Fri Jul 24 00:42:00 2009

Asterisk developer's documentation


translate.h File Reference

Support for translation of data formats. translate.c. More...

#include "asterisk/frame.h"
#include "asterisk/plc.h"
#include "asterisk/linkedlists.h"

Go to the source code of this file.

Data Structures

struct  ast_trans_pvt
 Default structure for translators, with the basic fields and buffers, all allocated as part of the same chunk of memory. The buffer is preceded by AST_FRIENDLY_OFFSET bytes in front of the user portion. 'buf' points right after this space. More...
struct  ast_translator
 Descriptor of a translator. More...

Defines

#define ast_register_translator(t)   __ast_register_translator(t, ast_module_info->self)
 See __ast_register_translator().
#define MAX_AUDIO_FORMAT   15
#define MAX_FORMAT   32

Functions

int __ast_register_translator (struct ast_translator *t, struct ast_module *module)
 Register a translator This registers a codec translator with asterisk.
ast_frameast_trans_frameout (struct ast_trans_pvt *pvt, int datalen, int samples)
 generic frameout function
ast_frameast_translate (struct ast_trans_pvt *tr, struct ast_frame *f, int consume)
 translates one or more frames Apply an input frame into the translator and receive zero or one output frames. Consume determines whether the original frame should be freed
unsigned int ast_translate_available_formats (unsigned int dest, unsigned int src)
 Mask off unavailable formats from a format bitmask.
void ast_translate_frame_freed (struct ast_frame *fr)
 Hint that a frame from a translator has been freed.
unsigned int ast_translate_path_steps (unsigned int dest, unsigned int src)
 Returns the number of steps required to convert from 'src' to 'dest'.
void ast_translator_activate (struct ast_translator *t)
 Activate a previously deactivated translator.
int ast_translator_best_choice (int *dsts, int *srcs)
 Chooses the best translation path.
ast_trans_pvtast_translator_build_path (int dest, int source)
 Builds a translator path Build a path (possibly NULL) from source to dest.
void ast_translator_deactivate (struct ast_translator *t)
 Deactivate a translator.
void ast_translator_free_path (struct ast_trans_pvt *tr)
 Frees a translator path Frees the given translator path structure.
int ast_unregister_translator (struct ast_translator *t)
 Unregister a translator Unregisters the given tranlator.


Detailed Description

Support for translation of data formats. translate.c.

Definition in file translate.h.


Define Documentation

#define ast_register_translator (  )     __ast_register_translator(t, ast_module_info->self)

See __ast_register_translator().

Definition at line 173 of file translate.h.

Referenced by load_module(), and register_translator().

#define MAX_AUDIO_FORMAT   15

Definition at line 27 of file translate.h.

Referenced by ast_translator_best_choice().

#define MAX_FORMAT   32

Definition at line 28 of file translate.h.

Referenced by __ast_register_translator(), and rebuild_matrix().


Function Documentation

int __ast_register_translator ( struct ast_translator t,
struct ast_module module 
)

Register a translator This registers a codec translator with asterisk.

Parameters:
t populated ast_translator structure
module handle to the module that owns this translator
Returns:
0 on success, -1 on failure

Definition at line 621 of file translate.c.

References ast_translator::active, ast_cli_register_multiple(), AST_FORMAT_SLINEAR, ast_getformatname(), ast_log(), AST_RWLIST_INSERT_BEFORE_CURRENT, AST_RWLIST_INSERT_HEAD, AST_RWLIST_TRAVERSE_SAFE_BEGIN, AST_RWLIST_TRAVERSE_SAFE_END, AST_RWLIST_UNLOCK, AST_RWLIST_WRLOCK, ast_verb, ast_translator::buf_size, ast_translator::buffer_samples, calc_cost(), cli_translate, COLOR_BLACK, COLOR_MAGENTA, ast_translator::cost, default_frameout(), ast_translator::dstfmt, ast_translator::frameout, LOG_WARNING, MAX_FORMAT, ast_translator::module, ast_translator::name, ast_translator::plc_samples, powerof(), rebuild_matrix(), ast_translator::srcfmt, and term_color().

00622 {
00623    static int added_cli = 0;
00624    struct ast_translator *u;
00625    char tmp[80];
00626 
00627    if (!mod) {
00628       ast_log(LOG_WARNING, "Missing module pointer, you need to supply one\n");
00629       return -1;
00630    }
00631 
00632    if (!t->buf_size) {
00633       ast_log(LOG_WARNING, "empty buf size, you need to supply one\n");
00634       return -1;
00635    }
00636 
00637    t->module = mod;
00638 
00639    t->srcfmt = powerof(t->srcfmt);
00640    t->dstfmt = powerof(t->dstfmt);
00641    t->active = 1;
00642 
00643    if (t->srcfmt == -1 || t->dstfmt == -1) {
00644       ast_log(LOG_WARNING, "Invalid translator path: (%s codec is not valid)\n", t->srcfmt == -1 ? "starting" : "ending");
00645       return -1;
00646    }
00647    if (t->plc_samples) {
00648       if (t->buffer_samples < t->plc_samples) {
00649          ast_log(LOG_WARNING, "plc_samples %d buffer_samples %d\n",
00650             t->plc_samples, t->buffer_samples);
00651          return -1;
00652       }
00653       if (t->dstfmt != powerof(AST_FORMAT_SLINEAR))
00654          ast_log(LOG_WARNING, "plc_samples %d format %x\n",
00655             t->plc_samples, t->dstfmt);
00656    }
00657    if (t->srcfmt >= MAX_FORMAT) {
00658       ast_log(LOG_WARNING, "Source format %s is larger than MAX_FORMAT\n", ast_getformatname(t->srcfmt));
00659       return -1;
00660    }
00661 
00662    if (t->dstfmt >= MAX_FORMAT) {
00663       ast_log(LOG_WARNING, "Destination format %s is larger than MAX_FORMAT\n", ast_getformatname(t->dstfmt));
00664       return -1;
00665    }
00666 
00667    if (t->buf_size) {
00668       /*
00669        * Align buf_size properly, rounding up to the machine-specific
00670        * alignment for pointers.
00671        */
00672       struct _test_align { void *a, *b; } p;
00673       int align = (char *)&p.b - (char *)&p.a;
00674 
00675       t->buf_size = ((t->buf_size + align - 1) / align) * align;
00676    }
00677 
00678    if (t->frameout == NULL)
00679       t->frameout = default_frameout;
00680   
00681    calc_cost(t, 1);
00682 
00683    ast_verb(2, "Registered translator '%s' from format %s to %s, cost %d\n",
00684              term_color(tmp, t->name, COLOR_MAGENTA, COLOR_BLACK, sizeof(tmp)),
00685              ast_getformatname(1 << t->srcfmt), ast_getformatname(1 << t->dstfmt), t->cost);
00686 
00687    if (!added_cli) {
00688       ast_cli_register_multiple(cli_translate, sizeof(cli_translate) / sizeof(struct ast_cli_entry));
00689       added_cli++;
00690    }
00691 
00692    AST_RWLIST_WRLOCK(&translators);
00693 
00694    /* find any existing translators that provide this same srcfmt/dstfmt,
00695       and put this one in order based on cost */
00696    AST_RWLIST_TRAVERSE_SAFE_BEGIN(&translators, u, list) {
00697       if ((u->srcfmt == t->srcfmt) &&
00698           (u->dstfmt == t->dstfmt) &&
00699           (u->cost > t->cost)) {
00700          AST_RWLIST_INSERT_BEFORE_CURRENT(t, list);
00701          t = NULL;
00702       }
00703    }
00704    AST_RWLIST_TRAVERSE_SAFE_END;
00705 
00706    /* if no existing translator was found for this format combination,
00707       add it to the beginning of the list */
00708    if (t)
00709       AST_RWLIST_INSERT_HEAD(&translators, t, list);
00710 
00711    rebuild_matrix(0);
00712 
00713    AST_RWLIST_UNLOCK(&translators);
00714 
00715    return 0;
00716 }

struct ast_frame* ast_trans_frameout ( struct ast_trans_pvt pvt,
int  datalen,
int  samples 
)

generic frameout function

Definition at line 214 of file translate.c.

References AST_FRAME_VOICE, AST_FRFLAG_FROM_TRANSLATOR, AST_FRIENDLY_OFFSET, ast_set_flag, ast_trans_pvt::c, ast_trans_pvt::datalen, ast_translator::dstfmt, ast_trans_pvt::f, f, ast_translator::name, ast_trans_pvt::outbuf, ast_trans_pvt::samples, and ast_trans_pvt::t.

Referenced by default_frameout(), lintoadpcm_frameout(), lintogsm_frameout(), lintoilbc_frameout(), and lintolpc10_frameout().

00216 {
00217    struct ast_frame *f = &pvt->f;
00218 
00219    if (samples)
00220       f->samples = samples;
00221    else {
00222       if (pvt->samples == 0)
00223          return NULL;
00224       f->samples = pvt->samples;
00225       pvt->samples = 0;
00226    }
00227    if (datalen)
00228       f->datalen = datalen;
00229    else {
00230       f->datalen = pvt->datalen;
00231       pvt->datalen = 0;
00232    }
00233 
00234    f->frametype = AST_FRAME_VOICE;
00235    f->subclass = 1 << (pvt->t->dstfmt);
00236    f->mallocd = 0;
00237    f->offset = AST_FRIENDLY_OFFSET;
00238    f->src = pvt->t->name;
00239    f->data.ptr = pvt->outbuf.c;
00240 
00241    ast_set_flag(f, AST_FRFLAG_FROM_TRANSLATOR);
00242 
00243    return f;
00244 }

struct ast_frame* ast_translate ( struct ast_trans_pvt tr,
struct ast_frame f,
int  consume 
)

translates one or more frames Apply an input frame into the translator and receive zero or one output frames. Consume determines whether the original frame should be freed

Parameters:
tr translator structure to use for translation
f frame to translate
consume Whether or not to free the original frame
Returns:
an ast_frame of the new translation format on success, NULL on failure

Definition at line 308 of file translate.c.

References ast_format_rate(), AST_FRAME_CNG, AST_FRFLAG_HAS_TIMING_INFO, ast_frfree, ast_samp2tv(), ast_set2_flag, ast_test_flag, ast_tv(), ast_tvadd(), ast_tveq(), ast_tvnow(), ast_tvsub(), ast_tvzero(), ast_frame::delivery, f, framein(), ast_frame::frametype, ast_frame::len, len(), ast_trans_pvt::next, ast_trans_pvt::nextin, ast_trans_pvt::nextout, ast_frame::samples, ast_frame::seqno, ast_frame::subclass, and ast_frame::ts.

Referenced by __ast_read(), ast_audiohook_read_frame(), ast_slinfactory_feed(), ast_write(), ast_writestream(), audio_audiohook_write_list(), conf_run(), and process_ast_dsp().

