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
