code.delx.au - pulseaudio/blob - src/modules/echo-cancel/null.c

   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
  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.priv.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
  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.priv.null.out_ss));
  53 }
  54
  55 void pa_null_ec_done(pa_echo_canceller *ec) {
  56 }