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345 lines
14 KiB
C
345 lines
14 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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#define OUTSIDE_SPEEX
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#ifdef OUTSIDE_SPEEX
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/********* WARNING: MENTAL SANITY ENDS HERE *************/
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/* If the resampler is defined outside of Speex, we change the symbol names so that
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there won't be any clash if linking with Speex later on. */
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#define RANDOM_PREFIX ast
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#ifndef RANDOM_PREFIX
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#error "Please define RANDOM_PREFIX (above) to something specific to your project to prevent symbol name clashes"
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#endif
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#define CAT_PREFIX2(a,b) a ## b
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#define CAT_PREFIX(a,b) CAT_PREFIX2(a, b)
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#define speex_resampler_init CAT_PREFIX(RANDOM_PREFIX,_resampler_init)
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#define speex_resampler_init_frac CAT_PREFIX(RANDOM_PREFIX,_resampler_init_frac)
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#define speex_resampler_destroy CAT_PREFIX(RANDOM_PREFIX,_resampler_destroy)
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#define speex_resampler_process_float CAT_PREFIX(RANDOM_PREFIX,_resampler_process_float)
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#define speex_resampler_process_int CAT_PREFIX(RANDOM_PREFIX,_resampler_process_int)
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#define speex_resampler_process_interleaved_float CAT_PREFIX(RANDOM_PREFIX,_resampler_process_interleaved_float)
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#define speex_resampler_process_interleaved_int CAT_PREFIX(RANDOM_PREFIX,_resampler_process_interleaved_int)
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#define speex_resampler_set_rate CAT_PREFIX(RANDOM_PREFIX,_resampler_set_rate)
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#define speex_resampler_get_rate CAT_PREFIX(RANDOM_PREFIX,_resampler_get_rate)
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#define speex_resampler_set_rate_frac CAT_PREFIX(RANDOM_PREFIX,_resampler_set_rate_frac)
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#define speex_resampler_get_ratio CAT_PREFIX(RANDOM_PREFIX,_resampler_get_ratio)
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#define speex_resampler_set_quality CAT_PREFIX(RANDOM_PREFIX,_resampler_set_quality)
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#define speex_resampler_get_quality CAT_PREFIX(RANDOM_PREFIX,_resampler_get_quality)
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#define speex_resampler_set_input_stride CAT_PREFIX(RANDOM_PREFIX,_resampler_set_input_stride)
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#define speex_resampler_get_input_stride CAT_PREFIX(RANDOM_PREFIX,_resampler_get_input_stride)
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#define speex_resampler_set_output_stride CAT_PREFIX(RANDOM_PREFIX,_resampler_set_output_stride)
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#define speex_resampler_get_output_stride CAT_PREFIX(RANDOM_PREFIX,_resampler_get_output_stride)
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#define speex_resampler_get_input_latency CAT_PREFIX(RANDOM_PREFIX,_resampler_get_input_latency)
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#define speex_resampler_get_output_latency CAT_PREFIX(RANDOM_PREFIX,_resampler_get_output_latency)
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#define speex_resampler_skip_zeros CAT_PREFIX(RANDOM_PREFIX,_resampler_skip_zeros)
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#define speex_resampler_reset_mem CAT_PREFIX(RANDOM_PREFIX,_resampler_reset_mem)
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#define speex_resampler_strerror CAT_PREFIX(RANDOM_PREFIX,_resampler_strerror)
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#define spx_int16_t short
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#define spx_int32_t int
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#define spx_uint16_t unsigned short
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#define spx_uint32_t unsigned int
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#else /* OUTSIDE_SPEEX */
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#include "speex/speex_types.h"
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#endif /* OUTSIDE_SPEEX */
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#ifdef __cplusplus
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extern "C" {
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#endif
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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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struct SpeexResamplerState_;
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typedef struct SpeexResamplerState_ SpeexResamplerState;
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/** \brief 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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* \param err
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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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SpeexResamplerState *speex_resampler_init(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 *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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* @param err
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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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SpeexResamplerState *speex_resampler_init_frac(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 *err);
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/** Destroy a resampler state.
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* @param st Resampler state
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*/
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void speex_resampler_destroy(SpeexResamplerState *st);
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/** Resample a float 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
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* number 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_float(SpeexResamplerState *st,
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spx_uint32_t channel_index,
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const float *in,
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spx_uint32_t *in_len,
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float *out,
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spx_uint32_t *out_len);
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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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/** Resample an interleaved float array. The input and output buffers must *not* overlap.
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* @param st Resampler state
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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. This is all per-channel.
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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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* This is all per-channel.
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*/
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int speex_resampler_process_interleaved_float(SpeexResamplerState *st,
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const float *in,
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spx_uint32_t *in_len,
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float *out,
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spx_uint32_t *out_len);
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/** Resample an interleaved int array. The input and output buffers must *not* overlap.
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* @param st Resampler state
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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. This is all per-channel.
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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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* This is all per-channel.
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*/
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int speex_resampler_process_interleaved_int(SpeexResamplerState *st,
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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 (integer value).
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* @param st Resampler state
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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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*/
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int speex_resampler_set_rate(SpeexResamplerState *st,
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spx_uint32_t in_rate,
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spx_uint32_t out_rate);
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/** Get the current input/output sampling rates (integer value).
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* @param st Resampler state
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* @param in_rate Input sampling rate (integer number of Hz) copied.
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* @param out_rate Output sampling rate (integer number of Hz) copied.
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*/
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void speex_resampler_get_rate(SpeexResamplerState *st,
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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 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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/** Get the current resampling ratio. This will be reduced to the least
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* common denominator.
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* @param st Resampler state
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* @param ratio_num Numerator of the sampling rate ratio copied
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* @param ratio_den Denominator of the sampling rate ratio copied
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*/
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void speex_resampler_get_ratio(SpeexResamplerState *st,
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spx_uint32_t *ratio_num,
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spx_uint32_t *ratio_den);
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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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/** Get 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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void speex_resampler_get_quality(SpeexResamplerState *st,
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int *quality);
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/** Set (change) the input stride.
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* @param st Resampler state
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* @param stride Input stride
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*/
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void speex_resampler_set_input_stride(SpeexResamplerState *st,
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spx_uint32_t stride);
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/** Get the input stride.
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* @param st Resampler state
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* @param stride Input stride copied
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*/
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void speex_resampler_get_input_stride(SpeexResamplerState *st,
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spx_uint32_t *stride);
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/** Set (change) the output stride.
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* @param st Resampler state
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* @param stride Output stride
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*/
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void speex_resampler_set_output_stride(SpeexResamplerState *st,
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spx_uint32_t stride);
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/** Get the output stride.
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* @param st Resampler state copied
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* @param stride Output stride
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*/
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void speex_resampler_get_output_stride(SpeexResamplerState *st,
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spx_uint32_t *stride);
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/** Get the latency in input samples introduced by the resampler.
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* @param st Resampler state
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*/
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int speex_resampler_get_input_latency(SpeexResamplerState *st);
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/** Get the latency in output samples introduced by the resampler.
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* @param st Resampler state
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*/
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int speex_resampler_get_output_latency(SpeexResamplerState *st);
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/** Make sure that the first samples to go out of the resamplers don't have
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* leading zeros. This is only useful before starting to use a newly created
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* resampler. It is recommended to use that when resampling an audio file, as
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* it will generate a file with the same length. For real-time processing,
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* it is probably easier not to use this call (so that the output duration
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* is the same for the first frame).
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* @param st Resampler state
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*/
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int speex_resampler_skip_zeros(SpeexResamplerState *st);
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/** Reset a resampler so a new (unrelated) stream can be processed.
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* @param st Resampler state
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*/
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int speex_resampler_reset_mem(SpeexResamplerState *st);
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/** Returns the English meaning for an error code
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* @param err Error code
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* @return English string
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*/
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const char *speex_resampler_strerror(int err);
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#ifdef __cplusplus
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}
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#endif
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#endif
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