Wed Oct 28 11:45:37 2009

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 #include "asterisk.h"
00027 
00028 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 222881 $")
00029 
00030 #include <dirent.h>
00031 #include <sys/stat.h>
00032 
00033 #include "asterisk/_private.h"   /* declare ast_file_init() */
00034 #include "asterisk/paths.h"   /* use ast_config_AST_DATA_DIR */
00035 #include "asterisk/mod_format.h"
00036 #include "asterisk/cli.h"
00037 #include "asterisk/channel.h"
00038 #include "asterisk/sched.h"
00039 #include "asterisk/translate.h"
00040 #include "asterisk/utils.h"
00041 #include "asterisk/lock.h"
00042 #include "asterisk/app.h"
00043 #include "asterisk/pbx.h"
00044 #include "asterisk/linkedlists.h"
00045 #include "asterisk/module.h"
00046 #include "asterisk/astobj2.h"
00047 
00048 /*
00049  * The following variable controls the layout of localized sound files.
00050  * If 0, use the historical layout with prefix just before the filename
00051  * (i.e. digits/en/1.gsm , digits/it/1.gsm or default to digits/1.gsm),
00052  * if 1 put the prefix at the beginning of the filename
00053  * (i.e. en/digits/1.gsm, it/digits/1.gsm or default to digits/1.gsm).
00054  * The latter permits a language to be entirely in one directory.
00055  */
00056 int ast_language_is_prefix = 1;
00057 
00058 static AST_RWLIST_HEAD_STATIC(formats, ast_format);
00059 
00060 int __ast_format_register(const struct ast_format *f, struct ast_module *mod)
00061 {
00062    struct ast_format *tmp;
00063 
00064    AST_RWLIST_WRLOCK(&formats);
00065    AST_RWLIST_TRAVERSE(&formats, tmp, list) {
00066       if (!strcasecmp(f->name, tmp->name)) {
00067          AST_RWLIST_UNLOCK(&formats);
00068          ast_log(LOG_WARNING, "Tried to register '%s' format, already registered\n", f->name);
00069          return -1;
00070       }
00071    }
00072    if (!(tmp = ast_calloc(1, sizeof(*tmp)))) {
00073       AST_RWLIST_UNLOCK(&formats);
00074       return -1;
00075    }
00076    *tmp = *f;
00077    tmp->module = mod;
00078    if (tmp->buf_size) {
00079       /*
00080        * Align buf_size properly, rounding up to the machine-specific
00081        * alignment for pointers.
00082        */
00083       struct _test_align { void *a, *b; } p;
00084       int align = (char *)&p.b - (char *)&p.a;
00085       tmp->buf_size = ((f->buf_size + align - 1) / align) * align;
00086    }
00087    
00088    memset(&tmp->list, 0, sizeof(tmp->list));
00089 
00090    AST_RWLIST_INSERT_HEAD(&formats, tmp, list);
00091    AST_RWLIST_UNLOCK(&formats);
00092    ast_verb(2, "Registered file format %s, extension(s) %s\n", f->name, f->exts);
00093 
00094    return 0;
00095 }
00096 
00097 int ast_format_unregister(const char *name)
00098 {
00099    struct ast_format *tmp;
00100    int res = -1;
00101 
00102    AST_RWLIST_WRLOCK(&formats);
00103    AST_RWLIST_TRAVERSE_SAFE_BEGIN(&formats, tmp, list) {
00104       if (!strcasecmp(name, tmp->name)) {
00105          AST_RWLIST_REMOVE_CURRENT(list);
00106          ast_free(tmp);
00107          res = 0;
00108       }
00109    }
00110    AST_RWLIST_TRAVERSE_SAFE_END;
00111    AST_RWLIST_UNLOCK(&formats);
00112 
00113    if (!res)
00114       ast_verb(2, "Unregistered format %s\n", name);
00115    else
00116       ast_log(LOG_WARNING, "Tried to unregister format %s, already unregistered\n", name);
00117 
00118    return res;
00119 }
00120 
00121 int ast_stopstream(struct ast_channel *tmp)
00122 {
00123    ast_channel_lock(tmp);
00124 
00125    /* Stop a running stream if there is one */
00126    if (tmp->stream) {
00127       ast_closestream(tmp->stream);
00128       tmp->stream = NULL;
00129       if (tmp->oldwriteformat && ast_set_write_format(tmp, tmp->oldwriteformat))
00130          ast_log(LOG_WARNING, "Unable to restore format back to %d\n", tmp->oldwriteformat);
00131    }
00132    /* Stop the video stream too */
00133    if (tmp->vstream != NULL) {
00134       ast_closestream(tmp->vstream);
00135       tmp->vstream = NULL;
00136    }
00137 
00138    ast_channel_unlock(tmp);
00139 
00140    return 0;
00141 }
00142 
00143 int ast_writestream(struct ast_filestream *fs, struct ast_frame *f)
00144 {
00145    int res = -1;
00146    int alt = 0;
00147    if (f->frametype == AST_FRAME_VIDEO) {
00148       if (fs->fmt->format & AST_FORMAT_AUDIO_MASK) {
00149          /* This is the audio portion.  Call the video one... */
00150          if (!fs->vfs && fs->filename) {
00151             const char *type = ast_getformatname(f->subclass & ~0x1);
00152             fs->vfs = ast_writefile(fs->filename, type, NULL, fs->flags, 0, fs->mode);
00153             ast_debug(1, "Opened video output file\n");
00154          }
00155          if (fs->vfs)
00156             return ast_writestream(fs->vfs, f);
00157          /* else ignore */
00158          return 0;            
00159       } else {
00160          /* Might / might not have mark set */
00161          alt = 1;
00162       }
00163    } else if (f->frametype != AST_FRAME_VOICE) {
00164       ast_log(LOG_WARNING, "Tried to write non-voice frame\n");
00165       return -1;
00166    }
00167    if (((fs->fmt->format | alt) & f->subclass) == f->subclass) {
00168       res =  fs->fmt->write(fs, f);
00169       if (res < 0) 
00170          ast_log(LOG_WARNING, "Natural write failed\n");
00171       else if (res > 0)
00172          ast_log(LOG_WARNING, "Huh??\n");
00173    } else {
00174       /* XXX If they try to send us a type of frame that isn't the normal frame, and isn't
00175              the one we've setup a translator for, we do the "wrong thing" XXX */
00176       if (fs->trans && f->subclass != fs->lastwriteformat) {
00177          ast_translator_free_path(fs->trans);
00178          fs->trans = NULL;
00179       }
00180       if (!fs->trans) 
00181          fs->trans = ast_translator_build_path(fs->fmt->format, f->subclass);
00182       if (!fs->trans)
00183          ast_log(LOG_WARNING, "Unable to translate to format %s, source format %s\n",
