Mon Mar 31 07:42:46 2008

Asterisk developer's documentation


translate.h File Reference

Support for translation of data formats. More...

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

Include dependency graph for translate.h:

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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. Name, callbacks, and various options related to run-time operation (size of buffers, auxiliary descriptors, etc). More...

Defines

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

Definition in file translate.h.


Define Documentation

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

Definition at line 168 of file translate.h.

Referenced by load_module(), and register_translator().

#define MAX_AUDIO_FORMAT   15

Definition at line 26 of file translate.h.

Referenced by ast_translator_best_choice().

#define MAX_FORMAT   32

Definition at line 27 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 680 of file translate.c.

References ast_cli_register_multiple(), AST_FORMAT_SLINEAR, ast_getformatname(), AST_LIST_INSERT_BEFORE_CURRENT, AST_LIST_INSERT_HEAD, AST_LIST_LOCK, AST_LIST_TRAVERSE_SAFE_BEGIN, AST_LIST_TRAVERSE_SAFE_END, AST_LIST_UNLOCK, ast_log(), ast_verbose(), calc_cost(), cli_translate, COLOR_BLACK, COLOR_MAGENTA, ast_translator::cost, default_frameout(), ast_translator::dstfmt, LOG_WARNING, MAX_FORMAT, option_verbose, powerof(), rebuild_matrix(), ast_translator::srcfmt, t, term_color(), and VERBOSE_PREFIX_2.

00681 {
00682    static int added_cli = 0;
00683    struct ast_translator *u;
00684 
00685    if (!mod) {
00686       ast_log(LOG_WARNING, "Missing module pointer, you need to supply one\n");
00687       return -1;
00688    }
00689 
00690    if (!t->buf_size) {
00691       ast_log(LOG_WARNING, "empty buf size, you need to supply one\n");
00692       return -1;
00693    }
00694 
00695    t->module = mod;
00696 
00697    t->srcfmt = powerof(t->srcfmt);
00698    t->dstfmt = powerof(t->dstfmt);
00699    t->active = 1;
00700 
00701    if (t->plc_samples) {
00702       if (t->buffer_samples < t->plc_samples) {
00703          ast_log(LOG_WARNING, "plc_samples %d buffer_samples %d\n",
00704             t->plc_samples, t->buffer_samples);
00705          return -1;
00706       }
00707       if (t->dstfmt != powerof(AST_FORMAT_SLINEAR))
00708          ast_log(LOG_WARNING, "plc_samples %d format %x\n",
00709             t->plc_samples, t->dstfmt);
00710    }
00711    if (t->srcfmt >= MAX_FORMAT) {
00712       ast_log(LOG_WARNING, "Source format %s is larger than MAX_FORMAT\n", ast_getformatname(t->srcfmt));
00713       return -1;
00714    }
00715 
00716    if (t->dstfmt >= MAX_FORMAT) {
00717       ast_log(LOG_WARNING, "Destination format %s is larger than MAX_FORMAT\n", ast_getformatname(t->dstfmt));
00718       return -1;
00719    }
00720 
00721    if (t->buf_size) {
00722                /*
00723       * Align buf_size properly, rounding up to the machine-specific
00724       * alignment for pointers.
00725       */
00726       struct _test_align { void *a, *b; } p;
00727       int align = (char *)&p.b - (char *)&p.a;
00728 
00729       t->buf_size = ((t->buf_size + align - 1) / align) * align;
00730    }
00731 
00732    if (t->frameout == NULL)
00733       t->frameout = default_frameout;
00734   
00735    calc_cost(t, 1);
00736 
00737    if (option_verbose > 1) {
00738       char tmp[80];
00739 
00740       ast_verbose(VERBOSE_PREFIX_2 "Registered translator '%s' from format %s to %s, cost %d\n",
00741              term_color(tmp, t->name, COLOR_MAGENTA, COLOR_BLACK, sizeof(tmp)),
00742              ast_getformatname(1 << t->srcfmt), ast_getformatname(1 << t->dstfmt), t->cost);
00743    }
00744 
00745    if (!added_cli) {
00746       ast_cli_register_multiple(cli_translate, sizeof(cli_translate) / sizeof(struct ast_cli_entry));
00747       added_cli++;
00748    }
00749 
00750    AST_LIST_LOCK(&translators);
00751 
00752    /* find any existing translators that provide this same srcfmt/dstfmt,
00753       and put this one in order based on cost */
00754    AST_LIST_TRAVERSE_SAFE_BEGIN(&translators, u, list) {
00755       if ((u->srcfmt == t->srcfmt) &&
00756           (u->dstfmt == t->dstfmt) &&
00757           (u->cost > t->cost)) {
00758          AST_LIST_INSERT_BEFORE_CURRENT(&translators, t, list);
00759          t = NULL;
00760       }
00761    }
00762    AST_LIST_TRAVERSE_SAFE_END;
00763 
00764    /* if no existing translator was found for this format combination,
00765       add it to the beginning of the list */
00766    if (t)
00767       AST_LIST_INSERT_HEAD(&translators, t, list);
00768 
00769    rebuild_matrix(0);
00770 
00771    AST_LIST_UNLOCK(&translators);
00772 
00773    return 0;
00774 }

