ref: 82bc6ccd76179f01824177ed8b7ce5905ec929e2
dir: /libfaad/mp4.c/
/* ** FAAD - Freeware Advanced Audio Decoder ** Copyright (C) 2002 M. Bakker ** ** 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. ** ** $Id: mp4.c,v 1.13 2002/11/28 18:48:30 menno Exp $ **/ #include "common.h" #include "structs.h" #include "bits.h" #include "mp4.h" #include "data.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 0, /* 5 Reserved */ 0, /* 6 AAC Scalable */ 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 0, /* 20 ER AAC scalable */ 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 FAADAPI AudioSpecificConfig(uint8_t *pBuffer, uint32_t buffer_size, uint32_t *samplerate, uint8_t *channels, uint8_t *sf_index, uint8_t *object_type, uint8_t *aacSectionDataResilienceFlag, uint8_t *aacScalefactorDataResilienceFlag, uint8_t *aacSpectralDataResilienceFlag, uint8_t *frameLengthFlag) { bitfile ld; uint8_t ep_config = 0; int8_t result = 0; uint8_t ObjectTypeIndex, SamplingFrequencyIndex, ChannelsConfiguration; faad_initbits(&ld, pBuffer, buffer_size); faad_byte_align(&ld); ObjectTypeIndex = (uint8_t)faad_getbits(&ld, 5 DEBUGVAR(1,1,"parse_audio_decoder_specific_info(): ObjectTypeIndex")); SamplingFrequencyIndex = (uint8_t)faad_getbits(&ld, 4 DEBUGVAR(1,2,"parse_audio_decoder_specific_info(): SamplingFrequencyIndex")); ChannelsConfiguration = (uint8_t)faad_getbits(&ld, 4 DEBUGVAR(1,3,"parse_audio_decoder_specific_info(): ChannelsConfiguration")); *samplerate = sample_rates[SamplingFrequencyIndex]; *channels = ChannelsConfiguration; *sf_index = SamplingFrequencyIndex; *object_type = ObjectTypeIndex; if (ObjectTypesTable[ObjectTypeIndex] != 1) { faad_endbits(&ld); return -1; } if (*samplerate == 0) { faad_endbits(&ld); return -2; } if (ChannelsConfiguration > 7) { faad_endbits(&ld); return -3; } /* get GASpecificConfig */ if (ObjectTypeIndex == 1 || ObjectTypeIndex == 2 || ObjectTypeIndex == 3 || ObjectTypeIndex == 4 || ObjectTypeIndex == 6 || ObjectTypeIndex == 7) { result = GASpecificConfig(&ld, channels, ObjectTypeIndex, #ifdef ERROR_RESILIENCE aacSectionDataResilienceFlag, aacScalefactorDataResilienceFlag, aacSpectralDataResilienceFlag, #endif frameLengthFlag); #ifdef ERROR_RESILIENCE } else if (ObjectTypeIndex >= ER_OBJECT_START) { /* ER */ result = GASpecificConfig(&ld, channels, ObjectTypeIndex, #ifdef ERROR_RESILIENCE aacSectionDataResilienceFlag, aacScalefactorDataResilienceFlag, aacSpectralDataResilienceFlag, #endif frameLengthFlag); ep_config = (uint8_t)faad_getbits(&ld, 2 DEBUGVAR(1,143,"parse_audio_decoder_specific_info(): epConfig")); if (ep_config != 0) result = -5; #endif } else { result = -4; } #ifdef SSR_DEC /* shorter frames not allowed for SSR */ if ((ObjectTypeIndex == 4) && *frameLengthFlag) return -6; #endif faad_endbits(&ld); return result; }