diff options
Diffstat (limited to 'libavfilter/vf_mpdecimate.c')
| -rw-r--r-- | libavfilter/vf_mpdecimate.c | 261 |
1 files changed, 261 insertions, 0 deletions
diff --git a/libavfilter/vf_mpdecimate.c b/libavfilter/vf_mpdecimate.c new file mode 100644 index 0000000..c667a9f --- /dev/null +++ b/libavfilter/vf_mpdecimate.c @@ -0,0 +1,261 @@ +/* + * Copyright (c) 2003 Rich Felker + * Copyright (c) 2012 Stefano Sabatini + * + * 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 mpdecimate filter, ported from libmpcodecs/vf_decimate.c by + * Rich Felker. + */ + +#include "libavutil/opt.h" +#include "libavutil/pixdesc.h" +#include "libavutil/timestamp.h" +#include "libavcodec/dsputil.h" +#include "libavcodec/pixblockdsp.h" +#include "avfilter.h" +#include "internal.h" +#include "formats.h" +#include "video.h" + +typedef struct { + const AVClass *class; + int lo, hi; ///< lower and higher threshold number of differences + ///< values for 8x8 blocks + + float frac; ///< threshold of changed pixels over the total fraction + + int max_drop_count; ///< if positive: maximum number of sequential frames to drop + ///< if negative: minimum number of frames between two drops + + int drop_count; ///< if positive: number of frames sequentially dropped + ///< if negative: number of sequential frames which were not dropped + + int hsub, vsub; ///< chroma subsampling values + AVFrame *ref; ///< reference picture + DSPContext dspctx; ///< context providing optimized diff routines + PixblockDSPContext pdsp; + AVCodecContext *avctx; ///< codec context required for the DSPContext +} DecimateContext; + +#define OFFSET(x) offsetof(DecimateContext, x) +#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM + +static const AVOption mpdecimate_options[] = { + { "max", "set the maximum number of consecutive dropped frames (positive), or the minimum interval between dropped frames (negative)", + OFFSET(max_drop_count), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, FLAGS }, + { "hi", "set high dropping threshold", OFFSET(hi), AV_OPT_TYPE_INT, {.i64=64*12}, INT_MIN, INT_MAX, FLAGS }, + { "lo", "set low dropping threshold", OFFSET(lo), AV_OPT_TYPE_INT, {.i64=64*5}, INT_MIN, INT_MAX, FLAGS }, + { "frac", "set fraction dropping threshold", OFFSET(frac), AV_OPT_TYPE_FLOAT, {.dbl=0.33}, 0, 1, FLAGS }, + { NULL } +}; + +AVFILTER_DEFINE_CLASS(mpdecimate); + +/** + * Return 1 if the two planes are different, 0 otherwise. + */ +static int diff_planes(AVFilterContext *ctx, + uint8_t *cur, uint8_t *ref, int linesize, + int w, int h) +{ + DecimateContext *decimate = ctx->priv; + DSPContext *dspctx = &decimate->dspctx; + PixblockDSPContext *pdsp = &decimate->pdsp; + + int x, y; + int d, c = 0; + int t = (w/16)*(h/16)*decimate->frac; + int16_t block[8*8]; + + /* compute difference for blocks of 8x8 bytes */ + for (y = 0; y < h-7; y += 4) { + for (x = 8; x < w-7; x += 4) { + pdsp->diff_pixels(block, + cur+x+y*linesize, + ref+x+y*linesize, linesize); + d = dspctx->sum_abs_dctelem(block); + if (d > decimate->hi) + return 1; + if (d > decimate->lo) { + c++; + if (c > t) + return 1; + } + } + } + return 0; +} + +/** + * Tell if the frame should be decimated, for example if it is no much + * different with respect to the reference frame ref. + */ +static int decimate_frame(AVFilterContext *ctx, + AVFrame *cur, AVFrame *ref) +{ + DecimateContext *decimate = ctx->priv; + int plane; + + if (decimate->max_drop_count > 0 && + decimate->drop_count >= decimate->max_drop_count) + return 0; + if (decimate->max_drop_count < 0 && + (decimate->drop_count-1) > decimate->max_drop_count) + return 0; + + for (plane = 0; ref->data[plane] && ref->linesize[plane]; plane++) { + int vsub = plane == 1 || plane == 2 ? decimate->vsub : 0; + int hsub = plane == 1 || plane == 2 ? decimate->hsub : 0; + if (diff_planes(ctx, + cur->data[plane], ref->data[plane], ref->linesize[plane], + FF_CEIL_RSHIFT(ref->width, hsub), + FF_CEIL_RSHIFT(ref->height, vsub))) + return 0; + } + + return 1; +} + +static av_cold int init(AVFilterContext *ctx) +{ + DecimateContext *decimate = ctx->priv; + + av_log(ctx, AV_LOG_VERBOSE, "max_drop_count:%d hi:%d lo:%d frac:%f\n", + decimate->max_drop_count, decimate->hi, decimate->lo, decimate->frac); + + decimate->avctx = avcodec_alloc_context3(NULL); + if (!decimate->avctx) + return AVERROR(ENOMEM); + avpriv_dsputil_init(&decimate->dspctx, decimate->avctx); + ff_pixblockdsp_init(&decimate->pdsp, decimate->avctx); + + return 0; +} + +static av_cold void uninit(AVFilterContext *ctx) +{ + DecimateContext *decimate = ctx->priv; + av_frame_free(&decimate->ref); + if (decimate->avctx) { + avcodec_close(decimate->avctx); + av_freep(&decimate->avctx); + } +} + +static int query_formats(AVFilterContext *ctx) +{ + static const enum AVPixelFormat pix_fmts[] = { + AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, + AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, + AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P, + AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, + AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ440P, + AV_PIX_FMT_YUVA420P, + AV_PIX_FMT_NONE + }; + + ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); + + return 0; +} + +static int config_input(AVFilterLink *inlink) +{ + AVFilterContext *ctx = inlink->dst; + DecimateContext *decimate = ctx->priv; + const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format); + decimate->hsub = pix_desc->log2_chroma_w; + decimate->vsub = pix_desc->log2_chroma_h; + + return 0; +} + +static int filter_frame(AVFilterLink *inlink, AVFrame *cur) +{ + DecimateContext *decimate = inlink->dst->priv; + AVFilterLink *outlink = inlink->dst->outputs[0]; + int ret; + + if (decimate->ref && decimate_frame(inlink->dst, cur, decimate->ref)) { + decimate->drop_count = FFMAX(1, decimate->drop_count+1); + } else { + av_frame_free(&decimate->ref); + decimate->ref = cur; + decimate->drop_count = FFMIN(-1, decimate->drop_count-1); + + if (ret = ff_filter_frame(outlink, av_frame_clone(cur)) < 0) + return ret; + } + + av_log(inlink->dst, AV_LOG_DEBUG, + "%s pts:%s pts_time:%s drop_count:%d\n", + decimate->drop_count > 0 ? "drop" : "keep", + av_ts2str(cur->pts), av_ts2timestr(cur->pts, &inlink->time_base), + decimate->drop_count); + + if (decimate->drop_count > 0) + av_frame_free(&cur); + + return 0; +} + +static int request_frame(AVFilterLink *outlink) +{ + DecimateContext *decimate = outlink->src->priv; + AVFilterLink *inlink = outlink->src->inputs[0]; + int ret; + + do { + ret = ff_request_frame(inlink); + } while (decimate->drop_count > 0 && ret >= 0); + + return ret; +} + +static const AVFilterPad mpdecimate_inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .config_props = config_input, + .filter_frame = filter_frame, + }, + { NULL } +}; + +static const AVFilterPad mpdecimate_outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .request_frame = request_frame, + }, + { NULL } +}; + +AVFilter ff_vf_mpdecimate = { + .name = "mpdecimate", + .description = NULL_IF_CONFIG_SMALL("Remove near-duplicate frames."), + .init = init, + .uninit = uninit, + .priv_size = sizeof(DecimateContext), + .priv_class = &mpdecimate_class, + .query_formats = query_formats, + .inputs = mpdecimate_inputs, + .outputs = mpdecimate_outputs, +}; |
