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1/*
2
3 This program is part of the TACLeBench benchmark suite.
4 Version V 1.x
5
6 Name: g723_enc
7
8 Author: Unknown
9
10 Function: g723 encoder.
11
12 Source: SUN Microsystems
13
14 Changes: The benchmark was changed to use the g723 encoder
15
16 License: "Unrestricted use" (see license.txt)
17
18*/
19
20/*
21 Declaration of data types
22*/
23
24/*
25 The following is the definition of the state structure
26 used by the G.721/G.723 encoder and decoder to preserve their internal
27 state between successive calls. The meanings of the majority
28 of the state structure fields are explained in detail in the
29 CCITT Recommendation G.721. The field names are essentially indentical
30 to variable names in the bit level description of the coding algorithm
31 included in this Recommendation.
32*/
33
34#include "extra.h"
35struct g723_enc_state_t {
36 long yl; /* Locked or steady state step size multiplier. */
37 short yu; /* Unlocked or non-steady state step size multiplier. */
38 short dms; /* Short term energy estimate. */
39 short dml; /* Long term energy estimate. */
40 short ap; /* Linear weighting coefficient of 'yl' and 'yu'. */
41
42 short a[2]; /* Coefficients of pole portion of prediction filter. */
43 short b[6]; /* Coefficients of zero portion of prediction filter. */
44 short pk[2]; /*
45 Signs of previous two samples of a partially
46 reconstructed signal.
47*/
48 short dq[6]; /*
49 Previous 6 samples of the quantized difference
50 signal represented in an internal floating point
51 format.
52*/
53 short sr[2]; /*
54 Previous 2 samples of the quantized difference
55 signal represented in an internal floating point
56 format.
57*/
58 char td; /* delayed tone detect, new in 1988 version */
59};
60
61
62/*
63 Forward declaration of functions
64*/
65
66int g723_enc_abs( int num );
67void g723_enc_init_state( struct g723_enc_state_t *state_ptr );
68int g723_enc_predictor_zero( struct g723_enc_state_t *state_ptr );
69int g723_enc_fmult( int an, int srn );
70int g723_enc_predictor_pole( struct g723_enc_state_t *state_ptr );
71int g723_enc_step_size( struct g723_enc_state_t *state_ptr );
72int g723_enc_quantize(
73 int d, /* Raw difference signal sample */
74 int y, /* Step size multiplier */
75 short *table, /* quantization table */
76 int size ); /* table size of short integers */
77int g723_enc_reconstruct(
78 int sign, /* 0 for non-negative value */
79 int dqln, /* G.72x codeword */
80 int y ); /* Step size multiplier */
81void g723_enc_update(
82 int code_size, /* distinguish 723_40 with others */
83 int y, /* quantizer step size */
84 int wi, /* scale factor multiplier */
85 int fi, /* for long/short term energies */
86 int dq, /* quantized prediction difference */
87 int sr, /* reconstructed signal */
88 int dqsez, /* difference from 2-pole predictor */
89 struct g723_enc_state_t *state_ptr ); /* coder state pointer */
90int g723_enc_quan(
91 int val,
92 short *table,
93 int size );
94int g723_enc_search(
95 int val,
96 short *table,
97 int size );
98int g723_enc_alaw2linear( unsigned char a_val );
99int g723_enc_ulaw2linear( unsigned char u_val );
100int g723_enc_g723_24_encoder(
101 int sample,
102 int in_coding,
103 struct g723_enc_state_t *state_ptr );
104int g723_enc_pack_output(
105 unsigned char code,
106 int bits );
107
108void g723_enc_init();
109int g723_enc_return();
110void g723_enc_main();
111//int main( void );
112
113/*
114 Declaration of global variables
115*/
116
117struct g723_enc_state_t g723_enc_state;
118
119unsigned int g723_enc_INPUT[256] = {
120 51, 17, 31, 53, 95, 17, 70, 22, 49, 12, 8, 39, 28, 37, 99, 54,
121 77, 65, 77, 78, 83, 15, 63, 31, 35, 92, 52, 40, 61, 79, 94, 87,
122 87, 68, 76, 58, 39, 35, 20, 83, 42, 46, 98, 12, 21, 96, 74, 41,
123 78, 76, 96, 2, 32, 76, 24, 59, 4, 96, 32, 5, 44, 92, 57, 12,
124 57, 25, 50, 23, 48, 41, 88, 43, 36, 38, 4, 16, 52, 70, 9, 40,
125 78, 24, 34, 23, 30, 30, 89, 3, 65, 40, 68, 73, 94, 23, 84, 97,
126 78, 43, 68, 81, 16, 28, 13, 87, 75, 21, 14, 29, 81, 22, 56, 72,
127 19, 99, 25, 43, 76, 86, 90, 98, 39, 43, 12, 46, 24, 99, 65, 61,
128 24, 45, 79, 7, 48, 15, 24, 95, 62, 99, 48, 80, 75, 38, 48, 53,
129 9, 60, 35, 14, 78, 71, 45, 71, 9, 97, 55, 74, 58, 64, 78, 18,
130 30, 28, 69, 29, 57, 42, 30, 44, 57, 49, 61, 42, 13, 25, 3, 98,
131 11, 38, 65, 35, 55, 36, 57, 48, 16, 62, 17, 56, 29, 88, 84, 85,
132 90, 60, 54, 16, 66, 69, 26, 10, 82, 19, 42, 35, 84, 13, 26, 17,
133 48, 38, 50, 50, 35, 53, 12, 52, 61, 74, 56, 34, 80, 59, 26, 67,
134 55, 79, 89, 89, 6, 80, 91, 65, 16, 30, 16, 28, 85, 54, 3, 20,
135 2, 36, 62, 52, 55, 15, 83, 3, 2, 38, 62, 2, 63, 92, 37, 73
136};
137
138
139
140unsigned int g723_enc_OUTPUT[256];
141
142short g723_enc_power2[15] = {1, 2, 4, 8, 0x10, 0x20, 0x40, 0x80,
143 0x100, 0x200, 0x400, 0x800, 0x1000, 0x2000, 0x4000
144 };
145
146
147/*
148 Maps G.723_24 code word to reconstructed scale factor normalized log
149 magnitude values.
150*/
151
152short g723_enc_qtab_723_24[3] = {8, 218, 331};
153
154/*
155 Maps G.721 code word to reconstructed scale factor normalized log
156 magnitude values.
157*/
158short g723_enc_dqlntab[16] = { -2048, 4, 135, 213, 273, 323, 373, 425,
159 425, 373, 323, 273, 213, 135, 4, -2048
160 };
161
162/* Maps G.721 code word to log of scale factor multiplier. */
163short g723_enc_witab[16] = { -12, 18, 41, 64, 112, 198, 355, 1122,
164 1122, 355, 198, 112, 64, 41, 18, -12
165 };
166/*
167 Maps G.721 code words to a set of values whose long and short
168 term averages are computed and then compared to give an indication
169 how stationary (steady state) the signal is.
170*/
171short g723_enc_fitab[16] = {0, 0, 0, 0x200, 0x200, 0x200, 0x600, 0xE00,
172 0xE00, 0x600, 0x200, 0x200, 0x200, 0, 0, 0
173 };
174
175static unsigned int g723_enc_out_buffer = 0;
176static int g723_enc_out_bits = 0;
177static int g723_enc_i = 0;
178
179/*
180 Declaration of macros
181*/
182
183
184#define AUDIO_ENCODING_ULAW (1) /* ISDN u-law */
185#define AUDIO_ENCODING_ALAW (2) /* ISDN A-law */
186#define AUDIO_ENCODING_LINEAR (3) /* PCM 2's-complement (0-center) */
187
188#define BIAS (0x84) /* Bias for linear code. */
189
190#define SIGN_BIT (0x80) /* Sign bit for a A-law byte. */
191#define QUANT_MASK (0xf) /* Quantization field mask. */
192#define SEG_SHIFT (4) /* Left shift for segment number. */
193#define SEG_MASK (0x70) /* Segment field mask. */
194
195/*
196 Arithmetic math functions
197*/
198
199/*
200 g723_enc_fmult()
201
202 returns the integer product of the 14-bit integer "an" and