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

   1 /***
   2     This file is part of PulseAudio.
   3
   4     Copyright 2010 Arun Raghavan <arun.raghavan@collabora.co.uk>
   5
   6     PulseAudio is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU Lesser General Public License as published
   8     by the Free Software Foundation; either version 2.1 of the License,
   9     or (at your option) any later version.
  10
  11     PulseAudio is distributed in the hope that it will be useful, but
  12     WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14     General Public License for more details.
  15
  16     You should have received a copy of the GNU Lesser General Public License
  17     along with PulseAudio; if not, write to the Free Software
  18     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19     USA.
  20 ***/
  21
  22 #ifndef fooechocancelhfoo
  23 #define fooechocancelhfoo
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include <config.h>
  27 #endif
  28
  29 #include <pulse/sample.h>
  30 #include <pulse/channelmap.h>
  31 #include <pulsecore/core.h>
  32 #include <pulsecore/macro.h>
  33
  34 #include <speex/speex_echo.h>
  35 #include <speex/speex_preprocess.h>
  36 #include "adrian.h"
  37
  38 /* Common data structures */
  39
  40 typedef struct pa_echo_canceller_msg pa_echo_canceller_msg;
  41
  42 typedef struct pa_echo_canceller_params pa_echo_canceller_params;
  43
  44 struct pa_echo_canceller_params {
  45     union {
  46         struct {
  47             SpeexEchoState *state;
  48             SpeexPreprocessState *pp_state;
  49         } speex;
  50         struct {
  51             uint32_t blocksize;
  52             AEC *aec;
  53         } adrian;
  54 #ifdef HAVE_WEBRTC
  55         struct {
  56             /* This is a void* so that we don't have to convert this whole file
  57              * to C++ linkage. apm is a pointer to an AudioProcessing object */
  58             void *apm;
  59             uint32_t blocksize;
  60             pa_sample_spec sample_spec;
  61         } webrtc;
  62 #endif
  63         /* each canceller-specific structure goes here */
  64     } priv;
  65
  66     /* Set this if canceller can do drift compensation. Also see set_drift()
  67      * below */
  68     pa_bool_t drift_compensation;
  69 };
  70
  71 typedef struct pa_echo_canceller pa_echo_canceller;
  72
  73 struct pa_echo_canceller {
  74     /* Initialise canceller engine. */
  75     pa_bool_t   (*init)                 (pa_core *c,
  76                                          pa_echo_canceller *ec,
  77                                          pa_sample_spec *source_ss,
  78                                          pa_channel_map *source_map,
  79                                          pa_sample_spec *sink_ss,
  80                                          pa_channel_map *sink_map,
  81                                          uint32_t *blocksize,
  82                                          const char *args);
  83
  84     /* You should have only one of play()+record() or run() set. The first
  85      * works under the assumption that you'll handle buffering and matching up
  86      * samples yourself. If you set run(), module-echo-cancel will handle
  87      * synchronising the playback and record streams. */
  88
  89     /* Feed the engine 'blocksize' playback bytes.. */
  90     void        (*play)                 (pa_echo_canceller *ec, const uint8_t *play);
  91     /* Feed the engine 'blocksize' record bytes. blocksize processed bytes are
  92      * returned in out. */
  93     void        (*record)               (pa_echo_canceller *ec, const uint8_t *rec, uint8_t *out);
  94     /* Feed the engine blocksize playback and record streams, with a reasonable
  95      * effort at keeping the two in sync. blocksize processed bytes are
  96      * returned in out. */
  97     void        (*run)                  (pa_echo_canceller *ec, const uint8_t *rec, const uint8_t *play, uint8_t *out);
  98
  99     /* Optional callback to set the drift, expressed as the ratio of the
 100      * difference in number of playback and capture samples to the number of
 101      * capture samples, for some instant of time. This is used only if the
 102      * canceller signals that it supports drift compensation, and is called
 103      * before record(). The actual implementation needs to derive drift based
 104      * on point samples -- the individual values are not accurate enough to use
 105      * as-is. */
 106     /* NOTE: the semantics of this function might change in the future. */
 107     void        (*set_drift)            (pa_echo_canceller *ec, float drift);
 108
 109     /* Free up resources. */
 110     void        (*done)                 (pa_echo_canceller *ec);
 111
 112     /* Structure with common and engine-specific canceller parameters. */
 113     pa_echo_canceller_params params;
 114
 115     /* msgobject that can be used to send messages back to the main thread */
 116     pa_echo_canceller_msg *msg;
 117 };
 118
 119 /* Functions to be used by the canceller analog gain control routines */
 120 void pa_echo_canceller_get_capture_volume(pa_echo_canceller *ec, pa_cvolume *v);
 121 void pa_echo_canceller_set_capture_volume(pa_echo_canceller *ec, pa_cvolume *v);
 122
 123 /* Speex canceller functions */
 124 pa_bool_t pa_speex_ec_init(pa_core *c, pa_echo_canceller *ec,
 125                            pa_sample_spec *source_ss, pa_channel_map *source_map,
 126                            pa_sample_spec *sink_ss, pa_channel_map *sink_map,
 127                            uint32_t *blocksize, const char *args);
 128 void pa_speex_ec_run(pa_echo_canceller *ec, const uint8_t *rec, const uint8_t *play, uint8_t *out);
 129 void pa_speex_ec_done(pa_echo_canceller *ec);
 130
 131 /* Adrian Andre's echo canceller */
 132 pa_bool_t pa_adrian_ec_init(pa_core *c, pa_echo_canceller *ec,
 133                            pa_sample_spec *source_ss, pa_channel_map *source_map,
 134                            pa_sample_spec *sink_ss, pa_channel_map *sink_map,
 135                            uint32_t *blocksize, const char *args);
 136 void pa_adrian_ec_run(pa_echo_canceller *ec, const uint8_t *rec, const uint8_t *play, uint8_t *out);
 137 void pa_adrian_ec_done(pa_echo_canceller *ec);
 138
 139 #ifdef HAVE_WEBRTC
 140 /* WebRTC canceller functions */
 141 PA_C_DECL_BEGIN
 142 pa_bool_t pa_webrtc_ec_init(pa_core *c, pa_echo_canceller *ec,
 143                             pa_sample_spec *source_ss, pa_channel_map *source_map,
 144                             pa_sample_spec *sink_ss, pa_channel_map *sink_map,
 145                             uint32_t *blocksize, const char *args);
 146 void pa_webrtc_ec_play(pa_echo_canceller *ec, const uint8_t *play);
 147 void pa_webrtc_ec_record(pa_echo_canceller *ec, const uint8_t *rec, uint8_t *out);
 148 void pa_webrtc_ec_set_drift(pa_echo_canceller *ec, float drift);
 149 void pa_webrtc_ec_run(pa_echo_canceller *ec, const uint8_t *rec, const uint8_t *play, uint8_t *out);
 150 void pa_webrtc_ec_done(pa_echo_canceller *ec);
 151 PA_C_DECL_END
 152 #endif
 153
 154 #endif /* fooechocancelhfoo */