Wed Apr 6 11:29:44 2011

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: 301446 $")
00029 
00030 #include <dirent.h>
00031 #include <sys/stat.h>
00032 #include <math.h>
00033 
00034 #include "asterisk/_private.h"   /* declare ast_file_init() */
00035 #include "asterisk/paths.h"   /* use ast_config_AST_DATA_DIR */
00036 #include "asterisk/mod_format.h"
00037 #include "asterisk/cli.h"
00038 #include "asterisk/channel.h"
00039 #include "asterisk/sched.h"
00040 #include "asterisk/translate.h"
00041 #include "asterisk/utils.h"
00042 #include "asterisk/lock.h"
00043 #include "asterisk/app.h"
00044 #include "asterisk/pbx.h"
00045 #include "asterisk/linkedlists.h"
00046 #include "asterisk/module.h"
00047 #include "asterisk/astobj2.h"
00048 #include "asterisk/test.h"
00049 
00050 /*
00051  * The following variable controls the layout of localized sound files.
00052  * If 0, use the historical layout with prefix just before the filename
00053  * (i.e. digits/en/1.gsm , digits/it/1.gsm or default to digits/1.gsm),
00054  * if 1 put the prefix at the beginning of the filename
00055  * (i.e. en/digits/1.gsm, it/digits/1.gsm or default to digits/1.gsm).
00056  * The latter permits a language to be entirely in one directory.
00057  */
00058 int ast_language_is_prefix = 1;
00059 
00060 static AST_RWLIST_HEAD_STATIC(formats, ast_format);
00061 
00062 int __ast_format_register(const struct ast_format *f, struct ast_module *mod)
00063 {
00064    struct ast_format *tmp;
00065 
00066    AST_RWLIST_WRLOCK(&formats);
00067    AST_RWLIST_TRAVERSE(&formats, tmp, list) {
00068       if (!strcasecmp(f->name, tmp->name)) {
00069          AST_RWLIST_UNLOCK(&formats);
00070          ast_log(LOG_WARNING, "Tried to register '%s' format, already registered\n", f->name);
00071          return -1;
00072       }
00073    }
00074    if (!(tmp = ast_calloc(1, sizeof(*tmp)))) {
00075       AST_RWLIST_UNLOCK(&formats);
00076       return -1;
00077    }
00078    *tmp = *f;
00079    tmp->module = mod;
00080    if (tmp->buf_size) {
00081       /*
00082        * Align buf_size properly, rounding up to the machine-specific
00083        * alignment for pointers.
00084        */
00085       struct _test_align { void *a, *b; } p;
00086       int align = (char *)&p.b - (char *)&p.a;
00087       tmp->buf_size = ((f->buf_size + align - 1) / align) * align;
00088    }
00089    
00090    memset(&tmp->list, 0, sizeof(tmp->list));
00091 
00092    AST_RWLIST_INSERT_HEAD(&formats, tmp, list);
00093    AST_RWLIST_UNLOCK(&formats);
00094    ast_verb(2, "Registered file format %s, extension(s) %s\n", f->name, f->exts);
00095 
00096    return 0;
00097 }
00098 
00099 int ast_format_unregister(const char *name)
00100 {
00101    struct ast_format *tmp;
00102    int res = -1;
00103 
00104    AST_RWLIST_WRLOCK(&formats);
00105    AST_RWLIST_TRAVERSE_SAFE_BEGIN(&formats, tmp, list) {
00106       if (!strcasecmp(name, tmp->name)) {
00107          AST_RWLIST_REMOVE_CURRENT(list);
00108          ast_free(tmp);
00109          res = 0;
00110       }
00111    }
00112    AST_RWLIST_TRAVERSE_SAFE_END;
00113    AST_RWLIST_UNLOCK(&formats);
00114 
00115    if (!res)
00116       ast_verb(2, "Unregistered format %s\n", name);
00117    else
00118       ast_log(LOG_WARNING, "Tried to unregister format %s, already unregistered\n", name);
00119 
00120    return res;
00121 }
00122 
00123 int ast_stopstream(struct ast_channel *tmp)
00124 {
00125    ast_channel_lock(tmp);
00126 
00127    /* Stop a running stream if there is one */
00128    if (tmp->stream) {
00129       ast_closestream(tmp->stream);
00130       tmp->stream = NULL;
00131       if (tmp->oldwriteformat && ast_set_write_format(tmp, tmp->oldwriteformat))
00132          ast_log(LOG_WARNING, "Unable to restore format back to %s\n", ast_getformatname(tmp->oldwriteformat));
00133    }
00134    /* Stop the video stream too */
00135    if (tmp->vstream != NULL) {
00136       ast_closestream(tmp->vstream);
00137       tmp->vstream = NULL;
00138    }
00139 
00140    ast_channel_unlock(tmp);
00141 
00142    return 0;
00143 }
00144 
00145 int ast_writestream(struct ast_filestream *fs, struct ast_frame *f)
00146 {
00147    int res = -1;
00148    int alt = 0;
00149    if (f->frametype == AST_FRAME_VIDEO) {
00150       if (fs->fmt->format & AST_FORMAT_AUDIO_MASK) {
00151          /* This is the audio portion.  Call the video one... */
00152          if (!fs->vfs && fs->filename) {
00153             const char *type = ast_getformatname(f->subclass.codec & ~0x1);
00154             fs->vfs = ast_writefile(fs->filename, type, NULL, fs->flags, 0, fs->mode);
00155             ast_debug(1, "Opened video output file\n");
00156          }
00157          if (fs->vfs)
00158             return ast_writestream(fs->vfs, f);
00159          /* else ignore */
00160          return 0;            
00161       } else {
00162          /* Might / might not have mark set */
00163          alt = 1;
00164       }
00165    } else if (f->frametype != AST_FRAME_VOICE) {
00166       ast_log(LOG_WARNING, "Tried to write non-voice frame\n");
00167       return -1;
00168    }
00169    if (((fs->fmt->format | alt) & f->subclass.codec) == f->subclass.codec) {
00170       res =  fs->fmt->write(fs, f);
00171       if (res < 0) 
00172          ast_log(LOG_WARNING, "Natural write failed\n");
00173       else if (res > 0)
00174          ast_log(LOG_WARNING, "Huh??\n");
00175    } else {
00176       /* XXX If they try to send us a type of frame that isn't the normal frame, and isn't
00177              the one we've setup a translator for, we do the "wrong thing" XXX */
00178       if (fs->trans && f->subclass.codec != fs->lastwriteformat) {
00179          ast_translator_free_path(fs->trans);
00180          fs->trans = NULL;
00181       }
00182       if (!fs->trans) 
