From cc2160de5cc05dc3aa77f3a34358e66f6193c8c9 Mon Sep 17 00:00:00 2001 From: Michał Cichoń Date: Tue, 26 Jun 2012 20:35:30 +0200 Subject: Add support for AAC. --- faad2/src/libfaad/mp4.c | 309 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 309 insertions(+) create mode 100644 faad2/src/libfaad/mp4.c (limited to 'faad2/src/libfaad/mp4.c') diff --git a/faad2/src/libfaad/mp4.c b/faad2/src/libfaad/mp4.c new file mode 100644 index 0000000..8972a7a --- /dev/null +++ b/faad2/src/libfaad/mp4.c @@ -0,0 +1,309 @@ +/* +** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding +** Copyright (C) 2003-2005 M. Bakker, Nero 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. +** +** The "appropriate copyright message" mentioned in section 2c of the GPLv2 +** must read: "Code from FAAD2 is copyright (c) Nero AG, www.nero.com" +** +** Commercial non-GPL licensing of this software is possible. +** For more info contact Nero AG through Mpeg4AAClicense@nero.com. +** +** $Id: mp4.c,v 1.40 2009/02/06 03:39:58 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 + 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 */ +char NEAACDECAPI NeAACDecAudioSpecificConfig(unsigned char *pBuffer, + unsigned long 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) + { + uint8_t tmp_OTi = (uint8_t)faad_getbits(ld, 5 + DEBUGVAR(1,10,"parse_audio_decoder_specific_info(): extensionAudioObjectType")); + + if (tmp_OTi == 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; + + /* Don't set OT to SBR until checked that it is actually there */ + mp4ASC->objectTypeIndex = tmp_OTi; + + 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; +} + +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; +} -- cgit v1.2.3