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503 lines
22 KiB
C
503 lines
22 KiB
C
/* GStreamer
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* Copyright (C) 2007 Sebastian Dröge <slomo@circular-chaos.org>
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*
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* gstaudioquantize.c: quantizes audio to the target format and optionally
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* applies dithering and noise shaping.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/*
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* FIXME: When doing dithering with int as intermediate format
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* one gets audible harmonics while the noise floor is
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* constant for double as intermediate format!
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*/
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/* TODO: - Maybe drop 5-pole noise shaping and use coefficients
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* generated by dmaker
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* http://shibatch.sf.net
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*/
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#include <gst/gst.h>
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#include <string.h>
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#include <math.h>
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#include "audioconvert.h"
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#include "gstaudioquantize.h"
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#include "gstfastrandom.h"
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#define MAKE_QUANTIZE_FUNC_NAME(name) \
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gst_audio_quantize_quantize_##name
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/* Quantize functions for gint32 as intermediate format */
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#define MAKE_QUANTIZE_FUNC_I(name, DITHER_INIT_FUNC, ADD_DITHER_FUNC, \
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ROUND_FUNC) \
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static void \
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MAKE_QUANTIZE_FUNC_NAME (name) (AudioConvertCtx *ctx, gint32 *src, \
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gint32 *dst, gint count) \
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{ \
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gint scale = ctx->out_scale; \
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gint channels = ctx->out.channels; \
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gint chan_pos; \
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\
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if (scale > 0) { \
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gint32 tmp; \
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guint32 mask = 0xffffffff & (0xffffffff << scale); \
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guint32 bias = 1U << (scale - 1); \
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DITHER_INIT_FUNC() \
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\
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for (;count;count--) { \
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for (chan_pos = 0; chan_pos < channels; chan_pos++) { \
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tmp = *src++; \
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ADD_DITHER_FUNC() \
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ROUND_FUNC() \
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*dst = tmp & mask; \
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dst++; \
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} \
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} \
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} else { \
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for (;count;count--) { \
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for (chan_pos = 0; chan_pos < channels; chan_pos++) { \
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*dst = *src++; \
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dst++; \
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} \
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} \
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} \
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}
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/* Quantize functions for gdouble as intermediate format with
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* int as target */
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#define MAKE_QUANTIZE_FUNC_F(name, DITHER_INIT_FUNC, NS_INIT_FUNC, \
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ADD_NS_FUNC, ADD_DITHER_FUNC, \
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UPDATE_ERROR_FUNC) \
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static void \
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MAKE_QUANTIZE_FUNC_NAME (name) (AudioConvertCtx *ctx, gdouble *src, \
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gdouble *dst, gint count) \
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{ \
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gint scale = ctx->out_scale; \
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gint channels = ctx->out.channels; \
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gint chan_pos; \
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gdouble factor = (1U<<(32-scale-1)) - 1; \
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\
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if (scale > 0) { \
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gdouble tmp; \
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DITHER_INIT_FUNC() \
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NS_INIT_FUNC() \
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\
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for (;count;count--) { \
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for (chan_pos = 0; chan_pos < channels; chan_pos++) { \
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tmp = *src++; \
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ADD_NS_FUNC() \
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ADD_DITHER_FUNC() \
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tmp = floor(tmp * factor + 0.5); \
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*dst = CLAMP (tmp, -factor - 1, factor); \
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UPDATE_ERROR_FUNC() \
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dst++; \
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} \
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} \
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} else { \
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for (;count;count--) { \
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for (chan_pos = 0; chan_pos < channels; chan_pos++) { \
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*dst = *src++ * 2147483647.0; \
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dst++; \
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} \
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} \
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} \
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}
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/* Rounding functions for int as intermediate format, only used when
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* not using dithering. With dithering we include this offset in our
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* dither noise instead. */
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#define ROUND() \
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if (tmp > 0 && G_MAXINT32 - tmp <= bias) \
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tmp = G_MAXINT32; \
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else \
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tmp += bias;
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#define NONE_FUNC()
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/* Dithering definitions
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* See http://en.wikipedia.org/wiki/Dithering or
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* http://www.cadenzarecording.com/Dither.html for explainations.
