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 * \brief Asterisk internal frame definitions. 00021 * \arg For an explanation of frames, see \ref Def_Frame 00022 * \arg Frames are send of Asterisk channels, see \ref Def_Channel 00023 */ 00024 00025 #ifndef _ASTERISK_FRAME_H 00026 #define _ASTERISK_FRAME_H 00027 00028 #if defined(__cplusplus) || defined(c_plusplus) 00029 extern "C" { 00030 #endif 00031 00032 #include <sys/time.h> 00033 00034 #include "asterisk/endian.h" 00035 #include "asterisk/linkedlists.h" 00036 00037 struct ast_codec_pref { 00038 char order[32]; 00039 char framing[32]; 00040 }; 00041 00042 /*! \page Def_Frame AST Multimedia and signalling frames 00043 \section Def_AstFrame What is an ast_frame ? 00044 A frame of data read used to communicate between 00045 between channels and applications. 00046 Frames are divided into frame types and subclasses. 00047 00048 \par Frame types 00049 \arg \b VOICE: Voice data, subclass is codec (AST_FORMAT_*) 00050 \arg \b VIDEO: Video data, subclass is codec (AST_FORMAT_*) 00051 \arg \b DTMF: A DTMF digit, subclass is the digit 00052 \arg \b IMAGE: Image transport, mostly used in IAX 00053 \arg \b TEXT: Text messages and character by character (real time text) 00054 \arg \b HTML: URL's and web pages 00055 \arg \b MODEM: Modulated data encodings, such as T.38 and V.150 00056 \arg \b IAX: Private frame type for the IAX protocol 00057 \arg \b CNG: Comfort noice frames 00058 \arg \b CONTROL: A control frame, subclass defined as AST_CONTROL_ 00059 \arg \b NULL: Empty, useless frame 00060 00061 \par Files 00062 \arg frame.h Definitions 00063 \arg frame.c Function library 00064 \arg \ref Def_Channel Asterisk channels 00065 \section Def_ControlFrame Control Frames 00066 Control frames send signalling information between channels 00067 and devices. They are prefixed with AST_CONTROL_, like AST_CONTROL_FRAME_HANGUP 00068 \arg \b HANGUP The other end has hungup 00069 \arg \b RING Local ring 00070 \arg \b RINGING The other end is ringing 00071 \arg \b ANSWER The other end has answered 00072 \arg \b BUSY Remote end is busy 00073 \arg \b TAKEOFFHOOK Make it go off hook (what's "it" ? ) 00074 \arg \b OFFHOOK Line is off hook 00075 \arg \b CONGESTION Congestion (circuit is busy, not available) 00076 \arg \b FLASH Other end sends flash hook 00077 \arg \b WINK Other end sends wink 00078 \arg \b OPTION Send low-level option 00079 \arg \b RADIO_KEY Key radio (see app_rpt.c) 00080 \arg \b RADIO_UNKEY Un-key radio (see app_rpt.c) 00081 \arg \b PROGRESS Other end indicates call progress 00082 \arg \b PROCEEDING Indicates proceeding 00083 \arg \b HOLD Call is placed on hold 00084 \arg \b UNHOLD Call is back from hold 00085 \arg \b VIDUPDATE Video update requested 00086 \arg \b SRCUPDATE The source of media has changed 00087 00088 */ 00089 00090 /*! 00091 * \brief Frame types 00092 * 00093 * \note It is important that the values of each frame type are never changed, 00094 * because it will break backwards compatability with older versions. 00095 * This is because these constants are transmitted directly over IAX2. 