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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 1999 - 2006, Digium, Inc.
*
* Mark Spencer <[email protected]>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*! \file
*
* \brief Generic File Format Support.
*
* \author Mark Spencer <[email protected]>
*/
/*** MODULEINFO
<support_level>core</support_level>
***/
#include "asterisk.h"
#include <dirent.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <math.h>
#include "asterisk/_private.h" /* declare ast_file_init() */
#include "asterisk/paths.h" /* use ast_config_AST_DATA_DIR */
#include "asterisk/mod_format.h"
#include "asterisk/cli.h"
#include "asterisk/channel.h"
#include "asterisk/sched.h"
#include "asterisk/translate.h"
#include "asterisk/utils.h"
#include "asterisk/lock.h"
#include "asterisk/app.h"
#include "asterisk/pbx.h"
#include "asterisk/linkedlists.h"
#include "asterisk/module.h"
#include "asterisk/astobj2.h"
#include "asterisk/test.h"
#include "asterisk/stasis.h"
#include "asterisk/json.h"
#include "asterisk/stasis_system.h"
#include "asterisk/media_cache.h"
/*! \brief
* The following variable controls the layout of localized sound files.
* If 0, use the historical layout with prefix just before the filename
* (i.e. digits/en/1.gsm , digits/it/1.gsm or default to digits/1.gsm),
* if 1 put the prefix at the beginning of the filename
* (i.e. en/digits/1.gsm, it/digits/1.gsm or default to digits/1.gsm).
* The latter permits a language to be entirely in one directory.
*
* This is settable in asterisk.conf.
*/
int ast_language_is_prefix = 1;
static AST_RWLIST_HEAD_STATIC(formats, ast_format_def);
STASIS_MESSAGE_TYPE_DEFN(ast_format_register_type);
STASIS_MESSAGE_TYPE_DEFN(ast_format_unregister_type);
static struct ast_json *json_array_from_list(const char *list, const char *sep)
{
RAII_VAR(struct ast_json *, array, ast_json_array_create(), ast_json_unref);
char *stringp, *ext;
stringp = ast_strdupa(list); /* this is in the stack so does not need to be freed */
if (!array || !stringp) {
return NULL;
}
while ((ext = strsep(&stringp, sep))) {
if (ast_json_array_append(array, ast_json_string_create(ext))) {
return NULL;
}
}
return ast_json_ref(array);
}
static int publish_format_update(const struct ast_format_def *f, struct stasis_message_type *type)
{
RAII_VAR(struct stasis_message *, msg, NULL, ao2_cleanup);
RAII_VAR(struct ast_json_payload *, json_payload, NULL, ao2_cleanup);
RAII_VAR(struct ast_json *, json_object, NULL, ast_json_unref);
if (!type) {
return -1;
}
json_object = ast_json_pack("{s: s, s: o}",
"format", f->name,
"extensions", json_array_from_list(f->exts, "|"));
if (!json_object) {
return -1;
}
json_payload = ast_json_payload_create(json_object);
if (!json_payload) {
return -1;
}
msg = stasis_message_create(type, json_payload);
if (!msg) {
return -1;
}
stasis_publish(ast_system_topic(), msg);
return 0;
}
int __ast_format_def_register(const struct ast_format_def *f, struct ast_module *mod)
{
struct ast_format_def *tmp;
AST_RWLIST_WRLOCK(&formats);
AST_RWLIST_TRAVERSE(&formats, tmp, list) {
if (!strcasecmp(f->name, tmp->name)) {
AST_RWLIST_UNLOCK(&formats);
ast_log(LOG_WARNING, "Tried to register '%s' format, already registered\n", f->name);
return -1;
}
}
if (!(tmp = ast_calloc(1, sizeof(*tmp)))) {
AST_RWLIST_UNLOCK(&formats);
return -1;
}
*tmp = *f;
tmp->module = mod;
if (tmp->buf_size) {
/*
* Align buf_size properly, rounding up to the machine-specific
* alignment for pointers.
*/
struct _test_align { void *a, *b; } p;
int align = (char *)&p.b - (char *)&p.a;
tmp->buf_size = ((f->buf_size + align - 1) / align) * align;
}
memset(&tmp->list, 0, sizeof(tmp->list));
AST_RWLIST_INSERT_HEAD(&formats, tmp, list);
AST_RWLIST_UNLOCK(&formats);
ast_verb(2, "Registered file format %s, extension(s) %s\n", f->name, f->exts);
publish_format_update(f, ast_format_register_type());
return 0;
}
int ast_format_def_unregister(const char *name)
{
struct ast_format_def *tmp;
int res = -1;
AST_RWLIST_WRLOCK(&formats);
AST_RWLIST_TRAVERSE_SAFE_BEGIN(&formats, tmp, list) {
if (!strcasecmp(name, tmp->name)) {
AST_RWLIST_REMOVE_CURRENT(list);
publish_format_update(tmp, ast_format_unregister_type());
ast_free(tmp);
res = 0;
}
}
AST_RWLIST_TRAVERSE_SAFE_END;
AST_RWLIST_UNLOCK(&formats);
if (!res)
ast_verb(2, "Unregistered format %s\n", name);
else
ast_log(LOG_WARNING, "Tried to unregister format %s, already unregistered\n", name);
return res;
}
FILE *ast_file_mkftemp(char *template, mode_t mode)
{
FILE *p = NULL;
int pfd = mkstemp(template);
chmod(template, mode);
if (pfd > -1) {
p = fdopen(pfd, "w+");
if (!p) {
close(pfd);
pfd = -1;
}
}
return p;
}
int ast_file_fdtemp(const char *path, char **filename, const char *template_name)
{
int fd;
if (ast_asprintf(filename, "%s/%s", path, template_name) < 0) {
ast_log(LOG_ERROR, "Failed to set up temporary file path\n");
return -1;
}
ast_mkdir(path, 0644);
if ((fd = mkstemp(*filename)) < 0) {
ast_log(LOG_NOTICE, "Failed to create temporary file\n");
ast_free(*filename);
return -1;
}
return fd;
}
int ast_stopstream(struct ast_channel *tmp)
{
ast_channel_lock(tmp);
/* Stop a running stream if there is one */
if (ast_channel_stream(tmp)) {
ast_closestream(ast_channel_stream(tmp));
ast_channel_stream_set(tmp, NULL);
if (ast_channel_oldwriteformat(tmp) && ast_set_write_format(tmp, ast_channel_oldwriteformat(tmp)))
ast_log(LOG_WARNING, "Unable to restore format back to %s\n", ast_format_get_name(ast_channel_oldwriteformat(tmp)));
}
/* Stop the video stream too */
if (ast_channel_vstream(tmp) != NULL) {
ast_closestream(ast_channel_vstream(tmp));
ast_channel_vstream_set(tmp, NULL);
}
ast_channel_unlock(tmp);
return 0;
}
int ast_writestream(struct ast_filestream *fs, struct ast_frame *f)
{
int res = -1;
if (f->frametype == AST_FRAME_VIDEO) {
if (ast_format_get_type(fs->fmt->format) == AST_MEDIA_TYPE_AUDIO) {
/* This is the audio portion. Call the video one... */
if (!fs->vfs && fs->filename) {
const char *type = ast_format_get_name(f->subclass.format);
fs->vfs = ast_writefile(fs->filename, type, NULL, fs->flags, 0, fs->mode);
ast_debug(1, "Opened video output file\n");
}
if (fs->vfs)
return ast_writestream(fs->vfs, f);
/* else ignore */
return 0;
}
} else if (f->frametype != AST_FRAME_VOICE) {
ast_log(LOG_WARNING, "Tried to write non-voice frame\n");
return -1;
}
if (ast_format_cmp(f->subclass.format, fs->fmt->format) != AST_FORMAT_CMP_NOT_EQUAL) {
res = fs->fmt->write(fs, f);
if (res < 0)
ast_log(LOG_WARNING, "Natural write failed\n");
else if (res > 0)
ast_log(LOG_WARNING, "Huh??\n");
} else {
/* XXX If they try to send us a type of frame that isn't the normal frame, and isn't
the one we've setup a translator for, we do the "wrong thing" XXX */
if (fs->trans && (ast_format_cmp(f->subclass.format, fs->lastwriteformat) != AST_FORMAT_CMP_EQUAL)) {
ast_translator_free_path(fs->trans);
fs->trans = NULL;
}
if (!fs->trans) {
fs->trans = ast_translator_build_path(fs->fmt->format, f->subclass.format);
}
if (!fs->trans) {
ast_log(LOG_WARNING, "Unable to translate to format %s, source format %s\n",
fs->fmt->name, ast_format_get_name(f->subclass.format));
} else {
struct ast_frame *trf;
ao2_replace(fs->lastwriteformat, f->subclass.format);
/* Get the translated frame but don't consume the original in case they're using it on another stream */
if ((trf = ast_translate(fs->trans, f, 0))) {
struct ast_frame *cur;
/* the translator may have returned multiple frames, so process them */
for (cur = trf; cur; cur = AST_LIST_NEXT(cur, frame_list)) {
if ((res = fs->fmt->write(fs, trf))) {
ast_log(LOG_WARNING, "Translated frame write failed\n");
break;
}
}
ast_frfree(trf);
} else {
res = 0;
}
}
}
return res;
}
static int copy(const char *infile, const char *outfile)
{
int ifd, ofd, len;
char buf[4096]; /* XXX make it larger. */
if ((ifd = open(infile, O_RDONLY)) < 0) {
ast_log(LOG_WARNING, "Unable to open %s in read-only mode\n", infile);
return -1;
}
if ((ofd = open(outfile, O_WRONLY | O_TRUNC | O_CREAT, AST_FILE_MODE)) < 0) {
ast_log(LOG_WARNING, "Unable to open %s in write-only mode\n", outfile);
close(ifd);
return -1;
}
while ( (len = read(ifd, buf, sizeof(buf)) ) ) {
int res;
if (len < 0) {
ast_log(LOG_WARNING, "Read failed on %s: %s\n", infile, strerror(errno));
break;
}
/* XXX handle partial writes */
res = write(ofd, buf, len);
if (res != len) {
ast_log(LOG_WARNING, "Write failed on %s (%d of %d): %s\n", outfile, res, len, strerror(errno));
len = -1; /* error marker */
break;
}
}
close(ifd);
close(ofd);
if (len < 0) {
unlink(outfile);
return -1; /* error */
}
return 0; /* success */
}
/*!
* \brief construct a filename. Absolute pathnames are preserved,
* relative names are prefixed by the sounds/ directory.
* The wav49 suffix is replaced by 'WAV'.
* Returns a malloc'ed string to be freed by the caller.
*/
static char *build_filename(const char *filename, const char *ext)
{
char *fn = NULL;
/* The wav49 -> WAV translation is duplicated in apps/app_mixmonitor.c, so
if you change it here you need to change it there as well */
if (!strcmp(ext, "wav49"))
ext = "WAV";
if (filename[0] == '/') {
if (ast_asprintf(&fn, "%s.%s", filename, ext) < 0) {
fn = NULL;
}
} else {
if (ast_asprintf(&fn, "%s/sounds/%s.%s",
ast_config_AST_DATA_DIR, filename, ext) < 0) {
fn = NULL;
}
}
return fn;
}
/* compare type against the list 'exts' */
/* XXX need a better algorithm */
static int type_in_list(const char *list, const char *type, int (*cmp)(const char *s1, const char *s2))
{
char *stringp = ast_strdupa(list), *item;
while ((item = strsep(&stringp, "|"))) {
if (!cmp(item, type)) {
return 1;
}
}
return 0;
}
#define exts_compare(list, type) (type_in_list((list), (type), strcmp))
/*!
* \internal
* \brief Close the file stream by canceling any pending read / write callbacks
*/
static void filestream_close(struct ast_filestream *f)
{
enum ast_media_type format_type = ast_format_get_type(f->fmt->format);
if (!f->owner) {
return;
}
/* Stop a running stream if there is one */
switch (format_type)
{
case AST_MEDIA_TYPE_AUDIO:
ast_channel_stream_set(f->owner, NULL);
AST_SCHED_DEL_ACCESSOR(ast_channel_sched(f->owner), f->owner, ast_channel_streamid, ast_channel_streamid_set);
ast_settimeout(f->owner, 0, NULL, NULL);
break;
case AST_MEDIA_TYPE_VIDEO:
ast_channel_vstream_set(f->owner, NULL);
AST_SCHED_DEL_ACCESSOR(ast_channel_sched(f->owner), f->owner, ast_channel_vstreamid, ast_channel_vstreamid_set);
break;
default:
ast_log(AST_LOG_WARNING, "Unable to schedule deletion of filestream with unsupported type %s\n", f->fmt->name);
break;
}
}
static void filestream_destructor(void *arg)
{
struct ast_filestream *f = arg;
int status;
int pid = -1;
/* Stop a running stream if there is one */
filestream_close(f);
/* destroy the translator on exit */
if (f->trans)
ast_translator_free_path(f->trans);
if (f->fmt->close) {
void (*closefn)(struct ast_filestream *) = f->fmt->close;
closefn(f);
}
if (f->f) {
fclose(f->f);
}
if (f->realfilename && f->filename) {
pid = ast_safe_fork(0);
if (!pid) {
execl("/bin/mv", "mv", "-f", f->filename, f->realfilename, SENTINEL);
_exit(1);
}
else if (pid > 0) {
/* Block the parent until the move is complete.*/
waitpid(pid, &status, 0);
}
}
ast_free(f->filename);
ast_free(f->realfilename);
if (f->vfs)
ast_closestream(f->vfs);
ast_free(f->write_buffer);
ast_free((void *)f->orig_chan_name);
ao2_cleanup(f->lastwriteformat);
ao2_cleanup(f->fr.subclass.format);
ast_module_unref(f->fmt->module);
}
static struct ast_filestream *get_filestream(struct ast_format_def *fmt, FILE *bfile)
{
struct ast_filestream *s;
int l = sizeof(*s) + fmt->buf_size + fmt->desc_size; /* total allocation size */
if (!ast_module_running_ref(fmt->module)) {
return NULL;
}
s = ao2_alloc(l, filestream_destructor);
if (!s) {
ast_module_unref(fmt->module);
return NULL;
}
s->fmt = fmt;
s->f = bfile;
if (fmt->desc_size)
s->_private = ((char *)(s + 1)) + fmt->buf_size;
if (fmt->buf_size)
s->buf = (char *)(s + 1);
s->fr.src = fmt->name;
if (ast_format_get_type(fmt->format) == AST_MEDIA_TYPE_AUDIO) {
s->fr.frametype = AST_FRAME_VOICE;
} else if (ast_format_get_type(fmt->format) == AST_MEDIA_TYPE_VIDEO) {
s->fr.frametype = AST_FRAME_VIDEO;
}
s->fr.mallocd = 0;
s->fr.subclass.format = ao2_bump(fmt->format);
return s;
}
/*
* Default implementations of open and rewrite.
* Only use them if you don't have expensive stuff to do.
*/
enum wrap_fn { WRAP_OPEN, WRAP_REWRITE };
static int fn_wrapper(struct ast_filestream *s, const char *comment, enum wrap_fn mode)
{
struct ast_format_def *f = s->fmt;
int ret = -1;
int (*openfn)(struct ast_filestream *s);
if (mode == WRAP_OPEN && (openfn = f->open) && openfn(s))
ast_log(LOG_WARNING, "Unable to open format %s\n", f->name);
else if (mode == WRAP_REWRITE && f->rewrite && f->rewrite(s, comment))
ast_log(LOG_WARNING, "Unable to rewrite format %s\n", f->name);
else {
/* preliminary checks succeed. */
ret = 0;
}
return ret;
}
static int rewrite_wrapper(struct ast_filestream *s, const char *comment)
{
return fn_wrapper(s, comment, WRAP_REWRITE);
}
static int open_wrapper(struct ast_filestream *s)
{
return fn_wrapper(s, NULL, WRAP_OPEN);
}
enum file_action {
ACTION_EXISTS = 1, /* return matching format if file exists, 0 otherwise */
ACTION_DELETE, /* delete file, return 0 on success, -1 on error */
ACTION_RENAME, /* rename file. return 0 on success, -1 on error */
ACTION_OPEN,
ACTION_COPY /* copy file. return 0 on success, -1 on error */
};
/*!
* \internal
* \brief perform various actions on a file. Second argument
* \note arg2 depends on the command:
* unused for DELETE
* optional ast_format_cap holding all the formats found for a file, for EXISTS.
* destination file name (const char *) for COPY and RENAME
* struct ast_channel * for OPEN
* if fmt is NULL, OPEN will return the first matching entry,
* whereas other functions will run on all matching entries.
*/
static int filehelper(const char *filename, const void *arg2, const char *fmt, const enum file_action action)
{
struct ast_format_def *f;
int res = (action == ACTION_EXISTS) ? 0 : -1;
AST_RWLIST_RDLOCK(&formats);
/* Check for a specific format */
AST_RWLIST_TRAVERSE(&formats, f, list) {
char *ext = NULL;
char storage[strlen(f->exts) + 1];
char *stringp;
if (fmt && !exts_compare(f->exts, fmt))
continue;
/* Look for a file matching the supported extensions.
* The file must exist, and for OPEN, must match
* one of the formats supported by the channel.
*/
strcpy(storage, f->exts); /* safe - this is in the stack so does not need to be freed */
stringp = storage;
while ( (ext = strsep(&stringp, "|")) ) {
struct stat st;
char *fn = build_filename(filename, ext);
if (fn == NULL)
continue;
if ( stat(fn, &st) ) { /* file not existent */
ast_free(fn);
continue;
}
/* for 'OPEN' we need to be sure that the format matches
* what the channel can process
*/
if (action == ACTION_OPEN) {
struct ast_channel *chan = (struct ast_channel *)arg2;
FILE *bfile;
struct ast_filestream *s;
if ((ast_format_cmp(ast_channel_writeformat(chan), f->format) == AST_FORMAT_CMP_NOT_EQUAL) &&
!(((ast_format_get_type(f->format) == AST_MEDIA_TYPE_AUDIO) && fmt) ||
((ast_format_get_type(f->format) == AST_MEDIA_TYPE_VIDEO) && fmt))) {
ast_free(fn);
continue; /* not a supported format */
}
if ( (bfile = fopen(fn, "r")) == NULL) {
ast_free(fn);
continue; /* cannot open file */
}
s = get_filestream(f, bfile);
if (!s) {
fclose(bfile);
ast_free(fn); /* cannot allocate descriptor */
continue;
}
if (open_wrapper(s)) {
ast_free(fn);
ast_closestream(s);
continue; /* cannot run open on file */
}
if (st.st_size == 0) {
ast_log(LOG_WARNING, "File %s detected to have zero size.\n", fn);
}
/* ok this is good for OPEN */
res = 1; /* found */
s->lasttimeout = -1;
s->fmt = f;
s->trans = NULL;
s->filename = NULL;
if (ast_format_get_type(s->fmt->format) == AST_MEDIA_TYPE_AUDIO) {
if (ast_channel_stream(chan))
ast_closestream(ast_channel_stream(chan));
ast_channel_stream_set(chan, s);
} else {
if (ast_channel_vstream(chan))
ast_closestream(ast_channel_vstream(chan));
ast_channel_vstream_set(chan, s);
}
ast_free(fn);
break;
}
switch (action) {
case ACTION_OPEN:
break; /* will never get here */
case ACTION_EXISTS: /* return the matching format */
/* if arg2 is present, it is a format capabilities structure.
