Tue Sep 30 01:19:57 2008

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 dependency graph for frame.c:

Go to the source code of this file.

Data Structures

struct  ast_codec_alias_table
struct  ast_frame_cache
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)
 Pick a codec.
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 codec to list.
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.
struct 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 codec to list.
void ast_codec_pref_remove (struct ast_codec_pref *pref, int format)
 Remove codec from pref 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.
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.
struct ast_frameast_frdup (const struct ast_frame *f)
 Copies a frame.
struct ast_frameast_frisolate (struct ast_frame *fr)
 'isolates' a frame by duplicating non-malloc'ed components (header, src, data). On return all components are malloc'ed
struct ast_format_listast_get_format_list (size_t *size)
struct 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.
 AST_LIST_HEAD_NOLOCK (ast_frames, ast_frame)
 This is just so ast_frames, a list head struct for holding a list of ast_frame structures, is defined.
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)
struct ast_smootherast_smoother_new (int size)
struct 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)
 AST_THREADSTORAGE_CUSTOM (frame_cache, frame_cache_init, frame_cache_cleanup)
 A per-thread cache of frame headers.
static void frame_cache_cleanup (void *data)
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).
struct 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 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 69 of file frame.c.

Referenced by ast_frame_free().

#define SMOOTHER_SIZE   8000

Definition at line 81 of file frame.c.

Referenced by __ast_smoother_feed().

#define TYPE_MASK   0x3

Definition at line 90 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 83 of file frame.c.

00083                 {
00084    TYPE_HIGH,     /* 0x0 */
00085    TYPE_LOW,      /* 0x1 */
00086    TYPE_SILENCE,  /* 0x2 */
00087    TYPE_DONTSEND  /* 0x3 */
00088 };


Function Documentation

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

Definition at line 172 of file frame.c.

References AST_FRAME_VOICE, ast_log(), AST_MIN_OFFSET, AST_SMOOTHER_FLAG_G729, ast_swapcopy_samples(), ast_smoother::data, ast_frame::data, ast_frame::datalen, ast_smoother::delivery, ast_frame::delivery, ast_smoother::flags, ast_smoother::format, ast_frame::frametype, ast_smoother::len, LOG_NOTICE, LOG_WARNING, ast_frame::offset, ast_smoother::opt, ast_frame::samples, ast_smoother::samplesperbyte, ast_smoother::size, SMOOTHER_SIZE, and ast_frame::subclass.

00173 {
00174    if (f->frametype != AST_FRAME_VOICE) {
00175       ast_log(LOG_WARNING, "Huh?  Can't smooth a non-voice frame!\n");
00176       return -1;
00177    }
00178    if (!s->format) {
00179       s->format = f->subclass;
00180       s->samplesperbyte = (float)f->samples / (float)f->datalen;
00181    } else if (s->format != f->subclass) {
00182       ast_log(LOG_WARNING, "Smoother was working on %d format frames, now trying to feed %d?\n", s->format, f->subclass);
00183       return -1;
00184    }
00185    if (s->len + f->datalen > SMOOTHER_SIZE) {
00186       ast_log(LOG_WARNING, "Out of smoother space\n");
00187       return -1;
00188    }
00189    if (((f->datalen == s->size) || ((f->datalen < 10) && (s->flags & AST_SMOOTHER_FLAG_G729)))
00190              && !s->opt && (f->offset >= AST_MIN_OFFSET)) {
00191       if (!s->len) {
00192          /* Optimize by sending the frame we just got
00193             on the next read, thus eliminating the douple
00194             copy */
00195          if (swap)
00196             ast_swapcopy_samples(f->data, f->data, f->samples);
00197          s->opt = f;
00198          return 0;
00199       }
00200    }
00201    if (s->flags & AST_SMOOTHER_FLAG_G729) {
00202       if (s->len % 10) {
00203          ast_log(LOG_NOTICE, "Dropping extra frame of G.729 since we already have a VAD frame at the end\n");
00204          return 0;
00205       }
00206    }
00207    if (swap)
00208       ast_swapcopy_samples(s->data+s->len, f->data, f->samples);
00209    else
00210       memcpy(s->data + s->len, f->data, f->datalen);
00211    /* If either side is empty, reset the delivery time */
00212    if (!s->len || ast_tvzero(f->delivery) || ast_tvzero(s->delivery))   /* XXX really ? */
00213       s->delivery = f->delivery;
00214    s->len += f->datalen;
00215    return 0;
00216 }

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 600 of file frame.c.

References ast_format_list::desc.

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

00601 {
00602    int x;
00603    char *ret = "unknown";
00604    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
00605       if(AST_FORMAT_LIST[x].visible && AST_FORMAT_LIST[x].bits == codec) {
00606          ret = AST_FORMAT_LIST[x].desc;
00607          break;
00608       }
00609    }
00610    return ret;
00611 }

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

Pick a codec.

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 1280 of file frame.c.

References ast_best_codec(), AST_FORMAT_AUDIO_MASK, 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().

01281 {
01282    int x, ret = 0, slot;
01283 
01284    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01285       slot = pref->order[x];
01286 
01287       if (!slot)
01288          break;
01289       if (formats & AST_FORMAT_LIST[slot-1].bits) {
01290          ret = AST_FORMAT_LIST[slot-1].bits;
01291          break;
01292       }
01293    }
01294    if(ret & AST_FORMAT_AUDIO_MASK)
01295       return ret;
01296 
01297    if (option_debug > 3)
01298       ast_log(LOG_DEBUG, "Could not find preferred codec - %s\n", find_best ? "Going for the best codec" : "Returning zero codec");
01299 
01300       return find_best ? ast_best_codec(formats) : 0;
01301 }

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 1539 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().

01540 {
01541    int len = 0;
01542 
01543    /* XXX Still need speex, g723, and lpc10 XXX */ 
01544    switch(format) {
01545    case AST_FORMAT_ILBC:
01546       len = (samples / 240) * 50;
01547       break;
01548    case AST_FORMAT_GSM:
01549       len = (samples / 160) * 33;
01550       break;
01551    case AST_FORMAT_G729A:
01552       len = samples / 8;
01553       break;
01554    case AST_FORMAT_SLINEAR:
01555       len = samples * 2;
01556       break;
01557    case AST_FORMAT_ULAW:
01558    case AST_FORMAT_ALAW:
01559       len = samples;
01560       break;
01561    case AST_FORMAT_G722:
01562    case AST_FORMAT_ADPCM:
01563    case AST_FORMAT_G726:
01564    case AST_FORMAT_G726_AAL2:
01565       len = samples / 2;
01566       break;
01567    default:
01568       ast_log(LOG_WARNING, "Unable to calculate sample length for format %s\n", ast_getformatname(format));
01569    }
01570 
01571    return len;
01572 }

int ast_codec_get_samples ( struct ast_frame f  ) 

Returns the number of samples contained in the frame.

Definition at line 1496 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(), ast_frame::data, ast_frame::datalen, g723_samples(), LOG_WARNING, speex_samples(), and ast_frame::subclass.

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

01497 {
01498    int samples=0;
01499    switch(f->subclass) {
01500    case AST_FORMAT_SPEEX:
01501       samples = speex_samples(f->data, f->datalen);
01502       break;
01503    case AST_FORMAT_G723_1:
01504                 samples = g723_samples(f->data, f->datalen);
01505       break;
01506    case AST_FORMAT_ILBC:
01507       samples = 240 * (f->datalen / 50);
01508       break;
01509    case AST_FORMAT_GSM:
01510       samples = 160 * (f->datalen / 33);
01511       break;
01512    case AST_FORMAT_G729A:
01513       samples = f->datalen * 8;
01514       break;
01515    case AST_FORMAT_SLINEAR:
01516       samples = f->datalen / 2;
01517       break;
01518    case AST_FORMAT_LPC10:
01519                 /* assumes that the RTP packet contains one LPC10 frame */
01520       samples = 22 * 8;
01521       samples += (((char *)(f->data))[7] & 0x1) * 8;
01522       break;
01523    case AST_FORMAT_ULAW:
01524    case AST_FORMAT_ALAW:
01525       samples = f->datalen;
01526       break;
01527    case AST_FORMAT_G722:
01528    case AST_FORMAT_ADPCM:
01529    case AST_FORMAT_G726:
01530    case AST_FORMAT_G726_AAL2:
01531       samples = f->datalen * 2;
01532       break;
01533    default:
01534       ast_log(LOG_WARNING, "Unable to calculate samples for format %s\n", ast_getformatname(f->subclass));
01535    }
01536    return samples;
01537 }

int ast_codec_pref_append ( struct ast_codec_pref pref,
int  format 
)

Append codec to list.

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

Definition at line 1139 of file frame.c.

References ast_codec_pref_remove(), and ast_codec_pref::order.

Referenced by ast_parse_allow_disallow().

01140 {
01141    int x, newindex = 0;
01142 
01143    ast_codec_pref_remove(pref, format);
01144 
01145    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01146       if(AST_FORMAT_LIST[x].bits == format) {
01147          newindex = x + 1;
01148          break;
01149       }
01150    }
01151 
01152    if(newindex) {
01153       for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01154          if(!pref->order[x]) {
01155             pref->order[x] = newindex;
01156             break;
01157          }
01158       }
01159    }
01160 
01161    return x;
01162 }

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 1041 of file frame.c.

References ast_codec_pref::order.

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

01042 {
01043    int x, differential = (int) 'A', mem;
01044    char *from, *to;
01045 
01046    if(right) {
01047       from = pref->order;
01048       to = buf;
01049       mem = size;
01050    } else {
01051       to = pref->order;
01052       from = buf;
01053       mem = 32;
01054    }
01055 
01056    memset(to, 0, mem);
01057    for (x = 0; x < 32 ; x++) {
01058       if(!from[x])
01059          break;
01060       to[x] = right ? (from[x] + differential) : (from[x] - differential);
01061    }
01062 }

struct ast_format_list ast_codec_pref_getsize ( struct ast_codec_pref pref,
int  format 
) [read]

Get packet size for codec.

Definition at line 1241 of file frame.c.

References ast_format_list::bits, ast_format_list::cur_ms, ast_format_list::def_ms, format, ast_format_list::inc_ms, ast_format_list::max_ms, and ast_format_list::min_ms.

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

01242 {
01243    int x, index = -1, framems = 0;
01244    struct ast_format_list fmt = {0};
01245 
01246    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01247       if(AST_FORMAT_LIST[x].bits == format) {
01248          fmt = AST_FORMAT_LIST[x];
01249          index = x;
01250          break;
01251       }
01252    }
01253 
01254    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01255       if(pref->order[x] == (index + 1)) {
01256          framems = pref->framing[x];
01257          break;
01258       }
01259    }
01260 
01261    /* size validation */
01262    if(!framems)
01263       framems = AST_FORMAT_LIST[index].def_ms;
01264 
01265    if(AST_FORMAT_LIST[index].inc_ms && framems % AST_FORMAT_LIST[index].inc_ms) /* avoid division by zero */
01266       framems -= framems % AST_FORMAT_LIST[index].inc_ms;
01267 
01268    if(framems < AST_FORMAT_LIST[index].min_ms)
01269       framems = AST_FORMAT_LIST[index].min_ms;
01270 
01271    if(framems > AST_FORMAT_LIST[index].max_ms)
01272       framems = AST_FORMAT_LIST[index].max_ms;
01273 
01274    fmt.cur_ms = framems;
01275 
01276    return fmt;
01277 }

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 1099 of file frame.c.

References 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().

01100 {
01101    int slot = 0;
01102 
01103    
01104    if((index >= 0) && (index < sizeof(pref->order))) {
01105       slot = pref->order[index];
01106    }
01107 
01108    return slot ? AST_FORMAT_LIST[slot-1].bits : 0;
01109 }

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

Prepend codec to list.

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

Definition at line 1165 of file frame.c.

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

Referenced by create_addr().

01166 {
01167    int x, newindex = 0;
01168 
01169    /* First step is to get the codecs "index number" */
01170    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01171       if (AST_FORMAT_LIST[x].bits == format) {
01172          newindex = x + 1;
01173          break;
01174       }
01175    }
01176    /* Done if its unknown */
01177    if (!newindex)
01178       return;
01179 
01180    /* Now find any existing occurrence, or the end */
01181    for (x = 0; x < 32; x++) {
01182       if (!pref->order[x] || pref->order[x] == newindex)
01183          break;
01184    }
01185 
01186    if (only_if_existing && !pref->order[x])
01187       return;
01188 
01189    /* Move down to make space to insert - either all the way to the end,
01190       or as far as the existing location (which will be overwritten) */
01191    for (; x > 0; x--) {
01192       pref->order[x] = pref->order[x - 1];
01193       pref->framing[x] = pref->framing[x - 1];
01194    }
01195 
01196    /* And insert the new entry */
01197    pref->order[0] = newindex;
01198    pref->framing[0] = 0; /* ? */
01199 }

void ast_codec_pref_remove ( struct ast_codec_pref pref,
int  format 
)

Remove codec from pref list.

Remove audio a codec from a preference list.

Definition at line 1112 of file frame.c.

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

Referenced by ast_codec_pref_append(), and ast_parse_allow_disallow().

01113 {
01114    struct ast_codec_pref oldorder;
01115    int x, y = 0;
01116    int slot;
01117    int size;
01118 
01119    if(!pref->order[0])
01120       return;
01121 
01122    memcpy(&oldorder, pref, sizeof(oldorder));
01123    memset(pref, 0, sizeof(*pref));
01124 
01125    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01126       slot = oldorder.order[x];
01127       size = oldorder.framing[x];
01128       if(! slot)
01129          break;
01130       if(AST_FORMAT_LIST[slot-1].bits != format) {
01131          pref->order[y] = slot;
01132          pref->framing[y++] = size;
01133       }
01134    }
01135    
01136 }

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

Set packet size for codec.

Definition at line 1202 of file frame.c.

References ast_format_list::def_ms, ast_codec_pref::framing, ast_format_list::inc_ms, ast_format_list::max_ms, ast_format_list::min_ms, and ast_codec_pref::order.

