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1 /* Copyright (C) 2002-2006 Jean-Marc Valin*/
2 /**
3   @file speex.h
4   @brief Describes the different modes of the codec
5 */
6 /*
7    Redistribution and use in source and binary forms, with or without
8    modification, are permitted provided that the following conditions
9    are met:
10 
11    - Redistributions of source code must retain the above copyright
12    notice, this list of conditions and the following disclaimer.
13 
14    - Redistributions in binary form must reproduce the above copyright
15    notice, this list of conditions and the following disclaimer in the
16    documentation and/or other materials provided with the distribution.
17 
18    - Neither the name of the Xiph.org Foundation nor the names of its
19    contributors may be used to endorse or promote products derived from
20    this software without specific prior written permission.
21 
22    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
25    A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
26    CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
27    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
28    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
29    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
30    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
31    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
32    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 
34 */
35 
36 #ifndef SPEEX_H
37 #define SPEEX_H
38 /** @defgroup Codec Speex encoder and decoder
39  *  This is the Speex codec itself.
40  *  @{
41  */
42 
43 #include "speex/speex_bits.h"
44 #include "speex/speex_types.h"
45 
46 #ifdef __cplusplus
47 extern "C" {
48 #endif
49 
50 /* Values allowed for *ctl() requests */
51 
52 /** Set enhancement on/off (decoder only) */
53 #define SPEEX_SET_ENH 0
54 /** Get enhancement state (decoder only) */
55 #define SPEEX_GET_ENH 1
56 
57 /*Would be SPEEX_SET_FRAME_SIZE, but it's (currently) invalid*/
58 /** Obtain frame size used by encoder/decoder */
59 #define SPEEX_GET_FRAME_SIZE 3
60 
61 /** Set quality value */
62 #define SPEEX_SET_QUALITY 4
63 /** Get current quality setting */
64 /* #define SPEEX_GET_QUALITY 5 -- Doesn't make much sense, does it? */
65 
66 /** Set sub-mode to use */
67 #define SPEEX_SET_MODE 6
68 /** Get current sub-mode in use */
69 #define SPEEX_GET_MODE 7
70 
71 /** Set low-band sub-mode to use (wideband only)*/
72 #define SPEEX_SET_LOW_MODE 8
73 /** Get current low-band mode in use (wideband only)*/
74 #define SPEEX_GET_LOW_MODE 9
75 
76 /** Set high-band sub-mode to use (wideband only)*/
77 #define SPEEX_SET_HIGH_MODE 10
78 /** Get current high-band mode in use (wideband only)*/
79 #define SPEEX_GET_HIGH_MODE 11
80 
81 /** Set VBR on (1) or off (0) */
82 #define SPEEX_SET_VBR 12
83 /** Get VBR status (1 for on, 0 for off) */
84 #define SPEEX_GET_VBR 13
85 
86 /** Set quality value for VBR encoding (0-10) */
87 #define SPEEX_SET_VBR_QUALITY 14
88 /** Get current quality value for VBR encoding (0-10) */
89 #define SPEEX_GET_VBR_QUALITY 15
90 
91 /** Set complexity of the encoder (0-10) */
92 #define SPEEX_SET_COMPLEXITY 16
93 /** Get current complexity of the encoder (0-10) */
94 #define SPEEX_GET_COMPLEXITY 17
95 
96 /** Set bit-rate used by the encoder (or lower) */
97 #define SPEEX_SET_BITRATE 18
98 /** Get current bit-rate used by the encoder or decoder */
99 #define SPEEX_GET_BITRATE 19
100 
101 /** Define a handler function for in-band Speex request*/
102 #define SPEEX_SET_HANDLER 20
103 
104 /** Define a handler function for in-band user-defined request*/
105 #define SPEEX_SET_USER_HANDLER 22
