Aren/haiku
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

This update adds a BeOS R5 compatible B_TIMECODE_DEFAULT.

Browse Source 
Submitted by David McPaul.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@853 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
beveloper 2002-08-22 23:16:18 +00:00
parent ff1ade6b3d
commit d0aedf22d8
1 changed files with 62 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

81
src/kits/media/TimeCode.cpp
View File

@ -9,27 +9,34 @@
status_t us_to_timecode(bigtime_t micros, int * hours, int * minutes, int * seconds, int * frames, const timecode_info * code = NULL)
{
int fps_div;
int32 l_frames;
CALLED();
if (code) {
// We have a valid timecode_info
fps_div = code->fps_div;
switch (code->type) {
case B_TIMECODE_DEFAULT: // NTSC
case B_TIMECODE_30_DROP_2: // NTSC
l_frames = int32((((micros % 1000000) * 29.97) / 1000000) + (micros / 1000000 * 29.97));
break;
case B_TIMECODE_30_DROP_4: // Brazil
l_frames = int32((((micros % 1000000) * 29.95) / 1000000) + (micros / 1000000 * 29.95));
break;
default:
l_frames = (((micros % 1000000) * code->fps_div) / 1000000) + (micros / 1000000 * code->fps_div);
break;
};
} else {
fps_div = 25; // PAL Default
// Convert us to frames
l_frames = int32((((micros % 1000000) * 29.97) / 1000000) + (micros / 1000000 * 29.97));
}
// Convert us to frames
l_frames = (((micros % 1000) * fps_div) / 1000) + (micros / 1000 * fps_div);
return frames_to_timecode(l_frames, hours, minutes, seconds, frames, code);
}
status_t timecode_to_us(int hours, int minutes, int seconds, int frames, bigtime_t * micros, const timecode_info * code = NULL)
{
int fps_div;
int32 l_frames;
CALLED();
@ -38,12 +45,23 @@ status_t timecode_to_us(int hours, int minutes, int seconds, int frames, bigtime
if (code) {
// We have a valid timecode_info
fps_div = code->fps_div;
switch (code->type) {
case B_TIMECODE_DEFAULT: // NTSC
case B_TIMECODE_30_DROP_2: // NTSC
*micros = bigtime_t(l_frames * ((1000000 / 29.97) + 0.5));
break;
case B_TIMECODE_30_DROP_4: // Brazil
*micros = bigtime_t(l_frames * ((1000000 / 29.95) + 0.5));
break;
default:
*micros = l_frames * 1000000 / code->fps_div;
break;
};
} else {
fps_div = 25; // PAL Default
*micros = bigtime_t(l_frames * ((1000000 / 29.97) + 0.5));
}
*micros = l_frames * 1000 / fps_div;
return B_OK;
}
return B_ERROR;
@ -59,7 +77,7 @@ status_t frames_to_timecode(int32 l_frames, int * hours, int * minutes, int * se
CALLED();
if (code) {
// We have a valid timecode_info so get the fps_div
// We have a valid timecode_info so use it
fps_div = code->fps_div;
if (code->every_nth > 0) {
@ -86,8 +104,25 @@ status_t frames_to_timecode(int32 l_frames, int * hours, int * minutes, int * se
// l_frames should now include all adjusted frames
}
} else {
// no timecode_info so set a default that doesn't use drop frames :-)
fps_div = 25; // PAL Default
// no timecode_info so set default NTSC :-(
fps_div = 30; // NTSC Default
total_mins = l_frames / fps_div / 60;
// "every_nth" minute we gain "drop_frames" "except_nth" minute
extra_frames = 2*(total_mins) - 2*(total_mins/10);
l_frames += extra_frames;
total_mins = l_frames / fps_div / 60;
extra_frames2 = 2*(total_mins) - 2*(total_mins/10);
// Gaining frames may mean that we gain more frames so we keep adjusting until no more to adjust
while (extra_frames != extra_frames2) {
l_frames += extra_frames2 - extra_frames;
extra_frames = extra_frames2;
total_mins = l_frames / fps_div / 60;
extra_frames2 = 2*(total_mins) - 2*(total_mins/10);
}
}
// convert frames to seconds leaving the remainder as frames
@ -128,9 +163,14 @@ status_t timecode_to_frames(int hours, int minutes, int seconds, int frames, int
}
} else {
*l_frames = (hours * 60) + minutes;
*l_frames = (*l_frames * 60) + seconds;
*l_frames = (*l_frames * 25) + frames;
total_mins = (hours * 60) + minutes;
*l_frames = (total_mins * 60) + seconds;
*l_frames = (*l_frames * 30) + frames;
// Adjust "every_nth" minute we lose "drop_frames" "except_nth" minute
extra_frames = 2*(total_mins) - 2*(total_mins/10);
*l_frames = *l_frames - extra_frames;
}
return B_OK;
@ -141,7 +181,7 @@ status_t get_timecode_description(timecode_type type, timecode_info * out_timeco
CALLED();
out_timecode->type = type;
strncpy(out_timecode->format,"%.2i:%.2i:%.2i.%.2i",31);
strncpy(out_timecode->format,"%.2ih:%.2im:%.2is.%.2i",31);
out_timecode->every_nth = 0;
out_timecode->except_nth = 0;
@ -185,8 +225,11 @@ status_t get_timecode_description(timecode_type type, timecode_info * out_timeco
out_timecode->fps_div = 18;
break;
default:
strncpy(out_timecode->name,"PAL",31);
out_timecode->fps_div = 25;
strncpy(out_timecode->name,"NTSC",31);
out_timecode->fps_div = 30; // This is supposed to be 29.97fps but can be simulated using the drop frame format below
out_timecode->drop_frames = 2; // Drop 2 frames
out_timecode->every_nth = 1; // every 1 minutes
out_timecode->except_nth = 10; // except every 10 minutes
break;
}