00096 */ 00097 enum ast_frame_type { 00098 /*! DTMF end event, subclass is the digit */ 00099 AST_FRAME_DTMF_END = 1, 00100 /*! Voice data, subclass is AST_FORMAT_* */ 00101 AST_FRAME_VOICE, 00102 /*! Video frame, maybe?? :) */ 00103 AST_FRAME_VIDEO, 00104 /*! A control frame, subclass is AST_CONTROL_* */ 00105 AST_FRAME_CONTROL, 00106 /*! An empty, useless frame */ 00107 AST_FRAME_NULL, 00108 /*! Inter Asterisk Exchange private frame type */ 00109 AST_FRAME_IAX, 00110 /*! Text messages */ 00111 AST_FRAME_TEXT, 00112 /*! Image Frames */ 00113 AST_FRAME_IMAGE, 00114 /*! HTML Frame */ 00115 AST_FRAME_HTML, 00116 /*! Comfort Noise frame (subclass is level of CNG in -dBov), 00117 body may include zero or more 8-bit quantization coefficients */ 00118 AST_FRAME_CNG, 00119 /*! Modem-over-IP data streams */ 00120 AST_FRAME_MODEM, 00121 /*! DTMF begin event, subclass is the digit */ 00122 AST_FRAME_DTMF_BEGIN, 00123 }; 00124 #define AST_FRAME_DTMF AST_FRAME_DTMF_END 00125 00126 enum { 00127 /*! This frame contains valid timing information */ 00128 AST_FRFLAG_HAS_TIMING_INFO = (1 << 0), 00129 /*! This frame came from a translator and is still the original frame. 00130 * The translator can not be free'd if the frame inside of it still has 00131 * this flag set. */ 00132 AST_FRFLAG_FROM_TRANSLATOR = (1 << 1), 00133 /*! This frame came from a dsp and is still the original frame. 00134 * The dsp cannot be free'd if the frame inside of it still has 00135 * this flag set. */ 00136 AST_FRFLAG_FROM_DSP = (1 << 2), 00137 /*! This frame came from a filestream and is still the original frame. 00138 * The filestream cannot be free'd if the frame inside of it still has 00139 * this flag set. */ 00140 AST_FRFLAG_FROM_FILESTREAM = (1 << 3), 00141 }; 00142 00143 /*! \brief Data structure associated with a single frame of data 00144 */ 00145 struct ast_frame { 00146 /*! Kind of frame */ 00147 enum ast_frame_type frametype; 00148 /*! Subclass, frame dependent */ 00149 int subclass; 00150 /*! Length of data */ 00151 int datalen; 00152 /*! Number of 8khz samples in this frame */ 00153 int samples; 00154 /*! Was the data malloc'd? i.e. should we free it when we discard the frame? */ 00155 int mallocd; 00156 /*! The number of bytes allocated for a malloc'd frame header */ 00157 size_t mallocd_hdr_len; 00158 /*! How many bytes exist _before_ "data" that can be used if needed */ 00159 int offset; 00160 /*! Optional source of frame for debugging */ 00161 const char *src; 00162 /*! Pointer to actual data */ 00163 void *data; 00164 /*! Global delivery time */ 00165 struct timeval delivery; 00166 /*! For placing in a linked list */ 00167 AST_LIST_ENTRY(ast_frame) frame_list; 00168 /*! Misc. frame flags */ 00169 unsigned int flags; 00170 /*! Timestamp in milliseconds */ 00171 long ts; 00172 /*! Length in milliseconds */ 00173 long len; 00174 /*! Sequence number */ 00175 int seqno; 00176 }; 00177 00178 /*! 00179 * Set the various field of a frame to point to a buffer. 00180 * Typically you set the base address of the buffer, the offset as 00181 * AST_FRIENDLY_OFFSET, and the datalen as the amount of bytes queued. 00182 * The remaining things (to be done manually) is set the number of 00183 * samples, which cannot be derived from the datalen unless you know 00184 * the number of bits per sample. 00185 */ 00186 #define AST_FRAME_SET_BUFFER(fr, _base, _ofs, _datalen) \ 00187 { \ 00188 (fr)->data = (char *)_base + (_ofs); \ 00189 (fr)->offset = (_ofs); \ 00190 (fr)->datalen = (_datalen); \ 00191 } 00192 00193 /*! Queueing a null frame is fairly common, so we declare a global null frame object 00194 for this purpose instead of having to declare one on the stack */ 00195 extern struct ast_frame ast_null_frame; 00196 00197 /*! \brief Offset into a frame's data buffer. 00198 * 00199 * By providing some "empty" space prior to the actual data of an ast_frame, 00200 * this gives any consumer of the frame ample space to prepend other necessary 00201 * information without having to create a new buffer. 00202 * 00203 * As an example, RTP can use the data from an ast_frame and simply prepend the 00204 * RTP header information into the space provided by AST_FRIENDLY_OFFSET instead 00205 * of having to create a new buffer with the necessary space allocated. 00206 */ 00207 #define AST_FRIENDLY_OFFSET 64 00208 #define AST_MIN_OFFSET 32 /*! Make sure we keep at least this much handy */ 00209 00210 /*! Need the header be free'd? */ 00211 #define AST_MALLOCD_HDR (1 << 0) 00212 /*! Need the data be free'd? */ 00213 #define AST_MALLOCD_DATA (1 << 1) 00214 /*! Need the source be free'd? (haha!) */ 00215 #define AST_MALLOCD_SRC (1 << 2) 00216 00217 /* MODEM subclasses */ 00218 /*! T.38 Fax-over-IP */ 00219 #define AST_MODEM_T38 1 00220 /*! V.150 Modem-over-IP */ 00221 #define AST_MODEM_V150 2 00222 00223 /* HTML subclasses */ 00224 /*! Sending a URL */ 00225 #define AST_HTML_URL 1 00226 /*! Data frame */ 00227 #define AST_HTML_DATA 2 00228 /*! Beginning frame */ 00229 #define AST_HTML_BEGIN 4 00230 /*! End frame */ 00231 #define AST_HTML_END 8 00232 /*! Load is complete */ 00233 #define AST_HTML_LDCOMPLETE 16 00234 /*! Peer is unable to support HTML */ 00235 #define AST_HTML_NOSUPPORT 17 00236 /*! Send URL, and track */ 00237 #define AST_HTML_LINKURL 18 00238 /*! No more HTML linkage */ 00239 #define AST_HTML_UNLINK 19 00240 /*! Reject link request */ 00241 #define AST_HTML_LINKREJECT 20 00242 00243 /* Data formats for capabilities and frames alike */ 00244 /*! G.723.1 compression */ 00245 #define AST_FORMAT_G723_1 (1 << 0) 00246 /*! GSM compression */ 00247 #define AST_FORMAT_GSM (1 << 1) 00248 /*! Raw mu-law data (G.711) */ 00249 #define AST_FORMAT_ULAW (1 << 2) 00250 /*! Raw A-law data (G.711) */ 00251 #define AST_FORMAT_ALAW (1 << 3) 00252 /*! ADPCM (G.726, 32kbps, AAL2 codeword packing) */ 00253 #define AST_FORMAT_G726_AAL2 (1 << 4) 00254 /*! ADPCM (IMA) */ 00255 #define AST_FORMAT_ADPCM (1 << 5) 00256 /*! Raw 16-bit Signed Linear (8000 Hz) PCM */ 00257 #define AST_FORMAT_SLINEAR (1 << 6) 00258 /*! LPC10, 180 samples/frame */ 00259 #define AST_FORMAT_LPC10 (1 << 7) 00260 /*! G.729A audio */ 00261 #define AST_FORMAT_G729A (1 << 8) 00262 /*! SpeeX Free Compression */ 00263 #define AST_FORMAT_SPEEX (1 << 9) 00264 /*! iLBC Free Compression */ 00265 #define AST_FORMAT_ILBC (1 << 10) 00266 /*! ADPCM (G.726, 32kbps, RFC3551 codeword packing) */ 00267 #define AST_FORMAT_G726 (1 << 11) 00268 /*! G.722 */ 00269 #define AST_FORMAT_G722 (1 << 12) 00270 /*! Unsupported audio bits */ 00271 #define AST_FORMAT_AUDIO_UNDEFINED ((1 << 13) | (1 << 14)) 00272 /*! Raw 16-bit Signed Linear (16000 Hz) PCM */ 00273 #define AST_FORMAT_SLINEAR16 (1 << 15) 00274 /*! Maximum audio mask */ 00275 #define AST_FORMAT_AUDIO_MASK ((1 << 16)-1) 00276 /*! JPEG Images */ 00277 #define AST_FORMAT_JPEG (1 << 16) 00278 /*! PNG Images */ 00279 #define AST_FORMAT_PNG (1 << 17) 00280 /*! H.261 Video */ 00281 #define AST_FORMAT_H261 (1 << 18) 00282 /*! H.263 Video */ 00283 #define AST_FORMAT_H263 (1 << 19) 00284 /*! H.263+ Video */ 00285 #define AST_FORMAT_H263_PLUS (1 << 20) 00286 /*! H.264 Video */ 00287 #define AST_FORMAT_H264 (1 << 21) 00288 /*! MPEG4 Video */ 00289 #define AST_FORMAT_MP4_VIDEO (1 << 22) 00290 #define AST_FORMAT_VIDEO_MASK (((1 << 25)-1) & ~(AST_FORMAT_AUDIO_MASK)) 00291 /*! T.140 Text format - ITU T.140, RFC 4351*/ 00292 #define AST_FORMAT_T140 (1 << 25) 00293 #define AST_FORMAT_TEXT_MASK (((1 << 30)-1) & ~(AST_FORMAT_AUDIO_MASK) & ~(AST_FORMAT_VIDEO_MASK)) 00294 00295 enum ast_control_frame_type { 00296 AST_CONTROL_HANGUP = 1, /*!< Other end has hungup */ 00297 AST_CONTROL_RING = 2, /*!< Local ring */ 00298 AST_CONTROL_RINGING = 3, /*!< Remote end is ringing */ 00299 AST_CONTROL_ANSWER = 4, /*!< Remote end has answered */ 00300 AST_CONTROL_BUSY = 5, /*!< Remote end is busy */ 00301 AST_CONTROL_TAKEOFFHOOK = 6, /*!< Make it go off hook */ 00302 AST_CONTROL_OFFHOOK = 7, /*!< Line is off hook */ 00303 AST_CONTROL_CONGESTION = 8, /*!< Congestion (circuits busy) */ 00304 AST_CONTROL_FLASH = 9, /*!< Flash hook */ 00305 AST_CONTROL_WINK = 10, /*!< Wink */ 00306 AST_CONTROL_OPTION = 11, /*!< Set a low-level option */ 00307 AST_CONTROL_RADIO_KEY = 12, /*!< Key Radio */ 00308 AST_CONTROL_RADIO_UNKEY = 13, /*!< Un-Key Radio */ 00309 AST_CONTROL_PROGRESS = 14, /*!< Indicate PROGRESS */ 00310 AST_CONTROL_PROCEEDING = 15, /*!< Indicate CALL PROCEEDING */ 00311 AST_CONTROL_HOLD = 16, /*!< Indicate call is placed on hold */ 00312 AST_CONTROL_UNHOLD = 17, /*!< Indicate call is left from hold */ 00313 AST_CONTROL_VIDUPDATE = 18, /*!< Indicate video frame update */ 00314 AST_CONTROL_T38 = 19, /*!< T38 state change request/notification */ 00315 AST_CONTROL_SRCUPDATE = 20, /*!< Indicate source of media has changed */ 00316 }; 00317 00318 enum ast_control_t38 { 00319 AST_T38_REQUEST_NEGOTIATE = 1, /*!< Request T38 on a channel (voice to fax) */ 00320 AST_T38_REQUEST_TERMINATE, /*!< Terminate T38 on a channel (fax to voice) */ 00321 AST_T38_NEGOTIATED, /*!< T38 negotiated (fax mode) */ 00322 AST_T38_TERMINATED, /*!< T38 terminated (back to voice) */ 00323 AST_T38_REFUSED /*!< T38 refused for some reason (usually rejected by remote end) */ 00324 }; 00325 00326 #define AST_SMOOTHER_FLAG_G729 (1 << 0) 00327 #define AST_SMOOTHER_FLAG_BE (1 << 1) 00328 00329 /* Option identifiers and flags */ 00330 #define AST_OPTION_FLAG_REQUEST 0 00331 #define AST_OPTION_FLAG_ACCEPT 1 00332 #define AST_OPTION_FLAG_REJECT 2 00333 #define AST_OPTION_FLAG_QUERY 4 00334 #define AST_OPTION_FLAG_ANSWER 5 00335 #define AST_OPTION_FLAG_WTF 6 00336 00337 /*! Verify touchtones by muting audio transmission 00338 (and reception) and verify the tone is still present */ 00339 #define AST_OPTION_TONE_VERIFY 1 00340 00341 /*! Put a compatible channel into TDD (TTY for the hearing-impared) mode */ 00342 #define AST_OPTION_TDD 2 00343 00344 /*! Relax the parameters for DTMF reception (mainly for radio use) */ 00345 #define