/* tinyhostless.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.
*/
/* Playback data to a PCM device recorded from a capture PCM device. */
#include <tinyalsa/asoundlib.h>
#include <errno.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <signal.h>
#include <time.h>
#include <unistd.h>
/* Used when that particular device isn't opened. */
#define TINYHOSTLESS_DEVICE_UNDEFINED 255
static int close_h = 0;
int play_sample(unsigned int card, unsigned int p_device,
unsigned int c_device, unsigned int channels,
unsigned int rate, unsigned int bits, unsigned int period_size,
unsigned int period_count, unsigned int play_cap_time,
int do_loopback);
static void stream_close(int sig)
{
/* allow the stream to be closed gracefully */
signal(sig, SIG_IGN);
close_h = 1;
}
int main(int argc, char **argv)
{
unsigned int card = 0;
unsigned int p_device = TINYHOSTLESS_DEVICE_UNDEFINED;
unsigned int c_device = TINYHOSTLESS_DEVICE_UNDEFINED;
unsigned int period_size = 192;
unsigned int period_count = 4;
unsigned int number_bits = 16;
unsigned int num_channels = 2;
unsigned int sample_rate = 48000;
unsigned int play_cap_time = 0;
unsigned int do_loopback = 0;
if (argc < 2) {
fprintf(stderr, "Usage: %s [-D card] [-P playback device]"
" [-C capture device] [-p period_size] [-n n_periods]"
" [-c num_channels] [-r sample_rate] [-l]"
" [-T playback/capture time]\n\n"
"Used to enable 'hostless' mode for audio devices with a DSP back-end.\n"
"Alternatively, specify '-l' for loopback mode: this program will read\n"
"from the capture device and write to the playback device.\n",
argv[0]);
return 1;
}
/* parse command line arguments */
argv += 1;
while (*argv) {
if (strcmp(*argv, "-P") == 0) {
argv++;
if (*argv)
p_device = atoi(*argv);
}
if (strcmp(*argv, "-C") == 0) {
argv++;
if (*argv)
c_device = atoi(*argv);
}
if (strcmp(*argv, "-p") == 0) {
argv++;
if (*argv)
period_size = atoi(*argv);
}
if (strcmp(*argv, "-n") == 0) {
argv++;
if (*argv)
period_count = atoi(*argv);
}
if (strcmp(*argv, "-c") == 0) {
argv++;
if (*argv)
num_channels = atoi(*argv);
}
if (strcmp(*argv, "-r") == 0) {
argv++;
if (*argv)
sample_rate = atoi(*argv);
}
if (strcmp(*argv, "-T") == 0) {
argv++;
if (*argv)
play_cap_time = atoi(*argv);
}
if (strcmp(*argv, "-D") == 0) {
argv++;
if (*argv)
card = atoi(*argv);
}
if (strcmp(*argv, "-l") == 0) {
do_loopback = 1;
}
if (*argv)
argv++;
}
if (p_device == TINYHOSTLESS_DEVICE_UNDEFINED &&
c_device == TINYHOSTLESS_DEVICE_UNDEFINED) {
fprintf(stderr, "Specify at least one of -C (capture device) or -P (playback device).\n");
return EINVAL;
}
if (do_loopback && (p_device == TINYHOSTLESS_DEVICE_UNDEFINED ||
c_device == TINYHOSTLESS_DEVICE_UNDEFINED)) {
fprintf(stderr, "Loopback requires both playback and capture devices.\n");
return EINVAL;
}
return play_sample(card, p_device, c_device, num_channels, sample_rate,
number_bits, period_size, period_count, play_cap_time,
do_loopback);
}
static int check_param(struct pcm_params *params, unsigned int param,
unsigned int value, char *param_name, char *param_unit)
{
unsigned int min;
unsigned int max;
int is_within_bounds = 1;
min = pcm_params_get_min(params, param);
if (value < min) {
fprintf(stderr, "%s is %u%s, device only supports >= %u%s\n", param_name, value,
param_unit, min, param_unit);
is_within_bounds = 0;
}
max = pcm_params_get_max(params, param);
if (value > max) {
fprintf(stderr, "%s is %u%s, device only supports <= %u%s\n", param_name, value,
param_unit, max, param_unit);
is_within_bounds = 0;
}
return is_within_bounds;
}
static int check_params(unsigned int card, unsigned int device, unsigned int direction,
const struct pcm_config *config)
{
struct pcm_params *params;
int can_play;
int bits;
params = pcm_params_get(card, device, direction);
if (params == NULL) {
fprintf(stderr, "Unable to open PCM %s device %u.\n",
direction == PCM_OUT ? "playback" : "capture", device);
return 0;
}
switch (config->format) {
case PCM_FORMAT_S32_LE:
bits = 32;
break;
case PCM_FORMAT_S24_3LE:
bits = 24;
break;
case PCM_FORMAT_S16_LE:
bits = 16;
break;
default:
fprintf(stderr, "Invalid format: %u", config->format);
return 0;
}
can_play = check_param(params, PCM_PARAM_RATE, config->rate, "Sample rate", "Hz");
can_play &= check_param(params, PCM_PARAM_CHANNELS, config->channels, "Sample", " channels");
can_play &= check_param(params, PCM_PARAM_SAMPLE_BITS, bits, "Bitrate", " bits");
can_play &= check_param(params, PCM_PARAM_PERIOD_SIZE, config->period_size, "Period size", " frames");
can_play &= check_param(params, PCM_PARAM_PERIODS, config->period_count, "Period count", " periods");
pcm_params_free(params);
return can_play;
}
int play_sample(unsigned int card, unsigned int p_device,
unsigned int c_device, unsigned int channels,
unsigned int rate, unsigned int bits, unsigned int period_size,
unsigned int period_count, unsigned int play_cap_time,
int do_loopback)
{
struct pcm_config config;
struct pcm *pcm_play =NULL, *pcm_cap=NULL;
unsigned int count =0;
char *buffer = NULL;
int size = 0;
int rc = 0;
struct timespec end;
struct timespec now;
memset(&config, 0, sizeof(config));
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 == 24)
config.format = PCM_FORMAT_S24_3LE;
else if (bits == 16)
config.format = PCM_FORMAT_S16_LE;
config.start_threshold = 0;
config.stop_threshold = 0;
config.avail_min = 0;
if(p_device < TINYHOSTLESS_DEVICE_UNDEFINED ) {
if (!check_params(card, p_device, PCM_OUT, &config))
return EINVAL;
pcm_play = pcm_open(card, p_device, PCM_OUT, &config);
if (!pcm_play || !pcm_is_ready(pcm_play)) {
fprintf(stderr, "Unable to open PCM playback device %u (%s)\n",
p_device, pcm_get_error(pcm_play));
return errno;
}
}
if (c_device < TINYHOSTLESS_DEVICE_UNDEFINED ) {
if (!check_params(card, c_device, PCM_IN, &config))
return EINVAL;
pcm_cap = pcm_open(card, c_device, PCM_IN, &config);
if (!pcm_cap || !pcm_is_ready(pcm_cap)) {
fprintf(stderr, "Unable to open PCM capture device %u (%s)\n",
c_device, pcm_get_error(pcm_cap));
if (pcm_play != NULL ) pcm_close(pcm_play);
return errno;
}
}
printf("%s: Playing device %u, Capture Device %u\n",
do_loopback ? "Loopback" : "Hostless", p_device, c_device);
printf("Sample: %u ch, %u hz, %u bit\n", channels, rate, bits);
if (play_cap_time)
printf("Duration in sec: %u\n", play_cap_time);
else
printf("Duration in sec: forever\n");
if (do_loopback) {
size = pcm_frames_to_bytes(pcm_cap, pcm_get_buffer_size(pcm_cap));
buffer = malloc(size);
if (!buffer) {
fprintf(stderr, "Unable to allocate %d bytes\n", size);
pcm_close(pcm_play);
pcm_close(pcm_cap);
return ENOMEM;
}
}
/* catch ctrl-c to shutdown cleanly */
signal(SIGINT, stream_close);
signal(SIGHUP, stream_close);
signal(SIGTERM, stream_close);
if (pcm_cap != NULL) pcm_start(pcm_cap);
if (pcm_play != NULL) pcm_start(pcm_play);
clock_gettime(CLOCK_MONOTONIC, &now);
end.tv_sec = now.tv_sec + play_cap_time;
end.tv_nsec = now.tv_nsec;
do {
if (do_loopback) {
if (pcm_read(pcm_cap, buffer, size)) {
fprintf(stderr, "Unable to read from PCM capture device %u (%s)\n",
c_device, pcm_get_error(pcm_cap));
rc = errno;
break;
}
if (pcm_write(pcm_play, buffer, size)) {
fprintf(stderr, "Unable to write to PCM playback device %u (%s)\n",
p_device, pcm_get_error(pcm_play));
break;
}
} else {
usleep(100000);
}
if (play_cap_time) {
clock_gettime(CLOCK_MONOTONIC, &now);
if (now.tv_sec > end.tv_sec ||
(now.tv_sec == end.tv_sec && now.tv_nsec >= end.tv_nsec))
break;
}
} while(!close_h);
if (buffer)
free(buffer);
if (pcm_play != NULL)
pcm_close(pcm_play);
if (pcm_cap != NULL)
pcm_close(pcm_cap);
return rc;
}