src/cdrom/macosx/AudioFilePlayer.c
author Sam Lantinga <slouken@libsdl.org>
Tue, 07 Feb 2006 06:59:48 +0000
changeset 1336 3692456e7b0f
parent 1143 71a2648acc75
child 1402 d910939febfa
permissions -rw-r--r--
Use SDL_ prefixed versions of C library functions. FIXME: Change #include <stdlib.h> to #include "SDL_stdlib.h" Change #include <string.h> to #include "SDL_string.h" Make sure nothing else broke because of this...
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@libsdl.org
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    This file based on Apple sample code. We haven't changed the file name, 
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    so if you want to see the original search for it on apple.com/developer
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*/
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//  AudioFilePlayer.cpp
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//
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#include "AudioFilePlayer.h"
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/*
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void ThrowResult (OSStatus result, const char* str)
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{
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    SDL_SetError ("Error: %s %d", str, result);
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    throw result;
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}
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*/
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#if DEBUG
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static void PrintStreamDesc (AudioStreamBasicDescription *inDesc)
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{
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    if (!inDesc) {
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        printf ("Can't print a NULL desc!\n");
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        return;
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    }
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    printf ("- - - - - - - - - - - - - - - - - - - -\n");
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    printf ("  Sample Rate:%f\n", inDesc->mSampleRate);
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    printf ("  Format ID:%s\n", (char*)&inDesc->mFormatID);
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    printf ("  Format Flags:%lX\n", inDesc->mFormatFlags);
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    printf ("  Bytes per Packet:%ld\n", inDesc->mBytesPerPacket);
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    printf ("  Frames per Packet:%ld\n", inDesc->mFramesPerPacket);
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    printf ("  Bytes per Frame:%ld\n", inDesc->mBytesPerFrame);
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    printf ("  Channels per Frame:%ld\n", inDesc->mChannelsPerFrame);
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    printf ("  Bits per Channel:%ld\n", inDesc->mBitsPerChannel);
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    printf ("- - - - - - - - - - - - - - - - - - - -\n");
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}
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#endif
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static int AudioFilePlayer_SetDestination (AudioFilePlayer *afp, AudioUnit  *inDestUnit)
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{
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    //if (afp->mConnected) throw static_cast<OSStatus>(-1); //can't set dest if already engaged
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    if (afp->mConnected)
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        return 0 ;
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    SDL_memcpy(&afp->mPlayUnit, inDestUnit, sizeof (afp->mPlayUnit));
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    OSStatus result = noErr;
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        //we can "down" cast a component instance to a component
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    ComponentDescription desc;
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    result = GetComponentInfo ((Component)*inDestUnit, &desc, 0, 0, 0);
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    if (result) return 0; //THROW_RESULT("GetComponentInfo")
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        // we're going to use this to know which convert routine to call
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        // a v1 audio unit will have a type of 'aunt'
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        // a v2 audio unit will have one of several different types.
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    if (desc.componentType != kAudioUnitComponentType) {
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        result = badComponentInstance;
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        //THROW_RESULT("BAD COMPONENT")
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        if (result) return 0;
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    }
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    /* Set the input format of the audio unit. */
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    result = AudioUnitSetProperty (*inDestUnit,
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                               kAudioUnitProperty_StreamFormat,
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                               kAudioUnitScope_Input,
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                               0,
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                               &afp->mFileDescription,
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                               sizeof (afp->mFileDescription));
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        //THROW_RESULT("AudioUnitSetProperty")
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    if (result) return 0;
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    return 1;
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}
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static void AudioFilePlayer_SetNotifier(AudioFilePlayer *afp, AudioFilePlayNotifier inNotifier, void *inRefCon)
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{
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    afp->mNotifier = inNotifier;
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    afp->mRefCon = inRefCon;
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}
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static int AudioFilePlayer_IsConnected(AudioFilePlayer *afp)
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{
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    return afp->mConnected;
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}
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static AudioUnit AudioFilePlayer_GetDestUnit(AudioFilePlayer *afp)
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{
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   return afp->mPlayUnit;
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}
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static void AudioFilePlayer_Print(AudioFilePlayer *afp)
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{
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#if DEBUG    
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    printf ("Is Connected:%s\n", (IsConnected() ? "true" : "false"));
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    printf ("- - - - - - - - - - - - - - \n");
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#endif
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}
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static void    AudioFilePlayer_SetStartFrame (AudioFilePlayer *afp, int frame)
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{
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    SInt64 position = frame * 2352;
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    afp->mStartFrame = frame;
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    afp->mAudioFileManager->SetPosition (afp->mAudioFileManager, position);
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}
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static int    AudioFilePlayer_GetCurrentFrame (AudioFilePlayer *afp)
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{
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    return afp->mStartFrame + (afp->mAudioFileManager->GetByteCounter(afp->mAudioFileManager) / 2352);
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}
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static void    AudioFilePlayer_SetStopFrame (AudioFilePlayer *afp, int frame)
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{
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    SInt64 position  = frame * 2352;
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    afp->mAudioFileManager->SetEndOfFile (afp->mAudioFileManager, position);
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}
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void delete_AudioFilePlayer(AudioFilePlayer *afp)
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{
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    if (afp != NULL)
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    {
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        afp->Disconnect(afp);
