codec_g726.c - translate between signed linear and ITU G.726-32kbps (both RFC3551 and AAL2 codeword packing) More...
#include "asterisk.h"
#include "asterisk/lock.h"
#include "asterisk/linkedlists.h"
#include "asterisk/module.h"
#include "asterisk/config.h"
#include "asterisk/translate.h"
#include "asterisk/utils.h"
#include "log2comp.h"
#include "asterisk/slin.h"
#include "ex_g726.h"
Go to the source code of this file.
Data Structures | |
struct | g726_coder_pvt |
struct | g726_state |
Defines | |
#define | BUF_SHIFT 5 |
#define | BUFFER_SAMPLES 8096 |
#define | WANT_ASM |
Functions | |
static void | __reg_module (void) |
static void | __unreg_module (void) |
static int | fmult (int an, int srn) |
static int | g726_decode (int i, struct g726_state *state_ptr) |
static int | g726_encode (int sl, struct g726_state *state_ptr) |
static void | g726_init_state (struct g726_state *state_ptr) |
static int | g726aal2tolin_framein (struct ast_trans_pvt *pvt, struct ast_frame *f) |
decode packed 4-bit G726 values (AAL2 packing) and store in buffer. | |
static int | g726tolin_framein (struct ast_trans_pvt *pvt, struct ast_frame *f) |
decode packed 4-bit G726 values (RFC3551 packing) and store in buffer. | |
static int | lintog726_framein (struct ast_trans_pvt *pvt, struct ast_frame *f) |
compress and store data (4-bit G726 samples, RFC3551 packing) in outbuf | |
static int | lintog726_new (struct ast_trans_pvt *pvt) |
init a new instance of g726_coder_pvt. | |
static int | lintog726aal2_framein (struct ast_trans_pvt *pvt, struct ast_frame *f) |
compress and store data (4-bit G726 samples, AAL2 packing) in outbuf | |
static int | load_module (void) |
static int | predictor_pole (struct g726_state *state_ptr) |
static int | predictor_zero (struct g726_state *state_ptr) |
static int | quan (int val, int *table, int size) |
static int | quantize (int d, int y, int *table, int size) |
static int | reconstruct (int sign, int dqln, int y) |
static int | reload (void) |
static int | step_size (struct g726_state *state_ptr) |
static int | unload_module (void) |
static void | update (int code_size, int y, int wi, int fi, int dq, int sr, int dqsez, struct g726_state *state_ptr) |
Variables | |
static struct ast_module_info __MODULE_INFO_SECTION | __mod_info = { __MODULE_INFO_GLOBALS .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "ITU G.726-32kbps G726 Transcoder" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .reload = reload, } |
static int | _dqlntab [16] |
static int | _fitab [16] |
static int | _witab [16] |
static struct ast_module_info * | ast_module_info = &__mod_info |
static struct ast_translator | g726aal2tolin |
static struct ast_translator | g726tolin |
static struct ast_translator | lintog726 |
static struct ast_translator | lintog726aal2 |
static int | qtab_721 [7] = {-124, 80, 178, 246, 300, 349, 400} |
codec_g726.c - translate between signed linear and ITU G.726-32kbps (both RFC3551 and AAL2 codeword packing)
Definition in file codec_g726.c.
#define BUF_SHIFT 5 |
Definition at line 58 of file codec_g726.c.
#define BUFFER_SAMPLES 8096 |
Definition at line 57 of file codec_g726.c.
#define WANT_ASM |
Definition at line 41 of file codec_g726.c.
static void __reg_module | ( | void | ) | [static] |
Definition at line 860 of file codec_g726.c.
static void __unreg_module | ( | void | ) | [static] |
Definition at line 860 of file codec_g726.c.
static int fmult | ( | int | an, |
int | srn | ||
) | [static] |
Definition at line 203 of file codec_g726.c.
References ilog2().
Referenced by predictor_pole(), and predictor_zero().
{ int anmag, anexp, anmant; int wanexp, wanmant; int retval; anmag = (an > 0) ? an : ((-an) & 0x1FFF); anexp = ilog2(anmag) - 5; anmant = (anmag == 0) ? 32 : (anexp >= 0) ? anmag >> anexp : anmag << -anexp; wanexp = anexp + ((srn >> 6) & 0xF) - 13; wanmant = (anmant * (srn & 077) + 0x30) >> 4; retval = (wanexp >= 0) ? ((wanmant << wanexp) & 0x7FFF) : (wanmant >> -wanexp); return (((an ^ srn) < 0) ? -retval : retval); }
static int g726_decode | ( | int | i, |
struct g726_state * | state_ptr | ||
) | [static] |
Definition at line 576 of file codec_g726.c.
