#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 = "88eaa8f5c1bd988bedd71113385e0886" , .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 |
Definition in file codec_lpc10.c.
#define BUFFER_SAMPLES 8000 |
Definition at line 56 of file codec_lpc10.c.
#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().
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().
00097 { 00098 unsigned char mask=0x80; 00099 int x; 00100 *c = 0; 00101 for (x=0;x<LPC10_BITS_IN_COMPRESSED_FRAME;x++) { 00102 if (bits[x]) 00103 *c |= mask; 00104 mask = mask >> 1; 00105 if ((x % 8)==7) { 00106 c++; 00107 *c = 0; 00108 mask = 0x80; 00109 } 00110 } 00111 }
static void extract_bits | ( | INT32 * | bits, | |
unsigned char * | c | |||
) | [static] |
Definition at line 82 of file codec_lpc10.c.
Referenced by lpc10tolin_framein().
00083 { 00084 int x; 00085 for (x=0;x<LPC10_BITS_IN_COMPRESSED_FRAME;x++) { 00086 if (*c & (0x80 >> (x & 7))) 00087 bits[x] = 1; 00088 else 00089 bits[x] = 0; 00090 if ((x & 7) == 7) 00091 c++; 00092 } 00093 }
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, f, LOG_WARNING, ast_trans_pvt::pvt, and ast_trans_pvt::samples.
00147 { 00148 struct lpc10_coder_pvt *tmp = pvt->pvt; 00149 00150 /* Just add the frames to our stream */ 00151 if (pvt->samples + f->samples > BUFFER_SAMPLES) { 00152 ast_log(LOG_WARNING, "Out of buffer space\n"); 00153 return -1; 00154 } 00155 memcpy(tmp->buf + pvt->samples, f->data.ptr, f->datalen); 00156 pvt->samples += f->samples; 00157 return 0; 00158 }
static struct ast_frame* lintolpc10_frameout | ( | struct ast_trans_pvt * | pvt | ) | [static] |
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.
00161 { 00162 struct lpc10_coder_pvt *tmp = pvt->pvt; 00163 int x; 00164 int datalen = 0; /* output frame */ 00165 int samples = 0; /* output samples */ 00166 float tmpbuf[LPC10_SAMPLES_PER_FRAME]; 00167 INT32 bits[LPC10_BITS_IN_COMPRESSED_FRAME]; /* XXX what ??? */ 00168 /* We can't work on anything less than a frame in size */ 00169 if (pvt->samples < LPC10_SAMPLES_PER_FRAME) 00170 return NULL; 00171 while (pvt->samples >= LPC10_SAMPLES_PER_FRAME) { 00172 /* Encode a frame of data */ 00173 for (x=0;x<LPC10_SAMPLES_PER_FRAME;x++) 00174 tmpbuf[x] = (float)tmp->buf[x + samples] / 32768.0; 00175 lpc10_encode(tmpbuf, bits, tmp->lpc10.enc); 00176 build_bits(pvt->outbuf.uc + datalen, bits); 00177 datalen += LPC10_BYTES_IN_COMPRESSED_FRAME; 00178 samples += LPC10_SAMPLES_PER_FRAME; 00179 pvt->samples -= LPC10_SAMPLES_PER_FRAME; 00180 /* Use one of the two left over bits to record if this is a 22 or 23 ms frame... 00181 important for IAX use */ 00182 tmp->longer = 1 - tmp->longer; 00183 } 00184 /* Move the data at the end of the buffer to the front */ 00185 if (pvt->samples) 00186 memmove(tmp->buf, tmp->buf + samples, pvt->samples * 2); 00187 return ast_trans_frameout(pvt, datalen, samples); 00188 }
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, ast_unregister_translator(), lintolpc10, and lpc10tolin.
00242 { 00243 int res; 00244 00245 res = ast_register_translator(&lpc10tolin); 00246 if (!res) 00247 res = ast_register_translator(&lintolpc10); 00248 else 00249 ast_unregister_translator(&lpc10tolin); 00250 if (res) 00251 return AST_MODULE_LOAD_FAILURE; 00252 return AST_MODULE_LOAD_SUCCESS; 00253 }
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.
00076 { 00077 struct lpc10_coder_pvt *tmp = pvt->pvt; 00078 00079 return (tmp->lpc10.dec = create_lpc10_decoder_state()) ? 0 : -1; 00080 }
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.
00192 { 00193 struct lpc10_coder_pvt *pvt = arg->pvt; 00194 /* Enc and DEC are both just allocated, so they can be freed */ 00195 ast_free(pvt->lpc10.enc); 00196 }
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.
00069 { 00070 struct lpc10_coder_pvt *tmp = pvt->pvt; 00071 00072 return (tmp->lpc10.enc = create_lpc10_encoder_state()) ? 0 : -1; 00073 }
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_trans_pvt::datalen, lpc10_coder_pvt::dec, extract_bits(), f, ast_trans_pvt::i16, len(), LOG_WARNING, lpc10_coder_pvt::lpc10, LPC10_BYTES_IN_COMPRESSED_FRAME, ast_trans_pvt::outbuf, ast_trans_pvt::pvt, and ast_trans_pvt::samples.
00114 { 00115 struct lpc10_coder_pvt *tmp = pvt->pvt; 00116 int16_t *dst = pvt->outbuf.i16; 00117 int len = 0; 00118 00119 while (len + LPC10_BYTES_IN_COMPRESSED_FRAME <= f->datalen) { 00120 int x; 00121 float tmpbuf[LPC10_SAMPLES_PER_FRAME]; 00122 INT32 bits[LPC10_BITS_IN_COMPRESSED_FRAME]; /* XXX see note */ 00123 if (pvt->samples + LPC10_SAMPLES_PER_FRAME > BUFFER_SAMPLES) { 00124 ast_log(LOG_WARNING, "Out of buffer space\n"); 00125 return -1; 00126 } 00127 extract_bits(bits, f->data.ptr + len); 00128 if (lpc10_decode(bits, tmpbuf, tmp->lpc10.dec)) { 00129 ast_log(LOG_WARNING, "Invalid lpc10 data\n"); 00130 return -1; 00131 } 00132 for (x=0;x<LPC10_SAMPLES_PER_FRAME;x++) { 00133 /* Convert to a short between -1.0 and 1.0 */ 00134 dst[pvt->samples + x] = (int16_t)(32768.0 * tmpbuf[x]); 00135 } 00136 00137 pvt->samples += LPC10_SAMPLES_PER_FRAME; 00138 pvt->datalen += 2*LPC10_SAMPLES_PER_FRAME; 00139 len += LPC10_BYTES_IN_COMPRESSED_FRAME; 00140 } 00141 if (len != f->datalen) 00142 printf("Decoded %d, expected %d\n", len, f->datalen); 00143 return 0; 00144 }
static int reload | ( | void | ) | [static] |
Definition at line 225 of file codec_lpc10.c.
References AST_MODULE_LOAD_SUCCESS.
00226 { 00227 return AST_MODULE_LOAD_SUCCESS; 00228 }
static int unload_module | ( | void | ) | [static] |
Definition at line 231 of file codec_lpc10.c.
References ast_unregister_translator(), lintolpc10, and lpc10tolin.
00232 { 00233 int res; 00234 00235 res = ast_unregister_translator(&lintolpc10); 00236 res |= ast_unregister_translator(&lpc10tolin); 00237 00238 return res; 00239 }
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 = "88eaa8f5c1bd988bedd71113385e0886" , .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] |
struct ast_translator lpc10tolin [static] |