00309 {
00310    struct ast_trans_pvt *p = path;
00311    struct ast_frame *out = f;
00312    struct timeval delivery;
00313    int has_timing_info;
00314    long ts;
00315    long len;
00316    int seqno;
00317 
00318    has_timing_info = ast_test_flag(f, AST_FRFLAG_HAS_TIMING_INFO);
00319    ts = f->ts;
00320    len = f->len;
00321    seqno = f->seqno;
00322 
00323    /* XXX hmmm... check this below */
00324    if (!ast_tvzero(f->delivery)) {
00325       if (!ast_tvzero(path->nextin)) {
00326          /* Make sure this is in line with what we were expecting */
00327          if (!ast_tveq(path->nextin, f->delivery)) {
00328             /* The time has changed between what we expected and this
00329                most recent time on the new packet.  If we have a
00330                valid prediction adjust our output time appropriately */
00331             if (!ast_tvzero(path->nextout)) {
00332                path->nextout = ast_tvadd(path->nextout,
00333                           ast_tvsub(f->delivery, path->nextin));
00334             }
00335             path->nextin = f->delivery;
00336          }
00337       } else {
00338          /* This is our first pass.  Make sure the timing looks good */
00339          path->nextin = f->delivery;
00340          path->nextout = f->delivery;
00341       }
00342       /* Predict next incoming sample */
00343       path->nextin = ast_tvadd(path->nextin, ast_samp2tv(f->samples, ast_format_rate(f->subclass)));
00344    }
00345    delivery = f->delivery;
00346    for ( ; out && p ; p = p->next) {
00347       framein(p, out);
00348       if (out != f)
00349          ast_frfree(out);
00350       out = p->t->frameout(p);
00351    }
00352    if (consume)
00353       ast_frfree(f);
00354    if (out == NULL)
00355       return NULL;
00356    /* we have a frame, play with times */
00357    if (!ast_tvzero(delivery)) {
00358       /* Regenerate prediction after a discontinuity */
00359       if (ast_tvzero(path->nextout))
00360          path->nextout = ast_tvnow();
00361 
00362       /* Use next predicted outgoing timestamp */
00363       out->delivery = path->nextout;
00364       
00365       /* Predict next outgoing timestamp from samples in this
00366          frame. */
00367       path->nextout = ast_tvadd(path->nextout, ast_samp2tv(out->samples, ast_format_rate(out->subclass)));
00368    } else {
00369       out->delivery = ast_tv(0, 0);
00370       ast_set2_flag(out, has_timing_info, AST_FRFLAG_HAS_TIMING_INFO);
00371       if (has_timing_info) {
00372          out->ts = ts;
00373          out->len = len;
00374          out->seqno = seqno;
00375       }
00376    }
00377    /* Invalidate prediction if we're entering a silence period */
00378    if (out->frametype == AST_FRAME_CNG)
00379       path->nextout = ast_tv(0, 0);
00380    return out;
00381 }

unsigned int ast_translate_available_formats ( unsigned int  dest,
unsigned int  src 
)

Mask off unavailable formats from a format bitmask.

Parameters:
dest possible destination formats
src source formats
Returns:
the destination formats that are available in the source or translatable
The result will include all formats from 'dest' that are either present in 'src' or translatable from a format present in 'src'.

Note:
Only a single audio format and a single video format can be present in 'src', or the function will produce unexpected results.

Definition at line 830 of file translate.c.

References AST_FORMAT_AUDIO_MASK, AST_FORMAT_VIDEO_MASK, AST_RWLIST_RDLOCK, AST_RWLIST_UNLOCK, powerof(), and tr_matrix.

Referenced by sip_call().

00831 {
00832    unsigned int res = dest;
00833    unsigned int x;
00834    unsigned int src_audio = src & AST_FORMAT_AUDIO_MASK;
00835    unsigned int src_video = src & AST_FORMAT_VIDEO_MASK;
00836 
00837    /* if we don't have a source format, we just have to try all
00838       possible destination formats */
00839    if (!src)
00840       return dest;
00841 
00842    /* If we have a source audio format, get its format index */
00843    if (src_audio)
00844       src_audio = powerof(src_audio);
00845 
00846    /* If we have a source video format, get its format index */
00847    if (src_video)
00848       src_video = powerof(src_video);
00849 
00850    AST_RWLIST_RDLOCK(&translators);
00851 
00852    /* For a given source audio format, traverse the list of
00853       known audio formats to determine whether there exists
00854       a translation path from the source format to the
00855       destination format. */
00856    for (x = 1; src_audio && (x & AST_FORMAT_AUDIO_MASK); x <<= 1) {
00857       /* if this is not a desired format, nothing to do */
00858       if (!dest & x)
00859          continue;
00860 
00861       /* if the source is supplying this format, then
00862          we can leave it in the result */
00863       if (src & x)
00864          continue;
00865 
00866       /* if we don't have a translation path from the src
00867          to this format, remove it from the result */
00868       if (!tr_matrix[src_audio][powerof(x)].step) {
00869          res &= ~x;
00870          continue;
00871       }
00872 
00873       /* now check the opposite direction */
00874       if (!tr_matrix[powerof(x)][src_audio].step)
00875          res &= ~x;
00876    }
00877 
00878    /* For a given source video format, traverse the list of
00879       known video formats to determine whether there exists
00880       a translation path from the source format to the
00881       destination format. */
00882    for (; src_video && (x & AST_FORMAT_VIDEO_MASK); x <<= 1) {
00883       /* if this is not a desired format, nothing to do */
00884       if (!dest & x)
00885          continue;
00886 
00887       /* if the source is supplying this format, then
00888          we can leave it in the result */
00889       if (src & x)
00890          continue;
00891 
00892       /* if we don't have a translation path from the src
00893          to this format, remove it from the result */
00894       if (!tr_matrix[src_video][powerof(x)].step) {
00895          res &= ~x;
00896          continue;
00897       }
00898 
00899       /* now check the opposite direction */
00900       if (!tr_matrix[powerof(x)][src_video].step)
00901          res &= ~x;
00902    }
00903 
00904    AST_RWLIST_UNLOCK(&translators);
00905 
00906    return res;
00907 }

void ast_translate_frame_freed ( struct ast_frame fr  ) 

Hint that a frame from a translator has been freed.

This is sort of a hack. This function gets called when ast_frame_free() gets called on a frame that has the AST_FRFLAG_FROM_TRANSLATOR flag set. This is because it is possible for a translation path to be destroyed while a frame from a translator is still in use. Specifically, this happens if a masquerade happens after a call to ast_read() but before the frame is done being processed, since the frame processing is generally done without the channel lock held.

Returns:
nothing

Definition at line 909 of file translate.c.

References ast_clear_flag, AST_FRFLAG_FROM_TRANSLATOR, destroy(), f, and ast_trans_pvt::pvt.

Referenced by ast_frame_free().

00910 {
00911    struct ast_trans_pvt *pvt;
00912 
00913    ast_clear_flag(fr, AST_FRFLAG_FROM_TRANSLATOR);
00914 
00915    pvt = (struct ast_trans_pvt *) (((char *) fr) - offsetof(struct ast_trans_pvt, f));
00916 
00917    if (!pvt->destroy)
00918       return;
00919    
00920    destroy(pvt);
00921 }

unsigned int ast_translate_path_steps ( unsigned int  dest,
unsigned int  src 
)

Returns the number of steps required to convert from 'src' to 'dest'.

Parameters:
dest destination format
src source format
Returns:
the number of translation steps required, or -1 if no path is available

Definition at line 808 of file translate.c.

References ast_log(), AST_RWLIST_RDLOCK, AST_RWLIST_UNLOCK, LOG_WARNING, translator_path::multistep, powerof(), and tr_matrix.

Referenced by ast_channel_make_compatible_helper().

00809 {
00810    unsigned int res = -1;
00811 
00812    /* convert bitwise format numbers into array indices */
00813    src = powerof(src);
00814    dest = powerof(dest);
00815 
00816    if (src == -1 || dest == -1) {
00817       ast_log(LOG_WARNING, "No translator path: (%s codec is not valid)\n", src == -1 ? "starting" : "ending");
00818       return -1;
00819    }
00820    AST_RWLIST_RDLOCK(&translators);
00821 
00822    if (tr_matrix[src][dest].step)
00823       res = tr_matrix[src][dest].multistep + 1;
00824 
00825    AST_RWLIST_UNLOCK(&translators);
00826 
00827    return res;
00828 }

void ast_translator_activate ( struct ast_translator t  ) 

Activate a previously deactivated translator.

Parameters:
t translator to activate
Returns:
nothing
Enables the specified translator for use.

Definition at line 744 of file translate.c.

References ast_translator::active, AST_RWLIST_UNLOCK, AST_RWLIST_WRLOCK, and rebuild_matrix().

00745 {
00746    AST_RWLIST_WRLOCK(&translators);
00747    t->active = 1;
00748    rebuild_matrix(0);
00749    AST_RWLIST_UNLOCK(&translators);
00750 }

int ast_translator_best_choice ( int *  dsts,
int *  srcs 
)

Chooses the best translation path.

Given a list of sources, and a designed destination format, which should I choose?

