1 /* Copyright (C) 2007 Jean-Marc Valin
3 File: speex_resampler.h
6 The design goals of this code are:
8 - Low memory requirement
9 - Good *perceptual* quality (and not best SNR)
11 Redistribution and use in source and binary forms, with or without
12 modification, are permitted provided that the following conditions are
15 1. Redistributions of source code must retain the above copyright notice,
16 this list of conditions and the following disclaimer.
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.
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.
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.
39 #ifndef SPEEX_RESAMPLER_H
40 #define SPEEX_RESAMPLER_H
44 /********* WARNING: MENTAL SANITY ENDS HERE *************/
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. */
49 /* #define RANDOM_PREFIX your software name here */
51 #error "Please define RANDOM_PREFIX (above) to something specific to your project to prevent symbol name clashes"
54 #define CAT_PREFIX2(a,b) a ## b
55 #define CAT_PREFIX(a,b) CAT_PREFIX2(a, b)
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_get_filt_len CAT_PREFIX(RANDOM_PREFIX,_resampler_get_filt_len)
77 #define speex_resampler_get_sinc_filter_mode CAT_PREFIX(RANDOM_PREFIX,_resampler_get_sinc_filter_mode)
78 #define speex_resampler_skip_zeros CAT_PREFIX(RANDOM_PREFIX,_resampler_skip_zeros)
79 #define speex_resampler_reset_mem CAT_PREFIX(RANDOM_PREFIX,_resampler_reset_mem)
80 #define speex_resampler_strerror CAT_PREFIX(RANDOM_PREFIX,_resampler_strerror)
82 #define spx_int16_t gint16
83 #define spx_int32_t gint32
84 #define spx_uint16_t guint16
85 #define spx_uint32_t guint32
87 #else /* OUTSIDE_SPEEX */
90 # include "speex_types.h"
92 # include <speex/speex_types.h>
95 #endif /* OUTSIDE_SPEEX */
101 #define SPEEX_RESAMPLER_QUALITY_MAX 10
102 #define SPEEX_RESAMPLER_QUALITY_MIN 0
103 #define SPEEX_RESAMPLER_QUALITY_DEFAULT 4
104 #define SPEEX_RESAMPLER_QUALITY_VOIP 3
105 #define SPEEX_RESAMPLER_QUALITY_DESKTOP 5
108 RESAMPLER_ERR_SUCCESS = 0,
109 RESAMPLER_ERR_ALLOC_FAILED = 1,
110 RESAMPLER_ERR_BAD_STATE = 2,
111 RESAMPLER_ERR_INVALID_ARG = 3,
112 RESAMPLER_ERR_PTR_OVERLAP = 4,
114 RESAMPLER_ERR_MAX_ERROR
118 RESAMPLER_SINC_FILTER_INTERPOLATED = 0,
119 RESAMPLER_SINC_FILTER_FULL = 1,
120 RESAMPLER_SINC_FILTER_AUTO = 2
121 } SpeexResamplerSincFilterMode;
123 #define RESAMPLER_SINC_FILTER_DEFAULT RESAMPLER_SINC_FILTER_INTERPOLATED
124 #define RESAMPLER_SINC_FILTER_AUTO_THRESHOLD_DEFAULT (1 * 1048576)
126 struct SpeexResamplerState_;
127 typedef struct SpeexResamplerState_ SpeexResamplerState;
129 /** Create a new resampler with integer input and output rates.
130 * @param nb_channels Number of channels to be processed
131 * @param in_rate Input sampling rate (integer number of Hz).
132 * @param out_rate Output sampling rate (integer number of Hz).
133 * @param quality Resampling quality between 0 and 10, where 0 has poor quality
134 * and 10 has very high quality.
135 * @param sinc_filter_mode Sinc filter table mode to use
136 * @param sinc_filter_auto_threshold Threshold to use if sinc filter mode is auto, in bytes
137 * @return Newly created resampler state
138 * @retval NULL Error: not enough memory
140 * If a full filter table would be larger than the auto threshold, and sinc_filter_mode is AUTO,
141 * the resample uses the interpolated mode instead
143 * @note A full sinc table can significantly improve the resampler's performance, but calculating the table
144 * takes longer, as opposed to the interpolated variant
146 SpeexResamplerState *speex_resampler_init(spx_uint32_t nb_channels,
147 spx_uint32_t in_rate,
148 spx_uint32_t out_rate,
150 SpeexResamplerSincFilterMode sinc_filter_mode,
151 spx_uint32_t sinc_filter_auto_threshold,
154 /** Create a new resampler with fractional input/output rates. The sampling
155 * rate ratio is an arbitrary rational number with both the numerator and
156 * denominator being 32-bit integers.
