diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/send.c | 34 |
1 files changed, 32 insertions, 2 deletions
@@ -104,6 +104,15 @@ static int data_n; */ static int code_n; +/** + * File descriptor to write the audio to (with any metadata) + * rather than sending it to the audio subsystem. + * + * This is available for developers of the receiver. + * It is not intend to be used for anything else. + */ +static int output_fd = -1; + /** @@ -178,12 +187,28 @@ static int send_nibble(int n) snd_pcm_sframes_t frames; int r; + if (output_fd >= 0) + { + char* buf = (char*)buffer; + size_t ptr = 0; + ssize_t wrote; + while (ptr < N) + { + wrote = write(output_fd, buf + ptr, N - ptr); + if (wrote < 0) + return -1; + ptr += (size_t)write; + } + return 0; + } + r = frames = snd_pcm_writei(sound_handle, buffer, N); if (frames < 0) r = frames = snd_pcm_recover(sound_handle, r, 0 /* do not print error reason? */); if (r < 0) { fprintf(stderr, "%s: snd_pcm_writei: %s\n", argv0, snd_strerror(r)); + errno = 0; return -1; } if ((r > 0) && ((size_t)r < N)) @@ -397,12 +422,13 @@ int main(int argc, char* argv[]) argv0 = argc ? argv[0] : ""; for (;;) { - r = getopt (argc, argv, "f:pr:"); + r = getopt (argc, argv, "f:pr:o:"); if (r == -1) break; else if (r == 'f') use_redundant_freq = 1, redundant_freq_mul = atof(optarg); else if (r == 'p') use_extra_parity = 1; else if (r == 'r') parity = atoi(optarg); + else if (r == 'o') output_fd = atoi(optarg); else if (r != '?') abort(); } @@ -429,6 +455,8 @@ int main(int argc, char* argv[]) code = alloca(code_n * sizeof(*code)); /* Set up audio. */ + if (output_fd < 0) + goto no_audio; r = snd_pcm_open(&sound_handle, "default", SND_PCM_STREAM_PLAYBACK, 0); if (r < 0) return fprintf(stderr, "%s: snd_pcm_open: %s\n", *argv, snd_strerror(r)), 1; @@ -437,6 +465,7 @@ int main(int argc, char* argv[]) SAMPLE_RATE, 1 /* allow resampling? */, LATENCY); if (r < 0) return fprintf(stderr, "%s: snd_pcm_set_params: %s\n", *argv, snd_strerror(r)), 1; + no_audio: /* Send message. */ if (isatty(STDIN_FILENO)) @@ -459,7 +488,8 @@ int main(int argc, char* argv[]) if (errno) perror(argv0); cleanup: - snd_pcm_close(sound_handle); + if (output_fd >= 0) + snd_pcm_close(sound_handle); /* Mark aborted transmission. */ if (rc) { |