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--- src/audiodecoding/mp3/k3bmaddecoder.cpp.orig Mon Sep 1 12:14:10 2003
+++ src/audiodecoding/mp3/k3bmaddecoder.cpp Fri Nov 7 12:35:44 2003
@@ -37,6 +37,8 @@
#include <stdlib.h>
#include <cmath>
#include <cstdlib>
+#include <sys/types.h>
+#include <sys/mman.h>
#include <config.h>
@@ -716,23 +718,24 @@
return false;
}
- // there seem to be mp3 files starting with a lot of zeros
- // we try to skip these.
- // there might still be files with more than bufLen zeros...
- const int bufLen = 4096;
- char buf[bufLen];
- if( f.readBlock( buf, bufLen ) < bufLen ) {
- kdDebug() << "(K3bMadDecoder) unable to read " << bufLen << " bytes from " << url.path() << endl;
+ // EXPERIMENTAL!!!!!!!!
+
+ const int bufLen = f.size();
+ const char * buf = (const char *)mmap(0, bufLen, PROT_READ, MAP_SHARED, f.handle(), 0);
+ if (buf == MAP_FAILED)
+ {
+ kdDebug() << "(K3bMp3Module) unable to read from " << url.path() << endl;
f.close();
return false;
}
- f.close();
// skip any 0
int i = 0;
while( i < bufLen && buf[i] == '\0' ) i++;
if( i == bufLen ) {
kdDebug() << "(K3bMadDecoder) only zeros found in the beginning of " << url.path() << endl;
+ munmap((void *)buf, bufLen);
+ f.close();
return false;
}
@@ -744,6 +747,8 @@
( (unsigned short)buf[i+3] < 0xff && (unsigned short)buf[i+4] < 0xff ) ) {
kdDebug() << "(K3bMadDecoder) found id3 magic: ID3 "
<< (unsigned short)buf[i+3] << "." << (unsigned short)buf[i+4] << endl;
+ munmap((void *)buf, bufLen);
+ f.close();
return true;
}
@@ -756,15 +761,22 @@
short m = (short)( buf[i+20] | (buf[i+21]<<8) );
if( m == 80 ) {
kdDebug() << "(K3bMadDecoder) found RIFF MPEG magic." << endl;
+ munmap((void *)buf, bufLen);
+ f.close();
return true;
}
else if( m == 85 ) {
kdDebug() << "(K3bMadDecoder) found RIFF MPEG III magic." << endl;
+ munmap((void *)buf, bufLen);
+ f.close();
return true;
}
- else
+ else {
+ munmap((void *)buf, bufLen);
+ f.close();
return false;
}
+ }
@@ -775,16 +787,41 @@
mad_stream_init( &stream );
mad_header_init( &header );
- mad_stream_buffer( &stream, (unsigned char*)&buf[i], bufLen-i );
- stream.error = MAD_ERROR_NONE;
+ mad_stream_buffer( &stream, (unsigned char*)buf, bufLen );
+ unsigned long bitrate, kbps, count;
+ int vbr;
+ bitrate = kbps = count = vbr = 0;
+ mad_timer_t duration = mad_timer_zero;
bool success = true;
- if( mad_header_decode( &header, &stream ) ) {
+ while (1) {
+ if (mad_header_decode(&header, &stream) == -1) {
+ if (MAD_RECOVERABLE(stream.error))
+ continue;
+ else
+ {
+ break;
+ }
+ }
+ if (bitrate && header.bitrate != bitrate)
+ vbr = 1;
+
+ bitrate = header.bitrate;
+
+ kbps += bitrate / 1000;
+ ++count;
+
+ mad_timer_add(&duration, header.duration);
+ }
+ kbps = count?((kbps * 2) / count + 1) / 2 * (vbr ? -1 : 1):0;
+ kdDebug() << "(K3bMp3Module) File: " << url.path() << ", bitrate: " << kbps << ", duration: " << duration.seconds << "." << duration.fraction << endl;
+ if (duration.seconds == 0 || kbps == 0)
+ {
kdDebug() << "(K3bMadDecoder) could not find mpeg header." << endl;
success = false;
}
- mad_header_finish( &header );
- mad_stream_finish( &stream );
+ munmap((void *)buf, bufLen);
+ f.close();
return success;
}
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