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*
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* We already add the rounding offset to the dither noise here
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* to have only one overflow check instead of two. */
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#define INIT_DITHER_RPDF_I() \
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gint32 rand; \
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gint32 dither = (1<<(scale));
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#define ADD_DITHER_RPDF_I() \
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rand = gst_fast_random_int32_range (bias - dither, \
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bias + dither); \
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if (rand > 0 && tmp > 0 && G_MAXINT32 - tmp <= rand) \
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tmp = G_MAXINT32; \
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else if (rand < 0 && tmp < 0 && G_MININT32 - tmp >= rand) \
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tmp = G_MININT32; \
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else \
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tmp += rand;
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#define INIT_DITHER_RPDF_F() \
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gdouble dither = 1.0/(1U<<(32 - scale - 1));
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#define ADD_DITHER_RPDF_F() \
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tmp += gst_fast_random_double_range (- dither, dither);
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#define INIT_DITHER_TPDF_I() \
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gint32 rand; \
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gint32 dither = (1<<(scale - 1)); \
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bias = bias >> 1;
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#define ADD_DITHER_TPDF_I() \
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rand = gst_fast_random_int32_range (bias - dither, \
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bias + dither - 1) \
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+ gst_fast_random_int32_range (bias - dither, \
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bias + dither - 1); \
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if (rand > 0 && tmp > 0 && G_MAXINT32 - tmp <= rand) \
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tmp = G_MAXINT32; \
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else if (rand < 0 && tmp < 0 && G_MININT32 - tmp >= rand) \
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tmp = G_MININT32; \
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else \
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tmp += rand;
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#define INIT_DITHER_TPDF_F() \
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gdouble dither = 1.0/(1U<<(32 - scale));
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#define ADD_DITHER_TPDF_F() \
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tmp += gst_fast_random_double_range (- dither, dither) \
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+ gst_fast_random_double_range (- dither, dither);
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#define INIT_DITHER_TPDF_HF_I() \
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gint32 rand; \
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gint32 dither = (1<<(scale-1)); \
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gint32 *last_random = (gint32 *) ctx->last_random, tmp_rand; \
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bias = bias >> 1;
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#define ADD_DITHER_TPDF_HF_I() \
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tmp_rand = gst_fast_random_int32_range (bias - dither, \
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bias + dither); \
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rand = tmp_rand - last_random[chan_pos]; \
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last_random[chan_pos] = tmp_rand; \
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if (rand > 0 && tmp > 0 && G_MAXINT32 - tmp <= rand) \
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tmp = G_MAXINT32; \
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else if (rand < 0 && tmp < 0 && G_MININT32 - tmp >= rand) \
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tmp = G_MININT32; \
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else \
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tmp += rand;
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/* Like TPDF dither but the dither noise is oriented more to the
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* higher frequencies */
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#define INIT_DITHER_TPDF_HF_F() \
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gdouble rand; \
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gdouble dither = 1.0/(1U<<(32 - scale)); \
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gdouble *last_random = (gdouble *) ctx->last_random, tmp_rand;
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#define ADD_DITHER_TPDF_HF_F() \
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tmp_rand = gst_fast_random_double_range (- dither, dither); \
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rand = tmp_rand - last_random[chan_pos]; \
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last_random[chan_pos] = tmp_rand; \
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tmp += rand;
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/* Noise shaping definitions.
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* See http://en.wikipedia.org/wiki/Noise_shaping for explanations. */
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/* Simple error feedback: Just accumulate the dithering and quantization
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* error and remove it from each sample. */
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#define INIT_NS_ERROR_FEEDBACK() \
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gdouble orig; \
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gdouble *errors = ctx->error_buf;
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#define ADD_NS_ERROR_FEEDBACK() \
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orig = tmp; \
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tmp -= errors[chan_pos];
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#define UPDATE_ERROR_ERROR_FEEDBACK() \
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errors[chan_pos] += (*dst)/factor - orig;
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/* Same as error feedback but also add 1/2 of the previous error value.
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* This moves the noise a bit more into the higher frequencies. */
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#define INIT_NS_SIMPLE() \
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gdouble orig; \
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gdouble *errors = ctx->error_buf, cur_error;
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#define ADD_NS_SIMPLE() \
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cur_error = errors[chan_pos*2] - 0.5 * errors[chan_pos*2 + 1]; \
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tmp -= cur_error; \
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orig = tmp;
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#define UPDATE_ERROR_SIMPLE() \
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errors[chan_pos*2 + 1] = errors[chan_pos*2]; \
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errors[chan_pos*2] = (*dst)/factor - orig;
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/* Noise shaping coefficients from[1], moves most power of the
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* error noise into inaudible frequency ranges.
