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1 /* Copyright (c) 2007-2008 CSIRO
2    Copyright (c) 2007-2009 Xiph.Org Foundation
3    Copyright (c) 2008-2012 Gregory Maxwell
4    Written by Jean-Marc Valin and Gregory Maxwell */
5 /*
6    Redistribution and use in source and binary forms, with or without
7    modification, are permitted provided that the following conditions
8    are met:
9 
10    - Redistributions of source code must retain the above copyright
11    notice, this list of conditions and the following disclaimer.
12 
13    - Redistributions in binary form must reproduce the above copyright
14    notice, this list of conditions and the following disclaimer in the
15    documentation and/or other materials provided with the distribution.
16 
17    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
21    OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
24    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
25    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
26    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
27    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29 
30 /**
31   @file opus_custom.h
32   @brief Opus-Custom reference implementation API
33  */
34 
35 #ifndef OPUS_CUSTOM_H
36 #define OPUS_CUSTOM_H
37 
38 #include "opus_defines.h"
39 
40 #ifdef __cplusplus
41 extern "C" {
42 #endif
43 
44 #ifdef CUSTOM_MODES
45 # define OPUS_CUSTOM_EXPORT OPUS_EXPORT
46 # define OPUS_CUSTOM_EXPORT_STATIC OPUS_EXPORT
47 #else
48 # define OPUS_CUSTOM_EXPORT
49 # ifdef OPUS_BUILD
50 #  define OPUS_CUSTOM_EXPORT_STATIC static OPUS_INLINE
51 # else
52 #  define OPUS_CUSTOM_EXPORT_STATIC
53 # endif
54 #endif
55 
56 /** @defgroup opus_custom Opus Custom
57   * @{
58   *  Opus Custom is an optional part of the Opus specification and
59   * reference implementation which uses a distinct API from the regular
60   * API and supports frame sizes that are not normally supported.\ Use
61   * of Opus Custom is discouraged for all but very special applications
62   * for which a frame size different from 2.5, 5, 10, or 20 ms is needed
63   * (for either complexity or latency reasons) and where interoperability
64   * is less important.
65   *
66   * In addition to the interoperability limitations the use of Opus custom
67   * disables a substantial chunk of the codec and generally lowers the
68   * quality available at a given bitrate. Normally when an application needs
69   * a different frame size from the codec it should buffer to match the
70   * sizes but this adds a small amount of delay which may be important
71   * in some very low latency applications. Some transports (especially
72   * constant rate RF transports) may also work best with frames of
73   * particular durations.
74   *
75   * Libopus only supports custom modes if they are enabled at compile time.
76   *
77   * The Opus Custom API is similar to the regular API but the
78   * @ref opus_encoder_create and @ref opus_decoder_create calls take
79   * an additional mode parameter which is a structure produced by
80   * a call to @ref opus_custom_mode_create. Both the encoder and decoder
81   * must create a mode using the same sample rate (fs) and frame size
82   * (frame size) so these parameters must either be signaled out of band
83   * or fixed in a particular implementation.
84   *
85   * Similar to regular Opus the custom modes support on the fly frame size
86   * switching, but the sizes available depend on the particular frame size in
87   * use. For some initial frame sizes on a single on the fly size is available.
88   */
89 
90 /** Contains the state of an encoder. One encoder state is needed
91     for each stream. It is initialized once at the beginning of the
92     stream. Do *not* re-initialize the state for every frame.
93    @brief Encoder state
94  */
95 typedef struct OpusCustomEncoder OpusCustomEncoder;
96 
97 /** State of the decoder. One decoder state is needed for each stream.
98     It is initialized once at the beginning of the stream. Do *not*
99     re-initialize the state for every frame.
100    @brief Decoder state
101  */
102 typedef struct OpusCustomDecoder OpusCustomDecoder;
103 
104 /** The mode contains all the information necessary to create an
105     encoder. Both the encoder and decoder need to be initialized
106     with exactly the same mode, otherwise the output will be
107     corrupted.