AST_OPTION_RELAXDTMF 3 00346 00347 /*! Set (or clear) Audio (Not-Clear) Mode */ 00348 #define AST_OPTION_AUDIO_MODE 4 00349 00350 /*! Set channel transmit gain 00351 * Option data is a single signed char 00352 representing number of decibels (dB) 00353 to set gain to (on top of any gain 00354 specified in channel driver) 00355 */ 00356 #define AST_OPTION_TXGAIN 5 00357 00358 /*! Set channel receive gain 00359 * Option data is a single signed char 00360 representing number of decibels (dB) 00361 to set gain to (on top of any gain 00362 specified in channel driver) 00363 */ 00364 #define AST_OPTION_RXGAIN 6 00365 00366 /* set channel into "Operator Services" mode */ 00367 #define AST_OPTION_OPRMODE 7 00368 00369 /*! Explicitly enable or disable echo cancelation for the given channel */ 00370 #define AST_OPTION_ECHOCAN 8 00371 00372 /* ! 00373 * Read-only. Allows query current status of T38 on the channel. 00374 * data: ast_t38state 00375 */ 00376 #define AST_OPTION_T38_STATE 10 00377 00378 struct oprmode { 00379 struct ast_channel *peer; 00380 int mode; 00381 } ; 00382 00383 struct ast_option_header { 00384 /* Always keep in network byte order */ 00385 #if __BYTE_ORDER == __BIG_ENDIAN 00386 uint16_t flag:3; 00387 uint16_t option:13; 00388 #else 00389 #if __BYTE_ORDER == __LITTLE_ENDIAN 00390 uint16_t option:13; 00391 uint16_t flag:3; 00392 #else 00393 #error Byte order not defined 00394 #endif 00395 #endif 00396 uint8_t data[0]; 00397 }; 00398 00399 00400 /*! \brief Definition of supported media formats (codecs) */ 00401 struct ast_format_list { 00402 int bits; /*!< bitmask value */ 00403 char *name; /*!< short name */ 00404 int samplespersecond; /*!< Number of samples per second (8000/16000) */ 00405 char *desc; /*!< Description */ 00406 int fr_len; /*!< Single frame length in bytes */ 00407 int min_ms; /*!< Min value */ 00408 int max_ms; /*!< Max value */ 00409 int inc_ms; /*!< Increment */ 00410 int def_ms; /*!< Default value */ 00411 unsigned int flags; /*!< Smoother flags */ 00412 int cur_ms; /*!< Current value */ 00413 }; 00414 00415 00416 /*! \brief Requests a frame to be allocated 00417 * 00418 * \param source 00419 * Request a frame be allocated. source is an optional source of the frame, 00420 * len is the requested length, or "0" if the caller will supply the buffer 00421 */ 00422 #if 0 /* Unimplemented */ 00423 struct ast_frame *ast_fralloc(char *source, int len); 00424 #endif 00425 00426 /*! 00427 * \brief Frees a frame or list of frames 00428 * 00429 * \param fr Frame to free, or head of list to free 00430 * \param cache Whether to consider this frame for frame caching 00431 */ 00432 void ast_frame_free(struct ast_frame *fr, int cache); 00433 00434 #define ast_frfree(fr) ast_frame_free(fr, 1) 00435 00436 /*! \brief Makes a frame independent of any static storage 00437 * \param fr frame to act upon 00438 * Take a frame, and if it's not been malloc'd, make a malloc'd copy 00439 * and if the data hasn't been malloced then make the 00440 * data malloc'd. If you need to store frames, say for queueing, then 00441 * you should call this function. 00442 * \return Returns a frame on success, NULL on error 00443 * \note This function may modify the frame passed to it, so you must 00444 * not assume the frame will be intact after the isolated frame has 00445 * been produced. In other words, calling this function on a frame 00446 * should be the last operation you do with that frame before freeing 00447 * it (or exiting the block, if the frame is on the stack.) 00448 */ 00449 struct ast_frame *ast_frisolate(struct ast_frame *fr); 00450 00451 /*! \brief Copies a frame 00452 * \param fr frame to copy 00453 * Duplicates a frame -- should only rarely be used, typically frisolate is good enough 00454 * \return Returns a frame on success, NULL on error 00455 */ 00456 struct ast_frame *ast_frdup(const struct ast_frame *fr); 00457 00458 void ast_swapcopy_samples(void *dst, const void *src, int samples); 00459 00460 /* Helpers for byteswapping native samples to/from 00461 little-endian and big-endian. */ 00462 #if __BYTE_ORDER == __LITTLE_ENDIAN 00463 #define ast_frame_byteswap_le(fr) do { ; } while(0) 00464 #define ast_frame_byteswap_be(fr) do { struct ast_frame *__f = (fr); ast_swapcopy_samples(__f->data, __f->data, __f->samples); } while(0) 00465 #else 00466 #define ast_frame_byteswap_le(fr) do { struct ast_frame *__f = (fr); ast_swapcopy_samples(__f->data, __f->data, __f->samples); } while(0) 00467 #define ast_frame_byteswap_be(fr) do { ; } while(0) 00468 #endif 00469 00470 00471 /*! \brief Get the name of a format 00472 * \param format id of format 00473 * \return A static string containing the name of the format or "unknown" if unknown. 00474 */ 00475 char* ast_getformatname(int format); 00476 00477 /*! \brief Get the names of a set of formats 00478 * \param buf a buffer for the output string 00479 * \param size size of buf (bytes) 00480 * \param format the format (combined IDs of codecs) 00481 * Prints a list of readable codec names corresponding to "format". 00482 * ex: for format=AST_FORMAT_GSM|AST_FORMAT_SPEEX|AST_FORMAT_ILBC it will return "0x602 (GSM|SPEEX|ILBC)" 00483 * \return The return value is buf. 00484 */ 00485 char* ast_getformatname_multiple(char *buf, size_t size, int format); 00486 00487 /*! 00488 * \brief Gets a format from a name. 00489 * \param name string of format 00490 * \return This returns the form of the format in binary on success, 0 on error. 00491 */ 00492 int ast_getformatbyname(const char *name); 00493 00494 /*! \brief Get a name from a format 00495 * Gets a name from a format 00496 * \param codec codec number (1,2,4,8,16,etc.) 00497 * \return This returns a static string identifying the format on success, 0 on error. 00498 */ 00499 char *ast_codec2str(int codec); 00500 00501 /*! \name AST_Smoother 00502 */ 00503 /*@{ */ 00504 /*! \page ast_smooth The AST Frame Smoother 00505 The ast_smoother interface was designed specifically 00506 to take frames of variant sizes and produce frames of a single expected 00507 size, precisely what you want to do. 00508 00509 The basic interface is: 00510 00511 - Initialize with ast_smoother_new() 00512 - Queue input frames with ast_smoother_feed() 00513 - Get output frames with ast_smoother_read() 00514 - when you're done, free the structure with ast_smoother_free() 00515 - Also see ast_smoother_test_flag(), ast_smoother_set_flags(), ast_smoother_get_flags(), ast_smoother_reset() 00516 */ 00517 struct ast_smoother; 00518 00519 struct ast_smoother *ast_smoother_new(int bytes); 00520 void ast_smoother_set_flags(struct ast_smoother *smoother, int flags); 00521 int ast_smoother_get_flags(struct ast_smoother *smoother); 00522 int ast_smoother_test_flag(struct ast_smoother *s, int flag); 00523 void ast_smoother_free(struct ast_smoother *s); 00524 void ast_smoother_reset(struct ast_smoother *s, int bytes); 00525 00526 /*! 00527 * \brief Reconfigure an existing smoother to output a different number of bytes per frame 00528 * \param s the smoother to reconfigure 00529 * \param bytes the desired number of bytes per output frame 00530 * \return nothing 00531 * 00532 */ 00533 void ast_smoother_reconfigure(struct ast_smoother *s, int bytes); 00534 00535 int __ast_smoother_feed(struct ast_smoother *s, struct ast_frame *f, int swap); 00536 struct ast_frame *ast_smoother_read(struct ast_smoother *s); 00537 #define ast_smoother_feed(s,f) __ast_smoother_feed(s, f, 0) 00538 #if __BYTE_ORDER == __LITTLE_ENDIAN 00539 #define ast_smoother_feed_be(s,f) __ast_smoother_feed(s, f, 1) 00540 #define ast_smoother_feed_le(s,f) __ast_smoother_feed(s, f, 0) 00541 #else 00542 #define ast_smoother_feed_be(s,f) __ast_smoother_feed(s, f, 0) 00543 #define ast_smoother_feed_le(s,f) __ast_smoother_feed(s, f, 1) 00544 #endif 00545 /*@} Doxygen marker */ 00546 00547 struct ast_format_list *ast_get_format_list_index(int index); 00548 struct ast_format_list *ast_get_format_list(size_t *size); 00549 void ast_frame_dump(const char *name, struct ast_frame *f, char *prefix); 00550 00551 /*! \page AudioCodecPref Audio Codec Preferences 00552 00553 In order to negotiate audio codecs in the order they are configured 00554 in <channel>.conf for a device, we set up codec preference lists 00555 in addition to the codec capabilities setting. The capabilities 00556 setting is a bitmask of audio and video codecs with no internal 00557 order. This will reflect the offer given to the other side, where 00558 the prefered codecs will be added to the top of the list in the 00559 order indicated by the "allow" lines in the device configuration. 00560 00561 Video codecs are not included in the preference lists since they 00562 can't be transcoded and we just have to pick whatever is supported 00563 */ 00564 00565 /*! 00566 *\brief Initialize an audio codec preference to "no preference". 00567 * \arg \ref AudioCodecPref 00568 */ 00569 void ast_codec_pref_init(struct ast_codec_pref *pref); 00570 00571 /*! 00572 * \brief Codec located at a particular place in the preference index. 00573 * \arg \ref AudioCodecPref 00574 */ 00575 int ast_codec_pref_index(struct ast_codec_pref *pref, int index); 00576 00577 /*! \brief Remove audio a codec from a preference list */ 00578 void ast_codec_pref_remove(struct ast_codec_pref *pref, int format); 00579 00580 /*! \brief Append a audio codec to a preference list, removing it first if it was already there 00581 */ 00582 int ast_codec_pref_append(struct ast_codec_pref *pref, int format); 00583 00584 /*! \brief Prepend an audio codec to a preference list, removing it first if it was already there 00585 */ 00586 void ast_codec_pref_prepend(struct ast_codec_pref *pref, int format, int only_if_existing); 00587 00588 /*! \brief Select the best audio format according to preference list from supplied options. 