Thu Jul 9 13:41:19 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 __frame_free (struct ast_frame *fr, int cache)
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 index)
 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 *frame, int cache)
 Requests a frame to be allocated Frees a frame or list of frames.
static struct ast_frameast_frame_header_new (void)
int ast_frame_slinear_sum (struct ast_frame *f1, struct ast_frame *f2)
 Sums two frames of audio samples.
ast_frameast_frdup (const struct ast_frame *f)
 Copies a frame.
ast_frameast_frisolate (struct ast_frame *fr)
 Makes a frame independent of any static storage.
ast_format_listast_get_format_list (size_t *size)
ast_format_listast_get_format_list_index (int index)
int ast_getformatbyname (const char *name)
 Gets a format from a name.
char * ast_getformatname (int format)
 Get the name of a format.
char * ast_getformatname_multiple (char *buf, size_t size, int format)
 Get the names of a set of formats.
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 58 of file frame.c.

Referenced by __frame_free(), and iax_frame_free().

#define SMOOTHER_SIZE   8000

Definition at line 70 of file frame.c.

Referenced by __ast_smoother_feed().

#define TYPE_MASK   0x3

Definition at line 79 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 72 of file frame.c.

00072                 {
00073    TYPE_HIGH,     /* 0x0 */
00074    TYPE_LOW,      /* 0x1 */
00075    TYPE_SILENCE,  /* 0x2 */
00076    TYPE_DONTSEND  /* 0x3 */
00077 };


Function Documentation

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

Definition at line 199 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.

00200 {
00201    if (f->frametype != AST_FRAME_VOICE) {
00202       ast_log(LOG_WARNING, "Huh?  Can't smooth a non-voice frame!\n");
00203       return -1;
00204    }
00205    if (!s->format) {
00206       s->format = f->subclass;
00207       s->samplesperbyte = (float)f->samples / (float)f->datalen;
00208    } else if (s->format != f->subclass) {
00209       ast_log(LOG_WARNING, "Smoother was working on %d format frames, now trying to feed %d?\n", s->format, f->subclass);
00210       return -1;
00211    }
00212    if (s->len + f->datalen > SMOOTHER_SIZE) {
00213       ast_log(LOG_WARNING, "Out of smoother space\n");
00214       return -1;
00215    }
00216    if (((f->datalen == s->size) ||
00217         ((f->datalen < 10) && (s->flags & AST_SMOOTHER_FLAG_G729))) &&
00218        !s->opt &&
00219        !s->len &&
00220        (f->offset >= AST_MIN_OFFSET)) {
00221       /* Optimize by sending the frame we just got
00222          on the next read, thus eliminating the douple
00223          copy */
00224       if (swap)
00225          ast_swapcopy_samples(f->data, f->data, f->samples);
00226       s->opt = f;
00227       s->opt_needs_swap = swap ? 1 : 0;
00228       return 0;
00229    }
00230 
00231    return smoother_frame_feed(s, f, swap);
00232 }

static void __frame_free ( struct ast_frame fr,
int  cache 
) [static]

Definition at line 331 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_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, and ast_frame::src.

Referenced by ast_frame_free().

00332 {
00333    if (ast_test_flag(fr, AST_FRFLAG_FROM_TRANSLATOR)) {
00334       ast_translate_frame_freed(fr);
00335    } else if (ast_test_flag(fr, AST_FRFLAG_FROM_DSP)) {
00336       ast_dsp_frame_freed(fr);
00337    } else if (ast_test_flag(fr, AST_FRFLAG_FROM_FILESTREAM)) {
00338       ast_filestream_frame_freed(fr);
00339    }
00340 
00341    if (!fr->mallocd)
00342       return;
00343 
00344 #if !defined(LOW_MEMORY)
00345    if (cache && fr->mallocd == AST_MALLOCD_HDR) {
00346       /* Cool, only the header is malloc'd, let's just cache those for now 
00347        * to keep things simple... */
00348       struct ast_frame_cache *frames;
00349 
00350       if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames))) &&
00351           (frames->size < FRAME_CACHE_MAX_SIZE)) {
00352          AST_LIST_INSERT_HEAD(&frames->list, fr, frame_list);
00353          frames->size++;
00354          return;
00355       }
00356    }
00357 #endif
00358    
00359    if (fr->mallocd & AST_MALLOCD_DATA) {
00360       if (fr->data) 
00361          ast_free(fr->data - fr->offset);
00362    }
00363    if (fr->mallocd & AST_MALLOCD_SRC) {
00364       if (fr->src)
00365          ast_free((void *) fr->src);
00366    }
00367    if (fr->mallocd & AST_MALLOCD_HDR) {
00368       ast_free(fr);
00369    }
00370 }

static void __init_frame_cache ( void   )  [static]

A per-thread cache of frame headers.

Definition at line 47 of file frame.c.

00064 {

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 646 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().

00647 {
00648    int x;
00649    char *ret = "unknown";
00650    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00651       if (AST_FORMAT_LIST[x].bits == codec) {
00652          ret = AST_FORMAT_LIST[x].desc;
00653          break;
00654       }
00655    }
00656    return ret;
00657 }

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 1204 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().

01205 {
01206    int x, ret = 0, slot;
01207 
01208    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01209       slot = pref->order[x];
01210 
01211       if (!slot)
01212          break;
01213       if (formats & AST_FORMAT_LIST[slot-1].bits) {
01214          ret = AST_FORMAT_LIST[slot-1].bits;
01215          break;
01216       }
01217    }
01218    if (ret & AST_FORMAT_AUDIO_MASK)
01219       return ret;
01220 
01221    ast_debug(4, "Could not find preferred codec - %s\n", find_best ? "Going for the best codec" : "Returning zero codec");
01222 
01223       return find_best ? ast_best_codec(formats) : 0;
01224 }

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 1468 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().

01469 {
01470    int len = 0;
01471 
01472    /* XXX Still need speex, g723, and lpc10 XXX */ 
01473    switch(format) {
01474    case AST_FORMAT_G723_1:
01475       len = (samples / 240) * 20;
01476       break;
01477    case AST_FORMAT_ILBC:
01478       len = (samples / 240) * 50;
01479       break;
01480    case AST_FORMAT_GSM:
01481       len = (samples / 160) * 33;
01482       break;
01483    case AST_FORMAT_G729A:
01484       len = samples / 8;
01485       break;
01486    case AST_FORMAT_SLINEAR:
01487    case AST_FORMAT_SLINEAR16:
01488       len = samples * 2;
01489       break;
01490    case AST_FORMAT_ULAW:
01491    case AST_FORMAT_ALAW:
01492       len = samples;
01493       break;
01494    case AST_FORMAT_G722:
01495    case AST_FORMAT_ADPCM:
01496    case AST_FORMAT_G726:
01497    case AST_FORMAT_G726_AAL2:
01498       len = samples / 2;
01499       break;
01500    default:
01501       ast_log(LOG_WARNING, "Unable to calculate sample length for format %s\n", ast_getformatname(format));
01502    }
01503 
01504    return len;
01505 }

int ast_codec_get_samples ( struct ast_frame f  ) 

Returns the number of samples contained in the frame.

Definition at line 1424 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().

01425 {
01426    int samples=0;
01427    switch(f->subclass) {
01428    case AST_FORMAT_SPEEX:
01429       samples = speex_samples(f->data, f->datalen);
01430       break;
01431    case AST_FORMAT_G723_1:
01432       samples = g723_samples(f->data, f->datalen);
01433       break;
01434    case AST_FORMAT_ILBC:
01435       samples = 240 * (f->datalen / 50);
01436       break;
01437    case AST_FORMAT_GSM:
01438       samples = 160 * (f->datalen / 33);
01439       break;
01440    case AST_FORMAT_G729A:
01441       samples = f->datalen * 8;
01442       break;
01443    case AST_FORMAT_SLINEAR:
01444    case AST_FORMAT_SLINEAR16:
01445       samples = f->datalen / 2;
01446       break;
01447    case AST_FORMAT_LPC10:
01448       /* assumes that the RTP packet contains one LPC10 frame */
01449       samples = 22 * 8;
01450       samples += (((char *)(f->data))[7] & 0x1) * 8;
01451       break;
01452    case AST_FORMAT_ULAW:
01453    case AST_FORMAT_ALAW:
01454       samples = f->datalen;
01455       break;
01456    case AST_FORMAT_G722:
01457    case AST_FORMAT_ADPCM:
01458    case AST_FORMAT_G726:
01459    case AST_FORMAT_G726_AAL2:
01460       samples = f->datalen * 2;
01461       break;
01462    default:
01463       ast_log(LOG_WARNING, "Unable to calculate samples for format %s\n", ast_getformatname(f->subclass));
01464    }
01465    return samples;
01466 }

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 1063 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().

01064 {
01065    int x, newindex = 0;
01066 
01067    ast_codec_pref_remove(pref, format);
01068 
01069    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01070       if (AST_FORMAT_LIST[x].bits == format) {
01071          newindex = x + 1;
01072          break;
01073       }
01074    }
01075 
01076    if (newindex) {
01077       for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01078          if (!pref->order[x]) {
01079             pref->order[x] = newindex;
01080             break;
01081          }
01082       }
01083    }
01084 
01085    return x;
01086 }

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 965 of file frame.c.

References ast_codec_pref::order.

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

00966 {
00967    int x, differential = (int) 'A', mem;
00968    char *from, *to;
00969 
00970    if (right) {
00971       from = pref->order;
00972       to = buf;
00973       mem = size;
00974    } else {
00975       to = pref->order;
00976       from = buf;
00977       mem = 32;
00978    }
00979 
00980    memset(to, 0, mem);
00981    for (x = 0; x < 32 ; x++) {
00982       if (!from[x])
00983          break;
00984       to[x] = right ? (from[x] + differential) : (from[x] - differential);
00985    }
00986 }

struct ast_format_list ast_codec_pref_getsize ( struct ast_codec_pref pref,
int  format 
)

Get packet size for codec.

Definition at line 1165 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().

01166 {
01167    int x, index = -1, framems = 0;
01168    struct ast_format_list fmt = { 0, };
01169 
01170    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01171       if (AST_FORMAT_LIST[x].bits == format) {
01172          fmt = AST_FORMAT_LIST[x];
01173          index = x;
01174          break;
01175       }
01176    }
01177 
01178    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01179       if (pref->order[x] == (index + 1)) {
01180          framems = pref->framing[x];
01181          break;
01182       }
01183    }
01184 
01185    /* size validation */
01186    if (!framems)
01187       framems = AST_FORMAT_LIST[index].def_ms;
01188 
01189    if (AST_FORMAT_LIST[index].inc_ms && framems % AST_FORMAT_LIST[index].inc_ms) /* avoid division by zero */
01190       framems -= framems % AST_FORMAT_LIST[index].inc_ms;
01191 
01192    if (framems < AST_FORMAT_LIST[index].min_ms)
01193       framems = AST_FORMAT_LIST[index].min_ms;
01194 
01195    if (framems > AST_FORMAT_LIST[index].max_ms)
01196       framems = AST_FORMAT_LIST[index].max_ms;
01197 
01198    fmt.cur_ms = framems;
01199 
01200    return fmt;
01201 }

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 1023 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().

01024 {
01025    int slot = 0;
01026 
01027    
01028    if ((index >= 0) && (index < sizeof(pref->order))) {
01029       slot = pref->order[index];
01030    }
01031 
01032    return slot ? AST_FORMAT_LIST[slot-1].bits : 0;
01033 }

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 1089 of file frame.c.

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

Referenced by create_addr().

01090 {
01091    int x, newindex = 0;
01092 
01093    /* First step is to get the codecs "index number" */
01094    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01095       if (AST_FORMAT_LIST[x].bits == format) {
01096          newindex = x + 1;
01097          break;
01098       }
01099    }
01100    /* Done if its unknown */
01101    if (!newindex)
01102       return;
01103 
01104    /* Now find any existing occurrence, or the end */
01105    for (x = 0; x < 32; x++) {
01106       if (!pref->order[x] || pref->order[x] == newindex)
01107          break;
01108    }
01109 
01110    if (only_if_existing && !pref->order[x])
01111       return;
01112 
01113    /* Move down to make space to insert - either all the way to the end,
01114       or as far as the existing location (which will be overwritten) */
01115    for (; x > 0; x--) {
01116       pref->order[x] = pref->order[x - 1];
01117       pref->framing[x] = pref->framing[x - 1];
01118    }
01119 
01120    /* And insert the new entry */
01121    pref->order[0] = newindex;
01122    pref->framing[0] = 0; /* ? */
01123 }

void ast_codec_pref_remove ( struct ast_codec_pref pref,
int  format 
)

Remove audio a codec from a preference list.

Definition at line 1036 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().

01037 {
01038    struct ast_codec_pref oldorder;
01039    int x, y = 0;
01040    int slot;
01041    int size;
01042 
01043    if (!pref->order[0])
01044       return;
01045 
01046    memcpy(&oldorder, pref, sizeof(oldorder));
01047    memset(pref, 0, sizeof(*pref));
01048 
01049    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01050       slot = oldorder.order[x];
01051       size = oldorder.framing[x];
01052       if (! slot)
01053          break;
01054       if (AST_FORMAT_LIST[slot-1].bits != format) {
01055          pref->order[y] = slot;
01056          pref->framing[y++] = size;
01057       }
01058    }
01059    
01060 }

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

Set packet size for codec.

