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  1. /*
  2.  * Copyright (c) 2011 Stefano Sabatini
  3.  * Copyright (c) 2010 Baptiste Coudurier
  4.  * Copyright (c) 2003 Michael Zucchi <notzed@ximian.com>
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  8.  * FFmpeg is free software; you can redistribute it and/or modify
  9.  * it under the terms of the GNU General Public License as published by
  10.  * the Free Software Foundation; either version 2 of the License, or
  11.  * (at your option) any later version.
  12.  *
  13.  * FFmpeg is distributed in the hope that it will be useful,
  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16.  * GNU General Public License for more details.
  17.  *
  18.  * You should have received a copy of the GNU General Public License along
  19.  * with FFmpeg if not, write to the Free Software Foundation, Inc.,
  20.  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21.  */
  22.  
  23. /**
  24.  * @file
  25.  * temporal field interlace filter, ported from MPlayer/libmpcodecs
  26.  */
  27.  
  28. #include "libavutil/opt.h"
  29. #include "libavutil/imgutils.h"
  30. #include "libavutil/avassert.h"
  31. #include "avfilter.h"
  32. #include "internal.h"
  33.  
  34. enum TInterlaceMode {
  35.     MODE_MERGE = 0,
  36.     MODE_DROP_EVEN,
  37.     MODE_DROP_ODD,
  38.     MODE_PAD,
  39.     MODE_INTERLEAVE_TOP,
  40.     MODE_INTERLEAVE_BOTTOM,
  41.     MODE_INTERLACEX2,
  42.     MODE_NB,
  43. };
  44.  
  45. typedef struct {
  46.     const AVClass *class;
  47.     enum TInterlaceMode mode;   ///< interlace mode selected
  48.     int flags;                  ///< flags affecting interlacing algorithm
  49.     int frame;                  ///< number of the output frame
  50.     int vsub;                   ///< chroma vertical subsampling
  51.     AVFrame *cur;
  52.     AVFrame *next;
  53.     uint8_t *black_data[4];     ///< buffer used to fill padded lines
  54.     int black_linesize[4];
  55. } TInterlaceContext;
  56.  
  57. #define OFFSET(x) offsetof(TInterlaceContext, x)
  58. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
  59. #define TINTERLACE_FLAG_VLPF 01
  60.  
  61. static const AVOption tinterlace_options[] = {
  62.     {"mode",              "select interlace mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_MERGE}, 0, MODE_NB-1, FLAGS, "mode"},
  63.     {"merge",             "merge fields",                                 0, AV_OPT_TYPE_CONST, {.i64=MODE_MERGE},             INT_MIN, INT_MAX, FLAGS, "mode"},
  64.     {"drop_even",         "drop even fields",                             0, AV_OPT_TYPE_CONST, {.i64=MODE_DROP_EVEN},         INT_MIN, INT_MAX, FLAGS, "mode"},
  65.     {"drop_odd",          "drop odd fields",                              0, AV_OPT_TYPE_CONST, {.i64=MODE_DROP_ODD},          INT_MIN, INT_MAX, FLAGS, "mode"},
  66.     {"pad",               "pad alternate lines with black",               0, AV_OPT_TYPE_CONST, {.i64=MODE_PAD},               INT_MIN, INT_MAX, FLAGS, "mode"},
  67.     {"interleave_top",    "interleave top and bottom fields",             0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE_TOP},    INT_MIN, INT_MAX, FLAGS, "mode"},
  68.     {"interleave_bottom", "interleave bottom and top fields",             0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE_BOTTOM}, INT_MIN, INT_MAX, FLAGS, "mode"},
  69.     {"interlacex2",       "interlace fields from two consecutive frames", 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLACEX2},       INT_MIN, INT_MAX, FLAGS, "mode"},
  70.  
  71.     {"flags",             "set flags", OFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, INT_MAX, 0, "flags" },
  72.     {"low_pass_filter",   "enable vertical low-pass filter",              0, AV_OPT_TYPE_CONST, {.i64 = TINTERLACE_FLAG_VLPF}, INT_MIN, INT_MAX, FLAGS, "flags" },
  73.     {"vlpf",              "enable vertical low-pass filter",              0, AV_OPT_TYPE_CONST, {.i64 = TINTERLACE_FLAG_VLPF}, INT_MIN, INT_MAX, FLAGS, "flags" },
  74.  
  75.     {NULL}
  76. };
  77.  
  78. AVFILTER_DEFINE_CLASS(tinterlace);
  79.  
  80. #define FULL_SCALE_YUVJ_FORMATS \
  81.     AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P
  82.  
  83. static enum AVPixelFormat full_scale_yuvj_pix_fmts[] = {
  84.     FULL_SCALE_YUVJ_FORMATS, AV_PIX_FMT_NONE
  85. };
  86.  
  87. static int query_formats(AVFilterContext *ctx)
  88. {
  89.     static const enum AVPixelFormat pix_fmts[] = {
  90.         AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
  91.         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
  92.         AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
  93.         AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
  94.         AV_PIX_FMT_GRAY8, FULL_SCALE_YUVJ_FORMATS,
  95.         AV_PIX_FMT_NONE
  96.     };
  97.  
  98.     ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
  99.     return 0;
  100. }
  101.  
  102. static av_cold void uninit(AVFilterContext *ctx)
  103. {
  104.     TInterlaceContext *tinterlace = ctx->priv;
  105.  
  106.     av_frame_free(&tinterlace->cur );
  107.     av_frame_free(&tinterlace->next);
  108.     av_freep(&tinterlace->black_data[0]);
  109. }
  110.  
  111. static int config_out_props(AVFilterLink *outlink)
  112. {
  113.     AVFilterContext *ctx = outlink->src;
  114.     AVFilterLink *inlink = outlink->src->inputs[0];
  115.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
  116.     TInterlaceContext *tinterlace = ctx->priv;
  117.  
  118.     tinterlace->vsub = desc->log2_chroma_h;
  119.     outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;
  120.     outlink->w = inlink->w;
  121.     outlink->h = tinterlace->mode == MODE_MERGE || tinterlace->mode == MODE_PAD ?
  122.         inlink->h*2 : inlink->h;
  123.  
  124.     if (tinterlace->mode == MODE_PAD) {
  125.         uint8_t black[4] = { 16, 128, 128, 16 };
  126.         int i, ret;
  127.         if (ff_fmt_is_in(outlink->format, full_scale_yuvj_pix_fmts))
  128.             black[0] = black[3] = 0;
  129.         ret = av_image_alloc(tinterlace->black_data, tinterlace->black_linesize,
  130.                              outlink->w, outlink->h, outlink->format, 1);
  131.         if (ret < 0)
  132.             return ret;
  133.  
  134.         /* fill black picture with black */
  135.         for (i = 0; i < 4 && tinterlace->black_data[i]; i++) {
  136.             int h = i == 1 || i == 2 ? FF_CEIL_RSHIFT(outlink->h, desc->log2_chroma_h) : outlink->h;
  137.             memset(tinterlace->black_data[i], black[i],
  138.                    tinterlace->black_linesize[i] * h);
  139.         }
  140.     }
  141.     if ((tinterlace->flags & TINTERLACE_FLAG_VLPF)
  142.             && !(tinterlace->mode == MODE_INTERLEAVE_TOP
  143.               || tinterlace->mode == MODE_INTERLEAVE_BOTTOM)) {
  144.         av_log(ctx, AV_LOG_WARNING, "low_pass_filter flag ignored with mode %d\n",
  145.                 tinterlace->mode);
  146.         tinterlace->flags &= ~TINTERLACE_FLAG_VLPF;
  147.     }
  148.     av_log(ctx, AV_LOG_VERBOSE, "mode:%d filter:%s h:%d -> h:%d\n",
  149.            tinterlace->mode, (tinterlace->flags & TINTERLACE_FLAG_VLPF) ? "on" : "off",
  150.            inlink->h, outlink->h);
  151.  
