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 #ifdef HAVE_SPEEX
  35 #include <speex/speex_echo.h>
  36 #include <speex/speex_preprocess.h>
  37 #endif
  38
  39 #include "adrian.h"
  40
  41 /* Common data structures */
  42
  43 typedef struct pa_echo_canceller_msg pa_echo_canceller_msg;
  44
  45 typedef struct pa_echo_canceller_params pa_echo_canceller_params;
  46
  47 struct pa_echo_canceller_params {
  48     union {
  49         struct {
  50             pa_sample_spec source_ss;
  51         } null;
  52 #ifdef HAVE_SPEEX
  53         struct {
  54             SpeexEchoState *state;
  55             SpeexPreprocessState *pp_state;
  56         } speex;
  57 #endif
  58 #ifdef HAVE_ADRIAN_EC
  59         struct {
  60             uint32_t blocksize;
  61             AEC *aec;
  62         } adrian;
  63 #endif
  64 #ifdef HAVE_WEBRTC
  65         struct {
  66             /* This is a void* so that we don't have to convert this whole file
  67              * to C++ linkage. apm is a pointer to an AudioProcessing object */
  68             void *apm;
  69             uint32_t blocksize;
  70             pa_sample_spec sample_spec;
  71             pa_bool_t agc;
  72         } webrtc;
  73 #endif
  74         /* each canceller-specific structure goes here */
  75     } priv;
  76
  77     /* Set this if canceller can do drift compensation. Also see set_drift()
  78      * below */
  79     pa_bool_t drift_compensation;
  80 };
  81
  82 typedef struct pa_echo_canceller pa_echo_canceller;
  83
  84 struct pa_echo_canceller {
  85     /* Initialise canceller engine. */
  86     pa_bool_t   (*init)                 (pa_core *c,
  87                                          pa_echo_canceller *ec,
  88                                          pa_sample_spec *source_ss,
  89                                          pa_channel_map *source_map,
  90                                          pa_sample_spec *sink_ss,
  91                                          pa_channel_map *sink_map,
  92                                          uint32_t *nframes,
  93                                          const char *args);
  94
  95     /* You should have only one of play()+record() or run() set. The first
  96      * works under the assumption that you'll handle buffering and matching up
  97      * samples yourself. If you set run(), module-echo-cancel will handle
  98      * synchronising the playback and record streams. */
  99
 100     /* Feed the engine 'nframes' playback frames. */
 101     void        (*play)                 (pa_echo_canceller *ec, const uint8_t *play);
 102     /* Feed the engine 'nframes' record frames. nframes processed frames are
 103      * returned in out. */
 104     void        (*record)               (pa_echo_canceller *ec, const uint8_t *rec, uint8_t *out);
 105     /* Feed the engine nframes playback and record frames, with a reasonable
 106      * effort at keeping the two in sync. nframes processed frames are
 107      * returned in out. */
 108     void        (*run)                  (pa_echo_canceller *ec, const uint8_t *rec, const uint8_t *play, uint8_t *out);
 109
 110     /* Optional callback to set the drift, expressed as the ratio of the
 111      * difference in number of playback and capture samples to the number of
 112      * capture samples, for some instant of time. This is used only if the
 113      * canceller signals that it supports drift compensation, and is called
 114      * before record(). The actual implementation needs to derive drift based
 115      * on point samples -- the individual values are not accurate enough to use
 116      * as-is. */
 117     /* NOTE: the semantics of this function might change in the future. */
 118     void        (*set_drift)            (pa_echo_canceller *ec, float drift);
 119
 120     /* Free up resources. */
 121     void        (*done)                 (pa_echo_canceller *ec);
 122
 123     /* Structure with common and engine-specific canceller parameters. */
 124     pa_echo_canceller_params params;
 125
 126     /* msgobject that can be used to send messages back to the main thread */
 127     pa_echo_canceller_msg *msg;
 128 };
 129
 130 /* Functions to be used by the canceller analog gain control routines */
 131 void pa_echo_canceller_get_capture_volume(pa_echo_canceller *ec, pa_cvolume *v);
 132 void pa_echo_canceller_set_capture_volume(pa_echo_canceller *ec, pa_cvolume *v);
 133
 134 /* Computes EC block size in frames (rounded down to nearest power-of-2) based
 135  * on sample rate and milliseconds. */
 136 uint32_t pa_echo_canceller_blocksize_power2(unsigned rate, unsigned ms);
 137
 138 /* Null canceller functions */
 139 pa_bool_t pa_null_ec_init(pa_core *c, pa_echo_canceller *ec,
 140                            pa_sample_spec *source_ss, pa_channel_map *source_map,
 141                            pa_sample_spec *sink_ss, pa_channel_map *sink_map,
 142                            uint32_t *nframes, const char *args);
 143 void pa_null_ec_run(pa_echo_canceller *ec, const uint8_t *rec, const uint8_t *play, uint8_t *out);
 144 void pa_null_ec_done(pa_echo_canceller *ec);
 145
 146 #ifdef HAVE_SPEEX
 147 /* Speex canceller functions */
 148 pa_bool_t pa_speex_ec_init(pa_core *c, pa_echo_canceller *ec,
 149                            pa_sample_spec *source_ss, pa_channel_map *source_map,
 150                            pa_sample_spec *sink_ss, pa_channel_map *sink_map,
 151                            uint32_t *nframes, const char *args);
 152 void pa_speex_ec_run(pa_echo_canceller *ec, const uint8_t *rec, const uint8_t *play, uint8_t *out);
 153 void pa_speex_ec_done(pa_echo_canceller *ec);
 154 #endif
 155
 156 #ifdef HAVE_ADRIAN_EC
 157 /* Adrian Andre's echo canceller */
 158 pa_bool_t pa_adrian_ec_init(pa_core *c, pa_echo_canceller *ec,
 159                            pa_sample_spec *source_ss, pa_channel_map *source_map,
 160                            pa_sample_spec *sink_ss, pa_channel_map *sink_map,
 161                            uint32_t *nframes, const char *args);
 162 void pa_adrian_ec_run(pa_echo_canceller *ec, const uint8_t *rec, const uint8_t *play, uint8_t *out);
 163 void pa_adrian_ec_done(pa_echo_canceller *ec);
 164 #endif
 165
 166 #ifdef HAVE_WEBRTC
 167 /* WebRTC canceller functions */
 168 PA_C_DECL_BEGIN
 169 pa_bool_t pa_webrtc_ec_init(pa_core *c, pa_echo_canceller *ec,
 170                             pa_sample_spec *source_ss, pa_channel_map *source_map,
 171                             pa_sample_spec *sink_ss, pa_channel_map *sink_map,
 172                             uint32_t *nframes, const char *args);
 173 void pa_webrtc_ec_play(pa_echo_canceller *ec, const uint8_t *play);
 174 void pa_webrtc_ec_record(pa_echo_canceller *ec, const uint8_t *rec, uint8_t *out);
 175 void pa_webrtc_ec_set_drift(pa_echo_canceller *ec, float drift);
 176 void pa_webrtc_ec_run(pa_echo_canceller *ec, const uint8_t *rec, const uint8_t *play, uint8_t *out);
 177 void pa_webrtc_ec_done(pa_echo_canceller *ec);
 178 PA_C_DECL_END
 179 #endif
 180
 181 #endif /* fooechocancelhfoo */