mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-09-08 13:18:52 +00:00
Original commit message from CVS: * gst/audioconvert/audioconvert.h: * gst/audioconvert/gstaudioquantize.c: (gst_audio_quantize_setup_dither), (gst_audio_quantize_free_dither): * gst/audioconvert/gstfastrandom.h: Implement a linear congruential generator as pseudo random number generator for the dither noise. This is about 2 times faster than using GLib's mersenne twister. Also this uses only integer math for generating integers while GLib internally uses floating point math.
503 lines
22 KiB
C
503 lines
22 KiB
C
/* GStreamer
|
|
* Copyright (C) 2007 Sebastian Dröge <slomo@circular-chaos.org>
|
|
*
|
|
* gstaudioquantize.c: quantizes audio to the target format and optionally
|
|
* applies dithering and noise shaping.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Library General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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
|
|
* Library General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Library General Public
|
|
* License along with this library; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
/*
|
|
* FIXME: When doing dithering with int as intermediate format
|
|
* one gets audible harmonics while the noise floor is
|
|
* constant for double as intermediate format!
|
|
*/
|
|
|
|
/* TODO: - Maybe drop 5-pole noise shaping and use coefficients
|
|
* generated by dmaker
|
|
* http://shibatch.sf.net
|
|
*/
|
|
|
|
#include <gst/gst.h>
|
|
#include <string.h>
|
|
#include <math.h>
|
|
#include "audioconvert.h"
|
|
#include "gstaudioquantize.h"
|
|
|
|
#include "gstfastrandom.h"
|
|
|
|
#define MAKE_QUANTIZE_FUNC_NAME(name) \
|
|
gst_audio_quantize_quantize_##name
|
|
|
|
/* Quantize functions for gint32 as intermediate format */
|
|
|
|
#define MAKE_QUANTIZE_FUNC_I(name, DITHER_INIT_FUNC, ADD_DITHER_FUNC, \
|
|
ROUND_FUNC) \
|
|
static void \
|
|
MAKE_QUANTIZE_FUNC_NAME (name) (AudioConvertCtx *ctx, gint32 *src, \
|
|
gint32 *dst, gint count) \
|
|
{ \
|
|
gint scale = ctx->out_scale; \
|
|
gint channels = ctx->out.channels; \
|
|
gint chan_pos; \
|
|
\
|
|
if (scale > 0) { \
|
|
gint32 tmp; \
|
|
guint32 mask = 0xffffffff & (0xffffffff << scale); \
|
|
guint32 bias = 1U << (scale - 1); \
|
|
DITHER_INIT_FUNC() \
|
|
\
|
|
for (;count;count--) { \
|
|
for (chan_pos = 0; chan_pos < channels; chan_pos++) { \
|
|
tmp = *src++; \
|
|
ADD_DITHER_FUNC() \
|
|
ROUND_FUNC() \
|
|
*dst = tmp & mask; \
|
|
dst++; \
|
|
} \
|
|
} \
|
|
} else { \
|
|
for (;count;count--) { \
|
|
for (chan_pos = 0; chan_pos < channels; chan_pos++) { \
|
|
*dst = *src++; \
|
|
dst++; \
|
|
} \
|
|
} \
|
|
} \
|
|
}
|
|
|
|
|
|
/* Quantize functions for gdouble as intermediate format with
|
|
* int as target */
|
|
|
|
#define MAKE_QUANTIZE_FUNC_F(name, DITHER_INIT_FUNC, NS_INIT_FUNC, \
|
|
ADD_NS_FUNC, ADD_DITHER_FUNC, \
|
|
UPDATE_ERROR_FUNC) \
|
|
static void \
|
|
MAKE_QUANTIZE_FUNC_NAME (name) (AudioConvertCtx *ctx, gdouble *src, \
|
|
gdouble *dst, gint count) \
|
|
{ \
|
|
gint scale = ctx->out_scale; \
|
|
gint channels = ctx->out.channels; \
|
|
gint chan_pos; \
|
|
gdouble factor = (1U<<(32-scale-1)) - 1; \
|
|
\
|
|
if (scale > 0) { \
|
|
gdouble tmp; \
|
|
DITHER_INIT_FUNC() \
|
|
NS_INIT_FUNC() \
|
|
\
|
|
for (;count;count--) { \
|
|
for (chan_pos = 0; chan_pos < channels; chan_pos++) { \
|
|
tmp = *src++; \
|
|
ADD_NS_FUNC() \
|
|
ADD_DITHER_FUNC() \
|
|
tmp = floor(tmp * factor + 0.5); \
|
|
*dst = CLAMP (tmp, -factor - 1, factor); \
|
|
UPDATE_ERROR_FUNC() \
|
|
dst++; \
|
|
} \
|
|
} \
|
|
} else { \
|
|
for (;count;count--) { \
|
|
for (chan_pos = 0; chan_pos < channels; chan_pos++) { \
|
|
*dst = *src++ * 2147483647.0; \
|
|
dst++; \
|
|
} \
|
|
} \
|
|
} \
|
|
}
|
|
|
|
/* Rounding functions for int as intermediate format, only used when
|
|
* not using dithering. With dithering we include this offset in our
|
|
* dither noise instead. */
|
|
|
|
#define ROUND() \
|
|
if (tmp > 0 && G_MAXINT32 - tmp <= bias) \
|
|
tmp = G_MAXINT32; \
|
|
else \
|
|
tmp += bias;
|
|
|
|
|
|
#define NONE_FUNC()
|
|
|
|
/* Dithering definitions
|
|
* See http://en.wikipedia.org/wiki/Dithering or
|
|
* http://www.cadenzarecording.com/Dither.html for explainations.
