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00030 #include "asterisk.h"
00031
00032 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
00033
00034 #include <fcntl.h>
00035 #include <netinet/in.h>
00036 #include <stdio.h>
00037 #include <stdlib.h>
00038 #include <string.h>
00039 #include <unistd.h>
00040
00041 #include <spandsp/bit_operations.h>
00042 #include <spandsp/g711.h>
00043
00044 #include "asterisk/lock.h"
00045 #include "asterisk/logger.h"
00046 #include "asterisk/module.h"
00047 #include "asterisk/config.h"
00048 #include "asterisk/options.h"
00049 #include "asterisk/translate.h"
00050 #include "asterisk/channel.h"
00051 #include "asterisk/ulaw.h"
00052 #include "asterisk/utils.h"
00053
00054 #define BUFFER_SAMPLES 8096
00055
00056
00057
00058 #include "slin_ulaw_ex.h"
00059 #include "ulaw_slin_ex.h"
00060
00061
00062 static int ulawtolin_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
00063 {
00064 int i = f->samples;
00065 unsigned char *src = f->data;
00066 int16_t *dst = (int16_t *)pvt->outbuf + pvt->samples;
00067
00068 pvt->samples += i;
00069 pvt->datalen += i * 2;
00070
00071
00072 while (i--)
00073 *dst++ = ulaw_to_linear(*src++);
00074
00075 return 0;
00076 }
00077
00078
00079 static int lintoulaw_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
00080 {
00081 int i = f->samples;
00082 char *dst = pvt->outbuf + pvt->samples;
00083 int16_t *src = f->data;
00084
00085 pvt->samples += i;
00086 pvt->datalen += i;
00087
00088 while (i--)
00089 *dst++ = linear_to_ulaw(*src++);
00090
00091 return 0;
00092 }
00093
00094
00095 static struct ast_frame *ulawtolin_sample(void)
00096 {
00097 static struct ast_frame f;
00098 f.frametype = AST_FRAME_VOICE;
00099 f.subclass = AST_FORMAT_ULAW;
00100 f.datalen = sizeof(ulaw_slin_ex);
00101 f.samples = sizeof(ulaw_slin_ex);
00102 f.mallocd = 0;
00103 f.offset = 0;
00104 f.src = __PRETTY_FUNCTION__;
00105 f.data = ulaw_slin_ex;
00106 return &f;
00107 }
00108
00109
00110
00111
00112
00113 static struct ast_frame *lintoulaw_sample(void)
00114 {
00115 static struct ast_frame f;
00116 f.frametype = AST_FRAME_VOICE;
00117 f.subclass = AST_FORMAT_SLINEAR;
00118 f.datalen = sizeof(slin_ulaw_ex);
00119
00120 f.samples = sizeof(slin_ulaw_ex) / 2;
00121 f.mallocd = 0;
00122 f.offset = 0;
00123 f.src = __PRETTY_FUNCTION__;
00124 f.data = slin_ulaw_ex;
00125 return &f;
00126 }
00127
00128
00129
00130
00131
00132 static struct ast_translator ulawtolin = {
00133 .name = "ulawtolin",
00134 .srcfmt = AST_FORMAT_ULAW,
00135 .dstfmt = AST_FORMAT_SLINEAR,
00136 .framein = ulawtolin_framein,
00137 .sample = ulawtolin_sample,
00138 .buffer_samples = BUFFER_SAMPLES,
00139 .buf_size = BUFFER_SAMPLES * 2,
00140 .plc_samples = 160,
00141 };
00142
00143
00144
00145
00146
00147 static struct ast_translator lintoulaw = {
00148 .name = "lintoulaw",
00149 .srcfmt = AST_FORMAT_SLINEAR,
00150 .dstfmt = AST_FORMAT_ULAW,
00151 .framein = lintoulaw_framein,
00152 .sample = lintoulaw_sample,
00153 .buf_size = BUFFER_SAMPLES,
00154 .buffer_samples = BUFFER_SAMPLES,
00155 };
00156
00157 static void parse_config(void)
00158 {
00159 struct ast_variable *var;
00160 struct ast_config *cfg = ast_config_load("codecs.conf");
00161 if (!cfg)
00162 return;
00163 for (var = ast_variable_browse(cfg, "plc"); var; var = var->next) {
00164 if (!strcasecmp(var->name, "genericplc")) {
00165 ulawtolin.useplc = ast_true(var->value) ? 1 : 0;
00166 if (option_verbose > 2)
00167 ast_verbose(VERBOSE_PREFIX_3 "codec_ulaw: %susing generic PLC\n", ulawtolin.useplc ? "" : "not ");
00168 }
00169 }
00170 ast_config_destroy(cfg);
00171 }
00172
00173 static int reload(void)
00174 {
00175 parse_config();
00176
00177 return 0;
00178 }
00179
00180 static int unload_module(void)
00181 {
00182 int res;
00183
00184 res = ast_unregister_translator(&lintoulaw);
00185 res |= ast_unregister_translator(&ulawtolin);
00186
00187 return res;
00188 }
00189
00190 static int load_module(void)
00191 {
00192 int res;
00193
00194 parse_config();
00195 res = ast_register_translator(&ulawtolin);
00196 if (!res)
00197 res = ast_register_translator(&lintoulaw);
00198 else
00199 ast_unregister_translator(&ulawtolin);
00200
00201 return res;
00202 }
00203
00204 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "mu-Law Coder/Decoder",
00205 .load = load_module,
00206 .unload = unload_module,
00207 .reload = reload,
00208 );