mirror of
https://git.videolan.org/git/ffmpeg.git
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317 lines
10 KiB
C
317 lines
10 KiB
C
/*
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* Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/**
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* @file
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* Motion Compensation Deinterlacer
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* Ported from MPlayer libmpcodecs/vf_mcdeint.c.
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*
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* Known Issues:
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*
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* The motion estimation is somewhat at the mercy of the input, if the
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* input frames are created purely based on spatial interpolation then
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* for example a thin black line or another random and not
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* interpolateable pattern will cause problems.
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* Note: completely ignoring the "unavailable" lines during motion
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* estimation did not look any better, so the most obvious solution
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* would be to improve tfields or penalize problematic motion vectors.
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*
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* If non iterative ME is used then snow currently ignores the OBMC
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* window and as a result sometimes creates artifacts.
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*
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* Only past frames are used, we should ideally use future frames too,
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* something like filtering the whole movie in forward and then
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* backward direction seems like an interesting idea but the current
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* filter framework is FAR from supporting such things.
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*
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* Combining the motion compensated image with the input image also is
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* not as trivial as it seems, simple blindly taking even lines from
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* one and odd ones from the other does not work at all as ME/MC
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* sometimes has nothing in the previous frames which matches the
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* current. The current algorithm has been found by trial and error
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* and almost certainly can be improved...
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*/
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "libavcodec/avcodec.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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enum MCDeintMode {
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MODE_FAST = 0,
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MODE_MEDIUM,
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MODE_SLOW,
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MODE_EXTRA_SLOW,
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MODE_NB,
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};
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enum MCDeintParity {
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PARITY_TFF = 0, ///< top field first
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PARITY_BFF = 1, ///< bottom field first
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};
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typedef struct {
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const AVClass *class;
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int mode; ///< MCDeintMode
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int parity; ///< MCDeintParity
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int qp;
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AVCodecContext *enc_ctx;
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} MCDeintContext;
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#define OFFSET(x) offsetof(MCDeintContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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#define CONST(name, help, val, unit) { name, help, 0, AV_OPT_TYPE_CONST, {.i64=val}, INT_MIN, INT_MAX, FLAGS, unit }
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static const AVOption mcdeint_options[] = {
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{ "mode", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_FAST}, 0, MODE_NB-1, FLAGS, .unit="mode" },
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CONST("fast", NULL, MODE_FAST, "mode"),
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CONST("medium", NULL, MODE_MEDIUM, "mode"),
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CONST("slow", NULL, MODE_SLOW, "mode"),
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CONST("extra_slow", NULL, MODE_EXTRA_SLOW, "mode"),
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{ "parity", "set the assumed picture field parity", OFFSET(parity), AV_OPT_TYPE_INT, {.i64=PARITY_BFF}, -1, 1, FLAGS, "parity" },
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CONST("tff", "assume top field first", PARITY_TFF, "parity"),
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CONST("bff", "assume bottom field first", PARITY_BFF, "parity"),
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{ "qp", "set qp", OFFSET(qp), AV_OPT_TYPE_INT, {.i64=1}, INT_MIN, INT_MAX, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(mcdeint);
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static int config_props(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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MCDeintContext *mcdeint = ctx->priv;
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AVCodec *enc;
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AVCodecContext *enc_ctx;
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AVDictionary *opts = NULL;
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int ret;
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if (!(enc = avcodec_find_encoder(AV_CODEC_ID_SNOW))) {
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av_log(ctx, AV_LOG_ERROR, "Snow encoder is not enabled in libavcodec\n");
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return AVERROR(EINVAL);
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}
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mcdeint->enc_ctx = avcodec_alloc_context3(enc);
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if (!mcdeint->enc_ctx)
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return AVERROR(ENOMEM);
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enc_ctx = mcdeint->enc_ctx;
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enc_ctx->width = inlink->w;
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enc_ctx->height = inlink->h;
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enc_ctx->time_base = (AVRational){1,25}; // meaningless
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enc_ctx->gop_size = INT_MAX;
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enc_ctx->max_b_frames = 0;
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enc_ctx->pix_fmt = AV_PIX_FMT_YUV420P;
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enc_ctx->flags = AV_CODEC_FLAG_QSCALE | AV_CODEC_FLAG_LOW_DELAY;
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enc_ctx->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL;
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enc_ctx->global_quality = 1;
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enc_ctx->me_cmp = enc_ctx->me_sub_cmp = FF_CMP_SAD;
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enc_ctx->mb_cmp = FF_CMP_SSE;
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av_dict_set(&opts, "memc_only", "1", 0);
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av_dict_set(&opts, "no_bitstream", "1", 0);
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switch (mcdeint->mode) {
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case MODE_EXTRA_SLOW:
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enc_ctx->refs = 3;
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case MODE_SLOW:
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enc_ctx->me_method = ME_ITER;
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case MODE_MEDIUM:
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enc_ctx->flags |= AV_CODEC_FLAG_4MV;
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enc_ctx->dia_size = 2;
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case MODE_FAST:
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enc_ctx->flags |= AV_CODEC_FLAG_QPEL;
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}
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ret = avcodec_open2(enc_ctx, enc, &opts);
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av_dict_free(&opts);
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if (ret < 0)
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return ret;
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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MCDeintContext *mcdeint = ctx->priv;
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if (mcdeint->enc_ctx) {
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avcodec_close(mcdeint->enc_ctx);
