src/audio/baudio/SDL_beaudio.cc

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2006 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

/* Allow access to the audio stream on BeOS */

#include <SoundPlayer.h>

#include "../../main/beos/SDL_BeApp.h"

extern "C"
{

#include "SDL_audio.h"
#include "../SDL_audio_c.h"
#include "../SDL_sysaudio.h"
#include "../../thread/beos/SDL_systhread_c.h"
#include "SDL_beaudio.h"

}


/* !!! FIXME: have the callback call the higher level to avoid code dupe. */
/* The BeOS callback for handling the audio buffer */
static void
FillSound(void *device, void *stream, size_t len,
          const media_raw_audio_format & format)
{
    SDL_AudioDevice *audio = (SDL_AudioDevice *) device;

    /* Silence the buffer, since it's ours */
    SDL_memset(stream, audio->spec.silence, len);

    /* Only do soemthing if audio is enabled */
    if (!audio->enabled)
        return;

    if (!audio->paused) {
        if (audio->convert.needed) {
            SDL_mutexP(audio->mixer_lock);
            (*audio->spec.callback) (audio->spec.userdata,
                                         (Uint8 *) audio->convert.buf,
                                         audio->convert.len);
            SDL_mutexV(audio->mixer_lock);
            SDL_ConvertAudio(&audio->convert);
            SDL_memcpy(stream, audio->convert.buf, audio->convert.len_cvt);
        } else {
            SDL_mutexP(audio->mixer_lock);
            (*audio->spec.callback) (audio->spec.userdata,
                                        (Uint8 *) stream, len);
            SDL_mutexV(audio->mixer_lock);
        }
    }
}

static void
BEOSAUDIO_CloseDevice(_THIS)
{
    if (_this->hidden != NULL) {
        if (_this->hidden->audio_obj) {
            _this->hidden->audio_obj->Stop();
            delete _this->hidden->audio_obj;
            _this->hidden->audio_obj = NULL;
        }

        delete _this->hidden;
        _this->hidden = NULL;
    }
}

static int
BEOSAUDIO_OpenDevice(_THIS, const char *devname, int iscapture)
{
    int valid_datatype = 0;
    media_raw_audio_format format;
    SDL_AudioFormat test_format = SDL_FirstAudioFormat(_this->spec.format);

    /* Initialize all variables that we clean on shutdown */
    _this->hidden = new SDL_PrivateAudioData;
    if (_this->hidden == NULL) {
        SDL_OutOfMemory();
        return 0;
    }
    SDL_memset(_this->hidden, 0, (sizeof *_this->hidden));

    /* Parse the audio format and fill the Be raw audio format */
    SDL_memset(&format, '\0', sizeof(media_raw_audio_format));
    format.byte_order = B_MEDIA_LITTLE_ENDIAN;
    format.frame_rate = (float) _this->spec.freq;
    format.channel_count = _this->spec.channels;  /* !!! FIXME: support > 2? */
    while ((!valid_datatype) && (test_format)) {
        valid_datatype = 1;
        _this->spec.format = test_format;
        switch (test_format) {
            case AUDIO_S8:
                format.format = media_raw_audio_format::B_AUDIO_CHAR;
                break;

            case AUDIO_U8:
                format.format = media_raw_audio_format::B_AUDIO_UCHAR;
                break;

            case AUDIO_S16LSB:
                format.format = media_raw_audio_format::B_AUDIO_SHORT;
                break;

            case AUDIO_S16MSB:
                format.format = media_raw_audio_format::B_AUDIO_SHORT;
                format.byte_order = B_MEDIA_BIG_ENDIAN;
                break;

            case AUDIO_S32LSB:
                format.format = media_raw_audio_format::B_AUDIO_INT;
                break;

            case AUDIO_S32MSB:
                format.format = media_raw_audio_format::B_AUDIO_INT;
                format.byte_order = B_MEDIA_BIG_ENDIAN;
                break;

            case AUDIO_F32LSB:
                format.format = media_raw_audio_format::B_AUDIO_FLOAT;
                break;

            case AUDIO_F32MSB:
                format.format = media_raw_audio_format::B_AUDIO_FLOAT;
                format.byte_order = B_MEDIA_BIG_ENDIAN;
                break;

            default:
                valid_datatype = 0;
                test_format = SDL_NextAudioFormat();
                break;
        }
    }

    format.buffer_size = _this->spec.samples;

    if (!valid_datatype) {  /* shouldn't happen, but just in case... */
        BEOSAUDIO_CloseDevice(_this);
        SDL_SetError("Unsupported audio format");
        return 0;
    }

    /* Calculate the final parameters for this audio specification */
    SDL_CalculateAudioSpec(&_this->spec);

    /* Subscribe to the audio stream (creates a new thread) */
    sigset_t omask;
    SDL_MaskSignals(&omask);
    _this->hidden->audio_obj = new BSoundPlayer(&format, "SDL Audio",
                                                FillSound, NULL, _this);
    SDL_UnmaskSignals(&omask);

    if (_this->hidden->audio_obj->Start() == B_NO_ERROR) {
        _this->hidden->audio_obj->SetHasData(true);
    } else {
        BEOSAUDIO_CloseDevice(_this);
        SDL_SetError("Unable to start Be audio");
        return 0;
    }

    /* We're running! */
    return 1;
}

static void
BEOSAUDIO_Deinitialize(void)
{
    SDL_QuitBeApp();
}

static int
BEOSAUDIO_Init(SDL_AudioDriverImpl *impl)
{
    /* Initialize the Be Application, if it's not already started */
    if (SDL_InitBeApp() < 0) {
        return 0;
    }

    /* Set the function pointers */
    impl->OpenDevice = BEOSAUDIO_OpenDevice;
    impl->CloseDevice = BEOSAUDIO_CloseDevice;
    impl->Deinitialize = BEOSAUDIO_Deinitialize;
    impl->ProvidesOwnCallbackThread = 1;
    impl->OnlyHasDefaultOutputDevice = 1;

    return 1;
}

extern "C" { extern AudioBootStrap BEOSAUDIO_bootstrap; }
AudioBootStrap BEOSAUDIO_bootstrap = {
    "baudio", "BeOS BSoundPlayer", BEOSAUDIO_Init, 0
};

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