//
// SessionExporter.m
// Meditation Timer
//
// Created by William Henderson on 2/24/06.
// Free for any kind of peaceful use.
//
#import "SessionExporter.h"
@implementation SessionExporter
- (BOOL)exportSession
{
//First we need to generate the audio.
QTMovie * theSession; //we'll just set it to the end chime first and then insert in front of it thereafter
NSString *theChime = [[NSUserDefaults standardUserDefaults] stringForKey:@"endChime"];
NSString *fileName = [[NSBundle mainBundle] pathForResource:theChime ofType:@""]; //find the chime in the bundle
theSession = [[QTMovie alloc] initWithFile:fileName error:nil]; //initialize the movie with it
[theSession setAttribute:[NSNumber numberWithBool:YES] forKey:@"QTMovieEditableAttribute"]; //and make sure its editable!
int lengthBetweenStartAndNextBell = 0;//this will hold the period of time between the start and either the first period bell or the end bell (if there are no periods)
//now work backwards through the session, inserting periods (if they exist) and period chimes until the session length has elapsed
if([[NSUserDefaults standardUserDefaults] boolForKey:@"hasPeriodChime"]) {
//load the period chime
QTMovie *periodChime;
theChime = [[NSUserDefaults standardUserDefaults] stringForKey:@"periodChime"];
fileName = [[NSBundle mainBundle] pathForResource:theChime ofType:@""]; //find the chime in the bundle
periodChime = [[QTMovie alloc] initWithFile:fileName error:nil]; //initialize the movie with it
int sessionLength = [[NSUserDefaults standardUserDefaults] integerForKey:@"endTime"]; //in MINUTES
int periodLength = [[NSUserDefaults standardUserDefaults] integerForKey:@"periodTime"]; //in MINUTES
int periodsInserted = 0;
if(sessionLength % periodLength > 1) { //that is, if we've got at least 1 extra minute on top of the evenly divided periods, then we should take care of that first
//insert the silence
// \/convert from minutes to 1/600th seconds
long finalPdLength = ((sessionLength % periodLength)* 36000) - [periodChime duration].timeValue; //this remainder period will last the remainder - the length of the chime periodChime before it.
QTTime insertionPoint = QTMakeTime(0,600); //the scale is 600 as in 600 whatevers per second
QTTime durationTime = QTMakeTime(finalPdLength,600); //how long the silence goes
QTTimeRange theRange = QTMakeTimeRange(insertionPoint,durationTime);
[theSession insertEmptySegmentAt:theRange];
//insert the chime
durationTime = [periodChime duration];
theRange = QTMakeTimeRange(insertionPoint,durationTime); //using the same insertion point
[theSession insertSegmentOfMovie:periodChime timeRange:theRange atTime:insertionPoint];
periodsInserted++;
}
while((periodsInserted + 1) * periodLength < sessionLength) { //we only want to go to the 2cnd period and insert the chime for the first, since there are n+1 periods and n chimes.
//insert a silence period of periodLength - [chime duration]
long pdLength = (periodLength * 36000) - [periodChime duration].timeValue;
QTTime insertionPoint = QTMakeTime(0,600);
QTTime durationTime = QTMakeTime(pdLength,600); //how long the silence goes
QTTimeRange theRange = QTMakeTimeRange(insertionPoint,durationTime);
[theSession insertEmptySegmentAt:theRange];
//insert the chime
durationTime = [periodChime duration];
theRange = QTMakeTimeRange(insertionPoint,durationTime); //using the same insertion point
[theSession insertSegmentOfMovie:periodChime timeRange:theRange atTime:insertionPoint];
periodsInserted++;
}
lengthBetweenStartAndNextBell = periodLength; //this will get that n+1'th period
}
else {//if there's no periodChimes (ie n=0), just make lengthBetweenStartChimeAndNextBell = the sessionLength
lengthBetweenStartAndNextBell = [[NSUserDefaults standardUserDefaults] integerForKey:@"endTime"];
}
//finally, insert the startChime and delay if they exists
if([[NSUserDefaults standardUserDefaults] boolForKey:@"hasStartChime"]) {
//load the start chime
QTMovie *startChime;
theChime = [[NSUserDefaults standardUserDefaults] stringForKey:@"startChime"];
fileName = [[NSBundle mainBundle] pathForResource:theChime ofType:@""]; //find the chime in the bundle
startChime = [[QTMovie alloc] initWithFile:fileName error:nil]; //initialize the movie with it
int delayLength = [[NSUserDefaults standardUserDefaults] integerForKey:@"startTime"]; //in MINUTES
//first, insert the first (if any) period
long pdLength = (lengthBetweenStartAndNextBell * 36000) - [startChime duration].timeValue;
QTTime insertionPoint = QTMakeTime(0,600);
QTTime durationTime = QTMakeTime(pdLength,600); //how long the silence goes
QTTimeRange theRange = QTMakeTimeRange(insertionPoint,durationTime);
[theSession insertEmptySegmentAt:theRange];
//now insert the chime
durationTime = [startChime duration];
theRange = QTMakeTimeRange(insertionPoint,durationTime); //using the same insertion point
[theSession insertSegmentOfMovie:startChime timeRange:theRange atTime:insertionPoint];
//now insert the delay
long delayDuration = (delayLength *36000);
insertionPoint = QTMakeTime(0,600);
durationTime = QTMakeTime(delayDuration,600); //how long the silence goes
theRange = QTMakeTimeRange(insertionPoint,durationTime);
[theSession insertEmptySegmentAt:theRange];
}
else {//if no startTime, then we still need to insert lengthBetweenStartAndNextBell
long pdLength = lengthBetweenStartAndNextBell * 36000;
QTTime insertionPoint = QTMakeTime(0,600);
QTTime durationTime = QTMakeTime(pdLength,600); //how long the silence goes
QTTimeRange theRange = QTMakeTimeRange(insertionPoint,durationTime);
[theSession insertEmptySegmentAt:theRange];
}
//PHEW! now do the exporting
NSDictionary* theAttributes = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool: YES], QTMovieExport,
[NSNumber numberWithLong: kQTFileTypeMP4], QTMovieExportType, nil]; //here is our file export information
BOOL result = [theSession writeToFile:[NSHomeDirectory() stringByAppendingPathComponent:@"MeditationSession.m4a"]
withAttributes:theAttributes];
if(!result)
{
NSLog(@"Error writing session to audio file");
return NO;
}
return YES;
}
@end
) is private.