157 * @param nb_channels Number of channels to be processed
158 * @param ratio_num Numerator of the sampling rate ratio
159 * @param ratio_den Denominator of the sampling rate ratio
160 * @param in_rate Input sampling rate rounded to the nearest integer (in Hz).
161 * @param out_rate Output sampling rate rounded to the nearest integer (in Hz).
162 * @param quality Resampling quality between 0 and 10, where 0 has poor quality
163 * and 10 has very high quality.
164 * @param sinc_filter_mode Sinc filter table mode to use
165 * @param sinc_filter_auto_threshold Threshold to use if sinc filter mode is auto, in bytes
166 * @return Newly created resampler state
167 * @retval NULL Error: not enough memory
169 * If a full filter table would be larger than the auto threshold, and sinc_filter_mode is AUTO,
170 * the resample uses the interpolated mode instead
172 * @note A full sinc table can significantly improve the resampler's performance, but calculating the table
173 * takes longer, as opposed to the interpolated variant
175 SpeexResamplerState *speex_resampler_init_frac(spx_uint32_t nb_channels,
176 spx_uint32_t ratio_num,
177 spx_uint32_t ratio_den,
178 spx_uint32_t in_rate,
179 spx_uint32_t out_rate,
181 SpeexResamplerSincFilterMode sinc_filter_mode,
182 spx_uint32_t sinc_filter_auto_threshold,
185 /** Destroy a resampler state.
186 * @param st Resampler state
188 void speex_resampler_destroy(SpeexResamplerState *st);
190 /** Resample a float array. The input and output buffers must *not* overlap.
191 * @param st Resampler state
192 * @param channel_index Index of the channel to process for the multi-channel
194 * @param in Input buffer
195 * @param in_len Number of input samples in the input buffer. Returns the
196 * number of samples processed
197 * @param out Output buffer
198 * @param out_len Size of the output buffer. Returns the number of samples written
200 #ifdef DOUBLE_PRECISION
201 int speex_resampler_process_float(SpeexResamplerState *st,
202 spx_uint32_t channel_index,
204 spx_uint32_t *in_len,
206 spx_uint32_t *out_len);
208 int speex_resampler_process_float(SpeexResamplerState *st,
209 spx_uint32_t channel_index,
211 spx_uint32_t *in_len,
213 spx_uint32_t *out_len);
216 /** Resample an int array. The input and output buffers must *not* overlap.
217 * @param st Resampler state
218 * @param channel_index Index of the channel to process for the multi-channel
220 * @param in Input buffer
221 * @param in_len Number of input samples in the input buffer. Returns the number
222 * of samples processed
223 * @param out Output buffer
224 * @param out_len Size of the output buffer. Returns the number of samples written
226 int speex_resampler_process_int(SpeexResamplerState *st,
227 spx_uint32_t channel_index,
228 const spx_int16_t *in,
229 spx_uint32_t *in_len,
231 spx_uint32_t *out_len);
233 /** Resample an interleaved float array. The input and output buffers must *not* overlap.
234 * @param st Resampler state
235 * @param in Input buffer
236 * @param in_len Number of input samples in the input buffer. Returns the number
237 * of samples processed. This is all per-channel.
238 * @param out Output buffer
239 * @param out_len Size of the output buffer. Returns the number of samples written.
240 * This is all per-channel.
242 #ifdef DOUBLE_PRECISION
243 int speex_resampler_process_interleaved_float(SpeexResamplerState *st,
245 spx_uint32_t *in_len,
247 spx_uint32_t *out_len);
249 int speex_resampler_process_interleaved_float(SpeexResamplerState *st,
251 spx_uint32_t *in_len,
253 spx_uint32_t *out_len);
256 /** Resample an interleaved int array. The input and output buffers must *not* overlap.
257 * @param st Resampler state
258 * @param in Input buffer
259 * @param in_len Number of input samples in the input buffer. Returns the number
260 * of samples processed. This is all per-channel.
261 * @param out Output buffer
262 * @param out_len Size of the output buffer. Returns the number of samples written.
263 * This is all per-channel.
265 int speex_resampler_process_interleaved_int(SpeexResamplerState *st,
266 const spx_int16_t *in,
267 spx_uint32_t *in_len,
269 spx_uint32_t *out_len);
271 /** Set (change) the input/output sampling rates (integer value).
272 * @param st Resampler state
273 * @param in_rate Input sampling rate (integer number of Hz).
