codec_alaw.c
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00030 #include "asterisk.h"
00031
00032 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 328209 $")
00033
00034 #include "asterisk/module.h"
00035 #include "asterisk/config.h"
00036 #include "asterisk/translate.h"
00037 #include "asterisk/alaw.h"
00038 #include "asterisk/utils.h"
00039
00040 #define BUFFER_SAMPLES 8096
00041
00042
00043 #include "asterisk/slin.h"
00044 #include "ex_alaw.h"
00045
00046
00047 static int alawtolin_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
00048 {
00049 int i = f->samples;
00050 unsigned char *src = f->data.ptr;
00051 int16_t *dst = pvt->outbuf.i16 + pvt->samples;
00052
00053 pvt->samples += i;
00054 pvt->datalen += i * 2;
00055
00056 while (i--)
00057 *dst++ = AST_ALAW(*src++);
00058
00059 return 0;
00060 }
00061
00062
00063 static int lintoalaw_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
00064 {
00065 int i = f->samples;
00066 char *dst = pvt->outbuf.c + pvt->samples;
00067 int16_t *src = f->data.ptr;
00068
00069 pvt->samples += i;
00070 pvt->datalen += i;
00071
00072 while (i--)
00073 *dst++ = AST_LIN2A(*src++);
00074
00075 return 0;
00076 }
00077
00078 static struct ast_translator alawtolin = {
00079 .name = "alawtolin",
00080 .srcfmt = AST_FORMAT_ALAW,
00081 .dstfmt = AST_FORMAT_SLINEAR,
00082 .framein = alawtolin_framein,
00083 .sample = alaw_sample,
00084 .buffer_samples = BUFFER_SAMPLES,
00085 .buf_size = BUFFER_SAMPLES * 2,
00086 };
00087
00088 static struct ast_translator lintoalaw = {
00089 "lintoalaw",
00090 .srcfmt = AST_FORMAT_SLINEAR,
00091 .dstfmt = AST_FORMAT_ALAW,
00092 .framein = lintoalaw_framein,
00093 .sample = slin8_sample,
00094 .buffer_samples = BUFFER_SAMPLES,
00095 .buf_size = BUFFER_SAMPLES,
00096 };
00097
00098
00099
00100 static int reload(void)
00101 {
00102 return AST_MODULE_LOAD_SUCCESS;
00103 }
00104
00105 static int unload_module(void)
00106 {
00107 int res;
00108
00109 res = ast_unregister_translator(&lintoalaw);
00110 res |= ast_unregister_translator(&alawtolin);
00111
00112 return res;
00113 }
00114
00115 static int load_module(void)
00116 {
00117 int res;
00118
00119 res = ast_register_translator(&alawtolin);
00120 if (!res)
00121 res = ast_register_translator(&lintoalaw);
00122 else
00123 ast_unregister_translator(&alawtolin);
00124 if (res)
00125 return AST_MODULE_LOAD_FAILURE;
00126 return AST_MODULE_LOAD_SUCCESS;
00127 }
00128
00129 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "A-law Coder/Decoder",
00130 .load = load_module,
00131 .unload = unload_module,
00132 .reload = reload,
00133 );