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/*
* 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
*/
|
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#include "libavutil/opt.h" |
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#include "libavutil/imgutils.h" |
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#include "libavutil/avassert.h" |
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#include "avfilter.h"
#include "internal.h"
|
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enum TInterlaceMode {
MODE_MERGE = 0,
MODE_DROP_EVEN,
MODE_DROP_ODD,
MODE_PAD,
MODE_INTERLEAVE_TOP,
MODE_INTERLEAVE_BOTTOM,
MODE_INTERLACEX2, |
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MODE_NB, |
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};
|
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typedef struct { |
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const AVClass *class; |
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enum TInterlaceMode mode; ///< interlace mode selected |
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int flags; ///< flags affecting interlacing algorithm |
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int frame; ///< number of the output frame
int vsub; ///< chroma vertical subsampling |
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AVFrame *cur;
AVFrame *next; |
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uint8_t *black_data[4]; ///< buffer used to fill padded lines
int black_linesize[4];
} TInterlaceContext;
|
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#define OFFSET(x) offsetof(TInterlaceContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
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#define TINTERLACE_FLAG_VLPF 01 |
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static const AVOption tinterlace_options[] = {
{"mode", "select interlace mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_MERGE}, 0, MODE_NB-1, FLAGS, "mode"},
{"merge", "merge fields", 0, AV_OPT_TYPE_CONST, {.i64=MODE_MERGE}, INT_MIN, INT_MAX, FLAGS, "mode"},
{"drop_even", "drop even fields", 0, AV_OPT_TYPE_CONST, {.i64=MODE_DROP_EVEN}, INT_MIN, INT_MAX, FLAGS, "mode"},
{"drop_odd", "drop odd fields", 0, AV_OPT_TYPE_CONST, {.i64=MODE_DROP_ODD}, INT_MIN, INT_MAX, FLAGS, "mode"},
{"pad", "pad alternate lines with black", 0, AV_OPT_TYPE_CONST, {.i64=MODE_PAD}, INT_MIN, INT_MAX, FLAGS, "mode"},
{"interleave_top", "interleave top and bottom fields", 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE_TOP}, INT_MIN, INT_MAX, FLAGS, "mode"},
{"interleave_bottom", "interleave bottom and top fields", 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE_BOTTOM}, INT_MIN, INT_MAX, FLAGS, "mode"},
{"interlacex2", "interlace fields from two consecutive frames", 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLACEX2}, INT_MIN, INT_MAX, FLAGS, "mode"},
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{"flags", "set flags", OFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, INT_MAX, 0, "flags" },
{"low_pass_filter", "enable vertical low-pass filter", 0, AV_OPT_TYPE_CONST, {.i64 = TINTERLACE_FLAG_VLPF}, INT_MIN, INT_MAX, FLAGS, "flags" },
{"vlpf", "enable vertical low-pass filter", 0, AV_OPT_TYPE_CONST, {.i64 = TINTERLACE_FLAG_VLPF}, INT_MIN, INT_MAX, FLAGS, "flags" },
|
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{NULL}
};
AVFILTER_DEFINE_CLASS(tinterlace);
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#define FULL_SCALE_YUVJ_FORMATS \ |
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AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P |
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|
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static enum AVPixelFormat full_scale_yuvj_pix_fmts[] = {
FULL_SCALE_YUVJ_FORMATS, AV_PIX_FMT_NONE |
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};
static int query_formats(AVFilterContext *ctx)
{ |
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static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P,
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUVA420P,
AV_PIX_FMT_GRAY8, FULL_SCALE_YUVJ_FORMATS,
AV_PIX_FMT_NONE |
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};
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); |
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return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
TInterlaceContext *tinterlace = ctx->priv;
|
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av_frame_free(&tinterlace->cur );
av_frame_free(&tinterlace->next); |
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av_freep(&tinterlace->black_data[0]);
}
static int config_out_props(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
AVFilterLink *inlink = outlink->src->inputs[0]; |
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format); |
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TInterlaceContext *tinterlace = ctx->priv;
tinterlace->vsub = desc->log2_chroma_h; |
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outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP; |
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outlink->w = inlink->w; |
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outlink->h = tinterlace->mode == MODE_MERGE || tinterlace->mode == MODE_PAD ? |
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inlink->h*2 : inlink->h;
|
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if (tinterlace->mode == MODE_PAD) { |
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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++) { |
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int h = i == 1 || i == 2 ? FF_CEIL_RSHIFT(outlink->h, desc->log2_chroma_h) : outlink->h; |
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memset(tinterlace->black_data[i], black[i],
tinterlace->black_linesize[i] * h);
}
} |
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if ((tinterlace->flags & TINTERLACE_FLAG_VLPF)
&& !(tinterlace->mode == MODE_INTERLEAVE_TOP
|| tinterlace->mode == MODE_INTERLEAVE_BOTTOM)) {
av_log(ctx, AV_LOG_WARNING, "low_pass_filter flag ignored with mode %d\n",
tinterlace->mode); |
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tinterlace->flags &= ~TINTERLACE_FLAG_VLPF; |
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}
av_log(ctx, AV_LOG_VERBOSE, "mode:%d filter:%s h:%d -> h:%d\n",
tinterlace->mode, (tinterlace->flags & TINTERLACE_FLAG_VLPF) ? "on" : "off",
inlink->h, outlink->h); |
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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 |
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* @param interleave leave a padding line between each copied line |
