| /* |
| * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> |
| * |
| * 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 |
| * Motion Compensation Deinterlacer |
| * Ported from MPlayer libmpcodecs/vf_mcdeint.c. |
| * |
| * Known Issues: |
| * |
| * The motion estimation is somewhat at the mercy of the input, if the |
| * input frames are created purely based on spatial interpolation then |
| * for example a thin black line or another random and not |
| * interpolateable pattern will cause problems. |
| * Note: completely ignoring the "unavailable" lines during motion |
| * estimation did not look any better, so the most obvious solution |
| * would be to improve tfields or penalize problematic motion vectors. |
| * |
| * If non iterative ME is used then snow currently ignores the OBMC |
| * window and as a result sometimes creates artifacts. |
| * |
| * Only past frames are used, we should ideally use future frames too, |
| * something like filtering the whole movie in forward and then |
| * backward direction seems like a interesting idea but the current |
| * filter framework is FAR from supporting such things. |
| * |
| * Combining the motion compensated image with the input image also is |
| * not as trivial as it seems, simple blindly taking even lines from |
| * one and odd ones from the other does not work at all as ME/MC |
| * sometimes has nothing in the previous frames which matches the |
| * current. The current algorithm has been found by trial and error |
| * and almost certainly can be improved... |
| */ |
| |
| #include "libavutil/opt.h" |
| #include "libavutil/pixdesc.h" |
| #include "libavcodec/avcodec.h" |
| #include "avfilter.h" |
| #include "formats.h" |
| #include "internal.h" |
| |
| enum MCDeintMode { |
| MODE_FAST = 0, |
| MODE_MEDIUM, |
| MODE_SLOW, |
| MODE_EXTRA_SLOW, |
| MODE_NB, |
| }; |
| |
| enum MCDeintParity { |
| PARITY_TFF = 0, ///< top field first |
| PARITY_BFF = 1, ///< bottom field first |
| }; |
| |
| typedef struct { |
| const AVClass *class; |
| int mode; ///< MCDeintMode |
| int parity; ///< MCDeintParity |
| int qp; |
| AVCodecContext *enc_ctx; |
| } MCDeintContext; |
| |
| #define OFFSET(x) offsetof(MCDeintContext, x) |
| #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
| #define CONST(name, help, val, unit) { name, help, 0, AV_OPT_TYPE_CONST, {.i64=val}, INT_MIN, INT_MAX, FLAGS, unit } |
| |
| static const AVOption mcdeint_options[] = { |
| { "mode", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_FAST}, 0, MODE_NB-1, FLAGS, .unit="mode" }, |
| CONST("fast", NULL, MODE_FAST, "mode"), |
| CONST("medium", NULL, MODE_MEDIUM, "mode"), |
| CONST("slow", NULL, MODE_SLOW, "mode"), |
| CONST("extra_slow", NULL, MODE_EXTRA_SLOW, "mode"), |
| |
| { "parity", "set the assumed picture field parity", OFFSET(parity), AV_OPT_TYPE_INT, {.i64=PARITY_BFF}, -1, 1, FLAGS, "parity" }, |
| CONST("tff", "assume top field first", PARITY_TFF, "parity"), |
| CONST("bff", "assume bottom field first", PARITY_BFF, "parity"), |
| |
| { "qp", "set qp", OFFSET(qp), AV_OPT_TYPE_INT, {.i64=1}, INT_MIN, INT_MAX, FLAGS }, |
