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/*
* FILE: codec_g726.c
* AUTHORS: Orion Hodson
*
* Copyright (c) 1998-2001 University College London
* All rights reserved.
*/
#ifndef HIDE_SOURCE_STRINGS
static const char cvsid[] =
"$Id: codec_g726.c,v 1.18 2001/03/28 14:22:43 ucacoxh Exp $";
#endif /* HIDE_SOURCE_STRINGS */
#include "config_unix.h"
#include "config_win32.h"
#include "memory.h"
#include "util.h"
#include "debug.h"
#include "audio_types.h"
#include "codec_types.h"
#include "codec_g726.h"
#include "cx_g726.h"
#include "bitstream.h"
#define CODEC_PAYLOAD_NO(x) (x)
#define G726_SAMPLES_PER_FRAME 160
static codec_format_t cs[] = {
/* G726-40 **********************************************/
{"G726-40", "G726-40-8K-Mono",
"ITU G.726-40 ADPCM codec. Sun Microsystems public implementation.",
CODEC_PAYLOAD_NO(107), 0, 100,
{DEV_S16, 8000, 16, 1, G726_SAMPLES_PER_FRAME * BYTES_PER_SAMPLE}}, /* 20 ms */
{"G726-40", "G726-40-16K-Mono",
"ITU G.726-40 ADPCM codec. Sun Microsystems public implementation.",
CODEC_PAYLOAD_NO(108), 0, 100,
{DEV_S16, 16000, 16, 1, G726_SAMPLES_PER_FRAME * BYTES_PER_SAMPLE}}, /* 10 ms */
{"G726-40", "G726-40-32K-Mono",
"ITU G.726-40 ADPCM codec. Sun Microsystems public implementation.",
CODEC_PAYLOAD_NO(110), 0, 100,
{DEV_S16, 32000, 16, 1, G726_SAMPLES_PER_FRAME * BYTES_PER_SAMPLE}}, /* 5 ms */
{"G726-40", "G726-40-48K-Mono",
"ITU G.726-40 ADPCM codec. Sun Microsystems public implementation.",
CODEC_PAYLOAD_NO(120), 0, 100,
{DEV_S16, 48000, 16, 1, G726_SAMPLES_PER_FRAME * BYTES_PER_SAMPLE}}, /* 3.3 ms */
/* G726-32 ***********************************************/
{"G726-32", "G726-32-8K-Mono",
"ITU G.726-32 ADPCM codec. Sun Microsystems public implementation.",
CODEC_PAYLOAD_NO(2), 0, 80,
{DEV_S16, 8000, 16, 1, G726_SAMPLES_PER_FRAME * BYTES_PER_SAMPLE}}, /* 20 ms */
{"G726-32", "G726-32-16K-Mono",
"ITU G.726-32 ADPCM codec. Sun Microsystems public implementation.",
CODEC_PAYLOAD_NO(104), 0, 80,
{DEV_S16, 16000, 16, 1, G726_SAMPLES_PER_FRAME * BYTES_PER_SAMPLE}}, /* 10 ms */
{"G726-32", "G726-32-32K-Mono",
"ITU G.726-32 ADPCM codec. Sun Microsystems public implementation.",
CODEC_PAYLOAD_NO(105), 0, 80,
{DEV_S16, 32000, 16, 1, G726_SAMPLES_PER_FRAME * BYTES_PER_SAMPLE}}, /* 5 ms */
{"G726-32", "G726-32-48K-Mono",
"ITU G.726-32 ADPCM codec. Sun Microsystems public implementation.",
CODEC_PAYLOAD_NO(106), 0, 80,
{DEV_S16, 48000, 16, 1, G726_SAMPLES_PER_FRAME * BYTES_PER_SAMPLE}}, /* 3.3 ms */
/* Entries 0-3 G726-24 ***********************************************/
{"G726-24", "G726-24-8K-Mono",
"ITU G.726-24 ADPCM codec. Sun Microsystems public implementation.",
CODEC_PAYLOAD_NO(100), 0, 60,
{DEV_S16, 8000, 16, 1, G726_SAMPLES_PER_FRAME * BYTES_PER_SAMPLE}}, /* 20 ms */
{"G726-24", "G726-24-16K-Mono",
"ITU G.726-24 ADPCM codec. Sun Microsystems public implementation.",
CODEC_PAYLOAD_NO(101), 0, 60,
{DEV_S16, 16000, 16, 1, G726_SAMPLES_PER_FRAME * BYTES_PER_SAMPLE}}, /* 10 ms */
{"G726-24", "G726-24-32K-Mono",
"ITU G.726-24 ADPCM codec. Sun Microsystems public implementation.",
CODEC_PAYLOAD_NO(102), 0, 60,
{DEV_S16, 32000, 16, 1, G726_SAMPLES_PER_FRAME * BYTES_PER_SAMPLE}}, /* 5 ms */
{"G726-24", "G726-24-48K-Mono",
"ITU G.726-24 ADPCM codec. Sun Microsystems public implementation.",
CODEC_PAYLOAD_NO(103), 0, 60,
{DEV_S16, 48000, 16, 1, G726_SAMPLES_PER_FRAME * BYTES_PER_SAMPLE}}, /* 3.3 ms */
/* G726-16 ***********************************************/
{"G726-16", "G726-16-8K-Mono",
"ITU G.726-16 ADPCM codec. Marc Randolph modified Sun Microsystems public implementation.",
CODEC_PAYLOAD_NO(96), 0, 40,
{DEV_S16, 8000, 16, 1, G726_SAMPLES_PER_FRAME * BYTES_PER_SAMPLE}}, /* 20 ms */
{"G726-16", "G726-16-16K-Mono",
"ITU G.726-16 ADPCM codec. Marc Randolph modified Sun Microsystems public implementation.",
CODEC_PAYLOAD_NO(97), 0, 40,
{DEV_S16, 16000, 16, 1, G726_SAMPLES_PER_FRAME * BYTES_PER_SAMPLE}}, /* 10 ms */
{"G726-16", "G726-16-32K-Mono",
"ITU G.726-16 ADPCM codec. Marc Randolph modified Sun Microsystems public implementation.",
CODEC_PAYLOAD_NO(98), 0, 40,
{DEV_S16, 32000, 16, 1, G726_SAMPLES_PER_FRAME * BYTES_PER_SAMPLE}}, /* 5 ms */
{"G726-16", "G726-16-48K-Mono",
"ITU G.726-16 ADPCM codec. Marc Randolph modified Sun Microsystems public implementation.",
CODEC_PAYLOAD_NO(99), 0, 40,
{DEV_S16, 48000, 16, 1, G726_SAMPLES_PER_FRAME * BYTES_PER_SAMPLE}}, /* 3.3 ms */
};
#define G726_16 3
#define G726_24 2
#define G726_32 1
#define G726_40 0
#define G726_NUM_FORMATS sizeof(cs)/sizeof(codec_format_t)
/* In G726_NUM_RATES, 4 one for 16, 24, 32, 48 */
#define G726_NUM_RATES (G726_NUM_FORMATS / 4)
typedef struct {
struct g726_state *gs;
} g726_t;
uint16_t
g726_get_formats_count()
{
return (uint16_t)G726_NUM_FORMATS;
}
const codec_format_t *
g726_get_format(uint16_t idx)
{
assert(idx < G726_NUM_FORMATS);
return &cs[idx];
}
int
g726_state_create(uint16_t idx, u_char **s)
{
g726_t *g;
if (idx >= G726_NUM_FORMATS) {
return FALSE;
}
g = (g726_t*)xmalloc(sizeof(g726_t));
if (g == NULL) {
return FALSE;
}
g->gs = (struct g726_state*)xmalloc(sizeof(struct g726_state));
if (g->gs == NULL) {
xfree(g);
return FALSE;
}
g726_init_state(g->gs);
*s = (u_char*)g;
return TRUE;
}
void
g726_state_destroy(uint16_t idx, u_char **s)
{
g726_t *g;
assert(idx < G726_NUM_FORMATS);
g = (g726_t*)*s;
xfree(g->gs);
xfree(g);
*s = (u_char*)NULL;
UNUSED(idx);
}
/* G726 packing is little endian (i.e. gratuitously painful on modern
* machines) */
static int
g726_pack(u_char *buf, u_char *cw, u_char num_cw, int bps)
{
int i, bits = 0, x = 0;
for (i = 0; i < num_cw; i++) {
