Mon Oct 8 12:39:02 2012

Asterisk developer's documentation


file.c

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00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * Copyright (C) 1999 - 2006, Digium, Inc.
00005  *
00006  * Mark Spencer <markster@digium.com>
00007  *
00008  * See http://www.asterisk.org for more information about
00009  * the Asterisk project. Please do not directly contact
00010  * any of the maintainers of this project for assistance;
00011  * the project provides a web site, mailing lists and IRC
00012  * channels for your use.
00013  *
00014  * This program is free software, distributed under the terms of
00015  * the GNU General Public License Version 2. See the LICENSE file
00016  * at the top of the source tree.
00017  */
00018 
00019 /*! \file
00020  *
00021  * \brief Generic File Format Support.
00022  *
00023  * \author Mark Spencer <markster@digium.com> 
00024  */
00025 
00026 /*** MODULEINFO
00027    <support_level>core</support_level>
00028  ***/
00029 
00030 #include "asterisk.h"
00031 
00032 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 369001 $")
00033 
00034 #include <dirent.h>
00035 #include <sys/stat.h>
00036 #include <sys/wait.h>
00037 #include <math.h>
00038 
00039 #include "asterisk/_private.h"   /* declare ast_file_init() */
00040 #include "asterisk/paths.h"   /* use ast_config_AST_DATA_DIR */
00041 #include "asterisk/mod_format.h"
00042 #include "asterisk/cli.h"
00043 #include "asterisk/channel.h"
00044 #include "asterisk/sched.h"
00045 #include "asterisk/translate.h"
00046 #include "asterisk/utils.h"
00047 #include "asterisk/lock.h"
00048 #include "asterisk/app.h"
00049 #include "asterisk/pbx.h"
00050 #include "asterisk/linkedlists.h"
00051 #include "asterisk/module.h"
00052 #include "asterisk/astobj2.h"
00053 #include "asterisk/test.h"
00054 
00055 /*
00056  * The following variable controls the layout of localized sound files.
00057  * If 0, use the historical layout with prefix just before the filename
00058  * (i.e. digits/en/1.gsm , digits/it/1.gsm or default to digits/1.gsm),
00059  * if 1 put the prefix at the beginning of the filename
00060  * (i.e. en/digits/1.gsm, it/digits/1.gsm or default to digits/1.gsm).
00061  * The latter permits a language to be entirely in one directory.
00062  */
00063 int ast_language_is_prefix = 1;
00064 
00065 static AST_RWLIST_HEAD_STATIC(formats, ast_format);
00066 
00067 int __ast_format_register(const struct ast_format *f, struct ast_module *mod)
00068 {
00069    struct ast_format *tmp;
00070 
00071    AST_RWLIST_WRLOCK(&formats);
00072    AST_RWLIST_TRAVERSE(&formats, tmp, list) {
00073       if (!strcasecmp(f->name, tmp->name)) {
00074          AST_RWLIST_UNLOCK(&formats);
00075          ast_log(LOG_WARNING, "Tried to register '%s' format, already registered\n", f->name);
00076          return -1;
00077       }
00078    }
00079    if (!(tmp = ast_calloc(1, sizeof(*tmp)))) {
00080       AST_RWLIST_UNLOCK(&formats);
00081       return -1;
00082    }
00083    *tmp = *f;
00084    tmp->module = mod;
00085    if (tmp->buf_size) {
00086       /*
00087        * Align buf_size properly, rounding up to the machine-specific
00088        * alignment for pointers.
00089        */
00090       struct _test_align { void *a, *b; } p;
00091       int align = (char *)&p.b - (char *)&p.a;
00092       tmp->buf_size = ((f->buf_size + align - 1) / align) * align;
00093    }
00094    
00095    memset(&tmp->list, 0, sizeof(tmp->list));
00096 
00097    AST_RWLIST_INSERT_HEAD(&formats, tmp, list);
00098    AST_RWLIST_UNLOCK(&formats);
00099    ast_verb(2, "Registered file format %s, extension(s) %s\n", f->name, f->exts);
00100 
00101    return 0;
00102 }
00103 
00104 int ast_format_unregister(const char *name)
00105 {
00106    struct ast_format *tmp;
00107    int res = -1;
00108 
00109    AST_RWLIST_WRLOCK(&formats);
00110    AST_RWLIST_TRAVERSE_SAFE_BEGIN(&formats, tmp, list) {
00111       if (!strcasecmp(name, tmp->name)) {
00112          AST_RWLIST_REMOVE_CURRENT(list);
00113          ast_free(tmp);
00114          res = 0;
00115       }
00116    }
00117    AST_RWLIST_TRAVERSE_SAFE_END;
00118    AST_RWLIST_UNLOCK(&formats);
00119 
00120    if (!res)
00121       ast_verb(2, "Unregistered format %s\n", name);
00122    else
00123       ast_log(LOG_WARNING, "Tried to unregister format %s, already unregistered\n", name);
00124 
00125    return res;
00126 }
00127 
00128 int ast_stopstream(struct ast_channel *tmp)
00129 {
00130    ast_channel_lock(tmp);
00131 
00132    /* Stop a running stream if there is one */
00133    if (tmp->stream) {
00134       ast_closestream(tmp->stream);
00135       tmp->stream = NULL;
00136       if (tmp->oldwriteformat && ast_set_write_format(tmp, tmp->oldwriteformat))
00137          ast_log(LOG_WARNING, "Unable to restore format back to %s\n", ast_getformatname(tmp->oldwriteformat));
00138    }
00139    /* Stop the video stream too */
00140    if (tmp->vstream != NULL) {
00141       ast_closestream(tmp->vstream);
00142       tmp->vstream = NULL;
00143    }
00144 
00145    ast_channel_unlock(tmp);
00146 
00147    return 0;
00148 }
00149 
00150 int ast_writestream(struct ast_filestream *fs, struct ast_frame *f)
00151 {
00152    int res = -1;
00153    int alt = 0;
00154    if (f->frametype == AST_FRAME_VIDEO) {
00155       if (fs->fmt->format & AST_FORMAT_AUDIO_MASK) {
00156          /* This is the audio portion.  Call the video one... */
00157          if (!fs->vfs && fs->filename) {
00158             const char *type = ast_getformatname(f->subclass.codec & ~0x1);
00159             fs->vfs = ast_writefile(fs->filename, type, NULL, fs->flags, 0, fs->mode);
00160             ast_debug(1, "Opened video output file\n");
00161          }
00162          if (fs->vfs)
00163             return ast_writestream(fs->vfs, f);
00164          /* else ignore */
00165          return 0;            
00166       } else {
00167          /* Might / might not have mark set */
00168          alt = 1;
00169       }
00170    } else if (f->frametype != AST_FRAME_VOICE) {
00171       ast_log(LOG_WARNING, "Tried to write non-voice frame\n");
00172       return -1;
00173    }
00174    if (((fs->fmt->format | alt) & f->subclass.codec) == f->subclass.codec) {
00175       res =  fs->fmt->write(fs, f);
00176       if (res < 0) 
00177          ast_log(LOG_WARNING, "Natural write failed\n");
00178       else if (res > 0)
00179          ast_log(LOG_WARNING, "Huh??\n");
00180    } else {
00181       /* XXX If they try to send us a type of frame that isn't the normal frame, and isn't
00182              the one we've setup a translator for, we do the "wrong thing" XXX */
00183       if (fs->trans && f->subclass.codec != fs->lastwriteformat) {
00184          ast_translator_free_path(fs->trans);
