229 lines
4.6 KiB
Objective-C
229 lines
4.6 KiB
Objective-C
//
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// MusepackFile.m
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// zyVorbis
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//
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// Created by Vincent Spader on 1/23/05.
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// Copyright 2005 Vincent Spader All rights reserved.
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//
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#import "MusepackDecoder.h"
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#import "Logging.h"
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@implementation MusepackDecoder
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mpc_int32_t ReadProc(void *data, void *ptr, mpc_int32_t size)
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{
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MusepackDecoder *decoder = (MusepackDecoder *) data;
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return [[decoder source] read:ptr amount:size];
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}
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mpc_bool_t SeekProc(void *data, mpc_int32_t offset)
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{
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MusepackDecoder *decoder = (MusepackDecoder *) data;
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return [[decoder source] seek:offset whence:SEEK_SET];
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}
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mpc_int32_t TellProc(void *data)
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{
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MusepackDecoder *decoder = (MusepackDecoder *) data;
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return [[decoder source] tell];
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}
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mpc_int32_t GetSizeProc(void *data)
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{
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MusepackDecoder *decoder = (MusepackDecoder *) data;
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if ([[decoder source] seekable]) {
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long currentPos = [[decoder source] tell];
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[[decoder source] seek:0 whence:SEEK_END];
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long size = [[decoder source] tell];
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[[decoder source] seek:currentPos whence:SEEK_SET];
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return size;
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}
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else {
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return 0;
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}
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}
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mpc_bool_t CanSeekProc(void *data)
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{
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MusepackDecoder *decoder = (MusepackDecoder *) data;
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return [[decoder source] seekable];
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}
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- (BOOL)open:(id<CogSource>)s
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{
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[self setSource: s];
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reader.read = ReadProc;
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reader.seek = SeekProc;
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reader.tell = TellProc;
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reader.get_size = GetSizeProc;
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reader.canseek = CanSeekProc;
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reader.data = self;
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mpc_streaminfo_init(&info);
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if (mpc_streaminfo_read(&info, &reader) != ERROR_CODE_OK)
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{
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DLog(@"Not a valid musepack file.");
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return NO;
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}
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/* instantiate a decoder with our reader */
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mpc_decoder_setup(&decoder, &reader);
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if (!mpc_decoder_initialize(&decoder, &info))
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{
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DLog(@"Error initializing decoder.");
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return NO;
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}
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bitrate = (int)(info.average_bitrate/1000.0);
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frequency = info.sample_freq;
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totalFrames = mpc_streaminfo_get_length_samples(&info);
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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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- (BOOL)writeToBuffer:(float *)sample_buffer fromBuffer:(const MPC_SAMPLE_FORMAT *)p_buffer frames:(unsigned)frames
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{
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unsigned n;
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unsigned p_size = frames * 2; //2 = stereo
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#ifdef MPC_FIXED_POINT
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const float float_scale = 1.0 / MPC_FIXED_POINT_SCALE;
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#endif
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for (n = 0; n < p_size; n++)
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{
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float val;
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#ifdef MPC_FIXED_POINT
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val = p_buffer[n] * float_scale;
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#else
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val = p_buffer[n];
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#endif
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// sample_buffer[n] = CFSwapInt16LittleToHost(val);
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sample_buffer[n] = val;
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}
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// m_data_bytes_written += p_size * (m_bps >> 3);
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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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MPC_SAMPLE_FORMAT sampleBuffer[MPC_DECODER_BUFFER_LENGTH];
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int framesRead = 0;
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int bytesPerFrame = sizeof(float) * 2; //bitsPerSample == 16, channels == 2
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while (framesRead < frames)
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{
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//Fill from buffer, going by bufferFrames
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//if still needs more, decode and repeat
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if (bufferFrames == 0)
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{
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/* returns the length of the samples*/
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unsigned status = mpc_decoder_decode(&decoder, sampleBuffer, 0, 0);
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if (status == (unsigned)( -1))
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{
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//decode error
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DLog(@"Decode error");
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return 0;
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}
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else if (status == 0) //EOF
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{
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return 0;
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}
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else //status>0 /* status == MPC_FRAME_LENGTH */
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{
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}
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bufferFrames = status;
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}
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int framesToRead = bufferFrames;
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if (bufferFrames > frames)
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{
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framesToRead = frames;
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}
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[self writeToBuffer:((float*)(buf + (framesRead*bytesPerFrame))) fromBuffer:sampleBuffer frames: bufferFrames];
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frames -= framesToRead;
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framesRead += framesToRead;
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bufferFrames -= framesToRead;
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if (bufferFrames > 0)
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{
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memmove((uint8_t *)sampleBuffer, ((uint8_t *)sampleBuffer) + (framesToRead * bytesPerFrame), bufferFrames * bytesPerFrame);
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}
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}
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return framesRead;
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}
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- (void)close
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{
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[source close];
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}
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- (long)seek:(long)sample
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{
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mpc_decoder_seek_sample(&decoder, sample);
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return sample;
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}
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- (void)setSource:(id<CogSource>)s
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{
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[s retain];
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[source release];
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source = s;
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}
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- (id<CogSource>)source
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{
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return source;
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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:bitrate], @"bitrate",
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[NSNumber numberWithFloat:frequency], @"sampleRate",
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[NSNumber numberWithDouble:totalFrames], @"totalFrames",
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[NSNumber numberWithInt:32], @"bitsPerSample",
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[NSNumber numberWithBool:YES], @"floatingPoint",
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[NSNumber numberWithInt:2], @"channels",
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[NSNumber numberWithBool:[source seekable]], @"seekable",
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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 arrayWithObject:@"mpc"];
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}
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+ (NSArray *)mimeTypes
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{
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return [NSArray arrayWithObjects:@"audio/x-musepack", nil];
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}
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@end
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