00184             fs->fmt->name, ast_getformatname(f->subclass));
00185       else {
00186          struct ast_frame *trf;
00187          fs->lastwriteformat = f->subclass;
00188          /* Get the translated frame but don't consume the original in case they're using it on another stream */
00189          if ((trf = ast_translate(fs->trans, f, 0))) {
00190             struct ast_frame *cur;
00191 
00192             /* the translator may have returned multiple frames, so process them */
00193             for (cur = trf; cur; cur = AST_LIST_NEXT(cur, frame_list)) {
00194                if ((res = fs->fmt->write(fs, trf))) {
00195                   ast_log(LOG_WARNING, "Translated frame write failed\n");
00196                   break;
00197                }
00198             }
00199             ast_frfree(trf);
00200          } else {
00201             res = 0;
00202          }
00203       }
00204    }
00205    return res;
00206 }
00207 
00208 static int copy(const char *infile, const char *outfile)
00209 {
00210    int ifd, ofd, len;
00211    char buf[4096];   /* XXX make it lerger. */
00212 
00213    if ((ifd = open(infile, O_RDONLY)) < 0) {
00214       ast_log(LOG_WARNING, "Unable to open %s in read-only mode\n", infile);
00215       return -1;
00216    }
00217    if ((ofd = open(outfile, O_WRONLY | O_TRUNC | O_CREAT, AST_FILE_MODE)) < 0) {
00218       ast_log(LOG_WARNING, "Unable to open %s in write-only mode\n", outfile);
00219       close(ifd);
00220       return -1;
00221    }
00222    while ( (len = read(ifd, buf, sizeof(buf)) ) ) {
00223       int res;
00224       if (len < 0) {
00225          ast_log(LOG_WARNING, "Read failed on %s: %s\n", infile, strerror(errno));
00226          break;
00227       }
00228       /* XXX handle partial writes */
00229       res = write(ofd, buf, len);
00230       if (res != len) {
00231          ast_log(LOG_WARNING, "Write failed on %s (%d of %d): %s\n", outfile, res, len, strerror(errno));
00232          len = -1; /* error marker */
00233          break;
00234       }
00235    }
00236    close(ifd);
00237    close(ofd);
00238    if (len < 0) {
00239       unlink(outfile);
00240       return -1; /* error */
00241    }
00242    return 0;   /* success */
00243 }
00244 
00245 /*!
00246  * \brief construct a filename. Absolute pathnames are preserved,
00247  * relative names are prefixed by the sounds/ directory.
00248  * The wav49 suffix is replaced by 'WAV'.
00249  * Returns a malloc'ed string to be freed by the caller.
00250  */
00251 static char *build_filename(const char *filename, const char *ext)
00252 {
00253    char *fn = NULL;
00254 
00255    if (!strcmp(ext, "wav49"))
00256       ext = "WAV";
00257 
00258    if (filename[0] == '/') {
00259       if (asprintf(&fn, "%s.%s", filename, ext) < 0) {
00260          ast_log(LOG_WARNING, "asprintf() failed: %s\n", strerror(errno));
00261          fn = NULL;
00262       }
00263    } else {
00264       if (asprintf(&fn, "%s/sounds/%s.%s",
00265               ast_config_AST_DATA_DIR, filename, ext) < 0) {
00266          ast_log(LOG_WARNING, "asprintf() failed: %s\n", strerror(errno));
00267          fn = NULL;
00268       }
00269    }
00270    return fn;
00271 }
00272 
00273 /* compare type against the list 'exts' */
00274 /* XXX need a better algorithm */
00275 static int exts_compare(const char *exts, const char *type)
00276 {
00277    char tmp[256];
00278    char *stringp = tmp, *ext;
00279 
00280    ast_copy_string(tmp, exts, sizeof(tmp));
00281    while ((ext = strsep(&stringp, "|"))) {
00282       if (!strcmp(ext, type))
00283          return 1;
00284    }
00285 
00286    return 0;
00287 }
00288 
00289 static void filestream_destructor(void *arg)
00290 {
00291    char *cmd = NULL;
00292    size_t size = 0;
00293    struct ast_filestream *f = arg;
00294 
00295    /* Stop a running stream if there is one */
00296    if (f->owner) {
00297       if (f->fmt->format < AST_FORMAT_AUDIO_MASK) {
00298          f->owner->stream = NULL;
00299          AST_SCHED_DEL(f->owner->sched, f->owner->streamid);
00300 #ifdef HAVE_DAHDI
00301          ast_settimeout(f->owner, 0, NULL, NULL);
00302 #endif         
00303       } else {
00304          f->owner->vstream = NULL;
00305          AST_SCHED_DEL(f->owner->sched, f->owner->vstreamid);
00306       }
00307    }
00308    /* destroy the translator on exit */
00309    if (f->trans)
00310       ast_translator_free_path(f->trans);
00311 
00312    if (f->realfilename && f->filename) {
00313          size = strlen(f->filename) + strlen(f->realfilename) + 15;
00314          cmd = alloca(size);
00315          memset(cmd,0,size);
00316          snprintf(cmd,size,"/bin/mv -f %s %s",f->filename,f->realfilename);
00317          ast_safe_system(cmd);
00318    }
00319 
00320    if (f->filename)
00321       free(f->filename);
00322    if (f->realfilename)
00323       free(f->realfilename);
00324    if (f->fmt->close) {
00325       void (*closefn)(struct ast_filestream *) = f->fmt->close;
00326       closefn(f);
00327    }
00328    if (f->f)
00329       fclose(f->f);
00330    if (f->vfs)
00331       ast_closestream(f->vfs);
00332    if (f->orig_chan_name)
00333       free((void *) f->orig_chan_name);
00334    ast_module_unref(f->fmt->module);
00335 }
00336 
00337 static struct ast_filestream *get_filestream(struct ast_format *fmt, FILE *bfile)
00338 {
00339    struct ast_filestream *s;
00340 
00341    int l = sizeof(*s) + fmt->buf_size + fmt->desc_size;  /* total allocation size */
00342    if ( (s = ao2_alloc(l, filestream_destructor)) == NULL)
00343       return NULL;
00344    s->fmt = fmt;
00345    s->f = bfile;
00346 
00347    if (fmt->desc_size)
00348       s->_private = ((char *)(s + 1)) + fmt->buf_size;
00349    if (fmt->buf_size)
00350       s->buf = (char *)(s + 1);
00351    s->fr.src = fmt->name;
00352    return s;
00353 }
00354 
00355 /*
00356  * Default implementations of open and rewrite.
