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<pre class="sourcecodebox">/*
* File: main.c
*
* Contains: Demonstrates how to play an audio file using the Default Output Audio Unit
*
* Version: 1.1
*
* Created: 2004-01-23
*
* Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc. ("Apple") in
* consideration of your agreement to the following terms, and your use, installation, modification
* or redistribution of this Apple software constitutes acceptance of these terms. If you do
* not agree with these terms, please do not use, install, modify or redistribute this Apple
* software.
*
* In consideration of your agreement to abide by the following terms, and subject to these terms,
* Apple grants you a personal, non-exclusive license, under Apple's copyrights in this
* original Apple software (the "Apple Software"), to use, reproduce, modify and redistribute the
* Apple Software, with or without modifications, in source and/or binary forms; provided that if you
* redistribute the Apple Software in its entirety and without modifications, you must retain this
* notice and the following text and disclaimers in all such redistributions of the Apple Software.
* Neither the name, trademarks, service marks or logos of Apple Computer, Inc. may be used to
* endorse or promote products derived from the Apple Software without specific prior written
* permission from Apple. Except as expressly stated in this notice, no other rights or
* licenses, express or implied, are granted by Apple herein, including but not limited to any
* patent rights that may be infringed by your derivative works or by other works in which the
* Apple Software may be incorporated.
*
* The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO WARRANTIES, EXPRESS OR
* IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE
* OR IN COMBINATION WITH YOUR PRODUCTS.
*
* IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE,
* REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER
* UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN
* IF APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <CoreServices/CoreServices.h>
#include <AudioUnit/AudioUnit.h>
#include <AudioToolbox/AudioToolbox.h>
#include <unistd.h> //for usleep
AudioConverterRef converter;
void *gSourceBuffer;
AudioFileID *gSourceAudioFileID;
UInt64 gTotalPacketCount=0;
UInt64 gFileByteCount =0;
UInt32 gMaxPacketSize =0;
UInt64 gPacketOffset=0;
Boolean gIsPlaying = FALSE;
#define checkStatus( err) \
if(err) {\
printf("Error: %s -> %s: %d\n", (char *)&err,__FILE__, __LINE__);\
fflush(stdout);\
return err; \
}
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");
}
OSStatus setupAudioUnit(AudioUnit *theOutputUnit){
OSStatus err;
//An Audio Unit is a OS component
//The component description must be setup, then used to
//initialize an AudioUnit
ComponentDescription desc;
desc.componentType = kAudioUnitType_Output;
desc.componentSubType = kAudioUnitSubType_DefaultOutput;
desc.componentManufacturer = kAudioUnitManufacturer_Apple;
desc.componentFlags = 0;
desc.componentFlagsMask = 0;
Component comp = FindNextComponent(NULL, &desc); //Finds an component that meets the desc spec's
if (comp == NULL) exit (-1);
err = OpenAComponent(comp, theOutputUnit); //gains access to the services provided by the component
if (err) exit (-1);
// Initialize AudioUnit
verify_noerr(AudioUnitInitialize(*theOutputUnit));
return err;
}
OSStatus MatchAUFormats (AudioUnit *theUnit,AudioStreamBasicDescription *theDesc ,UInt32 theInputBus)
{
UInt32 size = sizeof (AudioStreamBasicDescription);
memset(theDesc, 0, size);
Boolean outWritable;
//Gets the size of the Stream Format Property and if it is writable
AudioUnitGetPropertyInfo(*theUnit,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Output,
0,
&size,
&outWritable);
//Get the current stream format of the output
OSStatus result = AudioUnitGetProperty (*theUnit,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Output,
0,
theDesc,
&size);
checkStatus(result);
//Set the stream format of the output to match the input
result = AudioUnitSetProperty (*theUnit,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input,
theInputBus,
theDesc,
size);
return result;
}
OSStatus MakeAUConverter( AudioFileID *musicFileID,AudioConverterRef *conv,AudioStreamBasicDescription *inASBD, AudioStreamBasicDescription *outASBD){
OSStatus err;
//To Do: Add some error checking to make sure the formats are valid
err = AudioConverterNew( inASBD,outASBD , conv);
checkStatus(err);
//Get Magic Cookie info(if exists) and pass it to converter
//Not all files have magic cooke information so this step might
//not be necessary depending on your audio file type (AIFF, MP3, etc.)
UInt32 magicCookieSize = 0;
err = AudioFileGetPropertyInfo( *musicFileID,
kAudioFilePropertyMagicCookieData,
&magicCookieSize,
NULL);
if (err == noErr)
{
void *magicCookie = calloc (1, magicCookieSize);
if (magicCookie)
{
//Get Magic Cookie data from Audio File
err = AudioFileGetProperty ( *musicFileID,
kAudioFilePropertyMagicCookieData,
&magicCookieSize,
magicCookie);
// Give the AudioConverter the magic cookie decompression params if there are any
if (err == noErr)
{
err = AudioConverterSetProperty( *conv,
kAudioConverterDecompressionMagicCookie,
magicCookieSize,
magicCookie);
}
err = noErr;
if (magicCookie) free(magicCookie);
}
}else //this is OK because some audio data doesn't need magic cookie data
err = noErr;
return err;
}
OSStatus getFileInfo(FSRef *fileRef, AudioFileID *fileID, AudioStreamBasicDescription *fileASBD, const char *fileName){
OSStatus err= noErr;
UInt32 size;
FSPathMakeRef ((const UInt8 *)fileName, fileRef, 0); //Obtain filesystem reference to the file
err = AudioFileOpen(fileRef, fsRdPerm,0,fileID); //Obtain AudioFileID
gSourceAudioFileID = fileID; //gloabal pointer to AudioFileID
size = sizeof(AudioStreamBasicDescription);
memset(fileASBD, 0, size);
//Fetch the AudioStreamBasicDescription of the audio file.
err = AudioFileGetProperty(*fileID, kAudioFilePropertyDataFormat, &size, fileASBD);
checkStatus(err);
printf("File format is:\n");
PrintStreamDesc(fileASBD);
//Get total packet count, byte count, and max packet size
//Theses values will be used later when grabbing data from the audio file
size = sizeof(gTotalPacketCount);
err = AudioFileGetProperty(*fileID, kAudioFilePropertyAudioDataPacketCount, &size, &gTotalPacketCount);
checkStatus(err);
size = sizeof(gFileByteCount);
err = AudioFileGetProperty(*fileID, kAudioFilePropertyAudioDataByteCount, &size, &gFileByteCount);
checkStatus(err);
size = sizeof(gMaxPacketSize);
err = AudioFileGetProperty(*fileID, kAudioFilePropertyMaximumPacketSize, &size, &gMaxPacketSize);
checkStatus(err);
return err;
}
OSStatus ACComplexInputProc ( AudioConverterRef inAudioConverter,
UInt32 *ioNumberDataPackets,
AudioBufferList *ioData,
AudioStreamPacketDescription **outDataPacketDescription,
void* inUserData)
{
OSStatus err = noErr;
//appGlobalsPtr globals = (appGlobalsPtr) inUserData;
UInt32 bytesReturned = 0;
// initialize in case of failure
ioData->mBuffers[0].mData = NULL;
ioData->mBuffers[0].mDataByteSize = 0;
// if there are not enough packets to satisfy request, then read what's left
if (gPacketOffset + *ioNumberDataPackets > gTotalPacketCount)
*ioNumberDataPackets = gTotalPacketCount - gPacketOffset;
// do nothing if there are no packets available
if (*ioNumberDataPackets)
{
if (gSourceBuffer != NULL) {
free(gSourceBuffer);
gSourceBuffer = NULL;
}
gSourceBuffer = (void *) calloc (1, *ioNumberDataPackets * gMaxPacketSize);
//read the amount of data needed(ioNumberDataPackets) from AudioFile
err = AudioFileReadPackets (*gSourceAudioFileID, false, &bytesReturned, NULL, gPacketOffset,
ioNumberDataPackets, gSourceBuffer);
if(err){
checkStatus(err);
gIsPlaying =FALSE; //end of data reached;
}
gPacketOffset += *ioNumberDataPackets; // keep track of where we want to read from next time
ioData->mBuffers[0].mData = gSourceBuffer; // tell the Audio Converter where it's source data is
ioData->mBuffers[0].mDataByteSize = bytesReturned; // tell the Audio Converter how much source data there is
