1 /***
2 Copyright 2012 Peter Meerwald <p.meerwald@bct-electronic.com>
3
4 PulseAudio is free software; you can redistribute it and/or modify
5 it under the terms of the GNU Lesser General Public License as published
6 by the Free Software Foundation; either version 2.1 of the License,
7 or (at your option) any later version.
8
9 PulseAudio is distributed in the hope that it will be useful, but
10 WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 General Public License for more details.
13
14 ***/
15
16 #ifdef HAVE_CONFIG_H
17 #include <config.h>
18 #endif
19
20 #include <pulse/cdecl.h>
21
22 PA_C_DECL_BEGIN
23 #include <pulsecore/core-util.h>
24 #include <pulsecore/modargs.h>
25 #include "echo-cancel.h"
26 PA_C_DECL_END
27
pa_null_ec_init(pa_core * c,pa_echo_canceller * ec,pa_sample_spec * rec_ss,pa_channel_map * rec_map,pa_sample_spec * play_ss,pa_channel_map * play_map,pa_sample_spec * out_ss,pa_channel_map * out_map,uint32_t * nframes,const char * args)28 bool pa_null_ec_init(pa_core *c, pa_echo_canceller *ec,
29 pa_sample_spec *rec_ss, pa_channel_map *rec_map,
30 pa_sample_spec *play_ss, pa_channel_map *play_map,
31 pa_sample_spec *out_ss, pa_channel_map *out_map,
32 uint32_t *nframes, const char *args) {
33 char strss_source[PA_SAMPLE_SPEC_SNPRINT_MAX];
34 char strss_sink[PA_SAMPLE_SPEC_SNPRINT_MAX];
35
36 *nframes = 256;
37 ec->params.null.out_ss = *out_ss;
38
39 *rec_ss = *out_ss;
40 *rec_map = *out_map;
41
42 pa_log_debug("null AEC: nframes=%u, sample spec source=%s, sample spec sink=%s", *nframes,
43 pa_sample_spec_snprint(strss_source, sizeof(strss_source), out_ss),
44 pa_sample_spec_snprint(strss_sink, sizeof(strss_sink), play_ss));
45
46 return true;
47 }
48
pa_null_ec_run(pa_echo_canceller * ec,const uint8_t * rec,const uint8_t * play,uint8_t * out)49 void pa_null_ec_run(pa_echo_canceller *ec, const uint8_t *rec, const uint8_t *play, uint8_t *out) {
50 /* The null implementation simply copies the recorded buffer to the output
51 buffer and ignores the play buffer. */
52 memcpy(out, rec, 256 * pa_frame_size(&ec->params.null.out_ss));
53 }
54
pa_null_ec_done(pa_echo_canceller * ec)55 void pa_null_ec_done(pa_echo_canceller *ec) {
56 }
57