00357  * Only use them if you don't have expensive stuff to do.
00358  */
00359 enum wrap_fn { WRAP_OPEN, WRAP_REWRITE };
00360 
00361 static int fn_wrapper(struct ast_filestream *s, const char *comment, enum wrap_fn mode)
00362 {
00363    struct ast_format *f = s->fmt;
00364    int ret = -1;
00365    int (*openfn)(struct ast_filestream *s);
00366 
00367    if (mode == WRAP_OPEN && (openfn = f->open) && openfn(s))
00368       ast_log(LOG_WARNING, "Unable to open format %s\n", f->name);
00369    else if (mode == WRAP_REWRITE && f->rewrite && f->rewrite(s, comment))
00370       ast_log(LOG_WARNING, "Unable to rewrite format %s\n", f->name);
00371    else {
00372       /* preliminary checks succeed. update usecount */
00373       ast_module_ref(f->module);
00374       ret = 0;
00375    }
00376    return ret;
00377 }
00378 
00379 static int rewrite_wrapper(struct ast_filestream *s, const char *comment)
00380 {
00381    return fn_wrapper(s, comment, WRAP_REWRITE);
00382 }
00383 
00384 static int open_wrapper(struct ast_filestream *s)
00385 {
00386    return fn_wrapper(s, NULL, WRAP_OPEN);
00387 }
00388 
00389 enum file_action {
00390    ACTION_EXISTS = 1, /* return matching format if file exists, 0 otherwise */
00391    ACTION_DELETE, /* delete file, return 0 on success, -1 on error */
00392    ACTION_RENAME, /* rename file. return 0 on success, -1 on error */
00393    ACTION_OPEN,
00394    ACTION_COPY /* copy file. return 0 on success, -1 on error */
00395 };
00396 
00397 /*!
00398  * \brief perform various actions on a file. Second argument
00399  * arg2 depends on the command:
00400  * unused for EXISTS and DELETE
00401  * destination file name (const char *) for COPY and RENAME
00402  *    struct ast_channel * for OPEN
00403  * if fmt is NULL, OPEN will return the first matching entry,
00404  * whereas other functions will run on all matching entries.
00405  */
00406 static int ast_filehelper(const char *filename, const void *arg2, const char *fmt, const enum file_action action)
00407 {
00408    struct ast_format *f;
00409    int res = (action == ACTION_EXISTS) ? 0 : -1;
00410 
00411    AST_RWLIST_RDLOCK(&formats);
00412    /* Check for a specific format */
00413    AST_RWLIST_TRAVERSE(&formats, f, list) {
00414       char *stringp, *ext = NULL;
00415 
00416       if (fmt && !exts_compare(f->exts, fmt))
00417          continue;
00418 
00419       /* Look for a file matching the supported extensions.
00420        * The file must exist, and for OPEN, must match
00421        * one of the formats supported by the channel.
00422        */
00423       stringp = ast_strdupa(f->exts);  /* this is in the stack so does not need to be freed */
00424       while ( (ext = strsep(&stringp, "|")) ) {
00425          struct stat st;
00426          char *fn = build_filename(filename, ext);
00427 
00428          if (fn == NULL)
00429             continue;
00430 
00431          if ( stat(fn, &st) ) { /* file not existent */
00432             ast_free(fn);
00433             continue;
00434          }
00435          /* for 'OPEN' we need to be sure that the format matches
00436           * what the channel can process
00437           */
00438          if (action == ACTION_OPEN) {
00439             struct ast_channel *chan = (struct ast_channel *)arg2;
00440             FILE *bfile;
00441             struct ast_filestream *s;
00442 
00443             if ( !(chan->writeformat & f->format) &&
00444                  !(f->format & AST_FORMAT_AUDIO_MASK && fmt)) {
00445                ast_free(fn);
00446                continue;   /* not a supported format */
00447             }
00448             if ( (bfile = fopen(fn, "r")) == NULL) {
00449                ast_free(fn);
00450                continue;   /* cannot open file */
00451             }
00452             s = get_filestream(f, bfile);
00453             if (!s) {
00454                fclose(bfile);
00455                ast_free(fn);  /* cannot allocate descriptor */
00456                continue;
00457             }
00458             if (open_wrapper(s)) {
00459                ast_free(fn);
00460                ast_closestream(s);
00461                continue;   /* cannot run open on file */
00462             }
00463             /* ok this is good for OPEN */
00464             res = 1; /* found */
00465             s->lasttimeout = -1;
00466             s->fmt = f;
00467             s->trans = NULL;
00468             s->filename = NULL;
00469             if (s->fmt->format & AST_FORMAT_AUDIO_MASK) {
00470                if (chan->stream)
00471                   ast_closestream(chan->stream);
00472                chan->stream = s;
00473             } else {
00474                if (chan->vstream)
00475                   ast_closestream(chan->vstream);
00476                chan->vstream = s;
00477             }
00478             ast_free(fn);
00479             break;
00480          }
00481          switch (action) {
00482          case ACTION_OPEN:
00483             break;   /* will never get here */
00484 
00485          case ACTION_EXISTS:  /* return the matching format */
00486             res |= f->format;
00487             break;
00488 
00489          case ACTION_DELETE:
00490             if ( (res = unlink(fn)) )
00491                ast_log(LOG_WARNING, "unlink(%s) failed: %s\n", fn, strerror(errno));
00492             break;
00493 
00494          case ACTION_RENAME:
00495          case ACTION_COPY: {
00496             char *nfn = build_filename((const char *)arg2, ext);
00497             if (!nfn)
00498                ast_log(LOG_WARNING, "Out of memory\n");
00499             else {
00500                res = action == ACTION_COPY ? copy(fn, nfn) : rename(fn, nfn);
00501                if (res)
00502                   ast_log(LOG_WARNING, "%s(%s,%s) failed: %s\n",
00503                      action == ACTION_COPY ? "copy" : "rename",
00504                       fn, nfn, strerror(errno));
00505                ast_free(nfn);
00506             }
00507              }
00508             break;
00509 
00510          default:
00511             ast_log(LOG_WARNING, "Unknown helper %d\n", action);
00512          }
00513          ast_free(fn);
00514       }
00515    }
00516    AST_RWLIST_UNLOCK(&formats);
00517    return res;
00518 }
00519 
00520 static int is_absolute_path(const char *filename)
00521 {
00522    return filename[0] == '/';
00523 }
00524 
00525 static int fileexists_test(const char *filename, const char *fmt, const char *lang,
00526             char *buf, int buflen)
00527 {
00528    if (buf == NULL) {
00529       return -1;
00530    }
00531 
00532    if (ast_language_is_prefix && !is_absolute_path(filename)) { /* new layout */
00533       if (lang) {
00534          snprintf(buf, buflen, "%s/%s", lang, filename);
00535       } else {
00536          snprintf(buf, buflen, "%s", filename);
00537       }
00538    } else { /* old layout */
00539       strcpy(buf, filename);  /* first copy the full string */
00540       if (lang) {
00541          /* insert the language and suffix if needed */
00542          const char *c = strrchr(filename, '/');
00543          int offset = c ? c - filename + 1 : 0; /* points right after the last '/' */
00544          snprintf(buf + offset, buflen - offset, "%s/%s", lang, filename + offset);
00545       }
00546    }
00547 
00548    return ast_filehelper(buf, NULL, fmt, ACTION_EXISTS);
00549 }
00550 
00551 /*!
