--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/audio/iphoneos/SDL_coreaudio_iphone.c	Sat Oct 04 06:46:59 2008 +0000
@@ -0,0 +1,340 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2006 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"
+
+#include <AudioUnit/AudioUnit.h>
+
+#include "SDL_audio.h"
+#include "../SDL_audio_c.h"
+#include "../SDL_sysaudio.h"
+#include "SDL_coreaudio_iphone.h"
+
+#define DEBUG_COREAUDIO 0
+
+static void
+COREAUDIO_Deinitialize(void)
+{
+}
+
+/* The CoreAudio callback */
+static OSStatus
+outputCallback(void *inRefCon,
+               AudioUnitRenderActionFlags * ioActionFlags,
+               const AudioTimeStamp * inTimeStamp,
+               UInt32 inBusNumber, UInt32 inNumberFrames,
+               AudioBufferList * ioDataList)
+{
+    SDL_AudioDevice *this = (SDL_AudioDevice *) inRefCon;
+    AudioBuffer *ioData = &ioDataList->mBuffers[0];
+    UInt32 remaining, len;
+    void *ptr;
+
+    /* Is there ever more than one buffer, and what do you do with it? */
+    if (ioDataList->mNumberBuffers != 1) {
+        return noErr;
+    }
+
+    /* Only do anything if audio is enabled and not paused */
+    if (!this->enabled || this->paused) {
+        SDL_memset(ioData->mData, this->spec.silence, ioData->mDataByteSize);
+        return 0;
+    }
+
+    /* No SDL conversion should be needed here, ever, since we accept
+       any input format in OpenAudio, and leave the conversion to CoreAudio.
+     */
+    /*
+       assert(!this->convert.needed);
+       assert(this->spec.channels == ioData->mNumberChannels);
+     */
+
+    remaining = ioData->mDataByteSize;
+    ptr = ioData->mData;
+    while (remaining > 0) {
+        if (this->hidden->bufferOffset >= this->hidden->bufferSize) {
+            /* Generate the data */
+            SDL_memset(this->hidden->buffer, this->spec.silence,
+                       this->hidden->bufferSize);
+            SDL_mutexP(this->mixer_lock);
+            (*this->spec.callback) (this->spec.userdata, this->hidden->buffer,
+                                    this->hidden->bufferSize);
+            SDL_mutexV(this->mixer_lock);
+            this->hidden->bufferOffset = 0;
+        }
+
+        len = this->hidden->bufferSize - this->hidden->bufferOffset;
+        if (len > remaining)
+            len = remaining;
+        SDL_memcpy(ptr,
+                   (char *) this->hidden->buffer + this->hidden->bufferOffset,
+                   len);
+        ptr = (char *) ptr + len;
+        remaining -= len;
+        this->hidden->bufferOffset += len;
+    }
+
+    return 0;
+}
+
+static OSStatus
+inputCallback(void *inRefCon,
+              AudioUnitRenderActionFlags * ioActionFlags,
+              const AudioTimeStamp * inTimeStamp,
+              UInt32 inBusNumber, UInt32 inNumberFrames,
+              AudioBufferList * ioData)
+{
+    //err = AudioUnitRender(afr->fAudioUnit, ioActionFlags, inTimeStamp, inBusNumber, inNumberFrames, afr->fAudioBuffer);
+    // !!! FIXME: write me!
