src/audio/arts/SDL_artsaudio.c
author Sam Lantinga <slouken@libsdl.org>
Mon, 10 Jul 2006 21:04:37 +0000
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child 1982 3b4ce57c6215
permissions -rw-r--r--
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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_audiodev_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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/* Audio driver functions */
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static int ARTS_OpenAudio(_THIS, SDL_AudioSpec * spec);
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static void ARTS_WaitAudio(_THIS);
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static void ARTS_PlayAudio(_THIS);
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static Uint8 *ARTS_GetAudioBuf(_THIS);
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static void ARTS_CloseAudio(_THIS);
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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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static int arts_loaded = 0;
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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 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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    {
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    "arts_init", (void **) &SDL_NAME(arts_init)}, {
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    "arts_free", (void **) &SDL_NAME(arts_free)}, {
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    "arts_play_stream", (void **) &SDL_NAME(arts_play_stream)}, {
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    "arts_stream_set", (void **) &SDL_NAME(arts_stream_set)}, {
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    "arts_stream_get", (void **) &SDL_NAME(arts_stream_get)}, {
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    "arts_write", (void **) &SDL_NAME(arts_write)}, {
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"arts_close_stream", (void **) &SDL_NAME(arts_close_stream)},};
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static void
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UnloadARTSLibrary()
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{
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    if (arts_loaded) {
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        SDL_UnloadObject(arts_handle);
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        arts_handle = NULL;
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        arts_loaded = 0;
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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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    arts_handle = SDL_LoadObject(arts_library);
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    if (arts_handle) {
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        arts_loaded = 1;
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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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    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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/* Audio driver bootstrap functions */
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static int
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Audio_Available(void)
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{
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    int available = 0;
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    if (LoadARTSLibrary() < 0) {
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        return available;
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    }
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    if (SDL_NAME(arts_init) () == 0) {
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#define ARTS_CRASH_HACK         /* Play a stream so aRts doesn't crash */
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#ifdef ARTS_CRASH_HACK
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        arts_stream_t stream2;
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        stream2 = SDL_NAME(arts_play_stream) (44100, 16, 2, "SDL");
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        SDL_NAME(arts_write) (stream2, "", 0);
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        SDL_NAME(arts_close_stream) (stream2);
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#endif
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        available = 1;
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        SDL_NAME(arts_free) ();
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    }
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    UnloadARTSLibrary();
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    return available;
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}
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static void
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Audio_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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    UnloadARTSLibrary();
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}
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static SDL_AudioDevice *
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Audio_CreateDevice(int devindex)
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{
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    SDL_AudioDevice *this;
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    /* Initialize all variables that we clean on shutdown */
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    LoadARTSLibrary();
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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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    stream = 0;
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    /* Set the function pointers */
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    this->OpenAudio = ARTS_OpenAudio;
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    this->WaitAudio = ARTS_WaitAudio;
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    this->PlayAudio = ARTS_PlayAudio;
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    this->GetAudioBuf = ARTS_GetAudioBuf;
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    this->CloseAudio = ARTS_CloseAudio;
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    this->free = Audio_DeleteDevice;
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    return this;
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}
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AudioBootStrap ARTS_bootstrap = {
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    ARTS_DRIVER_NAME, "Analog Realtime Synthesizer",
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    Audio_Available, Audio_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
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ARTS_WaitAudio(_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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        if (parent && (((++cnt) % 10) == 0)) {  /* Check every 10 loops */
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            if (kill(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 = ((Sint32) (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_PlayAudio(_THIS)
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{
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    int written;
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    /* Write the audio data */
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    written = SDL_NAME(arts_write) (stream, mixbuf, mixlen);
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    /* If timer synchronization is enabled, set the next write frame */
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    if (frame_ticks) {
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        next_frame += 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 Uint8 *
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ARTS_GetAudioBuf(_THIS)
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{
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    return (mixbuf);
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}
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static void
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ARTS_CloseAudio(_THIS)
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{
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    if (mixbuf != NULL) {
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        SDL_FreeAudioMem(mixbuf);
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        mixbuf = NULL;
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    }
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    if (stream) {
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        SDL_NAME(arts_close_stream) (stream);
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        stream = 0;
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    }
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    SDL_NAME(arts_free) ();
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}
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static int
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ARTS_OpenAudio(_THIS, SDL_AudioSpec * spec)
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{
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    int bits, frag_spec;
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    Uint16 test_format, format;
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    /* Reset the timer synchronization flag */
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    frame_ticks = 0.0;
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    mixbuf = NULL;
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    /* Try for a closest match on audio format */
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    format = 0;
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    bits = 0;
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    for (test_format = SDL_FirstAudioFormat(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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            format = 1;
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            break;
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        default:
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            format = 0;
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            break;
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   304
        }
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        if (!format) {
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            test_format = SDL_NextAudioFormat();
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   307
        }
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   308
    }
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    if (format == 0) {
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        SDL_SetError("Couldn't find any hardware audio formats");
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        return (-1);
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    }
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    spec->format = test_format;
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    if (SDL_NAME(arts_init) () != 0) {
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        SDL_SetError("Unable to initialize ARTS");
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        return (-1);
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   318
    }
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    stream =
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        SDL_NAME(arts_play_stream) (spec->freq, bits, spec->channels, "SDL");
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   321
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    /* Calculate the final parameters for this audio specification */
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    SDL_CalculateAudioSpec(spec);
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   325
    /* Determine the power of two of the fragment size */
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   326
    for (frag_spec = 0; (0x01 << frag_spec) < spec->size; ++frag_spec);
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   327
    if ((0x01 << frag_spec) != spec->size) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   328
        SDL_SetError("Fragment size must be a power of two");
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   329
        return (-1);
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   330
    }
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   331
    frag_spec |= 0x00020000;    /* two fragments, for low latency */
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   332
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   333
#ifdef ARTS_P_PACKET_SETTINGS
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   334
    SDL_NAME(arts_stream_set) (stream, ARTS_P_PACKET_SETTINGS, frag_spec);
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   335
#else
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   336
    SDL_NAME(arts_stream_set) (stream, ARTS_P_PACKET_SIZE,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   337
                               frag_spec & 0xffff);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   338
    SDL_NAME(arts_stream_set) (stream, ARTS_P_PACKET_COUNT, frag_spec >> 16);
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   339
#endif
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   340
    spec->size = SDL_NAME(arts_stream_get) (stream, ARTS_P_PACKET_SIZE);
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   341
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   342
    /* Allocate mixing buffer */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   343
    mixlen = spec->size;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   344
    mixbuf = (Uint8 *) SDL_AllocAudioMem(mixlen);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   345
    if (mixbuf == NULL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   346
        return (-1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   347
    }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   348
    SDL_memset(mixbuf, spec->silence, spec->size);
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   349
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   350
    /* Get the parent process id (we're the parent of the audio thread) */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   351
    parent = getpid();
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   352
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diff changeset
   353
    /* We're ready to rock and roll. :-) */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   354
    return (0);
0
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diff changeset
   355
}
1895
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   356
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   357
/* vi: set ts=4 sw=4 expandtab: */