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*
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* [1]
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* "Minimally Audible Noise Shaping", Stanley P. Lipshitz,
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* John Vanderkooy, and Robert A. Wannamaker,
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* J. Audio Eng. Soc., Vol. 39, No. 11, November 1991. */
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static const gdouble ns_medium_coeffs[] = {
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2.033, -2.165, 1.959, -1.590, 0.6149
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};
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#define INIT_NS_MEDIUM() \
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gdouble orig; \
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gdouble *errors = ctx->error_buf, cur_error; \
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int j;
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#define ADD_NS_MEDIUM() \
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cur_error = 0.0; \
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for (j = 0; j < 5; j++) \
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cur_error += errors[chan_pos*5 + j] * ns_medium_coeffs[j]; \
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tmp -= cur_error; \
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orig = tmp;
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#define UPDATE_ERROR_MEDIUM() \
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for (j = 4; j > 0; j--) \
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errors[chan_pos*5 + j] = errors[chan_pos*5 + j-1]; \
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errors[chan_pos*5] = (*dst)/factor - orig;
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/* Noise shaping coefficients by David Schleef, moves most power of the
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* error noise into inaudible frequency ranges */
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static const gdouble ns_high_coeffs[] = {
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2.08484, -2.92975, 3.27918, -3.31399, 2.61339, -1.72008, 0.876066, -0.340122
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};
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#define INIT_NS_HIGH() \
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gdouble orig; \
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gdouble *errors = ctx->error_buf, cur_error; \
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int j;
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#define ADD_NS_HIGH() \
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cur_error = 0.0; \
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for (j = 0; j < 8; j++) \
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cur_error += errors[chan_pos + j] * ns_high_coeffs[j]; \
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tmp -= cur_error; \
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orig = tmp;
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#define UPDATE_ERROR_HIGH() \
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for (j = 7; j > 0; j--) \
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errors[chan_pos + j] = errors[chan_pos + j-1]; \
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errors[chan_pos] = (*dst)/factor - orig;
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MAKE_QUANTIZE_FUNC_I (signed_none_none, NONE_FUNC, NONE_FUNC, ROUND);
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MAKE_QUANTIZE_FUNC_I (signed_rpdf_none, INIT_DITHER_RPDF_I, ADD_DITHER_RPDF_I,
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NONE_FUNC);
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MAKE_QUANTIZE_FUNC_I (signed_tpdf_none, INIT_DITHER_TPDF_I, ADD_DITHER_TPDF_I,
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NONE_FUNC);
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MAKE_QUANTIZE_FUNC_I (signed_tpdf_hf_none, INIT_DITHER_TPDF_HF_I,
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ADD_DITHER_TPDF_HF_I, NONE_FUNC);
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MAKE_QUANTIZE_FUNC_I (unsigned_none_none, NONE_FUNC, NONE_FUNC, ROUND);
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MAKE_QUANTIZE_FUNC_I (unsigned_rpdf_none, INIT_DITHER_RPDF_I, ADD_DITHER_RPDF_I,
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NONE_FUNC);
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MAKE_QUANTIZE_FUNC_I (unsigned_tpdf_none, INIT_DITHER_TPDF_I, ADD_DITHER_TPDF_I,
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NONE_FUNC);
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MAKE_QUANTIZE_FUNC_I (unsigned_tpdf_hf_none, INIT_DITHER_TPDF_HF_I,
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ADD_DITHER_TPDF_HF_I, NONE_FUNC);
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MAKE_QUANTIZE_FUNC_F (float_none_error_feedback, NONE_FUNC,
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INIT_NS_ERROR_FEEDBACK, ADD_NS_ERROR_FEEDBACK, NONE_FUNC,
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UPDATE_ERROR_ERROR_FEEDBACK);
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MAKE_QUANTIZE_FUNC_F (float_none_simple, NONE_FUNC, INIT_NS_SIMPLE,