|
|
*
|
|
* We already add the rounding offset to the dither noise here
|
|
* to have only one overflow check instead of two. */
|
|
|
|
#define INIT_DITHER_RPDF_I() \
|
|
gint32 rand; \
|
|
gint32 dither = (1<<(scale));
|
|
|
|
#define ADD_DITHER_RPDF_I() \
|
|
rand = gst_fast_random_int32_range (bias - dither, \
|
|
bias + dither); \
|
|
if (rand > 0 && tmp > 0 && G_MAXINT32 - tmp <= rand) \
|
|
tmp = G_MAXINT32; \
|
|
else if (rand < 0 && tmp < 0 && G_MININT32 - tmp >= rand) \
|
|
tmp = G_MININT32; \
|
|
else \
|
|
tmp += rand;
|
|
|
|
#define INIT_DITHER_RPDF_F() \
|
|
gdouble dither = 1.0/(1U<<(32 - scale - 1));
|
|
|
|
#define ADD_DITHER_RPDF_F() \
|
|
tmp += gst_fast_random_double_range (- dither, dither);
|
|
|
|
#define INIT_DITHER_TPDF_I() \
|
|
gint32 rand; \
|
|
gint32 dither = (1<<(scale - 1)); \
|
|
bias = bias >> 1;
|
|
|
|
#define ADD_DITHER_TPDF_I() \
|
|
rand = gst_fast_random_int32_range (bias - dither, \
|
|
bias + dither - 1) \
|
|
+ gst_fast_random_int32_range (bias - dither, \
|
|
bias + dither - 1); \
|
|
if (rand > 0 && tmp > 0 && G_MAXINT32 - tmp <= rand) \
|
|
tmp = G_MAXINT32; \
|
|
else if (rand < 0 && tmp < 0 && G_MININT32 - tmp >= rand) \
|
|
tmp = G_MININT32; \
|
|
else \
|
|
tmp += rand;
|
|
|
|
#define INIT_DITHER_TPDF_F() \
|
|
gdouble dither = 1.0/(1U<<(32 - scale));
|
|
|
|
#define ADD_DITHER_TPDF_F() \
|
|
tmp += gst_fast_random_double_range (- dither, dither) \
|
|
+ gst_fast_random_double_range (- dither, dither);
|
|
|
|
#define INIT_DITHER_TPDF_HF_I() \
|
|
gint32 rand; \
|
|
gint32 dither = (1<<(scale-1)); \
|
|
gint32 *last_random = (gint32 *) ctx->last_random, tmp_rand; \
|
|
bias = bias >> 1;
|
|
|
|
#define ADD_DITHER_TPDF_HF_I() \
|
|
tmp_rand = gst_fast_random_int32_range (bias - dither, \
|
|
bias + dither); \
|
|
rand = tmp_rand - last_random[chan_pos]; \
|
|
last_random[chan_pos] = tmp_rand; \
|
|
if (rand > 0 && tmp > 0 && G_MAXINT32 - tmp <= rand) \
|
|
tmp = G_MAXINT32; \
|
|
else if (rand < 0 && tmp < 0 && G_MININT32 - tmp >= rand) \
|
|
tmp = G_MININT32; \
|
|
else \
|
|
tmp += rand;
|
|
|
|
/* Like TPDF dither but the dither noise is oriented more to the
|
|
* higher frequencies */
|
|
|
|
#define INIT_DITHER_TPDF_HF_F() \
|
|
gdouble rand; \
|
|
gdouble dither = 1.0/(1U<<(32 - scale)); \
|
|
gdouble *last_random = (gdouble *) ctx->last_random, tmp_rand;
|
|
|
|
#define ADD_DITHER_TPDF_HF_F() \
|
|
tmp_rand = gst_fast_random_double_range (- dither, dither); \
|
|
rand = tmp_rand - last_random[chan_pos]; \
|
|
last_random[chan_pos] = tmp_rand; \
|
|
tmp += rand;
|
|
|
|
/* Noise shaping definitions.