Returns:
Returns 0 on success, -1 if no path could be found.
Note:
Modifies dests and srcs in place

Definition at line 761 of file translate.c.

References AST_FORMAT_AUDIO_MASK, AST_RWLIST_RDLOCK, AST_RWLIST_UNLOCK, translator_path::cost, ast_translator::cost, MAX_AUDIO_FORMAT, translator_path::multistep, and tr_matrix.

Referenced by ast_channel_make_compatible_helper(), ast_request(), iax2_request(), and set_format().

00762 {
00763    int x,y;
00764    int best = -1;
00765    int bestdst = 0;
00766    int cur, cursrc;
00767    int besttime = INT_MAX;
00768    int beststeps = INT_MAX;
00769    int common = ((*dst) & (*srcs)) & AST_FORMAT_AUDIO_MASK; /* are there common formats ? */
00770 
00771    if (common) { /* yes, pick one and return */
00772       for (cur = 1, y = 0; y <= MAX_AUDIO_FORMAT; cur <<= 1, y++) {
00773          if (cur & common) /* guaranteed to find one */
00774             break;
00775       }
00776       /* We are done, this is a common format to both. */
00777       *srcs = *dst = cur;
00778       return 0;
00779    } else { /* No, we will need to translate */
00780       AST_RWLIST_RDLOCK(&translators);
00781       for (cur = 1, y = 0; y <= MAX_AUDIO_FORMAT; cur <<= 1, y++) {
00782          if (! (cur & *dst))
00783             continue;
00784          for (cursrc = 1, x = 0; x <= MAX_AUDIO_FORMAT; cursrc <<= 1, x++) {
00785             if (!(*srcs & cursrc) || !tr_matrix[x][y].step ||
00786                 tr_matrix[x][y].cost >  besttime)
00787                continue;   /* not existing or no better */
00788             if (tr_matrix[x][y].cost < besttime ||
00789                 tr_matrix[x][y].multistep < beststeps) {
00790                /* better than what we have so far */
00791                best = cursrc;
00792                bestdst = cur;
00793                besttime = tr_matrix[x][y].cost;
00794                beststeps = tr_matrix[x][y].multistep;
00795             }
00796          }
00797       }
00798       AST_RWLIST_UNLOCK(&translators);
00799       if (best > -1) {
00800          *srcs = best;
00801          *dst = bestdst;
00802          best = 0;
00803       }
00804       return best;
00805    }
00806 }

struct ast_trans_pvt* ast_translator_build_path ( int  dest,
int  source 
)

Builds a translator path Build a path (possibly NULL) from source to dest.

Parameters:
dest destination format
source source format
Returns:
ast_trans_pvt on success, NULL on failure

Definition at line 263 of file translate.c.

References ast_getformatname(), ast_log(), AST_RWLIST_RDLOCK, AST_RWLIST_UNLOCK, ast_translator_free_path(), ast_tv(), ast_translator::dstfmt, LOG_WARNING, newpvt(), ast_trans_pvt::next, ast_trans_pvt::nextin, ast_trans_pvt::nextout, powerof(), translator_path::step, ast_trans_pvt::t, and tr_matrix.

Referenced by ast_audiohook_read_frame(), ast_slinfactory_feed(), ast_writestream(), audio_audiohook_write_list(), conf_run(), misdn_set_opt_exec(), read_config(), and set_format().

