mirror of https://github.com/mstorsjo/fdk-aac.git
170 lines
6.9 KiB
C
170 lines
6.9 KiB
C
/* -----------------------------------------------------------------------------
|
|
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.Werner
|
|
|
|
Description: Psychoaccoustic data
|
|
|
|
*******************************************************************************/
|
|
|
|
#ifndef PSY_DATA_H
|
|
#define PSY_DATA_H
|
|
|
|
#include "block_switch.h"
|
|
#include "mdct.h"
|
|
|
|
/* Be careful with MAX_SFB_LONG as length of the .Long arrays.
|
|
* sfbEnergy.Long and sfbEnergyMS.Long and sfbThreshold.Long are used as a
|
|
* temporary storage for the regrouped short energies and thresholds between
|
|
* FDKaacEnc_groupShortData() and BuildInterface() in FDKaacEnc_psyMain(). The
|
|
* space required for this is MAX_GROUPED_SFB ( = MAX_NO_OF_GROUPS*MAX_SFB_SHORT
|
|
* ). However, this is not important if unions are used (which is not possible
|
|
* with pfloat). */
|
|
|
|
typedef shouldBeUnion {
|
|
FIXP_DBL Long[MAX_GROUPED_SFB];
|
|
FIXP_DBL Short[TRANS_FAC][MAX_SFB_SHORT];
|
|
}
|
|
SFB_THRESHOLD;
|
|
|
|
typedef shouldBeUnion {
|
|
FIXP_DBL Long[MAX_GROUPED_SFB];
|
|
FIXP_DBL Short[TRANS_FAC][MAX_SFB_SHORT];
|
|
}
|
|
SFB_ENERGY;
|
|
|
|
typedef shouldBeUnion {
|
|
FIXP_DBL Long[MAX_GROUPED_SFB];
|
|
FIXP_DBL Short[TRANS_FAC][MAX_SFB_SHORT];
|
|
}
|
|
SFB_LD_ENERGY;
|
|
|
|
typedef shouldBeUnion {
|
|
INT Long[MAX_GROUPED_SFB];
|
|
INT Short[TRANS_FAC][MAX_SFB_SHORT];
|
|
}
|
|
SFB_MAX_SCALE;
|
|
|
|
typedef struct {
|
|
INT_PCM* psyInputBuffer;
|
|
FIXP_DBL overlapAddBuffer[3 * 512 / 2];
|
|
|
|
mdct_t mdctPers; /* MDCT persistent data */
|
|
BLOCK_SWITCHING_CONTROL blockSwitchingControl; /* block switching */
|
|
FIXP_DBL sfbThresholdnm1[MAX_SFB]; /* FDKaacEnc_PreEchoControl */
|
|
INT mdctScalenm1; /* scale of last block's mdct (FDKaacEnc_PreEchoControl) */
|
|
INT calcPreEcho;
|
|
INT isLFE;
|
|
} PSY_STATIC;
|
|
|
|
typedef struct {
|
|
FIXP_DBL* mdctSpectrum;
|
|
SFB_THRESHOLD sfbThreshold; /* adapt */
|
|
SFB_ENERGY sfbEnergy; /* sfb energies */
|
|
SFB_LD_ENERGY sfbEnergyLdData; /* sfb energies in ldData format */
|
|
SFB_MAX_SCALE sfbMaxScaleSpec;
|
|
SFB_ENERGY sfbEnergyMS; /* mid/side sfb energies */
|
|
FIXP_DBL sfbEnergyMSLdData[MAX_GROUPED_SFB]; /* mid/side sfb energies in
|
|
ldData format */
|
|
SFB_ENERGY sfbSpreadEnergy;
|
|
INT mdctScale; /* exponent of data in mdctSpectrum */
|
|
INT groupedSfbOffset[MAX_GROUPED_SFB + 1];
|
|
INT sfbActive;
|
|
INT lowpassLine;
|
|
} PSY_DATA;
|
|
|
|
#endif /* PSY_DATA_H */
|