mirror of
https://github.com/servalproject/serval-dna.git
synced 2024-12-22 14:32:25 +00:00
264 lines
8.4 KiB
C
264 lines
8.4 KiB
C
/*
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Copyright (C) 2012 Paul Gardner-Stephen
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <dlfcn.h>
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#include <alsa/asoundlib.h>
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#include "serval.h"
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#ifndef ANDROID
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#define ALSA_LIB_PATH "/lib/libasound.so.2"
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#else
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// XXX Verify on a SGS2 ?
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#define ALSA_LIB_PATH "/system/lib/libasound.so.2"
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#endif
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/*
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For Android systems we have the fun that this binary (not just the source code)
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needs to be able to run on systems that lack the alsa library.
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This means it is time for some more dlopen() and dlsym() fun to get the
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necessary symbols we need.
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*/
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typedef struct alsa_functions {
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int (*snd_pcm_open)(snd_pcm_t **,char *,int,int);
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int (*snd_pcm_close)(snd_pcm_t *);
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int (*snd_pcm_hw_params_malloc)(snd_pcm_hw_params_t **);
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int (*snd_pcm_hw_params_any)(snd_pcm_t *,snd_pcm_hw_params_t *);
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int (*snd_pcm_hw_params_set_access)(snd_pcm_t *,snd_pcm_hw_params_t *,int);
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int (*snd_pcm_hw_params_set_format)(snd_pcm_t *,snd_pcm_hw_params_t *,int);
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int (*snd_pcm_hw_params_set_rate_near)(snd_pcm_t *,snd_pcm_hw_params_t *,int,int);
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int (*snd_pcm_hw_params_set_channels)(snd_pcm_t *,snd_pcm_hw_params_t *,int);
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int (*snd_pcm_hw_params)(snd_pcm_t *,snd_pcm_hw_params_t *);
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void (*snd_pcm_hw_params_free)(snd_pcm_hw_params_t *);
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int (*snd_pcm_prepare)(snd_pcm_t *);
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int (*snd_pcm_writei)(snd_pcm_t *,short *,int);
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int (*snd_pcm_readi)(snd_pcm_t *,short *,int);
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int (*snd_pcm_poll_descriptors)(snd_pcm_t *,struct pollfd *,unsigned int);
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} alsa_functions;
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#define S(X) #X
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#define GETSYM(X) {a->X = dlsym(h,S(X)); if (!a->X) { dlclose(h); free(a); return -1; }}
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alsa_functions *alsa = NULL;
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int alsa_load()
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{
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void *h = dlopen(ALSA_LIB_PATH,RTLD_LAZY);
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if (!h) return -1;
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alsa_functions *a=calloc(sizeof(alsa_functions),1);
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GETSYM(snd_pcm_open);
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GETSYM(snd_pcm_hw_params_malloc);
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GETSYM(snd_pcm_hw_params_any);
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GETSYM(snd_pcm_hw_params_set_access);
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GETSYM(snd_pcm_hw_params_set_format);
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GETSYM(snd_pcm_hw_params_set_rate_near);
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GETSYM(snd_pcm_hw_params_set_channels);
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GETSYM(snd_pcm_hw_params);
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GETSYM(snd_pcm_hw_params_free);
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GETSYM(snd_pcm_writei);
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GETSYM(snd_pcm_readi);
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GETSYM(snd_pcm_close);
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GETSYM(snd_pcm_poll_descriptors);
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alsa=a;
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dlclose(h);
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return 0;
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}
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int alsa_handles_initialised=0;
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snd_pcm_t *play_handle;
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snd_pcm_t *record_handle;
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snd_pcm_hw_params_t *play_params;
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snd_pcm_hw_params_t *record_params;
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int audio_alsa_stop_play()
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{
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if (!alsa) return 0;
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alsa->snd_pcm_hw_params_free(play_params); play_params=NULL;
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alsa->snd_pcm_close(play_handle);
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return 0;
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}
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int audio_alsa_stop_record()
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{
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if (!alsa) return 0;
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alsa->snd_pcm_hw_params_free(record_params); record_params=NULL;
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alsa->snd_pcm_close(record_handle);
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return 0;
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}
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int audio_alsa_start_play()
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{
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int r;
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/* if already playing, then return. */
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if (alsa_handles_initialised) return 0;
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if (!alsa) return -1;
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record_handle=NULL; play_handle=NULL;
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record_params=NULL; play_params=NULL;
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/* Open playback device */
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r = alsa->snd_pcm_open (&play_handle,"default",SND_PCM_STREAM_PLAYBACK,
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SND_PCM_NONBLOCK);
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if (r) { WHYF("ALSA pcm_open() failed"); goto error; }
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/* Configure playback device for 8000Hz, 16 bit, mono */
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r=alsa->snd_pcm_hw_params_malloc(&play_params);
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if (r) { WHYF("ALSA hw_params_malloc() failed"); goto error; }
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r=alsa->snd_pcm_hw_params_any(play_handle,play_params);
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if (r) { WHYF("ALSA hw_params_any() failed"); goto error; }
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r=alsa->snd_pcm_hw_params_set_access(play_handle,play_params,
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SND_PCM_ACCESS_RW_INTERLEAVED);
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if (r) { WHYF("ALSA hw_params_set_access() failed"); goto error; }
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r=alsa->snd_pcm_hw_params_set_format(play_handle,play_params,
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SND_PCM_FORMAT_S16_LE);
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if (r) { WHYF("ALSA hw_params_set_format() failed"); goto error; }
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r=alsa->snd_pcm_hw_params_set_rate_near(play_handle,play_params,8000,0);
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if (r) { WHYF("ALSA hw_params_set_rate_near() failed"); goto error; }
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r=alsa->snd_pcm_hw_params_set_channels(play_handle,play_params,1);
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if (r) { WHYF("ALSA hw_params_set_channels() failed"); goto error; }
