Thu Jul 9 13:40:34 2009

Asterisk developer's documentation


frame.c

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00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * Copyright (C) 1999 - 2005, Digium, Inc.
00005  *
00006  * Mark Spencer <markster@digium.com>
00007  *
00008  * See http://www.asterisk.org for more information about
00009  * the Asterisk project. Please do not directly contact
00010  * any of the maintainers of this project for assistance;
00011  * the project provides a web site, mailing lists and IRC
00012  * channels for your use.
00013  *
00014  * This program is free software, distributed under the terms of
00015  * the GNU General Public License Version 2. See the LICENSE file
00016  * at the top of the source tree.
00017  */
00018 
00019 /*! \file
00020  *
00021  * \brief Frame and codec manipulation routines
00022  *
00023  * \author Mark Spencer <markster@digium.com> 
00024  */
00025 
00026 #include "asterisk.h"
00027 
00028 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 201093 $")
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 optimizablestream;
00085    int flags;
00086    float samplesperbyte;
00087    unsigned int opt_needs_swap:1;
00088    struct ast_frame f;
00089    struct timeval delivery;
00090    char data[SMOOTHER_SIZE];
00091    char framedata[SMOOTHER_SIZE + AST_FRIENDLY_OFFSET];
00092    struct ast_frame *opt;
00093    int len;
00094 };
00095 
00096 /*! \brief Definition of supported media formats (codecs) */
00097 static struct ast_format_list AST_FORMAT_LIST[] = {
00098    { AST_FORMAT_G723_1 , "g723", 8000, "G.723.1", 20, 30, 300, 30, 30 },                                  /*!< G723.1 */
00099    { AST_FORMAT_GSM, "gsm", 8000, "GSM", 33, 20, 300, 20, 20 },                                           /*!< codec_gsm.c */
00100    { AST_FORMAT_ULAW, "ulaw", 8000, "G.711 u-law", 80, 10, 150, 10, 20 },                                 /*!< codec_ulaw.c */
00101    { AST_FORMAT_ALAW, "alaw", 8000, "G.711 A-law", 80, 10, 150, 10, 20 },                                 /*!< codec_alaw.c */
00102    { AST_FORMAT_G726, "g726", 8000, "G.726 RFC3551", 40, 10, 300, 10, 20 },                               /*!< codec_g726.c */
00103    { AST_FORMAT_ADPCM, "adpcm" , 8000, "ADPCM", 40, 10, 300, 10, 20 },                                    /*!< codec_adpcm.c */
00104    { AST_FORMAT_SLINEAR, "slin", 8000, "16 bit Signed Linear PCM", 160, 10, 70, 10, 20, AST_SMOOTHER_FLAG_BE }, /*!< Signed linear */
00105    { AST_FORMAT_LPC10, "lpc10", 8000, "LPC10", 7, 20, 20, 20, 20 },                                       /*!< codec_lpc10.c */ 
00106    { AST_FORMAT_G729A, "g729", 8000, "G.729A", 10, 10, 230, 10, 20, AST_SMOOTHER_FLAG_G729 },             /*!< Binary commercial distribution */
00107    { AST_FORMAT_SPEEX, "speex", 8000, "SpeeX", 10, 10, 60, 10, 20 },                                      /*!< codec_speex.c */
00108    { AST_FORMAT_ILBC, "ilbc", 8000, "iLBC", 50, 30, 30, 30, 30 },                                         /*!< codec_ilbc.c */ /* inc=30ms - workaround */
00109    { AST_FORMAT_G726_AAL2, "g726aal2", 8000, "G.726 AAL2", 40, 10, 300, 10, 20 },                         /*!< codec_g726.c */
00110    { AST_FORMAT_G722, "g722", 16000, "G722", 80, 10, 150, 10, 20 },                                       /*!< codec_g722.c */
00111    { AST_FORMAT_SLINEAR16, "slin16", 16000, "16 bit Signed Linear PCM (16kHz)", 320, 10, 70, 10, 20, AST_SMOOTHER_FLAG_BE },    /*!< Signed linear (16kHz) */
00112    { AST_FORMAT_JPEG, "jpeg", 0, "JPEG image"},                                                           /*!< See format_jpeg.c */
00113    { AST_FORMAT_PNG, "png", 0, "PNG image"},                                                              /*!< PNG Image format */
00114    { AST_FORMAT_H261, "h261", 0, "H.261 Video" },                                                         /*!< H.261 Video Passthrough */
00115    { AST_FORMAT_H263, "h263", 0, "H.263 Video" },                                                         /*!< H.263 Passthrough support, see format_h263.c */
00116    { AST_FORMAT_H263_PLUS, "h263p", 0, "H.263+ Video" },                                                  /*!< H.263plus passthrough support See format_h263.c */
00117    { AST_FORMAT_H264, "h264", 0, "H.264 Video" },                                                         /*!< Passthrough support, see format_h263.c */
00118    { AST_FORMAT_MP4_VIDEO, "mpeg4", 0, "MPEG4 Video" },                                                   /*!< Passthrough support for MPEG4 */
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, f->samples);
00134    } else {
00135       memcpy(s->data + s->len, f->data, 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, f->data, 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 = 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, 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 (ast_test_flag(fr, AST_FRFLAG_FROM_TRANSLATOR)) {
00334       ast_translate_frame_freed(fr);
00335    } else if (ast_test_flag(fr, AST_FRFLAG_FROM_DSP)) {
00336       ast_dsp_frame_freed(fr);
00337    } else if (ast_test_flag(fr, AST_FRFLAG_FROM_FILESTREAM)) {
00338       ast_filestream_frame_freed(fr);
00339    }
00340 
00341    if (!fr->mallocd)
00342       return;
00343 
00344 #if !defined(LOW_MEMORY)
00345    if (cache && fr->mallocd == AST_MALLOCD_HDR) {
00346       /* Cool, only the header is malloc'd, let's just cache those for now 
00347        * to keep things simple... */
00348       struct ast_frame_cache *frames;
00349 
00350       if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames))) &&
00351           (frames->size < FRAME_CACHE_MAX_SIZE)) {
00352          AST_LIST_INSERT_HEAD(&frames->list, fr, frame_list);
00353          frames->size++;
00354          return;
00355       }
00356    }
00357 #endif
00358    
00359    if (fr->mallocd & AST_MALLOCD_DATA) {
00360       if (fr->data) 
00361          ast_free(fr->data - fr->offset);
00362    }
00363    if (fr->mallocd & AST_MALLOCD_SRC) {
00364       if (fr->src)
00365          ast_free((void *) fr->src);
00366    }
00367    if (fr->mallocd & AST_MALLOCD_HDR) {
00368       ast_free(fr);
00369    }
00370 }
00371 
00372 
00373 void ast_frame_free(struct ast_frame *frame, int cache)
00374 {
00375    struct ast_frame *next;
00376 
00377    for (next = AST_LIST_NEXT(frame, frame_list);
00378         frame;
00379         frame = next, next = frame ? AST_LIST_NEXT(frame, frame_list) : NULL) {
00380       __frame_free(frame, cache);
00381    }
00382 }
00383 
00384 /*!
