Fri Jun 19 12:10:35 2009

Asterisk developer's documentation


frame.c File Reference

Frame and codec manipulation routines. More...

#include "asterisk.h"
#include "asterisk/_private.h"
#include "asterisk/lock.h"
#include "asterisk/frame.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)
static void __init_frame_cache (void)
 A per-thread cache of frame headers.
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 idx)
 Codec located at a particular place in the preference index.
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 idx)
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.
int 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_reconfigure (struct ast_smoother *s, int bytes)
 Reconfigure an existing smoother to output a different number of bytes per frame.
void ast_smoother_reset (struct ast_smoother *s, int bytes)
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 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 char * show_codec_n (struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
static char * show_codecs (struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
static int smoother_frame_feed (struct ast_smoother *s, struct ast_frame *f, int swap)
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_threadstorage frame_cache = { .once = PTHREAD_ONCE_INIT, .key_init = __init_frame_cache , .custom_init = NULL , }
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 63 of file frame.c.

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

#define SMOOTHER_SIZE   8000

Definition at line 75 of file frame.c.

Referenced by __ast_smoother_feed().

#define TYPE_MASK   0x3

Definition at line 84 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 77 of file frame.c.

00077                 {
00078    TYPE_HIGH,     /* 0x0 */
00079    TYPE_LOW,      /* 0x1 */
00080    TYPE_SILENCE,  /* 0x2 */
00081    TYPE_DONTSEND  /* 0x3 */
00082 };


Function Documentation

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

Definition at line 204 of file frame.c.

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

00205 {
00206    if (f->frametype != AST_FRAME_VOICE) {
00207       ast_log(LOG_WARNING, "Huh?  Can't smooth a non-voice frame!\n");
00208       return -1;
00209    }
00210    if (!s->format) {
00211       s->format = f->subclass;
00212       s->samplesperbyte = (float)f->samples / (float)f->datalen;
00213    } else if (s->format != f->subclass) {
00214       ast_log(LOG_WARNING, "Smoother was working on %d format frames, now trying to feed %d?\n", s->format, f->subclass);
00215       return -1;
00216    }
00217    if (s->len + f->datalen > SMOOTHER_SIZE) {
00218       ast_log(LOG_WARNING, "Out of smoother space\n");
00219       return -1;
00220    }
00221    if (((f->datalen == s->size) ||
00222         ((f->datalen < 10) && (s->flags & AST_SMOOTHER_FLAG_G729))) &&
00223        !s->opt &&
00224        !s->len &&
00225        (f->offset >= AST_MIN_OFFSET)) {
00226       /* Optimize by sending the frame we just got
00227          on the next read, thus eliminating the douple
00228          copy */
00229       if (swap)
00230          ast_swapcopy_samples(f->data.ptr, f->data.ptr, f->samples);
00231       s->opt = f;
00232       s->opt_needs_swap = swap ? 1 : 0;
00233       return 0;
00234    }
00235 
00236    return smoother_frame_feed(s, f, swap);
00237 }

static void __init_frame_cache ( void   )  [static]

A per-thread cache of frame headers.

Definition at line 52 of file frame.c.

00069 {

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 631 of file frame.c.

References ARRAY_LEN, AST_FORMAT_LIST, and ast_format_list::desc.

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

00632 {
00633    int x;
00634    char *ret = "unknown";
00635    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00636       if (AST_FORMAT_LIST[x].bits == codec) {
00637          ret = AST_FORMAT_LIST[x].desc;
00638          break;
00639       }
00640    }
00641    return ret;
00642 }

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 1221 of file frame.c.

References ARRAY_LEN, ast_best_codec(), ast_debug, AST_FORMAT_AUDIO_MASK, AST_FORMAT_LIST, ast_format_list::bits, and ast_codec_pref::order.

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

01222 {
01223    int x, ret = 0, slot;
01224 
01225    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01226       slot = pref->order[x];
01227 
01228       if (!slot)
01229          break;
01230       if (formats & AST_FORMAT_LIST[slot-1].bits) {
01231          ret = AST_FORMAT_LIST[slot-1].bits;
01232          break;
01233       }
01234    }
01235    if (ret & AST_FORMAT_AUDIO_MASK)
01236       return ret;
01237 
01238    ast_debug(4, "Could not find preferred codec - %s\n", find_best ? "Going for the best codec" : "Returning zero codec");
01239 
01240       return find_best ? ast_best_codec(formats) : 0;
01241 }

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 1485 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_SLINEAR, AST_FORMAT_SLINEAR16, AST_FORMAT_ULAW, ast_getformatname(), ast_log(), len(), and LOG_WARNING.

Referenced by moh_generate(), and monmp3thread().

01486 {
01487    int len = 0;
01488 
01489    /* XXX Still need speex, g723, and lpc10 XXX */ 
01490    switch(format) {
01491    case AST_FORMAT_G723_1:
01492       len = (samples / 240) * 20;
01493       break;
01494    case AST_FORMAT_ILBC:
01495       len = (samples / 240) * 50;
01496       break;
01497    case AST_FORMAT_GSM:
01498       len = (samples / 160) * 33;
01499       break;
01500    case AST_FORMAT_G729A:
01501       len = samples / 8;
01502       break;
01503    case AST_FORMAT_SLINEAR:
01504    case AST_FORMAT_SLINEAR16:
01505       len = samples * 2;
01506       break;
01507    case AST_FORMAT_ULAW:
01508    case AST_FORMAT_ALAW:
01509       len = samples;
01510       break;
01511    case AST_FORMAT_G722:
01512    case AST_FORMAT_ADPCM:
01513    case AST_FORMAT_G726:
01514    case AST_FORMAT_G726_AAL2:
01515       len = samples / 2;
01516       break;
01517    default:
01518       ast_log(LOG_WARNING, "Unable to calculate sample length for format %s\n", ast_getformatname(format));
01519    }
01520 
01521    return len;
01522 }

int ast_codec_get_samples ( struct ast_frame f  ) 

Returns the number of samples contained in the frame.

Definition at line 1441 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_SLINEAR16, 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(), socket_process(), and socket_process_meta().

01442 {
01443    int samples=0;
01444    switch(f->subclass) {
01445    case AST_FORMAT_SPEEX:
01446       samples = speex_samples(f->data.ptr, f->datalen);
01447       break;
01448    case AST_FORMAT_G723_1:
01449       samples = g723_samples(f->data.ptr, f->datalen);
01450       break;
01451    case AST_FORMAT_ILBC:
01452       samples = 240 * (f->datalen / 50);
01453       break;
01454    case AST_FORMAT_GSM:
01455       samples = 160 * (f->datalen / 33);
01456       break;
01457    case AST_FORMAT_G729A:
01458       samples = f->datalen * 8;
01459       break;
01460    case AST_FORMAT_SLINEAR:
01461    case AST_FORMAT_SLINEAR16:
01462       samples = f->datalen / 2;
01463       break;
01464    case AST_FORMAT_LPC10:
01465       /* assumes that the RTP packet contains one LPC10 frame */
01466       samples = 22 * 8;
01467       samples += (((char *)(f->data.ptr))[7] & 0x1) * 8;
01468       break;
01469    case AST_FORMAT_ULAW:
01470    case AST_FORMAT_ALAW:
01471       samples = f->datalen;
01472       break;
01473    case AST_FORMAT_G722:
01474    case AST_FORMAT_ADPCM:
01475    case AST_FORMAT_G726:
01476    case AST_FORMAT_G726_AAL2:
01477       samples = f->datalen * 2;
01478       break;
01479    default:
01480       ast_log(LOG_WARNING, "Unable to calculate samples for format %s\n", ast_getformatname(f->subclass));
01481    }
01482    return samples;
01483 }

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 1081 of file frame.c.

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

Referenced by ast_parse_allow_disallow().

01082 {
01083    int x, newindex = 0;
01084 
01085    ast_codec_pref_remove(pref, format);
01086 
01087    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01088       if (AST_FORMAT_LIST[x].bits == format) {
01089          newindex = x + 1;
01090          break;
01091       }
01092    }
01093 
01094    if (newindex) {
01095       for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01096          if (!pref->order[x]) {
01097             pref->order[x] = newindex;
01098             break;
01099          }
01100       }
01101    }
01102 
01103    return x;
01104 }

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 984 of file frame.c.

References ast_codec_pref::order.

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

00985 {
00986    int x, differential = (int) 'A', mem;
00987    char *from, *to;
00988 
00989    if (right) {
00990       from = pref->order;
00991       to = buf;
00992       mem = size;
00993    } else {
00994       to = pref->order;
00995       from = buf;
00996       mem = 32;
00997    }
00998 
00999    memset(to, 0, mem);
01000    for (x = 0; x < 32 ; x++) {
01001       if (!from[x])
01002          break;
01003       to[x] = right ? (from[x] + differential) : (from[x] - differential);
01004    }
01005 }

struct ast_format_list ast_codec_pref_getsize ( struct ast_codec_pref pref,
int  format 
)

Get packet size for codec.

Definition at line 1182 of file frame.c.

References ARRAY_LEN, AST_FORMAT_LIST, 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_codec_setpref(), ast_rtp_write(), handle_open_receive_channel_ack_message(), skinny_set_rtp_peer(), and transmit_connect().

01183 {
01184    int x, idx = -1, framems = 0;
01185    struct ast_format_list fmt = { 0, };
01186 
01187    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01188       if (AST_FORMAT_LIST[x].bits == format) {
01189          fmt = AST_FORMAT_LIST[x];
01190          idx = x;
01191          break;
01192       }
01193    }
01194 
01195    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01196       if (pref->order[x] == (idx + 1)) {
01197          framems = pref->framing[x];
01198          break;
01199       }
01200    }
01201 
01202    /* size validation */
01203    if (!framems)
01204       framems = AST_FORMAT_LIST[idx].def_ms;
01205 
01206    if (AST_FORMAT_LIST[idx].inc_ms && framems % AST_FORMAT_LIST[idx].inc_ms) /* avoid division by zero */
01207       framems -= framems % AST_FORMAT_LIST[idx].inc_ms;
01208 
01209    if (framems < AST_FORMAT_LIST[idx].min_ms)
01210       framems = AST_FORMAT_LIST[idx].min_ms;
01211 
01212    if (framems > AST_FORMAT_LIST[idx].max_ms)
01213       framems = AST_FORMAT_LIST[idx].max_ms;
01214 
01215    fmt.cur_ms = framems;
01216 
01217    return fmt;
01218 }

int ast_codec_pref_index ( struct ast_codec_pref pref,
int  index 
)

Codec located at a particular place in the preference index.

Definition at line 1042 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(), handle_cli_iax2_show_peer(), jingle_accept_call(), print_codec_to_cli(), and socket_process().

01043 {
01044    int slot = 0;
01045 
01046    if ((idx >= 0) && (idx < sizeof(pref->order))) {
01047       slot = pref->order[idx];
01048    }
01049 
01050    return slot ? AST_FORMAT_LIST[slot - 1].bits : 0;
01051 }

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 1107 of file frame.c.

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

Referenced by create_addr().

01108 {
01109    int x, newindex = 0;
01110 
01111    /* First step is to get the codecs "index number" */
01112    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01113       if (AST_FORMAT_LIST[x].bits == format) {
01114          newindex = x + 1;
01115          break;
01116       }
01117    }
01118    /* Done if its unknown */
01119    if (!newindex)
01120       return;
01121 
01122    /* Now find any existing occurrence, or the end */
01123    for (x = 0; x < 32; x++) {
01124       if (!pref->order[x] || pref->order[x] == newindex)
01125          break;
01126    }
01127 
01128    if (only_if_existing && !pref->order[x])
01129       return;
01130 
01131    /* Move down to make space to insert - either all the way to the end,
01132       or as far as the existing location (which will be overwritten) */
01133    for (; x > 0; x--) {
01134       pref->order[x] = pref->order[x - 1];
01135       pref->framing[x] = pref->framing[x - 1];
01136    }
01137 
01138    /* And insert the new entry */
01139    pref->order[0] = newindex;
01140    pref->framing[0] = 0; /* ? */
01141 }

void ast_codec_pref_remove ( struct ast_codec_pref pref,
int  format 
)

Remove audio a codec from a preference list.

Definition at line 1054 of file frame.c.

References ARRAY_LEN, AST_FORMAT_LIST, and ast_codec_pref::order.

Referenced by ast_codec_pref_append(), and ast_parse_allow_disallow().

01055 {
01056    struct ast_codec_pref oldorder;
01057    int x, y = 0;
01058    int slot;
01059    int size;
01060 
01061    if (!pref->order[0])
01062       return;
01063 
01064    memcpy(&oldorder, pref, sizeof(oldorder));
01065    memset(pref, 0, sizeof(*pref));
01066 
01067    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01068       slot = oldorder.order[x];
01069       size = oldorder.framing[x];
01070       if (! slot)
01071          break;
01072       if (AST_FORMAT_LIST[slot-1].bits != format) {
01073          pref->order[y] = slot;
01074          pref->framing[y++] = size;
01075       }
01076    }
01077    
01078 }

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

Set packet size for codec.

Definition at line 1144 of file frame.c.

References ARRAY_LEN, AST_FORMAT_LIST, 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().

01145 {
01146    int x, idx = -1;
01147 
01148    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01149       if (AST_FORMAT_LIST[x].bits == format) {
01150          idx = x;
01151          break;
01152       }
01153    }
01154 
01155    if (idx < 0)
01156       return -1;
01157 
01158    /* size validation */
01159    if (!framems)
01160       framems = AST_FORMAT_LIST[idx].def_ms;
01161 
01162    if (AST_FORMAT_LIST[idx].inc_ms && framems % AST_FORMAT_LIST[idx].inc_ms) /* avoid division by zero */
01163       framems -= framems % AST_FORMAT_LIST[idx].inc_ms;
01164 
01165    if (framems < AST_FORMAT_LIST[idx].min_ms)
01166       framems = AST_FORMAT_LIST[idx].min_ms;
01167 
01168    if (framems > AST_FORMAT_LIST[idx].max_ms)
01169       framems = AST_FORMAT_LIST[idx].max_ms;
01170 
01171    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01172       if (pref->order[x] == (idx + 1)) {
01173          pref->framing[x] = framems;
01174          break;
01175       }
01176    }
01177 
01178    return x;
01179 }

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 1007 of file frame.c.

References ast_codec_pref_index(), and ast_getformatname().

Referenced by dump_prefs(), and socket_process().

01008 {
01009    int x, codec; 
01010    size_t total_len, slen;
01011    char *formatname;
01012    
01013    memset(buf,0,size);
01014    total_len = size;
01015    buf[0] = '(';
01016    total_len--;
01017    for(x = 0; x < 32 ; x++) {
01018       if (total_len <= 0)
01019          break;
01020       if (!(codec = ast_codec_pref_index(pref,x)))
01021          break;
01022       if ((formatname = ast_getformatname(codec))) {
01023          slen = strlen(formatname);
01024          if (slen > total_len)
01025             break;
01026          strncat(buf, formatname, total_len - 1); /* safe */
01027          total_len -= slen;
01028       }
01029       if (total_len && x < 31 && ast_codec_pref_index(pref , x + 1)) {
01030          strncat(buf, "|", total_len - 1); /* safe */
01031          total_len--;
01032       }
01033    }
01034    if (total_len) {
01035       strncat(buf, ")", total_len - 1); /* safe */
01036       total_len--;
01037    }
01038 
01039    return size - total_len;
01040 }

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

Definition at line 602 of file frame.c.

References ARRAY_LEN.

Referenced by ast_getformatbyname().

00603 {
00604    int x;
00605 
00606    for (x = 0; x < ARRAY_LEN(ast_codec_alias_table); x++) {
00607       if (!strcmp(in,ast_codec_alias_table[x].alias))
00608          return ast_codec_alias_table[x].realname;
00609    }
00610    return in;
00611 }

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 1524 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(), audiohook_volume_callback(), conf_run(), and volume_callback().

01525 {
01526    int count;
01527    short *fdata = f->data.ptr;
01528    short adjust_value = abs(adjustment);
01529 
01530    if ((f->frametype != AST_FRAME_VOICE) || (f->subclass != AST_FORMAT_SLINEAR))
01531       return -1;
01532 
01533    if (!adjustment)
01534       return 0;
01535 
01536    for (count = 0; count < f->samples; count++) {
01537       if (adjustment > 0) {
01538          ast_slinear_saturated_multiply(&fdata[count], &adjust_value);
01539       } else if (adjustment < 0) {
01540          ast_slinear_saturated_divide(&fdata[count], &adjust_value);
01541       }
01542    }
01543 
01544    return 0;
01545 }

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

Dump a frame for debugging purposes

Definition at line 733 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_RADIO_KEY, AST_CONTROL_RADIO_UNKEY, AST_CONTROL_RING, AST_CONTROL_RINGING, AST_CONTROL_T38, 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_T38_NEGOTIATED, AST_T38_REFUSED, AST_T38_REQUEST_NEGOTIATE, AST_T38_REQUEST_TERMINATE, AST_T38_TERMINATED, 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().

00734 {
00735    const char noname[] = "unknown";
00736    char ftype[40] = "Unknown Frametype";
00737    char cft[80];
00738    char subclass[40] = "Unknown Subclass";
00739    char csub[80];
00740    char moreinfo[40] = "";
00741    char cn[60];
00742    char cp[40];
00743    char cmn[40];
00744    const char *message = "Unknown";
00745 
00746    if (!name)
00747       name = noname;
00748 
00749 
00750    if (!f) {
00751       ast_verbose("%s [ %s (NULL) ] [%s]\n", 
00752          term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00753          term_color(cft, "HANGUP", COLOR_BRRED, COLOR_BLACK, sizeof(cft)), 
00754          term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00755       return;
00756    }
00757    /* XXX We should probably print one each of voice and video when the format changes XXX */
00758    if (f->frametype == AST_FRAME_VOICE)
00759       return;
00760    if (f->frametype == AST_FRAME_VIDEO)
00761       return;
00762    switch(f->frametype) {
00763    case AST_FRAME_DTMF_BEGIN:
00764       strcpy(ftype, "DTMF Begin");
00765       subclass[0] = f->subclass;
00766       subclass[1] = '\0';
00767       break;
00768    case AST_FRAME_DTMF_END:
00769       strcpy(ftype, "DTMF End");
00770       subclass[0] = f->subclass;
00771       subclass[1] = '\0';
00772       break;
00773    case AST_FRAME_CONTROL:
00774       strcpy(ftype, "Control");
00775       switch(f->subclass) {
00776       case AST_CONTROL_HANGUP:
00777          strcpy(subclass, "Hangup");
00778          break;
00779       case AST_CONTROL_RING:
00780          strcpy(subclass, "Ring");
00781          break;
00782       case AST_CONTROL_RINGING:
00783          strcpy(subclass, "Ringing");
00784          break;
00785       case AST_CONTROL_ANSWER:
00786          strcpy(subclass, "Answer");
00787          break;
00788       case AST_CONTROL_BUSY:
00789          strcpy(subclass, "Busy");
00790          break;
00791       case AST_CONTROL_TAKEOFFHOOK:
00792          strcpy(subclass, "Take Off Hook");
00793          break;
00794       case AST_CONTROL_OFFHOOK:
00795          strcpy(subclass, "Line Off Hook");
00796          break;
00797       case AST_CONTROL_CONGESTION:
00798          strcpy(subclass, "Congestion");
00799          break;
00800       case AST_CONTROL_FLASH:
00801          strcpy(subclass, "Flash");
00802          break;
00803       case AST_CONTROL_WINK:
00804          strcpy(subclass, "Wink");
00805          break;
00806       case AST_CONTROL_OPTION:
00807          strcpy(subclass, "Option");
00808          break;
00809       case AST_CONTROL_RADIO_KEY:
00810          strcpy(subclass, "Key Radio");
00811          break;
00812       case AST_CONTROL_RADIO_UNKEY:
00813          strcpy(subclass, "Unkey Radio");
00814          break;
00815       case AST_CONTROL_HOLD:
00816          strcpy(subclass, "Hold");
00817          break;
00818       case AST_CONTROL_UNHOLD:
00819          strcpy(subclass, "Unhold");
00820          break;
00821       case AST_CONTROL_T38:
00822          if (f->datalen != sizeof(enum ast_control_t38)) {
00823             message = "Invalid";
00824          } else {
00825             enum ast_control_t38 state = *((enum ast_control_t38 *) f->data.ptr);
00826             if (state == AST_T38_REQUEST_NEGOTIATE)
00827                message = "Negotiation Requested";
00828             else if (state == AST_T38_REQUEST_TERMINATE)
00829                message = "Negotiation Request Terminated";
00830             else if (state == AST_T38_NEGOTIATED)
00831                message = "Negotiated";
00832             else if (state == AST_T38_TERMINATED)
00833                message = "Terminated";
00834             else if (state == AST_T38_REFUSED)
00835                message = "Refused";
00836          }
00837          snprintf(subclass, sizeof(subclass), "T38/%s", message);
00838          break;
00839       case -1:
00840          strcpy(subclass, "Stop generators");
00841          break;
00842       default:
00843          snprintf(subclass, sizeof(subclass), "Unknown control '%d'", f->subclass);
00844       }
00845       break;
00846    case AST_FRAME_NULL:
00847       strcpy(ftype, "Null Frame");
00848       strcpy(subclass, "N/A");
00849       break;
00850    case AST_FRAME_IAX:
00851       /* Should never happen */
00852       strcpy(ftype, "IAX Specific");
00853       snprintf(subclass, sizeof(subclass), "IAX Frametype %d", f->subclass);
00854       break;
00855    case AST_FRAME_TEXT:
00856       strcpy(ftype, "Text");
00857       strcpy(subclass, "N/A");
00858       ast_copy_string(moreinfo, f->data.ptr, sizeof(moreinfo));
00859       break;
00860    case AST_FRAME_IMAGE:
00861       strcpy(ftype, "Image");
00862       snprintf(subclass, sizeof(subclass), "Image format %s\n", ast_getformatname(f->subclass));
00863       break;
00864    case AST_FRAME_HTML:
00865       strcpy(ftype, "HTML");
00866       switch(f->subclass) {
00867       case AST_HTML_URL:
00868          strcpy(subclass, "URL");
00869          ast_copy_string(moreinfo, f->data.ptr, sizeof(moreinfo));
00870          break;
00871       case AST_HTML_DATA:
00872          strcpy(subclass, "Data");
00873          break;
00874       case AST_HTML_BEGIN:
00875          strcpy(subclass, "Begin");
00876          break;
00877       case AST_HTML_END:
00878          strcpy(subclass, "End");
00879          break;
00880       case AST_HTML_LDCOMPLETE:
00881          strcpy(subclass, "Load Complete");
00882          break;
00883       case AST_HTML_NOSUPPORT:
00884          strcpy(subclass, "No Support");
00885          break;
00886       case AST_HTML_LINKURL:
00887          strcpy(subclass, "Link URL");
00888          ast_copy_string(moreinfo, f->data.ptr, sizeof(moreinfo));
00889          break;
00890       case AST_HTML_UNLINK:
00891          strcpy(subclass, "Unlink");
00892          break;
00893       case AST_HTML_LINKREJECT:
00894          strcpy(subclass, "Link Reject");
00895          break;
00896       default:
00897          snprintf(subclass, sizeof(subclass), "Unknown HTML frame '%d'\n", f->subclass);
00898          break;
00899       }
00900       break;
00901    case AST_FRAME_MODEM:
00902       strcpy(ftype, "Modem");
00903       switch (f->subclass) {
00904       case AST_MODEM_T38:
00905          strcpy(subclass, "T.38");
00906          break;
00907       case AST_MODEM_V150:
00908          strcpy(subclass, "V.150");
00909          break;
00910       default:
00911          snprintf(subclass, sizeof(subclass), "Unknown MODEM frame '%d'\n", f->subclass);
00912          break;
00913       }
00914       break;
00915    default:
00916       snprintf(ftype, sizeof(ftype), "Unknown Frametype '%d'", f->frametype);
00917    }
00918    if (!ast_strlen_zero(moreinfo))
00919       ast_verbose("%s [ TYPE: %s (%d) SUBCLASS: %s (%d) '%s' ] [%s]\n",  
00920              term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00921              term_color(cft, ftype, COLOR_BRRED, COLOR_BLACK, sizeof(cft)),
00922              f->frametype, 
00923              term_color(csub, subclass, COLOR_BRCYAN, COLOR_BLACK, sizeof(csub)),
00924              f->subclass, 
00925              term_color(cmn, moreinfo, COLOR_BRGREEN, COLOR_BLACK, sizeof(cmn)),
00926              term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00927    else
00928       ast_verbose("%s [ TYPE: %s (%d) SUBCLASS: %s (%d) ] [%s]\n",  
00929              term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00930              term_color(cft, ftype, COLOR_BRRED, COLOR_BLACK, sizeof(cft)),
00931              f->frametype, 
00932              term_color(csub, subclass, COLOR_BRCYAN, COLOR_BLACK, sizeof(csub)),
00933              f->subclass, 
00934              term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00935 }

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 342 of file frame.c.

References ast_dsp_frame_freed(), ast_filestream_frame_freed(), ast_free, 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, ast_frame::mallocd, ast_frame::offset, ast_frame::ptr, and ast_frame::src.

Referenced by mixmonitor_thread().

00343 {
00344    if (ast_test_flag(fr, AST_FRFLAG_FROM_TRANSLATOR)) {
00345       ast_translate_frame_freed(fr);
00346    } else if (ast_test_flag(fr, AST_FRFLAG_FROM_DSP)) {
00347       ast_dsp_frame_freed(fr);
00348    } else if (ast_test_flag(fr, AST_FRFLAG_FROM_FILESTREAM)) {
00349       ast_filestream_frame_freed(fr);
00350    }
00351 
00352    if (!fr->mallocd)
00353       return;
00354 
00355 #if !defined(LOW_MEMORY)
00356    if (cache && fr->mallocd == AST_MALLOCD_HDR) {
00357       /* Cool, only the header is malloc'd, let's just cache those for now 
00358        * to keep things simple... */
00359       struct ast_frame_cache *frames;
00360 
00361       if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames))) 
00362           && frames->size < FRAME_CACHE_MAX_SIZE) {
00363          AST_LIST_INSERT_HEAD(&frames->list, fr, frame_list);
00364          frames->size++;
00365          return;
00366       }
00367    }
00368 #endif
00369    
00370    if (fr->mallocd & AST_MALLOCD_DATA) {
00371       if (fr->data.ptr) 
00372          ast_free(fr->data.ptr - fr->offset);
00373    }
00374    if (fr->mallocd & AST_MALLOCD_SRC) {
00375       if (fr->src)
00376          ast_free((char *)fr->src);
00377    }
00378    if (fr->mallocd & AST_MALLOCD_HDR) {
00379 #ifdef TRACE_FRAMES
00380       AST_LIST_LOCK(&headerlist);
00381       headers--;
00382       AST_LIST_REMOVE(&headerlist, fr, frame_list);
00383       AST_LIST_UNLOCK(&headerlist);
00384 #endif         
00385       ast_free(fr);
00386    }
00387 }

static struct ast_frame* ast_frame_header_new ( void   )  [static]

Definition at line 294 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().

00295 {
00296    struct ast_frame *f;
00297 
00298 #if !defined(LOW_MEMORY)
00299    struct ast_frame_cache *frames;
00300 
00301    if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames)))) {
00302       if ((f = AST_LIST_REMOVE_HEAD(&frames->list, frame_list))) {
00303          size_t mallocd_len = f->mallocd_hdr_len;
00304          memset(f, 0, sizeof(*f));
00305          f->mallocd_hdr_len = mallocd_len;
00306          f->mallocd = AST_MALLOCD_HDR;
00307          frames->size--;
00308          return f;
00309       }
00310    }
00311    if (!(f = ast_calloc_cache(1, sizeof(*f))))
00312       return NULL;
00313 #else
00314    if (!(f = ast_calloc(1, sizeof(*f))))
00315       return NULL;
00316 #endif
00317 
00318    f->mallocd_hdr_len = sizeof(*f);
00319 #ifdef TRACE_FRAMES
00320    AST_LIST_LOCK(&headerlist);
00321    headers++;
00322    AST_LIST_INSERT_HEAD(&headerlist, f, frame_list);
00323    AST_LIST_UNLOCK(&headerlist);
00324 #endif   
00325    
00326    return f;
00327 }

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 1547 of file frame.c.

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

01548 {
01549    int count;
01550    short *data1, *data2;
01551 
01552    if ((f1->frametype != AST_FRAME_VOICE) || (f1->subclass != AST_FORMAT_SLINEAR))
01553       return -1;
01554 
01555    if ((f2->frametype != AST_FRAME_VOICE) || (f2->subclass != AST_FORMAT_SLINEAR))
01556       return -1;
01557 
01558    if (f1->samples != f2->samples)
01559       return -1;
01560 
01561    for (count = 0, data1 = f1->data.ptr, data2 = f2->data.ptr;
01562         count < f1->samples;
01563         count++, data1++, data2++)
01564       ast_slinear_saturated_add(data1, data2);
01565 
01566    return 0;
01567 }

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 453 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(), buf, 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::ptr, ast_frame::samples, ast_frame::seqno, ast_frame::src, ast_frame::subclass, ast_frame::ts, and ast_frame::uint32.

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

00454 {
00455    struct ast_frame *out = NULL;
00456    int len, srclen = 0;
00457    void *buf = NULL;
00458 
00459 #if !defined(LOW_MEMORY)
00460    struct ast_frame_cache *frames;
00461 #endif
00462 
00463    /* Start with standard stuff */
00464    len = sizeof(*out) + AST_FRIENDLY_OFFSET + f->datalen;
00465    /* If we have a source, add space for it */
00466    /*
00467     * XXX Watch out here - if we receive a src which is not terminated
00468     * properly, we can be easily attacked. Should limit the size we deal with.
00469     */
00470    if (f->src)
00471       srclen = strlen(f->src);
00472    if (srclen > 0)
00473       len += srclen + 1;
00474    
00475 #if !defined(LOW_MEMORY)
00476    if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames)))) {
00477       AST_LIST_TRAVERSE_SAFE_BEGIN(&frames->list, out, frame_list) {
00478          if (out->mallocd_hdr_len >= len) {
00479             size_t mallocd_len = out->mallocd_hdr_len;
00480 
00481             AST_LIST_REMOVE_CURRENT(frame_list);
00482             memset(out, 0, sizeof(*out));
00483             out->mallocd_hdr_len = mallocd_len;
00484             buf = out;
00485             frames->size--;
00486             break;
00487          }
00488       }
00489       AST_LIST_TRAVERSE_SAFE_END;
00490    }
00491 #endif
00492 
00493    if (!buf) {
00494       if (!(buf = ast_calloc_cache(1, len)))
00495          return NULL;
00496       out = buf;
00497       out->mallocd_hdr_len = len;
00498    }
00499 
00500    out->frametype = f->frametype;
00501    out->subclass = f->subclass;
00502    out->datalen = f->datalen;
00503    out->samples = f->samples;
00504    out->delivery = f->delivery;
00505    /* Set us as having malloc'd header only, so it will eventually
00506       get freed. */
00507    out->mallocd = AST_MALLOCD_HDR;
00508    out->offset = AST_FRIENDLY_OFFSET;
00509    if (out->datalen) {
00510       out->data.ptr = buf + sizeof(*out) + AST_FRIENDLY_OFFSET;
00511       memcpy(out->data.ptr, f->data.ptr, out->datalen);  
00512    } else {
00513       out->data.uint32 = f->data.uint32;
00514    }
00515    if (srclen > 0) {
00516       /* This may seem a little strange, but it's to avoid a gcc (4.2.4) compiler warning */
00517       char *src;
00518       out->src = buf + sizeof(*out) + AST_FRIENDLY_OFFSET + f->datalen;
00519       src = (char *) out->src;
00520       /* Must have space since we allocated for it */
00521       strcpy(src, f->src);
00522    }
00523    ast_copy_flags(out, f, AST_FRFLAG_HAS_TIMING_INFO);
00524    out->ts = f->ts;
00525    out->len = f->len;
00526    out->seqno = f->seqno;
00527    return out;
00528 }

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 394 of file frame.c.

References ast_clear_flag, ast_copy_flags, ast_frame_header_new(), ast_free, 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, ast_frame::len, ast_frame::mallocd, ast_frame::offset, ast_frame::ptr, ast_frame::samples, ast_frame::seqno, ast_frame::src, ast_frame::subclass, and ast_frame::ts.

Referenced by __ast_answer(), and jpeg_read_image().

00395 {
00396    struct ast_frame *out;
00397    void *newdata;
00398 
00399    ast_clear_flag(fr, AST_FRFLAG_FROM_TRANSLATOR);
00400    ast_clear_flag(fr, AST_FRFLAG_FROM_DSP);
00401 
00402    if (!(fr->mallocd & AST_MALLOCD_HDR)) {
00403       /* Allocate a new header if needed */
00404       if (!(out = ast_frame_header_new()))
00405          return NULL;
00406       out->frametype = fr->frametype;
00407       out->subclass = fr->subclass;
00408       out->datalen = fr->datalen;
00409       out->samples = fr->samples;
00410       out->offset = fr->offset;
00411       out->data = fr->data;
00412       /* Copy the timing data */
00413       ast_copy_flags(out, fr, AST_FRFLAG_HAS_TIMING_INFO);
00414       if (ast_test_flag(fr, AST_FRFLAG_HAS_TIMING_INFO)) {
00415          out->ts = fr->ts;
00416          out->len = fr->len;
00417          out->seqno = fr->seqno;
00418       }
00419    } else
00420       out = fr;
00421    
00422    if (!(fr->mallocd & AST_MALLOCD_SRC)) {
00423       if (fr->src) {
00424          if (!(out->src = ast_strdup(fr->src))) {
00425             if (out != fr)
00426                ast_free(out);
00427             return NULL;
00428          }
00429       }
00430    } else
00431       out->src = fr->src;
00432    
00433    if (!(fr->mallocd & AST_MALLOCD_DATA))  {
00434       if (!(newdata = ast_malloc(fr->datalen + AST_FRIENDLY_OFFSET))) {
00435          if (out->src != fr->src)
00436             ast_free((void *) out->src);
00437          if (out != fr)
00438             ast_free(out);
00439          return NULL;
00440       }
00441       newdata += AST_FRIENDLY_OFFSET;
00442       out->offset = AST_FRIENDLY_OFFSET;
00443       out->datalen = fr->datalen;
00444       memcpy(newdata, fr->data.ptr, fr->datalen);
00445       out->data.ptr = newdata;
00446    }
00447 
00448    out->mallocd = AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA;
00449    
00450    return out;
00451 }

struct ast_format_list* ast_get_format_list ( size_t *  size  ) 

Definition at line 546 of file frame.c.

References ARRAY_LEN, and AST_FORMAT_LIST.

00547 {
00548    *size = ARRAY_LEN(AST_FORMAT_LIST);
00549    return AST_FORMAT_LIST;
00550 }

struct ast_format_list* ast_get_format_list_index ( int  idx  ) 

Definition at line 541 of file frame.c.

References AST_FORMAT_LIST.

00542 {
00543    return &AST_FORMAT_LIST[idx];
00544 }

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 613 of file frame.c.

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

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

00614 {
00615    int x, all, format = 0;
00616 
00617    all = strcasecmp(name, "all") ? 0 : 1;
00618    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00619       if (all || 
00620            !strcasecmp(AST_FORMAT_LIST[x].name,name) ||
00621            !strcasecmp(AST_FORMAT_LIST[x].name, ast_expand_codec_alias(name))) {
00622          format |= AST_FORMAT_LIST[x].bits;
00623          if (!all)
00624             break;
00625       }
00626    }
00627 
00628    return format;
00629 }

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 552 of file frame.c.

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

Referenced by __ast_play_and_record(), __ast_read(), __ast_register_translator(), _sip_show_peer(), add_codec_to_answer(), add_codec_to_sdp(), add_tcodec_to_sdp(), add_vcodec_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(), handle_cli_core_show_file_formats(), handle_cli_core_show_translation(), handle_cli_iax2_show_channels(), handle_cli_iax2_show_peer(), handle_cli_moh_show_classes(), handle_core_show_image_formats(), iax2_request(), iax_show_provisioning(), jingle_show_channels(), login_exec(), moh_release(), oh323_rtp_read(), phone_setup(), print_codec_to_cli(), rebuild_matrix(), register_translator(), set_format(), set_peer_capabilities(), show_codecs(), sip_request_call(), sip_rtp_read(), socket_process(), start_rtp(), unistim_request(), unistim_rtp_read(), and unistim_write().

00553 {
00554    int x;
00555    char *ret = "unknown";
00556    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00557       if (AST_FORMAT_LIST[x].bits == format) {
00558          ret = AST_FORMAT_LIST[x].name;
00559          break;
00560       }
00561    }
00562    return ret;
00563 }

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 565 of file frame.c.

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

Referenced by __ast_read(), _sip_show_peer(), add_sdp(), ast_streamfile(), function_iaxpeer(), function_sippeer(), gtalk_is_answered(), gtalk_newcall(), handle_cli_iax2_show_peer(), handle_showchan(), handle_skinny_show_line(), process_sdp(), serialize_showchan(), set_format(), show_channels_cb(), sip_new(), sip_request_call(), sip_show_channel(), sip_show_settings(), and sip_write().

00566 {
00567    int x;
00568    unsigned len;
00569    char *start, *end = buf;
00570 
00571    if (!size)
00572       return buf;
00573    snprintf(end, size, "0x%x (", format);
00574    len = strlen(end);
00575    end += len;
00576    size -= len;
00577    start = end;
00578    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00579       if (AST_FORMAT_LIST[x].bits & format) {
00580          snprintf(end, size,"%s|",AST_FORMAT_LIST[x].name);
00581          len = strlen(end);
00582          end += len;
00583          size -= len;
00584       }
00585    }
00586    if (start == end)
00587       ast_copy_string(start, "nothing)", size);
00588    else if (size > 1)
00589       *(end -1) = ')';
00590    return buf;
00591 }

int 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.

Returns:
Returns number of errors encountered during parsing

Definition at line 1243 of file frame.c.

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

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

01244 {
01245    int errors = 0;
01246    char *parse = NULL, *this = NULL, *psize = NULL;
01247    int format = 0, framems = 0;
01248 
01249    parse = ast_strdupa(list);
01250    while ((this = strsep(&parse, ","))) {
01251       framems = 0;
01252       if ((psize = strrchr(this, ':'))) {
01253          *psize++ = '\0';
01254          ast_debug(1, "Packetization for codec: %s is %s\n", this, psize);
01255          framems = atoi(psize);
01256          if (framems < 0) {
01257             framems = 0;
01258             errors++;
01259             ast_log(LOG_WARNING, "Bad packetization value for codec %s\n", this);
01260          }
01261       }
01262       if (!(format = ast_getformatbyname(this))) {
01263          ast_log(LOG_WARNING, "Cannot %s unknown format '%s'\n", allowing ? "allow" : "disallow", this);
01264          errors++;
01265          continue;
01266       }
01267 
01268       if (mask) {
01269          if (allowing)
01270             *mask |= format;
01271          else
01272             *mask &= ~format;
01273       }
01274 
01275       /* Set up a preference list for audio. Do not include video in preferences 
01276          since we can not transcode video and have to use whatever is offered
01277        */
01278       if (pref && (format & AST_FORMAT_AUDIO_MASK)) {
01279          if (strcasecmp(this, "all")) {
01280             if (allowing) {
01281                ast_codec_pref_append(pref, format);
01282                ast_codec_pref_setsize(pref, format, framems);
01283             }
01284             else
01285                ast_codec_pref_remove(pref, format);
01286          } else if (!allowing) {
01287             memset(pref, 0, sizeof(*pref));
01288          }
01289       }
01290    }
01291    return errors;
01292 }

void ast_smoother_free ( struct ast_smoother s  ) 

Definition at line 289 of file frame.c.

References ast_free, and s.

Referenced by ast_rtp_destroy(), and ast_rtp_write().

00290 {
00291    ast_free(s);
00292 }

int ast_smoother_get_flags ( struct ast_smoother s  ) 

Definition at line 189 of file frame.c.

References s.

00190 {
00191    return s->flags;
00192 }

struct ast_smoother* ast_smoother_new ( int  size  ) 

Definition at line 179 of file frame.c.

References ast_malloc, ast_smoother_reset(), and s.

Referenced by ast_rtp_codec_setpref(), and ast_rtp_write().

00180 {
00181    struct ast_smoother *s;
00182    if (size < 1)
00183       return NULL;
00184    if ((s = ast_malloc(sizeof(*s))))
00185       ast_smoother_reset(s, size);
00186    return s;
00187 }

struct ast_frame* ast_smoother_read ( struct ast_smoother s  ) 

Definition at line 239 of file frame.c.

References ast_format_rate(), 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().

00240 {
00241    struct ast_frame *opt;
00242    int len;
00243 
00244    /* IF we have an optimization frame, send it */
00245    if (s->opt) {
00246       if (s->opt->offset < AST_FRIENDLY_OFFSET)
00247          ast_log(LOG_WARNING, "Returning a frame of inappropriate offset (%d).\n",
00248                      s->opt->offset);
00249       opt = s->opt;
00250       s->opt = NULL;
00251       return opt;
00252    }
00253 
00254    /* Make sure we have enough data */
00255    if (s->len < s->size) {
00256       /* Or, if this is a G.729 frame with VAD on it, send it immediately anyway */
00257       if (!((s->flags & AST_SMOOTHER_FLAG_G729) && (s->size % 10)))
00258          return NULL;
00259    }
00260    len = s->size;
00261    if (len > s->len)
00262       len = s->len;
00263    /* Make frame */
00264    s->f.frametype = AST_FRAME_VOICE;
00265    s->f.subclass = s->format;
00266    s->f.data.ptr = s->framedata + AST_FRIENDLY_OFFSET;
00267    s->f.offset = AST_FRIENDLY_OFFSET;
00268    s->f.datalen = len;
00269    /* Samples will be improper given VAD, but with VAD the concept really doesn't even exist */
00270    s->f.samples = len * s->samplesperbyte;   /* XXX rounding */
00271    s->f.delivery = s->delivery;
00272    /* Fill Data */
00273    memcpy(s->f.data.ptr, s->data, len);
00274    s->len -= len;
00275    /* Move remaining data to the front if applicable */
00276    if (s->len) {
00277       /* In principle this should all be fine because if we are sending
00278          G.729 VAD, the next timestamp will take over anyawy */
00279       memmove(s->data, s->data + len, s->len);
00280       if (!ast_tvzero(s->delivery)) {
00281          /* If we have delivery time, increment it, otherwise, leave it at 0 */
00282          s->delivery = ast_tvadd(s->delivery, ast_samp2tv(s->f.samples, ast_format_rate(s->format)));
00283       }
00284    }
00285    /* Return frame */
00286    return &s->f;
00287 }

void ast_smoother_reconfigure ( struct ast_smoother s,
int  bytes 
)

Reconfigure an existing smoother to output a different number of bytes per frame.

Parameters:
s the smoother to reconfigure
bytes the desired number of bytes per output frame
Returns:
nothing

Definition at line 157 of file frame.c.

References s, and smoother_frame_feed().

Referenced by ast_rtp_codec_setpref().

00158 {
00159    /* if there is no change, then nothing to do */
00160    if (s->size == bytes) {
00161       return;
00162    }
00163    /* set the new desired output size */
00164    s->size = bytes;
00165    /* if there is no 'optimized' frame in the smoother,
00166     *   then there is nothing left to do
00167     */
00168    if (!s->opt) {
00169       return;
00170    }
00171    /* there is an 'optimized' frame here at the old size,
00172     * but it must now be put into the buffer so the data
00173     * can be extracted at the new size
00174     */
00175    smoother_frame_feed(s, s->opt, s->opt_needs_swap);
00176    s->opt = NULL;
00177 }

void ast_smoother_reset ( struct ast_smoother s,
int  bytes 
)

Definition at line 151 of file frame.c.

References s.

Referenced by ast_smoother_new().

00152 {
00153    memset(s, 0, sizeof(*s));
00154    s->size = bytes;
00155 }

void ast_smoother_set_flags ( struct ast_smoother s,
int  flags 
)

Definition at line 194 of file frame.c.

References s.

Referenced by ast_rtp_codec_setpref(), and ast_rtp_write().

00195 {
00196    s->flags = flags;
00197 }

int ast_smoother_test_flag ( struct ast_smoother s,
int  flag 
)

Definition at line 199 of file frame.c.

References s.

Referenced by ast_rtp_write().

00200 {
00201    return (s->flags & flag);
00202 }

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

Definition at line 530 of file frame.c.

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

00531 {
00532    int i;
00533    unsigned short *dst_s = dst;
00534    const unsigned short *src_s = src;
00535 
00536    for (i = 0; i < samples; i++)
00537       dst_s[i] = (src_s[i]<<8) | (src_s[i]>>8);
00538 }

static void frame_cache_cleanup ( void *  data  )  [static]

Definition at line 330 of file frame.c.

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

00331 {
00332    struct ast_frame_cache *frames = data;
00333    struct ast_frame *f;
00334 
00335    while ((f = AST_LIST_REMOVE_HEAD(&frames->list, frame_list)))
00336       ast_free(f);
00337    
00338    ast_free(frames);
00339 }

static int g723_len ( unsigned char  buf  )  [static]

Definition at line 1294 of file frame.c.

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

Referenced by g723_samples().

01295 {
01296    enum frame_type type = buf & TYPE_MASK;
01297 
01298    switch(type) {
01299    case TYPE_DONTSEND:
01300       return 0;
01301       break;
01302    case TYPE_SILENCE:
01303       return 4;
01304       break;
01305    case TYPE_HIGH:
01306       return 24;
01307       break;
01308    case TYPE_LOW:
01309       return 20;
01310       break;
01311    default:
01312       ast_log(LOG_WARNING, "Badly encoded frame (%d)\n", type);
01313    }
01314    return -1;
01315 }

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

Definition at line 1317 of file frame.c.

References g723_len().

Referenced by ast_codec_get_samples().

01318 {
01319    int pos = 0;
01320    int samples = 0;
01321    int res;
01322    while(pos < maxlen) {
01323       res = g723_len(buf[pos]);
01324       if (res <= 0)
01325          break;
01326       samples += 240;
01327       pos += res;
01328    }
01329    return samples;
01330 }

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

Definition at line 1332 of file frame.c.

Referenced by speex_get_wb_sz_at(), and speex_samples().

01333 {
01334    int byte = bit / 8;       /* byte containing first bit */
01335    int rem = 8 - (bit % 8);  /* remaining bits in first byte */
01336    unsigned char ret = 0;
01337    
01338    if (n <= 0 || n > 8)
01339       return 0;
01340 
01341    if (rem < n) {
01342       ret = (data[byte] << (n - rem));
01343       ret |= (data[byte + 1] >> (8 - n + rem));
01344    } else {
01345       ret = (data[byte] >> (rem - n));
01346    }
01347 
01348    return (ret & (0xff >> (8 - n)));
01349 }

int init_framer ( void   ) 

Provided by frame.c

Definition at line 978 of file frame.c.

References ast_cli_register_multiple(), and my_clis.

Referenced by main().

00979 {
00980    ast_cli_register_multiple(my_clis, sizeof(my_clis) / sizeof(struct ast_cli_entry));
00981    return 0;   
00982 }

static char* show_codec_n ( struct ast_cli_entry e,
int  cmd,
struct ast_cli_args a 
) [static]

Definition at line 699 of file frame.c.

References ast_cli_args::argc, ast_cli_args::argv, ast_cli(), ast_codec2str(), CLI_GENERATE, CLI_INIT, CLI_SHOWUSAGE, CLI_SUCCESS, ast_cli_entry::command, ast_cli_args::fd, and ast_cli_entry::usage.

00700 {
00701    int codec, i, found=0;
00702 
00703    switch (cmd) {
00704    case CLI_INIT:
00705       e->command = "core show codec";
00706       e->usage = 
00707          "Usage: core show codec <number>\n"
00708          "       Displays codec mapping\n";
00709       return NULL;
00710    case CLI_GENERATE:
00711       return NULL;
00712    }
00713 
00714    if (a->argc != 4)
00715       return CLI_SHOWUSAGE;
00716 
00717    if (sscanf(a->argv[3],"%d",&codec) != 1)
00718       return CLI_SHOWUSAGE;
00719 
00720    for (i = 0; i < 32; i++)
00721       if (codec & (1 << i)) {
00722          found = 1;
00723          ast_cli(a->fd, "%11u (1 << %2d)  %s\n",1 << i,i,ast_codec2str(1<<i));
00724       }
00725 
00726    if (!found)
00727       ast_cli(a->fd, "Codec %d not found\n", codec);
00728 
00729    return CLI_SUCCESS;
00730 }

static char* show_codecs ( struct ast_cli_entry e,
int  cmd,
struct ast_cli_args a 
) [static]

Definition at line 644 of file frame.c.

References ast_cli_args::argc, ast_cli_args::argv, ast_cli(), ast_codec2str(), ast_getformatname(), ast_opt_dont_warn, CLI_GENERATE, CLI_INIT, CLI_SHOWUSAGE, CLI_SUCCESS, ast_cli_entry::command, ast_cli_args::fd, and ast_cli_entry::usage.

00645 {
00646    int i, found=0;
00647    char hex[25];
00648 
00649    switch (cmd) {
00650    case CLI_INIT:
00651       e->command = "core show codecs [audio|video|image]";
00652       e->usage = 
00653          "Usage: core show codecs [audio|video|image]\n"
00654          "       Displays codec mapping\n";
00655       return NULL;
00656    case CLI_GENERATE:
00657       return NULL;
00658    }
00659    
00660    if ((a->argc < 3) || (a->argc > 4))
00661       return CLI_SHOWUSAGE;
00662 
00663    if (!ast_opt_dont_warn)
00664       ast_cli(a->fd, "Disclaimer: this command is for informational purposes only.\n"
00665             "\tIt does not indicate anything about your configuration.\n");
00666 
00667    ast_cli(a->fd, "%11s %9s %10s   TYPE   %8s   %s\n","INT","BINARY","HEX","NAME","DESC");
00668    ast_cli(a->fd, "--------------------------------------------------------------------------------\n");
00669    if ((a->argc == 3) || (!strcasecmp(a->argv[3],"audio"))) {
00670       found = 1;
00671       for (i=0;i<13;i++) {
00672          snprintf(hex,25,"(0x%x)",1<<i);
00673          ast_cli(a->fd, "%11u (1 << %2d) %10s  audio   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00674       }
00675    }
00676 
00677    if ((a->argc == 3) || (!strcasecmp(a->argv[3],"image"))) {
00678       found = 1;
00679       for (i=16;i<18;i++) {
00680          snprintf(hex,25,"(0x%x)",1<<i);
00681          ast_cli(a->fd, "%11u (1 << %2d) %10s  image   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00682       }
00683    }
00684 
00685    if ((a->argc == 3) || (!strcasecmp(a->argv[3],"video"))) {
00686       found = 1;
00687       for (i=18;i<22;i++) {
00688          snprintf(hex,25,"(0x%x)",1<<i);
00689          ast_cli(a->fd, "%11u (1 << %2d) %10s  video   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00690       }
00691    }
00692 
00693    if (!found)
00694       return CLI_SHOWUSAGE;
00695    else
00696       return CLI_SUCCESS;
00697 }

static int smoother_frame_feed ( struct ast_smoother s,
struct ast_frame f,
int  swap 
) [static]

Definition at line 129 of file frame.c.

References ast_log(), AST_SMOOTHER_FLAG_G729, ast_swapcopy_samples(), ast_tvzero(), f, LOG_NOTICE, and s.

Referenced by __ast_smoother_feed(), and ast_smoother_reconfigure().

00130 {
00131    if (s->flags & AST_SMOOTHER_FLAG_G729) {
00132       if (s->len % 10) {
00133          ast_log(LOG_NOTICE, "Dropping extra frame of G.729 since we already have a VAD frame at the end\n");
00134          return 0;
00135       }
00136    }
00137    if (swap) {
00138       ast_swapcopy_samples(s->data + s->len, f->data.ptr, f->samples);
00139    } else {
00140       memcpy(s->data + s->len, f->data.ptr, f->datalen);
00141    }
00142    /* If either side is empty, reset the delivery time */
00143    if (!s->len || ast_tvzero(f->delivery) || ast_tvzero(s->delivery)) { /* XXX really ? */
00144       s->delivery = f->delivery;
00145    }
00146    s->len += f->datalen;
00147 
00148    return 0;
00149 }

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

Definition at line 1351 of file frame.c.

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

Referenced by speex_samples().

01352 {
01353    static int SpeexWBSubModeSz[] = {
01354       0, 36, 112, 192,
01355       352, 0, 0, 0 };
01356    int off = bit;
01357    unsigned char c;
01358 
01359    /* skip up to two wideband frames */
01360    if (((len * 8 - off) >= 5) && 
01361       get_n_bits_at(data, 1, off)) {
01362       c = get_n_bits_at(data, 3, off + 1);
01363       off += SpeexWBSubModeSz[c];
01364 
01365       if (((len * 8 - off) >= 5) && 
01366          get_n_bits_at(data, 1, off)) {
01367          c = get_n_bits_at(data, 3, off + 1);
01368          off += SpeexWBSubModeSz[c];
01369 
01370          if (((len * 8 - off) >= 5) && 
01371             get_n_bits_at(data, 1, off)) {
01372             ast_log(LOG_WARNING, "Encountered corrupt speex frame; too many wideband frames in a row.\n");
01373             return -1;
01374          }
01375       }
01376 
01377    }
01378    return off - bit;
01379 }

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

Definition at line 1381 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().

01382 {
01383    static int SpeexSubModeSz[] = {
01384       5, 43, 119, 160,
01385       220, 300, 364, 492, 
01386       79, 0, 0, 0,
01387       0, 0, 0, 0 };
01388    static int SpeexInBandSz[] = { 
01389       1, 1, 4, 4,
01390       4, 4, 4, 4,
01391       8, 8, 16, 16,
01392       32, 32, 64, 64 };
01393    int bit = 0;
01394    int cnt = 0;
01395    int off;
01396    unsigned char c;
01397 
01398    while ((len * 8 - bit) >= 5) {
01399       /* skip wideband frames */
01400       off = speex_get_wb_sz_at(data, len, bit);
01401       if (off < 0)  {
01402          ast_log(LOG_WARNING, "Had error while reading wideband frames for speex samples\n");
01403          break;
01404       }
01405       bit += off;
01406 
01407       if ((len * 8 - bit) < 5) {
01408          ast_log(LOG_WARNING, "Not enough bits remaining after wide band for speex samples.\n");
01409          break;
01410       }
01411 
01412       /* get control bits */
01413       c = get_n_bits_at(data, 5, bit);
01414       bit += 5;
01415 
01416       if (c == 15) { 
01417          /* terminator */
01418          break; 
01419       } else if (c == 14) {
01420          /* in-band signal; next 4 bits contain signal id */
01421          c = get_n_bits_at(data, 4, bit);
01422          bit += 4;
01423          bit += SpeexInBandSz[c];
01424       } else if (c == 13) {
01425          /* user in-band; next 5 bits contain msg len */
01426          c = get_n_bits_at(data, 5, bit);
01427          bit += 5;
01428          bit += c * 8;
01429       } else if (c > 8) {
01430          /* unknown */
01431          break;
01432       } else {
01433          /* skip number bits for submode (less the 5 control bits) */
01434          bit += SpeexSubModeSz[c] - 5;
01435          cnt += 160; /* new frame */
01436       }
01437    }
01438    return cnt;
01439 }


Variable Documentation

struct ast_format_list AST_FORMAT_LIST[] [static]

Definition of supported media formats (codecs).

Definition at line 101 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 127 of file frame.c.

Referenced by __ast_read(), __oh323_rtp_create(), __oh323_update_info(), agent_new(), agent_read(), ast_channel_masquerade(), ast_channel_setwhentohangup_tv(), ast_do_masquerade(), ast_rtcp_read(), ast_rtp_read(), ast_softhangup_nolock(), ast_udptl_read(), conf_run(), console_read(), gtalk_rtp_read(), handle_request_invite(), handle_response_invite(), iax2_read(), jingle_rtp_read(), local_read(), mgcp_rtp_read(), oh323_read(), oh323_rtp_read(), process_rfc2833(), process_sdp(), send_dtmf(), sip_read(), sip_rtp_read(), skinny_rtp_read(), unistim_rtp_read(), and wakeup_sub().

struct ast_threadstorage frame_cache = { .once = PTHREAD_ONCE_INIT, .key_init = __init_frame_cache , .custom_init = NULL , } [static]

Definition at line 52 of file frame.c.

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

struct ast_cli_entry my_clis[] [static]

Definition at line 970 of file frame.c.

Referenced by init_framer().


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