Translate between signed linear and LPC10 (Linear Predictor Code) More...
#include "asterisk.h"#include "asterisk/translate.h"#include "asterisk/config.h"#include "asterisk/module.h"#include "asterisk/utils.h"#include "lpc10/lpc10.h"#include "asterisk/slin.h"#include "ex_lpc10.h"
Go to the source code of this file.
Data Structures | |
| struct | lpc10_coder_pvt |
Defines | |
| #define | BUFFER_SAMPLES 8000 |
| #define | LPC10_BYTES_IN_COMPRESSED_FRAME (LPC10_BITS_IN_COMPRESSED_FRAME + 7)/8 |
Functions | |
| static void | __reg_module (void) |
| static void | __unreg_module (void) |
| static void | build_bits (unsigned char *c, INT32 *bits) |
| static void | extract_bits (INT32 *bits, unsigned char *c) |
| static int | lintolpc10_framein (struct ast_trans_pvt *pvt, struct ast_frame *f) |
| static struct ast_frame * | lintolpc10_frameout (struct ast_trans_pvt *pvt) |
| static int | load_module (void) |
| static int | lpc10_dec_new (struct ast_trans_pvt *pvt) |
| static void | lpc10_destroy (struct ast_trans_pvt *arg) |
| static int | lpc10_enc_new (struct ast_trans_pvt *pvt) |
| static int | lpc10tolin_framein (struct ast_trans_pvt *pvt, struct ast_frame *f) |
| static int | reload (void) |
| static int | unload_module (void) |
Variables | |
| static struct ast_module_info | __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "LPC10 2.4kbps Coder/Decoder" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .reload = reload, } |
| static struct ast_module_info * | ast_module_info = &__mod_info |
| static struct ast_translator | lintolpc10 |
| static struct ast_translator | lpc10tolin |
Detailed Description
Translate between signed linear and LPC10 (Linear Predictor Code)
Definition in file codec_lpc10.c.
Define Documentation
| #define BUFFER_SAMPLES 8000 |
Definition at line 56 of file codec_lpc10.c.
Referenced by lintolpc10_framein(), and lpc10tolin_framein().
| #define LPC10_BYTES_IN_COMPRESSED_FRAME (LPC10_BITS_IN_COMPRESSED_FRAME + 7)/8 |
Definition at line 54 of file codec_lpc10.c.
Referenced by lintolpc10_frameout(), and lpc10tolin_framein().
Function Documentation
| static void __reg_module | ( | void | ) | [static] |
Definition at line 259 of file codec_lpc10.c.
| static void __unreg_module | ( | void | ) | [static] |
Definition at line 259 of file codec_lpc10.c.
| static void build_bits | ( | unsigned char * | c, |
| INT32 * | bits | ||
| ) | [static] |
Definition at line 96 of file codec_lpc10.c.
Referenced by lintolpc10_frameout().
{
unsigned char mask=0x80;
int x;
*c = 0;
for (x=0;x<LPC10_BITS_IN_COMPRESSED_FRAME;x++) {
if (bits[x])
*c |= mask;
mask = mask >> 1;
if ((x % 8)==7) {
c++;
*c = 0;
mask = 0x80;
}
}
}
| static void extract_bits | ( | INT32 * | bits, |
| unsigned char * | c | ||
| ) | [static] |
Definition at line 82 of file codec_lpc10.c.
Referenced by lpc10tolin_framein().
{
int x;
for (x=0;x<LPC10_BITS_IN_COMPRESSED_FRAME;x++) {
if (*c & (0x80 >> (x & 7)))
bits[x] = 1;
else
bits[x] = 0;
if ((x & 7) == 7)
c++;
}
}
| static int lintolpc10_framein | ( | struct ast_trans_pvt * | pvt, |
| struct ast_frame * | f | ||
| ) | [static] |
Definition at line 146 of file codec_lpc10.c.
References ast_log(), lpc10_coder_pvt::buf, BUFFER_SAMPLES, ast_frame::data, ast_frame::datalen, LOG_WARNING, ast_frame::ptr, ast_trans_pvt::pvt, ast_trans_pvt::samples, and ast_frame::samples.
{
struct lpc10_coder_pvt *tmp = pvt->pvt;
/* Just add the frames to our stream */
if (pvt->samples + f->samples > BUFFER_SAMPLES) {
ast_log(LOG_WARNING, "Out of buffer space\n");
return -1;
}
memcpy(tmp->buf + pvt->samples, f->data.ptr, f->datalen);
pvt->samples += f->samples;
return 0;
}
| static struct ast_frame* lintolpc10_frameout | ( | struct ast_trans_pvt * | pvt | ) | [static, read] |
Definition at line 160 of file codec_lpc10.c.
References ast_trans_frameout(), lpc10_coder_pvt::buf, build_bits(), lpc10_coder_pvt::enc, lpc10_coder_pvt::longer, lpc10_coder_pvt::lpc10, LPC10_BYTES_IN_COMPRESSED_FRAME, ast_trans_pvt::outbuf, ast_trans_pvt::pvt, ast_trans_pvt::samples, and ast_trans_pvt::uc.
{
struct lpc10_coder_pvt *tmp = pvt->pvt;
int x;
int datalen = 0; /* output frame */
int samples = 0; /* output samples */
float tmpbuf[LPC10_SAMPLES_PER_FRAME];
INT32 bits[LPC10_BITS_IN_COMPRESSED_FRAME]; /* XXX what ??? */
/* We can't work on anything less than a frame in size */
if (pvt->samples < LPC10_SAMPLES_PER_FRAME)
return NULL;
while (pvt->samples >= LPC10_SAMPLES_PER_FRAME) {
/* Encode a frame of data */
for (x=0;x<LPC10_SAMPLES_PER_FRAME;x++)
tmpbuf[x] = (float)tmp->buf[x + samples] / 32768.0;
lpc10_encode(tmpbuf, bits, tmp->lpc10.enc);
build_bits(pvt->outbuf.uc + datalen, bits);
datalen += LPC10_BYTES_IN_COMPRESSED_FRAME;
samples += LPC10_SAMPLES_PER_FRAME;
pvt->samples -= LPC10_SAMPLES_PER_FRAME;
/* Use one of the two left over bits to record if this is a 22 or 23 ms frame...
important for IAX use */
tmp->longer = 1 - tmp->longer;
}
/* Move the data at the end of the buffer to the front */
if (pvt->samples)
memmove(tmp->buf, tmp->buf + samples, pvt->samples * 2);
return ast_trans_frameout(pvt, datalen, samples);
}
| static int load_module | ( | void | ) | [static] |
Definition at line 241 of file codec_lpc10.c.
References AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_SUCCESS, ast_register_translator, and ast_unregister_translator().
{
int res;
res = ast_register_translator(&lpc10tolin);
if (!res)
res = ast_register_translator(&lintolpc10);
else
ast_unregister_translator(&lpc10tolin);
if (res)
return AST_MODULE_LOAD_FAILURE;
return AST_MODULE_LOAD_SUCCESS;
}
| static int lpc10_dec_new | ( | struct ast_trans_pvt * | pvt | ) | [static] |
Definition at line 75 of file codec_lpc10.c.
References lpc10_coder_pvt::dec, lpc10_coder_pvt::lpc10, and ast_trans_pvt::pvt.
{
struct lpc10_coder_pvt *tmp = pvt->pvt;
return (tmp->lpc10.dec = create_lpc10_decoder_state()) ? 0 : -1;
}
| static void lpc10_destroy | ( | struct ast_trans_pvt * | arg | ) | [static] |
Definition at line 191 of file codec_lpc10.c.
References ast_free, lpc10_coder_pvt::enc, lpc10_coder_pvt::lpc10, and ast_trans_pvt::pvt.
{
struct lpc10_coder_pvt *pvt = arg->pvt;
/* Enc and DEC are both just allocated, so they can be freed */
ast_free(pvt->lpc10.enc);
}
| static int lpc10_enc_new | ( | struct ast_trans_pvt * | pvt | ) | [static] |
Definition at line 68 of file codec_lpc10.c.
References lpc10_coder_pvt::enc, lpc10_coder_pvt::lpc10, and ast_trans_pvt::pvt.
{
struct lpc10_coder_pvt *tmp = pvt->pvt;
return (tmp->lpc10.enc = create_lpc10_encoder_state()) ? 0 : -1;
}
| static int lpc10tolin_framein | ( | struct ast_trans_pvt * | pvt, |
| struct ast_frame * | f | ||
| ) | [static] |
Definition at line 113 of file codec_lpc10.c.
References ast_log(), BUFFER_SAMPLES, ast_frame::data, ast_trans_pvt::datalen, ast_frame::datalen, lpc10_coder_pvt::dec, extract_bits(), ast_trans_pvt::i16, len(), LOG_WARNING, lpc10_coder_pvt::lpc10, LPC10_BYTES_IN_COMPRESSED_FRAME, ast_trans_pvt::outbuf, ast_frame::ptr, ast_trans_pvt::pvt, and ast_trans_pvt::samples.
{
struct lpc10_coder_pvt *tmp = pvt->pvt;
int16_t *dst = pvt->outbuf.i16;
int len = 0;
while (len + LPC10_BYTES_IN_COMPRESSED_FRAME <= f->datalen) {
int x;
float tmpbuf[LPC10_SAMPLES_PER_FRAME];
INT32 bits[LPC10_BITS_IN_COMPRESSED_FRAME]; /* XXX see note */
if (pvt->samples + LPC10_SAMPLES_PER_FRAME > BUFFER_SAMPLES) {
ast_log(LOG_WARNING, "Out of buffer space\n");
return -1;
}
extract_bits(bits, f->data.ptr + len);
if (lpc10_decode(bits, tmpbuf, tmp->lpc10.dec)) {
ast_log(LOG_WARNING, "Invalid lpc10 data\n");
return -1;
}
for (x=0;x<LPC10_SAMPLES_PER_FRAME;x++) {
/* Convert to a short between -1.0 and 1.0 */
dst[pvt->samples + x] = (int16_t)(32768.0 * tmpbuf[x]);
}
pvt->samples += LPC10_SAMPLES_PER_FRAME;
pvt->datalen += 2*LPC10_SAMPLES_PER_FRAME;
len += LPC10_BYTES_IN_COMPRESSED_FRAME;
}
if (len != f->datalen)
printf("Decoded %d, expected %d\n", len, f->datalen);
return 0;
}
| static int reload | ( | void | ) | [static] |
Definition at line 225 of file codec_lpc10.c.
References AST_MODULE_LOAD_SUCCESS.
{
return AST_MODULE_LOAD_SUCCESS;
}
| static int unload_module | ( | void | ) | [static] |
Definition at line 231 of file codec_lpc10.c.
References ast_unregister_translator().
{
int res;
res = ast_unregister_translator(&lintolpc10);
res |= ast_unregister_translator(&lpc10tolin);
return res;
}
Variable Documentation
struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "LPC10 2.4kbps Coder/Decoder" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .reload = reload, } [static] |
Definition at line 259 of file codec_lpc10.c.
struct ast_module_info* ast_module_info = &__mod_info [static] |
Definition at line 259 of file codec_lpc10.c.
struct ast_translator lintolpc10 [static] |
Definition at line 211 of file codec_lpc10.c.
struct ast_translator lpc10tolin [static] |
Definition at line 198 of file codec_lpc10.c.