108    @brief Mode configuration
109  */
110 typedef struct OpusCustomMode OpusCustomMode;
111 
112 /** Creates a new mode struct. This will be passed to an encoder or
113   * decoder. The mode MUST NOT BE DESTROYED until the encoders and
114   * decoders that use it are destroyed as well.
115   * @param [in] Fs <tt>int</tt>: Sampling rate (8000 to 96000 Hz)
116   * @param [in] frame_size <tt>int</tt>: Number of samples (per channel) to encode in each
117   *        packet (64 - 1024, prime factorization must contain zero or more 2s, 3s, or 5s and no other primes)
118   * @param [out] error <tt>int*</tt>: Returned error code (if NULL, no error will be returned)
119   * @return A newly created mode
120   */
121 OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT OpusCustomMode *opus_custom_mode_create(opus_int32 Fs, int frame_size, int *error);
122 
123 /** Destroys a mode struct. Only call this after all encoders and
124   * decoders using this mode are destroyed as well.
125   * @param [in] mode <tt>OpusCustomMode*</tt>: Mode to be freed.
126   */
127 OPUS_CUSTOM_EXPORT void opus_custom_mode_destroy(OpusCustomMode *mode);
128 
129 
130 #if !defined(OPUS_BUILD) || defined(CELT_ENCODER_C)
131 
132 /* Encoder */
133 /** Gets the size of an OpusCustomEncoder structure.
134   * @param [in] mode <tt>OpusCustomMode *</tt>: Mode configuration
135   * @param [in] channels <tt>int</tt>: Number of channels
136   * @returns size
137   */
138 OPUS_CUSTOM_EXPORT_STATIC OPUS_WARN_UNUSED_RESULT int opus_custom_encoder_get_size(
139     const OpusCustomMode *mode,
140     int channels
141 ) OPUS_ARG_NONNULL(1);
142 
143 # ifdef CUSTOM_MODES
144 /** Initializes a previously allocated encoder state
145   * The memory pointed to by st must be the size returned by opus_custom_encoder_get_size.
146   * This is intended for applications which use their own allocator instead of malloc.
147   * @see opus_custom_encoder_create(),opus_custom_encoder_get_size()
148   * To reset a previously initialized state use the OPUS_RESET_STATE CTL.
149   * @param [in] st <tt>OpusCustomEncoder*</tt>: Encoder state
150   * @param [in] mode <tt>OpusCustomMode *</tt>: Contains all the information about the characteristics of
151   *  the stream (must be the same characteristics as used for the
152   *  decoder)
153   * @param [in] channels <tt>int</tt>: Number of channels
154   * @return OPUS_OK Success or @ref opus_errorcodes
155   */
156 OPUS_CUSTOM_EXPORT int opus_custom_encoder_init(
157     OpusCustomEncoder *st,
158     const OpusCustomMode *mode,
159     int channels
160 ) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2);
161 # endif
162 #endif
163 
164 
165 /** Creates a new encoder state. Each stream needs its own encoder
166   * state (can't be shared across simultaneous streams).
167   * @param [in] mode <tt>OpusCustomMode*</tt>: Contains all the information about the characteristics of
168   *  the stream (must be the same characteristics as used for the
169   *  decoder)
170   * @param [in] channels <tt>int</tt>: Number of channels
171   * @param [out] error <tt>int*</tt>: Returns an error code
172   * @return Newly created encoder state.
173 */
174 OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT OpusCustomEncoder *opus_custom_encoder_create(
175     const OpusCustomMode *mode,
176     int channels,
177     int *error
178 ) OPUS_ARG_NONNULL(1);
179 
180 
181 /** Destroys a an encoder state.
182   * @param[in] st <tt>OpusCustomEncoder*</tt>: State to be freed.
183   */
184 OPUS_CUSTOM_EXPORT void opus_custom_encoder_destroy(OpusCustomEncoder *st);
185 
186 /** Encodes a frame of audio.
