diff options
Diffstat (limited to 'distrib/sdl-1.2.12/src/audio/dummy/SDL_dummyaudio.c')
| -rw-r--r-- | distrib/sdl-1.2.12/src/audio/dummy/SDL_dummyaudio.c | 156 |
1 files changed, 0 insertions, 156 deletions
diff --git a/distrib/sdl-1.2.12/src/audio/dummy/SDL_dummyaudio.c b/distrib/sdl-1.2.12/src/audio/dummy/SDL_dummyaudio.c deleted file mode 100644 index 6e9a3f0..0000000 --- a/distrib/sdl-1.2.12/src/audio/dummy/SDL_dummyaudio.c +++ /dev/null @@ -1,156 +0,0 @@ -/* - SDL - Simple DirectMedia Layer - Copyright (C) 1997-2006 Sam Lantinga - - This library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - This library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with this library; if not, write to the Free Software - Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA - - Sam Lantinga - slouken@libsdl.org - - This file written by Ryan C. Gordon (icculus@icculus.org) -*/ -#include "SDL_config.h" - -/* Output audio to nowhere... */ - -#include "SDL_rwops.h" -#include "SDL_timer.h" -#include "SDL_audio.h" -#include "../SDL_audiomem.h" -#include "../SDL_audio_c.h" -#include "../SDL_audiodev_c.h" -#include "SDL_dummyaudio.h" - -/* The tag name used by DUMMY audio */ -#define DUMMYAUD_DRIVER_NAME "dummy" - -/* Audio driver functions */ -static int DUMMYAUD_OpenAudio(_THIS, SDL_AudioSpec *spec); -static void DUMMYAUD_WaitAudio(_THIS); -static void DUMMYAUD_PlayAudio(_THIS); -static Uint8 *DUMMYAUD_GetAudioBuf(_THIS); -static void DUMMYAUD_CloseAudio(_THIS); - -/* Audio driver bootstrap functions */ -static int DUMMYAUD_Available(void) -{ - const char *envr = SDL_getenv("SDL_AUDIODRIVER"); - if (envr && (SDL_strcmp(envr, DUMMYAUD_DRIVER_NAME) == 0)) { - return(1); - } - return(0); -} - -static void DUMMYAUD_DeleteDevice(SDL_AudioDevice *device) -{ - SDL_free(device->hidden); - SDL_free(device); -} - -static SDL_AudioDevice *DUMMYAUD_CreateDevice(int devindex) -{ - SDL_AudioDevice *this; - - /* Initialize all variables that we clean on shutdown */ - this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); - if ( this ) { - SDL_memset(this, 0, (sizeof *this)); - this->hidden = (struct SDL_PrivateAudioData *) - SDL_malloc((sizeof *this->hidden)); - } - if ( (this == NULL) || (this->hidden == NULL) ) { - SDL_OutOfMemory(); - if ( this ) { - SDL_free(this); - } - return(0); - } - SDL_memset(this->hidden, 0, (sizeof *this->hidden)); - - /* Set the function pointers */ - this->OpenAudio = DUMMYAUD_OpenAudio; - this->WaitAudio = DUMMYAUD_WaitAudio; - this->PlayAudio = DUMMYAUD_PlayAudio; - this->GetAudioBuf = DUMMYAUD_GetAudioBuf; - this->CloseAudio = DUMMYAUD_CloseAudio; - - this->free = DUMMYAUD_DeleteDevice; - - return this; -} - -AudioBootStrap DUMMYAUD_bootstrap = { - DUMMYAUD_DRIVER_NAME, "SDL dummy audio driver", - DUMMYAUD_Available, DUMMYAUD_CreateDevice -}; - -/* This function waits until it is possible to write a full sound buffer */ -static void DUMMYAUD_WaitAudio(_THIS) -{ - /* Don't block on first calls to simulate initial fragment filling. */ - if (this->hidden->initial_calls) - this->hidden->initial_calls--; - else - SDL_Delay(this->hidden->write_delay); -} - -static void DUMMYAUD_PlayAudio(_THIS) -{ - /* no-op...this is a null driver. */ -} - -static Uint8 *DUMMYAUD_GetAudioBuf(_THIS) -{ - return(this->hidden->mixbuf); -} - -static void DUMMYAUD_CloseAudio(_THIS) -{ - if ( this->hidden->mixbuf != NULL ) { - SDL_FreeAudioMem(this->hidden->mixbuf); - this->hidden->mixbuf = NULL; - } -} - -static int DUMMYAUD_OpenAudio(_THIS, SDL_AudioSpec *spec) -{ - float bytes_per_sec = 0.0f; - - /* Allocate mixing buffer */ - this->hidden->mixlen = spec->size; - this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen); - if ( this->hidden->mixbuf == NULL ) { - return(-1); - } - SDL_memset(this->hidden->mixbuf, spec->silence, spec->size); - - bytes_per_sec = (float) (((spec->format & 0xFF) / 8) * - spec->channels * spec->freq); - - /* - * We try to make this request more audio at the correct rate for - * a given audio spec, so timing stays fairly faithful. - * Also, we have it not block at all for the first two calls, so - * it seems like we're filling two audio fragments right out of the - * gate, like other SDL drivers tend to do. - */ - this->hidden->initial_calls = 2; - this->hidden->write_delay = - (Uint32) ((((float) spec->size) / bytes_per_sec) * 1000.0f); - - /* We're ready to rock and roll. :-) */ - return(0); -} - |