test/testrumble.c
author Sam Lantinga <slouken@libsdl.org>
Sun, 07 Jul 2019 09:10:56 -0700
changeset 12928 3c4a4b1077cd
parent 12503 806492103856
child 13070 d953f28d33e3
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.
     1 /*
     2   Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
     3 
     4   This software is provided 'as-is', without any express or implied
     5   warranty.  In no event will the authors be held liable for any damages
     6   arising from the use of this software.
     7 
     8   Permission is granted to anyone to use this software for any purpose,
     9   including commercial applications, and to alter it and redistribute it
    10   freely.
    11 */
    12 /*
    13 Copyright (c) 2011, Edgar Simo Serra
    14 All rights reserved.
    15 
    16 Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
    17 
    18     * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
    19     * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
    20     * Neither the name of the Simple Directmedia Layer (SDL) nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
    21 
    22 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    23 */
    24 
    25 /*
    26  * includes
    27  */
    28 #include <stdlib.h>
    29 #include <string.h>             /* strstr */
    30 #include <ctype.h>              /* isdigit */
    31 
    32 #include "SDL.h"
    33 
    34 #ifndef SDL_HAPTIC_DISABLED
    35 
    36 static SDL_Haptic *haptic;
    37 
    38 
    39 /**
    40  * @brief The entry point of this force feedback demo.
    41  * @param[in] argc Number of arguments.
    42  * @param[in] argv Array of argc arguments.
    43  */
    44 int
    45 main(int argc, char **argv)
    46 {
    47     int i;
    48     char *name;
    49     int index;
    50 
    51     /* Enable standard application logging */
    52     SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
    53 
    54     name = NULL;
    55     index = -1;
    56     if (argc > 1) {
    57         size_t l;
    58         name = argv[1];
    59         if ((strcmp(name, "--help") == 0) || (strcmp(name, "-h") == 0)) {
    60             SDL_Log("USAGE: %s [device]\n"
    61                    "If device is a two-digit number it'll use it as an index, otherwise\n"
    62                    "it'll use it as if it were part of the device's name.\n",
    63                    argv[0]);
    64             return 0;
    65         }
    66 
    67         l = SDL_strlen(name);
    68         if ((l < 3) && SDL_isdigit(name[0]) && ((l == 1) || SDL_isdigit(name[1]))) {
    69             index = SDL_atoi(name);
    70             name = NULL;
    71         }
    72     }
    73 
    74     /* Initialize the force feedbackness */
    75     SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER | SDL_INIT_JOYSTICK |
    76              SDL_INIT_HAPTIC);
    77     SDL_Log("%d Haptic devices detected.\n", SDL_NumHaptics());
    78     if (SDL_NumHaptics() > 0) {
    79         /* We'll just use index or the first force feedback device found */
    80         if (name == NULL) {
    81             i = (index != -1) ? index : 0;
    82         }
    83         /* Try to find matching device */
    84         else {
    85             for (i = 0; i < SDL_NumHaptics(); i++) {
    86                 if (strstr(SDL_HapticName(i), name) != NULL)
    87                     break;
    88             }
    89 
    90             if (i >= SDL_NumHaptics()) {
    91                 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Unable to find device matching '%s', aborting.\n",
    92                        name);
    93                 return 1;
    94             }
    95         }
    96 
    97         haptic = SDL_HapticOpen(i);
    98         if (haptic == NULL) {
    99             SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Unable to create the haptic device: %s\n",
   100                    SDL_GetError());
   101             return 1;
   102         }
   103         SDL_Log("Device: %s\n", SDL_HapticName(i));
   104     } else {
   105         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "No Haptic devices found!\n");
   106         return 1;
   107     }
   108 
   109     /* We only want force feedback errors. */
   110     SDL_ClearError();
   111 
   112     if (SDL_HapticRumbleSupported(haptic) == SDL_FALSE) {
   113         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Rumble not supported!\n");
   114         return 1;
   115     }
   116     if (SDL_HapticRumbleInit(haptic) != 0) {
   117         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Failed to initialize rumble: %s\n", SDL_GetError());
   118         return 1;
   119     }
   120     SDL_Log("Playing 2 second rumble at 0.5 magnitude.\n");
   121     if (SDL_HapticRumblePlay(haptic, 0.5, 5000) != 0) {
   122        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Failed to play rumble: %s\n", SDL_GetError() );
   123        return 1;
   124     }
   125     SDL_Delay(2000);
   126     SDL_Log("Stopping rumble.\n");
   127     SDL_HapticRumbleStop(haptic);
   128     SDL_Delay(2000);
   129     SDL_Log("Playing 2 second rumble at 0.3 magnitude.\n");
   130     if (SDL_HapticRumblePlay(haptic, 0.3f, 5000) != 0) {
   131        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Failed to play rumble: %s\n", SDL_GetError() );
   132        return 1;
   133     }
   134     SDL_Delay(2000);
   135 
   136     /* Quit */
   137     if (haptic != NULL)
   138         SDL_HapticClose(haptic);
   139     SDL_Quit();
   140 
   141     return 0;
   142 }
   143 
   144 #else
   145 
   146 int
   147 main(int argc, char *argv[])
   148 {
   149     SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL compiled without Haptic support.\n");
   150     exit(1);
   151 }
   152 
   153 #endif