* Add this format to the set of formats this file can be played in */
if (arg2) {
ast_format_cap_append((struct ast_format_cap *) arg2, f->format, 0);
}
res = 1; /* file does exist and format it exists in is returned in arg2 */
break;
case ACTION_DELETE:
if ( (res = unlink(fn)) )
ast_log(LOG_WARNING, "unlink(%s) failed: %s\n", fn, strerror(errno));
break;
case ACTION_RENAME:
case ACTION_COPY: {
char *nfn = build_filename((const char *)arg2, ext);
if (!nfn)
ast_log(LOG_WARNING, "Out of memory\n");
else {
res = action == ACTION_COPY ? copy(fn, nfn) : rename(fn, nfn);
if (res)
ast_log(LOG_WARNING, "%s(%s,%s) failed: %s\n",
action == ACTION_COPY ? "copy" : "rename",
fn, nfn, strerror(errno));
ast_free(nfn);
}
}
break;
default:
ast_log(LOG_WARNING, "Unknown helper %u\n", action);
}
ast_free(fn);
}
}
AST_RWLIST_UNLOCK(&formats);
return res;
}
static int is_absolute_path(const char *filename)
{
return filename[0] == '/';
}
static int is_remote_path(const char *filename)
{
return strstr(filename, "://") ? 1 : 0;
}
/*!
* \brief test if a file exists for a given format.
* \note result_cap is OPTIONAL
* \retval 1 true and result_cap represents format capabilities file exists in.
* \retval 0 false
*/
static int fileexists_test(const char *filename, const char *fmt, const char *lang,
char *buf, int buflen, struct ast_format_cap *result_cap)
{
if (buf == NULL) {
return 0;
}
if (is_remote_path(filename) && !ast_media_cache_retrieve(filename, NULL, buf, buflen)) {
return filehelper(buf, result_cap, NULL, ACTION_EXISTS);
}
if (ast_language_is_prefix && !is_absolute_path(filename)) { /* new layout */
if (lang) {
snprintf(buf, buflen, "%s/%s", lang, filename);
} else {
snprintf(buf, buflen, "%s", filename);
}
} else { /* old layout */
strcpy(buf, filename); /* first copy the full string */
if (lang) {
/* insert the language and suffix if needed */
const char *c = strrchr(filename, '/');
int offset = c ? c - filename + 1 : 0; /* points right after the last '/' */
snprintf(buf + offset, buflen - offset, "%s/%s", lang, filename + offset);
}
}
return filehelper(buf, result_cap, fmt, ACTION_EXISTS);
}
/*!
* \brief helper routine to locate a file with a given format
* and language preference.
*
* \note Try preflang, preflang with stripped '_' suffices, or NULL.
*
* \note The last parameter(s) point to a buffer of sufficient size,
* which on success is filled with the matching filename.
*
* \param filename Name of the file.
* \param fmt Format to look for the file in. OPTIONAL
* \param preflang The perfered language
* \param buf Returns the matching filename
* \param buflen Size of the buf
* \param result_cap OPTIONAL format capabilities result structure
* returns what formats the file was found in.
*
* \retval 1 true. file exists and result format is set
* \retval 0 false. file does not exist.
*/
static int fileexists_core(const char *filename, const char *fmt, const char *preflang,
char *buf, int buflen, struct ast_format_cap *result_cap)
{
char *lang;
if (buf == NULL) {
return 0;
}
/* We try languages in the following order:
* preflang (may include dialect and style codes)
* lang (preflang without dialect - if any)
* <none>
* default (unless the same as preflang or lang without dialect)
*/
lang = ast_strdupa(preflang);
/* Try preferred language, including removing any style or dialect codes */
while (!ast_strlen_zero(lang)) {
char *end;
if (fileexists_test(filename, fmt, lang, buf, buflen, result_cap)) {
return 1;
}
if ((end = strrchr(lang, '_')) != NULL) {
*end = '\0';
continue;
}
break;
}
/* Try without any language */
if (fileexists_test(filename, fmt, NULL, buf, buflen, result_cap)) {
return 1;
}
/* Finally try the default language unless it was already tried before */
if ((ast_strlen_zero(preflang) || strcmp(preflang, DEFAULT_LANGUAGE)) && (ast_strlen_zero(lang) || strcmp(lang, DEFAULT_LANGUAGE))) {
if ((fileexists_test(filename, fmt, DEFAULT_LANGUAGE, buf, buflen, result_cap)) > 0) {
return 1;
}
}
return 0;
}
struct ast_filestream *ast_openstream(struct ast_channel *chan, const char *filename, const char *preflang)
{
return ast_openstream_full(chan, filename, preflang, 0);
}
struct ast_filestream *ast_openstream_full(struct ast_channel *chan, const char *filename, const char *preflang, int asis)
{
/*
* Use fileexists_core() to find a file in a compatible
* language and format, set up a suitable translator,
* and open the stream.
*/
struct ast_format_cap *file_fmt_cap;
int res;
int buflen;
char *buf;
if (!asis) {
/* do this first, otherwise we detect the wrong writeformat */
ast_stopstream(chan);
if (ast_channel_generator(chan))
ast_deactivate_generator(chan);
}
if (preflang == NULL)
preflang = "";
buflen = strlen(preflang) + strlen(filename) + 4;
buf = ast_alloca(buflen);
if (!(file_fmt_cap = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT))) {
return NULL;
}
if (!fileexists_core(filename, NULL, preflang, buf, buflen, file_fmt_cap) ||
!ast_format_cap_has_type(file_fmt_cap, AST_MEDIA_TYPE_AUDIO)) {
ast_log(LOG_WARNING, "File %s does not exist in any format\n", filename);
ao2_ref(file_fmt_cap, -1);
return NULL;
}
/* Set the channel to a format we can work with and save off the previous format. */
ast_channel_lock(chan);
ast_channel_set_oldwriteformat(chan, ast_channel_writeformat(chan));
/* Set the channel to the best format that exists for the file. */
res = ast_set_write_format_from_cap(chan, file_fmt_cap);
ast_channel_unlock(chan);
/* don't need this anymore now that the channel's write format is set. */
ao2_ref(file_fmt_cap, -1);
if (res == -1) { /* No format available that works with this channel */
return NULL;
}
res = filehelper(buf, chan, NULL, ACTION_OPEN);
if (res >= 0)
return ast_channel_stream(chan);
return NULL;
}
struct ast_filestream *ast_openvstream(struct ast_channel *chan, const char *filename, const char *preflang)
{
/* As above, but for video. But here we don't have translators
* so we must enforce a format.
*/
struct ast_format_cap *nativeformats, *tmp_cap;
char *buf;
int buflen;
int i, fd;
if (preflang == NULL) {
preflang = "";
}
buflen = strlen(preflang) + strlen(filename) + 4;
buf = ast_alloca(buflen);
ast_channel_lock(chan);
nativeformats = ao2_bump(ast_channel_nativeformats(chan));
ast_channel_unlock(chan);
/* is the channel capable of video without translation ?*/
if (!ast_format_cap_has_type(nativeformats, AST_MEDIA_TYPE_VIDEO)) {
ao2_cleanup(nativeformats);
return NULL;
}
if (!(tmp_cap = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT))) {
ao2_cleanup(nativeformats);
return NULL;
}
/* Video is supported, so see what video formats exist for this file */
if (!fileexists_core(filename, NULL, preflang, buf, buflen, tmp_cap)) {
ao2_ref(tmp_cap, -1);
ao2_cleanup(nativeformats);
return NULL;
}
/* iterate over file formats and pick the first one compatible with the channel's native formats */
for (i = 0; i < ast_format_cap_count(tmp_cap); ++i) {
struct ast_format *format = ast_format_cap_get_format(tmp_cap, i);
if ((ast_format_get_type(format) != AST_MEDIA_TYPE_VIDEO) ||
!ast_format_cap_iscompatible(nativeformats, tmp_cap)) {
ao2_ref(format, -1);
continue;
}
fd = filehelper(buf, chan, ast_format_get_name(format), ACTION_OPEN);
if (fd >= 0) {
ao2_ref(format, -1);
ao2_ref(tmp_cap, -1);
ao2_cleanup(nativeformats);
return ast_channel_vstream(chan);
}
ast_log(LOG_WARNING, "File %s has video but couldn't be opened\n", filename);
ao2_ref(format, -1);
}
ao2_ref(tmp_cap, -1);
ao2_cleanup(nativeformats);
return NULL;
}
static struct ast_frame *read_frame(struct ast_filestream *s, int *whennext)
{
struct ast_frame *fr, *new_fr;
if (!s || !s->fmt) {
return NULL;
}
if (!(fr = s->fmt->read(s, whennext))) {
return NULL;
}
if (!(new_fr = ast_frisolate(fr))) {
ast_frfree(fr);
return NULL;
}
if (new_fr != fr) {
ast_frfree(fr);
fr = new_fr;
}
return fr;
}
struct ast_frame *ast_readframe(struct ast_filestream *s)
{
int whennext = 0;
return read_frame(s, &whennext);
}
enum fsread_res {
FSREAD_FAILURE,
FSREAD_SUCCESS_SCHED,
FSREAD_SUCCESS_NOSCHED,
};
static int ast_fsread_audio(const void *data);
static enum fsread_res ast_readaudio_callback(struct ast_filestream *s)
{
int whennext = 0;
while (!whennext) {
struct ast_frame *fr;
if (s->orig_chan_name && strcasecmp(ast_channel_name(s->owner), s->orig_chan_name)) {
goto return_failure;
}
fr = read_frame(s, &whennext);
if (!fr /* stream complete */ || ast_write(s->owner, fr) /* error writing */) {
if (fr) {
ast_debug(2, "Failed to write frame\n");
ast_frfree(fr);
}
goto return_failure;
}
if (fr) {
ast_frfree(fr);
}
}
if (whennext != s->lasttimeout) {
if (ast_channel_timingfd(s->owner) > -1) {
float samp_rate = (float) ast_format_get_sample_rate(s->fmt->format);
unsigned int rate;
rate = (unsigned int) roundf(samp_rate / ((float) whennext));
ast_settimeout_full(s->owner, rate, ast_fsread_audio, s, 1);
} else {
ast_channel_streamid_set(s->owner, ast_sched_add(ast_channel_sched(s->owner), whennext / (ast_format_get_sample_rate(s->fmt->format) / 1000), ast_fsread_audio, s));
}
s->lasttimeout = whennext;
return FSREAD_SUCCESS_NOSCHED;
}
return FSREAD_SUCCESS_SCHED;
return_failure:
ast_channel_streamid_set(s->owner, -1);
ast_settimeout(s->owner, 0, NULL, NULL);
return FSREAD_FAILURE;
}
static int ast_fsread_audio(const void *data)
{
struct ast_filestream *fs = (struct ast_filestream *)data;
enum fsread_res res;