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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/alaw.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 alawtolin_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 while (i--)
00072 *dst++ = alaw_to_linear(*src++);
00073
00074 return 0;
00075 }
00076
00077
00078 static int lintoalaw_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
00079 {
00080 int i = f->samples;
00081 char *dst = pvt->outbuf + pvt->samples;
00082 int16_t *src = f->data;
00083
00084 pvt->samples += i;
00085 pvt->datalen += i;
00086
00087 while (i--)
00088 *dst++ = linear_to_alaw(*src++);
00089
00090 return 0;
00091 }
00092
00093
00094 static struct ast_frame *alawtolin_sample(void)
00095 {
00096 static struct ast_frame f;
00097 f.frametype = AST_FRAME_VOICE;
00098 f.subclass = AST_FORMAT_ALAW;
00099 f.datalen = sizeof(ulaw_slin_ex);
00100 f.samples = sizeof(ulaw_slin_ex);
00101 f.mallocd = 0;
00102 f.offset = 0;
00103 f.src = __PRETTY_FUNCTION__;
00104 f.data = ulaw_slin_ex;
00105 return &f;
00106 }
00107
00108
00109 static struct ast_frame *lintoalaw_sample(void)
00110 {
00111 static struct ast_frame f;
00112 f.frametype = AST_FRAME_VOICE;
00113 f.subclass = AST_FORMAT_SLINEAR;
00114 f.datalen = sizeof(slin_ulaw_ex);
00115 f.samples = sizeof(slin_ulaw_ex) / 2;
00116 f.mallocd = 0;
00117 f.offset = 0;
00118 f.src = __PRETTY_FUNCTION__;
00119 f.data = slin_ulaw_ex;
00120 return &f;
00121 }
00122
00123 static struct ast_translator alawtolin = {
00124 .name = "alawtolin",
00125 .srcfmt = AST_FORMAT_ALAW,
00126 .dstfmt = AST_FORMAT_SLINEAR,
00127 .framein = alawtolin_framein,
00128 .sample = alawtolin_sample,
00129 .buffer_samples = BUFFER_SAMPLES,
00130 .buf_size = BUFFER_SAMPLES * 2,
00131 .plc_samples = 160,
00132 };
00133
00134 static struct ast_translator lintoalaw = {
00135 "lintoalaw",
00136 .srcfmt = AST_FORMAT_SLINEAR,
00137 .dstfmt = AST_FORMAT_ALAW,
00138 .framein = lintoalaw_framein,
00139 .sample = lintoalaw_sample,
00140 .buffer_samples = BUFFER_SAMPLES,
00141 .buf_size = BUFFER_SAMPLES,
00142 };
00143
00144 static void parse_config(void)
00145 {
00146 struct ast_variable *var;
00147 struct ast_config *cfg = ast_config_load("codecs.conf");
00148 if (!cfg)
00149 return;
00150 for (var = ast_variable_browse(cfg, "plc"); var; var = var->next) {
00151 if (!strcasecmp(var->name, "genericplc")) {
00152 alawtolin.useplc = ast_true(var->value) ? 1 : 0;
00153 if (option_verbose > 2)
00154 ast_verbose(VERBOSE_PREFIX_3 "codec_alaw: %susing generic PLC\n", alawtolin.useplc ? "" : "not ");
00155 }
00156 }
00157 ast_config_destroy(cfg);
00158 }
00159
00160
00161
00162 static int reload(void)
00163 {
00164 parse_config();
00165 return 0;
00166 }
00167
00168 static int unload_module(void)
00169 {
00170 int res;
00171
00172 res = ast_unregister_translator(&lintoalaw);
00173 res |= ast_unregister_translator(&alawtolin);
00174
00175 return res;
00176 }
00177
00178 static int load_module(void)
00179 {
00180 int res;
00181
00182 parse_config();
00183 res = ast_register_translator(&alawtolin);
00184 if (!res)
00185 res = ast_register_translator(&lintoalaw);
00186 else
00187 ast_unregister_translator(&alawtolin);
00188
00189 return res;
00190 }
00191
00192 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "A-law Coder/Decoder",
00193 .load = load_module,
00194 .unload = unload_module,
00195 .reload = reload,
00196 );