view src/audio/android/SDL_androidaudio.c @ 5006:8e8876e4aec6

Include windows.h in SDL_atomic.h by default, but don't include the atomic API in SDL.h This allows all SDL code to take advantage of the atomic intrinsics on Windows, but doesn't cause applications just including SDL.h to pull in windows.h
author Sam Lantinga <slouken@libsdl.org>
date Sun, 16 Jan 2011 17:45:42 -0800 (2011-01-17)
parents 8d7315668e35
children 327f181542f1
line wrap: on
line source
/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2010 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"

/* Output audio to Android */

#include "SDL_audio.h"
#include "../SDL_audio_c.h"
#include "SDL_androidaudio.h"

#include "../../SDL_android.h"

#include <android/log.h>

static void * audioDevice;

static int
AndroidAUD_OpenDevice(_THIS, const char *devname, int iscapture)
{
    SDL_AudioFormat test_format;
    int valid_datatype = 0;
    
    if (iscapture) {
    	//TODO: implement capture
    	SDL_SetError("Capture not supported on Android");
    	return 0;
    }

    if (audioDevice != NULL) {
    	SDL_SetError("Only one audio device at a time please!");
    	return 0;
    }

    audioDevice = this;

    this->hidden = SDL_malloc(sizeof(*(this->hidden)));
    if (!this->hidden) {
        SDL_OutOfMemory();
        return 0;
    }
    SDL_memset(this->hidden, 0, (sizeof *this->hidden));

    test_format = SDL_FirstAudioFormat(this->spec.format);
    while (test_format != 0) { // no "UNKNOWN" constant
        if ((test_format == AUDIO_U8) || (test_format == AUDIO_S16LSB)) {
            this->spec.format = test_format;
            break;
        }
        test_format = SDL_NextAudioFormat();
    }
    
    if (test_format == 0) {
    	// Didn't find a compatible format :(
    	SDL_SetError("No compatible audio format!");
    	return 0;
    }

    if (this->spec.channels > 1) {
    	this->spec.channels = 2;
    } else {
    	this->spec.channels = 1;
    }

    if (this->spec.freq < 8000) {
    	this->spec.freq = 8000;
    }
    if (this->spec.freq > 48000) {
    	this->spec.freq = 48000;
    }

    // TODO: pass in/return a (Java) device ID, also whether we're opening for input or output
    this->spec.samples = Android_JNI_OpenAudioDevice(this->spec.freq, this->spec.format == AUDIO_U8 ? 0 : 1, this->spec.channels, this->spec.samples);
    SDL_CalculateAudioSpec(&this->spec);

    if (this->spec.samples == 0) {
    	// Init failed?
    	SDL_SetError("Java-side initialization failed!");
    	return 0;
    }

    return 1;
}

static void
AndroidAUD_PlayDevice(_THIS)
{
    Android_JNI_WriteAudioBuffer();
}

static Uint8 *
AndroidAUD_GetDeviceBuf(_THIS)
{
    return Android_JNI_GetAudioBuffer();
}

static void
AndroidAUD_CloseDevice(_THIS)
{
    if (this->hidden != NULL) {
    	SDL_free(this->hidden);
    	this->hidden = NULL;
    }
	Android_JNI_CloseAudioDevice();

    if (audioDevice == this) {
    	audioDevice = NULL;
    }
}

static int
AndroidAUD_Init(SDL_AudioDriverImpl * impl)
{
    /* Set the function pointers */
    impl->OpenDevice = AndroidAUD_OpenDevice;
    impl->PlayDevice = AndroidAUD_PlayDevice;
    impl->GetDeviceBuf = AndroidAUD_GetDeviceBuf;
    impl->CloseDevice = AndroidAUD_CloseDevice;

    /* and the capabilities */
    impl->ProvidesOwnCallbackThread = 1;
    impl->HasCaptureSupport = 0; //TODO
    impl->OnlyHasDefaultOutputDevice = 1;
    impl->OnlyHasDefaultInputDevice = 1;

    return 1;   /* this audio target is available. */
}

AudioBootStrap ANDROIDAUD_bootstrap = {
    "android", "SDL Android audio driver", AndroidAUD_Init, 0       /*1? */
};

/* Called by the Java code to start the audio processing on a thread */
void
Android_RunAudioThread()
{
	SDL_RunAudio(audioDevice);
}

/* vi: set ts=4 sw=4 expandtab: */