diff options
Diffstat (limited to 'tinycap.c')
| -rw-r--r-- | tinycap.c | 43 |
1 files changed, 30 insertions, 13 deletions
@@ -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) { |