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

generic frameout function

Definition at line 225 of file translate.c.

References AST_FRAME_VOICE, AST_FRFLAG_FROM_TRANSLATOR, AST_FRIENDLY_OFFSET, ast_set_flag, 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().

00227 {
00228    struct ast_frame *f = &pvt->f;
00229 
00230         if (samples)
00231       f->samples = samples;
00232    else {
00233       if (pvt->samples == 0)
00234          return NULL;
00235       f->samples = pvt->samples;
00236       pvt->samples = 0;
00237    }
00238    if (datalen)
00239       f->datalen = datalen;
00240    else {
00241       f->datalen = pvt->datalen;
00242       pvt->datalen = 0;
00243    }
00244 
00245    f->frametype = AST_FRAME_VOICE;
00246    f->subclass = 1 << (pvt->t->dstfmt);
00247    f->mallocd = 0;
00248    f->offset = AST_FRIENDLY_OFFSET;
00249    f->src = pvt->t->name;
00250    f->data = pvt->outbuf;
00251 
00252    ast_set_flag(f, AST_FRFLAG_FROM_TRANSLATOR);
00253 
00254    return f;
00255 }

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 314 of file translate.c.

References ast_format_rate(), AST_FRAME_CNG, AST_FRFLAG_HAS_TIMING_INFO, ast_frfree, ast_set2_flag, ast_test_flag, ast_tvadd(), ast_tvsub(), 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().

00315 {
00316    struct ast_trans_pvt *p = path;
00317    struct ast_frame *out = f;
00318    struct timeval delivery;
00319    int has_timing_info;
00320    long ts;
00321    long len;
00322    int seqno;
00323 
00324    has_timing_info = ast_test_flag(f, AST_FRFLAG_HAS_TIMING_INFO);
00325    ts = f->ts;
00326    len = f->len;
00327    seqno = f->seqno;
00328 
00329    /* XXX hmmm... check this below */
00330    if (!ast_tvzero(f->delivery)) {
00331       if (!ast_tvzero(path->nextin)) {
00332          /* Make sure this is in line with what we were expecting */
00333          if (!ast_tveq(path->nextin, f->delivery)) {
00334             /* The time has changed between what we expected and this
00335                most recent time on the new packet.  If we have a
00336                valid prediction adjust our output time appropriately */
00337             if (!ast_tvzero(path->nextout)) {
00338                path->nextout = ast_tvadd(path->nextout,
00339                           ast_tvsub(f->delivery, path->nextin));
00340             }
00341             path->nextin = f->delivery;
00342          }
00343       } else {
00344          /* This is our first pass.  Make sure the timing looks good */
00345          path->nextin = f->delivery;
00346          path->nextout = f->delivery;
00347       }
00348       /* Predict next incoming sample */
00349       path->nextin = ast_tvadd(path->nextin, ast_samp2tv(f->samples, ast_format_rate(f->subclass)));
00350    }
00351    delivery = f->delivery;
00352    for ( ; out && p ; p = p->next) {
00353       framein(p, out);
00354       if (out != f)
00355          ast_frfree(out);
00356       out = p->t->frameout(p);
00357    }
00358    if (consume)
00359       ast_frfree(f);
00360    if (out == NULL)
00361       return NULL;
00362    /* we have a frame, play with times */
00363    if (!ast_tvzero(delivery)) {
00364       /* Regenerate prediction after a discontinuity */
00365       if (ast_tvzero(path->nextout))
00366          path->nextout = ast_tvnow();
00367 
00368       /* Use next predicted outgoing timestamp */
00369       out->delivery = path->nextout;
00370       
00371       /* Predict next outgoing timestamp from samples in this
00372          frame. */
00373       path->nextout = ast_tvadd(path->nextout, ast_samp2tv(out->samples, ast_format_rate(out->subclass)));
00374    } else {
00375       out->delivery = ast_tv(0, 0);
00376       ast_set2_flag(out, has_timing_info, AST_FRFLAG_HAS_TIMING_INFO);
00377       if (has_timing_info) {
00378          out->ts = ts;
00379          out->len = len;
00380          out->seqno = seqno;
00381       }
00382    }
00383    /* Invalidate prediction if we're entering a silence period */
00384    if (out->frametype == AST_FRAME_CNG)
00385       path->nextout = ast_tv(0, 0);
00386    return out;
00387 }

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 that 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 885 of file translate.c.

References AST_FORMAT_AUDIO_MASK, AST_FORMAT_MAX_AUDIO, AST_FORMAT_MAX_VIDEO, AST_FORMAT_VIDEO_MASK, AST_LIST_LOCK, AST_LIST_UNLOCK, powerof(), and tr_matrix.

Referenced by sip_call().

00886 {
00887    unsigned int res = dest;
00888    unsigned int x;
00889    unsigned int src_audio = src & AST_FORMAT_AUDIO_MASK;
00890    unsigned int src_video = src & AST_FORMAT_VIDEO_MASK;
00891 
00892    /* if we don't have a source format, we just have to try all
00893       possible destination formats */
00894    if (!src)
00895       return dest;
00896 
00897    /* If we have a source audio format, get its format index */
00898    if (src_audio)
00899       src_audio = powerof(src_audio);
00900 
00901    /* If we have a source video format, get its format index */
00902    if (src_video)
00903       src_video = powerof(src_video);
00904 
00905    AST_LIST_LOCK(&translators);
00906 
00907    /* For a given source audio format, traverse the list of
00908       known audio formats to determine whether there exists
00909       a translation path from the source format to the
00910       destination format. */
00911    for (x = 1; src_audio && x < AST_FORMAT_MAX_AUDIO; x <<= 1) {
00912       /* if this is not a desired format, nothing to do */
00913       if (!dest & x)
00914          continue;
00915 
00916       /* if the source is supplying this format, then
00917          we can leave it in the result */
00918       if (src & x)
00919          continue;
00920 
00921       /* if we don't have a translation path from the src
00922          to this format, remove it from the result */
00923       if (!tr_matrix[src_audio][powerof(x)].step) {
00924          res &= ~x;
00925          continue;
00926       }
00927 
00928       /* now check the opposite direction */
00929       if (!tr_matrix[powerof(x)][src_audio].step)
00930          res &= ~x;
00931    }
00932 
00933    /* For a given source video format, traverse the list of
00934       known video formats to determine whether there exists
00935       a translation path from the source format to the
00936       destination format. */
00937    for (; src_video && x < AST_FORMAT_MAX_VIDEO; x <<= 1) {
00938       /* if this is not a desired format, nothing to do */
00939       if (!dest & x)
00940          continue;
00941 
00942       /* if the source is supplying this format, then
00943          we can leave it in the result */
00944       if (src & x)
00945          continue;
00946 
00947       /* if we don't have a translation path from the src
00948          to this format, remove it from the result */
00949       if (!tr_matrix[src_video][powerof(x)].step) {
00950          res &= ~x;
00951          continue;
00952       }
00953 
00954       /* now check the opposite direction */
00955       if (!tr_matrix[powerof(x)][src_video].step)
00956          res &= ~x;
00957    }
00958 
00959    AST_LIST_UNLOCK(&translators);
00960 
00961    return res;
00962 }

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 964 of file translate.c.

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

Referenced by ast_frame_free().

00965 {
00966    struct ast_trans_pvt *pvt;
00967 
00968    ast_clear_flag(fr, AST_FRFLAG_FROM_TRANSLATOR);
00969 
00970    pvt = (struct ast_trans_pvt *) (((char *) fr) - offsetof(struct ast_trans_pvt, f));
00971 
00972    if (pvt->datalen != -1)
00973       return;
00974    
00975    destroy(pvt);
00976 }

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 867 of file translate.c.

References AST_LIST_LOCK, AST_LIST_UNLOCK, translator_path::multistep, powerof(), and tr_matrix.

Referenced by ast_channel_make_compatible().

00868 {
00869    unsigned int res = -1;
00870 
00871    /* convert bitwise format numbers into array indices */
00872    src = powerof(src);
00873    dest = powerof(dest);
00874 
00875    AST_LIST_LOCK(&translators);
00876 
00877    if (tr_matrix[src][dest].step)
00878       res = tr_matrix[src][dest].multistep + 1;
00879 
00880    AST_LIST_UNLOCK(&translators);
00881 
00882    return res;
00883 }

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 803 of file translate.c.

References AST_LIST_LOCK, AST_LIST_UNLOCK, rebuild_matrix(), and t.

00804 {
00805    AST_LIST_LOCK(&translators);
00806    t->active = 1;
00807    rebuild_matrix(0);
00808    AST_LIST_UNLOCK(&translators);
00809 }

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 820 of file translate.c.

References AST_FORMAT_AUDIO_MASK, AST_LIST_LOCK, AST_LIST_UNLOCK, translator_path::cost, ast_translator::cost, MAX_AUDIO_FORMAT, translator_path::multistep, and tr_matrix.

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

00821 {
00822    int x,y;
00823    int best = -1;
00824    int bestdst = 0;
00825    int cur, cursrc;
00826    int besttime = INT_MAX;
00827    int beststeps = INT_MAX;
00828    int common = ((*dst) & (*srcs)) & AST_FORMAT_AUDIO_MASK; /* are there common formats ? */
00829 
00830    if (common) { /* yes, pick one and return */
00831       for (cur = 1, y = 0; y <= MAX_AUDIO_FORMAT; cur <<= 1, y++) {
00832          if (cur & common) /* guaranteed to find one */
00833             break;
00834       }
00835       /* We are done, this is a common format to both. */
00836       *srcs = *dst = cur;
00837       return 0;
00838    } else { /* No, we will need to translate */
00839       AST_LIST_LOCK(&translators);
00840       for (cur = 1, y = 0; y <= MAX_AUDIO_FORMAT; cur <<= 1, y++) {
00841          if (! (cur & *dst))
00842             continue;
00843          for (cursrc = 1, x = 0; x <= MAX_AUDIO_FORMAT; cursrc <<= 1, x++) {
00844             if (!(*srcs & cursrc) || !tr_matrix[x][y].step ||
00845                 tr_matrix[x][y].cost >  besttime)
00846                continue;   /* not existing or no better */
00847             if (tr_matrix[x][y].cost < besttime ||
00848                 tr_matrix[x][y].multistep < beststeps) {
00849                /* better than what we have so far */
00850                best = cursrc;
00851                bestdst = cur;
00852                besttime = tr_matrix[x][y].cost;
00853                beststeps = tr_matrix[x][y].multistep;
00854             }
00855          }
00856       }
00857       AST_LIST_UNLOCK(&translators);
00858       if (best > -1) {
00859          *srcs = best;
00860          *dst = bestdst;
00861          best = 0;
00862       }
00863       return best;
00864    }
00865 }

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 274 of file translate.c.

References ast_getformatname(), AST_LIST_LOCK, AST_LIST_UNLOCK, ast_log(), ast_translator_free_path(), 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, 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().

00275 {
00276    struct ast_trans_pvt *head = NULL, *tail = NULL;
00277    
00278    source = powerof(source);
00279    dest = powerof(dest);
00280    
00281    AST_LIST_LOCK(&translators);
00282 
00283    while (source != dest) {
00284       struct ast_trans_pvt *cur;
00285       struct ast_translator *t = tr_matrix[source][dest].step;
00286       if (!t) {
00287          ast_log(LOG_WARNING, "No translator path from %s to %s\n", 
00288             ast_getformatname(source), ast_getformatname(dest));
00289          AST_LIST_UNLOCK(&translators);
00290          return NULL;
00291       }
00292       if (!(cur = newpvt(t))) {
00293          ast_log(LOG_WARNING, "Failed to build translator step from %d to %d\n", source, dest);
00294          if (head)
00295             ast_translator_free_path(head);  
00296          AST_LIST_UNLOCK(&translators);
00297          return NULL;
00298       }
00299       if (!head)
00300          head = cur;
00301       else
00302          tail->next = cur;
00303       tail = cur;
00304       cur->nextin = cur->nextout = ast_tv(0, 0);
00305       /* Keep going if this isn't the final destination */
00306       source = cur->t->dstfmt;
00307    }
00308 
00309    AST_LIST_UNLOCK(&translators);
00310    return head;
00311 }

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 811 of file translate.c.

References AST_LIST_LOCK, AST_LIST_UNLOCK, rebuild_matrix(), and t.

00812 {
00813    AST_LIST_LOCK(&translators);
00814    t->active = 0;
00815    rebuild_matrix(0);
00816    AST_LIST_UNLOCK(&translators);
00817 }

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 264 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_closestream(), ast_slinfactory_destroy(), ast_slinfactory_feed(), ast_translator_build_path(), ast_writestream(), audio_audiohook_write_list(), cl_dequeue_chan(), conf_free(), free_translation(), and set_format().

00265 {
00266    struct ast_trans_pvt *pn = p;
00267    while ( (p = pn) ) {
00268       pn = p->next;
00269       destroy(p);
00270    }
00271 }

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 777 of file translate.c.

References ast_getformatname(), AST_LIST_LOCK, AST_LIST_REMOVE_CURRENT, AST_LIST_TRAVERSE_SAFE_BEGIN, AST_LIST_TRAVERSE_SAFE_END, AST_LIST_UNLOCK, ast_verbose(), COLOR_BLACK, COLOR_MAGENTA, option_verbose, rebuild_matrix(), t, term_color(), and VERBOSE_PREFIX_2.

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

00778 {
00779    char tmp[80];
00780    struct ast_translator *u;
00781    int found = 0;
00782 
00783    AST_LIST_LOCK(&translators);
00784    AST_LIST_TRAVERSE_SAFE_BEGIN(&translators, u, list) {
00785       if (u == t) {
00786          AST_LIST_REMOVE_CURRENT(&translators, list);
00787          if (option_verbose > 1)
00788             ast_verbose(VERBOSE_PREFIX_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));
00789          found = 1;
00790          break;
00791       }
00792    }
00793    AST_LIST_TRAVERSE_SAFE_END;
00794 
00795    if (found)
00796       rebuild_matrix(0);
00797 
00798    AST_LIST_UNLOCK(&translators);
00799 
00800    return (u ? 0 : -1);
00801 }


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