106 
107 /** Set sampling rate used in bit-rate computation */
108 #define SPEEX_SET_SAMPLING_RATE 24
109 /** Get sampling rate used in bit-rate computation */
110 #define SPEEX_GET_SAMPLING_RATE 25
111 
112 /** Reset the encoder/decoder memories to zero*/
113 #define SPEEX_RESET_STATE 26
114 
115 /** Get VBR info (mostly used internally) */
116 #define SPEEX_GET_RELATIVE_QUALITY 29
117 
118 /** Set VAD status (1 for on, 0 for off) */
119 #define SPEEX_SET_VAD 30
120 
121 /** Get VAD status (1 for on, 0 for off) */
122 #define SPEEX_GET_VAD 31
123 
124 /** Set Average Bit-Rate (ABR) to n bits per seconds */
125 #define SPEEX_SET_ABR 32
126 /** Get Average Bit-Rate (ABR) setting (in bps) */
127 #define SPEEX_GET_ABR 33
128 
129 /** Set DTX status (1 for on, 0 for off) */
130 #define SPEEX_SET_DTX 34
131 /** Get DTX status (1 for on, 0 for off) */
132 #define SPEEX_GET_DTX 35
133 
134 /** Set submode encoding in each frame (1 for yes, 0 for no, setting to no breaks the standard) */
135 #define SPEEX_SET_SUBMODE_ENCODING 36
136 /** Get submode encoding in each frame */
137 #define SPEEX_GET_SUBMODE_ENCODING 37
138 
139 /*#define SPEEX_SET_LOOKAHEAD 38*/
140 /** Returns the lookahead used by Speex */
141 #define SPEEX_GET_LOOKAHEAD 39
142 
143 /** Sets tuning for packet-loss concealment (expected loss rate) */
144 #define SPEEX_SET_PLC_TUNING 40
145 /** Gets tuning for PLC */
146 #define SPEEX_GET_PLC_TUNING 41
147 
148 /** Sets the max bit-rate allowed in VBR mode */
149 #define SPEEX_SET_VBR_MAX_BITRATE 42
150 /** Gets the max bit-rate allowed in VBR mode */
151 #define SPEEX_GET_VBR_MAX_BITRATE 43
152 
153 /** Turn on/off input/output high-pass filtering */
154 #define SPEEX_SET_HIGHPASS 44
155 /** Get status of input/output high-pass filtering */
156 #define SPEEX_GET_HIGHPASS 45
157 
158 /** Get "activity level" of the last decoded frame, i.e.
159     how much damage we cause if we remove the frame */
160 #define SPEEX_GET_ACTIVITY 47
161 
162 
163 /* Preserving compatibility:*/
164 /** Equivalent to SPEEX_SET_ENH */
165 #define SPEEX_SET_PF 0
166 /** Equivalent to SPEEX_GET_ENH */
167 #define SPEEX_GET_PF 1
168 
169 
170 
171 
172 /* Values allowed for mode queries */
173 /** Query the frame size of a mode */
174 #define SPEEX_MODE_FRAME_SIZE 0
175 
176 /** Query the size of an encoded frame for a particular sub-mode */
177 #define SPEEX_SUBMODE_BITS_PER_FRAME 1
178 
179 
180 
181 /** Get major Speex version */
182 #define SPEEX_LIB_GET_MAJOR_VERSION 1
183 /** Get minor Speex version */
184 #define SPEEX_LIB_GET_MINOR_VERSION 3
185 /** Get micro Speex version */
186 #define SPEEX_LIB_GET_MICRO_VERSION 5
187 /** Get extra Speex version */
188 #define SPEEX_LIB_GET_EXTRA_VERSION 7
189 /** Get Speex version string */
190 #define SPEEX_LIB_GET_VERSION_STRING 9
191 
192 /*#define SPEEX_LIB_SET_ALLOC_FUNC 10
193 #define SPEEX_LIB_GET_ALLOC_FUNC 11
194 #define SPEEX_LIB_SET_FREE_FUNC 12
195 #define SPEEX_LIB_GET_FREE_FUNC 13
196 
197 #define SPEEX_LIB_SET_WARNING_FUNC 14
198 #define SPEEX_LIB_GET_WARNING_FUNC 15
199 #define SPEEX_LIB_SET_ERROR_FUNC 16
200 #define SPEEX_LIB_GET_ERROR_FUNC 17
201 */
202 
203 /** Number of defined modes in Speex */
204 #define SPEEX_NB_MODES 3
205 
206 /** modeID for the defined narrowband mode */
207 #define SPEEX_MODEID_NB 0
208 
209 /** modeID for the defined wideband mode */
210 #define SPEEX_MODEID_WB 1
211 
212 /** modeID for the defined ultra-wideband mode */
213 #define SPEEX_MODEID_UWB 2
214 
215 struct SpeexMode;
216 
217 
218 /* Prototypes for mode function pointers */
219 
220 /** Encoder state initialization function */
221 typedef void *(*encoder_init_func)(const struct SpeexMode *mode);
222 
223 /** Encoder state destruction function */
224 typedef void (*encoder_destroy_func)(void *st);
225 
226 /** Main encoding function */
227 typedef int (*encode_func)(void *state, void *in, SpeexBits *bits);
228 
229 /** Function for controlling the encoder options */
230 typedef int (*encoder_ctl_func)(void *state, int request, void *ptr);
231 
232 /** Decoder state initialization function */
233 typedef void *(*decoder_init_func)(const struct SpeexMode *mode);
234 
235 /** Decoder state destruction function */
236 typedef void (*decoder_destroy_func)(void *st);
237 
238 /** Main decoding function */
239 typedef int  (*decode_func)(void *state, SpeexBits *bits, void *out);
240 
241 /** Function for controlling the decoder options */
242 typedef int (*decoder_ctl_func)(void *state, int request, void *ptr);
243 
244 
245 /** Query function for a mode */
246 typedef int (*mode_query_func)(const void *mode, int request, void *ptr);
247 
248 /** Struct defining a Speex mode */
249 typedef struct SpeexMode {
250    /** Pointer to the low-level mode data */
251    const void *mode;
252 
253    /** Pointer to the mode query function */
254    mode_query_func query;
255 
256    /** The name of the mode (you should not rely on this to identify the mode)*/
257    const char *modeName;
258 
259    /**ID of the mode*/
260    int modeID;
261 
262    /**Version number of the bitstream (incremented every time we break
263     bitstream compatibility*/
264    int bitstream_version;
265 
266    /** Pointer to encoder initialization function */
267    encoder_init_func enc_init;
268 
269    /** Pointer to encoder destruction function */
270    encoder_destroy_func enc_destroy;
271 
272    /** Pointer to frame encoding function */
273    encode_func enc;
274 
275    /** Pointer to decoder initialization function */
276    decoder_init_func dec_init;
277 
278    /** Pointer to decoder destruction function */
279    decoder_destroy_func dec_destroy;
280 
281    /** Pointer to frame decoding function */
282    decode_func dec;
283 
284    /** ioctl-like requests for encoder */
285    encoder_ctl_func enc_ctl;
286 
287    /** ioctl-like requests for decoder */
288    decoder_ctl_func dec_ctl;
289 
290 } SpeexMode;
291 
292 /**
293  * Returns a handle to a newly created Speex encoder state structure. For now,
294  * the "mode" argument can be &nb_mode or &wb_mode . In the future, more modes
295  * may be added. Note that for now if you have more than one channels to
296  * encode, you need one state per channel.
297  *
298  * @param mode The mode to use (either speex_nb_mode or speex_wb.mode)
299  * @return A newly created encoder state or NULL if state allocation fails
300  */
301 void *speex_encoder_init(const SpeexMode *mode);
302 
303 /** Frees all resources associated to an existing Speex encoder state.
304  * @param state Encoder state to be destroyed */
305 void speex_encoder_destroy(void *state);
306 
307 /** Uses an existing encoder state to encode one frame of speech pointed to by
308     "in". The encoded bit-stream is saved in "bits".
309  @param state Encoder state
310  @param in Frame that will be encoded with a +-2^15 range. This data MAY be
311         overwritten by the encoder and should be considered uninitialised
312         after the call.
313  @param bits Bit-stream where the data will be written
314  @return 0 if frame needs not be transmitted (DTX only), 1 otherwise
315  */
316 int speex_encode(void *state, float *in, SpeexBits *bits);
317 
318 /** Uses an existing encoder state to encode one frame of speech pointed to by
319     "in". The encoded bit-stream is saved in "bits".