References predictor_pole(), predictor_zero(), reconstruct(), step_size(), and update().
Referenced by g726aal2tolin_framein(), and g726tolin_framein().
{ int sezi, sez, se; /* ACCUM */ int y; /* MIX */ int sr; /* ADDB */ int dq; int dqsez; i &= 0x0f; /* mask to get proper bits */ #ifdef NOT_BLI sezi = predictor_zero(state_ptr); sez = sezi; se = sezi + predictor_pole(state_ptr); /* estimated signal */ #else sezi = predictor_zero(state_ptr); sez = sezi >> 1; se = (sezi + predictor_pole(state_ptr)) >> 1; /* estimated signal */ #endif y = step_size(state_ptr); /* dynamic quantizer step size */ dq = reconstruct(i & 8, _dqlntab[i], y); /* quantized diff. */ #ifdef NOT_BLI sr = se + dq; /* reconst. signal */ dqsez = dq + sez; /* pole prediction diff. */ #else sr = (dq < 0) ? se - (dq & 0x3FFF) : se + dq; /* reconst. signal */ dqsez = sr - se + sez; /* pole prediction diff. */ #endif update(4, y, _witab[i] << 5, _fitab[i], dq, sr, dqsez, state_ptr); #ifdef NOT_BLI return (sr >> 10); /* sr was 26-bit dynamic range */ #else return (sr << 2); /* sr was 14-bit dynamic range */ #endif }
static int g726_encode | ( | int | sl, |
struct g726_state * | state_ptr | ||
) | [static] |
Definition at line 622 of file codec_g726.c.
References predictor_pole(), predictor_zero(), quantize(), reconstruct(), step_size(), and update().
Referenced by lintog726_framein(), and lintog726aal2_framein().
{ int sezi, se, sez; /* ACCUM */ int d; /* SUBTA */ int sr; /* ADDB */ int y; /* MIX */ int dqsez; /* ADDC */ int dq, i; #ifdef NOT_BLI sl <<= 10; /* 26-bit dynamic range */ sezi = predictor_zero(state_ptr); sez = sezi; se = sezi + predictor_pole(state_ptr); /* estimated signal */ #else sl >>= 2; /* 14-bit dynamic range */ sezi = predictor_zero(state_ptr); sez = sezi >> 1; se = (sezi + predictor_pole(state_ptr)) >> 1; /* estimated signal */ #endif d = sl - se; /* estimation difference */ /* quantize the prediction difference */ y = step_size(state_ptr); /* quantizer step size */ #ifdef NOT_BLI d /= 0x1000; #endif i = quantize(d, y, qtab_721, 7); /* i = G726 code */ dq = reconstruct(i & 8, _dqlntab[i], y); /* quantized est diff */ #ifdef NOT_BLI sr = se + dq; /* reconst. signal */ dqsez = dq + sez; /* pole prediction diff. */ #else sr = (dq < 0) ? se - (dq & 0x3FFF) : se + dq; /* reconst. signal */ dqsez = sr - se + sez; /* pole prediction diff. */ #endif update(4, y, _witab[i] << 5, _fitab[i], dq, sr, dqsez, state_ptr); return (i); }
static void g726_init_state | ( | struct g726_state * | state_ptr | ) | [static] |
Definition at line 121 of file codec_g726.c.
References g726_state::a, g726_state::ap, g726_state::b, g726_state::dml, g726_state::dms, g726_state::dq, g726_state::pk, g726_state::sr, g726_state::td, g726_state::yl, and g726_state::yu.
Referenced by lintog726_new().
{ int cnta; state_ptr->yl = 34816; state_ptr->yu = 544; state_ptr->dms = 0; state_ptr->dml = 0; state_ptr->ap = 0; for (cnta = 0; cnta < 2; cnta++) { state_ptr->a[cnta] = 0; state_ptr->pk[cnta] = 0; #ifdef NOT_BLI state_ptr->sr[cnta] = 1; #else state_ptr->sr[cnta] = 32; #endif } for (cnta = 0; cnta < 6; cnta++) { state_ptr->b[cnta] = 0; #ifdef NOT_BLI state_ptr->dq[cnta] = 1; #else state_ptr->dq[cnta] = 32; #endif } state_ptr->td = 0; }
static int g726aal2tolin_framein | ( | struct ast_trans_pvt * | pvt, |
struct ast_frame * | f | ||
) | [static] |
decode packed 4-bit G726 values (AAL2 packing) and store in buffer.