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r=alsa->snd_pcm_hw_params(play_handle,play_params);
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if (r) { WHYF("ALSA snd_pcm_hw_params() failed"); goto error; }
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alsa->snd_pcm_hw_params_free(play_params); play_params=NULL;
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r=alsa->snd_pcm_prepare(play_handle);
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if (r) { WHYF("ALSA snd_pcm_prepare() failed"); goto error; }
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WHY("Playback device configured");
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error:
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/* close handles and generally cleanup after ourselves */
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audio_alsa_stop_play();
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return -1;
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}
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int audio_alsa_start_record()
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{
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/* Open recording device non-blocking */
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int r = alsa->snd_pcm_open (&record_handle,"default",SND_PCM_STREAM_CAPTURE,
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SND_PCM_NONBLOCK);
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if (r) { WHYF("ALSA pcm_open() failed"); goto error; }
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/* Configure playback device for 8000Hz, 16 bit, mono */
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r=alsa->snd_pcm_hw_params_malloc(&record_params);
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if (r) { WHYF("ALSA hw_params_malloc() failed"); goto error; }
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r=alsa->snd_pcm_hw_params_any(record_handle,record_params);
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if (r) { WHYF("ALSA hw_params_any() failed"); goto error; }
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r=alsa->snd_pcm_hw_params_set_access(record_handle,record_params,
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SND_PCM_ACCESS_RW_INTERLEAVED);
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if (r) { WHYF("ALSA hw_params_set_access() failed"); goto error; }
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r=alsa->snd_pcm_hw_params_set_format(record_handle,record_params,
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SND_PCM_FORMAT_S16_LE);
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if (r) { WHYF("ALSA hw_params_set_format() failed"); goto error; }
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r=alsa->snd_pcm_hw_params_set_rate_near(record_handle,record_params,8000,0);
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if (r) { WHYF("ALSA hw_params_set_rate_near() failed"); goto error; }
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r=alsa->snd_pcm_hw_params_set_channels(record_handle,record_params,1);
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if (r) { WHYF("ALSA hw_params_set_channels() failed"); goto error; }
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r=alsa->snd_pcm_hw_params(record_handle,record_params);
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if (r) { WHYF("ALSA snd_pcm_hw_params() failed"); goto error; }
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alsa->snd_pcm_hw_params_free(record_params); record_params=NULL;
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r=alsa->snd_pcm_prepare(record_handle);
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if (r) { WHYF("ALSA snd_pcm_prepare() failed"); goto error; }
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WHY("Record device configured");
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return 0;
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error:
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/* close handles and generally cleanup after ourselves */
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audio_alsa_stop_record();
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return -1;
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}
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int audio_alsa_stop()
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{
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audio_alsa_stop_play();
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audio_alsa_stop_record();
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return 0;
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}
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int audio_alsa_start()
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{
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if (audio_alsa_start_play()) return -1;
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if (audio_alsa_start_record()) {
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audio_alsa_stop();
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return -1;
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}
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return 0;
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}
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int audio_alsa_pollfds(struct pollfd *fds,int slots)
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{
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int used_play
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=alsa->snd_pcm_poll_descriptors(play_handle,fds,slots);
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int used_record
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=alsa->snd_pcm_poll_descriptors(record_handle,&fds[used_play],slots);
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return used_play+used_record;
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}
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int audio_alsa_read(unsigned char *buffer,int maximum_bytes)
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{
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int frames_read=0;
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if ((frames_read=
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alsa->snd_pcm_readi(record_handle, (short *)buffer, maximum_bytes/2))<0)
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{
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alsa->snd_pcm_prepare(record_handle);
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frames_read
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=alsa->snd_pcm_readi(play_handle, (short *)buffer, maximum_bytes/2);
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}
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return frames_read*2;
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}
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int audio_alsa_write(unsigned char *buffer,int bytes)
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{
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/* 16 bits per sample, so frames = bytes/2 */
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int frames_written=0;
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if ((frames_written=alsa->snd_pcm_writei(play_handle, (short *)buffer, bytes/2))<0)
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{
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alsa->snd_pcm_prepare(play_handle);
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return alsa->snd_pcm_writei(play_handle, (short *)buffer, bytes/2)*2;
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}
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else return 0;
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}
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monitor_audio *audio_alsa_detect()
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{
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if (!alsa) alsa_load();
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if (!alsa) return NULL;
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int r;
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snd_pcm_t *handle;
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if ((r = alsa->snd_pcm_open (&handle, "default", SND_PCM_STREAM_PLAYBACK, 0)) < 0)
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return NULL;
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alsa->snd_pcm_close(handle);
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monitor_audio *au=calloc(sizeof(monitor_audio),1);
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strcpy(au->name,"ALSA compatible");
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au->start=audio_alsa_start;
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au->stop=audio_alsa_stop;
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au->poll_fds=audio_alsa_pollfds;
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au->read=audio_alsa_read;
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au->write=audio_alsa_write;
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return au;
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}
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