320  @param state Encoder state
321  @param in Frame that will be encoded with a +-2^15 range
322  @param bits Bit-stream where the data will be written
323  @return 0 if frame needs not be transmitted (DTX only), 1 otherwise
324  */
325 int speex_encode_int(void *state, spx_int16_t *in, SpeexBits *bits);
326 
327 /** Used like the ioctl function to control the encoder parameters
328  *
329  * @param state Encoder state
330  * @param request ioctl-type request (one of the SPEEX_* macros)
331  * @param ptr Data exchanged to-from function
332  * @return 0 if no error, -1 if request in unknown, -2 for invalid parameter
333  */
334 int speex_encoder_ctl(void *state, int request, void *ptr);
335 
336 
337 /** Returns a handle to a newly created decoder state structure. For now,
338  * the mode argument can be &nb_mode or &wb_mode . In the future, more modes
339  * may be added.  Note that for now if you have more than one channels to
340  * decode, you need one state per channel.
341  *
342  * @param mode Speex mode (one of speex_nb_mode or speex_wb_mode)
343  * @return A newly created decoder state or NULL if state allocation fails
344  */
345 void *speex_decoder_init(const SpeexMode *mode);
346 
347 /** Frees all resources associated to an existing decoder state.
348  *
349  * @param state State to be destroyed
350  */
351 void speex_decoder_destroy(void *state);
352 
353 /** Uses an existing decoder state to decode one frame of speech from
354  * bit-stream bits. The output speech is saved written to out.
355  *
356  * @param state Decoder state
357  * @param bits Bit-stream from which to decode the frame (NULL if the packet was lost)
358  * @param out Where to write the decoded frame
359  * @return return status (0 for no error, -1 for end of stream, -2 corrupt stream)
360  */
361 int speex_decode(void *state, SpeexBits *bits, float *out);
362 
363 /** Uses an existing decoder state to decode one frame of speech from
364  * bit-stream bits. The output speech is saved written to out.
365  *
366  * @param state Decoder state
367  * @param bits Bit-stream from which to decode the frame (NULL if the packet was lost)
368  * @param out Where to write the decoded frame
369  * @return return status (0 for no error, -1 for end of stream, -2 corrupt stream)
370  */
371 int speex_decode_int(void *state, SpeexBits *bits, spx_int16_t *out);
372 
373 /** Used like the ioctl function to control the encoder parameters
374  *
375  * @param state Decoder state
376  * @param request ioctl-type request (one of the SPEEX_* macros)
377  * @param ptr Data exchanged to-from function
378  * @return 0 if no error, -1 if request in unknown, -2 for invalid parameter
379  */
380 int speex_decoder_ctl(void *state, int request, void *ptr);
381 
382 
383 /** Query function for mode information
384  *
385  * @param mode Speex mode
386  * @param request ioctl-type request (one of the SPEEX_* macros)
387  * @param ptr Data exchanged to-from function
388  * @return 0 if no error, -1 if request in unknown, -2 for invalid parameter
389  */
390 int speex_mode_query(const SpeexMode *mode, int request, void *ptr);
391 
392 /** Functions for controlling the behavior of libspeex
393  * @param request ioctl-type request (one of the SPEEX_LIB_* macros)
394  * @param ptr Data exchanged to-from function
395  * @return 0 if no error, -1 if request in unknown, -2 for invalid parameter
396  */
397 int speex_lib_ctl(int request, void *ptr);
398 
399 /** Default narrowband mode */
400 extern const SpeexMode speex_nb_mode;
401 
402 /** Default wideband mode */
403 extern const SpeexMode speex_wb_mode;
404 
405 /** Default "ultra-wideband" mode */
406 extern const SpeexMode speex_uwb_mode;
407 
408 /** List of all modes available */
409 extern const SpeexMode * const speex_mode_list[SPEEX_NB_MODES];
410 
411 /** Obtain one of the modes available */
412 const SpeexMode * speex_lib_get_mode (int mode);
413 
414 #ifndef WIN32
415 /* We actually override the function in the narrowband case so that we can avoid linking in the wideband stuff */
416 #define speex_lib_get_mode(mode) ((mode)==SPEEX_MODEID_NB ? &speex_nb_mode : speex_lib_get_mode (mode))
417 #endif
418 
419 #ifdef __cplusplus
420 }
421 #endif
422 
423 /** @}*/
424 #endif
425