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vf_interlace: deprecate lowpass option
This commit is contained in:
Vittorio Giovara
parent
b23bc95920
commit
35b05c5184
@ -1426,7 +1426,8 @@ a float number which specifies chroma temporal strength, defaults to
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Simple interlacing filter from progressive contents. This interleaves upper (or
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lower) lines from odd frames with lower (or upper) lines from even frames,
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halving the frame rate and preserving image height.
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halving the frame rate and preserving image height. A vertical lowpass filter
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is always applied in order to avoid twitter effects and reduce moire patterns.
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@example
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Original Original New Frame
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@ -1446,10 +1447,6 @@ It accepts the following optional parameters:
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@item scan
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determines whether the interlaced frame is taken from the even (tff - default)
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or odd (bff) lines of the progressive frame.
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@item lowpass
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Enable (default) or disable the vertical lowpass filter to avoid twitter
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interlacing and reduce moire patterns.
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@end table
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@section lut, lutrgb, lutyuv
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@ -31,7 +31,7 @@
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#define LIBAVFILTER_VERSION_MAJOR 4
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#define LIBAVFILTER_VERSION_MINOR 1
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#define LIBAVFILTER_VERSION_MICRO 0
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#define LIBAVFILTER_VERSION_MICRO 1
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#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
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LIBAVFILTER_VERSION_MINOR, \
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@ -71,5 +71,8 @@
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#ifndef FF_API_NOCONST_GET_NAME
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#define FF_API_NOCONST_GET_NAME (LIBAVFILTER_VERSION_MAJOR < 5)
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#endif
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#ifndef FF_API_INTERLACE_LOWPASS_SET
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#define FF_API_INTERLACE_LOWPASS_SET (LIBAVFILTER_VERSION_MAJOR < 5)
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#endif
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#endif /* AVFILTER_VERSION_H */
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@ -29,6 +29,7 @@
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#include "formats.h"
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#include "avfilter.h"
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#include "internal.h"
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#include "version.h"
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#include "video.h"
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enum ScanMode {
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@ -44,7 +45,9 @@ enum FieldType {
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typedef struct {
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const AVClass *class;
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enum ScanMode scan; // top or bottom field first scanning
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#if FF_API_INTERLACE_LOWPASS_SET
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int lowpass; // enable or disable low pass filterning
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#endif
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AVFrame *cur, *next; // the two frames from which the new one is obtained
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int got_output; // signal an output frame is reday to request_frame()
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} InterlaceContext;
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@ -58,8 +61,10 @@ static const AVOption options[] = {
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AV_OPT_TYPE_CONST, {.i64 = MODE_TFF }, INT_MIN, INT_MAX, .flags = V, .unit = "scan" },
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{ "bff", "bottom field first", 0,
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AV_OPT_TYPE_CONST, {.i64 = MODE_BFF }, INT_MIN, INT_MAX, .flags = V, .unit = "scan" },
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{ "lowpass", "enable vertical low-pass filter", OFFSET(lowpass),
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#if FF_API_INTERLACE_LOWPASS_SET
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{ "lowpass", "(deprecated, this option is always set)", OFFSET(lowpass),
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AV_OPT_TYPE_INT, {.i64 = 1 }, 0, 1, .flags = V },
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#endif
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{ NULL }
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};
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@ -100,6 +105,11 @@ static int config_out_props(AVFilterLink *outlink)
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AVFilterLink *inlink = outlink->src->inputs[0];
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InterlaceContext *s = ctx->priv;
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#if FF_API_INTERLACE_LOWPASS_SET
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if (!s->lowpass)
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av_log(ctx, AV_LOG_WARNING, "This option is deprecated and always set.\n");
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#endif
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if (inlink->h < 2) {
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av_log(ctx, AV_LOG_ERROR, "input video height is too small\n");
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return AVERROR_INVALIDDATA;
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@ -111,15 +121,14 @@ static int config_out_props(AVFilterLink *outlink)
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// half framerate
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outlink->time_base.num *= 2;
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av_log(ctx, AV_LOG_VERBOSE, "%s interlacing %s lowpass filter\n",