+    return noErr;
+}
+
+
+static void
+COREAUDIO_CloseDevice(_THIS)
+{
+    if (this->hidden != NULL) {
+        if (this->hidden->audioUnitOpened) {
+            OSStatus result = noErr;
+            AURenderCallbackStruct callback;
+            const AudioUnitElement output_bus = 0;
+            const AudioUnitElement input_bus = 1;
+            const int iscapture = this->iscapture;
+            const AudioUnitElement bus =
+                ((iscapture) ? input_bus : output_bus);
+            const AudioUnitScope scope =
+                ((iscapture) ? kAudioUnitScope_Output :
+                 kAudioUnitScope_Input);
+
+            /* stop processing the audio unit */
+            result = AudioOutputUnitStop(this->hidden->audioUnit);
+
+            /* Remove the input callback */
+            SDL_memset(&callback, '\0', sizeof(AURenderCallbackStruct));
+            result = AudioUnitSetProperty(this->hidden->audioUnit,
+                                          kAudioUnitProperty_SetRenderCallback,
+                                          scope, bus, &callback,
+                                          sizeof(callback));
+
+            //CloseComponent(this->hidden->audioUnit);
+            this->hidden->audioUnitOpened = 0;
+        }
+        SDL_free(this->hidden->buffer);
+        SDL_free(this->hidden);
+        this->hidden = NULL;
+    }
+}
+
+
+#define CHECK_RESULT(msg) \
+    if (result != noErr) { \
+        COREAUDIO_CloseDevice(this); \
+        SDL_SetError("CoreAudio error (%s): %d", msg, result); \
+        return 0; \
+    }
+
+static int
+prepare_audiounit(_THIS, const char *devname, int iscapture,
+                  const AudioStreamBasicDescription * strdesc)
+{
+    OSStatus result = noErr;
+    AURenderCallbackStruct callback;
+    AudioComponentDescription desc;
+    AudioComponent comp = NULL;
+
+    UInt32 enableIO = 0;
+    const AudioUnitElement output_bus = 0;
+    const AudioUnitElement input_bus = 1;
+    const AudioUnitElement bus = ((iscapture) ? input_bus : output_bus);
+    const AudioUnitScope scope = ((iscapture) ? kAudioUnitScope_Output :
+                                  kAudioUnitScope_Input);
+
+    SDL_memset(&desc, '\0', sizeof(AudioComponentDescription));
+    desc.componentType = kAudioUnitType_Output;
+    desc.componentSubType = kAudioUnitSubType_RemoteIO;
+    desc.componentManufacturer = kAudioUnitManufacturer_Apple;
+
+    comp = AudioComponentFindNext(NULL, &desc);
+    if (comp == NULL) {
+        SDL_SetError("Couldn't find requested CoreAudio component");
+        return 0;
+    }
+
+    /* Open & initialize the audio unit */
+    /*
+       AudioComponentInstanceNew only available on iPhone OS 2.0 and Mac OS X 10.6  
+       We can't use OpenAComponent on iPhone because it is not present
+     */
+    result = AudioComponentInstanceNew(comp, &this->hidden->audioUnit);
+    CHECK_RESULT("AudioComponentInstanceNew");
+
+    this->hidden->audioUnitOpened = 1;
+
+    // !!! FIXME: this is wrong?
+    enableIO = ((iscapture) ? 1 : 0);
+    result = AudioUnitSetProperty(this->hidden->audioUnit,
+                                  kAudioOutputUnitProperty_EnableIO,
+                                  kAudioUnitScope_Input, input_bus,
+                                  &enableIO, sizeof(enableIO));
+    CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_EnableIO input)");
+
+    // !!! FIXME: this is wrong?
+    enableIO = ((iscapture) ? 0 : 1);
+    result = AudioUnitSetProperty(this->hidden->audioUnit,
+                                  kAudioOutputUnitProperty_EnableIO,
+                                  kAudioUnitScope_Output, output_bus,
+                                  &enableIO, sizeof(enableIO));
+    CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_EnableIO output)");
+
+    /*result = AudioUnitSetProperty(this->hidden->audioUnit,
+       kAudioOutputUnitProperty_CurrentDevice,
+       kAudioUnitScope_Global, 0,
+       &this->hidden->deviceID,
+       sizeof(AudioDeviceID));
+
+       CHECK_RESULT("AudioUnitSetProperty (kAudioOutputUnitProperty_CurrentDevice)"); */
+
+    /* Set the data format of the audio unit. */
+    result = AudioUnitSetProperty(this->hidden->audioUnit,
+                                  kAudioUnitProperty_StreamFormat,
+                                  scope, bus, strdesc, sizeof(*strdesc));
+    CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_StreamFormat)");
