Mon Aug 31 12:30:15 2015

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

 AST_MODULE_INFO_STANDARD (ASTERISK_GPL_KEY,"Encode and Stream via icecast and ices")
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 char * app = "ICES"

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 71 of file app_ices.c.

Referenced by icesencode().

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

Definition at line 72 of file app_ices.c.

Referenced by icesencode().


Function Documentation

AST_MODULE_INFO_STANDARD ( ASTERISK_GPL_KEY  ,
"Encode and Stream via icecast and ices"   
)
static int ices_exec ( struct ast_channel chan,
const char *  data 
) [static]

Definition at line 111 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_waitfor(), ast_frame::data, ast_frame::datalen, errno, f, ast_flags::flags, ast_frame::frametype, icesencode(), LOG_WARNING, ast_frame::ptr, and ast_channel::readformat.

Referenced by load_module().

00112 {
00113    int res = 0;
00114    int fds[2];
00115    int ms = -1;
00116    int pid = -1;
00117    int flags;
00118    int oreadformat;
00119    struct ast_frame *f;
00120    char filename[256]="";
00121    char *c;
00122 
00123    if (ast_strlen_zero(data)) {
00124       ast_log(LOG_WARNING, "ICES requires an argument (configfile.xml)\n");
00125       return -1;
00126    }
00127    
00128    if (pipe(fds)) {
00129       ast_log(LOG_WARNING, "Unable to create pipe\n");
00130       return -1;
00131    }
00132    flags = fcntl(fds[1], F_GETFL);
00133    fcntl(fds[1], F_SETFL, flags | O_NONBLOCK);
00134    
00135    ast_stopstream(chan);
00136 
00137    if (chan->_state != AST_STATE_UP)
00138       res = ast_answer(chan);
00139       
00140    if (res) {
00141       close(fds[0]);
00142       close(fds[1]);
00143       ast_log(LOG_WARNING, "Answer failed!\n");
00144       return -1;
00145    }
00146 
00147    oreadformat = chan->readformat;
00148    res = ast_set_read_format(chan, AST_FORMAT_SLINEAR);
00149    if (res < 0) {
00150       close(fds[0]);
00151       close(fds[1]);
00152       ast_log(LOG_WARNING, "Unable to set write format to signed linear\n");
00153       return -1;
00154    }
00155    if (((char *)data)[0] == '/')
00156       ast_copy_string(filename, (char *) data, sizeof(filename));
00157    else
00158       snprintf(filename, sizeof(filename), "%s/%s", ast_config_AST_CONFIG_DIR, (char *)data);
00159    /* Placeholder for options */    
00160    c = strchr(filename, '|');
00161    if (c)
00162       *c = '\0';  
00163    res = icesencode(filename, fds[0]);
00164    if (res >= 0) {
00165       pid = res;
00166       for (;;) {
00167          /* Wait for audio, and stream */
00168          ms = ast_waitfor(chan, -1);
00169          if (ms < 0) {
00170             ast_debug(1, "Hangup detected\n");
00171             res = -1;
00172             break;
00173          }
00174          f = ast_read(chan);
00175          if (!f) {
00176             ast_debug(1, "Null frame == hangup() detected\n");
00177             res = -1;
00178             break;
00179          }
00180          if (f->frametype == AST_FRAME_VOICE) {
00181             res = write(fds[1], f->data.ptr, f->datalen);
00182             if (res < 0) {
00183                if (errno != EAGAIN) {
00184                   ast_log(LOG_WARNING, "Write failed to pipe: %s\n", strerror(errno));
00185                   res = -1;
00186                   ast_frfree(f);
00187                   break;
00188                }
00189             }
00190          }
00191          ast_frfree(f);
00192       }
00193    }
00194    close(fds[0]);
00195    close(fds[1]);
00196 
00197    if (pid > -1)
00198       kill(pid, SIGKILL);
00199    if (!res && oreadformat)
00200       ast_set_read_format(chan, oreadformat);
00201 
00202    return res;
00203 }

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

Definition at line 76 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().

00077 {
00078    int res;
00079 
00080    res = ast_safe_fork(0);
00081    if (res < 0) 
00082       ast_log(LOG_WARNING, "Fork failed\n");
00083    if (res) {
00084       return res;
00085    }
00086 
00087    if (ast_opt_high_priority)
00088       ast_set_priority(0);
00089    dup2(fd, STDIN_FILENO);
00090    ast_close_fds_above_n(STDERR_FILENO);
00091 
00092    /* Most commonly installed in /usr/local/bin 
00093     * But many places has it in /usr/bin 
00094     * As a last-ditch effort, try to use PATH
00095     */
00096    execl(path_LOCAL "ices2", "ices", filename, SENTINEL);
00097    execl(path_BIN "ices2", "ices", filename, SENTINEL);
00098    execlp("ices2", "ices", filename, SENTINEL);
00099 
00100    ast_debug(1, "Couldn't find ices version 2, attempting to use ices version 1.\n");
00101 
00102    execl(path_LOCAL "ices", "ices", filename, SENTINEL);
00103    execl(path_BIN "ices", "ices", filename, SENTINEL);
00104    execlp("ices", "ices", filename, SENTINEL);
00105 
00106    ast_log(LOG_WARNING, "Execute of ices failed, could not find command.\n");
00107    close(fd);
00108    _exit(0);
00109 }

static int load_module ( void   )  [static]

Definition at line 210 of file app_ices.c.

References ast_register_application_xml, and ices_exec().

00211 {
00212    return ast_register_application_xml(app, ices_exec);
00213 }

static int unload_module ( void   )  [static]

Definition at line 205 of file app_ices.c.

References ast_unregister_application().

00206 {
00207    return ast_unregister_application(app);
00208 }


Variable Documentation

char* app = "ICES" [static]

Definition at line 74 of file app_ices.c.


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