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C example with ffmpeg #1162

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4773b56
c ffmpeg example
fabiopallini Sep 30, 2022
ce66bb5
add argv check
fabiopallini Sep 30, 2022
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57 changes: 57 additions & 0 deletions c/test_vosk_ffmpeg.c
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Original file line number Diff line number Diff line change
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#include <vosk_api.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>

int main(int argc, char *argv[]) {
if(argc == 1) {
printf("missing .mp4 filename\n");
return 0;
}
int p[2];
pid_t pid;
char data[4000];

VoskModel *model = vosk_model_new("model");
VoskRecognizer *recognizer = vosk_recognizer_new(model, 16000.0);
vosk_recognizer_set_words(recognizer, 1);
int final;

if (pipe(p)==-1)
fprintf(stderr, "%s\n", "pipe error");

if ((pid = fork()) == -1)
fprintf(stderr, "%s\n", "fork error");

if(pid == 0) {
dup2(p[1], STDOUT_FILENO);
close(p[0]);
close(p[1]);
execl("/usr/bin/ffmpeg", "ffmpeg", "-loglevel", "quiet",
"-i", argv[1], "-ar", "16000", "-ac", "1", "-f", "s16le", "-", NULL);
perror("error:");
}
else {
close(p[1]);
int nbytes;
//printf("Output: %s\n", data);

while ((nbytes = read(p[0], data, sizeof(data))) != 0){
final = vosk_recognizer_accept_waveform(recognizer, data, nbytes);
if (final) {
printf("%s\n", vosk_recognizer_result(recognizer));
}
else {
printf("%s\n", vosk_recognizer_partial_result(recognizer));
}
}

printf("%s\n", vosk_recognizer_final_result(recognizer));
vosk_recognizer_free(recognizer);
vosk_model_free(model);
wait(NULL);
}

return 0;
}