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        if (afp->mAudioFileManager) {
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            delete_AudioFileManager(afp->mAudioFileManager);
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            afp->mAudioFileManager = 0;
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        }
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        if (afp->mForkRefNum) {
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            FSClose (afp->mForkRefNum);
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            afp->mForkRefNum = 0;
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        }
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        SDL_free(afp);
1143
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    }
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}
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static int    AudioFilePlayer_Connect(AudioFilePlayer *afp)
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{
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#if DEBUG
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    printf ("Connect:%x, engaged=%d\n", (int)afp->mPlayUnit, (afp->mConnected ? 1 : 0));
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#endif
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    if (!afp->mConnected)
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    {           
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        if (!afp->mAudioFileManager->DoConnect(afp->mAudioFileManager))
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            return 0;
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        // set the render callback for the file data to be supplied to the sound converter AU
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        afp->mInputCallback.inputProc = afp->mAudioFileManager->FileInputProc;
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        afp->mInputCallback.inputProcRefCon = afp->mAudioFileManager;
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        OSStatus result = AudioUnitSetProperty (afp->mPlayUnit, 
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                            kAudioUnitProperty_SetInputCallback, 
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                            kAudioUnitScope_Input, 
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                            0,
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                            &afp->mInputCallback, 
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                            sizeof(afp->mInputCallback));
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        if (result) return 0;  //THROW_RESULT("AudioUnitSetProperty")
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        afp->mConnected = 1;
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    }
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    return 1;
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}
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// warning noted, now please go away ;-)
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// #warning This should redirect the calling of notification code to some other thread
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static void    AudioFilePlayer_DoNotification (AudioFilePlayer *afp, OSStatus inStatus)
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{
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    if (afp->mNotifier) {
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        (*afp->mNotifier) (afp->mRefCon, inStatus);
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    } else {
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        SDL_SetError ("Notification posted with no notifier in place");
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        if (inStatus == kAudioFilePlay_FileIsFinished)
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            afp->Disconnect(afp);
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        else if (inStatus != kAudioFilePlayErr_FilePlayUnderrun)
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            afp->Disconnect(afp);
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    }
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}
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static void    AudioFilePlayer_Disconnect (AudioFilePlayer *afp)
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{
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#if DEBUG
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    printf ("Disconnect:%x,%ld, engaged=%d\n", (int)afp->mPlayUnit, 0, (afp->mConnected ? 1 : 0));
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#endif
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    if (afp->mConnected)
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    {
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        afp->mConnected = 0;
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        afp->mInputCallback.inputProc = 0;
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        afp->mInputCallback.inputProcRefCon = 0;
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        OSStatus result = AudioUnitSetProperty (afp->mPlayUnit, 
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                                        kAudioUnitProperty_SetInputCallback, 
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                                        kAudioUnitScope_Input, 
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                                        0,
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                                        &afp->mInputCallback, 
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                                        sizeof(afp->mInputCallback));
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        if (result) 
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            SDL_SetError ("AudioUnitSetProperty:RemoveInputCallback:%ld", result);
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        afp->mAudioFileManager->Disconnect(afp->mAudioFileManager);
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    }
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}
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typedef struct {
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    UInt32 offset;
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    UInt32 blockSize;
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} SSNDData;
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static int    AudioFilePlayer_OpenFile (AudioFilePlayer *afp, const FSRef *inRef, SInt64 *outFileDataSize)
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{
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    ContainerChunk chunkHeader;
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    ChunkHeader chunk;
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    SSNDData ssndData;
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   239
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    OSErr result;
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    HFSUniStr255 dfName;
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    ByteCount actual;
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    SInt64 offset;
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    // Open the data fork of the input file
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    result = FSGetDataForkName(&dfName);
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       if (result) return 0; //THROW_RESULT("AudioFilePlayer::OpenFile(): FSGetDataForkName")
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    result = FSOpenFork(inRef, dfName.length, dfName.unicode, fsRdPerm, &afp->mForkRefNum);
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       if (result) return 0; //THROW_RESULT("AudioFilePlayer::OpenFile(): FSOpenFork")
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    // Read the file header, and check if it's indeed an AIFC file
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    result = FSReadFork(afp->mForkRefNum, fsAtMark, 0, sizeof(chunkHeader), &chunkHeader, &actual);
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       if (result) return 0; //THROW_RESULT("AudioFilePlayer::OpenFile(): FSReadFork")
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    if (chunkHeader.ckID != 'FORM') {
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        result = -1;
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        if (result) return 0; //THROW_RESULT("AudioFilePlayer::OpenFile(): chunk id is not 'FORM'");
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    }
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    if (chunkHeader.formType != 'AIFC') {
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        result = -1;
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        if (result) return 0; //THROW_RESULT("AudioFilePlayer::OpenFile(): file format is not 'AIFC'");
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    }
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    // Search for the SSND chunk. We ignore all compression etc. information
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    // in other chunks. Of course that is kind of evil, but for now we are lazy
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    // and rely on the cdfs to always give us the same fixed format.
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    // TODO: Parse the COMM chunk we currently skip to fill in mFileDescription.
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    offset = 0;
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    do {
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        result = FSReadFork(afp->mForkRefNum, fsFromMark, offset, sizeof(chunk), &chunk, &actual);
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           if (result) return 0; //THROW_RESULT("AudioFilePlayer::OpenFile(): FSReadFork")
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        // Skip the chunk data
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        offset = chunk.ckSize;
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    } while (chunk.ckID != 'SSND');
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    // Read the header of the SSND chunk. After this, we are positioned right
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    // at the start of the audio data.
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    result = FSReadFork(afp->mForkRefNum, fsAtMark, 0, sizeof(ssndData), &ssndData, &actual);
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       if (result) return 0; //THROW_RESULT("AudioFilePlayer::OpenFile(): FSReadFork")
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    result = FSSetForkPosition(afp->mForkRefNum, fsFromMark, ssndData.offset);
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       if (result) return 0; //THROW_RESULT("AudioFilePlayer::OpenFile(): FSSetForkPosition")
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    // Data size
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    *outFileDataSize = chunk.ckSize - ssndData.offset - 8;
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    // File format
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    afp->mFileDescription.mSampleRate = 44100;
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    afp->mFileDescription.mFormatID = kAudioFormatLinearPCM;
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    afp->mFileDescription.mFormatFlags = kLinearPCMFormatFlagIsPacked | kLinearPCMFormatFlagIsSignedInteger;
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    afp->mFileDescription.mBytesPerPacket = 4;
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    afp->mFileDescription.mFramesPerPacket = 1;
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    afp->mFileDescription.mBytesPerFrame = 4;
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    afp->mFileDescription.mChannelsPerFrame = 2;
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    afp->mFileDescription.mBitsPerChannel = 16;
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    return 1;
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}
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AudioFilePlayer *new_AudioFilePlayer (const FSRef *inFileRef)
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{
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    SInt64 fileDataSize  = 0;
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    AudioFilePlayer *afp = (AudioFilePlayer *) SDL_malloc(sizeof (AudioFilePlayer));
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    if (afp == NULL)
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        return NULL;
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    SDL_memset(afp, '\0', sizeof (*afp));
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    #define SET_AUDIOFILEPLAYER_METHOD(m) afp->m = AudioFilePlayer_##m
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    SET_AUDIOFILEPLAYER_METHOD(SetDestination);
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    SET_AUDIOFILEPLAYER_METHOD(SetNotifier);
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    SET_AUDIOFILEPLAYER_METHOD(SetStartFrame);
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    SET_AUDIOFILEPLAYER_METHOD(GetCurrentFrame);
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    SET_AUDIOFILEPLAYER_METHOD(SetStopFrame);
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    SET_AUDIOFILEPLAYER_METHOD(Connect);
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    SET_AUDIOFILEPLAYER_METHOD(Disconnect);
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    SET_AUDIOFILEPLAYER_METHOD(DoNotification);
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    SET_AUDIOFILEPLAYER_METHOD(IsConnected);
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    SET_AUDIOFILEPLAYER_METHOD(GetDestUnit);
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    SET_AUDIOFILEPLAYER_METHOD(Print);
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    SET_AUDIOFILEPLAYER_METHOD(OpenFile);
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    #undef SET_AUDIOFILEPLAYER_METHOD
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    if (!afp->OpenFile (afp, inFileRef, &fileDataSize))
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    {
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        SDL_free(afp);
1143
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        return NULL;
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    }
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    // we want about 4 seconds worth of data for the buffer
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    int bytesPerSecond = (UInt32) (4 * afp->mFileDescription.mSampleRate * afp->mFileDescription.mBytesPerFrame);
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#if DEBUG
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    printf("File format:\n");
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    PrintStreamDesc (&afp->mFileDescription);
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#endif
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    afp->mAudioFileManager = new_AudioFileManager(afp, afp->mForkRefNum,
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                                                  fileDataSize,
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                                                  bytesPerSecond);
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    if (afp->mAudioFileManager == NULL)
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    {
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        delete_AudioFilePlayer(afp);
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        return NULL;
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    }
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    return afp;
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}
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