Wed Mar 4 19:57:57 2009

Asterisk developer's documentation


abstract_jb.c

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00001 /*
00002  * abstract_jb: common implementation-independent jitterbuffer stuff
00003  *
00004  * Copyright (C) 2005, Attractel OOD
00005  *
00006  * Contributors:
00007  * Slav Klenov <slav@securax.org>
00008  *
00009  * See http://www.asterisk.org for more information about
00010  * the Asterisk project. Please do not directly contact
00011  * any of the maintainers of this project for assistance;
00012  * the project provides a web site, mailing lists and IRC
00013  * channels for your use.
00014  *
00015  * This program is free software, distributed under the terms of
00016  * the GNU General Public License Version 2. See the LICENSE file
00017  * at the top of the source tree.
00018  *
00019  * A license has been granted to Digium (via disclaimer) for the use of
00020  * this code.
00021  */
00022 
00023 /*! \file
00024  *
00025  * \brief Common implementation-independent jitterbuffer stuff.
00026  * 
00027  * \author Slav Klenov <slav@securax.org>
00028  */
00029 
00030 #include "asterisk.h"
00031 
00032 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 135841 $")
00033 
00034 #include <stdio.h>
00035 #include <stdlib.h>
00036 
00037 #include "asterisk/frame.h"
00038 #include "asterisk/channel.h"
00039 #include "asterisk/logger.h"
00040 #include "asterisk/term.h"
00041 #include "asterisk/options.h"
00042 #include "asterisk/utils.h"
00043 
00044 #include "asterisk/abstract_jb.h"
00045 #include "fixedjitterbuf.h"
00046 #include "jitterbuf.h"
00047 
00048 /*! Internal jb flags */
00049 enum {
00050    JB_USE =                  (1 << 0),
00051    JB_TIMEBASE_INITIALIZED = (1 << 1),
00052    JB_CREATED =              (1 << 2)
00053 };
00054 
00055 /* Hooks for the abstract jb implementation */
00056 
00057 /*! \brief Create */
00058 typedef void * (*jb_create_impl)(struct ast_jb_conf *general_config, long resynch_threshold);
00059 /*! \brief Destroy */
00060 typedef void (*jb_destroy_impl)(void *jb);
00061 /*! \brief Put first frame */
00062 typedef int (*jb_put_first_impl)(void *jb, struct ast_frame *fin, long now);
00063 /*! \brief Put frame */
00064 typedef int (*jb_put_impl)(void *jb, struct ast_frame *fin, long now);
00065 /*! \brief Get frame for now */
00066 typedef int (*jb_get_impl)(void *jb, struct ast_frame **fout, long now, long interpl);
00067 /*! \brief Get next */
00068 typedef long (*jb_next_impl)(void *jb);
00069 /*! \brief Remove first frame */
00070 typedef int (*jb_remove_impl)(void *jb, struct ast_frame **fout);
00071 /*! \brief Force resynch */
00072 typedef void (*jb_force_resynch_impl)(void *jb);
00073 /*! \brief Empty and reset jb */
00074 typedef void (*jb_empty_and_reset_impl)(void *jb);
00075 
00076 /*!
00077  * \brief Jitterbuffer implementation private struct.