00185          fs->trans = NULL;
00186       }
00187       if (!fs->trans) 
00188          fs->trans = ast_translator_build_path(fs->fmt->format, f->subclass.codec);
00189       if (!fs->trans)
00190          ast_log(LOG_WARNING, "Unable to translate to format %s, source format %s\n",
00191             fs->fmt->name, ast_getformatname(f->subclass.codec));
00192       else {
00193          struct ast_frame *trf;
00194          fs->lastwriteformat = f->subclass.codec;
00195          /* Get the translated frame but don't consume the original in case they're using it on another stream */
00196          if ((trf = ast_translate(fs->trans, f, 0))) {
00197             struct ast_frame *cur;
00198 
00199             /* the translator may have returned multiple frames, so process them */
00200             for (cur = trf; cur; cur = AST_LIST_NEXT(cur, frame_list)) {
00201                if ((res = fs->fmt->write(fs, trf))) {
00202                   ast_log(LOG_WARNING, "Translated frame write failed\n");
00203                   break;
00204                }
00205             }
00206             ast_frfree(trf);
00207          } else {
00208             res = 0;
00209          }
00210       }
00211    }
00212    return res;
00213 }
00214 
00215 static int copy(const char *infile, const char *outfile)
00216 {
00217    int ifd, ofd, len;
00218    char buf[4096];   /* XXX make it lerger. */
00219 
00220    if ((ifd = open(infile, O_RDONLY)) < 0) {
00221       ast_log(LOG_WARNING, "Unable to open %s in read-only mode\n", infile);
00222       return -1;
00223    }
00224    if ((ofd = open(outfile, O_WRONLY | O_TRUNC | O_CREAT, AST_FILE_MODE)) < 0) {
00225       ast_log(LOG_WARNING, "Unable to open %s in write-only mode\n", outfile);
00226       close(ifd);
00227       return -1;
00228    }
00229    while ( (len = read(ifd, buf, sizeof(buf)) ) ) {
00230       int res;
00231       if (len < 0) {
00232          ast_log(LOG_WARNING, "Read failed on %s: %s\n", infile, strerror(errno));
00233          break;
00234       }
00235       /* XXX handle partial writes */
00236       res = write(ofd, buf, len);
00237       if (res != len) {
00238          ast_log(LOG_WARNING, "Write failed on %s (%d of %d): %s\n", outfile, res, len, strerror(errno));
00239          len = -1; /* error marker */
00240          break;
00241       }
00242    }
00243    close(ifd);
00244    close(ofd);
00245    if (len < 0) {
00246       unlink(outfile);
00247       return -1; /* error */
00248    }
00249    return 0;   /* success */
00250 }
00251 
00252 /*!
00253  * \brief construct a filename. Absolute pathnames are preserved,
00254  * relative names are prefixed by the sounds/ directory.
00255  * The wav49 suffix is replaced by 'WAV'.
00256  * Returns a malloc'ed string to be freed by the caller.
00257  */
00258 static char *build_filename(const char *filename, const char *ext)
00259 {
00260    char *fn = NULL;
00261 
00262    if (!strcmp(ext, "wav49"))
00263       ext = "WAV";
00264 
00265    if (filename[0] == '/') {
00266       if (asprintf(&fn, "%s.%s", filename, ext) < 0) {
00267          ast_log(LOG_WARNING, "asprintf() failed: %s\n", strerror(errno));
00268          fn = NULL;
00269       }
00270    } else {
00271       if (asprintf(&fn, "%s/sounds/%s.%s",
00272               ast_config_AST_DATA_DIR, filename, ext) < 0) {
00273          ast_log(LOG_WARNING, "asprintf() failed: %s\n", strerror(errno));
00274          fn = NULL;
00275       }
00276    }
00277    return fn;
00278 }
00279 
00280 /* compare type against the list 'exts' */
00281 /* XXX need a better algorithm */
00282 static int exts_compare(const char *exts, const char *type)
00283 {
00284    char tmp[256];
00285    char *stringp = tmp, *ext;
00286 
00287    ast_copy_string(tmp, exts, sizeof(tmp));
00288    while ((ext = strsep(&stringp, "|"))) {
00289       if (!strcmp(ext, type))
00290          return 1;
00291    }
00292 
00293    return 0;
00294 }
00295 
00296 /*! \internal \brief Close the file stream by canceling any pending read / write callbacks */
00297 static void filestream_close(struct ast_filestream *f)
00298 {
00299    /* Stop a running stream if there is one */
00300    if (f->owner) {
00301       if (f->fmt->format & AST_FORMAT_AUDIO_MASK) {
00302          f->owner->stream = NULL;
00303          AST_SCHED_DEL(f->owner->sched, f->owner->streamid);
00304          ast_settimeout(f->owner, 0, NULL, NULL);
00305       } else if (f->fmt->format & AST_FORMAT_VIDEO_MASK) {
00306          f->owner->vstream = NULL;
00307          AST_SCHED_DEL(f->owner->sched, f->owner->vstreamid);
00308       } else {
00309          ast_log(AST_LOG_WARNING, "Unable to schedule deletion of filestream with unsupported type %s\n", f->fmt->name);
00310       }
00311    }
00312 }
00313 
00314 static void filestream_destructor(void *arg)
00315 {
00316    struct ast_filestream *f = arg;
00317    int status;
00318    int pid = -1;
00319 
00320    /* Stop a running stream if there is one */
00321    filestream_close(f);
00322 
00323    /* destroy the translator on exit */
00324    if (f->trans)
00325       ast_translator_free_path(f->trans);
00326 
00327    if (f->realfilename && f->filename) {
00328       pid = ast_safe_fork(0);
00329       if (!pid) {
00330          execl("/bin/mv", "mv", "-f", f->filename, f->realfilename, SENTINEL);
00331          _exit(1);
00332       }
00333       else if (pid > 0) {
00334          /* Block the parent until the move is complete.*/
00335          waitpid(pid, &status, 0);
00336       }
00337    }
00338 
00339    if (f->filename)
00340       free(f->filename);
00341    if (f->realfilename)
00342       free(f->realfilename);
00343    if (f->fmt->close) {
00344       void (*closefn)(struct ast_filestream *) = f->fmt->close;
00345       closefn(f);
00346    }
00347    if (f->f)
00348       fclose(f->f);
00349    if (f->vfs)
00350       ast_closestream(f->vfs);
00351    if (f->write_buffer) {
00352       ast_free(f->write_buffer);
00353    }
00354    if (f->orig_chan_name)
00355       free((void *) f->orig_chan_name);
00356    ast_module_unref(f->fmt->module);
00357 }
00358 
00359 static struct ast_filestream *get_filestream(struct ast_format *fmt, FILE *bfile)
00360 {
00361    struct ast_filestream *s;
00362 
00363    int l = sizeof(*s) + fmt->buf_size + fmt->desc_size;  /* total allocation size */
00364    if ( (s = ao2_alloc(l, filestream_destructor)) == NULL)
00365       return NULL;
00366    s->fmt = fmt;
00367    s->f = bfile;
00368 
00369    if (fmt->desc_size)
00370       s->_private = ((char *)(s + 1)) + fmt->buf_size;
00371    if (fmt->buf_size)
00372       s->buf = (char *)(s + 1);
00373    s->fr.src = fmt->name;
00374    return s;
00375 }
00376 
00377 /*
00378  * Default implementations of open and rewrite.
00379  * Only use them if you don't have expensive stuff to do.
00380  */
00381 enum wrap_fn { WRAP_OPEN, WRAP_REWRITE };
00382 
00383 static int fn_wrapper(struct ast_filestream *s, const char *comment, enum wrap_fn mode)
00384 {
00385    struct ast_format *f = s->fmt;
00386    int ret = -1;
00387    int (*openfn)(struct ast_filestream *s);
00388 
00389    if (mode == WRAP_OPEN && (openfn = f->open) && openfn(s))
00390       ast_log(LOG_WARNING, "Unable to open format %s\n", f->name);
00391    else if (mode == WRAP_REWRITE && f->rewrite && f->rewrite(s, comment))
00392       ast_log(LOG_WARNING, "Unable to rewrite format %s\n", f->name);
00393    else {
00394       /* preliminary checks succeed. update usecount */
00395       ast_module_ref(f->module);
00396       ret = 0;
00397    }
00398    return ret;
00399 }
00400 
00401 static int rewrite_wrapper(struct ast_filestream *s, const char *comment)
00402 {
00403    return fn_wrapper(s, comment, WRAP_REWRITE);
00404 }
00405 
00406 static int open_wrapper(struct ast_filestream *s)
00407 {
00408    return fn_wrapper(s, NULL, WRAP_OPEN);
00409 }
00410 
00411 enum file_action {
00412    ACTION_EXISTS = 1, /* return matching format if file exists, 0 otherwise */
00413    ACTION_DELETE, /* delete file, return 0 on success, -1 on error */
00414    ACTION_RENAME, /* rename file. return 0 on success, -1 on error */
00415    ACTION_OPEN,
00416    ACTION_COPY /* copy file. return 0 on success, -1 on error */
00417 };
00418 
00419 /*!
00420  * \brief perform various actions on a file. Second argument
00421  * arg2 depends on the command:
00422  * unused for EXISTS and DELETE
00423  * destination file name (const char *) for COPY and RENAME
00424  *    struct ast_channel * for OPEN
00425  * if fmt is NULL, OPEN will return the first matching entry,
00426  * whereas other functions will run on all matching entries.
00427  */
00428 static format_t ast_filehelper(const char *filename, const void *arg2, const char *fmt, const enum file_action action)
00429 {
00430    struct ast_format *f;
00431    format_t res = (action == ACTION_EXISTS) ? 0 : -1;
00432 
00433    AST_RWLIST_RDLOCK(&formats);
00434    /* Check for a specific format */
00435    AST_RWLIST_TRAVERSE(&formats, f, list) {
00436       char *stringp, *ext = NULL;
00437 
00438       if (fmt && !exts_compare(f->exts, fmt))
00439          continue;
00440 
00441       /* Look for a file matching the supported extensions.
00442        * The file must exist, and for OPEN, must match
00443        * one of the formats supported by the channel.
00444        */
00445       stringp = ast_strdupa(f->exts);  /* this is in the stack so does not need to be freed */
00446       while ( (ext = strsep(&stringp, "|")) ) {
00447          struct stat st;
00448          char *fn = build_filename(filename, ext);
00449 
00450          if (fn == NULL)
00451             continue;
00452 
00453          if ( stat(fn, &st) ) { /* file not existent */
00454             ast_free(fn);
00455             continue;
00456          }
00457          /* for 'OPEN' we need to be sure that the format matches
00458           * what the channel can process
00459           */
00460          if (action == ACTION_OPEN) {
00461             struct ast_channel *chan = (struct ast_channel *)arg2;
00462             FILE *bfile;
00463             struct ast_filestream *s;
00464 
00465             if ( !(chan->writeformat & f->format) &&
00466                  !((f->format & AST_FORMAT_AUDIO_MASK && fmt) ||
00467                  (f->format & AST_FORMAT_VIDEO_MASK && fmt))) {
00468                ast_free(fn);
00469                continue;   /* not a supported format */
00470             }
00471             if ( (bfile = fopen(fn, "r")) == NULL) {
00472                ast_free(fn);
00473                continue;   /* cannot open file */
00474             }
00475             s = get_filestream(f, bfile);
00476             if (!s) {
00477                fclose(bfile);
00478                ast_free(fn);  /* cannot allocate descriptor */
00479                continue;
00480             }
00481             if (open_wrapper(s)) {
00482                ast_free(fn);
00483                ast_closestream(s);
00484                continue;   /* cannot run open on file */
00485             }
00486             if (st.st_size == 0) {
00487                ast_log(LOG_WARNING, "File %s detected to have zero size.\n", fn);
00488             }
00489             /* ok this is good for OPEN */
00490             res = 1; /* found */
00491             s->lasttimeout = -1;
00492             s->fmt = f;
00493             s->trans = NULL;
00494             s->filename = NULL;
00495             if (s->fmt->format & AST_FORMAT_AUDIO_MASK) {
00496                if (chan->stream)
00497                   ast_closestream(chan->stream);
00498                chan->stream = s;
00499             } else {
00500                if (chan->vstream)
00501                   ast_closestream(chan->vstream);
00502                chan->vstream = s;
00503             }
00504             ast_free(fn);
00505             break;
00506          }
00507          switch (action) {
00508          case ACTION_OPEN:
00509             break;   /* will never get here */
00510 
00511          case ACTION_EXISTS:  /* return the matching format */
00512             res |= f->format;
00513             break;
00514 
00515          case ACTION_DELETE:
00516             if ( (res = unlink(fn)) )
00517                ast_log(LOG_WARNING, "unlink(%s) failed: %s\n", fn, strerror(errno));
00518             break;
00519 
00520          case ACTION_RENAME:
00521          case ACTION_COPY: {
00522             char *nfn = build_filename((const char *)arg2, ext);
00523             if (!nfn)
00524                ast_log(LOG_WARNING, "Out of memory\n");
00525             else {
00526                res = action == ACTION_COPY ? copy(fn, nfn) : rename(fn, nfn);
00527                if (res)
00528                   ast_log(LOG_WARNING, "%s(%s,%s) failed: %s\n",
00529                      action == ACTION_COPY ? "copy" : "rename",
00530                       fn, nfn, strerror(errno));
00531                ast_free(nfn);
00532             }
00533              }
00534             break;
00535 
00536          default:
00537             ast_log(LOG_WARNING, "Unknown helper %d\n", action);
00538          }
00539          ast_free(fn);
00540       }
00541    }
00542    AST_RWLIST_UNLOCK(&formats);
00543    return res;
00544 }
00545 
00546 static int is_absolute_path(const char *filename)
00547 {
00548    return filename[0] == '/';
00549 }
00550 
00551 static format_t fileexists_test(const char *filename, const char *fmt, const char *lang,
00552             char *buf, int buflen)
00553 {
00554    if (buf == NULL) {
00555       return -1;
00556    }
00557 
00558    if (ast_language_is_prefix && !is_absolute_path(filename)) { /* new layout */
00559       if (lang) {
00560          snprintf(buf, buflen, "%s/%s", lang, filename);
00561       } else {
00562          snprintf(buf, buflen, "%s", filename);
00563       }
00564    } else { /* old layout */
00565       strcpy(buf, filename);  /* first copy the full string */
00566       if (lang) {
00567          /* insert the language and suffix if needed */
00568          const char *c = strrchr(filename, '/');
00569          int offset = c ? c - filename + 1 : 0; /* points right after the last '/' */
00570          snprintf(buf + offset, buflen - offset, "%s/%s", lang, filename + offset);
00571       }
00572    }
00573 
00574    return ast_filehelper(buf, NULL, fmt, ACTION_EXISTS);
00575 }
00576 
00577 /*!
00578  * \brief helper routine to locate a file with a given format
00579  * and language preference.
00580  * Try preflang, preflang with stripped '_' suffices, or NULL.
00581  *
00582  * The last parameter(s) point to a buffer of sufficient size,
00583  * which on success is filled with the matching filename.
00584  */
00585 static format_t fileexists_core(const char *filename, const char *fmt, const char *preflang,
00586             char *buf, int buflen)
00587 {
00588    format_t res = -1;
00589    char *lang;
00590 
00591    if (buf == NULL) {
00592       return -1;
00593    }
00594 
00595    /* We try languages in the following order:
00596     *    preflang (may include dialect and style codes)
00597     *    lang (preflang without dialect - if any)
00598     *    <none>
00599     *    default (unless the same as preflang or lang without dialect)
00600     */
00601 
00602    lang = ast_strdupa(preflang);
00603 
00604    /* Try preferred language, including removing any style or dialect codes */
00605    while (!ast_strlen_zero(lang)) {
00606       char *end;
00607 
00608       if ((res = fileexists_test(filename, fmt, lang, buf, buflen)) > 0) {
00609          return res;
00610       }
00611 
00612       if ((end = strrchr(lang, '_')) != NULL) {
00613          *end = '\0';
00614          continue;
00615       }
00616 
00617       break;
00618    }
00619 
00620    /* Try without any language */
00621    if ((res = fileexists_test(filename, fmt, NULL, buf, buflen)) > 0) {
00622       return res;
00623    }
00624 
00625    /* Finally try the default language unless it was already tried before */
00626    if ((ast_strlen_zero(preflang) || strcmp(preflang, DEFAULT_LANGUAGE)) && (ast_strlen_zero(lang) || strcmp(lang, DEFAULT_LANGUAGE))) {
00627       if ((res = fileexists_test(filename, fmt, DEFAULT_LANGUAGE, buf, buflen)) > 0) {
00628          return res;
00629       }
00630    }
00631 
00632    return 0;
00633 }
00634 
00635 struct ast_filestream *ast_openstream(struct ast_channel *chan, const char *filename, const char *preflang)
00636 {
00637    return ast_openstream_full(chan, filename, preflang, 0);
00638 }
00639 
00640 struct ast_filestream *ast_openstream_full(struct ast_channel *chan, const char *filename, const char *preflang, int asis)
00641 {
00642    /* 
00643     * Use fileexists_core() to find a file in a compatible
00644     * language and format, set up a suitable translator,
00645     * and open the stream.
00646     */
00647    format_t fmts, res;
00648    int buflen;
00649    char *buf;
00650 
00651    if (!asis) {
00652       /* do this first, otherwise we detect the wrong writeformat */
00653       ast_stopstream(chan);
00654       if (chan->generator)
00655          ast_deactivate_generator(chan);
00656    }
00657    if (preflang == NULL)
00658       preflang = "";
00659    buflen = strlen(preflang) + strlen(filename) + 4;
00660    buf = alloca(buflen);
00661    if (buf == NULL)
00662       return NULL;
00663    fmts = fileexists_core(filename, NULL, preflang, buf, buflen);
00664    if (fmts > 0)
00665       fmts &= AST_FORMAT_AUDIO_MASK;
00666    if (fmts < 1) {
00667       ast_log(LOG_WARNING, "File %s does not exist in any format\n", filename);
00668       return NULL;
00669    }
00670    chan->oldwriteformat = chan->writeformat;
00671    /* Set the channel to a format we can work with */
00672    res = ast_set_write_format(chan, fmts);
00673    if (res == -1) {  /* No format available that works with this channel */
00674       return NULL;
00675    }
00676    res = ast_filehelper(buf, chan, NULL, ACTION_OPEN);
00677    if (res >= 0)
00678       return chan->stream;
00679    return NULL;
00680 }
00681 
00682 struct ast_filestream *ast_openvstream(struct ast_channel *chan, const char *filename, const char *preflang)
00683 {
00684    /* As above, but for video. But here we don't have translators
00685     * so we must enforce a format.
