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add --preframes, update documentation

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git-svn-id: svn://scm.orgis.org/mpg123/trunk@2051 35dc7657-300d-0410-a2e5-dc2837fedb53
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thor
2009-05-17 00:36:30 +00:00
parent a8939fcc2d
commit dd47d27f5e
3 changed files with 16 additions and 1 deletions
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8
man1/mpg123.1
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@@ -125,6 +125,14 @@ Do not accept ICY meta data.
\fB\-i, \-\^-\index
Index / scan through the track before playback.
This fills the index table for seeking (if enabled in libmpg123) and may make the operating system cache the file contents for smoother operating on playback.
.TP
\fB\-\-index\-size \fIsize\fR
Set the number of entries in the seek frame index table.
.TP
\fB\-\-preframes \fInum\fR
Set the number of frames to be read as lead-in before a seeked-to position.
This serves to fill the layer 3 bit reservoir, which is needed to faithfully reproduce a certain sample at a certain position.
Note that for layer 3, a minimum of 1 is enforced (because of frame overlap), and for layer 1 and 2, this is limited to 2 (no bit reservoir in that case, but engine spin-up anyway).
.SH OUTPUT and PROCESSING OPTIONS
.TP

8
src/mpg123.c
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@@ -112,6 +112,7 @@ struct parameter param = {
,INDEX_SIZE
,NULL /* force_encoding */
,1. /* preload */
,-1 /* preframes */
};
mpg123_handle *mh = NULL;
@@ -441,6 +442,7 @@ topt opts[] = {
{0, "no-seekbuffer", GLO_INT, unset_frameflag, &frameflag, MPG123_SEEKBUFFER},
{'e', "encoding", GLO_ARG|GLO_CHAR, 0, &param.force_encoding, 0},
{0, "preload", GLO_ARG|GLO_DOUBLE, 0, &param.preload, 0},
{0, "preframes", GLO_ARG|GLO_LONG, 0, &param.preframes, 0},
{0, 0, 0, 0, 0, 0}
};
@@ -724,6 +726,7 @@ int main(int argc, char *argv[])
param.flags = (int) parr;
param.flags |= MPG123_SEEKBUFFER; /* Default on, for HTTP streams. */
mpg123_getpar(mp, MPG123_RESYNC_LIMIT, &param.resync_limit, NULL);
mpg123_getpar(mp, MPG123_PREFRAMES, &param.preframes, NULL);
#ifdef OS2
_wildcard(&argc,&argv);
@@ -822,6 +825,8 @@ int main(int argc, char *argv[])
#endif
&& ++libpar
&& MPG123_OK == (result = mpg123_par(mp, MPG123_OUTSCALE, param.outscale, 0))
&& ++libpar
&& MPG123_OK == (result = mpg123_par(mp, MPG123_PREFRAMES, param.preframes, 0))
))
{
error2("Cannot set library parameter %i: %s", libpar, mpg123_plain_strerror(result));
@@ -1145,7 +1150,8 @@ static void long_usage(int err)
fprintf(o," -Z --random full random play\n");
fprintf(o," --no-icy-meta Do not accept ICY meta data\n");
fprintf(o," -i --index index / scan through the track before playback\n");
fprintf(o," --index-size change size of frame index\n");
fprintf(o," --index-size <n> change size of frame index\n");
fprintf(o," --preframes <n> number of frames to decode in advance after seeking (to keep layer 3 bit reservoir happy)\n");
fprintf(o," --resync-limit <n> Set number of bytes to search for valid MPEG data; <0 means search whole stream.\n");
fprintf(o,"\noutput/processing options\n\n");
fprintf(o," -o <o> --output <o> select audio output module\n");

1
src/mpg123app.h
View File

@@ -98,6 +98,7 @@ struct parameter
long index_size; /* size of frame index */
char *force_encoding;
double preload; /* buffer preload size (fraction of full buffer) */
long preframes;
};
extern char *equalfile;