+
+    /* Set the audio callback */
+    SDL_memset(&callback, '\0', sizeof(AURenderCallbackStruct));
+    callback.inputProc = ((iscapture) ? inputCallback : outputCallback);
+    callback.inputProcRefCon = this;
+    result = AudioUnitSetProperty(this->hidden->audioUnit,
+                                  kAudioUnitProperty_SetRenderCallback,
+                                  scope, bus, &callback, sizeof(callback));
+    CHECK_RESULT
+        ("AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)");
+
+    /* Calculate the final parameters for this audio specification */
+    SDL_CalculateAudioSpec(&this->spec);
+
+    /* Allocate a sample buffer */
+    this->hidden->bufferOffset = this->hidden->bufferSize = this->spec.size;
+    this->hidden->buffer = SDL_malloc(this->hidden->bufferSize);
+
+    result = AudioUnitInitialize(this->hidden->audioUnit);
+    CHECK_RESULT("AudioUnitInitialize");
+
+    /* Finally, start processing of the audio unit */
+    result = AudioOutputUnitStart(this->hidden->audioUnit);
+    CHECK_RESULT("AudioOutputUnitStart");
+    /* We're running! */
+    return 1;
+}
+
+static int
+COREAUDIO_OpenDevice(_THIS, const char *devname, int iscapture)
+{
+    AudioStreamBasicDescription strdesc;
+    SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format);
+    int valid_datatype = 0;
+
+    /* Initialize all variables that we clean on shutdown */
+    this->hidden = (struct SDL_PrivateAudioData *)
+        SDL_malloc((sizeof *this->hidden));
+    if (this->hidden == NULL) {
+        SDL_OutOfMemory();
+        return (0);
+    }
+    SDL_memset(this->hidden, 0, (sizeof *this->hidden));
+
+    /* Setup a AudioStreamBasicDescription with the requested format */
+    SDL_memset(&strdesc, '\0', sizeof(AudioStreamBasicDescription));
+    strdesc.mFormatID = kAudioFormatLinearPCM;
+    strdesc.mFormatFlags = kLinearPCMFormatFlagIsPacked;
+    strdesc.mChannelsPerFrame = this->spec.channels;
+    strdesc.mSampleRate = this->spec.freq;
+    strdesc.mFramesPerPacket = 1;
+
+    while ((!valid_datatype) && (test_format)) {
+        this->spec.format = test_format;
+        /* Just a list of valid SDL formats, so people don't pass junk here. */
+        switch (test_format) {
+        case AUDIO_U8:
+        case AUDIO_S8:
+        case AUDIO_U16LSB:
+        case AUDIO_S16LSB:
+        case AUDIO_U16MSB:
+        case AUDIO_S16MSB:
+        case AUDIO_S32LSB:
+        case AUDIO_S32MSB:
+        case AUDIO_F32LSB:
+        case AUDIO_F32MSB:
+            valid_datatype = 1;
+            strdesc.mBitsPerChannel = SDL_AUDIO_BITSIZE(this->spec.format);
+            if (SDL_AUDIO_ISBIGENDIAN(this->spec.format))
+                strdesc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
+
+            if (SDL_AUDIO_ISFLOAT(this->spec.format))
+                strdesc.mFormatFlags |= kLinearPCMFormatFlagIsFloat;
+            else if (SDL_AUDIO_ISSIGNED(this->spec.format))
+                strdesc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;
+            break;
+        }
+    }
+
+    if (!valid_datatype) {      /* shouldn't happen, but just in case... */
+        COREAUDIO_CloseDevice(this);
+        SDL_SetError("Unsupported audio format");
+        return 0;
+    }
+
+    strdesc.mBytesPerFrame =
+        strdesc.mBitsPerChannel * strdesc.mChannelsPerFrame / 8;
+    strdesc.mBytesPerPacket =
+        strdesc.mBytesPerFrame * strdesc.mFramesPerPacket;
+
+    if (!prepare_audiounit(this, devname, iscapture, &strdesc)) {
+        COREAUDIO_CloseDevice(this);
+        return 0;               /* prepare_audiounit() will call SDL_SetError()... */
+    }
+
+    return 1;                   /* good to go. */
+}
+
+static int
+COREAUDIO_Init(SDL_AudioDriverImpl * impl)
+{
+    /* Set the function pointers */
+    impl->OpenDevice = COREAUDIO_OpenDevice;
+    impl->CloseDevice = COREAUDIO_CloseDevice;
+    impl->Deinitialize = COREAUDIO_Deinitialize;
+    impl->ProvidesOwnCallbackThread = 1;
+
+    /* added for iPhone */
+    impl->OnlyHasDefaultInputDevice = 1;
+    impl->OnlyHasDefaultOutputDevice = 1;
+    impl->HasCaptureSupport = 0;        /* still needs to be written */
+
+    return 1;
+}
+
+AudioBootStrap COREAUDIOIPHONE_bootstrap = {
+    "coreaudio-iphoneos", "SDL CoreAudio (iPhone OS) audio driver",
+    COREAUDIO_Init, 0
+};
+
+/* vi: set ts=4 sw=4 expandtab: */