--- /dev/null
+/* 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);
+}
projects / mafwsubrenderer / blobdiff