Wed Aug 18 22:33:40 2010

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  */
00031 
00032 #include "asterisk.h"
00033 
00034 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 249896 $")
00035 
00036 #include "asterisk/frame.h"
00037 #include "asterisk/channel.h"
00038 #include "asterisk/term.h"
00039 #include "asterisk/utils.h"
00040 
00041 #include "asterisk/abstract_jb.h"
00042 #include "fixedjitterbuf.h"
00043 #include "jitterbuf.h"
00044 
00045 /*! Internal jb flags */
00046 enum {
00047    JB_USE =                  (1 << 0),
00048    JB_TIMEBASE_INITIALIZED = (1 << 1),
00049    JB_CREATED =              (1 << 2)
00050 };
00051 
00052 /* Hooks for the abstract jb implementation */
00053 
00054 /*! \brief Create */
00055 typedef void * (*jb_create_impl)(struct ast_jb_conf *general_config, long resynch_threshold);
00056 /*! \brief Destroy */
00057 typedef void (*jb_destroy_impl)(void *jb);
00058 /*! \brief Put first frame */
00059 typedef int (*jb_put_first_impl)(void *jb, struct ast_frame *fin, long now);
00060 /*! \brief Put frame */
00061 typedef int (*jb_put_impl)(void *jb, struct ast_frame *fin, long now);
00062 /*! \brief Get frame for now */
00063 typedef int (*jb_get_impl)(void *jb, struct ast_frame **fout, long now, long interpl);
00064 /*! \brief Get next */
00065 typedef long (*jb_next_impl)(void *jb);
00066 /*! \brief Remove first frame */
00067 typedef int (*jb_remove_impl)(void *jb, struct ast_frame **fout);
00068 /*! \brief Force resynch */
00069 typedef void (*jb_force_resynch_impl)(void *jb);
00070 /*! \brief Empty and reset jb */
00071 typedef void (*jb_empty_and_reset_impl)(void *jb);
00072 
00073 /*!
00074  * \brief Jitterbuffer implementation private struct.
00075  */
00076 struct ast_jb_impl
00077 {
00078    char name[AST_JB_IMPL_NAME_SIZE];
00079    jb_create_impl create;
00080    jb_destroy_impl destroy;
00081    jb_put_first_impl put_first;
00082    jb_put_impl put;
00083    jb_get_impl get;
00084    jb_next_impl next;
00085    jb_remove_impl remove;
00086    jb_force_resynch_impl force_resync;
00087    jb_empty_and_reset_impl empty_and_reset;
00088 };
00089 
00090 /* Implementation functions */
00091 /* fixed */
00092 static void *jb_create_fixed(struct ast_jb_conf *general_config, long resynch_threshold);
00093 static void jb_destroy_fixed(void *jb);
00094 static int jb_put_first_fixed(void *jb, struct ast_frame *fin, long now);
00095 static int jb_put_fixed(void *jb, struct ast_frame *fin, long now);
00096 static int jb_get_fixed(void *jb, struct ast_frame **fout, long now, long interpl);
00097 static long jb_next_fixed(void *jb);
00098 static int jb_remove_fixed(void *jb, struct ast_frame **fout);
00099 static void jb_force_resynch_fixed(void *jb);
00100 static void jb_empty_and_reset_fixed(void *jb);
00101 /* adaptive */
00102 static void * jb_create_adaptive(struct ast_jb_conf *general_config, long resynch_threshold);
00103 static void jb_destroy_adaptive(void *jb);
00104 static int jb_put_first_adaptive(void *jb, struct ast_frame *fin, long now);
00105 static int jb_put_adaptive(void *jb, struct ast_frame *fin, long now);
00106 static int jb_get_adaptive(void *jb, struct ast_frame **fout, long now, long interpl);
00107 static long jb_next_adaptive(void *jb);
00108 static int jb_remove_adaptive(void *jb, struct ast_frame **fout);
00109 static void jb_force_resynch_adaptive(void *jb);
00110 static void jb_empty_and_reset_adaptive(void *jb);
00111 
00112 /* Available jb implementations */
00113 static struct ast_jb_impl avail_impl[] = 
00114 {
00115    {
00116       .name = "fixed",
00117       .create = jb_create_fixed,
00118       .destroy = jb_destroy_fixed,
00119       .put_first = jb_put_first_fixed,
00120       .put = jb_put_fixed,
00121       .get = jb_get_fixed,
00122       .next = jb_next_fixed,
00123       .remove = jb_remove_fixed,
00124       .force_resync = jb_force_resynch_fixed,
00125       .empty_and_reset = jb_empty_and_reset_fixed,
00126    },
00127    {
00128       .name = "adaptive",
00129       .create = jb_create_adaptive,
00130       .destroy = jb_destroy_adaptive,
00131       .put_first = jb_put_first_adaptive,
00132       .put = jb_put_adaptive,
00133       .get = jb_get_adaptive,
00134       .next = jb_next_adaptive,
00135       .remove = jb_remove_adaptive,
00136       .force_resync = jb_force_resynch_adaptive,
00137       .empty_and_reset = jb_empty_and_reset_adaptive,
00138    }
00139 };
00140 
00141 static int default_impl = 0;
00142 
00143 
00144 /*! Abstract return codes */
00145 enum {
00146    JB_IMPL_OK,
00147    JB_IMPL_DROP,
00148    JB_IMPL_INTERP,
00149    JB_IMPL_NOFRAME
00150 };
00151 
00152 /* Translations between impl and abstract return codes */
00153 static int fixed_to_abstract_code[] =
00154    {JB_IMPL_OK, JB_IMPL_DROP, JB_IMPL_INTERP, JB_IMPL_NOFRAME};
00155 static int adaptive_to_abstract_code[] =
00156    {JB_IMPL_OK, JB_IMPL_NOFRAME, JB_IMPL_NOFRAME, JB_IMPL_INTERP, JB_IMPL_DROP, JB_IMPL_OK};
00157 
00158 /* JB_GET actions (used only for the frames log) */
00159 static char *jb_get_actions[] = {"Delivered", "Dropped", "Interpolated", "No"};
00160 
00161 /*! \brief Macros for the frame log files */
00162 #define jb_framelog(...) do { \
00163    if (jb->logfile) { \
00164       fprintf(jb->logfile, __VA_ARGS__); \
00165       fflush(jb->logfile); \
00166    } \
00167 } while (0)
00168 
00169 
00170 /* Internal utility functions */
00171 static void jb_choose_impl(struct ast_channel *chan);
00172 static void jb_get_and_deliver(struct ast_channel *chan);
00173 static int create_jb(struct ast_channel *chan, struct ast_frame *first_frame);
00174 static long get_now(struct ast_jb *jb, struct timeval *tv);
00175 
00176 
00177 /* Interface ast jb functions impl */
00178 
00179 
00180 static void jb_choose_impl(struct ast_channel *chan)
00181 {
00182    struct ast_jb *jb = &chan->jb;
00183    struct ast_jb_conf *jbconf = &jb->conf;
00184    struct ast_jb_impl *test_impl;
00185    int i, avail_impl_count = ARRAY_LEN(avail_impl);
00186    
00187    jb->impl = &avail_impl[default_impl];
00188    
00189    if (ast_strlen_zero(jbconf->impl))
00190       return;
00191       
00192    for (i = 0; i < avail_impl_count; i++) {
00193       test_impl = &avail_impl[i];
00194       if (!strcasecmp(jbconf->impl, test_impl->name)) {
00195          jb->impl = test_impl;
00196          return;
00197       }
00198    }
00199 }
00200 
00201 int ast_jb_do_usecheck(struct ast_channel *c0, struct ast_channel *c1)
00202 {
00203    struct ast_jb *jb0 = &c0->jb;
00204    struct ast_jb *jb1 = &c1->jb;
00205    struct ast_jb_conf *conf0 = &jb0->conf;
00206    struct ast_jb_conf *conf1 = &jb1->conf;
00207    int c0_wants_jitter = c0->tech->properties & AST_CHAN_TP_WANTSJITTER;
00208    int c0_creates_jitter = c0->tech->properties & AST_CHAN_TP_CREATESJITTER;
00209    int c0_jb_enabled = ast_test_flag(conf0, AST_JB_ENABLED);
00210    int c0_force_jb = ast_test_flag(conf0, AST_JB_FORCED);
00211    int c0_jb_timebase_initialized = ast_test_flag(jb0, JB_TIMEBASE_INITIALIZED);
00212    int c0_jb_created = ast_test_flag(jb0, JB_CREATED);
00213    int c1_wants_jitter = c1->tech->properties & AST_CHAN_TP_WANTSJITTER;
00214    int c1_creates_jitter = c1->tech->properties & AST_CHAN_TP_CREATESJITTER;
00215    int c1_jb_enabled = ast_test_flag(conf1, AST_JB_ENABLED);
00216    int c1_force_jb = ast_test_flag(conf1, AST_JB_FORCED);
00217    int c1_jb_timebase_initialized = ast_test_flag(jb1, JB_TIMEBASE_INITIALIZED);
00218    int c1_jb_created = ast_test_flag(jb1, JB_CREATED);
00219    int inuse = 0;
00220 
00221    /* Determine whether audio going to c0 needs a jitter buffer */
00222    if (((!c0_wants_jitter && c1_creates_jitter) || (c0_force_jb && c1_creates_jitter)) && c0_jb_enabled) {
00223       ast_set_flag(jb0, JB_USE);
00224       if (!c0_jb_timebase_initialized) {
00225          if (c1_jb_timebase_initialized) {
00226             memcpy(&jb0->timebase, &jb1->timebase, sizeof(struct timeval));
00227          } else {
00228             gettimeofday(&jb0->timebase, NULL);
00229          }
00230          ast_set_flag(jb0, JB_TIMEBASE_INITIALIZED);
00231       }
00232    
00233       if (!c0_jb_created) {
00234          jb_choose_impl(c0);
00235       }
00236 
00237       inuse = 1;
00238    }
00239    
00240    /* Determine whether audio going to c1 needs a jitter buffer */
00241    if (((!c1_wants_jitter && c0_creates_jitter) || (c1_force_jb && c0_creates_jitter)) && c1_jb_enabled) {
00242       ast_set_flag(jb1, JB_USE);
00243       if (!c1_jb_timebase_initialized) {
00244          if (c0_jb_timebase_initialized) {
00245             memcpy(&jb1->timebase, &jb0->timebase, sizeof(struct timeval));
00246          } else {
00247             gettimeofday(&jb1->timebase, NULL);
00248          }
00249          ast_set_flag(jb1, JB_TIMEBASE_INITIALIZED);
00250       }
00251       
00252       if (!c1_jb_created) {
00253          jb_choose_impl(c1);
00254       }
00255 
00256       inuse = 1;
00257    }
00258 
00259    return inuse;
00260 }
00261 
00262 int ast_jb_get_when_to_wakeup(struct ast_channel *c0, struct ast_channel *c1, int time_left)
00263 {
00264    struct ast_jb *jb0 = &c0->jb;
00265    struct ast_jb *jb1 = &c1->jb;
00266    int c0_use_jb = ast_test_flag(jb0, JB_USE);
00267    int c0_jb_is_created = ast_test_flag(jb0, JB_CREATED);
00268    int c1_use_jb = ast_test_flag(jb1, JB_USE);
00269    int c1_jb_is_created = ast_test_flag(jb1, JB_CREATED);
00270    int wait, wait0, wait1;
00271    struct timeval tv_now;
00272    
00273    if (time_left == 0) {
00274       /* No time left - the bridge will be retried */
00275       /* TODO: Test disable this */
00276       /*return 0;*/
00277    }
00278    
00279    if (time_left < 0) {
00280       time_left = INT_MAX;
00281    }
00282    
00283    gettimeofday(&tv_now, NULL);
00284    
00285    wait0 = (c0_use_jb && c0_jb_is_created) ? jb0->next - get_now(jb0, &tv_now) : time_left;
00286    wait1 = (c1_use_jb && c1_jb_is_created) ? jb1->next - get_now(jb1, &tv_now) : time_left;
00287    
00288    wait = wait0 < wait1 ? wait0 : wait1;
00289    wait = wait < time_left ? wait : time_left;
00290    
00291    if (wait == INT_MAX) {
00292       wait = -1;
00293    } else if (wait < 1) {
00294       /* don't let wait=0, because this can cause the pbx thread to loop without any sleeping at all */