00686     */
00687    format_t format;
00688    char *buf;
00689    int buflen;
00690 
00691    if (preflang == NULL)
00692       preflang = "";
00693    buflen = strlen(preflang) + strlen(filename) + 4;
00694    buf = alloca(buflen);
00695    if (buf == NULL)
00696       return NULL;
00697 
00698    for (format = AST_FORMAT_FIRST_VIDEO_BIT; format <= AST_FORMAT_VIDEO_MASK; format = format << 1) {
00699       int fd;
00700       const char *fmt;
00701 
00702       if (!(chan->nativeformats & format))
00703          continue;
00704       fmt = ast_getformatname(format);
00705       if ( fileexists_core(filename, fmt, preflang, buf, buflen) < 1)   /* no valid format */
00706          continue;
00707       fd = ast_filehelper(buf, chan, fmt, ACTION_OPEN);
00708       if (fd >= 0)
00709          return chan->vstream;
00710       ast_log(LOG_WARNING, "File %s has video but couldn't be opened\n", filename);
00711    }
00712    return NULL;
00713 }
00714 
00715 static struct ast_frame *read_frame(struct ast_filestream *s, int *whennext)
00716 {
00717    struct ast_frame *fr, *new_fr;
00718 
00719    if (!s || !s->fmt) {
00720       return NULL;
00721    }
00722 
00723    if (!(fr = s->fmt->read(s, whennext))) {
00724       return NULL;
00725    }
00726 
00727    if (!(new_fr = ast_frisolate(fr))) {
00728       ast_frfree(fr);
00729       return NULL;
00730    }
00731 
00732    if (new_fr != fr) {
00733       ast_frfree(fr);
00734       fr = new_fr;
00735    }
00736 
00737    return fr;
00738 }
00739 
00740 struct ast_frame *ast_readframe(struct ast_filestream *s)
00741 {
00742    int whennext = 0;
00743 
00744    return read_frame(s, &whennext);
00745 }
00746 
00747 enum fsread_res {
00748    FSREAD_FAILURE,
00749    FSREAD_SUCCESS_SCHED,
00750    FSREAD_SUCCESS_NOSCHED,
00751 };
00752 
00753 static int ast_fsread_audio(const void *data);
00754 
00755 static enum fsread_res ast_readaudio_callback(struct ast_filestream *s)
00756 {
00757    int whennext = 0;
00758 
00759    while (!whennext) {
00760       struct ast_frame *fr;
00761 
00762       if (s->orig_chan_name && strcasecmp(s->owner->name, s->orig_chan_name)) {
00763          goto return_failure;
00764       }
00765 
00766       fr = read_frame(s, &whennext);
00767 
00768       if (!fr /* stream complete */ || ast_write(s->owner, fr) /* error writing */) {
00769          if (fr) {
00770             ast_log(LOG_WARNING, "Failed to write frame\n");
00771             ast_frfree(fr);
00772          }
00773          goto return_failure;
00774       } 
00775 
00776       if (fr) {
00777          ast_frfree(fr);
00778       }
00779    }
00780 
00781    if (whennext != s->lasttimeout) {
00782       if (s->owner->timingfd > -1) {
00783          float samp_rate = (float) ast_format_rate(s->fmt->format);
00784          unsigned int rate;
00785 
00786          rate = (unsigned int) roundf(samp_rate / ((float) whennext));
00787 
00788          ast_settimeout(s->owner, rate, ast_fsread_audio, s);
00789       } else {
00790          s->owner->streamid = ast_sched_add(s->owner->sched, 
00791             whennext / (ast_format_rate(s->fmt->format) / 1000), ast_fsread_audio, s);
00792       }
00793       s->lasttimeout = whennext;
00794       return FSREAD_SUCCESS_NOSCHED;
00795    }
00796    return FSREAD_SUCCESS_SCHED;
00797 
00798 return_failure:
00799    s->owner->streamid = -1;
00800    ast_settimeout(s->owner, 0, NULL, NULL);
00801    return FSREAD_FAILURE;
00802 }
00803 
00804 static int ast_fsread_audio(const void *data)
00805 {
00806    struct ast_filestream *fs = (struct ast_filestream *)data;
00807    enum fsread_res res;
00808 
00809    res = ast_readaudio_callback(fs);
00810 
00811    if (res == FSREAD_SUCCESS_SCHED)
00812       return 1;
00813    
00814    return 0;
00815 }
00816 
00817 static int ast_fsread_video(const void *data);
00818 
00819 static enum fsread_res ast_readvideo_callback(struct ast_filestream *s)
00820 {
00821    int whennext = 0;
00822 
00823    while (!whennext) {
00824       struct ast_frame *fr = read_frame(s, &whennext);
00825 
00826       if (!fr /* stream complete */ || ast_write(s->owner, fr) /* error writing */) {
00827          if (fr) {
00828             ast_log(LOG_WARNING, "Failed to write frame\n");
00829             ast_frfree(fr);
00830          }
00831          s->owner->vstreamid = -1;
00832          return FSREAD_FAILURE;
00833       }
00834 
00835       if (fr) {
00836          ast_frfree(fr);
00837       }
00838    }
00839 
00840    if (whennext != s->lasttimeout) {
00841       s->owner->vstreamid = ast_sched_add(s->owner->sched, 
00842          whennext / (ast_format_rate(s->fmt->format) / 1000), 
00843          ast_fsread_video, s);
00844       s->lasttimeout = whennext;
00845       return FSREAD_SUCCESS_NOSCHED;
00846    }
00847 
00848    return FSREAD_SUCCESS_SCHED;
00849 }
00850 
00851 static int ast_fsread_video(const void *data)
00852 {
00853    struct ast_filestream *fs = (struct ast_filestream *)data;
00854    enum fsread_res res;
00855 
00856    res = ast_readvideo_callback(fs);
00857 
00858    if (res == FSREAD_SUCCESS_SCHED)
00859       return 1;
00860    
00861    return 0;
00862 }
00863 
00864 int ast_applystream(struct ast_channel *chan, struct ast_filestream *s)
00865 {
00866    s->owner = chan;
00867    return 0;
00868 }
00869 
00870 int ast_playstream(struct ast_filestream *s)
00871 {
00872    enum fsread_res res;
00873 
00874    if (s->fmt->format & AST_FORMAT_AUDIO_MASK)
00875       res = ast_readaudio_callback(s);
00876    else
00877       res = ast_readvideo_callback(s);
00878 
00879    return (res == FSREAD_FAILURE) ? -1 : 0;
00880 }
00881 
00882 int ast_seekstream(struct ast_filestream *fs, off_t sample_offset, int whence)
00883 {
00884    return fs->fmt->seek(fs, sample_offset, whence);
00885 }
00886 
00887 int ast_truncstream(struct ast_filestream *fs)
00888 {
00889    return fs->fmt->trunc(fs);
00890 }
00891 
00892 off_t ast_tellstream(struct ast_filestream *fs)
00893 {
00894    return fs->fmt->tell(fs);
00895 }
00896 
00897 int ast_stream_fastforward(struct ast_filestream *fs, off_t ms)
00898 {
00899    return ast_seekstream(fs, ms * DEFAULT_SAMPLES_PER_MS, SEEK_CUR);
00900 }
00901 
00902 int ast_stream_rewind(struct ast_filestream *fs, off_t ms)
00903 {
00904    return ast_seekstream(fs, -ms * DEFAULT_SAMPLES_PER_MS, SEEK_CUR);
00905 }
00906 
00907 int ast_closestream(struct ast_filestream *f)
00908 {
00909    /* This used to destroy the filestream, but it now just decrements a refcount.
00910     * We close the stream in order to quit queuing frames now, because we might
00911     * change the writeformat, which could result in a subsequent write error, if
00912     * the format is different. */
00913    filestream_close(f);
00914    ao2_ref(f, -1);
00915    return 0;
00916 }
00917 
00918 
00919 /*
00920  * Look the various language-specific places where a file could exist.
