1 /* Copyright (C) 2007 Jean-Marc Valin 2 3 File: speex_resampler.h 4 Resampling code 5 6 The design goals of this code are: 7 - Very fast algorithm 8 - Low memory requirement 9 - Good *perceptual* quality (and not best SNR) 10 11 Redistribution and use in source and binary forms, with or without 12 modification, are permitted provided that the following conditions are 13 met: 14 15 1. Redistributions of source code must retain the above copyright notice, 16 this list of conditions and the following disclaimer. 17 18 2. Redistributions in binary form must reproduce the above copyright 19 notice, this list of conditions and the following disclaimer in the 20 documentation and/or other materials provided with the distribution. 21 22 3. The name of the author may not be used to endorse or promote products 23 derived from this software without specific prior written permission. 24 25 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 26 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 27 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 28 DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 29 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 30 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 31 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 33 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 34 ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 39 #ifndef SPEEX_RESAMPLER_H 40 #define SPEEX_RESAMPLER_H 41 42 #ifdef OUTSIDE_SPEEX 43 44 /********* WARNING: MENTAL SANITY ENDS HERE *************/ 45 46 /* If the resampler is defined outside of Speex, we change the symbol names so that 47 there won't be any clash if linking with Speex later on. */ 48 49 /* #define RANDOM_PREFIX your software name here */ 50 #ifndef RANDOM_PREFIX 51 #error "Please define RANDOM_PREFIX (above) to something specific to your project to prevent symbol name clashes" 52 #endif 53 54 #define CAT_PREFIX2(a,b) a ## b 55 #define CAT_PREFIX(a,b) CAT_PREFIX2(a, b) 56 57 #define speex_resampler_init CAT_PREFIX(RANDOM_PREFIX,_resampler_init) 58 #define speex_resampler_init_frac CAT_PREFIX(RANDOM_PREFIX,_resampler_init_frac) 59 #define speex_resampler_destroy CAT_PREFIX(RANDOM_PREFIX,_resampler_destroy) 60 #define speex_resampler_process_float CAT_PREFIX(RANDOM_PREFIX,_resampler_process_float) 61 #define speex_resampler_process_int CAT_PREFIX(RANDOM_PREFIX,_resampler_process_int) 62 #define speex_resampler_process_interleaved_float CAT_PREFIX(RANDOM_PREFIX,_resampler_process_interleaved_float) 63 #define speex_resampler_process_interleaved_int CAT_PREFIX(RANDOM_PREFIX,_resampler_process_interleaved_int) 64 #define speex_resampler_set_rate CAT_PREFIX(RANDOM_PREFIX,_resampler_set_rate) 65 #define speex_resampler_get_rate CAT_PREFIX(RANDOM_PREFIX,_resampler_get_rate) 66 #define speex_resampler_set_rate_frac CAT_PREFIX(RANDOM_PREFIX,_resampler_set_rate_frac) 67 #define speex_resampler_get_ratio CAT_PREFIX(RANDOM_PREFIX,_resampler_get_ratio) 68 #define speex_resampler_set_quality CAT_PREFIX(RANDOM_PREFIX,_resampler_set_quality) 69 #define speex_resampler_get_quality CAT_PREFIX(RANDOM_PREFIX,_resampler_get_quality) 70 #define speex_resampler_set_input_stride CAT_PREFIX(RANDOM_PREFIX,_resampler_set_input_stride) 71 #define speex_resampler_get_input_stride CAT_PREFIX(RANDOM_PREFIX,_resampler_get_input_stride) 72 #define speex_resampler_set_output_stride CAT_PREFIX(RANDOM_PREFIX,_resampler_set_output_stride) 73 #define speex_resampler_get_output_stride CAT_PREFIX(RANDOM_PREFIX,_resampler_get_output_stride) 74 #define speex_resampler_get_input_latency CAT_PREFIX(RANDOM_PREFIX,_resampler_get_input_latency) 75 #define speex_resampler_get_output_latency CAT_PREFIX(RANDOM_PREFIX,_resampler_get_output_latency) 76 #define speex_resampler_skip_zeros CAT_PREFIX(RANDOM_PREFIX,_resampler_skip_zeros) 77 #define speex_resampler_reset_mem CAT_PREFIX(RANDOM_PREFIX,_resampler_reset_mem) 78 #define speex_resampler_strerror CAT_PREFIX(RANDOM_PREFIX,_resampler_strerror) 79 80 #define spx_int16_t short 81 #define spx_int32_t int 82 #define spx_uint16_t unsigned short 83 #define spx_uint32_t unsigned int 84 85 #else /* OUTSIDE_SPEEX */ 86 87 #include "speex/speex_types.h" 88 89 #endif /* OUTSIDE_SPEEX */ 90 91 #ifdef __cplusplus 92 extern "C" { 93 #endif 94 95 #define SPEEX_RESAMPLER_QUALITY_MAX 10 96 #define SPEEX_RESAMPLER_QUALITY_MIN 0 97 #define SPEEX_RESAMPLER_QUALITY_DEFAULT 4 98 #define SPEEX_RESAMPLER_QUALITY_VOIP 3 99 #define SPEEX_RESAMPLER_QUALITY_DESKTOP 5 100 101 enum { 102 RESAMPLER_ERR_SUCCESS = 0, 103 RESAMPLER_ERR_ALLOC_FAILED = 1, 104 RESAMPLER_ERR_BAD_STATE = 2, 105 RESAMPLER_ERR_INVALID_ARG = 3, 106 RESAMPLER_ERR_PTR_OVERLAP = 4, 107 108 RESAMPLER_ERR_MAX_ERROR 109 }; 110 111 struct SpeexResamplerState_; 112 typedef struct SpeexResamplerState_ SpeexResamplerState; 113 114 /** Create a new resampler with integer input and output rates. 