decdata.c

网络MPEG4IP流媒体开发源代码

/************************* MPEG-2 NBC Audio Decoder **************************
 *                                                                           *
"This software module was originally developed by
AT&T, Dolby Laboratories, Fraunhofer Gesellschaft IIS and edited by
Yoshiaki Oikawa (Sony Corporation)
,Mitsuyuki Hatanaka (Sony Corporation),
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.
 *                                                                           *
 ****************************************************************************/

#include "all.h"

Hcb book[NSPECBOOKS+2];
int sfbwidth128[(1<<LEN_MAX_SFBS)];

const int SampleRates[] = {
    96000,88200,64000,48000,44100,32000,24000,22050,16000,12000,11025,8000,7350,0,0,0
};

/* Returns the sample rate index */
int get_sr_index(unsigned int sampleRate)
{
    if (92017 <= sampleRate) return 0;
    if (75132 <= sampleRate) return 1;
    if (55426 <= sampleRate) return 2;
    if (46009 <= sampleRate) return 3;
    if (37566 <= sampleRate) return 4;
    if (27713 <= sampleRate) return 5;
    if (23004 <= sampleRate) return 6;
    if (18783 <= sampleRate) return 7;
    if (13856 <= sampleRate) return 8;
    if (11502 <= sampleRate) return 9;
    if (9391 <= sampleRate) return 10;

    return 11;
}
static int sfb_96_1024[] =
{
  4, 8, 12, 16, 20, 24, 28,
  32, 36, 40, 44, 48, 52, 56,
  64, 72, 80, 88, 96, 108, 120,
  132, 144, 156, 172, 188, 212, 240,
  276, 320, 384, 448, 512, 576, 640,
  704, 768, 832, 896, 960, 1024
};   /* 41 scfbands */

static int sfb_96_128[] =
{
  4, 8, 12, 16, 20, 24, 32,
  40, 48, 64, 92, 128
};   /* 12 scfbands */

static int sfb_64_1024[] =
{
  4, 8, 12, 16, 20, 24, 28,
  32, 36, 40, 44, 48, 52, 56,
  64, 72, 80, 88, 100, 112, 124,
  140, 156, 172, 192, 216, 240, 268,
  304, 344, 384, 424, 464, 504, 544,
  584, 624, 664, 704, 744, 784, 824,
  864, 904, 944, 984, 1024
};   /* 41 scfbands 47 */

static int sfb_64_128[] =
{
  4, 8, 12, 16, 20, 24, 32,
  40, 48, 64, 92, 128
};   /* 12 scfbands */


static int sfb_48_1024[] =
{
  4, 8, 12, 16, 20, 24, 28,
  32,   36, 40, 48, 56, 64, 72,
  80,   88, 96, 108,    120,    132,    144,
  160,  176,    196,    216,    240,    264,    292,
  320,  352,    384,    416,    448,    480,    512,
  544,  576,    608,    640,    672,    704,    736,
  768,  800,    832,    864,    896,    928,    1024
};

static int sfb_48_128[] =
{
          4,    8,  12, 16, 20, 28, 36,
          44,   56, 68, 80, 96, 112,    128
};

static int sfb_32_1024[] =
{
        4,  8,  12, 16, 20, 24, 28,
        32, 36, 40, 48, 56, 64, 72,
        80, 88, 96, 108,    120,    132,    144,
        160,    176,    196,    216,    240,    264,    292,
        320,    352,    384,    416,    448,    480,    512,
        544,    576,    608,    640,    672,    704,    736,
        768,    800,    832,    864,    896,    928,    960,
        992,    1024
};

static int sfb_24_1024[] =
{
  4, 8, 12, 16, 20, 24, 28,
  32, 36, 40, 44, 52, 60, 68,
  76, 84, 92, 100, 108, 116, 124,
  136, 148, 160, 172, 188, 204, 220,
  240, 260, 284, 308, 336, 364, 396,
  432, 468, 508, 552, 600, 652, 704,
  768, 832, 896, 960, 1024
};   /* 47 scfbands */

static int sfb_24_128[] =
{
  4, 8, 12, 16, 20, 24, 28,
  36, 44, 52, 64, 76, 92, 108,
  128
};   /* 15 scfbands */

