1b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten/* 2b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten * Copyright (C) 2010 The Android Open Source Project 3b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten * 4b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten * Licensed under the Apache License, Version 2.0 (the "License"); 5b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten * you may not use this file except in compliance with the License. 6b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten * You may obtain a copy of the License at 7b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten * 8b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten * http://www.apache.org/licenses/LICENSE-2.0 9b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten * 10b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten * Unless required by applicable law or agreed to in writing, software 11b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten * distributed under the License is distributed on an "AS IS" BASIS, 12b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten * See the License for the specific language governing permissions and 14b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten * limitations under the License. 15b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten */ 16b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten 17369f3138f19f7102bf0f98b890ab84c8df633a93Glenn Kasten/** \file SDL.c SDL platform implementation */ 18b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten 19b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten#include "sles_allinclusive.h" 20b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten 21b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten 22369f3138f19f7102bf0f98b890ab84c8df633a93Glenn Kasten/** \brief Called by SDL to fill the next audio output buffer */ 23369f3138f19f7102bf0f98b890ab84c8df633a93Glenn Kasten 24b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kastenstatic void SDLCALL SDL_callback(void *context, Uint8 *stream, int len) 25b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten{ 26b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten assert(len > 0); 2700d2d554e04ac369367c903dbf53b975355d1bcdGlenn Kasten IEngine *thisEngine = (IEngine *) context; 28673c20563ade6ab6847e684df62b5c5a8e3b1d50Glenn Kasten // A peek lock would be risky if output mixes are dynamic, so we use SDL_PauseAudio to 29673c20563ade6ab6847e684df62b5c5a8e3b1d50Glenn Kasten // temporarily disable callbacks during any change to the current output mix, and use a 30673c20563ade6ab6847e684df62b5c5a8e3b1d50Glenn Kasten // shared lock here 3100d2d554e04ac369367c903dbf53b975355d1bcdGlenn Kasten interface_lock_shared(thisEngine); 3200d2d554e04ac369367c903dbf53b975355d1bcdGlenn Kasten COutputMix *outputMix = thisEngine->mOutputMix; 3300d2d554e04ac369367c903dbf53b975355d1bcdGlenn Kasten interface_unlock_shared(thisEngine); 3400d2d554e04ac369367c903dbf53b975355d1bcdGlenn Kasten if (NULL != outputMix) { 3500d2d554e04ac369367c903dbf53b975355d1bcdGlenn Kasten SLOutputMixExtItf OutputMixExt = &outputMix->mOutputMixExt.mItf; 36e5d006b298ce7683d66f7ec86136403cf5fb20d6Glenn Kasten IOutputMixExt_FillBuffer(OutputMixExt, stream, (SLuint32) len); 3700d2d554e04ac369367c903dbf53b975355d1bcdGlenn Kasten } else { 3800d2d554e04ac369367c903dbf53b975355d1bcdGlenn Kasten memset(stream, 0, (size_t) len); 3900d2d554e04ac369367c903dbf53b975355d1bcdGlenn Kasten } 40b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten} 41b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten 42369f3138f19f7102bf0f98b890ab84c8df633a93Glenn Kasten 43369f3138f19f7102bf0f98b890ab84c8df633a93Glenn Kasten/** \brief Called during slCreateEngine to initialize SDL */ 44369f3138f19f7102bf0f98b890ab84c8df633a93Glenn Kasten 45768edbc2a8e7f197548cf1141689dd237d19c455Glenn Kastenvoid SDL_open(IEngine *thisEngine) 46b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten{ 47b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten SDL_AudioSpec fmt; 48b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten fmt.freq = 44100; 49b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten fmt.format = AUDIO_S16; 50e5bf0d2c9531a7064eb3ddcafaf93ac1b0974037Glenn Kasten fmt.channels = STEREO_CHANNELS; 517324a5ab12cc734e2feb4cef8baeda26566d3c92Glenn Kasten#ifdef _WIN32 // FIXME Either a bug or a serious misunderstanding 526a357b8fa57b0bc1557cd5ab9f9fb86aabaaa18cGlenn Kasten fmt.samples = SndFile_BUFSIZE; 537324a5ab12cc734e2feb4cef8baeda26566d3c92Glenn Kasten#else 54e5bf0d2c9531a7064eb3ddcafaf93ac1b0974037Glenn Kasten fmt.samples = SndFile_BUFSIZE / sizeof(short); 557324a5ab12cc734e2feb4cef8baeda26566d3c92Glenn Kasten#endif 56b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten fmt.callback = SDL_callback; 5700d2d554e04ac369367c903dbf53b975355d1bcdGlenn Kasten fmt.userdata = (void *) thisEngine; 58b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten 59b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten if (SDL_OpenAudio(&fmt, NULL) < 0) { 604b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten SL_LOGE("Unable to open audio: %s", SDL_GetError()); 614b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten exit(EXIT_FAILURE); 62b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten } 63b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten} 64b7154f2324c8ae44b820c07c69aaa80a4bb9e418Glenn Kasten 65768edbc2a8e7f197548cf1141689dd237d19c455Glenn Kasten 66768edbc2a8e7f197548cf1141689dd237d19c455Glenn Kasten/** \brief Called during Object::Destroy for engine to shutdown SDL */ 67768edbc2a8e7f197548cf1141689dd237d19c455Glenn Kasten 68768edbc2a8e7f197548cf1141689dd237d19c455Glenn Kastenvoid SDL_close(void) 69768edbc2a8e7f197548cf1141689dd237d19c455Glenn Kasten{ 70768edbc2a8e7f197548cf1141689dd237d19c455Glenn Kasten SDL_CloseAudio(); 71768edbc2a8e7f197548cf1141689dd237d19c455Glenn Kasten} 72