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AAC Encode

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17 Feb 2012CPOL3 min read 67K   5K   27  
Raw Audio data is encoded to AAC compression using ffmmpeg library.
 
/*
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVUTIL_INTREADWRITE_H
#define AVUTIL_INTREADWRITE_H

#include <stdint.h>
#include "libavutil/avconfig.h"
#include "attributes.h"
#include "bswap.h"

typedef union {
    uint64_t u64;
    uint32_t u32[2];
    uint16_t u16[4];
    uint8_t  u8 [8];
    double   f64;
    float    f32[2];
} av_alias av_alias64;

typedef union {
    uint32_t u32;
    uint16_t u16[2];
    uint8_t  u8 [4];
    float    f32;
} av_alias av_alias32;

typedef union {
    uint16_t u16;
    uint8_t  u8 [2];
} av_alias av_alias16;

/*
 * Arch-specific headers can provide any combination of
 * AV_[RW][BLN](16|24|32|64) and AV_(COPY|SWAP|ZERO)(64|128) macros.
 * Preprocessor symbols must be defined, even if these are implemented
 * as inline functions.
 */

#ifdef HAVE_AV_CONFIG_H

#include "config.h"

#if   ARCH_ARM
#   include "arm/intreadwrite.h"
#elif ARCH_AVR32
#   include "avr32/intreadwrite.h"
#elif ARCH_MIPS
#   include "mips/intreadwrite.h"
#elif ARCH_PPC
#   include "ppc/intreadwrite.h"
#elif ARCH_TOMI
#   include "tomi/intreadwrite.h"
#elif ARCH_X86
#   include "x86/intreadwrite.h"
#endif

#endif /* HAVE_AV_CONFIG_H */

/*
 * Map AV_RNXX <-> AV_R[BL]XX for all variants provided by per-arch headers.
 */

#if AV_HAVE_BIGENDIAN

#   if    defined(AV_RN16) && !defined(AV_RB16)
#       define AV_RB16(p) AV_RN16(p)
#   elif !defined(AV_RN16) &&  defined(AV_RB16)
#       define AV_RN16(p) AV_RB16(p)
#   endif

#   if    defined(AV_WN16) && !defined(AV_WB16)
#       define AV_WB16(p, v) AV_WN16(p, v)
#   elif !defined(AV_WN16) &&  defined(AV_WB16)
#       define AV_WN16(p, v) AV_WB16(p, v)
#   endif

#   if    defined(AV_RN24) && !defined(AV_RB24)
#       define AV_RB24(p) AV_RN24(p)
#   elif !defined(AV_RN24) &&  defined(AV_RB24)
#       define AV_RN24(p) AV_RB24(p)
#   endif

#   if    defined(AV_WN24) && !defined(AV_WB24)
#       define AV_WB24(p, v) AV_WN24(p, v)
#   elif !defined(AV_WN24) &&  defined(AV_WB24)
#       define AV_WN24(p, v) AV_WB24(p, v)
#   endif

#   if    defined(AV_RN32) && !defined(AV_RB32)
#       define AV_RB32(p) AV_RN32(p)
#   elif !defined(AV_RN32) &&  defined(AV_RB32)
#       define AV_RN32(p) AV_RB32(p)
#   endif

#   if    defined(AV_WN32) && !defined(AV_WB32)
#       define AV_WB32(p, v) AV_WN32(p, v)
#   elif !defined(AV_WN32) &&  defined(AV_WB32)
#       define AV_WN32(p, v) AV_WB32(p, v)
#   endif

#   if    defined(AV_RN64) && !defined(AV_RB64)
#       define AV_RB64(p) AV_RN64(p)
#   elif !defined(AV_RN64) &&  defined(AV_RB64)
#       define AV_RN64(p) AV_RB64(p)
#   endif

#   if    defined(AV_WN64) && !defined(AV_WB64)
#       define AV_WB64(p, v) AV_WN64(p, v)
#   elif !defined(AV_WN64) &&  defined(AV_WB64)
#       define AV_WN64(p, v) AV_WB64(p, v)
#   endif

