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/*
* Copyright 1994-2022 Olivier Girondel
*
* This file is part of lebiniou.
*
* lebiniou is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* lebiniou is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with lebiniou. If not, see <http://www.gnu.org/licenses/>.
*/
/* Use the newer ALSA API */
#define ALSA_PCM_NEW_HW_PARAMS_API
#include <alsa/asoundlib.h>
#include "context.h"
#include "pthread_utils.h"
uint32_t options = BO_NONE;
uint32_t version = 0;
static snd_pcm_t *pcm_handle = NULL;
static snd_pcm_stream_t stream = SND_PCM_STREAM_CAPTURE;
static snd_pcm_hw_params_t *hwparams = NULL;
#define DEFAULT_PCM_NAME "default"
static unsigned int rate = 44100, exact_rate;
static int size;
static snd_pcm_uframes_t frames;
static int dir;
static char *data = NULL;
int8_t
create(Context_t *ctx)
{
frames = Context_get_input_size(ctx);
const char *pcm_name = NULL;
if (NULL == (pcm_name = getenv("LEBINIOU_ALSA_PCM"))) {
pcm_name = DEFAULT_PCM_NAME;
}
VERBOSE(printf("[+] %s: using capture device: %s\n", __FILE__, pcm_name));
snd_pcm_hw_params_alloca(&hwparams);
if (snd_pcm_open(&pcm_handle, pcm_name, stream, 0) < 0) {
xerror("error opening PCM device %s\n", pcm_name);
} else {
VERBOSE(printf("[+] %s: %s ready for capture\n", __FILE__, pcm_name));
}
if (snd_pcm_hw_params_any(pcm_handle, hwparams) < 0) {
xerror("error configuring PCM device %s\n", pcm_name);
} else {
VERBOSE(printf("[+] %s: %s configured\n", __FILE__, pcm_name));
}
if (snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED) < 0) {
xerror("error setting access mode\n");
} else {
VERBOSE(printf("[+] %s: access mode set\n", __FILE__));
}
if (snd_pcm_hw_params_set_format(pcm_handle, hwparams, SND_PCM_FORMAT_S16_LE) < 0) {
xerror("error setting format\n");
} else {
VERBOSE(printf("[+] %s: format set\n", __FILE__));
}
exact_rate = rate;
if (snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &exact_rate, 0) < 0) {
xerror("error setting rate\n");
} else {
VERBOSE(printf("[+] %s: setting format: wanted %dHz, got %dHz\n", __FILE__, rate, exact_rate));
}
if (snd_pcm_hw_params_set_channels(pcm_handle, hwparams, 2) < 0) {
xerror("error setting channels\n");
} else {
VERBOSE(printf("[+] %s: channels set\n", __FILE__));
}
VERBOSE(printf("[+] %s: asking for %ld frames\n", __FILE__, frames));
if (snd_pcm_hw_params_set_period_size_near(pcm_handle, hwparams, &frames, &dir) < 0) {
xerror("error setting period size");
} else {
VERBOSE(printf("[+] %s: effectively using %ld frames\n", __FILE__, frames));
}
if (snd_pcm_hw_params(pcm_handle, hwparams) < 0) {
xerror("error setting HW params\n");
} else {
VERBOSE(printf("[+] %s: HW params set\n", __FILE__));
}
/* Use a buffer large enough to hold one period */
snd_pcm_hw_params_get_period_size(hwparams, &frames, &dir);
size = frames * 4; /* 2 bytes/sample, 2 channels */
data = xmalloc(size * sizeof(char));
ctx->input = Input_new(frames);
return 1;
}
void *
jthread(void *args)
{
Context_t *ctx = (Context_t *)args;
while (ctx->running) {
short *in = (short *)data;
while (snd_pcm_readi(pcm_handle, data, frames) < 0) {
snd_pcm_prepare(pcm_handle);
#ifdef DEBUG_ALSA
fprintf(stderr, "[!] %s: Buffer overrun\n", __FILE__);
#endif
}
if (!ctx->input->mute) {
if (!xpthread_mutex_lock(&ctx->input->mutex)) {
uint16_t n = 0;
for (uint16_t idx = 0; idx < frames; idx++) {
ctx->input->data[A_LEFT][idx] =
(float)(((float)(in[n])) / (float)-SHRT_MIN);
n++;
ctx->input->data[A_RIGHT][idx] =
(float)(((float)(in[n])) / (float)-SHRT_MIN);
n++;
}
Input_set(ctx->input, A_STEREO);
xpthread_mutex_unlock(&ctx->input->mutex);
}
}
}
return NULL;
}
void
destroy(Context_t *ctx)
{
Input_delete(ctx->input);
xfree(data);
snd_pcm_close(pcm_handle);
snd_config_update_free_global();
}
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