00921  */
00922 int ast_fileexists(const char *filename, const char *fmt, const char *preflang)
00923 {
00924    char *buf;
00925    int buflen;
00926 
00927    if (preflang == NULL)
00928       preflang = "";
00929    buflen = strlen(preflang) + strlen(filename) + 4;  /* room for everything */
00930    buf = alloca(buflen);
00931    if (buf == NULL)
00932       return 0;
00933    return fileexists_core(filename, fmt, preflang, buf, buflen);
00934 }
00935 
00936 int ast_filedelete(const char *filename, const char *fmt)
00937 {
00938    return ast_filehelper(filename, NULL, fmt, ACTION_DELETE);
00939 }
00940 
00941 int ast_filerename(const char *filename, const char *filename2, const char *fmt)
00942 {
00943    return ast_filehelper(filename, filename2, fmt, ACTION_RENAME);
00944 }
00945 
00946 int ast_filecopy(const char *filename, const char *filename2, const char *fmt)
00947 {
00948    return ast_filehelper(filename, filename2, fmt, ACTION_COPY);
00949 }
00950 
00951 int ast_streamfile(struct ast_channel *chan, const char *filename, const char *preflang)
00952 {
00953    struct ast_filestream *fs;
00954    struct ast_filestream *vfs=NULL;
00955    char fmt[256];
00956    off_t pos;
00957    int seekattempt;
00958    int res;
00959 
00960    fs = ast_openstream(chan, filename, preflang);
00961    if (!fs) {
00962       ast_log(LOG_WARNING, "Unable to open %s (format %s): %s\n", filename, ast_getformatname_multiple(fmt, sizeof(fmt), chan->nativeformats), strerror(errno));
00963       return -1;
00964    }
00965 
00966    /* check to see if there is any data present (not a zero length file),
00967     * done this way because there is no where for ast_openstream_full to
00968     * return the file had no data. */
00969    pos = ftello(fs->f);
00970    seekattempt = fseeko(fs->f, -1, SEEK_END);
00971    if (seekattempt) {
00972       if (errno == EINVAL) {
00973          /* Zero-length file, as opposed to a pipe */
00974          return 0;
00975       } else {
00976          ast_seekstream(fs, 0, SEEK_SET);
00977       }
00978    } else {
00979       fseeko(fs->f, pos, SEEK_SET);
00980    }
00981 
00982    vfs = ast_openvstream(chan, filename, preflang);
00983    if (vfs) {
00984       ast_debug(1, "Ooh, found a video stream, too, format %s\n", ast_getformatname(vfs->fmt->format));
00985    }
00986 
00987    if (ast_test_flag(chan, AST_FLAG_MASQ_NOSTREAM))
00988       fs->orig_chan_name = ast_strdup(chan->name);
00989    if (ast_applystream(chan, fs))
00990       return -1;
00991    if (vfs && ast_applystream(chan, vfs))
00992       return -1;
00993    res = ast_playstream(fs);
00994    if (!res && vfs)
00995       res = ast_playstream(vfs);
00996    ast_verb(3, "<%s> Playing '%s.%s' (language '%s')\n", chan->name, filename, ast_getformatname(chan->writeformat), preflang ? preflang : "default");
00997 
00998    return res;
00999 }
01000 
01001 struct ast_filestream *ast_readfile(const char *filename, const char *type, const char *comment, int flags, int check, mode_t mode)
01002 {
01003    FILE *bfile;
01004    struct ast_format *f;
01005    struct ast_filestream *fs = NULL;
01006    char *fn;
01007    int format_found = 0;   
01008 
01009    AST_RWLIST_RDLOCK(&formats);
01010 
01011    AST_RWLIST_TRAVERSE(&formats, f, list) {
01012       fs = NULL;
01013       if (!exts_compare(f->exts, type))
01014          continue;
01015       else 
01016          format_found = 1;
01017 
01018       fn = build_filename(filename, type);
01019       errno = 0;
01020       bfile = fopen(fn, "r");
01021 
01022       if (!bfile || (fs = get_filestream(f, bfile)) == NULL || open_wrapper(fs) ) {
01023          ast_log(LOG_WARNING, "Unable to open %s\n", fn);
01024          if (fs) {
01025             ast_closestream(fs);
01026          }
01027          fs = NULL;
01028          bfile = NULL;
01029          ast_free(fn);
01030          break;            
01031       }
01032       /* found it */
01033       fs->trans = NULL;
01034       fs->fmt = f;
01035       fs->flags = flags;
01036       fs->mode = mode;
01037       fs->filename = ast_strdup(filename);
01038       fs->vfs = NULL;
01039       break;
01040    }
01041 
01042    AST_RWLIST_UNLOCK(&formats);
01043    if (!format_found)
01044       ast_log(LOG_WARNING, "No such format '%s'\n", type);
01045 
01046    return fs;
01047 }
01048 
01049 struct ast_filestream *ast_writefile(const char *filename, const char *type, const char *comment, int flags, int check, mode_t mode)
01050 {
01051    int fd, myflags = 0;
01052    /* compiler claims this variable can be used before initialization... */
01053    FILE *bfile = NULL;
01054    struct ast_format *f;
01055    struct ast_filestream *fs = NULL;
01056    char *buf = NULL;
01057    size_t size = 0;
01058    int format_found = 0;
01059 
01060    AST_RWLIST_RDLOCK(&formats);
01061 
01062    /* set the O_TRUNC flag if and only if there is no O_APPEND specified */
01063    /* We really can't use O_APPEND as it will break WAV header updates */
01064    if (flags & O_APPEND) { 
01065       flags &= ~O_APPEND;
01066    } else {
01067       myflags = O_TRUNC;
01068    }
01069    
01070    myflags |= O_WRONLY | O_CREAT;
01071 
01072    /* XXX need to fix this - we should just do the fopen,
01073     * not open followed by fdopen()
01074     */
01075    AST_RWLIST_TRAVERSE(&formats, f, list) {
01076       char *fn, *orig_fn = NULL;
01077       if (fs)
01078          break;
01079 
01080       if (!exts_compare(f->exts, type))
01081          continue;
01082       else
01083          format_found = 1;
01084 
01085       fn = build_filename(filename, type);
01086       fd = open(fn, flags | myflags, mode);
01087       if (fd > -1) {
01088          /* fdopen() the resulting file stream */
01089          bfile = fdopen(fd, ((flags | myflags) & O_RDWR) ? "w+" : "w");
01090          if (!bfile) {
01091             ast_log(LOG_WARNING, "Whoa, fdopen failed: %s!\n", strerror(errno));
01092             close(fd);
01093             fd = -1;
01094          }
01095       }
01096       
01097       if (ast_opt_cache_record_files && (fd > -1)) {
01098          char *c;
01099 
01100          fclose(bfile); /* this also closes fd */
01101          /*
01102            We touch orig_fn just as a place-holder so other things (like vmail) see the file is there.
01103            What we are really doing is writing to record_cache_dir until we are done then we will mv the file into place.
