343 lines
14 KiB
C
343 lines
14 KiB
C
/* Copyright (C) 2007 Jean-Marc Valin
|
|
|
|
File: speex_resampler.h
|
|
Resampling code
|
|
|
|
The design goals of this code are:
|
|
- Very fast algorithm
|
|
- Low memory requirement
|
|
- Good *perceptual* quality (and not best SNR)
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are
|
|
met:
|
|
|
|
1. Redistributions of source code must retain the above copyright notice,
|
|
this list of conditions and the following disclaimer.
|
|
|
|
2. Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in the
|
|
documentation and/or other materials provided with the distribution.
|
|
|
|
3. The name of the author may not be used to endorse or promote products
|
|
derived from this software without specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
|
|
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
|
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
|
|
#ifndef SPEEX_RESAMPLER_H
|
|
#define SPEEX_RESAMPLER_H
|
|
|
|
#ifdef OUTSIDE_SPEEX
|
|
|
|
/********* WARNING: MENTAL SANITY ENDS HERE *************/
|
|
|
|
/* If the resampler is defined outside of Speex, we change the symbol names so that
|
|
there won't be any clash if linking with Speex later on. */
|
|
|
|
#define RANDOM_PREFIX speex
|
|
#ifndef RANDOM_PREFIX
|
|
#error "Please define RANDOM_PREFIX (above) to something specific to your project to prevent symbol name clashes"
|
|
#endif
|
|
|
|
#define CAT_PREFIX2(a,b) a ## b
|
|
#define CAT_PREFIX(a,b) CAT_PREFIX2(a, b)
|
|
|
|
#define speex_resampler_init CAT_PREFIX(RANDOM_PREFIX,_resampler_init)
|
|
#define speex_resampler_init_frac CAT_PREFIX(RANDOM_PREFIX,_resampler_init_frac)
|
|
#define speex_resampler_destroy CAT_PREFIX(RANDOM_PREFIX,_resampler_destroy)
|
|
#define speex_resampler_process_float CAT_PREFIX(RANDOM_PREFIX,_resampler_process_float)
|
|
#define speex_resampler_process_int CAT_PREFIX(RANDOM_PREFIX,_resampler_process_int)
|
|
#define speex_resampler_process_interleaved_float CAT_PREFIX(RANDOM_PREFIX,_resampler_process_interleaved_float)
|
|
#define speex_resampler_process_interleaved_int CAT_PREFIX(RANDOM_PREFIX,_resampler_process_interleaved_int)
|
|
#define speex_resampler_set_rate CAT_PREFIX(RANDOM_PREFIX,_resampler_set_rate)
|
|
#define speex_resampler_get_rate CAT_PREFIX(RANDOM_PREFIX,_resampler_get_rate)
|
|
#define speex_resampler_set_rate_frac CAT_PREFIX(RANDOM_PREFIX,_resampler_set_rate_frac)
|
|
#define speex_resampler_get_ratio CAT_PREFIX(RANDOM_PREFIX,_resampler_get_ratio)
|
|
#define speex_resampler_set_quality CAT_PREFIX(RANDOM_PREFIX,_resampler_set_quality)
|
|
#define speex_resampler_get_quality CAT_PREFIX(RANDOM_PREFIX,_resampler_get_quality)
|
|
#define speex_resampler_set_input_stride CAT_PREFIX(RANDOM_PREFIX,_resampler_set_input_stride)
|
|
#define speex_resampler_get_input_stride CAT_PREFIX(RANDOM_PREFIX,_resampler_get_input_stride)
|
|
#define speex_resampler_set_output_stride CAT_PREFIX(RANDOM_PREFIX,_resampler_set_output_stride)
|
|
#define speex_resampler_get_output_stride CAT_PREFIX(RANDOM_PREFIX,_resampler_get_output_stride)
|
|
