diff options
Diffstat (limited to 'tinycap.c')
| -rw-r--r-- | tinycap.c | 76 |
1 files changed, 54 insertions, 22 deletions
@@ -57,10 +57,11 @@ 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, - unsigned int bits, unsigned int period_size, + enum pcm_format format, unsigned int period_size, unsigned int period_count); void sigint_handler(int sig) @@ -80,17 +81,26 @@ int main(int argc, char **argv) unsigned int frames; 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 */ @@ -137,26 +147,48 @@ int main(int argc, char **argv) header.audio_format = FORMAT_PCM; header.num_channels = channels; header.sample_rate = rate; - header.bits_per_sample = bits; + + switch (bits) { + case 32: + format = PCM_FORMAT_S32_LE; + break; + case 24: + format = PCM_FORMAT_S24_LE; + break; + case 16: + format = PCM_FORMAT_S16_LE; + break; + default: + fprintf(stderr, "%d bits is not supported.\n", bits); + return 1; + } + + header.bits_per_sample = pcm_format_to_bits(format); header.byte_rate = (header.bits_per_sample / 8) * channels * rate; header.block_align = channels * (header.bits_per_sample / 8); 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, header.bits_per_sample, + 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); @@ -165,7 +197,7 @@ int main(int argc, char **argv) unsigned int capture_sample(FILE *file, unsigned int card, unsigned int device, unsigned int channels, unsigned int rate, - unsigned int bits, unsigned int period_size, + enum pcm_format format, unsigned int period_size, unsigned int period_count) { struct pcm_config config; @@ -179,10 +211,7 @@ unsigned int capture_sample(FILE *file, unsigned int card, unsigned int device, config.rate = rate; config.period_size = period_size; config.period_count = period_count; - if (bits == 32) - config.format = PCM_FORMAT_S32_LE; - else if (bits == 16) - config.format = PCM_FORMAT_S16_LE; + config.format = format; config.start_threshold = 0; config.stop_threshold = 0; config.silence_threshold = 0; @@ -203,7 +232,10 @@ 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, bits); + 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) { @@ -215,6 +247,6 @@ unsigned int capture_sample(FILE *file, unsigned int card, unsigned int device, free(buffer); pcm_close(pcm); - return bytes_read / ((bits / 8) * channels); + return pcm_bytes_to_frames(pcm, bytes_read); } |