00183          fs->trans = ast_translator_build_path(fs->fmt->format, f->subclass.codec);
00184       if (!fs->trans)
00185          ast_log(LOG_WARNING, "Unable to translate to format %s, source format %s\n",
00186             fs->fmt->name, ast_getformatname(f->subclass.codec));
00187       else {
00188          struct ast_frame *trf;
00189          fs->lastwriteformat = f->subclass.codec;
00190          /* Get the translated frame but don't consume the original in case they're using it on another stream */
00191          if ((trf = ast_translate(fs->trans, f, 0))) {
00192             struct ast_frame *cur;
00193 
00194             /* the translator may have returned multiple frames, so process them */
00195             for (cur = trf; cur; cur = AST_LIST_NEXT(cur, frame_list)) {
00196                if ((res = fs->fmt->write(fs, trf))) {
00197                   ast_log(LOG_WARNING, "Translated frame write failed\n");
00198                   break;
00199                }
00200             }
00201             ast_frfree(trf);
00202          } else {
00203             res = 0;
00204          }
00205       }
00206    }
00207    return res;
00208 }
00209 
00210 static int copy(const char *infile, const char *outfile)
00211 {
00212    int ifd, ofd, len;
00213    char buf[4096];   /* XXX make it lerger. */
00214 
00215    if ((ifd = open(infile, O_RDONLY)) < 0) {
00216       ast_log(LOG_WARNING, "Unable to open %s in read-only mode\n", infile);
00217       return -1;
00218    }
00219    if ((ofd = open(outfile, O_WRONLY | O_TRUNC | O_CREAT, AST_FILE_MODE)) < 0) {
00220       ast_log(LOG_WARNING, "Unable to open %s in write-only mode\n", outfile);
00221       close(ifd);
00222       return -1;
00223    }
00224    while ( (len = read(ifd, buf, sizeof(buf)) ) ) {
00225       int res;
00226       if (len < 0) {
00227          ast_log(LOG_WARNING, "Read failed on %s: %s\n", infile, strerror(errno));
00228          break;
00229       }
00230       /* XXX handle partial writes */
00231       res = write(ofd, buf, len);
00232       if (res != len) {
00233          ast_log(LOG_WARNING, "Write failed on %s (%d of %d): %s\n", outfile, res, len, strerror(errno));
00234          len = -1; /* error marker */
00235          break;
00236       }
00237    }
00238    close(ifd);
00239    close(ofd);
00240    if (len < 0) {
00241       unlink(outfile);
00242       return -1; /* error */
00243    }
00244    return 0;   /* success */
00245 }
00246 
00247 /*!
00248  * \brief construct a filename. Absolute pathnames are preserved,
00249  * relative names are prefixed by the sounds/ directory.
00250  * The wav49 suffix is replaced by 'WAV'.
00251  * Returns a malloc'ed string to be freed by the caller.
00252  */
00253 static char *build_filename(const char *filename, const char *ext)
00254 {
00255    char *fn = NULL;
00256 
00257    if (!strcmp(ext, "wav49"))
00258       ext = "WAV";
00259 
00260    if (filename[0] == '/') {
00261       if (asprintf(&fn, "%s.%s", filename, ext) < 0) {
00262          ast_log(LOG_WARNING, "asprintf() failed: %s\n", strerror(errno));
00263          fn = NULL;
00264       }
00265    } else {
00266       if (asprintf(&fn, "%s/sounds/%s.%s",
00267               ast_config_AST_DATA_DIR, filename, ext) < 0) {
00268          ast_log(LOG_WARNING, "asprintf() failed: %s\n", strerror(errno));
00269          fn = NULL;
00270       }
00271    }
00272    return fn;
00273 }
00274 
00275 /* compare type against the list 'exts' */
00276 /* XXX need a better algorithm */
00277 static int exts_compare(const char *exts, const char *type)
00278 {
00279    char tmp[256];
00280    char *stringp = tmp, *ext;
00281 
00282    ast_copy_string(tmp, exts, sizeof(tmp));
00283    while ((ext = strsep(&stringp, "|"))) {
00284       if (!strcmp(ext, type))
00285          return 1;
00286    }
00287 
00288    return 0;
00289 }
00290 
00291 static void filestream_destructor(void *arg)
00292 {
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          ast_settimeout(f->owner, 0, NULL, NULL);
00301       } else {
00302          f->owner->vstream = NULL;
00303          AST_SCHED_DEL(f->owner->sched, f->owner->vstreamid);
00304       }
00305    }
00306    /* destroy the translator on exit */
00307    if (f->trans)
00308       ast_translator_free_path(f->trans);
00309 
00310    if (f->realfilename && f->filename) {
00311       if (ast_safe_fork(0) == 0) {
00312          execl("/bin/mv", "mv", "-f", f->filename, f->realfilename, SENTINEL);
00313       }
00314    }
00315 
00316    if (f->filename)
00317       free(f->filename);
00318    if (f->realfilename)
00319       free(f->realfilename);
00320    if (f->fmt->close) {
00321       void (*closefn)(struct ast_filestream *) = f->fmt->close;
00322       closefn(f);
00323    }
00324    if (f->f)
00325       fclose(f->f);
00326    if (f->vfs)
00327       ast_closestream(f->vfs);
00328    if (f->write_buffer) {
00329       ast_free(f->write_buffer);
00330    }
00331    if (f->orig_chan_name)
00332       free((void *) f->orig_chan_name);
00333    ast_module_unref(f->fmt->module);
00334 }
00335 
00336 static struct ast_filestream *get_filestream(struct ast_format *fmt, FILE *bfile)
00337 {
00338    struct ast_filestream *s;
00339 
00340    int l = sizeof(*s) + fmt->buf_size + fmt->desc_size;  /* total allocation size */
00341    if ( (s = ao2_alloc(l, filestream_destructor)) == NULL)
00342       return NULL;
00343    s->fmt = fmt;
00344    s->f = bfile;
00345 
00346    if (fmt->desc_size)
00347       s->_private = ((char *)(s + 1)) + fmt->buf_size;
00348    if (fmt->buf_size)
00349       s->buf = (char *)(s + 1);
00350    s->fr.src = fmt->name;
00351    return s;
00352 }
00353 
00354 /*
00355  * Default implementations of open and rewrite.
00356  * Only use them if you don't have expensive stuff to do.
