src/audio/arts/SDL_artsaudio.c
author Ryan C. Gordon <icculus@icculus.org>
Tue, 26 Jul 2011 14:18:00 -0700
changeset 5594 e741303e08a8
parent 5535 96594ac5fd1a
child 6044 35448a5ea044
permissions -rw-r--r--
Removed needless macros in various audio targets.
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_config.h"
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/* Allow access to a raw mixing buffer */
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#ifdef HAVE_SIGNAL_H
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#include <signal.h>
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#endif
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#include <unistd.h>
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#include <errno.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_artsaudio.h"
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#ifdef SDL_AUDIO_DRIVER_ARTS_DYNAMIC
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#include "SDL_name.h"
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#include "SDL_loadso.h"
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#else
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#define SDL_NAME(X)	X
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#endif
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#ifdef SDL_AUDIO_DRIVER_ARTS_DYNAMIC
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static const char *arts_library = SDL_AUDIO_DRIVER_ARTS_DYNAMIC;
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static void *arts_handle = NULL;
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/* !!! FIXME: I hate this SDL_NAME clutter...it makes everything so messy! */
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static int (*SDL_NAME(arts_init)) (void);
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static void (*SDL_NAME(arts_free)) (void);
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static arts_stream_t(*SDL_NAME(arts_play_stream)) (int rate, int bits,
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                                                   int channels,
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                                                   const char *name);
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static int (*SDL_NAME(arts_stream_set)) (arts_stream_t s,
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                                         arts_parameter_t param, int value);
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static int (*SDL_NAME(arts_stream_get)) (arts_stream_t s,
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                                         arts_parameter_t param);
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static int (*SDL_NAME(arts_write)) (arts_stream_t s, const void *buffer,
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                                    int count);
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static void (*SDL_NAME(arts_close_stream)) (arts_stream_t s);
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static int (*SDL_NAME(arts_suspended)) (void);
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static const char *(*SDL_NAME(arts_error_text)) (int errorcode);
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#define SDL_ARTS_SYM(x) { #x, (void **) (char *) &SDL_NAME(x) }
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static struct
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{
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    const char *name;
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    void **func;
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} arts_functions[] = {
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/* *INDENT-OFF* */
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    SDL_ARTS_SYM(arts_init),
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    SDL_ARTS_SYM(arts_free),
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    SDL_ARTS_SYM(arts_play_stream),
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    SDL_ARTS_SYM(arts_stream_set),
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    SDL_ARTS_SYM(arts_stream_get),
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    SDL_ARTS_SYM(arts_write),
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    SDL_ARTS_SYM(arts_close_stream),
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    SDL_ARTS_SYM(arts_suspended),
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    SDL_ARTS_SYM(arts_error_text),
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/* *INDENT-ON* */
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};
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#undef SDL_ARTS_SYM
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static void
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UnloadARTSLibrary()
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{
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    if (arts_handle != NULL) {
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        SDL_UnloadObject(arts_handle);
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        arts_handle = NULL;
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    }
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}
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static int
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LoadARTSLibrary(void)
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{
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    int i, retval = -1;
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    if (arts_handle == NULL) {
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        arts_handle = SDL_LoadObject(arts_library);
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        if (arts_handle != NULL) {
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            retval = 0;
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            for (i = 0; i < SDL_arraysize(arts_functions); ++i) {
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                *arts_functions[i].func =
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                    SDL_LoadFunction(arts_handle, arts_functions[i].name);
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                if (!*arts_functions[i].func) {
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                    retval = -1;
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                    UnloadARTSLibrary();
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                    break;
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                }
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            }
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        }
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    }
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    return retval;
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}
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#else
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static void
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UnloadARTSLibrary()
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{
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    return;
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}
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static int
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LoadARTSLibrary(void)
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{
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    return 0;
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}
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#endif /* SDL_AUDIO_DRIVER_ARTS_DYNAMIC */
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/* This function waits until it is possible to write a full sound buffer */
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static void
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ARTS_WaitDevice(_THIS)
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{
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    Sint32 ticks;
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    /* Check to see if the thread-parent process is still alive */
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    {
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        static int cnt = 0;
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        /* Note that this only works with thread implementations
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           that use a different process id for each thread.
