/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/** \file SDL.c SDL platform implementation */
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#include "sles_allinclusive.h"
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/** \brief Called by SDL to fill the next audio output buffer */
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static void SDLCALL SDL_callback(void *context, Uint8 *stream, int len)
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{
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assert(len > 0);
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IEngine *thisEngine = (IEngine *) context;
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// A peek lock would be risky if output mixes are dynamic, so we use SDL_PauseAudio to
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// temporarily disable callbacks during any change to the current output mix, and use a
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// shared lock here
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interface_lock_shared(thisEngine);
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COutputMix *outputMix = thisEngine->mOutputMix;
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interface_unlock_shared(thisEngine);
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if (NULL != outputMix) {
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SLOutputMixExtItf OutputMixExt = &outputMix->mOutputMixExt.mItf;
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IOutputMixExt_FillBuffer(OutputMixExt, stream, (SLuint32) len);
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} else {
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memset(stream, 0, (size_t) len);
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}
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}
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/** \brief Called during slCreateEngine to initialize SDL */
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void SDL_open(IEngine *thisEngine)
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{
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SDL_AudioSpec fmt;
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fmt.freq = 44100;
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fmt.format = AUDIO_S16;
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fmt.channels = STEREO_CHANNELS;
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#ifdef _WIN32 // FIXME Either a bug or a serious misunderstanding
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fmt.samples = SndFile_BUFSIZE;
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#else
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fmt.samples = SndFile_BUFSIZE / sizeof(short);
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#endif
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fmt.callback = SDL_callback;
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fmt.userdata = (void *) thisEngine;
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if (SDL_OpenAudio(&fmt, NULL) < 0) {
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SL_LOGE("Unable to open audio: %s", SDL_GetError());
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exit(EXIT_FAILURE);
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}
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}
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/** \brief Called during Object::Destroy for engine to shutdown SDL */
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void SDL_close(void)
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{
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SDL_CloseAudio();
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}
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