Mercurial > sdl-ios-xcode
annotate docs/man3/SDL_CDPlayTracks.3 @ 3880:74e828c64315 SDL-1.2
Fixed bug #292
I might be on crack here.
It looks like SDL_ConvertMono() in src/audio/SDL_audiocvt.c adds the left and
right channels of a stereo stream together, and clamps the new mono channel if
it would overflow.
Shouldn't it be dividing by 2 to average the two sample points instead of
clamping? Otherwise the mono sample point's volume doubles in the conversion.
This would also make the conversion faster, as it replaces two branches per
sample frame with a bitwise shift.
--ryan.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 24 Sep 2006 15:45:37 +0000 |
| parents | e5bc29de3f0a |
| children | 546f7c1eb755 |
| rev | line source |
|---|---|
|
181
e5bc29de3f0a
Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
55
diff
changeset
|
1 .TH "SDL_CDPlayTracks" "3" "Tue 11 Sep 2001, 22:58" "SDL" "SDL API Reference" |
| 0 | 2 .SH "NAME" |
| 3 SDL_CDPlayTracks\- Play the given CD track(s) | |
| 4 .SH "SYNOPSIS" | |
| 5 .PP | |
| 6 \fB#include "SDL\&.h" | |
| 7 .sp | |
| 8 \fBint \fBSDL_CDPlayTracks\fP\fR(\fBSDL_CD *cdrom, int start_track, int start_frame, int ntracks, int nframes)\fR); | |
| 9 .SH "DESCRIPTION" | |
| 10 .PP | |
| 11 \fBSDL_CDPlayTracks\fP plays the given CD starting at track \fBstart_track\fR, for \fBntracks\fR tracks\&. | |
| 12 .PP | |
| 13 \fBstart_frame\fR is the frame offset, from the beginning of the \fBstart_track\fR, at which to start\&. \fBnframes\fR is the frame offset, from the beginning of the last track (\fBstart_track\fR+\fBntracks\fR), at which to end playing\&. | |
| 14 .PP | |
| 15 \fBSDL_CDPlayTracks\fP should only be called after calling \fI\fBSDL_CDStatus\fP\fR to get track information about the CD\&. | |
| 16 .PP | |
| 17 .RS | |
| 18 \fBNote: | |
| 19 .PP | |
| 20 Data tracks are ignored\&. | |
| 21 .RE | |
| 22 .SH "RETURN VALUE" | |
| 23 .PP | |
| 24 Returns \fB0\fR, or \fB-1\fR if there was an error\&. | |
| 25 .SH "EXAMPLES" | |
| 26 .PP | |
| 27 .PP | |
| 28 .nf | |
| 29 \f(CW/* assuming cdrom is a previously opened device */ | |
| 30 /* Play the entire CD */ | |
| 31 if(CD_INDRIVE(SDL_CDStatus(cdrom))) | |
| 32 SDL_CDPlayTracks(cdrom, 0, 0, 0, 0); | |
| 33 | |
| 34 /* Play the first track */ | |
| 35 if(CD_INDRIVE(SDL_CDStatus(cdrom))) | |
| 36 SDL_CDPlayTracks(cdrom, 0, 0, 1, 0); | |
| 37 | |
| 38 /* Play first 15 seconds of the 2nd track */ | |
| 39 if(CD_INDRIVE(SDL_CDStatus(cdrom))) | |
| 40 SDL_CDPlayTracks(cdrom, 1, 0, 0, CD_FPS*15);\fR | |
| 41 .fi | |
| 42 .PP | |
| 43 | |
| 44 .SH "SEE ALSO" | |
| 45 .PP | |
| 46 \fI\fBSDL_CDPlay\fP\fR, \fI\fBSDL_CDStatus\fP\fR, \fI\fBSDL_CD\fP\fR | |
|
181
e5bc29de3f0a
Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
55
diff
changeset
|
47 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 22:58 |