#define speex_resampler_get_input_latency CAT_PREFIX(RANDOM_PREFIX,_resampler_get_input_latency)
|
|
#define speex_resampler_get_output_latency CAT_PREFIX(RANDOM_PREFIX,_resampler_get_output_latency)
|
|
#define speex_resampler_skip_zeros CAT_PREFIX(RANDOM_PREFIX,_resampler_skip_zeros)
|
|
#define speex_resampler_reset_mem CAT_PREFIX(RANDOM_PREFIX,_resampler_reset_mem)
|
|
#define speex_resampler_strerror CAT_PREFIX(RANDOM_PREFIX,_resampler_strerror)
|
|
|
|
#define spx_int16_t short
|
|
#define spx_int32_t int
|
|
#define spx_uint16_t unsigned short
|
|
#define spx_uint32_t unsigned int
|
|
|
|
#else /* OUTSIDE_SPEEX */
|
|
|
|
#include "speex/speex_types.h"
|
|
|
|
#endif /* OUTSIDE_SPEEX */
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
#define SPEEX_RESAMPLER_QUALITY_MAX 10
|
|
#define SPEEX_RESAMPLER_QUALITY_MIN 0
|
|
#define SPEEX_RESAMPLER_QUALITY_DEFAULT 4
|
|
#define SPEEX_RESAMPLER_QUALITY_VOIP 3
|
|
#define SPEEX_RESAMPLER_QUALITY_DESKTOP 5
|
|
|
|
enum {
|
|
RESAMPLER_ERR_SUCCESS = 0,
|
|
RESAMPLER_ERR_ALLOC_FAILED = 1,
|
|
RESAMPLER_ERR_BAD_STATE = 2,
|
|
RESAMPLER_ERR_INVALID_ARG = 3,
|
|
RESAMPLER_ERR_PTR_OVERLAP = 4,
|
|
|
|
RESAMPLER_ERR_MAX_ERROR
|
|
};
|
|
|
|
struct SpeexResamplerState_;
|
|
typedef struct SpeexResamplerState_ SpeexResamplerState;
|
|
|
|
/** \brief Create a new resampler with integer input and output rates.
|
|
* \param nb_channels Number of channels to be processed
|
|
* \param in_rate Input sampling rate (integer number of Hz).
|
|
* \param out_rate Output sampling rate (integer number of Hz).
|
|
* \param quality Resampling quality between 0 and 10, where 0 has poor quality
|
|
* and 10 has very high quality.
|
|
* \param err
|
|
* \return Newly created resampler state
|
|
* \retval NULL Error: not enough memory
|
|
*/
|
|
SpeexResamplerState *speex_resampler_init(spx_uint32_t nb_channels,
|
|
spx_uint32_t in_rate,
|
|
spx_uint32_t out_rate,
|
|
int quality,
|
|
int *err);
|
|
|
|
/** Create a new resampler with fractional input/output rates. The sampling
|
|
* rate ratio is an arbitrary rational number with both the numerator and
|
|
* denominator being 32-bit integers.
|
|
* @param nb_channels Number of channels to be processed
|
|
* @param ratio_num Numerator of the sampling rate ratio
|
|
* @param ratio_den Denominator of the sampling rate ratio
|
|
* @param in_rate Input sampling rate rounded to the nearest integer (in Hz).
|
|
* @param out_rate Output sampling rate rounded to the nearest integer (in Hz).
|
|
* @param quality Resampling quality between 0 and 10, where 0 has poor quality
|
|
* and 10 has very high quality.
|
|
* @param err
|
|
* @return Newly created resampler state
|
|
* @retval NULL Error: not enough memory
|
|
*/
|
|
SpeexResamplerState *speex_resampler_init_frac(spx_uint32_t nb_channels,
|
|
spx_uint32_t ratio_num,
|
|
spx_uint32_t ratio_den,
|
|
spx_uint32_t in_rate,
|
|
spx_uint32_t out_rate,
|
|
int quality,
|
|
int *err);
|
|
|
|
/** Destroy a resampler state.
|
|
* @param st Resampler state
|
|
*/
|
|
void speex_resampler_destroy(SpeexResamplerState *st);
|
|
|
|
/** Resample a float array. The input and output buffers must *not* overlap.
