dolby_adapt.c

MPEG-4编解码的实现(包括MPEG4视音频编解码)

/************************* MPEG-2 NBC Audio Decoder **************************
 *                                                                           *
"This software module was originally developed by
AT&T, Dolby Laboratories, Fraunhofer Gesellschaft IIS in the course of
development of the MPEG-2 NBC/MPEG-4 Audio standard ISO/IEC 13818-7,
14496-1,2 and 3. This software module is an implementation of a part of one or more
MPEG-2 NBC/MPEG-4 Audio tools as specified by the MPEG-2 NBC/MPEG-4
Audio standard. ISO/IEC  gives users of the MPEG-2 NBC/MPEG-4 Audio
standards free license to this software module or modifications thereof for use in
hardware or software products claiming conformance to the MPEG-2 NBC/MPEG-4
Audio  standards. Those intending to use this software module in hardware or
software products are advised that this use may infringe existing patents.
The original developer of this software module and his/her company, the subsequent
editors and their companies, and ISO/IEC have no liability for use of this software
module or modifications thereof in an implementation. Copyright is not released for
non MPEG-2 NBC/MPEG-4 Audio conforming products.The original developer
retains full right to use the code for his/her  own purpose, assign or donate the
code to a third party and to inhibit third party from using the code for non
MPEG-2 NBC/MPEG-4 Audio conforming products. This copyright notice must
be included in all copies or derivative works."
Copyright(c)1996.
 *                                                                           *
 ****************************************************************************/
/*
 * $Id: dolby_adapt.c,v 1.5 2002/01/09 22:25:41 wmay Exp $
 */

#ifdef WIN32
#include <windows.h>
#endif
#include <stdio.h>
#include <stdlib.h>

#include "all.h"
#include "block.h"
#include "util.h"

#define NORM_TYPE 0
#define START_TYPE 1
#define SHORT_TYPE 2
#define STOP_TYPE 3

/*
*   Interleave Definitions for start and stop blocks
*
*   Start block contains 1 576-pt spectrum (A) and 4 128-pt spectra (B-E)
*     Input spectra are interleaved in repeating segements of 17 bins,
*       9 bins from A (A0-A8), and 2 bins from each of the shorts.
*     Within the segments the bins are interleaved as:
*       A0 A1 A2 A3 A4 B0 C0 D0 E0 A5 A6 A7 A8 B1 C1 D1 E1
*
*   Stop block contains 3 128-pt spectra (A-C) and 1 576-pt spectrum (D)
*     Input spectra are interleaved in repeating segements of 15 bins,
*       2 bins from each of the shorts, and 9 bins from D (D0-D8).
*     Within the segments the bins are interleaved as:
*       A0 B0 C0 D0 D1 D2 D3 D4 A1 B1 C1 D5 D6 D7 D8
*     The last 64 bins are (should be) set to 0.
*/

#define N_SHORT_IN_START 4
#define START_OFFSET 0
#define SHORT_IN_START_OFFSET 5
#define N_SHORT_IN_STOP 3
#define STOP_OFFSET 3
#define SHORT_IN_STOP_OFFSET 0
#define N_SHORT_IN_4STOP    4

/*****************************************************************************
*
*   unfold
*   create full spectrum by reflecting-inverting first half over to second
*   input: see below
*   output: see below
*   local static: none
*   globals: none
*
*****************************************************************************/
void unfold (
    Float *data_in, /* input: 1/2 spectrum */
    Float *data_out,    /* output: full spectrum */
    int inLeng)         /* input: length of input vector */
{
    register int   i;

    /* fill transBuff w/ full MDCT sequence from freqInPtr */
    i=0;
    do
    {

      data_out[i] = *data_in;
      data_out[2*inLeng-i-1] = -(*data_in);
      data_in++;
      i++;

      data_out[i] = *data_in;
      data_out[2*inLeng-i-1] = -(*data_in);
      data_in++;
      i++;

      data_out[i] = *data_in;
      data_out[2*inLeng-i-1] = -(*data_in);
      data_in++;
      i++;

      data_out[i] = *data_in;
      data_out[2*inLeng-i-1] = -(*data_in);
      data_in++;
      i++;

