Mon Mar 31 07:39:05 2008

Asterisk developer's documentation


audiohook.c File Reference

Audiohooks Architecture. More...

#include "asterisk.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <errno.h>
#include <unistd.h>
#include "asterisk/logger.h"
#include "asterisk/channel.h"
#include "asterisk/options.h"
#include "asterisk/utils.h"
#include "asterisk/lock.h"
#include "asterisk/linkedlists.h"
#include "asterisk/audiohook.h"
#include "asterisk/slinfactory.h"
#include "asterisk/frame.h"
#include "asterisk/translate.h"

Include dependency graph for audiohook.c:

Go to the source code of this file.

Data Structures

struct  ast_audiohook_list
struct  ast_audiohook_translate

Functions

int ast_audiohook_attach (struct ast_channel *chan, struct ast_audiohook *audiohook)
 Attach audiohook to channel.
int ast_audiohook_destroy (struct ast_audiohook *audiohook)
 Destroys an audiohook structure.
int ast_audiohook_detach (struct ast_audiohook *audiohook)
 Detach audiohook from channel.
int ast_audiohook_detach_list (struct ast_audiohook_list *audiohook_list)
 Detach audiohooks from list and destroy said list.
int ast_audiohook_detach_source (struct ast_channel *chan, const char *source)
 Detach specified source audiohook from channel.
int ast_audiohook_init (struct ast_audiohook *audiohook, enum ast_audiohook_type type, const char *source)
 Initialize an audiohook structure.
ast_frameast_audiohook_read_frame (struct ast_audiohook *audiohook, size_t samples, enum ast_audiohook_direction direction, int format)
 Reads a frame in from the audiohook structure.
void ast_audiohook_trigger_wait (struct ast_audiohook *audiohook)
 Wait for audiohook trigger to be triggered.
int ast_audiohook_write_frame (struct ast_audiohook *audiohook, enum ast_audiohook_direction direction, struct ast_frame *frame)
 Writes a frame into the audiohook structure.
ast_frameast_audiohook_write_list (struct ast_channel *chan, struct ast_audiohook_list *audiohook_list, enum ast_audiohook_direction direction, struct ast_frame *frame)
 Pass a frame off to be handled by the audiohook core.
static struct ast_frameaudio_audiohook_write_list (struct ast_channel *chan, struct ast_audiohook_list *audiohook_list, enum ast_audiohook_direction direction, struct ast_frame *frame)
 Pass an AUDIO frame off to be handled by the audiohook core.
static struct ast_frameaudiohook_read_frame_both (struct ast_audiohook *audiohook, size_t samples)
static struct ast_frameaudiohook_read_frame_single (struct ast_audiohook *audiohook, size_t samples, enum ast_audiohook_direction direction)
static struct ast_framedtmf_audiohook_write_list (struct ast_channel *chan, struct ast_audiohook_list *audiohook_list, enum ast_audiohook_direction direction, struct ast_frame *frame)
 Pass a DTMF frame off to be handled by the audiohook core.
static struct ast_audiohookfind_audiohook_by_source (struct ast_audiohook_list *audiohook_list, const char *source)


Detailed Description

Audiohooks Architecture.

Author:
Joshua Colp <jcolp@digium.com>

Definition in file audiohook.c.


Function Documentation

int ast_audiohook_attach ( struct ast_channel chan,
struct ast_audiohook audiohook 
)

Attach audiohook to channel.

Parameters:
chan Channel
audiohook Audiohook structure
Returns:
Returns 0 on success, -1 on failure

Definition at line 315 of file audiohook.c.

References AST_AUDIOHOOK_STATUS_RUNNING, AST_AUDIOHOOK_TYPE_MANIPULATE, AST_AUDIOHOOK_TYPE_SPY, AST_AUDIOHOOK_TYPE_WHISPER, ast_calloc, ast_channel_lock, ast_channel_unlock, AST_LIST_HEAD_INIT_NOLOCK, AST_LIST_INSERT_TAIL, ast_channel::audiohooks, ast_audiohook::status, and ast_audiohook::type.

Referenced by start_spying(), and startmon().

00316 {
00317    ast_channel_lock(chan);
00318 
00319    if (!chan->audiohooks) {
00320       /* Whoops... allocate a new structure */
00321       if (!(chan->audiohooks = ast_calloc(1, sizeof(*chan->audiohooks)))) {
00322          ast_channel_unlock(chan);
00323          return -1;
00324       }
00325       AST_LIST_HEAD_INIT_NOLOCK(&chan->audiohooks->spy_list);
00326       AST_LIST_HEAD_INIT_NOLOCK(&chan->audiohooks->whisper_list);
00327       AST_LIST_HEAD_INIT_NOLOCK(&chan->audiohooks->manipulate_list);
00328    }
00329 
00330    /* Drop into respective list */
00331    if (audiohook->type == AST_AUDIOHOOK_TYPE_SPY)
00332       AST_LIST_INSERT_TAIL(&chan->audiohooks->spy_list, audiohook, list);
00333    else if (audiohook->type == AST_AUDIOHOOK_TYPE_WHISPER)
00334       AST_LIST_INSERT_TAIL(&chan->audiohooks->whisper_list, audiohook, list);
00335    else if (audiohook->type == AST_AUDIOHOOK_TYPE_MANIPULATE)
00336       AST_LIST_INSERT_TAIL(&chan->audiohooks->manipulate_list, audiohook, list);
00337 
00338    /* Change status over to running since it is now attached */
00339    audiohook->status = AST_AUDIOHOOK_STATUS_RUNNING;
00340 
00341    ast_channel_unlock(chan);
00342 
00343    return 0;
00344 }

int ast_audiohook_destroy ( struct ast_audiohook audiohook  ) 

Destroys an audiohook structure.

Parameters:
audiohook Audiohook structure
Returns:
Returns 0 on success, -1 on failure

Definition at line 98 of file audiohook.c.

References AST_AUDIOHOOK_TYPE_SPY, AST_AUDIOHOOK_TYPE_WHISPER, ast_cond_destroy(), ast_mutex_destroy(), ast_slinfactory_destroy(), ast_translator_free_path(), ast_audiohook::lock, ast_audiohook::read_factory, ast_audiohook::trans_pvt, ast_audiohook::trigger, ast_audiohook::type, and ast_audiohook::write_factory.

Referenced by channel_spy(), launch_monitor_thread(), and mixmonitor_thread().

00099 {
00100    /* Drop the factories used by this audiohook type */
00101    switch (audiohook->type) {
00102    case AST_AUDIOHOOK_TYPE_SPY:
00103       ast_slinfactory_destroy(&audiohook->read_factory);
00104    case AST_AUDIOHOOK_TYPE_WHISPER:
00105       ast_slinfactory_destroy(&audiohook->write_factory);
00106       break;
00107    default:
00108       break;
00109    }
00110 
00111    /* Destroy translation path if present */
00112    if (audiohook->trans_pvt)
00113       ast_translator_free_path(audiohook->trans_pvt);
00114 
00115    /* Lock and trigger be gone! */
00116    ast_cond_destroy(&audiohook->trigger);
00117    ast_mutex_destroy(&audiohook->lock);
00118 
00119    return 0;
00120 }

int ast_audiohook_detach ( struct ast_audiohook audiohook  ) 

Detach audiohook from channel.

Parameters:
audiohook Audiohook structure
Returns:
Returns 0 on success, -1 on failure

Definition at line 350 of file audiohook.c.

References AST_AUDIOHOOK_STATUS_DONE, AST_AUDIOHOOK_STATUS_SHUTDOWN, ast_audiohook_trigger_wait(), and ast_audiohook::status.

Referenced by channel_spy(), and mixmonitor_thread().

00351 {
00352    if (audiohook->status == AST_AUDIOHOOK_STATUS_DONE)
00353       return 0;
00354 
00355    audiohook->status = AST_AUDIOHOOK_STATUS_SHUTDOWN;
00356 
00357    while (audiohook->status != AST_AUDIOHOOK_STATUS_DONE)
00358       ast_audiohook_trigger_wait(audiohook);
00359 
00360    return 0;
00361 }

int ast_audiohook_detach_list ( struct ast_audiohook_list audiohook_list  ) 

Detach audiohooks from list and destroy said list.

Parameters:
audiohook_list List of audiohooks
Returns:
Returns 0 on success, -1 on failure

Definition at line 367 of file audiohook.c.

References ast_audiohook_lock, AST_AUDIOHOOK_STATUS_DONE, ast_audiohook_unlock, ast_cond_signal(), ast_free, AST_LIST_REMOVE_CURRENT, AST_LIST_TRAVERSE_SAFE_BEGIN, AST_LIST_TRAVERSE_SAFE_END, ast_translator_free_path(), ast_audiohook_list::in_translate, ast_audiohook::manipulate_callback, ast_audiohook_list::out_translate, ast_audiohook::status, ast_audiohook_translate::trans_pvt, and ast_audiohook::trigger.

Referenced by ast_hangup().

00368 {
00369    int i = 0;
00370    struct ast_audiohook *audiohook = NULL;
00371 
00372    /* Drop any spies */
00373    AST_LIST_TRAVERSE_SAFE_BEGIN(&audiohook_list->spy_list, audiohook, list) {
00374       ast_audiohook_lock(audiohook);
00375       AST_LIST_REMOVE_CURRENT(&audiohook_list->spy_list, list);
00376       audiohook->status = AST_AUDIOHOOK_STATUS_DONE;
00377       ast_cond_signal(&audiohook->trigger);
00378       ast_audiohook_unlock(audiohook);
00379    }
00380    AST_LIST_TRAVERSE_SAFE_END
00381 
00382    /* Drop any whispering sources */
00383    AST_LIST_TRAVERSE_SAFE_BEGIN(&audiohook_list->whisper_list, audiohook, list) {
00384       ast_audiohook_lock(audiohook);
00385       AST_LIST_REMOVE_CURRENT(&audiohook_list->whisper_list, list);
00386       audiohook->status = AST_AUDIOHOOK_STATUS_DONE;
00387       ast_cond_signal(&audiohook->trigger);
00388       ast_audiohook_unlock(audiohook);
00389    }
00390    AST_LIST_TRAVERSE_SAFE_END
00391 
00392    /* Drop any manipulaters */
00393    AST_LIST_TRAVERSE_SAFE_BEGIN(&audiohook_list->manipulate_list, audiohook, list) {
00394       ast_audiohook_lock(audiohook);
00395       AST_LIST_REMOVE_CURRENT(&audiohook_list->manipulate_list, list);
00396       audiohook->status = AST_AUDIOHOOK_STATUS_DONE;
00397       ast_audiohook_unlock(audiohook);
00398       audiohook->manipulate_callback(audiohook, NULL, NULL, 0);
00399    }
00400    AST_LIST_TRAVERSE_SAFE_END
00401 
00402    /* Drop translation paths if present */
00403    for (i = 0; i < 2; i++) {
00404       if (audiohook_list->in_translate[i].trans_pvt)
00405          ast_translator_free_path(audiohook_list->in_translate[i].trans_pvt);
00406       if (audiohook_list->out_translate[i].trans_pvt)
00407          ast_translator_free_path(audiohook_list->out_translate[i].trans_pvt);
00408    }
00409    
00410    /* Free ourselves */
00411    ast_free(audiohook_list);
00412 
00413    return 0;
00414 }

int ast_audiohook_detach_source ( struct ast_channel chan,
const char *  source 
)

Detach specified source audiohook from channel.

Parameters:
chan Channel to detach from
source Name of source to detach
Returns:
Returns 0 on success, -1 on failure

Definition at line 443 of file audiohook.c.

References AST_AUDIOHOOK_STATUS_DONE, AST_AUDIOHOOK_STATUS_SHUTDOWN, ast_channel_lock, ast_channel_unlock, ast_channel::audiohooks, find_audiohook_by_source(), and ast_audiohook::status.

Referenced by mixmonitor_cli(), and stop_mixmonitor_exec().

00444 {
00445    struct ast_audiohook *audiohook = NULL;
00446 
00447    ast_channel_lock(chan);
00448 
00449    /* Ensure the channel has audiohooks on it */
00450    if (!chan->audiohooks) {
00451       ast_channel_unlock(chan);
00452       return -1;
00453    }
00454 
00455    audiohook = find_audiohook_by_source(chan->audiohooks, source);
00456 
00457    ast_channel_unlock(chan);
00458 
00459    if (audiohook && audiohook->status != AST_AUDIOHOOK_STATUS_DONE)
00460       audiohook->status = AST_AUDIOHOOK_STATUS_SHUTDOWN;
00461 
00462    return (audiohook ? 0 : -1);
00463 }

int ast_audiohook_init ( struct ast_audiohook audiohook,
enum ast_audiohook_type  type,
const char *  source 
)

Initialize an audiohook structure.

Parameters:
audiohook Audiohook structure
type 
source 
Returns:
Returns 0 on success, -1 on failure

Definition at line 67 of file audiohook.c.

References AST_AUDIOHOOK_STATUS_NEW, AST_AUDIOHOOK_TYPE_SPY, AST_AUDIOHOOK_TYPE_WHISPER, ast_cond_init(), ast_mutex_init(), and ast_slinfactory_init().

Referenced by channel_spy(), and launch_monitor_thread().

00068 {
00069    /* Need to keep the type and source */
00070    audiohook->type = type;
00071    audiohook->source = source;
00072 
00073    /* Initialize lock that protects our audiohook */
00074    ast_mutex_init(&audiohook->lock);
00075    ast_cond_init(&audiohook->trigger, NULL);
00076 
00077    /* Setup the factories that are needed for this audiohook type */
00078    switch (type) {
00079    case AST_AUDIOHOOK_TYPE_SPY:
00080       ast_slinfactory_init(&audiohook->read_factory);
00081    case AST_AUDIOHOOK_TYPE_WHISPER:
00082       ast_slinfactory_init(&audiohook->write_factory);
00083       break;
00084    default:
00085       break;
00086    }
00087 
00088    /* Since we are just starting out... this audiohook is new */
00089    audiohook->status = AST_AUDIOHOOK_STATUS_NEW;
00090 
00091    return 0;
00092 }

struct ast_frame* ast_audiohook_read_frame ( struct ast_audiohook audiohook,
size_t  samples,
enum ast_audiohook_direction  direction,
int  format 
)

Reads a frame in from the audiohook structure.

Parameters:
audiohook Audiohook structure
samples Number of samples wanted
direction Direction the audio frame came from
format Format of frame remote side wants back
Returns:
Returns frame on success, NULL on failure

Definition at line 280 of file audiohook.c.

References AST_AUDIOHOOK_DIRECTION_BOTH, AST_FORMAT_SLINEAR, ast_frfree, ast_translate(), ast_translator_build_path(), ast_translator_free_path(), audiohook_read_frame_both(), and audiohook_read_frame_single().

Referenced by mixmonitor_thread(), and spy_generate().

00281 {
00282    struct ast_frame *read_frame = NULL, *final_frame = NULL;
00283 
00284    if (!(read_frame = (direction == AST_AUDIOHOOK_DIRECTION_BOTH ? audiohook_read_frame_both(audiohook, samples) : audiohook_read_frame_single(audiohook, samples, direction))))
00285       return NULL;
00286 
00287    /* If they don't want signed linear back out, we'll have to send it through the translation path */
00288    if (format != AST_FORMAT_SLINEAR) {
00289       /* Rebuild translation path if different format then previously */
00290       if (audiohook->format != format) {
00291          if (audiohook->trans_pvt) {
00292             ast_translator_free_path(audiohook->trans_pvt);
00293             audiohook->trans_pvt = NULL;
00294          }
00295          /* Setup new translation path for this format... if we fail we can't very well return signed linear so free the frame and return nothing */
00296          if (!(audiohook->trans_pvt = ast_translator_build_path(format, AST_FORMAT_SLINEAR))) {
00297             ast_frfree(read_frame);
00298             return NULL;
00299          }
00300       }
00301       /* Convert to requested format, and allow the read in frame to be freed */
00302       final_frame = ast_translate(audiohook->trans_pvt, read_frame, 1);
00303    } else {
00304       final_frame = read_frame;
00305    }
00306 
00307    return final_frame;
00308 }

void ast_audiohook_trigger_wait ( struct ast_audiohook audiohook  ) 

Wait for audiohook trigger to be triggered.

Parameters:
audiohook Audiohook to wait on

Definition at line 638 of file audiohook.c.

References ast_cond_timedwait(), ast_tvadd(), ast_audiohook::lock, and ast_audiohook::trigger.

Referenced by ast_audiohook_detach(), and mixmonitor_thread().

00639 {
00640    struct timeval tv;
00641    struct timespec ts;
00642 
00643    tv = ast_tvadd(ast_tvnow(), ast_samp2tv(50000, 1000));
00644    ts.tv_sec = tv.tv_sec;
00645    ts.tv_nsec = tv.tv_usec * 1000;
00646    
00647    ast_cond_timedwait(&audiohook->trigger, &audiohook->lock, &ts);
00648    
00649    return;
00650 }

int ast_audiohook_write_frame ( struct ast_audiohook audiohook,
enum ast_audiohook_direction  direction,
struct ast_frame frame 
)

Writes a frame into the audiohook structure.

Parameters:
audiohook Audiohook structure
direction Direction the audio frame came from
frame Frame to write in
Returns:
Returns 0 on success, -1 on failure

Definition at line 128 of file audiohook.c.

References AST_AUDIOHOOK_DIRECTION_READ, AST_AUDIOHOOK_DIRECTION_WRITE, AST_AUDIOHOOK_TRIGGER_MODE, AST_AUDIOHOOK_TRIGGER_READ, AST_AUDIOHOOK_TRIGGER_SYNC, AST_AUDIOHOOK_TRIGGER_WRITE, ast_cond_signal(), ast_slinfactory_feed(), ast_test_flag, ast_audiohook::read_factory, ast_audiohook::read_time, ast_audiohook::trigger, ast_audiohook::write_factory, and ast_audiohook::write_time.

Referenced by audio_audiohook_write_list(), and channel_spy().

00129 {
00130    struct ast_slinfactory *factory = (direction == AST_AUDIOHOOK_DIRECTION_READ ? &audiohook->read_factory : &audiohook->write_factory);
00131    struct timeval *time = (direction == AST_AUDIOHOOK_DIRECTION_READ ? &audiohook->read_time : &audiohook->write_time);
00132 
00133    /* Write frame out to respective factory */
00134    ast_slinfactory_feed(factory, frame);
00135 
00136    /* Update last fed time for the above factory */
00137    *time = ast_tvnow();
00138 
00139    /* If we need to notify the respective handler of this audiohook, do so */
00140    if ((ast_test_flag(audiohook, AST_AUDIOHOOK_TRIGGER_MODE) == AST_AUDIOHOOK_TRIGGER_READ) && (direction == AST_AUDIOHOOK_DIRECTION_READ)) {
00141       ast_cond_signal(&audiohook->trigger);
00142    } else if ((ast_test_flag(audiohook, AST_AUDIOHOOK_TRIGGER_MODE) == AST_AUDIOHOOK_TRIGGER_WRITE) && (direction == AST_AUDIOHOOK_DIRECTION_WRITE)) {
00143       ast_cond_signal(&audiohook->trigger);
00144    } else if (ast_test_flag(audiohook, AST_AUDIOHOOK_TRIGGER_SYNC)) {
00145       ast_cond_signal(&audiohook->trigger);
00146    }
00147 
00148    return 0;
00149 }

struct ast_frame* ast_audiohook_write_list ( struct ast_channel chan,
struct ast_audiohook_list audiohook_list,
enum ast_audiohook_direction  direction,
struct ast_frame frame 
)

Pass a frame off to be handled by the audiohook core.

Parameters:
chan Channel that the list is coming off of
audiohook_list List of audiohooks
direction Direction frame is coming in from
frame The frame itself
Returns:
Return frame on success, NULL on failure

Definition at line 623 of file audiohook.c.

References AST_FRAME_DTMF, AST_FRAME_VOICE, audio_audiohook_write_list(), dtmf_audiohook_write_list(), and ast_frame::frametype.

Referenced by __ast_read(), and ast_write().

00624 {
00625    /* Pass off frame to it's respective list write function */
00626    if (frame->frametype == AST_FRAME_VOICE)
00627       return audio_audiohook_write_list(chan, audiohook_list, direction, frame);
00628    else if (frame->frametype == AST_FRAME_DTMF)
00629       return dtmf_audiohook_write_list(chan, audiohook_list, direction, frame);
00630    else
00631       return frame;
00632 }

static struct ast_frame* audio_audiohook_write_list ( struct ast_channel chan,
struct ast_audiohook_list audiohook_list,
enum ast_audiohook_direction  direction,
struct ast_frame frame 
) [static]

Pass an AUDIO frame off to be handled by the audiohook core.

Parameters:
chan Channel that the list is coming off of
audiohook_list List of audiohooks
direction Direction frame is coming in from
frame The frame itself
Returns:
Return frame on success, NULL on failure

Definition at line 501 of file audiohook.c.

References AST_AUDIOHOOK_DIRECTION_READ, AST_AUDIOHOOK_DIRECTION_WRITE, ast_audiohook_lock, AST_AUDIOHOOK_STATUS_DONE, AST_AUDIOHOOK_STATUS_RUNNING, ast_audiohook_unlock, ast_audiohook_write_frame(), ast_cond_signal(), AST_FORMAT_SLINEAR, ast_frfree, AST_LIST_EMPTY, AST_LIST_REMOVE_CURRENT, AST_LIST_TRAVERSE_SAFE_BEGIN, AST_LIST_TRAVERSE_SAFE_END, ast_slinear_saturated_add(), ast_slinfactory_available(), ast_slinfactory_read(), ast_translate(), ast_translator_build_path(), ast_translator_free_path(), ast_audiohook_translate::format, ast_audiohook_list::in_translate, ast_audiohook::manipulate_callback, ast_audiohook_list::out_translate, ast_frame::samples, ast_audiohook::status, ast_frame::subclass, ast_audiohook_translate::trans_pvt, ast_audiohook::trigger, and ast_audiohook::write_factory.

Referenced by ast_audiohook_write_list().

00502 {
00503    struct ast_audiohook_translate *in_translate = (direction == AST_AUDIOHOOK_DIRECTION_READ ? &audiohook_list->in_translate[0] : &audiohook_list->in_translate[1]);
00504    struct ast_audiohook_translate *out_translate = (direction == AST_AUDIOHOOK_DIRECTION_READ ? &audiohook_list->out_translate[0] : &audiohook_list->out_translate[1]);
00505    struct ast_frame *start_frame = frame, *middle_frame = frame, *end_frame = frame;
00506    struct ast_audiohook *audiohook = NULL;
00507    int samples = frame->samples;
00508    
00509    /* If the frame coming in is not signed linear we have to send it through the in_translate path */
00510    if (frame->subclass != AST_FORMAT_SLINEAR) {
00511       if (in_translate->format != frame->subclass) {
00512          if (in_translate->trans_pvt)
00513             ast_translator_free_path(in_translate->trans_pvt);
00514          if (!(in_translate->trans_pvt = ast_translator_build_path(AST_FORMAT_SLINEAR, frame->subclass)))
00515             return frame;
00516          in_translate->format = frame->subclass;
00517       }
00518       if (!(middle_frame = ast_translate(in_translate->trans_pvt, frame, 0)))
00519          return frame;
00520    }
00521 
00522    /* Queue up signed linear frame to each spy */
00523    AST_LIST_TRAVERSE_SAFE_BEGIN(&audiohook_list->spy_list, audiohook, list) {
00524       ast_audiohook_lock(audiohook);
00525       if (audiohook->status != AST_AUDIOHOOK_STATUS_RUNNING) {
00526          AST_LIST_REMOVE_CURRENT(&audiohook_list->spy_list, list);
00527          audiohook->status = AST_AUDIOHOOK_STATUS_DONE;
00528          ast_cond_signal(&audiohook->trigger);
00529          ast_audiohook_unlock(audiohook);
00530          continue;
00531       }
00532       ast_audiohook_write_frame(audiohook, direction, middle_frame);
00533       ast_audiohook_unlock(audiohook);
00534    }
00535    AST_LIST_TRAVERSE_SAFE_END
00536 
00537    /* If this frame is being written out to the channel then we need to use whisper sources */
00538    if (direction == AST_AUDIOHOOK_DIRECTION_WRITE && !AST_LIST_EMPTY(&audiohook_list->whisper_list)) {
00539       int i = 0;
00540       short read_buf[samples], combine_buf[samples], *data1 = NULL, *data2 = NULL;
00541       memset(&combine_buf, 0, sizeof(combine_buf));
00542       AST_LIST_TRAVERSE_SAFE_BEGIN(&audiohook_list->whisper_list, audiohook, list) {
00543          ast_audiohook_lock(audiohook);
00544          if (audiohook->status != AST_AUDIOHOOK_STATUS_RUNNING) {
00545             AST_LIST_REMOVE_CURRENT(&audiohook_list->whisper_list, list);
00546             audiohook->status = AST_AUDIOHOOK_STATUS_DONE;
00547             ast_cond_signal(&audiohook->trigger);
00548             ast_audiohook_unlock(audiohook);
00549             continue;
00550          }
00551          if (ast_slinfactory_available(&audiohook->write_factory) >= samples && ast_slinfactory_read(&audiohook->write_factory, read_buf, samples)) {
00552             /* Take audio from this whisper source and combine it into our main buffer */
00553             for (i = 0, data1 = combine_buf, data2 = read_buf; i < samples; i++, data1++, data2++)
00554                ast_slinear_saturated_add(data1, data2);
00555          }
00556          ast_audiohook_unlock(audiohook);
00557       }
00558       AST_LIST_TRAVERSE_SAFE_END
00559       /* We take all of the combined whisper sources and combine them into the audio being written out */
00560       for (i = 0, data1 = middle_frame->data, data2 = combine_buf; i < samples; i++, data1++, data2++)
00561          ast_slinear_saturated_add(data1, data2);
00562       end_frame = middle_frame;
00563    }
00564 
00565    /* Pass off frame to manipulate audiohooks */
00566    if (!AST_LIST_EMPTY(&audiohook_list->manipulate_list)) {
00567       AST_LIST_TRAVERSE_SAFE_BEGIN(&audiohook_list->manipulate_list, audiohook, list) {
00568          ast_audiohook_lock(audiohook);
00569          if (audiohook->status != AST_AUDIOHOOK_STATUS_RUNNING) {
00570             AST_LIST_REMOVE_CURRENT(&audiohook_list->manipulate_list, list);
00571             audiohook->status = AST_AUDIOHOOK_STATUS_DONE;
00572             ast_audiohook_unlock(audiohook);
00573             /* We basically drop all of our links to the manipulate audiohook and prod it to do it's own destructive things */
00574             audiohook->manipulate_callback(audiohook, chan, NULL, direction);
00575             continue;
00576          }
00577          /* Feed in frame to manipulation */
00578          audiohook->manipulate_callback(audiohook, chan, middle_frame, direction);
00579          ast_audiohook_unlock(audiohook);
00580       }
00581       AST_LIST_TRAVERSE_SAFE_END
00582       end_frame = middle_frame;
00583    }
00584 
00585    /* Now we figure out what to do with our end frame (whether to transcode or not) */
00586    if (middle_frame == end_frame) {
00587       /* Middle frame was modified and became the end frame... let's see if we need to transcode */
00588       if (end_frame->subclass != start_frame->subclass) {
00589          if (out_translate->format != start_frame->subclass) {
00590             if (out_translate->trans_pvt)
00591                ast_translator_free_path(out_translate->trans_pvt);
00592             if (!(out_translate->trans_pvt = ast_translator_build_path(start_frame->subclass, AST_FORMAT_SLINEAR))) {
00593                /* We can't transcode this... drop our middle frame and return the original */
00594                ast_frfree(middle_frame);
00595                return start_frame;
00596             }
00597             out_translate->format = start_frame->subclass;
00598          }
00599          /* Transcode from our middle (signed linear) frame to new format of the frame that came in */
00600          if (!(end_frame = ast_translate(out_translate->trans_pvt, middle_frame, 0))) {
00601             /* Failed to transcode the frame... drop it and return the original */
00602             ast_frfree(middle_frame);
00603             return start_frame;
00604          }
00605          /* Here's the scoop... middle frame is no longer of use to us */
00606          ast_frfree(middle_frame);
00607       }
00608    } else {
00609       /* No frame was modified, we can just drop our middle frame and pass the frame we got in out */
00610       ast_frfree(middle_frame);
00611    }
00612 
00613    return end_frame;
00614 }

static struct ast_frame* audiohook_read_frame_both ( struct ast_audiohook audiohook,
size_t  samples 
) [static]

Definition at line 179 of file audiohook.c.

References AST_FORMAT_SLINEAR, AST_FRAME_VOICE, ast_log(), ast_slinear_saturated_divide(), ast_slinear_saturated_multiply(), ast_slinfactory_available(), ast_slinfactory_read(), ast_frame::frametype, LOG_DEBUG, option_debug, ast_audiohook::options, ast_audiohook::read_factory, ast_audiohook_options::read_volume, ast_audiohook::write_factory, ast_audiohook::write_time, and ast_audiohook_options::write_volume.

Referenced by ast_audiohook_read_frame().

00180 {
00181    int i = 0, usable_read, usable_write;
00182    short buf1[samples], buf2[samples], *read_buf = NULL, *write_buf = NULL, *final_buf = NULL, *data1 = NULL, *data2 = NULL;
00183    struct ast_frame frame = {
00184       .frametype = AST_FRAME_VOICE,
00185       .subclass = AST_FORMAT_SLINEAR,
00186       .data = NULL,
00187       .datalen = sizeof(buf1),
00188       .samples = samples,
00189    };
00190 
00191    /* Make sure both factories have the required samples */
00192    usable_read = (ast_slinfactory_available(&audiohook->read_factory) >= samples ? 1 : 0);
00193    usable_write = (ast_slinfactory_available(&audiohook->write_factory) >= samples ? 1 : 0);
00194 
00195    if (!usable_read && !usable_write) {
00196       /* If both factories are unusable bail out */
00197       if (option_debug)
00198          ast_log(LOG_DEBUG, "Read factory %p and write factory %p both fail to provide %zd samples\n", &audiohook->read_factory, &audiohook->write_factory, samples);
00199       return NULL;
00200    }
00201 
00202    /* If we want to provide only a read factory make sure we aren't waiting for other audio */
00203    if (usable_read && !usable_write && (ast_tvdiff_ms(ast_tvnow(), audiohook->write_time) < (samples/8)*2)) {
00204       if (option_debug)
00205          ast_log(LOG_DEBUG, "Write factory %p was pretty quick last time, waiting for them.\n", &audiohook->write_factory);
00206       return NULL;
00207    }
00208 
00209    /* If we want to provide only a write factory make sure we aren't waiting for other audio */
00210    if (usable_write && !usable_read && (ast_tvdiff_ms(ast_tvnow(), audiohook->write_time) < (samples/8)*2)) {
00211       if (option_debug)
00212          ast_log(LOG_DEBUG, "Read factory %p was pretty quick last time, waiting for them.\n", &audiohook->read_factory);
00213       return NULL;
00214    }
00215 
00216    /* Start with the read factory... if there are enough samples, read them in */
00217    if (usable_read && ast_slinfactory_available(&audiohook->read_factory) >= samples) {
00218       if (ast_slinfactory_read(&audiohook->read_factory, buf1, samples)) {
00219          read_buf = buf1;
00220          /* Adjust read volume if need be */
00221          if (audiohook->options.read_volume) {
00222             int count = 0;
00223             short adjust_value = abs(audiohook->options.read_volume);
00224             for (count = 0; count < samples; count++) {
00225                if (audiohook->options.read_volume > 0)
00226                   ast_slinear_saturated_multiply(&buf1[count], &adjust_value);
00227                else if (audiohook->options.read_volume < 0)
00228                   ast_slinear_saturated_divide(&buf1[count], &adjust_value);
00229             }
00230          }
00231       }
00232    } else if (option_debug)
00233       ast_log(LOG_DEBUG, "Failed to get %zd samples from read factory %p\n", samples, &audiohook->read_factory);
00234 
00235    /* Move on to the write factory... if there are enough samples, read them in */
00236    if (usable_write && ast_slinfactory_available(&audiohook->write_factory) >= samples) {
00237       if (ast_slinfactory_read(&audiohook->write_factory, buf2, samples)) {
00238          write_buf = buf2;
00239          /* Adjust write volume if need be */
00240          if (audiohook->options.write_volume) {
00241             int count = 0;
00242             short adjust_value = abs(audiohook->options.write_volume);
00243             for (count = 0; count < samples; count++) {
00244                if (audiohook->options.write_volume > 0)
00245                   ast_slinear_saturated_multiply(&buf2[count], &adjust_value);
00246                else if (audiohook->options.write_volume < 0)
00247                   ast_slinear_saturated_divide(&buf2[count], &adjust_value);
00248             }
00249          }
00250       }
00251    } else if (option_debug)
00252       ast_log(LOG_DEBUG, "Failed to get %zd samples from write factory %p\n", samples, &audiohook->write_factory);
00253 
00254    /* Basically we figure out which buffer to use... and if mixing can be done here */
00255    if (!read_buf && !write_buf)
00256       return NULL;
00257    else if (read_buf && write_buf) {
00258       for (i = 0, data1 = read_buf, data2 = write_buf; i < samples; i++, data1++, data2++)
00259          ast_slinear_saturated_add(data1, data2);
00260       final_buf = buf1;
00261    } else if (read_buf)
00262       final_buf = buf1;
00263    else if (write_buf)
00264       final_buf = buf2;
00265 
00266    /* Make the final buffer part of the frame, so it gets duplicated fine */
00267    frame.data = final_buf;
00268 
00269    /* Yahoo, a combined copy of the audio! */
00270    return ast_frdup(&frame);
00271 }

static struct ast_frame* audiohook_read_frame_single ( struct ast_audiohook audiohook,
size_t  samples,
enum ast_audiohook_direction  direction 
) [static]

Definition at line 151 of file audiohook.c.

References AST_AUDIOHOOK_DIRECTION_READ, AST_FORMAT_SLINEAR, ast_frame_adjust_volume(), AST_FRAME_VOICE, ast_frdup(), ast_slinfactory_available(), ast_slinfactory_read(), ast_frame::frametype, ast_audiohook::options, ast_audiohook::read_factory, ast_audiohook_options::read_volume, ast_audiohook::write_factory, and ast_audiohook_options::write_volume.

Referenced by ast_audiohook_read_frame().

00152 {
00153    struct ast_slinfactory *factory = (direction == AST_AUDIOHOOK_DIRECTION_READ ? &audiohook->read_factory : &audiohook->write_factory);
00154    int vol = (direction == AST_AUDIOHOOK_DIRECTION_READ ? audiohook->options.read_volume : audiohook->options.write_volume);
00155    short buf[samples];
00156    struct ast_frame frame = {
00157       .frametype = AST_FRAME_VOICE,
00158       .subclass = AST_FORMAT_SLINEAR,
00159       .data = buf,
00160       .datalen = sizeof(buf),
00161       .samples = samples,
00162    };
00163 
00164    /* Ensure the factory is able to give us the samples we want */
00165    if (samples > ast_slinfactory_available(factory))
00166       return NULL;
00167    
00168    /* Read data in from factory */
00169    if (!ast_slinfactory_read(factory, buf, samples))
00170       return NULL;
00171 
00172    /* If a volume adjustment needs to be applied apply it */
00173    if (vol)
00174       ast_frame_adjust_volume(&frame, vol);
00175 
00176    return ast_frdup(&frame);
00177 }

static struct ast_frame* dtmf_audiohook_write_list ( struct ast_channel chan,
struct ast_audiohook_list audiohook_list,
enum ast_audiohook_direction  direction,
struct ast_frame frame 
) [static]

Pass a DTMF frame off to be handled by the audiohook core.

Parameters:
chan Channel that the list is coming off of
audiohook_list List of audiohooks
direction Direction frame is coming in from
frame The frame itself
Returns:
Return frame on success, NULL on failure

Definition at line 472 of file audiohook.c.

References ast_audiohook_lock, AST_AUDIOHOOK_STATUS_DONE, AST_AUDIOHOOK_STATUS_RUNNING, ast_audiohook_unlock, AST_AUDIOHOOK_WANTS_DTMF, AST_LIST_REMOVE_CURRENT, AST_LIST_TRAVERSE_SAFE_BEGIN, AST_LIST_TRAVERSE_SAFE_END, ast_test_flag, ast_audiohook::manipulate_callback, and ast_audiohook::status.

Referenced by ast_audiohook_write_list().

00473 {
00474    struct ast_audiohook *audiohook = NULL;
00475 
00476    AST_LIST_TRAVERSE_SAFE_BEGIN(&audiohook_list->manipulate_list, audiohook, list) {
00477       ast_audiohook_lock(audiohook);
00478       if (audiohook->status != AST_AUDIOHOOK_STATUS_RUNNING) {
00479          AST_LIST_REMOVE_CURRENT(&audiohook_list->manipulate_list, list);
00480          audiohook->status = AST_AUDIOHOOK_STATUS_DONE;
00481          ast_audiohook_unlock(audiohook);
00482          audiohook->manipulate_callback(audiohook, NULL, NULL, 0);
00483          continue;
00484       }
00485       if (ast_test_flag(audiohook, AST_AUDIOHOOK_WANTS_DTMF))
00486          audiohook->manipulate_callback(audiohook, chan, frame, direction);
00487       ast_audiohook_unlock(audiohook);
00488    }
00489    AST_LIST_TRAVERSE_SAFE_END
00490 
00491    return frame;
00492 }

static struct ast_audiohook* find_audiohook_by_source ( struct ast_audiohook_list audiohook_list,
const char *  source 
) [static]

Definition at line 416 of file audiohook.c.

References AST_LIST_TRAVERSE, and ast_audiohook::source.

Referenced by ast_audiohook_detach_source().

00417 {
00418    struct ast_audiohook *audiohook = NULL;
00419 
00420    AST_LIST_TRAVERSE(&audiohook_list->spy_list, audiohook, list) {
00421       if (!strcasecmp(audiohook->source, source))
00422          return audiohook;
00423    }
00424 
00425    AST_LIST_TRAVERSE(&audiohook_list->whisper_list, audiohook, list) {
00426       if (!strcasecmp(audiohook->source, source))
00427          return audiohook;
00428    }
00429 
00430    AST_LIST_TRAVERSE(&audiohook_list->manipulate_list, audiohook, list) {
00431       if (!strcasecmp(audiohook->source, source))
00432          return audiohook;
00433    }
00434 
00435    return NULL;
00436 }


Generated on Mon Mar 31 07:39:06 2008 for Asterisk - the Open Source PBX by  doxygen 1.5.1