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* @param dst_field copy to upper or lower field,
* only meaningful when interleave is selected |
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* @param flags context flags |
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*/
static inline
void copy_picture_field(uint8_t *dst[4], int dst_linesize[4], |
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const uint8_t *src[4], int src_linesize[4], |
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enum AVPixelFormat format, int w, int src_h, |
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int src_field, int interleave, int dst_field,
int flags) |
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{ |
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(format); |
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int plane, vsub = desc->log2_chroma_h;
int k = src_field == FIELD_UPPER_AND_LOWER ? 1 : 2; |
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int h, i; |
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for (plane = 0; plane < desc->nb_components; plane++) { |
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int lines = plane == 1 || plane == 2 ? FF_CEIL_RSHIFT(src_h, vsub) : src_h; |
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int linesize = av_image_get_linesize(format, w, plane);
uint8_t *dstp = dst[plane]; |
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const uint8_t *srcp = src[plane]; |
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if (linesize < 0)
return;
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lines = (lines + (src_field == FIELD_UPPER)) / k; |
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if (src_field == FIELD_LOWER)
srcp += src_linesize[plane];
if (interleave && dst_field == FIELD_LOWER)
dstp += dst_linesize[plane]; |
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if (flags & TINTERLACE_FLAG_VLPF) {
// Low-pass filtering is required when creating an interlaced destination from
// a progressive source which contains high-frequency vertical detail.
// Filtering will reduce interlace 'twitter' and Moire patterning.
int srcp_linesize = src_linesize[plane] * k;
int dstp_linesize = dst_linesize[plane] * (interleave ? 2 : 1); |
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for (h = lines; h > 0; h--) { |
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const uint8_t *srcp_above = srcp - src_linesize[plane];
const uint8_t *srcp_below = srcp + src_linesize[plane];
if (h == lines) srcp_above = srcp; // there is no line above
if (h == 1) 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. */
dstp[i] = (1 + srcp[i] + srcp[i] + srcp_above[i] + srcp_below[i]) >> 2;
}
dstp += dstp_linesize;
srcp += srcp_linesize;
}
} else {
av_image_copy_plane(dstp, dst_linesize[plane] * (interleave ? 2 : 1), |
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srcp, src_linesize[plane]*k, linesize, lines); |
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} |
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}
}
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static int filter_frame(AVFilterLink *inlink, AVFrame *picref) |
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{
AVFilterContext *ctx = inlink->dst; |
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AVFilterLink *outlink = ctx->outputs[0]; |
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TInterlaceContext *tinterlace = ctx->priv; |
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AVFrame *cur, *next, *out; |
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int field, tff, ret; |
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|
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av_frame_free(&tinterlace->cur); |
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tinterlace->cur = tinterlace->next;
tinterlace->next = picref;
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cur = tinterlace->cur;
next = tinterlace->next; |
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/* we need at least two frames */
if (!tinterlace->cur) |
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return 0; |
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switch (tinterlace->mode) { |
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case MODE_MERGE: /* move the odd frame into the upper field of the new image, even into |
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* the lower field, generating a double-height video at half framerate */ |
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
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if (!out)
return AVERROR(ENOMEM); |
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av_frame_copy_props(out, cur);
out->height = outlink->h;
out->interlaced_frame = 1;
out->top_field_first = 1; |
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/* write odd frame lines into the upper field of the new frame */
copy_picture_field(out->data, out->linesize, |
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(const uint8_t **)cur->data, cur->linesize, |
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inlink->format, inlink->w, inlink->h, |
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FIELD_UPPER_AND_LOWER, 1, FIELD_UPPER, tinterlace->flags); |
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/* write even frame lines into the lower field of the new frame */
copy_picture_field(out->data, out->linesize, |
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(const uint8_t **)next->data, next->linesize, |
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inlink->format, inlink->w, inlink->h, |
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FIELD_UPPER_AND_LOWER, 1, FIELD_LOWER, tinterlace->flags); |
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av_frame_free(&tinterlace->next); |
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break;
|
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case MODE_DROP_ODD: /* only output even frames, odd frames are dropped; height unchanged, half framerate */
case MODE_DROP_EVEN: /* only output odd frames, even frames are dropped; height unchanged, half framerate */ |
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out = av_frame_clone(tinterlace->mode == MODE_DROP_EVEN ? cur : next);
av_frame_free(&tinterlace->next); |
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break;
|
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case MODE_PAD: /* expand each frame to double height, but pad alternate
* lines with black; framerate unchanged */ |
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
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if (!out)
