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/* tinycap.c
**
** Copyright 2011, The Android Open Source Project
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
** * Neither the name of The Android Open Source Project nor the names of
** its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY The Android Open Source Project ``AS IS'' AND
** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
** ARE DISCLAIMED. IN NO EVENT SHALL The Android Open Source Project BE LIABLE
** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
** SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
** DAMAGE.
*/
#include <tinyalsa/asoundlib.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <signal.h>
#include <string.h>
#define ID_RIFF 0x46464952
#define ID_WAVE 0x45564157
#define ID_FMT 0x20746d66
#define ID_DATA 0x61746164
#define FORMAT_PCM 1
struct wav_header {
uint32_t riff_id;
uint32_t riff_sz;
uint32_t riff_fmt;
uint32_t fmt_id;
uint32_t fmt_sz;
uint16_t audio_format;
uint16_t num_channels;
uint32_t sample_rate;
uint32_t byte_rate;
uint16_t block_align;
uint16_t bits_per_sample;
uint32_t data_id;
uint32_t data_sz;
};
int capturing = 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,
unsigned int period_count);
void sigint_handler(int sig)
{
capturing = 0;
}
int main(int argc, char **argv)
{
FILE *file;
struct wav_header header;
unsigned int card = 0;
unsigned int device = 0;
unsigned int channels = 2;
unsigned int rate = 44100;
unsigned int bits = 16;
unsigned int frames;
unsigned int period_size = 1024;
unsigned int period_count = 4;
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]);
return 1;
}
file = fopen(argv[1], "wb");
if (!file) {
fprintf(stderr, "Unable to create file '%s'\n", argv[1]);
return 1;
}
/* parse command line arguments */
argv += 2;
while (*argv) {
if (strcmp(*argv, "-d") == 0) {
argv++;
if (*argv)
device = atoi(*argv);
} else if (strcmp(*argv, "-c") == 0) {
argv++;
if (*argv)
channels = atoi(*argv);
} else if (strcmp(*argv, "-r") == 0) {
argv++;
if (*argv)
rate = atoi(*argv);
} else if (strcmp(*argv, "-b") == 0) {
argv++;
if (*argv)
bits = atoi(*argv);
} else if (strcmp(*argv, "-D") == 0) {
argv++;
if (*argv)
card = atoi(*argv);
} else if (strcmp(*argv, "-p") == 0) {
argv++;
if (*argv)
period_size = atoi(*argv);
} else if (strcmp(*argv, "-n") == 0) {
argv++;
if (*argv)
period_count = atoi(*argv);
}
if (*argv)
argv++;
}
header.riff_id = ID_RIFF;
header.riff_sz = 0;
header.riff_fmt = ID_WAVE;
header.fmt_id = ID_FMT;
header.fmt_sz = 16;
header.audio_format = FORMAT_PCM;
header.num_channels = channels;
header.sample_rate = rate;
header.bits_per_sample = bits;
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);
/* 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,
period_size, period_count);
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);
fclose(file);
return 0;
}
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,
unsigned int period_count)
{
struct pcm_config config;
struct pcm *pcm;
char *buffer;
unsigned int size;
unsigned int bytes_read = 0;
config.channels = channels;
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.start_threshold = 0;
config.stop_threshold = 0;
config.silence_threshold = 0;
pcm = pcm_open(card, device, PCM_IN, &config);
if (!pcm || !pcm_is_ready(pcm)) {
fprintf(stderr, "Unable to open PCM device (%s)\n",
pcm_get_error(pcm));
return 0;
}
size = pcm_get_buffer_size(pcm);
buffer = malloc(size);
if (!buffer) {
fprintf(stderr, "Unable to allocate %d bytes\n", size);
free(buffer);
pcm_close(pcm);
return 0;
}
printf("Capturing sample: %u ch, %u hz, %u bit\n", channels, rate, bits);
while (capturing && !pcm_read(pcm, buffer, size)) {
if (fwrite(buffer, 1, size, file) != size) {
fprintf(stderr,"Error capturing sample\n");
break;
}
bytes_read += size;
}
free(buffer);
pcm_close(pcm);
return bytes_read / ((bits / 8) * channels);
}
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