buf[x] |= cw[i] << bits;
bits += bps;
assert((bits != 8) || (i == num_cw - 1));
if (bits > 8) {
bits &= 0x07;
x++;
buf[x] |= cw[i] >> (bps - bits);
}
}
return (num_cw * bps / 8);
}
static int
g726_unpack(u_char *cw, u_char *buf, u_char num_cw, int bps)
{
int i = 0, bits = 0, x = 0;
u_char mask = 0;
while (i < bps) {
mask |= 1 << i;
i++;
}
for(i = 0; i < num_cw; i++) {
cw[i] = (buf[x] >> bits) & mask;
bits += bps;
assert((bits != 8) || (i == num_cw - 1));
if (bits > 8) {
bits &= 0x07;
x++;
cw[i] |= buf[x] << (bps - bits);
cw[i] &= mask;
}
}
xmemchk();
return (num_cw * bps / 8);
}
int
g726_encode(uint16_t idx, u_char *encoder_state, sample *inbuf, coded_unit *c)
{
register sample *s;
g726_t *g;
int i;
u_char cw[8]; /* Maximum of 8 codewords in octet aligned packing */
u_char *out;
assert(encoder_state);
assert(inbuf);
assert(idx < G726_NUM_FORMATS);
s = inbuf;
g = (g726_t*)encoder_state;
c->state = NULL;
c->state_len = 0;
c->data = (u_char*)block_alloc(cs[idx].mean_coded_frame_size);
c->data_len = cs[idx].mean_coded_frame_size;
memset(c->data, 0, c->data_len);
out = c->data;
idx = idx / G726_NUM_RATES;
switch(idx) {
case G726_16:
for(i = 0; i < G726_SAMPLES_PER_FRAME; i += 4) {
cw[0] = g726_16_encoder(s[i], AUDIO_ENCODING_LINEAR, g->gs);
cw[1] = g726_16_encoder(s[i + 1], AUDIO_ENCODING_LINEAR, g->gs);
cw[2] = g726_16_encoder(s[i + 2], AUDIO_ENCODING_LINEAR, g->gs);
cw[3] = g726_16_encoder(s[i + 3], AUDIO_ENCODING_LINEAR, g->gs);
out += g726_pack(out, cw, 4, 2);
}
break;
case G726_24:
for(i = 0; i < G726_SAMPLES_PER_FRAME; i += 8) {
cw[0] = g726_24_encoder(s[i], AUDIO_ENCODING_LINEAR, g->gs);
cw[1] = g726_24_encoder(s[i + 1], AUDIO_ENCODING_LINEAR, g->gs);
cw[2] = g726_24_encoder(s[i + 2], AUDIO_ENCODING_LINEAR, g->gs);
cw[3] = g726_24_encoder(s[i + 3], AUDIO_ENCODING_LINEAR, g->gs);
cw[4] = g726_24_encoder(s[i + 4], AUDIO_ENCODING_LINEAR, g->gs);
cw[5] = g726_24_encoder(s[i + 5], AUDIO_ENCODING_LINEAR, g->gs);
cw[6] = g726_24_encoder(s[i + 6], AUDIO_ENCODING_LINEAR, g->gs);
cw[7] = g726_24_encoder(s[i + 7], AUDIO_ENCODING_LINEAR, g->gs);
out += g726_pack(out, cw, 8, 3);
}
break;
case G726_32:
for(i = 0; i < G726_SAMPLES_PER_FRAME; i += 2) {
cw[0] = g726_32_encoder(s[i], AUDIO_ENCODING_LINEAR, g->gs);
cw[1] = g726_32_encoder(s[i + 1], AUDIO_ENCODING_LINEAR, g->gs);
out += g726_pack(out, cw, 2, 4);
}
break;
case G726_40:
for(i = 0; i < G726_SAMPLES_PER_FRAME; i += 8) {
cw[0] = g726_40_encoder(s[i], AUDIO_ENCODING_LINEAR, g->gs);
cw[1] = g726_40_encoder(s[i + 1], AUDIO_ENCODING_LINEAR, g->gs);
cw[2] = g726_40_encoder(s[i + 2], AUDIO_ENCODING_LINEAR, g->gs);
cw[3] = g726_40_encoder(s[i + 3], AUDIO_ENCODING_LINEAR, g->gs);
cw[4] = g726_40_encoder(s[i + 4], AUDIO_ENCODING_LINEAR, g->gs);
cw[5] = g726_40_encoder(s[i + 5], AUDIO_ENCODING_LINEAR, g->gs);
