Wed Feb 11 11:59:54 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: 160207 $")
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 readdata;
00097    int optimizablestream;
00098    int flags;
00099    float samplesperbyte;
00100    struct ast_frame f;
00101    struct timeval delivery;
00102    char data[SMOOTHER_SIZE];
00103    char framedata[SMOOTHER_SIZE + AST_FRIENDLY_OFFSET];
00104    struct ast_frame *opt;
00105    int len;
00106 };
00107 
00108 /*! \brief Definition of supported media formats (codecs) */
00109 static struct ast_format_list AST_FORMAT_LIST[] = {               /*!< Bit number: comment  - Bit numbers are hard coded in show_codec() */
00110    { 1, AST_FORMAT_G723_1 , "g723" , "G.723.1", 24, 30, 300, 30, 30 },  /*!<  1 */
00111    { 1, AST_FORMAT_GSM, "gsm" , "GSM", 33, 20, 300, 20, 20 },     /*!<  2: codec_gsm.c */
00112    { 1, AST_FORMAT_ULAW, "ulaw", "G.711 u-law", 80, 10, 150, 10, 20 },  /*!<  3: codec_ulaw.c */
00113    { 1, AST_FORMAT_ALAW, "alaw", "G.711 A-law", 80, 10, 150, 10, 20 },  /*!<  4: codec_alaw.c */
00114    { 1, AST_FORMAT_G726, "g726", "G.726 RFC3551", 40, 10, 300, 10, 20 },   /*!<  5: codec_g726.c */
00115    { 1, AST_FORMAT_ADPCM, "adpcm" , "ADPCM", 40, 10, 300, 10, 20 },  /*!<  6: codec_adpcm.c */
00116    { 1, AST_FORMAT_SLINEAR, "slin", "16 bit Signed Linear PCM", 160, 10, 70, 10, 20, AST_SMOOTHER_FLAG_BE },   /*!< 7 */
00117    { 1, AST_FORMAT_LPC10, "lpc10", "LPC10", 7, 20, 20, 20, 20 },     /*!<  8: codec_lpc10.c */ 
00118    { 1, AST_FORMAT_G729A, "g729", "G.729A", 10, 10, 230, 10, 40, AST_SMOOTHER_FLAG_G729 },   /*!<  9: Binary commercial distribution */
00119    { 1, AST_FORMAT_SPEEX, "speex", "SpeeX", 10, 10, 60, 10, 20 },    /*!< 10: codec_speex.c */
00120    { 1, AST_FORMAT_ILBC, "ilbc", "iLBC", 50, 30, 30, 30, 30 },    /*!< 11: codec_ilbc.c */ /* inc=30ms - workaround */
00121    { 1, AST_FORMAT_G726_AAL2, "g726aal2", "G.726 AAL2", 40, 10, 300, 10, 20 },   /*!<  12: codec_g726.c */
00122    { 1, AST_FORMAT_G722, "g722", "G.722", 80, 10, 150, 10, 20 },  /*!<  13: codec_g722.c */
00123    { 0, 0, "nothing", "undefined" },
00124    { 0, 0, "nothing", "undefined" },
00125    { 0, 0, "nothing", "undefined" },
00126    { 0, 0, "nothing", "undefined" },
00127    { 0, AST_FORMAT_MAX_AUDIO, "maxaudio", "Maximum audio format" },  
00128    { 1, AST_FORMAT_JPEG, "jpeg", "JPEG image"}, /*!< 17: See format_jpeg.c */
00129    { 1, AST_FORMAT_PNG, "png", "PNG image"}, /*!< 18: Image format */
00130    { 1, AST_FORMAT_H261, "h261", "H.261 Video" },  /*!< 19: Video Passthrough */
00131    { 1, AST_FORMAT_H263, "h263", "H.263 Video" },  /*!< 20: Passthrough support, see format_h263.c */
00132    { 1, AST_FORMAT_H263_PLUS, "h263p", "H.263+ Video" }, /*!< 21: See format_h263.c */
00133    { 1, AST_FORMAT_H264, "h264", "H.264 Video" },  /*!< 22: Passthrough support, see format_h263.c */
00134    { 0, 0, "nothing", "undefined" },
00135    { 0, 0, "nothing", "undefined" },
00136    { 0, 0, "nothing", "undefined" },
00137    { 0, AST_FORMAT_MAX_VIDEO, "maxvideo", "Maximum video format" },
00138 };
00139 
00140 struct ast_frame ast_null_frame = { AST_FRAME_NULL, };
00141 
00142 void ast_smoother_reset(struct ast_smoother *s, int size)
00143 {
00144    memset(s, 0, sizeof(*s));
00145    s->size = size;
00146 }
00147 
00148 struct ast_smoother *ast_smoother_new(int size)
00149 {
00150    struct ast_smoother *s;
00151    if (size < 1)
00152       return NULL;
00153    if ((s = ast_malloc(sizeof(*s))))
00154       ast_smoother_reset(s, size);
00155    return s;
00156 }
00157 
00158 int ast_smoother_get_flags(struct ast_smoother *s)
00159 {
00160    return s->flags;
00161 }
00162 
00163 void ast_smoother_set_flags(struct ast_smoother *s, int flags)
00164 {
00165    s->flags = flags;
00166 }
00167 
00168 int ast_smoother_test_flag(struct ast_smoother *s, int flag)
00169 {
00170    return (s->flags & flag);
00171 }
00172 
00173 int __ast_smoother_feed(struct ast_smoother *s, struct ast_frame *f, int swap)
00174 {
00175    if (f->frametype != AST_FRAME_VOICE) {
00176       ast_log(LOG_WARNING, "Huh?  Can't smooth a non-voice frame!\n");
00177       return -1;
00178    }
00179    if (!s->format) {
00180       s->format = f->subclass;
00181       s->samplesperbyte = (float)f->samples / (float)f->datalen;
00182    } else if (s->format != f->subclass) {
00183       ast_log(LOG_WARNING, "Smoother was working on %d format frames, now trying to feed %d?\n", s->format, f->subclass);
00184       return -1;
00185    }
00186    if (s->len + f->datalen > SMOOTHER_SIZE) {
00187       ast_log(LOG_WARNING, "Out of smoother space\n");
00188       return -1;
00189    }
00190    if (((f->datalen == s->size) || ((f->datalen < 10) && (s->flags & AST_SMOOTHER_FLAG_G729)))
00191              && !s->opt && (f->offset >= AST_MIN_OFFSET)) {
00192       if (!s->len) {
00193          /* Optimize by sending the frame we just got
00194             on the next read, thus eliminating the douple
00195             copy */
00196          if (swap)
00197             ast_swapcopy_samples(f->data, f->data, f->samples);
00198          s->opt = f;
00199          return 0;
00200       }
00201    }
00202    if (s->flags & AST_SMOOTHER_FLAG_G729) {
00203       if (s->len % 10) {
00204          ast_log(LOG_NOTICE, "Dropping extra frame of G.729 since we already have a VAD frame at the end\n");
00205          return 0;
00206       }
00207    }
00208    if (swap)
00209       ast_swapcopy_samples(s->data+s->len, f->data, f->samples);
00210    else
00211       memcpy(s->data + s->len, f->data, f->datalen);
00212    /* If either side is empty, reset the delivery time */
00213    if (!s->len || ast_tvzero(f->delivery) || ast_tvzero(s->delivery))   /* XXX really ? */
00214       s->delivery = f->delivery;
00215    s->len += f->datalen;
00216    return 0;
00217 }
00218 
00219 struct ast_frame *ast_smoother_read(struct ast_smoother *s)
00220 {
00221    struct ast_frame *opt;
00222    int len;
00223 
00224    /* IF we have an optimization frame, send it */
00225    if (s->opt) {
00226       if (s->opt->offset < AST_FRIENDLY_OFFSET)
00227          ast_log(LOG_WARNING, "Returning a frame of inappropriate offset (%d).\n",
00228                      s->opt->offset);
00229       opt = s->opt;
00230       s->opt = NULL;
00231       return opt;
00232    }
00233 
00234    /* Make sure we have enough data */
00235    if (s->len < s->size) {
00236       /* Or, if this is a G.729 frame with VAD on it, send it immediately anyway */
00237       if (!((s->flags & AST_SMOOTHER_FLAG_G729) && (s->size % 10)))
00238          return NULL;
00239    }
00240    len = s->size;
00241    if (len > s->len)
00242       len = s->len;
00243    /* Make frame */
00244    s->f.frametype = AST_FRAME_VOICE;
00245    s->f.subclass = s->format;
00246    s->f.data = s->framedata + AST_FRIENDLY_OFFSET;
00247    s->f.offset = AST_FRIENDLY_OFFSET;
00248    s->f.datalen = len;
00249    /* Samples will be improper given VAD, but with VAD the concept really doesn't even exist */
00250    s->f.samples = len * s->samplesperbyte;   /* XXX rounding */
00251    s->f.delivery = s->delivery;
00252    /* Fill Data */
00253    memcpy(s->f.data, s->data, len);
00254    s->len -= len;
00255    /* Move remaining data to the front if applicable */
00256    if (s->len) {
00257       /* In principle this should all be fine because if we are sending
00258          G.729 VAD, the next timestamp will take over anyawy */
00259       memmove(s->data, s->data + len, s->len);
00260       if (!ast_tvzero(s->delivery)) {
00261          /* If we have delivery time, increment it, otherwise, leave it at 0 */
00262          s->delivery = ast_tvadd(s->delivery, ast_samp2tv(s->f.samples, 8000));
00263       }
00264    }
00265    /* Return frame */
00266    return &s->f;
00267 }
00268 
00269 void ast_smoother_free(struct ast_smoother *s)
00270 {
00271    free(s);
00272 }
00273 
00274 static struct ast_frame *ast_frame_header_new(void)
00275 {
00276    struct ast_frame *f;
00277 
00278 #if !defined(LOW_MEMORY)
00279    struct ast_frame_cache *frames;
00280 
00281    if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames)))) {
00282       if ((f = AST_LIST_REMOVE_HEAD(&frames->list, frame_list))) {
00283          size_t mallocd_len = f->mallocd_hdr_len;
00284          memset(f, 0, sizeof(*f));
00285          f->mallocd_hdr_len = mallocd_len;
00286          f->mallocd = AST_MALLOCD_HDR;
00287          frames->size--;
00288          return f;
00289       }
00290    }
00291    if (!(f = ast_calloc_cache(1, sizeof(*f))))
00292       return NULL;
00293 #else
00294    if (!(f = ast_calloc(1, sizeof(*f))))
00295       return NULL;
00296 #endif
00297 
00298    f->mallocd_hdr_len = sizeof(*f);
00299 #ifdef TRACE_FRAMES
00300    AST_LIST_LOCK(&headerlist);
00301    headers++;
00302    AST_LIST_INSERT_HEAD(&headerlist, f, frame_list);
00303    AST_LIST_UNLOCK(&headerlist);
00304 #endif   
00305    
00306    return f;
00307 }
00308 
00309 #if !defined(LOW_MEMORY)
00310 static void frame_cache_cleanup(void *data)
00311 {
00312    struct ast_frame_cache *frames = data;
00313    struct ast_frame *f;
00314 
00315    while ((f = AST_LIST_REMOVE_HEAD(&frames->list, frame_list)))
00316       free(f);
00317    
00318    free(frames);
00319 }
00320 #endif
00321 
00322 void ast_frame_free(struct ast_frame *fr, int cache)
00323 {
00324    if (ast_test_flag(fr, AST_FRFLAG_FROM_TRANSLATOR)) {
00325       ast_translate_frame_freed(fr);
00326    } else if (ast_test_flag(fr, AST_FRFLAG_FROM_DSP)) {
00327       ast_dsp_frame_freed(fr);
00328    } else if (ast_test_flag(fr, AST_FRFLAG_FROM_FILESTREAM)) {
00329       ast_filestream_frame_freed(fr);
00330    }
00331 
00332    if (!fr->mallocd)
00333       return;
00334 
00335 #if !defined(LOW_MEMORY)
00336    if (cache && fr->mallocd == AST_MALLOCD_HDR) {
00337       /* Cool, only the header is malloc'd, let's just cache those for now 
00338        * to keep things simple... */
00339       struct ast_frame_cache *frames;
00340 
00341       if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames))) 
00342           && frames->size < FRAME_CACHE_MAX_SIZE) {
00343          AST_LIST_INSERT_HEAD(&frames->list, fr, frame_list);
00344          frames->size++;
00345          return;
00346       }
00347    }
00348 #endif
00349    
00350    if (fr->mallocd & AST_MALLOCD_DATA) {
00351       if (fr->data) 
00352          free(fr->data - fr->offset);
00353    }
00354    if (fr->mallocd & AST_MALLOCD_SRC) {
00355       if (fr->src)
00356          free((char *)fr->src);
00357    }
00358    if (fr->mallocd & AST_MALLOCD_HDR) {
00359 #ifdef TRACE_FRAMES
00360       AST_LIST_LOCK(&headerlist);
00361       headers--;
00362       AST_LIST_REMOVE(&headerlist, fr, frame_list);
00363       AST_LIST_UNLOCK(&headerlist);
00364 #endif         
00365       free(fr);
00366    }
00367 }
00368 
00369 /*!
00370  * \brief 'isolates' a frame by duplicating non-malloc'ed components
00371  * (header, src, data).