#else /* AV_HAVE_BIGENDIAN */

#   if    defined(AV_RN16) && !defined(AV_RL16)
#       define AV_RL16(p) AV_RN16(p)
#   elif !defined(AV_RN16) &&  defined(AV_RL16)
#       define AV_RN16(p) AV_RL16(p)
#   endif

#   if    defined(AV_WN16) && !defined(AV_WL16)
#       define AV_WL16(p, v) AV_WN16(p, v)
#   elif !defined(AV_WN16) &&  defined(AV_WL16)
#       define AV_WN16(p, v) AV_WL16(p, v)
#   endif

#   if    defined(AV_RN24) && !defined(AV_RL24)
#       define AV_RL24(p) AV_RN24(p)
#   elif !defined(AV_RN24) &&  defined(AV_RL24)
#       define AV_RN24(p) AV_RL24(p)
#   endif

#   if    defined(AV_WN24) && !defined(AV_WL24)
#       define AV_WL24(p, v) AV_WN24(p, v)
#   elif !defined(AV_WN24) &&  defined(AV_WL24)
#       define AV_WN24(p, v) AV_WL24(p, v)
#   endif

#   if    defined(AV_RN32) && !defined(AV_RL32)
#       define AV_RL32(p) AV_RN32(p)
#   elif !defined(AV_RN32) &&  defined(AV_RL32)
#       define AV_RN32(p) AV_RL32(p)
#   endif

#   if    defined(AV_WN32) && !defined(AV_WL32)
#       define AV_WL32(p, v) AV_WN32(p, v)
#   elif !defined(AV_WN32) &&  defined(AV_WL32)
#       define AV_WN32(p, v) AV_WL32(p, v)
#   endif

#   if    defined(AV_RN64) && !defined(AV_RL64)
#       define AV_RL64(p) AV_RN64(p)
#   elif !defined(AV_RN64) &&  defined(AV_RL64)
#       define AV_RN64(p) AV_RL64(p)
#   endif

#   if    defined(AV_WN64) && !defined(AV_WL64)
#       define AV_WL64(p, v) AV_WN64(p, v)
#   elif !defined(AV_WN64) &&  defined(AV_WL64)
#       define AV_WN64(p, v) AV_WL64(p, v)
#   endif

#endif /* !AV_HAVE_BIGENDIAN */

/*
 * Define AV_[RW]N helper macros to simplify definitions not provided
 * by per-arch headers.
 */

#if defined(__GNUC__) && !defined(__TI_COMPILER_VERSION__)

union unaligned_64 { uint64_t l; } __attribute__((packed)) av_alias;
union unaligned_32 { uint32_t l; } __attribute__((packed)) av_alias;
union unaligned_16 { uint16_t l; } __attribute__((packed)) av_alias;

#   define AV_RN(s, p) (((const union unaligned_##s *) (p))->l)
#   define AV_WN(s, p, v) ((((union unaligned_##s *) (p))->l) = (v))

#elif defined(__DECC)

#   define AV_RN(s, p) (*((const __unaligned uint##s##_t*)(p)))
#   define AV_WN(s, p, v) (*((__unaligned uint##s##_t*)(p)) = (v))

#elif AV_HAVE_FAST_UNALIGNED

#   define AV_RN(s, p) (((const av_alias##s*)(p))->u##s)
#   define AV_WN(s, p, v) (((av_alias##s*)(p))->u##s = (v))

#else

#ifndef AV_RB16
#   define AV_RB16(x)                           \
    ((((const uint8_t*)(x))[0] << 8) |          \
      ((const uint8_t*)(x))[1])
#endif
#ifndef AV_WB16
#   define AV_WB16(p, d) do {                   \
        ((uint8_t*)(p))[1] = (d);               \
        ((uint8_t*)(p))[0] = (d)>>8;            \
    } while(0)
#endif

#ifndef AV_RL16
#   define AV_RL16(x)                           \
    ((((const uint8_t*)(x))[1] << 8) |          \
      ((const uint8_t*)(x))[0])
#endif
#ifndef AV_WL16
#   define AV_WL16(p, d) do {                   \
        ((uint8_t*)(p))[0] = (d);               \
        ((uint8_t*)(p))[1] = (d)>>8;            \
    } while(0)
#endif