00552  * \brief helper routine to locate a file with a given format
00553  * and language preference.
00554  * Try preflang, preflang with stripped '_' suffix, or NULL.
00555  * In the standard asterisk, language goes just before the last component.
00556  * In an alternative configuration, the language should be a prefix
00557  * to the actual filename.
00558  *
00559  * The last parameter(s) point to a buffer of sufficient size,
00560  * which on success is filled with the matching filename.
00561  */
00562 static int fileexists_core(const char *filename, const char *fmt, const char *preflang,
00563             char *buf, int buflen)
00564 {
00565    int res = -1;
00566    char *lang = NULL;
00567 
00568    if (buf == NULL) {
00569       return -1;
00570    }
00571 
00572    /* We try languages in the following order:
00573     *    preflang (may include dialect)
00574     *    lang (preflang without dialect - if any)
00575     *    <none>
00576     *    default (unless the same as preflang or lang without dialect)
00577     */
00578 
00579    /* Try preferred language */
00580    if (!ast_strlen_zero(preflang)) {
00581       /* try the preflang exactly as it was requested */
00582       if ((res = fileexists_test(filename, fmt, preflang, buf, buflen)) > 0) {
00583          return res;
00584       } else {
00585          /* try without a dialect */
00586          char *postfix = NULL;
00587          postfix = lang = ast_strdupa(preflang);
00588 
00589          strsep(&postfix, "_");
00590          if (postfix) {
00591             if ((res = fileexists_test(filename, fmt, lang, buf, buflen)) > 0) {
00592                return res;
00593             }
00594          }
00595       }
00596    }
00597 
00598    /* Try without any language */
00599    if ((res = fileexists_test(filename, fmt, NULL, buf, buflen)) > 0) {
00600       return res;
00601    }
00602 
00603    /* Finally try the default language unless it was already tried before */
00604    if ((ast_strlen_zero(preflang) || strcmp(preflang, DEFAULT_LANGUAGE)) && (ast_strlen_zero(lang) || strcmp(lang, DEFAULT_LANGUAGE))) {
00605       if ((res = fileexists_test(filename, fmt, DEFAULT_LANGUAGE, buf, buflen)) > 0) {
00606          return res;
00607       }
00608    }
00609 
00610    return 0;
00611 }
00612 
00613 struct ast_filestream *ast_openstream(struct ast_channel *chan, const char *filename, const char *preflang)
00614 {
00615    return ast_openstream_full(chan, filename, preflang, 0);
00616 }
00617 
00618 struct ast_filestream *ast_openstream_full(struct ast_channel *chan, const char *filename, const char *preflang, int asis)
00619 {
00620    /* 
00621     * Use fileexists_core() to find a file in a compatible
00622     * language and format, set up a suitable translator,
00623     * and open the stream.
00624     */
00625    int fmts, res, buflen;
00626    char *buf;
00627 
00628    if (!asis) {
00629       /* do this first, otherwise we detect the wrong writeformat */
00630       ast_stopstream(chan);
00631       if (chan->generator)
00632          ast_deactivate_generator(chan);
00633    }
00634    if (preflang == NULL)
00635       preflang = "";
00636    buflen = strlen(preflang) + strlen(filename) + 4;
00637    buf = alloca(buflen);
00638    if (buf == NULL)
00639       return NULL;
00640    fmts = fileexists_core(filename, NULL, preflang, buf, buflen);
00641    if (fmts > 0)
00642       fmts &= AST_FORMAT_AUDIO_MASK;
00643    if (fmts < 1) {
00644       ast_log(LOG_WARNING, "File %s does not exist in any format\n", filename);
00645       return NULL;
00646    }
00647    chan->oldwriteformat = chan->writeformat;
00648    /* Set the channel to a format we can work with */
00649    res = ast_set_write_format(chan, fmts);
00650    res = ast_filehelper(buf, chan, NULL, ACTION_OPEN);
00651    if (res >= 0)
00652       return chan->stream;
00653    return NULL;
00654 }
00655 
00656 struct ast_filestream *ast_openvstream(struct ast_channel *chan, const char *filename, const char *preflang)
00657 {
00658    /* As above, but for video. But here we don't have translators
00659     * so we must enforce a format.
00660     */
00661    unsigned int format;
00662    char *buf;
00663    int buflen;
00664 
00665    if (preflang == NULL)
00666       preflang = "";
00667    buflen = strlen(preflang) + strlen(filename) + 4;
00668    buf = alloca(buflen);
00669    if (buf == NULL)
00670       return NULL;
00671 
00672    for (format = AST_FORMAT_AUDIO_MASK + 1; format <= AST_FORMAT_VIDEO_MASK; format = format << 1) {
00673       int fd;
00674       const char *fmt;
00675 
00676       if (!(chan->nativeformats & format))
00677          continue;
00678       fmt = ast_getformatname(format);
00679       if ( fileexists_core(filename, fmt, preflang, buf, buflen) < 1)   /* no valid format */
00680          continue;
00681       fd = ast_filehelper(buf, chan, fmt, ACTION_OPEN);
00682       if (fd >= 0)
00683          return chan->vstream;
00684       ast_log(LOG_WARNING, "File %s has video but couldn't be opened\n", filename);
00685    }
00686    return NULL;
00687 }
00688 
00689 static struct ast_frame *read_frame(struct ast_filestream *s, int *whennext)
00690 {
00691    struct ast_frame *fr, *new_fr;
00692 
00693    if (!s || !s->fmt) {
00694       return NULL;
00695    }
00696 
00697    if (!(fr = s->fmt->read(s, whennext))) {
00698       return NULL;
00699    }
00700 
00701    if (!(new_fr = ast_frisolate(fr))) {
00702       ast_frfree(fr);
00703       return NULL;
00704    }
00705 
00706    if (new_fr != fr) {
00707       ast_frfree(fr);
00708       fr = new_fr;
00709    }
00710 
00711    return fr;
00712 }
00713 
00714 struct ast_frame *ast_readframe(struct ast_filestream *s)
00715 {
00716    int whennext = 0;
00717 
00718    return read_frame(s, &whennext);
00719 }
00720 
00721 enum fsread_res {
00722    FSREAD_FAILURE,
00723    FSREAD_SUCCESS_SCHED,
00724    FSREAD_SUCCESS_NOSCHED,
00725 };
00726 
00727 static int ast_fsread_audio(const void *data);
00728 
00729 static enum fsread_res ast_readaudio_callback(struct ast_filestream *s)
00730 {
00731    int whennext = 0;
00732 
00733    while (!whennext) {
00734       struct ast_frame *fr;
00735 
00736       if (s->orig_chan_name && strcasecmp(s->owner->name, s->orig_chan_name)) {
00737          goto return_failure;
00738       }
00739 
00740       fr = read_frame(s, &whennext);
00741 
00742       if (!fr /* stream complete */ || ast_write(s->owner, fr) /* error writing */) {
00743          if (fr) {
00744             ast_log(LOG_WARNING, "Failed to write frame\n");
00745             ast_frfree(fr);
00746          }
00747          goto return_failure;
00748       } 
00749 
00750       if (fr) {
00751          ast_frfree(fr);
00752       }
00753    }
00754 
00755    if (whennext != s->lasttimeout) {
00756 #ifdef HAVE_DAHDI
00757       if (s->owner->timingfd > -1) {
00758          int dahdi_timer_samples = whennext;
00759          int rate;
00760          /* whennext is in samples, but DAHDI timers operate in 8 kHz samples. */
00761          if ((rate = ast_format_rate(s->fmt->format)) != 8000) {
00762             float factor;
00763             factor = ((float) rate) / ((float) 8000.0); 
00764             dahdi_timer_samples = (int) ( ((float) dahdi_timer_samples) / factor );
00765          }
00766          ast_settimeout(s->owner, dahdi_timer_samples, ast_fsread_audio, s);
00767       } else
00768 #endif      
00769          s->owner->streamid = ast_sched_add(s->owner->sched, 
00770             whennext / (ast_format_rate(s->fmt->format) / 1000), ast_fsread_audio, s);
00771       s->lasttimeout = whennext;
00772       return FSREAD_SUCCESS_NOSCHED;
00773    }
00774    return FSREAD_SUCCESS_SCHED;
00775 
00776 return_failure:
00777    s->owner->streamid = -1;
00778 #ifdef HAVE_DAHDI
00779    ast_settimeout(s->owner, 0, NULL, NULL);
00780 #endif         
00781    return FSREAD_FAILURE;
00782 }
00783 
00784 static int ast_fsread_audio(const void *data)
00785 {
00786    struct ast_filestream *fs = (struct ast_filestream *)data;
00787    enum fsread_res res;
00788 
00789    res = ast_readaudio_callback(fs);
00790 
00791    if (res == FSREAD_SUCCESS_SCHED)
00792       return 1;
00793    
00794    return 0;
00795 }
00796 
00797 static int ast_fsread_video(const void *data);
00798 
00799 static enum fsread_res ast_readvideo_callback(struct ast_filestream *s)
00800 {
00801    int whennext = 0;
00802 
00803    while (!whennext) {
00804       struct ast_frame *fr = read_frame(s, &whennext);
00805 
00806       if (!fr /* stream complete */ || ast_write(s->owner, fr) /* error writing */) {
00807          if (fr) {
00808             ast_log(LOG_WARNING, "Failed to write frame\n");
00809             ast_frfree(fr);
00810          }
00811          s->owner->vstreamid = -1;
00812          return FSREAD_FAILURE;
00813       }
00814 
00815       if (fr) {
00816          ast_frfree(fr);
00817       }
00818    }
00819 
00820    if (whennext != s->lasttimeout) {
00821       s->owner->vstreamid = ast_sched_add(s->owner->sched, 
00822          whennext / (ast_format_rate(s->fmt->format) / 1000), 
00823          ast_fsread_video, s);
00824       s->lasttimeout = whennext;
00825       return FSREAD_SUCCESS_NOSCHED;
00826    }
00827 
00828    return FSREAD_SUCCESS_SCHED;
00829 }
00830 
00831 static int ast_fsread_video(const void *data)
00832 {
00833    struct ast_filestream *fs = (struct ast_filestream *)data;
00834    enum fsread_res res;
00835 
00836    res = ast_readvideo_callback(fs);
00837 
00838    if (res == FSREAD_SUCCESS_SCHED)
00839       return 1;
00840    
00841    return 0;
00842 }
00843 
00844 int ast_applystream(struct ast_channel *chan, struct ast_filestream *s)
00845 {
00846    s->owner = chan;
00847    return 0;
00848 }
00849 
00850 int ast_playstream(struct ast_filestream *s)
00851 {
00852    enum fsread_res res;
00853 
00854    if (s->fmt->format & AST_FORMAT_AUDIO_MASK)
00855       res = ast_readaudio_callback(s);
00856    else
00857       res = ast_readvideo_callback(s);
00858 
00859    return (res == FSREAD_FAILURE) ? -1 : 0;
00860 }
00861 
00862 int ast_seekstream(struct ast_filestream *fs, off_t sample_offset, int whence)
00863 {
00864    return fs->fmt->seek(fs, sample_offset, whence);
00865 }
00866 
00867 int ast_truncstream(struct ast_filestream *fs)
00868 {
00869    return fs->fmt->trunc(fs);
00870 }
00871 
00872 off_t ast_tellstream(struct ast_filestream *fs)
00873 {
00874    return fs->fmt->tell(fs);
00875 }
00876 
00877 int ast_stream_fastforward(struct ast_filestream *fs, off_t ms)
00878 {
00879    return ast_seekstream(fs, ms * DEFAULT_SAMPLES_PER_MS, SEEK_CUR);
00880 }
00881 
00882 int ast_stream_rewind(struct ast_filestream *fs, off_t ms)
00883 {
00884    return ast_seekstream(fs, -ms * DEFAULT_SAMPLES_PER_MS, SEEK_CUR);
00885 }
00886 
00887 int ast_closestream(struct ast_filestream *f)
00888 {
00889    /* This used to destroy the filestream, but it now just decrements a refcount.