187   * @param [in] st <tt>OpusCustomEncoder*</tt>: Encoder state
188   * @param [in] pcm <tt>float*</tt>: PCM audio in float format, with a normal range of +/-1.0.
189   *          Samples with a range beyond +/-1.0 are supported but will
190   *          be clipped by decoders using the integer API and should
191   *          only be used if it is known that the far end supports
192   *          extended dynamic range. There must be exactly
193   *          frame_size samples per channel.
194   * @param [in] frame_size <tt>int</tt>: Number of samples per frame of input signal
195   * @param [out] compressed <tt>char *</tt>: The compressed data is written here. This may not alias pcm and must be at least maxCompressedBytes long.
196   * @param [in] maxCompressedBytes <tt>int</tt>: Maximum number of bytes to use for compressing the frame
197   *          (can change from one frame to another)
198   * @return Number of bytes written to "compressed".
199   *       If negative, an error has occurred (see error codes). It is IMPORTANT that
200   *       the length returned be somehow transmitted to the decoder. Otherwise, no
201   *       decoding is possible.
202   */
203 OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT int opus_custom_encode_float(
204     OpusCustomEncoder *st,
205     const float *pcm,
206     int frame_size,
207     unsigned char *compressed,
208     int maxCompressedBytes
209 ) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2) OPUS_ARG_NONNULL(4);
210 
211 /** Encodes a frame of audio.
212   * @param [in] st <tt>OpusCustomEncoder*</tt>: Encoder state
213   * @param [in] pcm <tt>opus_int16*</tt>: PCM audio in signed 16-bit format (native endian).
214   *          There must be exactly frame_size samples per channel.
215   * @param [in] frame_size <tt>int</tt>: Number of samples per frame of input signal
216   * @param [out] compressed <tt>char *</tt>: The compressed data is written here. This may not alias pcm and must be at least maxCompressedBytes long.
217   * @param [in] maxCompressedBytes <tt>int</tt>: Maximum number of bytes to use for compressing the frame
218   *          (can change from one frame to another)
219   * @return Number of bytes written to "compressed".
220   *       If negative, an error has occurred (see error codes). It is IMPORTANT that
221   *       the length returned be somehow transmitted to the decoder. Otherwise, no
222   *       decoding is possible.
223  */
224 OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT int opus_custom_encode(
225     OpusCustomEncoder *st,
226     const opus_int16 *pcm,
227     int frame_size,
228     unsigned char *compressed,
229     int maxCompressedBytes
230 ) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2) OPUS_ARG_NONNULL(4);
231 
232 /** Perform a CTL function on an Opus custom encoder.
233   *
234   * Generally the request and subsequent arguments are generated
235   * by a convenience macro.
236   * @see opus_encoderctls
237   */
238 OPUS_CUSTOM_EXPORT int opus_custom_encoder_ctl(OpusCustomEncoder * OPUS_RESTRICT st, int request, ...) OPUS_ARG_NONNULL(1);
239 
240 
241 #if !defined(OPUS_BUILD) || defined(CELT_DECODER_C)
242 /* Decoder */
243 
244 /** Gets the size of an OpusCustomDecoder structure.
245   * @param [in] mode <tt>OpusCustomMode *</tt>: Mode configuration
246   * @param [in] channels <tt>int</tt>: Number of channels
247   * @returns size
248   */
249 OPUS_CUSTOM_EXPORT_STATIC OPUS_WARN_UNUSED_RESULT int opus_custom_decoder_get_size(
250     const OpusCustomMode *mode,
251     int channels
252 ) OPUS_ARG_NONNULL(1);
253 
254 /** Initializes a previously allocated decoder state
255   * The memory pointed to by st must be the size returned by opus_custom_decoder_get_size.
256   * This is intended for applications which use their own allocator instead of malloc.
