LCOV - code coverage report
Current view: top level - libavfilter - vf_fieldorder.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 53 64 82.8 %
Date: 2017-12-11 04:34:20 Functions: 3 3 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2011 Mark Himsley
       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
      23             :  * video field order filter, heavily influenced by vf_pad.c
      24             :  */
      25             : 
      26             : #include "libavutil/imgutils.h"
      27             : #include "libavutil/internal.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 FieldOrderContext {
      36             :     const AVClass *class;
      37             :     int dst_tff;               ///< output bff/tff
      38             :     int          line_size[4]; ///< bytes of pixel data per line for each plane
      39             : } FieldOrderContext;
      40             : 
      41         110 : static int query_formats(AVFilterContext *ctx)
      42             : {
      43             :     AVFilterFormats  *formats;
      44             :     enum AVPixelFormat pix_fmt;
      45             :     int              ret;
      46             : 
      47             :     /** accept any input pixel format that is not hardware accelerated, not
      48             :      *  a bitstream format, and does not have vertically sub-sampled chroma */
      49         110 :     if (ctx->inputs[0]) {
      50         110 :         const AVPixFmtDescriptor *desc = NULL;
      51         110 :         formats = NULL;
      52       20350 :         while ((desc = av_pix_fmt_desc_next(desc))) {
      53       20130 :             pix_fmt = av_pix_fmt_desc_get_id(desc);
      54       56980 :             if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
      55       18480 :                   desc->flags & AV_PIX_FMT_FLAG_PAL     ||
      56       36300 :                   desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) &&
      57       50270 :                 desc->nb_components && !desc->log2_chroma_h &&
      58       14410 :                 (ret = ff_add_format(&formats, pix_fmt)) < 0)
      59           0 :                 return ret;
      60             :         }
      61         220 :         if ((ret = ff_formats_ref(formats, &ctx->inputs[0]->out_formats)) < 0 ||
      62         110 :             (ret = ff_formats_ref(formats, &ctx->outputs[0]->in_formats)) < 0)
      63           0 :             return ret;
      64             :     }
      65             : 
      66         110 :     return 0;
      67             : }
      68             : 
      69         109 : static int config_input(AVFilterLink *inlink)
      70             : {
      71         109 :     AVFilterContext   *ctx = inlink->dst;
      72         109 :     FieldOrderContext *s   = ctx->priv;
      73             : 
      74         109 :     return av_image_fill_linesizes(s->line_size, inlink->format, inlink->w);
      75             : }
      76             : 
      77         133 : static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
      78             : {
      79         133 :     AVFilterContext   *ctx     = inlink->dst;
      80         133 :     FieldOrderContext *s       = ctx->priv;
      81         133 :     AVFilterLink      *outlink = ctx->outputs[0];
      82             :     int h, plane, src_line_step, dst_line_step, line_size, line;
      83             :     uint8_t *dst, *src;
      84             :     AVFrame *out;
      85             : 
      86         266 :     if (!frame->interlaced_frame ||
      87         133 :         frame->top_field_first == s->dst_tff) {
      88           0 :         av_log(ctx, AV_LOG_VERBOSE,
      89             :                "Skipping %s.\n",
      90           0 :                frame->interlaced_frame ?
      91             :                "frame with same field order" : "progressive frame");
      92           0 :         return ff_filter_frame(outlink, frame);
      93             :     }
      94             : 
      95         133 :     if (av_frame_is_writable(frame)) {
      96         133 :         out = frame;
      97             :     } else {
      98           0 :         out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
      99           0 :         if (!out) {
     100           0 :             av_frame_free(&frame);
     101           0 :             return AVERROR(ENOMEM);
     102             :         }
     103           0 :         av_frame_copy_props(out, frame);
     104             :     }
     105             : 
     106         133 :     av_log(ctx, AV_LOG_TRACE,
     107             :             "picture will move %s one line\n",
     108         133 :             s->dst_tff ? "up" : "down");
     109         133 :     h = frame->height;
     110         403 :     for (plane = 0; plane < 4 && frame->data[plane] && frame->linesize[plane]; plane++) {
     111         270 :         dst_line_step = out->linesize[plane];
     112         270 :         src_line_step = frame->linesize[plane];
     113         270 :         line_size = s->line_size[plane];
     114         270 :         dst = out->data[plane];
     115         270 :         src = frame->data[plane];
     116         270 :         if (s->dst_tff) {
     117             :             /** Move every line up one line, working from
     118             :              *  the top to the bottom of the frame.
