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-rw-r--r--gst/audioresample/resample_ref.c223
1 files changed, 0 insertions, 223 deletions
diff --git a/gst/audioresample/resample_ref.c b/gst/audioresample/resample_ref.c
deleted file mode 100644
index bb8d2411..00000000
--- a/gst/audioresample/resample_ref.c
+++ /dev/null
@@ -1,223 +0,0 @@
-/* Resampling library
- * Copyright (C) <2001> David A. Schleef <ds@schleef.org>
- *
- * 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 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.
- */
-
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-
-
-#include <string.h>
-#include <math.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <limits.h>
-#include <liboil/liboil.h>
-
-#include "resample.h"
-#include "buffer.h"
-#include "debug.h"
-
-
-static double
-resample_sinc_window (double x, double halfwidth, double scale)
-{
- double y;
-
- if (x == 0)
- return 1.0;
- if (x < -halfwidth || x > halfwidth)
- return 0.0;
-
- y = sin (x * M_PI * scale) / (x * M_PI * scale) * scale;
-
- x /= halfwidth;
- y *= (1 - x * x) * (1 - x * x);
-
- return y;
-}
-
-void
-resample_scale_ref (ResampleState * r)
-{
- if (r->need_reinit) {
- RESAMPLE_DEBUG ("sample size %d", r->sample_size);
-
- if (r->buffer)
- free (r->buffer);
- r->buffer_len = r->sample_size * r->filter_length;
- r->buffer = malloc (r->buffer_len);
- memset (r->buffer, 0, r->buffer_len);
- r->buffer_filled = 0;
-
- r->i_inc = r->o_rate / r->i_rate;
- r->o_inc = r->i_rate / r->o_rate;
- RESAMPLE_DEBUG ("i_inc %g o_inc %g", r->i_inc, r->o_inc);
-
- r->i_start = -r->i_inc * r->filter_length;
-
- r->need_reinit = 0;
-
-#if 0
- if (r->i_inc < 1.0) {
- r->sinc_scale = r->i_inc;
- if (r->sinc_scale == 0.5) {
- /* strange things happen at integer multiples */
- r->sinc_scale = 1.0;
- }
- } else {
- r->sinc_scale = 1.0;
- }
-#else
- r->sinc_scale = 1.0;
-#endif
- }
-
- RESAMPLE_DEBUG ("asked to resample %d bytes", r->o_size);
- RESAMPLE_DEBUG ("%d bytes in queue",
- audioresample_buffer_queue_get_depth (r->queue));
-
- while (r->o_size >= r->sample_size) {
- double midpoint;
- int i;
- int j;
-
- midpoint = r->i_start + (r->filter_length - 1) * 0.5 * r->i_inc;
- RESAMPLE_DEBUG
- ("still need to output %d bytes, %d input left, i_start %g, midpoint %f",
- r->o_size, audioresample_buffer_queue_get_depth (r->queue), r->i_start,
- midpoint);
- if (midpoint > 0.5 * r->i_inc) {
- RESAMPLE_ERROR ("inconsistent state");
- }
- while (midpoint < -0.5 * r->i_inc) {
- AudioresampleBuffer *buffer;
-
- RESAMPLE_DEBUG ("midpoint %f < %f, r->i_inc %f", midpoint,
- -0.5 * r->i_inc, r->i_inc);
- buffer = audioresample_buffer_queue_pull (r->queue, r->sample_size);
- if (buffer == NULL) {
- /* FIXME: for the first buffer, this isn't necessarily an error,
- * since because of the filter length we'll output less buffers.
- * deal with that so we don't print to console */
- RESAMPLE_ERROR ("buffer_queue_pull returned NULL");
- return;
- }
-
- r->i_start += r->i_inc;
- RESAMPLE_DEBUG ("pulling (i_start = %g)", r->i_start);
-
- midpoint += r->i_inc;
- memmove (r->buffer, r->buffer + r->sample_size,
- r->buffer_len - r->sample_size);
-
- memcpy (r->buffer + r->buffer_len - r->sample_size, buffer->data,
- r->sample_size);
- r->buffer_filled = MIN (r->buffer_filled + r->sample_size, r->buffer_len);
-
- audioresample_buffer_unref (buffer);
- }
-
- switch (r->format) {
- case RESAMPLE_FORMAT_S16:
- for (i = 0; i < r->n_channels; i++) {
- double acc = 0;
- double offset;
- double x;
-
- for (j = 0; j < r->filter_length; j++) {
- offset = (r->i_start + j * r->i_inc) * r->o_inc;
- x = *(int16_t *) (r->buffer + i * sizeof (int16_t) +
- j * r->sample_size);
- acc +=
- resample_sinc_window (offset, r->filter_length * 0.5,
- r->sinc_scale) * x;
- }
- if (acc < -32768.0)
- acc = -32768.0;
- if (acc > 32767.0)
- acc = 32767.0;
-
- *(int16_t *) (r->o_buf + i * sizeof (int16_t)) = rint (acc);
- }
- break;
- case RESAMPLE_FORMAT_S32:
- for (i = 0; i < r->n_channels; i++) {
- double acc = 0;
- double offset;
- double x;
-
- for (j = 0; j < r->filter_length; j++) {
- offset = (r->i_start + j * r->i_inc) * r->o_inc;
- x = *(int32_t *) (r->buffer + i * sizeof (int32_t) +
- j * r->sample_size);
- acc +=
- resample_sinc_window (offset, r->filter_length * 0.5,
- r->sinc_scale) * x;
- }
- if (acc < -2147483648.0)
- acc = -2147483648.0;
- if (acc > 2147483647.0)
- acc = 2147483647.0;
-
- *(int32_t *) (r->o_buf + i * sizeof (int32_t)) = rint (acc);
- }
- break;
- case RESAMPLE_FORMAT_F32:
- for (i = 0; i < r->n_channels; i++) {
- double acc = 0;
- double offset;
- double x;
-
- for (j = 0; j < r->filter_length; j++) {
- offset = (r->i_start + j * r->i_inc) * r->o_inc;
- x = *(float *) (r->buffer + i * sizeof (float) +
- j * r->sample_size);
- acc +=
- resample_sinc_window (offset, r->filter_length * 0.5,
- r->sinc_scale) * x;
- }
-
- *(float *) (r->o_buf + i * sizeof (float)) = acc;
- }
- break;
- case RESAMPLE_FORMAT_F64:
- for (i = 0; i < r->n_channels; i++) {
- double acc = 0;
- double offset;
- double x;
-
- for (j = 0; j < r->filter_length; j++) {
- offset = (r->i_start + j * r->i_inc) * r->o_inc;
- x = *(double *) (r->buffer + i * sizeof (double) +
- j * r->sample_size);
- acc +=
- resample_sinc_window (offset, r->filter_length * 0.5,
- r->sinc_scale) * x;
- }
-
- *(double *) (r->o_buf + i * sizeof (double)) = acc;
- }
- break;
- }
-
- r->i_start -= 1.0;
- r->o_buf += r->sample_size;
- r->o_size -= r->sample_size;
- }
-}
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