Mon Mar 19 11:30:27 2012

Asterisk developer's documentation


file.c

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00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * Copyright (C) 1999 - 2006, Digium, Inc.
00005  *
00006  * Mark Spencer <markster@digium.com>
00007  *
00008  * See http://www.asterisk.org for more information about
00009  * the Asterisk project. Please do not directly contact
00010  * any of the maintainers of this project for assistance;
00011  * the project provides a web site, mailing lists and IRC
00012  * channels for your use.
00013  *
00014  * This program is free software, distributed under the terms of
00015  * the GNU General Public License Version 2. See the LICENSE file
00016  * at the top of the source tree.
00017  */
00018 
00019 /*! \file
00020  *
00021  * \brief Generic File Format Support.
00022  *
00023  * \author Mark Spencer <markster@digium.com> 
00024  */
00025 
00026 #include "asterisk.h"
00027 
00028 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 349731 $")
00029 
00030 #include <dirent.h>
00031 #include <sys/stat.h>
00032 #include <sys/wait.h>
00033 #include <math.h>
00034 
00035 #include "asterisk/_private.h"   /* declare ast_file_init() */
00036 #include "asterisk/paths.h"   /* use ast_config_AST_DATA_DIR */
00037 #include "asterisk/mod_format.h"
00038 #include "asterisk/cli.h"
00039 #include "asterisk/channel.h"
00040 #include "asterisk/sched.h"
00041 #include "asterisk/translate.h"
00042 #include "asterisk/utils.h"
00043 #include "asterisk/lock.h"
00044 #include "asterisk/app.h"
00045 #include "asterisk/pbx.h"
00046 #include "asterisk/linkedlists.h"
00047 #include "asterisk/module.h"
00048 #include "asterisk/astobj2.h"
00049 #include "asterisk/test.h"
00050 
00051 /*
00052  * The following variable controls the layout of localized sound files.
00053  * If 0, use the historical layout with prefix just before the filename
00054  * (i.e. digits/en/1.gsm , digits/it/1.gsm or default to digits/1.gsm),
00055  * if 1 put the prefix at the beginning of the filename
00056  * (i.e. en/digits/1.gsm, it/digits/1.gsm or default to digits/1.gsm).
00057  * The latter permits a language to be entirely in one directory.
00058  */
00059 int ast_language_is_prefix = 1;
00060 
00061 static AST_RWLIST_HEAD_STATIC(formats, ast_format);
00062 
00063 int __ast_format_register(const struct ast_format *f, struct ast_module *mod)
00064 {
00065    struct ast_format *tmp;
00066 
00067    AST_RWLIST_WRLOCK(&formats);
00068    AST_RWLIST_TRAVERSE(&formats, tmp, list) {
00069       if (!strcasecmp(f->name, tmp->name)) {
00070          AST_RWLIST_UNLOCK(&formats);
00071          ast_log(LOG_WARNING, "Tried to register '%s' format, already registered\n", f->name);
00072          return -1;
00073       }
00074    }
00075    if (!(tmp = ast_calloc(1, sizeof(*tmp)))) {
00076       AST_RWLIST_UNLOCK(&formats);
00077       return -1;
00078    }
00079    *tmp = *f;
00080    tmp->module = mod;
00081    if (tmp->buf_size) {
00082       /*
00083        * Align buf_size properly, rounding up to the machine-specific
00084        * alignment for pointers.
00085        */
00086       struct _test_align { void *a, *b; } p;
00087       int align = (char *)&p.b - (char *)&p.a;
00088       tmp->buf_size = ((f->buf_size + align - 1) / align) * align;
00089    }
00090    
00091    memset(&tmp->list, 0, sizeof(tmp->list));
00092 
00093    AST_RWLIST_INSERT_HEAD(&formats, tmp, list);
00094    AST_RWLIST_UNLOCK(&formats);
00095    ast_verb(2, "Registered file format %s, extension(s) %s\n", f->name, f->exts);
00096 
00097    return 0;
00098 }
00099 
00100 int ast_format_unregister(const char *name)
00101 {
00102    struct ast_format *tmp;
00103    int res = -1;
00104 
00105    AST_RWLIST_WRLOCK(&formats);
00106    AST_RWLIST_TRAVERSE_SAFE_BEGIN(&formats, tmp, list) {
00107       if (!strcasecmp(name, tmp->name)) {
00108          AST_RWLIST_REMOVE_CURRENT(list);
00109          ast_free(tmp);
00110          res = 0;
00111       }
00112    }
00113    AST_RWLIST_TRAVERSE_SAFE_END;
00114    AST_RWLIST_UNLOCK(&formats);
00115 
00116    if (!res)
00117       ast_verb(2, "Unregistered format %s\n", name);
00118    else
00119       ast_log(LOG_WARNING, "Tried to unregister format %s, already unregistered\n", name);
00120 
00121    return res;
00122 }
00123 
00124 int ast_stopstream(struct ast_channel *tmp)
00125 {
00126    ast_channel_lock(tmp);
00127 
00128    /* Stop a running stream if there is one */
00129    if (tmp->stream) {
00130       ast_closestream(tmp->stream);
00131       tmp->stream = NULL;
00132       if (tmp->oldwriteformat && ast_set_write_format(tmp, tmp->oldwriteformat))
00133          ast_log(LOG_WARNING, "Unable to restore format back to %s\n", ast_getformatname(tmp->oldwriteformat));
00134    }
00135    /* Stop the video stream too */
00136    if (tmp->vstream != NULL) {
00137       ast_closestream(tmp->vstream);
00138       tmp->vstream = NULL;
00139    }
00140 
00141    ast_channel_unlock(tmp);
00142 
00143    return 0;
00144 }
00145 
00146 int ast_writestream(struct ast_filestream *fs, struct ast_frame *f)
00147 {
00148    int res = -1;
00149    int alt = 0;
00150    if (f->frametype == AST_FRAME_VIDEO) {
00151       if (fs->fmt->format & AST_FORMAT_AUDIO_MASK) {
00152          /* This is the audio portion.  Call the video one... */
00153          if (!fs->vfs && fs->filename) {
00154             const char *type = ast_getformatname(f->subclass.codec & ~0x1);
00155             fs->vfs = ast_writefile(fs->filename, type, NULL, fs->flags, 0, fs->mode);
00156             ast_debug(1, "Opened video output file\n");
00157          }
00158          if (fs->vfs)
00159             return ast_writestream(fs->vfs, f);
00160          /* else ignore */
00161          return 0;            
00162       } else {
00163          /* Might / might not have mark set */
00164          alt = 1;
00165       }
00166    } else if (f->frametype != AST_FRAME_VOICE) {
00167       ast_log(LOG_WARNING, "Tried to write non-voice frame\n");
00168       return -1;
00169    }
00170    if (((fs->fmt->format | alt) & f->subclass.codec) == f->subclass.codec) {
00171       res =  fs->fmt->write(fs, f);
00172       if (res < 0) 
00173          ast_log(LOG_WARNING, "Natural write failed\n");
00174       else if (res > 0)
00175          ast_log(LOG_WARNING, "Huh??\n");
00176    } else {
00177       /* XXX If they try to send us a type of frame that isn't the normal frame, and isn't
00178              the one we've setup a translator for, we do the "wrong thing" XXX */
00179       if (fs->trans && f->subclass.codec != fs->lastwriteformat) {
00180          ast_translator_free_path(fs->trans);
00181          fs->trans = NULL;
00182       }
00183       if (!fs->trans) 
00184          fs->trans = ast_translator_build_path(fs->fmt->format, f->subclass.codec);
00185       if (!fs->trans)
00186          ast_log(LOG_WARNING, "Unable to translate to format %s, source format %s\n",
00187             fs->fmt->name, ast_getformatname(f->subclass.codec));
00188       else {
00189          struct ast_frame *trf;
00190          fs->lastwriteformat = f->subclass.codec;
00191          /* Get the translated frame but don't consume the original in case they're using it on another stream */
00192          if ((trf = ast_translate(fs->trans, f, 0))) {
00193             struct ast_frame *cur;
00194 
00195             /* the translator may have returned multiple frames, so process them */
00196             for (cur = trf; cur; cur = AST_LIST_NEXT(cur, frame_list)) {
00197                if ((res = fs->fmt->write(fs, trf))) {
00198                   ast_log(LOG_WARNING, "Translated frame write failed\n");
00199                   break;
00200                }
00201             }
00202             ast_frfree(trf);
00203          } else {
00204             res = 0;
00205          }
00206       }
00207    }
00208    return res;
00209 }
00210 
00211 static int copy(const char *infile, const char *outfile)
00212 {
00213    int ifd, ofd, len;
00214    char buf[4096];   /* XXX make it lerger. */
00215 
00216    if ((ifd = open(infile, O_RDONLY)) < 0) {
00217       ast_log(LOG_WARNING, "Unable to open %s in read-only mode\n", infile);
00218       return -1;
00219    }
00220    if ((ofd = open(outfile, O_WRONLY | O_TRUNC | O_CREAT, AST_FILE_MODE)) < 0) {
00221       ast_log(LOG_WARNING, "Unable to open %s in write-only mode\n", outfile);
00222       close(ifd);
00223       return -1;
00224    }
00225    while ( (len = read(ifd, buf, sizeof(buf)) ) ) {
00226       int res;
00227       if (len < 0) {
00228          ast_log(LOG_WARNING, "Read failed on %s: %s\n", infile, strerror(errno));
00229          break;
00230       }
00231       /* XXX handle partial writes */
00232       res = write(ofd, buf, len);
00233       if (res != len) {
00234          ast_log(LOG_WARNING, "Write failed on %s (%d of %d): %s\n", outfile, res, len, strerror(errno));
00235          len = -1; /* error marker */
00236          break;
00237       }
00238    }
00239    close(ifd);
00240    close(ofd);
00241    if (len < 0) {
00242       unlink(outfile);
00243       return -1; /* error */
00244    }
00245    return 0;   /* success */
00246 }
00247 
00248 /*!
00249  * \brief construct a filename. Absolute pathnames are preserved,
00250  * relative names are prefixed by the sounds/ directory.
00251  * The wav49 suffix is replaced by 'WAV'.
00252  * Returns a malloc'ed string to be freed by the caller.
00253  */
00254 static char *build_filename(const char *filename, const char *ext)
00255 {
00256    char *fn = NULL;
00257 
00258    if (!strcmp(ext, "wav49"))
00259       ext = "WAV";
00260 
00261    if (filename[0] == '/') {
00262       if (asprintf(&fn, "%s.%s", filename, ext) < 0) {
00263          ast_log(LOG_WARNING, "asprintf() failed: %s\n", strerror(errno));
00264          fn = NULL;
00265       }
00266    } else {
00267       if (asprintf(&fn, "%s/sounds/%s.%s",
00268               ast_config_AST_DATA_DIR, filename, ext) < 0) {
00269          ast_log(LOG_WARNING, "asprintf() failed: %s\n", strerror(errno));
00270          fn = NULL;
00271       }
00272    }
00273    return fn;
00274 }
00275 
00276 /* compare type against the list 'exts' */
00277 /* XXX need a better algorithm */
00278 static int exts_compare(const char *exts, const char *type)
00279 {
00280    char tmp[256];
00281    char *stringp = tmp, *ext;
00282 
00283    ast_copy_string(tmp, exts, sizeof(tmp));
00284    while ((ext = strsep(&stringp, "|"))) {
00285       if (!strcmp(ext, type))
00286          return 1;
00287    }
00288 
00289    return 0;
00290 }
00291 
00292 /*! \internal \brief Close the file stream by canceling any pending read / write callbacks */
00293 static void filestream_close(struct ast_filestream *f)
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 if (f->fmt->format & AST_FORMAT_VIDEO_MASK) {
00302          f->owner->vstream = NULL;
00303          AST_SCHED_DEL(f->owner->sched, f->owner->vstreamid);
00304       } else {
00305          ast_log(AST_LOG_WARNING, "Unable to schedule deletion of filestream with unsupported type %s\n", f->fmt->name);
00306       }
00307    }
00308 }
00309 
00310 static void filestream_destructor(void *arg)
00311 {
00312    struct ast_filestream *f = arg;
00313    int status;
00314    int pid = -1;
00315 
00316    /* Stop a running stream if there is one */
00317    filestream_close(f);
00318 
00319    /* destroy the translator on exit */
00320    if (f->trans)
00321       ast_translator_free_path(f->trans);
00322 
00323    if (f->realfilename && f->filename) {
00324       pid = ast_safe_fork(0);
00325       if (!pid) {
00326          execl("/bin/mv", "mv", "-f", f->filename, f->realfilename, SENTINEL);
00327          _exit(1);
00328       }
00329       else if (pid > 0) {
00330          /* Block the parent until the move is complete.*/
00331          waitpid(pid, &status, 0);
00332       }
00333    }
00334 
00335    if (f->filename)
00336       free(f->filename);
00337    if (f->realfilename)
00338       free(f->realfilename);
00339    if (f->fmt->close) {
00340       void (*closefn)(struct ast_filestream *) = f->fmt->close;
00341       closefn(f);
00342    }
00343    if (f->f)
00344       fclose(f->f);
00345    if (f->vfs)
00346       ast_closestream(f->vfs);
00347    if (f->write_buffer) {
00348       ast_free(f->write_buffer);
00349    }
00350    if (f->orig_chan_name)
00351       free((void *) f->orig_chan_name);
00352    ast_module_unref(f->fmt->module);
00353 }
00354 
00355 static struct ast_filestream *get_filestream(struct ast_format *fmt, FILE *bfile)
00356 {
00357    struct ast_filestream *s;
00358 
00359    int l = sizeof(*s) + fmt->buf_size + fmt->desc_size;  /* total allocation size */
00360    if ( (s = ao2_alloc(l, filestream_destructor)) == NULL)
00361       return NULL;
00362    s->fmt = fmt;
00363    s->f = bfile;
00364 
00365    if (fmt->desc_size)
00366       s->_private = ((char *)(s + 1)) + fmt->buf_size;
00367    if (fmt->buf_size)
00368       s->buf = (char *)(s + 1);
00369    s->fr.src = fmt->name;
00370    return s;
00371 }
00372 
00373 /*
00374  * Default implementations of open and rewrite.
00375  * Only use them if you don't have expensive stuff to do.
00376  */
00377 enum wrap_fn { WRAP_OPEN, WRAP_REWRITE };
00378 
00379 static int fn_wrapper(struct ast_filestream *s, const char *comment, enum wrap_fn mode)
00380 {
00381    struct ast_format *f = s->fmt;
00382    int ret = -1;
00383    int (*openfn)(struct ast_filestream *s);
00384 
00385    if (mode == WRAP_OPEN && (openfn = f->open) && openfn(s))
00386       ast_log(LOG_WARNING, "Unable to open format %s\n", f->name);
00387    else if (mode == WRAP_REWRITE && f->rewrite && f->rewrite(s, comment))
00388       ast_log(LOG_WARNING, "Unable to rewrite format %s\n", f->name);
00389    else {
00390       /* preliminary checks succeed. update usecount */
00391       ast_module_ref(f->module);
00392       ret = 0;
00393    }
00394    return ret;
00395 }
00396 
00397 static int rewrite_wrapper(struct ast_filestream *s, const char *comment)
00398 {
00399    return fn_wrapper(s, comment, WRAP_REWRITE);
00400 }
00401 
00402 static int open_wrapper(struct ast_filestream *s)
00403 {
00404    return fn_wrapper(s, NULL, WRAP_OPEN);
00405 }
00406 
00407 enum file_action {
00408    ACTION_EXISTS = 1, /* return matching format if file exists, 0 otherwise */
00409    ACTION_DELETE, /* delete file, return 0 on success, -1 on error */
00410    ACTION_RENAME, /* rename file. return 0 on success, -1 on error */
00411    ACTION_OPEN,
00412    ACTION_COPY /* copy file. return 0 on success, -1 on error */
00413 };
00414 
00415 /*!
00416  * \brief perform various actions on a file. Second argument
00417  * arg2 depends on the command:
00418  * unused for EXISTS and DELETE
00419  * destination file name (const char *) for COPY and RENAME
00420  *    struct ast_channel * for OPEN
00421  * if fmt is NULL, OPEN will return the first matching entry,
00422  * whereas other functions will run on all matching entries.
00423  */
00424 static format_t ast_filehelper(const char *filename, const void *arg2, const char *fmt, const enum file_action action)
00425 {
00426    struct ast_format *f;
00427    format_t res = (action == ACTION_EXISTS) ? 0 : -1;
00428 
00429    AST_RWLIST_RDLOCK(&formats);
00430    /* Check for a specific format */
00431    AST_RWLIST_TRAVERSE(&formats, f, list) {
00432       char *stringp, *ext = NULL;
00433 
00434       if (fmt && !exts_compare(f->exts, fmt))
00435          continue;
00436 
00437       /* Look for a file matching the supported extensions.
00438        * The file must exist, and for OPEN, must match
00439        * one of the formats supported by the channel.
00440        */
00441       stringp = ast_strdupa(f->exts);  /* this is in the stack so does not need to be freed */
00442       while ( (ext = strsep(&stringp, "|")) ) {
00443          struct stat st;
00444          char *fn = build_filename(filename, ext);
00445 
00446          if (fn == NULL)
00447             continue;
00448 
00449          if ( stat(fn, &st) ) { /* file not existent */
00450             ast_free(fn);
00451             continue;
00452          }
00453          /* for 'OPEN' we need to be sure that the format matches
00454           * what the channel can process
00455           */
00456          if (action == ACTION_OPEN) {
00457             struct ast_channel *chan = (struct ast_channel *)arg2;
00458             FILE *bfile;
00459             struct ast_filestream *s;
00460 
00461             if ( !(chan->writeformat & f->format) &&
00462                  !((f->format & AST_FORMAT_AUDIO_MASK && fmt) ||
00463                  (f->format & AST_FORMAT_VIDEO_MASK && fmt))) {
00464                ast_free(fn);
00465                continue;   /* not a supported format */
00466             }
00467             if ( (bfile = fopen(fn, "r")) == NULL) {
00468                ast_free(fn);
00469                continue;   /* cannot open file */
00470             }
00471             s = get_filestream(f, bfile);
00472             if (!s) {
00473                fclose(bfile);
00474                ast_free(fn);  /* cannot allocate descriptor */
00475                continue;
00476             }
00477             if (open_wrapper(s)) {
00478                ast_free(fn);
00479                ast_closestream(s);
00480                continue;   /* cannot run open on file */
00481             }
00482             if (st.st_size == 0) {
00483                ast_log(LOG_WARNING, "File %s detected to have zero size.\n", fn);
00484             }
00485             /* ok this is good for OPEN */
00486             res = 1; /* found */
00487             s->lasttimeout = -1;
00488             s->fmt = f;
00489             s->trans = NULL;
00490             s->filename = NULL;
00491             if (s->fmt->format & AST_FORMAT_AUDIO_MASK) {
00492                if (chan->stream)
00493                   ast_closestream(chan->stream);
00494                chan->stream = s;
00495             } else {
00496                if (chan->vstream)
00497                   ast_closestream(chan->vstream);
00498                chan->vstream = s;
00499             }
00500             ast_free(fn);
00501             break;
00502          }
00503          switch (action) {
00504          case ACTION_OPEN:
00505             break;   /* will never get here */
00506 
00507          case ACTION_EXISTS:  /* return the matching format */
00508             res |= f->format;
00509             break;
00510 
00511          case ACTION_DELETE:
00512             if ( (res = unlink(fn)) )
00513                ast_log(LOG_WARNING, "unlink(%s) failed: %s\n", fn, strerror(errno));
00514             break;
00515 
00516          case ACTION_RENAME:
00517          case ACTION_COPY: {
00518             char *nfn = build_filename((const char *)arg2, ext);
00519             if (!nfn)
00520                ast_log(LOG_WARNING, "Out of memory\n");
00521             else {
00522                res = action == ACTION_COPY ? copy(fn, nfn) : rename(fn, nfn);
00523                if (res)
00524                   ast_log(LOG_WARNING, "%s(%s,%s) failed: %s\n",
00525                      action == ACTION_COPY ? "copy" : "rename",
00526                       fn, nfn, strerror(errno));
00527                ast_free(nfn);
00528             }
00529              }
00530             break;
00531 
00532          default:
00533             ast_log(LOG_WARNING, "Unknown helper %d\n", action);
00534          }
00535          ast_free(fn);
00536       }
00537    }
00538    AST_RWLIST_UNLOCK(&formats);
00539    return res;
00540 }
00541 
00542 static int is_absolute_path(const char *filename)
00543 {
00544    return filename[0] == '/';
00545 }
00546 
00547 static format_t fileexists_test(const char *filename, const char *fmt, const char *lang,
00548             char *buf, int buflen)
00549 {
00550    if (buf == NULL) {
00551       return -1;
00552    }
00553 
00554    if (ast_language_is_prefix && !is_absolute_path(filename)) { /* new layout */
00555       if (lang) {
00556          snprintf(buf, buflen, "%s/%s", lang, filename);
00557       } else {
00558          snprintf(buf, buflen, "%s", filename);
00559       }
00560    } else { /* old layout */
00561       strcpy(buf, filename);  /* first copy the full string */
00562       if (lang) {
00563          /* insert the language and suffix if needed */
00564          const char *c = strrchr(filename, '/');
00565          int offset = c ? c - filename + 1 : 0; /* points right after the last '/' */
00566          snprintf(buf + offset, buflen - offset, "%s/%s", lang, filename + offset);
00567       }
00568    }
00569 
00570    return ast_filehelper(buf, NULL, fmt, ACTION_EXISTS);
00571 }
00572 
00573 /*!
