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lavfi: port tinterlace filter from MPlayer

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Port MPlayer tinterlace filter from MPlayer, with some ideas taken
from the FFmbc/libavfilter port, with the following main differences:

* added support for full-scale YUVJ formats
* added support for YUVA420P
* request_frame() on the filter is forced to return a frame
* some code factorization (related to the copy_picture_fields() function)
* fixed black padding values for mode 3
This commit is contained in:
Stefano Sabatini 2011-06-25 13:06:24 +02:00 committed by Stefano Sabatini
parent 549b53e8cb
commit 8fb03b4d70
7 changed files with 365 additions and 2 deletions
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1
Changelog
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@ -11,6 +11,7 @@ version next:
- thumbnail video filter
- XML output in ffprobe
- asplit audio filter
- tinterlace video filter
version 0.9:

1
configure vendored
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@ -1652,6 +1652,7 @@ mptestsrc_filter_deps="gpl"
negate_filter_deps="lut_filter"
ocv_filter_deps="libopencv"
scale_filter_deps="swscale"
tinterlace_filter_deps="gpl"
yadif_filter_deps="gpl"
# libraries

34
doc/filters.texi
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@ -2433,6 +2433,40 @@ Complete example of a thumbnail creation with @command{ffmpeg}:
ffmpeg -i in.avi -vf thumbnail,scale=300:200 -frames:v 1 out.png
@end example
@section tinterlace
Perform various types of temporal field interlacing.
Frames are counted starting from 1, so the first input frame is
considered odd.
This filter accepts a single parameter specifying the mode. Available
modes are:
@table @samp
@item 0
Move odd frames into the upper field, even into the lower field,
generating a double height frame at half framerate.
@item 1
Only output even frames, odd frames are dropped, generating a frame with
unchanged height at half framerate.
@item 2
Only output odd frames, even frames are dropped, generating a frame with
unchanged height at half framerate.
@item 3
Expand each frame to full height, but pad alternate lines with black,
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.
@end table
Default mode is 0.
@section transpose
Transpose rows with columns in the input video and optionally flip it.

1
libavfilter/Makefile
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@ -81,6 +81,7 @@ OBJS-$(CONFIG_SHOWINFO_FILTER) += vf_showinfo.o
OBJS-$(CONFIG_SLICIFY_FILTER) += vf_slicify.o
OBJS-$(CONFIG_SPLIT_FILTER) += vf_split.o
OBJS-$(CONFIG_THUMBNAIL_FILTER) += vf_thumbnail.o
OBJS-$(CONFIG_TINTERLACE_FILTER) += vf_tinterlace.o
OBJS-$(CONFIG_TRANSPOSE_FILTER) += vf_transpose.o
OBJS-$(CONFIG_UNSHARP_FILTER) += vf_unsharp.o
OBJS-$(CONFIG_VFLIP_FILTER) += vf_vflip.o

1
libavfilter/allfilters.c
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@ -91,6 +91,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (SLICIFY, slicify, vf);
REGISTER_FILTER (SPLIT, split, vf);
REGISTER_FILTER (THUMBNAIL, thumbnail, vf);
REGISTER_FILTER (TINTERLACE, tinterlace, vf);
REGISTER_FILTER (TRANSPOSE, transpose, vf);
REGISTER_FILTER (UNSHARP, unsharp, vf);
REGISTER_FILTER (VFLIP, vflip, vf);

4
libavfilter/avfilter.h
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@ -30,8 +30,8 @@
#include "libavcodec/avcodec.h"
#define LIBAVFILTER_VERSION_MAJOR 2
#define LIBAVFILTER_VERSION_MINOR 55
#define LIBAVFILTER_VERSION_MICRO 101
#define LIBAVFILTER_VERSION_MINOR 56
#define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \

325
libavfilter/vf_tinterlace.c Normal file
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@ -0,0 +1,325 @@
/*
* Copyright (c) 2011 Stefano Sabatini
* Copyright (c) 2010 Baptiste Coudurier
* Copyright (c) 2003 Michael Zucchi <notzed@ximian.com>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with FFmpeg if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/**
* @file
* temporal field interlace filter, ported from MPlayer/libmpcodecs
*/
#include "libavutil/imgutils.h"
#include "avfilter.h"
#include "internal.h"
typedef struct {
int mode; ///< interlace mode selected
int frame; ///< number of the output frame
int vsub; ///< chroma vertical subsampling
AVFilterBufferRef *cur;
AVFilterBufferRef *next;
uint8_t *black_data[4]; ///< buffer used to fill padded lines
int black_linesize[4];
} TInterlaceContext;
#define FULL_SCALE_YUVJ_FORMATS \
PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ444P, PIX_FMT_YUVJ440P
static enum PixelFormat full_scale_yuvj_pix_fmts[] = {
FULL_SCALE_YUVJ_FORMATS, PIX_FMT_NONE
};
static int query_formats(AVFilterContext *ctx)
{
static const enum PixelFormat pix_fmts[] = {
PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_YUV444P,
PIX_FMT_YUV444P, PIX_FMT_YUV410P, PIX_FMT_YUVA420P,
PIX_FMT_GRAY8, FULL_SCALE_YUVJ_FORMATS,
PIX_FMT_NONE
};
avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
return 0;
}
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
{
TInterlaceContext *tinterlace = ctx->priv;
int n;
tinterlace->mode = 0;
if (args) {
n = sscanf(args, "%d", &tinterlace->mode);
if (n != 1 || tinterlace->mode < 0 || tinterlace->mode > 4) {
av_log(ctx, AV_LOG_ERROR,
"Invalid mode '%s', use an integer between 0 and 4\n", args);
return AVERROR(EINVAL);
}
}
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
TInterlaceContext *tinterlace = ctx->priv;
if (tinterlace->cur ) avfilter_unref_buffer(tinterlace->cur );
if (tinterlace->next) avfilter_unref_buffer(tinterlace->next);
av_freep(&tinterlace->black_data[0]);
}
static int config_out_props(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
AVFilterLink *inlink = outlink->src->inputs[0];
const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[outlink->format];
TInterlaceContext *tinterlace = ctx->priv;
tinterlace->vsub = desc->log2_chroma_h;
outlink->w = inlink->w;
outlink->h = tinterlace->mode == 0 || tinterlace->mode == 3 ?
inlink->h*2 : inlink->h;
if (tinterlace->mode == 3) {
uint8_t black[4] = { 16, 128, 128, 16 };
int i, ret;
if (ff_fmt_is_in(outlink->format, full_scale_yuvj_pix_fmts))
black[0] = black[3] = 0;
ret = av_image_alloc(tinterlace->black_data, tinterlace->black_linesize,
outlink->w, outlink->h, outlink->format, 1);
if (ret < 0)
return ret;
/* fill black picture with black */
for (i = 0; i < 4 && tinterlace->black_data[i]; i++) {
int h = i == 1 || i == 2 ? outlink->h >> desc->log2_chroma_h : outlink->h;
memset(tinterlace->black_data[i], black[i],
tinterlace->black_linesize[i] * h);
}
}
av_log(ctx, AV_LOG_INFO, "mode:%d h:%d -> h:%d\n",
tinterlace->mode, inlink->h, outlink->h);
return 0;
}
#define FIELD_UPPER 0
#define FIELD_LOWER 1
#define FIELD_UPPER_AND_LOWER 2
/**
* Copy picture field from src to dst.
*
* @param src_field copy from upper, lower field or both
* @param interleave leave a padding line between each copied field
* @param dst_field copy to upper or lower field,
* only meaningful when interleave is selected
*/
static inline
void copy_picture_field(uint8_t *dst[4], int dst_linesize[4],
uint8_t *src[4], int src_linesize[4],
enum PixelFormat format, int w, int src_h,
int src_field, int interleave, int dst_field)
{
const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[format];
int plane, vsub = desc->log2_chroma_h;
int k = src_field == FIELD_UPPER_AND_LOWER ? 1 : 2;
for (plane = 0; plane < desc->nb_components; plane++) {
int lines = plane == 1 || plane == 2 ? src_h >> vsub : src_h;
int linesize = av_image_get_linesize(format, w, plane);
uint8_t *dstp = dst[plane];
uint8_t *srcp = src[plane];
lines /= k;
if (src_field == FIELD_LOWER)
srcp += src_linesize[plane];
if (interleave && dst_field == FIELD_LOWER)
dstp += dst_linesize[plane];
av_image_copy_plane(dstp, dst_linesize[plane] * (interleave ? 2 : 1),
srcp, src_linesize[plane]*k, linesize, lines);
}
}