#ifndef AV_RB32
#   define AV_RB32(x)                                \
    (((uint32_t)((const uint8_t*)(x))[0] << 24) |    \
               (((const uint8_t*)(x))[1] << 16) |    \
               (((const uint8_t*)(x))[2] <<  8) |    \
                ((const uint8_t*)(x))[3])
#endif
#ifndef AV_WB32
#   define AV_WB32(p, d) do {                   \
        ((uint8_t*)(p))[3] = (d);               \
        ((uint8_t*)(p))[2] = (d)>>8;            \
        ((uint8_t*)(p))[1] = (d)>>16;           \
        ((uint8_t*)(p))[0] = (d)>>24;           \
    } while(0)
#endif

#ifndef AV_RL32
#   define AV_RL32(x)                                \
    (((uint32_t)((const uint8_t*)(x))[3] << 24) |    \
               (((const uint8_t*)(x))[2] << 16) |    \
               (((const uint8_t*)(x))[1] <<  8) |    \
                ((const uint8_t*)(x))[0])
#endif
#ifndef AV_WL32
#   define AV_WL32(p, d) do {                   \
        ((uint8_t*)(p))[0] = (d);               \
        ((uint8_t*)(p))[1] = (d)>>8;            \
        ((uint8_t*)(p))[2] = (d)>>16;           \
        ((uint8_t*)(p))[3] = (d)>>24;           \
    } while(0)
#endif

#ifndef AV_RB64
#   define AV_RB64(x)                                   \
    (((uint64_t)((const uint8_t*)(x))[0] << 56) |       \
     ((uint64_t)((const uint8_t*)(x))[1] << 48) |       \
     ((uint64_t)((const uint8_t*)(x))[2] << 40) |       \
     ((uint64_t)((const uint8_t*)(x))[3] << 32) |       \
     ((uint64_t)((const uint8_t*)(x))[4] << 24) |       \
     ((uint64_t)((const uint8_t*)(x))[5] << 16) |       \
     ((uint64_t)((const uint8_t*)(x))[6] <<  8) |       \
      (uint64_t)((const uint8_t*)(x))[7])
#endif
#ifndef AV_WB64
#   define AV_WB64(p, d) do {                   \
        ((uint8_t*)(p))[7] = (d);               \
        ((uint8_t*)(p))[6] = (d)>>8;            \
        ((uint8_t*)(p))[5] = (d)>>16;           \
        ((uint8_t*)(p))[4] = (d)>>24;           \
        ((uint8_t*)(p))[3] = (d)>>32;           \
        ((uint8_t*)(p))[2] = (d)>>40;           \
        ((uint8_t*)(p))[1] = (d)>>48;           \
        ((uint8_t*)(p))[0] = (d)>>56;           \
    } while(0)
#endif

#ifndef AV_RL64
#   define AV_RL64(x)                                   \
    (((uint64_t)((const uint8_t*)(x))[7] << 56) |       \
     ((uint64_t)((const uint8_t*)(x))[6] << 48) |       \
     ((uint64_t)((const uint8_t*)(x))[5] << 40) |       \
     ((uint64_t)((const uint8_t*)(x))[4] << 32) |       \
     ((uint64_t)((const uint8_t*)(x))[3] << 24) |       \
     ((uint64_t)((const uint8_t*)(x))[2] << 16) |       \
     ((uint64_t)((const uint8_t*)(x))[1] <<  8) |       \
      (uint64_t)((const uint8_t*)(x))[0])
#endif
#ifndef AV_WL64
#   define AV_WL64(p, d) do {                   \
        ((uint8_t*)(p))[0] = (d);               \
        ((uint8_t*)(p))[1] = (d)>>8;            \
        ((uint8_t*)(p))[2] = (d)>>16;           \
        ((uint8_t*)(p))[3] = (d)>>24;           \
        ((uint8_t*)(p))[4] = (d)>>32;           \
        ((uint8_t*)(p))[5] = (d)>>40;           \
        ((uint8_t*)(p))[6] = (d)>>48;           \
        ((uint8_t*)(p))[7] = (d)>>56;           \
    } while(0)
#endif

#if AV_HAVE_BIGENDIAN
#   define AV_RN(s, p)    AV_RB##s(p)
#   define AV_WN(s, p, v) AV_WB##s(p, v)
#else
#   define AV_RN(s, p)    AV_RL##s(p)
#   define AV_WN(s, p, v) AV_WL##s(p, v)
#endif

#endif /* HAVE_FAST_UNALIGNED */

#ifndef AV_RN16
#   define AV_RN16(p) AV_RN(16, p)
#endif

#ifndef AV_RN32
#   define AV_RN32(p) AV_RN(32, p)
#endif

#ifndef AV_RN64
#   define AV_RN64(p) AV_RN(64, p)
#endif

#ifndef AV_WN16
#   define AV_WN16(p, v) AV_WN(16, p, v)
#endif

#ifndef AV_WN32
#   define AV_WN32(p, v) AV_WN(32, p, v)
#endif

#ifndef AV_WN64
#   define AV_WN64(p, v) AV_WN(64, p, v)
#endif

#if AV_HAVE_BIGENDIAN
#   define AV_RB(s, p)    AV_RN##s(p)
#   define AV_WB(s, p, v) AV_WN##s(p, v)
#   define AV_RL(s, p)    av_bswap##s(AV_RN##s(p))
#   define AV_WL(s, p, v) AV_WN##s(p, av_bswap##s(v))
#else
#   define AV_RB(s, p)    av_bswap##s(AV_RN##s(p))
#   define AV_WB(s, p, v) AV_WN##s(p, av_bswap##s(v))
#   define AV_RL(s, p)    AV_RN##s(p)
#   define AV_WL(s, p, v) AV_WN##s(p, v)
#endif

#define AV_RB8(x)     (((const uint8_t*)(x))[0])
#define AV_WB8(p, d)  do { ((uint8_t*)(p))[0] = (d); } while(0)

#define AV_RL8(x)     AV_RB8(x)
#define AV_WL8(p, d)  AV_WB8(p, d)

#ifndef AV_RB16
#   define AV_RB16(p)    AV_RB(16, p)
#endif
#ifndef AV_WB16
#   define AV_WB16(p, v) AV_WB(16, p, v)
#endif

#ifndef AV_RL16
#   define AV_RL16(p)    AV_RL(16, p)
#endif
#ifndef AV_WL16
#   define AV_WL16(p, v) AV_WL(16, p, v)
#endif

#ifndef AV_RB32
#   define AV_RB32(p)    AV_RB(32, p)
#endif
#ifndef AV_WB32
#   define AV_WB32(p, v) AV_WB(32, p, v)
#endif

#ifndef AV_RL32
#   define AV_RL32(p)    AV_RL(32, p)
#endif
#ifndef AV_WL32
#   define AV_WL32(p, v) AV_WL(32, p, v)
#endif

#ifndef AV_RB64
#   define AV_RB64(p)    AV_RB(64, p)
#endif
#ifndef AV_WB64
#   define AV_WB64(p, v) AV_WB(64, p, v)
#endif

#ifndef AV_RL64
#   define AV_RL64(p)    AV_RL(64, p)
#endif
#ifndef AV_WL64
#   define AV_WL64(p, v) AV_WL(64, p, v)
#endif

#ifndef AV_RB24
#   define AV_RB24(x)                           \
    ((((const uint8_t*)(x))[0] << 16) |         \
     (((const uint8_t*)(x))[1] <<  8) |         \
      ((const uint8_t*)(x))[2])
#endif
#ifndef AV_WB24
#   define AV_WB24(p, d) do {                   \
        ((uint8_t*)(p))[2] = (d);               \
        ((uint8_t*)(p))[1] = (d)>>8;            \
        ((uint8_t*)(p))[0] = (d)>>16;           \
    } while(0)
#endif