00357  */
00358 enum wrap_fn { WRAP_OPEN, WRAP_REWRITE };
00359 
00360 static int fn_wrapper(struct ast_filestream *s, const char *comment, enum wrap_fn mode)
00361 {
00362    struct ast_format *f = s->fmt;
00363    int ret = -1;
00364    int (*openfn)(struct ast_filestream *s);
00365 
00366    if (mode == WRAP_OPEN && (openfn = f->open) && openfn(s))
00367       ast_log(LOG_WARNING, "Unable to open format %s\n", f->name);
00368    else if (mode == WRAP_REWRITE && f->rewrite && f->rewrite(s, comment))
00369       ast_log(LOG_WARNING, "Unable to rewrite format %s\n", f->name);
00370    else {
00371       /* preliminary checks succeed. update usecount */
00372       ast_module_ref(f->module);
00373       ret = 0;
00374    }
00375    return ret;
00376 }
00377 
00378 static int rewrite_wrapper(struct ast_filestream *s, const char *comment)
00379 {
00380    return fn_wrapper(s, comment, WRAP_REWRITE);
00381 }
00382 
00383 static int open_wrapper(struct ast_filestream *s)
00384 {
00385    return fn_wrapper(s, NULL, WRAP_OPEN);
00386 }
00387 
00388 enum file_action {
00389    ACTION_EXISTS = 1, /* return matching format if file exists, 0 otherwise */
00390    ACTION_DELETE, /* delete file, return 0 on success, -1 on error */
00391    ACTION_RENAME, /* rename file. return 0 on success, -1 on error */
00392    ACTION_OPEN,
00393    ACTION_COPY /* copy file. return 0 on success, -1 on error */
00394 };
00395 
00396 /*!
00397  * \brief perform various actions on a file. Second argument
00398  * arg2 depends on the command:
00399  * unused for EXISTS and DELETE
00400  * destination file name (const char *) for COPY and RENAME
00401  *    struct ast_channel * for OPEN
00402  * if fmt is NULL, OPEN will return the first matching entry,
00403  * whereas other functions will run on all matching entries.
00404  */
00405 static format_t ast_filehelper(const char *filename, const void *arg2, const char *fmt, const enum file_action action)
00406 {
00407    struct ast_format *f;
00408    format_t res = (action == ACTION_EXISTS) ? 0 : -1;
00409 
00410    AST_RWLIST_RDLOCK(&formats);
00411    /* Check for a specific format */
00412    AST_RWLIST_TRAVERSE(&formats, f, list) {
00413       char *stringp, *ext = NULL;
00414 
00415       if (fmt && !exts_compare(f->exts, fmt))
00416          continue;
00417 
00418       /* Look for a file matching the supported extensions.
00419        * The file must exist, and for OPEN, must match
00420        * one of the formats supported by the channel.
00421        */
00422       stringp = ast_strdupa(f->exts);  /* this is in the stack so does not need to be freed */
00423       while ( (ext = strsep(&stringp, "|")) ) {
00424          struct stat st;
00425          char *fn = build_filename(filename, ext);
00426 
00427          if (fn == NULL)
00428             continue;
00429 
00430          if ( stat(fn, &st) ) { /* file not existent */
00431             ast_free(fn);
00432             continue;
00433          }
00434          /* for 'OPEN' we need to be sure that the format matches
00435           * what the channel can process
00436           */
00437          if (action == ACTION_OPEN) {
00438             struct ast_channel *chan = (struct ast_channel *)arg2;
00439             FILE *bfile;
00440             struct ast_filestream *s;
00441 
00442             if ( !(chan->writeformat & f->format) &&
00443                  !((f->format & AST_FORMAT_AUDIO_MASK && fmt) ||
00444                  (f->format & AST_FORMAT_VIDEO_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             if (st.st_size == 0) {
00464                ast_log(LOG_WARNING, "File %s detected to have zero size.\n", fn);
00465             }
00466             /* ok this is good for OPEN */
00467             res = 1; /* found */
00468             s->lasttimeout = -1;
00469             s->fmt = f;
00470             s->trans = NULL;
00471             s->filename = NULL;
00472             if (s->fmt->format & AST_FORMAT_AUDIO_MASK) {
00473                if (chan->stream)
00474                   ast_closestream(chan->stream);
00475                chan->stream = s;
00476             } else {
00477                if (chan->vstream)
00478                   ast_closestream(chan->vstream);
00479                chan->vstream = s;
00480             }
00481             ast_free(fn);
00482             break;
00483          }
00484          switch (action) {
00485          case ACTION_OPEN:
00486             break;   /* will never get here */
00487 
00488          case ACTION_EXISTS:  /* return the matching format */
00489             res |= f->format;
00490             break;
00491 
00492          case ACTION_DELETE:
00493             if ( (res = unlink(fn)) )
00494                ast_log(LOG_WARNING, "unlink(%s) failed: %s\n", fn, strerror(errno));
00495             break;
00496 
00497          case ACTION_RENAME:
00498          case ACTION_COPY: {
00499             char *nfn = build_filename((const char *)arg2, ext);
00500             if (!nfn)
00501                ast_log(LOG_WARNING, "Out of memory\n");
00502             else {
00503                res = action == ACTION_COPY ? copy(fn, nfn) : rename(fn, nfn);
00504                if (res)
00505                   ast_log(LOG_WARNING, "%s(%s,%s) failed: %s\n",
00506                      action == ACTION_COPY ? "copy" : "rename",
00507                       fn, nfn, strerror(errno));
00508                ast_free(nfn);
00509             }
00510              }
00511             break;
00512 
00513          default:
00514             ast_log(LOG_WARNING, "Unknown helper %d\n", action);
00515          }
00516          ast_free(fn);
00517       }
00518    }
00519    AST_RWLIST_UNLOCK(&formats);
00520    return res;
00521 }
00522 
00523 static int is_absolute_path(const char *filename)
00524 {
00525    return filename[0] == '/';
00526 }
00527 
00528 static format_t fileexists_test(const char *filename, const char *fmt, const char *lang,
00529             char *buf, int buflen)
00530 {
00531    if (buf == NULL) {
00532       return -1;
00533    }
00534 
00535    if (ast_language_is_prefix && !is_absolute_path(filename)) { /* new layout */
00536       if (lang) {
00537          snprintf(buf, buflen, "%s/%s", lang, filename);
00538       } else {
00539          snprintf(buf, buflen, "%s", filename);
00540       }
00541    } else { /* old layout */
00542       strcpy(buf, filename);  /* first copy the full string */
00543       if (lang) {
00544          /* insert the language and suffix if needed */
00545          const char *c = strrchr(filename, '/');
00546          int offset = c ? c - filename + 1 : 0; /* points right after the last '/' */
00547          snprintf(buf + offset, buflen - offset, "%s/%s", lang, filename + offset);
00548       }
00549    }
00550 
00551    return ast_filehelper(buf, NULL, fmt, ACTION_EXISTS);
00552 }
00553 
00554 /*!
00555  * \brief helper routine to locate a file with a given format
00556  * and language preference.
00557  * Try preflang, preflang with stripped '_' suffices, or NULL.
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 format_t fileexists_core(const char *filename, const char *fmt, const char *preflang,
00563             char *buf, int buflen)
00564 {
00565    format_t res = -1;
00566    char *lang;
00567 
00568    if (buf == NULL) {
00569       return -1;
00570    }
00571 
00572    /* We try languages in the following order:
00573     *    preflang (may include dialect and style codes)
00574     *    lang (preflang without dialect - if any)
00575     *    <none>
00576     *    default (unless the same as preflang or lang without dialect)
00577     */
00578 
00579    lang = ast_strdupa(preflang);
00580 
00581    /* Try preferred language, including removing any style or dialect codes */
00582    while (!ast_strlen_zero(lang)) {
00583       char *end;
00584 
00585       if ((res = fileexists_test(filename, fmt, lang, buf, buflen)) > 0) {
00586          return res;
00587       }
00588 
00589       if ((end = strrchr(lang, '_')) != NULL) {
00590          *end = '\0';
00591          continue;
00592       }
00593 
00594       break;
00595    }
00596 
00597    /* Try without any language */
00598    if ((res = fileexists_test(filename, fmt, NULL, buf, buflen)) > 0) {
00599       return res;
00600    }
00601 
00602    /* Finally try the default language unless it was already tried before */
00603    if ((ast_strlen_zero(preflang) || strcmp(preflang, DEFAULT_LANGUAGE)) && (ast_strlen_zero(lang) || strcmp(lang, DEFAULT_LANGUAGE))) {
00604       if ((res = fileexists_test(filename, fmt, DEFAULT_LANGUAGE, buf, buflen)) > 0) {
00605          return res;
00606       }
00607    }
00608 
00609    return 0;
00610 }
00611 
00612 struct ast_filestream *ast_openstream(struct ast_channel *chan, const char *filename, const char *preflang)
00613 {
00614    return ast_openstream_full(chan, filename, preflang, 0);
00615 }
00616 
00617 struct ast_filestream *ast_openstream_full(struct ast_channel *chan, const char *filename, const char *preflang, int asis)
00618 {
00619    /* 
00620     * Use fileexists_core() to find a file in a compatible
00621     * language and format, set up a suitable translator,
00622     * and open the stream.
00623     */
00624    format_t fmts, res;
00625    int 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    if (res == -1) {  /* No format available that works with this channel */
00651       return NULL;
00652    }
00653    res = ast_filehelper(buf, chan, NULL, ACTION_OPEN);
00654    if (res >= 0)
00655       return chan->stream;
00656    return NULL;
00657 }
00658 
00659 struct ast_filestream *ast_openvstream(struct ast_channel *chan, const char *filename, const char *preflang)
00660 {
00661    /* As above, but for video. But here we don't have translators
00662     * so we must enforce a format.
00663     */
00664    format_t format;
00665    char *buf;
00666    int buflen;
00667 
00668    if (preflang == NULL)
00669       preflang = "";
00670    buflen = strlen(preflang) + strlen(filename) + 4;
00671    buf = alloca(buflen);
00672    if (buf == NULL)
00673       return NULL;
00674 
00675    for (format = AST_FORMAT_AUDIO_MASK + 1; format <= AST_FORMAT_VIDEO_MASK; format = format << 1) {
00676       int fd;
00677       const char *fmt;
00678 
00679       if (!(chan->nativeformats & format))
00680          continue;
00681       fmt = ast_getformatname(format);
00682       if ( fileexists_core(filename, fmt, preflang, buf, buflen) < 1)   /* no valid format */
00683          continue;
00684       fd = ast_filehelper(buf, chan, fmt, ACTION_OPEN);
00685       if (fd >= 0)
00686          return chan->vstream;
00687       ast_log(LOG_WARNING, "File %s has video but couldn't be opened\n", filename);
00688    }
00689    return NULL;
00690 }
00691 
00692 static struct ast_frame *read_frame(struct ast_filestream *s, int *whennext)
00693 {
00694    struct ast_frame *fr, *new_fr;
00695 
00696    if (!s || !s->fmt) {
00697       return NULL;
00698    }
00699 
00700    if (!(fr = s->fmt->read(s, whennext))) {
00701       return NULL;
00702    }
00703 
00704    if (!(new_fr = ast_frisolate(fr))) {
00705       ast_frfree(fr);
00706       return NULL;
00707    }
00708 
00709    if (new_fr != fr) {
00710       ast_frfree(fr);
00711       fr = new_fr;
00712    }
00713 
00714    return fr;
00715 }
00716 
00717 struct ast_frame *ast_readframe(struct ast_filestream *s)
00718 {
00719    int whennext = 0;
00720 
00721    return read_frame(s, &whennext);
00722 }
00723 
00724 enum fsread_res {
00725    FSREAD_FAILURE,
00726    FSREAD_SUCCESS_SCHED,
00727    FSREAD_SUCCESS_NOSCHED,
00728 };
00729 
00730 static int ast_fsread_audio(const void *data);
00731 
00732 static enum fsread_res ast_readaudio_callback(struct ast_filestream *s)
00733 {
00734    int whennext = 0;
00735 
00736    while (!whennext) {
00737       struct ast_frame *fr;
00738 
00739       if (s->orig_chan_name && strcasecmp(s->owner->name, s->orig_chan_name)) {
00740          goto return_failure;
00741       }
00742 
00743       fr = read_frame(s, &whennext);
00744 
00745       if (!fr /* stream complete */ || ast_write(s->owner, fr) /* error writing */) {
00746          if (fr) {
00747             ast_log(LOG_WARNING, "Failed to write frame\n");
00748             ast_frfree(fr);
00749          }
00750          goto return_failure;
00751       } 
00752 
00753       if (fr) {
00754          ast_frfree(fr);
00755       }
00756    }
00757 
00758    if (whennext != s->lasttimeout) {
00759       if (s->owner->timingfd > -1) {
00760          float samp_rate = (float) ast_format_rate(s->fmt->format);
00761          unsigned int rate;
00762 
00763          rate = (unsigned int) roundf(samp_rate / ((float) whennext));
00764 
00765          ast_settimeout(s->owner, rate, ast_fsread_audio, s);
00766       } else {
00767          s->owner->streamid = ast_sched_add(s->owner->sched, 
00768             whennext / (ast_format_rate(s->fmt->format) / 1000), ast_fsread_audio, s);
00769       }
00770       s->lasttimeout = whennext;
00771       return FSREAD_SUCCESS_NOSCHED;
00772    }
00773    return FSREAD_SUCCESS_SCHED;
00774 
00775 return_failure:
00776    s->owner->streamid = -1;
00777    ast_settimeout(s->owner, 0, NULL, NULL);
00778    return FSREAD_FAILURE;
00779 }
00780 
00781 static int ast_fsread_audio(const void *data)
00782 {
00783    struct ast_filestream *fs = (struct ast_filestream *)data;
00784    enum fsread_res res;
00785 
00786    res = ast_readaudio_callback(fs);
00787 
00788    if (res == FSREAD_SUCCESS_SCHED)
00789       return 1;
00790    
00791    return 0;
00792 }
00793 
00794 static int ast_fsread_video(const void *data);
00795 
00796 static enum fsread_res ast_readvideo_callback(struct ast_filestream *s)
00797 {
00798    int whennext = 0;
00799 
00800    while (!whennext) {
00801       struct ast_frame *fr = read_frame(s, &whennext);
00802 
00803       if (!fr /* stream complete */ || ast_write(s->owner, fr) /* error writing */) {
00804          if (fr) {
00805             ast_log(LOG_WARNING, "Failed to write frame\n");
00806             ast_frfree(fr);
00807          }
00808          s->owner->vstreamid = -1;
00809          return FSREAD_FAILURE;
00810       }
00811 
00812       if (fr) {
00813          ast_frfree(fr);
00814       }
00815    }
00816 
00817    if (whennext != s->lasttimeout) {
00818       s->owner->vstreamid = ast_sched_add(s->owner->sched, 
00819          whennext / (ast_format_rate(s->fmt->format) / 1000), 
00820          ast_fsread_video, s);
00821       s->lasttimeout = whennext;
00822       return FSREAD_SUCCESS_NOSCHED;
00823    }
00824 
00825    return FSREAD_SUCCESS_SCHED;
00826 }
00827 
00828 static int ast_fsread_video(const void *data)
00829 {
00830    struct ast_filestream *fs = (struct ast_filestream *)data;
00831    enum fsread_res res;
00832 
00833    res = ast_readvideo_callback(fs);
00834 
00835    if (res == FSREAD_SUCCESS_SCHED)
00836       return 1;
00837    
00838    return 0;
00839 }
00840 
00841 int ast_applystream(struct ast_channel *chan, struct ast_filestream *s)
00842 {
00843    s->owner = chan;
00844    return 0;
00845 }
00846 
00847 int ast_playstream(struct ast_filestream *s)
00848 {
00849    enum fsread_res res;
00850 
00851    if (s->fmt->format & AST_FORMAT_AUDIO_MASK)
00852       res = ast_readaudio_callback(s);
00853    else
00854       res = ast_readvideo_callback(s);
00855 
00856    return (res == FSREAD_FAILURE) ? -1 : 0;
00857 }
00858 
00859 int ast_seekstream(struct ast_filestream *fs, off_t sample_offset, int whence)
00860 {
00861    return fs->fmt->seek(fs, sample_offset, whence);
00862 }
00863 
00864 int ast_truncstream(struct ast_filestream *fs)
00865 {
00866    return fs->fmt->trunc(fs);
00867 }
00868 
00869 off_t ast_tellstream(struct ast_filestream *fs)
00870 {
00871    return fs->fmt->tell(fs);
00872 }
00873 
00874 int ast_stream_fastforward(struct ast_filestream *fs, off_t ms)
00875 {
00876    return ast_seekstream(fs, ms * DEFAULT_SAMPLES_PER_MS, SEEK_CUR);
00877 }
00878 
00879 int ast_stream_rewind(struct ast_filestream *fs, off_t ms)
00880 {
00881    return ast_seekstream(fs, -ms * DEFAULT_SAMPLES_PER_MS, SEEK_CUR);
00882 }
00883 
00884 int ast_closestream(struct ast_filestream *f)
00885 {
00886    /* This used to destroy the filestream, but it now just decrements a refcount.
00887     * We need to force the stream to quit queuing frames now, because we might
00888     * change the writeformat, which could result in a subsequent write error, if
00889     * the format is different. */
00890 
00891    /* Stop a running stream if there is one */
00892    if (f->owner) {
00893       if (f->fmt->format < AST_FORMAT_AUDIO_MASK) {
00894          f->owner->stream = NULL;
00895          AST_SCHED_DEL(f->owner->sched, f->owner->streamid);
00896          ast_settimeout(f->owner, 0, NULL, NULL);
00897       } else {
00898          f->owner->vstream = NULL;
00899          AST_SCHED_DEL(f->owner->sched, f->owner->vstreamid);
00900       }
00901    }
00902 
00903    ao2_ref(f, -1);
00904    return 0;
00905 }
00906 
00907 
00908 /*
00909  * Look the various language-specific places where a file could exist.
00910  */
00911 int ast_fileexists(const char *filename, const char *fmt, const char *preflang)
00912 {
00913    char *buf;
00914    int buflen;
00915 
00916    if (preflang == NULL)
00917       preflang = "";
00918    buflen = strlen(preflang) + strlen(filename) + 4;  /* room for everything */
00919    buf = alloca(buflen);
00920    if (buf == NULL)
00921       return 0;
00922    return fileexists_core(filename, fmt, preflang, buf, buflen);
00923 }
00924 
00925 int ast_filedelete(const char *filename, const char *fmt)
00926 {
00927    return ast_filehelper(filename, NULL, fmt, ACTION_DELETE);
00928 }
00929 
00930 int ast_filerename(const char *filename, const char *filename2, const char *fmt)
00931 {
00932    return ast_filehelper(filename, filename2, fmt, ACTION_RENAME);
00933 }
00934 
00935 int ast_filecopy(const char *filename, const char *filename2, const char *fmt)
00936 {
00937    return ast_filehelper(filename, filename2, fmt, ACTION_COPY);
00938 }
00939 
00940 int ast_streamfile(struct ast_channel *chan, const char *filename, const char *preflang)
00941 {
00942    struct ast_filestream *fs;
00943    struct ast_filestream *vfs=NULL;
00944    char fmt[256];
00945    int seekattempt;
00946    int res;
00947 
00948    fs = ast_openstream(chan, filename, preflang);
00949    if (!fs) {
00950       ast_log(LOG_WARNING, "Unable to open %s (format %s): %s\n", filename, ast_getformatname_multiple(fmt, sizeof(fmt), chan->nativeformats), strerror(errno));
00951       return -1;
00952    }
00953 
00954    /* check to see if there is any data present (not a zero length file),
00955     * done this way because there is no where for ast_openstream_full to
00956     * return the file had no data. */
00957    seekattempt = fseek(fs->f, -1, SEEK_END);
00958    if (seekattempt && errno == EINVAL) {
00959       /* Zero-length file, as opposed to a pipe */
00960       return 0;
00961    } else {
00962       ast_seekstream(fs, 0, SEEK_SET);
00963    }
00964 
00965    vfs = ast_openvstream(chan, filename, preflang);
00966    if (vfs) {
00967       ast_debug(1, "Ooh, found a video stream, too, format %s\n", ast_getformatname(vfs->fmt->format));
00968    }
00969 
00970    if (ast_test_flag(chan, AST_FLAG_MASQ_NOSTREAM))
00971       fs->orig_chan_name = ast_strdup(chan->name);
00972    if (ast_applystream(chan, fs))
00973       return -1;
00974    if (vfs && ast_applystream(chan, vfs))
00975       return -1;
00976    res = ast_playstream(fs);
00977    if (!res && vfs)
00978       res = ast_playstream(vfs);
00979    ast_verb(3, "<%s> Playing '%s.%s' (language '%s')\n", chan->name, filename, ast_getformatname(chan->writeformat), preflang ? preflang : "default");
00980 
00981    return res;
00982 }
00983 
00984 struct ast_filestream *ast_readfile(const char *filename, const char *type, const char *comment, int flags, int check, mode_t mode)
00985 {
00986    FILE *bfile;
00987    struct ast_format *f;
00988    struct ast_filestream *fs = NULL;
00989    char *fn;
00990    int format_found = 0;   
00991 
00992    AST_RWLIST_RDLOCK(&formats);
00993 
00994    AST_RWLIST_TRAVERSE(&formats, f, list) {
00995       fs = NULL;
00996       if (!exts_compare(f->exts, type))
00997          continue;
00998       else 
00999          format_found = 1;
01000 
01001       fn = build_filename(filename, type);
01002       errno = 0;
01003       bfile = fopen(fn, "r");
01004 
01005       if (!bfile || (fs = get_filestream(f, bfile)) == NULL || open_wrapper(fs) ) {
01006          ast_log(LOG_WARNING, "Unable to open %s\n", fn);
01007          if (fs) {
01008             ast_closestream(fs);
01009          }
01010          fs = NULL;
01011          bfile = NULL;
01012          ast_free(fn);
01013          break;            
01014       }
01015       /* found it */
01016       fs->trans = NULL;
01017       fs->fmt = f;
01018       fs->flags = flags;
01019       fs->mode = mode;
01020       fs->filename = ast_strdup(filename);
01021       fs->vfs = NULL;
01022       break;
01023    }
01024 
01025    AST_RWLIST_UNLOCK(&formats);
01026    if (!format_found)
01027       ast_log(LOG_WARNING, "No such format '%s'\n", type);
01028 
01029    return fs;
01030 }
01031 
01032 struct ast_filestream *ast_writefile(const char *filename, const char *type, const char *comment, int flags, int check, mode_t mode)
01033 {
01034    int fd, myflags = 0;
01035    /* compiler claims this variable can be used before initialization... */
01036    FILE *bfile = NULL;
01037    struct ast_format *f;
01038    struct ast_filestream *fs = NULL;
01039    char *buf = NULL;
01040    size_t size = 0;
01041    int format_found = 0;
01042 
01043    AST_RWLIST_RDLOCK(&formats);
01044 
01045    /* set the O_TRUNC flag if and only if there is no O_APPEND specified */
01046    /* We really can't use O_APPEND as it will break WAV header updates */
01047    if (flags & O_APPEND) { 
01048       flags &= ~O_APPEND;
01049    } else {
01050       myflags = O_TRUNC;
01051    }
01052    
01053    myflags |= O_WRONLY | O_CREAT;
01054 
01055    /* XXX need to fix this - we should just do the fopen,
01056     * not open followed by fdopen()
01057     */
01058    AST_RWLIST_TRAVERSE(&formats, f, list) {
01059       char *fn, *orig_fn = NULL;
01060       if (fs)
01061          break;
01062 
01063       if (!exts_compare(f->exts, type))
01064          continue;
01065       else
01066          format_found = 1;
01067 
01068       fn = build_filename(filename, type);
01069       fd = open(fn, flags | myflags, mode);
01070       if (fd > -1) {
01071          /* fdopen() the resulting file stream */
01072          bfile = fdopen(fd, ((flags | myflags) & O_RDWR) ? "w+" : "w");
01073          if (!bfile) {
01074             ast_log(LOG_WARNING, "Whoa, fdopen failed: %s!\n", strerror(errno));
01075             close(fd);
01076             fd = -1;
01077          }
01078       }
01079       
01080       if (ast_opt_cache_record_files && (fd > -1)) {
01081          char *c;
01082 
01083          fclose(bfile); /* this also closes fd */
01084          /*
01085            We touch orig_fn just as a place-holder so other things (like vmail) see the file is there.
01086            What we are really doing is writing to record_cache_dir until we are done then we will mv the file into place.
