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 */
6 Redistribution and use in source and binary forms, with or without
7 modification, are permitted provided that the following conditions
10 - Redistributions of source code must retain the above copyright
11 notice, this list of conditions and the following disclaimer.
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.
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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,
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32 @brief Opus-Custom reference implementation API
38 #include "opus_defines.h"
45 #define OPUS_CUSTOM_EXPORT OPUS_EXPORT
46 #define OPUS_CUSTOM_EXPORT_STATIC OPUS_EXPORT
48 #define OPUS_CUSTOM_EXPORT
50 #define OPUS_CUSTOM_EXPORT_STATIC static inline
52 #define OPUS_CUSTOM_EXPORT_STATIC
56 /** @defgroup opus_custom Opus Custom
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
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.
75 * Libopus only supports custom modes if they are enabled at compile time.
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.
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.
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.
95 typedef struct OpusCustomEncoder OpusCustomEncoder;
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.
102 typedef struct OpusCustomDecoder OpusCustomDecoder;
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
108 @brief Mode configuration
110 typedef struct OpusCustomMode OpusCustomMode;
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
121 OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT OpusCustomMode *opus_custom_mode_create(opus_int32 Fs, int frame_size, int *error);
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.
127 OPUS_CUSTOM_EXPORT void opus_custom_mode_destroy(OpusCustomMode *mode);
130 /** Gets the size of an OpusCustomEncoder structure.
131 * @param [in] mode <tt>OpusCustomMode *</tt>: Mode configuration
132 * @param [in] channels <tt>int</tt>: Number of channels
135 OPUS_CUSTOM_EXPORT_STATIC OPUS_WARN_UNUSED_RESULT int opus_custom_encoder_get_size(
136 const OpusCustomMode *mode,
138 ) OPUS_ARG_NONNULL(1);
140 /** Creates a new encoder state. Each stream needs its own encoder
141 * state (can't be shared across simultaneous streams).
142 * @param [in] mode <tt>OpusCustomMode*</tt>: Contains all the information about the characteristics of
143 * the stream (must be the same characteristics as used for the
145 * @param [in] channels <tt>int</tt>: Number of channels
146 * @param [out] error <tt>int*</tt>: Returns an error code
147 * @return Newly created encoder state.
149 OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT OpusCustomEncoder *opus_custom_encoder_create(
150 const OpusCustomMode *mode,
153 ) OPUS_ARG_NONNULL(1);
155 /** Initializes a previously allocated encoder state
156 * The memory pointed to by st must be the size returned by opus_custom_encoder_get_size.
157 * This is intended for applications which use their own allocator instead of malloc.
158 * @see opus_custom_encoder_create(),opus_custom_encoder_get_size()
159 * To reset a previously initialized state use the OPUS_RESET_STATE CTL.
160 * @param [in] st <tt>OpusCustomEncoder*</tt>: Encoder state
161 * @param [in] mode <tt>OpusCustomMode *</tt>: Contains all the information about the characteristics of
162 * the stream (must be the same characteristics as used for the
164 * @param [in] channels <tt>int</tt>: Number of channels
165 * @return OPUS_OK Success or @ref opus_errorcodes
167 OPUS_CUSTOM_EXPORT_STATIC int opus_custom_encoder_init(
168 OpusCustomEncoder *st,
169 const OpusCustomMode *mode,
171 ) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2);
173 /** Destroys a an encoder state.
174 * @param[in] st <tt>OpusCustomEncoder*</tt>: State to be freed.
176 OPUS_CUSTOM_EXPORT void opus_custom_encoder_destroy(OpusCustomEncoder *st);
178 /** Encodes a frame of audio.
179 * @param [in] st <tt>OpusCustomEncoder*</tt>: Encoder state
180 * @param [in] pcm <tt>float*</tt>: PCM audio in float format, with a normal range of +/-1.0.
181 * Samples with a range beyond +/-1.0 are supported but will
182 * be clipped by decoders using the integer API and should
183 * only be used if it is known that the far end supports
184 * extended dynamic range. There must be exactly
185 * frame_size samples per channel.
186 * @param [in] frame_size <tt>int</tt>: Number of samples per frame of input signal
187 * @param [out] compressed <tt>char *</tt>: The compressed data is written here. This may not alias pcm and must be at least maxCompressedBytes long.
188 * @param [in] maxCompressedBytes <tt>int</tt>: Maximum number of bytes to use for compressing the frame
189 * (can change from one frame to another)
190 * @return Number of bytes written to "compressed".
191 * If negative, an error has occurred (see error codes). It is IMPORTANT that
192 * the length returned be somehow transmitted to the decoder. Otherwise, no
193 * decoding is possible.
195 OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT int opus_custom_encode_float(
196 OpusCustomEncoder *st,
199 unsigned char *compressed,
200 int maxCompressedBytes
201 ) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2) OPUS_ARG_NONNULL(4);
203 /** Encodes a frame of audio.
204 * @param [in] st <tt>OpusCustomEncoder*</tt>: Encoder state
205 * @param [in] pcm <tt>opus_int16*</tt>: PCM audio in signed 16-bit format (native endian).
206 * There must be exactly frame_size samples per channel.
