Thu Sep 7 01:03:00 2017

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 /*** MODULEINFO
00027    <support_level>core</support_level>
00028  ***/
00029 
00030 #include "asterisk.h"
00031 
00032 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 413586 $")
00033 
00034 #include "asterisk/_private.h"
00035 #include "asterisk/lock.h"
00036 #include "asterisk/frame.h"
00037 #include "asterisk/channel.h"
00038 #include "asterisk/cli.h"
00039 #include "asterisk/term.h"
00040 #include "asterisk/utils.h"
00041 #include "asterisk/threadstorage.h"
00042 #include "asterisk/linkedlists.h"
00043 #include "asterisk/translate.h"
00044 #include "asterisk/dsp.h"
00045 #include "asterisk/file.h"
00046 
00047 #if !defined(LOW_MEMORY)
00048 static void frame_cache_cleanup(void *data);
00049 
00050 /*! \brief A per-thread cache of frame headers */
00051 AST_THREADSTORAGE_CUSTOM(frame_cache, NULL, frame_cache_cleanup);
00052 
00053 /*! 
00054  * \brief Maximum ast_frame cache size
00055  *
00056  * In most cases where the frame header cache will be useful, the size
00057  * of the cache will stay very small.  However, it is not always the case that
00058  * the same thread that allocates the frame will be the one freeing them, so
00059  * sometimes a thread will never have any frames in its cache, or the cache
00060  * will never be pulled from.  For the latter case, we limit the maximum size. 
00061  */ 
00062 #define FRAME_CACHE_MAX_SIZE  10
00063 
00064 /*! \brief This is just so ast_frames, a list head struct for holding a list of
00065  *  ast_frame structures, is defined. */
00066 AST_LIST_HEAD_NOLOCK(ast_frames, ast_frame);
00067 
00068 struct ast_frame_cache {
00069    struct ast_frames list;
00070    size_t size;
00071 };
00072 #endif
00073 
00074 #define SMOOTHER_SIZE 8000
00075 
00076 enum frame_type {
00077    TYPE_HIGH,     /* 0x0 */
00078    TYPE_LOW,      /* 0x1 */
00079    TYPE_SILENCE,  /* 0x2 */
00080    TYPE_DONTSEND  /* 0x3 */
00081 };
00082 
00083 #define TYPE_MASK 0x3
00084 
00085 struct ast_smoother {
00086    int size;
00087    format_t format;
00088    int flags;
00089    float samplesperbyte;
00090    unsigned int opt_needs_swap:1;
00091    struct ast_frame f;
00092    struct timeval delivery;
00093    char data[SMOOTHER_SIZE];
00094    char framedata[SMOOTHER_SIZE + AST_FRIENDLY_OFFSET];
00095    struct ast_frame *opt;
00096    int len;
00097 };
00098 
00099 /*! \brief Definition of supported media formats (codecs) */
00100 static const struct ast_format_list AST_FORMAT_LIST[] = {
00101    { AST_FORMAT_G723_1 , "g723", 8000, "G.723.1", 20, 30, 300, 30, 30 },                                  /*!< G723.1 */
00102    { AST_FORMAT_GSM, "gsm", 8000, "GSM", 33, 20, 300, 20, 20 },                                           /*!< codec_gsm.c */
00103    { AST_FORMAT_ULAW, "ulaw", 8000, "G.711 u-law", 80, 10, 150, 10, 20 },                                 /*!< codec_ulaw.c */
00104    { AST_FORMAT_ALAW, "alaw", 8000, "G.711 A-law", 80, 10, 150, 10, 20 },                                 /*!< codec_alaw.c */
00105    { AST_FORMAT_G726, "g726", 8000, "G.726 RFC3551", 40, 10, 300, 10, 20 },                               /*!< codec_g726.c */
00106    { AST_FORMAT_ADPCM, "adpcm" , 8000, "ADPCM", 40, 10, 300, 10, 20 },                                    /*!< codec_adpcm.c */
00107    { AST_FORMAT_SLINEAR, "slin", 8000, "16 bit Signed Linear PCM", 160, 10, 70, 10, 20, AST_SMOOTHER_FLAG_BE }, /*!< Signed linear */
00108    { AST_FORMAT_LPC10, "lpc10", 8000, "LPC10", 7, 20, 20, 20, 20 },                                       /*!< codec_lpc10.c */ 
00109    { AST_FORMAT_G729A, "g729", 8000, "G.729A", 10, 10, 230, 10, 20, AST_SMOOTHER_FLAG_G729 },             /*!< Binary commercial distribution */
00110    { AST_FORMAT_SPEEX, "speex", 8000, "SpeeX", 10, 10, 60, 10, 20 },                                      /*!< codec_speex.c */
00111    { AST_FORMAT_SPEEX16, "speex16", 16000, "SpeeX 16khz", 10, 10, 60, 10, 20 },                          /*!< codec_speex.c */
00112    { AST_FORMAT_ILBC, "ilbc", 8000, "iLBC", 50, 30, 30, 30, 30 },                                         /*!< codec_ilbc.c */ /* inc=30ms - workaround */
00113    { AST_FORMAT_G726_AAL2, "g726aal2", 8000, "G.726 AAL2", 40, 10, 300, 10, 20 },                         /*!< codec_g726.c */
00114    { AST_FORMAT_G722, "g722", 16000, "G722", 80, 10, 150, 10, 20 },                                       /*!< codec_g722.c */
00115    { AST_FORMAT_SLINEAR16, "slin16", 16000, "16 bit Signed Linear PCM (16kHz)", 320, 10, 70, 10, 20, AST_SMOOTHER_FLAG_BE },    /*!< Signed linear (16kHz) */
00116    { AST_FORMAT_JPEG, "jpeg", 0, "JPEG image"},                                                           /*!< See format_jpeg.c */
00117    { AST_FORMAT_PNG, "png", 0, "PNG image"},                                                              /*!< PNG Image format */
00118    { AST_FORMAT_H261, "h261", 0, "H.261 Video" },                                                         /*!< H.261 Video Passthrough */
00119    { AST_FORMAT_H263, "h263", 0, "H.263 Video" },                                                         /*!< H.263 Passthrough support, see format_h263.c */
00120    { AST_FORMAT_H263_PLUS, "h263p", 0, "H.263+ Video" },                                                  /*!< H.263plus passthrough support See format_h263.c */
00121    { AST_FORMAT_H264, "h264", 0, "H.264 Video" },                                                         /*!< Passthrough support, see format_h263.c */
00122    { AST_FORMAT_MP4_VIDEO, "mpeg4", 0, "MPEG4 Video" },                                                   /*!< Passthrough support for MPEG4 */
00123    { AST_FORMAT_T140RED, "red", 1, "T.140 Realtime Text with redundancy"},                                /*!< Redundant T.140 Realtime Text */
00124    { AST_FORMAT_T140, "t140", 0, "Passthrough T.140 Realtime Text" },                                     /*!< Passthrough support for T.140 Realtime Text */
00125    { AST_FORMAT_SIREN7, "siren7", 16000, "ITU G.722.1 (Siren7, licensed from Polycom)", 80, 20, 80, 20, 20 },        /*!< Binary commercial distribution */
00126    { AST_FORMAT_SIREN14, "siren14", 32000, "ITU G.722.1 Annex C, (Siren14, licensed from Polycom)", 120, 20, 80, 20, 20 }, /*!< Binary commercial distribution */
00127    { AST_FORMAT_TESTLAW, "testlaw", 8000, "G.711 test-law", 80, 10, 150, 10, 20 },                        /*!< codec_ulaw.c */
00128    { AST_FORMAT_G719, "g719", 48000, "ITU G.719", 160, 20, 80, 20, 20 },
00129 };
00130 
00131 struct ast_frame ast_null_frame = { AST_FRAME_NULL, };
00132 
00133 static int smoother_frame_feed(struct ast_smoother *s, struct ast_frame *f, int swap)
00134 {
00135    if (s->flags & AST_SMOOTHER_FLAG_G729) {
00136       if (s->len % 10) {