Referenced by ast_parse_allow_disallow(), and process_sdp().

01203 {
01204    int x, index = -1;
01205 
01206    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01207       if(AST_FORMAT_LIST[x].bits == format) {
01208          index = x;
01209          break;
01210       }
01211    }
01212 
01213    if(index < 0)
01214       return -1;
01215 
01216    /* size validation */
01217    if(!framems)
01218       framems = AST_FORMAT_LIST[index].def_ms;
01219 
01220    if(AST_FORMAT_LIST[index].inc_ms && framems % AST_FORMAT_LIST[index].inc_ms) /* avoid division by zero */
01221       framems -= framems % AST_FORMAT_LIST[index].inc_ms;
01222 
01223    if(framems < AST_FORMAT_LIST[index].min_ms)
01224       framems = AST_FORMAT_LIST[index].min_ms;
01225 
01226    if(framems > AST_FORMAT_LIST[index].max_ms)
01227       framems = AST_FORMAT_LIST[index].max_ms;
01228 
01229 
01230    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01231       if(pref->order[x] == (index + 1)) {
01232          pref->framing[x] = framems;
01233          break;
01234       }
01235    }
01236 
01237    return x;
01238 }

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 1064 of file frame.c.

References ast_codec_pref_index(), and ast_getformatname().

Referenced by dump_prefs(), and socket_process().

01065 {
01066    int x, codec; 
01067    size_t total_len, slen;
01068    char *formatname;
01069    
01070    memset(buf,0,size);
01071    total_len = size;
01072    buf[0] = '(';
01073    total_len--;
01074    for(x = 0; x < 32 ; x++) {
01075       if(total_len <= 0)
01076          break;
01077       if(!(codec = ast_codec_pref_index(pref,x)))
01078          break;
01079       if((formatname = ast_getformatname(codec))) {
01080          slen = strlen(formatname);
01081          if(slen > total_len)
01082             break;
01083          strncat(buf, formatname, total_len - 1); /* safe */
01084          total_len -= slen;
01085       }
01086       if(total_len && x < 31 && ast_codec_pref_index(pref , x + 1)) {
01087          strncat(buf, "|", total_len - 1); /* safe */
01088          total_len--;
01089       }
01090    }
01091    if(total_len) {
01092       strncat(buf, ")", total_len - 1); /* safe */
01093       total_len--;
01094    }
01095 
01096    return size - total_len;
01097 }

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

Definition at line 571 of file frame.c.

Referenced by ast_getformatbyname().

00572 {
00573    int x;
00574 
00575    for (x = 0; x < sizeof(ast_codec_alias_table) / sizeof(ast_codec_alias_table[0]); x++) {
00576       if(!strcmp(in,ast_codec_alias_table[x].alias))
00577          return ast_codec_alias_table[x].realname;
00578    }
00579    return in;
00580 }

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 1574 of file frame.c.

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

Referenced by audiohook_read_frame_single(), and conf_run().

01575 {
01576    int count;
01577    short *fdata = f->data;
01578    short adjust_value = abs(adjustment);
01579 
01580    if ((f->frametype != AST_FRAME_VOICE) || (f->subclass != AST_FORMAT_SLINEAR))
01581       return -1;
01582 
01583    if (!adjustment)
01584       return 0;
01585 
01586    for (count = 0; count < f->samples; count++) {
01587       if (adjustment > 0) {
01588          ast_slinear_saturated_multiply(&fdata[count], &adjust_value);
01589       } else if (adjustment < 0) {
01590          ast_slinear_saturated_divide(&fdata[count], &adjust_value);
01591       }
01592    }
01593 
01594    return 0;
01595 }

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

Dump a frame for debugging purposes

Definition at line 754 of file frame.c.

References AST_CONTROL_ANSWER, AST_CONTROL_BUSY, AST_CONTROL_CONGESTION, AST_CONTROL_FLASH, AST_CONTROL_HANGUP, AST_CONTROL_OFFHOOK, AST_CONTROL_OPTION, AST_CONTROL_RADIO_KEY, AST_CONTROL_RADIO_UNKEY, AST_CONTROL_RING, AST_CONTROL_RINGING, AST_CONTROL_TAKEOFFHOOK, AST_CONTROL_WINK, 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, ast_frame::data, ast_frame::frametype, ast_frame::subclass, and term_color().

Referenced by __ast_read(), and ast_write().