00078  */
00079 struct ast_jb_impl
00080 {
00081    char name[AST_JB_IMPL_NAME_SIZE];
00082    jb_create_impl create;
00083    jb_destroy_impl destroy;
00084    jb_put_first_impl put_first;
00085    jb_put_impl put;
00086    jb_get_impl get;
00087    jb_next_impl next;
00088    jb_remove_impl remove;
00089    jb_force_resynch_impl force_resync;
00090    jb_empty_and_reset_impl empty_and_reset;
00091 };
00092 
00093 /* Implementation functions */
00094 /* fixed */
00095 static void * jb_create_fixed(struct ast_jb_conf *general_config, long resynch_threshold);
00096 static void jb_destroy_fixed(void *jb);
00097 static int jb_put_first_fixed(void *jb, struct ast_frame *fin, long now);
00098 static int jb_put_fixed(void *jb, struct ast_frame *fin, long now);
00099 static int jb_get_fixed(void *jb, struct ast_frame **fout, long now, long interpl);
00100 static long jb_next_fixed(void *jb);
00101 static int jb_remove_fixed(void *jb, struct ast_frame **fout);
00102 static void jb_force_resynch_fixed(void *jb);
00103 static void jb_empty_and_reset_fixed(void *jb);
00104 /* adaptive */
00105 static void * jb_create_adaptive(struct ast_jb_conf *general_config, long resynch_threshold);
00106 static void jb_destroy_adaptive(void *jb);
00107 static int jb_put_first_adaptive(void *jb, struct ast_frame *fin, long now);
00108 static int jb_put_adaptive(void *jb, struct ast_frame *fin, long now);
00109 static int jb_get_adaptive(void *jb, struct ast_frame **fout, long now, long interpl);
00110 static long jb_next_adaptive(void *jb);
00111 static int jb_remove_adaptive(void *jb, struct ast_frame **fout);
00112 static void jb_force_resynch_adaptive(void *jb);
00113 static void jb_empty_and_reset_adaptive(void *jb);
00114 
00115 /* Available jb implementations */
00116 static struct ast_jb_impl avail_impl[] = 
00117 {
00118    {
00119       .name = "fixed",
00120       .create = jb_create_fixed,
00121       .destroy = jb_destroy_fixed,
00122       .put_first = jb_put_first_fixed,
00123       .put = jb_put_fixed,
00124       .get = jb_get_fixed,
00125       .next = jb_next_fixed,
00126       .remove = jb_remove_fixed,
00127       .force_resync = jb_force_resynch_fixed,
00128       .empty_and_reset = jb_empty_and_reset_fixed,
00129    },
00130    {
00131       .name = "adaptive",
00132       .create = jb_create_adaptive,
00133       .destroy = jb_destroy_adaptive,
00134       .put_first = jb_put_first_adaptive,
00135       .put = jb_put_adaptive,
00136       .get = jb_get_adaptive,
00137       .next = jb_next_adaptive,
00138       .remove = jb_remove_adaptive,
00139       .force_resync = jb_force_resynch_adaptive,
00140       .empty_and_reset = jb_empty_and_reset_adaptive,
00141    }
00142 };
00143 
00144 static int default_impl = 0;
00145 
00146 
00147 /*! Abstract return codes */
00148 enum {
00149    JB_IMPL_OK,
00150    JB_IMPL_DROP,
00151    JB_IMPL_INTERP,
00152    JB_IMPL_NOFRAME
00153 };
00154 
00155 /* Translations between impl and abstract return codes */
00156 static int fixed_to_abstract_code[] =
00157    {JB_IMPL_OK, JB_IMPL_DROP, JB_IMPL_INTERP, JB_IMPL_NOFRAME};
00158 static int adaptive_to_abstract_code[] =
00159    {JB_IMPL_OK, JB_IMPL_NOFRAME, JB_IMPL_NOFRAME, JB_IMPL_INTERP, JB_IMPL_DROP, JB_IMPL_OK};
00160 
00161 /* JB_GET actions (used only for the frames log) */
00162 static char *jb_get_actions[] = {"Delivered", "Dropped", "Interpolated", "No"};
00163 
00164 /*! \brief Macros for the frame log files */
00165 #define jb_framelog(...) do { \
00166    if (jb->logfile) { \
00167       fprintf(jb->logfile, __VA_ARGS__); \
00168       fflush(jb->logfile); \
00169    } \
00170 } while (0)
00171 
00172 
00173 /* Internal utility functions */
