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00026 #include "asterisk.h"
00027
00028 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 267539 $")
00029
00030 #include <fcntl.h>
00031 #include <netinet/in.h>
00032 #include <stdio.h>
00033 #include <stdlib.h>
00034 #include <string.h>
00035 #include <unistd.h>
00036
00037 #include "asterisk/lock.h"
00038 #include "asterisk/logger.h"
00039 #include "asterisk/module.h"
00040 #include "asterisk/config.h"
00041 #include "asterisk/options.h"
00042 #include "asterisk/translate.h"
00043 #include "asterisk/channel.h"
00044 #include "asterisk/ulaw.h"
00045 #include "asterisk/utils.h"
00046
00047 #define BUFFER_SAMPLES 8096
00048
00049
00050
00051 #include "slin_ulaw_ex.h"
00052 #include "ulaw_slin_ex.h"
00053
00054
00055 static int ulawtolin_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
00056 {
00057 int i = f->samples;
00058 unsigned char *src = f->data;
00059 int16_t *dst = (int16_t *)pvt->outbuf + pvt->samples;
00060
00061 pvt->samples += i;
00062 pvt->datalen += i * 2;
00063
00064
00065 while (i--)
00066 *dst++ = AST_MULAW(*src++);
00067
00068 return 0;
00069 }
00070
00071
00072 static int lintoulaw_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
00073 {
00074 int i = f->samples;
00075 char *dst = pvt->outbuf + pvt->samples;
00076 int16_t *src = f->data;
00077
00078 pvt->samples += i;
00079 pvt->datalen += i;
00080
00081 while (i--)
00082 *dst++ = AST_LIN2MU(*src++);
00083
00084 return 0;
00085 }
00086
00087
00088 static struct ast_frame *ulawtolin_sample(void)
00089 {
00090 static struct ast_frame f;
00091 f.frametype = AST_FRAME_VOICE;
00092 f.subclass = AST_FORMAT_ULAW;
00093 f.datalen = sizeof(ulaw_slin_ex);
00094 f.samples = sizeof(ulaw_slin_ex);
00095 f.mallocd = 0;
00096 f.offset = 0;
00097 f.src = __PRETTY_FUNCTION__;
00098 f.data = ulaw_slin_ex;
00099 return &f;
00100 }
00101
00102
00103
00104
00105
00106 static struct ast_frame *lintoulaw_sample(void)
00107 {
00108 static struct ast_frame f;
00109 f.frametype = AST_FRAME_VOICE;
00110 f.subclass = AST_FORMAT_SLINEAR;
00111 f.datalen = sizeof(slin_ulaw_ex);
00112
00113 f.samples = sizeof(slin_ulaw_ex) / 2;
00114 f.mallocd = 0;
00115 f.offset = 0;
00116 f.src = __PRETTY_FUNCTION__;
00117 f.data = slin_ulaw_ex;
00118 return &f;
00119 }
00120
00121
00122
00123
00124
00125 static struct ast_translator ulawtolin = {
00126 .name = "ulawtolin",
00127 .srcfmt = AST_FORMAT_ULAW,
00128 .dstfmt = AST_FORMAT_SLINEAR,
00129 .framein = ulawtolin_framein,
00130 .sample = ulawtolin_sample,
00131 .buffer_samples = BUFFER_SAMPLES,
00132 .buf_size = BUFFER_SAMPLES * 2,
00133 };
00134
00135
00136
00137
00138
00139 static struct ast_translator lintoulaw = {
00140 .name = "lintoulaw",
00141 .srcfmt = AST_FORMAT_SLINEAR,
00142 .dstfmt = AST_FORMAT_ULAW,
00143 .framein = lintoulaw_framein,
00144 .sample = lintoulaw_sample,
00145 .buf_size = BUFFER_SAMPLES,
00146 .buffer_samples = BUFFER_SAMPLES,
00147 };
00148
00149 static int reload(void)
00150 {
00151 return 0;
00152 }
00153
00154 static int unload_module(void)
00155 {
00156 int res;
00157
00158 res = ast_unregister_translator(&lintoulaw);
00159 res |= ast_unregister_translator(&ulawtolin);
00160
00161 return res;
00162 }
00163
00164 static int load_module(void)
00165 {
00166 int res;
00167
00168 res = ast_register_translator(&ulawtolin);
00169 if (!res)
00170 res = ast_register_translator(&lintoulaw);
00171 else
00172 ast_unregister_translator(&ulawtolin);
00173
00174 return res;
00175 }
00176
00177 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "mu-Law Coder/Decoder",
00178 .load = load_module,
00179 .unload = unload_module,
00180 .reload = reload,
00181 );