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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. #include "tinterlace.h"
  34.  
  35. #define OFFSET(x) offsetof(TInterlaceContext, x)
  36. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
  37. #define TINTERLACE_FLAG_VLPF 01
  38. #define TINTERLACE_FLAG_EXACT_TB 2
  39.  
  40. static const AVOption tinterlace_options[] = {
  41.     {"mode",              "select interlace mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_MERGE}, 0, MODE_NB-1, FLAGS, "mode"},
  42.     {"merge",             "merge fields",                                 0, AV_OPT_TYPE_CONST, {.i64=MODE_MERGE},             INT_MIN, INT_MAX, FLAGS, "mode"},
  43.     {"drop_even",         "drop even fields",                             0, AV_OPT_TYPE_CONST, {.i64=MODE_DROP_EVEN},         INT_MIN, INT_MAX, FLAGS, "mode"},
  44.     {"drop_odd",          "drop odd fields",                              0, AV_OPT_TYPE_CONST, {.i64=MODE_DROP_ODD},          INT_MIN, INT_MAX, FLAGS, "mode"},
  45.     {"pad",               "pad alternate lines with black",               0, AV_OPT_TYPE_CONST, {.i64=MODE_PAD},               INT_MIN, INT_MAX, FLAGS, "mode"},
  46.     {"interleave_top",    "interleave top and bottom fields",             0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE_TOP},    INT_MIN, INT_MAX, FLAGS, "mode"},
  47.     {"interleave_bottom", "interleave bottom and top fields",             0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE_BOTTOM}, INT_MIN, INT_MAX, FLAGS, "mode"},
  48.     {"interlacex2",       "interlace fields from two consecutive frames", 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLACEX2},       INT_MIN, INT_MAX, FLAGS, "mode"},
  49.  
  50.     {"flags",             "set flags", OFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, INT_MAX, 0, "flags" },
  51.     {"low_pass_filter",   "enable vertical low-pass filter",              0, AV_OPT_TYPE_CONST, {.i64 = TINTERLACE_FLAG_VLPF}, INT_MIN, INT_MAX, FLAGS, "flags" },
  52.     {"vlpf",              "enable vertical low-pass filter",              0, AV_OPT_TYPE_CONST, {.i64 = TINTERLACE_FLAG_VLPF}, INT_MIN, INT_MAX, FLAGS, "flags" },
  53.     {"exact_tb",          "force a timebase which can represent timestamps exactly", 0, AV_OPT_TYPE_CONST, {.i64 = TINTERLACE_FLAG_EXACT_TB}, INT_MIN, INT_MAX, FLAGS, "flags" },
  54.  
  55.     {NULL}
  56. };
  57.  
  58. AVFILTER_DEFINE_CLASS(tinterlace);
  59.  
  60. #define FULL_SCALE_YUVJ_FORMATS \
  61.     AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P
  62.  
  63. static const enum AVPixelFormat full_scale_yuvj_pix_fmts[] = {
  64.     FULL_SCALE_YUVJ_FORMATS, AV_PIX_FMT_NONE
  65. };
  66.  
  67. static const AVRational standard_tbs[] = {
  68.     {1, 25},
  69.     {1, 30},
  70.     {1001, 30000},
  71. };
  72.  
  73. static int query_formats(AVFilterContext *ctx)
  74. {
  75.     static const enum AVPixelFormat pix_fmts[] = {
  76.         AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
  77.         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
  78.         AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
  79.         AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
  80.         AV_PIX_FMT_GRAY8, FULL_SCALE_YUVJ_FORMATS,
  81.         AV_PIX_FMT_NONE
  82.     };
  83.  
  84.     AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
  85.     if (!fmts_list)
  86.         return AVERROR(ENOMEM);
  87.     return ff_set_common_formats(ctx, fmts_list);
  88. }
  89.  
  90. static void lowpass_line_c(uint8_t *dstp, ptrdiff_t width, const uint8_t *srcp,
  91.                            const uint8_t *srcp_above, const uint8_t *srcp_below)
  92. {
  93.     int i;
  94.     for (i = 0; i < width; i++) {
  95.         // this calculation is an integer representation of
  96.         // '0.5 * current + 0.25 * above + 0.25 * below'
  97.         // '1 +' is for rounding.
  98.         dstp[i] = (1 + srcp[i] + srcp[i] + srcp_above[i] + srcp_below[i]) >> 2;
  99.     }
  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.     int i;
  118.  
  119.     tinterlace->vsub = desc->log2_chroma_h;
  120.     outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;
  121.     outlink->w = inlink->w;
  122.     outlink->h = tinterlace->mode == MODE_MERGE || tinterlace->mode == MODE_PAD ?
  123.         inlink->h*2 : inlink->h;
  124.     if (tinterlace->mode == MODE_MERGE || tinterlace->mode == MODE_PAD)
  125.         outlink->sample_aspect_ratio = av_mul_q(inlink->sample_aspect_ratio,
  126.                                                 av_make_q(2, 1));
  127.  
  128.     if (tinterlace->mode == MODE_PAD) {
  129.         uint8_t black[4] = { 16, 128, 128, 16 };
  130.         int i, ret;
  131.         if (ff_fmt_is_in(outlink->format, full_scale_yuvj_pix_fmts))
  132.             black[0] = black[3] = 0;
  133.         ret = av_image_alloc(tinterlace->black_data, tinterlace->black_linesize,
  134.                              outlink->w, outlink->h, outlink->format, 1);
  135.         if (ret < 0)
  136.             return ret;
  137.  
  138.         /* fill black picture with black */
  139.         for (i = 0; i < 4 && tinterlace->black_data[i]; i++) {
  140.             int h = i == 1 || i == 2 ? FF_CEIL_RSHIFT(outlink->h, desc->log2_chroma_h) : outlink->h;
  141.             memset(tinterlace->black_data[i], black[i],
  142.                    tinterlace->black_linesize[i] * h);
  143.         }
  144.     }
  145.     if ((tinterlace->flags & TINTERLACE_FLAG_VLPF)
  146.             && !(tinterlace->mode == MODE_INTERLEAVE_TOP
  147.               || tinterlace->mode == MODE_INTERLEAVE_BOTTOM)) {
  148.         av_log(ctx, AV_LOG_WARNING, "low_pass_filter flag ignored with mode %d\n",
  149.                 tinterlace->mode);
  150.         tinterlace->flags &= ~TINTERLACE_FLAG_VLPF;
  151.     }
  152.     tinterlace->preout_time_base = inlink->time_base;
  153.     if (tinterlace->mode == MODE_INTERLACEX2) {
  154.         tinterlace->preout_time_base.den *= 2;
  155.         outlink->frame_rate = av_mul_q(inlink->frame_rate, (AVRational){2,1});
  156.         outlink->time_base  = av_mul_q(inlink->time_base , (AVRational){1,2});
  157.     } else if (tinterlace->mode != MODE_PAD) {
  158.         outlink->frame_rate = av_mul_q(inlink->frame_rate, (AVRational){1,2});
  159.         outlink->time_base  = av_mul_q(inlink->time_base , (AVRational){2,1});
  160.     }
  161.  
  162.     for (i = 0; i<FF_ARRAY_ELEMS(standard_tbs); i++){
  163.         if (!av_cmp_q(standard_tbs[i], outlink->time_base))
  164.             break;
  165.     }
  166.     if (i == FF_ARRAY_ELEMS(standard_tbs) ||
  167.         (tinterlace->flags & TINTERLACE_FLAG_EXACT_TB))
  168.         outlink->time_base = tinterlace->preout_time_base;
  169.  
  170.     if (tinterlace->flags & TINTERLACE_FLAG_VLPF) {
  171.         tinterlace->lowpass_line = lowpass_line_c;
  172.         if (ARCH_X86)
  173.             ff_tinterlace_init_x86(tinterlace);
  174.     }
  175.  
  176.     av_log(ctx, AV_LOG_VERBOSE, "mode:%d filter:%s h:%d -> h:%d\n",
  177.            tinterlace->mode, (tinterlace->flags & TINTERLACE_FLAG_VLPF) ? "on" : "off",
  178.            inlink->h, outlink->h);
  179.  