00174 static void jb_choose_impl(struct ast_channel *chan);
00175 static void jb_get_and_deliver(struct ast_channel *chan);
00176 static int create_jb(struct ast_channel *chan, struct ast_frame *first_frame);
00177 static long get_now(struct ast_jb *jb, struct timeval *tv);
00178 
00179 
00180 /* Interface ast jb functions impl */
00181 
00182 
00183 static void jb_choose_impl(struct ast_channel *chan)
00184 {
00185    struct ast_jb *jb = &chan->jb;
00186    struct ast_jb_conf *jbconf = &jb->conf;
00187    struct ast_jb_impl *test_impl;
00188    int i, avail_impl_count = sizeof(avail_impl) / sizeof(avail_impl[0]);
00189    
00190    jb->impl = &avail_impl[default_impl];
00191    
00192    if (ast_strlen_zero(jbconf->impl))
00193       return;
00194       
00195    for (i = 0; i < avail_impl_count; i++) {
00196       test_impl = &avail_impl[i];
00197       if (!strcasecmp(jbconf->impl, test_impl->name)) {
00198          jb->impl = test_impl;
00199          return;
00200       }
00201    }
00202 }
00203 
00204 int ast_jb_do_usecheck(struct ast_channel *c0, struct ast_channel *c1)
00205 {
00206    struct ast_jb *jb0 = &c0->jb;
00207    struct ast_jb *jb1 = &c1->jb;
00208    struct ast_jb_conf *conf0 = &jb0->conf;
00209    struct ast_jb_conf *conf1 = &jb1->conf;
00210    int c0_wants_jitter = c0->tech->properties & AST_CHAN_TP_WANTSJITTER;
00211    int c0_creates_jitter = c0->tech->properties & AST_CHAN_TP_CREATESJITTER;
00212    int c0_jb_enabled = ast_test_flag(conf0, AST_JB_ENABLED);
00213    int c0_force_jb = ast_test_flag(conf0, AST_JB_FORCED);
00214    int c0_jb_timebase_initialized = ast_test_flag(jb0, JB_TIMEBASE_INITIALIZED);
00215    int c0_jb_created = ast_test_flag(jb0, JB_CREATED);
00216    int c1_wants_jitter = c1->tech->properties & AST_CHAN_TP_WANTSJITTER;
00217    int c1_creates_jitter = c1->tech->properties & AST_CHAN_TP_CREATESJITTER;
00218    int c1_jb_enabled = ast_test_flag(conf1, AST_JB_ENABLED);
00219    int c1_force_jb = ast_test_flag(conf1, AST_JB_FORCED);
00220    int c1_jb_timebase_initialized = ast_test_flag(jb1, JB_TIMEBASE_INITIALIZED);
00221    int c1_jb_created = ast_test_flag(jb1, JB_CREATED);
00222    int inuse = 0;
00223 
00224    /* Determine whether audio going to c0 needs a jitter buffer */
00225    if (((!c0_wants_jitter && c1_creates_jitter) || (c0_force_jb && c1_creates_jitter)) && c0_jb_enabled) {
00226       ast_set_flag(jb0, JB_USE);
00227       if (!c0_jb_timebase_initialized) {
00228          if (c1_jb_timebase_initialized) {
00229             memcpy(&jb0->timebase, &jb1->timebase, sizeof(struct timeval));
00230          } else {
00231             gettimeofday(&jb0->timebase, NULL);
00232          }
00233          ast_set_flag(jb0, JB_TIMEBASE_INITIALIZED);
00234       }
00235    
00236       if (!c0_jb_created) {
00237          jb_choose_impl(c0);
00238       }
00239 
00240       inuse = 1;
00241    }
00242    
00243    /* Determine whether audio going to c1 needs a jitter buffer */
00244    if (((!c1_wants_jitter && c0_creates_jitter) || (c1_force_jb && c0_creates_jitter)) && c1_jb_enabled) {
00245       ast_set_flag(jb1, JB_USE);
00246       if (!c1_jb_timebase_initialized) {
00247          if (c0_jb_timebase_initialized) {
00248             memcpy(&jb1->timebase, &jb0->timebase, sizeof(struct timeval));
00249          } else {
00250             gettimeofday(&jb1->timebase, NULL);
00251          }
00252          ast_set_flag(jb1, JB_TIMEBASE_INITIALIZED);
00253       }
00254       
00255       if (!c1_jb_created) {
00256          jb_choose_impl(c1);
00257       }
00258 
00259       inuse = 1;
00260    }
00261 
00262    return inuse;
00263 }
00264 
00265 int ast_jb_get_when_to_wakeup(struct ast_channel *c0, struct ast_channel *c1, int time_left)
00266 {
00267    struct ast_jb *jb0 = &c0->jb;
00268    struct ast_jb *jb1 = &c1->jb;
00269    int c0_use_jb = ast_test_flag(jb0, JB_USE);
00270    int c0_jb_is_created = ast_test_flag(jb0, JB_CREATED);
00271    int c1_use_jb = ast_test_flag(jb1, JB_USE);
00272    int c1_jb_is_created = ast_test_flag(jb1, JB_CREATED);
00273    int wait, wait0, wait1;
00274    struct timeval tv_now;
00275    
00276    if (time_left == 0) {
00277       /* No time left - the bridge will be retried */
00278       /* TODO: Test disable this */
00279       /*return 0;*/
00280    }
00281    
00282    if (time_left < 0) {
00283       time_left = INT_MAX;
00284    }
00285    
00286    gettimeofday(&tv_now, NULL);
00287    
00288    wait0 = (c0_use_jb && c0_jb_is_created) ? jb0->next - get_now(jb0, &tv_now) : time_left;
00289    wait1 = (c1_use_jb && c1_jb_is_created) ? jb1->next - get_now(jb1, &tv_now) : time_left;
00290    
00291    wait = wait0 < wait1 ? wait0 : wait1;
00292    wait = wait < time_left ? wait : time_left;
00293    
00294    if (wait == INT_MAX) {
00295       wait = -1;
00296    } else if (wait < 1) {
00297       /* don't let wait=0, because this can cause the pbx thread to loop without any sleeping at all */
00298       wait = 1;
00299    }
00300    
00301    return wait;
00302 }
00303 
00304 
00305 int ast_jb_put(struct ast_channel *chan, struct ast_frame *f)
00306 {
00307    struct ast_jb *jb = &chan->jb;
00308    struct ast_jb_impl *jbimpl = jb->impl;
00309    void *jbobj = jb->jbobj;
00310    struct ast_frame *frr;
00311    long now = 0;
00312    
00313    if (!ast_test_flag(jb, JB_USE))
00314       return -1;
00315 
00316    if (f->frametype != AST_FRAME_VOICE) {
00317       if (f->frametype == AST_FRAME_DTMF && ast_test_flag(jb, JB_CREATED)) {
00318          jb_framelog("JB_PUT {now=%ld}: Received DTMF frame. Force resynching jb...\n", now);
00319          jbimpl->force_resync(jbobj);
00320       }
00321       
00322       return -1;
00323    }
00324 
00325    /* We consider an enabled jitterbuffer should receive frames with valid timing info. */
00326    if (!ast_test_flag(f, AST_FRFLAG_HAS_TIMING_INFO) || f->len < 2 || f->ts < 0) {
00327       ast_log(LOG_WARNING, "%s recieved frame with invalid timing info: "
00328          "has_timing_info=%d, len=%ld, ts=%ld, src=%s\n",
00329          chan->name, ast_test_flag(f, AST_FRFLAG_HAS_TIMING_INFO), f->len, f->ts, f->src);
00330       return -1;
00331    }
00332 
00333    frr = ast_frdup(f);
00334 
00335    if (!frr) {
00336       ast_log(LOG_ERROR, "Failed to isolate frame for the jitterbuffer on channel '%s'\n", chan->name);
00337       return -1;
00338    }
00339 
00340    if (!ast_test_flag(jb, JB_CREATED)) {
00341       if (create_jb(chan, frr)) {
00342          ast_frfree(frr);
00343          /* Disable the jitterbuffer */
00344          ast_clear_flag(jb, JB_USE);
00345          return -1;
00346       }
00347 
00348       ast_set_flag(jb, JB_CREATED);
00349       return 0;
00350    } else {
00351       now = get_now(jb, NULL);
00352       if (jbimpl->put(jbobj, frr, now) != JB_IMPL_OK) {
00353          jb_framelog("JB_PUT {now=%ld}: Dropped frame with ts=%ld and len=%ld\n", now, frr->ts, frr->len);
00354          ast_frfree(frr);
00355          /*return -1;*/
00356          /* TODO: Check this fix - should return 0 here, because the dropped frame shouldn't 
00357             be delivered at all */
00358          return 0;
00359       }
00360 
00361       jb->next = jbimpl->next(jbobj);
00362 
00363       jb_framelog("JB_PUT {now=%ld}: Queued frame with ts=%ld and len=%ld\n", now, frr->ts, frr->len);
00364 
