Wed Aug 18 22:33:59 2010

Asterisk developer's documentation


app_milliwatt.c File Reference

Digital Milliwatt Test. More...

#include "asterisk.h"
#include "asterisk/module.h"
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/indications.h"

Go to the source code of this file.

Functions

static void __reg_module (void)
static void __unreg_module (void)
static int load_module (void)
static void * milliwatt_alloc (struct ast_channel *chan, void *params)
static int milliwatt_exec (struct ast_channel *chan, void *data)
static int milliwatt_generate (struct ast_channel *chan, void *data, int len, int samples)
static void milliwatt_release (struct ast_channel *chan, void *data)
static int old_milliwatt_exec (struct ast_channel *chan)
static int unload_module (void)

Variables

static struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "Digital Milliwatt (mu-law) Test Application" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = "a9c98e5d177805051735cb5b0b16b0a0" , .load = load_module, .unload = unload_module, }
static char * app = "Milliwatt"
static struct ast_module_infoast_module_info = &__mod_info
static char * descrip
static char digital_milliwatt [] = {0x1e,0x0b,0x0b,0x1e,0x9e,0x8b,0x8b,0x9e}
static struct ast_generator milliwattgen
static char * synopsis = "Generate a Constant 1004Hz tone at 0dbm (mu-law)"


Detailed Description

Digital Milliwatt Test.

Author:
Mark Spencer <markster@digium.com>

Definition in file app_milliwatt.c.


Function Documentation

static void __reg_module ( void   )  [static]

Definition at line 162 of file app_milliwatt.c.

static void __unreg_module ( void   )  [static]

Definition at line 162 of file app_milliwatt.c.

static int load_module ( void   )  [static]

Definition at line 157 of file app_milliwatt.c.

References ast_register_application, and milliwatt_exec().

00158 {
00159    return ast_register_application(app, milliwatt_exec, synopsis, descrip);
00160 }

static void* milliwatt_alloc ( struct ast_channel chan,
void *  params 
) [static]

Definition at line 54 of file app_milliwatt.c.

References ast_calloc.

00055 {
00056    return ast_calloc(1, sizeof(int));
00057 }

static int milliwatt_exec ( struct ast_channel chan,
void *  data 
) [static]

Definition at line 134 of file app_milliwatt.c.

References ast_playtones_start(), ast_safe_sleep(), ast_strlen_zero(), chan, and old_milliwatt_exec().

Referenced by load_module().

00135 {
00136    const char *options = data;
00137    int res = -1;
00138 
00139    if (!ast_strlen_zero(options) && strchr(options, 'o')) {
00140       return old_milliwatt_exec(chan);
00141    }
00142 
00143    res = ast_playtones_start(chan, 23255, "1004/1000", 0);
00144 
00145    while (!res) {
00146       res = ast_safe_sleep(chan, 10000);
00147    }
00148 
00149    return res;
00150 }

static int milliwatt_generate ( struct ast_channel chan,
void *  data,
int  len,
int  samples 
) [static]

Definition at line 65 of file app_milliwatt.c.

References ARRAY_LEN, AST_FORMAT_ULAW, AST_FRAME_VOICE, AST_FRIENDLY_OFFSET, ast_log(), ast_write(), buf, chan, ast_frame::data, ast_frame::datalen, errno, ast_frame::frametype, LOG_WARNING, ast_channel::name, ast_frame::ptr, and ast_frame::samples.