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ADD_NS_SIMPLE, NONE_FUNC, UPDATE_ERROR_SIMPLE);
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MAKE_QUANTIZE_FUNC_F (float_none_medium, NONE_FUNC, INIT_NS_MEDIUM,
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ADD_NS_MEDIUM, NONE_FUNC, UPDATE_ERROR_MEDIUM);
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MAKE_QUANTIZE_FUNC_F (float_none_high, NONE_FUNC, INIT_NS_HIGH, ADD_NS_HIGH,
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NONE_FUNC, UPDATE_ERROR_HIGH);
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MAKE_QUANTIZE_FUNC_F (float_rpdf_error_feedback, INIT_DITHER_RPDF_F,
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INIT_NS_ERROR_FEEDBACK, ADD_NS_ERROR_FEEDBACK, ADD_DITHER_RPDF_F,
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UPDATE_ERROR_ERROR_FEEDBACK);
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MAKE_QUANTIZE_FUNC_F (float_rpdf_simple, INIT_DITHER_RPDF_F, INIT_NS_SIMPLE,
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ADD_NS_SIMPLE, ADD_DITHER_RPDF_F, UPDATE_ERROR_SIMPLE);
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MAKE_QUANTIZE_FUNC_F (float_rpdf_medium, INIT_DITHER_RPDF_F, INIT_NS_MEDIUM,
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ADD_NS_MEDIUM, ADD_DITHER_RPDF_F, UPDATE_ERROR_MEDIUM);
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MAKE_QUANTIZE_FUNC_F (float_rpdf_high, INIT_DITHER_RPDF_F, INIT_NS_HIGH,
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ADD_NS_HIGH, ADD_DITHER_RPDF_F, UPDATE_ERROR_HIGH);
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MAKE_QUANTIZE_FUNC_F (float_tpdf_error_feedback, INIT_DITHER_TPDF_F,
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INIT_NS_ERROR_FEEDBACK, ADD_NS_ERROR_FEEDBACK, ADD_DITHER_TPDF_F,
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UPDATE_ERROR_ERROR_FEEDBACK);
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MAKE_QUANTIZE_FUNC_F (float_tpdf_simple, INIT_DITHER_TPDF_F, INIT_NS_SIMPLE,
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ADD_NS_SIMPLE, ADD_DITHER_TPDF_F, UPDATE_ERROR_SIMPLE);
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MAKE_QUANTIZE_FUNC_F (float_tpdf_medium, INIT_DITHER_TPDF_F, INIT_NS_MEDIUM,
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ADD_NS_MEDIUM, ADD_DITHER_TPDF_F, UPDATE_ERROR_MEDIUM);
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MAKE_QUANTIZE_FUNC_F (float_tpdf_high, INIT_DITHER_TPDF_F, INIT_NS_HIGH,
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ADD_NS_HIGH, ADD_DITHER_TPDF_F, UPDATE_ERROR_HIGH);
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MAKE_QUANTIZE_FUNC_F (float_tpdf_hf_error_feedback, INIT_DITHER_TPDF_HF_F,
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INIT_NS_ERROR_FEEDBACK, ADD_NS_ERROR_FEEDBACK, ADD_DITHER_TPDF_HF_F,
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UPDATE_ERROR_ERROR_FEEDBACK);
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MAKE_QUANTIZE_FUNC_F (float_tpdf_hf_simple, INIT_DITHER_TPDF_HF_F,
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INIT_NS_SIMPLE, ADD_NS_SIMPLE, ADD_DITHER_TPDF_HF_F, UPDATE_ERROR_SIMPLE);
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MAKE_QUANTIZE_FUNC_F (float_tpdf_hf_medium, INIT_DITHER_TPDF_HF_F,
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INIT_NS_MEDIUM, ADD_NS_MEDIUM, ADD_DITHER_TPDF_HF_F, UPDATE_ERROR_MEDIUM);
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MAKE_QUANTIZE_FUNC_F (float_tpdf_hf_high, INIT_DITHER_TPDF_HF_F, INIT_NS_HIGH,
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ADD_NS_HIGH, ADD_DITHER_TPDF_HF_F, UPDATE_ERROR_HIGH);
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static AudioConvertQuantize quantize_funcs[] = {
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(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (signed_none_none),
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(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (signed_rpdf_none),
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(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (signed_tpdf_none),
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(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (signed_tpdf_hf_none),
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(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (unsigned_none_none),
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(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (unsigned_rpdf_none),
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(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (unsigned_tpdf_none),
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(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (unsigned_tpdf_hf_none),
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(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_none_error_feedback),
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(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_none_simple),
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(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_none_medium),
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(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_none_high),
