gstreamer/ext/vorbis/gstvorbisdeclib.c
2013-05-03 15:49:50 +02:00

194 lines
4.3 KiB
C

/* GStreamer
* Copyright (C) 2010 Mark Nauwelaerts <mark.nauwelaerts@collabora.co.uk>
* Copyright (C) 2010 Nokia Corporation. All rights reserved.
* Contact: Stefan Kost <stefan.kost@nokia.com>
*
* Tremor modifications <2006>:
* Chris Lord, OpenedHand Ltd. <chris@openedhand.com>, http://www.o-hand.com/
*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "gstvorbisdeclib.h"
#include "gstvorbiscommon.h"
#ifndef TREMOR
/* These samples can be outside of the float -1.0 -- 1.0 range, this
* is allowed, downstream elements are supposed to clip */
static void
copy_samples_m (vorbis_sample_t * out, vorbis_sample_t ** in, guint samples,
gint channels)
{
memcpy (out, in[0], samples * sizeof (float));
}
static void
copy_samples_s (vorbis_sample_t * out, vorbis_sample_t ** in, guint samples,
gint channels)
{
#ifdef GST_VORBIS_DEC_SEQUENTIAL
memcpy (out, in[0], samples * sizeof (float));
out += samples;
memcpy (out, in[1], samples * sizeof (float));
#else
gint j;
for (j = 0; j < samples; j++) {
*out++ = in[0][j];
*out++ = in[1][j];
}
#endif
}
static void
copy_samples (vorbis_sample_t * out, vorbis_sample_t ** in, guint samples,
gint channels)
{
#ifdef GST_VORBIS_DEC_SEQUENTIAL
gint i;
for (i = 0; i < channels; i++) {
memcpy (out, in[gst_vorbis_reorder_map[channels - 1][i]],
samples * sizeof (float));
out += samples;
}
#else
gint i, j;
for (j = 0; j < samples; j++) {
for (i = 0; i < channels; i++) {
*out++ = in[gst_vorbis_reorder_map[channels - 1][i]][j];
}
}
#endif
}
CopySampleFunc
gst_vorbis_get_copy_sample_func (gint channels)
{
CopySampleFunc f = NULL;
switch (channels) {
case 1:
f = copy_samples_m;
break;
case 2:
f = copy_samples_s;
break;
default:
f = copy_samples;
break;
}
return f;
}
#else
/* Taken from Tremor, misc.h */
#ifdef _ARM_ASSEM_
static inline ogg_int32_t
CLIP_TO_15 (ogg_int32_t x)
{
int tmp;
asm volatile ("subs %1, %0, #32768\n\t"
"movpl %0, #0x7f00\n\t"
"orrpl %0, %0, #0xff\n"
"adds %1, %0, #32768\n\t"
"movmi %0, #0x8000":"+r" (x), "=r" (tmp)
::"cc");
return (x);
}
#else
static inline ogg_int32_t
CLIP_TO_15 (ogg_int32_t x)
{
int ret = x;
ret -= ((x <= 32767) - 1) & (x - 32767);
ret -= ((x >= -32768) - 1) & (x + 32768);
return (ret);
}
#endif
static void
copy_samples_16_m (vorbis_sample_t * _out, vorbis_sample_t ** _in,
guint samples, gint channels)
{
gint16 *out = (gint16 *) _out;
ogg_int32_t **in = (ogg_int32_t **) _in;
gint j;
for (j = 0; j < samples; j++) {
*out++ = CLIP_TO_15 (in[0][j] >> 9);
}
}
static void
copy_samples_16_s (vorbis_sample_t * _out, vorbis_sample_t ** _in,
guint samples, gint channels)
{
gint16 *out = (gint16 *) _out;
ogg_int32_t **in = (ogg_int32_t **) _in;
gint j;
for (j = 0; j < samples; j++) {
*out++ = CLIP_TO_15 (in[0][j] >> 9);
*out++ = CLIP_TO_15 (in[1][j] >> 9);
}
}
static void
copy_samples_16 (vorbis_sample_t * _out, vorbis_sample_t ** _in, guint samples,
gint channels)
{
gint16 *out = (gint16 *) _out;
ogg_int32_t **in = (ogg_int32_t **) _in;
gint i, j;
for (j = 0; j < samples; j++) {
for (i = 0; i < channels; i++) {
*out++ = CLIP_TO_15 (in[gst_vorbis_reorder_map[channels - 1][i]][j] >> 9);
}
}
}
CopySampleFunc
gst_vorbis_get_copy_sample_func (gint channels)
{
CopySampleFunc f = NULL;
switch (channels) {
case 1:
f = copy_samples_16_m;
break;
case 2:
f = copy_samples_16_s;
break;
default:
f = copy_samples_16;
break;
}
return f;
}
#endif