00365       return 0;
00366    }
00367 }
00368 
00369 
00370 void ast_jb_get_and_deliver(struct ast_channel *c0, struct ast_channel *c1)
00371 {
00372    struct ast_jb *jb0 = &c0->jb;
00373    struct ast_jb *jb1 = &c1->jb;
00374    int c0_use_jb = ast_test_flag(jb0, JB_USE);
00375    int c0_jb_is_created = ast_test_flag(jb0, JB_CREATED);
00376    int c1_use_jb = ast_test_flag(jb1, JB_USE);
00377    int c1_jb_is_created = ast_test_flag(jb1, JB_CREATED);
00378    
00379    if (c0_use_jb && c0_jb_is_created)
00380       jb_get_and_deliver(c0);
00381    
00382    if (c1_use_jb && c1_jb_is_created)
00383       jb_get_and_deliver(c1);
00384 }
00385 
00386 
00387 static void jb_get_and_deliver(struct ast_channel *chan)
00388 {
00389    struct ast_jb *jb = &chan->jb;
00390    struct ast_jb_impl *jbimpl = jb->impl;
00391    void *jbobj = jb->jbobj;
00392    struct ast_frame *f, finterp;
00393    long now;
00394    int interpolation_len, res;
00395    
00396    now = get_now(jb, NULL);
00397    jb->next = jbimpl->next(jbobj);
00398    if (now < jb->next) {
00399       jb_framelog("\tJB_GET {now=%ld}: now < next=%ld\n", now, jb->next);
00400       return;
00401    }
00402    
00403    while (now >= jb->next) {
00404       interpolation_len = ast_codec_interp_len(jb->last_format);
00405       
00406       res = jbimpl->get(jbobj, &f, now, interpolation_len);
00407       
00408       switch(res) {
00409       case JB_IMPL_OK:
00410          /* deliver the frame */
00411          ast_write(chan, f);
00412       case JB_IMPL_DROP:
00413          jb_framelog("\tJB_GET {now=%ld}: %s frame with ts=%ld and len=%ld\n",
00414             now, jb_get_actions[res], f->ts, f->len);
00415          jb->last_format = f->subclass;
00416          ast_frfree(f);
00417          break;
00418       case JB_IMPL_INTERP:
00419          /* interpolate a frame */
00420          f = &finterp;
00421          f->frametype = AST_FRAME_VOICE;
00422          f->subclass = jb->last_format;
00423          f->datalen  = 0;
00424          f->samples  = interpolation_len * 8;
00425          f->mallocd  = 0;
00426          f->src  = "JB interpolation";
00427          f->data  = NULL;
00428          f->delivery = ast_tvadd(jb->timebase, ast_samp2tv(jb->next, 1000));
00429          f->offset = AST_FRIENDLY_OFFSET;
00430          /* deliver the interpolated frame */
00431          ast_write(chan, f);
00432          jb_framelog("\tJB_GET {now=%ld}: Interpolated frame with len=%d\n", now, interpolation_len);
00433          break;
00434       case JB_IMPL_NOFRAME:
00435          ast_log(LOG_WARNING,
00436             "JB_IMPL_NOFRAME is retuned from the %s jb when now=%ld >= next=%ld, jbnext=%ld!\n",
00437             jbimpl->name, now, jb->next, jbimpl->next(jbobj));
00438          jb_framelog("\tJB_GET {now=%ld}: No frame for now!?\n", now);
00439          return;
00440       default:
00441          ast_log(LOG_ERROR, "This should never happen!\n");
00442          ast_assert("JB type unknown" == NULL);
00443          break;
00444       }
00445       
00446       jb->next = jbimpl->next(jbobj);
00447    }
00448 }
00449 
00450 
00451 static int create_jb(struct ast_channel *chan, struct ast_frame *frr)
00452 {
00453    struct ast_jb *jb = &chan->jb;
00454    struct ast_jb_conf *jbconf = &jb->conf;
00455    struct ast_jb_impl *jbimpl = jb->impl;
00456    void *jbobj;
00457    struct ast_channel *bridged;
00458    long now;
00459    char logfile_pathname[20 + AST_JB_IMPL_NAME_SIZE + 2*AST_CHANNEL_NAME + 1];
00460    char name1[AST_CHANNEL_NAME], name2[AST_CHANNEL_NAME], *tmp;
00461    int res;
00462 
00463    jbobj = jb->jbobj = jbimpl->create(jbconf, jbconf->resync_threshold);