00755 {
00756    const char noname[] = "unknown";
00757    char ftype[40] = "Unknown Frametype";
00758    char cft[80];
00759    char subclass[40] = "Unknown Subclass";
00760    char csub[80];
00761    char moreinfo[40] = "";
00762    char cn[60];
00763    char cp[40];
00764    char cmn[40];
00765 
00766    if (!name)
00767       name = noname;
00768 
00769 
00770    if (!f) {
00771       ast_verbose("%s [ %s (NULL) ] [%s]\n", 
00772          term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00773          term_color(cft, "HANGUP", COLOR_BRRED, COLOR_BLACK, sizeof(cft)), 
00774          term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00775       return;
00776    }
00777    /* XXX We should probably print one each of voice and video when the format changes XXX */
00778    if (f->frametype == AST_FRAME_VOICE)
00779       return;
00780    if (f->frametype == AST_FRAME_VIDEO)
00781       return;
00782    switch(f->frametype) {
00783    case AST_FRAME_DTMF_BEGIN:
00784       strcpy(ftype, "DTMF Begin");
00785       subclass[0] = f->subclass;
00786       subclass[1] = '\0';
00787       break;
00788    case AST_FRAME_DTMF_END:
00789       strcpy(ftype, "DTMF End");
00790       subclass[0] = f->subclass;
00791       subclass[1] = '\0';
00792       break;
00793    case AST_FRAME_CONTROL:
00794       strcpy(ftype, "Control");
00795       switch(f->subclass) {
00796       case AST_CONTROL_HANGUP:
00797          strcpy(subclass, "Hangup");
00798          break;
00799       case AST_CONTROL_RING:
00800          strcpy(subclass, "Ring");
00801          break;
00802       case AST_CONTROL_RINGING:
00803          strcpy(subclass, "Ringing");
00804          break;
00805       case AST_CONTROL_ANSWER:
00806          strcpy(subclass, "Answer");
00807          break;
00808       case AST_CONTROL_BUSY:
00809          strcpy(subclass, "Busy");
00810          break;
00811       case AST_CONTROL_TAKEOFFHOOK:
00812          strcpy(subclass, "Take Off Hook");
00813          break;
00814       case AST_CONTROL_OFFHOOK:
00815          strcpy(subclass, "Line Off Hook");
00816          break;
00817       case AST_CONTROL_CONGESTION:
00818          strcpy(subclass, "Congestion");
00819          break;
00820       case AST_CONTROL_FLASH:
00821          strcpy(subclass, "Flash");
00822          break;
00823       case AST_CONTROL_WINK:
00824          strcpy(subclass, "Wink");
00825          break;
00826       case AST_CONTROL_OPTION:
00827          strcpy(subclass, "Option");
00828          break;
00829       case AST_CONTROL_RADIO_KEY:
00830          strcpy(subclass, "Key Radio");
00831          break;
00832       case AST_CONTROL_RADIO_UNKEY:
00833          strcpy(subclass, "Unkey Radio");
00834          break;
00835       case -1:
00836          strcpy(subclass, "Stop generators");
00837          break;
00838       default:
00839          snprintf(subclass, sizeof(subclass), "Unknown control '%d'", f->subclass);
00840       }
00841       break;
00842    case AST_FRAME_NULL:
00843       strcpy(ftype, "Null Frame");
00844       strcpy(subclass, "N/A");
00845       break;
00846    case AST_FRAME_IAX:
00847       /* Should never happen */
00848       strcpy(ftype, "IAX Specific");
00849       snprintf(subclass, sizeof(subclass), "IAX Frametype %d", f->subclass);
00850       break;
00851    case AST_FRAME_TEXT:
00852       strcpy(ftype, "Text");
00853       strcpy(subclass, "N/A");
00854       ast_copy_string(moreinfo, f->data, sizeof(moreinfo));
00855       break;
00856    case AST_FRAME_IMAGE:
00857       strcpy(ftype, "Image");
00858       snprintf(subclass, sizeof(subclass), "Image format %s\n", ast_getformatname(f->subclass));
00859       break;
00860    case AST_FRAME_HTML:
00861       strcpy(ftype, "HTML");
00862       switch(f->subclass) {
00863       case AST_HTML_URL:
00864          strcpy(subclass, "URL");
00865          ast_copy_string(moreinfo, f->data, sizeof(moreinfo));
00866          break;
00867       case AST_HTML_DATA:
00868          strcpy(subclass, "Data");
00869          break;
00870       case AST_HTML_BEGIN:
00871          strcpy(subclass, "Begin");
00872          break;
00873       case AST_HTML_END:
00874          strcpy(subclass, "End");
00875          break;
00876       case AST_HTML_LDCOMPLETE:
00877          strcpy(subclass, "Load Complete");
00878          break;
00879       case AST_HTML_NOSUPPORT:
00880          strcpy(subclass, "No Support");
00881          break;
00882       case AST_HTML_LINKURL:
00883          strcpy(subclass, "Link URL");
00884          ast_copy_string(moreinfo, f->data, sizeof(moreinfo));
00885          break;
00886       case AST_HTML_UNLINK:
00887          strcpy(subclass, "Unlink");
00888          break;
00889       case AST_HTML_LINKREJECT:
00890          strcpy(subclass, "Link Reject");
00891          break;
00892       default:
00893          snprintf(subclass, sizeof(subclass), "Unknown HTML frame '%d'\n", f->subclass);
00894          break;
00895       }
00896       break;
00897    case AST_FRAME_MODEM:
00898       strcpy(ftype, "Modem");
00899       switch (f->subclass) {
00900       case AST_MODEM_T38:
00901          strcpy(subclass, "T.38");
00902          break;
00903       case AST_MODEM_V150:
00904          strcpy(subclass, "V.150");
00905          break;
00906       default:
00907          snprintf(subclass, sizeof(subclass), "Unknown MODEM frame '%d'\n", f->subclass);
00908          break;
00909       }
00910       break;
00911    default:
00912       snprintf(ftype, sizeof(ftype), "Unknown Frametype '%d'", f->frametype);
00913    }
00914    if (!ast_strlen_zero(moreinfo))
00915       ast_verbose("%s [ TYPE: %s (%d) SUBCLASS: %s (%d) '%s' ] [%s]\n",  
00916              term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00917              term_color(cft, ftype, COLOR_BRRED, COLOR_BLACK, sizeof(cft)),
00918              f->frametype, 
00919              term_color(csub, subclass, COLOR_BRCYAN, COLOR_BLACK, sizeof(csub)),
00920              f->subclass, 
00921              term_color(cmn, moreinfo, COLOR_BRGREEN, COLOR_BLACK, sizeof(cmn)),
00922              term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00923    else
00924       ast_verbose("%s [ TYPE: %s (%d) SUBCLASS: %s (%d) ] [%s]\n",  
00925              term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00926              term_color(cft, ftype, COLOR_BRRED, COLOR_BLACK, sizeof(cft)),
00927              f->frametype, 
00928              term_color(csub, subclass, COLOR_BRCYAN, COLOR_BLACK, sizeof(csub)),
00929              f->subclass, 
00930              term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00931 }

void ast_frame_free ( struct ast_frame fr,
int  cache 
)

Requests a frame to be allocated.

Parameters:
source Request a frame be allocated. source is an optional source of the frame, len is the requested length, or "0" if the caller will supply the buffer
Frees a frame
Parameters:
fr Frame to free
cache Whether to consider this frame for frame caching

Definition at line 321 of file frame.c.

References ast_dsp_frame_freed(), AST_FRFLAG_FROM_DSP, 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_translate_frame_freed(), ast_frame::data, FRAME_CACHE_MAX_SIZE, frames, free, ast_frame_cache::list, ast_frame::mallocd, ast_frame::offset, ast_frame_cache::size, and ast_frame::src.

Referenced by mixmonitor_thread().

00322 {
00323    if (ast_test_flag(fr, AST_FRFLAG_FROM_TRANSLATOR))
00324       ast_translate_frame_freed(fr);
00325    else if (ast_test_flag(fr, AST_FRFLAG_FROM_DSP))
00326       ast_dsp_frame_freed(fr);
00327 
00328    if (!fr->mallocd)
00329       return;
00330 
00331 #if !defined(LOW_MEMORY)
00332    if (cache && fr->mallocd == AST_MALLOCD_HDR) {
00333       /* Cool, only the header is malloc'd, let's just cache those for now 
00334        * to keep things simple... */
00335       struct ast_frame_cache *frames;
00336 
00337       if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames))) 
00338           && frames->size < FRAME_CACHE_MAX_SIZE) {
00339          AST_LIST_INSERT_HEAD(&frames->list, fr, frame_list);
00340          frames->size++;
00341          return;
00342       }
00343    }
00344 #endif
00345    
00346    if (fr->mallocd & AST_MALLOCD_DATA) {
00347       if (fr->data) 
00348          free(fr->data - fr->offset);
00349    }
00350    if (fr->mallocd & AST_MALLOCD_SRC) {
00351       if (fr->src)
00352          free((char *)fr->src);
00353    }
00354    if (fr->mallocd & AST_MALLOCD_HDR) {
00355 #ifdef TRACE_FRAMES
00356       AST_LIST_LOCK(&headerlist);
00357       headers--;
00358       AST_LIST_REMOVE(&headerlist, fr, frame_list);
00359       AST_LIST_UNLOCK(&headerlist);
00360 #endif         
00361       free(fr);
00362    }
00363 }

static struct ast_frame* ast_frame_header_new ( void   )  [static, read]

Definition at line 273 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, f, frames, ast_frame_cache::list, ast_frame::mallocd, ast_frame::mallocd_hdr_len, and ast_frame_cache::size.

Referenced by ast_frisolate().

