Wed Oct 28 11:51:04 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: 224935 $")
00029 
00030 #include "asterisk/_private.h"
00031 #include "asterisk/lock.h"
00032 #include "asterisk/frame.h"
00033 #include "asterisk/channel.h"
00034 #include "asterisk/cli.h"
00035 #include "asterisk/term.h"
00036 #include "asterisk/utils.h"
00037 #include "asterisk/threadstorage.h"
00038 #include "asterisk/linkedlists.h"
00039 #include "asterisk/translate.h"
00040 #include "asterisk/dsp.h"
00041 #include "asterisk/file.h"
00042 
00043 #if !defined(LOW_MEMORY)
00044 static void frame_cache_cleanup(void *data);
00045 
00046 /*! \brief A per-thread cache of frame headers */
00047 AST_THREADSTORAGE_CUSTOM(frame_cache, NULL, frame_cache_cleanup);
00048 
00049 /*! 
00050  * \brief Maximum ast_frame cache size
00051  *
00052  * In most cases where the frame header cache will be useful, the size
00053  * of the cache will stay very small.  However, it is not always the case that
00054  * the same thread that allocates the frame will be the one freeing them, so
00055  * sometimes a thread will never have any frames in its cache, or the cache
00056  * will never be pulled from.  For the latter case, we limit the maximum size. 
00057  */ 
00058 #define FRAME_CACHE_MAX_SIZE  10
00059 
00060 /*! \brief This is just so ast_frames, a list head struct for holding a list of
00061  *  ast_frame structures, is defined. */
00062 AST_LIST_HEAD_NOLOCK(ast_frames, ast_frame);
00063 
00064 struct ast_frame_cache {
00065    struct ast_frames list;
00066    size_t size;
00067 };
00068 #endif
00069 
00070 #define SMOOTHER_SIZE 8000
00071 
00072 enum frame_type {
00073    TYPE_HIGH,     /* 0x0 */
00074    TYPE_LOW,      /* 0x1 */
00075    TYPE_SILENCE,  /* 0x2 */
00076    TYPE_DONTSEND  /* 0x3 */
00077 };
00078 
00079 #define TYPE_MASK 0x3
00080 
00081 struct ast_smoother {
00082    int size;
00083    int format;
00084    int flags;
00085    float samplesperbyte;
00086    unsigned int opt_needs_swap:1;
00087    struct ast_frame f;
00088    struct timeval delivery;
00089    char data[SMOOTHER_SIZE];
00090    char framedata[SMOOTHER_SIZE + AST_FRIENDLY_OFFSET];
00091    struct ast_frame *opt;
00092    int len;
00093 };
00094 
00095 /*! \brief Definition of supported media formats (codecs) */
00096 static struct ast_format_list AST_FORMAT_LIST[] = {
00097    { AST_FORMAT_G723_1 , "g723", 8000, "G.723.1", 20, 30, 300, 30, 30 },                                  /*!< G723.1 */
00098    { AST_FORMAT_GSM, "gsm", 8000, "GSM", 33, 20, 300, 20, 20 },                                           /*!< codec_gsm.c */
00099    { AST_FORMAT_ULAW, "ulaw", 8000, "G.711 u-law", 80, 10, 150, 10, 20 },                                 /*!< codec_ulaw.c */
00100    { AST_FORMAT_ALAW, "alaw", 8000, "G.711 A-law", 80, 10, 150, 10, 20 },                                 /*!< codec_alaw.c */
00101    { AST_FORMAT_G726, "g726", 8000, "G.726 RFC3551", 40, 10, 300, 10, 20 },                               /*!< codec_g726.c */
00102    { AST_FORMAT_ADPCM, "adpcm" , 8000, "ADPCM", 40, 10, 300, 10, 20 },                                    /*!< codec_adpcm.c */
00103    { AST_FORMAT_SLINEAR, "slin", 8000, "16 bit Signed Linear PCM", 160, 10, 70, 10, 20, AST_SMOOTHER_FLAG_BE }, /*!< Signed linear */
00104    { AST_FORMAT_LPC10, "lpc10", 8000, "LPC10", 7, 20, 20, 20, 20 },                                       /*!< codec_lpc10.c */ 
00105    { AST_FORMAT_G729A, "g729", 8000, "G.729A", 10, 10, 230, 10, 20, AST_SMOOTHER_FLAG_G729 },             /*!< Binary commercial distribution */
00106    { AST_FORMAT_SPEEX, "speex", 8000, "SpeeX", 10, 10, 60, 10, 20 },                                      /*!< codec_speex.c */
00107    { AST_FORMAT_ILBC, "ilbc", 8000, "iLBC", 50, 30, 30, 30, 30 },                                         /*!< codec_ilbc.c */ /* inc=30ms - workaround */
00108    { AST_FORMAT_G726_AAL2, "g726aal2", 8000, "G.726 AAL2", 40, 10, 300, 10, 20 },                         /*!< codec_g726.c */
00109    { AST_FORMAT_G722, "g722", 16000, "G722", 80, 10, 150, 10, 20 },                                       /*!< codec_g722.c */
00110    { AST_FORMAT_SLINEAR16, "slin16", 16000, "16 bit Signed Linear PCM (16kHz)", 320, 10, 70, 10, 20, AST_SMOOTHER_FLAG_BE },    /*!< Signed linear (16kHz) */
00111    { AST_FORMAT_JPEG, "jpeg", 0, "JPEG image"},                                                           /*!< See format_jpeg.c */
00112    { AST_FORMAT_PNG, "png", 0, "PNG image"},                                                              /*!< PNG Image format */
00113    { AST_FORMAT_H261, "h261", 0, "H.261 Video" },                                                         /*!< H.261 Video Passthrough */
00114    { AST_FORMAT_H263, "h263", 0, "H.263 Video" },                                                         /*!< H.263 Passthrough support, see format_h263.c */
00115    { AST_FORMAT_H263_PLUS, "h263p", 0, "H.263+ Video" },                                                  /*!< H.263plus passthrough support See format_h263.c */
00116    { AST_FORMAT_H264, "h264", 0, "H.264 Video" },                                                         /*!< Passthrough support, see format_h263.c */
00117    { AST_FORMAT_MP4_VIDEO, "mpeg4", 0, "MPEG4 Video" },                                                   /*!< Passthrough support for MPEG4 */
00118    { AST_FORMAT_T140RED, "red", 1, "T.140 Realtime Text with redundancy"},                                 /*!< Redundant T.140 Realtime Text */
00119    { AST_FORMAT_T140, "t140", 0, "Passthrough T.140 Realtime Text" },                                     /*!< Passthrough support for T.140 Realtime Text */
00120 };
00121 
00122 struct ast_frame ast_null_frame = { AST_FRAME_NULL, };
00123 
00124 static int smoother_frame_feed(struct ast_smoother *s, struct ast_frame *f, int swap)
00125 {
00126    if (s->flags & AST_SMOOTHER_FLAG_G729) {
00127       if (s->len % 10) {
00128          ast_log(LOG_NOTICE, "Dropping extra frame of G.729 since we already have a VAD frame at the end\n");
00129          return 0;
00130       }
00131    }
00132    if (swap) {
00133       ast_swapcopy_samples(s->data + s->len, f->data.ptr, f->samples);
00134    } else {
00135       memcpy(s->data + s->len, f->data.ptr, f->datalen);
00136    }
00137    /* If either side is empty, reset the delivery time */
00138    if (!s->len || ast_tvzero(f->delivery) || ast_tvzero(s->delivery)) { /* XXX really ? */
00139       s->delivery = f->delivery;
00140    }
00141    s->len += f->datalen;
00142 
00143    return 0;
00144 }
00145 
00146 void ast_smoother_reset(struct ast_smoother *s, int bytes)
00147 {
00148    memset(s, 0, sizeof(*s));
00149    s->size = bytes;
00150 }
00151 
00152 void ast_smoother_reconfigure(struct ast_smoother *s, int bytes)
00153 {
00154    /* if there is no change, then nothing to do */
00155    if (s->size == bytes) {
00156       return;
00157    }
00158    /* set the new desired output size */
00159    s->size = bytes;
00160    /* if there is no 'optimized' frame in the smoother,
00161     *   then there is nothing left to do
00162     */
00163    if (!s->opt) {
00164       return;
00165    }
00166    /* there is an 'optimized' frame here at the old size,
00167     * but it must now be put into the buffer so the data
00168     * can be extracted at the new size
00169     */
00170    smoother_frame_feed(s, s->opt, s->opt_needs_swap);
00171    s->opt = NULL;
00172 }
00173 
00174 struct ast_smoother *ast_smoother_new(int size)
00175 {
00176    struct ast_smoother *s;
00177    if (size < 1)
00178       return NULL;
00179    if ((s = ast_malloc(sizeof(*s))))
00180       ast_smoother_reset(s, size);
00181    return s;
00182 }
00183 
00184 int ast_smoother_get_flags(struct ast_smoother *s)
00185 {
00186    return s->flags;
00187 }
00188 
00189 void ast_smoother_set_flags(struct ast_smoother *s, int flags)
00190 {
00191    s->flags = flags;
00192 }
00193 
00194 int ast_smoother_test_flag(struct ast_smoother *s, int flag)
00195 {
00196    return (s->flags & flag);
00197 }
00198 
00199 int __ast_smoother_feed(struct ast_smoother *s, struct ast_frame *f, int swap)
00200 {
00201    if (f->frametype != AST_FRAME_VOICE) {
00202       ast_log(LOG_WARNING, "Huh?  Can't smooth a non-voice frame!\n");
00203       return -1;
00204    }
00205    if (!s->format) {
00206       s->format = f->subclass;
00207       s->samplesperbyte = (float)f->samples / (float)f->datalen;
00208    } else if (s->format != f->subclass) {
00209       ast_log(LOG_WARNING, "Smoother was working on %d format frames, now trying to feed %d?\n", s->format, f->subclass);
00210       return -1;
00211    }
00212    if (s->len + f->datalen > SMOOTHER_SIZE) {
00213       ast_log(LOG_WARNING, "Out of smoother space\n");
00214       return -1;
00215    }
00216    if (((f->datalen == s->size) ||
00217         ((f->datalen < 10) && (s->flags & AST_SMOOTHER_FLAG_G729))) &&
00218        !s->opt &&
00219        !s->len &&
00220        (f->offset >= AST_MIN_OFFSET)) {
00221       /* Optimize by sending the frame we just got
00222          on the next read, thus eliminating the douple
00223          copy */
00224       if (swap)
00225          ast_swapcopy_samples(f->data.ptr, f->data.ptr, f->samples);
00226       s->opt = f;
00227       s->opt_needs_swap = swap ? 1 : 0;
00228       return 0;
00229    }
00230 
00231    return smoother_frame_feed(s, f, swap);
00232 }
00233 
00234 struct ast_frame *ast_smoother_read(struct ast_smoother *s)
00235 {
00236    struct ast_frame *opt;
00237    int len;
00238 
00239    /* IF we have an optimization frame, send it */
00240    if (s->opt) {
00241       if (s->opt->offset < AST_FRIENDLY_OFFSET)
00242          ast_log(LOG_WARNING, "Returning a frame of inappropriate offset (%d).\n",
00243                      s->opt->offset);
00244       opt = s->opt;
00245       s->opt = NULL;
00246       return opt;
00247    }
00248 
00249    /* Make sure we have enough data */
00250    if (s->len < s->size) {
00251       /* Or, if this is a G.729 frame with VAD on it, send it immediately anyway */
00252       if (!((s->flags & AST_SMOOTHER_FLAG_G729) && (s->len % 10)))
00253          return NULL;
00254    }
00255    len = s->size;
00256    if (len > s->len)
00257       len = s->len;
00258    /* Make frame */
00259    s->f.frametype = AST_FRAME_VOICE;
00260    s->f.subclass = s->format;
00261    s->f.data.ptr = s->framedata + AST_FRIENDLY_OFFSET;
00262    s->f.offset = AST_FRIENDLY_OFFSET;
00263    s->f.datalen = len;
00264    /* Samples will be improper given VAD, but with VAD the concept really doesn't even exist */
00265    s->f.samples = len * s->samplesperbyte;   /* XXX rounding */
00266    s->f.delivery = s->delivery;
00267    /* Fill Data */
00268    memcpy(s->f.data.ptr, s->data, len);
00269    s->len -= len;
00270    /* Move remaining data to the front if applicable */
00271    if (s->len) {
00272       /* In principle this should all be fine because if we are sending
00273          G.729 VAD, the next timestamp will take over anyawy */
00274       memmove(s->data, s->data + len, s->len);
00275       if (!ast_tvzero(s->delivery)) {
00276          /* If we have delivery time, increment it, otherwise, leave it at 0 */
00277          s->delivery = ast_tvadd(s->delivery, ast_samp2tv(s->f.samples, ast_format_rate(s->format)));
00278       }
00279    }
00280    /* Return frame */
00281    return &s->f;
00282 }
00283 
00284 void ast_smoother_free(struct ast_smoother *s)
00285 {
00286    ast_free(s);
00287 }
00288 
00289 static struct ast_frame *ast_frame_header_new(void)
00290 {
00291    struct ast_frame *f;
00292 
00293 #if !defined(LOW_MEMORY)
00294    struct ast_frame_cache *frames;
00295 
00296    if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames)))) {
00297       if ((f = AST_LIST_REMOVE_HEAD(&frames->list, frame_list))) {
00298          size_t mallocd_len = f->mallocd_hdr_len;
00299          memset(f, 0, sizeof(*f));
00300          f->mallocd_hdr_len = mallocd_len;
00301          f->mallocd = AST_MALLOCD_HDR;
00302          frames->size--;
00303          return f;
00304       }
00305    }
00306    if (!(f = ast_calloc_cache(1, sizeof(*f))))
00307       return NULL;
00308 #else
00309    if (!(f = ast_calloc(1, sizeof(*f))))
00310       return NULL;
00311 #endif
00312 
00313    f->mallocd_hdr_len = sizeof(*f);
00314    
00315    return f;
00316 }
00317 
00318 #if !defined(LOW_MEMORY)
00319 static void frame_cache_cleanup(void *data)
00320 {
00321    struct ast_frame_cache *frames = data;
00322    struct ast_frame *f;
00323 
00324    while ((f = AST_LIST_REMOVE_HEAD(&frames->list, frame_list)))
00325       ast_free(f);
00326    
00327    ast_free(frames);
00328 }
00329 #endif
00330 
00331 static void __frame_free(struct ast_frame *fr, int cache)
00332 {
00333    if (!fr->mallocd)
00334       return;
00335 
00336 #if !defined(LOW_MEMORY)
00337    if (cache && fr->mallocd == AST_MALLOCD_HDR) {
00338       /* Cool, only the header is malloc'd, let's just cache those for now 
00339        * to keep things simple... */
00340       struct ast_frame_cache *frames;
00341 
00342       if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames))) &&
00343           (frames->size < FRAME_CACHE_MAX_SIZE)) {
00344          AST_LIST_INSERT_HEAD(&frames->list, fr, frame_list);
00345          frames->size++;
00346          return;
00347       }
00348    }
00349 #endif
00350    
00351    if (fr->mallocd & AST_MALLOCD_DATA) {
00352       if (fr->data.ptr) 
00353          ast_free(fr->data.ptr - fr->offset);
00354    }
00355    if (fr->mallocd & AST_MALLOCD_SRC) {
00356       if (fr->src)
00357          ast_free((void *) fr->src);
00358    }
00359    if (fr->mallocd & AST_MALLOCD_HDR) {
00360       ast_free(fr);
00361    }
00362 }
00363 
00364 
00365 void ast_frame_free(struct ast_frame *frame, int cache)
00366 {
00367    struct ast_frame *next;
00368 
00369    for (next = AST_LIST_NEXT(frame, frame_list);
00370         frame;
00371         frame = next, next = frame ? AST_LIST_NEXT(frame, frame_list) : NULL) {
00372       __frame_free(frame, cache);
00373    }
00374 }
00375 
00376 /*!
