/* ** 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 #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, 0); } int8_t AudioSpecificConfigFromBitfile(bitfile *ld, mp4AudioSpecificConfig *mp4ASC, program_config *pce, uint32_t buffer_size, uint8_t short_form) { int8_t result = 0; uint32_t startpos = faad_get_processed_bits(ld); #ifdef SBR_DEC int8_t bits_to_decode = 0; #endif if (mp4ASC == NULL) return -8; memset(mp4ASC, 0, sizeof(mp4AudioSpecificConfig)); 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")); if(mp4ASC->samplingFrequencyIndex==0x0f) faad_getbits(ld, 24); 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) { return -1; } if (mp4ASC->samplingFrequency == 0) { return -2; } if (mp4ASC->channelsConfiguration > 7) { 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 if(short_form) bits_to_decode = 0; else bits_to_decode = (int8_t)(buffer_size*8 - (startpos-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 return result; } int8_t AudioSpecificConfig2(uint8_t *pBuffer, uint32_t buffer_size, mp4AudioSpecificConfig *mp4ASC, program_config *pce, uint8_t short_form) { uint8_t ret = 0; bitfile ld; faad_initbits(&ld, pBuffer, buffer_size); faad_byte_align(&ld); ret = AudioSpecificConfigFromBitfile(&ld, mp4ASC, pce, buffer_size, short_form); faad_endbits(&ld); return ret; }