/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Library General Public

License as published by the Free Software Foundation; either

version 2 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

Library General Public License for more details.

You should have received a copy of the GNU Library General Public

License along with this library; if not, write to the Free

Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

Sam Lantinga

slouken@libsdl.org

This file based on Apple sample code. We haven't changed the file name,

so if you want to see the original search for it on apple.com/developer

*/

/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

AudioFilePlayer.cpp

*/

#include "AudioFilePlayer.h"

/*

void ThrowResult (OSStatus result, const char* str)

{

SDL_SetError ("Error: %s %d", str, result);

throw result;

}

*/

#if DEBUG

static void PrintStreamDesc (AudioStreamBasicDescription *inDesc)

{

if (!inDesc) {

printf ("Can't print a NULL desc!\n");

return;

}

printf ("- - - - - - - - - - - - - - - - - - - -\n");

printf (" Sample Rate:%f\n", inDesc->mSampleRate);

printf (" Format ID:%s\n", (char*)&inDesc->mFormatID);

printf (" Format Flags:%lX\n", inDesc->mFormatFlags);

printf (" Bytes per Packet:%ld\n", inDesc->mBytesPerPacket);

printf (" Frames per Packet:%ld\n", inDesc->mFramesPerPacket);

printf (" Bytes per Frame:%ld\n", inDesc->mBytesPerFrame);

printf (" Channels per Frame:%ld\n", inDesc->mChannelsPerFrame);

printf (" Bits per Channel:%ld\n", inDesc->mBitsPerChannel);

printf ("- - - - - - - - - - - - - - - - - - - -\n");

}

#endif

static int AudioFilePlayer_SetDestination (AudioFilePlayer *afp, AudioUnit *inDestUnit)

{

if (afp->mConnected)

return 0 ;

OSStatus result = noErr;

ComponentDescription desc;

result = GetComponentInfo ((Component)*inDestUnit, &desc, 0, 0, 0);

/* we're going to use this to know which convert routine to call

a v1 audio unit will have a type of 'aunt'

a v2 audio unit will have one of several different types. */

if (desc.componentType != kAudioUnitComponentType) {

result = badComponentInstance;

if (result) return 0;

}

/* Set the input format of the audio unit. */

result = AudioUnitSetProperty (*inDestUnit,

kAudioUnitProperty_StreamFormat,

kAudioUnitScope_Input,

0,

&afp->mFileDescription,

sizeof (afp->mFileDescription));

if (result) return 0;

return 1;

}

static void AudioFilePlayer_SetNotifier(AudioFilePlayer *afp, AudioFilePlayNotifier inNotifier, void *inRefCon)

{

afp->mNotifier = inNotifier;

afp->mRefCon = inRefCon;

}

static int AudioFilePlayer_IsConnected(AudioFilePlayer *afp)

{

return afp->mConnected;

}

static AudioUnit AudioFilePlayer_GetDestUnit(AudioFilePlayer *afp)

{

return afp->mPlayUnit;

}

static void AudioFilePlayer_Print(AudioFilePlayer *afp)

{

#if DEBUG

printf ("Is Connected:%s\n", (IsConnected() ? "true" : "false"));

printf ("- - - - - - - - - - - - - - \n");

#endif

}

static void AudioFilePlayer_SetStartFrame (AudioFilePlayer *afp, int frame)

{

SInt64 position = frame * 2352;

afp->mStartFrame = frame;

afp->mAudioFileManager->SetPosition (afp->mAudioFileManager, position);

}

static int AudioFilePlayer_GetCurrentFrame (AudioFilePlayer *afp)

{

return afp->mStartFrame + (afp->mAudioFileManager->GetByteCounter(afp->mAudioFileManager) / 2352);

}

static void AudioFilePlayer_SetStopFrame (AudioFilePlayer *afp, int frame)

{

SInt64 position = frame * 2352;

afp->mAudioFileManager->SetEndOfFile (afp->mAudioFileManager, position);

}

void delete_AudioFilePlayer(AudioFilePlayer *afp)

{

if (afp != NULL)

{

afp->Disconnect(afp);

if (afp->mAudioFileManager) {

delete_AudioFileManager(afp->mAudioFileManager);

afp->mAudioFileManager = 0;

}

if (afp->mForkRefNum) {

FSClose (afp->mForkRefNum);

afp->mForkRefNum = 0;

}

}

}

static int AudioFilePlayer_Connect(AudioFilePlayer *afp)

{

#if DEBUG

printf ("Connect:%x, engaged=%d\n", (int)afp->mPlayUnit, (afp->mConnected ? 1 : 0));

#endif

if (!afp->mConnected)

{

if (!afp->mAudioFileManager->DoConnect(afp->mAudioFileManager))

return 0;

afp->mInputCallback.inputProc = afp->mAudioFileManager->FileInputProc;

afp->mInputCallback.inputProcRefCon = afp->mAudioFileManager;

OSStatus result = AudioUnitSetProperty (afp->mPlayUnit,

kAudioUnitProperty_SetInputCallback,

kAudioUnitScope_Input,

0,

&afp->mInputCallback,

sizeof(afp->mInputCallback));

afp->mConnected = 1;

}

return 1;

}

/* warning noted, now please go away ;-) */

/* #warning This should redirect the calling of notification code to some other thread */

static void AudioFilePlayer_DoNotification (AudioFilePlayer *afp, OSStatus inStatus)