static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
{
AVFilterContext *ctx = inlink->dst;
TInterlaceContext *tinterlace = ctx->priv;
if (tinterlace->cur)
avfilter_unref_buffer(tinterlace->cur);
tinterlace->cur = tinterlace->next;
tinterlace->next = picref;
}
static void end_frame(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
TInterlaceContext *tinterlace = ctx->priv;
AVFilterBufferRef *cur = tinterlace->cur;
AVFilterBufferRef *next = tinterlace->next;
AVFilterBufferRef *out = NULL;
int field;
/* we need at least two frames */
if (!tinterlace->cur)
return;
switch (tinterlace->mode) {
case 0: /* move the odd frame into the upper field of the new image, even into
* the lower field, generating a double-height video at half framerate */
out = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
avfilter_copy_buffer_ref_props(out, cur);
out->video->h = outlink->h;
out->video->interlaced = 1;
out->video->top_field_first = 1;
/* write odd frame lines into the upper field of the new frame */
copy_picture_field(out->data, out->linesize,
cur->data, cur->linesize,
inlink->format, inlink->w, inlink->h,
FIELD_UPPER_AND_LOWER, 1, FIELD_UPPER);
/* write even frame lines into the lower field of the new frame */
copy_picture_field(out->data, out->linesize,
next->data, next->linesize,
inlink->format, inlink->w, inlink->h,
FIELD_UPPER_AND_LOWER, 1, FIELD_LOWER);
avfilter_unref_buffer(tinterlace->next);
tinterlace->next = NULL;
break;
case 1: /* only output even frames, odd frames are dropped; height unchanged, half framerate */
case 2: /* only output odd frames, even frames are dropped; height unchanged, half framerate */
out = avfilter_ref_buffer(tinterlace->mode == 2 ? cur : next, AV_PERM_READ);
avfilter_unref_buffer(tinterlace->next);
tinterlace->next = NULL;
break;
case 3: /* expand each frame to double height, but pad alternate
* lines with black; framerate unchanged */
out = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
avfilter_copy_buffer_ref_props(out, cur);
out->video->h = outlink->h;
field = (1 + tinterlace->frame) & 1 ? FIELD_UPPER : FIELD_LOWER;
/* copy upper and lower fields */
copy_picture_field(out->data, out->linesize,
cur->data, cur->linesize,
inlink->format, inlink->w, inlink->h,
FIELD_UPPER_AND_LOWER, 1, field);
/* pad with black the other field */
copy_picture_field(out->data, out->linesize,
tinterlace->black_data, tinterlace->black_linesize,
inlink->format, inlink->w, inlink->h,
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 */
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;
/* copy upper 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 */
copy_picture_field(out->data, out->linesize,
next->data, next->linesize,
inlink->format, inlink->w, inlink->h,
FIELD_LOWER, 1, FIELD_LOWER);
avfilter_unref_buffer(tinterlace->next);
tinterlace->next = NULL;
break;
}
avfilter_start_frame(outlink, out);
avfilter_draw_slice(outlink, 0, outlink->h, 1);
avfilter_end_frame(outlink);
tinterlace->frame++;
}
static int poll_frame(AVFilterLink *outlink)
{
TInterlaceContext *tinterlace = outlink->src->priv;
AVFilterLink *inlink = outlink->src->inputs[0];
int ret, val;
val = avfilter_poll_frame(inlink);
if (val == 1 && !tinterlace->next) {
if ((ret = avfilter_request_frame(inlink)) < 0)
return ret;
val = avfilter_poll_frame(inlink);
}
assert(tinterlace->next);
return val;
}
static int request_frame(AVFilterLink *outlink)
{
TInterlaceContext *tinterlace = outlink->src->priv;
AVFilterLink *inlink = outlink->src->inputs[0];
do {
int ret;
if ((ret = avfilter_request_frame(inlink)) < 0)
return ret;
} while (!tinterlace->cur);
return 0;
}
static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
AVFilter avfilter_vf_tinterlace = {
.name = "tinterlace",
.description = NULL_IF_CONFIG_SMALL("Perform temporal field interlacing."),
.priv_size = sizeof(TInterlaceContext),
.init = init,
.uninit = uninit,
.query_formats = query_formats,
.inputs = (const AVFilterPad[]) {
{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.start_frame = start_frame,
.draw_slice = null_draw_slice,
.end_frame = end_frame, },
{ .name = NULL}
},
.outputs = (const AVFilterPad[]) {
{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_out_props,
.poll_frame = poll_frame,
.request_frame = request_frame },
{ .name = NULL}
},
};