00295       wait = 1;
00296    }
00297    
00298    return wait;
00299 }
00300 
00301 
00302 int ast_jb_put(struct ast_channel *chan, struct ast_frame *f)
00303 {
00304    struct ast_jb *jb = &chan->jb;
00305    struct ast_jb_impl *jbimpl = jb->impl;
00306    void *jbobj = jb->jbobj;
00307    struct ast_frame *frr;
00308    long now = 0;
00309    
00310    if (!ast_test_flag(jb, JB_USE))
00311       return -1;
00312 
00313    if (f->frametype != AST_FRAME_VOICE) {
00314       if (f->frametype == AST_FRAME_DTMF && ast_test_flag(jb, JB_CREATED)) {
00315          jb_framelog("JB_PUT {now=%ld}: Received DTMF frame. Force resynching jb...\n", now);
00316          jbimpl->force_resync(jbobj);
00317       }
00318       
00319       return -1;
00320    }
00321 
00322    /* We consider an enabled jitterbuffer should receive frames with valid timing info. */
00323    if (!ast_test_flag(f, AST_FRFLAG_HAS_TIMING_INFO) || f->len < 2 || f->ts < 0) {
00324       ast_log(LOG_WARNING, "%s received frame with invalid timing info: "
00325          "has_timing_info=%d, len=%ld, ts=%ld, src=%s\n",
00326          chan->name, ast_test_flag(f, AST_FRFLAG_HAS_TIMING_INFO), f->len, f->ts, f->src);
00327       return -1;
00328    }
00329 
00330    frr = ast_frdup(f);
00331 
00332    if (!frr) {
00333       ast_log(LOG_ERROR, "Failed to isolate frame for the jitterbuffer on channel '%s'\n", chan->name);
00334       return -1;
00335    }
00336 
00337    if (!ast_test_flag(jb, JB_CREATED)) {
00338       if (create_jb(chan, frr)) {
00339          ast_frfree(frr);
00340          /* Disable the jitterbuffer */
00341          ast_clear_flag(jb, JB_USE);
00342          return -1;
00343       }
00344 
00345       ast_set_flag(jb, JB_CREATED);
00346       return 0;
00347    } else {
00348       now = get_now(jb, NULL);
00349       if (jbimpl->put(jbobj, frr, now) != JB_IMPL_OK) {
00350          jb_framelog("JB_PUT {now=%ld}: Dropped frame with ts=%ld and len=%ld\n", now, frr->ts, frr->len);
00351          ast_frfree(frr);
00352          /*return -1;*/
00353          /* TODO: Check this fix - should return 0 here, because the dropped frame shouldn't 
00354             be delivered at all */
00355          return 0;
00356       }
00357 
00358       jb->next = jbimpl->next(jbobj);
00359 
00360       jb_framelog("JB_PUT {now=%ld}: Queued frame with ts=%ld and len=%ld\n", now, frr->ts, frr->len);
00361 
00362       return 0;
00363    }
00364 }
00365 
00366 
00367 void ast_jb_get_and_deliver(struct ast_channel *c0, struct ast_channel *c1)
00368 {
00369    struct ast_jb *jb0 = &c0->jb;
00370    struct ast_jb *jb1 = &c1->jb;
00371    int c0_use_jb = ast_test_flag(jb0, JB_USE);
00372    int c0_jb_is_created = ast_test_flag(jb0, JB_CREATED);
00373    int c1_use_jb = ast_test_flag(jb1, JB_USE);
00374    int c1_jb_is_created = ast_test_flag(jb1, JB_CREATED);
00375    
00376    if (c0_use_jb && c0_jb_is_created)
00377       jb_get_and_deliver(c0);
00378    
00379    if (c1_use_jb && c1_jb_is_created)
00380       jb_get_and_deliver(c1);
00381 }
00382 
00383 
00384 static void jb_get_and_deliver(struct ast_channel *chan)
00385 {
00386    struct ast_jb *jb = &chan->jb;
00387    struct ast_jb_impl *jbimpl = jb->impl;
00388    void *jbobj = jb->jbobj;
00389    struct ast_frame *f, finterp = { .frametype = AST_FRAME_VOICE, };
00390    long now;
00391    int interpolation_len, res;
00392    
00393    now = get_now(jb, NULL);
