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avfilter/vf_tinterlace: add support for bypassing already interlaced frames

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The old interlace filter worked this way before it was merged with tinterlace.

Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint 2019-12-06 11:01:11 +01:00
parent 28b5dc6199
commit 6498522bef
4 changed files with 17 additions and 3 deletions
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6
doc/filters.texi
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@ -18122,10 +18122,12 @@ Enable complex vertical low-pass filtering.
This will slightly less reduce interlace 'twitter' and Moire
patterning but better retain detail and subjective sharpness impression.
@item bypass_il
Bypass already interlaced frames, only adjust the frame rate.
@end table
Vertical low-pass filtering can only be enabled for @option{mode}
@var{interleave_top} and @var{interleave_bottom}.
Vertical low-pass filtering and bypassing already interlaced frames can only be
enabled for @option{mode} @var{interleave_top} and @var{interleave_bottom}.
@end table

1
libavfilter/tinterlace.h
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@ -36,6 +36,7 @@
#define TINTERLACE_FLAG_VLPF 01
#define TINTERLACE_FLAG_CVLPF 2
#define TINTERLACE_FLAG_EXACT_TB 4
#define TINTERLACE_FLAG_BYPASS_IL 8
enum VLPFilter {
VLPF_OFF = 0,

2
libavfilter/version.h
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@ -31,7 +31,7 @@
#define LIBAVFILTER_VERSION_MAJOR 7
#define LIBAVFILTER_VERSION_MINOR 68
#define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_MICRO 101
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

11
libavfilter/vf_tinterlace.c
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@ -53,6 +53,7 @@ static const AVOption tinterlace_options[] = {
{"complex_filter", "enable complex vertical low-pass filter", 0, AV_OPT_TYPE_CONST, {.i64 = TINTERLACE_FLAG_CVLPF},INT_MIN, INT_MAX, FLAGS, "flags" },
{"cvlpf", "enable complex vertical low-pass filter", 0, AV_OPT_TYPE_CONST, {.i64 = TINTERLACE_FLAG_CVLPF},INT_MIN, INT_MAX, FLAGS, "flags" },
{"exact_tb", "force a timebase which can represent timestamps exactly", 0, AV_OPT_TYPE_CONST, {.i64 = TINTERLACE_FLAG_EXACT_TB}, INT_MIN, INT_MAX, FLAGS, "flags" },
{"bypass_il", "bypass already interlaced frames", 0, AV_OPT_TYPE_CONST, {.i64 = TINTERLACE_FLAG_BYPASS_IL}, INT_MIN, INT_MAX, FLAGS, "flags" },
{NULL}
};
@ -439,6 +440,16 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
* halving the frame rate and preserving image height */
case MODE_INTERLEAVE_TOP: /* top field first */
case MODE_INTERLEAVE_BOTTOM: /* bottom field first */
if ((tinterlace->flags & TINTERLACE_FLAG_BYPASS_IL) && cur->interlaced_frame) {
av_log(ctx, AV_LOG_WARNING,
"video is already interlaced, adjusting framerate only\n");
out = av_frame_clone(cur);
if (!out)
return AVERROR(ENOMEM);
out->pts /= 2; // adjust pts to new framerate
ret = ff_filter_frame(outlink, out);
return ret;
}
tff = tinterlace->mode == MODE_INTERLEAVE_TOP;
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out)