#include <string.h>
#include "libavutil/attributes.h"
#include "libavutil/reverse.h"
#include "libavutil/thread.h"
#include "dsd2pcm.h"

Macros
#define	DSD_CTABLES ((DSD_HTAPS + 7) / 8) /** number of "8 MACs" lookup tables */

Functions
static av_cold void	dsd2pcm_ctables_tableinit (void)

av_cold void	swri_dsd2pcm_init (void)

void	swri_dsd2pcm_translate (DSDContext s, size_t samples, const uint8_t src, ptrdiff_t src_stride, float *dst, ptrdiff_t dst_stride)
	Convert one channel of MSB-first DSD data (one byte = 8 samples) to float PCM at 1/8th of the DSD bit rate.

Variables
static const double	htaps [DSD_HTAPS]
	The 2nd half (48 coeffs) of a 96-tap symmetric lowpass filter.

static double	ctables [DSD_CTABLES][256]

Macro Definition Documentation

◆ DSD_CTABLES

#define DSD_CTABLES ((DSD_HTAPS + 7) / 8) /** number of "8 MACs" lookup tables */

Definition at line 30 of file dsd2pcm.c.

Referenced by dsd2pcm_ctables_tableinit(), and swri_dsd2pcm_translate().

Function Documentation

◆ dsd2pcm_ctables_tableinit()

static av_cold void dsd2pcm_ctables_tableinit ( void )

static

Definition at line 73 of file dsd2pcm.c.

Referenced by swri_dsd2pcm_init().

◆ swri_dsd2pcm_init()

av_cold void swri_dsd2pcm_init ( void )

Definition at line 89 of file dsd2pcm.c.

◆ swri_dsd2pcm_translate()

void swri_dsd2pcm_translate	(	DSDContext *	s,
		size_t	samples,
		const uint8_t *	src,
		ptrdiff_t	src_stride,
		float *	dst,
		ptrdiff_t	dst_stride )

Convert one channel of MSB-first DSD data (one byte = 8 samples) to float PCM at 1/8th of the DSD bit rate.

Strides are in elements.

Definition at line 95 of file dsd2pcm.c.

Variable Documentation

◆ htaps

const double htaps[DSD_HTAPS]

static

Initial value:

= {
     0.09950731974056658,    0.09562845727714668,    0.08819647126516944,
     0.07782552527068175,    0.06534876523171299,    0.05172629311427257,
     0.0379429484910187,     0.02490921351762261,    0.0133774746265897,
     0.003883043418804416,  -0.003284703416210726,  -0.008080250212687497,
    -0.01067241812471033,   -0.01139427235000863,   -0.0106813877974587,
    -0.009007905078766049,  -0.006828859761015335,  -0.004535184322001496,
    -0.002425035959059578,  -0.0006922187080790708,  0.0005700762133516592,
     0.001353838005269448,   0.001713709169690937,   0.001742046839472948,
     0.001545601648013235,   0.001226696225277855,   0.0008704322683580222,
     0.0005381636200535649,  0.000266446345425276,   7.002968738383528e-05,
    -5.279407053811266e-05, -0.0001140625650874684, -0.0001304796361231895,
    -0.0001189970287491285, -9.396247155265073e-05, -6.577634378272832e-05,
    -4.07492895872535e-05,  -2.17407957554587e-05,  -9.163058931391722e-06,
    -2.017460145032201e-06,  1.249721855219005e-06,  2.166655190537392e-06,
     1.930520892991082e-06,  1.319400334374195e-06,  7.410039764949091e-07,
     3.423230509967409e-07,  1.244182214744588e-07,  3.130441005359396e-08
}