     119             :              *  The original top line is lost.
     120             :              *  The new last line is created as a copy of the
     121             :              *  penultimate line from that field. */
     122       70805 :             for (line = 0; line < h; line++) {
     123       70560 :                 if (1 + line < frame->height) {
     124       70315 :                     memcpy(dst, src + src_line_step, line_size);
     125             :                 } else {
     126         245 :                     memcpy(dst, src - 2 * src_line_step, line_size);
     127             :                 }
     128       70560 :                 dst += dst_line_step;
     129       70560 :                 src += src_line_step;
     130             :             }
     131             :         } else {
     132             :             /** Move every line down one line, working from
     133             :              *  the bottom to the top of the frame.
     134             :              *  The original bottom line is lost.
     135             :              *  The new first line is created as a copy of the
     136             :              *  second line from that field. */
     137          25 :             dst += (h - 1) * dst_line_step;
     138          25 :             src += (h - 1) * src_line_step;
     139        7225 :             for (line = h - 1; line >= 0 ; line--) {
     140        7200 :                 if (line > 0) {
     141        7175 :                     memcpy(dst, src - src_line_step, line_size);
     142             :                 } else {
     143          25 :                     memcpy(dst, src + 2 * src_line_step, line_size);
     144             :                 }
     145        7200 :                 dst -= dst_line_step;
     146        7200 :                 src -= src_line_step;
     147             :             }
     148             :         }
     149             :     }
     150         133 :     out->top_field_first = s->dst_tff;
     151             : 
     152         133 :     if (frame != out)
     153           0 :         av_frame_free(&frame);
     154         133 :     return ff_filter_frame(outlink, out);
     155             : }
     156             : 
     157             : #define OFFSET(x) offsetof(FieldOrderContext, x)
     158             : #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
     159             : 
     160             : static const AVOption fieldorder_options[] = {
     161             :     { "order", "output field order", OFFSET(dst_tff), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, FLAGS, "order" },
     162             :         { "bff", "bottom field first", 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, .flags=FLAGS, .unit = "order" },
     163             :         { "tff", "top field first",    0, AV_OPT_TYPE_CONST, { .i64 = 1 }, .flags=FLAGS, .unit = "order" },
     164             :     { NULL }
     165             : };
     166             : 
     167             : AVFILTER_DEFINE_CLASS(fieldorder);
     168             : 
     169             : static const AVFilterPad avfilter_vf_fieldorder_inputs[] = {
     170             :     {
     171             :         .name         = "default",
     172             :         .type         = AVMEDIA_TYPE_VIDEO,
     173             :         .config_props = config_input,
     174             :         .filter_frame = filter_frame,
     175             :     },
     176             :     { NULL }
     177             : };
     178             : 
     179             : static const AVFilterPad avfilter_vf_fieldorder_outputs[] = {
     180             :     {
     181             :         .name = "default",
     182             :         .type = AVMEDIA_TYPE_VIDEO,
     183             :     },
     184             :     { NULL }
     185             : };
     186             : 
     187             : AVFilter ff_vf_fieldorder = {
     188             :     .name          = "fieldorder",
     189             :     .description   = NULL_IF_CONFIG_SMALL("Set the field order."),
     190             :     .priv_size     = sizeof(FieldOrderContext),
     191             :     .priv_class    = &fieldorder_class,
     192             :     .query_formats = query_formats,
     193             :     .inputs        = avfilter_vf_fieldorder_inputs,
     194             :     .outputs       = avfilter_vf_fieldorder_outputs,
     195             :     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
     196             : };

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