257   * @see opus_custom_decoder_create(),opus_custom_decoder_get_size()
258   * To reset a previously initialized state use the OPUS_RESET_STATE CTL.
259   * @param [in] st <tt>OpusCustomDecoder*</tt>: Decoder state
260   * @param [in] mode <tt>OpusCustomMode *</tt>: Contains all the information about the characteristics of
261   *  the stream (must be the same characteristics as used for the
262   *  encoder)
263   * @param [in] channels <tt>int</tt>: Number of channels
264   * @return OPUS_OK Success or @ref opus_errorcodes
265   */
266 OPUS_CUSTOM_EXPORT_STATIC int opus_custom_decoder_init(
267     OpusCustomDecoder *st,
268     const OpusCustomMode *mode,
269     int channels
270 ) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2);
271 
272 #endif
273 
274 
275 /** Creates a new decoder state. Each stream needs its own decoder state (can't
276   * be shared across simultaneous streams).
277   * @param [in] mode <tt>OpusCustomMode</tt>: Contains all the information about the characteristics of the
278   *          stream (must be the same characteristics as used for the encoder)
279   * @param [in] channels <tt>int</tt>: Number of channels
280   * @param [out] error <tt>int*</tt>: Returns an error code
281   * @return Newly created decoder state.
282   */
283 OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT OpusCustomDecoder *opus_custom_decoder_create(
284     const OpusCustomMode *mode,
285     int channels,
286     int *error
287 ) OPUS_ARG_NONNULL(1);
288 
289 /** Destroys a an decoder state.
290   * @param[in] st <tt>OpusCustomDecoder*</tt>: State to be freed.
291   */
292 OPUS_CUSTOM_EXPORT void opus_custom_decoder_destroy(OpusCustomDecoder *st);
293 
294 /** Decode an opus custom frame with floating point output
295   * @param [in] st <tt>OpusCustomDecoder*</tt>: Decoder state
296   * @param [in] data <tt>char*</tt>: Input payload. Use a NULL pointer to indicate packet loss
297   * @param [in] len <tt>int</tt>: Number of bytes in payload
298   * @param [out] pcm <tt>float*</tt>: Output signal (interleaved if 2 channels). length
299   *  is frame_size*channels*sizeof(float)
300   * @param [in] frame_size Number of samples per channel of available space in *pcm.
301   * @returns Number of decoded samples or @ref opus_errorcodes
302   */
303 OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT int opus_custom_decode_float(
304     OpusCustomDecoder *st,
305     const unsigned char *data,
306     int len,
307     float *pcm,
308     int frame_size
309 ) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(4);
310 
311 /** Decode an opus custom frame
312   * @param [in] st <tt>OpusCustomDecoder*</tt>: Decoder state
313   * @param [in] data <tt>char*</tt>: Input payload. Use a NULL pointer to indicate packet loss
314   * @param [in] len <tt>int</tt>: Number of bytes in payload
315   * @param [out] pcm <tt>opus_int16*</tt>: Output signal (interleaved if 2 channels). length
316   *  is frame_size*channels*sizeof(opus_int16)
317   * @param [in] frame_size Number of samples per channel of available space in *pcm.
318   * @returns Number of decoded samples or @ref opus_errorcodes
319   */
320 OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT int opus_custom_decode(
321     OpusCustomDecoder *st,
322     const unsigned char *data,
323     int len,
324     opus_int16 *pcm,
325     int frame_size
326 ) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(4);
327 
328 /** Perform a CTL function on an Opus custom decoder.
329   *
330   * Generally the request and subsequent arguments are generated
331   * by a convenience macro.
332   * @see opus_genericctls
333   */
334 OPUS_CUSTOM_EXPORT int opus_custom_decoder_ctl(OpusCustomDecoder * OPUS_RESTRICT st, int request, ...) OPUS_ARG_NONNULL(1);
335 
336 /**@}*/
337 
338 #ifdef __cplusplus
339 }
340 #endif
341 
342 #endif /* OPUS_CUSTOM_H */
343