CARPLAY版本整理

MXC_A27-PCB4.5-270T/lib/faad2/libfaad/mp4.c

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+/*
+** 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 1.41 2016/11/11 11:25:58 knik 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 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 == (char)-1) /* cannot be -1 on systems with unsigned char */
+    {
+        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;
+}