From e89182fc9452f93cfe4fdc02470ac6cab6f74ea8 Mon Sep 17 00:00:00 2001 From: Stefano Sabatini Date: Tue, 28 May 2013 13:40:39 +0200 Subject: lavfi: port mcdeint filter from libmpcodecs --- libavfilter/vf_mcdeint.c | 313 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 313 insertions(+) create mode 100644 libavfilter/vf_mcdeint.c (limited to 'libavfilter/vf_mcdeint.c') diff --git a/libavfilter/vf_mcdeint.c b/libavfilter/vf_mcdeint.c new file mode 100644 index 0000000000..99030364a7 --- /dev/null +++ b/libavfilter/vf_mcdeint.c @@ -0,0 +1,313 @@ +/* + * Copyright (c) 2006 Michael Niedermayer + * + * 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; + enum MCDeintMode mode; + enum MCDeintParity parity; + 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 = 300; + enc_ctx->max_b_frames = 0; + enc_ctx->pix_fmt = AV_PIX_FMT_YUV420P; + enc_ctx->flags = 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); + + 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 |= CODEC_FLAG_4MV; + enc_ctx->dia_size = 2; + case MODE_FAST: + enc_ctx->flags |= 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 PixelFormat pix_fmts[] = { + AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE + }; + + ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); + + return 0; +} + +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; + 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); + pkt.data = NULL; // packet data will be allocated by the encoder + pkt.size = 0; + + 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 = FF_CEIL_RSHIFT(inlink->w, is_chroma); + int h = FF_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_free_packet(&pkt); + av_frame_free(&inpic); + if (ret < 0) + 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 avfilter_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, +}; -- cgit v1.2.3