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 pa_bool_t pa_null_ec_init(pa_core *c, pa_echo_canceller *ec,
  29                            pa_sample_spec *source_ss, pa_channel_map *source_map,
  30                            pa_sample_spec *sink_ss, pa_channel_map *sink_map,
  31                            uint32_t *nframes, const char *args) {
  32     char strss_source[PA_SAMPLE_SPEC_SNPRINT_MAX];
  33     char strss_sink[PA_SAMPLE_SPEC_SNPRINT_MAX];
  34
  35     *nframes = 256;
  36     ec->params.priv.null.source_ss = *source_ss;
  37
  38     pa_log_debug("null AEC: nframes=%u, sample spec source=%s, sample spec sink=%s", *nframes,
  39             pa_sample_spec_snprint(strss_source, sizeof(strss_source), source_ss),
  40             pa_sample_spec_snprint(strss_sink, sizeof(strss_sink), sink_ss));
  41
  42     return TRUE;
  43 }
  44
  45 void pa_null_ec_run(pa_echo_canceller *ec, const uint8_t *rec, const uint8_t *play, uint8_t *out) {
  46     /* The null implementation simply copies the recorded buffer to the output
  47        buffer and ignores the play buffer. */
  48     memcpy(out, rec, 256 * pa_frame_size(&ec->params.priv.null.source_ss));
  49 }
  50
  51 void pa_null_ec_done(pa_echo_canceller *ec) {
  52 }