Wed Aug 18 22:33:52 2010

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: 243246 $")
00029 
00030 #include "asterisk/_private.h"
00031 #include "asterisk/lock.h"
00032 #include "asterisk/frame.h"
00033 #include "asterisk/channel.h"
00034 #include "asterisk/cli.h"
00035 #include "asterisk/term.h"
00036 #include "asterisk/utils.h"
00037 #include "asterisk/threadstorage.h"
00038 #include "asterisk/linkedlists.h"
00039 #include "asterisk/translate.h"
00040 #include "asterisk/dsp.h"
00041 #include "asterisk/file.h"
00042 
00043 #if !defined(LOW_MEMORY)
00044 static void frame_cache_cleanup(void *data);
00045 
00046 /*! \brief A per-thread cache of frame headers */
00047 AST_THREADSTORAGE_CUSTOM(frame_cache, NULL, frame_cache_cleanup);
00048 
00049 /*! 
00050  * \brief Maximum ast_frame cache size
00051  *
00052  * In most cases where the frame header cache will be useful, the size
00053  * of the cache will stay very small.  However, it is not always the case that
00054  * the same thread that allocates the frame will be the one freeing them, so
00055  * sometimes a thread will never have any frames in its cache, or the cache
00056  * will never be pulled from.  For the latter case, we limit the maximum size. 
00057  */ 
00058 #define FRAME_CACHE_MAX_SIZE  10
00059 
00060 /*! \brief This is just so ast_frames, a list head struct for holding a list of
00061  *  ast_frame structures, is defined. */
00062 AST_LIST_HEAD_NOLOCK(ast_frames, ast_frame);
00063 
00064 struct ast_frame_cache {
00065    struct ast_frames list;
00066    size_t size;
00067 };
00068 #endif
00069 
00070 #define SMOOTHER_SIZE 8000
00071 
00072 enum frame_type {
00073    TYPE_HIGH,     /* 0x0 */
00074    TYPE_LOW,      /* 0x1 */
00075    TYPE_SILENCE,  /* 0x2 */
00076    TYPE_DONTSEND  /* 0x3 */
00077 };
00078 
00079 #define TYPE_MASK 0x3
00080 
00081 struct ast_smoother {
00082    int size;
00083    int format;
00084    int flags;
00085    float samplesperbyte;
00086    unsigned int opt_needs_swap:1;
00087    struct ast_frame f;
00088    struct timeval delivery;
00089    char data[SMOOTHER_SIZE];
00090    char framedata[SMOOTHER_SIZE + AST_FRIENDLY_OFFSET];
00091    struct ast_frame *opt;
00092    int len;
00093 };
00094 
00095 /*! \brief Definition of supported media formats (codecs) */
00096 static struct ast_format_list AST_FORMAT_LIST[] = {
00097    { AST_FORMAT_G723_1 , "g723", 8000, "G.723.1", 20, 30, 300, 30, 30 },                                  /*!< G723.1 */
00098    { AST_FORMAT_GSM, "gsm", 8000, "GSM", 33, 20, 300, 20, 20 },                                           /*!< codec_gsm.c */
00099    { AST_FORMAT_ULAW, "ulaw", 8000, "G.711 u-law", 80, 10, 150, 10, 20 },                                 /*!< codec_ulaw.c */
00100    { AST_FORMAT_ALAW, "alaw", 8000, "G.711 A-law", 80, 10, 150, 10, 20 },                                 /*!< codec_alaw.c */
00101    { AST_FORMAT_G726, "g726", 8000, "G.726 RFC3551", 40, 10, 300, 10, 20 },                               /*!< codec_g726.c */
00102    { AST_FORMAT_ADPCM, "adpcm" , 8000, "ADPCM", 40, 10, 300, 10, 20 },                                    /*!< codec_adpcm.c */
00103    { AST_FORMAT_SLINEAR, "slin", 8000, "16 bit Signed Linear PCM", 160, 10, 70, 10, 20, AST_SMOOTHER_FLAG_BE }, /*!< Signed linear */
00104    { AST_FORMAT_LPC10, "lpc10", 8000, "LPC10", 7, 20, 20, 20, 20 },                                       /*!< codec_lpc10.c */ 
00105    { AST_FORMAT_G729A, "g729", 8000, "G.729A", 10, 10, 230, 10, 20, AST_SMOOTHER_FLAG_G729 },             /*!< Binary commercial distribution */
00106    { AST_FORMAT_SPEEX, "speex", 8000, "SpeeX", 10, 10, 60, 10, 20 },                                      /*!< codec_speex.c */
00107    { AST_FORMAT_ILBC, "ilbc", 8000, "iLBC", 50, 30, 30, 30, 30 },                                         /*!< codec_ilbc.c */ /* inc=30ms - workaround */
00108    { AST_FORMAT_G726_AAL2, "g726aal2", 8000, "G.726 AAL2", 40, 10, 300, 10, 20 },                         /*!< codec_g726.c */
00109    { AST_FORMAT_G722, "g722", 16000, "G722", 80, 10, 150, 10, 20 },                                       /*!< codec_g722.c */
00110    { AST_FORMAT_SLINEAR16, "slin16", 16000, "16 bit Signed Linear PCM (16kHz)", 320, 10, 70, 10, 20, AST_SMOOTHER_FLAG_BE },    /*!< Signed linear (16kHz) */
00111    { AST_FORMAT_JPEG, "jpeg", 0, "JPEG image"},                                                           /*!< See format_jpeg.c */
00112    { AST_FORMAT_PNG, "png", 0, "PNG image"},                                                              /*!< PNG Image format */
00113    { AST_FORMAT_H261, "h261", 0, "H.261 Video" },                                                         /*!< H.261 Video Passthrough */
00114    { AST_FORMAT_H263, "h263", 0, "H.263 Video" },                                                         /*!< H.263 Passthrough support, see format_h263.c */
00115    { AST_FORMAT_H263_PLUS, "h263p", 0, "H.263+ Video" },                                                  /*!< H.263plus passthrough support See format_h263.c */
00116    { AST_FORMAT_H264, "h264", 0, "H.264 Video" },                                                         /*!< Passthrough support, see format_h263.c */
00117    { AST_FORMAT_MP4_VIDEO, "mpeg4", 0, "MPEG4 Video" },                                                   /*!< Passthrough support for MPEG4 */
00118    { AST_FORMAT_T140RED, "red", 1, "T.140 Realtime Text with redundancy"},                                 /*!< Redundant T.140 Realtime Text */
00119    { AST_FORMAT_T140, "t140", 0, "Passthrough T.140 Realtime Text" },                                     /*!< Passthrough support for T.140 Realtime Text */
00120 };
00121 
00122 struct ast_frame ast_null_frame = { AST_FRAME_NULL, };
00123 
00124 static int smoother_frame_feed(struct ast_smoother *s, struct ast_frame *f, int swap)
00125 {
00126    if (s->flags & AST_SMOOTHER_FLAG_G729) {
00127       if (s->len % 10) {
00128          ast_log(LOG_NOTICE, "Dropping extra frame of G.729 since we already have a VAD frame at the end\n");
00129          return 0;
00130       }
00131    }
00132    if (swap) {
00133       ast_swapcopy_samples(s->data + s->len, f->data.ptr, f->samples);
00134    } else {
00135       memcpy(s->data + s->len, f->data.ptr, f->datalen);
00136    }
00137    /* If either side is empty, reset the delivery time */
00138    if (!s->len || ast_tvzero(f->delivery) || ast_tvzero(s->delivery)) { /* XXX really ? */
00139       s->delivery = f->delivery;
00140    }
00141    s->len += f->datalen;
00142 
00143    return 0;
00144 }
00145 
00146 void ast_smoother_reset(struct ast_smoother *s, int bytes)
00147 {
00148    memset(s, 0, sizeof(*s));
00149    s->size = bytes;
00150 }
00151 
00152 void ast_smoother_reconfigure(struct ast_smoother *s, int bytes)
00153 {
00154    /* if there is no change, then nothing to do */
00155    if (s->size == bytes) {
00156       return;
00157    }
00158    /* set the new desired output size */
00159    s->size = bytes;
00160    /* if there is no 'optimized' frame in the smoother,
00161     *   then there is nothing left to do
00162     */
00163    if (!s->opt) {
00164       return;
00165    }
00166    /* there is an 'optimized' frame here at the old size,
00167     * but it must now be put into the buffer so the data
00168     * can be extracted at the new size
00169     */
00170    smoother_frame_feed(s, s->opt, s->opt_needs_swap);
00171    s->opt = NULL;
00172 }
00173 
00174 struct ast_smoother *ast_smoother_new(int size)
00175 {
00176    struct ast_smoother *s;
00177    if (size < 1)
00178       return NULL;
00179    if ((s = ast_malloc(sizeof(*s))))
00180       ast_smoother_reset(s, size);
00181    return s;
00182 }
00183 
00184 int ast_smoother_get_flags(struct ast_smoother *s)
00185 {
00186    return s->flags;
00187 }
00188 
00189 void ast_smoother_set_flags(struct ast_smoother *s, int flags)
00190 {
00191    s->flags = flags;
00192 }
00193 
00194 int ast_smoother_test_flag(struct ast_smoother *s, int flag)
00195 {
00196    return (s->flags & flag);
00197 }
00198 
00199 int __ast_smoother_feed(struct ast_smoother *s, struct ast_frame *f, int swap)
00200 {
00201    if (f->frametype != AST_FRAME_VOICE) {
00202       ast_log(LOG_WARNING, "Huh?  Can't smooth a non-voice frame!\n");
00203       return -1;
00204    }
00205    if (!s->format) {
00206       s->format = f->subclass;
00207       s->samplesperbyte = (float)f->samples / (float)f->datalen;
00208    } else if (s->format != f->subclass) {
00209       ast_log(LOG_WARNING, "Smoother was working on %d format frames, now trying to feed %d?\n", s->format, f->subclass);
00210       return -1;
00211    }
00212    if (s->len + f->datalen > SMOOTHER_SIZE) {
00213       ast_log(LOG_WARNING, "Out of smoother space\n");
00214       return -1;
00215    }
00216    if (((f->datalen == s->size) ||
00217         ((f->datalen < 10) && (s->flags & AST_SMOOTHER_FLAG_G729))) &&
00218        !s->opt &&
00219        !s->len &&
00220        (f->offset >= AST_MIN_OFFSET)) {
00221       /* Optimize by sending the frame we just got
00222          on the next read, thus eliminating the douple
00223          copy */
00224       if (swap)
00225          ast_swapcopy_samples(f->data.ptr, f->data.ptr, f->samples);
00226       s->opt = f;
00227       s->opt_needs_swap = swap ? 1 : 0;
00228       return 0;
00229    }
00230 
00231    return smoother_frame_feed(s, f, swap);
00232 }
00233 
00234 struct ast_frame *ast_smoother_read(struct ast_smoother *s)
00235 {
00236    struct ast_frame *opt;
00237    int len;
00238 
00239    /* IF we have an optimization frame, send it */
00240    if (s->opt) {
00241       if (s->opt->offset < AST_FRIENDLY_OFFSET)
00242          ast_log(LOG_WARNING, "Returning a frame of inappropriate offset (%d).\n",
00243                      s->opt->offset);
00244       opt = s->opt;
00245       s->opt = NULL;
00246       return opt;
00247    }
00248 
00249    /* Make sure we have enough data */
00250    if (s->len < s->size) {
00251       /* Or, if this is a G.729 frame with VAD on it, send it immediately anyway */
00252       if (!((s->flags & AST_SMOOTHER_FLAG_G729) && (s->len % 10)))
00253          return NULL;
00254    }
00255    len = s->size;
00256    if (len > s->len)
00257       len = s->len;
00258    /* Make frame */
00259    s->f.frametype = AST_FRAME_VOICE;
00260    s->f.subclass = s->format;
00261    s->f.data.ptr = s->framedata + AST_FRIENDLY_OFFSET;
00262    s->f.offset = AST_FRIENDLY_OFFSET;
00263    s->f.datalen = len;
00264    /* Samples will be improper given VAD, but with VAD the concept really doesn't even exist */
00265    s->f.samples = len * s->samplesperbyte;   /* XXX rounding */
00266    s->f.delivery = s->delivery;
00267    /* Fill Data */
00268    memcpy(s->f.data.ptr, s->data, len);
00269    s->len -= len;
00270    /* Move remaining data to the front if applicable */
00271    if (s->len) {
00272       /* In principle this should all be fine because if we are sending
00273          G.729 VAD, the next timestamp will take over anyawy */
00274       memmove(s->data, s->data + len, s->len);
00275       if (!ast_tvzero(s->delivery)) {
00276          /* If we have delivery time, increment it, otherwise, leave it at 0 */
00277          s->delivery = ast_tvadd(s->delivery, ast_samp2tv(s->f.samples, ast_format_rate(s->format)));
00278       }
00279    }
00280    /* Return frame */
00281    return &s->f;
00282 }
00283 
00284 void ast_smoother_free(struct ast_smoother *s)
00285 {
00286    ast_free(s);
00287 }
00288 
00289 static struct ast_frame *ast_frame_header_new(void)
00290 {
00291    struct ast_frame *f;
00292 
00293 #if !defined(LOW_MEMORY)
00294    struct ast_frame_cache *frames;
00295 
00296    if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames)))) {
00297       if ((f = AST_LIST_REMOVE_HEAD(&frames->list, frame_list))) {
00298          size_t mallocd_len = f->mallocd_hdr_len;
00299          memset(f, 0, sizeof(*f));
00300          f->mallocd_hdr_len = mallocd_len;
00301          f->mallocd = AST_MALLOCD_HDR;
00302          frames->size--;
00303          return f;
00304       }
00305    }
00306    if (!(f = ast_calloc_cache(1, sizeof(*f))))
00307       return NULL;
00308 #else
00309    if (!(f = ast_calloc(1, sizeof(*f))))
00310       return NULL;
00311 #endif
00312 
00313    f->mallocd_hdr_len = sizeof(*f);
00314    
00315    return f;
00316 }
00317 
00318 #if !defined(LOW_MEMORY)
00319 static void frame_cache_cleanup(void *data)
00320 {
00321    struct ast_frame_cache *frames = data;
00322    struct ast_frame *f;
00323 
00324    while ((f = AST_LIST_REMOVE_HEAD(&frames->list, frame_list)))
00325       ast_free(f);
00326    
00327    ast_free(frames);
00328 }
00329 #endif
00330 
00331 static void __frame_free(struct ast_frame *fr, int cache)
00332 {
00333    if (!fr->mallocd)
00334       return;
00335 
00336 #if !defined(LOW_MEMORY)
00337    if (cache && fr->mallocd == AST_MALLOCD_HDR) {
00338       /* Cool, only the header is malloc'd, let's just cache those for now 
00339        * to keep things simple... */
00340       struct ast_frame_cache *frames;
00341 
00342       if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames))) &&
00343           (frames->size < FRAME_CACHE_MAX_SIZE)) {
00344          AST_LIST_INSERT_HEAD(&frames->list, fr, frame_list);
00345          frames->size++;
00346          return;
00347       }
00348    }
00349 #endif
00350    
00351    if (fr->mallocd & AST_MALLOCD_DATA) {
00352       if (fr->data.ptr) 
00353          ast_free(fr->data.ptr - fr->offset);
00354    }
00355    if (fr->mallocd & AST_MALLOCD_SRC) {
00356       if (fr->src)
00357          ast_free((void *) fr->src);
00358    }
00359    if (fr->mallocd & AST_MALLOCD_HDR) {
00360       ast_free(fr);
00361    }
00362 }
00363 
00364 
00365 void ast_frame_free(struct ast_frame *frame, int cache)
00366 {
00367    struct ast_frame *next;
00368 
00369    for (next = AST_LIST_NEXT(frame, frame_list);
00370         frame;
00371         frame = next, next = frame ? AST_LIST_NEXT(frame, frame_list) : NULL) {
00372       __frame_free(frame, cache);
00373    }
00374 }
00375 
00376 /*!