01104          */
01105          orig_fn = ast_strdupa(fn);
01106          for (c = fn; *c; c++)
01107             if (*c == '/')
01108                *c = '_';
01109 
01110          size = strlen(fn) + strlen(record_cache_dir) + 2;
01111          buf = alloca(size);
01112          strcpy(buf, record_cache_dir);
01113          strcat(buf, "/");
01114          strcat(buf, fn);
01115          ast_free(fn);
01116          fn = buf;
01117          fd = open(fn, flags | myflags, mode);
01118          if (fd > -1) {
01119             /* fdopen() the resulting file stream */
01120             bfile = fdopen(fd, ((flags | myflags) & O_RDWR) ? "w+" : "w");
01121             if (!bfile) {
01122                ast_log(LOG_WARNING, "Whoa, fdopen failed: %s!\n", strerror(errno));
01123                close(fd);
01124                fd = -1;
01125             }
01126          }
01127       }
01128       if (fd > -1) {
01129          errno = 0;
01130          fs = get_filestream(f, bfile);
01131          if (fs) {
01132             if ((fs->write_buffer = ast_malloc(32768))) {
01133                setvbuf(fs->f, fs->write_buffer, _IOFBF, 32768);
01134             }
01135          }
01136          if (!fs || rewrite_wrapper(fs, comment)) {
01137             ast_log(LOG_WARNING, "Unable to rewrite %s\n", fn);
01138             close(fd);
01139             if (orig_fn) {
01140                unlink(fn);
01141                unlink(orig_fn);
01142             }
01143             if (fs) {
01144                ast_closestream(fs);
01145                fs = NULL;
01146             }
01147             continue;
01148          }
01149          fs->trans = NULL;
01150          fs->fmt = f;
01151          fs->flags = flags;
01152          fs->mode = mode;
01153          if (orig_fn) {
01154             fs->realfilename = ast_strdup(orig_fn);
01155             fs->filename = ast_strdup(fn);
01156          } else {
01157             fs->realfilename = NULL;
01158             fs->filename = ast_strdup(filename);
01159          }
01160          fs->vfs = NULL;
01161          /* If truncated, we'll be at the beginning; if not truncated, then append */
01162          f->seek(fs, 0, SEEK_END);
01163       } else if (errno != EEXIST) {
01164          ast_log(LOG_WARNING, "Unable to open file %s: %s\n", fn, strerror(errno));
01165          if (orig_fn)
01166             unlink(orig_fn);
01167       }
01168       /* if buf != NULL then fn is already free and pointing to it */
01169       if (!buf)
01170          ast_free(fn);
01171    }
01172 
01173    AST_RWLIST_UNLOCK(&formats);
01174 
01175    if (!format_found)
01176       ast_log(LOG_WARNING, "No such format '%s'\n", type);
01177 
01178    return fs;
01179 }
01180 
01181 /*!
01182  * \brief the core of all waitstream() functions
01183  */
01184 static int waitstream_core(struct ast_channel *c, const char *breakon,
01185    const char *forward, const char *reverse, int skip_ms,
01186    int audiofd, int cmdfd,  const char *context)
01187 {
01188    const char *orig_chan_name = NULL;
01189    int err = 0;
01190 
01191    if (!breakon)
01192       breakon = "";
01193    if (!forward)
01194       forward = "";
01195    if (!reverse)
01196       reverse = "";
01197 
01198    /* Switch the channel to end DTMF frame only. waitstream_core doesn't care about the start of DTMF. */
01199    ast_set_flag(c, AST_FLAG_END_DTMF_ONLY);
01200 
01201    if (ast_test_flag(c, AST_FLAG_MASQ_NOSTREAM))
01202       orig_chan_name = ast_strdupa(c->name);
01203 
01204    while (c->stream) {
01205       int res;
01206       int ms;
01207 
01208       if (orig_chan_name && strcasecmp(orig_chan_name, c->name)) {
01209          ast_stopstream(c);
01210          err = 1;
01211          break;
01212       }
01213 
01214       ms = ast_sched_wait(c->sched);
01215 
01216       if (ms < 0 && !c->timingfunc) {
01217          ast_stopstream(c);
01218          break;
01219       }
01220       if (ms < 0)
01221          ms = 1000;
01222       if (cmdfd < 0) {
01223          res = ast_waitfor(c, ms);
01224          if (res < 0) {
01225             ast_log(LOG_WARNING, "Select failed (%s)\n", strerror(errno));
01226             ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01227             return res;
01228          }
01229       } else {
01230          int outfd;
01231          struct ast_channel *rchan = ast_waitfor_nandfds(&c, 1, &cmdfd, (cmdfd > -1) ? 1 : 0, NULL, &outfd, &ms);
01232          if (!rchan && (outfd < 0) && (ms)) {
01233             /* Continue */
01234             if (errno == EINTR)
01235                continue;
01236             ast_log(LOG_WARNING, "Wait failed (%s)\n", strerror(errno));
01237             ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01238             return -1;
01239          } else if (outfd > -1) { /* this requires cmdfd set */
01240             /* The FD we were watching has something waiting */
01241             ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01242             return 1;
01243          }
01244          /* if rchan is set, it is 'c' */
01245          res = rchan ? 1 : 0; /* map into 'res' values */
01246       }
01247       if (res > 0) {
01248          struct ast_frame *fr = ast_read(c);
01249          if (!fr) {
01250             ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01251             return -1;
01252          }
01253          switch (fr->frametype) {
01254          case AST_FRAME_DTMF_END:
01255             if (context) {
01256                const char exten[2] = { fr->subclass.integer, '\0' };
01257                if (ast_exists_extension(c, context, exten, 1,
01258                   S_COR(c->caller.id.number.valid, c->caller.id.number.str, NULL))) {
01259                   res = fr->subclass.integer;
01260                   ast_frfree(fr);
01261                   ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01262                   return res;
01263                }
01264             } else {
01265                res = fr->subclass.integer;
01266                if (strchr(forward, res)) {
01267                   int eoftest;
01268                   ast_stream_fastforward(c->stream, skip_ms);
01269                   eoftest = fgetc(c->stream->f);
01270                   if (feof(c->stream->f)) {
01271                      ast_stream_rewind(c->stream, skip_ms);
01272                   } else {
01273                      ungetc(eoftest, c->stream->f);
01274                   }
01275                } else if (strchr(reverse, res)) {
01276                   ast_stream_rewind(c->stream, skip_ms);
01277                } else if (strchr(breakon, res)) {
01278                   ast_frfree(fr);
01279                   ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01280                   return res;
01281                }              
01282             }
01283             break;
01284          case AST_FRAME_CONTROL:
01285             switch (fr->subclass.integer) {
01286             case AST_CONTROL_HANGUP:
01287             case AST_CONTROL_BUSY:
01288             case AST_CONTROL_CONGESTION:
01289                ast_frfree(fr);
01290                ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01291                return -1;
01292             case AST_CONTROL_RINGING:
01293             case AST_CONTROL_ANSWER:
01294             case AST_CONTROL_VIDUPDATE:
01295             case AST_CONTROL_SRCUPDATE:
01296             case AST_CONTROL_SRCCHANGE:
01297             case AST_CONTROL_HOLD:
01298             case AST_CONTROL_UNHOLD:
01299             case AST_CONTROL_CONNECTED_LINE:
01300             case AST_CONTROL_REDIRECTING:
01301             case AST_CONTROL_AOC:
01302             case AST_CONTROL_UPDATE_RTP_PEER:
01303             case -1:
01304                /* Unimportant */
01305                break;
01306             default:
01307                ast_log(LOG_WARNING, "Unexpected control subclass '%d'\n", fr->subclass.integer);
01308             }
01309             break;
01310          case AST_FRAME_VOICE:
01311             /* Write audio if appropriate */
01312             if (audiofd > -1) {
01313                if (write(audiofd, fr->data.ptr, fr->datalen) < 0) {
01314                   ast_log(LOG_WARNING, "write() failed: %s\n", strerror(errno));
01315                }
01316             }
01317          default:
01318             /* Ignore all others */
01319             break;
01320          }
01321          ast_frfree(fr);
01322       }
01323       ast_sched_runq(c->sched);
01324    }
01325 
01326    ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01327 
01328    return (err || c->_softhangup) ? -1 : 0;
01329 }
01330 
01331 int ast_waitstream_fr(struct ast_channel *c, const char *breakon, const char *forward, const char *reverse, int ms)
01332 {
01333    return waitstream_core(c, breakon, forward, reverse, ms,
01334       -1 /* no audiofd */, -1 /* no cmdfd */, NULL /* no context */);
01335 }
01336 
01337 int ast_waitstream(struct ast_channel *c, const char *breakon)
01338 {
01339    return waitstream_core(c, breakon, NULL, NULL, 0, -1, -1, NULL);
01340 }
01341 
01342 int ast_waitstream_full(struct ast_channel *c, const char *breakon, int audiofd, int cmdfd)
01343 {
01344    return waitstream_core(c, breakon, NULL, NULL, 0,
01345       audiofd, cmdfd, NULL /* no context */);
01346 }
01347 
01348 int ast_waitstream_exten(struct ast_channel *c, const char *context)
01349 {
01350    /* Waitstream, with return in the case of a valid 1 digit extension */
01351    /* in the current or specified context being pressed */
01352 
01353    if (!context)
01354       context = c->context;
01355    return waitstream_core(c, NULL, NULL, NULL, 0,
01356       -1, -1, context);
01357 }
01358 
01359 /*
01360  * if the file name is non-empty, try to play it.
01361  * Return 0 if success, -1 if error, digit if interrupted by a digit.
01362  * If digits == "" then we can simply check for non-zero.
01363  */
01364 int ast_stream_and_wait(struct ast_channel *chan, const char *file, const char *digits)
01365 {
01366    int res = 0;
01367    if (!ast_strlen_zero(file)) {
01368       ast_test_suite_event_notify("PLAYBACK", "Message: %s", file);
01369       res = ast_streamfile(chan, file, chan->language);
01370       if (!res) {
01371          res = ast_waitstream(chan, digits);
01372       }
01373    }
01374    return res;
01375 } 
01376 
01377 char *ast_format_str_reduce(char *fmts)
01378 {
01379    struct ast_format *f;
01380    struct ast_format *fmts_ptr[AST_MAX_FORMATS];
01381    char *fmts_str[AST_MAX_FORMATS];
01382    char *stringp, *type;
01383    char *orig = fmts;
01384    int i, j, x, first, found = 0;
01385    int len = strlen(fmts) + 1;
01386    int res;
01387 
01388    if (AST_RWLIST_RDLOCK(&formats)) {
01389       ast_log(LOG_WARNING, "Unable to lock format list\n");
01390       return NULL;
01391    }
01392 
01393    stringp = ast_strdupa(fmts);
01394 
01395    for (x = 0; (type = strsep(&stringp, "|")) && x < AST_MAX_FORMATS; x++) {
01396       AST_RWLIST_TRAVERSE(&formats, f, list) {
01397          if (exts_compare(f->exts, type)) {
01398             found = 1;
01399             break;
01400          }
01401       }
01402 
01403       fmts_str[x] = type;
01404       if (found) {
01405          fmts_ptr[x] = f;
01406       } else {
01407          fmts_ptr[x] = NULL;
01408       }
01409    }
01410    AST_RWLIST_UNLOCK(&formats);
01411 
01412    first = 1;
01413    for (i = 0; i < x; i++) {
01414       /* ignore invalid entries */
01415       if (!fmts_ptr[i]) {
01416          ast_log(LOG_WARNING, "ignoring unknown format '%s'\n", fmts_str[i]);
01417          continue;
01418       }
01419 
01420       /* special handling for the first entry */
01421       if (first) {
01422          res = snprintf(fmts, len, "%s", fmts_str[i]);
01423          fmts += res;
01424          len -= res;
01425          first = 0;
01426          continue;
01427       }
01428 
01429       found = 0;
01430       for (j = 0; j < i; j++) {
01431          /* this is a duplicate */
01432          if (fmts_ptr[j] == fmts_ptr[i]) {
01433             found = 1;
01434             break;
01435          }
01436       }
01437 
01438       if (!found) {
01439          res = snprintf(fmts, len, "|%s", fmts_str[i]);
01440          fmts += res;
01441          len -= res;
01442       }
01443    }
01444 
01445    if (first) {
01446       ast_log(LOG_WARNING, "no known formats found in format list (%s)\n", orig);
01447       return NULL;
01448    }
01449 
01450    return orig;
01451 }
01452 
01453 static char *handle_cli_core_show_file_formats(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
01454 {
01455 #define FORMAT "%-10s %-10s %-20s\n"
01456 #define FORMAT2 "%-10s %-10s %-20s\n"
01457    struct ast_format *f;
01458    int count_fmt = 0;
01459 
01460    switch (cmd) {
01461    case CLI_INIT:
01462       e->command = "core show file formats";
01463       e->usage =
01464          "Usage: core show file formats\n"
01465          "       Displays currently registered file formats (if any).\n";
01466       return NULL;
01467    case CLI_GENERATE:
01468       return NULL;
01469    }
01470 
01471    if (a->argc != 4)
01472       return CLI_SHOWUSAGE;
01473 
01474    ast_cli(a->fd, FORMAT, "Format", "Name", "Extensions");
01475    ast_cli(a->fd, FORMAT, "------", "----", "----------");
01476 
01477    AST_RWLIST_RDLOCK(&formats);
01478    AST_RWLIST_TRAVERSE(&formats, f, list) {
01479       ast_cli(a->fd, FORMAT2, ast_getformatname(f->format), f->name, f->exts);
01480       count_fmt++;
01481    }
01482    AST_RWLIST_UNLOCK(&formats);
01483    ast_cli(a->fd, "%d file formats registered.\n", count_fmt);
01484    return CLI_SUCCESS;
01485 #undef FORMAT
01486 #undef FORMAT2
01487 }
01488 
01489 static struct ast_cli_entry cli_file[] = {
01490    AST_CLI_DEFINE(handle_cli_core_show_file_formats, "Displays file formats")
01491 };
01492 
01493 int ast_file_init(void)
01494 {
01495    ast_cli_register_multiple(cli_file, ARRAY_LEN(cli_file));
01496    return 0;
01497 }

Generated on Mon Oct 8 12:39:02 2012 for Asterisk - The Open Source Telephony Project by  doxygen 1.4.7