Implemented dummy audio driver.
Fixes Bugzilla #161. --HG-- extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401536
This commit is contained in:
Ryan C. Gordon
parent
2e50f15bed
commit
66d3d81854
15 changed files with 496 additions and 40 deletions
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@ -95,6 +95,9 @@ static AudioBootStrap *bootstrap[] = {
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#if SDL_AUDIO_DRIVER_DISK
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&DISKAUD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_DUMMY
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&DUMMYAUD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_DC
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&DCAUD_bootstrap,
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#endif
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@ -159,6 +159,9 @@ extern AudioBootStrap MINTAUDIO_DMA8_bootstrap;
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#if SDL_AUDIO_DRIVER_DISK
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extern AudioBootStrap DISKAUD_bootstrap;
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#endif
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#if SDL_AUDIO_DRIVER_DUMMY
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extern AudioBootStrap DUMMYAUD_bootstrap;
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#endif
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#if SDL_AUDIO_DRIVER_DC
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extern AudioBootStrap DCAUD_bootstrap;
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#endif
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6
src/audio/dummy/.cvsignore
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6
src/audio/dummy/.cvsignore
Normal file
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@ -0,0 +1,6 @@
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Makefile.in
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Makefile
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.libs
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*.o
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*.lo
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*.la
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154
src/audio/dummy/SDL_dummyaudio.c
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154
src/audio/dummy/SDL_dummyaudio.c
Normal file
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@ -0,0 +1,154 @@
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/*
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SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2006 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Sam Lantinga
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slouken@libsdl.org
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This file hacked^H^H^H^H^H^Hwritten by Ryan C. Gordon
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(icculus@icculus.org)
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*/
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#include "SDL_config.h"
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/* Output raw audio data to a file. */
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#if HAVE_STDIO_H
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#include <stdio.h>
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#endif
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#include "SDL_rwops.h"
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#include "SDL_timer.h"
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#include "SDL_audio.h"
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#include "../SDL_audiomem.h"
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#include "../SDL_audio_c.h"
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#include "../SDL_audiodev_c.h"
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#include "SDL_dummyaudio.h"
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/* The tag name used by DUMMY audio */
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#define DUMMYAUD_DRIVER_NAME "dummy"
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/* environment variables and defaults. */
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#define DUMMYENVR_WRITEDELAY "SDL_DUMMYAUDIODELAY"
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#define DUMMYDEFAULT_WRITEDELAY 150
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/* Audio driver functions */
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static int DUMMYAUD_OpenAudio(_THIS, SDL_AudioSpec *spec);
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static void DUMMYAUD_WaitAudio(_THIS);
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static void DUMMYAUD_PlayAudio(_THIS);
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static Uint8 *DUMMYAUD_GetAudioBuf(_THIS);
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static void DUMMYAUD_CloseAudio(_THIS);
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/* Audio driver bootstrap functions */
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static int DUMMYAUD_Available(void)
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{
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const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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if (envr && (SDL_strcmp(envr, DUMMYAUD_DRIVER_NAME) == 0)) {
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return(1);
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}
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return(0);
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}
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static void DUMMYAUD_DeleteDevice(SDL_AudioDevice *device)
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{
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SDL_free(device->hidden);
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SDL_free(device);
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}
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static SDL_AudioDevice *DUMMYAUD_CreateDevice(int devindex)
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{
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SDL_AudioDevice *this;
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const char *envr;
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/* Initialize all variables that we clean on shutdown */
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this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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if ( this ) {
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SDL_memset(this, 0, (sizeof *this));
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this->hidden = (struct SDL_PrivateAudioData *)
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SDL_malloc((sizeof *this->hidden));
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}
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if ( (this == NULL) || (this->hidden == NULL) ) {
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SDL_OutOfMemory();
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if ( this ) {
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SDL_free(this);
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}
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return(0);
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}
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SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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envr = SDL_getenv(DUMMYENVR_WRITEDELAY);
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this->hidden->write_delay = (envr) ? SDL_atoi(envr) : DUMMYDEFAULT_WRITEDELAY;
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/* Set the function pointers */
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this->OpenAudio = DUMMYAUD_OpenAudio;
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this->WaitAudio = DUMMYAUD_WaitAudio;
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this->PlayAudio = DUMMYAUD_PlayAudio;
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this->GetAudioBuf = DUMMYAUD_GetAudioBuf;
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this->CloseAudio = DUMMYAUD_CloseAudio;
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this->free = DUMMYAUD_DeleteDevice;
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return this;
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}
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AudioBootStrap DUMMYAUD_bootstrap = {
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DUMMYAUD_DRIVER_NAME, "SDL dummy audio driver",
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DUMMYAUD_Available, DUMMYAUD_CreateDevice
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};
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/* This function waits until it is possible to write a full sound buffer */
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static void DUMMYAUD_WaitAudio(_THIS)
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{
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SDL_Delay(this->hidden->write_delay);
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}
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static void DUMMYAUD_PlayAudio(_THIS)
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{
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/* no-op...this is a null driver. */
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}
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static Uint8 *DUMMYAUD_GetAudioBuf(_THIS)
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{
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return(this->hidden->mixbuf);
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}
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static void DUMMYAUD_CloseAudio(_THIS)
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{
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if ( this->hidden->mixbuf != NULL ) {
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SDL_FreeAudioMem(this->hidden->mixbuf);
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this->hidden->mixbuf = NULL;
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}
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}
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static int DUMMYAUD_OpenAudio(_THIS, SDL_AudioSpec *spec)
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{
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#if HAVE_STDIO_H
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fprintf(stderr, "\nWARNING: You are using the SDL dummy audio driver!"
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" No sound will be output!\n\n");
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#endif
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/* Allocate mixing buffer */
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this->hidden->mixlen = spec->size;
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this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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if ( this->hidden->mixbuf == NULL ) {
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return(-1);
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}
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SDL_memset(this->hidden->mixbuf, spec->silence, spec->size);
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/* We're ready to rock and roll. :-) */
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return(0);
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}
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39
src/audio/dummy/SDL_dummyaudio.h
Normal file
39
src/audio/dummy/SDL_dummyaudio.h
Normal file
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@ -0,0 +1,39 @@
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/*
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SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2006 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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#ifndef _SDL_dummyaudio_h
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#define _SDL_dummyaudio_h
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#include "../SDL_sysaudio.h"
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/* Hidden "this" pointer for the video functions */
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#define _THIS SDL_AudioDevice *this
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struct SDL_PrivateAudioData {
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/* The file descriptor for the audio device */
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Uint8 *mixbuf;
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Uint32 mixlen;
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Uint32 write_delay;
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};
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#endif /* _SDL_dummyaudio_h */
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