00890     * We need to force the stream to quit queuing frames now, because we might
00891     * change the writeformat, which could result in a subsequent write error, if
00892     * the format is different. */
00893 
00894    /* Stop a running stream if there is one */
00895    if (f->owner) {
00896       if (f->fmt->format < AST_FORMAT_AUDIO_MASK) {
00897          f->owner->stream = NULL;
00898          AST_SCHED_DEL(f->owner->sched, f->owner->streamid);
00899          ast_settimeout(f->owner, 0, NULL, NULL);
00900       } else {
00901          f->owner->vstream = NULL;
00902          AST_SCHED_DEL(f->owner->sched, f->owner->vstreamid);
00903       }
00904    }
00905 
00906    ao2_ref(f, -1);
00907    return 0;
00908 }
00909 
00910 
00911 /*
00912  * Look the various language-specific places where a file could exist.
00913  */
00914 int ast_fileexists(const char *filename, const char *fmt, const char *preflang)
00915 {
00916    char *buf;
00917    int buflen;
00918 
00919    if (preflang == NULL)
00920       preflang = "";
00921    buflen = strlen(preflang) + strlen(filename) + 4;  /* room for everything */
00922    buf = alloca(buflen);
00923    if (buf == NULL)
00924       return 0;
00925    return fileexists_core(filename, fmt, preflang, buf, buflen);
00926 }
00927 
00928 int ast_filedelete(const char *filename, const char *fmt)
00929 {
00930    return ast_filehelper(filename, NULL, fmt, ACTION_DELETE);
00931 }
00932 
00933 int ast_filerename(const char *filename, const char *filename2, const char *fmt)
00934 {
00935    return ast_filehelper(filename, filename2, fmt, ACTION_RENAME);
00936 }
00937 
00938 int ast_filecopy(const char *filename, const char *filename2, const char *fmt)
00939 {
00940    return ast_filehelper(filename, filename2, fmt, ACTION_COPY);
00941 }
00942 
00943 int ast_streamfile(struct ast_channel *chan, const char *filename, const char *preflang)
00944 {
00945    struct ast_filestream *fs;
00946    struct ast_filestream *vfs=NULL;
00947    char fmt[256];
00948 
00949    fs = ast_openstream(chan, filename, preflang);
00950    if (fs)
00951       vfs = ast_openvstream(chan, filename, preflang);
00952    if (vfs) {
00953       ast_debug(1, "Ooh, found a video stream, too, format %s\n", ast_getformatname(vfs->fmt->format));
00954    }
00955    if (fs){
00956       int res;
00957       if (ast_test_flag(chan, AST_FLAG_MASQ_NOSTREAM))
00958          fs->orig_chan_name = ast_strdup(chan->name);
00959       if (ast_applystream(chan, fs))
00960          return -1;
00961       if (vfs && ast_applystream(chan, vfs))
00962          return -1;
00963       res = ast_playstream(fs);
00964       if (!res && vfs)
00965          res = ast_playstream(vfs);
00966       ast_verb(3, "<%s> Playing '%s.%s' (language '%s')\n", chan->name, filename, ast_getformatname(chan->writeformat), preflang ? preflang : "default");
00967 
00968       return res;
00969    }
00970    ast_log(LOG_WARNING, "Unable to open %s (format %s): %s\n", filename, ast_getformatname_multiple(fmt, sizeof(fmt), chan->nativeformats), strerror(errno));
00971    return -1;
00972 }
00973 
00974 struct ast_filestream *ast_readfile(const char *filename, const char *type, const char *comment, int flags, int check, mode_t mode)
00975 {
00976    FILE *bfile;
00977    struct ast_format *f;
00978    struct ast_filestream *fs = NULL;
00979    char *fn;
00980    int format_found = 0;   
00981 
00982    AST_RWLIST_RDLOCK(&formats);
00983 
00984    AST_RWLIST_TRAVERSE(&formats, f, list) {
00985       fs = NULL;
00986       if (!exts_compare(f->exts, type))
00987          continue;
00988       else 
00989          format_found = 1;
00990 
00991       fn = build_filename(filename, type);
00992       errno = 0;
00993       bfile = fopen(fn, "r");
00994 
00995       if (!bfile || (fs = get_filestream(f, bfile)) == NULL || open_wrapper(fs) ) {
00996          ast_log(LOG_WARNING, "Unable to open %s\n", fn);
00997          if (fs) {
00998             ast_closestream(fs);
00999          }
01000          fs = NULL;
01001          bfile = NULL;
01002          ast_free(fn);
01003          break;            
01004       }
01005       /* found it */
01006       fs->trans = NULL;
01007       fs->fmt = f;
01008       fs->flags = flags;
01009       fs->mode = mode;
01010       fs->filename = ast_strdup(filename);
01011       fs->vfs = NULL;
01012       break;
01013    }
01014 
01015    AST_RWLIST_UNLOCK(&formats);
01016    if (!format_found)
01017       ast_log(LOG_WARNING, "No such format '%s'\n", type);
01018 
01019    return fs;
01020 }
01021 
01022 struct ast_filestream *ast_writefile(const char *filename, const char *type, const char *comment, int flags, int check, mode_t mode)
01023 {
01024    int fd, myflags = 0;
01025    /* compiler claims this variable can be used before initialization... */
01026    FILE *bfile = NULL;
01027    struct ast_format *f;
01028    struct ast_filestream *fs = NULL;
01029    char *buf = NULL;
01030    size_t size = 0;
01031    int format_found = 0;
01032 
01033    AST_RWLIST_RDLOCK(&formats);
01034 
01035    /* set the O_TRUNC flag if and only if there is no O_APPEND specified */
01036    /* We really can't use O_APPEND as it will break WAV header updates */
01037    if (flags & O_APPEND) { 
01038       flags &= ~O_APPEND;
01039    } else {
01040       myflags = O_TRUNC;
01041    }
01042    
01043    myflags |= O_WRONLY | O_CREAT;
01044 
01045    /* XXX need to fix this - we should just do the fopen,
01046     * not open followed by fdopen()
01047     */
01048    AST_RWLIST_TRAVERSE(&formats, f, list) {
01049       char *fn, *orig_fn = NULL;
01050       if (fs)
01051          break;
01052 
01053       if (!exts_compare(f->exts, type))
01054          continue;
01055       else
01056          format_found = 1;
01057 
01058       fn = build_filename(filename, type);
01059       fd = open(fn, flags | myflags, mode);
01060       if (fd > -1) {
01061          /* fdopen() the resulting file stream */
01062          bfile = fdopen(fd, ((flags | myflags) & O_RDWR) ? "w+" : "w");
01063          if (!bfile) {
01064             ast_log(LOG_WARNING, "Whoa, fdopen failed: %s!\n", strerror(errno));
01065             close(fd);
01066             fd = -1;
01067          }
01068       }
01069       
01070       if (ast_opt_cache_record_files && (fd > -1)) {
01071          char *c;
