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259 lines
8.0 KiB
259 lines
8.0 KiB
/* 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 <time.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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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 cap_time);
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void sigint_handler(int sig __unused)
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{
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capturing = 0;
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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 = 44100;
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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 cap_time = 0;
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enum pcm_format format;
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if (argc < 2) {
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fprintf(stderr, "Usage: %s file.wav [-D card] [-d device]"
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" [-c channels] [-r rate] [-b bits] [-p period_size]"
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" [-n n_periods] [-T capture time]\n", argv[0]);
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return 1;
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}
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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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/* parse command line arguments */
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argv += 2;
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while (*argv) {
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if (strcmp(*argv, "-d") == 0) {
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argv++;
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if (*argv)
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device = atoi(*argv);
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} else if (strcmp(*argv, "-c") == 0) {
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argv++;
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if (*argv)
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channels = atoi(*argv);
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} else if (strcmp(*argv, "-r") == 0) {
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argv++;
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if (*argv)
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rate = atoi(*argv);
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} else if (strcmp(*argv, "-b") == 0) {
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argv++;
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if (*argv)
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bits = atoi(*argv);
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} else if (strcmp(*argv, "-D") == 0) {
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argv++;
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if (*argv)
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card = atoi(*argv);
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} else if (strcmp(*argv, "-p") == 0) {
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argv++;
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if (*argv)
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period_size = atoi(*argv);
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} else if (strcmp(*argv, "-n") == 0) {
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argv++;
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if (*argv)
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period_count = atoi(*argv);
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} else if (strcmp(*argv, "-T") == 0) {
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argv++;
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if (*argv)
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cap_time = atoi(*argv);
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}
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if (*argv)
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argv++;
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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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fseek(file, sizeof(struct wav_header), SEEK_SET);
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/* install signal handler and begin capturing */
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signal(SIGINT, sigint_handler);
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signal(SIGHUP, sigint_handler);
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signal(SIGTERM, 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, cap_time);
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printf("Captured %u frames\n", frames);
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/* write header now all information is known */
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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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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 cap_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 bytes_read = 0;
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unsigned int frames = 0;
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struct timespec end;
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struct timespec now;
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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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free(buffer);
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pcm_close(pcm);
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return 0;
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}
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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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clock_gettime(CLOCK_MONOTONIC, &now);
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end.tv_sec = now.tv_sec + cap_time;
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end.tv_nsec = now.tv_nsec;
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while (capturing && !pcm_read(pcm, buffer, size)) {
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if (fwrite(buffer, 1, size, file) != size) {
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fprintf(stderr,"Error capturing sample\n");
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break;
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}
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bytes_read += size;
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if (cap_time) {
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clock_gettime(CLOCK_MONOTONIC, &now);
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if (now.tv_sec > end.tv_sec ||
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(now.tv_sec == end.tv_sec && now.tv_nsec >= end.tv_nsec))
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break;
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}
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}
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frames = pcm_bytes_to_frames(pcm, bytes_read);
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free(buffer);
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pcm_close(pcm);
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return frames;
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}
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