ref: 4d4850f5de853099d2e2883057458ad48ccec477
dir: /libfaad/mp4.c/
/*
** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
** Copyright (C) 2003-2004 M. Bakker, Ahead Software AG, http://www.nero.com
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
**
** Any non-GPL usage of this software or parts of this software is strictly
** forbidden.
**
** Commercial non-GPL licensing of this software is possible.
** For more info contact Ahead Software through Mpeg4AAClicense@nero.com.
**
** $Id: mp4.c,v 1.32 2004/09/04 14:56:28 menno Exp $
**/
#include "common.h"
#include "structs.h"
#include <stdlib.h>
#include "bits.h"
#include "mp4.h"
#include "syntax.h"
/* defines if an object type can be decoded by this library or not */
static uint8_t ObjectTypesTable[32] = {
0, /* 0 NULL */
#ifdef MAIN_DEC
1, /* 1 AAC Main */
#else
0, /* 1 AAC Main */
#endif
1, /* 2 AAC LC */
#ifdef SSR_DEC
1, /* 3 AAC SSR */
#else
0, /* 3 AAC SSR */
#endif
#ifdef LTP_DEC
1, /* 4 AAC LTP */
#else
0, /* 4 AAC LTP */
#endif
#ifdef SBR_DEC
1, /* 5 SBR */
#else
0, /* 5 SBR */
#endif
#ifdef SCALABLE_DEC
1, /* 6 AAC Scalable */
#else
0, /* 6 AAC Scalable */
#endif
0, /* 7 TwinVQ */
0, /* 8 CELP */
0, /* 9 HVXC */
0, /* 10 Reserved */
0, /* 11 Reserved */
0, /* 12 TTSI */
0, /* 13 Main synthetic */
0, /* 14 Wavetable synthesis */
0, /* 15 General MIDI */
0, /* 16 Algorithmic Synthesis and Audio FX */
/* MPEG-4 Version 2 */
#ifdef ERROR_RESILIENCE
1, /* 17 ER AAC LC */
0, /* 18 (Reserved) */
#ifdef LTP_DEC
1, /* 19 ER AAC LTP */
#else
0, /* 19 ER AAC LTP */
#endif
#ifdef SCALABLE_DEC
1, /* 20 ER AAC scalable */
#else
0, /* 20 ER AAC scalable */
#endif
0, /* 21 ER TwinVQ */
0, /* 22 ER BSAC */
#ifdef LD_DEC
1, /* 23 ER AAC LD */
#else
0, /* 23 ER AAC LD */
#endif
0, /* 24 ER CELP */
0, /* 25 ER HVXC */
0, /* 26 ER HILN */
0, /* 27 ER Parametric */
#else /* No ER defined */
0, /* 17 ER AAC LC */
0, /* 18 (Reserved) */
0, /* 19 ER AAC LTP */
0, /* 20 ER AAC scalable */
0, /* 21 ER TwinVQ */
0, /* 22 ER BSAC */
0, /* 23 ER AAC LD */
0, /* 24 ER CELP */
0, /* 25 ER HVXC */
0, /* 26 ER HILN */
0, /* 27 ER Parametric */
#endif
0, /* 28 (Reserved) */
0, /* 29 (Reserved) */
0, /* 30 (Reserved) */
0 /* 31 (Reserved) */
};
/* Table 1.6.1 */
int8_t NEAACDECAPI NeAACDecAudioSpecificConfig(uint8_t *pBuffer,
uint32_t buffer_size,
mp4AudioSpecificConfig *mp4ASC)
{
return AudioSpecificConfig2(pBuffer, buffer_size, mp4ASC, NULL);
}
int8_t AudioSpecificConfig2(uint8_t *pBuffer,
uint32_t buffer_size,
mp4AudioSpecificConfig *mp4ASC,
program_config *pce)
{
bitfile ld;
int8_t result = 0;
#ifdef SBR_DEC
int8_t bits_to_decode = 0;
#endif
if (pBuffer == NULL)
return -7;
if (mp4ASC == NULL)
return -8;
memset(mp4ASC, 0, sizeof(mp4AudioSpecificConfig));
faad_initbits(&ld, pBuffer, buffer_size);
faad_byte_align(&ld);
mp4ASC->objectTypeIndex = (uint8_t)faad_getbits(&ld, 5
DEBUGVAR(1,1,"parse_audio_decoder_specific_info(): ObjectTypeIndex"));
mp4ASC->samplingFrequencyIndex = (uint8_t)faad_getbits(&ld, 4
DEBUGVAR(1,2,"parse_audio_decoder_specific_info(): SamplingFrequencyIndex"));
mp4ASC->channelsConfiguration = (uint8_t)faad_getbits(&ld, 4
DEBUGVAR(1,3,"parse_audio_decoder_specific_info(): ChannelsConfiguration"));
mp4ASC->samplingFrequency = get_sample_rate(mp4ASC->samplingFrequencyIndex);
if (ObjectTypesTable[mp4ASC->objectTypeIndex] != 1)
{
faad_endbits(&ld);
return -1;
}
if (mp4ASC->samplingFrequency == 0)
{
faad_endbits(&ld);
return -2;
}
