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/*
* FILE: codec_g728.c
* AUTHORS: Orion Hodson
*
* Copyright (c) 2000-2001 University College London
* All rights reserved.
*/
#ifndef HIDE_SOURCE_STRINGS
static const char cvsid[] =
"$Id: codec_g728.c,v 1.2 2001/02/18 10:45:30 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_g728.h"
#include "bitstream.h"
#include "g728lib.h"
#define CODEC_PAYLOAD_NO(x) (x)
/* G728's frame size is 5 samples, RTP payload requires 4 G728 to make
* RTP unit. */
#define G728_SAMPLES_PER_RTPFRAME 20
#define G728_RTPFRAME_SIZE 5
#define G728_SAMPLES_PER_FRAME 5
/* ------------------------------------------------------------------------- */
/* Capability advertising */
static codec_format_t cs[] = {
{
"G728", "G728-8K-Mono",
"ITU G.728 LD-CELP codec.",
CODEC_PAYLOAD_NO(15),
0,
G728_RTPFRAME_SIZE,
{
DEV_S16, 8000, 16, 1,
G728_SAMPLES_PER_RTPFRAME *
BYTES_PER_SAMPLE
}
}
};
#define G728_NUM_FORMATS sizeof(cs)/sizeof(codec_format_t)
uint16_t
g728_get_formats_count()
{
return (uint16_t)G728_NUM_FORMATS;
}
const codec_format_t *
g728_get_format(uint16_t idx)
{
assert(idx < G728_NUM_FORMATS);
return &cs[idx];
}
/* ------------------------------------------------------------------------- */
/* Encoder specifics */
int
g728_encoder_create(uint16_t idx, u_char **s)
{
assert(idx < G728_NUM_FORMATS);
*s = NULL;
g728_encoder_init();
return TRUE;
}
void
g728_encoder_destroy(uint16_t idx, u_char **s)
{
assert(idx < G728_NUM_FORMATS);
assert(*s == NULL);
UNUSED(idx);
}
int
g728_encoder_do(uint16_t idx, u_char *encoder_state, sample *inbuf, coded_unit *c)
{
bitstream_t *bs;
int16_t cw;
int i;
assert(encoder_state == NULL);
assert(inbuf);
assert(idx < G728_NUM_FORMATS);
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);
bs_create(&bs);
bs_attach(bs, c->data, c->data_len);
for (i = 0; i < G728_SAMPLES_PER_RTPFRAME; i += G728_SAMPLES_PER_FRAME) {
g728_encode(&cw, inbuf + i , G728_SAMPLES_PER_FRAME);
bs_put(bs, (u_char)(cw >> 8), 2);
bs_put(bs, (u_char)(cw & 0xff), 8);
}
bs_destroy(&bs);
return c->data_len;
}
/* ------------------------------------------------------------------------- */
/* Decoder specifics */
int
g728_decoder_create(uint16_t idx, u_char **s)
{
assert(idx < G728_NUM_FORMATS);
*s = NULL;
g728_decoder_init();
return TRUE;
}
void
g728_decoder_destroy(uint16_t idx, u_char **s)
{
assert(idx < G728_NUM_FORMATS);
assert(*s == NULL);
UNUSED(idx);
}
int
g728_decoder_do(uint16_t idx, u_char *decoder_state, coded_unit *c, sample *dst)
{
bitstream_t *bs;
int16_t cw;
int i;
assert(decoder_state == NULL);
assert(c != NULL);
assert(dst != NULL);
assert(idx < G728_NUM_FORMATS);
assert(c->state_len == 0);
assert(c->data_len == cs[idx].mean_coded_frame_size);
bs_create(&bs);
bs_attach(bs, c->data, c->data_len);
for(i = 0; i < G728_SAMPLES_PER_RTPFRAME / G728_SAMPLES_PER_FRAME; i++) {
cw = (bs_get(bs, 2) << 8) | bs_get(bs, 8);
g728_decode(dst + i * G728_SAMPLES_PER_FRAME, G728_SAMPLES_PER_FRAME, &cw);
}
bs_destroy(&bs);
return c->data_len;
}
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