mirror of https://github.com/mstorsjo/fdk-aac.git
277 lines
9.2 KiB
C
277 lines
9.2 KiB
C
/* -----------------------------------------------------------------------------
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Software License for The Fraunhofer FDK AAC Codec Library for Android
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© Copyright 1995 - 2018 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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/**************************** SBR encoder library ******************************
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Author(s):
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Description:
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*******************************************************************************/
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/*!
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\file
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\brief SBR main definitions $Revision: 92790 $
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*/
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#ifndef SBR_DEF_H
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#define SBR_DEF_H
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#include "common_fix.h"
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#define noError 0
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#define HANDLE_ERROR_INFO INT
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#define ERROR(a, b) 1
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/* #define SBR_ENV_STATISTICS_BITRATE */
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#undef SBR_ENV_STATISTICS_BITRATE
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/* #define SBR_ENV_STATISTICS */
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#undef SBR_ENV_STATISTICS
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/* #define SBR_PAYLOAD_MONITOR */
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#undef SBR_PAYLOAD_MONITOR
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#define SWAP(a, b) tempr = a, a = b, b = tempr
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#define TRUE 1
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#define FALSE 0
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/* Constants */
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#define EPS 1e-12
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#define LOG2 0.69314718056f /* natural logarithm of 2 */
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#define ILOG2 1.442695041f /* 1/LOG2 */
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#define RELAXATION_FLOAT (1e-6f)
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#define RELAXATION (FL2FXCONST_DBL(RELAXATION_FLOAT))
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#define RELAXATION_FRACT \
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(FL2FXCONST_DBL(0.524288f)) /* 0.524288f is fractional part of RELAXATION */
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#define RELAXATION_SHIFT (19)
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#define RELAXATION_LD64 \
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(FL2FXCONST_DBL(0.31143075889f)) /* (ld64(RELAXATION) \
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*/
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/************ Definitions ***************/
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#define SBR_COMP_MODE_DELTA 0
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#define SBR_COMP_MODE_CTS 1
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#define SBR_MAX_ENERGY_VALUES 5
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#define SBR_GLOBAL_TONALITY_VALUES 2
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#define MAX_NUM_CHANNELS 2
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#define MAX_NOISE_ENVELOPES 2
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#define MAX_NUM_NOISE_COEFFS 5
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#define MAX_NUM_NOISE_VALUES (MAX_NUM_NOISE_COEFFS * MAX_NOISE_ENVELOPES)
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#define MAX_NUM_ENVELOPE_VALUES (MAX_ENVELOPES * MAX_FREQ_COEFFS)
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#define MAX_ENVELOPES 5
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#define MAX_FREQ_COEFFS 48
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#define MAX_FREQ_COEFFS_FS44100 35
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#define MAX_FREQ_COEFFS_FS48000 32
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#define NO_OF_ESTIMATES_LC 4
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#define NO_OF_ESTIMATES_LD 3
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#define MAX_NO_OF_ESTIMATES 4
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#define NOISE_FLOOR_OFFSET 6
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#define NOISE_FLOOR_OFFSET_64 (FL2FXCONST_DBL(0.09375f))
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#define LOW_RES 0
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#define HIGH_RES 1
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#define LO 0
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#define HI 1
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#define LENGTH_SBR_FRAME_INFO 35 /* 19 */
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#define SBR_NSFB_LOW_RES 9 /* 8 */
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#define SBR_NSFB_HIGH_RES 18 /* 16 */
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#define SBR_XPOS_CTRL_DEFAULT 2
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#define SBR_FREQ_SCALE_DEFAULT 2
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#define SBR_ALTER_SCALE_DEFAULT 1
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#define SBR_NOISE_BANDS_DEFAULT 2
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#define SBR_LIMITER_BANDS_DEFAULT 2
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#define SBR_LIMITER_GAINS_DEFAULT 2
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#define SBR_LIMITER_GAINS_INFINITE 3
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#define SBR_INTERPOL_FREQ_DEFAULT 1
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#define SBR_SMOOTHING_LENGTH_DEFAULT 0
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/* sbr_header */
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#define SI_SBR_AMP_RES_BITS 1
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#define SI_SBR_COUPLING_BITS 1
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#define SI_SBR_START_FREQ_BITS 4
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#define SI_SBR_STOP_FREQ_BITS 4
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#define SI_SBR_XOVER_BAND_BITS 3
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#define SI_SBR_RESERVED_BITS 2
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#define SI_SBR_DATA_EXTRA_BITS 1
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#define SI_SBR_HEADER_EXTRA_1_BITS 1
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#define SI_SBR_HEADER_EXTRA_2_BITS 1
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/* sbr_header extra 1 */
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#define SI_SBR_FREQ_SCALE_BITS 2
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#define SI_SBR_ALTER_SCALE_BITS 1
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#define SI_SBR_NOISE_BANDS_BITS 2
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/* sbr_header extra 2 */
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#define SI_SBR_LIMITER_BANDS_BITS 2
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#define SI_SBR_LIMITER_GAINS_BITS 2
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#define SI_SBR_INTERPOL_FREQ_BITS 1
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#define SI_SBR_SMOOTHING_LENGTH_BITS 1
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/* sbr_grid */
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#define SBR_CLA_BITS 2 /*!< size of bs_frame_class */
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#define SBR_CLA_BITS_LD 1 /*!< size of bs_frame_class */
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#define SBR_ENV_BITS 2 /*!< size of bs_num_env_raw */
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#define SBR_ABS_BITS 2 /*!< size of bs_abs_bord_raw for HE-AAC */
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#define SBR_NUM_BITS 2 /*!< size of bs_num_rel */
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#define SBR_REL_BITS 2 /*!< size of bs_rel_bord_raw */
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#define SBR_RES_BITS 1 /*!< size of bs_freq_res_flag */
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#define SBR_DIR_BITS 1 /*!< size of bs_df_flag */
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/* sbr_data */
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#define SI_SBR_INVF_MODE_BITS 2
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#define SI_SBR_START_ENV_BITS_AMP_RES_3_0 6
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#define SI_SBR_START_ENV_BITS_BALANCE_AMP_RES_3_0 5
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#define SI_SBR_START_NOISE_BITS_AMP_RES_3_0 5
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#define SI_SBR_START_NOISE_BITS_BALANCE_AMP_RES_3_0 5
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#define SI_SBR_START_ENV_BITS_AMP_RES_1_5 7
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#define SI_SBR_START_ENV_BITS_BALANCE_AMP_RES_1_5 6
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#define SI_SBR_EXTENDED_DATA_BITS 1
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#define SI_SBR_EXTENSION_SIZE_BITS 4
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#define SI_SBR_EXTENSION_ESC_COUNT_BITS 8
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#define SI_SBR_EXTENSION_ID_BITS 2
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#define SBR_EXTENDED_DATA_MAX_CNT (15 + 255)
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#define EXTENSION_ID_PS_CODING 2
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/* Envelope coding constants */
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#define FREQ 0
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#define TIME 1
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/* qmf data scaling */
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#define QMF_SCALE_OFFSET 7
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/* huffman tables */
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#define CODE_BOOK_SCF_LAV00 60
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#define CODE_BOOK_SCF_LAV01 31
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#define CODE_BOOK_SCF_LAV10 60
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#define CODE_BOOK_SCF_LAV11 31
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#define CODE_BOOK_SCF_LAV_BALANCE11 12
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#define CODE_BOOK_SCF_LAV_BALANCE10 24
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typedef enum { SBR_AMP_RES_1_5 = 0, SBR_AMP_RES_3_0 } AMP_RES;
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typedef enum {
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XPOS_MDCT,
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XPOS_MDCT_CROSS,
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XPOS_LC,
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XPOS_RESERVED,
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XPOS_SWITCHED /* not a real choice but used here to control behaviour */
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} XPOS_MODE;
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typedef enum {
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INVF_OFF = 0,
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INVF_LOW_LEVEL,
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INVF_MID_LEVEL,
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INVF_HIGH_LEVEL,
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INVF_SWITCHED /* not a real choice but used here to control behaviour */
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} INVF_MODE;
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#endif
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