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s->scan == MODE_TFF ? "tff" : "bff", (s->lowpass) ? "with" : "without");
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av_log(ctx, AV_LOG_VERBOSE, "%s interlacing\n",
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s->scan == MODE_TFF ? "tff" : "bff");
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return 0;
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}
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static void copy_picture_field(AVFrame *src_frame, AVFrame *dst_frame,
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AVFilterLink *inlink, enum FieldType field_type,
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int lowpass)
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AVFilterLink *inlink, enum FieldType field_type)
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{
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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int vsub = desc->log2_chroma_h;
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@ -130,6 +139,8 @@ static void copy_picture_field(AVFrame *src_frame, AVFrame *dst_frame,
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int linesize = av_image_get_linesize(inlink->format, inlink->w, plane);
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uint8_t *dstp = dst_frame->data[plane];
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const uint8_t *srcp = src_frame->data[plane];
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int srcp_linesize;
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int dstp_linesize;
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av_assert0(linesize >= 0);
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@ -138,29 +149,24 @@ static void copy_picture_field(AVFrame *src_frame, AVFrame *dst_frame,
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srcp += src_frame->linesize[plane];
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if (field_type == FIELD_LOWER)
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dstp += dst_frame->linesize[plane];
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if (lowpass) {
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int srcp_linesize = src_frame->linesize[plane] * 2;
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int dstp_linesize = dst_frame->linesize[plane] * 2;
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for (j = lines; j > 0; j--) {
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const uint8_t *srcp_above = srcp - src_frame->linesize[plane];
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const uint8_t *srcp_below = srcp + src_frame->linesize[plane];
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if (j == lines)
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srcp_above = srcp; // there is no line above
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if (j == 1)
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srcp_below = srcp; // there is no line below
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for (i = 0; i < linesize; i++) {
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// this calculation is an integer representation of
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// '0.5 * current + 0.25 * above + 0.25 * below'
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// '1 +' is for rounding.
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dstp[i] = (1 + srcp[i] + srcp[i] + srcp_above[i] + srcp_below[i]) >> 2;
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}
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dstp += dstp_linesize;
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srcp += srcp_linesize;
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srcp_linesize = src_frame->linesize[plane] * 2;
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dstp_linesize = dst_frame->linesize[plane] * 2;
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for (j = lines; j > 0; j--) {
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const uint8_t *srcp_above = srcp - src_frame->linesize[plane];
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const uint8_t *srcp_below = srcp + src_frame->linesize[plane];
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if (j == lines)
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srcp_above = srcp; // there is no line above
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if (j == 1)
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srcp_below = srcp; // there is no line below
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for (i = 0; i < linesize; i++) {
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// this calculation is an integer representation of
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// '0.5 * current + 0.25 * above + 0.25 * below'
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// '1 +' is for rounding.
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dstp[i] = (1 + srcp[i] + srcp[i] + srcp_above[i] + srcp_below[i]) >> 2;
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}
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} else {
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av_image_copy_plane(dstp, dst_frame->linesize[plane] * 2,
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srcp, src_frame->linesize[plane] * 2,
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linesize, lines);
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dstp += dstp_linesize;
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srcp += srcp_linesize;
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}
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}
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}
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@ -204,11 +210,11 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
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out->pts /= 2; // adjust pts to new framerate
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/* copy upper/lower field from cur */
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copy_picture_field(s->cur, out, inlink, tff ? FIELD_UPPER : FIELD_LOWER, s->lowpass);
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copy_picture_field(s->cur, out, inlink, tff ? FIELD_UPPER : FIELD_LOWER);
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av_frame_free(&s->cur);
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/* copy lower/upper field from next */
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copy_picture_field(s->next, out, inlink, tff ? FIELD_LOWER : FIELD_UPPER, s->lowpass);
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copy_picture_field(s->next, out, inlink, tff ? FIELD_LOWER : FIELD_UPPER);
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av_frame_free(&s->next);
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ret = ff_filter_frame(outlink, out);
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