Mon Oct 8 12:39:27 2012

Asterisk developer's documentation


res_fax_spandsp.c File Reference

Spandsp T.38 and G.711 FAX Resource. More...

#include "asterisk.h"
#include <spandsp.h>
#include <spandsp/version.h>
#include "asterisk/logger.h"
#include "asterisk/module.h"
#include "asterisk/strings.h"
#include "asterisk/cli.h"
#include "asterisk/utils.h"
#include "asterisk/timing.h"
#include "asterisk/astobj2.h"
#include "asterisk/res_fax.h"

Go to the source code of this file.

Data Structures

struct  spandsp_fax_stats
struct  spandsp_pvt
struct  spandsp_pvt::frame_queue

Defines

#define SPANDSP_EXPOSE_INTERNAL_STRUCTURES
#define SPANDSP_FAX_SAMPLES   160
#define SPANDSP_FAX_TIMER_RATE   8000 / SPANDSP_FAX_SAMPLES

Functions

static void __reg_module (void)
static void __unreg_module (void)
static int load_module (void)
 load res_fax_spandsp
static void session_destroy (struct spandsp_pvt *p)
static void set_ecm (t30_state_t *t30_state, struct ast_fax_session_details *details)
static void set_file (t30_state_t *t30_state, struct ast_fax_session_details *details)
static void set_local_info (t30_state_t *t30_state, struct ast_fax_session_details *details)
static void set_logging (logging_state_t *state, struct ast_fax_session_details *details)
static int spandsp_fax_cancel (struct ast_fax_session *s)
static char * spandsp_fax_cli_show_capabilities (int fd)
static char * spandsp_fax_cli_show_session (struct ast_fax_session *s, int fd)
static char * spandsp_fax_cli_show_settings (int fd)
 Show res_fax_spandsp settings.
static char * spandsp_fax_cli_show_stats (int fd)
static void spandsp_fax_destroy (struct ast_fax_session *s)
 Destroy a spandsp fax session.
static void * spandsp_fax_new (struct ast_fax_session *s, struct ast_fax_tech_token *token)
 create an instance of the spandsp tech_pvt for a fax session
static struct ast_framespandsp_fax_read (struct ast_fax_session *s)
 Read a frame from the spandsp fax stack.
static int spandsp_fax_start (struct ast_fax_session *s)
static int spandsp_fax_switch_to_t38 (struct ast_fax_session *s)
static int spandsp_fax_write (struct ast_fax_session *s, const struct ast_frame *f)
 Write a frame to the spandsp fax stack.
static void spandsp_log (int level, const char *msg)
 Send spandsp log messages to asterisk.
static int spandsp_modems (struct ast_fax_session_details *details)
static void t30_phase_e_handler (t30_state_t *t30_state, void *data, int completion_code)
 Phase E handler callback.
static int t38_tx_packet_handler (t38_core_state_t *t38_core_state, void *data, const uint8_t *buf, int len, int count)
static int unload_module (void)
 unload res_fax_spandsp
static int update_stats (struct spandsp_pvt *p, int completion_code)

Variables

static struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "Spandsp G.711 and T.38 FAX Technologies" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = "ac1f6a56484a8820659555499174e588" , .load = load_module, .unload = unload_module, }
static struct ast_module_infoast_module_info = &__mod_info
static struct ast_fax_tech spandsp_fax_tech
struct {
   spandsp_fax_stats   g711
   ast_mutex_t   lock
   spandsp_fax_stats   t38
spandsp_global_stats


Detailed Description

Spandsp T.38 and G.711 FAX Resource.

Author:
Matthew Nicholson <mnicholson@digium.com>
This module registers the Spandsp FAX technology with the res_fax module.

Definition in file res_fax_spandsp.c.


Define Documentation

#define SPANDSP_EXPOSE_INTERNAL_STRUCTURES

Definition at line 38 of file res_fax_spandsp.c.

#define SPANDSP_FAX_SAMPLES   160

Definition at line 51 of file res_fax_spandsp.c.

Referenced by spandsp_fax_read().

#define SPANDSP_FAX_TIMER_RATE   8000 / SPANDSP_FAX_SAMPLES

Definition at line 52 of file res_fax_spandsp.c.

Referenced by spandsp_fax_start().


Function Documentation

static void __reg_module ( void   )  [static]

Definition at line 800 of file res_fax_spandsp.c.

static void __unreg_module ( void   )  [static]

Definition at line 800 of file res_fax_spandsp.c.

static int load_module ( void   )  [static]

load res_fax_spandsp

Definition at line 781 of file res_fax_spandsp.c.

References ast_fax_tech_register(), ast_log(), AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_SUCCESS, ast_mutex_init, LOG_ERROR, ast_fax_tech::module, and spandsp_fax_tech.

00782 {
00783    ast_mutex_init(&spandsp_global_stats.lock);
00784    spandsp_fax_tech.module = ast_module_info->self;
00785    if (ast_fax_tech_register(&spandsp_fax_tech) < 0) {
00786       ast_log(LOG_ERROR, "failed to register FAX technology\n");
00787       return AST_MODULE_LOAD_DECLINE;
00788    }
00789 
00790    /* prevent logging to stderr */
00791    span_set_message_handler(NULL);
00792 
00793    return AST_MODULE_LOAD_SUCCESS;
00794 }

static void session_destroy ( struct spandsp_pvt p  )  [static]

Definition at line 141 of file res_fax_spandsp.c.

References ast_frfree, AST_LIST_REMOVE_HEAD, ast_timer_close(), and f.