return AVERROR(ENOMEM); |
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av_frame_copy_props(out, cur);
out->height = outlink->h; |
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field = (1 + tinterlace->frame) & 1 ? FIELD_UPPER : FIELD_LOWER;
/* copy upper and lower fields */
copy_picture_field(out->data, out->linesize, |
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(const uint8_t **)cur->data, cur->linesize, |
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inlink->format, inlink->w, inlink->h, |
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FIELD_UPPER_AND_LOWER, 1, field, tinterlace->flags); |
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/* pad with black the other field */
copy_picture_field(out->data, out->linesize, |
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(const uint8_t **)tinterlace->black_data, tinterlace->black_linesize, |
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inlink->format, inlink->w, inlink->h, |
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FIELD_UPPER_AND_LOWER, 1, !field, tinterlace->flags); |
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break;
|
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/* interleave upper/lower lines from odd frames with lower/upper lines from even frames,
* halving the frame rate and preserving image height */ |
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case MODE_INTERLEAVE_TOP: /* top field first */
case MODE_INTERLEAVE_BOTTOM: /* bottom field first */
tff = tinterlace->mode == MODE_INTERLEAVE_TOP; |
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
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if (!out)
return AVERROR(ENOMEM); |
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av_frame_copy_props(out, cur);
out->interlaced_frame = 1;
out->top_field_first = tff; |
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|
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/* copy upper/lower field from cur */ |
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copy_picture_field(out->data, out->linesize, |
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(const uint8_t **)cur->data, cur->linesize, |
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inlink->format, inlink->w, inlink->h, |
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tff ? FIELD_UPPER : FIELD_LOWER, 1, tff ? FIELD_UPPER : FIELD_LOWER,
tinterlace->flags); |
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/* copy lower/upper field from next */ |
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copy_picture_field(out->data, out->linesize, |
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(const uint8_t **)next->data, next->linesize, |
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inlink->format, inlink->w, inlink->h, |
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tff ? FIELD_LOWER : FIELD_UPPER, 1, tff ? FIELD_LOWER : FIELD_UPPER,
tinterlace->flags); |
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av_frame_free(&tinterlace->next); |
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break; |
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case MODE_INTERLACEX2: /* re-interlace preserving image height, double frame rate */ |
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/* output current frame first */ |
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out = av_frame_clone(cur); |
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if (!out)
return AVERROR(ENOMEM); |
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out->interlaced_frame = 1; |
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|
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if ((ret = ff_filter_frame(outlink, out)) < 0)
return ret; |
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/* output mix of current and next frame */ |
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tff = next->top_field_first;
out = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
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if (!out)
return AVERROR(ENOMEM); |
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av_frame_copy_props(out, next);
out->interlaced_frame = 1; |
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/* write current frame second field lines into the second field of the new frame */
copy_picture_field(out->data, out->linesize, |
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(const uint8_t **)cur->data, cur->linesize, |
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inlink->format, inlink->w, inlink->h, |
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tff ? FIELD_LOWER : FIELD_UPPER, 1, tff ? FIELD_LOWER : FIELD_UPPER,
tinterlace->flags); |
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/* write next frame first field lines into the first field of the new frame */
copy_picture_field(out->data, out->linesize, |
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(const uint8_t **)next->data, next->linesize, |
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inlink->format, inlink->w, inlink->h, |
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tff ? FIELD_UPPER : FIELD_LOWER, 1, tff ? FIELD_UPPER : FIELD_LOWER,
tinterlace->flags); |
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break; |
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default:
av_assert0(0); |
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}
|
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ret = ff_filter_frame(outlink, out); |
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tinterlace->frame++; |
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|
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return ret; |
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}
|
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static const AVFilterPad tinterlace_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO, |
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.filter_frame = filter_frame, |
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},
{ NULL }
};
static const AVFilterPad tinterlace_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_out_props,
},
{ NULL }
};
|
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AVFilter avfilter_vf_tinterlace = {
.name = "tinterlace",
.description = NULL_IF_CONFIG_SMALL("Perform temporal field interlacing."),
.priv_size = sizeof(TInterlaceContext),
.uninit = uninit,
.query_formats = query_formats, |
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.inputs = tinterlace_inputs,
.outputs = tinterlace_outputs, |
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.priv_class = &tinterlace_class, |
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}; |