Definition at line 1126 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().

01127 {
01128    int x, index = -1;
01129 
01130    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01131       if (AST_FORMAT_LIST[x].bits == format) {
01132          index = x;
01133          break;
01134       }
01135    }
01136 
01137    if (index < 0)
01138       return -1;
01139 
01140    /* size validation */
01141    if (!framems)
01142       framems = AST_FORMAT_LIST[index].def_ms;
01143 
01144    if (AST_FORMAT_LIST[index].inc_ms && framems % AST_FORMAT_LIST[index].inc_ms) /* avoid division by zero */
01145       framems -= framems % AST_FORMAT_LIST[index].inc_ms;
01146 
01147    if (framems < AST_FORMAT_LIST[index].min_ms)
01148       framems = AST_FORMAT_LIST[index].min_ms;
01149 
01150    if (framems > AST_FORMAT_LIST[index].max_ms)
01151       framems = AST_FORMAT_LIST[index].max_ms;
01152 
01153 
01154    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01155       if (pref->order[x] == (index + 1)) {
01156          pref->framing[x] = framems;
01157          break;
01158       }
01159    }
01160 
01161    return x;
01162 }

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 988 of file frame.c.

References ast_codec_pref_index(), and ast_getformatname().

Referenced by dump_prefs(), and socket_process().

00989 {
00990    int x, codec; 
00991    size_t total_len, slen;
00992    char *formatname;
00993    
00994    memset(buf,0,size);
00995    total_len = size;
00996    buf[0] = '(';
00997    total_len--;
00998    for(x = 0; x < 32 ; x++) {
00999       if (total_len <= 0)
01000          break;
01001       if (!(codec = ast_codec_pref_index(pref,x)))
01002          break;
01003       if ((formatname = ast_getformatname(codec))) {
01004          slen = strlen(formatname);
01005          if (slen > total_len)
01006             break;
01007          strncat(buf, formatname, total_len - 1); /* safe */
01008          total_len -= slen;
01009       }
01010       if (total_len && x < 31 && ast_codec_pref_index(pref , x + 1)) {
01011          strncat(buf, "|", total_len - 1); /* safe */
01012          total_len--;
01013       }
01014    }
01015    if (total_len) {
01016       strncat(buf, ")", total_len - 1); /* safe */
01017       total_len--;
01018    }
01019 
01020    return size - total_len;
01021 }

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

Definition at line 617 of file frame.c.

References ARRAY_LEN.

Referenced by ast_getformatbyname().

00618 {
00619    int x;
00620 
00621    for (x = 0; x < ARRAY_LEN(ast_codec_alias_table); x++) {
00622       if (!strcmp(in,ast_codec_alias_table[x].alias))
00623          return ast_codec_alias_table[x].realname;
00624    }
00625    return in;
00626 }

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 1507 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(), conf_run(), and volume_callback().

01508 {
01509    int count;
01510    short *fdata = f->data;
01511    short adjust_value = abs(adjustment);
01512 
01513    if ((f->frametype != AST_FRAME_VOICE) || (f->subclass != AST_FORMAT_SLINEAR))
01514       return -1;
01515 
01516    if (!adjustment)
01517       return 0;
01518 
01519    for (count = 0; count < f->samples; count++) {
01520       if (adjustment > 0) {
01521          ast_slinear_saturated_multiply(&fdata[count], &adjust_value);
01522       } else if (adjustment < 0) {
01523          ast_slinear_saturated_divide(&fdata[count], &adjust_value);
01524       }
01525    }
01526 
01527    return 0;
01528 }

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

Dump a frame for debugging purposes

Definition at line 748 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().