#ifndef AV_RL24
#   define AV_RL24(x)                           \
    ((((const uint8_t*)(x))[2] << 16) |         \
     (((const uint8_t*)(x))[1] <<  8) |         \
      ((const uint8_t*)(x))[0])
#endif
#ifndef AV_WL24
#   define AV_WL24(p, d) do {                   \
        ((uint8_t*)(p))[0] = (d);               \
        ((uint8_t*)(p))[1] = (d)>>8;            \
        ((uint8_t*)(p))[2] = (d)>>16;           \
    } while(0)
#endif

/*
 * The AV_[RW]NA macros access naturally aligned data
 * in a type-safe way.
 */

#define AV_RNA(s, p)    (((const av_alias##s*)(p))->u##s)
#define AV_WNA(s, p, v) (((av_alias##s*)(p))->u##s = (v))

#ifndef AV_RN16A
#   define AV_RN16A(p) AV_RNA(16, p)
#endif

#ifndef AV_RN32A
#   define AV_RN32A(p) AV_RNA(32, p)
#endif

#ifndef AV_RN64A
#   define AV_RN64A(p) AV_RNA(64, p)
#endif

#ifndef AV_WN16A
#   define AV_WN16A(p, v) AV_WNA(16, p, v)
#endif

#ifndef AV_WN32A
#   define AV_WN32A(p, v) AV_WNA(32, p, v)
#endif

#ifndef AV_WN64A
#   define AV_WN64A(p, v) AV_WNA(64, p, v)
#endif

/* Parameters for AV_COPY*, AV_SWAP*, AV_ZERO* must be
 * naturally aligned. They may be implemented using MMX,
 * so emms_c() must be called before using any float code
 * afterwards.
 */

#define AV_COPY(n, d, s) \
    (((av_alias##n*)(d))->u##n = ((const av_alias##n*)(s))->u##n)

#ifndef AV_COPY16
#   define AV_COPY16(d, s) AV_COPY(16, d, s)
#endif

#ifndef AV_COPY32
#   define AV_COPY32(d, s) AV_COPY(32, d, s)
#endif

#ifndef AV_COPY64
#   define AV_COPY64(d, s) AV_COPY(64, d, s)
#endif

#ifndef AV_COPY128
#   define AV_COPY128(d, s)                    \
    do {                                       \
        AV_COPY64(d, s);                       \
        AV_COPY64((char*)(d)+8, (char*)(s)+8); \
    } while(0)
#endif

#define AV_SWAP(n, a, b) FFSWAP(av_alias##n, *(av_alias##n*)(a), *(av_alias##n*)(b))

#ifndef AV_SWAP64
#   define AV_SWAP64(a, b) AV_SWAP(64, a, b)
#endif

#define AV_ZERO(n, d) (((av_alias##n*)(d))->u##n = 0)

#ifndef AV_ZERO16
#   define AV_ZERO16(d) AV_ZERO(16, d)
#endif

#ifndef AV_ZERO32
#   define AV_ZERO32(d) AV_ZERO(32, d)
#endif

#ifndef AV_ZERO64
#   define AV_ZERO64(d) AV_ZERO(64, d)
#endif

#ifndef AV_ZERO128
#   define AV_ZERO128(d)         \
    do {                         \
        AV_ZERO64(d);            \
        AV_ZERO64((char*)(d)+8); \
    } while(0)
#endif

#endif /* AVUTIL_INTREADWRITE_H */

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Written By
potluri_suresh
Software Developer (Senior) 3k Techonologies
United States United States
Suresh Potluri has worked in Windows device drivers, Solid experience in NDIS Layer, developed many NDIS Miniport drivers. Extensive experience in developing NDIS miniport drivers, building WHQL/DTM setup, clearing all WHQL/DTM tests, and subsequently getting device signature/logo process for the developed drivers. He also was also solely responsible for debugging traps and blue screens for a number of years.
he also worked on many PCI based boards, developed Board support packages, Vx-Works firmware for Power PC, firmware for ARM based boards for Wireless LAN devices.

he is interested in Embedded, NDIS, MPEG.

Previously worked in Tandberg TV, Sunnyvale, Chlesio Communications, Sunnyvale, Hellosoft, Hyderabad.

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Posted 17 Feb 2012

Article Copyright 2012 by potluri_suresh
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