00066 {
00067    unsigned char buf[AST_FRIENDLY_OFFSET + 640];
00068    const int maxsamples = ARRAY_LEN(buf);
00069    int i, *indexp = (int *) data;
00070    struct ast_frame wf = {
00071       .frametype = AST_FRAME_VOICE,
00072       .subclass = AST_FORMAT_ULAW,
00073       .offset = AST_FRIENDLY_OFFSET,
00074       .src = __FUNCTION__,
00075    };
00076    wf.data.ptr = buf + AST_FRIENDLY_OFFSET;
00077 
00078    /* Instead of len, use samples, because channel.c generator_force
00079    * generate(chan, tmp, 0, 160) ignores len. In any case, len is
00080    * a multiple of samples, given by number of samples times bytes per
00081    * sample. In the case of ulaw, len = samples. for signed linear
00082    * len = 2 * samples */
00083    if (samples > maxsamples) {
00084       ast_log(LOG_WARNING, "Only doing %d samples (%d requested)\n", maxsamples, samples);
00085       samples = maxsamples;
00086    }
00087 
00088    len = samples * sizeof (buf[0]);
00089    wf.datalen = len;
00090    wf.samples = samples;
00091 
00092    /* create a buffer containing the digital milliwatt pattern */
00093    for (i = 0; i < len; i++) {
00094       buf[AST_FRIENDLY_OFFSET + i] = digital_milliwatt[(*indexp)++];
00095       *indexp &= 7;
00096    }
00097 
00098    if (ast_write(chan,&wf) < 0) {
00099       ast_log(LOG_WARNING,"Failed to write frame to '%s': %s\n",chan->name,strerror(errno));
00100       return -1;
00101    }
00102 
00103    return 0;
00104 }

static void milliwatt_release ( struct ast_channel chan,
void *  data 
) [static]

Definition at line 59 of file app_milliwatt.c.

References ast_free.

00060 {
00061    ast_free(data);
00062    return;
00063 }

static int old_milliwatt_exec ( struct ast_channel chan  )  [static]

Definition at line 112 of file app_milliwatt.c.

References ast_channel::_state, ast_activate_generator(), ast_answer(), ast_deactivate_generator(), AST_FORMAT_ULAW, ast_log(), ast_safe_sleep(), ast_set_read_format(), ast_set_write_format(), AST_STATE_UP, chan, LOG_WARNING, milliwattgen, and ast_channel::name.

Referenced by milliwatt_exec().

00113 {
00114    ast_set_write_format(chan, AST_FORMAT_ULAW);
00115    ast_set_read_format(chan, AST_FORMAT_ULAW);
00116 
00117    if (chan->_state != AST_STATE_UP) {
00118       ast_answer(chan);
00119    }
00120 
00121    if (ast_activate_generator(chan,&milliwattgen,"milliwatt") < 0) {
00122       ast_log(LOG_WARNING,"Failed to activate generator on '%s'\n",chan->name);
00123       return -1;
00124    }
00125 
00126    while (!ast_safe_sleep(chan, 10000))
00127       ;
00128 
00129    ast_deactivate_generator(chan);
00130 
00131    return -1;
00132 }

static int unload_module ( void   )  [static]

Definition at line 152 of file app_milliwatt.c.

References ast_unregister_application().

00153 {
00154    return ast_unregister_application(app);
00155 }


Variable Documentation

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "Digital Milliwatt (mu-law) Test Application" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = "a9c98e5d177805051735cb5b0b16b0a0" , .load = load_module, .unload = unload_module, } [static]

Definition at line 162 of file app_milliwatt.c.

char* app = "Milliwatt" [static]

Definition at line 41 of file app_milliwatt.c.

struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 162 of file app_milliwatt.c.

char* descrip [static]

Definition at line 45 of file app_milliwatt.c.

char digital_milliwatt[] = {0x1e,0x0b,0x0b,0x1e,0x9e,0x8b,0x8b,0x9e} [static]

Definition at line 52 of file app_milliwatt.c.

struct ast_generator milliwattgen [static]

Initial value:

 {
   alloc: milliwatt_alloc,
   release: milliwatt_release,
   generate: milliwatt_generate,
}

Definition at line 106 of file app_milliwatt.c.

Referenced by old_milliwatt_exec().

char* synopsis = "Generate a Constant 1004Hz tone at 0dbm (mu-law)" [static]

Definition at line 43 of file app_milliwatt.c.


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