    }while (i<inLeng);
} /* end of unfold */


/*****************************************************************************
*
*   freq2time_adapt
*   transform freq. domain data to time domain.
*   Overlap and add transform output to recreate time sequence.
*   Blocks composed of multiple segments (i.e. all but long) have
*     input spectrums interleaved.
*   input: see below
*   output: see below
*   local static:
*     timeBuff      time domain data fifo
*   globals: none
*
*****************************************************************************/
void freq2time_adapt(faacDecHandle hDecoder,
    byte blockType,         /* input: blockType 0-3                     */
    Wnd_Shape *wnd_shape,   /* input/output                             */
    Float *freqInPtr,       /* input: interleaved spectrum              */
    Float *timeBuff,        /* transform state needed for each channel  */
    Float *ftimeOutPtr)     /* output: 1/2 block of new time values     */
{
    Float *transBuff, *transBuffPtr;
    int             i, j;
    Float           *timeBuffPtr, *destPtr;
    Float *timeOutPtr;

    transBuff = AllocMemory(2*BLOCK_LEN_LONG*sizeof(Float));
    timeOutPtr = AllocMemory(BLOCK_LEN_LONG*sizeof(Float));

    if (blockType == NORM_TYPE)  {
        unfold (freqInPtr, transBuff, BLOCK_LEN_LONG);
        /* Do 1 LONG transform */
        ITransformBlock (hDecoder, transBuff, LONG_BLOCK, wnd_shape, timeBuff); /* ch ); */

        transBuffPtr = transBuff;
        timeBuffPtr = timeBuff;     /*   [ch];  */
        destPtr = timeOutPtr;

    /* idimkovic: reduce loop overhead by unrolling */
    for (i = BLOCK_LEN_LONG/16 - 1; i >= 0; --i)
    {
            *destPtr++ = *transBuffPtr++ + *timeBuffPtr++;
            *destPtr++ = *transBuffPtr++ + *timeBuffPtr++;
            *destPtr++ = *transBuffPtr++ + *timeBuffPtr++;
            *destPtr++ = *transBuffPtr++ + *timeBuffPtr++;
            *destPtr++ = *transBuffPtr++ + *timeBuffPtr++;
            *destPtr++ = *transBuffPtr++ + *timeBuffPtr++;
            *destPtr++ = *transBuffPtr++ + *timeBuffPtr++;
            *destPtr++ = *transBuffPtr++ + *timeBuffPtr++;
            *destPtr++ = *transBuffPtr++ + *timeBuffPtr++;
            *destPtr++ = *transBuffPtr++ + *timeBuffPtr++;
            *destPtr++ = *transBuffPtr++ + *timeBuffPtr++;
            *destPtr++ = *transBuffPtr++ + *timeBuffPtr++;
            *destPtr++ = *transBuffPtr++ + *timeBuffPtr++;
            *destPtr++ = *transBuffPtr++ + *timeBuffPtr++;
            *destPtr++ = *transBuffPtr++ + *timeBuffPtr++;
            *destPtr++ = *transBuffPtr++ + *timeBuffPtr++;

        }

    /* Save second half as old data */
        timeBuffPtr = timeBuff;     /*       [ch];      */
    for (i = BLOCK_LEN_LONG/16 - 1; i >= 0; --i)  {
      *timeBuffPtr++ = *transBuffPtr++; *timeBuffPtr++ = *transBuffPtr++;
      *timeBuffPtr++ = *transBuffPtr++; *timeBuffPtr++ = *transBuffPtr++;
      *timeBuffPtr++ = *transBuffPtr++; *timeBuffPtr++ = *transBuffPtr++;
      *timeBuffPtr++ = *transBuffPtr++; *timeBuffPtr++ = *transBuffPtr++;
      *timeBuffPtr++ = *transBuffPtr++; *timeBuffPtr++ = *transBuffPtr++;
      *timeBuffPtr++ = *transBuffPtr++; *timeBuffPtr++ = *transBuffPtr++;
      *timeBuffPtr++ = *transBuffPtr++; *timeBuffPtr++ = *transBuffPtr++;
      *timeBuffPtr++ = *transBuffPtr++; *timeBuffPtr++ = *transBuffPtr++;
        }
    }

    else if (blockType == SHORT_TYPE)
    {
        /* Do 8 SHORT transforms */

        if (hDecoder->dolbyShortOffset_f2t)
            destPtr = timeBuff + 4 * BLOCK_LEN_SHORT;       /* DBS */
        else
            destPtr = timeBuff + (BLOCK_LEN_LONG - BLOCK_LEN_SHORT) / 2;    /*  448 */

        for (i = 0; i < 8; i++) {
            unfold (freqInPtr, transBuff, BLOCK_LEN_SHORT );
            /*was freqinPtr++, 8 .. mfd */
            freqInPtr += BLOCK_LEN_SHORT;   /*  added mfd   */
            ITransformBlock (hDecoder, transBuff, SHORT_BLOCK, wnd_shape, timeBuff);