00372  * On return all components are malloc'ed
00373  */
00374 struct ast_frame *ast_frisolate(struct ast_frame *fr)
00375 {
00376    struct ast_frame *out;
00377    void *newdata;
00378 
00379    ast_clear_flag(fr, AST_FRFLAG_FROM_TRANSLATOR);
00380    ast_clear_flag(fr, AST_FRFLAG_FROM_DSP);
00381 
00382    if (!(fr->mallocd & AST_MALLOCD_HDR)) {
00383       /* Allocate a new header if needed */
00384       if (!(out = ast_frame_header_new()))
00385          return NULL;
00386       out->frametype = fr->frametype;
00387       out->subclass = fr->subclass;
00388       out->datalen = fr->datalen;
00389       out->samples = fr->samples;
00390       out->offset = fr->offset;
00391       out->data = fr->data;
00392       /* Copy the timing data */
00393       ast_copy_flags(out, fr, AST_FRFLAG_HAS_TIMING_INFO);
00394       if (ast_test_flag(fr, AST_FRFLAG_HAS_TIMING_INFO)) {
00395          out->ts = fr->ts;
00396          out->len = fr->len;
00397          out->seqno = fr->seqno;
00398       }
00399    } else
00400       out = fr;
00401    
00402    if (!(fr->mallocd & AST_MALLOCD_SRC)) {
00403       if (fr->src) {
00404          if (!(out->src = ast_strdup(fr->src))) {
00405             if (out != fr)
00406                free(out);
00407             return NULL;
00408          }
00409       }
00410    } else
00411       out->src = fr->src;
00412    
00413    if (!(fr->mallocd & AST_MALLOCD_DATA))  {
00414       if (!(newdata = ast_malloc(fr->datalen + AST_FRIENDLY_OFFSET))) {
00415          if (out->src != fr->src)
00416             free((void *) out->src);
00417          if (out != fr)
00418             free(out);
00419          return NULL;
00420       }
00421       newdata += AST_FRIENDLY_OFFSET;
00422       out->offset = AST_FRIENDLY_OFFSET;
00423       out->datalen = fr->datalen;
00424       memcpy(newdata, fr->data, fr->datalen);
00425       out->data = newdata;
00426    }
00427 
00428    out->mallocd = AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA;
00429    
00430    return out;
00431 }
00432 
00433 struct ast_frame *ast_frdup(const struct ast_frame *f)
00434 {
00435    struct ast_frame *out = NULL;
00436    int len, srclen = 0;
00437    void *buf = NULL;
00438 
00439 #if !defined(LOW_MEMORY)
00440    struct ast_frame_cache *frames;
00441 #endif
00442 
00443    /* Start with standard stuff */
00444    len = sizeof(*out) + AST_FRIENDLY_OFFSET + f->datalen;
00445    /* If we have a source, add space for it */
00446    /*
00447     * XXX Watch out here - if we receive a src which is not terminated
00448     * properly, we can be easily attacked. Should limit the size we deal with.
00449     */
00450    if (f->src)
00451       srclen = strlen(f->src);
00452    if (srclen > 0)
00453       len += srclen + 1;
00454    
00455 #if !defined(LOW_MEMORY)
00456    if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames)))) {
00457       AST_LIST_TRAVERSE_SAFE_BEGIN(&frames->list, out, frame_list) {
00458          if (out->mallocd_hdr_len >= len) {
00459             size_t mallocd_len = out->mallocd_hdr_len;
00460             AST_LIST_REMOVE_CURRENT(&frames->list, frame_list);
00461             memset(out, 0, sizeof(*out));
00462             out->mallocd_hdr_len = mallocd_len;
00463             buf = out;
00464             frames->size--;
00465             break;
00466          }
00467       }
00468       AST_LIST_TRAVERSE_SAFE_END
00469    }
00470 #endif
00471 
00472    if (!buf) {
00473       if (!(buf = ast_calloc_cache(1, len)))
00474          return NULL;
00475       out = buf;
00476       out->mallocd_hdr_len = len;
00477    }
00478 
00479    out->frametype = f->frametype;
00480    out->subclass = f->subclass;
00481    out->datalen = f->datalen;
00482    out->samples = f->samples;
00483    out->delivery = f->delivery;
00484    /* Set us as having malloc'd header only, so it will eventually
00485       get freed. */
00486    out->mallocd = AST_MALLOCD_HDR;
00487    out->offset = AST_FRIENDLY_OFFSET;
00488    if (out->datalen) {
00489       out->data = buf + sizeof(*out) + AST_FRIENDLY_OFFSET;
00490       memcpy(out->data, f->data, out->datalen); 
00491    }
00492    if (srclen > 0) {
00493       /* This may seem a little strange, but it's to avoid a gcc (4.2.4) compiler warning */
00494       char *src;
00495       out->src = buf + sizeof(*out) + AST_FRIENDLY_OFFSET + f->datalen;
00496       src = (char *) out->src;
00497       /* Must have space since we allocated for it */
00498       strcpy(src, f->src);
00499    }
00500    ast_copy_flags(out, f, AST_FRFLAG_HAS_TIMING_INFO);
00501    out->ts = f->ts;
00502    out->len = f->len;
00503    out->seqno = f->seqno;
00504    return out;
00505 }
00506 
00507 void ast_swapcopy_samples(void *dst, const void *src, int samples)
00508 {
00509    int i;
00510    unsigned short *dst_s = dst;
00511    const unsigned short *src_s = src;
00512 
00513    for (i = 0; i < samples; i++)
00514       dst_s[i] = (src_s[i]<<8) | (src_s[i]>>8);
00515 }
00516 
00517 
00518 struct ast_format_list *ast_get_format_list_index(int index) 
00519 {
00520    return &AST_FORMAT_LIST[index];
00521 }
00522 
00523 struct ast_format_list *ast_get_format_list(size_t *size) 
00524 {
00525    *size = (sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]));
00526    return AST_FORMAT_LIST;
00527 }
00528 
00529 char* ast_getformatname(int format)
00530 {
00531    int x;
00532    char *ret = "unknown";
00533    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
00534       if(AST_FORMAT_LIST[x].visible && AST_FORMAT_LIST[x].bits == format) {
00535          ret = AST_FORMAT_LIST[x].name;
00536          break;
00537       }
00538    }
00539    return ret;
00540 }
00541 
00542 char *ast_getformatname_multiple(char *buf, size_t size, int format)
00543 {
00544    int x;
00545    unsigned len;
00546    char *start, *end = buf;
00547 
00548    if (!size)
00549       return buf;
00550    snprintf(end, size, "0x%x (", format);
00551    len = strlen(end);
00552    end += len;
00553    size -= len;
00554    start = end;
00555    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
00556       if (AST_FORMAT_LIST[x].visible && (AST_FORMAT_LIST[x].bits & format)) {
00557          snprintf(end, size,"%s|",AST_FORMAT_LIST[x].name);
00558          len = strlen(end);
00559          end += len;
00560          size -= len;
00561       }
00562    }
00563    if (start == end)
00564       snprintf(start, size, "nothing)");
00565    else if (size > 1)
00566       *(end -1) = ')';
00567    return buf;
00568 }
00569 
00570 static struct ast_codec_alias_table {
00571    char *alias;
00572    char *realname;
00573 } ast_codec_alias_table[] = {
00574    { "slinear", "slin"},
00575    { "g723.1", "g723"},
00576 };
00577 
00578 static const char *ast_expand_codec_alias(const char *in)
00579 {
00580    int x;
00581 
00582    for (x = 0; x < sizeof(ast_codec_alias_table) / sizeof(ast_codec_alias_table[0]); x++) {
00583       if(!strcmp(in,ast_codec_alias_table[x].alias))
00584          return ast_codec_alias_table[x].realname;
00585    }
00586    return in;
00587 }
00588 
00589 int ast_getformatbyname(const char *name)
00590 {
00591    int x, all, format = 0;
00592 
00593    all = strcasecmp(name, "all") ? 0 : 1;
00594    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
00595       if(AST_FORMAT_LIST[x].visible && (all || 
00596            !strcasecmp(AST_FORMAT_LIST[x].name,name) ||
00597            !strcasecmp(AST_FORMAT_LIST[x].name,ast_expand_codec_alias(name)))) {
00598          format |= AST_FORMAT_LIST[x].bits;
00599          if(!all)
00600             break;
00601       }
00602    }
00603 
00604    return format;
00605 }
00606 
00607 char *ast_codec2str(int codec)
00608 {
00609    int x;
00610    char *ret = "unknown";
00611    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
00612       if(AST_FORMAT_LIST[x].visible && AST_FORMAT_LIST[x].bits == codec) {
00613          ret = AST_FORMAT_LIST[x].desc;
00614          break;
00615       }
00616    }
00617    return ret;
00618 }
00619 
00620 static int show_codecs_deprecated(int fd, int argc, char *argv[])
00621 {
00622    int i, found=0;
00623    char hex[25];
00624    
00625    if ((argc < 2) || (argc > 3))
00626       return RESULT_SHOWUSAGE;
00627 
00628    if (!ast_opt_dont_warn)
00629       ast_cli(fd, "Disclaimer: this command is for informational purposes only.\n"
00630             "\tIt does not indicate anything about your configuration.\n");
00631 
00632    ast_cli(fd, "%11s %9s %10s   TYPE   %8s   %s\n","INT","BINARY","HEX","NAME","DESC");
00633    ast_cli(fd, "--------------------------------------------------------------------------------\n");
00634    if ((argc == 2) || (!strcasecmp(argv[1],"audio"))) {
00635       found = 1;
00636       for (i=0;i<13;i++) {
00637          snprintf(hex,25,"(0x%x)",1<<i);
00638          ast_cli(fd, "%11u (1 << %2d) %10s  audio   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00639       }
00640    }
00641 
00642    if ((argc == 2) || (!strcasecmp(argv[1],"image"))) {
00643       found = 1;
00644       for (i=16;i<18;i++) {
00645          snprintf(hex,25,"(0x%x)",1<<i);
00646          ast_cli(fd, "%11u (1 << %2d) %10s  image   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00647       }
00648    }
00649 
00650    if ((argc == 2) || (!strcasecmp(argv[1],"video"))) {
00651       found = 1;
00652       for (i=18;i<22;i++) {
00653          snprintf(hex,25,"(0x%x)",1<<i);
00654          ast_cli(fd, "%11u (1 << %2d) %10s  video   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00655       }
00656    }
00657 
00658    if (! found)
00659       return RESULT_SHOWUSAGE;
00660    else
00661       return RESULT_SUCCESS;
00662 }
00663 
00664 static int show_codecs(int fd, int argc, char *argv[])
00665 {
00666    int i, found=0;
00667    char hex[25];
00668    
00669    if ((argc < 3) || (argc > 4))
00670       return RESULT_SHOWUSAGE;
00671 
00672    if (!ast_opt_dont_warn)
00673       ast_cli(fd, "Disclaimer: this command is for informational purposes only.\n"
00674             "\tIt does not indicate anything about your configuration.\n");
00675 
00676    ast_cli(fd, "%11s %9s %10s   TYPE   %8s   %s\n","INT","BINARY","HEX","NAME","DESC");
00677    ast_cli(fd, "--------------------------------------------------------------------------------\n");
00678    if ((argc == 3) || (!strcasecmp(argv[3],"audio"))) {
00679       found = 1;
00680       for (i=0;i<13;i++) {
00681          snprintf(hex,25,"(0x%x)",1<<i);
00682          ast_cli(fd, "%11u (1 << %2d) %10s  audio   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00683       }
00684    }
00685 
00686    if ((argc == 3) || (!strcasecmp(argv[3],"image"))) {
00687       found = 1;
00688       for (i=16;i<18;i++) {
00689          snprintf(hex,25,"(0x%x)",1<<i);
00690          ast_cli(fd, "%11u (1 << %2d) %10s  image   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00691       }
00692    }
00693 
00694    if ((argc == 3) || (!strcasecmp(argv[3],"video"))) {
00695       found = 1;
00696       for (i=18;i<22;i++) {
00697          snprintf(hex,25,"(0x%x)",1<<i);
00698          ast_cli(fd, "%11u (1 << %2d) %10s  video   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00699       }
00700    }
00701 
00702    if (! found)
00703       return RESULT_SHOWUSAGE;
00704    else
00705       return RESULT_SUCCESS;
00706 }
00707 
00708 static char frame_show_codecs_usage[] =
00709 "Usage: core show codecs [audio|video|image]\n"
00710 "       Displays codec mapping\n";
00711 
00712 static int show_codec_n_deprecated(int fd, int argc, char *argv[])
00713 {
00714    int codec, i, found=0;
00715 
00716    if (argc != 3)
00717       return RESULT_SHOWUSAGE;
00718 
00719    if (sscanf(argv[2],"%d",&codec) != 1)
00720       return RESULT_SHOWUSAGE;
00721 
00722    for (i = 0; i < 32; i++)
00723       if (codec & (1 << i)) {
00724          found = 1;
00725          ast_cli(fd, "%11u (1 << %2d)  %s\n",1 << i,i,ast_codec2str(1<<i));
00726       }
00727 
00728    if (!found)
00729       ast_cli(fd, "Codec %d not found\n", codec);
00730 
00731    return RESULT_SUCCESS;
00732 }
00733 
00734 static int show_codec_n(int fd, int argc, char *argv[])
00735 {
00736    int codec, i, found=0;
00737 
00738    if (argc != 4)
00739       return RESULT_SHOWUSAGE;
00740 
00741    if (sscanf(argv[3],"%d",&codec) != 1)
00742       return RESULT_SHOWUSAGE;
00743 
00744    for (i = 0; i < 32; i++)
00745       if (codec & (1 << i)) {
00746          found = 1;
00747          ast_cli(fd, "%11u (1 << %2d)  %s\n",1 << i,i,ast_codec2str(1<<i));
00748       }
00749 
00750    if (!found)
00751       ast_cli(fd, "Codec %d not found\n", codec);
00752 
00753    return RESULT_SUCCESS;
00754 }
00755 
00756 static char frame_show_codec_n_usage[] =
00757 "Usage: core show codec <number>\n"
00758 "       Displays codec mapping\n";
00759 
00760 /*! Dump a frame for debugging purposes */
00761 void ast_frame_dump(const char *name, struct ast_frame *f, char *prefix)
00762 {
00763    const char noname[] = "unknown";
00764    char ftype[40] = "Unknown Frametype";
00765    char cft[80];
00766    char subclass[40] = "Unknown Subclass";
00767    char csub[80];
00768    char moreinfo[40] = "";
00769    char cn[60];
00770    char cp[40];
00771    char cmn[40];
00772 
00773    if (!name)
00774       name = noname;
00775 
00776 
00777    if (!f) {
00778       ast_verbose("%s [ %s (NULL) ] [%s]\n", 
00779          term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00780          term_color(cft, "HANGUP", COLOR_BRRED, COLOR_BLACK, sizeof(cft)), 
00781          term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00782       return;
00783    }
00784    /* XXX We should probably print one each of voice and video when the format changes XXX */
00785    if (f->frametype == AST_FRAME_VOICE)
00786       return;
00787    if (f->frametype == AST_FRAME_VIDEO)
00788       return;
00789    switch(f->frametype) {
00790    case AST_FRAME_DTMF_BEGIN:
00791       strcpy(ftype, "DTMF Begin");
00792       subclass[0] = f->subclass;
00793       subclass[1] = '\0';
00794       break;
00795    case AST_FRAME_DTMF_END:
00796       strcpy(ftype, "DTMF End");
00797       subclass[0] = f->subclass;
00798       subclass[1] = '\0';
00799       break;
00800    case AST_FRAME_CONTROL:
00801       strcpy(ftype, "Control");
00802       switch(f->subclass) {
00803       case AST_CONTROL_HANGUP:
00804          strcpy(subclass, "Hangup");
00805          break;
00806       case AST_CONTROL_RING:
00807          strcpy(subclass, "Ring");
00808          break;
00809       case AST_CONTROL_RINGING:
00810          strcpy(subclass, "Ringing");
00811          break;
00812       case AST_CONTROL_ANSWER:
00813          strcpy(subclass, "Answer");
00814          break;
00815       case AST_CONTROL_BUSY:
00816          strcpy(subclass, "Busy");
00817          break;
00818       case AST_CONTROL_TAKEOFFHOOK:
00819          strcpy(subclass, "Take Off Hook");
00820          break;
00821       case AST_CONTROL_OFFHOOK:
00822          strcpy(subclass, "Line Off Hook");
00823          break;
00824       case AST_CONTROL_CONGESTION:
00825          strcpy(subclass, "Congestion");
00826          break;
00827       case AST_CONTROL_FLASH:
00828          strcpy(subclass, "Flash");
00829          break;
00830       case AST_CONTROL_WINK:
00831          strcpy(subclass, "Wink");
00832          break;
00833       case AST_CONTROL_OPTION:
00834          strcpy(subclass, "Option");
00835          break;
00836       case AST_CONTROL_RADIO_KEY:
00837          strcpy(subclass, "Key Radio");
00838          break;
00839       case AST_CONTROL_RADIO_UNKEY:
00840          strcpy(subclass, "Unkey Radio");
00841          break;
00842       case AST_CONTROL_PROGRESS:
00843          strcpy(subclass, "Call Progress");
00844          break;
00845       case AST_CONTROL_PROCEEDING:
00846          strcpy(subclass, "Proceeding");
00847          break;
00848       case AST_CONTROL_HOLD:
00849         strcpy(subclass, "Hold");
00850         break;
00851       case AST_CONTROL_UNHOLD:
00852         strcpy(subclass, "UnHold");
00853         break;
00854       case -1:
00855          strcpy(subclass, "Stop generators");
00856          break;
00857       default:
00858          snprintf(subclass, sizeof(subclass), "Unknown control '%d'", f->subclass);
00859       }
00860       break;
00861    case AST_FRAME_NULL:
00862       strcpy(ftype, "Null Frame");
00863       strcpy(subclass, "N/A");
00864       break;
00865    case AST_FRAME_IAX:
00866       /* Should never happen */
00867       strcpy(ftype, "IAX Specific");
00868       snprintf(subclass, sizeof(subclass), "IAX Frametype %d", f->subclass);
00869       break;
00870    case AST_FRAME_TEXT:
00871       strcpy(ftype, "Text");
00872       strcpy(subclass, "N/A");
00873       ast_copy_string(moreinfo, f->data, sizeof(moreinfo));
00874       break;
00875    case AST_FRAME_IMAGE:
00876       strcpy(ftype, "Image");
00877       snprintf(subclass, sizeof(subclass), "Image format %s\n", ast_getformatname(f->subclass));
00878       break;
00879    case AST_FRAME_HTML:
00880       strcpy(ftype, "HTML");
00881       switch(f->subclass) {
00882       case AST_HTML_URL:
00883          strcpy(subclass, "URL");
00884          ast_copy_string(moreinfo, f->data, sizeof(moreinfo));
00885          break;
00886       case AST_HTML_DATA:
00887          strcpy(subclass, "Data");
00888          break;
00889       case AST_HTML_BEGIN:
00890          strcpy(subclass, "Begin");
00891          break;
00892       case AST_HTML_END:
00893          strcpy(subclass, "End");
00894          break;
00895       case AST_HTML_LDCOMPLETE:
00896          strcpy(subclass, "Load Complete");
00897          break;
00898       case AST_HTML_NOSUPPORT:
00899          strcpy(subclass, "No Support");
00900          break;
00901       case AST_HTML_LINKURL:
00902          strcpy(subclass, "Link URL");
00903          ast_copy_string(moreinfo, f->data, sizeof(moreinfo));
00904          break;
00905       case AST_HTML_UNLINK:
00906          strcpy(subclass, "Unlink");
00907          break;
00908       case AST_HTML_LINKREJECT:
00909          strcpy(subclass, "Link Reject");
00910          break;
00911       default:
00912          snprintf(subclass, sizeof(subclass), "Unknown HTML frame '%d'\n", f->subclass);
00913          break;
00914       }
00915       break;
00916    case AST_FRAME_MODEM:
00917       strcpy(ftype, "Modem");
00918       switch (f->subclass) {
00919       case AST_MODEM_T38:
00920          strcpy(subclass, "T.38");
00921          break;
00922       case AST_MODEM_V150:
00923          strcpy(subclass, "V.150");
00924          break;
00925       default:
00926          snprintf(subclass, sizeof(subclass), "Unknown MODEM frame '%d'\n", f->subclass);
00927          break;
00928       }
00929       break;
00930    default:
00931       snprintf(ftype, sizeof(ftype), "Unknown Frametype '%d'", f->frametype);
00932    }
00933    if (!ast_strlen_zero(moreinfo))
00934       ast_verbose("%s [ TYPE: %s (%d) SUBCLASS: %s (%d) '%s' ] [%s]\n",  
00935              term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00936              term_color(cft, ftype, COLOR_BRRED, COLOR_BLACK, sizeof(cft)),
00937              f->frametype, 
00938              term_color(csub, subclass, COLOR_BRCYAN, COLOR_BLACK, sizeof(csub)),
00939              f->subclass, 
00940              term_color(cmn, moreinfo, COLOR_BRGREEN, COLOR_BLACK, sizeof(cmn)),
00941              term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00942    else
00943       ast_verbose("%s [ TYPE: %s (%d) SUBCLASS: %s (%d) ] [%s]\n",  
00944              term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00945              term_color(cft, ftype, COLOR_BRRED, COLOR_BLACK, sizeof(cft)),
00946              f->frametype, 
00947              term_color(csub, subclass, COLOR_BRCYAN, COLOR_BLACK, sizeof(csub)),
00948              f->subclass, 
00949              term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00950 }
00951 
00952 
00953 #ifdef TRACE_FRAMES
00954 static int show_frame_stats(int fd, int argc, char *argv[])
00955 {
00956    struct ast_frame *f;
00957    int x=1;
00958    if (argc != 4)
00959       return RESULT_SHOWUSAGE;
00960    AST_LIST_LOCK(&headerlist);
00961    ast_cli(fd, "     Framer Statistics     \n");
00962    ast_cli(fd, "---------------------------\n");
00963    ast_cli(fd, "Total allocated headers: %d\n", headers);
00964    ast_cli(fd, "Queue Dump:\n");
00965    AST_LIST_TRAVERSE(&headerlist, f, frame_list)
00966       ast_cli(fd, "%d.  Type %d, subclass %d from %s\n", x++, f->frametype, f->subclass, f->src ? f->src : "<Unknown>");
00967    AST_LIST_UNLOCK(&headerlist);
00968    return RESULT_SUCCESS;
00969 }
00970 
00971 static char frame_stats_usage[] =
00972 "Usage: core show frame stats\n"
00973 "       Displays debugging statistics from framer\n";
00974 #endif
00975 
00976 /* Builtin Asterisk CLI-commands for debugging */
00977 static struct ast_cli_entry cli_show_codecs = {
00978    { "show", "codecs", NULL },
00979    show_codecs_deprecated, NULL,
00980    NULL };
00981 
00982 static struct ast_cli_entry cli_show_audio_codecs = {
00983    { "show", "audio", "codecs", NULL },
00984    show_codecs_deprecated, NULL,
00985    NULL };
00986 
00987 static struct ast_cli_entry cli_show_video_codecs = {
00988    { "show", "video", "codecs", NULL },
00989    show_codecs_deprecated, NULL,
00990    NULL };
00991 
00992 static struct ast_cli_entry cli_show_image_codecs = {
00993    { "show", "image", "codecs", NULL },
00994    show_codecs_deprecated, NULL,
00995    NULL };
00996 
00997 static struct ast_cli_entry cli_show_codec = {
00998    { "show", "codec", NULL },
00999    show_codec_n_deprecated, NULL,
01000    NULL };
01001 
01002 #ifdef TRACE_FRAMES
01003 static struct ast_cli_entry cli_show_frame_stats = {
01004    { "show", "frame", "stats", NULL },
01005    show_frame_stats, NULL,
01006    NULL };
01007 #endif
01008 
01009 static struct ast_cli_entry my_clis[] = {
01010    { { "core", "show", "codecs", NULL },
01011    show_codecs, "Displays a list of codecs",
01012    frame_show_codecs_usage, NULL, &cli_show_codecs },
01013 
01014    { { "core", "show", "audio", "codecs", NULL },
01015    show_codecs, "Displays a list of audio codecs",
01016    frame_show_codecs_usage, NULL, &cli_show_audio_codecs },
01017 
01018    { { "core", "show", "video", "codecs", NULL },
01019    show_codecs, "Displays a list of video codecs",
01020    frame_show_codecs_usage, NULL, &cli_show_video_codecs },
01021 
01022    { { "core", "show", "image", "codecs", NULL },
01023    show_codecs, "Displays a list of image codecs",
01024    frame_show_codecs_usage, NULL, &cli_show_image_codecs },
01025 
01026    { { "core", "show", "codec", NULL },
01027    show_codec_n, "Shows a specific codec",
01028    frame_show_codec_n_usage, NULL, &cli_show_codec },
01029 
01030 #ifdef TRACE_FRAMES
01031    { { "core", "show", "frame", "stats", NULL },
01032    show_frame_stats, "Shows frame statistics",
01033    frame_stats_usage, NULL, &cli_show_frame_stats },
01034 #endif
01035 };
01036 
01037 int init_framer(void)
01038 {
01039    ast_cli_register_multiple(my_clis, sizeof(my_clis) / sizeof(struct ast_cli_entry));
01040    return 0;   
01041 }
01042 
01043 void ast_codec_pref_convert(struct ast_codec_pref *pref, char *buf, size_t size, int right) 
01044 {
01045    int x, differential = (int) 'A', mem;
01046    char *from, *to;
01047 
01048    if(right) {
01049       from = pref->order;
01050       to = buf;
01051       mem = size;
01052    } else {
01053       to = pref->order;
01054       from = buf;
01055       mem = 32;
01056    }
01057 
01058    memset(to, 0, mem);
01059    for (x = 0; x < 32 ; x++) {
01060       if(!from[x])
01061          break;
01062       to[x] = right ? (from[x] + differential) : (from[x] - differential);
01063    }
01064 }
01065 
01066 int ast_codec_pref_string(struct ast_codec_pref *pref, char *buf, size_t size) 
01067 {
01068    int x, codec; 
01069    size_t total_len, slen;
01070    char *formatname;
01071    
01072    memset(buf,0,size);
01073    total_len = size;
01074    buf[0] = '(';
01075    total_len--;
01076    for(x = 0; x < 32 ; x++) {
01077       if(total_len <= 0)
01078          break;
01079       if(!(codec = ast_codec_pref_index(pref,x)))
01080          break;
01081       if((formatname = ast_getformatname(codec))) {
01082          slen = strlen(formatname);
01083          if(slen > total_len)
01084             break;
01085          strncat(buf, formatname, total_len - 1); /* safe */
01086          total_len -= slen;
01087       }
01088       if(total_len && x < 31 && ast_codec_pref_index(pref , x + 1)) {
01089          strncat(buf, "|", total_len - 1); /* safe */
01090          total_len--;
01091       }
01092    }
01093    if(total_len) {
01094       strncat(buf, ")", total_len - 1); /* safe */
01095       total_len--;
01096    }
01097 
01098    return size - total_len;
01099 }
01100 
01101 int ast_codec_pref_index(struct ast_codec_pref *pref, int index) 
01102 {
01103    int slot = 0;
01104 
01105    
01106    if((index >= 0) && (index < sizeof(pref->order))) {
01107       slot = pref->order[index];
01108    }
01109 
01110    return slot ? AST_FORMAT_LIST[slot-1].bits : 0;
01111 }
01112 
01113 /*! \brief Remove codec from pref list */
01114 void ast_codec_pref_remove(struct ast_codec_pref *pref, int format)
01115 {
01116    struct ast_codec_pref oldorder;
01117    int x, y = 0;
01118    int slot;
01119    int size;
01120 
01121    if(!pref->order[0])
01122       return;
01123 
01124    memcpy(&oldorder, pref, sizeof(oldorder));
01125    memset(pref, 0, sizeof(*pref));
01126 
01127    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01128       slot = oldorder.order[x];
01129       size = oldorder.framing[x];
01130       if(! slot)
01131          break;
01132       if(AST_FORMAT_LIST[slot-1].bits != format) {
01133          pref->order[y] = slot;
01134          pref->framing[y++] = size;
01135       }
01136    }
01137    
01138 }
01139 
01140 /*! \brief Append codec to list */
01141 int ast_codec_pref_append(struct ast_codec_pref *pref, int format)
01142 {
01143    int x, newindex = 0;
01144 
01145    ast_codec_pref_remove(pref, format);
01146 
01147    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01148       if(AST_FORMAT_LIST[x].bits == format) {
01149          newindex = x + 1;
01150          break;
01151       }
01152    }
01153 
01154    if(newindex) {
01155       for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01156          if(!pref->order[x]) {
01157             pref->order[x] = newindex;
01158             break;
01159          }
01160       }
01161    }
01162 
01163    return x;
01164 }
01165 
01166 /*! \brief Prepend codec to list */
01167 void ast_codec_pref_prepend(struct ast_codec_pref *pref, int format, int only_if_existing)
01168 {
01169    int x, newindex = 0;
01170 
01171    /* First step is to get the codecs "index number" */
01172    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01173       if (AST_FORMAT_LIST[x].bits == format) {
01174          newindex = x + 1;
01175          break;
01176       }
01177    }
01178    /* Done if its unknown */
01179    if (!newindex)
01180       return;
01181 
01182    /* Now find any existing occurrence, or the end */
01183    for (x = 0; x < 32; x++) {
01184       if (!pref->order[x] || pref->order[x] == newindex)
01185          break;
01186    }
01187 
01188    if (only_if_existing && !pref->order[x])
01189       return;
01190 
01191    /* Move down to make space to insert - either all the way to the end,
01192       or as far as the existing location (which will be overwritten) */
01193    for (; x > 0; x--) {
01194       pref->order[x] = pref->order[x - 1];
01195       pref->framing[x] = pref->framing[x - 1];
01196    }
01197 
01198    /* And insert the new entry */
01199    pref->order[0] = newindex;
01200    pref->framing[0] = 0; /* ? */
01201 }
01202 
01203 /*! \brief Set packet size for codec */
01204 int ast_codec_pref_setsize(struct ast_codec_pref *pref, int format, int framems)
01205 {
01206    int x, index = -1;
01207 
01208    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01209       if(AST_FORMAT_LIST[x].bits == format) {
01210          index = x;
01211          break;
01212       }
01213    }
01214 
01215    if(index < 0)
01216       return -1;
01217 
01218    /* size validation */
01219    if(!framems)
01220       framems = AST_FORMAT_LIST[index].def_ms;
01221 
01222    if(AST_FORMAT_LIST[index].inc_ms && framems % AST_FORMAT_LIST[index].inc_ms) /* avoid division by zero */
01223       framems -= framems % AST_FORMAT_LIST[index].inc_ms;
01224 
01225    if(framems < AST_FORMAT_LIST[index].min_ms)
01226       framems = AST_FORMAT_LIST[index].min_ms;
01227 
01228    if(framems > AST_FORMAT_LIST[index].max_ms)
01229       framems = AST_FORMAT_LIST[index].max_ms;
01230 
01231 
01232    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01233       if(pref->order[x] == (index + 1)) {
01234          pref->framing[x] = framems;
01235          break;
01236       }
01237    }
01238 
01239    return x;
01240 }
01241 
01242 /*! \brief Get packet size for codec */
01243 struct ast_format_list ast_codec_pref_getsize(struct ast_codec_pref *pref, int format)
01244 {
01245    int x, index = -1, framems = 0;
01246    struct ast_format_list fmt = {0};
01247 
01248    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01249       if(AST_FORMAT_LIST[x].bits == format) {
01250          fmt = AST_FORMAT_LIST[x];
01251          index = x;
01252          break;
01253       }
01254    }
01255 
01256    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01257       if(pref->order[x] == (index + 1)) {
01258          framems = pref->framing[x];
01259          break;
01260       }
01261    }
01262 
01263    /* size validation */
01264    if(!framems)
01265       framems = AST_FORMAT_LIST[index].def_ms;
01266 
01267    if(AST_FORMAT_LIST[index].inc_ms && framems % AST_FORMAT_LIST[index].inc_ms) /* avoid division by zero */
01268       framems -= framems % AST_FORMAT_LIST[index].inc_ms;
01269 
01270    if(framems < AST_FORMAT_LIST[index].min_ms)
01271       framems = AST_FORMAT_LIST[index].min_ms;
01272 
01273    if(framems > AST_FORMAT_LIST[index].max_ms)
01274       framems = AST_FORMAT_LIST[index].max_ms;
01275 
01276    fmt.cur_ms = framems;
01277 
01278    return fmt;
01279 }
01280 
01281 /*! \brief Pick a codec */
01282 int ast_codec_choose(struct ast_codec_pref *pref, int formats, int find_best)
01283 {
01284    int x, ret = 0, slot;
01285 
01286    for (x = 0; x < sizeof(AST_FORMAT_LIST) / sizeof(AST_FORMAT_LIST[0]); x++) {
01287       slot = pref->order[x];
01288 
01289       if (!slot)
01290          break;
01291       if (formats & AST_FORMAT_LIST[slot-1].bits) {
01292          ret = AST_FORMAT_LIST[slot-1].bits;
01293          break;
01294       }
01295    }
01296    if(ret & AST_FORMAT_AUDIO_MASK)
01297       return ret;
01298 
01299    if (option_debug > 3)
01300       ast_log(LOG_DEBUG, "Could not find preferred codec - %s\n", find_best ? "Going for the best codec" : "Returning zero codec");
01301 
01302       return find_best ? ast_best_codec(formats) : 0;
01303 }
01304 
01305 void ast_parse_allow_disallow(struct ast_codec_pref *pref, int *mask, const char *list, int allowing) 
01306 {
01307    char *parse = NULL, *this = NULL, *psize = NULL;
01308    int format = 0, framems = 0;
01309 
01310    parse = ast_strdupa(list);
01311    while ((this = strsep(&parse, ","))) {
01312       framems = 0;
01313       if ((psize = strrchr(this, ':'))) {
01314          *psize++ = '\0';
01315          if (option_debug)
01316             ast_log(LOG_DEBUG,"Packetization for codec: %s is %s\n", this, psize);
01317          framems = atoi(psize);
01318          if (framems < 0)
01319             framems = 0;
01320       }
01321       if (!(format = ast_getformatbyname(this))) {
01322          ast_log(LOG_WARNING, "Cannot %s unknown format '%s'\n", allowing ? "allow" : "disallow", this);
01323          continue;
01324       }
01325 
01326       if (mask) {
01327          if (allowing)
01328             *mask |= format;
01329          else
01330             *mask &= ~format;
01331       }
01332 
01333       /* Set up a preference list for audio. Do not include video in preferences 
01334          since we can not transcode video and have to use whatever is offered
01335        */
01336       if (pref && (format & AST_FORMAT_AUDIO_MASK)) {
01337          if (strcasecmp(this, "all")) {
01338             if (allowing) {
01339                ast_codec_pref_append(pref, format);
01340                ast_codec_pref_setsize(pref, format, framems);
01341             }
01342             else
01343                ast_codec_pref_remove(pref, format);
01344          } else if (!allowing) {
01345             memset(pref, 0, sizeof(*pref));
01346          }
01347       }
01348    }
01349 }
01350 
01351 static int g723_len(unsigned char buf)
01352 {
01353    enum frame_type type = buf & TYPE_MASK;
01354 
01355    switch(type) {
01356    case TYPE_DONTSEND:
01357       return 0;
01358       break;
01359    case TYPE_SILENCE:
01360       return 4;
01361       break;
01362    case TYPE_HIGH:
01363       return 24;
01364       break;
01365    case TYPE_LOW:
01366       return 20;
01367       break;
01368    default:
01369       ast_log(LOG_WARNING, "Badly encoded frame (%d)\n", type);
01370    }
01371    return -1;
01372 }
01373 
01374 static int g723_samples(unsigned char *buf, int maxlen)
01375 {
01376    int pos = 0;
01377    int samples = 0;
01378    int res;
01379    while(pos < maxlen) {
01380       res = g723_len(buf[pos]);
01381       if (res <= 0)
01382          break;
01383       samples += 240;
01384       pos += res;
01385    }
01386    return samples;
01387 }
01388 
01389 static unsigned char get_n_bits_at(unsigned char *data, int n, int bit)
01390 {
01391    int byte = bit / 8;       /* byte containing first bit */
01392    int rem = 8 - (bit % 8);  /* remaining bits in first byte */
01393    unsigned char ret = 0;
01394    
01395    if (n <= 0 || n > 8)
01396       return 0;
01397 
01398    if (rem < n) {
01399       ret = (data[byte] << (n - rem));
01400       ret |= (data[byte + 1] >> (8 - n + rem));
01401    } else {
01402       ret = (data[byte] >> (rem - n));
01403    }
01404 
01405    return (ret & (0xff >> (8 - n)));
01406 }
01407 
01408 static int speex_get_wb_sz_at(unsigned char *data, int len, int bit)
01409 {
01410    static int SpeexWBSubModeSz[] = {
01411       0, 36, 112, 192,
01412       352, 0, 0, 0 };
01413    int off = bit;
01414    unsigned char c;
01415 
01416    /* skip up to two wideband frames */
01417    if (((len * 8 - off) >= 5) && 
01418       get_n_bits_at(data, 1, off)) {
01419       c = get_n_bits_at(data, 3, off + 1);
01420       off += SpeexWBSubModeSz[c];
01421 
01422       if (((len * 8 - off) >= 5) && 
01423          get_n_bits_at(data, 1, off)) {
01424          c = get_n_bits_at(data, 3, off + 1);
01425          off += SpeexWBSubModeSz[c];
01426 
01427          if (((len * 8 - off) >= 5) && 
01428             get_n_bits_at(data, 1, off)) {
01429             ast_log(LOG_WARNING, "Encountered corrupt speex frame; too many wideband frames in a row.\n");
01430             return -1;
01431          }
01432       }
01433 
01434    }
01435    return off - bit;
01436 }
01437 
01438 static int speex_samples(unsigned char *data, int len)
01439 {
01440    static int SpeexSubModeSz[] = {
01441                5, 43, 119, 160,
01442       220, 300, 364, 492, 
01443       79, 0, 0, 0,
01444       0, 0, 0, 0 };
01445    static int SpeexInBandSz[] = { 
01446       1, 1, 4, 4,
01447       4, 4, 4, 4,
01448       8, 8, 16, 16,
01449       32, 32, 64, 64 };
01450    int bit = 0;
01451    int cnt = 0;
01452    int off;
01453    unsigned char c;
01454 
01455    while ((len * 8 - bit) >= 5) {
01456       /* skip wideband frames */
01457       off = speex_get_wb_sz_at(data, len, bit);
01458       if (off < 0)  {
01459          ast_log(LOG_WARNING, "Had error while reading wideband frames for speex samples\n");
01460          break;
01461       }
01462       bit += off;
01463 
01464       if ((len * 8 - bit) < 5) {
01465          ast_log(LOG_WARNING, "Not enough bits remaining after wide band for speex samples.\n");
01466          break;
01467       }
01468 
01469       /* get control bits */
01470       c = get_n_bits_at(data, 5, bit);
01471       bit += 5;
01472 
01473       if (c == 15) { 
01474          /* terminator */
01475          break; 
01476       } else if (c == 14) {
01477          /* in-band signal; next 4 bits contain signal id */
01478          c = get_n_bits_at(data, 4, bit);
01479          bit += 4;
01480          bit += SpeexInBandSz[c];
01481       } else if (c == 13) {
01482          /* user in-band; next 5 bits contain msg len */
01483          c = get_n_bits_at(data, 5, bit);
01484          bit += 5;
01485          bit += c * 8;
01486       } else if (c > 8) {
01487          /* unknown */
01488          break;
01489       } else {
01490          /* skip number bits for submode (less the 5 control bits) */
01491          bit += SpeexSubModeSz[c] - 5;
01492          cnt += 160; /* new frame */
01493       }
01494    }
01495    return cnt;
01496 }
01497 
01498 int ast_codec_get_samples(struct ast_frame *f)
01499 {
01500    int samples=0;
01501    switch(f->subclass) {
01502    case AST_FORMAT_SPEEX:
01503       samples = speex_samples(f->data, f->datalen);
01504       break;
01505    case AST_FORMAT_G723_1:
01506                 samples = g723_samples(f->data, f->datalen);
01507       break;
01508    case AST_FORMAT_ILBC:
01509       samples = 240 * (f->datalen / 50);
01510       break;
01511    case AST_FORMAT_GSM:
01512       samples = 160 * (f->datalen / 33);
01513       break;
01514    case AST_FORMAT_G729A:
01515       samples = f->datalen * 8;
01516       break;
01517    case AST_FORMAT_SLINEAR:
01518       samples = f->datalen / 2;
01519       break;
01520    case AST_FORMAT_LPC10:
01521                 /* assumes that the RTP packet contains one LPC10 frame */
01522       samples = 22 * 8;
01523       samples += (((char *)(f->data))[7] & 0x1) * 8;
01524       break;
01525    case AST_FORMAT_ULAW:
01526    case AST_FORMAT_ALAW:
01527       samples = f->datalen;
01528       break;
01529    case AST_FORMAT_G722:
01530    case AST_FORMAT_ADPCM:
01531    case AST_FORMAT_G726:
01532    case AST_FORMAT_G726_AAL2:
01533       samples = f->datalen * 2;
01534       break;
01535    default:
01536       ast_log(LOG_WARNING, "Unable to calculate samples for format %s\n", ast_getformatname(f->subclass));
01537    }
01538    return samples;
01539 }
01540 
01541 int ast_codec_get_len(int format, int samples)
01542 {
01543    int len = 0;
01544 
01545    /* XXX Still need speex, g723, and lpc10 XXX */ 
01546    switch(format) {
01547    case AST_FORMAT_ILBC:
01548       len = (samples / 240) * 50;
01549       break;
01550    case AST_FORMAT_GSM:
01551       len = (samples / 160) * 33;
01552       break;
01553    case AST_FORMAT_G729A:
01554       len = samples / 8;
01555       break;
01556    case AST_FORMAT_SLINEAR:
01557       len = samples * 2;
01558       break;
01559    case AST_FORMAT_ULAW:
01560    case AST_FORMAT_ALAW:
01561       len = samples;
01562       break;
01563    case AST_FORMAT_G722:
01564    case AST_FORMAT_ADPCM:
01565    case AST_FORMAT_G726:
01566    case AST_FORMAT_G726_AAL2:
01567       len = samples / 2;
01568       break;
01569    default:
01570       ast_log(LOG_WARNING, "Unable to calculate sample length for format %s\n", ast_getformatname(format));
01571    }
01572 
01573    return len;
01574 }
01575 
01576 int ast_frame_adjust_volume(struct ast_frame *f, int adjustment)
01577 {
01578    int count;
01579    short *fdata = f->data;
01580    short adjust_value = abs(adjustment);
01581 
01582    if ((f->frametype != AST_FRAME_VOICE) || (f->subclass != AST_FORMAT_SLINEAR))
01583       return -1;
01584 
01585    if (!adjustment)
01586       return 0;
01587 
01588    for (count = 0; count < f->samples; count++) {
01589       if (adjustment > 0) {
01590          ast_slinear_saturated_multiply(&fdata[count], &adjust_value);
01591       } else if (adjustment < 0) {
01592          ast_slinear_saturated_divide(&fdata[count], &adjust_value);
01593       }
01594    }
01595 
01596    return 0;
01597 }
01598 
01599 int ast_frame_slinear_sum(struct ast_frame *f1, struct ast_frame *f2)
01600 {
01601    int count;
01602    short *data1, *data2;
01603 
01604    if ((f1->frametype != AST_FRAME_VOICE) || (f1->subclass != AST_FORMAT_SLINEAR))
01605       return -1;
01606 
01607    if ((f2->frametype != AST_FRAME_VOICE) || (f2->subclass != AST_FORMAT_SLINEAR))
01608       return -1;
01609 
01610    if (f1->samples != f2->samples)
01611       return -1;
01612 
01613    for (count = 0, data1 = f1->data, data2 = f2->data;
01614         count < f1->samples;
01615         count++, data1++, data2++)
01616       ast_slinear_saturated_add(data1, data2);
01617 
01618    return 0;
01619 }

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