00377  * \brief 'isolates' a frame by duplicating non-malloc'ed components
00378  * (header, src, data).
00379  * On return all components are malloc'ed
00380  */
00381 struct ast_frame *ast_frisolate(struct ast_frame *fr)
00382 {
00383    struct ast_frame *out;
00384    void *newdata;
00385 
00386    /* if none of the existing frame is malloc'd, let ast_frdup() do it
00387       since it is more efficient
00388    */
00389    if (fr->mallocd == 0) {
00390       return ast_frdup(fr);
00391    }
00392 
00393    /* if everything is already malloc'd, we are done */
00394    if ((fr->mallocd & (AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA)) ==
00395        (AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA)) {
00396       return fr;
00397    }
00398 
00399    if (!(fr->mallocd & AST_MALLOCD_HDR)) {
00400       /* Allocate a new header if needed */
00401       if (!(out = ast_frame_header_new())) {
00402          return NULL;
00403       }
00404       out->frametype = fr->frametype;
00405       out->subclass = fr->subclass;
00406       out->datalen = fr->datalen;
00407       out->samples = fr->samples;
00408       out->offset = fr->offset;
00409       /* Copy the timing data */
00410       ast_copy_flags(out, fr, AST_FRFLAG_HAS_TIMING_INFO);
00411       if (ast_test_flag(fr, AST_FRFLAG_HAS_TIMING_INFO)) {
00412          out->ts = fr->ts;
00413          out->len = fr->len;
00414          out->seqno = fr->seqno;
00415       }
00416    } else {
00417       out = fr;
00418    }
00419    
00420    if (!(fr->mallocd & AST_MALLOCD_SRC) && fr->src) {
00421       if (!(out->src = ast_strdup(fr->src))) {
00422          if (out != fr) {
00423             ast_free(out);
00424          }
00425          return NULL;
00426       }
00427    } else {
00428       out->src = fr->src;
00429       fr->src = NULL;
00430       fr->mallocd &= ~AST_MALLOCD_SRC;
00431    }
00432    
00433    if (!(fr->mallocd & AST_MALLOCD_DATA))  {
00434       if (!fr->datalen) {
00435          out->data.uint32 = fr->data.uint32;
00436          out->mallocd = AST_MALLOCD_HDR | AST_MALLOCD_SRC;
00437          return out;
00438       }
00439       if (!(newdata = ast_malloc(fr->datalen + AST_FRIENDLY_OFFSET))) {
00440          if (out->src != fr->src) {
00441             ast_free((void *) out->src);
00442          }
00443          if (out != fr) {
00444             ast_free(out);
00445          }
00446          return NULL;
00447       }
00448       newdata += AST_FRIENDLY_OFFSET;
00449       out->offset = AST_FRIENDLY_OFFSET;
00450       out->datalen = fr->datalen;
00451       memcpy(newdata, fr->data.ptr, fr->datalen);
00452       out->data.ptr = newdata;
00453    } else {
00454       out->data = fr->data;
00455       memset(&fr->data, 0, sizeof(fr->data));
00456       fr->mallocd &= ~AST_MALLOCD_DATA;
00457    }
00458 
00459    out->mallocd = AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA;
00460    
00461    return out;
00462 }
00463 
00464 struct ast_frame *ast_frdup(const struct ast_frame *f)
00465 {
00466    struct ast_frame *out = NULL;
00467    int len, srclen = 0;
00468    void *buf = NULL;
00469 
00470 #if !defined(LOW_MEMORY)
00471    struct ast_frame_cache *frames;
00472 #endif
00473 
00474    /* Start with standard stuff */
00475    len = sizeof(*out) + AST_FRIENDLY_OFFSET + f->datalen;
00476    /* If we have a source, add space for it */
00477    /*
00478     * XXX Watch out here - if we receive a src which is not terminated
00479     * properly, we can be easily attacked. Should limit the size we deal with.
00480     */
00481    if (f->src)
00482       srclen = strlen(f->src);
00483    if (srclen > 0)
00484       len += srclen + 1;
00485    
00486 #if !defined(LOW_MEMORY)
00487    if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames)))) {
00488       AST_LIST_TRAVERSE_SAFE_BEGIN(&frames->list, out, frame_list) {
00489          if (out->mallocd_hdr_len >= len) {
00490             size_t mallocd_len = out->mallocd_hdr_len;
00491 
00492             AST_LIST_REMOVE_CURRENT(frame_list);
00493             memset(out, 0, sizeof(*out));
00494             out->mallocd_hdr_len = mallocd_len;
00495             buf = out;
00496             frames->size--;
00497             break;
00498          }
00499       }
00500       AST_LIST_TRAVERSE_SAFE_END;
00501    }
00502 #endif
00503 
00504    if (!buf) {
00505       if (!(buf = ast_calloc_cache(1, len)))
00506          return NULL;
00507       out = buf;
00508       out->mallocd_hdr_len = len;
00509    }
00510 
00511    out->frametype = f->frametype;
00512    out->subclass = f->subclass;
00513    out->datalen = f->datalen;
00514    out->samples = f->samples;
00515    out->delivery = f->delivery;
00516    /* Set us as having malloc'd header only, so it will eventually
00517       get freed. */
00518    out->mallocd = AST_MALLOCD_HDR;
00519    out->offset = AST_FRIENDLY_OFFSET;
00520    if (out->datalen) {
00521       out->data.ptr = buf + sizeof(*out) + AST_FRIENDLY_OFFSET;
00522       memcpy(out->data.ptr, f->data.ptr, out->datalen);  
00523    } else {
00524       out->data.uint32 = f->data.uint32;
00525    }
00526    if (srclen > 0) {
00527       /* This may seem a little strange, but it's to avoid a gcc (4.2.4) compiler warning */
00528       char *src;
00529       out->src = buf + sizeof(*out) + AST_FRIENDLY_OFFSET + f->datalen;
00530       src = (char *) out->src;
00531       /* Must have space since we allocated for it */
00532       strcpy(src, f->src);
00533    }
00534    ast_copy_flags(out, f, AST_FRFLAG_HAS_TIMING_INFO);
00535    out->ts = f->ts;
00536    out->len = f->len;
00537    out->seqno = f->seqno;
00538    return out;
00539 }
00540 
00541 void ast_swapcopy_samples(void *dst, const void *src, int samples)
00542 {
00543    int i;
00544    unsigned short *dst_s = dst;
00545    const unsigned short *src_s = src;
00546 
00547    for (i = 0; i < samples; i++)
00548       dst_s[i] = (src_s[i]<<8) | (src_s[i]>>8);
00549 }
00550 
00551 
00552 struct ast_format_list *ast_get_format_list_index(int idx) 
00553 {
00554    return &AST_FORMAT_LIST[idx];
00555 }
00556 
00557 struct ast_format_list *ast_get_format_list(size_t *size) 
00558 {
00559    *size = ARRAY_LEN(AST_FORMAT_LIST);
00560    return AST_FORMAT_LIST;
00561 }
00562 
00563 char* ast_getformatname(int format)
00564 {
00565    int x;
00566    char *ret = "unknown";
00567    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00568       if (AST_FORMAT_LIST[x].bits == format) {
00569          ret = AST_FORMAT_LIST[x].name;
00570          break;
00571       }
00572    }
00573    return ret;
00574 }
00575 
00576 char *ast_getformatname_multiple(char *buf, size_t size, int format)
00577 {
00578    int x;
00579    unsigned len;
00580    char *start, *end = buf;
00581 
00582    if (!size)
00583       return buf;
00584    snprintf(end, size, "0x%x (", format);
00585    len = strlen(end);
00586    end += len;
00587    size -= len;
00588    start = end;
00589    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00590       if (AST_FORMAT_LIST[x].bits & format) {
00591          snprintf(end, size,"%s|",AST_FORMAT_LIST[x].name);
00592          len = strlen(end);
00593          end += len;
00594          size -= len;
00595       }
00596    }
00597    if (start == end)
00598       ast_copy_string(start, "nothing)", size);
00599    else if (size > 1)
00600       *(end -1) = ')';
00601    return buf;
00602 }
00603 
00604 static struct ast_codec_alias_table {
00605    char *alias;
00606    char *realname;
00607 } ast_codec_alias_table[] = {
00608    { "slinear", "slin"},
00609    { "slinear16", "slin16"},
00610    { "g723.1", "g723"},
00611 };
00612 
00613 static const char *ast_expand_codec_alias(const char *in)
00614 {
00615    int x;
00616 
00617    for (x = 0; x < ARRAY_LEN(ast_codec_alias_table); x++) {
00618       if (!strcmp(in,ast_codec_alias_table[x].alias))
00619          return ast_codec_alias_table[x].realname;
00620    }
00621    return in;
00622 }
00623 
00624 int ast_getformatbyname(const char *name)
00625 {
00626    int x, all, format = 0;
00627 
00628    all = strcasecmp(name, "all") ? 0 : 1;
00629    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00630       if (all || 
00631            !strcasecmp(AST_FORMAT_LIST[x].name,name) ||
00632            !strcasecmp(AST_FORMAT_LIST[x].name, ast_expand_codec_alias(name))) {
00633          format |= AST_FORMAT_LIST[x].bits;
00634          if (!all)
00635             break;
00636       }
00637    }
00638 
00639    return format;
00640 }
00641 
00642 char *ast_codec2str(int codec)
00643 {
00644    int x;
00645    char *ret = "unknown";
00646    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00647       if (AST_FORMAT_LIST[x].bits == codec) {
00648          ret = AST_FORMAT_LIST[x].desc;
00649          break;
00650       }
00651    }
00652    return ret;
00653 }
00654 
00655 static char *show_codecs(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00656 {
00657    int i, found=0;
00658    char hex[25];
00659 
00660    switch (cmd) {
00661    case CLI_INIT:
00662       e->command = "core show codecs [audio|video|image]";
00663       e->usage = 
00664          "Usage: core show codecs [audio|video|image]\n"
00665          "       Displays codec mapping\n";
00666       return NULL;
00667    case CLI_GENERATE:
00668       return NULL;
00669    }
00670    
00671    if ((a->argc < 3) || (a->argc > 4))
00672       return CLI_SHOWUSAGE;
00673 
00674    if (!ast_opt_dont_warn)
00675       ast_cli(a->fd, "Disclaimer: this command is for informational purposes only.\n"
00676             "\tIt does not indicate anything about your configuration.\n");
00677 
00678    ast_cli(a->fd, "%11s %9s %10s   TYPE   %8s   %s\n","INT","BINARY","HEX","NAME","DESC");
00679    ast_cli(a->fd, "--------------------------------------------------------------------------------\n");
00680    if ((a->argc == 3) || (!strcasecmp(a->argv[3],"audio"))) {
00681       found = 1;
00682       for (i=0;i<13;i++) {
00683          snprintf(hex,25,"(0x%x)",1<<i);
00684          ast_cli(a->fd, "%11u (1 << %2d) %10s  audio   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00685       }
00686    }
00687 
00688    if ((a->argc == 3) || (!strcasecmp(a->argv[3],"image"))) {
00689       found = 1;
00690       for (i=16;i<18;i++) {
00691          snprintf(hex,25,"(0x%x)",1<<i);
00692          ast_cli(a->fd, "%11u (1 << %2d) %10s  image   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00693       }
00694    }
00695 
00696    if ((a->argc == 3) || (!strcasecmp(a->argv[3],"video"))) {
