Thu Feb 5 16:26:14 2009

Asterisk developer's documentation


frame.c File Reference

Frame and codec manipulation routines. More...

#include "asterisk.h"
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <stdio.h>
#include "asterisk/lock.h"
#include "asterisk/frame.h"
#include "asterisk/logger.h"
#include "asterisk/options.h"
#include "asterisk/channel.h"
#include "asterisk/cli.h"
#include "asterisk/term.h"
#include "asterisk/utils.h"
#include "asterisk/threadstorage.h"
#include "asterisk/linkedlists.h"
#include "asterisk/translate.h"
#include "asterisk/dsp.h"
#include "asterisk/file.h"

Go to the source code of this file.

Data Structures

struct  ast_codec_alias_table
struct  ast_frame_cache
struct  ast_frames
 This is just so ast_frames, a list head struct for holding a list of ast_frame structures, is defined. More...
struct  ast_smoother

Defines

#define FRAME_CACHE_MAX_SIZE   10
 Maximum ast_frame cache size.
#define SMOOTHER_SIZE   8000
#define TYPE_MASK   0x3

Enumerations

enum  frame_type { TYPE_HIGH, TYPE_LOW, TYPE_SILENCE, TYPE_DONTSEND }

Functions

int __ast_smoother_feed (struct ast_smoother *s, struct ast_frame *f, int swap)
char * ast_codec2str (int codec)
 Get a name from a format Gets a name from a format.
int ast_codec_choose (struct ast_codec_pref *pref, int formats, int find_best)
 Select the best audio format according to preference list from supplied options. If "find_best" is non-zero then if nothing is found, the "Best" format of the format list is selected, otherwise 0 is returned.
int ast_codec_get_len (int format, int samples)
 Returns the number of bytes for the number of samples of the given format.
int ast_codec_get_samples (struct ast_frame *f)
 Returns the number of samples contained in the frame.
int ast_codec_pref_append (struct ast_codec_pref *pref, int format)
 Append a audio codec to a preference list, removing it first if it was already there.
void ast_codec_pref_convert (struct ast_codec_pref *pref, char *buf, size_t size, int right)
 Shift an audio codec preference list up or down 65 bytes so that it becomes an ASCII string.
ast_format_list ast_codec_pref_getsize (struct ast_codec_pref *pref, int format)
 Get packet size for codec.
int ast_codec_pref_index (struct ast_codec_pref *pref, int index)
 Codec located at a particular place in the preference index See Audio Codec Preferences.
void ast_codec_pref_prepend (struct ast_codec_pref *pref, int format, int only_if_existing)
 Prepend an audio codec to a preference list, removing it first if it was already there.
void ast_codec_pref_remove (struct ast_codec_pref *pref, int format)
 Remove audio a codec from a preference list.
int ast_codec_pref_setsize (struct ast_codec_pref *pref, int format, int framems)
 Set packet size for codec.
int ast_codec_pref_string (struct ast_codec_pref *pref, char *buf, size_t size)
 Dump audio codec preference list into a string.
static const char * ast_expand_codec_alias (const char *in)
int ast_frame_adjust_volume (struct ast_frame *f, int adjustment)
 Adjusts the volume of the audio samples contained in a frame.
void ast_frame_dump (const char *name, struct ast_frame *f, char *prefix)
void ast_frame_free (struct ast_frame *fr, int cache)
 Requests a frame to be allocated Frees a frame.
static struct ast_frameast_frame_header_new (void)
int ast_frame_slinear_sum (struct ast_frame *f1, struct ast_frame *f2)
 Sums two frames of audio samples.
ast_frameast_frdup (const struct ast_frame *f)
 Copies a frame.
ast_frameast_frisolate (struct ast_frame *fr)
 Makes a frame independent of any static storage.
ast_format_listast_get_format_list (size_t *size)
ast_format_listast_get_format_list_index (int index)
int ast_getformatbyname (const char *name)
 Gets a format from a name.
char * ast_getformatname (int format)
 Get the name of a format.
char * ast_getformatname_multiple (char *buf, size_t size, int format)
 Get the names of a set of formats.
void ast_parse_allow_disallow (struct ast_codec_pref *pref, int *mask, const char *list, int allowing)
 Parse an "allow" or "deny" line in a channel or device configuration and update the capabilities mask and pref if provided. Video codecs are not added to codec preference lists, since we can not transcode.
void ast_smoother_free (struct ast_smoother *s)
int ast_smoother_get_flags (struct ast_smoother *s)
ast_smootherast_smoother_new (int size)
ast_frameast_smoother_read (struct ast_smoother *s)
void ast_smoother_reset (struct ast_smoother *s, int size)
void ast_smoother_set_flags (struct ast_smoother *s, int flags)
int ast_smoother_test_flag (struct ast_smoother *s, int flag)
void ast_swapcopy_samples (void *dst, const void *src, int samples)
static void frame_cache_cleanup (void *data)
static void frame_cache_init (void)
 A per-thread cache of frame headers.
static int g723_len (unsigned char buf)
static int g723_samples (unsigned char *buf, int maxlen)
static unsigned char get_n_bits_at (unsigned char *data, int n, int bit)
int init_framer (void)
static int show_codec_n (int fd, int argc, char *argv[])
static int show_codec_n_deprecated (int fd, int argc, char *argv[])
static int show_codecs (int fd, int argc, char *argv[])
static int show_codecs_deprecated (int fd, int argc, char *argv[])
static int speex_get_wb_sz_at (unsigned char *data, int len, int bit)
static int speex_samples (unsigned char *data, int len)

Variables

static struct ast_format_list AST_FORMAT_LIST []
 Definition of supported media formats (codecs).
ast_frame ast_null_frame = { AST_FRAME_NULL, }
static struct ast_cli_entry cli_show_audio_codecs
static struct ast_cli_entry cli_show_codec
static struct ast_cli_entry cli_show_codecs
static struct ast_cli_entry cli_show_image_codecs
static struct ast_cli_entry cli_show_video_codecs
static struct ast_threadstorage frame_cache = { .once = PTHREAD_ONCE_INIT , .key_init = frame_cache_init , }
static char frame_show_codec_n_usage []
static char frame_show_codecs_usage []
static struct ast_cli_entry my_clis []


Detailed Description

Frame and codec manipulation routines.

Author:
Mark Spencer <markster@digium.com>

Definition in file frame.c.


Define Documentation

#define FRAME_CACHE_MAX_SIZE   10

Maximum ast_frame cache size.

In most cases where the frame header cache will be useful, the size of the cache will stay very small. However, it is not always the case that the same thread that allocates the frame will be the one freeing them, so sometimes a thread will never have any frames in its cache, or the cache will never be pulled from. For the latter case, we limit the maximum size.

Definition at line 70 of file frame.c.

Referenced by ast_frame_free(), and iax_frame_free().

#define SMOOTHER_SIZE   8000

Definition at line 82 of file frame.c.

Referenced by __ast_smoother_feed().

#define TYPE_MASK   0x3

Definition at line 91 of file frame.c.

Referenced by g723_len().


Enumeration Type Documentation

enum frame_type

Enumerator:
TYPE_HIGH 
TYPE_LOW 
TYPE_SILENCE 
TYPE_DONTSEND 

Definition at line 84 of file frame.c.

00084                 {
00085    TYPE_HIGH,     /* 0x0 */
00086    TYPE_LOW,      /* 0x1 */
00087    TYPE_SILENCE,  /* 0x2 */
00088    TYPE_DONTSEND  /* 0x3 */
00089 };


Function Documentation

int __ast_smoother_feed ( struct ast_smoother s,
struct ast_frame f,
int  swap 
)

Definition at line 173 of file frame.c.

References AST_FRAME_VOICE, ast_log(), AST_MIN_OFFSET, AST_SMOOTHER_FLAG_G729, ast_swapcopy_samples(), ast_tvzero(), f, LOG_NOTICE, LOG_WARNING, s, and SMOOTHER_SIZE.

00174 {
00175    if (f->frametype != AST_FRAME_VOICE) {
00176       ast_log(LOG_WARNING, "Huh?  Can't smooth a non-voice frame!\n");
00177       return -1;
00178    }
00179    if (!s->format) {
00180       s->format = f->subclass;
00181       s->samplesperbyte = (float)f->samples / (float)f->datalen;
00182    } else if (s->format != f->subclass) {
00183       ast_log(LOG_WARNING, "Smoother was working on %d format frames, now trying to feed %d?\n", s->format, f->subclass);
00184       return -1;
00185    }
00186    if (s->len + f->datalen > SMOOTHER_SIZE) {
00187       ast_log(LOG_WARNING, "Out of smoother space\n");
00188       return -1;
00189    }
00190    if (((f->datalen == s->size) || ((f->datalen < 10) && (s->flags & AST_SMOOTHER_FLAG_G729)))
00191              && !s->opt && (f->offset >= AST_MIN_OFFSET)) {
00192       if (!s->len) {
00193          /* Optimize by sending the frame we just got
00194             on the next read, thus eliminating the douple
00195             copy */
00196          if (swap)
00197             ast_swapcopy_samples(f->data, f->data, f->samples);
00198          s->opt = f;
00199          return 0;
00200       }
00201    }
00202    if (s->flags & AST_SMOOTHER_FLAG_G729) {
00203       if (s->len % 10) {
00204          ast_log(LOG_NOTICE, "Dropping extra frame of G.729 since we already have a VAD frame at the end\n");
00205          return 0;
00206       }
00207    }
00208    if (swap)
00209       ast_swapcopy_samples(s->data+s->len, f->data, f->samples);
00210    else
00211       memcpy(s->data + s->len, f->data, f->datalen);
00212    /* If either side is empty, reset the delivery time */
00213    if (!s->len || ast_tvzero(f->delivery) || ast_tvzero(s->delivery))   /* XXX really ? */
00214       s->delivery = f->delivery;
00215    s->len += f->datalen;
00216    return 0;
00217 }

char* ast_codec2str ( int  codec  ) 

Get a name from a format Gets a name from a format.

Parameters:
codec codec number (1,2,4,8,16,etc.)
Returns:
This returns a static string identifying the format on success, 0 on error.

Definition at line 607 of file frame.c.

References AST_FORMAT_LIST, and desc.

Referenced by moh_alloc(), show_codec_n(), show_codec_n_deprecated(), show_codecs(), and show_codecs_deprecated().

00608 {
00609    int x;
00610    char *ret = "unknown";
00611    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
00612       if(AST_FORMAT_LIST[x].visible && AST_FORMAT_LIST[x].bits == codec) {
00613          ret = AST_FORMAT_LIST[x].desc;
00614          break;
00615       }
00616    }
00617    return ret;
00618 }

int ast_codec_choose ( struct ast_codec_pref pref,
int  formats,
int  find_best 
)

Select the best audio format according to preference list from supplied options. If "find_best" is non-zero then if nothing is found, the "Best" format of the format list is selected, otherwise 0 is returned.

Definition at line 1282 of file frame.c.

References ast_best_codec(), AST_FORMAT_AUDIO_MASK, AST_FORMAT_LIST, ast_log(), ast_format_list::bits, LOG_DEBUG, option_debug, and ast_codec_pref::order.

Referenced by __oh323_new(), gtalk_new(), process_sdp(), sip_new(), and socket_process().

01283 {
01284    int x, ret = 0, slot;
01285 
01286    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01287       slot = pref->order[x];
01288 
01289       if (!slot)
01290          break;
01291       if (formats & AST_FORMAT_LIST[slot-1].bits) {
01292          ret = AST_FORMAT_LIST[slot-1].bits;
01293          break;
01294       }
01295    }
01296    if(ret & AST_FORMAT_AUDIO_MASK)
01297       return ret;
01298 
01299    if (option_debug > 3)
01300       ast_log(LOG_DEBUG, "Could not find preferred codec - %s\n", find_best ? "Going for the best codec" : "Returning zero codec");
01301 
01302       return find_best ? ast_best_codec(formats) : 0;
01303 }

int ast_codec_get_len ( int  format,
int  samples 
)

Returns the number of bytes for the number of samples of the given format.

Definition at line 1541 of file frame.c.

References AST_FORMAT_ADPCM, AST_FORMAT_ALAW, AST_FORMAT_G722, AST_FORMAT_G726, AST_FORMAT_G726_AAL2, AST_FORMAT_G729A, AST_FORMAT_GSM, AST_FORMAT_ILBC, AST_FORMAT_SLINEAR, AST_FORMAT_ULAW, ast_getformatname(), ast_log(), len(), and LOG_WARNING.

Referenced by moh_generate(), and monmp3thread().

01542 {
01543    int len = 0;
01544 
01545    /* XXX Still need speex, g723, and lpc10 XXX */ 
01546    switch(format) {
01547    case AST_FORMAT_ILBC:
01548       len = (samples / 240) * 50;
01549       break;
01550    case AST_FORMAT_GSM:
01551       len = (samples / 160) * 33;
01552       break;
01553    case AST_FORMAT_G729A:
01554       len = samples / 8;
01555       break;
01556    case AST_FORMAT_SLINEAR:
01557       len = samples * 2;
01558       break;
01559    case AST_FORMAT_ULAW:
01560    case AST_FORMAT_ALAW:
01561       len = samples;
01562       break;
01563    case AST_FORMAT_G722:
01564    case AST_FORMAT_ADPCM:
01565    case AST_FORMAT_G726:
01566    case AST_FORMAT_G726_AAL2:
01567       len = samples / 2;
01568       break;
01569    default:
01570       ast_log(LOG_WARNING, "Unable to calculate sample length for format %s\n", ast_getformatname(format));
01571    }
01572 
01573    return len;
01574 }

int ast_codec_get_samples ( struct ast_frame f  ) 

Returns the number of samples contained in the frame.

Definition at line 1498 of file frame.c.

References AST_FORMAT_ADPCM, AST_FORMAT_ALAW, AST_FORMAT_G722, AST_FORMAT_G723_1, AST_FORMAT_G726, AST_FORMAT_G726_AAL2, AST_FORMAT_G729A, AST_FORMAT_GSM, AST_FORMAT_ILBC, AST_FORMAT_LPC10, AST_FORMAT_SLINEAR, AST_FORMAT_SPEEX, AST_FORMAT_ULAW, ast_getformatname(), ast_log(), f, g723_samples(), LOG_WARNING, and speex_samples().

Referenced by ast_rtp_read(), isAnsweringMachine(), moh_generate(), schedule_delivery(), and socket_process().

01499 {
01500    int samples=0;
01501    switch(f->subclass) {
01502    case AST_FORMAT_SPEEX:
01503       samples = speex_samples(f->data, f->datalen);
01504       break;
01505    case AST_FORMAT_G723_1:
01506                 samples = g723_samples(f->data, f->datalen);
01507       break;
01508    case AST_FORMAT_ILBC:
01509       samples = 240 * (f->datalen / 50);
01510       break;
01511    case AST_FORMAT_GSM:
01512       samples = 160 * (f->datalen / 33);
01513       break;
01514    case AST_FORMAT_G729A:
01515       samples = f->datalen * 8;
01516       break;
01517    case AST_FORMAT_SLINEAR:
01518       samples = f->datalen / 2;
01519       break;
01520    case AST_FORMAT_LPC10:
01521                 /* assumes that the RTP packet contains one LPC10 frame */
01522       samples = 22 * 8;
01523       samples += (((char *)(f->data))[7] & 0x1) * 8;
01524       break;
01525    case AST_FORMAT_ULAW:
01526    case AST_FORMAT_ALAW:
01527       samples = f->datalen;
01528       break;
01529    case AST_FORMAT_G722:
01530    case AST_FORMAT_ADPCM:
01531    case AST_FORMAT_G726:
01532    case AST_FORMAT_G726_AAL2:
01533       samples = f->datalen * 2;
01534       break;
01535    default:
01536       ast_log(LOG_WARNING, "Unable to calculate samples for format %s\n", ast_getformatname(f->subclass));
01537    }
01538    return samples;
01539 }

int ast_codec_pref_append ( struct ast_codec_pref pref,
int  format 
)

Append a audio codec to a preference list, removing it first if it was already there.

Definition at line 1141 of file frame.c.

References ast_codec_pref_remove(), AST_FORMAT_LIST, and ast_codec_pref::order.

Referenced by ast_parse_allow_disallow().

01142 {
01143    int x, newindex = 0;
01144 
01145    ast_codec_pref_remove(pref, format);
01146 
01147    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01148       if(AST_FORMAT_LIST[x].bits == format) {
01149          newindex = x + 1;
01150          break;
01151       }
01152    }
01153 
01154    if(newindex) {
01155       for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01156          if(!pref->order[x]) {
01157             pref->order[x] = newindex;
01158             break;
01159          }
01160       }
01161    }
01162 
01163    return x;
01164 }

void ast_codec_pref_convert ( struct ast_codec_pref pref,
char *  buf,
size_t  size,
int  right 
)

Shift an audio codec preference list up or down 65 bytes so that it becomes an ASCII string.

Definition at line 1043 of file frame.c.

References ast_codec_pref::order.

Referenced by check_access(), create_addr(), dump_prefs(), and socket_process().

01044 {
01045    int x, differential = (int) 'A', mem;
01046    char *from, *to;
01047 
01048    if(right) {
01049       from = pref->order;
01050       to = buf;
01051       mem = size;
01052    } else {
01053       to = pref->order;
01054       from = buf;
01055       mem = 32;
01056    }
01057 
01058    memset(to, 0, mem);
01059    for (x = 0; x < 32 ; x++) {
01060       if(!from[x])
01061          break;
01062       to[x] = right ? (from[x] + differential) : (from[x] - differential);
01063    }
01064 }

struct ast_format_list ast_codec_pref_getsize ( struct ast_codec_pref pref,
int  format 
)

Get packet size for codec.

Definition at line 1243 of file frame.c.

References AST_FORMAT_LIST, ast_format_list::bits, and format.

Referenced by add_codec_to_sdp(), ast_rtp_bridge(), ast_rtp_write(), handle_open_receive_channel_ack_message(), and transmit_connect().

01244 {
01245    int x, index = -1, framems = 0;
01246    struct ast_format_list fmt = {0};
01247 
01248    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01249       if(AST_FORMAT_LIST[x].bits == format) {
01250          fmt = AST_FORMAT_LIST[x];
01251          index = x;
01252          break;
01253       }
01254    }
01255 
01256    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01257       if(pref->order[x] == (index + 1)) {
01258          framems = pref->framing[x];
01259          break;
01260       }
01261    }
01262 
01263    /* size validation */
01264    if(!framems)
01265       framems = AST_FORMAT_LIST[index].def_ms;
01266 
01267    if(AST_FORMAT_LIST[index].inc_ms && framems % AST_FORMAT_LIST[index].inc_ms) /* avoid division by zero */
01268       framems -= framems % AST_FORMAT_LIST[index].inc_ms;
01269 
01270    if(framems < AST_FORMAT_LIST[index].min_ms)
01271       framems = AST_FORMAT_LIST[index].min_ms;
01272 
01273    if(framems > AST_FORMAT_LIST[index].max_ms)
01274       framems = AST_FORMAT_LIST[index].max_ms;
01275 
01276    fmt.cur_ms = framems;
01277 
01278    return fmt;
01279 }

int ast_codec_pref_index ( struct ast_codec_pref pref,
int  index 
)

Codec located at a particular place in the preference index See Audio Codec Preferences.

Definition at line 1101 of file frame.c.

References AST_FORMAT_LIST, ast_format_list::bits, and ast_codec_pref::order.

Referenced by _sip_show_peer(), add_sdp(), ast_codec_pref_string(), function_iaxpeer(), function_sippeer(), gtalk_invite(), iax2_show_peer(), print_codec_to_cli(), and socket_process().

01102 {
01103    int slot = 0;
01104 
01105    
01106    if((index >= 0) && (index < sizeof(pref->order))) {
01107       slot = pref->order[index];
01108    }
01109 
01110    return slot ? AST_FORMAT_LIST[slot-1].bits : 0;
01111 }

void ast_codec_pref_prepend ( struct ast_codec_pref pref,
int  format,
int  only_if_existing 
)

Prepend an audio codec to a preference list, removing it first if it was already there.

Definition at line 1167 of file frame.c.

References ARRAY_LEN, AST_FORMAT_LIST, ast_codec_pref::framing, and ast_codec_pref::order.

Referenced by create_addr().

01168 {
01169    int x, newindex = 0;
01170 
01171    /* First step is to get the codecs "index number" */
01172    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01173       if (AST_FORMAT_LIST[x].bits == format) {
01174          newindex = x + 1;
01175          break;
01176       }
01177    }
01178    /* Done if its unknown */
01179    if (!newindex)
01180       return;
01181 
01182    /* Now find any existing occurrence, or the end */
01183    for (x = 0; x < 32; x++) {
01184       if (!pref->order[x] || pref->order[x] == newindex)
01185          break;
01186    }
01187 
01188    if (only_if_existing && !pref->order[x])
01189       return;
01190 
01191    /* Move down to make space to insert - either all the way to the end,
01192       or as far as the existing location (which will be overwritten) */
01193    for (; x > 0; x--) {
01194       pref->order[x] = pref->order[x - 1];
01195       pref->framing[x] = pref->framing[x - 1];
01196    }
01197 
01198    /* And insert the new entry */
01199    pref->order[0] = newindex;
01200    pref->framing[0] = 0; /* ? */
01201 }

void ast_codec_pref_remove ( struct ast_codec_pref pref,
int  format 
)

Remove audio a codec from a preference list.

Definition at line 1114 of file frame.c.

References AST_FORMAT_LIST, and ast_codec_pref::order.

Referenced by ast_codec_pref_append(), and ast_parse_allow_disallow().

01115 {
01116    struct ast_codec_pref oldorder;
01117    int x, y = 0;
01118    int slot;
01119    int size;
01120 
01121    if(!pref->order[0])
01122       return;
01123 
01124    memcpy(&oldorder, pref, sizeof(oldorder));
01125    memset(pref, 0, sizeof(*pref));
01126 
01127    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01128       slot = oldorder.order[x];
01129       size = oldorder.framing[x];
01130       if(! slot)
01131          break;
01132       if(AST_FORMAT_LIST[slot-1].bits != format) {
01133          pref->order[y] = slot;
01134          pref->framing[y++] = size;
01135       }
01136    }
01137    
01138 }

int ast_codec_pref_setsize ( struct ast_codec_pref pref,
int  format,
int  framems 
)

Set packet size for codec.

Definition at line 1204 of file frame.c.

References AST_FORMAT_LIST, ast_codec_pref::framing, and ast_codec_pref::order.

Referenced by ast_parse_allow_disallow(), and process_sdp().

01205 {
01206    int x, index = -1;
01207 
01208    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01209       if(AST_FORMAT_LIST[x].bits == format) {
01210          index = x;
01211          break;
01212       }
01213    }
01214 
01215    if(index < 0)
01216       return -1;
01217 
01218    /* size validation */
01219    if(!framems)
01220       framems = AST_FORMAT_LIST[index].def_ms;
01221 
01222    if(AST_FORMAT_LIST[index].inc_ms && framems % AST_FORMAT_LIST[index].inc_ms) /* avoid division by zero */
01223       framems -= framems % AST_FORMAT_LIST[index].inc_ms;
01224 
01225    if(framems < AST_FORMAT_LIST[index].min_ms)
01226       framems = AST_FORMAT_LIST[index].min_ms;
01227 
01228    if(framems > AST_FORMAT_LIST[index].max_ms)
01229       framems = AST_FORMAT_LIST[index].max_ms;
01230 
01231 
01232    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01233       if(pref->order[x] == (index + 1)) {
01234          pref->framing[x] = framems;
01235          break;
01236       }
01237    }
01238 
01239    return x;
01240 }

int ast_codec_pref_string ( struct ast_codec_pref pref,
char *  buf,
size_t  size 
)

Dump audio codec preference list into a string.

Definition at line 1066 of file frame.c.

References ast_codec_pref_index(), and ast_getformatname().

Referenced by dump_prefs(), and socket_process().

01067 {
01068    int x, codec; 
01069    size_t total_len, slen;
01070    char *formatname;
01071    
01072    memset(buf,0,size);
01073    total_len = size;
01074    buf[0] = '(';
01075    total_len--;
01076    for(x = 0; x < 32 ; x++) {
01077       if(total_len <= 0)
01078          break;
01079       if(!(codec = ast_codec_pref_index(pref,x)))
01080          break;
01081       if((formatname = ast_getformatname(codec))) {
01082          slen = strlen(formatname);
01083          if(slen > total_len)
01084             break;
01085          strncat(buf, formatname, total_len - 1); /* safe */
01086          total_len -= slen;
01087       }
01088       if(total_len && x < 31 && ast_codec_pref_index(pref , x + 1)) {
01089          strncat(buf, "|", total_len - 1); /* safe */
01090          total_len--;
01091       }
01092    }
01093    if(total_len) {
01094       strncat(buf, ")", total_len - 1); /* safe */
01095       total_len--;
01096    }
01097 
01098    return size - total_len;
01099 }

static const char* ast_expand_codec_alias ( const char *  in  )  [static]

Definition at line 578 of file frame.c.

Referenced by ast_getformatbyname().

00579 {
00580    int x;
00581 
00582    for (x = 0; x < sizeof(ast_codec_alias_table) / sizeof(ast_codec_alias_table[0]); x++) {
00583       if(!strcmp(in,ast_codec_alias_table[x].alias))
00584          return ast_codec_alias_table[x].realname;
00585    }
00586    return in;
00587 }

int ast_frame_adjust_volume ( struct ast_frame f,
int  adjustment 
)

Adjusts the volume of the audio samples contained in a frame.

Parameters:
f The frame containing the samples (must be AST_FRAME_VOICE and AST_FORMAT_SLINEAR)
adjustment The number of dB to adjust up or down.
Returns:
0 for success, non-zero for an error

Definition at line 1576 of file frame.c.

References AST_FORMAT_SLINEAR, AST_FRAME_VOICE, ast_slinear_saturated_divide(), ast_slinear_saturated_multiply(), and f.

Referenced by audiohook_read_frame_single(), and conf_run().

01577 {
01578    int count;
01579    short *fdata = f->data;
01580    short adjust_value = abs(adjustment);
01581 
01582    if ((f->frametype != AST_FRAME_VOICE) || (f->subclass != AST_FORMAT_SLINEAR))
01583       return -1;
01584 
01585    if (!adjustment)
01586       return 0;
01587 
01588    for (count = 0; count < f->samples; count++) {
01589       if (adjustment > 0) {
01590          ast_slinear_saturated_multiply(&fdata[count], &adjust_value);
01591       } else if (adjustment < 0) {
01592          ast_slinear_saturated_divide(&fdata[count], &adjust_value);
01593       }
01594    }
01595 
01596    return 0;
01597 }

void ast_frame_dump ( const char *  name,
struct ast_frame f,
char *  prefix 
)

Dump a frame for debugging purposes

Definition at line 761 of file frame.c.

References AST_CONTROL_ANSWER, AST_CONTROL_BUSY, AST_CONTROL_CONGESTION, AST_CONTROL_FLASH, AST_CONTROL_HANGUP, AST_CONTROL_HOLD, AST_CONTROL_OFFHOOK, AST_CONTROL_OPTION, AST_CONTROL_PROCEEDING, AST_CONTROL_PROGRESS, AST_CONTROL_RADIO_KEY, AST_CONTROL_RADIO_UNKEY, AST_CONTROL_RING, AST_CONTROL_RINGING, AST_CONTROL_TAKEOFFHOOK, AST_CONTROL_UNHOLD, AST_CONTROL_WINK, ast_copy_string(), AST_FRAME_CONTROL, AST_FRAME_DTMF_BEGIN, AST_FRAME_DTMF_END, AST_FRAME_HTML, AST_FRAME_IAX, AST_FRAME_IMAGE, AST_FRAME_MODEM, AST_FRAME_NULL, AST_FRAME_TEXT, AST_FRAME_VIDEO, AST_FRAME_VOICE, ast_getformatname(), AST_HTML_BEGIN, AST_HTML_DATA, AST_HTML_END, AST_HTML_LDCOMPLETE, AST_HTML_LINKREJECT, AST_HTML_LINKURL, AST_HTML_NOSUPPORT, AST_HTML_UNLINK, AST_HTML_URL, AST_MODEM_T38, AST_MODEM_V150, ast_strlen_zero(), ast_verbose(), COLOR_BLACK, COLOR_BRCYAN, COLOR_BRGREEN, COLOR_BRMAGENTA, COLOR_BRRED, COLOR_YELLOW, f, and term_color().

Referenced by __ast_read(), and ast_write().

00762 {
00763    const char noname[] = "unknown";
00764    char ftype[40] = "Unknown Frametype";
00765    char cft[80];
00766    char subclass[40] = "Unknown Subclass";
00767    char csub[80];
00768    char moreinfo[40] = "";
00769    char cn[60];
00770    char cp[40];
00771    char cmn[40];
00772 
00773    if (!name)
00774       name = noname;
00775 
00776 
00777    if (!f) {
00778       ast_verbose("%s [ %s (NULL) ] [%s]\n", 
00779          term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00780          term_color(cft, "HANGUP", COLOR_BRRED, COLOR_BLACK, sizeof(cft)), 
00781          term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00782       return;
00783    }
00784    /* XXX We should probably print one each of voice and video when the format changes XXX */
00785    if (f->frametype == AST_FRAME_VOICE)
00786       return;
00787    if (f->frametype == AST_FRAME_VIDEO)
00788       return;
00789    switch(f->frametype) {
00790    case AST_FRAME_DTMF_BEGIN:
00791       strcpy(ftype, "DTMF Begin");
00792       subclass[0] = f->subclass;
00793       subclass[1] = '\0';
00794       break;
00795    case AST_FRAME_DTMF_END:
00796       strcpy(ftype, "DTMF End");
00797       subclass[0] = f->subclass;
00798       subclass[1] = '\0';
00799       break;
00800    case AST_FRAME_CONTROL:
00801       strcpy(ftype, "Control");
00802       switch(f->subclass) {
00803       case AST_CONTROL_HANGUP:
00804          strcpy(subclass, "Hangup");
00805          break;
00806       case AST_CONTROL_RING:
00807          strcpy(subclass, "Ring");
00808          break;
00809       case AST_CONTROL_RINGING:
00810          strcpy(subclass, "Ringing");
00811          break;
00812       case AST_CONTROL_ANSWER:
00813          strcpy(subclass, "Answer");
00814          break;
00815       case AST_CONTROL_BUSY:
00816          strcpy(subclass, "Busy");
00817          break;
00818       case AST_CONTROL_TAKEOFFHOOK:
00819          strcpy(subclass, "Take Off Hook");
00820          break;
00821       case AST_CONTROL_OFFHOOK:
00822          strcpy(subclass, "Line Off Hook");
00823          break;
00824       case AST_CONTROL_CONGESTION:
00825          strcpy(subclass, "Congestion");
00826          break;
00827       case AST_CONTROL_FLASH:
00828          strcpy(subclass, "Flash");
00829          break;
00830       case AST_CONTROL_WINK:
00831          strcpy(subclass, "Wink");
00832          break;
00833       case AST_CONTROL_OPTION:
00834          strcpy(subclass, "Option");
00835          break;
00836       case AST_CONTROL_RADIO_KEY:
00837          strcpy(subclass, "Key Radio");
00838          break;
00839       case AST_CONTROL_RADIO_UNKEY:
00840          strcpy(subclass, "Unkey Radio");
00841          break;
00842       case AST_CONTROL_PROGRESS:
00843          strcpy(subclass, "Call Progress");
00844          break;
00845       case AST_CONTROL_PROCEEDING:
00846          strcpy(subclass, "Proceeding");
00847          break;
00848       case AST_CONTROL_HOLD:
00849         strcpy(subclass, "Hold");
00850         break;
00851       case AST_CONTROL_UNHOLD:
00852         strcpy(subclass, "UnHold");
00853         break;
00854       case -1:
00855          strcpy(subclass, "Stop generators");
00856          break;
00857       default:
00858          snprintf(subclass, sizeof(subclass), "Unknown control '%d'", f->subclass);
00859       }
00860       break;
00861    case AST_FRAME_NULL:
00862       strcpy(ftype, "Null Frame");
00863       strcpy(subclass, "N/A");
00864       break;
00865    case AST_FRAME_IAX:
00866       /* Should never happen */
00867       strcpy(ftype, "IAX Specific");
00868       snprintf(subclass, sizeof(subclass), "IAX Frametype %d", f->subclass);
00869       break;
00870    case AST_FRAME_TEXT:
00871       strcpy(ftype, "Text");
00872       strcpy(subclass, "N/A");
00873       ast_copy_string(moreinfo, f->data, sizeof(moreinfo));
00874       break;
00875    case AST_FRAME_IMAGE:
00876       strcpy(ftype, "Image");
00877       snprintf(subclass, sizeof(subclass), "Image format %s\n", ast_getformatname(f->subclass));
00878       break;
00879    case AST_FRAME_HTML:
00880       strcpy(ftype, "HTML");
00881       switch(f->subclass) {
00882       case AST_HTML_URL:
00883          strcpy(subclass, "URL");
00884          ast_copy_string(moreinfo, f->data, sizeof(moreinfo));
00885          break;
00886       case AST_HTML_DATA:
00887          strcpy(subclass, "Data");
00888          break;
00889       case AST_HTML_BEGIN:
00890          strcpy(subclass, "Begin");
00891          break;
00892       case AST_HTML_END:
00893          strcpy(subclass, "End");
00894          break;
00895       case AST_HTML_LDCOMPLETE:
00896          strcpy(subclass, "Load Complete");
00897          break;
00898       case AST_HTML_NOSUPPORT:
00899          strcpy(subclass, "No Support");
00900          break;
00901       case AST_HTML_LINKURL:
00902          strcpy(subclass, "Link URL");
00903          ast_copy_string(moreinfo, f->data, sizeof(moreinfo));
00904          break;
00905       case AST_HTML_UNLINK:
00906          strcpy(subclass, "Unlink");
00907          break;
00908       case AST_HTML_LINKREJECT:
00909          strcpy(subclass, "Link Reject");
00910          break;
00911       default:
00912          snprintf(subclass, sizeof(subclass), "Unknown HTML frame '%d'\n", f->subclass);
00913          break;
00914       }
00915       break;
00916    case AST_FRAME_MODEM:
00917       strcpy(ftype, "Modem");
00918       switch (f->subclass) {
00919       case AST_MODEM_T38:
00920          strcpy(subclass, "T.38");
00921          break;
00922       case AST_MODEM_V150:
00923          strcpy(subclass, "V.150");
00924          break;
00925       default:
00926          snprintf(subclass, sizeof(subclass), "Unknown MODEM frame '%d'\n", f->subclass);
00927          break;
00928       }
00929       break;
00930    default:
00931       snprintf(ftype, sizeof(ftype), "Unknown Frametype '%d'", f->frametype);
00932    }
00933    if (!ast_strlen_zero(moreinfo))
00934       ast_verbose("%s [ TYPE: %s (%d) SUBCLASS: %s (%d) '%s' ] [%s]\n",  
00935              term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00936              term_color(cft, ftype, COLOR_BRRED, COLOR_BLACK, sizeof(cft)),
00937              f->frametype, 
00938              term_color(csub, subclass, COLOR_BRCYAN, COLOR_BLACK, sizeof(csub)),
00939              f->subclass, 
00940              term_color(cmn, moreinfo, COLOR_BRGREEN, COLOR_BLACK, sizeof(cmn)),
00941              term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00942    else
00943       ast_verbose("%s [ TYPE: %s (%d) SUBCLASS: %s (%d) ] [%s]\n",  
00944              term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00945              term_color(cft, ftype, COLOR_BRRED, COLOR_BLACK, sizeof(cft)),
00946              f->frametype, 
00947              term_color(csub, subclass, COLOR_BRCYAN, COLOR_BLACK, sizeof(csub)),
00948              f->subclass, 
00949              term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00950 }

void ast_frame_free ( struct ast_frame fr,
int  cache 
)

Requests a frame to be allocated Frees a frame.

Parameters:
fr Frame to free
cache Whether to consider this frame for frame caching

Definition at line 322 of file frame.c.

References ast_dsp_frame_freed(), ast_filestream_frame_freed(), AST_FRFLAG_FROM_DSP, AST_FRFLAG_FROM_FILESTREAM, AST_FRFLAG_FROM_TRANSLATOR, AST_LIST_INSERT_HEAD, AST_LIST_LOCK, AST_LIST_REMOVE, AST_LIST_UNLOCK, AST_MALLOCD_DATA, AST_MALLOCD_HDR, AST_MALLOCD_SRC, ast_test_flag, ast_threadstorage_get(), ast_translate_frame_freed(), ast_frame::data, frame_cache, FRAME_CACHE_MAX_SIZE, frames, free, ast_frame::mallocd, ast_frame::offset, and ast_frame::src.

Referenced by mixmonitor_thread().

00323 {
00324    if (ast_test_flag(fr, AST_FRFLAG_FROM_TRANSLATOR)) {
00325       ast_translate_frame_freed(fr);
00326    } else if (ast_test_flag(fr, AST_FRFLAG_FROM_DSP)) {
00327       ast_dsp_frame_freed(fr);
00328    } else if (ast_test_flag(fr, AST_FRFLAG_FROM_FILESTREAM)) {
00329       ast_filestream_frame_freed(fr);
00330    }
00331 
00332    if (!fr->mallocd)
00333       return;
00334 
00335 #if !defined(LOW_MEMORY)
00336    if (cache && fr->mallocd == AST_MALLOCD_HDR) {
00337       /* Cool, only the header is malloc'd, let's just cache those for now 
00338        * to keep things simple... */
00339       struct ast_frame_cache *frames;
00340 
00341       if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames))) 
00342           && frames->size < FRAME_CACHE_MAX_SIZE) {
00343          AST_LIST_INSERT_HEAD(&frames->list, fr, frame_list);
00344          frames->size++;
00345          return;
00346       }
00347    }
00348 #endif
00349    
00350    if (fr->mallocd & AST_MALLOCD_DATA) {
00351       if (fr->data) 
00352          free(fr->data - fr->offset);
00353    }
00354    if (fr->mallocd & AST_MALLOCD_SRC) {
00355       if (fr->src)
00356          free((char *)fr->src);
00357    }
00358    if (fr->mallocd & AST_MALLOCD_HDR) {
00359 #ifdef TRACE_FRAMES
00360       AST_LIST_LOCK(&headerlist);
00361       headers--;
00362       AST_LIST_REMOVE(&headerlist, fr, frame_list);
00363       AST_LIST_UNLOCK(&headerlist);
00364 #endif         
00365       free(fr);
00366    }
00367 }

static struct ast_frame* ast_frame_header_new ( void   )  [static]

Definition at line 274 of file frame.c.

References ast_calloc, ast_calloc_cache, AST_LIST_INSERT_HEAD, AST_LIST_LOCK, AST_LIST_REMOVE_HEAD, AST_LIST_UNLOCK, AST_MALLOCD_HDR, ast_threadstorage_get(), f, frame_cache, and frames.

Referenced by ast_frisolate().

00275 {
00276    struct ast_frame *f;
00277 
00278 #if !defined(LOW_MEMORY)
00279    struct ast_frame_cache *frames;
00280 
00281    if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames)))) {
00282       if ((f = AST_LIST_REMOVE_HEAD(&frames->list, frame_list))) {
00283          size_t mallocd_len = f->mallocd_hdr_len;
00284          memset(f, 0, sizeof(*f));
00285          f->mallocd_hdr_len = mallocd_len;
00286          f->mallocd = AST_MALLOCD_HDR;
00287          frames->size--;
00288          return f;
00289       }
00290    }
00291    if (!(f = ast_calloc_cache(1, sizeof(*f))))
00292       return NULL;
00293 #else
00294    if (!(f = ast_calloc(1, sizeof(*f))))
00295       return NULL;
00296 #endif
00297 
00298    f->mallocd_hdr_len = sizeof(*f);
00299 #ifdef TRACE_FRAMES
00300    AST_LIST_LOCK(&headerlist);
00301    headers++;
00302    AST_LIST_INSERT_HEAD(&headerlist, f, frame_list);
00303    AST_LIST_UNLOCK(&headerlist);
00304 #endif   
00305    
00306    return f;
00307 }

int ast_frame_slinear_sum ( struct ast_frame f1,
struct ast_frame f2 
)

Sums two frames of audio samples.

Parameters:
f1 The first frame (which will contain the result)
f2 The second frame
Returns:
0 for success, non-zero for an error
The frames must be AST_FRAME_VOICE and must contain AST_FORMAT_SLINEAR samples, and must contain the same number of samples.

Definition at line 1599 of file frame.c.

References AST_FORMAT_SLINEAR, AST_FRAME_VOICE, ast_slinear_saturated_add(), ast_frame::data, ast_frame::frametype, ast_frame::samples, and ast_frame::subclass.

01600 {
01601    int count;
01602    short *data1, *data2;
01603 
01604    if ((f1->frametype != AST_FRAME_VOICE) || (f1->subclass != AST_FORMAT_SLINEAR))
01605       return -1;
01606 
01607    if ((f2->frametype != AST_FRAME_VOICE) || (f2->subclass != AST_FORMAT_SLINEAR))
01608       return -1;
01609 
01610    if (f1->samples != f2->samples)
01611       return -1;
01612 
01613    for (count = 0, data1 = f1->data, data2 = f2->data;
01614         count < f1->samples;
01615         count++, data1++, data2++)
01616       ast_slinear_saturated_add(data1, data2);
01617 
01618    return 0;
01619 }

struct ast_frame* ast_frdup ( const struct ast_frame fr  ) 

Copies a frame.

Parameters:
fr frame to copy Duplicates a frame -- should only rarely be used, typically frisolate is good enough
Returns:
Returns a frame on success, NULL on error

Definition at line 433 of file frame.c.

References ast_calloc_cache, ast_copy_flags, AST_FRFLAG_HAS_TIMING_INFO, AST_FRIENDLY_OFFSET, AST_LIST_REMOVE_CURRENT, AST_LIST_TRAVERSE_SAFE_BEGIN, AST_LIST_TRAVERSE_SAFE_END, AST_MALLOCD_HDR, ast_threadstorage_get(), ast_frame::data, ast_frame::datalen, ast_frame::delivery, f, frame_cache, frames, ast_frame::frametype, len(), ast_frame::len, ast_frame::mallocd, ast_frame::mallocd_hdr_len, ast_frame::offset, ast_frame::samples, ast_frame::seqno, ast_frame::src, ast_frame::subclass, and ast_frame::ts.

Referenced by __ast_queue_frame(), ast_jb_put(), ast_rtp_write(), ast_slinfactory_feed(), audiohook_read_frame_single(), autoservice_run(), recordthread(), and rpt().

00434 {
00435    struct ast_frame *out = NULL;
00436    int len, srclen = 0;
00437    void *buf = NULL;
00438 
00439 #if !defined(LOW_MEMORY)
00440    struct ast_frame_cache *frames;
00441 #endif
00442 
00443    /* Start with standard stuff */
00444    len = sizeof(*out) + AST_FRIENDLY_OFFSET + f->datalen;
00445    /* If we have a source, add space for it */
00446    /*
00447     * XXX Watch out here - if we receive a src which is not terminated
00448     * properly, we can be easily attacked. Should limit the size we deal with.
00449     */
00450    if (f->src)
00451       srclen = strlen(f->src);
00452    if (srclen > 0)
00453       len += srclen + 1;
00454    
00455 #if !defined(LOW_MEMORY)
00456    if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames)))) {
00457       AST_LIST_TRAVERSE_SAFE_BEGIN(&frames->list, out, frame_list) {
00458          if (out->mallocd_hdr_len >= len) {
00459             size_t mallocd_len = out->mallocd_hdr_len;
00460             AST_LIST_REMOVE_CURRENT(&frames->list, frame_list);
00461             memset(out, 0, sizeof(*out));
00462             out->mallocd_hdr_len = mallocd_len;
00463             buf = out;
00464             frames->size--;
00465             break;
00466          }
00467       }
00468       AST_LIST_TRAVERSE_SAFE_END
00469    }
00470 #endif
00471 
00472    if (!buf) {
00473       if (!(buf = ast_calloc_cache(1, len)))
00474          return NULL;
00475       out = buf;
00476       out->mallocd_hdr_len = len;
00477    }
00478 
00479    out->frametype = f->frametype;
00480    out->subclass = f->subclass;
00481    out->datalen = f->datalen;
00482    out->samples = f->samples;
00483    out->delivery = f->delivery;
00484    /* Set us as having malloc'd header only, so it will eventually
00485       get freed. */
00486    out->mallocd = AST_MALLOCD_HDR;
00487    out->offset = AST_FRIENDLY_OFFSET;
00488    if (out->datalen) {
00489       out->data = buf + sizeof(*out) + AST_FRIENDLY_OFFSET;
00490       memcpy(out->data, f->data, out->datalen); 
00491    }
00492    if (srclen > 0) {
00493       /* This may seem a little strange, but it's to avoid a gcc (4.2.4) compiler warning */
00494       char *src;
00495       out->src = buf + sizeof(*out) + AST_FRIENDLY_OFFSET + f->datalen;
00496       src = (char *) out->src;
00497       /* Must have space since we allocated for it */
00498       strcpy(src, f->src);
00499    }
00500    ast_copy_flags(out, f, AST_FRFLAG_HAS_TIMING_INFO);
00501    out->ts = f->ts;
00502    out->len = f->len;
00503    out->seqno = f->seqno;
00504    return out;
00505 }

struct ast_frame* ast_frisolate ( struct ast_frame fr  ) 

Makes a frame independent of any static storage.

Parameters:
fr frame to act upon Take a frame, and if it's not been malloc'd, make a malloc'd copy and if the data hasn't been malloced then make the data malloc'd. If you need to store frames, say for queueing, then you should call this function.
Returns:
Returns a frame on success, NULL on error

Definition at line 374 of file frame.c.

References ast_clear_flag, ast_copy_flags, ast_frame_header_new(), AST_FRFLAG_FROM_DSP, AST_FRFLAG_FROM_TRANSLATOR, AST_FRFLAG_HAS_TIMING_INFO, AST_FRIENDLY_OFFSET, ast_malloc, AST_MALLOCD_DATA, AST_MALLOCD_HDR, AST_MALLOCD_SRC, ast_strdup, ast_test_flag, ast_frame::data, ast_frame::datalen, ast_frame::frametype, free, ast_frame::len, ast_frame::mallocd, ast_frame::offset, ast_frame::samples, ast_frame::seqno, ast_frame::src, ast_frame::subclass, and ast_frame::ts.

Referenced by jpeg_read_image().

00375 {
00376    struct ast_frame *out;
00377    void *newdata;
00378 
00379    ast_clear_flag(fr, AST_FRFLAG_FROM_TRANSLATOR);
00380    ast_clear_flag(fr, AST_FRFLAG_FROM_DSP);
00381 
00382    if (!(fr->mallocd & AST_MALLOCD_HDR)) {
00383       /* Allocate a new header if needed */
00384       if (!(out = ast_frame_header_new()))
00385          return NULL;
00386       out->frametype = fr->frametype;
00387       out->subclass = fr->subclass;
00388       out->datalen = fr->datalen;
00389       out->samples = fr->samples;
00390       out->offset = fr->offset;
00391       out->data = fr->data;
00392       /* Copy the timing data */
00393       ast_copy_flags(out, fr, AST_FRFLAG_HAS_TIMING_INFO);
00394       if (ast_test_flag(fr, AST_FRFLAG_HAS_TIMING_INFO)) {
00395          out->ts = fr->ts;
00396          out->len = fr->len;
00397          out->seqno = fr->seqno;
00398       }
00399    } else
00400       out = fr;
00401    
00402    if (!(fr->mallocd & AST_MALLOCD_SRC)) {
00403       if (fr->src) {
00404          if (!(out->src = ast_strdup(fr->src))) {
00405             if (out != fr)
00406                free(out);
00407             return NULL;
00408          }
00409       }
00410    } else
00411       out->src = fr->src;
00412    
00413    if (!(fr->mallocd & AST_MALLOCD_DATA))  {
00414       if (!(newdata = ast_malloc(fr->datalen + AST_FRIENDLY_OFFSET))) {
00415          if (out->src != fr->src)
00416             free((void *) out->src);
00417          if (out != fr)
00418             free(out);
00419          return NULL;
00420       }
00421       newdata += AST_FRIENDLY_OFFSET;
00422       out->offset = AST_FRIENDLY_OFFSET;
00423       out->datalen = fr->datalen;
00424       memcpy(newdata, fr->data, fr->datalen);
00425       out->data = newdata;
00426    }
00427 
00428    out->mallocd = AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA;
00429    
00430    return out;
00431 }

struct ast_format_list* ast_get_format_list ( size_t *  size  ) 

Definition at line 523 of file frame.c.

References AST_FORMAT_LIST.

00524 {
00525    *size = (sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]));
00526    return AST_FORMAT_LIST;
00527 }

struct ast_format_list* ast_get_format_list_index ( int  index  ) 

Definition at line 518 of file frame.c.

References AST_FORMAT_LIST.

00519 {
00520    return &AST_FORMAT_LIST[index];
00521 }

int ast_getformatbyname ( const char *  name  ) 

Gets a format from a name.

Parameters:
name string of format
Returns:
This returns the form of the format in binary on success, 0 on error.

Definition at line 589 of file frame.c.

References ast_expand_codec_alias(), AST_FORMAT_LIST, and format.

Referenced by ast_parse_allow_disallow(), iax_template_parse(), reload_config(), and try_suggested_sip_codec().

00590 {
00591    int x, all, format = 0;
00592 
00593    all = strcasecmp(name, "all") ? 0 : 1;
00594    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
00595       if(AST_FORMAT_LIST[x].visible && (all || 
00596            !strcasecmp(AST_FORMAT_LIST[x].name,name) ||
00597            !strcasecmp(AST_FORMAT_LIST[x].name,ast_expand_codec_alias(name)))) {
00598          format |= AST_FORMAT_LIST[x].bits;
00599          if(!all)
00600             break;
00601       }
00602    }
00603 
00604    return format;
00605 }

char* ast_getformatname ( int  format  ) 

Get the name of a format.

Parameters:
format id of format
Returns:
A static string containing the name of the format or "unknown" if unknown.

Definition at line 529 of file frame.c.

References AST_FORMAT_LIST, ast_format_list::bits, name, and ast_format_list::visible.

Referenced by __ast_play_and_record(), __ast_read(), __ast_register_translator(), __login_exec(), _sip_show_peer(), add_codec_to_answer(), add_codec_to_sdp(), agent_call(), ast_codec_get_len(), ast_codec_get_samples(), ast_codec_pref_string(), ast_dsp_process(), ast_frame_dump(), ast_openvstream(), ast_rtp_write(), ast_slinfactory_feed(), ast_streamfile(), ast_translator_build_path(), ast_unregister_translator(), ast_writestream(), background_detect_exec(), dahdi_read(), do_waiting(), eagi_exec(), func_channel_read(), function_iaxpeer(), function_sippeer(), gtalk_show_channels(), iax2_request(), iax2_show_channels(), iax2_show_peer(), iax_show_provisioning(), moh_classes_show(), moh_release(), oh323_rtp_read(), phone_setup(), print_codec_to_cli(), rebuild_matrix(), register_translator(), set_format(), set_peer_capabilities(), show_codecs(), show_codecs_deprecated(), show_file_formats(), show_file_formats_deprecated(), show_image_formats(), show_image_formats_deprecated(), show_translation(), show_translation_deprecated(), sip_request_call(), sip_rtp_read(), and socket_process().

00530 {
00531    int x;
00532    char *ret = "unknown";
00533    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
00534       if(AST_FORMAT_LIST[x].visible && AST_FORMAT_LIST[x].bits == format) {
00535          ret = AST_FORMAT_LIST[x].name;
00536          break;
00537       }
00538    }
00539    return ret;
00540 }

char* ast_getformatname_multiple ( char *  buf,
size_t  size,
int  format 
)

Get the names of a set of formats.

Parameters:
buf a buffer for the output string
size size of buf (bytes)
format the format (combined IDs of codecs) Prints a list of readable codec names corresponding to "format". ex: for format=AST_FORMAT_GSM|AST_FORMAT_SPEEX|AST_FORMAT_ILBC it will return "0x602 (GSM|SPEEX|ILBC)"
Returns:
The return value is buf.

Definition at line 542 of file frame.c.

References AST_FORMAT_LIST, ast_format_list::bits, len(), name, and ast_format_list::visible.

Referenced by __ast_read(), __sip_show_channels(), _sip_show_peer(), add_sdp(), ast_streamfile(), function_iaxpeer(), function_sippeer(), gtalk_is_answered(), gtalk_newcall(), handle_showchan(), handle_showchan_deprecated(), iax2_show_peer(), process_sdp(), serialize_showchan(), set_format(), sip_new(), sip_request_call(), sip_show_channel(), sip_show_settings(), and sip_write().

00543 {
00544    int x;
00545    unsigned len;
00546    char *start, *end = buf;
00547 
00548    if (!size)
00549       return buf;
00550    snprintf(end, size, "0x%x (", format);
00551    len = strlen(end);
00552    end += len;
00553    size -= len;
00554    start = end;
00555    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
00556       if (AST_FORMAT_LIST[x].visible && (AST_FORMAT_LIST[x].bits & format)) {
00557          snprintf(end, size,"%s|",AST_FORMAT_LIST[x].name);
00558          len = strlen(end);
00559          end += len;
00560          size -= len;
00561       }
00562    }
00563    if (start == end)
00564       snprintf(start, size, "nothing)");
00565    else if (size > 1)
00566       *(end -1) = ')';
00567    return buf;
00568 }

void ast_parse_allow_disallow ( struct ast_codec_pref pref,
int *  mask,
const char *  list,
int  allowing 
)

Parse an "allow" or "deny" line in a channel or device configuration and update the capabilities mask and pref if provided. Video codecs are not added to codec preference lists, since we can not transcode.

Definition at line 1305 of file frame.c.

References ast_codec_pref_append(), ast_codec_pref_remove(), ast_codec_pref_setsize(), AST_FORMAT_AUDIO_MASK, ast_getformatbyname(), ast_log(), ast_strdupa, format, LOG_DEBUG, LOG_WARNING, option_debug, and parse().

Referenced by action_originate(), apply_outgoing(), build_device(), build_peer(), build_user(), gtalk_create_member(), gtalk_load_config(), reload_config(), set_config(), and update_common_options().

01306 {
01307    char *parse = NULL, *this = NULL, *psize = NULL;
01308    int format = 0, framems = 0;
01309 
01310    parse = ast_strdupa(list);
01311    while ((this = strsep(&parse, ","))) {
01312       framems = 0;
01313       if ((psize = strrchr(this, ':'))) {
01314          *psize++ = '\0';
01315          if (option_debug)
01316             ast_log(LOG_DEBUG,"Packetization for codec: %s is %s\n", this, psize);
01317          framems = atoi(psize);
01318          if (framems < 0)
01319             framems = 0;
01320       }
01321       if (!(format = ast_getformatbyname(this))) {
01322          ast_log(LOG_WARNING, "Cannot %s unknown format '%s'\n", allowing ? "allow" : "disallow", this);
01323          continue;
01324       }
01325 
01326       if (mask) {
01327          if (allowing)
01328             *mask |= format;
01329          else
01330             *mask &= ~format;
01331       }
01332 
01333       /* Set up a preference list for audio. Do not include video in preferences 
01334          since we can not transcode video and have to use whatever is offered
01335        */
01336       if (pref && (format & AST_FORMAT_AUDIO_MASK)) {
01337          if (strcasecmp(this, "all")) {
01338             if (allowing) {
01339                ast_codec_pref_append(pref, format);
01340                ast_codec_pref_setsize(pref, format, framems);
01341             }
01342             else
01343                ast_codec_pref_remove(pref, format);
01344          } else if (!allowing) {
01345             memset(pref, 0, sizeof(*pref));
01346          }
01347       }
01348    }
01349 }

void ast_smoother_free ( struct ast_smoother s  ) 

Definition at line 269 of file frame.c.

References free, and s.

Referenced by ast_rtp_codec_setpref(), ast_rtp_destroy(), and ast_rtp_write().

00270 {
00271    free(s);
00272 }

int ast_smoother_get_flags ( struct ast_smoother s  ) 

Definition at line 158 of file frame.c.

References s.

00159 {
00160    return s->flags;
00161 }

struct ast_smoother* ast_smoother_new ( int  size  ) 

Definition at line 148 of file frame.c.

References ast_malloc, ast_smoother_reset(), and s.

Referenced by ast_rtp_write().

00149 {
00150    struct ast_smoother *s;
00151    if (size < 1)
00152       return NULL;
00153    if ((s = ast_malloc(sizeof(*s))))
00154       ast_smoother_reset(s, size);
00155    return s;
00156 }

struct ast_frame* ast_smoother_read ( struct ast_smoother s  ) 

Definition at line 219 of file frame.c.

References AST_FRAME_VOICE, AST_FRIENDLY_OFFSET, ast_log(), ast_samp2tv(), AST_SMOOTHER_FLAG_G729, ast_tvadd(), ast_tvzero(), len(), LOG_WARNING, and s.

Referenced by ast_rtp_write().

00220 {
00221    struct ast_frame *opt;
00222    int len;
00223 
00224    /* IF we have an optimization frame, send it */
00225    if (s->opt) {
00226       if (s->opt->offset < AST_FRIENDLY_OFFSET)
00227          ast_log(LOG_WARNING, "Returning a frame of inappropriate offset (%d).\n",
00228                      s->opt->offset);
00229       opt = s->opt;
00230       s->opt = NULL;
00231       return opt;
00232    }
00233 
00234    /* Make sure we have enough data */
00235    if (s->len < s->size) {
00236       /* Or, if this is a G.729 frame with VAD on it, send it immediately anyway */
00237       if (!((s->flags & AST_SMOOTHER_FLAG_G729) && (s->size % 10)))
00238          return NULL;
00239    }
00240    len = s->size;
00241    if (len > s->len)
00242       len = s->len;
00243    /* Make frame */
00244    s->f.frametype = AST_FRAME_VOICE;
00245    s->f.subclass = s->format;
00246    s->f.data = s->framedata + AST_FRIENDLY_OFFSET;
00247    s->f.offset = AST_FRIENDLY_OFFSET;
00248    s->f.datalen = len;
00249    /* Samples will be improper given VAD, but with VAD the concept really doesn't even exist */
00250    s->f.samples = len * s->samplesperbyte;   /* XXX rounding */
00251    s->f.delivery = s->delivery;
00252    /* Fill Data */
00253    memcpy(s->f.data, s->data, len);
00254    s->len -= len;
00255    /* Move remaining data to the front if applicable */
00256    if (s->len) {
00257       /* In principle this should all be fine because if we are sending
00258          G.729 VAD, the next timestamp will take over anyawy */
00259       memmove(s->data, s->data + len, s->len);
00260       if (!ast_tvzero(s->delivery)) {
00261          /* If we have delivery time, increment it, otherwise, leave it at 0 */
00262          s->delivery = ast_tvadd(s->delivery, ast_samp2tv(s->f.samples, 8000));
00263       }
00264    }
00265    /* Return frame */
00266    return &s->f;
00267 }

void ast_smoother_reset ( struct ast_smoother s,
int  size 
)

Definition at line 142 of file frame.c.

References s.

Referenced by ast_smoother_new().

00143 {
00144    memset(s, 0, sizeof(*s));
00145    s->size = size;
00146 }

void ast_smoother_set_flags ( struct ast_smoother s,
int  flags 
)

Definition at line 163 of file frame.c.

References s.

Referenced by ast_rtp_write().

00164 {
00165    s->flags = flags;
00166 }

int ast_smoother_test_flag ( struct ast_smoother s,
int  flag 
)

Definition at line 168 of file frame.c.

References s.

Referenced by ast_rtp_write().

00169 {
00170    return (s->flags & flag);
00171 }

void ast_swapcopy_samples ( void *  dst,
const void *  src,
int  samples 
)

Definition at line 507 of file frame.c.

Referenced by __ast_smoother_feed(), iax_frame_wrap(), and phone_write_buf().

00508 {
00509    int i;
00510    unsigned short *dst_s = dst;
00511    const unsigned short *src_s = src;
00512 
00513    for (i = 0; i < samples; i++)
00514       dst_s[i] = (src_s[i]<<8) | (src_s[i]>>8);
00515 }

static void frame_cache_cleanup ( void *  data  )  [static]

Definition at line 310 of file frame.c.

References AST_LIST_REMOVE_HEAD, f, ast_frame::frame_list, frames, and free.

00311 {
00312    struct ast_frame_cache *frames = data;
00313    struct ast_frame *f;
00314 
00315    while ((f = AST_LIST_REMOVE_HEAD(&frames->list, frame_list)))
00316       free(f);
00317    
00318    free(frames);
00319 }

static void frame_cache_init ( void   )  [static]

A per-thread cache of frame headers.

Definition at line 59 of file frame.c.

00076 {

static int g723_len ( unsigned char  buf  )  [static]

Definition at line 1351 of file frame.c.

References ast_log(), LOG_WARNING, type, TYPE_HIGH, TYPE_LOW, TYPE_MASK, and TYPE_SILENCE.

Referenced by g723_samples().

01352 {
01353    enum frame_type type = buf & TYPE_MASK;
01354 
01355    switch(type) {
01356    case TYPE_DONTSEND:
01357       return 0;
01358       break;
01359    case TYPE_SILENCE:
01360       return 4;
01361       break;
01362    case TYPE_HIGH:
01363       return 24;
01364       break;
01365    case TYPE_LOW:
01366       return 20;
01367       break;
01368    default:
01369       ast_log(LOG_WARNING, "Badly encoded frame (%d)\n", type);
01370    }
01371    return -1;
01372 }

static int g723_samples ( unsigned char *  buf,
int  maxlen 
) [static]

Definition at line 1374 of file frame.c.

References g723_len().

Referenced by ast_codec_get_samples().

01375 {
01376    int pos = 0;
01377    int samples = 0;
01378    int res;
01379    while(pos < maxlen) {
01380       res = g723_len(buf[pos]);
01381       if (res <= 0)
01382          break;
01383       samples += 240;
01384       pos += res;
01385    }
01386    return samples;
01387 }

static unsigned char get_n_bits_at ( unsigned char *  data,
int  n,
int  bit 
) [static]

Definition at line 1389 of file frame.c.

Referenced by speex_get_wb_sz_at(), and speex_samples().

01390 {
01391    int byte = bit / 8;       /* byte containing first bit */
01392    int rem = 8 - (bit % 8);  /* remaining bits in first byte */
01393    unsigned char ret = 0;
01394    
01395    if (n <= 0 || n > 8)
01396       return 0;
01397 
01398    if (rem < n) {
01399       ret = (data[byte] << (n - rem));
01400       ret |= (data[byte + 1] >> (8 - n + rem));
01401    } else {
01402       ret = (data[byte] >> (rem - n));
01403    }
01404 
01405    return (ret & (0xff >> (8 - n)));
01406 }

int init_framer ( void   ) 

Provided by frame.c

Definition at line 1037 of file frame.c.

References ast_cli_register_multiple(), and my_clis.

Referenced by main().

01038 {
01039    ast_cli_register_multiple(my_clis, sizeof(my_clis) / sizeof(struct ast_cli_entry));
01040    return 0;   
01041 }

static int show_codec_n ( int  fd,
int  argc,
char *  argv[] 
) [static]

Definition at line 734 of file frame.c.

References ast_cli(), ast_codec2str(), RESULT_SHOWUSAGE, and RESULT_SUCCESS.

00735 {
00736    int codec, i, found=0;
00737 
00738    if (argc != 4)
00739       return RESULT_SHOWUSAGE;
00740 
00741    if (sscanf(argv[3],"%d",&codec) != 1)
00742       return RESULT_SHOWUSAGE;
00743 
00744    for (i = 0; i < 32; i++)
00745       if (codec & (1 << i)) {
00746          found = 1;
00747          ast_cli(fd, "%11u (1 << %2d)  %s\n",1 << i,i,ast_codec2str(1<<i));
00748       }
00749 
00750    if (!found)
00751       ast_cli(fd, "Codec %d not found\n", codec);
00752 
00753    return RESULT_SUCCESS;
00754 }

static int show_codec_n_deprecated ( int  fd,
int  argc,
char *  argv[] 
) [static]

Definition at line 712 of file frame.c.

References ast_cli(), ast_codec2str(), RESULT_SHOWUSAGE, and RESULT_SUCCESS.

00713 {
00714    int codec, i, found=0;
00715 
00716    if (argc != 3)
00717       return RESULT_SHOWUSAGE;
00718 
00719    if (sscanf(argv[2],"%d",&codec) != 1)
00720       return RESULT_SHOWUSAGE;
00721 
00722    for (i = 0; i < 32; i++)
00723       if (codec & (1 << i)) {
00724          found = 1;
00725          ast_cli(fd, "%11u (1 << %2d)  %s\n",1 << i,i,ast_codec2str(1<<i));
00726       }
00727 
00728    if (!found)
00729       ast_cli(fd, "Codec %d not found\n", codec);
00730 
00731    return RESULT_SUCCESS;
00732 }

static int show_codecs ( int  fd,
int  argc,
char *  argv[] 
) [static]

Definition at line 664 of file frame.c.

References ast_cli(), ast_codec2str(), ast_getformatname(), ast_opt_dont_warn, RESULT_SHOWUSAGE, and RESULT_SUCCESS.

00665 {
00666    int i, found=0;
00667    char hex[25];
00668    
00669    if ((argc < 3) || (argc > 4))
00670       return RESULT_SHOWUSAGE;
00671 
00672    if (!ast_opt_dont_warn)
00673       ast_cli(fd, "Disclaimer: this command is for informational purposes only.\n"
00674             "\tIt does not indicate anything about your configuration.\n");
00675 
00676    ast_cli(fd, "%11s %9s %10s   TYPE   %8s   %s\n","INT","BINARY","HEX","NAME","DESC");
00677    ast_cli(fd, "--------------------------------------------------------------------------------\n");
00678    if ((argc == 3) || (!strcasecmp(argv[3],"audio"))) {
00679       found = 1;
00680       for (i=0;i<13;i++) {
00681          snprintf(hex,25,"(0x%x)",1<<i);
00682          ast_cli(fd, "%11u (1 << %2d) %10s  audio   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00683       }
00684    }
00685 
00686    if ((argc == 3) || (!strcasecmp(argv[3],"image"))) {
00687       found = 1;
00688       for (i=16;i<18;i++) {
00689          snprintf(hex,25,"(0x%x)",1<<i);
00690          ast_cli(fd, "%11u (1 << %2d) %10s  image   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00691       }
00692    }
00693 
00694    if ((argc == 3) || (!strcasecmp(argv[3],"video"))) {
00695       found = 1;
00696       for (i=18;i<22;i++) {
00697          snprintf(hex,25,"(0x%x)",1<<i);
00698          ast_cli(fd, "%11u (1 << %2d) %10s  video   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00699       }
00700    }
00701 
00702    if (! found)
00703       return RESULT_SHOWUSAGE;
00704    else
00705       return RESULT_SUCCESS;
00706 }

static int show_codecs_deprecated ( int  fd,
int  argc,
char *  argv[] 
) [static]

Definition at line 620 of file frame.c.

References ast_cli(), ast_codec2str(), ast_getformatname(), ast_opt_dont_warn, RESULT_SHOWUSAGE, and RESULT_SUCCESS.

00621 {
00622    int i, found=0;
00623    char hex[25];
00624    
00625    if ((argc < 2) || (argc > 3))
00626       return RESULT_SHOWUSAGE;
00627 
00628    if (!ast_opt_dont_warn)
00629       ast_cli(fd, "Disclaimer: this command is for informational purposes only.\n"
00630             "\tIt does not indicate anything about your configuration.\n");
00631 
00632    ast_cli(fd, "%11s %9s %10s   TYPE   %8s   %s\n","INT","BINARY","HEX","NAME","DESC");
00633    ast_cli(fd, "--------------------------------------------------------------------------------\n");
00634    if ((argc == 2) || (!strcasecmp(argv[1],"audio"))) {
00635       found = 1;
00636       for (i=0;i<13;i++) {
00637          snprintf(hex,25,"(0x%x)",1<<i);
00638          ast_cli(fd, "%11u (1 << %2d) %10s  audio   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00639       }
00640    }
00641 
00642    if ((argc == 2) || (!strcasecmp(argv[1],"image"))) {
00643       found = 1;
00644       for (i=16;i<18;i++) {
00645          snprintf(hex,25,"(0x%x)",1<<i);
00646          ast_cli(fd, "%11u (1 << %2d) %10s  image   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00647       }
00648    }
00649 
00650    if ((argc == 2) || (!strcasecmp(argv[1],"video"))) {
00651       found = 1;
00652       for (i=18;i<22;i++) {
00653          snprintf(hex,25,"(0x%x)",1<<i);
00654          ast_cli(fd, "%11u (1 << %2d) %10s  video   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00655       }
00656    }
00657 
00658    if (! found)
00659       return RESULT_SHOWUSAGE;
00660    else
00661       return RESULT_SUCCESS;
00662 }

static int speex_get_wb_sz_at ( unsigned char *  data,
int  len,
int  bit 
) [static]

Definition at line 1408 of file frame.c.

References ast_log(), get_n_bits_at(), and LOG_WARNING.

Referenced by speex_samples().

01409 {
01410    static int SpeexWBSubModeSz[] = {
01411       0, 36, 112, 192,
01412       352, 0, 0, 0 };
01413    int off = bit;
01414    unsigned char c;
01415 
01416    /* skip up to two wideband frames */
01417    if (((len * 8 - off) >= 5) && 
01418       get_n_bits_at(data, 1, off)) {
01419       c = get_n_bits_at(data, 3, off + 1);
01420       off += SpeexWBSubModeSz[c];
01421 
01422       if (((len * 8 - off) >= 5) && 
01423          get_n_bits_at(data, 1, off)) {
01424          c = get_n_bits_at(data, 3, off + 1);
01425          off += SpeexWBSubModeSz[c];
01426 
01427          if (((len * 8 - off) >= 5) && 
01428             get_n_bits_at(data, 1, off)) {
01429             ast_log(LOG_WARNING, "Encountered corrupt speex frame; too many wideband frames in a row.\n");
01430             return -1;
01431          }
01432       }
01433 
01434    }
01435    return off - bit;
01436 }

static int speex_samples ( unsigned char *  data,
int  len 
) [static]

Definition at line 1438 of file frame.c.

References ast_log(), get_n_bits_at(), LOG_WARNING, and speex_get_wb_sz_at().

Referenced by ast_codec_get_samples().

01439 {
01440    static int SpeexSubModeSz[] = {
01441                5, 43, 119, 160,
01442       220, 300, 364, 492, 
01443       79, 0, 0, 0,
01444       0, 0, 0, 0 };
01445    static int SpeexInBandSz[] = { 
01446       1, 1, 4, 4,
01447       4, 4, 4, 4,
01448       8, 8, 16, 16,
01449       32, 32, 64, 64 };
01450    int bit = 0;
01451    int cnt = 0;
01452    int off;
01453    unsigned char c;
01454 
01455    while ((len * 8 - bit) >= 5) {
01456       /* skip wideband frames */
01457       off = speex_get_wb_sz_at(data, len, bit);
01458       if (off < 0)  {
01459          ast_log(LOG_WARNING, "Had error while reading wideband frames for speex samples\n");
01460          break;
01461       }
01462       bit += off;
01463 
01464       if ((len * 8 - bit) < 5) {
01465          ast_log(LOG_WARNING, "Not enough bits remaining after wide band for speex samples.\n");
01466          break;
01467       }
01468 
01469       /* get control bits */
01470       c = get_n_bits_at(data, 5, bit);
01471       bit += 5;
01472 
01473       if (c == 15) { 
01474          /* terminator */
01475          break; 
01476       } else if (c == 14) {
01477          /* in-band signal; next 4 bits contain signal id */
01478          c = get_n_bits_at(data, 4, bit);
01479          bit += 4;
01480          bit += SpeexInBandSz[c];
01481       } else if (c == 13) {
01482          /* user in-band; next 5 bits contain msg len */
01483          c = get_n_bits_at(data, 5, bit);
01484          bit += 5;
01485          bit += c * 8;
01486       } else if (c > 8) {
01487          /* unknown */
01488          break;
01489       } else {
01490          /* skip number bits for submode (less the 5 control bits) */
01491          bit += SpeexSubModeSz[c] - 5;
01492          cnt += 160; /* new frame */
01493       }
01494    }
01495    return cnt;
01496 }


Variable Documentation

struct ast_format_list AST_FORMAT_LIST[] [static]

Definition of supported media formats (codecs).

Definition at line 109 of file frame.c.

Referenced by ast_codec2str(), ast_codec_choose(), ast_codec_pref_append(), ast_codec_pref_getsize(), ast_codec_pref_index(), ast_codec_pref_prepend(), ast_codec_pref_remove(), ast_codec_pref_setsize(), ast_get_format_list(), ast_get_format_list_index(), ast_getformatbyname(), ast_getformatname(), and ast_getformatname_multiple().

struct ast_frame ast_null_frame = { AST_FRAME_NULL, }

Queueing a null frame is fairly common, so we declare a global null frame object for this purpose instead of having to declare one on the stack

Definition at line 140 of file frame.c.

Referenced by __ast_read(), __oh323_rtp_create(), __oh323_update_info(), agent_new(), agent_read(), ast_channel_masquerade(), ast_channel_setwhentohangup(), ast_do_masquerade(), ast_rtcp_read(), ast_rtp_read(), ast_softhangup_nolock(), ast_udptl_read(), conf_run(), features_read(), gtalk_rtp_read(), handle_request_invite(), handle_response_invite(), local_read(), mgcp_rtp_read(), oh323_read(), oh323_rtp_read(), process_rfc2833(), process_sdp(), send_dtmf(), sip_read(), sip_rtp_read(), skinny_rtp_read(), and wakeup_sub().

struct ast_cli_entry cli_show_audio_codecs [static]

Initial value:

 {
   { "show", "audio", "codecs", NULL },
   show_codecs_deprecated, NULL,
   NULL }

Definition at line 982 of file frame.c.

struct ast_cli_entry cli_show_codec [static]

Initial value:

 {
   { "show", "codec", NULL },
   show_codec_n_deprecated, NULL,
   NULL }

Definition at line 997 of file frame.c.

struct ast_cli_entry cli_show_codecs [static]

Initial value:

 {
   { "show", "codecs", NULL },
   show_codecs_deprecated, NULL,
   NULL }

Definition at line 977 of file frame.c.

struct ast_cli_entry cli_show_image_codecs [static]

Initial value:

 {
   { "show", "image", "codecs", NULL },
   show_codecs_deprecated, NULL,
   NULL }

Definition at line 992 of file frame.c.

struct ast_cli_entry cli_show_video_codecs [static]

Initial value:

 {
   { "show", "video", "codecs", NULL },
   show_codecs_deprecated, NULL,
   NULL }

Definition at line 987 of file frame.c.

struct ast_threadstorage frame_cache = { .once = PTHREAD_ONCE_INIT , .key_init = frame_cache_init , } [static]

Definition at line 59 of file frame.c.

Referenced by ast_frame_free(), ast_frame_header_new(), ast_frdup(), iax_frame_free(), and iax_frame_new().

char frame_show_codec_n_usage[] [static]

Initial value:

"Usage: core show codec <number>\n"
"       Displays codec mapping\n"

Definition at line 756 of file frame.c.

char frame_show_codecs_usage[] [static]

Initial value:

"Usage: core show codecs [audio|video|image]\n"
"       Displays codec mapping\n"

Definition at line 708 of file frame.c.

struct ast_cli_entry my_clis[] [static]

Definition at line 1009 of file frame.c.

Referenced by init_framer().


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