cog/Sound/SoundFile/MPEGFile.mm

113 lines
2.2 KiB
Plaintext

//
// MPEGFile.m
// zyVorbis
//
// Created by Vincent Spader on 1/30/05.
// Copyright 2005 Vincent Spader All rights reserved.
//
#import "MPEGFile.h"
@implementation MPEGFile
- (BOOL)open:(const char *)filename
{
int err;
// DBLog(@"Opening: %s!!!!", filename);
err = DecMPA_CreateUsingFile(&decoder, filename, DECMPA_VERSION);
if (err != DECMPA_OK)
return NO;
DecMPA_SetParam(decoder, DECMPA_PARAM_OUTPUT, DECMPA_OUTPUT_INT16);
long n;
DecMPA_DecodeNoData(decoder, &n);
// DBLog(@"Woot: %i", n);
DecMPA_OutputFormat outputFormat;
err = DecMPA_GetOutputFormat(decoder, &outputFormat);
if (err != DECMPA_OK)
return NO;
frequency = outputFormat.nFrequency;
channels = outputFormat.nChannels;
bitsPerSample = 16;
isBigEndian = hostIsBigEndian();
long duration;
DecMPA_GetDuration(decoder, &duration);
totalSize = (long int)(duration*(double)frequency/1000.0*channels*bitsPerSample/8);
DecMPA_MPEGHeader mpegHeader;
DecMPA_GetMPEGHeader(decoder, &mpegHeader);
// int totalRate = mpegHeader.nBitRateKbps;
// int num = 0;
/*
while (DecMPA_DecodeNoData(decoder, &n) == DECMPA_OK)
{
DecMPA_GetMPEGHeader(decoder, &mpegHeader);
totalRate += mpegHeader.nBitRateKbps;
DBLog(@"%i %i %i", num, mpegHeader.nBitRateIndex, mpegHeader.nBitRateKbps);
num++;
}
err = DecMPA_GetMPEGHeader(decoder, &mpegHeader);
*/
bitrate = mpegHeader.nBitRateKbps;
// DBLog(@"Bitrate? %i", mpegHeader.);
// DBLog(@"Mpeg file opened.");
err = DecMPA_SeekToTime(decoder, 0);
if (err != DECMPA_OK)
return NO;
return YES;
}
- (BOOL)readInfo:(const char *)filename
{
[self open:filename];
return YES;
}
- (int)fillBuffer:(void *)buf ofSize:(UInt32)size
{
long numread;
long total = 0;
DecMPA_Decode(decoder, &((char *)buf)[total], size - total, &numread);
while (total != size && numread > 0)
{
total += numread;
DecMPA_Decode(decoder, &((char *)buf)[total], size - total, &numread);
}
/*
int n;
for (n = 0; n < total/2; n++)
{
((UInt16 *)buf)[n] = CFSwapInt16BigToHost(((UInt16 *)buf)[n]);
}
*/
return total;
}
- (void)close
{
if (decoder)
DecMPA_Destroy(decoder);
decoder = NULL;
}
- (double)seekToTime:(double)milliseconds
{
DecMPA_SeekToTime(decoder, (unsigned long)milliseconds);
return milliseconds;
}
@end