2 * Copyright (C) <2001> David A. Schleef <ds@schleef.org>
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
35 GST_DEBUG_CATEGORY (libaudioresample_debug);
40 static int inited = 0;
44 GST_DEBUG_CATEGORY_INIT (libaudioresample_debug, "libaudioresample", 0,
45 "audio resampling library");
55 r = malloc (sizeof (ResampleState));
56 memset (r, 0, sizeof (ResampleState));
58 r->filter_length = 16;
61 if (r->filter_length & 1) {
64 r->o_start = r->o_inc * 0.5;
67 r->queue = audioresample_buffer_queue_new ();
68 r->out_tmp = malloc (10000 * sizeof (double));
76 resample_free (ResampleState * r)
82 functable_free (r->ft);
85 audioresample_buffer_queue_free (r->queue);
95 resample_buffer_free (AudioresampleBuffer * buffer, void *priv)
98 ((void (*)(void *)) buffer->priv2) (buffer->priv);
103 * free_func: a function that frees the given closure. If NULL, caller is
104 * responsible for freeing.
107 resample_add_input_data (ResampleState * r, void *data, int size,
108 void (*free_func) (void *), void *closure)
110 AudioresampleBuffer *buffer;
112 RESAMPLE_DEBUG ("data %p size %d", data, size);
114 buffer = audioresample_buffer_new_with_data (data, size);
115 buffer->free = resample_buffer_free;
116 buffer->priv2 = (void *) free_func;
117 buffer->priv = closure;
119 audioresample_buffer_queue_push (r->queue, buffer);
123 resample_input_flush (ResampleState * r)
125 RESAMPLE_DEBUG ("flush");
127 audioresample_buffer_queue_flush (r->queue);
128 r->buffer_filled = 0;
133 resample_input_pushthrough (ResampleState * r)
135 AudioresampleBuffer *buffer;
139 if (r->sample_size == 0)
142 filter_bytes = r->filter_length * r->sample_size;
143 buffer_filled = r->buffer_filled;
145 RESAMPLE_DEBUG ("pushthrough filter_bytes %d, filled %d",
146 filter_bytes, buffer_filled);
148 /* if we have no pending samples, we don't need to do anything. */
149 if (buffer_filled <= 0)
152 /* send filter_length/2 number of samples so we can get to the
153 * last queued samples */
154 buffer = audioresample_buffer_new_and_alloc (filter_bytes / 2);
155 memset (buffer->data, 0, buffer->length);
157 RESAMPLE_DEBUG ("pushthrough %u", buffer->length);
159 audioresample_buffer_queue_push (r->queue, buffer);
163 resample_input_eos (ResampleState * r)
165 RESAMPLE_DEBUG ("EOS");
166 resample_input_pushthrough (r);
171 resample_get_output_size_for_input (ResampleState * r, int size)
179 if (r->sample_size == 0)
182 filter_bytes = r->filter_length * r->sample_size;
183 buffer_filled = filter_bytes / 2 - r->buffer_filled / 2;
186 audioresample_buffer_queue_get_depth (r->queue) + size - buffer_filled;
188 RESAMPLE_DEBUG ("avail %d, o_rate %f, i_rate %f, filter_bytes %d, filled %d",
189 avail, r->o_rate, r->i_rate, filter_bytes, buffer_filled);
193 outd = (double) avail *r->o_rate / r->i_rate;
195 outsize = (int) floor (outd);
197 /* round off for sample size */
198 outsize -= outsize % r->sample_size;
204 resample_get_input_size_for_output (ResampleState * r, int size)
210 if (r->sample_size == 0)
215 RESAMPLE_DEBUG ("size %d, o_rate %f, i_rate %f", avail, r->o_rate, r->i_rate);
216 outd = (double) avail *r->i_rate / r->o_rate;
218 outsize = (int) ceil (outd);
220 /* round off for sample size */
221 outsize -= outsize % r->sample_size;
227 resample_get_output_size (ResampleState * r)
229 return resample_get_output_size_for_input (r, 0);
233 resample_get_output_data (ResampleState * r, void *data, int size)
243 resample_scale_ref (r);
246 resample_scale_functable (r);
252 return size - r->o_size;
256 resample_set_filter_length (ResampleState * r, int length)
258 r->filter_length = length;
263 resample_set_input_rate (ResampleState * r, double rate)
270 resample_set_output_rate (ResampleState * r, double rate)
277 resample_set_n_channels (ResampleState * r, int n_channels)
279 r->n_channels = n_channels;
280 r->sample_size = r->n_channels * resample_format_size (r->format);
285 resample_set_format (ResampleState * r, ResampleFormat format)
288 r->sample_size = r->n_channels * resample_format_size (r->format);
293 resample_set_method (ResampleState * r, int method)
300 resample_format_size (ResampleFormat format)
303 case RESAMPLE_FORMAT_S16:
305 case RESAMPLE_FORMAT_S32:
306 case RESAMPLE_FORMAT_F32:
308 case RESAMPLE_FORMAT_F64: