test/testbounds.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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#include "SDL.h"
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int main(int argc, char **argv)
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{
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    int total, i;
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    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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        SDL_Log("SDL_Init(SDL_INIT_VIDEO) failed: %s", SDL_GetError());
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        return 1;
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    }
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    total = SDL_GetNumVideoDisplays();
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    for (i = 0; i < total; i++) {
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        SDL_Rect bounds = { -1,-1,-1,-1 }, usable = { -1,-1,-1,-1 };
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        SDL_GetDisplayBounds(i, &bounds);
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        SDL_GetDisplayUsableBounds(i, &usable);
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        SDL_Log("Display #%d ('%s'): bounds={(%d,%d),%dx%d}, usable={(%d,%d),%dx%d}",
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                i, SDL_GetDisplayName(i),
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                bounds.x, bounds.y, bounds.w, bounds.h,
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                usable.x, usable.y, usable.w, usable.h);
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    }
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    SDL_Quit();
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    return 0;
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}
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/* vi: set ts=4 sw=4 expandtab: */
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