Thu Oct 11 06:47:16 2012

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: 269977 $")
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 const 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    { AST_FORMAT_SIREN7, "siren7", 16000, "ITU G.722.1 (Siren7, licensed from Polycom)", 80, 20, 80, 20, 20 },        /*!< Binary commercial distribution */
00121    { AST_FORMAT_SIREN14, "siren14", 32000, "ITU G.722.1 Annex C, (Siren14, licensed from Polycom)", 120, 20, 80, 20, 20 }, /*!< Binary commercial distribution */
00122 };
00123 
00124 struct ast_frame ast_null_frame = { AST_FRAME_NULL, };
00125 
00126 static int smoother_frame_feed(struct ast_smoother *s, struct ast_frame *f, int swap)
00127 {
00128    if (s->flags & AST_SMOOTHER_FLAG_G729) {
00129       if (s->len % 10) {
00130          ast_log(LOG_NOTICE, "Dropping extra frame of G.729 since we already have a VAD frame at the end\n");
00131          return 0;
00132       }
00133    }
00134    if (swap) {
00135       ast_swapcopy_samples(s->data + s->len, f->data.ptr, f->samples);
00136    } else {
00137       memcpy(s->data + s->len, f->data.ptr, f->datalen);
00138    }
00139    /* If either side is empty, reset the delivery time */
00140    if (!s->len || ast_tvzero(f->delivery) || ast_tvzero(s->delivery)) { /* XXX really ? */
00141       s->delivery = f->delivery;
00142    }
00143    s->len += f->datalen;
00144 
00145    return 0;
00146 }
00147 
00148 void ast_smoother_reset(struct ast_smoother *s, int bytes)
00149 {
00150    memset(s, 0, sizeof(*s));
00151    s->size = bytes;
00152 }
00153 
00154 void ast_smoother_reconfigure(struct ast_smoother *s, int bytes)
00155 {
00156    /* if there is no change, then nothing to do */
00157    if (s->size == bytes) {
00158       return;
00159    }
00160    /* set the new desired output size */
00161    s->size = bytes;
00162    /* if there is no 'optimized' frame in the smoother,
00163     *   then there is nothing left to do
00164     */
00165    if (!s->opt) {
00166       return;
00167    }
00168    /* there is an 'optimized' frame here at the old size,
00169     * but it must now be put into the buffer so the data
00170     * can be extracted at the new size
00171     */
00172    smoother_frame_feed(s, s->opt, s->opt_needs_swap);
00173    s->opt = NULL;
00174 }
00175 
00176 struct ast_smoother *ast_smoother_new(int size)
00177 {
00178    struct ast_smoother *s;
00179    if (size < 1)
00180       return NULL;
00181    if ((s = ast_malloc(sizeof(*s))))
00182       ast_smoother_reset(s, size);
00183    return s;
00184 }
00185 
00186 int ast_smoother_get_flags(struct ast_smoother *s)
00187 {
00188    return s->flags;
00189 }
00190 
00191 void ast_smoother_set_flags(struct ast_smoother *s, int flags)
00192 {
00193    s->flags = flags;
00194 }
00195 
00196 int ast_smoother_test_flag(struct ast_smoother *s, int flag)
00197 {
00198    return (s->flags & flag);
00199 }
00200 
00201 int __ast_smoother_feed(struct ast_smoother *s, struct ast_frame *f, int swap)
00202 {
00203    if (f->frametype != AST_FRAME_VOICE) {
00204       ast_log(LOG_WARNING, "Huh?  Can't smooth a non-voice frame!\n");
00205       return -1;
00206    }
00207    if (!s->format) {
00208       s->format = f->subclass;
00209       s->samplesperbyte = (float)f->samples / (float)f->datalen;
00210    } else if (s->format != f->subclass) {
00211       ast_log(LOG_WARNING, "Smoother was working on %d format frames, now trying to feed %d?\n", s->format, f->subclass);
00212       return -1;
00213    }
00214    if (s->len + f->datalen > SMOOTHER_SIZE) {
00215       ast_log(LOG_WARNING, "Out of smoother space\n");
00216       return -1;
00217    }
00218    if (((f->datalen == s->size) ||
00219         ((f->datalen < 10) && (s->flags & AST_SMOOTHER_FLAG_G729))) &&
00220        !s->opt &&
00221        !s->len &&
00222        (f->offset >= AST_MIN_OFFSET)) {
00223       /* Optimize by sending the frame we just got
00224          on the next read, thus eliminating the douple
00225          copy */
00226       if (swap)
00227          ast_swapcopy_samples(f->data.ptr, f->data.ptr, f->samples);
00228       s->opt = f;
00229       s->opt_needs_swap = swap ? 1 : 0;
00230       return 0;
00231    }
00232 
00233    return smoother_frame_feed(s, f, swap);
00234 }
00235 
00236 struct ast_frame *ast_smoother_read(struct ast_smoother *s)
00237 {
00238    struct ast_frame *opt;
00239    int len;
00240 
00241    /* IF we have an optimization frame, send it */
00242    if (s->opt) {
00243       if (s->opt->offset < AST_FRIENDLY_OFFSET)
00244          ast_log(LOG_WARNING, "Returning a frame of inappropriate offset (%d).\n",
00245                      s->opt->offset);
00246       opt = s->opt;
00247       s->opt = NULL;
00248       return opt;
00249    }
00250 
00251    /* Make sure we have enough data */
00252    if (s->len < s->size) {
00253       /* Or, if this is a G.729 frame with VAD on it, send it immediately anyway */
00254       if (!((s->flags & AST_SMOOTHER_FLAG_G729) && (s->len % 10)))
00255          return NULL;
00256    }
00257    len = s->size;
00258    if (len > s->len)
00259       len = s->len;
00260    /* Make frame */
00261    s->f.frametype = AST_FRAME_VOICE;
00262    s->f.subclass = s->format;
00263    s->f.data.ptr = s->framedata + AST_FRIENDLY_OFFSET;
00264    s->f.offset = AST_FRIENDLY_OFFSET;
00265    s->f.datalen = len;
00266    /* Samples will be improper given VAD, but with VAD the concept really doesn't even exist */
00267    s->f.samples = len * s->samplesperbyte;   /* XXX rounding */
00268    s->f.delivery = s->delivery;
00269    /* Fill Data */
00270    memcpy(s->f.data.ptr, s->data, len);
00271    s->len -= len;
00272    /* Move remaining data to the front if applicable */
00273    if (s->len) {
00274       /* In principle this should all be fine because if we are sending
00275          G.729 VAD, the next timestamp will take over anyawy */
00276       memmove(s->data, s->data + len, s->len);
00277       if (!ast_tvzero(s->delivery)) {
00278          /* If we have delivery time, increment it, otherwise, leave it at 0 */
00279          s->delivery = ast_tvadd(s->delivery, ast_samp2tv(s->f.samples, ast_format_rate(s->format)));
00280       }
00281    }
00282    /* Return frame */
00283    return &s->f;
00284 }
00285 
00286 void ast_smoother_free(struct ast_smoother *s)
00287 {
00288    ast_free(s);
00289 }
00290 
00291 static struct ast_frame *ast_frame_header_new(void)
