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-rw-r--r--tinycap.c43
1 files changed, 30 insertions, 13 deletions
diff --git a/tinycap.c b/tinycap.c
index 7429750..b9ae251 100644
--- a/tinycap.c
+++ b/tinycap.c
@@ -57,6 +57,7 @@ struct wav_header {
};
int capturing = 1;
+int prinfo = 1;
unsigned int capture_sample(FILE *file, unsigned int card, unsigned int device,
unsigned int channels, unsigned int rate,
@@ -81,17 +82,25 @@ int main(int argc, char **argv)
unsigned int period_size = 1024;
unsigned int period_count = 4;
enum pcm_format format;
+ int no_header = 0;
if (argc < 2) {
- fprintf(stderr, "Usage: %s file.wav [-D card] [-d device] [-c channels] "
- "[-r rate] [-b bits] [-p period_size] [-n n_periods]\n", argv[0]);
+ fprintf(stderr, "Usage: %s {file.wav | --} [-D card] [-d device] [-c channels] "
+ "[-r rate] [-b bits] [-p period_size] [-n n_periods]\n\n"
+ "Use -- for filename to send raw PCM to stdout\n", argv[0]);
return 1;
}
- file = fopen(argv[1], "wb");
- if (!file) {
- fprintf(stderr, "Unable to create file '%s'\n", argv[1]);
- return 1;
+ if (strcmp(argv[1],"--") == 0) {
+ file = stdout;
+ prinfo = 0;
+ no_header = 1;
+ } else {
+ file = fopen(argv[1], "wb");
+ if (!file) {
+ fprintf(stderr, "Unable to create file '%s'\n", argv[1]);
+ return 1;
+ }
}
/* parse command line arguments */
@@ -160,20 +169,26 @@ int main(int argc, char **argv)
header.data_id = ID_DATA;
/* leave enough room for header */
- fseek(file, sizeof(struct wav_header), SEEK_SET);
+ if (!no_header) {
+ fseek(file, sizeof(struct wav_header), SEEK_SET);
+ }
/* install signal handler and begin capturing */
signal(SIGINT, sigint_handler);
frames = capture_sample(file, card, device, header.num_channels,
header.sample_rate, format,
period_size, period_count);
- printf("Captured %d frames\n", frames);
+ if (prinfo) {
+ printf("Captured %d frames\n", frames);
+ }
/* write header now all information is known */
- header.data_sz = frames * header.block_align;
- header.riff_sz = header.data_sz + sizeof(header) - 8;
- fseek(file, 0, SEEK_SET);
- fwrite(&header, sizeof(struct wav_header), 1, file);
+ if (!no_header) {
+ header.data_sz = frames * header.block_align;
+ header.riff_sz = header.data_sz + sizeof(header) - 8;
+ fseek(file, 0, SEEK_SET);
+ fwrite(&header, sizeof(struct wav_header), 1, file);
+ }
fclose(file);
@@ -216,8 +231,10 @@ unsigned int capture_sample(FILE *file, unsigned int card, unsigned int device,
return 0;
}
- printf("Capturing sample: %u ch, %u hz, %u bit\n", channels, rate,
+ if (prinfo) {
+ printf("Capturing sample: %u ch, %u hz, %u bit\n", channels, rate,
pcm_format_to_bits(format));
+ }
while (capturing && !pcm_read(pcm, buffer, size)) {
if (fwrite(buffer, 1, size, file) != size) {