}
else
{
// there aren't any more packets to read at this time
ioData->mBuffers[0].mData = NULL;
ioData->mBuffers[0].mDataByteSize = 0;
gIsPlaying=FALSE;
}
// it's not an error if we just read the remainder of the file
if (err == eofErr && *ioNumberDataPackets)
err = noErr;
return err;
}
OSStatus fileRenderProc(void *inRefCon,
AudioUnitRenderActionFlags *inActionFlags,
const AudioTimeStamp *inTimeStamp,
UInt32 inBusNumber,
UInt32 inNumFrames,
AudioBufferList *ioData)
{
OSStatus err= noErr;
void *inInputDataProcUserData=NULL;
AudioStreamPacketDescription* outPacketDescription =NULL;
err = AudioConverterFillComplexBuffer(converter, ACComplexInputProc ,inInputDataProcUserData , &inNumFrames, ioData, outPacketDescription);
/*Parameters for AudioConverterFillComplexBuffer()
converter - the converter being used
ACComplexInputProc() - input procedure to supply data to the Audio Converter
inInputDataProcUserData - Used to hold any data that needs to be passed on. Not needed in this example.
inNumFrames - The amount of requested data. On output, this
number is the amount actually received.
ioData - Buffer of the converted data recieved on return
outPacketDescription - contains the format of the returned data. Not used in this example.
*/
checkStatus(err);
return err;
}
OSStatus setupCallbacks(AudioUnit *theOutputUnit, AURenderCallbackStruct *renderCallback){
OSStatus err= noErr;
memset(renderCallback, 0, sizeof(AURenderCallbackStruct));
renderCallback->inputProc = fileRenderProc;
renderCallback->inputProcRefCon =0;
//Sets the callback for the Audio Unit
err = AudioUnitSetProperty (*theOutputUnit,
kAudioUnitProperty_SetRenderCallback,
kAudioUnitScope_Input,
0,
renderCallback,
sizeof(AURenderCallbackStruct));
checkStatus(err);
return err;
}
void CleanUp(AudioUnit *theOutputUnit,AudioFileID *fileID){
printf("finished playing\n");
//Cleaning anything allocated.
AudioFileClose(*fileID);
if (gSourceBuffer != NULL) {
free(gSourceBuffer);
gSourceBuffer = NULL;
}
AudioConverterDispose(converter);
AudioOutputUnitStop(*theOutputUnit);//you must stop the audio unit
AudioUnitUninitialize (*theOutputUnit);
CloseComponent(*theOutputUnit);
}
int main (int argc, const char * argv[]) {
AudioUnit theOutputUnit;
AURenderCallbackStruct renderCallback;
OSStatus err = noErr;
AudioStreamBasicDescription fileASBD, outputASBD;
AudioFileID musicFileID;
FSRef fileRef;
char *fileName ="/System/Library/Sounds/Submarine.aiff"; //give full path of any properly formatted audio file
if(argc == 2)
fileName = (char *)argv[1];
err = setupAudioUnit(&theOutputUnit);
checkStatus(err);
err = MatchAUFormats(&theOutputUnit,&outputASBD, 0); //"0" is the output bus, use "1" for the input bus
checkStatus(err);
err = getFileInfo(&fileRef, &musicFileID, &fileASBD, fileName);
checkStatus(err);
err = MakeAUConverter(&musicFileID, &converter,&fileASBD, &outputASBD );
checkStatus(err);
err = setupCallbacks(&theOutputUnit, &renderCallback);
checkStatus(err);
printf("\n\nOutput format of Audio is:\n");
PrintStreamDesc(&outputASBD);
err =AudioOutputUnitStart(theOutputUnit);
checkStatus(err);
printf("\n\nPlay has started\n");
gIsPlaying=TRUE;
while (gIsPlaying) {
usleep (250000); //check every 1/4 of a second to see if audio is done playing
}
CleanUp(&theOutputUnit, &musicFileID);
return 0;
}
</pre>
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