01087          */
01088          orig_fn = ast_strdupa(fn);
01089          for (c = fn; *c; c++)
01090             if (*c == '/')
01091                *c = '_';
01092 
01093          size = strlen(fn) + strlen(record_cache_dir) + 2;
01094          buf = alloca(size);
01095          strcpy(buf, record_cache_dir);
01096          strcat(buf, "/");
01097          strcat(buf, fn);
01098          ast_free(fn);
01099          fn = buf;
01100          fd = open(fn, flags | myflags, mode);
01101          if (fd > -1) {
01102             /* fdopen() the resulting file stream */
01103             bfile = fdopen(fd, ((flags | myflags) & O_RDWR) ? "w+" : "w");
01104             if (!bfile) {
01105                ast_log(LOG_WARNING, "Whoa, fdopen failed: %s!\n", strerror(errno));
01106                close(fd);
01107                fd = -1;
01108             }
01109          }
01110       }
01111       if (fd > -1) {
01112          errno = 0;
01113          fs = get_filestream(f, bfile);
01114          if (!fs || rewrite_wrapper(fs, comment)) {
01115             ast_log(LOG_WARNING, "Unable to rewrite %s\n", fn);
01116             close(fd);
01117             if (orig_fn) {
01118                unlink(fn);
01119                unlink(orig_fn);
01120             }
01121             if (fs) {
01122                ast_closestream(fs);
01123                fs = NULL;
01124             }
01125             continue;
01126          }
01127          fs->trans = NULL;
01128          fs->fmt = f;
01129          fs->flags = flags;
01130          fs->mode = mode;
01131          if (orig_fn) {
01132             fs->realfilename = ast_strdup(orig_fn);
01133             fs->filename = ast_strdup(fn);
01134          } else {
01135             fs->realfilename = NULL;
01136             fs->filename = ast_strdup(filename);
01137          }
01138          fs->vfs = NULL;
01139          /* If truncated, we'll be at the beginning; if not truncated, then append */
01140 
01141          if ((fs->write_buffer = ast_malloc(32768))){
01142             setvbuf(fs->f, fs->write_buffer, _IOFBF, 32768);
01143          }
01144 
01145          f->seek(fs, 0, SEEK_END);
01146       } else if (errno != EEXIST) {
01147          ast_log(LOG_WARNING, "Unable to open file %s: %s\n", fn, strerror(errno));
01148          if (orig_fn)
01149             unlink(orig_fn);
01150       }
01151       /* if buf != NULL then fn is already free and pointing to it */
01152       if (!buf)
01153          ast_free(fn);
01154    }
01155 
01156    AST_RWLIST_UNLOCK(&formats);
01157 
01158    if (!format_found)
01159       ast_log(LOG_WARNING, "No such format '%s'\n", type);
01160 
01161    return fs;
01162 }
01163 
01164 /*!
01165  * \brief the core of all waitstream() functions
01166  */
01167 static int waitstream_core(struct ast_channel *c, const char *breakon,
01168    const char *forward, const char *reverse, int skip_ms,
01169    int audiofd, int cmdfd,  const char *context)
01170 {
01171    const char *orig_chan_name = NULL;
01172    int err = 0;
01173 
01174    if (!breakon)
01175       breakon = "";
01176    if (!forward)
01177       forward = "";
01178    if (!reverse)
01179       reverse = "";
01180 
01181    /* Switch the channel to end DTMF frame only. waitstream_core doesn't care about the start of DTMF. */
01182    ast_set_flag(c, AST_FLAG_END_DTMF_ONLY);
01183 
01184    if (ast_test_flag(c, AST_FLAG_MASQ_NOSTREAM))
01185       orig_chan_name = ast_strdupa(c->name);
01186 
01187    while (c->stream) {
01188       int res;
01189       int ms;
01190 
01191       if (orig_chan_name && strcasecmp(orig_chan_name, c->name)) {
01192          ast_stopstream(c);
01193          err = 1;
01194          break;
01195       }
01196 
01197       ms = ast_sched_wait(c->sched);
01198 
01199       if (ms < 0 && !c->timingfunc) {
01200          ast_stopstream(c);
01201          break;
01202       }
01203       if (ms < 0)
01204          ms = 1000;
01205       if (cmdfd < 0) {
01206          res = ast_waitfor(c, ms);
01207          if (res < 0) {
01208             ast_log(LOG_WARNING, "Select failed (%s)\n", strerror(errno));
01209             ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01210             return res;
01211          }
01212       } else {
01213          int outfd;
01214          struct ast_channel *rchan = ast_waitfor_nandfds(&c, 1, &cmdfd, (cmdfd > -1) ? 1 : 0, NULL, &outfd, &ms);
01215          if (!rchan && (outfd < 0) && (ms)) {
01216             /* Continue */
01217             if (errno == EINTR)
01218                continue;
01219             ast_log(LOG_WARNING, "Wait failed (%s)\n", strerror(errno));
01220             ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01221             return -1;
01222          } else if (outfd > -1) { /* this requires cmdfd set */
01223             /* The FD we were watching has something waiting */
01224             ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01225             return 1;
01226          }
01227          /* if rchan is set, it is 'c' */
01228          res = rchan ? 1 : 0; /* map into 'res' values */
01229       }
01230       if (res > 0) {
01231          struct ast_frame *fr = ast_read(c);
01232          if (!fr) {
01233             ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01234             return -1;
01235          }
01236          switch (fr->frametype) {
01237          case AST_FRAME_DTMF_END:
01238             if (context) {
01239                const char exten[2] = { fr->subclass.integer, '\0' };
01240                if (ast_exists_extension(c, context, exten, 1,
01241                   S_COR(c->caller.id.number.valid, c->caller.id.number.str, NULL))) {
01242                   res = fr->subclass.integer;
01243                   ast_frfree(fr);
01244                   ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01245                   return res;
01246                }
01247             } else {
01248                res = fr->subclass.integer;
01249                if (strchr(forward, res)) {
01250                   int eoftest;
01251                   ast_stream_fastforward(c->stream, skip_ms);
01252                   eoftest = fgetc(c->stream->f);
01253                   if (feof(c->stream->f)) {
01254                      ast_stream_rewind(c->stream, skip_ms);
01255                   } else {
01256                      ungetc(eoftest, c->stream->f);
01257                   }
01258                } else if (strchr(reverse, res)) {
01259                   ast_stream_rewind(c->stream, skip_ms);
01260                } else if (strchr(breakon, res)) {
01261                   ast_frfree(fr);
01262                   ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01263                   return res;
01264                }              
01265             }
01266             break;
01267          case AST_FRAME_CONTROL:
01268             switch (fr->subclass.integer) {
01269             case AST_CONTROL_HANGUP:
01270             case AST_CONTROL_BUSY:
01271             case AST_CONTROL_CONGESTION:
01272                ast_frfree(fr);
01273                ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01274                return -1;
01275             case AST_CONTROL_RINGING:
01276             case AST_CONTROL_ANSWER:
01277             case AST_CONTROL_VIDUPDATE:
01278             case AST_CONTROL_SRCUPDATE:
01279             case AST_CONTROL_SRCCHANGE:
01280             case AST_CONTROL_HOLD:
01281             case AST_CONTROL_UNHOLD:
01282             case AST_CONTROL_CONNECTED_LINE:
01283             case AST_CONTROL_REDIRECTING:
01284             case AST_CONTROL_AOC:
01285             case -1:
01286                /* Unimportant */
01287                break;
01288             default:
01289                ast_log(LOG_WARNING, "Unexpected control subclass '%d'\n", fr->subclass.integer);
01290             }
01291             break;
01292          case AST_FRAME_VOICE:
01293             /* Write audio if appropriate */
01294             if (audiofd > -1) {
01295                if (write(audiofd, fr->data.ptr, fr->datalen) < 0) {
01296                   ast_log(LOG_WARNING, "write() failed: %s\n", strerror(errno));
01297                }
01298             }
01299          default:
01300             /* Ignore all others */
01301             break;
01302          }
01303          ast_frfree(fr);
01304       }
01305       ast_sched_runq(c->sched);
01306    }
01307 
01308    ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01309 
01310    return (err || c->_softhangup) ? -1 : 0;
01311 }
01312 
01313 int ast_waitstream_fr(struct ast_channel *c, const char *breakon, const char *forward, const char *reverse, int ms)
01314 {
01315    return waitstream_core(c, breakon, forward, reverse, ms,
01316       -1 /* no audiofd */, -1 /* no cmdfd */, NULL /* no context */);
01317 }
01318 
01319 int ast_waitstream(struct ast_channel *c, const char *breakon)
01320 {
01321    return waitstream_core(c, breakon, NULL, NULL, 0, -1, -1, NULL);
01322 }
01323 
01324 int ast_waitstream_full(struct ast_channel *c, const char *breakon, int audiofd, int cmdfd)
01325 {
01326    return waitstream_core(c, breakon, NULL, NULL, 0,
01327       audiofd, cmdfd, NULL /* no context */);
01328 }
01329 
01330 int ast_waitstream_exten(struct ast_channel *c, const char *context)
01331 {
01332    /* Waitstream, with return in the case of a valid 1 digit extension */
01333    /* in the current or specified context being pressed */
01334 
01335    if (!context)
01336       context = c->context;
01337    return waitstream_core(c, NULL, NULL, NULL, 0,
01338       -1, -1, context);
01339 }
01340 
01341 /*
01342  * if the file name is non-empty, try to play it.
