diff options
Diffstat (limited to 'faad2/src/libfaad/mp4.c')
| -rw-r--r-- | faad2/src/libfaad/mp4.c | 309 |
1 files changed, 309 insertions, 0 deletions
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 <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
+ 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;
+}
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