00264 {
00265    struct ast_trans_pvt *head = NULL, *tail = NULL;
00266    
00267    source = powerof(source);
00268    dest = powerof(dest);
00269 
00270    if (source == -1 || dest == -1) {
00271       ast_log(LOG_WARNING, "No translator path: (%s codec is not valid)\n", source == -1 ? "starting" : "ending");
00272       return NULL;
00273    }
00274 
00275    AST_RWLIST_RDLOCK(&translators);
00276 
00277    while (source != dest) {
00278       struct ast_trans_pvt *cur;
00279       struct ast_translator *t = tr_matrix[source][dest].step;
00280       if (!t) {
00281          ast_log(LOG_WARNING, "No translator path from %s to %s\n", 
00282             ast_getformatname(source), ast_getformatname(dest));
00283          AST_RWLIST_UNLOCK(&translators);
00284          return NULL;
00285       }
00286       if (!(cur = newpvt(t))) {
00287          ast_log(LOG_WARNING, "Failed to build translator step from %d to %d\n", source, dest);
00288          if (head)
00289             ast_translator_free_path(head);  
00290          AST_RWLIST_UNLOCK(&translators);
00291          return NULL;
00292       }
00293       if (!head)
00294          head = cur;
00295       else
00296          tail->next = cur;
00297       tail = cur;
00298       cur->nextin = cur->nextout = ast_tv(0, 0);
00299       /* Keep going if this isn't the final destination */
00300       source = cur->t->dstfmt;
00301    }
00302 
00303    AST_RWLIST_UNLOCK(&translators);
00304    return head;
00305 }

void ast_translator_deactivate ( struct ast_translator t  ) 

Deactivate a translator.

Parameters:
t translator to deactivate
Returns:
nothing
Disables the specified translator from being used.

Definition at line 752 of file translate.c.

References ast_translator::active, AST_RWLIST_UNLOCK, AST_RWLIST_WRLOCK, and rebuild_matrix().

00753 {
00754    AST_RWLIST_WRLOCK(&translators);
00755    t->active = 0;
00756    rebuild_matrix(0);
00757    AST_RWLIST_UNLOCK(&translators);
00758 }

void ast_translator_free_path ( struct ast_trans_pvt tr  ) 

Frees a translator path Frees the given translator path structure.

Parameters:
tr translator path to get rid of

Definition at line 253 of file translate.c.

References destroy(), and ast_trans_pvt::next.

Referenced by ast_audiohook_destroy(), ast_audiohook_detach_list(), ast_audiohook_read_frame(), ast_channel_free(), ast_slinfactory_destroy(), ast_slinfactory_feed(), ast_slinfactory_flush(), ast_translator_build_path(), ast_writestream(), audio_audiohook_write_list(), cl_dequeue_chan(), conf_free(), filestream_destructor(), free_translation(), and set_format().

00254 {
00255    struct ast_trans_pvt *pn = p;
00256    while ( (p = pn) ) {
00257       pn = p->next;
00258       destroy(p);
00259    }
00260 }

int ast_unregister_translator ( struct ast_translator t  ) 

Unregister a translator Unregisters the given tranlator.

Parameters:
t translator to unregister
Returns:
0 on success, -1 on failure

Definition at line 719 of file translate.c.

References ast_getformatname(), AST_RWLIST_REMOVE_CURRENT, AST_RWLIST_TRAVERSE_SAFE_BEGIN, AST_RWLIST_TRAVERSE_SAFE_END, AST_RWLIST_UNLOCK, AST_RWLIST_WRLOCK, ast_verb, COLOR_BLACK, COLOR_MAGENTA, ast_translator::dstfmt, ast_translator::list, ast_translator::name, rebuild_matrix(), ast_translator::srcfmt, and term_color().

Referenced by drop_translator(), load_module(), unload_module(), and unregister_translators().

00720 {
00721    char tmp[80];
00722    struct ast_translator *u;
00723    int found = 0;
00724 
00725    AST_RWLIST_WRLOCK(&translators);
00726    AST_RWLIST_TRAVERSE_SAFE_BEGIN(&translators, u, list) {
00727       if (u == t) {
00728          AST_RWLIST_REMOVE_CURRENT(list);
00729          ast_verb(2, "Unregistered translator '%s' from format %s to %s\n", term_color(tmp, t->name, COLOR_MAGENTA, COLOR_BLACK, sizeof(tmp)), ast_getformatname(1 << t->srcfmt), ast_getformatname(1 << t->dstfmt));
00730          found = 1;
00731          break;
00732       }
00733    }
00734    AST_RWLIST_TRAVERSE_SAFE_END;
00735 
00736    if (found)
00737       rebuild_matrix(0);
00738 
00739    AST_RWLIST_UNLOCK(&translators);
00740 
00741    return (u ? 0 : -1);
00742 }


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