SDL  2.0
SDL_dummyaudio.c
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 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
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
49 {
50  /* Set the function pointers */
53 
57 
58  return 1; /* this audio target is available. */
59 }
60 
62  "dummy", "SDL dummy audio driver", DUMMYAUDIO_Init, 1
63 };
64 
65 /* vi: set ts=4 sw=4 expandtab: */
Uint8 silence
Definition: SDL_audio.h:182
static int DUMMYAUDIO_CaptureFromDevice(_THIS, void *buffer, int buflen)
Uint16 samples
Definition: SDL_audio.h:183
SDL_AudioSpec spec
Definition: loopwave.c:31
static int DUMMYAUDIO_Init(SDL_AudioDriverImpl *impl)
EGLImageKHR EGLint EGLint * handle
Definition: eglext.h:937
#define _THIS
AudioBootStrap DUMMYAUDIO_bootstrap
#define SDL_Delay
int(* OpenDevice)(_THIS, void *handle, const char *devname, int iscapture)
Definition: SDL_sysaudio.h:68
GLuint buffer
int(* CaptureFromDevice)(_THIS, void *buffer, int buflen)
Definition: SDL_sysaudio.h:76
static int DUMMYAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
#define SDL_memset