00385  * \brief 'isolates' a frame by duplicating non-malloc'ed components
00386  * (header, src, data).
00387  * On return all components are malloc'ed
00388  */
00389 struct ast_frame *ast_frisolate(struct ast_frame *fr)
00390 {
00391    struct ast_frame *out;
00392    void *newdata;
00393 
00394    /* if none of the existing frame is malloc'd, let ast_frdup() do it
00395       since it is more efficient
00396    */
00397    if (fr->mallocd == 0) {
00398       return ast_frdup(fr);
00399    }
00400 
00401    /* if everything is already malloc'd, we are done */
00402    if ((fr->mallocd & (AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA)) ==
00403        (AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA)) {
00404       return fr;
00405    }
00406 
00407    if (!(fr->mallocd & AST_MALLOCD_HDR)) {
00408       /* Allocate a new header if needed */
00409       if (!(out = ast_frame_header_new())) {
00410          return NULL;
00411       }
00412       out->frametype = fr->frametype;
00413       out->subclass = fr->subclass;
00414       out->datalen = fr->datalen;
00415       out->samples = fr->samples;
00416       out->offset = fr->offset;
00417       /* Copy the timing data */
00418       ast_copy_flags(out, fr, AST_FRFLAG_HAS_TIMING_INFO);
00419       if (ast_test_flag(fr, AST_FRFLAG_HAS_TIMING_INFO)) {
00420          out->ts = fr->ts;
00421          out->len = fr->len;
00422          out->seqno = fr->seqno;
00423       }
00424    } else {
00425       ast_clear_flag(fr, AST_FRFLAG_FROM_TRANSLATOR);
00426       ast_clear_flag(fr, AST_FRFLAG_FROM_DSP);
00427       ast_clear_flag(fr, AST_FRFLAG_FROM_FILESTREAM);
00428       out = fr;
00429    }
00430    
00431    if (!(fr->mallocd & AST_MALLOCD_SRC) && fr->src) {
00432       if (!(out->src = ast_strdup(fr->src))) {
00433          if (out != fr) {
00434             ast_free(out);
00435          }
00436          return NULL;
00437       }
00438    } else {
00439       out->src = fr->src;
00440       fr->src = NULL;
00441       fr->mallocd &= ~AST_MALLOCD_SRC;
00442    }
00443    
00444    if (!(fr->mallocd & AST_MALLOCD_DATA))  {
00445       if (!(newdata = ast_malloc(fr->datalen + AST_FRIENDLY_OFFSET))) {
00446          if (out->src != fr->src) {
00447             ast_free((void *) out->src);
00448          }
00449          if (out != fr) {
00450             ast_free(out);
00451          }
00452          return NULL;
00453       }
00454       newdata += AST_FRIENDLY_OFFSET;
00455       out->offset = AST_FRIENDLY_OFFSET;
00456       out->datalen = fr->datalen;
00457       memcpy(newdata, fr->data, fr->datalen);
00458       out->data = newdata;
00459    } else {
00460       out->data = fr->data;
00461       memset(&fr->data, 0, sizeof(fr->data));
00462       fr->mallocd &= ~AST_MALLOCD_DATA;
00463    }
00464 
00465    out->mallocd = AST_MALLOCD_HDR | AST_MALLOCD_SRC | AST_MALLOCD_DATA;
00466    
00467    return out;
00468 }
00469 
00470 struct ast_frame *ast_frdup(const struct ast_frame *f)
00471 {
00472    struct ast_frame *out = NULL;
00473    int len, srclen = 0;
00474    void *buf = NULL;
00475 
00476 #if !defined(LOW_MEMORY)
00477    struct ast_frame_cache *frames;
00478 #endif
00479 
00480    /* Start with standard stuff */
00481    len = sizeof(*out) + AST_FRIENDLY_OFFSET + f->datalen;
00482    /* If we have a source, add space for it */
00483    /*
00484     * XXX Watch out here - if we receive a src which is not terminated
00485     * properly, we can be easily attacked. Should limit the size we deal with.
