mirror of https://github.com/mstorsjo/fdk-aac.git
361 lines
13 KiB
C++
361 lines
13 KiB
C++
/* -----------------------------------------------------------------------------
|
|
Software License for The Fraunhofer FDK AAC Codec Library for Android
|
|
|
|
© Copyright 1995 - 2019 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, 13000, 13000},
|
|
{AACENC_BR_MODE_VBR_2, 13000, 13000},
|
|
{AACENC_BR_MODE_VBR_3, 15750, 15750},
|
|
{AACENC_BR_MODE_VBR_4, 16500, 16500},
|
|
{AACENC_BR_MODE_VBR_5, 19293, 19293},
|
|
{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;
|
|
}
|