00749 {
00750    const char noname[] = "unknown";
00751    char ftype[40] = "Unknown Frametype";
00752    char cft[80];
00753    char subclass[40] = "Unknown Subclass";
00754    char csub[80];
00755    char moreinfo[40] = "";
00756    char cn[60];
00757    char cp[40];
00758    char cmn[40];
00759    const char *message = "Unknown";
00760 
00761    if (!name)
00762       name = noname;
00763 
00764 
00765    if (!f) {
00766       ast_verbose("%s [ %s (NULL) ] [%s]\n", 
00767          term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00768          term_color(cft, "HANGUP", COLOR_BRRED, COLOR_BLACK, sizeof(cft)), 
00769          term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00770       return;
00771    }
00772    /* XXX We should probably print one each of voice and video when the format changes XXX */
00773    if (f->frametype == AST_FRAME_VOICE)
00774       return;
00775    if (f->frametype == AST_FRAME_VIDEO)
00776       return;
00777    switch(f->frametype) {
00778    case AST_FRAME_DTMF_BEGIN:
00779       strcpy(ftype, "DTMF Begin");
00780       subclass[0] = f->subclass;
00781       subclass[1] = '\0';
00782       break;
00783    case AST_FRAME_DTMF_END:
00784       strcpy(ftype, "DTMF End");
00785       subclass[0] = f->subclass;
00786       subclass[1] = '\0';
00787       break;
00788    case AST_FRAME_CONTROL:
00789       strcpy(ftype, "Control");
00790       switch(f->subclass) {
00791       case AST_CONTROL_HANGUP:
00792          strcpy(subclass, "Hangup");
00793          break;
00794       case AST_CONTROL_RING:
00795          strcpy(subclass, "Ring");
00796          break;
00797       case AST_CONTROL_RINGING:
00798          strcpy(subclass, "Ringing");
00799          break;
00800       case AST_CONTROL_ANSWER:
00801          strcpy(subclass, "Answer");
00802          break;
00803       case AST_CONTROL_BUSY:
00804          strcpy(subclass, "Busy");
00805          break;
00806       case AST_CONTROL_TAKEOFFHOOK:
00807          strcpy(subclass, "Take Off Hook");
00808          break;
00809       case AST_CONTROL_OFFHOOK:
00810          strcpy(subclass, "Line Off Hook");
00811          break;
00812       case AST_CONTROL_CONGESTION:
00813          strcpy(subclass, "Congestion");
00814          break;
00815       case AST_CONTROL_FLASH:
00816          strcpy(subclass, "Flash");
00817          break;
00818       case AST_CONTROL_WINK:
00819          strcpy(subclass, "Wink");
00820          break;
00821       case AST_CONTROL_OPTION:
00822          strcpy(subclass, "Option");
00823          break;
00824       case AST_CONTROL_RADIO_KEY:
00825          strcpy(subclass, "Key Radio");
00826          break;
00827       case AST_CONTROL_RADIO_UNKEY:
00828          strcpy(subclass, "Unkey Radio");
00829          break;
00830       case AST_CONTROL_HOLD:
00831          strcpy(subclass, "Hold");
00832          break;
00833       case AST_CONTROL_UNHOLD:
00834          strcpy(subclass, "Unhold");
00835          break;
00836       case AST_CONTROL_T38:
00837          if (f->datalen != sizeof(enum ast_control_t38)) {
00838             message = "Invalid";
00839          } else {
00840             enum ast_control_t38 state = *((enum ast_control_t38 *) f->data);
00841             if (state == AST_T38_REQUEST_NEGOTIATE)
00842                message = "Negotiation Requested";
00843             else if (state == AST_T38_REQUEST_TERMINATE)
00844                message = "Negotiation Request Terminated";
00845             else if (state == AST_T38_NEGOTIATED)
00846                message = "Negotiated";
00847             else if (state == AST_T38_TERMINATED)
00848                message = "Terminated";
00849             else if (state == AST_T38_REFUSED)
00850                message = "Refused";
00851          }
00852          snprintf(subclass, sizeof(subclass), "T38/%s", message);
00853          break;
00854       case -1:
00855          strcpy(subclass, "Stop generators");
00856          break;
00857       default:
00858          snprintf(subclass, sizeof(subclass), "Unknown control '%d'", f->subclass);
00859       }
00860       break;
00861    case AST_FRAME_NULL:
00862       strcpy(ftype, "Null Frame");
00863       strcpy(subclass, "N/A");
00864       break;
00865    case AST_FRAME_IAX:
00866       /* Should never happen */
00867       strcpy(ftype, "IAX Specific");
00868       snprintf(subclass, sizeof(subclass), "IAX Frametype %d", f->subclass);
00869       break;
00870    case AST_FRAME_TEXT:
00871       strcpy(ftype, "Text");
00872       strcpy(subclass, "N/A");
00873       ast_copy_string(moreinfo, f->data, sizeof(moreinfo));
00874       break;
00875    case AST_FRAME_IMAGE:
00876       strcpy(ftype, "Image");
00877       snprintf(subclass, sizeof(subclass), "Image format %s\n", ast_getformatname(f->subclass));
00878       break;
00879    case AST_FRAME_HTML:
00880       strcpy(ftype, "HTML");
00881       switch(f->subclass) {
00882       case AST_HTML_URL:
00883          strcpy(subclass, "URL");
00884          ast_copy_string(moreinfo, f->data, sizeof(moreinfo));
00885          break;
00886       case AST_HTML_DATA:
00887          strcpy(subclass, "Data");
00888          break;
00889       case AST_HTML_BEGIN:
00890          strcpy(subclass, "Begin");
00891          break;
00892       case AST_HTML_END:
00893          strcpy(subclass, "End");
00894          break;
00895       case AST_HTML_LDCOMPLETE:
00896          strcpy(subclass, "Load Complete");
00897          break;
00898       case AST_HTML_NOSUPPORT:
00899          strcpy(subclass, "No Support");
00900          break;
00901       case AST_HTML_LINKURL:
00902          strcpy(subclass, "Link URL");
00903          ast_copy_string(moreinfo, f->data, sizeof(moreinfo));
00904          break;
00905       case AST_HTML_UNLINK:
00906          strcpy(subclass, "Unlink");
00907          break;
00908       case AST_HTML_LINKREJECT:
00909          strcpy(subclass, "Link Reject");
00910          break;
00911       default:
00912          snprintf(subclass, sizeof(subclass), "Unknown HTML frame '%d'\n", f->subclass);
00913          break;
00914       }
00915       break;
00916    case AST_FRAME_MODEM:
00917       strcpy(ftype, "Modem");
00918       switch (f->subclass) {
00919       case AST_MODEM_T38:
00920          strcpy(subclass, "T.38");
00921          break;
00922       case AST_MODEM_V150:
00923          strcpy(subclass, "V.150");
00924          break;
00925       default:
00926          snprintf(subclass, sizeof(subclass), "Unknown MODEM frame '%d'\n", f->subclass);
00927          break;
00928       }
00929       break;
00930    default:
00931       snprintf(ftype, sizeof(ftype), "Unknown Frametype '%d'", f->frametype);
00932    }
00933    if (!ast_strlen_zero(moreinfo))
00934       ast_verbose("%s [ TYPE: %s (%d) SUBCLASS: %s (%d) '%s' ] [%s]\n",  
00935              term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00936              term_color(cft, ftype, COLOR_BRRED, COLOR_BLACK, sizeof(cft)),
00937              f->frametype, 
00938              term_color(csub, subclass, COLOR_BRCYAN, COLOR_BLACK, sizeof(csub)),
00939              f->subclass, 
00940              term_color(cmn, moreinfo, COLOR_BRGREEN, COLOR_BLACK, sizeof(cmn)),
00941              term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00942    else
00943       ast_verbose("%s [ TYPE: %s (%d) SUBCLASS: %s (%d) ] [%s]\n",  
00944              term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00945              term_color(cft, ftype, COLOR_BRRED, COLOR_BLACK, sizeof(cft)),
00946              f->frametype, 
00947              term_color(csub, subclass, COLOR_BRCYAN, COLOR_BLACK, sizeof(csub)),
00948              f->subclass, 
00949              term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00950 }

void ast_frame_free ( struct ast_frame fr,
int  cache 
)

Requests a frame to be allocated Frees a frame or list of frames.

Parameters:
fr Frame to free, or head of list to free
cache Whether to consider this frame for frame caching

Definition at line 373 of file frame.c.

References __frame_free(), AST_LIST_NEXT, ast_frame::frame_list, and ast_frame::next.

Referenced by mixmonitor_thread().

00374 {
00375    struct ast_frame *next;
00376 
00377    for (next = AST_LIST_NEXT(frame, frame_list);
00378         frame;
00379         frame = next, next = frame ? AST_LIST_NEXT(frame, frame_list) : NULL) {
00380       __frame_free(frame, cache);
00381    }
00382 }

static struct ast_frame* ast_frame_header_new ( void   )  [static]

Definition at line 289 of file frame.c.

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

Referenced by ast_frisolate().

00290 {
00291    struct ast_frame *f;
00292 
00293 #if !defined(LOW_MEMORY)
00294    struct ast_frame_cache *frames;
00295 
00296    if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames)))) {
00297       if ((f = AST_LIST_REMOVE_HEAD(&frames->list, frame_list))) {
00298          size_t mallocd_len = f->mallocd_hdr_len;
00299          memset(f, 0, sizeof(*f));
00300          f->mallocd_hdr_len = mallocd_len;
00301          f->mallocd = AST_MALLOCD_HDR;
00302          frames->size--;
00303          return f;
00304       }
00305    }
00306    if (!(f = ast_calloc_cache(1, sizeof(*f))))
00307       return NULL;
00308 #else
00309    if (!(f = ast_calloc(1, sizeof(*f))))
00310       return NULL;
00311 #endif
00312 
00313    f->mallocd_hdr_len = sizeof(*f);
00314    
00315    return f;
00316 }

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 1530 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.

