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/* Example of simple PocketSphinx speech segmentation.
*
* MIT license (c) 2022, see LICENSE for more information.
*
* Author: David Huggins-Daines <dhdaines@gmail.com>
*/
/**
* @example live_pulseaudio.c
* @brief Speech recognition with live audio input and endpointing.
*
* This file shows how to use PocketSphinx with microphone input using
* PulseAudio.
*
* To compile it, assuming you have built the library as in
* \ref unix_install "these directions", you can run:
*
* cmake --build build --target live_pulseaudio
*
* Alternately, if PocketSphinx is installed system-wide, you can run:
*
* gcc -o live_pulseaudio live_pulseaudio.c \
* $(pkg-config --libs --cflags pocketsphinx libpulse-simple)
*
*
*/
#include <pulse/simple.h>
#include <pulse/error.h>
#include <pocketsphinx.h>
#include <signal.h>
static int global_done = 0;
static void
catch_sig(int signum)
{
(void)signum;
global_done = 1;
}
int
main(int argc, char *argv[])
{
pa_simple *s;
pa_sample_spec ss;
int err;
ps_decoder_t *decoder;
ps_config_t *config;
ps_endpointer_t *ep;
short *frame;
size_t frame_size;
(void)argc; (void)argv;
config = ps_config_init(NULL);
ps_default_search_args(config);
if ((decoder = ps_init(config)) == NULL)
E_FATAL("PocketSphinx decoder init failed\n");
if ((ep = ps_endpointer_init(0, 0.0, 0, 0, 0)) == NULL)
E_FATAL("PocketSphinx endpointer init failed\n");
frame_size = ps_endpointer_frame_size(ep);
if ((frame = malloc(frame_size * sizeof(frame[0]))) == NULL)
E_FATAL_SYSTEM("Failed to allocate frame");
ss.format = PA_SAMPLE_S16NE;
ss.channels = 1;
ss.rate = ps_config_int(config, "samprate");
if ((s = pa_simple_new(NULL, "live_pulseaudio", PA_STREAM_RECORD, NULL,
"live", &ss, NULL, NULL, &err)) == NULL)
E_FATAL("Failed to connect to PulseAudio: %s\n",
pa_strerror(err));
if (signal(SIGINT, catch_sig) == SIG_ERR)
E_FATAL_SYSTEM("Failed to set SIGINT handler");
while (!global_done) {
const int16 *speech;
int prev_in_speech = ps_endpointer_in_speech(ep);
if (pa_simple_read(s, frame,
frame_size * sizeof(frame[0]), &err) < 0) {
E_ERROR("Error in pa_simple_read: %s\n",
pa_strerror(err));
break;
}
speech = ps_endpointer_process(ep, frame);
if (speech != NULL) {
const char *hyp;
if (!prev_in_speech) {
fprintf(stderr, "Speech start at %.2f\n",
ps_endpointer_speech_start(ep));
ps_start_utt(decoder);
}
if (ps_process_raw(decoder, speech, frame_size, FALSE, FALSE) < 0)
E_FATAL("ps_process_raw() failed\n");
if ((hyp = ps_get_hyp(decoder, NULL)) != NULL)
fprintf(stderr, "PARTIAL RESULT: %s\n", hyp);
if (!ps_endpointer_in_speech(ep)) {
fprintf(stderr, "Speech end at %.2f\n",
ps_endpointer_speech_end(ep));
ps_end_utt(decoder);
if ((hyp = ps_get_hyp(decoder, NULL)) != NULL)
printf("%s\n", hyp);
}
}
}
pa_simple_free(s);
free(frame);
ps_endpointer_free(ep);
ps_free(decoder);
ps_config_free(config);
return 0;
}
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