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- /*
- * 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"
- #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 HAVE_MMX
- __asm__ volatile("emms \n\t" : : : "memory");
- #endif
- 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 void 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;
- if (!idet->prev)
- idet->prev = avfilter_ref_buffer(idet->cur, AV_PERM_READ);
- avfilter_start_frame(ctx->outputs[0], avfilter_ref_buffer(idet->cur, AV_PERM_READ));
- }
- static void end_frame(AVFilterLink *link)
- {
- AVFilterContext *ctx = link->dst;
- IDETContext *idet = ctx->priv;
- if (!idet->cur)
- return;
- 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);
- avfilter_draw_slice(ctx->outputs[0], 0, link->h, 1);
- avfilter_end_frame(ctx->outputs[0]);
- }
- static int request_frame(AVFilterLink *link)
- {
- AVFilterContext *ctx = link->src;
- IDETContext *idet = ctx->priv;
- do {
- int ret;
- if ((ret = avfilter_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 = avfilter_poll_frame(link->src->inputs[0]);
- if (val >= 1 && !idet->next) { //FIXME change API to not requre this red tape
- if ((ret = avfilter_request_frame(link->src->inputs[0])) < 0)
- return ret;
- val = avfilter_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 PixelFormat pix_fmts[] = {
- PIX_FMT_YUV420P,
- PIX_FMT_YUV422P,
- PIX_FMT_YUV444P,
- PIX_FMT_YUV410P,
- PIX_FMT_YUV411P,
- PIX_FMT_GRAY8,
- PIX_FMT_YUVJ420P,
- PIX_FMT_YUVJ422P,
- PIX_FMT_YUVJ444P,
- AV_NE( PIX_FMT_GRAY16BE, PIX_FMT_GRAY16LE ),
- PIX_FMT_YUV440P,
- PIX_FMT_YUVJ440P,
- AV_NE( PIX_FMT_YUV420P10BE, PIX_FMT_YUV420P10LE ),
- AV_NE( PIX_FMT_YUV422P10BE, PIX_FMT_YUV422P10LE ),
- AV_NE( PIX_FMT_YUV444P10BE, PIX_FMT_YUV444P10LE ),
- AV_NE( PIX_FMT_YUV420P16BE, PIX_FMT_YUV420P16LE ),
- AV_NE( PIX_FMT_YUV422P16BE, PIX_FMT_YUV422P16LE ),
- AV_NE( PIX_FMT_YUV444P16BE, PIX_FMT_YUV444P16LE ),
- PIX_FMT_YUVA420P,
- PIX_FMT_NONE
- };
- avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
- return 0;
- }
- static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
- {
- 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 void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
- 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,
- .rej_perms = AV_PERM_REUSE2, },
- { .name = NULL}},
- .outputs = (const AVFilterPad[]) {{ .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- .poll_frame = poll_frame,
- .request_frame = request_frame, },
- { .name = NULL}},
- };
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