00574  * \brief helper routine to locate a file with a given format
00575  * and language preference.
00576  * Try preflang, preflang with stripped '_' suffices, or NULL.
00577  *
00578  * The last parameter(s) point to a buffer of sufficient size,
00579  * which on success is filled with the matching filename.
00580  */
00581 static format_t fileexists_core(const char *filename, const char *fmt, const char *preflang,
00582             char *buf, int buflen)
00583 {
00584    format_t res = -1;
00585    char *lang;
00586 
00587    if (buf == NULL) {
00588       return -1;
00589    }
00590 
00591    /* We try languages in the following order:
00592     *    preflang (may include dialect and style codes)
00593     *    lang (preflang without dialect - if any)
00594     *    <none>
00595     *    default (unless the same as preflang or lang without dialect)
00596     */
00597 
00598    lang = ast_strdupa(preflang);
00599 
00600    /* Try preferred language, including removing any style or dialect codes */
00601    while (!ast_strlen_zero(lang)) {
00602       char *end;
00603 
00604       if ((res = fileexists_test(filename, fmt, lang, buf, buflen)) > 0) {
00605          return res;
00606       }
00607 
00608       if ((end = strrchr(lang, '_')) != NULL) {
00609          *end = '\0';
00610          continue;
00611       }
00612 
00613       break;
00614    }
00615 
00616    /* Try without any language */
00617    if ((res = fileexists_test(filename, fmt, NULL, buf, buflen)) > 0) {
00618       return res;
00619    }
00620 
00621    /* Finally try the default language unless it was already tried before */
00622    if ((ast_strlen_zero(preflang) || strcmp(preflang, DEFAULT_LANGUAGE)) && (ast_strlen_zero(lang) || strcmp(lang, DEFAULT_LANGUAGE))) {
00623       if ((res = fileexists_test(filename, fmt, DEFAULT_LANGUAGE, buf, buflen)) > 0) {
00624          return res;
00625       }
00626    }
00627 
00628    return 0;
00629 }
00630 
00631 struct ast_filestream *ast_openstream(struct ast_channel *chan, const char *filename, const char *preflang)
00632 {
00633    return ast_openstream_full(chan, filename, preflang, 0);
00634 }
00635 
00636 struct ast_filestream *ast_openstream_full(struct ast_channel *chan, const char *filename, const char *preflang, int asis)
00637 {
00638    /* 
00639     * Use fileexists_core() to find a file in a compatible
00640     * language and format, set up a suitable translator,
00641     * and open the stream.
00642     */
00643    format_t fmts, res;
00644    int buflen;
00645    char *buf;
00646 
00647    if (!asis) {
00648       /* do this first, otherwise we detect the wrong writeformat */
00649       ast_stopstream(chan);
00650       if (chan->generator)
00651          ast_deactivate_generator(chan);
00652    }
00653    if (preflang == NULL)
00654       preflang = "";
00655    buflen = strlen(preflang) + strlen(filename) + 4;
00656    buf = alloca(buflen);
00657    if (buf == NULL)
00658       return NULL;
00659    fmts = fileexists_core(filename, NULL, preflang, buf, buflen);
00660    if (fmts > 0)
00661       fmts &= AST_FORMAT_AUDIO_MASK;
00662    if (fmts < 1) {
00663       ast_log(LOG_WARNING, "File %s does not exist in any format\n", filename);
00664       return NULL;
00665    }
00666    chan->oldwriteformat = chan->writeformat;
00667    /* Set the channel to a format we can work with */
00668    res = ast_set_write_format(chan, fmts);
00669    if (res == -1) {  /* No format available that works with this channel */
00670       return NULL;
00671    }
00672    res = ast_filehelper(buf, chan, NULL, ACTION_OPEN);
00673    if (res >= 0)
00674       return chan->stream;
00675    return NULL;
00676 }
00677 
00678 struct ast_filestream *ast_openvstream(struct ast_channel *chan, const char *filename, const char *preflang)
00679 {
00680    /* As above, but for video. But here we don't have translators
00681     * so we must enforce a format.
00682     */
00683    format_t format;
00684    char *buf;
00685    int buflen;
00686 
00687    if (preflang == NULL)
00688       preflang = "";
00689    buflen = strlen(preflang) + strlen(filename) + 4;
00690    buf = alloca(buflen);
00691    if (buf == NULL)
00692       return NULL;
00693 
00694    for (format = AST_FORMAT_FIRST_VIDEO_BIT; format <= AST_FORMAT_VIDEO_MASK; format = format << 1) {
00695       int fd;
00696       const char *fmt;
00697 
00698       if (!(chan->nativeformats & format))
00699          continue;
00700       fmt = ast_getformatname(format);
00701       if ( fileexists_core(filename, fmt, preflang, buf, buflen) < 1)   /* no valid format */
00702          continue;
00703       fd = ast_filehelper(buf, chan, fmt, ACTION_OPEN);
00704       if (fd >= 0)
00705          return chan->vstream;
00706       ast_log(LOG_WARNING, "File %s has video but couldn't be opened\n", filename);
00707    }
00708    return NULL;
00709 }
00710 
00711 static struct ast_frame *read_frame(struct ast_filestream *s, int *whennext)
00712 {
00713    struct ast_frame *fr, *new_fr;
00714 
00715    if (!s || !s->fmt) {
00716       return NULL;
00717    }
00718 
00719    if (!(fr = s->fmt->read(s, whennext))) {
00720       return NULL;
00721    }
00722 
00723    if (!(new_fr = ast_frisolate(fr))) {
00724       ast_frfree(fr);
00725       return NULL;
00726    }
00727 
00728    if (new_fr != fr) {
00729       ast_frfree(fr);
00730       fr = new_fr;
00731    }
00732 
00733    return fr;
00734 }
00735 
00736 struct ast_frame *ast_readframe(struct ast_filestream *s)
00737 {
00738    int whennext = 0;
00739 
00740    return read_frame(s, &whennext);
00741 }
00742 
00743 enum fsread_res {
00744    FSREAD_FAILURE,
00745    FSREAD_SUCCESS_SCHED,
00746    FSREAD_SUCCESS_NOSCHED,
00747 };
00748 
00749 static int ast_fsread_audio(const void *data);
00750 
00751 static enum fsread_res ast_readaudio_callback(struct ast_filestream *s)
00752 {
00753    int whennext = 0;
00754 
00755    while (!whennext) {
00756       struct ast_frame *fr;
00757 
00758       if (s->orig_chan_name && strcasecmp(s->owner->name, s->orig_chan_name)) {
00759          goto return_failure;
00760       }
00761 
00762       fr = read_frame(s, &whennext);
00763 
00764       if (!fr /* stream complete */ || ast_write(s->owner, fr) /* error writing */) {
00765          if (fr) {
00766             ast_log(LOG_WARNING, "Failed to write frame\n");
00767             ast_frfree(fr);
00768          }
00769          goto return_failure;
00770       } 
00771 
00772       if (fr) {
00773          ast_frfree(fr);
00774       }
00775    }
00776 
00777    if (whennext != s->lasttimeout) {
00778       if (s->owner->timingfd > -1) {
00779          float samp_rate = (float) ast_format_rate(s->fmt->format);
00780          unsigned int rate;
00781 
00782          rate = (unsigned int) roundf(samp_rate / ((float) whennext));
00783 
00784          ast_settimeout(s->owner, rate, ast_fsread_audio, s);
00785       } else {
00786          s->owner->streamid = ast_sched_add(s->owner->sched, 
00787             whennext / (ast_format_rate(s->fmt->format) / 1000), ast_fsread_audio, s);
00788       }
00789       s->lasttimeout = whennext;
00790       return FSREAD_SUCCESS_NOSCHED;
00791    }
00792    return FSREAD_SUCCESS_SCHED;
00793 
00794 return_failure:
00795    s->owner->streamid = -1;
00796    ast_settimeout(s->owner, 0, NULL, NULL);
00797    return FSREAD_FAILURE;
00798 }
00799 
00800 static int ast_fsread_audio(const void *data)
00801 {
00802    struct ast_filestream *fs = (struct ast_filestream *)data;
00803    enum fsread_res res;
00804 
00805    res = ast_readaudio_callback(fs);
00806 
00807    if (res == FSREAD_SUCCESS_SCHED)
00808       return 1;
00809    
00810    return 0;
00811 }
00812 
00813 static int ast_fsread_video(const void *data);
00814 
00815 static enum fsread_res ast_readvideo_callback(struct ast_filestream *s)
00816 {
00817    int whennext = 0;
00818 
00819    while (!whennext) {
00820       struct ast_frame *fr = read_frame(s, &whennext);
00821 
00822       if (!fr /* stream complete */ || ast_write(s->owner, fr) /* error writing */) {
00823          if (fr) {
00824             ast_log(LOG_WARNING, "Failed to write frame\n");
00825             ast_frfree(fr);
00826          }
00827          s->owner->vstreamid = -1;
00828          return FSREAD_FAILURE;
00829       }
00830 
00831       if (fr) {
00832          ast_frfree(fr);
00833       }
00834    }
00835 
00836    if (whennext != s->lasttimeout) {
00837       s->owner->vstreamid = ast_sched_add(s->owner->sched, 
00838          whennext / (ast_format_rate(s->fmt->format) / 1000), 
00839          ast_fsread_video, s);
00840       s->lasttimeout = whennext;
00841       return FSREAD_SUCCESS_NOSCHED;
00842    }
00843 
00844    return FSREAD_SUCCESS_SCHED;
00845 }
00846 
00847 static int ast_fsread_video(const void *data)
00848 {
00849    struct ast_filestream *fs = (struct ast_filestream *)data;
00850    enum fsread_res res;
00851 
00852    res = ast_readvideo_callback(fs);
00853 
00854    if (res == FSREAD_SUCCESS_SCHED)
00855       return 1;
00856    
00857    return 0;
00858 }
00859 
00860 int ast_applystream(struct ast_channel *chan, struct ast_filestream *s)
00861 {
00862    s->owner = chan;
00863    return 0;
00864 }
00865 
00866 int ast_playstream(struct ast_filestream *s)
00867 {
00868    enum fsread_res res;
00869 
00870    if (s->fmt->format & AST_FORMAT_AUDIO_MASK)
00871       res = ast_readaudio_callback(s);
00872    else
00873       res = ast_readvideo_callback(s);
00874 
00875    return (res == FSREAD_FAILURE) ? -1 : 0;
00876 }
00877 
00878 int ast_seekstream(struct ast_filestream *fs, off_t sample_offset, int whence)
00879 {
00880    return fs->fmt->seek(fs, sample_offset, whence);
00881 }
00882 
00883 int ast_truncstream(struct ast_filestream *fs)
00884 {
00885    return fs->fmt->trunc(fs);
00886 }
00887 
00888 off_t ast_tellstream(struct ast_filestream *fs)
00889 {
00890    return fs->fmt->tell(fs);
00891 }
00892 
00893 int ast_stream_fastforward(struct ast_filestream *fs, off_t ms)
00894 {
00895    return ast_seekstream(fs, ms * DEFAULT_SAMPLES_PER_MS, SEEK_CUR);
00896 }
00897 
00898 int ast_stream_rewind(struct ast_filestream *fs, off_t ms)
00899 {
00900    return ast_seekstream(fs, -ms * DEFAULT_SAMPLES_PER_MS, SEEK_CUR);
00901 }
00902 
00903 int ast_closestream(struct ast_filestream *f)
00904 {
00905    /* This used to destroy the filestream, but it now just decrements a refcount.
00906     * We close the stream in order to quit queuing frames now, because we might
00907     * change the writeformat, which could result in a subsequent write error, if
00908     * the format is different. */
00909    filestream_close(f);
00910    ao2_ref(f, -1);
00911    return 0;
00912 }
00913 
00914 
00915 /*
00916  * Look the various language-specific places where a file could exist.