cw[6] = g726_40_encoder(s[i + 6], AUDIO_ENCODING_LINEAR, g->gs);
cw[7] = g726_40_encoder(s[i + 7], AUDIO_ENCODING_LINEAR, g->gs);
out += g726_pack(out, cw, 8, 5);
}
break;
}
return c->data_len;
}
int
g726_decode(uint16_t idx, u_char *decoder_state, coded_unit *c, sample *dst)
{
u_char cw[8], *in;
int i;
g726_t *g;
/* paranoia! */
assert(decoder_state != NULL);
assert(c != NULL);
assert(dst != NULL);
assert(idx < G726_NUM_FORMATS);
assert(c->state_len == 0);
assert(c->data_len == cs[idx].mean_coded_frame_size);
g = (g726_t*)decoder_state;
in = c->data;
idx = idx / G726_NUM_RATES;
switch(idx) {
case G726_16:
for(i = 0; i < G726_SAMPLES_PER_FRAME; i += 4) {
in += g726_unpack(cw, in, 4, 2);
dst[i + 0] = (sample)g726_16_decoder(cw[0], AUDIO_ENCODING_LINEAR, g->gs);
dst[i + 1] = (sample)g726_16_decoder(cw[1], AUDIO_ENCODING_LINEAR, g->gs);
dst[i + 2] = (sample)g726_16_decoder(cw[2], AUDIO_ENCODING_LINEAR, g->gs);
dst[i + 3] = (sample)g726_16_decoder(cw[3], AUDIO_ENCODING_LINEAR, g->gs);
}
break;
case G726_24:
for(i = 0; i < G726_SAMPLES_PER_FRAME; i += 8) {
in += g726_unpack(cw, in, 8, 3);
dst[i + 0] = (sample)g726_24_decoder(cw[0], AUDIO_ENCODING_LINEAR, g->gs);
dst[i + 1] = (sample)g726_24_decoder(cw[1], AUDIO_ENCODING_LINEAR, g->gs);
dst[i + 2] = (sample)g726_24_decoder(cw[2], AUDIO_ENCODING_LINEAR, g->gs);
dst[i + 3] = (sample)g726_24_decoder(cw[3], AUDIO_ENCODING_LINEAR, g->gs);
dst[i + 4] = (sample)g726_24_decoder(cw[4], AUDIO_ENCODING_LINEAR, g->gs);
dst[i + 5] = (sample)g726_24_decoder(cw[5], AUDIO_ENCODING_LINEAR, g->gs);
dst[i + 6] = (sample)g726_24_decoder(cw[6], AUDIO_ENCODING_LINEAR, g->gs);
dst[i + 7] = (sample)g726_24_decoder(cw[7], AUDIO_ENCODING_LINEAR, g->gs);
}
break;
case G726_32:
for(i = 0; i < G726_SAMPLES_PER_FRAME; i += 2) {
in += g726_unpack(cw, in, 2, 4);
dst[i + 0] = (sample)g726_32_decoder(cw[0], AUDIO_ENCODING_LINEAR, g->gs);
dst[i + 1] = (sample)g726_32_decoder(cw[1], AUDIO_ENCODING_LINEAR, g->gs);
}
break;
case G726_40:
for(i = 0; i < G726_SAMPLES_PER_FRAME; i += 8) {
in += g726_unpack(cw, in, 8, 5);
dst[i + 0] = (sample)g726_40_decoder(cw[0], AUDIO_ENCODING_LINEAR, g->gs);
dst[i + 1] = (sample)g726_40_decoder(cw[1], AUDIO_ENCODING_LINEAR, g->gs);
dst[i + 2] = (sample)g726_40_decoder(cw[2], AUDIO_ENCODING_LINEAR, g->gs);
dst[i + 3] = (sample)g726_40_decoder(cw[3], AUDIO_ENCODING_LINEAR, g->gs);
dst[i + 4] = (sample)g726_40_decoder(cw[4], AUDIO_ENCODING_LINEAR, g->gs);
dst[i + 5] = (sample)g726_40_decoder(cw[5], AUDIO_ENCODING_LINEAR, g->gs);
dst[i + 6] = (sample)g726_40_decoder(cw[6], AUDIO_ENCODING_LINEAR, g->gs);
dst[i + 7] = (sample)g726_40_decoder(cw[7], AUDIO_ENCODING_LINEAR, g->gs);
}
break;
}
return c->data_len;
}
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