src/audio/dummy/SDL_dummyaudio.c
author Sam Lantinga
Mon, 09 Jan 2017 11:58:01 -0800
changeset 10802 6afc9b833867
parent 10737 3406a0f8b041
child 11811 5d94cb6b24d3
permissions -rw-r--r--
We only need the first few keymaps corresponding to the following constants:
K_NORMTAB, K_SHIFTTAB, K_ALTTAB, K_ALTSHIFTTAB

In the normal case we'll load all the keymaps from the kernel, but this reduces the size of the SDL library for the fallback case when we can't get to the tty.
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2017 Sam Lantinga <slouken@libsdl.org>
     4 
     5   This software is provided 'as-is', without any express or implied
     6   warranty.  In no event will the authors be held liable for any damages
     7   arising from the use of this software.
     8 
     9   Permission is granted to anyone to use this software for any purpose,
    10   including commercial applications, and to alter it and redistribute it
    11   freely, subject to the following restrictions:
    12 
    13   1. The origin of this software must not be misrepresented; you must not
    14      claim that you wrote the original software. If you use this software
    15      in a product, an acknowledgment in the product documentation would be
    16      appreciated but is not required.
    17   2. Altered source versions must be plainly marked as such, and must not be
    18      misrepresented as being the original software.
    19   3. This notice may not be removed or altered from any source distribution.
    20 */
    21 #include "../../SDL_internal.h"
    22 
    23 /* Output audio to nowhere... */
    24 
    25 #include "SDL_timer.h"
    26 #include "SDL_audio.h"
    27 #include "../SDL_audio_c.h"
    28 #include "SDL_dummyaudio.h"
    29 
    30 static int
    31 DUMMYAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
    32 {
    33     return 0;                   /* always succeeds. */
    34 }
    35 
    36 static int
    37 DUMMYAUDIO_CaptureFromDevice(_THIS, void *buffer, int buflen)
    38 {
    39     /* Delay to make this sort of simulate real audio input. */
    40     SDL_Delay((this->spec.samples * 1000) / this->spec.freq);
    41 
    42     /* always return a full buffer of silence. */
    43     SDL_memset(buffer, this->spec.silence, buflen);
    44     return buflen;
    45 }
    46 
    47 static int
    48 DUMMYAUDIO_Init(SDL_AudioDriverImpl * impl)
    49 {
    50     /* Set the function pointers */
    51     impl->OpenDevice = DUMMYAUDIO_OpenDevice;
    52     impl->CaptureFromDevice = DUMMYAUDIO_CaptureFromDevice;
    53 
    54     impl->OnlyHasDefaultOutputDevice = 1;
    55     impl->OnlyHasDefaultCaptureDevice = 1;
    56     impl->HasCaptureSupport = SDL_TRUE;
    57 
    58     return 1;   /* this audio target is available. */
    59 }
    60 
    61 AudioBootStrap DUMMYAUDIO_bootstrap = {
    62     "dummy", "SDL dummy audio driver", DUMMYAUDIO_Init, 1
    63 };
    64 
    65 /* vi: set ts=4 sw=4 expandtab: */