|
|
* See http://en.wikipedia.org/wiki/Noise_shaping for explanations. */
|
|
|
|
|
|
/* Simple error feedback: Just accumulate the dithering and quantization
|
|
* error and remove it from each sample. */
|
|
|
|
#define INIT_NS_ERROR_FEEDBACK() \
|
|
gdouble orig; \
|
|
gdouble *errors = ctx->error_buf;
|
|
|
|
#define ADD_NS_ERROR_FEEDBACK() \
|
|
orig = tmp; \
|
|
tmp -= errors[chan_pos];
|
|
|
|
#define UPDATE_ERROR_ERROR_FEEDBACK() \
|
|
errors[chan_pos] += (*dst)/factor - orig;
|
|
|
|
/* Same as error feedback but also add 1/2 of the previous error value.
|
|
* This moves the noise a bit more into the higher frequencies. */
|
|
|
|
#define INIT_NS_SIMPLE() \
|
|
gdouble orig; \
|
|
gdouble *errors = ctx->error_buf, cur_error;
|
|
|
|
#define ADD_NS_SIMPLE() \
|
|
cur_error = errors[chan_pos*2] - 0.5 * errors[chan_pos*2 + 1]; \
|
|
tmp -= cur_error; \
|
|
orig = tmp;
|
|
|
|
#define UPDATE_ERROR_SIMPLE() \
|
|
errors[chan_pos*2 + 1] = errors[chan_pos*2]; \
|
|
errors[chan_pos*2] = (*dst)/factor - orig;
|
|
|
|
|
|
/* Noise shaping coefficients from[1], moves most power of the
|
|
* error noise into inaudible frequency ranges.
|
|
*
|
|
* [1]
|
|
* "Minimally Audible Noise Shaping", Stanley P. Lipshitz,
|
|
* John Vanderkooy, and Robert A. Wannamaker,
|
|
* J. Audio Eng. Soc., Vol. 39, No. 11, November 1991. */
|
|
|
|
static const gdouble ns_medium_coeffs[] = {
|
|
2.033, -2.165, 1.959, -1.590, 0.6149
|
|
};
|
|
|
|
#define INIT_NS_MEDIUM() \
|
|
gdouble orig; \
|
|
gdouble *errors = ctx->error_buf, cur_error; \
|
|
int j;
|
|
|
|
#define ADD_NS_MEDIUM() \
|
|
cur_error = 0.0; \
|
|
for (j = 0; j < 5; j++) \
|
|
cur_error += errors[chan_pos*5 + j] * ns_medium_coeffs[j]; \
|
|
tmp -= cur_error; \
|
|
orig = tmp;
|
|
|
|
#define UPDATE_ERROR_MEDIUM() \
|
|
for (j = 4; j > 0; j--) \
|
|
errors[chan_pos*5 + j] = errors[chan_pos*5 + j-1]; \
|
|
errors[chan_pos*5] = (*dst)/factor - orig;
|
|
|
|
/* Noise shaping coefficients by David Schleef, moves most power of the
|
|
* error noise into inaudible frequency ranges */
|
|
|
|
static const gdouble ns_high_coeffs[] = {
|
|
2.08484, -2.92975, 3.27918, -3.31399, 2.61339, -1.72008, 0.876066, -0.340122
|
|
};
|
|
|
|
#define INIT_NS_HIGH() \
|
|
gdouble orig; \
|
|
gdouble *errors = ctx->error_buf, cur_error; \
|
|
int j;
|
|
|
|
#define ADD_NS_HIGH() \
|
|
cur_error = 0.0; \
|
|
for (j = 0; j < 8; j++) \
|
|
cur_error += errors[chan_pos + j] * ns_high_coeffs[j]; \
|
|
tmp -= cur_error; \
|
|
orig = tmp;
|
|
|
|
#define UPDATE_ERROR_HIGH() \
|
|
for (j = 7; j > 0; j--) \
|
|
errors[chan_pos + j] = errors[chan_pos + j-1]; \
|
|
errors[chan_pos] = (*dst)/factor - orig;
|
|
|
|
|
|
MAKE_QUANTIZE_FUNC_I (signed_none_none, NONE_FUNC, NONE_FUNC, ROUND);
|
|
MAKE_QUANTIZE_FUNC_I (signed_rpdf_none, INIT_DITHER_RPDF_I, ADD_DITHER_RPDF_I,
|
|
NONE_FUNC);
|
|
MAKE_QUANTIZE_FUNC_I (signed_tpdf_none, INIT_DITHER_TPDF_I, ADD_DITHER_TPDF_I,
|
|
NONE_FUNC);
|
|
MAKE_QUANTIZE_FUNC_I (signed_tpdf_hf_none, INIT_DITHER_TPDF_HF_I,
|
|
ADD_DITHER_TPDF_HF_I, NONE_FUNC);
|
|
|
|
MAKE_QUANTIZE_FUNC_I (unsigned_none_none, NONE_FUNC, NONE_FUNC, ROUND);
|
|
MAKE_QUANTIZE_FUNC_I (unsigned_rpdf_none, INIT_DITHER_RPDF_I, ADD_DITHER_RPDF_I,
|
|
NONE_FUNC);
|
|
MAKE_QUANTIZE_FUNC_I (unsigned_tpdf_none, INIT_DITHER_TPDF_I, ADD_DITHER_TPDF_I,
|
|
NONE_FUNC);
|
|
MAKE_QUANTIZE_FUNC_I (unsigned_tpdf_hf_none, INIT_DITHER_TPDF_HF_I,
|
|
ADD_DITHER_TPDF_HF_I, NONE_FUNC);
|
|
|
|
MAKE_QUANTIZE_FUNC_F (float_none_error_feedback, NONE_FUNC,
|
|
INIT_NS_ERROR_FEEDBACK, ADD_NS_ERROR_FEEDBACK, NONE_FUNC,
|
|
UPDATE_ERROR_ERROR_FEEDBACK);
|
|
MAKE_QUANTIZE_FUNC_F (float_none_simple, NONE_FUNC, INIT_NS_SIMPLE,
|
|
ADD_NS_SIMPLE, NONE_FUNC, UPDATE_ERROR_SIMPLE);
|
|
MAKE_QUANTIZE_FUNC_F (float_none_medium, NONE_FUNC, INIT_NS_MEDIUM,
|
|
ADD_NS_MEDIUM, NONE_FUNC, UPDATE_ERROR_MEDIUM);
|
|
MAKE_QUANTIZE_FUNC_F (float_none_high, NONE_FUNC, INIT_NS_HIGH, ADD_NS_HIGH,
|
|
NONE_FUNC, UPDATE_ERROR_HIGH);
|
|
|
|
MAKE_QUANTIZE_FUNC_F (float_rpdf_error_feedback, INIT_DITHER_RPDF_F,
|
|
INIT_NS_ERROR_FEEDBACK, ADD_NS_ERROR_FEEDBACK, ADD_DITHER_RPDF_F,
|
|
UPDATE_ERROR_ERROR_FEEDBACK);
|
|
MAKE_QUANTIZE_FUNC_F (float_rpdf_simple, INIT_DITHER_RPDF_F, INIT_NS_SIMPLE,
|
|
ADD_NS_SIMPLE, ADD_DITHER_RPDF_F, UPDATE_ERROR_SIMPLE);
|
|
MAKE_QUANTIZE_FUNC_F (float_rpdf_medium, INIT_DITHER_RPDF_F, INIT_NS_MEDIUM,
|
|
ADD_NS_MEDIUM, ADD_DITHER_RPDF_F, UPDATE_ERROR_MEDIUM);
|
|
MAKE_QUANTIZE_FUNC_F (float_rpdf_high, INIT_DITHER_RPDF_F, INIT_NS_HIGH,
|
|
ADD_NS_HIGH, ADD_DITHER_RPDF_F, UPDATE_ERROR_HIGH);
|
|
|
|
MAKE_QUANTIZE_FUNC_F (float_tpdf_error_feedback, INIT_DITHER_TPDF_F,
|
|
INIT_NS_ERROR_FEEDBACK, ADD_NS_ERROR_FEEDBACK, ADD_DITHER_TPDF_F,
|
|
UPDATE_ERROR_ERROR_FEEDBACK);
|
|
MAKE_QUANTIZE_FUNC_F (float_tpdf_simple, INIT_DITHER_TPDF_F, INIT_NS_SIMPLE,
|
|
ADD_NS_SIMPLE, ADD_DITHER_TPDF_F, UPDATE_ERROR_SIMPLE);
|
|
MAKE_QUANTIZE_FUNC_F (float_tpdf_medium, INIT_DITHER_TPDF_F, INIT_NS_MEDIUM,
|
|
ADD_NS_MEDIUM, ADD_DITHER_TPDF_F, UPDATE_ERROR_MEDIUM);
|
|
MAKE_QUANTIZE_FUNC_F (float_tpdf_high, INIT_DITHER_TPDF_F, INIT_NS_HIGH,
|
|
ADD_NS_HIGH, ADD_DITHER_TPDF_F, UPDATE_ERROR_HIGH);
|
|
|
|
MAKE_QUANTIZE_FUNC_F (float_tpdf_hf_error_feedback, INIT_DITHER_TPDF_HF_F,
|
|
INIT_NS_ERROR_FEEDBACK, ADD_NS_ERROR_FEEDBACK, ADD_DITHER_TPDF_HF_F,
|
|
UPDATE_ERROR_ERROR_FEEDBACK);
|
|
MAKE_QUANTIZE_FUNC_F (float_tpdf_hf_simple, INIT_DITHER_TPDF_HF_F,
|
|
INIT_NS_SIMPLE, ADD_NS_SIMPLE, ADD_DITHER_TPDF_HF_F, UPDATE_ERROR_SIMPLE);
|
|
MAKE_QUANTIZE_FUNC_F (float_tpdf_hf_medium, INIT_DITHER_TPDF_HF_F,
|
|
INIT_NS_MEDIUM, ADD_NS_MEDIUM, ADD_DITHER_TPDF_HF_F, UPDATE_ERROR_MEDIUM);
|
|
MAKE_QUANTIZE_FUNC_F (float_tpdf_hf_high, INIT_DITHER_TPDF_HF_F, INIT_NS_HIGH,
|
|
ADD_NS_HIGH, ADD_DITHER_TPDF_HF_F, UPDATE_ERROR_HIGH);
|
|
|
|
