hGainDec) {
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int a, accGainElementCount;
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accGainElementCount = 0;
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for (a = 0; a < hGainDec->nActiveDrcs; a++) {
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hGainDec->activeDrc[a].activeDrcOffset = accGainElementCount;
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accGainElementCount += hGainDec->activeDrc[a].gainElementCount;
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if (accGainElementCount > 12) {
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hGainDec->nActiveDrcs = a;
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return DE_NOT_OK;
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}
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}
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return DE_OK;
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}
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