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(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_rpdf_error_feedback),
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(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_rpdf_simple),
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(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_rpdf_medium),
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(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_rpdf_high),
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(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_tpdf_error_feedback),
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(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_tpdf_simple),
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(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_tpdf_medium),
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(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_tpdf_high),
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(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_tpdf_hf_error_feedback),
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(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_tpdf_hf_simple),
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(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_tpdf_hf_medium),
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(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_tpdf_hf_high)
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};
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static void
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gst_audio_quantize_setup_noise_shaping (AudioConvertCtx * ctx)
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{
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switch (ctx->ns) {
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case NOISE_SHAPING_HIGH:{
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ctx->error_buf = g_new0 (gdouble, ctx->out.channels * 8);
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break;
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}
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case NOISE_SHAPING_MEDIUM:{
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ctx->error_buf = g_new0 (gdouble, ctx->out.channels * 5);
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break;
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}
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case NOISE_SHAPING_SIMPLE:{
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ctx->error_buf = g_new0 (gdouble, ctx->out.channels * 2);
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break;
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}
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case NOISE_SHAPING_ERROR_FEEDBACK:
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ctx->error_buf = g_new0 (gdouble, ctx->out.channels);
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break;
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case NOISE_SHAPING_NONE:
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default:
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ctx->error_buf = NULL;
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break;
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}
|
|
return;
|
|
}
|
|
|
|
static void
|
|
gst_audio_quantize_free_noise_shaping (AudioConvertCtx * ctx)
|
|
{
|
|
switch (ctx->ns) {
|
|
case NOISE_SHAPING_HIGH:
|
|
case NOISE_SHAPING_MEDIUM:
|
|
case NOISE_SHAPING_SIMPLE:
|
|
case NOISE_SHAPING_ERROR_FEEDBACK:
|
|
case NOISE_SHAPING_NONE:
|
|
default:
|
|
break;
|
|
}
|
|
|
|
g_free (ctx->error_buf);
|
|
ctx->error_buf = NULL;
|
|
return;
|
|
}
|
|
|
|
static void
|
|
gst_audio_quantize_setup_dither (AudioConvertCtx * ctx)
|
|
{
|
|
switch (ctx->dither) {
|
|
case DITHER_TPDF_HF:
|
|
if (GST_AUDIO_FORMAT_INFO_IS_INTEGER (ctx->out.finfo))
|
|
ctx->last_random = g_new0 (gint32, ctx->out.channels);
|
|
else
|
|
ctx->last_random = g_new0 (gdouble, ctx->out.channels);
|
|
break;
|
|
case DITHER_RPDF:
|
|
case DITHER_TPDF:
|
|
ctx->last_random = NULL;
|
|
break;
|
|
case DITHER_NONE:
|
|
default:
|
|
ctx->last_random = NULL;
|
|
break;
|
|
}
|
|
return;
|
|
}
|
|
|
|
static void
|
|
gst_audio_quantize_free_dither (AudioConvertCtx * ctx)
|
|
{
|
|
g_free (ctx->last_random);
|
|
|
|
return;
|
|
}
|
|
|
|
static void
|
|
gst_audio_quantize_setup_quantize_func (AudioConvertCtx * ctx)
|
|
{
|
|
gint index = 0;
|
|
|
|
if (!GST_AUDIO_FORMAT_INFO_IS_INTEGER (ctx->out.finfo)) {
|
|
ctx->quantize = NULL;
|
|
return;
|
|
}
|
|
|
|
if (ctx->ns == NOISE_SHAPING_NONE) {
|
|
index += ctx->dither;
|
|
index += GST_AUDIO_FORMAT_INFO_IS_SIGNED (ctx->out.finfo) ? 0 : 4;
|
|
} else {
|
|
index += 8 + (4 * ctx->dither);
|
|
index += ctx->ns - 1;
|
|
}
|
|
|
|
ctx->quantize = quantize_funcs[index];
|
|
}
|
|
|
|
gboolean
|
|
gst_audio_quantize_setup (AudioConvertCtx * ctx)
|
|
{
|
|
gst_audio_quantize_setup_dither (ctx);
|
|
gst_audio_quantize_setup_noise_shaping (ctx);
|
|
gst_audio_quantize_setup_quantize_func (ctx);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
void
|
|
gst_audio_quantize_free (AudioConvertCtx * ctx)
|
|
{
|
|
gst_audio_quantize_free_dither (ctx);
|
|
gst_audio_quantize_free_noise_shaping (ctx);
|
|
}
|