Wed Apr 6 11:29:49 2011

Asterisk developer's documentation


app_ices.c File Reference

Stream to an icecast server via ICES (see contrib/asterisk-ices.xml). More...

#include "asterisk.h"
#include <signal.h>
#include <fcntl.h>
#include <sys/time.h>
#include "asterisk/paths.h"
#include "asterisk/lock.h"
#include "asterisk/file.h"
#include "asterisk/channel.h"
#include "asterisk/frame.h"
#include "asterisk/pbx.h"
#include "asterisk/module.h"
#include "asterisk/translate.h"
#include "asterisk/app.h"

Go to the source code of this file.

Defines

#define path_BIN   "/usr/bin/"
#define path_LOCAL   "/usr/local/bin/"

Functions

static void __reg_module (void)
static void __unreg_module (void)
static int ices_exec (struct ast_channel *chan, const char *data)
static int icesencode (char *filename, int fd)
static int load_module (void)
static int unload_module (void)

Variables

static struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Encode and Stream via icecast and ices" , .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 = "8586c2a7d357cb591cc3a6607a8f62d1" , .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_DEFAULT, }
static char * app = "ICES"
static struct ast_module_infoast_module_info = &__mod_info


Detailed Description

Stream to an icecast server via ICES (see contrib/asterisk-ices.xml).

Author:
Mark Spencer <markster@digium.com>
ExtRef:
ICES - http://www.icecast.org/ices.php

Definition in file app_ices.c.


Define Documentation

#define path_BIN   "/usr/bin/"

Definition at line 67 of file app_ices.c.

Referenced by icesencode().

#define path_LOCAL   "/usr/local/bin/"

Definition at line 68 of file app_ices.c.

Referenced by icesencode().


Function Documentation

static void __reg_module ( void   )  [static]

Definition at line 214 of file app_ices.c.

static void __unreg_module ( void   )  [static]

Definition at line 214 of file app_ices.c.

static int ices_exec ( struct ast_channel chan,
const char *  data 
) [static]

Definition at line 107 of file app_ices.c.

References ast_channel::_state, ast_answer(), ast_config_AST_CONFIG_DIR, ast_copy_string(), ast_debug, AST_FORMAT_SLINEAR, AST_FRAME_VOICE, ast_frfree, ast_log(), ast_read(), ast_set_read_format(), AST_STATE_UP, ast_stopstream(), ast_strlen_zero(), ast_tv(), ast_waitfor(), errno, f, ast_flags::flags, icesencode(), LOG_WARNING, and ast_channel::readformat.

Referenced by load_module().

