* add support for liba52

Originally committed as revision 411 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 655 insertions, 0 deletions

diff --git a/libavcodec/liba52/downmix.c b/libavcodec/liba52/downmix.c
new file mode 100644
index 0000000000..b9ac1fdeaa
--- /dev/null
+++ b/libavcodec/liba52/downmix.c
@@ -0,0 +1,655 @@
+/*
+ * downmix.c
+ * Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
+ * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
+ *
+ * This file is part of a52dec, a free ATSC A-52 stream decoder.
+ * See http://liba52.sourceforge.net/ for updates.
+ *
+ * a52dec is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * a52dec 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "config.h"
+
+#include <string.h>
+#include <inttypes.h>
+
+#include "a52.h"
+#include "a52_internal.h"
+
+#define CONVERT(acmod,output) (((output) << 3) + (acmod))
+
+int a52_downmix_init (int input, int flags, sample_t * level,
+		      sample_t clev, sample_t slev)
+{
+    static uint8_t table[11][8] = {
+	{A52_CHANNEL,	A52_DOLBY,	A52_STEREO,	A52_STEREO,
+	 A52_STEREO,	A52_STEREO,	A52_STEREO,	A52_STEREO},
+	{A52_MONO,	A52_MONO,	A52_MONO,	A52_MONO,
+	 A52_MONO,	A52_MONO,	A52_MONO,	A52_MONO},
+	{A52_CHANNEL,	A52_DOLBY,	A52_STEREO,	A52_STEREO,
+	 A52_STEREO,	A52_STEREO,	A52_STEREO,	A52_STEREO},
+	{A52_CHANNEL,	A52_DOLBY,	A52_STEREO,	A52_3F,
+	 A52_STEREO,	A52_3F,		A52_STEREO,	A52_3F},
+	{A52_CHANNEL,	A52_DOLBY,	A52_STEREO,	A52_STEREO,
+	 A52_2F1R,	A52_2F1R,	A52_2F1R,	A52_2F1R},
+	{A52_CHANNEL,	A52_DOLBY,	A52_STEREO,	A52_STEREO,
+	 A52_2F1R,	A52_3F1R,	A52_2F1R,	A52_3F1R},
+	{A52_CHANNEL,	A52_DOLBY,	A52_STEREO,	A52_3F,
+	 A52_2F2R,	A52_2F2R,	A52_2F2R,	A52_2F2R},
+	{A52_CHANNEL,	A52_DOLBY,	A52_STEREO,	A52_3F,
+	 A52_2F2R,	A52_3F2R,	A52_2F2R,	A52_3F2R},
+	{A52_CHANNEL1,	A52_MONO,	A52_MONO,	A52_MONO,
+	 A52_MONO,	A52_MONO,	A52_MONO,	A52_MONO},
+	{A52_CHANNEL2,	A52_MONO,	A52_MONO,	A52_MONO,
+	 A52_MONO,	A52_MONO,	A52_MONO,	A52_MONO},
+	{A52_CHANNEL,	A52_DOLBY,	A52_STEREO,	A52_DOLBY,
+	 A52_DOLBY,	A52_DOLBY,	A52_DOLBY,	A52_DOLBY}
+    };
+    int output;
+
+    output = flags & A52_CHANNEL_MASK;
+    if (output > A52_DOLBY)
+	return -1;
+
+    output = table[output][input & 7];
+
+    if ((output == A52_STEREO) &&
+	((input == A52_DOLBY) || ((input == A52_3F) && (clev == LEVEL_3DB))))
+	output = A52_DOLBY;
+
+    if (flags & A52_ADJUST_LEVEL)
+	switch (CONVERT (input & 7, output)) {
+
+	case CONVERT (A52_3F, A52_MONO):
+	    *level *= LEVEL_3DB / (1 + clev);
+	    break;
+
+	case CONVERT (A52_STEREO, A52_MONO):
+	case CONVERT (A52_2F2R, A52_2F1R):
+	case CONVERT (A52_3F2R, A52_3F1R):
+	level_3db:
+	    *level *= LEVEL_3DB;
+	    break;
+
+	case CONVERT (A52_3F2R, A52_2F1R):
+	    if (clev < LEVEL_PLUS3DB - 1)
+		goto level_3db;
+	    /* break thru */
+	case CONVERT (A52_3F, A52_STEREO):
+	case CONVERT (A52_3F1R, A52_2F1R):
+	case CONVERT (A52_3F1R, A52_2F2R):
+	case CONVERT (A52_3F2R, A52_2F2R):
+	    *level /= 1 + clev;
+	    break;
+
+	case CONVERT (A52_2F1R, A52_MONO):
+	    *level *= LEVEL_PLUS3DB / (2 + slev);
+	    break;
+
+	case CONVERT (A52_2F1R, A52_STEREO):
+	case CONVERT (A52_3F1R, A52_3F):
+	    *level /= 1 + slev * LEVEL_3DB;
+	    break;
+
+	case CONVERT (A52_3F1R, A52_MONO):
+	    *level *= LEVEL_3DB / (1 + clev + 0.5 * slev);
+	    break;
+
+	case CONVERT (A52_3F1R, A52_STEREO):
+	    *level /= 1 + clev + slev * LEVEL_3DB;
+	    break;
+
+	case CONVERT (A52_2F2R, A52_MONO):
+	    *level *= LEVEL_3DB / (1 + slev);
+	    break;
+
+	case CONVERT (A52_2F2R, A52_STEREO):
+	case CONVERT (A52_3F2R, A52_3F):
+	    *level /= 1 + slev;
+	    break;
+
+	case CONVERT (A52_3F2R, A52_MONO):
+	    *level *= LEVEL_3DB / (1 + clev + slev);
+	    break;
+
+	case CONVERT (A52_3F2R, A52_STEREO):
+	    *level /= 1 + clev + slev;
+	    break;
+
+	case CONVERT (A52_MONO, A52_DOLBY):
+	    *level *= LEVEL_PLUS3DB;
+	    break;
+
+	case CONVERT (A52_3F, A52_DOLBY):
+	case CONVERT (A52_2F1R, A52_DOLBY):
+	    *level *= 1 / (1 + LEVEL_3DB);
+	    break;
+
+	case CONVERT (A52_3F1R, A52_DOLBY):
+	case CONVERT (A52_2F2R, A52_DOLBY):
+	    *level *= 1 / (1 + 2 * LEVEL_3DB);
+	    break;
+
+	case CONVERT (A52_3F2R, A52_DOLBY):
+	    *level *= 1 / (1 + 3 * LEVEL_3DB);
+	    break;
+	}
+
+    return output;
+}
+
+int a52_downmix_coeff (sample_t * coeff, int acmod, int output, sample_t level,
+		       sample_t clev, sample_t slev)
+{
+    switch (CONVERT (acmod, output & A52_CHANNEL_MASK)) {
+
+    case CONVERT (A52_CHANNEL, A52_CHANNEL):
+    case CONVERT (A52_MONO, A52_MONO):
+    case CONVERT (A52_STEREO, A52_STEREO):
+    case CONVERT (A52_3F, A52_3F):
+    case CONVERT (A52_2F1R, A52_2F1R):
+    case CONVERT (A52_3F1R, A52_3F1R):
+    case CONVERT (A52_2F2R, A52_2F2R):
+    case CONVERT (A52_3F2R, A52_3F2R):
+    case CONVERT (A52_STEREO, A52_DOLBY):
+	coeff[0] = coeff[1] = coeff[2] = coeff[3] = coeff[4] = level;
+	return 0;
+
+    case CONVERT (A52_CHANNEL, A52_MONO):
+	coeff[0] = coeff[1] = level * LEVEL_6DB;
+	return 3;
+
+    case CONVERT (A52_STEREO, A52_MONO):
+	coeff[0] = coeff[1] = level * LEVEL_3DB;
+	return 3;
+
+    case CONVERT (A52_3F, A52_MONO):
+	coeff[0] = coeff[2] = level * LEVEL_3DB;
+	coeff[1] = level * clev * LEVEL_PLUS3DB;
+	return 7;
+
+    case CONVERT (A52_2F1R, A52_MONO):
+	coeff[0] = coeff[1] = level * LEVEL_3DB;
+	coeff[2] = level * slev * LEVEL_3DB;
+	return 7;
+
+    case CONVERT (A52_2F2R, A52_MONO):
+	coeff[0] = coeff[1] = level * LEVEL_3DB;
+	coeff[2] = coeff[3] = level * slev * LEVEL_3DB;
+	return 15;
+
+    case CONVERT (A52_3F1R, A52_MONO):
+	coeff[0] = coeff[2] = level * LEVEL_3DB;
+	coeff[1] = level * clev * LEVEL_PLUS3DB;
+	coeff[3] = level * slev * LEVEL_3DB;
+	return 15;
+
+    case CONVERT (A52_3F2R, A52_MONO):
+	coeff[0] = coeff[2] = level * LEVEL_3DB;
+	coeff[1] = level * clev * LEVEL_PLUS3DB;
+	coeff[3] = coeff[4] = level * slev * LEVEL_3DB;
+	return 31;
+
+    case CONVERT (A52_MONO, A52_DOLBY):
+	coeff[0] = level * LEVEL_3DB;
+	return 0;
+
+    case CONVERT (A52_3F, A52_DOLBY):
+	clev = LEVEL_3DB;
+    case CONVERT (A52_3F, A52_STEREO):
+    case CONVERT (A52_3F1R, A52_2F1R):
+    case CONVERT (A52_3F2R, A52_2F2R):
+	coeff[0] = coeff[2] = coeff[3] = coeff[4] = level;
+	coeff[1] = level * clev;
+	return 7;
+
+    case CONVERT (A52_2F1R, A52_DOLBY):
+	slev = 1;
+    case CONVERT (A52_2F1R, A52_STEREO):
+	coeff[0] = coeff[1] = level;
+	coeff[2] = level * slev * LEVEL_3DB;
+	return 7;
+
+    case CONVERT (A52_3F1R, A52_DOLBY):
+	clev = LEVEL_3DB;
+	slev = 1;
+    case CONVERT (A52_3F1R, A52_STEREO):
+	coeff[0] = coeff[2] = level;
+	coeff[1] = level * clev;
+	coeff[3] = level * slev * LEVEL_3DB;
+	return 15;
+
+    case CONVERT (A52_2F2R, A52_DOLBY):
+	slev = LEVEL_3DB;
+    case CONVERT (A52_2F2R, A52_STEREO):
+	coeff[0] = coeff[1] = level;
+	coeff[2] = coeff[3] = level * slev;
+	return 15;
+
+    case CONVERT (A52_3F2R, A52_DOLBY):
+	clev = LEVEL_3DB;
+    case CONVERT (A52_3F2R, A52_2F1R):
+	slev = LEVEL_3DB;
+    case CONVERT (A52_3F2R, A52_STEREO):
+	coeff[0] = coeff[2] = level;
+	coeff[1] = level * clev;
+	coeff[3] = coeff[4] = level * slev;
+	return 31;
+
+    case CONVERT (A52_3F1R, A52_3F):
+	coeff[0] = coeff[1] = coeff[2] = level;
+	coeff[3] = level * slev * LEVEL_3DB;
+	return 13;
+
+    case CONVERT (A52_3F2R, A52_3F):
+	coeff[0] = coeff[1] = coeff[2] = level;
+	coeff[3] = coeff[4] = level * slev;
+	return 29;
+
+    case CONVERT (A52_2F2R, A52_2F1R):
+	coeff[0] = coeff[1] = level;
+	coeff[2] = coeff[3] = level * LEVEL_3DB;
+	return 12;
+
+    case CONVERT (A52_3F2R, A52_3F1R):
+	coeff[0] = coeff[1] = coeff[2] = level;
+	coeff[3] = coeff[4] = level * LEVEL_3DB;
+	return 24;
+
+    case CONVERT (A52_2F1R, A52_2F2R):
+	coeff[0] = coeff[1] = level;
+	coeff[2] = level * LEVEL_3DB;
+	return 0;
+
+    case CONVERT (A52_3F1R, A52_2F2R):
+	coeff[0] = coeff[2] = level;
+	coeff[1] = level * clev;
+	coeff[3] = level * LEVEL_3DB;
+	return 7;
+
+    case CONVERT (A52_3F1R, A52_3F2R):
+	coeff[0] = coeff[1] = coeff[2] = level;
+	coeff[3] = level * LEVEL_3DB;
+	return 0;
+
+    case CONVERT (A52_CHANNEL, A52_CHANNEL1):
+	coeff[0] = level;
+	coeff[1] = 0;
+	return 0;
+
+    case CONVERT (A52_CHANNEL, A52_CHANNEL2):
+	coeff[0] = 0;
+	coeff[1] = level;
+	return 0;
+    }
+
+    return -1;	/* NOTREACHED */
+}
+
+static void mix2to1 (sample_t * dest, sample_t * src, sample_t bias)
+{
+    int i;
+
+    for (i = 0; i < 256; i++)
+	dest[i] += src[i] + bias;
+}
+
+static void mix3to1 (sample_t * samples, sample_t bias)
+{
+    int i;
+
+    for (i = 0; i < 256; i++)
+	samples[i] += samples[i + 256] + samples[i + 512] + bias;
+}
+
+static void mix4to1 (sample_t * samples, sample_t bias)
+{
+    int i;
+
+    for (i = 0; i < 256; i++)
+	samples[i] += (samples[i + 256] + samples[i + 512] +
+		       samples[i + 768] + bias);
+}
+
+static void mix5to1 (sample_t * samples, sample_t bias)
+{
+    int i;
+
+    for (i = 0; i < 256; i++)
+	samples[i] += (samples[i + 256] + samples[i + 512] +
+		       samples[i + 768] + samples[i + 1024] + bias);
+}
+
+static void mix3to2 (sample_t * samples, sample_t bias)
+{
+    int i;
+    sample_t common;
+
+    for (i = 0; i < 256; i++) {
+	common = samples[i + 256] + bias;
+	samples[i] += common;
+	samples[i + 256] = samples[i + 512] + common;
+    }
+}
+
+static void mix21to2 (sample_t * left, sample_t * right, sample_t bias)
+{
+    int i;
+    sample_t common;
+
+    for (i = 0; i < 256; i++) {
+	common = right[i + 256] + bias;
+	left[i] += common;
+	right[i] += common;
+    }
+}
+
+static void mix21toS (sample_t * samples, sample_t bias)
+{
+    int i;
+    sample_t surround;
+
+    for (i = 0; i < 256; i++) {
+	surround = samples[i + 512];
+	samples[i] += bias - surround;
+	samples[i + 256] += bias + surround;
+    }
+}
+
+static void mix31to2 (sample_t * samples, sample_t bias)
+{
+    int i;
+    sample_t common;
+
+    for (i = 0; i < 256; i++) {
+	common = samples[i + 256] + samples[i + 768] + bias;
+	samples[i] += common;
+	samples[i + 256] = samples[i + 512] + common;
+    }
+}
+
+static void mix31toS (sample_t * samples, sample_t bias)
+{
+    int i;
+    sample_t common, surround;
+
+    for (i = 0; i < 256; i++) {
+	common = samples[i + 256] + bias;
+	surround = samples[i + 768];
+	samples[i] += common - surround;
+	samples[i + 256] = samples[i + 512] + common + surround;
+    }
+}
+
+static void mix22toS (sample_t * samples, sample_t bias)
+{
+    int i;
+    sample_t surround;
+
+    for (i = 0; i < 256; i++) {
+	surround = samples[i + 512] + samples[i + 768];
+	samples[i] += bias - surround;
+	samples[i + 256] += bias + surround;
+    }
+}
+
+static void mix32to2 (sample_t * samples, sample_t bias)
+{
+    int i;
+    sample_t common;
+
+    for (i = 0; i < 256; i++) {
+	common = samples[i + 256] + bias;
+	samples[i] += common + samples[i + 768];
+	samples[i + 256] = common + samples[i + 512] + samples[i + 1024];
+    }
+}
+
+static void mix32toS (sample_t * samples, sample_t bias)
+{
+    int i;
+    sample_t common, surround;
+
+    for (i = 0; i < 256; i++) {
+	common = samples[i + 256] + bias;
+	surround = samples[i + 768] + samples[i + 1024];
+	samples[i] += common - surround;
