src/audio/arts/SDL_artsaudio.c
author Ryan C. Gordon <icculus@icculus.org>
Thu, 14 Jun 2007 14:22:54 +0000
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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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/* Allow access to a raw mixing buffer */
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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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/* The tag name used by artsc audio */
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#define ARTS_DRIVER_NAME         "arts"
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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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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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};
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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) {
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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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   190
    return (this->hidden->mixbuf);
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   191
}
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static void
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ARTS_CloseDevice(_THIS)
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{
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   197
    if (this->hidden != NULL) {
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   198
        if (this->hidden->mixbuf != NULL) {
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   199
            SDL_FreeAudioMem(this->hidden->mixbuf);
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            this->hidden->mixbuf = NULL;
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   201
        }
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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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   205
        }
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   206
        SDL_NAME(arts_free) ();
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   207
        SDL_free(this->hidden);
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        this->hidden = NULL;
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    }
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}
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   211
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   212
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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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   216
    int rc = 0;
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   217
    int bits = 0, frag_spec = 0;
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   218
    SDL_AudioFormat test_format = 0, format = 0;
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   219
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   220
    /* Initialize all variables that we clean on shutdown */
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   221
    this->hidden = (struct SDL_PrivateAudioData *)
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   222
        SDL_malloc((sizeof *this->hidden));
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   223
    if (this->hidden == NULL) {
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   224
        SDL_OutOfMemory();
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   225
        return 0;
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   226
    }
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   227
    SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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   229
    /* Try for a closest match on audio format */
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   230
    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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   238
            format = 1;
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   239
            break;
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   240
        case AUDIO_S16LSB:
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   241
            bits = 16;
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   242
            format = 1;
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   243
            break;
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   244
        default:
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   245
            format = 0;
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   246
            break;
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   247
        }
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        if (!format) {
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            test_format = SDL_NextAudioFormat();
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        }
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    }
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    if (format == 0) {
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        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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    }
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    this->spec.format = test_format;
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   259
    if ((rc = SDL_NAME(arts_init) ()) != 0) {
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        ARTS_CloseDevice(this);
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        SDL_SetError("Unable to initialize ARTS: %s",
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                     SDL_NAME(arts_error_text) (rc));
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   263
        return 0;
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    }
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    if ( ! SDL_NAME(arts_suspended)() ) {
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        ARTS_CloseDevice(this);
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        SDL_SetError("ARTS can not open audio device");
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        return 0;
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    }
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    this->hidden->stream = SDL_NAME(arts_play_stream) (this->spec.freq,
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                                                       bits,
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                                                       this->spec.channels,
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                                                       "SDL");
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    /* Play nothing so we have at least one write (server bug workaround). */
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    SDL_NAME(arts_write) (this->hidden->stream, "", 0);
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    /* Calculate the final parameters for this audio specification */
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    SDL_CalculateAudioSpec(&this->spec);
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    /* Determine the power of two of the fragment size */
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    for (frag_spec = 0; (0x01 << frag_spec) < this->spec.size; ++frag_spec);
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   285
    if ((0x01 << frag_spec) != this->spec.size) {
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        ARTS_CloseDevice(this);
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        SDL_SetError("Fragment size must be a power of two");
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   288
        return 0;
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    }
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    frag_spec |= 0x00020000;    /* two fragments, for low latency */
0
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#ifdef ARTS_P_PACKET_SETTINGS
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    SDL_NAME(arts_stream_set) (this->hidden->stream,
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                               ARTS_P_PACKET_SETTINGS, frag_spec);
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   295
#else
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   296
    SDL_NAME(arts_stream_set) (this->hidden->stream, ARTS_P_PACKET_SIZE,
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   297
                               frag_spec & 0xffff);
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   298
    SDL_NAME(arts_stream_set) (this->hidden->stream, ARTS_P_PACKET_COUNT,
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   299
                               frag_spec >> 16);
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#endif
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   301
    this->spec.size = SDL_NAME(arts_stream_get) (this->hidden->stream,
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                                                 ARTS_P_PACKET_SIZE);
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    /* Allocate mixing buffer */
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   305
    this->hidden->mixlen = this->spec.size;
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   306
    this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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   307
    if (this->hidden->mixbuf == NULL) {
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   308
        ARTS_CloseDevice(this);
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   309
        SDL_OutOfMemory();
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   310
        return 0;
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   311
    }
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   312
    SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
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    /* Get the parent process id (we're the parent of the audio thread) */
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   315
    this->hidden->parent = getpid();
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    /* We're ready to rock and roll. :-) */
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   318
    return 1;
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   319
}
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static void
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   323
ARTS_Deinitialize(void)
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   324
{
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   325
    UnloadARTSLibrary();
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   326
}
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   327
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   328
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   329
static int
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   330
ARTS_Init(SDL_AudioDriverImpl * impl)
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   331
{
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diff changeset
   332
    if (LoadARTSLibrary() < 0) {
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   333
        return 0;
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diff changeset
   334
    } else {
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diff changeset
   335
        if (SDL_NAME(arts_init) () != 0) {
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   336
            UnloadARTSLibrary();
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diff changeset
   337
            SDL_SetError("ARTS: arts_init failed (no audio server?)");
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   338
            return 0;
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diff changeset
   339
        }
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   340
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diff changeset
   341
        /* Play a stream so aRts doesn't crash */
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diff changeset
   342
        if ( SDL_NAME(arts_suspended)() ) {
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   343
            arts_stream_t stream;
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   344
            stream = SDL_NAME(arts_play_stream) (44100, 16, 2, "SDL");
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diff changeset
   345
            SDL_NAME(arts_write) (stream, "", 0);
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diff changeset
   346
            SDL_NAME(arts_close_stream) (stream);
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diff changeset
   347
        }
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   348
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diff changeset
   349
        SDL_NAME(arts_free) ();
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   350
    }
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   351
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   352
    /* Set the function pointers */
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diff changeset
   353
    impl->OpenDevice = ARTS_OpenDevice;
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   354
    impl->PlayDevice = ARTS_PlayDevice;
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   355
    impl->WaitDevice = ARTS_WaitDevice;
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diff changeset
   356
    impl->GetDeviceBuf = ARTS_GetDeviceBuf;
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   357
    impl->CloseDevice = ARTS_CloseDevice;
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diff changeset
   358
    impl->WaitDone = ARTS_WaitDone;
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diff changeset
   359
    impl->Deinitialize = ARTS_Deinitialize;
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diff changeset
   360
    impl->OnlyHasDefaultOutputDevice = 1;
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diff changeset
   361
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diff changeset
   362
    return 1;
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diff changeset
   363
}
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
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5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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parents: 1982
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   365
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
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   366
AudioBootStrap ARTS_bootstrap = {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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parents: 1982
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    ARTS_DRIVER_NAME, "Analog RealTime Synthesizer", ARTS_Init, 0
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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parents: 1982
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};
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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parents: 1982
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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
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/* vi: set ts=4 sw=4 expandtab: */