{

if (afp->mNotifier) {

(*afp->mNotifier) (afp->mRefCon, inStatus);

} else {

SDL_SetError ("Notification posted with no notifier in place");

if (inStatus == kAudioFilePlay_FileIsFinished)

afp->Disconnect(afp);

else if (inStatus != kAudioFilePlayErr_FilePlayUnderrun)

afp->Disconnect(afp);

}

}

static void AudioFilePlayer_Disconnect (AudioFilePlayer *afp)

{

#if DEBUG

printf ("Disconnect:%x,%ld, engaged=%d\n", (int)afp->mPlayUnit, 0, (afp->mConnected ? 1 : 0));

#endif

if (afp->mConnected)

{

afp->mConnected = 0;

afp->mInputCallback.inputProc = 0;

afp->mInputCallback.inputProcRefCon = 0;

OSStatus result = AudioUnitSetProperty (afp->mPlayUnit,

kAudioUnitProperty_SetInputCallback,

kAudioUnitScope_Input,

0,

&afp->mInputCallback,

sizeof(afp->mInputCallback));

if (result)

SDL_SetError ("AudioUnitSetProperty:RemoveInputCallback:%ld", result);

afp->mAudioFileManager->Disconnect(afp->mAudioFileManager);

}

}

typedef struct {

UInt32 offset;

UInt32 blockSize;

} SSNDData;

static int AudioFilePlayer_OpenFile (AudioFilePlayer *afp, const FSRef *inRef, SInt64 *outFileDataSize)

{

ContainerChunk chunkHeader;

ChunkHeader chunk;

SSNDData ssndData;

OSErr result;

HFSUniStr255 dfName;

ByteCount actual;

SInt64 offset;

result = FSOpenFork(inRef, dfName.length, dfName.unicode, fsRdPerm, &afp->mForkRefNum);

if (chunkHeader.ckID != 'FORM') {

result = -1;

}

if (chunkHeader.formType != 'AIFC') {

result = -1;

}

/* Search for the SSND chunk. We ignore all compression etc. information

in other chunks. Of course that is kind of evil, but for now we are lazy

and rely on the cdfs to always give us the same fixed format.

TODO: Parse the COMM chunk we currently skip to fill in mFileDescription.

*/

offset = 0;

do {

result = FSReadFork(afp->mForkRefNum, fsFromMark, offset, sizeof(chunk), &chunk, &actual);

offset = chunk.ckSize;

} while (chunk.ckID != 'SSND');

/* Read the header of the SSND chunk. After this, we are positioned right

at the start of the audio data. */

result = FSSetForkPosition(afp->mForkRefNum, fsFromMark, ssndData.offset);

*outFileDataSize = chunk.ckSize - ssndData.offset - 8;

afp->mFileDescription.mSampleRate = 44100;

afp->mFileDescription.mFormatID = kAudioFormatLinearPCM;

afp->mFileDescription.mFormatFlags = kLinearPCMFormatFlagIsPacked | kLinearPCMFormatFlagIsSignedInteger;

afp->mFileDescription.mBytesPerPacket = 4;

afp->mFileDescription.mFramesPerPacket = 1;

afp->mFileDescription.mBytesPerFrame = 4;

afp->mFileDescription.mChannelsPerFrame = 2;

afp->mFileDescription.mBitsPerChannel = 16;

return 1;

}

AudioFilePlayer *new_AudioFilePlayer (const FSRef *inFileRef)

{

SInt64 fileDataSize = 0;

if (afp == NULL)

return NULL;

#define SET_AUDIOFILEPLAYER_METHOD(m) afp->m = AudioFilePlayer_##m

SET_AUDIOFILEPLAYER_METHOD(SetDestination);

SET_AUDIOFILEPLAYER_METHOD(SetNotifier);

SET_AUDIOFILEPLAYER_METHOD(SetStartFrame);

SET_AUDIOFILEPLAYER_METHOD(GetCurrentFrame);

SET_AUDIOFILEPLAYER_METHOD(SetStopFrame);

SET_AUDIOFILEPLAYER_METHOD(Connect);

SET_AUDIOFILEPLAYER_METHOD(Disconnect);

SET_AUDIOFILEPLAYER_METHOD(DoNotification);

SET_AUDIOFILEPLAYER_METHOD(IsConnected);

SET_AUDIOFILEPLAYER_METHOD(GetDestUnit);

SET_AUDIOFILEPLAYER_METHOD(Print);

SET_AUDIOFILEPLAYER_METHOD(OpenFile);

#undef SET_AUDIOFILEPLAYER_METHOD

if (!afp->OpenFile (afp, inFileRef, &fileDataSize))

{

return NULL;

}

int bytesPerSecond = (UInt32) (4 * afp->mFileDescription.mSampleRate * afp->mFileDescription.mBytesPerFrame);

#if DEBUG

printf("File format:\n");

PrintStreamDesc (&afp->mFileDescription);

#endif

afp->mAudioFileManager = new_AudioFileManager(afp, afp->mForkRefNum,

fileDataSize,

bytesPerSecond);

if (afp->mAudioFileManager == NULL)

{

delete_AudioFilePlayer(afp);

return NULL;

}

return afp;

}