test/testkeys.c
author Sam Lantinga <slouken@libsdl.org>
Sun, 07 Jul 2019 09:10:56 -0700
changeset 12928 3c4a4b1077cd
parent 12503 806492103856
permissions -rw-r--r--
Fixed bug 4710 - audio/alsa: avoid configuring hardware parameters with only a single period

Anthony Pesch

The previous code first configured the period size using snd_pcm_hw_par-
ams_set_period_size_near. Then, it further narrowed the configuration
space by calling snd_pcm_hw_params_set_buffer_size_near using a buffer
size of 2 times the _requested_ period size in order to try and get a
configuration with only 2 periods. If the configured period size was
larger than the requested size, the second call could inadvertently
narrow the configuration space to contain only a single period.

Rather than fixing the call to snd_pcm_hw_params_set_buffer_size_near
to use a size of 2 times the configured period size, the code has been
changed to use snd_pcm_hw_params_set_periods_min in order to more
clearly explain the intent.
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/*
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  Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely.
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*/
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/* Print out all the scancodes we have, just to verify them */
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#include <stdio.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include "SDL.h"
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int
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main(int argc, char *argv[])
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{
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    SDL_Scancode scancode;
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    /* Enable standard application logging */
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    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
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    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
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        exit(1);
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    }
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    for (scancode = 0; scancode < SDL_NUM_SCANCODES; ++scancode) {
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        SDL_Log("Scancode #%d, \"%s\"\n", scancode,
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               SDL_GetScancodeName(scancode));
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    }
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    SDL_Quit();
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    return (0);
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}