Sat Aug 6 00:39:28 2011

Asterisk developer's documentation


frame.c

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00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * Copyright (C) 1999 - 2005, Digium, Inc.
00005  *
00006  * Mark Spencer <markster@digium.com>
00007  *
00008  * See http://www.asterisk.org for more information about
00009  * the Asterisk project. Please do not directly contact
00010  * any of the maintainers of this project for assistance;
00011  * the project provides a web site, mailing lists and IRC
00012  * channels for your use.
00013  *
00014  * This program is free software, distributed under the terms of
00015  * the GNU General Public License Version 2. See the LICENSE file
00016  * at the top of the source tree.
00017  */
00018 
00019 /*! \file
00020  *
00021  * \brief Frame and codec manipulation routines
00022  *
00023  * \author Mark Spencer <markster@digium.com> 
00024  */
00025 
00026 #include "asterisk.h"
00027 
00028 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 269960 $")
00029 
00030 #include <stdlib.h>
00031 #include <unistd.h>
00032 #include <string.h>
00033 #include <errno.h>
00034 #include <stdio.h>
00035 
00036 #include "asterisk/lock.h"
00037 #include "asterisk/frame.h"
00038 #include "asterisk/logger.h"
00039 #include "asterisk/options.h"
00040 #include "asterisk/channel.h"
00041 #include "asterisk/cli.h"
00042 #include "asterisk/term.h"
00043 #include "asterisk/utils.h"
00044 #include "asterisk/threadstorage.h"
00045 #include "asterisk/linkedlists.h"
00046 #include "asterisk/translate.h"
00047 #include "asterisk/dsp.h"
00048 #include "asterisk/file.h"
00049 
00050 #if !defined(LOW_MEMORY)
00051 static void frame_cache_cleanup(void *data);
00052 
00053 /*! \brief A per-thread cache of frame headers */
00054 AST_THREADSTORAGE_CUSTOM(frame_cache, frame_cache_init, frame_cache_cleanup);
00055 
00056 /*! 
00057  * \brief Maximum ast_frame cache size
00058  *
00059  * In most cases where the frame header cache will be useful, the size
00060  * of the cache will stay very small.  However, it is not always the case that
00061  * the same thread that allocates the frame will be the one freeing them, so
00062  * sometimes a thread will never have any frames in its cache, or the cache
00063  * will never be pulled from.  For the latter case, we limit the maximum size. 
00064  */ 
00065 #define FRAME_CACHE_MAX_SIZE  10
00066 
00067 /*! \brief This is just so ast_frames, a list head struct for holding a list of
00068  *  ast_frame structures, is defined. */
00069 AST_LIST_HEAD_NOLOCK(ast_frames, ast_frame);
00070 
00071 struct ast_frame_cache {
00072    struct ast_frames list;
00073    size_t size;
00074 };
00075 #endif
00076 
00077 #define SMOOTHER_SIZE 8000
00078 
00079 enum frame_type {
00080    TYPE_HIGH,     /* 0x0 */
00081    TYPE_LOW,      /* 0x1 */
00082    TYPE_SILENCE,  /* 0x2 */
00083    TYPE_DONTSEND  /* 0x3 */
00084 };
00085 
00086 #define TYPE_MASK 0x3
00087 
00088 struct ast_smoother {
00089    int size;
00090    int format;
00091    int flags;
00092    float samplesperbyte;
00093    unsigned int opt_needs_swap:1;
00094    struct ast_frame f;
00095    struct timeval delivery;
00096    char data[SMOOTHER_SIZE];
00097    char framedata[SMOOTHER_SIZE + AST_FRIENDLY_OFFSET];
00098    struct ast_frame *opt;
00099    int len;
00100 };
00101 
00102 /*! \brief Definition of supported media formats (codecs) */
00103 static struct ast_format_list AST_FORMAT_LIST[] = {               /*!< Bit number: comment  - Bit numbers are hard coded in show_codec() */
00104    { 1, AST_FORMAT_G723_1 , "g723" , "G.723.1", 24, 30, 300, 30, 30 },  /*!<  1 */
00105    { 1, AST_FORMAT_GSM, "gsm" , "GSM", 33, 20, 300, 20, 20 },     /*!<  2: codec_gsm.c */
00106    { 1, AST_FORMAT_ULAW, "ulaw", "G.711 u-law", 80, 10, 150, 10, 20 },  /*!<  3: codec_ulaw.c */
00107    { 1, AST_FORMAT_ALAW, "alaw", "G.711 A-law", 80, 10, 150, 10, 20 },  /*!<  4: codec_alaw.c */
00108    { 1, AST_FORMAT_G726, "g726", "G.726 RFC3551", 40, 10, 300, 10, 20 },   /*!<  5: codec_g726.c */
00109    { 1, AST_FORMAT_ADPCM, "adpcm" , "ADPCM", 40, 10, 300, 10, 20 },  /*!<  6: codec_adpcm.c */
00110    { 1, AST_FORMAT_SLINEAR, "slin", "16 bit Signed Linear PCM", 160, 10, 70, 10, 20, AST_SMOOTHER_FLAG_BE },   /*!< 7 */
00111    { 1, AST_FORMAT_LPC10, "lpc10", "LPC10", 7, 20, 20, 20, 20 },     /*!<  8: codec_lpc10.c */ 
00112    { 1, AST_FORMAT_G729A, "g729", "G.729A", 10, 10, 230, 10, 40, AST_SMOOTHER_FLAG_G729 },   /*!<  9: Binary commercial distribution */
00113    { 1, AST_FORMAT_SPEEX, "speex", "SpeeX", 10, 10, 60, 10, 20 },    /*!< 10: codec_speex.c */
00114    { 1, AST_FORMAT_ILBC, "ilbc", "iLBC", 50, 30, 30, 30, 30 },    /*!< 11: codec_ilbc.c */ /* inc=30ms - workaround */
00115    { 1, AST_FORMAT_G726_AAL2, "g726aal2", "G.726 AAL2", 40, 10, 300, 10, 20 },   /*!<  12: codec_g726.c */
00116    { 1, AST_FORMAT_G722, "g722", "G722", 80, 10, 150, 10, 20 },      /*!< 13 */
00117    { 0, 0, "nothing", "undefined" },
00118    { 0, 0, "nothing", "undefined" },
00119    { 0, 0, "nothing", "undefined" },
00120    { 0, 0, "nothing", "undefined" },
00121    { 0, AST_FORMAT_MAX_AUDIO, "maxaudio", "Maximum audio format" },  
00122    { 1, AST_FORMAT_JPEG, "jpeg", "JPEG image"}, /*!< 17: See format_jpeg.c */
00123    { 1, AST_FORMAT_PNG, "png", "PNG image"}, /*!< 18: Image format */
00124    { 1, AST_FORMAT_H261, "h261", "H.261 Video" },  /*!< 19: Video Passthrough */
00125    { 1, AST_FORMAT_H263, "h263", "H.263 Video" },  /*!< 20: Passthrough support, see format_h263.c */
00126    { 1, AST_FORMAT_H263_PLUS, "h263p", "H.263+ Video" }, /*!< 21: See format_h263.c */
00127    { 1, AST_FORMAT_H264, "h264", "H.264 Video" },  /*!< 22: Passthrough support, see format_h263.c */
00128    { 0, 0, "nothing", "undefined" },
00129    { 0, 0, "nothing", "undefined" },
00130    { 0, 0, "nothing", "undefined" },
00131    { 0, AST_FORMAT_MAX_VIDEO, "maxvideo", "Maximum video format" },
00132 };
00133 
00134 struct ast_frame ast_null_frame = { AST_FRAME_NULL, };
00135 
00136 static int smoother_frame_feed(struct ast_smoother *s, struct ast_frame *f, int swap)
00137 {
00138    if (s->flags & AST_SMOOTHER_FLAG_G729) {
00139       if (s->len % 10) {
00140          ast_log(LOG_NOTICE, "Dropping extra frame of G.729 since we already have a VAD frame at the end\n");
00141          return 0;
00142       }
00143    }
00144    if (swap) {
00145       ast_swapcopy_samples(s->data + s->len, f->data, f->samples);
00146    } else {
00147       memcpy(s->data + s->len, f->data, f->datalen);
00148    }
00149    /* If either side is empty, reset the delivery time */
00150    if (!s->len || ast_tvzero(f->delivery) || ast_tvzero(s->delivery)) { /* XXX really ? */
00151       s->delivery = f->delivery;
00152    }
00153    s->len += f->datalen;
00154 
00155    return 0;
00156 }
00157 
00158 void ast_smoother_reset(struct ast_smoother *s, int bytes)
00159 {
00160    memset(s, 0, sizeof(*s));
00161    s->size = bytes;
00162 }
00163 
00164 void ast_smoother_reconfigure(struct ast_smoother *s, int bytes)
00165 {
00166    /* if there is no change, then nothing to do */
00167    if (s->size == bytes) {
00168       return;
00169    }
00170    /* set the new desired output size */
00171    s->size = bytes;
00172    /* if there is no 'optimized' frame in the smoother,
00173     *   then there is nothing left to do
00174     */
00175    if (!s->opt) {
00176       return;
00177    }
00178    /* there is an 'optimized' frame here at the old size,
00179     * but it must now be put into the buffer so the data
00180     * can be extracted at the new size
00181     */
00182    smoother_frame_feed(s, s->opt, s->opt_needs_swap);
00183    s->opt = NULL;
00184 }
00185 
00186 struct ast_smoother *ast_smoother_new(int size)
00187 {
00188    struct ast_smoother *s;
00189    if (size < 1)
00190       return NULL;
00191    if ((s = ast_malloc(sizeof(*s))))
00192       ast_smoother_reset(s, size);
00193    return s;
00194 }
00195 
00196 int ast_smoother_get_flags(struct ast_smoother *s)
00197 {
00198    return s->flags;
00199 }
00200 
00201 void ast_smoother_set_flags(struct ast_smoother *s, int flags)
00202 {
00203    s->flags = flags;
00204 }
00205 
00206 int ast_smoother_test_flag(struct ast_smoother *s, int flag)
00207 {
00208    return (s->flags & flag);
00209 }
00210 
00211 int __ast_smoother_feed(struct ast_smoother *s, struct ast_frame *f, int swap)
00212 {
00213    if (f->frametype != AST_FRAME_VOICE) {
00214       ast_log(LOG_WARNING, "Huh?  Can't smooth a non-voice frame!\n");
00215       return -1;
00216    }
00217    if (!s->format) {
00218       s->format = f->subclass;
00219       s->samplesperbyte = (float)f->samples / (float)f->datalen;
00220    } else if (s->format != f->subclass) {
00221       ast_log(LOG_WARNING, "Smoother was working on %d format frames, now trying to feed %d?\n", s->format, f->subclass);
00222       return -1;
00223    }
00224    if (s->len + f->datalen > SMOOTHER_SIZE) {
00225       ast_log(LOG_WARNING, "Out of smoother space\n");
00226       return -1;
00227    }
00228    if (((f->datalen == s->size) ||
00229         ((f->datalen < 10) && (s->flags & AST_SMOOTHER_FLAG_G729))) &&
00230        !s->opt &&
00231        !s->len &&
00232        (f->offset >= AST_MIN_OFFSET)) {
00233       /* Optimize by sending the frame we just got
00234          on the next read, thus eliminating the douple
00235          copy */
00236       if (swap)
00237          ast_swapcopy_samples(f->data, f->data, f->samples);
00238       s->opt = f;
00239       s->opt_needs_swap = swap ? 1 : 0;
00240       return 0;
00241    }
00242 
00243    return smoother_frame_feed(s, f, swap);
00244 }
00245 
00246 struct ast_frame *ast_smoother_read(struct ast_smoother *s)
00247 {
00248    struct ast_frame *opt;
00249    int len;
00250 
00251    /* IF we have an optimization frame, send it */
00252    if (s->opt) {
00253       if (s->opt->offset < AST_FRIENDLY_OFFSET)
00254          ast_log(LOG_WARNING, "Returning a frame of inappropriate offset (%d).\n",
00255                      s->opt->offset);
00256       opt = s->opt;
00257       s->opt = NULL;
00258       return opt;
00259    }
00260 
00261    /* Make sure we have enough data */
00262    if (s->len < s->size) {
00263       /* Or, if this is a G.729 frame with VAD on it, send it immediately anyway */
00264       if (!((s->flags & AST_SMOOTHER_FLAG_G729) && (s->len % 10)))
00265          return NULL;
00266    }
00267    len = s->size;
00268    if (len > s->len)
00269       len = s->len;
00270    /* Make frame */
00271    s->f.frametype = AST_FRAME_VOICE;
00272    s->f.subclass = s->format;
00273    s->f.data = s->framedata + AST_FRIENDLY_OFFSET;
00274    s->f.offset = AST_FRIENDLY_OFFSET;
00275    s->f.datalen = len;
00276    /* Samples will be improper given VAD, but with VAD the concept really doesn't even exist */
00277    s->f.samples = len * s->samplesperbyte;   /* XXX rounding */
00278    s->f.delivery = s->delivery;
00279    /* Fill Data */
00280    memcpy(s->f.data, s->data, len);
00281    s->len -= len;
00282    /* Move remaining data to the front if applicable */
00283    if (s->len) {
00284       /* In principle this should all be fine because if we are sending
00285          G.729 VAD, the next timestamp will take over anyawy */
00286       memmove(s->data, s->data + len, s->len);
00287       if (!ast_tvzero(s->delivery)) {
00288          /* If we have delivery time, increment it, otherwise, leave it at 0 */
00289          s->delivery = ast_tvadd(s->delivery, ast_samp2tv(s->f.samples, 8000));
00290       }
00291    }
00292    /* Return frame */
00293    return &s->f;
00294 }
00295 
00296 void ast_smoother_free(struct ast_smoother *s)
00297 {
00298    free(s);
00299 }
00300 
00301 static struct ast_frame *ast_frame_header_new(void)
00302 {
00303    struct ast_frame *f;
00304 
00305 #if !defined(LOW_MEMORY)
00306    struct ast_frame_cache *frames;
00307 
00308    if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames)))) {
00309       if ((f = AST_LIST_REMOVE_HEAD(&frames->list, frame_list))) {
00310          size_t mallocd_len = f->mallocd_hdr_len;
00311          memset(f, 0, sizeof(*f));
00312          f->mallocd_hdr_len = mallocd_len;
00313          f->mallocd = AST_MALLOCD_HDR;
00314          frames->size--;
00315          return f;
00316       }
00317    }
00318    if (!(f = ast_calloc_cache(1, sizeof(*f))))
00319       return NULL;
00320 #else
00321    if (!(f = ast_calloc(1, sizeof(*f))))
00322       return NULL;
00323 #endif
00324 
00325    f->mallocd_hdr_len = sizeof(*f);
00326    
00327    return f;
00328 }
00329 
00330 #if !defined(LOW_MEMORY)
00331 static void frame_cache_cleanup(void *data)
00332 {
00333    struct ast_frame_cache *frames = data;
00334    struct ast_frame *f;
00335 
00336    while ((f = AST_LIST_REMOVE_HEAD(&frames->list, frame_list)))
00337       free(f);
00338    
00339    free(frames);
00340 }
00341 #endif
00342 
00343 static void __frame_free(struct ast_frame *fr, int cache)
00344 {
00345    if (!fr->mallocd)
00346       return;
00347 
00348 #if !defined(LOW_MEMORY)
00349    if (cache && fr->mallocd == AST_MALLOCD_HDR) {
00350       /* Cool, only the header is malloc'd, let's just cache those for now 
00351        * to keep things simple... */
00352       struct ast_frame_cache *frames;
00353 
00354       if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames))) &&
00355           (frames->size < FRAME_CACHE_MAX_SIZE)) {
00356          AST_LIST_INSERT_HEAD(&frames->list, fr, frame_list);
00357          frames->size++;
00358          return;
00359       }
00360    }
00361 #endif
00362    
00363    if (fr->mallocd & AST_MALLOCD_DATA) {
00364       if (fr->data) 
00365          free(fr->data - fr->offset);
00366    }
00367    if (fr->mallocd & AST_MALLOCD_SRC) {
00368       if (fr->src)
00369          free((void *) fr->src);
00370    }
00371    if (fr->mallocd & AST_MALLOCD_HDR) {
00372       free(fr);
00373    }
00374 }
00375 
00376 
00377 void ast_frame_free(struct ast_frame *frame, int cache)
00378 {
00379    struct ast_frame *next;
00380 
00381    for (next = AST_LIST_NEXT(frame, frame_list);
00382         frame;
00383         frame = next, next = frame ? AST_LIST_NEXT(frame, frame_list) : NULL) {
00384       __frame_free(frame, cache);
00385    }
00386 }
00387 
00388 /*!
00389  * \brief 'isolates' a frame by duplicating non-malloc'ed components
00390  * (header, src, data).
00391  * On return all components are malloc'ed
00392  */
00393 struct ast_frame *ast_frisolate(struct ast_frame *fr)
00394 {
00395    struct ast_frame *out;
00396    void *newdata;
00397 
00398    /* if none of the existing frame is malloc'd, let ast_frdup() do it
00399       since it is more efficient
00400    */
00401    if (fr->mallocd == 0) {
00402       return ast_frdup(fr);
00403    }
00404 
00405    /* if everything is already malloc'd, we are done */
00406    if ((fr->mallocd & (AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA)) ==
00407        (AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA)) {
00408       return fr;
00409    }
00410 
00411    if (!(fr->mallocd & AST_MALLOCD_HDR)) {
00412       /* Allocate a new header if needed */
00413       if (!(out = ast_frame_header_new())) {
00414          return NULL;
00415       }
00416       out->frametype = fr->frametype;
00417       out->subclass = fr->subclass;
00418       out->datalen = fr->datalen;
00419       out->samples = fr->samples;
00420       out->offset = fr->offset;
00421       /* Copy the timing data */
00422       ast_copy_flags(out, fr, AST_FRFLAG_HAS_TIMING_INFO);
00423       if (ast_test_flag(fr, AST_FRFLAG_HAS_TIMING_INFO)) {
00424          out->ts = fr->ts;
00425          out->len = fr->len;
00426          out->seqno = fr->seqno;
00427       }
00428    } else {
00429       out = fr;
00430    }
00431    
00432    if (!(fr->mallocd & AST_MALLOCD_SRC) && fr->src) {
00433       if (!(out->src = ast_strdup(fr->src))) {
00434          if (out != fr) {
00435             free(out);
00436          }
00437          return NULL;
00438       }
00439    } else {
00440       out->src = fr->src;
00441       fr->src = NULL;
00442       fr->mallocd &= ~AST_MALLOCD_SRC;
00443    }
00444    
00445    if (!(fr->mallocd & AST_MALLOCD_DATA))  {
00446       if (!(newdata = ast_malloc(fr->datalen + AST_FRIENDLY_OFFSET))) {
00447          if (out->src != fr->src) {
00448             free((void *) out->src);
00449          }
00450          if (out != fr) {
00451             free(out);
00452          }
00453          return NULL;
00454       }
00455       newdata += AST_FRIENDLY_OFFSET;
00456       out->offset = AST_FRIENDLY_OFFSET;
00457       out->datalen = fr->datalen;
00458       memcpy(newdata, fr->data, fr->datalen);
00459       out->data = newdata;
00460    } else {
00461       out->data = fr->data;
00462       fr->data = NULL;
00463       fr->mallocd &= ~AST_MALLOCD_DATA;
00464    }
00465 
00466    out->mallocd = AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA;
00467    
00468    return out;
00469 }
00470 
00471 struct ast_frame *ast_frdup(const struct ast_frame *f)
00472 {
00473    struct ast_frame *out = NULL;
00474    int len, srclen = 0;
00475    void *buf = NULL;
00476 
00477 #if !defined(LOW_MEMORY)
00478    struct ast_frame_cache *frames;
00479 #endif
00480 
00481    /* Start with standard stuff */
00482    len = sizeof(*out) + AST_FRIENDLY_OFFSET + f->datalen;
00483    /* If we have a source, add space for it */
00484    /*
00485     * XXX Watch out here - if we receive a src which is not terminated
00486     * properly, we can be easily attacked. Should limit the size we deal with.
00487     */
00488    if (f->src)
00489       srclen = strlen(f->src);
00490    if (srclen > 0)
00491       len += srclen + 1;
00492    
00493 #if !defined(LOW_MEMORY)
00494    if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames)))) {
00495       AST_LIST_TRAVERSE_SAFE_BEGIN(&frames->list, out, frame_list) {
00496          if (out->mallocd_hdr_len >= len) {
00497             size_t mallocd_len = out->mallocd_hdr_len;
00498             AST_LIST_REMOVE_CURRENT(&frames->list, 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 }
00544 
00545 void ast_swapcopy_samples(void *dst, const void *src, int samples)
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 }
00554 
00555 
00556 struct ast_format_list *ast_get_format_list_index(int index) 
00557 {
00558    return &AST_FORMAT_LIST[index];
00559 }
00560 
00561 struct ast_format_list *ast_get_format_list(size_t *size) 
00562 {
00563    *size = (sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]));
00564    return AST_FORMAT_LIST;
00565 }
00566 
00567 char* ast_getformatname(int format)
00568 {
00569    int x;
00570    char *ret = "unknown";
00571    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
00572       if(AST_FORMAT_LIST[x].visible && AST_FORMAT_LIST[x].bits == format) {
00573          ret = AST_FORMAT_LIST[x].name;
00574          break;
00575       }
00576    }
00577    return ret;
00578 }
00579 
00580 char *ast_getformatname_multiple(char *buf, size_t size, int format)
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 < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
00594       if (AST_FORMAT_LIST[x].visible && (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       snprintf(start, size, "nothing)");
00603    else if (size > 1)
00604       *(end -1) = ')';
00605    return buf;
00606 }
00607 
00608 static struct ast_codec_alias_table {
00609    char *alias;
00610    char *realname;
00611 } ast_codec_alias_table[] = {
00612    { "slinear", "slin"},
00613    { "g723.1", "g723"},
00614 };
00615 
00616 static const char *ast_expand_codec_alias(const char *in)
00617 {
00618    int x;
00619 
00620    for (x = 0; x < sizeof(ast_codec_alias_table) / sizeof(ast_codec_alias_table[0]); x++) {
00621       if(!strcmp(in,ast_codec_alias_table[x].alias))
00622          return ast_codec_alias_table[x].realname;
00623    }
00624    return in;
00625 }
00626 
00627 int ast_getformatbyname(const char *name)
00628 {
00629    int x, all, format = 0;
00630 
00631    all = strcasecmp(name, "all") ? 0 : 1;
00632    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
00633       if(AST_FORMAT_LIST[x].visible && (all || 
00634            !strcasecmp(AST_FORMAT_LIST[x].name,name) ||
00635            !strcasecmp(AST_FORMAT_LIST[x].name,ast_expand_codec_alias(name)))) {
00636          format |= AST_FORMAT_LIST[x].bits;
00637          if(!all)
00638             break;
00639       }
00640    }
00641 
00642    return format;
00643 }
00644 
00645 char *ast_codec2str(int codec)
00646 {
00647    int x;
00648    char *ret = "unknown";
00649    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
00650       if(AST_FORMAT_LIST[x].visible && AST_FORMAT_LIST[x].bits == codec) {
00651          ret = AST_FORMAT_LIST[x].desc;
00652          break;
00653       }
00654    }
00655    return ret;
00656 }
00657 
00658 static int show_codecs_deprecated(int fd, int argc, char *argv[])
00659 {
00660    int i, found=0;
00661    char hex[25];
00662    
00663    if ((argc < 2) || (argc > 3))
00664       return RESULT_SHOWUSAGE;
00665 
00666    if (!ast_opt_dont_warn)
00667       ast_cli(fd, "Disclaimer: this command is for informational purposes only.\n"
00668             "\tIt does not indicate anything about your configuration.\n");
00669 
00670    ast_cli(fd, "%11s %9s %10s   TYPE   %8s   %s\n","INT","BINARY","HEX","NAME","DESC");
00671    ast_cli(fd, "--------------------------------------------------------------------------------\n");
00672    if ((argc == 2) || (!strcasecmp(argv[1],"audio"))) {
00673       found = 1;
00674       for (i=0;i<13;i++) {
00675          snprintf(hex,25,"(0x%x)",1<<i);
00676          ast_cli(fd, "%11u (1 << %2d) %10s  audio   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00677       }
00678    }
00679 
00680    if ((argc == 2) || (!strcasecmp(argv[1],"image"))) {
00681       found = 1;
00682       for (i=16;i<18;i++) {
00683          snprintf(hex,25,"(0x%x)",1<<i);
00684          ast_cli(fd, "%11u (1 << %2d) %10s  image   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00685       }
00686    }
00687 
00688    if ((argc == 2) || (!strcasecmp(argv[1],"video"))) {
00689       found = 1;
00690       for (i=18;i<22;i++) {
00691          snprintf(hex,25,"(0x%x)",1<<i);
00692          ast_cli(fd, "%11u (1 << %2d) %10s  video   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00693       }
00694    }
00695 
00696    if (! found)
00697       return RESULT_SHOWUSAGE;
00698    else
00699       return RESULT_SUCCESS;
00700 }
00701 
00702 static int show_codecs(int fd, int argc, char *argv[])
00703 {
00704    int i, found=0;
00705    char hex[25];
00706    
00707    if ((argc < 3) || (argc > 4))
00708       return RESULT_SHOWUSAGE;
00709 
00710    if (!ast_opt_dont_warn)
00711       ast_cli(fd, "Disclaimer: this command is for informational purposes only.\n"
00712             "\tIt does not indicate anything about your configuration.\n");
00713 
00714    ast_cli(fd, "%11s %9s %10s   TYPE   %8s   %s\n","INT","BINARY","HEX","NAME","DESC");
00715    ast_cli(fd, "--------------------------------------------------------------------------------\n");
00716    if ((argc == 3) || (!strcasecmp(argv[3],"audio"))) {
00717       found = 1;
00718       for (i=0;i<13;i++) {
00719          snprintf(hex,25,"(0x%x)",1<<i);
00720          ast_cli(fd, "%11u (1 << %2d) %10s  audio   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00721       }
00722    }
00723 
00724    if ((argc == 3) || (!strcasecmp(argv[3],"image"))) {
00725       found = 1;
00726       for (i=16;i<18;i++) {
00727          snprintf(hex,25,"(0x%x)",1<<i);
00728          ast_cli(fd, "%11u (1 << %2d) %10s  image   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00729       }
00730    }
00731 
00732    if ((argc == 3) || (!strcasecmp(argv[3],"video"))) {
00733       found = 1;
00734       for (i=18;i<22;i++) {
00735          snprintf(hex,25,"(0x%x)",1<<i);
00736          ast_cli(fd, "%11u (1 << %2d) %10s  video   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00737       }
00738    }
00739 
00740    if (! found)
00741       return RESULT_SHOWUSAGE;
00742    else
00743       return RESULT_SUCCESS;
00744 }
00745 
00746 static char frame_show_codecs_usage[] =
00747 "Usage: core show codecs [audio|video|image]\n"
00748 "       Displays codec mapping\n";
00749 
00750 static int show_codec_n_deprecated(int fd, int argc, char *argv[])
00751 {
00752    int codec, i, found=0;
00753 
00754    if (argc != 3)
00755       return RESULT_SHOWUSAGE;
00756 
00757    if (sscanf(argv[2],"%30d",&codec) != 1)
00758       return RESULT_SHOWUSAGE;
00759 
00760    for (i = 0; i < 32; i++)
00761       if (codec & (1 << i)) {
00762          found = 1;
00763          ast_cli(fd, "%11u (1 << %2d)  %s\n",1 << i,i,ast_codec2str(1<<i));
00764       }
00765 
00766    if (!found)
00767       ast_cli(fd, "Codec %d not found\n", codec);
00768 
00769    return RESULT_SUCCESS;
00770 }
00771 
00772 static int show_codec_n(int fd, int argc, char *argv[])
00773 {
00774    int codec, i, found=0;
00775 
00776    if (argc != 4)
00777       return RESULT_SHOWUSAGE;
00778 
00779    if (sscanf(argv[3],"%30d",&codec) != 1)
00780       return RESULT_SHOWUSAGE;
00781 
00782    for (i = 0; i < 32; i++)
00783       if (codec & (1 << i)) {
00784          found = 1;
00785          ast_cli(fd, "%11u (1 << %2d)  %s\n",1 << i,i,ast_codec2str(1<<i));
00786       }
00787 
00788    if (!found)
00789       ast_cli(fd, "Codec %d not found\n", codec);
00790 
00791    return RESULT_SUCCESS;
00792 }
00793 
00794 static char frame_show_codec_n_usage[] =
00795 "Usage: core show codec <number>\n"
00796 "       Displays codec mapping\n";
00797 
00798 /*! Dump a frame for debugging purposes */
00799 void ast_frame_dump(const char *name, struct ast_frame *f, char *prefix)
00800 {
00801    const char noname[] = "unknown";
00802    char ftype[40] = "Unknown Frametype";
00803    char cft[80];
00804    char subclass[40] = "Unknown Subclass";
00805    char csub[80];
00806    char moreinfo[40] = "";
00807    char cn[60];
00808    char cp[40];
00809    char cmn[40];
00810 
00811    if (!name)
00812       name = noname;
00813 
00814 
00815    if (!f) {
00816       ast_verbose("%s [ %s (NULL) ] [%s]\n", 
00817          term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00818          term_color(cft, "HANGUP", COLOR_BRRED, COLOR_BLACK, sizeof(cft)), 
00819          term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00820       return;
00821    }
00822    /* XXX We should probably print one each of voice and video when the format changes XXX */
00823    if (f->frametype == AST_FRAME_VOICE)
00824       return;
00825    if (f->frametype == AST_FRAME_VIDEO)
00826       return;
00827    switch(f->frametype) {
00828    case AST_FRAME_DTMF_BEGIN:
00829       strcpy(ftype, "DTMF Begin");
00830       subclass[0] = f->subclass;
00831       subclass[1] = '\0';
00832       break;
00833    case AST_FRAME_DTMF_END:
00834       strcpy(ftype, "DTMF End");
00835       subclass[0] = f->subclass;
00836       subclass[1] = '\0';
00837       break;
00838    case AST_FRAME_CONTROL:
00839       strcpy(ftype, "Control");
00840       switch(f->subclass) {
00841       case AST_CONTROL_HANGUP:
00842          strcpy(subclass, "Hangup");
00843          break;
00844       case AST_CONTROL_RING:
00845          strcpy(subclass, "Ring");
00846          break;
00847       case AST_CONTROL_RINGING:
00848          strcpy(subclass, "Ringing");
00849          break;
00850       case AST_CONTROL_ANSWER:
00851          strcpy(subclass, "Answer");
00852          break;
00853       case AST_CONTROL_BUSY:
00854          strcpy(subclass, "Busy");
00855          break;
00856       case AST_CONTROL_TAKEOFFHOOK:
00857          strcpy(subclass, "Take Off Hook");
00858          break;
00859       case AST_CONTROL_OFFHOOK:
00860          strcpy(subclass, "Line Off Hook");
00861          break;
00862       case AST_CONTROL_CONGESTION:
00863          strcpy(subclass, "Congestion");
00864          break;
00865       case AST_CONTROL_FLASH:
00866          strcpy(subclass, "Flash");
00867          break;
00868       case AST_CONTROL_WINK:
00869          strcpy(subclass, "Wink");
00870          break;
00871       case AST_CONTROL_OPTION:
00872          strcpy(subclass, "Option");
00873          break;
00874       case AST_CONTROL_RADIO_KEY:
00875          strcpy(subclass, "Key Radio");
00876          break;
00877       case AST_CONTROL_RADIO_UNKEY:
00878          strcpy(subclass, "Unkey Radio");
00879          break;
00880       case AST_CONTROL_PROGRESS:
00881          strcpy(subclass, "Call Progress");
00882          break;
00883       case AST_CONTROL_PROCEEDING:
00884          strcpy(subclass, "Proceeding");
00885          break;
00886       case AST_CONTROL_HOLD:
00887         strcpy(subclass, "Hold");
00888         break;
00889       case AST_CONTROL_UNHOLD:
00890         strcpy(subclass, "UnHold");
00891         break;
00892       case -1:
00893          strcpy(subclass, "Stop generators");
00894          break;
00895       default:
00896          snprintf(subclass, sizeof(subclass), "Unknown control '%d'", f->subclass);
00897       }
00898       break;
00899    case AST_FRAME_NULL:
00900       strcpy(ftype, "Null Frame");
00901       strcpy(subclass, "N/A");
00902       break;
00903    case AST_FRAME_IAX:
00904       /* Should never happen */
00905       strcpy(ftype, "IAX Specific");
00906       snprintf(subclass, sizeof(subclass), "IAX Frametype %d", f->subclass);
00907       break;
00908    case AST_FRAME_TEXT:
00909       strcpy(ftype, "Text");
00910       strcpy(subclass, "N/A");
00911       ast_copy_string(moreinfo, f->data, sizeof(moreinfo));
00912       break;
00913    case AST_FRAME_IMAGE:
00914       strcpy(ftype, "Image");
00915       snprintf(subclass, sizeof(subclass), "Image format %s\n", ast_getformatname(f->subclass));
00916       break;
00917    case AST_FRAME_HTML:
00918       strcpy(ftype, "HTML");
00919       switch(f->subclass) {
00920       case AST_HTML_URL:
00921          strcpy(subclass, "URL");
00922          ast_copy_string(moreinfo, f->data, sizeof(moreinfo));
00923          break;
00924       case AST_HTML_DATA:
00925          strcpy(subclass, "Data");
00926          break;
00927       case AST_HTML_BEGIN:
00928          strcpy(subclass, "Begin");
00929          break;
00930       case AST_HTML_END:
00931          strcpy(subclass, "End");
00932          break;
00933       case AST_HTML_LDCOMPLETE:
00934          strcpy(subclass, "Load Complete");
00935          break;
00936       case AST_HTML_NOSUPPORT:
00937          strcpy(subclass, "No Support");
00938          break;
00939       case AST_HTML_LINKURL:
00940          strcpy(subclass, "Link URL");
00941          ast_copy_string(moreinfo, f->data, sizeof(moreinfo));
00942          break;
00943       case AST_HTML_UNLINK:
00944          strcpy(subclass, "Unlink");
00945          break;
00946       case AST_HTML_LINKREJECT:
00947          strcpy(subclass, "Link Reject");
00948          break;
00949       default:
00950          snprintf(subclass, sizeof(subclass), "Unknown HTML frame '%d'\n", f->subclass);
00951          break;
00952       }
00953       break;
00954    case AST_FRAME_MODEM:
00955       strcpy(ftype, "Modem");
00956       switch (f->subclass) {
00957       case AST_MODEM_T38:
00958          strcpy(subclass, "T.38");
00959          break;
00960       case AST_MODEM_V150:
00961          strcpy(subclass, "V.150");
00962          break;
00963       default:
00964          snprintf(subclass, sizeof(subclass), "Unknown MODEM frame '%d'\n", f->subclass);
00965          break;
00966       }
00967       break;
00968    default:
00969       snprintf(ftype, sizeof(ftype), "Unknown Frametype '%d'", f->frametype);
00970    }
00971    if (!ast_strlen_zero(moreinfo))
00972       ast_verbose("%s [ TYPE: %s (%d) SUBCLASS: %s (%d) '%s' ] [%s]\n",  
00973              term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00974              term_color(cft, ftype, COLOR_BRRED, COLOR_BLACK, sizeof(cft)),
00975              f->frametype, 
00976              term_color(csub, subclass, COLOR_BRCYAN, COLOR_BLACK, sizeof(csub)),
00977              f->subclass, 
00978              term_color(cmn, moreinfo, COLOR_BRGREEN, COLOR_BLACK, sizeof(cmn)),
00979              term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00980    else
00981       ast_verbose("%s [ TYPE: %s (%d) SUBCLASS: %s (%d) ] [%s]\n",  
00982              term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00983              term_color(cft, ftype, COLOR_BRRED, COLOR_BLACK, sizeof(cft)),
00984              f->frametype, 
00985              term_color(csub, subclass, COLOR_BRCYAN, COLOR_BLACK, sizeof(csub)),
00986              f->subclass, 
00987              term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00988 }
00989 
00990 
00991 /* Builtin Asterisk CLI-commands for debugging */
00992 static struct ast_cli_entry cli_show_codecs = {
00993    { "show", "codecs", NULL },
00994    show_codecs_deprecated, NULL,
00995    NULL };
00996 
00997 static struct ast_cli_entry cli_show_audio_codecs = {
00998    { "show", "audio", "codecs", NULL },
00999    show_codecs_deprecated, NULL,
01000    NULL };
01001 
01002 static struct ast_cli_entry cli_show_video_codecs = {
01003    { "show", "video", "codecs", NULL },
01004    show_codecs_deprecated, NULL,
01005    NULL };
01006 
01007 static struct ast_cli_entry cli_show_image_codecs = {
01008    { "show", "image", "codecs", NULL },
01009    show_codecs_deprecated, NULL,
01010    NULL };
01011 
01012 static struct ast_cli_entry cli_show_codec = {
01013    { "show", "codec", NULL },
01014    show_codec_n_deprecated, NULL,
01015    NULL };
01016 
01017 static struct ast_cli_entry my_clis[] = {
01018    { { "core", "show", "codecs", NULL },
01019    show_codecs, "Displays a list of codecs",
01020    frame_show_codecs_usage, NULL, &cli_show_codecs },
01021 
01022    { { "core", "show", "audio", "codecs", NULL },
01023    show_codecs, "Displays a list of audio codecs",
01024    frame_show_codecs_usage, NULL, &cli_show_audio_codecs },
01025 
01026    { { "core", "show", "video", "codecs", NULL },
01027    show_codecs, "Displays a list of video codecs",
01028    frame_show_codecs_usage, NULL, &cli_show_video_codecs },
01029 
01030    { { "core", "show", "image", "codecs", NULL },
01031    show_codecs, "Displays a list of image codecs",
01032    frame_show_codecs_usage, NULL, &cli_show_image_codecs },
01033 
01034    { { "core", "show", "codec", NULL },
01035    show_codec_n, "Shows a specific codec",
01036    frame_show_codec_n_usage, NULL, &cli_show_codec },
01037 };
01038 
01039 int init_framer(void)
01040 {
01041    ast_cli_register_multiple(my_clis, sizeof(my_clis) / sizeof(struct ast_cli_entry));
01042    return 0;   
01043 }
01044 
01045 void ast_codec_pref_convert(struct ast_codec_pref *pref, char *buf, size_t size, int right) 
01046 {
01047    int x, differential = (int) 'A', mem;
01048    char *from, *to;
01049 
01050    if(right) {
01051       from = pref->order;
01052       to = buf;
01053       mem = size;
01054    } else {
01055       to = pref->order;
01056       from = buf;
01057       mem = 32;
01058    }
01059 
01060    memset(to, 0, mem);
01061    for (x = 0; x < 32 ; x++) {
01062       if(!from[x])
01063          break;
01064       to[x] = right ? (from[x] + differential) : (from[x] - differential);
01065    }
01066 }
01067 
01068 int ast_codec_pref_string(struct ast_codec_pref *pref, char *buf, size_t size) 
01069 {
01070    int x, codec; 
01071    size_t total_len, slen;
01072    char *formatname;
01073    
01074    memset(buf,0,size);
01075    total_len = size;
01076    buf[0] = '(';
01077    total_len--;
01078    for(x = 0; x < 32 ; x++) {
01079       if(total_len <= 0)
01080          break;
01081       if(!(codec = ast_codec_pref_index(pref,x)))
01082          break;
01083       if((formatname = ast_getformatname(codec))) {
01084          slen = strlen(formatname);
01085          if(slen > total_len)
01086             break;
01087          strncat(buf, formatname, total_len - 1); /* safe */
01088          total_len -= slen;
01089       }
01090       if(total_len && x < 31 && ast_codec_pref_index(pref , x + 1)) {
01091          strncat(buf, "|", total_len - 1); /* safe */
01092          total_len--;
01093       }
01094    }
01095    if(total_len) {
01096       strncat(buf, ")", total_len - 1); /* safe */
01097       total_len--;
01098    }
01099 
01100    return size - total_len;
01101 }
01102 
01103 int ast_codec_pref_index(struct ast_codec_pref *pref, int index) 
01104 {
01105    int slot = 0;
01106 
01107    
01108    if((index >= 0) && (index < sizeof(pref->order))) {
01109       slot = pref->order[index];
01110    }
01111 
01112    return slot ? AST_FORMAT_LIST[slot-1].bits : 0;
01113 }
01114 
01115 /*! \brief Remove codec from pref list */
01116 void ast_codec_pref_remove(struct ast_codec_pref *pref, int format)
01117 {
01118    struct ast_codec_pref oldorder;
01119    int x, y = 0;
01120    int slot;
01121    int size;
01122 
01123    if(!pref->order[0])
01124       return;
01125 
01126    memcpy(&oldorder, pref, sizeof(oldorder));
01127    memset(pref, 0, sizeof(*pref));
01128 
01129    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01130       slot = oldorder.order[x];
01131       size = oldorder.framing[x];
01132       if(! slot)
01133          break;
01134       if(AST_FORMAT_LIST[slot-1].bits != format) {
01135          pref->order[y] = slot;
01136          pref->framing[y++] = size;
01137       }
01138    }
01139    
01140 }
01141 
01142 /*! \brief Append codec to list */
01143 int ast_codec_pref_append(struct ast_codec_pref *pref, int format)
01144 {
01145    int x, newindex = 0;
01146 
01147    ast_codec_pref_remove(pref, format);
01148 
01149    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01150       if(AST_FORMAT_LIST[x].bits == format) {
01151          newindex = x + 1;
01152          break;
01153       }
01154    }
01155 
01156    if(newindex) {
01157       for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01158          if(!pref->order[x]) {
01159             pref->order[x] = newindex;
01160             break;
01161          }
01162       }
01163    }
01164 
01165    return x;
01166 }
01167 
01168 /*! \brief Prepend codec to list */
01169 void ast_codec_pref_prepend(struct ast_codec_pref *pref, int format, int only_if_existing)
01170 {
01171    int x, newindex = 0;
01172 
01173    /* First step is to get the codecs "index number" */
01174    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01175       if (AST_FORMAT_LIST[x].bits == format) {
01176          newindex = x + 1;
01177          break;
01178       }
01179    }
01180    /* Done if its unknown */
01181    if (!newindex)
01182       return;
01183 
01184    /* Now find any existing occurrence, or the end */
01185    for (x = 0; x < 32; x++) {
01186       if (!pref->order[x] || pref->order[x] == newindex)
01187          break;
01188    }
01189 
01190    if (only_if_existing && !pref->order[x])
01191       return;
01192 
01193    /* Move down to make space to insert - either all the way to the end,
01194       or as far as the existing location (which will be overwritten) */
01195    for (; x > 0; x--) {
01196       pref->order[x] = pref->order[x - 1];
01197       pref->framing[x] = pref->framing[x - 1];
01198    }
01199 
01200    /* And insert the new entry */
01201    pref->order[0] = newindex;
01202    pref->framing[0] = 0; /* ? */
01203 }
01204 
01205 /*! \brief Set packet size for codec */
01206 int ast_codec_pref_setsize(struct ast_codec_pref *pref, int format, int framems)
01207 {
01208    int x, index = -1;
01209 
01210    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01211       if(AST_FORMAT_LIST[x].bits == format) {
01212          index = x;
01213          break;
01214       }
01215    }
01216 
01217    if(index < 0)
01218       return -1;
01219 
01220    /* size validation */
01221    if(!framems)
01222       framems = AST_FORMAT_LIST[index].def_ms;
01223 
01224    if(AST_FORMAT_LIST[index].inc_ms && framems % AST_FORMAT_LIST[index].inc_ms) /* avoid division by zero */
01225       framems -= framems % AST_FORMAT_LIST[index].inc_ms;
01226 
01227    if(framems < AST_FORMAT_LIST[index].min_ms)
01228       framems = AST_FORMAT_LIST[index].min_ms;
01229 
01230    if(framems > AST_FORMAT_LIST[index].max_ms)
01231       framems = AST_FORMAT_LIST[index].max_ms;
01232 
01233 
01234    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01235       if(pref->order[x] == (index + 1)) {
01236          pref->framing[x] = framems;
01237          break;
01238       }
01239    }
01240 
01241    return x;
01242 }
01243 
01244 /*! \brief Get packet size for codec */
01245 struct ast_format_list ast_codec_pref_getsize(struct ast_codec_pref *pref, int format)
01246 {
01247    int x, index = -1, framems = 0;
01248    struct ast_format_list fmt = {0};
01249 
01250    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01251       if(AST_FORMAT_LIST[x].bits == format) {
01252          fmt = AST_FORMAT_LIST[x];
01253          index = x;
01254          break;
01255       }
01256    }
01257 
01258    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01259       if(pref->order[x] == (index + 1)) {
01260          framems = pref->framing[x];
01261          break;
01262       }
01263    }
01264 
01265    /* size validation */
01266    if(!framems)
01267       framems = AST_FORMAT_LIST[index].def_ms;
01268 
01269    if(AST_FORMAT_LIST[index].inc_ms && framems % AST_FORMAT_LIST[index].inc_ms) /* avoid division by zero */
01270       framems -= framems % AST_FORMAT_LIST[index].inc_ms;
01271 
01272    if(framems < AST_FORMAT_LIST[index].min_ms)
01273       framems = AST_FORMAT_LIST[index].min_ms;
01274 
01275    if(framems > AST_FORMAT_LIST[index].max_ms)
01276       framems = AST_FORMAT_LIST[index].max_ms;
01277 
01278    fmt.cur_ms = framems;
01279 
01280    return fmt;
01281 }
01282 
01283 /*! \brief Pick a codec */
01284 int ast_codec_choose(struct ast_codec_pref *pref, int formats, int find_best)
01285 {
01286    int x, ret = 0, slot;
01287 
01288    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01289       slot = pref->order[x];
01290 
01291       if (!slot)
01292          break;
01293       if (formats & AST_FORMAT_LIST[slot-1].bits) {
01294          ret = AST_FORMAT_LIST[slot-1].bits;
01295          break;
01296       }
01297    }
01298    if(ret & AST_FORMAT_AUDIO_MASK)
01299       return ret;
01300 
01301    if (option_debug > 3)
01302       ast_log(LOG_DEBUG, "Could not find preferred codec - %s\n", find_best ? "Going for the best codec" : "Returning zero codec");
01303 
01304       return find_best ? ast_best_codec(formats) : 0;
01305 }
01306 
01307 void ast_parse_allow_disallow(struct ast_codec_pref *pref, int *mask, const char *list, int allowing) 
01308 {
01309    char *parse = NULL, *this = NULL, *psize = NULL;
01310    int format = 0, framems = 0;
01311 
01312    parse = ast_strdupa(list);
01313    while ((this = strsep(&parse, ","))) {
01314       framems = 0;
01315       if ((psize = strrchr(this, ':'))) {
01316          *psize++ = '\0';
01317          if (option_debug)
01318             ast_log(LOG_DEBUG,"Packetization for codec: %s is %s\n", this, psize);
01319          framems = atoi(psize);
01320          if (framems < 0)
01321             framems = 0;
01322       }
01323       if (!(format = ast_getformatbyname(this))) {
01324          ast_log(LOG_WARNING, "Cannot %s unknown format '%s'\n", allowing ? "allow" : "disallow", this);
01325          continue;
01326       }
01327 
01328       if (mask) {
01329          if (allowing)
01330             *mask |= format;
01331          else
01332             *mask &= ~format;
01333       }
01334 
01335       /* Set up a preference list for audio. Do not include video in preferences 
01336          since we can not transcode video and have to use whatever is offered
01337        */
01338       if (pref && (format & AST_FORMAT_AUDIO_MASK)) {
01339          if (strcasecmp(this, "all")) {
01340             if (allowing) {
01341                ast_codec_pref_append(pref, format);
01342                ast_codec_pref_setsize(pref, format, framems);
01343             }
01344             else
01345                ast_codec_pref_remove(pref, format);
01346          } else if (!allowing) {
01347             memset(pref, 0, sizeof(*pref));
01348          }
01349       }
01350    }
01351 }
01352 
01353 static int g723_len(unsigned char buf)
01354 {
01355    enum frame_type type = buf & TYPE_MASK;
01356 
01357    switch(type) {
01358    case TYPE_DONTSEND:
01359       return 0;
01360       break;
01361    case TYPE_SILENCE:
01362       return 4;
01363       break;
01364    case TYPE_HIGH:
01365       return 24;
01366       break;
01367    case TYPE_LOW:
01368       return 20;
01369       break;
01370    default:
01371       ast_log(LOG_WARNING, "Badly encoded frame (%d)\n", type);
01372    }
01373    return -1;
01374 }
01375 
01376 static int g723_samples(unsigned char *buf, int maxlen)
01377 {
01378    int pos = 0;
01379    int samples = 0;
01380    int res;
01381    while(pos < maxlen) {
01382       res = g723_len(buf[pos]);
01383       if (res <= 0)
01384          break;
01385       samples += 240;
01386       pos += res;
01387    }
01388    return samples;
01389 }
01390 
01391 static unsigned char get_n_bits_at(unsigned char *data, int n, int bit)
01392 {
01393    int byte = bit / 8;       /* byte containing first bit */
01394    int rem = 8 - (bit % 8);  /* remaining bits in first byte */
01395    unsigned char ret = 0;
01396    
01397    if (n <= 0 || n > 8)
01398       return 0;
01399 
01400    if (rem < n) {
01401       ret = (data[byte] << (n - rem));
01402       ret |= (data[byte + 1] >> (8 - n + rem));
01403    } else {
01404       ret = (data[byte] >> (rem - n));
01405    }
01406 
01407    return (ret & (0xff >> (8 - n)));
01408 }
01409 
01410 static int speex_get_wb_sz_at(unsigned char *data, int len, int bit)
01411 {
01412    static int SpeexWBSubModeSz[] = {
01413       0, 36, 112, 192,
01414       352, 0, 0, 0 };
01415    int off = bit;
01416    unsigned char c;
01417 
01418    /* skip up to two wideband frames */
01419    if (((len * 8 - off) >= 5) && 
01420       get_n_bits_at(data, 1, off)) {
01421       c = get_n_bits_at(data, 3, off + 1);
01422       off += SpeexWBSubModeSz[c];
01423 
01424       if (((len * 8 - off) >= 5) && 
01425          get_n_bits_at(data, 1, off)) {
01426          c = get_n_bits_at(data, 3, off + 1);
01427          off += SpeexWBSubModeSz[c];
01428 
01429          if (((len * 8 - off) >= 5) && 
01430             get_n_bits_at(data, 1, off)) {
01431             ast_log(LOG_WARNING, "Encountered corrupt speex frame; too many wideband frames in a row.\n");
01432             return -1;
01433          }
01434       }
01435 
01436    }
01437    return off - bit;
01438 }
01439 
01440 static int speex_samples(unsigned char *data, int len)
01441 {
01442    static int SpeexSubModeSz[] = {
01443                5, 43, 119, 160,
01444       220, 300, 364, 492, 
01445       79, 0, 0, 0,
01446       0, 0, 0, 0 };
01447    static int SpeexInBandSz[] = { 
01448       1, 1, 4, 4,
01449       4, 4, 4, 4,
01450       8, 8, 16, 16,
01451       32, 32, 64, 64 };
01452    int bit = 0;
01453    int cnt = 0;
01454    int off;
01455    unsigned char c;
01456 
01457    while ((len * 8 - bit) >= 5) {
01458       /* skip wideband frames */
01459       off = speex_get_wb_sz_at(data, len, bit);
01460       if (off < 0)  {
01461          ast_log(LOG_WARNING, "Had error while reading wideband frames for speex samples\n");
01462          break;
01463       }
01464       bit += off;
01465 
01466       if ((len * 8 - bit) == 0) {
01467          break;
01468       } else if ((len * 8 - bit) < 5) {
01469          ast_log(LOG_WARNING, "Not enough bits remaining after wide band for speex samples.\n");
01470          break;
01471       }
01472 
01473       /* get control bits */
01474       c = get_n_bits_at(data, 5, bit);
01475       bit += 5;
01476 
01477       if (c == 15) { 
01478          /* terminator */
01479          break; 
01480       } else if (c == 14) {
01481          /* in-band signal; next 4 bits contain signal id */
01482          c = get_n_bits_at(data, 4, bit);
01483          bit += 4;
01484          bit += SpeexInBandSz[c];
01485       } else if (c == 13) {
01486          /* user in-band; next 5 bits contain msg len */
01487          c = get_n_bits_at(data, 5, bit);
01488          bit += 5;
01489          bit += c * 8;
01490       } else if (c > 8) {
01491          /* unknown */
01492          break;
01493       } else {
01494          /* skip number bits for submode (less the 5 control bits) */
01495          bit += SpeexSubModeSz[c] - 5;
01496          cnt += 160; /* new frame */
01497       }
01498    }
01499    return cnt;
01500 }
01501 
01502 int ast_codec_get_samples(struct ast_frame *f)
01503 {
01504    int samples=0;
01505    switch(f->subclass) {
01506    case AST_FORMAT_SPEEX:
01507       samples = speex_samples(f->data, f->datalen);
01508       break;
01509    case AST_FORMAT_G723_1:
01510                 samples = g723_samples(f->data, f->datalen);
01511       break;
01512    case AST_FORMAT_ILBC:
01513       samples = 240 * (f->datalen / 50);
01514       break;
01515    case AST_FORMAT_GSM:
01516       samples = 160 * (f->datalen / 33);
01517       break;
01518    case AST_FORMAT_G729A:
01519       samples = f->datalen * 8;
01520       break;
01521    case AST_FORMAT_SLINEAR:
01522       samples = f->datalen / 2;
01523       break;
01524    case AST_FORMAT_LPC10:
01525                 /* assumes that the RTP packet contains one LPC10 frame */
01526       samples = 22 * 8;
01527       samples += (((char *)(f->data))[7] & 0x1) * 8;
01528       break;
01529    case AST_FORMAT_ULAW:
01530    case AST_FORMAT_ALAW:
01531       samples = f->datalen;
01532       break;
01533    case AST_FORMAT_G722:
01534    case AST_FORMAT_ADPCM:
01535    case AST_FORMAT_G726:
01536    case AST_FORMAT_G726_AAL2:
01537       samples = f->datalen * 2;
01538       break;
01539    default:
01540       ast_log(LOG_WARNING, "Unable to calculate samples for format %s\n", ast_getformatname(f->subclass));
01541    }
01542    return samples;
01543 }
01544 
01545 int ast_codec_get_len(int format, int samples)
01546 {
01547    int len = 0;
01548 
01549    /* XXX Still need speex, g723, and lpc10 XXX */ 
01550    switch(format) {
01551    case AST_FORMAT_ILBC:
01552       len = (samples / 240) * 50;
01553       break;
01554    case AST_FORMAT_GSM:
01555       len = (samples / 160) * 33;
01556       break;
01557    case AST_FORMAT_G729A:
01558       len = samples / 8;
01559       break;
01560    case AST_FORMAT_SLINEAR:
01561       len = samples * 2;
01562       break;
01563    case AST_FORMAT_ULAW:
01564    case AST_FORMAT_ALAW:
01565       len = samples;
01566       break;
01567    case AST_FORMAT_G722:
01568    case AST_FORMAT_ADPCM:
01569    case AST_FORMAT_G726:
01570    case AST_FORMAT_G726_AAL2:
01571       len = samples / 2;
01572       break;
01573    default:
01574       ast_log(LOG_WARNING, "Unable to calculate sample length for format %s\n", ast_getformatname(format));
01575    }
01576 
01577    return len;
01578 }
01579 
01580 int ast_frame_adjust_volume(struct ast_frame *f, int adjustment)
01581 {
01582    int count;
01583    short *fdata = f->data;
01584    short adjust_value = abs(adjustment);
01585 
01586    if ((f->frametype != AST_FRAME_VOICE) || (f->subclass != AST_FORMAT_SLINEAR))
01587       return -1;
01588 
01589    if (!adjustment)
01590       return 0;
01591 
01592    for (count = 0; count < f->samples; count++) {
01593       if (adjustment > 0) {
01594          ast_slinear_saturated_multiply(&fdata[count], &adjust_value);
01595       } else if (adjustment < 0) {
01596          ast_slinear_saturated_divide(&fdata[count], &adjust_value);
01597       }
01598    }
01599 
01600    return 0;
01601 }
01602 
01603 int ast_frame_slinear_sum(struct ast_frame *f1, struct ast_frame *f2)
01604 {
01605    int count;
01606    short *data1, *data2;
01607 
01608    if ((f1->frametype != AST_FRAME_VOICE) || (f1->subclass != AST_FORMAT_SLINEAR))
01609       return -1;
01610 
01611    if ((f2->frametype != AST_FRAME_VOICE) || (f2->subclass != AST_FORMAT_SLINEAR))
01612       return -1;
01613 
01614    if (f1->samples != f2->samples)
01615       return -1;
01616 
01617    for (count = 0, data1 = f1->data, data2 = f2->data;
01618         count < f1->samples;
01619         count++, data1++, data2++)
01620       ast_slinear_saturated_add(data1, data2);
01621 
01622    return 0;
01623 }

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