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-rw-r--r--trunk/codecs/g722/g722_decode.c398
1 files changed, 398 insertions, 0 deletions
diff --git a/trunk/codecs/g722/g722_decode.c b/trunk/codecs/g722/g722_decode.c
new file mode 100644
index 000000000..1625acc86
--- /dev/null
+++ b/trunk/codecs/g722/g722_decode.c
@@ -0,0 +1,398 @@
+/*
+ * SpanDSP - a series of DSP components for telephony
+ *
+ * g722_decode.c - The ITU G.722 codec, decode part.
+ *
+ * Written by Steve Underwood <steveu@coppice.org>
+ *
+ * Copyright (C) 2005 Steve Underwood
+ *
+ * Despite my general liking of the GPL, I place my own contributions
+ * to this code in the public domain for the benefit of all mankind -
+ * even the slimy ones who might try to proprietize my work and use it
+ * to my detriment.
+ *
+ * Based in part on a single channel G.722 codec which is:
+ *
+ * Copyright (c) CMU 1993
+ * Computer Science, Speech Group
+ * Chengxiang Lu and Alex Hauptmann
+ *
+ * $Id$
+ */
+
+/*! \file */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <inttypes.h>
+#include <memory.h>
+#include <stdlib.h>
+#if 0
+#include <tgmath.h>
+#endif
+
+#include "g722.h"
+
+#if !defined(FALSE)
+#define FALSE 0
+#endif
+#if !defined(TRUE)
+#define TRUE (!FALSE)
+#endif
+
+static __inline__ int16_t saturate(int32_t amp)
+{
+ int16_t amp16;
+
+ /* Hopefully this is optimised for the common case - not clipping */
+ amp16 = (int16_t) amp;
+ if (amp == amp16)
+ return amp16;
+ if (amp > INT16_MAX)
+ return INT16_MAX;
+ return INT16_MIN;
+}
+/*- End of function --------------------------------------------------------*/
+
+static void block4(g722_decode_state_t *s, int band, int d);
+
+static void block4(g722_decode_state_t *s, int band, int d)
+{
+ int wd1;
+ int wd2;
+ int wd3;
+ int i;
+
+ /* Block 4, RECONS */
+ s->band[band].d[0] = d;
+ s->band[band].r[0] = saturate(s->band[band].s + d);
+
+ /* Block 4, PARREC */
+ s->band[band].p[0] = saturate(s->band[band].sz + d);
+
+ /* Block 4, UPPOL2 */
+ for (i = 0; i < 3; i++)
+ s->band[band].sg[i] = s->band[band].p[i] >> 15;
+ wd1 = saturate(s->band[band].a[1] << 2);
+
+ wd2 = (s->band[band].sg[0] == s->band[band].sg[1]) ? -wd1 : wd1;
+ if (wd2 > 32767)
+ wd2 = 32767;
+ wd3 = (s->band[band].sg[0] == s->band[band].sg[2]) ? 128 : -128;
+ wd3 += (wd2 >> 7);
+ wd3 += (s->band[band].a[2]*32512) >> 15;
+ if (wd3 > 12288)
+ wd3 = 12288;
+ else if (wd3 < -12288)
+ wd3 = -12288;
+ s->band[band].ap[2] = wd3;
+
+ /* Block 4, UPPOL1 */
+ s->band[band].sg[0] = s->band[band].p[0] >> 15;
+ s->band[band].sg[1] = s->band[band].p[1] >> 15;
+ wd1 = (s->band[band].sg[0] == s->band[band].sg[1]) ? 192 : -192;
+ wd2 = (s->band[band].a[1]*32640) >> 15;
+
+ s->band[band].ap[1] = saturate(wd1 + wd2);
+ wd3 = saturate(15360 - s->band[band].ap[2]);
+ if (s->band[band].ap[1] > wd3)
+ s->band[band].ap[1] = wd3;
+ else if (s->band[band].ap[1] < -wd3)
+ s->band[band].ap[1] = -wd3;
+
+ /* Block 4, UPZERO */
+ wd1 = (d == 0) ? 0 : 128;
+ s->band[band].sg[0] = d >> 15;
+ for (i = 1; i < 7; i++)
+ {
+ s->band[band].sg[i] = s->band[band].d[i] >> 15;
+ wd2 = (s->band[band].sg[i] == s->band[band].sg[0]) ? wd1 : -wd1;
+ wd3 = (s->band[band].b[i]*32640) >> 15;
+ s->band[band].bp[i] = saturate(wd2 + wd3);
+ }
+
+ /* Block 4, DELAYA */
+ for (i = 6; i > 0; i--)
+ {
+ s->band[band].d[i] = s->band[band].d[i - 1];
+ s->band[band].b[i] = s->band[band].bp[i];
+ }
+
+ for (i = 2; i > 0; i--)
+ {
+ s->band[band].r[i] = s->band[band].r[i - 1];
+ s->band[band].p[i] = s->band[band].p[i - 1];
+ s->band[band].a[i] = s->band[band].ap[i];
+ }
+
+ /* Block 4, FILTEP */
+ wd1 = saturate(s->band[band].r[1] + s->band[band].r[1]);
+ wd1 = (s->band[band].a[1]*wd1) >> 15;
+ wd2 = saturate(s->band[band].r[2] + s->band[band].r[2]);
+ wd2 = (s->band[band].a[2]*wd2) >> 15;
+ s->band[band].sp = saturate(wd1 + wd2);
+
+ /* Block 4, FILTEZ */
+ s->band[band].sz = 0;
+ for (i = 6; i > 0; i--)
+ {
+ wd1 = saturate(s->band[band].d[i] + s->band[band].d[i]);
+ s->band[band].sz += (s->band[band].b[i]*wd1) >> 15;
+ }
+ s->band[band].sz = saturate(s->band[band].sz);
+
+ /* Block 4, PREDIC */
+ s->band[band].s = saturate(s->band[band].sp + s->band[band].sz);
+}
+/*- End of function --------------------------------------------------------*/
+
+g722_decode_state_t *g722_decode_init(g722_decode_state_t *s, int rate, int options)
+{
+ if (s == NULL)
+ {
+ if ((s = (g722_decode_state_t *) malloc(sizeof(*s))) == NULL)
+ return NULL;
+ }
+ memset(s, 0, sizeof(*s));
+ if (rate == 48000)
+ s->bits_per_sample = 6;
+ else if (rate == 56000)
+ s->bits_per_sample = 7;
+ else
+ s->bits_per_sample = 8;
+ if ((options & G722_SAMPLE_RATE_8000))
+ s->eight_k = TRUE;
+ if ((options & G722_PACKED) && s->bits_per_sample != 8)
+ s->packed = TRUE;
+ else
+ s->packed = FALSE;
+ s->band[0].det = 32;
+ s->band[1].det = 8;
+ return s;
+}
+/*- End of function --------------------------------------------------------*/
+
+int g722_decode_release(g722_decode_state_t *s)
+{
+ free(s);
+ return 0;
+}
+/*- End of function --------------------------------------------------------*/
+
+int g722_decode(g722_decode_state_t *s, int16_t amp[], const uint8_t g722_data[], int len)
+{
+ static const int wl[8] = {-60, -30, 58, 172, 334, 538, 1198, 3042 };
+ static const int rl42[16] = {0, 7, 6, 5, 4, 3, 2, 1, 7, 6, 5, 4, 3, 2, 1, 0 };
+ static const int ilb[32] =
+ {
+ 2048, 2093, 2139, 2186, 2233, 2282, 2332,
+ 2383, 2435, 2489, 2543, 2599, 2656, 2714,
+ 2774, 2834, 2896, 2960, 3025, 3091, 3158,
+ 3228, 3298, 3371, 3444, 3520, 3597, 3676,
+ 3756, 3838, 3922, 4008
+ };
+ static const int wh[3] = {0, -214, 798};
+ static const int rh2[4] = {2, 1, 2, 1};
+ static const int qm2[4] = {-7408, -1616, 7408, 1616};
+ static const int qm4[16] =
+ {
+ 0, -20456, -12896, -8968,
+ -6288, -4240, -2584, -1200,
+ 20456, 12896, 8968, 6288,
+ 4240, 2584, 1200, 0
+ };
+ static const int qm5[32] =
+ {
+ -280, -280, -23352, -17560,
+ -14120, -11664, -9752, -8184,
+ -6864, -5712, -4696, -3784,
+ -2960, -2208, -1520, -880,
+ 23352, 17560, 14120, 11664,
+ 9752, 8184, 6864, 5712,
+ 4696, 3784, 2960, 2208,
+ 1520, 880, 280, -280
+ };
+ static const int qm6[64] =
+ {
+ -136, -136, -136, -136,
+ -24808, -21904, -19008, -16704,
+ -14984, -13512, -12280, -11192,
+ -10232, -9360, -8576, -7856,
+ -7192, -6576, -6000, -5456,
+ -4944, -4464, -4008, -3576,
+ -3168, -2776, -2400, -2032,
+ -1688, -1360, -1040, -728,
+ 24808, 21904, 19008, 16704,
+ 14984, 13512, 12280, 11192,
+ 10232, 9360, 8576, 7856,
+ 7192, 6576, 6000, 5456,
+ 4944, 4464, 4008, 3576,
+ 3168, 2776, 2400, 2032,
+ 1688, 1360, 1040, 728,
+ 432, 136, -432, -136
+ };
+ static const int qmf_coeffs[12] =
+ {
+ 3, -11, 12, 32, -210, 951, 3876, -805, 362, -156, 53, -11,
+ };
+
+ int dlowt;
+ int rlow;
+ int ihigh;
+ int dhigh;
+ int rhigh;
+ int xout1;
+ int xout2;
+ int wd1;
+ int wd2;
+ int wd3;
+ int code;
+ int outlen;
+ int i;
+ int j;
+
+ outlen = 0;
+ rhigh = 0;
+ for (j = 0; j < len; )
+ {
+ if (s->packed)
+ {
+ /* Unpack the code bits */
+ if (s->in_bits < s->bits_per_sample)
+ {
+ s->in_buffer |= (g722_data[j++] << s->in_bits);
+ s->in_bits += 8;
+ }
+ code = s->in_buffer & ((1 << s->bits_per_sample) - 1);
+ s->in_buffer >>= s->bits_per_sample;
+ s->in_bits -= s->bits_per_sample;
+ }
+ else
+ {
+ code = g722_data[j++];
+ }
+
+ switch (s->bits_per_sample)
+ {
+ default:
+ case 8:
+ wd1 = code & 0x3F;
+ ihigh = (code >> 6) & 0x03;
+ wd2 = qm6[wd1];
+ wd1 >>= 2;
+ break;
+ case 7:
+ wd1 = code & 0x1F;
+ ihigh = (code >> 5) & 0x03;
+ wd2 = qm5[wd1];
+ wd1 >>= 1;
+ break;
+ case 6:
+ wd1 = code & 0x0F;
+ ihigh = (code >> 4) & 0x03;
+ wd2 = qm4[wd1];
+ break;
+ }
+ /* Block 5L, LOW BAND INVQBL */
+ wd2 = (s->band[0].det*wd2) >> 15;
+ /* Block 5L, RECONS */
+ rlow = s->band[0].s + wd2;
+ /* Block 6L, LIMIT */
+ if (rlow > 16383)
+ rlow = 16383;
+ else if (rlow < -16384)
+ rlow = -16384;
+
+ /* Block 2L, INVQAL */
+ wd2 = qm4[wd1];
+ dlowt = (s->band[0].det*wd2) >> 15;
+
+ /* Block 3L, LOGSCL */
+ wd2 = rl42[wd1];
+ wd1 = (s->band[0].nb*127) >> 7;
+ wd1 += wl[wd2];
+ if (wd1 < 0)
+ wd1 = 0;
+ else if (wd1 > 18432)
+ wd1 = 18432;
+ s->band[0].nb = wd1;
+
+ /* Block 3L, SCALEL */
+ wd1 = (s->band[0].nb >> 6) & 31;
+ wd2 = 8 - (s->band[0].nb >> 11);
+ wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2);
+ s->band[0].det = wd3 << 2;
+
+ block4(s, 0, dlowt);
+
+ if (!s->eight_k)
+ {
+ /* Block 2H, INVQAH */
+ wd2 = qm2[ihigh];
+ dhigh = (s->band[1].det*wd2) >> 15;
+ /* Block 5H, RECONS */
+ rhigh = dhigh + s->band[1].s;
+ /* Block 6H, LIMIT */
+ if (rhigh > 16383)
+ rhigh = 16383;
+ else if (rhigh < -16384)
+ rhigh = -16384;
+
+ /* Block 2H, INVQAH */
+ wd2 = rh2[ihigh];
+ wd1 = (s->band[1].nb*127) >> 7;
+ wd1 += wh[wd2];
+ if (wd1 < 0)
+ wd1 = 0;
+ else if (wd1 > 22528)
+ wd1 = 22528;
+ s->band[1].nb = wd1;
+
+ /* Block 3H, SCALEH */
+ wd1 = (s->band[1].nb >> 6) & 31;
+ wd2 = 10 - (s->band[1].nb >> 11);
+ wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2);
+ s->band[1].det = wd3 << 2;
+
+ block4(s, 1, dhigh);
+ }
+
+ if (s->itu_test_mode)
+ {
+ amp[outlen++] = (int16_t) (rlow << 1);
+ amp[outlen++] = (int16_t) (rhigh << 1);
+ }
+ else
+ {
+ if (s->eight_k)
+ {
+ amp[outlen++] = (int16_t) rlow;
+ }
+ else
+ {
+ /* Apply the receive QMF */
+ for (i = 0; i < 22; i++)
+ s->x[i] = s->x[i + 2];
+ s->x[22] = rlow + rhigh;
+ s->x[23] = rlow - rhigh;
+
+ xout1 = 0;
+ xout2 = 0;
+ for (i = 0; i < 12; i++)
+ {
+ xout2 += s->x[2*i]*qmf_coeffs[i];
+ xout1 += s->x[2*i + 1]*qmf_coeffs[11 - i];
+ }
+ amp[outlen++] = (int16_t) (xout1 >> 12);
+ amp[outlen++] = (int16_t) (xout2 >> 12);
+ }
+ }
+ }
+ return outlen;
+}
+/*- End of function --------------------------------------------------------*/
+/*- End of file ------------------------------------------------------------*/
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