cog/Plugins/CoreAudio/CoreAudioDecoder.m

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/*
* $Id$
*
* 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
*/
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#include <unistd.h>
#import "CoreAudioDecoder.h"
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@interface CoreAudioDecoder (Private)
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- (BOOL) readInfoFromExtAudioFileRef;
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@end
@implementation CoreAudioDecoder
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- (void) close
{
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OSStatus err;
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err = ExtAudioFileDispose(_in);
if(noErr != err) {
NSLog(@"Error closing ExtAudioFile");
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}
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}
- (BOOL)open:(id<CogSource>)source;
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{
OSStatus err;
FSRef ref;
NSURL *url = [source url];
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[source close]; //There's no room for your kind around here!
if (![[url scheme] isEqualToString:@"file"])
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return NO;
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// Open the input file
err = FSPathMakeRef((const UInt8 *)[[url path] UTF8String], &ref, NULL);
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if(noErr != err) {
return NO;
}
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err = ExtAudioFileOpen(&ref, &_in);
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if(noErr != err) {
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NSLog(@"Error opening file: %s", &err);
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return NO;
}
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return [self readInfoFromExtAudioFileRef];
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}
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- (BOOL) readInfoFromExtAudioFileRef
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{
OSStatus err;
UInt32 size;
AudioStreamBasicDescription asbd;
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// Get input file information
size = sizeof(asbd);
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err = ExtAudioFileGetProperty(_in, kExtAudioFileProperty_FileDataFormat, &size, &asbd);
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if(err != noErr) {
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err = ExtAudioFileDispose(_in);
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return NO;
}
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SInt64 total;
size = sizeof(total);
err = ExtAudioFileGetProperty(_in, kExtAudioFileProperty_FileLengthFrames, &size, &total);
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if(err != noErr) {
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err = ExtAudioFileDispose(_in);
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return NO;
}
totalFrames = total;
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//Is there a way to get bitrate with extAudioFile?
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bitrate = 0;
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// Set our properties
bitsPerSample = asbd.mBitsPerChannel;
channels = asbd.mChannelsPerFrame;
frequency = asbd.mSampleRate;
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// mBitsPerChannel will only be set for lpcm formats
if(0 == bitsPerSample) {
bitsPerSample = 16;
}
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// Set output format
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AudioStreamBasicDescription result;
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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);
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err = ExtAudioFileSetProperty(_in, kExtAudioFileProperty_ClientDataFormat, sizeof(result), &result);
if(noErr != err) {
err = ExtAudioFileDispose(_in);
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return NO;
}
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[self willChangeValueForKey:@"properties"];
[self didChangeValueForKey:@"properties"];
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return YES;
}
- (int) readAudio:(void *)buf frames:(UInt32)frames
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{
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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 = frames * channels * (bitsPerSample/8);
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// Read a chunk of PCM input (converted from whatever format)
frameCount = frames;
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err = ExtAudioFileRead(_in, &frameCount, &bufferList);
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if(err != noErr) {
return 0;
}
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return frameCount;
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}
- (long) seek:(long)frame
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{
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OSStatus err;
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err = ExtAudioFileSeek(_in, frame);
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if(noErr != err) {
return -1;
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}
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return frame;
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}
+ (NSArray *)fileTypes
{
OSStatus err;
UInt32 size;
NSArray *sAudioExtensions;
size = sizeof(sAudioExtensions);
err = AudioFileGetGlobalInfo(kAudioFileGlobalInfo_AllExtensions, 0, NULL, &size, &sAudioExtensions);
if(noErr != err) {
return nil;
}
return [sAudioExtensions autorelease];
}
+ (NSArray *)mimeTypes
{
return nil;
}
- (NSDictionary *)properties
{
return [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:channels],@"channels",
[NSNumber numberWithInt:bitsPerSample],@"bitsPerSample",
[NSNumber numberWithInt:bitrate],@"bitrate",
[NSNumber numberWithFloat:frequency],@"sampleRate",
[NSNumber numberWithLong:totalFrames],@"totalFrames",
[NSNumber numberWithBool:YES], @"seekable",
@"big", @"endian",
nil];
}
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@end