LCOV - code coverage report
Current view: top level - libavfilter - vf_telecine.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 104 118 88.1 %
Date: 2017-12-13 10:57:33 Functions: 6 6 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2012 Rudolf Polzer
       3             :  * Copyright (c) 2013 Paul B Mahol
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : /**
      23             :  * @file telecine filter, heavily based from mpv-player:TOOLS/vf_dlopen/telecine.c by
      24             :  * Rudolf Polzer.
      25             :  */
      26             : 
      27             : #include "libavutil/avstring.h"
      28             : #include "libavutil/imgutils.h"
      29             : #include "libavutil/opt.h"
      30             : #include "libavutil/pixdesc.h"
      31             : #include "avfilter.h"
      32             : #include "formats.h"
      33             : #include "internal.h"
      34             : #include "video.h"
      35             : 
      36             : typedef struct TelecineContext {
      37             :     const AVClass *class;
      38             :     int first_field;
      39             :     char *pattern;
      40             :     unsigned int pattern_pos;
      41             :     int64_t start_time;
      42             : 
      43             :     AVRational pts;
      44             :     AVRational ts_unit;
      45             :     int out_cnt;
      46             :     int occupied;
      47             : 
      48             :     int nb_planes;
      49             :     int planeheight[4];
      50             :     int stride[4];
      51             : 
      52             :     AVFrame *frame[5];
      53             :     AVFrame *temp;
      54             : } TelecineContext;
      55             : 
      56             : #define OFFSET(x) offsetof(TelecineContext, x)
      57             : #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
      58             : 
      59             : static const AVOption telecine_options[] = {
      60             :     {"first_field", "select first field", OFFSET(first_field), AV_OPT_TYPE_INT,   {.i64=0}, 0, 1, FLAGS, "field"},
      61             :         {"top",    "select top field first",                0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"},
      62             :         {"t",      "select top field first",                0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"},
      63             :         {"bottom", "select bottom field first",             0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"},
      64             :         {"b",      "select bottom field first",             0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"},
      65             :     {"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},
      66             :     {NULL}
      67             : };
      68             : 
      69             : AVFILTER_DEFINE_CLASS(telecine);
      70             : 
      71          18 : static av_cold int init(AVFilterContext *ctx)
      72             : {
      73          18 :     TelecineContext *s = ctx->priv;
      74             :     const char *p;
      75          18 :     int max = 0;
      76             : 
      77          18 :     if (!strlen(s->pattern)) {
      78           0 :         av_log(ctx, AV_LOG_ERROR, "No pattern provided.\n");
      79           0 :         return AVERROR_INVALIDDATA;
      80             :     }
      81             : 
      82          54 :     for (p = s->pattern; *p; p++) {
      83          36 :         if (!av_isdigit(*p)) {
      84           0 :             av_log(ctx, AV_LOG_ERROR, "Provided pattern includes non-numeric characters.\n");
      85           0 :             return AVERROR_INVALIDDATA;
      86             :         }
      87             : 
      88          36 :         max = FFMAX(*p - '0', max);
      89          36 :         s->pts.num += 2;
      90          36 :         s->pts.den += *p - '0';
      91             :     }
      92             : 
      93          18 :     s->start_time = AV_NOPTS_VALUE;
      94             : 
      95          18 :     s->out_cnt = (max + 1) / 2;
      96          18 :     av_log(ctx, AV_LOG_INFO, "Telecine pattern %s yields up to %d frames per frame, pts advance factor: %d/%d\n",
      97             :            s->pattern, s->out_cnt, s->pts.num, s->pts.den);
      98             : 
      99          18 :     return 0;
     100             : }
     101             : 
     102          18 : static int query_formats(AVFilterContext *ctx)
     103             : {
     104          18 :     AVFilterFormats *pix_fmts = NULL;
     105             :     int fmt, ret;
     106             : 
     107        3312 :     for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
     108        3294 :         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
     109        9324 :         if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
     110        3024 :               desc->flags & AV_PIX_FMT_FLAG_PAL     ||
     111        5940 :               desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) &&
     112        2934 :             (ret = ff_add_format(&pix_fmts, fmt)) < 0)
     113           0 :             return ret;
     114             :     }
     115             : 
     116          18 :     return ff_set_common_formats(ctx, pix_fmts);
     117             : }
     118             : 
     119          18 : static int config_input(AVFilterLink *inlink)
     120             : {
     121          18 :     TelecineContext *s = inlink->dst->priv;
     122          18 :     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
     123             :     int i, ret;
     124             : 
     125          18 :     s->temp = ff_get_video_buffer(inlink, inlink->w, inlink->h);
     126          18 :     if (!s->temp)
     127           0 :         return AVERROR(ENOMEM);
     128          54 :     for (i = 0; i < s->out_cnt; i++) {
     129          36 :         s->frame[i] = ff_get_video_buffer(inlink, inlink->w, inlink->h);
     130          36 :         if (!s->frame[i])
     131           0 :             return AVERROR(ENOMEM);
     132             :     }
     133             : 
     134          18 :     if ((ret = av_image_fill_linesizes(s->stride, inlink->format, inlink->w)) < 0)
     135           0 :         return ret;
     136             : 
     137          18 :     s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
     138          18 :     s->planeheight[0] = s->planeheight[3] = inlink->h;
     139             : 
     140          18 :     s->nb_planes = av_pix_fmt_count_planes(inlink->format);
     141             : 
     142          18 :     return 0;
     143             : }
     144             : 
     145          18 : static int config_output(AVFilterLink *outlink)
     146             : {
     147          18 :     AVFilterContext *ctx = outlink->src;
     148          18 :     TelecineContext *s = ctx->priv;
     149          18 :     const AVFilterLink *inlink = ctx->inputs[0];
     150          18 :     AVRational fps = inlink->frame_rate;
     151             : 
     152          18 :     if (!fps.num || !fps.den) {
     153           0 :         av_log(ctx, AV_LOG_ERROR, "The input needs a constant frame rate; "
     154             :                "current rate of %d/%d is invalid\n", fps.num, fps.den);
     155           0 :         return AVERROR(EINVAL);
     156             :     }
     157          18 :     fps = av_mul_q(fps, av_inv_q(s->pts));
     158          18 :     av_log(ctx, AV_LOG_VERBOSE, "FPS: %d/%d -> %d/%d\n",
     159             :            inlink->frame_rate.num, inlink->frame_rate.den, fps.num, fps.den);
     160             : 
     161          18 :     outlink->frame_rate = fps;
     162          18 :     outlink->time_base = av_mul_q(inlink->time_base, s->pts);
     163          18 :     av_log(ctx, AV_LOG_VERBOSE, "TB: %d/%d -> %d/%d\n",
     164             :            inlink->time_base.num, inlink->time_base.den, outlink->time_base.num, outlink->time_base.den);
     165             : 
     166          18 :     s->ts_unit = av_inv_q(av_mul_q(fps, outlink->time_base));
     167             : 
     168          18 :     return 0;
     169             : }
     170             : 
     171         479 : static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
     172             : {
     173         479 :     AVFilterContext *ctx = inlink->dst;
     174         479 :     AVFilterLink *outlink = ctx->outputs[0];
     175         479 :     TelecineContext *s = ctx->priv;
     176         479 :     int i, len, ret = 0, nout = 0;
     177             : 
     178         479 :     if (s->start_time == AV_NOPTS_VALUE)
     179          18 :         s->start_time = inpicref->pts;
     180             : 
     181         479 :     len = s->pattern[s->pattern_pos] - '0';
     182             : 
     183         479 :     s->pattern_pos++;
     184         479 :     if (!s->pattern[s->pattern_pos])
     185         231 :         s->pattern_pos = 0;
     186             : 
     187         479 :     if (!len) { // do not output any field from this frame
     188           0 :         av_frame_free(&inpicref);
     189           0 :         return 0;
     190             :     }
     191             : 
     192         479 :     if (s->occupied) {
     193         230 :         av_frame_make_writable(s->frame[nout]);
     194         920 :         for (i = 0; i < s->nb_planes; i++) {
     195             :             // fill in the EARLIER field from the buffered pic
     196        2070 :             av_image_copy_plane(s->frame[nout]->data[i] + s->frame[nout]->linesize[i] * s->first_field,
     197         690 :                                 s->frame[nout]->linesize[i] * 2,
     198         690 :                                 s->temp->data[i] + s->temp->linesize[i] * s->first_field,
     199         690 :                                 s->temp->linesize[i] * 2,
     200             :                                 s->stride[i],
     201         690 :                                 (s->planeheight[i] - s->first_field + 1) / 2);
     202             :             // fill in the LATER field from the new pic
     203        2070 :             av_image_copy_plane(s->frame[nout]->data[i] + s->frame[nout]->linesize[i] * !s->first_field,
     204         690 :                                 s->frame[nout]->linesize[i] * 2,
     205         690 :                                 inpicref->data[i] + inpicref->linesize[i] * !s->first_field,
     206         690 :                                 inpicref->linesize[i] * 2,
     207             :                                 s->stride[i],
     208         690 :                                 (s->planeheight[i] - !s->first_field + 1) / 2);
     209             :         }
     210         230 :         nout++;
     211         230 :         len--;
     212         230 :         s->occupied = 0;
     213             :     }
     214             : 
     215        1316 :     while (len >= 2) {
     216             :         // output THIS image as-is
     217         358 :         av_frame_make_writable(s->frame[nout]);
     218        1432 :         for (i = 0; i < s->nb_planes; i++)
     219        3222 :             av_image_copy_plane(s->frame[nout]->data[i], s->frame[nout]->linesize[i],
     220        2148 :                                 inpicref->data[i], inpicref->linesize[i],
     221             :                                 s->stride[i],
     222             :                                 s->planeheight[i]);
     223         358 :         nout++;
     224         358 :         len -= 2;
     225             :     }
     226             : 
     227         479 :     if (len >= 1) {
     228             :         // copy THIS image to the buffer, we need it later
     229         972 :         for (i = 0; i < s->nb_planes; i++)
     230        2187 :             av_image_copy_plane(s->temp->data[i], s->temp->linesize[i],
     231        1458 :                                 inpicref->data[i], inpicref->linesize[i],
     232             :                                 s->stride[i],
     233             :                                 s->planeheight[i]);
     234         243 :         s->occupied = 1;
     235             :     }
     236             : 
     237        1067 :     for (i = 0; i < nout; i++) {
     238         588 :         AVFrame *frame = av_frame_clone(s->frame[i]);
     239             : 
     240         588 :         if (!frame) {
     241           0 :             av_frame_free(&inpicref);
     242           0 :             return AVERROR(ENOMEM);
     243             :         }
     244             : 
     245         588 :         av_frame_copy_props(frame, inpicref);
     246        1176 :         frame->pts = ((s->start_time == AV_NOPTS_VALUE) ? 0 : s->start_time) +
     247         588 :                      av_rescale(outlink->frame_count_in, s->ts_unit.num,
     248         588 :                                 s->ts_unit.den);
     249         588 :         ret = ff_filter_frame(outlink, frame);
     250             :     }
     251         479 :     av_frame_free(&inpicref);
     252             : 
     253         479 :     return ret;
     254             : }
     255             : 
     256          18 : static av_cold void uninit(AVFilterContext *ctx)
     257             : {
     258          18 :     TelecineContext *s = ctx->priv;
     259             :     int i;
     260             : 
     261          18 :     av_frame_free(&s->temp);
     262          54 :     for (i = 0; i < s->out_cnt; i++)
     263          36 :         av_frame_free(&s->frame[i]);
     264          18 : }
     265             : 
     266             : static const AVFilterPad telecine_inputs[] = {
     267             :     {
     268             :         .name          = "default",
     269             :         .type          = AVMEDIA_TYPE_VIDEO,
     270             :         .filter_frame  = filter_frame,
     271             :         .config_props  = config_input,
     272             :     },
     273             :     { NULL }
     274             : };
     275             : 
     276             : static const AVFilterPad telecine_outputs[] = {
     277             :     {
     278             :         .name          = "default",
     279             :         .type          = AVMEDIA_TYPE_VIDEO,
     280             :         .config_props  = config_output,
     281             :     },
     282             :     { NULL }
     283             : };
     284             : 
     285             : AVFilter ff_vf_telecine = {
     286             :     .name          = "telecine",
     287             :     .description   = NULL_IF_CONFIG_SMALL("Apply a telecine pattern."),
     288             :     .priv_size     = sizeof(TelecineContext),
     289             :     .priv_class    = &telecine_class,
     290             :     .init          = init,
     291             :     .uninit        = uninit,
     292             :     .query_formats = query_formats,
     293             :     .inputs        = telecine_inputs,
     294             :     .outputs       = telecine_outputs,
     295             : };

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