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         */
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        /* Check every 10 loops */
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        if (this->hidden->parent && (((++cnt) % 10) == 0)) {
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            if (kill(this->hidden->parent, 0) < 0 && errno == ESRCH) {
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                this->enabled = 0;
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            }
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        }
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    }
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    /* Use timer for general audio synchronization */
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    ticks =
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        ((Sint32) (this->hidden->next_frame - SDL_GetTicks())) - FUDGE_TICKS;
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    if (ticks > 0) {
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        SDL_Delay(ticks);
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    }
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}
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static void
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ARTS_PlayDevice(_THIS)
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{
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    /* Write the audio data */
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    int written = SDL_NAME(arts_write) (this->hidden->stream,
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                                        this->hidden->mixbuf,
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                                        this->hidden->mixlen);
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    /* If timer synchronization is enabled, set the next write frame */
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    if (this->hidden->frame_ticks) {
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        this->hidden->next_frame += this->hidden->frame_ticks;
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    }
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    /* If we couldn't write, assume fatal error for now */
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    if (written < 0) {
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        this->enabled = 0;
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    }
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#ifdef DEBUG_AUDIO
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    fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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#endif
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}
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static void
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ARTS_WaitDone(_THIS)
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{
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    /* !!! FIXME: camp here until buffer drains... SDL_Delay(???); */
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}
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static Uint8 *
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ARTS_GetDeviceBuf(_THIS)
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{
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    return (this->hidden->mixbuf);
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}
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static void
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ARTS_CloseDevice(_THIS)
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{
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    if (this->hidden != NULL) {
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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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        if (this->hidden->stream) {
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            SDL_NAME(arts_close_stream) (this->hidden->stream);
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            this->hidden->stream = 0;
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        }
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        SDL_NAME(arts_free) ();
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        SDL_free(this->hidden);
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        this->hidden = NULL;
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    }
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}
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static int
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ARTS_OpenDevice(_THIS, const char *devname, int iscapture)
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{
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    int rc = 0;
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    int bits = 0, frag_spec = 0;
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    SDL_AudioFormat test_format = 0, format = 0;
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    /* Initialize all variables that we clean on shutdown */
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    this->hidden = (struct SDL_PrivateAudioData *)
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        SDL_malloc((sizeof *this->hidden));
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    if (this->hidden == NULL) {
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        SDL_OutOfMemory();
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        return 0;
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   231
    }
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    SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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    /* Try for a closest match on audio format */
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    for (test_format = SDL_FirstAudioFormat(this->spec.format);
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         !format && test_format;) {
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#ifdef DEBUG_AUDIO
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        fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
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#endif
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        switch (test_format) {
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        case AUDIO_U8:
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            bits = 8;
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            format = 1;
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            break;
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        case AUDIO_S16LSB:
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            bits = 16;
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   247
            format = 1;
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            break;
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   249
        default:
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            format = 0;
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   251
            break;
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   252
        }
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   253
        if (!format) {
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            test_format = SDL_NextAudioFormat();
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   255
        }
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   256
    }
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   257
    if (format == 0) {
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   258
        ARTS_CloseDevice(this);
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        SDL_SetError("Couldn't find any hardware audio formats");
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        return 0;
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   261
    }
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   262
    this->spec.format = test_format;
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   263
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   264
    if ((rc = SDL_NAME(arts_init) ()) != 0) {
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   265
        ARTS_CloseDevice(this);
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   266
        SDL_SetError("Unable to initialize ARTS: %s",
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   267
                     SDL_NAME(arts_error_text) (rc));
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   268
        return 0;
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   269
    }
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   271
    if (!SDL_NAME(arts_suspended) ()) {
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   272
        ARTS_CloseDevice(this);
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   273
        SDL_SetError("ARTS can not open audio device");
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   274
        return 0;
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   275
    }
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   276
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    this->hidden->stream = SDL_NAME(arts_play_stream) (this->spec.freq,
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   278
                                                       bits,
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   279
                                                       this->spec.channels,
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   280
                                                       "SDL");
0
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   281
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   282
    /* Play nothing so we have at least one write (server bug workaround). */
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   283
    SDL_NAME(arts_write) (this->hidden->stream, "", 0);
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   284
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   285
    /* Calculate the final parameters for this audio specification */
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   286
    SDL_CalculateAudioSpec(&this->spec);
0
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   287
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   288
    /* Determine the power of two of the fragment size */
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diff changeset
   289
    for (frag_spec = 0; (0x01 << frag_spec) < this->spec.size; ++frag_spec);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   290
    if ((0x01 << frag_spec) != this->spec.size) {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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   291
        ARTS_CloseDevice(this);
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   292
        SDL_SetError("Fragment size must be a power of two");
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   293
        return 0;
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diff changeset
   294
    }
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   295
    frag_spec |= 0x00020000;    /* two fragments, for low latency */
0
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   296
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   297
#ifdef ARTS_P_PACKET_SETTINGS
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   298
    SDL_NAME(arts_stream_set) (this->hidden->stream,
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   299
                               ARTS_P_PACKET_SETTINGS, frag_spec);
0
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   300
#else
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   301
    SDL_NAME(arts_stream_set) (this->hidden->stream, ARTS_P_PACKET_SIZE,
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   302
                               frag_spec & 0xffff);
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diff changeset
   303
    SDL_NAME(arts_stream_set) (this->hidden->stream, ARTS_P_PACKET_COUNT,
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   304
                               frag_spec >> 16);
0
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diff changeset
   305
#endif
2049
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diff changeset
   306
    this->spec.size = SDL_NAME(arts_stream_get) (this->hidden->stream,
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diff changeset
   307
                                                 ARTS_P_PACKET_SIZE);
0
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diff changeset
   308
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diff changeset
   309
    /* Allocate mixing buffer */
2049
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diff changeset
   310
    this->hidden->mixlen = this->spec.size;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   311
    this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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diff changeset
   312
    if (this->hidden->mixbuf == NULL) {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   313
        ARTS_CloseDevice(this);
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diff changeset
   314
        SDL_OutOfMemory();
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diff changeset
   315
        return 0;
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diff changeset
   316
    }
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diff changeset
   317
    SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
0
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diff changeset
   318
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   319
    /* Get the parent process id (we're the parent of the audio thread) */
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diff changeset
   320
    this->hidden->parent = getpid();
0
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diff changeset
   321
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   322
    /* We're ready to rock and roll. :-) */
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   323
    return 1;
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diff changeset
   324
}
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   325
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   326
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   327
static void
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   328
ARTS_Deinitialize(void)
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   329
{
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   330
    UnloadARTSLibrary();
0
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diff changeset
   331
}
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   332
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diff changeset
   333
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   334
static int
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diff changeset
   335
ARTS_Init(SDL_AudioDriverImpl * impl)
2049
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diff changeset
   336
{
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   337
    if (LoadARTSLibrary() < 0) {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   338
        return 0;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   339
    } else {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   340
        if (SDL_NAME(arts_init) () != 0) {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   341
            UnloadARTSLibrary();
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   342
            SDL_SetError("ARTS: arts_init failed (no audio server?)");
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   343
            return 0;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   344
        }
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   345
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   346
        /* Play a stream so aRts doesn't crash */
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   347
        if (SDL_NAME(arts_suspended) ()) {
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diff changeset
   348
            arts_stream_t stream;
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diff changeset
   349
            stream = SDL_NAME(arts_play_stream) (44100, 16, 2, "SDL");
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diff changeset
   350
            SDL_NAME(arts_write) (stream, "", 0);
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diff changeset
   351
            SDL_NAME(arts_close_stream) (stream);
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diff changeset
   352
        }
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diff changeset
   353
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diff changeset
   354
        SDL_NAME(arts_free) ();
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diff changeset
   355
    }
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   356
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   357
    /* Set the function pointers */
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   358
    impl->OpenDevice = ARTS_OpenDevice;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   359
    impl->PlayDevice = ARTS_PlayDevice;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   360
    impl->WaitDevice = ARTS_WaitDevice;
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diff changeset
   361
    impl->GetDeviceBuf = ARTS_GetDeviceBuf;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   362
    impl->CloseDevice = ARTS_CloseDevice;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   363
    impl->WaitDone = ARTS_WaitDone;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
   364
    impl->Deinitialize = ARTS_Deinitialize;
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Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
   365
    impl->OnlyHasDefaultOutputDevice = 1;
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parents: 1982
diff changeset
   366
3699
4160ba33b597 Removed test for "driver is valid, but doesn't see any audio devices."
Ryan C. Gordon <icculus@icculus.org>
parents: 3697
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   367
    return 1;   /* this audio target is available. */
2049
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parents: 1982
diff changeset
   368
}
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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parents: 1982
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   369
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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parents: 1982
diff changeset
   370
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Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
   371
AudioBootStrap ARTS_bootstrap = {
5594
e741303e08a8 Removed needless macros in various audio targets.
Ryan C. Gordon <icculus@icculus.org>
parents: 5535
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   372
    "arts", "Analog RealTime Synthesizer", ARTS_Init, 0
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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parents: 1982
diff changeset
   373
};
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Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
   374
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   375
/* vi: set ts=4 sw=4 expandtab: */