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vf_tinterlace: implement interlace mode 5

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Allow creating interlaced bottom field first video.
This commit is contained in:
Stefano Sabatini 2011-12-31 14:12:01 +01:00
parent 8dc973e6d1
commit 42a8ac94d9
3 changed files with 18 additions and 11 deletions
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4
doc/filters.texi
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@ -2525,6 +2525,10 @@ generating a frame with double height at the same input framerate.
@item 4
Interleave the upper field from odd frames with the lower field from
even frames, generating a frame with unchanged height at half framerate.
@item 5
Interleave the lower field from odd frames with the upper field from
even frames, generating a frame with unchanged height at half framerate.
@end table
Default mode is 0.

2
libavfilter/avfilter.h
View File

@ -31,7 +31,7 @@
#define LIBAVFILTER_VERSION_MAJOR 2
#define LIBAVFILTER_VERSION_MINOR 57
#define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_MICRO 101
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \

23
libavfilter/vf_tinterlace.c
View File

@ -68,9 +68,9 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
if (args) {
n = sscanf(args, "%d", &tinterlace->mode);
if (n != 1 || tinterlace->mode < 0 || tinterlace->mode > 4) {
if (n != 1 || tinterlace->mode < 0 || tinterlace->mode > 5) {
av_log(ctx, AV_LOG_ERROR,
"Invalid mode '%s', use an integer between 0 and 4\n", args);
"Invalid mode '%s', use an integer between 0 and 5\n", args);
return AVERROR(EINVAL);
}
}
@ -179,7 +179,7 @@ static void end_frame(AVFilterLink *inlink)
AVFilterBufferRef *cur = tinterlace->cur;
AVFilterBufferRef *next = tinterlace->next;
AVFilterBufferRef *out = NULL;
int field;
int field, tff;
/* we need at least two frames */
if (!tinterlace->cur)
@ -234,23 +234,26 @@ static void end_frame(AVFilterLink *inlink)
FIELD_UPPER_AND_LOWER, 1, !field);
break;
case 4: /* interleave upper lines from odd frames with lower lines from even frames,
* halving the frame rate and preserving image height */
/* interleave upper/lower lines from odd frames with lower/upper lines from even frames,
* halving the frame rate and preserving image height */
case 4: /* top field first */
case 5: /* bottom field first */
tff = tinterlace->mode == 4;
out = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
avfilter_copy_buffer_ref_props(out, cur);
out->video->interlaced = 1;
out->video->top_field_first = 1;
out->video->top_field_first = tff;
/* copy upper field from cur */
/* copy upper/lower field from cur */
copy_picture_field(out->data, out->linesize,
cur->data, cur->linesize,
inlink->format, inlink->w, inlink->h,
FIELD_UPPER, 1, FIELD_UPPER);
/* copy lower fields from next */
tff ? FIELD_UPPER : FIELD_LOWER, 1, tff ? FIELD_UPPER : FIELD_LOWER);
/* copy lower/upper field from next */
copy_picture_field(out->data, out->linesize,
next->data, next->linesize,
inlink->format, inlink->w, inlink->h,
FIELD_LOWER, 1, FIELD_LOWER);
tff ? FIELD_LOWER : FIELD_UPPER, 1, tff ? FIELD_LOWER : FIELD_UPPER);
avfilter_unref_buffer(tinterlace->next);
tinterlace->next = NULL;
break;