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Reworked handling of MPEG audio frame & file info: * Fixed frame size calculation for layer 1 (all versions) and layer 2 (V2/V2.5). * Exact frame time (expressed as a fraction) for way more precise playtime calculation at 44100/22050/11025Hz sample frequency. * Exact playtime<->position conversion for CBR also used for resume position. * More compact code, long policy.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7505 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2005-09-10 12:28:16 +00:00
parent 1996dca15a
commit ec9b202a92
10 changed files with 138 additions and 159 deletions
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12
firmware/mpeg.c
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@ -348,7 +348,7 @@ static void set_elapsed(struct mp3entry* id3)
/* find wich percent we're at */
for (i=0; i<100; i++ )
{
if ( id3->offset < (int)(id3->toc[i] * (id3->filesize / 256)) )
if ( id3->offset < id3->toc[i] * (id3->filesize / 256) )
{
break;
}
@ -388,8 +388,8 @@ static void set_elapsed(struct mp3entry* id3)
}
}
else
/* constant bitrate == simple frame calculation */
id3->elapsed = id3->offset / id3->bpf * id3->tpf;
/* constant bitrate, use exact calculation */
id3->elapsed = id3->offset / (id3->bitrate / 8);
}
int audio_get_file_pos(void)
@ -405,7 +405,7 @@ int audio_get_file_pos(void)
unsigned int percent, remainder;
int curtoc, nexttoc, plen;
percent = (id3->elapsed*100)/id3->length;
percent = (id3->elapsed*100)/id3->length;
if (percent > 99)
percent = 99;
@ -431,8 +431,8 @@ int audio_get_file_pos(void)
(id3->elapsed / 1000);
}
}
else if (id3->bpf && id3->tpf)
pos = (id3->elapsed/id3->tpf)*id3->bpf;
else if (id3->bitrate)
pos = id3->elapsed * (id3->bitrate / 8);
else
{
return -1;