static int sfb_16_1024[] =
{
  8, 16, 24, 32, 40, 48, 56,
  64, 72, 80, 88, 100, 112, 124,
  136, 148, 160, 172, 184, 196, 212,
  228, 244, 260, 280, 300, 320, 344,
  368, 396, 424, 456, 492, 532, 572,
  616, 664, 716, 772, 832, 896, 960,
  1024
};   /* 43 scfbands */

static int sfb_16_128[] =
{
  4, 8, 12, 16, 20, 24, 28,
  32, 40, 48, 60, 72, 88, 108,
  128
};   /* 15 scfbands */

static int sfb_8_1024[] =
{
  12, 24, 36, 48, 60, 72, 84,
  96, 108, 120, 132, 144, 156, 172,
  188, 204, 220, 236, 252, 268, 288,
  308, 328, 348, 372, 396, 420, 448,
  476, 508, 544, 580, 620, 664, 712,
  764, 820, 880, 944, 1024
};   /* 40 scfbands */

static int sfb_8_128[] =
{
  4, 8, 12, 16, 20, 24, 28,
  36, 44, 52, 60, 72, 88, 108,
  128
};   /* 15 scfbands */

SR_Info samp_rate_info[(1<<LEN_SAMP_IDX)] =
{
    /* sampling_frequency, #long sfb, long sfb, #short sfb, short sfb */
    /* samp_rate, nsfb1024, SFbands1024, nsfb128, SFbands128 */
    {96000, 41, sfb_96_1024, 12, sfb_96_128},       /* 96000 */
    {88200, 41, sfb_96_1024, 12, sfb_96_128},       /* 88200 */
    {64000, 47, sfb_64_1024, 12, sfb_64_128},       /* 64000 */
    {48000, 49, sfb_48_1024, 14, sfb_48_128},       /* 48000 */
    {44100, 49, sfb_48_1024, 14, sfb_48_128},       /* 44100 */
    {32000, 51, sfb_32_1024, 14, sfb_48_128},       /* 32000 */
    {24000, 47, sfb_24_1024, 15, sfb_24_128},       /* 24000 */
    {22050, 47, sfb_24_1024, 15, sfb_24_128},       /* 22050 */
    {16000, 43, sfb_16_1024, 15, sfb_16_128},       /* 16000 */
    {12000, 43, sfb_16_1024, 15, sfb_16_128},       /* 12000 */
    {11025, 43, sfb_16_1024, 15, sfb_16_128},       /* 11025 */
    {8000,  40, sfb_8_1024,  15, sfb_8_128 },       /* 8000  */
    {0,0,0,0,0},
    {0,0,0,0,0},
    {0,0,0,0,0},
    {0,0,0,0,0}
};

int tns_max_bands_tbl[(1<<LEN_SAMP_IDX)][4] =
{
    /* entry for each sampling rate
     * 1    Main/LC long window
     * 2    Main/LC short window
     * 3    SSR long window
     * 4    SSR short window
     */
    {31,  9, 28,  7},       /* 96000 */
    {31,  9, 28,  7},       /* 88200 */
    {34, 10, 27,  7},       /* 64000 */
    {40, 14, 26,  6},       /* 48000 */
    {42, 14, 26,  6},       /* 44100 */
    {51, 14, 26,  6},       /* 32000 */
    {46, 14, 29,  7},       /* 24000 */
    {46, 14, 29,  7},       /* 22050 */
    {42, 14, 23,  8},       /* 16000 */
    {42, 14, 23,  8},       /* 12000 */
    {42, 14, 23,  8},       /* 11025 */
    {39, 14, 19,  7},       /* 8000  */
    {0,0,0,0},
    {0,0,0,0},
    {0,0,0,0},
    {0,0,0,0}
};

int pred_max_bands_tbl[(1<<LEN_SAMP_IDX)] = {
  33,     /* 96000 */
  33,     /* 88200 */
  38,     /* 64000 */
  40,     /* 48000 */
  40,     /* 44100 */
  40,     /* 32000 */
  41,     /* 24000 */
  41,     /* 22050 */
  37,     /* 16000 */
  37,     /* 12000 */
  37,     /* 11025 */
  34,     /* 8000  */
  0,
  0,
  0,
  0
};