01343  * Return 0 if success, -1 if error, digit if interrupted by a digit.
01344  * If digits == "" then we can simply check for non-zero.
01345  */
01346 int ast_stream_and_wait(struct ast_channel *chan, const char *file, const char *digits)
01347 {
01348    int res = 0;
01349    if (!ast_strlen_zero(file)) {
01350       res = ast_streamfile(chan, file, chan->language);
01351       if (!res) {
01352          res = ast_waitstream(chan, digits);
01353       }
01354    }
01355    return res;
01356 } 
01357 
01358 char *ast_format_str_reduce(char *fmts)
01359 {
01360    struct ast_format *f;
01361    struct ast_format *fmts_ptr[AST_MAX_FORMATS];
01362    char *fmts_str[AST_MAX_FORMATS];
01363    char *stringp, *type;
01364    char *orig = fmts;
01365    int i, j, x, first, found = 0;
01366    int len = strlen(fmts) + 1;
01367    int res;
01368 
01369    if (AST_RWLIST_RDLOCK(&formats)) {
01370       ast_log(LOG_WARNING, "Unable to lock format list\n");
01371       return NULL;
01372    }
01373 
01374    stringp = ast_strdupa(fmts);
01375 
01376    for (x = 0; (type = strsep(&stringp, "|")) && x < AST_MAX_FORMATS; x++) {
01377       AST_RWLIST_TRAVERSE(&formats, f, list) {
01378          if (exts_compare(f->exts, type)) {
01379             found = 1;
01380             break;
01381          }
01382       }
01383 
01384       fmts_str[x] = type;
01385       if (found) {
01386          fmts_ptr[x] = f;
01387       } else {
01388          fmts_ptr[x] = NULL;
01389       }
01390    }
01391    AST_RWLIST_UNLOCK(&formats);
01392 
01393    first = 1;
01394    for (i = 0; i < x; i++) {
01395       /* ignore invalid entries */
01396       if (!fmts_ptr[i]) {
01397          ast_log(LOG_WARNING, "ignoring unknown format '%s'\n", fmts_str[i]);
01398          continue;
01399       }
01400 
01401       /* special handling for the first entry */
01402       if (first) {
01403          res = snprintf(fmts, len, "%s", fmts_str[i]);
01404          fmts += res;
01405          len -= res;
01406          first = 0;
01407          continue;
01408       }
01409 
01410       found = 0;
01411       for (j = 0; j < i; j++) {
01412          /* this is a duplicate */
01413          if (fmts_ptr[j] == fmts_ptr[i]) {
01414             found = 1;
01415             break;
01416          }
01417       }
01418 
01419       if (!found) {
01420          res = snprintf(fmts, len, "|%s", fmts_str[i]);
01421          fmts += res;
01422          len -= res;
01423       }
01424    }
01425 
01426    if (first) {
01427       ast_log(LOG_WARNING, "no known formats found in format list (%s)\n", orig);
01428       return NULL;
01429    }
01430 
01431    return orig;
01432 }
01433 
01434 static char *handle_cli_core_show_file_formats(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
01435 {
01436 #define FORMAT "%-10s %-10s %-20s\n"
01437 #define FORMAT2 "%-10s %-10s %-20s\n"
01438    struct ast_format *f;
01439    int count_fmt = 0;
01440 
01441    switch (cmd) {
01442    case CLI_INIT:
01443       e->command = "core show file formats";
01444       e->usage =
01445          "Usage: core show file formats\n"
01446          "       Displays currently registered file formats (if any).\n";
01447       return NULL;
01448    case CLI_GENERATE:
01449       return NULL;
01450    }
01451 
01452    if (a->argc != 4)
01453       return CLI_SHOWUSAGE;
01454 
01455    ast_cli(a->fd, FORMAT, "Format", "Name", "Extensions");
01456    ast_cli(a->fd, FORMAT, "------", "----", "----------");
01457 
01458    AST_RWLIST_RDLOCK(&formats);
01459    AST_RWLIST_TRAVERSE(&formats, f, list) {
01460       ast_cli(a->fd, FORMAT2, ast_getformatname(f->format), f->name, f->exts);
01461       count_fmt++;
01462    }
01463    AST_RWLIST_UNLOCK(&formats);
01464    ast_cli(a->fd, "%d file formats registered.\n", count_fmt);
01465    return CLI_SUCCESS;
01466 #undef FORMAT
01467 #undef FORMAT2
01468 }
01469 
01470 static struct ast_cli_entry cli_file[] = {
01471    AST_CLI_DEFINE(handle_cli_core_show_file_formats, "Displays file formats")
01472 };
01473 
01474 int ast_file_init(void)
01475 {
01476    ast_cli_register_multiple(cli_file, ARRAY_LEN(cli_file));
01477    return 0;
01478 }

Generated on Wed Apr 6 11:29:44 2011 for Asterisk - The Open Source Telephony Project by  doxygen 1.4.7