00394    jb->next = jbimpl->next(jbobj);
00395    if (now < jb->next) {
00396       jb_framelog("\tJB_GET {now=%ld}: now < next=%ld\n", now, jb->next);
00397       return;
00398    }
00399    
00400    while (now >= jb->next) {
00401       interpolation_len = ast_codec_interp_len(jb->last_format);
00402       
00403       res = jbimpl->get(jbobj, &f, now, interpolation_len);
00404       
00405       switch (res) {
00406       case JB_IMPL_OK:
00407          /* deliver the frame */
00408          ast_write(chan, f);
00409       case JB_IMPL_DROP:
00410          jb_framelog("\tJB_GET {now=%ld}: %s frame with ts=%ld and len=%ld\n",
00411             now, jb_get_actions[res], f->ts, f->len);
00412          jb->last_format = f->subclass;
00413          ast_frfree(f);
00414          break;
00415       case JB_IMPL_INTERP:
00416          /* interpolate a frame */
00417          f = &finterp;
00418          f->subclass = jb->last_format;
00419          f->samples  = interpolation_len * 8;
00420          f->src  = "JB interpolation";
00421          f->delivery = ast_tvadd(jb->timebase, ast_samp2tv(jb->next, 1000));
00422          f->offset = AST_FRIENDLY_OFFSET;
00423          /* deliver the interpolated frame */
00424          ast_write(chan, f);
00425          jb_framelog("\tJB_GET {now=%ld}: Interpolated frame with len=%d\n", now, interpolation_len);
00426          break;
00427       case JB_IMPL_NOFRAME:
00428          ast_log(LOG_WARNING,
00429             "JB_IMPL_NOFRAME is returned from the %s jb when now=%ld >= next=%ld, jbnext=%ld!\n",
00430             jbimpl->name, now, jb->next, jbimpl->next(jbobj));
00431          jb_framelog("\tJB_GET {now=%ld}: No frame for now!?\n", now);
00432          return;
00433       default:
00434          ast_log(LOG_ERROR, "This should never happen!\n");
00435          ast_assert("JB type unknown" == NULL);
00436          break;
00437       }
00438       
00439       jb->next = jbimpl->next(jbobj);
00440    }
00441 }
00442 
00443 
00444 static int create_jb(struct ast_channel *chan, struct ast_frame *frr)
00445 {
00446    struct ast_jb *jb = &chan->jb;
00447    struct ast_jb_conf *jbconf = &jb->conf;
00448    struct ast_jb_impl *jbimpl = jb->impl;
00449    void *jbobj;
00450    struct ast_channel *bridged;
00451    long now;
00452    char logfile_pathname[20 + AST_JB_IMPL_NAME_SIZE + 2*AST_CHANNEL_NAME + 1];
00453    char name1[AST_CHANNEL_NAME], name2[AST_CHANNEL_NAME], *tmp;
00454    int res;
00455 
00456    jbobj = jb->jbobj = jbimpl->create(jbconf, jbconf->resync_threshold);
00457    if (!jbobj) {
00458       ast_log(LOG_WARNING, "Failed to create jitterbuffer on channel '%s'\n", chan->name);
00459       return -1;
00460    }
00461    
00462    now = get_now(jb, NULL);
00463    res = jbimpl->put_first(jbobj, frr, now);
00464    
00465    /* The result of putting the first frame should not differ from OK. However, its possible
00466       some implementations (i.e. adaptive's when resynch_threshold is specified) to drop it. */
00467    if (res != JB_IMPL_OK) {
00468       ast_log(LOG_WARNING, "Failed to put first frame in the jitterbuffer on channel '%s'\n", chan->name);
00469       /*
00470       jbimpl->destroy(jbobj);
00471       return -1;
00472       */
00473    }
00474    
00475    /* Init next */
00476    jb->next = jbimpl->next(jbobj);
00477    
00478    /* Init last format for a first time. */
00479    jb->last_format = frr->subclass;