207 * @param [in] frame_size <tt>int</tt>: Number of samples per frame of input signal
208 * @param [out] compressed <tt>char *</tt>: The compressed data is written here. This may not alias pcm and must be at least maxCompressedBytes long.
209 * @param [in] maxCompressedBytes <tt>int</tt>: Maximum number of bytes to use for compressing the frame
210 * (can change from one frame to another)
211 * @return Number of bytes written to "compressed".
212 * If negative, an error has occurred (see error codes). It is IMPORTANT that
213 * the length returned be somehow transmitted to the decoder. Otherwise, no
214 * decoding is possible.
216 OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT int opus_custom_encode(
217 OpusCustomEncoder *st,
218 const opus_int16 *pcm,
220 unsigned char *compressed,
221 int maxCompressedBytes
222 ) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2) OPUS_ARG_NONNULL(4);
224 /** Perform a CTL function on an Opus custom encoder.
226 * Generally the request and subsequent arguments are generated
227 * by a convenience macro.
228 * @see opus_encoderctls
230 OPUS_CUSTOM_EXPORT int opus_custom_encoder_ctl(OpusCustomEncoder * restrict st, int request, ...) OPUS_ARG_NONNULL(1);
234 /** Gets the size of an OpusCustomDecoder structure.
235 * @param [in] mode <tt>OpusCustomMode *</tt>: Mode configuration
236 * @param [in] channels <tt>int</tt>: Number of channels
239 OPUS_CUSTOM_EXPORT_STATIC OPUS_WARN_UNUSED_RESULT int opus_custom_decoder_get_size(
240 const OpusCustomMode *mode,
242 ) OPUS_ARG_NONNULL(1);
244 /** Creates a new decoder state. Each stream needs its own decoder state (can't
245 * be shared across simultaneous streams).
246 * @param [in] mode <tt>OpusCustomMode</tt>: Contains all the information about the characteristics of the
247 * stream (must be the same characteristics as used for the encoder)
248 * @param [in] channels <tt>int</tt>: Number of channels
249 * @param [out] error <tt>int*</tt>: Returns an error code
250 * @return Newly created decoder state.
252 OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT OpusCustomDecoder *opus_custom_decoder_create(
253 const OpusCustomMode *mode,
256 ) OPUS_ARG_NONNULL(1);
258 /** Initializes a previously allocated decoder state
259 * The memory pointed to by st must be the size returned by opus_custom_decoder_get_size.
260 * This is intended for applications which use their own allocator instead of malloc.
261 * @see opus_custom_decoder_create(),opus_custom_decoder_get_size()
262 * To reset a previously initialized state use the OPUS_RESET_STATE CTL.
263 * @param [in] st <tt>OpusCustomDecoder*</tt>: Decoder state
264 * @param [in] mode <tt>OpusCustomMode *</tt>: Contains all the information about the characteristics of
265 * the stream (must be the same characteristics as used for the
267 * @param [in] channels <tt>int</tt>: Number of channels
268 * @return OPUS_OK Success or @ref opus_errorcodes
270 OPUS_CUSTOM_EXPORT_STATIC int opus_custom_decoder_init(
271 OpusCustomDecoder *st,
272 const OpusCustomMode *mode,
274 ) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2);
276 /** Destroys a an decoder state.
277 * @param[in] st <tt>OpusCustomDecoder*</tt>: State to be freed.
279 OPUS_CUSTOM_EXPORT void opus_custom_decoder_destroy(OpusCustomDecoder *st);
281 /** Decode an opus custom frame with floating point output
282 * @param [in] st <tt>OpusCustomDecoder*</tt>: Decoder state
283 * @param [in] data <tt>char*</tt>: Input payload. Use a NULL pointer to indicate packet loss
284 * @param [in] len <tt>int</tt>: Number of bytes in payload
285 * @param [out] pcm <tt>float*</tt>: Output signal (interleaved if 2 channels). length
286 * is frame_size*channels*sizeof(float)
287 * @param [in] frame_size Number of samples per channel of available space in *pcm.
288 * @returns Number of decoded samples or @ref opus_errorcodes
290 OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT int opus_custom_decode_float(
291 OpusCustomDecoder *st,
292 const unsigned char *data,
296 ) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(4);
298 /** Decode an opus custom frame
299 * @param [in] st <tt>OpusCustomDecoder*</tt>: Decoder state
300 * @param [in] data <tt>char*</tt>: Input payload. Use a NULL pointer to indicate packet loss
301 * @param [in] len <tt>int</tt>: Number of bytes in payload
302 * @param [out] pcm <tt>opus_int16*</tt>: Output signal (interleaved if 2 channels). length
303 * is frame_size*channels*sizeof(opus_int16)
304 * @param [in] frame_size Number of samples per channel of available space in *pcm.
305 * @returns Number of decoded samples or @ref opus_errorcodes
307 OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT int opus_custom_decode(
308 OpusCustomDecoder *st,
309 const unsigned char *data,
313 ) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(4);
315 /** Perform a CTL function on an Opus custom decoder.
317 * Generally the request and subsequent arguments are generated
318 * by a convenience macro.
319 * @see opus_genericctls
321 OPUS_CUSTOM_EXPORT int opus_custom_decoder_ctl(OpusCustomDecoder * restrict st, int request, ...) OPUS_ARG_NONNULL(1);
329 #endif /* OPUS_CUSTOM_H */