274 * @param out_rate Output sampling rate (integer number of Hz).
276 int speex_resampler_set_rate(SpeexResamplerState *st,
277 spx_uint32_t in_rate,
278 spx_uint32_t out_rate);
280 /** Get the current input/output sampling rates (integer value).
281 * @param st Resampler state
282 * @param in_rate Input sampling rate (integer number of Hz) copied.
283 * @param out_rate Output sampling rate (integer number of Hz) copied.
285 void speex_resampler_get_rate(SpeexResamplerState *st,
286 spx_uint32_t *in_rate,
287 spx_uint32_t *out_rate);
289 /** Set (change) the input/output sampling rates and resampling ratio
290 * (fractional values in Hz supported).
291 * @param st Resampler state
292 * @param ratio_num Numerator of the sampling rate ratio
293 * @param ratio_den Denominator of the sampling rate ratio
294 * @param in_rate Input sampling rate rounded to the nearest integer (in Hz).
295 * @param out_rate Output sampling rate rounded to the nearest integer (in Hz).
297 int speex_resampler_set_rate_frac(SpeexResamplerState *st,
298 spx_uint32_t ratio_num,
299 spx_uint32_t ratio_den,
300 spx_uint32_t in_rate,
301 spx_uint32_t out_rate);
303 /** Get the current resampling ratio. This will be reduced to the least
304 * common denominator.
305 * @param st Resampler state
306 * @param ratio_num Numerator of the sampling rate ratio copied
307 * @param ratio_den Denominator of the sampling rate ratio copied
309 void speex_resampler_get_ratio(SpeexResamplerState *st,
310 spx_uint32_t *ratio_num,
311 spx_uint32_t *ratio_den);
313 /** Set (change) the conversion quality.
314 * @param st Resampler state
315 * @param quality Resampling quality between 0 and 10, where 0 has poor
316 * quality and 10 has very high quality.
318 int speex_resampler_set_quality(SpeexResamplerState *st,
321 /** Get the conversion quality.
322 * @param st Resampler state
323 * @param quality Resampling quality between 0 and 10, where 0 has poor
324 * quality and 10 has very high quality.
326 void speex_resampler_get_quality(SpeexResamplerState *st,
329 /** Set (change) the input stride.
330 * @param st Resampler state
331 * @param stride Input stride
333 void speex_resampler_set_input_stride(SpeexResamplerState *st,
334 spx_uint32_t stride);
336 /** Get the input stride.
337 * @param st Resampler state
338 * @param stride Input stride copied
340 void speex_resampler_get_input_stride(SpeexResamplerState *st,
341 spx_uint32_t *stride);
343 /** Set (change) the output stride.
344 * @param st Resampler state
345 * @param stride Output stride
347 void speex_resampler_set_output_stride(SpeexResamplerState *st,
348 spx_uint32_t stride);
350 /** Get the output stride.
351 * @param st Resampler state copied
352 * @param stride Output stride
354 void speex_resampler_get_output_stride(SpeexResamplerState *st,
355 spx_uint32_t *stride);
357 /** Get the latency introduced by the resampler measured in input samples.
358 * @param st Resampler state
360 int speex_resampler_get_input_latency(SpeexResamplerState *st);
362 /** Get the latency introduced by the resampler measured in output samples.
363 * @param st Resampler state
365 int speex_resampler_get_output_latency(SpeexResamplerState *st);
367 /** Get the length of the filter in input samples.
368 * @param st Resampler state
370 int speex_resampler_get_filt_len(SpeexResamplerState *st);
372 /** Returns 1 if the full sinc filter table is used, 0 if the interpolated one is used
373 * @param st Resampler state
374 * @return Sinc filter mode
376 int speex_resampler_get_sinc_filter_mode(SpeexResamplerState *st);
378 /** Make sure that the first samples to go out of the resamplers don't have
379 * leading zeros. This is only useful before starting to use a newly created
380 * resampler. It is recommended to use that when resampling an audio file, as
381 * it will generate a file with the same length. For real-time processing,
382 * it is probably easier not to use this call (so that the output duration
383 * is the same for the first frame).
384 * @param st Resampler state
386 int speex_resampler_skip_zeros(SpeexResamplerState *st);
388 /** Reset a resampler so a new (unrelated) stream can be processed.
389 * @param st Resampler state
391 int speex_resampler_reset_mem(SpeexResamplerState *st);
393 /** Returns the English meaning for an error code
394 * @param err Error code
395 * @return English string
397 const char *speex_resampler_strerror(int err);