view test/checkkeys.c @ 2661:d38309be5178 gsoc2008_audio_resampling

The windowed sinc filter generation code seems to be working fine. The FIR filtering code is also now working reasonably well. Occasionally the FIR filter will pop, but setting the normalization factor lower seems to help this. I suspect the problem is in the fixed point multiply/add. I also have a hunch the zero stuffing/sample discarding code is not correct, and I'll look at that soon to get it sorted out.
author Aaron Wishnick <schnarf@gmail.com>
date Wed, 02 Jul 2008 08:04:50 +0000
parents 95586dfe1992
children 95352c671a6e
line wrap: on
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/* Simple program:  Loop, watching keystrokes
   Note that you need to call SDL_PollEvent() or SDL_WaitEvent() to 
   pump the event loop and catch keystrokes.
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "SDL.h"

/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
static void
quit(int rc)
{
    SDL_Quit();
    exit(rc);
}

static void
print_modifiers(void)
{
    int mod;
    printf(" modifiers:");
    mod = SDL_GetModState();
    if (!mod) {
        printf(" (none)");
        return;
    }
    if (mod & KMOD_LSHIFT)
        printf(" LSHIFT");
    if (mod & KMOD_RSHIFT)
        printf(" RSHIFT");
    if (mod & KMOD_LCTRL)
        printf(" LCTRL");
    if (mod & KMOD_RCTRL)
        printf(" RCTRL");
    if (mod & KMOD_LALT)
        printf(" LALT");
    if (mod & KMOD_RALT)
        printf(" RALT");
    if (mod & KMOD_LGUI)
        printf(" LGUI");
    if (mod & KMOD_RGUI)
        printf(" RGUI");
    if (mod & KMOD_NUM)
        printf(" NUM");
    if (mod & KMOD_CAPS)
        printf(" CAPS");
    if (mod & KMOD_MODE)
        printf(" MODE");
}

static void
PrintKey(SDL_keysym * sym, int pressed)
{
    /* Print the keycode, name and state */
    if (sym->sym) {
        printf("Key %s:  scancode %d = %s, keycode 0x%08X = %s ",
               pressed ? "pressed " : "released",
               sym->scancode,
               SDL_GetScancodeName(sym->scancode),
               sym->sym, SDL_GetKeyName(sym->sym));
    } else {
        printf("Unknown Key (scancode %d = %s) %s ",
               sym->scancode,
               SDL_GetScancodeName(sym->scancode),
               pressed ? "pressed" : "released");
    }

    /* Print the translated character, if one exists */
    if (sym->unicode) {
        /* Is it a control-character? */
        if (sym->unicode < ' ') {
            printf(" (^%c)", sym->unicode + '@');
        } else {
#ifdef UNICODE
            printf(" (%c)", sym->unicode);
#else
            /* This is a Latin-1 program, so only show 8-bits */
            if (!(sym->unicode & 0xFF00))
                printf(" (%c)", sym->unicode);
            else
                printf(" (0x%X)", sym->unicode);
#endif
        }
    }
    print_modifiers();
    printf("\n");
}

static void
PrintText(char *text)
{
    printf("Text: %s\n", text);
}

int
main(int argc, char *argv[])
{
    SDL_Event event;
    int done;
    Uint32 videoflags;

    /* Initialize SDL */
    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
        fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
        return (1);
    }

    videoflags = SDL_SWSURFACE;
    while (argc > 1) {
        --argc;
        if (argv[argc] && !strcmp(argv[argc], "-fullscreen")) {
            videoflags |= SDL_FULLSCREEN;
        } else {
            fprintf(stderr, "Usage: %s [-fullscreen]\n", argv[0]);
            quit(1);
        }
    }

    /* Set 640x480 video mode */
    if (SDL_SetVideoMode(640, 480, 0, videoflags) == NULL) {
        fprintf(stderr, "Couldn't set 640x480 video mode: %s\n",
                SDL_GetError());
        quit(2);
    }

    /* Watch keystrokes */
    done = 0;
    while (!done) {
        /* Check for events */
        SDL_WaitEvent(&event);
        switch (event.type) {
        case SDL_KEYDOWN:
            PrintKey(&event.key.keysym, 1);
            break;
        case SDL_KEYUP:
            PrintKey(&event.key.keysym, 0);
            break;
        case SDL_TEXTINPUT:
            PrintText(event.text.text);
            break;
        case SDL_MOUSEBUTTONDOWN:
            /* Any button press quits the app... */
        case SDL_QUIT:
            done = 1;
            break;
        default:
            break;
        }
    }

    SDL_Quit();
    return (0);
}