cog/Sound/SoundFile/CoreAudioFile.m

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2006-05-07 13:19:23 +00:00
/*
* $Id$
*
* Copyright (C) 2006 Stephen F. Booth <me@sbooth.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#import "CoreAudioFile.h"
@interface CoreAudioFile (Private)
- (BOOL) readInfoFromExtAudioFileRef:(ExtAudioFileRef)file;
@end
@implementation CoreAudioFile
- (BOOL) open:(const char *)filename
{
OSStatus err;
FSRef ref;
// Open the input file
err = FSPathMakeRef((const UInt8 *)filename, &ref, NULL);
if(noErr != err) {
NSLog(@"Error opening ExtAudioFile: %i", err);
return NO;
}
err = ExtAudioFileOpen(&ref, &_in);
if(noErr != err) {
NSLog(@"Error opening ExtAudioFile: %i", err);
return NO;
}
// Read properties
return [self readInfoFromExtAudioFileRef:_in];
}
- (void) close
{
OSStatus err;
err = ExtAudioFileDispose(_in);
if(noErr != err) {
NSLog(@"Error closing ExtAudioFile: %i", err);
}
}
- (BOOL) readInfo:(const char *)filename
{
OSStatus err;
FSRef ref;
BOOL result;
result = YES;
// Open the input file
err = FSPathMakeRef((const UInt8 *)filename, &ref, NULL);
if(noErr != err) {
NSLog(@"Error closing ExtAudioFile: %i", err);
return NO;
}
err = ExtAudioFileOpen(&ref, &_in);
if(noErr != err) {
NSLog(@"Error closing ExtAudioFile: %i", err);
return NO;
}
result = [self readInfoFromExtAudioFileRef:_in];
return result;
}
- (BOOL) readInfoFromExtAudioFileRef:(ExtAudioFileRef)file
{
OSStatus err;
UInt32 size;
SInt64 totalFrames;
AudioStreamBasicDescription asbd;
// Get input file information
size = sizeof(asbd);
err = ExtAudioFileGetProperty(file, kExtAudioFileProperty_FileDataFormat, &size, &asbd);
if(err != noErr) {
err = ExtAudioFileDispose(file);
NSLog(@"Error closing ExtAudioFile: %i", err);
return NO;
}
size = sizeof(totalFrames);
err = ExtAudioFileGetProperty(file, kExtAudioFileProperty_FileLengthFrames, &size, &totalFrames);
if(err != noErr) {
err = ExtAudioFileDispose(file);
NSLog(@"Error closing ExtAudioFile: %i", err);
return NO;
}
// Set our properties
bitsPerSample = asbd.mBitsPerChannel;
channels = asbd.mChannelsPerFrame;
frequency = asbd.mSampleRate;
// mBitsPerChannel will only be set for lpcm formats
if(0 == bitsPerSample) {
bitsPerSample = 16;
}
totalSize = totalFrames * channels * (bitsPerSample / 8);
currentPosition = 0;
bitRate = 0;
// Set output format
AudioStreamBasicDescription result;
bzero(&result, sizeof(AudioStreamBasicDescription));
result.mFormatID = kAudioFormatLinearPCM;
result.mFormatFlags = kAudioFormatFlagIsSignedInteger | kLinearPCMFormatFlagIsBigEndian;
result.mSampleRate = frequency;
result.mChannelsPerFrame = channels;
result.mBitsPerChannel = bitsPerSample;
result.mBytesPerPacket = channels * (bitsPerSample / 8);
result.mFramesPerPacket = 1;
result.mBytesPerFrame = channels * (bitsPerSample / 8);
err = ExtAudioFileSetProperty(file, kExtAudioFileProperty_ClientDataFormat, sizeof(result), &result);
if(noErr != err) {
err = ExtAudioFileDispose(file);
NSLog(@"Error closing ExtAudioFile: %i", err);
return NO;
}
// Further properties
isBigEndian = YES;
isUnsigned = NO;
NSLog(@"Successfully read file");
return YES;
}
- (int) fillBuffer:(void *)buf ofSize:(UInt32)size
{
OSStatus err;
AudioBufferList bufferList;
UInt32 frameCount;
// Set up the AudioBufferList
bufferList.mNumberBuffers = 1;
bufferList.mBuffers[0].mNumberChannels = channels;
bufferList.mBuffers[0].mData = buf;
bufferList.mBuffers[0].mDataByteSize = size;
// Read a chunk of PCM input (converted from whatever format)
frameCount = (size / (channels * (bitsPerSample / 8)));
err = ExtAudioFileRead(_in, &frameCount, &bufferList);
if(err != noErr) {
NSLog(@"Error reading ExtAudioFile: %i", err);
return 0;
}
return frameCount * (channels * (bitsPerSample / 8));
}
- (double) seekToTime:(double)milliseconds
{
OSStatus err;
err = ExtAudioFileSeek(_in, ((milliseconds / 1000.f) * frequency));
if(noErr != err) {
return -1.f;
}
return milliseconds;
}
@end