diff options
Diffstat (limited to 'libavfilter/vf_kerndeint.c')
-rw-r--r-- | libavfilter/vf_kerndeint.c | 318 |
1 files changed, 318 insertions, 0 deletions
diff --git a/libavfilter/vf_kerndeint.c b/libavfilter/vf_kerndeint.c new file mode 100644 index 0000000..1158fdb --- /dev/null +++ b/libavfilter/vf_kerndeint.c @@ -0,0 +1,318 @@ +/* + * Copyright (c) 2012 Jeremy Tran + * Copyright (c) 2004 Tobias Diedrich + * Copyright (c) 2003 Donald A. Graft + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with FFmpeg; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +/** + * @file + * Kernel Deinterlacer + * Ported from MPlayer libmpcodecs/vf_kerndeint.c. + */ + +#include "libavutil/imgutils.h" +#include "libavutil/intreadwrite.h" +#include "libavutil/opt.h" +#include "libavutil/pixdesc.h" + +#include "avfilter.h" +#include "formats.h" +#include "internal.h" + +typedef struct { + const AVClass *class; + int frame; ///< frame count, starting from 0 + int thresh, map, order, sharp, twoway; + int vsub; + int is_packed_rgb; + uint8_t *tmp_data [4]; ///< temporary plane data buffer + int tmp_linesize[4]; ///< temporary plane byte linesize + int tmp_bwidth [4]; ///< temporary plane byte width +} KerndeintContext; + +#define OFFSET(x) offsetof(KerndeintContext, x) +#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM +static const AVOption kerndeint_options[] = { + { "thresh", "set the threshold", OFFSET(thresh), AV_OPT_TYPE_INT, {.i64=10}, 0, 255, FLAGS }, + { "map", "set the map", OFFSET(map), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS }, + { "order", "set the order", OFFSET(order), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS }, + { "sharp", "enable sharpening", OFFSET(sharp), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS }, + { "twoway", "enable twoway", OFFSET(twoway), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS }, + { NULL } +}; + +AVFILTER_DEFINE_CLASS(kerndeint); + +static av_cold void uninit(AVFilterContext *ctx) +{ + KerndeintContext *kerndeint = ctx->priv; + + av_freep(&kerndeint->tmp_data[0]); +} + +static int query_formats(AVFilterContext *ctx) +{ + static const enum AVPixelFormat pix_fmts[] = { + AV_PIX_FMT_YUV420P, + AV_PIX_FMT_YUYV422, + AV_PIX_FMT_ARGB, AV_PIX_FMT_0RGB, + AV_PIX_FMT_ABGR, AV_PIX_FMT_0BGR, + AV_PIX_FMT_RGBA, AV_PIX_FMT_RGB0, + AV_PIX_FMT_BGRA, AV_PIX_FMT_BGR0, + AV_PIX_FMT_NONE + }; + + ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); + + return 0; +} + +static int config_props(AVFilterLink *inlink) +{ + KerndeintContext *kerndeint = inlink->dst->priv; + const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); + int ret; + + kerndeint->is_packed_rgb = av_pix_fmt_desc_get(inlink->format)->flags & AV_PIX_FMT_FLAG_RGB; + kerndeint->vsub = desc->log2_chroma_h; + + ret = av_image_alloc(kerndeint->tmp_data, kerndeint->tmp_linesize, + inlink->w, inlink->h, inlink->format, 16); + if (ret < 0) + return ret; + memset(kerndeint->tmp_data[0], 0, ret); + + if ((ret = av_image_fill_linesizes(kerndeint->tmp_bwidth, inlink->format, inlink->w)) < 0) + return ret; + + return 0; +} + +static int filter_frame(AVFilterLink *inlink, AVFrame *inpic) +{ + KerndeintContext *kerndeint = inlink->dst->priv; + AVFilterLink *outlink = inlink->dst->outputs[0]; + AVFrame *outpic; + const uint8_t *prvp; ///< Previous field's pixel line number n + const uint8_t *prvpp; ///< Previous