00292 {
00293    struct ast_frame *f;
00294 
00295 #if !defined(LOW_MEMORY)
00296    struct ast_frame_cache *frames;
00297 
00298    if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames)))) {
00299       if ((f = AST_LIST_REMOVE_HEAD(&frames->list, frame_list))) {
00300          size_t mallocd_len = f->mallocd_hdr_len;
00301          memset(f, 0, sizeof(*f));
00302          f->mallocd_hdr_len = mallocd_len;
00303          f->mallocd = AST_MALLOCD_HDR;
00304          frames->size--;
00305          return f;
00306       }
00307    }
00308    if (!(f = ast_calloc_cache(1, sizeof(*f))))
00309       return NULL;
00310 #else
00311    if (!(f = ast_calloc(1, sizeof(*f))))
00312       return NULL;
00313 #endif
00314 
00315    f->mallocd_hdr_len = sizeof(*f);
00316    
00317    return f;
00318 }
00319 
00320 #if !defined(LOW_MEMORY)
00321 static void frame_cache_cleanup(void *data)
00322 {
00323    struct ast_frame_cache *frames = data;
00324    struct ast_frame *f;
00325 
00326    while ((f = AST_LIST_REMOVE_HEAD(&frames->list, frame_list)))
00327       ast_free(f);
00328    
00329    ast_free(frames);
00330 }
00331 #endif
00332 
00333 static void __frame_free(struct ast_frame *fr, int cache)
00334 {
00335    if (ast_test_flag(fr, AST_FRFLAG_FROM_TRANSLATOR)) {
00336       ast_translate_frame_freed(fr);
00337    } else if (ast_test_flag(fr, AST_FRFLAG_FROM_DSP)) {
00338       ast_dsp_frame_freed(fr);
00339    }
00340 
00341    if (!fr->mallocd)
00342       return;
00343 
00344 #if !defined(LOW_MEMORY)
00345    if (cache && fr->mallocd == AST_MALLOCD_HDR) {
00346       /* Cool, only the header is malloc'd, let's just cache those for now 
00347        * to keep things simple... */
00348       struct ast_frame_cache *frames;
00349 
00350       if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames))) &&
00351           (frames->size < FRAME_CACHE_MAX_SIZE)) {
00352          AST_LIST_INSERT_HEAD(&frames->list, fr, frame_list);
00353          frames->size++;
00354          return;
00355       }
00356    }
00357 #endif
00358    
00359    if (fr->mallocd & AST_MALLOCD_DATA) {
00360       if (fr->data.ptr) 
00361          ast_free(fr->data.ptr - fr->offset);
00362    }
00363    if (fr->mallocd & AST_MALLOCD_SRC) {
00364       if (fr->src)
00365          ast_free((void *) fr->src);
00366    }
00367    if (fr->mallocd & AST_MALLOCD_HDR) {
00368       ast_free(fr);
00369    }
00370 }
00371 
00372 
00373 void ast_frame_free(struct ast_frame *frame, int cache)
00374 {
00375    struct ast_frame *next;
00376 
00377    for (next = AST_LIST_NEXT(frame, frame_list);
00378         frame;
00379         frame = next, next = frame ? AST_LIST_NEXT(frame, frame_list) : NULL) {
00380       __frame_free(frame, cache);
00381    }
00382 }
00383 
00384 /*!
00385  * \brief 'isolates' a frame by duplicating non-malloc'ed components
00386  * (header, src, data).
00387  * On return all components are malloc'ed
00388  */
00389 struct ast_frame *ast_frisolate(struct ast_frame *fr)
00390 {
00391    struct ast_frame *out;
00392    void *newdata;
00393 
00394    /* if none of the existing frame is malloc'd, let ast_frdup() do it
00395       since it is more efficient
00396    */
00397    if (fr->mallocd == 0) {
00398       return ast_frdup(fr);
00399    }
00400 
00401    /* if everything is already malloc'd, we are done */
00402    if ((fr->mallocd & (AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA)) ==
00403        (AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA)) {
00404       return fr;
00405    }
00406 
00407    if (!(fr->mallocd & AST_MALLOCD_HDR)) {
00408       /* Allocate a new header if needed */
00409       if (!(out = ast_frame_header_new())) {
00410          return NULL;
00411       }
00412       out->frametype = fr->frametype;
00413       out->subclass = fr->subclass;
00414       out->datalen = fr->datalen;
00415       out->samples = fr->samples;
00416       out->offset = fr->offset;
00417       /* Copy the timing data */
00418       ast_copy_flags(out, fr, AST_FRFLAG_HAS_TIMING_INFO);
00419       if (ast_test_flag(fr, AST_FRFLAG_HAS_TIMING_INFO)) {
00420          out->ts = fr->ts;
00421          out->len = fr->len;
00422          out->seqno = fr->seqno;
00423       }
00424    } else {
00425       ast_clear_flag(fr, AST_FRFLAG_FROM_TRANSLATOR);
00426       ast_clear_flag(fr, AST_FRFLAG_FROM_DSP);
00427       out = fr;
00428    }
00429    
00430    if (!(fr->mallocd & AST_MALLOCD_SRC) && fr->src) {
00431       if (!(out->src = ast_strdup(fr->src))) {
00432          if (out != fr) {
00433             ast_free(out);
00434          }
00435          return NULL;
00436       }
00437    } else {
00438       out->src = fr->src;
00439       fr->src = NULL;
00440       fr->mallocd &= ~AST_MALLOCD_SRC;
00441    }
00442    
00443    if (!(fr->mallocd & AST_MALLOCD_DATA))  {
00444       if (!fr->datalen) {
00445          out->data.uint32 = fr->data.uint32;
00446          out->mallocd = AST_MALLOCD_HDR | AST_MALLOCD_SRC;
00447          return out;
00448       }
00449       if (!(newdata = ast_malloc(fr->datalen + AST_FRIENDLY_OFFSET))) {
00450          if (out->src != fr->src) {
00451             ast_free((void *) out->src);
00452          }
00453          if (out != fr) {
00454             ast_free(out);
00455          }
00456          return NULL;
00457       }
00458       newdata += AST_FRIENDLY_OFFSET;
00459       out->offset = AST_FRIENDLY_OFFSET;
00460       out->datalen = fr->datalen;
00461       memcpy(newdata, fr->data.ptr, fr->datalen);
00462       out->data.ptr = newdata;
00463    } else {
00464       out->data = fr->data;
00465       memset(&fr->data, 0, sizeof(fr->data));
00466       fr->mallocd &= ~AST_MALLOCD_DATA;
00467    }
00468 
00469    out->mallocd = AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA;
00470    
00471    return out;
00472 }
00473 
00474 struct ast_frame *ast_frdup(const struct ast_frame *f)
00475 {
00476    struct ast_frame *out = NULL;
00477    int len, srclen = 0;
00478    void *buf = NULL;
00479 
00480 #if !defined(LOW_MEMORY)
00481    struct ast_frame_cache *frames;
00482 #endif
00483 
00484    /* Start with standard stuff */
00485    len = sizeof(*out) + AST_FRIENDLY_OFFSET + f->datalen;
00486    /* If we have a source, add space for it */
00487    /*
00488     * XXX Watch out here - if we receive a src which is not terminated
00489     * properly, we can be easily attacked. Should limit the size we deal with.
00490     */
00491    if (f->src)
00492       srclen = strlen(f->src);
00493    if (srclen > 0)
00494       len += srclen + 1;
00495    
00496 #if !defined(LOW_MEMORY)
00497    if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames)))) {
00498       AST_LIST_TRAVERSE_SAFE_BEGIN(&frames->list, out, frame_list) {
00499          if (out->mallocd_hdr_len >= len) {
00500             size_t mallocd_len = out->mallocd_hdr_len;
00501 
00502             AST_LIST_REMOVE_CURRENT(frame_list);
00503             memset(out, 0, sizeof(*out));
00504             out->mallocd_hdr_len = mallocd_len;
00505             buf = out;
00506             frames->size--;
00507             break;
00508          }
00509       }
00510       AST_LIST_TRAVERSE_SAFE_END;
00511    }
00512 #endif
00513 
00514    if (!buf) {
00515       if (!(buf = ast_calloc_cache(1, len)))
00516          return NULL;
00517       out = buf;
00518       out->mallocd_hdr_len = len;
00519    }
00520 
00521    out->frametype = f->frametype;
00522    out->subclass = f->subclass;
00523    out->datalen = f->datalen;
00524    out->samples = f->samples;
00525    out->delivery = f->delivery;
00526    /* Set us as having malloc'd header only, so it will eventually
00527       get freed. */
00528    out->mallocd = AST_MALLOCD_HDR;
00529    out->offset = AST_FRIENDLY_OFFSET;
00530    if (out->datalen) {
00531       out->data.ptr = buf + sizeof(*out) + AST_FRIENDLY_OFFSET;
00532       memcpy(out->data.ptr, f->data.ptr, out->datalen);  
00533    } else {
00534       out->data.uint32 = f->data.uint32;
00535    }
00536    if (srclen > 0) {
00537       /* This may seem a little strange, but it's to avoid a gcc (4.2.4) compiler warning */
00538       char *src;
00539       out->src = buf + sizeof(*out) + AST_FRIENDLY_OFFSET + f->datalen;
00540       src = (char *) out->src;
00541       /* Must have space since we allocated for it */
00542       strcpy(src, f->src);
00543    }
00544    ast_copy_flags(out, f, AST_FRFLAG_HAS_TIMING_INFO);
00545    out->ts = f->ts;
00546    out->len = f->len;
00547    out->seqno = f->seqno;
00548    return out;
00549 }
00550 
00551 void ast_swapcopy_samples(void *dst, const void *src, int samples)
00552 {
00553    int i;
00554    unsigned short *dst_s = dst;
00555    const unsigned short *src_s = src;
00556 
00557    for (i = 0; i < samples; i++)
00558       dst_s[i] = (src_s[i]<<8) | (src_s[i]>>8);
00559 }
00560 
00561 
00562 const struct ast_format_list *ast_get_format_list_index(int idx) 
00563 {
00564    return &AST_FORMAT_LIST[idx];
00565 }
00566 
00567 const struct ast_format_list *ast_get_format_list(size_t *size) 
00568 {
00569    *size = ARRAY_LEN(AST_FORMAT_LIST);
00570    return AST_FORMAT_LIST;
00571 }
00572 
00573 char* ast_getformatname(int format)
00574 {
00575    int x;
00576    char *ret = "unknown";
00577    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00578       if (AST_FORMAT_LIST[x].bits == format) {
00579          ret = AST_FORMAT_LIST[x].name;
00580          break;
00581       }
00582    }
00583    return ret;
00584 }
00585 
00586 char *ast_getformatname_multiple(char *buf, size_t size, int format)
00587 {
00588    int x;
00589    unsigned len;
00590    char *start, *end = buf;
00591 
00592    if (!size)
00593       return buf;
00594    snprintf(end, size, "0x%x (", format);
00595    len = strlen(end);
00596    end += len;
00597    size -= len;
00598    start = end;
00599    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00600       if (AST_FORMAT_LIST[x].bits & format) {
00601          snprintf(end, size,"%s|",AST_FORMAT_LIST[x].name);
00602          len = strlen(end);
00603          end += len;
00604          size -= len;
00605       }
00606    }
00607    if (start == end)
00608       ast_copy_string(start, "nothing)", size);
00609    else if (size > 1)
00610       *(end -1) = ')';
00611    return buf;
00612 }
00613 
00614 static struct ast_codec_alias_table {
00615    char *alias;
00616    char *realname;
00617 } ast_codec_alias_table[] = {
00618    { "slinear", "slin"},
00619    { "slinear16", "slin16"},
00620    { "g723.1", "g723"},
00621    { "g722.1", "siren7"},
00622    { "g722.1c", "siren14"},
00623 };
00624 
00625 static const char *ast_expand_codec_alias(const char *in)
00626 {
00627    int x;
00628 
00629    for (x = 0; x < ARRAY_LEN(ast_codec_alias_table); x++) {
00630       if (!strcmp(in,ast_codec_alias_table[x].alias))
00631          return ast_codec_alias_table[x].realname;
00632    }
00633    return in;
00634 }
00635 
00636 int ast_getformatbyname(const char *name)
00637 {
00638    int x, all, format = 0;
00639 
00640    all = strcasecmp(name, "all") ? 0 : 1;
00641    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00642       if (all || 
00643            !strcasecmp(AST_FORMAT_LIST[x].name,name) ||
00644            !strcasecmp(AST_FORMAT_LIST[x].name, ast_expand_codec_alias(name))) {
00645          format |= AST_FORMAT_LIST[x].bits;
00646          if (!all)
00647             break;
00648       }
00649    }
00650 
00651    return format;
00652 }
00653 
00654 char *ast_codec2str(int codec)
00655 {
00656    int x;
00657    char *ret = "unknown";
00658    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00659       if (AST_FORMAT_LIST[x].bits == codec) {
00660          ret = AST_FORMAT_LIST[x].desc;
00661          break;
00662       }
00663    }
00664    return ret;
00665 }
00666 
00667 static char *show_codecs(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00668 {
00669    int i, found=0;
00670    char hex[25];
00671 
00672    switch (cmd) {
00673    case CLI_INIT:
00674       e->command = "core show codecs [audio|video|image]";
00675       e->usage = 
00676          "Usage: core show codecs [audio|video|image]\n"
00677          "       Displays codec mapping\n";
00678       return NULL;
00679    case CLI_GENERATE:
00680       return NULL;
00681    }
00682    
00683    if ((a->argc < 3) || (a->argc > 4))
00684       return CLI_SHOWUSAGE;
00685 
00686    if (!ast_opt_dont_warn)
00687       ast_cli(a->fd, "Disclaimer: this command is for informational purposes only.\n"
00688             "\tIt does not indicate anything about your configuration.\n");
00689 
00690    ast_cli(a->fd, "%11s %9s %10s   TYPE   %8s   %s\n","INT","BINARY","HEX","NAME","DESC");
00691    ast_cli(a->fd, "--------------------------------------------------------------------------------\n");
00692    if ((a->argc == 3) || (!strcasecmp(a->argv[3],"audio"))) {
00693       found = 1;
00694       for (i=0;i<13;i++) {
00695          snprintf(hex,25,"(0x%x)",1<<i);
00696          ast_cli(a->fd, "%11u (1 << %2d) %10s  audio   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00697       }
00698    }
00699 
00700    if ((a->argc == 3) || (!strcasecmp(a->argv[3],"image"))) {
00701       found = 1;
00702       for (i=16;i<18;i++) {
00703          snprintf(hex,25,"(0x%x)",1<<i);
00704          ast_cli(a->fd, "%11u (1 << %2d) %10s  image   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00705       }
00706    }
00707 
00708    if ((a->argc == 3) || (!strcasecmp(a->argv[3],"video"))) {
00709       found = 1;
00710       for (i=18;i<22;i++) {
00711          snprintf(hex,25,"(0x%x)",1<<i);
00712          ast_cli(a->fd, "%11u (1 << %2d) %10s  video   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00713       }
00714    }
00715 
00716    if (!found)
00717       return CLI_SHOWUSAGE;
00718    else
00719       return CLI_SUCCESS;
00720 }
00721 
00722 static char *show_codec_n(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00723 {
00724    int codec, i, found=0;
00725 
00726    switch (cmd) {
00727    case CLI_INIT:
00728       e->command = "core show codec";
00729       e->usage = 
00730          "Usage: core show codec <number>\n"
00731          "       Displays codec mapping\n";
00732       return NULL;
00733    case CLI_GENERATE:
00734       return NULL;
00735    }
00736 
00737    if (a->argc != 4)
00738       return CLI_SHOWUSAGE;
00739 
00740    if (sscanf(a->argv[3], "%30d", &codec) != 1)
00741       return CLI_SHOWUSAGE;
00742 
00743    for (i = 0; i < 32; i++)
00744       if (codec & (1 << i)) {
00745          found = 1;
00746          ast_cli(a->fd, "%11u (1 << %2d)  %s\n",1 << i,i,ast_codec2str(1<<i));
00747       }
00748 
00749    if (!found)
00750       ast_cli(a->fd, "Codec %d not found\n", codec);
00751 
00752    return CLI_SUCCESS;
00753 }
00754 
00755 /*! Dump a frame for debugging purposes */
00756 void ast_frame_dump(const char *name, struct ast_frame *f, char *prefix)
00757 {
00758    const char noname[] = "unknown";
00759    char ftype[40] = "Unknown Frametype";
00760    char cft[80];
00761    char subclass[40] = "Unknown Subclass";
00762    char csub[80];
00763    char moreinfo[40] = "";
00764    char cn[60];
00765    char cp[40];
00766    char cmn[40];
00767    const char *message = "Unknown";
00768 
00769    if (!name)
00770       name = noname;
00771 
00772 
00773    if (!f) {
00774       ast_verbose("%s [ %s (NULL) ] [%s]\n", 
00775          term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00776          term_color(cft, "HANGUP", COLOR_BRRED, COLOR_BLACK, sizeof(cft)), 
00777          term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00778       return;
00779    }
00780    /* XXX We should probably print one each of voice and video when the format changes XXX */
00781    if (f->frametype == AST_FRAME_VOICE)
00782       return;
00783    if (f->frametype == AST_FRAME_VIDEO)
00784       return;
00785    switch(f->frametype) {
00786    case AST_FRAME_DTMF_BEGIN:
00787       strcpy(ftype, "DTMF Begin");
00788       subclass[0] = f->subclass;
00789       subclass[1] = '\0';
00790       break;
00791    case AST_FRAME_DTMF_END:
00792       strcpy(ftype, "DTMF End");
00793       subclass[0] = f->subclass;
00794       subclass[1] = '\0';
00795       break;
00796    case AST_FRAME_CONTROL:
00797       strcpy(ftype, "Control");
00798       switch(f->subclass) {
00799       case AST_CONTROL_HANGUP:
00800          strcpy(subclass, "Hangup");
00801          break;
00802       case AST_CONTROL_RING:
00803          strcpy(subclass, "Ring");
00804          break;
00805       case AST_CONTROL_RINGING:
00806          strcpy(subclass, "Ringing");
00807          break;
00808       case AST_CONTROL_ANSWER:
00809          strcpy(subclass, "Answer");
00810          break;
00811       case AST_CONTROL_BUSY:
00812          strcpy(subclass, "Busy");
00813          break;
00814       case AST_CONTROL_TAKEOFFHOOK:
00815          strcpy(subclass, "Take Off Hook");
00816          break;
00817       case AST_CONTROL_OFFHOOK:
00818          strcpy(subclass, "Line Off Hook");
00819          break;
00820       case AST_CONTROL_CONGESTION:
00821          strcpy(subclass, "Congestion");
00822          break;
00823       case AST_CONTROL_FLASH:
00824          strcpy(subclass, "Flash");
00825          break;
00826       case AST_CONTROL_WINK:
00827          strcpy(subclass, "Wink");
00828          break;
00829       case AST_CONTROL_OPTION:
00830          strcpy(subclass, "Option");
00831          break;
00832       case AST_CONTROL_RADIO_KEY:
00833          strcpy(subclass, "Key Radio");
00834          break;
00835       case AST_CONTROL_RADIO_UNKEY:
00836          strcpy(subclass, "Unkey Radio");
00837          break;
00838       case AST_CONTROL_HOLD:
00839          strcpy(subclass, "Hold");
00840          break;
00841       case AST_CONTROL_UNHOLD:
00842          strcpy(subclass, "Unhold");
00843          break;
00844       case AST_CONTROL_T38_PARAMETERS:
00845          if (f->datalen != sizeof(struct ast_control_t38_parameters)) {
00846             message = "Invalid";
00847          } else {
00848             struct ast_control_t38_parameters *parameters = f->data.ptr;
00849             enum ast_control_t38 state = parameters->request_response;
00850             if (state == AST_T38_REQUEST_NEGOTIATE)
00851                message = "Negotiation Requested";
00852             else if (state == AST_T38_REQUEST_TERMINATE)
00853                message = "Negotiation Request Terminated";
00854             else if (state == AST_T38_NEGOTIATED)
00855                message = "Negotiated";
00856             else if (state == AST_T38_TERMINATED)
00857                message = "Terminated";
00858             else if (state == AST_T38_REFUSED)
00859                message = "Refused";
00860          }
00861          snprintf(subclass, sizeof(subclass), "T38_Parameters/%s", message);
00862          break;
00863       case -1:
00864          strcpy(subclass, "Stop generators");
00865          break;
00866       default:
00867          snprintf(subclass, sizeof(subclass), "Unknown control '%d'", f->subclass);
00868       }
00869       break;
00870    case AST_FRAME_NULL:
00871       strcpy(ftype, "Null Frame");
00872       strcpy(subclass, "N/A");
00873       break;
00874    case AST_FRAME_IAX:
00875       /* Should never happen */
00876       strcpy(ftype, "IAX Specific");
00877       snprintf(subclass, sizeof(subclass), "IAX Frametype %d", f->subclass);
00878       break;
00879    case AST_FRAME_TEXT:
00880       strcpy(ftype, "Text");
00881       strcpy(subclass, "N/A");
00882       ast_copy_string(moreinfo, f->data.ptr, sizeof(moreinfo));
00883       break;
00884    case AST_FRAME_IMAGE:
00885       strcpy(ftype, "Image");
00886       snprintf(subclass, sizeof(subclass), "Image format %s\n", ast_getformatname(f->subclass));
00887       break;
00888    case AST_FRAME_HTML:
00889       strcpy(ftype, "HTML");
00890       switch(f->subclass) {
00891       case AST_HTML_URL:
00892          strcpy(subclass, "URL");
00893          ast_copy_string(moreinfo, f->data.ptr, sizeof(moreinfo));
00894          break;
00895       case AST_HTML_DATA:
00896          strcpy(subclass, "Data");
00897          break;
00898       case AST_HTML_BEGIN:
00899          strcpy(subclass, "Begin");
00900          break;
00901       case AST_HTML_END:
00902          strcpy(subclass, "End");
00903          break;
00904       case AST_HTML_LDCOMPLETE:
00905          strcpy(subclass, "Load Complete");
00906          break;
00907       case AST_HTML_NOSUPPORT:
00908          strcpy(subclass, "No Support");
00909          break;
00910       case AST_HTML_LINKURL:
00911          strcpy(subclass, "Link URL");
00912          ast_copy_string(moreinfo, f->data.ptr, sizeof(moreinfo));
00913          break;
00914       case AST_HTML_UNLINK:
00915          strcpy(subclass, "Unlink");
00916          break;
00917       case AST_HTML_LINKREJECT:
00918          strcpy(subclass, "Link Reject");
00919          break;
00920       default:
00921          snprintf(subclass, sizeof(subclass), "Unknown HTML frame '%d'\n", f->subclass);
00922          break;
00923       }
00924       break;
00925    case AST_FRAME_MODEM:
00926       strcpy(ftype, "Modem");
00927       switch (f->subclass) {
00928       case AST_MODEM_T38:
00929          strcpy(subclass, "T.38");
00930          break;
00931       case AST_MODEM_V150:
00932          strcpy(subclass, "V.150");
00933          break;
00934       default:
00935          snprintf(subclass, sizeof(subclass), "Unknown MODEM frame '%d'\n", f->subclass);
00936          break;
00937       }
00938       break;
00939    default:
00940       snprintf(ftype, sizeof(ftype), "Unknown Frametype '%d'", f->frametype);
00941    }
00942    if (!ast_strlen_zero(moreinfo))
00943       ast_verbose("%s [ TYPE: %s (%d) SUBCLASS: %s (%d) '%s' ] [%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(cmn, moreinfo, COLOR_BRGREEN, COLOR_BLACK, sizeof(cmn)),
00950              term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00951    else
00952       ast_verbose("%s [ TYPE: %s (%d) SUBCLASS: %s (%d) ] [%s]\n",  
00953              term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00954              term_color(cft, ftype, COLOR_BRRED, COLOR_BLACK, sizeof(cft)),
00955              f->frametype, 
00956              term_color(csub, subclass, COLOR_BRCYAN, COLOR_BLACK, sizeof(csub)),
00957              f->subclass, 
00958              term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00959 }
00960 
00961 
00962 /* Builtin Asterisk CLI-commands for debugging */
00963 static struct ast_cli_entry my_clis[] = {
00964    AST_CLI_DEFINE(show_codecs, "Displays a list of codecs"),
00965    AST_CLI_DEFINE(show_codec_n, "Shows a specific codec"),
00966 };
00967 
00968 int init_framer(void)
00969 {
00970    ast_cli_register_multiple(my_clis, ARRAY_LEN(my_clis));
00971    return 0;   
00972 }
00973 
00974 void ast_codec_pref_convert(struct ast_codec_pref *pref, char *buf, size_t size, int right) 
00975 {
00976    int x, differential = (int) 'A', mem;
00977    char *from, *to;
00978 
00979    if (right) {
00980       from = pref->order;
00981       to = buf;
00982       mem = size;
00983    } else {
00984       to = pref->order;
00985       from = buf;
00986       mem = 32;
00987    }
00988 
00989    memset(to, 0, mem);
00990    for (x = 0; x < 32 ; x++) {
00991       if (!from[x])
00992          break;
00993       to[x] = right ? (from[x] + differential) : (from[x] - differential);
00994    }
00995 }
00996 
00997 int ast_codec_pref_string(struct ast_codec_pref *pref, char *buf, size_t size) 
00998 {
00999    int x, codec; 
01000    size_t total_len, slen;
01001    char *formatname;
01002    
01003    memset(buf,0,size);
01004    total_len = size;
01005    buf[0] = '(';
01006    total_len--;
01007    for(x = 0; x < 32 ; x++) {
01008       if (total_len <= 0)
01009          break;
01010       if (!(codec = ast_codec_pref_index(pref,x)))
01011          break;
01012       if ((formatname = ast_getformatname(codec))) {
01013          slen = strlen(formatname);
01014          if (slen > total_len)
01015             break;
01016          strncat(buf, formatname, total_len - 1); /* safe */
01017          total_len -= slen;
01018       }
01019       if (total_len && x < 31 && ast_codec_pref_index(pref , x + 1)) {
01020          strncat(buf, "|", total_len - 1); /* safe */
01021          total_len--;
01022       }
01023    }
01024    if (total_len) {
01025       strncat(buf, ")", total_len - 1); /* safe */
01026       total_len--;
01027    }
01028 
01029    return size - total_len;
01030 }
01031 
01032 int ast_codec_pref_index(struct ast_codec_pref *pref, int idx)
01033 {
01034    int slot = 0;
01035 
01036    if ((idx >= 0) && (idx < sizeof(pref->order))) {
01037       slot = pref->order[idx];
01038    }
01039 
01040    return slot ? AST_FORMAT_LIST[slot - 1].bits : 0;
01041 }
01042 
01043 /*! \brief Remove codec from pref list */
01044 void ast_codec_pref_remove(struct ast_codec_pref *pref, int format)
01045 {
01046    struct ast_codec_pref oldorder;
01047    int x, y = 0;
01048    int slot;
01049    int size;
01050 
01051    if (!pref->order[0])
01052       return;
01053 
01054    memcpy(&oldorder, pref, sizeof(oldorder));
01055    memset(pref, 0, sizeof(*pref));
01056 
01057    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01058       slot = oldorder.order[x];
01059       size = oldorder.framing[x];
01060       if (! slot)
01061          break;
01062       if (AST_FORMAT_LIST[slot-1].bits != format) {
01063          pref->order[y] = slot;
01064          pref->framing[y++] = size;
01065       }
01066    }
01067    
01068 }
01069 
01070 /*! \brief Append codec to list */
01071 int ast_codec_pref_append(struct ast_codec_pref *pref, int format)
01072 {
01073    int x, newindex = 0;
01074 
01075    ast_codec_pref_remove(pref, format);
01076 
01077    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01078       if (AST_FORMAT_LIST[x].bits == format) {
01079          newindex = x + 1;
01080          break;
01081       }
01082    }
01083 
01084    if (newindex) {
01085       for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01086          if (!pref->order[x]) {
01087             pref->order[x] = newindex;
01088             break;
01089          }
01090       }
01091    }
01092 
01093    return x;
01094 }
01095 
01096 /*! \brief Prepend codec to list */
01097 void ast_codec_pref_prepend(struct ast_codec_pref *pref, int format, int only_if_existing)
01098 {
01099    int x, newindex = 0;
01100 
01101    /* First step is to get the codecs "index number" */
01102    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01103       if (AST_FORMAT_LIST[x].bits == format) {
01104          newindex = x + 1;
01105          break;
01106       }
01107    }
01108    /* Done if its unknown */
01109    if (!newindex)
01110       return;
01111 
01112    /* Now find any existing occurrence, or the end */
01113    for (x = 0; x < 32; x++) {
01114       if (!pref->order[x] || pref->order[x] == newindex)
01115          break;
01116    }
01117 
01118    if (only_if_existing && !pref->order[x])
01119       return;
01120 
01121    /* Move down to make space to insert - either all the way to the end,
01122       or as far as the existing location (which will be overwritten) */
01123    for (; x > 0; x--) {
01124       pref->order[x] = pref->order[x - 1];
01125       pref->framing[x] = pref->framing[x - 1];
01126    }
01127 
01128    /* And insert the new entry */
01129    pref->order[0] = newindex;
01130    pref->framing[0] = 0; /* ? */
01131 }
01132 
01133 /*! \brief Set packet size for codec */
01134 int ast_codec_pref_setsize(struct ast_codec_pref *pref, int format, int framems)
01135 {
01136    int x, idx = -1;
01137 
01138    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01139       if (AST_FORMAT_LIST[x].bits == format) {
01140          idx = x;
01141          break;
01142       }
01143    }
01144 
01145    if (idx < 0)
01146       return -1;
01147 
01148    /* size validation */
01149    if (!framems)
01150       framems = AST_FORMAT_LIST[idx].def_ms;
01151 
01152    if (AST_FORMAT_LIST[idx].inc_ms && framems % AST_FORMAT_LIST[idx].inc_ms) /* avoid division by zero */
01153       framems -= framems % AST_FORMAT_LIST[idx].inc_ms;
01154 
01155    if (framems < AST_FORMAT_LIST[idx].min_ms)
01156       framems = AST_FORMAT_LIST[idx].min_ms;
01157 
01158    if (framems > AST_FORMAT_LIST[idx].max_ms)
01159       framems = AST_FORMAT_LIST[idx].max_ms;
01160 
01161    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01162       if (pref->order[x] == (idx + 1)) {
01163          pref->framing[x] = framems;
01164          break;
01165       }
01166    }
01167 
01168    return x;
01169 }
01170 
01171 /*! \brief Get packet size for codec */
01172 struct ast_format_list ast_codec_pref_getsize(struct ast_codec_pref *pref, int format)
01173 {
01174    int x, idx = -1, framems = 0;
01175    struct ast_format_list fmt = { 0, };
01176 
01177    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01178       if (AST_FORMAT_LIST[x].bits == format) {
01179          fmt = AST_FORMAT_LIST[x];
01180          idx = x;
01181          break;
01182       }
01183    }
01184 
01185    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01186       if (pref->order[x] == (idx + 1)) {
01187          framems = pref->framing[x];
01188          break;
01189       }
01190    }
01191 
01192    /* size validation */
01193    if (!framems)
01194       framems = AST_FORMAT_LIST[idx].def_ms;
01195 
01196    if (AST_FORMAT_LIST[idx].inc_ms && framems % AST_FORMAT_LIST[idx].inc_ms) /* avoid division by zero */
01197       framems -= framems % AST_FORMAT_LIST[idx].inc_ms;
01198 
01199    if (framems < AST_FORMAT_LIST[idx].min_ms)
01200       framems = AST_FORMAT_LIST[idx].min_ms;
01201 
01202    if (framems > AST_FORMAT_LIST[idx].max_ms)
01203       framems = AST_FORMAT_LIST[idx].max_ms;
01204 
01205    fmt.cur_ms = framems;
01206 
01207    return fmt;
01208 }
01209 
01210 /*! \brief Pick a codec */
01211 int ast_codec_choose(struct ast_codec_pref *pref, int formats, int find_best)
01212 {
01213    int x, ret = 0, slot;
01214 
01215    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01216       slot = pref->order[x];
01217 
01218       if (!slot)
01219          break;
01220       if (formats & AST_FORMAT_LIST[slot-1].bits) {
01221          ret = AST_FORMAT_LIST[slot-1].bits;
01222          break;
01223       }
01224    }
01225    if (ret & AST_FORMAT_AUDIO_MASK)
01226       return ret;
01227 
01228    ast_debug(4, "Could not find preferred codec - %s\n", find_best ? "Going for the best codec" : "Returning zero codec");
01229 
01230       return find_best ? ast_best_codec(formats) : 0;
01231 }
01232 
01233 int ast_parse_allow_disallow(struct ast_codec_pref *pref, int *mask, const char *list, int allowing) 
01234 {
01235    int errors = 0;
01236    char *parse = NULL, *this = NULL, *psize = NULL;
01237    int format = 0, framems = 0;
01238 
01239    parse = ast_strdupa(list);
01240    while ((this = strsep(&parse, ","))) {
01241       framems = 0;
01242       if ((psize = strrchr(this, ':'))) {
01243          *psize++ = '\0';
01244          ast_debug(1, "Packetization for codec: %s is %s\n", this, psize);
01245          framems = atoi(psize);
01246          if (framems < 0) {
01247             framems = 0;
01248             errors++;
01249             ast_log(LOG_WARNING, "Bad packetization value for codec %s\n", this);
01250          }
01251       }
01252       if (!(format = ast_getformatbyname(this))) {
01253          ast_log(LOG_WARNING, "Cannot %s unknown format '%s'\n", allowing ? "allow" : "disallow", this);
01254          errors++;
01255          continue;
01256       }
01257 
01258       if (mask) {
01259          if (allowing)
01260             *mask |= format;
01261          else
01262             *mask &= ~format;
01263       }
01264 
01265       /* Set up a preference list for audio. Do not include video in preferences 
01266          since we can not transcode video and have to use whatever is offered
01267        */
01268       if (pref && (format & AST_FORMAT_AUDIO_MASK)) {
01269          if (strcasecmp(this, "all")) {
01270             if (allowing) {
01271                ast_codec_pref_append(pref, format);
01272                ast_codec_pref_setsize(pref, format, framems);
01273             }
01274             else
01275                ast_codec_pref_remove(pref, format);
01276          } else if (!allowing) {
01277             memset(pref, 0, sizeof(*pref));
01278          }
01279       }
01280    }
01281    return errors;
01282 }
01283 
01284 static int g723_len(unsigned char buf)
01285 {
01286    enum frame_type type = buf & TYPE_MASK;
01287 
01288    switch(type) {
01289    case TYPE_DONTSEND:
01290       return 0;
01291       break;
01292    case TYPE_SILENCE:
01293       return 4;
01294       break;
01295    case TYPE_HIGH:
01296       return 24;
01297       break;
01298    case TYPE_LOW:
01299       return 20;
01300       break;
01301    default:
01302       ast_log(LOG_WARNING, "Badly encoded frame (%d)\n", type);
01303    }
01304    return -1;
01305 }
01306 
01307 static int g723_samples(unsigned char *buf, int maxlen)
01308 {
01309    int pos = 0;
01310    int samples = 0;
01311    int res;
01312    while(pos < maxlen) {
01313       res = g723_len(buf[pos]);
01314       if (res <= 0)
01315          break;
01316       samples += 240;
01317       pos += res;
01318    }
01319    return samples;
01320 }
01321 
01322 static unsigned char get_n_bits_at(unsigned char *data, int n, int bit)
01323 {
01324    int byte = bit / 8;       /* byte containing first bit */
01325    int rem = 8 - (bit % 8);  /* remaining bits in first byte */
01326    unsigned char ret = 0;
01327    
01328    if (n <= 0 || n > 8)
01329       return 0;
01330 
01331    if (rem < n) {
01332       ret = (data[byte] << (n - rem));
01333       ret |= (data[byte + 1] >> (8 - n + rem));
01334    } else {
01335       ret = (data[byte] >> (rem - n));
01336    }
01337 
01338    return (ret & (0xff >> (8 - n)));
01339 }
01340 
01341 static int speex_get_wb_sz_at(unsigned char *data, int len, int bit)
01342 {
01343    static int SpeexWBSubModeSz[] = {
01344       0, 36, 112, 192,
01345       352, 0, 0, 0 };
01346    int off = bit;
01347    unsigned char c;
01348 
01349    /* skip up to two wideband frames */
01350    if (((len * 8 - off) >= 5) && 
01351       get_n_bits_at(data, 1, off)) {
01352       c = get_n_bits_at(data, 3, off + 1);
01353       off += SpeexWBSubModeSz[c];
01354 
01355       if (((len * 8 - off) >= 5) && 
01356          get_n_bits_at(data, 1, off)) {
01357          c = get_n_bits_at(data, 3, off + 1);
01358          off += SpeexWBSubModeSz[c];
01359 
01360          if (((len * 8 - off) >= 5) && 
01361             get_n_bits_at(data, 1, off)) {
01362             ast_log(LOG_WARNING, "Encountered corrupt speex frame; too many wideband frames in a row.\n");
01363             return -1;
01364          }
01365       }
01366 
01367    }
01368    return off - bit;
01369 }
01370 
01371 static int speex_samples(unsigned char *data, int len)
01372 {
01373    static int SpeexSubModeSz[] = {
01374       5, 43, 119, 160,
01375       220, 300, 364, 492, 
01376       79, 0, 0, 0,
01377       0, 0, 0, 0 };
01378    static int SpeexInBandSz[] = { 
01379       1, 1, 4, 4,
01380       4, 4, 4, 4,
01381       8, 8, 16, 16,
01382       32, 32, 64, 64 };
01383    int bit = 0;
01384    int cnt = 0;
01385    int off;
01386    unsigned char c;
01387 
01388    while ((len * 8 - bit) >= 5) {
01389       /* skip wideband frames */
01390       off = speex_get_wb_sz_at(data, len, bit);
01391       if (off < 0)  {
01392          ast_log(LOG_WARNING, "Had error while reading wideband frames for speex samples\n");
01393          break;
01394       }
01395       bit += off;
01396 
01397       if ((len * 8 - bit) == 0) {
01398          break;
01399       } else if ((len * 8 - bit) < 5) {
01400          ast_log(LOG_WARNING, "Not enough bits remaining after wide band for speex samples.\n");
01401          break;
01402       }
01403 
01404       /* get control bits */
01405       c = get_n_bits_at(data, 5, bit);
01406       bit += 5;
01407 
01408       if (c == 15) { 
01409          /* terminator */
01410          break; 
01411       } else if (c == 14) {
01412          /* in-band signal; next 4 bits contain signal id */
01413          c = get_n_bits_at(data, 4, bit);
01414          bit += 4;
01415          bit += SpeexInBandSz[c];
01416       } else if (c == 13) {
01417          /* user in-band; next 5 bits contain msg len */
01418          c = get_n_bits_at(data, 5, bit);
01419          bit += 5;
01420          bit += c * 8;
01421       } else if (c > 8) {
01422          /* unknown */
01423          break;
01424       } else {
01425          /* skip number bits for submode (less the 5 control bits) */
01426          bit += SpeexSubModeSz[c] - 5;
01427          cnt += 160; /* new frame */
01428       }
01429    }
01430    return cnt;
01431 }
01432 
01433 int ast_codec_get_samples(struct ast_frame *f)
01434 {
01435    int samples = 0;
01436 
01437    switch(f->subclass) {
01438    case AST_FORMAT_SPEEX:
01439       samples = speex_samples(f->data.ptr, f->datalen);
01440       break;
01441    case AST_FORMAT_G723_1:
01442       samples = g723_samples(f->data.ptr, f->datalen);
01443       break;
01444    case AST_FORMAT_ILBC:
01445       samples = 240 * (f->datalen / 50);
01446       break;
01447    case AST_FORMAT_GSM:
01448       samples = 160 * (f->datalen / 33);
01449       break;
01450    case AST_FORMAT_G729A:
01451       samples = f->datalen * 8;
01452       break;
01453    case AST_FORMAT_SLINEAR:
01454    case AST_FORMAT_SLINEAR16:
01455       samples = f->datalen / 2;
01456       break;
01457    case AST_FORMAT_LPC10:
01458       /* assumes that the RTP packet contains one LPC10 frame */
01459       samples = 22 * 8;
01460       samples += (((char *)(f->data.ptr))[7] & 0x1) * 8;
01461       break;
01462    case AST_FORMAT_ULAW:
01463    case AST_FORMAT_ALAW:
01464       samples = f->datalen;
01465       break;
01466    case AST_FORMAT_G722:
01467    case AST_FORMAT_ADPCM:
01468    case AST_FORMAT_G726:
01469    case AST_FORMAT_G726_AAL2:
01470       samples = f->datalen * 2;
01471       break;
01472    case AST_FORMAT_SIREN7:
01473       /* 16,000 samples per second at 32kbps is 4,000 bytes per second */
01474       samples = f->datalen * (16000 / 4000);
01475       break;
01476    case AST_FORMAT_SIREN14:
01477       /* 32,000 samples per second at 48kbps is 6,000 bytes per second */
01478       samples = (int) f->datalen * ((float) 32000 / 6000);
01479       break;
01480    default:
01481       ast_log(LOG_WARNING, "Unable to calculate samples for format %s\n", ast_getformatname(f->subclass));
01482    }
01483    return samples;
01484 }
01485 
01486 int ast_codec_get_len(int format, int samples)
01487 {
01488    int len = 0;
01489 
01490    /* XXX Still need speex, and lpc10 XXX */ 
01491    switch(format) {
01492    case AST_FORMAT_G723_1:
01493       len = (samples / 240) * 20;
01494       break;
01495    case AST_FORMAT_ILBC:
01496       len = (samples / 240) * 50;
01497       break;
01498    case AST_FORMAT_GSM:
01499       len = (samples / 160) * 33;
01500       break;
01501    case AST_FORMAT_G729A:
01502       len = samples / 8;
01503       break;
01504    case AST_FORMAT_SLINEAR:
01505    case AST_FORMAT_SLINEAR16:
01506       len = samples * 2;
01507       break;
01508    case AST_FORMAT_ULAW:
01509    case AST_FORMAT_ALAW:
01510       len = samples;
01511       break;
01512    case AST_FORMAT_G722:
01513    case AST_FORMAT_ADPCM:
01514    case AST_FORMAT_G726:
01515    case AST_FORMAT_G726_AAL2:
01516       len = samples / 2;
01517       break;
01518    case AST_FORMAT_SIREN7:
01519       /* 16,000 samples per second at 32kbps is 4,000 bytes per second */
01520       len = samples / (16000 / 4000);
01521       break;
01522    case AST_FORMAT_SIREN14:
01523       /* 32,000 samples per second at 48kbps is 6,000 bytes per second */
01524       len = (int) samples / ((float) 32000 / 6000);
01525       break;
01526    default:
01527       ast_log(LOG_WARNING, "Unable to calculate sample length for format %s\n", ast_getformatname(format));
01528    }
01529 
01530    return len;
01531 }
01532 
01533 int ast_frame_adjust_volume(struct ast_frame *f, int adjustment)
01534 {
01535    int count;
01536    short *fdata = f->data.ptr;
01537    short adjust_value = abs(adjustment);
01538 
01539    if ((f->frametype != AST_FRAME_VOICE) || (f->subclass != AST_FORMAT_SLINEAR))
01540       return -1;
01541 
01542    if (!adjustment)
01543       return 0;
01544 
01545    for (count = 0; count < f->samples; count++) {
01546       if (adjustment > 0) {
01547          ast_slinear_saturated_multiply(&fdata[count], &adjust_value);
01548       } else if (adjustment < 0) {
01549          ast_slinear_saturated_divide(&fdata[count], &adjust_value);
01550       }
01551    }
01552 
01553    return 0;
01554 }
01555 
01556 int ast_frame_slinear_sum(struct ast_frame *f1, struct ast_frame *f2)
01557 {
01558    int count;
01559    short *data1, *data2;
01560 
01561    if ((f1->frametype != AST_FRAME_VOICE) || (f1->subclass != AST_FORMAT_SLINEAR))
01562       return -1;
01563 
01564    if ((f2->frametype != AST_FRAME_VOICE) || (f2->subclass != AST_FORMAT_SLINEAR))
01565       return -1;
01566 
01567    if (f1->samples != f2->samples)
01568       return -1;
01569 
01570    for (count = 0, data1 = f1->data.ptr, data2 = f2->data.ptr;
01571         count < f1->samples;
01572         count++, data1++, data2++)
01573       ast_slinear_saturated_add(data1, data2);
01574 
01575    return 0;
01576 }

Generated on Thu Oct 11 06:47:16 2012 for Asterisk - the Open Source PBX by  doxygen 1.5.6