293 lines
11 KiB
C
293 lines
11 KiB
C
/*
|
|
* Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* Libav is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef AVRESAMPLE_AVRESAMPLE_H
|
|
#define AVRESAMPLE_AVRESAMPLE_H
|
|
|
|
/**
|
|
* @file
|
|
* external API header
|
|
*/
|
|
|
|
#include "libavutil/audioconvert.h"
|
|
#include "libavutil/avutil.h"
|
|
#include "libavutil/dict.h"
|
|
#include "libavutil/log.h"
|
|
|
|
#include "libavresample/version.h"
|
|
|
|
#define AVRESAMPLE_MAX_CHANNELS 32
|
|
|
|
typedef struct AVAudioResampleContext AVAudioResampleContext;
|
|
|
|
/** Mixing Coefficient Types */
|
|
enum AVMixCoeffType {
|
|
AV_MIX_COEFF_TYPE_Q8, /** 16-bit 8.8 fixed-point */
|
|
AV_MIX_COEFF_TYPE_Q15, /** 32-bit 17.15 fixed-point */
|
|
AV_MIX_COEFF_TYPE_FLT, /** floating-point */
|
|
AV_MIX_COEFF_TYPE_NB, /** Number of coeff types. Not part of ABI */
|
|
};
|
|
|
|
/** Resampling Filter Types */
|
|
enum AVResampleFilterType {
|
|
AV_RESAMPLE_FILTER_TYPE_CUBIC, /**< Cubic */
|
|
AV_RESAMPLE_FILTER_TYPE_BLACKMAN_NUTTALL, /**< Blackman Nuttall Windowed Sinc */
|
|
AV_RESAMPLE_FILTER_TYPE_KAISER, /**< Kaiser Windowed Sinc */
|
|
};
|
|
|
|
/**
|
|
* Return the LIBAVRESAMPLE_VERSION_INT constant.
|
|
*/
|
|
unsigned avresample_version(void);
|
|
|
|
/**
|
|
* Return the libavresample build-time configuration.
|
|
* @return configure string
|
|
*/
|
|
const char *avresample_configuration(void);
|
|
|
|
/**
|
|
* Return the libavresample license.
|
|
*/
|
|
const char *avresample_license(void);
|
|
|
|
/**
|
|
* Get the AVClass for AVAudioResampleContext.
|
|
*
|
|
* Can be used in combination with AV_OPT_SEARCH_FAKE_OBJ for examining options
|
|
* without allocating a context.
|
|
*
|
|
* @see av_opt_find().
|
|
*
|
|
* @return AVClass for AVAudioResampleContext
|
|
*/
|
|
const AVClass *avresample_get_class(void);
|
|
|
|
/**
|
|
* Allocate AVAudioResampleContext and set options.
|
|
*
|
|
* @return allocated audio resample context, or NULL on failure
|
|
*/
|
|
AVAudioResampleContext *avresample_alloc_context(void);
|
|
|
|
/**
|
|
* Initialize AVAudioResampleContext.
|
|
*
|
|
* @param avr audio resample context
|
|
* @return 0 on success, negative AVERROR code on failure
|
|
*/
|
|
int avresample_open(AVAudioResampleContext *avr);
|
|
|
|
/**
|
|
* Close AVAudioResampleContext.
|
|
*
|
|
* This closes the context, but it does not change the parameters. The context
|
|
* can be reopened with avresample_open(). It does, however, clear the output
|
|
* FIFO and any remaining leftover samples in the resampling delay buffer. If
|
|
* there was a custom matrix being used, that is also cleared.
|
|
*
|
|
* @see avresample_convert()
|
|
* @see avresample_set_matrix()
|
|
*
|
|
* @param avr audio resample context
|
|
*/
|
|
void avresample_close(AVAudioResampleContext *avr);
|
|
|
|
/**
|
|
* Free AVAudioResampleContext and associated AVOption values.
|
|
*
|
|
* This also calls avresample_close() before freeing.
|
|
*
|
|
* @param avr audio resample context
|
|
*/
|
|
void avresample_free(AVAudioResampleContext **avr);
|
|
|
|
/**
|
|
* Generate a channel mixing matrix.
|
|
*
|
|
* This function is the one used internally by libavresample for building the
|
|
* default mixing matrix. It is made public just as a utility function for
|
|
* building custom matrices.
|
|
*
|
|
* @param in_layout input channel layout
|
|
* @param out_layout output channel layout
|
|
* @param center_mix_level mix level for the center channel
|
|
* @param surround_mix_level mix level for the surround channel(s)
|
|
* @param lfe_mix_level mix level for the low-frequency effects channel
|
|
* @param normalize if 1, coefficients will be normalized to prevent
|
|
* overflow. if 0, coefficients will not be
|
|
* normalized.
|
|
* @param[out] matrix mixing coefficients; matrix[i + stride * o] is
|
|
* the weight of input channel i in output channel o.
|
|
* @param stride distance between adjacent input channels in the
|
|
* matrix array
|
|
* @param matrix_encoding matrixed stereo downmix mode (e.g. dplii)
|
|
* @return 0 on success, negative AVERROR code on failure
|
|
*/
|
|
int avresample_build_matrix(uint64_t in_layout, uint64_t out_layout,
|
|
double center_mix_level, double surround_mix_level,
|
|
double lfe_mix_level, int normalize, double *matrix,
|
|
int stride, enum AVMatrixEncoding matrix_encoding);
|
|
|
|
/**
|
|
* Get the current channel mixing matrix.
|
|
*
|
|
* @param avr audio resample context
|
|
* @param matrix mixing coefficients; matrix[i + stride * o] is the weight of
|
|
* input channel i in output channel o.
|
|
* @param stride distance between adjacent input channels in the matrix array
|
|
* @return 0 on success, negative AVERROR code on failure
|
|
*/
|
|
int avresample_get_matrix(AVAudioResampleContext *avr, double *matrix,
|
|
int stride);
|
|
|
|
/**
|
|
* Set channel mixing matrix.
|
|
*
|
|
* Allows for setting a custom mixing matrix, overriding the default matrix
|
|
* generated internally during avresample_open(). This function can be called
|
|
* anytime on an allocated context, either before or after calling
|
|
* avresample_open(). avresample_convert() always uses the current matrix.
|
|
* Calling avresample_close() on the context will clear the current matrix.
|
|
*
|
|
* @see avresample_close()
|
|
*
|
|
* @param avr audio resample context
|
|
* @param matrix mixing coefficients; matrix[i + stride * o] is the weight of
|
|
* input channel i in output channel o.
|
|
* @param stride distance between adjacent input channels in the matrix array
|
|
* @return 0 on success, negative AVERROR code on failure
|
|
*/
|
|
int avresample_set_matrix(AVAudioResampleContext *avr, const double *matrix,
|
|
int stride);
|
|
|
|
/**
|
|
* Set compensation for resampling.
|
|
*
|
|
* This can be called anytime after avresample_open(). If resampling was not
|
|
* being done previously, the AVAudioResampleContext is closed and reopened
|
|
* with resampling enabled. In this case, any samples remaining in the output
|
|
* FIFO and the current channel mixing matrix will be restored after reopening
|
|
* the context.
|
|
*
|
|
* @param avr audio resample context
|
|
* @param sample_delta compensation delta, in samples
|
|
* @param compensation_distance compensation distance, in samples
|
|
* @return 0 on success, negative AVERROR code on failure
|
|
*/
|
|
int avresample_set_compensation(AVAudioResampleContext *avr, int sample_delta,
|
|
int compensation_distance);
|
|
|
|
/**
|
|
* Convert input samples and write them to the output FIFO.
|
|
*
|
|
* The output data can be NULL or have fewer allocated samples than required.