            /* Add first half of short window and old data */
            transBuffPtr = transBuff;

      for (j = BLOCK_LEN_SHORT/16-1; j >= 0; --j)  {
        *destPtr++ += *transBuffPtr++; *destPtr++ += *transBuffPtr++;
        *destPtr++ += *transBuffPtr++; *destPtr++ += *transBuffPtr++;
        *destPtr++ += *transBuffPtr++; *destPtr++ += *transBuffPtr++;
        *destPtr++ += *transBuffPtr++; *destPtr++ += *transBuffPtr++;
        *destPtr++ += *transBuffPtr++; *destPtr++ += *transBuffPtr++;
        *destPtr++ += *transBuffPtr++; *destPtr++ += *transBuffPtr++;
        *destPtr++ += *transBuffPtr++; *destPtr++ += *transBuffPtr++;
        *destPtr++ += *transBuffPtr++; *destPtr++ += *transBuffPtr++;
            }

            /* Save second half of short window */
      for (j = BLOCK_LEN_SHORT/16-1; j >= 0; --j)  {
        *destPtr++ = *transBuffPtr++;  *destPtr++ = *transBuffPtr++;
        *destPtr++ = *transBuffPtr++;  *destPtr++ = *transBuffPtr++;
        *destPtr++ = *transBuffPtr++;  *destPtr++ = *transBuffPtr++;
        *destPtr++ = *transBuffPtr++;  *destPtr++ = *transBuffPtr++;
        *destPtr++ = *transBuffPtr++;  *destPtr++ = *transBuffPtr++;
        *destPtr++ = *transBuffPtr++;  *destPtr++ = *transBuffPtr++;
        *destPtr++ = *transBuffPtr++;  *destPtr++ = *transBuffPtr++;
        *destPtr++ = *transBuffPtr++;  *destPtr++ = *transBuffPtr++;
            }
            destPtr -= BLOCK_LEN_SHORT;
        }
        /* Copy data to output buffer */
        destPtr = timeOutPtr;
        timeBuffPtr = timeBuff;     /*       [ch];      */

    for (i = BLOCK_LEN_LONG/16 - 1; i >= 0; --i)  {
      *destPtr++ = *timeBuffPtr++; *destPtr++ = *timeBuffPtr++;
      *destPtr++ = *timeBuffPtr++; *destPtr++ = *timeBuffPtr++;
      *destPtr++ = *timeBuffPtr++; *destPtr++ = *timeBuffPtr++;
      *destPtr++ = *timeBuffPtr++; *destPtr++ = *timeBuffPtr++;
      *destPtr++ = *timeBuffPtr++; *destPtr++ = *timeBuffPtr++;
      *destPtr++ = *timeBuffPtr++; *destPtr++ = *timeBuffPtr++;
      *destPtr++ = *timeBuffPtr++; *destPtr++ = *timeBuffPtr++;
      *destPtr++ = *timeBuffPtr++; *destPtr++ = *timeBuffPtr++;
        }
        /* Update timeBuff fifo */
        destPtr = timeBuff;     /*       [ch];      */
    for (i = BLOCK_LEN_LONG/16 - 1; i >= 0; --i)  {
      *destPtr++ = *timeBuffPtr++; *destPtr++ = *timeBuffPtr++;
      *destPtr++ = *timeBuffPtr++; *destPtr++ = *timeBuffPtr++;
      *destPtr++ = *timeBuffPtr++; *destPtr++ = *timeBuffPtr++;
      *destPtr++ = *timeBuffPtr++; *destPtr++ = *timeBuffPtr++;
      *destPtr++ = *timeBuffPtr++; *destPtr++ = *timeBuffPtr++;
      *destPtr++ = *timeBuffPtr++; *destPtr++ = *timeBuffPtr++;
      *destPtr++ = *timeBuffPtr++; *destPtr++ = *timeBuffPtr++;
      *destPtr++ = *timeBuffPtr++; *destPtr++ = *timeBuffPtr++;
     }
    }

    else if (blockType == START_TYPE)  {
        unfold(freqInPtr, transBuff, BLOCK_LEN_LONG);
        ITransformBlock (hDecoder, transBuff, START_FLAT_BLOCK, wnd_shape, timeBuff);
        /* Add first half and old data */
        transBuffPtr = transBuff;
        timeBuffPtr = timeBuff;
        destPtr = timeOutPtr;
    for (i = BLOCK_LEN_LONG/16 - 1; i >= 0; --i)  {
            *destPtr++ = *transBuffPtr++ + *timeBuffPtr++;
            *destPtr++ = *transBuffPtr++ + *timeBuffPtr++;
            *destPtr++ = *transBuffPtr++ + *timeBuffPtr++;
            *destPtr++ = *transBuffPtr++ + *timeBuffPtr++;
            *destPtr++ = *transBuffPtr++ + *timeBuffPtr++;
            *destPtr++ = *transBuffPtr++ + *timeBuffPtr++;
            *destPtr++ = *transBuffPtr++ + *timeBuffPtr++;