00486     */
00487    if (f->src)
00488       srclen = strlen(f->src);
00489    if (srclen > 0)
00490       len += srclen + 1;
00491    
00492 #if !defined(LOW_MEMORY)
00493    if ((frames = ast_threadstorage_get(&frame_cache, sizeof(*frames)))) {
00494       AST_LIST_TRAVERSE_SAFE_BEGIN(&frames->list, out, frame_list) {
00495          if (out->mallocd_hdr_len >= len) {
00496             size_t mallocd_len = out->mallocd_hdr_len;
00497 
00498             AST_LIST_REMOVE_CURRENT(frame_list);
00499             memset(out, 0, sizeof(*out));
00500             out->mallocd_hdr_len = mallocd_len;
00501             buf = out;
00502             frames->size--;
00503             break;
00504          }
00505       }
00506       AST_LIST_TRAVERSE_SAFE_END;
00507    }
00508 #endif
00509 
00510    if (!buf) {
00511       if (!(buf = ast_calloc_cache(1, len)))
00512          return NULL;
00513       out = buf;
00514       out->mallocd_hdr_len = len;
00515    }
00516 
00517    out->frametype = f->frametype;
00518    out->subclass = f->subclass;
00519    out->datalen = f->datalen;
00520    out->samples = f->samples;
00521    out->delivery = f->delivery;
00522    /* Set us as having malloc'd header only, so it will eventually
00523       get freed. */
00524    out->mallocd = AST_MALLOCD_HDR;
00525    out->offset = AST_FRIENDLY_OFFSET;
00526    if (out->datalen) {
00527       out->data = buf + sizeof(*out) + AST_FRIENDLY_OFFSET;
00528       memcpy(out->data, f->data, out->datalen); 
00529    }
00530    if (srclen > 0) {
00531       /* This may seem a little strange, but it's to avoid a gcc (4.2.4) compiler warning */
00532       char *src;
00533       out->src = buf + sizeof(*out) + AST_FRIENDLY_OFFSET + f->datalen;
00534       src = (char *) out->src;
00535       /* Must have space since we allocated for it */
00536       strcpy(src, f->src);
00537    }
00538    ast_copy_flags(out, f, AST_FRFLAG_HAS_TIMING_INFO);
00539    out->ts = f->ts;
00540    out->len = f->len;
00541    out->seqno = f->seqno;
00542    return out;
00543 }
00544 
00545 void ast_swapcopy_samples(void *dst, const void *src, int samples)
00546 {
00547    int i;
00548    unsigned short *dst_s = dst;
00549    const unsigned short *src_s = src;
00550 
00551    for (i = 0; i < samples; i++)
00552       dst_s[i] = (src_s[i]<<8) | (src_s[i]>>8);
00553 }
00554 
00555 
00556 struct ast_format_list *ast_get_format_list_index(int index) 
00557 {
00558    return &AST_FORMAT_LIST[index];
00559 }
00560 
00561 struct ast_format_list *ast_get_format_list(size_t *size) 
00562 {
00563    *size = ARRAY_LEN(AST_FORMAT_LIST);
00564    return AST_FORMAT_LIST;
00565 }
00566 
00567 char* ast_getformatname(int format)
00568 {
00569    int x;
00570    char *ret = "unknown";
00571    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00572       if (AST_FORMAT_LIST[x].bits == format) {
00573          ret = AST_FORMAT_LIST[x].name;
00574          break;
00575       }
00576    }
00577    return ret;
00578 }
00579 
00580 char *ast_getformatname_multiple(char *buf, size_t size, int format)
00581 {
00582    int x;
00583    unsigned len;
00584    char *start, *end = buf;
00585 
00586    if (!size)
00587       return buf;
00588    snprintf(end, size, "0x%x (", format);
00589    len = strlen(end);
00590    end += len;
00591    size -= len;
00592    start = end;
00593    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00594       if (AST_FORMAT_LIST[x].bits & format) {
00595          snprintf(end, size,"%s|",AST_FORMAT_LIST[x].name);
00596          len = strlen(end);
00597          end += len;
00598          size -= len;
00599       }
00600    }
00601    if (start == end)
00602       ast_copy_string(start, "nothing)", size);
00603    else if (size > 1)
00604       *(end -1) = ')';
00605    return buf;
00606 }
00607 
00608 static struct ast_codec_alias_table {
00609    char *alias;
00610    char *realname;
00611 } ast_codec_alias_table[] = {
00612    { "slinear", "slin"},
00613    { "slinear16", "slin16"},
00614    { "g723.1", "g723"},
00615 };
00616 
00617 static const char *ast_expand_codec_alias(const char *in)
00618 {
00619    int x;
00620 
00621    for (x = 0; x < ARRAY_LEN(ast_codec_alias_table); x++) {
00622       if (!strcmp(in,ast_codec_alias_table[x].alias))
00623          return ast_codec_alias_table[x].realname;
00624    }
00625    return in;
00626 }
00627 
00628 int ast_getformatbyname(const char *name)
00629 {
00630    int x, all, format = 0;
00631 
00632    all = strcasecmp(name, "all") ? 0 : 1;
00633    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00634       if (all || 
00635            !strcasecmp(AST_FORMAT_LIST[x].name,name) ||
00636            !strcasecmp(AST_FORMAT_LIST[x].name,ast_expand_codec_alias(name))) {
00637          format |= AST_FORMAT_LIST[x].bits;
00638          if (!all)
00639             break;
00640       }
00641    }
00642 
00643    return format;
00644 }
00645 
00646 char *ast_codec2str(int codec)
00647 {
00648    int x;
00649    char *ret = "unknown";
00650    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
00651       if (AST_FORMAT_LIST[x].bits == codec) {
00652          ret = AST_FORMAT_LIST[x].desc;
00653          break;
00654       }
00655    }
00656    return ret;
00657 }
00658 
00659 static char *show_codecs(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00660 {
00661    int i, found=0;
00662    char hex[25];
00663 
00664    switch (cmd) {
00665    case CLI_INIT:
00666       e->command = "core show codecs [audio|video|image]";
00667       e->usage = 
00668          "Usage: core show codecs [audio|video|image]\n"
00669          "       Displays codec mapping\n";
00670       return NULL;
00671    case CLI_GENERATE:
00672       return NULL;
00673    }
00674    
00675    if ((a->argc < 3) || (a->argc > 4))
00676       return CLI_SHOWUSAGE;
00677 
00678    if (!ast_opt_dont_warn)
00679       ast_cli(a->fd, "Disclaimer: this command is for informational purposes only.\n"
00680             "\tIt does not indicate anything about your configuration.\n");
00681 
00682    ast_cli(a->fd, "%11s %9s %10s   TYPE   %8s   %s\n","INT","BINARY","HEX","NAME","DESC");
00683    ast_cli(a->fd, "--------------------------------------------------------------------------------\n");
00684    if ((a->argc == 3) || (!strcasecmp(a->argv[3],"audio"))) {
00685       found = 1;
00686       for (i=0;i<13;i++) {
00687          snprintf(hex,25,"(0x%x)",1<<i);
00688          ast_cli(a->fd, "%11u (1 << %2d) %10s  audio   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00689       }
00690    }
00691 
00692    if ((a->argc == 3) || (!strcasecmp(a->argv[3],"image"))) {
00693       found = 1;
00694       for (i=16;i<18;i++) {
00695          snprintf(hex,25,"(0x%x)",1<<i);
00696          ast_cli(a->fd, "%11u (1 << %2d) %10s  image   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00697       }
00698    }
00699 
00700    if ((a->argc == 3) || (!strcasecmp(a->argv[3],"video"))) {
00701       found = 1;
00702       for (i=18;i<22;i++) {
00703          snprintf(hex,25,"(0x%x)",1<<i);
00704          ast_cli(a->fd, "%11u (1 << %2d) %10s  video   %8s   (%s)\n",1 << i,i,hex,ast_getformatname(1<<i),ast_codec2str(1<<i));
00705       }
00706    }
00707 
00708    if (!found)
00709       return CLI_SHOWUSAGE;
00710    else
00711       return CLI_SUCCESS;
00712 }
00713 
00714 static char *show_codec_n(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00715 {
00716    int codec, i, found=0;
00717 
00718    switch (cmd) {
00719    case CLI_INIT:
00720       e->command = "core show codec";
00721       e->usage = 
00722          "Usage: core show codec <number>\n"
00723          "       Displays codec mapping\n";
00724       return NULL;
00725    case CLI_GENERATE:
00726       return NULL;
00727    }
00728 
00729    if (a->argc != 4)
00730       return CLI_SHOWUSAGE;
00731 
00732    if (sscanf(a->argv[3],"%d",&codec) != 1)
00733       return CLI_SHOWUSAGE;
00734 
00735    for (i = 0; i < 32; i++)
00736       if (codec & (1 << i)) {
00737          found = 1;
00738          ast_cli(a->fd, "%11u (1 << %2d)  %s\n",1 << i,i,ast_codec2str(1<<i));
00739       }
00740 
00741    if (!found)
00742       ast_cli(a->fd, "Codec %d not found\n", codec);
00743 
00744    return CLI_SUCCESS;
00745 }
00746 
00747 /*! Dump a frame for debugging purposes */
00748 void ast_frame_dump(const char *name, struct ast_frame *f, char *prefix)
00749 {
00750    const char noname[] = "unknown";
00751    char ftype[40] = "Unknown Frametype";
00752    char cft[80];
00753    char subclass[40] = "Unknown Subclass";
00754    char csub[80];
00755    char moreinfo[40] = "";
00756    char cn[60];
00757    char cp[40];
00758    char cmn[40];
00759    const char *message = "Unknown";
00760 
00761    if (!name)
00762       name = noname;
00763 
00764 
00765    if (!f) {
00766       ast_verbose("%s [ %s (NULL) ] [%s]\n", 
00767          term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00768          term_color(cft, "HANGUP", COLOR_BRRED, COLOR_BLACK, sizeof(cft)), 
00769          term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00770       return;
00771    }
00772    /* XXX We should probably print one each of voice and video when the format changes XXX */
00773    if (f->frametype == AST_FRAME_VOICE)
00774       return;
00775    if (f->frametype == AST_FRAME_VIDEO)
00776       return;
00777    switch(f->frametype) {
00778    case AST_FRAME_DTMF_BEGIN:
00779       strcpy(ftype, "DTMF Begin");
00780       subclass[0] = f->subclass;
00781       subclass[1] = '\0';
00782       break;
00783    case AST_FRAME_DTMF_END:
00784       strcpy(ftype, "DTMF End");
00785       subclass[0] = f->subclass;
00786       subclass[1] = '\0';
00787       break;
00788    case AST_FRAME_CONTROL:
00789       strcpy(ftype, "Control");
00790       switch(f->subclass) {
00791       case AST_CONTROL_HANGUP:
00792          strcpy(subclass, "Hangup");
00793          break;
00794       case AST_CONTROL_RING:
00795          strcpy(subclass, "Ring");
00796          break;
00797       case AST_CONTROL_RINGING:
00798          strcpy(subclass, "Ringing");
00799          break;
00800       case AST_CONTROL_ANSWER:
00801          strcpy(subclass, "Answer");
00802          break;
00803       case AST_CONTROL_BUSY:
00804          strcpy(subclass, "Busy");
00805          break;
00806       case AST_CONTROL_TAKEOFFHOOK:
00807          strcpy(subclass, "Take Off Hook");
00808          break;
00809       case AST_CONTROL_OFFHOOK:
00810          strcpy(subclass, "Line Off Hook");
00811          break;
00812       case AST_CONTROL_CONGESTION:
00813          strcpy(subclass, "Congestion");
00814          break;
00815       case AST_CONTROL_FLASH:
00816          strcpy(subclass, "Flash");
00817          break;
00818       case AST_CONTROL_WINK:
00819          strcpy(subclass, "Wink");
00820          break;
00821       case AST_CONTROL_OPTION:
00822          strcpy(subclass, "Option");
00823          break;
00824       case AST_CONTROL_RADIO_KEY:
00825          strcpy(subclass, "Key Radio");
00826          break;
00827       case AST_CONTROL_RADIO_UNKEY:
00828          strcpy(subclass, "Unkey Radio");
00829          break;
00830       case AST_CONTROL_HOLD:
00831          strcpy(subclass, "Hold");
00832          break;
00833       case AST_CONTROL_UNHOLD:
00834          strcpy(subclass, "Unhold");
00835          break;
00836       case AST_CONTROL_T38:
00837          if (f->datalen != sizeof(enum ast_control_t38)) {
00838             message = "Invalid";
00839          } else {
00840             enum ast_control_t38 state = *((enum ast_control_t38 *) f->data);
00841             if (state == AST_T38_REQUEST_NEGOTIATE)
00842                message = "Negotiation Requested";
00843             else if (state == AST_T38_REQUEST_TERMINATE)
00844                message = "Negotiation Request Terminated";
00845             else if (state == AST_T38_NEGOTIATED)
00846                message = "Negotiated";
00847             else if (state == AST_T38_TERMINATED)
00848                message = "Terminated";
00849             else if (state == AST_T38_REFUSED)
00850                message = "Refused";
00851          }
00852          snprintf(subclass, sizeof(subclass), "T38/%s", message);
00853          break;
00854       case -1:
00855          strcpy(subclass, "Stop generators");
00856          break;
00857       default:
00858          snprintf(subclass, sizeof(subclass), "Unknown control '%d'", f->subclass);
00859       }
00860       break;
00861    case AST_FRAME_NULL:
00862       strcpy(ftype, "Null Frame");
00863       strcpy(subclass, "N/A");
00864       break;
00865    case AST_FRAME_IAX:
00866       /* Should never happen */
00867       strcpy(ftype, "IAX Specific");
00868       snprintf(subclass, sizeof(subclass), "IAX Frametype %d", f->subclass);
00869       break;
00870    case AST_FRAME_TEXT:
00871       strcpy(ftype, "Text");
00872       strcpy(subclass, "N/A");
00873       ast_copy_string(moreinfo, f->data, sizeof(moreinfo));
00874       break;
00875    case AST_FRAME_IMAGE:
00876       strcpy(ftype, "Image");
00877       snprintf(subclass, sizeof(subclass), "Image format %s\n", ast_getformatname(f->subclass));
00878       break;
00879    case AST_FRAME_HTML:
00880       strcpy(ftype, "HTML");
00881       switch(f->subclass) {
00882       case AST_HTML_URL:
00883          strcpy(subclass, "URL");
00884          ast_copy_string(moreinfo, f->data, sizeof(moreinfo));
00885          break;
00886       case AST_HTML_DATA:
00887          strcpy(subclass, "Data");
00888          break;
00889       case AST_HTML_BEGIN:
00890          strcpy(subclass, "Begin");
00891          break;
00892       case AST_HTML_END:
00893          strcpy(subclass, "End");
00894          break;
00895       case AST_HTML_LDCOMPLETE:
00896          strcpy(subclass, "Load Complete");
00897          break;
00898       case AST_HTML_NOSUPPORT:
00899          strcpy(subclass, "No Support");
00900          break;
00901       case AST_HTML_LINKURL:
00902          strcpy(subclass, "Link URL");
00903          ast_copy_string(moreinfo, f->data, sizeof(moreinfo));
00904          break;
00905       case AST_HTML_UNLINK:
00906          strcpy(subclass, "Unlink");
00907          break;
00908       case AST_HTML_LINKREJECT:
00909          strcpy(subclass, "Link Reject");
00910          break;
00911       default:
00912          snprintf(subclass, sizeof(subclass), "Unknown HTML frame '%d'\n", f->subclass);
00913          break;
00914       }
00915       break;
00916    case AST_FRAME_MODEM:
00917       strcpy(ftype, "Modem");
00918       switch (f->subclass) {
00919       case AST_MODEM_T38:
00920          strcpy(subclass, "T.38");
00921          break;
00922       case AST_MODEM_V150:
00923          strcpy(subclass, "V.150");
00924          break;
00925       default:
00926          snprintf(subclass, sizeof(subclass), "Unknown MODEM frame '%d'\n", f->subclass);
00927          break;
00928       }
00929       break;
00930    default:
00931       snprintf(ftype, sizeof(ftype), "Unknown Frametype '%d'", f->frametype);
00932    }
00933    if (!ast_strlen_zero(moreinfo))
00934       ast_verbose("%s [ TYPE: %s (%d) SUBCLASS: %s (%d) '%s' ] [%s]\n",  
00935              term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00936              term_color(cft, ftype, COLOR_BRRED, COLOR_BLACK, sizeof(cft)),
00937              f->frametype, 
00938              term_color(csub, subclass, COLOR_BRCYAN, COLOR_BLACK, sizeof(csub)),
00939              f->subclass, 
00940              term_color(cmn, moreinfo, COLOR_BRGREEN, COLOR_BLACK, sizeof(cmn)),
00941              term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00942    else
00943       ast_verbose("%s [ TYPE: %s (%d) SUBCLASS: %s (%d) ] [%s]\n",  
00944              term_color(cp, prefix, COLOR_BRMAGENTA, COLOR_BLACK, sizeof(cp)),
00945              term_color(cft, ftype, COLOR_BRRED, COLOR_BLACK, sizeof(cft)),
00946              f->frametype, 
00947              term_color(csub, subclass, COLOR_BRCYAN, COLOR_BLACK, sizeof(csub)),
00948              f->subclass, 
00949              term_color(cn, name, COLOR_YELLOW, COLOR_BLACK, sizeof(cn)));
00950 }
00951 
00952 
00953 /* Builtin Asterisk CLI-commands for debugging */
00954 static struct ast_cli_entry my_clis[] = {
00955    AST_CLI_DEFINE(show_codecs, "Displays a list of codecs"),
00956    AST_CLI_DEFINE(show_codec_n, "Shows a specific codec"),
00957 };
00958 
00959 int init_framer(void)
00960 {
00961    ast_cli_register_multiple(my_clis, sizeof(my_clis) / sizeof(struct ast_cli_entry));
00962    return 0;   
00963 }
00964 
00965 void ast_codec_pref_convert(struct ast_codec_pref *pref, char *buf, size_t size, int right) 
00966 {
00967    int x, differential = (int) 'A', mem;
00968    char *from, *to;
00969 
00970    if (right) {
00971       from = pref->order;
00972       to = buf;
00973       mem = size;
00974    } else {
00975       to = pref->order;
00976       from = buf;
00977       mem = 32;
00978    }
00979 
00980    memset(to, 0, mem);
00981    for (x = 0; x < 32 ; x++) {
00982       if (!from[x])
00983          break;
00984       to[x] = right ? (from[x] + differential) : (from[x] - differential);
00985    }
00986 }
00987 
00988 int ast_codec_pref_string(struct ast_codec_pref *pref, char *buf, size_t size) 
