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