00480    
00481    /* Create a frame log file */
00482    if (ast_test_flag(jbconf, AST_JB_LOG)) {
00483       snprintf(name2, sizeof(name2), "%s", chan->name);
00484       tmp = strchr(name2, '/');
00485       if (tmp)
00486          *tmp = '#';
00487       
00488       bridged = ast_bridged_channel(chan);
00489       /* We should always have bridged chan if a jitterbuffer is in use */
00490       ast_assert(bridged != NULL);
00491 
00492       snprintf(name1, sizeof(name1), "%s", bridged->name);
00493       tmp = strchr(name1, '/');
00494       if (tmp)
00495          *tmp = '#';
00496       
00497       snprintf(logfile_pathname, sizeof(logfile_pathname),
00498          "/tmp/ast_%s_jb_%s--%s.log", jbimpl->name, name1, name2);
00499       jb->logfile = fopen(logfile_pathname, "w+b");
00500       
00501       if (!jb->logfile)
00502          ast_log(LOG_ERROR, "Failed to create frame log file with pathname '%s'\n", logfile_pathname);
00503       
00504       if (res == JB_IMPL_OK)
00505          jb_framelog("JB_PUT_FIRST {now=%ld}: Queued frame with ts=%ld and len=%ld\n",
00506             now, frr->ts, frr->len);
00507       else
00508          jb_framelog("JB_PUT_FIRST {now=%ld}: Dropped frame with ts=%ld and len=%ld\n",
00509             now, frr->ts, frr->len);
00510    }
00511 
00512    ast_verb(3, "%s jitterbuffer created on channel %s\n", jbimpl->name, chan->name);
00513    
00514    /* Free the frame if it has not been queued in the jb */
00515    if (res != JB_IMPL_OK)
00516       ast_frfree(frr);
00517    
00518    return 0;
00519 }
00520 
00521 
00522 void ast_jb_destroy(struct ast_channel *chan)
00523 {
00524    struct ast_jb *jb = &chan->jb;
00525    struct ast_jb_impl *jbimpl = jb->impl;
00526    void *jbobj = jb->jbobj;
00527    struct ast_frame *f;
00528 
00529    if (jb->logfile) {
00530       fclose(jb->logfile);
00531       jb->logfile = NULL;
00532    }
00533    
00534    if (ast_test_flag(jb, JB_CREATED)) {
00535       /* Remove and free all frames still queued in jb */
00536       while (jbimpl->remove(jbobj, &f) == JB_IMPL_OK) {
00537          ast_frfree(f);
00538       }
00539       
00540       jbimpl->destroy(jbobj);
00541       jb->jbobj = NULL;
00542       
00543       ast_clear_flag(jb, JB_CREATED);
00544 
00545       ast_verb(3, "%s jitterbuffer destroyed on channel %s\n", jbimpl->name, chan->name);
00546    }
00547 }
00548 
00549 
00550 static long get_now(struct ast_jb *jb, struct timeval *when)
00551 {
00552    struct timeval now;
00553 
00554    if (!when) {
00555       when = &now;
00556       gettimeofday(when, NULL);
00557    }
00558 
00559    return ast_tvdiff_ms(*when, jb->timebase);
00560 }
00561 
00562 
00563 int ast_jb_read_conf(struct ast_jb_conf *conf, const char *varname, const char *value)
00564 {
00565    int prefixlen = sizeof(AST_JB_CONF_PREFIX) - 1;
00566    const char *name;
00567    int tmp;
00568    
00569    if (strncasecmp(AST_JB_CONF_PREFIX, varname, prefixlen))
00570       return -1;
00571    
00572    name = varname + prefixlen;
00573    
00574    if (!strcasecmp(name, AST_JB_CONF_ENABLE)) {
00575       ast_set2_flag(conf, ast_true(value), AST_JB_ENABLED);
00576    } else if (!strcasecmp(name, AST_JB_CONF_FORCE)) {
00577       ast_set2_flag(conf, ast_true(value), AST_JB_FORCED);
00578    } else if (!strcasecmp(name, AST_JB_CONF_MAX_SIZE)) {
00579       if ((tmp = atoi(value)) > 0)
00580          conf->max_size = tmp;
00581    } else if (!strcasecmp(name, AST_JB_CONF_RESYNCH_THRESHOLD)) {
00582       if ((tmp = atoi(value)) > 0)
00583          conf->resync_threshold = tmp;
00584    } else if (!strcasecmp(name, AST_JB_CONF_IMPL)) {
00585       if (!ast_strlen_zero(value))
00586          snprintf(conf->impl, sizeof(conf->impl), "%s", value);
00587    } else if (!strcasecmp(name, AST_JB_CONF_TARGET_EXTRA)) {
00588       if (sscanf(value, "%30d", &tmp) == 1) {
00589          conf->target_extra = tmp;
00590       }
00591    } else if (!strcasecmp(name, AST_JB_CONF_LOG)) {
00592       ast_set2_flag(conf, ast_true(value), AST_JB_LOG);
00593    } else {
00594       return -1;
00595    }
00596    
00597    return 0;
00598 }
00599 
00600 
00601 void ast_jb_configure(struct ast_channel *chan, const struct ast_jb_conf *conf)
00602 {
00603    memcpy(&chan->jb.conf, conf, sizeof(*conf));
00604 }
00605 
00606 
00607 void ast_jb_get_config(const struct ast_channel *chan, struct ast_jb_conf *conf)
00608 {
00609    memcpy(conf, &chan->jb.conf, sizeof(*conf));
00610 }
00611 
00612 void ast_jb_empty_and_reset(struct ast_channel *c0, struct ast_channel *c1)
00613 {
00614    struct ast_jb *jb0 = &c0->jb;
00615    struct ast_jb *jb1 = &c1->jb;
00616    int c0_use_jb = ast_test_flag(jb0, JB_USE);
00617    int c0_jb_is_created = ast_test_flag(jb0, JB_CREATED);
00618    int c1_use_jb = ast_test_flag(jb1, JB_USE);
00619    int c1_jb_is_created = ast_test_flag(jb1, JB_CREATED);
00620 
00621    if (c0_use_jb && c0_jb_is_created && jb0->impl->empty_and_reset) {
00622       jb0->impl->empty_and_reset(jb0->jbobj);
00623    }
00624 
00625    if (c1_use_jb && c1_jb_is_created && jb1->impl->empty_and_reset) {
00626       jb1->impl->empty_and_reset(jb1->jbobj);
00627    }
00628 }
00629 
00630 /* Implementation functions */
00631 
00632 /* fixed */
00633 static void * jb_create_fixed(struct ast_jb_conf *general_config, long resynch_threshold)
00634 {
00635    struct fixed_jb_conf conf;
00636 
00637    conf.jbsize = general_config->max_size;
00638    conf.resync_threshold = resynch_threshold;
00639 
00640    return fixed_jb_new(&conf);
00641 }
00642 
00643 static void jb_destroy_fixed(void *jb)
00644 {
00645    struct fixed_jb *fixedjb = (struct fixed_jb *) jb;
00646    
00647    /* destroy the jb */
00648    fixed_jb_destroy(fixedjb);
00649 }
00650 
00651 
00652 static int jb_put_first_fixed(void *jb, struct ast_frame *fin, long now)
00653 {
00654    struct fixed_jb *fixedjb = (struct fixed_jb *) jb;
00655    int res;
00656    
00657    res = fixed_jb_put_first(fixedjb, fin, fin->len, fin->ts, now);
00658    
00659    return fixed_to_abstract_code[res];
00660 }
00661 
00662 
00663 static int jb_put_fixed(void *jb, struct ast_frame *fin, long now)
00664 {
00665    struct fixed_jb *fixedjb = (struct fixed_jb *) jb;
00666    int res;
00667    
00668    res = fixed_jb_put(fixedjb, fin, fin->len, fin->ts, now);
00669    
00670    return fixed_to_abstract_code[res];
00671 }
00672 
00673 
00674 static int jb_get_fixed(void *jb, struct ast_frame **fout, long now, long interpl)
00675 {
00676    struct fixed_jb *fixedjb = (struct fixed_jb *) jb;
00677    struct fixed_jb_frame frame;
00678    int res;
00679    
00680    res = fixed_jb_get(fixedjb, &frame, now, interpl);
00681    *fout = frame.data;
00682    
00683    return fixed_to_abstract_code[res];
00684 }
00685 
00686 
00687 static long jb_next_fixed(void *jb)
00688 {
00689    struct fixed_jb *fixedjb = (struct fixed_jb *) jb;
00690    
00691    return fixed_jb_next(fixedjb);
00692 }
00693 
00694 
00695 static int jb_remove_fixed(void *jb, struct ast_frame **fout)
00696 {
00697    struct fixed_jb *fixedjb = (struct fixed_jb *) jb;
00698    struct fixed_jb_frame frame;
00699    int res;
00700    
00701    res = fixed_jb_remove(fixedjb, &frame);
00702    *fout = frame.data;
00703    
00704    return fixed_to_abstract_code[res];
00705 }
00706 
00707 
00708 static void jb_force_resynch_fixed(void *jb)
00709 {
00710    struct fixed_jb *fixedjb = (struct fixed_jb *) jb;
00711    
00712    fixed_jb_set_force_resynch(fixedjb);
00713 }
00714 
00715 static void jb_empty_and_reset_fixed(void *jb)
00716 {
00717    struct fixed_jb *fixedjb = jb;
00718    struct fixed_jb_frame f;
00719 
00720    while (fixed_jb_remove(fixedjb, &f) == FIXED_JB_OK) {
00721       ast_frfree(f.data);
00722    }
00723 }
00724 
00725 /* adaptive */
00726 
00727 static void *jb_create_adaptive(struct ast_jb_conf *general_config, long resynch_threshold)
00728 {
00729    jb_conf jbconf;
00730    jitterbuf *adaptivejb;
00731 
00732    adaptivejb = jb_new();
00733    if (adaptivejb) {
00734       jbconf.max_jitterbuf = general_config->max_size;
00735       jbconf.resync_threshold = general_config->resync_threshold;
00736       jbconf.max_contig_interp = 10;
00737       jbconf.target_extra = general_config->target_extra;
00738       jb_setconf(adaptivejb, &jbconf);
00739    }
00740    
00741    return adaptivejb;
00742 }
00743 
00744 
00745 static void jb_destroy_adaptive(void *jb)
00746 {
00747    jitterbuf *adaptivejb = (jitterbuf *) jb;
00748    
00749    jb_destroy(adaptivejb);
00750 }
00751 
00752 
00753 static int jb_put_first_adaptive(void *jb, struct ast_frame *fin, long now)
00754 {
00755    return jb_put_adaptive(jb, fin, now);
00756 }
00757 
00758 
00759 static int jb_put_adaptive(void *jb, struct ast_frame *fin, long now)
00760 {
00761    jitterbuf *adaptivejb = (jitterbuf *) jb;
00762    int res;
00763    
00764    res = jb_put(adaptivejb, fin, JB_TYPE_VOICE, fin->len, fin->ts, now);
00765    
00766    return adaptive_to_abstract_code[res];
00767 }
00768 
00769 
00770 static int jb_get_adaptive(void *jb, struct ast_frame **fout, long now, long interpl)
00771 {
00772    jitterbuf *adaptivejb = (jitterbuf *) jb;
00773    jb_frame frame;
00774    int res;
00775    
00776    res = jb_get(adaptivejb, &frame, now, interpl);
00777    *fout = frame.data;
00778    
00779    return adaptive_to_abstract_code[res];
00780 }
00781 
00782 
00783 static long jb_next_adaptive(void *jb)
00784 {
00785    jitterbuf *adaptivejb = (jitterbuf *) jb;
00786    
00787    return jb_next(adaptivejb);
00788 }
00789 
00790 
00791 static int jb_remove_adaptive(void *jb, struct ast_frame **fout)
00792 {
00793    jitterbuf *adaptivejb = (jitterbuf *) jb;
00794    jb_frame frame;
00795    int res;
00796    
00797    res = jb_getall(adaptivejb, &frame);
00798    *fout = frame.data;
00799    
00800    return adaptive_to_abstract_code[res];
00801 }
00802 
00803 
00804 static void jb_force_resynch_adaptive(void *jb)
00805 {
00806 }
00807 
00808 static void jb_empty_and_reset_adaptive(void *jb)
00809 {
00810    jitterbuf *adaptivejb = jb;
00811    jb_frame f;
00812 
00813    while (jb_getall(adaptivejb, &f) == JB_OK) {
00814       ast_frfree(f.data);
00815    }
00816 
00817    jb_reset(adaptivejb);
00818 }

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