field's pixel line number (n - 1) + const uint8_t *prvpn; ///< Previous field's pixel line number (n + 1) + const uint8_t *prvppp; ///< Previous field's pixel line number (n - 2) + const uint8_t *prvpnn; ///< Previous field's pixel line number (n + 2) + const uint8_t *prvp4p; ///< Previous field's pixel line number (n - 4) + const uint8_t *prvp4n; ///< Previous field's pixel line number (n + 4) + + const uint8_t *srcp; ///< Current field's pixel line number n + const uint8_t *srcpp; ///< Current field's pixel line number (n - 1) + const uint8_t *srcpn; ///< Current field's pixel line number (n + 1) + const uint8_t *srcppp; ///< Current field's pixel line number (n - 2) + const uint8_t *srcpnn; ///< Current field's pixel line number (n + 2) + const uint8_t *srcp3p; ///< Current field's pixel line number (n - 3) + const uint8_t *srcp3n; ///< Current field's pixel line number (n + 3) + const uint8_t *srcp4p; ///< Current field's pixel line number (n - 4) + const uint8_t *srcp4n; ///< Current field's pixel line number (n + 4) + + uint8_t *dstp, *dstp_saved; + const uint8_t *srcp_saved; + + int src_linesize, psrc_linesize, dst_linesize, bwidth; + int x, y, plane, val, hi, lo, g, h, n = kerndeint->frame++; + double valf; + + const int thresh = kerndeint->thresh; + const int order = kerndeint->order; + const int map = kerndeint->map; + const int sharp = kerndeint->sharp; + const int twoway = kerndeint->twoway; + + const int is_packed_rgb = kerndeint->is_packed_rgb; + + outpic = ff_get_video_buffer(outlink, outlink->w, outlink->h); + if (!outpic) { + av_frame_free(&inpic); + return AVERROR(ENOMEM); + } + av_frame_copy_props(outpic, inpic); + outpic->interlaced_frame = 0; + + for (plane = 0; plane < 4 && inpic->data[plane] && inpic->linesize[plane]; plane++) { + h = plane == 0 ? inlink->h : FF_CEIL_RSHIFT(inlink->h, kerndeint->vsub); + bwidth = kerndeint->tmp_bwidth[plane]; + + srcp_saved = inpic->data[plane]; + src_linesize = inpic->linesize[plane]; + psrc_linesize = kerndeint->tmp_linesize[plane]; + dstp_saved = outpic->data[plane]; + dst_linesize = outpic->linesize[plane]; + srcp = srcp_saved + (1 - order) * src_linesize; + dstp = dstp_saved + (1 - order) * dst_linesize; + + for (y = 0; y < h; y += 2) { + memcpy(dstp, srcp, bwidth); + srcp += 2 * src_linesize; + dstp += 2 * dst_linesize; + } + + // Copy through the lines that will be missed below. + memcpy(dstp_saved + order * dst_linesize, srcp_saved + (1 - order) * src_linesize, bwidth); + memcpy(dstp_saved + (2 + order ) * dst_linesize, srcp_saved + (3 - order) * src_linesize, bwidth); + memcpy(dstp_saved + (h - 2 + order) * dst_linesize, srcp_saved + (h - 1 - order) * src_linesize, bwidth); + memcpy(dstp_saved + (h - 4 + order) * dst_linesize, srcp_saved + (h - 3 - order) * src_linesize, bwidth); + + /* For the other field choose adaptively between using the previous field + or the interpolant from the current field. */ + prvp = kerndeint->tmp_data[plane] + 5 * psrc_linesize - (1 - order) * psrc_linesize; + prvpp = prvp - psrc_linesize; + prvppp = prvp - 2 * psrc_linesize; + prvp4p = prvp - 4 * psrc_linesize; + prvpn = prvp + psrc_linesize; + prvpnn = prvp + 2 * psrc_linesize; + prvp4n = prvp + 4 * psrc_linesize; + + srcp = srcp_saved + 5 * src_linesize - (1 - order) * src_linesize; + srcpp = srcp - src_linesize; + srcppp = srcp - 2 * src_linesize; + srcp3p = srcp - 3 * src_linesize; + srcp4p = srcp - 4 * src_linesize; + + srcpn = srcp + src_linesize; + srcpnn = srcp + 2 * src_linesize; + srcp3n = srcp + 3 * src_linesize; + srcp4n = srcp + 4 * src_linesize; + + dstp = dstp_saved + 5 * dst_linesize - (1 - order) * dst_linesize; + + for (y = 5 - (1 - order); y <= h - 5 - (1 - order); y += 2) { + for (x = 0; x < bwidth; x++) { + if (thresh == 0 || n == 0 || + (abs((int)prvp[x] - (int)srcp[x]) > thresh) || + (abs((int)prvpp[x] - (int)srcpp[x]) > thresh) || + (abs((int)prvpn[x] - (int)srcpn[x]) > thresh)) { + if (map) { + g = x & ~3; + + if (is_packed_rgb) { + AV_WB32(dstp + g, 0xffffffff); + x = g + 3; + } else if (inlink->format == AV_PIX_FMT_YUYV422) { + // y <- 235, u <- 128, y <- 235, v <- 128 + AV_WB32(dstp + g, 0xeb80eb80); + x = g + 3; + } else { + dstp[x] = plane == 0 ? 235 : 128; + } + } else { + if (is_packed_rgb) { + hi = 255; + lo = 0; + } else if (inlink->format == AV_PIX_FMT_YUYV422) { + hi = x & 1 ? 240 : 235; + lo = 16; + } else { + hi = plane == 0 ? 235 : 240; + lo = 16; + } + + if (sharp) { + if (twoway) { + valf = + 0.526 * ((int)srcpp[x] + (int)srcpn[x]) + + 0.170 * ((int)srcp[x] + (int)prvp[x]) + - 0.116 * ((int)srcppp[x] + (int)srcpnn[x] + (int)prvppp[x] + (int)prvpnn[x]) + - 0.026 * ((int)srcp3p[x] + (int)srcp3n[x]) + + 0.031 * ((int)srcp4p[x] + (int)srcp4n[x] + (int)prvp4p[x] + (int)prvp4n[x]); + } else { + valf = + 0.526 * ((int)srcpp[x] + (int)srcpn[x]) + + 0.170 * ((int)prvp[x]) + - 0.116 * ((int)prvppp[x] + (int)prvpnn[x]) + - 0.026 * ((int)srcp3p[x] + (int)srcp3n[x]) + + 0.031 * ((int)prvp4p[x] + (int)prvp4p[x]); + } + dstp[x] = av_clip(valf, lo, hi); + } else { + if (twoway) { + val = (8 * ((int)srcpp[x] + (int)srcpn[x]) + 2 * ((int)srcp[x] + (int)prvp[x]) + - (int)(srcppp[x]) - (int)(srcpnn[x]) + - (int)(prvppp[x]) - (int)(prvpnn[x])) >> 4; + } else { + val = (8 * ((int)srcpp[x] + (int)srcpn[x]) + 2 * ((int)prvp[x]) + - (int)(prvppp[x]) - (int)(prvpnn[x])) >> 4; + } + dstp[x] = av_clip(val, lo, hi); + } + } + } else { + dstp[x] = srcp[x]; + } + } + prvp += 2 * psrc_linesize; + prvpp += 2 * psrc_linesize; + prvppp += 2 * psrc_linesize; + prvpn += 2 * psrc_linesize; + prvpnn += 2 * psrc_linesize; + prvp4p += 2 * psrc_linesize; + prvp4n += 2 * psrc_linesize; + srcp += 2 * src_linesize; + srcpp += 2 * src_linesize; + srcppp += 2 * src_linesize; + srcp3p += 2 * src_linesize; + srcp4p += 2 * src_linesize; + srcpn += 2 * src_linesize; + srcpnn += 2 * src_linesize; + srcp3n += 2 * src_linesize; + srcp4n += 2 * src_linesize; + dstp += 2 * dst_linesize; + } + + srcp = inpic->data[plane]; + dstp = kerndeint->tmp_data[plane]; + av_image_copy_plane(dstp, psrc_linesize, srcp, src_linesize, bwidth, h); + } + + av_frame_free(&inpic); + return ff_filter_frame(outlink, outpic); +} + +static const AVFilterPad kerndeint_inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .filter_frame = filter_frame, + .config_props = config_props, + }, + { NULL } +}; + +static const AVFilterPad kerndeint_outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + }, + { NULL } +}; + + +AVFilter ff_vf_kerndeint = { + .name = "kerndeint", + .description = NULL_IF_CONFIG_SMALL("Apply kernel deinterlacing to the input."), + .priv_size = sizeof(KerndeintContext), + .priv_class = &kerndeint_class, + .uninit = uninit, + .query_formats = query_formats, + .inputs = kerndeint_inputs, + .outputs = kerndeint_outputs, +}; |