00917  */
00918 int ast_fileexists(const char *filename, const char *fmt, const char *preflang)
00919 {
00920    char *buf;
00921    int buflen;
00922 
00923    if (preflang == NULL)
00924       preflang = "";
00925    buflen = strlen(preflang) + strlen(filename) + 4;  /* room for everything */
00926    buf = alloca(buflen);
00927    if (buf == NULL)
00928       return 0;
00929    return fileexists_core(filename, fmt, preflang, buf, buflen);
00930 }
00931 
00932 int ast_filedelete(const char *filename, const char *fmt)
00933 {
00934    return ast_filehelper(filename, NULL, fmt, ACTION_DELETE);
00935 }
00936 
00937 int ast_filerename(const char *filename, const char *filename2, const char *fmt)
00938 {
00939    return ast_filehelper(filename, filename2, fmt, ACTION_RENAME);
00940 }
00941 
00942 int ast_filecopy(const char *filename, const char *filename2, const char *fmt)
00943 {
00944    return ast_filehelper(filename, filename2, fmt, ACTION_COPY);
00945 }
00946 
00947 int ast_streamfile(struct ast_channel *chan, const char *filename, const char *preflang)
00948 {
00949    struct ast_filestream *fs;
00950    struct ast_filestream *vfs=NULL;
00951    char fmt[256];
00952    off_t pos;
00953    int seekattempt;
00954    int res;
00955 
00956    fs = ast_openstream(chan, filename, preflang);
00957    if (!fs) {
00958       ast_log(LOG_WARNING, "Unable to open %s (format %s): %s\n", filename, ast_getformatname_multiple(fmt, sizeof(fmt), chan->nativeformats), strerror(errno));
00959       return -1;
00960    }
00961 
00962    /* check to see if there is any data present (not a zero length file),
00963     * done this way because there is no where for ast_openstream_full to
00964     * return the file had no data. */
00965    pos = ftello(fs->f);
00966    seekattempt = fseeko(fs->f, -1, SEEK_END);
00967    if (seekattempt) {
00968       if (errno == EINVAL) {
00969          /* Zero-length file, as opposed to a pipe */
00970          return 0;
00971       } else {
00972          ast_seekstream(fs, 0, SEEK_SET);
00973       }
00974    } else {
00975       fseeko(fs->f, pos, SEEK_SET);
00976    }
00977 
00978    vfs = ast_openvstream(chan, filename, preflang);
00979    if (vfs) {
00980       ast_debug(1, "Ooh, found a video stream, too, format %s\n", ast_getformatname(vfs->fmt->format));
00981    }
00982 
00983    if (ast_test_flag(chan, AST_FLAG_MASQ_NOSTREAM))
00984       fs->orig_chan_name = ast_strdup(chan->name);
00985    if (ast_applystream(chan, fs))
00986       return -1;
00987    if (vfs && ast_applystream(chan, vfs))
00988       return -1;
00989    res = ast_playstream(fs);
00990    if (!res && vfs)
00991       res = ast_playstream(vfs);
00992    ast_verb(3, "<%s> Playing '%s.%s' (language '%s')\n", chan->name, filename, ast_getformatname(chan->writeformat), preflang ? preflang : "default");
00993 
00994    return res;
00995 }
00996 
00997 struct ast_filestream *ast_readfile(const char *filename, const char *type, const char *comment, int flags, int check, mode_t mode)
00998 {
00999    FILE *bfile;
01000    struct ast_format *f;
01001    struct ast_filestream *fs = NULL;
01002    char *fn;
01003    int format_found = 0;   
01004 
01005    AST_RWLIST_RDLOCK(&formats);
01006 
01007    AST_RWLIST_TRAVERSE(&formats, f, list) {
01008       fs = NULL;
01009       if (!exts_compare(f->exts, type))
01010          continue;
01011       else 
01012          format_found = 1;
01013 
01014       fn = build_filename(filename, type);
01015       errno = 0;
01016       bfile = fopen(fn, "r");
01017 
01018       if (!bfile || (fs = get_filestream(f, bfile)) == NULL || open_wrapper(fs) ) {
01019          ast_log(LOG_WARNING, "Unable to open %s\n", fn);
01020          if (fs) {
01021             ast_closestream(fs);
01022          }
01023          fs = NULL;
01024          bfile = NULL;
01025          ast_free(fn);
01026          break;            
01027       }
01028       /* found it */
01029       fs->trans = NULL;
01030       fs->fmt = f;
01031       fs->flags = flags;
01032       fs->mode = mode;
01033       fs->filename = ast_strdup(filename);
01034       fs->vfs = NULL;
01035       break;
01036    }
01037 
01038    AST_RWLIST_UNLOCK(&formats);
01039    if (!format_found)
01040       ast_log(LOG_WARNING, "No such format '%s'\n", type);
01041 
01042    return fs;
01043 }
01044 
01045 struct ast_filestream *ast_writefile(const char *filename, const char *type, const char *comment, int flags, int check, mode_t mode)
01046 {
01047    int fd, myflags = 0;
01048    /* compiler claims this variable can be used before initialization... */
01049    FILE *bfile = NULL;
01050    struct ast_format *f;
01051    struct ast_filestream *fs = NULL;
01052    char *buf = NULL;
01053    size_t size = 0;
01054    int format_found = 0;
01055 
01056    AST_RWLIST_RDLOCK(&formats);
01057 
01058    /* set the O_TRUNC flag if and only if there is no O_APPEND specified */
01059    /* We really can't use O_APPEND as it will break WAV header updates */
01060    if (flags & O_APPEND) { 
01061       flags &= ~O_APPEND;
01062    } else {
01063       myflags = O_TRUNC;
01064    }
01065    
01066    myflags |= O_WRONLY | O_CREAT;
01067 
01068    /* XXX need to fix this - we should just do the fopen,
01069     * not open followed by fdopen()
01070     */
01071    AST_RWLIST_TRAVERSE(&formats, f, list) {
01072       char *fn, *orig_fn = NULL;
01073       if (fs)
01074          break;
01075 
01076       if (!exts_compare(f->exts, type))
01077          continue;
01078       else
01079          format_found = 1;
01080 
01081       fn = build_filename(filename, type);
01082       fd = open(fn, flags | myflags, mode);
01083       if (fd > -1) {
01084          /* fdopen() the resulting file stream */
01085          bfile = fdopen(fd, ((flags | myflags) & O_RDWR) ? "w+" : "w");
01086          if (!bfile) {
01087             ast_log(LOG_WARNING, "Whoa, fdopen failed: %s!\n", strerror(errno));
01088             close(fd);
01089             fd = -1;
01090          }
01091       }
01092       
01093       if (ast_opt_cache_record_files && (fd > -1)) {
01094          char *c;
01095 
01096          fclose(bfile); /* this also closes fd */
01097          /*
01098            We touch orig_fn just as a place-holder so other things (like vmail) see the file is there.
01099            What we are really doing is writing to record_cache_dir until we are done then we will mv the file into place.
01100          */
01101          orig_fn = ast_strdupa(fn);
01102          for (c = fn; *c; c++)
01103             if (*c == '/')
01104                *c = '_';
01105 
01106          size = strlen(fn) + strlen(record_cache_dir) + 2;
01107          buf = alloca(size);
01108          strcpy(buf, record_cache_dir);
01109          strcat(buf, "/");
01110          strcat(buf, fn);
01111          ast_free(fn);
01112          fn = buf;
01113          fd = open(fn, flags | myflags, mode);
01114          if (fd > -1) {
01115             /* fdopen() the resulting file stream */
01116             bfile = fdopen(fd, ((flags | myflags) & O_RDWR) ? "w+" : "w");
01117             if (!bfile) {
01118                ast_log(LOG_WARNING, "Whoa, fdopen failed: %s!\n", strerror(errno));
01119                close(fd);
01120                fd = -1;
01121             }
01122          }
01123       }
01124       if (fd > -1) {
01125          errno = 0;
01126          fs = get_filestream(f, bfile);
01127          if (fs) {
01128             if ((fs->write_buffer = ast_malloc(32768))) {
01129                setvbuf(fs->f, fs->write_buffer, _IOFBF, 32768);
01130             }
01131          }
01132          if (!fs || rewrite_wrapper(fs, comment)) {
01133             ast_log(LOG_WARNING, "Unable to rewrite %s\n", fn);
01134             close(fd);
01135             if (orig_fn) {
01136                unlink(fn);
01137                unlink(orig_fn);
01138             }
01139             if (fs) {
01140                ast_closestream(fs);
01141                fs = NULL;
01142             }
01143             continue;
01144          }
01145          fs->trans = NULL;
01146          fs->fmt = f;
01147          fs->flags = flags;
01148          fs->mode = mode;
01149          if (orig_fn) {
01150             fs->realfilename = ast_strdup(orig_fn);
01151             fs->filename = ast_strdup(fn);
01152          } else {
01153             fs->realfilename = NULL;
01154             fs->filename = ast_strdup(filename);
01155          }
01156          fs->vfs = NULL;
01157          /* If truncated, we'll be at the beginning; if not truncated, then append */
01158          f->seek(fs, 0, SEEK_END);
01159       } else if (errno != EEXIST) {
01160          ast_log(LOG_WARNING, "Unable to open file %s: %s\n", fn, strerror(errno));
01161          if (orig_fn)
01162             unlink(orig_fn);
01163       }
01164       /* if buf != NULL then fn is already free and pointing to it */
01165       if (!buf)
01166          ast_free(fn);
01167    }
01168 
01169    AST_RWLIST_UNLOCK(&formats);
01170 
01171    if (!format_found)
01172       ast_log(LOG_WARNING, "No such format '%s'\n", type);
01173 
01174    return fs;
01175 }
01176 
01177 /*!
01178  * \brief the core of all waitstream() functions
01179  */
01180 static int waitstream_core(struct ast_channel *c, const char *breakon,
01181    const char *forward, const char *reverse, int skip_ms,
01182    int audiofd, int cmdfd,  const char *context)
01183 {
01184    const char *orig_chan_name = NULL;
01185    int err = 0;
01186 
01187    if (!breakon)
01188       breakon = "";
01189    if (!forward)
01190       forward = "";
01191    if (!reverse)
01192       reverse = "";
01193 
01194    /* Switch the channel to end DTMF frame only. waitstream_core doesn't care about the start of DTMF. */
01195    ast_set_flag(c, AST_FLAG_END_DTMF_ONLY);
01196 
01197    if (ast_test_flag(c, AST_FLAG_MASQ_NOSTREAM))
01198       orig_chan_name = ast_strdupa(c->name);
01199 
01200    while (c->stream) {
01201       int res;
01202       int ms;
01203 
01204       if (orig_chan_name && strcasecmp(orig_chan_name, c->name)) {
01205          ast_stopstream(c);
01206          err = 1;
01207          break;
01208       }
01209 
01210       ms = ast_sched_wait(c->sched);
01211 
01212       if (ms < 0 && !c->timingfunc) {
01213          ast_stopstream(c);
01214          break;
01215       }
01216       if (ms < 0)
01217          ms = 1000;
01218       if (cmdfd < 0) {
01219          res = ast_waitfor(c, ms);
01220          if (res < 0) {
01221             ast_log(LOG_WARNING, "Select failed (%s)\n", strerror(errno));
01222             ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01223             return res;
01224          }
01225       } else {
01226          int outfd;
01227          struct ast_channel *rchan = ast_waitfor_nandfds(&c, 1, &cmdfd, (cmdfd > -1) ? 1 : 0, NULL, &outfd, &ms);
01228          if (!rchan && (outfd < 0) && (ms)) {
01229             /* Continue */
01230             if (errno == EINTR)
01231                continue;
01232             ast_log(LOG_WARNING, "Wait failed (%s)\n", strerror(errno));
01233             ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01234             return -1;
01235          } else if (outfd > -1) { /* this requires cmdfd set */
01236             /* The FD we were watching has something waiting */
01237             ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01238             return 1;
01239          }
01240          /* if rchan is set, it is 'c' */
01241          res = rchan ? 1 : 0; /* map into 'res' values */
01242       }
01243       if (res > 0) {
01244          struct ast_frame *fr = ast_read(c);
01245          if (!fr) {
01246             ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01247             return -1;
01248          }
01249          switch (fr->frametype) {
01250          case AST_FRAME_DTMF_END:
01251             if (context) {
01252                const char exten[2] = { fr->subclass.integer, '\0' };
01253                if (ast_exists_extension(c, context, exten, 1,
01254                   S_COR(c->caller.id.number.valid, c->caller.id.number.str, NULL))) {
01255                   res = fr->subclass.integer;
01256                   ast_frfree(fr);
01257                   ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01258                   return res;
01259                }
01260             } else {
01261                res = fr->subclass.integer;
01262                if (strchr(forward, res)) {
01263                   int eoftest;
01264                   ast_stream_fastforward(c->stream, skip_ms);
01265                   eoftest = fgetc(c->stream->f);
01266                   if (feof(c->stream->f)) {
01267                      ast_stream_rewind(c->stream, skip_ms);
01268                   } else {
01269                      ungetc(eoftest, c->stream->f);
01270                   }
01271                } else if (strchr(reverse, res)) {
01272                   ast_stream_rewind(c->stream, skip_ms);
01273                } else if (strchr(breakon, res)) {
01274                   ast_frfree(fr);
01275                   ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01276                   return res;
01277                }              
01278             }
01279             break;
01280          case AST_FRAME_CONTROL:
01281             switch (fr->subclass.integer) {
01282             case AST_CONTROL_HANGUP:
01283             case AST_CONTROL_BUSY:
01284             case AST_CONTROL_CONGESTION:
01285                ast_frfree(fr);
01286                ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01287                return -1;
01288             case AST_CONTROL_RINGING:
01289             case AST_CONTROL_ANSWER:
01290             case AST_CONTROL_VIDUPDATE:
01291             case AST_CONTROL_SRCUPDATE:
01292             case AST_CONTROL_SRCCHANGE:
01293             case AST_CONTROL_HOLD:
01294             case AST_CONTROL_UNHOLD:
01295             case AST_CONTROL_CONNECTED_LINE:
01296             case AST_CONTROL_REDIRECTING:
01297             case AST_CONTROL_AOC:
01298             case AST_CONTROL_UPDATE_RTP_PEER:
01299             case -1:
01300                /* Unimportant */
01301                break;
01302             default:
01303                ast_log(LOG_WARNING, "Unexpected control subclass '%d'\n", fr->subclass.integer);
01304             }
01305             break;
01306          case AST_FRAME_VOICE:
01307             /* Write audio if appropriate */
01308             if (audiofd > -1) {
01309                if (write(audiofd, fr->data.ptr, fr->datalen) < 0) {
01310                   ast_log(LOG_WARNING, "write() failed: %s\n", strerror(errno));
01311                }
01312             }
01313          default:
01314             /* Ignore all others */
01315             break;
01316          }
01317          ast_frfree(fr);
01318       }
01319       ast_sched_runq(c->sched);
01320    }
01321 
01322    ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01323 
01324    return (err || c->_softhangup) ? -1 : 0;
01325 }
01326 
01327 int ast_waitstream_fr(struct ast_channel *c, const char *breakon, const char *forward, const char *reverse, int ms)
01328 {
01329    return waitstream_core(c, breakon, forward, reverse, ms,
01330       -1 /* no audiofd */, -1 /* no cmdfd */, NULL /* no context */);
01331 }
01332 
01333 int ast_waitstream(struct ast_channel *c, const char *breakon)
01334 {
01335    return waitstream_core(c, breakon, NULL, NULL, 0, -1, -1, NULL);
01336 }
01337 
01338 int ast_waitstream_full(struct ast_channel *c, const char *breakon, int audiofd, int cmdfd)
01339 {
01340    return waitstream_core(c, breakon, NULL, NULL, 0,
01341       audiofd, cmdfd, NULL /* no context */);
01342 }
01343 
01344 int ast_waitstream_exten(struct ast_channel *c, const char *context)
01345 {
01346    /* Waitstream, with return in the case of a valid 1 digit extension */
01347    /* in the current or specified context being pressed */
01348 
01349    if (!context)
01350       context = c->context;
01351    return waitstream_core(c, NULL, NULL, NULL, 0,
01352       -1, -1, context);
01353 }
01354 
01355 /*
01356  * if the file name is non-empty, try to play it.
01357  * Return 0 if success, -1 if error, digit if interrupted by a digit.
01358  * If digits == "" then we can simply check for non-zero.
01359  */
01360 int ast_stream_and_wait(struct ast_channel *chan, const char *file, const char *digits)
01361 {
01362    int res = 0;
01363    if (!ast_strlen_zero(file)) {
01364       ast_test_suite_event_notify("PLAYBACK", "Message: %s", file);
01365       res = ast_streamfile(chan, file, chan->language);
01366       if (!res) {
01367          res = ast_waitstream(chan, digits);
01368       }
01369    }
01370    return res;
01371 } 
01372 
01373 char *ast_format_str_reduce(char *fmts)
01374 {
01375    struct ast_format *f;
01376    struct ast_format *fmts_ptr[AST_MAX_FORMATS];
01377    char *fmts_str[AST_MAX_FORMATS];
01378    char *stringp, *type;
01379    char *orig = fmts;
01380    int i, j, x, first, found = 0;
01381    int len = strlen(fmts) + 1;
01382    int res;
01383 
01384    if (AST_RWLIST_RDLOCK(&formats)) {
01385       ast_log(LOG_WARNING, "Unable to lock format list\n");
01386       return NULL;
01387    }
01388 
01389    stringp = ast_strdupa(fmts);
01390 
01391    for (x = 0; (type = strsep(&stringp, "|")) && x < AST_MAX_FORMATS; x++) {
01392       AST_RWLIST_TRAVERSE(&formats, f, list) {
01393          if (exts_compare(f->exts, type)) {
01394             found = 1;
01395             break;
01396          }
01397       }
01398 
01399       fmts_str[x] = type;
01400       if (found) {
01401          fmts_ptr[x] = f;
01402       } else {
01403          fmts_ptr[x] = NULL;
01404       }
01405    }
01406    AST_RWLIST_UNLOCK(&formats);
01407 
01408    first = 1;
01409    for (i = 0; i < x; i++) {
01410       /* ignore invalid entries */
01411       if (!fmts_ptr[i]) {
01412          ast_log(LOG_WARNING, "ignoring unknown format '%s'\n", fmts_str[i]);
01413          continue;
01414       }
01415 
01416       /* special handling for the first entry */
01417       if (first) {
01418          res = snprintf(fmts, len, "%s", fmts_str[i]);
01419          fmts += res;
01420          len -= res;
01421          first = 0;
01422          continue;
01423       }
01424 
01425       found = 0;
01426       for (j = 0; j < i; j++) {
01427          /* this is a duplicate */
01428          if (fmts_ptr[j] == fmts_ptr[i]) {
01429             found = 1;
01430             break;
01431          }
01432       }
01433 
01434       if (!found) {
01435          res = snprintf(fmts, len, "|%s", fmts_str[i]);
01436          fmts += res;
01437          len -= res;
01438       }
01439    }
01440 
01441    if (first) {
01442       ast_log(LOG_WARNING, "no known formats found in format list (%s)\n", orig);
01443       return NULL;
01444    }
01445 
01446    return orig;
01447 }
01448 
01449 static char *handle_cli_core_show_file_formats(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
01450 {
01451 #define FORMAT "%-10s %-10s %-20s\n"
01452 #define FORMAT2 "%-10s %-10s %-20s\n"
01453    struct ast_format *f;
01454    int count_fmt = 0;
01455 
01456    switch (cmd) {
01457    case CLI_INIT:
01458       e->command = "core show file formats";
01459       e->usage =
01460          "Usage: core show file formats\n"
01461          "       Displays currently registered file formats (if any).\n";
01462       return NULL;
01463    case CLI_GENERATE:
01464       return NULL;
01465    }
01466 
01467    if (a->argc != 4)
01468       return CLI_SHOWUSAGE;
01469 
01470    ast_cli(a->fd, FORMAT, "Format", "Name", "Extensions");
01471    ast_cli(a->fd, FORMAT, "------", "----", "----------");
01472 
01473    AST_RWLIST_RDLOCK(&formats);
01474    AST_RWLIST_TRAVERSE(&formats, f, list) {
01475       ast_cli(a->fd, FORMAT2, ast_getformatname(f->format), f->name, f->exts);
01476       count_fmt++;
01477    }
01478    AST_RWLIST_UNLOCK(&formats);
01479    ast_cli(a->fd, "%d file formats registered.\n", count_fmt);
01480    return CLI_SUCCESS;
01481 #undef FORMAT
01482 #undef FORMAT2
01483 }
01484 
01485 static struct ast_cli_entry cli_file[] = {
01486    AST_CLI_DEFINE(handle_cli_core_show_file_formats, "Displays file formats")
01487 };
01488 
01489 int ast_file_init(void)
01490 {
01491    ast_cli_register_multiple(cli_file, ARRAY_LEN(cli_file));
01492    return 0;
01493 }

Generated on Mon Mar 19 11:30:27 2012 for Asterisk - The Open Source Telephony Project by  doxygen 1.4.7