01531 {
01532    int count;
01533    short *data1, *data2;
01534 
01535    if ((f1->frametype != AST_FRAME_VOICE) || (f1->subclass != AST_FORMAT_SLINEAR))
01536       return -1;
01537 
01538    if ((f2->frametype != AST_FRAME_VOICE) || (f2->subclass != AST_FORMAT_SLINEAR))
01539       return -1;
01540 
01541    if (f1->samples != f2->samples)
01542       return -1;
01543 
01544    for (count = 0, data1 = f1->data, data2 = f2->data;
01545         count < f1->samples;
01546         count++, data1++, data2++)
01547       ast_slinear_saturated_add(data1, data2);
01548 
01549    return 0;
01550 }

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 470 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::samples, ast_frame::seqno, ast_frame::src, ast_frame::subclass, and ast_frame::ts.

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

00471 {
00472    struct ast_frame *out = NULL;
00473    int len, srclen = 0;
00474    void *buf = NULL;
00475 
00476 #if !defined(LOW_MEMORY)
00477    struct ast_frame_cache *frames;
00478 #endif
00479 
00480    /* Start with standard stuff */
00481    len = sizeof(*out) + AST_FRIENDLY_OFFSET + f->datalen;
00482    /* If we have a source, add space for it */
00483    /*
00484     * XXX Watch out here - if we receive a src which is not terminated
00485     * properly, we can be easily attacked. Should limit the size we deal with.
00486     */
00487    if (f->src)
00488       srclen = strlen(f->src);
00489    if (srclen > 0)
00490       len += srclen + 1;
00491    
00492 #if !defined(LOW_MEMORY)
00493    if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames)))) {
00494       AST_LIST_TRAVERSE_SAFE_BEGIN(&frames->list, out, frame_list) {
00495          if (out->mallocd_hdr_len >= len) {
00496             size_t mallocd_len = out->mallocd_hdr_len;
00497 
00498             AST_LIST_REMOVE_CURRENT(frame_list);
00499             memset(out, 0, sizeof(*out));
00500             out->mallocd_hdr_len = mallocd_len;
00501             buf = out;
00502             frames->size--;
00503             break;
00504          }
00505       }
00506       AST_LIST_TRAVERSE_SAFE_END;
00507    }
00508 #endif
00509 
00510    if (!buf) {
00511       if (!(buf = ast_calloc_cache(1, len)))
00512          return NULL;
00513       out = buf;
00514       out->mallocd_hdr_len = len;
00515    }
00516 
00517    out->frametype = f->frametype;
00518    out->subclass = f->subclass;
00519    out->datalen = f->datalen;
00520    out->samples = f->samples;
00521    out->delivery = f->delivery;
00522    /* Set us as having malloc'd header only, so it will eventually
00523       get freed. */
00524    out->mallocd = AST_MALLOCD_HDR;
00525    out->offset = AST_FRIENDLY_OFFSET;
00526    if (out->datalen) {
00527       out->data = buf + sizeof(*out) + AST_FRIENDLY_OFFSET;
00528       memcpy(out->data, f->data, out->datalen); 
00529    }
00530    if (srclen > 0) {
00531       /* This may seem a little strange, but it's to avoid a gcc (4.2.4) compiler warning */
00532       char *src;
00533       out->src = buf + sizeof(*out) + AST_FRIENDLY_OFFSET + f->datalen;
00534       src = (char *) out->src;
00535       /* Must have space since we allocated for it */
00536       strcpy(src, f->src);
00537    }
00538    ast_copy_flags(out, f, AST_FRFLAG_HAS_TIMING_INFO);
00539    out->ts = f->ts;
00540    out->len = f->len;
00541    out->seqno = f->seqno;
00542    return out;
00543 }

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
Note:
This function may modify the frame passed to it, so you must not assume the frame will be intact after the isolated frame has been produced. In other words, calling this function on a frame should be the last operation you do with that frame before freeing it (or exiting the block, if the frame is on the stack.)

Definition at line 389 of file frame.c.

References ast_clear_flag, ast_copy_flags, ast_frame_header_new(), ast_frdup(), ast_free, AST_FRFLAG_FROM_DSP, AST_FRFLAG_FROM_FILESTREAM, 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::samples, ast_frame::seqno, ast_frame::src, ast_frame::subclass, and ast_frame::ts.

Referenced by __ast_answer(), ast_slinfactory_feed(), autoservice_run(), and jpeg_read_image().

00390 {
00391    struct ast_frame *out;
00392    void *newdata;
00393 
00394    /* if none of the existing frame is malloc'd, let ast_frdup() do it
00395       since it is more efficient
00396    */
00397    if (fr->mallocd == 0) {
00398       return ast_frdup(fr);
00399    }
00400 
00401    /* if everything is already malloc'd, we are done */
00402    if ((fr->mallocd & (AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA)) ==
00403        (AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA)) {
00404       return fr;
00405    }
00406 
00407    if (!(fr->mallocd & AST_MALLOCD_HDR)) {
00408       /* Allocate a new header if needed */
00409       if (!(out = ast_frame_header_new())) {
00410          return NULL;
00411       }
00412       out->frametype = fr->frametype;
00413       out->subclass = fr->subclass;
00414       out->datalen = fr->datalen;
00415       out->samples = fr->samples;
00416       out->offset = fr->offset;
00417       /* Copy the timing data */
00418       ast_copy_flags(out, fr, AST_FRFLAG_HAS_TIMING_INFO);
00419       if (ast_test_flag(fr, AST_FRFLAG_HAS_TIMING_INFO)) {
00420          out->ts = fr->ts;
00421          out->len = fr->len;
00422          out->seqno = fr->seqno;
00423       }
00424    } else {
00425       ast_clear_flag(fr, AST_FRFLAG_FROM_TRANSLATOR);
00426       ast_clear_flag(fr, AST_FRFLAG_FROM_DSP);
00427       ast_clear_flag(fr, AST_FRFLAG_FROM_FILESTREAM);
00428       out = fr;
00429    }
00430    
00431    if (!(fr->mallocd & AST_MALLOCD_SRC) && fr->src) {
00432       if (!(out->src = ast_strdup(fr->src))) {
00433          if (out != fr) {
00434             ast_free(out);
00435          }
00436          return NULL;
00437       }
00438    } else {
00439       out->src = fr->src;
00440       fr->src = NULL;
00441       fr->mallocd &= ~AST_MALLOCD_SRC;
00442    }
00443    
00444    if (!(fr->mallocd & AST_MALLOCD_DATA))  {
00445       if (!(newdata = ast_malloc(fr->datalen + AST_FRIENDLY_OFFSET))) {
00446          if (out->src != fr->src) {
00447             ast_free((void *) out->src);
00448          }
00449          if (out != fr) {
00450             ast_free(out);
00451          }
00452          return NULL;
00453       }
00454       newdata += AST_FRIENDLY_OFFSET;
00455       out->offset = AST_FRIENDLY_OFFSET;
00456       out->datalen = fr->datalen;
00457       memcpy(newdata, fr->data, fr->datalen);
00458       out->data = newdata;
00459    } else {
00460       out->data = fr->data;
00461       memset(&fr->data, 0, sizeof(fr->data));
00462       fr->mallocd &= ~AST_MALLOCD_DATA;
00463    }
00464 
00465    out->mallocd = AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA;
00466    
00467    return out;
00468 }

struct ast_format_list* ast_get_format_list ( size_t *  size  ) 

Definition at line 561 of file frame.c.

References ARRAY_LEN, and AST_FORMAT_LIST.

00562 {
00563    *size = ARRAY_LEN(AST_FORMAT_LIST);
00564    return AST_FORMAT_LIST;
00565 }

struct ast_format_list* ast_get_format_list_index ( int  index  ) 

Definition at line 556 of file frame.c.

References AST_FORMAT_LIST.

00557 {
00558    return &AST_FORMAT_LIST[index];
00559 }

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 628 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().

00629 {
00630    int x, all, format = 0;
00631 
00632    all = strcasecmp(name, "all") ? 0 : 1;
00633    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00634       if (all || 
00635            !strcasecmp(AST_FORMAT_LIST[x].name,name) ||
00636            !strcasecmp(AST_FORMAT_LIST[x].name,ast_expand_codec_alias(name))) {
00637          format |= AST_FORMAT_LIST[x].bits;
00638          if (!all)
00639             break;
00640       }
00641    }
00642 
00643    return format;
00644 }

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 567 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_local_capabilities(), set_peer_capabilities(), show_codecs(), sip_request_call(), sip_rtp_read(), socket_process(), start_rtp(), unistim_request(), unistim_rtp_read(), and unistim_write().

00568 {
00569    int x;
00570    char *ret = "unknown";
00571    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00572       if (AST_FORMAT_LIST[x].bits == format) {
00573          ret = AST_FORMAT_LIST[x].name;
00574          break;
00575       }
00576    }
00577    return ret;
00578 }

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 580 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().

00581 {
00582    int x;
00583    unsigned len;
00584    char *start, *end = buf;
00585 
00586    if (!size)
00587       return buf;
00588    snprintf(end, size, "0x%x (", format);
00589    len = strlen(end);
00590    end += len;
00591    size -= len;
00592    start = end;
00593    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00594       if (AST_FORMAT_LIST[x].bits & format) {
00595          snprintf(end, size,"%s|",AST_FORMAT_LIST[x].name);
00596          len = strlen(end);
00597          end += len;
00598          size -= len;
00599       }
00600    }
00601    if (start == end)
00602       ast_copy_string(start, "nothing)", size);
00603    else if (size > 1)
00604       *(end -1) = ')';
00605    return buf;
00606 }

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 1226 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().

01227 {
01228    int errors = 0;
01229    char *parse = NULL, *this = NULL, *psize = NULL;
01230    int format = 0, framems = 0;
01231 
01232    parse = ast_strdupa(list);
01233    while ((this = strsep(&parse, ","))) {
01234       framems = 0;
01235       if ((psize = strrchr(this, ':'))) {
01236          *psize++ = '\0';
01237          ast_debug(1, "Packetization for codec: %s is %s\n", this, psize);
01238          framems = atoi(psize);
01239          if (framems < 0) {
01240             framems = 0;
01241             errors++;
01242             ast_log(LOG_WARNING, "Bad packetization value for codec %s\n", this);
01243          }
01244       }
01245       if (!(format = ast_getformatbyname(this))) {
01246          ast_log(LOG_WARNING, "Cannot %s unknown format '%s'\n", allowing ? "allow" : "disallow", this);
01247          errors++;
01248          continue;
01249       }
01250 
01251       if (mask) {
01252          if (allowing)
01253             *mask |= format;
01254          else
01255             *mask &= ~format;
01256       }
01257 
01258       /* Set up a preference list for audio. Do not include video in preferences 
01259          since we can not transcode video and have to use whatever is offered
01260        */
01261       if (pref && (format & AST_FORMAT_AUDIO_MASK)) {
01262          if (strcasecmp(this, "all")) {
01263             if (allowing) {
01264                ast_codec_pref_append(pref, format);
01265                ast_codec_pref_setsize(pref, format, framems);
01266             }
01267             else
01268                ast_codec_pref_remove(pref, format);
01269          } else if (!allowing) {
01270             memset(pref, 0, sizeof(*pref));
01271          }
01272       }
01273    }
01274    return errors;
01275 }

void ast_smoother_free ( struct ast_smoother s  ) 

Definition at line 284 of file frame.c.

References ast_free, and s.

Referenced by ast_rtp_destroy(), and ast_rtp_write().

00285 {
00286    ast_free(s);
00287 }

int ast_smoother_get_flags ( struct ast_smoother s  ) 

Definition at line 184 of file frame.c.

References s.

00185 {
00186    return s->flags;
00187 }

struct ast_smoother* ast_smoother_new ( int  size  ) 

Definition at line 174 of file frame.c.

References ast_malloc, ast_smoother_reset(), and s.

Referenced by ast_rtp_codec_setpref(), and ast_rtp_write().

00175 {
00176    struct ast_smoother *s;
00177    if (size < 1)
00178       return NULL;
00179    if ((s = ast_malloc(sizeof(*s))))
00180       ast_smoother_reset(s, size);
00181    return s;
00182 }

struct ast_frame* ast_smoother_read ( struct ast_smoother s  ) 

Definition at line 234 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().

00235 {
00236    struct ast_frame *opt;
00237    int len;
00238 
00239    /* IF we have an optimization frame, send it */
00240    if (s->opt) {
00241       if (s->opt->offset < AST_FRIENDLY_OFFSET)
00242          ast_log(LOG_WARNING, "Returning a frame of inappropriate offset (%d).\n",
00243                      s->opt->offset);
00244       opt = s->opt;
00245       s->opt = NULL;
00246       return opt;
00247    }
00248 
00249    /* Make sure we have enough data */
00250    if (s->len < s->size) {
00251       /* Or, if this is a G.729 frame with VAD on it, send it immediately anyway */
00252       if (!((s->flags & AST_SMOOTHER_FLAG_G729) && (s->len % 10)))
00253          return NULL;
00254    }
00255    len = s->size;
00256    if (len > s->len)
00257       len = s->len;
00258    /* Make frame */
00259    s->f.frametype = AST_FRAME_VOICE;
00260    s->f.subclass = s->format;
00261    s->f.data = s->framedata + AST_FRIENDLY_OFFSET;
00262    s->f.offset = AST_FRIENDLY_OFFSET;
00263    s->f.datalen = len;
00264    /* Samples will be improper given VAD, but with VAD the concept really doesn't even exist */
00265    s->f.samples = len * s->samplesperbyte;   /* XXX rounding */
00266    s->f.delivery = s->delivery;
00267    /* Fill Data */
00268    memcpy(s->f.data, s->data, len);
00269    s->len -= len;
00270    /* Move remaining data to the front if applicable */
00271    if (s->len) {
00272       /* In principle this should all be fine because if we are sending
00273          G.729 VAD, the next timestamp will take over anyawy */
00274       memmove(s->data, s->data + len, s->len);
00275       if (!ast_tvzero(s->delivery)) {
00276          /* If we have delivery time, increment it, otherwise, leave it at 0 */
00277          s->delivery = ast_tvadd(s->delivery, ast_samp2tv(s->f.samples, ast_format_rate(s->format)));
00278       }
00279    }
00280    /* Return frame */
00281    return &s->f;
00282 }

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 152 of file frame.c.

References s, and smoother_frame_feed().

Referenced by ast_rtp_codec_setpref().

00153 {
00154    /* if there is no change, then nothing to do */
00155    if (s->size == bytes) {
00156       return;
00157    }
00158    /* set the new desired output size */
00159    s->size = bytes;
00160    /* if there is no 'optimized' frame in the smoother,
00161     *   then there is nothing left to do
00162     */
00163    if (!s->opt) {
00164       return;
00165    }
00166    /* there is an 'optimized' frame here at the old size,
00167     * but it must now be put into the buffer so the data
00168     * can be extracted at the new size
00169     */
00170    smoother_frame_feed(s, s->opt, s->opt_needs_swap);
00171    s->opt = NULL;
00172 }

void ast_smoother_reset ( struct ast_smoother s,
int  bytes 
)

Definition at line 146 of file frame.c.

References s.

Referenced by ast_smoother_new().

00147 {
00148    memset(s, 0, sizeof(*s));
00149    s->size = bytes;
00150 }

void ast_smoother_set_flags ( struct ast_smoother s,
int  flags 
)

Definition at line 189 of file frame.c.

References s.

Referenced by ast_rtp_codec_setpref(), and ast_rtp_write().

00190 {
00191    s->flags = flags;
00192 }

int ast_smoother_test_flag ( struct ast_smoother s,
int  flag 
)

Definition at line 194 of file frame.c.

References s.

Referenced by ast_rtp_write().

00195 {
00196    return (s->flags & flag);
00197 }

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

Definition at line 545 of file frame.c.

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

00546 {
00547    int i;
00548    unsigned short *dst_s = dst;
00549    const unsigned short *src_s = src;
00550 
00551    for (i = 0; i < samples; i++)
00552       dst_s[i] = (src_s[i]<<8) | (src_s[i]>>8);
00553 }

static void frame_cache_cleanup ( void *  data  )  [static]

Definition at line 319 of file frame.c.

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

00320 {
00321    struct ast_frame_cache *frames = data;
00322    struct ast_frame *f;
00323 
00324    while ((f = AST_LIST_REMOVE_HEAD(&frames->list, frame_list)))
00325       ast_free(f);
00326    
00327    ast_free(frames);
00328 }

static int g723_len ( unsigned char  buf  )  [static]

Definition at line 1277 of file frame.c.

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

Referenced by g723_samples().

01278 {
01279    enum frame_type type = buf & TYPE_MASK;
01280 
01281    switch(type) {
01282    case TYPE_DONTSEND:
01283       return 0;
01284       break;
01285    case TYPE_SILENCE:
01286       return 4;
01287       break;
01288    case TYPE_HIGH:
01289       return 24;
01290       break;
01291    case TYPE_LOW:
01292       return 20;
01293       break;
01294    default:
01295       ast_log(LOG_WARNING, "Badly encoded frame (%d)\n", type);
01296    }
01297    return -1;
01298 }

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

Definition at line 1300 of file frame.c.

References g723_len().

Referenced by ast_codec_get_samples().

01301 {
01302    int pos = 0;
01303    int samples = 0;
01304    int res;
01305    while(pos < maxlen) {
01306       res = g723_len(buf[pos]);
01307       if (res <= 0)
01308          break;
01309       samples += 240;
01310       pos += res;
01311    }
01312    return samples;
01313 }

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

Definition at line 1315 of file frame.c.

Referenced by speex_get_wb_sz_at(), and speex_samples().

01316 {
01317    int byte = bit / 8;       /* byte containing first bit */
01318    int rem = 8 - (bit % 8);  /* remaining bits in first byte */
01319    unsigned char ret = 0;
01320    
01321    if (n <= 0 || n > 8)
01322       return 0;
01323 
01324    if (rem < n) {
01325       ret = (data[byte] << (n - rem));
01326       ret |= (data[byte + 1] >> (8 - n + rem));
01327    } else {
01328       ret = (data[byte] >> (rem - n));
01329    }
01330 
01331    return (ret & (0xff >> (8 - n)));
01332 }

int init_framer ( void   ) 

Provided by frame.c

Definition at line 959 of file frame.c.

References ast_cli_register_multiple(), and my_clis.

Referenced by main().

00960 {
00961    ast_cli_register_multiple(my_clis, sizeof(my_clis) / sizeof(struct ast_cli_entry));
00962    return 0;   
00963 }

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

Definition at line 714 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.

00715 {
00716    int codec, i, found=0;
00717 
00718    switch (cmd) {
00719    case CLI_INIT:
00720       e->command = "core show codec";
00721       e->usage = 
00722          "Usage: core show codec <number>\n"
00723          "       Displays codec mapping\n";
00724       return NULL;
00725    case CLI_GENERATE:
00726       return NULL;
00727    }
00728 
00729    if (a->argc != 4)
00730       return CLI_SHOWUSAGE;
00731 
00732    if (sscanf(a->argv[3],"%d",&codec) != 1)
00733       return CLI_SHOWUSAGE;
00734 
00735    for (i = 0; i < 32; i++)
00736       if (codec & (1 << i)) {
00737          found = 1;
00738          ast_cli(a->fd, "%11u (1 << %2d)  %s\n",1 << i,i,ast_codec2str(1<<i));
00739       }
00740 
00741    if (!found)
00742       ast_cli(a->fd, "Codec %d not found\n", codec);
00743 
00744    return CLI_SUCCESS;
00745 }

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

Definition at line 659 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.

00660 {
00661    int i, found=0;
00662    char hex[25];
00663 
00664    switch (cmd) {
00665    case CLI_INIT:
00666       e->command = "core show codecs [audio|video|image]";
00667       e->usage = 
00668          "Usage: core show codecs [audio|video|image]\n"
00669          "       Displays codec mapping\n";
00670       return NULL;
00671    case CLI_GENERATE:
00672       return NULL;
00673    }
00674    
00675    if ((a->argc < 3) || (a->argc > 4))
00676       return CLI_SHOWUSAGE;
00677 
00678    if (!ast_opt_dont_warn)
00679       ast_cli(a->fd, "Disclaimer: this command is for informational purposes only.\n"
00680             "\tIt does not indicate anything about your configuration.\n");
00681 
00682    ast_cli(a->fd, "%11s %9s %10s   TYPE   %8s   %s\n","INT","BINARY","HEX","NAME","DESC");
00683    ast_cli(a->fd, "--------------------------------------------------------------------------------\n");
00684    if ((a->argc == 3) || (!strcasecmp(a->argv[3],"audio"))) {
00685       found = 1;
00686       for (i=0;i<13;i++) {
00687          snprintf(hex,25,"(0x%x)",1<<i);
00688          ast_cli(a->fd, "%11u (1 << %2d) %10s  audio   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00689       }
00690    }
00691 
00692    if ((a->argc == 3) || (!strcasecmp(a->argv[3],"image"))) {
00693       found = 1;
00694       for (i=16;i<18;i++) {
00695          snprintf(hex,25,"(0x%x)",1<<i);
00696          ast_cli(a->fd, "%11u (1 << %2d) %10s  image   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00697       }
00698    }
00699 
00700    if ((a->argc == 3) || (!strcasecmp(a->argv[3],"video"))) {
00701       found = 1;
00702       for (i=18;i<22;i++) {
00703          snprintf(hex,25,"(0x%x)",1<<i);
00704          ast_cli(a->fd, "%11u (1 << %2d) %10s  video   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00705       }
00706    }
00707 
00708    if (!found)
00709       return CLI_SHOWUSAGE;
00710    else
00711       return CLI_SUCCESS;
00712 }

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

Definition at line 124 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().

00125 {
00126    if (s->flags & AST_SMOOTHER_FLAG_G729) {
00127       if (s->len % 10) {
00128          ast_log(LOG_NOTICE, "Dropping extra frame of G.729 since we already have a VAD frame at the end\n");
00129          return 0;
00130       }
00131    }
00132    if (swap) {
00133       ast_swapcopy_samples(s->data + s->len, f->data, f->samples);
00134    } else {
00135       memcpy(s->data + s->len, f->data, f->datalen);
00136    }
00137    /* If either side is empty, reset the delivery time */
00138    if (!s->len || ast_tvzero(f->delivery) || ast_tvzero(s->delivery)) { /* XXX really ? */
00139       s->delivery = f->delivery;
00140    }
00141    s->len += f->datalen;
00142 
00143    return 0;
00144 }

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

Definition at line 1334 of file frame.c.

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

Referenced by speex_samples().

01335 {
01336    static int SpeexWBSubModeSz[] = {
01337       0, 36, 112, 192,
01338       352, 0, 0, 0 };
01339    int off = bit;
01340    unsigned char c;
01341 
01342    /* skip up to two wideband frames */
01343    if (((len * 8 - off) >= 5) && 
01344       get_n_bits_at(data, 1, off)) {
01345       c = get_n_bits_at(data, 3, off + 1);
01346       off += SpeexWBSubModeSz[c];
01347 
01348       if (((len * 8 - off) >= 5) && 
01349          get_n_bits_at(data, 1, off)) {
01350          c = get_n_bits_at(data, 3, off + 1);
01351          off += SpeexWBSubModeSz[c];
01352 
01353          if (((len * 8 - off) >= 5) && 
01354             get_n_bits_at(data, 1, off)) {
01355             ast_log(LOG_WARNING, "Encountered corrupt speex frame; too many wideband frames in a row.\n");
01356             return -1;
01357          }
01358       }
01359 
01360    }
01361    return off - bit;
01362 }

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

Definition at line 1364 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().

01365 {
01366    static int SpeexSubModeSz[] = {
01367       5, 43, 119, 160,
01368       220, 300, 364, 492, 
01369       79, 0, 0, 0,
01370       0, 0, 0, 0 };
01371    static int SpeexInBandSz[] = { 
01372       1, 1, 4, 4,
01373       4, 4, 4, 4,
01374       8, 8, 16, 16,
01375       32, 32, 64, 64 };
01376    int bit = 0;
01377    int cnt = 0;
01378    int off;
01379    unsigned char c;
01380 
01381    while ((len * 8 - bit) >= 5) {
01382       /* skip wideband frames */
01383       off = speex_get_wb_sz_at(data, len, bit);
01384       if (off < 0)  {
01385          ast_log(LOG_WARNING, "Had error while reading wideband frames for speex samples\n");
01386          break;
01387       }
01388       bit += off;
01389 
01390       if ((len * 8 - bit) < 5) {
01391          ast_log(LOG_WARNING, "Not enough bits remaining after wide band for speex samples.\n");
01392          break;
01393       }
01394 
01395       /* get control bits */
01396       c = get_n_bits_at(data, 5, bit);
01397       bit += 5;
01398 
01399       if (c == 15) { 
01400          /* terminator */
01401          break; 
01402       } else if (c == 14) {
01403          /* in-band signal; next 4 bits contain signal id */
01404          c = get_n_bits_at(data, 4, bit);
01405          bit += 4;
01406          bit += SpeexInBandSz[c];
01407       } else if (c == 13) {
01408          /* user in-band; next 5 bits contain msg len */
01409          c = get_n_bits_at(data, 5, bit);
01410          bit += 5;
01411          bit += c * 8;
01412       } else if (c > 8) {
01413          /* unknown */
01414          break;
01415       } else {
01416          /* skip number bits for submode (less the 5 control bits) */
01417          bit += SpeexSubModeSz[c] - 5;
01418          cnt += 160; /* new frame */
01419       }
01420    }
01421    return cnt;
01422 }


Variable Documentation

struct ast_format_list AST_FORMAT_LIST[] [static]

Definition of supported media formats (codecs).

Definition at line 97 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 122 of file frame.c.

Referenced by __ast_read(), __oh323_rtp_create(), __oh323_update_info(), agent_new(), agent_read(), ast_channel_masquerade(), ast_channel_setwhentohangup(), ast_do_masquerade(), ast_rtcp_read(), ast_rtp_read(), ast_softhangup_nolock(), ast_udptl_read(), conf_run(), console_read(), features_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 47 of file frame.c.

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

struct ast_cli_entry my_clis[] [static]

Initial value:

 {
   { .handler =  show_codecs , .summary =  "Displays a list of codecs" ,__VA_ARGS__ },
   { .handler =  show_codec_n , .summary =  "Shows a specific codec" ,__VA_ARGS__ },
}

Definition at line 954 of file frame.c.

Referenced by init_framer().


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