if (mp4ASC->channelsConfiguration > 7)
{
faad_endbits(&ld);
return -3;
}
#if (defined(PS_DEC) || defined(DRM_PS))
/* check if we have a mono file */
if (mp4ASC->channelsConfiguration == 1)
{
/* upMatrix to 2 channels for implicit signalling of PS */
mp4ASC->channelsConfiguration = 2;
}
#endif
#ifdef SBR_DEC
mp4ASC->sbr_present_flag = -1;
if (mp4ASC->objectTypeIndex == 5)
{
uint8_t tmp;
mp4ASC->sbr_present_flag = 1;
tmp = (uint8_t)faad_getbits(&ld, 4
DEBUGVAR(1,5,"parse_audio_decoder_specific_info(): extensionSamplingFrequencyIndex"));
/* check for downsampled SBR */
if (tmp == mp4ASC->samplingFrequencyIndex)
mp4ASC->downSampledSBR = 1;
mp4ASC->samplingFrequencyIndex = tmp;
if (mp4ASC->samplingFrequencyIndex == 15)
{
mp4ASC->samplingFrequency = (uint32_t)faad_getbits(&ld, 24
DEBUGVAR(1,6,"parse_audio_decoder_specific_info(): extensionSamplingFrequencyIndex"));
} else {
mp4ASC->samplingFrequency = get_sample_rate(mp4ASC->samplingFrequencyIndex);
}
mp4ASC->objectTypeIndex = (uint8_t)faad_getbits(&ld, 5
DEBUGVAR(1,7,"parse_audio_decoder_specific_info(): ObjectTypeIndex"));
}
#endif
/* get GASpecificConfig */
if (mp4ASC->objectTypeIndex == 1 || mp4ASC->objectTypeIndex == 2 ||
mp4ASC->objectTypeIndex == 3 || mp4ASC->objectTypeIndex == 4 ||
mp4ASC->objectTypeIndex == 6 || mp4ASC->objectTypeIndex == 7)
{
result = GASpecificConfig(&ld, mp4ASC, pce);
#ifdef ERROR_RESILIENCE
} else if (mp4ASC->objectTypeIndex >= ER_OBJECT_START) { /* ER */
result = GASpecificConfig(&ld, mp4ASC, pce);
mp4ASC->epConfig = (uint8_t)faad_getbits(&ld, 2
DEBUGVAR(1,143,"parse_audio_decoder_specific_info(): epConfig"));
if (mp4ASC->epConfig != 0)
result = -5;
#endif
} else {
result = -4;
}
#ifdef SSR_DEC
/* shorter frames not allowed for SSR */
if ((mp4ASC->objectTypeIndex == 4) && mp4ASC->frameLengthFlag)
return -6;
#endif
#ifdef SBR_DEC
bits_to_decode = (int8_t)(buffer_size*8 - faad_get_processed_bits(&ld));
if ((mp4ASC->objectTypeIndex != 5) && (bits_to_decode >= 16))
{
int16_t syncExtensionType = (int16_t)faad_getbits(&ld, 11
DEBUGVAR(1,9,"parse_audio_decoder_specific_info(): syncExtensionType"));
if (syncExtensionType == 0x2b7)
{
mp4ASC->objectTypeIndex = (uint8_t)faad_getbits(&ld, 5
DEBUGVAR(1,10,"parse_audio_decoder_specific_info(): extensionAudioObjectType"));
if (mp4ASC->objectTypeIndex == 5)
{
mp4ASC->sbr_present_flag = (uint8_t)faad_get1bit(&ld
DEBUGVAR(1,11,"parse_audio_decoder_specific_info(): sbr_present_flag"));
if (mp4ASC->sbr_present_flag)
{
uint8_t tmp;
tmp = (uint8_t)faad_getbits(&ld, 4
DEBUGVAR(1,12,"parse_audio_decoder_specific_info(): extensionSamplingFrequencyIndex"));
/* check for downsampled SBR */
if (tmp == mp4ASC->samplingFrequencyIndex)
mp4ASC->downSampledSBR = 1;
mp4ASC->samplingFrequencyIndex = tmp;
if (mp4ASC->samplingFrequencyIndex == 15)
{
mp4ASC->samplingFrequency = (uint32_t)faad_getbits(&ld, 24
DEBUGVAR(1,13,"parse_audio_decoder_specific_info(): extensionSamplingFrequencyIndex"));
} else {
mp4ASC->samplingFrequency = get_sample_rate(mp4ASC->samplingFrequencyIndex);
}
}
}
}
}
/* no SBR signalled, this could mean either implicit signalling or no SBR in this file */
/* MPEG specification states: assume SBR on files with samplerate <= 24000 Hz */
if (mp4ASC->sbr_present_flag == -1)
{
if (mp4ASC->samplingFrequency <= 24000)
{
mp4ASC->samplingFrequency *= 2;
mp4ASC->forceUpSampling = 1;
} else /* > 24000*/ {
mp4ASC->downSampledSBR = 1;
}
}
#endif
faad_endbits(&ld);
return result;
}