+	samples[i + 256] = samples[i + 512] + common + surround;
+    }
+}
+
+static void move2to1 (sample_t * src, sample_t * dest, sample_t bias)
+{
+    int i;
+
+    for (i = 0; i < 256; i++)
+	dest[i] = src[i] + src[i + 256] + bias;
+}
+
+static void zero (sample_t * samples)
+{
+    int i;
+
+    for (i = 0; i < 256; i++)
+	samples[i] = 0;
+}
+
+void a52_downmix (sample_t * samples, int acmod, int output, sample_t bias,
+		  sample_t clev, sample_t slev)
+{
+    switch (CONVERT (acmod, output & A52_CHANNEL_MASK)) {
+
+    case CONVERT (A52_CHANNEL, A52_CHANNEL2):
+	memcpy (samples, samples + 256, 256 * sizeof (sample_t));
+	break;
+
+    case CONVERT (A52_CHANNEL, A52_MONO):
+    case CONVERT (A52_STEREO, A52_MONO):
+    mix_2to1:
+	mix2to1 (samples, samples + 256, bias);
+	break;
+
+    case CONVERT (A52_2F1R, A52_MONO):
+	if (slev == 0)
+	    goto mix_2to1;
+    case CONVERT (A52_3F, A52_MONO):
+    mix_3to1:
+	mix3to1 (samples, bias);
+	break;
+
+    case CONVERT (A52_3F1R, A52_MONO):
+	if (slev == 0)
+	    goto mix_3to1;
+    case CONVERT (A52_2F2R, A52_MONO):
+	if (slev == 0)
+	    goto mix_2to1;
+	mix4to1 (samples, bias);
+	break;
+
+    case CONVERT (A52_3F2R, A52_MONO):
+	if (slev == 0)
+	    goto mix_3to1;
+	mix5to1 (samples, bias);
+	break;
+
+    case CONVERT (A52_MONO, A52_DOLBY):
+	memcpy (samples + 256, samples, 256 * sizeof (sample_t));
+	break;
+
+    case CONVERT (A52_3F, A52_STEREO):
+    case CONVERT (A52_3F, A52_DOLBY):
+    mix_3to2:
+	mix3to2 (samples, bias);
+	break;
+
+    case CONVERT (A52_2F1R, A52_STEREO):
+	if (slev == 0)
+	    break;
+	mix21to2 (samples, samples + 256, bias);
+	break;
+
+    case CONVERT (A52_2F1R, A52_DOLBY):
+	mix21toS (samples, bias);
+	break;
+
+    case CONVERT (A52_3F1R, A52_STEREO):
+	if (slev == 0)
+	    goto mix_3to2;
+	mix31to2 (samples, bias);
+	break;
+
+    case CONVERT (A52_3F1R, A52_DOLBY):
+	mix31toS (samples, bias);
+	break;
+
+    case CONVERT (A52_2F2R, A52_STEREO):
+	if (slev == 0)
+	    break;
+	mix2to1 (samples, samples + 512, bias);
+	mix2to1 (samples + 256, samples + 768, bias);
+	break;
+
+    case CONVERT (A52_2F2R, A52_DOLBY):
+	mix22toS (samples, bias);
+	break;
+
+    case CONVERT (A52_3F2R, A52_STEREO):
+	if (slev == 0)
+	    goto mix_3to2;
+	mix32to2 (samples, bias);
+	break;
+
+    case CONVERT (A52_3F2R, A52_DOLBY):
+	mix32toS (samples, bias);
+	break;
+
+    case CONVERT (A52_3F1R, A52_3F):
+	if (slev == 0)
+	    break;
+	mix21to2 (samples, samples + 512, bias);
+	break;
+
+    case CONVERT (A52_3F2R, A52_3F):
+	if (slev == 0)
+	    break;
+	mix2to1 (samples, samples + 768, bias);
+	mix2to1 (samples + 512, samples + 1024, bias);
+	break;
+
+    case CONVERT (A52_3F1R, A52_2F1R):
+	mix3to2 (samples, bias);
+	memcpy (samples + 512, samples + 768, 256 * sizeof (sample_t));
+	break;
