cog/Plugins/Vorbis/VorbisDecoder.m

153 lines
3.0 KiB
Objective-C

//
// VorbisFile.m
// zyVorbis
//
// Created by Vincent Spader on 1/22/05.
// Copyright 2005 Vincent Spader All rights reserved.
//
#import "VorbisDecoder.h"
@implementation VorbisDecoder
size_t sourceRead(void *buf, size_t size, size_t nmemb, void *datasource)
{
id source = (id)datasource;
return [source read:buf amount:(size*nmemb)];
}
int sourceSeek(void *datasource, ogg_int64_t offset, int whence)
{
id source = (id)datasource;
return ([source seek:offset whence:whence] ? 0 : -1);
}
int sourceClose(void *datasource)
{
id source = (id)datasource;
[source close];
return 0;
}
long sourceTell(void *datasource)
{
id source = (id)datasource;
return [source tell];
}
- (BOOL)open:(id<CogSource>)s
{
source = [s retain];
ov_callbacks callbacks = {
.read_func = sourceRead,
.seek_func = sourceSeek,
.close_func = sourceClose,
.tell_func = sourceTell
};
if (ov_open_callbacks(source, &vorbisRef, NULL, 0, callbacks) != 0)
{
NSLog(@"FAILED TO OPEN VORBIS FILE");
return NO;
}
vorbis_info *vi;
vi = ov_info(&vorbisRef, -1);
bitsPerSample = vi->channels * 8;
bitrate = (vi->bitrate_nominal/1000.0);
channels = vi->channels;
frequency = vi->rate;
seekable = ov_seekable(&vorbisRef);
totalFrames = ov_pcm_total(&vorbisRef, -1);
[self willChangeValueForKey:@"properties"];
[self didChangeValueForKey:@"properties"];
return YES;
}
- (int)readAudio:(void *)buf frames:(UInt32)frames
{
int numread;
int total = 0;
if (currentSection != lastSection) {
vorbis_info *vi;
vi = ov_info(&vorbisRef, -1);
bitsPerSample = vi->channels * 8;
bitrate = (vi->bitrate_nominal/1000.0);
channels = vi->channels;
frequency = vi->rate;
[self willChangeValueForKey:@"properties"];
[self didChangeValueForKey:@"properties"];
}
int size = frames * channels * (bitsPerSample/8);
do {
lastSection = currentSection;
numread = ov_read(&vorbisRef, &((char *)buf)[total], size - total, 0, bitsPerSample/8, 1, &currentSection);
if (numread > 0) {
total += numread;
}
if (currentSection != lastSection) {
break;
}
} while (total != size && numread != 0);
return total/(channels * (bitsPerSample/8));
}
- (void)close
{
ov_clear(&vorbisRef);
[source close];
[source release];
}
- (long)seek:(long)frame
{
ov_pcm_seek(&vorbisRef, frame);
return frame;
}
- (NSDictionary *)properties
{
return [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:channels], @"channels",
[NSNumber numberWithInt:bitsPerSample], @"bitsPerSample",
[NSNumber numberWithFloat:frequency], @"sampleRate",
[NSNumber numberWithDouble:totalFrames], @"totalFrames",
[NSNumber numberWithInt:bitrate], @"bitrate",
[NSNumber numberWithBool:([source seekable] && seekable)], @"seekable",
nil];
}
+ (NSArray *)fileTypes
{
return [NSArray arrayWithObjects:@"ogg",nil];
}
+ (NSArray *)mimeTypes
{
return [NSArray arrayWithObjects:@"application/ogg", @"application/x-ogg", @"audio/x-vorbis+ogg", nil];
}
@end