static AudioConvertQuantize quantize_funcs[] = {
|
|
(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (signed_none_none),
|
|
(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (signed_rpdf_none),
|
|
(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (signed_tpdf_none),
|
|
(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (signed_tpdf_hf_none),
|
|
(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (unsigned_none_none),
|
|
(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (unsigned_rpdf_none),
|
|
(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (unsigned_tpdf_none),
|
|
(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (unsigned_tpdf_hf_none),
|
|
(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_none_error_feedback),
|
|
(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_none_simple),
|
|
(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_none_medium),
|
|
(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_none_high),
|
|
(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_rpdf_error_feedback),
|
|
(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_rpdf_simple),
|
|
(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_rpdf_medium),
|
|
(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_rpdf_high),
|
|
(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_tpdf_error_feedback),
|
|
(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_tpdf_simple),
|
|
(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_tpdf_medium),
|
|
(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_tpdf_high),
|
|
(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_tpdf_hf_error_feedback),
|
|
(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_tpdf_hf_simple),
|
|
(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_tpdf_hf_medium),
|
|
(AudioConvertQuantize) MAKE_QUANTIZE_FUNC_NAME (float_tpdf_hf_high)
|
|
};
|
|
|
|
static void
|
|
gst_audio_quantize_setup_noise_shaping (AudioConvertCtx * ctx)
|
|
{
|
|
switch (ctx->ns) {
|
|
case NOISE_SHAPING_HIGH:{
|
|
ctx->error_buf = g_new0 (gdouble, ctx->out.channels * 8);
|
|
break;
|
|
}
|
|
case NOISE_SHAPING_MEDIUM:{
|
|
ctx->error_buf = g_new0 (gdouble, ctx->out.channels * 5);
|
|
break;
|
|
}
|
|
case NOISE_SHAPING_SIMPLE:{
|
|
ctx->error_buf = g_new0 (gdouble, ctx->out.channels * 2);
|
|
break;
|
|
}
|
|
case NOISE_SHAPING_ERROR_FEEDBACK:
|
|
ctx->error_buf = g_new0 (gdouble, ctx->out.channels);
|
|
break;
|
|
case NOISE_SHAPING_NONE:
|
|
default:
|
|
ctx->error_buf = NULL;
|
|
break;
|
|
}
|
|
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 (ctx->out.is_int)
|
|
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 (!ctx->out.is_int) {
|
|
ctx->quantize = NULL;
|
|
return;
|
|
}
|
|
|
|
if (ctx->ns == NOISE_SHAPING_NONE) {
|
|
index += ctx->dither;
|
|
index += (ctx->out.sign) ? 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);
|
|
}
|