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235 lines
9.1 KiB
C
235 lines
9.1 KiB
C
/**
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* @file alsa_common.h
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* @author Martin Pulec <pulec@cesnet.cz>
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*/
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/*
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* Copyright (c) 2015-2019 CESNET, z. s. p. o.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, is permitted provided that the following conditions
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* are met:
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*
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* 1. 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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*
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* 2. 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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*
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* 3. Neither the name of CESNET nor the names of its contributors may be
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* used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef ALSA_COMMON_H
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#define ALSA_COMMON_H
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#include <alsa/asoundlib.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "debug.h"
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#include "utils/color_out.h"
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#include "types.h"
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static inline void audio_alsa_probe(struct device_info **available_devices,
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int *count,
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const char **whitelist,
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size_t whitelist_size)
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{
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void **hints;
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snd_device_name_hint(-1, "pcm", &hints);
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size_t device_count = 0;
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for (void **it = hints; *it != NULL; it++) device_count++;
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*available_devices = calloc(device_count + 1 , sizeof(struct device_info));
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strcpy((*available_devices)[0].id, "alsa");
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strcpy((*available_devices)[0].name, "Default Linux audio");
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*count = 1;
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for(void **it = hints; *it != NULL; it++){
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char *id = snd_device_name_get_hint(*it, "NAME");
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bool whitelisted = false;
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for(size_t i = 0; i < whitelist_size; i++){
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if(strstr(id, whitelist[i])){
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whitelisted = true;
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break;
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}
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}
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if(!whitelisted && whitelist_size > 0) {
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free(id);
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continue;
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}
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strcpy((*available_devices)[*count].id, "alsa:");
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strncat((*available_devices)[*count].id, id,
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sizeof (*available_devices)[*count].id -
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strlen((*available_devices)[*count].id) - 1);
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free(id);
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char *name = snd_device_name_get_hint(*it, "DESC");
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char *tok = name;
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while(tok){
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char *newline = strchr(tok, '\n');
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if(newline){
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*newline = '\0';
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strncat((*available_devices)[*count].name, tok,
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sizeof (*available_devices)[*count].name -
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strlen((*available_devices)[*count].name) - 1);
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strncat((*available_devices)[*count].name, " - ",
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sizeof (*available_devices)[*count].name -
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strlen((*available_devices)[*count].name) - 1);
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tok = newline + 1;
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} else {
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strncat((*available_devices)[*count].name, tok,
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sizeof (*available_devices)[*count].name -
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strlen((*available_devices)[*count].name) - 1);
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tok = NULL;
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}
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}
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free(name);
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(*count)++;
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}
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snd_device_name_free_hint(hints);
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}
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static inline void audio_alsa_help(void)
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{
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struct device_info *available_devices;
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int count;
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audio_alsa_probe(&available_devices, &count, NULL, 0);
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strcpy(available_devices[0].id, "alsa");
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strcpy(available_devices[0].name, "default ALSA device (same as \"alsa:default\")");
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for(int i = 0; i < count; i++){
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const char * const id = available_devices[i].id;
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color_out(COLOR_OUT_BOLD, "\t%s", id);
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for (int j = 0; j < 30 - (int) strlen(id); ++j) putchar(' ');
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printf(": %s\n", available_devices[i].name);
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}
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free(available_devices);
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}
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static const snd_pcm_format_t bps_to_snd_fmts[] = {
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[0] = SND_PCM_FORMAT_UNKNOWN,
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[1] = SND_PCM_FORMAT_U8,
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[2] = SND_PCM_FORMAT_S16_LE,
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[3] = SND_PCM_FORMAT_S24_3LE,
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[4] = SND_PCM_FORMAT_S32_LE,
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};
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/**
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* Finds equal or nearest higher sample rate that device supports. If none exist, pick highest
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* lower value.
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*
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* @returns sample rate, 0 if none was found
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*/
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static int get_rate_near(snd_pcm_t *handle, snd_pcm_hw_params_t *params, unsigned int approx_val) {
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int ret = 0;
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int dir = 0;
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int rc;
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unsigned int rate = approx_val;
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// try exact sample rate
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rc = snd_pcm_hw_params_set_rate_min(handle, params, &rate, &dir);
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if (rc != 0) {
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dir = 1;
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// or higher
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rc = snd_pcm_hw_params_set_rate_min(handle, params, &rate, &dir);
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}
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if (rc == 0) {
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// read the rate
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rc = snd_pcm_hw_params_get_rate_min(params, &rate, NULL);
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if (rc == 0) {
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ret = rate;
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}
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// restore configuration space
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rate = 0;
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dir = 1;
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rc = snd_pcm_hw_params_set_rate_min(handle, params, &rate, &dir);
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assert(rc == 0);
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}
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// we did not succeed, try lower sample rate
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if (ret == 0) {
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unsigned int rate = approx_val;
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dir = 0;
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unsigned int orig_max;
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rc = snd_pcm_hw_params_get_rate_max(params, &orig_max, NULL);
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assert(rc == 0);
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rc = snd_pcm_hw_params_set_rate_max(handle, params, &rate, &dir);
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if (rc != 0) {
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dir = -1;
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rc = snd_pcm_hw_params_set_rate_max(handle, params, &rate, &dir);
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}
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if (rc == 0) {
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rc = snd_pcm_hw_params_get_rate_max(params, &rate, NULL);
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if (rc == 0) {
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ret = rate;
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}
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// restore configuration space
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dir = 0;
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rc = snd_pcm_hw_params_set_rate_max(handle, params, &orig_max, &dir);
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assert(rc == 0);
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}
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}
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return ret;
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}
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static void print_alsa_device_info(snd_pcm_t *handle, const char *module_name) {
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snd_pcm_info_t *info;
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snd_pcm_info_alloca(&info);
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if (snd_pcm_info(handle, info) == 0) {
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log_msg(LOG_LEVEL_NOTICE, "%sUsing device: %s\n",
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module_name, snd_pcm_info_get_name(info));
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}
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}
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static const char *alsa_get_pcm_state_name(snd_pcm_state_t state) __attribute__((unused));
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static const char *alsa_get_pcm_state_name(snd_pcm_state_t state) {
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switch (state) {
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case SND_PCM_STATE_OPEN:
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return "Open";
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case SND_PCM_STATE_SETUP:
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return "Setup installed";
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case SND_PCM_STATE_PREPARED:
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return "Ready to start";
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case SND_PCM_STATE_RUNNING:
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return "Running";
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case SND_PCM_STATE_XRUN:
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return "Stopped: underrun (playback) or overrun (capture) detected";
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case SND_PCM_STATE_DRAINING:
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return "Draining: running (playback) or stopped (capture)";
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case SND_PCM_STATE_PAUSED:
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return "Paused";
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case SND_PCM_STATE_SUSPENDED:
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return "Hardware is suspended";
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case SND_PCM_STATE_DISCONNECTED:
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return "Hardware is disconnected";
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default:
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return "(unknown)";
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}
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}
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#endif // defined ALSA_COMMON_H
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