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SDL_androidaudio.c
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/*
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"
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#include "../../SDL_android.h"
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#include <android/log.h>
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static void * audioDevice;
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static int
AndroidAUD_OpenDevice(_THIS, const char *devname, int iscapture)
{
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SDL_AudioFormat test_format;
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int valid_datatype = 0;
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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;
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this->hidden = SDL_malloc(sizeof(*(this->hidden)));
if (!this->hidden) {
SDL_OutOfMemory();
return 0;
}
SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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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;
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break;
}
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test_format = SDL_NextAudioFormat();
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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;
}
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return 1;
}
static void
AndroidAUD_PlayDevice(_THIS)
{
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Android_JNI_WriteAudioBuffer();
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}
static Uint8 *
AndroidAUD_GetDeviceBuf(_THIS)
{
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return Android_JNI_GetAudioBuffer();
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}
static void
AndroidAUD_CloseDevice(_THIS)
{
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if (this->hidden != NULL) {
SDL_free(this->hidden);
this->hidden = NULL;
}
Android_JNI_CloseAudioDevice();
if (audioDevice == this) {
audioDevice = NULL;
}
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}
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 */
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impl->ProvidesOwnCallbackThread = 1;
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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? */
};
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/* Called by the Java code to start the audio processing on a thread */
void
Android_RunAudioThread()
{
SDL_RunAudio(audioDevice);
}
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/* vi: set ts=4 sw=4 expandtab: */