diff options
Diffstat (limited to 'libavfilter/vf_decimate.c')
-rw-r--r-- | libavfilter/vf_decimate.c | 258 |
1 files changed, 0 insertions, 258 deletions
diff --git a/libavfilter/vf_decimate.c b/libavfilter/vf_decimate.c deleted file mode 100644 index 963f1d5865..0000000000 --- a/libavfilter/vf_decimate.c +++ /dev/null @@ -1,258 +0,0 @@ -/* - * 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 decimate 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 "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 - 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 decimate_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(decimate); - -/** - * 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; - - 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) { - dspctx->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], - ref->width>>hsub, 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); - dsputil_init(&decimate->dspctx, 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 decimate_inputs[] = { - { - .name = "default", - .type = AVMEDIA_TYPE_VIDEO, - .get_video_buffer = ff_null_get_video_buffer, - .config_props = config_input, - .filter_frame = filter_frame, - }, - { NULL } -}; - -static const AVFilterPad decimate_outputs[] = { - { - .name = "default", - .type = AVMEDIA_TYPE_VIDEO, - .request_frame = request_frame, - }, - { NULL } -}; - -AVFilter avfilter_vf_decimate = { - .name = "decimate", - .description = NULL_IF_CONFIG_SMALL("Remove near-duplicate frames."), - .init = init, - .uninit = uninit, - - .priv_size = sizeof(DecimateContext), - .query_formats = query_formats, - .inputs = decimate_inputs, - .outputs = decimate_outputs, - .priv_class = &decimate_class, -}; |