00464    if (!jbobj) {
00465       ast_log(LOG_WARNING, "Failed to create jitterbuffer on channel '%s'\n", chan->name);
00466       return -1;
00467    }
00468    
00469    now = get_now(jb, NULL);
00470    res = jbimpl->put_first(jbobj, frr, now);
00471    
00472    /* The result of putting the first frame should not differ from OK. However, its possible
00473       some implementations (i.e. adaptive's when resynch_threshold is specified) to drop it. */
00474    if (res != JB_IMPL_OK) {
00475       ast_log(LOG_WARNING, "Failed to put first frame in the jitterbuffer on channel '%s'\n", chan->name);
00476       /*
00477       jbimpl->destroy(jbobj);
00478       return -1;
00479       */
00480    }
00481    
00482    /* Init next */
00483    jb->next = jbimpl->next(jbobj);
00484    
00485    /* Init last format for a first time. */
00486    jb->last_format = frr->subclass;
00487    
00488    /* Create a frame log file */
00489    if (ast_test_flag(jbconf, AST_JB_LOG)) {
00490       snprintf(name2, sizeof(name2), "%s", chan->name);
00491       tmp = strchr(name2, '/');
00492       if (tmp)
00493          *tmp = '#';
00494       
00495       bridged = ast_bridged_channel(chan);
00496       /* We should always have bridged chan if a jitterbuffer is in use */
00497       ast_assert(bridged != NULL);
00498 
00499       snprintf(name1, sizeof(name1), "%s", bridged->name);
00500       tmp = strchr(name1, '/');
00501       if (tmp)
00502          *tmp = '#';
00503       
00504       snprintf(logfile_pathname, sizeof(logfile_pathname),
00505          "/tmp/ast_%s_jb_%s--%s.log", jbimpl->name, name1, name2);
00506       jb->logfile = fopen(logfile_pathname, "w+b");
00507       
00508       if (!jb->logfile)
00509          ast_log(LOG_WARNING, "Failed to create frame log file with pathname '%s'\n", logfile_pathname);
00510       
00511       if (res == JB_IMPL_OK)
00512          jb_framelog("JB_PUT_FIRST {now=%ld}: Queued frame with ts=%ld and len=%ld\n",
00513             now, frr->ts, frr->len);
00514       else
00515          jb_framelog("JB_PUT_FIRST {now=%ld}: Dropped frame with ts=%ld and len=%ld\n",
00516             now, frr->ts, frr->len);
00517    }
00518 
00519    if (option_verbose > 2) 
00520       ast_verbose(VERBOSE_PREFIX_3 "%s jitterbuffer created on channel %s\n", jbimpl->name, chan->name);
00521    
00522    /* Free the frame if it has not been queued in the jb */
00523    if (res != JB_IMPL_OK)
00524       ast_frfree(frr);
00525    
00526    return 0;
00527 }
00528 
00529 
00530 void ast_jb_destroy(struct ast_channel *chan)
00531 {
00532    struct ast_jb *jb = &chan->jb;
00533    struct ast_jb_impl *jbimpl = jb->impl;
00534    void *jbobj = jb->jbobj;
00535    struct ast_frame *f;
00536 
00537    if (jb->logfile) {
00538       fclose(jb->logfile);
00539       jb->logfile = NULL;
00540    }
00541    
00542    if (ast_test_flag(jb, JB_CREATED)) {
00543       /* Remove and free all frames still queued in jb */
00544       while (jbimpl->remove(jbobj, &f) == JB_IMPL_OK) {
00545          ast_frfree(f);
00546       }
00547       
00548       jbimpl->destroy(jbobj);
00549       jb->jbobj = NULL;
00550       
00551       ast_clear_flag(jb, JB_CREATED);
00552 
00553       if (option_verbose > 2)
00554          ast_verbose(VERBOSE_PREFIX_3 "%s jitterbuffer destroyed on channel %s\n", jbimpl->name, chan->name);
00555    }
00556 }
00557 
00558 
00559 static long get_now(struct ast_jb *jb, struct timeval *tv)
00560 {
00561    struct timeval now;
00562 
00563    if (!tv) {
00564       tv = &now;
00565       gettimeofday(tv, NULL);
00566    }
00567 
00568    return ast_tvdiff_ms(*tv, jb->timebase);
00569 }
00570 
00571 