00697       found = 1;
00698       for (i=18;i<22;i++) {
00699          snprintf(hex,25,"(0x%x)",1<<i);
00700          ast_cli(a->fd, "%11u (1 << %2d) %10s  video   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00701       }
00702    }
00703 
00704    if (!found)
00705       return CLI_SHOWUSAGE;
00706    else
00707       return CLI_SUCCESS;
00708 }
00709 
00710 static char *show_codec_n(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00711 {
00712    int codec, i, found=0;
00713 
00714    switch (cmd) {
00715    case CLI_INIT:
00716       e->command = "core show codec";
00717       e->usage = 
00718          "Usage: core show codec <number>\n"
00719          "       Displays codec mapping\n";
00720       return NULL;
00721    case CLI_GENERATE:
00722       return NULL;
00723    }
00724 
00725    if (a->argc != 4)
00726       return CLI_SHOWUSAGE;
00727 
00728    if (sscanf(a->argv[3], "%30d", &codec) != 1)
00729       return CLI_SHOWUSAGE;
00730 
00731    for (i = 0; i < 32; i++)
00732       if (codec & (1 << i)) {
00733          found = 1;
00734          ast_cli(a->fd, "%11u (1 << %2d)  %s\n",1 << i,i,ast_codec2str(1<<i));
00735       }
00736 
00737    if (!found)
00738       ast_cli(a->fd, "Codec %d not found\n", codec);
00739 
00740    return CLI_SUCCESS;
00741 }
00742 
00743 /*! Dump a frame for debugging purposes */
00744 void ast_frame_dump(const char *name, struct ast_frame *f, char *prefix)
00745 {
00746    const char noname[] = "unknown";
00747    char ftype[40] = "Unknown Frametype";
00748    char cft[80];
00749    char subclass[40] = "Unknown Subclass";
00750    char csub[80];
00751    char moreinfo[40] = "";
00752    char cn[60];
00753    char cp[40];
00754    char cmn[40];
00755    const char *message = "Unknown";
00756 
00757    if (!name)
00758       name = noname;
00759 
00760 
00761    if (!f) {
00762       ast_verbose("%s [ %s (NULL) ] [%s]\n", 
00763          term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00764          term_color(cft, "HANGUP", COLOR_BRRED, COLOR_BLACK, sizeof(cft)), 
00765          term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00766       return;
00767    }
00768    /* XXX We should probably print one each of voice and video when the format changes XXX */
00769    if (f->frametype == AST_FRAME_VOICE)
00770       return;
00771    if (f->frametype == AST_FRAME_VIDEO)
00772       return;
00773    switch(f->frametype) {
00774    case AST_FRAME_DTMF_BEGIN:
00775       strcpy(ftype, "DTMF Begin");
00776       subclass[0] = f->subclass;
00777       subclass[1] = '\0';
00778       break;
00779    case AST_FRAME_DTMF_END:
00780       strcpy(ftype, "DTMF End");
00781       subclass[0] = f->subclass;
00782       subclass[1] = '\0';
00783       break;
00784    case AST_FRAME_CONTROL:
00785       strcpy(ftype, "Control");
00786       switch(f->subclass) {
00787       case AST_CONTROL_HANGUP:
00788          strcpy(subclass, "Hangup");
00789          break;
00790       case AST_CONTROL_RING:
00791          strcpy(subclass, "Ring");
00792          break;
00793       case AST_CONTROL_RINGING:
00794          strcpy(subclass, "Ringing");
00795          break;
00796       case AST_CONTROL_ANSWER:
00797          strcpy(subclass, "Answer");
00798          break;
00799       case AST_CONTROL_BUSY:
00800          strcpy(subclass, "Busy");
00801          break;
00802       case AST_CONTROL_TAKEOFFHOOK:
00803          strcpy(subclass, "Take Off Hook");
00804          break;
00805       case AST_CONTROL_OFFHOOK:
00806          strcpy(subclass, "Line Off Hook");
00807          break;
00808       case AST_CONTROL_CONGESTION:
00809          strcpy(subclass, "Congestion");
00810          break;
00811       case AST_CONTROL_FLASH:
00812          strcpy(subclass, "Flash");
00813          break;
00814       case AST_CONTROL_WINK:
00815          strcpy(subclass, "Wink");
00816          break;
00817       case AST_CONTROL_OPTION:
00818          strcpy(subclass, "Option");
00819          break;
00820       case AST_CONTROL_RADIO_KEY:
00821          strcpy(subclass, "Key Radio");
00822          break;
00823       case AST_CONTROL_RADIO_UNKEY:
00824          strcpy(subclass, "Unkey Radio");
00825          break;
00826       case AST_CONTROL_HOLD:
00827          strcpy(subclass, "Hold");
00828          break;
00829       case AST_CONTROL_UNHOLD:
00830          strcpy(subclass, "Unhold");
00831          break;
00832       case AST_CONTROL_T38_PARAMETERS:
00833          if (f->datalen != sizeof(struct ast_control_t38_parameters)) {
00834             message = "Invalid";
00835          } else {
00836             struct ast_control_t38_parameters *parameters = f->data.ptr;
00837             enum ast_control_t38 state = parameters->request_response;
00838             if (state == AST_T38_REQUEST_NEGOTIATE)
00839                message = "Negotiation Requested";
00840             else if (state == AST_T38_REQUEST_TERMINATE)
00841                message = "Negotiation Request Terminated";
00842             else if (state == AST_T38_NEGOTIATED)
00843                message = "Negotiated";
00844             else if (state == AST_T38_TERMINATED)
00845                message = "Terminated";
00846             else if (state == AST_T38_REFUSED)
00847                message = "Refused";
00848          }
00849          snprintf(subclass, sizeof(subclass), "T38_Parameters/%s", message);
00850          break;
00851       case -1:
00852          strcpy(subclass, "Stop generators");
00853          break;
00854       default:
00855          snprintf(subclass, sizeof(subclass), "Unknown control '%d'", f->subclass);
00856       }
00857       break;
00858    case AST_FRAME_NULL:
00859       strcpy(ftype, "Null Frame");
00860       strcpy(subclass, "N/A");
00861       break;
00862    case AST_FRAME_IAX:
00863       /* Should never happen */
00864       strcpy(ftype, "IAX Specific");
00865       snprintf(subclass, sizeof(subclass), "IAX Frametype %d", f->subclass);
00866       break;
00867    case AST_FRAME_TEXT:
00868       strcpy(ftype, "Text");
00869       strcpy(subclass, "N/A");
00870       ast_copy_string(moreinfo, f->data.ptr, sizeof(moreinfo));
00871       break;
00872    case AST_FRAME_IMAGE:
00873       strcpy(ftype, "Image");
00874       snprintf(subclass, sizeof(subclass), "Image format %s\n", ast_getformatname(f->subclass));
00875       break;
00876    case AST_FRAME_HTML:
00877       strcpy(ftype, "HTML");
00878       switch(f->subclass) {
00879       case AST_HTML_URL:
00880          strcpy(subclass, "URL");
00881          ast_copy_string(moreinfo, f->data.ptr, sizeof(moreinfo));
00882          break;
00883       case AST_HTML_DATA:
00884          strcpy(subclass, "Data");
00885          break;
00886       case AST_HTML_BEGIN:
00887          strcpy(subclass, "Begin");
00888          break;
00889       case AST_HTML_END:
00890          strcpy(subclass, "End");
00891          break;
00892       case AST_HTML_LDCOMPLETE:
00893          strcpy(subclass, "Load Complete");
00894          break;
00895       case AST_HTML_NOSUPPORT:
00896          strcpy(subclass, "No Support");
00897          break;
00898       case AST_HTML_LINKURL:
00899          strcpy(subclass, "Link URL");
00900          ast_copy_string(moreinfo, f->data.ptr, sizeof(moreinfo));
00901          break;
00902       case AST_HTML_UNLINK:
00903          strcpy(subclass, "Unlink");
00904          break;
00905       case AST_HTML_LINKREJECT:
00906          strcpy(subclass, "Link Reject");
00907          break;
00908       default:
00909          snprintf(subclass, sizeof(subclass), "Unknown HTML frame '%d'\n", f->subclass);
00910          break;
00911       }
00912       break;
00913    case AST_FRAME_MODEM:
00914       strcpy(ftype, "Modem");
00915       switch (f->subclass) {
00916       case AST_MODEM_T38:
00917          strcpy(subclass, "T.38");
00918          break;
00919       case AST_MODEM_V150:
00920          strcpy(subclass, "V.150");
00921          break;
00922       default:
00923          snprintf(subclass, sizeof(subclass), "Unknown MODEM frame '%d'\n", f->subclass);
00924          break;
00925       }
00926       break;
00927    default:
00928       snprintf(ftype, sizeof(ftype), "Unknown Frametype '%d'", f->frametype);
00929    }
00930    if (!ast_strlen_zero(moreinfo))
00931       ast_verbose("%s [ TYPE: %s (%d) SUBCLASS: %s (%d) '%s' ] [%s]\n",  
00932              term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00933              term_color(cft, ftype, COLOR_BRRED, COLOR_BLACK, sizeof(cft)),
00934              f->frametype, 
00935              term_color(csub, subclass, COLOR_BRCYAN, COLOR_BLACK, sizeof(csub)),
00936              f->subclass, 
00937              term_color(cmn, moreinfo, COLOR_BRGREEN, COLOR_BLACK, sizeof(cmn)),
00938              term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00939    else
00940       ast_verbose("%s [ TYPE: %s (%d) SUBCLASS: %s (%d) ] [%s]\n",  
00941              term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00942              term_color(cft, ftype, COLOR_BRRED, COLOR_BLACK, sizeof(cft)),
00943              f->frametype, 
00944              term_color(csub, subclass, COLOR_BRCYAN, COLOR_BLACK, sizeof(csub)),
00945              f->subclass, 
00946              term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00947 }
00948 
00949 
00950 /* Builtin Asterisk CLI-commands for debugging */
00951 static struct ast_cli_entry my_clis[] = {
00952    AST_CLI_DEFINE(show_codecs, "Displays a list of codecs"),
00953    AST_CLI_DEFINE(show_codec_n, "Shows a specific codec"),
00954 };
00955 
00956 int init_framer(void)
00957 {
00958    ast_cli_register_multiple(my_clis, sizeof(my_clis) / sizeof(struct ast_cli_entry));
00959    return 0;   
00960 }
00961 
00962 void ast_codec_pref_convert(struct ast_codec_pref *pref, char *buf, size_t size, int right) 
00963 {
00964    int x, differential = (int) 'A', mem;
00965    char *from, *to;
00966 
00967    if (right) {
00968       from = pref->order;
00969       to = buf;
00970       mem = size;
00971    } else {
00972       to = pref->order;
00973       from = buf;
00974       mem = 32;
00975    }
00976 
00977    memset(to, 0, mem);
00978    for (x = 0; x < 32 ; x++) {
00979       if (!from[x])
00980          break;
00981       to[x] = right ? (from[x] + differential) : (from[x] - differential);
00982    }
00983 }
00984 
00985 int ast_codec_pref_string(struct ast_codec_pref *pref, char *buf, size_t size) 
00986 {
00987    int x, codec; 
00988    size_t total_len, slen;
00989    char *formatname;
00990    
00991    memset(buf,0,size);
00992    total_len = size;
00993    buf[0] = '(';
00994    total_len--;
00995    for(x = 0; x < 32 ; x++) {
00996       if (total_len <= 0)
00997          break;
00998       if (!(codec = ast_codec_pref_index(pref,x)))
00999          break;
01000       if ((formatname = ast_getformatname(codec))) {
01001          slen = strlen(formatname);
01002          if (slen > total_len)
01003             break;
01004          strncat(buf, formatname, total_len - 1); /* safe */
01005          total_len -= slen;
01006       }
01007       if (total_len && x < 31 && ast_codec_pref_index(pref , x + 1)) {
01008          strncat(buf, "|", total_len - 1); /* safe */
01009          total_len--;
01010       }
01011    }
01012    if (total_len) {
01013       strncat(buf, ")", total_len - 1); /* safe */
01014       total_len--;
01015    }
01016 
01017    return size - total_len;
01018 }
01019 
01020 int ast_codec_pref_index(struct ast_codec_pref *pref, int idx)
01021 {
01022    int slot = 0;
01023 
01024    if ((idx >= 0) && (idx < sizeof(pref->order))) {
01025       slot = pref->order[idx];
01026    }
01027 
01028    return slot ? AST_FORMAT_LIST[slot - 1].bits : 0;
01029 }
01030 
01031 /*! \brief Remove codec from pref list */
01032 void ast_codec_pref_remove(struct ast_codec_pref *pref, int format)
01033 {
01034    struct ast_codec_pref oldorder;
01035    int x, y = 0;
01036    int slot;
01037    int size;
01038 
01039    if (!pref->order[0])
01040       return;
01041 
01042    memcpy(&oldorder, pref, sizeof(oldorder));
01043    memset(pref, 0, sizeof(*pref));
01044 
01045    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01046       slot = oldorder.order[x];
01047       size = oldorder.framing[x];
01048       if (! slot)
01049          break;
01050       if (AST_FORMAT_LIST[slot-1].bits != format) {
01051          pref->order[y] = slot;
01052          pref->framing[y++] = size;
01053       }
01054    }
01055    
01056 }
01057 
01058 /*! \brief Append codec to list */
01059 int ast_codec_pref_append(struct ast_codec_pref *pref, int format)
01060 {
01061    int x, newindex = 0;
01062 
01063    ast_codec_pref_remove(pref, format);
01064 
01065    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01066       if (AST_FORMAT_LIST[x].bits == format) {
01067          newindex = x + 1;
01068          break;
01069       }
01070    }
01071 
01072    if (newindex) {
01073       for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01074          if (!pref->order[x]) {
01075             pref->order[x] = newindex;
01076             break;
01077          }
01078       }
01079    }
01080 
01081    return x;
01082 }
01083 
01084 /*! \brief Prepend codec to list */
01085 void ast_codec_pref_prepend(struct ast_codec_pref *pref, int format, int only_if_existing)
01086 {
01087    int x, newindex = 0;
01088 
01089    /* First step is to get the codecs "index number" */
01090    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01091       if (AST_FORMAT_LIST[x].bits == format) {
01092          newindex = x + 1;
01093          break;
01094       }
01095    }
01096    /* Done if its unknown */
01097    if (!newindex)
01098       return;
01099 
01100    /* Now find any existing occurrence, or the end */
01101    for (x = 0; x < 32; x++) {
01102       if (!pref->order[x] || pref->order[x] == newindex)
01103          break;
01104    }
01105 
01106    if (only_if_existing && !pref->order[x])
01107       return;
01108 
01109    /* Move down to make space to insert - either all the way to the end,
01110       or as far as the existing location (which will be overwritten) */
01111    for (; x > 0; x--) {
01112       pref->order[x] = pref->order[x - 1];
01113       pref->framing[x] = pref->framing[x - 1];
01114    }
01115 
01116    /* And insert the new entry */
01117    pref->order[0] = newindex;
01118    pref->framing[0] = 0; /* ? */
01119 }
01120 
01121 /*! \brief Set packet size for codec */
01122 int ast_codec_pref_setsize(struct ast_codec_pref *pref, int format, int framems)
01123 {
01124    int x, idx = -1;
01125 
01126    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01127       if (AST_FORMAT_LIST[x].bits == format) {
01128          idx = x;
01129          break;
01130       }
01131    }
01132 
01133    if (idx < 0)
01134       return -1;
01135 
01136    /* size validation */
01137    if (!framems)
01138       framems = AST_FORMAT_LIST[idx].def_ms;
01139 
01140    if (AST_FORMAT_LIST[idx].inc_ms && framems % AST_FORMAT_LIST[idx].inc_ms) /* avoid division by zero */
01141       framems -= framems % AST_FORMAT_LIST[idx].inc_ms;
01142 
01143    if (framems < AST_FORMAT_LIST[idx].min_ms)
01144       framems = AST_FORMAT_LIST[idx].min_ms;
01145 
01146    if (framems > AST_FORMAT_LIST[idx].max_ms)
01147       framems = AST_FORMAT_LIST[idx].max_ms;
01148 
01149    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01150       if (pref->order[x] == (idx + 1)) {
01151          pref->framing[x] = framems;
01152          break;
01153       }
01154    }
01155 
01156    return x;
01157 }
01158 
01159 /*! \brief Get packet size for codec */
01160 struct ast_format_list ast_codec_pref_getsize(struct ast_codec_pref *pref, int format)
01161 {
01162    int x, idx = -1, framems = 0;
01163    struct ast_format_list fmt = { 0, };
01164 
01165    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01166       if (AST_FORMAT_LIST[x].bits == format) {
01167          fmt = AST_FORMAT_LIST[x];
01168          idx = x;
01169          break;
01170       }
01171    }
01172 
01173    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01174       if (pref->order[x] == (idx + 1)) {
01175          framems = pref->framing[x];
01176          break;
01177       }
01178    }
01179 
01180    /* size validation */
01181    if (!framems)
01182       framems = AST_FORMAT_LIST[idx].def_ms;
01183 
01184    if (AST_FORMAT_LIST[idx].inc_ms && framems % AST_FORMAT_LIST[idx].inc_ms) /* avoid division by zero */
01185       framems -= framems % AST_FORMAT_LIST[idx].inc_ms;
01186 
01187    if (framems < AST_FORMAT_LIST[idx].min_ms)
01188       framems = AST_FORMAT_LIST[idx].min_ms;
01189 
01190    if (framems > AST_FORMAT_LIST[idx].max_ms)
01191       framems = AST_FORMAT_LIST[idx].max_ms;
01192 
01193    fmt.cur_ms = framems;
01194 
01195    return fmt;
01196 }
01197 
01198 /*! \brief Pick a codec */
01199 int ast_codec_choose(struct ast_codec_pref *pref, int formats, int find_best)
01200 {
01201    int x, ret = 0, slot;
01202 
01203    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01204       slot = pref->order[x];
01205 
01206       if (!slot)
01207          break;
01208       if (formats & AST_FORMAT_LIST[slot-1].bits) {
01209          ret = AST_FORMAT_LIST[slot-1].bits;
01210          break;
01211       }
01212    }
01213    if (ret & AST_FORMAT_AUDIO_MASK)
01214       return ret;
01215 
01216    ast_debug(4, "Could not find preferred codec - %s\n", find_best ? "Going for the best codec" : "Returning zero codec");
01217 
01218       return find_best ? ast_best_codec(formats) : 0;
01219 }
01220 
01221 int ast_parse_allow_disallow(struct ast_codec_pref *pref, int *mask, const char *list, int allowing) 
01222 {
01223    int errors = 0;
01224    char *parse = NULL, *this = NULL, *psize = NULL;
01225    int format = 0, framems = 0;
01226 
01227    parse = ast_strdupa(list);
01228    while ((this = strsep(&parse, ","))) {
01229       framems = 0;
01230       if ((psize = strrchr(this, ':'))) {
01231          *psize++ = '\0';
01232          ast_debug(1, "Packetization for codec: %s is %s\n", this, psize);
01233          framems = atoi(psize);
01234          if (framems < 0) {
01235             framems = 0;
01236             errors++;
01237             ast_log(LOG_WARNING, "Bad packetization value for codec %s\n", this);
01238          }
01239       }
01240       if (!(format = ast_getformatbyname(this))) {
01241          ast_log(LOG_WARNING, "Cannot %s unknown format '%s'\n", allowing ? "allow" : "disallow", this);
01242          errors++;
01243          continue;
01244       }
01245 
01246       if (mask) {
01247          if (allowing)
01248             *mask |= format;
01249          else
01250             *mask &= ~format;
01251       }
01252 
01253       /* Set up a preference list for audio. Do not include video in preferences 
01254          since we can not transcode video and have to use whatever is offered
01255        */
01256       if (pref && (format & AST_FORMAT_AUDIO_MASK)) {
01257          if (strcasecmp(this, "all")) {
01258             if (allowing) {
01259                ast_codec_pref_append(pref, format);
01260                ast_codec_pref_setsize(pref, format, framems);
01261             }
01262             else
01263                ast_codec_pref_remove(pref, format);
01264          } else if (!allowing) {
01265             memset(pref, 0, sizeof(*pref));
01266          }
01267       }
01268    }
01269    return errors;
01270 }
01271 
01272 static int g723_len(unsigned char buf)
01273 {
01274    enum frame_type type = buf & TYPE_MASK;
01275 
01276    switch(type) {
01277    case TYPE_DONTSEND:
01278       return 0;
01279       break;
01280    case TYPE_SILENCE:
01281       return 4;
01282       break;
01283    case TYPE_HIGH:
01284       return 24;
01285       break;
01286    case TYPE_LOW:
01287       return 20;
01288       break;
01289    default:
01290       ast_log(LOG_WARNING, "Badly encoded frame (%d)\n", type);
01291    }
01292    return -1;
01293 }
01294 
01295 static int g723_samples(unsigned char *buf, int maxlen)
01296 {
01297    int pos = 0;
01298    int samples = 0;
01299    int res;
01300    while(pos < maxlen) {
01301       res = g723_len(buf[pos]);
01302       if (res <= 0)
01303          break;
01304       samples += 240;
01305       pos += res;
01306    }
01307    return samples;
01308 }
01309 
01310 static unsigned char get_n_bits_at(unsigned char *data, int n, int bit)
01311 {
01312    int byte = bit / 8;       /* byte containing first bit */
01313    int rem = 8 - (bit % 8);  /* remaining bits in first byte */
01314    unsigned char ret = 0;
01315    
01316    if (n <= 0 || n > 8)
01317       return 0;
01318 
01319    if (rem < n) {
01320       ret = (data[byte] << (n - rem));
01321       ret |= (data[byte + 1] >> (8 - n + rem));
01322    } else {
01323       ret = (data[byte] >> (rem - n));
01324    }
01325 
01326    return (ret & (0xff >> (8 - n)));
01327 }
01328 
01329 static int speex_get_wb_sz_at(unsigned char *data, int len, int bit)
01330 {
01331    static int SpeexWBSubModeSz[] = {
01332       0, 36, 112, 192,
01333       352, 0, 0, 0 };
01334    int off = bit;
01335    unsigned char c;
01336 
01337    /* skip up to two wideband frames */
01338    if (((len * 8 - off) >= 5) && 
01339       get_n_bits_at(data, 1, off)) {
01340       c = get_n_bits_at(data, 3, off + 1);
01341       off += SpeexWBSubModeSz[c];
01342 
01343       if (((len * 8 - off) >= 5) && 
01344          get_n_bits_at(data, 1, off)) {
01345          c = get_n_bits_at(data, 3, off + 1);
01346          off += SpeexWBSubModeSz[c];
01347 
01348          if (((len * 8 - off) >= 5) && 
01349             get_n_bits_at(data, 1, off)) {
01350             ast_log(LOG_WARNING, "Encountered corrupt speex frame; too many wideband frames in a row.\n");
01351             return -1;
01352          }
01353       }
01354 
01355    }
01356    return off - bit;
01357 }
01358 
01359 static int speex_samples(unsigned char *data, int len)
01360 {
01361    static int SpeexSubModeSz[] = {
01362       5, 43, 119, 160,
01363       220, 300, 364, 492, 
01364       79, 0, 0, 0,
01365       0, 0, 0, 0 };
01366    static int SpeexInBandSz[] = { 
01367       1, 1, 4, 4,
01368       4, 4, 4, 4,
01369       8, 8, 16, 16,
01370       32, 32, 64, 64 };
01371    int bit = 0;
01372    int cnt = 0;
01373    int off;
01374    unsigned char c;
01375 
01376    while ((len * 8 - bit) >= 5) {
01377       /* skip wideband frames */
01378       off = speex_get_wb_sz_at(data, len, bit);
01379       if (off < 0)  {
01380          ast_log(LOG_WARNING, "Had error while reading wideband frames for speex samples\n");
01381          break;
01382       }
01383       bit += off;
01384 
01385       if ((len * 8 - bit) < 5) {
01386          ast_log(LOG_WARNING, "Not enough bits remaining after wide band for speex samples.\n");
01387          break;
01388       }
01389 
01390       /* get control bits */
01391       c = get_n_bits_at(data, 5, bit);
01392       bit += 5;
01393 
01394       if (c == 15) { 
01395          /* terminator */
01396          break; 
01397       } else if (c == 14) {
01398          /* in-band signal; next 4 bits contain signal id */
01399          c = get_n_bits_at(data, 4, bit);
01400          bit += 4;
01401          bit += SpeexInBandSz[c];
01402       } else if (c == 13) {
01403          /* user in-band; next 5 bits contain msg len */
01404          c = get_n_bits_at(data, 5, bit);
01405          bit += 5;
01406          bit += c * 8;
01407       } else if (c > 8) {
01408          /* unknown */
01409          break;
01410       } else {
01411          /* skip number bits for submode (less the 5 control bits) */
01412          bit += SpeexSubModeSz[c] - 5;
01413          cnt += 160; /* new frame */
01414       }
01415    }
01416    return cnt;
01417 }
01418 
01419 int ast_codec_get_samples(struct ast_frame *f)
01420 {
01421    int samples=0;
01422    switch(f->subclass) {
01423    case AST_FORMAT_SPEEX:
01424       samples = speex_samples(f->data.ptr, f->datalen);
01425       break;
01426    case AST_FORMAT_G723_1:
01427       samples = g723_samples(f->data.ptr, f->datalen);
01428       break;
01429    case AST_FORMAT_ILBC:
01430       samples = 240 * (f->datalen / 50);
01431       break;
01432    case AST_FORMAT_GSM:
01433       samples = 160 * (f->datalen / 33);
01434       break;
01435    case AST_FORMAT_G729A:
01436       samples = f->datalen * 8;
01437       break;
01438    case AST_FORMAT_SLINEAR:
01439    case AST_FORMAT_SLINEAR16:
01440       samples = f->datalen / 2;
01441       break;
01442    case AST_FORMAT_LPC10:
01443       /* assumes that the RTP packet contains one LPC10 frame */
01444       samples = 22 * 8;
01445       samples += (((char *)(f->data.ptr))[7] & 0x1) * 8;
01446       break;
01447    case AST_FORMAT_ULAW:
01448    case AST_FORMAT_ALAW:
01449       samples = f->datalen;
01450       break;
01451    case AST_FORMAT_G722:
01452    case AST_FORMAT_ADPCM:
01453    case AST_FORMAT_G726:
01454    case AST_FORMAT_G726_AAL2:
01455       samples = f->datalen * 2;
01456       break;
01457    default:
01458       ast_log(LOG_WARNING, "Unable to calculate samples for format %s\n", ast_getformatname(f->subclass));
01459    }
01460    return samples;
01461 }
01462 
01463 int ast_codec_get_len(int format, int samples)
01464 {
01465    int len = 0;
01466 
01467    /* XXX Still need speex, g723, and lpc10 XXX */ 
01468    switch(format) {
01469    case AST_FORMAT_G723_1:
01470       len = (samples / 240) * 20;
01471       break;
01472    case AST_FORMAT_ILBC:
01473       len = (samples / 240) * 50;
01474       break;
01475    case AST_FORMAT_GSM:
01476       len = (samples / 160) * 33;
01477       break;
01478    case AST_FORMAT_G729A:
01479       len = samples / 8;
01480       break;
01481    case AST_FORMAT_SLINEAR:
01482    case AST_FORMAT_SLINEAR16:
01483       len = samples * 2;
01484       break;
01485    case AST_FORMAT_ULAW:
01486    case AST_FORMAT_ALAW:
01487       len = samples;
01488       break;
01489    case AST_FORMAT_G722:
01490    case AST_FORMAT_ADPCM:
01491    case AST_FORMAT_G726:
01492    case AST_FORMAT_G726_AAL2:
01493       len = samples / 2;
01494       break;
01495    default:
01496       ast_log(LOG_WARNING, "Unable to calculate sample length for format %s\n", ast_getformatname(format));
01497    }
01498 
01499    return len;
01500 }
01501 
01502 int ast_frame_adjust_volume(struct ast_frame *f, int adjustment)
01503 {
01504    int count;
01505    short *fdata = f->data.ptr;
01506    short adjust_value = abs(adjustment);
01507 
01508    if ((f->frametype != AST_FRAME_VOICE) || (f->subclass != AST_FORMAT_SLINEAR))
01509       return -1;
01510 
01511    if (!adjustment)
01512       return 0;
01513 
01514    for (count = 0; count < f->samples; count++) {
01515       if (adjustment > 0) {
01516          ast_slinear_saturated_multiply(&fdata[count], &adjust_value);
01517       } else if (adjustment < 0) {
01518          ast_slinear_saturated_divide(&fdata[count], &adjust_value);
01519       }
01520    }
01521 
01522    return 0;
01523 }
01524 
01525 int ast_frame_slinear_sum(struct ast_frame *f1, struct ast_frame *f2)
01526 {
01527    int count;
01528    short *data1, *data2;
01529 
01530    if ((f1->frametype != AST_FRAME_VOICE) || (f1->subclass != AST_FORMAT_SLINEAR))
01531       return -1;
01532 
01533    if ((f2->frametype != AST_FRAME_VOICE) || (f2->subclass != AST_FORMAT_SLINEAR))
01534       return -1;
01535 
01536    if (f1->samples != f2->samples)
01537       return -1;
01538 
01539    for (count = 0, data1 = f1->data.ptr, data2 = f2->data.ptr;
01540         count < f1->samples;
01541         count++, data1++, data2++)
01542       ast_slinear_saturated_add(data1, data2);
01543 
01544    return 0;
01545 }

Generated on Wed Aug 18 22:33:52 2010 for Asterisk - the Open Source PBX by  doxygen 1.4.7