+
+    case CONVERT (A52_2F2R, A52_2F1R):
+	mix2to1 (samples + 512, samples + 768, bias);
+	break;
+
+    case CONVERT (A52_3F2R, A52_2F1R):
+	mix3to2 (samples, bias);
+	move2to1 (samples + 768, samples + 512, bias);
+	break;
+
+    case CONVERT (A52_3F2R, A52_3F1R):
+	mix2to1 (samples + 768, samples + 1024, bias);
+	break;
+
+    case CONVERT (A52_2F1R, A52_2F2R):
+	memcpy (samples + 768, samples + 512, 256 * sizeof (sample_t));
+	break;
+
+    case CONVERT (A52_3F1R, A52_2F2R):
+	mix3to2 (samples, bias);
+	memcpy (samples + 512, samples + 768, 256 * sizeof (sample_t));
+	break;
+
+    case CONVERT (A52_3F2R, A52_2F2R):
+	mix3to2 (samples, bias);
+	memcpy (samples + 512, samples + 768, 256 * sizeof (sample_t));
+	memcpy (samples + 768, samples + 1024, 256 * sizeof (sample_t));
+	break;
+
+    case CONVERT (A52_3F1R, A52_3F2R):
+	memcpy (samples + 1027, samples + 768, 256 * sizeof (sample_t));
+	break;
+    }
+}
+
+void a52_upmix (sample_t * samples, int acmod, int output)
+{
+    switch (CONVERT (acmod, output & A52_CHANNEL_MASK)) {
+
+    case CONVERT (A52_CHANNEL, A52_CHANNEL2):
+	memcpy (samples + 256, samples, 256 * sizeof (sample_t));
+	break;
+
+    case CONVERT (A52_3F2R, A52_MONO):
+	zero (samples + 1024);
+    case CONVERT (A52_3F1R, A52_MONO):
+    case CONVERT (A52_2F2R, A52_MONO):
+	zero (samples + 768);
+    case CONVERT (A52_3F, A52_MONO):
+    case CONVERT (A52_2F1R, A52_MONO):
+	zero (samples + 512);
+    case CONVERT (A52_CHANNEL, A52_MONO):
+    case CONVERT (A52_STEREO, A52_MONO):
+	zero (samples + 256);
+	break;
+
+    case CONVERT (A52_3F2R, A52_STEREO):
+    case CONVERT (A52_3F2R, A52_DOLBY):
+	zero (samples + 1024);
+    case CONVERT (A52_3F1R, A52_STEREO):
+    case CONVERT (A52_3F1R, A52_DOLBY):
+	zero (samples + 768);
+    case CONVERT (A52_3F, A52_STEREO):
+    case CONVERT (A52_3F, A52_DOLBY):
+    mix_3to2:
+	memcpy (samples + 512, samples + 256, 256 * sizeof (sample_t));
+	zero (samples + 256);
+	break;
+
+    case CONVERT (A52_2F2R, A52_STEREO):
+    case CONVERT (A52_2F2R, A52_DOLBY):
+	zero (samples + 768);
+    case CONVERT (A52_2F1R, A52_STEREO):
+    case CONVERT (A52_2F1R, A52_DOLBY):
+	zero (samples + 512);
+	break;
+
+    case CONVERT (A52_3F2R, A52_3F):
+	zero (samples + 1024);
+    case CONVERT (A52_3F1R, A52_3F):
+    case CONVERT (A52_2F2R, A52_2F1R):
+	zero (samples + 768);
+	break;
+
+    case CONVERT (A52_3F2R, A52_3F1R):
+	zero (samples + 1024);
+	break;
+
+    case CONVERT (A52_3F2R, A52_2F1R):
+	zero (samples + 1024);
+    case CONVERT (A52_3F1R, A52_2F1R):
+    mix_31to21:
+	memcpy (samples + 768, samples + 512, 256 * sizeof (sample_t));
+	goto mix_3to2;
+
+    case CONVERT (A52_3F2R, A52_2F2R):
+	memcpy (samples + 1024, samples + 768, 256 * sizeof (sample_t));
+	goto mix_31to21;
+    }
+}