00108 {
00109    int res = 0;
00110    int fds[2];
00111    int ms = -1;
00112    int pid = -1;
00113    int flags;
00114    int oreadformat;
00115    struct timeval last;
00116    struct ast_frame *f;
00117    char filename[256]="";
00118    char *c;
00119 
00120    if (ast_strlen_zero(data)) {
00121       ast_log(LOG_WARNING, "ICES requires an argument (configfile.xml)\n");
00122       return -1;
00123    }
00124    
00125    last = ast_tv(0, 0);
00126    
00127    if (pipe(fds)) {
00128       ast_log(LOG_WARNING, "Unable to create pipe\n");
00129       return -1;
00130    }
00131    flags = fcntl(fds[1], F_GETFL);
00132    fcntl(fds[1], F_SETFL, flags | O_NONBLOCK);
00133    
00134    ast_stopstream(chan);
00135 
00136    if (chan->_state != AST_STATE_UP)
00137       res = ast_answer(chan);
00138       
00139    if (res) {
00140       close(fds[0]);
00141       close(fds[1]);
00142       ast_log(LOG_WARNING, "Answer failed!\n");
00143       return -1;
00144    }
00145 
00146    oreadformat = chan->readformat;
00147    res = ast_set_read_format(chan, AST_FORMAT_SLINEAR);
00148    if (res < 0) {
00149       close(fds[0]);
00150       close(fds[1]);
00151       ast_log(LOG_WARNING, "Unable to set write format to signed linear\n");
00152       return -1;
00153    }
00154    if (((char *)data)[0] == '/')
00155       ast_copy_string(filename, (char *) data, sizeof(filename));
00156    else
00157       snprintf(filename, sizeof(filename), "%s/%s", ast_config_AST_CONFIG_DIR, (char *)data);
00158    /* Placeholder for options */    
00159    c = strchr(filename, '|');
00160    if (c)
00161       *c = '\0';  
00162    res = icesencode(filename, fds[0]);
00163    if (res >= 0) {
00164       pid = res;
00165       for (;;) {
00166          /* Wait for audio, and stream */
00167          ms = ast_waitfor(chan, -1);
00168          if (ms < 0) {
00169             ast_debug(1, "Hangup detected\n");
00170             res = -1;
00171             break;
00172          }
00173          f = ast_read(chan);
00174          if (!f) {
00175             ast_debug(1, "Null frame == hangup() detected\n");
00176             res = -1;
00177             break;
00178          }
00179          if (f->frametype == AST_FRAME_VOICE) {
00180             res = write(fds[1], f->data.ptr, f->datalen);
00181             if (res < 0) {
00182                if (errno != EAGAIN) {
00183                   ast_log(LOG_WARNING, "Write failed to pipe: %s\n", strerror(errno));
00184                   res = -1;
00185                   ast_frfree(f);
00186                   break;
00187                }
00188             }
00189          }
00190          ast_frfree(f);
00191       }
00192    }
00193    close(fds[0]);
00194    close(fds[1]);
00195 
00196    if (pid > -1)
00197       kill(pid, SIGKILL);
00198    if (!res && oreadformat)
00199       ast_set_read_format(chan, oreadformat);
00200 
00201    return res;
00202 }

static int icesencode ( char *  filename,
int  fd 
) [static]

Definition at line 72 of file app_ices.c.

References ast_close_fds_above_n(), ast_debug, ast_log(), ast_opt_high_priority, ast_safe_fork(), ast_set_priority(), LOG_WARNING, path_BIN, path_LOCAL, and SENTINEL.

Referenced by ices_exec().

00073 {
00074    int res;
00075 
00076    res = ast_safe_fork(0);
00077    if (res < 0) 
00078       ast_log(LOG_WARNING, "Fork failed\n");
00079    if (res) {
00080       return res;
00081    }
00082 
00083    if (ast_opt_high_priority)
00084       ast_set_priority(0);
00085    dup2(fd, STDIN_FILENO);
00086    ast_close_fds_above_n(STDERR_FILENO);
00087 
00088    /* Most commonly installed in /usr/local/bin 
00089     * But many places has it in /usr/bin 
00090     * As a last-ditch effort, try to use PATH
00091     */
00092    execl(path_LOCAL "ices2", "ices", filename, SENTINEL);
00093    execl(path_BIN "ices2", "ices", filename, SENTINEL);
00094    execlp("ices2", "ices", filename, SENTINEL);
00095 
00096    ast_debug(1, "Couldn't find ices version 2, attempting to use ices version 1.");
00097 
00098    execl(path_LOCAL "ices", "ices", filename, SENTINEL);
00099    execl(path_BIN "ices", "ices", filename, SENTINEL);
00100    execlp("ices", "ices", filename, SENTINEL);
00101 
00102    ast_log(LOG_WARNING, "Execute of ices failed, could not find command.\n");
00103    close(fd);
00104    _exit(0);
00105 }

static int load_module ( void   )  [static]

Definition at line 209 of file app_ices.c.

References ast_register_application_xml, and ices_exec().

00210 {
00211    return ast_register_application_xml(app, ices_exec);
00212 }

static int unload_module ( void   )  [static]

Definition at line 204 of file app_ices.c.

References ast_unregister_application().

00205 {
00206    return ast_unregister_application(app);
00207 }


Variable Documentation

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Encode and Stream via icecast and ices" , .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 = "8586c2a7d357cb591cc3a6607a8f62d1" , .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_DEFAULT, } [static]

Definition at line 214 of file app_ices.c.

char* app = "ICES" [static]

Definition at line 70 of file app_ices.c.

struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 214 of file app_ices.c.


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