| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org> |
| |
| This software is provided 'as-is', without any express or implied |
| warranty. In no event will the authors be held liable for any damages |
| arising from the use of this software. |
| |
| Permission is granted to anyone to use this software for any purpose, |
| including commercial applications, and to alter it and redistribute it |
| freely, subject to the following restrictions: |
| |
| 1. The origin of this software must not be misrepresented; you must not |
| claim that you wrote the original software. If you use this software |
| in a product, an acknowledgment in the product documentation would be |
| appreciated but is not required. |
| 2. Altered source versions must be plainly marked as such, and must not be |
| misrepresented as being the original software. |
| 3. This notice may not be removed or altered from any source distribution. |
| */ |
| #include "SDL_config.h" |
| |
| #if SDL_AUDIO_DRIVER_DISK |
| |
| /* Output raw audio data to a file. */ |
| |
| #if HAVE_STDIO_H |
| #include <stdio.h> |
| #endif |
| |
| #include "SDL_rwops.h" |
| #include "SDL_timer.h" |
| #include "SDL_audio.h" |
| #include "../SDL_audiomem.h" |
| #include "../SDL_audio_c.h" |
| #include "SDL_diskaudio.h" |
| |
| /* environment variables and defaults. */ |
| #define DISKENVR_OUTFILE "SDL_DISKAUDIOFILE" |
| #define DISKDEFAULT_OUTFILE "sdlaudio.raw" |
| #define DISKENVR_WRITEDELAY "SDL_DISKAUDIODELAY" |
| #define DISKDEFAULT_WRITEDELAY 150 |
| |
| static const char * |
| DISKAUD_GetOutputFilename(const char *devname) |
| { |
| if (devname == NULL) { |
| devname = SDL_getenv(DISKENVR_OUTFILE); |
| if (devname == NULL) { |
| devname = DISKDEFAULT_OUTFILE; |
| } |
| } |
| return devname; |
| } |
| |
| /* This function waits until it is possible to write a full sound buffer */ |
| static void |
| DISKAUD_WaitDevice(_THIS) |
| { |
| SDL_Delay(this->hidden->write_delay); |
| } |
| |
| static void |
| DISKAUD_PlayDevice(_THIS) |
| { |
| size_t written; |
| |
| /* Write the audio data */ |
| written = SDL_RWwrite(this->hidden->output, |
| this->hidden->mixbuf, 1, this->hidden->mixlen); |
| |
| /* If we couldn't write, assume fatal error for now */ |
| if (written != this->hidden->mixlen) { |
| this->enabled = 0; |
| } |
| #ifdef DEBUG_AUDIO |
| fprintf(stderr, "Wrote %d bytes of audio data\n", written); |
| #endif |
| } |
| |
| static Uint8 * |
| DISKAUD_GetDeviceBuf(_THIS) |
| { |
| return (this->hidden->mixbuf); |
| } |
| |
| static void |
| DISKAUD_CloseDevice(_THIS) |
| { |
| if (this->hidden != NULL) { |
| if (this->hidden->mixbuf != NULL) { |
| SDL_FreeAudioMem(this->hidden->mixbuf); |
| this->hidden->mixbuf = NULL; |
| } |
| if (this->hidden->output != NULL) { |
| SDL_RWclose(this->hidden->output); |
| this->hidden->output = NULL; |
| } |
| SDL_free(this->hidden); |
| this->hidden = NULL; |
| } |
| } |
| |
| static int |
| DISKAUD_OpenDevice(_THIS, const char *devname, int iscapture) |
| { |
| const char *envr = SDL_getenv(DISKENVR_WRITEDELAY); |
| const char *fname = DISKAUD_GetOutputFilename(devname); |
| |
| this->hidden = (struct SDL_PrivateAudioData *) |
| SDL_malloc(sizeof(*this->hidden)); |
| if (this->hidden == NULL) { |
| return SDL_OutOfMemory(); |
| } |
| SDL_memset(this->hidden, 0, sizeof(*this->hidden)); |
| |
| this->hidden->mixlen = this->spec.size; |
| this->hidden->write_delay = |
| (envr) ? SDL_atoi(envr) : DISKDEFAULT_WRITEDELAY; |
| |
| /* Open the audio device */ |
| this->hidden->output = SDL_RWFromFile(fname, "wb"); |
| if (this->hidden->output == NULL) { |
| DISKAUD_CloseDevice(this); |
| return -1; |
| } |
| |
| /* Allocate mixing buffer */ |
| this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen); |
| if (this->hidden->mixbuf == NULL) { |
| DISKAUD_CloseDevice(this); |
| return -1; |
| } |
| SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size); |
| |
| #if HAVE_STDIO_H |
| fprintf(stderr, |
| "WARNING: You are using the SDL disk writer audio driver!\n" |
| " Writing to file [%s].\n", fname); |
| #endif |
| |
| /* We're ready to rock and roll. :-) */ |
| return 0; |
| } |
| |
| static int |
| DISKAUD_Init(SDL_AudioDriverImpl * impl) |
| { |
| /* Set the function pointers */ |
| impl->OpenDevice = DISKAUD_OpenDevice; |
| impl->WaitDevice = DISKAUD_WaitDevice; |
| impl->PlayDevice = DISKAUD_PlayDevice; |
| impl->GetDeviceBuf = DISKAUD_GetDeviceBuf; |
| impl->CloseDevice = DISKAUD_CloseDevice; |
| |
| return 1; /* this audio target is available. */ |
| } |
| |
| AudioBootStrap DISKAUD_bootstrap = { |
| "disk", "direct-to-disk audio", DISKAUD_Init, 1 |
| }; |
| |
| #endif /* SDL_AUDIO_DRIVER_DISK */ |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |