108 lines
2.3 KiB
Matlab
108 lines
2.3 KiB
Matlab
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//
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// MPEGFile.m
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// zyVorbis
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//
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// Created by Vincent Spader on 1/30/05.
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// Copyright 2005 __MyCompanyName__. All rights reserved.
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//
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#import "MPEGFile.h"
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@implementation MPEGFile
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- (BOOL)open:(const char *)filename
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{
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int err;
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// DBLog(@"Opening: %s!!!!", filename);
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err = DecMPA_CreateUsingFile(&decoder, filename, DECMPA_VERSION);
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if (err != DECMPA_OK)
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return NO;
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DecMPA_SetParam(decoder, DECMPA_PARAM_OUTPUT, DECMPA_OUTPUT_INT16);
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long n;
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DecMPA_DecodeNoData(decoder, &n);
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// DBLog(@"Woot: %i", n);
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DecMPA_OutputFormat outputFormat;
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err = DecMPA_GetOutputFormat(decoder, &outputFormat);
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if (err != DECMPA_OK)
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return NO;
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frequency = outputFormat.nFrequency;
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channels = outputFormat.nChannels;
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bitsPerSample = 16;
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isBigEndian = YES;
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long duration;
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DecMPA_GetDuration(decoder, &duration);
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totalSize = (long int)(duration*(double)frequency/1000.0*channels*bitsPerSample/8);
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DecMPA_MPEGHeader mpegHeader;
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DecMPA_GetMPEGHeader(decoder, &mpegHeader);
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// int totalRate = mpegHeader.nBitRateKbps;
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// int num = 0;
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/*
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while (DecMPA_DecodeNoData(decoder, &n) == DECMPA_OK)
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{
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DecMPA_GetMPEGHeader(decoder, &mpegHeader);
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totalRate += mpegHeader.nBitRateKbps;
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DBLog(@"%i %i %i", num, mpegHeader.nBitRateIndex, mpegHeader.nBitRateKbps);
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num++;
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}
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err = DecMPA_GetMPEGHeader(decoder, &mpegHeader);
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*/
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bitRate = mpegHeader.nBitRateKbps;
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// DBLog(@"Bitrate? %i", mpegHeader.);
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// DBLog(@"Mpeg file opened.");
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err = DecMPA_SeekToTime(decoder, 0);
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if (err != DECMPA_OK)
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return NO;
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return YES;
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}
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- (BOOL)readInfo:(const char *)filename
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{
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return [self open:filename]; //does the same damn thing
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}
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- (int)fillBuffer:(void *)buf ofSize:(UInt32)size
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{
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long numread;
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long total = 0;
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DecMPA_Decode(decoder, &((char *)buf)[total], size - total, &numread);
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while (total != size && numread > 0)
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{
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total += numread;
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DecMPA_Decode(decoder, &((char *)buf)[total], size - total, &numread);
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}
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/* int n;
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for (n = 0; n < total/2; n++)
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{
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((UInt16 *)buf)[n] = CFSwapInt16LittleToHost(((UInt16 *)buf)[n]);
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}
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*/
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currentPosition += total;
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return total;
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}
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- (void)close
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{
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if (decoder)
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DecMPA_Destroy(decoder);
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decoder = NULL;
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}
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- (void)seekToTime:(double)milliseconds
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{
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DecMPA_SeekToTime(decoder, (unsigned long)milliseconds);
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}
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@end
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