Thu May 14 14:49:02 2009

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: 180372 $")
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 #ifdef TRACE_FRAMES
00051 static int headers;
00052 static AST_LIST_HEAD_STATIC(headerlist, ast_frame);
00053 #endif
00054 
00055 #if !defined(LOW_MEMORY)
00056 static void frame_cache_cleanup(void *data);
00057 
00058 /*! \brief A per-thread cache of frame headers */
00059 AST_THREADSTORAGE_CUSTOM(frame_cache, frame_cache_init, frame_cache_cleanup);
00060 
00061 /*! 
00062  * \brief Maximum ast_frame cache size
00063  *
00064  * In most cases where the frame header cache will be useful, the size
00065  * of the cache will stay very small.  However, it is not always the case that
00066  * the same thread that allocates the frame will be the one freeing them, so
00067  * sometimes a thread will never have any frames in its cache, or the cache
00068  * will never be pulled from.  For the latter case, we limit the maximum size. 
00069  */ 
00070 #define FRAME_CACHE_MAX_SIZE  10
00071 
00072 /*! \brief This is just so ast_frames, a list head struct for holding a list of
00073  *  ast_frame structures, is defined. */
00074 AST_LIST_HEAD_NOLOCK(ast_frames, ast_frame);
00075 
00076 struct ast_frame_cache {
00077    struct ast_frames list;
00078    size_t size;
00079 };
00080 #endif
00081 
00082 #define SMOOTHER_SIZE 8000
00083 
00084 enum frame_type {
00085    TYPE_HIGH,     /* 0x0 */
00086    TYPE_LOW,      /* 0x1 */
00087    TYPE_SILENCE,  /* 0x2 */
00088    TYPE_DONTSEND  /* 0x3 */
00089 };
00090 
00091 #define TYPE_MASK 0x3
00092 
00093 struct ast_smoother {
00094    int size;
00095    int format;
00096    int flags;
00097    float samplesperbyte;
00098    unsigned int opt_needs_swap:1;
00099    struct ast_frame f;
00100    struct timeval delivery;
00101    char data[SMOOTHER_SIZE];
00102    char framedata[SMOOTHER_SIZE + AST_FRIENDLY_OFFSET];
00103    struct ast_frame *opt;
00104    int len;
00105 };
00106 
00107 /*! \brief Definition of supported media formats (codecs) */
00108 static struct ast_format_list AST_FORMAT_LIST[] = {               /*!< Bit number: comment  - Bit numbers are hard coded in show_codec() */
00109    { 1, AST_FORMAT_G723_1 , "g723" , "G.723.1", 24, 30, 300, 30, 30 },  /*!<  1 */
00110    { 1, AST_FORMAT_GSM, "gsm" , "GSM", 33, 20, 300, 20, 20 },     /*!<  2: codec_gsm.c */
00111    { 1, AST_FORMAT_ULAW, "ulaw", "G.711 u-law", 80, 10, 150, 10, 20 },  /*!<  3: codec_ulaw.c */
00112    { 1, AST_FORMAT_ALAW, "alaw", "G.711 A-law", 80, 10, 150, 10, 20 },  /*!<  4: codec_alaw.c */
00113    { 1, AST_FORMAT_G726, "g726", "G.726 RFC3551", 40, 10, 300, 10, 20 },   /*!<  5: codec_g726.c */
00114    { 1, AST_FORMAT_ADPCM, "adpcm" , "ADPCM", 40, 10, 300, 10, 20 },  /*!<  6: codec_adpcm.c */
00115    { 1, AST_FORMAT_SLINEAR, "slin", "16 bit Signed Linear PCM", 160, 10, 70, 10, 20, AST_SMOOTHER_FLAG_BE },   /*!< 7 */
00116    { 1, AST_FORMAT_LPC10, "lpc10", "LPC10", 7, 20, 20, 20, 20 },     /*!<  8: codec_lpc10.c */ 
00117    { 1, AST_FORMAT_G729A, "g729", "G.729A", 10, 10, 230, 10, 40, AST_SMOOTHER_FLAG_G729 },   /*!<  9: Binary commercial distribution */
00118    { 1, AST_FORMAT_SPEEX, "speex", "SpeeX", 10, 10, 60, 10, 20 },    /*!< 10: codec_speex.c */
00119    { 1, AST_FORMAT_ILBC, "ilbc", "iLBC", 50, 30, 30, 30, 30 },    /*!< 11: codec_ilbc.c */ /* inc=30ms - workaround */
00120    { 1, AST_FORMAT_G726_AAL2, "g726aal2", "G.726 AAL2", 40, 10, 300, 10, 20 },   /*!<  12: codec_g726.c */
00121    { 1, AST_FORMAT_G722, "g722", "G.722", 80, 10, 150, 10, 20 },  /*!<  13: codec_g722.c */
00122    { 0, 0, "nothing", "undefined" },
00123    { 0, 0, "nothing", "undefined" },
00124    { 0, 0, "nothing", "undefined" },
00125    { 0, 0, "nothing", "undefined" },
00126    { 0, AST_FORMAT_MAX_AUDIO, "maxaudio", "Maximum audio format" },  
00127    { 1, AST_FORMAT_JPEG, "jpeg", "JPEG image"}, /*!< 17: See format_jpeg.c */
00128    { 1, AST_FORMAT_PNG, "png", "PNG image"}, /*!< 18: Image format */
00129    { 1, AST_FORMAT_H261, "h261", "H.261 Video" },  /*!< 19: Video Passthrough */
00130    { 1, AST_FORMAT_H263, "h263", "H.263 Video" },  /*!< 20: Passthrough support, see format_h263.c */
00131    { 1, AST_FORMAT_H263_PLUS, "h263p", "H.263+ Video" }, /*!< 21: See format_h263.c */
00132    { 1, AST_FORMAT_H264, "h264", "H.264 Video" },  /*!< 22: Passthrough support, see format_h263.c */
00133    { 0, 0, "nothing", "undefined" },
00134    { 0, 0, "nothing", "undefined" },
00135    { 0, 0, "nothing", "undefined" },
00136    { 0, AST_FORMAT_MAX_VIDEO, "maxvideo", "Maximum video format" },
00137 };
00138 
00139 struct ast_frame ast_null_frame = { AST_FRAME_NULL, };
00140 
00141 static int smoother_frame_feed(struct ast_smoother *s, struct ast_frame *f, int swap)
00142 {
00143    if (s->flags & AST_SMOOTHER_FLAG_G729) {
00144       if (s->len % 10) {
00145          ast_log(LOG_NOTICE, "Dropping extra frame of G.729 since we already have a VAD frame at the end\n");
00146          return 0;
00147       }
00148    }
00149    if (swap) {
00150       ast_swapcopy_samples(s->data + s->len, f->data, f->samples);
00151    } else {
00152       memcpy(s->data + s->len, f->data, f->datalen);
00153    }
00154    /* If either side is empty, reset the delivery time */
00155    if (!s->len || ast_tvzero(f->delivery) || ast_tvzero(s->delivery)) { /* XXX really ? */
00156       s->delivery = f->delivery;
00157    }
00158    s->len += f->datalen;
00159 
00160    return 0;
00161 }
00162 
00163 void ast_smoother_reset(struct ast_smoother *s, int bytes)
00164 {
00165    memset(s, 0, sizeof(*s));
00166    s->size = bytes;
00167 }
00168 
00169 void ast_smoother_reconfigure(struct ast_smoother *s, int bytes)
00170 {
00171    /* if there is no change, then nothing to do */
00172    if (s->size == bytes) {
00173       return;
00174    }
00175    /* set the new desired output size */
00176    s->size = bytes;
00177    /* if there is no 'optimized' frame in the smoother,
00178     *   then there is nothing left to do
00179     */
00180    if (!s->opt) {
00181       return;
00182    }
00183    /* there is an 'optimized' frame here at the old size,
00184     * but it must now be put into the buffer so the data
00185     * can be extracted at the new size
00186     */
00187    smoother_frame_feed(s, s->opt, s->opt_needs_swap);
00188    s->opt = NULL;
00189 }
00190 
00191 struct ast_smoother *ast_smoother_new(int size)
00192 {
00193    struct ast_smoother *s;
00194    if (size < 1)
00195       return NULL;
00196    if ((s = ast_malloc(sizeof(*s))))
00197       ast_smoother_reset(s, size);
00198    return s;
00199 }
00200 
00201 int ast_smoother_get_flags(struct ast_smoother *s)
00202 {
00203    return s->flags;
00204 }
00205 
00206 void ast_smoother_set_flags(struct ast_smoother *s, int flags)
00207 {
00208    s->flags = flags;
00209 }
00210 
00211 int ast_smoother_test_flag(struct ast_smoother *s, int flag)
00212 {
00213    return (s->flags & flag);
00214 }
00215 
00216 int __ast_smoother_feed(struct ast_smoother *s, struct ast_frame *f, int swap)
00217 {
00218    if (f->frametype != AST_FRAME_VOICE) {
00219       ast_log(LOG_WARNING, "Huh?  Can't smooth a non-voice frame!\n");
00220       return -1;
00221    }
00222    if (!s->format) {
00223       s->format = f->subclass;
00224       s->samplesperbyte = (float)f->samples / (float)f->datalen;
00225    } else if (s->format != f->subclass) {
00226       ast_log(LOG_WARNING, "Smoother was working on %d format frames, now trying to feed %d?\n", s->format, f->subclass);
00227       return -1;
00228    }
00229    if (s->len + f->datalen > SMOOTHER_SIZE) {
00230       ast_log(LOG_WARNING, "Out of smoother space\n");
00231       return -1;
00232    }
00233    if (((f->datalen == s->size) ||
00234         ((f->datalen < 10) && (s->flags & AST_SMOOTHER_FLAG_G729))) &&
00235        !s->opt &&
00236        !s->len &&
00237        (f->offset >= AST_MIN_OFFSET)) {
00238       /* Optimize by sending the frame we just got
00239          on the next read, thus eliminating the douple
00240          copy */
00241       if (swap)
00242          ast_swapcopy_samples(f->data, f->data, f->samples);
00243       s->opt = f;
00244       s->opt_needs_swap = swap ? 1 : 0;
00245       return 0;
00246    }
00247 
00248    return smoother_frame_feed(s, f, swap);
00249 }
00250 
00251 struct ast_frame *ast_smoother_read(struct ast_smoother *s)
00252 {
00253    struct ast_frame *opt;
00254    int len;
00255 
00256    /* IF we have an optimization frame, send it */
00257    if (s->opt) {
00258       if (s->opt->offset < AST_FRIENDLY_OFFSET)
00259          ast_log(LOG_WARNING, "Returning a frame of inappropriate offset (%d).\n",
00260                      s->opt->offset);
00261       opt = s->opt;
00262       s->opt = NULL;
00263       return opt;
00264    }
00265 
00266    /* Make sure we have enough data */
00267    if (s->len < s->size) {
00268       /* Or, if this is a G.729 frame with VAD on it, send it immediately anyway */
00269       if (!((s->flags & AST_SMOOTHER_FLAG_G729) && (s->size % 10)))
00270          return NULL;
00271    }
00272    len = s->size;
00273    if (len > s->len)
00274       len = s->len;
00275    /* Make frame */
00276    s->f.frametype = AST_FRAME_VOICE;
00277    s->f.subclass = s->format;
00278    s->f.data = s->framedata + AST_FRIENDLY_OFFSET;
00279    s->f.offset = AST_FRIENDLY_OFFSET;
00280    s->f.datalen = len;
00281    /* Samples will be improper given VAD, but with VAD the concept really doesn't even exist */
00282    s->f.samples = len * s->samplesperbyte;   /* XXX rounding */
00283    s->f.delivery = s->delivery;
00284    /* Fill Data */
00285    memcpy(s->f.data, s->data, len);
00286    s->len -= len;
00287    /* Move remaining data to the front if applicable */
00288    if (s->len) {
00289       /* In principle this should all be fine because if we are sending
00290          G.729 VAD, the next timestamp will take over anyawy */
00291       memmove(s->data, s->data + len, s->len);
00292       if (!ast_tvzero(s->delivery)) {
00293          /* If we have delivery time, increment it, otherwise, leave it at 0 */
00294          s->delivery = ast_tvadd(s->delivery, ast_samp2tv(s->f.samples, 8000));
00295       }
00296    }
00297    /* Return frame */
00298    return &s->f;
00299 }
00300 
00301 void ast_smoother_free(struct ast_smoother *s)
00302 {
00303    free(s);
00304 }
00305 
00306 static struct ast_frame *ast_frame_header_new(void)
00307 {
00308    struct ast_frame *f;
00309 
00310 #if !defined(LOW_MEMORY)
00311    struct ast_frame_cache *frames;
00312 
00313    if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames)))) {
00314       if ((f = AST_LIST_REMOVE_HEAD(&frames->list, frame_list))) {
00315          size_t mallocd_len = f->mallocd_hdr_len;
00316          memset(f, 0, sizeof(*f));
00317          f->mallocd_hdr_len = mallocd_len;
00318          f->mallocd = AST_MALLOCD_HDR;
00319          frames->size--;
00320          return f;
00321       }
00322    }
00323    if (!(f = ast_calloc_cache(1, sizeof(*f))))
00324       return NULL;
00325 #else
00326    if (!(f = ast_calloc(1, sizeof(*f))))
00327       return NULL;
00328 #endif
00329 
00330    f->mallocd_hdr_len = sizeof(*f);
00331 #ifdef TRACE_FRAMES
00332    AST_LIST_LOCK(&headerlist);
00333    headers++;
00334    AST_LIST_INSERT_HEAD(&headerlist, f, frame_list);
00335    AST_LIST_UNLOCK(&headerlist);
00336 #endif   
00337    
00338    return f;
00339 }
00340 
00341 #if !defined(LOW_MEMORY)
00342 static void frame_cache_cleanup(void *data)
00343 {
00344    struct ast_frame_cache *frames = data;
00345    struct ast_frame *f;
00346 
00347    while ((f = AST_LIST_REMOVE_HEAD(&frames->list, frame_list)))
00348       free(f);
00349    
00350    free(frames);
00351 }
00352 #endif
00353 
00354 void ast_frame_free(struct ast_frame *fr, int cache)
00355 {
00356    if (ast_test_flag(fr, AST_FRFLAG_FROM_TRANSLATOR)) {
00357       ast_translate_frame_freed(fr);
00358    } else if (ast_test_flag(fr, AST_FRFLAG_FROM_DSP)) {
00359       ast_dsp_frame_freed(fr);
00360    } else if (ast_test_flag(fr, AST_FRFLAG_FROM_FILESTREAM)) {
00361       ast_filestream_frame_freed(fr);
00362    }
00363 
00364    if (!fr->mallocd)
00365       return;
00366 
00367 #if !defined(LOW_MEMORY)
00368    if (cache && fr->mallocd == AST_MALLOCD_HDR) {
00369       /* Cool, only the header is malloc'd, let's just cache those for now 
00370        * to keep things simple... */
00371       struct ast_frame_cache *frames;
00372 
00373       if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames))) 
00374           && frames->size < FRAME_CACHE_MAX_SIZE) {
00375          AST_LIST_INSERT_HEAD(&frames->list, fr, frame_list);
00376          frames->size++;
00377          return;
00378       }
00379    }
00380 #endif
00381    
00382    if (fr->mallocd & AST_MALLOCD_DATA) {
00383       if (fr->data) 
00384          free(fr->data - fr->offset);
00385    }
00386    if (fr->mallocd & AST_MALLOCD_SRC) {
00387       if (fr->src)
00388          free((char *)fr->src);
00389    }
00390    if (fr->mallocd & AST_MALLOCD_HDR) {
00391 #ifdef TRACE_FRAMES
00392       AST_LIST_LOCK(&headerlist);
00393       headers--;
00394       AST_LIST_REMOVE(&headerlist, fr, frame_list);
00395       AST_LIST_UNLOCK(&headerlist);
00396 #endif         
00397       free(fr);
00398    }
00399 }
00400 
00401 /*!
00402  * \brief 'isolates' a frame by duplicating non-malloc'ed components
00403  * (header, src, data).
00404  * On return all components are malloc'ed
00405  */
00406 struct ast_frame *ast_frisolate(struct ast_frame *fr)
00407 {
00408    struct ast_frame *out;
00409    void *newdata;
00410 
00411    ast_clear_flag(fr, AST_FRFLAG_FROM_TRANSLATOR);
00412    ast_clear_flag(fr, AST_FRFLAG_FROM_DSP);
00413 
00414    if (!(fr->mallocd & AST_MALLOCD_HDR)) {
00415       /* Allocate a new header if needed */
00416       if (!(out = ast_frame_header_new()))
00417          return NULL;
00418       out->frametype = fr->frametype;
00419       out->subclass = fr->subclass;
00420       out->datalen = fr->datalen;
00421       out->samples = fr->samples;
00422       out->offset = fr->offset;
00423       out->data = fr->data;
00424       /* Copy the timing data */
00425       ast_copy_flags(out, fr, AST_FRFLAG_HAS_TIMING_INFO);
00426       if (ast_test_flag(fr, AST_FRFLAG_HAS_TIMING_INFO)) {
00427          out->ts = fr->ts;
00428          out->len = fr->len;
00429          out->seqno = fr->seqno;
00430       }
00431    } else
00432       out = fr;
00433    
00434    if (!(fr->mallocd & AST_MALLOCD_SRC)) {
00435       if (fr->src) {
00436          if (!(out->src = ast_strdup(fr->src))) {
00437             if (out != fr)
00438                free(out);
00439             return NULL;
00440          }
00441       }
00442    } else
00443       out->src = fr->src;
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          if (out != fr)
00450             free(out);
00451          return NULL;
00452       }
00453       newdata += AST_FRIENDLY_OFFSET;
00454       out->offset = AST_FRIENDLY_OFFSET;
00455       out->datalen = fr->datalen;
00456       memcpy(newdata, fr->data, fr->datalen);
00457       out->data = newdata;
00458    }
00459 
00460    out->mallocd = AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA;
00461    
00462    return out;
00463 }
00464 
00465 struct ast_frame *ast_frdup(const struct ast_frame *f)
00466 {
00467    struct ast_frame *out = NULL;
00468    int len, srclen = 0;
00469    void *buf = NULL;
00470 
00471 #if !defined(LOW_MEMORY)
00472    struct ast_frame_cache *frames;
00473 #endif
00474 
00475    /* Start with standard stuff */
00476    len = sizeof(*out) + AST_FRIENDLY_OFFSET + f->datalen;
00477    /* If we have a source, add space for it */
00478    /*
00479     * XXX Watch out here - if we receive a src which is not terminated
00480     * properly, we can be easily attacked. Should limit the size we deal with.
00481     */
00482    if (f->src)
00483       srclen = strlen(f->src);
00484    if (srclen > 0)
00485       len += srclen + 1;
00486    
00487 #if !defined(LOW_MEMORY)
00488    if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames)))) {
00489       AST_LIST_TRAVERSE_SAFE_BEGIN(&frames->list, out, frame_list) {
00490          if (out->mallocd_hdr_len >= len) {
00491             size_t mallocd_len = out->mallocd_hdr_len;
00492             AST_LIST_REMOVE_CURRENT(&frames->list, frame_list);
00493             memset(out, 0, sizeof(*out));
00494             out->mallocd_hdr_len = mallocd_len;
00495             buf = out;
00496             frames->size--;
00497             break;
00498          }
00499       }
00500       AST_LIST_TRAVERSE_SAFE_END
00501    }
00502 #endif
00503 
00504    if (!buf) {
00505       if (!(buf = ast_calloc_cache(1, len)))
00506          return NULL;
00507       out = buf;
00508       out->mallocd_hdr_len = len;
00509    }
00510 
00511    out->frametype = f->frametype;
00512    out->subclass = f->subclass;
00513    out->datalen = f->datalen;
00514    out->samples = f->samples;
00515    out->delivery = f->delivery;
00516    /* Set us as having malloc'd header only, so it will eventually
00517       get freed. */
00518    out->mallocd = AST_MALLOCD_HDR;
00519    out->offset = AST_FRIENDLY_OFFSET;
00520    if (out->datalen) {
00521       out->data = buf + sizeof(*out) + AST_FRIENDLY_OFFSET;
00522       memcpy(out->data, f->data, out->datalen); 
00523    }
00524    if (srclen > 0) {
00525       /* This may seem a little strange, but it's to avoid a gcc (4.2.4) compiler warning */
00526       char *src;
00527       out->src = buf + sizeof(*out) + AST_FRIENDLY_OFFSET + f->datalen;
00528       src = (char *) out->src;
00529       /* Must have space since we allocated for it */
00530       strcpy(src, f->src);
00531    }
00532    ast_copy_flags(out, f, AST_FRFLAG_HAS_TIMING_INFO);
00533    out->ts = f->ts;
00534    out->len = f->len;
00535    out->seqno = f->seqno;
00536    return out;
00537 }
00538 
00539 void ast_swapcopy_samples(void *dst, const void *src, int samples)
00540 {
00541    int i;
00542    unsigned short *dst_s = dst;
00543    const unsigned short *src_s = src;
00544 
00545    for (i = 0; i < samples; i++)
00546       dst_s[i] = (src_s[i]<<8) | (src_s[i]>>8);
00547 }
00548 
00549 
00550 struct ast_format_list *ast_get_format_list_index(int index) 
00551 {
00552    return &AST_FORMAT_LIST[index];
00553 }
00554 
00555 struct ast_format_list *ast_get_format_list(size_t *size) 
00556 {
00557    *size = (sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]));
00558    return AST_FORMAT_LIST;
00559 }
00560 
00561 char* ast_getformatname(int format)
00562 {
00563    int x;
00564    char *ret = "unknown";
00565    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
00566       if(AST_FORMAT_LIST[x].visible && AST_FORMAT_LIST[x].bits == format) {
00567          ret = AST_FORMAT_LIST[x].name;
00568          break;
00569       }
00570    }
00571    return ret;
00572 }
00573 
00574 char *ast_getformatname_multiple(char *buf, size_t size, int format)
00575 {
00576    int x;
00577    unsigned len;
00578    char *start, *end = buf;
00579 
00580    if (!size)
00581       return buf;
00582    snprintf(end, size, "0x%x (", format);
00583    len = strlen(end);
00584    end += len;
00585    size -= len;
00586    start = end;
00587    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
00588       if (AST_FORMAT_LIST[x].visible && (AST_FORMAT_LIST[x].bits & format)) {
00589          snprintf(end, size,"%s|",AST_FORMAT_LIST[x].name);
00590          len = strlen(end);
00591          end += len;
00592          size -= len;
00593       }
00594    }
00595    if (start == end)
00596       snprintf(start, size, "nothing)");
00597    else if (size > 1)
00598       *(end -1) = ')';
00599    return buf;
00600 }
00601 
00602 static struct ast_codec_alias_table {
00603    char *alias;
00604    char *realname;
00605 } ast_codec_alias_table[] = {
00606    { "slinear", "slin"},
00607    { "g723.1", "g723"},
00608 };
00609 
00610 static const char *ast_expand_codec_alias(const char *in)
00611 {
00612    int x;
00613 
00614    for (x = 0; x < sizeof(ast_codec_alias_table) / sizeof(ast_codec_alias_table[0]); x++) {
00615       if(!strcmp(in,ast_codec_alias_table[x].alias))
00616          return ast_codec_alias_table[x].realname;
00617    }
00618    return in;
00619 }
00620 
00621 int ast_getformatbyname(const char *name)
00622 {
00623    int x, all, format = 0;
00624 
00625    all = strcasecmp(name, "all") ? 0 : 1;
00626    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
00627       if(AST_FORMAT_LIST[x].visible && (all || 
00628            !strcasecmp(AST_FORMAT_LIST[x].name,name) ||
00629            !strcasecmp(AST_FORMAT_LIST[x].name,ast_expand_codec_alias(name)))) {
00630          format |= AST_FORMAT_LIST[x].bits;
00631          if(!all)
00632             break;
00633       }
00634    }
00635 
00636    return format;
00637 }
00638 
00639 char *ast_codec2str(int codec)
00640 {
00641    int x;
00642    char *ret = "unknown";
00643    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
00644       if(AST_FORMAT_LIST[x].visible && AST_FORMAT_LIST[x].bits == codec) {
00645          ret = AST_FORMAT_LIST[x].desc;
00646          break;
00647       }
00648    }
00649    return ret;
00650 }
00651 
00652 static int show_codecs_deprecated(int fd, int argc, char *argv[])
00653 {
00654    int i, found=0;
00655    char hex[25];
00656    
00657    if ((argc < 2) || (argc > 3))
00658       return RESULT_SHOWUSAGE;
00659 
00660    if (!ast_opt_dont_warn)
00661       ast_cli(fd, "Disclaimer: this command is for informational purposes only.\n"
00662             "\tIt does not indicate anything about your configuration.\n");
00663 
00664    ast_cli(fd, "%11s %9s %10s   TYPE   %8s   %s\n","INT","BINARY","HEX","NAME","DESC");
00665    ast_cli(fd, "--------------------------------------------------------------------------------\n");
00666    if ((argc == 2) || (!strcasecmp(argv[1],"audio"))) {
00667       found = 1;
00668       for (i=0;i<13;i++) {
00669          snprintf(hex,25,"(0x%x)",1<<i);
00670          ast_cli(fd, "%11u (1 << %2d) %10s  audio   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00671       }
00672    }
00673 
00674    if ((argc == 2) || (!strcasecmp(argv[1],"image"))) {
00675       found = 1;
00676       for (i=16;i<18;i++) {
00677          snprintf(hex,25,"(0x%x)",1<<i);
00678          ast_cli(fd, "%11u (1 << %2d) %10s  image   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00679       }
00680    }
00681 
00682    if ((argc == 2) || (!strcasecmp(argv[1],"video"))) {
00683       found = 1;
00684       for (i=18;i<22;i++) {
00685          snprintf(hex,25,"(0x%x)",1<<i);
00686          ast_cli(fd, "%11u (1 << %2d) %10s  video   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00687       }
00688    }
00689 
00690    if (! found)
00691       return RESULT_SHOWUSAGE;
00692    else
00693       return RESULT_SUCCESS;
00694 }
00695 
00696 static int show_codecs(int fd, int argc, char *argv[])
00697 {
00698    int i, found=0;
00699    char hex[25];
00700    
00701    if ((argc < 3) || (argc > 4))
00702       return RESULT_SHOWUSAGE;
00703 
00704    if (!ast_opt_dont_warn)
00705       ast_cli(fd, "Disclaimer: this command is for informational purposes only.\n"
00706             "\tIt does not indicate anything about your configuration.\n");
00707 
00708    ast_cli(fd, "%11s %9s %10s   TYPE   %8s   %s\n","INT","BINARY","HEX","NAME","DESC");
00709    ast_cli(fd, "--------------------------------------------------------------------------------\n");
00710    if ((argc == 3) || (!strcasecmp(argv[3],"audio"))) {
00711       found = 1;
00712       for (i=0;i<13;i++) {
00713          snprintf(hex,25,"(0x%x)",1<<i);
00714          ast_cli(fd, "%11u (1 << %2d) %10s  audio   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00715       }
00716    }
00717 
00718    if ((argc == 3) || (!strcasecmp(argv[3],"image"))) {
00719       found = 1;
00720       for (i=16;i<18;i++) {
00721          snprintf(hex,25,"(0x%x)",1<<i);
00722          ast_cli(fd, "%11u (1 << %2d) %10s  image   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00723       }
00724    }
00725 
00726    if ((argc == 3) || (!strcasecmp(argv[3],"video"))) {
00727       found = 1;
00728       for (i=18;i<22;i++) {
00729          snprintf(hex,25,"(0x%x)",1<<i);
00730          ast_cli(fd, "%11u (1 << %2d) %10s  video   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00731       }
00732    }
00733 
00734    if (! found)
00735       return RESULT_SHOWUSAGE;
00736    else
00737       return RESULT_SUCCESS;
00738 }
00739 
00740 static char frame_show_codecs_usage[] =
00741 "Usage: core show codecs [audio|video|image]\n"
00742 "       Displays codec mapping\n";
00743 
00744 static int show_codec_n_deprecated(int fd, int argc, char *argv[])
00745 {
00746    int codec, i, found=0;
00747 
00748    if (argc != 3)
00749       return RESULT_SHOWUSAGE;
00750 
00751    if (sscanf(argv[2],"%d",&codec) != 1)
00752       return RESULT_SHOWUSAGE;
00753 
00754    for (i = 0; i < 32; i++)
00755       if (codec & (1 << i)) {
00756          found = 1;
00757          ast_cli(fd, "%11u (1 << %2d)  %s\n",1 << i,i,ast_codec2str(1<<i));
00758       }
00759 
00760    if (!found)
00761       ast_cli(fd, "Codec %d not found\n", codec);
00762 
00763    return RESULT_SUCCESS;
00764 }
00765 
00766 static int show_codec_n(int fd, int argc, char *argv[])
00767 {
00768    int codec, i, found=0;
00769 
00770    if (argc != 4)
00771       return RESULT_SHOWUSAGE;
00772 
00773    if (sscanf(argv[3],"%d",&codec) != 1)
00774       return RESULT_SHOWUSAGE;
00775 
00776    for (i = 0; i < 32; i++)
00777       if (codec & (1 << i)) {
00778          found = 1;
00779          ast_cli(fd, "%11u (1 << %2d)  %s\n",1 << i,i,ast_codec2str(1<<i));
00780       }
00781 
00782    if (!found)
00783       ast_cli(fd, "Codec %d not found\n", codec);
00784 
00785    return RESULT_SUCCESS;
00786 }
00787 
00788 static char frame_show_codec_n_usage[] =
00789 "Usage: core show codec <number>\n"
00790 "       Displays codec mapping\n";
00791 
00792 /*! Dump a frame for debugging purposes */
00793 void ast_frame_dump(const char *name, struct ast_frame *f, char *prefix)
00794 {
00795    const char noname[] = "unknown";
00796    char ftype[40] = "Unknown Frametype";
00797    char cft[80];
00798    char subclass[40] = "Unknown Subclass";
00799    char csub[80];
00800    char moreinfo[40] = "";
00801    char cn[60];
00802    char cp[40];
00803    char cmn[40];
00804 
00805    if (!name)
00806       name = noname;
00807 
00808 
00809    if (!f) {
00810       ast_verbose("%s [ %s (NULL) ] [%s]\n", 
00811          term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00812          term_color(cft, "HANGUP", COLOR_BRRED, COLOR_BLACK, sizeof(cft)), 
00813          term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00814       return;
00815    }
00816    /* XXX We should probably print one each of voice and video when the format changes XXX */
00817    if (f->frametype == AST_FRAME_VOICE)
00818       return;
00819    if (f->frametype == AST_FRAME_VIDEO)
00820       return;
00821    switch(f->frametype) {
00822    case AST_FRAME_DTMF_BEGIN:
00823       strcpy(ftype, "DTMF Begin");
00824       subclass[0] = f->subclass;
00825       subclass[1] = '\0';
00826       break;
00827    case AST_FRAME_DTMF_END:
00828       strcpy(ftype, "DTMF End");
00829       subclass[0] = f->subclass;
00830       subclass[1] = '\0';
00831       break;
00832    case AST_FRAME_CONTROL:
00833       strcpy(ftype, "Control");
00834       switch(f->subclass) {
00835       case AST_CONTROL_HANGUP:
00836          strcpy(subclass, "Hangup");
00837          break;
00838       case AST_CONTROL_RING:
00839          strcpy(subclass, "Ring");
00840          break;
00841       case AST_CONTROL_RINGING:
00842          strcpy(subclass, "Ringing");
00843          break;
00844       case AST_CONTROL_ANSWER:
00845          strcpy(subclass, "Answer");
00846          break;
00847       case AST_CONTROL_BUSY:
00848          strcpy(subclass, "Busy");
00849          break;
00850       case AST_CONTROL_TAKEOFFHOOK:
00851          strcpy(subclass, "Take Off Hook");
00852          break;
00853       case AST_CONTROL_OFFHOOK:
00854          strcpy(subclass, "Line Off Hook");
00855          break;
00856       case AST_CONTROL_CONGESTION:
00857          strcpy(subclass, "Congestion");
00858          break;
00859       case AST_CONTROL_FLASH:
00860          strcpy(subclass, "Flash");
00861          break;
00862       case AST_CONTROL_WINK:
00863          strcpy(subclass, "Wink");
00864          break;
00865       case AST_CONTROL_OPTION:
00866          strcpy(subclass, "Option");
00867          break;
00868       case AST_CONTROL_RADIO_KEY:
00869          strcpy(subclass, "Key Radio");
00870          break;
00871       case AST_CONTROL_RADIO_UNKEY:
00872          strcpy(subclass, "Unkey Radio");
00873          break;
00874       case AST_CONTROL_PROGRESS:
00875          strcpy(subclass, "Call Progress");
00876          break;
00877       case AST_CONTROL_PROCEEDING:
00878          strcpy(subclass, "Proceeding");
00879          break;
00880       case AST_CONTROL_HOLD:
00881         strcpy(subclass, "Hold");
00882         break;
00883       case AST_CONTROL_UNHOLD:
00884         strcpy(subclass, "UnHold");
00885         break;
00886       case -1:
00887          strcpy(subclass, "Stop generators");
00888          break;
00889       default:
00890          snprintf(subclass, sizeof(subclass), "Unknown control '%d'", f->subclass);
00891       }
00892       break;
00893    case AST_FRAME_NULL:
00894       strcpy(ftype, "Null Frame");
00895       strcpy(subclass, "N/A");
00896       break;
00897    case AST_FRAME_IAX:
00898       /* Should never happen */
00899       strcpy(ftype, "IAX Specific");
00900       snprintf(subclass, sizeof(subclass), "IAX Frametype %d", f->subclass);
00901       break;
00902    case AST_FRAME_TEXT:
00903       strcpy(ftype, "Text");
00904       strcpy(subclass, "N/A");
00905       ast_copy_string(moreinfo, f->data, sizeof(moreinfo));
00906       break;
00907    case AST_FRAME_IMAGE:
00908       strcpy(ftype, "Image");
00909       snprintf(subclass, sizeof(subclass), "Image format %s\n", ast_getformatname(f->subclass));
00910       break;
00911    case AST_FRAME_HTML:
00912       strcpy(ftype, "HTML");
00913       switch(f->subclass) {
00914       case AST_HTML_URL:
00915          strcpy(subclass, "URL");
00916          ast_copy_string(moreinfo, f->data, sizeof(moreinfo));
00917          break;
00918       case AST_HTML_DATA:
00919          strcpy(subclass, "Data");
00920          break;
00921       case AST_HTML_BEGIN:
00922          strcpy(subclass, "Begin");
00923          break;
00924       case AST_HTML_END:
00925          strcpy(subclass, "End");
00926          break;
00927       case AST_HTML_LDCOMPLETE:
00928          strcpy(subclass, "Load Complete");
00929          break;
00930       case AST_HTML_NOSUPPORT:
00931          strcpy(subclass, "No Support");
00932          break;
00933       case AST_HTML_LINKURL:
00934          strcpy(subclass, "Link URL");
00935          ast_copy_string(moreinfo, f->data, sizeof(moreinfo));
00936          break;
00937       case AST_HTML_UNLINK:
00938          strcpy(subclass, "Unlink");
00939          break;
00940       case AST_HTML_LINKREJECT:
00941          strcpy(subclass, "Link Reject");
00942          break;
00943       default:
00944          snprintf(subclass, sizeof(subclass), "Unknown HTML frame '%d'\n", f->subclass);
00945          break;
00946       }
00947       break;
00948    case AST_FRAME_MODEM:
00949       strcpy(ftype, "Modem");
00950       switch (f->subclass) {
00951       case AST_MODEM_T38:
00952          strcpy(subclass, "T.38");
00953          break;
00954       case AST_MODEM_V150:
00955          strcpy(subclass, "V.150");
00956          break;
00957       default:
00958          snprintf(subclass, sizeof(subclass), "Unknown MODEM frame '%d'\n", f->subclass);
00959          break;
00960       }
00961       break;
00962    default:
00963       snprintf(ftype, sizeof(ftype), "Unknown Frametype '%d'", f->frametype);
00964    }
00965    if (!ast_strlen_zero(moreinfo))
00966       ast_verbose("%s [ TYPE: %s (%d) SUBCLASS: %s (%d) '%s' ] [%s]\n",  
00967              term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00968              term_color(cft, ftype, COLOR_BRRED, COLOR_BLACK, sizeof(cft)),
00969              f->frametype, 
00970              term_color(csub, subclass, COLOR_BRCYAN, COLOR_BLACK, sizeof(csub)),
00971              f->subclass, 
00972              term_color(cmn, moreinfo, COLOR_BRGREEN, COLOR_BLACK, sizeof(cmn)),
00973              term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00974    else
00975       ast_verbose("%s [ TYPE: %s (%d) SUBCLASS: %s (%d) ] [%s]\n",  
00976              term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00977              term_color(cft, ftype, COLOR_BRRED, COLOR_BLACK, sizeof(cft)),
00978              f->frametype, 
00979              term_color(csub, subclass, COLOR_BRCYAN, COLOR_BLACK, sizeof(csub)),
00980              f->subclass, 
00981              term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00982 }
00983 
00984 
00985 #ifdef TRACE_FRAMES
00986 static int show_frame_stats(int fd, int argc, char *argv[])
00987 {
00988    struct ast_frame *f;
00989    int x=1;
00990    if (argc != 4)
00991       return RESULT_SHOWUSAGE;
00992    AST_LIST_LOCK(&headerlist);
00993    ast_cli(fd, "     Framer Statistics     \n");
00994    ast_cli(fd, "---------------------------\n");
00995    ast_cli(fd, "Total allocated headers: %d\n", headers);
00996    ast_cli(fd, "Queue Dump:\n");
00997    AST_LIST_TRAVERSE(&headerlist, f, frame_list)
00998       ast_cli(fd, "%d.  Type %d, subclass %d from %s\n", x++, f->frametype, f->subclass, f->src ? f->src : "<Unknown>");
00999    AST_LIST_UNLOCK(&headerlist);
01000    return RESULT_SUCCESS;
01001 }
01002 
01003 static char frame_stats_usage[] =
01004 "Usage: core show frame stats\n"
01005 "       Displays debugging statistics from framer\n";
01006 #endif
01007 
01008 /* Builtin Asterisk CLI-commands for debugging */
01009 static struct ast_cli_entry cli_show_codecs = {
01010    { "show", "codecs", NULL },
01011    show_codecs_deprecated, NULL,
01012    NULL };
01013 
01014 static struct ast_cli_entry cli_show_audio_codecs = {
01015    { "show", "audio", "codecs", NULL },
01016    show_codecs_deprecated, NULL,
01017    NULL };
01018 
01019 static struct ast_cli_entry cli_show_video_codecs = {
01020    { "show", "video", "codecs", NULL },
01021    show_codecs_deprecated, NULL,
01022    NULL };
01023 
01024 static struct ast_cli_entry cli_show_image_codecs = {
01025    { "show", "image", "codecs", NULL },
01026    show_codecs_deprecated, NULL,
01027    NULL };
01028 
01029 static struct ast_cli_entry cli_show_codec = {
01030    { "show", "codec", NULL },
01031    show_codec_n_deprecated, NULL,
01032    NULL };
01033 
01034 #ifdef TRACE_FRAMES
01035 static struct ast_cli_entry cli_show_frame_stats = {
01036    { "show", "frame", "stats", NULL },
01037    show_frame_stats, NULL,
01038    NULL };
01039 #endif
01040 
01041 static struct ast_cli_entry my_clis[] = {
01042    { { "core", "show", "codecs", NULL },
01043    show_codecs, "Displays a list of codecs",
01044    frame_show_codecs_usage, NULL, &cli_show_codecs },
01045 
01046    { { "core", "show", "audio", "codecs", NULL },
01047    show_codecs, "Displays a list of audio codecs",
01048    frame_show_codecs_usage, NULL, &cli_show_audio_codecs },
01049 
01050    { { "core", "show", "video", "codecs", NULL },
01051    show_codecs, "Displays a list of video codecs",
01052    frame_show_codecs_usage, NULL, &cli_show_video_codecs },
01053 
01054    { { "core", "show", "image", "codecs", NULL },
01055    show_codecs, "Displays a list of image codecs",
01056    frame_show_codecs_usage, NULL, &cli_show_image_codecs },
01057 
01058    { { "core", "show", "codec", NULL },
01059    show_codec_n, "Shows a specific codec",
01060    frame_show_codec_n_usage, NULL, &cli_show_codec },
01061 
01062 #ifdef TRACE_FRAMES
01063    { { "core", "show", "frame", "stats", NULL },
01064    show_frame_stats, "Shows frame statistics",
01065    frame_stats_usage, NULL, &cli_show_frame_stats },
01066 #endif
01067 };
01068 
01069 int init_framer(void)
01070 {
01071    ast_cli_register_multiple(my_clis, sizeof(my_clis) / sizeof(struct ast_cli_entry));
01072    return 0;   
01073 }
01074 
01075 void ast_codec_pref_convert(struct ast_codec_pref *pref, char *buf, size_t size, int right) 
01076 {
01077    int x, differential = (int) 'A', mem;
01078    char *from, *to;
01079 
01080    if(right) {
01081       from = pref->order;
01082       to = buf;
01083       mem = size;
01084    } else {
01085       to = pref->order;
01086       from = buf;
01087       mem = 32;
01088    }
01089 
01090    memset(to, 0, mem);
01091    for (x = 0; x < 32 ; x++) {
01092       if(!from[x])
01093          break;
01094       to[x] = right ? (from[x] + differential) : (from[x] - differential);
01095    }
01096 }
01097 
01098 int ast_codec_pref_string(struct ast_codec_pref *pref, char *buf, size_t size) 
01099 {
01100    int x, codec; 
01101    size_t total_len, slen;
01102    char *formatname;
01103    
01104    memset(buf,0,size);
01105    total_len = size;
01106    buf[0] = '(';
01107    total_len--;
01108    for(x = 0; x < 32 ; x++) {
01109       if(total_len <= 0)
01110          break;
01111       if(!(codec = ast_codec_pref_index(pref,x)))
01112          break;
01113       if((formatname = ast_getformatname(codec))) {
01114          slen = strlen(formatname);
01115          if(slen > total_len)
01116             break;
01117          strncat(buf, formatname, total_len - 1); /* safe */
01118          total_len -= slen;
01119       }
01120       if(total_len && x < 31 && ast_codec_pref_index(pref , x + 1)) {
01121          strncat(buf, "|", total_len - 1); /* safe */
01122          total_len--;
01123       }
01124    }
01125    if(total_len) {
01126       strncat(buf, ")", total_len - 1); /* safe */
01127       total_len--;
01128    }
01129 
01130    return size - total_len;
01131 }
01132 
01133 int ast_codec_pref_index(struct ast_codec_pref *pref, int index) 
01134 {
01135    int slot = 0;
01136 
01137    
01138    if((index >= 0) && (index < sizeof(pref->order))) {
01139       slot = pref->order[index];
01140    }
01141 
01142    return slot ? AST_FORMAT_LIST[slot-1].bits : 0;
01143 }
01144 
01145 /*! \brief Remove codec from pref list */
01146 void ast_codec_pref_remove(struct ast_codec_pref *pref, int format)
01147 {
01148    struct ast_codec_pref oldorder;
01149    int x, y = 0;
01150    int slot;
01151    int size;
01152 
01153    if(!pref->order[0])
01154       return;
01155 
01156    memcpy(&oldorder, pref, sizeof(oldorder));
01157    memset(pref, 0, sizeof(*pref));
01158 
01159    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01160       slot = oldorder.order[x];
01161       size = oldorder.framing[x];
01162       if(! slot)
01163          break;
01164       if(AST_FORMAT_LIST[slot-1].bits != format) {
01165          pref->order[y] = slot;
01166          pref->framing[y++] = size;
01167       }
01168    }
01169    
01170 }
01171 
01172 /*! \brief Append codec to list */
01173 int ast_codec_pref_append(struct ast_codec_pref *pref, int format)
01174 {
01175    int x, newindex = 0;
01176 
01177    ast_codec_pref_remove(pref, format);
01178 
01179    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01180       if(AST_FORMAT_LIST[x].bits == format) {
01181          newindex = x + 1;
01182          break;
01183       }
01184    }
01185 
01186    if(newindex) {
01187       for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01188          if(!pref->order[x]) {
01189             pref->order[x] = newindex;
01190             break;
01191          }
01192       }
01193    }
01194 
01195    return x;
01196 }
01197 
01198 /*! \brief Prepend codec to list */
01199 void ast_codec_pref_prepend(struct ast_codec_pref *pref, int format, int only_if_existing)
01200 {
01201    int x, newindex = 0;
01202 
01203    /* First step is to get the codecs "index number" */
01204    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01205       if (AST_FORMAT_LIST[x].bits == format) {
01206          newindex = x + 1;
01207          break;
01208       }
01209    }
01210    /* Done if its unknown */
01211    if (!newindex)
01212       return;
01213 
01214    /* Now find any existing occurrence, or the end */
01215    for (x = 0; x < 32; x++) {
01216       if (!pref->order[x] || pref->order[x] == newindex)
01217          break;
01218    }
01219 
01220    if (only_if_existing && !pref->order[x])
01221       return;
01222 
01223    /* Move down to make space to insert - either all the way to the end,
01224       or as far as the existing location (which will be overwritten) */
01225    for (; x > 0; x--) {
01226       pref->order[x] = pref->order[x - 1];
01227       pref->framing[x] = pref->framing[x - 1];
01228    }
01229 
01230    /* And insert the new entry */
01231    pref->order[0] = newindex;
01232    pref->framing[0] = 0; /* ? */
01233 }
01234 
01235 /*! \brief Set packet size for codec */
01236 int ast_codec_pref_setsize(struct ast_codec_pref *pref, int format, int framems)
01237 {
01238    int x, index = -1;
01239 
01240    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01241       if(AST_FORMAT_LIST[x].bits == format) {
01242          index = x;
01243          break;
01244       }
01245    }
01246 
01247    if(index < 0)
01248       return -1;
01249 
01250    /* size validation */
01251    if(!framems)
01252       framems = AST_FORMAT_LIST[index].def_ms;
01253 
01254    if(AST_FORMAT_LIST[index].inc_ms && framems % AST_FORMAT_LIST[index].inc_ms) /* avoid division by zero */
01255       framems -= framems % AST_FORMAT_LIST[index].inc_ms;
01256 
01257    if(framems < AST_FORMAT_LIST[index].min_ms)
01258       framems = AST_FORMAT_LIST[index].min_ms;
01259 
01260    if(framems > AST_FORMAT_LIST[index].max_ms)
01261       framems = AST_FORMAT_LIST[index].max_ms;
01262 
01263 
01264    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01265       if(pref->order[x] == (index + 1)) {
01266          pref->framing[x] = framems;
01267          break;
01268       }
01269    }
01270 
01271    return x;
01272 }
01273 
01274 /*! \brief Get packet size for codec */
01275 struct ast_format_list ast_codec_pref_getsize(struct ast_codec_pref *pref, int format)
01276 {
01277    int x, index = -1, framems = 0;
01278    struct ast_format_list fmt = {0};
01279 
01280    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01281       if(AST_FORMAT_LIST[x].bits == format) {
01282          fmt = AST_FORMAT_LIST[x];
01283          index = x;
01284          break;
01285       }
01286    }
01287 
01288    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01289       if(pref->order[x] == (index + 1)) {
01290          framems = pref->framing[x];
01291          break;
01292       }
01293    }
01294 
01295    /* size validation */
01296    if(!framems)
01297       framems = AST_FORMAT_LIST[index].def_ms;
01298 
01299    if(AST_FORMAT_LIST[index].inc_ms && framems % AST_FORMAT_LIST[index].inc_ms) /* avoid division by zero */
01300       framems -= framems % AST_FORMAT_LIST[index].inc_ms;
01301 
01302    if(framems < AST_FORMAT_LIST[index].min_ms)
01303       framems = AST_FORMAT_LIST[index].min_ms;
01304 
01305    if(framems > AST_FORMAT_LIST[index].max_ms)
01306       framems = AST_FORMAT_LIST[index].max_ms;
01307 
01308    fmt.cur_ms = framems;
01309 
01310    return fmt;
01311 }
01312 
01313 /*! \brief Pick a codec */
01314 int ast_codec_choose(struct ast_codec_pref *pref, int formats, int find_best)
01315 {
01316    int x, ret = 0, slot;
01317 
01318    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01319       slot = pref->order[x];
01320 
01321       if (!slot)
01322          break;
01323       if (formats & AST_FORMAT_LIST[slot-1].bits) {
01324          ret = AST_FORMAT_LIST[slot-1].bits;
01325          break;
01326       }
01327    }
01328    if(ret & AST_FORMAT_AUDIO_MASK)
01329       return ret;
01330 
01331    if (option_debug > 3)
01332       ast_log(LOG_DEBUG, "Could not find preferred codec - %s\n", find_best ? "Going for the best codec" : "Returning zero codec");
01333 
01334       return find_best ? ast_best_codec(formats) : 0;
01335 }
01336 
01337 void ast_parse_allow_disallow(struct ast_codec_pref *pref, int *mask, const char *list, int allowing) 
01338 {
01339    char *parse = NULL, *this = NULL, *psize = NULL;
01340    int format = 0, framems = 0;
01341 
01342    parse = ast_strdupa(list);
01343    while ((this = strsep(&parse, ","))) {
01344       framems = 0;
01345       if ((psize = strrchr(this, ':'))) {
01346          *psize++ = '\0';
01347          if (option_debug)
01348             ast_log(LOG_DEBUG,"Packetization for codec: %s is %s\n", this, psize);
01349          framems = atoi(psize);
01350          if (framems < 0)
01351             framems = 0;
01352       }
01353       if (!(format = ast_getformatbyname(this))) {
01354          ast_log(LOG_WARNING, "Cannot %s unknown format '%s'\n", allowing ? "allow" : "disallow", this);
01355          continue;
01356       }
01357 
01358       if (mask) {
01359          if (allowing)
01360             *mask |= format;
01361          else
01362             *mask &= ~format;
01363       }
01364 
01365       /* Set up a preference list for audio. Do not include video in preferences 
01366          since we can not transcode video and have to use whatever is offered
01367        */
01368       if (pref && (format & AST_FORMAT_AUDIO_MASK)) {
01369          if (strcasecmp(this, "all")) {
01370             if (allowing) {
01371                ast_codec_pref_append(pref, format);
01372                ast_codec_pref_setsize(pref, format, framems);
01373             }
01374             else
01375                ast_codec_pref_remove(pref, format);
01376          } else if (!allowing) {
01377             memset(pref, 0, sizeof(*pref));
01378          }
01379       }
01380    }
01381 }
01382 
01383 static int g723_len(unsigned char buf)
01384 {
01385    enum frame_type type = buf & TYPE_MASK;
01386 
01387    switch(type) {
01388    case TYPE_DONTSEND:
01389       return 0;
01390       break;
01391    case TYPE_SILENCE:
01392       return 4;
01393       break;
01394    case TYPE_HIGH:
01395       return 24;
01396       break;
01397    case TYPE_LOW:
01398       return 20;
01399       break;
01400    default:
01401       ast_log(LOG_WARNING, "Badly encoded frame (%d)\n", type);
01402    }
01403    return -1;
01404 }
01405 
01406 static int g723_samples(unsigned char *buf, int maxlen)
01407 {
01408    int pos = 0;
01409    int samples = 0;
01410    int res;
01411    while(pos < maxlen) {
01412       res = g723_len(buf[pos]);
01413       if (res <= 0)
01414          break;
01415       samples += 240;
01416       pos += res;
01417    }
01418    return samples;
01419 }
01420 
01421 static unsigned char get_n_bits_at(unsigned char *data, int n, int bit)
01422 {
01423    int byte = bit / 8;       /* byte containing first bit */
01424    int rem = 8 - (bit % 8);  /* remaining bits in first byte */
01425    unsigned char ret = 0;
01426    
01427    if (n <= 0 || n > 8)
01428       return 0;
01429 
01430    if (rem < n) {
01431       ret = (data[byte] << (n - rem));
01432       ret |= (data[byte + 1] >> (8 - n + rem));
01433    } else {
01434       ret = (data[byte] >> (rem - n));
01435    }
01436 
01437    return (ret & (0xff >> (8 - n)));
01438 }
01439 
01440 static int speex_get_wb_sz_at(unsigned char *data, int len, int bit)
01441 {
01442    static int SpeexWBSubModeSz[] = {
01443       0, 36, 112, 192,
01444       352, 0, 0, 0 };
01445    int off = bit;
01446    unsigned char c;
01447 
01448    /* skip up to two wideband frames */
01449    if (((len * 8 - off) >= 5) && 
01450       get_n_bits_at(data, 1, off)) {
01451       c = get_n_bits_at(data, 3, off + 1);
01452       off += SpeexWBSubModeSz[c];
01453 
01454       if (((len * 8 - off) >= 5) && 
01455          get_n_bits_at(data, 1, off)) {
01456          c = get_n_bits_at(data, 3, off + 1);
01457          off += SpeexWBSubModeSz[c];
01458 
01459          if (((len * 8 - off) >= 5) && 
01460             get_n_bits_at(data, 1, off)) {
01461             ast_log(LOG_WARNING, "Encountered corrupt speex frame; too many wideband frames in a row.\n");
01462             return -1;
01463          }
01464       }
01465 
01466    }
01467    return off - bit;
01468 }
01469 
01470 static int speex_samples(unsigned char *data, int len)
01471 {
01472    static int SpeexSubModeSz[] = {
01473                5, 43, 119, 160,
01474       220, 300, 364, 492, 
01475       79, 0, 0, 0,
01476       0, 0, 0, 0 };
01477    static int SpeexInBandSz[] = { 
01478       1, 1, 4, 4,
01479       4, 4, 4, 4,
01480       8, 8, 16, 16,
01481       32, 32, 64, 64 };
01482    int bit = 0;
01483    int cnt = 0;
01484    int off;
01485    unsigned char c;
01486 
01487    while ((len * 8 - bit) >= 5) {
01488       /* skip wideband frames */
01489       off = speex_get_wb_sz_at(data, len, bit);
01490       if (off < 0)  {
01491          ast_log(LOG_WARNING, "Had error while reading wideband frames for speex samples\n");
01492          break;
01493       }
01494       bit += off;
01495 
01496       if ((len * 8 - bit) < 5) {
01497          ast_log(LOG_WARNING, "Not enough bits remaining after wide band for speex samples.\n");
01498          break;
01499       }
01500 
01501       /* get control bits */
01502       c = get_n_bits_at(data, 5, bit);
01503       bit += 5;
01504 
01505       if (c == 15) { 
01506          /* terminator */
01507          break; 
01508       } else if (c == 14) {
01509          /* in-band signal; next 4 bits contain signal id */
01510          c = get_n_bits_at(data, 4, bit);
01511          bit += 4;
01512          bit += SpeexInBandSz[c];
01513       } else if (c == 13) {
01514          /* user in-band; next 5 bits contain msg len */
01515          c = get_n_bits_at(data, 5, bit);
01516          bit += 5;
01517          bit += c * 8;
01518       } else if (c > 8) {
01519          /* unknown */
01520          break;
01521       } else {
01522          /* skip number bits for submode (less the 5 control bits) */
01523          bit += SpeexSubModeSz[c] - 5;
01524          cnt += 160; /* new frame */
01525       }
01526    }
01527    return cnt;
01528 }
01529 
01530 int ast_codec_get_samples(struct ast_frame *f)
01531 {
01532    int samples=0;
01533    switch(f->subclass) {
01534    case AST_FORMAT_SPEEX:
01535       samples = speex_samples(f->data, f->datalen);
01536       break;
01537    case AST_FORMAT_G723_1:
01538                 samples = g723_samples(f->data, f->datalen);
01539       break;
01540    case AST_FORMAT_ILBC:
01541       samples = 240 * (f->datalen / 50);
01542       break;
01543    case AST_FORMAT_GSM:
01544       samples = 160 * (f->datalen / 33);
01545       break;
01546    case AST_FORMAT_G729A:
01547       samples = f->datalen * 8;
01548       break;
01549    case AST_FORMAT_SLINEAR:
01550       samples = f->datalen / 2;
01551       break;
01552    case AST_FORMAT_LPC10:
01553                 /* assumes that the RTP packet contains one LPC10 frame */
01554       samples = 22 * 8;
01555       samples += (((char *)(f->data))[7] & 0x1) * 8;
01556       break;
01557    case AST_FORMAT_ULAW:
01558    case AST_FORMAT_ALAW:
01559       samples = f->datalen;
01560       break;
01561    case AST_FORMAT_G722:
01562    case AST_FORMAT_ADPCM:
01563    case AST_FORMAT_G726:
01564    case AST_FORMAT_G726_AAL2:
01565       samples = f->datalen * 2;
01566       break;
01567    default:
01568       ast_log(LOG_WARNING, "Unable to calculate samples for format %s\n", ast_getformatname(f->subclass));
01569    }
01570    return samples;
01571 }
01572 
01573 int ast_codec_get_len(int format, int samples)
01574 {
01575    int len = 0;
01576 
01577    /* XXX Still need speex, g723, and lpc10 XXX */ 
01578    switch(format) {
01579    case AST_FORMAT_ILBC:
01580       len = (samples / 240) * 50;
01581       break;
01582    case AST_FORMAT_GSM:
01583       len = (samples / 160) * 33;
01584       break;
01585    case AST_FORMAT_G729A:
01586       len = samples / 8;
01587       break;
01588    case AST_FORMAT_SLINEAR:
01589       len = samples * 2;
01590       break;
01591    case AST_FORMAT_ULAW:
01592    case AST_FORMAT_ALAW:
01593       len = samples;
01594       break;
01595    case AST_FORMAT_G722:
01596    case AST_FORMAT_ADPCM:
01597    case AST_FORMAT_G726:
01598    case AST_FORMAT_G726_AAL2:
01599       len = samples / 2;
01600       break;
01601    default:
01602       ast_log(LOG_WARNING, "Unable to calculate sample length for format %s\n", ast_getformatname(format));
01603    }
01604 
01605    return len;
01606 }
01607 
01608 int ast_frame_adjust_volume(struct ast_frame *f, int adjustment)
01609 {
01610    int count;
01611    short *fdata = f->data;
01612    short adjust_value = abs(adjustment);
01613 
01614    if ((f->frametype != AST_FRAME_VOICE) || (f->subclass != AST_FORMAT_SLINEAR))
01615       return -1;
01616 
01617    if (!adjustment)
01618       return 0;
01619 
01620    for (count = 0; count < f->samples; count++) {
01621       if (adjustment > 0) {
01622          ast_slinear_saturated_multiply(&fdata[count], &adjust_value);
01623       } else if (adjustment < 0) {
01624          ast_slinear_saturated_divide(&fdata[count], &adjust_value);
01625       }
01626    }
01627 
01628    return 0;
01629 }
01630 
01631 int ast_frame_slinear_sum(struct ast_frame *f1, struct ast_frame *f2)
01632 {
01633    int count;
01634    short *data1, *data2;
01635 
01636    if ((f1->frametype != AST_FRAME_VOICE) || (f1->subclass != AST_FORMAT_SLINEAR))
01637       return -1;
01638 
01639    if ((f2->frametype != AST_FRAME_VOICE) || (f2->subclass != AST_FORMAT_SLINEAR))
01640       return -1;
01641 
01642    if (f1->samples != f2->samples)
01643       return -1;
01644 
01645    for (count = 0, data1 = f1->data, data2 = f2->data;
01646         count < f1->samples;
01647         count++, data1++, data2++)
01648       ast_slinear_saturated_add(data1, data2);
01649 
01650    return 0;
01651 }

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