LCOV - code coverage report
Current view: top level - libavfilter - vf_detelecine.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 175 0.0 %
Date: 2017-12-13 10:57:33 Functions: 0 6 0.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2015 Himangi Saraogi <himangi774@gmail.com>
       3             :  *
       4             :  * This file is part of FFmpeg.
       5             :  *
       6             :  * FFmpeg is free software; you can redistribute it and/or
       7             :  * modify it under the terms of the GNU Lesser General Public
       8             :  * License as published by the Free Software Foundation; either
       9             :  * version 2.1 of the License, or (at your option) any later version.
      10             :  *
      11             :  * FFmpeg is distributed in the hope that it will be useful,
      12             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14             :  * Lesser General Public License for more details.
      15             :  *
      16             :  * You should have received a copy of the GNU Lesser General Public
      17             :  * License along with FFmpeg; if not, write to the Free Software
      18             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      19             :  */
      20             : 
      21             : /**
      22             :  * @file detelecine filter.
      23             :  */
      24             : 
      25             : 
      26             : #include "libavutil/avstring.h"
      27             : #include "libavutil/imgutils.h"
      28             : #include "libavutil/opt.h"
      29             : #include "libavutil/pixdesc.h"
      30             : #include "avfilter.h"
      31             : #include "formats.h"
      32             : #include "internal.h"
      33             : #include "video.h"
      34             : 
      35             : typedef struct DetelecineContext {
      36             :     const AVClass *class;
      37             :     int first_field;
      38             :     char *pattern;
      39             :     int start_frame;
      40             :     int init_len;
      41             :     unsigned int pattern_pos;
      42             :     unsigned int nskip_fields;
      43             :     int64_t start_time;
      44             : 
      45             :     AVRational pts;
      46             :     AVRational ts_unit;
      47             :     int occupied;
      48             : 
      49             :     int nb_planes;
      50             :     int planeheight[4];
      51             :     int stride[4];
      52             : 
      53             :     AVFrame *frame[2];
      54             :     AVFrame *temp;
      55             : } DetelecineContext;
      56             : 
      57             : #define OFFSET(x) offsetof(DetelecineContext, x)
      58             : #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
      59             : 
      60             : static const AVOption detelecine_options[] = {
      61             :     {"first_field", "select first field", OFFSET(first_field), AV_OPT_TYPE_INT,   {.i64=0}, 0, 1, FLAGS, "field"},
      62             :         {"top",    "select top field first",                0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"},
      63             :         {"t",      "select top field first",                0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"},
      64             :         {"bottom", "select bottom field first",             0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"},
      65             :         {"b",      "select bottom field first",             0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"},
      66             :     {"pattern", "pattern that describe for how many fields a frame is to be displayed", OFFSET(pattern), AV_OPT_TYPE_STRING, {.str="23"}, 0, 0, FLAGS},
      67             :     {"start_frame", "position of first frame with respect to the pattern if stream is cut", OFFSET(start_frame), AV_OPT_TYPE_INT, {.i64=0}, 0, 13, FLAGS},
      68             :     {NULL}
      69             : };
      70             : 
      71             : AVFILTER_DEFINE_CLASS(detelecine);
      72             : 
      73           0 : static av_cold int init(AVFilterContext *ctx)
      74             : {
      75           0 :     DetelecineContext *s = ctx->priv;
      76             :     const char *p;
      77           0 :     int max = 0;
      78           0 :     int sum = 0;
      79             : 
      80           0 :     if (!strlen(s->pattern)) {
      81           0 :         av_log(ctx, AV_LOG_ERROR, "No pattern provided.\n");
      82           0 :         return AVERROR_INVALIDDATA;
      83             :     }
      84             : 
      85           0 :     for (p = s->pattern; *p; p++) {
      86           0 :         if (!av_isdigit(*p)) {
      87           0 :             av_log(ctx, AV_LOG_ERROR, "Provided pattern includes non-numeric characters.\n");
      88           0 :             return AVERROR_INVALIDDATA;
      89             :         }
      90             : 
      91           0 :         sum += *p - '0';
      92           0 :         max = FFMAX(*p - '0', max);
      93           0 :         s->pts.num += *p - '0';
      94           0 :         s->pts.den += 2;
      95             :     }
      96             : 
      97           0 :     if (s->start_frame >= sum) {
      98           0 :         av_log(ctx, AV_LOG_ERROR, "Provided start_frame is too big.\n");
      99           0 :         return AVERROR_INVALIDDATA;
     100             :     }
     101             : 
     102           0 :     s->nskip_fields = 0;
     103           0 :     s->pattern_pos = 0;
     104           0 :     s->start_time = AV_NOPTS_VALUE;
     105           0 :     s->init_len = 0;
     106             : 
     107           0 :     if (s->start_frame != 0) {
     108           0 :         int nfields = 0;
     109           0 :         for (p = s->pattern; *p; p++) {
     110           0 :             nfields += *p - '0';
     111           0 :             s->pattern_pos++;
     112           0 :             if (nfields >= 2*s->start_frame) {
     113           0 :                 s->init_len = nfields - 2*s->start_frame;
     114           0 :                 break;
     115             :             }
     116             :         }
     117             :     }
     118             : 
     119           0 :     av_log(ctx, AV_LOG_INFO, "Detelecine pattern %s removes up to %d frames per frame, pts advance factor: %d/%d\n",
     120           0 :            s->pattern, (max + 1) / 2, s->pts.num, s->pts.den);
     121             : 
     122           0 :     return 0;
     123             : }
     124             : 
     125           0 : static int query_formats(AVFilterContext *ctx)
     126             : {
     127           0 :     AVFilterFormats *pix_fmts = NULL;
     128             :     int fmt, ret;
     129             : 
     130           0 :     for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
     131           0 :         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
     132           0 :         if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
     133           0 :               desc->flags & AV_PIX_FMT_FLAG_PAL     ||
     134           0 :               desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) &&
     135           0 :              (ret = ff_add_format(&pix_fmts, fmt)) < 0)
     136           0 :             return ret;
     137             :     }
     138             : 
     139           0 :     return ff_set_common_formats(ctx, pix_fmts);
     140             : }
     141             : 
     142           0 : static int config_input(AVFilterLink *inlink)
     143             : {
     144           0 :     DetelecineContext *s = inlink->dst->priv;
     145           0 :     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
     146             :     int ret;
     147             : 
     148           0 :     s->temp = ff_get_video_buffer(inlink, inlink->w, inlink->h);
     149           0 :     if (!s->temp)
     150           0 :         return AVERROR(ENOMEM);
     151             : 
     152           0 :     s->frame[0] = ff_get_video_buffer(inlink, inlink->w, inlink->h);
     153           0 :     if (!s->frame[0])
     154           0 :         return AVERROR(ENOMEM);
     155             : 
     156           0 :     s->frame[1] = ff_get_video_buffer(inlink, inlink->w, inlink->h);
     157           0 :     if (!s->frame[1])
     158           0 :         return AVERROR(ENOMEM);
     159             : 
     160           0 :     if ((ret = av_image_fill_linesizes(s->stride, inlink->format, inlink->w)) < 0)
     161           0 :         return ret;
     162             : 
     163           0 :     s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
     164           0 :     s->planeheight[0] = s->planeheight[3] = inlink->h;
     165             : 
     166           0 :     s->nb_planes = av_pix_fmt_count_planes(inlink->format);
     167             : 
     168           0 :     return 0;
     169             : }
     170             : 
     171           0 : static int config_output(AVFilterLink *outlink)
     172             : {
     173           0 :     AVFilterContext *ctx = outlink->src;
     174           0 :     DetelecineContext *s = ctx->priv;
     175           0 :     const AVFilterLink *inlink = ctx->inputs[0];
     176           0 :     AVRational fps = inlink->frame_rate;
     177             : 
     178           0 :     if (!fps.num || !fps.den) {
     179           0 :         av_log(ctx, AV_LOG_ERROR, "The input needs a constant frame rate; "
     180             :                "current rate of %d/%d is invalid\n", fps.num, fps.den);
     181           0 :         return AVERROR(EINVAL);
     182             :     }
     183           0 :     fps = av_mul_q(fps, av_inv_q(s->pts));
     184           0 :     av_log(ctx, AV_LOG_VERBOSE, "FPS: %d/%d -> %d/%d\n",
     185             :            inlink->frame_rate.num, inlink->frame_rate.den, fps.num, fps.den);
     186             : 
     187           0 :     outlink->frame_rate = fps;
     188           0 :     outlink->time_base = av_mul_q(inlink->time_base, s->pts);
     189           0 :     av_log(ctx, AV_LOG_VERBOSE, "TB: %d/%d -> %d/%d\n",
     190             :            inlink->time_base.num, inlink->time_base.den, outlink->time_base.num, outlink->time_base.den);
     191             : 
     192           0 :     s->ts_unit = av_inv_q(av_mul_q(fps, outlink->time_base));
     193             : 
     194           0 :     return 0;
     195             : }
     196             : 
     197           0 : static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
     198             : {
     199           0 :     AVFilterContext *ctx = inlink->dst;
     200           0 :     AVFilterLink *outlink = ctx->outputs[0];
     201           0 :     DetelecineContext *s = ctx->priv;
     202           0 :     int i, len = 0, ret = 0, out = 0;
     203             : 
     204           0 :     if (s->start_time == AV_NOPTS_VALUE)
     205           0 :         s->start_time = inpicref->pts;
     206             : 
     207           0 :     if (s->nskip_fields >= 2) {
     208           0 :         s->nskip_fields -= 2;
     209           0 :         return 0;
     210           0 :     } else if (s->nskip_fields >= 1) {
     211           0 :         for (i = 0; i < s->nb_planes; i++) {
     212           0 :             av_image_copy_plane(s->temp->data[i], s->temp->linesize[i],
     213           0 :                                 inpicref->data[i], inpicref->linesize[i],
     214             :                                 s->stride[i],
     215             :                                 s->planeheight[i]);
     216             :         }
     217           0 :         s->occupied = 1;
     218           0 :         s->nskip_fields--;
     219           0 :         return 0;
     220             :     }
     221             : 
     222           0 :     if (s->nskip_fields == 0) {
     223           0 :         len = s->init_len;
     224           0 :         s->init_len = 0;
     225           0 :         while(!len && s->pattern[s->pattern_pos]) {
     226           0 :             len = s->pattern[s->pattern_pos] - '0';
     227           0 :             s->pattern_pos++;
     228             :         }
     229             : 
     230           0 :         if (!s->pattern[s->pattern_pos])
     231           0 :             s->pattern_pos = 0;
     232             : 
     233           0 :         if(!len) { // do not output any field as the entire pattern is zero
     234           0 :             av_frame_free(&inpicref);
     235           0 :             return 0;
     236             :         }
     237             : 
     238           0 :         if (len == 1 && s->occupied) {
     239           0 :             s->occupied = 0;
     240             :             // output THIS image as-is
     241           0 :             for (i = 0; i < s->nb_planes; i++)
     242           0 :                 av_image_copy_plane(s->frame[out]->data[i], s->frame[out]->linesize[i],
     243           0 :                                     s->temp->data[i], s->temp->linesize[i],
     244             :                                     s->stride[i],
     245             :                                     s->planeheight[i]);
     246           0 :             len = 0;
     247           0 :             while(!len && s->pattern[s->pattern_pos]) {
     248           0 :                 len = s->pattern[s->pattern_pos] - '0';
     249           0 :                 s->pattern_pos++;
     250             :             }
     251             : 
     252           0 :             if (!s->pattern[s->pattern_pos])
     253           0 :                 s->pattern_pos = 0;
     254             : 
     255           0 :             s->occupied = 0;
     256           0 :             ++out;
     257             :         }
     258             : 
     259           0 :         if (s->occupied) {
     260           0 :             for (i = 0; i < s->nb_planes; i++) {
     261             :                 // fill in the EARLIER field from the new pic
     262           0 :                 av_image_copy_plane(s->frame[out]->data[i] + s->frame[out]->linesize[i] * s->first_field,
     263           0 :                                     s->frame[out]->linesize[i] * 2,
     264           0 :                                     inpicref->data[i] + inpicref->linesize[i] * s->first_field,
     265           0 :                                     inpicref->linesize[i] * 2,
     266             :                                     s->stride[i],
     267           0 :                                     (s->planeheight[i] - s->first_field + 1) / 2);
     268             :                 // fill in the LATER field from the buffered pic
     269           0 :                 av_image_copy_plane(s->frame[out]->data[i] + s->frame[out]->linesize[i] * !s->first_field,
     270           0 :                                     s->frame[out]->linesize[i] * 2,
     271           0 :                                     s->temp->data[i] + s->temp->linesize[i] * !s->first_field,
     272           0 :                                     s->temp->linesize[i] * 2,
     273             :                                     s->stride[i],
     274           0 :                                     (s->planeheight[i] - !s->first_field + 1) / 2);
     275             :             }
     276             : 
     277           0 :             s->occupied = 0;
     278           0 :             if (len <= 2) {
     279           0 :                 for (i = 0; i < s->nb_planes; i++) {
     280           0 :                     av_image_copy_plane(s->temp->data[i], s->temp->linesize[i],
     281           0 :                                         inpicref->data[i], inpicref->linesize[i],
     282             :                                         s->stride[i],
     283             :                                         s->planeheight[i]);
     284             :                 }
     285           0 :                 s->occupied = 1;
     286             :             }
     287           0 :             ++out;
     288           0 :             len = (len >= 3) ? len - 3 : 0;
     289             :         } else {
     290           0 :             if (len >= 2) {
     291             :                 // output THIS image as-is
     292           0 :                 for (i = 0; i < s->nb_planes; i++)
     293           0 :                     av_image_copy_plane(s->frame[out]->data[i], s->frame[out]->linesize[i],
     294           0 :                                         inpicref->data[i], inpicref->linesize[i],
     295             :                                         s->stride[i],
     296             :                                         s->planeheight[i]);
     297           0 :                 len -= 2;
     298           0 :                 ++out;
     299           0 :             } else if (len == 1) {
     300             :                 // output THIS image as-is
     301           0 :                 for (i = 0; i < s->nb_planes; i++)
     302           0 :                     av_image_copy_plane(s->frame[out]->data[i], s->frame[out]->linesize[i],
     303           0 :                                         inpicref->data[i], inpicref->linesize[i],
     304             :                                         s->stride[i],
     305             :                                         s->planeheight[i]);
     306             : 
     307           0 :                 for (i = 0; i < s->nb_planes; i++) {
     308           0 :                     av_image_copy_plane(s->temp->data[i], s->temp->linesize[i],
     309           0 :                                         inpicref->data[i], inpicref->linesize[i],
     310             :                                         s->stride[i],
     311             :                                         s->planeheight[i]);
     312             :                 }
     313           0 :                 s->occupied = 1;
     314             : 
     315           0 :                 len--;
     316           0 :                 ++out;
     317             :             }
     318             :         }
     319             : 
     320           0 :         if (len == 1 && s->occupied)
     321             :         {
     322           0 :             len--;
     323           0 :             s->occupied = 0;
     324             :         }
     325             :     }
     326           0 :     s->nskip_fields = len;
     327             : 
     328           0 :     for (i = 0; i < out; ++i) {
     329           0 :         AVFrame *frame = av_frame_clone(s->frame[i]);
     330             : 
     331           0 :         if (!frame) {
     332           0 :             av_frame_free(&inpicref);
     333           0 :             return AVERROR(ENOMEM);
     334             :         }
     335             : 
     336           0 :         av_frame_copy_props(frame, inpicref);
     337           0 :         frame->pts = ((s->start_time == AV_NOPTS_VALUE) ? 0 : s->start_time) +
     338           0 :                      av_rescale(outlink->frame_count_in, s->ts_unit.num,
     339           0 :                                 s->ts_unit.den);
     340           0 :         ret = ff_filter_frame(outlink, frame);
     341             :     }
     342             : 
     343           0 :     av_frame_free(&inpicref);
     344             : 
     345           0 :     return ret;
     346             : }
     347             : 
     348           0 : static av_cold void uninit(AVFilterContext *ctx)
     349             : {
     350           0 :     DetelecineContext *s = ctx->priv;
     351             : 
     352           0 :     av_frame_free(&s->temp);
     353           0 :     av_frame_free(&s->frame[0]);
     354           0 :     av_frame_free(&s->frame[1]);
     355           0 : }
     356             : 
     357             : static const AVFilterPad detelecine_inputs[] = {
     358             :     {
     359             :         .name          = "default",
     360             :         .type          = AVMEDIA_TYPE_VIDEO,
     361             :         .filter_frame  = filter_frame,
     362             :         .config_props  = config_input,
     363             :     },
     364             :     { NULL }
     365             : };
     366             : 
     367             : static const AVFilterPad detelecine_outputs[] = {
     368             :     {
     369             :         .name          = "default",
     370             :         .type          = AVMEDIA_TYPE_VIDEO,
     371             :         .config_props  = config_output,
     372             :     },
     373             :     { NULL }
     374             : };
     375             : 
     376             : AVFilter ff_vf_detelecine = {
     377             :     .name          = "detelecine",
     378             :     .description   = NULL_IF_CONFIG_SMALL("Apply an inverse telecine pattern."),
     379             :     .priv_size     = sizeof(DetelecineContext),
     380             :     .priv_class    = &detelecine_class,
     381             :     .init          = init,
     382             :     .uninit        = uninit,
     383             :     .query_formats = query_formats,
     384             :     .inputs        = detelecine_inputs,
     385             :     .outputs       = detelecine_outputs,
     386             : };

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