File content as of revision 47:9e361da97763:

#ifndef RDA_MP4_H
#define RDA_MP4_H

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

#include "mp4ff_int_types.h"
#include <stdlib.h>
#include "rda_log.h"

#define INLINE 			__inline
//#define NULL            ((void *) 0)

#define SBR_DEC
//#define PS_DEC

#define MAIN       1
#define LC         2
#define SSR        3
#define LTP        4
#define HE_AAC     5
#define LD        23
#define ER_LC     17
#define ER_LTP    19
#define DRM_ER_LC 27 /* special object type for DRM */

/* header types */
#define RAW        0
#define ADIF       1
#define ADTS       2
#define LATM       3

/* SBR signalling */
#define NO_SBR           0
#define SBR_UPSAMPLED    1
#define SBR_DOWNSAMPLED  2
#define NO_SBR_UPSAMPLED 3

/* First object type that has ER */
#define ER_OBJECT_START 17

typedef struct _bitfile
{
    /* bit input */
    uint32_t bufa;
    uint32_t bufb;
    uint32_t bits_left;
    uint32_t buffer_size; /* size of the buffer in bytes */
    uint32_t bytes_left;
    uint8_t error;
    uint32_t *tail;
    uint32_t *start;
    const void *buffer;
} bitfile;

typedef struct mp4AudioSpecificConfig
{
    /* Audio Specific Info */
    unsigned char objectTypeIndex;
    unsigned char samplingFrequencyIndex;
    unsigned long samplingFrequency;
    unsigned char channelsConfiguration;

    /* GA Specific Info */
    unsigned char frameLengthFlag;
    unsigned char dependsOnCoreCoder;
    unsigned short coreCoderDelay;
    unsigned char extensionFlag;
    unsigned char aacSectionDataResilienceFlag;
    unsigned char aacScalefactorDataResilienceFlag;
    unsigned char aacSpectralDataResilienceFlag;
    unsigned char epConfig;

    char sbr_present_flag;
    char ps_present_flag;
    char forceUpSampling;
    char downSampledSBR;
} mp4AudioSpecificConfig;

/* circumvent memory alignment errors on ARM */
static INLINE uint32_t getdword(void *mem)
{
    uint32_t tmp;
#ifndef ARCH_IS_BIG_ENDIAN
    ((uint8_t*)&tmp)[0] = ((uint8_t*)mem)[3];
    ((uint8_t*)&tmp)[1] = ((uint8_t*)mem)[2];
    ((uint8_t*)&tmp)[2] = ((uint8_t*)mem)[1];
    ((uint8_t*)&tmp)[3] = ((uint8_t*)mem)[0];
#else
    ((uint8_t*)&tmp)[0] = ((uint8_t*)mem)[0];
    ((uint8_t*)&tmp)[1] = ((uint8_t*)mem)[1];
    ((uint8_t*)&tmp)[2] = ((uint8_t*)mem)[2];
    ((uint8_t*)&tmp)[3] = ((uint8_t*)mem)[3];
#endif

    return tmp;
}

/* reads only n bytes from the stream instead of the standard 4 */
static /*INLINE*/ uint32_t getdword_n(void *mem, int n)
{
    uint32_t tmp = 0;
#ifndef ARCH_IS_BIG_ENDIAN
    switch (n)
    {
    case 3:
        ((uint8_t*)&tmp)[1] = ((uint8_t*)mem)[2];
    case 2:
        ((uint8_t*)&tmp)[2] = ((uint8_t*)mem)[1];
    case 1:
        ((uint8_t*)&tmp)[3] = ((uint8_t*)mem)[0];
    default:
        break;
    }
#else
    switch (n)
    {
    case 3:
        ((uint8_t*)&tmp)[2] = ((uint8_t*)mem)[2];
    case 2:
        ((uint8_t*)&tmp)[1] = ((uint8_t*)mem)[1];
    case 1:
        ((uint8_t*)&tmp)[0] = ((uint8_t*)mem)[0];
    default:
        break;
    }
#endif

    return tmp;
}

static INLINE uint32_t faad_showbits(bitfile *ld, uint32_t bits)
{
    if (bits <= ld->bits_left)
    {
        //return (ld->bufa >> (ld->bits_left - bits)) & bitmask[bits];
        return (ld->bufa << (32 - ld->bits_left)) >> (32 - bits);
    }

    bits -= ld->bits_left;
    //return ((ld->bufa & bitmask[ld->bits_left]) << bits) | (ld->bufb >> (32 - bits));
    return ((ld->bufa & ((1<<ld->bits_left)-1)) << bits) | (ld->bufb >> (32 - bits));
}

static /*INLINE*/ void faad_flushbits_ex(bitfile *ld, uint32_t bits)
{
    uint32_t tmp;

    ld->bufa = ld->bufb;
    if (ld->bytes_left >= 4)
    {
        tmp = getdword(ld->tail);
        ld->bytes_left -= 4;
    } else {
        tmp = getdword_n(ld->tail, ld->bytes_left);
        ld->bytes_left = 0;
    }
    ld->bufb = tmp;
    ld->tail++;
    ld->bits_left += (32 - bits);
}

static INLINE void faad_flushbits(bitfile *ld, uint32_t bits)
{
    /* do nothing if error */
    if (ld->error != 0)
        return;

    if (bits < ld->bits_left)
    {
        ld->bits_left -= bits;
    } else {
        faad_flushbits_ex(ld, bits);
    }
}

/* return next n bits (right adjusted) */
static /*INLINE*/ uint32_t faad_getbits(bitfile *ld, uint32_t n)
{
    uint32_t ret;

    if (n == 0)
        return 0;

    ret = faad_showbits(ld, n);
    faad_flushbits(ld, n);

    return ret;
}

static INLINE uint8_t faad_get1bit(bitfile *ld)
{
    uint8_t r;

    if (ld->bits_left > 0)
    {
        ld->bits_left--;
        r = (uint8_t)((ld->bufa >> ld->bits_left) & 1);
        return r;
    }

    /* bits_left == 0 */
#if 0
    r = (uint8_t)(ld->bufb >> 31);
    faad_flushbits_ex(ld, 1);
#else
    r = (uint8_t)faad_getbits(ld, 1);
#endif
    return r;
}

void faad_initbits(bitfile *ld, const void *_buffer, const uint32_t buffer_size);
uint8_t faad_byte_align(bitfile *ld);
void faad_endbits(bitfile *ld);
uint32_t faad_get_processed_bits(bitfile *ld);
uint32_t get_sample_rate(const uint8_t sr_index);
int8_t rda_GASpecificConfig(bitfile *ld, mp4AudioSpecificConfig *mp4ASC);
int8_t rda_AudioSpecificConfigFromBitfile(bitfile *ld, mp4AudioSpecificConfig *mp4ASC, uint32_t buffer_size, uint8_t short_form);
int8_t rda_AudioSpecificConfig2(uint8_t *pBuffer, uint32_t buffer_size, mp4AudioSpecificConfig *mp4ASC, uint8_t short_form);
int32_t rda_MakeAdtsHeader(unsigned char *data, int size, mp4AudioSpecificConfig *mp4ASC);
uint32_t read_callback(void *user_data, void *buffer, uint32_t length);
uint32_t seek_callback(void *user_data, uint64_t position);

#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif