diff options
Diffstat (limited to 'libavfilter/vf_idet.c')
| -rw-r--r-- | libavfilter/vf_idet.c | 336 |
1 files changed, 336 insertions, 0 deletions
diff --git a/libavfilter/vf_idet.c b/libavfilter/vf_idet.c new file mode 100644 index 0000000000..4d14241bb5 --- /dev/null +++ b/libavfilter/vf_idet.c @@ -0,0 +1,336 @@ +/* + * Copyright (C) 2012 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 Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser 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 + */ + +#include "libavutil/cpu.h" +#include "libavutil/common.h" +#include "libavutil/pixdesc.h" +#include "avfilter.h" +#include "internal.h" + +#undef NDEBUG +#include <assert.h> + +#define HIST_SIZE 4 + +typedef enum { + TFF, + BFF, + PROGRSSIVE, + UNDETERMINED, +} Type; + +typedef struct { + float interlace_threshold; + float progressive_threshold; + + Type last_type; + Type prestat[4]; + Type poststat[4]; + + uint8_t history[HIST_SIZE]; + + AVFilterBufferRef *cur; + AVFilterBufferRef *next; + AVFilterBufferRef *prev; + AVFilterBufferRef *out; + int (*filter_line)(const uint8_t *prev, const uint8_t *cur, const uint8_t *next, int w); + + const AVPixFmtDescriptor *csp; +} IDETContext; + +static const char *type2str(Type type) +{ + switch(type) { + case TFF : return "Top Field First "; + case BFF : return "Bottom Field First"; + case PROGRSSIVE : return "Progressive "; + case UNDETERMINED: return "Undetermined "; + } + return NULL; +} + +static int filter_line_c(const uint8_t *a, const uint8_t *b, const uint8_t *c, int w) +{ + int x; + int ret=0; + + for(x=0; x<w; x++){ + ret += FFABS((*a++ + *c++) - 2 * *b++); + } + + return ret; +} + +static int filter_line_c_16bit(const uint16_t *a, const uint16_t *b, const uint16_t *c, int w) +{ + int x; + int ret=0; + + for(x=0; x<w; x++){ + ret += FFABS((*a++ + *c++) - 2 * *b++); + } + + return ret; +} + +static void filter(AVFilterContext *ctx) +{ + IDETContext *idet = ctx->priv; + int y, i; + int64_t alpha[2]={0}; + int64_t delta=0; + Type type, best_type; + int match = 0; + + for (i = 0; i < idet->csp->nb_components; i++) { + int w = idet->cur->video->w; + int h = idet->cur->video->h; + int refs = idet->cur->linesize[i]; + + if (i && i<3) { + w >>= idet->csp->log2_chroma_w; + h >>= idet->csp->log2_chroma_h; + } + + for (y = 2; y < h - 2; y++) { + uint8_t *prev = &idet->prev->data[i][y*refs]; + uint8_t *cur = &idet->cur ->data[i][y*refs]; + uint8_t *next = &idet->next->data[i][y*refs]; + alpha[ y &1] += idet->filter_line(cur-refs, prev, cur+refs, w); + alpha[(y^1)&1] += idet->filter_line(cur-refs, next, cur+refs, w); + delta += idet->filter_line(cur-refs, cur, cur+refs, w); + } + } + + if (alpha[0] / (float)alpha[1] > idet->interlace_threshold){ + type = TFF; + }else if(alpha[1] / (float)alpha[0] > idet->interlace_threshold){ + type = BFF; + }else if(alpha[1] / (float)delta > idet->progressive_threshold){ + type = PROGRSSIVE; + }else{ + type = UNDETERMINED; + } + + memmove(idet->history+1, idet->history, HIST_SIZE-1); + idet->history[0] = type; + best_type = UNDETERMINED; + for(i=0; i<HIST_SIZE; i++){ + if(idet->history[i] != UNDETERMINED){ + if(best_type == UNDETERMINED) + best_type = idet->history[i]; + + if(idet->history[i] == best_type) { + match++; + }else{ + match=0; + break; + } + } + } + if(idet->last_type == UNDETERMINED){ + if(match ) idet->last_type = best_type; + }else{ + if(match>2) idet->last_type = best_type; + } + + if (idet->last_type == TFF){ + idet->cur->video->top_field_first = 1; + idet->cur->video->interlaced = 1; + }else if(idet->last_type == BFF){ + idet->cur->video->top_field_first = 0; + idet->cur->video->interlaced = 1; + }else if(idet->last_type == PROGRSSIVE){ + idet->cur->video->interlaced = 0; + } + + idet->prestat [ type] ++; + idet->poststat[idet->last_type] ++; + av_log(ctx, AV_LOG_DEBUG, "Single frame:%s, Multi frame:%s\n", type2str(type), type2str(idet->last_type)); +} + +static int start_frame(AVFilterLink *link, AVFilterBufferRef *picref) +{ + AVFilterContext *ctx = link->dst; + IDETContext *idet = ctx->priv; + + if (idet->prev) + avfilter_unref_buffer(idet->prev); + idet->prev = idet->cur; + idet->cur = idet->next; + idet->next = picref; + + if (!idet->cur) + return 0; + + if (!idet->prev) + idet->prev = avfilter_ref_buffer(idet->cur, ~0); + + return ff_start_frame(ctx->outputs[0], avfilter_ref_buffer(idet->cur, ~0)); +} + +static int end_frame(AVFilterLink *link) +{ + AVFilterContext *ctx = link->dst; + IDETContext *idet = ctx->priv; + + if (!idet->cur) + return 0; + + if (!idet->csp) + idet->csp = &av_pix_fmt_descriptors[link->format]; + if (idet->csp->comp[0].depth_minus1 / 8 == 1) + idet->filter_line = (void*)filter_line_c_16bit; + + filter(ctx); + + ff_draw_slice(ctx->outputs[0], 0, link->h, 1); + return ff_end_frame(ctx->outputs[0]); +} + +static int request_frame(AVFilterLink *link) +{ + AVFilterContext *ctx = link->src; + IDETContext *idet = ctx->priv; + + do { + int ret; + + if ((ret = ff_request_frame(link->src->inputs[0]))) + return ret; + } while (!idet->cur); + + return 0; +} + +static int poll_frame(AVFilterLink *link) +{ + IDETContext *idet = link->src->priv; + int ret, val; + + val = ff_poll_frame(link->src->inputs[0]); + + if (val >= 1 && !idet->next) { //FIXME change API to not requre this red tape + if ((ret = ff_request_frame(link->src->inputs[0])) < 0) + return ret; + val = ff_poll_frame(link->src->inputs[0]); + } + assert(idet->next || !val); + + return val; +} + +static av_cold void uninit(AVFilterContext *ctx) +{ + IDETContext *idet = ctx->priv; + + av_log(ctx, AV_LOG_INFO, "Single frame detection: TFF:%d BFF:%d Progressive:%d Undetermined:%d\n", + idet->prestat[TFF], + idet->prestat[BFF], + idet->prestat[PROGRSSIVE], + idet->prestat[UNDETERMINED] + ); + av_log(ctx, AV_LOG_INFO, "Multi frame detection: TFF:%d BFF:%d Progressive:%d Undetermined:%d\n", + idet->poststat[TFF], + idet->poststat[BFF], + idet->poststat[PROGRSSIVE], + idet->poststat[UNDETERMINED] + ); + + if (idet->prev) avfilter_unref_buffer(idet->prev); + if (idet->cur ) avfilter_unref_buffer(idet->cur ); + if (idet->next) avfilter_unref_buffer(idet->next); +} + +static int query_formats(AVFilterContext *ctx) +{ + static const enum AVPixelFormat pix_fmts[] = { + AV_PIX_FMT_YUV420P, + AV_PIX_FMT_YUV422P, + AV_PIX_FMT_YUV444P, + AV_PIX_FMT_YUV410P, + AV_PIX_FMT_YUV411P, + AV_PIX_FMT_GRAY8, + AV_PIX_FMT_YUVJ420P, + AV_PIX_FMT_YUVJ422P, + AV_PIX_FMT_YUVJ444P, + AV_NE( AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_GRAY16LE ), + AV_PIX_FMT_YUV440P, + AV_PIX_FMT_YUVJ440P, + AV_NE( AV_PIX_FMT_YUV420P10BE, AV_PIX_FMT_YUV420P10LE ), + AV_NE( AV_PIX_FMT_YUV422P10BE, AV_PIX_FMT_YUV422P10LE ), + AV_NE( AV_PIX_FMT_YUV444P10BE, AV_PIX_FMT_YUV444P10LE ), + AV_NE( AV_PIX_FMT_YUV420P16BE, AV_PIX_FMT_YUV420P16LE ), + AV_NE( AV_PIX_FMT_YUV422P16BE, AV_PIX_FMT_YUV422P16LE ), + AV_NE( AV_PIX_FMT_YUV444P16BE, AV_PIX_FMT_YUV444P16LE ), + AV_PIX_FMT_YUVA420P, + AV_PIX_FMT_NONE + }; + + ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); + + return 0; +} + +static av_cold int init(AVFilterContext *ctx, const char *args) +{ + IDETContext *idet = ctx->priv; + + idet->csp = NULL; + + idet->interlace_threshold = 1.01; + idet->progressive_threshold = 2.5; + + if (args) sscanf(args, "%f:%f", &idet->interlace_threshold, &idet->progressive_threshold); + + idet->last_type = UNDETERMINED; + memset(idet->history, UNDETERMINED, HIST_SIZE); + + idet->filter_line = filter_line_c; + + return 0; +} + +static int null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { return 0; } + +AVFilter avfilter_vf_idet = { + .name = "idet", + .description = NULL_IF_CONFIG_SMALL("Interlace detect Filter."), + + .priv_size = sizeof(IDETContext), + .init = init, + .uninit = uninit, + .query_formats = query_formats, + + .inputs = (const AVFilterPad[]) {{ .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .start_frame = start_frame, + .draw_slice = null_draw_slice, + .end_frame = end_frame, + .min_perms = AV_PERM_PRESERVE }, + { .name = NULL}}, + + .outputs = (const AVFilterPad[]) {{ .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .rej_perms = AV_PERM_WRITE, + .poll_frame = poll_frame, + .request_frame = request_frame, }, + { .name = NULL}}, +}; 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