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https://github.com/FFmpeg/FFmpeg.git
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21f9468402
Libav, for some reason, merged this as a public API function. This will aid in future merges. A define is left for backwards compat, just in case some person used it, since it is in a public header. Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
253 lines
8.2 KiB
C
253 lines
8.2 KiB
C
/*
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* Copyright (c) 2003 Michael Zucchi <notzed@ximian.com>
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* Copyright (c) 2010 Baptiste Coudurier
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* Copyright (c) 2011 Stefano Sabatini
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* Copyright (c) 2013 Vittorio Giovara <vittorio.giovara@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/**
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* @file
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* progressive to interlaced content filter, inspired by heavy debugging of tinterlace filter
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*/
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#include "libavutil/common.h"
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#include "libavutil/opt.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/avassert.h"
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#include "formats.h"
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#include "avfilter.h"
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#include "interlace.h"
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#include "internal.h"
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#include "video.h"
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#define OFFSET(x) offsetof(InterlaceContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption interlace_options[] = {
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{ "scan", "scanning mode", OFFSET(scan),
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AV_OPT_TYPE_INT, {.i64 = MODE_TFF }, 0, 1, .flags = FLAGS, .unit = "scan" },
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{ "tff", "top field first", 0,
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AV_OPT_TYPE_CONST, {.i64 = MODE_TFF }, INT_MIN, INT_MAX, .flags = FLAGS, .unit = "scan" },
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{ "bff", "bottom field first", 0,
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AV_OPT_TYPE_CONST, {.i64 = MODE_BFF }, INT_MIN, INT_MAX, .flags = FLAGS, .unit = "scan" },
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{ "lowpass", "set vertical low-pass filter", OFFSET(lowpass),
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AV_OPT_TYPE_BOOL, {.i64 = 1 }, 0, 1, .flags = FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(interlace);
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static void lowpass_line_c(uint8_t *dstp, ptrdiff_t linesize,
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const uint8_t *srcp,
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const uint8_t *srcp_above,
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const uint8_t *srcp_below)
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{
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int i;
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for (i = 0; i < linesize; i++) {
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// this calculation is an integer representation of
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// '0.5 * current + 0.25 * above + 0.25 * below'
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// '1 +' is for rounding.
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dstp[i] = (1 + srcp[i] + srcp[i] + srcp_above[i] + srcp_below[i]) >> 2;
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}
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}
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static const enum AVPixelFormat formats_supported[] = {
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AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P,
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUVA420P,
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AV_PIX_FMT_GRAY8, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
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AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_NONE
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};
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static int query_formats(AVFilterContext *ctx)
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{
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AVFilterFormats *fmts_list = ff_make_format_list(formats_supported);
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if (!fmts_list)
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return AVERROR(ENOMEM);
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return ff_set_common_formats(ctx, fmts_list);
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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InterlaceContext *s = ctx->priv;
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av_frame_free(&s->cur);
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av_frame_free(&s->next);
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}
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static int config_out_props(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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AVFilterLink *inlink = outlink->src->inputs[0];
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InterlaceContext *s = ctx->priv;
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if (inlink->h < 2) {
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av_log(ctx, AV_LOG_ERROR, "input video height is too small\n");
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return AVERROR_INVALIDDATA;
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}
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if (!s->lowpass)
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av_log(ctx, AV_LOG_WARNING, "Lowpass filter is disabled, "
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"the resulting video will be aliased rather than interlaced.\n");
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// same input size
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outlink->w = inlink->w;
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outlink->h = inlink->h;
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outlink->time_base = inlink->time_base;
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outlink->frame_rate = inlink->frame_rate;
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// half framerate
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outlink->time_base.num *= 2;
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outlink->frame_rate.den *= 2;
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if (s->lowpass) {
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s->lowpass_line = lowpass_line_c;
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if (ARCH_X86)
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ff_interlace_init_x86(s);
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}
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av_log(ctx, AV_LOG_VERBOSE, "%s interlacing %s lowpass filter\n",
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s->scan == MODE_TFF ? "tff" : "bff", (s->lowpass) ? "with" : "without");
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return 0;
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}
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static void copy_picture_field(InterlaceContext *s,
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AVFrame *src_frame, AVFrame *dst_frame,
