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-rw-r--r--src/send.c34
1 files changed, 32 insertions, 2 deletions
diff --git a/src/send.c b/src/send.c
index 02a2ca1..166a3b8 100644
--- a/src/send.c
+++ b/src/send.c
@@ -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)
{