src/audio/baudio/SDL_beaudio.cc
author Sam Lantinga <slouken@libsdl.org>
Tue, 09 May 2006 08:52:54 +0000
changeset 1794 5605a9820134
parent 1403 376665398b25
child 1662 782fd950bd46
child 1895 c121d94672cb
child 3851 405a192b68e7
permissions -rw-r--r--
Fixed bug #137 If SDL_OpenAudio() is passed zero for the desired format fields, the following environment variables will be used to fill them in: SDL_AUDIO_FREQUENCY SDL_AUDIO_FORMAT SDL_AUDIO_CHANNELS SDL_AUDIO_SAMPLES If an environment variable is not specified, it will be set to a reasonable default value.
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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 the audio stream on BeOS */
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#include <SoundPlayer.h>
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#include "../../main/beos/SDL_BeApp.h"
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extern "C" {
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#include "SDL_audio.h"
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#include "../SDL_audio_c.h"
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#include "../SDL_sysaudio.h"
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#include "../../thread/beos/SDL_systhread_c.h"
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#include "SDL_beaudio.h"
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/* Audio driver functions */
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static int BE_OpenAudio(_THIS, SDL_AudioSpec *spec);
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static void BE_WaitAudio(_THIS);
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static void BE_PlayAudio(_THIS);
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static Uint8 *BE_GetAudioBuf(_THIS);
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static void BE_CloseAudio(_THIS);
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/* Audio driver bootstrap functions */
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static int Audio_Available(void)
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{
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	return(1);
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}
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static void 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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}
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static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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{
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	SDL_AudioDevice *device;
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	/* 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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	}
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	if ( (device == NULL) || (device->hidden == NULL) ) {
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		SDL_OutOfMemory();
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		if ( device ) {
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			SDL_free(device);
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		}
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		return(0);
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	}
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	SDL_memset(device->hidden, 0, (sizeof *device->hidden));
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	/* Set the function pointers */
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	device->OpenAudio = BE_OpenAudio;
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	device->WaitAudio = BE_WaitAudio;
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	device->PlayAudio = BE_PlayAudio;
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	device->GetAudioBuf = BE_GetAudioBuf;
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	device->CloseAudio = BE_CloseAudio;
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	device->free = Audio_DeleteDevice;
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	return device;
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}
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AudioBootStrap BAUDIO_bootstrap = {
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	"baudio", "BeOS BSoundPlayer",
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	Audio_Available, Audio_CreateDevice
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};
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/* The BeOS callback for handling the audio buffer */
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static void FillSound(void *device, void *stream, size_t len, 
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					const media_raw_audio_format &format)
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{
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	SDL_AudioDevice *audio = (SDL_AudioDevice *)device;
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	/* 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 */
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	if ( ! audio->enabled )
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		return;
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	if ( ! audio->paused ) {
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		if ( audio->convert.needed ) {
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			SDL_mutexP(audio->mixer_lock);
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			(*audio->spec.callback)(audio->spec.userdata,
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				(Uint8 *)audio->convert.buf,audio->convert.len);
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			SDL_mutexV(audio->mixer_lock);
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			SDL_ConvertAudio(&audio->convert);
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			SDL_memcpy(stream,audio->convert.buf,audio->convert.len_cvt);
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		} else {
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			SDL_mutexP(audio->mixer_lock);
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			(*audio->spec.callback)(audio->spec.userdata,
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						(Uint8 *)stream, len);
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			SDL_mutexV(audio->mixer_lock);
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		}
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	}
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	return;
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}
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/* Dummy functions -- we don't use thread-based audio */
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void BE_WaitAudio(_THIS)
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{
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	return;
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}
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void BE_PlayAudio(_THIS)
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{
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	return;
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}
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Uint8 *BE_GetAudioBuf(_THIS)
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{
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	return(NULL);
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}
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void BE_CloseAudio(_THIS)
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{
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	if ( audio_obj ) {
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		audio_obj->Stop();
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		delete audio_obj;
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		audio_obj = NULL;
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	}
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	/* Quit the Be Application, if there's nothing left to do */
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	SDL_QuitBeApp();
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}
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int BE_OpenAudio(_THIS, SDL_AudioSpec *spec)
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{
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	media_raw_audio_format format;
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	/* Initialize the Be Application, if it's not already started */
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	if ( SDL_InitBeApp() < 0 ) {
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		return(-1);
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	}
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	/* Parse the audio format and fill the Be raw audio format */
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	format.frame_rate = (float)spec->freq;
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	format.channel_count = spec->channels;
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	switch (spec->format&~0x1000) {
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		case AUDIO_S8:
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			/* Signed 8-bit audio unsupported, convert to U8 */
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			spec->format = AUDIO_U8;
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		case AUDIO_U8:
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			format.format = media_raw_audio_format::B_AUDIO_UCHAR;
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			format.byte_order = 0;
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			break;
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		case AUDIO_U16:
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			/* Unsigned 16-bit audio unsupported, convert to S16 */
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			spec->format ^= 0x8000;
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		case AUDIO_S16:
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			format.format = media_raw_audio_format::B_AUDIO_SHORT;
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			if ( spec->format & 0x1000 ) {
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				format.byte_order = 1; /* Big endian */
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			} else {
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				format.byte_order = 2; /* Little endian */
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			}
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			break;
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	}
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	format.buffer_size = spec->samples;
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	/* Calculate the final parameters for this audio specification */
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	SDL_CalculateAudioSpec(spec);
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	/* Subscribe to the audio stream (creates a new thread) */
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	{ sigset_t omask;
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		SDL_MaskSignals(&omask);
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		audio_obj = new BSoundPlayer(&format, "SDL Audio", FillSound,
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		                                                 NULL, _this);
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		SDL_UnmaskSignals(&omask);
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	}
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	if ( audio_obj->Start() == B_NO_ERROR ) {
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		audio_obj->SetHasData(true);
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	} else {
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		SDL_SetError("Unable to start Be audio");
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		return(-1);
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	}
0
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	/* We're running! */
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	return(1);
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}
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};	/* Extern C */