239 lines
7.3 KiB
C
239 lines
7.3 KiB
C
/* Copyright (C) 2007 Jean-Marc Valin
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File: speex_resampler.h
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Resampling code
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The design goals of this code are:
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- Very fast algorithm
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- Low memory requirement
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- Good *perceptual* quality (and not best SNR)
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. The name of the author may not be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SPEEX_RESAMPLER_H
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#define SPEEX_RESAMPLER_H
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/* We don't support visibility on Win32 */
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#define EXPORT
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//#define RESAMPLE_CAL
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typedef short spx_int16_t;
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typedef int spx_int32_t;
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typedef unsigned short spx_uint16_t;
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typedef unsigned int spx_uint32_t;
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typedef short spx_word16_t;
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typedef int spx_word32_t;
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#define SPEEX_RESAMPLER_QUALITY_MAX 10
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#define SPEEX_RESAMPLER_QUALITY_MIN 0
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#define SPEEX_RESAMPLER_QUALITY_DEFAULT 4
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#define SPEEX_RESAMPLER_QUALITY_VOIP 3
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#define SPEEX_RESAMPLER_QUALITY_DESKTOP 5
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enum {
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RESAMPLER_ERR_SUCCESS = 0,
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RESAMPLER_ERR_ALLOC_FAILED = 1,
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RESAMPLER_ERR_BAD_STATE = 2,
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RESAMPLER_ERR_INVALID_ARG = 3,
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RESAMPLER_ERR_PTR_OVERLAP = 4,
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RESAMPLER_ERR_MAX_ERROR
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};
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enum {
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RESAMPLER_MODE_CAL = 0,
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RESAMPLER_MODE_8KTO64K = 1,
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RESAMPLER_MODE_64KTO8K = 2,
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RESAMPLER_MODE_ERROR
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};
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#define RESAMPLE_MAXCHANNEL 1//xuml add
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#define RESAMPLE_MAXSINCBUF 512//xuml add
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#define RESAMPLE_MAXMEMBUF 680//xuml add
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struct SpeexResamplerState_;
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typedef struct SpeexResamplerState_ SpeexResamplerState;
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typedef int(*resampler_basic_func)(SpeexResamplerState *, spx_uint32_t, const spx_word16_t *, spx_uint32_t *, spx_word16_t *, spx_uint32_t *);
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struct SpeexResamplerState_ {
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spx_uint32_t in_rate;
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spx_uint32_t out_rate;
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spx_uint32_t num_rate;
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spx_uint32_t den_rate;
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int quality;
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spx_uint32_t nb_channels;
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spx_uint32_t filt_len;
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spx_uint32_t mem_alloc_size;
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spx_uint32_t buffer_size;
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int int_advance;
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int frac_advance;
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float cutoff;
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spx_uint32_t oversample;
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int initialised;
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int started;
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/* These are per-channel */
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spx_int32_t last_sample[RESAMPLE_MAXCHANNEL];
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spx_uint32_t samp_frac_num[RESAMPLE_MAXCHANNEL];
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spx_uint32_t magic_samples[RESAMPLE_MAXCHANNEL];
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spx_word16_t mem[RESAMPLE_MAXMEMBUF];
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//spx_word16_t *mem;
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#ifdef RESAMPLE_CAL
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spx_word16_t sinc_table[RESAMPLE_MAXSINCBUF];
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#else
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const spx_word16_t *sinc_table;
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#endif
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spx_uint32_t sinc_table_length;
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resampler_basic_func resampler_ptr;
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int in_stride;
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int out_stride;
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int mode;
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};
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/** Create a new resampler with integer input and output rates.
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* @param nb_channels Number of channels to be processed
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* @param in_rate Input sampling rate (integer number of Hz).
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* @param out_rate Output sampling rate (integer number of Hz).
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* @param quality Resampling quality between 0 and 10, where 0 has poor quality
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* and 10 has very high quality.
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* @return Newly created resampler state
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* @retval NULL Error: not enough memory
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*/
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void speex_resampler_init(SpeexResamplerState *st,
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spx_uint32_t nb_channels,
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spx_uint32_t in_rate,
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spx_uint32_t out_rate,
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int quality,
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int mode,
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int *err);
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/** Create a new resampler with fractional input/output rates. The sampling
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* rate ratio is an arbitrary rational number with both the numerator and
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* denominator being 32-bit integers.
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* @param nb_channels Number of channels to be processed
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* @param ratio_num Numerator of the sampling rate ratio
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* @param ratio_den Denominator of the sampling rate ratio
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* @param in_rate Input sampling rate rounded to the nearest integer (in Hz).
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* @param out_rate Output sampling rate rounded to the nearest integer (in Hz).
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* @param quality Resampling quality between 0 and 10, where 0 has poor quality
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* and 10 has very high quality.
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* @return Newly created resampler state
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* @retval NULL Error: not enough memory
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*/
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void speex_resampler_init_frac(SpeexResamplerState *st,
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spx_uint32_t nb_channels,
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spx_uint32_t ratio_num,
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spx_uint32_t ratio_den,
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spx_uint32_t in_rate,
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spx_uint32_t out_rate,
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int quality,
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int mode,
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int *err);
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/** Resample an int array. The input and output buffers must *not* overlap.
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* @param st Resampler state
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* @param channel_index Index of the channel to process for the multi-channel
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* base (0 otherwise)
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* @param in Input buffer
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* @param in_len Number of input samples in the input buffer. Returns the number
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* of samples processed
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* @param out Output buffer
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* @param out_len Size of the output buffer. Returns the number of samples written
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*/
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int speex_resampler_process_int(SpeexResamplerState *st,
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spx_uint32_t channel_index,
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const spx_int16_t *in,
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spx_uint32_t *in_len,
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spx_int16_t *out,
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spx_uint32_t *out_len);
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/** Set (change) the input/output sampling rates and resampling ratio
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* (fractional values in Hz supported).
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* @param st Resampler state
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* @param ratio_num Numerator of the sampling rate ratio
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* @param ratio_den Denominator of the sampling rate ratio
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* @param in_rate Input sampling rate rounded to the nearest integer (in Hz).
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* @param out_rate Output sampling rate rounded to the nearest integer (in Hz).
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*/
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int speex_resampler_set_rate_frac(SpeexResamplerState *st,
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spx_uint32_t ratio_num,
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spx_uint32_t ratio_den,
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spx_uint32_t in_rate,
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spx_uint32_t out_rate);
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/** Set (change) the conversion quality.
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* @param st Resampler state
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* @param quality Resampling quality between 0 and 10, where 0 has poor
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* quality and 10 has very high quality.
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*/
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int speex_resampler_set_quality(SpeexResamplerState *st,
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int quality);
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#endif
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