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| 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 t
hat |
| 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 projec
t 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_proces
s_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,_resa
mpler_process_interleaved_float) |
| 63 #define speex_resampler_process_interleaved_int CAT_PREFIX(RANDOM_PREFIX,_resamp
ler_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_ra
te_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_qual
ity) |
| 69 #define speex_resampler_get_quality CAT_PREFIX(RANDOM_PREFIX,_resampler_get_qual
ity) |
| 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_se
t_output_stride) |
| 73 #define speex_resampler_get_output_stride CAT_PREFIX(RANDOM_PREFIX,_resampler_ge
t_output_stride) |
| 74 #define speex_resampler_get_input_latency CAT_PREFIX(RANDOM_PREFIX,_resampler_ge
t_input_latency) |
| 75 #define speex_resampler_get_output_latency CAT_PREFIX(RANDOM_PREFIX,_resampler_g
et_output_latency) |
| 76 #define speex_resampler_skip_zeros CAT_PREFIX(RANDOM_PREFIX,_resampler_skip_zero
s) |
| 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 writt
en |
| 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 writt
en |
| 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 writt
en. |
| 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* o
verlap. |
| 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 writt
en. |
| 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 |
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