00142 {
00143    struct ast_frame *f;
00144 
00145    t30_terminate(p->t30_state);
00146    p->isdone = 1;
00147 
00148    ast_timer_close(p->timer);
00149 
00150    fax_release(&p->fax_state);
00151    t38_terminal_release(&p->t38_state);
00152 
00153    while ((f = AST_LIST_REMOVE_HEAD(&p->read_frames, frame_list))) {
00154       ast_frfree(f);
00155    }
00156 }

static void set_ecm ( t30_state_t *  t30_state,
struct ast_fax_session_details details 
) [static]

Definition at line 410 of file res_fax_spandsp.c.

References ast_fax_session_details::ecm, and ast_fax_session_details::option.

00411 {
00412    t30_set_ecm_capability(t30_state, details->option.ecm);
00413    t30_set_supported_compressions(t30_state, T30_SUPPORT_T4_1D_COMPRESSION | T30_SUPPORT_T4_2D_COMPRESSION | T30_SUPPORT_T6_COMPRESSION);
00414 }

static void set_file ( t30_state_t *  t30_state,
struct ast_fax_session_details details 
) [static]

Definition at line 398 of file res_fax_spandsp.c.

References AST_FAX_TECH_RECEIVE, AST_LIST_FIRST, ast_fax_session_details::caps, and ast_fax_session_details::documents.

00399 {
00400    if (details->caps & AST_FAX_TECH_RECEIVE) {
00401       t30_set_rx_file(t30_state, AST_LIST_FIRST(&details->documents)->filename, -1);
00402    } else {
00403       /* if not AST_FAX_TECH_RECEIVE, assume AST_FAX_TECH_SEND, this
00404        * should be safe because we ensure either RECEIVE or SEND is
00405        * indicated in spandsp_fax_new() */
00406       t30_set_tx_file(t30_state, AST_LIST_FIRST(&details->documents)->filename, -1, -1);
00407    }
00408 }

static void set_local_info ( t30_state_t *  t30_state,
struct ast_fax_session_details details 
) [static]

Definition at line 387 of file res_fax_spandsp.c.

References ast_strlen_zero(), ast_fax_session_details::headerinfo, and ast_fax_session_details::localstationid.

00388 {
00389    if (!ast_strlen_zero(details->localstationid)) {
00390       t30_set_tx_ident(t30_state, details->localstationid);
00391    }
00392 
00393    if (!ast_strlen_zero(details->headerinfo)) {
00394       t30_set_tx_page_header_info(t30_state, details->headerinfo);
00395    }
00396 }

static void set_logging ( logging_state_t *  state,
struct ast_fax_session_details details 
) [static]

Definition at line 375 of file res_fax_spandsp.c.

References ast_fax_session_details::debug, ast_fax_session_details::option, and spandsp_log().

00376 {
00377    int level = SPAN_LOG_WARNING;
00378 
00379         if (details->option.debug) {
00380       level = SPAN_LOG_DEBUG_3;
00381    }
00382 
00383    span_log_set_message_handler(state, spandsp_log);
00384    span_log_set_level(state, SPAN_LOG_SHOW_SEVERITY | SPAN_LOG_SHOW_PROTOCOL | level);
00385 }

static int spandsp_fax_cancel ( struct ast_fax_session s  )  [static]

Definition at line 654 of file res_fax_spandsp.c.

References spandsp_pvt::isdone, spandsp_pvt::t30_state, and ast_fax_session::tech_pvt.

00655 {
00656    struct spandsp_pvt *p = s->tech_pvt;
00657    t30_terminate(p->t30_state);
00658    p->isdone = 1;
00659    return 0;
00660 }

static char * spandsp_fax_cli_show_capabilities ( int  fd  )  [static]

Definition at line 683 of file res_fax_spandsp.c.

References ast_cli(), and CLI_SUCCESS.

00684 {
00685    ast_cli(fd, "SEND RECEIVE T.38 G.711\n\n");
00686    return  CLI_SUCCESS;
00687 }

static char * spandsp_fax_cli_show_session ( struct ast_fax_session s,
int  fd 
) [static]

Definition at line 690 of file res_fax_spandsp.c.

References ao2_lock, ao2_unlock, ast_cli(), ast_fax_state_to_str(), AST_FAX_STATE_UNINITIALIZED, AST_FAX_TECH_RECEIVE, AST_FAX_TECH_SEND, ast_fax_session_details::caps, CLI_SUCCESS, ast_fax_session::details, ast_fax_session::id, ast_fax_session::state, spandsp_pvt::stats, spandsp_pvt::t30_state, and ast_fax_session::tech_pvt.

00691 {
00692    struct spandsp_pvt *p = s->tech_pvt;
00693    t30_stats_t stats;
00694 
00695    ao2_lock(s);
00696    ast_cli(fd, "%-22s : %d\n", "session", s->id);
00697    ast_cli(fd, "%-22s : %s\n", "operation", (s->details->caps & AST_FAX_TECH_RECEIVE) ? "Receive" : "Transmit");
00698    ast_cli(fd, "%-22s : %s\n", "state", ast_fax_state_to_str(s->state));
00699    if (s->state != AST_FAX_STATE_UNINITIALIZED) {
00700       t30_get_transfer_statistics(p->t30_state, &stats);
00701       ast_cli(fd, "%-22s : %s\n", "Last Status", t30_completion_code_to_str(stats.current_status));
00702       ast_cli(fd, "%-22s : %s\n", "ECM Mode", stats.error_correcting_mode ? "Yes" : "No");
00703       ast_cli(fd, "%-22s : %d\n", "Data Rate", stats.bit_rate);
00704       ast_cli(fd, "%-22s : %dx%d\n", "Image Resolution", stats.x_resolution, stats.y_resolution);
00705 #if SPANDSP_RELEASE_DATE >= 20090220
00706       ast_cli(fd, "%-22s : %d\n", "Page Number", ((s->details->caps & AST_FAX_TECH_RECEIVE) ? stats.pages_rx : stats.pages_tx) + 1);
00707 #else
00708       ast_cli(fd, "%-22s : %d\n", "Page Number", stats.pages_transferred + 1);
00709 #endif
00710       ast_cli(fd, "%-22s : %s\n", "File Name", s->details->caps & AST_FAX_TECH_RECEIVE ? p->t30_state->rx_file : p->t30_state->tx_file);
00711 
00712       ast_cli(fd, "\nData Statistics:\n");
00713 #if SPANDSP_RELEASE_DATE >= 20090220
00714       ast_cli(fd, "%-22s : %d\n", "Tx Pages", stats.pages_tx);
00715       ast_cli(fd, "%-22s : %d\n", "Rx Pages", stats.pages_rx);
00716 #else
00717       ast_cli(fd, "%-22s : %d\n", "Tx Pages", (s->details->caps & AST_FAX_TECH_SEND) ? stats.pages_transferred : 0);
00718       ast_cli(fd, "%-22s : %d\n", "Rx Pages", (s->details->caps & AST_FAX_TECH_RECEIVE) ? stats.pages_transferred : 0);
00719 #endif
00720       ast_cli(fd, "%-22s : %d\n", "Longest Bad Line Run", stats.longest_bad_row_run);
00721       ast_cli(fd, "%-22s : %d\n", "Total Bad Lines", stats.bad_rows);
00722    }
00723    ao2_unlock(s);
00724    ast_cli(fd, "\n\n");
00725    return CLI_SUCCESS;
00726 }

static char * spandsp_fax_cli_show_settings ( int  fd  )  [static]

Show res_fax_spandsp settings.

Definition at line 766 of file res_fax_spandsp.c.

References CLI_SUCCESS.

00767 {
00768    /* no settings at the moment */
00769    return CLI_SUCCESS;
00770 }

static char * spandsp_fax_cli_show_stats ( int  fd  )  [static]

Definition at line 729 of file res_fax_spandsp.c.

References ast_cli(), ast_mutex_lock, ast_mutex_unlock, and CLI_SUCCESS.

00730 {
00731    ast_mutex_lock(&spandsp_global_stats.lock);
00732    ast_cli(fd, "\n%-20.20s\n", "Spandsp G.711");
00733    ast_cli(fd, "%-20.20s : %d\n", "Success", spandsp_global_stats.g711.success);
00734    ast_cli(fd, "%-20.20s : %d\n", "Switched to T.38", spandsp_global_stats.g711.switched);
00735    ast_cli(fd, "%-20.20s : %d\n", "Call Dropped", spandsp_global_stats.g711.call_dropped);
00736    ast_cli(fd, "%-20.20s : %d\n", "No FAX", spandsp_global_stats.g711.nofax);
00737    ast_cli(fd, "%-20.20s : %d\n", "Negotiation Failed", spandsp_global_stats.g711.neg_failed);
00738    ast_cli(fd, "%-20.20s : %d\n", "Train Failure", spandsp_global_stats.g711.failed_to_train);
00739    ast_cli(fd, "%-20.20s : %d\n", "Retries Exceeded", spandsp_global_stats.g711.retries_exceeded);
00740    ast_cli(fd, "%-20.20s : %d\n", "Protocol Error", spandsp_global_stats.g711.protocol_error);
00741    ast_cli(fd, "%-20.20s : %d\n", "TX Protocol Error", spandsp_global_stats.g711.tx_protocol_error);
00742    ast_cli(fd, "%-20.20s : %d\n", "RX Protocol Error", spandsp_global_stats.g711.rx_protocol_error);
00743    ast_cli(fd, "%-20.20s : %d\n", "File Error", spandsp_global_stats.g711.file_error);
00744    ast_cli(fd, "%-20.20s : %d\n", "Memory Error", spandsp_global_stats.g711.mem_error);
00745    ast_cli(fd, "%-20.20s : %d\n", "Unknown Error", spandsp_global_stats.g711.unknown_error);
00746 
00747    ast_cli(fd, "\n%-20.20s\n", "Spandsp T.38");
00748    ast_cli(fd, "%-20.20s : %d\n", "Success", spandsp_global_stats.t38.success);
00749    ast_cli(fd, "%-20.20s : %d\n", "Call Dropped", spandsp_global_stats.t38.call_dropped);
00750    ast_cli(fd, "%-20.20s : %d\n", "No FAX", spandsp_global_stats.t38.nofax);
00751    ast_cli(fd, "%-20.20s : %d\n", "Negotiation Failed", spandsp_global_stats.t38.neg_failed);
00752    ast_cli(fd, "%-20.20s : %d\n", "Train Failure", spandsp_global_stats.t38.failed_to_train);
00753    ast_cli(fd, "%-20.20s : %d\n", "Retries Exceeded", spandsp_global_stats.t38.retries_exceeded);
00754    ast_cli(fd, "%-20.20s : %d\n", "Protocol Error", spandsp_global_stats.t38.protocol_error);
00755    ast_cli(fd, "%-20.20s : %d\n", "TX Protocol Error", spandsp_global_stats.t38.tx_protocol_error);
00756    ast_cli(fd, "%-20.20s : %d\n", "RX Protocol Error", spandsp_global_stats.t38.rx_protocol_error);
00757    ast_cli(fd, "%-20.20s : %d\n", "File Error", spandsp_global_stats.t38.file_error);
00758    ast_cli(fd, "%-20.20s : %d\n", "Memory Error", spandsp_global_stats.t38.mem_error);
00759    ast_cli(fd, "%-20.20s : %d\n", "Unknown Error", spandsp_global_stats.t38.unknown_error);
00760    ast_mutex_unlock(&spandsp_global_stats.lock);
00761 
00762    return CLI_SUCCESS;
00763 }

static void spandsp_fax_destroy ( struct ast_fax_session s  )  [static]

Destroy a spandsp fax session.

Definition at line 501 of file res_fax_spandsp.c.

References ast_free, ast_fax_session::fd, session_destroy(), and ast_fax_session::tech_pvt.

00502 {
00503    struct spandsp_pvt *p = s->tech_pvt;
00504 
00505    session_destroy(p);
00506    ast_free(p);
00507    s->tech_pvt = NULL;
00508    s->fd = -1;
00509 }

static void * spandsp_fax_new ( struct ast_fax_session s,
struct ast_fax_tech_token *  token 
) [static]

create an instance of the spandsp tech_pvt for a fax session

Definition at line 442 of file res_fax_spandsp.c.

References ast_calloc, AST_FAX_STATE_INITIALIZED, AST_FAX_TECH_AUDIO, AST_FAX_TECH_RECEIVE, AST_FAX_TECH_SEND, AST_FAX_TECH_T38, ast_free, AST_LIST_HEAD_INIT, ast_log(), ast_timer_fd(), ast_timer_open(), ast_fax_session_details::caps, ast_fax_session::channame, ast_fax_session::details, ast_fax_session::fd, ast_fax_session::id, LOG_ERROR, set_logging(), ast_fax_session::state, and t38_tx_packet_handler().

00443 {
00444    struct spandsp_pvt *p;
00445    int caller_mode;
00446 
00447    if ((!(p = ast_calloc(1, sizeof(*p))))) {
00448       ast_log(LOG_ERROR, "Cannot initialize the spandsp private FAX technology structure.\n");
00449       goto e_return;
00450    }
00451 
00452    AST_LIST_HEAD_INIT(&p->read_frames);
00453 
00454    if (s->details->caps & AST_FAX_TECH_RECEIVE) {
00455       caller_mode = 0;
00456    } else if (s->details->caps & AST_FAX_TECH_SEND) {
00457       caller_mode = 1;
00458    } else {
00459       ast_log(LOG_ERROR, "Are we sending or receiving? The FAX requirements (capabilities: 0x%X) were not properly set.\n", s->details->caps);
00460       goto e_free;
00461    }
00462 
00463    if (!(p->timer = ast_timer_open())) {
00464       ast_log(LOG_ERROR, "Channel '%s' FAX session '%d' failed to create timing source.\n", s->channame, s->id);
00465       goto e_free;
00466    }
00467 
00468    s->fd = ast_timer_fd(p->timer);
00469 
00470    p->stats = &spandsp_global_stats.g711;
00471 
00472    if (s->details->caps & AST_FAX_TECH_T38) {
00473       if ((s->details->caps & AST_FAX_TECH_AUDIO) == 0) {
00474          /* audio mode was not requested, start in T.38 mode */
00475          p->ist38 = 1;
00476          p->stats = &spandsp_global_stats.t38;
00477       }
00478 
00479       /* init t38 stuff */
00480       t38_terminal_init(&p->t38_state, caller_mode, t38_tx_packet_handler, p);
00481       set_logging(&p->t38_state.logging, s->details);
00482    }
00483 
00484    if (s->details->caps & AST_FAX_TECH_AUDIO) {
00485       /* init audio stuff */
00486       fax_init(&p->fax_state, caller_mode);
00487       set_logging(&p->fax_state.logging, s->details);
00488    }
00489 
00490    s->state = AST_FAX_STATE_INITIALIZED;
00491    return p;
00492 
00493 e_free:
00494    ast_free(p);
00495 e_return:
00496    return NULL;
00497 }

static struct ast_frame * spandsp_fax_read ( struct ast_fax_session s  )  [static]

Read a frame from the spandsp fax stack.

Definition at line 513 of file res_fax_spandsp.c.

References ast_debug, AST_FAX_STATE_COMPLETE, AST_FORMAT_SLINEAR, AST_FRAME_SET_BUFFER, AST_FRAME_VOICE, AST_FRIENDLY_OFFSET, ast_frisolate(), AST_LIST_REMOVE_HEAD, ast_null_frame, ast_timer_ack(), f, spandsp_pvt::fax_state, ast_frame::frametype, ast_fax_session::id, spandsp_pvt::isdone, spandsp_pvt::ist38, spandsp_pvt::read_frames, SPANDSP_FAX_SAMPLES, ast_fax_session::state, spandsp_pvt::t38_state, ast_fax_session::tech_pvt, and spandsp_pvt::timer.

00514 {
00515    struct spandsp_pvt *p = s->tech_pvt;
00516    uint8_t buffer[AST_FRIENDLY_OFFSET + SPANDSP_FAX_SAMPLES * sizeof(uint16_t)];
00517    int16_t *buf = (int16_t *) (buffer + AST_FRIENDLY_OFFSET);
00518    int samples;
00519 
00520    struct ast_frame fax_frame = {
00521       .frametype = AST_FRAME_VOICE,
00522       .subclass.codec = AST_FORMAT_SLINEAR,
00523       .src = "res_fax_spandsp_g711",
00524    };
00525 
00526    struct ast_frame *f = &fax_frame;
00527 
00528    ast_timer_ack(p->timer, 1);
00529 
00530    /* XXX do we need to lock here? */
00531    if (p->isdone) {
00532       s->state = AST_FAX_STATE_COMPLETE;
00533       ast_debug(5, "FAX session '%d' is complete.\n", s->id);
00534       return NULL;
00535    }
00536 
00537    if (p->ist38) {
00538       t38_terminal_send_timeout(&p->t38_state, SPANDSP_FAX_SAMPLES);
00539       if ((f = AST_LIST_REMOVE_HEAD(&p->read_frames, frame_list))) {
00540          return f;
00541       }
00542    } else {
00543       if ((samples = fax_tx(&p->fax_state, buf, SPANDSP_FAX_SAMPLES)) > 0) {
00544          f->samples = samples;
00545          AST_FRAME_SET_BUFFER(f, buffer, AST_FRIENDLY_OFFSET, samples * sizeof(int16_t));
00546          return ast_frisolate(f);
00547       }
00548    }
00549 
00550    return &ast_null_frame;
00551 }

static int spandsp_fax_start ( struct ast_fax_session s  )  [static]

Definition at line 581 of file res_fax_spandsp.c.

References AST_FAX_STATE_ACTIVE, AST_FAX_STATE_OPEN, ast_log(), ast_timer_set_rate(), ast_fax_session::details, spandsp_pvt::fax_state, ast_fax_t38_parameters::fill_bit_removal, ast_fax_session::id, spandsp_pvt::ist38, LOG_ERROR, ast_fax_t38_parameters::max_ifp, set_ecm(), set_file(), set_local_info(), set_logging(), SPANDSP_FAX_TIMER_RATE, spandsp_modems(), ast_fax_session::state, t30_phase_e_handler(), spandsp_pvt::t30_state, spandsp_pvt::t38_core_state, spandsp_pvt::t38_state, ast_fax_session::tech_pvt, ast_fax_session_details::their_t38_parameters, spandsp_pvt::timer, ast_fax_t38_parameters::transcoding_jbig, ast_fax_t38_parameters::transcoding_mmr, and TRUE.

Referenced by spandsp_fax_switch_to_t38().

00582 {
00583    struct spandsp_pvt *p = s->tech_pvt;
00584 
00585    s->state = AST_FAX_STATE_OPEN;
00586 
00587    if (p->ist38) {
00588 #if SPANDSP_RELEASE_DATE >= 20080725
00589       /* for spandsp shaphots 0.0.6 and higher */
00590       p->t30_state = &p->t38_state.t30;
00591       p->t38_core_state = &p->t38_state.t38_fe.t38;
00592 #else
00593       /* for spandsp releases 0.0.5 */
00594       p->t30_state = &p->t38_state.t30_state;
00595       p->t38_core_state = &p->t38_state.t38;
00596 #endif
00597    } else {
00598 #if SPANDSP_RELEASE_DATE >= 20080725
00599       /* for spandsp shaphots 0.0.6 and higher */
00600       p->t30_state = &p->fax_state.t30;
00601 #else
00602       /* for spandsp release 0.0.5 */
00603       p->t30_state = &p->fax_state.t30_state;
00604 #endif
00605    }
00606 
00607    set_logging(&p->t30_state->logging, s->details);
00608 
00609    /* set some parameters */
00610    set_local_info(p->t30_state, s->details);
00611    set_file(p->t30_state, s->details);
00612    set_ecm(p->t30_state, s->details);
00613    t30_set_supported_modems(p->t30_state, spandsp_modems(s->details));
00614 
00615    /* perhaps set_transmit_on_idle() should be called */
00616 
00617    t30_set_phase_e_handler(p->t30_state, t30_phase_e_handler, s);
00618 
00619    /* set T.38 parameters */
00620    if (p->ist38) {
00621       set_logging(&p->t38_core_state->logging, s->details);
00622 
00623       t38_set_max_datagram_size(p->t38_core_state, s->details->their_t38_parameters.max_ifp);
00624 
00625       if (s->details->their_t38_parameters.fill_bit_removal) {
00626          t38_set_fill_bit_removal(p->t38_core_state, TRUE);
00627       }
00628 
00629       if (s->details->their_t38_parameters.transcoding_mmr) {
00630          t38_set_mmr_transcoding(p->t38_core_state, TRUE);
00631       }
00632 
00633       if (s->details->their_t38_parameters.transcoding_jbig) {
00634          t38_set_jbig_transcoding(p->t38_core_state, TRUE);
00635       }
00636    } else {
00637       /* have the fax stack generate silence if it has no data to send */
00638       fax_set_transmit_on_idle(&p->fax_state, 1);
00639    }
00640 
00641 
00642    /* start the timer */
00643    if (ast_timer_set_rate(p->timer, SPANDSP_FAX_TIMER_RATE)) {
00644       ast_log(LOG_ERROR, "FAX session '%d' error setting rate on timing source.\n", s->id);
00645       return -1;
00646    }
00647 
00648    s->state = AST_FAX_STATE_ACTIVE;
00649 
00650    return 0;
00651 }

static int spandsp_fax_switch_to_t38 ( struct ast_fax_session s  )  [static]

Definition at line 663 of file res_fax_spandsp.c.

References ast_atomic_fetchadd_int(), ast_fax_session::details, spandsp_pvt::ist38, ast_fax_session_details::option, spandsp_fax_start(), spandsp_pvt::stats, ast_fax_session_details::switch_to_t38, spandsp_fax_stats::switched, spandsp_pvt::t30_state, and ast_fax_session::tech_pvt.

00664 {
00665    struct spandsp_pvt *p = s->tech_pvt;
00666 
00667    /* prevent the phase E handler from running, this is not a real termination */
00668    t30_set_phase_e_handler(p->t30_state, NULL, NULL);
00669 
00670    t30_terminate(p->t30_state);
00671 
00672    s->details->option.switch_to_t38 = 1;
00673    ast_atomic_fetchadd_int(&p->stats->switched, 1);
00674 
00675    p->ist38 = 1;
00676    p->stats = &spandsp_global_stats.t38;
00677    spandsp_fax_start(s);
00678 
00679    return 0;
00680 }

static int spandsp_fax_write ( struct ast_fax_session s,
const struct ast_frame f 
) [static]

Write a frame to the spandsp fax stack.

Parameters:
s a fax session
f the frame to write
Note:
res_fax does not currently use the return value of this function. Also the fax_rx() function never fails.
Return values:
0 success
-1 failure

Definition at line 563 of file res_fax_spandsp.c.

References AST_FAX_STATE_COMPLETE, ast_fax_state_to_str(), ast_log(), f, spandsp_pvt::fax_state, ast_fax_session::id, spandsp_pvt::ist38, LOG_WARNING, ast_fax_session::state, spandsp_pvt::t38_core_state, and ast_fax_session::tech_pvt.

00564 {
00565    struct spandsp_pvt *p = s->tech_pvt;
00566 
00567    /* XXX do we need to lock here? */
00568    if (s->state == AST_FAX_STATE_COMPLETE) {
00569       ast_log(LOG_WARNING, "FAX session '%d' is in the '%s' state.\n", s->id, ast_fax_state_to_str(s->state));
00570       return -1;
00571    }
00572 
00573    if (p->ist38) {
00574       return t38_core_rx_ifp_packet(p->t38_core_state, f->data.ptr, f->datalen, f->seqno);
00575    } else {
00576       return fax_rx(&p->fax_state, f->data.ptr, f->samples);
00577    }
00578 }

static void spandsp_log ( int  level,
const char *  msg 
) [static]

Send spandsp log messages to asterisk.

Parameters:
level the spandsp logging level
msg the log message
Note:
This function is a callback function called by spandsp.

Definition at line 364 of file res_fax_spandsp.c.

References ast_fax_log(), ast_log(), LOG_DEBUG, LOG_ERROR, and LOG_WARNING.

Referenced by set_logging().

00365 {
00366    if (level == SPAN_LOG_ERROR) {
00367       ast_log(LOG_ERROR, "%s", msg);
00368    } else if (level == SPAN_LOG_WARNING) {
00369       ast_log(LOG_WARNING, "%s", msg);
00370    } else {
00371       ast_fax_log(LOG_DEBUG, msg);
00372    }
00373 }

static int spandsp_modems ( struct ast_fax_session_details details  )  [static]

Definition at line 416 of file res_fax_spandsp.c.

References AST_FAX_MODEM_V17, AST_FAX_MODEM_V27, AST_FAX_MODEM_V29, AST_FAX_MODEM_V34, ast_log(), LOG_WARNING, and ast_fax_session_details::modems.

Referenced by spandsp_fax_start().

00417 {
00418    int modems = 0;
00419    if (AST_FAX_MODEM_V17 & details->modems) {
00420       modems |= T30_SUPPORT_V17;
00421    }
00422    if (AST_FAX_MODEM_V27 & details->modems) {
00423       modems |= T30_SUPPORT_V27TER;
00424    }
00425    if (AST_FAX_MODEM_V29 & details->modems) {
00426       modems |= T30_SUPPORT_V29;
00427    }
00428    if (AST_FAX_MODEM_V34 & details->modems) {
00429 #if defined(T30_SUPPORT_V34)
00430       modems |= T30_SUPPORT_V34;
00431 #elif defined(T30_SUPPORT_V34HDX)
00432       modems |= T30_SUPPORT_V34HDX;
00433 #else
00434       ast_log(LOG_WARNING, "v34 not supported in this version of spandsp\n");
00435 #endif
00436    }
00437 
00438    return modems;
00439 }

static void t30_phase_e_handler ( t30_state_t *  t30_state,
void *  data,
int  completion_code 
) [static]

Phase E handler callback.

Parameters:
t30_state the span t30 state
data this will be the ast_fax_session
completion_code the result of the fax session
This function pulls stats from the spandsp stack and stores them for res_fax to use later.

Definition at line 309 of file res_fax_spandsp.c.

References ast_debug, AST_FAX_TECH_RECEIVE, ast_string_field_build, ast_string_field_set, ast_fax_session_details::caps, ast_fax_session::details, ast_fax_session::id, spandsp_pvt::isdone, ast_fax_session_details::pages_transferred, ast_fax_session_details::result, ast_fax_session_details::resultstr, spandsp_pvt::stats, ast_fax_session::tech_pvt, and update_stats().

Referenced by spandsp_fax_start().

00310 {
00311    struct ast_fax_session *s = data;
00312    struct spandsp_pvt *p = s->tech_pvt;
00313    char headerinfo[T30_MAX_PAGE_HEADER_INFO + 1];
00314    const char *c;
00315    t30_stats_t stats;
00316 
00317    ast_debug(5, "FAX session '%d' entering phase E\n", s->id);
00318 
00319    p->isdone = 1;
00320 
00321    update_stats(p, completion_code);
00322 
00323    t30_get_transfer_statistics(t30_state, &stats);
00324 
00325    if (completion_code == T30_ERR_OK) {
00326       ast_string_field_set(s->details, result, "SUCCESS");
00327    } else {
00328       ast_string_field_set(s->details, result, "FAILED");
00329       ast_string_field_set(s->details, error, t30_completion_code_to_str(completion_code));
00330    }
00331 
00332    ast_string_field_set(s->details, resultstr, t30_completion_code_to_str(completion_code));
00333 
00334    ast_debug(5, "FAX session '%d' completed with result: %s (%s)\n", s->id, s->details->result, s->details->resultstr);
00335 
00336    if ((c = t30_get_tx_ident(t30_state))) {
00337       ast_string_field_set(s->details, localstationid, c);
00338    }
00339 
00340    if ((c = t30_get_rx_ident(t30_state))) {
00341       ast_string_field_set(s->details, remotestationid, c);
00342    }
00343 
00344 #if SPANDSP_RELEASE_DATE >= 20090220
00345    s->details->pages_transferred = (s->details->caps & AST_FAX_TECH_RECEIVE) ? stats.pages_rx : stats.pages_tx;
00346 #else
00347    s->details->pages_transferred = stats.pages_transferred;
00348 #endif
00349 
00350    ast_string_field_build(s->details, transfer_rate, "%d", stats.bit_rate);
00351 
00352    ast_string_field_build(s->details, resolution, "%dx%d", stats.x_resolution, stats.y_resolution);
00353 
00354    t30_get_tx_page_header_info(t30_state, headerinfo);
00355    ast_string_field_set(s->details, headerinfo, headerinfo);
00356 }

static int t38_tx_packet_handler ( t38_core_state_t *  t38_core_state,
void *  data,
const uint8_t *  buf,
int  len,
int  count 
) [static]

Definition at line 161 of file res_fax_spandsp.c.

References AST_FRAME_MODEM, AST_FRAME_SET_BUFFER, ast_frisolate(), AST_LIST_INSERT_TAIL, AST_MODEM_T38, f, ast_frame::frametype, and spandsp_pvt::read_frames.

00162 {
00163    struct spandsp_pvt *p = data;
00164    struct ast_frame fax_frame = {
00165       .frametype = AST_FRAME_MODEM,
00166       .subclass.integer = AST_MODEM_T38,
00167       .src = "res_fax_spandsp_t38",
00168    };
00169 
00170    struct ast_frame *f = &fax_frame;
00171 
00172 
00173    /* TODO: Asterisk does not provide means of resending the same packet multiple
00174      times so count is ignored at the moment */
00175 
00176    AST_FRAME_SET_BUFFER(f, buf, 0, len);
00177 
00178    if (!(f = ast_frisolate(f))) {
00179       return -1;
00180    }
00181 
00182    /* no need to lock, this all runs in the same thread */
00183    AST_LIST_INSERT_TAIL(&p->read_frames, f, frame_list);
00184 
00185    return 0;
00186 }

static int unload_module ( void   )  [static]

unload res_fax_spandsp

Definition at line 773 of file res_fax_spandsp.c.

References ast_fax_tech_unregister(), AST_MODULE_LOAD_SUCCESS, ast_mutex_destroy, and spandsp_fax_tech.

static int update_stats ( struct spandsp_pvt p,
int  completion_code 
) [static]

Definition at line 188 of file res_fax_spandsp.c.

References ast_atomic_fetchadd_int(), ast_log(), spandsp_fax_stats::call_dropped, spandsp_fax_stats::failed_to_train, spandsp_fax_stats::file_error, LOG_WARNING, spandsp_fax_stats::mem_error, spandsp_fax_stats::neg_failed, spandsp_fax_stats::nofax, spandsp_fax_stats::protocol_error, spandsp_fax_stats::retries_exceeded, spandsp_fax_stats::rx_protocol_error, spandsp_pvt::stats, spandsp_fax_stats::success, spandsp_fax_stats::tx_protocol_error, and spandsp_fax_stats::unknown_error.

Referenced by t30_phase_e_handler().

00189 {
00190    switch (completion_code) {
00191    case T30_ERR_OK:
00192       ast_atomic_fetchadd_int(&p->stats->success, 1);
00193       break;
00194 
00195    /* Link problems */
00196    case T30_ERR_CEDTONE:            /*! The CED tone exceeded 5s */
00197    case T30_ERR_T0_EXPIRED:         /*! Timed out waiting for initial communication */
00198    case T30_ERR_T1_EXPIRED:         /*! Timed out waiting for the first message */
00199    case T30_ERR_T3_EXPIRED:         /*! Timed out waiting for procedural interrupt */
00200    case T30_ERR_HDLC_CARRIER:       /*! The HDLC carrier did not stop in a timely manner */
00201    case T30_ERR_CANNOT_TRAIN:       /*! Failed to train with any of the compatible modems */
00202       ast_atomic_fetchadd_int(&p->stats->failed_to_train, 1);
00203       break;
00204 
00205    case T30_ERR_OPER_INT_FAIL:      /*! Operator intervention failed */
00206    case T30_ERR_INCOMPATIBLE:       /*! Far end is not compatible */
00207    case T30_ERR_RX_INCAPABLE:       /*! Far end is not able to receive */
00208    case T30_ERR_TX_INCAPABLE:       /*! Far end is not able to transmit */
00209    case T30_ERR_NORESSUPPORT:       /*! Far end cannot receive at the resolution of the image */
00210    case T30_ERR_NOSIZESUPPORT:      /*! Far end cannot receive at the size of image */
00211       ast_atomic_fetchadd_int(&p->stats->neg_failed, 1);
00212       break;
00213 
00214    case T30_ERR_UNEXPECTED:         /*! Unexpected message received */
00215       ast_atomic_fetchadd_int(&p->stats->protocol_error, 1);
00216       break;
00217 
00218    /* Phase E status values returned to a transmitter */
00219    case T30_ERR_TX_BADDCS:          /*! Received bad response to DCS or training */
00220    case T30_ERR_TX_BADPG:           /*! Received a DCN from remote after sending a page */
00221    case T30_ERR_TX_ECMPHD:          /*! Invalid ECM response received from receiver */
00222    case T30_ERR_TX_GOTDCN:          /*! Received a DCN while waiting for a DIS */
00223    case T30_ERR_TX_INVALRSP:        /*! Invalid response after sending a page */
00224    case T30_ERR_TX_NODIS:           /*! Received other than DIS while waiting for DIS */
00225    case T30_ERR_TX_PHBDEAD:         /*! Received no response to DCS, training or TCF */
00226    case T30_ERR_TX_PHDDEAD:         /*! No response after sending a page */
00227    case T30_ERR_TX_T5EXP:           /*! Timed out waiting for receiver ready (ECM mode) */
00228       ast_atomic_fetchadd_int(&p->stats->tx_protocol_error, 1);
00229       break;
00230 
00231    /* Phase E status values returned to a receiver */
00232    case T30_ERR_RX_ECMPHD:          /*! Invalid ECM response received from transmitter */
00233    case T30_ERR_RX_GOTDCS:          /*! DCS received while waiting for DTC */
00234    case T30_ERR_RX_INVALCMD:        /*! Unexpected command after page received */
00235    case T30_ERR_RX_NOCARRIER:       /*! Carrier lost during fax receive */
00236    case T30_ERR_RX_NOEOL:           /*! Timed out while waiting for EOL (end Of line) */
00237       ast_atomic_fetchadd_int(&p->stats->rx_protocol_error, 1);
00238       break;
00239    case T30_ERR_RX_NOFAX:           /*! Timed out while waiting for first line */
00240       ast_atomic_fetchadd_int(&p->stats->nofax, 1);
00241       break;
00242    case T30_ERR_RX_T2EXPDCN:        /*! Timer T2 expired while waiting for DCN */
00243    case T30_ERR_RX_T2EXPD:          /*! Timer T2 expired while waiting for phase D */
00244    case T30_ERR_RX_T2EXPFAX:        /*! Timer T2 expired while waiting for fax page */
00245    case T30_ERR_RX_T2EXPMPS:        /*! Timer T2 expired while waiting for next fax page */
00246    case T30_ERR_RX_T2EXPRR:         /*! Timer T2 expired while waiting for RR command */
00247    case T30_ERR_RX_T2EXP:           /*! Timer T2 expired while waiting for NSS, DCS or MCF */
00248    case T30_ERR_RX_DCNWHY:          /*! Unexpected DCN while waiting for DCS or DIS */
00249    case T30_ERR_RX_DCNDATA:         /*! Unexpected DCN while waiting for image data */
00250    case T30_ERR_RX_DCNFAX:          /*! Unexpected DCN while waiting for EOM, EOP or MPS */
00251    case T30_ERR_RX_DCNPHD:          /*! Unexpected DCN after EOM or MPS sequence */
00252    case T30_ERR_RX_DCNRRD:          /*! Unexpected DCN after RR/RNR sequence */
00253    case T30_ERR_RX_DCNNORTN:        /*! Unexpected DCN after requested retransmission */
00254       ast_atomic_fetchadd_int(&p->stats->rx_protocol_error, 1);
00255       break;
00256 
00257    /* TIFF file problems */
00258    case T30_ERR_FILEERROR:          /*! TIFF/F file cannot be opened */
00259    case T30_ERR_NOPAGE:             /*! TIFF/F page not found */
00260    case T30_ERR_BADTIFF:            /*! TIFF/F format is not compatible */
00261    case T30_ERR_BADPAGE:            /*! TIFF/F page number tag missing */
00262    case T30_ERR_BADTAG:             /*! Incorrect values for TIFF/F tags */
00263    case T30_ERR_BADTIFFHDR:         /*! Bad TIFF/F header - incorrect values in fields */
00264       ast_atomic_fetchadd_int(&p->stats->file_error, 1);
00265       break;
00266    case T30_ERR_NOMEM:              /*! Cannot allocate memory for more pages */
00267       ast_atomic_fetchadd_int(&p->stats->mem_error, 1);
00268       break;
00269 
00270    /* General problems */
00271    case T30_ERR_RETRYDCN:           /*! Disconnected after permitted retries */
00272       ast_atomic_fetchadd_int(&p->stats->retries_exceeded, 1);
00273       break;
00274    case T30_ERR_CALLDROPPED:        /*! The call dropped prematurely */
00275       ast_atomic_fetchadd_int(&p->stats->call_dropped, 1);
00276       break;
00277 
00278    /* Feature negotiation issues */
00279    case T30_ERR_NOPOLL:             /*! Poll not accepted */
00280    case T30_ERR_IDENT_UNACCEPTABLE: /*! Far end's ident is not acceptable */
00281    case T30_ERR_SUB_UNACCEPTABLE:   /*! Far end's sub-address is not acceptable */
00282    case T30_ERR_SEP_UNACCEPTABLE:   /*! Far end's selective polling address is not acceptable */
00283    case T30_ERR_PSA_UNACCEPTABLE:   /*! Far end's polled sub-address is not acceptable */
00284    case T30_ERR_SID_UNACCEPTABLE:   /*! Far end's sender identification is not acceptable */
00285    case T30_ERR_PWD_UNACCEPTABLE:   /*! Far end's password is not acceptable */
00286    case T30_ERR_TSA_UNACCEPTABLE:   /*! Far end's transmitting subscriber internet address is not acceptable */
00287    case T30_ERR_IRA_UNACCEPTABLE:   /*! Far end's internet routing address is not acceptable */
00288    case T30_ERR_CIA_UNACCEPTABLE:   /*! Far end's calling subscriber internet address is not acceptable */
00289    case T30_ERR_ISP_UNACCEPTABLE:   /*! Far end's internet selective polling address is not acceptable */
00290    case T30_ERR_CSA_UNACCEPTABLE:   /*! Far end's called subscriber internet address is not acceptable */
00291       ast_atomic_fetchadd_int(&p->stats->neg_failed, 1);
00292       break;
00293    default:
00294       ast_atomic_fetchadd_int(&p->stats->unknown_error, 1);
00295       ast_log(LOG_WARNING, "unknown FAX session result '%d' (%s)\n", completion_code, t30_completion_code_to_str(completion_code));
00296       return -1;
00297    }
00298    return 0;
00299 }


Variable Documentation

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "Spandsp G.711 and T.38 FAX Technologies" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = "ac1f6a56484a8820659555499174e588" , .load = load_module, .unload = unload_module, } [static]

Definition at line 800 of file res_fax_spandsp.c.

struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 800 of file res_fax_spandsp.c.

struct spandsp_fax_stats g711

Definition at line 111 of file res_fax_spandsp.c.

ast_mutex_t lock

Definition at line 110 of file res_fax_spandsp.c.

struct ast_fax_tech spandsp_fax_tech [static]

Definition at line 67 of file res_fax_spandsp.c.

Referenced by load_module(), and unload_module().

struct { ... } spandsp_global_stats [static]

struct spandsp_fax_stats t38

Definition at line 112 of file res_fax_spandsp.c.

Referenced by transmit_t38().


Generated on Mon Oct 8 12:39:27 2012 for Asterisk - The Open Source Telephony Project by  doxygen 1.4.7