115 * @param nb_channels Number of channels to be processed 116 * @param in_rate Input sampling rate (integer number of Hz). 117 * @param out_rate Output sampling rate (integer number of Hz). 118 * @param quality Resampling quality between 0 and 10, where 0 has poor quality 119 * and 10 has very high quality. 120 * @return Newly created resampler state 121 * @retval NULL Error: not enough memory 122 */ 123 SpeexResamplerState *speex_resampler_init(spx_uint32_t nb_channels, 124 spx_uint32_t in_rate, 125 spx_uint32_t out_rate, 126 int quality, 127 int *err); 128 129 /** Create a new resampler with fractional input/output rates. The sampling 130 * rate ratio is an arbitrary rational number with both the numerator and 131 * denominator being 32-bit integers. 132 * @param nb_channels Number of channels to be processed 133 * @param ratio_num Numerator of the sampling rate ratio 134 * @param ratio_den Denominator of the sampling rate ratio 135 * @param in_rate Input sampling rate rounded to the nearest integer (in Hz). 136 * @param out_rate Output sampling rate rounded to the nearest integer (in Hz). 137 * @param quality Resampling quality between 0 and 10, where 0 has poor quality 138 * and 10 has very high quality. 139 * @return Newly created resampler state 140 * @retval NULL Error: not enough memory 141 */ 142 SpeexResamplerState *speex_resampler_init_frac(spx_uint32_t nb_channels, 143 spx_uint32_t ratio_num, 144 spx_uint32_t ratio_den, 145 spx_uint32_t in_rate, 146 spx_uint32_t out_rate, 147 int quality, 148 int *err); 149 150 /** Destroy a resampler state. 151 * @param st Resampler state 152 */ 153 void speex_resampler_destroy(SpeexResamplerState *st); 154 155 /** Resample a float array. The input and output buffers must *not* overlap. 156 * @param st Resampler state 157 * @param channel_index Index of the channel to process for the multi-channel 158 * base (0 otherwise) 159 * @param in Input buffer 160 * @param in_len Number of input samples in the input buffer. Returns the 161 * number of samples processed 162 * @param out Output buffer 163 * @param out_len Size of the output buffer. Returns the number of samples written 164 */ 165 int speex_resampler_process_float(SpeexResamplerState *st, 166 spx_uint32_t channel_index, 167 const float *in, 168 spx_uint32_t *in_len, 169 float *out, 170 spx_uint32_t *out_len); 171 172 /** Resample an int array. The input and output buffers must *not* overlap. 173 * @param st Resampler state 174 * @param channel_index Index of the channel to process for the multi-channel 175 * base (0 otherwise) 176 * @param in Input buffer 177 * @param in_len Number of input samples in the input buffer. Returns the number 178 * of samples processed 179 * @param out Output buffer 180 * @param out_len Size of the output buffer. Returns the number of samples written 181 */ 182 int speex_resampler_process_int(SpeexResamplerState *st, 183 spx_uint32_t channel_index, 184 const spx_int16_t *in, 185 spx_uint32_t *in_len, 186 spx_int16_t *out, 187 spx_uint32_t *out_len); 188 189 /** Resample an interleaved float array. The input and output buffers must *not* overlap. 190 * @param st Resampler state 191 * @param in Input buffer 192 * @param in_len Number of input samples in the input buffer. Returns the number 193 * of samples processed. This is all per-channel. 194 * @param out Output buffer 195 * @param out_len Size of the output buffer. Returns the number of samples written. 196 * This is all per-channel. 197 */ 198 int speex_resampler_process_interleaved_float(SpeexResamplerState *st, 199 const float *in, 200 spx_uint32_t *in_len, 201 float *out, 202 spx_uint32_t *out_len); 203 204 /** Resample an interleaved int array. The input and output buffers must *not* overlap. 205 * @param st Resampler state 206 * @param in Input buffer 207 * @param in_len Number of input samples in the input buffer. Returns the number 208 * of samples processed. This is all per-channel. 209 * @param out Output buffer 210 * @param out_len Size of the output buffer. Returns the number of samples written. 211 * This is all per-channel. 212 */ 213 int speex_resampler_process_interleaved_int(SpeexResamplerState *st, 214 const spx_int16_t *in, 215 spx_uint32_t *in_len, 216 spx_int16_t *out, 217 spx_uint32_t *out_len); 218 219 /** Set (change) the input/output sampling rates (integer value). 220 * @param st Resampler state 221 * @param in_rate Input sampling rate (integer number of Hz). 222 * @param out_rate Output sampling rate (integer number of Hz). 223 */ 224 int speex_resampler_set_rate(SpeexResamplerState *st, 225 spx_uint32_t in_rate, 226 spx_uint32_t out_rate); 227 228 /** Get the current input/output sampling rates (integer value). 229 * @param st Resampler state 230 * @param in_rate Input sampling rate (integer number of Hz) copied. 231 * @param out_rate Output sampling rate (integer number of Hz) copied. 232 */ 233 void speex_resampler_get_rate(SpeexResamplerState *st, 234 spx_uint32_t *in_rate, 235 spx_uint32_t *out_rate); 236 237 /** Set (change) the input/output sampling rates and resampling ratio 238 * (fractional values in Hz supported). 239 * @param st Resampler state 240 * @param ratio_num Numerator of the sampling rate ratio 241 * @param ratio_den Denominator of the sampling rate ratio 242 * @param in_rate Input sampling rate rounded to the nearest integer (in Hz). 243 * @param out_rate Output sampling rate rounded to the nearest integer (in Hz). 244 */ 245 int speex_resampler_set_rate_frac(SpeexResamplerState *st, 246 spx_uint32_t ratio_num, 247 spx_uint32_t ratio_den, 248 spx_uint32_t in_rate, 249 spx_uint32_t out_rate); 250 251 /** Get the current resampling ratio. This will be reduced to the least 252 * common denominator. 253 * @param st Resampler state 254 * @param ratio_num Numerator of the sampling rate ratio copied 255 * @param ratio_den Denominator of the sampling rate ratio copied 256 */ 257 void speex_resampler_get_ratio(SpeexResamplerState *st, 258 spx_uint32_t *ratio_num, 259 spx_uint32_t *ratio_den); 260 261 /** Set (change) the conversion quality. 262 * @param st Resampler state 263 * @param quality Resampling quality between 0 and 10, where 0 has poor 264 * quality and 10 has very high quality. 265 */ 266 int speex_resampler_set_quality(SpeexResamplerState *st, 267 int quality); 268 269 /** Get the conversion quality. 270 * @param st Resampler state 271 * @param quality Resampling quality between 0 and 10, where 0 has poor 272 * quality and 10 has very high quality. 273 */ 274 void speex_resampler_get_quality(SpeexResamplerState *st, 275 int *quality); 276 277 /** Set (change) the input stride. 278 * @param st Resampler state 279 * @param stride Input stride 280 */ 281 void speex_resampler_set_input_stride(SpeexResamplerState *st, 282 spx_uint32_t stride); 283 284 /** Get the input stride. 285 * @param st Resampler state 286 * @param stride Input stride copied 287 */ 288 void speex_resampler_get_input_stride(SpeexResamplerState *st, 289 spx_uint32_t *stride); 290 291 /** Set (change) the output stride. 292 * @param st Resampler state 293 * @param stride Output stride 294 */ 295 void speex_resampler_set_output_stride(SpeexResamplerState *st, 296 spx_uint32_t stride); 297 298 /** Get the output stride. 299 * @param st Resampler state copied 300 * @param stride Output stride 301 */ 302 void speex_resampler_get_output_stride(SpeexResamplerState *st, 303 spx_uint32_t *stride); 304 305 /** Get the latency in input samples introduced by the resampler. 306 * @param st Resampler state 307 */ 308 int speex_resampler_get_input_latency(SpeexResamplerState *st); 309 310 /** Get the latency in output samples introduced by the resampler. 311 * @param st Resampler state 312 */ 313 int speex_resampler_get_output_latency(SpeexResamplerState *st); 314 315 /** Make sure that the first samples to go out of the resamplers don't have 316 * leading zeros. This is only useful before starting to use a newly created 317 * resampler. It is recommended to use that when resampling an audio file, as 318 * it will generate a file with the same length. For real-time processing, 319 * it is probably easier not to use this call (so that the output duration 320 * is the same for the first frame). 321 * @param st Resampler state 322 */ 323 int speex_resampler_skip_zeros(SpeexResamplerState *st); 324 325 /** Reset a resampler so a new (unrelated) stream can be processed. 326 * @param st Resampler state 327 */ 328 int speex_resampler_reset_mem(SpeexResamplerState *st); 329 330 /** Returns the English meaning for an error code 331 * @param err Error code 332 * @return English string 333 */ 334 const char *speex_resampler_strerror(int err); 335 336 #ifdef __cplusplus 337 } 338 #endif 339 340 #endif 341