  180.     return 0;
  181. }
  182.  
  183. #define FIELD_UPPER           0
  184. #define FIELD_LOWER           1
  185. #define FIELD_UPPER_AND_LOWER 2
  186.  
  187. /**
  188.  * Copy picture field from src to dst.
  189.  *
  190.  * @param src_field copy from upper, lower field or both
  191.  * @param interleave leave a padding line between each copied line
  192.  * @param dst_field copy to upper or lower field,
  193.  *        only meaningful when interleave is selected
  194.  * @param flags context flags
  195.  */
  196. static inline
  197. void copy_picture_field(TInterlaceContext *tinterlace,
  198.                         uint8_t *dst[4], int dst_linesize[4],
  199.                         const uint8_t *src[4], int src_linesize[4],
  200.                         enum AVPixelFormat format, int w, int src_h,
  201.                         int src_field, int interleave, int dst_field,
  202.                         int flags)
  203. {
  204.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(format);
  205.     int hsub = desc->log2_chroma_w;
  206.     int plane, vsub = desc->log2_chroma_h;
  207.     int k = src_field == FIELD_UPPER_AND_LOWER ? 1 : 2;
  208.     int h;
  209.  
  210.     for (plane = 0; plane < desc->nb_components; plane++) {
  211.         int lines = plane == 1 || plane == 2 ? FF_CEIL_RSHIFT(src_h, vsub) : src_h;
  212.         int cols  = plane == 1 || plane == 2 ? FF_CEIL_RSHIFT(    w, hsub) : w;
  213.         uint8_t *dstp = dst[plane];
  214.         const uint8_t *srcp = src[plane];
  215.  
  216.         lines = (lines + (src_field == FIELD_UPPER)) / k;
  217.         if (src_field == FIELD_LOWER)
  218.             srcp += src_linesize[plane];
  219.         if (interleave && dst_field == FIELD_LOWER)
  220.             dstp += dst_linesize[plane];
  221.         if (flags & TINTERLACE_FLAG_VLPF) {
  222.             // Low-pass filtering is required when creating an interlaced destination from
  223.             // a progressive source which contains high-frequency vertical detail.
  224.             // Filtering will reduce interlace 'twitter' and Moire patterning.
  225.             int srcp_linesize = src_linesize[plane] * k;
  226.             int dstp_linesize = dst_linesize[plane] * (interleave ? 2 : 1);
  227.             for (h = lines; h > 0; h--) {
  228.                 const uint8_t *srcp_above = srcp - src_linesize[plane];
  229.                 const uint8_t *srcp_below = srcp + src_linesize[plane];
  230.                 if (h == lines) srcp_above = srcp; // there is no line above
  231.                 if (h == 1) srcp_below = srcp;     // there is no line below
  232.  
  233.                 tinterlace->lowpass_line(dstp, cols, srcp, srcp_above, srcp_below);
  234.                 dstp += dstp_linesize;
  235.                 srcp += srcp_linesize;
  236.             }
  237.         } else {
  238.             av_image_copy_plane(dstp, dst_linesize[plane] * (interleave ? 2 : 1),
  239.                                 srcp, src_linesize[plane]*k, cols, lines);
  240.         }
  241.     }
  242. }
  243.  
  244. static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
  245. {
  246.     AVFilterContext *ctx = inlink->dst;
  247.     AVFilterLink *outlink = ctx->outputs[0];
  248.     TInterlaceContext *tinterlace = ctx->priv;
  249.     AVFrame *cur, *next, *out;
  250.     int field, tff, ret;
  251.  
  252.     av_frame_free(&tinterlace->cur);
  253.     tinterlace->cur  = tinterlace->next;
  254.     tinterlace->next = picref;
  255.  
  256.     cur = tinterlace->cur;
  257.     next = tinterlace->next;
  258.     /* we need at least two frames */
  259.     if (!tinterlace->cur)
  260.         return 0;
  261.  
  262.     switch (tinterlace->mode) {
  263.     case MODE_MERGE: /* move the odd frame into the upper field of the new image, even into
  264.              * the lower field, generating a double-height video at half framerate */
  265.         out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
  266.         if (!out)
  267.             return AVERROR(ENOMEM);
  268.         av_frame_copy_props(out, cur);
  269.         out->height = outlink->h;
  270.         out->interlaced_frame = 1;
  271.         out->top_field_first = 1;
  272.         out->sample_aspect_ratio = av_mul_q(cur->sample_aspect_ratio, av_make_q(2, 1));
  273.  
  274.         /* write odd frame lines into the upper field of the new frame */
  275.         copy_picture_field(tinterlace, out->data, out->linesize,
  276.                            (const uint8_t **)cur->data, cur->linesize,
  277.                            inlink->format, inlink->w, inlink->h,
  278.                            FIELD_UPPER_AND_LOWER, 1, FIELD_UPPER, tinterlace->flags);
  279.         /* write even frame lines into the lower field of the new frame */
  280.         copy_picture_field(tinterlace, out->data, out->linesize,
  281.                            (const uint8_t **)next->data, next->linesize,
  282.                            inlink->format, inlink->w, inlink->h,
  283.                            FIELD_UPPER_AND_LOWER, 1, FIELD_LOWER, tinterlace->flags);
  284.         av_frame_free(&tinterlace->next);
  285.         break;
  286.  
  287.     case MODE_DROP_ODD:  /* only output even frames, odd  frames are dropped; height unchanged, half framerate */
  288.     case MODE_DROP_EVEN: /* only output odd  frames, even frames are dropped; height unchanged, half framerate */
  289.         out = av_frame_clone(tinterlace->mode == MODE_DROP_EVEN ? cur : next);
  290.         if (!out)
  291.             return AVERROR(ENOMEM);
  292.         av_frame_free(&tinterlace->next);
  293.         break;
  294.  
  295.     case MODE_PAD: /* expand each frame to double height, but pad alternate
  296.                     * lines with black; framerate unchanged */
  297.         out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
  298.         if (!out)
  299.             return AVERROR(ENOMEM);
  300.         av_frame_copy_props(out, cur);
  301.         out->height = outlink->h;
  302.         out->sample_aspect_ratio = av_mul_q(cur->sample_aspect_ratio, av_make_q(2, 1));
  303.  
  304.         field = (1 + tinterlace->frame) & 1 ? FIELD_UPPER : FIELD_LOWER;
  305.         /* copy upper and lower fields */
  306.         copy_picture_field(tinterlace, out->data, out->linesize,
  307.                            (const uint8_t **)cur->data, cur->linesize,
  308.                            inlink->format, inlink->w, inlink->h,
  309.                            FIELD_UPPER_AND_LOWER, 1, field, tinterlace->flags);
  310.         /* pad with black the other field */
  311.         copy_picture_field(tinterlace, out->data, out->linesize,
  312.                            (const uint8_t **)tinterlace->black_data, tinterlace->black_linesize,
  313.                            inlink->format, inlink->w, inlink->h,
  314.                            FIELD_UPPER_AND_LOWER, 1, !field, tinterlace->flags);
  315.         break;
  316.  
  317.         /* interleave upper/lower lines from odd frames with lower/upper lines from even frames,
  318.          * halving the frame rate and preserving image height */
  319.     case MODE_INTERLEAVE_TOP:    /* top    field first */
  320.     case MODE_INTERLEAVE_BOTTOM: /* bottom field first */
  321.         tff = tinterlace->mode == MODE_INTERLEAVE_TOP;
  322.         out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
  323.         if (!out)
  324.             return AVERROR(ENOMEM);
  325.         av_frame_copy_props(out, cur);
  326.         out->interlaced_frame = 1;
  327.         out->top_field_first = tff;
  328.  