00377  * \brief 'isolates' a frame by duplicating non-malloc'ed components
00378  * (header, src, data).
00379  * On return all components are malloc'ed
00380  */
00381 struct ast_frame *ast_frisolate(struct ast_frame *fr)
00382 {
00383    struct ast_frame *out;
00384    void *newdata;
00385 
00386    /* if none of the existing frame is malloc'd, let ast_frdup() do it
00387       since it is more efficient
00388    */
00389    if (fr->mallocd == 0) {
00390       return ast_frdup(fr);
00391    }
00392 
00393    /* if everything is already malloc'd, we are done */
00394    if ((fr->mallocd & (AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA)) ==
00395        (AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA)) {
00396       return fr;
00397    }
00398 
00399    if (!(fr->mallocd & AST_MALLOCD_HDR)) {
00400       /* Allocate a new header if needed */
00401       if (!(out = ast_frame_header_new())) {
00402          return NULL;
00403       }
00404       out->frametype = fr->frametype;
00405       out->subclass = fr->subclass;
00406       out->datalen = fr->datalen;
00407       out->samples = fr->samples;
00408       out->offset = fr->offset;
00409       /* Copy the timing data */
00410       ast_copy_flags(out, fr, AST_FRFLAG_HAS_TIMING_INFO);
00411       if (ast_test_flag(fr, AST_FRFLAG_HAS_TIMING_INFO)) {
00412          out->ts = fr->ts;
00413          out->len = fr->len;
00414          out->seqno = fr->seqno;
00415       }
00416    } else {
00417       out = fr;
00418    }
00419    
00420    if (!(fr->mallocd & AST_MALLOCD_SRC) && fr->src) {
00421       if (!(out->src = ast_strdup(fr->src))) {
00422          if (out != fr) {
00423             ast_free(out);
00424          }
00425          return NULL;
00426       }
00427    } else {
00428       out->src = fr->src;
00429       fr->src = NULL;
00430       fr->mallocd &= ~AST_MALLOCD_SRC;
00431    }
00432    
00433    if (!(fr->mallocd & AST_MALLOCD_DATA))  {
00434       if (!(newdata = ast_malloc(fr->datalen + AST_FRIENDLY_OFFSET))) {
00435          if (out->src != fr->src) {
00436             ast_free((void *) out->src);
00437          }
00438          if (out != fr) {
00439             ast_free(out);
00440          }
00441          return NULL;
00442       }
00443       newdata += AST_FRIENDLY_OFFSET;
00444       out->offset = AST_FRIENDLY_OFFSET;
00445       out->datalen = fr->datalen;
00446       memcpy(newdata, fr->data.ptr, fr->datalen);
00447       out->data.ptr = newdata;
00448    } else {
00449       out->data = fr->data;
00450       memset(&fr->data, 0, sizeof(fr->data));
00451       fr->mallocd &= ~AST_MALLOCD_DATA;
00452    }
00453 
00454    out->mallocd = AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA;
00455    
00456    return out;
00457 }
00458 
00459 struct ast_frame *ast_frdup(const struct ast_frame *f)
00460 {
00461    struct ast_frame *out = NULL;
00462    int len, srclen = 0;
00463    void *buf = NULL;
00464 
00465 #if !defined(LOW_MEMORY)
00466    struct ast_frame_cache *frames;
00467 #endif
00468 
00469    /* Start with standard stuff */
00470    len = sizeof(*out) + AST_FRIENDLY_OFFSET + f->datalen;
00471    /* If we have a source, add space for it */
00472    /*
00473     * XXX Watch out here - if we receive a src which is not terminated
00474     * properly, we can be easily attacked. Should limit the size we deal with.
00475     */
00476    if (f->src)
00477       srclen = strlen(f->src);
00478    if (srclen > 0)
00479       len += srclen + 1;
00480    
00481 #if !defined(LOW_MEMORY)
00482    if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames)))) {
00483       AST_LIST_TRAVERSE_SAFE_BEGIN(&frames->list, out, frame_list) {
00484          if (out->mallocd_hdr_len >= len) {
00485             size_t mallocd_len = out->mallocd_hdr_len;
00486 
00487             AST_LIST_REMOVE_CURRENT(frame_list);
00488             memset(out, 0, sizeof(*out));
00489             out->mallocd_hdr_len = mallocd_len;
00490             buf = out;
00491             frames->size--;
00492             break;
00493          }
00494       }
00495       AST_LIST_TRAVERSE_SAFE_END;
00496    }
00497 #endif
00498 
00499    if (!buf) {
00500       if (!(buf = ast_calloc_cache(1, len)))
00501          return NULL;
00502       out = buf;
00503       out->mallocd_hdr_len = len;
00504    }
00505 
00506    out->frametype = f->frametype;
00507    out->subclass = f->subclass;
00508    out->datalen = f->datalen;
00509    out->samples = f->samples;
00510    out->delivery = f->delivery;
00511    /* Set us as having malloc'd header only, so it will eventually
00512       get freed. */
00513    out->mallocd = AST_MALLOCD_HDR;
00514    out->offset = AST_FRIENDLY_OFFSET;
00515    if (out->datalen) {
00516       out->data.ptr = buf + sizeof(*out) + AST_FRIENDLY_OFFSET;
00517       memcpy(out->data.ptr, f->data.ptr, out->datalen);  
00518    } else {
00519       out->data.uint32 = f->data.uint32;
00520    }
00521    if (srclen > 0) {
00522       /* This may seem a little strange, but it's to avoid a gcc (4.2.4) compiler warning */
00523       char *src;
00524       out->src = buf + sizeof(*out) + AST_FRIENDLY_OFFSET + f->datalen;
00525       src = (char *) out->src;
00526       /* Must have space since we allocated for it */
00527       strcpy(src, f->src);
00528    }
00529    ast_copy_flags(out, f, AST_FRFLAG_HAS_TIMING_INFO);
00530    out->ts = f->ts;
00531    out->len = f->len;
00532    out->seqno = f->seqno;
00533    return out;
00534 }
00535 
00536 void ast_swapcopy_samples(void *dst, const void *src, int samples)
00537 {
00538    int i;
00539    unsigned short *dst_s = dst;
00540    const unsigned short *src_s = src;
00541 
00542    for (i = 0; i < samples; i++)
00543       dst_s[i] = (src_s[i]<<8) | (src_s[i]>>8);
00544 }
00545 
00546 
00547 struct ast_format_list *ast_get_format_list_index(int idx) 
00548 {
00549    return &AST_FORMAT_LIST[idx];
00550 }
00551 
00552 struct ast_format_list *ast_get_format_list(size_t *size) 
00553 {
00554    *size = ARRAY_LEN(AST_FORMAT_LIST);
00555    return AST_FORMAT_LIST;
00556 }
00557 
00558 char* ast_getformatname(int format)
00559 {
00560    int x;
00561    char *ret = "unknown";
00562    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00563       if (AST_FORMAT_LIST[x].bits == format) {
00564          ret = AST_FORMAT_LIST[x].name;
00565          break;
00566       }
00567    }
00568    return ret;
00569 }
00570 
00571 char *ast_getformatname_multiple(char *buf, size_t size, int format)
00572 {
00573    int x;
00574    unsigned len;
00575    char *start, *end = buf;
00576 
00577    if (!size)
00578       return buf;
00579    snprintf(end, size, "0x%x (", format);
00580    len = strlen(end);
00581    end += len;
00582    size -= len;
00583    start = end;
00584    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00585       if (AST_FORMAT_LIST[x].bits & format) {
00586          snprintf(end, size,"%s|",AST_FORMAT_LIST[x].name);
00587          len = strlen(end);
00588          end += len;
00589          size -= len;
00590       }
00591    }
00592    if (start == end)
00593       ast_copy_string(start, "nothing)", size);
00594    else if (size > 1)
00595       *(end -1) = ')';
00596    return buf;
00597 }
00598 
00599 static struct ast_codec_alias_table {
00600    char *alias;
00601    char *realname;
00602 } ast_codec_alias_table[] = {
00603    { "slinear", "slin"},
00604    { "slinear16", "slin16"},
00605    { "g723.1", "g723"},
00606 };
00607 
00608 static const char *ast_expand_codec_alias(const char *in)
00609 {
00610    int x;
00611 
00612    for (x = 0; x < ARRAY_LEN(ast_codec_alias_table); x++) {
00613       if (!strcmp(in,ast_codec_alias_table[x].alias))
00614          return ast_codec_alias_table[x].realname;
00615    }
00616    return in;
00617 }
00618 
00619 int ast_getformatbyname(const char *name)
00620 {
00621    int x, all, format = 0;
00622 
00623    all = strcasecmp(name, "all") ? 0 : 1;
00624    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00625       if (all || 
00626            !strcasecmp(AST_FORMAT_LIST[x].name,name) ||
00627            !strcasecmp(AST_FORMAT_LIST[x].name, ast_expand_codec_alias(name))) {
00628          format |= AST_FORMAT_LIST[x].bits;
00629          if (!all)
00630             break;
00631       }
00632    }
00633 
00634    return format;
00635 }
00636 
00637 char *ast_codec2str(int codec)
00638 {
00639    int x;
00640    char *ret = "unknown";
00641    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00642       if (AST_FORMAT_LIST[x].bits == codec) {
00643          ret = AST_FORMAT_LIST[x].desc;
00644          break;
00645       }
00646    }
00647    return ret;
00648 }
00649 
00650 static char *show_codecs(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00651 {
00652    int i, found=0;
00653    char hex[25];
00654 
00655    switch (cmd) {
00656    case CLI_INIT:
00657       e->command = "core show codecs [audio|video|image]";
00658       e->usage = 
00659          "Usage: core show codecs [audio|video|image]\n"
00660          "       Displays codec mapping\n";
00661       return NULL;
00662    case CLI_GENERATE:
00663       return NULL;
00664    }
00665    
00666    if ((a->argc < 3) || (a->argc > 4))
00667       return CLI_SHOWUSAGE;
00668 
00669    if (!ast_opt_dont_warn)
00670       ast_cli(a->fd, "Disclaimer: this command is for informational purposes only.\n"
00671             "\tIt does not indicate anything about your configuration.\n");
00672 
00673    ast_cli(a->fd, "%11s %9s %10s   TYPE   %8s   %s\n","INT","BINARY","HEX","NAME","DESC");
00674    ast_cli(a->fd, "--------------------------------------------------------------------------------\n");
00675    if ((a->argc == 3) || (!strcasecmp(a->argv[3],"audio"))) {
00676       found = 1;
00677       for (i=0;i<13;i++) {
00678          snprintf(hex,25,"(0x%x)",1<<i);
00679          ast_cli(a->fd, "%11u (1 << %2d) %10s  audio   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00680       }
00681    }
00682 
00683    if ((a->argc == 3) || (!strcasecmp(a->argv[3],"image"))) {
00684       found = 1;
00685       for (i=16;i<18;i++) {
00686          snprintf(hex,25,"(0x%x)",1<<i);
00687          ast_cli(a->fd, "%11u (1 << %2d) %10s  image   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00688       }
00689    }
00690 
00691    if ((a->argc == 3) || (!strcasecmp(a->argv[3],"video"))) {
00692       found = 1;
00693       for (i=18;i<22;i++) {
00694          snprintf(hex,25,"(0x%x)",1<<i);
00695          ast_cli(a->fd, "%11u (1 << %2d) %10s  video   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00696       }
00697    }
00698 
00699    if (!found)
00700       return CLI_SHOWUSAGE;
00701    else
00702       return CLI_SUCCESS;
00703 }
00704 
00705 static char *show_codec_n(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00706 {
00707    int codec, i, found=0;
00708 
00709    switch (cmd) {
00710    case CLI_INIT:
00711       e->command = "core show codec";
00712       e->usage = 
00713          "Usage: core show codec <number>\n"
00714          "       Displays codec mapping\n";
00715       return NULL;
00716    case CLI_GENERATE:
00717       return NULL;
00718    }
00719 
00720    if (a->argc != 4)
00721       return CLI_SHOWUSAGE;
00722 
00723    if (sscanf(a->argv[3], "%30d", &codec) != 1)
00724       return CLI_SHOWUSAGE;
00725 
00726    for (i = 0; i < 32; i++)
00727       if (codec & (1 << i)) {
00728          found = 1;
00729          ast_cli(a->fd, "%11u (1 << %2d)  %s\n",1 << i,i,ast_codec2str(1<<i));
00730       }
00731 
00732    if (!found)
00733       ast_cli(a->fd, "Codec %d not found\n", codec);
00734 
00735    return CLI_SUCCESS;
00736 }
00737 
00738 /*! Dump a frame for debugging purposes */
00739 void ast_frame_dump(const char *name, struct ast_frame *f, char *prefix)
00740 {
00741    const char noname[] = "unknown";
00742    char ftype[40] = "Unknown Frametype";
00743    char cft[80];
00744    char subclass[40] = "Unknown Subclass";
00745    char csub[80];
00746    char moreinfo[40] = "";
00747    char cn[60];
00748    char cp[40];
00749    char cmn[40];
00750    const char *message = "Unknown";
00751 
00752    if (!name)
00753       name = noname;
00754 
00755 
00756    if (!f) {
00757       ast_verbose("%s [ %s (NULL) ] [%s]\n", 
00758          term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00759          term_color(cft, "HANGUP", COLOR_BRRED, COLOR_BLACK, sizeof(cft)), 
00760          term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00761       return;
00762    }
00763    /* XXX We should probably print one each of voice and video when the format changes XXX */
00764    if (f->frametype == AST_FRAME_VOICE)
00765       return;
00766    if (f->frametype == AST_FRAME_VIDEO)
00767       return;
00768    switch(f->frametype) {
00769    case AST_FRAME_DTMF_BEGIN:
00770       strcpy(ftype, "DTMF Begin");
00771       subclass[0] = f->subclass;
00772       subclass[1] = '\0';
00773       break;
00774    case AST_FRAME_DTMF_END:
00775       strcpy(ftype, "DTMF End");
00776       subclass[0] = f->subclass;
00777       subclass[1] = '\0';
00778       break;
00779    case AST_FRAME_CONTROL:
00780       strcpy(ftype, "Control");
00781       switch(f->subclass) {
00782       case AST_CONTROL_HANGUP:
00783          strcpy(subclass, "Hangup");
00784          break;
00785       case AST_CONTROL_RING:
00786          strcpy(subclass, "Ring");
00787          break;
00788       case AST_CONTROL_RINGING:
00789          strcpy(subclass, "Ringing");
00790          break;
00791       case AST_CONTROL_ANSWER:
00792          strcpy(subclass, "Answer");
00793          break;
00794       case AST_CONTROL_BUSY:
00795          strcpy(subclass, "Busy");
00796          break;
00797       case AST_CONTROL_TAKEOFFHOOK:
00798          strcpy(subclass, "Take Off Hook");
00799          break;
00800       case AST_CONTROL_OFFHOOK:
00801          strcpy(subclass, "Line Off Hook");
00802          break;
00803       case AST_CONTROL_CONGESTION:
00804          strcpy(subclass, "Congestion");
00805          break;
00806       case AST_CONTROL_FLASH:
00807          strcpy(subclass, "Flash");
00808          break;
00809       case AST_CONTROL_WINK:
00810          strcpy(subclass, "Wink");
00811          break;
00812       case AST_CONTROL_OPTION:
00813          strcpy(subclass, "Option");
00814          break;
00815       case AST_CONTROL_RADIO_KEY:
00816          strcpy(subclass, "Key Radio");
00817          break;
00818       case AST_CONTROL_RADIO_UNKEY:
00819          strcpy(subclass, "Unkey Radio");
00820          break;
00821       case AST_CONTROL_HOLD:
00822          strcpy(subclass, "Hold");
00823          break;
00824       case AST_CONTROL_UNHOLD:
00825          strcpy(subclass, "Unhold");
00826          break;
00827       case AST_CONTROL_T38_PARAMETERS:
00828          if (f->datalen != sizeof(struct ast_control_t38_parameters)) {
00829             message = "Invalid";
00830          } else {
00831             struct ast_control_t38_parameters *parameters = f->data.ptr;
00832             enum ast_control_t38 state = parameters->request_response;
00833             if (state == AST_T38_REQUEST_NEGOTIATE)
00834                message = "Negotiation Requested";
00835             else if (state == AST_T38_REQUEST_TERMINATE)
00836                message = "Negotiation Request Terminated";
00837             else if (state == AST_T38_NEGOTIATED)
00838                message = "Negotiated";
00839             else if (state == AST_T38_TERMINATED)
00840                message = "Terminated";
00841             else if (state == AST_T38_REFUSED)
00842                message = "Refused";
00843          }
00844          snprintf(subclass, sizeof(subclass), "T38_Parameters/%s", message);
00845          break;
00846       case -1:
00847          strcpy(subclass, "Stop generators");
00848          break;
00849       default:
00850          snprintf(subclass, sizeof(subclass), "Unknown control '%d'", f->subclass);
00851       }
00852       break;
00853    case AST_FRAME_NULL:
00854       strcpy(ftype, "Null Frame");
00855       strcpy(subclass, "N/A");
00856       break;
00857    case AST_FRAME_IAX:
00858       /* Should never happen */
00859       strcpy(ftype, "IAX Specific");
00860       snprintf(subclass, sizeof(subclass), "IAX Frametype %d", f->subclass);
00861       break;
00862    case AST_FRAME_TEXT:
00863       strcpy(ftype, "Text");
00864       strcpy(subclass, "N/A");
00865       ast_copy_string(moreinfo, f->data.ptr, sizeof(moreinfo));
00866       break;
00867    case AST_FRAME_IMAGE:
00868       strcpy(ftype, "Image");
00869       snprintf(subclass, sizeof(subclass), "Image format %s\n", ast_getformatname(f->subclass));
00870       break;
00871    case AST_FRAME_HTML:
00872       strcpy(ftype, "HTML");
00873       switch(f->subclass) {
00874       case AST_HTML_URL:
00875          strcpy(subclass, "URL");
00876          ast_copy_string(moreinfo, f->data.ptr, sizeof(moreinfo));
00877          break;
00878       case AST_HTML_DATA:
00879          strcpy(subclass, "Data");
00880          break;
00881       case AST_HTML_BEGIN:
00882          strcpy(subclass, "Begin");
00883          break;
00884       case AST_HTML_END:
00885          strcpy(subclass, "End");
00886          break;
00887       case AST_HTML_LDCOMPLETE:
00888          strcpy(subclass, "Load Complete");
00889          break;
00890       case AST_HTML_NOSUPPORT:
00891          strcpy(subclass, "No Support");
00892          break;
00893       case AST_HTML_LINKURL:
00894          strcpy(subclass, "Link URL");
00895          ast_copy_string(moreinfo, f->data.ptr, sizeof(moreinfo));
00896          break;
00897       case AST_HTML_UNLINK:
00898          strcpy(subclass, "Unlink");
00899          break;
00900       case AST_HTML_LINKREJECT:
00901          strcpy(subclass, "Link Reject");
00902          break;
00903       default:
00904          snprintf(subclass, sizeof(subclass), "Unknown HTML frame '%d'\n", f->subclass);
00905          break;
00906       }
00907       break;
00908    case AST_FRAME_MODEM:
00909       strcpy(ftype, "Modem");
00910       switch (f->subclass) {
00911       case AST_MODEM_T38:
00912          strcpy(subclass, "T.38");
00913          break;
00914       case AST_MODEM_V150:
00915          strcpy(subclass, "V.150");
00916          break;
00917       default:
00918          snprintf(subclass, sizeof(subclass), "Unknown MODEM frame '%d'\n", f->subclass);
00919          break;
00920       }
00921       break;
00922    default:
00923       snprintf(ftype, sizeof(ftype), "Unknown Frametype '%d'", f->frametype);
00924    }
00925    if (!ast_strlen_zero(moreinfo))
00926       ast_verbose("%s [ TYPE: %s (%d) SUBCLASS: %s (%d) '%s' ] [%s]\n",  
00927              term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00928              term_color(cft, ftype, COLOR_BRRED, COLOR_BLACK, sizeof(cft)),
00929              f->frametype, 
00930              term_color(csub, subclass, COLOR_BRCYAN, COLOR_BLACK, sizeof(csub)),
00931              f->subclass, 
00932              term_color(cmn, moreinfo, COLOR_BRGREEN, COLOR_BLACK, sizeof(cmn)),
00933              term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00934    else
00935       ast_verbose("%s [ TYPE: %s (%d) SUBCLASS: %s (%d) ] [%s]\n",  
00936              term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00937              term_color(cft, ftype, COLOR_BRRED, COLOR_BLACK, sizeof(cft)),
00938              f->frametype, 
00939              term_color(csub, subclass, COLOR_BRCYAN, COLOR_BLACK, sizeof(csub)),
00940              f->subclass, 
00941              term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00942 }
00943 
00944 
00945 /* Builtin Asterisk CLI-commands for debugging */
00946 static struct ast_cli_entry my_clis[] = {
00947    AST_CLI_DEFINE(show_codecs, "Displays a list of codecs"),
00948    AST_CLI_DEFINE(show_codec_n, "Shows a specific codec"),
00949 };
00950 
00951 int init_framer(void)
00952 {
00953    ast_cli_register_multiple(my_clis, sizeof(my_clis) / sizeof(struct ast_cli_entry));
00954    return 0;   
00955 }
00956 
00957 void ast_codec_pref_convert(struct ast_codec_pref *pref, char *buf, size_t size, int right) 
00958 {
00959    int x, differential = (int) 'A', mem;
00960    char *from, *to;
00961 
00962    if (right) {
00963       from = pref->order;
00964       to = buf;
00965       mem = size;
00966    } else {
00967       to = pref->order;
00968       from = buf;
00969       mem = 32;
00970    }
00971 
00972    memset(to, 0, mem);
00973    for (x = 0; x < 32 ; x++) {
00974       if (!from[x])
00975          break;
00976       to[x] = right ? (from[x] + differential) : (from[x] - differential);
00977    }
00978 }
00979 
00980 int ast_codec_pref_string(struct ast_codec_pref *pref, char *buf, size_t size) 
00981 {
00982    int x, codec; 
00983    size_t total_len, slen;
00984    char *formatname;
00985    
00986    memset(buf,0,size);
00987    total_len = size;
00988    buf[0] = '(';
00989    total_len--;
00990    for(x = 0; x < 32 ; x++) {
00991       if (total_len <= 0)
00992          break;
00993       if (!(codec = ast_codec_pref_index(pref,x)))
00994          break;
00995       if ((formatname = ast_getformatname(codec))) {
00996          slen = strlen(formatname);
00997          if (slen > total_len)
00998             break;
00999          strncat(buf, formatname, total_len - 1); /* safe */
01000          total_len -= slen;
01001       }
01002       if (total_len && x < 31 && ast_codec_pref_index(pref , x + 1)) {
01003          strncat(buf, "|", total_len - 1); /* safe */
01004          total_len--;
01005       }
01006    }
01007    if (total_len) {
01008       strncat(buf, ")", total_len - 1); /* safe */
01009       total_len--;
01010    }
01011 
01012    return size - total_len;
01013 }
01014 
01015 int ast_codec_pref_index(struct ast_codec_pref *pref, int idx)
01016 {
01017    int slot = 0;
01018 
01019    if ((idx >= 0) && (idx < sizeof(pref->order))) {
01020       slot = pref->order[idx];
01021    }
01022 
01023    return slot ? AST_FORMAT_LIST[slot - 1].bits : 0;
01024 }
01025 
01026 /*! \brief Remove codec from pref list */
01027 void ast_codec_pref_remove(struct ast_codec_pref *pref, int format)
01028 {
01029    struct ast_codec_pref oldorder;
01030    int x, y = 0;
01031    int slot;
01032    int size;
01033 
01034    if (!pref->order[0])
01035       return;
01036 
01037    memcpy(&oldorder, pref, sizeof(oldorder));
01038    memset(pref, 0, sizeof(*pref));
01039 
01040    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01041       slot = oldorder.order[x];
01042       size = oldorder.framing[x];
01043       if (! slot)
01044          break;
01045       if (AST_FORMAT_LIST[slot-1].bits != format) {
01046          pref->order[y] = slot;
01047          pref->framing[y++] = size;
01048       }
01049    }
01050    
01051 }
01052 
01053 /*! \brief Append codec to list */
01054 int ast_codec_pref_append(struct ast_codec_pref *pref, int format)
01055 {
01056    int x, newindex = 0;
01057 
01058    ast_codec_pref_remove(pref, format);
01059 
01060    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01061       if (AST_FORMAT_LIST[x].bits == format) {
01062          newindex = x + 1;
01063          break;
01064       }
01065    }
01066 
01067    if (newindex) {
01068       for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01069          if (!pref->order[x]) {
01070             pref->order[x] = newindex;
01071             break;
01072          }
01073       }
01074    }
01075 
01076    return x;
01077 }
01078 
01079 /*! \brief Prepend codec to list */
01080 void ast_codec_pref_prepend(struct ast_codec_pref *pref, int format, int only_if_existing)
01081 {
01082    int x, newindex = 0;
01083 
01084    /* First step is to get the codecs "index number" */
01085    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01086       if (AST_FORMAT_LIST[x].bits == format) {
01087          newindex = x + 1;
01088          break;
01089       }
01090    }
01091    /* Done if its unknown */
01092    if (!newindex)
01093       return;
01094 
01095    /* Now find any existing occurrence, or the end */
01096    for (x = 0; x < 32; x++) {
01097       if (!pref->order[x] || pref->order[x] == newindex)
01098          break;
01099    }
01100 
01101    if (only_if_existing && !pref->order[x])
01102       return;
01103 
01104    /* Move down to make space to insert - either all the way to the end,
01105       or as far as the existing location (which will be overwritten) */
01106    for (; x > 0; x--) {
01107       pref->order[x] = pref->order[x - 1];
01108       pref->framing[x] = pref->framing[x - 1];
01109    }
01110 
01111    /* And insert the new entry */
01112    pref->order[0] = newindex;
01113    pref->framing[0] = 0; /* ? */
01114 }
01115 
01116 /*! \brief Set packet size for codec */
01117 int ast_codec_pref_setsize(struct ast_codec_pref *pref, int format, int framems)
01118 {
01119    int x, idx = -1;
01120 
01121    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01122       if (AST_FORMAT_LIST[x].bits == format) {
01123          idx = x;
01124          break;
01125       }
01126    }
01127 
01128    if (idx < 0)
01129       return -1;
01130 
01131    /* size validation */
01132    if (!framems)
01133       framems = AST_FORMAT_LIST[idx].def_ms;
01134 
01135    if (AST_FORMAT_LIST[idx].inc_ms && framems % AST_FORMAT_LIST[idx].inc_ms) /* avoid division by zero */
01136       framems -= framems % AST_FORMAT_LIST[idx].inc_ms;
01137 
01138    if (framems < AST_FORMAT_LIST[idx].min_ms)
01139       framems = AST_FORMAT_LIST[idx].min_ms;
01140 
01141    if (framems > AST_FORMAT_LIST[idx].max_ms)
01142       framems = AST_FORMAT_LIST[idx].max_ms;
01143 
01144    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01145       if (pref->order[x] == (idx + 1)) {
01146          pref->framing[x] = framems;
01147          break;
01148       }
01149    }
01150 
01151    return x;
01152 }
01153 
01154 /*! \brief Get packet size for codec */
01155 struct ast_format_list ast_codec_pref_getsize(struct ast_codec_pref *pref, int format)
01156 {
01157    int x, idx = -1, framems = 0;
01158    struct ast_format_list fmt = { 0, };
01159 
01160    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01161       if (AST_FORMAT_LIST[x].bits == format) {
01162          fmt = AST_FORMAT_LIST[x];
01163          idx = x;
01164          break;
01165       }
01166    }
01167 
01168    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01169       if (pref->order[x] == (idx + 1)) {
01170          framems = pref->framing[x];
01171          break;
01172       }
01173    }
01174 
01175    /* size validation */
01176    if (!framems)
01177       framems = AST_FORMAT_LIST[idx].def_ms;
01178 
01179    if (AST_FORMAT_LIST[idx].inc_ms && framems % AST_FORMAT_LIST[idx].inc_ms) /* avoid division by zero */
01180       framems -= framems % AST_FORMAT_LIST[idx].inc_ms;
01181 
01182    if (framems < AST_FORMAT_LIST[idx].min_ms)
01183       framems = AST_FORMAT_LIST[idx].min_ms;
01184 
01185    if (framems > AST_FORMAT_LIST[idx].max_ms)
01186       framems = AST_FORMAT_LIST[idx].max_ms;
01187 
01188    fmt.cur_ms = framems;
01189 
01190    return fmt;
01191 }
01192 
01193 /*! \brief Pick a codec */
01194 int ast_codec_choose(struct ast_codec_pref *pref, int formats, int find_best)
01195 {
01196    int x, ret = 0, slot;
01197 
01198    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01199       slot = pref->order[x];
01200 
01201       if (!slot)
01202          break;
01203       if (formats & AST_FORMAT_LIST[slot-1].bits) {
01204          ret = AST_FORMAT_LIST[slot-1].bits;
01205          break;
01206       }
01207    }
01208    if (ret & AST_FORMAT_AUDIO_MASK)
01209       return ret;
01210 
01211    ast_debug(4, "Could not find preferred codec - %s\n", find_best ? "Going for the best codec" : "Returning zero codec");
01212 
01213       return find_best ? ast_best_codec(formats) : 0;
01214 }
01215 
01216 int ast_parse_allow_disallow(struct ast_codec_pref *pref, int *mask, const char *list, int allowing) 
01217 {
01218    int errors = 0;
01219    char *parse = NULL, *this = NULL, *psize = NULL;
01220    int format = 0, framems = 0;
01221 
01222    parse = ast_strdupa(list);
01223    while ((this = strsep(&parse, ","))) {
01224       framems = 0;
01225       if ((psize = strrchr(this, ':'))) {
01226          *psize++ = '\0';
01227          ast_debug(1, "Packetization for codec: %s is %s\n", this, psize);
01228          framems = atoi(psize);
01229          if (framems < 0) {
01230             framems = 0;
01231             errors++;
01232             ast_log(LOG_WARNING, "Bad packetization value for codec %s\n", this);
01233          }
01234       }
01235       if (!(format = ast_getformatbyname(this))) {
01236          ast_log(LOG_WARNING, "Cannot %s unknown format '%s'\n", allowing ? "allow" : "disallow", this);
01237          errors++;
01238          continue;
01239       }
01240 
01241       if (mask) {
01242          if (allowing)
01243             *mask |= format;
01244          else
01245             *mask &= ~format;
01246       }
01247 
01248       /* Set up a preference list for audio. Do not include video in preferences 
01249          since we can not transcode video and have to use whatever is offered
01250        */
01251       if (pref && (format & AST_FORMAT_AUDIO_MASK)) {
01252          if (strcasecmp(this, "all")) {
01253             if (allowing) {
01254                ast_codec_pref_append(pref, format);
01255                ast_codec_pref_setsize(pref, format, framems);
01256             }
01257             else
01258                ast_codec_pref_remove(pref, format);
01259          } else if (!allowing) {
01260             memset(pref, 0, sizeof(*pref));
01261          }
01262       }
01263    }
01264    return errors;
01265 }
01266 
01267 static int g723_len(unsigned char buf)
01268 {
01269    enum frame_type type = buf & TYPE_MASK;
01270 
01271    switch(type) {
01272    case TYPE_DONTSEND:
01273       return 0;
01274       break;
01275    case TYPE_SILENCE:
01276       return 4;
01277       break;
01278    case TYPE_HIGH:
01279       return 24;
01280       break;
01281    case TYPE_LOW:
01282       return 20;
01283       break;
01284    default:
01285       ast_log(LOG_WARNING, "Badly encoded frame (%d)\n", type);
01286    }
01287    return -1;
01288 }
01289 
01290 static int g723_samples(unsigned char *buf, int maxlen)
01291 {
01292    int pos = 0;
01293    int samples = 0;
01294    int res;
01295    while(pos < maxlen) {
01296       res = g723_len(buf[pos]);
01297       if (res <= 0)
01298          break;
01299       samples += 240;
01300       pos += res;
01301    }
01302    return samples;
01303 }
01304 
01305 static unsigned char get_n_bits_at(unsigned char *data, int n, int bit)
01306 {
01307    int byte = bit / 8;       /* byte containing first bit */
01308    int rem = 8 - (bit % 8);  /* remaining bits in first byte */
01309    unsigned char ret = 0;
01310    
01311    if (n <= 0 || n > 8)
01312       return 0;
01313 
01314    if (rem < n) {
01315       ret = (data[byte] << (n - rem));
01316       ret |= (data[byte + 1] >> (8 - n + rem));
01317    } else {
01318       ret = (data[byte] >> (rem - n));
01319    }
01320 
01321    return (ret & (0xff >> (8 - n)));
01322 }
01323 
01324 static int speex_get_wb_sz_at(unsigned char *data, int len, int bit)
01325 {
01326    static int SpeexWBSubModeSz[] = {
01327       0, 36, 112, 192,
01328       352, 0, 0, 0 };
01329    int off = bit;
01330    unsigned char c;
01331 
01332    /* skip up to two wideband frames */
01333    if (((len * 8 - off) >= 5) && 
01334       get_n_bits_at(data, 1, off)) {
01335       c = get_n_bits_at(data, 3, off + 1);
01336       off += SpeexWBSubModeSz[c];
01337 
01338       if (((len * 8 - off) >= 5) && 
01339          get_n_bits_at(data, 1, off)) {
01340          c = get_n_bits_at(data, 3, off + 1);
01341          off += SpeexWBSubModeSz[c];
01342 
01343          if (((len * 8 - off) >= 5) && 
01344             get_n_bits_at(data, 1, off)) {
01345             ast_log(LOG_WARNING, "Encountered corrupt speex frame; too many wideband frames in a row.\n");
01346             return -1;
01347          }
01348       }
01349 
01350    }
01351    return off - bit;
01352 }
01353 
01354 static int speex_samples(unsigned char *data, int len)
01355 {
01356    static int SpeexSubModeSz[] = {
01357       5, 43, 119, 160,
01358       220, 300, 364, 492, 
01359       79, 0, 0, 0,
01360       0, 0, 0, 0 };
01361    static int SpeexInBandSz[] = { 
01362       1, 1, 4, 4,
01363       4, 4, 4, 4,
01364       8, 8, 16, 16,
01365       32, 32, 64, 64 };
01366    int bit = 0;
01367    int cnt = 0;
01368    int off;
01369    unsigned char c;
01370 
01371    while ((len * 8 - bit) >= 5) {
01372       /* skip wideband frames */
01373       off = speex_get_wb_sz_at(data, len, bit);
01374       if (off < 0)  {
01375          ast_log(LOG_WARNING, "Had error while reading wideband frames for speex samples\n");
01376          break;
01377       }
01378       bit += off;
01379 
01380       if ((len * 8 - bit) < 5) {
01381          ast_log(LOG_WARNING, "Not enough bits remaining after wide band for speex samples.\n");
01382          break;
01383       }
01384 
01385       /* get control bits */
01386       c = get_n_bits_at(data, 5, bit);
01387       bit += 5;
01388 
01389       if (c == 15) { 
01390          /* terminator */
01391          break; 
01392       } else if (c == 14) {
01393          /* in-band signal; next 4 bits contain signal id */
01394          c = get_n_bits_at(data, 4, bit);
01395          bit += 4;
01396          bit += SpeexInBandSz[c];
01397       } else if (c == 13) {
01398          /* user in-band; next 5 bits contain msg len */
01399          c = get_n_bits_at(data, 5, bit);
01400          bit += 5;
01401          bit += c * 8;
01402       } else if (c > 8) {
01403          /* unknown */
01404          break;
01405       } else {
01406          /* skip number bits for submode (less the 5 control bits) */
01407          bit += SpeexSubModeSz[c] - 5;
01408          cnt += 160; /* new frame */
01409       }
01410    }
01411    return cnt;
01412 }
01413 
01414 int ast_codec_get_samples(struct ast_frame *f)
01415 {
01416    int samples=0;
01417    switch(f->subclass) {
01418    case AST_FORMAT_SPEEX:
01419       samples = speex_samples(f->data.ptr, f->datalen);
01420       break;
01421    case AST_FORMAT_G723_1:
01422       samples = g723_samples(f->data.ptr, f->datalen);
01423       break;
01424    case AST_FORMAT_ILBC:
01425       samples = 240 * (f->datalen / 50);
01426       break;
01427    case AST_FORMAT_GSM:
01428       samples = 160 * (f->datalen / 33);
01429       break;
01430    case AST_FORMAT_G729A:
01431       samples = f->datalen * 8;
01432       break;
01433    case AST_FORMAT_SLINEAR:
01434    case AST_FORMAT_SLINEAR16:
01435       samples = f->datalen / 2;
01436       break;
01437    case AST_FORMAT_LPC10:
01438       /* assumes that the RTP packet contains one LPC10 frame */
01439       samples = 22 * 8;
01440       samples += (((char *)(f->data.ptr))[7] & 0x1) * 8;
01441       break;
01442    case AST_FORMAT_ULAW:
01443    case AST_FORMAT_ALAW:
01444       samples = f->datalen;
01445       break;
01446    case AST_FORMAT_G722:
01447    case AST_FORMAT_ADPCM:
01448    case AST_FORMAT_G726:
01449    case AST_FORMAT_G726_AAL2:
01450       samples = f->datalen * 2;
01451       break;
01452    default:
01453       ast_log(LOG_WARNING, "Unable to calculate samples for format %s\n", ast_getformatname(f->subclass));
01454    }
01455    return samples;
01456 }
01457 
01458 int ast_codec_get_len(int format, int samples)
01459 {
01460    int len = 0;
01461 
01462    /* XXX Still need speex, g723, and lpc10 XXX */ 
01463    switch(format) {
01464    case AST_FORMAT_G723_1:
01465       len = (samples / 240) * 20;
01466       break;
01467    case AST_FORMAT_ILBC:
01468       len = (samples / 240) * 50;
01469       break;
01470    case AST_FORMAT_GSM:
01471       len = (samples / 160) * 33;
01472       break;
01473    case AST_FORMAT_G729A:
01474       len = samples / 8;
01475       break;
01476    case AST_FORMAT_SLINEAR:
01477    case AST_FORMAT_SLINEAR16:
01478       len = samples * 2;
01479       break;
01480    case AST_FORMAT_ULAW:
01481    case AST_FORMAT_ALAW:
01482       len = samples;
01483       break;
01484    case AST_FORMAT_G722:
01485    case AST_FORMAT_ADPCM:
01486    case AST_FORMAT_G726:
01487    case AST_FORMAT_G726_AAL2:
01488       len = samples / 2;
01489       break;
01490    default:
01491       ast_log(LOG_WARNING, "Unable to calculate sample length for format %s\n", ast_getformatname(format));
01492    }
01493 
01494    return len;
01495 }
01496 
01497 int ast_frame_adjust_volume(struct ast_frame *f, int adjustment)
01498 {
01499    int count;
01500    short *fdata = f->data.ptr;
01501    short adjust_value = abs(adjustment);
01502 
01503    if ((f->frametype != AST_FRAME_VOICE) || (f->subclass != AST_FORMAT_SLINEAR))
01504       return -1;
01505 
01506    if (!adjustment)
01507       return 0;
01508 
01509    for (count = 0; count < f->samples; count++) {
01510       if (adjustment > 0) {
01511          ast_slinear_saturated_multiply(&fdata[count], &adjust_value);
01512       } else if (adjustment < 0) {
01513          ast_slinear_saturated_divide(&fdata[count], &adjust_value);
01514       }
01515    }
01516 
01517    return 0;
01518 }
01519 
01520 int ast_frame_slinear_sum(struct ast_frame *f1, struct ast_frame *f2)
01521 {
01522    int count;
01523    short *data1, *data2;
01524 
01525    if ((f1->frametype != AST_FRAME_VOICE) || (f1->subclass != AST_FORMAT_SLINEAR))
01526       return -1;
01527 
01528    if ((f2->frametype != AST_FRAME_VOICE) || (f2->subclass != AST_FORMAT_SLINEAR))
01529       return -1;
01530 
01531    if (f1->samples != f2->samples)
01532       return -1;
01533 
01534    for (count = 0, data1 = f1->data.ptr, data2 = f2->data.ptr;
01535         count < f1->samples;
01536         count++, data1++, data2++)
01537       ast_slinear_saturated_add(data1, data2);
01538 
01539    return 0;
01540 }

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