00572 int ast_jb_read_conf(struct ast_jb_conf *conf, char *varname, char *value)
00573 {
00574    int prefixlen = sizeof(AST_JB_CONF_PREFIX) - 1;
00575    char *name;
00576    int tmp;
00577    
00578    if (strncasecmp(AST_JB_CONF_PREFIX, varname, prefixlen))
00579       return -1;
00580    
00581    name = varname + prefixlen;
00582    
00583    if (!strcasecmp(name, AST_JB_CONF_ENABLE)) {
00584       ast_set2_flag(conf, ast_true(value), AST_JB_ENABLED);
00585    } else if (!strcasecmp(name, AST_JB_CONF_FORCE)) {
00586       ast_set2_flag(conf, ast_true(value), AST_JB_FORCED);
00587    } else if (!strcasecmp(name, AST_JB_CONF_MAX_SIZE)) {
00588       if ((tmp = atoi(value)) > 0)
00589          conf->max_size = tmp;
00590    } else if (!strcasecmp(name, AST_JB_CONF_RESYNCH_THRESHOLD)) {
00591       if ((tmp = atoi(value)) > 0)
00592          conf->resync_threshold = tmp;
00593    } else if (!strcasecmp(name, AST_JB_CONF_IMPL)) {
00594       if (!ast_strlen_zero(value))
00595          snprintf(conf->impl, sizeof(conf->impl), "%s", value);
00596    } else if (!strcasecmp(name, AST_JB_CONF_LOG)) {
00597       ast_set2_flag(conf, ast_true(value), AST_JB_LOG);
00598    } else {
00599       return -1;
00600    }
00601    
00602    return 0;
00603 }
00604 
00605 
00606 void ast_jb_configure(struct ast_channel *chan, const struct ast_jb_conf *conf)
00607 {
00608    memcpy(&chan->jb.conf, conf, sizeof(*conf));
00609 }
00610 
00611 
00612 void ast_jb_get_config(const struct ast_channel *chan, struct ast_jb_conf *conf)
00613 {
00614    memcpy(conf, &chan->jb.conf, sizeof(*conf));
00615 }
00616 
00617 void ast_jb_empty_and_reset(struct ast_channel *c0, struct ast_channel *c1)
00618 {
00619    struct ast_jb *jb0 = &c0->jb;
00620    struct ast_jb *jb1 = &c1->jb;
00621    int c0_use_jb = ast_test_flag(jb0, JB_USE);
00622    int c0_jb_is_created = ast_test_flag(jb0, JB_CREATED);
00623    int c1_use_jb = ast_test_flag(jb1, JB_USE);
00624    int c1_jb_is_created = ast_test_flag(jb1, JB_CREATED);
00625 
00626    if (c0_use_jb && c0_jb_is_created && jb0->impl->empty_and_reset) {
00627       jb0->impl->empty_and_reset(jb0->jbobj);
00628    }
00629 
00630    if (c1_use_jb && c1_jb_is_created && jb1->impl->empty_and_reset) {
00631       jb1->impl->empty_and_reset(jb1->jbobj);
00632    }
00633 }
00634 
00635 /* Implementation functions */
00636 
00637 /* fixed */
00638 static void * jb_create_fixed(struct ast_jb_conf *general_config, long resynch_threshold)
00639 {
00640    struct fixed_jb_conf conf;
00641 
00642    conf.jbsize = general_config->max_size;
00643    conf.resync_threshold = resynch_threshold;
00644 
00645    return fixed_jb_new(&conf);
00646 }
00647 
00648 static void jb_destroy_fixed(void *jb)
00649 {
00650    struct fixed_jb *fixedjb = (struct fixed_jb *) jb;
00651    
00652    /* destroy the jb */
00653    fixed_jb_destroy(fixedjb);
00654 }
00655 
00656 
00657 static int jb_put_first_fixed(void *jb, struct ast_frame *fin, long now)
00658 {
00659    struct fixed_jb *fixedjb = (struct fixed_jb *) jb;
00660    int res;
00661    
00662    res = fixed_jb_put_first(fixedjb, fin, fin->len, fin->ts, now);
00663    
00664    return fixed_to_abstract_code[res];
00665 }
00666 
00667 
00668 static int jb_put_fixed(void *jb, struct ast_frame *fin, long now)
00669 {
00670    struct fixed_jb *fixedjb = (struct fixed_jb *) jb;
00671    int res;
00672    
00673    res = fixed_jb_put(fixedjb, fin, fin->len, fin->ts, now);
00674    
00675    return fixed_to_abstract_code[res];
00676 }
00677 
00678 
00679 static int jb_get_fixed(void *jb, struct ast_frame **fout, long now, long interpl)
00680 {
00681    struct fixed_jb *fixedjb = (struct fixed_jb *) jb;
00682    struct fixed_jb_frame frame;
00683    int res;
00684    
00685    res = fixed_jb_get(fixedjb, &frame, now, interpl);
00686    *fout = frame.data;
00687    
00688    return fixed_to_abstract_code[res];
00689 }
00690 
00691 
00692 static long jb_next_fixed(void *jb)
00693 {
00694    struct fixed_jb *fixedjb = (struct fixed_jb *) jb;
00695    
00696    return fixed_jb_next(fixedjb);
00697 }
00698 
00699 
00700 static int jb_remove_fixed(void *jb, struct ast_frame **fout)
00701 {
00702    struct fixed_jb *fixedjb = (struct fixed_jb *) jb;
00703    struct fixed_jb_frame frame;
00704    int res;
00705    
00706    res = fixed_jb_remove(fixedjb, &frame);
00707    *fout = frame.data;
00708    
00709    return fixed_to_abstract_code[res];
00710 }
00711 
00712 
00713 static void jb_force_resynch_fixed(void *jb)
00714 {
00715    struct fixed_jb *fixedjb = (struct fixed_jb *) jb;
00716    
00717    fixed_jb_set_force_resynch(fixedjb);
00718 }
00719 
00720 static void jb_empty_and_reset_fixed(void *jb)
00721 {
00722    struct fixed_jb *fixedjb = jb;
00723    struct fixed_jb_frame f;
00724 
00725    while (fixed_jb_remove(fixedjb, &f) == FIXED_JB_OK) {
00726       ast_frfree(f.data);
00727    }
00728 }
00729 
00730 /* adaptive */
00731 
00732 static void *jb_create_adaptive(struct ast_jb_conf *general_config, long resynch_threshold)
00733 {
00734    jb_conf jbconf;
00735    jitterbuf *adaptivejb;
00736 
00737    adaptivejb = jb_new();
00738    if (adaptivejb) {
00739       jbconf.max_jitterbuf = general_config->max_size;
00740       jbconf.resync_threshold = general_config->resync_threshold;
00741       jbconf.max_contig_interp = 10;
00742       jb_setconf(adaptivejb, &jbconf);
00743    }
00744    
00745    return adaptivejb;
00746 }
00747 
00748 
00749 static void jb_destroy_adaptive(void *jb)
00750 {
00751    jitterbuf *adaptivejb = (jitterbuf *) jb;
00752    
00753    jb_destroy(adaptivejb);
00754 }
00755 
00756 
00757 static int jb_put_first_adaptive(void *jb, struct ast_frame *fin, long now)
00758 {
00759    return jb_put_adaptive(jb, fin, now);
00760 }
00761 
00762 
00763 static int jb_put_adaptive(void *jb, struct ast_frame *fin, long now)
00764 {
00765    jitterbuf *adaptivejb = (jitterbuf *) jb;
00766    int res;
00767    
00768    res = jb_put(adaptivejb, fin, JB_TYPE_VOICE, fin->len, fin->ts, now);
00769    
00770    return adaptive_to_abstract_code[res];
00771 }
00772 
00773 
00774 static int jb_get_adaptive(void *jb, struct ast_frame **fout, long now, long interpl)
00775 {
00776    jitterbuf *adaptivejb = (jitterbuf *) jb;
00777    jb_frame frame;
00778    int res;
00779    
00780    res = jb_get(adaptivejb, &frame, now, interpl);
00781    *fout = frame.data;
00782    
00783    return adaptive_to_abstract_code[res];
00784 }
00785 
00786 
00787 static long jb_next_adaptive(void *jb)
00788 {
00789    jitterbuf *adaptivejb = (jitterbuf *) jb;
00790    
00791    return jb_next(adaptivejb);
00792 }
00793 
00794 
00795 static int jb_remove_adaptive(void *jb, struct ast_frame **fout)
00796 {
00797    jitterbuf *adaptivejb = (jitterbuf *) jb;
00798    jb_frame frame;
00799    int res;
00800    
00801    res = jb_getall(adaptivejb, &frame);
00802    *fout = frame.data;
00803    
00804    return adaptive_to_abstract_code[res];
00805 }
00806 
00807 
00808 static void jb_force_resynch_adaptive(void *jb)
00809 {
00810 }
00811 
00812 static void jb_empty_and_reset_adaptive(void *jb)
00813 {
00814    jitterbuf *adaptivejb = jb;
00815    jb_frame f;
00816 
00817    while (jb_getall(adaptivejb, &f) == JB_OK) {
00818       ast_frfree(f.data);
00819    }
00820 
00821    jb_reset(adaptivejb);
00822 }

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