test/testhotplug.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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/* Simple program to test the SDL joystick hotplugging */
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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 "SDL.h"
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#if !defined SDL_JOYSTICK_DISABLED && !defined SDL_HAPTIC_DISABLED
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int
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main(int argc, char *argv[])
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{
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    SDL_Joystick *joystick = NULL;
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    SDL_Haptic *haptic = NULL;
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    SDL_JoystickID instance = -1;
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    SDL_bool keepGoing = SDL_TRUE;
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    int i;
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    SDL_bool enable_haptic = SDL_TRUE;
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    Uint32 init_subsystems = SDL_INIT_VIDEO | SDL_INIT_JOYSTICK;
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    for (i = 1; i < argc; ++i) {
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        if (SDL_strcasecmp(argv[i], "--nohaptic") == 0) {
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            enable_haptic = SDL_FALSE;
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        }
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    }
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    if(enable_haptic) {
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        init_subsystems |= SDL_INIT_HAPTIC;
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    }
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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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    SDL_SetHint(SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS, "1");
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    /* Initialize SDL (Note: video is required to start event loop) */
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    if (SDL_Init(init_subsystems) < 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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    /*
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    //SDL_CreateWindow("Dummy", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 128, 128, 0);
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    */
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    SDL_Log("There are %d joysticks at startup\n", SDL_NumJoysticks());
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    if (enable_haptic)
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        SDL_Log("There are %d haptic devices at startup\n", SDL_NumHaptics());
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    while(keepGoing)
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    {
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        SDL_Event event;
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        while(SDL_PollEvent(&event))
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        {
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            switch(event.type)
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            {
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                case SDL_QUIT:
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                    keepGoing = SDL_FALSE;
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                    break;
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                case SDL_JOYDEVICEADDED:
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                    if (joystick != NULL)
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                    {
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                        SDL_Log("Only one joystick supported by this test\n");
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                    }
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                    else
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                    {
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                        joystick = SDL_JoystickOpen(event.jdevice.which);
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                        instance = SDL_JoystickInstanceID(joystick);
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                        SDL_Log("Joy Added  : %d : %s\n", event.jdevice.which, SDL_JoystickName(joystick));
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                        if (enable_haptic)
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                        {
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                            if (SDL_JoystickIsHaptic(joystick))
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                            {
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                                haptic = SDL_HapticOpenFromJoystick(joystick);
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                                if (haptic)
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                                {
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                                    SDL_Log("Joy Haptic Opened\n");
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                                    if (SDL_HapticRumbleInit( haptic ) != 0)
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                                    {
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                                        SDL_Log("Could not init Rumble!: %s\n", SDL_GetError());
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                                        SDL_HapticClose(haptic);
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                                        haptic = NULL;
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                                    }
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                                } else {
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                                    SDL_Log("Joy haptic open FAILED!: %s\n", SDL_GetError());
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                                }
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                            }
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                            else
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                            {
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                                SDL_Log("No haptic found\n");
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                            }
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                        }
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                    }
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                    break;
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                case SDL_JOYDEVICEREMOVED:
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                    if (instance == event.jdevice.which)
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                    {
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                        SDL_Log("Joy Removed: %d\n", event.jdevice.which);
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                        instance = -1;
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                        if(enable_haptic && haptic)
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                        {
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                            SDL_HapticClose(haptic);
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                            haptic = NULL;
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                        }
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                        SDL_JoystickClose(joystick);
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                        joystick = NULL;
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                    } else {
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                        SDL_Log("Unknown joystick diconnected\n");
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                    }
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                    break;
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                case SDL_JOYAXISMOTION:
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/*
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//                    SDL_Log("Axis Move: %d\n", event.jaxis.axis);
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*/
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                    if (enable_haptic)
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                        SDL_HapticRumblePlay(haptic, 0.25, 250);
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                    break;
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                case SDL_JOYBUTTONDOWN:
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                    SDL_Log("Button Press: %d\n", event.jbutton.button);
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                    if(enable_haptic && haptic)
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                    {
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                        SDL_HapticRumblePlay(haptic, 0.25, 250);
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                    }
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                    if (event.jbutton.button == 0) {
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                        SDL_Log("Exiting due to button press of button 0\n");
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                        keepGoing = SDL_FALSE;
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                    }
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                    break;
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                case SDL_JOYBUTTONUP:
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                    SDL_Log("Button Release: %d\n", event.jbutton.button);
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                    break;
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            }
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        }
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    }
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    SDL_Quit();
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    return 0;
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}
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#else
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int
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main(int argc, char *argv[])
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{
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    SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL compiled without Joystick and haptic support.\n");
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    return 1;
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}
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#endif