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