This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
SDL_androidaudio.c
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Simple DirectMedia Layer
Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
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*/
#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 "../../core/android/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: */