SDL_beaudio.cc
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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,
but WITHOUT ANY WARRANTY; without even the implied warranty of
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
License along with this library; if not, write to the Free Software
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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*/
/* Allow access to the audio stream on BeOS */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <SoundPlayer.h>
#include "SDL_BeApp.h"
extern "C" {
#include "SDL_audio.h"
#include "SDL_audio_c.h"
#include "SDL_sysaudio.h"
#include "SDL_systhread_c.h"
#include "SDL_beaudio.h"
/* Audio driver functions */
static int BE_OpenAudio(_THIS, SDL_AudioSpec *spec);
static void BE_WaitAudio(_THIS);
static void BE_PlayAudio(_THIS);
static Uint8 *BE_GetAudioBuf(_THIS);
static void BE_CloseAudio(_THIS);
/* Audio driver bootstrap functions */
static int Audio_Available(void)
{
return(1);
}
static void Audio_DeleteDevice(SDL_AudioDevice *device)
{
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SDL_free(device->hidden);
SDL_free(device);
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}
static SDL_AudioDevice *Audio_CreateDevice(int devindex)
{
SDL_AudioDevice *device;
/* Initialize all variables that we clean on shutdown */
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device = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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if ( device ) {
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SDL_memset(device, 0, (sizeof *device));
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device->hidden = (struct SDL_PrivateAudioData *)
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SDL_malloc((sizeof *device->hidden));
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}
if ( (device == NULL) || (device->hidden == NULL) ) {
SDL_OutOfMemory();
if ( device ) {
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SDL_free(device);
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}
return(0);
}
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SDL_memset(device->hidden, 0, (sizeof *device->hidden));
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/* Set the function pointers */
device->OpenAudio = BE_OpenAudio;
device->WaitAudio = BE_WaitAudio;
device->PlayAudio = BE_PlayAudio;
device->GetAudioBuf = BE_GetAudioBuf;
device->CloseAudio = BE_CloseAudio;
device->free = Audio_DeleteDevice;
return device;
}
AudioBootStrap BAUDIO_bootstrap = {
"baudio", "BeOS BSoundPlayer",
Audio_Available, Audio_CreateDevice
};
/* 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 */
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SDL_memset(stream, audio->spec.silence, len);
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/* 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);
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SDL_memcpy(stream,audio->convert.buf,audio->convert.len_cvt);
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} else {
SDL_mutexP(audio->mixer_lock);
(*audio->spec.callback)(audio->spec.userdata,
(Uint8 *)stream, len);
SDL_mutexV(audio->mixer_lock);
}
}
return;
}
/* Dummy functions -- we don't use thread-based audio */
void BE_WaitAudio(_THIS)
{
return;
}
void BE_PlayAudio(_THIS)
{
return;
}
Uint8 *BE_GetAudioBuf(_THIS)
{
return(NULL);
}
void BE_CloseAudio(_THIS)
{
if ( audio_obj ) {
audio_obj->Stop();
delete audio_obj;
audio_obj = NULL;
}
/* Quit the Be Application, if there's nothing left to do */
SDL_QuitBeApp();
}
int BE_OpenAudio(_THIS, SDL_AudioSpec *spec)
{
media_raw_audio_format format;
/* Initialize the Be Application, if it's not already started */
if ( SDL_InitBeApp() < 0 ) {
return(-1);
}
/* Parse the audio format and fill the Be raw audio format */
format.frame_rate = (float)spec->freq;
format.channel_count = spec->channels;
switch (spec->format&~0x1000) {
case AUDIO_S8:
/* Signed 8-bit audio unsupported, convert to U8 */
spec->format = AUDIO_U8;
case AUDIO_U8:
format.format = media_raw_audio_format::B_AUDIO_UCHAR;
format.byte_order = 0;
break;
case AUDIO_U16:
/* Unsigned 16-bit audio unsupported, convert to S16 */
spec->format ^= 0x8000;
case AUDIO_S16:
format.format = media_raw_audio_format::B_AUDIO_SHORT;
if ( spec->format & 0x1000 ) {
format.byte_order = 1; /* Big endian */
} else {
format.byte_order = 2; /* Little endian */
}
break;
}
format.buffer_size = spec->samples;
/* Calculate the final parameters for this audio specification */
SDL_CalculateAudioSpec(spec);
/* Subscribe to the audio stream (creates a new thread) */
{ sigset_t omask;
SDL_MaskSignals(&omask);
audio_obj = new BSoundPlayer(&format, "SDL Audio", FillSound,
NULL, _this);
SDL_UnmaskSignals(&omask);
}
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if ( audio_obj->Start() == B_NO_ERROR ) {
audio_obj->SetHasData(true);
} else {
SDL_SetError("Unable to start Be audio");
return(-1);
}
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/* We're running! */
return(1);
}
}; /* Extern C */