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av_freep(&mcdeint->enc_ctx);
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}
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}
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE
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};
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AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
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if (!fmts_list)
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return AVERROR(ENOMEM);
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return ff_set_common_formats(ctx, fmts_list);
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *inpic)
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{
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MCDeintContext *mcdeint = inlink->dst->priv;
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AVFilterLink *outlink = inlink->dst->outputs[0];
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AVFrame *outpic, *frame_dec;
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AVPacket pkt = {0};
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int x, y, i, ret, got_frame = 0;
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outpic = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!outpic) {
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av_frame_free(&inpic);
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return AVERROR(ENOMEM);
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}
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av_frame_copy_props(outpic, inpic);
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inpic->quality = mcdeint->qp * FF_QP2LAMBDA;
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av_init_packet(&pkt);
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ret = avcodec_encode_video2(mcdeint->enc_ctx, &pkt, inpic, &got_frame);
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if (ret < 0)
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goto end;
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frame_dec = mcdeint->enc_ctx->coded_frame;
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for (i = 0; i < 3; i++) {
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int is_chroma = !!i;
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int w = AV_CEIL_RSHIFT(inlink->w, is_chroma);
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int h = AV_CEIL_RSHIFT(inlink->h, is_chroma);
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int fils = frame_dec->linesize[i];
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int srcs = inpic ->linesize[i];
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int dsts = outpic ->linesize[i];
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for (y = 0; y < h; y++) {
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if ((y ^ mcdeint->parity) & 1) {
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for (x = 0; x < w; x++) {
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uint8_t *filp = &frame_dec->data[i][x + y*fils];
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uint8_t *srcp = &inpic ->data[i][x + y*srcs];
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uint8_t *dstp = &outpic ->data[i][x + y*dsts];
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if (y > 0 && y < h-1){
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int is_edge = x < 3 || x > w-4;
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int diff0 = filp[-fils] - srcp[-srcs];
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int diff1 = filp[+fils] - srcp[+srcs];
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int temp = filp[0];
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#define DELTA(j) av_clip(j, -x, w-1-x)
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#define GET_SCORE_EDGE(j)\
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FFABS(srcp[-srcs+DELTA(-1+(j))] - srcp[+srcs+DELTA(-1-(j))])+\
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FFABS(srcp[-srcs+DELTA(j) ] - srcp[+srcs+DELTA( -(j))])+\
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FFABS(srcp[-srcs+DELTA(1+(j)) ] - srcp[+srcs+DELTA( 1-(j))])
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#define GET_SCORE(j)\
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FFABS(srcp[-srcs-1+(j)] - srcp[+srcs-1-(j)])+\
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FFABS(srcp[-srcs +(j)] - srcp[+srcs -(j)])+\
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FFABS(srcp[-srcs+1+(j)] - srcp[+srcs+1-(j)])
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#define CHECK_EDGE(j)\
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{ int score = GET_SCORE_EDGE(j);\
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if (score < spatial_score){\
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spatial_score = score;\
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diff0 = filp[-fils+DELTA(j)] - srcp[-srcs+DELTA(j)];\
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diff1 = filp[+fils+DELTA(-(j))] - srcp[+srcs+DELTA(-(j))];\
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#define CHECK(j)\
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{ int score = GET_SCORE(j);\
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if (score < spatial_score){\
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spatial_score= score;\
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diff0 = filp[-fils+(j)] - srcp[-srcs+(j)];\
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diff1 = filp[+fils-(j)] - srcp[+srcs-(j)];\
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if (is_edge) {
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int spatial_score = GET_SCORE_EDGE(0) - 1;
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CHECK_EDGE(-1) CHECK_EDGE(-2) }} }}
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CHECK_EDGE( 1) CHECK_EDGE( 2) }} }}
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} else {
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int spatial_score = GET_SCORE(0) - 1;
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CHECK(-1) CHECK(-2) }} }}
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CHECK( 1) CHECK( 2) }} }}
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}
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if (diff0 + diff1 > 0)
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temp -= (diff0 + diff1 - FFABS(FFABS(diff0) - FFABS(diff1)) / 2) / 2;
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else
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temp -= (diff0 + diff1 + FFABS(FFABS(diff0) - FFABS(diff1)) / 2) / 2;
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*filp = *dstp = temp > 255U ? ~(temp>>31) : temp;
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} else {
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*dstp = *filp;
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}
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}
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}
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}
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for (y = 0; y < h; y++) {
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if (!((y ^ mcdeint->parity) & 1)) {
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for (x = 0; x < w; x++) {
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frame_dec->data[i][x + y*fils] =
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outpic ->data[i][x + y*dsts] = inpic->data[i][x + y*srcs];
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}
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}
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}
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}
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mcdeint->parity ^= 1;
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end:
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av_packet_unref(&pkt);
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av_frame_free(&inpic);
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if (ret < 0) {
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av_frame_free(&outpic);
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return ret;
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}
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return ff_filter_frame(outlink, outpic);
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}
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static const AVFilterPad mcdeint_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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.config_props = config_props,
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},
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{ NULL }
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};
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static const AVFilterPad mcdeint_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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AVFilter ff_vf_mcdeint = {
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.name = "mcdeint",
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.description = NULL_IF_CONFIG_SMALL("Apply motion compensating deinterlacing."),
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.priv_size = sizeof(MCDeintContext),
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.uninit = uninit,
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.query_formats = query_formats,
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.inputs = mcdeint_inputs,
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.outputs = mcdeint_outputs,
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.priv_class = &mcdeint_class,
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};
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