01072 
01073          fclose(bfile); /* this also closes fd */
01074          /*
01075            We touch orig_fn just as a place-holder so other things (like vmail) see the file is there.
01076            What we are really doing is writing to record_cache_dir until we are done then we will mv the file into place.
01077          */
01078          orig_fn = ast_strdupa(fn);
01079          for (c = fn; *c; c++)
01080             if (*c == '/')
01081                *c = '_';
01082 
01083          size = strlen(fn) + strlen(record_cache_dir) + 2;
01084          buf = alloca(size);
01085          strcpy(buf, record_cache_dir);
01086          strcat(buf, "/");
01087          strcat(buf, fn);
01088          ast_free(fn);
01089          fn = buf;
01090          fd = open(fn, flags | myflags, mode);
01091          if (fd > -1) {
01092             /* fdopen() the resulting file stream */
01093             bfile = fdopen(fd, ((flags | myflags) & O_RDWR) ? "w+" : "w");
01094             if (!bfile) {
01095                ast_log(LOG_WARNING, "Whoa, fdopen failed: %s!\n", strerror(errno));
01096                close(fd);
01097                fd = -1;
01098             }
01099          }
01100       }
01101       if (fd > -1) {
01102          errno = 0;
01103          fs = get_filestream(f, bfile);
01104          if (!fs || rewrite_wrapper(fs, comment)) {
01105             ast_log(LOG_WARNING, "Unable to rewrite %s\n", fn);
01106             close(fd);
01107             if (orig_fn) {
01108                unlink(fn);
01109                unlink(orig_fn);
01110             }
01111             if (fs) {
01112                ast_closestream(fs);
01113                fs = NULL;
01114             }
01115             continue;
01116          }
01117          fs->trans = NULL;
01118          fs->fmt = f;
01119          fs->flags = flags;
01120          fs->mode = mode;
01121          if (orig_fn) {
01122             fs->realfilename = ast_strdup(orig_fn);
01123             fs->filename = ast_strdup(fn);
01124          } else {
01125             fs->realfilename = NULL;
01126             fs->filename = ast_strdup(filename);
01127          }
01128          fs->vfs = NULL;
01129          /* If truncated, we'll be at the beginning; if not truncated, then append */
01130          f->seek(fs, 0, SEEK_END);
01131       } else if (errno != EEXIST) {
01132          ast_log(LOG_WARNING, "Unable to open file %s: %s\n", fn, strerror(errno));
01133          if (orig_fn)
01134             unlink(orig_fn);
01135       }
01136       /* if buf != NULL then fn is already free and pointing to it */
01137       if (!buf)
01138          ast_free(fn);
01139    }
01140 
01141    AST_RWLIST_UNLOCK(&formats);
01142 
01143    if (!format_found)
01144       ast_log(LOG_WARNING, "No such format '%s'\n", type);
01145 
01146    return fs;
01147 }
01148 
01149 /*!
01150  * \brief the core of all waitstream() functions
01151  */
01152 static int waitstream_core(struct ast_channel *c, const char *breakon,
01153    const char *forward, const char *rewind, int skip_ms,
01154    int audiofd, int cmdfd,  const char *context)
01155 {
01156    const char *orig_chan_name = NULL;
01157    int err = 0;
01158 
01159    if (!breakon)
01160       breakon = "";
01161    if (!forward)
01162       forward = "";
01163    if (!rewind)
01164       rewind = "";
01165 
01166    /* Switch the channel to end DTMF frame only. waitstream_core doesn't care about the start of DTMF. */
01167    ast_set_flag(c, AST_FLAG_END_DTMF_ONLY);
01168 
01169    if (ast_test_flag(c, AST_FLAG_MASQ_NOSTREAM))
01170       orig_chan_name = ast_strdupa(c->name);
01171 
01172    while (c->stream) {
01173       int res;
01174       int ms;
01175 
01176       if (orig_chan_name && strcasecmp(orig_chan_name, c->name)) {
01177          ast_stopstream(c);
01178          err = 1;
01179          break;
01180       }
01181 
01182       ms = ast_sched_wait(c->sched);
01183 
01184       if (ms < 0 && !c->timingfunc) {
01185          ast_stopstream(c);
01186          break;
01187       }
01188       if (ms < 0)
01189          ms = 1000;
01190       if (cmdfd < 0) {
01191          res = ast_waitfor(c, ms);
01192          if (res < 0) {
01193             ast_log(LOG_WARNING, "Select failed (%s)\n", strerror(errno));
01194             ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01195             return res;
01196          }
01197       } else {
01198          int outfd;
01199          struct ast_channel *rchan = ast_waitfor_nandfds(&c, 1, &cmdfd, (cmdfd > -1) ? 1 : 0, NULL, &outfd, &ms);
01200          if (!rchan && (outfd < 0) && (ms)) {
01201             /* Continue */
01202             if (errno == EINTR)
01203                continue;
01204             ast_log(LOG_WARNING, "Wait failed (%s)\n", strerror(errno));
01205             ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01206             return -1;
01207          } else if (outfd > -1) { /* this requires cmdfd set */
01208             /* The FD we were watching has something waiting */
01209             ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01210             return 1;
01211          }
01212          /* if rchan is set, it is 'c' */
01213          res = rchan ? 1 : 0; /* map into 'res' values */
01214       }
01215       if (res > 0) {
01216          struct ast_frame *fr = ast_read(c);
01217          if (!fr) {
01218             ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01219             return -1;
01220          }
01221          switch (fr->frametype) {
01222          case AST_FRAME_DTMF_END:
01223             if (context) {
01224                const char exten[2] = { fr->subclass, '\0' };
01225                if (ast_exists_extension(c, context, exten, 1, c->cid.cid_num)) {
01226                   res = fr->subclass;
01227                   ast_frfree(fr);
