268 lines
8.0 KiB
C
268 lines
8.0 KiB
C
/* tinycap.c
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**
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** Copyright 2011, The Android Open Source Project
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in the
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** documentation and/or other materials provided with the distribution.
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** * Neither the name of The Android Open Source Project nor the names of
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** its contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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** THIS SOFTWARE IS PROVIDED BY The Android Open Source Project ``AS IS'' AND
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** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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** ARE DISCLAIMED. IN NO EVENT SHALL The Android Open Source Project BE LIABLE
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** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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** SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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** DAMAGE.
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*/
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#include <tinyalsa/asoundlib.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <signal.h>
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#include <string.h>
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#include <limits.h>
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#define OPTPARSE_IMPLEMENTATION
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#include "optparse.h"
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#define ID_RIFF 0x46464952
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#define ID_WAVE 0x45564157
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#define ID_FMT 0x20746d66
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#define ID_DATA 0x61746164
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#define FORMAT_PCM 1
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struct wav_header {
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uint32_t riff_id;
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uint32_t riff_sz;
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uint32_t riff_fmt;
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uint32_t fmt_id;
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uint32_t fmt_sz;
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uint16_t audio_format;
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uint16_t num_channels;
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uint32_t sample_rate;
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uint32_t byte_rate;
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uint16_t block_align;
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uint16_t bits_per_sample;
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uint32_t data_id;
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uint32_t data_sz;
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};
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int capturing = 1;
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int prinfo = 1;
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unsigned int capture_sample(FILE *file, unsigned int card, unsigned int device,
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unsigned int channels, unsigned int rate,
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enum pcm_format format, unsigned int period_size,
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unsigned int period_count, unsigned int capture_time);
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void sigint_handler(int sig)
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{
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if (sig == SIGINT){
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capturing = 0;
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}
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}
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int main(int argc, char **argv)
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{
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FILE *file;
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struct wav_header header;
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unsigned int card = 0;
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unsigned int device = 0;
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unsigned int channels = 2;
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unsigned int rate = 48000;
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unsigned int bits = 16;
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unsigned int frames;
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unsigned int period_size = 1024;
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unsigned int period_count = 4;
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unsigned int capture_time = UINT_MAX;
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enum pcm_format format;
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int no_header = 0, c;
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struct optparse opts;
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if (argc < 2) {
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fprintf(stderr, "Usage: %s {file.wav | --} [-D card] [-d device] [-c channels] "
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"[-r rate] [-b bits] [-p period_size] [-n n_periods] [-t time_in_seconds]\n\n"
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"Use -- for filename to send raw PCM to stdout\n", argv[0]);
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return 1;
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}
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if (strcmp(argv[1],"--") == 0) {
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file = stdout;
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prinfo = 0;
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no_header = 1;
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} else {
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file = fopen(argv[1], "wb");
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if (!file) {
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fprintf(stderr, "Unable to create file '%s'\n", argv[1]);
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return 1;
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}
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}
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/* parse command line arguments */
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optparse_init(&opts, argv + 1);
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while ((c = optparse(&opts, "D:d:c:r:b:p:n:t:")) != -1) {
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switch (c) {
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case 'd':
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device = atoi(opts.optarg);
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break;
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case 'c':
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channels = atoi(opts.optarg);
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break;
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case 'r':
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rate = atoi(opts.optarg);
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break;
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case 'b':
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bits = atoi(opts.optarg);
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break;
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case 'D':
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card = atoi(opts.optarg);
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break;
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case 'p':
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period_size = atoi(opts.optarg);
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break;
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case 'n':
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period_count = atoi(opts.optarg);
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break;
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case 't':
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capture_time = atoi(opts.optarg);
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break;
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case '?':
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fprintf(stderr, "%s\n", opts.errmsg);
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return EXIT_FAILURE;
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}
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}
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header.riff_id = ID_RIFF;
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header.riff_sz = 0;
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header.riff_fmt = ID_WAVE;
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header.fmt_id = ID_FMT;
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header.fmt_sz = 16;
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header.audio_format = FORMAT_PCM;
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header.num_channels = channels;
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header.sample_rate = rate;
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switch (bits) {
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case 32:
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format = PCM_FORMAT_S32_LE;
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break;
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case 24:
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format = PCM_FORMAT_S24_LE;
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break;
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case 16:
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format = PCM_FORMAT_S16_LE;
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break;
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default:
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fprintf(stderr, "%u bits is not supported.\n", bits);
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fclose(file);
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return 1;
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}
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header.bits_per_sample = pcm_format_to_bits(format);
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header.byte_rate = (header.bits_per_sample / 8) * channels * rate;
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header.block_align = channels * (header.bits_per_sample / 8);
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header.data_id = ID_DATA;
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/* leave enough room for header */
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if (!no_header) {
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fseek(file, sizeof(struct wav_header), SEEK_SET);
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}
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/* install signal handler and begin capturing */
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signal(SIGINT, sigint_handler);
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frames = capture_sample(file, card, device, header.num_channels,
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header.sample_rate, format,
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period_size, period_count, capture_time);
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if (prinfo) {
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printf("Captured %u frames\n", frames);
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}
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/* write header now all information is known */
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if (!no_header) {
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header.data_sz = frames * header.block_align;
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header.riff_sz = header.data_sz + sizeof(header) - 8;
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fseek(file, 0, SEEK_SET);
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fwrite(&header, sizeof(struct wav_header), 1, file);
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}
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fclose(file);
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return 0;
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}
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unsigned int capture_sample(FILE *file, unsigned int card, unsigned int device,
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unsigned int channels, unsigned int rate,
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enum pcm_format format, unsigned int period_size,
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unsigned int period_count, unsigned int capture_time)
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{
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struct pcm_config config;
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struct pcm *pcm;
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char *buffer;
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unsigned int size;
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unsigned int frames_read;
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unsigned int total_frames_read;
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unsigned int bytes_per_frame;
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memset(&config, 0, sizeof(config));
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config.channels = channels;
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config.rate = rate;
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config.period_size = period_size;
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config.period_count = period_count;
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config.format = format;
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config.start_threshold = 0;
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config.stop_threshold = 0;
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config.silence_threshold = 0;
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pcm = pcm_open(card, device, PCM_IN, &config);
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if (!pcm || !pcm_is_ready(pcm)) {
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fprintf(stderr, "Unable to open PCM device (%s)\n",
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pcm_get_error(pcm));
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return 0;
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}
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size = pcm_frames_to_bytes(pcm, pcm_get_buffer_size(pcm));
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buffer = malloc(size);
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if (!buffer) {
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fprintf(stderr, "Unable to allocate %u bytes\n", size);
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pcm_close(pcm);
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return 0;
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}
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if (prinfo) {
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printf("Capturing sample: %u ch, %u hz, %u bit\n", channels, rate,
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pcm_format_to_bits(format));
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}
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bytes_per_frame = pcm_frames_to_bytes(pcm, 1);
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total_frames_read = 0;
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frames_read = 0;
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while (capturing) {
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frames_read = pcm_readi(pcm, buffer, pcm_get_buffer_size(pcm));
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total_frames_read += frames_read;
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if ((total_frames_read / rate) >= capture_time) {
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capturing = 0;
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}
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if (fwrite(buffer, bytes_per_frame, frames_read, file) != frames_read) {
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fprintf(stderr,"Error capturing sample\n");
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break;
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}
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}
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free(buffer);
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pcm_close(pcm);
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return total_frames_read;
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}
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