00989 {
00990    int x, codec; 
00991    size_t total_len, slen;
00992    char *formatname;
00993    
00994    memset(buf,0,size);
00995    total_len = size;
00996    buf[0] = '(';
00997    total_len--;
00998    for(x = 0; x < 32 ; x++) {
00999       if (total_len <= 0)
01000          break;
01001       if (!(codec = ast_codec_pref_index(pref,x)))
01002          break;
01003       if ((formatname = ast_getformatname(codec))) {
01004          slen = strlen(formatname);
01005          if (slen > total_len)
01006             break;
01007          strncat(buf, formatname, total_len - 1); /* safe */
01008          total_len -= slen;
01009       }
01010       if (total_len && x < 31 && ast_codec_pref_index(pref , x + 1)) {
01011          strncat(buf, "|", total_len - 1); /* safe */
01012          total_len--;
01013       }
01014    }
01015    if (total_len) {
01016       strncat(buf, ")", total_len - 1); /* safe */
01017       total_len--;
01018    }
01019 
01020    return size - total_len;
01021 }
01022 
01023 int ast_codec_pref_index(struct ast_codec_pref *pref, int index) 
01024 {
01025    int slot = 0;
01026 
01027    
01028    if ((index >= 0) && (index < sizeof(pref->order))) {
01029       slot = pref->order[index];
01030    }
01031 
01032    return slot ? AST_FORMAT_LIST[slot-1].bits : 0;
01033 }
01034 
01035 /*! \brief Remove codec from pref list */
01036 void ast_codec_pref_remove(struct ast_codec_pref *pref, int format)
01037 {
01038    struct ast_codec_pref oldorder;
01039    int x, y = 0;
01040    int slot;
01041    int size;
01042 
01043    if (!pref->order[0])
01044       return;
01045 
01046    memcpy(&oldorder, pref, sizeof(oldorder));
01047    memset(pref, 0, sizeof(*pref));
01048 
01049    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01050       slot = oldorder.order[x];
01051       size = oldorder.framing[x];
01052       if (! slot)
01053          break;
01054       if (AST_FORMAT_LIST[slot-1].bits != format) {
01055          pref->order[y] = slot;
01056          pref->framing[y++] = size;
01057       }
01058    }
01059    
01060 }
01061 
01062 /*! \brief Append codec to list */
01063 int ast_codec_pref_append(struct ast_codec_pref *pref, int format)
01064 {
01065    int x, newindex = 0;
01066 
01067    ast_codec_pref_remove(pref, format);
01068 
01069    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01070       if (AST_FORMAT_LIST[x].bits == format) {
01071          newindex = x + 1;
01072          break;
01073       }
01074    }
01075 
01076    if (newindex) {
01077       for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01078          if (!pref->order[x]) {
01079             pref->order[x] = newindex;
01080             break;
01081          }
01082       }
01083    }
01084 
01085    return x;
01086 }
01087 
01088 /*! \brief Prepend codec to list */
01089 void ast_codec_pref_prepend(struct ast_codec_pref *pref, int format, int only_if_existing)
01090 {
01091    int x, newindex = 0;
01092 
01093    /* First step is to get the codecs "index number" */
01094    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01095       if (AST_FORMAT_LIST[x].bits == format) {
01096          newindex = x + 1;
01097          break;
01098       }
01099    }
01100    /* Done if its unknown */
01101    if (!newindex)
01102       return;
01103 
01104    /* Now find any existing occurrence, or the end */
01105    for (x = 0; x < 32; x++) {
01106       if (!pref->order[x] || pref->order[x] == newindex)
01107          break;
01108    }
01109 
01110    if (only_if_existing && !pref->order[x])
01111       return;
01112 
01113    /* Move down to make space to insert - either all the way to the end,
01114       or as far as the existing location (which will be overwritten) */
01115    for (; x > 0; x--) {
01116       pref->order[x] = pref->order[x - 1];
01117       pref->framing[x] = pref->framing[x - 1];
01118    }
01119 
01120    /* And insert the new entry */
01121    pref->order[0] = newindex;
01122    pref->framing[0] = 0; /* ? */
01123 }
01124 
01125 /*! \brief Set packet size for codec */
01126 int ast_codec_pref_setsize(struct ast_codec_pref *pref, int format, int framems)
01127 {
01128    int x, index = -1;
01129 
01130    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01131       if (AST_FORMAT_LIST[x].bits == format) {
01132          index = x;
01133          break;
01134       }
01135    }
01136 
01137    if (index < 0)
01138       return -1;
01139 
01140    /* size validation */
01141    if (!framems)
01142       framems = AST_FORMAT_LIST[index].def_ms;
01143 
01144    if (AST_FORMAT_LIST[index].inc_ms && framems % AST_FORMAT_LIST[index].inc_ms) /* avoid division by zero */
01145       framems -= framems % AST_FORMAT_LIST[index].inc_ms;
01146 
01147    if (framems < AST_FORMAT_LIST[index].min_ms)
01148       framems = AST_FORMAT_LIST[index].min_ms;
01149 
01150    if (framems > AST_FORMAT_LIST[index].max_ms)
01151       framems = AST_FORMAT_LIST[index].max_ms;
01152 
01153 
01154    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01155       if (pref->order[x] == (index + 1)) {
01156          pref->framing[x] = framems;
01157          break;
01158       }
01159    }
01160 
01161    return x;
01162 }
01163 
01164 /*! \brief Get packet size for codec */
01165 struct ast_format_list ast_codec_pref_getsize(struct ast_codec_pref *pref, int format)
01166 {
01167    int x, index = -1, framems = 0;
01168    struct ast_format_list fmt = { 0, };
01169 
01170    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01171       if (AST_FORMAT_LIST[x].bits == format) {
01172          fmt = AST_FORMAT_LIST[x];
01173          index = x;
01174          break;
01175       }
01176    }
01177 
01178    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01179       if (pref->order[x] == (index + 1)) {
01180          framems = pref->framing[x];
01181          break;
01182       }
01183    }
01184 
01185    /* size validation */
01186    if (!framems)
01187       framems = AST_FORMAT_LIST[index].def_ms;
01188 
01189    if (AST_FORMAT_LIST[index].inc_ms && framems % AST_FORMAT_LIST[index].inc_ms) /* avoid division by zero */
01190       framems -= framems % AST_FORMAT_LIST[index].inc_ms;
01191 
01192    if (framems < AST_FORMAT_LIST[index].min_ms)
01193       framems = AST_FORMAT_LIST[index].min_ms;
01194 
01195    if (framems > AST_FORMAT_LIST[index].max_ms)
01196       framems = AST_FORMAT_LIST[index].max_ms;
01197 
01198    fmt.cur_ms = framems;
01199 
01200    return fmt;
01201 }
01202 
01203 /*! \brief Pick a codec */
01204 int ast_codec_choose(struct ast_codec_pref *pref, int formats, int find_best)
01205 {
01206    int x, ret = 0, slot;
01207 
01208    for (x = 0; x < ARRAY_LEN(AST_FORMAT_LIST); x++) {
01209       slot = pref->order[x];
01210 
01211       if (!slot)
01212          break;
01213       if (formats & AST_FORMAT_LIST[slot-1].bits) {
01214          ret = AST_FORMAT_LIST[slot-1].bits;
01215          break;
01216       }
01217    }
01218    if (ret & AST_FORMAT_AUDIO_MASK)
01219       return ret;
01220 
01221    ast_debug(4, "Could not find preferred codec - %s\n", find_best ? "Going for the best codec" : "Returning zero codec");
01222 
01223       return find_best ? ast_best_codec(formats) : 0;
01224 }
01225 
01226 int ast_parse_allow_disallow(struct ast_codec_pref *pref, int *mask, const char *list, int allowing) 
01227 {
01228    int errors = 0;
01229    char *parse = NULL, *this = NULL, *psize = NULL;
01230    int format = 0, framems = 0;
01231 
01232    parse = ast_strdupa(list);
01233    while ((this = strsep(&parse, ","))) {
01234       framems = 0;
01235       if ((psize = strrchr(this, ':'))) {
01236          *psize++ = '\0';
01237          ast_debug(1, "Packetization for codec: %s is %s\n", this, psize);
01238          framems = atoi(psize);
01239          if (framems < 0) {
01240             framems = 0;
01241             errors++;
01242             ast_log(LOG_WARNING, "Bad packetization value for codec %s\n", this);
01243          }
01244       }
01245       if (!(format = ast_getformatbyname(this))) {
01246          ast_log(LOG_WARNING, "Cannot %s unknown format '%s'\n", allowing ? "allow" : "disallow", this);
01247          errors++;
01248          continue;
01249       }
01250 
01251       if (mask) {
01252          if (allowing)
01253             *mask |= format;
01254          else
01255             *mask &= ~format;
01256       }
01257 
01258       /* Set up a preference list for audio. Do not include video in preferences 
01259          since we can not transcode video and have to use whatever is offered
01260        */
01261       if (pref && (format & AST_FORMAT_AUDIO_MASK)) {
01262          if (strcasecmp(this, "all")) {
01263             if (allowing) {
01264                ast_codec_pref_append(pref, format);
01265                ast_codec_pref_setsize(pref, format, framems);
01266             }
01267             else
01268                ast_codec_pref_remove(pref, format);
01269          } else if (!allowing) {
01270             memset(pref, 0, sizeof(*pref));
01271          }
01272       }
01273    }
01274    return errors;
01275 }
01276 
01277 static int g723_len(unsigned char buf)
01278 {
01279    enum frame_type type = buf & TYPE_MASK;
01280 
01281    switch(type) {
01282    case TYPE_DONTSEND:
01283       return 0;
01284       break;
01285    case TYPE_SILENCE:
01286       return 4;
01287       break;
01288    case TYPE_HIGH:
01289       return 24;
01290       break;
01291    case TYPE_LOW:
01292       return 20;
01293       break;
01294    default:
01295       ast_log(LOG_WARNING, "Badly encoded frame (%d)\n", type);
01296    }
01297    return -1;
01298 }
01299 
01300 static int g723_samples(unsigned char *buf, int maxlen)
01301 {
01302    int pos = 0;
01303    int samples = 0;
01304    int res;
01305    while(pos < maxlen) {
01306       res = g723_len(buf[pos]);
01307       if (res <= 0)
01308          break;
01309       samples += 240;
01310       pos += res;
01311    }
01312    return samples;
01313 }
01314 
01315 static unsigned char get_n_bits_at(unsigned char *data, int n, int bit)
01316 {
01317    int byte = bit / 8;       /* byte containing first bit */
01318    int rem = 8 - (bit % 8);  /* remaining bits in first byte */
01319    unsigned char ret = 0;
01320    
01321    if (n <= 0 || n > 8)
01322       return 0;
01323 
01324    if (rem < n) {
01325       ret = (data[byte] << (n - rem));
01326       ret |= (data[byte + 1] >> (8 - n + rem));
01327    } else {
01328       ret = (data[byte] >> (rem - n));
01329    }
01330 
01331    return (ret & (0xff >> (8 - n)));
01332 }
01333 
01334 static int speex_get_wb_sz_at(unsigned char *data, int len, int bit)
01335 {
01336    static int SpeexWBSubModeSz[] = {
01337       0, 36, 112, 192,
01338       352, 0, 0, 0 };
01339    int off = bit;
01340    unsigned char c;
01341 
01342    /* skip up to two wideband frames */
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          c = get_n_bits_at(data, 3, off + 1);
01351          off += SpeexWBSubModeSz[c];
01352 
01353          if (((len * 8 - off) >= 5) && 
01354             get_n_bits_at(data, 1, off)) {
01355             ast_log(LOG_WARNING, "Encountered corrupt speex frame; too many wideband frames in a row.\n");
01356             return -1;
01357          }
01358       }
01359 
01360    }
01361    return off - bit;
01362 }
01363 
01364 static int speex_samples(unsigned char *data, int len)
01365 {
01366    static int SpeexSubModeSz[] = {
01367       5, 43, 119, 160,
01368       220, 300, 364, 492, 
01369       79, 0, 0, 0,
01370       0, 0, 0, 0 };
01371    static int SpeexInBandSz[] = { 
01372       1, 1, 4, 4,
01373       4, 4, 4, 4,
01374       8, 8, 16, 16,
01375       32, 32, 64, 64 };
01376    int bit = 0;
01377    int cnt = 0;
01378    int off;
01379    unsigned char c;
01380 
01381    while ((len * 8 - bit) >= 5) {
01382       /* skip wideband frames */
01383       off = speex_get_wb_sz_at(data, len, bit);
01384       if (off < 0)  {
01385          ast_log(LOG_WARNING, "Had error while reading wideband frames for speex samples\n");
01386          break;
01387       }
01388       bit += off;
01389 
01390       if ((len * 8 - bit) < 5) {
01391          ast_log(LOG_WARNING, "Not enough bits remaining after wide band for speex samples.\n");
01392          break;
01393       }
01394 
01395       /* get control bits */
01396       c = get_n_bits_at(data, 5, bit);
01397       bit += 5;
01398 
01399       if (c == 15) { 
01400          /* terminator */
01401          break; 
01402       } else if (c == 14) {
01403          /* in-band signal; next 4 bits contain signal id */
01404          c = get_n_bits_at(data, 4, bit);
01405          bit += 4;
01406          bit += SpeexInBandSz[c];
01407       } else if (c == 13) {
01408          /* user in-band; next 5 bits contain msg len */
01409          c = get_n_bits_at(data, 5, bit);
01410          bit += 5;
01411          bit += c * 8;
01412       } else if (c > 8) {
01413          /* unknown */
01414          break;
01415       } else {
01416          /* skip number bits for submode (less the 5 control bits) */
01417          bit += SpeexSubModeSz[c] - 5;
01418          cnt += 160; /* new frame */
01419       }
01420    }
01421    return cnt;
01422 }
01423 
01424 int ast_codec_get_samples(struct ast_frame *f)
01425 {
01426    int samples=0;
01427    switch(f->subclass) {
01428    case AST_FORMAT_SPEEX:
01429       samples = speex_samples(f->data, f->datalen);
01430       break;
01431    case AST_FORMAT_G723_1:
01432       samples = g723_samples(f->data, f->datalen);
01433       break;
01434    case AST_FORMAT_ILBC:
01435       samples = 240 * (f->datalen / 50);
01436       break;
01437    case AST_FORMAT_GSM:
01438       samples = 160 * (f->datalen / 33);
01439       break;
01440    case AST_FORMAT_G729A:
01441       samples = f->datalen * 8;
01442       break;
01443    case AST_FORMAT_SLINEAR:
01444    case AST_FORMAT_SLINEAR16:
01445       samples = f->datalen / 2;
01446       break;
01447    case AST_FORMAT_LPC10:
01448       /* assumes that the RTP packet contains one LPC10 frame */
01449       samples = 22 * 8;
01450       samples += (((char *)(f->data))[7] & 0x1) * 8;
01451       break;
01452    case AST_FORMAT_ULAW:
01453    case AST_FORMAT_ALAW:
01454       samples = f->datalen;
01455       break;
01456    case AST_FORMAT_G722:
01457    case AST_FORMAT_ADPCM:
01458    case AST_FORMAT_G726:
01459    case AST_FORMAT_G726_AAL2:
01460       samples = f->datalen * 2;
01461       break;
01462    default:
01463       ast_log(LOG_WARNING, "Unable to calculate samples for format %s\n", ast_getformatname(f->subclass));
01464    }
01465    return samples;
01466 }
01467 
01468 int ast_codec_get_len(int format, int samples)
01469 {
01470    int len = 0;
01471 
01472    /* XXX Still need speex, g723, and lpc10 XXX */ 
01473    switch(format) {
01474    case AST_FORMAT_G723_1:
01475       len = (samples / 240) * 20;
01476       break;
01477    case AST_FORMAT_ILBC:
01478       len = (samples / 240) * 50;
01479       break;
01480    case AST_FORMAT_GSM:
01481       len = (samples / 160) * 33;
01482       break;
01483    case AST_FORMAT_G729A:
01484       len = samples / 8;
01485       break;
01486    case AST_FORMAT_SLINEAR:
01487    case AST_FORMAT_SLINEAR16:
01488       len = samples * 2;
01489       break;
01490    case AST_FORMAT_ULAW:
01491    case AST_FORMAT_ALAW:
01492       len = samples;
01493       break;
01494    case AST_FORMAT_G722:
01495    case AST_FORMAT_ADPCM:
01496    case AST_FORMAT_G726:
01497    case AST_FORMAT_G726_AAL2:
01498       len = samples / 2;
01499       break;
01500    default:
01501       ast_log(LOG_WARNING, "Unable to calculate sample length for format %s\n", ast_getformatname(format));
01502    }
01503 
01504    return len;
01505 }
01506 
01507 int ast_frame_adjust_volume(struct ast_frame *f, int adjustment)
01508 {
01509    int count;
01510    short *fdata = f->data;
01511    short adjust_value = abs(adjustment);
01512 
01513    if ((f->frametype != AST_FRAME_VOICE) || (f->subclass != AST_FORMAT_SLINEAR))
01514       return -1;
01515 
01516    if (!adjustment)
01517       return 0;
01518 
01519    for (count = 0; count < f->samples; count++) {
01520       if (adjustment > 0) {
01521          ast_slinear_saturated_multiply(&fdata[count], &adjust_value);
01522       } else if (adjustment < 0) {
01523          ast_slinear_saturated_divide(&fdata[count], &adjust_value);
01524       }
01525    }
01526 
01527    return 0;
01528 }
01529 
01530 int ast_frame_slinear_sum(struct ast_frame *f1, struct ast_frame *f2)
01531 {
01532    int count;
01533    short *data1, *data2;
01534 
01535    if ((f1->frametype != AST_FRAME_VOICE) || (f1->subclass != AST_FORMAT_SLINEAR))
01536       return -1;
01537 
01538    if ((f2->frametype != AST_FRAME_VOICE) || (f2->subclass != AST_FORMAT_SLINEAR))
01539       return -1;
01540 
01541    if (f1->samples != f2->samples)
01542       return -1;
01543 
01544    for (count = 0, data1 = f1->data, data2 = f2->data;
01545         count < f1->samples;
01546         count++, data1++, data2++)
01547       ast_slinear_saturated_add(data1, data2);
01548 
01549    return 0;
01550 }

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