src/audio/dummy/SDL_dummyaudio.c
author Manuel Alfayate Corchete
Fri, 15 Jan 2021 15:00:17 +0100
changeset 14738 978a7dc6dfcc
parent 14640 b2b3343a310d
permissions -rw-r--r--
[KMS/DRM] Small fix to KMSDRM_Waitpageflip(). More comments on how it works.
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2021 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: */