| { NULL } |
| }; |
| |
| AVFILTER_DEFINE_CLASS(mcdeint); |
| |
| static int config_props(AVFilterLink *inlink) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| MCDeintContext *mcdeint = ctx->priv; |
| AVCodec *enc; |
| AVCodecContext *enc_ctx; |
| AVDictionary *opts = NULL; |
| int ret; |
| |
| if (!(enc = avcodec_find_encoder(AV_CODEC_ID_SNOW))) { |
| av_log(ctx, AV_LOG_ERROR, "Snow encoder is not enabled in libavcodec\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| mcdeint->enc_ctx = avcodec_alloc_context3(enc); |
| if (!mcdeint->enc_ctx) |
| return AVERROR(ENOMEM); |
| enc_ctx = mcdeint->enc_ctx; |
| enc_ctx->width = inlink->w; |
| enc_ctx->height = inlink->h; |
| enc_ctx->time_base = (AVRational){1,25}; // meaningless |
| enc_ctx->gop_size = INT_MAX; |
| enc_ctx->max_b_frames = 0; |
| enc_ctx->pix_fmt = AV_PIX_FMT_YUV420P; |
| enc_ctx->flags = AV_CODEC_FLAG_QSCALE | CODEC_FLAG_LOW_DELAY; |
| enc_ctx->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL; |
| enc_ctx->global_quality = 1; |
| enc_ctx->me_cmp = enc_ctx->me_sub_cmp = FF_CMP_SAD; |
| enc_ctx->mb_cmp = FF_CMP_SSE; |
| av_dict_set(&opts, "memc_only", "1", 0); |
| av_dict_set(&opts, "no_bitstream", "1", 0); |
| |
| switch (mcdeint->mode) { |
| case MODE_EXTRA_SLOW: |
| enc_ctx->refs = 3; |
| case MODE_SLOW: |
| enc_ctx->me_method = ME_ITER; |
| case MODE_MEDIUM: |
| enc_ctx->flags |= AV_CODEC_FLAG_4MV; |
| enc_ctx->dia_size = 2; |
| case MODE_FAST: |
| enc_ctx->flags |= AV_CODEC_FLAG_QPEL; |
| } |
| |
| ret = avcodec_open2(enc_ctx, enc, &opts); |
| av_dict_free(&opts); |
| if (ret < 0) |
| return ret; |
| |
| return 0; |
| } |
| |
| static av_cold void uninit(AVFilterContext *ctx) |
| { |
| MCDeintContext *mcdeint = ctx->priv; |
| |
| if (mcdeint->enc_ctx) { |
| avcodec_close(mcdeint->enc_ctx); |
| av_freep(&mcdeint->enc_ctx); |
| } |
| } |
| |
| static int query_formats(AVFilterContext *ctx) |
| { |
| static const enum AVPixelFormat pix_fmts[] = { |
| AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE |
| }; |
| AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts); |
| if (!fmts_list) |
| return AVERROR(ENOMEM); |
| return ff_set_common_formats(ctx, fmts_list); |
| } |
| |
| static int filter_frame(AVFilterLink *inlink, AVFrame *inpic) |
| { |
| MCDeintContext *mcdeint = inlink->dst->priv; |
| AVFilterLink *outlink = inlink->dst->outputs[0]; |
| AVFrame *outpic, *frame_dec; |
| AVPacket pkt = {0}; |
| int x, y, i, ret, got_frame = 0; |
| |
| outpic = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
| if (!outpic) { |
| av_frame_free(&inpic); |
| return AVERROR(ENOMEM); |
| } |
| av_frame_copy_props(outpic, inpic); |
| inpic->quality = mcdeint->qp * FF_QP2LAMBDA; |
| |
| av_init_packet(&pkt); |
| |
| ret = avcodec_encode_video2(mcdeint->enc_ctx, &pkt, inpic, &got_frame); |
| if (ret < 0) |
| goto end; |
| |
| frame_dec = mcdeint->enc_ctx->coded_frame; |
| |
| for (i = 0; i < 3; i++) { |
| int is_chroma = !!i; |
| int w = AV_CEIL_RSHIFT(inlink->w, is_chroma); |
| int h = AV_CEIL_RSHIFT(inlink->h, is_chroma); |
| int fils = frame_dec->linesize[i]; |
| int srcs = inpic ->linesize[i]; |
| int dsts = outpic ->linesize[i]; |
| |
| for (y = 0; y < h; y++) { |
| if ((y ^ mcdeint->parity) & 1) { |
| for (x = 0; x < w; x++) { |
| uint8_t *filp = &frame_dec->data[i][x + y*fils]; |
| uint8_t *srcp = &inpic ->data[i][x + y*srcs]; |
| uint8_t *dstp = &outpic ->data[i][x + y*dsts]; |
| |
| if (y > 0 && y < h-1){ |
| int is_edge = x < 3 || x > w-4; |
| int diff0 = filp[-fils] - srcp[-srcs]; |
| int diff1 = filp[+fils] - srcp[+srcs]; |
| int temp = filp[0]; |
| |
| #define DELTA(j) av_clip(j, -x, w-1-x) |
| |
| #define GET_SCORE_EDGE(j)\ |
| FFABS(srcp[-srcs+DELTA(-1+(j))] - srcp[+srcs+DELTA(-1-(j))])+\ |
| FFABS(srcp[-srcs+DELTA(j) ] - srcp[+srcs+DELTA( -(j))])+\ |
| FFABS(srcp[-srcs+DELTA(1+(j)) ] - srcp[+srcs+DELTA( 1-(j))]) |
| |
| #define GET_SCORE(j)\ |
| FFABS(srcp[-srcs-1+(j)] - srcp[+srcs-1-(j)])+\ |
| FFABS(srcp[-srcs +(j)] - srcp[+srcs -(j)])+\ |
| FFABS(srcp[-srcs+1+(j)] - srcp[+srcs+1-(j)]) |
| |
| #define CHECK_EDGE(j)\ |
| { int score = GET_SCORE_EDGE(j);\ |
| if (score < spatial_score){\ |
| spatial_score = score;\ |
| diff0 = filp[-fils+DELTA(j)] - srcp[-srcs+DELTA(j)];\ |
| diff1 = filp[+fils+DELTA(-(j))] - srcp[+srcs+DELTA(-(j))];\ |
| |
| #define CHECK(j)\ |
| { int score = GET_SCORE(j);\ |
| if (score < spatial_score){\ |
| spatial_score= score;\ |
| diff0 = filp[-fils+(j)] - srcp[-srcs+(j)];\ |
| diff1 = filp[+fils-(j)] - srcp[+srcs-(j)];\ |
| |
| if (is_edge) { |
| int spatial_score = GET_SCORE_EDGE(0) - 1; |
| CHECK_EDGE(-1) CHECK_EDGE(-2) }} }} |
| CHECK_EDGE( 1) CHECK_EDGE( 2) }} }} |
| } else { |
| int spatial_score = GET_SCORE(0) - 1; |
| CHECK(-1) CHECK(-2) }} }} |
| CHECK( 1) CHECK( 2) }} }} |
| } |
| |
| |
| if (diff0 + diff1 > 0) |
| temp -= (diff0 + diff1 - FFABS(FFABS(diff0) - FFABS(diff1)) / 2) / 2; |
| else |
| temp -= (diff0 + diff1 + FFABS(FFABS(diff0) - FFABS(diff1)) / 2) / 2; |
| *filp = *dstp = temp > 255U ? ~(temp>>31) : temp; |
| } else { |
| *dstp = *filp; |
| } |
| } |
| } |
| } |
| |
| for (y = 0; y < h; y++) { |
| if (!((y ^ mcdeint->parity) & 1)) { |
| for (x = 0; x < w; x++) { |
| frame_dec->data[i][x + y*fils] = |
| outpic ->data[i][x + y*dsts] = inpic->data[i][x + y*srcs]; |
| } |
| } |
| } |
| } |
| mcdeint->parity ^= 1; |
| |
| end: |
| av_packet_unref(&pkt); |
| av_frame_free(&inpic); |
| if (ret < 0) { |
| av_frame_free(&outpic); |
| return ret; |
| } |
| return ff_filter_frame(outlink, outpic); |
| } |
| |
| static const AVFilterPad mcdeint_inputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .filter_frame = filter_frame, |
| .config_props = config_props, |
| }, |
| { NULL } |
| }; |
| |
| static const AVFilterPad mcdeint_outputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| }, |
| { NULL } |
| }; |
| |
| AVFilter ff_vf_mcdeint = { |
| .name = "mcdeint", |
| .description = NULL_IF_CONFIG_SMALL("Apply motion compensating deinterlacing."), |
| .priv_size = sizeof(MCDeintContext), |
| .uninit = uninit, |
| .query_formats = query_formats, |
| .inputs = mcdeint_inputs, |
| .outputs = mcdeint_outputs, |
| .priv_class = &mcdeint_class, |
| }; |