Definition at line 691 of file codec_g726.c.
References ast_frame::data, ast_trans_pvt::datalen, ast_frame::datalen, g726_coder_pvt::g726, g726_decode(), ast_trans_pvt::i16, ast_trans_pvt::outbuf, ast_frame::ptr, ast_trans_pvt::pvt, ast_frame::samples, and ast_trans_pvt::samples.
{ struct g726_coder_pvt *tmp = pvt->pvt; unsigned char *src = f->data.ptr; int16_t *dst = pvt->outbuf.i16 + pvt->samples; unsigned int i; for (i = 0; i < f->datalen; i++) { *dst++ = g726_decode((src[i] >> 4) & 0xf, &tmp->g726); *dst++ = g726_decode(src[i] & 0x0f, &tmp->g726); } pvt->samples += f->samples; pvt->datalen += 2 * f->samples; /* 2 bytes/sample */ return 0; }
static int g726tolin_framein | ( | struct ast_trans_pvt * | pvt, |
struct ast_frame * | f | ||
) | [static] |
decode packed 4-bit G726 values (RFC3551 packing) and store in buffer.
Definition at line 732 of file codec_g726.c.
References ast_frame::data, ast_trans_pvt::datalen, ast_frame::datalen, g726_coder_pvt::g726, g726_decode(), ast_trans_pvt::i16, ast_trans_pvt::outbuf, ast_frame::ptr, ast_trans_pvt::pvt, ast_frame::samples, and ast_trans_pvt::samples.
{ struct g726_coder_pvt *tmp = pvt->pvt; unsigned char *src = f->data.ptr; int16_t *dst = pvt->outbuf.i16 + pvt->samples; unsigned int i; for (i = 0; i < f->datalen; i++) { *dst++ = g726_decode(src[i] & 0x0f, &tmp->g726); *dst++ = g726_decode((src[i] >> 4) & 0xf, &tmp->g726); } pvt->samples += f->samples; pvt->datalen += 2 * f->samples; /* 2 bytes/sample */ return 0; }
static int lintog726_framein | ( | struct ast_trans_pvt * | pvt, |
struct ast_frame * | f | ||
) | [static] |
compress and store data (4-bit G726 samples, RFC3551 packing) in outbuf
Definition at line 751 of file codec_g726.c.
References ast_trans_pvt::c, ast_frame::data, ast_trans_pvt::datalen, g726_coder_pvt::g726, g726_encode(), g726_coder_pvt::next_flag, ast_trans_pvt::outbuf, ast_frame::ptr, ast_trans_pvt::pvt, ast_trans_pvt::samples, and ast_frame::samples.
{ struct g726_coder_pvt *tmp = pvt->pvt; int16_t *src = f->data.ptr; unsigned int i; for (i = 0; i < f->samples; i++) { unsigned char d = g726_encode(src[i], &tmp->g726); /* this sample */ if (tmp->next_flag & 0x80) { /* merge with leftover sample */ pvt->outbuf.c[pvt->datalen++] = (d << 4) | (tmp->next_flag & 0xf); pvt->samples += 2; /* 2 samples per byte */ tmp->next_flag = 0; } else { tmp->next_flag = 0x80 | d; } } return 0; }
static int lintog726_new | ( | struct ast_trans_pvt * | pvt | ) | [static] |
init a new instance of g726_coder_pvt.
Definition at line 681 of file codec_g726.c.
References g726_coder_pvt::g726, g726_init_state(), and ast_trans_pvt::pvt.
{ struct g726_coder_pvt *tmp = pvt->pvt; g726_init_state(&tmp->g726); return 0; }
static int lintog726aal2_framein | ( | struct ast_trans_pvt * | pvt, |
struct ast_frame * | f | ||
) | [static] |
compress and store data (4-bit G726 samples, AAL2 packing) in outbuf
Definition at line 710 of file codec_g726.c.
References ast_trans_pvt::c, ast_frame::data, ast_trans_pvt::datalen, g726_coder_pvt::g726, g726_encode(), g726_coder_pvt::next_flag, ast_trans_pvt::outbuf, ast_frame::ptr, ast_trans_pvt::pvt, ast_trans_pvt::samples, and ast_frame::samples.
{ struct g726_coder_pvt *tmp = pvt->pvt; int16_t *src = f->data.ptr; unsigned int i; for (i = 0; i < f->samples; i++) { unsigned char d = g726_encode(src[i], &tmp->g726); /* this sample */ if (tmp->next_flag & 0x80) { /* merge with leftover sample */ pvt->outbuf.c[pvt->datalen++] = ((tmp->next_flag & 0xf)<< 4) | d; pvt->samples += 2; /* 2 samples per byte */ tmp->next_flag = 0; } else { tmp->next_flag = 0x80 | d; } } return 0; }
static int load_module | ( | void | ) | [static] |
Definition at line 838 of file codec_g726.c.
References AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_SUCCESS, ast_register_translator, and unload_module().
{ int res = 0; res |= ast_register_translator(&g726tolin); res |= ast_register_translator(&lintog726); res |= ast_register_translator(&g726aal2tolin); res |= ast_register_translator(&lintog726aal2); if (res) { unload_module(); return AST_MODULE_LOAD_FAILURE; } return AST_MODULE_LOAD_SUCCESS; }
static int predictor_pole | ( | struct g726_state * | state_ptr | ) | [static] |
Definition at line 231 of file codec_g726.c.
References g726_state::a, fmult(), and g726_state::sr.
Referenced by g726_decode(), and g726_encode().
static int predictor_zero | ( | struct g726_state * | state_ptr | ) | [static] |
Definition at line 222 of file codec_g726.c.
References g726_state::b, g726_state::dq, and fmult().
Referenced by g726_decode(), and g726_encode().
static int quan | ( | int | val, |
int * | table, | ||
int | size | ||
) | [static] |
static int quantize | ( | int | d, |
int | y, | ||
int * | table, | ||
int | size | ||
) | [static] |
Definition at line 274 of file codec_g726.c.
References ilog2(), and quan().
Referenced by g726_encode().
{ int dqm; /* Magnitude of 'd' */ int exp; /* Integer part of base 2 log of 'd' */ int mant; /* Fractional part of base 2 log */ int dl; /* Log of magnitude of 'd' */ int dln; /* Step size scale factor normalized log */ int i; /* * LOG * * Compute base 2 log of 'd', and store in 'dl'. */ dqm = abs(d); exp = ilog2(dqm); if (exp < 0) exp = 0; mant = ((dqm << 7) >> exp) & 0x7F; /* Fractional portion. */ dl = (exp << 7) | mant; /* * SUBTB * * "Divide" by step size multiplier. */ dln = dl - (y >> 2); /* * QUAN * * Obtain codword i for 'd'. */ i = quan(dln, table, size); if (d < 0) /* take 1's complement of i */ return ((size << 1) + 1 - i); else if (i == 0) /* take 1's complement of 0 */ return ((size << 1) + 1); /* new in 1988 */ else return (i); }
static int reconstruct | ( | int | sign, |
int | dqln, | ||
int | y | ||
) | [static] |
Definition at line 327 of file codec_g726.c.
Referenced by bridge_p2p_rtp_write(), g726_decode(), and g726_encode().
{ int dql; /* Log of 'dq' magnitude */ int dex; /* Integer part of log */ int dqt; int dq; /* Reconstructed difference signal sample */ dql = dqln + (y >> 2); /* ADDA */ if (dql < 0) { #ifdef NOT_BLI return (sign) ? -1 : 1; #else return (sign) ? -0x8000 : 0; #endif } else { /* ANTILOG */ dex = (dql >> 7) & 15; dqt = 128 + (dql & 127); #ifdef NOT_BLI dq = ((dqt << 19) >> (14 - dex)); return (sign) ? -dq : dq; #else dq = (dqt << 7) >> (14 - dex); return (sign) ? (dq - 0x8000) : dq; #endif } }
static int reload | ( | void | ) | [static] |
Definition at line 820 of file codec_g726.c.
References AST_MODULE_LOAD_SUCCESS.
{ return AST_MODULE_LOAD_SUCCESS; }
static int step_size | ( | struct g726_state * | state_ptr | ) | [static] |
Definition at line 245 of file codec_g726.c.
References g726_state::ap, g726_state::yl, and g726_state::yu.
Referenced by g726_decode(), and g726_encode().
static int unload_module | ( | void | ) | [static] |
Definition at line 825 of file codec_g726.c.
References ast_unregister_translator().
Referenced by load_module().
{ int res = 0; res |= ast_unregister_translator(&g726tolin); res |= ast_unregister_translator(&lintog726); res |= ast_unregister_translator(&g726aal2tolin); res |= ast_unregister_translator(&lintog726aal2); return res; }
static void update | ( | int | code_size, |
int | y, | ||
int | wi, | ||
int | fi, | ||
int | dq, | ||
int | sr, | ||
int | dqsez, | ||
struct g726_state * | state_ptr | ||
) | [static] |
Definition at line 363 of file codec_g726.c.
References g726_state::a, g726_state::ap, g726_state::b, g726_state::dml, g726_state::dms, g726_state::dq, ilog2(), g726_state::pk, g726_state::sr, g726_state::td, g726_state::yl, and g726_state::yu.
Referenced by config_device(), config_line(), g726_decode(), and g726_encode().
{ int cnt; int mag; /* Adaptive predictor, FLOAT A */ #ifndef NOT_BLI int exp; #endif int a2p=0; /* LIMC */ int a1ul; /* UPA1 */ int pks1; /* UPA2 */ int fa1; int tr; /* tone/transition detector */ int ylint, thr2, dqthr; int ylfrac, thr1; int pk0; pk0 = (dqsez < 0) ? 1 : 0; /* needed in updating predictor poles */ #ifdef NOT_BLI mag = abs(dq / 0x1000); /* prediction difference magnitude */ #else mag = dq & 0x7FFF; /* prediction difference magnitude */ #endif /* TRANS */ ylint = state_ptr->yl >> 15; /* exponent part of yl */ ylfrac = (state_ptr->yl >> 10) & 0x1F; /* fractional part of yl */ thr1 = (32 + ylfrac) << ylint; /* threshold */ thr2 = (ylint > 9) ? 31 << 10 : thr1; /* limit thr2 to 31 << 10 */ dqthr = (thr2 + (thr2 >> 1)) >> 1; /* dqthr = 0.75 * thr2 */ if (state_ptr->td == 0) /* signal supposed voice */ tr = 0; else if (mag <= dqthr) /* supposed data, but small mag */ tr = 0; /* treated as voice */ else /* signal is data (modem) */ tr = 1; /* * Quantizer scale factor adaptation. */ /* FUNCTW & FILTD & DELAY */ /* update non-steady state step size multiplier */ state_ptr->yu = y + ((wi - y) >> 5); /* LIMB */ if (state_ptr->yu < 544) /* 544 <= yu <= 5120 */ state_ptr->yu = 544; else if (state_ptr->yu > 5120) state_ptr->yu = 5120; /* FILTE & DELAY */ /* update steady state step size multiplier */ state_ptr->yl += state_ptr->yu + ((-state_ptr->yl) >> 6); /* * Adaptive predictor coefficients. */ if (tr == 1) { /* reset a's and b's for modem signal */ state_ptr->a[0] = 0; state_ptr->a[1] = 0; state_ptr->b[0] = 0; state_ptr->b[1] = 0; state_ptr->b[2] = 0; state_ptr->b[3] = 0; state_ptr->b[4] = 0; state_ptr->b[5] = 0; } else { /* update a's and b's */ pks1 = pk0 ^ state_ptr->pk[0]; /* UPA2 */ /* update predictor pole a[1] */ a2p = state_ptr->a[1] - (state_ptr->a[1] >> 7); if (dqsez != 0) { fa1 = (pks1) ? state_ptr->a[0] : -state_ptr->a[0]; if (fa1 < -8191) /* a2p = function of fa1 */ a2p -= 0x100; else if (fa1 > 8191) a2p += 0xFF; else a2p += fa1 >> 5; if (pk0 ^ state_ptr->pk[1]) /* LIMC */ if (a2p <= -12160) a2p = -12288; else if (a2p >= 12416) a2p = 12288; else a2p -= 0x80; else if (a2p <= -12416) a2p = -12288; else if (a2p >= 12160) a2p = 12288; else a2p += 0x80; } /* TRIGB & DELAY */ state_ptr->a[1] = a2p; /* UPA1 */ /* update predictor pole a[0] */ state_ptr->a[0] -= state_ptr->a[0] >> 8; if (dqsez != 0) { if (pks1 == 0) state_ptr->a[0] += 192; else state_ptr->a[0] -= 192; } /* LIMD */ a1ul = 15360 - a2p; if (state_ptr->a[0] < -a1ul) state_ptr->a[0] = -a1ul; else if (state_ptr->a[0] > a1ul) state_ptr->a[0] = a1ul; /* UPB : update predictor zeros b[6] */ for (cnt = 0; cnt < 6; cnt++) { if (code_size == 5) /* for 40Kbps G.723 */ state_ptr->b[cnt] -= state_ptr->b[cnt] >> 9; else /* for G.721 and 24Kbps G.723 */ state_ptr->b[cnt] -= state_ptr->b[cnt] >> 8; if (mag) { /* XOR */ if ((dq ^ state_ptr->dq[cnt]) >= 0) state_ptr->b[cnt] += 128; else state_ptr->b[cnt] -= 128; } } } for (cnt = 5; cnt > 0; cnt--) state_ptr->dq[cnt] = state_ptr->dq[cnt-1]; #ifdef NOT_BLI state_ptr->dq[0] = dq; #else /* FLOAT A : convert dq[0] to 4-bit exp, 6-bit mantissa f.p. */ if (mag == 0) { state_ptr->dq[0] = (dq >= 0) ? 0x20 : 0x20 - 0x400; } else { exp = ilog2(mag) + 1; state_ptr->dq[0] = (dq >= 0) ? (exp << 6) + ((mag << 6) >> exp) : (exp << 6) + ((mag << 6) >> exp) - 0x400; } #endif state_ptr->sr[1] = state_ptr->sr[0]; #ifdef NOT_BLI state_ptr->sr[0] = sr; #else /* FLOAT B : convert sr to 4-bit exp., 6-bit mantissa f.p. */ if (sr == 0) { state_ptr->sr[0] = 0x20; } else if (sr > 0) { exp = ilog2(sr) + 1; state_ptr->sr[0] = (exp << 6) + ((sr << 6) >> exp); } else if (sr > -0x8000) { mag = -sr; exp = ilog2(mag) + 1; state_ptr->sr[0] = (exp << 6) + ((mag << 6) >> exp) - 0x400; } else state_ptr->sr[0] = 0x20 - 0x400; #endif /* DELAY A */ state_ptr->pk[1] = state_ptr->pk[0]; state_ptr->pk[0] = pk0; /* TONE */ if (tr == 1) /* this sample has been treated as data */ state_ptr->td = 0; /* next one will be treated as voice */ else if (a2p < -11776) /* small sample-to-sample correlation */ state_ptr->td = 1; /* signal may be data */ else /* signal is voice */ state_ptr->td = 0; /* * Adaptation speed control. */ state_ptr->dms += (fi - state_ptr->dms) >> 5; /* FILTA */ state_ptr->dml += (((fi << 2) - state_ptr->dml) >> 7); /* FILTB */ if (tr == 1) state_ptr->ap = 256; else if (y < 1536) /* SUBTC */ state_ptr->ap += (0x200 - state_ptr->ap) >> 4; else if (state_ptr->td == 1) state_ptr->ap += (0x200 - state_ptr->ap) >> 4; else if (abs((state_ptr->dms << 2) - state_ptr->dml) >= (state_ptr->dml >> 3)) state_ptr->ap += (0x200 - state_ptr->ap) >> 4; else state_ptr->ap += (-state_ptr->ap) >> 4; }
struct ast_module_info __MODULE_INFO_SECTION __mod_info = { __MODULE_INFO_GLOBALS .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "ITU G.726-32kbps G726 Transcoder" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .reload = reload, } [static] |
Definition at line 860 of file codec_g726.c.
int _dqlntab[16] [static] |
{-2048, 4, 135, 213, 273, 323, 373, 425, 425, 373, 323, 273, 213, 135, 4, -2048}
Definition at line 99 of file codec_g726.c.
int _fitab[16] [static] |
{0, 0, 0, 0x200, 0x200, 0x200, 0x600, 0xE00, 0xE00, 0x600, 0x200, 0x200, 0x200, 0, 0, 0}
Definition at line 110 of file codec_g726.c.
int _witab[16] [static] |
{-12, 18, 41, 64, 112, 198, 355, 1122, 1122, 355, 198, 112, 64, 41, 18, -12}
Definition at line 103 of file codec_g726.c.
struct ast_module_info* ast_module_info = &__mod_info [static] |
Definition at line 860 of file codec_g726.c.
struct ast_translator g726aal2tolin [static] |
Definition at line 796 of file codec_g726.c.
struct ast_translator g726tolin [static] |
Definition at line 772 of file codec_g726.c.
struct ast_translator lintog726 [static] |
Definition at line 784 of file codec_g726.c.
struct ast_translator lintog726aal2 [static] |
Definition at line 808 of file codec_g726.c.
int qtab_721[7] = {-124, 80, 178, 246, 300, 349, 400} [static] |
Definition at line 94 of file codec_g726.c.