  329.         /* copy upper/lower field from cur */
  330.         copy_picture_field(tinterlace, out->data, out->linesize,
  331.                            (const uint8_t **)cur->data, cur->linesize,
  332.                            inlink->format, inlink->w, inlink->h,
  333.                            tff ? FIELD_UPPER : FIELD_LOWER, 1, tff ? FIELD_UPPER : FIELD_LOWER,
  334.                            tinterlace->flags);
  335.         /* copy lower/upper field from next */
  336.         copy_picture_field(tinterlace, out->data, out->linesize,
  337.                            (const uint8_t **)next->data, next->linesize,
  338.                            inlink->format, inlink->w, inlink->h,
  339.                            tff ? FIELD_LOWER : FIELD_UPPER, 1, tff ? FIELD_LOWER : FIELD_UPPER,
  340.                            tinterlace->flags);
  341.         av_frame_free(&tinterlace->next);
  342.         break;
  343.     case MODE_INTERLACEX2: /* re-interlace preserving image height, double frame rate */
  344.         /* output current frame first */
  345.         out = av_frame_clone(cur);
  346.         if (!out)
  347.             return AVERROR(ENOMEM);
  348.         out->interlaced_frame = 1;
  349.         if (cur->pts != AV_NOPTS_VALUE)
  350.             out->pts = cur->pts*2;
  351.  
  352.         out->pts = av_rescale_q(out->pts, tinterlace->preout_time_base, outlink->time_base);
  353.         if ((ret = ff_filter_frame(outlink, out)) < 0)
  354.             return ret;
  355.  
  356.         /* output mix of current and next frame */
  357.         tff = next->top_field_first;
  358.         out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
  359.         if (!out)
  360.             return AVERROR(ENOMEM);
  361.         av_frame_copy_props(out, next);
  362.         out->interlaced_frame = 1;
  363.         out->top_field_first = !tff;
  364.  
  365.         if (next->pts != AV_NOPTS_VALUE && cur->pts != AV_NOPTS_VALUE)
  366.             out->pts = cur->pts + next->pts;
  367.         else
  368.             out->pts = AV_NOPTS_VALUE;
  369.         /* write current frame second field lines into the second field of the new frame */
  370.         copy_picture_field(tinterlace, out->data, out->linesize,
  371.                            (const uint8_t **)cur->data, cur->linesize,
  372.                            inlink->format, inlink->w, inlink->h,
  373.                            tff ? FIELD_LOWER : FIELD_UPPER, 1, tff ? FIELD_LOWER : FIELD_UPPER,
  374.                            tinterlace->flags);
  375.         /* write next frame first field lines into the first field of the new frame */
  376.         copy_picture_field(tinterlace, out->data, out->linesize,
  377.                            (const uint8_t **)next->data, next->linesize,
  378.                            inlink->format, inlink->w, inlink->h,
  379.                            tff ? FIELD_UPPER : FIELD_LOWER, 1, tff ? FIELD_UPPER : FIELD_LOWER,
  380.                            tinterlace->flags);
  381.         break;
  382.     default:
  383.         av_assert0(0);
  384.     }
  385.  
  386.     out->pts = av_rescale_q(out->pts, tinterlace->preout_time_base, outlink->time_base);
  387.     ret = ff_filter_frame(outlink, out);
  388.     tinterlace->frame++;
  389.  
  390.     return ret;
  391. }
  392.  
  393. static const AVFilterPad tinterlace_inputs[] = {
  394.     {
  395.         .name         = "default",
  396.         .type         = AVMEDIA_TYPE_VIDEO,
  397.         .filter_frame = filter_frame,
  398.     },
  399.     { NULL }
  400. };
  401.  
  402. static const AVFilterPad tinterlace_outputs[] = {
  403.     {
  404.         .name         = "default",
  405.         .type         = AVMEDIA_TYPE_VIDEO,
  406.         .config_props = config_out_props,
  407.     },
  408.     { NULL }
  409. };
  410.  
  411. AVFilter ff_vf_tinterlace = {
  412.     .name          = "tinterlace",
  413.     .description   = NULL_IF_CONFIG_SMALL("Perform temporal field interlacing."),
  414.     .priv_size     = sizeof(TInterlaceContext),
  415.     .uninit        = uninit,
  416.     .query_formats = query_formats,
  417.     .inputs        = tinterlace_inputs,
  418.     .outputs       = tinterlace_outputs,
  419.     .priv_class    = &tinterlace_class,
  420. };
  421.