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AVFilterLink *inlink, enum FieldType field_type,
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int lowpass)
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{
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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int hsub = desc->log2_chroma_w;
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int vsub = desc->log2_chroma_h;
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int plane, j;
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for (plane = 0; plane < desc->nb_components; plane++) {
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int cols = (plane == 1 || plane == 2) ? -(-inlink->w) >> hsub : inlink->w;
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int lines = (plane == 1 || plane == 2) ? AV_CEIL_RSHIFT(inlink->h, vsub) : inlink->h;
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uint8_t *dstp = dst_frame->data[plane];
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const uint8_t *srcp = src_frame->data[plane];
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av_assert0(cols >= 0 || lines >= 0);
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lines = (lines + (field_type == FIELD_UPPER)) / 2;
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if (field_type == FIELD_LOWER) {
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srcp += src_frame->linesize[plane];
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dstp += dst_frame->linesize[plane];
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}
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if (lowpass) {
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int srcp_linesize = src_frame->linesize[plane] * 2;
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int dstp_linesize = dst_frame->linesize[plane] * 2;
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for (j = lines; j > 0; j--) {
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const uint8_t *srcp_above = srcp - src_frame->linesize[plane];
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const uint8_t *srcp_below = srcp + src_frame->linesize[plane];
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if (j == lines)
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srcp_above = srcp; // there is no line above
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if (j == 1)
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srcp_below = srcp; // there is no line below
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s->lowpass_line(dstp, cols, srcp, srcp_above, srcp_below);
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dstp += dstp_linesize;
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srcp += srcp_linesize;
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}
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} else {
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av_image_copy_plane(dstp, dst_frame->linesize[plane] * 2,
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srcp, src_frame->linesize[plane] * 2,
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cols, lines);
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}
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}
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
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{
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AVFilterContext *ctx = inlink->dst;
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AVFilterLink *outlink = ctx->outputs[0];
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InterlaceContext *s = ctx->priv;
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AVFrame *out;
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int tff, ret;
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av_frame_free(&s->cur);
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s->cur = s->next;
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s->next = buf;
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/* we need at least two frames */
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if (!s->cur || !s->next)
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return 0;
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if (s->cur->interlaced_frame) {
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av_log(ctx, AV_LOG_WARNING,
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"video is already interlaced, adjusting framerate only\n");
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out = av_frame_clone(s->cur);
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if (!out)
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return AVERROR(ENOMEM);
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out->pts /= 2; // adjust pts to new framerate
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ret = ff_filter_frame(outlink, out);
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return ret;
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}
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tff = (s->scan == MODE_TFF);
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!out)
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return AVERROR(ENOMEM);
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av_frame_copy_props(out, s->cur);
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out->interlaced_frame = 1;
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out->top_field_first = tff;
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out->pts /= 2; // adjust pts to new framerate
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/* copy upper/lower field from cur */
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copy_picture_field(s, s->cur, out, inlink, tff ? FIELD_UPPER : FIELD_LOWER, s->lowpass);
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av_frame_free(&s->cur);
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/* copy lower/upper field from next */
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copy_picture_field(s, s->next, out, inlink, tff ? FIELD_LOWER : FIELD_UPPER, s->lowpass);
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av_frame_free(&s->next);
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ret = ff_filter_frame(outlink, out);
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return ret;
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}
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static const AVFilterPad inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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},
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{ NULL }
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};
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static const AVFilterPad outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_out_props,
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},
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{ NULL }
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};
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AVFilter ff_vf_interlace = {
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.name = "interlace",
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.description = NULL_IF_CONFIG_SMALL("Convert progressive video into interlaced."),
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.uninit = uninit,
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.priv_class = &interlace_class,
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.priv_size = sizeof(InterlaceContext),
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.query_formats = query_formats,
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.inputs = inputs,
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.outputs = outputs,
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};
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