|
|
* In this case, any remaining samples not written to the output will be added
|
|
* to an internal FIFO buffer, to be returned at the next call to this function
|
|
* or to avresample_read().
|
|
*
|
|
* If converting sample rate, there may be data remaining in the internal
|
|
* resampling delay buffer. avresample_get_delay() tells the number of remaining
|
|
* samples. To get this data as output, call avresample_convert() with NULL
|
|
* input.
|
|
*
|
|
* At the end of the conversion process, there may be data remaining in the
|
|
* internal FIFO buffer. avresample_available() tells the number of remaining
|
|
* samples. To get this data as output, either call avresample_convert() with
|
|
* NULL input or call avresample_read().
|
|
*
|
|
* @see avresample_available()
|
|
* @see avresample_read()
|
|
* @see avresample_get_delay()
|
|
*
|
|
* @param avr audio resample context
|
|
* @param output output data pointers
|
|
* @param out_plane_size output plane size, in bytes.
|
|
* This can be 0 if unknown, but that will lead to
|
|
* optimized functions not being used directly on the
|
|
* output, which could slow down some conversions.
|
|
* @param out_samples maximum number of samples that the output buffer can hold
|
|
* @param input input data pointers
|
|
* @param in_plane_size input plane size, in bytes
|
|
* This can be 0 if unknown, but that will lead to
|
|
* optimized functions not being used directly on the
|
|
* input, which could slow down some conversions.
|
|
* @param in_samples number of input samples to convert
|
|
* @return number of samples written to the output buffer,
|
|
* not including converted samples added to the internal
|
|
* output FIFO
|
|
*/
|
|
int avresample_convert(AVAudioResampleContext *avr, void **output,
|
|
int out_plane_size, int out_samples, void **input,
|
|
int in_plane_size, int in_samples);
|
|
|
|
/**
|
|
* Return the number of samples currently in the resampling delay buffer.
|
|
*
|
|
* When resampling, there may be a delay between the input and output. Any
|
|
* unconverted samples in each call are stored internally in a delay buffer.
|
|
* This function allows the user to determine the current number of samples in
|
|
* the delay buffer, which can be useful for synchronization.
|
|
*
|
|
* @see avresample_convert()
|
|
*
|
|
* @param avr audio resample context
|
|
* @return number of samples currently in the resampling delay buffer
|
|
*/
|
|
int avresample_get_delay(AVAudioResampleContext *avr);
|
|
|
|
/**
|
|
* Return the number of available samples in the output FIFO.
|
|
*
|
|
* During conversion, if the user does not specify an output buffer or
|
|
* specifies an output buffer that is smaller than what is needed, remaining
|
|
* samples that are not written to the output are stored to an internal FIFO
|
|
* buffer. The samples in the FIFO can be read with avresample_read() or
|
|
* avresample_convert().
|
|
*
|
|
* @see avresample_read()
|
|
* @see avresample_convert()
|
|
*
|
|
* @param avr audio resample context
|
|
* @return number of samples available for reading
|
|
*/
|
|
int avresample_available(AVAudioResampleContext *avr);
|
|
|
|
/**
|
|
* Read samples from the output FIFO.
|
|
*
|
|
* During conversion, if the user does not specify an output buffer or
|
|
* specifies an output buffer that is smaller than what is needed, remaining
|
|
* samples that are not written to the output are stored to an internal FIFO
|
|
* buffer. This function can be used to read samples from that internal FIFO.
|
|
*
|
|
* @see avresample_available()
|
|
* @see avresample_convert()
|
|
*
|
|
* @param avr audio resample context
|
|
* @param output output data pointers. May be NULL, in which case
|
|
* nb_samples of data is discarded from output FIFO.
|
|
* @param nb_samples number of samples to read from the FIFO
|
|
* @return the number of samples written to output
|
|
*/
|
|
int avresample_read(AVAudioResampleContext *avr, void **output, int nb_samples);
|
|
|
|
#endif /* AVRESAMPLE_AVRESAMPLE_H */
|