00589 If "find_best" is non-zero then if nothing is found, the "Best" format of 00590 the format list is selected, otherwise 0 is returned. */ 00591 int ast_codec_choose(struct ast_codec_pref *pref, int formats, int find_best); 00592 00593 /*! \brief Set packet size for codec 00594 */ 00595 int ast_codec_pref_setsize(struct ast_codec_pref *pref, int format, int framems); 00596 00597 /*! \brief Get packet size for codec 00598 */ 00599 struct ast_format_list ast_codec_pref_getsize(struct ast_codec_pref *pref, int format); 00600 00601 /*! \brief Parse an "allow" or "deny" line in a channel or device configuration 00602 and update the capabilities mask and pref if provided. 00603 Video codecs are not added to codec preference lists, since we can not transcode 00604 \return Returns number of errors encountered during parsing 00605 */ 00606 int ast_parse_allow_disallow(struct ast_codec_pref *pref, int *mask, const char *list, int allowing); 00607 00608 /*! \brief Dump audio codec preference list into a string */ 00609 int ast_codec_pref_string(struct ast_codec_pref *pref, char *buf, size_t size); 00610 00611 /*! \brief Shift an audio codec preference list up or down 65 bytes so that it becomes an ASCII string */ 00612 void ast_codec_pref_convert(struct ast_codec_pref *pref, char *buf, size_t size, int right); 00613 00614 /*! \brief Returns the number of samples contained in the frame */ 00615 int ast_codec_get_samples(struct ast_frame *f); 00616 00617 /*! \brief Returns the number of bytes for the number of samples of the given format */ 00618 int ast_codec_get_len(int format, int samples); 00619 00620 /*! \brief Appends a frame to the end of a list of frames, truncating the maximum length of the list */ 00621 struct ast_frame *ast_frame_enqueue(struct ast_frame *head, struct ast_frame *f, int maxlen, int dupe); 00622 00623 00624 /*! \brief Gets duration in ms of interpolation frame for a format */ 00625 static inline int ast_codec_interp_len(int format) 00626 { 00627 return (format == AST_FORMAT_ILBC) ? 30 : 20; 00628 } 00629 00630 /*! 00631 \brief Adjusts the volume of the audio samples contained in a frame. 00632 \param f The frame containing the samples (must be AST_FRAME_VOICE and AST_FORMAT_SLINEAR) 00633 \param adjustment The number of dB to adjust up or down. 00634 \return 0 for success, non-zero for an error 00635 */ 00636 int ast_frame_adjust_volume(struct ast_frame *f, int adjustment); 00637 00638 /*! 00639 \brief Sums two frames of audio samples. 00640 \param f1 The first frame (which will contain the result) 00641 \param f2 The second frame 00642 \return 0 for success, non-zero for an error 00643 00644 The frames must be AST_FRAME_VOICE and must contain AST_FORMAT_SLINEAR samples, 00645 and must contain the same number of samples. 00646 */ 00647 int ast_frame_slinear_sum(struct ast_frame *f1, struct ast_frame *f2); 00648 00649 /*! 00650 * \brief Get the sample rate for a given format. 00651 */ 00652 static force_inline int ast_format_rate(int format) 00653 { 00654 if (format == AST_FORMAT_G722 || format == AST_FORMAT_SLINEAR16) 00655 return 16000; 00656 00657 return 8000; 00658 } 00659 00660 #if defined(__cplusplus) || defined(c_plusplus) 00661 } 00662 #endif 00663 00664 #endif /* _ASTERISK_FRAME_H */