169 lines
3.1 KiB
Objective-C
169 lines
3.1 KiB
Objective-C
//
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// OpusDecoder.m
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// Opus
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//
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// Created by Christopher Snowhill on 10/4/13.
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// Copyright 2013 __NoWork, Inc__. All rights reserved.
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//
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#import "Plugin.h"
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#import "OpusDecoder.h"
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#import "Logging.h"
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@implementation OpusFile
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int sourceRead(void *_stream, unsigned char *_ptr, int _nbytes)
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{
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id source = (__bridge id)_stream;
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return (int) [source read:_ptr amount:_nbytes];
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}
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int sourceSeek(void *_stream, opus_int64 _offset, int _whence)
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{
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id source = (__bridge id)_stream;
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return ([source seek:_offset whence:_whence] ? 0 : -1);
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}
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int sourceClose(void *_stream)
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{
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return 0;
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}
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opus_int64 sourceTell(void *_stream)
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{
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id source = (__bridge id)_stream;
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return [source tell];
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}
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- (id)init
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{
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self = [super init];
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if (self)
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{
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opusRef = NULL;
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}
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return self;
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}
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- (BOOL)open:(id<CogSource>)s
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{
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source = s;
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OpusFileCallbacks callbacks = {
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.read = sourceRead,
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.seek = sourceSeek,
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.close = sourceClose,
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.tell = sourceTell
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};
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int error;
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opusRef = op_open_callbacks((__bridge void *)source, &callbacks, NULL, 0, &error);
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if (!opusRef)
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{
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DLog(@"FAILED TO OPEN OPUS FILE");
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return NO;
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}
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currentSection = lastSection = op_current_link( opusRef );
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bitrate = (op_bitrate(opusRef, currentSection )/1000.0);
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channels = op_channel_count( opusRef, currentSection );
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seekable = op_seekable(opusRef);
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totalFrames = op_pcm_total(opusRef, -1);
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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)readAudio:(void *)buf frames:(UInt32)frames
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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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bitrate = (op_bitrate(opusRef, currentSection)/1000.0);
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channels = op_channel_count(opusRef, currentSection);
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[self willChangeValueForKey:@"properties"];
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[self didChangeValueForKey:@"properties"];
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}
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int size = frames * channels;
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do {
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lastSection = currentSection;
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numread = op_read_float( opusRef, &((float *)buf)[total], size - total, NULL );
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currentSection = op_current_link( opusRef );
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if (numread > 0) {
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total += numread * channels;
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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 != frames && numread != 0);
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return total/channels;
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}
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- (void)close
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{
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op_free(opusRef);
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opusRef = NULL;
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}
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- (void)dealloc
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{
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[self close];
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}
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- (long)seek:(long)frame
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{
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op_pcm_seek(opusRef, frame);
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return frame;
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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:32], @"bitsPerSample",
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[NSNumber numberWithBool:YES], @"floatingPoint",
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[NSNumber numberWithFloat:48000], @"sampleRate",
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[NSNumber numberWithDouble:totalFrames], @"totalFrames",
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[NSNumber numberWithInt:bitrate], @"bitrate",
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[NSNumber numberWithBool:([source seekable] && seekable)], @"seekable",
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@"Opus", @"codec",
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@"host", @"endian",
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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:@"opus",@"ogg",nil];
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}
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+ (NSArray *)mimeTypes
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{
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return [NSArray arrayWithObjects:@"audio/x-opus+ogg", nil];
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}
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+ (float)priority
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{
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return 1.0;
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}
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@end
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