00137          ast_log(LOG_NOTICE, "Dropping extra frame of G.729 since we already have a VAD frame at the end\n");
00138          return 0;
00139       }
00140    }
00141    if (swap) {
00142       ast_swapcopy_samples(s->data + s->len, f->data.ptr, f->samples);
00143    } else {
00144       memcpy(s->data + s->len, f->data.ptr, f->datalen);
00145    }
00146    /* If either side is empty, reset the delivery time */
00147    if (!s->len || ast_tvzero(f->delivery) || ast_tvzero(s->delivery)) { /* XXX really ? */
00148       s->delivery = f->delivery;
00149    }
00150    s->len += f->datalen;
00151 
00152    return 0;
00153 }
00154 
00155 void ast_smoother_reset(struct ast_smoother *s, int bytes)
00156 {
00157    memset(s, 0, sizeof(*s));
00158    s->size = bytes;
00159 }
00160 
00161 void ast_smoother_reconfigure(struct ast_smoother *s, int bytes)
00162 {
00163    /* if there is no change, then nothing to do */
00164    if (s->size == bytes) {
00165       return;
00166    }
00167    /* set the new desired output size */
00168    s->size = bytes;
00169    /* if there is no 'optimized' frame in the smoother,
00170     *   then there is nothing left to do
00171     */
00172    if (!s->opt) {
00173       return;
00174    }
00175    /* there is an 'optimized' frame here at the old size,
00176     * but it must now be put into the buffer so the data
00177     * can be extracted at the new size
00178     */
00179    smoother_frame_feed(s, s->opt, s->opt_needs_swap);
00180    s->opt = NULL;
00181 }
00182 
00183 struct ast_smoother *ast_smoother_new(int size)
00184 {
00185    struct ast_smoother *s;
00186    if (size < 1)
00187       return NULL;
00188    if ((s = ast_malloc(sizeof(*s))))
00189       ast_smoother_reset(s, size);
00190    return s;
00191 }
00192 
00193 int ast_smoother_get_flags(struct ast_smoother *s)
00194 {
00195    return s->flags;
00196 }
00197 
00198 void ast_smoother_set_flags(struct ast_smoother *s, int flags)
00199 {
00200    s->flags = flags;
00201 }
00202 
00203 int ast_smoother_test_flag(struct ast_smoother *s, int flag)
00204 {
00205    return (s->flags & flag);
00206 }
00207 
00208 int __ast_smoother_feed(struct ast_smoother *s, struct ast_frame *f, int swap)
00209 {
00210    if (f->frametype != AST_FRAME_VOICE) {
00211       ast_log(LOG_WARNING, "Huh?  Can't smooth a non-voice frame!\n");
00212       return -1;
00213    }
00214    if (!s->format) {
00215       s->format = f->subclass.codec;
00216       s->samplesperbyte = (float)f->samples / (float)f->datalen;
00217    } else if (s->format != f->subclass.codec) {
00218       ast_log(LOG_WARNING, "Smoother was working on %s format frames, now trying to feed %s?\n",
00219          ast_getformatname(s->format), ast_getformatname(f->subclass.codec));
00220       return -1;
00221    }
00222    if (s->len + f->datalen > SMOOTHER_SIZE) {
00223       ast_log(LOG_WARNING, "Out of smoother space\n");
00224       return -1;
00225    }
00226    if (((f->datalen == s->size) ||
00227         ((f->datalen < 10) && (s->flags & AST_SMOOTHER_FLAG_G729))) &&
00228        !s->opt &&
00229        !s->len &&
00230        (f->offset >= AST_MIN_OFFSET)) {
00231       /* Optimize by sending the frame we just got
00232          on the next read, thus eliminating the douple
00233          copy */
00234       if (swap)
00235          ast_swapcopy_samples(f->data.ptr, f->data.ptr, f->samples);
00236       s->opt = f;
00237       s->opt_needs_swap = swap ? 1 : 0;
00238       return 0;
00239    }
00240 
00241    return smoother_frame_feed(s, f, swap);
00242 }
00243 
00244 struct ast_frame *ast_smoother_read(struct ast_smoother *s)
00245 {
00246    struct ast_frame *opt;
00247    int len;
00248 
00249    /* IF we have an optimization frame, send it */
00250    if (s->opt) {
00251       if (s->opt->offset < AST_FRIENDLY_OFFSET)
00252          ast_log(LOG_WARNING, "Returning a frame of inappropriate offset (%d).\n",
00253                      s->opt->offset);
00254       opt = s->opt;
00255       s->opt = NULL;
00256       return opt;
00257    }
00258 
00259    /* Make sure we have enough data */
00260    if (s->len < s->size) {
00261       /* Or, if this is a G.729 frame with VAD on it, send it immediately anyway */
00262       if (!((s->flags & AST_SMOOTHER_FLAG_G729) && (s->len % 10)))
00263          return NULL;
00264    }
00265    len = s->size;
00266    if (len > s->len)
00267       len = s->len;
00268    /* Make frame */
00269    s->f.frametype = AST_FRAME_VOICE;
00270    s->f.subclass.codec = s->format;
00271    s->f.data.ptr = s->framedata + AST_FRIENDLY_OFFSET;
00272    s->f.offset = AST_FRIENDLY_OFFSET;
00273    s->f.datalen = len;
00274    /* Samples will be improper given VAD, but with VAD the concept really doesn't even exist */
00275    s->f.samples = len * s->samplesperbyte;   /* XXX rounding */
00276    s->f.delivery = s->delivery;
00277    /* Fill Data */
00278    memcpy(s->f.data.ptr, s->data, len);
00279    s->len -= len;
00280    /* Move remaining data to the front if applicable */
00281    if (s->len) {
00282       /* In principle this should all be fine because if we are sending
00283          G.729 VAD, the next timestamp will take over anyawy */
00284       memmove(s->data, s->data + len, s->len);
00285       if (!ast_tvzero(s->delivery)) {
00286          /* If we have delivery time, increment it, otherwise, leave it at 0 */
00287          s->delivery = ast_tvadd(s->delivery, ast_samp2tv(s->f.samples, ast_format_rate(s->format)));
00288       }
00289    }
00290    /* Return frame */
00291    return &s->f;
00292 }
00293 
00294 void ast_smoother_free(struct ast_smoother *s)
00295 {
00296    ast_free(s);
00297 }
00298 
00299 static struct ast_frame *ast_frame_header_new(void)
00300 {
00301    struct ast_frame *f;
00302 
00303 #if !defined(LOW_MEMORY)
00304    struct ast_frame_cache *frames;
00305 
00306    if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames)))) {
00307       if ((f = AST_LIST_REMOVE_HEAD(&frames->list, frame_list))) {
00308          size_t mallocd_len = f->mallocd_hdr_len;
00309          memset(f, 0, sizeof(*f));
00310          f->mallocd_hdr_len = mallocd_len;
00311          f->mallocd = AST_MALLOCD_HDR;
00312          frames->size--;
00313          return f;
00314       }
00315    }
00316    if (!(f = ast_calloc_cache(1, sizeof(*f))))
00317       return NULL;
00318 #else
00319    if (!(f = ast_calloc(1, sizeof(*f))))
00320       return NULL;
00321 #endif
00322 
00323    f->mallocd_hdr_len = sizeof(*f);
00324    
00325    return f;
00326 }
00327 
00328 #if !defined(LOW_MEMORY)
00329 static void frame_cache_cleanup(void *data)
00330 {
00331    struct ast_frame_cache *frames = data;
00332    struct ast_frame *f;
00333 
00334    while ((f = AST_LIST_REMOVE_HEAD(&frames->list, frame_list)))
00335       ast_free(f);
00336    
00337    ast_free(frames);
00338 }
00339 #endif
00340 
00341 static void __frame_free(struct ast_frame *fr, int cache)
00342 {
00343    if (!fr->mallocd)
00344       return;
00345 
00346 #if !defined(LOW_MEMORY)
00347    if (cache && fr->mallocd == AST_MALLOCD_HDR) {
00348       /* Cool, only the header is malloc'd, let's just cache those for now 
00349        * to keep things simple... */
00350       struct ast_frame_cache *frames;
00351 
00352       if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames))) &&
00353           (frames->size < FRAME_CACHE_MAX_SIZE)) {
00354          AST_LIST_INSERT_HEAD(&frames->list, fr, frame_list);
00355          frames->size++;
00356          return;
00357       }
00358    }
00359 #endif
00360    
00361    if (fr->mallocd & AST_MALLOCD_DATA) {
00362       if (fr->data.ptr) 
00363          ast_free(fr->data.ptr - fr->offset);
00364    }
00365    if (fr->mallocd & AST_MALLOCD_SRC) {
00366       if (fr->src)
00367          ast_free((void *) fr->src);
00368    }
00369    if (fr->mallocd & AST_MALLOCD_HDR) {
00370       ast_free(fr);
00371    }
00372 }
00373 
00374 
00375 void ast_frame_free(struct ast_frame *frame, int cache)
00376 {
00377    struct ast_frame *next;
00378 
00379    for (next = AST_LIST_NEXT(frame, frame_list);
00380         frame;
00381         frame = next, next = frame ? AST_LIST_NEXT(frame, frame_list) : NULL) {
00382       __frame_free(frame, cache);
00383    }
00384 }
00385 
00386 /*!
00387  * \brief 'isolates' a frame by duplicating non-malloc'ed components
00388  * (header, src, data).
00389  * On return all components are malloc'ed
00390  */
00391 struct ast_frame *ast_frisolate(struct ast_frame *fr)
00392 {
00393    struct ast_frame *out;
00394    void *newdata;
00395 
00396    /* if none of the existing frame is malloc'd, let ast_frdup() do it
00397       since it is more efficient
00398    */
00399    if (fr->mallocd == 0) {
00400       return ast_frdup(fr);
00401    }
00402 
00403    /* if everything is already malloc'd, we are done */
00404    if ((fr->mallocd & (AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA)) ==
00405        (AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA)) {
00406       return fr;
00407    }
00408 
00409    if (!(fr->mallocd & AST_MALLOCD_HDR)) {
00410       /* Allocate a new header if needed */
00411       if (!(out = ast_frame_header_new())) {
00412          return NULL;
00413       }
00414       out->frametype = fr->frametype;
00415       out->subclass.codec = fr->subclass.codec;
00416       out->datalen = fr->datalen;
00417       out->samples = fr->samples;
00418       out->offset = fr->offset;
00419       /* Copy the timing data */
00420       ast_copy_flags(out, fr, AST_FRFLAG_HAS_TIMING_INFO);
00421       if (ast_test_flag(fr, AST_FRFLAG_HAS_TIMING_INFO)) {
00422          out->ts = fr->ts;
00423          out->len = fr->len;
00424          out->seqno = fr->seqno;
00425       }
00426    } else {
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.codec = f->subclass.codec;
00523    out->datalen = f->datalen;
00524    out->samples = f->samples;
00525    out->delivery = f->delivery;
00526    /* Even though this new frame was allocated from the heap, we can't mark it
00527     * with AST_MALLOCD_HDR, AST_MALLOCD_DATA and AST_MALLOCD_SRC, because that
00528     * would cause ast_frfree() to attempt to individually free each of those
00529     * under the assumption that they were separately allocated. Since this frame
00530     * was allocated in a single allocation, we'll only mark it as if the header
00531     * was heap-allocated; this will result in the entire frame being properly freed.
00532     */
00533    out->mallocd = AST_MALLOCD_HDR;
00534    out->offset = AST_FRIENDLY_OFFSET;
00535    if (out->datalen) {
00536       out->data.ptr = buf + sizeof(*out) + AST_FRIENDLY_OFFSET;
00537       memcpy(out->data.ptr, f->data.ptr, out->datalen);
00538    } else {
00539       out->data.uint32 = f->data.uint32;
00540    }
00541    if (srclen > 0) {
00542       /* This may seem a little strange, but it's to avoid a gcc (4.2.4) compiler warning */
00543       char *src;
00544       out->src = buf + sizeof(*out) + AST_FRIENDLY_OFFSET + f->datalen;
00545       src = (char *) out->src;
00546       /* Must have space since we allocated for it */
00547       strcpy(src, f->src);
00548    }
00549    ast_copy_flags(out, f, AST_FRFLAG_HAS_TIMING_INFO);
00550    out->ts = f->ts;
00551    out->len = f->len;
00552    out->seqno = f->seqno;
00553    return out;
00554 }
00555 
00556 void ast_swapcopy_samples(void *dst, const void *src, int samples)
00557 {
00558    int i;
00559    unsigned short *dst_s = dst;
00560    const unsigned short *src_s = src;
00561 
00562    for (i = 0; i < samples; i++)
00563       dst_s[i] = (src_s[i]<<8) | (src_s[i]>>8);
00564 }
00565 
00566 
00567 const struct ast_format_list *ast_get_format_list_index(int idx) 
00568 {
00569    return &AST_FORMAT_LIST[idx];
00570 }
00571 
00572 const struct ast_format_list *ast_get_format_list(size_t *size) 
00573 {
00574    *size = ARRAY_LEN(AST_FORMAT_LIST);
00575    return AST_FORMAT_LIST;
00576 }
00577 
00578 char* ast_getformatname(format_t format)
00579 {
00580    int x;
00581    char *ret = "unknown";
00582    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00583       if (AST_FORMAT_LIST[x].bits == format) {
00584          ret = AST_FORMAT_LIST[x].name;
00585          break;
00586       }
00587    }
00588    return ret;
00589 }
00590 
00591 char *ast_getformatname_multiple(char *buf, size_t size, format_t format)
00592 {
00593    int x;
00594    unsigned len;
00595    char *start, *end = buf;
00596 
00597    if (!size)
00598       return buf;
00599    snprintf(end, size, "0x%llx (", (unsigned long long) format);
00600    len = strlen(end);
00601    end += len;
00602    size -= len;
00603    start = end;
00604    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00605       if (AST_FORMAT_LIST[x].bits & format) {
00606          snprintf(end, size, "%s|", AST_FORMAT_LIST[x].name);
00607          len = strlen(end);
00608          end += len;
00609          size -= len;
00610       }
00611    }
00612    if (start == end)
00613       ast_copy_string(start, "nothing)", size);
00614    else if (size > 1)
00615       *(end - 1) = ')';
00616    return buf;
00617 }
00618 
00619 static struct ast_codec_alias_table {
00620    char *alias;
00621    char *realname;
00622 } ast_codec_alias_table[] = {
00623    { "slinear", "slin"},
00624    { "slinear16", "slin16"},
00625    { "g723.1", "g723"},
00626    { "g722.1", "siren7"},
00627    { "g722.1c", "siren14"},
00628 };
00629 
00630 static const char *ast_expand_codec_alias(const char *in)
00631 {
00632    int x;
00633 
00634    for (x = 0; x < ARRAY_LEN(ast_codec_alias_table); x++) {
00635       if (!strcmp(in,ast_codec_alias_table[x].alias))
00636          return ast_codec_alias_table[x].realname;
00637    }
00638    return in;
00639 }
00640 
00641 format_t ast_getformatbyname(const char *name)
00642 {
00643    int x, all;
00644    format_t format = 0;
00645 
00646    all = strcasecmp(name, "all") ? 0 : 1;
00647    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00648       if (all || 
00649            !strcasecmp(AST_FORMAT_LIST[x].name,name) ||
00650            !strcasecmp(AST_FORMAT_LIST[x].name, ast_expand_codec_alias(name))) {
00651          format |= AST_FORMAT_LIST[x].bits;
00652          if (!all)
00653             break;
00654       }
00655    }
00656 
00657    return format;
00658 }
00659 
00660 char *ast_codec2str(format_t codec)
00661 {
00662    int x;
00663    char *ret = "unknown";
00664    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00665       if (AST_FORMAT_LIST[x].bits == codec) {
00666          ret = AST_FORMAT_LIST[x].desc;
00667          break;
00668       }
00669    }
00670    return ret;
00671 }
00672 
00673 static char *show_codecs(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00674 {
00675    int i, found=0;
00676    char hex[25];
00677 
00678    switch (cmd) {
00679    case CLI_INIT:
00680       e->command = "core show codecs [audio|video|image|text]";
00681       e->usage =
00682          "Usage: core show codecs [audio|video|image|text]\n"
00683          "       Displays codec mapping\n";
00684       return NULL;
00685    case CLI_GENERATE:
00686       return NULL;
00687    }
00688 
00689    if ((a->argc < 3) || (a->argc > 4))
00690       return CLI_SHOWUSAGE;
00691 
00692    if (!ast_opt_dont_warn)
00693       ast_cli(a->fd, "Disclaimer: this command is for informational purposes only.\n"
00694             "\tIt does not indicate anything about your configuration.\n");
00695 
00696    ast_cli(a->fd, "%19s %9s %20s   TYPE   %8s   %s\n","INT","BINARY","HEX","NAME","DESCRIPTION");
00697    ast_cli(a->fd, "-----------------------------------------------------------------------------------\n");
00698    for (i = 0; i < 63; i++) {
00699 
00700       if (a->argc == 4) {
00701          if (!strcasecmp(a->argv[3], "audio")) {
00702             if (!((1LL << i) & AST_FORMAT_AUDIO_MASK)) {
00703                continue;
00704             }
00705          } else if (!strcasecmp(a->argv[3], "video")) {
00706             if (!((1LL << i) & AST_FORMAT_VIDEO_MASK)) {
00707                continue;
00708             }
00709          } else if (!strcasecmp(a->argv[3], "image")) {
00710             if (i != 16 && i != 17) {
00711                continue;
00712             }
00713          } else if (!strcasecmp(a->argv[3], "text")) {
00714             if (!((1LL << i) & AST_FORMAT_TEXT_MASK)) {
00715                continue;
00716             }
00717          } else {
00718             continue;
00719          }
00720       }
00721 
00722       snprintf(hex, sizeof(hex), "(0x%llx)", 1ULL << i);
00723       ast_cli(a->fd, "%19llu (1 << %2d) %20s  %5s   %8s   (%s)\n", 1ULL << i, i, hex,
00724          ((1LL << i) & AST_FORMAT_AUDIO_MASK) ? "audio" :
00725          i == 16 || i == 17 ? "image" :
00726          ((1LL << i) & AST_FORMAT_VIDEO_MASK) ? "video" :
00727          ((1LL << i) & AST_FORMAT_TEXT_MASK) ? "text" :
00728          "(unk)",
00729          ast_getformatname(1LL << i), ast_codec2str(1LL << i));
00730       found = 1;
00731    }
00732 
00733    if (!found) {
00734       return CLI_SHOWUSAGE;
00735    } else {
00736       return CLI_SUCCESS;
00737    }
00738 }
00739 
00740 static char *show_codec_n(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00741 {
00742    format_t codec;
00743    int i, found = 0;
00744    long long type_punned_codec;
00745 
00746    switch (cmd) {
00747    case CLI_INIT:
00748       e->command = "core show codec";
00749       e->usage =
00750          "Usage: core show codec <number>\n"
00751          "       Displays codec mapping\n";
00752       return NULL;
00753    case CLI_GENERATE:
00754       return NULL;
00755    }
00756 
00757    if (a->argc != 4)
00758       return CLI_SHOWUSAGE;
00759 
00760    if (sscanf(a->argv[3], "%30lld", &type_punned_codec) != 1) {
00761       return CLI_SHOWUSAGE;
00762    }
00763    codec = type_punned_codec;
00764 
00765    for (i = 0; i < 63; i++)
00766       if (codec & (1LL << i)) {
00767          found = 1;
00768          ast_cli(a->fd, "%11llu (1 << %2d)  %s\n", 1ULL << i, i, ast_codec2str(1LL << i));
00769       }
00770 
00771    if (!found)
00772       ast_cli(a->fd, "Codec %lld not found\n", (long long) codec);
00773 
00774    return CLI_SUCCESS;
00775 }
00776 
00777 /*! Dump a frame for debugging purposes */
00778 void ast_frame_dump(const char *name, struct ast_frame *f, char *prefix)
00779 {
00780    const char noname[] = "unknown";
00781    char ftype[40] = "Unknown Frametype";
00782    char cft[80];
00783    char subclass[40] = "Unknown Subclass";
00784    char csub[80];
00785    char moreinfo[40] = "";
00786    char cn[60];
00787    char cp[40];
00788    char cmn[40];
00789    const char *message = "Unknown";
00790 
00791    if (!name)
00792       name = noname;
00793 
00794 
00795    if (!f) {
00796       ast_verbose("%s [ %s (NULL) ] [%s]\n", 
00797          term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00798          term_color(cft, "HANGUP", COLOR_BRRED, COLOR_BLACK, sizeof(cft)), 
00799          term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00800       return;
00801    }
00802    /* XXX We should probably print one each of voice and video when the format changes XXX */
00803    if (f->frametype == AST_FRAME_VOICE)
00804       return;
00805    if (f->frametype == AST_FRAME_VIDEO)
00806       return;
00807    switch(f->frametype) {
00808    case AST_FRAME_DTMF_BEGIN:
00809       strcpy(ftype, "DTMF Begin");
00810       subclass[0] = f->subclass.integer;
00811       subclass[1] = '\0';
00812       break;
00813    case AST_FRAME_DTMF_END:
00814       strcpy(ftype, "DTMF End");
00815       subclass[0] = f->subclass.integer;
00816       subclass[1] = '\0';
00817       break;
00818    case AST_FRAME_CONTROL:
00819       strcpy(ftype, "Control");
00820       switch (f->subclass.integer) {
00821       case AST_CONTROL_HANGUP:
00822          strcpy(subclass, "Hangup");
00823          break;
00824       case AST_CONTROL_RING:
00825          strcpy(subclass, "Ring");
00826          break;
00827       case AST_CONTROL_RINGING:
00828          strcpy(subclass, "Ringing");
00829          break;
00830       case AST_CONTROL_ANSWER:
00831          strcpy(subclass, "Answer");
00832          break;
00833       case AST_CONTROL_BUSY:
00834          strcpy(subclass, "Busy");
00835          break;
00836       case AST_CONTROL_TAKEOFFHOOK:
00837          strcpy(subclass, "Take Off Hook");
00838          break;
00839       case AST_CONTROL_OFFHOOK:
00840          strcpy(subclass, "Line Off Hook");
00841          break;
00842       case AST_CONTROL_CONGESTION:
00843          strcpy(subclass, "Congestion");
00844          break;
00845       case AST_CONTROL_FLASH:
00846          strcpy(subclass, "Flash");
00847          break;
00848       case AST_CONTROL_WINK:
00849          strcpy(subclass, "Wink");
00850          break;
00851       case AST_CONTROL_OPTION:
00852          strcpy(subclass, "Option");
00853          break;
00854       case AST_CONTROL_RADIO_KEY:
00855          strcpy(subclass, "Key Radio");
00856          break;
00857       case AST_CONTROL_RADIO_UNKEY:
00858          strcpy(subclass, "Unkey Radio");
00859          break;
00860       case AST_CONTROL_HOLD:
00861          strcpy(subclass, "Hold");
00862          break;
00863       case AST_CONTROL_UNHOLD:
00864          strcpy(subclass, "Unhold");
00865          break;
00866       case AST_CONTROL_T38_PARAMETERS:
00867          if (f->datalen != sizeof(struct ast_control_t38_parameters)) {
00868             message = "Invalid";
00869          } else {
00870             struct ast_control_t38_parameters *parameters = f->data.ptr;
00871             enum ast_control_t38 state = parameters->request_response;
00872             if (state == AST_T38_REQUEST_NEGOTIATE)
00873                message = "Negotiation Requested";
00874             else if (state == AST_T38_REQUEST_TERMINATE)
00875                message = "Negotiation Request Terminated";
00876             else if (state == AST_T38_NEGOTIATED)
00877                message = "Negotiated";
00878             else if (state == AST_T38_TERMINATED)
00879                message = "Terminated";
00880             else if (state == AST_T38_REFUSED)
00881                message = "Refused";
00882          }
00883          snprintf(subclass, sizeof(subclass), "T38_Parameters/%s", message);
00884          break;
00885       case -1:
00886          strcpy(subclass, "Stop generators");
00887          break;
00888       default:
00889          snprintf(subclass, sizeof(subclass), "Unknown control '%d'", f->subclass.integer);
00890       }
00891       break;
00892    case AST_FRAME_NULL:
00893       strcpy(ftype, "Null Frame");
00894       strcpy(subclass, "N/A");
00895       break;
00896    case AST_FRAME_IAX:
00897       /* Should never happen */
00898       strcpy(ftype, "IAX Specific");
00899       snprintf(subclass, sizeof(subclass), "IAX Frametype %d", f->subclass.integer);
00900       break;
00901    case AST_FRAME_TEXT:
00902       strcpy(ftype, "Text");
00903       strcpy(subclass, "N/A");
00904       ast_copy_string(moreinfo, f->data.ptr, sizeof(moreinfo));
00905       break;
00906    case AST_FRAME_IMAGE:
00907       strcpy(ftype, "Image");
00908       snprintf(subclass, sizeof(subclass), "Image format %s\n", ast_getformatname(f->subclass.codec));
00909       break;
00910    case AST_FRAME_HTML:
00911       strcpy(ftype, "HTML");
00912       switch (f->subclass.integer) {
00913       case AST_HTML_URL:
00914          strcpy(subclass, "URL");
00915          ast_copy_string(moreinfo, f->data.ptr, sizeof(moreinfo));
00916          break;
00917       case AST_HTML_DATA:
00918          strcpy(subclass, "Data");
00919          break;
00920       case AST_HTML_BEGIN:
00921          strcpy(subclass, "Begin");
00922          break;
00923       case AST_HTML_END:
00924          strcpy(subclass, "End");
00925          break;
00926       case AST_HTML_LDCOMPLETE:
00927          strcpy(subclass, "Load Complete");
00928          break;
00929       case AST_HTML_NOSUPPORT:
00930          strcpy(subclass, "No Support");
00931          break;
00932       case AST_HTML_LINKURL:
00933          strcpy(subclass, "Link URL");
00934          ast_copy_string(moreinfo, f->data.ptr, sizeof(moreinfo));
00935          break;
00936       case AST_HTML_UNLINK:
00937          strcpy(subclass, "Unlink");
00938          break;
00939       case AST_HTML_LINKREJECT:
00940          strcpy(subclass, "Link Reject");
00941          break;
00942       default:
00943          snprintf(subclass, sizeof(subclass), "Unknown HTML frame '%d'\n", f->subclass.integer);
00944          break;
00945       }
00946       break;
00947    case AST_FRAME_MODEM:
00948       strcpy(ftype, "Modem");
00949       switch (f->subclass.integer) {
00950       case AST_MODEM_T38:
00951          strcpy(subclass, "T.38");
00952          break;
00953       case AST_MODEM_V150:
00954          strcpy(subclass, "V.150");
00955          break;
00956       default:
00957          snprintf(subclass, sizeof(subclass), "Unknown MODEM frame '%d'\n", f->subclass.integer);
00958          break;
00959       }
00960       break;
00961    default:
00962       snprintf(ftype, sizeof(ftype), "Unknown Frametype '%u'", f->frametype);
00963    }
00964    if (!ast_strlen_zero(moreinfo))
00965       ast_verbose("%s [ TYPE: %s (%u) SUBCLASS: %s (%d) '%s' ] [%s]\n",  
00966              term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00967              term_color(cft, ftype, COLOR_BRRED, COLOR_BLACK, sizeof(cft)),
00968              f->frametype, 
00969              term_color(csub, subclass, COLOR_BRCYAN, COLOR_BLACK, sizeof(csub)),
00970              f->subclass.integer, 
00971              term_color(cmn, moreinfo, COLOR_BRGREEN, COLOR_BLACK, sizeof(cmn)),
00972              term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00973    else
00974       ast_verbose("%s [ TYPE: %s (%u) SUBCLASS: %s (%d) ] [%s]\n",  
00975              term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00976              term_color(cft, ftype, COLOR_BRRED, COLOR_BLACK, sizeof(cft)),
00977              f->frametype, 
00978              term_color(csub, subclass, COLOR_BRCYAN, COLOR_BLACK, sizeof(csub)),
00979              f->subclass.integer, 
00980              term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00981 }
00982 
00983 
00984 /* Builtin Asterisk CLI-commands for debugging */
00985 static struct ast_cli_entry my_clis[] = {
00986    AST_CLI_DEFINE(show_codecs, "Displays a list of codecs"),
00987    AST_CLI_DEFINE(show_codec_n, "Shows a specific codec"),
00988 };
00989 
00990 static void framer_shutdown(void)
00991 {
00992    ast_cli_unregister_multiple(my_clis, ARRAY_LEN(my_clis));
00993 }
00994 
00995 int init_framer(void)
00996 {
00997    ast_cli_register_multiple(my_clis, ARRAY_LEN(my_clis));
00998    ast_register_atexit(framer_shutdown);
00999    return 0;   
01000 }
01001 
01002 void ast_codec_pref_convert(struct ast_codec_pref *pref, char *buf, size_t size, int right) 
01003 {
01004    int x, differential = (int) 'A', mem;
01005    char *from, *to;
01006 
01007    if (right) {
01008       from = pref->order;
01009       to = buf;
01010       mem = size;
01011    } else {
01012       to = pref->order;
01013       from = buf;
01014       mem = sizeof(format_t) * 8;
01015    }
01016 
01017    memset(to, 0, mem);
01018    for (x = 0; x < sizeof(format_t) * 8; x++) {
01019       if (!from[x])
01020          break;
01021       to[x] = right ? (from[x] + differential) : (from[x] - differential);
01022    }
01023 }
01024 
01025 int ast_codec_pref_string(struct ast_codec_pref *pref, char *buf, size_t size) 
01026 {
01027    int x;
01028    format_t codec; 
01029    size_t total_len, slen;
01030    char *formatname;
01031    
01032    memset(buf, 0, size);
01033    total_len = size;
01034    buf[0] = '(';
01035    total_len--;
01036    for (x = 0; x < sizeof(format_t) * 8; x++) {
01037       if (total_len <= 0)
01038          break;
01039       if (!(codec = ast_codec_pref_index(pref,x)))
01040          break;
01041       if ((formatname = ast_getformatname(codec))) {
01042          slen = strlen(formatname);
01043          if (slen > total_len)
01044             break;
01045          strncat(buf, formatname, total_len - 1); /* safe */
01046          total_len -= slen;
01047       }
01048       if (total_len && x < sizeof(format_t) * 8 - 1 && ast_codec_pref_index(pref, x + 1)) {
01049          strncat(buf, "|", total_len - 1); /* safe */
01050          total_len--;
01051       }
01052    }
01053    if (total_len) {
01054       strncat(buf, ")", total_len - 1); /* safe */
01055       total_len--;
01056    }
01057 
01058    return size - total_len;
01059 }
01060 
01061 format_t ast_codec_pref_index(struct ast_codec_pref *pref, int idx)
01062 {
01063    int slot = 0;
01064 
01065    if ((idx >= 0) && (idx < sizeof(pref->order))) {
01066       slot = pref->order[idx];
01067    }
01068 
01069    return slot ? AST_FORMAT_LIST[slot - 1].bits : 0;
01070 }
01071 
01072 /*! \brief Remove codec from pref list */
01073 void ast_codec_pref_remove(struct ast_codec_pref *pref, format_t format)
01074 {
01075    struct ast_codec_pref oldorder;
01076    int x, y = 0;
01077    int slot;
01078    int size;
01079 
01080    if (!pref->order[0])
01081       return;
01082 
01083    memcpy(&oldorder, pref, sizeof(oldorder));
01084    memset(pref, 0, sizeof(*pref));
01085 
01086    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01087       slot = oldorder.order[x];
01088       size = oldorder.framing[x];
01089       if (! slot)
01090          break;
01091       if (AST_FORMAT_LIST[slot-1].bits != format) {
01092          pref->order[y] = slot;
01093          pref->framing[y++] = size;
01094       }
01095    }
01096 }
01097 
01098 /*! \brief Append codec to list */
01099 int ast_codec_pref_append(struct ast_codec_pref *pref, format_t format)
01100 {
01101    int x, newindex = 0;
01102 
01103    ast_codec_pref_remove(pref, format);
01104 
01105    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01106       if (AST_FORMAT_LIST[x].bits == format) {
01107          newindex = x + 1;
01108          break;
01109       }
01110    }
01111 
01112    if (newindex) {
01113       for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01114          if (!pref->order[x]) {
01115             pref->order[x] = newindex;
01116             break;
01117          }
01118       }
01119    }
01120 
01121    return x;
01122 }
01123 
01124 /*! \brief Prepend codec to list */
01125 void ast_codec_pref_prepend(struct ast_codec_pref *pref, format_t format, int only_if_existing)
01126 {
01127    int x, newindex = 0;
01128 
01129    /* First step is to get the codecs "index number" */
01130    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01131       if (AST_FORMAT_LIST[x].bits == format) {
01132          newindex = x + 1;
01133          break;
01134       }
01135    }
01136    /* Done if its unknown */
01137    if (!newindex)
01138       return;
01139 
01140    /* Now find any existing occurrence, or the end */
01141    for (x = 0; x < sizeof(format_t) * 8; x++) {
01142       if (!pref->order[x] || pref->order[x] == newindex)
01143          break;
01144    }
01145 
01146    /* If we failed to find any occurrence, set to the end */
01147    if (x == sizeof(format_t) * 8) {
01148       --x;
01149    }
01150 
01151    if (only_if_existing && !pref->order[x])
01152       return;
01153 
01154    /* Move down to make space to insert - either all the way to the end,
01155       or as far as the existing location (which will be overwritten) */
01156    for (; x > 0; x--) {
01157       pref->order[x] = pref->order[x - 1];
01158       pref->framing[x] = pref->framing[x - 1];
01159    }
01160 
01161    /* And insert the new entry */
01162    pref->order[0] = newindex;
01163    pref->framing[0] = 0; /* ? */
01164 }
01165 
01166 /*! \brief Set packet size for codec */
01167 int ast_codec_pref_setsize(struct ast_codec_pref *pref, format_t format, int framems)
01168 {
01169    int x, idx = -1;
01170 
01171    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01172       if (AST_FORMAT_LIST[x].bits == format) {
01173          idx = x;
01174          break;
01175       }
01176    }
01177 
01178    if (idx < 0)
01179       return -1;
01180 
01181    /* size validation */
01182    if (!framems)
01183       framems = AST_FORMAT_LIST[idx].def_ms;
01184 
01185    if (AST_FORMAT_LIST[idx].inc_ms && framems % AST_FORMAT_LIST[idx].inc_ms) /* avoid division by zero */
01186       framems -= framems % AST_FORMAT_LIST[idx].inc_ms;
01187 
01188    if (framems < AST_FORMAT_LIST[idx].min_ms)
01189       framems = AST_FORMAT_LIST[idx].min_ms;
01190 
01191    if (framems > AST_FORMAT_LIST[idx].max_ms)
01192       framems = AST_FORMAT_LIST[idx].max_ms;
01193 
01194    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01195       if (pref->order[x] == (idx + 1)) {
01196          pref->framing[x] = framems;
01197          break;
01198       }
01199    }
01200 
01201    return x;
01202 }
01203 
01204 /*! \brief Get packet size for codec */
01205 struct ast_format_list ast_codec_pref_getsize(struct ast_codec_pref *pref, format_t format)
01206 {
01207    int x, idx = -1, framems = 0;
01208    struct ast_format_list fmt = { 0, };
01209 
01210    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01211       if (AST_FORMAT_LIST[x].bits == format) {
01212          fmt = AST_FORMAT_LIST[x];
01213          idx = x;
01214          break;
01215       }
01216    }
01217 
01218    if (idx < 0) {
01219       ast_log(AST_LOG_WARNING, "Format %s unknown; unable to get preferred codec packet size\n", ast_getformatname(format));
01220       return fmt;
01221    }
01222 
01223    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01224       if (pref->order[x] == (idx + 1)) {
01225          framems = pref->framing[x];
01226          break;
01227       }
01228    }
01229 
01230    /* size validation */
01231    if (!framems)
01232       framems = AST_FORMAT_LIST[idx].def_ms;
01233 
01234    if (AST_FORMAT_LIST[idx].inc_ms && framems % AST_FORMAT_LIST[idx].inc_ms) /* avoid division by zero */
01235       framems -= framems % AST_FORMAT_LIST[idx].inc_ms;
01236 
01237    if (framems < AST_FORMAT_LIST[idx].min_ms)
01238       framems = AST_FORMAT_LIST[idx].min_ms;
01239 
01240    if (framems > AST_FORMAT_LIST[idx].max_ms)
01241       framems = AST_FORMAT_LIST[idx].max_ms;
01242 
01243    fmt.cur_ms = framems;
01244 
01245    return fmt;
01246 }
01247 
01248 /*! \brief Pick a codec */
01249 format_t ast_codec_choose(struct ast_codec_pref *pref, format_t formats, int find_best)
01250 {
01251    int x, slot;
01252    format_t ret = 0;
01253 
01254    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01255       slot = pref->order[x];
01256 
01257       if (!slot)
01258          break;
01259       if (formats & AST_FORMAT_LIST[slot-1].bits) {
01260          ret = AST_FORMAT_LIST[slot-1].bits;
01261          break;
01262       }
01263    }
01264    if (ret & AST_FORMAT_AUDIO_MASK)
01265       return ret;
01266 
01267    ast_debug(4, "Could not find preferred codec - %s\n", find_best ? "Going for the best codec" : "Returning zero codec");
01268 
01269       return find_best ? ast_best_codec(formats) : 0;
01270 }
01271 
01272 int ast_parse_allow_disallow(struct ast_codec_pref *pref, format_t *mask, const char *list, int allowing) 
01273 {
01274    int errors = 0, framems = 0;
01275    char *parse = NULL, *this = NULL, *psize = NULL;
01276    format_t format = 0;
01277 
01278    parse = ast_strdupa(list);
01279    while ((this = strsep(&parse, ","))) {
01280       framems = 0;
01281       if ((psize = strrchr(this, ':'))) {
01282          *psize++ = '\0';
01283          ast_debug(1, "Packetization for codec: %s is %s\n", this, psize);
01284          framems = atoi(psize);
01285          if (framems < 0) {
01286             framems = 0;
01287             errors++;
01288             ast_log(LOG_WARNING, "Bad packetization value for codec %s\n", this);
01289          }
01290       }
01291       if (!(format = ast_getformatbyname(this))) {
01292          ast_log(LOG_WARNING, "Cannot %s unknown format '%s'\n", allowing ? "allow" : "disallow", this);
01293          errors++;
01294          continue;
01295       }
01296 
01297       if (mask) {
01298          if (allowing)
01299             *mask |= format;
01300          else
01301             *mask &= ~format;
01302       }
01303 
01304       /* Set up a preference list for audio. Do not include video in preferences 
01305          since we can not transcode video and have to use whatever is offered
01306        */
01307       if (pref && (format & AST_FORMAT_AUDIO_MASK)) {
01308          if (strcasecmp(this, "all")) {
01309             if (allowing) {
01310                ast_codec_pref_append(pref, format);
01311                ast_codec_pref_setsize(pref, format, framems);
01312             }
01313             else
01314                ast_codec_pref_remove(pref, format);
01315          } else if (!allowing) {
01316             memset(pref, 0, sizeof(*pref));
01317          }
01318       }
01319    }
01320    return errors;
01321 }
01322 
01323 static int g723_len(unsigned char buf)
01324 {
01325    enum frame_type type = buf & TYPE_MASK;
01326 
01327    switch(type) {
01328    case TYPE_DONTSEND:
01329       return 0;
01330       break;
01331    case TYPE_SILENCE:
01332       return 4;
01333       break;
01334    case TYPE_HIGH:
01335       return 24;
01336       break;
01337    case TYPE_LOW:
01338       return 20;
01339       break;
01340    default:
01341       ast_log(LOG_WARNING, "Badly encoded frame (%u)\n", type);
01342    }
01343    return -1;
01344 }
01345 
01346 static int g723_samples(unsigned char *buf, int maxlen)
01347 {
01348    int pos = 0;
01349    int samples = 0;
01350    int res;
01351    while(pos < maxlen) {
01352       res = g723_len(buf[pos]);
01353       if (res <= 0)
01354          break;
01355       samples += 240;
01356       pos += res;
01357    }
01358    return samples;
01359 }
01360 
01361 static unsigned char get_n_bits_at(unsigned char *data, int n, int bit)
01362 {
01363    int byte = bit / 8;       /* byte containing first bit */
01364    int rem = 8 - (bit % 8);  /* remaining bits in first byte */
01365    unsigned char ret = 0;
01366    
01367    if (n <= 0 || n > 8)
01368       return 0;
01369 
01370    if (rem < n) {
01371       ret = (data[byte] << (n - rem));
01372       ret |= (data[byte + 1] >> (8 - n + rem));
01373    } else {
01374       ret = (data[byte] >> (rem - n));
01375    }
01376 
01377    return (ret & (0xff >> (8 - n)));
01378 }
01379 
01380 static int speex_get_wb_sz_at(unsigned char *data, int len, int bit)
01381 {
01382    static const int SpeexWBSubModeSz[] = {
01383       4, 36, 112, 192,
01384       352, 0, 0, 0 };
01385    int off = bit;
01386    unsigned char c;
01387 
01388    /* skip up to two wideband frames */
01389    if (((len * 8 - off) >= 5) && 
01390       get_n_bits_at(data, 1, off)) {
01391       c = get_n_bits_at(data, 3, off + 1);
01392       off += SpeexWBSubModeSz[c];
01393 
01394       if (((len * 8 - off) >= 5) && 
01395          get_n_bits_at(data, 1, off)) {
01396          c = get_n_bits_at(data, 3, off + 1);
01397          off += SpeexWBSubModeSz[c];
01398 
01399          if (((len * 8 - off) >= 5) && 
01400             get_n_bits_at(data, 1, off)) {
01401             ast_log(LOG_WARNING, "Encountered corrupt speex frame; too many wideband frames in a row.\n");
01402             return -1;
01403          }
01404       }
01405 
01406    }
01407    return off - bit;
01408 }
01409 
01410 static int speex_samples(unsigned char *data, int len)
01411 {
01412    static const int SpeexSubModeSz[] = {
01413       5, 43, 119, 160,
01414       220, 300, 364, 492, 
01415       79, 0, 0, 0,
01416       0, 0, 0, 0 };
01417    static const int SpeexInBandSz[] = { 
01418       1, 1, 4, 4,
01419       4, 4, 4, 4,
01420       8, 8, 16, 16,
01421       32, 32, 64, 64 };
01422    int bit = 0;
01423    int cnt = 0;
01424    int off;
01425    unsigned char c;
01426 
01427    while ((len * 8 - bit) >= 5) {
01428       /* skip wideband frames */
01429       off = speex_get_wb_sz_at(data, len, bit);
01430       if (off < 0)  {
01431          ast_log(LOG_WARNING, "Had error while reading wideband frames for speex samples\n");
01432          break;
01433       }
01434       bit += off;
01435 
01436       if ((len * 8 - bit) < 5)
01437          break;
01438 
01439       /* get control bits */
01440       c = get_n_bits_at(data, 5, bit);
01441       bit += 5;
01442 
01443       if (c == 15) { 
01444          /* terminator */
01445          break; 
01446       } else if (c == 14) {
01447          /* in-band signal; next 4 bits contain signal id */
01448          c = get_n_bits_at(data, 4, bit);
01449          bit += 4;
01450          bit += SpeexInBandSz[c];
01451       } else if (c == 13) {
01452          /* user in-band; next 4 bits contain msg len */
01453          c = get_n_bits_at(data, 4, bit);
01454          bit += 4;
01455          /* after which it's 5-bit signal id + c bytes of data */
01456          bit += 5 + c * 8;
01457       } else if (c > 8) {
01458          /* unknown */
01459          ast_log(LOG_WARNING, "Unknown speex control frame %d\n", c);
01460          break;
01461       } else {
01462          /* skip number bits for submode (less the 5 control bits) */
01463          bit += SpeexSubModeSz[c] - 5;
01464          cnt += 160; /* new frame */
01465       }
01466    }
01467    return cnt;
01468 }
01469 
01470 int ast_codec_get_samples(struct ast_frame *f)
01471 {
01472    int samples = 0;
01473    char tmp[64];
01474 
01475    switch (f->subclass.codec) {
01476    case AST_FORMAT_SPEEX:
01477       samples = speex_samples(f->data.ptr, f->datalen);
01478       break;
01479    case AST_FORMAT_SPEEX16:
01480       samples = 2 * speex_samples(f->data.ptr, f->datalen);
01481       break;
01482    case AST_FORMAT_G723_1:
01483       samples = g723_samples(f->data.ptr, f->datalen);
01484       break;
01485    case AST_FORMAT_ILBC:
01486       samples = 240 * (f->datalen / 50);
01487       break;
01488    case AST_FORMAT_GSM:
01489       samples = 160 * (f->datalen / 33);
01490       break;
01491    case AST_FORMAT_G729A:
01492       samples = f->datalen * 8;
01493       break;
01494    case AST_FORMAT_SLINEAR:
01495    case AST_FORMAT_SLINEAR16:
01496       samples = f->datalen / 2;
01497       break;
01498    case AST_FORMAT_LPC10:
01499       /* assumes that the RTP packet contains one LPC10 frame */
01500       samples = 22 * 8;
01501       samples += (((char *)(f->data.ptr))[7] & 0x1) * 8;
01502       break;
01503    case AST_FORMAT_ULAW:
01504    case AST_FORMAT_ALAW:
01505    case AST_FORMAT_TESTLAW:
01506       samples = f->datalen;
01507       break;
01508    case AST_FORMAT_G722:
01509    case AST_FORMAT_ADPCM:
01510    case AST_FORMAT_G726:
01511    case AST_FORMAT_G726_AAL2:
01512       samples = f->datalen * 2;
01513       break;
01514    case AST_FORMAT_SIREN7:
01515       /* 16,000 samples per second at 32kbps is 4,000 bytes per second */
01516       samples = f->datalen * (16000 / 4000);
01517       break;
01518    case AST_FORMAT_SIREN14:
01519       /* 32,000 samples per second at 48kbps is 6,000 bytes per second */
01520       samples = (int) f->datalen * ((float) 32000 / 6000);
01521       break;
01522    case AST_FORMAT_G719:
01523       /* 48,000 samples per second at 64kbps is 8,000 bytes per second */
01524       samples = (int) f->datalen * ((float) 48000 / 8000);
01525       break;
01526    default:
01527       ast_log(LOG_WARNING, "Unable to calculate samples for format %s\n", ast_getformatname_multiple(tmp, sizeof(tmp), f->subclass.codec));
01528    }
01529    return samples;
01530 }
01531 
01532 int ast_codec_get_len(format_t format, int samples)
01533 {
01534    int len = 0;
01535 
01536    /* XXX Still need speex, and lpc10 XXX */ 
01537    switch(format) {
01538    case AST_FORMAT_G723_1:
01539       len = (samples / 240) * 20;
01540       break;
01541    case AST_FORMAT_ILBC:
01542       len = (samples / 240) * 50;
01543       break;
01544    case AST_FORMAT_GSM:
01545       len = (samples / 160) * 33;
01546       break;
01547    case AST_FORMAT_G729A:
01548       len = samples / 8;
01549       break;
01550    case AST_FORMAT_SLINEAR:
01551    case AST_FORMAT_SLINEAR16:
01552       len = samples * 2;
01553       break;
01554    case AST_FORMAT_ULAW:
01555    case AST_FORMAT_ALAW:
01556    case AST_FORMAT_TESTLAW:
01557       len = samples;
01558       break;
01559    case AST_FORMAT_G722:
01560    case AST_FORMAT_ADPCM:
01561    case AST_FORMAT_G726:
01562    case AST_FORMAT_G726_AAL2:
01563       len = samples / 2;
01564       break;
01565    case AST_FORMAT_SIREN7:
01566       /* 16,000 samples per second at 32kbps is 4,000 bytes per second */
01567       len = samples / (16000 / 4000);
01568       break;
01569    case AST_FORMAT_SIREN14:
01570       /* 32,000 samples per second at 48kbps is 6,000 bytes per second */
01571       len = (int) samples / ((float) 32000 / 6000);
01572       break;
01573    case AST_FORMAT_G719:
01574       /* 48,000 samples per second at 64kbps is 8,000 bytes per second */
01575       len = (int) samples / ((float) 48000 / 8000);
01576       break;
01577    default:
01578       ast_log(LOG_WARNING, "Unable to calculate sample length for format %s\n", ast_getformatname(format));
01579    }
01580 
01581    return len;
01582 }
01583 
01584 int ast_frame_adjust_volume(struct ast_frame *f, int adjustment)
01585 {
01586    int count;
01587    short *fdata = f->data.ptr;
01588    short adjust_value = abs(adjustment);
01589 
01590    if ((f->frametype != AST_FRAME_VOICE) || (f->subclass.codec != AST_FORMAT_SLINEAR))
01591       return -1;
01592 
01593    if (!adjustment)
01594       return 0;
01595 
01596    for (count = 0; count < f->samples; count++) {
01597       if (adjustment > 0) {
01598          ast_slinear_saturated_multiply(&fdata[count], &adjust_value);
01599       } else if (adjustment < 0) {
01600          ast_slinear_saturated_divide(&fdata[count], &adjust_value);
01601       }
01602    }
01603 
01604    return 0;
01605 }
01606 
01607 int ast_frame_slinear_sum(struct ast_frame *f1, struct ast_frame *f2)
01608 {
01609    int count;
01610    short *data1, *data2;
01611 
01612    if ((f1->frametype != AST_FRAME_VOICE) || (f1->subclass.codec != AST_FORMAT_SLINEAR))
01613       return -1;
01614 
01615    if ((f2->frametype != AST_FRAME_VOICE) || (f2->subclass.codec != AST_FORMAT_SLINEAR))
01616       return -1;
01617 
01618    if (f1->samples != f2->samples)
01619       return -1;
01620 
01621    for (count = 0, data1 = f1->data.ptr, data2 = f2->data.ptr;
01622         count < f1->samples;
01623         count++, data1++, data2++)
01624       ast_slinear_saturated_add(data1, data2);
01625 
01626    return 0;
01627 }
01628 
01629 int ast_frame_clear(struct ast_frame *frame)
01630 {
01631    struct ast_frame *next;
01632 
01633    for (next = AST_LIST_NEXT(frame, frame_list);
01634        frame;
01635        frame = next, next = frame ? AST_LIST_NEXT(frame, frame_list) : NULL) {
01636       memset(frame->data.ptr, 0, frame->datalen);
01637    }
01638    return 0;
01639 }

Generated on 7 Sep 2017 for Asterisk - The Open Source Telephony Project by  doxygen 1.6.1