00274 {
00275    struct ast_frame *f;
00276 
00277 #if !defined(LOW_MEMORY)
00278    struct ast_frame_cache *frames;
00279 
00280    if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames)))) {
00281       if ((f = AST_LIST_REMOVE_HEAD(&frames->list, frame_list))) {
00282          size_t mallocd_len = f->mallocd_hdr_len;
00283          memset(f, 0, sizeof(*f));
00284          f->mallocd_hdr_len = mallocd_len;
00285          f->mallocd = AST_MALLOCD_HDR;
00286          frames->size--;
00287          return f;
00288       }
00289    }
00290    if (!(f = ast_calloc_cache(1, sizeof(*f))))
00291       return NULL;
00292 #else
00293    if (!(f = ast_calloc(1, sizeof(*f))))
00294       return NULL;
00295 #endif
00296 
00297    f->mallocd_hdr_len = sizeof(*f);
00298 #ifdef TRACE_FRAMES
00299    AST_LIST_LOCK(&headerlist);
00300    headers++;
00301    AST_LIST_INSERT_HEAD(&headerlist, f, frame_list);
00302    AST_LIST_UNLOCK(&headerlist);
00303 #endif   
00304    
00305    return f;
00306 }

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 1597 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.

01598 {
01599    int count;
01600    short *data1, *data2;
01601 
01602    if ((f1->frametype != AST_FRAME_VOICE) || (f1->subclass != AST_FORMAT_SLINEAR))
01603       return -1;
01604 
01605    if ((f2->frametype != AST_FRAME_VOICE) || (f2->subclass != AST_FORMAT_SLINEAR))
01606       return -1;
01607 
01608    if (f1->samples != f2->samples)
01609       return -1;
01610 
01611    for (count = 0, data1 = f1->data, data2 = f2->data;
01612         count < f1->samples;
01613         count++, data1++, data2++)
01614       ast_slinear_saturated_add(data1, data2);
01615 
01616    return 0;
01617 }

struct ast_frame* ast_frdup ( const struct ast_frame fr  )  [read]

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 429 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_frame::data, ast_frame::datalen, ast_frame::delivery, frames, ast_frame::frametype, ast_frame::len, len, ast_frame_cache::list, ast_frame::mallocd, ast_frame::mallocd_hdr_len, ast_frame::offset, ast_frame::samples, ast_frame::seqno, ast_frame_cache::size, ast_frame::src, ast_frame::subclass, and ast_frame::ts.

Referenced by ast_jb_put(), ast_queue_frame(), ast_rtp_write(), ast_slinfactory_feed(), audiohook_read_frame_both(), audiohook_read_frame_single(), autoservice_run(), recordthread(), rpt(), and rpt_exec().

00430 {
00431    struct ast_frame *out = NULL;
00432    int len, srclen = 0;
00433    void *buf = NULL;
00434 
00435 #if !defined(LOW_MEMORY)
00436    struct ast_frame_cache *frames;
00437 #endif
00438 
00439    /* Start with standard stuff */
00440    len = sizeof(*out) + AST_FRIENDLY_OFFSET + f->datalen;
00441    /* If we have a source, add space for it */
00442    /*
00443     * XXX Watch out here - if we receive a src which is not terminated
00444     * properly, we can be easily attacked. Should limit the size we deal with.
00445     */
00446    if (f->src)
00447       srclen = strlen(f->src);
00448    if (srclen > 0)
00449       len += srclen + 1;
00450    
00451 #if !defined(LOW_MEMORY)
00452    if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames)))) {
00453       AST_LIST_TRAVERSE_SAFE_BEGIN(&frames->list, out, frame_list) {
00454          if (out->mallocd_hdr_len >= len) {
00455             size_t mallocd_len = out->mallocd_hdr_len;
00456             AST_LIST_REMOVE_CURRENT(&frames->list, frame_list);
00457             memset(out, 0, sizeof(*out));
00458             out->mallocd_hdr_len = mallocd_len;
00459             buf = out;
00460             frames->size--;
00461             break;
00462          }
00463       }
00464       AST_LIST_TRAVERSE_SAFE_END
00465    }
00466 #endif
00467 
00468    if (!buf) {
00469       if (!(buf = ast_calloc_cache(1, len)))
00470          return NULL;
00471       out = buf;
00472       out->mallocd_hdr_len = len;
00473    }
00474 
00475    out->frametype = f->frametype;
00476    out->subclass = f->subclass;
00477    out->datalen = f->datalen;
00478    out->samples = f->samples;
00479    out->delivery = f->delivery;
00480    /* Set us as having malloc'd header only, so it will eventually
00481       get freed. */
00482    out->mallocd = AST_MALLOCD_HDR;
00483    out->offset = AST_FRIENDLY_OFFSET;
00484    if (out->datalen) {
00485       out->data = buf + sizeof(*out) + AST_FRIENDLY_OFFSET;
00486       memcpy(out->data, f->data, out->datalen); 
00487    }
00488    if (srclen > 0) {
00489       out->src = buf + sizeof(*out) + AST_FRIENDLY_OFFSET + f->datalen;
00490       /* Must have space since we allocated for it */
00491       strcpy((char *)out->src, f->src);
00492    }
00493    ast_copy_flags(out, f, AST_FRFLAG_HAS_TIMING_INFO);
00494    out->ts = f->ts;
00495    out->len = f->len;
00496    out->seqno = f->seqno;
00497    return out;
00498 }

struct ast_frame* ast_frisolate ( struct ast_frame fr  )  [read]

'isolates' a frame by duplicating non-malloc'ed components (header, src, data). On return all components are malloc'ed

Makes a frame independent of any static storage.

Definition at line 370 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().

00371 {
00372    struct ast_frame *out;
00373    void *newdata;
00374 
00375    ast_clear_flag(fr, AST_FRFLAG_FROM_TRANSLATOR);
00376    ast_clear_flag(fr, AST_FRFLAG_FROM_DSP);
00377 
00378    if (!(fr->mallocd & AST_MALLOCD_HDR)) {
00379       /* Allocate a new header if needed */
00380       if (!(out = ast_frame_header_new()))
00381          return NULL;
00382       out->frametype = fr->frametype;
00383       out->subclass = fr->subclass;
00384       out->datalen = fr->datalen;
00385       out->samples = fr->samples;
00386       out->offset = fr->offset;
00387       out->data = fr->data;
00388       /* Copy the timing data */
00389       ast_copy_flags(out, fr, AST_FRFLAG_HAS_TIMING_INFO);
00390       if (ast_test_flag(fr, AST_FRFLAG_HAS_TIMING_INFO)) {
00391          out->ts = fr->ts;
00392          out->len = fr->len;
00393          out->seqno = fr->seqno;
00394       }
00395    } else
00396       out = fr;
00397    
00398    if (!(fr->mallocd & AST_MALLOCD_SRC)) {
00399       if (fr->src) {
00400          if (!(out->src = ast_strdup(fr->src))) {
00401             if (out != fr)
00402                free(out);
00403             return NULL;
00404          }
00405       }
00406    } else
00407       out->src = fr->src;
00408    
00409    if (!(fr->mallocd & AST_MALLOCD_DATA))  {
00410       if (!(newdata = ast_malloc(fr->datalen + AST_FRIENDLY_OFFSET))) {
00411          if (out->src != fr->src)
00412             free((void *) out->src);
00413          if (out != fr)
00414             free(out);
00415          return NULL;
00416       }
00417       newdata += AST_FRIENDLY_OFFSET;
00418       out->offset = AST_FRIENDLY_OFFSET;
00419       out->datalen = fr->datalen;
00420       memcpy(newdata, fr->data, fr->datalen);
00421       out->data = newdata;
00422    }
00423 
00424    out->mallocd = AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA;
00425    
00426    return out;
00427 }

struct ast_format_list* ast_get_format_list ( size_t *  size  )  [read]

Definition at line 516 of file frame.c.

00517 {
00518    *size = (sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]));
00519    return AST_FORMAT_LIST;
00520 }

struct ast_format_list* ast_get_format_list_index ( int  index  )  [read]

Definition at line 511 of file frame.c.

00512 {
00513    return &AST_FORMAT_LIST[index];
00514 }

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 582 of file frame.c.

References ast_expand_codec_alias(), ast_format_list::bits, and format.

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

00583 {
00584    int x, all, format = 0;
00585 
00586    all = strcasecmp(name, "all") ? 0 : 1;
00587    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
00588       if(AST_FORMAT_LIST[x].visible && (all || 
00589            !strcasecmp(AST_FORMAT_LIST[x].name,name) ||
00590            !strcasecmp(AST_FORMAT_LIST[x].name,ast_expand_codec_alias(name)))) {
00591          format |= AST_FORMAT_LIST[x].bits;
00592          if(!all)
00593             break;
00594       }
00595    }
00596 
00597    return format;
00598 }

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 522 of file frame.c.

References ast_format_list::bits, ast_format_list::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(), 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(), socket_process(), xagi_exec(), and zt_read().

00523 {
00524    int x;
00525    char *ret = "unknown";
00526    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
00527       if(AST_FORMAT_LIST[x].visible && AST_FORMAT_LIST[x].bits == format) {
00528          ret = AST_FORMAT_LIST[x].name;
00529          break;
00530       }
00531    }
00532    return ret;
00533 }

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 535 of file frame.c.

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

Referenced by __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_bridge(), iax2_show_peer(), process_sdp(), serialize_showchan(), sip_new(), sip_request_call(), sip_show_channel(), sip_show_settings(), and sip_write().

00536 {
00537    int x;
00538    unsigned len;
00539    char *start, *end = buf;
00540 
00541    if (!size)
00542       return buf;
00543    snprintf(end, size, "0x%x (", format);
00544    len = strlen(end);
00545    end += len;
00546    size -= len;
00547    start = end;
00548    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
00549       if (AST_FORMAT_LIST[x].visible && (AST_FORMAT_LIST[x].bits & format)) {
00550          snprintf(end, size,"%s|",AST_FORMAT_LIST[x].name);
00551          len = strlen(end);
00552          end += len;
00553          size -= len;
00554       }
00555    }
00556    if (start == end)
00557       snprintf(start, size, "nothing)");
00558    else if (size > 1)
00559       *(end -1) = ')';
00560    return buf;
00561 }

AST_LIST_HEAD_NOLOCK ( ast_frames  ,
ast_frame   
)

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

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 1303 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, parse(), and strsep().

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

01304 {
01305    char *parse = NULL, *this = NULL, *psize = NULL;
01306    int format = 0, framems = 0;
01307 
01308    parse = ast_strdupa(list);
01309    while ((this = strsep(&parse, ","))) {
01310       framems = 0;
01311       if ((psize = strrchr(this, ':'))) {
01312          *psize++ = '\0';
01313          if (option_debug)
01314             ast_log(LOG_DEBUG,"Packetization for codec: %s is %s\n", this, psize);
01315          framems = atoi(psize);
01316          if (framems < 0)
01317             framems = 0;
01318       }
01319       if (!(format = ast_getformatbyname(this))) {
01320          ast_log(LOG_WARNING, "Cannot %s unknown format '%s'\n", allowing ? "allow" : "disallow", this);
01321          continue;
01322       }
01323 
01324       if (mask) {
01325          if (allowing)
01326             *mask |= format;
01327          else
01328             *mask &= ~format;
01329       }
01330 
01331       /* Set up a preference list for audio. Do not include video in preferences 
01332          since we can not transcode video and have to use whatever is offered
01333        */
01334       if (pref && (format & AST_FORMAT_AUDIO_MASK)) {
01335          if (strcasecmp(this, "all")) {
01336             if (allowing) {
01337                ast_codec_pref_append(pref, format);
01338                ast_codec_pref_setsize(pref, format, framems);
01339             }
01340             else
01341                ast_codec_pref_remove(pref, format);
01342          } else if (!allowing) {
01343             memset(pref, 0, sizeof(*pref));
01344          }
01345       }
01346    }
01347 }

void ast_smoother_free ( struct ast_smoother s  ) 

Definition at line 268 of file frame.c.

References free.

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

00269 {
00270    free(s);
00271 }

int ast_smoother_get_flags ( struct ast_smoother s  ) 

Definition at line 157 of file frame.c.

References ast_smoother::flags.

00158 {
00159    return s->flags;
00160 }

struct ast_smoother* ast_smoother_new ( int  size  )  [read]

Definition at line 147 of file frame.c.

References ast_malloc, ast_smoother_reset(), and s.

Referenced by ast_rtp_write().

00148 {
00149    struct ast_smoother *s;
00150    if (size < 1)
00151       return NULL;
00152    if ((s = ast_malloc(sizeof(*s))))
00153       ast_smoother_reset(s, size);
00154    return s;
00155 }

struct ast_frame* ast_smoother_read ( struct ast_smoother s  )  [read]

Definition at line 218 of file frame.c.

References AST_FRAME_VOICE, AST_FRIENDLY_OFFSET, ast_log(), AST_SMOOTHER_FLAG_G729, ast_tvadd(), ast_smoother::data, ast_frame::data, ast_frame::datalen, ast_smoother::delivery, ast_frame::delivery, ast_smoother::f, ast_smoother::flags, ast_smoother::format, ast_smoother::framedata, ast_frame::frametype, ast_smoother::len, len, LOG_WARNING, ast_frame::offset, ast_smoother::opt, ast_frame::samples, ast_smoother::samplesperbyte, ast_smoother::size, and ast_frame::subclass.

Referenced by ast_rtp_write().

00219 {
00220    struct ast_frame *opt;
00221    int len;
00222 
00223    /* IF we have an optimization frame, send it */
00224    if (s->opt) {
00225       if (s->opt->offset < AST_FRIENDLY_OFFSET)
00226          ast_log(LOG_WARNING, "Returning a frame of inappropriate offset (%d).\n",
00227                      s->opt->offset);
00228       opt = s->opt;
00229       s->opt = NULL;
00230       return opt;
00231    }
00232 
00233    /* Make sure we have enough data */
00234    if (s->len < s->size) {
00235       /* Or, if this is a G.729 frame with VAD on it, send it immediately anyway */
00236       if (!((s->flags & AST_SMOOTHER_FLAG_G729) && (s->size % 10)))
00237          return NULL;
00238    }
00239    len = s->size;
00240    if (len > s->len)
00241       len = s->len;
00242    /* Make frame */
00243    s->f.frametype = AST_FRAME_VOICE;
00244    s->f.subclass = s->format;
00245    s->f.data = s->framedata + AST_FRIENDLY_OFFSET;
00246    s->f.offset = AST_FRIENDLY_OFFSET;
00247    s->f.datalen = len;
00248    /* Samples will be improper given VAD, but with VAD the concept really doesn't even exist */
00249    s->f.samples = len * s->samplesperbyte;   /* XXX rounding */
00250    s->f.delivery = s->delivery;
00251    /* Fill Data */
00252    memcpy(s->f.data, s->data, len);
00253    s->len -= len;
00254    /* Move remaining data to the front if applicable */
00255    if (s->len) {
00256       /* In principle this should all be fine because if we are sending
00257          G.729 VAD, the next timestamp will take over anyawy */
00258       memmove(s->data, s->data + len, s->len);
00259       if (!ast_tvzero(s->delivery)) {
00260          /* If we have delivery time, increment it, otherwise, leave it at 0 */
00261          s->delivery = ast_tvadd(s->delivery, ast_samp2tv(s->f.samples, 8000));
00262       }
00263    }
00264    /* Return frame */
00265    return &s->f;
00266 }

void ast_smoother_reset ( struct ast_smoother s,
int  size 
)

Definition at line 141 of file frame.c.

References ast_smoother::size.

Referenced by ast_smoother_new().

00142 {
00143    memset(s, 0, sizeof(*s));
00144    s->size = size;
00145 }

void ast_smoother_set_flags ( struct ast_smoother s,
int  flags 
)

Definition at line 162 of file frame.c.

References ast_smoother::flags.

Referenced by ast_rtp_write().

00163 {
00164    s->flags = flags;
00165 }

int ast_smoother_test_flag ( struct ast_smoother s,
int  flag 
)

Definition at line 167 of file frame.c.

References ast_smoother::flags.

Referenced by ast_rtp_write().

00168 {
00169    return (s->flags & flag);
00170 }

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

Definition at line 500 of file frame.c.

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

00501 {
00502    int i;
00503    unsigned short *dst_s = dst;
00504    const unsigned short *src_s = src;
00505 
00506    for (i = 0; i < samples; i++)
00507       dst_s[i] = (src_s[i]<<8) | (src_s[i]>>8);
00508 }

AST_THREADSTORAGE_CUSTOM ( frame_cache  ,
frame_cache_init  ,
frame_cache_cleanup   
)

A per-thread cache of frame headers.

static void frame_cache_cleanup ( void *  data  )  [static]

Definition at line 309 of file frame.c.

References AST_LIST_REMOVE_HEAD, f, frames, free, and ast_frame_cache::list.

00310 {
00311    struct ast_frame_cache *frames = data;
00312    struct ast_frame *f;
00313 
00314    while ((f = AST_LIST_REMOVE_HEAD(&frames->list, frame_list)))
00315       free(f);
00316    
00317    free(frames);
00318 }

static int g723_len ( unsigned char  buf  )  [static]

Definition at line 1349 of file frame.c.

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

Referenced by g723_samples().

01350 {
01351    enum frame_type type = buf & TYPE_MASK;
01352 
01353    switch(type) {
01354    case TYPE_DONTSEND:
01355       return 0;
01356       break;
01357    case TYPE_SILENCE:
01358       return 4;
01359       break;
01360    case TYPE_HIGH:
01361       return 24;
01362       break;
01363    case TYPE_LOW:
01364       return 20;
01365       break;
01366    default:
01367       ast_log(LOG_WARNING, "Badly encoded frame (%d)\n", type);
01368    }
01369    return -1;
01370 }

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

Definition at line 1372 of file frame.c.

References g723_len().

Referenced by ast_codec_get_samples().

01373 {
01374    int pos = 0;
01375    int samples = 0;
01376    int res;
01377    while(pos < maxlen) {
01378       res = g723_len(buf[pos]);
01379       if (res <= 0)
01380          break;
01381       samples += 240;
01382       pos += res;
01383    }
01384    return samples;
01385 }

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

Definition at line 1387 of file frame.c.

Referenced by speex_get_wb_sz_at(), and speex_samples().

01388 {
01389    int byte = bit / 8;       /* byte containing first bit */
01390    int rem = 8 - (bit % 8);  /* remaining bits in first byte */
01391    unsigned char ret = 0;
01392    
01393    if (n <= 0 || n > 8)
01394       return 0;
01395 
01396    if (rem < n) {
01397       ret = (data[byte] << (n - rem));
01398       ret |= (data[byte + 1] >> (8 - n + rem));
01399    } else {
01400       ret = (data[byte] >> (rem - n));
01401    }
01402 
01403    return (ret & (0xff >> (8 - n)));
01404 }

int init_framer ( void   ) 

Provided by frame.c

Definition at line 1035 of file frame.c.

References ast_cli_register_multiple().

Referenced by main().

01036 {
01037    ast_cli_register_multiple(my_clis, sizeof(my_clis) / sizeof(struct ast_cli_entry));
01038    return 0;   
01039 }

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

Definition at line 727 of file frame.c.

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

00728 {
00729    int codec, i, found=0;
00730 
00731    if (argc != 4)
00732       return RESULT_SHOWUSAGE;
00733 
00734    if (sscanf(argv[3],"%d",&codec) != 1)
00735       return RESULT_SHOWUSAGE;
00736 
00737    for (i = 0; i < 32; i++)
00738       if (codec & (1 << i)) {
00739          found = 1;
00740          ast_cli(fd, "%11u (1 << %2d)  %s\n",1 << i,i,ast_codec2str(1<<i));
00741       }
00742 
00743    if (!found)
00744       ast_cli(fd, "Codec %d not found\n", codec);
00745 
00746    return RESULT_SUCCESS;
00747 }

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

Definition at line 705 of file frame.c.

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

00706 {
00707    int codec, i, found=0;
00708 
00709    if (argc != 3)
00710       return RESULT_SHOWUSAGE;
00711 
00712    if (sscanf(argv[2],"%d",&codec) != 1)
00713       return RESULT_SHOWUSAGE;
00714 
00715    for (i = 0; i < 32; i++)
00716       if (codec & (1 << i)) {
00717          found = 1;
00718          ast_cli(fd, "%11u (1 << %2d)  %s\n",1 << i,i,ast_codec2str(1<<i));
00719       }
00720 
00721    if (!found)
00722       ast_cli(fd, "Codec %d not found\n", codec);
00723 
00724    return RESULT_SUCCESS;
00725 }

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

Definition at line 657 of file frame.c.

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

00658 {
00659    int i, found=0;
00660    char hex[25];
00661    
00662    if ((argc < 3) || (argc > 4))
00663       return RESULT_SHOWUSAGE;
00664 
00665    if (!ast_opt_dont_warn)
00666       ast_cli(fd, "Disclaimer: this command is for informational purposes only.\n"
00667             "\tIt does not indicate anything about your configuration.\n");
00668 
00669    ast_cli(fd, "%11s %9s %10s   TYPE   %8s   %s\n","INT","BINARY","HEX","NAME","DESC");
00670    ast_cli(fd, "--------------------------------------------------------------------------------\n");
00671    if ((argc == 3) || (!strcasecmp(argv[3],"audio"))) {
00672       found = 1;
00673       for (i=0;i<13;i++) {
00674          snprintf(hex,25,"(0x%x)",1<<i);
00675          ast_cli(fd, "%11u (1 << %2d) %10s  audio   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00676       }
00677    }
00678 
00679    if ((argc == 3) || (!strcasecmp(argv[3],"image"))) {
00680       found = 1;
00681       for (i=16;i<18;i++) {
00682          snprintf(hex,25,"(0x%x)",1<<i);
00683          ast_cli(fd, "%11u (1 << %2d) %10s  image   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00684       }
00685    }
00686 
00687    if ((argc == 3) || (!strcasecmp(argv[3],"video"))) {
00688       found = 1;
00689       for (i=18;i<22;i++) {
00690          snprintf(hex,25,"(0x%x)",1<<i);
00691          ast_cli(fd, "%11u (1 << %2d) %10s  video   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00692       }
00693    }
00694 
00695    if (! found)
00696       return RESULT_SHOWUSAGE;
00697    else
00698       return RESULT_SUCCESS;
00699 }

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

Definition at line 613 of file frame.c.

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

00614 {
00615    int i, found=0;
00616    char hex[25];
00617    
00618    if ((argc < 2) || (argc > 3))
00619       return RESULT_SHOWUSAGE;
00620 
00621    if (!ast_opt_dont_warn)
00622       ast_cli(fd, "Disclaimer: this command is for informational purposes only.\n"
00623             "\tIt does not indicate anything about your configuration.\n");
00624 
00625    ast_cli(fd, "%11s %9s %10s   TYPE   %8s   %s\n","INT","BINARY","HEX","NAME","DESC");
00626    ast_cli(fd, "--------------------------------------------------------------------------------\n");
00627    if ((argc == 2) || (!strcasecmp(argv[1],"audio"))) {
00628       found = 1;
00629       for (i=0;i<13;i++) {
00630          snprintf(hex,25,"(0x%x)",1<<i);
00631          ast_cli(fd, "%11u (1 << %2d) %10s  audio   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00632       }
00633    }
00634 
00635    if ((argc == 2) || (!strcasecmp(argv[1],"image"))) {
00636       found = 1;
00637       for (i=16;i<18;i++) {
00638          snprintf(hex,25,"(0x%x)",1<<i);
00639          ast_cli(fd, "%11u (1 << %2d) %10s  image   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00640       }
00641    }
00642 
00643    if ((argc == 2) || (!strcasecmp(argv[1],"video"))) {
00644       found = 1;
00645       for (i=18;i<22;i++) {
00646          snprintf(hex,25,"(0x%x)",1<<i);
00647          ast_cli(fd, "%11u (1 << %2d) %10s  video   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00648       }
00649    }
00650 
00651    if (! found)
00652       return RESULT_SHOWUSAGE;
00653    else
00654       return RESULT_SUCCESS;
00655 }

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

Definition at line 1406 of file frame.c.

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

Referenced by speex_samples().

01407 {
01408    static int SpeexWBSubModeSz[] = {
01409       0, 36, 112, 192,
01410       352, 0, 0, 0 };
01411    int off = bit;
01412    unsigned char c;
01413 
01414    /* skip up to two wideband frames */
01415    if (((len * 8 - off) >= 5) && 
01416       get_n_bits_at(data, 1, off)) {
01417       c = get_n_bits_at(data, 3, off + 1);
01418       off += SpeexWBSubModeSz[c];
01419 
01420       if (((len * 8 - off) >= 5) && 
01421          get_n_bits_at(data, 1, off)) {
01422          c = get_n_bits_at(data, 3, off + 1);
01423          off += SpeexWBSubModeSz[c];
01424 
01425          if (((len * 8 - off) >= 5) && 
01426             get_n_bits_at(data, 1, off)) {
01427             ast_log(LOG_WARNING, "Encountered corrupt speex frame; too many wideband frames in a row.\n");
01428             return -1;
01429          }
01430       }
01431 
01432    }
01433    return off - bit;
01434 }

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

Definition at line 1436 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().

01437 {
01438    static int SpeexSubModeSz[] = {
01439                5, 43, 119, 160,
01440       220, 300, 364, 492, 
01441       79, 0, 0, 0,
01442       0, 0, 0, 0 };
01443    static int SpeexInBandSz[] = { 
01444       1, 1, 4, 4,
01445       4, 4, 4, 4,
01446       8, 8, 16, 16,
01447       32, 32, 64, 64 };
01448    int bit = 0;
01449    int cnt = 0;
01450    int off;
01451    unsigned char c;
01452 
01453    while ((len * 8 - bit) >= 5) {
01454       /* skip wideband frames */
01455       off = speex_get_wb_sz_at(data, len, bit);
01456       if (off < 0)  {
01457          ast_log(LOG_WARNING, "Had error while reading wideband frames for speex samples\n");
01458          break;
01459       }
01460       bit += off;
01461 
01462       if ((len * 8 - bit) < 5) {
01463          ast_log(LOG_WARNING, "Not enough bits remaining after wide band for speex samples.\n");
01464          break;
01465       }
01466 
01467       /* get control bits */
01468       c = get_n_bits_at(data, 5, bit);
01469       bit += 5;
01470 
01471       if (c == 15) { 
01472          /* terminator */
01473          break; 
01474       } else if (c == 14) {
01475          /* in-band signal; next 4 bits contain signal id */
01476          c = get_n_bits_at(data, 4, bit);
01477          bit += 4;
01478          bit += SpeexInBandSz[c];
01479       } else if (c == 13) {
01480          /* user in-band; next 5 bits contain msg len */
01481          c = get_n_bits_at(data, 5, bit);
01482          bit += 5;
01483          bit += c * 8;
01484       } else if (c > 8) {
01485          /* unknown */
01486          break;
01487       } else {
01488          /* skip number bits for submode (less the 5 control bits) */
01489          bit += SpeexSubModeSz[c] - 5;
01490          cnt += 160; /* new frame */
01491       }
01492    }
01493    return cnt;
01494 }


Variable Documentation

struct ast_format_list AST_FORMAT_LIST[] [static]

Definition of supported media formats (codecs).

Definition at line 108 of file frame.c.

struct ast_frame ast_null_frame = { AST_FRAME_NULL, }

Initial value:

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

Definition at line 980 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 995 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 975 of file frame.c.

Initial value:

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

Definition at line 990 of file frame.c.

Initial value:

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

Definition at line 985 of file frame.c.

char frame_show_codec_n_usage[] [static]

Initial value:

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

Definition at line 749 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 701 of file frame.c.

struct ast_cli_entry my_clis[] [static]

Definition at line 1007 of file frame.c.


Generated on Tue Sep 30 01:19:57 2008 for Asterisk - the Open Source PBX by  doxygen 1.5.6