|
|
* @param st Resampler state
|
|
* @param channel_index Index of the channel to process for the multi-channel
|
|
* base (0 otherwise)
|
|
* @param in Input buffer
|
|
* @param in_len Number of input samples in the input buffer. Returns the
|
|
* number of samples processed
|
|
* @param out Output buffer
|
|
* @param out_len Size of the output buffer. Returns the number of samples written
|
|
*/
|
|
int speex_resampler_process_float(SpeexResamplerState *st,
|
|
spx_uint32_t channel_index,
|
|
const float *in,
|
|
spx_uint32_t *in_len,
|
|
float *out,
|
|
spx_uint32_t *out_len);
|
|
|
|
/** Resample an int array. The input and output buffers must *not* overlap.
|
|
* @param st Resampler state
|
|
* @param channel_index Index of the channel to process for the multi-channel
|
|
* base (0 otherwise)
|
|
* @param in Input buffer
|
|
* @param in_len Number of input samples in the input buffer. Returns the number
|
|
* of samples processed
|
|
* @param out Output buffer
|
|
* @param out_len Size of the output buffer. Returns the number of samples written
|
|
*/
|
|
int speex_resampler_process_int(SpeexResamplerState *st,
|
|
spx_uint32_t channel_index,
|
|
const spx_int16_t *in,
|
|
spx_uint32_t *in_len,
|
|
spx_int16_t *out,
|
|
spx_uint32_t *out_len);
|
|
|
|
/** Resample an interleaved float array. The input and output buffers must *not* overlap.
|
|
* @param st Resampler state
|
|
* @param in Input buffer
|
|
* @param in_len Number of input samples in the input buffer. Returns the number
|
|
* of samples processed. This is all per-channel.
|
|
* @param out Output buffer
|
|
* @param out_len Size of the output buffer. Returns the number of samples written.
|
|
* This is all per-channel.
|
|
*/
|
|
int speex_resampler_process_interleaved_float(SpeexResamplerState *st,
|
|
const float *in,
|
|
spx_uint32_t *in_len,
|
|
float *out,
|
|
spx_uint32_t *out_len);
|
|
|
|
/** Resample an interleaved int array. The input and output buffers must *not* overlap.
|
|
* @param st Resampler state
|
|
* @param in Input buffer
|
|
* @param in_len Number of input samples in the input buffer. Returns the number
|
|
* of samples processed. This is all per-channel.
|
|
* @param out Output buffer
|
|
* @param out_len Size of the output buffer. Returns the number of samples written.
|
|
* This is all per-channel.
|
|
*/
|
|
int speex_resampler_process_interleaved_int(SpeexResamplerState *st,
|
|
const spx_int16_t *in,
|
|
spx_uint32_t *in_len,
|
|
spx_int16_t *out,
|
|
spx_uint32_t *out_len);
|
|
|
|
/** Set (change) the input/output sampling rates (integer value).
|
|
* @param st Resampler state
|
|
* @param in_rate Input sampling rate (integer number of Hz).
|
|
* @param out_rate Output sampling rate (integer number of Hz).
|
|
*/
|
|
int speex_resampler_set_rate(SpeexResamplerState *st,
|
|
spx_uint32_t in_rate,
|
|
spx_uint32_t out_rate);
|
|
|
|
/** Get the current input/output sampling rates (integer value).
|
|
* @param st Resampler state
|
|
* @param in_rate Input sampling rate (integer number of Hz) copied.
|
|
* @param out_rate Output sampling rate (integer number of Hz) copied.
|
|
*/
|
|
void speex_resampler_get_rate(SpeexResamplerState *st,
|
|
spx_uint32_t *in_rate,
|
|
spx_uint32_t *out_rate);
|
|
|
|
/** Set (change) the input/output sampling rates and resampling ratio
|
|
* (fractional values in Hz supported).
|
|
* @param st Resampler state
|
|
* @param ratio_num Numerator of the sampling rate ratio
|
|
* @param ratio_den Denominator of the sampling rate ratio
|
|
* @param in_rate Input sampling rate rounded to the nearest integer (in Hz).
|
|
* @param out_rate Output sampling rate rounded to the nearest integer (in Hz).
|
|
*/
|
|
int speex_resampler_set_rate_frac(SpeexResamplerState *st,
|
|
spx_uint32_t ratio_num,
|
|
spx_uint32_t ratio_den,
|
|
spx_uint32_t in_rate,
|
|
spx_uint32_t out_rate);
|
|
|
|
/** Get the current resampling ratio. This will be reduced to the least
|
|
* common denominator.
|
|
* @param st Resampler state
|
|
* @param ratio_num Numerator of the sampling rate ratio copied
|
|
* @param ratio_den Denominator of the sampling rate ratio copied
|
|
*/
|
|
void speex_resampler_get_ratio(SpeexResamplerState *st,
|
|
spx_uint32_t *ratio_num,
|
|
spx_uint32_t *ratio_den);
|
|
|
|
/** Set (change) the conversion quality.
|
|
* @param st Resampler state
|
|
* @param quality Resampling quality between 0 and 10, where 0 has poor
|
|
* quality and 10 has very high quality.
|
|
*/
|
|
int speex_resampler_set_quality(SpeexResamplerState *st,
|
|
int quality);
|
|
|
|
/** Get the conversion quality.
|
|
* @param st Resampler state
|
|
* @param quality Resampling quality between 0 and 10, where 0 has poor
|
|
* quality and 10 has very high quality.
|
|
*/
|
|
void speex_resampler_get_quality(SpeexResamplerState *st,
|
|
int *quality);
|
|
|
|
/** Set (change) the input stride.
|
|
* @param st Resampler state
|
|
* @param stride Input stride
|
|
*/
|
|
void speex_resampler_set_input_stride(SpeexResamplerState *st,
|
|
spx_uint32_t stride);
|
|
|
|
/** Get the input stride.
|
|
* @param st Resampler state
|
|
* @param stride Input stride copied
|
|
*/
|
|
void speex_resampler_get_input_stride(SpeexResamplerState *st,
|
|
spx_uint32_t *stride);
|
|
|
|
/** Set (change) the output stride.
|
|
* @param st Resampler state
|
|
* @param stride Output stride
|
|
*/
|
|
void speex_resampler_set_output_stride(SpeexResamplerState *st,
|
|
spx_uint32_t stride);
|
|
|
|
/** Get the output stride.
|
|
* @param st Resampler state copied
|
|
* @param stride Output stride
|
|
*/
|
|
void speex_resampler_get_output_stride(SpeexResamplerState *st,
|
|
spx_uint32_t *stride);
|
|
|
|
/** Get the latency in input samples introduced by the resampler.
|
|
* @param st Resampler state
|
|
*/
|
|
int speex_resampler_get_input_latency(SpeexResamplerState *st);
|
|
|
|
/** Get the latency in output samples introduced by the resampler.
|
|
* @param st Resampler state
|
|
*/
|
|
int speex_resampler_get_output_latency(SpeexResamplerState *st);
|
|
|
|
/** Make sure that the first samples to go out of the resamplers don't have
|
|
* leading zeros. This is only useful before starting to use a newly created
|
|
* resampler. It is recommended to use that when resampling an audio file, as
|
|
* it will generate a file with the same length. For real-time processing,
|
|
* it is probably easier not to use this call (so that the output duration
|
|
* is the same for the first frame).
|
|
* @param st Resampler state
|
|
*/
|
|
int speex_resampler_skip_zeros(SpeexResamplerState *st);
|
|
|
|
/** Reset a resampler so a new (unrelated) stream can be processed.
|
|
* @param st Resampler state
|
|
*/
|
|
int speex_resampler_reset_mem(SpeexResamplerState *st);
|
|
|
|
/** Returns the English meaning for an error code
|
|
* @param err Error code
|
|
* @return English string
|
|
*/
|
|
const char *speex_resampler_strerror(int err);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|