  152.     return 0;
  153. }
  154.  
  155. #define FIELD_UPPER           0
  156. #define FIELD_LOWER           1
  157. #define FIELD_UPPER_AND_LOWER 2
  158.  
  159. /**
  160.  * Copy picture field from src to dst.
  161.  *
  162.  * @param src_field copy from upper, lower field or both
  163.  * @param interleave leave a padding line between each copied line
  164.  * @param dst_field copy to upper or lower field,
  165.  *        only meaningful when interleave is selected
  166.  * @param flags context flags
  167.  */
  168. static inline
  169. void copy_picture_field(uint8_t *dst[4], int dst_linesize[4],
  170.                         const uint8_t *src[4], int src_linesize[4],
  171.                         enum AVPixelFormat format, int w, int src_h,
  172.                         int src_field, int interleave, int dst_field,
  173.                         int flags)
  174. {
  175.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(format);
  176.     int plane, vsub = desc->log2_chroma_h;
  177.     int k = src_field == FIELD_UPPER_AND_LOWER ? 1 : 2;
  178.     int h, i;
  179.  
  180.     for (plane = 0; plane < desc->nb_components; plane++) {
  181.         int lines = plane == 1 || plane == 2 ? FF_CEIL_RSHIFT(src_h, vsub) : src_h;
  182.         int linesize = av_image_get_linesize(format, w, plane);
  183.         uint8_t *dstp = dst[plane];
  184.         const uint8_t *srcp = src[plane];
  185.  
  186.         if (linesize < 0)
  187.             return;
  188.  
  189.         lines = (lines + (src_field == FIELD_UPPER)) / k;
  190.         if (src_field == FIELD_LOWER)
  191.             srcp += src_linesize[plane];
  192.         if (interleave && dst_field == FIELD_LOWER)
  193.             dstp += dst_linesize[plane];
  194.         if (flags & TINTERLACE_FLAG_VLPF) {
  195.             // Low-pass filtering is required when creating an interlaced destination from
  196.             // a progressive source which contains high-frequency vertical detail.
  197.             // Filtering will reduce interlace 'twitter' and Moire patterning.
  198.             int srcp_linesize = src_linesize[plane] * k;
  199.             int dstp_linesize = dst_linesize[plane] * (interleave ? 2 : 1);
  200.             for (h = lines; h > 0; h--) {
  201.                 const uint8_t *srcp_above = srcp - src_linesize[plane];
  202.                 const uint8_t *srcp_below = srcp + src_linesize[plane];
  203.                 if (h == lines) srcp_above = srcp; // there is no line above
  204.                 if (h == 1) srcp_below = srcp;     // there is no line below
  205.                 for (i = 0; i < linesize; i++) {
  206.                     // this calculation is an integer representation of
  207.                     // '0.5 * current + 0.25 * above + 0.25 * below'
  208.                     // '1 +' is for rounding. */
  209.                     dstp[i] = (1 + srcp[i] + srcp[i] + srcp_above[i] + srcp_below[i]) >> 2;
  210.                 }
  211.                 dstp += dstp_linesize;
  212.                 srcp += srcp_linesize;
  213.             }
  214.         } else {
  215.             av_image_copy_plane(dstp, dst_linesize[plane] * (interleave ? 2 : 1),
  216.                             srcp, src_linesize[plane]*k, linesize, lines);
  217.         }
  218.     }
  219. }
  220.  
  221. static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
  222. {
  223.     AVFilterContext *ctx = inlink->dst;
  224.     AVFilterLink *outlink = ctx->outputs[0];
  225.     TInterlaceContext *tinterlace = ctx->priv;
  226.     AVFrame *cur, *next, *out;
  227.     int field, tff, ret;
  228.  
  229.     av_frame_free(&tinterlace->cur);
  230.     tinterlace->cur  = tinterlace->next;
  231.     tinterlace->next = picref;
  232.  
  233.     cur = tinterlace->cur;
  234.     next = tinterlace->next;
  235.     /* we need at least two frames */
  236.     if (!tinterlace->cur)
  237.         return 0;
  238.  
  239.     switch (tinterlace->mode) {
  240.     case MODE_MERGE: /* move the odd frame into the upper field of the new image, even into
  241.              * the lower field, generating a double-height video at half framerate */
  242.         out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
  243.         if (!out)
  244.             return AVERROR(ENOMEM);
  245.         av_frame_copy_props(out, cur);
  246.         out->height = outlink->h;
  247.         out->interlaced_frame = 1;
  248.         out->top_field_first = 1;
  249.  
  250.         /* write odd frame lines into the upper field of the new frame */
  251.         copy_picture_field(out->data, out->linesize,
  252.                            (const uint8_t **)cur->data, cur->linesize,
  253.                            inlink->format, inlink->w, inlink->h,
  254.                            FIELD_UPPER_AND_LOWER, 1, FIELD_UPPER, tinterlace->flags);
  255.         /* write even frame lines into the lower field of the new frame */
  256.         copy_picture_field(out->data, out->linesize,
  257.                            (const uint8_t **)next->data, next->linesize,
  258.                            inlink->format, inlink->w, inlink->h,
  259.                            FIELD_UPPER_AND_LOWER, 1, FIELD_LOWER, tinterlace->flags);
  260.         av_frame_free(&tinterlace->next);
  261.         break;
  262.  
  263.     case MODE_DROP_ODD:  /* only output even frames, odd  frames are dropped; height unchanged, half framerate */
  264.     case MODE_DROP_EVEN: /* only output odd  frames, even frames are dropped; height unchanged, half framerate */
  265.         out = av_frame_clone(tinterlace->mode == MODE_DROP_EVEN ? cur : next);
  266.         av_frame_free(&tinterlace->next);
  267.         break;
  268.  
  269.     case MODE_PAD: /* expand each frame to double height, but pad alternate
  270.                     * lines with black; framerate unchanged */
  271.         out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
  272.         if (!out)
  273.             return AVERROR(ENOMEM);
  274.         av_frame_copy_props(out, cur);
  275.         out->height = outlink->h;
  276.  
  277.         field = (1 + tinterlace->frame) & 1 ? FIELD_UPPER : FIELD_LOWER;
  278.         /* copy upper and lower fields */
  279.         copy_picture_field(out->data, out->linesize,
  280.                            (const uint8_t **)cur->data, cur->linesize,
  281.                            inlink->format, inlink->w, inlink->h,
  282.                            FIELD_UPPER_AND_LOWER, 1, field, tinterlace->flags);
  283.         /* pad with black the other field */
  284.         copy_picture_field(out->data, out->linesize,
  285.                            (const uint8_t **)tinterlace->black_data, tinterlace->black_linesize,
  286.                            inlink->format, inlink->w, inlink->h,
  287.                            FIELD_UPPER_AND_LOWER, 1, !field, tinterlace->flags);
  288.         break;
  289.  
  290.         /* interleave upper/lower lines from odd frames with lower/upper lines from even frames,
  291.          * halving the frame rate and preserving image height */
  292.     case MODE_INTERLEAVE_TOP:    /* top    field first */
  293.     case MODE_INTERLEAVE_BOTTOM: /* bottom field first */
  294.         tff = tinterlace->mode == MODE_INTERLEAVE_TOP;
  295.         out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
  296.         if (!out)
  297.             return AVERROR(ENOMEM);
  298.         av_frame_copy_props(out, cur);
  299.         out->interlaced_frame = 1;
  300.         out->top_field_first = tff;
  301.  
  302.         /* copy upper/lower field from cur */
  303.         copy_picture_field(out->data, out->linesize,
  304.                            (const uint8_t **)cur->data, cur->linesize,
  305.                            inlink->format, inlink->w, inlink->h,
  306.                            tff ? FIELD_UPPER : FIELD_LOWER, 1, tff ? FIELD_UPPER : FIELD_LOWER,
  307.                            tinterlace->flags);
  308.         /* copy lower/upper field from next */
  309.         copy_picture_field(out->data, out->linesize,
  310.                            (const uint8_t **)next->data, next->linesize,
  311.                            inlink->format, inlink->w, inlink->h,
  312.                            tff ? FIELD_LOWER : FIELD_UPPER, 1, tff ? FIELD_LOWER : FIELD_UPPER,
  313.                            tinterlace->flags);
  314.         av_frame_free(&tinterlace->next);
  315.         break;
  316.     case MODE_INTERLACEX2: /* re-interlace preserving image height, double frame rate */
  317.         /* output current frame first */
  318.         out = av_frame_clone(cur);
  319.         if (!out)
  320.             return AVERROR(ENOMEM);
  321.         out->interlaced_frame = 1;
  322.  
  323.         if ((ret = ff_filter_frame(outlink, out)) < 0)
  324.             return ret;
  325.  
  326.         /* output mix of current and next frame */
  327.         tff = next->top_field_first;
  328.         out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
  329.         if (!out)
  330.             return AVERROR(ENOMEM);
  331.         av_frame_copy_props(out, next);
  332.         out->interlaced_frame = 1;
  333.  
  334.         /* write current frame second field lines into the second field of the new frame */
  335.         copy_picture_field(out->data, out->linesize,
  336.                            (const uint8_t **)cur->data, cur->linesize,
  337.                            inlink->format, inlink->w, inlink->h,
  338.                            tff ? FIELD_LOWER : FIELD_UPPER, 1, tff ? FIELD_LOWER : FIELD_UPPER,
  339.                            tinterlace->flags);
  340.         /* write next frame first field lines into the first field of the new frame */
  341.         copy_picture_field(out->data, out->linesize,
  342.                            (const uint8_t **)next->data, next->linesize,
  343.                            inlink->format, inlink->w, inlink->h,
  344.                            tff ? FIELD_UPPER : FIELD_LOWER, 1, tff ? FIELD_UPPER : FIELD_LOWER,
  345.                            tinterlace->flags);
  346.         break;
  347.     default:
  348.         av_assert0(0);
  349.     }
  350.  
  351.     ret = ff_filter_frame(outlink, out);
  352.     tinterlace->frame++;
  353.  
  354.     return ret;
  355. }
  356.  
  357. static const AVFilterPad tinterlace_inputs[] = {
  358.     {
  359.         .name         = "default",
  360.         .type         = AVMEDIA_TYPE_VIDEO,
  361.         .filter_frame = filter_frame,
  362.     },
  363.     { NULL }
  364. };
  365.  
  366. static const AVFilterPad tinterlace_outputs[] = {
  367.     {
  368.         .name         = "default",
  369.         .type         = AVMEDIA_TYPE_VIDEO,
  370.         .config_props = config_out_props,
  371.     },
  372.     { NULL }
  373. };
  374.  
  375. AVFilter avfilter_vf_tinterlace = {
  376.     .name          = "tinterlace",
  377.     .description   = NULL_IF_CONFIG_SMALL("Perform temporal field interlacing."),
  378.     .priv_size     = sizeof(TInterlaceContext),
  379.     .uninit        = uninit,
  380.     .query_formats = query_formats,
  381.     .inputs        = tinterlace_inputs,
  382.     .outputs       = tinterlace_outputs,
  383.     .priv_class    = &tinterlace_class,
  384. };
  385.