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00028 #include "asterisk.h"
00029
00030 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 239714 $")
00031
00032 #include "asterisk/file.h"
00033 #include "asterisk/channel.h"
00034 #include "asterisk/pbx.h"
00035 #include "asterisk/module.h"
00036 #include "asterisk/lock.h"
00037
00038 static char *synopsis = "Wait for Ring Application";
00039
00040 static char *desc = " WaitForRing(timeout):\n"
00041 "Returns 0 after waiting at least timeout seconds. and\n"
00042 "only after the next ring has completed. Returns 0 on\n"
00043 "success or -1 on hangup\n";
00044
00045 static char *app = "WaitForRing";
00046
00047
00048 static int waitforring_exec(struct ast_channel *chan, void *data)
00049 {
00050 struct ast_frame *f;
00051 struct ast_silence_generator *silgen = NULL;
00052 int res = 0;
00053 double s;
00054 int ms;
00055
00056 if (!data || (sscanf(data, "%30lg", &s) != 1)) {
00057 ast_log(LOG_WARNING, "WaitForRing requires an argument (minimum seconds)\n");
00058 return 0;
00059 }
00060
00061 if (ast_opt_transmit_silence) {
00062 silgen = ast_channel_start_silence_generator(chan);
00063 }
00064
00065 ms = s * 1000.0;
00066 while (ms > 0) {
00067 ms = ast_waitfor(chan, ms);
00068 if (ms < 0) {
00069 res = ms;
00070 break;
00071 }
00072 if (ms > 0) {
00073 f = ast_read(chan);
00074 if (!f) {
00075 res = -1;
00076 break;
00077 }
00078 if ((f->frametype == AST_FRAME_CONTROL) && (f->subclass == AST_CONTROL_RING)) {
00079 ast_verb(3, "Got a ring but still waiting for timeout\n");
00080 }
00081 ast_frfree(f);
00082 }
00083 }
00084
00085 if (!res) {
00086 ms = 99999999;
00087 while(ms > 0) {
00088 ms = ast_waitfor(chan, ms);
00089 if (ms < 0) {
00090 res = ms;
00091 break;
00092 }
00093 if (ms > 0) {
00094 f = ast_read(chan);
00095 if (!f) {
00096 res = -1;
00097 break;
00098 }
00099 if ((f->frametype == AST_FRAME_CONTROL) && (f->subclass == AST_CONTROL_RING)) {
00100 ast_verb(3, "Got a ring after the timeout\n");
00101 ast_frfree(f);
00102 break;
00103 }
00104 ast_frfree(f);
00105 }
00106 }
00107 }
00108
00109 if (silgen) {
00110 ast_channel_stop_silence_generator(chan, silgen);
00111 }
00112
00113 return res;
00114 }
00115
00116 static int unload_module(void)
00117 {
00118 return ast_unregister_application(app);
00119 }
00120
00121 static int load_module(void)
00122 {
00123 return ast_register_application(app, waitforring_exec, synopsis, desc);
00124 }
00125
00126 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Waits until first ring after time");