01228                   ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01229                   return res;
01230                }
01231             } else {
01232                res = fr->subclass;
01233                if (strchr(forward, res)) {
01234                   int eoftest;
01235                   ast_stream_fastforward(c->stream, skip_ms);
01236                   eoftest = fgetc(c->stream->f);
01237                   if (feof(c->stream->f)) {
01238                      ast_stream_rewind(c->stream, skip_ms);
01239                   } else {
01240                      ungetc(eoftest, c->stream->f);
01241                   }
01242                } else if (strchr(rewind, res)) {
01243                   ast_stream_rewind(c->stream, skip_ms);
01244                } else if (strchr(breakon, res)) {
01245                   ast_frfree(fr);
01246                   ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01247                   return res;
01248                }              
01249             }
01250             break;
01251          case AST_FRAME_CONTROL:
01252             switch (fr->subclass) {
01253             case AST_CONTROL_HANGUP:
01254             case AST_CONTROL_BUSY:
01255             case AST_CONTROL_CONGESTION:
01256                ast_frfree(fr);
01257                ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01258                return -1;
01259             case AST_CONTROL_RINGING:
01260             case AST_CONTROL_ANSWER:
01261             case AST_CONTROL_VIDUPDATE:
01262             case AST_CONTROL_SRCUPDATE:
01263             case AST_CONTROL_HOLD:
01264             case AST_CONTROL_UNHOLD:
01265             case -1:
01266                /* Unimportant */
01267                break;
01268             default:
01269                ast_log(LOG_WARNING, "Unexpected control subclass '%d'\n", fr->subclass);
01270             }
01271             break;
01272          case AST_FRAME_VOICE:
01273             /* Write audio if appropriate */
01274             if (audiofd > -1) {
01275                if (write(audiofd, fr->data, fr->datalen) < 0) {
01276                   ast_log(LOG_WARNING, "write() failed: %s\n", strerror(errno));
01277                }
01278             }
01279          default:
01280             /* Ignore all others */
01281             break;
01282          }
01283          ast_frfree(fr);
01284       }
01285       ast_sched_runq(c->sched);
01286    }
01287 
01288    ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01289 
01290    return (err || c->_softhangup) ? -1 : 0;
01291 }
01292 
01293 int ast_waitstream_fr(struct ast_channel *c, const char *breakon, const char *forward, const char *rewind, int ms)
01294 {
01295    return waitstream_core(c, breakon, forward, rewind, ms,
01296       -1 /* no audiofd */, -1 /* no cmdfd */, NULL /* no context */);
01297 }
01298 
01299 int ast_waitstream(struct ast_channel *c, const char *breakon)
01300 {
01301    return waitstream_core(c, breakon, NULL, NULL, 0, -1, -1, NULL);
01302 }
01303 
01304 int ast_waitstream_full(struct ast_channel *c, const char *breakon, int audiofd, int cmdfd)
01305 {
01306    return waitstream_core(c, breakon, NULL, NULL, 0,
01307       audiofd, cmdfd, NULL /* no context */);
01308 }
01309 
01310 int ast_waitstream_exten(struct ast_channel *c, const char *context)
01311 {
01312    /* Waitstream, with return in the case of a valid 1 digit extension */
01313    /* in the current or specified context being pressed */
01314 
01315    if (!context)
01316       context = c->context;
01317    return waitstream_core(c, NULL, NULL, NULL, 0,
01318       -1, -1, context);
01319 }
01320 
01321 /*
01322  * if the file name is non-empty, try to play it.
01323  * Return 0 if success, -1 if error, digit if interrupted by a digit.
01324  * If digits == "" then we can simply check for non-zero.
01325  */
01326 int ast_stream_and_wait(struct ast_channel *chan, const char *file, const char *digits)
01327 {
01328    int res = 0;
01329    if (!ast_strlen_zero(file)) {
01330       res = ast_streamfile(chan, file, chan->language);
01331       if (!res) {
01332          res = ast_waitstream(chan, digits);
01333       }
01334    }
01335    return res;
01336 } 
01337 
01338 static char *handle_cli_core_show_file_formats(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
01339 {
01340 #define FORMAT "%-10s %-10s %-20s\n"
01341 #define FORMAT2 "%-10s %-10s %-20s\n"
01342    struct ast_format *f;
01343    int count_fmt = 0;
01344 
01345    switch (cmd) {
01346    case CLI_INIT:
01347       e->command = "core show file formats";
01348       e->usage =
01349          "Usage: core show file formats\n"
01350          "       Displays currently registered file formats (if any).\n";
01351       return NULL;
01352    case CLI_GENERATE:
01353       return NULL;
01354    }
01355 
01356    if (a->argc != 4)
01357       return CLI_SHOWUSAGE;
01358 
01359    ast_cli(a->fd, FORMAT, "Format", "Name", "Extensions");
01360    ast_cli(a->fd, FORMAT, "------", "----", "----------");
01361 
01362    AST_RWLIST_RDLOCK(&formats);
01363    AST_RWLIST_TRAVERSE(&formats, f, list) {
01364       ast_cli(a->fd, FORMAT2, ast_getformatname(f->format), f->name, f->exts);
01365       count_fmt++;
01366    }
01367    AST_RWLIST_UNLOCK(&formats);
01368    ast_cli(a->fd, "%d file formats registered.\n", count_fmt);
01369    return CLI_SUCCESS;
01370 #undef FORMAT
01371 #undef FORMAT2
01372 }
01373 
01374 struct ast_cli_entry cli_file[] = {
01375    AST_CLI_DEFINE(handle_cli_core_show_file_formats, "Displays file formats")
01376 };
01377 
01378 int ast_file_init(void)
01379 {
01380    ast_cli_register_multiple(cli_file, sizeof(cli_file) / sizeof(struct ast_cli_entry));
01381    return 0;
01382 }

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